PWM frequency and LC filter

Discussion in 'General Electronics Chat' started by ricperes, Feb 3, 2016.

  1. ricperes

    Thread Starter New Member

    Feb 3, 2016
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    I'm new here, I have some fairly basic doubt. I am creating a PWM signal in MatLab by comparing a sine wave (50Hz) and a triangular wave (2kHz) .... So what is the PWM frequency will output?

    After getting the PWM signal filters I want to get a sinusoid, using an LC filter, but do not know what the frequency of cut should I use?

    Thanks for help
     
  2. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,546
    1,252
    You are modulating a 2 kHz carrier with a 50 Hz signal, so the output fundamental frequency will be 2 kHz. To demodulate it, start with a 50 Hz filter and see what the results are.

    ak
     
  3. ricperes

    Thread Starter New Member

    Feb 3, 2016
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    I had tried with this equation Fc=1/2*PI*sqrt(LC) , but with fc=50hz i didn't have good results
     
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