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

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