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Re: [TCML] Primary LC efficiency



Chris,

I'm not going to try to get into all of the math, as that's
WAY out of my league, but you will get varying opinions
on more primary L vs. more primary C. More primary
C allows for bigger bangs, which is good, but also increase
the gap losses, which is bad. More primary L will give
inverse results to more primary C. I think most of us
agree that you can go with with a relatively small primary
capacitor and a relatively large primary coil inductance
and increase the BPS rate to overcome the limitations
of the smaller bangs and still take advantage of the lower
SG losses, which is the major source of power losses, and
the higher Qs. I'm not sure if there is a good "black or white"
answer to your question. It all comes down to a balancing act
and what your specific desires/needs are.

David Rieben


----- Original Message ----- From: "Chris Swinson" <list@xxxxxxxxxxxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, August 25, 2008 4:35 AM
Subject: [TCML] Primary LC efficiency


Hi all,

I was wondering if there is any advantage in an LC circuit to gain better efficiency by either using more C or more L.

As a rough idea, maybe 10uH 10nF, or 20nF 5uH, or 5nF 20uH type of arrangement.

Going by capacitance is normally the evil, a higher L figure would give a higher Q ?

The problem with higher inductance is higher resistance which lowers Q also.

From one of my number crunching sessions, resistance goes up with
inductance. It seemed pointless going for higher inductance as the extra resistance of the cable would counteract the gains in inductance. However if you can increase the inductance without increasing the resistance then it would seem a good way to go.

Then comes the LR vs C of the primary, C seems the evil so a higher inductance would be better. However if the wire dia is kept the same, then resistance wise, going for a higher L could be bad.

So overall, there does not seem to be any real way to improve primary efficiency ?

Cheers,
Chris

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