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fusion digital power studio- Need Help

Ishtiyaque Ahmad
Prodigy 135 points
Other Parts Discussed in Thread: PMP20873, UCD3138

Hi,

I am using fusion digital power studio for PFC Bridgeless . I would like to know I to add parameters in "Show/Hide plots:" window under Monitor section.

Thanks and regards,

Ishtiyaque Ahmad

  • 0
    TI__Genius 17090 points

    The GUI normally looks at all monitorable PMBus commands that are supported and has checkboxes to enable those.  If you want to monitor something else, I suspect the command is not currently supported, so you will need to add a command.  What do you want to monitor?

  • 0 in reply to Ian Bower
    Prodigy 135 points

    Dear Ian,

    Thanks for reply. I would like to monitor the reference current of my PFC, as I am facing problem in PID tuning.

    Regards,

    Ishtiyaque Ahmad

  • 0 in reply to Ishtiyaque Ahmad
    TI__Genius 17090 points

    Ishtiyaque, the fusion digital power studio isn't really designed to monitor something that fast.  I've found the best way is to put the current target out on an unused DPWM if you've got one.  That way you can put it on a scope next to the input signal and look at them both together.  But I'm not a PID tuning expert, far from it.  Our PFC PID expert has his own techniques which probably work better, I'm going to refer this message to him.  

  • 0 in reply to Ian Bower
    TI__Expert 7310 points

    Hi Ishtiyaque, just as Ian suggested, put the current reference into a PWM duty, send the PWM out through an unused DPWM pin, then go through a RC filter, use a scope to monitor the filter output. If your code follows TI PFC EVM code very well, usually the reference should be good.   

  • 0 in reply to Bosheng Sun
    Prodigy 135 points

    Thank you Ian and Bosheng for the suggestions, but how to put current target out on an unused DPWM. 

    Actually I have designed a mother board taken reference from "the PMP20873 reference design" and in it there is no ct sensing and I am using it for running my 1kW bridgeless PFC following the TI PFC EVM code. Yellow one is AC input current and green one is input AC voltage(120V 50Hz). Testing it for only 100 W power, current is not in good shape. I would like to is this a tuning problem or some problem in firmware.

    Regards,

    Ishtiyaque Ahmad

     

  • 0 in reply to Ishtiyaque Ahmad
    TI__Expert 7310 points

    Hello,

    Here is an example code for using an unused DPWM0 to monitor current reference:

    void init_dpwm0(void) // DPWM0 is used for debugging
    {
     Dpwm0Regs.DPWMCTRL0.bit.PWM_EN = 0;  //disable everything

     Dpwm0Regs.DPWMCTRL0.bit.CLA_EN = 0; //open loop

     Dpwm0Regs.DPWMPRD.all = 0x420; //10 bits plus time for update at end.
     Dpwm0Regs.DPWMEV1.all = 0;
     Dpwm0Regs.DPWMEV2.all = 100;

     Dpwm0Regs.DPWMCTRL1.bit.GPIO_A_EN = 0; //turn on DPWM0A

     Dpwm0Regs.DPWMCTRL0.bit.PWM_EN = 1; //enable OK here, because nothing will happen until DPWM and front end are globally enabled
    }

    Then in standard_interrupt.c,

    Dpwm0Regs.DPWMEV2.all = iv.i_target_sensed;

    Please note, TI PFC EVM code is for bridged PFC, it cannot be used to control totem pole bridgeless PFC.

  • 0 in reply to Bosheng Sun
    Prodigy 135 points

    Dear Bosheng,

    My PFC is not a totem pole bridgeless PFC, It is simply a bridgeless PFC but not ct sensed. I have used IC ACS716KLATR-12CB-NL-T to sense the input current. 

    So I would like to know since my bridgeless PFC is not a CT sensed, is any modification is required in   TI PFC EVM code.

    Regards,

    Ishtiyaque Ahmad

  • 0 in reply to Ishtiyaque Ahmad
    TI__Expert 7310 points

    Hello, PMP20873 is a totem pole bridgeless PFC. You said your design is copied from PMP20873, then why it is not a totem pole PFC? What is your topology? Where did you put the hall sensor?

  • 0 in reply to Bosheng Sun
    Prodigy 135 points

    Dear Bosheng,

    My topology is Bridgeless PFC and I have used sensor IC ACS716KLATR-12CB-NL-T at the input side (like shunt sensing) as shown in fig.

  • 0 in reply to Ishtiyaque Ahmad
    TI__Expert 7310 points

    Hello, this is a totem pole PFC topology, the TI UCD3138 PFC EVM code is for traditional PFC, does not work on this topology, you need to write your own code for it.

  • 0 in reply to Bosheng Sun
    Prodigy 135 points

    Dear Bosheng,

    Could you give some hit regarding the code for reference current generation for totem pole PFC topology.

    Regards,

    Ishtiyaque Ahmad

    ishtiyaque0ahmad@gmail.com

  • +1 in reply to Ishtiyaque Ahmad
    TI__Expert 7310 points

    Hello, please refer the following paper of how to generate current reference for hall sensor used in totem pole PFC:

    https://www.ti.com/lit/an/slyt718/slyt718.pdf?ts=1625152269540