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Liquid Al Capacitor & Dissipation factor

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Sebez

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Hi,

I asked about the dissipation factor. This one is expressed by the following expression: DF = Rs x w x Cs
where :
Rs : equivalent serie resistor
Cs : capacity

Now, we know that the Rs and Cs decrease with frequency in Al capacitor.

So I would like to know why the dissipation factor increase ???!!!

Thanks for your answer.

Sebastien
 

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  • C and ESR vs frequency.png
    C and ESR vs frequency.png
    51.9 KB · Views: 117

Just with an additionnal information (because I know that w increase ;) )

Why the dissipation factor increase with a non linearity form (exponential form) ???!!!
 

Electrolytic capacitors are made with their "plates" rolled up, so they have inductance associated with them. At 10Mhz an electrolytic will be an inductance. For wide band use, electrolytic capacitors have a disc capacitor wired across them so they have a low impedance to 100's of Mhz.
Frank
 

Hi Frank,

thanks for your reply but it doesn't answer to my question.
I don't talk about 10MHz frequency (where, in fact, the inductance play its role) but 10KHz!..

So why the dissipation factor increase in an exponential form while R and C decrease ( \to see picture on the first message) and DF = R.C.w (linear form a priori)

Sebastien
 

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