A Full Soft Switched Bridgeless Power Factor Corrected AC-DC Converter

In this study, a soft swithed and bridgeless power factor corrected (BPFC-FSS) boost converter with an active snubber cell is presented. The converter is operated with pulse with modulation (PWM) and the average current mode control is used to generate PWM signals. The soft switching operation of all semiconductors is achieved by a snubber circuit in introduced converter. The snubber circuit allows zero voltage transition (ZVT) turn on and zero voltage switching (ZVS) turn off for the boost switch. In addition, zero current switching (ZCS) turn on and ZVS turn off of the snubber switch are provided. The boost diode and the other snubber diodes work with soft switching. Moreover, the current stress of the snubber switch is descended by the soft switching energy delivery to the output. Thes soft switching operation of all semiconductors is accomplished for different load case. Thus, the conduction and switching losses are reduced and the efficiency is increased. The theoretical analysis of the BPFC-FSS is presented and validated with a simulation work operating at 100 kHz, with 1 kW output power and 400 V output voltage.