SEPIC-derived three-phase sinusoidal rectifier operating in discontinuous current conduction mode

The paper 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 the cascade combination of a diode bridge and a single-ended primary inductor power 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 operated in discontinuous current conduction mode, the supply currents can be sinusoidally waveshaped with a near unity power factor. Moreover, step-up and step-down characteristics of output voltage can easily be obtained. The experimental and simulated results confirm the relevance of the presented configuration as an useful rectifier with sinusoidal supply currents and step-up/down output voltage regulation.