LED traffic signal light with automatic low-line voltage compens

Communications: electrical – Traffic control indicator – Plural intersections under common central station control

Patent

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Details

340925, 340916, 340931, 340641, 340642, 340660, 340661, 340662, 340663, 362800, G08G 107

Patent

active

054574501

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.

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"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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