Hi Waqar,
You can write a simple MATLAB function to calculate the pulse width of PWM signal and then use it in Simulink using a MATLAB function block.
You can use the Clock block to give current time as input to your function. Second input will be your PWM signal (you can use a Pulse Generator block for test).
The function should,
- Take the current value of signal and current time as input
- Detect rising/falling edge occurred and maintain the time when last rising edge and last falling edge appeared
- Difference between the time of last rising edge and last falling edge will give you the on time
- Difference between the time of newest rising edge and previous riding edge will give the period
- (on time/period) * 100 will give the percentage of on time in the PWM cycle
Note: Make sure to use persistent variables for storing values like the time when rising/falling edge occurs or time when previous rising edge occurred in the MATLAB function.
I hope this solves the issue!
