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PWM frequency and LC filter

Ricperes

Jul 20, 2015
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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
 

Alec_t

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

Ricperes

Jul 20, 2015
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Does this help? The yellow plot shows the PWM output as 2kHz. I'm surprised MatLab can't tell you?
View attachment 24793

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 ?
 

Alec_t

Jul 7, 2015
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For your purpose the output PWM frequency = the triangular wave frequency = 2kHz.
 

Ricperes

Jul 20, 2015
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For your purpose the output PWM frequency = the triangular wave frequency = 2kHz.

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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