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high side mosfet offset voltage in Phase shifted full bridge converter

Discussion in 'Power Electronics' started by vkurapati, Nov 20, 2018.

  1. vkurapati

    vkurapati

    1
    0
    Nov 20, 2018
    I am working on phase shifted full bridge converter. The input voltage of it is 300 V.

    The issue is I am able to see offset voltage (shown in fig below) in the gate to source pulses during turn-off period of high side MOSFET when input voltage of 300 V or even less than that applied to it.

    Without input voltage applied the gate to source pulses are clear and there is no offset. This issue was happening only on high side MOSFETs but at the low side MOSFETs the things are not same as upper MOSFET there is no offset voltage.
     

    Attached Files:

  2. CircuitMaster

    CircuitMaster

    42
    0
    Dec 17, 2016
    Designing a full bridge inverter is not an easy job. Can you post a circuit?
     
    Last edited by a moderator: Dec 7, 2018 at 8:25 PM
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