Selection of a curved switching surface for buck converters
- 1 July 2006
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 21 (4), 1148-1153
- https://doi.org/10.1109/tpel.2006.879049
Abstract
A general procedure for the selection of a curved switching surface (SS) to control buck-type converters is presented in this letter. The analysis is based on the normalized representation of ideal SSs for different loading conditions. The normalization process leads to a unique representation of the SSs for any possible buck converter. A set of graphics in three dimensions is introduced to give a spatial sense of the behavior of the converter and its control requirements during transients. As a result of the investigation, a switching surface referred to in this letter as the natural unloaded SS is selected, providing excellent transient behavior and no overshoot during startup. For any buck converter with typical parameters, this control scheme produces, in one switching action, a minimum of 99% of the desired output voltage. The general concept of using second-order SS is also geometrically analyzed in this letter to clarify its characteristic features and disadvantages. Experimental results for a typical buck converter are presented to illustrate the transient behavior of the converter during startup and sudden load changes. The results confirm the virtues of the control scheme.Keywords
This publication has 5 references indexed in Scilit:
- A Comparative Study of the Boundary Control of Buck Converters Using First- and Second-Order Switching Surfaces -Part II: Discontinuous Conduction ModePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- A Novel Fuel Cell SimulatorPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- A Comparative Study of the Boundary Control of Buck Converters Using First- and Second-Order Switching Surfaces -Part I: Continuous Conduction ModePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Derivation of a Second-Order Switching Surface in the Boundary Control of Buck ConvertersIEEE Power Electronics Letters, 2004
- Sliding motions in bilinear switched networksIEEE Transactions on Circuits and Systems, 1987