[TCML] Solid state efficiency, was: mini Tesla coil specs
Ken or Doris Herrick
kchdlh at sonic.net
Sun Nov 15 15:55:37 MST 2009
This is getting curiouser & curiouser. I've now simulated a spark load:
50 us duration & into 10K to gnd. Using secondary feedback to establish
oscillation as I have been doing, and the non-resonant primary,I find I
get a whopping primary-current surge during the spark event.
Surprise, surprise!...that's from the (to be expected, dummy!) big
glitch in secondary current.
/However/... As I recall from my first experience some years back, I
noticed no such surge; checking the secondary's return-current on the
scope; there was essentially no change. Perhaps 10K is too low an
impedance for the spark? So...I increase it to 100K with a mouse-click
or 2 and find a negligible glitch during the "spark". So what's the
better simulation of spark impedance, I wonder?--10K or 100?
-------- Original Message --------
Subject: Re: [TCML] Solid state efficiency, was: mini Tesla coil specs]
Date: Sun, 15 Nov 2009 13:43:44 -0800
From: Ken or Doris Herrick <kchdlh at sonic.net>
To: Tesla Coil Mailing List <tesla at pupman.com>
So almost immediately...a follow-up: Belatedly I thought to resonate
the primary & try it again. This time, a) the current's a sine-wave all
the way; but b) switching /starts out /near current/ /z.c/./ and after
about 4 cycles it's shifted to current-peaks, where it stays. The
current is, of course, a lot greater due to the series-resonance,
causing the secondary's output to rise faster.
But a) where's the advantage, if switching drifts toward current-peak.
And b) how to handle the greater current? (Bigger hardware, that's how!)
And finally: Whichever way one goes, it seems as if one will have to
put up with switching near current-peaks--unless one can produce the
spark within the 1st 4 cycles or so in a DR design. I haven't simulated
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