SEPIC derived three-phase switching mode rectifier with sinusoidal input current

A SEPIC derived three-phase rectifier is proposed to achieve clean sinusoid al input current, unity power factor, step up/down DC voltage and to be ins ensitive to input voltage distortion. Depending upon how many boost modes a re chosen and which class of generalised zero voltage space vector is selec ted to obtain the equivalent DC duty cycle, different control strategies ca n be obtained. It is seen that through introduction of an equivalent duty c ycle the DC/DC SEPIC converter function can be maintained without affecting the desired rectifier characteristic. The input to output voltage gain for two control strategies is also derived. Finally, a hardware implementation example and some experimental results are given to demonstrate the validit y of the proposed rectifier.