Re: [TCML] Primary LC efficiency

["DC Cox" <resonance@xxxxxxxxxxxx>]

Yes, Rich Hull with his interesting experiments during the early 90's has
shown us using a bit more inductance is better due to the surge impedance
factor.
I usually shoot for approx 6-10 turns with an NST type coil and 5-8 turns
with a large pole xmfr type coil.

Using a slightly higher value inductance reduces some strain on the
capacitor.

Solid state coils seem to prefer the opposite --- a bit more capacitance and
a bit less inductance.
Many solid state and IGBT driven type coils use 2-4 or 5 turns for best
performance. (probably due to the lower
buss voltage).

Dr. Resonance





On Mon, Aug 25, 2008 at 3:35 AM, Chris Swinson <
list@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

> 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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