Re: circuit for charging batteries in cordless Mouse from USB Port
From: Andrey (a8421_at_intergate.bc.ca)
Date: 09/28/04
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Date: Tue, 28 Sep 2004 12:16:23 -0700
Hello Ian,
thank you for the advice. It gives me some confidence.
It is strange, I see your reply but I do not see my posting. Your reply
indicates that the posting was posted. How come other people could see it,
and I could not?
This would be a question to group administrator I guess. How to write to
him/her directly?
Sincerely,
Andrey
"Ian Stirling" <root@mauve.demon.co.uk> wrote in message
news:41599694$0$82266$ed2619ec@ptn-nntp-reader03.plus.net...
> Andrey <a8421@intergate.bc.ca> wrote:
> > Hello All,
> >
> > does anyone knows what would be a proper circuit to charge a pair of Ni
MH
> > batteries (2.4 v) from USB in Cordless Mouse? I opened mine and found
> > resistor and a diode in series. Such circuit may offer some protection
(from
> > overcurrent and voltage excess to USB) but I do not see how it satisfies
> > recuirements prescribed for Ni MH battery. My mouse is of cheap variety
> > "made in China" and folks there do not always follow proper design
> > practices. Looked up Motorola reference design for cordless mouse - they
do
> > not discuss power arrangements at all there.
>
> A resistor and a diode will be just fine.
> If you only charge it until it's full (work out charge current, ...)
> If you plug it in overnight, then you should adjust the resistor to
> give a charge somewhere around C/20.
> The 'right' solution would be to fit a proper battery charger
> circuit, with delta-v detection.
>
>
- Next message: mike: "Re: Can I (safely) run several NiMh battery packs in parallel?"
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