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I was wondering if it's possible to reverse the current so that the cool side of peltier plate becomes hot? I'm attaching a peltier plate to one side of a container, and the purpose is to have the option of cooling or heating. I've read something about using an H-bridge, but I am not sure how this will work. Sorry I'm new to electronics.

I found this video https://www.youtube.com/watch?v=Da5t030XmcM Would it be possible to add a switch so that it's either hot or cold?

Edit: https://i.sstatic.net/M51iz.jpg Would a circuit like this work instead of Load, I replace it with a peltier plate

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  • \$\begingroup\$ I did google H-bridge, but I just don't understand the circuitry with a peltier plate \$\endgroup\$
    – user170035
    Commented Nov 28, 2017 at 1:32
  • \$\begingroup\$ H bridge is just a DPDT switch to reverse polarity. Good Conduction heat transfer and/or forced air with heatsink is essential in either case. \$\endgroup\$ Commented Nov 28, 2017 at 1:37
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    \$\begingroup\$ yes, it's possible. \$\endgroup\$
    – dandavis
    Commented Nov 28, 2017 at 2:04
  • \$\begingroup\$ Yes you can do this, however if you want to control the temperature keep in mind that the Peltier is a lot better at heating than at cooling so the optimum control tuning will be different for heating and cooling. \$\endgroup\$ Commented Nov 28, 2017 at 6:16
  • \$\begingroup\$ Would using this robotshop.com/en/… work? How does the schematic look like with that and a peltier plate with Arduino? \$\endgroup\$
    – user170035
    Commented Nov 28, 2017 at 10:56

2 Answers 2

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schematic

simulate this circuit – Schematic created using CircuitLab

The DPDT switch will reverse polarity.

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  • \$\begingroup\$ Would it work with controlling the current too of the peltier? For instance in this sketch imgur.com/a/uP46L I'm planning to replace the lamp with the peltier plate. The overall goal is to reverse current and also be able to control the current would this work? Source of image: itp.nyu.edu/physcomp/labs/motors-and-transistors/… \$\endgroup\$
    – user170035
    Commented Nov 28, 2017 at 5:17
  • \$\begingroup\$ imgur.com/a/Cpirb Would a circuit like this work instead of Load, I replace it with a peltier plate \$\endgroup\$
    – user170035
    Commented Nov 28, 2017 at 7:39
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    \$\begingroup\$ A "Load" is anything that sinks power, or is controlled. What do you think? \$\endgroup\$
    – R Drast
    Commented Nov 28, 2017 at 11:03
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The circuit below is the basic H-Bridge in both states.

Notice with the top circuit the current flows from the left to the right through the load.

schematic

simulate this circuit – Schematic created using CircuitLab

Meanwhile in the bottom circuit with the switches switched the other way, the current flows in the opposite direction.

There are numerous circuits and devices that can accomplish this which you can research on-line.

If you want is simple, you could use a switch if you are going to control it manually, or you can use a simple relay as shown below.

schematic

simulate this circuit

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  • \$\begingroup\$ Thank you for this! I can't seem to think of a way to incorporate a dpdt switch to this circuit imgur.com/a/OIOA2 which is to control the current going in to the peltier plate, and I'm implementing the switch to reverse the current. Source: web.archive.org/web/20170511052411/http://garagelab.com/… I wa \$\endgroup\$
    – user170035
    Commented Nov 28, 2017 at 6:11
  • \$\begingroup\$ I'm not going to attempt to read a crappy Fritzing diagram, but assuming it was a low side switch, fit it between Batt - and the lower wire joining switches 1 and 2. \$\endgroup\$
    – user16324
    Commented Nov 28, 2017 at 11:14
  • \$\begingroup\$ @JakeGinobi the simplest solution for you is to use a DPDT relay. \$\endgroup\$
    – Trevor_G
    Commented Nov 28, 2017 at 11:53

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