MATLAB: Can someone explain me on how this duty cycle work

duty cycleSimscapesimulink

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Hi,

A duty cycle or power cycle is the fraction of a signal or system is HIGH. Duty cycle is commonly expressed as a percentage or a ratio. A period is the time it takes for a signal to complete an on-and-off cycle.

Hence, for the PWM Generator block we have to input duty cycle in terms of percentage.In order to do that for your model, first try to make the output (Vout / (Vout + Vin)) of your duty cycle subsystem to be in between 0 and 1.Then insert gain block with value 100 before PWM Generator block to convert to a percentage

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MATLAB: Duty cycle Matlab funciton is Simulink. Error! -Undefined function or variable ‘duty_cycle’. The first assignment to a local variable determines its class.

Two comments.

Feed the "duty_cycle" to a "unit delay" block and then connect it to "past_duty".
The first line inside your MATLAB Function should be "duty_cycle=past_duty;"

This way, you'll be able to regulate the voltage.

MATLAB: How to create a single square wave of variable duty cycle and length.

From my assumption, you are trying to generate a square wave which looks like in the below image, when length_of_wave is 100, num_cycle is 10 and dutycycle is 0.75

In this case your code throws an error because the value of duty_cycle * length_of_wave/num_cycle is not an integer and you are trying to pass this non-integer value to "zeros" function. Hence the error.

You can make use of the following piece of code

function waveform = squareWave(length_of_wave, num_cycle, duty_cycle)
oneCycleLength =  length_of_wave/num_cycle;
t=1:oneCycleLength;
oneCycle(t)=0;
oneCycle(oneCycleLength*duty_cycle+1:end) =  1;
waveform = repmat(oneCycle, [1,num_cycle]);
plot(waveform)
end

In the above code, you have to handle the case when length_of_wave = num_cycle

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Related Solutions

MATLAB: Duty cycle Matlab funciton is Simulink. Error! -Undefined function or variable ‘duty_cycle’. The first assignment to a local variable determines its class.

MATLAB: How to create a single square wave of variable duty cycle and length.

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