Nuclear power plant analog signal redundant output board card switching device and electronic equipment

Abstract

The application is suitable for the field of nuclear power technology, and provides a nuclear power station analog signal redundant output board card switching device and electronic equipment, wherein the output board card switching device comprises a relay module, a first analog output board card, a second analog output board card, a switching quantity output board card and a main control module; the main control module forms a first power supply circuit with the first analog output board card, a relay switch and a power consumption module, and forms a second power supply circuit with the second analog output board card, the relay switch and a matching resistance module; when the main control module detects that the first power supply circuit is disconnected and the second power supply circuit is normally working, the main control module makes the second analog output board card supply power to the power consumption module through the relay switch; the technical scheme can monitor the running state of the main power supply circuit in real time, can automatically switch to the standby power supply circuit when the main power supply circuit fails, and ensures that the main power consumption module normally works.

Description

Technical Field

[0001] This application relates to the field of nuclear power technology, and in particular to a switching device and electronic equipment for a redundant output board of analog signals in a nuclear power plant. Background Technology

[0002] In nuclear power plant control systems, analog output (AO) signals are widely used in critical actuators such as regulating valves and pumps. Traditional designs often employ single-channel AO modules for signal output. When the AO module experiences a disconnection, communication failure, or hardware malfunction, it will be unable to continuously output analog signals to downstream equipment, potentially causing critical equipment such as pressurizer spray valves and evaporator feedwater flow control valves to malfunction. This single point of failure mechanism severely impacts the safety and stability of nuclear power units. Although existing technologies mitigate the risk by setting default output values ​​or alarm mechanisms, the problem of critical analog signals failing to output correctly still exists. Utility Model Content

[0003] This utility model provides a switching device and electronic equipment for redundant output boards of analog signals in nuclear power plants, in order to solve the problem in the prior art that when a single-channel AO module is used for signal output, the analog signal cannot be output normally to downstream equipment when the AO module fails.

[0004] The first aspect of this utility model provides a switching device for redundant output boards of analog signals in a nuclear power plant, comprising:

[0005] A relay module includes a relay switch and an induction coil, wherein the output terminal of the relay switch is connected to the power consumption module and the matching resistor module respectively;

[0006] The first analog output board has its input and output terminals connected to the first set of switching terminals of the relay switch, respectively.

[0007] The second analog output board has its input and output terminals connected to the second set of switching terminals of the relay switch, respectively.

[0008] A digital output board, the output of which is connected to the control terminal of the induction coil;

[0009] The main control module is connected to the first analog output board, the second analog output board, and the digital output board, respectively.

[0010] The main control module is used to control the switch output board to output a first control signal to the induction coil, so that the first analog output board, the relay switch and the power consumption module form a first power supply circuit, and the second analog output board, the relay switch and the matching resistor module form a second power supply circuit.

[0011] The main control module is also used to detect when the first power supply circuit is open and the second power supply circuit is working normally, and output a second control signal to the induction coil through the switch output board, so that the second analog output board supplies power to the power module through the relay switch.

[0012] Furthermore, the first set of switching terminals includes a first normally closed contact, a second normally closed contact, a third normally closed contact, and a fourth normally closed contact; the second set of switching terminals includes a first normally open contact, a second normally open contact, a third normally open contact, and a fourth normally open contact; the output terminal of the relay module includes a first common contact, a second common contact, a third common contact, and a fourth common contact.

[0013] The output terminals of the first analog output board are respectively connected to the first normally closed contact and the third normally open contact. The input terminals of the first analog output board are respectively connected to the second normally closed contact and the fourth normally open contact. The output terminals of the second analog output board are respectively connected to the first normally open contact and the third normally closed contact. The input terminals of the second analog output board are respectively connected to the second normally open contact and the fourth normally closed contact. The first common contact is connected to the first terminal of the power module. The second common contact is connected to the second terminal of the power module. The third common contact is connected to the first terminal of the matching resistor module. The fourth common contact is connected to the second terminal of the matching resistor module.

[0014] Furthermore, when the induction coil receives the first control signal, it controls the relay switch to perform a first action, connecting the first normally closed contact with the first common contact, connecting the second normally closed contact with the second common contact, connecting the third normally closed contact with the third common contact, and connecting the fourth normally closed contact with the fourth common contact.

[0015] Furthermore, the first analog output board, the first normally closed contact, the first common contact, the power module, the second common contact, and the second normally closed contact form a first power supply circuit;

[0016] The second analog output board, the third normally closed contact, the third common contact, the matching resistor module, the fourth common contact, and the fourth normally closed contact form the second power supply circuit.

[0017] Furthermore, when the induction coil receives the second control signal, it controls the relay switch to perform a second action, connecting the first normally open contact with the first common contact, connecting the second normally open contact with the second common contact, connecting the third normally open contact with the third common contact, and connecting the fourth normally open contact with the fourth common contact.

[0018] Furthermore, the second analog output board, the first normally open contact, the first common contact, the power module, the second common contact, and the second normally open contact form a third power supply circuit;

[0019] The first analog output board, the third normally open contact, the third common contact, the matching resistor module, the fourth common contact, and the fourth normally open contact form the fourth power supply circuit.

[0020] Furthermore, the power module is a regulating valve, the current input terminal of the regulating valve is the first terminal of the power module, and the current output terminal of the regulating valve is the second terminal of the power module.

[0021] Furthermore, the matching resistor module is a current-limiting resistor, with the first end of the current-limiting resistor being the first end of the matching resistor module and the second end of the current-limiting resistor being the second end of the matching resistor module.

[0022] Furthermore, the output board switching device also includes a backup control module, which is connected to the first analog output board, the second analog output board, and the digital output board.

[0023] A second aspect of this utility model provides an electronic device, including the nuclear power plant analog signal redundancy output board switching device, power module, and matching resistor module described in the first aspect.

[0024] The technical advantages of this utility model embodiment are as follows: This technical solution addresses the problems of traditional single-channel outputs being prone to single-point failures and difficulty in achieving automatic redundancy switching. It sets up a redundant output board switching device including a relay module, a main control module, dual analog output boards, and digital output boards. By setting up a relay module with normally closed and normally open contacts, and with the main control module monitoring the operating status of the main power supply circuit in real time, it can automatically switch to the backup power supply circuit when the main power supply circuit fails, ensuring the normal operation of critical power modules. This not only achieves fault detection of analog signal output but also ensures continuous monitoring of the status of the backup analog output board through the backup power supply circuit design, thereby significantly improving the reliability and safety of the nuclear power control system and effectively avoiding the problem of critical power modules failing to operate due to analog signal output interruptions. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the first structure of a nuclear power plant analog signal redundancy output board switching device according to Embodiment 1 of this utility model;

[0027] Figure 2 This is a schematic diagram of the first working state of a nuclear power plant analog signal redundancy output board switching device in Embodiment 1 of this utility model;

[0028] Figure 3 This is a schematic diagram of the second working state of a nuclear power plant analog signal redundancy output board switching device in Embodiment 1 of this utility model;

[0029] Figure 4 This is a schematic diagram of the second structure of a nuclear power plant analog signal redundancy output board switching device in Embodiment 1 of this utility model;

[0030] Figure 5 This is a schematic diagram of the working status of the backup control module in a nuclear power plant analog signal redundancy output board switching device according to Embodiment 1 of this utility model.

[0031] In the diagram: 101, Relay module; 102, First analog output board; 103, Second analog output board; 104, Switch output board; 105, Main control module; 106, Backup control module; 111, Relay switch; 112, Induction coil; 201, Power consumption module; 202, Matching resistor module. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0033] It should be understood that, when used in this specification and appended claims, unless otherwise stated, the term " / " means "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, in the description of the embodiments in this application, "multiple" refers to two or more.

[0034] In the description of this utility model specification and the appended claims, the term "comprising" indicates the presence of a described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. It should also be understood that the term "and / or" as used in this utility model specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0035] Furthermore, in the description of this utility model specification and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0037] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this utility model embodiment.

[0038] To facilitate a further understanding of the technical solutions in some embodiments of this application, the technical solutions of the analog signal redundancy output board switching device and electronic equipment for nuclear power plants, and how these solutions solve the aforementioned technical problems, are described in detail below with reference to specific embodiments and accompanying drawings. The embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application.

[0039] In some embodiments, such as Figure 1 As shown, a switching device for redundant output boards of analog signals in a nuclear power plant is provided, comprising:

[0040] The relay module 101 includes a relay switch 111 and an induction coil 112. The output terminal of the relay switch 111 is connected to the power consumption module 201 and the matching resistor module 202 respectively.

[0041] The first analog output board 102 has its input and output terminals connected to the first set of switching terminals of the relay switch 111, respectively.

[0042] The second analog output board 103 has its input and output terminals connected to the second set of switching terminals of the relay switch 111, respectively.

[0043] The output board 104 is connected to the control terminal of the induction coil 112.

[0044] The main control module 105 is connected to the first analog output board 102, the second analog output board 103 and the digital output board 104 respectively.

[0045] The main control module 105 is used to control the switch output board 104 to output a first control signal to the induction coil 112, so that the first analog output board 102, the relay switch 111 and the power module 201 form a first power supply circuit, and the second analog output board 103, the relay switch 111 and the matching resistor module 202 form a second power supply circuit.

[0046] The main control module 105 is also used to detect when the first power supply circuit is open and the second power supply circuit is working normally, and output a second control signal to the induction coil 112 through the switch output board 104, so that the second analog output board 103 supplies power to the power module 201 through the relay switch 111.

[0047] The relay module 101 includes a relay switch 111 and an induction coil 112. When a control signal is received from the switch output board 104, the induction coil 112 is energized or de-energized, thereby driving the relay switch 111 to switch. The relay switch 111 closes its normally closed or normally open contacts with a common contact according to the coil's energization state, completing the switching between different analog output boards and the key power-consuming module. The output terminal of the relay module 101 is connected to a field device, which may be a valve module or an equipment module. The output terminal of the relay module 101 is also connected to a matching resistor module 202 to select the power supply path. The function of the first analog output board 102 is to output a current signal, serving as the main signal source. The output analog signal is provided to the power-consuming module 201 through the relay switch 111. When the relay module 101 is not switched (i.e., the induction coil 112 is not energized), its output analog signal is connected to the power-consuming module 201 through a normally closed contact, and the power-consuming module 201 is in a working state. The second analog output board 103 outputs the same type of analog signal as the first analog output board 102, serving as a redundant backup signal source. The second analog output board 103 is typically not connected to the power consumption module 201; it is only switched in by the relay module 101 after a fault occurs in the first analog output board 102. The connection is established with the power consumption module 201 through the normally open contact of the relay module 101, forming a redundant power supply path. The function of the digital output board 104 (DO board) is to output a high or low level control signal to the induction coil 112 in the relay module 101, controlling the relay switch 111 inside the relay module 101 to switch the analog output path between the main and backup power supply circuits. The AO (ANALOG OUTPUT) board provides the same analog signal, for example, outputting the same current signal, while the DO (DIGITAL OUTPUT) board outputs a digital signal, controlling the digital switch of the induction coil 112 to achieve power on or off. The excitation condition of the induction coil of relay module 101 is controlled by the control signal output by the switch output board 104. For example, when the control signal is 0, relay module 101 is de-energized, induction coil 112 is in a de-energized state, and normally closed contacts remain closed. When the control signal is 1, relay module 101 is energized, induction coil 112 is in an energized state, and normally open contacts are closed.Two AO boards each output two wires to the relay module 101. The first analog output board 102 is a commonly used output board connected to the normally closed contact of the relay module 101. Under normal circumstances, the first analog output board 102 outputs a signal to the power consumption module 201. For example, if the power consumption module 201 is a valve positioner, the first analog output board 102 outputs a 4-20mA current signal to provide control current to the valve positioner. When the first analog output board 102 fails, the relay module 101 is energized to switch to the second analog output board 103 to output an analog signal to the power consumption module 201. The main control module 105 is used to collect and monitor the status of the first power supply circuit and the second power supply circuit in real time (such as circuit current, voltage or signal validity). When the first power supply circuit is detected to be open and the second power supply circuit is working normally, it indicates that the first analog output board 102 has failed and cannot continuously provide analog signals to the power consumption module 201. The second analog output board 103 is working normally and can output analog signals. The main control module 105 controls the switch output board 104 to output a switching signal and controls the switch output board 104 to issue a second control signal to switch the relay module 101 so that the second analog output board 103 supplies power to the power consumption module 201 through the relay module 101.

[0048] Taking the power module 201 as a valve as an example, the working process of this embodiment is as follows:

[0049] 1. Normal operation phase: The main control module 105 controls the switch output board 104 to output the first control signal (00 digital signal). The relay module 101 is in a de-energized state. At this time, the normally closed contact of the relay switch 111 is closed. The first analog output board 102 outputs a current signal to the valve through the relay module 101 to form the first power supply circuit. The second analog output board 103 is also in the output state and forms the second power supply circuit with the matching resistor module 202. The second power supply circuit is connected but does not participate in the output of the valve in the first power supply circuit.

[0050] 2. Real-time monitoring phase: The main control module 105 continuously monitors the status of the first power supply circuit, such as circuit current, load feedback or AO signal status, to determine whether the first power supply circuit is working properly.

[0051] 3. Fault detection and switching triggering stage: When the main control module 105 detects a fault such as disconnection, communication interruption or output abnormality (e.g. no current, output over-limit) in the first analog output board 102 or its connection circuit, and confirms that the second power supply circuit is working normally, the main control module 105 controls the digital output board 104 to output the second control signal (11 digital signal).

[0052] 4. Backup power supply circuit power supply stage: The relay module 101 induction coil 112 is energized, the relay switch 111 switches from normally closed to normally open and closes, the second analog output board 103 outputs a current signal to the valve through the relay module 101, realizes the automatic replacement of the first power supply circuit by the backup power supply circuit, and ensures that the current signal output to the power consumption module 201 is not interrupted.

[0053] 5. Fault recovery phase: Maintain power supply in the backup power supply circuit. If the first analog output board 102 is repaired, the system can automatically restore or manually confirm the switch back to power supply to the first analog output board 102 according to the system settings to ensure operational safety.

[0054] The technical advantages of this utility model embodiment are as follows: by setting up a relay module with normally closed and normally open contacts, and having the main control module monitor the operating status of the main power supply circuit in real time, it can automatically switch to the backup power supply circuit when the main power supply circuit fails, ensuring the normal operation of critical power modules; it not only realizes fault detection of analog signal output, but also ensures continuous monitoring of the status of backup analog output boards through the backup power supply circuit design, thereby greatly improving the reliability and safety of the nuclear power control system and effectively avoiding the problem of important power modules failing to work due to interruption of analog signal output.

[0055] As one implementation method, such as Figure 2 As shown, the first set of switching terminals includes a first normally closed contact A1, a second normally closed contact A2, a third normally closed contact A3, and a fourth normally closed contact A4; the second set of switching terminals includes a first normally open contact B1, a second normally open contact B2, a third normally open contact B3, and a fourth normally open contact B4; the output terminals of the relay module 101 include a first common contact C1, a second common contact C2, a third common contact C3, and a fourth common contact C4; the output terminals of the first analog output board 102 are respectively connected to the first normally closed contact A1 and the third normally open contact B3. The input terminals are connected to the second normally closed contact A2 and the fourth normally open contact B4, respectively. The output terminals of the second analog output board 103 are connected to the first normally open contact B1 and the third normally closed contact A3, respectively. The input terminals of the second analog output board 103 are connected to the second normally open contact B2 and the fourth normally closed contact A4, respectively. The first common contact C1 is connected to the first terminal of the power module 201, the second common contact C2 is connected to the second terminal of the power module 201, the third common contact C3 is connected to the first terminal of the matching resistor module 202, and the fourth common contact C4 is connected to the second terminal of the matching resistor module 202.

[0056] The first set of switching terminals includes a first normally closed contact A1, a second normally closed contact A2, a third normally closed contact A3, and a fourth normally closed contact A4. These normally closed contacts remain closed when the relay module 101 is de-energized. They are used to connect the signal output of the first analog output board 102 to the common contact of the relay module 101, enabling it to normally provide analog signals to the power consumption module 201. The second set of switching terminals includes a first normally open contact B1, a second normally open contact B2, a third normally open contact B3, and a fourth normally open contact B4. These normally open contacts close when the relay module 101 is energized (the induction coil is energized). They are used to introduce the output signal of the second analog output board 103 to the common contact of the relay module 101, replacing the first analog output board 102 in supplying power to the power consumption module. The output terminals of the relay module 101 include a first common contact C1, a second common contact C2, a third common contact C3, and a fourth common contact C4, which are respectively connected to two terminals of the power consumption module 201 and the matching resistor module 202. They are used to receive analog signals from the first analog output board 102 or the second analog output board 103, and output them to the power consumption module 201 after being turned on by normally closed or normally open contacts.

[0057] When the induction coil 112 receives the first control signal, it controls the relay switch 111 to perform a first action, thereby connecting the first normally closed contact A1 and the first common contact C1, the second normally closed contact A2 and the second common contact C2, the third normally closed contact A3 and the third common contact C3, and the fourth normally closed contact A4 and the fourth common contact C4. The first analog output board 102, the first normally closed contact A1, the first common contact C1, the power module 201, the second common contact C2, and the second normally closed contact A2 form a first power supply circuit; the second analog output board 103, the third normally closed contact A3, the third common contact C3, the matching resistor module 202, the fourth common contact C4, and the fourth normally closed contact A4 form a second power supply circuit.

[0058] The first power supply circuit is the system's default main power supply circuit. It closes when the relay module 101 is not energized (the induction coil 112 receives the first control signal but is not powered). It uses the normally closed contacts of the relay module 101 to construct a complete current loop, forming a closed path between the first analog output board 102 and the power consumption module 201. This enables the first analog output board 102 to output a current signal (such as a regulating valve current control signal of 4-20mA) to the power consumption module 201. The second power supply circuit is usually closed simultaneously with the main current circuit, but its output is not connected to the power consumption module 201. The second analog output board 103 is used to provide the same current signal as the main current circuit to the matching resistor module 202, and can serve as a redundant signal output module after a failure in the main current circuit.

[0059] The technical advantages of this embodiment are as follows: it realizes the independent output of the first power supply circuit and the second power supply circuit under the same working state. The first power supply circuit is used to realize the main power supply task and ensure the stable transmission of current signal. The second power supply circuit outputs a signal to the independent matching resistor module 202 in real time, so that the main control module 105 can detect the status of the second power supply circuit. This not only improves the ability to guarantee the output of key current signals, but also has the ability to quickly respond to fault identification and redundant takeover, which significantly enhances the safety, reliability and maintainability of the control system.

[0060] like Figure 3 As shown, when the induction coil 112 receives the second control signal, it controls the relay switch 111 to perform a second action, connecting the first normally open contact B1 and the first common contact C1, the second normally open contact B2 and the second common contact C2, the third normally open contact B3 and the third common contact C3, and the fourth normally open contact B4 and the fourth common contact C4. The second analog output board 103, the first normally open contact B1, the first common contact C1, the power module 201, the second common contact C2, and the second normally open contact B2 form a third power supply circuit; the first analog output board 102, the third normally open contact B3, the third common contact C3, the matching resistor module 202, the fourth common contact C4, and the fourth normally open contact B4 form a fourth power supply circuit.

[0061] When the induction coil 112 receives the second control signal and the relay module 101 is energized, the third power supply circuit is activated. This circuit is used to ensure that, in the event of a fault in the first analog output board 102, the second analog output board 103 outputs an analog signal to the power consumption module 201. The normally open contact of the relay module 101 closes, connecting the analog signal output by the second analog output board 103 to the power consumption module 201, forming a complete current loop. The fourth power supply circuit closes when the relay module 101 performs the second action, establishing an analog signal path from the output signal of the first analog output board 102 to the matching resistor module 202. Under normal operating conditions, this path is not used as a working path but is used to detect the first analog output board 102. It can be used to cross-verify whether the output channel is normal, and can also be used for maintaining the state or recording data after redundancy switching.

[0062] The technical advantages of this embodiment are as follows: When a fault occurs in the main power supply circuit, the system can automatically switch to the third power supply circuit via the normally open contact of the relay module 101, enabling the second analog output board 103 to output analog signals to the power consumption module 201, thus ensuring the normal operation of the critical power consumption module. Simultaneously, the introduction of a fourth power supply circuit allows the first analog output board 102 to still output signals to the matching resistor module 202 in standby mode, enabling the detection of the first analog output board 102. This achieves bidirectional redundancy and cross-validation, significantly improving the response capability and diagnosability of the control system under abnormal conditions, and effectively enhancing the control reliability in high-safety-level application scenarios such as nuclear power plants.

[0063] As one implementation method, such as Figure 2 As shown, the power module 201 is a regulating valve F1. The current input terminal of the regulating valve F1 is the first terminal of the power module 201, and the current output terminal of the regulating valve F1 is the second terminal of the power module 201.

[0064] The power module 201 is a regulating valve F1, used to receive control current signals from the analog output board and drive the valve to perform opening and closing operations based on these signals. The regulating valve F1 typically uses current control, such as a 4-20mA current signal, to achieve precise control of the valve's opening and closing state. The current input terminal of the regulating valve F1 serves as the first terminal of the power module 201, used to receive the current signal output from the first analog output board 102; the current output terminal serves as the second terminal of the power module 201, used to return the current to the first analog output board 102, forming a complete current closed loop. This module is often used in nuclear power plant control systems to control critical actuators such as pressurizer spray valves and evaporator feedwater flow control valves. The stability of the received current signal directly affects the safety and reliability of the system operation. This embodiment uses a redundant switching structure to ensure that the module can still receive current signals in the event of a main power supply circuit failure, thereby avoiding malfunction.

[0065] In one implementation, the matching resistor module 202 is a current-limiting resistor R1, with the first end of the current-limiting resistor R1 being the first end of the matching resistor module 202 and the second end of the current-limiting resistor R1 being the second end of the matching resistor module 202.

[0066] The matching resistor module 202 is a current-limiting resistor R1. Its first and second terminals correspond to the first and second terminals of the matching resistor module 202, respectively. It provides a continuous closed current loop for the power supply circuit when the second analog output board 103 is not connected to the main power module. Since the analog output board requires a closed-loop current path for output, the main control module 105 can monitor whether it is in a normal output state. If the loop is open, the main control module 105 will misjudge the analog output board as faulty, causing the redundancy switching mechanism to fail. By setting a current-limiting terminating resistor with a matching resistance value (e.g., 50Ω), the current characteristics of the actual load are simulated, ensuring that the backup analog output board maintains a closed output loop even when not connected to the main load, thus avoiding misjudgment as faulty. Simultaneously, after the switching action occurs, the main channel analog output board is also connected to this terminating resistor, achieving symmetry and detection consistency between the main and backup channel analog output boards. This design not only ensures the system correctly identifies the working status of the analog output board, but also provides reliable backup channel support for redundancy switching, thereby significantly improving the fault detection capability and redundancy switching reliability of the control system.

[0067] As one implementation method, such as Figure 4 and Figure 5 As shown, the output board switching device also includes a backup control module 106, which is connected to the first analog output board 102, the second analog output board 103 and the digital output board 104 respectively.

[0068] The backup control module 106 is used to receive control functions for the analog output channels and relay module 101 in the event of a failure or communication interruption of the main control module 105, ensuring the effective maintenance of the output of critical control signals and the redundancy switching capability. The backup control module 106 is connected to the first analog output board 102, the second analog output board 103, and the digital output board 104, respectively. It can acquire the working status of each channel in real time and, when the main control module 105 fails, determine whether the power supply circuit is normal based on the status information it has collected. When an open circuit, abnormal current, or signal loss is detected in the first power supply circuit, and the second power supply circuit is normal, the backup control module 106 can independently control the digital output board 104 to send a switching command (second control signal) to the relay module 101, driving the relay module 101 to perform a switching action, connecting the backup channel to the power consumption module 201, thereby achieving backup redundancy for the main control function. The introduction of this module further enhances the system's fault tolerance and control link redundancy, ensuring that the safety and controllability of the control system can still be maintained under extreme conditions, making it particularly suitable for scenarios with high reliability requirements such as nuclear power plants.

[0069] Example 2

[0070] This second embodiment provides an electronic device, including the nuclear power plant analog signal redundancy output board switching device, power module, and matching resistor module provided in the first embodiment.

[0071] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A switching device for redundant analog signal output boards in a nuclear power plant, characterized in that, include: A relay module includes a relay switch and an induction coil, wherein the output terminal of the relay switch is connected to the power consumption module and the matching resistor module respectively; The first analog output board has its input and output terminals connected to the first set of switching terminals of the relay switch, respectively. The second analog output board has its input and output terminals connected to the second set of switching terminals of the relay switch, respectively. A digital output board, the output of which is connected to the control terminal of the induction coil; The main control module is connected to the first analog output board, the second analog output board, and the digital output board, respectively. The main control module is used to control the switch output board to output a first control signal to the induction coil, so that the first analog output board, the relay switch and the power consumption module form a first power supply circuit, and the second analog output board, the relay switch and the matching resistor module form a second power supply circuit. The main control module is also used to detect when the first power supply circuit is open and the second power supply circuit is working normally, and output a second control signal to the induction coil through the switch output board, so that the second analog output board supplies power to the power module through the relay switch.

2. The nuclear power plant analog signal redundancy output board switching device according to claim 1, characterized in that, The first set of switching terminals includes a first normally closed contact, a second normally closed contact, a third normally closed contact, and a fourth normally closed contact; the second set of switching terminals includes a first normally open contact, a second normally open contact, a third normally open contact, and a fourth normally open contact; the output terminal of the relay module includes a first common contact, a second common contact, a third common contact, and a fourth common contact. The output terminals of the first analog output board are respectively connected to the first normally closed contact and the third normally open contact. The input terminals of the first analog output board are respectively connected to the second normally closed contact and the fourth normally open contact. The output terminals of the second analog output board are respectively connected to the first normally open contact and the third normally closed contact. The input terminals of the second analog output board are respectively connected to the second normally open contact and the fourth normally closed contact. The first common contact is connected to the first terminal of the power module. The second common contact is connected to the second terminal of the power module. The third common contact is connected to the first terminal of the matching resistor module. The fourth common contact is connected to the second terminal of the matching resistor module.

3. The nuclear power plant analog signal redundancy output board switching device according to claim 2, characterized in that, When the induction coil receives the first control signal, it controls the relay switch to perform a first action, connecting the first normally closed contact with the first common contact, connecting the second normally closed contact with the second common contact, connecting the third normally closed contact with the third common contact, and connecting the fourth normally closed contact with the fourth common contact.

4. The nuclear power plant analog signal redundancy output board switching device according to claim 3, characterized in that, The first analog output board, the first normally closed contact, the first common contact, the power module, the second common contact, and the second normally closed contact form a first power supply circuit; The second analog output board, the third normally closed contact, the third common contact, the matching resistor module, the fourth common contact, and the fourth normally closed contact form the second power supply circuit.

5. The nuclear power plant analog signal redundancy output board switching device according to claim 2, characterized in that, When the induction coil receives the second control signal, it controls the relay switch to perform a second action, connecting the first normally open contact with the first common contact, connecting the second normally open contact with the second common contact, connecting the third normally open contact with the third common contact, and connecting the fourth normally open contact with the fourth common contact.

6. The nuclear power plant analog signal redundancy output board switching device according to claim 5, characterized in that, The second analog output board, the first normally open contact, the first common contact, the power module, the second common contact, and the second normally open contact form a third power supply circuit; The first analog output board, the third normally open contact, the third common contact, the matching resistor module, the fourth common contact, and the fourth normally open contact form the fourth power supply circuit.

7. The nuclear power plant analog signal redundancy output board switching device according to any one of claims 1 to 6, characterized in that, The power module is a regulating valve, the current input terminal of the regulating valve is the first terminal of the power module, and the current output terminal of the regulating valve is the second terminal of the power module.

8. The nuclear power plant analog signal redundancy output board switching device according to any one of claims 1 to 6, characterized in that, The matching resistor module is a current-limiting resistor, the first end of the current-limiting resistor is the first end of the matching resistor module, and the second end of the current-limiting resistor is the second end of the matching resistor module.

9. The nuclear power plant analog signal redundancy output board switching device according to any one of claims 1 to 6, characterized in that, The output board switching device also includes a backup control module, which is connected to the first analog output board, the second analog output board, and the digital output board.

10. An electronic device, characterized in that, Includes the nuclear power plant analog signal redundancy output board switching device, power module, and matching resistor module as described in any one of claims 1-9.

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