Practical NE555 chip made of battery full of self-stop circuit design

This article introduces a battery full of NE555 chip filled with self-stop circuits, its circuit is simple, no complex debugging. The circuit is charged with a charging indicator. When charging the battery, the LED indicates that the battery is in a state of charge. When the battery is fully charged, the LED is turned off, and the charging circuit is cut to prevent overcharging the battery. In the above figure, the NE555 and its peripheral components are connected to a Schmitt trigger for detecting the charging voltage of the battery. In the general application circuit of the NE555 chip, the 5 feet are grounded by a 0.01μF small capacitance ground, in this circuit, the 5 foot of the NE555 is generated by the 2.5V reference voltage generated by the source TL431, which can improve the detection of the charging voltage. Accuracy. Transfer files for [thin film switch] In the circuit, the 26 foot of the NE555 is directly connected to a Schmitt trigger, and the upper threshold voltage is 2.25 V (i.e., the stable voltage of TL431), the lower threshold voltage is 1.25 V, and the return voltage is also 1.25V. The S is the micro switch in the figure. Press S, the entire circuit is generated, because the voltage of the C1 is 0 when the power is just turned on, so the 2 6 feet of the NE555 are low, and the output terminal 3 foot output is high, the relay J is electrified Its normally open contact, the battery starts charging (+ V + V is the output voltage of the charger). The LED is a charging indicator, and the LED has been lit during the battery charging. When the battery is fully charged, the NE555's 26 foot voltage> 2.5V, at this time, the 3 foot output of the NE555 is low, the relay is stopped, and the battery stops charging while the LED is turned off. The full voltage of the battery can be adjusted by the resistor R1, changing its resistance, allowing the circuit to automatically stop charging at the desired voltage. Transfer files for [thin film switch] Electronic circuit DIY - The battery made by the NE555 chip is filled with self-stop circuit ▲ relay. Since the operating voltage range of the bipolar NE555 chip is 4.5 to 15V, the circuit is suitable for charging 6V or 12V battery, and if the battery is used to charge 24V, it can be supplied to the NE555 circuit with 7812.

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