COMPARATIVE ANALYSIS OF POWER FACTOR CORRECTION TECHNIQUES FOR AC/DC CONVERTER AT VARIOUS LOADS

Abstract: In this paper, two generalized topologies of single stage circuits such as Boost+flyback converter & Quasi active power factor correction (PFC) converter circuits are designed and their performance comparison is presented. Converters connected to the mains have the potential of injecting current harmonics that may cause voltage distortion. These harmonics can be significantly reduced if the input power factor is corrected by shaping the input current so that it is sinusoidal and in phase with the supply voltage. In the proposed quasi active PFC system, the power factor is drastically improved by using an auxiliary winding coupled to the transformer of a cascade dc/dc fly back converter. The proposed converter is presented and compared with boost+flyback converter for different loads and inputs. Simulations and analysis are carried out in MATLAB/SIMULINK with this control method for both systems and the results presented show the effectiveness of the improved converter topology.

Keywords: AC/DC converters, power factor correction (PFC), single stage, Fly back converter, total harmonic distortion (THD)