CN112098887B - Rail transit dry contact state judging system and method - Google Patents
Rail transit dry contact state judging system and method Download PDFInfo
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- CN112098887B CN112098887B CN202010827918.9A CN202010827918A CN112098887B CN 112098887 B CN112098887 B CN 112098887B CN 202010827918 A CN202010827918 A CN 202010827918A CN 112098887 B CN112098887 B CN 112098887B
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- 238000004891 communication Methods 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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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 system and a method for judging the state of a rail transit dry contact. 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; a dry junction circuit connected with the signal excitation circuit; the current acquisition circuit is connected with the dry contact circuit and is used for receiving feedback current of the excitation signal after passing through the dry contact circuit; the control circuit is also connected with the current acquisition circuit and is used for judging the state of the dry contact in the dry contact circuit according to the feedback current. The rail transit dry contact state judging system and method provided by the embodiment of the invention can accurately identify the state of the dry contact, thereby avoiding misjudgment caused by the fact that the judgment of the dry contact state in the prior art needs to rely on an optocoupler.
Description
Technical Field
The invention relates to the technical field of rail transit fault detection, in particular to a rail transit dry contact state judging system and method.
Background
In rail transit, a dry junction circuit is a commonly used input circuit format, for example, for collecting the junction on-off states of various relays. However, the on-off of the dry contact point and the on-off of the cable are the same as each other in external appearance, and the common acquisition circuit cannot realize distinguishing and identification.
Currently, in rail transit, a dry access point acquisition circuit for non-functional security is shown in fig. 1:
the power is output from the side of the acquisition equipment, and is input into the optocoupler PS2561 from IN1 '(IN 2') through a diode D101 '(D102'), a voltage stabilizing tube Z101 '(Z102') and a current limiting resistor R101 '(R102') which are connected IN series on a circuit after passing through a dry junction. When the single dry contact is turned on, a current flows through the diode of the optocoupler PS2561, the optocoupler PS2561 is turned on, and 8Q2 '(6Q 1') is pulled down to the ground GND; when the dry junction is off, no current is input into optocoupler PS2561, 8Q2 '(6Q 1') outputs a high resistance state.
The input circuit for functional safety of the signal system generally adopts the circuit shown in fig. 2:
the resistors R and the diode D at 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 on or off. When the power is supplied from the outside, the upper optocoupler PS is turned on, and current can be input to the lower optocoupler PS, so that the lower optocoupler PS is turned on, and the AIN signal can obtain a high level. When the external has a level, but the upper optocoupler PS is not turned on, the lower optocoupler PS is also not turned on, so AIN outputs a low level, thereby modulating the externally input high level into a PWM wave. AIN always outputs a low level when the external dry contact is open.
The common problems with both types of circuits are:
when the outside is broken or short-circuited, no current flows into the optocoupler, and the state of the dry contact is identified as open; and, when the optocoupler of the circuit is damaged, misrecognition may also be caused.
Therefore, how to propose a system capable of accurately identifying the state of the rail transit dry contact is called as a technical problem to be solved.
Disclosure of Invention
In view of the defects in the prior art, on the one hand, an embodiment of the present invention provides a rail transit dry contact status judging 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 with the signal excitation circuit;
the current acquisition circuit is connected with the dry contact circuit and is used for receiving feedback current of the excitation signal after passing through the dry contact circuit;
the control circuit is also connected with the current acquisition circuit and is 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 arranged in series with the dry contact circuit;
the dry-contact circuit includes:
a rectifier diode connected in parallel with the dry junction;
and the second current limiting resistor is arranged on the branch where the dry junction 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, judging that the plurality of contact points are disconnected;
if the feedback current is an alternating current with a smaller current value in a half period and a larger current value in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value which changes regularly 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 disconnected.
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, the embodiment of the invention also provides a method for judging the state of the rail transit dry contact, which comprises 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 after passing through the dry contact circuit.
In one embodiment, the dry-contact circuit includes:
a rectifier diode connected in parallel with the dry junction;
and the second current limiting resistor is arranged on the branch where the dry junction 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, judging that the plurality of contact points are disconnected;
if the feedback current is an alternating current with a smaller current value in a half period and a larger current value in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value which changes regularly in a period, judging that a short circuit occurs between a first current limiting resistor which is arranged in series with the dry contact circuit and the dry contact circuit;
and if the feedback current is 0, judging that the circuit breaking occurs.
In one embodiment, the transmitting the excitation signal to the dry-access point 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.
According to the rail transit dry junction state judging system provided by the embodiment of the invention, the exciting circuit is arranged for the dry junction to send the exciting signal, and the current collecting circuit is used for collecting the feedback current of the exciting signal after passing through the dry junction circuit to judge the state of the dry junction, so that the state of the rail transit dry junction can be accurately identified, and the misjudgment caused by the fact that the judgment of the state of the rail transit dry junction in the prior art is needed to depend on an optocoupler is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art non-functional secure rail transit trunk access point acquisition circuit;
FIG. 2 is a schematic diagram of a prior art input circuit for functional safety of a signaling system;
FIG. 3 is a schematic diagram of a rail transit trunk junction status determination system according to an embodiment of the present invention;
FIG. 4 is a waveform diagram of feedback current when a dry junction is closed in a rail transit dry junction status determination system according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for determining a dry junction state of a rail transit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 3 is a schematic structural diagram of a rail transit trunk junction status 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 excitation circuit 320;
the current acquisition circuit 340 is connected with the dry contact circuit 330 and is used for receiving 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 judging system provided by the embodiment of the invention, the exciting circuit is arranged for the dry contact to send the exciting signal, and the current collecting circuit is used for collecting the feedback current of the exciting signal after 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 needs to depend on an optocoupler in the prior art is avoided.
Specifically, in one embodiment, the system specifically includes:
a first current limiting resistor 350 disposed in series with the dry-contact circuit 330; and the dry-contact circuit 330 includes:
a rectifier diode 333 connected in parallel with the dry junction 331;
the second current limiting resistor 332 is disposed on the branch where the dry contact 331 is located.
It will be appreciated that by providing the first current limiting resistor 350 and the second current limiting resistor 332, on the one hand, components within the system including the dry contact 331 may be protected from damage (e.g., excessive current resulting in blow out); on the other hand, by matching the diode 333, the current can be ensured to change within a certain range, so as to provide 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 ac current may be adjusted according to the actual situation, which is not limited by the embodiment of the present invention.
Since the ac current has a period and its magnitude varies regularly within the period, by matching with the rectifier diode 333, different feedback currents can be generated when the dry junction 331 and other components in the system are in different states.
Specifically, on the basis of the above embodiment, in one embodiment, 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, judging that the dry contact 331 is disconnected;
if the feedback current is an ac current with a smaller current value in one half period and a larger current value in the other half period, then the dry contact 331 is judged to be closed;
if the feedback current is an ac current with a current value that changes regularly in the period, it is determined that a short circuit occurs between the first current limiting resistor 350 and the dry contact circuit 330;
if the feedback current is 0, judging that the system is disconnected.
Referring to fig. 3, it can be understood that when the dry contact 331 is opened, the ac current output by the signal exciting circuit 320 is limited by the first current limiting resistor 350 and the diode 333 rectifies the ac current, and then the ac current becomes a dc current with only half a period.
When the control circuit 310 knows that the feedback current received by the current collecting circuit 340 is a direct current with only a positive half cycle or a negative half cycle, it can determine that the dry contact 331 is opened, and no short circuit or open circuit occurs in the whole system.
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 exciting circuit 320 passes through the first current limiting resistor 350 and the dry junction circuit 330 forming a parallel circuit, the current collecting circuit 340 will collect the ac current with a smaller current value in one half period and a larger ac current in the other half period due to the rectifying action of the diode 333, as shown in fig. 4.
It will be appreciated that the specific magnitude of the feedback current depends on the magnitudes of the first and second current limiting resistors 350, 332 and the processing power of the current acquisition circuit 340.
When the control circuit 310 knows that the feedback current received by the current collecting circuit 340 is an ac current with a smaller current value in one half period and a larger current value in the other half period, it can be determined that the dry contact 331 is closed, and no short circuit or open circuit occurs in the whole system.
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 exciting circuit 320 passes through the first current limiting resistor 350 and then reaches the current collecting circuit 340, and the feedback current received by the current collecting circuit is normal (the current value changes regularly in the period).
Therefore, when the control circuit 310 knows that the feedback current received by the current collecting circuit 340 is an ac current with a current value that regularly changes in a period, it can determine 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, disconnection occurs between the signal exciting circuit 320 and the first current limiting resistor 350, disconnection occurs between the first current limiting resistor 350 and the dry-contact circuit 330, and the current cannot reach the current collecting circuit 340, so that the feedback current received by the current collecting circuit 340 is 0.
When the control circuit 310 knows that the feedback current received by the current acquisition circuit 340 is 0, it can determine that the system is disconnected.
As can be seen from the above, the rail transit dry contact state judging system provided by the embodiment of the present invention can judge whether the dry contact 331 is opened or closed and whether the external circuit except the dry contact circuit 330 is short-circuited or open-circuited by judging the magnitude and waveform of the feedback current, so that the rail transit dry contact state judging system has high judging efficiency and high judging accuracy, and thus the problems of low state identifying efficiency and inaccurate identification of the dry contact existing in the prior art are perfectly solved.
Further, in one embodiment, the control circuit 310 may send an excitation signal to the excitation circuit 320 according to a preset period control signal to monitor the state of the dry contact 331 in real time.
It will be appreciated that a preset period, for example, 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, thereby monitoring the state of the dry contact 331 in real time.
Such a mode may be provided at a critical node of, for example, rail traffic, thereby ensuring normal safe operation of the rail traffic.
Of course, the determination of the state of the dry contact 331 may be performed by causing the control circuit 310 to control the signal excitation circuit 320 to transmit an excitation signal, if necessary.
Therefore, the rail transit dry junction state judging system provided by the embodiment of the invention is also suitable for judging the rail transit dry junction states of various modes, and has very wide application prospects.
The embodiment of the invention also provides a method for judging the state of the rail transit dry contact, as shown in fig. 5, which comprises the following steps:
s510, sending an excitation signal to a dry access point circuit;
s520, 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.
It should be noted that, the execution main body of the rail transit dry contact state judging method provided by the embodiment of the 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 judging 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 in the prior art is needed to depend on an optocoupler is avoided.
In the above method, the dry access point circuit includes:
a rectifier diode connected in parallel with the dry junction;
the second current limiting resistor is arranged on the branch where the dry junction is located.
It will be appreciated that by providing and a second current limiting resistor, on the one hand, components including the dry junction can be protected from damage (e.g. from excessive current resulting in blow out); on the other hand, by matching with the arrangement of the diode, the current can be ensured to change within a certain range, thereby providing a basis for judging the state 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 ac current may be adjusted according to the actual situation, which is not limited by the embodiment of the present invention.
Because the alternating current has a period and the size of the alternating current changes regularly in the period, different feedback currents can be generated when the dry junction 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, judging that the dry contact is disconnected;
if the feedback current is an alternating current with a smaller current value in one half period and a larger current value in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value which changes regularly in a period, judging that a short circuit occurs between a first current limiting resistor which is arranged in series with the dry contact circuit and the dry contact circuit;
if the feedback current is 0, the circuit breaking is judged to occur.
It will be appreciated that when the dry junction is disconnected, the ac current is limited by the first current limiting resistor and the diode is rectified, and then becomes a dc current with only half a cycle.
When the received feedback current is direct current with only positive half cycle or negative half cycle, the dry contact point can be judged to be disconnected, and no short circuit or open circuit occurs.
When the dry junction is closed, the dry junction and the second current limiting resistor form a current path and are connected in parallel with the diode. After the alternating current passes through the first current limiting resistor and forms a dry junction circuit of the parallel circuit, the current value is collected to be smaller in one half period and larger in the other half period due to the rectification effect of the diode, as shown in fig. 4.
When the received feedback current is an alternating current with a smaller current value in one half period and a larger current value in the other half period, the dry contact point can be judged to be closed, and no short circuit or open circuit occurs.
When short circuit occurs between the first current limiting resistor and the dry contact circuit, the alternating current only passes through the first current limiting resistor, and the feedback current received at the moment is normal (the current value changes regularly in the period).
Therefore, when the received feedback current is an alternating current with a current value which changes regularly in a period, the short circuit between the first current limiting resistor and the dry contact circuit can be judged.
When the circuit is broken, no current exists in the circuit, so the feedback current is 0.
According to the method for judging the state of the rail transit dry junction, provided by the embodiment of the invention, whether the dry junction is opened or closed and whether the external circuit except the dry junction circuit is short-circuited or broken can be judged by judging the magnitude and waveform of the feedback current, so that the method has high judging efficiency and high judging accuracy, and the problems of low state identification efficiency and inaccurate identification of the dry junction 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 sent at intervals of time to monitor the status of the dry contact in real time.
Such a mode may be provided at a critical node of, for example, rail traffic, thereby ensuring normal safe operation of the rail traffic.
Of course, the determination of the dry contact state may be performed by manually transmitting an excitation signal when necessary.
Therefore, the method for judging the rail transit dry junction state provided by the embodiment of the invention is also suitable for judging the rail transit dry junction state in multiple modes, and has very wide application prospect.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 3, where 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 communicate with each other via the communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a rail transit trunk endpoint status determination method comprising:
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.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product.
Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read Only Memory (ROM), a random access memory (RAM, randomAccessMemory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, embodiments of the present invention further provide a computer program product, including a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, which when executed by a computer, are capable of executing the rail transit trunk joint state determination method provided in the above method embodiments, the method including:
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 still another aspect, an embodiment of the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the method for determining a road traffic dry junction state provided in the above embodiments, the method including:
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 apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A rail transit trunk junction condition determination system, comprising:
a control circuit;
the signal excitation circuit is connected with the control circuit and used for sending alternating current under the control of the control circuit;
a dry contact circuit connected with the signal excitation circuit;
the current acquisition circuit is connected with the dry contact circuit and is used for receiving feedback current of the alternating current after passing through the dry contact circuit;
the first current limiting resistor is arranged in series with the dry contact circuit;
the dry-contact circuit includes:
a rectifier diode connected in parallel with the dry junction;
the second current limiting resistor is arranged on the branch where the dry contact point is located;
the control circuit is further connected with the current acquisition circuit and is used for judging the state of a dry contact in the dry contact circuit according to the feedback current:
if the feedback current is direct current, judging that the plurality of contact points are disconnected;
if the feedback current is an alternating current with a smaller current value in a half period and a larger current value in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value which changes regularly 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 disconnected.
2. The system according to claim 1, wherein the control circuit controls the signal excitation circuit to send the alternating current according to a preset period to monitor the state of the dry junction in real time.
3. The method for judging the state of the rail transit dry junction is characterized by comprising the following steps of:
transmitting an alternating current to the dry-contact circuit; the dry-contact circuit includes: a rectifier diode connected in parallel with the dry junction; the second current limiting resistor is arranged on the branch where the dry contact point is located;
judging the state of a dry contact in the dry contact circuit according to the feedback current of the alternating current after passing through the dry contact circuit:
if the feedback current is direct current, judging that the plurality of contact points are disconnected;
if the feedback current is an alternating current with a smaller current value in a half period and a larger current value in the other half period, judging that the dry contact is closed;
if the feedback current is alternating current with a current value which changes regularly in a period, judging that a short circuit occurs between a first current limiting resistor which is arranged in series with the dry contact circuit and the dry contact circuit;
and if the feedback current is 0, judging that the circuit breaking occurs.
4. The method of claim 3, wherein the sending an ac current to the dry access point circuit comprises:
and sending the alternating current 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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| 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 |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06213978A (en) * | 1993-01-19 | 1994-08-05 | Fuji Electric Co Ltd | Test circuit for switch |
| JP2001041996A (en) * | 1999-07-30 | 2001-02-16 | Matsushita Electric Works Ltd | Failure detection system of ac circuit |
| JP2003125532A (en) * | 2001-10-12 | 2003-04-25 | Kawamura Electric Inc | Tracking breaker |
| JP2007083932A (en) * | 2005-09-22 | 2007-04-05 | Daido Signal Co Ltd | Switching element failure detecting circuit |
| CN101629984A (en) * | 2008-07-14 | 2010-01-20 | 梅特勒-托利多仪器（上海）有限公司 | Method and device for detecting open circuit and short circuit of electromagnetic solution conductivity measuring device |
| JP2011053175A (en) * | 2009-09-04 | 2011-03-17 | Toyota Motor Corp | Disconnection detector |
| CN103472354A (en) * | 2013-09-26 | 2013-12-25 | 无锡智卓电气有限公司 | Switching-closing judging circuit of electric leakage reclosure breaker |
| CN204166102U (en) * | 2014-11-14 | 2015-02-18 | 安科瑞电气股份有限公司 | A kind of strong electrically driven (operated) switch condition detection circuit |
| CN206440802U (en) * | 2016-09-28 | 2017-08-25 | 西门子瑞士有限公司 | The observation circuit of monitoring field stem grafting dotted state |
| CN108089567A (en) * | 2017-12-11 | 2018-05-29 | 成都运达科技股份有限公司 | A kind of semiconductor dry and wet contact fault diagnosis circuit and diagnostic method |
| CN109387683A (en) * | 2017-08-04 | 2019-02-26 | 许继集团有限公司 | A kind of combined-voltage and the adaptively sampled circuit of current signal and method |
-
2020
- 2020-08-17 CN CN202010827918.9A patent/CN112098887B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06213978A (en) * | 1993-01-19 | 1994-08-05 | Fuji Electric Co Ltd | Test circuit for switch |
| JP2001041996A (en) * | 1999-07-30 | 2001-02-16 | Matsushita Electric Works Ltd | Failure detection system of ac circuit |
| JP2003125532A (en) * | 2001-10-12 | 2003-04-25 | Kawamura Electric Inc | Tracking breaker |
| JP2007083932A (en) * | 2005-09-22 | 2007-04-05 | Daido Signal Co Ltd | Switching element failure detecting circuit |
| CN101629984A (en) * | 2008-07-14 | 2010-01-20 | 梅特勒-托利多仪器（上海）有限公司 | Method and device for detecting open circuit and short circuit of electromagnetic solution conductivity measuring device |
| JP2011053175A (en) * | 2009-09-04 | 2011-03-17 | Toyota Motor Corp | Disconnection detector |
| CN103472354A (en) * | 2013-09-26 | 2013-12-25 | 无锡智卓电气有限公司 | Switching-closing judging circuit of electric leakage reclosure breaker |
| CN204166102U (en) * | 2014-11-14 | 2015-02-18 | 安科瑞电气股份有限公司 | A kind of strong electrically driven (operated) switch condition detection circuit |
| CN206440802U (en) * | 2016-09-28 | 2017-08-25 | 西门子瑞士有限公司 | The observation circuit of monitoring field stem grafting dotted state |
| CN109387683A (en) * | 2017-08-04 | 2019-02-26 | 许继集团有限公司 | A kind of combined-voltage and the adaptively sampled circuit of current signal and method |
| CN108089567A (en) * | 2017-12-11 | 2018-05-29 | 成都运达科技股份有限公司 | A kind of semiconductor dry and wet contact fault diagnosis circuit and diagnostic method |
Non-Patent Citations (3)
| Title |
|---|
| A new fault detection method for modular multilevel converter semiconductor power switches;Saeed Haghnazari等;《IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society》;全文 * |
| 多路开关状态检测;王力等;《电子设计工程》;第19卷(第14期);全文 * |
| 高压断路器辅助开关检测技术的改进;谭展等;《农村电气化》(第7期);全文 * |
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