Electronics > Beginners

Building a PWM filter for a Peltier

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arronar:
Hey. What if I don't use the inductor because I couldn't find one with 100uH/10A or 94uH/10A in the local store? Is it going to work?

rs20:

--- Quote from: arronar on November 16, 2018, 10:03:51 am ---Hey. What if I don't use the inductor because I couldn't find one with 100uH/10A or 94uH/10A in the local store? Is it going to work?

--- End quote ---

What do you mean "don't use the inductor"? If you just leave it out, the peltier can't be powered. If you replace it with a solid wire link, then it's just unfiltered PWM at which point you should get rid of the capacitor too (because it, and the MOSFET, are going to stress each other out a lot for no good reason.)

arronar:
Yes, you are right. Excuse me for my noobish questions. Its the first time I'm trying to play with these ideas.
 I found a 10uH in my storage. What about using it?
Or else I should buy these

wraper:

--- Quote from: arronar on November 16, 2018, 10:12:18 am ---Yes, you are right. Excuse me for my noobish questions. Its the first time I'm trying to play with these ideas.
 I found a 10uH in my storage. What about using it?

--- End quote ---
Too small inductance unless PWM frequency will be at least a few hundred kHz

arronar:

--- Quote from: wraper on November 16, 2018, 10:33:54 am ---Too small inductance unless PWM frequency will be at least a few hundred kHz

--- End quote ---

Because I'm using the R/C mode (page 11) of the driver I suppose that the PWM frequency is at 50Hz.

Is there any other way to filter it? Another schematic probably.

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