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Synchronous Rectification for LLC Resonant Converter: An Overview

  • Yuqi Wei
  • , Quanming Luo
  • , H. Alan Mantooth
  • University of Arkansas, Fayetteville
  • Chongqing University

Research output: Contribution to journalReview articlepeer-review

92 Scopus citations

Abstract

LLC resonant converter is one of the most popular isolated dc/dc converters owning to its advantages of simple control, wide voltage gain regulation capability, and soft switching operation. Nevertheless, high efficiency and high power density are always the goals for LLC converters. To further increase the conversion efficiency, the synchronous rectification (SR) technology is adopted, where the uncontrolled diodes on the secondary side are replaced with SR MOSFETs. Due to the extreme low on-state resistance value for SR MOSFET, considerable secondary rectifier conduction loss reduction can be achieved; thus, the system efficiency is improved. Tremendous SR driving strategies for LLC converter have been proposed. However, comprehensive overview and insight comparisons among these different driving strategies are lacking.

Original languageEnglish
Article number9271916
Pages (from-to)7264-7280
Number of pages17
JournalIEEE Transactions on Power Electronics
Volume36
Issue number6
DOIs
StatePublished - Jun 2021
Externally publishedYes

Keywords

  • LLC converter
  • overview
  • rectification
  • synchronous

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