Re: Cooling MOFSETS and IGBT's.

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

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

Hi,

Water cooling can pull about 10X the heat out of something compared to
regular convective or forced air cooling.  Since each high voltage section
would be a step up of about 1000 volts, current leakage may be a problem.
The current is DC in this type of SSgap coil (during charging) and then
there is the AC (~150kHz) during firing.  So basically the two ends of the
cooling tubing would be about 20kV from each other.  Oil may be the best
medium for such a system since it is an insulator but can carry off heat
too.  It could be reasonably contained in a little recirc system.

However....  I would hope a SSgap would not require anything but modest air
heat sinks.  If I go pumping hundreds of watts into heating the water, that
energy is coming directly out of the streamers energy...  I think the trick
is to keep the power dissipated in a solid state gap as low as possible so
the streamer gets all the power.

Cheers,

	Terry 


At 09:54 AM 3/19/2001 -0800, you wrote:
>
>
>Tesla list wrote:
>> 
>> Original poster: "sundog by way of Terry Fritz <twftesla-at-uswest-dot-net>" 
><sundog-at-timeship-dot-net>
>> 
>> 
>>  On a thought, I do *NOT* recommend trying to watercool electrodes.  It'd
>> take a pump insulated to 30kv or so.  The $20 home-depot-special will most
>> assuredly arc over and fry (and put HV on the mains).  So don't try it.
>> 
>> Thanks Marc for thinkin' of using this on IGBS's!
>> 
>>    Comments, questions and snide remarks welcome!
>>                                                                            
>             Shad
>
>Distilled water as the coolant would work quite nicely, and hold off the
30 kV.
>
>or, run entire water cooling rig "floated" at the HV.
>