A light emitting device includes a series connection unit constituted of N light emitting elements, a light emitting element driving circuit having an output terminal connected to an anode of the series connection unit, N short-circuit switches respectively connected in parallel to the light emitting elements, and a switch control unit arranged to control on and off of the short-circuit switches. A ground fault detection circuit, which detects a ground fault of the light emitting device, includes a reference voltage source arranged to generate a reference voltage, and a comparator arranged to compare the anode voltage of the series connection unit with the reference voltage. The reference voltage has a value smaller than the product of an on-resistance of one of the short-circuit switches and output current of the light emitting element driving circuit.


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    Title :

    GROUND FAULT DETECTION CIRCUIT, ABNORMALITY DETECTION CIRCUIT, LIGHT EMITTING DEVICE, VEHICLE


    Additional title:

    ERDSCHLUSSDETEKTORSCHALTUNG, FEHLERERKENNUNGSSCHALTUNG, LICHTEMITTIERENDE VORRICHTUNG, FAHRZEUG
    CIRCUIT DE DÉTECTION DE DÉFAUT À LA TERRE, CIRCUIT DE DÉTECTION D'ANOMALIE, DISPOSITIF ÉLECTROLUMINESCENT, VÉHICULE


    Contributors:

    Publication date :

    2019-05-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / H05B ELECTRIC HEATING , Elektrische Heizung / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen



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