Efficiency Improvement of High Frequency Inverter for Wireless Power Transfer System Using Series Compensator

Abstract

This paper proposes a wireless power transfer system using a series compensator GCSC (Gate Controlled Series Capacitor) as a primary side capacitor. The GCSC is a circuit module that functions as a series variable capacitor by controlling semiconductor switches. The advantage of applying the GCSC to the primary side capacitor is that it provides controllability of the output power factor for a high frequency inverter. Therefore, optimum operation of the high frequency inverter can be achieved irrespective of the coil parameters by controlling the output power factor. Experimental results with a 1kW laboratory prototype confirmed that the proposed system can achieve optimum operation and high efficiencies of the high frequency inverter.