Re: BIG solid state devices...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "colin.heath4 by way of Terry Fritz <twftesla-at-qwest-dot-net>" <colin.heath4-at-ntlworld-dot-com>

ye sdan it has
                    but isnt it the extremely high current peaks that
present a problem not somuch the voltage as you probarbly know the peaks on
a tesla coil can be very high
cheers
colin

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, July 13, 2002 5:24 AM
Subject: Re: BIG solid state devices...


> Original poster: "Daniel McCauley by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>
>
> Actually the technology has really been here for at least two decades now
> and has been used quite extensively in the industry for the same
application
> type application.
>
> I've designed and worked with many radar transmitters using these solid
> state switches to modulate TWT cathodes, etc... at voltages up to 500kV !
!
>
> Dan
>
>
>
>
>
> > 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
> >
> >
> >
> >
> >
> >
>
>
>
>