TMS320F28384S: One question of ePWM Trip Zone Submodule

Luke Chen

Hi champs,

If we use Trip Zone submodule to force ePWM1A = Hi and ePWM1B = Low, there have no dead band between these two outputs, is this correct?

How can we handle ePWM dead band when using Trip Zone function?

Regards,

Luke

over 5 years ago

0 Nima Eskandari over 5 years ago

TI__Guru 52220 points

Yes the TZ module comes after the deadband module.

So you can definitely do it with CLB. 100%.

BUT if you want to do it with EPWM, maybe the valley switching delay feature:

Then use the DCEVTFILT to trip the other signal.

Nima

0 Luke Chen over 5 years ago in reply to Nima Eskandari

TI__Expert 5090 points

Nima,

Yes, valley switching delay will work for this case.

I think event filter should be another solution, for example we can use DCAEVT2 to trip ePWMxA and use DCEVTFILT(from DCBEVT2) to trip ePWMxB with event filter window delay, then we can do ePWM dead-band.

How do you think?

Regards,

Luke

+1 Nima Eskandari over 5 years ago in reply to Luke Chen

TI__Guru 52220 points

I think both are possible options. I like the valley switching delay to see if we can delay the DCFILTEVT trigger.

Nima

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TMS320F28384S: One question of ePWM Trip Zone Submodule