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

Several new schemes for constructing three-phase low-harmonic rectifiers are introduced here. These three-phase AC-DC topologies are derived from parent DC-DC power 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 three-phase high-power-factor rectifiers is obtained. A second power switch can be introduced to improve the current waveshape further. Simulation results are supplied for each of the proposed schemes to demonstrate the validity of the proposed power converters