A family of exponential step-down switched-capacitor converters and their applications in two-stage converters

Song Xiong, Siu Chung Wong, Siew Chong Tan, Chi Kong Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)


This paper presents a family of exponential voltage step-down switched-capacitor (ESC) converters. Considering the demand of large-voltage-gain step-down converters in the market, it is difficult to achieve the step-down requirement with good efficiency for a single-stage buck converter. The two-stage converter has been an effective solution for high-voltage-step-down applications. In this paper, making use of the large-voltage-gain conversion property of the ESC converter, a two-stage ESC-buck converter is proposed. A mathematical tool for the accurate calculation of efficiency is developed. The efficiency characteristic of the proposed ESC converter is established. Experimental efficiency measurements are carried out using the ESC converter proposed and two different types of commercially available buck converter ICs. The results show that the efficiency of the ESC-buck converter is higher than that of a single buck converter for large-voltage-gain applications.
Original languageEnglish
Article number6544691
Pages (from-to)1870-1880
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number4
Publication statusPublished - 1 Jan 2014


  • Exponential step-down switch-capacitor converter
  • large-voltage-gain-two-stage converter
  • switched capacitor converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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