MOSFET Thermal Model Switching Loss Calculation

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

Hi,

I'm wondering if there is any documentation that includes the equations/methodology that PSIM uses to compute the switching losses for the MOSFET thermal model. In this case, the Eon and Eoff curves are not provided (as is the case for many traditional Si MOSFETs). I've attached the model details below.

I am trying to confirm the results seen in my simulation. I followed the theory in https://ietresearch.onlinelibrary.wiley.com/doi/full/10.1049/pel2.12252 to double-check and the results are within reason but I'm curious where the differences occur.

Thanks.

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Answers

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

    The thermal calculations are used for efficiency estimations and design of the cooling method.
    Thermal calculations in any simulation software depends on the accuracy of the information available. The thermal characteristics are mostly approximations of nonlinearities, if you go through the device datasheets and manufacturers' app notes.

    Small deviations exist between different calculation methods due to the approximation.
    As long as the results are within reason, different methods/simulations verify each other.

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