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UCC28950: Bidirectional Use

Chuchen Wang
Expert 3470 points
Part Number: UCC28950
Other Parts Discussed in Thread: TIDM-BIDIR-400-12

Hi,

Can a phase shifted full bridge converter using UCC28950 with synchronous rectification flow the power bidirectionally?

My main concern is the current sense that changes direction otherwise nothing else seems like a problem.

Thanks,

Chuchen

  • 0
    TI__Mastermind 27105 points
    Hi Chuchen,

    Thanks for your interest in UCC28950. I have not heard of successful use case of UCC28950 in a bidirectional power design. Please allow me to discuss this proposal with my colleagues and get back to you.

    Best Regards,
    Ben Lough
  • 0 in reply to Benjamin Lough
    TI__Mastermind 25570 points

    Hi Chuchen

    The main problem with the PSFB as a bidirectional dc/dc is that you will lose ZVS when the currents reverse because the current which drives the ZVS transition will be in the wrong direction. This may not be a problem at lower Vin - for example 48V nom, but loss of ZVS will cause significantly increased losses on a 400Vinput. The power circuit can be made to operate as a PSFB in one direction and as a push-pull in the reverse direction - this has been done in our reference design no TIDM-BIDIR-400-12 which you can see at http://www.ti.com/tool/TIDM-BIDIR-400-12?keyMatch=bidirectional%20phase%20shift%20full%20bridge&tisearch=tidesigns

    The UCC28950 isn't flexible enough to control this power train and the ref design uses a TMS320F2803 microcontroller.

    There are other approaches to bi-directional conversion - you could look up 'Dual Active Bridge' circuits for example and a Bidirectional full bridge LLC circuits have also been reported. Unfortunately I don't have any further details on these.

    Regards

    Colin