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Title: Design-oriented hopf bifurcation boundary in parallel-connected buck converters under democratic current-sharing control
Authors: Iu, HHC
Tse, CK 
Issue Date: 2006
Source: Proceedings of The 2006 International Symposium on Nonlinear Theory and Its Applications (NOLTA'2006), Bologna, Italy, 11-14 September 2006, p. 516-520 How to cite?
Abstract: 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.
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