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Original question:
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.
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
