High-Conversion Ratio Multi-Phase VRM Realized with Stacking of Generic Series-Capacitor-Buck Converter Cells

Eli Hamo, Michael Evzelman, Mor Mordechai Peretz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper introduces a new design approach for multiphase nonisolated DC-DC topology. The design approach is based on a new generic hybrid cell that consists of both capacitor and inductor. Using a stand-alone cell, the approach contributes to a high modularity of the resulting converters and enables high conversion ratios at higher efficiencies. The unique interaction between the capacitor and the inductor result in a soft charging operation, which curbs the losses of the converter, and contributes to higher efficiency. The method was used to create a multiphase voltage regulator module VRM. The new converter significantly extends the effective duty ratio and lowers the voltage stress of the transistors, while delivering high current to the output and has inherent current sharing to balance the load between the phases. Experimental results of a modular interleaved three phase prototype demonstrate an excellent proof of design methodology concept and agree well with the simulations and theoretical analyses developed in this study. Typical applications are point-of-load (PoL) and voltage regulator modules (VRM).

Original languageEnglish
Title of host publication2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics, COMPEL 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665410816
DOIs
StatePublished - 1 Jan 2022
Event23rd IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2022 - Tel-Aviv, Israel
Duration: 20 Jun 202223 Jun 2022

Publication series

NameProceedings of the IEEE Workshop on Computers in Power Electronics, COMPEL
Volume2022-June
ISSN (Print)1093-5142

Conference

Conference23rd IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2022
Country/TerritoryIsrael
CityTel-Aviv
Period20/06/2223/06/22

Keywords

  • DC-DC power converters
  • Data center
  • high conversion ratio
  • point-of-load converter
  • series capacitor buck converter
  • voltage regulator module

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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