An Optimized Sensorless Synchronous Rectification Method for LLC Resonant Converter in Wide Output Voltage Range

Won Yong Jang, Issac Kim, Jihyeon Yun, Jung Wook Park

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

3 Citations (Scopus)

Abstract

In LLC resonant converters, synchronous rectification (SR), which replaces the secondary side diodes with metal-oxide-semiconductor field-effect transistors, is mainly mentioned to improve further efficiency. Among SR methods, the sensorless method has gained significant attention because it does not require additional circuits, which can maintain the cost and power density of system. However, conventional sensorless methods cannot achieve high efficiency in wide output voltage range due to their model inaccuracy. Also, these methods might cause an early turn-ON of SR in the step-down area, resulting in the circulating current that reduces efficiency and stability. To solve these problems, the proposed SR method is newly proposed by using the time-domain analysis method, which obtains high SR accuracy in wide output voltage range. Moreover, it can prevent the circulating current by introducing the accurate turn-ON timing of SR. First, the overall process descriptions and SR strategies of LLC resonant converter are described. After that, the proposed SR method is mathematically expressed by the time-domain analysis method. Finally, its effectiveness is evaluated by the simulation test.

Original languageEnglish
Title of host publication2024 IEEE Applied Power Electronics Conference and Exposition, APEC 2024
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2691-2696
Number of pages6
ISBN (Electronic)9798350316643
DOIs
Publication statusPublished - 2024
Event39th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2024 - Long Beach, United States
Duration: 2024 Feb 252024 Feb 29

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
ISSN (Print)1048-2334

Conference

Conference39th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2024
Country/TerritoryUnited States
CityLong Beach
Period24/2/2524/2/29

Bibliographical note

Publisher Copyright:
© 2024 IEEE.

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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