Variable Frequency Control for Constant Current Constant Voltage Inductive Wireless EV Charging System

Abstract

EV market has risen despite COVID-19 pandemic. Wireless EV charging is safer operating, saves the environment, and is convenient with automated charging. Inductive wireless EV Charging (IPT) should be fewer power electronics components to improve the system's efficiency. This paper presents the fewer components constant current - constant voltage (CC-CV) IPT using frequency adaptive frequency control technique that does not need a primary dc-dc converter. The proposed CC-CV IPT charging building block consists of the front-end rectifier, CC-CV frequency controlled inverter, IPT coils, secondary high-frequency rectifier, and step resistive load battery simulator. The load current and voltage signals are detected and feedback to the PI control block that controls the frequency of the PWM gate drive of the inverter. The simulation and experimental results show the operating mode of 6A CC and 102 V CV chargings were performed. The wireless EV charging can be operated for the CC and CV chargings using variable frequency control.