US 11,955,895 B2
Primary-side controller for hybrid secondary-side regulation
Yong Li, Campbell, CA (US); Cong Zheng, Campbell, CA (US); Xiaoyan Wang, Campbell, CA (US); and Wenduo Liu, Campbell, CA (US)
Assigned to DIALOG SEMICONDUCTOR INC., Campbell, CA (US)
Filed by DIALOG SEMICONDUCTOR INC., Campbell, CA (US)
Filed on Jan. 18, 2022, as Appl. No. 17/578,353.
Application 17/578,353 is a division of application No. 17/109,006, filed on Dec. 1, 2020, abandoned.
Application 17/109,006 is a division of application No. 16/588,854, filed on Sep. 30, 2019, granted, now 10,855,188, issued on Dec. 1, 2020.
Application 16/588,854 is a division of application No. 16/100,934, filed on Aug. 10, 2018, granted, now 10,461,646, issued on Oct. 29, 2019.
Application 16/100,934 is a continuation of application No. PCT/US2018/013655, filed on Jan. 12, 2018.
Claims priority of provisional application 62/445,660, filed on Jan. 12, 2017.
Prior Publication US 2022/0140735 A1, May 5, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/32 (2007.01); H02M 1/36 (2007.01); H02J 7/00 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33523 (2013.01) [H02M 1/32 (2013.01); H02M 1/36 (2013.01); H02M 3/33507 (2013.01); H02M 3/33592 (2013.01); H02J 7/00 (2013.01); H02M 1/0058 (2021.05); Y02B 70/10 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A primary-side controller for a flyback converter, comprising:
a communication interface for receiving a control voltage from a secondary-side controller for the flyback converter during a steady-state operation following a startup of the flyback converter;
a switch controller configured to cycle a power switch according to secondary-side control only during the steady-state operation responsive to the control voltage to regulate an output voltage of the flyback converter through the secondary-side control; and
a primary-side waveform analyzer configured to sense an auxiliary winding voltage during the startup of the flyback converter to determine a sensed output voltage, wherein the switch controller is further configured to cycle the power switch according to primary-only feedback only during the startup of the flyback converter responsive to the sensed output voltage from the primary-side waveform analyzer to regulate the output voltage of the flyback converter through the primary-only feedback.