Lighting circuit

Details Lighting circuit Lighting circuit

2006-07-25

2006-07-25

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S224000, C362S259000, C362S543000, C363S021120, C363S023000

Reexamination Certificate

active

07081708

ABSTRACT:
A lighting circuit for lighting a vehicular lamp including a plurality of light-emitting diodes, includes: a selection unit for selecting the number of light-emitting diodes to be connected in series in the vehicular lamp based on an instruction from the outside; a switching regulator for applying an output voltage based on a power-supply voltage output by an external DC power supply to the selected number of light-emitting diodes to be connected in series, so as to supply a supply current to the selected number of light-emitting diodes; and an output controlling unit for controlling the output voltage of the switching regulator based on the supply current.

REFERENCES:
patent: 3944854 (1976-03-01), Keller
patent: 4743897 (1988-05-01), Perez
patent: 6304464 (2001-10-01), Jacobs et al.
patent: 6641294 (2003-11-01), Lefebvre
patent: 2001/0033503 (2001-10-01), Hamp et al.
patent: 2001-215913 (2001-08-01), None
ESP@CENET Database—12, Patent No. JP2001215913, Publication Date: Aug. 10, 2001, 1 page.
French Search Report dated Sep. 22, 2004.

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