Parasitics Realization in State-Space Average-Value Modeling of PWM DC #x2013;DC Converters Using an Equal Area Method

TitleParasitics Realization in State-Space Average-Value Modeling of PWM DC #x2013;DC Converters Using an Equal Area Method
Publication TypeJournal Article
Year of Publication2007
AuthorsDavoudi, A., and J. Jatskevich
JournalCircuits and Systems I: Regular Paper s, IEEE Transactions on
Volume54
Pagination1960 -1967
Date Publishedsep.
ISSN1549-8328
Keywordscontinuous conduction mode, DC-DC power convertors, equal area method, nonlinear waveform, parasitics realization, piecewise linear techniques, piecewise-linear waveforms, pulsewidth-modulation dc-dc converters, PWM power convertors, state-space average-value modeling, state-space methods, waveform analysis
Abstract

Average-value modeling of pulsewidth-modulation dc-dc converters is often based on the assumption of piecewise-linear waveforms of the circuit variables, whereas considering parasitics introduces waveform nonlinearity and complicates the model derivation. This paper presents a new approach that considers averaging with nonlinear waveforms using the equivalent area method, and proposes a state-space averaged model that is fairly accurate and seamlessly functional in both continuous and discontinuous conduction modes. The resulting average-value model is applicable for large-signal transient studies as well as for linearization and subsequent small-signal analysis. The proposed model is validated with a hardware prototype and a detailed simulation, and is shown to be an improvement over previously established models in the time and frequency domains.

URLhttp://dx.doi.org/10.1109/TCSI.2007.904686
DOI10.1109/TCSI.2007.904686

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