I. Introduction
The buck-type PFC is best suitable for charging EV where 400V dc is a good approach for the voltage level of the connection among the battery, motor, and charger[1]. Control of the CSI is simpler, it can buffer the output from grid voltage fluctuations, generates a predetermined magnitude of current to the grid and can thus achieve a high power factor[2]. Its output current is less dictated by the grid voltage. Moreover, it has inherent short circuit protection. Recently, the third-generation semiconductor devices such as the GaN and the SiC have been developing rapidly. They have fast switching speed, ultralow on-state resistance and high breakdown voltage, high temperature tolerance and high thermal conductivity, thus they are suitable for electrical vehicle (EV) [3]