US 11,750,083 B2
Overvoltage protection circuit, integrated circuit and switching converter with the same
Dengke Chen, Hangzhou (CN); and Hongfeng Fan, Hangzhou (CN)
Assigned to Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed by Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed on Feb. 2, 2022, as Appl. No. 17/591,081.
Application 17/591,081 is a continuation of application No. 16/007,554, filed on Jun. 13, 2018, granted, now 11,277,064.
Claims priority of application No. 201710471550.5 (CN), filed on Jun. 20, 2017.
Prior Publication US 2022/0158542 A1, May 19, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/156 (2006.01); H02M 1/32 (2007.01); H02H 1/00 (2006.01); H02M 1/36 (2007.01); H02M 1/08 (2006.01)
CPC H02M 1/32 (2013.01) [H02H 1/0007 (2013.01); H02M 1/36 (2013.01); H02M 3/156 (2013.01); H02M 1/08 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An overvoltage protection circuit configured to prevent an overvoltage of an output voltage of a switching converter, the overvoltage protection circuit comprising:
a) an output voltage simulation circuit configured to generate an output voltage simulation signal according to circuit parameters of said switching converter, wherein said output voltage simulation signal changes along with and represents said output voltage without being generated using said output voltage; and
b) an overvoltage signal generator configured to activate an overvoltage signal when a feedback voltage is less than a first threshold value and said output voltage simulation signal is greater than a second threshold value, wherein said feedback voltage is generated by sampling said output voltage.