Fast charge NiMH

[Biggles]

I have the unexpected need to add a fast charge battery function to a PIC based design. This is a little out of my experience, so I have looked at much good material on battery charging, but I'd like to know if you have any top tips.

I'll be monitoring for delta V and delta T. If you have experience with fast charging high capacity NiMH, I am interested to know how you terminated charge. Pre-conditioning the battery ( by complete discharge first, is not an option open to me. )

Thank you for your help or any pointers you have to good information.

[titi]

Hi,

I have found a link, i think it will help you.

Frequently Asked Questions about NiMH and NiCD Battery Chargers :

at http://www.greenbatteries.com/bachfa.html

Best Regards.

[dbcv]

Some battery charging circuit and charger based on microcontroller can be found at

http://www.explorecircuits.com/cir_power_battery_charger.htm

[Walkura]

Some time ago i been reading a datasheet about fastcharging NiMh battery's .
http://www.st.com/stonline/books/pdf/docs/2074.pdf
Hopefully its of use for you .

[frasenci]

And have you looked here ?

http://www.sonsivri.com/forum/index.php?topic=7322.msg34807#msg34807

 

Greetings
Francisco

[Biggles]

And have you looked here ?

http://www.sonsivri.com/forum/index.php?topic=7322.msg34807#msg34807

 

Greetings
Francisco

 

Yes I have seen that thread.  It is for a Lead Acid Battery. I am fast charging NiMH.



"

Hi everyone this is my first message so sorry for my faults....

I am looking for a battery charger circuit controlled with pic( 16fxxx series) but i can not find in the net a suitable one. I want to charge a lead acid battery. (12V) .  I need a pic controlled charger because i also want to use this circuit for control a TEC peltier device. Thanks  for you attention

"

[pickit2]

Once we had a auto-dialer controlled by a pic18f2550 this was powered by the main alarm panel, and as part of a new project that was to be self contained and mains powered with battery backup, we used the pcb of a ready made charger, the pic had a few inputs to monitor the Fast charger, the way we did it was to use the led indicators of the charger. when the battery pack was fully charged (green led light) we removed the charging power. and when voltage fell we reconnected power.

[cipiloi]

Hi, look hier   www.oshonsoft.com/picchargerlcdpro.html

[Biggles]

Here described advanced algorithm of fast Ni-MH charging. It`s more safe and fast as usual
-delta V algorithm. Some Ni-MH cells have no enought delta V falling, so it can be damadged with an usual algorithm.
http://www.st.com/stonline/books/pdf/docs/2074.pdf

The same link is given above by Walkura. The ST information is much useful.


My solution is in place and appears to be working ok.