Track circuit microcomputer digital shunting system

Abstract

The invention provides a track circuit microcomputer digital shunting system. The track circuit microcomputer digital shunting system comprises a shunting center host and a plurality of digital shunting units, wherein each digital branching unit is in communication with the branching center host; each digital shunt unit is used for collecting sensing data of sensors arranged on two rail steel rails according to difference; the branch center host is used for obtaining the running direction of the train in the section according to the sensing data; and according to the running direction and the turnout position state, the shunting state of the rail section with poor shunting is generated. According to the invention, the train wheels are identified by collecting the information collected by the differently arranged sensors, so that the train wheels can be accurately judged; and the sensors in one acquisition point are arranged in a difference manner, so that the anti-interference performance of the acquired information is enhanced, and the accuracy of wheel identification is improved.

Description

Technical Field

[0001] This application relates to the technical field of track shunting, and particularly to a microcomputer digital shunting system for track circuits. Background Art

[0002] The problem of poor shunting in track circuits is a worldwide railway signal problem. First, its occurrence is unpredictable (it only occurs when there is a train, but not necessarily every time there is a train); second, once poor shunting occurs, it may lead to or be transformed into an accident, involving loss of life and property.

[0003] Currently, both at home and abroad, on the one hand, it is detected in advance through regular maintenance (regardless of whether there is a problem or not, the track sections are polished periodically to remove rust and dust, or sprayed, etc.). This solves the problem through periodic maintenance, which not only consumes a large amount of manpower and material resources, but also there is a phenomenon of missing one out of ten thousand due to untimely maintenance; on the other hand, using equipment such as infrared or axle counters, there are also various problems more or less, such as insufficient anti-interference ability and high cost. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the purpose of this application is to provide a microcomputer digital shunting system for track circuits with a simple structure to overcome the above problems.

[0005] In a first aspect, this application provides a microcomputer digital shunting system for track circuits, including:

[0006] A shunting center host and multiple digital shunting units;

[0007] Wherein, each of the digital shunting units communicates with the shunting center host;

[0008] Each of the digital shunting units is used to collect the induction data of sensors arranged on two track rails in a differential manner;

[0009] The shunting center host is used to obtain the running direction of the train in the section according to the induction data; and generate the shunting state of the poor shunting track section according to the running direction and the switch position state.

[0010] In a possible embodiment, the digital shunting unit includes: an acquisition circuit;

[0011] The acquisition circuit includes a voltage adjustment circuit, an excitation circuit, a logic condition circuit, and a back-check circuit;

[0012] The logic condition circuit is respectively connected to the excitation circuit, the voltage adjustment circuit, and the back-check circuit;

[0013] Among them, the voltage adjustment circuit is used to complete the voltage division adjustment of the input voltage so that the output voltage reaches the operating voltage of the logic condition circuit;

[0014] The excitation circuit is responsible for isolating and transmitting two square wave signals with a predetermined corresponding relationship to the logic condition circuit;

[0015] The feedback circuit is used to transmit the feedback voltage corresponding to the feedback signal to the logic condition circuit;

[0016] The logic condition circuit is used to make the circuit pulsate according to the square wave signal, and judge the presence or absence of the input voltage by correlating the feedback voltage with the input voltage.

[0017] In a possible embodiment, the voltage adjustment circuit includes: a rectifier diode, a switching diode, a first resistor, a second resistor, a third resistor and a first capacitor;

[0018] One end of the rectifier diode is connected to one end of the first resistor and the second resistor; the other end of the rectifier diode is connected to the other end of the second resistor and one end of the switching diode;

[0019] The other end of the first resistor is connected to the other end of the switching diode;

[0020] The first capacitor and the third resistor are respectively connected in parallel with the switching diode;

[0021] The third resistor is connected in parallel to the excitation circuit and the logic condition circuit.

[0022] In a possible embodiment, the excitation circuit includes: a first optocoupler, a second optocoupler, an eighth resistor, a tenth resistor, an eleventh resistor and a thirteenth resistor;

[0023] One end of the tenth resistor is used to receive the first square wave signal, and the other end of the tenth resistor is connected to the second end of the first optocoupler;

[0024] One end of the thirteenth resistor is used to receive the second square wave signal, and the other end of the thirteenth resistor is connected to the second end of the second optocoupler;

[0025] The first end of the first optocoupler and the first end of the second optocoupler are used to connect the operating voltage;

[0026] The fifth end of the first optocoupler and the fifth end of the second optocoupler are connected to the third resistor;

[0027] The sixth end of the first optocoupler is connected to the fourth end of the first optocoupler through the eighth resistor;

[0028] The sixth terminal of the second optocoupler is connected to the fourth terminal of the second optocoupler through the eleventh resistor.

[0029] In a possible embodiment, the feedback circuit includes: a third optocoupler, a third triode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and a second capacitor;

[0030] The first terminal of the third triode is connected to the feedback signal;

[0031] One end of the seventeenth resistor is connected to the first terminal of the third triode;

[0032] The fourteenth resistor, the fifteenth resistor, and the second capacitor are connected in parallel, and both ends of the second capacitor are respectively connected to the second terminal and the third terminal of the third triode;

[0033] One end of the sixteenth resistor is connected to the fourteenth resistor, and the other end of the sixteenth resistor is connected to the fifteenth resistor and the fourth terminal of the third optocoupler;

[0034] The third terminal of the third optocoupler is connected to the other end of the seventeenth resistor;

[0035] The first terminal and the second terminal of the third optocoupler are connected to the logic condition circuit.

[0036] In a possible embodiment, the logic condition circuit includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a ninth resistor, a twelfth resistor, a first triode, a second triode, a fourth triode, and a fifth triode; one end of the fourth resistor is connected to the third end of the third resistor, and the fourth resistor, the fifth resistor, and the sixth resistor are connected in parallel; one end of the ninth resistor is respectively connected to the other end of the fourth resistor and the third end of the third resistor, the other end of the ninth resistor is connected to the first end of the first triode, the second end of the first triode is connected to the other end of the sixth resistor, one end of the twelfth resistor is respectively connected to the fifth resistor and the third end of the third resistor, and the other end of the twelfth resistor is connected to the first end of the second triode; one end of the seventh resistor is respectively connected to the fourth resistor, the fifth resistor, and the sixth resistor; the other end of the seventh resistor is connected to the second end of the second triode; the third end of the first triode is connected to the third end of the second triode, and the third end of the second triode is connected to the first end of the third optocoupler; the first end of the fourth triode is connected between the ninth resistor and the first triode; the third end of the fourth triode is connected to the third end of the fifth triode; the first end of the fifth triode is connected between the twelfth resistor and the first end of the second triode; the second ends of the fourth triode and the fifth triode are both connected to the second end of the third optocoupler.

[0037] In a possible embodiment, the shunt center host is further configured to:

[0038] Determine whether the sensed data changes within a preset time;

[0039] If not, determine that the sensed data is a valid signal.

[0040] In a possible embodiment, the preset time is 5 ms.

[0041] In a possible embodiment, the digital shunt unit further includes a first counter and a second counter.

[0042] In a possible embodiment, after a high level is collected, the first counter is incremented by 1, and at the same time the second counter is decremented by 1; after a low level is collected, the second counter is incremented by 1, and at the same time the first counter is decremented by 1; wherein, the values of the first counter and the second counter are (0, 5), when the first counter is 5, the digital shunt unit considers that a high level signal of 5 ms has been currently collected; if the second counter is 5, the digital shunt unit considers that a low level signal of 5 ms has been currently collected.

[0043] Advantageous effects:

[0044] A microcomputer digital shunting system for track circuits provided by this application uses multiple digital shunting units to collect the induction data of sensors installed on two track rails, and uses a shunting center host to obtain the running direction of the train in the section according to the induction data; and generates the shunting state of the shunting-defective track section according to the running direction and the switch position state. By collecting the information collected by sensors arranged in a differential manner to identify the passing of the train wheels, the train wheels can be accurately determined; and the differential arrangement of the sensors within one collection point not only enhances the anti-interference ability of the collected information, but also improves the accuracy of wheel identification. Brief Description of the Drawings

[0045] Figure 1 It is a schematic structural diagram of a microcomputer digital shunting system for track circuits provided by an embodiment of this application;

[0046] Figure 2 is Figure 1 a schematic structural diagram of the acquisition circuit in the shown microcomputer digital shunting system for track circuits;

[0047] Figure 3 is Figure 2 a schematic structural diagram of the voltage adjustment circuit in the shown acquisition circuit;

[0048] Figure 4 is Figure 2 a schematic structural diagram of the excitation circuit in the shown acquisition circuit;

[0049] Figure 5 is Figure 2 a schematic structural diagram of the logic condition circuit in the shown acquisition circuit;

[0050] Figure 6 is Figure 2 a schematic structural diagram of the back-check circuit in the shown acquisition circuit;

[0051] Figure 7 is Figure 1 a schematic flow diagram of the filtering process performed by the shunting center host in the microcomputer digital shunting system for track circuits shown. Detailed Embodiments

[0052] To facilitate the understanding of this application, the following will describe this application more comprehensively with reference to the relevant drawings. The preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0053] The description of the following embodiments refers to the attached drawings, which are used to illustrate specific embodiments in which the present application can be implemented. The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" as used in the present application, unless otherwise specified, both include direct and indirect connection (coupling). The directional terms mentioned in the present application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present application.

[0054] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication between two elements inside. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations. It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include", "may include", "contain", or "may contain" used in the present application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the term "include" or "contain" means the existence of the corresponding features, numbers, steps, operations, elements, components or their combinations disclosed in the specification, and does not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components or their combinations, and is intended to cover non-exclusive inclusion.

[0055] As Figure 1 shown, an embodiment of the present application provides a track circuit microcomputer digital shunting system, and the track circuit microcomputer digital shunting system includes: a shunting center host 10 and a plurality of digital shunting units 20.

[0056] Optionally, the shunting center host 10 communicates with the digital shunting unit 20 through a switch 30.

[0057] Among them, each of the digital shunting units 20 is used to collect the induction data of sensors arranged on two track rails in a differential manner.

[0058] Optionally, the digital branch unit 20 can provide about 24 acquisition channels for sensor information. The information is subject to the "two-out-of-two" consistency check to ensure the high reliability of the acquired information. At the same time, the working status of the sensors, the environmental status of the digital branch unit 20, the working status of the digital branch unit 20, and alarm and other information are transmitted to the indoor central host through the optical switch for the system host to perform branch comprehensive judgment and processing. At the same time, it receives the timing, operation instructions, initialization, channel setting and other information sent by the central host. Thus, the microcomputer digital branch system realizes the monitoring of indoor and outdoor equipment.

[0059] The system is deployed in units of stations, connecting indoor and outdoor equipment, and realizing branch indication for the connected track branch failure sections. The sensors are arranged in pairs (2) at the entrance and exit of the monitored branch failure sections.

[0060] Specifically, the sensor for collecting whether the wheel passes in the digital branch unit 20 is a magnetic steel sensor, and the output signal is DC low level or high level, which can meet the installation requirements of 43, 50, 60, and 75 rails. This sensor is a non-safe sensor. In order to achieve the purpose of safe output, an acquisition circuit is set in the digital branch unit 20 and used in cooperation with the magnetic steel sensor, so as to ensure that the passing train signal output by the collected sensor is reliable.

[0061] The branch center host 10 is used to obtain the running direction of the train in the section according to the induction data; and generate the branch state of the branch failure track section according to the running direction and the switch position state.

[0062] In a possible embodiment, as Figure 2 shown, the digital branch unit includes: an acquisition circuit; the acquisition circuit includes a voltage adjustment circuit, an excitation circuit, a logic condition circuit, and a feedback circuit; wherein, the logic condition circuit is respectively connected to the excitation circuit, the voltage adjustment circuit, and the feedback circuit; wherein, the voltage adjustment circuit is used to complete the voltage division adjustment of the input voltage so that the output voltage reaches the working voltage of the logic condition circuit; the excitation circuit is used to isolate and transmit two square wave signals with a predetermined corresponding relationship to the logic condition circuit; the feedback circuit is used to transmit the feedback voltage corresponding to the feedback signal to the logic condition circuit; the logic condition circuit is used to make the circuit pulsate according to the square wave signal, and judge the presence or absence of the input voltage by associating the feedback voltage with the input voltage.

[0063] Exemplarily, as Figure 3As shown, the voltage adjustment circuit includes a rectifying diode D1, a switching diode D2, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1. One end of the rectifying diode D1 is connected to one end of the first resistor R1 and the second resistor R2. The other end of the rectifying diode D1 is connected to the other end of the second resistor R2 and one end of the switching diode D2. The other end of the first resistor R1 is connected to the other end of the switching diode D2. The first capacitor C1 and the third resistor R3 are respectively connected in parallel with the switching diode D2. The third resistor R3 is connected in parallel to the excitation circuit and the logic condition circuit.

[0064] Optionally, the resistance value of the third resistor R3 is 550 ohms.

[0065] Optionally, the third resistor R3 is a four-terminal resistor.

[0066] Exemplarily, as Figure 4 As shown, the excitation circuit includes a first optocoupler U1, a second optocoupler U2, an eighth resistor R8, a tenth resistor R10, an eleventh resistor R11, and a thirteenth resistor R13. One end of the tenth resistor R10 is used to receive the first square wave signal Dynamic_In1, and the other end of the tenth resistor R10 is connected to the second terminal of the first optocoupler U1. One end of the thirteenth resistor R13 is used to receive the second square wave signal Dynamic_In2, and the other end of the thirteenth resistor R13 is connected to the second terminal of the second optocoupler U2. The first terminal of the first optocoupler U1 and the first terminal of the second optocoupler U2 are used to connect to the operating voltage of 5V. The fifth terminal of the first optocoupler U1 and the fifth terminal of the second optocoupler U2 are connected to the third resistor R3. The sixth terminal of the first optocoupler U1 is connected to the fourth terminal of the first optocoupler U1 through the eighth resistor R8. The sixth terminal of the second optocoupler U2 is connected to the fourth terminal of the second optocoupler U2 through the eleventh resistor R11.

[0067] Optionally, the resistance values of the eighth resistor R8 and the eleventh resistor R11 are 215 kΩ.

[0068] Exemplarily, as Figure 5As shown, the logic condition circuit includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a ninth resistor R9, a twelfth resistor R12, a first triode Q1, a second triode Q2, a fourth triode Q4, and a fifth triode Q5; one end of the fourth resistor R4 is connected to the third end 3 of the third resistor R3, and the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are arranged in parallel; one end of the ninth resistor R9 is respectively connected to the other end of the fourth resistor R4 and the third end 3 of the third resistor R3, the other end of the ninth resistor R9 is connected to the first end of the first triode Q1, the second end of the first triode Q1 is connected to the other end of the sixth resistor R6, one end of the twelfth resistor R12 is respectively connected to the fifth resistor R5 and the third end 3 of the third resistor R3, and the other end of the twelfth resistor R12 is connected to the first end of the second triode Q2; one end of the seventh resistor R7 is respectively connected to the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6; the other end of the seventh resistor R7 is connected to the second end of the second triode Q2; the third end of the first triode Q1 is connected to the third end of the second triode Q2, and the third end of the second triode Q2 is connected to the feedback circuit; the first end of the fourth triode Q4 is connected between the ninth resistor R9 and the first triode Q1; the third end of the fourth triode Q4 is connected to the third end of the fifth triode Q5; the first end of the fifth triode Q5 is connected between the twelfth resistor R12 and the first end of the second triode Q2; the second ends of the fourth triode Q4 and the fifth triode Q5 are both connected to the feedback circuit.

[0069] Optionally, the logic condition circuit is the core of the entire acquisition circuit, and it realizes the following functions:

[0070] As Figure 3 - 5 shown, when there is a DC 24V voltage input externally and one of the first optocoupler U1 and the first optocoupler U2 is conducting and the other is in the off state, the third optocoupler N1 is turned on. In other cases, the third optocoupler N1 is turned off, and the logical correspondence is shown in Table 1.

[0071] U1 U2 Q1 Q2 Q4 Q5 N1 Turn off Turn off Turn off Turn off Turn off Turn off Turn off Turn on Turn off Turn off Turn on Turn on Turn off Turn on Turn off Turn on Turn on Turn off Turn off Turn on Turn on Turn on Turn on Turn off Turn off Turn off Turn off Turn off

[0072] Table 1

[0073] Among them, the conduction of the second optocoupler U2 has an exclusive-OR relationship with the conduction of the first optocoupler U1 and the third optocoupler N1. When the first optocoupler U1 is turned on and the second optocoupler U2 is turned off, the external voltage passes through the fifth resistor R5, the twelfth resistor R12, the BE of the second triode Q2, the primary of N1, the EB of the fourth triode Q4, the ninth resistor R9, the secondary of the first optocoupler U1 to 024V, providing a base bias current of about 70uA for the second triode Q2 and the fourth triode Q4. When the first optocoupler U1 is turned off and the second optocoupler U2 is turned on, the external voltage passes through the fourth resistor R4, the ninth resistor R9, the BE of the first triode Q1, the primary of N1, the EB of the fifth triode Q5, the twelfth resistor R12, the secondary of the second optocoupler U2 to 024V, providing a base bias current of about 70uA for the first triode Q1 and the fifth triode Q5. In this way, the external voltage passes through the sixth resistor R6, the CE of the first triode Q1, the primary of N1, the CE of the fifth triode Q5 to 024V to generate a current path, causing the third optocoupler N1 to conduct.

[0074] Optionally, the feedback circuit includes: a third optocoupler N1, a third triode Q3, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and a second capacitor C2; the first end of the third triode Q3 is connected to the feedback signal Dynamic_Det; one end of the seventeenth resistor R17 is connected to the first end of the third triode Q3; the fourteenth resistor R14, the fifteenth resistor R15, and the second capacitor C2 are connected in parallel, and both ends of the second capacitor C2 are respectively connected to the second end and the third end of the third triode Q3; one end of the sixteenth resistor R16 is connected to the fourteenth resistor R14, and the other end of the sixteenth resistor R16 is connected to the fifteenth resistor R15 and the fourth end of the third optocoupler N1; the third end of the third optocoupler N1 is connected to the other end of the seventeenth resistor R17. The 1 / 2 end of the third optocoupler N1 is used to input an excitation square wave, that is, the first end 1 of the third optocoupler N1 is connected to the second end of the second triode Q2, and the second end 2 of the third optocoupler N1 is connected to the second ends of the fifth triode Q2 and the fourth triode Q4.

[0075] Optionally, the shunt center host 10 is further configured to: determine whether the sensed data changes within a preset time; if not, determine that the sensed data is a valid signal.

[0076] Optionally, the preset time is 5ms

[0077] That is to say, in order to further improve the security of the collected information, a software security filtering design is proposed at the software level to ensure the correctness of the final collected result.

[0078] According to the actual passing vehicle situation on site, an information change period is set to 5 ms. That is, if there is no change in the collected signal within 5 ms, the CPLD (Complex Programmable Logic Device, digital branch unit) considers the collected signal as a valid signal, and the collection frequency is once every 1 ms. Based on this, a filtering algorithm is designed to filter the collected signal, as Figure 7 shown. Specifically:

[0079] Set the first counter T1 and the second counter T2. After a high level is collected at a certain moment, the first counter T1 is incremented by 1, and at the same time, the second counter T2 is decremented by 1. Similarly, after a low level is collected at a certain moment, the second counter T2 is incremented by 1, and at the same time, the first counter T1 is decremented by 1. The lowest value of the counter is 0, and the highest value is 5. When the first counter T1 is 5, the digital branch unit considers that a high-level signal of 5 ms has been currently collected. Similarly, when the second counter T2 is 5, the digital branch unit considers that a low-level signal of 5 ms has been currently collected. By repeating this cycle of detection, the dynamic collection and filtering of safety signals are realized.

[0080] In summary, a microcomputer digital branch system for track circuits provided in this embodiment identifies the passing of train wheels through the collection points (each collection point uses two sensors, which are differentially arranged and fixed on two steel rails respectively) set on both sides of the track circuit insulation joint. The system cross-checks and safely collects the information of the collection points before and after the insulation joint, enabling the accurate determination of train wheels. For each collection point, the information of its inductor is safely filtered by the outdoor branch collection unit, enhancing the usability and reliability of the inductor information collection. The differential arrangement of the inductors within a collection point not only enhances the anti-interference ability of the collected information but also improves the accuracy of wheel identification. In addition, the system collects the status of adjacent track sections, which is also used as a calculation condition for whether there is a train at the collection point in this section, improving the calculation accuracy of train wheels and the usability of the system. At the same time, optical fibers are used for connection indoors and outdoors, reducing the system cost. The system center collects the information of the outdoor inductors and combines it with the information of the indoor track section and switch position status for fusion. After safe calculation, it outputs the branch status (idle or branched) of the track section and automatically realizes the branch control of the track section, thereby solving the problem of poor branch of the track circuit.

[0081] It should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise specifically defined.

[0082] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0083] It should be understood that the application of this application is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of this application. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A microcomputer digital shunting system for track circuits, characterized in that, Including: A shunt center host and multiple digital shunt units; Among them, each of the digital shunt units communicates with the shunt center host; Each of the digital shunt units is used to collect the induction data of sensors arranged on two track rails according to differential; The shunt center host is used to obtain the running direction of the train in the section according to the induction data; and generate the shunt state of the shunt-defective track section according to the running direction and the switch position state.

2. The microcomputer digital shunt system for track circuits according to claim 1, characterized in that The digital shunt unit includes: an acquisition circuit; The acquisition circuit includes a voltage regulation circuit, an excitation circuit, a logic condition circuit, and a feedback circuit; The logic condition circuit is respectively connected to the excitation circuit, the voltage regulation circuit, and the feedback circuit; Among them, the voltage regulation circuit is used to complete the voltage division adjustment of the input voltage so that the output voltage reaches the working voltage of the logic condition circuit; The excitation circuit is used to isolate and transmit two square wave signals with a predetermined corresponding relationship to the logic condition circuit; The feedback circuit is used to transmit the feedback voltage corresponding to the feedback signal to the logic condition circuit; The logic condition circuit is used to make the circuit pulsate according to the square wave signal and judge the presence or absence of the input voltage by correlating the feedback voltage with the input voltage.

3. The track circuit microcomputer digital shunt system according to claim 2, wherein The voltage regulation circuit includes: a rectifier diode, a switching diode, a first resistor, a second resistor, a third resistor, and a first capacitor; Among them, one end of the rectifier diode is connected to one end of the first resistor and the second resistor; the other end of the rectifier diode is connected to the other end of the second resistor and one end of the switching diode; The other end of the first resistor is connected to the other end of the switching diode; The first capacitor and the third resistor are respectively connected in parallel with the switching diode; The third resistor is connected in parallel to the excitation circuit and the logic condition circuit.

4. The track circuit microcomputer digital shunt system according to claim 3, wherein The excitation circuit includes: a first optocoupler, a second optocoupler, an eighth resistor, a tenth resistor, an eleventh resistor, and a thirteenth resistor; One end of the tenth resistor is used to receive the first square wave signal, and the other end of the tenth resistor is connected to the second end of the first optocoupler; One end of the thirteenth resistor is used to receive the second square wave signal, and the other end of the thirteenth resistor is connected to the second end of the second optocoupler; The first end of the first optocoupler and the first end of the second optocoupler are used to connect the working voltage; The fifth end of the first optocoupler and the fifth end of the second optocoupler are connected to the third resistor; The sixth end of the first optocoupler is connected to the fourth end of the first optocoupler through the eighth resistor; The sixth end of the second optocoupler is connected to the fourth end of the second optocoupler through the eleventh resistor.

5. The track circuit microcomputer digital shunting system according to claim 4, characterized in that, The feedback circuit includes: a third optocoupler, a third triode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and a second capacitor; The first end of the third triode is connected to the feedback signal; One end of the seventeenth resistor is connected to the first end of the third triode; The fourteenth resistor, the fifteenth resistor, and the second capacitor are connected in parallel, and two ends of the second capacitor are respectively connected to a second end and a third end of the third triode; One end of the sixteenth resistor is connected to the fourteenth resistor, and the other end of the sixteenth resistor is connected to the fifteenth resistor and a fourth end of the third optocoupler; A third end of the third optocoupler is connected to the other end of the seventeenth resistor; A first end and a second end of the third optocoupler are connected to the logic condition circuit.

6. The track circuit microcomputer digital shunt system according to claim 5, characterized in that, The logic condition circuit includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a ninth resistor, a twelfth resistor, a first triode, a second triode, a fourth triode, and a fifth triode; one end of the fourth resistor is connected to a third end of the third resistor, and the fourth resistor, the fifth resistor, and the sixth resistor are connected in parallel; one end of the ninth resistor is respectively connected to the other end of the fourth resistor and the third end of the third resistor, the other end of the ninth resistor is connected to a first end of the first triode, a second end of the first triode is connected to the other end of the sixth resistor, one end of the twelfth resistor is respectively connected to the fifth resistor and the third end of the third resistor, the other end of the twelfth resistor is connected to a first end of the second triode; one end of the seventh resistor is respectively connected to the fourth resistor, the fifth resistor, and the sixth resistor; the other end of the seventh resistor is connected to a second end of the second triode; a third end of the first triode is connected to a third end of the second triode, and the third end of the second triode is connected to the first end of the third optocoupler; a first end of the fourth triode is connected between the ninth resistor and the first triode; a third end of the fourth triode is connected to a third end of the fifth triode; a first end of the fifth triode is connected between the twelfth resistor and the first end of the second triode; a second end of the fourth triode and a second end of the fifth triode are both connected to the second end of the third optocoupler.

7. The microcomputer digital shunt system for track circuits according to any one of claims 2-6, characterized in that The shunt center host is further configured to: Determine whether the sensed data changes within a preset time; If not, determine that the sensed data is a valid signal.

8. The microcomputer digital shunt system for track circuits according to claim 7, characterized in that The preset time is 5 ms.

9. The track circuit microcomputer digital shunt system according to claim 8, characterized in that The digital shunt unit further includes a first counter and a second counter.

10. The microcomputer digital shunt system for track circuits according to claim 7, characterized in that After a high level is collected, the first counter is incremented by 1, and at the same time the second counter is decremented by 1; after a low level is collected, the second counter is incremented by 1, and at the same time the first counter is decremented by 1; wherein, the values of the first counter and the second counter are (0, 5), when the first counter is 5, the digital shunt unit considers that a high level signal of 5 ms is currently collected; if when the second counter is 5, the digital shunt unit considers that a low level signal of 5 ms is currently collected.

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