Performance Investigation of Single Stage Luo AC-DC Power Factor Correction Converter

Abstract: This paper is proposed with the design, simulation, analysis of bridgeless negative output Luo converter with resistive load for open loop and closed loop with PI controller with the aim of improving the power factor and reducing the THD at the AC main side. To eliminate the requirement of front end diode bridge rectifier, the bridgeless topology converter is introduced for reduction in the conduction losses and to improve the power quality of the system. The Bridgeless negative Luo converter has been designed to operate in DICM and to act as an inherent power factor pre regulator. The MATLAB simulation is performed for bridgeless negative output Luo converter in Discontinuous Conduction Mode (DCM) of operation with 48V output voltage, 200 W output power with 30 kHz switching frequency. The PI controller is used to regulate the output voltage and improves the power factor to about 0.99 and reduces the source current THD to about 1.79% which is less than 5% as per IEEE-516 prescribed standard.

Keywords: Bridgeless Luo converter, PI controller, Power factor, THD.