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PWM full-bridge converter with natural input power factor correction

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4 Author(s)
Moschopoulos, G. ; Dept. of Electr. & Comput. Eng., Univ. of Western Ontario, London, Ont., Canada ; Mei Qiu ; Pinheiro, H. ; Jain, P.

A pulsewidth modulated (PWM) full-bridge converter that simultaneously performs input power factor correction (PFC) and DC-DC conversion is proposed. The converter is the same as the standard voltage-fed PWM full-bridge converter with a diode-bridge low-pass filter front end, but with a slight modification that results in an improvement in power factor that is sufficient to satisfy the EN61000-3-2 requirements for electrical equipment. The operation of the converter is explained and analyzed, and the results of the analysis are used to determine the converter's steady-state characteristics, which are discussed in detail. A design procedure for the selection of components is then derived and demonstrated with an example. The feasibility of the converter and its ability to satisfy EN61000-3-2 requirements on electrical equipment is shown with results obtained from an experimental prototype.

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Aerospace and Electronic Systems, IEEE Transactions on  (Volume:39 ,  Issue: 2 )