LED traffic signal light with automatic low-line voltage compens

Details LED traffic signal light with automatic low-line voltage compens LED traffic signal light with automatic low-line voltage compens

1995-09-22

1997-09-02

Hofsass, Jeffery

Communications: electrical

Traffic control indicator

Plural intersections under common central station control

362800, 340925, 340916, 340931, 340641, G08G 107

Patent

active

056637195

ABSTRACT:
The present invention relates to an LED traffic signal light containing numerous LEDs and a voltage compensation circuit which allows the traffic light to operate over a wide range of input power voltages, while generating sufficient light intensity to control traffic at a highway intersection. The voltage compensation circuit achieves these objectives without substantially increasing the power consumption, overall cost, or failure rate of the LED traffic signal light. In the preferred embodiment, the voltage compensation circuit disables or rearranges a first and then a second set of LEDs in the traffic light, as the input power voltage drops below a first and then a second threshold voltage, so that the remaining LEDs will be driven by an increased current and generate a greater overall light intensity than if all of the LEDs were driven by the decreased current that would result from the decreased input power voltage. Also in the preferred embodiment, the LEDs are mounted on a printed circuit board, in a configuration generally corresponding to the shape of the traffic signal light.

REFERENCES:
patent: 3452347 (1969-06-01), Stimson
patent: 3796951 (1974-03-01), Joseph
patent: 3969672 (1976-07-01), Wallander et al.
patent: 4017847 (1977-04-01), Burford et al.
patent: 4211955 (1980-07-01), Ray
patent: 4298869 (1981-11-01), Okuno
patent: 4329625 (1982-05-01), Nishizawa et al.
patent: 4729076 (1988-03-01), Masami et al.
patent: 4939426 (1990-07-01), Menard et al.
patent: 4954822 (1990-09-01), Borenstein
patent: 4965457 (1990-10-01), Wrobel et al.
patent: 5136287 (1992-08-01), Borenstein
patent: 5160201 (1992-11-01), Wrobel
patent: 5457450 (1995-10-01), Deese et al.
"LED 12" Red Signal & LED Retrofit Kit", Econolite Control Products, Inc., Product Brochure.
I.I. Stanley Co., Inc., Design Drawings for LED Traffic Signal Light.

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