Series Filter Computational Method for CCM Recovery in Double Side LCC WPT System

Fundamental harmonic analysis (FHA) model is widely used for wireless power transfer (WPT) due to its physical insight and compact form (for example, 8RL/2) of diode rectifier equivalent resistance. Because this compact form is valid for continuous conduction mode (CCM), and resonant tank parameters such as inductance and capacitance are independent of equivalent resistance when designing these parameters based on double side LCC (DS-LCC) FHA model, the selected optimal parameters may not satisfy the CCM prerequisite. This will make actual system characteristics deviate from the FHA model predictions, especially the output voltage and power. Therefore, the original optimal design is invalid and designer needs to execute a circular design, namely designing resonant tank parameters based on FHA model, then judging or simulating whether satisfy CCM operation, redesigning parameters if not satisfy CCM. In order to validate the original optimal design even if CCM isn`t established and make design process straightforward, an effective remedy which is adding a series LC filter in secondary side is proposed, and a computation method about the required minimum filter parameter is provided. Effectiveness of proposed remedy is verified by simulation and experiment. Besides, computation method is packaged as a program to help researchers design rapidly.