Patent ID: 9356580
Filing Date: 2016-05-31
CPC Classification: H02M,H03K

Claim Text:
1. An insulated gate semiconductor element drive device, including a plurality of drive circuits which drive a plurality of respective insulated gate semiconductor elements connected in parallel, which drives each of the drive circuits in accordance with a control signal and drives the plurality of insulated gate semiconductor elements in parallel, each of the drives circuits comprising: a constant current circuit which supplies a constant current to the gate of the insulated gate semiconductor element and on-operates the insulated gate semiconductor element; a discharge circuit which grounds the gate of the insulated gate semiconductor element and off-operates the insulated gate semiconductor element; a switch circuit which operates one of the constant current circuit or discharge circuit in accordance with a control signal and turns on or off the insulated gate semiconductor element; a current detection circuit which detects a current flowing through the insulated gate semiconductor element when the insulated gate semiconductor element is turned on; and a current regulation circuit which feeds the current detected by the current detection circuit back to the constant current circuit and controls an output current of the constant current circuit.