Adaptive mixed on-time and switching frequency control of a system of interleaved switched-capacitor converters

Siew Chong Tan, Sitthisak Kiratipongvoot, Svetlana Bronstein, Adrian Ioinovici, Y. M. Lai, Chi Kong Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

79 Citations (Scopus)


The switched-capacitor (SC) converters are ideal switching-mode power supplies for consumer portable electronic devices due to their nature of being light weight, small size, and high-power density. However, they suffer from a discontinuous input-current waveform with large di/dt, which leads to significant electromagnetic interference emission. This paper proposes a configuration of SC converters connected in parallel, with their inputs and outputs interleaved and adaptively controlled. The interleaving operation is performed by using an original type of control in which both the capacitors charging time TONand switching frequency are adjusted to get the line and load regulation. It is shown that, for a given range of variation of the supply voltage and load, there always exists a solution [TON, TS] that assures both output-voltage regulation and perfect interleaving. Experimental results are provided to validate the feasibility of the proposed scheme. Precise interleaving, and good line and load regulation are maintained for all the designated range, including the transient periods.
Original languageEnglish
Article number5518445
Pages (from-to)364-380
Number of pages17
JournalIEEE Transactions on Power Electronics
Issue number2
Publication statusPublished - 17 Feb 2011


  • Adaptive control
  • dc-dc converters
  • electromagnetic interference (EMI)
  • interleaving
  • switched-capacitor (SC) converters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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