Suppressing voltage glitches in SiC MOSFETs

Abstract:
Fast switching devices such as Silicon-Carbide (SiC) MOSFETs are affected by a common problem related to the induced Miller turn-on effect and the generation of glitch phenomena on the Gate-Source voltage. To better understand this phenomena, this paper looks at both the negative and positive voltage glitches that occur on the Gate-Source terminals of SiC MOSFETs during the turn on and off transients on a typical half-bridge DC-AC power converter topology. A suitable Gate driver with a Miller clamp function has been used to mitigate false turn-on behavior under fast switching conditions.