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Re: scan tesla questions

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Steve,

At 09:46 PM 7/13/2005, you wrote: 
Hi Terry,

Just some questions.

Firstly, where can i download the newest version of ScanTesla? 

http://drsstc.com/~terrell/modeling/ScanTesla740.ZIP


Secondly (i should have been paying more attention before).  Does
scantesla use primary feedback to do its simulations?  Or does it use
some other method for selecting the drive frequency?  This could be
very important.  Just wondering how the program works in that respect.

It uses primary feedback. It could easily use secondary current feedback too but I would have to change a number in a line... Let me know if you want that.


I have been playing with it more (its simpler than i first thought it
to be) and it made some suggestions about my BIG DRSSTC.  I followed
it "instructions" and it appeared to work quite well producing 128"
streamers and no 20A fuses blowing (run times over 1 minute).

Cool!! I have not played with it for the last few days. Glad to know it seems to be working ;-)

Anyway,
im finding that scan tesla's peak current predictions for my coil are
not correct (it predicted 800A, i measured 1100A).  This might be due
to a foul Rprimary input.  This run used a K of only .13, which is a
big change for my usual K=.24 type stuff!  I think this K is too low,
though, as more simulation work shows that a K of about .17-.18 seems
to have the same SERT, same bang energy, but less primary current.

It "should" do the currents fine. Rprimary is pretty important. Do you think the program is not calculating something right or there is something wrong? If there is a problem, I can check it out.

The currents seem to work out very closely to the real current for me.

Is the current transformer for the primary current rated up to 1100A ?


Hopefully i will get my boost converter done soon, then i can run 900V
on the bridge which should make things run better i think, provided
the 1200V IGBTs will allow for the 200V increase from 700VDC.  The
boost converter shouldnt suffer from "wimpy" line conditions either
;-).


Cool!

Cheers,

        Terry



Steve