Hello, I am exploring the thermal simulation calculation principle of MOSFETs in PLECS. I have set up turn-on & turn-off losses, conduction losses (gate on & off), and used a Cauer model in the Thermal Chain with defined thermal resistances and capacitances. I also created an Rgon table and an Rgoff table in Custom Tables. In the turn-on & turn-off loss settings, I selected “Lookup table and formula” with the formula:
E*(i>0)*lookup('Rgoff table', Rgoff, T)/lookup('Rgoff table', 5.1, T).
I would like to know: when calculating losses in PLECS, is it simply multi-dimensional linear interpolation? That is, when the simulation conditions are not exactly the values defined in the .xml file, does it draw a line between two adjacent points and take the interpolated value?
Also, if the selected Rg exceeds the range defined in the Rgon table and Rgoff table, what is the extrapolation strategy?