Battery protection for over charge and deep discharge

hello every one plzzzz help
i have used 12v 7.5ah lead acid battery for led light
we want to know that how to protect this battery from over charge and deep discharge
over charge voltage is 13.4v and deep discharge voltage is 10v
if any analog circuit so plzzzzz update

thank you every one

Hi,

did you do an internet search?
--> There are plenty circuits around.

There even are dedicated ICs doing this.

So what´s excately the problem?

Klaus

i have search lots of on internet but no working circuit are available
if you know about any link plzzzzz send

thank you every one...

Click to expand...

Well meant but if you try halfway, we can try to help you reach the final goal. This is a discussion forum and we cannot do the work you are supposed to do.

You need a DC supply that will have some current regulation and over and under voltage cutoff.

If your battery is sealed maintenance free type, you can not use some arbitrary circuit because the battery will die if you charge too fast, gas forms inside and the plates deform.

Simple circuit will be a const current charger with a low voltage limit of 10.8V (say 11V) and a upper limit of 13.4V (say 13.8V).

There are other considerations too: are you going to keep the battery connected to the charger all the time? What is the actual load? What is the total power and duration (say in 24 hours) the load will be on?

You are unable to search because you do not know what you want. Please think over and define your search, try and if you have some difficulty, however minor, there will always some help here.

You need two different circuits.
One to control the charging and one to cutoff the battery when the voltage drops to 10V.

The charging can be done by a commercial smart battery charger, cheaper than you could make one.

The cutoff can be done by the circuit attached.
The LTspice simulation shows it cutting off the load at 10V (adjustable by pot U2).
The transistor can be any P-MOSFET that can carry the load current with a small voltage drop (as determined by its Rdson value).

There are bunch of circuits available in this regard. An example from Engineers garage: **broken link removed**. Don't rely on spoon feeding, 90% chances are you can't find a circuit custom designed for your application. Do search, modify the results for your case. That's simple, fair & square.

eresearchlab said:

deep discharge voltage is 10v

Click to expand...

This is a simple method to shut off the led when battery drops to 10V. It is not a battery charging circuit. It addresses the easy question in this thread.

The supply ranges from 9 to 11v. Notice that current flows to the led only when the supply is above 10V.