磁谐振式无线电源在非对称耦合时的系统性能分析

摘要

This article studies the theory and equiva-lent models of magnetic-resonance wireless power transfer system, as well as the frequency splitting is-sue in the over-coupling state. By analyzing the mutu-al inductance factor of magnetic-resonance systems, transmission efficiency expression in magnetic-reso-nance state of transceivers coil is deduced; Moreover, by analyzing asymmetric couplingstructure in practical mobile terminal applications, the influence on trans-mission efficiency stemming from key factors, such as coil spacing and size, is derived. Based on the analy-sis, the optimal critical conditions can significantly guide wireless power design of mobile terminals.%研究了磁谐振式无线充电系统原理与等效模型，以及在过耦合状态时出现的频率分裂问题。通过对磁谐振系统中互感因数的分析，获得了收发线圈在磁场谐振状态下的传输效率表达式；并且分析了移动终端应用多见的非对称耦合结构，推导出线圈间距、发射线圈尺寸等关键参数对传输效率的影响。分析得出的最优临界条件，可显著优化移动终端的无线电源设计。