基于中继线圈切换的三线圈结构WPT系统效率优化研究  

Efficiency optimization of Three-coil Structure WPT Systems Based on Relay Coil Switching

作　　者：陈飞彬 麦瑞坤[1] 李勇[1] 何正友[1] CHEN Feibin;MAI Ruikun;LI Yong;HE Zhengyou(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan Province,China)

机构地区：[1]西南交通大学电气工程学院

出　　处：《中国电机工程学报》2019年第21期6373-6382,共10页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2017YFB1201002);国家杰出青年科学基金(51525702);国家自然科学基金项目(51677155)~~

摘　　要：三线圈结构无线电能传输(wirelesspowertransfer,WPT)系统相比于两线圈结构WPT系统,具有更远的能量传输距离和更高的系统传输效率,但该结构的近距离传输效率有待进一步验证。首先,针对这一问题建立全面、精确的三线圈模型;其次,分析得到三线圈近距离传输效率降低的原因:由于阻抗不匹配的问题,导致线圈损耗增加。最后,给出一种基于中继线圈切换的三线圈结构WPT系统,它将两线圈和三线圈的优势结合在一起,解决三线圈近距离传输效率下降的问题。在理论分析的基础上,通过实验验证基于中继线圈切换的三线圈结构WPT系统效率优化方法的可行性。相比于传统两线圈结构,该系统在远距离的效率提升达23%;相比于普通三线圈结构,该系统在近距离的效率提升达22%。The three-coil wireless power transfer(WPT) system owns an excellent performance on long-distance power transmission and a higher system transmission efficiency, compared to the two-coil WPT system. However, the short-distance transmission efficiency of this structure needs further verification. Firstly, a comprehensive and accurate three-coil model was established. Secondly, the reason why the three-coil short-distance energy transfer efficiency drop was analyzed in detail: the coil loss increases due to the impedance mismatch. Finally, a three-coil WPT system based on relay coil switching was proposed, which combined the advantages of two-coil structure and three-coil structure to increase the overall system efficiency under both short-distance transmission and long-distance transmission. The feasibility of the three-coil structure WPT system based on relay coil switching was verified by experiments. Compared with the ordinary two-coil structure, the system can increase the efficiency by 23% on long-distance. Compared with the ordinary three-coil structure, the system can increase the efficiency by 22% on short-distance.

关 键 词：无线电能传输 三线圈结构 效率优化 中继线圈切换 

分 类 号：TM7[电气工程—电力系统及自动化]