ZVS E类逆变器的磁谐振无线输电系统参数分析和设计

E类逆变器用作磁耦合谐振式无线输电MCR-WPT系统的激励源时,其等效负载由线圈参数和系统负载决定,由此导致E类逆变器的优化设计较为困难。为此,研究了两螺线管线圈间的互感算法,分析了互感随线圈间距变化的特性,并探讨了MCR-WPT系统两螺线管线圈的传输效率、输出功率及E类逆变器的等效负载与线圈间距的解析关系,给出E类逆变器实现零电压开关ZVS(zero voltage switch)的参数设计方法,仿真验证了互感算法和系统参数设计方法的精确性。实验结果表明,当线圈间距为26 cm时可实现ZVS,且系统效率达到86.3%,验证了理论和仿真分析的有效性和准确性。

Parameter Analysis and Design of MCR-WPT System Based on ZVS Class E Inverter

When class E inverter is used as an excitation source in magnetically coupled resonant wireless power transmission system(MCR-WPT), the equivalent load is directly related to the mutual inductance between the coils and the load of the system. It leads to the optimization design of the E class inverter more difficult. So the algorithm of mutual inductance between two helix coils and the trend of mutual inductance with the change of the distance between two coils was analyzed in this paper. This paper investigates transfer efficiency and output power of wireless power transmission(WPT) system. And the analytical relationship between equivalent load of class E inverter and transfer distance is also included. The designing method of parameters of MCR-WPT based on E class inverter with ZVS is given. Experiment result shows that when the distance between the coils is 26 cm, ZVS of the E class inverter is realized, and the system efficiency reaches 86.3%. The validity and accuracy of the theoretical and simulation analysis are verified by experi-ments.