| 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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