A Bridgeless Modified Boost Converter to Improve Power Factor in EV Battery Charging Applications

The primary objective of this research study is to develop and implement a novel topology aimed at enhancing the electric vehicle (EV) power factor at the front end of battery chargers. To eliminate the necessity for a diode-bridge-based converter in the EV battery charger, the proposed design utilizes a bridgeless power factor correction (PFC) converter. Battery charging is regulated in constant voltage and constant current modes by a dc-dc converter at the output of the proposed PFC converter. The proposed PFC converter uses a single sensing component, which ensures unity power factor at the input-side and stable dc load voltage, reducing device cost and complexity. The proposed topology achieves two crucial PFC criteria without the need for an inner loop or phase-locked loop, unlike the conventional PFC syste. This topology has several advantages, including longer battery life, reduced device stress, improved power quality, fewer harmonics in the input current, and lower input/output current ripple.