Signal distribution device

Abstract

The utility model relates to the technical field of signal distribution equipment, in particular to a signal distribution device. A signal distribution device comprises at least two signal distribution loops, each signal distribution loop comprises a terminal and at least one signal sub-multiplication loop, and the terminal comprises a set of first input ends and first output ends and at least one set of second input ends and second output ends; all the signal multiplication loops are sequentially connected in series between the first input end and the second output end through the corresponding second input ends and second output ends; the terminal comprises at least one diode assembly; the diode assembly is connected in series with the first input end and the first output end; the first input end passes through the diode assembly or at least one group of second input ends, the second output end is conducted with the first output end, and a received signal is conducted from the first input end to the first output end. According to the utility model, seamless switching of the standby loop can be realized, and other redundant signal distribution loops are not influenced when the loop externally connected with the terminal fails or is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of signal distribution equipment, in particular to a signal distribution device. Background Art

[0002] In the CPR1000 nuclear power unit, it is often necessary to multiply a signal into multiple paths and send them to different components to participate in control and protection respectively.

[0003] Taking the turbine valve position feedback signal of the CPR1000 domestic turbine control system as an example, the 4-20mA valve position feedback signal sent to the turbine control cabinet on site needs to be sent to valve servo cards A and B, and analog input cards A and B respectively, a total of four paths. A and B are redundant with each other to realize the overall redundancy function of the control system. Therefore, a device that can multiply a 4-20mA signal into four 4-20mA signals is required to realize the analog signal distribution function. However, if there is a fault, maintenance or other abnormal conditions in the signal sent by one example of the existing multiplication device, it will affect the signal transmission of other columns. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is how to prevent the signal failure of a certain column from affecting the signal transmission of other columns. In view of the defects of the prior art, a signal distribution device is provided.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a signal distribution device includes at least two signal distribution loops. Each signal distribution loop includes a terminal and at least one signal sub-multiplication loop. The terminal includes a group of first input terminals and a first output terminal, and at least one group of second input terminals and second output terminals;

[0006] Each signal multiplication sub-loop is connected between a group of the second input terminals and the second output terminals. Each signal multiplication sub-loop and the corresponding second input terminal and second output terminal respectively form multiple signal multiplication loops;

[0007] All signal multiplication loops are sequentially connected in series between the first input terminal and the second output terminal through the corresponding second input terminals and second output terminals;

[0008] All signal distribution loops are sequentially connected in series through the first input terminal and the first output terminal of the corresponding terminal. The external input signal is sequentially transmitted between each signal distribution loop through the terminal;

[0009] In a signal distribution loop, the external input signal is sequentially transmitted between each signal sub-multiplication loop. Each signal sub-multiplication loop multiplies the external input signal to obtain multiple signals;

[0010] The terminal includes at least one diode component; the diode component is connected in series with the first input terminal and the first output terminal; the first input terminal is conducted to the first output terminal through the diode component or the at least one group of the second input terminal and the second output terminal, and the received signal is conducted from the first input terminal to the first output terminal.

[0011] Preferably, all the diode components are connected in parallel with all the signal sub-multiplier circuits.

[0012] Preferably, the diode component includes at least two diode elements; the diode elements are connected end to end in series; the positive electrode of the first diode element of the diode component is connected to the first input terminal; the negative electrode of the last diode element of the diode component is connected to the first output terminal.

[0013] Preferably, the conduction voltage of the diode component is less than the terminal voltage of the terminal.

[0014] Preferably, the terminal is a two-in-two-out terminal, including a group of the first input terminal and the first output terminal, and a group of the second input terminal and the second output terminal; it is connected to one signal sub-multiplier circuit; the positive input terminal of the signal sub-multiplier circuit is connected to the second output terminal; the negative input terminal of the signal sub-multiplier circuit is connected to the second input terminal; the first input terminal is connected to the positive electrode of the diode component and the second input terminal; the first output terminal is connected to the negative electrode of the diode component and the second output terminal.

[0015] Preferably, the conduction voltage of the diode component is higher than the operating voltage of the signal sub-multiplier circuit.

[0016] Preferably, the signal sub-multiplier circuit includes a signal multiplier; the signal multiplier is a one-to-two signal multiplier; the input terminal of the signal multiplier is connected to the second input terminal and the second output terminal; the output terminal of the signal multiplier is connected to an external device.

[0017] Preferably, each group of the second input terminal and the second output terminal is connected to a diode component, and the diode component is connected in parallel with the corresponding signal sub-multiplier circuit;

[0018] The second input terminal is conducted to the second output terminal through the diode component or the signal sub-multiplier circuit, and the received signal is conducted from the second input terminal to the second output terminal.

[0019] Preferably, the diode assembly includes at least two diode elements; the diode elements are connected in series; the positive electrode of the first diode element of the diode assembly is connected to the corresponding second input terminal; the negative electrode of the last diode element of the diode assembly is connected to the corresponding second output terminal;

[0020] In a group of second input terminals and second output terminals, an external input signal is transmitted from the second input terminal to the second output terminal through the signal sub-multiplication circuit or the diode assembly.

[0021] Preferably, the number of signal sub-multiplication circuits in the signal distribution circuit is less than or equal to the total number of groups of the second input terminals and the second output terminals.

[0022] Implementing the present utility model has the following beneficial effects:

[0023] By providing a diode assembly between the input terminal and the output terminal of the terminal in the present utility model, and utilizing the threshold voltage principle of the diode, when the circuit externally connected to the terminal is open, the input terminal and the output terminal of the terminal can be conducted through the diode, so as not to affect the transmission of downstream signals, enabling seamless switching of the standby circuit, and realizing that when the circuit externally connected to the terminal fails or is under maintenance, it does not affect other redundant signal distribution circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0025] Figure 1 It is a schematic diagram of the signal distribution circuit of the signal distribution device in an embodiment;

[0026] Figure 2 It is a schematic diagram of the signal distribution circuit in an embodiment;

[0027] Figure 3 It is a schematic diagram of the diode assembly in an embodiment;

[0028] Figure 4 It is a schematic diagram of the terminal structure in an embodiment;

[0029] Figure 5 It is a schematic diagram of the structure of the signal distribution device in an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the drawings.

[0031] A component is said to be "fixed to" or "disposed on" another component, and it can be located directly or indirectly on that other component. When a component is said to be "connected to" another component, it can be directly or indirectly connected to that other component.

[0032] The orientations or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the drawings.

[0033] The terms "axial direction" and "radial direction" refer to the length direction of the entire device or component as the "axial direction", and the direction perpendicular to the axial direction is the "radial direction".

[0034] The terms "first", "second", etc. are only for convenience of description and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0035] The above terms are only for convenience of description and should not be construed as limiting the technical solution.

[0036] A signal distribution device provided by an embodiment of the present utility model.

[0037] Figure 1 It is a schematic diagram of a signal distribution device in an embodiment. Figure 2 It is a schematic diagram of the internal structure of a terminal in an embodiment, where 101 is the first input end, 102 is the first output end, 103 is the second input end, and 104 is the second output end. As Figure 1 and Figure 2 shown, the signal distribution device includes at least two signal distribution loops, and each signal distribution loop includes a terminal and at least one signal sub-multiplication loop. The terminal includes a group of first input ends and first output ends, and at least one group of second input ends and second output ends.

[0038] Specifically, a terminal can have multiple signal sub-multiplication loops. Each signal sub-multiplication can achieve signal multiplication.

[0039] Each signal multiplication sub-loop is connected between a group of second input ends and second output ends, and each signal multiplication sub-loop and the corresponding second input ends and second output ends respectively form multiple signal multiplication loops.

[0040] Specifically, the signal multiplication sub-loop can be connected between two adjacent second input ends and second output ends, or can be connected across groups between the second input ends and second output ends. It is specifically determined according to the needs of the usage scenario.

[0041] All signal multiplication circuits are serially connected between the first input end and the second output end in sequence through corresponding second input ends and second output ends.

[0042] It should be noted that the serial connection form can control the signal multiplication sub-circuits in terms of terminals. And the internal structure of the terminals is simpler to construct because the components are linearly connected in a circuit. At the same time, there is no need to add multi-winding transformers to the terminals, reducing the material cost.

[0043] All signal distribution circuits are serially connected in sequence through the first input end and the first output end of the corresponding terminals, and the external input signal is sequentially transmitted between the signal distribution circuits through the terminals.

[0044] By connecting the output end of each circuit to the input end of the next circuit to form a signal transmission chain, it can ensure that the signal is sequentially transmitted to the target device.

[0045] In a signal distribution circuit, the external input signal is sequentially transmitted between the signal sub-multiplication circuits, and each signal sub-multiplication circuit multiplies the external input signal to obtain multiple signals.

[0046] The terminal includes at least one diode component. The diode component is serially connected with the first input end and the first output end. The first input end is conducted to the first output end through the diode component or at least one group of second input ends and second output ends, and the received signal is conducted from the first input end to the first output end.

[0047] Specifically, a diode component may include multiple diodes and other electronic components. Using the threshold voltage principle of the diode, when the signal distribution circuit is working normally, the threshold voltage of the diode component is used to bypass the diode. When the signal distribution circuit of the terminal is removed or repaired, the threshold voltage is reached at both ends of the diode component, and at this time the diode component is conducted, and the faulty signal circuit is bypassed. Since the response time of the diode component is very fast, the entire switching process is disturbance-free.

[0048] In the present utility model, by providing a diode component between the input end and the output end of the terminal and using the threshold voltage principle of the diode, when the signal distribution circuit externally connected to the terminal is open-circuited, the input end and the output end of the terminal can be conducted through the diode, so as not to affect the transmission of downstream signals, and seamless switching of the standby circuit can be realized, achieving that when the externally connected circuit of the terminal fails or is repaired, it does not affect other redundant signal distribution circuits.

[0049] In a feasible embodiment, all diode components are connected in parallel with all signal sub-multiplication circuits.

[0050] Specifically, all diode components are connected in parallel with all signal sub-multiplication circuits, which can ensure the information transmission of the redundant signal distribution circuit in terms of terminals. When all diode components are connected in parallel with all signal sub-multiplication circuits, if a signal sub-multiplication circuit has a problem, the other signal distribution sub-multiplication circuits in the corresponding signal distribution circuit are open-circuited, and the corresponding signal distribution circuit transmits the information to the next signal distribution circuit through the diode components. This can improve the anti-interference ability and self-healing property of the system, enhance the stability and reliability, reduce the maintenance cost and downtime at the same time, and ensure the efficient and long-term operation of the system.

[0051] In an optional embodiment, as Figure 3 shown, the diode component includes at least two diode elements. The diode elements are connected end to end in series. The positive electrode of the first diode element of the diode component is connected to the first input terminal. The negative electrode of the last diode element of the diode component is connected to the first output terminal.

[0052] In a diode, when a positive voltage is connected to the positive electrode and a negative voltage is connected to the negative electrode, the diode is in the forward bias state and can conduct electricity well. On the contrary, when the voltage polarity is reversed, the diode enters the reverse bias state and blocks the current from passing through. After conduction, a voltage drop will occur between the positive and negative electrodes of the diode. For common silicon diodes, this voltage drop is about 0.6 to 0.7 volts. The conduction voltage capacity of a single diode is limited. By connecting the diodes in series, the voltage borne by each diode can be shared, thereby improving the voltage withstand capacity of the entire component. Specifically, the number of diode elements in the diode component is set according to needs.

[0053] In an optional embodiment, the conduction voltage of the diode component is less than the terminal voltage across the terminals.

[0054] Specifically, when the conduction voltage of the diode component is less than the terminal voltage, when an abnormality occurs in the signal sub-multiplication circuit connected to the terminal, the diode component can conduct the signal at the first input terminal to the first output terminal.

[0055] It should be noted that when the diode component is connected in parallel with all signal sub-multiplication circuits, the conduction voltage of the diode component is greater than the operating voltage when all signal sub-multiplication circuits are connected in series.

[0056] In an optional embodiment, the terminal is a two-in-two-out terminal, including a set of first input terminal and first output terminal, and a set of second input terminal and second output terminal; it is connected to one signal sub-multiplication circuit; the positive input terminal of the signal sub-multiplication circuit is connected to the second output terminal; the negative input terminal of the signal sub-multiplication circuit is connected to the second input terminal; the first input terminal is connected to the positive electrode of the diode component and the second input terminal; the first output terminal is connected to the negative electrode of the diode component and the second output terminal.

[0057] Further, the terminal includes a set of diode components. The diode components are connected in parallel with the signal sub-multiplication loop. In some other feasible embodiments, the diode components can also be connected to the second input terminal and the second output terminal, which has no impact on the output transmission.

[0058] In this embodiment, the two-in-two-out terminal can be accessed, enabling the signal separation device to have two signal sub-multiplication loops that do not affect each other, so they can be redundant with each other to ensure the normal operation of the function.

[0059] In an alternative embodiment, the conduction voltage of the diode components is higher than the operating voltage of the signal sub-multiplication loop.

[0060] Specifically, when the diode components are connected in parallel with a single signal sub-multiplication loop, the conduction voltage of the diode components should be greater than the operating voltage of the single signal sub-multiplication loop. When the conduction voltage of the diode components is higher than the operating voltage of the signal sub-multiplication loop, the diode components will not be conducted when the signal sub-multiplication loop is operating normally, and then the signal sub-multiplication loop operates normally. When the signal sub-multiplication loop is abnormal, the diode components will be conducted, allowing the signal to flow from the corresponding second input terminal and the second output terminal into the next second input terminal.

[0061] In an alternative embodiment, the signal sub-multiplication loop includes a signal multiplier; the signal multiplier is a one-to-two signal multiplier; the input terminal of the signal multiplier is connected to the second input terminal and the second output terminal. The output terminal of the signal multiplier is connected to an external device.

[0062] The one-to-two signal multiplier can evenly distribute the input signal to two output ports, ensuring that the signal levels of the two output ports are equal, thereby improving the efficiency and reliability of signal transmission. And the one-to-two signal multiplier has a low insertion loss, which can reduce the energy loss of the signal during transmission.

[0063] In an alternative embodiment, as Figure 4 shown, each group of second input terminals and second output terminals is connected to a diode component, and the diode component is connected in parallel with the corresponding signal sub-multiplication loop.

[0064] The second input terminal is conducted to the second output terminal through the diode component or the signal sub-multiplication loop, and the received signal is conducted from the second input terminal to the second output terminal.

[0065] Specifically, each group of second input terminals and second output terminals is connected to a diode component, so that each group of second input terminals and second output terminals do not affect each other. When the signal sub-multiplication loop is abnormal, it will not affect other signal sub-multiplication loops.

[0066] In an alternative embodiment, the diode assembly includes at least two diode elements; the diode elements are connected in series; the positive electrode of the first diode element of the diode assembly is connected to the corresponding second input terminal; the negative electrode of the last diode element of the diode assembly is connected to the corresponding second output terminal.

[0067] Specifically, when multiple diodes are connected in series, the conduction threshold can be multiplied. Each diode has a threshold voltage when conducting. For silicon diodes, it is about 0.7V, and for germanium diodes, it is about 0.3V. When two diodes are in series, the total conduction threshold voltage will double. For example, two silicon diodes in series need about 1.4V to conduct. By connecting multiple diodes in series, dynamic adjustment can be made according to the operating voltage of the signal sub-multiplication circuit, improving the flexibility of the signal sub-multiplication circuit.

[0068] Among a group of second input terminals and second output terminals, the external input signal is transmitted from the second input terminal to the second output terminal through the signal sub-multiplication circuit or the diode assembly.

[0069] Specifically, among a group of second input terminals and second output terminals, the external input signal is transmitted from the second input terminal to the second output terminal through the signal sub-multiplication circuit or the diode assembly. The signal sub-multiplication circuit evenly distributes the input signal, improving the transmission efficiency. The diode assembly utilizes the unidirectional conduction characteristic to reduce energy loss and ensure efficient transmission. This design enhances the isolation degree between output ports, reduces interference, and improves the system performance. At the same time, the passive stability of the diode and the protection circuit ability enhance the system reliability. This configuration is small in size, light in weight, and low in cost, suitable for various application scenarios. Reasonable selection and configuration of this design can improve the system performance and reliability, saving costs and space.

[0070] In an alternative embodiment, the number of signal sub-multiplication circuits in the signal distribution circuit is less than or equal to the total number of groups of second input terminals and second output terminals.

[0071] Furthermore, in some application scenarios, it may not be necessary to configure a signal sub-multiplication circuit for each input-output terminal. Limiting its number can be flexibly configured according to actual needs, thereby optimizing resource utilization. In some cases, too many signal sub-multiplication circuits may cause signal attenuation or distortion. By limiting its number, the quality of signal transmission can be ensured, improving the overall performance of the system.

[0072] In a feasible embodiment, such as Figure 5As shown in the figure, 101 is the first input terminal, 102 is the first output terminal, 103 is the second input terminal, 104 is the second output terminal, IN is the input, and OUT is the output. Specifically, the signal distribution device has two signal distribution loops. Each signal distribution loop includes a terminal and a signal sub-multiplication loop. The terminal includes a first input interface, a first output interface, a second input interface, and a second output interface. The signal sub-multiplication loop includes a one-to-two signal multiplier. Among them, the one-to-two signal multiplier includes a positive input terminal and a negative input terminal. The positive input terminal is connected to the second input interface, and the negative input is connected to the second output interface.

[0073] Taking the turbine valve position feedback signal of the CPR1000 domestic turbine control system as an example, the 4-20mA valve position feedback signal sent to the turbine control cabinet on site needs to be sent to valve servo cards A and B, and analog input cards A and B respectively, a total of four paths. A and B are redundant with each other to realize the overall redundancy function of the control system. Specifically, a two-in-two-out terminal is used, and the diode components in the terminal include two series-connected diodes. Silicon diodes are selected for the diodes, and the conduction voltage is 0.7V. The two diodes are connected in series to make the conduction voltage reach 1.4V. Removing the signal multiplier will not affect the connection between the diode and the input current. The selected input internal resistance of the one-to-two signal multiplier is 50Ω, which supports an input current of 4-20mA and can connect two paths of 4-20mA output current.

[0074] Since the input current is in the range of 4-20mA, the voltage on both sides of the input terminal will not exceed 1V, which does not reach the conduction voltage of the diode of 1.4V. Therefore, the diode is in the cut-off state and will not shunt. At this time, input a 4-20mA current, and output 4 identical 4-20mA currents. When a fault open circuit occurs in the input of the signal multiplier, or when it needs to be removed online due to maintenance, the circuit between inputs 1 and 2 of the signal multiplier is open. At this time, the voltage of the signal input loop (24V supply voltage) will directly exceed 1.4V. When the voltage across the diode in parallel with 1 and 2 exceeds 1.4V, it will directly conduct, and the input DC signal of the other signal multiplier will be transmitted through the conducting diode, so it will not be affected. Using the principle of automatic conduction of the diode, the automatic cut-off function of the faulty component is realized at a relatively low cost.

[0075] The above embodiments only represent the preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A signal distribution device, characterized in that: comprising at least two signal distribution loops, each signal distribution loop comprising a terminal and at least one signal sub-multiplication loop, the terminal comprising a set of first input terminals and first output terminals, and at least one set of second input terminals and second output terminals; Each signal multiplication sub-circuit is connected between a group of the second input terminals and the second output terminals, and each of the signal multiplication sub-circuit and the corresponding second input terminals and the second output terminals respectively form a plurality of signal multiplication circuits; All signal multiplication loops are connected in series between the first input terminal and the second output terminal through the corresponding second input terminal and the second output terminal; All signal distribution loops are connected in series in sequence through the first input end and the first output end of the corresponding terminal, and the external input signal is transmitted in sequence between the various signal distribution loops through the terminal; In a signal distribution loop, an external input signal is transmitted in sequence between the signal sub-multiplication loops, and each of the signal sub-multiplication loops multiplies the external input signal to obtain a multi-channel signal; The terminal includes at least one diode component; the diode component is connected in series with the first input terminal and the first output terminal; the first input terminal is connected to the first output terminal through the diode component or the at least one group of the second input terminal and the second output terminal, so as to conduct the received signal from the first input terminal to the first output terminal.

2. The signal distribution device according to claim 1, characterized in that: All of the diode assemblies are connected in parallel with all of the signal sub-multiplication loops.

3. The signal distribution device according to claim 2, characterized in that: The diode assembly includes at least two diode elements; the diode elements are connected end to end in series; the anode of the first diode element of the diode assembly is connected to the first input end; and the cathode of the last diode element of the diode assembly is connected to the first output end.

4. The signal distribution device according to claim 3, characterized in that: The conduction voltage of the diode component is less than the circuit end voltage of the terminal.

5. The signal distribution device according to claim 4, characterized in that: The terminal is a two-input and two-output terminal, including a group of the first input terminal and the first output terminal, and a group of the second input terminal and the second output terminal; it is connected to one of the signal sub-multiplication circuits; the positive input terminal of the signal sub-multiplication circuit is connected to the second output terminal; the negative input terminal of the signal sub-multiplication circuit is connected to the second input terminal; the first input terminal is connected to the positive electrode of the diode component and the second input terminal; the first output terminal is connected to the negative electrode of the diode component and the second output terminal.

6. The signal distribution device according to claim 5, characterized in that: The conduction voltage of the diode component is higher than the operating voltage of the signal sub-multiplication circuit.

7. The signal distribution device according to claim 6, characterized in that: The signal sub-multiplication circuit includes a signal multiplier; the signal multiplier is a one-to-two signal multiplier; the input end of the signal multiplier is connected to the second input end and the second output end; the output end of the signal multiplier is connected to an external device.

8. The signal distribution device according to claim 1, characterized in that: Each group of the second input end and the second output end is connected to a diode component, and the diode component is connected in parallel with the corresponding signal sub-multiplication circuit; The second input end is connected to the second output end through the diode component or the signal sub-multiplication circuit, so that the received signal is conducted from the second input end to the second output end.

9. The signal distribution device according to claim 8, characterized in that: The diode assembly comprises at least two diode elements; the diode elements are connected in series; the anode of the first diode element of the diode assembly is connected to the corresponding second input terminal; the cathode of the last diode element of the diode assembly is connected to the corresponding second output terminal; In a set of a second input terminal and a second output terminal, an external input signal is transmitted from the second input terminal to the second output terminal through the signal sub-multiplication circuit or the diode component.

10. The signal distribution device according to claim 8, characterized in that: The number of the signal sub-multiplication circuits in the signal distribution circuit is less than or equal to the total number of the second input terminal and the second output terminal.

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