INSULATED GATE BIPOLAR TRANSISTOR (IGBT) DRIVE CIRCUIT

摘要

The present disclosure provides an IGBT drive circuit, comprising an optical coupler chip and a power amplification circuit. The optical coupler chip comprises an isolation amplification unit and a fault protection unit. The fault protection unit comprises a desaturation module and a fault feedback module. The desaturation module is used to send an alarm signal to the fault feedback module if it is detected that an electric potential of a collector in an IGBT is too high or the electric potential of the collector in the IGBT changes too rapidly. The fault feedback module is used to send a fault control signal to an external controller after receiving the alarm signal, thereby controlling an external drive signal outputted by the external controller, so that the isolation amplification unit outputs an IGBT drive signal to control a turn-off of the IGBT.