why is output of my MATLAB function in Simulink raises with slope?

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Berkin Birol
Berkin Birol 2018-11-16
评论： Berkin Birol 2018-11-21
Hello everyone,
I tried to implement my own pulse generator with variable inputs. When I simulate it and compare results with the build in Pulse Generator I see that my output becomes high with a slope, but Simulink's Pulse Generator becomes high immediately. How can I have this kind of output?
Simulation performed for 100 seconds, with Fixed-step, discrete solver and Fixed-step size has been taken "1".
function [y, countTime] = fcn(Amplitude, period, width, phaseDelay, timeIncremental, Clock, pre_y, preCountTime)
%Setting previous values.
y=pre_y;
countTime=preCountTime;
%y is high for 'width' time, so it can be low again
if countTime==width
y=0;
end
%Counting the time between two high values
if y>0 || countTime>0
countTime=countTime+timeIncremental;
end
%Output is high first time after 'phase delay' passes.
if Clock==phaseDelay
y=Amplitude;
end
%Period has been reached, y is high again.
if countTime==period
countTime=0;
y=Amplitude;
end
pulseGeneratorOutput.png
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Berkin Birol
Berkin Birol 2018-11-16
Thank you for your reply. The solver was fixed step and in the same solver Simulink's own pulse generator works just fine. I think I miss something due to my lack of experience in Simulink.
Berkin Birol
Berkin Birol 2018-11-21
I solved the issue with zero order hold block and uploaded the block to: https://www.mathworks.com/matlabcentral/fileexchange/69483-customizable-pulse-generator.
But, I am still wondering if there is an another way(without ZOH) to do this.

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