A switched-capacitor power converter with unequal duty cycle for ripple reduction and efficiency improvement

Yulun Wu, Yerzhan Mustafa, Yan Lu, Alex Ruderman, Rui P. Martins

Research output: Contribution to journalArticlepeer-review

Abstract

This work applies unequal duty cycle to switched-capacitor (SC) dc-dc converters to improve its output ripple as well as the power conversion efficiency. By adjusting the duty cycle, the capacitor charge and discharge states are reasonably balanced. Therefore, we effectively reduce the output ripple and the charge redistribution loss, improving the efficiency. A SC converter verifies this scheme with voltage conversion ratios (VCRs) of 1/4 and 1/3, in a 65 ​nm CMOS low-power process. Operating with a switching frequency of 33 ​MHz, an input voltage of 2.4 ​V, an output range of 0.5–25 ​mA, and a VCR of 1/4, the peak efficiency increases by 1.0% and the output ripple drops by 43.6%, when compared with the equal duty cycle mode. With the input voltage equal to 1.8 ​V and the VCR ​= ​1/3, the peak efficiency increases by 0.7% and the output ripple reduces by 48.0%, compared to the equal duty cycle mode.

Original languageEnglish
Article number104888
JournalMicroelectronics Journal
Volume104
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Power integrated circuits
  • Ripple reduction
  • Switched mode power supplies
  • Unequal duty cycle

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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