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'[EE] Super- and Ultra- capacitors as alternatives '
2008\04\25@194940 by Jinx

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en.wikipedia.org/wiki/Supercapacitor

http://www.skeletonnanolab.com/

2008\04\25@210016 by James Newton

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www.skeletonnanolab.com/img/ragone.png is an interesting graph

--
James.

-----Original Message-----
From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu] On Behalf Of
Jinx
Sent: Friday, April 25, 2008 16:49
To: pic microcontroller discussion list
Subject: [EE] Super- and Ultra- capacitors as alternatives to batteries

http://en.wikipedia.org/wiki/Supercapacitor

http://www.skeletonnanolab.com/

2008\04\25@213019 by Jinx

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> http://www.skeletonnanolab.com/img/ragone.png is an interesting graph

Many products are going to be so much better once the nanotechnology
revolution really kicks in

Capacitors are already attractive in some applications because of the
simple charging characteristics, no memory, very much longer cycling
life-time etc

2008\04\25@223528 by Apptech

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> http://www.skeletonnanolab.com/img/ragone.png is an
> interesting graph

Supercaps are getting better but it seems like it will take
a while to get anywhere near battery Wh/kg ratings at an OK
price.

Where they may win well before then is in the peak load
absorption and delivery area (as mentioned in those various
pages). Ability to charge without damage at many times the
rate of a battery allows eg god use of regenerative braking
energy.


2008\04\26@174147 by Brooke Clarke

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Hi:

As far as I can tell ALL of the super caps offered in the 1 Farad and down
range are NOT rated to deliver any power.  I.e. they are designed for backup
memory use and have very high internal resistance.

I'm in the process of repairing an HP 4328A Milliohmmeter and one of the jobs
for it is measuring battery resistance.  http://www.prc68.com/I/HP4328A.shtml

Another way to measure resistance of a battery is with an amp meter displaying
Flash Amps  http://www.prc68.com/I/No6.shtml#FA
but that may not be a good thing to do to a strong super cap.

Does anyone know of a super cap rated for delivering more than memory backup
currents that's available?

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Brooke Clarke
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2008\04\26@175915 by Jinx

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> Does anyone know of a super cap rated for delivering more than
> memory backup currents that's available?

http://www.maxwell.com/ultracapacitors/products/index.asp

http://www.maxwell.com/ultracapacitors/technical-support/white_papers.asp

http://www.maxwell.com/pdf/uc/white-papers/power_electronic_applications.pdf

2008\04\26@193230 by Sean Breheny

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Hi Brooke,

Looking at Digikey's site, it looks like there is a shift in
technology around 1 Farad which results in much lower esr. However, I
did find this:

http://www.avxcorp.com/docs/Catalogs/bestcap.pdf

Digikey carries one of these, for example:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=478-3524-ND

Which is 0.4 F, 5.5V, with 0.035 ohm ESR.

Sean


On Sat, Apr 26, 2008 at 5:41 PM, Brooke Clarke <brookespamKILLspampacific.net> wrote:
{Quote hidden}

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