Description:
In this electronics project, I have explained how to make automatic battery charger circuit for any battery on the zero PCB. You can easily make this auto cut off charger circuit for charging a 12V battery or a 6V battery.
First, you have to set the cut-off voltage, then you can supply 220V or 110V AC supply at the input and connect the 12V battery at the output.
The charging will automatically stop when the voltage across the battery crosses the preset cut-off voltage.
Circuit of Automatic Battery Charger
The circuit is very simple, You can easily make this project with some basic electronics components.
PCB Layout for Automatic Charger Circuit
Download the PCB layout, then print it on an A4 page. Please check the PCB size while printing, it should be the same as mentioned.
Required Components:
- 1k Resistor 1/4 watt (2no)
- 10k Potentiometer (1no)
- 10k Resistor 1/4 watt (1no)
- 10uF 35V Capacitor (1no)
- 1000uF 35V Capacitor (1no)
- 1N4007 Diode (1no)
- 1N5408 Diodes (5no)
- LED 1.5V (2no)
- BC547 NPN Transistor (1no)
- 12V SPDT Relay (for 6V use 5V relay)
- Connectors
- 15V 2A Step-down Transformer
- Zero PCB or Cardboard
Tutorial Video for Auto Cut-Off Charger
In the tutorial video, I have shown all the steps to make the Auto Cut-Off Battery charger circuit. So please watch the video for a better understanding.
How to Make the Automatic Battery Charger PCB
Steps for making the Automatic Battery Charger circuit on PCB
- Print the PCB Layout and stick it on Acrylic sheet or cardboard
- Drill the holes for the components as shown on Layout
- Connect all the components as shown on the layout
- Solder those Components as shown in the circuit
- Now, the Auto Cut-Off Charger PCB is ready
Setting the Cut-Off Voltage
Now, to set the cut-off voltage, you have to connect a variable DC power supply at the DC input and connect a multimeter (voltmeter) at the battery side as shown.
For example, to set the cut-off voltage at 13V, you have to give 13V at DC input.
Then rotate the potentiometer until the red LED turns on.
After setting the cut-off voltage disconnect the variable DC supply and connect the step-down transformer at the AC input, as shown in the circuit diagram.
Please take proper safety precaution while working with 220V or 110V supply.
Finally, Auto Cut-Off Battery Charger is ready
Connect a Lead Acid Battery at the Battery side (as per the circuit.)
Then give the 220V or 110V supply, the green LED will turn on, which indicates the battery is charging.
When the voltage across the battery cross the cut-off voltage, the relay will turn off and the battery will be disconnected from the supply.
Please share your feedback on this mini-project and also let me know if you have any queries.
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I hope you have liked this projects, Thank you for your time.
Dear,
I want to charge my 12V 30Ah Lead Acid Battery with 10 amp current. Does this circuit work for me? Or anything needs to be changed in this circuit? Please help.
It’s hard to come by educated people for this topic, however, you sound like you know what you’re talking about!
Thanks
If we increase the 15V 10A Step-down Transformer so which parts value will be increase?
Hello sir you have made this circuit it is beautiful but would like to ask you ,that i am having 6v 3W solar can we use this
Which components should I have to change to make 6v auto cut off lead acid battery charger?
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lovers except this paragraph is really a nice article, keep it up.
How would I modify this circuit to change the input to 12 VDC instead of 220V?
Very good description of the project. The best thing is that you are also providing circuit diagram and pcb layout
You have presented it in such a way that a beginner could learn so easily. Thank you very much for this teaching. I learnt something new.
Dear Sir,
Happy to say you this circuit is working correctly. We can make it on a PCB Board. It`s very useful for Beginners and electronic lovers.
Thank`s you for good job.
Very good ideas, from the circuit itself to the simple method of implementation to the presentation.
This is a very useful project that is very well done.