A CLCC Impedance Matching Method Under Maximum Efficiency Tracking in Wireless Power Transfer System

The key problem of the wireless power transfer (WPT) system is transfer efficiency, transfer efficiency will be affected by the variation of transfer distance or load resistance. The CLCC matching network is designed to eliminates the influence of nonlinear characteristics of the rectifier circuit, the programmable capacitor array (PCA) is introduced to realize the wide capacitance adjustable range, which ensures the system can always track the optimal resistance. The experimental results agree well with the theoretical analysis, the suggested impedance matching network can achieve load variation up to
$600\Omega$
under maximum efficiency tracking control (METC).