Design of Charging Module for DC Charging Pile Based on Two Level Power Conversion

In order to to solve the demand of electric vehicle for high power and high performance DC charging pile, this paper presents a design scheme for charging module of DC charging pile based on two stage power transformation. The pre stage part of the scheme is the VIENNA rectifier controlled by hysteresis current and the phase shift full bridge converter controlled by the average current. The parameters of the main circuit and the control circuit are calculated. At last, the simulation research on the three conditions of the rated load, two times overload and load fluctuation is carried out. The results show that the charging module can achieve high power factor, low harmonic distortion rate, zero voltage switch, low loss operation, strong carrying capacity, good dynamic performance, high steady state precision and simple and easy operation. (paper)