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Re: ESL in MMC`s
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi Finn,
There is this:
http://www.elecdesign.com/Articles/Index.cfm?ArticleID=1822&pg=1
However I am not sure abut the "Q".
If the inductance is say 100nF and the
capacitance is 10uF with 0.02 ohms then the Q is:
Q = SQRT(L / C) / R = 5
So there is a chance the Q would be real low and
the waveforms might be hard to pick out.
There is this:
http://emcesd.com/tt020100.htm
http://www.mwrf.com/Articles/ArticleID/5450/5450.html
"Maybe" this will help.
Cheers,
Terry
At 05:20 AM 8/13/2006, you wrote:
All,
I am building a MMC for an OLTC. This MMC is
designed to last, so it is getting quite bulky.
Any extra inductance outside of the primary coil
loop is basically unwanted, but in a High C,
Low L, Low V coil it can get *very* unwanted,
because of it`s influence on the resonant
frequency of the primary circuit. It is entering
a LC circuit where the inductance is only 350µF.
I am therefore going to measure the Resonant
Frequency of this cap, and calculate the
Inductance according to 4*pi^2*F^2*L*C=1
I assume that the resonant frequency is due to
the known Capacitance and the sum of
inductances. These inductances being: Inductance
internally in the cap, and inductance of the leads from the signal generator.
What I am asking is this:
How do I exclude the inductance of the leads
from the signal generator from the measurement?
I will post pictures of the cap as soon as it is completed.
Cheers, Finn Hammer
The capacitor is made from 99pcs.
Cornell Dubilier 940C12W1P5K-F caps in a 33/3
configuration for 16.5µF @ 3600VDC/1500VAC Ipeak=21100A Iavg=478.5A