SW board card and full-electronic computer interlocking system

Abstract

The utility model discloses an SW board card and full-electronic computer interlocking system, which comprises a CPU (central processing unit) module, an internal plug connector, a relay control circuit, a safety output circuit, a turnout current sensing circuit and a turnout state indicating circuit, the safety output circuit is respectively connected with the turnout current induction circuit, the turnout state indication circuit and the relay control circuit, the internal plug connector is respectively connected with the turnout current induction circuit, the turnout state indication circuit, the relay control circuit and the CPU module, and the safety output circuit is connected with the external plug connector. The turnout state information can be monitored in real time, and the safety of railway transportation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of railway computer interlocking, in particular to a SW board and a full electronic computer interlocking system. Background Art

[0002] In the computer interlocking system, the control of the turnout is involved. The turnout is an important device that controls the direction and safety of the train. The traditional turnout control method uses mechanical interlocking and relay control, which has a high failure rate and low safety. Utility Model Content

[0003] The purpose of the utility model is to provide a SW board and a full electronic computer interlocking system in order to solve at least one of the above technical problems.

[0004] In the first aspect, an embodiment of the utility model provides a SW board, comprising: a CPU module, an internal connector, a relay control circuit, a safety output circuit, a turnout current sensing circuit and a turnout status indication circuit, wherein the safety output circuit is respectively connected to the turnout current sensing circuit, the turnout status indication circuit and the relay control circuit, the internal connector is respectively connected to the turnout current sensing circuit, the turnout status indication circuit, the relay control circuit and the CPU module, and the safety output circuit is connected to the external connector; the CPU module comprises a dual CPU chip structure, which is used to control the safety output circuit through the relay control circuit to power the switch; the turnout current sensing circuit is used to convert the collected current signal into a voltage signal, and send the voltage signal to the CPU module; the turnout status indication circuit is used to collect the status voltage signal of the switch, and send the status voltage signal to the full electronic computer interlocking system through the CPU module, wherein the status voltage signal is used to characterize whether the switch is forward or reverse.

[0005] Furthermore, the two SW boards are connected in parallel on the same external connector, and the two SW boards are connected via CAN communication.

[0006] Furthermore, the turnout current sensing circuit includes: a current sensor and a first operational amplifier, wherein the model of the current sensor is DLT6.25A, and the model of the first operational amplifier is LM324.

[0007] Furthermore, the turnout current sensing circuit includes: a current transformer and a second operational amplifier, wherein the model of the current transformer is TA1013-3Z, and the model of the second operational amplifier is LM2904BQDRQ1.

[0008] Furthermore, the switch status indication circuit includes: a DC-DC power supply chip and an optocoupler, wherein the model of the DC-DC power supply chip is RS-2405S / H3, and the model of the optocoupler is TLP127.

[0009] Furthermore, the switch state indicating circuit includes: a third operational amplifier, wherein the model of the third operational amplifier is LM2904BQDRQ1.

[0010] Furthermore, the relay control circuit includes: an NMOS tube, a first PMOS tube and an indicator light, wherein the model of the NMOS tube is BSS138P,215, and the model of the PMOS tube is BSS84AK,215.

[0011] Furthermore, the safety output circuit includes: a safety relay, wherein the model of the safety relay is HOZ-462-1529.

[0012] Furthermore, the SW board also includes: a power supply circuit, wherein the power supply circuit includes a power supply block, a DC-DC converter module and a second PMOS tube, the model of the power supply block is MJWI20-24D12, and the model of the second PMOS tube is SPD30P06PG.

[0013] In a second aspect, an embodiment of the utility model further provides a fully electronic computer interlocking system, comprising the SW board card described in the first aspect.

[0014] The utility model provides a SW board and a fully electronic computer interlocking system. The SW board acquires the state information of the turnout in real time by collecting the current of the switch machine, monitors and controls the turnout state, and realizes the collection, conditioning and processing functions of the microcomputer monitoring system for field signals. The turnout module is designed according to safety technologies such as closed-loop control, anti-interference protection, dual verification of hardware and software, and double disconnection of control circuits, in accordance with the principle of fault safety, ensuring that when a fault or abnormal situation occurs, it will not affect the safe operation of the train or vehicle, ensuring the safety of the system and improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of a SW board provided by an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of another SW board provided by an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the internal structure of the SW board corresponding to the solution 1 provided in the embodiment of the utility model;

[0019] Figure 4 A schematic diagram of the internal structure of the SW board corresponding to the second solution provided in the embodiment of the utility model;

[0020] Figure 5 A schematic diagram of a turnout current sensing circuit corresponding to solution 1 provided in an embodiment of the utility model;

[0021] Figure 6 A schematic diagram of a turnout current sensing circuit corresponding to solution 2 provided in an embodiment of the utility model;

[0022] Figure 7 A schematic diagram of a turnout state indicating circuit corresponding to the first solution provided in the embodiment of the utility model;

[0023] Figure 8 A schematic diagram of a turnout state indicating circuit corresponding to the second solution provided in the embodiment of the utility model;

[0024] Fig. 9 A schematic diagram of a relay control circuit provided by an embodiment of the utility model;

[0025] Fig.10 A schematic diagram of a safety output circuit provided by an embodiment of the utility model;

[0026] Fig.11 A schematic diagram of a power supply circuit provided in an embodiment of the utility model;

[0027] Fig.12 A schematic diagram of the front structure of the SW board provided by the embodiment of the utility model;

[0028] Fig.13 A schematic diagram of the side structure of a SW board provided in an embodiment of the utility model.

[0029] In the figure: 10, panel, 20, panel puller, 30, indicator light, 31, control indicator light, 32, indication indicator light, 33, acquisition indicator light, 34, power indicator light, 35, switch indicator light, 36, power switch, 40, guard plate, 50, main board, 60, CPU module, 70, internal connector, 80, relay control circuit, 90, safety output circuit, 91, safety relay, 92, NMOS, 93, PMOS, 100, turnout current sensing circuit, 101, current sensor, 102, operational amplifier, 103, current transformer, 110, turnout status indication circuit, 112, DC-DC power supply chip, 113, optocoupler, 120, external connector, 130, power supply circuit, 131, power supply block. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Embodiment 1

[0032] Figure 1 1 is a schematic diagram of the principle of a SW board provided according to an embodiment of the utility model, and the SW board is applied to a fully electronic computer interlocking system. Figure 1 As shown, the SW board includes: a CPU module 60, an internal connector 70, a relay control circuit 80, a safety output circuit 90, a turnout current sensing circuit 100 and an external connector 120, wherein the safety output circuit is respectively connected to the turnout current sensing circuit, the turnout state indicating circuit and the relay control circuit, the internal connector is respectively connected to the turnout current sensing circuit, the turnout state indicating circuit, the relay control circuit and the CPU module, and the safety output circuit is connected to the external connector;

[0033] The CPU module includes a dual CPU chip structure, which is used to control the safety output circuit through the relay control circuit to supply power to the switch machine;

[0034] The turnout current sensing circuit is used to convert the collected current signal into a voltage signal and send the voltage signal to the CPU module;

[0035] The turnout state indicating circuit is used to collect the state voltage signal of the switch machine and send the state voltage signal to the fully electronic computer interlocking system through the CPU module, wherein the state voltage signal is used to indicate whether the switch machine is rotating forward or reverse.

[0036] It should be noted that the SW board power supply circuit adopts a PMOS tube anti-reverse connection design to ensure that the board will not be burned when the external power supply and GND are connected in reverse, and a combination of a self-recovery fuse and a bidirectional TVS tube is used to protect the front-stage circuit from ESD and lightning surges. A power switch is added to the power supply circuit. Before plugging and unplugging the SW board, the power switch must be turned off to prevent short circuits during the plugging and unplugging of the board, thereby ensuring the safety of the interlocking system. Secondly, the SW board has two turnout current sensing circuits. In solution one, the turnout current sensing circuit of the SW board completes the acquisition of the on-site switch machine current signal through a current sensor and an op amp self-comparator circuit. The current signal is converted into a voltage signal through the current sensor, and the voltage signal is input into the CPU through the op amp comparator circuit. Solution 2: The switch current sensing circuit of the SW board uses a current transformer and an op amp to build a current collection circuit to complete the collection of the current signal of the switch machine on site. The current signal is converted into a smaller current through the current transformer, and the small current signal is converted into a voltage signal using a sampling resistor. The voltage signal is input into the CPU through the amplification gain of the op amp. The SW board has two switch status display circuits. Solution 1: The voltage input through the external connector outputs the voltage signal on site through the circuit built by the power chip and the optocoupler. The power chip outputs 3.3V to provide a pull-up source for the optocoupler C pole. The CPU module interface collects the output voltage signal. In this solution, the optocoupler can play an isolation role to prevent the input voltage from causing crosstalk to the collected signal. Solution 2: The voltage input through the external connector outputs the voltage signal on site through the op amp follower circuit. The CPU module interface collects the output voltage signal. This solution has higher accuracy and more stable signals. Finally, the SW board has an 8-channel relay control circuit. The relay control circuit uses a MOS tube to drive the relay control output. Its circuit controls the safety output circuit. The safety output circuit part uses a two-stage control circuit. The output will only be generated when the two relay switches are closed at the same time. The CPU interface samples the voltage at both ends of the relay switch, and can diagnose short-circuit and open-circuit conditions, ensuring that the fault will not affect the circuit safety.

[0037] In the embodiment of the utility model, a 2×2 take 2 mechanism is adopted between SW boards, such as Figure 2As shown in the figure, two SW boards are connected in parallel on the same external interface, and CAN communication is used between the two SW boards. When one of the SW boards fails, a fault message is sent through CAN communication. When the other board receives the fault message, it replaces the faulty SW board to continue collecting data from the external interface, which will not affect normal work and improve the stability of the system. If the customer does not have a 2×2 take 2 mechanism requirement between modules, the SW boards can also be used independently without affecting each other.

[0038] The CPU module adopts a 2-out-of-2 control method. The dual CPUs receive the turnout control command sent by the interlocking machine through the communication interface, and then the relay control circuit controls the safety output circuit to complete the work of powering the external switch machine. The safety output circuit is connected to the turnout current sensing circuit. The current sensing circuit converts the collected current signal into a voltage signal and reports it to the CPU. The CPU module uses the collected signal to monitor the current size of the switch machine. The turnout status indication circuit determines whether the switch machine is forward or reverse through the collected voltage signal, reports it to the interlocking machine through the CPU module, and indicates it with an indicator light.

[0039] like Figure 3 and Figure 4 As shown, Figure 3 and Figure 4 Schematic diagrams of the internal structure of the SW board corresponding to Scheme 1 and Scheme 2 respectively, wherein the internal structure includes a main board 50, an internal connector 70, a relay control circuit 80, a safety output circuit 90, a switch current sensing circuit 100, and a switch status indicating circuit 110 arranged on the main board 50, wherein the internal connector 70 is arranged in the middle of the main board, the CPU module 60 is connected to the main board 50 through the internal connector 70, and the external connector 120 is arranged at one end of the main board 50, and the external connector 120 extends out of the edge of the main board 50 to facilitate the input of external AC voltage signals and switch machine current signals.

[0040] like Figure 5 As shown, Figure 5 This is a schematic diagram of the turnout current sensing circuit of the SW board described in Scheme 1, where the main components are the current sensor model DLT6.25A, input current 6.25A, output current 25mA. The operational amplifier model is LM324, which is composed of four independent, high-gain amplifiers. The SW board described in this utility model should be a 2-way current sensing circuit, and only one way is taken as an example below.

[0041] Specifically, the current signal of the switch machine is sent to the first end of the safety output circuit 90 through the external connector 120. When the two relay switches are closed at the same time, the current signal is input into the current sensor 101 through the safety output circuit 90. The current sensor outputs 25mA current, which is converted into a voltage signal through the sampling resistor. Since the switch machine has forward and reverse rotation, the voltage signal collected during forward rotation is positive voltage, and the voltage signal collected during reverse rotation is negative voltage. Only positive voltage signals can be collected in the CPU module 60, so the positive / negative voltage signals are converted into positive voltage signals through the comparator circuit built by the operational amplifier and input to the CPU interface. The second end of the turnout current sensing circuit 100 is connected to the CPU module 60 through the internal connector 70, and then the collected current signal is reported to the interlocking machine through the CPU module 60, and the collection indicator light 33 in the indicator light 30 is lit.

[0042] Figure 6 This is a schematic diagram of the turnout current sensing circuit of the SW board described in the second solution of the utility model. The main components are the current transformer, whose model is TA1013-3Z, with an input rated current of 500mA and an output current of 5mA. It needs to match the sampling resistor of 100Ω, has strong voltage isolation capability, and is safe and reliable. The operational amplifier model is LM2904BQDRQ1, with an input voltage range of 3-36V, internally integrated EMI and RF filters, and has unit gain stability. The SW board described in the utility model should be a 2-way current sensing circuit, and only one way is taken as an example below.

[0043] Specifically, the current signal of the switch machine is sent to the first end of the safety output circuit 90 through the external connector 120. When the two relay switches are closed at the same time, the current signal is input into the current transformer 103 through the safety output circuit 90. The current transformer outputs 5mA current, which is converted into a voltage signal through a 100Ω sampling resistor. Since the switch machine has forward and reverse rotation, the voltage signal collected during forward rotation is a positive voltage, and the voltage signal collected during reverse rotation is a negative voltage. Only positive voltage signals can be collected in the CPU module 60, where the reference voltage in the self-built circuit is 3.9V, so the positive / negative voltage signals are converted into positive voltage signals through the collection circuit built by the operational amplifier, but the values ​​are different, 4.4V during forward rotation and 3.4V during reverse rotation. The voltage is input to the CPU interface, and the value of the collected voltage can also be used to determine whether the switch machine is rotating forward or reverse. The second end of the turnout current sensing circuit 100 is connected to the CPU module 60 via the internal connector 70 , and then the collected current signal is reported to the interlocking machine via the CPU module 60 , and the collection indicator light 33 in the indicator light 30 is lit.

[0044] Figure 7This is a schematic diagram of the turnout status display circuit of the SW board described in the first solution of the utility model, in which the main components are the DC-DC power chip model RS-2405S / H3, the output voltage is 3.3V, and it has voltage isolation and short-circuit protection functions. The optocoupler model is TLP127, which can achieve input-output voltage isolation. The SW board described in the utility model should be a 2-way status display circuit, and only one way is taken as an example below.

[0045] Specifically, the voltage signal is sent to the first end of the switch status indication circuit 110 through the external connector 120. When the external switch machine rotates forward, a voltage is generated between the external connectors 2X1 and 2X3. When the external switch machine rotates reversely, a voltage is generated between the external connectors 2X2 and 2X3. The voltage enters the input end of the optocoupler 113 after resistor voltage division, and the output voltage of the DC-DC power supply chip 112 provides a pull-up source for the optocoupler 113. At this time, the optocoupler 113 enters the working state and outputs a voltage signal to the CPU. The forward and reverse rotation state of the switch machine is judged according to the presence or absence of voltage at the collection point. The second end of the switch status indication circuit 110 is connected to the CPU module 60 through the internal connector 70, and the collected voltage signal is reported to the interlocking machine through the CPU module 60, and the indicating indicator light 32 in the indicator light 30 is lit.

[0046] Figure 8 This is a schematic diagram of the turnout status display circuit of the SW board described in the second solution of the utility model, in which the main components are the operational amplifier model LM2904BQDRQ1, the input voltage range is 3-36V, the internal integrated EMI and RF filters, and the unit gain stability. The SW board described in the utility model should be a 2-way status display circuit, and only one way is taken as an example below.

[0047] Specifically, the voltage signal is sent to the first end of the switch state indicating circuit 110 through the external connector 120. When the external switch rotates forward, a voltage is generated between the external connectors 2X1 and 2X3. When the external switch rotates reversely, a voltage is generated between the external connectors 2X2 and 2X3. The voltage enters the operational amplifier 102 after resistance division to follow the circuit output voltage signal. The forward and reverse rotation state of the switch is judged according to the presence or absence of voltage at the collection point. The second end of the switch state indicating circuit 110 is connected to the CPU module 60 through the internal connector 70, and the collected voltage signal is reported to the interlocking machine through the CPU module 60, and the indicating indicator light 32 in the indicator light 30 is lit.

[0048] Fig. 9 and Fig.10This is a schematic diagram of the relay control circuit and safety output circuit of the SW board described in the first and second schemes of the utility model, wherein the main components are NMOS model BSS138P, 215, its RDSon is 0.9Ω, VGS (th) voltage 1.2V, PMOS model BSS84AK, 215, its RDSon is 7.5Ω, VGS (th) voltage -1.6V, safety relay 101, model HOZ-462-1529, with 24VDC monostable, 750 ohms, 2 normally open, 2 normally closed contacts. The SW board described in the utility model should be an 8-way relay control circuit, and only one way is taken as an example below.

[0049] Specifically, the output voltage 24V of the power supply circuit 130 is input to the second end of the relay control circuit 80. The operating power supply of the safety relay 91 is the output voltage 24V of the power supply circuit 130. The circuit has a self-diagnosis function. The CPU interface recovers the voltage at both ends of the relay switch. The IO port of the CPU module 60 controls the relay control circuit 80 through the MOS tube, and then controls the safety output circuit 90. The safety output circuit 90 adopts two-stage control. The two relay switch contacts are closed at the same time to output a signal, thereby inputting a signal to the turnout current sensing circuit 100 and lighting the control indicator light 31 in the indicator light 30.

[0050] Fig.11 This is a schematic diagram of the power circuit of the SW board described in the first and second schemes of the utility model. The power circuit 130 is one of the important components of the overall circuit. The power block 131 model is MJWI20-24D12, a new generation of high-performance DC-DC converter module, which converts 24V voltage into 24V voltage. The PMOS model is SPD30P06PG, VDS voltage is 60V, ID current is 16A, and Rdson resistance is 55mΩ. First, turn on the power switch 36 of the module, the first end of the power circuit is connected to the internal connector 70, and the CPU module 60 provides it with a 24V input voltage. The input voltage passes through the fuse, power inductor, and TVS tube protection circuit, and then provides the input voltage to the power chip through the PMOS 93 body diode, and at the same time, the power indicator light 34 and the switch indicator light 35 in the indicator light 30 are lit. The SW board power circuit part adds anti-reverse connection protection. When the power supply and GND are reversed, the PMOS is not turned on and cannot provide power to the subsequent circuit, preventing damage to the subsequent circuit components and realizing the anti-reverse connection protection function.

[0051] The embodiment of the utility model provides a fully electronic computer interlocking system SW board, which also includes a panel 10, a panel puller 20, an indicator light 30, a guard plate 40, and an external connector 120. Fig.11It is a front structural schematic diagram of a fully electronic computer interlocking system SW board provided according to the first and second schemes of the utility model. Fig.13 It is a side structural schematic diagram of a SW board of a fully electronic computer interlocking system provided according to Scheme 1 and Scheme 2 of the utility model.

[0052] The SW board described in the utility model has a panel puller, which is convenient for disassembly and assembly. The integrated circuit saves the production cost of the circuit board, is beneficial to the circuit wiring, and improves the reliability. The SW board can acquire the status information of the turnout in real time by collecting the current of the switch machine, monitor and control the turnout status, and realize the collection, conditioning and processing functions of the microcomputer monitoring system for the field signal. The turnout module is designed according to the safety technologies such as closed-loop control, anti-interference protection, dual verification of hardware and software, and double disconnection of the control circuit, which complies with the fault safety principle, ensuring that in the event of a fault or abnormal situation, it will not affect the safe operation of the train or vehicle, ensuring the safety of the system and improving the reliability of the system.

[0053] In the embodiment of the utility model, the SW board can monitor the status information of the turnout in real time, including the positioning and reverse position of the turnout, and can indicate it through indicator lights, effectively preventing the occurrence of railway accidents and improving the safety of railway transportation; the SW board adds a power reverse connection protection function, and the module will not be damaged when the power supply is reversed, ensuring the safety of the system. The SW board adds operational amplifier / optocoupler device acquisition, which can avoid the influence of interference signals and has high accuracy.

[0054] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A SW board, characterized in that: include: CPU module, internal connector, relay control circuit, safety output circuit, turnout current sensing circuit and turnout status indication circuit, wherein the safety output circuit is respectively connected with the turnout current sensing circuit, the turnout status indication circuit and the relay control circuit, the internal connector is respectively connected with the turnout current sensing circuit, the turnout status indication circuit, the relay control circuit and the CPU module, and the safety output circuit is connected with the external connector; The CPU module includes a dual CPU chip structure, which is used to control the safety output circuit through the relay control circuit to supply power to the switch machine; The turnout current sensing circuit is used to convert the collected current signal into a voltage signal and send the voltage signal to the CPU module; The turnout state indicating circuit is used to collect the state voltage signal of the switch machine and send the state voltage signal to the full electronic computer interlocking system through the CPU module, wherein the state voltage signal is used to indicate whether the switch machine is rotating forward or reverse.

2. The SW board according to claim 1, characterized in that: The two SW boards are connected in parallel on the same external connector, and the two SW boards are connected via CAN communication.

3. The SW board according to claim 1, characterized in that The turnout current sensing circuit includes: a current sensor and a first operational amplifier, wherein the model of the current sensor is DLT6.25A, and the model of the first operational amplifier is LM324.

4. The SW board according to claim 1, characterized in that: The turnout current sensing circuit comprises: a current transformer and a second operational amplifier, wherein the model of the current transformer is TA1013-3Z, and the model of the second operational amplifier is LM2904BQDRQ1.

5. The SW board according to claim 3, characterized in that: The switch state indicating circuit comprises: a DC-DC power supply chip and an optical coupler, wherein the model of the DC-DC power supply chip is RS-2405S / H3, and the model of the optical coupler is TLP127.

6. The SW board according to claim 4, characterized in that: The switch state indicating circuit comprises: a third operational amplifier, wherein the model of the third operational amplifier is LM2904BQDRQ1.

7. The SW board according to claim 1, characterized in that: The relay control circuit comprises: an NMOS tube, a first PMOS tube and an indicator light, wherein the model of the NMOS tube is BSS138P,215, and the model of the PMOS tube is BSS84AK,215.

8. The SW board according to claim 1, characterized in that: The safety output circuit includes: a safety relay, wherein the model of the safety relay is HOZ-462-1529.

9. The SW board according to claim 1, characterized in that: The SW board also includes: a power supply circuit, wherein the power supply circuit includes a power supply block, a DC-DC converter module and a second PMOS tube, the model of the power supply block is MJWI20-24D12, and the model of the second PMOS tube is SPD30P06PG.

10. A fully electronic computer interlocking system, characterized in that: A SW board comprising the SW board described in any one of claims 1 to 9.

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