I am simulating my circuit at simulation time which is 1e-7 and my sample time for a part of circuit is 20e-6 sec. Why my result of overall circuit is affected by simulation time where i am keeping my sampling time constant?
Let me if you could not get my question.
In your case your simulation time is less than sample time. We start our simulation at say time = 0 and continue the simulation till time = simulation time. However, the calculations are done only at n*sample time, where n is an integer. Therefore sample time must be less than the simulation time. Please check .
Sample time should be smaller then the simulation time. Because sample time represents the sampling period after which MATLAB will fetch the data for reading. If your simulation time is lesser then the sampling time then there is no data fetched for the simulation.
Hi Sagar, In Simulink the simulation time is determined by the solver which is in your case is 1-7 , try to use discrete solver if it is possible.
Hi
I advice you to see these documents. You will find what you need.
Best regards
http://fr.mathworks.com/help/simulink/ug/types-of-sample-time.html
http://fr.mathworks.com/help/simulink/ug/how-to-specify-the-sample-time.html
If you are simulating your circuit at 1e-7 ss, your sample time should be < 1e-8 s. Maybe much smaller. The smaller, the better.
Your sample time should less than 1e-7, if no aliasing effect will exist
In your case your simulation time is less than sample time. We start our simulation at say time = 0 and continue the simulation till time = simulation time. However, the calculations are done only at n*sample time, where n is an integer. Therefore sample time must be less than the simulation time. Please check .
Thank you for your reply but I have specific problem where my switching time is 20e-6 and sample time for particular part of circuit is 100e-6 and Sample time for simulation (discrete solver) is 1e-7. Is it proper combination ?
Dear Sagar,
You may try to use "Variable Sample Time" or "Asynchronous Sample Time" in Simulink. Variable Sample Time: Blocks that use a variable sample time have an implicit SampleTime parameter that the block specifies; the block tells Simulink when to run it. The compiled sample time is [–2, Tvo] where Tvo is a unique variable offset.
Asynchronous Sample Time: An asynchronous sample time is similar to a triggered sample time. In both cases, it is necessary to specify an inherited sample time because the Simulink engine does not regularly execute the block. Instead, a run-time condition determines when the block executes. For the case of an asynchronous sample time, an S-function makes an asynchronous function call.
I think this will solve your problem, All the best.
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