Design-oriented hopf bifurcation boundary in parallel-connected buck converters under democratic current-sharing control

H.H.C. Iu, Chi Kong Tse

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review


This paper studies a system of parallelconnected dc/dc buck converters under democratic currentsharing control. Under this control scheme, the reference current is generated by a typical proportional-integral (PI) controller for voltage regulation and the currents in individual converters are programmed by a built-in interleaving switching control. The effects of variations of practical parameters such as proportional gain, integral time constant, duty ratio and output power level are studied. Extensive simulations are performed to capture the Hopf bifurcation boundary which is the first instability boundary of practical importance. Unlike those in some previous studies which use abstract system parameters, the results in this paper are presented in terms of practical parameters and hence can be directly used for comparison of operating ranges for practical parallel-connected converters.
Original languageEnglish
Number of pages5
Publication statusPublished - 2006
EventInternational Symposium on Nonlinear Theory and Its Applications (2006)||NOLTA2006 -
Duration: 1 Jan 2006 → …


ConferenceInternational Symposium on Nonlinear Theory and Its Applications (2006)||NOLTA2006
Period1/01/06 → …

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