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Chopper Frequency control Using 320F28335

Shahid Atiq
Intellectual 305 points
Other Parts Discussed in Thread: TMS320F28335

Hi everybody

I am using TMS320F28335 with 150MHz SYSCLKOUT. I want to use 10KHz carrier frequency for my inverter. But from the settings available in ePWM module Chopper Control Register PCCTL I can get minimum 1.56MHz chopper frequecny usin 100MHz SYSCLKOUT or 2.34 MHz chopper frequency using 150 MHz SYSCLKOUT. Is there any way to get 10KHz chopper frequency using above mentioned hardware?

Best Regards

Shahid

  • 0
    Guru 192875 points

    Hi Shahid,

    If you check the following table, Chopping Clock Frequency is directly dependent on SYSCLKOUT. Hence for further reducing the chopping frequency you'll have to reduce SYSCLKOUT.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Intellectual 305 points

    Hi Gautam

    From this table its obvious the minim chopper frequency. But it seems illogical that such a controller have this kind of limitation. Because if I reduce the SYSCLKOUT, it means I am reducing speed for all other peripherals that is not desirable.  Any way I thought may be there is some other way to reduce the chopper frequency. Thanx for your help. I have also some questions regarding generating variable frequency ePWM based upon Hall sensor feed back from my PMSM if you can help me?

    Best Regards

    Shahid Atiq 

  • 0 in reply to Shahid Atiq
    Guru 192875 points

    Because if I reduce the SYSCLKOUT, it means I am reducing speed for all other peripherals that is not desirable.

    Very True...!

    I have also some questions regarding generating variable frequency ePWM based upon Hall sensor feed back from my PMSM if you can help me?

    Simply shoot.... If not me there are others to help :)

    Just that, as you've a new query -> a new post it should be for better response.

    Regards,

    Gautam