Faculty Profiles - IMAOKA Jun

Papers - IMAOKA Jun

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Low Loop Inductance in Power Semiconductor Module with Direct-Lead Bonding Busbar Invited Reviewed

Jiyoon Choi, Sihoon Choi, Jun Imaoka, Masayoshi Yamamoto

Proc. of 37th International Symposium on Power Semiconductor Devices and ICs 2025.6

A Novel Online Estimation Method for Low Equivalent Series Resistance of Smoothing Capacitors Reviewed

Yusuke Sawada, Kengo Nagai, Sihoon Choi, Yu Yonezawa, Jun Imaoka, Masayoshi Yamamoto, Toshiumi Tatsuki, Masatoshi Ohkura

Proc. of IEEE Energy Conversion Congress & Expo (ECCE) Asia 2025.5

Manufacturing and Reliability of Flip Chip SiC Power Module for Common-Mode Noise Reduction Reviewed International coauthorship

Thiyu Warnakulasooriya, Sihoon Choi, Yu Yonezawa, Jun Imaoka, Masayoshi Yamamoto

Proc. of IEEE Energy Conversion Congress & Expo (ECCE) Asia 2025.5

高周波パワエレ磁気デバイス Invited Reviewed

今岡淳

電気学会誌 Vol. 145 ( 5 ) page： 258 - 261 2025.5

Balanced Technique Using Integrated Winding Coupled Inductor for High-Power Density Two-Phase Interleaved Boost Converter Reviewed

Yuta Imaeda, Jun Imaoka, Masayoshi Yamamoto, Hiroyuki Onishi

Proc. of IEEE Applied Power Electronics Conference and Exposition (APEC) page： 2431 - 2437 2025.3

Bridgeless Power Factor Correction Flyback Rectifier Using a Novel Integrated Transformer Invited Reviewed

H. Hirasawa, S. Choi, Y. Yonezawa, J. Imaoka, M. Yamamoto

Vol. 218 ( 1 ) page： e23485 - e23485 2025.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)

This study proposes a novel integrated transformer structure with simple circuit configuration and miniaturized magnetic components. In a bridgeless flyback rectifier, two flyback converters operate corresponding to the polarity of the AC input, requiring two transformers. This paper proposes a novel winding structure that realizes zero coupling co-efficient between two sets of windings. This enables the integration of two transformers into a single transformer, preventing their flyback operations from interfering with each other. The integrated transformer has approximately 16% lower volume compared to that of conventional transformers. The proposed integrated transformer was built, evaluated, and verified by designing a 75 W-bridgeless flyback rectifier with 100 kHz switching frequency.

DOI： 10.1002/eej.23485

Web of Science

Scopus

Other Link： https://onlinelibrary.wiley.com/toc/15206416/1998/123/1

A Review of BMW iX3 Power Module – Part 2: Stacked-Plate Fin Heatsink Structure Reviewed

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

Proc. of 13th IEEE CPMT Symposium Japan (ICSJ2024) page： 220 - 223 2024.11

A Review of BMW iX3 Power Module – Part 1: Inner Configuration, Die Attachment, Busbar Connection and Encapsulation Reviewed

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

Proc. of 13th IEEE CPMT Symposium Japan（ICSJ 2024） page： 216 - 219 2024.11

Maximum Output Power Design on an 85kHz Class-D Halfbridge ZVS Inverter with Power-MOSFETs Reviewed

Yi Xiong, Senanayake Thilak, Daisuke Arai, Jun Imaoka, Masayoshi Yamamoto

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2024.11

Optimising Electric Vehicle Wireless Charging Systems Using Neural Networks to Enable Free-Position Parking Invited Reviewed International coauthorship

Hannah Merrigan, Wu Yu-Hsin, Antoine Lesage-Landry, Koichi Shigematsu, Masayoshi Yamamoto, Jun Imaoka

Proc. of 13th International Conference on Renewable Energy Research And Applications (ICRERA 2024) page： 1510 - 1514 2024.11

A Novel Estimation Method for Equivalent Series Resistance of Film Capacitors Considering Frequency Characteristics Reviewed

Yusuke Sawada, Sihoon Choi, Yu Yonezawa, Jun Imaoka, Masayoshi Yamamoto, Toshiumi Tatsuki, Masatoshi Ohkura

Proc. of 13th International Conference on Renewable Energy Research And Applications (ICRERA 2024) page： 852 - 856 2024.11

Research on continuous operation of active gate driver combining current source and active gate resistor Reviewed

Kiyotaka Ono, Sihoon Choi, Yu Yonezawa, Jun imaoka, Masayohshi Yamamoto

Proc. of 13th International Conference on Renewable Energy Research And Applications (ICRERA 2024) page： 730 - 735 2024.11

Common Mode Noise Reduction with Balance Technique Considering Soft Saturation Characteristics Reviewed

Yota Omizu, Sihoon Choi, Jun imaoka, Masayoshi Yamamoto

Proc. of 13th International Conference on Renewable Energy Research And Applications (ICRERA 2024) page： 736 - 741 2024.11

Design Method of an Integrated Transformer for a Two-phase Interleaved Flyback PFC Rectifier Reviewed

Haruki Hirasawa, Karl Raymond Roque, Sihoon Choi, Yu Yonezawa, Jun Imaoka and Masayoshi Yamamoto

Proc. of 2024 IEEE Energy Conversion Congress and Exposition (ECCE) page： 6650 - 6656 2024.10

SiC Power Module Design using Flip Chip Configuration to Reduce Common-Mode Noise Reviewed

Thiyu Warnakulasooriya, Sihoon Choi, Yu Yonezawa, Koichi Shigematsu, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2024 IEEE Energy Conversion Congress and Exposition (ECCE) page： 7042 - 7047 2024.10

Active Gate Driver Combining Current Source and Active Gate Resistors to Reduce Turn-on Switching Loss and Surge Voltage Reviewed

Kiyotaka Ono, Sihoon Choi, Yu Yonezawa, Jun Imaoka and Masayoshi Yamamoto

Proc. of 2024 IEEE Energy Conversion Congress and Exposition (ECCE) page： 6846 - 6852 2024.10

Common Mode Noise Reduction Methods Used For High Power density DC/DC Converters Invited Reviewed International coauthorship

Jun Imaoka, Mamoru Sasaki, Yasumichi Omoto, Mostafa Noah, Koichi Shigematsu, Masayoshi Yamamoto

Proc. of 14th International Conference on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo 2024) page： 1 - 6 2024.10

統合トランスを適用したブリッジレスフライバックPFCコンバータの提案と検証 Reviewed

平沢開, Sihoon Choi, 米澤遊, 今岡淳, 山本真義

電気学会論文誌Ｄ Vol. 144 ( 9 ) page： 645 - 653 2024.9

Novel Vertical Shunt Resistor: Integration and Optimization in Power Modules Reviewed

S. Choi, T. Warnakulasooriya, J. Choi, Y. Yonezawa, J. Imaoka, M. Yamamoto

IEEE Transactions on Power Electronics Vol. 40 ( 1 ) page： 46 - 50 2024.8

Improved Packaging of Power Module with Low-Permittivity Material for Low Common-Mode Noise and High Reliability Reviewed International coauthorship

Sihoon Choi, Jiyoon Choi, Thiyu Warnakulasooriya, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

IEEE Transactions on Power Electronics Vol. 9 ( 11 ) page： 14261 - 14270 2024.8

Analytical Model of Maximum Operating Frequency of Class-D ZVS Inverter with Linearized Parasitic Capacitance and any Duty Ratio Reviewed

Yi Xiong, Senanayake Thillak, Yu Yonezawa, Jun Imaoka, Masayoshi Yamamoto

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences Vol. E107.A ( 8 ) page： 1115 - 1126 2024.8

Power Module with Low Common-Mode Noise and High Reliability Reviewed International coauthorship

Sihoon Choi, Jiyoon Choi, Thiyu Warnakulasooriya, Jong-Won Shin, Jun Imaoka, Masayoshi Yamamoto

IEEE Access Vol. 12 page： 90929 - 90939 2024.6

Maximum Output Power Design for an 85kHz Class-D ZVS Inverter with 650V/30A SiC-MOSFETs at Any Duty Ratio and DC Input Voltage Reviewed

Yi Xiong, Senanayake Thilak, Jun Imaoka, Yamamoto Masayoshi

Proc. of 2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia) page： 1808 - 1813 2024.5

Efficient Multiphysics Circuit Simulation for Transformer Optimization Using Hybrid Dowell Artificial Neural Network Reviewed

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

IEEJ Journal of Industry Applications Vol. 13 ( 3 ) page： 327 - 337 2024.5

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

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

Proc. of 2024 IEEE IEEE Applied Power Electronics Conference and Exposition (APEC) page： 3247 - 3254 2024.2

Common-Mode Noise Reduction for Bridgeless Flyback PFC Rectifier with Balance Technique Reviewed

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

Proc. of 2024 IEEE Applied Power Electronics Conference and Exposition (APEC) page： 1478 - 1483 2024.2

SiC Power Module Design with a Low-Permittivity Material to Reduce Common-Mode Noise Reviewed

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

Proc. of 2024 IEEE Applied Power Electronics Conference and Exposition (APEC) 2024.2

Design of Coupled Inductor Using Powder Core with Concentrated Air Gap in Multiphase Operation Reviewed

Sihoon Choi, Jun Imaoka, Masayoshi Yamamoto

IEEE Transaction on Industry Applications Vol. 60 ( 2 ) page： 3449 - 3458 2023.12

Packaging of SiC Power Module with a Low-Permittivity Material to Reduce Capacitive Coupling Reviewed International coauthorship

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

Proc. of 2023 IEEE CPMT Symposium Japan (ICSJ) page： 73 - 76 2023.12

A Review of the Packaging Scheme of a Traction Inverter: Layout, Capacitor, Current Sensing and Power Module Reviewed

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

Proc. of 2023 IEEE CPMT Symposium Japan (ICSJ) page： 77 - 80 2023.12

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

Kazuhito Nakamura, Koichi Shigematsu, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2023 IEEE CPMT Symposium Japan (ICSJ) page： 196 - 199 2023.11

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

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

Proc. of 2023 IEEE Energy Conversion Congress and Exposition (ECCE) page： 6444 - 6449 2023.10

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

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

Common mode conductive noise cancellation formultiphase converter using auxiliary winding Invited Reviewed

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

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

Voltage-Controlled Variable Inductor for Fixed-Frequency Critical Conduction Mode Operation Reviewed International coauthorship

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

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

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

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

Proc. of 2023 11th International Conference on Power Electronics -ECCE Asia page： 697 - 702 2023.5

High Reliable Transformer-less Deadtime Less Inverter for Grid-connected Applications Reviewed

Silumin Senanayake, Thilak Senanayake, Jun lmaoka, Masayoshi Yamamoto

Proc. of 2023 11th International Conference on Power Electronics -ECCE Asia page： 1788 - 1794 2023.5

Experimental Verification of Maximum Operating Frequency for a SiC-MOSFET in Class-D ZVS Inverter Reviewed

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

Proc. of 2023 11th International Conference on Power Electronics -ECCE Asia page： 1780 - 1787 2023.5

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. 12 ( 3 ) page： 289 - 294 2023.5

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

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

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

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

Gate Drive Circuit Suitable for a GaN Gate Injection Transistor Reviewed

Fumiya Hattori, Yuta Yanagisawa, Jun Imaoka, Masayoshi Yamamoto

IEEE Access Vol. 11 page： 43169 - 43182 2023.4

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 Reviewed

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

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

An Implementation of Dowell Model with Neural Network to Foil Winding Transformer Reviewed

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

Proc. of 2023 the Applied Power Electronics Conference (APEC) 2023.3

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, 金山天, 韓榮建, 加藤義尚, 末次正, 服部篤典, 野北寛太, 稲田太朗, 浅井寛美, 小泉雄大

エレクトロニクス実装学術講演大会講演論文集 Vol. 37 ( 0 ) page： 15C4-2 2023.3

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

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

IEEJ Journal of Industry Applications Vol. 12 ( 1 ) page： 86 - 93 2023.1

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

Yi Xiong, Senanayake Thilak, Daisuke Arai, Yu Yonezawa, Jun Imaoka, Masayoshi Yamamoto

Proc. of IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society page： 1 - 6 2022.10

Modeling and Design Method of Coupled Inductor Using Powder Core with Concentrated Air Gap Reviewed

Sihoon Choi, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2022 IEEE Energy Conversion Congress and Exposition (ECCE) page： 1 - 5 2022.10

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

Jun Imaoka, Kazuya Matsuta, Hiroki Ochiai, Koichi Shigematsu, Mostafa Noah, Masayoshi Yamamoto

Proc. of 2022 IEEE Energy Conversion Congress and Exposition (ECCE) (ECCE) page： 1 - 7 2022.10

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

Aoi Oyane, Thilak Senanayake, Mitsuru Masuda, Jun Imaoka, Masayoshi Yamamoto

IEICE Transactions on Electronics Vol. E105-C ( 9 ) page： 407 - 418 2022.9

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

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

IEEJ Journal of Industry Applications Vol. 11 ( 5 ) page： 664 - 673 2022.9

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

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

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

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

<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

CiNii Research

Finite Element Method based Thermal Magnetic Core Characteristics Modeling and Thermal Simulation Invited Reviewed

Hiroki Ochiai, Koichi Shigematsu, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2022 IEEE International Symposium on Industrial Electronics (ISIE) page： 320 - 324 2022.6

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

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

Proc. of 2022 IEEE International Power Electronics Conference (IPEC 2022) page： 746 - 752 2022.5

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

Mamoru Sasaki, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2022 IEEE International Power Electronics Conference (IPEC 2022) page： 753 - 758 2022.5

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

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

Proc. of 2022 IEEE International Power Electronics Conference (IPEC 2022) page： 1964 - 1969 2022.5

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

Sihoon Choi, Ayato Suzuki, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2022 IEEE International Power Electronics Conference (IPEC 2022) page： 2236 - 2241 2022.5

Construction of an Electric Aircraft System Model with Power Device Losses Reviewed

Takamitsu Yamahigashi, Kensuke Shibuya, Koichi Shigematsu, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2022 IEEE International Power Electronics Conference (IPEC 2022) page： 2141 - 2146 2022.5

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

Masayoshi Yamamoto, Shinya Shirai, Senanayake Thilak, Jun Imaoka, Ryosuke Ishido, Yuta Okawauchi, Ken Nakahara

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences Vol. E105-A ( 5 ) page： 834 - 843 2022.5

Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人電子情報通信学会

<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： https://doi.org/10.1587/transfun.2021GCI0001

カーボンニュートラルへ向けたパワーエレクトロニクス技術動向と磁気部品の応用技術ー高電力密度/高効率/モデリングー Invited

今岡淳

日本AEM学会誌 Vol. 30 ( 1 ) page： 15 - 22 2022.4

直流ブラシモータに発生するスパイクサージの分析と等価回路を用いた解析モデルの提案 Reviewed

片桐高大, 小川徹, 山本真義, 今岡淳, 佐々木守, 野田和寛

電気学会論文誌D Vol. 142 ( 3 ) page： 167 - 176 2022.3

Improving DC Superimposition Characteristics of Powder Cores by Applying Coupled Inductors in Multiphase Boost Converter Reviewed

Tatsuya Aoki, Jun Imaoka, Masayoshi Yamamoto, Kosuke Yoshimoto

IET Power Electronics Vol. 15 ( 3 ) page： 237 - 250 2022.2

Frequency Doubler Gate Drive Circuit Suitable for High-Frequency Applications Reviewed

Fumiya Hattori, Yasuhisa Ushida, Kengo Sumiya, Yuta Yanagisawa, Jun Imaoka, Mostafa Noah, Masayoshi Yamamoto

IEEE Journal of Emerging and Selected Topics in Power Electronics Vol. 10 ( 1 ) page： 617 - 631 2022.2

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

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

IEEJ Journal of Industry Applications Vol. 11 ( 1 ) page： 41 - 48 2022.1

EMI Analysis and Suppression Method Using Ferrite Beads Applied to LLC Converter Reviewed

Rino Okochi, Hiroyuki Takatsuji, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2021 IEEE International Future Energy Electronics Conference page： 1 - 6 2021.11

Reversed Configuration Boost Converter to Reduce Effective CM Capacitance Reviewed

Mamoru Sasaki, Jun Imaoka, Masayoshi Yamamoto

Proc. of 2021 IEEE International Future Energy Electronics Conference page： 1 - 6 2021.11

Analysis on Parasitic Capacitance to Prevent False Turn-On in GaN HEMT Reviewed

Toshihiro Iwaki, Takashi Sawada, Jun Imaoka, Masayoshi Yamamoto

Proc. of 13th IEEE Energy Conversion Congress and Exposition (ECCE) page： 5616 - 5621 2021.10

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

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

Proc. of 13th IEEE Energy Conversion Congress and Exposition (ECCE) page： 5334 - 5341 2021.10

Underlying and Application Technologies of Inductors for High-Frequency-Switching Power Converters Invited

Jun Imaoka

The Journal of The Institute of Electrical Engineers of Japan Vol. 141 ( 10 ) page： 624 - 626 2021.10

A Magnetic Design Method for Powder Core Inductor with Concentrated Airgap Considering DC Superposition Characteristics Used for High Current Applications Reviewed International coauthorship

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

Proc. of 23rd European Conference on Power Electronics and Applications (EPE) page： 1 - 10 2021.9

Parallel Operation of Split-Source Inverters for PV Systems: Analysis and Modulation for Circulating Current and EMI Noise Reduction Reviewed International coauthorship

M. S. Hassan, A. Abdelhakim, M. Shoyama, J. Imaoka, G. M. Dousoky

IEEE Transactions on Power Electronics Vol. 36 ( 8 ) page： 9547 - 9564 2021.8

Effects of High-frequency Operation on Magnetic Components in Power Converters Reviewed

Jun Imaoka, Wu Yu-Hsin, Koichi Shigematsu, Tatsuya Aoki, Mostafa Noah, Masayoshi Yamamoto

Proc. of the Energy Conversion Congress and Exposition – Asia, 2021 (ECCE Asia 2021) page： 978 - 984 2021.5

産業機械の電動化に向けたマルチ入力モジュラーDC/DCコンバータの協調制御 Reviewed

朴青云, 垣坂資, 今岡淳, 山本真義,甲野藤正明

電気学会論文誌D Vol. 141 ( 4 ) page： 304 - 312 2021.4

13.56MHz High Power Half-Bridge GaN-HEMT Resonant Inverter Achieving 99% Power Efficiency Reviewed

Aoi Oyane, Thilak Senanayake, Fumiya Hattori, Jun Imaoka, Masayoshi Yamamoto, Mitsuru Masuda

Proc. of 2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES) page： 1 - 4 2020.12

A simple gate driver design for GaN-based switching devices with improved surge voltage and switching loss at 1-MHz operation 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. 60 ( SA ) page： SAAD02-1 - SAAD02-9 2020.10

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

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

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

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

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

Proc. of 2020 AEIT International Annual Conference (AEIT) page： 1 - 6 2020.9

Three-Phase Split-Source Inverter-Fed PV Systems: Analysis and Mitigation of Common-Mode Voltage Reviewed International coauthorship

M. S. Hassan, Ahmed Abdelhakim, Masahito Shoyama, Jun Imaoka, Gamal M. Dousoky

IEEE Transactions on Power Electronics Vol. 35 ( 9 ) page： 9826 - 9840 2020.9

Analysis of Common Mode Noise Reduction Mechanism in A Shielded Inductor Reviewed

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

Proc. of 29th IEEE International Symposium on Industrial Electronics (ISIE2020) page： 624 - 629 2020.6

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

Jun Imaoka, Tatsuya Aoki, Koichi Shigematsu, Masayoshi Yamamoto

Proc. of 29th IEEE International Symposium on Industrial Electronics (ISIE2020) page： 1430 - 1437 2020.6

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

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

Proc. of 29th IEEE International Symposium on Industrial Electronics (ISIE2020) page： 636 - 640 2020.6

Technical Trend of Power Electronics Systems for Automotive Applications Reviewed

Masayoshi Yamamoto, Tasuku Kakisaka, Jun Imaoka

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

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

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

Proc. of The 2020 IEEE Applied Power Electronics Conference and Exposition (APEC) page： 2944 - 2949 2020.3

Effects of Secondary Leakage Inductance on the LLC Resonant Converter Reviewed

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

IEEE Transactions on Power Electronics Vol. 35 ( 1 ) page： 835 - 852 2020.1

Coupled Inductor Optimization of a High Step-up Interleaved Boost Converter Reviewed

Wilmar Martinez, Camilo Cortes, Jun Imaoka

IEEJ Journal of Industry Applications Vol. 8 ( 6 ) page： pp. 984-990 2019.11

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

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

IEEE Transactions on Power Electronics Vol. 34 ( 9 ) page： 9033 - 9051 2019.9

A Method to Suppress the Voltage Imbalance Between Series-Connected MOSFETs in DC-DC Converter by Feedback Control Reviewed

Kakisaka Tasuku, Jun Imaoka, Masayoshi Yamamoto

Proc. of Taiwan and Japan Conference on Circuits and Systems (TJCAS2019) page： IB-03 (1page) 2019.8

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

Tatsuya Aoki, Jun Imaoka, Masayoshi Yamamoto, Kosuke Yoshimoto

in Proc. the 13th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2019) page： pp. 1-8 2019.7

Improved Core Loss Calculation Method Considering the non-uniform Distribution of Magnetic Flux Density in Powder Cores Reviewed

Yuki Ishikura, Jun Imaoka, Mostafa Noah, Masayoshi Yamamoto

IET Power Electronics Vol. 12 ( 6 ) page： 1393-1399 2019.5

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

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

in Proc. 10th International Conference on Power Electronics ECCE Asia (ICPE2019) page： pp. 1-8 2019.5

Study on the Imbalanced Voltage of Series-Connected Active Power Semiconductor Devices in Power Conversion Systems Reviewed

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

in Proc. IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA-Asia 2019) page： pp. 1-5 2019.5

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

Yiki Ishikura, Jun Imaoka, Mostafa Noah, Masayoshi Yamamoto

in Proc. the 3rd IEEE ICDCM 2019 International Conference on DC Microgrids page： pp. 1-5 2019.5

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

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

in Proc. the 3rd IEEE ICDCM 2019 International Conference on DC Microgrids page： pp. 1-5 2019.5

Common Mode Conductive Noise Cancellation for Multiphase Converter Using Auxiliary Winding Reviewed

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

in Proc. the 3rd IEEE ICDCM 2019 International Conference on DC Microgrids page： pp. 1-5 2019.5

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

Yuki Ishikura, Jun Imaoka, Mostafa Noah, Masayoshi Yamamoto

IEEJ Journal of Industry Applications Vol. 8 ( 3 ) page： 386-393 2019.5

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

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

Proc. Annual IEEE Applied Power Electronics Conference & Exposition (APEC 2019) page： pp. 780-786 2019.3

Effects of Secondary Leakage Inductance on the LLC Resonant Converter-Part II: Frequency Control Bandwidth with respect to Load Variation

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

Proc. Annual IEEE Applied Power Electronics Conference & Exposition (APEC 2019) page： pp.1408-1414 2019.3

EMI Prediction and Reduction of Zero-crossing Noise in Totem-pole Bridgeless PFC Converter Reviewed

Baihua Zhang, Qiang Lin, Jun Imaoka, Masahito Shoyama, Satoshi Tomioka, Eiji Takegami

Journal of Power Electronics Vol. 19 ( 1 ) page： pp. 278-287 2019.1

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

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

Proc. of IEEE International Power Electronics and Application Conference and Exposition (PEAC) page： pp. 1-5 2018.11

ターンオフ遅延時間を考慮したピーク電流モード制御 DC-DC コンバータの限界動作周波数 Reviewed

藤原和也, 右手凌, 今岡淳, 庄山正仁

電子情報通信学会論文誌 Vol. J101–B ( 11 ) page： 950–957 2018.11

Fundamental Experiment of 3-phase Electric Resonant Coupling Wireless Power Transfer Reviewed

Fumiya Hattori, Jun Imaoka, Masayoshi Yamamoto, Mitsuru Masuda

Proc. of 7th International Conference on Renewable Energy Research and Applications (ICRERA) page： pp. 1417-1422 2018.10

Current-Mode Digital Control Method for High Frequency DC-DC Converter with Reduced Number of Sampling in One Switching Cycle Reviewed

Atsushi Mishima, Reo Takiguchi, Jun Imaoka, Masahito Shoyama, Akihiro Yamaguchi, Tomonori Kimura

Proc. of IEEE Energy Conversion Congress & Exposition (ECCE 2018) page： pp.1423-1427 2018.9

Effect of Inductor Parasitic Resistances on the Voltage-Gain of High Step-Up DC-DC Converters for Electric Vehicle Applications Reviewed

Wilmar Martinez, Camilo Cortes, Jun Imaoka, Masayoshi Yamamoto

IET Power Electronics Vol. 11 ( 10 ) page： 1628–1639 2018.8

Magnetic Design and Experimental Evaluation of a Commercially available Single Integrated Transformer in Three-phase LLC converter Reviewed

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

IEEE Transactions on Industry Applications Vol. 54 ( 6 ) page： 6190 - 6204 2018.6

Review of Current Balance Mechanism in Multiphase LLC Resonant Converters Reviewed

Mostafa Noah Power Electronics Laboratory, Nagoya University, Nagoya, Aichi, Japan, Jun Imaoka, Yuki Ishikura, Kazuhiro Umetani, Masayoshi Yamamoto

Proc. of 2018 IEEE 27th International Symposium on Industrial Electronics (ISIE) page： pp. 1031-1036 2018.6

Limit Operating Frequency of Peak Current-Mode Control DC-DC Converter Considering Turn-Off Delay Time Reviewed

Ryo Ute, Kazuya Fujiwara, Jun Imaoka, Masahito Shoyama

Proc. the 2018 International power Electronics conference-ECCE ASIA- (IPEC-Niigata 2018) page： 3773-3779 2018.5

A Leakage Flux Cancellation Technique for Series- Parallel Combined Resonant Circuits with Asymmetric Rotary Transformers Used for Ultrasonic Spindle Drive Reviewed

Jun Imaoka, Masahito Shoyama

Proc. the 2018 International power Electronics conference-ECCE ASIA- (IPEC-Niigata 2018) page： 1554-1561 2018.5

A Magnetic Design Method Considering DC-Biased Magnetization for Integrated Magnetic Components Used in Multiphase Boost Converters

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

IEEE Transactions on Power Electronics Vol. 33 ( 4 ) page： 3346 - 3362 2018.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Institute of Electrical and Electronics Engineers Inc.

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

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Lagrangian dynamics model and practical implementation of an integrated transformer in multi-phase LLC resonant converter

Mostafa Noah, Kazuhiro Umetani, Jun Imaoka, Masayoshi Yamamoto

IET Power Electronics Vol. 11 ( 2 ) page： 339 - 347 2018.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Institution of Engineering and Technology

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 single-phase topology because it has the minimal number of magnetic components. The purpose of this study is to reduce the number of the magnetic components of the three-phase topology, by integrating the three-discrete transformers into a single magnetic core, based on a theoretical framework. 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 Lagrangian model reveals that in a symmetrical design, there is no interphase coupling, and as a result the magnetic components can be downsized owing to the ac flux cancellation. Along with the theoretical discussion, the practical merits of implementing the integrated transformer is reported. Furthermore, the experimental tests are conducted utilizing a 500 W-390 V/12 V-200 kHz prototype.

DOI： 10.1049/iet-pel.2017.0485

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Winding Orientation Method to Minimise the Secondary Leakage of a Gapped Transformer Utilised in LLC Resonant Converter Reviewed

Mostafa Noah, Kazuhiro Umetani, Masayoshi Yamamoto, Jun Imaoka

Electronics Letters Vol. 53 ( 3 ) page： 157-159 2018.2

A Current Sharing Method Utilizing Single Balancing Transformer for a Multiphase LLC Resonant Converter with Integrated Magnetics Reviewed

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

IEEE Journal of Emerging and Selected Topics in Power Electronics Vol. 6 ( 2 ) page： 977-992 2018

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

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

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

Allowable Power Analysis and Comparison for High Power Density DC-DC Converters with Integrated Magnetic Components Reviewed

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

IEEJ Journal of Industry Applications Vol. 6 ( 6 ) page： 463-472 2017.11

Derivation of Transfer Function of LLC Current Resonant Converter Using Numerical Calculation Reviewed

Masahito Shoyama, Takuma Sagara, Yusuke Yamashita, Jun Imaoka, Yu Yonezawa, Yoshiyasu Nakashima

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 3056-3062 2017.10

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

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

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 3781-3787 2017.10

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

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

Proc. International Communications Energy Conference (INTELEC) page： 526-529 2017.10

Conducted Noise Prediction for Zero-crossing Issue in Totem-pole Bridgeless PFC Converter Reviewed

Baihua Zhang, Qiang Lin, Jun Imaoka, Masahito Shoyama, Satoshi Tomioka, Eiji Takegami

Proc. International Communications Energy Conference (INTELEC) page： 396-401 2017.10

Magnetic Structure of Close-Coupled Inductors to Improve the Thermal Handling Capability in Interleaved DC-DC Converter Reviewed

Thai Hoang Chuong, Shota Kimura, Daigoro Ebisumoto, Mostafa Noah, Masataka Ishihara, Masayoshi Yamamoto, Jun Imaoka, Wilmar Martinez

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 205-210 2017.10

A High-Reliable Magnetic Design Method for Three-Phase Coupled Inductor Used in Interleaved Multi-Phase Boost Converter Reviewed

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

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 873-880 2017.10

An Investigation into A Slight-Variation of The Transformer Effective Permeability In LLC Resonant Converter Reviewed

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

Proc. IEEE 17th Conference on Power Electronics and Applications (EPE'17-ECCE Europe) page： P.1-P.7 2017.9

Total Volume Evaluation of High Power Density Non-Isolated DC-DC Converters with Integrated Magnetics for Electric Vehicle Reviewed

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

IET Power Electronics Vol. 10 ( 14 ) page： 2010–2020 2017.7

Current Ripple Modeling of an Interleaved High Step-Up Converter with Coupled Inductor Reviewed

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

Proc. IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017-ECCE Asia) page： 1084-1089 2017.6

Magnetic Design and Experimental Evaluation of Integrated Magnetic Components used in Interleaved Multi-phase DC/DC Converter with Phase Drive Control Reviewed

Jun Imaoka, Kenkichiro Okamoto, Masahito Shoyama, Daigoro Ebisumoto, Shota Kimura, Mostafa Noah, Masayoshi Yamamoto

Proc. IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017-ECCE Asia) page： 2192-2197 2017.6

A Novel Isolated DC-DC Converter with Integrated Magnetic Components for EV and HEV Applications Reviewed

Shota Kimura, Thai Hoang Chuong, Daigoro Ebisumoto, Taich Kawakami, Masayoshi Yamamoto, Jun Imaoka

Proc. IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017-ECCE Asia) page： 1351-1356 2017.6

Study on Zero-Crossing Conducted Noise Issue of Totem-Pole Bridgeless PFC Converter Reviewed

Baihua Zhang, Jun Imaoka, Masahito Shoyama, Satoshi Tomioka, Eiji Takegami

Proc. IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017-ECCE Asia) page： 2233-2237 2017.6

Design of Series-Parallel Combined Resonant Circuit with Rotary Transformer Used for Ultrasonic Spindle Drive Reviewed

Jun Imaoka, Myoungsik Nam, Masahito Shoyama, Hideaki Fujita

Proc. IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017-ECCE Asia) page： 2244-2249 2017.6

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

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

IEEJ JOURNAL OF INDUSTRY APPLICATIONS Vol. 6 ( 6 ) page： 463 - 472 2017

Analysis and Design Method of ZCS DC-DC Converter in Consideration of the Parasitic Capacitance of Switch and Its Effect on Loss Reduction Reviewed

Takahiro Ota, Jun Imaoka, Masahito Shoyama, Hiroyuki Onishi, Shingo Nagaoka, Sadaharu Morishita

Proc. IEEE 2nd Southern Power Electronics Conference (SPEC) page： 1-6 2016.12

An Investigation of Size-Reduction Effects in High Power Density Boost Converters with a Magnetic Coupling Reviewed

Shogo Aoto, Shota Kimura, Jun Imaoka, Masayoshi Yamamoto

Electrical Engineering in Japan Vol. 197 ( 1 ) page： 46-54 2016.10

A Novel Design Method of Integrated Magnetic Components Used in Two-phase Interleaved Converter with Phase Drive Control Reviewed

Jun Imaoka, Kenkichiro Okamoto, Daigoro Ebisumoto, Shota Kimura, Masayoshi Yamamoto, Masahito Shoyama

Proc. The 3rd Symposium on Semiconductor Power Conversion (S2PC) page： 52-53 2016.10

Reverse-Recovery Current Reduction in a ZCS Boost Converter with Saturable Inductors using Nanocrystalline Core Materials Reviewed

Wilmar Martinez, Mostafa Noah, Masayoshi Yamamoto, Jun Imaoka

Proc. IEEE 18th Conference on Power Electronics and Applications (EPE'16-ECCE Europe) page： 1-9 2016.9

Design of a Four-Phase Interleaved Boost Circuit with Closed-Closed Inductors Reviewed

Daigoro Ebisumoto, Masataka Ishihara, Shota Kimura, Wilmar Martinez, Noah Mostafa, Masayoshi Yamamoto, Jun Imaoka

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 1-6 2016.9

Three-phase LLC Resonant Converter with Integrated Magnetics Reviewed

Wilmar Martinez, Mostafa Noah, Shun Endo, Kimihiro Nanamori, Shota Kimura, Yuki Itoh, Masayoshi Yamamoto, Jun Imaoka, Kazuhiro Umetani

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 1-8 2016.9

Downsizing Effects of Integrated Magnetic Components in High Power Density DC-DC Converters for EV and HEV Applications Reviewed

Shota Kimura, Jun Imaoka, Wilmar Martinez, Shogo Aoto, Masayoshi Yamamoto

IEEE Transaction on Industry Applications Vol. 52 ( 4 ) page： 3294-3305 2016.7

Efficiency Optimization of a Two-Phase Interleaved Boost DC-DC Converter for Electric Vehicle Applications Reviewed

Wilmar Martinez, Masayoshi Yamamoto, Jun Imaoka, Freddy Velandia, Camilo A Cortes

Proc. International Power Electronics and Motion Control Conference (IPEMC 2016-ECCE Asia) page： 2474-2480 2016.5

Analysis and Reduction Method of Conducted Noise in GaN HEMTs based Totem-pole Bridgeless PFC Converter Reviewed

Baihua Zhang, Qiang Lin, Yushi Shimada, Jun Imaoka, Masahito Shoyama, Satoshi Tomioka

Proc. International Power Electronics and Motion Control Conference (IPEMC 2016-ECCE Asia) page： 274-278 2016.5

A Novel Secondary PWM-Controlled Interleaved LLC Resonant Converter for Load Current Sharing Reviewed

Mitsuru Sato, Reo Takiguchi, Jun Imaoka, Masahito Shoyama

Proc. International Power Electronics and Motion Control Conference (IPEMC 2016-ECCE Asia) page： 2276-2280 2016.5

Coupling Coefficient Improvement and Electromagnetic Induced Noise Reduction using Short-Circuited Winding for a Loosely Coupled Inductor Reviewed

Vol. 5 ( 2 ) page： 174-175 2016.3

Magnetic Analysis, Design and Experimental Evaluations for Integrated Winding Coupled Inductor in Interleaved Converters Invited Reviewed

Jun Imaoka, Kazuhiro Umetani, Shota Kimura, Wilmar Martinez, Masayoshi Yamamoto, Seikoh Arimura, Tetsuo Hirano

IEEJ Journal of Industry Applications Vol. 5 ( 3 ) page： 276-288 2016.3

A Novel Three-phase LLC Resonant Converter with Integrated Magnetics for Lower Turn-off Losses and Higher Power Density Reviewed

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

Proc. IEEE Applied Power Electronics Conference & Expo (APEC) page： 322-329 2016.3

密結合インダクタ方式昇圧型PFCコンバータにおける磁束解析 Reviewed

伊藤勇輝, 今岡淳, 山本真義

電気学会論文誌D Vol. 136 ( 1 ) page： 88-89 2016.1

High Step-Up Interleaved Converter for Renewable Energy and Automotive Applications Reviewed

Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto, Kazuhiro Umetani

Proc. International Conference on Renewable Energy Research and Applications (ICRERA) page： 809-814 2015.11

A Novel High Step-Down Interleaved Converter with Coupled Inductor Reviewed

Wilmar Martinez, Jun Imaoka, Yuki Itoh, Masayoshi Yamamoto, Kazuhiro Umetani

Proc. IEEE International Telecommunications Energy Conference (INTELEC) page： 1-6 2015.10

Recovery-Less Boost Converter with Saturable Inductor for Electric Vehicle Applications Reviewed

Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto

IEEJ Journal of Industry Applications Vol. 135 ( 9 ) page： 914-921 2015.9

Analysis of Output Capacitor Voltage Ripple of the Three-Phase Transformer-Linked Boost Converter Reviewed

Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto

Proc. 17th European Conference on Power Electronics and Applications (EPE'15-ECCE Europe) page： 1-9 2015.9

Interleaved Active Clump Forward Converter with Novel Integrated Magnetic Components for EV and HEV Applications Reviewed

Shota Kimura, Shogo Aoto, Masataka Ishihara, Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 6029-6036 2015.9

Design Method Considering Magnetic Saturation Issue of Coupled Inductor in Interleaved CCM Boost PFC Converter Reviewed

Yuki Itoh, Fumiya Hattori, Shota Kimura, Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 2616-2621 2015.9

磁気結合を利用した高電力密度昇圧コンバータにおける小型化性能の検討 Reviewed

青砥匠吾, 木村翔太, 今岡淳, 山本真義

電気学会論文誌C Vol. 135 ( 7 ) page： 776-784 2015.7

Analysis of Coupled-Inductor Configuration for an Interleaved High Step-Up Converter Reviewed

Wilmar Martinez, Jun Imaoka, Yuki Itoh, Masayoshi Yamamoto, Kazuhiro Umetani

Proc. IEEE International Conference on Power Electronics-ICPE 2015-ECCE Asia page： 2241-2248 2015.6

ZCS Interleaved Boost Converter with Saturable Inductors for Reverse-Recovery Reduction Reviewed

Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE International Conference on Power Electronics and Drive Systems (PEDS) page： 855-861 2015.6

Volume Comparison of DC-DC Converters for Electric Vehicles Reviewed

Wilmar Martinez, Jun Imaoka, Shota Kimura, Masayoshi Yamamoto, Camilo A Cortés

Proc. IEEE Workshop on Power Electronics and Power Quality Applications-PEPQA page： 1-6 2015.6

高電力密度昇圧コンバータにおける最大許容電力と小型化性能 Reviewed

木村翔太, 今岡淳, 山本真義

パワーエレクトロニクス学会誌 Vol. 40 page： 84-92 2015.4

Parasitic Resistance Analysis in a Novel High Step-Up Interleaved Converter for Hybrid Electric Vehicles Reviewed

Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto, Kazuhiro Umetani

JIPE-Power Electronics Journal Vol. 40 page： 93-104 2015.4

Feasible Evaluations of Coupled Multilayer Chip Inductor for POL Converters Reviewed

Jun Imaoka, Shota Kimura, Yuki Itoh, Wilmar Martinez, Masayoshi Yamamoto, Michiaki Suzuki, Kenji Kawano

IEEJ Journal of Industry Applications Vol. 4 ( 3 ) page： 126-135 2015.3

High Power Density Three-phase Interleaved Boost Converter with a Novel Coupled Inductor Invited Reviewed

Jun Imaoka, Masahoshi Yamamoto, Takahiro Kawashima

IEEJ Journal of Industry Applications Vol. 4 ( 1 ) page： 20-30 2015.1

A Novel Integrated Magnetic Core Structure Suitable for Transformer-linked Interleaved Boost chopper Circuit Reviewed

IEEJ Journal of Industry applications Vol. 3 ( 5 ) page： 395-404 2014.9

Allowable Power Analysis for High Power Density DC-DC Converters using Integrated Magnetic Components Reviewed

Shota Kimura, Shogo Aoto, Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 5221-5228 2014.9

Inductor Loss Analysis of Various Materials in Interleaved Boost Converters Reviewed

Yuki Itoh, Shota Kimura, Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 980-987 2014.9

Downsizing Effects of Integrated Magnetic Components in High Power Density DC-DC Converters for EV and HEV Reviewed

Shota Kimura, Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 5761-5768 2014.9

Evaluation of the Lagrangian Method for Deriving Equivalent Circuits of Integrated Magnetic Components: A Case Study Using the Integrated Winding Coupled Inductor Reviewed

Kazuhiro Umetani, Jun Imaoka, Masayoshi Yamamoto, Seikoh Arimura, Tetsuo Hirano

Vol. 51 ( 1 ) page： 547-555 2014.6

Feasible Evaluations of Coupled Multilayer Chip Inductor for POL Converter Invited Reviewed

Jun Imaoka, Shota Kimura, Yuki Itoh, Masayoshi Yamamoto, Michiaki Suzuki, Kenji Kawano

Proc. the 2014 International power Electronics conference-ECCE ASIA- (IPEC-Hiroshima 2014) page： 883-890 2014.5

Inductor Loss Calculation of Coupled Inductors for High Power Density Boost Converter Reviewed

Yuki Itoh, Shota Kimura, Jun Imaoka, Masayoshi Yamamoto

Proc. the 2014 International power Electronics conference-ECCE ASIA- (IPEC-Hiroshima 2014) page： 2497-2502 2014.5

Efforts for Power Electronics Education in A Start-Up Company Invited Reviewed

Fumiya Hattori, Jun Imaoka, Manabu Ishitobi, Sinichiro Nagai, Masayoshi Yamamoto

Proc. the 2014 International power Electronics conference-ECCE ASIA- (IPEC-Hiroshima 2014) page： 811-816 2014.5

相互結合インダクタを用いた車載用昇圧チョッパ回路の特性解析と設計 Reviewed

今岡淳, 山本真義, 川島崇宏

パワーエレクトロニクス学会誌 Vol. 51 page： 55-64 2014.4

High Power Density DC- DC Converter for Home Energy Management Systems Invited Reviewed

Wilmar Martinez, Shota Kimura, Jun Imaoka, Masayoshi Yamamoto, Kazuhiro Umetani, Seikoh Arimura, Testuo Hirano

Proc. International Green Building and Smart Grid Conference (IGBSG) page： 1-6 2014.4

Basic Investigation on Core Loss Calculation Method under Square Wave Voltage Magnetizing Condition Reviewed

Shota Kimura, Jun Imaoka, Masayoshi Yamamoto

Proc. 2nd International Conference on Electric Power Equipment-Switching Technology (ICEPE-ST) page： 1-4 2013.10

Analysis of Output Capacitor Voltage Ripple in Multi-Phase Transformer-Linked Boost Chopper Circuit Reviewed

Jun Imaoka, Masayoshi Yamamoto, Yuta Nakamura, Takahiro Kawashima

IEEJ Journal of Industry Applications Vol. 2 ( 5 ) page： 252-260 2013.9

Evaluation of the Lagrangian Method for Deriving Equivalent Circuits of Integrated Magnetic Components: A Case Study Using the Integrated Winding Coupled Inductor Reviewed

Kazuhiro Umetani, Seikoh Arimura, Tetsuo Hirano, Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 495-502 2013.9

Characteristics Analysis and Performance Evaluation for Interleaved Boost Converter with Integrated Winding Coupled Inductor Reviewed

Jun Imaoka, Masayoshi Yamamoto, Kazuhiro Umetani, Seikoh Arimura, Tetsuo Hirano

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 3711-3718 2013.9

Potential Power Analysis and Evaluation for Interleaved Boost Converter with Close-Coupled Inductor Reviewed

Shota Kimura, Jun Imaoka, Masayoshi Yamamoto

Proc. the 10th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2013) page： 26-31 2013.4

Verification of Novel Recovery-Less Boost Converter with Saturable Inductor Reviewed

Kimihiro Nanamori, Jun Imaoka, Kenta Kono, Hideharu Tsukamoto, Masayoshi Yamamoto

Proc. International Conference on Renewable Energy Research and Applications (ICRERA) page： 1-3 2013.3

A Novel Integrated Magnetic Structure suitable for Transformer-Linked Interleaved Boost chopper circuit Reviewed

Jun Imaoka, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 3279-3284 2012.9

Optimal Design Method for Interleaved Single-phase PFC Converter with Coupled Inductor

Jun Imaoka, Yuki Ishikura, Takahiro Kawashima, Masayoshi Yamamoto

Proc. IEEE Energy Conversion Congress & Expo (ECCE) page： 1807-1812 2011.9

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