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Improved Time Optimal Control of a Buck Converter Based on Capacitor Current

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2 Author(s)
Kapat, S. ; Dept. of Electr. Eng., Indian Inst. of Technol. Kharagpur, Kharagpur, India ; Krein, P.T.

Time optimal control (TOC) is a technique to provide fast transient recovery in dc-dc converters. Prior published approaches are incomplete in the formulation of TOC because they ignore voltage-deviation effects on inductor-current and load-current dynamics during a large-signal recovery. An accurate TOC algorithm based on capacitor current is presented. This method achieves minimum transient recovery time for load transients and tracking in a buck converter. The minimum recovery time is preserved even with a transient-detection delay. This control configuration ensures large-signal stability in a sense similar to that of sliding-mode control. The results are demonstrated in an experimental buck converter that uses a digital control algorithm.

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Power Electronics, IEEE Transactions on  (Volume:27 ,  Issue: 3 )