A New Class of Low-Cost Three-Phase High-Quality Rectifiers with Zero-Voltage Switching

Several new schemes for constructing 3 lowharmonic rectifiers are introduced here. These 3 ac–dc topologies are derived from parent dc–dc converter topologies. With a single active switch featuring the zero-voltage switching (ZVS) property in addition to the diode-rectifier bridge, the rectifiers are capable of naturally drawing approximately sinusoidal input-current waveforms at nearly unity power factor. Thus, a family of low-cost high-efficiency 3 high-power-factor rectifiers is obtained. A second power switch can be introduced to further improve the current waveshape. Simulation results are supplied for each of the proposed schemes to demonstrate the validity of the proposed converters.