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300KV Cockroft Walton multiplier

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Mates
Sat Feb 16 2008, 05:53PM Print
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
I‘m starting a new HV project...
For my future experiments I need 300KV DC power source and here is the try to get it for low costs…
It is classical CW multiplier, based on ignition coil 50KV at 6 KHz. In fact it is just next step after the doubler which I presented here Link2 recently. The caps are home made Link2 disassembled from my old Marx generator which I’m actually trying to replace.

The diodes are stacks of 1N4007 Link2 , probably the cheapest diodes you can get (I bought 1000pc for 20$) dipped in cooking oil. So theoretically I can rectify 1milion volts… amazed

Here is a test run - two stages. Spark gap is 15cm, probably I can go much widther. The sparking rate is approx. 15 per second and sound is really loud angry . I plan at least 8 stages in the future so hopefully I’ll send more exiting picture soon…

I’ll have to think a lot how to design the 8 stages into a compact device (probaly everythnig will end up inside an oil bath). Any suggestion regarding this would be great. And of course any question and comments are welcomed…


2 Copy

3 Copy

1 Copy
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Spedy
Sun Feb 17 2008, 06:02PM
Spedy Registered Member #964 Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
Wow, that's amazing. Though I can;t see that lighter sitting in spark gap going to well lol. 300kv is alot, don't you get enough corona to fill a bunch of 2 liter bottles?
Either way, congrats. so far the only hv thingy I've gotten to work is a kit that makes like 1/2-1" sparks... lol.

How much time did you spend trying to make this thing work? So far I can;t even make a camera-flash inverter based CW multiplier work..
Anyway, hope you eventualy manage the big 1mill! Be sure to post pictures when you do! lol
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Mates
Sun Feb 17 2008, 10:34PM
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Spedy wrote ...

300kv is alot, don't you get enough corona to fill a bunch of 2 liter bottles?


You do not understand it well, 300KV is the aim which is still far away. My guess is, that with those 2 stages my final tension is little bit above 100KV. Corona does not seem to be a problem. You can check the darker picture...

Spedy wrote ...


How much time did you spend trying to make this thing work?


This project is glued of parts of my older ones. Thus, completing this thing was a quick action. Only soldering the diodes is PITA work.
Today I've made another stage with new caps which are 30% less capacitance. I plan to reduce the capacitance gradually with each next stage. I placed everything on a plastic board so it is much more compact now. With the test run I scared to death a friend of mine tongue I'll send new pictures tomorrow wink
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Shaun
Mon Feb 18 2008, 03:11AM
Shaun Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
You should really use a limiting resistor, since every time you directly short that you discharge the capacitor string through the 1A rated 1N4007s. Seems you've had no problems so far, but once you get up to higher stored energy it could be bad news for those diodes.
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Mates
Mon Feb 18 2008, 12:26PM
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Shaun wrote ...

You should really use a limiting resistor, since every time you directly short that you discharge the capacitor string through the 1A rated 1N4007s. Seems you've had no problems so far, but once you get up to higher stored energy it could be bad news for those diodes.

That's actually very good point Shaun. This is exactly the reason why I'm discussing the whole project here. Any design flaws you people notice are thankfully accepted. I didn't realize that this is not a Marx and amp peak must be really big in the diodes during discharge (It must be a good luck and gods support they are still alive cheesey ). I will use 1Mohm resistor made of 10pc of 100K/2W high voltage resistors all dipped in oil. I've been using them for my Marx and I know for sure that 3 of them in series can stand 60KV. I'm very curios how the sparks will look like with this type of limiter...
Thanks...
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Spedy
Mon Feb 18 2008, 06:01PM
Spedy Registered Member #964 Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
Ah, I see. a 300kv goal is pretty high by my standards lol.

I can understand how those diode chains can be a pain, I've burned myself numerous times trying to make a little tiny CW where all the components hardly have any leads at all >.<

Hey, what circuit are you using for the iggy coil? 50kv ac from an iggy seems kinda insane to me...
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Mates
Tue Feb 19 2008, 11:01PM
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Here is my latest progress. I made the whole device more compact and added one more stage. I also built the HV resistor as you can see on the picture.

However, despite I’m still far away from my aim I already have to deal with serious problems. The resistors works only if the spark gap is below 22cm. If I make larger gap the initial few sparks are not resistor limited (the electricity finds somehow way around). I also noticed that I have flashovers between the connection points within the device in case the spark gap is more than 26cm. This means I’ll have to built the final device differently with greater spacing or/and placing it inside an oil bath frown . I’m sending at least some sparks pictures limited by the resistor. The HV terminals are 22cm apart…


1203461998 1025 FT39162 Sg101393

1203461998 1025 FT39162 Resistor

1 Copy


and one more picture here Link2
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Kizmo
Thu Feb 21 2008, 10:27AM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
That is *really* impressive!



..You made me buy 3000pcs of 1N4007s from ebay :D (1k for me, rest are for my friend)
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uzzors2k
Fri Feb 22 2008, 07:27AM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
That's excellent Mates! I like how you used nothing but common components and household junk. Good job and keep it up!
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thermite
Sat Feb 23 2008, 03:46AM
thermite Banned on 02/27/2008
Registered Member #1326 Joined: Sun Feb 17 2008, 11:19PM
Location:
Posts: 49
I think the voltage multiplier is not called walton and cockroft.

Walton and cockroft is identical to Marx.

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