TMS320F28377D: sine-wave generation with epwm-modules

Basti36

Part Number: TMS320F28377D
Other Parts Discussed in Thread: C2000WARE

Hello Community,
i want to use ePWM-Modules to produce 3 sine-waves (different phaseangle) to control a inverter. The Inverter should be possible in the future to drive a PMSM, but for the moment I want a solid sine-wave-Frequence and only want to influence sine-wave amplitude.
I read about a software-sine-wave-generator. -->SGENTI_3
This I want to use to control the ePWM-Modules.
1.Is that the right way or am I wrong?
2.This Generator is used to produce every cyle a value for example to feed "CMPA" to generat the Sine-Wave-shape?
3.For edge synchronous I think I understand how to use this, but can I use this Generator even for center synchronous ePWM? When, how can i do it right?
4.Is there any application Note or Code Example for this task, that would be helpful to read?

thanks in advanced
basti

over 7 years ago

0 Frank Ankapong over 7 years ago

TI__Mastermind 28275 points

Hi Basti,

We have a gpdac example in C2000Ware that generates a sine wave using the SGEN library, "buffdac_sine". Have you looked into that? Alternatively, if you want to use the EPWM as the DAC, you can use the same example code but modify the part that writes to the GPDAC.

0 Frank Ankapong over 7 years ago in reply to Frank Ankapong

TI__Mastermind 28275 points

Hi Basti,

Are you still having issues with this or did the suggestions help you figure it out?

0 Frank Ankapong over 7 years ago in reply to Frank Ankapong

TI__Mastermind 28275 points

Hi Basti,

It's been a few days since we heard back from you so I'm going to assume you resolved your issues and will be closing this thread. You can reply to reopen however if this thread locks out due to inactivity, you can always create a new one.

0 Basti36 over 7 years ago in reply to Frank Ankapong

Intellectual 490 points

hello,

Sorry for the long waiting time. I‘m on a travel since last week and have a weak internet-connection, but I checked your replies. I started this question to get new thougts and take these thougts throught the time to think about the task. Thanks for the tip about the example. The DAC is not the Way for me, because I want to use PWM and only hide in the on- and off-times the „information“ of sine-waves.

regards basti

0 Frank Ankapong over 7 years ago in reply to Basti36

TI__Mastermind 28275 points

No worries Basti, just wanted to make sure you were being adequately helped. As i mentioned before, if you don't want to use the DAC, you can still re-use the same example code but replace the portion that writes to the DAC with PWM-DAC code.

0 Frank Ankapong over 7 years ago in reply to Frank Ankapong

TI__Mastermind 28275 points

Hi Basti,

Do you have any further inquiries on this topic? If not, I'll be closing this thread.

0 Basti36 over 7 years ago in reply to Frank Ankapong

Intellectual 490 points

Hi Frank,

i will try your instructions on the weekend or next week, when i‘am back at work. Thanks so far. If got further questions I start a new thread. regards Basti

0 Frank Ankapong over 7 years ago in reply to Basti36

TI__Mastermind 28275 points

Ok Basti, sounds good.

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TMS320F28377D: sine-wave generation with epwm-modules