Merged-Two-Stage Resonant and PWM Soft-Charging of Hybrid-Switched-Capacitor DC-DC Converters

Yenan Chen, Jaeil Baek, Minjie Chen

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

Abstract

The efficiency and power density of switched-capacitor dc-dc converters are usually limited by the charge sharing loss of capacitors. In a merged-two-stage hybrid-switched-capacitor design, soft-charging can be achieved by merging a magnetic-based converter with a switched-capacitor-based converter. The magnetic-based converter functions as a current source to charge and discharge the switched capacitors without charge sharing loss. This paper investigates the output impedance of two types of merged-two-stage hybrid-switched-capacitor dc-dc converters with 1) resonant soft-charging, in which the switched-capacitors are soft-charged by sinusoidal current waveforms and 2) PWM soft-charging, in which the switched-capacitors are soft-charged by PWM current waveforms. A few circuit topologies leveraging the merged-two-stage soft charging mechanism are discussed. The effectiveness of the output impedance analysis is verified by SPICE simulations.

Original languageEnglish (US)
Title of host publicationECCE 2020 - IEEE Energy Conversion Congress and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages151-157
Number of pages7
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
CountryUnited 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

  • resonant converter
  • soft-charging
  • soft-switching
  • switched-capacitor converter

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