Hi everybody I want to make a phone charger with a 12v battery (model no. sb1290) and was searching for a suitable regulator and I found this device online and I want to know if I have to use any further device or circuit to connect this module to my phone?
THE LINK FOR THE MODULE:https://www.mondaykids.com/monday-k...a-car-charge-charging-regulator-6-45-26v.html

 

This should be suitable for the purpose.
The only addition I would suggest would be some kind of ventilated insulated box to put it in to avoid any short circuit. It needs to be ventilated as the regulator will get warm.

 

Other suitable regulators can be found at Pololu or can be made yourself(lm2576 T-5 etc.).Also you should add a way of cutting off the regulator when the battery is nearly empty.

 

Other suitable regulators can be found at Pololu or can be made yourself(lm2576 T-5 etc.).Also you should add a way of cutting off the regulator when the battery is nearly empty.

sorry I didnt get one of the points you made. you said "you should add a way of cutting off the regulator when the battery is nearly empty" why should I do that?

 

sorry I didnt get one of the points you made. you said "you should add a way of cutting off the regulator when the battery is nearly empty" why should I do that?

Depending on your battery type some batteries need special attention.Your's is a lead acid so it's simpler and won't fuss so much about sucking nearly all the juice,but you shouldn't discarge any battery to 0 completley since it can shorten it's life span.Also beyound a point it will give you something around 11-12 V but won't be able to deliver any current any more.In that case it's better to just disconect (disable) the regulator and flag a led indicator that it's empty.Most power banks have this,tho they use a more "delicate " battery type.There are circuits for this.Look for under-voltage lockout on google and you should see the classic zenner-transistor one..also try to see at what voltage the battery is considered empty and set the under voltage for that level.

 

@Andrei Suditu -

That is only a consideration if you are charging the battery directly. All a phone needs is a constant 5V, it has all the other circuitry built in.

Bob

 

@Andrei Suditu -

That is only a consideration if you are charging the battery directly. All a phone needs is a constant 5V, it has all the other circuitry built in.

Bob

Yeah...but what if you over discharge the battery while charging....on Pb acid is no big deal but if you let them sit around uncharged then they will go bad.

 

Never seen a phone with a lead acid battery.

Bob

 

Never seen a phone with a lead acid battery.

Bob

I belive he is aiming for something like a power bank...

 

Well, I take the TS’s word that it is for charging phones.

Bob

 

well probably I am going to use a voltmeter between the 12v battery and the regulator so that I will be able to monitor the voltage and cut the power manualy if the battery is discharged.

 

This should be suitable for the purpose.
The only addition I would suggest would be some kind of ventilated insulated box to put it in to avoid any short circuit. It needs to be ventilated as the regulator will get warm.

Would this module take care of all the details to charge the battery of a mobile? Aren't they critical things, those batteries?

 

Would this module take care of all the details to charge the battery of a mobile? Aren't they critical things, those batteries?

The mobile handles the battery charging, it just needs a 5V supply.

 

The OP is just designing a 5V PSU, right? Not a phone charger.

 

Hi everybody I want to make a phone charger

The first sentence of hos original post.

Bob