Electronics > Beginners
Building a PWM filter for a Peltier
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arronar:
Currently, I managed to drive a Peltier element using the Syren 10A Driver using PWM from a raspberry pi. But because I want to set up a PID control later for its temperature, and the Syren 10A driver uses PWM to drive the Peltier, I read online that it could be good first to make a filter for the PWM.

The Peltier element that I use is either the ET-190-1010-1212-RS or the TES1-12704. By searching on the internet I found this picture describing a PWM filter:



The difference here is that in this schematic they use a MOSFET to drive the Peltier and the resistance of the Peltier itself.

So I was wondering if I can use this filter for my Peltiers or I should change some of the resistor/capacitor values and how one can calculate these.

Any help or idea will be appreciated.
RoGeorge:

--- Quote from: arronar on November 15, 2018, 09:42:42 pm ---...I read online that it could be good first to make a filter for the PWM...
--- End quote ---
Do you have a link about that, please?

I see no reason why the unfiltered PWM wouldn't work.  The thermal inertia of the Peltier element will act as a filter anyway.
arronar:
Here is a post from this same forum.
Zero999:
Is it really necessary to filter the PWM? As long as it's above the thermal time constant of the Peltier element then I don't see why it would need to be filtered.
arronar:

--- Quote from: Hero999 on November 15, 2018, 10:01:33 pm ---Is it really necessary to filter the PWM? As long as it's above the thermal time constant of the Peltier element then I don't see why it would need to be filtered.

--- End quote ---

If you are asking me, I don't know...
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