A Merged-Two-Stage LEGO-PoL Converter with Coupled Inductors for Vertical Power Delivery

Youssef Elasser, Jaeil Baek, Minjie Chen

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

Abstract

This paper presents a merged-two-stage hybrid-switched-capacitor converter featuring the Linearly Extendable Group Operated Point-of-Load (LEGO-PoL) architecture with coupled inductor-enabled vertical power delivery for ultra-high-current microprocessors. By merging a switched-capacitor stage with a multiphase buck converter stage, the proposed converter achieves reduced device stress, minimized magnetics size, and soft charging. A systematic way of designing coupled inductors in multiphase buck converters, based on an inductance dual model which links the geometry of the magnetic core to a lumped circuit model, is introduced. Coupled inductors in the multiphase buck stage reduce the steady-state per-phase current ripple and improve the transient performance of the system. By delivering power vertically from the motherboard to microprocessors, a high current and power density prototype is designed to minimize the parasitic resistance and enable fast transient with low output current ripple. A 48 V to 1.5 V LEGO-PoL converter rated to deliver 750 A of output current with 100 A/cm2 current area density and 1125 W with 1725 W/in3 power density is designed and simulated with customized four-phase coupled inductors.

Original languageEnglish (US)
Title of host publicationECCE 2020 - IEEE Energy Conversion Congress and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages916-923
Number of pages8
ISBN (Electronic)9781728158266
DOIs
StatePublished - Oct 11 2020
Event12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States
Duration: Oct 11 2020Oct 15 2020

Publication series

NameECCE 2020 - IEEE Energy Conversion Congress and Exposition

Conference

Conference12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
Country/TerritoryUnited States
CityVirtual, Detroit
Period10/11/2010/15/20

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Control and Optimization
  • Energy Engineering and Power Technology

Keywords

  • coupled inductor.
  • hybrid converter
  • Merged-two-stage
  • point-of-load converter
  • switched-capacitor

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