Multiple igbt short circuit detection and protection method and device

The invention discloses a method and device for short-circuit detection and protection of multiple IGBTs. The method steps are: 1) sending a driving pulse to each IGBT, the IGBT receives the driving pulse and drives the IGBT to turn on; 2) real-time detection of the voltage at both ends of each IGBT Value, judge whether it is greater than the preset short-circuit voltage threshold value, if yes, judge it as the IGBT internal open-circuit fault state and send the judgment result; 3) Convert the detected short-circuit voltage into a short-circuit current value and calculate the short-circuit voltage and short-circuit current The target multiple, judge whether the target multiple is greater than the preset multiple threshold value, if yes, reduce the driving pulse to negative level, and drive the IGBT to turn off; the device includes multiple short-circuit detection for real-time detection of IGBT faults and shutdown protection protection module. The invention has the advantages of simple implementation method, consistent protection parameters and the ability to perform unified and coordinated detection and protection for multiple IGBTs.