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PWM frequency and LC filter

Discussion in 'General Electronics Discussion' started by Ricperes, Feb 2, 2016.

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  1. Ricperes

    Ricperes

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    Jul 20, 2015
    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. Alec_t

    Alec_t

    2,970
    805
    Jul 7, 2015
    Does this help? The yellow plot shows the PWM output as 2kHz. I'm surprised MatLab can't tell you?
    SineTriangle.PNG
     
  3. Ricperes

    Ricperes

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    Jul 20, 2015
    I had been create a PWM signal in MatLab by comparing a sine wave (50Hz) and a triangular wave (2kHz) , my doubt is what de frequency of PWM in output? Is 2khz as the triangular wave ?
     
  4. Alec_t

    Alec_t

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    805
    Jul 7, 2015
    For your purpose the output PWM frequency = the triangular wave frequency = 2kHz.
     
    Ricperes likes this.
  5. Ricperes

    Ricperes

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    Jul 20, 2015
    So now i want to filter that pwm signal to get a sinusoidal wave. I use a LC filter, so you can explain me how i can dimension this filter?
     
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