New ZCS turn-on and ZVS turn-off unity power factor PWM rectifier with reduced conduction loss and no auxiliary switches

A ZCS turn-on and ZVS turn-off unity power factor PWM rectifier, which features soft switching with no auxiliary switches and reduced conduction losses is presented. The ZVS and ZCS switching are achieved by using a simple commutation circuit with no auxiliary switches, and reduced conduction losses are achieved by employing a single converter instead of a typical front-end diode rectifier followed by a boost rectifier. Furthermore, thanks to features such as simple PWM control at constant frequency. Low switch stress and low VAr rating of commutation circuits, it is suitable for high-power applications. The principle of operation is explained and analysed, and the design considerations and experimental results of the new converter are included.