A railway signal lamp and its circuit

Abstract

The present invention belongs to the technical field of railway signal equipment, and particularly relates to a railway signal lamp and its circuit. A railway signal lamp circuit includes an EMC protection circuit; at least one signal lamp circuit, which is connected to the EMC protection circuit, and the signal of the at least one signal lamp circuit is input from the EMC protection circuit; an auxiliary power supply circuit, which is connected to the at least one signal lamp circuit; and a control unit, which is connected to the at least one signal lamp circuit and controls the at least one signal lamp circuit to output a constant current. A railway signal lamp realizes constant current output control through the railway signal lamp circuit, ensuring the luminous intensity and service life of the LED lamp. The railway signal lamp and its circuit provided by the present invention have promoted the popularization and development of LED lamps in railway signal equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of railway signal equipment, and particularly relates to a railway signal lamp and its circuit. Background Art

[0002] Railway signal lamps are important equipment for ensuring the safety of railway operations and indicating the normal operation of locomotives. For a long time, the light sources used in such equipment have been incandescent lamps, which have the disadvantages of low lifespan and high energy consumption, resulting in a large amount of maintenance work and a large inventory of spare parts for railway signal lamps. The existing technologies of disc-shaped LED light sources and point-shaped LED light sources have the following disadvantages: 1. The disc-shaped LED light source does not have a main and auxiliary lamp switching function. When the signal lamp fails, there will be no signal, and it must be replaced immediately; 2. Due to multi-point light emission of the disc-shaped LED light source, a Fresnel lens cannot be used to achieve parallel light, and the light is relatively divergent. The light source itself has color differentiation, and manual on-site color discrimination is required during replacement, and production and management are inconvenient. There is no constant current control function, resulting in unstable light emission intensity of the LED lamp and a short lifespan of the LED lamp; 3. Existing LED lamps have insufficient EMC protection, making them prone to damage under surge voltage and thunderstorm weather conditions.

[0003] Therefore, railway signal management and maintenance institutions are urgently in need of upgrading a light source that is safe, reliable, has a long lifespan, and consumes less energy.

[0004] To solve this problem, the present invention adopts a railway signal lamp and its circuit. Summary of the Invention

[0005] One object of the present invention is to solve at least the above problems and / or defects, and provide at least the advantages described hereinafter.

[0006] Another object of the present invention is to provide a railway signal lamp circuit, which improves the lifespan of the signal lamp, and its energy consumption is only one-fifth of that of an incandescent lamp.

[0007] Yet another object of the present invention is to provide a railway signal lamp, which has a simple device, is easy to operate, has low energy consumption, and a long lifespan.

[0008] To achieve these and other advantages of the present invention, the present invention provides a railway signal lamp circuit, comprising:

[0009] An EMC protection circuit;

[0010] At least one signal lamp circuit, which is connected to the EMC protection circuit, and the signal of the at least one signal lamp circuit is input from the EMC protection circuit;

[0011] An auxiliary power supply circuit, which is connected to the at least one signal lamp circuit;

[0012] A control unit, which is connected to the at least one-way signal lamp circuit and controls the at least one-way signal lamp circuit to output a constant current.

[0013] Preferably, the at least one-way signal lamp circuit includes a triode V0, an inductor L0, a lamp bead D0, a conditioning circuit, and a switching circuit. The first end of the triode V0 is connected to the output end of the EMC protection circuit. The second end of the triode V0 is connected to the input end of the inductor L0. The third end of the triode V0 is connected to one end of the switching circuit. The other end of the switching circuit is connected to the control unit. The output end of the inductor L is respectively connected in series with a resistor R0 and the lamp bead D0. The lamp bead D0 is connected to the input end of the conditioning circuit. The output end of the conditioning circuit is connected to the control unit.

[0014] Preferably, it further includes a zener diode V01, a diode V02, and a diode V03. One end of the zener diode V01 is connected to a resistor R00. The other end of the zener diode V01 is connected to the control unit. The input end of the diode V02 is connected to the output end of the EMC protection circuit. The output end of the diode V02 is connected to the auxiliary power supply circuit. The diode V03 is connected between the triode V0 and the inductor L0.

[0015] Preferably, the conditioning circuit includes resistors R02, R04, R05, R06, and an operational amplifier U0. The output end of the lamp bead D0 is connected to the input ends of the resistors R02 and R04. The output end of the resistor R02 is connected to one input end of the operational amplifier U0. The other input end of the operational amplifier U0 is connected to the input ends of the resistor R05 and the resistor R06. The output end of the operational amplifier U0 is connected to the output end of the resistor R05 and the control unit respectively.

[0016] Preferably, the switching circuit includes a resistor R01, a triode V04, and a resistor R03. One end of the resistor R03 is connected to the control unit. The other end of the resistor R03 is connected to one end of the triode V04. The other end of the triode V04 is connected to one end of the resistor R01. The other end of the resistor R01 is connected to the triode V0.

[0017] Preferably, the at least one-way signal lamp circuit includes a main signal lamp circuit and a secondary signal lamp circuit. The main signal lamp circuit and the secondary signal lamp circuit are both connected to the EMC protection circuit, the auxiliary power supply circuit, and the control unit respectively. The main signal lamp circuit and the secondary signal lamp circuit are dual redundant circuits.

[0018] Preferably, the EMC protection circuit includes a differential-mode surge voltage suppression circuit and a common-mode surge voltage suppression circuit. The differential-mode surge voltage suppression circuit includes varistors RV3, RV4, and RV5. The common-mode surge voltage suppression circuit includes RV1, RV2, RV6, discharge tube VP1, and discharge tube VP2. The varistors RV3, RV4, and RV5 are respectively connected to the main lamp drive IN terminal and the common terminal, the auxiliary lamp drive IN terminal and the common terminal, and the main and auxiliary lamp drive IN terminals. After the varistors RV1 and RV2 are connected to the discharge tube VP1, one end is respectively connected to the main lamp drive IN terminal and diode V7, and the other end is respectively connected to the auxiliary lamp drive IN terminal and diode V8. After the varistor RV6 is connected to the discharge tube VP2, it is connected to the common terminal.

[0019] Preferably, the auxiliary power supply circuit includes resistor R8, capacitor C1, voltage regulator chip 7805, and capacitor C2. The input end of the resistor R8 is connected to the at least one signal lamp circuit. The output end of the resistor R8 is respectively connected to the capacitor C2 and the voltage regulator chip 7805. The capacitor C1 is respectively connected to the voltage regulator chip 7850 and the capacitor C1.

[0020] The present invention also provides a railway signal lamp, including the circuit, PCB board, and housing as described above. The circuit is arranged on the PCB board, and the PCB board is located inside the housing.

[0021] Preferably, the housing is provided with a connector. One end of the connector is connected to the input signal, and the other end of the connector is connected to the circuit.

[0022] The present invention has at least the following beneficial effects:

[0023] 1. For the railway signal lamp circuit provided by the present invention, it adopts main and auxiliary lamp switching. When the signal lamp fails, it can avoid the situation of no signal, improving the safety of railway operation.

[0024] 2. For the railway signal lamp circuit provided by the present invention, it has a constant current control function, making the light emission intensity of the LED lamp stable and extending the service life of the LED lamp.

[0025] 3. For the railway signal lamp circuit provided by the present invention, it adopts an EMC protection circuit, avoiding the damage of surge voltage to the circuit and ensuring the normal operation of the circuit.

[0026] 4. For the railway signal lamp provided by the present invention, it has a simple structure, low cost, market competitiveness, and is convenient for popularization. Description of the Drawings

[0027] Figure 1It is a schematic structural diagram of the railway signal lamp circuit described in the present invention

[0028] Figure 2 It is a circuit schematic diagram of an embodiment of the at least one-way signal lamp circuit;

[0029] Figure 3 It is a circuit schematic diagram of another embodiment of the at least one-way signal lamp circuit;

[0030] Figure 4 It is a schematic diagram of the conditioning circuit;

[0031] Figure 5 It is a circuit schematic diagram of still another embodiment of the at least one-way signal lamp circuit;

[0032] Figure 6 It is a circuit schematic diagram of yet another embodiment of the at least one-way signal lamp circuit;

[0033] Figure 7 It is a schematic diagram of the EMC protection circuit;

[0034] Figure 8 It is a schematic diagram of the auxiliary power supply circuit;

[0035] Figure 9 It is a circuit schematic diagram of an embodiment of the railway signal lamp circuit;

[0036] Figure 10 It is a schematic structural diagram of the railway signal lamp;

[0037] Wherein, 1 - housing, 2 - LED lamp beads, 3 - lamp socket, 4 - connector. Detailed implementation manners

[0038] The following further elaborates on the present invention with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification.

[0039] In this specification, when an element is referred to as "connected to or coupled to" another element or "disposed in another element", it may be "directly" connected to or coupled to the other element or "directly" disposed in the other element, or connected to or coupled to the other element or disposed in the other element with other elements intervening therebetween, unless it is stated as "directly coupled to or connected to" the other element or "directly disposed" in the other element. In addition, it should be understood that when an element is referred to as "on another element", "above another element", "under another element" or "below another element", it may be in "direct" contact with the other element or in contact with the other element with other elements intervening therebetween, unless it is referred to as being in direct contact with the other element.

[0040] The present invention provides a railway signal lamp circuit, as Figure 1 shown, comprising:

[0041] an EMC protection circuit;

[0042] at least one signal lamp circuit, which is connected to the EMC protection circuit, and the signal of the at least one signal lamp circuit is input from the EMC protection circuit;

[0043] an auxiliary power supply circuit, which is connected to the at least one signal lamp circuit;

[0044] a control unit, which is connected to the at least one signal lamp circuit and controls the at least one signal lamp circuit to output a constant current.

[0045] The circuit composed of the above EMC protection circuit, at least one signal lamp circuit, auxiliary power supply circuit, and control unit of the present invention reduces the energy consumption of railway signal lamps, extends the service life of signal lamps, has a higher light efficiency than that of traditional incandescent lamps, accurate chromaticity coordinates, and ensures that the maintenance lamp replacement cycle is increased from the original half year to two years, improving the use efficiency.

[0046] On the basis of the above situation, there is another embodiment, as Figure 2 shown, the at least one signal lamp circuit includes a triode V0, an inductor L0, a lamp bead D0, a conditioning circuit, and a switching circuit. The first end of the triode V0 is connected to the output end of the EMC protection circuit, the second end of the triode V0 is connected to the input end of the inductor L0, the third end of the triode V0 is connected to one end of the switching circuit, the other end of the switching circuit is connected to the control unit, the output end of the inductor L is respectively connected in series with a resistor R0 and the lamp bead D0, the lamp bead D0 is connected to the input end of the conditioning circuit, and the output end of the conditioning circuit is connected to the control unit.

[0047] When a signal lamp signal is input, after the input voltage passes through the EMC protection circuit, it goes from the emitter to the collector of the triode V0, passes through the inductor L0 and the resistor R0 to provide a constant current to the LED lamp bead D0. Among them, when the signal lamp is valid, the conditioning circuit reaches the control unit, and through internal AD sampling and then through the switching circuit, the switching conduction between the emitter and the collector of the triode V0 is carried out in a form with a controllable duty cycle, so that the output current of the signal lamp is constant, ensuring the stability of the luminous intensity and chromaticity coordinates of the LED lamp D0, as well as the consistency of the service life.

[0048] On the basis of the above embodiment, there is another embodiment, as Figure 3As shown, it further includes a voltage stabilizing diode V01, a diode V02, and a diode V03. One end of the voltage stabilizing diode V01 is connected to a resistor R00, the other end of the voltage stabilizing diode V01 is connected to the control unit, the input end of the diode V02 is connected to the output end of the EMC protection circuit, the output end of the diode V02 is connected to the auxiliary power supply circuit, and the diode V03 is connected between the triode V0 and the inductor L0.

[0049] Among them, the voltage of the signal lamp D0 passes through the resistor R00 and the voltage stabilizing diode V01 to provide a valid signal of the signal lamp D0 to the control unit, and the triode V0 is turned on through the control unit to light the signal lamp D0; as Figure 3 the input voltage passes through the diode V02 and then is connected to the resistor R8 in the auxiliary power supply circuit to provide the working voltage VCC for the system; the diode V03 provides a freewheeling circuit for the lamp bead D0;

[0050] Based on the above embodiments, there is another embodiment. As Figure 4 shown, the conditioning circuit includes resistors R02, R04, R05, R06 and an operational amplifier U0. The output end of the lamp bead D0 is connected to the input ends of the resistors R02 and R04. The output end of the resistor R02 is connected to one input end of the operational amplifier U0. The other input end of the operational amplifier U0 is connected to the input ends of the resistor R05 and the resistor R06. The output end of the operational amplifier U0 is connected to the output end of the resistor R05 and the control unit respectively.

[0051] The current of at least one signal lamp circuit is divided by the resistor R02 and passes through a signal lamp current signal conditioning circuit composed of R04, R05, R06 and the operational amplifier U0 to provide a signal lamp current sampling signal to the control unit;

[0052] Based on the above embodiments, there is yet another embodiment. As Figure 5 shown, the switching circuit includes a resistor R01, a triode V04, and a resistor R03. One end of the resistor R03 is connected to the control unit, the other end of the resistor R03 is connected to one end of the triode V04, the other end of the triode V04 is connected to one end of the resistor R01, and the other end of the resistor R01 is connected to the triode V0.

[0053] When the signal of the signal lamp is valid, after the signal lamp current signal reaches the control unit, through internal AD sampling, through resistor R03, the base of triode V04, the collector of triode V04, and resistor R01, the base of triode V0 is controlled, so that the switch between the emitter and the collector of triode V0 conducts in a form with a controllable duty cycle, thereby making the output current of the signal lamp constant, ensuring the stability of the luminous intensity and chromaticity coordinates of the signal lamp, as well as the consistency of the lifespan.

[0054] Based on the above embodiment, in another embodiment, as Figure 6 shown, the at least one-way signal lamp circuit includes a main signal lamp circuit and a secondary signal lamp circuit. Both the main signal lamp circuit and the secondary signal lamp circuit are respectively connected to the EMC protection circuit, the auxiliary power supply circuit, and the control unit. The main signal lamp circuit and the secondary signal lamp circuit are dual redundant circuits.

[0055] Among them, the entire circuit is a dual redundant design, compatible with the main and secondary filaments (lamps) drive circuits of railway signal lamps. For the two-way signal lamp circuit, the main and secondary are in cold standby. When the main lamp fails, the lighting unit controls the switch to the secondary lamp to light up, ensuring the normal use of the signal lamp.

[0056] Based on the above embodiment, in another embodiment, as Figure 7 shown, the EMC protection circuit includes a differential mode surge voltage suppression circuit and a common mode surge voltage suppression circuit. The differential mode surge voltage suppression circuit includes varistors RV3, RV4, RV5. The common mode surge voltage suppression circuit includes RV1, RV2, RV6, discharge tubes VP1, VP2. The varistors RV3, RV4, RV5 are respectively connected to the main lamp drive IN terminal and the common terminal, the secondary lamp drive IN terminal and the common terminal, and the main and secondary lamp drive IN terminals. After the varistors RV1, RV2 are connected to the discharge tube VP1, one end is respectively connected to the main lamp drive IN terminal and diode V7, and the other end is respectively connected to the secondary lamp drive IN terminal and diode V8. After the varistor RV6 is connected to the discharge tube VP2, it is connected to the common terminal.

[0057] Among them, the EMC protection circuit is provided with a main lamp drive - IN terminal, a main lamp drive - OUT, for the input and output of the main lamp signal, a secondary lamp drive - IN terminal, a secondary lamp drive - OUT terminal, for the input and output of the secondary lamp signal, a common terminal - IN, a common terminal - OUT, for connecting the input and output of the common terminal. The main lamp signal passes through the main lamp drive - IN port of the EMC circuit board, diode V7, and the main lamp drive - OUT port of the EMC circuit board, and provides a surge - free signal voltage to the Figure 9 main lamp drive circuit inFigure 9 The auxiliary lamp drive circuit provides a surge-free signal voltage;

[0058] Specifically, varistors RV3, RV4, and RV5 are differential-mode surge voltage suppression components between the main lamp and the common terminal, the auxiliary lamp and the common terminal, and between the main and auxiliary lamps respectively. When a differential-mode surge voltage is input through the main lamp drive IN terminal and the auxiliary lamp drive IN terminal, or through the main lamp drive IN terminal and the common terminal IN terminal, or through the auxiliary lamp drive IN terminal and the common terminal IN terminal, the above components can absorb and suppress it, making the voltage flowing into the drive circuit within the safe operating range of the backend components; varistors RV1, RV2, RV6 and discharge tubes VP1, VP2 form a common-mode surge voltage suppression circuit for the main lamp voltage, auxiliary lamp voltage and common terminal. When a common-mode surge voltage enters the circuit through the main lamp drive IN terminal or the auxiliary lamp drive IN terminal or the common terminal IN, it is introduced to the chassis ground through the above components.

[0059] Based on the above embodiment, there is another embodiment, as Figure 8 shown, the auxiliary power supply circuit includes a resistor R8, a capacitor C1, a voltage regulator chip 7805 and a capacitor C2. The input end of the resistor R8 is connected to the at least one signal lamp circuit, the output end of the resistor R8 is respectively connected to the capacitor C2 and the voltage regulator chip 7805, and the capacitor C1 is respectively connected to the voltage regulator chip 7850 and the capacitor C1.

[0060] Among them, the auxiliary power supply is used to provide the working voltage VCC for the system.

[0061] Based on the above embodiment, there is another embodiment, as Figure 9 shown, the control unit is a chip U3 of the PIC16(L)1574 model. The main signal lamp circuit includes a triode V1, an inductor L1, lamp beads D1, D2, a first conditioning circuit, and a first switching circuit. The first end of the triode V1 is connected to the main lamp input voltage - OUT (i.e., the main lamp drive - OUT terminal) of the EMC protection circuit. The collector of the triode V1 is connected to the input end of the inductor L1. The base of the triode V1 is connected to one end of the switching circuit, and the other end of the switching circuit is connected to the output port RA4 of the chip U3. The output end of the inductor L1 is respectively connected in series with a resistor R14, the lamp bead D1, and the lamp bead D2. The lamp bead D2 is connected to the input end of the conditioning circuit, and the output end of the conditioning circuit is connected to the chip RA0 port;

[0062] Specifically, it further includes a voltage stabilizing diode V6, a diode V2, and a diode V10. One end of the voltage stabilizing diode V6 is connected to a resistor R16, and the other end of the voltage stabilizing diode V6 is connected to the RA3 port of the chip U3. The input end of the diode V2 is connected to the output end of the EMC protection circuit, and the output end of the diode V2 is connected to the resistor R8 in the auxiliary power supply circuit. The diode V10 is connected between the triode V1 and the inductor L1 to provide a freewheeling circuit for the lamp beads D1 and D2.

[0063] Specifically, the first switch circuit includes a resistor R1, a triode V3, and a resistor R3. One end of the resistor R3 is connected to the RA4 end of the chip U3, the other end of the resistor R3 is connected to the base of the triode V3, the collector of the triode V3 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the base of the triode V1. The first switch circuit controls the conduction of the triode V1 switch in a form with a controllable duty cycle to ensure a constant current output of the main lamp, ensure the stability of the light emission intensity and chromaticity coordinates of the main lamp beads, and the consistency of the lifespan.

[0064] Specifically, the first conditioning circuit includes resistors R2, R4, R5, R6, and an operational amplifier U1. The output end of the signal lamp D2 is connected to the input ends of the resistors R2 and R4. The output end of the resistor R2 is connected to one input end of the operational amplifier U1A. The other input end of the operational amplifier U1A is connected to the input ends of the resistor R5 and the resistor R6. The output end of the operational amplifier U1A is respectively connected to the output end of the resistor R5 and the RA0 port of the chip U3. The main lamp current is divided by the resistor R2, and a main lamp current signal conditioning circuit composed of R4, R5, R6, and the operational amplifier U1A provides a main lamp current sampling signal to the RA0 port of the intelligent chip U3.

[0065] Such as Figure 9As shown in the figure, the auxiliary signal lamp circuit includes a triode V5, an inductor L2, lamp beads D3, D4, a second conditioning circuit, and a second switching circuit. The emitter of the triode V5 is connected to the output end of the EMC protection circuit. The collector of the triode V5 is connected to the input end of the inductor L2. The base of the triode V5 is connected to one end of the second switching circuit. The other end of the second switching circuit is connected to the RA5 terminal of the U3 chip. The output end of the inductor L2 is respectively connected in series with a resistor R15, the lamp bead D3, and the lamp bead D4. The lamp bead D4 is connected to the input end of the second conditioning circuit. The output end of the second conditioning circuit is connected to the RA1 terminal of the chip U3; among them, when the auxiliary lamp signal is input, after passing through the EMC protection circuit, the input voltage goes from the emitter to the collector of the triode V5, passes through the inductor L2 and the resistor R15 to provide a constant current to the LED auxiliary lamp beads D3 and D4.

[0066] Specifically, it further includes a zener diode V9, a diode V4, and a diode V11. One end of the zener diode V9 is connected to a resistor R17, and the other end of the zener diode V9 is connected to the RC5 terminal of the chip U3. The input end of the diode V4 is connected to the output end of the EMC protection circuit, and the output end of the diode V4 is connected to the R8 in the auxiliary power supply circuit. The diode V11 is connected between the triode V5 and the inductor L2; the diode V11 provides a freewheeling path for the lamp beads D3 and D4. The auxiliary lamp voltage provides a valid signal of the auxiliary lamp to the RC5 port of the single-chip microcomputer U3 through the resistor R17 and the zener diode V9, and controls the triode V5 to turn on through the RA5 port of U3 to light the D3 and D4 of the auxiliary lamp LED.

[0067] Specifically, the second switching circuit includes a resistor R7, a triode V6, and a resistor R10. One end of the resistor R10 is connected to the RA5 terminal of the chip U3, the other end of the resistor R10 is connected to the base of the triode V6, the collector of the triode V6 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the base of the triode V5.

[0068] Specifically, the second conditioning circuit includes resistors R9, R11, R12, R13, and an operational amplifier U1B. The output end of the signal lamp D4 is connected to the input ends of the resistors R9 and R11. The output end of the resistor R29 is connected to one input end of the operational amplifier U1B. The other input end of the operational amplifier U1B is connected to the input ends of the resistor R12 and the resistor R13. The output end of the operational amplifier U1B is respectively connected to the output end of the resistor R12 and the RA1 of the chip U3.

[0069] Among them, the current of the auxiliary lamp passes through the resistor R9 and forms an auxiliary lamp current signal conditioning circuit through R11, R12, R13 and the operational amplifier U1B, providing an auxiliary lamp current sampling signal to the RA1 port of the intelligent chip U3 single-chip microcomputer. When the auxiliary lamp signal is valid, after the auxiliary lamp current signal reaches the U3 port RA1, U3 performs internal AD sampling, and through the output port RA5, resistor R10, the base and collector of the triode V6, resistor R7, controls the base of the triode V5, so that the switch between the emitter and collector of the triode V5 conducts in a duty-cycle controllable form, making the output current of the auxiliary lamp constant, ensuring the stability of the luminous intensity and chromaticity coordinates of the LED auxiliary lamps D3 and D4, as well as the consistency of the service life.

[0070] Since the auxiliary signal lamp circuit and the main signal lamp circuit are designed with dual-channel redundancy, the principle and signal flow direction of the main signal lamp circuit are the same as those of the auxiliary signal circuit, so no more description will be made.

[0071] The working principle of the present invention is described by taking the Figure 7 and Figure 9 embodiment in

[0072] When the main lamp signal is input, after the input voltage passes through the EMC protection circuit, that is, the main lamp signal passes through the "main lamp drive IN" port of the EMC circuit board, diode V7, the "main lamp drive OUT" port of the EMC circuit board, and provides a surge-free signal voltage to the main lamp drive circuit from the emitter to the collector of the triode V1. At the same time, the current signal provided to the main lamp drive circuit is divided by the resistor R2 and forms a main lamp current signal conditioning circuit through R4, R5, R6 and the operational amplifier U1A, providing a main lamp current sampling signal to the RA0 port of the intelligent chip U3. At the same time, the main lamp voltage passes through the resistor R16 and the zener diode V6 to provide a valid signal of the main lamp to the U3 port RA3 of the single-chip microcomputer. When the main lamp signal is valid, after the main lamp current signal reaches the U3 port RA0, U3 performs internal AD sampling, and through the output port RA4, resistor R3, the base of the triode V3, the collector of V3, resistor R1, controls the base of the triode V1, so that the switch between the emitter and collector of the triode V1 conducts in a duty-cycle controllable form, making the output current of the main lamp constant. The constant current passes through the inductor L1 and resistor R14 to provide a constant current to the LED main lamp beads D1 and D2, lighting the D1 and D2 of the main lamp LED. The diode V10 provides a freewheeling circuit for the lamp beads D1 and D2;

[0073] If the main lamp signal is normal and the auxiliary lamp does not work, when the main lamp signal is abnormal, the auxiliary signal lamp circuit is started: when the auxiliary lamp signal is input, after the input voltage passes through the EMC protection circuit, that is, the auxiliary lamp signal passes through the "Auxiliary Lamp Drive IN" port of the EMC circuit board, diode V8, and the "Auxiliary Lamp Drive OUT" port of the EMC circuit board, to provide a surge-free signal voltage for the auxiliary lamp drive circuit from the emitter to the collector of triode V5. At the same time, the auxiliary lamp current passes through resistor R9 and through the auxiliary lamp current signal conditioning circuit composed of R11, R12, R13 and operational amplifier U1B to provide an auxiliary lamp current sampling signal to the RA1 port of the intelligent chip U3 single-chip microcomputer. At the same time, the auxiliary lamp voltage passes through resistor R17 and zener diode V7 to provide an effective signal of the auxiliary lamp to the RC5 port of the single-chip microcomputer U3. When the auxiliary lamp signal is effective, after the auxiliary lamp current signal reaches the U3 port RA1, U3 performs internal AD sampling, and through the output port RA5, resistor R10, the base of triode V6, the collector, resistor R7, controls the base of triode V5, so that the switch between the emitter and the collector of triode V5 conducts in a duty cycle controllable form, making the output current of the auxiliary lamp constant. The constant current passes through inductor L2 and resistor R15 to provide a constant current for the LED auxiliary lamp beads D3 and D4, lighting the D3 and D4 of the auxiliary lamp LED, and diode V11 provides a freewheeling circuit for the lamp beads D3 and D4.

[0074] The present invention also provides a railway signal lamp, such as Figure 10 shown, including the circuit, PCB board and housing 1 as described above. The circuit is arranged on the PCB board, the PCB board is located inside the housing, the housing is arranged on the lamp socket 3, the housing is provided with a connector 4, one end of the connector is connected to the input signal, and the other end of the connector is connected to the circuit.

[0075] Specifically, the LED lamp beads in the main and auxiliary signal lamps are installed by separate wiring and soldering on an aluminum substrate PCB. The drive circuit is separately installed on an ordinary PCB. The whole device is installed in a cylindrical cast aluminum housing. The cylindrical cast aluminum housing is connected to the input signal through a connector of an engineering plastic base. The cylindrical LED lamp beads 2 emit light outward through the cover lamp holes.

[0076] The railway signal lamp provided by the present invention realizes LED constant current control. By setting a constant current controlled by a switch controlled by a single-chip microcomputer U3, the LED lamp beads are driven, ensuring the luminous intensity of the LED lamp, keeping the chromaticity coordinates constant, and at the same time ensuring that the service life of the LED is controllable. Moreover, for the two-way LED lamps, the main and auxiliary lamps are in cold standby. When the main lamp fails, the lighting unit controls the switch to the auxiliary lamp to light up; and it realizes full-spectrum light emission, and various chromaticity coordinates of various colors can be achieved through a color mirror. The railway signal lamp provided by the present invention fully adapts to outdoor open-air work, completes full EMS protection for the input and output ends, and meets the requirements of TB / T 3242-2010 "General Technical Conditions for LED Railway Signal Mechanisms".

[0077] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. A railway signal lamp circuit, characterized in that, Comprising: EMC protection circuit; At least one signal lamp circuit, which is connected to the EMC protection circuit, and the signal of the at least one signal lamp circuit is input from the EMC protection circuit; Auxiliary power supply circuit, which is connected to the at least one signal lamp circuit; Control unit, which is connected to the at least one signal lamp circuit and controls the at least one signal lamp circuit to output a constant current; Wherein, the at least one signal lamp circuit includes a triode V0, an inductor L0, a lamp bead D0, a conditioning circuit, and a switching circuit. The first end of the triode V0 is connected to the output end of the EMC protection circuit, the second end of the triode V0 is connected to the input end of the inductor L0, the third end of the triode V0 is connected to one end of the switching circuit, the other end of the switching circuit is connected to the control unit, the output end of the inductor L is respectively connected in series with a resistor R0 and the lamp bead D0, the lamp bead D0 is connected to the input end of the conditioning circuit, and the output end of the conditioning circuit is connected to the control unit.

2. The railway signal lamp circuit according to claim 1, wherein It further includes a zener diode V01, a diode V02, and a diode V03. One end of the zener diode V01 is connected to a resistor R00, the other end of the zener diode V01 is connected to the control unit, the input end of the diode V02 is connected to the output end of the EMC protection circuit, the output end of the diode V02 is connected to the auxiliary power supply circuit, and the diode V03 is connected between the triode V0 and the inductor L0.

3. The railway signal lamp circuit according to claim 1, characterized in that, The conditioning circuit includes resistors R02, R04, R05, R06 and an operational amplifier U0. The output end of the lamp bead D0 is connected to the input ends of the resistors R02 and R04, the output end of the resistor R02 is connected to one input end of the operational amplifier U0, the other input end of the operational amplifier U0 is connected to the input ends of the resistor R05 and the resistor R06, and the output end of the operational amplifier U0 is connected to the output end of the resistor R05 and the control unit respectively.

4. The railway signal lamp circuit according to claim 1, wherein, The switching circuit includes a resistor R01, a triode V04, and a resistor R03. One end of the resistor R03 is connected to the control unit, the other end of the resistor R03 is connected to one end of the triode V04, the other end of the triode V04 is connected to one end of the resistor R01, and the other end of the resistor R01 is connected to the triode V0.

5. The railway signal lamp circuit according to claim 1, characterized in that, The at least one signal lamp circuit includes a main signal lamp circuit and a secondary signal lamp circuit. The main signal lamp circuit and the secondary signal lamp circuit are both connected to the EMC protection circuit, the auxiliary power supply circuit, and the control unit respectively, and the main signal lamp circuit and the secondary signal lamp circuit are a dual-channel redundant circuit.

6. The railway signal lamp circuit according to claim 5, wherein, The EMC protection circuit includes a differential-mode surge voltage suppression circuit and a common-mode surge voltage suppression circuit. The differential-mode surge voltage suppression circuit includes varistors RV3, RV4, and RV5. The common-mode surge voltage suppression circuit includes RV1, RV2, RV6, discharge tube VP1, and discharge tube VP2. The varistors RV3, RV4, and RV5 are respectively connected to the main lamp drive IN terminal and the common terminal, the secondary lamp drive IN terminal and the common terminal, and the main and secondary lamp drive IN terminals. After the varistors RV1 and RV2 are connected to the discharge tube VP1, one end is respectively connected to the main lamp drive IN terminal and diode V7, and the other end is respectively connected to the secondary lamp drive IN terminal and diode V8. After the varistor RV6 is connected to the discharge tube VP2, it is connected to the common terminal.

7. The railway signal lamp circuit according to claim 5, wherein, The auxiliary power supply circuit includes resistor R8, capacitor C1, voltage regulator chip 7805, and capacitor C2. The input end of the resistor R8 is connected to the at least one-way signal lamp circuit. The output end of the resistor R8 is respectively connected to the capacitor C2 and the voltage regulator chip 7805. The capacitor C1 is respectively connected to the voltage regulator chip 7850 and the capacitor C1.

8. A railway signal lamp, characterized in that, It includes the railway signal lamp circuit, PCB board, and housing as described in any one of claims 1 to 7. The circuit is arranged on the PCB board, and the PCB board is located inside the housing.

9. The railway signal lamp according to claim 8, wherein, The housing is provided with a connector. One end of the connector is connected to the input signal, and the other end of the connector is connected to the circuit.

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