Buck converter control malfunction

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1

Hi, I am trying to control a buck converter, I implemented voltage control method and designed it on paper first, checked the TF via matlab and everything seems accurate till now.

Now I try to simulate toe boost and the output voltage is the same as the input voltage and I am really puzzled, I checked the buck analog control demo and copy pasted some stuff from there and still I get the same output.

I am thinking maybe the issue is from the op amp circuit, but I dont know how to navigate that.

thanks :slight_smile:

I attached the schematic, the output from the scope and the project.

BUCK cntr.png
BUCK cntr.png1898×902 23.7 KB

Buck cntrl 2.png
Buck cntrl 2.png1907×1025 29.5 KB

First control project.plecs (23 KB)

2

One point I could see is that the op amp power supply is not connected to ground. Could you please explain more about why you are adding some constant to modulating signal?