Efficiency improvement of high-frequency inverter for wireless power transfer system using series compensator

摘要

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.