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Re: Coupling vs secondary voltage chart
Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
Hi Antonio,
I am very happy to here the model predicted what was "expected"! That
shows it is probably giving good data!! Since the program is brand new, I
try to check everything every way I can to be sure it is working correctly.
R1 was 3 ohms and R2 was 391 ohms. I just copied the parameters from here:
http://hot-streamer.com/TeslaCoils/MyCoils/BigCoil/BigCoilSCH.gif
C3 was 3.83pF and R3 was 220k ohm.
I did a power analysis where I added up all the power losses vs power
inputs and it was correct to within 0.014%! I am using 100 steps per
cycle. The program can automatically default to that if the time step is
less than 0. I found 100 steps was a bit better than 50 steps. I also
found that double precision numbers make a difference (like in E-Tesla6) so
that is what I use.
It is stunning how much computers have improved in the last few
years!! For E-mail you do not notice, but that last DRSSTC model I ran did
50 trillion machine ops!! That is including my surfing the web while it
was running ;-))
The hacked version of ScanTesla I used for this is at:
http://drsstc.com/~terrell/modeling/ScanTesla6.10-KvVT-hacked.zip
I think the input file is for the DRSSTC case... Know that I have run it
once, it could run much faster if I limit the parameters to what I now know
their limits are...
Cheers,
Terry
At 05:51 PM 6/15/2005, you wrote:
Tesla list wrote:
Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
I set ScanTesla to find out how coupling affects top voltage.
I used the data from my big coil:
http://hot-streamer.com/TeslaCoils/MyCoils/BigCoil/BigCoil.htm
The coupling ran from 0.01 to 0.99 in 0.001 steps. The load was 3.83pF
calculated from the initial primary cap energy (21kV 28nF) using the
Freau formula.
The primary coil was tuned to maximum top voltage at each coupling level
to within 0.1uH. I cut the fluff out of a special optimized version of
the program so it could do 1000+ models/second! 441000 calculations (400
seconds - 1,200,000,000,000 machine cycles!) later... Here is the graph:
http://hot-streamer.com/temp/KvsVtop-BigCoil.gif
Shows the expected maxima at k=0.6, 0.38, 0.28, 0.22,..., with losses
reducing the voltage when more cycles are used for the energy transfer.
Where were the losses in the model?
Antonio Carlos M. de Queiroz