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Published November 1995 | public
Journal Article Open

One-cycle control of switching converters


A new large-signal nonlinear control technique is proposed to control the duty-ratio d of a switch such that in each cycle the average value of a switched variable of the switching converter is exactly equal to or proportional to the control reference in the steady-state or in a transient. One-cycle control rejects power source perturbations in one switching cycle; the average value of the switched variable follows the dynamic reference in one switching cycle; and the controller corrects switching errors in one switching cycle. There is no steady-state error nor dynamic error between the control reference and the average value of the switched variable. Experiments with a constant frequency buck converter have demonstrated the robustness of the control method and verified the theoretical predictions. This new control method is very general and applicable to all types of pulse-width-modulated, resonant-based, or soft-switched switching converters for either voltage or current control in continuous or discontinuous conduction mode. Furthermore, it can be used to control any physical variable or abstract signal that is in the form of a switched variable or can be converted to the form of a switched variable.

Additional Information

© Copyright 1995 IEEE. Reprinted with permission. Manuscript received September 22, 1993; revised June 13, 1995. The authors acknowledge Prof. R.D. Middlebrook and Dr. Dragan Maksimović for many valuable discussions. Credit is due to Dr. Milivojo Brković and Dr. Narayana Sateesh Pillai for their assistance in the experimental work. The authors also wish to thank Dr. H.R. Visser and Dr. Andre Veltman for bringing the ASDTIC control papers to our attention at PESC 91.


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