A Quasi Impedance Source Inverter based Wireless Power Transfer System for Battery Charging Applications for Electric Vehicle

In this paper, a quasi-impendence source-based inductive type wireless power transfer rapid charging system of 60 kW is presented. The proposed system consists of a quasi Z-source converter (required to boost the input voltage) followed by a high-frequency inverter and an inductive coil with capacitive compensation. At the receiver end, a buck converter is placed which is controlled in Constant Current (CC) or Constant Voltage (CV) charging modes depending upon the State Of Charge (SOC). Both CC and CV are achieved by two separate PI controllers. The proposed system delivers 60 kW power at 135A to charge the battery in less than 30 min from 0 to 80 % SOC. The simulation results obtained using MATLAB are in accordance with the commercial guidelines for the battery charging operation. Detailed simulation results are provided thereby exploiting various aspects of the proposed charger. The results of the hardware prototype are provided for proof of concept.