Current fault detection for light emitters

Details Current fault detection for light emitters Current fault detection for light emitters

2007-09-18

2007-09-18

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

Reexamination Certificate

active

11178686

ABSTRACT:
A device includes a light emitter, a current sensing resistance, a current generator, and detection circuitry. The current generator is connected to the light emitter and to the current sensing resistance. During a normal operating mode of the device, the current generator regulates current flow through the light emitter. In a test mode, the current generator regulates current flow through the current sensing resistance. The detection circuitry, during the test mode, detects when current flow through the current sensing resistance is outside an expected range.

REFERENCES:
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patent: 6704183 (2004-03-01), Stafford
patent: 6836157 (2004-12-01), Rader et al.
patent: 2005/0180473 (2005-08-01), Brosnan
patent: 02082499 (1990-03-01), None
Search Report for Patent Application in Great Britian No. 06130660.0 dated Sep. 28, 2006.

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