Patent ID: 11903109
Assignee: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. The dimming control circuit of claim 15, wherein the second control circuit comprises:
a) a first ramp circuit configured to generate a first ramp signal with a first slop during the first time interval;
b) a second ramp circuit configured to generate a second ramp signal with a second slop during the first and second time intervals, wherein the second ramp signal is proportional to a duty cycle of the first adjustment signal;
c) a comparison circuit configured to generate a pulse signal when the second ramp signal reaches the first ramp signal; and
d) an AND-gate configured to generate a second control signal in accordance with a clock signal and the pulse signal, in order to adjust the length of the switching period.