Single-Stage PFC Topology Employs Two-Transformer Approach For Improved Efficiency, Reliability, And Cost

by Fuxiang Lin, Independent Researcher, Sydney, Australia and Fuyong Lin, Hua Qiao University, Mechanical Department, Xiamem, Fujian, China, How2Power Today, Dec 16 2013

Focus:
A new single-stage power factor correction (PFC) power supply topology uses two transformers. The main transformer transfers energy from the primary circuit to the secondary circuit, while the auxiliary or forward transformer provides energy to correct the power factor (PF) of the input current waveform. The primary windings of these two transformers are connected in series. This topology, which employs discontinuous conduction mode (DCM) operation, can be used in all power supply topologies including single-switch types such as forward and flyback converters, and in half-bridge, full-bridge and LLC-resonant converters. Within a flyback design, this circuit can operate from a universal input. With forward and half-bridge implementations, this circuit can operate from an input range of either 180 to 260 V ac or 90 to 150 V ac. This new topology promises high efficiency, high reliability and lower cost versus existing designs. In this article, the operating principles, inductor design, and forward transformer design for this topology are explained and experimental results are presented. Article begins by discussing limitations of existing single-stage and two-stage PFC topologies.

What you’ll learn:

• How to improve the performance of a single-stage PFC power supply

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