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 1 kW laboratory prototype confirmed that the proposed system can achieve optimum operation and high efficiencies of the high-frequency inverter. K E Y W O R D Shigh-frequency inverter, series compensator, soft-switching, wireless power transfer Electr Eng Jpn. 2019;206:51-61.