Closed-Loop Design and Transient-Mode Control for a Series-Capacitor Buck Converter

Or Kirshenboim, Timur Vekslender, Mor Mordechai Peretz

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


This paper explores the large-signal and small-signal dynamics of a series-capacitor (SC) buck-type converter and introduces an optimal closed-loop control scheme to accommodate both the steady-state and transient modes. As opposed to a conventional buck converter, where time-optimal control is realized by a single on-off cycle, in the SC-buck topology, there is a need to distribute the switching phases to satisfy the charge balance of the SC. The new control method merges a voltage-mode controller for the steady-state operation and a nonlinear, state-plane based transient-mode controller for load transients. A detailed principle of the operation of the SC-buck converter is provided and explained through an average-behavioral model and state-plane analysis. The operation of the controller is experimentally verified on a 20 W 12 V-to-1 V converter, demonstrating voltage-mode control operation as well as minimum-deviation and time-optimal responses for load transients.

Original languageEnglish
Article number8352026
Pages (from-to)1823-1837
Number of pages15
JournalIEEE Transactions on Power Electronics
Issue number2
StatePublished - 1 Feb 2019


  • DC-DC converters
  • state-space control
  • time-optimal control
  • voltage regulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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