• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 82 subscribers
  • Views 254 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TMS320F28377S: pwm sync

TMS320F28379D: External Synchronization for PWM1 to make TBCTR zero

rajesh beesetty
Expert 1355 points

Part Number: TMS320F28379D

Tool/software:

Dear Experts,

I am working on a SCR based rectifier. Ta realize this, I am using F28379D that generates delayed firing pulses for the 6 SCRs.

To realise this control, here is the idea I'm having in my mind:

1. Generate ZERO crossing of R phase.

2. SYNC VR with EPWM1.

Then a PI can be run that compares with the TBCTR.

The question I am having is, I don't find EXT EPWM1 SYNC on any pin! Please let me know if there is anything I am missing.

Thanks in advance.

Regards,

Rajesh.

  • +1
    TI__Mastermind 25970 points

    Hi Rajesh,

    The EPWM can have an external sync source by using the EXTSYNC signals found at the top of this TRM diagram:

    In order to use these EXTSYC signals, you need to route your external signal into the EPWM module using INPUT XBAR.

    So for example, you need to ensure your external GPIO is directed to Input XBAR's "INPUT5" to use EXTSYNC1.

    At a high level, you can think of the path as: external source --> GPIO --> INPUT XBAR --> INPUT5 -->  EXTSYNC1 --> sync source to EPWM

    Hope this helps clarify!

    Best Regards,

    Allison

  • 0 in reply to Allison Nguyen
    Expert 1355 points

    Thanks for the suggestion!