Light source protection and user-friendly soft lights-off drive circuit

　　If your room wiring is not designed very scientifically, it will cause bumps and bumps when you go to bed after turning off the lights. A circuit design introduced in this article is a kind of automatic lights-off circuit that gradually extinguishes the lights after turning off the lights. Allows you enough time to take advantage of the light from the lamp before going to bed and then automatically shuts off. And the circuit consumes almost no power when not lighting. Of course, this kind of circuit can also be applied to many other places.

　　After turning off the lights in the bedroom, the lights gradually dim and you have enough time to get to bed. This circuit has many other applications.

　　After this automatic lights-off circuit is activated. Allows you enough time to take advantage of the light from the lamp before going to bed and then automatically shuts off. The circuit consumes almost no power when not illuminated.

　　The 220V AC 18650 battery 3.7v 3500mah uses capacitors to step down the voltage. C1 in the figure is the current limiting capacitor. C2 is a timing capacitor with a capacity of 1F. When the switch S1 is closed for a moment, the large capacitor C2 is charged, and its stored energy drives the internal LED in the optocoupler module MOC3041 through R4. Complete the zero-crossing detection driving function of the external triac BT136.

　　The working process of the circuit is very simple: close S1 and hold it for a moment. Wait for the 220V AC 18650 battery 3.7v 3500mah to charge the capacitor C2 through the current bridge D1~D4, and then release S1. At this time, the gate of the triac BT136 is triggered and turned on. The bedroom lighting L1 emits light, making it easier for the owner to go to bed. After the master lies down and is ready. At this time, the charge on C2 is completely released. The lights also turn off automatically. The lighting time controlled by C2 and R4 is approximately a few minutes. This is enough time to complete all preparations before going to bed.

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