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Original question:

TIDM-1000: To operate TIDM-1000 at input line frequency 400Hz

TIDM-1000: ADC and compactor subsystem (CMPSS )

Annu Sheoran
Prodigy 120 points

Part Number: TIDM-1000

Hii

I am working TIDM 1000 for power factor correction application. I am not able to understand the role of CMPSS in my controller.

As shown below for inductor current measurement ADC with CMPSS is used. why we are using the CMPSS with ADC .

Question 2: How CMPSS will effect the my PWM generation

Question 3: how to disable the CMPSS ?And what happened if i disable the CMPSS (Because it is for over current and voltage protection) ?

Please help me to understand .

Regards

Annu

  • 0
    TI__Expert 6020 points

    Hi Annu,

    1.  "I am not able to understand the role of CMPSS in my controller" Each CMPSS module inside C2000 is designed around analog comparators. Refer device F28004x Technical reference manual for device specific usecase. Each CMPSS high/low uses mux selection from specific analog pin only. 

    2. "Question 2: How CMPSS will effect the my PWM generation"  Mainly, its preferred for board protection or preventing failure of switches. For example, whenever high inductor currents are seen, you dont want to run the PWMs continuosly which might damage the hardware. at those instantces driving the PWMs low for some period is ideal. refer TRM - this talks clearly on different use cases. 

    Question 3: As mentioned its for overcurrent and overvoltage protection conditions to prevent hardware failure . Yes, there are options disabling CMPSS, it depends on the user requirements. 

    Best Regards,

    Uttam

  • 0 in reply to Uttam Reddy Pailla
    Intellectual 535 points

    Hi,

    Could you please tell us the conditions that disable the PWM other than over current and output over voltage?

    Will the voltage/phase imbalance between 3 phases disable the PWM?

    With regards,

    Selvam

  • 0 in reply to selvam perumal
    TI__Expert 6020 points

    Hi Selvam, 

    you can use trip zone module or event trigger in the EPWM modules to force change your EPWM outputs as required. This could also be done through SW force AQ changes as well depending on your trip source. refer ePWM module 

    Regarding your query on "Will the voltage/phase imbalance between 3 phases disable the PWM?" 

    it depends on how much imbalance we are talking about. if its a minor it shouldnt matter. If it is severe, as we dont have any algorithm implemented for imbalance AC input, it will trigger protection most probably. 

    Best Regards,

    Uttam

  • 0 in reply to Uttam Reddy Pailla
    Intellectual 535 points

    Hi Uttam,

    Thank you for your response

    May I know ,which module will monitor the voltage/ phase imbalance?

    I would like to disable that imbalance protections to meet MIL-STD-704 test cases.

    Hope the output over voltage protection and over current protection is sufficient to protect the hardware .

  • 0 in reply to selvam perumal
    TI__Genius 16085 points

    Hi Selvam,

    selvam perumal said:
    May I know ,which module will monitor the voltage/ phase imbalance?

    This can reply on the ADC value. But I am sure how the original imbalance protections are implemented in your solution.

    Regards,

    Chen