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CCS/TMS320F28335: How to get a SPwm signal

Juan Verdin

Intellectual 300 points

Part Number: TMS320F28335
Other Parts Discussed in Thread: CONTROLSUITE

Tool/software: Code Composer Studio

Hi.

I'm working with an inverter and it requires a type spwm signals to switching, I honestly do not know how to do it, i have only gotten pwm signals with the epwm module but i do not know hot to make the comparision with a sinusoidal one. Someone could tell me about how to do it?

over 7 years ago

0 Cody Watkins over 7 years ago

TI__Mastermind 42195 points

Juan,

you will need to generate a sine table and then adjust your CMPA value every cycle based on the values in that sine table.

This post describes it in some more detail. https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/595264

Regards,
Cody

0 Juan Verdin over 7 years ago in reply to Cody Watkins

Intellectual 300 points

Hi Cody,

Ok, Could you tell me How to generate a sine table? What values do I take ?

0 Cody Watkins over 7 years ago in reply to Juan Verdin

TI__Mastermind 42195 points

Sure!

For F28335 we actually have a library which will help with sine table generation.

Download controlSUITE and look in: "C:\ti\controlSUITE\libs\dsp\SGEN\v101".

You can find exampes in the "example_ccsv4" folder.
You can find the documentation in the "doc" folder.

Best of luck!
Cody