18650 battery 4800mah full self-stop circuit diagram

　　The 18650 battery 4800mah full-fill self-stop circuit made using the NE555 chip is simple and does not require complex debugging. This circuit is equipped with a charging indicator light. When charging the 18650 battery 4800mah, the LED indicates that the 18650 battery 4800mah is in a charging state. When the 18650 battery 4800mah is fully charged, the LED indicator light goes out and the charging circuit is cut off to prevent overcharging from damaging the 18650 battery 4800mah.

　　The 18650 battery 4800mah full-fill self-stop circuit made using the NE555 chip is simple and does not require complex debugging. This circuit is equipped with a charging indicator light. When charging the 18650 battery 4800mah, the LED indicates that the 18650 battery 4800mah is in a charging state. When the 18650 battery 4800mah is fully charged, the LED indicator light goes out and the charging circuit is cut off to prevent overcharging from damaging the 18650 battery 4800mah.

　　In the picture above, the NE555 and its peripheral components are connected into a Schmitt trigger, which is used to detect the charging voltage of the 18650 battery 4800mah. In the general application circuit of the NE555 chip, its ⑤ pin is connected to the ground through a small capacitor of 0.01μF. In this circuit, the ⑤ pin of the NE555 is connected to the 2.5V reference voltage generated by the precision reference voltage source TL431, which can improve the detection of the charging voltage. Accuracy.

　　In the circuit, the ②⑥ pins of NE555 are directly connected to form a Schmitt trigger. Its upper threshold voltage is 2.5V (that is, the stable voltage of TL431), the lower threshold voltage is 1.25V, and the hysteresis voltage is also 1.25V.

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