Quasi-resonant flyback converter with new valley voltage detection mechanism

Wei Chia Wu, Tsorng Juu Liang, Kai Hui Chen, Cheng Yuan Li

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

1 Citation (Scopus)

Abstract

In quasi-resonant (QR) controller, sensing the current of the power switch and using a delay time are commonly used to achieve valley-voltage-switching. However, the accuracy of valley-voltage switching instant in both methods are affected by the components variations during manufacturing. A primary-side QR-control IC for flyback converter with a novel valley detector is proposed to solve this problem. By sensing the auxiliary winding voltage, the controller estimates the quarter of the resonant period. And the time which the voltage across the power switch decreasing to valley is estimated accurately. Additionally, the primary-side control is adopted to reduce the size and cost of circuit. Finally, this controller is fabricated with TSMC 0.25 μm CMOS high voltage mixed-signal general purpose process, and applied to an input voltage of 90-264 Vrms, output voltage of 12 V, and output power of 30 W flyback converter to verify the feasibility of proposed control.

Original languageEnglish
Title of host publicationAPEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages767-770
Number of pages4
ISBN (Electronic)9781538611807
DOIs
Publication statusPublished - 2018 Apr 18
Event33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018 - San Antonio, United States
Duration: 2018 Mar 42018 Mar 8

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2018-March

Other

Other33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
CountryUnited States
CitySan Antonio
Period18-03-0418-03-08

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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  • Cite this

    Wu, W. C., Liang, T. J., Chen, K. H., & Li, C. Y. (2018). Quasi-resonant flyback converter with new valley voltage detection mechanism. In APEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition (pp. 767-770). (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; Vol. 2018-March). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2018.8341098