05661645 is referenced by 341 patents and cites 5 patents.

An apparatus (10) for supplying regulated voltage d.c. electrical power to an LED array (12) includes a rectifier (32) responsive to a.c. power for generating rectified d.c. power and a power factor correcting and voltage regulating buck/boost switchmode converter (38) responsive to the rectified d.c. power for generating regulated voltage d.c. power to illuminate the LED array (12). A battery backup system (62) receives the a.c. power applied to the rectifier (32) for charging a rechargeable battery (66) and sensing an a.c. power failure. A switch-over relay (82) is connected between the battery backup system (62) and the rectifier. Upon sensing a failure of the a.c. power, the battery backup system (62) controls the switch-over relay (82) to connect the battery backup system (62) to the rectifier (32) to provide d.c. power to the switchmode converter (38) to illuminate the LED array (12). A half wave power detector (88) causes the apparatus (10) to reduce regulated d.c. power to dim the LED array (12).

Title
Power supply for light emitting diode array
Application Number
8/673200
Publication Number
5661645
Application Date
June 27, 1996
Publication Date
August 26, 1997
Inventor
Peter A Hochstein
2966 River Valley Dr., Troy, 48098
MI, US
Agent
Howard & Howard
IPC
H02M 5/42
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