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

Several new schemes for constructing 3φ low harmonic rectifiers are introduced. These 3φ AC-DC topologies are derived from parent DC-DC power converter topologies. With a single active switch featuring the zero-voltage switching property (ZVS) 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 3φ 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 schemes to demonstrate the validity of the proposed concepts