Lighting device
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United States of America Patent
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Jul 7, 2015
Grant Date -
Sep 18, 2014
app pub date -
Mar 28, 2012
filing date -
Mar 31, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
In one embodiment of lighting devices and lighting systems, the lighting device has a connection for connecting to a primary power supply and has a secondary power supply, such as a battery. A measuring circuit is operable to measure an impedance of the primary power supply connection and to determine from the measurement if a main power supply has failed, and if so whether to power light sources using power from the secondary power supply.
First Claim
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International Classification(s)
- H02J:CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR D....
- F21V:FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES....
- H05B:ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE ....
- F21Y:INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21L,....
- F21K:LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- H01R:ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL AS....
- F21S:NON-PORTABLE LIGHTING DEVICES OR SYSTEMS THEREOF
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