Modified Cuk PFC Rectifier with High Step-down Step-up Output Voltage and Continuous Input and Output Currents

This paper proposes a new high step-down-up power factor correction active rectifier. The main positive improvement of the proposed rectifier compared to previous converters, is the provision of the positive buck-boost voltage gain ratio with the lowest number of semiconductor device count and the continuous input and output currents. The converter also provides high step-down operation, and facilitates positive output voltages with a low number of semiconductor devices conducting simultaneously. Acceptable ac grid current quality, high power factor, and high efficiency are also achieved. Experimental results are presented for a 0.5 kW prototype, operating from Vrms = 220 V input to Vdc = 48.0 V output. The overall solution is substantiated through comprehensive analysis and experimental demonstrations the capability for high step-down and step-up ac to dc power conversion with a peak efficiency of 96.7%.