Comparitive study of Single Phase Power Factor Correction based on Fixed and Variable PWM Techniques using Bridgeless Cuk Converter

This paper deals withthe comparative study of single phase Power Factor Correction (PFC)based on fixed Pulse Width Modulation (PWM) and variable frequency control techniquesusing Bridgeless Cuk converter. Design equations and state model of the BridglessCuk converter to aid the control loop are derived based on the modes of operation. The control strategy uses an outer Proportional Integral (PI) controller to normalize output voltage and inner PI controller to shape the input current. PI controller parameters are determined using Tyreus-Luben method. Simulation results are presented to validate the two approaches. Advantages of the proposed scheme are simple method of generating reference currents using the multiplier approach, power factor close to unity, low %THD, regulated output voltage for load variations and effective set point tracking.