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Re: [TCML] SISG - now with a "real" pig coil



Phil,

With a primary Z of 15.8 ohms and a firing voltage of 21.6kV you are looking at primary currents in the range of 1300Amps.

If you are using the "standard" IGBT`s, I`d say that is too high a current.

If a IGBT fails, the sidacs are sure to follow in short order.

A Pearson is your best friend.

Cheers, Finn Hammer

snip

FWIW, I'm still running the same .220 uF total primary tank. Calculated ~55 uH of primary, 50kHz Fres calc and measured. Pig ballasted to 60A max, variac'ed for 280V out. I didn't crank the variacs past where the gap fired rhythmically, since I'm running STR and I didn't want the BPS to run away (easy with a SISG). Six SISG-4 boards for 21.6kV firing point.


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