If a power supply is provided to a circuit necessary to control a switch for switching a path after wakeup, or if a buckle switch (33) is switched while a microcomputer (31) is asleep, an electrical current necessary for reliable operation of the buckle switch (33) cannot be supplied during sleep, so that the buckle switch will not operate normally. This creates the possibility that wakeup cannot be performed. To permit the electrical current necessary for reliable operation of the buckle switch to be secured if the buckle switch is switched while the microcomputer is asleep, an FET (32) capable of being kept ON or OFF by a power supply (30) acting during sleep, a resistor (35) connected with the FET, and a resistor (40) of large resistance for blocking excessive dark current if the buckle switch is connected are arranged in parallel. The combined resistance of the parallel combination of these elements is used as a pull-up resistance at the input of a control unit (41).


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    Title :

    Seat belt retractor motor driving apparatus


    Additional title:

    Antriebsvorrcihtung für Sicherheitsgurtmotor.
    Appareil de commande de moteur d'un retracteur de ceinture de sécurité.


    Contributors:

    Publication date :

    2016-08-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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