Lighting control circuit for vehicle lighting equipment

Details Lighting control circuit for vehicle lighting equipment Lighting control circuit for vehicle lighting equipment

2007-09-25

2007-09-25

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S294000, C315S295000, C315S307000

Reexamination Certificate

active

11225730

ABSTRACT:
An LED is connected to a power supply circuit, and a Zener diode is reverse-connected to the LED and then packaged in an LED package. When a load of the power supply circuit is lightened due to disconnection in the LED package, an output voltage of the power supply circuit shows a rising tendency. However, the power supply circuit limits the maximum voltage applied to the LED within a specified range between a forward voltage of the LED and a forward voltage+a Zener voltage of the Zener diode to prevent current flow through the Zener diode. As a result, no current flows through a resistor R1, then an NPN transistor is turned on, and then the LED acting as a disconnection sensing indicator lamp is turned on.

REFERENCES:
patent: 6153980 (2000-11-01), Marshall et al.
patent: 6870325 (2005-03-01), Bushell et al.
patent: 199 29 165 (2000-01-01), None
patent: 198 41 490 (2000-03-01), None
patent: 11-331494 (1999-11-01), None
patent: 2002-25784 (2002-01-01), None
patent: 2004-9826 (2004-01-01), None
patent: 2004-134147 (2004-04-01), None
Patent Abstracts of Japan, Publication No. 11-331494, Publication Date: Nov. 30, 1999, 1 page.
Patent Abstracts of Japan, Publication No. 2002-025784, Publication Date: Jan. 25, 2002, 1 page.
Patent Abstracts of Japan, Publication No. 2004-009826, Publication Date: Jan. 15, 2004, 1 page.
Patent Abstracts of Japan, Publication No. 2004-134147, Publication Date: Apr. 30, 2004, 1 page.
Patent Abstracts of Japan, Publication No. 2000-033729, Publication Date: Feb. 2, 2000, 2 pages.
German Office Action issued for German application No. 10 2005 044 437.7-31 mailed on Dec. 7, 2005 and English translation thereof, 10 pages.

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