The Journal of Engineering | |
A 99%-efficiency GaN converter for 6.78 MHz magnetic resonant wireless power transfer system | |
Yuki Ito1  Yoshiyuki Akuzawa1  Toshihiro Ezoe1  Kiyohide Sakai1  | |
[1] Kamakura Office, Mitsubishi Electric Engineering Co. Ltd, 730 Kamimachiya, Kamakura, Kanagawa 247-0065, Japan | |
关键词: size 150 mm; gateâsource capacitance; efficiency 82.8 percent; size 40 mm; drain efficiency; power 33 W; efficiency 97.7 percent; magnetic resonant coils; power 25 W; negative-bias gate driver circuit; Si; frequency 6.78 MHz; magnetic resonant wireless power transfer system; depletion mode GaN high-electron-mobility transistor; efficiency 98.8 percent; gallium-nitride Class-E converter; GaN; depletion mode GaN HEMT; GaN Class-E converter; Si Schottky barrier diodes; full-bridge rectifier; | |
DOI : 10.1049/joe.2014.0245 | |
学科分类:工程和技术(综合) | |
来源: IET | |
【 摘 要 】
The authors developed a high-efficiency gallium-nitride (GaN) Class-E converter for a 6.78 MHz magnetic resonant wireless power transfer system. A negative-bias gate driver circuit made it possible to use a depletion mode GaN high-electron-mobility transistor (HEMT), and simplified the converter circuit. As the depletion mode GaN HEMT with very small gateâsource capacitance provided almost ideal zero-voltage switching, the authors attained a drain efficiency of 98.8% and a total efficiency of 97.7%, including power consumption of a gate driver circuit, at a power output of 33 W. In addition, the authors demonstrated a 6.78 MHz magnetic resonant wireless power transfer system that consisted of the GaN Class-E converter, a pair of magnetic resonant coils 150 mm in diameter with an air-gap distance of 40 mm, and a full-bridge rectifier using Si Schottky barrier diodes. The system achieved a dcâdc efficiency of 82.8% at a power output of 25 W. The efficiencies of coil coupling and the rectifier were estimated to be â¼ 94 and 90%, respectively.
【 授权许可】
CC BY
【 预 览 】
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RO201902025269749ZK.pdf | 287KB | download |