Multi-coil high efficiency wireless power transfer system against misalignment

Chen Xu, Y. Zhuang, Hongjian Han, Chaoyun Song, Yi Huang, Jiafeng Zhou
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引用次数: 12

Abstract

The power transfer efficiency of magnetic-resonance coupled wireless power transfer (WPT) systems is sensitive to the alignment of coils. In this paper, a novel multi-coil WPT system is proposed to enhance power transfer efficiency. It can overcome the misalignment problem and maintain high power transfer efficiency. The proposed coil loop structure can provide a strong magnetic resonance coupling between the Tx and Rx coils. There are four induvial resonators applied in the system and it demonstrates that at least a pair of coupled resonators in several misaligned conditions could realize high power transfer efficiency over a misaligned distance. The experimental results show that the proposed multi-loop WPT system can achieve 90.2% peak efficiency when the coils are well aligned. Mean-while, this WPT system maintains over 70% efficiency over a misalignment distance from 0 to 55 mm, which is about 66% of the length of the Rx board. The proposed WPT system could be used either in implant devices for biomedical healthcare and treatment or for electric vehicles charging systems.
多线圈高效无线电力传输系统
磁共振耦合无线电力传输系统的电力传输效率对线圈的对准非常敏感。为了提高功率传输效率,本文提出了一种新型的多线圈WPT系统。它可以克服不对准问题,保持较高的功率传输效率。所提出的线圈回路结构可以在Tx和Rx线圈之间提供强磁共振耦合。该系统采用了4个独立谐振器,结果表明,在几种不对准条件下,至少有一对耦合谐振器可以在不对准距离内实现较高的功率传输效率。实验结果表明,在线圈排列良好的情况下,多回路WPT系统的峰值效率可达90.2%。同时,该WPT系统在0到55 mm的误差范围内(约为Rx板长度的66%)保持了70%以上的效率。所提出的WPT系统既可以用于生物医学保健和治疗的植入装置,也可以用于电动汽车充电系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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