磁耦合谐振式无线电能传输系统的频率特性

Characteristic of frequency in wireless power transfer system via magnetic resonance coupling

针对磁耦合谐振式无线电能传输技术的传输效率随着发射设备与接收设备距离的变化而波动的问题,采用频率特性的新方法分析无线电能传输系统得到了对实际系统设计具有关键指导作用的结果,其中包括频率分裂特性和最大传输距离。利用频率分裂规律对不同距离的效率进行频率跟踪补偿可以提高系统传能效率。通过设计的相关的实验电路验证了频率分裂特性与系统最大传输距离(临界耦合点)理论分析的正确性,为提高无线电能传输功率和距离提供有效的参考。

Aiming at the efficiency of wireless power transfer via magnetic resonance coupling varies according to the air gap between the transfer device and receiver device, a new analysis on characteristic of frequency was presented, which yielded critical insight into the design of practical systems, including the introduction of frequency splitting that could be used to compensate the efficiency with different distance and the maximum operation distance that could be used to improve power transfer distance. Equivalent circuit model was designed and the experiment results verify the correctness of key theoretical analysis on frequency splitting and the maximum operation distance（ critical coupling point） ; thus it provides an effective reference for improving the power transfer efficiency and operation distance.