BACKED-UP LED TRAFFIC LIGHT Russian patent published in 2014 - IPC B61L23/00 

FIELD: physics.

SUBSTANCE: traffic light circuit further includes low potential drop diodes and backup LEDs. Each of N main LEDs of a LED array is further connected in parallel to a circuit which consists of series-connected low potential drop diode and backup LED. In case of breakdown of the junction of any of the main LEDs, current begins to flow through the backup LED and the low potential drop diode, thereby ensuring continuous flow of current through all LEDs of the LED array. Fully functional emission of the traffic light is therefore maintained in case of breakdown of one or more LEDs. The disclosed LED traffic light therefore improves reliability of the LED matrix and increases the distance from a control station to a controlled traffic light.

EFFECT: high reliability of the LED array and longer distance from a control station to a controlled traffic light.

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