Considering Source Dynamics in Computer-Aided Parameteric Average-Value Modeling of PWM Converters

TitleConsidering Source Dynamics in Computer-Aided Parameteric Average-Value Modeling of PWM Converters
Publication TypeConference Paper
Year of Publication2006
AuthorsDavoudi, A., J. Jatskevich, P. L. Chapman, and A. Khaligh
Conference NameComputers in Power Electronics, 2006. COMPEL '06. IEEE Workshops on
Pagination270 -274
Date Publishedjul.
Keywordsaverage-value modeling, computer-aided parameteric modeling, correction matrix, duty-ratio constraint, dynamic impedance, electric impedance, frequency-domain analysis, input source dynamics, large-signal time-domain transients, matrix algebra, nonlinear functions, power engineering computing, PWM converters, PWM power convertors, small-signal frequency-domain characteristics, switching cell, switching convertors, time-domain analysis, transients

Average-value modeling of PWM converters has received significant attention in the literature, wherein the computer-aided methodologies appear to be particularly promising. A numerical procedure has recently been proposed that avoids excessive analytical derivations and results in fairly accurate dynamic average-value models that include effects of parasitics. This methodology is extended here to account for input source dynamics. In particular, the so-called duty-ratio constraint and correction matrix are expressed as nonlinear functions of the duty cycle and the new quantity defined through the averaged dynamic impedance of the switching cell. The resulting model is shown to be accurate in predicting large-signal time-domain transients and small-signal frequency-domain characteristics


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