Analysis and design of an isolated single-stage converter achievingpower-factor correction and fast regulation
Tsai-Fu Wu; Yu-Kai Chen
Industrial Electronics, IEEE Transactions on
Volume 46, Issue 4, Aug 1999 Page(s):759 - 767
Digital Object Identifier   10.1109/41.778230
Summary:This paper presents the analysis and design of an isolated single-stage converter achieving high-power-factor correction and fast regulation. By using the technique suggested by Wu et al., a buck-boost converter and a flyback converter can be integrated to form the discussed converter. The buck-boost semistage working in the discontinuous conduction mode (DCM) functions as a power-factor corrector, and the flyback semistage operating in the DCM is a voltage regulator which is controlled, theoretically, to be independent of load variation. An approximated small-signal model of the converter operating in the DCM is developed. Design of a peak-current feedback loop with an optimal proportional integral controller is also presented. A prototype is implemented to verify that the analysis and design are effective and feasible

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