Improved time optimal control of a buck converter based on capacitor current

Santanu Kapat; Philip T. Krein

doi:10.1109/TPEL.2011.2163419

Improved time optimal control of a buck converter based on capacitor current

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Abstract

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.

Original language	English (US)
Article number	5970122
Pages (from-to)	1444-1454
Number of pages	11
Journal	IEEE Transactions on Power Electronics
Volume	27
Issue number	3
DOIs	https://doi.org/10.1109/TPEL.2011.2163419
State	Published - 2012

Keywords

Buck converter
capacitor current
characteristic impedance
hybrid control
time optimal control (TOC)

ASJC Scopus subject areas

Electrical and Electronic Engineering

Online availability

10.1109/TPEL.2011.2163419

Library availability

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abstract = "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.",

keywords = "Buck converter, capacitor current, characteristic impedance, hybrid control, time optimal control (TOC)",

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note = "Funding Information: Manuscript received January 23, 2011; revised May 25, 2011; accepted July 14, 2011. Date of current version February 7, 2012. This work was supported by the Grainger Center for Electric Machinery and Electromechanics, the University of Illinois at Urbana-Champaign, Urbana. Recommended for publication by Associate Editor C. K. Tse.",

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Improved time optimal control of a buck converter based on capacitor current

Abstract

Keywords

ASJC Scopus subject areas

Online availability

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