Patent ID: 11895749
Assignee: JOULWATT TECHNOLOGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 14:
15. The LED drive circuit according to claim 13, wherein when the input AC power supply is post-cut by the dimmer, the comparing unit comprises:
a third comparing circuit, wherein a positive input terminal of the third comparing circuit receives the sampling signal and a negative input terminal of the third comparing circuit receives a second reference voltage signal;
a fourth comparing circuit, wherein a positive input terminal of the fourth comparing circuit receives the sampling signal, and a negative input terminal of the fourth comparing circuit receives a first reference voltage signal;
a second RS flip-flop, wherein a set terminal of the second RS flip-flop is connected to an output terminal of the third comparing circuit, a reset terminal of the second RS flip-flop is connected to an output terminal of the fourth comparing circuit, and an output terminal of the second RS flip-flop outputs the time signal T; and
a second time comparing unit, wherein a first input terminal of the second time comparing unit is connected to the output terminal of the second RS flip-flop, a second input terminal of the second time comparing unit receives a reference time signal, and an output terminal of the second time comparing unit outputs the regulating signal.