Circuit-design Peltier Element

[uicElla]

Hi. I need a little help from experienced people.

I want to control a Peltier element with a microcontroller, with PWM. May? The peltier element has the following parameters: Imax=8.5 A, Vmax=15.4V.Ok... I have a 12 volt source,17A for example.

How can i design the circuit so that i can control the peltier element?

A link to the peltier element data sheet is:

https://eu.mouser.com/datasheet/2/433/Wakefield_Vette_Thermoelectric_Cooler_Full_Data_Sh-1501217.pdf

 

[gophert]

The element has a resistance of about 3 ohms. If you connect 12VDC to it, the element will only allow 4 Amps to flow. You can connect your micro pin to the Gate pin of an N-channel Mosfet. Connect the source pin of Mosfet to ground and then put the element between the Drain pin of Mosfet and your 12VDC supply.

 

[uicElla]

I forgot to mention, my peltier is TEC-40-33-127

 

[gophert]

I forgot to mention, my peltier is TEC-40-33-127

Then correction...

Resistance is about 1.55 ohms and increases as it gets warmer. Max current is 8.5amps

At 12VDC, your device will allow 8 amps to flow. If you are using PWM, I would limit to 90% duty cycle to make sure it doesn't stay so close to max 8.5amps. Again, you don't need current limiting from your 12VDC supply but I don't know if they are intended to use 100% duty cycle for long periods of time at max (near max) current.

 

[uicElla]

What type of Mosfet can i use? I don't know how to choose the Mosfet