Soft-switching unity power factor rectifiers with reduced conduction losses

摘要: This paper presents a survey on single-phase soft-switching unity power factor rectifiers with reduced conduction losses. The reduced conduction losses are achieved by the employment of a single converter, instead of the typical configuration composed by a front end rectifier followed by a boost converter. Among several possible soft-switching topologies, two are selected for analysis and further experimentation. The first converter is a ZVS step-up converter, which features regulation by conventional PWM and instantaneous average line current control. The second one is a quasi-resonant ZCS step-up converter which features current-sense frequency control and soft commutation with no auxiliary switches. Experimental results for a 1,6 kW ZVS-PWM prototype operating at 70 kHz and a 830 W ZCS-FM converter are presented. (author) 8 refs., 15 figs.