Bridgeless Power Factor Correction Converter Working at High Load Variations

The conventional boost power factor correction converter has high conduction losses because of the input rectifier. The use of a bridgeless PFC circuit offers high efficiency. For high powers, the bridgeless circuit will be designed to work in continuous conduction mode (CCM), using an average current mode control. The switches have parasitic capacitances that in CCM lead to switch losses, without influencing the waveform of the converters. For low loads, the discontinuous conduction mode (DCM) appears, but the parasitic capacitances lead to the input current distorsion. This paper focuses on the simulation and analysis of bridgeless PFC converter working at high load and low load and possible solutions to eliminate the distortion of the current working at low power.