Open circuit detection for vehicular lamp

Details Open circuit detection for vehicular lamp Open circuit detection for vehicular lamp

2005-11-08

2005-11-08

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S312000

Reexamination Certificate

active

06963177

ABSTRACT:
A vehicular lamp used for a vehicle includes a semiconductor light emitting element for emitting light, a resistor for current detection for causing a current detection voltage in response to a current flowing through the semiconductor light emitting element, the resistor being coupled in series to the semiconductor light emitting element, a serial diode being coupled in series to the resistor for current detection and the semiconductor light emitting element in a forward direction, and an open circuit detecting unit for detecting an open circuit of the semiconductor light emitting element based on a sum voltage, which is a sum of a forward voltage of the serial diode and the current detection voltage.

REFERENCES:
patent: 6351079 (2002-02-01), Willis
patent: 6498440 (2002-12-01), Stam et al.
patent: 6710555 (2004-03-01), Terada et al.
patent: 2002/0011804 (2002-01-01), Fujimura et al.
patent: 10-217851 (1998-08-01), None
Patent Abstracts of Japan, Publication No. 10-217851 dated Aug. 18, 1998, 1 pg.

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