Experimental Investigation and Optimal Air Gap Selection for Electric Vehicles Wireless Charging System

Electricals vehicles (EV) wireless charging system go on to be of interest due to its simplicity operation, robust, and safety. The focus is on presentation of equivalent electrical circuit of the Inductively Coupled Power Transfer (ICPT) system. This paper proposes a new method to obtain an easier calculation of the output power of the ICPT system. The present method is based on the Thevenin equivalent circuit. For improving the performance of ICPT system, a relationship between the mutual inductance, the resonance frequency and equivalent load resistance were demonstrated in detail. This formula was used to select the optimal air gap among transmitter and receiver coils. A prototype of an ICPT system has been built using two rectangular coils. Finally, the experimental results of the proposed system are presented and analyzed, by determining the input and output voltages and currents of the circuit.