High power factor three-phase rectifier with two interleaved single-phase buck rectifier

In this work, a unity power factor isolated three-phase buck rectifier is proposed. Based on the Scott transformer and using a two interleaved single-phase Buck pre-regulator in continuous conduction mode (CCM), this rectifier is simple and it has the capability to obtain low output voltage. With only two active switches with same reference, only one freewheel diode, the rectifier is able to generate symmetrical currents in the line and a regulated voltage output. The modulation is used conventional SPWM. The control has only one voltage control loop. Theoretical analysis, design procedure, complete simulation results with closed loop operation are given and a 6-kW prototype has been implemented in the laboratory which demonstrated to operate successfully with excellent performance.