基于磁耦合谐振的无线电能传输系统负载特性研究

Research of load characteristics of wireless power transmission system based on magnetic coupling resonance

为研究负载对无线电能传输系统传输性能的影响,建立了基于磁耦合谐振的无线电能传输系统的电路模型,利用电路耦合理论推导出在不同距离上为抑制频率分裂现象所需的最小负载以及当接收功率最大时的最佳匹配负载计算模型,且最佳匹配负载总是大于最小负载。仿真结果表明,对于不同的耦合系数,增大负载可以抑制频率分裂现象的出现;当接收功率达到最大值时,最佳匹配负载会因耦合系数的不同而改变,且总会有一个最佳匹配负载与之对应。这一结论为无线电能传输系统的负载选择提供了理论指导。

In order to study the influence of load on transmission performance of wireless power transmission system, circuit model of wireless power transmission system based on magnetic coupling resonance was established. The analytical expression of the minimum load to avoid frequency splitting and the optimal matching load calculation model with the maximum received power were obtained by using circuit coupling theory. At the same time, the minimum load is always less than the optimal matching load. The simulation results show that increasing the load value can inhibit the frequency splitting phenomenon for different coupling coefficient; When receive power is the maximum, the best matching load values is changed with the difference of coupling coefficient, and there always will be the best matching load. The conclusion can provide theoretical guidance for load selection of the wireless power transmission system.