- Joined May 30, 2022
"Using PWM without smoothing causes increased I2R losses in the Peltier element that reduces the available cooling and efficiency."I want to control a peltier (tec1-12706) using arduino uno pwm pins. The voltage across its terminals is 12v when pwm is 255 and it is 0 when pwm is 0. What circuit can be used to do so?
Not sure since it doesn't show a schematic, and I don't work from a picture of a breadboard.Does the circuit shown is going to work?
Can't tell without a schematic, and I'm not clairvoyant, so please post one of what you did.I have tested the circuit practically, I got a maximum voltage of 8v instead of 12v as I want. What could be the issue?
No, you can't use resistors and capacitors in place of an inductor for that purpose here.I do not have any kind of inductors, but I can make a RC filter instead, I am just worried about impedance I don't want to use many resistors and capacitors
Yes, but that will give high dissipation in the MOSFET as I noted.Does averaging the PWM signal = passing it through a low pass filter?
Diodes are not Zener, but Schottky. Two diodes in one package. Low V forward, low dissipation. They provide continuous current through Peltier between PWM pulses.Could you please explain in brief the role of each component, i.e. why did you use zener dioded? Why this MOSFET specifically, can I replace it with IRF540N, because I don't have this one? What happens when using the PWM frequency of arduino which is much less than the used frequency here.
As I stated, that MOSFET needs a 10V gate voltage to fully turn on.I just need to mention that this design is not my own one, I have just used the design I mentioned before. This desgin uses pwm of arduino directly, which has an amplitude of 5v.
Did you saw this link in my post #13, about Arduino"s PWM frequency changes?For your design, as you said using a coil of bigger inductance will have a higher resistance, and dissipates more energy. This was expected, but I am mentioning at the beginning that I want to control it with arduino, and it cannot output a frequency of 31k!
For the transistor, unfortunately I don't have the AON65650 one so I have replace it with IRF540 while the energy dissipation will be greater, but think about compensating this energy dissipation.
Or see here: https://www.electronicwings.com/use...frequency-changing-of-pwm-pins-of-arduino-unoPWM frequency is 31372.55 Hz.
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by Robert Keim