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'High-V Power Switches'
1998\05\10@220926 by Andy Kunz

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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?

Thanks.

Andy

==================================================================
                    Andy Kunz - Montana Design
         Go fast, turn right, and keep the wet side down!
==================================================================

1998\05\10@223312 by Dennis Plunkett

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At 09:31 PM 10/05/98 -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?
>
>Thanks.
>
>Andy
>
>==================================================================
>                     Andy Kunz - Montana Design
>          Go fast, turn right, and keep the wet side down!
>==================================================================
>
>

Semikron is the company for these little darlings. Seimens do have high
power FETS (As do others) that may also handle what you need.


Dennis

1998\05\10@224143 by peter

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Andy Kunz 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?

Check out IXYS (http://www.ixys.com)or SEMICRON I have use some of their stuff,
mostly SCR modules
I don't know their full range but it's their corner of the market

--
Peter Cousens
email: spam_OUTpeterTakeThisOuTspamcousens.her.forthnet.gr  phone: + 3081 324450, 380534
snailmail:  Folia, Agia Fotini, Karteros, Heraklion  Crete, Greece.

1998\05\10@230422 by Chris Eddy

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Well, I assume that your run of the mill power semiconductor device can be
coaxed into this sort of surge performance.  But you have to wonder if you are
going down the right path when you have to wear goggles and a vest when you
are working on your prototype (or a badge of stupidity).  It is just a
thought, but why not try one of the big tubes?  Granted, not your mainstream
device, and it all depends on whether this device is for a particle
accelerator or the next transistor radio.  You might start with Richardson
Electronics (sic?) in new england.

FWIW
Chris Eddy, PE
Pioneer Microsystems, Inc.

Andy Kunz wrote:

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1998\05\11@001929 by Peter Wintulich
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International rectifier HEXPAK Power Mosfet IRFK6H250  is 200V 560A peek (140A continuious)  

two of thoes might do?

>>> Andy Kunz <.....montanaKILLspamspam@spam@FAST.NET> 05/11/98 11:01AM >>>
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?

Thanks.

Andy

==================================================================
                    Andy Kunz - Montana Design
         Go fast, turn right, and keep the wet side down!
==================================================================

1998\05\11@143933 by Morgan Olsson

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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 \
\  mrtspamKILLspaminame.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /

1998\05\12@201049 by Kalle Pihlajasaari

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Hi Andy,

What be you making now.  Trying your hand out with some electro forming
of metals.

> 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).

There might be some mechanical device that could do what you want
with a switch that has a rotating member that shorts two busbars
for a portion of a revolution and sticks in the off position and tensions
a spring until it is forsed to turn past the 'on' position at a
suitable speed to achieve the required on time.

> Anybody have pointers on what devices I should be looking at?

Semiconductors seem to be available in a few types from what I see on the
list.

Cheers
--
Kalle Pihlajasaari   .....kalleKILLspamspam.....ip.co.za   http://www.ip.co.za/ip
Interface Products   P O Box 15775, DOORNFONTEIN, 2028, South Africa
+ 27 (11) 402-7750   Fax: 402-7751    http://www.ip.co.za/people/kalle

DonTronics, Silicon Studio and Wirz Electronics uP Product Dealer

1998\05\13@114237 by DREITEK

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In a message dated 98-05-12 20:11:05 EDT, you write:

<<
Hi Andy,

What be you making now.  Trying your hand out with some electro forming
of metals.

> 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).

There might be some mechanical device that could do what you want
with a switch that has a rotating member that shorts two busbars
for a portion of a revolution and sticks in the off position and tensions
a spring until it is forsed to turn past the 'on' position at a
suitable speed to achieve the required on time.

> Anybody have pointers on what devices I should be looking at?

Semiconductors seem to be available in a few types from what I see on the
list.

Cheers >>

Hi All,
About 15 years ago I worked on a machine that used a high voltage high current
pulse from a large capacitor bank to blow holes in ceramic material with a
shock wave of water.  This was done using a vacuum tube switch.  I don't
remember  the details of the tube (MFG and part number).  It had a control
grid that operated off fairly low voltage.  We could get the tube to condict
massive currents with virtually no on time.

Just a thought.  There are still some very good uses for vacuum tubes.

Dave Duley

1998\05\16@070610 by paulb

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DREITEK wrote:

> About 15 years ago I worked on a machine that used a high voltage high
> current pulse from a large capacitor bank to blow holes in ceramic
> material with a shock wave of water.  This was done using a vacuum
> tube switch.

> Just a thought.  There are still some very good uses for vacuum tubes.

 Vacuum tube?  It wasn«t by chance mercury vapour was it?

 Cheers,
       Paul B.

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