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TMS320F280049: Using CBC based trip with software forcefully controlled EPWM pins

Amtech
Genius 4535 points
Part Number: TMS320F280049

I am using EPWM module as software force controlled as shown with below code:

   

//TOP IGBT ON
EPwm1Regs.AQCSFRC.bit.CSFA = 2;

//TOP IGBT OFF
EPwm1Regs.AQCSFRC.bit.CSFA = 1;

I am also using OST based on DCBEVT1 to generate OST trip for short circuit condition protection.

Now I want to use CBC module to control output current and trip the module before reaching OST trip level using DC event.

Can I use CBC module, when EPWM module is configured as shown above (software forced controlled mode)?

Best Regards,

Rahul Patel

  • 0
    TI__Guru 50430 points

    Rahul,

    You can use the force action in Trip Zone itself, rather than using from Action Qualifier submodule.

    Thanks & Regards,

    Santosh

  • 0 in reply to Santosh Jha
    Genius 4535 points

    Dear Santhosh,

    Thanks for your prompt reply.

    I want to use both OST and CBC to protect the IGBT.

    I am using force control of EPWM module but that comes in the routine at its specific time. What if in between, due to some external factor current increases? To handle such situation, I am planning to use two limits of current to protect the power switching device. One for CBC functionality and other for OST functionality. OST functionality is tested based on DC events. But I want the EPWM module to also work as per CBC when current is below OST trip level but higher than normal level.

    So my question is simple:

    Do EPWM module support CBC functionality when the EPWMA/B are software forced controlled from DC events?

    Regards,

    Rahul Patel

  • 0 in reply to Amtech
    TI__Guru 50430 points

    Rahul,

    I did not get a chance to review the ePWM block diagram today. Let me review it and I will get back to you tomorrow.

    Thanks & Regards,

    Santosh

  • 0 in reply to Santosh Jha
    TI__Guru 50430 points

    Rahul,

    You can use both but there is a priory for conflicting action. I am pasting the snippet from TRM, section (18.11.4 Operation Highlights of the Digital Compare Submodule)

    Thanks & Regards,

    Santosh