BRIDGELESS BOOST CONVERTER FOR ENHANCED POWER FACTOR IN EV BATTERY CHARGERS

Abstract

This study focuses on the design and implementation of a novel topology to enhance the input power factor of electric vehicle (EV) battery chargers. The proposed approach employs a bridgeless power factor correction (PFC) converter instead of a conventional diodebridge rectifier, reducing losses and improving efficiency. A DC–DC converter follows the PFC stage to control battery charging in both constant voltage (CV) and constant current (CC) modes. With only a single sensing element, the system achieves near-unity input power factor while maintaining a stable DC output voltage, making it cost-effective and simpler to implement. Unlike traditional PFC designs, the proposed topology meets critical PFC requirements without using an inner control loop or phaselocked loop. Key advantages include extended battery life, reduced component stress, improved power quality, lower harmonic distortion in the input current, and reduced current ripple at both input and output.