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Bidirectional current sense transformer?

Discussion in 'General Electronics Discussion' started by eem2am, Feb 21, 2014.

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  1. eem2am


    Aug 3, 2009
    We are doing a 650W synchronous buckboost converter (as a variable current regulator) using LT3791-1 controller.
    Max current is 25 Amps output. (Vin = 18 to 32V), fSW = 200KHz.
    We wish to use a current sense transformer instead of a resistive current sense.
    However, the LT3791-1 senses the current that flows from drain to source when in boost mode, and from source to drain (the other way), when in buck mode.
    Will it be possible to use a current sense transformer in this case.?

    When Vin is very close to vout, the LT3791-1 operates in "buckboost" mode and the synchronous fets are switched so as to increase the current deviation, -will the current transformer be able to manage this?

    LT3791-1 Datasheet:

    LTspice sim and schematic attached

    Attached Files:

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