Lighting circuit

Details Lighting circuit Lighting circuit

2005-01-25

2005-01-25

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S080000

Reexamination Certificate

active

06847169

ABSTRACT:
A lighting circuit for lighting a vehicular lamp including a light-emitting diode, includes: a switching regulator for applying an output voltage based on a power-supply voltage received from a DC power supply provided in the outside thereof to the light-emitting diode so as to supply a supply current to the light-emitting diode; an abnormal state detector for detecting an abnormal state of the lighting circuit based on at least one of the output voltage of the switching regulator, the supply current and the power-supply voltage; and an output controlling unit for controlling the output voltage of the switching regulator based on the supply current or the output voltage of the switching regulator and lowering the output voltage of the switching regulator in a case where the abnormal state detector detected the abnormal state.

REFERENCES:
patent: 6191541 (2001-02-01), Patel et al.
patent: 6286976 (2001-09-01), Chopra et al.
patent: 6653789 (2003-11-01), Roller et al.
patent: 2001-215913 (2001-08-01), None
ESP@CENET Database 12, Japanese Patent No. JP2001215913, Publication date: Aug. 10, 2001, 1 page.

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