Battery charging automatic cut-off circuit diagram

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Nowadays, there are more and more battery cars, and the number of used batteries has increased. A considerable part of these waste batteries are damaged due to excessive charging time, which is manifested by the expansion and deformation of the bottle body. This production can turn off the power supply at the end of charging, which can avoid over-charging and prolong the service life of the battery.

First, the circuit is produced After the power storage charger is completed, the charger indicator light will change from red to green, and then charge for one hour to two hours. Therefore, the circuit includes a charge completion detection circuit, a long time delay circuit, and a switch drive circuit, as shown in the following figure.

Since the charging is completed by determining the color of the lamp, the detection circuit can be completed by the photoresistor network; since the charging time is long and there is sufficient accuracy, the delay circuit should be implemented by using the reference clock plus counting method. The circuit is shown below.

Second, the circuit works according to the switch AN, the charger works normally and outputs DC (36V or 48V), through the three-terminal regulator 7812 regulated output 12V voltage, the time base circuit 7555 starts to oscillate, and to the 12-bit binary counter / The divider CD4040 delivers a reference clock signal with a frequency of f = 1/t (adjusting RP allows t to vary between 0.7s and 7.2s). At the same time, the photoresistor is illuminated by the red light of the charging indicator and the resistance is reduced (the measured value is 800Ω or less). When connected in series with the 2kΩ resistor R, the voltage at the connection point M is greater than 8V. This high potential is sent to the CR terminal of the CD4040. Clear all outputs, and the counter stops counting. Q11 outputs low level, the transistor Q is forced, the relay J is pulled, and its normally open contact J1 is closed. At this time, the button switch AN can be released, and the charger starts to be the battery. Charging.
When the charging is completed, the indicator light changes from red to green, the resistance of the photoresistor receiving green light becomes larger (measured is greater than 10kΩ), the voltage at point M is lower than 2V, that is, the CR terminal of CD404.0 is low level, CD4040 The counting starts under the action of the clock signal. After 211 frequency dividing, Q11 outputs a high level, the transistor Q is turned off, the relay J is released, the normally open contact J1 is turned off, and the charging power source is cut off.

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