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TMS320F280039C: PFC Kit with DFF control?

Ari Mendes
Intellectual 405 points
Part Number: TMS320F280039C
Other Parts Discussed in Thread: TIDM-HV-1PH-DCAC, TIDM-1000

Hi,

I found the post below very interesting

https://e2e.ti.com/blogs_/b/powerhouse/posts/how-to-improve-power-factor-correction-with-dff

I would like to know if Texas has released any C2000 kits or application notes that use DFF control?

  • 0
    TI__Genius 11495 points

    Please see TIDM-HV-1PH-DCAC on ti.com

    The control diagram shows the feed-forward control

    Shamim

  • 0 in reply to Shamim Choudhury
    Intellectual 405 points

    Shamin,

     The documentation of the tidm-1000 (tiducj0g.pdf) 

    in equation 13 (6.4.2)


    duty1PU = ( ( iL1Meas  - iL1Ref )  * Gi_GainKp + v1Meas) / vBusHalfMeas


    I don't understand why duty cycle feedforward is v1Meas/VbusHalfMeas. In this case the duty is smaller when V1Meas is small in relation to Vbus. Shouldn't it be (Vbus - V1meas)/Vbus? So that Duty is bigger when V1meas is smaller?

  • 0 in reply to Ari Mendes
    TI__Genius 11495 points

    This equation comes from the current loop model shown in Fig 5, page 9. You should be able to derive this by looking at the diagram.

    When output volt (V1Meas) is smaller then duty is smaller because Vbus is constant.

    Shamim