Design and Development of a 3.2 kW Wireless Battery Charger for an Electric Vehicle with a High-Frequency Full-Bridge Converter Using MATLAB Simulink

Abstract

In this paper, the design of a high-frequency power converter based wireless battery charger is proposed for efficient transmission of electricity. Wireless battery charging enables the users to use their electric vehicles without any attached connectors. Wireless power transfer technology (WPTT) has advantages like ease of operation, low maintenance, high safety, high reliability, and highly durable operational service life. It is already being used in a wide variety of applications such as mobile battery chargers, space, military, and biomedical applications. However, the design of a wireless power battery charging scheme requires the critical design of inductive coils which includes careful selection of their inductances. According to the design of the coil, the distance between transmitter and receiver coil and the power required to be transferred, a high-frequency full-bridge converter is required to be tuned. In this paper, the effect of self inductances of the wireless inductive coils and the distance between them in the form of mutual inductance with respect to frequency of power converter is studied using MATLAB / Simulink environment. A 60V, 30Ah lithium-ion battery pack is charged with the designed wireless battery charger. The theoretical and simulation results presented in this paper suggest that with the help of a high-frequency bridge converter wireless power transfer at an efficiency of 85 % can be achieved with an air gap of 10 cm between the coils.