Patent ID: 11937349
Assignee: SHENZHEN HONTECH-WINS ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 7:
8. The drive circuit of the digital dimming LED light according to claim 1, wherein the constant current chopper unit comprises a resistor R22, a field effect transistor Q2, a resistor R27, a resistor R23 and a transistor Q4,
the resistor R22 is connected to the demodulation chip U1, and receives the PWM signal demodulated by the demodulation chip U1, the other end of the resistor R22 is connected to a gate of the field effect transistor Q2, a drain of the field effect transistor Q2 is connected to a negative input end of the LED light, a source of the field effect transistor Q2 is connected to the resistor R27, and the other end of the resistor R27 is grounded;
wherein a second connection point is provided between the resistor R22 and the gate of the field effect transistor Q2, and a third connection point is provided between the source of the field effect transistor Q2 and the resistor R27, and the second connection point is connected to a collector of the transistor Q4, a base of the transistor Q4 is connected to one end of the resistor R23, the other end of the resistor R23 is connected to the third connection point, and an emitter of the transistor Q4 is grounded.