# Is this actually an ultracapacitor?

G

#### Glenn

Jan 1, 1970
0
(Aswer to: nntp://sci.electronics.components )

Is this actually an ultracapacitor? - it must be an accumulator?:

American Institute of Physics (AIP) (2012, July 19). New ultracapacitor
delivers a jolt of energy at a constant voltage. ScienceDaily:
http://www.sciencedaily.com/releases/2012/07/120719103225.htm
Quote: "...
The novel constant-voltage design, which may one day help
ultracapacitors find new uses in low-voltage electric vehicle circuits
and handheld electronics, is described in the American Institute of
Physics' Journal of Renewable and Sustainable Energy.
....
So Bakhoum has designed an ultracapacitor that maintains a near-constant
voltage without a DC-DC converter.
...."

Because:

C=dQ/dV

Or?

br,

Glenn

S

#### Syd Rumpo

Jan 1, 1970
0
(Aswer to: nntp://sci.electronics.components )

Is this actually an ultracapacitor? - it must be an accumulator?:

American Institute of Physics (AIP) (2012, July 19). New ultracapacitor
delivers a jolt of energy at a constant voltage. ScienceDaily:
http://www.sciencedaily.com/releases/2012/07/120719103225.htm
Quote: "...
The novel constant-voltage design, which may one day help
ultracapacitors find new uses in low-voltage electric vehicle circuits
and handheld electronics, is described in the American Institute of
Physics' Journal of Renewable and Sustainable Energy.
...
So Bakhoum has designed an ultracapacitor that maintains a near-constant
voltage without a DC-DC converter.
..."

Because:

C=dQ/dV

Or?

br,

Glenn

Energy stored is E = 0.5 C*V^2 so 2E/C = V^2

As the energy is 'used up' then C is reduced mechanically to maintain V
constant. I guess the system monitors V and moves the plates as necessary.

Cheers

M

#### MrTallyman

Jan 1, 1970
0
(Aswer to: nntp://sci.electronics.components )

Is this actually an ultracapacitor? - it must be an accumulator?:

American Institute of Physics (AIP) (2012, July 19). New ultracapacitor
delivers a jolt of energy at a constant voltage. ScienceDaily:
http://www.sciencedaily.com/releases/2012/07/120719103225.htm
Quote: "...
The novel constant-voltage design, which may one day help
ultracapacitors find new uses in low-voltage electric vehicle circuits
and handheld electronics, is described in the American Institute of
Physics' Journal of Renewable and Sustainable Energy.
...
So Bakhoum has designed an ultracapacitor that maintains a near-constant
voltage without a DC-DC converter.
..."

Because:

C=dQ/dV

Or?

br,

Glenn

Looks pretty good at first glance, but I didn't linger long as I have
to go to work soon.

L

#### legg

Jan 1, 1970
0
(Aswer to: nntp://sci.electronics.components )

Is this actually an ultracapacitor? - it must be an accumulator?:

American Institute of Physics (AIP) (2012, July 19). New ultracapacitor
delivers a jolt of energy at a constant voltage. ScienceDaily:
http://www.sciencedaily.com/releases/2012/07/120719103225.htm
Quote: "...
The novel constant-voltage design, which may one day help
ultracapacitors find new uses in low-voltage electric vehicle circuits
and handheld electronics, is described in the American Institute of
Physics' Journal of Renewable and Sustainable Energy.
...
So Bakhoum has designed an ultracapacitor that maintains a near-constant
voltage without a DC-DC converter.
..."
Might be interesting to charge at low voltage (available) and
discharge at a higher voltage (usable)........

Claims to have compensated at a 35W / 6A dischage rate, mechanically.

RL

L

#### legg

Jan 1, 1970
0
(Aswer to: nntp://sci.electronics.components )

Is this actually an ultracapacitor? - it must be an accumulator?:

American Institute of Physics (AIP) (2012, July 19). New ultracapacitor
delivers a jolt of energy at a constant voltage. ScienceDaily:
http://www.sciencedaily.com/releases/2012/07/120719103225.htm
Quote: "...
The novel constant-voltage design, which may one day help
ultracapacitors find new uses in low-voltage electric vehicle circuits
and handheld electronics, is described in the American Institute of
Physics' Journal of Renewable and Sustainable Energy.
...
So Bakhoum has designed an ultracapacitor that maintains a near-constant
voltage without a DC-DC converter.
..."

Because:

C=dQ/dV

Or?

br,

Glenn

Might be interesting to charge at low voltage (available) and
discharge at a higher voltage (usable)........

Claims to have compensated at a 35W / 6A dischage rate, mechanically.

RL

F

#### Fred Abse

Jan 1, 1970
0
Energy stored is E = 0.5 C*V^2 so 2E/C = V^2

As the energy is 'used up' then C is reduced mechanically to maintain V
constant. I guess the system monitors V and moves the plates as
necessary.

Which requires energy input to move the plates, else conservation of
energy, and/or conservation of charge is violated.

Here we go again... ;-)

T

#### Tim Williams

Jan 1, 1970
0
.... Also, I'm reminded of playing with my Eico 377 signal generator (classic
Wien bridge, dual air variable cap). On the lowest frequency band, it's
kind of unstable (it's working with ~10M resistors!), and has a long time
constant, so it's easy to make it 'bounce'. Set it for a low frequency and
wait for it to stabilize, then yank the dial up to a high frequency.. the
waveform overshoots, rebounds and stabilizes. Or dial it up slowly, and the
amplitude tracks higher than normal until you stop.

If drive power is supplied by the stored electricity, then it's just a
capacitive transformer -- nothing wrong with that, and saves the difficulty
of a wide range electrical converter.

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

(Aswer to: nntp://sci.electronics.components )

Is this actually an ultracapacitor? - it must be an accumulator?:

American Institute of Physics (AIP) (2012, July 19). New ultracapacitor
delivers a jolt of energy at a constant voltage. ScienceDaily:

http://www.sciencedaily.com/releases/2012/07/120719103225.htm

So Bakhoum has designed an ultracapacitor that maintains a near-
constant voltage without a DC-DC converter. The ultracapacitor is
fitted with an electromechanical system that can slowly lift the core
of the device out of the electrolyte solution as the stored charged is
released. As the electrolyte drains away, the device can hold less
charge, thus lowering, its capacitance. Since the voltage of the
capacitor is related to the ratio of the stored charge to the
capacitance, the system maintains a steady voltage as charge is
siphoned off.

Bakhoum built and tested a prototype of the new ultracapacitor. After
attaching a 35-watt load to the device, he found he could successfully
program the voltage to stay within a 4.9 to 4.6 volt range. Testing
also showed that the constant-voltage mechanism operates with a 99
percent efficiency or higher. The lifetime of the electromechanical
motor is expected to be about the same as the lifetime of the
ultracapacitor's core, Bakhoum writes.

L

#### legg

Jan 1, 1970
0
Reminds me a bit of a (fictional) invention in Smith's "Venus
voltages. He developed an insulating liquid with a ferociously high
dielectric constant. He used it to fill the spaces between the plates
in a capacitor, charged up the cap to a thousand volts or so... and
then drained the liquid. Zowie!

RL

F

#### Fred Abse

Jan 1, 1970
0
Reminds me a bit of a (fictional) invention in Smith's "Venus Equilateral"
stories. A semi-mad scientist had a need for really high voltages. He
developed an insulating liquid with a ferociously high dielectric
constant. He used it to fill the spaces between the plates in a
capacitor, charged up the cap to a thousand volts or so... and then
drained the liquid. Zowie!

Which begs the question: would the liquid drain. Think electrostatic
attraction.

My guess is that it would need to be pumped. Inputting energy again.

J

#### John Devereux

Jan 1, 1970
0

The Venus Equilateral stories (well, most of them) were written
between 1942 and 1945. I think the "ultra-high-dielectric-constant
liquid" made its appearance in the story "Firing Line" (1944) but it
might have occurred earlier than that... it's been a few years since I

The stories are collected in "The Complete Venus Equilateral", and are
well worth reading... they portray a bunch of RF/EE types, managing a
"communications relay satellite station" full of high-power vacuum
tube transmitters (this was pre-transistor stuff... "Now we're cooking
with glass!"), orbiting the sun at Venus's L4 point. Fun stuff, with
a good dash of humor.

I don't think it's in print at the moment, but used copies are
available.[/QUOTE]

Ha ha I remember that from my childhood (reprint I guess - not the 1940's!).

One story they made a matter transmitter from a scaled-up tunnel diode
IIRC.

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