A GaN-based 97% efficient hybrid switched-capacitor converter with lossless regulation capability

Yutian Lei, Zichao Ye, Robert Carl Nikolai Pilawa Podgurski

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

Abstract

DC-DC converters for large conversion ratio applications face challenges such as high device stress and large inductor size. Switched-capacitor (SC) converters are known to have reduced device stress and no inductors, but the associated large transient current and poor efficiency at regulated output have prevented their wide adoptions. In this work, a complete solution is proposed, including the control and design considerations for a magnetic hybrid type of SC converter, so that the capacitor charging loss is eliminated and high efficiency is maintained with voltage regulation. Compared to conventional buck converters, the proposed converter offers the advantages of higher efficiency and significantly reduced inductor size. A 170 V to 24 V, 70 W prototype with a wide input and output voltage operating range is implemented using GaN transistors. A low profile heat-sink is designed and built by 3D printing to sufficiently cool the converter. A peak efficiency of 97% and a power density of 276 W/in3 are achieved, which compare favorably to both conventional SC converters and buck converters.

Original languageEnglish (US)
Title of host publication2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages4264-4270
Number of pages7
ISBN (Electronic)9781467371506
DOIs
StatePublished - Oct 27 2015
Event7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015 - Montreal, Canada
Duration: Sep 20 2015Sep 24 2015

Publication series

Name2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015

Other

Other7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015
CountryCanada
CityMontreal
Period9/20/159/24/15

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Lei, Y., Ye, Z., & Pilawa Podgurski, R. C. N. (2015). A GaN-based 97% efficient hybrid switched-capacitor converter with lossless regulation capability. In 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 (pp. 4264-4270). [7310262] (2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2015.7310262