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Charging Circuit Answered

I was wondering if anyone had any ideas on how to make a circuit so that I could charge a battery, but that I can also power an amplifier when the battery is not charging. Currently I have a switch that switches between a charging circuit and powering the amplifier, but I was looking for a way to do this without having a switch that I have to control

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Dr SajithE
Dr SajithE

1 year ago

Hi
I need to convert 230v/5A to 12v/5A and store in a lead acid battery. I have some tools which will work in 12v . I need to power them on field to run some experiments.

So the stored energy need to come out as 12v/5A when its not connected to 230v AC current. atleast I need constant 12v /5A power output run up to 6hs.

Its basically like a UPS. But output should come as 12V/5A.(not as 230v/5A)

Once the battery/ies is down should be able to charge it from 230v.

Appreciate your help.

Thank you

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Omnivent
Omnivent

Reply 1 year ago

Hi,

It ranges from simple to not quite as simple, but you need to specify a few things more thoroughly as you wont ever see 12.000000V form neither battery, nor from converted mains.
.
What battery chemistry ado you have?
What allowable tolerance on the 12V (min and max)?
How proficient are you in building electronics?
.
If you send me a P.M. with the the answers to the above and your email address, I'll help you make such a system, adapted to your skill level (have made plenty of similar circuits).
.
Regards,
Omnivent (Electronics R&D Engineer)

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Dr SajithE
Dr SajithE

Reply 1 year ago

Hi, Thank you very much for agreeing to help Mr.Omnivent

Basically I'm a medical doctor and have very little knowledge in electronics. But I have made some circuits, but those are very basic ones..

Since I need to have the power for 6-8h on the field , I thought of using a 12v car battery with 50 -60A. Will it be fine?

If we keep a 20% tolerance on 12V DC. will it be fine? Maximum would be 14.7V.
I'm not familiar with PM

my e mail is edirisinghe@sjp.ac.lk

Please contact me vial e mail, Then we can work the circuit out.

Thank you

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iceng
iceng

6 years ago

Try this....

BATTcharger.gif
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Fozzibehr
Fozzibehr

Reply 6 years ago

also, how would this change if I wanted to run a 24 volt battery and amp?

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iceng
iceng

Reply 6 years ago

This circuit provides 24VDC by the LM317 regulator from the 30VDC input or the stand alone battery provides 24VDC and goes lower as it discharges.

The 50 ohm 2 watt resistor will charge a low ( say a discharged 20 volt ) battery with a 200ma current reducing to a maintenance charge of 100ma at 25v.

If you are using a small battery perhaps you will want to use a 200 ohm

resistor that uses a maintenance charge of 25ma.

24vBATTcharger.gif
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Fozzibehr
Fozzibehr

Reply 6 years ago

This is exactly what I was looking for, Thank You!

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iceng
iceng

Reply 6 years ago

Pleased to help.

You should include the your ability to understand circuit schematics and any other skills on your profile page.

A

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Fozzibehr
Fozzibehr

Reply 6 years ago

What kind of modifications would I need to be able to power this for 24 volts instead of 12?

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mpilchfamily
mpilchfamily

6 years ago

Sounds like the system need a larger charging circuit. One that can output enough power to run the amp and charge the battery. If the system has a switch to change between charge and battery then the manufacture skimped on the power supply.

You'll need to provide more information about the power needs of the system before anyone can help in redesigning the power supply for it.

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Fozzibehr
Fozzibehr

Reply 6 years ago

I have a 12 volt amplifier that is designed to run off a 12 volt dc power supply. Currenty I am running it off a 12 volt sealed lead acid battery. I have a switch that will either direct the power from the battery to the amplifier or to a charging plug. I was wondering if it was posible to create a circuit that would not require a switch. Below I have included a simple diagram to show you what i mean about the switch

switch diagram.gif
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Fozzibehr
Fozzibehr

Reply 6 years ago

actually the diagram is wrong. the base of the switch is at the battery and can change from the adapter and the amplifier