A train signal control system and its relay contact detection device

Abstract

This application discloses a relay contact detection device, comprising: a drive circuit for receiving electrical energy from a first power source and outputting a first electrical signal according to the control rules of a controller; a self-test circuit for transmitting the first electrical signal to the first contact of the relay under test when it is not in a self-test state; a controller for implementing self-testing of the relay contact detection device when the self-test circuit is in a self-test state; after controlling the self-test circuit to be in a non-self-test state, determining whether the first electrical signal is received through the input channel acquisition circuit; if so, determining that the first and second contacts of the relay under test are in a conducting state; if not, determining that the first and second contacts of the relay under test are in a closed state; and an input channel acquisition circuit. Applying the solution of this application can effectively improve the accuracy of detecting the state of relay contacts. This application also provides a train signal control system with corresponding effects.

Description

Technical Field

[0001] This invention relates to the field of signal detection technology, and in particular to a train signal control system and its relay contact detection device. Background Technology

[0002] A relay is an electrical control device that plays a role in dynamic adjustment, safety protection, and timely switching in circuits. Any set of contacts on a relay can reflect the state of its control coil. In rail transit signaling systems, it is often necessary to collect the state of the relay's control coil by detecting the state of the contacts, and then other application software performs corresponding logic control based on the coil's state. However, in practical applications, inaccurate detection results frequently occur, which is detrimental to the stable operation of trains.

[0003] In conclusion, how to effectively improve the accuracy of detecting the state of relay contacts is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a train signal control system and its relay contact detection device to effectively improve the accuracy of detecting the state of relay contacts.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A relay contact detection device, comprising:

[0007] A drive circuit connected to the controller and the first power supply is used to receive electrical energy from the first power supply and output a first electrical signal according to the control rules of the controller.

[0008] A self-test circuit, connected to the drive circuit, the controller, the second power supply, the input channel acquisition circuit, and the first contact of the relay under test, is used to transmit the first electrical signal to the input channel acquisition circuit and transmit the received power from the second power supply to the controller when it is in a self-test state; and to transmit the first electrical signal to the first contact of the relay under test when it is not in a self-test state.

[0009] The controller, connected to the input channel acquisition circuit, is configured to, after controlling the self-test circuit to be in self-test mode, determine that the relay contact detection device has passed self-test when it receives electrical energy from the second power supply and receives the first electrical signal through the input channel acquisition circuit; after controlling the self-test circuit to be in non-self-test mode, determine whether the first electrical signal is received through the input channel acquisition circuit; if yes, determine that the first contact and the second contact of the relay under test are in a conducting state; if no, determine that the first contact and the second contact of the relay under test are in a closed state.

[0010] The input channel acquisition circuit is connected to the second contact of the relay under test.

[0011] Preferably, the first electrical signal is a pulse signal whose duty cycle is controlled by the controller.

[0012] Preferably, the controller is specifically used to control the self-test circuit to a self-test state according to a preset cycle.

[0013] Preferably, the controller is further configured to:

[0014] When it is determined that the relay contact detection device has failed the self-test, the first prompt message is output.

[0015] Preferred options also include:

[0016] A first diode is connected in series between the first contact of the relay under test and the self-test circuit, and the cathode of the first diode is connected to the first contact of the relay under test.

[0017] Preferred options also include:

[0018] A second diode is connected in series between the self-test circuit and the input channel acquisition circuit, and the cathode of the second diode is connected to the input channel acquisition circuit.

[0019] Preferably, the input channel acquisition circuit includes:

[0020] The input terminal serves as the input terminal of the input channel acquisition circuit, which is a voltage divider filter circuit.

[0021] The input terminal is connected to the output terminal of the voltage divider filter circuit, and the output terminal serves as the first isolation circuit for the output terminal of the input channel acquisition circuit.

[0022] Preferably, the first isolation circuit is a first isolation circuit based on a capacitor chip.

[0023] Preferably, the voltage divider filter circuit includes:

[0024] The first terminal serves as the input terminal of the voltage divider filter circuit, and the second terminal is connected to the first resistor at the first terminal of the second resistor.

[0025] The second end is connected to the first end of the third resistor and the first end of the first capacitor respectively, and the connection end serves as the second resistor at the output end of the voltage divider filter circuit.

[0026] The third resistor with its second terminal grounded;

[0027] The first capacitor with its second terminal grounded.

[0028] Preferred options also include:

[0029] A Zener diode with its negative terminal connected to the second end of the first resistor and the first end of the second resistor, and its positive terminal grounded;

[0030] A TVS diode with its negative terminal connected to the first end of the first resistor and its positive terminal grounded.

[0031] Preferably, the self-test circuit includes a first relay;

[0032] The first and second ends of the control coil of the first relay are respectively connected to the positive terminal of the third power supply and the controller. The moving end of the first controlled branch of the first relay is connected to the output terminal of the drive circuit. The first and second stationary ends of the first controlled branch of the first relay are respectively connected to the first contact of the relay under test and the input channel acquisition circuit. The moving end of the second controlled branch of the first relay is connected to the second power supply. The first stationary end of the second controlled branch of the first relay is left floating. The second stationary end of the second controlled branch of the first relay is connected to the controller.

[0033] Preferred options also include:

[0034] A second isolation circuit is provided between the controller and the drive circuit.

[0035] Preferred options also include:

[0036] An isolation power supply circuit is provided between the drive circuit and the first power supply.

[0037] Preferably, the driving circuit includes:

[0038] The first end is connected to the controller and serves as the control end of the drive circuit. The second end is connected to the control end of the first switching transistor, the first end of the fifth resistor, and the first end of the second capacitor, respectively, as a fourth resistor.

[0039] The fifth resistor with its second terminal grounded;

[0040] The second capacitor with its second terminal grounded;

[0041] The first switch transistor has its first terminal connected to the first terminal of the sixth resistor and its second terminal grounded.

[0042] The sixth resistor, whose second end is connected to the first end of the seventh resistor and the control end of the second switch transistor respectively;

[0043] The seventh resistor, whose second end is connected to the second end of the second switching transistor, and whose connection end is connected to the first power supply as the input end of the driving circuit;

[0044] The second switching transistor has its first terminal serving as the output terminal of the driving circuit.

[0045] A train signal control system includes the relay contact detection device described in any one of the above claims.

[0046] Applying the technical solution provided by the embodiments of the present invention, considering that the inaccuracy of relay contact state detection in traditional solutions is often due to abnormalities in the detection device itself, the relay contact detection device of this application can not only detect whether the first contact and the second contact of the relay under test are in a conducting state or a closed state, but also use a self-test circuit to determine whether the relay contact detection device itself can pass the self-test.

[0047] Specifically, the drive circuit can output a first electrical signal according to the controller's control rules. When the self-test circuit is in self-test mode, it transmits the first electrical signal to the input channel acquisition circuit 40 and transmits the received power from the second power source to the controller. Therefore, when the controller receives the power from the second power source and receives the first electrical signal through the input channel acquisition circuit, it can determine that the relay contact detection device has passed the self-test. When the self-test circuit is not in self-test mode, it transmits the first electrical signal to the first contact of the relay under test. After controlling the self-test circuit to be in non-self-test mode, the controller can determine whether the first electrical signal has been received through the input channel acquisition circuit. If so, it determines that the first and second contacts of the relay under test are in a conducting state; if not, it determines that the first and second contacts of the relay under test are in a closed state. In other words, when the self-test circuit is in non-self-test mode, the relay contact detection device of this application can realize the continuity detection between the first and second contacts of the relay under test.

[0048] In summary, since the solution of this application can perform self-testing on the relay contact detection device, it can avoid the situation where the contact status detection of the relay under test is inaccurate due to the abnormality of the relay contact detection device itself. That is, this application is beneficial to effectively improve the accuracy of detecting the relay contact status. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the structure of a relay contact detection device according to the present invention;

[0051] Figure 2 This is a schematic diagram of the driving circuit in a specific embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram of the structure of a relay contact detection device in a specific embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of the input channel acquisition circuit in a specific embodiment of the present invention. Detailed Implementation

[0054] The core of this invention is to provide a relay contact detection device, which helps to effectively improve the accuracy of detecting the state of relay contacts.

[0055] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a relay contact detection device according to the present invention. The relay contact detection device may include:

[0057] The drive circuit 10, which is connected to the controller 30 and the first power supply V1, is used to receive the electrical energy from the first power supply V1 and output the first electrical signal according to the control rules of the controller 30.

[0058] The self-test circuit 20, which is connected to the drive circuit 10, the controller 30, the second power supply V2, the input channel acquisition circuit 40, and the first contact of the relay under test, is used to transmit the first electrical signal to the input channel acquisition circuit 40 and transmit the received power from the second power supply V2 to the controller 30 when it is in self-test mode; and to transmit the first electrical signal to the first contact of the relay under test when it is not in self-test mode.

[0059] The controller 30, connected to the input channel acquisition circuit 40, is used to determine that the relay contact detection device has passed the self-test when it receives electrical energy from the second power supply V2 and receives the first electrical signal through the input channel acquisition circuit 40 after the self-test circuit 20 is in the self-test state; after the self-test circuit 20 is in the non-self-test state, it determines whether the first electrical signal is received through the input channel acquisition circuit 40. If yes, it determines that the first contact and the second contact of the relay under test are in a conducting state; if no, it determines that the first contact and the second contact of the relay under test are in a closed state.

[0060] Input channel acquisition circuit 40 connected to the second contact of the relay under test.

[0061] Specifically, in this application, the driving circuit 10 receives electrical energy from the first power supply V1 and outputs a first electrical signal according to the control rules of the controller 30. The first power supply V1 is typically a DC power supply, and its specific voltage level can be set and adjusted as needed, for example, 24V. Similarly, the voltage levels of the various power supplies described below can also be set and adjusted according to actual needs without affecting the implementation of this invention.

[0062] In one specific embodiment of the present invention, see [reference needed]. Figure 3 It may also include an isolation power supply circuit 60 disposed between the drive circuit 10 and the first power supply V1. The specific circuit configuration of the isolation power supply circuit 60 can also be set as needed, for example, a 24V to 24V isolation power supply circuit 60 can be used. By setting the isolation power supply circuit 60, the first power supply V1 can be isolated from the contact group of the relay under test, which improves the safety and reliability of the solution in this application.

[0063] The drive circuit 10 is typically a transistor-based drive circuit. The controller 30 controls the waveform of the first electrical signal output by the drive circuit 10 by controlling the on / off state of the corresponding transistor. In other words, the waveform of the first electrical signal is affected by the control rules of the controller 30. For example, a simple approach is for the controller 30 to keep the drive circuit 10 on, so that the first electrical signal is a continuous high-level signal.

[0064] Furthermore, in a specific embodiment of the present invention, considering that when the first electrical signal is a pulse signal, the contact status detection of the relay under test and the self-test of the relay contact detection device can also be realized, the first electrical signal is set as a pulse signal in this embodiment. The first electrical signal is a pulse signal with a duty cycle controlled by the controller 30. Compared with a continuous high-level signal, it is beneficial to reduce the power consumption of the present application solution. Figure 2 The implementation method selected is this one.

[0065] The specific circuit configuration of the drive circuit 10 can be set and adjusted according to actual needs. For example, in one specific embodiment of the present invention, see [reference needed]. Figure 2 The driving circuit 10 includes:

[0066] The first end is connected to the controller 30 and serves as the control end of the drive circuit 10. The second end is connected to the control end of the first switch Q1, the first end of the fifth resistor R5 and the first end of the second capacitor C2, respectively, to the fourth resistor R4.

[0067] The fifth resistor R5 with its second terminal grounded;

[0068] The second capacitor C2 with its second terminal grounded;

[0069] The first terminal is connected to the first terminal of the sixth resistor R6, and the second terminal is grounded;

[0070] The second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7 and the control end of the second switch Q2 respectively.

[0071] The seventh resistor R7 is connected to the second terminal of the second switch Q2, and the connection terminal is connected to the first power supply V1 as the input terminal of the drive circuit 10.

[0072] The first terminal serves as the output terminal of the second switch Q2 in the drive circuit 10.

[0073] In this embodiment, voltage division is achieved through the fourth resistor R4 and the fifth resistor R5, and filtering is achieved through the second capacitor C2. The first switch Q1, the sixth resistor R6, the seventh resistor R7, and the second switch Q2 constitute a transistor switching circuit to realize waveform control of the output first electrical signal under the control of the controller 30.

[0074] The drive circuit 10 in this embodiment has a simple circuit structure and high reliability. The specific parameters of each resistor, each switch transistor, and the second capacitor C2 can be set and adjusted according to actual needs.

[0075] The drive circuit 10 outputs a first electrical signal. When the controller 30 controls the self-test circuit 20 to self-test mode, the self-test circuit 20 transmits the first electrical signal to the input channel acquisition circuit 40 and transmits the received power from the second power supply V2 to the controller 30. After the controller 30 controls the self-test circuit 20 to self-test mode, if it receives power from the second power supply V2, it indicates that the self-test circuit 20 itself is normal. If it receives the first electrical signal through the input channel acquisition circuit 40, it indicates that the input channel acquisition circuit 40 and the drive circuit 10 are also normal. That is, the circuit used to transmit the first electrical signal is normal. Therefore, when the controller 30 receives power from the second power supply V2 and receives the first electrical signal through the input channel acquisition circuit 40, it can be determined that the relay contact detection device has passed the self-test.

[0076] Of course, if no power is received from the second power supply V2, or if the first electrical signal is not received through the input channel acquisition circuit 40, it can be determined that the relay contact detection device has failed its self-test. After determining that it has failed, specific countermeasures can be set and adjusted as needed. For example, the detection of the contact status of the relay under test can be suspended until the operator repairs the fault. In another specific embodiment of the present invention, the controller 30 can also be used to output a first prompt message when it is determined that the relay contact detection device has failed its self-test, so that relevant personnel can discover the situation in time and thus handle the fault as early as possible.

[0077] Whether the self-test circuit 20 is in self-test mode is controlled by the controller 30. In practical applications, considering that the malfunction of the relay contact detection device is a random event, the controller 30 can specifically be used to control the self-test circuit 20 to be in self-test mode according to a preset cycle, thereby promptly determining whether the relay contact detection device has malfunctioned. Of course, other control methods can be used in other situations, such as performing a self-test every time the train enters the depot, or manual control by staff to decide whether to perform a self-test of the relay contact detection device as needed.

[0078] The specific circuit configuration of the self-test circuit 20 can be set and adjusted as needed to achieve the purpose of this application. For example, in a specific embodiment of the present invention, the self-test circuit 20 includes a first relay K1.

[0079] The first and second ends of the control coil of the first relay K1 are connected to the positive terminal of the third power supply V3 and the controller 30, respectively. The moving end of the first controlled branch of the first relay K1 is connected to the output terminal of the drive circuit 10. The first and second stationary ends of the first controlled branch of the first relay K1 are connected to the first contact of the relay under test and the input channel acquisition circuit 40, respectively. The moving end of the second controlled branch of the first relay K1 is connected to the second power supply V2. The first stationary end of the second controlled branch of the first relay K1 is left floating. The second stationary end of the second controlled branch of the first relay K1 is connected to the controller 30.

[0080] In this embodiment, the self-test circuit 20 of this application can be implemented through the first relay K1, making the structure of the self-test circuit 20 very simple and highly reliable. Figure 3 This is the implementation method used in the example. When using the first relay K1, it is required that the first relay K1 has at least two controlled branches. The controller 30 can control whether the first relay K1 is energized by controlling the energization state of the control coil of the first relay K1, and thus control the state of each controlled branch of the first relay K1. For example, in a specific case, when the first relay K1 is energized, the moving end of the first controlled branch of the first relay K1 is connected to the first stationary end of the first controlled branch of the first relay K1, and the moving end of the second controlled branch of the first relay K1 is connected to the first stationary end of the second controlled branch of the first relay K1. Conversely, when the first relay K1 is not energized, the moving end of the first controlled branch of the first relay K1 is connected to the second stationary end of the first controlled branch of the first relay K1, and the moving end of the second controlled branch of the first relay K1 is connected to the second stationary end of the second controlled branch of the first relay K1.

[0081] The drive circuit 10 outputs a first electrical signal. When the controller 30 controls the self-test circuit 20 to a non-self-test state, the self-test circuit 20 transmits the first electrical signal to the first contact of the relay under test. As can be seen from the circuit structure, if the first and second contacts of the relay under test are in a conducting state, the controller 30 can receive the first electrical signal through the input channel acquisition circuit 40. Conversely, if the first and second contacts of the relay under test are in a closed state, the controller 30 cannot receive the first electrical signal. Therefore, after controlling the self-test circuit 20 to a non-self-test state, the controller 30 can determine the on / off state between the first and second contacts of the relay under test by judging whether the first electrical signal is received through the input channel acquisition circuit 40. That is, the relay contact detection device of this application realizes the function of detecting the contact state of the relay under test.

[0082] The first and second contacts of the relay under test, as a set of contacts or a controlled branch of the relay, can reflect the energization state of the relay's control coil. Of course, when the relay under test has other controlled branches, it can also reflect the state of those other controlled branches. Knowing the energization state of the relay's control coil allows for the implementation of corresponding logic control, ensuring the stable operation of the train. This application... Figure 1 and Figure 3 In both cases, only the first and second contacts of the relay under test are shown, and the control coil of the relay under test is not shown.

[0083] In one specific embodiment of the present invention, it may further include:

[0084] A first diode D1 is connected in series between the first contact of the relay under test and the self-test circuit 20, and the cathode of the first diode D1 is connected to the first contact of the relay under test.

[0085] In this embodiment, by setting the first diode D1, it can play a role in preventing reverse voltage when external voltage is present. For example, when the field environment is harsh, induced voltage may occur. Or, when the relay contact detection device is used in combination with other boards, external voltage may be introduced through the first and second contacts of the relay under test. By setting the first diode D1, the circuit and power supply in the relay contact detection device of this application can be effectively protected.

[0086] Similarly, in one specific embodiment of the present invention, it may further include:

[0087] A second diode D2 is connected in series between the self-test circuit 20 and the input channel acquisition circuit 40, and the cathode of the second diode D2 is connected to the input channel acquisition circuit 40.

[0088] In this embodiment, by setting the second diode D2, when the self-test circuit is in self-test mode, it can prevent external voltage from flowing into the relay contact detection device of this application when the first and second contacts of the relay under test are closed, which could damage the circuit and power supply of the relay contact detection device. In other words, by setting the second diode D2, the safety and reliability of the relay contact detection device of this application can be effectively guaranteed.

[0089] The specific circuit configuration of the input channel acquisition circuit 40 can be set and adjusted as needed. For example, in one specific embodiment of the present invention, the input channel acquisition circuit 40 may include:

[0090] The input terminal serves as the input terminal of the input channel acquisition circuit 40, which is a voltage divider and filter circuit 41.

[0091] The input terminal is connected to the output terminal of the voltage divider filter circuit 41, and the output terminal serves as the first isolation circuit 42 of the input channel acquisition circuit 40.

[0092] The voltage divider filter circuit 41 effectively avoids interference, while the first isolation circuit 42 isolates analog and digital circuits, improving the system's anti-interference capability.

[0093] Furthermore, considering that traditional isolation circuits generally use optocouplers as isolation devices, and that optocouplers convert optical signals to electrical signals via light-emitting diodes (LEDs), the grating problem of LEDs affects their reliability. Therefore, the first isolation circuit 42 of this application can be a first isolation circuit 42 based on a capacitive chip. The capacitive chip transmits signals through an electric field, offering high reliability, and the SiO2 used in the capacitive chip has stronger insulation advantages. Figure 4 The first isolation circuit 42 based on the isolation chip is used in the middle.

[0094] In one specific embodiment of the present invention, the voltage divider filter circuit 41 may include:

[0095] The first terminal serves as the input terminal of the voltage divider filter circuit 41, and the second terminal is connected to the first resistor R1, which is connected to the first terminal of the second resistor R2.

[0096] The second end is connected to the first end of the third resistor R3 and the first end of the first capacitor C1 respectively, and the connection end serves as the second resistor R2 at the output end of the voltage divider filter circuit 41.

[0097] The third resistor R3 is grounded at its second end;

[0098] The first capacitor C1 with its second terminal grounded.

[0099] The voltage divider filter circuit 41 in this embodiment has high reliability. Voltage division can be achieved through the first resistor R1, the second resistor R2 and the third resistor R3, while the first capacitor C1 can achieve filtering.

[0100] For further information, please refer to Figure 4 It may also include:

[0101] The negative terminal is connected to the second end of the first resistor R1 and the first end of the second resistor R2, respectively, and the positive terminal is grounded.

[0102] TVS diode D3 has its negative terminal connected to the first end of the first resistor R1 and its positive terminal grounded.

[0103] The TVS diode D3 can effectively prevent the impact of surge current, while the Zener diode D4 can further stabilize the voltage, ensuring that the voltage level transmitted to the first isolation circuit 42 meets the requirements of the first isolation circuit 42.

[0104] In one specific embodiment of the present invention, it further includes:

[0105] A second isolation circuit 50 is provided between the controller 30 and the drive circuit 10.

[0106] Similar to the first isolation circuit 42, the second isolation circuit 50 in this embodiment can be based on the second isolation circuit 50 of the accelerator chip, which has high reliability and stronger insulation advantages.

[0107] The specific circuit configurations of the first isolation circuit 42 and the second isolation circuit 50 can be set as needed. For example, in a specific application, a four-channel isolation chip ISOW7840FDWE can be selected, which has a 5000V isolation withstand voltage and can generate a 3.3V voltage and a 75mA load current from a 3.3V primary voltage. Figure 3 In this implementation, the second isolation circuit 50 is powered by the first isolation circuit 42. The ISOW7840FDWE is an isolation chip that can generate isolated power, meaning that there is no need to provide an additional isolated power supply, which helps to reduce costs.

[0108] Applying the technical solution provided by the embodiments of the present invention, considering that the inaccuracy of relay contact state detection in traditional solutions is often due to abnormalities in the detection device itself, the relay contact detection device of this application can not only detect whether the first contact and the second contact of the relay under test are in a conducting state or a closed state, but also use the self-test circuit 20 to determine whether the relay contact detection device itself can pass the self-test.

[0109] Specifically, the drive circuit 10 can output the first electrical signal according to the control rules of the controller 30. When the self-test circuit 20 is in self-test mode, the self-test circuit 20 will transmit the first electrical signal to the input channel acquisition circuit 40 and transmit the received power from the second power supply V2 to the controller 30. Therefore, when the controller 30 receives the power from the second power supply V2 and receives the first electrical signal through the input channel acquisition circuit 40, it can determine that the relay contact detection device has passed the self-test. When the self-test circuit 20 is in a non-self-test state, it transmits a first electrical signal to the first contact of the relay under test. After the controller 30 controls the self-test circuit 20 to be in a non-self-test state, it determines whether the first electrical signal is received through the input channel acquisition circuit 40. If yes, it determines that the first and second contacts of the relay under test are in a conducting state; if no, it determines that the first and second contacts of the relay under test are in a closed state. In other words, when the self-test circuit 20 is in a non-self-test state, the relay contact detection device of this application can realize the continuity detection between the first and second contacts of the relay under test.

[0110] In summary, since the solution of this application can perform self-testing on the relay contact detection device, it can avoid the situation where the contact status detection of the relay under test is inaccurate due to the abnormality of the relay contact detection device itself. That is, this application is beneficial to effectively improve the accuracy of detecting the relay contact status.

[0111] Corresponding to the above embodiments of the relay contact detection device, this embodiment of the invention also provides a train signal control system, which may include the relay contact detection device as in any of the above embodiments, and can be referred to in correspondence with the above.

[0112] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0113] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0114] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A relay contact detection device, characterized in that, include: A drive circuit connected to the controller and the first power supply is used to receive electrical energy from the first power supply and output a first electrical signal according to the control rules of the controller. A self-test circuit, connected to the drive circuit, the controller, the second power supply, the input channel acquisition circuit, and the first contact of the relay under test, is used to transmit the first electrical signal to the input channel acquisition circuit and transmit the received power from the second power supply to the controller when it is in a self-test state; and to transmit the first electrical signal to the first contact of the relay under test when it is not in a self-test state. The controller, connected to the input channel acquisition circuit, is configured to, after controlling the self-test circuit to be in self-test mode, determine that the relay contact detection device has passed self-test when it receives electrical energy from the second power supply and receives the first electrical signal through the input channel acquisition circuit; after controlling the self-test circuit to be in non-self-test mode, determine whether the first electrical signal is received through the input channel acquisition circuit; if yes, determine that the first contact and the second contact of the relay under test are in a conducting state; if no, determine that the first contact and the second contact of the relay under test are in a closed state. The input channel acquisition circuit is connected to the second contact of the relay under test; The self-test circuit includes a first relay; The first and second ends of the control coil of the first relay are respectively connected to the positive terminal of the third power supply and the controller. The moving end of the first controlled branch of the first relay is connected to the output terminal of the drive circuit. The first and second stationary ends of the first controlled branch of the first relay are respectively connected to the first contact of the relay under test and the input channel acquisition circuit. The moving end of the second controlled branch of the first relay is connected to the second power supply. The first stationary end of the second controlled branch of the first relay is left floating. The second stationary end of the second controlled branch of the first relay is connected to the controller.

2. The relay contact detection device according to claim 1, characterized in that, The first electrical signal is a pulse signal whose duty cycle is controlled by the controller.

3. The relay contact detection device according to claim 1, characterized in that, The controller is specifically used to control the self-test circuit to a self-test state according to a preset cycle.

4. The relay contact detection device according to claim 1, characterized in that, The controller is also used for: When it is determined that the relay contact detection device has failed the self-test, the first prompt message is output.

5. The relay contact detection device according to claim 1, characterized in that, Also includes: A first diode is connected in series between the first contact of the relay under test and the self-test circuit, and the cathode of the first diode is connected to the first contact of the relay under test.

6. The relay contact detection device according to claim 1, characterized in that, Also includes: A second diode is connected in series between the self-test circuit and the input channel acquisition circuit, and the cathode of the second diode is connected to the input channel acquisition circuit.

7. The relay contact detection device according to claim 1, characterized in that, The input channel acquisition circuit includes: The input terminal serves as the input terminal of the input channel acquisition circuit, which is a voltage divider filter circuit. The input terminal is connected to the output terminal of the voltage divider filter circuit, and the output terminal serves as the first isolation circuit for the output terminal of the input channel acquisition circuit.

8. The relay contact detection device according to claim 7, characterized in that, The first isolation circuit is a first isolation circuit based on a capacitor chip.

9. The relay contact detection device according to claim 7, characterized in that, The voltage divider filter circuit includes: The first terminal serves as the input terminal of the voltage divider filter circuit, and the second terminal is connected to the first resistor at the first terminal of the second resistor. The second end is connected to the first end of the third resistor and the first end of the first capacitor respectively, and the connection end serves as the second resistor at the output end of the voltage divider filter circuit. The third resistor with its second terminal grounded; The first capacitor with its second terminal grounded.

10. The relay contact detection device according to claim 9, characterized in that, Also includes: A Zener diode with its negative terminal connected to the second end of the first resistor and the first end of the second resistor, and its positive terminal grounded; A TVS diode with its negative terminal connected to the first end of the first resistor and its positive terminal grounded.

11. The relay contact detection device according to claim 1, characterized in that, Also includes: A second isolation circuit is provided between the controller and the drive circuit.

12. The relay contact detection device according to claim 1, characterized in that, Also includes: An isolation power supply circuit is provided between the drive circuit and the first power supply.

13. The relay contact detection device according to claim 1, characterized in that, The driving circuit includes: The first end is connected to the controller and serves as the control end of the drive circuit. The second end is connected to the control end of the first switching transistor, the first end of the fifth resistor, and the first end of the second capacitor, respectively, as a fourth resistor. The fifth resistor with its second terminal grounded; The second capacitor with its second terminal grounded; The first switch transistor has its first terminal connected to the first terminal of the sixth resistor and its second terminal grounded. The sixth resistor, whose second end is connected to the first end of the seventh resistor and the control end of the second switch transistor respectively; The seventh resistor, whose second end is connected to the second end of the second switching transistor, and whose connection end is connected to the first power supply as the input end of the driving circuit; The second switching transistor has its first terminal serving as the output terminal of the driving circuit.

14. A train signal control system, characterized in that, Includes the relay contact detection device as described in any one of claims 1 to 13.

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