An Improved Lossless Passive Snubber Cell for PFC Boost Converter

Abstract

An improved loss less passive snubber cell for power factor correction (PFC) boost converter is proposed. All of the semiconductor devices in the boost converter are operated under soft switching condition. The switch operates at zero current switching (ZCS) turn on and zero voltage switching (ZVS) turn off. The boost diode is turned off under both ZCS and ZVS conditions and is turned on under ZVS condition. The converter has larger overall efficiency and wider soft switching range than that of the most active and passive snubber cells proposed before. The proposed snubber cell in this study has simple structure. The detailed steady-state analysis and the simulation of the proposed circuit are carried out, and this theoretical analysis is verified by implementing a 50 kHz - 1 kW converter. The overall efficiency of the proposed passive snubber cell is measured about %97.5 at full load.