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How can this resistance be determined? If the resistance of the capacitor changes over time, which I'm pretty sure it does, how can I find its lowest resistance from which current is drawn?

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- Thread starter Pharrahnox
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- #1

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How can this resistance be determined? If the resistance of the capacitor changes over time, which I'm pretty sure it does, how can I find its lowest resistance from which current is drawn?

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Drakkith

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Philip Wood

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But perhaps I'm scaremongering. No doubt the circuit could be investigated with some sort of data-logger that samples voltages at very frequent intervals, and can therefore deal with very rapid charge or discharge.

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Manufactures often publish extensive amounts of data for electronic components. You can usual find an effective serial resistance.

The other option is to build a simple RC circuit and measure the decay time.

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According to this site: http://www.chemi-con.com/components/com_lcatalog/uploaded/8/3/3/48990562506224c250b19.pdf [Broken] at pg26 63V 12000μF capacitors have about 21mΩ ESR.

I have 2 of these, so I could connect them in parallel to get a total capacitance of 24mF. Since they are in parallel, does this then mean that the ESR would be halved (since there's two of them)? If so, this would mean that the maximum current would be assuming the wire (in this case acting as a resistor) resistance to be 1.4Ω, then the total resistance would be 1.41Ω, and the maximum current at 60V would be 42.55A.

However, there would be other factors that would drastically affect that value, wouldn't there? And if so, roughly how much of an affect would they be expected to have on the maximum current?

I have 2 of these, so I could connect them in parallel to get a total capacitance of 24mF. Since they are in parallel, does this then mean that the ESR would be halved (since there's two of them)? If so, this would mean that the maximum current would be assuming the wire (in this case acting as a resistor) resistance to be 1.4Ω, then the total resistance would be 1.41Ω, and the maximum current at 60V would be 42.55A.

However, there would be other factors that would drastically affect that value, wouldn't there? And if so, roughly how much of an affect would they be expected to have on the maximum current?

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