无线电能传输系统实本征态与零相角点分析

磁耦合无线电能传输(Magnetic coupling wireless power transfer, MC-WPT)系统的能效受原副边线圈距离的影响较大。在过耦合状态下，由于发生了频率分裂，会导致系统的能效随着传输距离的减小而下降。通过本征模态理论求取系统的实本征态工作条件使系统在过耦合区保证在零相角点处以最大能效工作。并从零相角点的角度出发对比该工作模式和实本征态模式的相似之处。从而实现了利用频率跟踪使系统在过耦合区保持恒功率和恒效率输出。最后，进行了仿真验证，证实了本文计算结果的正确性。

Analysis of real eigenstates and zero phase angle of wireless power transfer system

The energy efficiency of the magnetically coupled wireless energy transmission system is greatly affected by the distance between the primary and secondary coils. In the over-coupled state, the energy efficiency will decrease as the transmission distance decreases due to the frequency splitting of the system. In this paper, the actual eigenstate working conditions of the system are obtained through the eigenmode theory so that the system can ensure maximum energy efficiency in the over-coupling region and the similating betewwn the actual eigenstate and the real eigenstate is compared from the perspective of the zero phase angle point. Thus, frequency tracking is used to make the system maintain constant power and constant efficiency output in the over coupling region. Finally, the correctness of the calculation results in this paper is verified by simulation.