This paper mainly briefly discusses several commonly used short-circuit protection of IGBT in low-voltage small and medium power system, and mainly introduces the way of using Vce detection.The working principle of short circuit protection and the rationality of protection circuit design are briefly explained.

Introduction of the short-circuit protection scheme In the common short-circuit protection design, the current sampling mainly has three ways, respectively: N-BUS (zero Line) shunt resistance detection, output Hall detection, Vce voltage detection.