Research of Silicon Carbide LLC Resonant Converter in Electric Vehicle Charging System

Abstract

The development of charging system for high power density electric vehicle is of vital importance to the development of the new generation of high-power electric vehicles. First, a soft-switching DC/DC resonant converter in Electric Vehicle is proposed, which is based respectively on silicon carbide and silicon power devices. The output power of the converter is 3.3kW, and the highest efficiency of the system can reach 98.26%.Then, the problem of parasitic inductance in Silicon Carbide devices under high frequency is analyzed, and the solution is provided. Finally, conclusions comes that the DC/DC resonant converter using SiC power devices is of lower power loss, higher system efficiency, and higher power density, which is surely favorable for the performance and efficiency of electric vehicle charging system.