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Make your own (more reliable) Peltier/TEC PSU - Page 5

post #41 of 63
After deliberating for too long I have deicided to do a full rewire of the 3 power supplies for the 15 Volts required on the large peltier module it is finished. I have been a little worried about the heat generated from the wiring as 30 Amps is a little hefty and can-not be dealt with lightly. So I have added some heavy duty cabling amongst other things and with some luck this PSU will be going strong for a long time.

Here is some little low res pics...
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post #42 of 63
Thread Starter 
Do you have to have all 3 of them plugged in? On mine, I ran a jumper wire from the 110v input of 1 PSU to the other two. That way I only have to turn 1 on, which is the only PSU I have with a mechanical on/on (as opposed to shorting the green wire to ground).
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post #43 of 63
No mate I plug them all in, as 2 of them have the on\\off switch and the other doesn't. I could transfer it to the single switch but I figure I can play with 5\\10\\15 v a little easier. I have it running now and there is no heat at all coming from the wiring any more. The heat source I have found though is not the red lead at the peltier soldered end. A little sus I think, time to check it out and maybe do a repair.

I am considering running 20 V by adding a 4th PSU.

....Now were is that gas soldering iron........?
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post #44 of 63
Nice job mate..
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post #45 of 63
It should be possible to get 15 volts out of a single power supply. Im not too sure on exactly how to do it, but you can make a simple circuit out of some resistors and capacitors that will give you the desireed D/C output to the peltier. This is as long as you have a powerfull enough PSU.
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post #46 of 63
That's exactly it. It's not just the voltage he needs. He needs a good amount of amperage as well. That's why you use 2-3 PSUs. Their combined power will give you the amps you need to power a pelt.
post #47 of 63
i dont know which kinds of Peltiers you are expecting to run, but the draw on most is between 60 and 200 watts. the CPU and Video card only need about 300 to run, so if you have a 500watt PSU it should work out well.
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post #48 of 63
Thread Starter 
Quote:
Originally Posted by dizzy4
i dont know which kinds of Peltiers you are expecting to run, but the draw on most is between 60 and 200 watts. the CPU and Video card only need about 300 to run, so if you have a 500watt PSU it should work out well.
Not necessarily. If you look at these 500 watt PSU's, they have their amperages separated between the 3.3, 5 and 12v rails. For instance, the old PSU I'm using right now is labeled 300 watts. However, the 12v rail can only source 18 amps before the PSU shuts down. 12x18=216 watts. BTW with the homebrew PSU, I'm running a 437w peltier that at 24v draws around 25a. That's 600 watts, a far cry from the 200 watts you're talking about.
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post #49 of 63
Quote:
Originally Posted by Pinhead-227
Not necessarily. If you look at these 500 watt PSU's, they have their amperages separated between the 3.3, 5 and 12v rails. For instance, the old PSU I'm using right now is labeled 300 watts. However, the 12v rail can only source 18 amps before the PSU shuts down. 12x18=216 watts. BTW with the homebrew PSU, I'm running a 437w peltier that at 24v draws around 25a. That's 600 watts, a far cry from the 200 watts you're talking about.
Hmm.... yeah... for now I ordered TECs with less input. I ordered another PSU for later applications. I started a thread for my buildlog, but until i get the components i cannot design my case fully.

Know where i can get those higher power TECs?
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post #50 of 63
You can get your parts from here dizzy4.



On other things I am currently (when time permits) going to add another PSU to the homebrew supply so 20V is the name of the game. I also need to do some repair work as I yanked the red wire out of the 437 watter module by accident. Doesn't look too hard just a little tricky.
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