Isolated Bridgeless SEPIC PFC Converter for EV Battery Charging Application

In this study, the analysis, design, and simulation of a bridgeless (BL) PFC SEPIC are emphasized concerning their applicability in electric vehicle battery charging systems. Through the utilization of a cascaded controller, the analysis emphases observing efficiency, gain, and power factor correction in the closed-loop BL-isolated SEPIC converter. Additionally, it seeks to showcase enhanced efficiency and improved power factor compared to the conventional topology. The study extensively evaluated the efficiency, PFC behaviour and THD of input supply current in the converter. The performance of this charger is examined with low ripple-based charging and to improve the power quality indices at AC mains for rated and sudden changes in line voltages. Extensive simulink simulation results of BL-isolated SEPIC PFC converter for various operating conditions are presented. The evaluation includes measuring the THD in the input current, adhering to the guidelines set by the recommended IEC 61000- 3-2 standard. For every operative circumstance, the power factor on the input side is found to be equal to one. This substantiates the superiority of the converter for battery charging applications.