教員紹介

魏 秀欽 教授　
博士（工学）（千葉大学）

プロフィール

魏秀欽

略歴
2012年3月，工学（博士），千葉大学
2012年4月，福岡大学工学部助教
2014年11月，長崎大学大学院工学研究科准教授
2016年4月～　現職
自己紹介

学生と一緒に楽しく，そして厳しく研究に取り組んでおります

趣味・特技
  • ピンポン
  • 映画
受験生の皆さんへ
大学は夢のスタート地点だと思います。大学での四年間は，皆さんの長い人生の中では短い期間ですが，ここで得られる経験はそれ以上の価値があるはずです。皆さんには思い存分大学の生活を楽しんでもらいたい共に，大学生活を通じて，社会に出てからどのような仕事にも対応できる「基礎力」を身に付けてほしいと思っています。

専門

  • パワーエレクトロニクス
  • 電力エネルギー変換
  • 電気機器

キーワード

  • 高周波
  • 高効率
  • スイッチング電源
  • 電力エネルギー
  • 次世代半導体素子

研究内容

持続可能な産業社会を実現するために，電力エネルギーの取り扱いに対し多くの未解決問題への対応できる技術革新が求められています。事実，電力エネルギーの生成，伝送，分配，変換，貯蔵などに関する技術は急速に進化し，電力エネルギーの効率，信頼性，および品質などに対する要求はますます厳しくなっています。本研究室では，スイッチング電源に関する研究を行っています。スイッチング電源は電力エネルギー変換回路の１つであり，半導体素子のオン/オフにより動作します。しかし，回路体積が大きいためその小型化が強く求められています。回路の小型化には高周波化が一つの解となりますが，高周波スイッチング電源であるほどエネルギーロスが増大し，効率が劣化してしまうという問題があります。つまり，スイッチング電源の小型化と高効率化を両立することは大変難しい研究課題となります。

高周波化・高効率を両立できる技術として，E級スイッチング技術と呼ばれているソフトスイッチング技術があり，本研究室では，E級スイッチング技術を適用した様々な高周波・高効率スイッチング電源の設計および開発を行っています。また，近年のGaNなどの次世代半導体素子の登場により，高周波スイッチング電源の設計開発はますます注目されています。本研究室ではこれらの研究開発を通じて，持続可能な産業社会の実現およびエネルギー環境問題の改善に貢献します。

魏秀欽

2016年

学術論文、国際会議Proc.（査読あり）
  1. Takumi Noda, Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya,
    “A design of inductive coupled wireless power transfer system with coupling coil optimizations using PSO,”
    Proceedings of 2016 IEEE International Symposium on Circuits and Systems (ISCAS2016), Montreal, Canada, May 2016. (採録決定)
  2. Xiuqin Wei, Hiroo Sekiya, Tomoharu Nagashima, Marian K. Kazimierczuk, and TadashiSuetsugu
    “Steady-state analysis and design of class-D ZVS inverter at any duty ratio,”
    IEEE Transactions on Power Electronics, vol. 31, no. 1, pp. 394-405, Jan. 2016.

2015年

学術論文、国際会議Proc.（査読あり）
  1. Tomoharu Nagashima, Xiuqin Wei, Elisenda Bou, Eduard Alarcon, Marian K. Kazimierczuk, and Hiroo Sekiya,
    “Analysis and design of loosely inductive coupled wireless power transfer system based on class-E2 DC-DC converter for efficiency enhancement,”
    IEEE Transactions on Circuits and Systems I, vol. 62, no. 11, pp. 2781-2791, Nov. 2015.
  2. Tomoharu Nagashima, Hiroo Sekiya, and Xiuqin Wei,
    “Class-E2 inductive power transfer system with pre- and post-regulators,”
    Proceedings of 4th International Conference on Renewable Energy Research and Applications (ICRERA2015), 5 pages, Palermo, Italy, Nov. 2015.
  3. Koyo Yonekura, Xiuqin Wei, Tomoharu Nagashima, Hiroo Sekiya, and Tadashi Suetsugu,
    “Class-D inverter with MOSFET nonlinear parasitic capacitance,”
    Proceedings of 4th International Conference on Renewable Energy Research and Applications (ICRERA2015), 6 pages, Palermo, Italy, Nov. 2015.
  4. Tadashi Suetsugu, Shotaro Kuga, and Xiuqin Wei,
    “A method for dividing voltage stress of high voltage class E inverter,”
    Proceedings of 37th International Telecommunications Energy Conference (INTELEC2015), pp. 437-440, Osaka, Japan, (Oct. 2015)
  5. Hironori Murakami, Naoyuki Ishibashi, Xiuqin Wei, Akihiko Katsuki, Masahiko Hirokawa, and Shigetaka Maeyama,
    “Characteristics of high frequency gate driver by the use of LC self-excitation oscillator,”
    Proceedings of 37th International Telecommunications Energy Conference (INTELEC2015), pp. 232-236, Osaka, Japan, Oct. 2015.
  6. Hiroo Sekiya, Xiuqin Wei, Tomoharu Nagashima, and Marian K. Kazimierczuk,
    “Steady-state analysis and design of class-DE inverter at any duty ratio,”
    IEEE Transactions on Power Electronics, vol. 30, no. 7, pp. 3685-3694, July 2015.
  7. Tadashi Suetsugu, Xiuqin Wei, Shotaro Kuga,
    “Novel architecture of EER transmitter with class-E amplifier,”
    Proceedings of 9th International Conference on Power Electronics-ECCE Asia (ICPE2015-ECCE Asia), pp. 2085-2090, Seoul, Korea, June 2015.
  8. Tomoharu Nagashima, Xiuqin Wei, Elisenda Bou, Eduard Alarcon, and Hiroo Sekiya,
    “Analytical design for resonant inductive coupling wireless power transfer system with class-E inverter and class-DE rectifier,”
    Proceedings of 2015 IEEE International Symposium on Circuits and Systems (ISCAS2015), pp. 686-689, Lisbon, Portugal, May 2015.
  9. Tadashi Suetsugu, Xiuqin Wei, Shotaro Kuga, Naoki Oyama,
    “Switched capacitor discrete control of class E amplifier to achieve nominal operation,”
    IEEJ Journal of Industry Applications, vol. 4, no. 4, pp. 403-408, Jan. 2015.
学術論文、国際会議Proc.（査読なし）
  1. Xiuqin Wei,
    “Design and analysis of class E inverter with MOSFET nonlinear gate-drain and nonlinear drain-to-source capacitances,”
    Proceedings of 37th International Telecommunications Energy Conference (INTELEC2015), pp. 859-863, Osaka, Japan, Oct. 2015.
その他
  1. 特許：
    発明の名称：EM級増幅器
    出願番号：特願2011-246009
    登録番号：特許第5773364号
    登録日：2015年7月10日

2014年

学術論文、国際会議Proc.（査読あり）
  1. Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya,
    “Analytical design procedure for resonant inductively coupled wireless power transfer system with class-DE inverter and class-E rectifier,”
    Proceedings of 2014 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS2014), pp. 288-291, Okinawa, Japan, Nov. 2014.
  2. Tomoharu Nagashima, Xiuqin Wei, Hisa-Aki Tanaka, and Hiroo Sekiya,
    “Locking range derivations for injection-locked class-E oscillator applying phase reduction theory,”
    IEEE Transactions on Circuits and Systems I, vol. 61, no. 10, pp. 2904-2911, Oct. 2014.
  3. Tadashi Suetsugu, Naoki Oyama, Shotaro Kuga, Makoto Taromaru, and Xiuqin Wei,
    “pEPWM architectures for fast transient response of class E amplifiers in EER system,”
    Proceedings of International Conference on Renewable Energy Research and Applications (ICRERA2014), pp. 354-358, Milwaukee, USA, Oct. 2014.
  4. Tadashi Suetsugu, Naoki Oyama, Shotaro Kuga, Makoto Taromaru, and Xiuqin Wei,
    “Comparison of EPWM architectures for class E amplifiers in EER system,”
    Proceedings of 16th International Power Electronics and Motion Control Conference and Exposition (PEMC2014), pp. 418-423, Antalya, Turkey, Sept. 2014.
  5. Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya,
    “Operation of class-E2 dc-dc converter outside nominal conditions,”
    Proceedings of 2014 International Symposium on Nonlinear Theory and its Applications (NOLTA2014), pp. 478-481, Luzern, Switzerland, Sept. 2014.
  6. Hiroo Sekiya, Kazuhide Inoue, Tomoharu Nagashima, Tadashi Suetsugu, Shotaro Kuga, Xiuqin Wei, Kenichi Shirota, Hironobu Hatamoto, and Satoru Shimizu,
    “A loosely coupled inductive wireless power transfer systems with class-E transmitter and multiple receivers,”
    Proceedings of 2014 IEEE Energy Conversion Congress and Exposition (ECCE2014), pp. 675-680, Pittsburgh, PA, USA, Sept. 2014.
  7. Tadashi Suetsugu, Xiuqin Wei, and Marian K. Kazimierczuk,
    “Analysis of dynamic and transient response of frequency modulated class E amplifier,”
    IEICE Transactions on Communications, vol. E97-B, no. 8, pp. 1630-1637, Aug. 2014.
  8. Tomoharu Nagashima, Kazuhide Inoue, Xiuqin Wei, Elisenda Bou, Eduard Alarcon, Marian K. Kazimierczuk, and Hiroo Sekiya,
    “Analytical design procedure for resonant inductively coupled wireless power transfer with class-E2 dc-dc converter,”
    Proceedings of 2014 IEEE International Symposium on Circuits and Systems (ISCAS2014), pp. 113-116, Melbourne, Australia, June 2014.
  9. Tadashi Suetsugu, Xiuqin Wei, Shotaro Kuga,
    “Extended discrete control of class E amplifier in order to achieve nominal operation,”
    Proceedings of 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 ECCE-ASIA), pp. 3955-3958, Hiroshima, Japan, May 2014.
  10. Xiuqin Wei, Tomoharu Nagashima, Marian K. Kazimierczuk, Hiroo Sekiya, and Tadashi Suetsugu,
    “Analysis and design of class-EM power amplifier,”
    IEEE Transactions on Circuits and Systems I, vol. 61, no. 4, pp. 976-986, Apr. 2014.
  11. Tomoharu Nagashima, Xiuqin Wei, Tadashi Suetsugu, Marian K. Kazimierczuk, and Hiroo Sekiya,
    “Waveform equations, output power, and power conversion efficiency for class-E inverter outside nominal operation,”
    IEEE Transactions on Industrial Electronics, vol. 61, no. 4, pp. 1799-1810, Apr. 2014.
  12. Tadashi Suetsugu, Xiuqin Wei, and Marian K. Kazimierczuk,
    “Analysis of power loss of class E amplifier with nonlinear shunt capacitance,”
    IEEJ Journal of Industry Applications, vol. 3, no. 1, pp. 68-74, Jan. 2014.

2013年

学術論文、国際会議Proc.（査読あり）
  1. Hiroo Sekiya, Xiuqin Wei, and Tomoharu Nagashima,
    “MOSFET parasitic capacitance effects to class-DE power amplifier,”
    Proceedings of 2013 IEEE Electrical Design of Advanced Packaging and System Symposium (EDAPS2013), pp. 245-248, Nara, Japan, Dec. 2013.
  2. Kazuhide Inoue, Tomoharu Nagashima, Xiuqin Wei, Hiroo Sekiya,
    “Design of high-efficiency inductive-coupled wireless power transfer system with class-DE transmitter and class-E rectifier,”
    Proceedings of the 39th Annual Conference of the IEEE Industrial Electronics Society (IECON 2013), pp. 611-616, Vienna, Austria, Nov. 2013.
  3. Zhicai Zhang, Xiuqin Wei, Hiroo Sekiya, Naoki Oyama, Tadashi Suetsugu, and Tomoharu Nagashima,
    “Analysis of class EM amplifier with considering non-zero current fall time of drain current,”
    Proceedings of 2013 1st International Future Energy Electronics Conference (IFEEC2013), pp. 338-343, Tainan, Taiwan, Nov. 2013.
  4. Akito Kiri, Mitsuru Sato, Shotaro Kuga, Xiuqin Wei, and Tadashi Suetsugu,
    “Power dissipation at MOSFET gate port of class E amplifier,”
    Proceedings of 2nd International Conference on Renewable Energy Research and Applications (ICRERA2013), pp. 326-329, Madrid, Spain, Oct. 2013.
  5. Tadashi Suetsugu and Xiuqin Wei,
    “Clamping of switch peak voltage with diode and transformer at output of class E amplifier,”
    International Journal of Renewable Energy Research(IJRER), vol. 2, no. 3, pp. 359-363, Oct. 2013.
  6. Tadashi Suetsugu, Xiuqin Wei, and Marian K. Kazimierczuk,
    “Design equations for off-nominal operation of class E amplifier with nonlinear shunt capacitance at D = 0.5,”
    IEICE Transactions on Communications, vol. E96-B, no. 99, pp. 2198-2205, Sept. 2013.
  7. Tomoharu Nagashima, Kazuhide Inoue, Xiuqin Wei, Elisenda Bou, Eduard Alarcon, and Hiroo Sekiya,
    “Inductively coupled wireless powertransfer with class-E2 DC-DC converter,”
    Proceedings of the 21st European Conference of Circuit Theory and Design (ECCTD2013), pp. 1-4, Dresden, Germany, Sept. 2013.
  8. Hiroo Sekiya, Xiuqin Wei, and Tomoharu Nagashima,
    “High-frequency high-efficiency resonant converter with class-E_M inverter and class-E rectifier,”
    Proceedings of IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS2013), pp. 33-36, Ohio, USA, Aug. 2013.
  9. Xiuqin Wei, Tomoharu Nagashima, Hiroo Sekiya, and Tadashi Suetsugu,
    “Effect of MOSFET Parasitic Capacitances on EER Transmitter with Class-E Amplifier,”
    Proceedings of 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), pp. 913-916, Beijing, China, May 2013.
  10. Yusuke Ishikawa, Ryuta Yamamoto, Hiroyuki Uchiyama, Xiuqin Wei, Hiroo Sekiya, and Tadashi Suetsugu,
    “Consideration of Interference Between Parallel Connected Class D Amplifiers Operated at Different Switching Frequencies,”
    Proceedings of 4th International Conference on Power Engineering, Energy and Electrical Drives (POWERENG2013), Istanbul, Turkey, May 2013.
  11. Tomoharu Nagashima, Xiuqin Wei, Hisa-Aki Tanaka, and Hiroo Sekiya,
    “Numerical derivations of locking ranges for injection-locked class-E oscillator,”
    Proceedings of the 10th IEEE International Conference on Power Electronics and Drive Systems (PEDS2013), pp. 1021-1024, Kitakyushu, Japan, Apr. 2013.
  12. Youhei Noguchi, Xiuqin Wei, Tomoharu Nagashima, Hiroo Sekiya, and Tadashi Suetsugu,
    “Negative-bias driving voltage for class-E GaN HEMT oscillator using a diode,”
    Proceedings of 2013 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'13), pp. 201-204, Hawaii, USA, Mar. 2013.

2012年

学術論文、国際会議Proc.（査読あり）
  1. Tomoharu Nagashima, Xiuqin Wei, Tadashi Suetsugu, and Hiroo Sekiya,
    “Inductively coupled wireless power transfer with class-DE power amplifier,”
    Proceedings of 2012 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS2012), pp. 73-76, Kaohsiung, Taiwan, Dec. 2012.
  2. Ryuta Nakamura, XiuqinWei, Takuji Kousaka, and Hiroo Sekiya,
    “Bifurcation in injection-locked class-EM oscillator,”
    Proceedings of 2012 International Symposium on Nonlinear Theory and its Applications (NOLTA2012), pp. 691-694, Mallorca, Spain, Oct. 2012.
  3. Tomoharu Nagashima, Xiuqin Wei, Takuji Kousaka, and Hiroo Sekiya,
    “Analytical derivation of switching-pattern distribution for class-E amplifier using bifurcation theory,”
    Proceedings of 2012 International Symposium on Nonlinear Theory and its Applications (NOLTA2012), pp. 687-690, Mallorca, Spain, Oct. 2012.
  4. Tadashi Suetsugu, Hiroo Sekiya, and Xiuquin Wei,
    “Influence of nonlinear shunt capacitance in harmonic distortion in output envelope of drain voltage modulated class E amplifier,”
    Proceedings of 2012 International Symposium on Nonlinear Theory and its Applications (NOLTA2012), pp. 614-617, Mallorca, Spain, Oct. 2012.
  5. Ryosuke Miyahara, Xiuqin Wei, Tomoharu Nagashima, Takuji Kousaka, and Hiroo Sekiya,
    “Design of class-EM oscillator with second harmonic injection,”
    IEEE Transactions on Circuits and Systems I, vol. 59, no. 10, pp. 2456-2467, Oct. 2012.
  6. Xiuqin Wei, Shingo Kuroiwa, Tomoharu Nagashima, Marian K. Kazimierczuk, and Hiroo Sekiya,
    “Push-pull class-EM power amplifier for low harmonic-contents and high output-power applications,”
    IEEE Transactions on Circuits and Systems I, vol. 59, no. 9, pp. 2137-2146, Sept. 2012.
  7. Tomoharu Nagashima, Xiuqin Wei, Takuji Kousaka, and Hiroo Sekiya,
    “Bifurcation analysis of the class-E inverter for switching-pattern derivations,”
    IEICE　Communications Express (ComEX), vol. 1, no. 1, pp. 33-39, June 2012.
  8. Taro Kakimoto, Tomoharu Nagashima, Xiuqin Wei, and Hiroo Sekiya,
    “Approximate analysis for class-EM amplifier taking into account harmonic frequency components,”
    Proceedings of 2012 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'12), pp. 154-157, Hawaii, USA, Mar. 2012.
  9. Xiuqin Wei, Tomoharu Nagashima, Tadashi Suetsugu, Shingo Kuroiwa, and Hiroo Sekiya,
    “Analytical expressions for class-EM power amplifier,”
    Proceedings of 2012 RISP International Workshop on Nonlinear Circuits, Communications, and Signal Processing (NCSP'12), pp. 150-153, Hawaii, USA, Mar. 2012.

2011年

学術論文、国際会議Proc.（査読あり）
  1. Xiuqin Wei, Tomoharu Nagashima, Shingo Kuroiwa, and Hiroo Sekiya,
    “Design of symmetric class-EM power amplifier,”
    Proceedings of 37th Annual Conference of the IEEE Industrial Electronics Society (IECON2011), pp. 1235-1240, Melbourne, Australia, Nov. 2011.
  2. Xiuqin Wei, Hiroo Sekiya, Shingo Kuroiwa, Tadashi Suetsugu, and Marian K. Kazimierczuk,
    “Design of class-E amplifier with MOSFET linear gate-to-drain and nonlinear drain-to-source capacitances,”
    IEEE Transactions on Circuits and Systems I, vol. 58, no. 10, pp. 2556-2565, Oct. 2011.
  3. Tomoharu Nagashima, Xiuqin Wei, Hiroo Sekiya, and Marian K. Kazimierczuk,
    “Power conversion efficiency of class-E power amplifier outside nominal operations,”
    Proceedings of 2011 IEEE International Symposium on Circuits and Systems (ISCAS2011), pp. 749-752, Riode Janeiro, Brazil, May 2011.

2010年

学術論文、国際会議Proc.（査読あり）
  1. Yusuke Ishikawa, Ryuta Yamamoto, Hiroyuki Uchiyama, Xiuqin Wei, Hiroo Sekiya, and Tadashi Suetsugu,
    “Inter-connection of parallel connected class D amplifiers operated at different switching frequencies,”
    Proceedings of 2010 International Symposium on Nonlinear Theory and Its Applications (NOLTA2010), pp. 516-519, Krakow, Poland, Sept. 2010.
  2. Xiuqin Wei, Hiroo Sekiya, Shingo Kuroiwa, Tadashi Suetsugu, and Marian K. Kazimierczuk,
    “Effect of MOSFET gate-to-drain parasitic capacitance on class-E power amplifier,”
    Proceedings of 2010 IEEE International Symposium on Circuits and Systems (ISCAS2010), pp. 3200-3203, Paris, France, May 2010.

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