| 摘要 |
PROBLEM TO BE SOLVED: To provide an igniting semiconductor device capable of precisely preventing the burning of an IGBT or an ignition coil, and erroneous ignition, even when reducing the size of a capacitor that produces a time constant of a self-interrupting circuit.SOLUTION: A semiconductor device 5 comprises an IGBTTr2 and a current control circuit 6. The current control circuit 6 comprises a first series circuit in which an IGBTTr1 and a sense resistor R1 are connected in series, a drive signal control circuit 2 and a self-interrupting circuit 3. At a time of an abnormal operation, the self-interrupting circuit 3 outputs a voltage whose amplitude drops temporally in stages toward 0V to the drive signal control circuit 2. The drive signal control circuit 2 controls the amplitude of a drive control signal so that a voltage across sense resistor R1 both ends may be equal to the output voltage of the self-interrupting circuit 3. |
