A 93.7% efficient 400A 48V-1V merged-two-stage hybrid switched-capacitor converter with 24V virtual intermediate bus and coupled inductors

Yenan Chen, Hsin Cheng, David M. Giuliano, Minjie Chen

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

Abstract

This paper presents a 93.7% efficient 400 A 48 V-1 V merged-two-stage hybrid switched-capacitor converter with 24 V virtual intermediate bus and coupled inductors. The first stage of the converter is a 2:1 interleaved charge pump which converts the 48 V input voltage to a virtual intermediate bus at 24 V. The second stage contains multiple paralleled 24:1 four-phase series capacitor buck modules with coupled inductors which have an equivalent voltage conversion ratio of 6:1. The two stages are linked by a 24 V virtual intermediate bus with small decoupling capacitor and voltage ripple. The hybrid switched capacitor architecture enables high efficiency, high power density, and high control bandwidth for ultra-high-current point-of-load applications. The effectiveness of the topology is verified by a 48 V-1 V 400 A prototype with a peak efficiency of 93.7% at 120 A and a full load efficiency of 88.7% at 400 A. The power density of the prototype is 342 W/in3. Compared to a decoupled-two-stage design, the merged-two-stage design reduces the passive component size at the cost of slightly reduced efficiency.

Original languageEnglish (US)
Title of host publication2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1308-1315
Number of pages8
ISBN (Electronic)9781728189499
DOIs
StatePublished - Jun 14 2021
Event36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021 - Virtual, Online, United States
Duration: Jun 14 2021Jun 17 2021

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Conference

Conference36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Country/TerritoryUnited States
CityVirtual, Online
Period6/14/216/17/21

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • Coupled inductor
  • Point-of-load
  • Soft-charging
  • Soft-switching
  • Switched-capacitor converter
  • Voltage regulator

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