I am doing a project using a peltier TEC1-12706, however I am stuck on powering up the device. I am using a computer adapter power supply(20V;90W) and I it coupled with a synchronous buck-boost module to bring it down to 12V. During the initial seconds the power supply did handle powering up the module but later smoke came out with my buck-boost converter.

  1. What are your recommendations for the powersupply? BTW, the peltier supply was also coupled with computer cooler which consumes around 500mA and a raspi fan on the other side.
  2. Follow-up question, is the peltier usually reads as short using DMM buzz test? Ohmmeter around 1ohm only. Sorry, this is my first time working with the component.
  • \$\begingroup\$ Please provide a datasheet for the peltier and your supply module; it's a 6A device so not exactly a small load at 72W. You need to consider conversion losses and oftten the supply `watts' are… well, fake. Also, it's normal that it measures as a short since it's essentially two welded wires \$\endgroup\$ – Lorenzo Marcantonio Apr 14 at 7:01
  • \$\begingroup\$ @LorenzoMarcantonio Thanks for the answer. I thought I messed up the module that is why it always buzzing. I currently don't have a datasheet or manufacturer p/n of the peltier which I bought online. I was hoping most mfg have almost same specs for same TEC1-12706. I have tried my to drive my project with a var powersupply but it switches to CC. I am hoping this is only a low supply issue. \$\endgroup\$ – Judevic Pagunsan Apr 14 at 7:17
  • \$\begingroup\$ 1 Ohm sound a bit too low for my taste. Do you have a proper heatsink on the hot end? TECs die pretty fast when they are operated without heatsink. \$\endgroup\$ – Sim Son Apr 14 at 14:35
  • \$\begingroup\$ Why do you need 12Vdc which will draw about ~5A link, can you explain your application better? I'd recommend going with lower voltage if possible like 5Vdc and using dedicated external power supply \$\endgroup\$ – Ernesto Apr 14 at 22:56

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