sampling time issue with c2000 F28379d and matlab simulation.

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mahesh reddy pundru 2020-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/507858-sampling-time-issue-with-c2000-f28379d-and-matlab-simulation

评论： mahesh reddy pundru 2022-5-21

IMG20200227104420.jpg

hello,

I am implementing a simulation for hardware in matlab. The simulink file is running at sampling time at 1e-4. At this sasmpling frequency, I am losing some samples, and ADC not taking total samples of voltage signal values above 2khz. Then i try to dump the simulink file at a sampling time 1e-6, it showing some error, and it not reaching the data to target also. the error like it showing is" code replacement library must provide entries for semaphore/mutex creation."I am running an induction motor at 1e-4 sampling time with an open loop. Now I am sensing the voltage signal at a switching frequency of 10 kHz through ADC in hardware. As per my design of the voltage sensing circuit will give a peak to peak 3.3v or less. But, input to the ADC and output of ADC is not matching. Then I thought of running my simulation at sampling time 1e-6 because of my sampling time at least ten times the switching frequency. Then I check the ADC through a function generator at sampling time 1e-4 of pulse generation wave with a duty of 50%. The rate of the pulse wave is initially 1khz later I varied the frequency, but the output of my ADC has not matched. Please tell me where I made a mistake in the simulation, what I do to run the simulation entirely at both sampling time 1e-4 and 1e-6.

The below-attached results are an image of my simulation at 1e-4.

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Rajanikant Metri 2022-5-21

Have you found any solution?

mahesh reddy pundru 2022-5-21

Hi Rajinikant ,

Do you want sense the voltages of inverter output. can you elabarate little more. I have faced the problem when inverter voltages is switching frequency components so that when we use ADC through matlab its sampling frequency is 1e-4. but switching frequency is aroud 5 to 10 kHz so i have not got samples. My friends used two boards of F28379D for sensing one board and another one for dumping code and generate pulses. the sensing one operate at 1e-5 sampling frequency.

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