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TIDM-1000: Vienna Rectifier A to D Converter Usage

chris geraghty
Prodigy 80 points
Part Number: TIDM-1000


Hi, I have two questions regarding ADC usage in the TIDM1000 Vienna Rectifier, using the F2837 Control Card

First Question:

Of the eight sensed analog parameters, I see that four of them (IL1, IL2, VPM and VMN) are each fed to two separate ADC inputs

I see eight ADCIN (and three corresponding CMPSS for the currents only) defined in

Tidm1000 > f2837x > pfc3phvienna > Vienna_settings.h

And these all make sense.

But what is the purpose of the duplicated connections:

IL1 to ADCINB3/CMPIN3N

IL2 to ADCIN15/CMPIN4N

VPM to ADCINB4

VMN to ADCINB5

And where are these defined?

Second Question:

Including these duplicated signals, twelve ADC inputs are used; this leaves twelve more ADC inputs available. Is there any advice for choosing one of these for adding in one more analog signal (a remote temperature measurement)? I see ADCINA0 and A1 have other (DAC-related) connections on the Control Card, and that B0 and B1 have non-typical input terminations, so I would probably use one of the other eight. Is there anything else I need to be aware of here?

Many thanks

 

Chris

  • 0
    TI__Genius 15935 points

    Hi Chris,

    I checked the code and cannot find the duplicated code you mentioned. can you pls add a pic of the code?

    chris geraghty said:

    Tidm1000 > f2837x > pfc3phvienna > Vienna_settings.h

    And these all make sense.

    But what is the purpose of the duplicated connections:

    IL1 to ADCINB3/CMPIN3N

    IL2 to ADCIN15/CMPIN4N

    VPM to ADCINB4

    VMN to ADCINB5

    Regards,

    Chen

  • 0 in reply to Chen Jiang ti
    Prodigy 80 points

    I did not mention duplicated code - my question was why four of the eight signals each go to two separate pins on the micro:

    IL1 goes to  ADCINA2/CMPIN1P (which is defined in the "Vienna_Settings.h" file) and ALSO to ADCINB3/CMPIN3N, which i can't find a reference to in the code

    Similarly,

    IL2 to  goes to ADCINA4/CMPIN2P and to ADCIN15/CMPIN4N

    VPM to  ADCINC2/CMPIN6P and to ADCINB4

    VMN to ADCINC4/CMPIN5P and to ADCINB5

    While IL3 and the three AC voltages only go to one pin each.

    I would be grateful if you could explain what the second connections are for, and where the code defines their purpose

    Many thanks

    Chris

  • 0 in reply to chris geraghty
    TI__Genius 15935 points

    Hi Chris,

    The original h/w designer is not in TI. I took a look at the schematic which aligns with what you mentioned. I am not sure about the original intention. But since it is not configured in the released s/w, I will guess is for some initial test.

    Regards,

    Chen