Re: Cooling MOFSETS and IGBT's.

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

Original poster: "Richard Wayne Wall by way of Terry Fritz <twftesla-at-uswest-dot-net>" <rwall-at-ix-dot-netcom-dot-com>

Terry, 
 
Excellent point.  No energy is dissipated by the IGBT while in the off state
and very little while in the full on state since it has a very low Ron.  Heat
is dissipated primarily during switching from off-on and on-off.  Resistive
losses occur primarily during these transitions.  So very high dI/dT and fast
turn on/off states are very desirable.
 
RWW
 
>
> 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 
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