OVERCURRENT DETECTION APPARATUS AND INTELLIGENT POWER MODULE USING SAME

摘要

An overcurrent detection apparatus includes a sense emitter current detection unit that detects a sense emitter current output from a sense emitter of an IGBT as a sense emitter voltage, and a comparison unit that detects an overcurrent by comparing the sense emitter voltage detected by the sense emitter current detection unit with a threshold voltage. The overcurrent detection apparatus also includes a correction current detection unit that detects a correction current corresponding to a current flowing between a gate and the sense emitter of the IGBT as a corrected voltage; and a voltage correction unit that calculates a sense emitter corrected voltage by subtracting the correction voltage detected by the corrected current detection unit from the sense emitter voltage detected by the sense emitter current detection unit, and supplies the sense emitter corrected voltage to the comparison unit.

主权项

1. An apparatus, comprising.
a sense emitter current detection unit configured to detect a sense emitter current output from a sense emitter of an insulated gate bipolar transistor as a sense emitter voltage; a correction current detection unit configured to detect a correction current corresponding to a current that flows between a gate and the sense emitter of the insulated gate bipolar transistor as a corrected voltage; a voltage correction unit configured to calculate a sense emitter corrected voltage by subtracting the corrected voltage from the sense emitter voltage; and a comparison unit configured to detect an overcurrent by comparing the sense emitter corrected voltage with a reference voltage.