CN219487452U - Digital input channel diagnostic device and train control and management system - Google Patents
Digital input channel diagnostic device and train control and management system Download PDFInfo
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- CN219487452U CN219487452U CN202320387325.4U CN202320387325U CN219487452U CN 219487452 U CN219487452 U CN 219487452U CN 202320387325 U CN202320387325 U CN 202320387325U CN 219487452 U CN219487452 U CN 219487452U
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Abstract
The utility model discloses a digital input channel diagnosis device and a train control and management system, wherein the digital input channel diagnosis device comprises an input channel circuit, a power supply control circuit, a grounding control circuit and a controller, wherein the power supply control circuit and the grounding control circuit are respectively connected with a power supply control end and a grounding control end of the input channel circuit, the power supply control circuit and the grounding control circuit are controlled by the controller so as to carry out power supply and grounding control on the power supply control end and the grounding control end of the input channel circuit, and channel fault diagnosis is carried out on sampling values of signals to be acquired according to the input channel circuit. Therefore, the utility model can diagnose the on-off and faults of the digital input channel in real time so as to improve the stability and reliability of the digital input channel and meet the requirements of a train function safety control system.
Description
Technical Field
The utility model relates to the technical field of train detection, in particular to a digital input channel diagnosis device and a train control and management system.
Background
In the functional safety control system of the train, whether the digital quantity input signal is correctly acquired is directly related to subsequent operation and output, so that the digital input channel has higher requirements on stability and reliability.
In the related art, only one channel is added for redundancy in the process of collecting input data, but only one channel redundancy is carried out, so that the requirements of a train function safety control system cannot be met, and diagnosis of signal faults cannot be carried out.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present utility model is to provide a digital input channel diagnostic device, which can diagnose the on-off and faults of the digital input channel in real time, so as to improve the stability and reliability of the digital input channel and meet the requirements of a train function safety control system.
A second object of the present utility model is to propose a train control and management system.
To achieve the above object, an embodiment of a first aspect of the present utility model provides a digital input channel diagnostic device, which includes an input channel circuit, a power supply control circuit, a ground control circuit, and a controller, where an input end of the input channel circuit is adapted to access a signal to be collected, the power supply control end of the input channel circuit is connected to the power supply control circuit, the ground control end of the input channel circuit is connected to the ground control circuit, an output end of the input channel circuit is connected to a sampling end of the controller, and the controller is configured to control the power supply control circuit to provide a sampling power supply to the input channel circuit, and control the ground control circuit to provide a sampling ground to the input channel circuit, and perform channel fault diagnosis on a sampling value of the signal to be collected according to the input channel circuit when the power supply control circuit provides the sampling power supply and/or the ground control circuit provides the sampling ground to the input channel circuit.
The digital input channel diagnosis device in the example comprises an input channel circuit, a power supply control circuit, a grounding control circuit and a controller, wherein the power supply control circuit and the grounding control circuit are respectively connected with a power supply control end and a grounding control end of the input channel circuit, the power supply control circuit and the grounding control circuit are controlled by the controller so as to supply power to and control the grounding control end of the input channel circuit, and channel fault diagnosis is carried out on sampling values of signals to be acquired according to the input channel circuit. Therefore, the utility model can diagnose the on-off and faults of the digital input channel in real time so as to improve the stability and reliability of the digital input channel and meet the requirements of a train function safety control system.
In some examples of the utility model, the power supply control circuit includes: the first end of the first switching tube is connected to the sampling power supply, and the second end of the first switching tube is connected with the power supply control end of the input channel circuit; the output end of the first driving unit is connected with the control end of the first switching tube, the input end of the first driving unit is connected with the controller, and the first driving unit is configured to drive the first switching tube to be turned on or turned off according to a first control signal output by the controller.
In some examples of the utility model, the first driving unit is a first optocoupler isolation driving circuit.
In some examples of the utility model, the first optocoupler isolation drive circuit includes: the first resistor is connected between the first end and the control end of the first switching tube; the cathode of the first voltage stabilizing tube is connected with the first end of the first switching tube; the first isolation optocoupler is connected with the control end of the first switch tube, the second pin of the first isolation optocoupler is connected with the anode of the first voltage stabilizing tube, and the third pin of the first isolation optocoupler is connected to a reference power supply through a second resistor; the first end of the second switching tube is connected with a fourth tube leg of the first isolation optocoupler, the second end of the second switching tube is connected to the reference ground, and the control end of the second switching tube is connected to the first control output end of the controller through a third resistor; and one end of the fourth resistor is connected with the anode of the first voltage stabilizing tube, and the other end of the fourth resistor is connected to the sampling ground.
In some examples of the utility model, the first optocoupler isolation drive circuit further includes: one end of the first capacitor is connected with the first end of the second switch tube; one end of the second capacitor is connected with the other end of the first capacitor, and the other end of the second capacitor is connected with the second end of the second switch tube; one end of the fifth resistor is connected with the other end of the first capacitor and one end of the second capacitor respectively; and the anode of the second diode is connected with the other end of the fifth resistor, and the cathode of the second diode is connected to the first control output end of the controller.
In some examples of the utility model, the ground control circuit includes: the first end of the third switching tube is connected with the grounding control end of the input channel circuit, and the second end of the third switching tube is connected to the sampling ground; the output end of the second driving unit is connected with the control end of the third switching tube, the input end of the second driving unit is connected with the controller, and the second driving unit is configured to drive the third switching tube to be turned on or turned off according to a second control signal output by the controller.
In some examples of the present utility model, the second driving unit is a second optocoupler isolation driving circuit.
In some examples of the utility model, the second optocoupler isolation drive circuit includes: the first pin of the second isolation optocoupler is connected to the sampling power supply through a sixth resistor, the second pin of the second isolation optocoupler is connected with the control end of the third switching tube, and the third pin of the second isolation optocoupler is connected to the reference power supply through a seventh resistor; the first end of the fourth switching tube is connected with a fourth tube pin of the second isolation optocoupler, the second end of the fourth switching tube is connected to the reference ground, and the control end of the fourth switching tube is connected to the second control output end of the controller through an eighth resistor; a ninth resistor connected between the second end and the control end of the third switching tube; the anode of the second voltage stabilizing tube is connected with the second end of the third switch tube, and the cathode of the second voltage stabilizing tube is connected with the first pin of the second isolation optocoupler.
In some examples of the utility model, the second optocoupler isolation driving circuit further includes: one end of the third capacitor is connected with the first end of the fourth switching tube; one end of the fourth capacitor is connected with the other end of the third capacitor, and the other end of the fourth capacitor is connected with the second end of the fourth switch tube; one end of the tenth resistor is connected with the other end of the third capacitor and one end of the fourth capacitor respectively; and the anode of the fourth diode is connected with the other end of the tenth resistor, and the cathode of the fourth diode is connected to the second control output end of the controller.
In some examples of the utility model, the input channel circuit includes: a fifth diode, wherein the anode of the fifth diode is used as a power supply control end of the input channel circuit; a sixth diode, the cathode of the sixth diode being connected to the cathode of the fifth diode and having a first node; a seventh diode, wherein the cathode of the seventh diode is connected with the ground control end of the input channel circuit; an eighth diode, wherein the anode of the eighth diode is connected with the anode of the seventh diode and is provided with a second node, the cathode of the eighth diode is connected with the anode of the sixth diode and is provided with a third node, and the third node is used as the input end of the input channel circuit; the anode of the third voltage stabilizing tube is connected to the sampling ground, and the cathode of the third voltage stabilizing tube is connected with the third node; the third pin of the third isolation optocoupler is connected to the first node through an eleventh resistor, the first pin of the third isolation optocoupler is connected to a reference power supply through a twelfth resistor and is connected with the sampling end of the controller, the second pin of the third isolation optocoupler is connected to the reference ground, and the fourth pin of the third isolation optocoupler is connected to the second node through a thirteenth resistor.
To achieve the above object, a second aspect of the present utility model provides a train control and management system including the digital input channel diagnostic device in the above example.
The train control and management system in the example can diagnose the on-off and faults of the digital input channel in real time through the digital input channel diagnosis device in the example so as to improve the stability and reliability of the digital input channel and meet the requirements of the train function safety control system.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a block diagram of a digital input channel diagnostic device according to one embodiment of the present utility model;
FIG. 2 is a schematic diagram of a power control circuit in accordance with one embodiment of the present utility model;
FIG. 3 is a schematic diagram of a ground control circuit in accordance with one embodiment of the utility model;
FIG. 4 is a schematic diagram of an input channel circuit in accordance with one embodiment of the utility model;
FIG. 5 is a schematic diagram of a sampled signal in accordance with one embodiment of the utility model;
fig. 6 is a block diagram of a train control and management system according to an embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
The digital input channel diagnostic device and the train control and management system according to the embodiment of the present utility model are described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a digital input channel diagnostic device according to one embodiment of the present utility model.
As shown in fig. 1, the present utility model proposes a digital input channel diagnostic device 10, the digital input channel diagnostic device 10 including an input channel circuit 11, a power supply control circuit 12, a ground control circuit 13, and a controller 14.
The input end of the input channel circuit 11 is suitable for accessing a signal to be collected, the power supply control end of the input channel circuit 11 is connected with the power supply control circuit 12, the ground control end of the input channel circuit 11 is connected with the ground control circuit 13, the output end of the input channel circuit 11 is connected with the sampling end of the controller 14, the controller 14 is configured to control the power supply control circuit 12 to provide a sampling power supply to the input channel circuit 11 and control the ground control circuit 13 to provide a sampling ground to the input channel circuit 11, and channel fault diagnosis is performed according to a sampling value of the signal to be collected when the power supply control circuit 12 provides the sampling power supply to the input channel circuit 11 and/or the ground control circuit 13 provides the sampling ground to the input channel circuit 11.
Specifically, referring to fig. 1, the input channel circuit 11 is connected to the sampling power supply through the power supply control circuit 12, the controller 14 is connected to the power supply control circuit 12, and the controller 14 can control the power supply control circuit 12 so that the sampling power supply supplies power to the input channel circuit 11 or disconnects the sampling power supply from the input channel circuit 11. The input channel circuit 11 is connected to the sampling ground through a ground control circuit 13, and the controller 14 is also connected to the ground control circuit 13, and the controller 14 can control the ground control circuit 13 to supply the sampling ground to the input channel circuit 11 or disconnect the input channel circuit 11 from the sampling ground.
In this embodiment, the input end of the input channel circuit 11 is connected with a signal to be collected, the controller 14 is further connected with the input channel circuit 11, when the controller 14 controls the power supply control circuit 12 and/or the ground control circuit 13, a sampling value corresponding to the signal to be collected, which is connected with the input end of the input channel circuit 11, is replaced, and then the power supply control circuit 12 and/or the ground control circuit 13 can be controlled by the controller 14, and the sampling value of the signal to be collected is detected, and then channel fault diagnosis is performed according to the sampling value of the signal to be collected. It may be appreciated that the sampling value and the channel fault have a corresponding relationship, and the corresponding relationship between the fault of the digital input channel and the sampling value can be counted in advance before the input channel is diagnosed, and the counted result is stored in the memory of the controller 14 in advance, and after the controller 14 collects the sampling value, the counted result is queried to determine the fault of the digital input channel, so that a maintainer or the controller 14 can maintain the digital input channel in time.
In some embodiments of the present utility model, as shown in fig. 2, the power supply control circuit includes a first switching tube Q1 and a first driving unit 121.
Wherein, the first end of the first switching tube is connected to the sampling power VCC, the second end of the first switching tube is connected with the power supply control end PPS of the input channel circuit; the output end of the first driving unit is connected with the control end of the first switching tube, the input end of the first driving unit is connected with the controller, and the first driving unit 121 is configured to drive the first switching tube Q1 to be turned on or turned off according to a first control signal output by the controller.
Specifically, referring to fig. 2, PPS is a power supply control end of the input channel circuit, PULS1 is a signal receiving end connected to the controller, and is capable of receiving a first control signal sent by the controller, and further controlling the first switching tube Q1 through the first driving unit 121, so that the first switching tube Q1 can act, and further perform power supply control on the power supply control end PPS of the input channel circuit, so as to complete power supply control of the controller on the input channel circuit. In this embodiment, the first end of the first switching tube Q1 is connected to the sampling power VCC, and when the first switching tube Q1 is turned on, the sampling power VCC can supply power to the power supply control end PPS of the input channel circuit through the first switching tube Q1, and of course, when the first switching tube Q1 is turned off, the sampling power VCC cannot supply power to the power supply control end PPS of the input channel circuit.
In some embodiments, as shown in fig. 2, the first driving unit 121 is a first optocoupler isolation driving circuit.
Specifically, the first driving circuit 121 is set as an optocoupler isolation driving circuit, so that the input signal can be prevented from being interfered, and the control precision can be improved.
In some examples, the first optocoupler isolation driving circuit includes a first resistor R1, a first voltage regulator tube D1, a first isolation optocoupler H1, a second switching tube Q2, a fourth resistor R4, and a third resistor R3.
The first resistor R1 is connected between the first end and the control end of the first switching tube Q1; the cathode of the first voltage stabilizing tube D1 is connected with the first end of the first switching tube Q1; a first pin of the first isolation optocoupler H1 is connected with a control end of the first switching tube Q1, a second pin of the first isolation optocoupler H1 is connected with an anode of the first voltage stabilizing tube D1, and a third pin of the first isolation optocoupler H1 is connected to a reference power supply VCC through a second resistor R2; the first end of the second switching tube Q2 is connected with a fourth tube pin of the first isolation optocoupler H1, the second end of the second switching tube Q2 is connected to the reference ground, and the control end of the second switching tube Q2 is connected to the first control output end of the controller through a third resistor R3; one end of the fourth resistor R4 is connected with the anode of the first voltage stabilizing tube D1, and the other end of the fourth resistor R4 is connected to the sampling ground.
Specifically, the first optocoupler isolation driving circuit uses the first isolation optocoupler H1 as a control device to control on-off of the first switching tube Q1 through control of the first isolation optocoupler H1. More specifically, the first pin of the first isolation optocoupler H1 is connected to the control end of the first switching tube Q1, when the first isolation optocoupler H1 is turned on, the first switching tube Q1 can be controlled to be turned on, and then the first end and the second end of the first switching tube Q1 are turned on, so that the sampling power VCC connected to the first switching tube Q1 can supply power to the input channel circuit through the first switching tube Q1. And the second pin of first isolation opto-coupler H1 still links to each other with the positive pole of first voltage-regulator tube D1, and the negative pole of first voltage-regulator tube D1 is connected with sampling power VCC, and first voltage-regulator tube D1 can keep sampling power VCC's output stable, prevents when supply voltage fluctuates, causes the damage of components and parts in the power supply control circuit.
Further, the first optocoupler isolation driving circuit further includes a first capacitor C1, a second capacitor C2, a fifth resistor R5, and a second diode D2.
One end of the first capacitor C1 is connected with the first end of the second switching tube Q2; one end of the second capacitor C2 is connected with the other end of the first capacitor C1, and the other end of the second capacitor C2 is connected with the second end of the second switching tube Q2; one end of the fifth resistor R5 is respectively connected with the other end of the first capacitor C1 and one end of the second capacitor C2; an anode of the second diode D2 is connected to the other end of the fifth resistor R5, and a cathode of the second diode D2 is connected to the first control output terminal of the controller.
Specifically, the first optocoupler isolation driving circuit is further provided with a first capacitor C1 and a second capacitor C2, and the first capacitor C1 and the second capacitor C2 serve as decoupling capacitors, so that interference of external signals can be reduced, and the control accuracy of the controller on the power supply control circuit is improved. More specifically, the first control output end of the controller is connected to the PULS1 end in the first optocoupler isolation driving circuit, the controller enters a control signal into the first driving unit 121 through the PULS1 end, the first driving unit 121 controls the second switching tube Q2 according to the control signal, so that the second switching tube Q2 is turned on, and the first isolation optocoupler H1 can respond to control the first switching tube Q1 to be turned on, so that the sampling power VCC can provide the sampling power to the input channel circuit through the first switching tube Q1.
Optionally, in this embodiment, the resistance of the second resistor R2 is 1K, the resistances of the third resistor R3 and the fifth resistor R5 are both 10K, the capacitance of the first capacitor C1 is 1nF, and the capacitance of the second capacitor C2 is 3.3nF, which should be noted that specific values of the devices such as the resistor and the capacitor in this embodiment may be set according to actual requirements, and are not limited herein.
In some embodiments of the present utility model, as shown in fig. 3, the ground control circuit includes a third switching tube Q3 and a second driving unit 131.
The first end of the third switching tube Q3 is connected with the grounding control end of the input channel circuit, and the second end of the third switching tube Q3 is connected to the sampling ground; the output end of the second driving unit 131 is connected to the control end of the third switching tube, the input end of the second driving unit 131 is connected to the controller, and the second driving unit 131 is configured to drive the third switching tube Q3 to be turned on or off according to the second control signal output by the controller.
Specifically, as shown in fig. 3, the NPS is a ground control end of the input channel circuit, the PULS0 is a signal receiving end connected to the controller, and is capable of receiving a second control signal sent by the controller, and further controlling the third switching tube Q3 through the second driving unit 131, so that the third switching tube Q3 can act, and further ground control is performed on the ground control end NPS of the input channel circuit, so as to complete the ground control of the controller on the input channel circuit. In this embodiment, the second end of the third switching tube Q3 is connected to the sampling ground, and when the third switching tube Q3 is turned on, the sampling ground can be connected to the ground control end NPS of the input channel circuit through the third switching tube Q3, and of course, when the third switching tube Q3 is turned off, the sampling ground is disconnected from the power supply control end NPS of the input channel circuit.
In some embodiments, as shown in fig. 3, the second driving unit 131 is a second optocoupler isolation driving circuit.
Specifically, the second driving circuit 131 is set as an optocoupler isolation driving circuit, so that the input signal is prevented from being interfered, and the control precision is improved.
In some examples, the second optocoupler isolation driving circuit includes a second isolation optocoupler H2, a fourth switching tube Q4, an eighth resistor R8, a ninth resistor R9, and a second voltage regulator tube D3.
The first pin of the second isolation optocoupler H2 is connected to a sampling power supply through a sixth resistor, the second pin of the second isolation optocoupler H2 is connected with the control end of the third switching tube Q3, and the third pin of the second isolation optocoupler H2 is connected to a reference power supply through a seventh resistor R7; the first end of the fourth switching tube Q4 is connected with a fourth tube pin of the second isolation optocoupler H2, the second end of the fourth switching tube Q4 is connected to the reference ground, and the control end of the fourth switching tube Q4 is connected to the second control output end of the controller through an eighth resistor R8; the ninth resistor R9 is connected between the second end and the control end of the third switching tube Q3; the anode of the second voltage stabilizing tube D3 is connected with the second end of the third switching tube Q3, and the cathode of the second voltage stabilizing tube D3 is connected with the first pin of the second isolation optocoupler H2.
Specifically, the second optocoupler isolation driving circuit uses the second isolation optocoupler H2 as a control device to control on-off of the third switching tube Q3 through control of the second isolation optocoupler H2. More specifically, the second pin of the second isolation optocoupler H2 is connected to the control end of the third switching tube Q3, and when the second isolation optocoupler H2 is turned on, the third switching tube Q3 can be controlled to be turned on, and then the first end and the second end of the third switching tube Q3 are turned on, so that the sampling ground connected to the third switching tube Q3 can be connected to the ground end of the input channel circuit through the third switching tube Q3. And the first pin of the second isolation optocoupler H2 is also connected with the cathode of the second voltage stabilizing tube D3, the anode of the second voltage stabilizing tube D3 is connected with the second end of the third switching tube Q3, the anode of the second voltage stabilizing tube D3 is also connected with a sampling ground, the second voltage stabilizing tube D3 can keep the output stability of the sampling power supply VCC, and the damage of components in a grounding control circuit caused by the fluctuation of the power supply voltage is prevented.
Further, the second optocoupler isolation driving circuit further includes a third capacitor C3, a fourth capacitor C4, a tenth resistor R10, and a fourth diode D4.
One end of the third capacitor C3 is connected with the first end of the fourth switching tube Q4; one end of the fourth capacitor C4 is connected with the other end of the third capacitor C3, and the other end of the fourth capacitor C4 is connected with the second end of the fourth switching tube Q4; one end of the tenth resistor R10 is respectively connected with the other end of the third capacitor C3 and one end of the fourth capacitor C4; an anode of the fourth diode D4 is connected to the other end of the tenth resistor R10, and a cathode of the fourth diode D4 is connected to the second control output terminal of the controller.
Specifically, the second optocoupler isolation driving circuit is further provided with a third capacitor C3 and a fourth capacitor C4, and the third capacitor C3 and the fourth capacitor C4 serve as decoupling capacitors, so that interference of external signals can be reduced, and the control accuracy of the controller to the ground control circuit is improved. More specifically, the second control output end of the controller is connected to the PULS0 end in the second optocoupler isolation driving circuit, the controller enters a control signal into the second driving unit 131 through the PULS0 end, the second driving unit 131 controls the fourth switching tube Q4 according to the control signal, so that the fourth switching tube Q4 is turned on, and the second isolation optocoupler H2 can respond to control the third switching tube Q3 to be turned on, so that the sampling ground can be provided to the input channel circuit through the third switching tube Q3.
Optionally, in this embodiment, the resistance of the seventh resistor R7 is 1K, the resistances of the eighth resistor R8 and the tenth resistor R10 are both 10K, the capacitance of the third capacitor C3 is 1nF, and the capacitance of the fourth capacitor C4 is 3.3nF, which should be noted that the specific values of the devices such as the resistor and the capacitor in this embodiment may be set according to the actual needs, and are not limited herein specifically.
In one embodiment of the present utility model, as shown in fig. 4, the input channel circuit includes a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a third regulator D9, and a third isolation optocoupler H3.
The anode of the fifth diode D5 is used as a power supply control end of the input channel circuit; the cathode of the sixth diode D6 is connected to the cathode of the fifth diode D5 and has a first node P1; the cathode of the seventh diode D7 is connected with the ground control end of the input channel circuit; the anode of the eighth diode D8 is connected with the anode of the seventh diode D7 and has a second node P2, the cathode of the eighth diode D8 is connected with the anode of the sixth diode D6 and has a third node P3, and the third node P3 is used as the input end of the input channel circuit; the anode of the third voltage stabilizing tube D9 is connected to the sampling ground, and the cathode of the third voltage stabilizing tube D9 is connected with the third node 3; the third pin of the third isolation optocoupler H3 is connected to the first node P1 through an eleventh resistor R11, the first pin of the third isolation optocoupler H3 is connected to a reference power supply through a twelfth resistor R12 and is connected to the sampling end of the controller, the second pin of the third isolation optocoupler H3 is connected to the reference ground, and the fourth pin of the third isolation optocoupler H3 is connected to the second node P2 through a thirteenth resistor R13.
Specifically, referring to fig. 2, 3 and 4, it should be noted that the same reference numerals in the figures are connected together, for example, the PPS terminal in fig. 4 is connected to the PPS terminal in fig. 2, and the NPS terminal in fig. 4 is connected to the NPS terminal in fig. 3, so that the power supply control circuit can perform power supply control to the input channel circuit through the PPS terminal, and the ground control circuit can perform ground control to the input channel circuit through the NPS terminal.
The input end IN_n of the input channel circuit is connected with a signal to be sampled, and when different signals are input at the power supply end and the grounding end of the input channel circuit, the output end GPIO of the input channel circuit can output different signals.
2-4, assuming that the signal to be collected is 24V, when the third switching tube Q3 in the grounding control circuit is conducted, the NPS end is conducted, and current sequentially passes through the sixth diode D6, the third isolation optocoupler H3 and the seventh diode D7 and then flows into the grounding end of the input channel circuit, wherein the third isolation optocoupler H3 acts, and the signal collected by the sampling end of the controller is logic '1'; assuming that the signal to be collected is 0V, when a third switching tube Q3 in the grounding control circuit is conducted, the NPS end is conducted, no current flows through a third isolation optocoupler H3, the third isolation optocoupler H3 acts, and then the signal collected by a sampling end of the controller is logic 0; assuming that the signal to be acquired is 0V, when a first switching tube Q1 in a power supply control circuit is conducted, a PPS end is conducted, current sequentially passes through a fifth diode D5, a third isolation optocoupler H3 and an eighth diode D8 and then flows into a grounding end of an input channel circuit, wherein the third isolation optocoupler H3 acts, and then the signal acquired by a sampling end of a controller is logic '1'; assuming that an external signal to be acquired is 24V, when a first switching tube Q1 in a power supply control circuit is conducted, a PPS end is conducted, no current flows through a third isolation optocoupler H3, the third isolation optocoupler H3 acts, and then the signal acquired by a sampling end of a controller is logic '0'; assuming that the signal to be collected is 24V, when a first switching tube Q1 in the power supply control circuit and a third switching tube Q3 in the grounding control circuit are conducted, a PPS end and an NPS end are both conducted, current flows through a fifth diode D5, a sixth diode D6, a third isolation optocoupler H3 and a seventh diode D7, then flows into the grounding end of the input channel circuit, wherein the third isolation optocoupler H3 acts, and the signal collected by the sampling end of the controller is logic '1'; assuming that the signal to be collected is 0V, when the first switching tube Q1 in the power supply control circuit and the third switching tube Q3 in the ground control circuit are turned on, the PPS end and the NPS end are both turned on, and the current flows through the fifth diode D5, the third isolated optocoupler H3, the seventh diode D7 and the eighth diode D8, and then flows into the ground end of the input channel circuit, wherein the third isolated optocoupler H3 acts, and the signal collected by the sampling end of the controller is logic "1".
It should be noted that, in the above example, the controller may determine the state of the input channel circuit according to the sampling result, and further determine whether the input channel circuit has information such as hardware failure according to the state. More specifically, in order to improve the accuracy of the diagnosis result, the controller in this embodiment may perform sampling multiple times, so as to determine the fault information existing in the input channel circuit more accurately according to the sampling value.
In a specific example, in the process of sampling three times, the controller in this embodiment may provide different control signals to the power supply control circuit and the ground control circuit, so as to determine a specific fault of the input channel circuit according to analysis of sampled values of the different control signals. As shown in fig. 5, the first signal diagram is a sampling time signal, eighteen milliseconds are used as sampling time in each second, and the eighteen milliseconds are divided into three times for sampling, so as to obtain three sampling values, and according to the combination result of the three sampling values, the level data of the input end in different input channel circuits and the self-circuit state of the input channel circuit are corresponding, in the control signal shown in fig. 5, the input channel circuit state corresponding to the sampling values is shown in table 1:
TABLE 1
In summary, the embodiment of the utility model controls the power supply control circuit and the grounding control circuit through the controller, thereby realizing the power supply and grounding control of the input channel circuit, simultaneously the controller samples the sampling end of the input channel circuit, and then finds specific fault information according to the sampling value, thereby carrying out real-time diagnosis on the on-off and faults of the digital input channel, improving the stability and the reliability of the digital input channel and meeting the requirements of a train function safety control system.
Fig. 6 is a block diagram of a train control and management system according to an embodiment of the present utility model.
Further, as shown in fig. 6, the train control and management system 100 in this embodiment includes the digital input channel diagnostic device 10 in the above embodiment, and by using the digital input channel diagnostic device 10 in the above embodiment, on-off and faults of the digital input channel can be diagnosed in real time, so as to improve stability and reliability of the digital input channel, and meet requirements of the train function safety control system.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, as used in embodiments of the present utility model, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying any particular number of features in the present embodiment. Thus, a feature of an embodiment of the utility model that is defined by terms such as "first," "second," etc., may explicitly or implicitly indicate that at least one such feature is included in the embodiment. In the description of the present utility model, the word "plurality" means at least two or more, for example, two, three, four, etc., unless explicitly defined otherwise in the embodiments.
In the present utility model, unless explicitly stated or limited otherwise in the examples, the terms "mounted," "connected," and "fixed" as used in the examples should be interpreted broadly, e.g., the connection may be a fixed connection, may be a removable connection, or may be integral, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, it may be directly connected, or indirectly connected through an intermediate medium, or may be in communication with each other, or in interaction with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to specific embodiments.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (11)
1. A digital input channel diagnostic device, comprising: the input end of the input channel circuit is suitable for being connected with a signal to be acquired, the power supply control end of the input channel circuit is connected with the power supply control circuit, the ground control end of the input channel circuit is connected with the ground control circuit, the output end of the input channel circuit is connected with the sampling end of the controller, the controller is configured to control the power supply control circuit to provide a sampling power supply for the input channel circuit and control the ground control circuit to provide a sampling ground for the input channel circuit, and channel fault diagnosis is carried out on a sampling value of the signal to be acquired according to the input channel circuit when the power supply control circuit provides the sampling power supply for the input channel circuit and/or the ground control circuit provides the sampling ground for the input channel circuit.
2. The digital input channel diagnostic device of claim 1, wherein the power supply control circuit comprises:
the first end of the first switching tube is connected to the sampling power supply, and the second end of the first switching tube is connected with the power supply control end of the input channel circuit;
the output end of the first driving unit is connected with the control end of the first switching tube, the input end of the first driving unit is connected with the controller, and the first driving unit is configured to drive the first switching tube to be turned on or turned off according to a first control signal output by the controller.
3. The digital input channel diagnostic device of claim 2, wherein the first drive unit is a first optocoupler isolation drive circuit.
4. The digital input channel diagnostic device of claim 3, wherein the first optocoupler isolation drive circuit comprises:
the first resistor is connected between the first end and the control end of the first switching tube;
the cathode of the first voltage stabilizing tube is connected with the first end of the first switching tube;
the first isolation optocoupler is connected with the control end of the first switch tube, the second pin of the first isolation optocoupler is connected with the anode of the first voltage stabilizing tube, and the third pin of the first isolation optocoupler is connected to a reference power supply through a second resistor;
the first end of the second switching tube is connected with a fourth tube leg of the first isolation optocoupler, the second end of the second switching tube is connected to the reference ground, and the control end of the second switching tube is connected to the first control output end of the controller through a third resistor;
and one end of the fourth resistor is connected with the anode of the first voltage stabilizing tube, and the other end of the fourth resistor is connected to the sampling ground.
5. The digital input channel diagnostic device of claim 4, wherein the first optocoupler isolation drive circuit further comprises:
one end of the first capacitor is connected with the first end of the second switch tube;
one end of the second capacitor is connected with the other end of the first capacitor, and the other end of the second capacitor is connected with the second end of the second switch tube;
one end of the fifth resistor is connected with the other end of the first capacitor and one end of the second capacitor respectively;
and the anode of the second diode is connected with the other end of the fifth resistor, and the cathode of the second diode is connected to the first control output end of the controller.
6. The digital input channel diagnostic device of claim 1, wherein the ground control circuit comprises:
the first end of the third switching tube is connected with the grounding control end of the input channel circuit, and the second end of the third switching tube is connected to the sampling ground;
the output end of the second driving unit is connected with the control end of the third switching tube, the input end of the second driving unit is connected with the controller, and the second driving unit is configured to drive the third switching tube to be turned on or turned off according to a second control signal output by the controller.
7. The digital input channel diagnostic device of claim 6, wherein the second drive unit is a second optocoupler isolation drive circuit.
8. The digital input channel diagnostic device of claim 7, wherein the second optocoupler isolation drive circuit comprises:
the first pin of the second isolation optocoupler is connected to the sampling power supply through a sixth resistor, the second pin of the second isolation optocoupler is connected with the control end of the third switching tube, and the third pin of the second isolation optocoupler is connected to the reference power supply through a seventh resistor;
the first end of the fourth switching tube is connected with a fourth tube pin of the second isolation optocoupler, the second end of the fourth switching tube is connected to the reference ground, and the control end of the fourth switching tube is connected to the second control output end of the controller through an eighth resistor;
a ninth resistor connected between the second end and the control end of the third switching tube;
the anode of the second voltage stabilizing tube is connected with the second end of the third switch tube, and the cathode of the second voltage stabilizing tube is connected with the first pin of the second isolation optocoupler.
9. The digital input channel diagnostic device of claim 8, wherein the second optocoupler isolation drive circuit further comprises:
one end of the third capacitor is connected with the first end of the fourth switching tube;
one end of the fourth capacitor is connected with the other end of the third capacitor, and the other end of the fourth capacitor is connected with the second end of the fourth switch tube;
one end of the tenth resistor is connected with the other end of the third capacitor and one end of the fourth capacitor respectively;
and the anode of the fourth diode is connected with the other end of the tenth resistor, and the cathode of the fourth diode is connected to the second control output end of the controller.
10. The digital input channel diagnostic device of any one of claims 1-9, wherein the input channel circuit comprises:
a fifth diode, wherein the anode of the fifth diode is used as a power supply control end of the input channel circuit;
a sixth diode, the cathode of the sixth diode being connected to the cathode of the fifth diode and having a first node;
a seventh diode, wherein the cathode of the seventh diode is connected with the ground control end of the input channel circuit;
an eighth diode, wherein the anode of the eighth diode is connected with the anode of the seventh diode and is provided with a second node, the cathode of the eighth diode is connected with the anode of the sixth diode and is provided with a third node, and the third node is used as the input end of the input channel circuit;
the anode of the third voltage stabilizing tube is connected to the sampling ground, and the cathode of the third voltage stabilizing tube is connected with the third node;
the third pin of the third isolation optocoupler is connected to the first node through an eleventh resistor, the first pin of the third isolation optocoupler is connected to a reference power supply through a twelfth resistor and is connected with the sampling end of the controller, the second pin of the third isolation optocoupler is connected to the reference ground, and the fourth pin of the third isolation optocoupler is connected to the second node through a thirteenth resistor.
11. A train control and management system comprising a digital input channel diagnostic device according to any one of claims 1-10.
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| CN202320387325.4U CN219487452U (en) | 2023-02-23 | 2023-02-23 | Digital input channel diagnostic device and train control and management system |
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| CN202320387325.4U CN219487452U (en) | 2023-02-23 | 2023-02-23 | Digital input channel diagnostic device and train control and management system |
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