Re: [TCML] Solid state efficiency, was: mini Tesla coil specs

[Ken or Doris Herrick <kchdlh@xxxxxxxxx>]

I've added some waveforms to http://drop.io/kch_ring_brg that might be 
of interest.  Image wave1...etc. shows my simulated double-resonant 
secondary voltage, wave2 the single-resonant voltage and wave3 the 
waveforms of primary current and MOSFET voltage for both cases.  Nothing 
changes between the DR & SR cases except adding a 180 nF capacitor in 
series with the primary, to resonate 11 uH.

I note 5 things:  1.  Secondary voltage during the "spark" event is much 
less in the SR case (and I remember noting a very low voltage when my 
old SR coil was running).  2.  The DR voltage reaches ~400 KV in 50 us 
whereas the SR case takes ~3x as long.  3.  The % increase in primary 
current during the "spark" is about the same in both cases.  4.  The 
"notches" (as I think they're called) observable in the DR secondary 
wave are not as deep as I might have expected.  5.  That messiness in 
the DR MOSFET voltage during the spark event is the MOSFET being pulled 
out of conduction by excess current; its 25V drive during that time is 
unaffected.

...would that running hardware was no more than 10x as difficult as 
simulation!  I'd take 100x.

KCH

-------- Original Message --------
Subject: 	Re: [TCML] Solid state efficiency, was: mini Tesla coil specs
Date: 	Sun, 15 Nov 2009 14:55:37 -0800
From: 	Ken or Doris Herrick <kchdlh@xxxxxxxxx>
To: 	Tesla Coil Mailing List <tesla@xxxxxxxxxx>



This is getting curiouser & curiouser. 
KCH

[SNIPPED]
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