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From: email@example.com (Tim Shoppa)
Subject: Re: Looking to make a 56 Amp NiMH Battery Charger
Date: 6 Jan 2003 09:14:03 -0800
NNTP-Posting-Date: 6 Jan 2003 17:14:03 GMT
Ian Rotheram wrote in message news:...
> can anybody suggest methods of making a 56 Amp NiMH battery charger
> for pack of cell either 3,4 or 5 cell packs or multiples of that, with
> the possibility of a car battery as the power source.
Is 56 Amp-Hours the capacity of the battery, or is 56 Amps the desired
charging current? (They'd both 56 if you want to charge in one hour...)
I've made switching current regulators up to several amps. In principle
I suppose these could be paralleled (though I've never tried). All my
inductor catalogs stop at DC currents of under 10 amps.
If you want to use linear current regulators, I know that they can be
paralleled. A bunch of LM317's and a monster heat sink, if you want.
> Also as an extra while were on large currents, how about a homebrew
> dummy load one that can handle 40 Amps and turn off when the batteries
> reach a set level and another that can sink 270 Amps (Stop Laughing)
Light bulbs are always good and satisfying as dummy loads. Parallel as
many as you need, add a relay if you want a cutoff. The "regulator" could
be a guy who screwed in additional bulbs as the cell voltage tailed off.
If you don't want light, a bunch of linear current regulators paralleled
might be the simplest way to go. The energy has to go to heat eventually!
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