On Lossless Switched-Capacitor Power Converters

Chi Kong Tse, Siu Chung Wong, M. H L Chow

Research output: Journal article publicationJournal articleAcademic researchpeer-review

116 Citations (Scopus)

Abstract

This paper addresses the desien of efficient switched- capacitor power converters. The discussion starts with a review of the fundamental limitation of switched-capacitor circuits which shows that the topology of such circuits and the “forced” step changes of capacitor voltages are the inherent attributes of power loss. Although the argument follows from a rather trivial result from basic circuit theory, it addresses an important issue on the maximum efficiency achievable in a switched-capacitor converter circuit Based on the observed topological constraint of switched-capacitor converter circuits, the simplest lossless topology for AC/DC conversion is deduced. Also discussed is a simple version of lossless topology that achieves isolation between the source and the load. Finally, an experimental AC/DC switched-capacitor converter, based on the proposed idea, is presented which demonstrates an improved efficiency over other existing switched-capacitor converters. The proposed AC/DC converter contains no inductors and thus is suitable for custom IC implementation for very low power applications.
Original languageEnglish
Pages (from-to)286-291
Number of pages6
JournalIEEE Transactions on Power Electronics
Volume10
Issue number3
DOIs
Publication statusPublished - 1 Jan 1995

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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