How to simlatue the Spike behavior

Support Communities Switchmode Power Supply How to simlatue the Spike behavior

This topic contains 4 replies, has 2 voices, and was last updated by  Wen-Guo Lin 1 year, 3 months ago.

  • Author
    Posts
  • #39905

    Wen-Guo Lin
    Participant

    I try to simulate the Spike behavior of a Mosfet in a push pull converter(see the attach).
    I use a Coss capacitor to simuate the Coss of a Mosfet, and a inductor to simuate the leaguage of a transformer.
    The Coss and the inductor will introduce the spike of a Mosfet when it turns off.
    But my circuit does give me this behavior.
    Do I miss something? What should I do to simulate the Spike behavior of a Mosfet ?

    Attachments:
    You must be logged in to view attached files.
  • #39917

    Albert Dunford
    Participant

    You need to use the level 2 FET, double click on the FET and then where you see the “ideal” drop down change it to level 2.

    have a look at this tutorial video it should give you an idea of how to provide the parameters. This will provide you with a more realistic gate and switch transition characteristics.

    Level 2 is available for Diode, MOSFET, & IGBT

  • #39929

    Wen-Guo Lin
    Participant

    I use the level 2 Mosfet. No difference.

    Attachments:
    You must be logged in to view attached files.
  • #40038

    Albert Dunford
    Participant

    The 600 V rating of your Level 2 switch is also defining an internal zener voltage. You are getting a spike but it is being capped by the zener. Increase your fet voltage rating and the spike will show up.

  • #40190

    Wen-Guo Lin
    Participant

    I can’t catch it. May you refine my file to show up the spike?

You must be logged in to reply to this topic.