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Re: [TCML] Solid state efficiency, was: mini Tesla coil specs]
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
that yet.
Comments?
KCH
-------- Original Message --------
Subject: Re: [TCML] Solid state efficiency, was: mini Tesla coil specs
Date: Sun, 15 Nov 2009 13:19:09 -0800
From: Ken or Doris Herrick <kchdlh@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
References:
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<cc2218e80911130718k750de578t197b1d7d7677aaa9@xxxxxxxxxxxxxx>
<4AFDCA69.4090001@xxxxxxxxx>
From KCH-
While I have the attention of a few s.s.'ers here, perhaps someone can
shed light on this: I'm simulating what amounts to a half-bridge
driving an untuned-primary t.c. I record waveforms of a) MOSFET current
and b) primary current. I notice the following: At the start, the
MOSFETs switch at current peaks and the current waveform is triangular.
As the primary current--and secondary voltage, of course--builds up, the
current waveform gradually changes toward a sine shape and the switching
events shift toward current-zero-crossing. I have a feeling that that's
the case in the real world. Is that to be expected?
KCH
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