Author Topic: Marx Generator misfiring  (Read 197 times)

Offline Andy Kay

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Marx Generator misfiring
« on: May 15, 2018, 10:47:24 PM »
Hi guys, I've been busy building my first ever Cockcroft-Walton voltage multiplier and my first ever Marx Generator. I don't know if it's permitted to supply video links here but if so then I can show provide a link to a YouTube video that shows the setup. My question concerns misfiring. I'd like to understand what is happening in the Marx Generator when it occasionally misfires, with the minor spark gaps showing weak sparks (or maybe they are just plasma paths). I can't see any obvious shorting pathways, so I'm wondering where all the energy is going on the misfires. Thanks for reading.

Offline Mads Barnkob

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Re: Marx Generator misfiring
« Reply #1 on: May 16, 2018, 12:19:51 PM »
Please do post the video, if you put in a youtube link, it is automatically embedded so you can play the video directly here in the post.

Misfiring is often due to imbalance in charging resistors/inductors, but lets get a look at your setup before troubleshooting more :)
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Offline Andy Kay

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Re: Marx Generator misfiring
« Reply #2 on: May 16, 2018, 05:11:54 PM »
Please do post the video, if you put in a youtube link, it is automatically embedded so you can play the video directly here in the post.

Misfiring is often due to imbalance in charging resistors/inductors, but lets get a look at your setup before troubleshooting more :)
Thank you Mads.
The setup consists of a car battery at 13V driving a two-port CCFL inverter. One port of the inverter is driving a T5 fluorescent lamp in cold cathode mode, the other is driving a 13-stage CW voltage multiplier. I have tapped off the CW at the fifth stage to supply an 11-stage Marx generator. The gap is something like 90mm, but when I set it at 100mm the misfiring begins in earnest.

Here is the link:

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Offline Andy Kay

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Re: Marx Generator misfiring
« Reply #3 on: May 19, 2018, 07:30:29 AM »
Misfiring is often due to imbalance in charging resistors/inductors,
The resistors are all 1W 1M 1% metal film. I guess I'm really asking about the mechanism of failure when the main gap gets too large. I would have expected all the capacitors to become fully energized just as before, and so the energy should be finding some easier path than the main gap, but I don't see any evidence of that. Perhaps the capacitors aren't getting to full charge, but I don't see how that would follow from just increasing the main gap. Still perplexed.

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Re: Marx Generator misfiring
« Reply #3 on: May 19, 2018, 07:30:29 AM »

 


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