A Three Level Integrated Ac-dc Converter with Power Factor Correction

In this paper, a three-level integrated ac–dc converter with power factor correction is presented. The proposed converter integrates the operation of the boost power factor correction and the three-level dc–dc converter. The converter is made to operate with two independent controllers—an input controller that performs power factor correction and regulates the dc bus and an output controller that regulates the output voltage. The input controller prevents the dc-bus voltage from becoming excessive while still allowing a single-stage converter topology to be used. The feedback system employed in this converter is to improve power factor by ZVS method in the PWM pulse generation to the switches. Experimental results obtained from a simulation are presented to confirm the output of the new converter.