Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1997-06-11
2000-11-21
Vu, David H.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315129, 315247, 363 74, H05B 3702
Patent
active
061507717
ABSTRACT:
A circuit for interfacing between a conventional traffic signal's control monitor and a plurality of light emitting diodes (LEDs) replacing an incandescent lamp of the traffic signal is disclosed. The interface circuit includes a current source for driving the LEDs with a regulated power factor corrected current. Compatibility with traditional conflict monitors is achieved through a circuit that short circuits incoming current to indicate full turn off of the signal and opens up to indicate full turn on of the signal, and through an "OFC" circuit which presents an open circuit to the conflict monitor upon failure of the traffic signal LEDs. Quick turn-off of the traffic signal LEDs is accomplished with a switching circuit that reduces current flowing through the LEDs below the range for visible turn-off. To minimize light reduction in case of LED failure, the traffic signal LEDs are arranged in either multiple strings of LEDs connected in parallel though multiple substring connections between groups of LEDs, or in a single string of LEDs with reverse biased zener diodes connected in parallel with groups of LEDs.
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Vu David H.
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