A Three-Phase Single-Stage AC-DC Full Bridge Converter with High Power Factor and Phase-Shift PWM

Converters that integrate the functions of power factor correction (PFC) and isolated dc-dc conversion in a single power converter have been proposed to reduce the cost associated with operating two separate switch-mode converters. Many low power ac-dc single-stage converters have been proposed in the power electronics literature, but very few three-phase single-stage full-bridge converters and these require sophisticated methods of control to do both the PFC and the dc-dc conversion. A new three-phase ac-dc full-bridge converter that operates with standard phase-shift PWM is proposed in the paper. In the paper, the operation of the new converter is explained and analyzed, its design is discussed, and experimental results that confirm the feasibility of the converter are presented.