Study on Estimation Method of Stray Inductance and Its Influence on Switching Loss for SiC MOSFET

Silicon carbide (SiC) MOSFETs offer notable benefits such as fast switching time and low switching losses. However, the quick switching characteristics of SiC MOSFETs can generate high rates of dv/dt and di/dt, with the presence of stray inductance, giving rise to voltage and current oscillations. To address this issue, a novel method has been proposed to accurately estimate the stray inductance originating from wires or component leads. This method enables the determination of the ratio of each stray inductance to the loop inductance. Consequently, the switching characteristics are analyzed under different stray inductance from different lead lengths. The validity of these findings has been confirmed by experimental results.