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Calculation of steady‐state solution of parallel‐connected buck converters with active current sharing and its parameter sensitivity
Author(s) -
Li Ming,
Tse Chi K.,
Ma Xikui
Publication year - 2011
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.633
Subject(s) - sensitivity (control systems) , converters , control theory (sociology) , current (fluid) , operating point , buck converter , steady state (chemistry) , computer science , voltage , point (geometry) , electronic engineering , engineering , control (management) , mathematics , electrical engineering , chemistry , geometry , artificial intelligence
Abstract In this paper, the effect of active current‐sharing control on the steady‐state operation of parallel‐connected buck converters is investigated. The system under study consists of N voltage‐mode‐controlled buck converters connected in parallel. Three kinds of active current‐sharing schemes are considered, namely, master–slave scheme with automatic master, master–slave scheme with dedicated master, and democratic scheme. Using the principle of charge balance, the mechanism of the operating point drift arising from active current sharing is examined. A general formulation of the steady‐state solution under active current sharing is derived. Moreover, detailed parameter sensitivity analysis is performed to evaluate the effect of parameters' variation on the operating point. The results from sensitivity analysis can be used to categorize parameters for facilitating practical design. Computer simulations are presented to verify the analytical results. Copyright © 2010 John Wiley & Sons, Ltd.