vrla battery charger with avr

Thread Starter

meysaminter

Joined Dec 22, 2009
6
Hi
I'm tying to buid a VRLA battery charger
(model:ML12120 12v12AH . datasheet: http://maxpowertop.com/pdf/ML12120.pdf ):first the constant current and then constant
voltage is reqiured to charge the battery. Since the time of charging is about 10 hour , I want to know that is it nessary to
use a PID control feedback to speed up the regulation of current in the constant current charging (MOre instruction:
http://www.atmel.com/dyn/resources/prod_documents/current_supply.pdf) or a stap by stap increasig or decreasing in the switch
time on, to regulate the current is sufficient? the design based in useing the AVR microcontroller.
I will be glad to resive a designed models.
thanks.
 

Duane P Wetick

Joined Apr 23, 2009
435
Proportional, Integral and Derivative (PID) charging is the best way to charge a battery to 100%. Other methods typically will get you to something less than 100%.
But, maybe that is OK in your case? Don't forget this is a chemical reaction that is time and temperature dependent. Battery technology hasn't changed much...we are still using Thomas Edison's designs.

Cheers, DPW [ Everyone's knowledge is in-complete...Albert Einstein]
 
Last edited:

Thread Starter

meysaminter

Joined Dec 22, 2009
6
how can i impelement the PID in micro?
I want use this PID controller to uc3909 or 3906 battery charger too!
does have anyone ther circuit ?
thanks.
 

Duane P Wetick

Joined Apr 23, 2009
435
See www.Batteryuniversity.com for some insight into battery charging. Putting someone's proprietary design work on this forum will probably get us into hot water in no time flat. You can probably buy a programmable PID controller for not a lot of money these days, then its just a number crunching exercise.

Regards, DPW [ Everyone's knowledge is in-complete...Albert Einstein]
 
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