Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1996-06-27
1997-08-26
Hecker, Stuart N.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
H02M 542
Patent
active
056616457
ABSTRACT:
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).
REFERENCES:
patent: 5321600 (1994-06-01), Fierheller
patent: 5532918 (1996-07-01), Mayrand et al.
patent: 5563781 (1996-10-01), Clauter et al.
patent: 5572416 (1996-11-01), Jacobs et al.
patent: 5587895 (1996-12-01), Harkins
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