LED chain failure detection

Details LED chain failure detection LED chain failure detection

2011-01-25

2011-01-25

Dole, Timothy J (Department: 2831)

Electricity: measuring and testing

Electric lamp or discharge device

Electric lamp

C315S129000, C315S291000

Reexamination Certificate

active

07876103

ABSTRACT:
The system consists of an LED failure detection circuit to provide protection against individual LED catastrophic failure. When LED clusters are arranged in a series-parallel configuration, it is important to detect individual LED failure in order to avoid uncontrolled luminous intensity reduction and/or light uniformity degradation. The circuit compares the voltage levels on LEDs with similar position but situated in different chains. In normal conditions, the voltage levels are substantially similar to one another. In case of individual or multiple LED failure, open or shortcircuit, the circuit sends a signal to the automatic turn off circuit that initiates the lamp forced turn off sequence.

REFERENCES:
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patent: 6351079 (2002-02-01), Willis
patent: 6667623 (2003-12-01), Bourgault et al.
patent: 6963177 (2005-11-01), Ito et al.
patent: 7262752 (2007-08-01), Weindorf
patent: 7317287 (2008-01-01), Blumel
patent: 7635957 (2009-12-01), Tripathi et al.

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