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Title: Small signal modeling of DC-DC power converters based on separation of variables
Keywords: small signal model, fast variables, slow variables, separation, dc-dc, and power converter
Issue Date: 8-Mar-2004
Citation: NG POH KEONG (2004-03-08). Small signal modeling of DC-DC power converters based on separation of variables. ScholarBank@NUS Repository.
Abstract: The proposed separation of variables method (SVM) is developed intuitively based on the assumption that a converter circuit can be separated into a fast and a slow sub-circuits under small signal behavior. The SVM assumes the fast sub-circuit reacts instantaneously to perturbations, while the slow sub-circuit reacts very slowly. The latter are typically associated with large dynamical elements and to be replaced by constants sources. A small signal behavior of the converter, whose model parameters are constants, is obtained through perturbing the constant sources. The model parameters allows a small signal equivalent circuit to be constructed. Therefore its frequency responses can be obtained either through circuit simulation or analytical approaches. The SVM method is applied to hard-switched converters, soft-switched converters, and series resonant converters. Two SVM modifications are proposed for a??not so fasta?? fast variables. Model predictions are verified either through PSPICE simulation or analytically.
Appears in Collections:Master's Theses (Open)

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