A high-efficiency resonant switched capacitor converter with continuous conversion ratio

Alon Cervera, Michael Evzelman, Mor Mordechai Peretz, Shmuel Sam Ben-Yaakov

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

A resonant switched capacitor converter with high efficiency over a wide and continuous conversion ratio range is introduced. The efficiency of the topology depends primarily on the conduction losses and is decoupled, to a large extent, from the voltage conversion ratio. This is an advantage over classical switched capacitor converters, for which the efficiency is strongly related to the conversion ratio. The operation principle applies three zero current switching states to charge, discharge, and balance the remaining charge of the flying capacitor. This results in a gyrator, i.e., a voltage-dependent current source, with a wide range of voltage conversion ratios (smaller as well as greater than unity) as well as bidirectional power flow capabilities. The analytical expressions for the conversion ratio and expected efficiency are provided and validated through simulations and experiments. The experimental verifications of the converter demonstrate peak efficiency of 96% and above 90% efficiency over a wide range of voltage gains and loading conditions. In addition, the system was found to be highly efficient at the extreme cases of both light and heavy loads.

Original languageEnglish
Article number6799211
Pages (from-to)1373-1382
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume30
Issue number3
DOIs
StatePublished - 1 Mar 2015

Keywords

  • current control
  • digital control
  • gyrators
  • pulse modulation
  • switched capacitor circuits
  • switched mode power supplies

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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