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  • TI Thinks Resolved

1xPWM mode logic check please...

Intellectual 350 points

Replies: 16

Views: 618

Hi,

I open new thread, because the original thread is locked.

Could you check the logic using 1xPWM mode with DRV8323RH?

  • Min-Su,

    The previous thread was closed because the issue was resolved.

    Could you explain your request? It is not clear to me what your issue is or what you are asking me to check.

    Regards,

    -Adam
  • In reply to Adam Sidelsky:

    Adam,

    sorry, the original thread was not resolved.

    When I use 1x PWM mode, motor rotates. But, the pwm logic is not same to data sheet.

    Could you check it ?

    Thanks
  • In reply to Min-su Kim:

    Min-Su,

    I need more clarification. Can you please include a table showing the issue or some scope images of the issue behavior?

    Regards,

    -Adam
  • In reply to Adam Sidelsky:

    Adam,

    I showed the scope images in the previous thread.

    GHx, GLx signal was cheked. But it was different from truth table with 1xPWM mode.

    Thank you.

  • In reply to Min-su Kim:

    Min-Su,

    Looking at your previous scope images, I don't see a problem. I need you to show me a new scope image which highlights the state which you are claiming is incorrect.

    Regards,

    -Adam
  • In reply to Adam Sidelsky:

    Adam,

    GHA is PWM, then GHB and GHC should be low.

    But, GHC is high and GLC is low

    you can see the scope iamges in the previous thread.

    first scope image showed GHB and GLB when GHA was PWM.

    GHB is low and GLB is high (<-- it means GHC and GLC should be low)

    second scope image showed GHC and GLC when GHA was PWM.

    GHC is high and GLC is low (<-- I think it is different from truth table.)

    thank you.

  • In reply to Min-su Kim:

    Min-su,

    What is the status of your 1PWM_COM bit?

    Do you have the three motor phase wires connected to the board and also the three hall sensor wires connected to the board?

    If you do, I think you have your phase wires mixed up, please make sure the hall input matches the phase input for all three phases.

    Regards,

    -Adam
  • In reply to Adam Sidelsky:

    Adam,

    I use DRV8323RH(hardware-interface). I left the mode pins open.

    I think motor wires and hall sensors are connected well. When I applied the power, motor rotates well.

    But I wonder the gate signals.

    thank you.

  • In reply to Min-su Kim:

    Min-su,

    Your hall inputs are probably not aligned with your motor inputs.

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

    Adam,

    I'm sure that hall and motor input connection is correct.

    You can see the movie clip using 1xPWM mode.

    https://www.youtube.com/watch?v=EKlaZy3hWHQ

    Thank you.

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