Use Simulation Time of Simulink in Matlab function when threshold is exceeded

Hello everybody,

I am currently having a problem with a matlab function which I want to implement in my Simulink Project. In this Matlab function, I want to create some sort of pulse train. Here, the incoming signal has to be compared to a threshold value (here 10000) at a specific time (here 1.7µs). If the incoming signal exceeds the threshold at the reference time of 1.7µs, a pulse train has to be created. This pulse train outputs a 1 every 0.8µs starting at 1.7µs. The pulse width is not of importance as I want to use this signal as a trigger for a sample and hold block afterwards. If the incoming signal does not exceed the threshold at 1.7µs, the output has to stay at 0. The problem now is that I dont know how to implement this.

Thank you in advance,

Thomas

Answer 1

[Fangjun Jiang]

Use Step block to specify time and value. This is your threshhold.

Use Comparator block to compare your incoming signal with this threshold. Use the output to control a Switch block.

Switch between whatever value and 'simulink/Discontinuities/PWM' block.