Realization of parasitics in state-space average-value modeling of PWM DC-DC converters

TitleRealization of parasitics in state-space average-value modeling of PWM DC-DC converters
Publication TypeJournal Article
Year of Publication2006
AuthorsDavoudi, A., and J. Jatskevich
JournalPower Electronics, IEEE Transactions on
Pagination1142 - 1147
Date Publishedjul.
KeywordsDC-DC power convertors, nonlinear waveforms, numerical analysis, piecewise linear waveforms, pulsewidth converters, PWM DC-DC converters, PWM power convertors, state-space average-value modeling

Analytical average-value modeling of pulsewidth modulation dc-dc converters is usually based on the piece-wise linear waveforms of the circuit variables and neglects the parasitics that give rise to waveform nonlinearities and complicate model derivation. This letter presents a straightforward but powerful methodology that considers the true averaging of nonlinear waveforms and produces a fairly accurate large-signal transient model that is functional in both operational modes. Based on the proposed modeling approach, a fast procedure for extracting the small-signal frequency-domain characteristics is set forth. The key model parameters are established numerically using the detailed simulation, which streamlines the analysis. The resulting average-value model is validated with a hardware prototype, a detailed simulation, and several previously established models in time and frequency domains.


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