Research on frequency stability of magnetic coupling wireless power transfer system
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摘要: 针对磁耦合无线电能传输系统自然振荡频率易受电路参数影响而出现频率分叉现象的问题，利用磁耦合无线电能传输系统等效电路模型，推导出使系统保持频率稳定性的负载电阻及传输距离范围，进一步得出了系统频率稳定性不受传输距离影响的负载电阻范围，在该范围内系统始终保持频率恒定，自然振荡频率不受传输距离影响；通过仿真和实验对理论分析进行了验证。结果表明：负载电阻及传输距离的增大均会在一定程度上降低系统输出功率及传输效率，因此在使系统保持频率稳定性的前提下，应考虑输出功率及传输效率的要求，选择合适的负载电阻和传输距离，防止系统输出功率及传输效率过低。Abstract: The natural oscillation frequency of the magnetic coupling wireless power transfer system is easily affected by circuit parameters and frequency bifurcation phenomenon often occurs. In order to solve the above problems, the equivalent circuit model of magnetic coupling wireless energy transfer system is used to derive the load resistance and transfer distance range that can maintain the frequency stability of the system. Furthermore, the load resistance range under which the system frequency stability is not affected by the transfer distance is obtained. In this range, the system always maintains a constant frequency and the natural oscillation frequency is not affected by the transfer distance. Moreover, the theoretical analysis is verified by simulation and experiment. The results show that the increase of load resistance and transfer distance will reduce the output power and transfer efficiency of the system to a certain extent. Therefore, in the context of maintaining the frequency stability of the system, the output power and transfer efficiency should be considered, and the appropriate load resistance and transfer distance should be selected so as to prevent the output power and transfer efficiency of the system from being too low.
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