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

Santanu Kapat, Philip T. Krein

Research output: Contribution to journalArticlepeer-review


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 languageEnglish (US)
Article number5970122
Pages (from-to)1444-1454
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number3
StatePublished - 2012


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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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