A new class of low-cost three-phase high-quality rectifiers with zero-voltage switching

Several new schemes For constructing 3 phi low-harmonic rectifiers are introduced here, These 3 phi 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 phi 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.