Semiconductor drive apparatus

摘要

A semiconductor drive apparatus includes a first control unit configured, when an overcurrent is detected flowing between a first main electrode and a second main electrode of a switching element, to make a gate of the switching element conductive with a predetermined reference potential, to make a control voltage applied between the gate and the first main electrode lower, and to turn off the switching element; a detection unit configured to detect a current generated accompanying charge or discharge of a feedback capacitance between the gate and the second main electrode; and a second control unit configured, when the overcurrent and the current generated accompanying the charge or discharge of the feedback capacitance are detected, to make a resistance between the gate and the reference potential lower.

主权项

1. A semiconductor drive apparatus comprising:
an overcurrent detection unit configured to detect an overcurrent flowing between a first main electrode and a second main electrode of a switching element; a first control unit configured, when the overcurrent is detected by the overcurrent detection unit, to make a gate of the switching element conductive with a predetermined reference potential, to make a control voltage applied between the gate and the first main electrode lower, and to turn off the switching element; a detection unit configured to detect a current generated accompanying charge or discharge of a feedback capacitance between the gate and the second main electrode, wherein a resistance of the detection unit and the first control unit are in series between the gate and the reference potential; and a second control unit configured, when the overcurrent is detected by the overcurrent detection unit, and the current generated accompanying the charge or discharge of the feedback capacitance is detected by the detection unit, to make a resistance between the gate and the reference potential lower, wherein the second control unit makes the resistance lower to a value less than a value obtained when the first control unit lowers the resistance.