LEGO-Boost: A Merged-Two-Stage Resonant-Switched-Capacitor Converter with High Voltage Conversion Ratio

Yenan Chen, Jaeil Baek, Minjie Chen

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

Abstract

This paper presents a family of merged-two-stage resonant-switched-capacitor boost converters with a Linear Extendable Group Operated Boost (LEGO-Boost) architecture. In the LEGO-Boost architecture, multiple resonant voltage doubler units are connected in parallel to interface with a high current input source; multiple switched-capacitor units are connected in series to interface with a high voltage output load. The operation of the resonant voltage doubler units and the switched-capacitor units are merged to create mutual advantages: the resonant voltage doubler units are used as current sources to soft-charge the series stacked switched-capacitor units and maintain voltage balancing; the stacked switched-capacitor units are used to multiply the voltage without charge sharing loss and switching loss (achieving soft-switching and soft-charging). All active switches in the LEGO-Boost architecture are configured as ground referenced half-bridge circuits. It offers advantages of high reliability, high scalability and low cost for applications such as grid-interface photovoltaic and fuel cell systems. The effectiveness of the LEGO-Boost architecture is verified by a 20 V-to-240 V 535 W (1:12 voltage conversion ratio) prototype with 94.2% peak efficiency and over 215 W/in3 power density.

Original languageEnglish (US)
Title of host publicationAPEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages48-55
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

  • fuel cell
  • photovoltaic
  • resonant converter
  • soft-charging
  • soft-switching
  • switched-capacitor converter

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  • Cite this

    Chen, Y., Baek, J., & Chen, M. (2020). LEGO-Boost: A Merged-Two-Stage Resonant-Switched-Capacitor Converter with High Voltage Conversion Ratio. In APEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition (pp. 48-55). [9124570] (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/APEC39645.2020.9124570