Learn with Mechanic Girl to build a rudimentary 12V battery charger, effective and as always simple to do.
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Hello my dear subscribers I imagine that many will have passed that leave some courtesy light or lights on in the car and when we start our engine, because the battery is dead ... For these cases where it really is a problem to take our battery to an establishment to charge it, because I bring a small and simple battery charger that you can put together and good that can save you from a problem.
The materials you will need are the following:
Two rectifier diodes 1N4007
An incandescent bulb and its bulb holder
A plug for receptacles
Assemble the charger is quite simple and just follow the following diagram:
This circuit is for those who have 220VAC voltage in their homes.
- Placing the fuse is essential. Because if there is a fault then it will open the circuit safely.
- It is necessary to pay attention to the polarity of the diodes since they assure us that the current flows in only one direction through the battery and that it is from positive to negative.
- The bulb must be incandescent. It does not work with the type of LED or fluorescent.
- Do not place suiches to light the charger. This is because not all the zones normalize the outlets and the suiche can be placed in a line that without wanting to be the neutral one, leaving the active phase, and good when touching it "will catch current". This is why it is best to leave it in the form of a plug so always remove the two wires from the outlet.
Well, at first glance, many will think that it is crazy to connect 110V to 12V, but not really, if we connect it as indicated in the diagram and see why:
As you can see it is a simple series circuit that we can analyze with Kirchhoff.
Volt Outlets = Volt Diodes + Volt Bulb + Volt Battery
Substituting some values:
Bulb power: 100W
Semiconductor voltage = 0.7V
Battery voltage: 12V
We would stay:
110 V = 0.7V + (100W / Load current) + 12V
Clearing, the charging current would be:
ICarga = 100 W / (110 - 12 - 0,7) V
For a 100W bulb, our charge current would be 1.13A.
For a 60W bulb, our charging current would be 0.61A.
Slow charging, depending on the watts of the bulb it will take about 4 or 5 hours to charge the battery.
It is a supervised charger, this is because by not having a regulator that reduces the load current to the float regime of the battery, since it will always be charging it causing overheating in it and it may explode. Then there must be a person always supervising the load to verify that everything is in order.
You must have a multimeter or voltmeter on hand to indicate the current voltage of the battery. It is considered charged with a voltage greater than or equal to 13.1VDC.
It should not exceed 2A load current. I have not tested him beyond that. LOL.
The charging current must not be less than 0.5A. Because this is the maintenance current of the battery so it would not be charging.
Well, it's all for the moment. I hope you like this other invention that good can get you out of some mess hehehe.
Again I tell you, if you do not know about electricity or are insecure with the connection, do not build this circuit. I do not want accidental electrocutions.
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