一种磁耦合谐振式无线电能传输系统的研究

摘要

在传统的无线电能传输(WPT)系统中,系统发射线圈上的电流随负载变化会引起传输功率和效率的变化.针对该问题,采用集成式LCC补偿拓扑.采用二端口网络分析法对系统进行建模和分析,得出不同负载情况下系统的输出电流和输入电压的增益、输入阻抗实部、系统效率的曲线.为向系统参数的选择提供参考,通过分析负载和耦合系数对谐振元件电压、电流应力的影响,提出了谐振元件参数选取的方法.最后,搭建了集成式LCC补偿拓扑的WPT系统样机,实验结果证明了理论分析的正确性.%In the traditional wireless power transfer(WPT) system,the primary current of transmitted coil is related to load,which will cause instability of transmission power and efficiency.Aimed at this problem,integrated LCC compensation topology is adopt.By applying the two-port network on the system modeling and analysis,it is concluded that a gain between the system's output current and input voltage,system efficiency,the real component of input impedance,all these parameters which change as switching frequency and different load are analyzed.To provide preference for the selection of system parameters,the resonant component parameters optimization design method is proposed by analyzing the impression between the load or coupling coefficient and the voltage or current of the resonant components.In the end,a tentative WPT system based on integrated LCC compensated topology is established,and the results prove the validity of theoretical analysis.