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3-Level Synchronous Buck-boost Converter (Boost Mode) Losses

MattO
MattO Contributor Level 1
edited August 2023 in General

HIya, I am simulating a 3L DCDC converter and i notice that the switching losses of the synchronous FET are 0W. Looking at the current waveforms it looks to be switching current, but in the negative direction.

Is this 0W correct?

Thanks

Matt

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Comments

  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 4

    Thank you for your post, it has been approved and we will respond as soon as possible.

  • ZMiller
    ZMiller Wolfspeed Employee - Contributor Level 3

    Hi Matt,

    The synchronous switch in this case will see the current flowing through the body diode during transitions, facilitating soft-switching of the device. The body diode model for the current PLECS models does not include reverse recovery loss, which would actually be shown in the synchronous switch, and with this limitation in mind the 0W being recorded by Speedfit is correct.

    I hope that clears things up!

    Thanks,

    Zack

  • TBhatia
    TBhatia Wolfspeed Admin - Contributor Level 5

    Hi, I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further

This discussion has been closed.