基于电容阵列的磁共振式无线电能传输系统的优化调谐

Optimal parameter matching based on capacitor array for magnetically-resonant wireless power transfer system

在实际运行时,由于高频电路杂散电感、电容与环境变化等因素的影响,磁共振式无线电能传输系统的传输线圈参数常会发生漂移,从而影响系统的传输效率和传输功率。首先根据系统模型的仿真分析得到发射端电流峰值与系统对称度的关系,以此设计一种优化匹配的方法和电路,使得发射端电流峰值自适应跟踪调节,使系统性能达到优化匹配。实验验证了该方法的有效性,相比于失谐状态,所提方法可以大幅度提高传输效率,同时降低了系统对杂散电感、电容、环境变化等因素的敏感性。

Because of different influencing factors in practical operation,such as the stray inductance and capacitance of high-frequency circuit and the environmental variation, the transmission coil parameters of magnetically-resonant wireless power transfer system often drift,impacting the transmission efficiency and power. The relationship between the peak current at transmitting terminal and the symmetry of system is obtained by the simulative analysis based on system model and an optimal matching method with corresponding circuit is designed to track and adaptively tune the peak current at transmitting terminal for the optimal matching of system performance. Experiment verifies the effectiveness of the proposed method. Compared with the mismatched conditions,the proposed method can significantly improve the transmission efficiency and decrease the system sensitivity to stray inductance,capacitance and environmental variation.