Primary-side feedback control IC design for flyback converter with energy saving burst mode

Chun Yu Huang, Tsorng Juu Liang, Kai Hui Chen, Cheng Yuan Li

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

1 Citation (Scopus)

Abstract

The advantages of the flyback converter with the primary-side regulation (PSR) are small size and high efficiency at light load. However, when the PSR flyback converter operates in burst mode, the controller is not able to sense the output information. Therefore, it is not easy to control the output voltage precisely. An integrated circuit design for AC-DC flyback converter using primary-side controller with burst mode energy saving is proposed in this paper. As the load decreases, the flyback converter operates from discontinuous conduction mode to frequency reduction mode. At extremely light load, the flyback converter operates in burst mode. With the proposed control, the burst-on time is detected by the voltage across the auxiliary winding, and the burst-off time can be estimated to control the output voltage ripple. In the proposed control circuit, a capacitor is charged by a constant current source during the burst-on time, and the capacitor voltage is transferred to a controlled current. Therefore, the required burst-off time can be obtained by using the controlled current to charge another capacitor until it reaches the reference voltage. Finally, this controller is fabricated with TSMC 0.25 μm CMOS high voltage mixed signal general purpose process. The flyback converter with the input voltage range of 90-130 Vrms, the output voltage of 15 V, and the output power of 30 W is implemented to verify the feasibility of the proposed controller.

Original languageEnglish
Title of host publicationAPEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2054-2061
Number of pages8
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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    Huang, C. Y., Liang, T. J., Chen, K. H., & Li, C. Y. (2018). Primary-side feedback control IC design for flyback converter with energy saving burst mode. In APEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition (pp. 2054-2061). (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.2018.8341300