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access icon free Quasi-steady-state large-signal modelling of DC–DC switching converter: justification and application for varying operating conditions

Quasi-steady-state (QSS) large-signal models are often taken for granted in the analysis and design of DC–DC switching converters, particularly for varying operating conditions. In this study, the premise for the QSS is justified quantitatively for the first time. Based on the QSS, the DC–DC switching converter under varying operating conditions is reduced to the linear time varying systems model. Thereafter, the QSS concept is applied to analysis of frequency-domain properties of the DC–DC switching converters by using three-dimensional Bode plots, which is then utilised to the optimisation of the controller parameters for wide variations of input voltage and load resistance. An experimental prototype of an average-current-mode-controlled boost DC–DC converter is built to verify the analysis and design by both frequency-domain and time-domain measurements.

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2013.0487
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