Find the voltage from a PWM signal
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I want to use Simulink to calculate the Average voltage from a PWM Signal. Although I'm not entirely sure how should do it so it works robustly.
The eventual use is to have it working in real time using xpc target but I wondered if anyone could explain even a way to calculate it in a continuous way even.
To anyone that does not know a PWM signal is a Pulse signal that width can be modulated , hence the name.
The voltage of a PWM is the Peak voltage * duty cycle
The duty cycle is the percentage of that the signal is "ON" in any one period
so if the period (of the signal) is 5 seconds and the signal is "ON" for 2 seconds the duty cycle is 40 %
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/154874/image.gif)
So if we look at the picture above we see 5 examples.
Lets say my on voltage is 20 Volts and my off voltage is 0 Volts
So with a duty cycle of 100 %
Average volt = 20 * 1 = 20 Volts
80 % = 16 Volts
50% = 10 Volts
20 % = 4 Volts
0 % = 0 Volts
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So Basically what I want is a way to calculate the:
Peak Voltage of the signal being sent (reseting after every new period)
Duty Cycle of the Signal
and possibly the frequency of the signal
Thanks any advice welcome
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Suneesh
2014-1-9
编辑:Suneesh
2014-1-9
The following example shows how to calculate duty cycle (requires Signal Processing toolbox):
You can use:
[D,INITCROSS,FINALCROSS,NEXTCROSS]= dutycycle(x)
to find out period(frequency), and then use this information for Peak Voltage.
You may use this function in a MATLAB Function block so that you can use it in a Simulink model. Also, a comon method of determining period od a function is by calculating its auto-correlation for which a Simulink block is available in the DSP System toolbox.
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paranandi lakshmi narayana
2016-9-25
hello sir i am doing project on wind energy conversion system using pmsg. i used diode bridge rectifier with boost converter. but when i am applying gate pulses to the boost converter the output of the pmsg got totally changed.i don't know whats happening there but intially without applying gate pulses i got right answer but now its completely changed. please suggest what to do
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