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TIDM-02008: Bidirectional TIDA-01604

Pablo Ballonga
Prodigy 20 points
Part Number: TIDM-02008
Other Parts Discussed in Thread: TIDA-01604

Tool/software:

Translator

Hello,

My team is working on the TIDA-01604 reference design. We have tested all the builds and everything works correctly. For our product, we need bidirectional power conversion, so we are now using the TIDM-2008 code reference design for validation. Labs 5 to 7 worked perfectly. However, our problems start with Lab 8. After following the steps in the design guide, we obtain the following waveforms:

  • Purple: Current
  • Yellow: Voltage
  • Blue: VBUS

¿What could be happening?

Thanks!

Pablo

Thank you!

  • 0
    Prodigy 20 points
    Translator

    Translator

    Translator

    Hello,

    After proper PI tuning and offset calibration on the current sensor, I obtained the following waveform.

    I tried to play with paremeters on TTPLPFC_pwmDriver() function to decrease zero crossing spike. Modifying TTPLPFC_state_slew_max to 35 significantly reduced current spike, but not enough.

    Is there any other paremeter im missing to modifiy for a better performance at zero crossing?

    Thanks!

    Pablo

  • 0
    TI__Expert 3595 points

    Hello Pablo

    Apology for the response. Lab-8 is with resistive load and the issue is known to us. The reason is that the AC voltage is used in the controller as feedforward which has more transient with a resistive load. 

    This issue is not observed for lab-9 when the grid (Emulator) is connected. I suggest you to go ahead and test lab-9.

    Thanks

    Amir

  • 0 in reply to Amir Hussain
    Prodigy 20 points

    Hello Amir,

    Could you provide more information about this issue? Were you able to solve it? I'm using this lab to implement an off-grid voltage controller, and since the load could be fully resistive, I need the controller to work properly under this type of load.

    Any help regarding the implementation of an off-grid controller would be really helpful to us.

    If the answer is too complex to explain via forum, could we arrange a video conference?

    Thanks!

    Pablo

  • 0 in reply to Pablo Ballonga
    TI__Expert 3595 points

    Hello Pablo

    You can try removing the feedforward term from the current controller as shown below. After doing this, you also need to retune the PI controller parameter. Please make sure that all the protections are enabled and working while testing this.

    Just to make sure I am giving all my suggestion based on TIDM 2008 firmware.

    If you want inverter operation with a resistive load, you can also refer TIDM HV DC-AC reference design.

    Thanks

    Amir