Performance Analysis of Isolated Bridgeless SEPIC Converter for EV Battery Charging

Abstract

The conventional Electric Vehicle(EV) battery charging systems with power factor correction circuits have limitations due to conduction losses present in the input side bridge rectifiers. This paper presents a Bridgeless Isolated Single-Ended Primary Inductance Converter (SEPIC) with improved power factor and reduced THD to increase performance. Throughout the charging time of the Electrical Vehicle, the input side maintains a near-unity power factor. Because the DBR is eliminated, the current is conducted through a smaller number of devices, resulting in considerable reductions in conduction losses. This optimizes the charging system's efficiency in alternative to the existing BL SEPIC converter. A constant current/constant voltage controlling mode is used to charge the EV battery, which delivers good results in terms of intrinsic PFC and decreased THD, hence increasing the charging performance of this system.