Alt-BEAM Archive
Message #10282
To: beam@sgiblab.sgi.com
From: "Sathe Dilip" sathe_dilip@bah.com
Date: Wed, 16 Feb 2000 10:35:08 -0500
Subject: [alt-beam] Re: Solar cell Q
Hey Jim,
The principle still holds good for the output side of the DC-DC
converter. The capacitor can store current & deliver a higher value of
it for a shorter (flash) duration. Also it can not charge the capacitor
to a voltage more than the source (the rectified secondary winding of
the DC-DC converter in this case).
Dilip
---------------------------------------------------
Jim Taylor wrote:
>
> Not if your running a DC, DC converter, such as a camera flash. They charge
> to somewhere in the range of 300 to 400 volts, although at really really low
> mah's. I belive the converse would also be capable, converting large
> amounts of voltage, into large amounts of current.
>
> |____|
> -------O()O-------
> James Taylor
> URL: http://fly.to/springmeadows
> ----- Original Message -----
> From: William Cox
> To:
> Sent: Tuesday, February 15, 2000 3:32 PM
> Subject: Re: Solar cell Q
>
> > So a cap can store MORE current than the cell supplies at one time and NO
> > MORE voltage than the cell can supply at one time? Is that it?
> > -William
> >
> > ----- Original Message -----
> > From: Sathe Dilip
> > To:
> > Sent: Tuesday, February 15, 2000 10:28 AM
> > Subject: Re: Solar cell Q
> >
> >
> > > The capacitor we connect in parallel with the solar cell acts like a
> > > current storage tank. You save enough current to last you for a small
> > > burst of motor (run) power. The level of current stored in the tank is
> > > indicated by the voltage on the capacitor. How much current you can
> > > store is decided by the size/value/capacity of the capacitor.
> > >
> > > I don't know about the American curriculum but we used to have math
> > > problems in school about a tank with a faucet filling it & another
> > > emptying it. If you have done those, you will understand the above
> > > analogy even better.
> > >
> > > Dilip
> > > -------------------------
> > >
> > > William Cox wrote:
> > > >
> > > > Q: All the solar cells in Solarbotics catalog have a small current
> > rating, I
> > > > mean, that the current they supply is smaller than the motors draw
> (30 -
> > > > 45ma). How does this work? I've got the MPJA motors, and someone said
> > that
> > > > they draw about 45ma, what type of solar panel should I use? I'm using
> a
> > > > FLED, so I guess I'd need something with >2.4 or so volts. What about
> > > > current? Right?
> > > > -William
> > > >
> > > > ____________________________
> > > > http://robot-central.webjump.com/
> > > > Robotics books, projects, resources,
> > > > links, news, and more!
> > >
> > > --
> > > ----------------------------------------------------------------------
> > > The early bird may get the worm, but the second mouse gets the cheese.
> > > ----------------------------------------------------------------------
> > >
> >
> >
--
----------------------------------------------------------------------
The early bird may get the worm, but the second mouse gets the cheese.
----------------------------------------------------------------------
10283 Wed, 16 Feb 2000 08:39:55 -0700 [alt-beam] Re: UBB? beam@sgiblab.sgi.com Robert Stein I also would stay "loyal" to this email list. I too, find it much more
convenient to download and read ay my leisure. I have gotten a bunch of
help and ideas from messages that I thought I didn't want to read
about. MANY people post a subject line but talk about more that one
subject. I if you are just scanning subject lines, you are likely to miss
something. Besides I need another Internet program or password to keep
track of, like I need a hole in my head.
10284 Wed, 16 Feb 2000 11:03:02 -0500 [alt-beam] Re: Solar cell Q beam@sgiblab.sgi.com "Sathe Dilip" Then the solar cell prevails. The capacitor in this case (depending on
value) can help smooth out some output voltage variations that would
have happened in changing light conditions.
One example would be a bot (say a solar roller) crossing a shadow area
between two well lit zones. The capacitor can provide the power
required to coast through the shadow area.
Dilip
-------------------------
Steven Dang wrote:
>
> But what happens when the solar cell is able to provide more than enough
> current for the circuit.
>
> > > > The capacitor we connect in parallel with the solar cell acts like a
> > > > current storage tank. You save enough current to last you for a small
> > > > burst of motor (run) power. The level of current stored in the tank is
> > > > indicated by the voltage on the capacitor. How much current you can
> > > > store is decided by the size/value/capacity of the capacitor.
> > > >
SNIP
----------------------------------------------------------------------
The early bird may get the worm, but the second mouse gets the cheese.
----------------------------------------------------------------------
10285 Wed, 16 Feb 2000 07:56:51 -0500 Re: UBB? Seamus Allan
> Personally, the only reason that I like and use the mailing list is
because
> it is email. I don't have to go onto the internet, as such, and I can
> download it all at once, disconnect and read it at my pleasure, rather
than
> having to find the message and then view it .. etc.
>
> The newgroup idea was good, but the chances are that many ISP's won't show
> the group (I have been on 2 isps, and can't find some groups), then you
say
> 'what about deja.com', then we are on the internet again.
>
> You can start up some web based beam list system, but I would stay loyal
to
> the good old email.
>
> Hope not to sound too anti-everbody,,
> Seamus Allan
>
>
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> Join today by adding 'MOOSE2000' to your email signature!!
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