On energy efficiency of switched-capacitor converters

Chun Kit Cheung, Siew Chong Tan, Chi Kong Tse, Adrian Ioinovici

Research output: Journal article publicationJournal articleAcademic researchpeer-review

94 Citations (Scopus)

Abstract

The energy-efficiency issue of switched-capacitor converters is still a controversial topic that requires a more in-depth discussion. In this paper, we address the issue by dividing the analysis of the entire efficiency problem into two parts. In the first part, the efficiency of a capacitor-charging RC circuit under different aspects (partial charging, full charging, at zero capacitor voltage, at nonzero capacitor voltage, etc.) will be conducted. The efficiency analysis of a capacitor-discharging RC circuit with a resistor, capacitor, and paralleled resistor-capacitor loads will be covered. A complete evaluation of the overall efficiency is then performed in terms of both the charging and discharging efficiencies. Based on the analysis, some design rules useful for developing high-efficiency switched-capacitor converters is suggested. Additionally, it is shown that the belief that quasi-switched-capacitor converters are more lossy than switched-capacitor converters is a common misconception.
Original languageEnglish
Article number6218201
Pages (from-to)862-876
Number of pages15
JournalIEEE Transactions on Power Electronics
Volume28
Issue number2
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Charging efficiency
  • discharging efficiency
  • flying capacitor
  • full charging
  • full discharging
  • partial charging
  • partial discharging
  • quasi-switched-capacitor (QSC) converter
  • switched-capacitor (SC) converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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