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Triggered SISG

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Finn Hammer

Thu Nov 16 2006, 09:20PM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

All,

I`ve just started a webpage with some information about the triggered SISG.

Hope it helps.

Cheers, Finn Hammer

Daniel Uhrenholt

Fri Nov 17 2006, 06:32PM

Registered Member #125 Joined: Fri Feb 10 2006, 01:52PM
Location: Aalborg, Denmark
Posts: 155

Hi Finn.

Your SISG coil is looking great!

But why is there stuff about your RAT coil on the new webpage

Some day next year I`ll drop by your house and see it in action

Cheers, Daniel

Finn Hammer

Sun Nov 26 2006, 09:42PM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

All,
In another thread, Aaron said:

J. Aaron Holmes wrote ...

Heheh....well, that means the title of "First To Blow Up An SISG" will probably be mine

Regards,
Aaron, N7OE

And in yet another thread, Terry noted:

Terry Fritz wrote ...

I note Finn has not blown any IGBTs either unlike the DRSSTC systems tend to until they are all figured out

Cheers,

Terry

But of course, I took the price:

In an attempt to get beyond 44 inches, I did something silly:

I added smoothing caps, 330ÂµF/4500V and then I hooked up a charging inductor without soldering the leads, or crimping them. Just twisted the wires together.

Well, the 2 wires of the inductor touched each other, and thus offered a free and unrestricted path for the 3341 joule residing in the smoothing caps.

That cracked the IGBT`s open. All 10 of them

I am not able to tell if the rest of the circuitry survived, but time will tell.

Cheers, Finn Hammer

ragnar

Mon Nov 27 2006, 01:39AM

Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425

**weeps with you for IGBTs**

..a moment's silence..

did you get any more spark/setup photos prior to explodage?

Terry Fritz

Mon Nov 27 2006, 11:11AM

Registered Member #393 Joined: Tue Apr 18 2006, 12:30AM
Location:
Posts: 297

Finn Wrote:

Well, the 2 wires of the inductor touched each other, and thus offered a free and unrestricted path for the 3341 joule residing in the smoothing caps.

I blew a six string too in a ball lightning experiment early on too. It was at a party and I did not think it though.

We dumped about 900J into the SISG string which shorted all the IGBTs but did no other damage.

So they can be blown due to accident or giant energy discharge. At 3341J, Finn holds the record for the most energy

Mine did not blow the IGBTs apart or anything, they we just all shorted.

So SISGs "can" be broken if one really tries hard

So far, directly discharging really big caps into them is the preferred way. I think overheating is the biggest danger in a normal situation.

Cheers,

Terry

Steve Conner

Mon Nov 27 2006, 03:05PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Don't be sad BP, it's all in the name of science

Daniel Uhrenholt

Mon Nov 27 2006, 03:16PM

Registered Member #125 Joined: Fri Feb 10 2006, 01:52PM
Location: Aalborg, Denmark
Posts: 155

Firm He-man(n) wrote ...

I added smoothing caps, 330ÂµF/4500V and then I hooked up a charging inductor without soldering the leads, or crimping them. Just twisted the wires together.

I think i heard that one before

Did this happen while testing it on the Millinium coil?

Finn Hammer

Mon Nov 27 2006, 08:13PM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

Autopsy report.

Hoping for the best and expecting the worst, I measured the components of the SISG.
The SCR`s are fried, The 24V TVS`s are fried, and the first section of the top SIDAC`s are fried. The other half of the top SIDAC, together with the 3 bottom SIDACs are the parts bypassed by the SCR, so it all makes sense.

Well, that is it then, I am not going to perform a rebuild. The 650Apri(max) restraint is not my cup of tea. I`m going to pursue my goals by stacking larger IGBT`s.

I got my 44" of spark, a lesson learned, and proof that the trigger circuit worked. That makes it a worthwhile experiment.
So let it RIP

Cheers, Finn Hammer

Terry Fritz

Tue Nov 28 2006, 05:20AM

Registered Member #393 Joined: Tue Apr 18 2006, 12:30AM
Location:
Posts: 297

Hi Finn,

Cool!! A LOT more damage than I was able to do with "just" 800J

I rebuilt mine (easy), but lost interest in that design for bigger and better things. So I shipped the old one off to Conner. Knowing that, someday, he will do something far greater

He is one with that "God's eye" perspective over all this...

Two years ago I sent about 10 CM600 bricks to Ward... Starting to payoff now in that other post about 14 foot DRSSTCs

Looking forward to seeing what is next!!!!!!!

I have been all lazy here these days and have not done anything

Cheers,

Terry

Steve Conner

Tue Nov 28 2006, 11:06AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Well, I was going to try the triggered DC resonant charging thing. But Finn beat me to it and came up with a better triggering arrangement than I'd have thought of. As for what's next, it looks like we now have mini versions of all the toys the particle accelerator guys like Greg Leyh use, so not sure what to do next

I do think the SiSG is the way to go though: it's more powerful than the OLTC and not as temperamental as the DRSSTC.

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