Controlled light-emitting diode light signal

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.

1 dwg

 

The invention relates to a regulatory or warning devices installed along the route of locomotives or trains, namely regulating the movement of trains.

Known traffic lights (Systems of railway automatics and telemechanics: textbook for universities/ Whakaruru, Vlastaras, Geflecht and others; Ed. by Wagrowska. -M.: Transport, 1996. -S. 68, Fig.4.1.), in which the radiating element is used incandescent bulbs. A disadvantage of such devices is low reliability.

Greater reliability have traffic lights, which as emitting elements are LEDs (P VI, Etruscan AU Led for crossings traffic lights// Automation, communication, computer science. 1999. No. 12. -C, Fig.1). A disadvantage of such devices is the low energy efficiency, which is caused by the presence of chains of LEDs active limiting resistors, significant scattering and useless power dissipation. In addition, these devices are no opportunities for accurate alignment of the currents through N parallel connected led groups, each of which consists of K series-connected LEDs.

Also known device, which control the brightness of led radiation carried out is carried out with the help of photoconductive (Malyshkov G.M., Soloviev, I., Sapaev HB OPTRON protection switching amplifier/Coll. E-technology in automation/ edited Whicheva. -M.: Owls. Radio, 1977. - 9. -S, Fig.2).

The closest in technical essence to the proposed technical solution is the led lights, which for the formation of currents flowing through It×N LEDs, used transformers, operating in the mode of the inductive energy storage DC (Led lights. Application No. 2001124300/28 (025738)/ Sergeev BS, Shchigolev S.A., V.V. Nagovitsyn IPC 7 H 05 In 37/00, 61 5/18 L, G 08 G 1/95. Priority from 30.08.2001, the Solution FIPS for a patent for invention dated 09.01.2003 year).

A disadvantage of this device is the lack of control the brightness of led radiation, as well as the inability to stabilize the brightness of the radiation and injection modes dual voltage reduction (LTOs) and blackout (CM).

The aim of the invention is to eliminate these disadvantages.

This goal is achieved by the fact that the device entered the resistor and the comparison circuit consisting of a differential amplifier, relay contact voltage reduction and two reference voltage sources.

The invention consists in that the device entered the resistor and the comparison circuit, where the first connection point in parallel included photoresistors connected to the s to the junction point of contact of the alarm relay and transformer, the second connection point of the parallel coupled photoconductive connected to the first output resistor and the input of the comparison circuit consisting of a differential amplifier, a first input connected to the common contact of the relay to reduce stress, its front and rear contacts connected to the first and second reference voltage sources, respectively, and second input of the differential amplifier is the input of the comparison circuit, the output of which is connected to the control input of the pulse generator, an output of the differential amplifier, and a second output resistor connected to the connection point of one of the power electrodes of the transistor and the power source.

The drawing shows a diagram of an adjustable led lights. The light contains a transistor 1, the power electrodes which through series-connected primary windings 2.1,...2.N transformers 3.1,...3.N and pin 4 alarm relay connected to the positive 5 and negative 6 poles of a power source. The input of the transistor 1 is connected to the output of the pulse generator 7, the control input of which is connected to the output of the comparison circuit 8. Each of the secondary windings 9.1,...9.N transformers 3.1,...3.N through appropriate protective diodes 10.1,...10.N connected according to the group and connected in series To the led is in 11.1,C... Each of these LEDs is optically connected with the respective photoconductive 12.1,...K all N led groups, and all N×photoresistors connected in parallel. The first point is parallel to the photoconductive M×(12.1,...12.N) is connected to the connection point of one of the winding outputs 2.1 transformer 3.1 pin 4 alarm relay. The second point of these parallel coupled photoconductive connected with the first output resistor and to the input of the comparison circuit 8. The comparison circuit comprises a differential amplifier 14, the first input of which is connected to the common contact of the relay undervoltage 15, the front and rear contacts of which are connected with the positive pole of the first 16 and second 17 sources of reference voltages, respectively. The second input of the differential amplifier 14 is input to the comparison circuit 8, the output of which is the output of the differential amplifier 14. The second terminal of the resistor 13 is connected to the negative terminal 6 of the power source.

Adjustable led light operates as follows.

The generator 7 controls the pulsed operation of the transistor 1. When the open state of the transistor 1, the current flowing in the primary windings 2.1,...2.N transformers 3.1,...3.N from the poles 5 and 6 of the power supply, creates in their cores accumulating the magician is itoe field. This effect is shown in the circuit of the windings, the current in the secondary windings 9.1,...9.N missing. After locking transistor polarity of the voltage on the windings is reversed, resulting in open protective diodes 10.1,...10.N. This causes the current through the LEDs 11.1,...K all N led groups and their glow.

The luminance of the radiation of all N×To LEDs is fixed by the photoconductive 12.1,...K, the total number of which in the diagram is N×K. since they are connected in parallel, then change the brightness of led radiation will lead to an integral change in the resultant resistance Rrezparallel coupled photoconductive. The change in the value of Rrezcauses a change in voltage at the input of the comparison circuit 8 in accordance with this second input of the differential amplifier 14. To the first input of the amplifier 14 is fed a certain tension, which, according to state relay voltage (pin 15), will be equal to the voltage of the first 16 or 17 second sources of reference voltages. The voltage level of the output signal of the amplifier 14 depends on the result of comparison of the voltages at its first and second inputs. Since the output signal of the amplifier 14 is the output of the comparison circuit 14, it controls the timing generator 7.

For example, if the for some reason the brightness of the radiation any LEDs 11.1,...K decreased, the resistance of the photoconductive Rrezwill increase. This will cause a decrease in the voltage at the input of the comparison circuit 8 (the second input of the differential amplifier 14). Then the output signal of the comparison circuit 8, the differential amplifier 14), controlling the operation of the generator 7 will increase the duration of the on state of the transistor 1, which will lead to an increase in the pulse amplitude of the collector current by the time of its closing. A large amount of energy accumulated in the inductive devices (transformers 3.1,...3.N), will cause an increase in brightness of the LEDs, which will lead to the restoration of the former intensity of the glow. If you increase the brightness of the radiation of the LEDs in the device, the reverse processes take place.

Thus, the proposed device is an automatic control system, which stabilizes the brightness of led radiation.

The desired brightness of light can be installed or a change in the resistance of the resistor 13, or the changing rate of the voltage of one of the reference voltage sources 16 and 17.

The modes of the LTO or SEE implemented by the switching contact 15 of the relay voltage reduction. However as any of the States of these contacts is open, the automatic control system, the control of the brightness of the radiation will be performed. The EU is and you want to have three levels of brightness radiation of light (for example, at different levels of brightness of the radiation modes of the LTO and CM), the comparison circuit may be entered a third reference voltage source, switching the corresponding relay contacts voltage reduction.

Therefore, the proposed technical solution makes it possible to control the brightness of the rays of light, are the required conditions operational stability of brightness, and also implements the receive modes of the LTO and CM with the same parameters the stability of the brightness of the light. It extends the functionality of the applications of led lights.

Adjustable led street lights containing N transformers, the primary windings are connected in accordance with and consistently and is connected through the contact of the alarm relay and the power electrodes of the transistor to a power source, and each of the N secondary windings of the transformers through the protective diode is connected with its corresponding group of LEDs consisting of according To and of series-connected LEDs, each of The·N led groups optically associated with each of the parallel connected To·N photoresistors, characterized in that it introduced the resistor and the comparison circuit, where the first connection point in parallel included photoresistors connected to the point of connection to the contact, the alarm relay and transformer, the second connection point of the parallel coupled photoconductive connected to the first output resistor and the input of the comparison circuit consisting of a differential amplifier, a first input connected to the common contact of the relay to reduce stress, its front and rear contacts connected to the first and second reference voltage sources, respectively, and second input of the differential amplifier is the input of the comparison circuit, the output of which is connected to the control input of the pulse generator, an output of the differential amplifier, and a second output resistor connected to the connection point of one of the power electrodes of the transistor and the power source.



 

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