Patent ID: 8861175

Claim:
A power semiconductor device for an igniter, comprising: a semiconductor switching device causing a current to flow through a primary side of an ignition coil or shutting off the current flowing through the primary side of the ignition coil; an integrated circuit driving and controlling the semiconductor switching device; wherein the integrated circuit includes: a first discharge device discharging charge accumulated on a control terminal of the semiconductor switching device and shutting off the semiconductor switching device so as to generate an ignition plug spark voltage on a secondary side of the ignition coil during a normal operation, and a second discharge device slower discharging the charge accumulated on the control terminal of the semiconductor switching device in comparison with the first discharge device and shutting off the semiconductor switching device so that a voltage on the secondary side of the ignition coil is equal to or lower than the ignition plug spark voltage during an abnormal state; and a control terminal voltage observation circuit monitoring a voltage on the control terminal of the semiconductor switching device and shutting off the semiconductor switching device by the first discharge device when the second discharge device is shutting off the semiconductor switching device and the voltage on the control terminal of the semiconductor switching device becomes a predetermined voltage.