An IGBT driver protection method applied to NPC three-level topology

The MW-class high-power NPC three-level inverter is prone to electromagnetic interference during operation, which will cause abnormal driving signal, damage of IGBT and other problems. The current IGBT driver protection technology can not avoid this problem well. In this paper, an integral protection method for bridge arm is proposed. This method can monitor all the driving signals of the whole IGBT bridge arm in real time and realize the driving logic protection and timing protection through the driving pattern recognition technology. Simulation results demonstrate the effectiveness of the method.