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Soft-switching Characteristics Analysis Based on LLC Resonant Converter

  • School of Electrical Engineering and Automation, Harbin Institute of Technology

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In fundamental harmonic approximation (FHA) method, it is assumed that converter operates at resonant frequency. When converter is operating below the resonant frequency, traditional FHA method is not accurate to obtain an adequate inductor to let system operate in zero-voltage-switching (ZVS) mode. This paper proposes a novel method to analyze the value of magnetic current from the perspective of energy conversion. Compared with FHA method, the novel analysis method is practical to get an adequate value of magnetic inductor. It reduces reactive power loss and turn-off loss of LLC resonant converter. The method ensures that converter can get soft-switching characteristics at full range of load and the efficiency of converter is improved at the same time. Finally, a 300W 500kHz 400V/24V half-bridge LLC resonant converter is built to verify the validity of method.

Original languageEnglish
Title of host publicationITEC Asia-Pacific 2018 - 2018 IEEE Transportation Electrification Conference and Expo, Asia-Pacific
Subtitle of host publicationE-Mobility: A Journey from Now and Beyond
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538657829
DOIs
StatePublished - 10 Aug 2018
Externally publishedYes
Event2018 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2018 - Bangkok, Thailand
Duration: 6 Jun 20189 Jun 2018

Publication series

NameITEC Asia-Pacific 2018 - 2018 IEEE Transportation Electrification Conference and Expo, Asia-Pacific: E-Mobility: A Journey from Now and Beyond

Conference

Conference2018 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2018
Country/TerritoryThailand
CityBangkok
Period6/06/189/06/18

Keywords

  • FHA method
  • LLC resonant converter
  • efficiency
  • magnetic inductor
  • soft-switching characteristics

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