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Registered Member #1621
Joined: Tue Aug 05 2008, 05:26AM
Location:
Posts: 19
Attached pdf is an idea I had to use triggered sparkgaps to force wave erection in a Marx generator. The schematic shows a 4 stage generator. (You will need to see the schematic to follow what I'm about to say) Here's how I see it working: 1/ Assume the triggered gaps are of the assymetric field distortion variety - the trigger electrode capacitively couples to the other two, trigger closer to the 'upper' electrode in the sch 2/ A suitable trigger pulse fires the first gap SG1, connecting nodes A and B 3/ Nodes B,D and F rise to +kV (assuming no stray C to ground - in reality there is stray C, but this only makes things better ) 4/ Nodes C and E rise to 2 x kV 5/ Because C rises fast to 2 x kV, while SG2's trigger stays at +kV there is effectively a trigger pulse applied between SG2's trigger and its 'C' connected terminal 6/ SG2 fires, cycle continues ....
It occured to me to do this when I was trying to figure out why the upper gaps in a marx would fire, and realised it relied on stray capacitance to ground and/or UV coupling between gaps. This kind of 'random' engineering irks me somewhat and so this concept was born.
Comments? Please feel free to shoot me down.
BTW I have parts enroute for my first Marx build (30x 30kV,500p caps), so I will eventually try this concept out.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
the trigger electrode capacitively couples to the other two, trigger closer to the 'upper' electrode in the sch
It occured to me to do this when I was trying to figure out why the upper gaps in a marx would fire, and realised it relied on stray capacitance to ground
Just noticing the similarity here. I too came to the conclusion is mostly depended on stray C.
I do see your reasoning i think, but im not sure if it looks any "better" or not than the typical marx generator setups you see on the net.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Yes, stray capacitances hold one side of each successive switch near ground until the switch fires.
For a brief outline of the wave erection Marx operation, see:
MARX GENERATOR DESIGN AND PERFORMANCE W. J. Carey and J. R. Mayes Applied Physical Electronics, L.C. PO Box 341149, Austin, Texas 78734
The practical techniques for achieving wave erection are described here:
SUB-NANOSECOND JITTER OPERATION OF MARX GENERATORS J. R. Mayes, W. J. Carey, W. C. Nunnally, L. Altgilbers Applied Physical Electronics, L.C. Austin, Texas 78734
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Wave erection of Marx using triggered gaps
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