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 instantaneous average line current control. Furthermore, thanks to the use of a single power converter, instead of the conventional configuration composed by a four-diode front end rectifier followed by a boost converter, a significant reduction in conduction losses is achieved. A prototype rated at 1.6 kW, operating at 70 kHz, with an input AC voltage of 220 Vrms and an output voltage of 400 VDC has been implemented in laboratory. An efficiency of 97.8% at 1.6 kW has been measured. Analysis, design and the control circuitry are also presented in the paper.<
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