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Old 27th November 2003, 05:54 AM   #11
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Found this on National's site. Any idea what should be done to convert it to 24V charging?

This certainly looks like a smart way to charge
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Old 27th November 2003, 06:05 AM   #12
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you could try the L200 regulator...but I'm not sure if it'll work at 24V..
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Old 27th November 2003, 06:21 AM   #13
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the only problem with charging batteries in series is that if you have a defective cell in one of batteries then the charger will try to over compensate (more current) and the batteries will "heat" up or one will get charged more than the other.
a typical cell wants a charging voltage of 1.2 volts per cell and for small batteries a 500 Ma charge is is used for fast charging where a 100Ma trickle charge will sustain its integrity....that is my experience with 3-12 AH 12 v rechargible batteries


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Old 27th November 2003, 06:27 AM   #14
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yeah...I wonder if there's a circuit which will automatically charge cells in parellel and connect them in series after charging....
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Old 27th November 2003, 06:37 AM   #15
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Yeah, Joe Dirt if you think about it whats inside a battery is series cells same can happen inside a battery as outside a faulty cell, so no difference.
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Old 27th November 2003, 06:41 AM   #16
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Quote:
Originally posted by li_gangyi
yeah...I wonder if there's a circuit which will automatically charge cells in parellel and connect them in series after charging....
I guess cowanrg came up with such circuit. Although he claims he posted it 10 times already, I saw it only once IIRC.
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Old 27th November 2003, 07:32 AM   #17
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can we have a look at the circuit?? I can't seem to find it anywhere...other than a post which describded it...but no schematics...
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Old 27th November 2003, 04:11 PM   #18
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Maybe you should try this circuit

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The content of that page is not written in English but I think the schematics are easy to understand. I think this circuit comes from one of the datasheets of NS regulators but I cannot find it now. When the battery is low, this circuit charges the battery with an adjustable constant current. After the battery is fully charged the circuit will turn into a constant voltage source and hold the voltage at 13.8V. The relay cuts all active devices from the battery when the AC power supply is pulled off.
The website is in Taiwan and the PCBs are already sold out. However, it should be quite easy to do it P2P and won't cost you more than $5.
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Old 27th November 2003, 04:55 PM   #19
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we're talking about 24V (2 batteries here) a L200 regulator seems to be an all-in-one thingy for 12V...
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Old 27th November 2003, 05:47 PM   #20
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Have you checked UC3906 from Unitrode? IC made for charging lead batteries.

http://www.elfa.se/elfa/produkter/se/226604.htm
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