I want to change phase of up-down counter of epwm module which is not working in frequency higher than 25kHz.

Dear experts,

I am working on TI launchpad f28379D , where I am using epwm1 module to synchronize with epwm 4 and changing the phase value of epwm4 via input port , setting the TBPHS value for 0 for Tsampling time (2cycle duration of up-down counter ) and TBPRD/2 or Tsampling time (2cycle duration of up-down counter ). My system is working well for frequncy lower than 25kHz but for higher frequency phase synchronization is not happening .Can any one please tell me what should I do?

Answer 1

[Balavignesh]

Hi TDR,

It is my understanding that you are working with the TI Launchpad F28379D and encountering issues with phase synchronization at higher frequencies when using ePWM modules. Below are a few suggestions that could help you resolve the issue. I suggest you try these:

• Ensure that the clock settings for the 'ePWM' modules are correctly configured. Higher frequencies require precise clock settings to maintain synchronization.
• Incoorect dead-band settings can cause phase misalignment. Verify if the dead-band settings are appropriate for higher frequencies.
• Make sure that the synchronization scheme between 'ePWM1' and 'ePWM4' is correctly implemented.
• Higher frequencies might lead to higher interrupt latency, which can affect synchronization. Optimize your interrupt service routines for minimal latency.
• Try increasing the timer resolution.

Kindly have a look at the following documentation link to have more information on:

• TI F28379D: https://www.mathworks.com/help/ti-c2000/ug/getting-started-with-C2000-example.html#d126e14881:~:text=for%20your%20convenience.-,Task%202%20%2D%20Create%2C,-Configure%20and%20Run
• Synchronization: https://www.mathworks.com/help/ti-c2000/ug/time-base-counter-synchronization-epwm-example.html

Hope that helps!

Balavignesh

[TDR]

Hello Balavignesh,

I have solved the problem ,there were an issue with parameters setting .Dead band setting you hightligthed that is new to me thank you verymuch for your reply. Now I am able to to operate my system at 100 kHz frequecy but again MATLAB is not working well with lesser than 2 micro sec sampling time with F28379D.