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Power Electronics Lab
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The lab works to make power converters smaller and more efficient with next-generation power semiconductors.
AboutAbout the lab
Smaller, more efficient circuits for converting power.
The Yamamoto Lab studies power electronics, the technology of power conversion that changes the form of electricity.
The lab aims to make the power converters and motors used in hybrid vehicles, electric vehicles, power infrastructure, and next-generation aircraft more efficient, smaller, and lighter.
The lab's research integrates the fields of power semiconductors, control, and magnetics.
Using next-generation power semiconductors such as GaN and SiC, the lab builds actual power converters.
Key terms
- Power conversion
- Changing the voltage of direct current, or converting between alternating and direct current. It is an essential technology for cars and mobile devices.
- Power semiconductor
- A semiconductor that acts as a switch, turning large amounts of power on and off
- GaN
- Gallium nitride. A material used in next-generation power semiconductors
ResearchResearch themes
The lab aims to make the power converters and motors used in hybrid vehicles, electric vehicles, next-generation aircraft, and more efficient, smaller, and lighter. It studies power electronics technology that integrates the fields of power semiconductors, control, and magnetics.
*Illustrative imagePower Conversion with GaN Semiconductors
Taking advantage of the properties of GaN (gallium nitride), a next-generation power semiconductor, the lab optimally designs entire power converters, including inductors and capacitors. It builds inverters and other devices that operate at a high frequency of 13.56 MHz.
*Illustrative imagePower Conversion with SiC Semiconductors
The lab studies inverters that use SiC power semiconductors. It approaches the topic from both micro and macro perspectives, from module technology for stable operation to the energy-saving effects in systems such as hybrid vehicles.
*Illustrative imageNext-Generation Magnetic Components
The lab proposes new magnetic core and winding structures for the transformers and inductors used in power conversion circuits. By integrating multiple magnetic cores into one, it reduces overall volume and weight.
*Illustrative imageElectric Aircraft and Flying Cars
The electrification of aircraft is drawing attention because of its lower environmental impact. The lab works on optimizing the converters and inverters that drive high-power motors in electric aircraft, as well as on motor control.
MembersFaculty
The members of the Yamamoto Lab consist of faculty, secretaries, and students in the doctoral, master's, and undergraduate programs.As of 2026
- ProfessorMasayoshi Yamamoto
- Associate ProfessorJun Imaoka
- Project ProfessorKoichi Shigematsu
- Project ProfessorYu Yonezawa
- Project Associate ProfessorArihiro Kamiya
- Project Assistant ProfessorChoi Sihoon
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Circuit Board 2015” Jguarin / CC BY-SA 4.0 (cropped)
- Power Conversion with GaN Semiconductors: “FBH GaN High electron mobility transistor” FBH/P.Immerz / CC BY-SA 4.0 (cropped)
- Power Conversion with SiC Semiconductors: “A semiconductor wafer being removed from processing equipment” YouTube — Purdue Engineering / CC BY 4.0 (cropped)
- Next-Generation Magnetic Components: “ER core assembly exploded” Cyril BUTTAY / CC BY-SA 3.0 (cropped)
- Electric Aircraft and Flying Cars: “Electric aircraft with inflight power production” Lineback CE / CC BY-SA 4.0 (cropped)
- Related lab (パワーエレクトロニクス
（S） 研究グループ): “Electric insulators on top of a transformer (2)” High Contrast / CC BY 3.0 de (cropped) - Related lab (プラズマナノプロセス科学研究グループ): “Plasma Pencil” Entropi5 / CC BY-SA 3.0 (cropped)
- Related lab (エネルギー制御工学研究グループ): “National Bureau of Standards high voltage laboratory” 作者不詳 / Public domain (cropped)
- Related lab (ナノ情報デバイス研究グループ): “Wafer” Santi / CC BY-SA 2.0 (cropped)
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