TMS320F280049: Multiple Epwms Synchronization

Jack Tan80

Part Number: TMS320F280049

Dear C2000 expert,

One of my power requires to minimize current and voltage ripple, and would like the 2 EPWMs has specific synchronizatio. Please see below time counter picture.

EPWM1's frequency is 200Khz

EPWM5's frequency is 100Khz

And EPWM5's counter needs to delay a counter compared to EPWM1's counter, can you please help me know how to realize it? Thanks...

over 5 years ago

0 Nima Eskandari over 5 years ago

TI__Guru 52020 points

We have an example for synchronization and how to configure the ePWMs.

http://dev.ti.com/tirex/explore/node?node=ANQtAx1d.2Tq4rBvalR55g__gYkahfz__LATEST

0 Jack Tan80 over 5 years ago in reply to Nima Eskandari

Mastermind 7110 points

Hi Nima,

Thanks for this info. But the example shows the all epwm has the same frequeny.

In my case, the master(EPWM1) epwm's frequency is twice as slave epwm(EPWM5), that means the sycnout signal from the master can be prescaled, or the syncin signal in slaver epwm can be precaled. Is it possible to realize it?

Thanks...

0 Jack Tan80 over 5 years ago in reply to Nima Eskandari

Mastermind 7110 points

Dear C2000 expert,

May I have some update from yours?

As show in my first post diagram, the master(EPWM1) epwm's frequency is twice as slave epwm(EPWM5), is it possible to realize it? Thanks...

0 Jack Tan80 over 5 years ago in reply to Jack Tan80

Mastermind 7110 points

It almost 2 weeks passes away. May I have some update here?

0 Nima Eskandari over 5 years ago in reply to Jack Tan80

TI__Guru 52020 points

What you have to compensate for is that the TBCTR for slave EPWM will set to TBPHS value on EACH synchronization signal. So you would need to make sure that is taken care of in your application software. You would basically need to generate the SYNC event every two ePWM periods from the master, so in your application you would need to toggle the SYNC signal to enable and disable on every PERIOD.

Built into the ePWM module, is the ability to load TBCTR with TBPHS on ANY SYNC event. If you require a slave PWM to sync with a master that is double the frequency, you need to make sure to take care of the extra SYNC signal in software.

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049: Multiple Epwms Synchronization