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Unipolar current sense transformer with Bidirectional current?

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cupoftea

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Hi,
The attached is a Buck converter for 37Vin, 6vout, 20A out.

When no_loaded, the inductor current freewheels back and forth, due to the synchronous rectifiers continuing to switch in no_load.

The current in the unipolar current sense transformer is thus “bi-directional” during times of no_load.

Would you agree, the Unipolar current sense transformer with resistive reset is the best one to use here? ..(Because there is no DC level in the secondary during the time when the Buck is on no load.)

Attached is LTspice sim and jpeg schem, including inductor current waveform, and Vout waveform. (load is switching from no load to full load repeatedly).
 

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  • schem_Buck with Unipolar current sense transformer.jpg
    schem_Buck with Unipolar current sense transformer.jpg
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  • waveforms_Buck with Unipolar current sense transformer.jpg
    waveforms_Buck with Unipolar current sense transformer.jpg
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  • Buck with Unipolar current transformer.zip
    3.3 KB · Views: 68

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