A Switched-Capacitor DC-DC Converter with Unequal Duty Cycle for Ripple Reduction and Efficiency Improvement

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 charge and discharge states of the capacitor are reasonably balanced. Therefore, the output ripple is effectively reduced, and the charge redistribution loss is reduced, improving the efficiency. This scheme is verified with an SC converter with voltage conversion ratios (VCRs) of 1/4 and 1/3, and is simulated in a 65nm low-power process. Operating with a 33MHz switching frequency, an input voltage of 2.4V, an output range of 0.525mA, and a VCR of 1/4, the peak efficiency is increased by 1.0% and the output ripple is reduced by 43.6% compared to the equal duty cycle mode.

Original languageEnglish
Title of host publication2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages43-44
Number of pages2
ISBN (Electronic)9781728151670
DOIs
Publication statusPublished - Nov 2019
Event2nd IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Chengdu, China
Duration: Nov 13 2019Nov 15 2019

Publication series

Name2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings

Conference

Conference2nd IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019
CountryChina
CityChengdu
Period11/13/1911/15/19

Keywords

  • ripple reduction
  • switched-capacitor DC-DC converter
  • switching mode power supply
  • unequal duty cycle

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Hardware and Architecture
  • Signal Processing
  • Electronic, Optical and Magnetic Materials

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  • Cite this

    Wu, Y., Mustafa, Y., Lu, Y., Ruderman, A., & Martins, R. P. (2019). A Switched-Capacitor DC-DC Converter with Unequal Duty Cycle for Ripple Reduction and Efficiency Improvement. In 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings (pp. 43-44). [9012902] (2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICTA48799.2019.9012902