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Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
As a part of my ongoing endavour to produce insanely high voltages I put this thing together last night:
It's a 9 stage CW consisting of 1nF 10kV capacitors and 15kV diodes, with all the conections covered up with brass spheres. I hope that this will limit conrona enough so I can run it in air. Not tested yet for lack of a suitable high voltage source - a flyback is going to produce much more than 7kV rms and therefore will immediately blow the capacitors. I think I'll also want more current than a flyback can reasonably supply, so I'll probably wind my own transformer for this. If only I could get my halfbridge or ZVS driver to work.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
good point Sulaiman, thi would just save me time winding the transformer. I suspect I might be better of redoing the wohe thing for 30kV per stage though, I think efficiency is going to suck with so many stages.
A MOT is going to be no good for this, at 50Hz I might be able to put 800mW through the CW if I am lucky, but not the 800W the MOT is rated for.
EDIT: I got the thing working now, I am using a single-layer secodary on a flyback core, driven by the ZVS circuit. I get more than 5cm arcs out, which I think is pretty much the maximum I will ever get from this. Now I just need to put more power through this, so I can use it to charge up my Marx gen.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
One month later... Cut down to three stages rated at 30kV each, this provides for a much better throughput of power. Driving with a flyback of 10kV rms or so, it produces an estimated 2*3*1.4*10kV= 80kV.
I had to increase the space between the components as I had corona actually kill on of mz capacitors. The red thing, btw, is a water resistor to protect the diodes.
Pictures:
Overhead sheet placed on the topload (negative polarity) and grounded wire near it. Surface tracking distance is a total of more than 20cm back and forth.
Another shot, two second exposure:
new OHP sheet, after the first one got punctured. Still I am impressed how much voltage they can stand.
Oh, and a funny side node: After I had switched the generator off and discharged all the capacitors, I picked up the OHP sheet because I wanted to see if it was still charged. It was! A bright, nested flash extended something like 10cm around my thumb and index finger, and discharged the surface charge with a painfull snap. Wow! Even after that, the sheet had still enough charge that when I placed aluminium foils on both sides, they were charged up to several kV and I could discharge them with a small bang. Fun!
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Unexpected capacitors can be fun and VERY painful dicoveries. I had the glass of a 60w light bulb charge up enough that my arm tiwtched when it discharged into my thumb.
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Cockroft-Walton on a budged [ressurected - new pictures]
Wouldn't that possibly result in his death?....