期刊
ELECTRONICS
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/electronics11040635
关键词
wireless power transfer; capacitive-wireless power transfer; class-E-2 power convertor; coupling misalignment; multi-resonant coupling
资金
- U.S. Department of Energy, Office of Fusion Energy Sciences [DE-SC0020183]
- U.S. Department of Energy (DOE) [DE-SC0020183] Funding Source: U.S. Department of Energy (DOE)
A novel capacitive wireless power transfer system using 8-plate multi-resonant coupling was proposed to minimize the effects of misalignment and improve efficiency. Hardware results showed that this system achieved 88.5% efficiency in a 20.8W test, which was 18.3% higher than a regular 4-plate coupling, and reduced the output voltage drop by 15% for a 10% misalignment.
Misalignment is a common issue in wireless power transfer systems. It shifts the resonant frequency away from the operating frequency that affects the power flow and efficiency from the charging station to the load. This work proposes a novel capacitive wireless power transfer (CPT) using an 8-plate multi-resonant capacitive coupling to minimize the effect of misalignments. A single-active switch class-E-2 power converter is utilized to achieve multi-resonance through the selection of different resonant inductors. Simulations show a widening of the resonant frequency band which offers better performance than a regular 4-plate capacitive coupling for misalignments. The hardware results of the 8-plate multi-resonant coupling show an efficiency of 88.5% for the 20.8 W test, which is 18.3% higher than that of the regular 4-plate coupling. Because of the wider resonant frequency band {455-485 kHz}, compared with the regular 4-plate coupling, the proposed design minimized the output voltage drop by 15% for a 10% misalignment. Even for large misalignments, the 8-plate performance improved by 40% compared with the 4-plate coupling.
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