First of all sorry for my bad english because its not my first language.
I want to create a 220V AC to 14V DC 20A power supply to charge my Lead Acid 12V(200AH) battery.
i know 4-5 A is enough to charge it normally but after using it for 4-5 months user need to charge it on higher Ampere to maintain battery gravity.
so any circuit diagram or any other help will be appreciated
Thank you in advance,
Peace.

 

Go buy a common 20+ amp automotive battery charger.

Unless you can get the correct size and voltage transformer and rectifiers for free you wont build a battery charger for less than you can buy one.

 

Go buy a common 20+ amp automotive battery charger.

Unless you can get the correct size and voltage transformer and rectifiers for free you wont build a battery charger for less than you can buy one.

so your suggestion is that i should buy a branded one,not build my own ? why! is it so hard to make ?

 

is it so hard to make ?

It' is not so hard for me to make, but I just make a DC power supply and watch carefully as it charges the battery. Most other people want their battery charger to know when to stop, or do 3 stage charging. That can be fairly simple or fairly complicated. You have not said much about what you want, except that you explained that you don't know about standard charging rates and why they should decrease as the battery gets old.

 

is it so hard to make ?

If you need to ask for help, there's a good chance that your desire exceeds your ability.

There's also the fact that a high volume commercially available charger would cost less than building your own.

 

If you need to ask for help, there's a good chance that your desire exceeds your ability.

There's also the fact that a high volume commercially available charger would cost less than building your own.

Yes i know but i have a plan to build that charger on one pcb with a microcontroller so that's why i can't afford to have charger attached differently from main pcb because its gonna cost me more space and problems so thats why i need to make it on required pcb board.

 

Here's one from Google....


http://www.electroschematics.com/wp-content/uploads/2010/10/12v-charger.jpg

 

Here's one from Google....


http://www.electroschematics.com/wp-content/uploads/2010/10/12v-charger.jpg

its 5A i need 20

 

So use a 20A transformer and bridge rectifier, ok.

 

its 5A i need 20

Also note that that "charger" has no voltage regulation or timers.

Here's an article on how to charge lead acid batteries.

For US$30, I can buy a 10A charger that turns itself off when the battery is fully charged. All nicely packaged. I know how to design and build one, but if I can buy one for $30, it's not worth the time or effort.

 

So use a 20A transformer and bridge rectifier, ok.

The transformer should be derated at least 40% if you want 20Adc into a battery, due to the high peak RMS current through the rectifiers, thus the transformer RMS current rating should be at least 30A.

 

Thank you so much for help guys now i understand it better than before i hope it will help me in my project

 

http://www.electroschematics.com/wp-content/uploads/2010/10/12v-charger.jpg

The 2nd most dangerous charger schematic I've seen.

ak

 

The 2nd most dangerous charger schematic I've seen.

Certainly if there's nothing to limit the charging current.

Okay, I'll bite.
Whats the 1st?

 

No ammeter. 0.01 ohm is better than nothing.

ak