Design And Implementation of Single Stage Bridgeless Ac to Dc Pfc Converter with Low THD for Ups Charging System

Design And Implementation of Single Stage Bridgeless Ac to Dc Pfc Converter with Low THD for Ups Charging System

M.Dhivyabharathi1, Dr.T.R. Sumithira2

1PG Scholar, Power Electronics & Drives, Government College of Engineering, Salem.

2Assistant Professor, Dept. EEE, Government College of Engineering, Salem.

Abstract - This study introduces a design and implementation of a single-stage bridgeless AC-DC power factor correction (PFC) converter for uninterruptible power supply (UPS) battery charging system. Traditional AC-DC converters typically employ a diode bridge rectifier followed by a DC-DC converter, which results in significant conduction losses and poor power quality due to high total harmonic distortion (THD). To address these limitations, a bridgeless topology is adopted to eliminate the diode bridge, thereby reducing conduction losses and improving efficiency. the proposed converter integrates power factor correction within a single-stage topology, simplifying the control mechanism and reducing component count. A suitable control strategy, typically employing average current mode control or voltage feedback loop, is implemented to ensure near-unity power factor and to maintain output voltage regulation under varying load and input conditions. Simulation and experimental results validate the effectiveness of the proposed design, demonstrating improved efficiency. The converter achieves efficient energy transfer with enhanced thermal performance, making it highly suitable for UPS battery charging systems where high reliability, power quality, and energy efficiency are critical.

Key Words:  Uninterruptible power supply (UPS), Single stage AC to DC converter, Sepic converter, PFC.