how to drive peltier cooler pad at home?

I purchased an peltier cooler plate (90W maximum, but it could work at different power) like the model shown in this link http://pcbheaven.com/wikipages/The_Peltier_Thermo-Element/ . It has a wide working range on voltage and current. I use a AC-DC power supplier (12V, 0.5A), which was used to drive MP3 player, to drive the peltier. I also connected a fan (12V, 0.9W) in parallel to the peliter to the supplier. When I plug it to the home socket, it works for 10minutes, one side of the peliter is very cold and other side is so hot, and the fan is working (but spinning so slow). After 10 minutes, the power supplier becomes so hot. I thought the power of the fan is constant and the supplier provide 12V, so why the power supplier is getting that hot, it seems like it is drawing more and more current out of the wall.

• You are saying your peltier can draw 90w, which at 12v is 90/12 = 7.5 Amps. Your power supply is ~15x under powered and will be working itself to death trying to supply as much power as it possibly can. Commented Aug 7, 2013 at 9:31
• So it means even the power supplier states that the output is 12V and 0.5A, it does not really maintain the constant current? So is there any power supplier can fix the voltage and current output so the peltier can only consume certain power? Commented Aug 7, 2013 at 9:40
• You need a larger power supply, capable of supplying at least 8A. Commented Aug 7, 2013 at 9:43
• @user1285419 - It seems to me you need to work on your understanding of the basics of electricity, Ohm's law, etc. - The only reason your power supply has not exploded already is that it has some current limiting / protection built in. Commented Aug 7, 2013 at 12:14