非对称耦合线圈使得谐振式无线电能传输系统设计更为复杂,尤其是由于非对称结构带来的参数变化对无线电能传输功率的频率分裂规律的影响存在不确定性,此问题已成为制约该技术进一步发展的瓶颈.针对上述问题建立非对称无线电能传输系统的传输模型,计算得到非对称系统接收功率与传输效率的表达式,同时通过理论分析探讨耦合线圈的内阻和品质因数对频率分裂的影响规律,最后搭建相应的实验系统,对理论分析的正确性进行实验验证.实验结果与理论分析具有较好的一致性,证明了所提方法与结论的正确性,为进一步研究基于非对称耦合线圈的谐振式无线电能传输系统的设计与优化提供了有益的参考.%Design of asymmetric coupling coils via coupled magnetic resonances is complicated in wireless power transfer (WPT), especially considering the uncertain effects of frequency split caused by the changes of asymmetric structure parameters. This issue constrains the development of the WPT technology. In this paper, the equivalent circuit model of asymmetric WPT system is established. Then the power and efficiency expressions of asymmetric coupling system are presented. Meanwhile, the influence of internal resistance and quality factor on frequency splitting is summarized. Finally, the experimental system is built to verify the theoretical analysis. The results not only prove the correctness of the proposed method, but also provide a beneficial reference for optimal control of WPT system with asymmetric coupled coil.
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