Patent ID: 8928291
Filing Date: 2015-01-06
Classification: H02P

Abstract:
1. An electric rotary machine comprising: armature windings having not less than two phase windings; switching sections comprising a bridge circuit, the bridge circuit comprising an upper arm and a lower arm, the lower arm comprising switching elements, each of the switching elements in the lower arm being connected in parallel to a diode, and the switching sections configured to receive and rectify a voltage induced by the armature windings; and a capacitor connected in parallel to an output terminal of the switching sections, wherein the switching sections comprise: a control section configured to control a turn-on operation and a turn-off operation of each of the switching elements; and a load dump protection judgment section configured to executes a load dump protection operation by monitoring an output voltage of the switching sections, instructing the control section to turn on the switching elements in the lower arm at a time when a predetermined delay time has elapsed from when the monitored output voltage of the switching sections exceeds a first threshold voltage, and instructing the control section to turn on the switching elements in the lower arm after the switching elements in the lower arm are turned off during a predetermined time length, when the monitored output voltage of the switching sections becomes less than a second threshold voltage after the monitored output voltage of the switching sections exceeds the first threshold voltage.