SPICE Model – Junction Temperature Measurement in PLECS

Hello,

I am currently simulating a single-phase inverter using GaN switches with Spice PLECS. The GaN SPICE model I am using includes five thermal/electrical probes.

Has anyone here performed simulations with similar models?

I would like to understand the correct setup in PLECS for measuring junction temperature (Tj) and case temperature (Tc). At the moment, I am getting very unusual results for the junction temperature when observing Tj in the scope.

I would appreciate any guidance regarding:

  • Proper thermal network configuration

  • Correct connection of thermal nodes

  • Recommended settings for realistic junction temperature results

Thank you in advance for your help.

Best regards,
Yasser