A New 3-phase Buck-Boost Unity Power Factor Rectifier with Two Independently Controlled DC Outputs

A new 3-phase buck-boost unity power factor rectifier consisting of a 3-phase bridge buck PFC rectifier and two boost dc-dc converters connected in series is proposed for an industrial application where two independent output voltages need to be controlled. This paper presents the proposed topology and the requirements for this application. The proposed and alternative topologies are briefly compared. Through this comparison, it is shown that the proposed topology offers the best solution in terms of simplicity and functionality. The operation of the new topology is described in detail and then the control strategy including PWM calculations to obtain the best performance is given. The validity of the theory and practicality of the new rectifier system is confirmed through simulation and experimental results obtained from a 5 kW prototype.