LEGO-PoL: A 48V-1.5V 300A Merged-Two-Stage Hybrid Converter for Ultra-High-Current Microprocessors

Jaeil Baek, Ping Wang, Youssef Elasser, Yenan Chen, Shuai Jiang, Minjie Chen

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

Abstract

This paper presents a family of 48 V-1.5 V merged-two-stage hybrid-switched-capacitor converters with a Linear Extendable Group Operated Point-of-Load (LEGO-PoL) architecture for high current microprocessors. The proposed LEGO-PoL converter leverages the advantages of switched-capacitor (SC) circuits and multiphase buck circuits and can achieve soft charging, current sharing, and automatic voltage balancing. The SC circuits are connected in series to split the high input voltage into multiple stacked voltage domains, and the multiphase buck circuits are connected in parallel to split the high output current into multiple parallel current paths. The inductors of the multiphase buck converters are used as current sources to soft-charge and soft-switch the switched-capacitor circuits, and the switched-capacitor circuits are utilized to ensure current sharing among the multiphase buck circuits. The voltage balancing and current sharing mechanisms of the LEGO-PoL architecture are investigated in detail. A 450 W, 48 V-1.5 V, 300 A LEGO-PoL converter with a peak efficiency of 96%, a full load efficiency of 87.7%, and a power density of 577 W/in3 was built and tested to verify the effectiveness of the LEGO-PoL architecture.

Original languageEnglish (US)
Title of host publicationAPEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages490-497
Number of pages8
ISBN (Electronic)9781728148298
DOIs
StatePublished - Mar 2020
Event35th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2020 - New Orleans, United States
Duration: Mar 15 2020Mar 19 2020

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2020-March

Conference

Conference35th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2020
CountryUnited States
CityNew Orleans
Period3/15/203/19/20

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • DC-DC power conversion
  • hybrid switched-capacitor circuit
  • linear extendable group operated (LEGO) architecture
  • point of load (PoL) converter

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  • Cite this

    Baek, J., Wang, P., Elasser, Y., Chen, Y., Jiang, S., & Chen, M. (2020). LEGO-PoL: A 48V-1.5V 300A Merged-Two-Stage Hybrid Converter for Ultra-High-Current Microprocessors. In APEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition (pp. 490-497). [9124564] (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; Vol. 2020-March). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC39645.2020.9124564