A simple AC-DC PWM full-bridge converter with integrated power factor correction

A simple AC-DC PWM converter that can perform isolated DC-DC conversion while shaping the input current to improve power factor is proposed in this paper. The converter is almost the same as a standard PWM full-bridge converter with a diode rectifier/LC low-pass filter input except for some slight modifications. The converter topology is therefore very simple, as is the method of control used to achieve both PFC and DC-DC conversion. In the paper, the operation of the converter is explained and analyzed, and the converter´s steady-state characteristics are discussed. A design procedure for the selection of components is presented, then demonstrated with an example. The feasibility of the converter, and its ability to meet EN61000-3-2 Class D standards for electrical equipment is shown with results obtained from an experimental prototype.