SEPIC-DERIVED 3-PHASE SINUSOIDAL RECTIFIER OPERATING IN DISCONTINUOUSCURRENT CONDUCTION MODE

The gaper presents a novel three-phase single-way sinusoidal rectifier to reduce supply current distortions and low power factor operations with diode bridge rectifiers. The circuit configuration is based on th e cascade combination of a diode bridge and a single-ended primary ind uctor convertor, in which a single power switching device provides the necessary control of the currents. If a simple pulsewidth modulation with uniform duty factor is introduced and if the rectifier is operate d in discontinuous current conduction mode, the supply currents can be sinusoidally waveshaped with a near unity power factor. Moreover, ste p-up and step,down characteristics of output voltage can easily be obt ained. The experimental and simulated results confirm the relevance of the presented configuration as an useful rectifier with sinusoidal su pply currents and step-up/down output voltage regulation.