Electricity: measuring and testing – Electric lamp or discharge device – Electric lamp
Reexamination Certificate
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.
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Ammari Mohammed
Mihai Dan
Dole Timothy J
Fay Sharpe LLP
GE Lighting Solutions, LLC
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