View Full Version : How About This To Power A Peltier / Tec
10-17-02, 11:26 PM
13.5 W 20 A 19.95!
OOPS nevermind. It's AC to AC. CRAP
10-18-02, 12:18 AM
that looks like it would actualy work pretty good.
I've got a better one...
Its about 30-40 pounds, and used to power a 1000watt audio amplifier...
10-18-02, 02:09 AM
The transformar gives out AC current, you need DC, so you could just put a rectifying bridge after ti and it should work fine.
10-18-02, 12:00 PM
The rectifier alone would give you "DC" current with an enormous amount of ripple on it. The manufacturers say that TEC's shouldn't see more than 10% 60Hz ripple. A rectifier alone would give you 100% ripple. You would need enormous filter capacitors, to filter the output of that tranformer down to 10% ripple. These caps are expensive. See this thread. (http://forum.oc-forums.com/vb/showthread.php?threadid=122907)
The second problem is that the output voltage rating on that transformer is 13.5 Vac RMS. The peak voltage of the output sine wave will be at 19 V. A rectified and filtered DC voltage produced with that transformer will be around 18V. If you are powering a 172W 24V TEC with this system, 18V is not a bad operating point. You definitely don't want to use this with a 226 Watt TEC though.
A switching supply is the way to go for this.
10-22-02, 01:56 PM
How about this one for you?
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