Application Oriented SEPIC Converter with Improved Voltage Gain for Electric Vehicle Battery Charger

Abstract

This paper proposes an application-oriented SEPIC (Single-Ended Primary Inductance) converter with modified buck converter for an electric vehicle (EV) charger with high voltage gain. The key benefit of this converter is lowering the switching voltage for the same output voltage. Lower duty cycle leads to lower the conduction losses. As a result, the suggested converter is appropriate for EV chargers with large power ratings. As a result, total efficiency of charger will improve. Discontinuous conduction mode (DCM) is used to provide soft switching for diodes and switches. This improved converter is coupled with a modified buck converter, designed to regulate the current through the battery during the charging period. Modified buck converter has less number of switches and diodes, results in lower switching losses. To confirm the inherent Power Factor (PF) correction qualities to meet the IEC 61000-3-2 criteria, a SIMULINK model has been proposed and tested on electric vehicle battery. The results of this proposed converter have established better performance in terms of greater gain, reduced conduction loss, and an improved efficiency over a traditional one.