I want to control peltier element's temperature with a PWM driven bipolar DC motor controller to be able to switch between heating and cooling and also control the level of it. The peltier element is 12V/8.5A. I also have 12.5A DC power adapter.
I want to buy a motor controller (like this 13A controller) in order to simplify the project as much as possible. This particular controller can be driven by 20kHz PWM.
I was thinking about a following circuit:
in1 and in2 would be connected to outputs of a controller. out1 and out2 would be connected to peltier.
Using 1mH inductors and 470uF gives 232Hz rolloff frequency which is 86 times smaller than 20kHz.
I have a few questions:
1) Does this circuit make sense and is it enough for my situation? 2) I found 1mH 10A inductors, but I'm not sure if I should take into account anything else regarding L and C proportions and this particular circuit 3) Do I have to look for anything specific in capacitor or will any 470uF capacitor be fine? Is bipolar capacitor required?