Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System
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- Ishida Hiroki
- Department of Applied Physics, Okayama University of Science
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- Kyoden Tomoaki
- National Institute of Technology, Toyama College
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- Furukawa Hiroto
- National Institute of Technology, Toyama College
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抄録
<p>In this study, parity-time symmetry (PTS) was applied to a wireless power transfer (WPT) system in the low-frequency range of 30-40kHz. A series-parallel topology was analyzed using the coupled mode theory. It was demonstrated that PTS can be preserved over a long transmission distance even at low frequencies by reducing the self-inductance of the receiver coil. The receiver solenoid coil (dimensions: 71 × 30 × 7.4mm, mass: 45.6g, self-inductance: 119µH) was able to maintain a transmission power of 23±1W and an efficiency of 83±1% within a distance of 12-40mm. In addition, the suitable coil orientation range was significantly increased from ±5° to ±65°. The power conversion efficiency of a switching-mode amplifier based on a class-D inverter reached 97% at low frequency. These results are expected to contribute to the expansion of PTS-WPT applications.</p>
収録刊行物
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- IEEJ Journal of Industry Applications
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IEEJ Journal of Industry Applications 11 (1), 59-68, 2022-01-01
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