Captret - Capacitor and Electret

[blueplanet]

You are right, I forgot, that the C capacitance will decrease and that is
why the voltage rises, but as the voltage goes into the energy formula as square
Energy= 0.5 x C x V^2
I guess this nonlinearity can be used to still generate power this way via
heating such caps.

I hope so. I fear that this energy gain has been translated into a temperature rise in a capacitor.

If this is the case, we would most likely gain thermal energy rather electrical energy. After cooling down the capacitor to room temperature (i.e. the thermal energy leaves the capacitor), we end up with nothing.

[hartiberlin]

I hope so. I fear that this energy gain has been translated into a temperature rise in a capacitor.

If this is the case, we would most likely gain thermal energy rather electrical energy. After cooling down the capacitor to room temperature (i.e. the thermal energy leaves the capacitor), we end up with nothing.

I think you did not understand the principle.

We don´t let it cool down again, it will be always heated and thus it will always convert heat energy
to electrical energy...

[hartiberlin]

@ibpointless2,
thanks for your verification.
Do you know, which dielectricum material your caps have ?

Try to get a few big ones with Y5V.

Regards, Stefan.

[hartiberlin]

If somebody has a storage scope,
please do following test:

Take also 10 x 100 nF Y5V material caps in parallel and charge them up to 10 Volts
from a DC power supply.
Then use a 100 Ohm resistor and discharge the 10x 100 nF capbank via this 100 Ohm resistor
and record the voltage pulse at the resistor with the storage scope.

Now repeat the same task, but after you have charged up the 10x 100 nF capbank
to 10 Volts, just use a hairblower to heat them up and this way charge the
capbank up to 30 Volts.
Then again use the 100 Ohm resistor and record via the storage scope
the discharge voltage curve.

Now then let us compare these 2 scopeshots.

WHich scopeshot does have more area under the voltage discharge curve ?

Theory says, the areas should be equal, but I doubt this.

Unfortunately I don´t have s storage scope yet..


P.S: You can also use a 12 Volts battery to charge it up this way to 12 Volts to start with,
if you don´t have a 10 Volts DC source..
Regards, Stefan.

[blueplanet]

I think you did not understand the principle.

We don´t let it cool down again, it will be always heated and thus it will always convert heat energy
to electrical energy...

NTC capacitor is probably what you need. It may work. But as I said, this technology is actually being used in satellites.