Patent ID: 9062647
Filing Date: 2015-06-23
Classification: F02P,H03K

Abstract:
1. A semiconductor device, comprising: a first series circuit wherein a first semiconductor switching element and a sense resistor are connected in series: a second semiconductor switching element connected in parallel to the first series circuit; a drive signal control circuit, into which a drive signal is input, that outputs a drive control signal controlling the first and second semiconductor switching elements; and a self-interrupting circuit connected to the drive signal control circuit, wherein the self-interrupting circuit outputs a predetermined voltage to the drive signal control circuit at a time of normal operation, and outputs a voltage whose amplitude temporally changes in stages to the drive signal control circuit at a time of abnormal operation, and the drive signal control circuit controls so that the amplitude of the drive control signal decreases when the voltage across the sense resistor is higher than the output voltage of the self-interrupting circuit, and controls so that the amplitude of the drive control signal increases when the voltage across the sense resistor is lower than the output voltage of the self-interrupting circuit.