 New Type of SGTC?
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Terry Fritz
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Registered Member #393
Joined: Tue Apr 18 2006, 12:30AM
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Posts: 297
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One of the (related) thoughts I had a little while ago was to use Terry's SISG as the basis for an "off-line" Marx generator, operating at voltages below where a SG-based Marx could operate. Such a thing might be the basis for an OLTC.
One would have to be careful of the current. It would be very nice to keep the IGBT current bellow 800 amps. Also, when the thing fires, the dI/dT would need to be slow enough for the SISG sections to turn on normally. Adding an "inductor" would fix all that  Just like a Tesla coil primary.
EVR brings up a good point about the "BPS". Less than say 120BPS might really begin to hurt the output spark length. If say inductors instead of resistors could be used, that might not be a problem..
Using inductors in the MARX strings might cause unwanted oscillations. Resistors burn up, but I had major problems at first trying to use inductors for current limiting in early SISG coils due to them oscillating with the main cap in all the wrong ways...
It might be possible to use fairly low value resistors (runs cooler). Their value would still have to be higher than the primary system impedance by say 10X.
Cheers,
Terry
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