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Re: 4 stage SISG. Dinosaurs..



Original poster: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

Might be best to "parallel" lesser (cheaper) bricks and distribute the current via split primary capacitance like that "old" OLTC did...

Those bricks like to have water flushed over their back sides... I have "personally" seen them blow heavy panel doors open when they "let go"... I don't do that "now" ;p))) They knocked me on my butt ;-))

But if you need current like that, best to "distribute" that current load... Those big bricks tend to add silicon at the expense of Fo... Why pay $2000 for one when you can pay $200 for ten with the same current rating...

Cheers,

        Terry


At 06:51 PM 2/21/2007, you wrote:
Original poster: "resonance" <resonance@xxxxxxxxxxxx>



Yes, around $2,000 each.  Have not yet ordered them.

Dr. Resonance



Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Oh my, those IGBT's must have been expensive!

Bart

Tesla list wrote:

Original poster: "resonance" <resonance@xxxxxxxxxxxx>



Largest IGBT so far is the PowerEx 1700 VDC, 2400 Amp units.

I used 24 of them in the design for my new 180 kVA "Big Bruiser", 6 on each corner of the H bridge, 12,000 Amps peak pri current. Design is for 75-80 ft long sparks. 7 ft dia. sec x 62 feet high overall. 58 ft long sec coil. 20 ft dia toroid with 8 ft dia toroid beneath this one. We may even go to 200 kVA on this design.

Dr. Resonance


For Really BIG coils. IGBT would get way expensive. Anyone know what the
highest wattage one is so far? Trex is extinct, but he could have eaten a
komodo dragon in one bite:-^) I'm still anxious to try a Terry Piranha II
solid state coil!

Jim Mora