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RE: How does capacitance change with voltage?

Posted by rick_m (A) on July 2, 2007 at 08:31:52

In Reply to: RE: How does capacitance change with voltage? posted by John PA on July 1, 2007 at 18:04:45:

Hi,

I'm not quite sure what your concern is. However as already posted the capacitance is basically constant with voltage.

The amount of power stored goes up with V^2 so if you run it at twice the voltage, it's got four times the energy available. Naturally you must stay under the rated voltage.

As far as peak current goes, it's mostly limited by the ESR (effective series resistance) of the Cap. Nowadays that specification is getting a lot more attention than it used to and many capacitors are being designed to optimize it. You can thank switching power supplies for this as the ESR of the Caps. is a major loss factor.

So if you want to store more energy, increase the capacitance or voltage.
If you want more peak current, use capacitors with low ESR and consider running several in parallel.

Good luck, Rick

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