US Patent No. 11,116,058

LED DIMMING CONTROL CIRCUIT, DIMMING CONTROL METHOD AND LED POWER SYSTEM THEREOF


Patent No. 11,116,058
Issue Date September 07, 2021
Title Led Dimming Control Circuit, Dimming Control Method And Led Power System Thereof
Inventorship Longqi Wang, Hangzhou (CN)
Assignee Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)

Claim of US Patent No. 11,116,058


1. A light-emitting diode (LED) dimming control circuit, comprising:a) a detection circuit configured to receive a dimming control signal, and to generate a detection signal for characterizing a type of the dimming control signal by detecting a number of rising or falling edges of the dimming control signal within a period of time by counting transitions of a clock signal that is generated by comparing the diming control signal against a reference voltage;
b) a dimming signal generation circuit configured to generate a dimming signal according to the detection signal and the dimming control signal, wherein a duty cycle of the dimming signal corresponds to the dimming control signal; and
c) a first conversion circuit configured to compare the dimming control signal against a triangular wave signal to generate a comparison result that is high when the triangular wave signal is greater than the dimming control signal.