3D LEGO-PoL: A 93.3% Efficient 48V-1.5V 450A merged-two-stage hybrid switched-capacitor converter with 3D vertical coupled inductors

Jaeil Baek, Youssef Elasser, Minjie Chen

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

Abstract

This paper presents a merged-two-stage hybrid switched-capacitor point-of-load converter with 3D-embedded coupled inductors, vertical power delivery, and LEGO-PoL architecture. By merging a switched-capacitor circuit with a multiphase buck circuit, the 3D LEGO-PoL converter offers reduced device stress and minimized magnetic size, and enables soft switching, soft charging, voltage balancing, and current sharing. A prototype converter with 3D embedded coupled inductors is designed to deliver power vertically from the motherboard to microprocessors with minimized 2D area. A 675 W, 48 V to 1.5 V/450 A hybrid converter with a peak efficiency of 93.3%, full load efficiency of 87.2%, current density of 0.57 A/mm2, and power density of 688 W/in3 was built and tested to verify the effectiveness of the hybrid converter architecture with 3D embedded coupled inductors and vertical power delivery.

Original languageEnglish (US)
Title of host publication2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1321-1327
Number of pages7
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

  • 3D packaging
  • Coupled inductor
  • DC-DC power conversion
  • Hybrid switched-capacitor circuit
  • Merged-two-stage
  • Point of load
  • Vertical power delivery

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