Numerical state-space average-value modeling of PWM DC-DC converters operating in DCM and CCM

TitleNumerical state-space average-value modeling of PWM DC-DC converters operating in DCM and CCM
Publication TypeJournal Article
Year of Publication2006
AuthorsDavoudi, A., J. Jatskevich, and T. De Rybel
JournalPower Electronics, IEEE Transactions on
Pagination1003 - 1012
Date Publishedjul.
KeywordsCCM, continuous mode, DC-DC power convertors, DCM, discontinuous mode, duty-ratio constraint, large-signal time-domain transients, nonlinear functions, numerical analysis, parasitic effects, pulsewidth modulation converters, PWM DC-DC converters, PWM power convertors, small-signal frequency-domain, state-space average-value modeling, state-space methods

State-space average-value modeling of pulsewidth modulation converters in continuous and discontinuous modes has received significant attention in the literature, and various models have been developed. This paper presents a new approach for generating the state-space average-value model. In the proposed methodology, the so-called duty-ratio constraint and the correction term are extracted numerically using the detailed simulation and are expressed as nonlinear functions of the duty cycle and average-value of the fast state variable. The parasitic effects of circuit elements are readily included. The resulting average-value model is compared to a hardware prototype, a detailed simulation, and several previously published models. The proposed model is shown to be very accurate in predicting the large-signal time-domain transients as well as the small-signal frequency-domain characteristics.


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