BIG solid state devices...

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Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi,

I note the Hitachi MBN1200D33C

http://www.hitachi.co.jp/Div/ise/pdevice/igbt/index-e.htm

http://www.hitachi.co.jp/Div/ise/pdevice/igbt/d-igbt/1200d33c.pdf

switches 3300 volts at 1500 amps with 6 volts of CE drop...  If one were to
put 8 in series to run a 21kV firing voltage, you would get about 48 volts
drop or 48 x 21000 = 1008000 watts (i) of instantaneous power loss.  But
the system power is 1500 x 21000 = 31500000 watts (i)

So the switching would near 97% efficiency!!!!!  A far cry from our ~50%
spark gaps.  The reverse diode is almost twice as good!!!  It boggles the
mind to think what silent (or very quiet), cold running, solid state
primary gaps could do!!!!

The technology really is here now but the cost are still too high.  But
they are getting cheaper every day. :-))  I am note sure how much the
MBN1200D33C sells for but I bet they are a few hundred at least...  But
there is lots of competition :-)))  I am surprised so much has changed in
the last year!

A nice high power/voltage (like 5MVA :-)) IGBT application note is at:

http://www.hitachi.co.jp/Div/ise/pdevice/apl/igbt-aple.pdf

Cheers,

	Terry