Updated on 2024/03/27

写真a

 
YAMAMOTO Masayoshi
 
Organization
Institute of Materials and Systems for Sustainability Center for Integrated Research of Future Electronics Division Professor
Graduate School
Graduate School of Engineering
Title
Professor
Contact information
メールアドレス
Profile
Masayoshi Yamamoto (M’11) received his M.S. and Ph.D. degree in science and engineering from Yamaguchi University, Yamaguchi, Japan in 2000 and 2004 respectively. From 2004 to 2005, he was with Sanken Electric Co., Ltd., Saitama, Japan. From 2006 to 2017, he was with the Interdisciplinary Faculty of Science and Engineering in Shimane University, Japan, as an Associate Professor. He is currently a Professor at Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Japan. His research interests include power supply for HEV (boost converter, buck converter, 3-phase inverter, digital control), charging system for EV, LED illumination system for a tunnel, EMI of switching power supply, and wireless power transfer.
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Degree 1

  1. Ph.D. (Engineering) ( 2004.3   Yamaguchi University ) 

Research Interests 2

  1. Power Electronics

  2. パワーエレクトロニクス

Research Areas 2

  1. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering  / Power Electronics

  2. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering

Current Research Project and SDGs 1

  1. 次世代航空機の電動化に関する研究

Research History 6

  1. Nagoya University   Professor

    2017.5

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    Country:Japan

  2. Nagoya University

    2016.12 - 2017.4

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    Country:Japan

  3. Shimane University   Associate professor

    2011.4 - 2017.4

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    Country:Japan

  4. Shimane University   Lecturer

    2006.4 - 2011.3

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    Country:Japan

  5. サンケン電気株式会社

    2004.4 - 2006.3

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    Country:Japan

  6. Shimane University Interdisciplinary Faculty of Science and Engineering, Department of Electronic and Control Systems Engineering

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Education 1

  1. Yamaguchi University   Graduate School, Division of Science and Engineering

    - 2003

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    Country: Japan

Professional Memberships 26

  1. 次世代のスイッチング方式電源システム産学委員会   幹事委員

    2023.4

  2. 電気自動車用パワーコントロールユニット高性能化に関する調査委員会   委員長

    2019.4

  3. IEEE

  4. 電気学会

  5. 自動車技術会

  6. パワーエレクトロニクス学会

  7. 電子情報通信学会

  8. 中国支部役員会・電気学会

  9. ワイヤレス電力伝送システムにおける電力変換技術協同研究委員会

  10. 交流電源にインタフェースされるパワーエレクトロニクス回路技術調査専門委員会

  11. 新材料半導体パワーデバイスとその利用に関する技術協同研究委員会

  12. 新材料パワー半導体の変換器応用に関する技術協同研究委員会

  13. 平成26年電子・情報・システム部門大会実行委員会

  14. 平成26年電子・情報・システム部門大会委員会

  15. 平成28・29年度学会活動推進員〔中国支部〕

  16. 平成26・27年度学会活動推進員〔中国支部〕 ・電気学会

  17. 平成24年全国大会実行委員会

  18. 島根県パワーエレクトロニクス研究会

  19. 商用電源にインターフェイスされる電力変換システム技術調査専門委員会・電気学会

  20. 交流電源インターフェイス用コンバータ技術調査専門委員会 ・電気学会

  21. 論文委員会(D1グループ) ・電気学会

  22. 自動車用パワーエレクトロニクスの適用調査専門委員会

  23. 自動車用パワーエレクトロニクスの新展開調査専門委員会

  24. 自動車用パワーエレクトロニクスの拡大調査専門委員会

  25. IPEC2014論文委員会

  26. IPEC2018組織委員会

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Committee Memberships 24

  1. サイバー・フィジカル・エンジニアリング技術研究組合   CTデータ利活用技術検討委員会  

    2023.6 - 2025.3   

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    Committee type:Other

  2. 公益財団法人スズキ財団   審査委員  

    2023.5 - 2026.3   

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    Committee type:Other

  3. 次世代のスイッチング方式電源システム産学委員会   幹事委員  

    2023.4   

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    Committee type:Academic society

  4. 山口県自動車産業イノベーション推進が異議   特別顧問(技術顧問)  

    2023.4 - 2024.3   

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    Committee type:Municipal

  5. 2023年電気学会産業応用部門大会実行委員会   委員  

    2022.8 - 2023.12   

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    Committee type:Academic society

  6. 論文委員会(D6グループ)   委員  

    2020.1   

  7. 選挙管理委員会   委員  

    2019.10 - 2021.6   

  8. 総務会議   委員 東海 総務担当  

    2019.5 - 2020.6   

  9. 電動車両のパワーコントロールユニットの高性能化に関する協同研究委員会   委員長  

    2019.4   

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    Committee type:Academic society

  10. ICEMS2020実行委員会   委員  

    2019.4 - 2021.3   

  11. 広報委員会   委員  

    2018.6 - 2019.5   

  12. 編修専門第3部会   委員  

    2018.5 - 2020.6   

  13. 東海支部役員会   総務企画幹事  

    2018.5 - 2020.6   

  14. SiCとGaNと共に発展するパワーエレクトロニクスにおけるシステムインテグレーション技術調査   委員  

    2018.4 - 2021.3   

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    Committee type:Academic society

  15. 交流電源にインタフェースされる電力変換回路および制御技術調査専門委員会   幹事  

    2018.4 - 2020.3   

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    Committee type:Academic society

  16. 平成30・31年度学会活動推進員〔東海支部〕   総務企画幹事  

    2018.4 - 2020.3   

  17. 日本学術振興会 産学協力研究委員会   副委員長  

    2016.10   

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    Committee type:Academic society

  18. 日本学術振興会 産学協力研究委員会(次世代のスイッチング方式電源システム第173委員会)   副委員長  

    2016.10 - 2022.3   

  19. 平成28・29年度学会活動推進員〔中国支部〕   推進員(学校)  

    2016 - 2018   

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    Committee type:Academic society

    平成28・29年度学会活動推進員〔中国支部〕

  20. IPEC2018組織委員会   委員  

    2015.12 - 2019.3   

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    Committee type:Academic society

  21. IPEC2018組織委員会   委員  

    2015 - 2019   

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    Committee type:Academic society

    IPEC2018組織委員会

  22. 自動車用パワーエレクトロニクスの新展開調査専門委員会   委員  

    2015 - 2017   

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    Committee type:Academic society

    自動車用パワーエレクトロニクスの新展開調査専門委員会

  23. 新材料パワー半導体の変換器応用に関する技術協同研究委員会   委員長  

    2015 - 2017   

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    Committee type:Academic society

    新材料パワー半導体の変換器応用に関する技術協同研究委員会

  24. 電気学会半導体電力変換技術委員会   1号委員  

    2014.1   

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    Committee type:Academic society

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Awards 14

  1. In appreciation for an outstanding presentation, APEC 2024 acknowledges

    2024.2   IEEE   Analysis of Eddy Currents and Thermal Modeling of Planar Magnetic Components with Metal Housing

    Atsushi Hasenuma

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    Award type:Award from international society, conference, symposium, etc.  Country:United States

    IEEE Applied Power Electronics Conference and Exposition

  2. 2022 IEEE Energy Conversion Congress and Exposition Third Prize Paper Award

    2023.10   IEEE INDUSTRY APPLICATIONS SOCIETY   Feasible Evaluations of Low Profile Magnetic Structure Based on Meander Winding and Split-magnetic Cores with High-Cooling Capability Used in Power Converters

    Jun Imaoka Masayoshi Yamamoto Koichi Shigematsu Mostafa Noah

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    Award type:Award from international society, conference, symposium, etc.  Country:United States

  3. IEICE Best Paper Award

    2023.6   13.56MHz Half-Bridge GaN-HEMT Resonant Inverter Achieving High Power, Low Distortion, and High Efficiency by ‘L-S Network’

    OYANE AOI ・THILAK SENANAYAKE ・IMAOKA JUN ・YAMAMOTO MASAYOSHI

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    Country:Japan

  4. 講演大会優秀賞

    2024.3   一般社団法人 エレクトロニクス実装学会   パワー半導体基板内蔵技術によるSiCハーフブリッジ回路の設計・試作・評価

    中村和人・今岡淳・山本真義

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  5. 若手エンジニア論文発表賞

    2024.1   一般社団法人電気電子情報通信学会 通信ソサイエティ   統合トランスを用いたAC-DCインターリーブフライバックコンバータ

    平沢開

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  6. 若手エンジニア論文発表賞

    2024.1   一般社団法人電気電子情報通信学会 通信ソサイエティ  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  7. 電気学会全国大会功労賞

    2023.3   一般社団法人電気学会  

    山本真義

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  8. EEJ Technical Committee Encouragement Award

    2023.1   Application of Balance Technique to Two-Phase Interleaved Boost Converters with Coupled Inductor for Common-Mode Noise Reduction

    Tomotaka Nagai

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  9. 電気学会優秀論文発表賞

    2023.1   電気学会東海支部   フルブリッジLLCコンバータへの回路平衡化適用による部品増加を伴わないコモンモードノイズ抑制手法

    永井友崇

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  10. 論文賞

    2022.9   電子情報通信学会   13.56MHz Half-Bridge Gan-HEMT Rsonant Inverter Achiving High Power, low Distortion, and High Efficiency by 'L-S Network'

    大矢根蒼・Thilak SENANAYAKE・増田満・今岡淳・山本真義

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  11. 産業応用部門 論文査読推進賞

    2022.8   電気学会 産業応用部門  

    山本真義

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    Country:Japan

  12. 優秀論文発表賞

    2022.2   電気学会 半導体電力変換研究会   直流ブラシモータにおけるスパイクサージ の分析と解析モデルの提案

    片桐高大

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  13. 電気学会優秀論文発表賞

    2022.1   電気学会  

    塩山 知

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  14. 第16回WPT研コンテスト 優秀賞

    2020.11   WPT研究会   電界&磁界ハイブリッド結合!!反射波も利用できる 走れ!オメガ・ヴィークル

    蔵本 大樹、大矢 根蒼、大野 広道、山本 真義様

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    Country:Japan

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Papers 164

  1. Voltage-Controlled Variable Inductor for Fixed-Frequency Critical Conduction Mode Operation Reviewed

    Choi S., Shin J.W., Imaoka J., Yamamoto M.

    IEEE Transactions on Industrial Electronics   Vol. 70 ( 6 ) page: 5707 - 5716   2023.6

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    Authorship:Corresponding author   Language:English   Publisher:IEEE Transactions on Industrial Electronics  

    This article proposes a novel voltage-controlled variable inductor (VI) for fixing the switching frequency of dc-dc converters in the critical conduction mode (CRM). It overcomes the limitations of conventional current-controlled VIs such as complex winding structures, difficulties in control, and high sensitivity to temperature. In the proposed voltage-controlled VI, the primary side inductance of a coupled inductor is regulated by an auxiliary voltage source on the secondary side. The auxiliary voltage source is implemented by an auxiliary dc-dc converter, which delivers power to the load in parallel with the main converter. The operating principle of the converter system for employing the proposed VI is presented, and a control loop is designed to fix the switching frequency, considering the small-signal model of the auxiliary converter. The validity of the proposed VI is experimentally verified using a prototype CRM boost converter with an output voltage of 400 V and a maximum power of 400 W. The switching frequency is fixed at 100 kHz and the soft switching of the main converter is maintained regardless of the input voltage and output power.

    DOI: 10.1109/TIE.2022.3198235

    Scopus

  2. A simple gate driver design for GaN-based switching devices with improved surge voltage and switching loss at 1 MHz operation Reviewed International coauthorship International journal

    Jodo Shota, Iwaki Toshihiro, Uchiyama Kosuke, Islam Md. Zahidul, Kataoka Kensuke, Hayakasa Yuki, Imaoka Jun, Yamamoto Masayoshi, Niitsu Kiichi

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 60 ( SA )   2021.1

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    Authorship:Last author   Language:English  

    Web of Science

  3. Current and Voltage Hybrid Source Gate Driver for Maximizing the Switching Capability of SiC MOSFETs Reviewed International journal

    Ishido Ryosuke, Okawauchi Yuta, Nakahara Ken, Shirai Shinya, Yamamoto Masayoshi

    2020 IEEE WORKSHOP ON WIDE BANDGAP POWER DEVICES AND APPLICATIONS IN ASIA (WIPDA ASIA)     2020

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    Authorship:Last author   Language:English  

    DOI: 10.1109/WiPDAAsia49671.2020.9360286

    Web of Science

  4. Improved core loss calculation method considering the non-uniform distribution of magnetic flux density in powder cores Reviewed International coauthorship International journal

    Ishikura Yuki, Imaoka Jun, Noah Mostafa, Yamamoto Masayoshi

    IET POWER ELECTRONICS   Vol. 12 ( 6 ) page: 1393 - 1399   2019.5

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    Authorship:Last author   Language:English  

    DOI: 10.1049/iet-pel.2018.5362

    Web of Science

  5. Analytical Model of Maximum Operating Frequency of Class-D ZVS inverter with Linearized Parasitic Capacitance and Any Duty Ratio Invited Reviewed

    Y. Xiong, S. Thilak, Y. Yonezawa, J. Imaoka, and M. Yamamoto

    IEICE Tran     2024.8

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transfun.2023EAP1081

  6. Efficient Multiphysics Circuit Simulation for Transformer Optimization Using Hybrid Dowell Artificial Neural Network Reviewed International coauthorship International journal

    Wu Yu-Hsin, Shigematsu Koichi, Omoto Yasumichi, Ikushima Yoshihiro, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. advpub ( 0 )   2024

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>This paper introduces a practical approach for transformer design optimization using a novel hybrid Dowell artificial neural network (HDANN) model. This model is a highly efficient and accurate method to estimate leakage inductance, which is an important parameter that affects the performance of transformers and power converters. The model combines the conventional hybrid Dowell’s model, which uses analytical equations, and an artificial neural network, which uses machine learning techniques. It is integrated into an optimization program to optimize the design of a transformer in terms of its size and loss. We investigated the HDANN design scope by testing various transformer conditions. The results provided an in depth understanding of the capabilities and limitations of the HDANN model for transformer design. By understanding the HDANN design scope, the optimization program was implemented in a multidomain circuit simulation, which includes electric and magnetic circuits. This allows a high-speed co-simulation using the optimized transformer design that considers the geometry and material characteristics for the desired circuit specification. It showed that the HDANN offers significant advantages over existing design optimization methods, including improved ease of application, accuracy, and efficiency. The effectiveness of the optimization using the HDANN with the defined geometric parameters was demonstrated by the circuit analysis results of a phase-shift full-bridge converter. Summarizing, the proposed method can potentially revolutionize how transformers are designed and implemented for various applications, leading to increased design reliability as well as reduced power loss and size.</p>

    DOI: 10.1541/ieejjia.23009691

    CiNii Research

  7. Efficient Multi-physics Circuit Simulation with Transformer Optimization Using Hybrid Dowell Artificial Neural Network Reviewed International coauthorship

    Y. -H. Wu, K. Shigematsu, Y. Omoto, Y. Ikushima, J. Imaoka and M. Yamamoto

    IEEJ Journal of Industry Applications   Vol. 13 ( 3 )   2024

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  8. Conducted EMI Simulation for a DC-DC Converter : a DC Brush Motor System Considering Showering Arc at Mechanical Contacts Reviewed

    Kodai Katagiri, Toru Ogawa, Masayoshi Yamamoto, Jun Imaoka, Mamoru Sasaki

    IEEJ Journal of Industry Applications   Vol. 12 ( 5 ) page: 933 - 944   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)  

  9. Balanced Two-phase Interleaved Boost Converter with Integrated Magnetics for Common-Mode Noise Reduction Reviewed

    Tomotaka Nagai, Mamoru Sasaki, Jun Imaoka, Masayoshi Yamamoto, Akira Nakano

    IEEJ Journal of Industry Applications   Vol. 12 ( 4 ) page: 664 - 675   2023.7

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    Language:English   Publishing type:Research paper (scientific journal)  

  10. Voltage-Controlled Variable Inductor for Fixed-Frequency Critical Conduction Mode Operation Reviewed

    Sihoon Choi, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

    IEEE Transactions on Industrial Electronics   Vol. 70 ( 6 ) page: 5707 - 5716   2023.6

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  11. Common mode conductive noise cancellation formultiphase converter using auxiliary winding Reviewed

    Electrical Engineering in Japan   Vol. 143 ( 4 ) page: 263 - 272   2023.6

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    Language:English   Publishing type:Research paper (scientific journal)  

  12. Accurate Leakage Inductance Modeling Using Artificial Neural Network (ANN) Based on Dowell Model Reviewed International coauthorship

    Yu-Hsin Wu, Koichi Shigematsu, Yasumichi Omoto, Jun Imaoka, Masayoshi Yamamoto

    IEEJ Journal of Industry Applications   Vol. 12 ( 3 ) page: 334 - 344   2023.5

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  13. Derivation of Resonant Period for Soft Switching Considering Nonlinear Characteristics of Output Capacitance in Switching Device Reviewed

    Sihoon Choi, Ayato Suzuki, Jun Imaoka, Masayoshi Yamamoto

    IEEJ Journal of Industry Applications   Vol. 70 ( 6 ) page: 289 - 294   2023.5

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  14. Investigation on Relationship between Common Mode Noise and Distribution of Parasitic Capacitance Reviewed

    Mamoru Sasaki, Jun Imaoka, Masayoshi Yamamoto

    IEEJ Journal of Industry Applications   Vol. 12 ( 3 ) page: 484 - 492   2023.5

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  15. Current Sharing Control of Multi-Input Modular DC-DC Converter Using Unregulated LLC Resonant Converter Reviewed International journal

    Piao Qingyun, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Transactions on Industry Applications   Vol. 143 ( 4 ) page: 337 - 348   2023.4

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    Authorship:Last author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>By applying an unregulated LLC resonant converter to a multi-input modular DC-DC converter (MIMC), the LLC converter can be operated at an optimal frequency while achieving power source flexibility. However, the output characteristics of an LLC converter are easily affected by the resonance parameter, and when connected in parallel, the output current is unbalanced. In this paper, we propose a current sharing control method to solve the current imbalance problem, and automatically balance the output current of each module. The effectiveness of the proposed current sharing control method is verified by simulations and experiments.</p>

    DOI: 10.1541/ieejias.143.337

    Scopus

    CiNii Research

  16. Common Mode Conductive Noise Cancellation for Multiphase Converter Using Auxiliary Winding Reviewed International journal

    Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi, Nakano Akira, Fuse Koji

    IEEJ Transactions on Industry Applications   Vol. 143 ( 4 ) page: 263 - 272   2023.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>A multiphase DC-DC converter consisting of a coupled inductor and fast switching devices enables power electronics equipment to achieve a high power density. However, with such devices, the fast voltage transition generates substantial common mode (CM) noise. However, there are very few studies on CM noise reduction for multiphase converters using a coupled inductor. Therefore, in this paper, a CM noise reduction method is proposed for a multiphase DC-DC converter that hardly lowers the power density.</p>

    DOI: 10.1541/ieejias.143.263

    Scopus

    CiNii Research

  17. 補助巻き線による結合インダクタ方式多相コンバータ用コモンモードノイズキャンセル Invited Reviewed

    佐々木 守, 今岡 淳, 山本 真義

    電気学会論文誌D     2023.4

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    Authorship:Corresponding author   Language:Japanese  

  18. 非制御 LLC共振形コンバータを用いたモジュラーDC-DCコンバータの電流分担制御 Reviewed

    朴 青云, 今岡 淳, 山本真義

    電気学会論文誌D   Vol. 143 ( 4 ) page: 337 - 348   2023.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  19. Gate Drive Circuit Suitable for a GaN Gate Injection Transistor Reviewed

    Fumiya Hattori, Yuta Yanagisawa, Jun Imaoka, Masayoshi Yamamoto

    IEEE Access   Vol. 12 ( 3 ) page: 43169 - 43182   2023.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

  20. 補助巻き線による結合インダクタ方式多相コンバータ用コモンモードノイズキャンセル Invited Reviewed International journal

    佐々木 守, 今岡 淳, 山本 真義, 仲野 陽, 布施 浩司

    電気学会論文誌D   Vol. 143 ( 4 ) page: 263 - 272   2023.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:電気学会論文誌D  

  21. Novel measurement method to determine optimum reception frequency of electric field wireless power receiver Invited Reviewed

    A. Oyane and M. Yamamoto

    IEEJ Journal of Industry Applications   Vol. 12 ( 1 ) page: 54 - 64   2023.1

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    Authorship:Corresponding author   Language:English  

  22. Spike Surge and Conducted EMI Simulation of DC Brush Motor Considering Steady Arc at Mechanical Contacts Invited Reviewed

    IEEJ Journal of Industry Applications   Vol. 12 ( 1 ) page: 86 - 93   2023

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    Authorship:Corresponding author   Language:English  

  23. Novel Measurement Method to Determine Optimum Reception Frequency of Electric Field Wireless Power Receiver Reviewed International journal

    Oyane Aoi, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. 12 ( 1 ) page: 54 - 64   2023

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    <p>This paper proposes a novel method for measuring the characteristics of a wireless power receiver of an electric field wireless power transfer (eWPT) system. The proposed measurement method allows us to obtain the frequency response of the eWPT receiver's power-receiving characteristics with respect to the spatial electric field frequency. Conventionally, it was not possible to measure the reception characteristics of a single independent receiver. This is because a resonant eWPT transmitter has pronounced frequency dependent characteristics. As a result, frequency-dependent electric fields are emitted into space and act on the receiver. The proposed measurement method overcomes this obstacle by using the proposed device that generates a high-frequency electric field almost independently of the frequency. The proposed device generates high-frequency electric fields in space by using a terminating resistor instead of resonator circuits. Therefore, unlike resonant transmitters, the strength of the electric field generated by the proposed device does not exhibit a large frequency dependence. The proposed measurement method will also be useful for the prototyping, evaluation, and optimization of new advanced eWPT systems whose characteristics are not yet fully understood. Here, 85kHz series resonant eWPT receivers are evaluated using the proposed measurement method, and the details of this experimental device are also described.</p>

    DOI: 10.1541/ieejjia.22004096

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  24. Accurate Leakage Inductance Modeling Using an Artificial Neural Network Based on the Dowell Model Reviewed

    Wu Yu-Hsin, Shigematsu Koichi, Omoto Yasumichi, Ikushima Yoshihiro, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. advpub ( 0 )   2023

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    <p>This study proposes strategies for improving the accuracy and usefulness of leakage inductance modeling using the Dowell model (DM). As the analytical method of modeling the leakage inductance model considers geometrical factors, it is vital for front-loading transformer design. DM is one such widely used one-dimensional magnetic field-based approach for analytically modeling both AC resistance and leakage inductance. It is more accurate and requires less computational work than other analytical approaches proposed in previous studies. However, some approximations may cause errors and eventually lead to inaccurate results. Therefore, this study aims to ascertain the conditions that result in inaccurate leakage inductance modeling. Additionally, a simple exponential-based model and an artificial neural network are developed to increase the accuracy of inaccurate modeling. The results clarify the conditions that result in a frequency-dependent and bias error. Moreover, the intended findings indicate that the proposed strategies effectively improve modeling accuracy while simultaneously providing some extra advantages for transformer design.</p>

    DOI: 10.1541/ieejjia.22007452

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  25. Balanced Two-phase Interleaved Boost Converter with Integrated Magnetics for Common-Mode Noise Reduction Invited Reviewed

    Nagai Tomotaka, Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi, Nakano Akira

    IEEJ Journal of Industry Applications   Vol. advpub ( 0 )   2023

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    <p>This paper presents an interleaved boost converter with integrated magnetics for common-mode (CM) noise reduction without introducing electromagnetic interference (EMI) filters. The noise reduction is realized using the balanced technique, which is an effective CM noise reduction technique from a circuit topology perspective. The application of this technique addresses the issue of the CM noise, while avoiding an increase in circuit volume due to EMI filters. Additionally, an interleaved circuit topology and integrated magnetics contribute to realizing the high-power density converter. The effectiveness of the proposed converter is discussed through theoretical analyses, simulations, and experiments.</p>

    DOI: 10.1541/ieejjia.22007783

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  26. Fixed Frequency Operation in Critical Conduction Mode with Voltage-Controlled Variable Inductor Reviewed International coauthorship International journal

    Choi S., Shin J.W., Imaoka J., Yamamoto M.

    2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023     page: 6444 - 6449   2023

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    This study introduces a novel voltage-controlled variable inductor (VI) that effectively fixes the switching frequency of DC-DC converters operating in the critical conduction mode (CRM). The proposed VI addresses the limitations encountered with conventional current-controlled VIs, such as complex winding structures, control challenges, and reliance on magnetic saturation. In the proposed voltage-controlled VI, the primary-side inductance of a coupled inductor is regulated by an auxiliary voltage source on the secondary side. The validity of the proposed VI is experimentally verified using a prototype CRM boost converter with an output voltage of 400 V. Experimental results demonstrate that the switching frequency remains fixed at 100 kHz, and the main converter maintains soft switching characteristics regardless of variations in output power.

    DOI: 10.1109/ECCE53617.2023.10362859

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  27. Modeling of Lithium-Ion Batteries with Constant Phase Element and Butler-Volmer's Equation Reviewed International journal

    Yamahigashi T., Shimura J., Shibuya K., Wu Y.H., Shigematsu K., Hosotani T., Kuromi J., Imaoka J., Yamamoto M.

    ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics     page: 697 - 702   2023

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    An equivalent circuit model of lithium-ion batteries which has a nonlinear resistor governed by Butler-Volmer's equation and a constant phase element was investigated. The current dependence of the real battery could be reproduced well by the contribution of the nonlinear resistor, and the transient response of voltage could be reproduced well by the contribution of the constant phase element.

    DOI: 10.23919/ICPE2023-ECCEAsia54778.2023.10213775

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  28. Investigation on Relationship between Common Mode Noise and Distribution of Parasitic Capacitance Reviewed

    Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. 12 ( 3 ) page: 484 - 492   2023

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    <p>This study investigates the influence of parasitic capacitance on the common mode (CM) noise in a converter. A thermal pad on a switching device is necessary for sufficient heat dissipation. In addition, the thermal pad increases the CM capacitance between the printed circuit board and the ground plane. The parasitic capacitances form CM noise propagation paths. However, which node in the circuit and the corresponding parasitic capacitance influences the CM noise the most and the degree of the parasitic capacitance influence on the CM noise are unclear. In this study, the parasitic capacitance that influences the CM noise in a converter is identified, and the extent to which the parasitic capacitance affects the CM noise is investigated through simulations and experiments.</p>

    DOI: 10.1541/ieejjia.22008018

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  29. High reliable transformer-less deadtime less Inverter for Grid-connected Applications Reviewed International coauthorship International journal

    Senanayake S., Senanayake T., Imaoka J., Yamamoto M.

    ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics     page: 1788 - 1794   2023

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    This paper presents a transformer-less inverter topology that brings out the high-performance for grid connected inverters. The main advantages of this inverter eliminate the dead-time requirement, and allows both top and bottom switch from being on at same time, and thus shorting the DC bus supply to ground. This avoids the freewheeling diodes connected across the switches for loads other than purely resistive. Low output voltage distortion and low fundamental and common voltages losses result in high efficiency and high output power density. The input dc source and the output ac voltage share the same ground in proposed inverter, which effectively eliminates the leakage current caused by the DC source (PV panel, battery bank etc.). Analysis and simulation results are presented to demonstrate the effectiveness of the proposed inverter. Compared to the prior literature mentioned in this paper, 75- 86% reduction of semiconductor components is achieved with proposed inverter topology.

    DOI: 10.23919/ICPE2023-ECCEAsia54778.2023.10213921

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  30. Gate Drive Circuit Suitable for a GaN Gate Injection Transistor Reviewed International journal

    Hattori, F; Yanagisawa, Y; Imaoka, J; Yamamoto, M

    IEEE ACCESS   Vol. 11   page: 43169 - 43182   2023

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    A GaN gate injection transistor (GIT) has great potential as a power semiconductor device. However, a GaN GIT has a diode characteristic at the gate-source, and a corresponding gate drive circuit is thus required. Several studies in the literature have proposed the gate drive circuits with the speed-up capacitors, but adding these capacitors complicates the gate drive circuit, and increases both the drive and reverse conduction losses. Moreover, driving a GaN GIT with such gate drive circuits becomes more susceptible to the false turn-on. In this paper, a gate drive circuit suitable for a GaN GIT without a speed-up capacitor is proposed. This type can provide the high-speed switching, and exhibit the low gate drive loss and reverse conduction loss. The proposed circuit also has high immunity against the false turn-on and stable gate-source voltage before and after startup. The drive loss of the proposed type is calculated and its validity is confirmed experimentally. Furthermore, the drive loss of the proposed type is compared with the conventional circuits. The result shows that the drive loss of the proposed type is improved by up to 50 %, compared with the conventional type. Finally, the proposed type is experimentally tested to drive a buck converter at the switching frequency of 150 kHz. The entire loss of the converter can be reduced by up to 9.2% at 250 W, compared with the conventional type.

    DOI: 10.1109/ACCESS.2023.3270261

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  31. A current fed full bridge converter with auxiliary resonant capacitor Reviewed

    Tomoki Yamada, Yu Yonezawa, Masayoshi Yamamoto

    IEICE Electronics Express   Vol. 20 ( 21 )   2023

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    Other Link: https://www.jstage.jst.go.jp/article/elex/20/21/20_20.20230351/_article/-char/en

  32. Modeling of Lithium-Ion Batteries with Constant Phase Element and Butler-Volmer’s Equation Reviewed

    T. Yamahigashi, J. Shimura, K. Shibuya, Y. ,K. Shigematsu, T. Hosotani, J. Kuromi, J. Imaoka, and M. Yamamoto

    IEEE Energy Conversion Congress and Exposition Asia     page: 667 - 702   2023

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  33. Design of Coupled Inductor Using Powder Core with Concentrated Air Gap in Multiphase Operation Reviewed International coauthorship

    Sihoon Choi, Jun Imaoka and Masayoshi Yamamoto

    IEEE Transactions on Industry Applications     2023

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  34. Butler–Volmer の式に従う非線形抵抗とCPEとを含むリチウムイオン電池の等価回路モデル Reviewed

    南家憲史,渋谷賢佑,重松浩一,今岡淳,山本真義,細谷達也,黒見仁,志村重輔

    第64回電池討論会     2023

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  35. Overview of System Simulation Technology for Electric and Hybrid Aircraft Reviewed

    Yamamoto Masayoshi, Shigematsu Koichi, Yamahigashi Takamitsu, Shibuya Kensuke, Maeda Mitsuyasu, Fujimori Mitsuaki

    SYSTEMS, CONTROL AND INFORMATION   Vol. 66 ( 12 ) page: 457 - 463   2022.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (other academic)   Publisher:THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS  

    DOI: 10.11509/isciesci.66.12_457

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  36. A Study of Thermal and Electrical Multi-Domain Model of Aluminum Electrolytic Capacitors Reviewed

    Mukaiyama Daisaku, Yamamoto Masayoshi

    Journal of The Japan Institute of Electronics Packaging   Vol. 25 ( 6 ) page: 527 - 534   2022.9

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    DOI: 10.5104/jiep.25.527

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  37. 13.56MHz Half-Bridge GaN-HEMT Resonant Inverter Achieving High Power, Low Distortion, and High Efficiency by ‘L-S Network’ Invited Reviewed

    OYANE Aoi, SENANAYAKE Thilak, MASUDA Mitsuru, IMAOKA Jun, YAMAMOTO Masayoshi

    IEICE Transactions on Electronics   Vol. E105C ( 9 ) page: 407 - 418   2022.9

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    <p>This paper proposes a topology of high power, MHz-frequency, half-bridge resonant inverter ideal for low-loss Gallium Nitride high electron mobility transistor (GaN-HEMT). General GaN-HEMTs have drawback of low drain-source breakdown voltage. This property has prevented conventional high-frequency series resonant inverters from delivering high power to high resistance loads such as 50Ω, which is typically used in radio frequency (RF) systems. High resistance load causes hard-switching also and reduction of power efficiency. The proposed topology overcomes these difficulties by utilizing a proposed ‘L-S network’. This network is effective combination of a simple impedance converter and a series resonator. The proposed topology provides not only high power for high resistance load but also arbitrary design of output wattage depending on impedance conversion design. In addition, the current through the series resonator is low in the L-S network. Hence, this series resonator can be designed specifically for harmonic suppression with relatively high quality-factor and zero reactance. Low-distortion sinusoidal 3kW output is verified in the proposed inverter at 13.56MHz by computer simulations. Further, 99.4% high efficiency is achieved in the power circuit in 471W experimental prototype.</p>

    DOI: 10.1587/transele.2021ECP5048

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  38. Spike Surge and Conducted EMI Simulation of DC Brush Motor Considering Steady Arc at Mechanical Contacts Reviewed International journal

    Katagiri Kodai, Ogawa Toru, Yamamoto Masayoshi, Imaoka Jun, Sasaki Mamoru

    IEEJ Transactions on Industry Applications   Vol. 142 ( 7 ) page: 490 - 497   2022.7

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    <p>This study provides a circuit analysis model of a DC brush motor to predict spike surges at mechanical contacts and conducted EMI by considering the behavior of steady arc discharge. The mechanical contacts model comprises multiple variable resistors, constant voltage sources, ideal diodes, and stray capacitances. In the proposed model, spike surges with steady arc could be predicted with 90% accuracy. Moreover, simulated conducted EMI according to CISPR 25 standard is deviated from the measured value at a maximum of 25dB. Therefore, it is demonstrated that the quantitative prediction of conducted EMI requires consideration of a showering arc model at mechanical contacts.</p>

    DOI: 10.1541/ieejias.142.490

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  39. An Evaluation of a New Type of High Efficiency Hybrid Gate Drive Circuit for SiC-MOSFET Suitable for Automotive Power Electronics System Applications Invited Reviewed

    YAMAMOTO Masayoshi, SHIRAI Shinya, THILAK Senanayake, IMAOKA Jun, ISHIDO Ryosuke, OKAWAUCHI Yuta, NAKAHARA Ken

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   Vol. E105A ( 5 ) page: 834 - 843   2022.5

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    <p>In response to fast charging systems, Silicon Carbide (SiC) power semiconductor devices are of great interest of the automotive power electronics applications as the next generation of fast charging systems require high voltage batteries. For high voltage battery EVs (Electric Vehicles) over 800V, SiC power semiconductor devices are suitable for 3-phase inverters, battery chargers, and isolated DC-DC converters due to their high voltage rating and high efficiency performance. However, SiC-MOSFETs have two characteristics that interfere with high-speed switching and high efficiency performance operations for SiC MOS-FET applications in automotive power electronics systems. One characteristic is the low voltage rating of the gate-source terminal, and the other is the large internal gate-resistance of SiC MOS-FET. The purpose of this work was to evaluate a proposed hybrid gate drive circuit that could ignore the internal gate-resistance and maintain the gate-source terminal stability of the SiC-MOSFET applications. It has been found that the proposed hybrid gate drive circuit can achieve faster and lower loss switching performance than conventional gate drive circuits by using the current source gate drive characteristics. In addition, the proposed gate drive circuit can use the voltage source gate drive characteristics to protect the gate-source terminals despite the low voltage rating of the SiC MOS-FET gate-source terminals.</p>

    DOI: 10.1587/transfun.2021GCI0001

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  40. Analysis of DC Brush Motor Spike Surge and Proposal of a Simulation Model Based on an Equivalent Circuit Reviewed International journal

    Katagiri Kodai, Ogawa Toru, Yamamoto Masayoshi, Imaoka Jun, Sasaki Mamoru, Noda Kazuhiro

    IEEJ Transactions on Industry Applications   Vol. 142 ( 3 ) page: 167 - 176   2022.3

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    <p>This paper presents a circuit analysis model to predict spike surges at mechanical contacts of a DC brush motor. Measured spike surge waveforms are classified into four types depending on the existence of a steady arc and a showering arc. The directly open without arcs condition is clarified to be the maximum spike surge voltage condition. Additionally, an equivalent circuit model is developed to simulate spike surges. This model considers complex high-frequency characteristics and rotation angle dependence of impedances. A full-slot equivalent circuit model is represented by a combination of single-slot models. The spike surge simulation model considers induced voltage and variable resistors representing mechanical contact switching in addition to impedance characteristics. The simulated spike surges show good quantitative agreement with the measured values.</p>

    DOI: 10.1541/ieejias.142.167

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  41. Improving DC superimposition characteristics of powder cores by applying coupled inductors in multi-phase boost converter Reviewed

    Aoki Tatsuya, Imaoka Jun, Yamamoto Masayoshi, Yoshimoto Kosuke

    IET POWER ELECTRONICS   Vol. 15 ( 3 ) page: 237 - 250   2022.2

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    In applications where DC current is superimposed, such as inductors for non-isolated DC-DC converters, powder core can be considered as an attractive solution owing to its superior features such as: high saturation flux density, high Curie temperature, and soft-saturation property. However, in powder cores, a drop of inductance appears prominently due to DC superimposition characteristics. This feature is not a desirable characteristic because it leads to an increase in the inductor ripple current under heavy load, which complicates the thermal design of power semiconductors and capacitors. This paper verifies the improvement of DC superimposition characteristics of powder cores by applying coupled inductors. First, the effect of coupled inductors on the improvement of DC superimposition characteristics is experimentally verified. Second, a measurement method for the DC superimposition characteristics of coupled inductor is proposed. Then, a magnetic circuit model is built using the measurement results. Finally, a coupled analysis of magnetic and electric circuits is performed, and it is confirmed that lower magnetic field operation can be realized by coupled inductors even under heavy load conditions. It has been proven that coupled inductors are effective in improving the DC superposition characteristics of the powder cores.

    DOI: 10.1049/pel2.12226

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  42. Frequency Doubler Gate Drive Circuit Suitable for High-Frequency Applications Reviewed International coauthorship International journal

    Hattori, F; Ushida, Y; Sumiya, K; Yanagisawa, Y; Imaoka, J; Noah, M; Yamamoto, M

    IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS   Vol. 10 ( 1 ) page: 617 - 631   2022.2

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    In megahertz (MHz) power converters, the gate drive loss becomes one of the main issues that should be addressed. In the relevant literature, several gate drive circuits had been proposed to reduce the gate drive losses. A literature survey is provided in the introduction section to summarize the merits and demerits of each circuit. These studies proposed innovative methods to reduce gate drive loss. Nonetheless, they did not propose any solution to reduce the loss of the buffer stage inside the drive IC. In this article, we present a frequency doubler gate drive circuit. The proposed gate drive circuit can double the frequency of the input PWM signal at the driver output stage, using the second harmonic of the input signal. Therefore, the loss of the buffer stage inside the drive IC can be significantly reduced, compared with the hard-switching, the inductive resonant, and multiresonant gate drive circuits. This article focuses on designing, simulating, and experimentally validating the frequency doubler gate drive circuit with a 6.78-MHz input frequency and 13.56-MHz driving frequency. The concept of a frequency tripler gate drive circuit is also introduced and discussed. For instance, the frequency tripler gate drive circuit can triple the frequency of the input PWM signal at the driver output stage using the third harmonic; in this scenario, a 20.34-MHz driving frequency can be obtained. The proposed frequency doubler gate drive circuit is experimentally tested in a 13.56-MHz class E inverter.

    DOI: 10.1109/JESTPE.2021.3089506

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  43. 非制御 LLC共振形コンバータを用いた モジュラーDC-DCコンバータの電流分担制御 Invited Reviewed

    電気学会論文誌D     2022

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  44. Voltage-Controlled Variable Inductor for Fixed-Frequency Critical Conduction Mode Operation Invited Reviewed

    S. Choi, J. -W. Shin, J. Imaoka and M. Yamamoto

    IEEE Transactions on Industrial Electronics     2022

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  45. Reducing Transformer Losses with Adjustable Path-Core Type Inductance in 1.4-MHz LLC Resonant Converters Invited Reviewed

    Ou Tengfei, Noah Mostafa, Tsuruya Mamoru, Namiki Seiji, Morita Koichi, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications, vol   Vol. 11 ( 5 ) page: 664 - 673   2022

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  46. Transformer with Adjustable Path-Core Type Inductance for Use in GaN-HEMT LLC Resonant Converter Invited Reviewed

    Ou Tengfei, Noah Mostafa, Tsuruya Mamoru, Namiki Seiji, Morita Koichi, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. 11 ( 1 ) page: 41 - 48   2022

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    <p>A novel magnetic structure for use in LLC resonant converters is proposed in this paper. It is known as a Path-core type Resonant Inductance Adjustable (PRIA) transformer, which is a type of transformer with adjustable resonant inductance. In the proposed transformer, the resonant inductance and magnetizing inductance can be designed separately; therefore, it becomes less challenging to realize the required resonant frequency. Moreover, the magnetizing inductance is not affected by any variation in the resonant inductance. The proposed PRIA transformer is found to improve the efficiency of the LLC converters. In this paper, the design of a resonant inductance of a PRIA transformer is presented. In addition, the application of PRIA transformers to a 1-MHz LLC resonant converter and 1kW 1.4-MHz LLC resonant converter is presented.</p>

    DOI: 10.1541/ieejjia.21002488

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  47. An Investigation and Proposal for Accurate Leakage Inductance Modeling Based on Dowell Model Reviewed

    Wu Y.H., Shigematsu K., Omoto Y., Imaoka J., Yamamoto M.

    2022 International Power Electronics Conference, IPEC-Himeji 2022-ECCE Asia     page: 1964 - 1969   2022

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    The aim of this research is to build a highly applicable, accurate, and fast leakage inductance modeling method based on Dowell model. Which is a widely used analytical modeling method to estimate AC resistance and leakage inductance. Since most of the literatures use Dowell model basically with the limited condition achieving ac-curate modeling of leakage inductance, in this research, an accuracy investigation is conducted with the samples of EE-core transformers by finite element method (FEM) simulation and practical transformers to find the inaccurate modeling related to the geometrical characteristic. After that, a proposed hybrid modeling using artificial neural network (ANN) is conducted to create a black box error correction model of conventional Dowell model with FEM results. As the result, the modeling shows high accuracy by Dowell with ANN error correction model. It carries out the future to develop a modified Dowell model by analyzing the ANN error correction model. Which can describe the geometrical characteristic of transformer accurately.

    DOI: 10.23919/IPEC-Himeji2022-ECCE53331.2022.9807009

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  48. Common Mode Noise Reduction of Two-Phase Interleaved Boost Converters with Integrated Magnetics Utilizing Balanced Technique Reviewed

    Nagai T., Sasaki M., Imaoka J., Yamamoto M., Nakano A.

    2022 International Power Electronics Conference, IPEC-Himeji 2022-ECCE Asia     page: 746 - 752   2022

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    High-power density and high efficiency in boost converters are required in several applications such as motor drive systems in eco-friendly vehicles and power conditioning systems used in renewable energy systems. To realize these requirements, applying compound semiconductor devices such as GaN and SiC are attractive options because they can drive at high-switching frequency with low power losses, and it is known to contribute to the miniaturization of passive devices. However, when driving power devices with high switching speed at high-switching frequency, EMI (Electro-Magnetic Interference) noise with a wide spectrum is produced. To attenuate EMI noise, large EMI filters have to be equipped. When using large EMI filters, the downsizing effect of power converters is reduced. To countermeasure the above problem, this paper proposes interleaved boost converter with integrated magnetics capable of Common-Mode (CM) noise reduction without adding EMI filters. The noise reduction is realized by the balanced technique, which is known as an effective noise reduction technique from a circuit topology perspective. In addition, interleaved circuit topology and integrated magnetics are contributed to realizing high-power density converters. The effectiveness of the proposed converters is discussed from simulation and experimental viewpoints.

    DOI: 10.23919/IPEC-Himeji2022-ECCE53331.2022.9806834

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  49. An Investigation and Proposal for Accurate Leakage Inductance Modeling Based on Dowell Model Reviewed

    Wu Yu-Hsin, Shigematsu Koichi, Omoto Yasumichi, Imaoka Jun, Yamamoto Masayoshi

    2022 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIMEJI 2022- ECCE ASIA)     page: 1964 - 1969   2022

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  50. An Investigation on the Relationship between CM Noise and Distribution of Parasitic Capacitance Reviewed

    Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi

    2022 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIMEJI 2022- ECCE ASIA)     page: 753 - 758   2022

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  51. Analytical Model of Class-D Inverter for High-frequency Operation Reviewed

    Xiong Y., Thilak S., Arai D., Yonezawa Y., Imaoka J., Yamamoto M.

    IECON Proceedings (Industrial Electronics Conference)   Vol. 2022-October   2022

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    This paper proposed an approach to transferring nonlinear parasitic drain-source capacitance of MOSFET to a linear model by charge-related equivalent conversion. It is applied to a previously researched analytical model of the class-D inverter to add its feasibility in high frequency. Based on the proposed approach, the relationship between maximum operation frequency, the nonlinear capacitance, and the input voltage are inferred and verified by spice simulation, resulting in good consistency.

    DOI: 10.1109/IECON49645.2022.9968760

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  52. Common Mode Noise Reduction of Two-Phase Interleaved Boost Converters with Integrated Magnetics Utilizing Balanced Technique Reviewed

    Nagai Tomotaka, Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi, Nakano Akira

    2022 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIMEJI 2022- ECCE ASIA)     page: 746 - 752   2022

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  53. Derivation of Resonant Period for Soft Switching by Linearizing Output Capacitance of Switching Device Reviewed

    Choi Sihoon, Suzuki Ayato, Imaoka Jun, Yamamoto Masayoshi

    2022 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIMEJI 2022- ECCE ASIA)     page: 2236 - 2241   2022

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  54. Derivation of Resonant Period for Soft Switching by Linearizing Output Capacitance of Switching Device Reviewed

    Choi S., Suzuki A., Imaoka J., Yamamoto M.

    2022 International Power Electronics Conference, IPEC-Himeji 2022-ECCE Asia     page: 2236 - 2241   2022

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    Many soft switching techniques utilize the resonance between an inductor and parasitic output capacitor of switching device. However, output capacitance has nonlinear characteristics depending on drain-source voltage which obscure the resonant period. The proposed method estimates the resonant period by linearizing output capacitance. The method can be applied to the bridge-type converter which utilizes resonance for soft switching. Simulation and experiment with a 3-kVA prototype half bridge auxiliary resonant commutated pole inverter were implemented to verify the proposed method.

    DOI: 10.23919/IPEC-Himeji2022-ECCE53331.2022.9806865

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  55. Derivation of Resonant Period for Soft Switching Considering Nonlinear Characteristics of Output Capacitance in Switching Device Reviewed

    Choi Sihoon, Suzuki Ayato, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. advpub ( 0 )   2022

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    <p>Many soft switching techniques utilize a resonance between an inductor and parasitic output capacitors of switching devices. However, output capacitance has nonlinear characteristics, which obscures the resonant period for soft switching. In this paper, a new method is proposed to derive the resonant period by considering nonlinear characteristics of the output capacitance. The method can be applied to a bridge-type converter which utilizes resonance for soft switching. Other parasitic capacitances which affect the resonant period, are also considered. To verify the proposed method, simulations and experiments were performed with a 3-kVA prototype half bridge auxiliary resonant commutated pole inverter.</p>

    DOI: 10.1541/ieejjia.22006987

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  56. Feasible Evaluations of Low Profile Magnetic Structure Based on Meander Winding and Split-Magnetic Cores with High-Cooling Capability Used in Power Converters Reviewed International coauthorship International journal

    Imaoka, J; Kazuya, M; Ochiai, H; Shigematsu, K; Noah, M; Yamamoto, M

    2022 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     2022

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    It is well-known that wide-bandgap power semiconductor devices such as GaN and SiC have attractive features such as low on-resistance and capability of high switching speed, which results in realizing high power density converters. Therefore, power converters using GaN (Gallium Nitride) or SiC (Silicon Carbide) power devices have usually high efficiency, smaller passive components can be adopted than Si-based power converters by driving the converter at high switching frequency. However, driving at high switching frequency may result in a temperature rise of magnetic components, which can be one of the critical issues due to a downsized small surface area of magnetic cores and increasing power loss density per unit volume. Therefore, this paper proposes and evaluates a low-profile magnetic structure based on split-magnetic cores and meander winding capable of high cooling performance. The effectiveness of the proposed magnetic structure used in power converters is confirmed by experimental tests.

    DOI: 10.1109/ECCE50734.2022.9947805

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  57. Finite Element Method based Thermal Magnetic Core Characteristics Modeling and Thermal Simulation Reviewed International journal

    Ochiai, H; Shigematsu, K; Imaoka, J; Yamamoto, M

    2022 IEEE 31ST INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)   Vol. 2022-June   page: 320 - 324   2022

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    Electric vehicles and electric aircraft are being developed for decarbonization, and their power converters need to be miniaturized. High-frequency switching of semiconductors using GaN or SiC materials is an attracting attention as one of the options to reduce the size of the inductor core. On the other hand, reducing the core size leads to an increase in core temperature. Therefore, Design methods that take heat into consideration are desired, and the use of simulation is expected. Although FEM is an accurate simulation method, it takes a lot of calculation time when used as a thermal simulation during the circuit operation for several hours. Thus, accurate core loss modeling is necessary. In this study, we used accurate FEM-based modeling to perform thermal simulation of inductors in high-frequency switching.

    DOI: 10.1109/ISIE51582.2022.9831609

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  58. Modeling and Design Method of Coupled Inductor Using Powder Core with Concentrated Air Gap Reviewed International coauthorship International journal

    Choi, S; Imaoka, J; Yamamoto, M

    2022 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     2022

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    Concentrated air gap is utilized to suppress soft saturation characteristics of powder cores by increasing effective magnetic reluctance. This paper proposes a high-precision magnetic circuit model for powder core in coupled inductors. The proposed model, considering soft saturation and flux cancellation, can be utilized even with large air gap, and simplifies the magnetic design. The model features good accuracy of inductance variation in a wide range of winding current. Five prototype coupled inductors were built using the proposed model and applied to a 1-kW interleaved boost converter to prove the precision of the proposed magnetic circuit.

    DOI: 10.1109/ECCE50734.2022.9947578

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  59. Reducing Transformer Losses with Adjustable Path-Core Type Inductance in 1.4-MHz LLC Resonant Converters Invited Reviewed

    Ou Tengfei, Noah Mostafa, Tsuruya Mamoru, Namiki Seiji, Morita Koichi, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. 11 ( 5 ) page: 664 - 673   2022

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    <p>Path-core type resonant inductance adjustable (PRIA) transformer usage in high-frequency LLC resonant converters is proposed herein to reduce transformer losses. The proposed magnetic structure is a type of transformer with adjustable resonant inductance combined with a path core for LLC resonant converters. In the proposed transformer, the flux density of the magnetizing inductance can be reduced with a path core. Therefore, fewer core losses are generated when using the proposed transformer. Moreover, the flux of leakage inductance that can be set with the path core has been previously proven by researchers at the Nagoya University laboratory. Consequently, the coil losses, which are one of the largest components of transformer losses, can be reduced effectively by controlling the path of the leakage flux. The proposed PRIA transformer has been reported to improve the efficiency of LLC converters. In this study, a conventional transformer with a magnetic structure is compared with a PRIA transformer through experiments. The core losses were obtained through finite-element simulations, and the coil losses not generated by the magnetic structures were estimated via calculations. The advantage of reducing transformer losses in high-frequency LLC resonant converters with PRIA-structure transformers is presented in this work.</p>

    DOI: 10.1541/ieejjia.21012384

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  60. A Magnetic Design Method for Powder Core Inductor with Concentrated Airgap Considering DC Superposition Characteristics Used for High Current Applications

    Imaoka J., Yu-Hsin W., Shigematsu K., Noah M., Yamamoto M., Martinez W.

    2021 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe     2021.9

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    Powder cores are attractive magnetic cores for high current applications such as bidirectional dc/dc converters used in power trains of eco-friendly automotive because of their high saturation flux density, high Curie temperature, and soft saturation characteristics. However, powder cores have nonlinear relative permeability characteristics dependent on the magnetic field intensity which results in a drop in the inductance value at high current values. There are two key solutions to keep constant inductance value at maximum power rating of circuit specifications: (1) inserting a concentrated airgap (2) reducing the number of turns to tackle the drop of relative permeability due to dc-bias. Therefore, this paper proposes a novel magnetic design method for powder core inductors with concentrated airgap which to keep the desired inductance constant under dc-bias conditions. The feature of the proposed design methodology is based on considering non-linear relative permeability directly based on the magnetic characteristics modeling. The validity of the proposed method is confirmed by experimental tests using EE core.

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  61. Cooperative Control of Multi-Input Modular DC/DC Converter for Electric Off-Highway Vehicles Reviewed International coauthorship International journal

    Piao Qingyun, Kakisaka Tasuku, Imaoka Jun, Yamamoto Masayoshi, Konoto Masaaki

    IEEJ Transactions on Industry Applications   Vol. 141 ( 4 ) page: 304 - 312   2021.4

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    <p>A cooperative control scheme for a power conversion system having several energy sources and modular dc/dc converters is proposed in this paper. The proposed cooperative control approach has the advantage of realizing constant dynamic characteristics even when the different input voltages fluctuate or when the output power of each input voltage source is limited. The effectiveness of the proposed cooperative control method is verified via simulation and experiment.</p>

    DOI: 10.1541/ieejias.141.304

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  62. Improvement of the Transmission Efficiency in the Electric Field Resonance Wireless Power Transmission by Utilizing Helical Resonators

    OYANE Aoi, YAMAMOTO Masayoshi

      Vol. J104-B ( 3 ) page: 309 - 311   2021.3

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    The efficiency of electric field resonance wireless power transmission (WPT) is low in long distances. However, the proposed system realizes high efficiency in long distances by utilizing high-Q helical resonators. The transmission efficiency of the proposed system is increased by at most 69.4% compared with the conventional system at 27.12MHz.

    DOI: 10.14923/transcomj.2020gwl0001

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  63. A Novel Power Loss Calculation Method for Power Magnetic Components in Power Converters Reviewed

    Ishikura Yuki, Hosotani Tatsuya, Yamamoto Masayoshi

    IEEJ Transactions on Fundamentals and Materials   Vol. 141 ( 1 ) page: 69 - 75   2021.1

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    <p>This paper reports a power loss calculation method for magnetic components in power converters. The differences in B-H loop areas are analyzed and discussed in case of sinusoidal waveform and square wave voltage excitation. Relying on the output results, iron loss calculation method based on square wave excitation is proposed. Experimental results show that the proposed iron loss calculation method is accurate compared with the traditional method using Steinmetz's equation. In addition, the proposed method reduces the calculation procedure compared with the method using Steinmetz's equation. The proposed iron loss calculation method is very practical and beneficial for converter designers.</p>

    DOI: 10.1541/ieejfms.141.69

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  64. Effect of Tunnel Pits Radius Variation on the Electric Characteristics of Aluminum Electrolytic Capacitor Reviewed International journal

    MUKAIYAMA Daisaku, YAMAMOTO Masayoshi

    IEICE Transactions on Electronics   Vol. E104C ( 1 ) page: 22 - 33   2021.1

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    <p>Aluminum Electrolytic Capacitors are widely used as the smoothing capacitors in power converter circuits. Recently, there are a lot of studies to detect the residual life of the smoothing Aluminum Electrolytic Capacitors from the information of the operational circuit, such as the ripple voltage and the ripple current of the smoothing capacitor. To develop this kind of technology, more precise impedance models of Aluminum Electrolytic Capacitors become desired. In the case of the low-temperature operation of the power converters, e.g., photovoltaic inverters, the impedance of the smoothing Aluminum Electrolytic Capacitor is the key to avoid the switching element failure due to the switching surge. In this paper, we introduce the impedance calculation model of Aluminum Electrolytic Capacitors, which provides accurate impedance values in wide temperature and frequency ranges.</p>

    DOI: 10.1587/transele.2020ECP5009

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  65. A simple gate driver design for GaN-based switching devices with improved surge voltage and switching loss at 1 MHz operation Reviewed

    Jodo S., Iwaki T., Uchiyama K., Islam M.Z., Kataoka K., Hayakasa Y., Imaoka J., Yamamoto M., Niitsu K.

    Japanese Journal of Applied Physics   Vol. 60 ( SA )   2021.1

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    In power electronics, the impedance of reactance components increases proportionally with frequency; therefore, the sizes of reactance components can be reduced by increasing the switching frequency. Gallium nitride (GaN)-based devices have received significant attention in high-frequency applications because the figure-of-merit of GaN is superior to that of silicon (Si). However, for high-frequency operation, a trade-off relationship between the surge voltage induced by parasitic inductances, and the switching loss becomes significant. Therefore, in this study, we propose a gate driver that improves the trade-off relationship. This gate driver was obtained via the addition of simple logic circuits and capacitors to a conventional gate driver. The effectiveness of our proposed circuit was verified via SPICE simulations with Cadence Spectre using 180 nm CMOS technology. The simulation results show that by operating at 1 MHz, this circuit can help reduce the surge voltage by 12.2% and the switching loss by 14.3%.

    DOI: 10.35848/1347-4065/abbdc7

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  66. Bidirectional Converter with Multi-stage FETs Featuring Voltage Balance Control Function Using Variable Capacitors

    Ishikura Yuki, Hosotani Tatsuya, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. 10 ( 1 ) page: 100 - 106   2021

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    <p>This paper presents a bidirectional converter with multi-stage FETs featuring voltage balance control function using variable capacitors. The proposed converter is constructed using low-voltage Si-FETs in a series connection, and it improves the voltage balance between the drain-source voltages of the series connected FETs in the OFF period. Using the converter figure of merit (FOM), which can estimate the converter losses from the specifications of the FETs, the effectiveness of the proposed converter is compared to that of a converter using SiC-FETs. The factors of the voltage unbalance are analytically clarified using the equivalent circuit. The principle of voltage balance control function using the variable capacitor is discussed. The experimental results show that the proposed converter can achieve a maximum power conversion efficiency of 99.2%.</p>

    DOI: 10.1541/ieejjia.19003873

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  67. Reversed Configuration Boost Converter to Reduce Effective CM Capacitance Reviewed

    Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi

    2021 IEEE INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC)     2021

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    More and more wide band gap power devices are used in switching converters to achieve high power density and high efficiency. However,those devices increase electromagnetic interference (EMI),especially common mode (CM) noise propagates through parasitic capacitance. A noise filter is a popular way to decrease EMI. But a filter decreases the power density of the converter because of the bulk components. Therefore,a noise reduction method with small increase in volume and weight is necessary. In this paper,a novel but simple circuit configuration for high power application to reduce CM noise is investigated in simulation and experiment.

    DOI: 10.1109/IFEEC53238.2021.9662002

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  68. Time-Shifted Control of Self-Synchronous Rectifier For MHz Wireless Power Transfer Systems

    Sasaki Masato, Sakuno Keiichi, Yamamoto Masayoshi

    PROCEEDINGS OF 2021 IEEE 30TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)   Vol. 2021-June   2021

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    Recently wireless power transfer systems via resonant magnetic coupling (MRC-WPT) is the promising wireless power supply method to mobile applications. 13.56MHz highly resonant wireless power receivers experience high rectifier losses when using Schottky diodes and can fail to meet the thermal limit requirements for many products such as laptops. Therefore, the synchronous rectification is one of the effective solutions. However, the increased occupancy of the control signal propagation delay in switching cycle, tend to make the introduction of the synchronous rectification difficult. This novel synchronous rectifier can operate under any propagation delay of gate drivers. The analysis successfully verified the operating principle and clarified the usefulness of the proposed control for MHz WPT systems.

    DOI: 10.1109/ISIE45552.2021.9576180

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  69. A Magnetic Design Method for Powder Core Inductor with Concentrated Airgap Considering DC Superposition Characteristics Used for High Current Applications

    Imaoka Jun, Yu-Hsin Wu, Shigematsu Koichi, Noah Mostafa, Yamamoto Masayoshi, Martinez Wilmar

    2021 23RD EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'21 ECCE EUROPE)     2021

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  70. A Novel Measurement Method for DC Superimposition Characteristics of Three-Phase Coupled Inductors with Powder Cores

    Mishima Yamato, Aoki Tatsuya, Matsuta Kazuya, Imaoka Jun, Yamamoto Masayoshi, Yoshimoto Kosuke

    2021 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     page: 5334 - 5341   2021

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    the objective of this research is to build the measurement method of DC superimposition of multiphase coupled inductors with powder cores. From a perspective of magnetic material, powder cores are usually applied to inductor core in high current applications such as E-mobility due to their attractive features. In addition, multiphase DC/DC converters with coupled inductors can effectively downsize passive components that occupy significant space in power converters. However, when applying coupled inductor with powder cores under the dc current superimposed condition, self-inductance and mutual inductance values of coupled inductors are varied depending on dc current values. Furthermore, measurement methods of the dc superimposition characteristics of multiphase coupled inductor have not been discussed in the relevant literature. Therefore, this paper proposes two measurement methods for DC superimposition characteristics of three-phase coupled inductors with powder cores used in three-phase DC-DC converters. The first method is for three-phase coupled inductors with an asymmetric magnetic core structure, and the values of each self-inductance and mutual inductance can be measured separately. The second method is a simplified measurement method limited to multiphase coupled inductors with symmetric magnetic core structures. DC superimposition characteristics of coupled inductors can be measured with a smaller number of measurements than the first method, and it can be extended to N phase coupled inductors. The verification of the two methods has been evaluated through simulation and experiment.

    DOI: 10.1109/ECCE47101.2021.9595692

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  71. Analysis on Parasitic Capacitance to Prevent False Turn-on in GaN HEMT

    Iwaki Toshihiro, Sawada Takashi, Imaoka Jun, Yamamoto Masayoshi

    2021 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     page: 5616 - 5621   2021

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    Driving power devices such as GaN HEMTs at high-frequency is one of the successful solutions to miniaturize the magnetic components of circuits. On the other hand, GaN HEMTs have drawbacks in high-speed switching. For example, in a full-bridge inverter configuration, a fast turn-on of one power device can cause a false turn-on of the complementary power device. Therefore, the GaN HEMT might be destroyed by the overcurrent and transient heat caused by the short circuit. The most important factor for the false turn-on of GaN HEMTs is its reverse transfer capacitance (Crss), but other parasitic components such as inductances in PCB should be considered to analyze the false turn-on phenomena. In this paper the theoretical analysis of the capacitance components that may cause the false turn-on is conducted. Based on the theoretical analysis, we propose the conditions of the parasitic component of the gate drive circuit to prevent false turn-on.

    DOI: 10.1109/ECCE47101.2021.9595846

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  72. EMI Analysis and Suppression Method Using Ferrite Beads Applied to LLC Converter Reviewed International journal

    Okochi, R; Takatsuji, H; Imaoka, J; Yamamoto, M

    2021 IEEE INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC)     2021

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    To operate the LLC converter at high switching frequency,the excitation current flowing through the transformer is increased,which generates a large conducted noise. The peaks in the noise spectrum are caused by the ringing of the switching node voltage and the resonance of the CM equivalent circuit. In this paper,a method using ferrite beads and additional resistors in combination with the input filter is proposed to suppress the ringing. Its effectiveness in reducing the high-frequency noise while maintaining the fast-switching speed is confirmed by simulation and experiment.

    DOI: 10.1109/IFEEC53238.2021.9661804

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  73. Effects of High-frequency Operation on Magnetic Components in Power Converters Reviewed International coauthorship International journal

    Imaoka, J; Yu-Hsin, W; Shigematsu, K; Aoki, T; Noah, M; Yamamoto, M

    2021 IEEE 12TH ENERGY CONVERSION CONGRESS AND EXPOSITION - ASIA (ECCE ASIA)     page: 978 - 984   2021

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    Compound semiconductor devices such as Gallium Nitride (GaN) and Silicon Carbide (SiC) are actively adopted in power converters to improve power conversion efficiency, downsize passive components and miniaturize cooling systems. However, in the power converters, magnetic components often become bottlenecks in power converters from size, power losses, and temperature rise perspective. Therefore, in some cases, the attractive performance of GaN and SiC cannot be fully utilized due to the limits imposed by magnetic components. To indicate this matter from an experimental perspective, this paper conducts a fundamental investigation of the downsizing effect of magnetic components and temperature rise when varying switching frequency (85 kHz, 150 kHz, 350 kHz, 1 MHz) of a 1 kW boost converter as a case study. As results of experiments, although high-switching frequency operation contributes to downsizing magnetic component effectively, the thermal runaway of the magnetic core while driving at high frequency is confirmed due to downsized small surface area and increasing iron loss due to temperature dependency of Mn-Zn ferrite magnetic cores. For a fair comparison, the area product approach is used in the design procedure for selecting core size. The effect of the high-frequency drive is discussed from theoretical and experimental viewpoints.

    DOI: 10.1109/ECCE-Asia49820.2021.9479365

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  74. 13.56MHz high power half-bridge GaN-HEMT resonant inverter achieving 99% power efficiency

    Oyane A., Senanayake T., Hattori F., Imaoka J., Yamamoto M., Masuda M.

    9th IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2020     2020.12

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    High-power inverters with high frequency have been required for progressing technologies such as wireless power transfer (WPT) and plasma processing. Recently, gallium nitride high electron mobility transistor (GaN-HEMT) is getting lots of attention from the viewpoint of fast switching ability and low power consumption. However, GaN-HEMT inverters are difficult to be operated in over several kW because of its low drain-source breakdown voltage. In other words, the conventional half-bridge GaN-HEMT inverter can output high power only for the small load resistance less than several-O. This paper overcomes this difficulty by implementing an impedance conversion network in the prior stage of the series resonator. The proposed topology realizes not only high-power from low drain-source voltage but also the sine wave output with very low harmonics. 3kW output to 50O load at 13.56MHz is theoretically designed, and verified by computer simulations. And also, the experimental prototype using GaN-HEMTs achieves the high efficiency of 99.43% at 13.56MHz and 471W.

    DOI: 10.1109/PEDES49360.2020.9379451

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  75. Magnetic Design Method for Multi-Material Inductor to Flatten Efficiency Curve of Power Converters within Wide Load Ranges Invited Reviewed

    Ishikura Y, Imaoka J., Noah M., Aoki T, Ito K, Yamamoto M

    IEEE Transactions on Magnetics   Vol. 56 ( 10 ) page: 1 - 8   2020.10

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  76. Magnetic Design Method for Multi-Material Inductor to Flatten Efficiency Curve of Power Converters Within Wide Load Ranges Reviewed International coauthorship International journal

    Ishikura Yuki, Imaoka Jun, Noah Mostafa, Aoki Tatsuya, Ito Koichiro, Yamamoto Masayoshi

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 56 ( 10 )   2020.10

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    DOI: 10.1109/TMAG.2020.3014592

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  77. Output Power Pulsation Suppressed with an Activity Smoothen Buck-Boost Converter to Achieve Electrolytic Capacitor-less AC/DC Converter

    Ou T., Namiki S., Tsuruya M., Noah M., Morita K., Mukaiyama D., Imaoka J., Yamamoto M.

    12th AEIT International Annual Conference, AEIT 2020     2020.9

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    An Activity Smoothen Circuit with bidirectional Buck-Boost Converter (AS-BBC) was approached to smoothen the output power of a power factor correction (PFC) converter, which is an AC/DC converter, without using any electrolytic capacitors in this paper. In order to smoothen the output pulsation current of the PFC converter, electrolytic capacitors have been used generally, since electrolytic capacitors have a large magnitude capacity. However, there is a lifespan to electrolytic capacitors. On the other hand, film capacitors have a semi-permanent lifespan with so much less magnitude capacity than electrolytic capacitors. A way of using the AS-BBC to make a small capacitor work like a large capacitor as a smoothing capacitor to handle the output power is presented in this paper. Approximately 47% of the pulsation output is suppressed with a 4.4μ F film capacitor with the AS-BBC. Since there is no electrolytic capacitor adapted, a semi-permanent lifespan PFC converter is achieved successfully.

    DOI: 10.23919/AEIT50178.2020.9241166

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  78. Temperature Dependency Modeling, Simulation and Experimental Validations of DC Superimposition Characteristics for Gapped-Ferrite Inductor Including Saturation Region

    Imaoka J., Aoki T., Shigematsu K., Yamamoto M.

    IEEE International Symposium on Industrial Electronics   Vol. 2020-June   page: 1466 - 1473   2020.6

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    To realize the early development of power converters, research on the front-loading design in which the efficiency, control characteristics, converter size, thermal management, and Electromagnetic Compatibility (EMC) are carefully considered before making a prototype, has been attracting. To carefully design and predict these design factors before prototyping, making accurate models of active/passive components operated on simulation of the multi-physical domain such as thermal, magnetic, and electrical is indispensable. This is because these characteristics of active/passive components on power converters are affected by each other. In this background, this paper proposes a nonlinear relative permeability modeling method with a temperature dependency of gapped-ferrite cores. The temperature dependency of the effective relative permeability of the gapped-ferrite core is investigated under core temperature within-50°C-+ 150°C. As features of the proposed modeling method and simulation model, a simple mathematical equation and lookup tables are utilized for simple implementation to the simulator. The validity of the proposed modeling method is confirmed by both simulation and experimental tests under operating conditions including the magnetic saturation regions.

    DOI: 10.1109/ISIE45063.2020.9152521

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  79. Analysis of Common Mode Noise Reduction Mechanism in A Shielded Inductor

    Sasaki M., Imaoka J., Yamamoto M., Nakano A., Fuse K.

    IEEE International Symposium on Industrial Electronics   Vol. 2020-June   page: 660 - 665   2020.6

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    To achieve high power density, a power converter circuit is often operated at high frequency, and fast switching devices are also combined to reduce switching loss. On the other hand, both high frequency and fast switching greatly increases conductive noise amplitude at frequency over several megahertz. Therefore, electromagnetic compatibility (EMC) is necessary for a high power density converter. However, an additional filter, which consists of large and heavy passive elements, greatly degrades power density. Thus, in this paper, a noise reduction method for noise at frequency band over 10 MHz with small volume increase is presented and investigated. Consequently, the simulation and experimental result verifies that the proposed method decreases MHz-band noise with small volume increase.

    DOI: 10.1109/ISIE45063.2020.9152408

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  80. Comparison of switching performance between GaN and SiC MOSFET via 13. 56MHz Half-bridge Inverter

    Xiong Y., Oyane A., Ou T., Thilak S., Imaoka J., Yamamoto M.

    IEEE International Symposium on Industrial Electronics   Vol. 2020-June   page: 672 - 676   2020.6

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    Both silicon-carbide (SiC) and gallium-nitride (GaN) are wide bandgap power transistor which are developing rapidly. They are able to be used as the main switches in the high-frequency power conversion systems successfully. These high-frequency switches just meet the high demand of low-size power electronics device in recent years. As the high-frequency system always relies on the switches, we designed and made evaluation boards for both SiC and GaN switches by 13. 56MHz half-bridge inverter. Both simulation and experimental results show that GaN achieved more successfully switching, which made good output waveform with very short dead-time. And in simulation, lower switching loss of GaN is also confirmed. As all above, it is obvious that GaN device is more suitable for high-frequency application.

    DOI: 10.1109/ISIE45063.2020.9152253

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  81. Technical Trend of Power Electronics Systems for Automotive Applications Invited Reviewed

    Yamamoto M., Kakisaka T, Imaoka J

    Japanese Journal of Applied Physics   Vol. 59 ( SG ) page: 0805-1 - 0805-13   2020.4

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  82. 多段FET駆動技術を用いた双方向コンバータ Invited Reviewed

    石倉祐樹 ,細谷達也, 山本 真義

    電子情報通信学会論文誌 B   Vol. J103-B ( No.4 ) page: .154 - 161   2020.4

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  83. Technical trend of power electronics systems for automotive applications Reviewed International journal

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59   2020.4

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  84. Bidirectional Converter Using Multi-stage FET Driving Technique

    ISHIKURA Yuki, HOSOTANI Tatsuya, YAMAMOTO Masayoshi

      Vol. J103-B ( 4 ) page: 154 - 161   2020.4

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    Language:Japanese  

    This paper presents a bidirectional converter using by multi-stage FET driving technique. The proposed converter is constructed by implementing series connected low voltage Si-FETs in multi-stage. A driving circuit using multi-stage driving technique can drive series connected FETs from the one power supply without any isolated power supplies and high voltage process ICs. In addition, the balancing capacitors which constructed the converter have voltage averaging function in drain-source voltage to tackle the voltage unbalance between the series connected FETs. Using the figure of merit which can estimate converter losses from the specification of power devices, the usefulness of the circuit configuration which using low voltage Si-FETs instead of SiC-FETs is shown. The effect of the voltage averaging function by the balancing capacitors, the operating principle of the driving circuit and the power conversion mechanism are clarified and presented using the circuit simulator and a converter equivalent circuit. The experimental results show that the proposed driving technique allows the bidirectional converter to achieve a maximum power conversion efficiency of 99.2%.

    DOI: 10.14923/transcomj.2019jbp3022

    CiNii Research

  85. Bidirectional Converter with Multi-stage FETs Featuring Voltage Balance Control Function Using Variable Capacitors

    Ishikura Yuki, Hosotani Tatsuya, Yamamoto Masayoshi

    IEEJ Transactions on Industry Applications   Vol. 140 ( 3 ) page: 168 - 174   2020.3

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    <p>This paper presents a bidirectional converter with multi-stage FETs featuring voltage balance control function using variable capacitors. The proposed converter is constructed using low-voltage Si-FETs in a series connection, and it improves the voltage balance between the drain-source voltages of the series connected FETs in the OFF period. Using the converter figure of merit (FOM), which can estimate the converter losses from the specifications of the FETs, the effectiveness of the proposed converter is compared to that of a converter using SiC-FETs. The factors of the voltage unbalance are analytically clarified using the equivalent circuit. The principle of voltage balance control function using the variable capacitor is discussed. The experimental results show that the proposed converter can achieve a maximum power conversion efficiency of 99.2%.</p>

    DOI: 10.1541/ieejias.140.168

    Scopus

    CiNii Research

  86. Voltage Balancing Control Method Using Variable Capacitors with Simple Turn-on Adjusting Function for Multi-Stage FET Bidirectional Converter

    Ishikura Y., Hosotani T., Noah M., Imaoka J., Yamamoto M.

    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC   Vol. 2020-March   page: 2944 - 2949   2020.3

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    This paper proposes a voltage balancing control method using variable capacitors with simple turn-on adjusting function for multi-stage FET bidirectional converter. The proposed voltage balancing control circuit is composed of a feedback circuit using photocouplers and a delay circuit using variable capacitors with turn-on adjusting diodes. The proposed voltage balancing circuit can reduce the drain-source voltage unbalance which occur during the turn-on and turn-off period of series-connected FETs. The theoretical discussion includes analyzing the unbalanced drain-source voltage in seriesconnected FETs using a simplified converter. Also, the principal of the proposed voltage balancing control method is clarified. The experimental results show that the proposed voltage balancing control method can reduce the drain-source voltage difference Δvds of series-connected FETs from 36 V to 11 V (69% reduction in Δvds) during the turn-off and from 22 V to 11 V (50% reduction in Δvds) during the turn-on period. The multistage FET bidirectional converter can achieve a maximum power conversion efficiency of 99.2%.

    DOI: 10.1109/APEC39645.2020.9124221

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  87. Effects of Secondary Leakage Inductance on the LLC Resonant Converter Reviewed International coauthorship International journal

    Noah Mostafa, Shirakawa Tomohide, Umetani Kazuhiro, Imaoka Jun, Yamamoto Masayoshi, Hiraki Eiji

    IEEE TRANSACTIONS ON POWER ELECTRONICS   Vol. 35 ( 1 ) page: 835 - 852   2020.1

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    DOI: 10.1109/TPEL.2019.2911093

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  88. Acute Pain Intensity After Collagenase Clostridium histolyticum Injection in Patients With Dupuytren Contracture

    Noto K., Yamamoto M., Iwatsuki K., Kurimoto S., Tatebe M., Hirata H.

    Journal of Hand Surgery Global Online   Vol. 2 ( 1 ) page: 16 - 20   2020.1

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    Purpose: To investigate multidimensional pain intensity and quality after collagenase Clostridium histolyticum (CCH) injection in patients with Dupuytren contracture using a pain visual analog scale (VAS) and the revised version of the Short-Form McGill Pain Questionnaire (SF-MPQ-2). Methods: This prospective observational study was carried out from 2015 to 2017. As a primary end point, patients completed the pain VAS (range, 0 [no pain] to 100) and SF-MPQ-2 before and after CCH injection; 3, 9, and 24 hours after CCH injection; after the extension procedure; and 3 and 7 days after CCH injection. In addition, they reported the dose and duration of supplementary analgesic use during this period. Results: A total of 41 patients were enrolled in this study (51 joints). Mean pain VAS score (mean ± SD, 34 ± 21) was maximal 9 hours after CCH injection and decreased within the following 7 days. The total score of the SF-MPQ-2 significantly increased after CCH treatment and decreased in the 7 days after the injection. Among the SF-MPQ-2 subscales, the highest and lowest scores after CCH injection were recorded for continuous pain and affected descriptors, respectively. Nonsteroidal anti-inflammatory drugs were most frequently self-administered during 7 days after the extension procedure compared with any other study period. Conclusions: The pain VAS and SF-MPQ-2 revealed acute pain after CCH injection. However, all examined pain aspects dramatically improved within 7 days after injection. Pain after CCH injection is characterized by low scores in the Affective Descriptors subscale of the SF-MPQ-2. Type of study/level of evidence: Prognostic Ⅳ.

    DOI: 10.1016/j.jhsg.2019.10.004

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    PubMed

  89. A simple gate driver design for GaN-based switching devices with improved surge voltage and switching loss at 1-MHz operation Invited Reviewed

    Shota Jodo, Toshihiro Iwaki, Kosuke Uchiyama, Md. Islam, Kensuke Kataoka, Yuki Hayasaka, Jun Imaoka, Masayoshi Yamamoto, Kiichi Niitsu

    Japanese Journal of Applied Physics   Vol. No. 60 ( SADD02 ) page: SAAD02-1 - SAAD02   2020

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  90. Analysis of Common Mode Noise Reduction Mechanism in A Shielded Inductor

    Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi, Nakano Akira, Fuse Koji

    2020 IEEE 29TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)     page: 660 - 665   2020

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  91. Voltage Balancing Control Method Using Variable Capacitors with Simple Turn-on Adjusting Function for Multi-Stage FET Bidirectional Converter

    Ishikura Yuki, Hosotani Tatsuya, Noah Mostafa, Imaoka Jun, Yamamoto Masayoshi

    2020 THIRTY-FIFTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2020)     page: 2944 - 2949   2020

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    Web of Science

  92. Temperature Dependency Modeling, Simulation and Experimental Validations of DC Superimposition Characteristics for Gapped-Ferrite Inductor Including Saturation Region

    Imaoka Jun, Aoki Tatsuya, Shigematsu Koichi, Yamamoto Masayoshi

    2020 IEEE 29TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)     page: 1466 - 1473   2020

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  93. Comparison of switching performance between GaN and SiC MOSFET via 13.56MHz Half-bridge Inverter

    Xiong Yi, Oyane Aoi, Ou Tengfei, Thilak Senanayake, Imaoka Jun, Yamamoto Masayoshi

    2020 IEEE 29TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)     page: 672 - 676   2020

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  94. Energy Management Storage System with a Multi-stage FET Bidirectional Converter

    Ishikura Yuki, Hosotani Tatsuya, Yamamoto Masayoshi

    Journal of the Japan Institute of Power Electronics   Vol. 46 ( 0 ) page: 44 - 50   2020

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    This paper presents an energy management storage system with a multi-stage FET bidirectional converter. The
    proposed system is constructed by a bidirectional converter using series connected FETs, and it realizes highly energy management that maximizes battery performance. By calculating the power loss using the converter performance index FOM (Figure of merit), it is shown that the proposed configuration can be possible to reduce the power loss 70% compared to the conventional configuration. In the proposed system, using a power control method that reduces the charging current, the battery charging losses can be reduced 60%. The analysis results show that the proposed system can achieve a charging energy efficiency of 96.9%, and reduce the yearly CO2 emission of 33%.

    DOI: 10.5416/jipe.46.44

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  95. Dielectric Characteristics Analysis of Aluminum Electrolytic Capacitors Based on Linear Response Function Reviewed International journal

    Mukaiyama Daisaku, Yamamoto Masayoshi

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   Vol. 166 ( 16 ) page: E554 - E563   2019.12

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  96. Modeling, Magnetic Design, Simulation Methods, and Experimental Evaluation of Various Powder Cores Used in Power Converters Considering Their DC Superimposition Characteristics Reviewed International coauthorship International journal

    Imaoka Jun, Okamoto Kenkichiro, Shoyama Masahito, Ishikura Yuki, Noah Mostafa, Yamamoto Masayoshi

    IEEE TRANSACTIONS ON POWER ELECTRONICS   Vol. 34 ( 9 ) page: 9033 - 9051   2019.9

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    DOI: 10.1109/TPEL.2018.2886044

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  97. Comprehensive Analysis of Coupled Inductors with Powder Cores Used in Interleaved Converter: Measurement, Modeling, Design Methods, and Experimental Evaluation

    Aoki T., Imaoka J., Yamamoto M., Yoshimoto K.

    Proceedings of the International Conference on Power Electronics and Drive Systems   Vol. 2019-July   2019.7

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    One of the best techniques for downsizing power converters is to use coupled inductors in multiphase circuits. Meanwhile, from a magnetic material perspective, powder core material is well known as an attractive magnetic material with superior features such as high saturation flux density. However, since the relative permeability of power cores depends on the magnetic field intensity, designing coupled inductors is difficult, and the modeling method is not well discussed in the relevant literature. The purpose of this research is to model coupled inductors with powder cores and present a simple magnetic design method. A model of coupled inductors is created by a novel measurement method of the dc superimposition characteristic unique to the coupled inductor of two-phase interleaved circuits. Furthermore, a design method based on a theoretical analysis using a magnetic circuit model had been established. The validity and effectiveness of the proposed methods are confirmed from simulation and experimental tests. This research is helpful in the field of the model-based development of coupled inductors.

    DOI: 10.1109/PEDS44367.2019.8998883

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  98. Effects of secondary leakage inductance on the LLC resonant converter - Part II: Frequency control bandwidth with respect to load variation

    Noah M., Shirakawa T., Umetani K., Imaoka J., Yamamoto M., Hiraki E.

    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC   Vol. 2019-March   page: 1408 - 1414   2019.5

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    Resonant converters rely on a precise knowledge of leakage inductance of the equipped transformers. Resonant circuit topologies such as LLC usually utilize the transformer leakage as an inductive component in the resonant tank, allowing for a drastic reduction in the converter weight, size and volume. The existence of the secondary leakage inductance affects the whole operation of the LLC resonant converter. This paper reveals that placing the secondary winding near the air gap would increase the resonant tank input impedance, vertically shrink the voltage-gain curve of the converter, and consequently minimize the frequency range (i.e frequency bandwidth with respect to load variation). On contrary, placing the secondary winding in a close contact with the magnetic core would decrease the resonant tank input impedance, vertically stretches the voltage-gain curve of the converter, and widen the frequency variation range. It has been reported that the winding location with respect to the air gap has an impact on the leakage inductance value. In other words, placing the secondary winding in a close contact with the magnetic core (zero mmf position) would maximize the leakage energy storage originated from the secondary winding, and hence maximize the secondary leakage inductance and vice versa. The theoretical discussion is presented which is merely based on Ampere's law and Dowell's model. Furthermore, transformer prototypes had been constructed and tested in a 390V/12V-220W LLC converter prototype to evaluate the proposed analysis.

    DOI: 10.1109/APEC.2019.8722190

    Scopus

  99. Effects of secondary leakage inductance on the LLC resonant converter - Part i: Transformer voltage gain and efficiency

    Noah M., Shirakawa T., Umetani K., Imaoka J., Yamamoto M., Hiraki E.

    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC   Vol. 2019-March   page: 780 - 786   2019.5

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    Minimizing the transformer magnetizing inductance is essential for the soft switching operation of the LLC resonant converter, despite the fact that it results in higher values of magnetizing current, which deteriorates the converter efficiency. Furthermore, it is a well-known practice to utilize the transformer leakage as an inductive component in the resonant tank to improve the power destiny. This paper reveals that the transformer voltage gain can be improved when the transformer leakage inductance in concentrated on the secondary side to avoid the voltage drop inflicted by the relatively large value of the magnetizing current (im), especially at light load condition. The theoretical discussion relies on the asymmetry of the EI core by placing the secondary winding in a close contact with the magnetic core and placing the primary winding in the vicinity of the air gap. Moreover, noise absorber had been utilized to control the leakage inductance value. The proposed transformer design maximizes the value of the secondary leakage inductance and minimizes the primary leakage inductance. Alongside with the theoretical discussion, experimental tests had been conducted to evaluate the proposed method using a 390V-12V, 220W LLC resonant converter.

    DOI: 10.1109/APEC.2019.8721980

    Scopus

  100. Bidirectional Converter with Balancing Capacitor using Multi-stage FET Driving Technique

    Ishikura Y., Imaoka J., Noah M., Yamamoto M.

    2019 IEEE 3rd International Conference on DC Microgrids, ICDCM 2019     2019.5

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    This paper proposes a bidirectional converter with balancing capacitor using multi-stage FET driving technique. The proposed converter is constructed by implementing series-connected low voltage Si-FETs in multi-stages. The balancing capacitor can average the applied voltage on FETs in the transient state of the switching operation and tackle the voltage unbalance between the series-connected FETs. The proposed driving circuit is using multi-stage FET driving technique and can drive all the series-connected FETs using only one power supply. The effect of the balancing capacitor and the proposed driving technique are clarified and presented using the circuit simulator and the converter equivalent circuit. The proposed topology improves the converter power conversion efficiency. The experimental results show that the proposed driving technique allows the bidirectional converter to achieve a maximum power conversion efficiency of 99.2%.

    DOI: 10.1109/ICDCM45535.2019.9232896

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  101. Cooperative Control of Multi-Input Modular DC/DC Converter for Electric Off-Highway Vehicles

    Piao Q., Konoto M., Kakisaka T., Imaoka J., Yamamoto M.

    2019 IEEE 3rd International Conference on DC Microgrids, ICDCM 2019     2019.5

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    This paper proposes a cooperative control used in a power conversion system consists of several energy sources and modular DC/DC converters. The proposed cooperative control method has attractive features of realizing constant dynamic characteristics even when each input voltage fluctuates or in case of the output power of each input voltage source is limited. The proposed cooperative control method has dual control loops with current control as an inner loop and voltage control as the outer loop. In addition, feed-forward control of the input voltage and the compensators for each control loop are implemented to suppress the influence of input voltage fluctuation or power capacity limit on dynamic characteristics. The effectiveness of the proposed control is validated by simulation test.

    DOI: 10.1109/ICDCM45535.2019.9232868

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  102. Magnetic Design Method for Multi-Material Powder Core Inductor to Improve Efficiency of Bidirectional DC/DC Converter within Wide Load Range

    Imaoka J., Ishikura Y., Ito K., Aoki T., Noah M., Yamamoto M.

    ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia     2019.5

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    Publisher:ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia  

    Utilizing powder cores in many power electronics applications have been gaining much attention due to their attractive magnetic properties. However, it is quite challenging for the circuit designer to choose the proper core, as there are many kinds of magnetic powder cores available in the market. Therefore, due to the limitation of a single magnetic material property, it is often difficult to realize high power conversion efficiency within wide load ranges, including light and heavy load conditions. This paper proposes a novel design method of the multi-material inductor which combines multiple powder cores having different material properties. The aim of this work is to provide improved efficiency over the entire load range of power converters. The experimental results have proven that the inductor with multi-material powder cores can improve the efficiency over wide load range. The validity and effectiveness of the proposed magnetic design method are confirmed from theoretical analysis, simulation and experimental tests.

    Scopus

  103. 東海支部における地域貢献活動紹介

    山本 真義

    電気学会誌   Vol. 139 ( 4 ) page: 244 - 244   2019.4

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    Language:Japanese   Publisher:一般社団法人 電気学会  

    <p>はじめに</p><p>電気学会東海支部としては,学術講演会,講習会,見学会,サイエンスセミナーなどの諸行事を開催し,学会活動の一層のオープン化を目指している。今回はそういった地域貢</p>

    DOI: 10.1541/ieejjournal.139.244

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  104. Introduction: Applications Roadmap of GaN Power Semiconductor Devices

    YAMAMOTO Masayoshi

    The Journal of The Institute of Electrical Engineers of Japan   Vol. 139 ( 2 ) page: 76 - 79   2019.2

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    DOI: 10.1541/ieejjournal.139.76

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  105. Comparative Evaluation of Electrical and Calorimetric Methods to Estimate Core Loss in Powder Cores

    Ishikura Yuki, Imaoka Jun, Noah Mostafa, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. 8 ( 3 ) page: 386 - 393   2019

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    <p>The utilization of powder cores for many power electronic applications has drawn a significant amount of attention owing to their attractive magnetic properties. However, because of their low relative permeability characteristics, a precise measurement of the core loss is very difficult to obtain. Imprecise estimation of the core loss may lead to an inaccurate thermal design of power converters. Measuring and calculating the accurate value of the core loss allows the circuit designer to design a more efficient system. This paper discusses the revalidation of electrical measurement by comparing the electrical method with the calorimetric method in powder cores. The calorimetric method is one of the most promising methods to accurately measure the core loss; however, it is time consuming. A difference less than 10% has been reported for the core loss measurement error while comparing the electrical method and the calorimetric method in various conditions. These results indicate that the electrical method using the B-H analyzer is effective for measuring the core losses in some conditions for powder cores. Along with the theoretical discussion, simulation and experimental tests are also conducted.</p>

    DOI: 10.1541/ieejjia.8.386

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    CiNii Research

  106. Study on the Imbalanced Voltage of Series-connected Active Power Semiconductor Devices in Power Conversion Systems

    Zhang Hongjing, Imaoka Jun, Noah Mostafa, Ishikura Yuki, Yamamoto Masayoshi

    2019 IEEE WORKSHOP ON WIDE BANDGAP POWER DEVICES AND APPLICATIONS IN ASIA (WIPDA ASIA 2     2019

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  107. Magnetic Design Method for Multi-Material Powder Core Inductor to Improve Efficiency of Bidirectional DC/DC Converter within Wide Load Range Reviewed International coauthorship International journal

    Imaoka J., Ishikura Y., Ito K., Aoki T., Noah M., Yamamoto M.

    2019 10TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND ECCE ASIA (ICPE 2019 - ECCE ASIA)     2019

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    DOI: 10.23919/icpe2019-ecceasia42246.2019.8797162

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  108. Effects of Secondary Leakage Inductance on the LLC Resonant Converter-Part II: Frequency Control Bandwidth with respect to Load Variation Reviewed International coauthorship International journal

    Noah Mostafa, Shirakawa Tomohide, Umetani Kazuhiro, Imaoka Jun, Yamamoto Masayoshi, Hiraki Eiji

    THIRTY-FOURTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2019)     page: 1408 - 1414   2019

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  109. Effects of Secondary Leakage Inductance on the LLC Resonant Converter-Part I: Transformer Voltage Gain and Efficiency Reviewed International coauthorship International journal

    Noah Mostafa, Shirakawa Tomohide, Umetani Kazuhiro, Imaoka Jun, Yamamoto Masayoshi, Hiraki Eiji

    THIRTY-FOURTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2019)     page: 780 - 786   2019

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  110. Comprehensive Analysis of Coupled Inductors with Powder Cores Used in Interleaved Converter: Measurement, Modeling, Design Methods, and Experimental Evaluation

    Aoki Tatsuya, Imaoka Jun, Yamamoto Masayoshi, Yoshimoto Kosuke

    2019 IEEE 13TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS (PEDS)     2019

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    Web of Science

  111. Bidirectional Converter with Balancing Capacitor using Multi-stage FET Driving Technique

    Ishikura Yiki, Imaoka Jun, Noah Mostafa, Yamamoto Masayoshi

    2019 IEEE THIRD INTERNATIONAL CONFERENCE ON DC MICROGRIDS (ICDCM)     2019

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    Language:Japanese  

    Web of Science

  112. Cooperative Control of Multi-Input Modular DC/DC Converter for Electric Off-Highway Vehicles

    Piao Qingyun, Konoto Masaaki, Kakisaka Tasuku, Imaoka Jun, Yamamoto Masayoshi

    2019 IEEE THIRD INTERNATIONAL CONFERENCE ON DC MICROGRIDS (ICDCM)     2019

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    Language:Japanese  

    Web of Science

  113. Common Mode Conductive Noise Cancellation for Multiphase Converter Using Auxiliary Winding

    Sasaki Mamoru, Imaoka Jun, Yamamoto Masayoshi, Nakano Akira, Fuse Koji

    2019 IEEE THIRD INTERNATIONAL CONFERENCE ON DC MICROGRIDS (ICDCM)     2019

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    Web of Science

  114. A Novel Transformer Structure Used in a 1.4 MHz LLC Resonant Converter with GaNFETs

    Ou T., Noah M., Morita K., Tsuruya M., Namiki S., Imaoka J., Yamamoto M.

    Proceedings - 2018 IEEE International Power Electronics and Application Conference and Exposition, PEAC 2018     2018.12

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    Publisher:Proceedings - 2018 IEEE International Power Electronics and Application Conference and Exposition, PEAC 2018  

    A novel integrated magnetic structure suitable for a high-frequency switching current resonant converter (LLC) with GaNFETs is proposed in this paper. Creating a leakage inductance to resonate with a capacitor, and the mutual inductance in an LLC resonant converter is the most common solution. However, the volume of leakage inductance is very difficult to be controlled or adjusted. Furthermore, the losses may increase when the leakage fluxes cross the patterns on the PCB board or the primary and secondary coils. In order to tackle this problem, a new magnetic structure core is proposed in this paper. The proposed magnetic structure can decrease the losses of the core, which means the magnetic structure proposed in this paper can improve the efficiency of the converter. A power density of approximately 2.6 W/cm 3 has been realized for the 1.4-MHz LLC resonant converter with the proposed magnetic structure with a maximum efficiency of 96.4%. Along with the theoretical discussion, finite element analysis (FEA) electromagnetic simulation and experimental results are also presented.

    DOI: 10.1109/PEAC.2018.8590446

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  115. Fundamental Experiment of 3-phase Electric Resonant Coupling Wireless Power Transfer Reviewed International journal

    Hattori F., Imaoka J., Yamamoto M., Masuda M.

    7th International IEEE Conference on Renewable Energy Research and Applications, ICRERA 2018     page: 1417 - 1422   2018.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:7th International IEEE Conference on Renewable Energy Research and Applications, ICRERA 2018  

    Lots of researches of electric coupling is performed for wireless power transfer system. For achieving high power transfer, electric resonant coupling is used. A 3-phase electric resonant coupling is one option for higher power wireless transfer. However, as far as the author knows, much less work has been done for a 3-phase electric resonant coupling. In this paper, fundamental experiment of a 3-phase electric resonant coupling wireless power transfer is performed. From experiment results, the possibility that 3-phase electric resonant coupling can be used for wireless power transfer has been found.

    DOI: 10.1109/ICRERA.2018.8566938

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  116. Magnetic Design and Experimental Evaluation of a Commercially Available Single Integrated Transformer in Three-Phase LLC Resonant Converter Reviewed International coauthorship International journal

    Noah Mostafa, Kimura Shota, Imaoka Jun, Martinez Wilmar, Endo Shun, Yamamoto Masayoshi, Umetani Kazuhiro

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   Vol. 54 ( 6 ) page: 6190 - 6204   2018.11

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    DOI: 10.1109/TIA.2018.2856631

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  117. Core Loss Evaluation in Powder Cores: A Comparative Comparison between Electrical and Calorimetric Methods

    Ishikura Y., Imaoka J., Noah M., Yamamoto M.

    2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018     page: 1087 - 1094   2018.10

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    Utilizing powder cores in many power electronics applications have gained interest due to the attractive magnetic properties of powder core materials. For instance, powder cores have soft saturation characteristics and high saturation flux density compared to gapped ferrites. However, due to their low relative-permeability and the low loss characteristics, a precise measurement of the core losses is very difficult to be obtained. One of the common approaches to measure core losses is by measuring the electrical signals of the winding terminals, we hereafter refer it as electrical methods. Another alternative approach is calorimetric methods, which rely on measuring the core temperature rise. Nonetheless, these methods may have huge measurement error in case of powder cores. This paper evaluates the accuracy of measuring core losses in powder cores, and a comparison between the electrical and calorimetrical methods is presented. Along with the theoretical discussion, simulation and experimental tests are conducted.

    DOI: 10.23919/IPEC.2018.8508012

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  118. Multiple Exciting Voltage Control for Maximization of Multi-hop Wireless Power Transfer Efficiency

    Sasaki M., Yamamoto M.

    2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018     page: 3344 - 3348   2018.10

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    Recently multi-hop wireless power transfer (WPT) systems for the area extension of a wireless battery charging have been addressed by several research groups. This paper describes a discrete exciting voltage control technique for the multi-hop WPT system via magnetic resonant coupling which can maximize the power transfer efficiency in response to the change of coupling status. The theory allows the equations of the wireless power transfer efficiency of the system to be determined at all the ratio of the mutual inductance. The calculated results are included to confirm the advantage to single transmitting multi-hop WPT systems.

    DOI: 10.23919/IPEC.2018.8508026

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  119. Modeling, Magnetic Design, and Simulation Methods Considering DC Superimposition Characteristic of Powder Cores Used in Power Converters

    Imaoka J., Okamoto K., Shoyama M., Ishikura Y., Noah M., Yamamoto M.

    2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018     page: 1095 - 1102   2018.10

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    Publisher:2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018  

    Powder cores have been gained much attention as one of the attractive magnetic cores used in power converters due to their superior features such as high saturation flux density or distributed air gaps. However, powder cores have a unique feature that the relative permeability of the magnetic core varies depending on the magnetic field intensity. However, modeling the variable relative permeability, the design method for powder cores, and computer simulation methods of non-linear inductance are well not discussed in the related literature. Therefore, this paper proposes a novel modeling, magnetic design methods, and simulation technique considering dc superimposition characteristics of powder cores. The modeling method uses a novel model equation representing the behavior of relative permeability under the dc current superimposition condition, which is helpful to evaluate the performance of powder cores and to properly design various magnetic components. Theoretical analysis has been presented and the effectiveness and the validity of the proposed methods are evaluated through simulation and experimental tests.

    DOI: 10.23919/IPEC.2018.8507874

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  120. GaN半導体研究拠点としての名古屋における活動紹介

    山本 真義

    電気学会誌   Vol. 138 ( 10 ) page: 695 - 695   2018.10

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    Language:Japanese   Publisher:一般社団法人 電気学会  

    <p>2014年の赤﨑勇終身教授(名城大学),天野浩教授(名古屋大学),中村修二教授(カリフォルニア大学)の3名へのノーベル物理学賞受賞のインパクトからも分かるとお</p>

    DOI: 10.1541/ieejjournal.138.695

    CiNii Research

  121. Effect of inductor parasitic resistances on the voltage gain of high step-up DC-DC converters for electric vehicle applications

    Martinez Wilmer, Cortes Camilo, Yamamoto Masayoshi, Imaoka Jun

    IET POWER ELECTRONICS   Vol. 11 ( 10 ) page: 1628 - 1639   2018.8

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  122. Review of Current Balance Mechanism in Multiphase LLC Resonant Converters

    Noah M., Imaoka J., Ishikura Y., Umetani K., Yamamoto M.

    IEEE International Symposium on Industrial Electronics   Vol. 2018-June   page: 1030 - 1036   2018.8

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    Language:Japanese   Publisher:IEEE International Symposium on Industrial Electronics  

    In multi-phase power conversion circuits, achieving an equalized current sharing between the paralleled modules is a challenge. Especially, in the LLC resonant converter topology, where the voltage gain is very sensitive to a minor change in the resonant tank parameters. In practical applications, the resonant tank parameters are never exactly identical among the phases, leading to unbalanced current sharing between the paralleled modules. This paper reviews the state of the art of current balance mechanisms proposed previously in the literature and revisits a newly proposed method to improve the current balance, which relies on a single balancing transformer connected in series with the paralleled resonant tanks. A comparison between the proposed method and connecting the three transformers in star is conducted. While evaluating the current balancing methods, the following sources of unbalance have been considered: a) resonant and magnetizing inductances b) resonant capacitors. c) on-resistances of the switching devices. d) propagation delay of the gate drivers.

    DOI: 10.1109/ISIE.2018.8433827

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  123. Oscillation analysis and current peak reduction in paralleled SiC MOSFETs

    Nanamori Kimihiro, Sugihara Yusuke, Yamamoto Masayoshi

    IET CIRCUITS DEVICES & SYSTEMS   Vol. 12 ( 4 )   2018.7

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    DOI: 10.1049/iet-cds.2017.0255

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  124. Ankle–brachial pressure index as a predictor of the 2-year outcome after transcatheter aortic valve replacement: data from the Japanese OCEAN-TAVI Registry

    Yamawaki M., Araki M., Ito T., Honda Y., Tokuda T., Ito Y., Ueno H., Mizutani K., Tabata M., Higashimori A., Tada N., Takagi K., Yamanaka F., Naganuma T., Watanabe Y., Yamamoto M., Shirai S., Hayashida K.

    Heart and Vessels   Vol. 33 ( 6 ) page: 640 - 650   2018.6

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    Peripheral artery disease plays a pivotal role for access site selection in transcatheter aortic valve replacement (TAVR). Abnormal ankle–brachial index (ABI) is a generalized mortality marker in many cardiovascular scenarios. However, the long-term outcomes in high-risk TAVR populations remain unclear. We investigated the association between low ABI and 2-year outcome after TAVR. Of 1613 patients enrolled in the OCEAN-TAVI registry, 1458 (90.4%) who underwent ABI before TAVR were divided into groups: patients with (1) ABI ≥ 0.9 in both legs and (2) ABI < 0.9 in either leg. Primary endpoint was all-cause death within 2 years. ABI < 0.9 was noted in 304 patients (20.8%). ABI < 0.9-group had more frequent and severe comorbidities. Primary endpoint in ABI < 0.9-group was significantly higher than that in ABI ≥ 0.9-group (15.8 vs. 8.7%, p < 0.001). This trend continued in the transfemoral (TF)-approach (14.9 vs. 7.5%, p < 0.001), but not in the alternative approach (17.2 vs. 15.8%, p = 0.815). Within 30 days, ABI < 0.9-group had a higher cardiac death rate (3.1 vs. 1.0%, p = 0.033), whereas between 31 days and 2 years, non-cardiovascular death was more frequently observed (9.2 vs. 5.1%, p = 0.003). In ABI < 0.9-group, in-hospital vascular complications (11.9 vs. 4.9%, p < 0.001) and acute kidney injury (10.8 vs, 5.7%, p = 0.009) were more frequently found when using the transfemoral-approach. In multivariate analysis, ABI < 0.9 was an independent predictor of 2-year mortality (adjusted hazard ratio 1.495, 95% CI 1.007–2.220, p = 0.046). Pre-procedure ABI < 0.9 is a useful prognostic marker for all-cause mortality, even in high-risk TAVR populations.

    DOI: 10.1007/s00380-017-1096-y

    Scopus

  125. A Current Sharing Method Utilizing Single Balancing Transformer for a Multiphase LLC Resonant Converter With Integrated Magnetics Reviewed International coauthorship International journal

    Noah Mostafa, Endo Shun, Ishibashi Hiroki, Nanamori Kimihiro, Imaoka Jun, Umetani Kazuhiro, Yamamoto Masayoshi

    IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS   Vol. 6 ( 2 ) page: 977 - 992   2018.6

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    Language:Japanese   Publisher:IEEE Journal of Emerging and Selected Topics in Power Electronics  

    Integrated magnetics is applied to replace the three-discrete transformers by a single core transformer in a three-phase LLC resonant converter. The magnetic circuit of the integrated transformer is analyzed to derive coupling factors between the phases; these coupling factors are intentionally minimized to realize the magnetic behavior of the three-discrete transformers, with the benefit of eliminating the dead space between them. However, in a practical design, the transformer parameters in a multiphase LLC resonant converter are never exactly identical among the phases, leading to unbalanced current sharing between the paralleled modules. In this regard, a current balancing method is proposed in this paper. The proposed method can improve the current sharing between the paralleled phases relying on a single balancing transformer, and its theory is based on Ampere's law, by forcing the sum of the three resonant currents to zero. Theoretically, if an ideal balancing transformer has been utilized, it would impose the same effect of connecting the integrated transformer in a solid star connection. However, as the core permeability of the balancing transformer is finite, the unbalanced current cannot be completely suppressed. Nonetheless, utilizing a single balancing transformer has an advantage over the star connection, as it keeps the interleaving structure simple which allows for traditional phase-shedding techniques, and it can be a solution for the other multiphase topologies where realizing a star connection is not feasible. Along with the theoretical discussion, simulation and experimental results are also presented to evaluate the proposed method considering various sources of the unbalance such as a mismatch in: 1) resonant and magnetizing inductances; 2) resonant capacitors; 3) transistor on-resistances of the MOSFETS; and 4) propagation delay of the gate drivers.

    DOI: 10.1109/JESTPE.2017.2777508

    Web of Science

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  126. A Magnetic Design Method Considering DC-Biased Magnetization for Integrated Magnetic Components Used in Multiphase Boost Converters Reviewed International coauthorship International journal

    Imaoka Jun, Okamoto Kenkichiro, Kimura Shota, Noah Mostafa, Martinez Wilmar, Yamamoto Masayoshi, Shoyama Masahito

    IEEE TRANSACTIONS ON POWER ELECTRONICS   Vol. 33 ( 4 ) page: 3346 - 3362   2018.4

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    High power density and high efficiency in dc/dc converters are required in various applications such as the automotive application. Interleaved multiphase circuits with integrated magnetic components can fulfill these requirements because passive components occupying significant space in power converters can be downsized without high-switching frequency driving of power devices. However, dc-biased magnetization is a drawback of integrated magnetic components because of unbalanced inductor average currents. This imbalance arises from the tolerance among the phase components. To overcome this problem, inductor average current control is implemented in interleaved multiphase dc/dc converters. Nevertheless, the imbalance cannot be completely eliminated because the current sensors inserted into each phase have gain errors. The purpose of this paper is to present a magnetic design method to improve the immunity to unbalanced currents. A comprehensive analysis is carried out with two main objectives: to prevent magnetic saturation, which may arise due to the current unbalance and to downsize the magnetic components by selecting the optimal coupling coefficient taking into consideration the maximum permissible percentage of unbalanced currents. Simulation case studies are presented to support the analysis. Finally, a 1-kW prototype of the interleaved boost converter is built to validate the accuracy of the design method.

    DOI: 10.1109/TPEL.2017.2707385

    Web of Science

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  127. Lagrangian dynamics model and practical implementation of an integrated transformer in multi-phase LLC resonant converter Reviewed International coauthorship International journal

    Noah Mostafa, Umetani Kazuhiro, Imaoka Jun, Yamamoto Masayoshi

    IET POWER ELECTRONICS   Vol. 11 ( 2 ) page: 339 - 347   2018.2

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1049/iet-pel.2017.0485

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  128. Winding orientation method to minimise the secondary leakage of a gapped transformer utilised in LLC resonant converter

    Noah M., Umetani K., Yamamoto M., Imaoka J.

    ELECTRONICS LETTERS   Vol. 54 ( 3 ) page: 157 - 159   2018.2

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  129. A Novel Transformer Structure Used in a 1.4 MHz LLC Resonant Converter with GaNFETs

    Ou Tengfei, Noah Mostafa, Morita Koichi, Tsuruya Mamoru, Namiki Seiji, Imaoka Jun, Yamamoto Masayoshi

    2018 IEEE INTERNATIONAL POWER ELECTRONICS AND APPLICATION CONFERENCE AND EXPOSITION (PEAC)     page: 1562 - 1566   2018

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    Web of Science

  130. Parasitic Inductance Design Considerations to Suppress Gate Voltage Oscillation of Fast Switching Power Semiconductor Devices

    Sugihara Yusuke, Nanamori Kimihiro, Yamamoto Masayoshi, Kanazawa Yasuki

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)     page: 2789 - 2795   2018

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    Web of Science

  131. Multiple Exciting Voltage Control for Maximization of Multi-hop Wireless Power Transfer Efficiency Reviewed International journal

    Sasaki Masato, Yamamoto Masayoshi

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)     page: 3344 - 3348   2018

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  132. Modeling, Magnetic Design, and Simulation Methods Considering DC Superimposition Characteristic of Powder Cores Used in Power Converters Reviewed International coauthorship International journal

    Imaoka Jun, Okamoto Kenkichiro, Shoyama Masahito, Ishikura Yuki, Noah Mostafa, Yamamoto Masayoshi

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA     page: 1095 - 1102   2018

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  133. Fundamental Experiment of 3-phase Electric Resonant Coupling Wireless Power Transfer Reviewed International journal

    Hattori Fumiya, Imaoka Jun, Yamamoto Masayoshi, Masuda Mitsuru

    2018 7TH INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY RESEARCH AND APPLICATIONS (ICRERA)     page: 1417 - 1422   2018

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    Language:English   Publishing type:Research paper (scientific journal)  

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  134. Experimental Evaluation of Inverter System Consisting of 4-parallel GaN Devices Unit

    Ohnuma Yoshiya, Miyawaki Satoshi, Hattori Fumiya, Yamamoto Masayoshi

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)     page: 2738 - 2742   2018

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    Web of Science

  135. Core Loss Evaluation in Powder Cores: A Comparative Comparison between Electrical and Calorimetric Methods

    Ishikura Yuki, Imaoka Jun, Noah Mostafa, Yamamoto Masayoshi

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)     page: 1087 - 1094   2018

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    Authorship:Last author   Language:English  

    Web of Science

  136. Review of Current Balance Mechanism in Multiphase LLC Resonant Converters

    Noah Mostafa, Imaoka Jun, Ishikura Yuki, Umetani Kazuhiro, Yamamoto Masayoshi

    2018 IEEE 27TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)     page: 1030 - 1036   2018

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    Language:Japanese  

    Web of Science

  137. Proposal for the New Control Method Having High Responsiveness and Robustness for the Boost-Type DC-DC Converter Reviewed

    Kawakami Taichi, Harada Toshikazu, Yamamoto Masayoshi, Umetani Kazuhiro

    IEEJ Transactions on Electronics, Information and Systems   Vol. 138 ( 4 ) page: 395 - 404   2018

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    Language:Japanese   Publishing type:Research paper (conference, symposium, etc.)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>This paper proposes a novel control method to improve the responsiveness and the robustness of the boost DC-DC converter. The proposed control method is a feedback control incorporating a minor control that works to balance the input and output power. Experiment was carried out to verify the responsiveness and the robustness of the proposed control in comparison with the conventional voltage-mode and current-mode control. As a result, the proposed method revealed both of the fast response and the robust output voltage regulation against the load change.</p>

    DOI: 10.1541/ieejeiss.138.395

    Scopus

    CiNii Research

  138. Bidirectional Converter Using Multistage FET Driving technique with voltage balance function Reviewed

    Ishikura Yuki, Hosotani Tatsuya, Yamamoto Masayoshi

    Journal of the Japan Institute of Power Electronics   Vol. 44 ( 0 ) page: 128 - 134   2018

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (other academic)   Publisher:The Japan Institute of Power Electronics  

    This paper presents a bidirectional convert using by multistage FET driving technique with voltage balance function. The voltage balance function can reduce influence of the voltage unbalance phenomenon which drain voltage fluctuation depending on output current. The voltage unbalance phenomenon is clarified by using an equivalent circuit of FETs connected in series. The necessity of voltage balance function is discussed, and verified in experiment. The experimental results have proven that the bidirectional converter by using the driving technique can achieve 98% or more power conversion efficiency from 170 W to 1000 W of power range, and a maximum power conversion efficiency of 99.2%.

    DOI: 10.5416/jipe.44.128

    CiNii Research

  139. An mathematical analysis of false turn-on phenomenon of GaN HEMT

    Iwaki T., Sawada T., Yamamoto M.

    2017 IEEE CPMT Symposium Japan, ICSJ 2017   Vol. 2017-January   page: 189 - 190   2017.12

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    GaN-HEMT achieves the reduction in size and weight of power conversion circuits, thanks to its high frequency switching characteristics. However, the switching speed and low threshold voltage may cause a false turn-on phenomenon, which is a fatal effect for the applications. It is urgent issue to tackle and avoid this problem by modifying the circuit conditions. In this letter, the theoretical analysis of a full bridge inverter is developed to figure out the behavior of the gate voltage, which is the keyfactor parameter of false turn-on. Based on the analysis, the circuit conditions which minimize the gate voltage spike are derived.

    DOI: 10.1109/ICSJ.2017.8240113

    Scopus

  140. An analysis of false turn-on phenomenon of GaN HEMT with parasitic components

    Iwaki T., Ishiwaki S., Sawada T., Yamamoto M.

    INTELEC, International Telecommunications Energy Conference (Proceedings)   Vol. 2017-October   page: 347 - 350   2017.12

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    Wide band gap power semiconductor devices are now replacing the Si-MOSFET or IGBT. GaN-HEMT achieves the reduction in size and weight, thanks to its high frequency switching behavior. However, its high-speed switching characteristics and low threshold voltage may cause a false turn-on phenomenon, which is a fatal effect for the applications. It is urgent issue to tackle and avoid this problem by modifying the circuit conditions. We described differential equations from simplified equivalent circuit of inverter, and algebraically solved with some assumptions. At the same time, drain voltage equation is also developed. As a result, the gate voltage fluctuation was described as a composite waveform including two LC resonance phenomenon, which occur on gate drive circuit and main power flow.

    DOI: 10.1109/INTLEC.2017.8214160

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  141. Analytical investigation of interleaved DC-DC converter using closed-coupled inductor with phase drive control

    Ebisumoto D., Kimura S., Nanamori K., Noah M., Ishihara M., Imaoka J., Yamamoto M.

    INTELEC, International Telecommunications Energy Conference (Proceedings)   Vol. 2017-October   page: 526 - 529   2017.12

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    Interleaved techniques and magnetic integration in a boost converter have gained attention in electric powertrains system for electric, hybrid and fuel cell vehicles in order to achieve high power density or to improve power conversion efficiency. Furthermore, the proposed multi-phase boost converter is equipped with a phase drive control to improve the efficiency at all load ranges. Furthermore, a design method of a coupled-inductor for an interleaved boost converter with phase drive control is also proposed. However, the interleaved DC-DC converter using coupled method with phase drive control has many problems. In this paper, this problem of interleaved DC-DC converter using coupled inductor with phase drive control (PDC) is analyzed. In addition, defensive method of this method.

    DOI: 10.1109/INTLEC.2017.8214190

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  142. A novel LLC resonant DC-DC converter with integrated transformer

    Kimura S., Nanamori K., Noah M., Yamamoto M.

    INTELEC, International Telecommunications Energy Conference (Proceedings)   Vol. 2017-October   page: 506 - 510   2017.12

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    DC-DC converters in electric vehicle (EVs) and hybrid electric vehicles (HEVs) have required higher power density and high efficiency. This paper proposes a novel LLC resonant DC-DC converter with integrated transformer. This circuit is composed of three LLC converter cells which are connected in series on the primary side and in parallel on the secondary side with interleaved control scheme. The Series Input Parallel Output (SIPO) structure enables the converter cells to share the input voltage and output current. The interleaved operation diminishes the ripple current of the output capacitor, and can reduce the size of the output capacitor. Also a reduction effect of the transformers is obtained by using the integrated transformer which independent transformers are combined into a single core. All these features make the proposed converter suitable for especially high input voltage and high output current applications to realize higher power and higher efficiency. The steady state operating principle of the converter was demonstrated. The theoretical analysis, the equivalent model and voltage gain of the converter are presented based on fundamental harmonic analysis of the converter. A prototype with 330V input and 500W output was built-up to validate the theoretical analysis.

    DOI: 10.1109/INTLEC.2017.8214186

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  143. Modeling and design of interleaved multi-phase DC-DC converter with 2-phase coupled inductor cell for high power density

    Kimura S., Nanamori K., Yamamoto M.

    2017 6th International Conference on Renewable Energy Research and Applications, ICRERA 2017   Vol. 2017-January   page: 416 - 422   2017.12

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    Publisher:2017 6th International Conference on Renewable Energy Research and Applications, ICRERA 2017  

    An interleaved multi-phase converter with coupled inductor can achieve high power density and high efficiency, and is an effective approach for high power applications. However, a number of phases also results in the fact that component counts are increased. In this paper, the downsizing performances when the number of phase change in a multi-phase DC-DC converter with 2-phase coupled inductor cell are investigated to make the full performance. The volume and the loss modeling of each component at n-phases are provided. Also some comparison results are derived and discussed.

    DOI: 10.1109/ICRERA.2017.8191096

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  144. Total volume evaluation of high-power density non-isolated DC-DC converters with integrated magnetics for electric vehicles Reviewed International coauthorship International journal

    Martinez Wilmar, Cortes Camilo, Yamamoto Masayoshi, Imaoka Jun, Umetani Kazuhiro

    IET POWER ELECTRONICS   Vol. 10 ( 14 ) page: 2010 - 2020   2017.11

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    Language:Japanese   Publisher:IET Power Electronics  

    One of the main problems in electric vehicles is the volume of their electrical systems because their bulky components carry additional mass and high cost to the total system. On this topic, interleaving-phases and magnetic coupling techniques have been reported as effective methods for increasing the power density of the DC-DC converters that work between the storage unit and the motor inverter. In that sense, a volume assessment of these topologies would provide a better understanding of the problems to be faced when an electric power train is designed. In this paper, a volume modelling methodology is introduced with the purpose of comparing four different DC-DC converters: Single-Phase Boost, Two-Phase Interleaved with non-coupled inductors, Loosely Coupled Inductor (LCI), and Integrated Winding Coupled Inductor (IWCI). The analysis considers the volume of magnetic components, power devices (conventional and next-generation), cooling devices and capacitors. The methodology can be used as a part of an optimization procedure to minimize the volume of DC-DC converters. Conclusively, LCI and IWCI were found effective to miniaturize power converters with a power density of 8.4 W/cc and 9.66 W/cc, respectively. Moreover, a maximum efficiency of 98.04% and 97.61% was obtained for a 1kW LCI and IWCI prototypes, respectively.

    DOI: 10.1049/iet-pel.2017.0157

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  145. An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter

    Noah M., Endo S., Kimura S., Yamamoto M., Imaoka J., Umetani K., Hiraki E.

    2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe   Vol. 2017-January   2017.11

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    In the LLC resonant converter,the transformer core is usually gapped to realize the designed value of magnetizing inductance that allows for soft switching. The air gap length which is in a scale of millimeters may be affected by the humidity and long working hours of the ferrite material, resulting into a variation of the core permeability. Moreover, a slight variation of the transformer core permeability may be encountered with any possible change in the core temperature. In a proper transformer design, the transformer shall operate with an optimum value of effective permeability where the sum of both copper and core losses is minimal. In this paper, the transformer optimal design is presented. Moreover, the influence of the permeability on the transformer's copper and core losses is revealed. Furthermore, with the help of newly derived equations, the effect of the transformer's effective permeability on the LLC converter conduction turn-on and turn-off losses is reported. Along with the theoretical discussion,the analysis is supported with simulation and experimental results utilizing a 250W 200kHz prototype.

    DOI: 10.23919/EPE17ECCEEurope.2017.8099301

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  146. A Lagrangian dynamics model of integrated transformer incorporated in a multi-phase LLC resonant converter

    Noah M., Umetani K., Endo S., Ishibashi H., Imaoka J., Yamamoto M.

    2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017   Vol. 2017-January   page: 3781 - 3787   2017.11

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    In conventional arrangements of three-phase LLC converters, there are at least three magnetic components that occupy a considerable volume and mass of the power converter. Although, the three-phase LLC topology has many advantages over the single-phase one, circuit designers tend to select the singlephase topology because it has a minimal number of magnetic components. In this paper, with the purpose of promoting the industrial applications of the three-phase topology, Lagrangian dynamics is applied to theoretically prove that it is possible to replace the three-discrete transformers by a single integrated transformer. The Lagrangian dynamics theory allowed us to derive a physically motivated model for the integrated transformer, in which each component of the integrated transformer has its own Lagrangian parameter. The remarkable result to emerge from the Lagrangian model is that in a symmetrical design, there is no interphase coupling; this is regardless of the value of the coupling coefficient between the phases. This means that there is no return path for the three ac fluxes, and as a result the magnetic components can be downsized. Therefore, the major advantages of using integrated magnetics in the LLC converter can be concluded as: cost-reduction, reduced weight, and realizing higher power density. Along with the theoretical discussion, experimental validation is provided utilizing a 500W - 390V/12V - 200kHz prototype.

    DOI: 10.1109/ECCE.2017.8096668

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  147. Analysis of false turn-on phenomenon of GaN HEMT with parasitic inductances for propose novel design method focusing on peak gate voltage

    Ishiwaki S., Iwaki T., Sugihara Y., Nanamori K., Yamamoto M.

    2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017   Vol. 2017-January   page: 1395 - 1401   2017.11

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    GaN HEMT is generally characterized as fast switching and expected to achieve a power converter with high efficiency and high power density as a next-generation power semiconductor. However, the fast switching generates large switching noise, causing gate voltage fluctuation. Therefore, GaN HEMT can suffer from false triggering such as a false turn-on phenomenon due to its own low threshold voltage. The phenomenon is problematic especially for practical applications such as a half-bridge circuit. In order to elucidate this phenomenon, we derived the equation expressing gate voltage fluctuation. As a result, the gate voltage fluctuation was described as a composite waveform including two resonance frequencies. Additionally, the appropriateness of the analysis result was supported by comparing theoretical peak gate voltage of the simulation and experimental results. On the other hand analytical results indicated likelihood that balancing factors included in an analytical expression suppress false turn-on phenomenon. Although analytical treatment elucidated gate voltage fluctuation comprehensively, theoretical equation is complicated as design guideline to avoid the false turnon phenomenon. Therefore, this paper analyzed the gate voltage fluctuation mathematically based on L'Hopital's Rule and derived the minimum condition of the peak gate voltage. As a result, mathematical treatment proposes a design method focusing on a peak gate voltage that can achieve the safe operation of a halfbridge circuit.

    DOI: 10.1109/ECCE.2017.8095953

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  148. Analytical investigation on design instruction to avoid oscillatory false triggering of fast switching SiC-MOSFETs

    Sugihara Y., Nanamori K., Ishiwaki S., Hayashi Y., Aikawa K., Umetani K., Hiraki E., Yamamoto M.

    2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017   Vol. 2017-January   page: 5113 - 5118   2017.11

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    SiC-MOSFETs have attracting increasing attention because of their outstanding characteristics that contributes to high efficiency and high power density of power converters. However, compared to conventional Si-IGBTs, SiC-MOSFETs are susceptible to false triggering, because they tend to generate large switching noise due to ultrafast switching capability and have a lower threshold voltage in high temperature operation. Particularly, disastrous oscillation of repetitive false triggering can occur after a fast turn-off, which is the severe issue for practical application of SiC-MOSFETs. The purpose of this paper is to give an instruction to avoid this phenomenon. This paper hypothesized that the repetitive false triggering is the parasitic oscillation caused by parasitic capacitance of SiC-MOSFET, and parasitic inductance of wiring. Based on this hypothesis, this paper analyzed the oscillatory condition of the parasitic oscillator to propose a design instruction to avoid the oscillatory false triggering. The result revealed that the parasitic inductance of the gate, drain, and source wiring should be designed so that the resonance frequency of the parasitic LC resonator in the gating circuit is far apart from that of the power circuit. This paper also presents experimental results that support appropriateness of the proposed design instruction.

    DOI: 10.1109/ECCE.2017.8096861

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  149. Magnetic structure of Close-coupled inductors to improve the thermal handling capability in interleaved DC-DC converter Reviewed International coauthorship International journal

    Chuong T.H., Kimura S., Ebisumoto D., Noah M., Ishihara M., Yamamoto M., Imaoka J., Martinez W.

    2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017   Vol. 2017-January   page: 205 - 210   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017  

    Interleaved DC-DC converter employing closecoupled inductors is a popular topology among other power converters topologies. Close-coupled inductors allow the power converter to achieve high power density and high efficiency. This paper proposes a novel magnetic structure of close-coupled inductors suitable for increasing the thermal handling capability. The proposed magnetic structure is combined of different magnetic materials, namely, ferrite and powder cores. The design method of the integrated close-coupled inductors are presented. Furthermore, this design method is considering the DC bias superposition characteristics, and the iron and copper losses as well. A 300W prototype is built to validate the proposed analysis. Finally, excellent heat dissipation of the proposed magnetic structure of the integrated close-coupled inductors is also reported.

    DOI: 10.1109/ECCE.2017.8095782

    Scopus

  150. Mathematical analysis of GaN high electron mobility transistor false turn-on phenomenon Reviewed International coauthorship International journal

    Iwaki T., Ishiwaki S., Sawada T., Yamamoto M.

    ELECTRONICS LETTERS   Vol. 53 ( 19 ) page: 1327 - 1329   2017.9

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1049/el.2017.2225

    Web of Science

    Scopus

  151. A Lagrangian Dynamics Model of Integrated Transformer Incorporated in a Multi-phase LLC Resonant Converter

    Noah Mostafa, Umetani Kazuhiro, Endo Shun, Ishibashi Hiraki, Imaoka Jun, Yamamoto Masayoshi

    2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     page: 3781 - 3787   2017

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    Web of Science

  152. Power Flow Interactive Sharing between Two DC Nanogrids Photovoltaic Local Branch Dynamic System at Island Operation

    Bauomy Maged F., Gamal Haytham, Shaltout Adel A., Noah Mostafa, Yamamoto Masayoshi

    2017 19TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'17 ECCE EUROPE)     2017

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    Authorship:Last author   Language:English  

    Web of Science

  153. Modeling and Design of Interleaved Multi-phase DC-DC Converter with 2-phase Coupled Inductor Cell for High Power Density Reviewed International journal

    Kimura Shota, Nanamori Kimihiro, Yamamoto Masayoshi

    2017 IEEE 6TH INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY RESEARCH AND APPLICATIONS (ICRERA)     page: 416 - 422   2017

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  154. Analytical Investigation on Design Instruction to Avoid Oscillatory False Triggering of Fast Switching SiC-MOSFETs

    Sugihara Yusuke, Nanamori Kimihiro, Ishiwaki Seiya, Hayashi Yuma, Aikawa Kyota, Umetani Kazuhiro, Hiraki Eiji, Yamamoto Masayoshi

    2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     page: 5113 - 5118   2017

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    Authorship:Last author   Language:English  

    Web of Science

  155. Analytical Investigation of Interleaved DC-DC Converter using Closed-Coupled Inductor with Phase Drive Control

    Ebisumoto Daigoro, Kimura Shota, Nanamori Kimihiro, Noah Mostafa, Ishihara Masataka, Imaoka Jun, Yamamoto Masayoshi

    2017 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)     page: 526 - 529   2017

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    Authorship:Last author   Language:English  

    Web of Science

  156. Analysis of False Turn-On Phenomenon of GaN HEMT with Parasitic Inductances for Propose Novel Design Method Focusing on Peak Gate Voltage

    Ishiwaki Seiya, Iwaki Toshihiro, Sugihara Yusuke, Nanamori Kimihiro, Yamamoto Masayoshi

    2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     page: 1395 - 1401   2017

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    Authorship:Last author   Language:English  

    Web of Science

  157. An Mathematical Analysis of False Turn-On Phenomenon of GaN HEMT

    Iwaki Toshihiro, Sawada Takashi, Yamamoto Masayoshi

    2017 IEEE CPMT SYMPOSIUM JAPAN (ICSJ)     page: 189 - 190   2017

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    Authorship:Last author   Language:English  

    Web of Science

  158. An Investigation into a Slight-Variation of the Transformer Effective Permeability in LLC Resonant Converter

    Noah Mostafa, Endo Shun, Kimura Shota, Yamamoto Masayoshi, Imaoka Jun, Umetani Kazuhiro, Hiraki Eiji

    2017 19TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'17 ECCE EUROPE     2017

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    Language:English  

    Web of Science

  159. An Analysis of False Turn-On Phenomenon of GaN HEMT with Parasitic Components

    Iwaki Toshihiro, Ishiwaki Seiya, Sawada Takashi, Yamamoto Masayoshi

    2017 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)     page: 347 - 350   2017

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    Web of Science

  160. Allowable Power Analysis and Comparison of High Power Density DC-DC Converters with Integrated Magnetic Components

    Kimura Shota, Nanamori Kimihiro, Kawakami Taichi, Imaoka Jun, Yamamoto Masayoshi

    IEEJ Journal of Industry Applications   Vol. 6 ( 6 ) page: 463 - 472   2017

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    Language:Japanese   Publisher:The Institute of Electrical Engineers of Japan  

    <p>Interleaved dc-dc converters with integrated magnetic components are popular as converters capable to achieve high efficiency with less of volume and mass. There are three methods for integrated magnetic components: loosely-coupled inductors, closed-coupled inductors and integrated-winding-coupled inductors. This paper presents a method to calculate the allowable power in various circuit topologies. It is useful for measuring the allowable power without magnetic saturation of an inductor based on its size. Following the analysis of allowable power for each coupled inductor, the allowable power of the integrated magnetic components is compared to that of the conventional interleaved converter. This comparison is realized under the same conditions. As a result, the interleaved converter with loosely-coupled and integrated winding coupled inductors were found to be effective for the downsizing of the magnetic components under continuous conduction mode operation. On the other hand, the interleaved converter with close-coupled inductors is effective for the downsizing of the magnetic components under critical conduction mode operation. This comparative data is discussed from both theoretical and experimental points of view.</p>

    DOI: 10.1541/ieejjia.6.463

    Web of Science

    Scopus

    CiNii Research

  161. A Novel LLC Resonant DC-DC Converter with Integrated Transformer

    Kimura Shota, Nanamori Kimihiro, Noah Mostafa, Yamamoto Masayoshi

    2017 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)     page: 506 - 510   2017

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    Authorship:Last author   Language:English  

    Web of Science

  162. Magnetic Structure of Close-Coupled Inductors to Improve the Thermal Handling Capability in Interleaved DC-DC Converter Reviewed International coauthorship International journal

    Chuong, TH; Kimura, S; Ebisumoto, D; Noah, M; Ishihara, M; Yamamoto, M; Imaoka, J; Martinez, W

    2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)     page: 205 - 210   2017

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    Language:English   Publishing type:Research paper (scientific journal)  

    Web of Science

  163. Analysis of Self Turn-ON Phenomenon for the Application of Power Semiconductor Devices

    Proceedings of Microelectronics Symposium   Vol. 27 ( 0 ) page: 15 - 16   2017

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    Language:Japanese   Publisher:The Japan Institute of Electronics Packaging  

    DOI: 10.11486/mes.27.0_15

    CiNii Research

  164. Analyzing visitors' characteristics in tourist areas based on mobile phone users' location data

    Yamamoto M.

    Conference Proceedings - 23rd ISSAT International Conference on Reliability and Quality in Design     page: 1 - 5   2017

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    Language:Japanese   Publisher:Conference Proceedings - 23rd ISSAT International Conference on Reliability and Quality in Design  

    In recent years, so-called "big data" have been attracting the attention of companies and researchers. This study aims to identify the number of visitors of each period and their characteristics based on the location data of mobile phone users collected by the mobile phone company. The study sites of this survey are tourist destinations in Ishikawa Prefecture and Toyama city, including Kanazawa city, which became nationally popular after the Hokuriku Shinkansen opened in 2015. The opening of the Hokuriku Shinkansen brought more visitors to many areas. However, it also led to fewer visitors in some areas. The positive effect was remarkable in Kanazawa.

    Scopus

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Books 26

  1. EVの技術解析で国内産業を支える

    山本 真義( Role: Sole author)

    日刊自動車新聞社  2023.12 

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    Language:Japanese Book type:Textbook, survey, introduction

  2. 車載用パワーエレクトロニクス機器におけるノイズ発生メカニズムの基本と電気自動車におけるノイズ対策技術最前線

    ( Role: Sole author)

    科学情報出版  2023.12 

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    Total pages:116   Responsible for pages:10   Language:Japanese Book type:Textbook, survey, introduction

  3. 各社BEVのインバーター分析解析と次世代BEVに求められるパワーエレクトロニクス応用技術

    山本 真義( Role: Sole author)

    技術情報協会  2023.9 

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    Language:Japanese Book type:Textbook, survey, introduction

  4. 次世代自動車2030年ロードマップとそこに求められる次世代パワー半導体実装・センサ応用技術

    山本 真義( Role: Sole author)

    日本工業出版  2023.9 

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    Language:Japanese Book type:Textbook, survey, introduction

  5. EVパワー半導体、日中韓3車比較 トヨタに残る「HV最適」

    山本 真義( Role: Sole author)

    NIKKEIMobility  2023.9 

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    Language:Japanese Book type:General book, introductory book for general audience

  6. DC-DCコンバータへのGaNの適用事例

    山本 真義( Role: Sole author)

    CQ出版  2023.8 

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    Language:Japanese Book type:Textbook, survey, introduction

  7. SEALの統合モーターコントローラーの解説

    山本 真義

    日経BP  2023.7 

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    Language:Japanese Book type:Textbook, survey, introduction

  8. テクノロジー・ロードマップ2024-2033 全産業編

    山本 真義( Role: Sole author)

    日経BP  2023.6 

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    Language:Japanese Book type:Textbook, survey, introduction

  9. 「日立アステモ、新CEOに前ホンダ副社長 主導権が移行」以降108件解説

    山本 真義( Role: Sole author)

    日経電子版「Think!」  2023.6 

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    Language:Japanese Book type:Textbook, survey, introduction

  10. GaNパワー半導体を適用した電気自動車用DC-DCコンバータのノイズ対策技術

    山本 真義( Role: Sole author)

    科学情報出版  2023.5 

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    Total pages:130   Responsible for pages:9   Language:Japanese Book type:Textbook, survey, introduction

  11. 車載用ノイズ対策技術最前線

    山本真義( Role: Joint author)

    科学情報出版社  2023.2 

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    Total pages:138   Responsible for pages:14   Language:Japanese Book type:General book, introductory book for general audience

  12. 中国50万円EVのインバーター、超低コスト実現の見事な設計力

    山本真義( Role: Joint author)

    日経BP  2022.4 

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    Total pages:98   Responsible for pages:7   Language:Japanese Book type:General book, introductory book for general audience

  13. フォルクスワーゲン「ID.3」徹底分解

    山本真義( Role: Joint author)

    日経BP  2022.2 

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    Language:Japanese Book type:Textbook, survey, introduction

  14. パワー半導体SiC/GaNの課題... 高速スイッチングによるサージと 対策回路への研究

    山本真義( Role: Joint author)

    CQ出版株式会社  2022.2 

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    Total pages:242   Responsible for pages:14   Language:Japanese Book type:Textbook, survey, introduction

  15. 電動車向け次世代パワー半導体の最新動向と今後の予測

    山本真義( Role: Joint author)

    技術情報協会  2022.2 

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    Language:Japanese Book type:Textbook, survey, introduction

  16. トランジスタ技術

    山本真義( Role: Joint author ,  ポルシェのEVの最新インバータ解体ショー)

    CQ出版株式会社  2022.2 

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    Total pages:12   Language:Japanese Book type:General book, introductory book for general audience

  17. 次世代EV/HEV用モータの高出力化と関連材料の開発

    山本真義( Role: Joint author)

    技術情報協会  2022.1 

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    Language:Japanese Book type:Textbook, survey, introduction

  18. 次世代パワー半導体の開発動向と応用展開EV・HEV用モータと、高出力化に向けた関連材料の開発

    山本真義( Role: Joint author)

    技術情報協会  2021.12 

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    Language:Japanese Book type:Textbook, survey, introduction

  19. テクノロジー・ロードマップ 2022-2031 全産業編

    山本真義( Role: Joint author)

    日経BP  2021.11 

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    Language:Japanese

  20. JRCM NEWS

    山本真義( Role: Joint author)

    一般財団法人 金属材料研究開発センター  2021.8 

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    Total pages:6   Responsible for pages:1   Language:Japanese

  21. 次世代ジェット旅客機

    山本真義( Role: Sole author)

    日刊興業新聞  2021.5 

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    Total pages:28   Responsible for pages:1   Language:Japanese

  22. 自動車電動化の潮流

    山本真義( Role: Sole author)

    日刊工業新聞  2021.2 

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    Total pages:36   Responsible for pages:1   Language:Japanese

  23. 次世代パワー半導体の開発と空飛ぶクルマへの適用

    山本真義( Role: Sole author)

    空飛ぶクルマ  2020.10 

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    Total pages:350   Responsible for pages:20   Language:Japanese

  24. xEV における SiC/GaN 応用パワーエレクトロニクスの EMC 対策技術

    山本真義( Role: Sole author)

    月刊 車載テクノロジー  2020.9 

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    Total pages:500   Responsible for pages:6   Language:Japanese Book type:Textbook, survey, introduction

  25. 超高速GaNパワー半導体応用におけるノイズ発生 メカニズムと高速スイッチングに起因するノイズの効果的な抑制法

    山本真義( Role: Sole author)

    工業材料  2020.9 

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    Total pages:450   Responsible for pages:7   Language:Japanese Book type:Textbook, survey, introduction

  26. 次世代自動車用パワー半導体と周辺機器・部材の分解解説と技術動向

    山本真義( Role: Sole author)

    クリーンテクノロジー  2020.9 

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    Total pages:450   Responsible for pages:7   Book type:Textbook, survey, introduction

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Presentations 180

  1. Cutting Edge Technologies of Power Semiconductor Device Applications for Electric Vehicle's Power Electronics Systems in Japan, US, Europe and China Case Invited International conference

    Masayoshi Yamamoto

    International Symposium on Semiconductor Manufacturing 2022  2022.12.12  ISSM

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Country:Japan  

  2. Design Strategy of Power Semiconductor Devices Packaging Techniques for Next Generation Electric Vehicle Invited

    2024.3.22 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  3. 日米欧中の各電動車(xEV)の分解解析から読み解く車載応用技術最前線と2030年の自動車像 Invited

    山本 真義

    中産連×愛知県 自動車産業フォーラム2024最新技術講座  2024.3.15  一般社団法人中部産業連盟

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    Event date: 2024.3

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  4. 2相AC-DCインターリーブフライバックコンバータにおける統合トランスの適用と設計法 Invited

    平沢 開, ローク カール レーモンド デラー クールズ, チェシフン, 米澤 遊, 今岡 淳, 山本 真義

    令和6年電気学会全国大会  2024.3.14  一般社団法人電気学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学   Country:Japan  

  5. 回路平衡化を適用したブリッジレスフライバックAC-DCコンバータにおけるDMノイズ解析 Invited

    宇井 瞭介, Sihoon Choi, Jong-Won Shin, 今岡 淳, 山本 真義

    令和6年電気学会全国大会  2024.3.16  一般社団法人電気学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学   Country:Japan  

  6. 電動航空機における熱マネジメントシステムの検討 Invited

    森田 彩矢, 大水 耀太, 重松 浩一, 今岡 淳, 山本 真義

    令和6年電気学会全国大会  2024.3.16  一般社団法人電気学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学   Country:Japan  

  7. Analysis of Novel Heatsink Implemented in the Power Module of Automotive Traction Inverter Invited International coauthorship

    Jiyoon Choi, Thiyu Warnakulasooriya, Sihoon Choi, Jun Imaoka, Masayoshi Yamamoto

    第38回エレクトロニクス実装学会春季講演大会  2024.3.13  一般社団法人エレクトロニクス実装学会

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    Event date: 2024.3 - 3034.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京理科大学   Country:Japan  

  8. Theoretical Loss Analysis of Vertical GaN MOSFETs in a Totem-pole Bridgeless PFC Considering Drift Layer Variation Invited International coauthorship

    Karl Raymond dela Cruz Roque,Thiyu Warnakulasooriya, Sihoon Choi,Yu Yonezawa, Daisuke Arai, Masayoshi Yamamoto, Yasuhisa Ushida, Tohru Oka

    令和6年電気学会全国大会  2024.3.16  一般社団法人電気学会

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    Event date: 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:徳島大学   Country:Japan  

  9. SiC Power Module with a Low-Permittivity Material to Reduce Common-Mode Noise Invited International coauthorship

    Jiyoon Choi, Sihoon Choi, Jong-Won Shin, Yu Yonezawa, Arihiro Kamiya, Jun Imaoka, Masayoshi Yamamoto

    2024.3.14 

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    Event date: 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  10. パワエレを基幹インフラとして国が繁栄するために必要な経済運営 Invited

    新井大輔・米澤 遊・今岡 淳・山本真義

    電子通信エネルギー技術研究会(EE)  2024.3.11  電子情報通信学会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:機械振興会館   Country:Japan  

  11. Technical Trend of Integration System between Compound Power Semiconductor Devices and High Voltage Battery for Autmotive Application Invited International conference

    Battery Summit  2024.2.27 

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    Event date: 2024.2

    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:Japan  

  12. SiC Power Module Design with a Low-Permittivity Material to Reduce Common-Mode Noise Invited International coauthorship International conference

    Sihoon Choi, Jiyoon Choi, Yu Yonezawa, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

    IEEE Applied Power Electronics Conference and Exposition  2024.2.26  IEEE IAS, PELS, PSMA

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    Event date: 2024.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Long Beach, CA   Country:United States  

  13. Common-Mode Noise Reduction for Bridgeless Flyback PFC Rectifier with Balance Technique Invited International coauthorship International conference

    Sihoon Choi, Yikun Yin, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

    IEEE Applied Power Electronics Conference and Exposition  2024.2.26  IEEE IAS, PELS, PSMA

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    Event date: 2024.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Long Beach, CA   Country:United States  

  14. Analysis of Eddy Currents and Thermal Modeling of Planar Magnetic Components with Metal Housing Invited International conference

    Atsushi Hasenuma, Jun Imaoka, Masayoshi Yamamoto, Tatsuya Miyazaki, Yuta Okawauchi, Akihiro Kawano

    IEEE Applied Power Electronics Conference and Exposition  2024.2.26  IEEE IAS, PELS, PSMA

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    Event date: 2024.2

    Language:English   Presentation type:Poster presentation  

    Venue:Long Beach, CA  

  15. 車載用バッテリー充電器の最新動向 Invited

    山本 真義

    車載デバイスの将来展望調査FT  2024.2.22  電子情報技術産業協会

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    Event date: 2024.2

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:喜山倶楽部   Country:Japan  

  16. 車載用パワー半導体応用機器の最新動向と次世代xEVに求められるパワー半導体・受動素子実装技術 Invited

    山本 真義

    カーエレクトロニクス研究会  2024.2.20  カーエレクトロニクス研究会

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    Event date: 2024.2

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:回路会館   Country:Japan  

  17. 最新EVの特徴と全体動向 Invited

    山本 真義

    アモルファス・ナノ材料と応用第147委員会 第154回研究会  2024.2.16  独立行政法人 日本学術振興会

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    Event date: 2024.2

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:主婦会館プラザエフ   Country:Japan  

  18. 車載用48Vシステムの最新動向とテスラの戦略

    山本 真義

    新社会システムセミナー  2024.2.15  株式会社 新社会システム

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    Event date: 2024.2

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:紀尾井フォーラム   Country:Japan  

  19. 対象車両の部品構成の特徴やポイントについて Invited

    山本 真義

    EV分解展示実地研修会  2024.2.5  長野県産業振興機構

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    Event date: 2024.2

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:三洋貿易(株)瑞浪展示場   Country:Japan  

  20. Roadmap for Next Generation xEV in 2030 and Its Technical Trend of Next Generation Power Semiconductor Devices Module and Sensor Application Invited International conference

    2024.1.26 

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    Event date: 2024.1

    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:Japan  

  21. 2030年の電気自動車像とそこに求められる次世代新技術 Invited

    山本 真義

    愛知工研協会 新春賀交流会  2024.1.23  愛知工研協会

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    Event date: 2024.1

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:名鉄グランドホテル   Country:Japan  

  22. 次世代xEV用パワーエレクトロンクス応用システムに求められる電子部品デバイス技術と2030年におけるxEV像予想 Invited International coauthorship

    山本 真義

    スマートセンシングとその社会実装技術分解  2024.1.19  電子情報技術産業協会

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    Event date: 2024.1

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:大手町センタービル4階   Country:Japan  

  23. Prototyping and Evaluation of SiC Half Bridge Circuit using Power Device Embedded Module Process Invited International conference

    Kazuhito Nakamura

    Embedding 2024 - JISSO Information sharing forum   2024.1.15 

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    Event date: 2024.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Fraunhofer IZM, Berlin   Country:Germany  

  24. 2030年のEVに求められるパワー半導体応用技術 Invited

    山本 真義

    セミコンジャパン  2023.12.15  セミジャパン

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    Event date: 2023.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京ビックサイト   Country:Japan  

  25. 統合トランスを適用したAC-DCインタリーブフライバックコンバータ Invited

    平沢 開, チェシフン, ローク カール レーモンド デラー クールズ, 米澤 遊, 今岡 淳, 山本 真義

    電子通信エネルギー技術研究会  2023.12.9  一般社団法人電子情報通信学会

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    Event date: 2023.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:機械振興会館   Country:Japan  

  26. Minimaization of Bridgeless Power Factor Correction Flyback Rectifier with Integrated Transformer Invited International coauthorship International conference

    Haruki Hirasawa, Sihoon Choi, Yu Yonezawa, Jun Imaoka, Masayoshi Yamamoto

    ICMaSS2023(International Conference on Materials and Systems for Sustainability)  2023.12.3  IMaSS

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya University   Country:Japan  

  27. Analysis of Switching and Reverse recovery Losses ofr Wide Bandgap Devices in a Totem-pole Bridgeless PFC Rectifier Invited International coauthorship International conference

    Thiyu Warnakulasooriya, Sihoon Choi, Yu Yonezawa, Daisuke Arai, Masayoshi Yamamoto, Yasuhisa Ushida, Tohru Oka

    ICMaSS2023(International Conference on Materials and Systems for Sustainability)  2023.12.3  IMaSS

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya University   Country:Japan  

  28. Design and Packaging Method of SiC Power Module to Attenuate Common-Mode Noise Invited International conference

    Sihoon Choi, Jiyoon Choi, Yu Yonezawa, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

    ICMaSS2023(International Conference on Materials and Systems for Sustainability)  2023.12.2  IMaSS

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya University   Country:Japan  

  29. Relationship between Reduction of Switching Loss and Switching Timing of Active Gate Driver Based on Various Drain Currents Invited International conference

    Kiyotaka Ono, Haruki Hirasawa, Sihoon Choi, Yu Yonezawa, Jun Imaoka, Masayoshi Yamamoto

    ICMaSS2023(International Conference on Materials and Systems for Sustainability)  2023.12.2  IMaSS

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    Event date: 2023.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Nagoya University   Country:Japan  

  30. Investigate AC resistance Reduction Methods Under Higher Frequencies Operation Conditions Invited International conference

    Kota Okada, Jun Imaoka, Atsushi Hasenuma, Yuta Imaeda, Masayoshi Yamamoto

    ICMaSS2023(International Conference on Materials and Systems for Sustainability)  2023.12.2  IMaSS

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya University   Country:Japan  

  31. Loss Analysis of Heric Inverter for Photovoltaic Power Generation Invited International conference

    Shunki Hashimoto, Haruki Hirasawa, Sihoon Choi, Yu Yonezawa, Masayoshi Yamamoto

    ICMaSS2023(International Conference on Materials and Systems for Sustainability)  2023.12.2  IMaSS

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya University   Country:Japan  

  32. Theoretical Loss Analysis of Vertical GaN MOSFETs in a Totem-pole Bridgeless PFC Considering Parameter Variation Invited International coauthorship International conference

    Karl Raymond dela Cruz Roque, Thiyu Warnakulasooriya, Sihoon Choi, Yu Yonezawa, Daisuke Arai, Masayoshi Yamamoto, Yasuhisa Ushida, Tohru Oka

    ICMaSS2023 (International Conference on Materials and Systems for Sustainability)  2023.12.2  IMaSS

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nagoya University   Country:Japan  

  33. 次世代EVに求められる低損失SiCパワー半導体設計指針とその実装技術 Invited

    山本 真義

    先進パワー半導体分科会 第10回講演会  2023.12.1  公益社団法人応用物理学会

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    Event date: 2023.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:ANAクラウンプラザホテル金沢   Country:Japan  

  34. Volkswagen ID.4に分解から見える未来展望 Invited

    山本 真義

    岡山県産業振興財団研究会  2023.11.27  岡山県産業振興財団

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    Event date: 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  35. A Review of the Packaging Scheme of a Traction Inverter: Layout, Capacitor, Current Sensing and Power Module International coauthorship International conference

    Thiyu Warnakulasooriya, Sihoon Choi, Arihiro Kamiya, Jun Imaoka, Masayoshi Yamamoto

    12th IEEE CPMT Symposium Japan (ICSJ2023)   2023.11.16  IEEE

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto, Japan   Country:Japan  

    DOI: 10.1109/ICSJ59341.2023.10339571

  36. Prototyping and Evaluation of SiC Half Bridge Circuit using Power Device Embedded Module Process Towards Future Three Dimensional Packaging Invited

    Kazuhito Nakamura, Koichi Shigematsu, Jun Imaoka, Masayoshi Yamamoto

    12th IEEE CPMT Symposium Japan (ICSJ2023)  2023.11.16  IEEE

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto, Japan   Country:Japan  

    DOI: 10.1109/ICSJ59341.2023.10339574

  37. Prototyping and Evaluation of SiC Half Bridge Circuit using Power Device Embedded Module Process Towards Future Three Dimensional Packaging Invited International coauthorship International conference

    Sihoon Choi, Jiyoon Choi, Jong-Won Shin, Jun Imoka, Masayoshi Yamamoto

    12th IEEE CPMT Symposium Japan (ICSJ2023)   2023.11.16 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:IEEE   Country:Japan  

    DOI: 10.1109/ICSJ59341.2023.10339578

  38. 電動車・パワコン・家電民生機器におけるEMC対策技術最前線と各応用パワーエレクトロニクス機器分解解説 Invited

    山本 真義

    テクノフェア2023  2023.11.14  北川工業株式会社

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    Event date: 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:梅田サウスホール・名古屋コンベンションホール・大手町三井ホール   Country:Japan  

  39. 中国製EVに搭載されたパワーエレクトロニクス技術最前線と2030年に求められるEV用パワエレ技術予測 Invited

    山本 真義

    パワーエレクトロニクス学会研究会  2023.11.11  パワーエレクトロニクス学会

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    Event date: 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:中央電気倶楽部   Country:Japan  

  40. 小型EVの現在と未来 Invited

    山本 真義

    名古屋商工会議所研究会  2023.11.10  名古屋商工会議所

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    Event date: 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:ポートポートメッセ   Country:Japan  

  41. 電動化の最前線にせまる自動車メーカーのEV戦略と加速する技術革新 Invited

    山本 真義

    長野県工業技術総合センター研究会  2023.11.9  長野県工業技術総合センター

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    Event date: 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  42. 車載用パワーエレクトロニクス技術最新動向とSiC/GaN適用の事例と可能性に関する議論 Invited

    山本 真義

    一般社団法人日本電子デバイス産業協会研究会  2023.11.7  一般社団法人日本電子デバイス産業協会

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    Event date: 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:日本教育会館 喜山倶楽部   Country:Japan  

  43. 次世代モビリティにおける電気系システム最前線と宇宙衛星用パワーエレクトロニクス技術の将来動向(自動車、空飛ぶクルマ、航空機電動化から宇宙衛星まで) Invited

    山本 真義

    JAXA 研究開発部門研究会  2023.11.2  JAXA 研究開発部門

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    Event date: 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:名古屋大学 東山キャンパス 野依記念学術交流館   Country:Japan  

  44. xEV(電動車)におけるパワーエレクトロニクス技術最新動向 〜ジャパンモビリティーショー2023の報告も含めて〜 Invited

    山本 真義

    xEVテスティングイニシアティブ  2023.11.1  エグジビジョンテクノロジーズ

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    Event date: 2023.10 - 2023.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:軽井沢プリンスホテル   Country:Japan  

  45. ユースケースと活用事例(2)(名古屋大学) Invited

    渋谷 賢佑, 重松 浩一, 前田 充康, 藤森 光明, 山本 真義

    No.05-23 講習会「FMI (Functional Mockup Interface)によるモデル接続講習会」  2023.10.31  自動車技術会

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    Event date: 2023.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:公益社団法人 自動車技術会   Country:Japan  

  46. Fixed Frequency Operation in Critical Conduction Mode with Voltage-Controlled Variable Inductor Invited International coauthorship International conference

    S. Choi, J.-W. Shin, J. Imaoka, M.Yamamoto

    2023 IEEE Energy Conversion Congress and Exposition (ECCE)  2023.10.30 

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    Event date: 2023.10 - 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:IEEE  

    DOI: 10.1109/ECCE53617.2023.10362859

  47. Voltage-Controlled Variable Inductor to Fix the Switching Frequency in Critical Conduction Mode Invited International coauthorship International conference

    Sihoon Choi, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

    IEEE Energy Conversion Congress & Expo  2023.10.30  IEEE IAS, PELS

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    Event date: 2023.10 - 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nashville, TN, USA   Country:United States  

  48. EV革新を支える車載向けパワーデバイスの将来展望 Invited

    山本 真義

    第6 回 名古屋 ネプコン ジャパン   2023.10.25  ネプコンジャパン

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    Event date: 2023.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:ポートメッセなごや   Country:Japan  

  49. 自動車用SiCインバータの技術とインホイールモータ量産への課題 Invited

    山本 真義

    GLGセミナー  2023.9.23  GLG

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    Event date: 2023.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  50. EV用電気駆動系(e-Axle)の最新技術動向と山口県企業が取り組むべき技術戦略方針 Invited

    山本 真義

    山口県 電動車関連部品展示説明会セミナー  2023.9.8  山口県

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    Event date: 2023.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:山口県産業技術センター 多目的ホール   Country:Japan  

  51. BYD、トヨタ、テスラ、BMWの電気系システム分解から読み解く次世代半導体・自動車分野の戦略と最新技術動向 Invited

    山本 真義

    みらいのクルマテクノロジー  2023.9.8  株式会社アルペザ

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    Event date: 2023.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  52. 車載用パワーエレクトロニクス機器(インバーター・OBC)におけるEMC対策技術最前線 Invited

    山本 真義

    エレクトロニクス実装学会 サマーセミナー  2023.9.4 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:回路会館   Country:Japan  

  53. 最新EVの電力変換に関する特徴と動向 Invited

    山本 真義

    2023年ミッションフェローセッション  2023.9.1  エレクトロニクス実装学会

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    Event date: 2023.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  54. 各社の EV 用インバーター分解解説と次世代パワー半導体の車載応用の可能性と日本の勝機 Invited

    山本 真義

    電子デバイス産業新聞講演会  2023.8.30  産業タイムズ社

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    Event date: 2023.8

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:富士ソフトアキバプラザ   Country:Japan  

  55. 2030年に向けた電動車両(xEV)ロードマップとそこに求められる車載用化学応用技術要素 Invited

    山本 真義

    第124回東海技術サロン(CTCフォーラム)  2023.8.28  東海化学工業会

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    Event date: 2023.8

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  56. Balanced Bridgeless Flyback Power Factor Correction Rectifier to Reduce Common-Mode Noise Invited

    Sihoon Choi, Yikun Yin, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

    2023年電気学会産業応用部門大会  2023.8.24  一般社団法人電気学会

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    Event date: 2023.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  57. 最新EVにおけるe-AXCELの最新動向と技術分析 Invited

    山本 真義

    山口県 電動車関連部品展示説明会セミナー  2023.8.9  山口県

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    Event date: 2023.8

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:山口県産業技術センター 多目的ホール   Country:Japan  

  58. 最新EVの電力変換に関する特徴と動向 Invited

    山本 真義

    TECHNO-FRONTIER 2023  2023.7.26  一般社団法人日本能率協会

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    Event date: 2023.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京ビッグサイト   Country:Japan  

  59. 分解して見えたBEVのパワエレ動向と将来 Invited

    山本 真義

    イード オンラインセミナー  2023.7.18  株式会社イード

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    Event date: 2023.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  60. 2030年に向けた電動車両(xEV)ロードマップとそこに求められる車載パワーエレクトロニクス技術要〜 e-Axleの化合物半導体の適用からインホイールモーター技術最前線まで Invited

    山本 真義

    クルマの電動化 ― インホールモータへの期待  2023.7.14  豊田中央研究所

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    Event date: 2023.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:豊田中央研究所 厚生施設アクタス   Country:Japan  

  61. 2025年におけるEV用駆動システムのパラダイムシフトとそこに応用される車載用パワー半導体技術のトレンド Invited

    山本 真義

    日本能率協会セミナー  2023.6.30 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:Japan  

  62. 車載用パワー半導体実装技術に求められる信頼性要件とその方向性、新しいその車載応用 Invited

    山本 真義

    2023年度エレクトロニクス実装学会公開研究会  2023.6.23  エレクトロニクス実装学会

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    Event date: 2023.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:回路会館   Country:Japan  

  63. 「テスラ 3」をバラして分かったニッポン製造業の勝ち筋 Invited

    山本 真義

    ビジネスフォーラム  2023.6.22  ビジネスフォーラム事務局

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    Event date: 2023.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:ミッドランドホールA   Country:Japan  

  64. xEV用車載パワーエレクトロニクス応用分野における 構造・材料技術最前線 Invited

    山本 真義

    名古屋市工業研究所 職員勉強会  2023.6.16  名古屋市工業研究所

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    Event date: 2023.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:名古屋市工業研究所   Country:Japan  

  65. BEVの本格普及で加速する車載半導体市場&進化するパワーデバイス技術 Invited

    山本 真義

    グローバルネットセミナー  2023.5.26  グローバルネット株式会社

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    Event date: 2023.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:アルカディア市ヶ谷私学会館   Country:Japan  

  66. High reliable transformer-less deadtime less Inverter for Grid-connected Applications Invited International coauthorship International conference

    Silumin Senanayake, Thilak Senanayake, Jun Imaoka, Masayoshi Yamamoto

    ICPE2023-ECCE Asia (International Conference on Power Electronics and ECCE Asia  2023.5.23  ECCE Asia

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju Island,Republic of Koria   Country:Korea, Republic of  

  67. Experimental Verification of Maximum Operating Frequency for a SiC-MOSFET in Class-D ZVS Inverter Invited International coauthorship International conference

    Yi Xiong, Senanayake Thilak, Yu Yonezawa, Jun lmaoka, and Masayoshi Yamamoto

    11th International Conference on Power Electronics -ECCE Asia  2023.5.22  11th International Conference on Power Electronics -ECCE Asia

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  68. Modeling of Lithium-Ion Batteries with Butler-Volmer’s Equation and Constant Phase Element Invited International coauthorship International conference

    T. Yamahigashi, J. Shimura, K. Shibuya, Y. -H. Wu, K. Shigematsu, T. Hosotani, J. Kuromi, J. Imaoka, M. Yamamoto

    11th International Conference on Power Electronics – ECCE Asia (ICPE 2023-ECCE Asia)  2023.5.22  ECCE Asia

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju Island,Republic of Koria   Country:Korea, Republic of  

  69. Experimental Verification of Maximum Operating Frequency for a SiC-MOSFET in Class-D ZVS inverter Invited International coauthorship International conference

    Y. Xiong, S. Thilak, Y. Yonezawa, J. Imaoka, and M. Yamamoto,

    11th International Conference on Power Electronics – ECCE Asia (ICPE 2023-ECCE Asia)  2023.5.22  ECCE Asia

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju Island,Republic of Koria   Country:Korea, Republic of  

  70. Modeling of Lithium-Ion Batteries with Constant Phase Element and Butler-Volmer's Equation Invited International coauthorship International conference

    T. Yamahigashi, J. Shimura, K. Shibuya, Y. -H. Wu, K. Shigematsu, T. Hosotani, J. Kuromi, J. lmaoka, M. Yamamoto

    11th International Conference on Power Electronics -ECCE Asia  2023.5.22  ECCE Asia

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju Island,Republic of Koria   Country:Korea, Republic of  

  71. High Reliable Transformer-less Deadtime Less Inverter for Grid-connected Applications Invited International coauthorship International conference

    Silumin Senanayake, Thilak Senanayake, Jun lmaoka, Masayoshi Yamamoto

    11th International Conference on Power Electronics -ECCE Asia  2023.5.22  ECCE Asia

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju Island,Republic of Koria   Country:Korea, Republic of  

  72. 電動車用インバータのフィルムキャパシタ応用事例と  次世代xEVにおける新しい車載応用システムに要求されるキャパシタ性能 Invited

    山本 真義

    2023年度キャパシタフォーラム公開セミナー  2023.5.20  キャパシタフォーラム

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    Event date: 2023.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京理科大学野田キャンパス7号館6階講堂   Country:Japan  

  73. EV・空飛ぶクルマ向けパワーデバイス技術動向 Invited

    山本 真義

    SiCアライアンス シンポジウム  2023.4.25  社団法人SiCアライアンス

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    Event date: 2023.4

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:TKP品川港南口会議室 ホール4A   Country:Japan  

  74. 次世代パワーエレクトロニクスの現状と将来動向 Invited

    山本 真義

    レスポンスEVリスキリング講座  2023.4.24  株式会社イード

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    Event date: 2023.4

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  75. SiCパワー半導体 注目すべき最新のトレンドと設計 Invited

    山本 真義

    カーボンニュートラルテクノロジーフェア  2023.4.18  アイメディア株式会社

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    Event date: 2023.4

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  76. 日欧中米EVの徹底分解解説(材料・構造・電気・システムのそれぞれの視点から)と新EV時代において愛知県企業が執るべき事業戦略 Invited

    山本真義

    世界の電気自動車徹底比較  2023.3.24  名古屋商工会議所

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋市 名古屋商工会議所   Country:Japan  

  77. 自動車の電動化・自動運転の技術動向とEMC対策 Invited

    山本真義

    ぎふ技術革新センター 技術セミナー  2023.3.3  ぎふ技術革新センター運営協議会

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  78. 次世代自動車2030年ロードマップと日米欧EV用インバータ分析から読み解くEV用次世代パワー半導体技術予想 Invited

    山本真義

    エレクトロニクス実装学会関西支部(JIEP)  2023.3.1  エレクトロニクス実装学会関西支部(JIEP)

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:オンライン   Country:Japan  

  79. 車載用インバーター分解解析 Invited

    山本真義

    車載デバイスの将来展望調査FT  2023.2.27  電子情報技術産業協会(JEITA)

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    Event date: 2023.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京 如水会館   Country:Japan  

  80. 次世代パワー半導体の動向と今後の展望~各国xEVの分解から読み解く次世代自動車像と新しいパワー半導体応用技術分野~ Invited

    山本真義

    愛知県産業立地斉藤氏促進セミナー  2023.2.21  愛知県経済産業局

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    Event date: 2023.2

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:名古屋市 名古屋国際センター別棟ホール   Country:Japan  

  81. 各国の電動化自動車(xEV)の分解による最新パワーエレクトロニクス技術の解説と2025年に向けた電動化車両の要求技術動向 Invited

    山本真義

    電動化自動車(XEV)の最新技術動向  2023.2.20  長野県産業振興機構

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    Event date: 2023.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  82. 各国xEVの分解から読み解く2030年における次世代自動車像と車載用パワー半導体応用・計測技術最前線 Invited

    山本真義

    「名古屋大学 山本 真義教授 x テクトロニクス」オンライン開催セミナ  2023.2.7  株式会社テクトロニクス&フルーク

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    Event date: 2023.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京 品川インターシティホール   Country:Japan  

  83. 2030年における次世代自動車の覇者はEVかPHEVか?各国xEVの分解から読み解く次世代自動車像と新しいパワー半導体応用技術分野 Invited

    山本真義

    未来のクルマ Technology ONLINE 特別展示&セミナー  2023.2.1  一般社団法人表面技術協会 日本鍍金材料協同組合 株式会社JTBコミュニケーションデザイン

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    Event date: 2023.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京 東京ビッグサイト   Country:Japan  

  84. 米欧中で立ち上がる電気自動車巨大市場とそこに求められる知財技術分野とその未来 Invited

    山本真義

    日本弁理士会 東海会設立記念セミナー  2023.1.27  日本弁理士会東海会

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    Event date: 2023.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋 名古屋観光ホテル   Country:Japan  

  85. 次世代自動車2030年ロードマップとそこに求められる次世代パワー半導体実装・センサ応用技術 Invited

    山本真義

    ネプコンジャパン2023 半導体・センサ パッケージング展  2023.1.25  RX Japan株式会社

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    Event date: 2023.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京 東京ビッグサイト   Country:Japan  

  86. NIO(上海蔚来汽車)「ES8」分解解析セミナー Invited

    山本真義

    NIO(上海蔚来汽車)「ES8」分解解析セミナー  2023.1.24  一般社団法人 日本能率協会

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    Event date: 2023.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京 大手町ファーストスクエア   Country:Japan  

  87. IONIQ5車体基本仕様概要分解時に注目すべき技術ポイントについて

    山本真義

    令和4年度EV構造研究活動  2023.1.19  岡山県産業振興財団

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    Event date: 2023.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  88. EVのインバータから未来のクルマを語る Invited

    山本真義

    車載組込みシステムフォーラム 2023  2023.1.17  公益財団法人中部科学技術センター

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    Event date: 2023.1

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:名古屋 ナディアパークデザインホール   Country:Japan  

  89. NIO(上海蔚来汽車)「ES8」分解解析セミナー Invited

    山本真義

    NIO(上海蔚来汽車)「ES8」分解解析セミナー  2022.12.20  一般社団法人 日本能率協会

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    Event date: 2022.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:名古屋市 ウインク愛知   Country:Japan  

  90. GaNパワー半導体を適用した車載用DC-DCコンバーターの特性評価 Invited

    山本真義

    セミコンJAPAN  2022.12.16  科学情報出版株式会社

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    Event date: 2022.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 東京ビッグサイト   Country:Japan  

  91. 車載用パワーエレクトロニクス技術最新動向とSiC/GaN適用の事例と可能性に関する議論 Invited

    山本真義

    電子デバイス研修講座(専門講座)  2022.12.13  日本電子デバイス産業協会

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    Event date: 2022.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 日本教育会館   Country:Japan  

  92. 電圧型可変インダクタを用いた固定周波数CRM動作

    S. Choi, J-W. Shin, J. Imaoka, M. Yamamoto

    環境調和型新世代パワーエレクトロニクス技術 若手セミナー  2022.12.6  電気学会東海支部

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  93. パワーエレクトロニクス機器におけるノイズ対策の基本と車載用パワエレ応用技術最前線 Invited

    山本真義

    月刊EMC/EMC環境フォーラム  2022.11.29  科学情報出版株式会社

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    Event date: 2022.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  94. 日米欧中のxEV分解から見える次世代パワー半導体 の車載応用戦略と10年先のxEV市場を勝ち取る パワー半導体応用技術 Invited

    山本真義

    JEITAサステナブルIT・直流小委員会(第7回)  2022.11.22  一般社団法人 電子情報技術産業協会

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    Event date: 2022.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  95. 2025年における自動車メーカー各社のEV戦略とそこに要求される機械・電気系技術課題とその潮流予想 Invited

    山本真義

    第2回「次世代自動車関連部品・技術 専門講座」  2022.11.2  北海道機械工業会

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    Event date: 2022.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  96. Discussion of SiC/Gan Power Semiconductor Devices Technical and Market Trends for Next Generation Automotive Applications from Model 3 (Tesla) Disassembled Analysis Invited

    Masayoshi Yamamoto

    Asia Pacific Semiconductor Symposium  2022.10.28 

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    Event date: 2022.10

    Language:English   Presentation type:Symposium, workshop panel (nominated)  

    Country:Japan  

  97. ハイブリッド電動航空機(HEA)の電気系・ガスタービンエンジン推進部並びに全システムモデル化へのアプローチ Invited

    山本真義

    航空機電動化(ECLAIR)コンソーシアム第5回オープンフォーラム  2022.10.25  JAXA

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    Event date: 2022.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  98. 自動車のEV化潮流に対する電動化システムの各技術階層(材料・部品・システム)における最新技術要求と新しい車載アプリケーションの可能性 Invited

    山本真義

    EVに求められる最新技術トレンド  2022.10.21  ダイトロン株式会社

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    Event date: 2022.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 ダイトロン株式会社本社   Country:Japan  

  99. 日米欧中のEV用パワエレ分解解説と次世代自動車における電気系システムモデリング技術最前線 Invited

    山本真義

    次世代モビリティ電動化技術  2022.10.20  MathWorks Japan

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    Event date: 2022.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  100. 文科省PJ講演「電気自動車の現状と5~10年後の動向」 Invited

    山本真義

    文科省国プロ講演  2022.10.13  北海道大学

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    Event date: 2022.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 ビジョンセンター東京八重洲南口   Country:Japan  

  101. 日米欧中のxEV分解から見える次世代パワー半導体の車載応用戦略と10年先のxEV市場を勝ち取るパワー半導体応用技術について Invited

    山本真義

    三菱UFJモルガン・スタンレー証券・ラージセミナー講演  2022.10.11  三菱UFJモルガン・スタンレー証券

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    Event date: 2022.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  102. EV最新技術動向(中国編)(欧州編) Invited

    山本真義

    テクトロニクス新技術セミナ2022 刈谷  2022.9.30  株式会社テクトロニクス&フルーク

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    Event date: 2022.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:愛知県 刈谷市産業振興センター   Country:Japan  

  103. 電動車両向けパワー変換ユニット動向 Invited

    山本真義

    山口県 電動車関連部品展示説明会  2022.9.15  山口県 産業戦略部

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    Event date: 2022.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:山口県 産業技術センター   Country:Japan  

  104. 宏光 MINI EV(上汽通用五菱汽車)の分解による低コスト化技術解説と IONIQ 5(現代自動車)に搭載された SiC インバーターの分解解析レポート Invited International coauthorship

    山本真義

    2022年度第4回ASIFセミナー  2022.9.12  公益財団法人中部科学技術センター

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    Event date: 2022.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:名古屋 栄ガスビル   Country:Japan  

  105. 日米欧中のxEV分解から見える次世代パワー半導体の車載応用戦略と10年先のxEV市場を勝ち取るパワー半導体応用技術 Invited

    山本真義

    NE先端テクノロジーフォーラム2022  2022.9.9  株式会社 日経BP

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    Event date: 2022.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 コモレ四谷タワーコンファレンス   Country:Japan  

  106. 次世代ハイブリッド航空機におけるシステムシミュレーションモデルの構築 International conference

    渋谷賢佑・山東貴光・重松浩一・今岡 淳・山本真義

    電気学会 2022年 産業応用部門大会  2022.8.30  電気学会

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    Event date: 2022.8 - 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  107. プレーナー巻線への巻線比率構造適用によるインダクタの高性能化

    長谷沼 篤・今岡 淳・山本真義

    電気学会 2022年 産業応用部門大会  2022.9.1  電気学会

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    Event date: 2022.8 - 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  108. 回路平衡化によるブリッジレスフライバックPFC整流器のコモンモードノイズ低減

    尹 奕琨, 崔 時熏, 辛 宗元, 佐々木守, 今岡 淳, 山本真義

    電気学会 2022年 産業応用部門大会  2022.8.30  電気学会

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    Event date: 2022.8 - 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  109. 低次高調波成分を抑制する三相電圧形インバータのPWM法

    塩山 知, 佐藤伸二, 山本真義, 今岡 淳

    電気学会 2022年 産業応用部門大会  2022.8.30  電気学会

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    Event date: 2022.8 - 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  110. Sパラメータを用いた寄生容量の測定方法

    佐々木 守・今岡 淳・山本真義

    電気学会 2022年 産業応用部門大会  2022.8.31  電気学会

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    Event date: 2022.8 - 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  111. 多相ブーストコンバータのエアーキャップとパウダコアーを用いた結合インダクタ設計の検討

    S. Choi, J. Imaoka, M. Yamamoto

    電気学会 2022年 産業応用部門大会  2022.9.1  電気学会

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    Event date: 2022.8 - 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学   Country:Japan  

  112. GaN HEMT を適用した 27.12MHz 駆動 E 級インバータ(ペーパ・コンバータ)の可変パルス幅変調方式の具現化 Invited

    山本真義

    令和4年度 電気・電子・情報関係学会 東海支部連合大会  2022.8.30  電気学会東海支部

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    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:愛知県名古屋市   Country:Japan  

  113. フルブリッジ LLC コンバータへの回路平衡化適用による部品増加を伴わないコモンモードノイズ抑制手法

    永井友崇,今岡淳,山本真義

    令和4年度 電気・電子・情報関係学会 東海支部連合大会  2022.8.29  電気学会東海支部

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    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  114. 直列型LC共振インバータを駆動するパワーMOSFETのスイッチング動作と損失解析

    新井大輔、大矢根 蒼、今岡 淳、山本真義

    令和4年度 電気・電子・情報関係学会 東海支部連合大会  2022.8.29  電気学会東海支部

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    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  115. 令和四年度 電気・電子・情報関係学会 東海支部連合大会企画セッション対応「カーボンニュートラルを支えるパワーエレクトロニクスの要素技術」 Invited

    山本真義

    令和四年度 電気・電子・情報関係学会 東海支部連合大会  2022.8.29  電気・電子・情報関係学会

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    Event date: 2022.8

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  116. 2030年のxEVの予想像とそこに使用されるパワーエレクトロニクス機器用電子部品・材料・実装ぎじゅつへの期待と課題 Invited

    山本真義

    電子情報技術産業協会(JEITA)  2022.8.5  電子情報技術産業協会(JEITA)

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    Event date: 2022.8

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  117. 全ての電気自動車を分解して分かった!各社の技術動向からみる、電気自動車の最新動向と技術予測 Invited

    山本真義

    2022年第1回電子技術分科会技術講演会  2022.7.26  電子技術分科会

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  118. 日米欧中の各経済圏におけるEV戦略と各自動車メーカーEVの電動パワートレイン分解から読み解く今後求められる金型技術 Invited

    山本真義

    日本金型工業会  2022.7.25  (一社)日本金型工業会講演会

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  119. IONIQ 5(ヒュンデ)・タイカン(ポルシェ)・e-tron(アウディ)分解から読み解く車載用パワーエレクトロニクスにおけるEMC問題とその対策技術 Invited

    山本真義

    テクノフロンティア2022 EMC設計・対策技術シンポジウム 自動車&コンポーネント  2022.7.28  一般社団法人 日本能率協会

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  120. 「電動化の最前線にせまる 自動車メーカーのEV戦略と加速する技術革新」 Invited

    山本真義

    第二回次世代自動車オンラインセミナー  2022.7.22  公益財団法人 岐阜県産業経済振興センター

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  121. ID.3のインバーター実装技術と車載充電器の分解分析 Invited

    山本真義

    「TECHNO-FRONTIER 2022」(フォルクスワーゲンの新型EV「ID.3」の分解調査)  2022.7.20  一般社団法人 日本能率協会

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 東京ビッグサイト   Country:Japan  

  122. D3.最新EV用パワエレ受動素子(キャパシタ・インダクタ) Invited

    山本真義

    「TECHNO-FRONTIER 2023」(電源システム技術シンポジウム コーディネータ)  2022.7.22  一般

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  123. MIRAIのインバーター、昇圧回路の分解分析 Invited

    山本真義

    「TECHNO-FRONTIER 2022」(トヨタ自動車の新型FCV「MIRAI」の分解調査)  2022.7.21  一般社団法人 日本能率協会

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 東京ビッグサイト   Country:Japan  

  124. 最新EV用パワエレ受動素子(キャパシタ・インダクタ)搭載事例・研究開発最前線

    山本真義

    テクノフロンティア2022  2022.7.14  一般社団法人 日本能率協会

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  125. 中国製50万円EV(五菱・宏光MINI EV)の分析解説と新EV時代における岡山企業が執るべき事業戦略 Invited

    山本真義

    EV関連技術情報発信セミナー  2022.7.5  岡山県産業振興財団講演会

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    Event date: 2022.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:岡山県 ホテルメルパルク岡山   Country:Japan  

  126. 日米欧の分解から読み解く2025年のEV像とそこに求められるパワーエレクトロニクス実装最前線 Invited

    山本真義

    JIEP最先端実装技術シンポジウム  2022.6.16  一般社団法人 エレクトロニクス実装学会

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    Event date: 2022.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 東京ビッグサイト   Country:Japan  

  127. 車載用パワーエレクトロニクス技術最新動向とSiC/GaN適用の事例と可能性に関する議論 Invited

    山本真義

    NEDIA主催 電子デバイス研修講座(専門講演)  2022.6.13  一般社団法人 日本電子デバイス産業協会

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    Event date: 2022.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 学士会館   Country:Japan  

  128. 日米欧中の自動車メーカーEV分解から読み解く2025年のEV像

    山本真義

    インダストリーテクノロジーフェア  2022.6.12  ITメディア

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    Event date: 2022.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  129. 中国製49万円電気自動車(宏光・五菱)分析から読み解く我が国が執るべき電気自動車戦略と2030年の電気自動車勢力マップ予想 Invited

    山本真義

    東京理科大学EVシンポ 2022年  2022.6.4  東京理科大学

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    Event date: 2022.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 東京理科大学   Country:Japan  

  130. 台日交流を加速させる各プロジェクト紹介と10年以内に台日両国に求められる技術交流分野の拠点化 Invited

    山本真義

    日台交流会  2022.5.28  台湾留日学人座談会

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    Event date: 2022.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:Japan  

  131. 日米欧中のEV戦略と各自動車メーカーが求めるEV用材料 Invited

    山本真義

    一般社団法人日本金型工業会西部支部総会  2022.5.26  一般社団法人日本金型工業会西部支部

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    Event date: 2022.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:大阪 大阪科学技術センター   Country:Japan  

  132. 2030年の電気自動車予想像と広島県自動車関連企業の執るべき戦略 Invited

    山本真義

    東友会 新技術委員会  2022.5.19  東友会協同組合

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    Event date: 2022.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  133. 日米欧中の電気自動車(EV)戦略と2030年の電気自動車予想像とその自動運転におけるLSIの役割 Invited

    山本真義

    LSIとシステムのワークショップ2022  2022.5.9  一般社団法人 電子情報通信学会 集積回路研究専門委員会

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    Event date: 2022.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京 東京大学   Country:Japan  

  134. 日米欧中の電気自動車(EV)戦略と2030年の電気自動車予想像 Invited

    山本真義

    弁理士会講演会  2022.2.19  弁理士会

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    Event date: 2022.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  135. 航空機電動化に向けた高電力密度インバータ設計手法の各リスト実証 Invited

    山本真義

    知の拠点あいち公開セミナー  2022.2.17  知の拠点重点研究プロジェクト統括部

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    Event date: 2022.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  136. 2030年の次世代自動車像とそれを支える電動化テクノロジー

    山本真義

    第4回未来のクルマTechnology  2022.2.16  株式会社JTBコミュニケーションデザイン

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    Event date: 2022.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  137. 宏光MINI EV(中国・五菱)の分解解説ならびに2030年の電気自動車予想像と広島県自動車関連企業の執るべき戦略 Invited

    山本真義

    広島市ものづくり支援化  2022.2.1  広島市 経済観光局産業振興部

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    Event date: 2022.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  138. 日米欧中の電気自動車(EV)戦略と各自動車メーカが求めるEV用材料・素材・パワーエレクトロニクス応用技術最前線 Invited

    山本真義

    山口県産業戦略部オンラインセミナー  2022.1.20  山口県 産業戦略部

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    Event date: 2022.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  139. 宏光MINI EVセミナー

    山本真義

    宏光MINI EVセミナー  2021.12.14  一般社団法人日本能率協会

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    Event date: 2021.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:愛知県名古屋市   Country:Japan  

  140. 次世代自動車2030年ロードマップとそれを支える次世代パワー半導体実装基板技術 Invited

    山本真義

    IMSIオープンフォーラム2021  2021.12.9  一般社団法人電子実装工学研究所

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    Event date: 2021.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  141. Next Generation Electric Vehicle in 2030 and Module Packaging and Bonding of Next Generation Power Semiconductor Device for Its Automotive Applications Invited International conference

    2021.12.9 

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (keynote)  

    Country:Japan  

  142. 車載用パワーエレクトロニクス技術最新動向とSiC/GaN適用の事例と可能性に関する議論 Invited

    山本真義

    NEDIAパワーエレクトロニクス講座  2021.12.3  財団法人 日本電子デバイス産業協会

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    Event date: 2021.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  143. 宏光MINI EVセミナー

    山本真義

    宏光MINI EVセミナー  2021.11.30  一般社団法人日本能率協会

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    Event date: 2021.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:愛知県名古屋市   Country:Japan  

  144. 主要国における電気自動車の開発動向と我が国が執るべき カーボンニュートラルに向けた電気自動車の市場戦略 Invited

    山本真義

    パワーエレクトロニクス学会  2021.11.20  パワーエレクトロニクス学会

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  145. 電動車・パワコン・家電民生機器におけるECM対策技術最前線と各応用パワーエレクトロニクス機器分解解説 〜テスラ・モデル3、ジャガー・I-Pace、ポルシェ・タイカン、ファーウェイ製パワコンを中心に〜 Invited

    山本真義

    テクノフェア  2021.11.15  北川工業

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  146. 日米欧中の電気自動車(EV)戦略と2030年の電気自動車予想像 Invited

    山本真義

    日本弁理士会講演会  2021.11.12  日本弁理士会

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  147. EV用パワーエレクトロニクス機器の最新技術・市場動向と次世代EVに求められるパワエレ実装技術 Invited

    山本真義

    福岡大学半導体実装研究所講演会  2021.11.11  福岡大学

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:福岡県福岡市   Country:Japan  

  148. SiC/GaN Hybrid Soft Switching Inverter for Electric Vehicle Applications International conference

    2021.11.6 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (keynote)  

    Country:Japan  

  149. EV用車載パワーエレクトロニクスシステム最新動向と次世代EVに求められるパワエレ実装技術 Invited

    山本真義

    電子機器のトータルソリューション展  2021.10.28  日本貿易振興機構

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    Event date: 2021.10

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京ビッグサイト   Country:Japan  

  150. 日米欧中の電気自動車(EV戦略と各自動車メーカのEV用パワーエレクトロニクス応用技術最前線 Invited

    山本真義

    日本弁理士会講演会  2021.10.21  日本弁理士会講演会

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    Event date: 2021.10

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  151. 世界標準化される電気自動車用パワーエレクトロニクスの技術動向と車載用磁性材料へ の期待に関する講演)

    山本真義

    日本ボンド磁性材料協会(JABM)講演会  2021.9.17  日本ボンド磁性材料協会

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  152. EV用車載パワーエレクトロニクスシステム最新動向と次世代EVに求められるパワエレ実装技術 Invited

    山本真義

    カーエレクトロニクス研究会  2021.9.15  エレクトロニクス実装学会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  153. 日米欧中のEV用パワー半導体戦略と各自動車メーカの EV用パワーエレクトロニクス応用技術最前線 Invited

    山本真義

    NE先端テクノロジーフォーラム  2021.9.10  日経エレクトロニクス

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  154. パワーコントロールユニット(PCU)における高出力密度を実現する各要素技術と動向 Invited

    山本真義

    産業応用部門大会シンポジウムセッション講演  2021.8.27  電気学会

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    Event date: 2021.8

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:オンライン   Country:Japan  

  155. 超高速GaNパワー半導体応用におけるノイズ発生メカニズムと 高速スイッチングに起因するノイズの効果的な抑制法 Invited

    山本真義

    応用物理学会 先進パワー半導体分科会  2021.7.30  応用物理学会

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    Event date: 2021.7

    Language:Japanese  

    Venue:名古屋大学   Country:Japan  

  156. 次世代自動車におけるパワーエレクトロニクス機器の1kV化技術動向とそこに求められるワイドバンドギャップパワー半導体応用技術

    山本真義

    ワイドバンドギャップ学会講演会  2021.7.16  ワイドギャップ半導体学会研究会

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    Event date: 2021.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  157. 次世代自動車に要求されるSiC/GaNパワーデバイス実装・接合技術と欧米メーカ(テスラ・ジャガー等)のインバータ実装技術紹介 Invited

    山本真義

    日本溶接協会はんだ・微細接合部会シンポジウム  2021.7.5  日本溶接協会

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    Event date: 2021.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  158. I-Pace(ジャガー)用インバータの概要と実装手法

    山本真義

    テクノフロンティアセミナー  2021.7.1  一般社団法人日本能率協会

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    Event date: 2021.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  159. 北米・欧州・日本の各EV分解から読み解くパワー半導体とそのモジュール・システム 技術最新動向とパワー半導体応用設計思想 Invited

    山本真義

    パワーデバイス用シリコン および関連半導体材料に関する研究会  2021.6.24  一般財団法人ファインセラミックスセンター

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    Event date: 2021.6

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:オンライン  

  160. 3 I-PACE(ジャガー)・モデル3(テスラ)のインバータ分解から読み解く 車載用熱対策技術最前線とその技術動向 Invited

    山本真義

    テクノフロンティアセミナー  2021.6.10  一般社団法人日本能率協会

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    Event date: 2021.6 - 2021.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  161. 各自動車メーカ最新モデル分解から読み解く車載用パワーエレクトロニクス技術 最前線 ~I-PACE(ジャガー)・モデル3(テスラ)・MIRAI(トヨタ)~ Invited

    山本真義

    テクノフロンティアセミナー  2021.6.18  一般社団法人日本能率協会 

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    Event date: 2021.6 - 2021.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  162. モデル3(テスラ)用SiCバッテリ充電器における 最新ノイズ対策技術とSiC/GaN時代のノイズ対策技術動向 Invited

    山本真義

    テクノフロンティアセミナー  2021.7.7  一般社団法人日本能率協会

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    Event date: 2021.6 - 2021.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  163. 電気自動車向けパワーエレクトロニクス機器の各国における研究開発状況と今後の技術動向 Invited International coauthorship International conference

    山本真義

    日本電気学会:岩崎コンファレンス  2021.5.20  日本電気学会

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    Event date: 2021.5

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  164. EVにおけるPCU及びパワーモジュールの実装・組立技術の開発動向

    山本真義

    ジャパンマーケティングサーベイ  2021.3.30  ジャパンマーケティングサーベイ

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    Event date: 2021.3

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  165. 名古屋大学におけるGan半導体による電力変換等の研究について

    山本真義

    電源部品事業委員会 JEITA  2021.3.23  電子情報技術産業協会

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    Event date: 2021.3

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  166. MHzワイヤレス給電を実現する高周波パワー半導体スイッチング技術とその応用事例

    山本真義

    WPT研究会  2021.3.22  WPTシステム研究会

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    Event date: 2021.3

    Presentation type:Symposium, workshop panel (nominated)  

    Venue:オンライン   Country:Japan  

  167. 先進モビリティとパワーエレクトロ二クス技術の進化 Invited

    山本真義

    応用物理学会春季学術講演会  2021.3.17  応用物理学会

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  168. 航空機電動化に向けた高電力密度インバータ設計手法の確立と実証

    山本真義

    知の拠点公開セミナー  2021.3.15  知の拠点あいち

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    Event date: 2021.3

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:愛知県長久手市 知の拠点あいち   Country:Japan  

  169. Teslaモデル3分解から読み解く車載応用における技術トレンド Invited

    山本真義

    自動車問題研究会   2021.2.16  自動車問題研究会

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    Event date: 2021.2

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:愛知県名古屋市 フォーイン2階多目的ホール   Country:Japan  

  170. 電動車両技術の最新動向

    山本真義

    自動車技術会シンポジウム  2021.2.12  自動車技術会電気動力技術部門委員会

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    Event date: 2021.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  171. 次世代パワーエレクトロニクスを革新する高周波・大容量対応パワーマグネティックス応用技術 〜次世代自動車用磁気部品応用技術を例に〜

    山本真義

    マグネティックスによるパワーエレクトロニクスの革新と協創  2021.1.20  電気学会マグネティックス技術委員会

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    Event date: 2021.1

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:オンライン   Country:Japan  

  172. 次世代パワー半導体が切り開くモビリティ・インフラ用電力機器の将来と市場可能性

    山本真義

    オンライン  2020.12.18  中部電力

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    Event date: 2020.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  173. 次世代バワー半導体の開発と空飛ぶクルマへの適用

    山本真義

    テクノフロンティアセミナー  2020.12.3  産業能率協会

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    Event date: 2020.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  174. パワエレ技術の最新動向

    山本真義

    愛知県モノづくり技術者のための パワエレセミナー  2020.12.1 

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    Event date: 2020.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  175. 自動車におけるパワーエレクトロ二クス技術が果たす役割と展望 Invited

    山本真義

    応用物理学会  2020.11.28  応用物理学会

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  176. テスラ・モデル3の分解から読み解くテスラモーターズ社が考えるパワー半導体応用戦略とそこから予測する次世代自動車像

    山本真義

    電動車両のPCUの高性能化に関する共同研究委員会  2020.11.13  電動車両のPCUの高性能化に関する共同研究委員会

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    Event date: 2020.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  177. テスラ・モデル3分解から読み解くパワー半導体応用戦略とそこから予測する次世代自動車

    山本真義

    EVEX EV-PHV普及活用技術展  2020.11.6  エヌプラス

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    Event date: 2020.11

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:東京都   Country:Japan  

  178. 車載応用におけるパワー半導体の熱設計・信頼性技術最前線~テスラ・モデル3分解~読み解くパワー半導体パッケージ戦力~

    山本真義

    ネプコンジャパン  2020.10.22  リードエグジビションジャパン

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    Event date: 2020.10

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:愛知県名古屋市   Country:Japan  

  179. テスラ「モデル3」徹底分解セミナー ~分解したらここまで分かる、テスラが示す未来のクルマ~

    山本真義

    日経BP講演会 テスラ分解  2020.9.18  日経BP

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    Event date: 2020.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

  180. 航空機電動化

    山本真義

    ÉCLAIRコンソーシアム  2020.9.14  JAXA

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    Event date: 2020.9

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:オンライン   Country:Japan  

▼display all

Other research activities 1

  1. ⾮接触受電装置および⾮接触給電システム

    2020.10

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    特許出願 特願2021- 19679
    発明者 大矢根 蒼、山本 真義

Research Project for Joint Research, Competitive Funding, etc. 46

  1. 低損失・低ノイズ インバータ研究

    Grant number:22100305-0  2022.7 - 2024.9

    国立研究開発国立研究開発法人新エネルギー・産業技術総合開発機構(NEDO)  革新的な誘導モーター開発による低価格・省資源・高性能トラクションモーターの実用化  受託研究費

    山本真義

      More details

    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\241570990 ( Direct Cost: \185824990 、 Indirect Cost:\55746000 )

  2. EV開発におけるX線CT及びCPEの活用可能性検証

    2023.12 - 2024.3

    超大型X線CT装置等を活用した産業のデジタル化技術の開発等に関する調査研究事業  受託研究

    山本真義

      More details

    Grant type:Competitive

    Grant amount:\3999600 ( Direct Cost: \3636000 、 Indirect Cost:\363600 )

  3. 次世代モビリティ向けフィルムコンデンサ用高耐熱フィルムの開発

    Grant number:23200523-0  2023.9 - 2026.7

    脱炭素社会実現に向けた省エネルギー技術の研究開発・社会実装促進プログラム  共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4400000 ( Direct Cost: \3385800 、 Indirect Cost:\1014200 )

  4. 燃料電池航空機の革新的エネルギー転換、推進システム技術の研究

    2023.8 - 2026.3

    国立研究開発法人新エネルギー・産業技術総合開発機構(NEDO)  NEDO先導研究プログラム  受託研究

    山本真義

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\10400000 ( Direct Cost: \8000000 、 Indirect Cost:\2400000 )

  5. 沸騰冷却方式SiCインバータ内蔵インホイールモータの開発

    Grant number:23200569-0  2023.7 - 2025.3

    脱炭素社会実現に向けた省エネルギー技術の研究開発・社会実装促進プログラム  共同研究

    山本真義

      More details

    Grant type:Competitive

    Grant amount:\17000000 ( Direct Cost: \13077000 、 Indirect Cost:\3923000 )

  6. 高出力密度モータ用コントローラの高密度化に関する研究

    2022.7 - 2024.9

    国立研究開発法人 新エネルギー・産業技術総合開発機構(NEDO)  脱炭素社会実現に向けた省エネルギー技術の研究開発・社会実装促進プログラム  共同研究

    山本真義

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\20000000 ( Direct Cost: \15386000 、 Indirect Cost:\4614000 )

  7. 未来のあるべき社会・ライフスタイルを創造する技術イノベーション事業

    2019.4 - 2027.3

    受託研究費

    山本真義

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\109842000 ( Direct Cost: \48653891 、 Indirect Cost:\3463000 )

  8. 300W級空冷 13.56MH Multi-Ch. Power Amplifier設計に関する研究

    2024.1 - 2025.2

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\10400000 ( Direct Cost: \8000000 、 Indirect Cost:\2400000 )

  9. SiCパワーモジュール並列接続におけるゲート駆動回路の研究

    2024.1 - 2024.12

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\6240000 ( Direct Cost: \4800000 、 Indirect Cost:\1440000 )

  10. GaN普及のためのアプリケーション技術開発

    2023.11 - 2024.6

    受託事業

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\2000000 ( Direct Cost: \1538462 、 Indirect Cost:\461538 )

  11. 高周波コンバータ向け磁気部品に関する共同研究

    2023.8 - 2024.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\4950000 ( Direct Cost: \3807692 、 Indirect Cost:\1142308 )

  12. 次世代WBGパワーデバイスをコンポーネントい適用のための要素技術に関する研究

    2023.7 - 2024.12

    共同研究

    山本真義

      More details

    Authorship:Principal investigator 

    Grant amount:\14285000 ( Direct Cost: \10650000 、 Indirect Cost:\3635000 )

  13. 電力変換装置小型軽量化に向けたパワーエレクトニクス回路解析の高精度化及び電力変換装置の低ノイズ化に寄与するゲート駆動回路の検討

    2023.5 - 2024.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator 

    Grant amount:\3300000 ( Direct Cost: \2538642 、 Indirect Cost:\761538 )

  14. 高耐熱フィルムコンデンサ用フィルムの研究

    2023.4 - 2024.3

    受託事業

    山本真義

      More details

    Authorship:Other  Grant type:Other

    Grant amount:\675000 ( Direct Cost: \472500 、 Indirect Cost:\202500 )

  15. 電動パワートレインにおけるセラミック軸受けでの絶縁によるノイズ低減効果の検証

    2023.4 - 2024.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\3500000 ( Direct Cost: \2300000 、 Indirect Cost:\1200000 )

  16. ノイズを熱に変換する新構造ノイズフィルタHRFに関する研究

    2023.2 - 2024.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\1600000 ( Indirect Cost:\1600000 )

  17. 縦型GaN-MOSFETで構成する高効率コンバータ/インバータの研究

    2023.1 - 2025.1

    受託研究費

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\9999600 ( Direct Cost: \7692000 、 Indirect Cost:\2307600 )

  18. ノイズを熱に変換する新構造ノイズフィルタ「HRF」に関する研究

    2023.1 - 2024.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\300000

  19. インバータ及びパワーモジュールのベンチマークによる次世代パワーモジュール設計に関する研究

    2022.12 - 2024.12

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\14285000 ( Direct Cost: \10650000 、 Indirect Cost:\3635000 )

  20. パワーエレクトロニクス技術の伝授

    2022.11 - 2024.9

    受託事業費

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\4079500 ( Direct Cost: \2855650 、 Indirect Cost:\1223850 )

  21. 車両向けパワーエレクトロニクス技術の伝授

    2022.1 - 2023.3

    受託事業費

    山本真義

      More details

    Grant type:Collaborative (industry/university)

    Grant amount:\1346000

  22. 車載向け高周波 絶縁インダクタの研究

    2021.11 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator 

    Grant amount:\3261000 ( Direct Cost: \3076000 、 Indirect Cost:\185000 )

  23. 次世代LED用電源技術の共同研究

    2021.11 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator 

    Grant amount:\2120000 ( Direct Cost: \2000000 、 Indirect Cost:\120000 )

  24. 長距離・大電力のワイヤレス電力伝送技術の研究

    2021.10 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator 

    Grant amount:\1166000 ( Direct Cost: \1100000 、 Indirect Cost:\66000 )

  25. ウイルス不活化機能をもつ個人装用型送気服および送気フェイスシールド

    2021.4 - 2022.4

    受託研究費

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3600000 ( Direct Cost: \3600000 )

  26. 電磁波制御技術に関する研究

    2021.4 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\2077000 ( Direct Cost: \1966000 、 Indirect Cost:\111000 )

  27. SiCを適用した昇圧DC/DCコンバータのノイズ対策技術の研究

    2021.4 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator 

    Grant amount:\2120000 ( Direct Cost: \2000000 、 Indirect Cost:\120000 )

  28. パワーエレクトロニクス技術、パワーコンディショナー及び交流

    2020.11 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator 

    Grant amount:\385000 ( Direct Cost: \385000 )

  29. GaNパワーデバイス 革新的な省CO2実現のための部材や素材の社会実装・普及展開加速化事業

    2020.10 - 2022.3

    山本真義

      More details

    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\29952000 ( Direct Cost: \26133000 、 Indirect Cost:\3819000 )

  30. ツイスト熱電対のノイズ対策についての研究

    2020.10 - 2022.3

    山本真義

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    Authorship:Principal investigator  Grant type:Collaborative (industry/university)

    Grant amount:\814000 ( Direct Cost: \800000 、 Indirect Cost:\14000 )

  31. 次世代自動車電動部品向け新規高機能性薄物シート連続製造技術

    2020.8 - 2022.3

    補助金等

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\1321000 ( Direct Cost: \1321000 )

  32. ワイドバンドギャップ半導体を用いた電動システムにおけるノイズ対策の研究

    2020.6 - 2021.12

    共同研究

    山本真義

      More details

    Grant type:Other

    Grant amount:\6997000 ( Direct Cost: \6703000 、 Indirect Cost:\294000 )

  33. インバータ回路におけるシャント抵抗を用いたソフトスイッチング

    2020.6 - 2021.3

    山本真義

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    Authorship:Principal investigator  Grant type:Other

    Grant amount:\1338000 ( Direct Cost: \1269000 、 Indirect Cost:\69000 )

  34. GaNを適用したLLC共振絶縁DC/DCコンバータのノイズ対策技術の研究

    2020.5 - 2021.3

    山本真義

      More details

    Grant type:Other

    Grant amount:\1607000 ( Direct Cost: \1538000 、 Indirect Cost:\69000 )

  35. 航空機電動化に向けた高電力密度インバータ設計手法の確立と実証

    2020.4 - 2022.3

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\21994000 ( Direct Cost: \21271000 、 Indirect Cost:\599000 )

  36. ブラシモータ装置の電磁ノイズ解析技術

    2020.4 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\1630000 ( Direct Cost: \1538000 、 Indirect Cost:\92000 )

  37. 省エネルギー社会の実現に資する次世代半導体研究開発

    2020.4 - 2021.3

    山本真義

      More details

    Grant amount:\52250000 ( Direct Cost: \50000000 、 Indirect Cost:\2250000 )

  38. 小型・軽量・高効率・低EMC電源を実現する電源基板設計技術

    2020.2 - 2021.3

    山本真義

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    Grant type:Other

    Grant amount:\124000 ( Direct Cost: \113000 、 Indirect Cost:\11000 )

  39. 低CO2エミッション航空機実現に向けた推進用高出力密度電気モータシステムの研究開発

    2019.11 - 2021.7

    受託研究費

    山本真義

      More details

    Grant type:Competitive

    Grant amount:\17270000 ( Direct Cost: \13387000 、 Indirect Cost:\733000 )

  40. エネルギーマネジメント展開に関する共同研究

    2019.4

    山本真義

      More details

    Grant type:Collaborative (industry/university)

    Grant amount:\256000 ( Direct Cost: \256000 )

  41. 次世代自動車の車内快適性に関する包括的共同研究

    2019.4 - 2021.3

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Collaborative (industry/university)

    Grant amount:\100000 ( Direct Cost: \100000 )

  42. 高速スイッチング回路基盤技術の開発

    2018.11 - 2023.3

    受託研究費

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\81975000 ( Direct Cost: \74019000 、 Indirect Cost:\7956000 )

  43. GaNパワーエレクトロニクスに関する研究

    2018.10 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\800000 ( Direct Cost: \614000 、 Indirect Cost:\186000 )

  44. GaNパワーエレクトロニクスに関する研究

    2018.10 - 2021.3

    山本真義

      More details

    Grant type:Other

    Grant amount:\815000 ( Direct Cost: \769000 、 Indirect Cost:\46000 )

  45. 高出力インバータ回路の開発

    2018.4 - 2021.3

    山本真義

      More details

    Grant amount:\804000 ( Direct Cost: \769000 、 Indirect Cost:\35000 )

  46. 新磁性材料インダクタコアの応用検討

    2017.10 - 2022.3

    共同研究

    山本真義

      More details

    Authorship:Principal investigator  Grant type:Other

    Grant amount:\2341000 ( Direct Cost: \2112000 、 Indirect Cost:\229000 )

▼display all

KAKENHI (Grants-in-Aid for Scientific Research) 2

  1. トンネル用LED照明装置

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    Grant type:Competitive

    トンネル用LED照明装置の高効率化、低ノイズ化を実現する

  2. 電気自動車用電源装置の小型軽量化

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    Grant type:Competitive

    車載用電源装置のマルチフェーズ化によるインダクタ部、キャパシタ部の小型軽量化

 

Teaching Experience (On-campus) 61

  1. First Year Seminar

    2023

  2. Advanced Experiments and Exercises in Automotive Engineering B

    2023

  3. Automotive Engineering Seminar 1D

    2023

  4. Automotive Engineering Seminar 1B

    2023

  5. Advanced Experiments and Exercises in Electric Engineering

    2023

  6. Power Electronics Seminar 1C

    2023

  7. Power Electronics Seminar 1A

    2023

  8. Advanced Experiments and Exercises in Automotive Engineering B

    2023

  9. AutomotiveEngineering Seminar 1D

    2023

  10. Automotive Engineering Seminar 1B

    2023

  11. Theory of Data Analysis and Processing

    2023

  12. Graduation Research B

    2023

  13. Graduation Research B

    2023

  14. Power Electronics Seminar 2E

    2023

  15. Power Electronics Seminar 2C

    2023

  16. Power Electronics Seminar 2A

    2023

  17. Advanced Experiments and Exercises in Automotive Engineering A

    2023

  18. Automotive Engineering Seminar 1C

    2023

  19. Automotive Engineering Seminar 1A

    2023

  20. Advanced Lectures on Power Electronics Applications

    2023

  21. Power Electronics Seminar 1D

    2023

  22. Power Electronics Seminar 1B

    2023

  23. Power Electronics

    2023

  24. Power Electronics Seminar 2D

    2023

  25. Power Electronics Seminar 2B

    2023

  26. Magoya University Summer Intensive Program

    2023

  27. 先進モビリティ学基礎

    2023

  28. Graduation Research B

    2022

  29. Graduation Research B

    2022

  30. Graduation Research B

    2022

  31. Graduation Research B

    2022

  32. Advanced Experiments and Exercises in Automotive Engineering B

    2022

  33. Automotive Engineering Seminar 1B

    2022

  34. Advanced Experiments and Exercises in Electric Engineering

    2022

  35. Power Electronics Seminar 1C

    2022

  36. Power Electronics Seminar 1A

    2022

  37. Power Electronics Seminar 2E

    2022

  38. Power Electronics Seminar 2C

    2022

  39. Power Electronics Seminar 2A

    2022

  40. Graduation Research A

    2022

  41. Power Electronics

    2022

  42. Graduation Research A

    2022

  43. Power Electronics Seminar 2B

    2022

  44. Power Electronics Seminar 2D

    2022

  45. Advanced Lectures on Power Electronics Applications

    2022

  46. Power Electronics Seminar 1D

    2022

  47. Power Electronics Seminar 1B

    2022

  48. データ解析処理論

    2022

  49. 先進モビリティ学基礎

    2022

  50. 基礎科目:データー解析諸理論

    2022

     詳細を見る

    パワーデバイスの実験波形とノイズ周波数

  51. Electric Circuits with Exercises

    2020

  52. Advanced Experiments and Exercises in Electric Engineering

    2020

  53. Advanced Lectures on Power Electronics Applications

    2020

  54. Power Electronics Seminar 1D

    2020

  55. Power Electronics Seminar 1C

    2020

  56. Power Electronics Seminar 2E

    2020

  57. Power Electronics Seminar 2C

    2020

  58. Power Electronics Seminar 2B

    2020

  59. Power Electronics Seminar 2A

    2020

  60. power Electronics

    2020

  61. Power Electronics

    2020

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Teaching Experience (Off-campus) 1

  1. 特別講義 2030年の次世代電気自動車像とそこで使われるパワーエレクトロニクス応用技術最前線

    2021.12 Okayama University)

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    Level:Undergraduate (specialized)  Country:Japan

 

Social Contribution 10

  1. パワー半導体が帰る新しい電気自動車のはなし

    Role(s):Lecturer

    名古屋大学  名古屋大学オープンレクチャー2023  2023.3

  2. Ami分解大会

    Role(s):Lecturer, Demonstrator

    日本能率協会  Ami分解大会  2023.12

  3. 本研究室ベンチャー企業が東京オートサロン2023に出展

    Role(s):Advisor

    東京オートサロン事務局  TOKYO AUTO SALON 2023  2023.1

  4. 「NIO(上海蔚来汽車)『ES8』」分解大会

    Role(s):Lecturer, Advisor, Informant, Organizing member, Demonstrator

    一般社団法人日本能率協会  「NIO(上海蔚来汽車)『ES8』」分解大会  2022.10

  5. 本研究室発ベンチャーのナチュラニクスがJETROが主催する日ASEANにおけるアジアDX促進事業に採択 株式会社ナチュラニクス

    Role(s):Advisor

    日本貿易振興機構(JETRO)  日ASEANにおけるアジアDX促進事業 第3回公募における採択事業  2022.8

  6. 名古屋大学発ベンチャー企業「ABILITY」設立

    Role(s):Advisor, Organizing member

    ABILITY株式会社  https://a.bility.co.jp/  2022.8

  7. 本研究室がクラウドファンディング成功した事業がベンチャー企業化に成功

    Role(s):Advisor, Organizing member

    先端教育  先端教育  2022.2 - 2022.12

  8. 2030年の自動車像を予測する ~電気自動車の世界市場展開と新材料半導体~

    Role(s):Lecturer

    名古屋大学  サイエンスフェスティバル2021  2021.11

  9. 次世代パワー半導体が切り開く次世代自動車・航空機・宇宙探査機の世界

    Role(s):Lecturer

    名古屋大学  アカデミックナイト  2020.11

  10. 電気は空へ~電動バイクや電動航空機、宇宙用ロケットや月面探査車の最前線~

    Role(s):Lecturer

    名古屋大学  サイエンスフェスティバル2020  2020.9

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Media Coverage 46

  1. NHKスペシャル 半導体大競争時代 TV or radio program

    NHK  NHKスペシャル 半導体大競争時代  https://www.nhk.jp/p/special/ts/2NY2QQLPM3/episode/te/Z6ZPGX4NN1/  2023.1

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    Author:Myself 

  2. 自動車・ものづくり業界に与える半導体のインパクト~ TV or radio program

    日本経済新聞社  NIKKEI半導体シンポジウム  2024.2

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    Author:Myself 

  3. 車載用ノイズ対策技術最前線 Newspaper, magazine

    科学情報出版株式会社  月刊EMC  P61~74  2024.2

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    Author:Myself 

  4. EVの技術解析で国内産業を支える Newspaper, magazine

    日刊自動車新聞社  2023.12

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    Author:Myself 

  5. 車載用パワーエレクトロニクス機器におけるノイズ発生メカニズムの基本と電気自動車におけるノイズ対策技術最前線 Newspaper, magazine

    科学情報出版  月刊EMC  P22~31  2023.12

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    Author:Myself 

  6. EV普及との相乗効果 Newspaper, magazine

    東洋経済新報社  週刊東洋経済  2023.11

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    Author:Other 

  7. 半導体の論点・第3世代が到来 Internet

    日経BP  日経ビジネス  2023.10

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    Author:Myself 

  8. 各社BEVのインバータ分解解析と次世代BEVに求められるパワーエレクトロニクス応用技術 Newspaper, magazine

    技術情報協会  車載テクノロジー  2023.10

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    Author:Myself 

  9. 第3世代が到来 Internet

    日本経済新聞社  日経ビジネス 電子版  2023.10

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    Author:Myself 

  10. 次世代自動車2030年ロードマップとそこに求められる次世代パワー半導体実装・センサ応用技術 Newspaper, magazine

    月刊クリーンテクノロジー  2023.9

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    Author:Myself 

  11. EVパワー半導体、日中韓3車比較 トヨタに残る「HV最適」 Internet

    NIKKEIMobility寄稿  日経BP  2023.9

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    Author:Myself 

  12. DC-DCコンバータへのGaNの適用事例 Newspaper, magazine

    CQ出版  CQ出版  2023.8

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    Author:Myself 

  13. EALの統合モーターコントローラーの解説 Newspaper, magazine

    日経BP  日経BP  2023.7

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    Author:Myself 

  14. 各社インバータの解説 チップワンストップチャンネル Internet

    チップワンストップ  チップワンストップチャンネル  2023.6

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    Author:Myself 

  15. テクノロジー・ロードマップ2024-2033 全産業編 Newspaper, magazine

    日経BP  2023.6

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    Author:Myself 

  16. 「日立アステモ、新CEOに前ホンダ副社長 主導権が移行」以降108件解説 Internet

    日経BP  日経電子版「Think!」  2023.6

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    Author:Myself 

  17. xEV本格普及に向けて Newspaper, magazine

    産業タイムズ社  電子デバイス産業新聞  2023.5

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    Author:Myself 

  18. xEV本格普及に向けて Newspaper, magazine

    産業タイムズ社  電子デバイス新聞  2023.5

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    Author:Myself 

  19. GaNパワー半導体を適用した電気自動車用DC-DCコンバータのノイズ対策技術 Newspaper, magazine

    科学情報出版  月刊EMC  P55~63  2023.5

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    Author:Myself 

  20. 最前線/車載用EMC設計 車載用ノイズ対策技術最前線 Newspaper, magazine

    科学情報出版株式会社  月刊EMC  https://www.it-book.co.jp/EMC/backnumber/418.html  2023.2

  21. 世界の電気自動車(EV)技術最前線と2025年のEV新市場参入のための豊田合成への提言 Promotional material

    豊田合成株式会社  豊田合成技報 Vol.64 2022  特別寄稿  2022.12

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    Author:Myself 

  22. 電動航空機およびハイブリッド航空機におけるシステムシミュレーション技術 Promotional material

    システム制御情報学会  システム制御情報学会論文誌「システム/制御/情報」 第66巻 第12号 解説論文執筆  https://www.iscie.or.jp/pub/journal  2022.12

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    Author:Myself 

  23. 愛情物語 オシロスコープ Newspaper, magazine

    日刊工業新聞社  日刊工業新聞  24面  2022.10

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    Author:Myself 

  24. トランジスタ技術9月号に記事執筆企画対応「新時代!エレキ屋さん的3Dものづくり入門」 Newspaper, magazine

    CQ出版株式会社  トランジスタ技術2022年9月号  https://toragi.cqpub.co.jp/magazine/202209/  2022.9

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    Author:Other 

  25. EV電力変換テーマに講演 テクノフロンティア2022 Newspaper, magazine

    産業タイムス社  電子デバイス産業新聞  2面  2022.8

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    Author:Other 

  26. 中国発「50万円EV」は、世界市場に飛躍できるか:話題の「宏光MINI EV」を分析して見えてきたこと Newspaper, magazine

    WIRED  WIRED  https://wired.jp/article/review-wuling-hongguang-mini-ev/?fbclid=IwAR1YN4ns8jO1e-Xnw7e161ykX-kCueV9_KKCHcsY8Ub20Bl0VL3R737r-1s  2022.7

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    Author:Other 

  27. EV日本初公開 中国・NIO Newspaper, magazine

    日刊工業新聞社  日刊工業新聞  7面  2022.7

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    Author:Other 

  28. NIOの分解セミナー Newspaper, magazine

    日刊工業新聞  日刊工業新聞社  15面  2022.7

  29. 個人でパワエレを楽しめる時代がキタ! Newspaper, magazine

    CQ出版株式会社  トランジスタ技術2022年8月号  https://toragi.cqpub.co.jp/magazine/202208/  2022.7

  30. 「テスラ3」をバラして分かったニッポン製造業の勝ち筋 Newspaper, magazine

    日本物流新聞社  日本物流新聞  23面  2022.6

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    Author:Myself 

  31. SiCパワー半導体実装状況 Promotional material

    JPCA  JPCA NEWS  巻頭ページ  2022.4

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    Author:Myself 

  32. 中国50万円EVのインバーター、超低コスト実現の見事な設計力 Newspaper, magazine

    日経BP  日経XTEC  https://xtech.nikkei.com/atcl/nxt/mag/ne/18/00007/00169/  2022.4

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    Author:Myself 

  33. フォルクスワーゲン「ID.3」徹底分解 Newspaper, magazine

    日経BP  2022.2

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    Author:Myself 

  34. パワー半導体の高性能化と小型化で、EVの航続距離を伸ばすことができる

    読売新聞  2022.2

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    Author:Myself 

  35. パワー半導体SiC/GaNの課題... 高速スイッチングによるサージと 対策回路への研究 Newspaper, magazine

    CQ出版株式会社  トランジスタ技術 2月号  2022.2

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    Author:Myself 

  36. ポルシェのEVの最新インバータ解体ショー Newspaper, magazine

    CQ出版社  トランジスタ技術  P48~52  2022.2

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    Author:Myself 

  37. 次世代EV/HEV用モータの高出力化と関連材料の開発 Newspaper, magazine

    株式会社技術情報協会  2022.1

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    Author:Myself 

  38. 中国の「50万円EV」を分解  機能割り切り格安を実現 Newspaper, magazine

    日本経済新聞  2021.12

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    Author:Myself 

  39. 次世代パワー半導体の開発動向と応用展開EV・HEV用モータと、高出力化に向けた関連材料の開発

    株式会社エヌ・ティー・エス  2021.12

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    Author:Myself 

  40. 次世代自動車2030年ロードマップ Newspaper, magazine

    電波新聞  2021.11

  41. 日本の鉄は赤船に乗るか? ~中国48万円EVの衝撃~ Promotional material

    JRCM NEWS  2021.8

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    Author:Myself 

  42. 航空機産業を支える実力企業 Newspaper, magazine

    日刊工業新聞  2021.5

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    Author:Myself 

  43. MIRAIのみらい TV or radio program

    ZIP-FM  STORY OF MOBILITY  2021.3

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    Author:Myself 

  44. 自動車電動化の潮流 Newspaper, magazine

    日刊工業新聞  2021.2

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    Author:Myself 

  45. 半導体産業EVに不可欠なパワーデバイスの 現状と将来 Newspaper, magazine

    日刊工業新聞  2021.2

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    Author:Myself 

  46. 次世代パワー半導体の開発と空飛ぶクルマへの適用 Newspaper, magazine

    株式会社エヌ・ティー・エス  空飛ぶクルマ 空のモビリティ革命に向けた開発最前線  147頁~155頁  2020.10

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    Author:Myself 

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