Re: How could a pulse cap operate in TC?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

The dissipation factor is conductivity/(2*pi*f*permitivity) and for 
most dielectrics,  conductivity is a function of frequency.  The 
ratio conductivity/(2*pi*f*permitivity), however, is fairly constant 
over frequencies of interest.  For example, mica has a dissapation 
factor of 0.0002 at audio or RF frequencies.  The dissapation factor 
is sorta like power factor (they differ by less than a percent) for 
factors less than 0.15.

ref: Electromagnetic Waves and Radiating systems by Jordan Balmain 
(Prentice Hall second edition)

> Original poster: father dest <dest@xxxxxxxxxxx>
>
>
>  > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
>  > Trise = Power dissapation (watts) * Thermal Impedance (degrees/watt)
>  > Power dissapation = Irms^2 * ESR_of_cap
>
> ESR = dissipation factor / (2 * PI * F *C)

??? This doesn't sound right.  CDE 942C20P15K caps (0.15uf) specifies 
a typical ESR of 5 milliohms

The total ESR of a cap, I believe, will be due to the ohmic 
resistance of its construction and the dielectric loss.  I believe 
Steve said that the dielectric loss was insignificant at our frequencies.

Gerry R