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dV Battery Charger for Ni-Cd or Ni-Mh batteries

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oddbudman

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I was wondering if anyone had any links / info on a dV (change in voltage) based battery charger for Ni-Cd or Ni-Mh batteries.

Ideally I am looking for a simple low cost comparator (ie LM393 or similar) based circuit and want to avoid using a more expensive dedicated battery charger IC solution.

I need to charge 2-5aH battery packs in around 16 hours.

Any tips would be appreciated.

Thanks,
oddbudman
 

oddbudman

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Re: dV Battery Charger

Not quite what I'm after.

When you charge a Ni-mH or Ni-Cd battey the voltage graph looks like the attached image. I am using a constant current charger.

When the battery charge is full the voltage of the battery drops as is shown in the attached image.

I am wondering if there is a simple way to detect that the voltage differential has turned negative over time so I can reduce my charge current to the battery.

Ideally I want to use a cheap IC based solution, something like a 555 or a LM393 would be good.

any further input would be appreciated.

oddbudman
 

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