Fast-scale bifurcation in single-stage PFC power supplies operating with DCM boost stage and CCM forward stage

• Published in: International journal of circuit theory and applications Vol. 34; no. 3; pp. 341 - 355
• Main Authors: Wu, Xiaoqun, Tse, Chi K., Wong, Siu Chung, Lu, Junan
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.05.2006; Wiley
• Subjects: Applied sciences; bifurcation; dc-dc converter; Electrical engineering. Electrical power engineering; Exact sciences and technology; fast-scale instability; Power electronics, power supplies; power factor correction; single-stage converter; Power converter; fast-scale instability; dc-dc converter; single-stage converter; Computer simulation; Direct current convertor; Equivalent circuit; Bifurcation; Power factor correction; Instability; Power supply
• ISSN: 0098-9886; 1097-007X
• DOI: 10.1002/cta.357

This paper describes the fast‐scale bifurcation phenomena of a single‐stage single‐switch power‐factor‐correction (PFC) regulator comprising a boost stage operating in discontinuous conduction mode (DCM) and a forward stage operating in continuous conduction mode (CCM). The two stages combine into a single stage by sharing one main switch and one control loop. Using ‘exact’ cycle‐by‐cycle computer simulations, the effects of various circuit parameters on fast‐scale instabilities are studied. The results are qualitatively verified by experimental measurements. This work provides a clear picture of how the variation of certain practical parameters can render such a circuit fast‐scale unstable. Copyright © 2006 John Wiley & Sons, Ltd.