Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System
Application of Parity-Time Symmetry to Low-Frequency Wireless Power Transfer System
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DOI：
10.1541/ieejjia.21002583
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发表时间：
2021
影响因子：
1.7
通讯作者：
H. Ishida;T. Kyoden;Hiroto Furukawa
中科院分区：
文献类型：
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作者：
H. Ishida;T. Kyoden;Hiroto Furukawa
在这项研究中，奇偶时间对称性（PTS）应用于无线功率传输（WPT）系统在30-40 kHz的低频范围。利用耦合模理论分析了串并联拓扑结构。结果表明，PTS可以保持在一个长的传输距离，即使在低频率，通过减少接收线圈的自感。接收端电磁线圈（尺寸71 × 30 × 7.4 mm，质量45.6 g，自感119 μH）在12-40 mm距离内，发射功率为23±1 W，效率为83±1%，线圈取向范围从±5°增加到±65°。基于D类逆变器的开关放大器在低频时的功率转换效率达到97%。这些结果有望有助于PTS-WPT应用的扩展。
In this study, parity-time symmetry (PTS) was applied to a wireless power transfer (WPT) system in the low-frequency range of 30–40 kHz. 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 × 7.4 mm, mass: 45.6 g, self-inductance: 119 μH) was able to maintain a transmission power of 23±1 W and an efficiency of 83±1% within a distance of 12–40 mm. 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.