How to vary offset during simulation

Hello, i need to vary the offset of a 60hz 180V sinewave during the simulation.

How can i do that? I am trying to use Step and Controlled voltage source, but it's not working.

Any ideas?

Thanks

[Fangjun Jiang]

what offset, phase?

[Luiz Souza]

Well, i need to vary the offset to:

0V->100V->50V->-20V during the simulation

Same phase

Answer 1

[Jesús Zambrano]

Hi Luiz,

You can include a slider (fomr the section Dashboard in the Library) in the Simulink model, and link it to the SineWave bias. Then you can change the bias during the simulation by moving the slider.

[Luiz Souza]

Ok, i'm gonna try, thank you!

But is there a way to vary the offset "automatically"? I need to do it in a determinate time.

Or maybe a block that pauses the simulation when it reaches determinate time.

Thanks

[Jesús Zambrano]

You can include a MATLAB function block with a piece of code to do this change in the time you want. See the screenshot below, where I use the 'Clock' block to ge tthe current simulation time, and when time is equal to 20, the bias is set to 10.

Another good option is to do it with simple blocks. Please read the following post with an example:

https://blogs.mathworks.com/simulink/2011/03/08/how-do-i-change-a-block-parameter-based-on-the-output-of-another-block/

Answer 2

[Fangjun Jiang]

So you need to generate V*sin(2*pi*f*t).

There is a block for sin(). Use "Repeating Sequence" or "Repeating Sequence Interpolated" from Simulink Source library where you can specify any time-value pairs.