Design of a three-phase unity power factor single-stage telecom rectifier

This paper presents the design and implementation of a three-phase unity power factor single-stage rectifier. The main use of the converter is expected to be in the telecommunications industry where it supplies constant DC voltage to the telecom network and charges the high capacity batteries while providing unity power factor to the utility. The converter is based on the flyback topology operating in discontinuous current mode (DCM). A fast dynamic response, low cost, small size, and a very simple control are the further viable benefits of the converter. The study includes finding an optimum transformer design with the lowest leakage inductance and the selection of components with the lowest parasitic effects for high efficiency and good performance. After the design is verified using the Simulink and PLECs models of the converter, a full-scale prototype was implemented to evaluate the performance of the design. Finally, experimental results demonstrate that converter works successfully and meet the design expectations.