How to break the loop with a transferfunction?

Question

Amina Mokhtar 2019-10-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/484246-how-to-break-the-loop-with-a-transferfunction

回答： Sabin 2023-2-10

I am designing a synchronous boost converter. The output voltage has to be 50V. I have a mathematical design of the boost converter. I am sure that the design is correct I have verified all of the results by comparing them to another LTSpice model. My problem now is that I want to plot a Bodeplot but to do so my system has to be linearized. I did remove the switches, but my problem is now with the feed back loop which generates the varying PWM signal. When I run it I get the following error:

Simulink cannot solve the algebraic loop containing

So I have implemented a delay by using a transfer function(1/(3e-6s+1)). Because of this delay my output voltage rises to 150V