This paper presents a theoretical analysis and an optimized parameter design method of desaturation short-circuit protection for fast response speed and strong noise immunity. First, the mechanism of false triggering of desaturation protection are analyzed in detail, and based on the analysis several key related factors are identified. Second, a noise suppression ability evaluation method and a corresponding optimized parameter design method based on aforementioned analysis are proposed, which is capable of enhancing noise immunity without sacrificing response speed. Third, two typical desaturation protection circuits are compared with the proposed evaluation method and optimized parameter design examples are presented. Finally, simulation and experimental results are presented to validiate the proposed parameter optimization method.

Desaturation,Short Circuit Protection,wide bandgap devices