Two Stage single-phase EV On-Board Charger Based On Interleaved Cascaded Non-Inverting Buck-Boost Converter

Abstract

This paper proposed a two-stage electric vehicle (EV) on-board charger (OBC). The proposed charger is composed of a front-end ac-dc converter that is based on an interleaved buck-boost converter with reduced power electronics devices count. One of the main features of the proposed front-end ac-dc converter is the reduction of the inrush current due to the soft start-up capabilities. In addition, the buck stage helps to block and to isolate the fault current in case of dc-dc converter failure. Moreover, the proposed control algorithm for the front-end ac-dc converter regulates the dc output voltage and enables the converter to draw a sinusoidal current from the grid with a high power factor. The back-end dc-dc converter consists of a single active bridge (SAB) where the phase shift control is used to simplify the circuit of the proposed OBC. The back-end converter control loops enable operation under current control mode and voltage control mode for charging the battery bank. The PSCAD/EMTDC software package is used to simulate the proposed OBC and to evaluate the dynamic performance under different operating conditions.