Simulink Electrical Op Amps

Hi all,

I am just wondering how do you connect a Triangle wave (or input a triangle wave) to an op-amp circuit ? The triangle wave models (sawtooth, triangle) are build in the Specialised Power System toolbox, which is in the form of a Simulink signal. I tried to use a Simulink-PS converter and connect the PS side to a Controlled Voltage Source, and had no luck. Anyone has any guide ?

Thanks

Answer 1

[hosein Javan]

your method is correct. this image shows a model that has been tested. what is the problem exactly? any error?

[Hong kit Chong]

I had errors before, maybe i've included the powergui and changed something in the model settings. It worked yesterday straight after i posted this question. Thanks!

Also another question : how do you do a frequency sweep ? I saw the chirp wave but not exacly sure how to examine the output with a scope, (e.g. low pass filter bode plot)

[hosein Javan]

you're welcome. in order to create a variable-frequency signal, you can use 1d look-up table. define your function in one period vs angle from 0 to 2*pi. now your look-up recieves angle. you can provide an integrator to its input that integrates angular frequency and provides the angle. this way you can have a variable-frequency signal with any frequency arbitrary at its input.

you can also modify the existing saw-wave generator in simulink library as the above procedure. but before that, you must disable its link, or you can Ctrl+U on it andcopy its content to another subsystem and attempt to modify it.