Soft-Switching Technique by Transfer Frequency of Wireless Power Transfer System Using Matrix Converter

Wireless power transfer system has been studied to improve safety and convenience in EV charging. This paper proposes soft-switching technique and control method for a wireless power transfer system using a matrix converter and an H-bridge converter. In this method, soft-switching is satisfied and the output power is controlled at constant in the matrix converter and H-bridge converter by appropriately controlling the effective value of the primary voltage, the voltage phase difference between the primary voltage and the secondary voltage, and the transfer frequency.