Railway signal lamp state monitoring system

Abstract

The utility model relates to a railway signal lamp state monitoring system, which belongs to the technical field of railway monitoring equipment and comprises a state monitoring extension set configured for each railway signal lamp unit, and the state monitoring extension set comprises a filament monitoring unit, a main control unit, an alarm unit, a CAN communication unit, a dial-up unit and a power supply unit for supplying power to the whole system. The first end of the filament monitoring unit is connected to main and auxiliary filaments of the railway signal lamp, the second end of the filament monitoring unit is connected to the input end of the main control unit, and the output end of the main control unit is connected to the alarm unit; an independent state monitoring extension set is configured for each railway signal lamp unit, and particularly, a filament monitoring unit is introduced to be directly connected to a main filament and an auxiliary filament of the signal lamp, so that real-time and accurate monitoring of the filament state is realized. By means of the design, misjudgment caused by cable leakage current is effectively eliminated, and the monitoring accuracy of the state of the signal lamp is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway monitoring equipment, and particularly relates to a railway signal lamp state monitoring system. Background Technique

[0002] With the rapid development of railways, the operating speeds of bullet trains and high-speed trains are constantly increasing, which poses unprecedentedly strict requirements for train operation safety. In the railway signal system, the accuracy and real-time performance of ground signal display are directly related to the operation safety and efficiency of trains. At present, the opening conditions of station signals generally adopt the existing conditions of microcomputer interlocking. The basic circuit for signal lamp lighting is supplied by the indoor signal power supply through the filament relay, remote isolation transformer, and signal cable. However, due to the existence of the capacitance between cable lines, a certain leakage current will be generated between the two return lines of signal lighting, and this current increases significantly with the increase of cable length.

[0003] In practical applications, when the cable length exceeds 10 kilometers, the leakage current often exceeds 40 mA, which is higher than the dropout value of the indoor filament relay (for example, the dropout value of JZXC-H18 is 40 mA). This technical bottleneck causes that in the case of double-filament breakage of the signal lamp bulb, due to the existence of the leakage current, the filament relay cannot drop reliably, thus leading to serious problems: the outdoor signal lamp has actually gone out, but the indoor system still wrongly displays the signal open state. This inconsistent state will not only cause errors in train operation dispatching but also may trigger serious safety accidents such as train collisions, posing a huge threat to the safety and stability of railway transportation.

[0004] To solve the above problems and improve the accuracy and real-time performance of railway signal lamp state monitoring, there is an urgent need for a device that can monitor the state of railway signal lamps in real time and accurately and issue an alarm in case of abnormalities. Content of the Utility Model

[0005] The purpose of the utility model is to provide a railway signal lamp state monitoring system in design to solve the problems existing in the prior art in view of the defects existing in the prior art.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A railway signal lamp state monitoring system includes a state monitoring sub-machine configured for each railway signal lamp unit. The state monitoring sub-machine includes a filament monitoring unit, a main control unit, an alarm unit, a CAN communication unit, a DIP switch unit, and a power supply unit for supplying power to the whole system. The first end of the filament monitoring unit is connected to the main and auxiliary filaments of the railway signal lamp, the second end of the filament monitoring unit is connected to the input end of the main control unit, the output end of the main control unit is connected to the alarm unit, the DIP switch unit is connected to the main control unit, and the main control unit is connected to the remote state monitoring host through the CAN communication unit.

[0008] A further improvement of this technical solution is that the power supply unit includes a power supply communication interface P1, a fuse FU1, a rectifier U1, a capacitor C1, a resistor R1, a voltage regulator chip U2, a resistor R2, a capacitor C2, a capacitor C3, a resistor R3, an inductor L1, a zener diode D1, a capacitor C4, a resistor R4, and a resistor R5;

[0009] The first end of the rectifier U1 is connected to the first power supply pin of the power supply communication interface P1, the second end of the rectifier U1 is connected to the second power supply pin of the power supply communication interface P1 through the fuse FU1, the third end of the rectifier U1 is connected to the 12V power supply output terminal, the first end of the capacitor C1, the first end of the resistor R1, and the first pin of the voltage regulator chip U2, the second end of the capacitor C1 is grounded, the second end of the resistor R1 is connected to the second pin of the voltage regulator chip U2, the third pin of the voltage regulator chip U2 is connected to the first end of the resistor R2, the second end of the resistor R2 and the fourth end of the rectifier U1 are both grounded, the fourth pin of the voltage regulator chip U2 is connected to the fifth pin of the voltage regulator chip U2 through the capacitor C2, the sixth pin of the voltage regulator chip U2 is grounded through the series-connected capacitor C3 and resistor R3, the fifth pin of the voltage regulator chip U2 is connected to the first end of the inductor L1 and the negative electrode of the zener diode D1, the second end of the inductor L1 is connected to the first end of the capacitor C4, the first end of the resistor R4, and the 3.3V power supply output terminal, the second end of the capacitor C4 and the positive electrode of the zener diode D1 are both grounded, the second end of the resistor R4 is connected to the seventh pin of the voltage regulator chip U2, and the seventh pin of the voltage regulator chip U2 is grounded through the resistor R5.

[0010] A further improvement of this technical solution is that the voltage regulator chip U2 uses a voltage regulator chip of model MP1584DN.

[0011] A further improvement of this technical solution is that the main control unit includes a main control chip U3 and a peripheral circuit connected to the main control chip U3; the main control chip U3 uses a single-chip microcomputer of model STM32F103C8T6.

[0012] A further improvement of this technical solution is that the filament monitoring unit includes a main filament monitoring circuit and a secondary filament monitoring circuit;

[0013] The main filament monitoring circuit includes capacitor C5, zener diode D2, resistor R6, optocoupler isolation chip U4, resistor R7, capacitor C6, resistor R8 and capacitor C7. The first end of capacitor C5, the negative electrode of zener diode D2 and the first end of resistor R6 are all connected to the first end of the main filament. The first end of the main filament is connected to the first power supply pin of power supply communication interface P1. The second end of resistor R6, the first end of resistor R7 and the first end of capacitor C6 are all connected to the positive electrode of the light-emitting end of optocoupler isolation chip U4. The negative electrode of the light-emitting end of optocoupler isolation chip U4, the second end of capacitor C6, the second end of resistor R7, the positive electrode of zener diode D2, the second end of capacitor C5 and the second end of the main filament are all connected to the second power supply pin of power supply communication interface P1. The collector of the light-receiving end of optocoupler isolation chip U4 is connected to the first end of resistor R8, the first pin of main control chip U3 and the first end of capacitor C7. The second end of resistor R8 is connected to the 3.3V power supply output terminal. The second end of capacitor C7 and the emitter of the light-receiving end of optocoupler isolation chip U4 are both grounded;

[0014] The auxiliary filament monitoring circuit includes capacitor C8, zener diode D3, resistor R9, optocoupler isolation chip U5, resistor R10, capacitor C9, resistor R11 and capacitor C10. The first end of capacitor C8, the negative electrode of zener diode D3 and the first end of resistor R9 are all connected to the first end of the auxiliary filament. The first end of the auxiliary filament is connected to the second power supply pin of power supply communication interface P1. The second end of resistor R9, the first end of resistor R10 and the first end of capacitor C9 are all connected to the positive electrode of the light-emitting end of optocoupler isolation chip U5. The negative electrode of the light-emitting end of optocoupler isolation chip U5, the second end of capacitor C9, the second end of resistor R10, the positive electrode of zener diode D3, the second end of capacitor C8 and the second end of the auxiliary filament are all connected to the third power supply pin of power supply communication interface P1. The collector of the light-receiving end of optocoupler isolation chip U5 is connected to the first end of resistor R11, the second pin of main control chip U3 and the first end of capacitor C10. The second end of resistor R11 is connected to the 3.3V power supply output terminal. The second end of capacitor C10 and the emitter of the light-receiving end of optocoupler isolation chip U5 are both grounded.

[0015] A further improvement of this technical solution is that both optocoupler isolation chip U4 and optocoupler isolation chip U5 adopt optocoupler isolation chips of model TLP521-1.

[0016] A further improvement of this technical solution is that the alarm unit includes resistor R12, triode Q1, resistor R13 and alarm lamp LED1. The first end of resistor R12 is connected to the third pin of main control chip U3. The second end of resistor R12 is connected to the base of triode Q1. The emitter of triode Q1 is connected to the 3.3V power supply output terminal. The collector of triode Q1 is connected to the positive electrode of alarm lamp LED1 through resistor R13. The negative electrode of alarm lamp LED1 is grounded.

[0017] A further improvement of this technical solution is that the DIP switch unit includes an 8-bit DIP switch S1 of model SW DIP-8, and the DIP switch S1 is connected to the fourth to eleventh pins of the main control chip U3.

[0018] A further improvement of this technical solution is that the CAN communication unit includes a CAN bus transceiver chip U6, a capacitor C11, a resistor R14, a resistor R15, a resistor R16, a resistor R17, and an electrostatic protection diode U7;

[0019] The first pin of the CAN bus transceiver chip U6 is connected to the 3.3V power output terminal and the first end of the capacitor C11. The second end of the capacitor C11 is grounded. The second pin of the CAN bus transceiver chip U6 is connected to the twelfth pin of the main control chip U3. The third pin of the CAN bus transceiver chip U6 is connected to the thirteenth pin of the main control chip U3. The fourth pin of the CAN bus transceiver chip U6 is grounded through the resistor R14. The fifth pin of the CAN bus transceiver chip U6 is connected to the first end of the resistor R15. The sixth pin of the CAN bus transceiver chip U6 is connected to the first end of the resistor R16. The second end of the resistor R15 is connected to the first end of the electrostatic protection diode U7, the first end of the resistor R17, and the first communication pin of the communication interface P1. The second end of the resistor R16 is connected to the second end of the electrostatic protection diode U7, the second end of the resistor R17, and the second communication pin of the communication interface P1. The third end of the electrostatic protection diode U7 is grounded.

[0020] A further improvement of this technical solution is that the CAN bus transceiver chip U6 uses a CAN bus transceiver chip of model SN65HVD230.

[0021] The beneficial effects of this utility model are as follows:

[0022] Improve monitoring accuracy: By configuring an independent status monitoring extension for each railway signal lamp unit, especially introducing a filament monitoring unit directly connected to the main and auxiliary filaments of the signal lamp, real-time and accurate monitoring of the filament status is achieved. This design effectively eliminates misjudgment caused by cable leakage current and ensures the accuracy of signal lamp status monitoring.

[0023] Enhance real-time performance: The system adopts a fast-response main control unit and an efficient CAN communication unit to ensure that once an abnormal signal lamp status (such as filament breakage) is detected, an alarm signal can be immediately transmitted to the remote status monitoring host. This instant communication mechanism greatly shortens the time from fault discovery to response and provides a strong guarantee for taking timely safety measures.

[0024] Enhanced Safety: The system can accurately identify and report the true status of signal lights, avoiding train operation scheduling errors and potential safety accidents caused by inconsistent indoor and outdoor signals. Especially in the case of double-filament breakage of signal lamp bulbs, through reliable monitoring and timely alarms, it effectively prevents trains from running under incorrect signal guidance, thus significantly enhancing the safety and stability of railway transportation.

[0025] In addition, the design principle of this utility model is reliable, and the structure is simple, having a very broad application prospect.

[0026] It can be seen that compared with the prior art, this utility model has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious. Brief Description of the Drawings

[0027] Figure 1 It is a schematic block diagram of the monitoring system.

[0028] Figure 2 It is the circuit schematic diagram of the power supply unit.

[0029] Figure 3 It is the circuit schematic diagram of the main control unit.

[0030] Figure 4 It is the circuit schematic diagram of the filament monitoring unit.

[0031] Figure 5 It is the circuit schematic diagram of the alarm unit.

[0032] Figure 6 It is the circuit schematic diagram of the DIP switch unit.

[0033] Figure 7 It is the circuit schematic diagram of the CAN communication unit.

[0034] 100 is the status monitoring extension unit, 110 is the filament monitoring unit, 120 is the main control unit, 130 is the alarm unit, 140 is the CAN communication unit, 150 is the DIP switch unit, 160 is the power supply unit, and 200 is the remote status monitoring host. Detailed Implementation Manner

[0035] In order to enable those skilled in the art to better understand the technical solutions in this utility model, the following will clearly and completely describe the technical solutions in the embodiments of this utility model in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments. Based on the embodiments in this utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this utility model.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model herein are for the purpose of describing specific embodiments only and are not intended to limit this utility model.

[0037] As Figure 1 shown, this utility model provides a railway signal lamp status monitoring system, which includes a status monitoring sub-machine configured for each railway signal lamp unit. The status monitoring sub-machine includes a filament monitoring unit, a main control unit, an alarm unit, a CAN communication unit, a DIP switch unit, and a power supply unit for powering the entire system. The first end of the filament monitoring unit is connected to the main and auxiliary filaments of the railway signal lamp, the second end of the filament monitoring unit is connected to the input end of the main control unit, the output end of the main control unit is connected to the alarm unit, the DIP switch unit is connected to the main control unit, and the main control unit is connected to a remote status monitoring host through the CAN communication unit.

[0038] As Figure 2 shown, the power supply unit includes a power supply communication interface P1, a fuse FU1, a rectifier U1, a capacitor C1, a resistor R1, a voltage regulator chip U2, a resistor R2, a capacitor C2, a capacitor C3, a resistor R3, an inductor L1, a zener diode D1, a capacitor C4, a resistor R4, and a resistor R5; the first end of the rectifier U1 is connected to the first power supply pin of the power supply communication interface P1, the second end of the rectifier U1 is connected to the second power supply pin of the power supply communication interface P1 through the fuse FU1, the third end of the rectifier U1 is connected to the 12V power output end, the first end of the capacitor C1, the first end of the resistor R1, and the first pin of the voltage regulator chip U2, the second end of the capacitor C1 is grounded, the second end of the resistor R1 is connected to the second pin of the voltage regulator chip U2, the third pin of the voltage regulator chip U2 is connected to the first end of the resistor R2, the second ends of the resistor R2 and the rectifier U1 are both grounded, the fourth pin of the voltage regulator chip U2 is connected to the fifth pin of the voltage regulator chip U2 through the capacitor C2, the sixth pin of the voltage regulator chip U2 is grounded through the series-connected capacitor C3 and resistor R3, the fifth pin of the voltage regulator chip U2 is connected to the first end of the inductor L1 and the cathode of the zener diode D1, the second end of the inductor L1 is connected to the first end of the capacitor C4, the first end of the resistor R4, and the 3.3V power output end, the second ends of the capacitor C4 and the anode of the zener diode D1 are both grounded, the second end of the resistor R4 is connected to the seventh pin of the voltage regulator chip U2, and the seventh pin of the voltage regulator chip U2 is grounded through the resistor R5. Among them, the voltage regulator chip U2 uses a voltage regulator chip with the model MP1584DN.

[0039] As Figure 3As shown, the main control unit includes a main control chip U3 and a peripheral circuit connected to the main control chip U3; the main control chip U3 uses a single-chip microcomputer of model STM32F103C8T6. The peripheral circuit includes a register chip U8 and a debugging interface P2, and the register chip U8 uses a register chip of model DS1302Z.

[0040] As Figure 4 shown, the filament monitoring unit includes a main filament monitoring circuit and a secondary filament monitoring circuit; the main filament monitoring circuit includes a capacitor C5, a zener diode D2, a resistor R6, an opto-isolation chip U4, a resistor R7, a capacitor C6, a resistor R8, and a capacitor C7. The first end of the capacitor C5, the negative electrode of the zener diode D2, and the first end of the resistor R6 are all connected to the first end of the main filament. The first end of the main filament is connected to the first power supply pin of the power supply communication interface P1. The second end of the resistor R6, the first end of the resistor R7, and the first end of the capacitor C6 are all connected to the positive electrode of the light-emitting end of the opto-isolation chip U4. The negative electrode of the light-emitting end of the opto-isolation chip U4, the second end of the capacitor C6, the second end of the resistor R7, the positive electrode of the zener diode D2, the second end of the capacitor C5, and the second end of the main filament are all connected to the second power supply pin of the power supply communication interface P1. The collector of the light-receiving end of the opto-isolation chip U4 is connected to the first end of the resistor R8, the first pin of the main control chip U3, and the first end of the capacitor C7. The second end of the resistor R8 is connected to the 3.3V power supply output terminal, and the second end of the capacitor C7 and the emitter of the light-receiving end of the opto-isolation chip U4 are both grounded.

[0041] The secondary filament monitoring circuit includes a capacitor C8, a zener diode D3, a resistor R9, an opto-isolation chip U5, a resistor R10, a capacitor C9, a resistor R11, and a capacitor C10. The first end of the capacitor C8, the negative electrode of the zener diode D3, and the first end of the resistor R9 are all connected to the first end of the secondary filament. The first end of the secondary filament is connected to the second power supply pin of the power supply communication interface P1. The second end of the resistor R9, the first end of the resistor R10, and the first end of the capacitor C9 are all connected to the positive electrode of the light-emitting end of the opto-isolation chip U5. The negative electrode of the light-emitting end of the opto-isolation chip U5, the second end of the capacitor C9, the second end of the resistor R10, the positive electrode of the zener diode D3, the second end of the capacitor C8, and the second end of the secondary filament are all connected to the third power supply pin of the power supply communication interface P1. The collector of the light-receiving end of the opto-isolation chip U5 is connected to the first end of the resistor R11, the second pin of the main control chip U3, and the first end of the capacitor C10. The second end of the resistor R11 is connected to the 3.3V power supply output terminal, and the second end of the capacitor C10 and the emitter of the light-receiving end of the opto-isolation chip U5 are both grounded.

[0042] Among them, both the opto-isolation chip U4 and the opto-isolation chip U5 use opto-isolation chips of model TLP521-1.

[0043] As Figure 5As shown in the figure, the alarm unit includes a resistor R12, a triode Q1, a resistor R13, and an alarm lamp LED1. The first end of the resistor R12 is connected to the third pin of the main control chip U3, the second end of the resistor R12 is connected to the base of the triode Q1, the emitter of the triode Q1 is connected to the 3.3V power supply output terminal, the collector of the triode Q1 is connected to the positive pole of the alarm lamp LED1 through the resistor R13, and the negative pole of the alarm lamp LED1 is grounded.

[0044] As Figure 6 shown in the figure, the DIP switch unit includes an 8-bit DIP switch S1 of the model SW DIP-8. The DIP switch S1 is connected to the fourth to eleventh pins of the main control chip U3. The first seven DIP switches of the DIP switch S1 are used to determine the substation address: 0 to 127 (only 0 to 100 are actually used), and the eighth DIP switch is used to set the terminal resistance. By using the DIP switch S1, a unique address code is assigned to the status monitoring extension corresponding to each railway signal lamp unit.

[0045] As Figure 7 shown in the figure, the CAN communication unit includes a CAN bus transceiver chip U6, a capacitor C11, resistors R14, R15, R16, R17, and an electrostatic protection diode U7. The first pin of the CAN bus transceiver chip U6 is connected to the 3.3V power supply output terminal and the first end of the capacitor C11, the second end of the capacitor C11 is grounded, the second pin of the CAN bus transceiver chip U6 is connected to the twelfth pin of the main control chip U3, the third pin of the CAN bus transceiver chip U6 is connected to the thirteenth pin of the main control chip U3, the fourth pin of the CAN bus transceiver chip U6 is grounded through the resistor R14, the fifth pin of the CAN bus transceiver chip U6 is connected to the first end of the resistor R15, the sixth pin of the CAN bus transceiver chip U6 is connected to the first end of the resistor R16, the second end of the resistor R15 is connected to the first end of the electrostatic protection diode U7, the first end of the resistor R17, and the first communication pin of the communication interface P1, the second end of the resistor R16 is connected to the second end of the electrostatic protection diode U7, the second end of the resistor R17, and the second communication pin of the communication interface P1, and the third end of the electrostatic protection diode U7 is grounded. Among them, the CAN bus transceiver chip U6 uses a CAN bus transceiver chip of the model SN65HVD230, and the electrostatic protection diode U7 uses an electrostatic protection diode of the model PSM712.

[0046] The above-disclosed is only the preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by those skilled in the art, as well as several improvements and refinements made without departing from the principle of the present invention, should fall within the protection scope of the present invention.

Claims

1. A railway signal light status monitoring system, characterized in that, It includes a status monitoring extension configured for each railway signal lamp unit. The status monitoring extension includes a filament monitoring unit, a main control unit, an alarm unit, a CAN communication unit, a DIP switch unit, and a power supply unit for powering the entire system. The first end of the filament monitoring unit is connected to the main and auxiliary filaments of the railway signal lamp, the second end of the filament monitoring unit is connected to the input end of the main control unit, the output end of the main control unit is connected to the alarm unit, the DIP switch unit is connected to the main control unit, and the main control unit is connected to a remote status monitoring host through the CAN communication unit.

2. The railway signal light status monitoring system according to claim 1, wherein The power supply unit includes a power communication interface P1, a fuse FU1, a rectifier U1, a capacitor C1, a resistor R1, a voltage regulator chip U2, a resistor R2, a capacitor C2, a capacitor C3, a resistor R3, an inductor L1, a zener diode D1, a capacitor C4, a resistor R4, and a resistor R5; The first end of the rectifier U1 is connected to the first power pin of the power communication interface P1, the second end of the rectifier U1 is connected to the second power pin of the power communication interface P1 through the fuse FU1, the third end of the rectifier U1 is connected to the 12V power output terminal, the first end of the capacitor C1, the first end of the resistor R1, and the first pin of the voltage regulator chip U2. The second end of the capacitor C1 is grounded, the second end of the resistor R1 is connected to the second pin of the voltage regulator chip U2, the third pin of the voltage regulator chip U2 is connected to the first end of the resistor R2, and the second ends of the resistor R2 and the fourth end of the rectifier U1 are both grounded. The fourth pin of the voltage regulator chip U2 is connected to the fifth pin of the voltage regulator chip U2 through the capacitor C2. The sixth pin of the voltage regulator chip U2 is grounded through the series-connected capacitor C3 and resistor R3. The fifth pin of the voltage regulator chip U2 is connected to the first end of the inductor L1 and the cathode of the zener diode D1. The second end of the inductor L1 is connected to the first end of the capacitor C4, the first end of the resistor R4, and the 3.3V power output terminal. The second ends of the capacitor C4 and the anode of the zener diode D1 are both grounded. The second end of the resistor R4 is connected to the seventh pin of the voltage regulator chip U2, and the seventh pin of the voltage regulator chip U2 is grounded through the resistor R5.

3. The railway signal light status monitoring system according to claim 2, wherein The voltage regulator chip U2 uses a voltage regulator chip with the model number MP1584DN.

4. The railway signal lamp status monitoring system according to claim 2, wherein The main control unit includes a main control chip U3 and a peripheral circuit connected to the main control chip U3; the main control chip U3 uses a single-chip microcomputer with the model number STM32F103C8T6.

5. The railway signal light status monitoring system according to claim 4, characterized in that, The filament monitoring unit includes a main filament monitoring circuit and an auxiliary filament monitoring circuit; The main filament monitoring circuit includes capacitor C5, zener diode D2, resistor R6, opto-isolation chip U4, resistor R7, capacitor C6, resistor R8 and capacitor C7. The first terminal of capacitor C5, the negative terminal of zener diode D2 and the first terminal of resistor R6 are all connected to the first terminal of the main filament. The first terminal of the main filament is connected to the first power pin of power supply communication interface P1. The second terminal of resistor R6, the first terminal of resistor R7 and the first terminal of capacitor C6 are all connected to the positive pole of the light-emitting end of opto-isolation chip U4. The negative pole of the light-emitting end of opto-isolation chip U4, the second terminal of capacitor C6, the second terminal of resistor R7, the positive pole of zener diode D2, the second terminal of capacitor C5 and the second terminal of the main filament are all connected to the second power pin of power supply communication interface P1. The collector of the light-receiving end of opto-isolation chip U4 is connected to the first terminal of resistor R8, the first pin of main control chip U3 and the first terminal of capacitor C7. The second terminal of resistor R8 is connected to the 3.3V power supply output terminal. The second terminal of capacitor C7 and the emitter of the light-receiving end of opto-isolation chip U4 are both grounded; The auxiliary filament monitoring circuit includes capacitor C8, zener diode D3, resistor R9, opto-isolation chip U5, resistor R10, capacitor C9, resistor R11 and capacitor C10. The first terminal of capacitor C8, the negative terminal of zener diode D3 and the first terminal of resistor R9 are all connected to the first terminal of the auxiliary filament. The first terminal of the auxiliary filament is connected to the second power pin of power supply communication interface P1. The second terminal of resistor R9, the first terminal of resistor R10 and the first terminal of capacitor C9 are all connected to the positive pole of the light-emitting end of opto-isolation chip U5. The negative pole of the light-emitting end of opto-isolation chip U5, the second terminal of capacitor C9, the second terminal of resistor R10, the positive pole of zener diode D3, the second terminal of capacitor C8 and the second terminal of the auxiliary filament are all connected to the third power pin of power supply communication interface P1. The collector of the light-receiving end of opto-isolation chip U5 is connected to the first terminal of resistor R11, the second pin of main control chip U3 and the first terminal of capacitor C10. The second terminal of resistor R11 is connected to the 3.3V power supply output terminal. The second terminal of capacitor C10 and the emitter of the light-receiving end of opto-isolation chip U5 are both grounded.

6. The railway signal lamp status monitoring system according to claim 5, wherein, Both opto-isolation chip U4 and opto-isolation chip U5 adopt opto-isolation chips of model TLP521-1.

7. The railway signal light status monitoring system according to claim 4, characterized in that, The alarm unit includes resistor R12, triode Q1, resistor R13 and alarm lamp LED1. The first terminal of resistor R12 is connected to the third pin of main control chip U3. The second terminal of resistor R12 is connected to the base of triode Q1. The emitter of triode Q1 is connected to the 3.3V power supply output terminal. The collector of triode Q1 is connected to the positive pole of alarm lamp LED1 through resistor R13. The negative pole of alarm lamp LED1 is grounded.

8. The railway signal light status monitoring system according to claim 4, wherein The DIP switch unit includes an 8-bit DIP switch S1 of model SW DIP-8. The DIP switch S1 is connected to the fourth to eleventh pins of main control chip U3.

9. The railway signal light status monitoring system according to claim 4, wherein, The CAN communication unit includes CAN bus transceiver chip U6, capacitor C11, resistor R14, resistor R15, resistor R16, resistor R17 and electrostatic protection diode U7; The first pin of the CAN bus transceiver chip U6 is connected to the 3.3V power output terminal and the first end of the capacitor C11. The second end of the capacitor C11 is grounded. The second pin of the CAN bus transceiver chip U6 is connected to the twelfth pin of the main control chip U3. The third pin of the CAN bus transceiver chip U6 is connected to the thirteenth pin of the main control chip U3. The fourth pin of the CAN bus transceiver chip U6 is grounded through the resistor R14. The fifth pin of the CAN bus transceiver chip U6 is connected to the first end of the resistor R15. The sixth pin of the CAN bus transceiver chip U6 is connected to the first end of the resistor R16. The second end of the resistor R15 is connected to the first end of the electrostatic protection diode U7, the first end of the resistor R17, and the first communication pin of the communication interface P1. The second end of the resistor R16 is connected to the second end of the electrostatic protection diode U7, the second end of the resistor R17, and the second communication pin of the communication interface P1. The third end of the electrostatic protection diode U7 is grounded.

10. The railway signal lamp status monitoring system according to claim 9, characterized in that, The CAN bus transceiver chip U6 uses a CAN bus transceiver chip with the model number SN65HVD230.

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