Current-regulated light emitting device for vehicle use

Details Current-regulated light emitting device for vehicle use Current-regulated light emitting device for vehicle use

2011-05-31

2011-05-31

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S080000, C315S307000

Reexamination Certificate

active

07952290

ABSTRACT:
A current-regulated light emitting device for vehicle use includes a light emitting unit and a current limiting unit. The current limiting unit includes first and second switches and first and second bias units. The first switch is for making and breaking an electrical circuit between the light emitting unit and an electric power source. The first bias unit is for causing the first switch to conduct so as to activate the light emitting unit when the first bias unit receives a drive voltage from the electric power source. The second bias unit is for causing the second switch to conduct when amount of current flowing through the first switch exceeds a predetermined threshold, thereby turning off the first switch to interrupt current flow through the light emitting unit.

REFERENCES:
patent: 6653789 (2003-11-01), Roller et al.
patent: 6949892 (2005-09-01), Horiuchi et al.
patent: 7345433 (2008-03-01), Bacon et al.

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