US 11,903,109 B2
Dimming control method, dimming control circuit and power converter thereof
Hongbin Lai, Hangzhou (CN); and Jianxin Wang, Hangzhou (CN)
Assigned to Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed by Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed on Dec. 23, 2022, as Appl. No. 18/087,931.
Application 18/087,931 is a continuation of application No. 16/940,573, filed on Jul. 28, 2020, granted, now 11,540,373.
Claims priority of application No. 201910733096.5 (CN), filed on Aug. 9, 2019.
Prior Publication US 2023/0131575 A1, Apr. 27, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H05B 45/3725 (2020.01); H05B 45/10 (2020.01); H05B 45/325 (2020.01)
CPC H05B 45/3725 (2020.01) [H05B 45/10 (2020.01); H05B 45/325 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A method of controlling a power convertor to perform diming control for a light-emitting diode (LED) load, the method comprising:
a) adjusting a length of a time interval in which an inductor current remains at zero, in order to adjust a length of a switching period of the power converter in accordance with a first adjustment signal that is correlated to a dimming signal;
b) controlling the power converter to generate a drive current corresponding to the dimming signal; and
c) wherein a duty cycle of the first adjustment signal is greater than a duty cycle of the dimming signal.