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

Claim 0:
1. A circuit for driving a light-emitting diode (LED) load and a direct current to direct current (DC-DC) converter comprising:
a first sampling sub-circuit for generating a current signal representing a load current of the LED load; and
a driving circuit configured to:
receive a brightness adjustment signal and a frequency adjustment signal;
generate 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
generate 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 driving circuit is further configured to:
compare the load current with a current threshold;
in response to a comparison result that the load current is higher than the current threshold, generate a power-off signal to control the DC-DC converter to stop supplying power to the LED load; and
in response to a comparison result that the load current is not higher than the current threshold, maintain the DC-DC converter to supply power to the LED load.