LAMP UNIT POWER SUPPLY SYSTEM
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United States of America Patent
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app pub date -
Mar 7, 2013
filing date -
Mar 8, 2012
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Abandoned
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Abstract
A power supply system for illuminating an LED lamp unit 5, having a normal mode of operation in which a mains input 4 of a driver 3 of the LED lamp unit is supplied by mains power 1, and an emergency mode of operation, in which the LED lamp unit is supplied by a charge storage device 19, is disclosed. The system includes an emergency mode converter 21 operable to step-up the voltage from the charge storage device and to supply the mains driver input for illuminating the LED lamp unit.
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