Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help with Peltier circuit

  1. Jul 28, 2015 #1
    I have a Peltier cooler and with the temperatures that I am using on either side, I am getting ~55mv. These temps cannot be changed however and I need the right step up so I can be getting about 3V's out of it, any links and info will be greatly appreciated!
  2. jcsd
  3. Jul 28, 2015 #2


    User Avatar
    Gold Member

  4. Jul 28, 2015 #3


    User Avatar

    Staff: Mentor

    Note though that if you increase the voltage in that way, the amperage will drop.
  5. Jul 28, 2015 #4
    I assume this is for power generation?

    Use 60 small coolers in series?

    You might use something like the circuit meBigGuy presented with fewer elements, but even that needed 350mV input minimum.

    All the voltage multipliers I know of use semiconductors which can't really switch at 55mV.

    Of course you could treat the 55mV as a signal and amplify it, but that requires outside power.
  6. Jul 28, 2015 #5
    The other challenge to this is that I can't just put multiple peltiers in series because of size and space concerns.
  7. Jul 28, 2015 #6


    User Avatar
    Gold Member

    The linear tech device says : Operates from Inputs of 20mV

    Not sure why I posted the link to the 350mv part. Maybe I grabbed the wrong one. I'll look again.

    Note that for any stepup methodology, the total power (I * V) available remains constant (minus conversion losses)

    Devices in series is nearly always better.
  8. Jul 28, 2015 #7
    Say I had to in series both putting out 55 mV what would the step up for that be (links?)
  9. Jul 28, 2015 #8


    User Avatar
    Gold Member

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook