Title:
MOTOR DRIVER PROTECTING CIRCUIT
Document Type and Number:
Japanese Patent JP3447161
Kind Code:
B2
Abstract:
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.
Inventors:
Hitoshi Sado
Hiroyo Saito
Hiroyo Saito
Application Number:
JP27060495A
Publication Date:
September 16, 2003
Filing Date:
September 25, 1995
Export Citation:
Assignee:
Zexel Valeo Climate Control Co., Ltd.
International Classes:
B60H1/00; H02H5/10; H02H7/00; H02H7/20; H02H9/02; H02H3/05; H02H11/00; (IPC1-7): H02H7/20; B60H1/00
Domestic Patent References:
| JP3145919A |
Other References:
【文献】米国特許4725912(US,A)
Attorney, Agent or Firm:
Tsutomu Abiko
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