PSIM Gating Block for non-ideal MOSFET

Oscar_Mike619
Oscar_Mike619 Altair Community Member
in Community Q&A

Howdy PSIM users
I am using Gating blocks to generate unique patterns of PWM signals to drive switches in my converter.
This works well for ideal switches however I need to use the same PWM sequence for Level-2 MOSFET models, which is not supported.
Please advise.

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Answers

  • VSiddhartha
    VSiddhartha
    Altair Employee

    Hi,

    For level2 MOSFE need to select "control to model" as shown in figure.

    image.png

    This might be one of the possible errors. Please check once.

    Further, a detailed article on switches is available here:

    PSIM switch models: Choose Wisely! — Altair Community

    Thank you,

    Vishwanatha Siddhartha

  • Oscar_Mike619
    Oscar_Mike619 Altair Community Member

    Thank you for your response

    I am aware of the "control to model" option in the on-off controller block.
    I am using "a Gating block," which is like a lookup table on turn-on and off times.
    I am using this because I am implementing a unique switching pattern, which cannot be emulated by voltage sources.
    However it only allows direct connection to the gate of an ideal FET/ switch. It will not connect directly to a level 1/ 2 model or to an "on-off controller- multi-level" block.

  • VSiddhartha
    VSiddhartha
    Altair Employee

    Hi,

    It would be helpful to have the schematic file or any sample schematic, as it is difficult to fully understand this without it.

    Thank you,

    Vishwanatha Siddhartha

  • Ju4n_R0sales
    Ju4n_R0sales
    Altair Employee

    Hi Oscar!

    An alternative I can think of is using the piecewise linear source + a resistor. Another option is using a lookup table and a controlled voltage source. In both cases you would need to define points in time instead of an angle in degrees.

    We'll ask around maybe there's another solution.

    • Juan
  • NikosDimitrakopoulos
    NikosDimitrakopoulos
    Altair Employee

    Hi all,

    Based on Juan's comment, you could drive the gate like this:

    image.png

    The LuT should contain time vs Vgate info. You can find more details about LuTs here: https://community.altair.com/discussion/38451

    BR,

    Nikos

  • Oscar_Mike619
    Oscar_Mike619 Altair Community Member

    Thank for the responses.
    I am doing the following: As the "Gating block" can only drive ideal FETs, I am driving an ideal FET with it, and inverting the drain terminal voltage to the input of a "multi-level on-off controller".
    A suggestion to the devs: the "Gating block" should have a mechanism of driving non-ideal FETs.

    image.png

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