How to calculate MOSFET losses in an inverter topology at different power levels?

Altair Forum User
Altair Forum User
Altair Employee
edited August 2023 in Community Q&A

I want to simulate an inverter topology using PSIM thermal module to calculate MOSFET switching and conduction losses at different power levels. How I can adjust different power levels in grid-connected inverter topology (for example 100%, 75%, 50%, 25% of total power) and calculate losses at each level?

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2023

    What sort of load are you looking to use? The easiest thing to do is to use a parameter file and define and R and an L value for an RL load. Then simply define the desired VA and PF and then split those apart into the correct R+jX values you need. The equations can be defined in the parameter file so that you just input the VA and PF and the R and L jump out at the bottom.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2023

    <image

     


    This is my circuit. Now guide me how I can calculate losses at different power levels?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2023

    Hi,

    First you need to swap in the actual thermal devices from the database and not use the base ideal switches.
    2nd) You would be well advised to write a script, please consult the examples\script folder and tutorial for the script functions in help->tutorials. The script will be able to change the load for you and compile results while you have a coffee.

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