Investigation of Adaptive Synchronous Rectifier (SR) Driving Scheme for LLC/CLLC Resonant Converter in EV On-Board Chargers

Zhengda Zhang, Chunhui Liu, Yunpeng Si, Yifu Liu, Qin Lei

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

Abstract

For LLC/CLLC resonant converters, synchronous rectifiers (SR) are desired to be turned off at the current zerocrossing moment to avoid the additional conduction loss and the circulation current. In this paper, an adaptive SR driving scheme is proposed for LLC/CLLC resonant converter, which guarantees the ZCS turn-off of the SRs and improves the system efficiency. The proposed method senses the drain-to-source voltage of only one switch, which makes it easy to implement. Meanwhile, a simple drain-to-source voltage sensing circuit is proposed. The proposed circuit can be directly interfaced with the digital controller without any signal conditioning circuit. Moreover, external RC circuits are employed to compensate the turnon moment discrepancy between the SR and its corresponding primary side switch. A 6.6 kW/500 kHz CLLC resonant converter prototype is built, which is used as the isolated dc-dc stage for an EV on-board charger. The proposed adaptive driving scheme is validated by experimental tests.

Original languageEnglish (US)
Title of host publicationAPEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2185-2191
Number of pages7
ISBN (Electronic)9781728148298
DOIs
StatePublished - Mar 2020
Externally publishedYes
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

Keywords

  • EV on-board charger
  • Synchronous rectification
  • WBG devices
  • high frequency
  • high power density
  • resonant converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Zhang, Z., Liu, C., Si, Y., Liu, Y., & Lei, Q. (2020). Investigation of Adaptive Synchronous Rectifier (SR) Driving Scheme for LLC/CLLC Resonant Converter in EV On-Board Chargers. In APEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition (pp. 2185-2191). [9124270] (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/APEC39645.2020.9124270