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UCC28951-Q1: Current Sense Transformer

Felix Guthan
Prodigy 30 points
Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28950, UCC28951

Hello design support,

I have a question regarding the placement of the current sense transfomer (CT). Does it matter if it is placed in the high or low path?

So I would like to place the CT between the full-bridge and GND. There shouldn´t be any problems regarding the primary current sensing by doing so or?

Thanks in advance.

  • 0
    TI__Guru* 85576 points

    Hello,

    I am reviewing you inquiry and will get back to you shortly.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 85576 points

    Hello,

    I don't think it matters if you place it on the low side or high side of the H Bridge.  However, I have never put the transformer in the low side of the H Bridge in phase shifted full bridge (PSFB) designs that I have done myself.  I have reviewed many H Bridge designs and have not seen this approach applied.

    It maybe worthwhile for you to evaluate this approach in an actual design to just make sure.   The following link will bring you to a 600 W evaluation module using the UCC28950 controller, which is parametrically the same as the UCC28950.  You may want to order this model and modify it to use your current sensing approach and test it steady state and large signal transients just to make sure there no issues with it.

    https://www.ti.com/lit/pdf/sluub02

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 85576 points

    Hello,

    If you do have a question regarding the UCC28951 vs the UCC28950.  The following link will bring you to an application note discussing the differences. 

    https://www.ti.com/lit/pdf/slua853

    Please note if this resolves your issue to check resolved in the thread.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 85576 points

    Hello,

    Just checking in.  Did this resolve your issue.  If it did, could you please select resolved at the end of the thread?

    Regards,