Patent ID: 11903106
Assignee: ZHEJIANG DAHUA TECHNOLOGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 16:
17. A method of driving a light-emitting diode (LED) load and a direct current to direct current (DC-DC) converter comprising:
generating, by a sampling sub-circuit, a current signal representing a load current of the LED load;
receiving, by a driving circuit, a brightness adjustment signal and a frequency adjustment signal;
generating, by the driving circuit, a first control signal, based on the current signal and the brightness adjustment signal, for controlling an output current of the DC-DC converter; and
generating, by the driving circuit, a second control signal, based on the frequency adjustment signal, for controlling a switching frequency of the LED load,
wherein the current signal representing the load current of the LED load is used to control the DC-DC converter to switch between a power-on state and a power-off state, and the method further comprises:
comparing, by the driving circuit, the load current with a current threshold;
generating, by the driving circuit, a power-off signal to control the DC-DC converter to stop supplying power to the LED load in response to a comparison result that the load current is higher than the current threshold; and
maintaining, by the driving circuit, the DC-DC converter to supply power to the LED load in response to a comparison result that the load current is not higher than the current threshold.