Power Control in the Dynamic Wireless Charging of Electric Vehicles

This paper proposes a new power control method which is able to control the varying charging power according to the state of charge of the battery in the dynamic wireless charging of electric vehicle. The advantage is that the dual-side wireless communication is avoided. A dual-loop primary controller is proposed to regulate the charging power which only employs the primary side controller. The information on system parameters and the coupling coefficients are required. However, in the dynamic wireless charging the coupling coefficients change continuously. This paper also presents the coupling coefficients estimation method from the primary side. The simulation and experimental results validate the feasibility of the proposed control method. A 1.5 kW dynamic charging prototype is constructed. The experimental results show that the output power is adjustable in dynamic charging process with error less than 0.2% and the system maximum efficiency from dc source to the optimal load reaches 89.5%.