CONTROLLED LIGHT-EMITTING DIODE LIGHT SIGNAL Russian patent published in 2005 - IPC

FIELD: transport engineering; railway traffic control light signals.

SUBSTANCE: proposed controlled light-emitting diode light signal contains N transformers whose primary windings are connected in series aiding and connected to supply source through contact of signal relay and power electrodes of transistor, and each of N secondary windings of transformers is connected through protective diodes with corresponding group of light-emitting diodes consisting of K light-emitting diodes connected in series aiding. Each of K x N light-emitting diodes of groups is optically coupled with each of parallel connected K x N photoresistors. Light signal contains resistor and comparator circuit where first point of connection of parallel-connected photoresistors is connected to point of connection of contact of signal relay and transformer, and second point of connection of parallel-connected photoresistor is connected to first output of resistor and input of comparator circuit. Comparator circuit consists of differential amplifier whose first input is connected with common contact of voltage drop relay, its front and resting contacts are connected to first and second sources of reference voltage, respectively, second input of differential amplifier being input of comparator circuit whose output connected to control input of pulse generator being output of differential amplifier. Second output of resistor is connected with point of connection of one of power electrodes of transistor and supply source. Invention makes it possible to control brightness of light-emitting diodes and stabilize radiation, and it provides possibility of double reduction of voltage and blackout.

EFFECT: provision of reliable control of light signal.

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