Re: IGBT SSTC finally possible?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Mitchell" <Electrontube-at-sbcglobal-dot-net> 

There is such thing as full wave rectified AC,  excuse my improper use of
the term.

You're basically saying the same thing I am...  I'm not arguing what CW is,
I'm saying that the faster on and off of the ISSTC is one of the reasons it
has such large sparks.  If Steve turned the interuptor to always on,  I bet
he'd get small bushy sparks.

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, April 24, 2004 7:20 PM
Subject: Re: IGBT SSTC finally possible?


 > Original poster: "Eastern Voltage Research Corporation"
<dhmccauley-at-easternvoltageresearch-dot-com>
 >
 > Firstly, there is no such thing as half-wave DC or full wave DC.
 > Again, any signal that you feed into your full-bridge chopper that is not
 > pure DC results
 > in a non-CW type SSTC.  Whether its a smooth sine wave, triangle wave,
 > pulsed DC as in
 > Steve's ISSTC, etc..., it is NOT CW.
 >
 > Even those smooth sine waves as you say, turn on quick enough wave by wave
 > to cause a steep
 > RF envelope and allow big arcs.  CW on the otherhand has a continous RF
 > envelope resulting in
 > a short-length bushy discharge which is the ideal waveform for audio
 > modulated coils as it is
 > very quiet.
 >
 >
 >
 >
 >  > Yes but Steves *INTERUPTED* Solid State Tesla Coil is not continuous,
it
 > is
 >  > different as it is interupted rather then running off half wave DC or
full
 >  > wave DC, those have a smooth sine wave, instead of the quick on and off
 >  > pulses that the interuptor does in the ISSTC.
 >  >
 >  > Regards - Jim Mitchell
 >  > ----- Original Message -----
 >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  > To: <tesla-at-pupman-dot-com>
 >  > Sent: Saturday, April 24, 2004 12:52 PM
 >  > Subject: Re: IGBT SSTC finally possible?
 >  >
 >  >
 >  >  > Original poster: "Eastern Voltage Research Corporation"
 >  > <dhmccauley-at-easternvoltageresearch-dot-com>
 >  >  >
 >  >  > Just to clarify, the normal SSTC is NOT a CW mode SSTC.
 >  >  >
 >  >  > The PlasmaSonic (audio modulated) is a CW type SSTC.  CW requires
pure
 > DC
 >  > on
 >  >  > the rails and output discharge is
 >  >  > very quiet, brushlike, and very short (usually 2-3 inches)
 >  >  >
 >  >  > Most of the "normal" or "atypical" SSTCs use a full-bridge with some
 > type
 >  > of
 >  >  > non-DC waveform such as half-rectified AC, full-rectified AC, etc...
 >  >  >
 >  >  > A CW SSTC or CW VTTC would be like Sue Gaeta's audio modulated SSTC
or
 > my
 >  >  > Plasmasonic audio modulated system.
 >  >  >
 >  >  > Dan
 >  >  >
 >  >  >  > Folks the ISSTC is a TOTALLY different beast, as well as the
DRSSTC
 >  > from
 >  >  > the
 >  >  >  > normal CW SSTC.
 >  >  >  >
 >  >  >  > The IGBTs are not the reason why the ISSTC works, or why the
DRSSTC
 >  > works.
 >  >  >  > If you go back and look you'll see that Steve was using MOSFETs
 > before
 >  > he
 >  >  >  > added the tuned primary.
 >  >  >  >
 >  >  >  > If you read a bit on IGBTs, some will say that they incorporate
the
 >  > best
 >  >  > of
 >  >  >  > MOSFETs with the best of Bipolar Transistors, as they have a low
 >  >  > dissapation
 >  >  >  > compared with MOSFETs which dissapate more power.
 >  >  >  >
 >  >  >  > Back "in the day" I believe IGBTs were used mostly in industrial
 > motor
 > msnip........
 >
 >