A Power Quality Improved Ev Charger With Bridgeless Cuk Converter

An improved bridgeless (BL) Cuk converter based EV (Electric Vehicle) battery charger with high power factor (PF) and increased efficiency, is designed and developed in this work. It provides low cost and high power density based charging solution for EV. This charger incorporates less number of devices operating over one switching cycle, which reduces the additional conduction loss incurred by a diode bridge rectifier of conventional charger. Hence, it improves the charger efficiency. The added advantage of proposed topology is that the unwanted capacitive coupling loop is removed, as well as unwanted conduction through the body diode of inactive switch in previously developed BL Cuk converter is avoided. This significantly improves the charger efficiency. For the constant current (CC) and constant voltage (CV) charging, the commands, are synchronized by a flyback converter.  The proposed charger draws a sinusoidal current from AC mains along with the total harmonic distortion (THD) in supply current is reduced to the limits specified by the IEC 61000-3-2 guidelines. The improved efficiency and PQ indices of proposed charger, are investigated to demonstrate its satisfactory charging operation at all operating conditions.