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Bi-Directional, Isolated, Dual Full Bridge, DC/DC converter control.

Alex Szakaly
Prodigy 30 points
Other Parts Discussed in Thread: UCC2895, UCC28950, PMP7246, LM5170

Does TI manufacture any control integrated circuits for controlling the dual full active bridge, bi-directional power flow, with isolation, DC/DC converter? …. either in phase-shift or ZV transition or LLC modes?  I would be interested in a solution using dedicated control integrated circuits , as opposed  to a DSP or FPGA solution...i.e. no firmware requirement. Even a solution using multiple existing full-bridge control ICs, like the UCC2895...etc would interest me.      

  • 0
    TI__Genius 13660 points
    Hi Alex,

    Thank you for your question, I have asked my colleague to help here.

    Regard,
    Teng
  • 0 in reply to Alex Szakaly
    TI__Genius 9790 points

    hi, Alex

    UCC28950 can support your request, please refer to below reference design.

    http://www.ti.com/lit/df/slur676/slur676.pdf

    www.ti.com/.../tidu656.pdf

    You can search PMP5726 and PMP7246 on web, which is the reference design for your requirement.

    regards,

    Yunsheng

  • 0 in reply to Yunsheng Qu
    Prodigy 30 points
    Hi Yunsheng,
    Thanks for these references, but none of them appear to cover the performance in "reverse power flow" mode.....i.e. from "Output to Input", in addition to from "Input to Output" (the conventional direction of power flow). I need the converter to regulate the "output" voltage "up" when delivering power to the load, and to regulate the "output" voltage "down" when accepting power from the load...i.e. no change in output voltage (within regulator precision), when delivering or absorbing power. The converter's input voltage, on the other side of the isolation barrier, is regulated constant by the previous stage, for both directions of power flow.


    Alex.
  • 0 in reply to Alex Szakaly
    TI__Genius 13660 points
    Hi, Alex

    Sorry for confusing you, the reference design PMP5726 and PMP7246 shows the Phase shift full bridge can support 2 quadrant application. The output current could be reverse when output voltage is decreasing linearly.
    The reference design PMP5726 and PMP7246 would not be real Bi-directional DCDC application, because real Bi-directional DCDC application like battery backup system would detect:
    a. Input voltage
    b. Output voltage
    c. Output current for constant current control
    So I don’t think UCC28950 can support such Bi-directional application, then I suggestion to consider digital solution. Here is reference design.
    www.ti.com/.../tidud04.pdf

    BTW, LM5170 is analog buck-boost controller can support non-isolate Bi-directional application.

    Yunsheng,
    Regards