View this page "Charger"

[UHCL SenProj 010 spr/fall]

i fixed up the ckt a little, can you figure out how to delete all
those duplicate pages ?

Click on http://groups.google.com/group/uhclseniorproj010/web/charger?hl=en
- or copy & paste it into your browser's address bar if that doesn't
work.

[UHCL SenProj 010 spr/fall]

I finished the charger, all currents look good. I also explain the
operation of it, the other one was fatally flawwed but easily fixed
with another transistor.

[Joseph Lopez]

Just an FYI, I've edited the page for the charger.

[zonemikel.com]

good work. ya the current will drop over time thats how we know the battery is filling up, then supposedly when current is really low the battery is almost the same as the charger so we stop charging. I never thought about the fact that this would affect charging time. Not sure how you could test if how much the batteries charged, maybe hook them up to a light and see what the current is then when the light goes out we know there is no more current ? Do good, Be Well, Michael --- On Thu, 3/11/10, Joseph Lopez <jolo...@gmail.com> wrote:

[Joseph Lopez]

Charger page has been updated.

Click on http://groups.google.com/group/uhclseniorproj010/web/charger

[zonemikel.com]

Great work joseph, I remember when i was working on finding stuff for battery chargers its not very easy ! It seemed to me as if there was very little information on the topic. From what you've said it looks to me like a good option would be to monitor the temperature of the batteries using a temp sensor (lm35) i think and have a way to totally shut off the charging circuit when it starts getting hot (eg. Transistor controlling the vin to lm317 or relay). We could also do this circuit discreatly if your up to looking down that alley, for example just trip a relay when the temp sensor reaches a certain temp? Be thinking about how you would implement it both ways (and maybe others?) that way you can write up something that compares and contrasts the designs to pick the best. I'f you ever need info you can call (409)354-1712 i have long periods that i'm stuck driving to/fro school and i love to pass the time talking.

Do good, Be Well, Michael

--- On Wed, 3/31/10, Joseph Lopez <jolo...@gmail.com> wrote:

From: Joseph Lopez <jolo...@gmail.com> Subject: View this page "Charger" To: "UhclSeniorProj010" <uhclseni...@googlegroups.com>

-- To unsubscribe, reply using "remove me" as the subject.

[Joseph Lopez]

I actually found a pdf from National Semiconductor that seems to show
different designs for battery chargers, specifically for nickle
batteries and lithium ion batteries. I haven't read all of it yet so
I'll let you know if I find anything useful among that information. It
uses a different chip than the 317, but I'm more concerned with how
they're detecting end of charge and how they tell the circuit to shut off.

Joseph

zonemikel.com wrote:
> Great work joseph, I remember when i was working on finding stuff for
> battery chargers its not very easy ! It seemed to me as if there was
> very little information on the topic. From what you've said it looks
> to me like a good option would be to monitor the temperature of the
> batteries using a temp sensor (lm35) i think and have a way to totally
> shut off the charging circuit when it starts getting hot (eg.
> Transistor controlling the vin to lm317 or relay). We could also do
> this circuit discreatly if your up to looking down that alley, for
> example just trip a relay when the temp sensor reaches a certain temp?
> Be thinking about how you would implement it both ways (and maybe
> others?) that way you can write up something that compares and
> contrasts the designs to pick the best. I'f you ever need info you can
> call (409)354-1712 i have long periods that i'm stuck driving to/fro
> school and i love to pass the time talking.
>
> Do good, Be Well,
> Michael
>

> --- On *Wed, 3/31/10, Joseph Lopez /<jolo...@gmail.com>/* wrote:
>
>
> From: Joseph Lopez <jolo...@gmail.com>
> Subject: View this page "Charger"
> To: "UhclSeniorProj010" <uhclseni...@googlegroups.com>
> Date: Wednesday, March 31, 2010, 1:20 AM
>
> Charger page has been updated.
>
> Click on http://groups.google.com/group/uhclseniorproj010/web/charger
> - or copy & paste it into your browser's address bar if that doesn't
> work.
>
>
> --
> To unsubscribe, reply using "remove me" as the subject.
>

> To unsubscribe from this group, send email to
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