Lead-acid battery charging circuit

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Alireza770717

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"This schematic is for a lead-acid battery charger circuit. I've set up this circuit, but it's only charging at about 15 milliamps. Can anyone help me troubleshoot this problem? By the way, all component values are according to the schematic, except I used a 13-volt transformer instead of a 15-volt one."

I anticipated that the circuit would output an initial charging current of approximately 400 milliamps, which would subsequently taper off to 100 milliamps as the battery reached a full charge.

 

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Hi,

there are 3 pots to adjust operating points.
Did you do it? They need to be adjusted.

My guess:
* VR1 and VR2 set the currents for charging and idle
* VR3 sets the end_of_charging voltage

I don´t tink it´s your design. Thus I expect there comes some description along with the schematic. --> use it. And on any questions refer to it. Give a link.

The design needs to care about the high current paths as well as to for the amplifiers not to oscillate. You should have some understand on how to do so.
If you want us to give more detailed help, you need to do soem measurements and give us the values. Like C1 voltage, battery voltage, IC1_pin2, IC2_pin1, IC2_pin7 ...

This is a mature design maybe from 40-50 years ago. Electronics has advanced since then, also the understanding of the battery chemistry.
Thus a modern design would use switch mode technique and dedicated battery charger ICs to reduce part count, to reduce dissipated heat (waste) and to increase accuracy and battery lifetime.

Klaus
 

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Thank you very much. You're sending me a suitable circuit for charging.
 

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Hi,

As a professional I would
go the internet site of my electronics distributor and do a search for "battery charger IC" or similar.

Then you get a list of ICs.
You may refine the list, you may chose an IC and look for it´s internet site and datasheet

or you may just get the information about the IC manufacturer and do the search at the manufacturer´s site
You can use their selection guides to narrow on chemistry, voltage, charging current, features ...

So you immediately get price, most up to date informations, availability, complexity, schematics, application notes, design notes, additional tools like simulation and so on...

But this all is your job, not mine.

Klaus
 

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