CN112098887A - Rail transit dry contact point state judgment system and method - Google Patents
Rail transit dry contact point state judgment system and method Download PDFInfo
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- CN112098887A CN112098887A CN202010827918.9A CN202010827918A CN112098887A CN 112098887 A CN112098887 A CN 112098887A CN 202010827918 A CN202010827918 A CN 202010827918A CN 112098887 A CN112098887 A CN 112098887A
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- 238000004590 computer program Methods 0.000 description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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Abstract
The embodiment of the invention provides a rail transit trunk junction state judgment system and a rail transit trunk junction state judgment method. The system comprises: a control circuit; the signal excitation circuit is connected with the control circuit and used for sending an excitation signal under the control of the control circuit; the dry contact point circuit is connected with the signal excitation circuit; the current acquisition circuit is connected with the dry contact circuit and used for receiving the feedback current of the excitation signal after passing through the dry contact circuit; the control circuit is further connected with the current acquisition circuit and used for judging the state of the dry contact in the dry contact circuit according to the feedback current. The rail transit dry contact point state judgment system and method provided by the embodiment of the invention can accurately identify the state of the dry contact point, so that misjudgment caused by the fact that the judgment of the dry contact point state needs to depend on an optical coupler in the prior art is avoided.
Description
Technical Field
The invention relates to the technical field of rail transit fault detection, in particular to a rail transit dry junction state judgment system and a rail transit dry junction state judgment method.
Background
In rail transit, a dry contact circuit is a commonly used input circuit form, and is used for collecting contact on-off states of various relays, for example. However, the on-off of the dry contact is the same as the on-off of the cable, so that the common acquisition circuit cannot realize distinction and identification.
At present, in rail transit, a dry contact acquisition circuit for non-functional safety is shown in fig. 1:
the power supply is output from the acquisition equipment side, and after passing through a dry contact, the power supply is input into the optocoupler PS2561 from IN1 '(IN 2') through a diode D101 '(D102'), a voltage regulator tube Z101 '(Z102') and a current limiting resistor R101 '(R102') which are connected IN series on a circuit. When the single dry contact is conducted, current flows through a diode of the optocoupler PS2561, the optocoupler PS2561 is conducted, and 8Q2 '(6Q 1') is pulled down to the ground GND; when the dry contact is opened, no current is input into the optocoupler PS2561, and 8Q2 '(6Q 1') outputs a high-impedance state.
Input circuits that are functionally safe for signaling systems generally employ a circuit as shown in fig. 2:
the resistors R and the diodes D in the front end are still used for current limiting and protection of the optocoupler PS. The upper optocoupler PS is controlled by an MCU (not shown) which outputs PWM waves to control the optocoupler to turn on or off. When the outside has the power, the top opto-coupler PS switches on, and the electric current can be inputed the opto-coupler PS of below, then the opto-coupler PS of below switches on, and the AIN signal can obtain the high level. When the external has the level, but when the upper opto-coupler PS does not conduct, the lower opto-coupler PS can not conduct either, so that the AIN outputs a low level, and the high level input from the outside is modulated into a PWM wave. When the external dry contact is opened, AIN always outputs a low level.
The common problems with both types of circuits are:
when the external part is broken or short-circuited, no current flows into the optocoupler, and the state of the dry contact is identified as off; and, also can cause the misidentification when the opto-coupler of circuit takes place to damage.
Therefore, how to provide a system capable of accurately identifying the state of the rail transit dry junction is a technical problem to be solved urgently.
Disclosure of Invention
In view of the defects in the prior art, in one aspect, an embodiment of the present invention provides a rail transit dry junction state determination system, including:
a control circuit;
the signal excitation circuit is connected with the control circuit and used for sending an excitation signal under the control of the control circuit;
a dry contact circuit connected to the signal excitation circuit;
the current acquisition circuit is connected with the dry contact circuit and is used for receiving the feedback current of the excitation signal after passing through the dry contact circuit;
the control circuit is further connected with the current acquisition circuit and used for judging the state of a dry contact in the dry contact circuit according to the feedback current.
In one embodiment, the system further comprises:
the first current limiting resistor is connected in series with the dry contact circuit;
the dry contact circuit includes:
a rectifying diode connected in parallel with the dry contact;
and the second current-limiting resistor is arranged on the branch circuit where the dry contact point is located.
In one embodiment, the excitation signal is an alternating current.
In one embodiment, the determining the state of the dry contact in the dry contact circuit according to the feedback current includes:
if the feedback current is direct current, the dry contact is judged to be disconnected;
if the feedback current is an alternating current with a current value smaller in a half period and larger in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value regularly changing in a period, judging that a short circuit occurs between the first current limiting resistor and the dry contact circuit;
and if the feedback current is 0, judging that the system is broken.
In one embodiment, the control circuit controls the signal excitation circuit to send the excitation signal according to a preset period so as to monitor the state of the dry contact in real time.
On the other hand, an embodiment of the present invention further provides a method for determining a rail transit dry junction state, including:
transmitting an excitation signal to the dry contact circuit;
and judging the state of a dry contact in the dry contact circuit according to the feedback current of the excitation signal passing through the dry contact circuit.
In one embodiment, the dry contact circuit includes:
a rectifying diode connected in parallel with the dry contact;
and the second current-limiting resistor is arranged on the branch circuit where the dry contact point is located.
In one embodiment, the excitation signal is an alternating current.
In one embodiment, the determining the state of the dry contact in the dry contact circuit according to the feedback current of the excitation signal after passing through the dry contact circuit includes:
if the feedback current is direct current, the dry contact is judged to be disconnected;
if the feedback current is an alternating current with a current value smaller in a half period and larger in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value regularly changing in a period, judging that a short circuit occurs between a first current limiting resistor which is connected in series with the dry contact circuit and the dry contact circuit;
and if the feedback current is 0, judging that the open circuit occurs.
In one embodiment, the sending the excitation signal to the dry contact circuit includes:
and sending the excitation signal to the dry contact circuit according to a preset period so as to monitor the state of the dry contact in real time.
According to the rail transit dry contact state judgment system provided by the embodiment of the invention, the excitation circuit is arranged for the dry contact to send the excitation signal, and the current acquisition circuit is used for acquiring the feedback current of the excitation signal passing through the dry contact circuit to judge the state of the dry contact, so that the state of the rail transit dry contact can be accurately identified, and the misjudgment caused by the fact that the judgment of the rail transit dry contact state in the prior art needs to depend on the optical coupler is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a rail transit dry junction acquisition circuit of the prior art that is not functionally safe;
FIG. 2 is a schematic diagram of a prior art input circuit for signaling system functional safety;
fig. 3 is a schematic structural diagram of a rail transit dry junction state determination system according to an embodiment of the invention;
fig. 4 is a waveform diagram of a feedback current when a dry contact is closed in a rail transit dry contact state determination system according to an embodiment of the invention;
fig. 5 is a flowchart illustrating a method for determining a rail transit dry junction state according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 3 is a schematic structural diagram of a rail transit dry junction state determination system according to an embodiment of the present invention, and referring to fig. 3, the system includes:
a control circuit 310;
a signal excitation circuit 320 connected to the control circuit 310 for transmitting an excitation signal under the control of the control circuit 310;
a dry contact circuit 330 connected to the signal driver circuit 320;
the current acquisition circuit 340 is connected with the dry contact circuit 330 and used for receiving the feedback current of the excitation signal after passing through the dry contact circuit 330;
the control circuit 310 is further connected to the current collecting circuit 340, and is configured to determine a state of the dry contact 331 in the dry contact circuit 330 according to the feedback current.
According to the rail transit dry contact state judgment system provided by the embodiment of the invention, the excitation circuit is arranged for the dry contact to send the excitation signal, and the current acquisition circuit is used for acquiring the feedback current of the excitation signal passing through the dry contact circuit to judge the state of the dry contact, so that the state of the dry contact can be accurately identified, and the misjudgment caused by the fact that the judgment of the state of the dry contact in the prior art needs to depend on the optical coupler is avoided.
Specifically, in one embodiment, the system specifically includes:
a first current limiting resistor 350 arranged in series with the dry contact circuit 330; and the dry contact circuit 330 includes:
a rectifying diode 333 connected in parallel with the dry contact 331;
and a second current limiting resistor 332 disposed on the branch where the dry contact 331 is located.
It is understood that, on the one hand, by providing the first current limiting resistor 350 and the second current limiting resistor 332, the components in the system including the dry contact 331 can be protected from damage (e.g., blowing due to excessive current); on the other hand, by matching with the arrangement of the diode 333, the current can be ensured to be changed within a certain range, thereby providing a basis for judging the state of the dry contact 331.
Further, in one embodiment, the excitation signal may be an alternating current.
For example, the excitation signal may be an alternating current having a peak current of not less than 1A. Of course, the specific magnitude and frequency of the alternating current may be adjusted according to actual situations, and the embodiment of the present invention does not limit this.
Since the ac current has a period and its magnitude varies regularly within the period, by cooperating with the rectifying diode 333, different feedback currents can be generated when the dry contact 331 and other components in the system are in different states.
Specifically, on the basis of the above-described embodiments, in one embodiment, the determining the state of the dry contact 331 in the dry contact circuit 330 according to the feedback current includes:
if the feedback current is a direct current, the dry contact 331 is determined to be disconnected;
if the feedback current is an alternating current with a current value smaller in one half period and larger in the other half period, the dry contact 331 is determined to be closed;
if the feedback current is an alternating current whose current value regularly changes in a period, it is determined that a short circuit occurs between the first current limiting resistor 350 and the dry contact point circuit 330;
if the feedback current is 0, the system is judged to be broken.
Referring to fig. 3, it can be understood that when the dry contact 331 is opened, the ac current output by the signal excitation circuit 320 becomes a dc current with only a half cycle after being limited by the first current limiting resistor 350 and rectified by the diode 333.
When the control circuit 310 knows that the feedback current received by the current collecting circuit 340 is the dc current with only positive half cycle or negative half cycle, it can be determined that the dry contact 331 is open, and the whole system has no short circuit or open circuit.
When the dry contact 331 is closed, the dry contact 331 and the second current limiting resistor 332 form a current path and are connected in parallel with the diode 333. After the ac current output by the signal excitation circuit 320 passes through the first current limiting resistor 350 and the dry contact circuit 330 forming a parallel circuit, the current collection circuit 340 will collect ac current with a smaller current value in one half cycle and a larger current value in the other half cycle due to the rectification function of the diode 333, as shown in fig. 4.
It is understood that the specific magnitude of the feedback current depends on the magnitudes of the first current limiting resistor 350 and the second current limiting resistor 332 and the processing capability of the current collection circuit 340.
When the control circuit 310 learns that the feedback current received by the current collecting circuit 340 is an alternating current with a current value smaller in one half period and larger in the other half period, it can be determined that the dry contact 331 is closed and the whole system is not short-circuited or open-circuited.
When a short circuit occurs between the first current-limiting resistor 350 and the dry contact circuit 330, the ac current output by the signal excitation circuit 320 passes through the first current-limiting resistor 350, and then reaches the current collection circuit 340, where the feedback current received by the current collection circuit is a normal (current value regularly changes in a period).
Therefore, when the control circuit 310 learns that the feedback current received by the current collecting circuit 340 is an ac current whose current value regularly changes in a period, it can be determined that a short circuit occurs between the first current limiting resistor 350 and the dry contact circuit 330.
When the system is disconnected, for example, the disconnection occurs between the signal excitation circuit 320 and the first current-limiting resistor 350, the disconnection occurs between the first current-limiting resistor 350 and the dry contact circuit 330, and the like, the current cannot reach the current collection circuit 340, and thus the feedback current received by the current collection circuit 340 is 0.
When the control circuit 310 learns that the feedback current received by the current collecting circuit 340 is 0, it can be determined that the system is disconnected.
As can be seen from the above, the rail transit dry contact state determination system provided in the embodiment of the present invention can determine whether the dry contact 331 is open or closed and whether an external circuit other than the dry contact circuit 330 is short-circuited or open-circuited by determining the magnitude and waveform of the feedback current, so that the determination efficiency is high, and the determination accuracy is very high, thereby perfectly solving the problems of low dry contact state identification efficiency and inaccurate identification in the prior art.
Further, in one embodiment, the control circuit 310 may control the signal excitation circuit 320 to send the excitation signal according to a preset period to monitor the state of the dry contact 331 in real time.
It will be appreciated that a preset period, e.g., every 5 seconds, every 1 hour, etc., may be set such that the signal excitation circuit 320 transmits an excitation signal under the control of the control circuit 310 to monitor the state of the dry contact 331 in real time.
The mode can be arranged at key nodes of rail transit, so that normal and safe operation of the rail transit is guaranteed.
Of course, the control circuit 310 may control the signal excitation circuit 320 to transmit an excitation signal to determine the state of the dry contact 331, if necessary.
Therefore, the rail transit dry contact point state judgment system provided by the embodiment of the invention is also suitable for judging rail transit dry contact point states in various modes, and has a very wide application prospect.
The embodiment of the invention also provides a rail transit trunk junction state judgment method, as shown in fig. 5, the method comprises the following steps:
s510, sending an excitation signal to a dry contact point circuit;
and S520, judging the state of the dry contact in the dry contact circuit according to the feedback current of the excitation signal passing through the dry contact circuit.
It should be noted that the execution main body of the rail transit dry contact state judgment method provided by the embodiment of the present invention may be a computer, for example, a single chip microcomputer, an embedded computer, a microcomputer, an MCU, and the like.
According to the rail transit dry contact state judgment method provided by the embodiment of the invention, the state of the dry contact is judged by receiving the feedback current of the excitation signal after passing through the dry contact circuit, so that the state of the dry contact can be accurately identified, and the misjudgment caused by the fact that the judgment of the state of the dry contact needs to depend on the optical coupler in the prior art is avoided.
In the above method, the dry contact circuit includes:
a rectifying diode connected in parallel with the dry contact;
and the second current limiting resistor is arranged on the branch circuit where the dry contact point is positioned.
It can be understood that, on the one hand, by the arrangement and the second current limiting resistor, the components including the dry contact can be protected from damage (for example, the current is too large to cause blowing); on the other hand, the arrangement of the diode is matched, so that the current can be ensured to change within a certain range, and a basis is provided for the state judgment of the dry contact.
In one embodiment, the excitation signal may be an alternating current.
For example, the excitation signal may be an alternating current having a peak current of not less than 1A. Of course, the specific magnitude and frequency of the alternating current may be adjusted according to actual situations, and the embodiment of the present invention does not limit this.
Because the alternating current has a period and the magnitude of the alternating current regularly changes in the period, different feedback currents can be generated when the dry contact is in different states by matching with the rectifier diode.
Specifically, on the basis of the above embodiment, step S520 may include:
if the feedback current is direct current, the dry contact is judged to be disconnected;
if the feedback current is an alternating current with a current value smaller in a half period and larger in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with the current value regularly changing in a period, judging that a short circuit occurs between a first current limiting resistor which is connected with the main contact circuit in series and the main contact circuit;
if the feedback current is 0, the open circuit is judged to occur.
It can be understood that when the dry contact is opened, the alternating current becomes a direct current with only half a cycle after being limited by the first current limiting resistor and rectified by the diode.
When the received feedback current is only the direct current of the positive half cycle or the negative half cycle, the dry contact can be judged to be disconnected, and short circuit or open circuit does not occur.
When the dry contact point is closed, the dry contact point and the second current-limiting resistor form a current path and are connected with the diode in parallel. After the alternating current passes through the first current limiting resistor and forms a dry contact circuit of the parallel circuit, the alternating current with a smaller current value in a half period and a larger current value in the other half period is collected due to the rectification function of the diode, as shown in fig. 4.
When the received feedback current is an alternating current with a current value smaller in a half period and larger in the other half period, the closing of the dry contact can be judged, and no short circuit or open circuit occurs.
When a short circuit occurs between the first current-limiting resistor and the main contact circuit, the alternating current only passes through the first current-limiting resistor, and the received feedback current is a normal (the current value regularly changes in a period).
Therefore, when the received feedback current is an alternating current with a current value regularly changing in a period, the short circuit between the first current limiting resistor and the dry contact circuit can be judged.
When the open circuit occurs, no current flows in the circuit, so that the feedback current is 0.
Therefore, the rail transit dry contact state judgment method provided by the embodiment of the invention can judge whether the dry contact is opened or closed or not and whether an external circuit except the dry contact circuit is short-circuited or open-circuited or not by judging the magnitude and the waveform of the feedback current, so that the method not only has higher judgment efficiency, but also has very high judgment accuracy, and the problems of low dry contact state identification efficiency and inaccurate identification in the prior art are perfectly solved.
Further, in one embodiment, step S510 may include:
and sending an excitation signal to the dry contact circuit according to a preset period so as to monitor the state of the dry contact in real time.
It will be appreciated that the preset period may be, for example, every 5 seconds, every 1 hour, etc., such that the excitation signal is transmitted at intervals to monitor the status of the dry contact in real time.
The mode can be arranged at key nodes of rail transit, so that normal and safe operation of the rail transit is guaranteed.
Of course, the determination of the dry contact state may be performed by transmitting an excitation signal under manual control, if necessary.
Therefore, the rail transit dry contact point state judgment method provided by the embodiment of the invention is also suitable for judging rail transit dry contact point states in various modes, and has a very wide application prospect.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 3, the electronic device may include: a processor (processor)610, a communication interface (communication interface)620, a memory (memory)630 and a communication bus (bus)640, wherein the processor 610, the communication interface 620 and the memory 630 complete communication with each other through the communication bus 640. The processor 610 may call logic instructions in the memory 630 to execute a rail transit trunk point state determination method, which includes:
transmitting an excitation signal to the dry contact circuit;
and judging the state of the dry contact in the dry contact circuit according to the feedback current of the excitation signal after passing through the dry contact circuit.
In addition, the logic instructions in the memory 630 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In another aspect, an embodiment of the present invention further provides a computer program product, where the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer is capable of executing the rail transit trunk point state judgment method provided by the above-mentioned method embodiments, where the method includes:
transmitting an excitation signal to the dry contact circuit;
and judging the state of the dry contact in the dry contact circuit according to the feedback current of the excitation signal after passing through the dry contact circuit.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented by a processor to execute the rail transit trunk point state determining method provided in the foregoing embodiments, where the method includes:
transmitting an excitation signal to the dry contact circuit;
and judging the state of the dry contact in the dry contact circuit according to the feedback current of the excitation signal after passing through the dry contact circuit.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A rail transit dry junction state judgment system is characterized by comprising:
a control circuit;
the signal excitation circuit is connected with the control circuit and used for sending an excitation signal under the control of the control circuit;
a dry contact circuit connected to the signal excitation circuit;
the current acquisition circuit is connected with the dry contact circuit and is used for receiving the feedback current of the excitation signal after passing through the dry contact circuit;
the control circuit is further connected with the current acquisition circuit and used for judging the state of a dry contact in the dry contact circuit according to the feedback current.
2. The rail transit dry junction state judgment system of claim 1, further comprising:
the first current limiting resistor is connected in series with the dry contact circuit;
the dry contact circuit includes:
a rectifying diode connected in parallel with the dry contact;
and the second current-limiting resistor is arranged on the branch circuit where the dry contact point is located.
3. The rail transit dry junction state judgment system of claim 2, wherein the excitation signal is an alternating current.
4. The rail transit dry contact state determination system of claim 3, wherein the determining the state of a dry contact in the dry contact circuit according to the feedback current comprises:
if the feedback current is direct current, the dry contact is judged to be disconnected;
if the feedback current is an alternating current with a current value smaller in a half period and larger in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value regularly changing in a period, judging that a short circuit occurs between the first current limiting resistor and the dry contact circuit;
and if the feedback current is 0, judging that the system is broken.
5. The rail transit dry contact state judging system according to any one of claims 1-4, wherein the control circuit controls the signal excitation circuit to transmit the excitation signal according to a preset period so as to monitor the state of the dry contact in real time.
6. A rail transit dry junction state judgment method is characterized by comprising the following steps:
transmitting an excitation signal to the dry contact circuit;
and judging the state of a dry contact in the dry contact circuit according to the feedback current of the excitation signal passing through the dry contact circuit.
7. The rail transit dry contact state judgment method according to claim 6, wherein the dry contact circuit comprises:
a rectifying diode connected in parallel with the dry contact;
and the second current-limiting resistor is arranged on the branch circuit where the dry contact point is located.
8. The rail transit dry junction state judgment method according to claim 7, wherein the excitation signal is an alternating current.
9. The rail transit dry contact state judgment method according to claim 8,
the judging the state of the dry contact in the dry contact circuit according to the feedback current of the excitation signal after passing through the dry contact circuit comprises:
if the feedback current is direct current, the dry contact is judged to be disconnected;
if the feedback current is an alternating current with a current value smaller in a half period and larger in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value regularly changing in a period, judging that a short circuit occurs between a first current limiting resistor which is connected in series with the dry contact circuit and the dry contact circuit;
and if the feedback current is 0, judging that the open circuit occurs.
10. The rail transit dry contact state judgment method according to any one of claims 6 to 9, wherein the sending of the excitation signal to the dry contact circuit comprises:
and sending the excitation signal to the dry contact circuit according to a preset period so as to monitor the state of the dry contact in real time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410815A (en) * | 2021-06-30 | 2021-09-17 | 中车株洲电力机车研究所有限公司 | Dry contact control method, system and related assembly |
| CN114844026A (en) * | 2022-07-04 | 2022-08-02 | 北京全路通信信号研究设计院集团有限公司 | Safe input circuit and fault detection method |
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| CN113410815B (en) * | 2021-06-30 | 2024-04-05 | 中车株洲电力机车研究所有限公司 | Dry access point control method, system and related components |
| CN114844026A (en) * | 2022-07-04 | 2022-08-02 | 北京全路通信信号研究设计院集团有限公司 | Safe input circuit and fault detection method |
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