초록 ▼

The LED traffic light electronic controller stabilizes the total output light intensity of the traffic light in order to ensure a constant light intensity of each traffic light color throughout the entire traffic light lifetime. The controller detects the output light intensity of a color, and then

The LED traffic light electronic controller stabilizes the total output light intensity of the traffic light in order to ensure a constant light intensity of each traffic light color throughout the entire traffic light lifetime. The controller detects the output light intensity of a color, and then automatically adjusts the power input for the LEDs in order to increase the light intensity when needed. The controller works in a closed loop cycle in order to perform real-time control of the light intensity output. Thus, at each moment of the traffic light lifetime, the output light intensity is constant and equivalent to a predetermined standard. This insures traffic safety for the entire traffic light lifetime and also make it last longer. The controller also provides a ballast load when off, and is able to provide an open circuit when the LEDs have exhausted their useful lifespan. The intensity is further controlled by detecting ambient light conditions.

대표청구항 ▼

[ What is claimed is:] [1.]1. An LED traffic light panel comprising:an array of LEDs having a similar performance to one another which performance decays over an extended period of operational time;a variable power supply connected to said array of LEDs;an extra LED having also a similar performance

[ What is claimed is:] [1.]1. An LED traffic light panel comprising:an array of LEDs having a similar performance to one another which performance decays over an extended period of operational time;a variable power supply connected to said array of LEDs;an extra LED having also a similar performance to said LEDs of said array;a light detector optically coupled to said extra LED; anda controller circuit for adjusting said variable power supply in response to an output of said light detector, whereby an output light intensity of the traffic light panel is stabilized over the life of said LEDs in order to insure a constant light intensity of each traffic light color throughout the entire traffic light panel lifetime.