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Analysing PWM duty cycle of a signal

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Sherzaad Dinah
Sherzaad Dinah on 20 Mar 2023
Edited: Sherzaad Dinah on 24 Mar 2023
I have recorded a PWM signal from a given device.
I require to determine the duty cycle(s) of the signal as the transitions from one state to another.
How may I output the duty cycle of the PWM thoughout the signal?
I am using Matlab 2016b

Answers (1)

David Hill
David Hill on 20 Mar 2023
s=pwm>threshold;%pwm is your signal, threshold is when it is considered on or off
d=diff(s);
idx1=find(s,1);
idx2=find(d==-1);
idx3=find(d==1);
num=idx2-[idx1-1,idx3(1:end-1)];
denom=diff([idx1-1,idx3]);
dutyCycle=num./denom;
  3 Comments
David Hill
David Hill on 21 Mar 2023
Edited: David Hill on 21 Mar 2023
I assumed your data was a horizontal array. For a better response, attach your data.
s=CH01_01(:)';%convert to horizontal array
s=s>.75;
Sherzaad Dinah
Sherzaad Dinah on 22 Mar 2023
Edited: Sherzaad Dinah on 24 Mar 2023
Thank you for your help,
After making the change, I no longer have any error.
However all the calculated duty cycles are greater than 1?!
Is there something else that needs to be done with the data please?
I have attached the data as requested. Kindly please advise.
s = CH01_01(:)';
s=s>0.75;%pwm is your signal, threshold is when it is considered on or off
d=diff(s);
idx1=find(s,1);
idx2=find(d==-1);
idx3=find(d==1);
num=idx2-[idx1-1,idx3(1:end-1)];
denom=diff([idx1-1,idx3]);
dutyCycle=num./denom

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