| 摘要 |
PROBLEM TO BE SOLVED: To surely perform grounding of a stabilized power circuit, while preventing an overcurrent due to a short-circuit accident to a motor driver provided in an air conditioner for a vehicle. SOLUTION: A ground terminal 4a of a motor driver 4 controlling driving of an actuator motor 3 is connected to a ground terminal 1a of a control unit 1 by an earth wire 11, so as to be earthed to an earth connection point in the outside. On the other hand, the earth of a stabilized power circuit 15 is connected to the outside earth connection point of the control unit 1 by connecting an earth wire 25 to the earth wire 11, and a disconnection avoiding diode 20 is provided between the earth wire 25 and the power transistor unit 10, so that its cathode turns to the side of a power transistor unit 10, even when the control unit 1 is disconnected from the earth connection point, the earth of the stabilized power circuit 15 is ensured. |
