US 12,237,666 B2
Systems and methods of overvoltage protection for LED lighting
Zhuoyan Li, Shanghai (CN); Liqiang Zhu, Shanghai (CN); Jiqing Yang, Shanghai (CN); and Lieyi Fang, Shanghai (CN)
Assigned to On-Bright Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD., Shanghai (CN)
Filed on Oct. 19, 2020, as Appl. No. 17/074,523.
Application 17/074,523 is a continuation of application No. 16/161,527, filed on Oct. 16, 2018, granted, now 10,873,263.
Application 16/161,527 is a continuation of application No. 15/235,046, filed on Aug. 11, 2016, granted, now 10,212,783, issued on Feb. 19, 2019.
Application 15/235,046 is a continuation of application No. 15/140,347, filed on Apr. 27, 2016, granted, now 9,780,672, issued on Oct. 3, 2017.
Claims priority of application No. 201610190128.8 (CN), filed on Mar. 29, 2016.
Prior Publication US 2021/0104949 A1, Apr. 8, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H02H 7/12 (2006.01); H02H 1/00 (2006.01); H02H 3/20 (2006.01); H05B 45/3725 (2020.01); H05B 47/24 (2020.01); G05F 1/571 (2006.01); H02M 3/156 (2006.01); H02M 3/335 (2006.01)
CPC H02H 7/1213 (2013.01) [H02H 1/0007 (2013.01); H02H 3/202 (2013.01); H05B 45/3725 (2020.01); H05B 47/24 (2020.01); G05F 1/571 (2013.01); H02M 3/156 (2013.01); H02M 3/33515 (2013.01); Y02B 20/30 (2013.01)] 15 Claims
OG exemplary drawing
 
14. A method for a power converter, the method comprising:
generating a modulation signal;
receiving the modulation signal;
generating a drive signal based at least in part on the modulation signal, the drive signal being associated with a terminal voltage at a winding terminal of an inductive winding of the power converter;
receiving a feedback signal and a demagnetization signal, the feedback signal being equal to the terminal voltage divided by a predetermined constant;
generating a detection signal based at least in part on the feedback signal and the demagnetization signal;
outputting the detection signal, the detection signal indicating whether an overvoltage protection is triggered; and
in response to the detection signal indicating the overvoltage protection is triggered, causing the power converter to shut down;
wherein:
the demagnetization signal indicates a beginning and an end of a demagnetization period for the inductive winding;
at the beginning of the demagnetization period, the demagnetization signal changes from a first logic level to a second logic level;
at the end of the demagnetization period, the demagnetization signal changes from the second logic level to the first logic level; and
the first logic level and the second logic level are different;
wherein the generating a detection signal based at least in part on the feedback signal and the demagnetization signal includes:
generating a sampled-and-held signal based at least in part on the feedback signal;
wherein the generating a detection signal based at least in part on the feedback signal and the demagnetization signal further includes:
receiving the sampled-and-held signal;
generating a first current signal based at least in part on the sampled-and-held signal;
receiving a first threshold signal;
generating a second current signal based at least in part on the first threshold signal;
receiving the first current signal and the second current signal;
generating a third current signal based at least in part on the first current signal and the second current signal;
receiving the third current signal;
generating a second voltage signal based at least in part on the third current signal;
receiving the second voltage signal, a second threshold signal and the demagnetization signal; and
generating the detection signal based at least in part on the second voltage signal, the second threshold signal, and the demagnetization signal.