Hello. I have simulated a synchronous boost converter with thermal model for mosfets AIMDQ75R011M2H (attached). I noticed that I have switching losses for the synchronous mosfet (in model: M2) only when it turns on. The turn-off switching losses are zero. I searched a bit in Plecs forum and followed your advice to mirror the look-up tables for negative current values, but I get the same results ( Switching losses - MOSFET, negative current ). Also, if I add dead-time (1-2% of Tsw), switching losses do not change either.
In forum, I also found that:
“For turn-on loss, PLECS looks at the voltage directly before the switching event and the current directly after. For turn-off loss, PLECS looks at the voltage directly after the switching event and the current directly before.”
Is it possible for me to check which values Plecs takes into account around switching, in order to calculate the losses?
Is there anything else that I should take into account for calculating switching losses?
Thank you in advance,
Hara
Synchronous_Boost_losses.plecs (54.2 KB)