A NEW ZVS-PWM UNITY POWER-FACTOR RECTIFIER WITH REDUCED CONDUCTION LOSSES

This paper introduces a new single-phase high power Factor rectifier, which features regulation by conventional PWM, soft commutation and in stantaneous average line current control. Furthermore, thanks to the u se of a single converter, instead of the conventional configuration co mposed of a four-diode front-end rectifier followed by a boost convert er, a significant reduction in the conduction losses is achieved. A pr ototype rated at 1.6 kW, operating at 70 kHz, with an input ac voltage of 220 Vrms and an output voltage of 400 V-dc has been implemented in laboratory. An efficiency of 97.8% at 1.6 kW has been measured. Analy sis, design, and the control circuitry are also presented in the paper .