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Analysis and design of discrete-sliding mode control for a square-waveform ballast

Osorio, R. and Oliver, M. and Ponce, M. and Pinto-Castillo, S.E. and Juárez, M. and Katebi, M.R. and Grimble, M.J. (2005) Analysis and design of discrete-sliding mode control for a square-waveform ballast. In: 44th IEEE Conference on Decision and Control, 2005 and 2005 European Control Conference. CDC-ECC '05. IEEE, pp. 584-589. ISBN 0-7803-9567-0

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Analysis and design of a dimming control based on the Discrete Sliding Mode Control (DSMC) strategy for electronic ballasts (without resonant tank) is presented. To avoid the acoustic resonance phenomenon, the proposed scheme feeds the lamp with low frequency square waves, and then to stabilize the lamp current a dc-dc converter with a closed loop control stage is included. For this purpose a Buck converter with DSMC control is used. A fast response and good reference pursuit is obtained, avoiding the lamp turn off or the lamp destruction when the dimming control is implemented. A reduction in electronic elements is achieved and the reliability of the overall system is incremented with the DSMC compared to the analog Sliding Mode control strategy. The analysis includes those conditions related to the existence of a sliding surface and the stability conditions. The simulations are made with a nonlinear dynamic lamp model. Analysis, simulation and experimental results of the propose electronic ballast and the control stage are presented.