Automatic 12V Battery Charge Circuit with CD4043

Description:

Batteries are systems which store energy in appropriate conditions by using other power supplies, and than use this energy when needed. They incluede rechargable chemcial material. To charge the battery ,ten percent of the power of the battery should be applied. For instance, consider a 40 A battery, we need to apply 4 amperes to charge it. The voltage value to charge a 12V battery is about 14V. Higher values than 14V will demage the battery. Lower values than 14 will be insufficient and this situation will cause the battery work inefficient. Another important issue is the minimum voltage usage of the battery. This minimum value should be usually 11V and while designing circuits, this value should be considered.

More about the circuit:

This circuit is designed to charge 12V batteries. The minimum limit should be 11V and the maximum limit should be 14V.  Two comparators are used for calibrating the circuit. After reaching the desired values, the inputs of the RS Flip-Flops are set to high and the relay at the output is triggered. LM393 IC is used as the comperator and CD4013 IC is used as the RS Flip-Flop. The VR1 and VR2 pots should be multi-turn trimpots that will increase the sensitivity. The relay should be choosen by considering that it can draw the current passing through it with no demage.

The circuit can determine whether it is charging or not . The LED illuminates during the charge process.

Parts List:

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