Papers - IMAOKA Jun

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

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Language：English   Publishing type：Research paper (international conference proceedings)  

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

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Language：English   Publishing type：Research paper (international conference proceedings)  

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

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1541/ieejjournal.145.258

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

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

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

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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

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICSJ62869.2024.10804726

Other Link： https://ieeexplore.ieee.org/document/10804726

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

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICSJ62869.2024.10804738.

Other Link： https://ieeexplore.ieee.org/document/10804738

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

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

DOI： https://doi.org/10.1587/transfun.2024EAP1074

Other Link： https://www.jstage.jst.go.jp/article/transfun/advpub/0/advpub_2024EAP1074/_article/-char/ja

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

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICRERA62673.2024.10815548.

Other Link： https://ieeexplore.ieee.org/document/10815548

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

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICRERA62673.2024.10815499

Other Link： https://ieeexplore.ieee.org/document/10815499

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

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICRERA62673.2024.10815482

Other Link： https://ieeexplore.ieee.org/document/10815482

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

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICRERA62673.2024.10815316

Other Link： https://ieeexplore.ieee.org/document/10815316

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

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ECCE55643.2024.10861836

Other Link： https://ieeexplore.ieee.org/document/10861836

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

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ECCE55643.2024.10860786

Other Link： https://ieeexplore.ieee.org/document/10860786

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

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ECCE55643.2024.10861124

Other Link： https://ieeexplore.ieee.org/document/10861124

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

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/EMCCompo61192.2024.10742027

Other Link： https://ieeexplore.ieee.org/document/10742027

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

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

DOI： https://doi.org/10.1541/ieejias.144.645

Other Link： https://www.jstage.jst.go.jp/article/ieejias/144/9/144_645/_article/-char/ja/

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

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

DOI： 10.1109/TPEL.2024.3445388

Other Link： https://ieeexplore.ieee.org/document/10638834

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

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

DOI： 10.1109/TPEL.2024.3438831

Other Link： https://ieeexplore.ieee.org/document/10623801

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

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

DOI： https://doi.org/10.1587/transfun.2023EAP1081

Other Link： https://www.jstage.jst.go.jp/article/transfun/E107.A/8/E107.A_2023EAP1081/_article/-char/en