Monitoring device for the proper operation of lamps particularly in motor vehicles
AssigneeVDO Adolf Schindling AG
InventorWolfgang Stark
Life of this patent
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Abstract
A monitoring device for the orderly functioning of lamps, particularly in motor vehicles, with a circuit control element arranged in the circuit of the lamps, on which control element a control signal occurs during switching-on of the lamps, as well as with circuit components in a signal circuit, the latter being applied with the control signal. In the circuit of each lamp there is arranged a low impedance resistor, and the low impedance resistor is connected with an input of an amplifier circuit arrangement. An indicator device is connected to the output of the amplifier.
Claims12
A lamp burnout indicating circuit, particularly for monitoring at least one lamp constituting a first-mentioned lamp in motor vehicles, with a signal circuit, said at least one lamp being energizable from a circuit voltage, comprising
- a resistor connected in series with the lamp operatively to said circuit voltage, said resistor having a small resistance in comparison with the resistance of said lamp,
- said signal circuit including an indicator lamp,
- at least one differential amplifier means for sensing a voltage at a point between said resistor and said first-mentioned lamp and providing an output signal for said indicator lamp for actuating the latter when a defective condition of said first-mentioned lamp occurs,
- a potentiometer means connected in series between said point and said differential amplifier means for adjusting said differential amplifier means according to characteristics of said first-mentioned lamp, and
- transmission means for operatively applying a voltage drop across said resistor to said signal circuit for signalling a defective condition of said resistor.
Dependencies are inferred from the claim text.