At 21:31 1998-05-10 -0400, you wrote:
>I need a solid-state switch of some sort capable of handling 200VDC input,
>switching (in a massively-parallel method if necessary) 1000+ amps, but
>only for a very brief duty cycle (a few hundred uS in 10S).
>
>Anybody have pointers on what devices I should be looking at?

A year ago I built a 12V 1kA 0-100% PWM regulator.
I used a bunch of International Rectifiers TO220 MOSFETS in parallel.
(Best price/performance)  Think they called them "Fifth generation".  Each
TO220 handles 50A continous without problem.  Mounted them directly on
copper plate, then isolation between plate and the alumina chassis.
Current sensing resistors (for overcurrent shutoff) made of brass, one for
each MOSFET for heat distribution.  Take good care of decoupling etc, and
impedance and coupling issues both for power and gate!!  Otherwise there
may be severe problems, like HF oscillation that might destroy the parts or
at least make lot of EMC problems!

As you may not have the same very high demands of very low Rdson maybe You
can look at the power modles made by IR, Semikron, Siemens etc.  (Probably
a lot easier, but slightly more expensive than a bunch of TO220)

For your short, widely spaced pulses you will not need much cooling,
instead look at the thermal impedance of the devices and see how high in
current You can go for the short on-times.

Good luck

/Morgan

>Thanks.
>
>Andy
>
>==================================================================
>                     Andy Kunz - Montana Design
>          Go fast, turn right, and keep the wet side down!
>==================================================================
>
>
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  mrt@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /