A Self-Adaptive Blanking Circuit for IGBT Short-Circuit Protection Based on VCE Measurement

In order to determine whether the IGBT short-circuit fault occurs, the collector-emitter voltage V-CE of an IGBT has been detected in the IGBT gate drivers. The blanking circuit is needed in this kind of protection method to avoid the malfunction of the short-circuit protection during IGBT turn-on transient. However, this blanking circuit should be carefully designed for different types of IGBT modules. In order to make the IGBT short-circuit protection circuit suitable for the tolerance of IGBT modules, a self-adaptive blanking circuit combined with the aforementioned short-circuit protection method based on V-CE measurement is proposed. The analysis of the proposed circuit is given, and the experimental results are included to prove the effectiveness of the proposed circuit.