A New Control for Synchronous Rectifier of Phase-Shifted Full-Bridge Converter to Improve Efficiency in Light-Load Condition

Sunho Lee, Jung Wook Park

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This article proposes a new control method for the synchronous rectifier (SR) of phase-shifted full-bridge (PSFB) converter to improve its efficiency in light-load condition. In general, the PSFB converter operates in the discontinuous conduction mode (DCM) in light-load condition to reduce the effective duty-ratio and core loss. However, the conventional control methods in the DCM cause undesirable conduction loss in SR because the output inductor current flows through the body-diode instead of the channel of SR. To figure it out, the proposed control method modulates the turn-on time of SR to eliminate the body-diode conduction. Moreover, it can be easily implemented without any auxiliary circuits. Therefore, it can improve the efficiency in light-load condition while keeping the advantages of DCM. The operating principle of PSFB converter in the DCM is first described. Thereafter, the proposed control method for SR is theoretically analyzed. Finally, its practical effectiveness is verified by experimental tests on the hardware implementation.

Original languageEnglish
Article number9397384
Pages (from-to)3822-3831
Number of pages10
JournalIEEE Transactions on Industry Applications
Issue number4
Publication statusPublished - 2021 Jul 1

Bibliographical note

Funding Information:
Manuscript received October 13, 2020; revised January 26, 2021; accepted March 28, 2021. Date of publication April 6, 2021; date of current version July 16, 2021. Paper 2020-IPCC-1546.R1, presented at the 2019 IEEE Energy Conversion Congress and Exposition, Baltimore, MA, USA, Sep. 29 to Oct. 3, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY by the Electric Machines Committee of the IEEE Industry Applications Society. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT (MSIT), Korea government under Grant 2020R1A3B2079407. (Corresponding author: Jung-Wook Park.) The authors are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail: vpam@yonsei.ac.kr; jungpark@yonsei.ac.kr).

Publisher Copyright:
© 1972-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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