A new small-signal model is developed for pulse-width-modulated converters operating with current-mode control. Four different control schemes are analyzed, all of which use the instantaneous value of the inductor current as part of the control modulation. Continuous-conduction mode and discontinuous-conduction mode models are provided.
Sampled-data modeling is applied to the current-mode cell which is common to all converters, and the important results obtained are simplified to give a powerful model for analysis and design. The new model explains all of the observed phenomena of current-mode control, including the subharmonic oscillation which can occur with constant-frequency modulation. It is shown that the model provides transfer functions with three poles for two-state converters. Predictions of the new model are accurate to half the switching frequency. / Ph. D.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/38935 |
| Date | 28 July 2008 |
| Creators | Ridley, Raymond B. |
| Contributors | Electrical Engineering, Lee, Fred C., Vorperian, Vatche, Cho, Bo H., Chen, Dan Y., Nelson, Douglas J. |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Dissertation, Text |
| Format | xii, 197 leaves, BTD, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 23716378, LD5655.V856_1990.R546.pdf |
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