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TMS320F28335: TMS320F28335

Manish Girase
Intellectual 370 points
Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

Dear Sir,

Working on Grid tied Voltage source Inverter using TMS320F28335. Generating output as per the reference AC sine input.
AC input is scaled down and sampled . At low voltage the output follows perfect sine output. As the input increases the
output deviates from sine nature and PWM signal gets saturated at top.Need advice how to do scaling
while doing PWM output.

  • 0
    TI__Intellectual 810 points

    Suggest to refer to the following released reference design by TI C2000 team. The corresponding s/w is found in the C2000Ware Digital Power SDK. You can find the link on the same web page.

    https://www.ti.com/tool/TIDM-HV-1PH-DCAC?keyMatch=TIDM-HV-1PH-DCAC

  • 0 in reply to Zhenyu (Zhen) Yu
    Intellectual 370 points

    Thanks for your reply. I had gone through the above application. But unfortunately not able to locate solution for my problem.

    The output should follow the input AC signal. As the AC input increases the PWM output gets saturated at the top which ultimately changes my output. If I scale the Input AC signal then inverter output also decrees. If I add some dc reference to maintain the DC voltage then again PWM gets saturated at top. Please advice how to set PWM timer registers so that it can work  for entire input signal.

    Thanks for your support

    Manish Girase

  • 0
    TI__Intellectual 810 points

    You need to follow the instructions in the user's guide: file:///C:/Users/a0322359/Downloads/TIDUAY6E.PDF

    Per unit variables have been adopted to represent the variables.

    Based on the questions you are asking, it seems you want to run build level 3. If you read the instructions for buid level 3 and look at the block diagram, you will notice the the variable invVoRef is what determines the magnitude of output voltage, 1 representing maximum possible output for the givne bus voltage.

    You can also experiment with build level 1, which is open loop testing, and build level 2, which is closed current loop testing (with open voltage loop).

    Finally, you can also run buid level 3 in demo mode which allows you to set the AC output voltage.

    Hope that answers your question.