Re: Terry's DRSSTC - Class of Operation?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

Hi Terry,
          I'd hazard a guess that what you're really achieving is
keeping the output terminal at a relatively high voltage requiring
less energy/shot to get it to breakout voltage. You can actually
calculate how much energy per shot is going into those discharges by
calculating a percentage loss from the scope waveforms and doing a
bit of algebra.

Malcolm

On 1 May 2005, at 17:01, Tesla list wrote:

> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi Malcolm,
>
> At 03:39 PM 5/1/2005, you wrote:
> >Hi Terry,
> >           You're heading towards CW operation (some way to go yet
> >though). That first picture appears to be without a significant
> >output discharge (maybe air streamers only?)
>
> They are all air streamers about 1++ foot long.
>
> >- the rings will
> >disappear a lot faster when the coil connects with something. I'm not
> >sure how new this really is.
>
> Some streamers are long others short.  It depends on where the last
> streamer's ringdown is at and if it syncs up with the next.  If the
> next streamer is in phase with the ringing of the secondary, the
> streamers are very long.  If they are out of phase, the streamers are
> very short.  It almost seems like an out of sync pulse can suck the
> streamer arc path dry.  Sort of poisons the streamer....
>
> >I found it was quite possible to achieve
> >even closer-to-CW operation (Like virtually no sag between bangs with
> >bangs just several cycles apart) with a disruptive coil using a
> >MOSFET gap timed to sub-uS tolerances.
>
> Cool!!
>
> >That was without any discharge
> >of course and also at much lower power than you are running. I came
> >across some scope photos of those expts while wading through a pile
> >of shots looking for the Marx-related pics I promised I'd dig out.
>
> Neat!
>
> It seems like when the BPS rate is very high, so the secondary still
> has substantial energy in it when the next bang occurs, one can time
> and sync the next cycle to last to really get the streamer length up!
> I am hoping that the streamers will be much longer in that case than
> we normally expect!  The controller is programmed now to go to full
> power >:))  Just have to wait for the stupid snow to dry off...
>
> Parallax has a new processor (BS2px) that is fully compatible and runs
> 60% faster.  This may be useful in getting the BPS rate above one's
> hearing.  Around 3000 BPS is really obnoxious on one's nerves!  But at
> 6000 BPS it just pleasantly cracks.  I need to think about modifying
> the controller I have for LCD display and all too.  The super computer
> version would be a whole new controller...
>
> There is a load of fun to be had controlling streamers at the uS level
> ;-)))
>
> Cheers,
>
>          Terry
>
>
> >Malcolm
> >
> >On 30 Apr 2005, at 23:00, Tesla list wrote:
> >
> > > Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > Hi All,
> > >
> > > Now here is a heavy thing!!!
> > >
> > > DRSSTCs, being totally electronic, can run at super high BPS
> > > rates... So fast, that the previous bang never rings down, and
> > > "VERY significantly" contributes to the next bang:
> > >
> > > http://drsstc.com/~terrell/pictures/2940BPS-01.gif
> > >
> > > http://drsstc.com/~terrell/pictures/2940BPS-03.gif
> > >
> > > http://drsstc.com/~terrell/pictures/2940BPS-04.gif
> > >
> > > These are "just" at 2940 BPS...  I can now run at 6000+ BPS...
> > >
> > > The limit here is the 125uS the Basic Stamp 2p micro-controller
> > > takes to process instructions....
> > >
> > > I think the "Rabbit" micro-controllers can control the pulse
> > > timing in the sub 1uS range!!!
> > >
> > > http://www.rabbitsemiconductor.com/products/rcm3600/rcm3600.pdf
> > >
> > > Thus, one can totally control "each pulse"...  Both T1 and T2 can
> > > be controlled "on-the-fly":
> > >
> > > http://drsstc.com/~terrell/notes/DRSSTC-Timing-Chart-01.gif
> > >
> > > BPS may be meaningless now since the controller "can" control
> > > everything "bang-to-bang".  Adjusting and optimizing for IGBT
> > > current, IGBT temperature, set point, streamer length,.... in
> > > "real time"... The coil may no longer have "bangs", but just be
> > > "pulse width modulated" at your whim...
> > >
> > > This, of course, opens up a "can of worms" trying to explain
> > > things and defining things...  I had to redo my program, but first
> > > had to come up with this chart:
> > >
> > > http://drsstc.com/~terrell/notes/DRSSTC-Timing-Chart-01.gif
> > >
> > > I think it defines the variables needed "now" pretty well to do
> > > the programming....
> > >
> > > My BS2p program is here (just open it as a plain text file):
> > >
> > > http://drsstc.com/~terrell/notes/DRSSTC-107exp.bsp
> > >
> > >
> > > But the issue is, things are changing!!!
> > >
> > >
> > > We must prepare for a whole new set of definitions and ways of
> > > running Tesla coils!!!  The days of "fully electronic" Tesla coils
> > > being controlled by 50MHz micro-processors is almost upon us!!
> > > And those darn DRSSTCs are a force to be reckoned with :o))))
> > >
> > > http://www.stevehv.4hv.org/mag2-4-30-05/spark6.JPG
> > >
> > >
> > > The World of Tesla coiling is "different" now....
> > >
> > >
> > > Cheers,
> > >
> > >  Terry
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
>
>
>