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

A SEPlC derivcd three-phase rectifb is proposed to achieve clean sinusoidal input current, unity power factor, step up/down DC voltage and to be insensitive to input voltage distortion. Depending upon how many boost modes are choscn and which class of generalised zero voltage space vector is selccted to obtain thc equivalent DC duty cycle, different control strategies can be obtained. It is seen that through introduction of an equivalent duty cycle the DCiDC SEPlC converter function can be maintained without affccting the desired rectifier characteristic. The input to output voltage gain for two control strategies is also derived. Finally, a hardware implementation example and somc cxperiniental results are given to demonstrate the validity of the proposed rectifier.