TRAFFIC LIGHT COLOUR-EMITTING DEVICE Russian patent published in 2010 - IPC H05B37/02 

FIELD: physics.

SUBSTANCE: traffic light colour-emitting device consists of a group of series connected light-emitting diodes (LED) which is connected in parallel to a group of blocking apparatus. The blocking apparatus consists of a thyristor, two resistors and a capacitor. The cathode of the last LED in the said group is connected to the drain of a first transistor which functions as a current generator, the source and gate of which are connected through a third and a fourth resistor to the common wire of the device. In order to increase reliability of the traffic light, a second blocking apparatus is connected in parallel to each LED. In order to protect optoelectronic elements of the traffic light from voltage surge, the primary winding of the first transformer TV is connected in parallel to the first variable resistor Rv and suppressor VD. The primary winding of the second transformer TV is connected in parallel to the second variable resistor Rv and second suppressor VD.

EFFECT: maintenance of operating capacity of the traffic light in case of simultaneous break-down of a separate LED and the blocking apparatus connected to the LED in parallel, maintaining monitoring of operating capacity of the colour-emitting device when one evaluation channel is not working, possibility of informing a superior control centre on operation of the device in pre-failure mode.

5 cl, 2 dwg