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Forums
4hv.org :: Forums :: General Chatting
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Extreme MOSFET cooling

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Avi
Sun Dec 21 2008, 06:06PM Print
Avi Registered Member #580 Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
 		double stack peltier.
1229882796 580 FT0 Img 2429
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rp181
Sun Dec 21 2008, 06:19PM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
 		semiconductors have a minimum temperature too =p
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Mads Barnkob
Sun Dec 21 2008, 07:11PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		40N60 and 60N60 IXYS IGBTs I just looked up are rated -55 to +150 degrees Celcius.

IRFP 250/560 are rated -65 to +150 degrees Celcius


I once had a nice big peltier element, im sad that I sold it :)
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Chris Cristini
Sun Dec 21 2008, 08:14PM
Chris Cristini Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
 		I just found a whole bunch of them on eBay just type in peltier.
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Avi
Mon Dec 22 2008, 01:21AM
Avi Registered Member #580 Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
 		it is only about -25C. I measured a considerable drop in load voltage when cooled for any given fixed gate voltage.
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Conundrum
Wed May 25 2011, 06:59PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
 		Any idea how cold this stack is getting?

I estimate around -9 or so

-A
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magnet18
Wed May 25 2011, 07:43PM
magnet18 Registered Member #3766 Joined: Sun Mar 20 2011, 05:39AM
Location: 1307912312 3766 FT117575 Indiana State
Posts: 624
 		My minifridge has a freezer section... I've been known to fill an icecube tray with fets before wink
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ConKbot of Doom
Wed May 25 2011, 08:22PM
ConKbot of Doom Registered Member #509 Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
Mads Barnkob wrote ...

40N60 and 60N60 IXYS IGBTs I just looked up are rated -55 to +150 degrees Celcius.

IRFP 250/560 are rated -65 to +150 degrees Celcius


I once had a nice big peltier element, im sad that I sold it :)

And thats die temperature :D Put them in dry ice/acetone or LN2, just make sure you run them hard enough to keep the die above the min temp shades
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Inducktion
Thu May 26 2011, 03:11AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		Speaking of Peltier devices, why are they so inefficient?

And, what's the purpose of this? Just to move heat more quickly? I know they're used in minifridges (i think my sisters dorm one has one)

But what do they offer in terms of cooling? One side gets really hot, and one gets really cold...
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Pinky's Brain
Thu May 26 2011, 03:58AM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
 		They are inefficient because electrically conductive mediums tend to be thermally conductive mediums.

In theory you could build something roughly equivalent to a cold cathode vacuum tube triode to work as a thermionic cooler as well ... since the vacuum is a good thermal insulator this would be ideal.

PS. at least I think it's possible, for some reason all the existing vacuum thermionic coolers only use a voltage between the anode and the cathode ... but no grid. To me it seems a grid with a positive grid voltage significantly higher than the anode voltage would make it easier to lower the work function, without having to make the cathode/anode gap really small and without unnecessarily accelerating the electrons (which pumps extra energy into the anode). I'm probably missing something though, cause no one has done this AFAICS (and in my experience any good idea I have is generally an unoriginal one).
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