Voltage acquisition equipment for wet contact

Abstract

The invention discloses voltage acquisition equipment for a wet contact. The voltage acquisition equipment comprises an external interface module, a signal acquisition module, a signal calculation module, an internal interface module and an electronic switch module. The external interface module is used for connecting an external signal to be detected; the signal acquisition module comprises a first acquisition branch connected to the external interface module; the signal calculation module comprises a first calculation branch; the internal interface module is electrically connected to the signal calculation module; the two ends of the electronic switch module are connected to the external interface module and the signal acquisition module, the electronic switch module comprises a control unit which is used for controlling connection and disconnection between the external interface module and the signal acquisition module, and the control unit outputs a dynamic waveform with a first duty ratio. According to the voltage acquisition equipment for the wet contact, a plurality of branches which are connected in parallel are arranged in the signal acquisition module for sampling respectively, so that wide-range safe acquisition of the voltage of the wet contact is realized, an error acquisition phenomenon is avoided, and accurate judgment of high and low level states is ensured.

Description

Technical Field

[0001] The present invention relates to a voltage monitoring device, in particular to a voltage acquisition device for a wet contact. Background Art

[0002] In industrial automation control systems and rail transit signal monitoring systems, the precise acquisition and real-time monitoring of voltage parameters are the core links to ensure the safe operation of equipment and fault warning. The voltage acquisition devices in the existing technology generally have the following defects: the traditional acquisition module has a fixed range, and its effective measurement range is usually limited to a certain range around the rated voltage, which is difficult to adapt to the common network voltage fluctuations in rail transit power supply systems or the wide range of dynamic voltage changes generated by industrial frequency conversion equipment. More importantly, when the measured voltage exceeds the preset range, the existing technology lacks an effective adaptive adjustment mechanism, resulting in signal saturation and distortion, which significantly increases the complexity of system fault diagnosis and complicates fault location. The above technical bottlenecks not only restrict the overall performance indicators of the monitoring system, but also trigger the risk of chain signal misjudgment, posing a potential threat to the safe operation of critical infrastructure.

[0003] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0004] The object of the present invention is to provide a voltage acquisition device for wet contacts, which has the advantage of a wide voltage adaptability range.

[0005] To achieve the above object, the present invention provides a voltage acquisition device for wet contacts, comprising:

[0006] External interface module, used for connecting external signals to be detected;

[0007] A signal acquisition module, comprising a first acquisition branch connected to the external interface module, wherein the first acquisition branch comprises a first voltage-stabilizing diode and a first optical coupling unit, wherein an output end of the first voltage-stabilizing diode is electrically connected to an input end of the first optical coupling unit;

[0008] a signal calculation module, comprising a first calculation branch connected to the output end of the first optical coupling unit; the first calculation branch comprises a first calculation unit and a first processing unit, and the first processing unit is electrically connected to the first calculation unit;

[0009] An internal interface module, electrically connected to the signal calculation module;

[0010] An electronic switch module, wherein the input end of the electronic switch module is connected to the external interface module, and the output end of the electronic switch module is connected to the signal acquisition module. The electronic switch module includes a control unit, which is used to control the on-off between the external interface module and the signal acquisition module, and the control unit outputs a dynamic waveform with a first duty cycle.

[0011] Optionally, the signal acquisition module also includes a second acquisition branch, the second acquisition branch includes a second voltage regulator diode and a second optocoupler unit, and the output end of the second voltage regulator diode is electrically connected to the input end of the second optocoupler unit; the signal calculation module also includes a second calculation branch connected to the output end of the second optocoupler unit; the second calculation branch includes a second calculation unit and a second processing unit, and the second processing unit is electrically connected to the second calculation unit.

[0012] Optionally, the voltage acquisition device also includes an internal communication module, which includes a first internal bus unit and a second internal bus unit, the first internal bus unit is respectively connected to the first processing unit and the internal interface module; the second internal bus unit is respectively connected to the second processing unit and the internal interface module.

[0013] Optionally, the first zener diode and the second zener diode have different breakdown thresholds.

[0014] Optionally, the voltage acquisition device further includes a safety switch module, which includes a first safety input terminal and a safety output terminal, wherein the first safety input terminal is electrically connected to the external interface module, and the safety output terminal is electrically connected to the input terminal of the electronic switch module.

[0015] Optionally, the voltage acquisition device further includes a signal generating module, the signal generating module is used to simulate an external signal, and an output end of the signal generating module is electrically connected to the signal acquisition module.

[0016] Optionally, the safety switch module further includes a second safety input terminal and a signal selection unit, the second safety input terminal is electrically connected to the signal generating module, and the input side of the signal selection unit is connected to the first safety input terminal and the second safety input terminal, for selecting the signal of the first safety input terminal or the second safety input terminal to be transmitted to the safety output terminal.

[0017] Optionally, the safety switch module has a wireless transmission function, and the safety switch module is wirelessly connected to a host computer to receive a switch command from the host computer and transmit the operating status of the safety switch module to the host computer.

[0018] Optionally, the input end of the electronic switch module is connected to the safety output end of the safety switch module.

[0019] Optionally, the voltage acquisition device further includes an auxiliary monitoring module, which is arranged between the external interface module and the safety switch module, and is used to monitor the clutter component of the signal to be detected.

[0020] Optionally, the control unit is further configured to control charging and discharging time to eliminate induced charges.

[0021] Optionally, the voltage acquisition device further includes a wireless transmission module, which is electrically connected to the signal calculation module and is used to detect the state of the signal calculation module and transmit the state to a host computer.

[0022] Optionally, the voltage acquisition device further includes a power management module, which is connected to the signal calculation module and is used to monitor the temperature and operating voltage of the signal calculation module.

[0023] In summary, compared with the prior art, the voltage acquisition device for wet contacts provided by the present invention has the following beneficial effects:

[0024] The voltage acquisition device for wet contacts of the present invention realizes safe acquisition of the wet contact voltage over a wide range by setting multiple parallel branches in the signal acquisition module for sampling respectively, avoids erroneous acquisition, and ensures accurate judgment of high and low level states. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic diagram of the overall structure of the voltage acquisition device for wet contacts of the present invention.

[0026] Figure 2 This is a dynamic control timing diagram of the voltage acquisition device of the present invention.

[0027] Description of reference numerals:

[0028] Voltage acquisition equipment 1

[0029] External interface module 10

[0030] Signal acquisition module 20

[0031] First collection branch 210

[0032] First Zener diode 211

[0033] First optical coupling unit 212

[0034] Second collection branch 220

[0035] The second voltage stabilizing diode 221

[0036] Second optical coupling unit 222

[0037] Signal calculation module 30

[0038] First calculation branch 310

[0039] First calculation unit 311

[0040] First processing unit 312

[0041] Second calculation branch 320

[0042] Second calculation unit 321

[0043] Second processing unit 322

[0044] Internal interface module 40

[0045] Internal communication module 50

[0046] First internal bus unit 510

[0047] Second internal bus unit 520

[0048] Safety switch module 60

[0049] First safety input 610

[0050] Second safety input terminal 620

[0051] Safety output 630

[0052] Signal selection unit 640

[0053] Signal generating module 70

[0054] Electronic switch module 80

[0055] Wireless transmission module 90

[0056] Power Management Module 1000

[0057] Auxiliary monitoring module 1100 DETAILED DESCRIPTION

[0058] The following is a further detailed description of the voltage acquisition device for wet contacts proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the drawings are in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention, so they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0059] like Figure 1 As shown, the present invention provides a voltage acquisition device 1 for wet contacts, comprising an external interface module 10 , a signal acquisition module 20 , a signal calculation module 30 , an internal interface module 40 and an electronic switch module 80 .

[0060] The external interface module 10 is used to connect the external signal to be detected, and the voltage acquisition device 1 obtains the external signal to be detected through the external interface module 10. The signal acquisition module 20 includes a first acquisition branch 210 connected to the external interface module 10. The first acquisition branch 210 includes a first voltage regulator diode 211 and a first optical coupling unit 212. The output end of the first voltage regulator diode 211 is electrically connected to the input end of the first optical coupling unit 212. The signal to be detected passes through the first voltage regulator diode 211 and then inputs the first optical coupling unit 212. The first optical coupling unit 212 realizes the safety isolation between the external signal to be detected and the subsequent signal calculation module 30. The first voltage regulator diode 211 is set at the input end of the first optical coupling unit 212 to prevent the input voltage from being too high, which may cause damage to the optical coupler in the first optical coupling unit 212, thereby protecting the first optical coupling unit 212.

[0061] The signal calculation module 30 includes a first calculation branch 310 connected to the output end of the first optical coupling unit 212. The first calculation branch 310 includes a first calculation unit 311 and a first processing unit 312, and the first processing unit 312 is electrically connected to the first calculation unit 311. In this embodiment, the first calculation unit 311 includes an FPGA (Field-Programmable Gate Array), which is connected to the output end of the first optical coupling unit 212. The output signal of the first optical coupling unit 212 enters the FPGA after processing, and data calculation is performed in the FPGA to obtain the collection result of the external voltage to be collected. The first processing unit 312 includes a CPU (Central Processing Unit), which is connected to the first calculation unit 311 to achieve functional hierarchical optimization and reasonable resource allocation. The FPGA performs fast data calculation and the CPU performs subsequent algorithm data processing.

[0062] The internal interface module 40 is electrically connected to the signal calculation module 30 . The signal calculation module 30 calculates and obtains data, which is then transmitted to other subsequent data interfaces by the internal interface module 40 .

[0063] The input end of the electronic switch module 80 is indirectly connected to the external interface module 10. The output end of the electronic switch module 80 is connected to the signal acquisition module 20. The electronic switch module 80 includes a control unit for controlling the connection between the external interface module 10 and the signal acquisition module 20. The control unit outputs a dynamic waveform with a first duty cycle. When the dynamic waveform output by the control unit is at a low level, the signal acquisition module 20 is connected to the external interface module 10 to collect the voltage in the external interface module 10. When the dynamic waveform signal output by the control unit is at a high level, the signal acquisition module 20 is disconnected from the external interface module 10, and the signal acquisition module 20 cannot collect the external signal to be detected through the external interface module 10, thereby reducing power consumption. In addition, when the voltage amplitude of the external interface module 10 is high, the dynamic waveform of the control unit controls the connection between the signal acquisition module 20 and the external interface module 10 to avoid excessive internal heating and internal board temperature in the signal acquisition module 20 caused by continuous collection of large-amplitude voltages, which would result in an inability to collect wide-range input voltage signals. The dynamic waveform of the control unit controls the on-off between the signal acquisition module 20 and the external interface module 10, thereby reducing the heat generated per unit time and the power consumption of the signal acquisition module 20, while enabling the voltage acquisition device 1 of the present application to be suitable for voltage acquisition with higher amplitude and wider range.

[0064] Further Figure 2As shown, an electronic switch module 80 with a dynamic waveform output is provided. The dynamic waveform of the control unit within the electronic switch module 80 controls the connection and disconnection between the signal acquisition module 20 and the external interface module 10. During the dynamic waveform period T3, when the dynamic waveform output by the control unit is at a low level, the signal acquisition module 20 and the external interface module 10 are connected for acquisition. When the dynamic waveform output by the control unit is at a high level, the signal acquisition module 20 and the external interface module 10 are disconnected and acquisition is not performed. If a voltage amplitude signal is acquired during multiple consecutive low-level periods, the acquisition result is valid. If the signal input to the external interface module 10 contains AC interference, since no stable signal can be acquired during the consecutive low-level periods, it is determined that the external signal is interfering, and acquisition is stopped. Therefore, the provision of the electronic switch module 80 with a dynamic waveform output also has the effect of resisting external interference AC signal input.

[0065] Continue as Figure 1 As shown, the signal acquisition module 20 also includes a second acquisition branch 220. The second acquisition branch 220 is arranged in parallel with the first acquisition branch 210 and is also connected to the external interface module 10 to measure the input voltage of the external interface module 10. The second acquisition branch 220 and the first acquisition branch 210 form a 2-out-of-2 architecture. During output, the results of the first acquisition branch 210 and the second acquisition branch 220 are compared. If the voltage measurement results of the two branches are the same, the measurement result is considered correct. If the voltage measurement results of the two branches are different, the measurement result is determined to be incorrect and the acquisition and measurement are repeated.

[0066] The second acquisition branch 220 includes a second voltage-stabilizing diode 221 and a second optocoupler unit 222. The output end of the second voltage-stabilizing diode 221 is electrically connected to the input end of the second optocoupler unit 222. The signal to be detected passes through the second voltage-stabilizing diode 221 and is then input into the second optocoupler unit 222. The second optocoupler achieves safe isolation between the external signal to be detected and the subsequent signal calculation module 30. The second voltage-stabilizing diode 221 is provided at the input end of the second optocoupler unit 222 to prevent damage to the optocoupler in the second optocoupler unit 222 due to excessive input voltage, thereby protecting the second optocoupler unit 222.

[0067] The signal calculation module 30 also includes a second calculation branch 320 connected to the output end of the second optical coupling unit 222. The second calculation branch 320 includes a second calculation unit 321 and a second processing unit 322, and the second processing unit 322 is electrically connected to the second calculation unit 321. In this embodiment, the second calculation unit 321 includes an FPGA (Field-Programmable Gate Array), which is connected to the output end of the second optical coupling unit 222. The output signal of the second optical coupling unit 222 enters the FPGA after processing, and data calculation is performed in the FPGA to obtain the collection result of the external voltage to be collected. The second processing unit 322 includes a CPU (Central Processing Unit), which is connected to the second calculation unit 321 to achieve functional hierarchical optimization and reasonable resource allocation. The FPGA performs fast data calculation and the CPU performs subsequent algorithm data processing.

[0068] In this embodiment, the first Zener diode 211 and the second Zener diode 221 have different breakdown thresholds, thereby realizing a differentiated design of the first acquisition branch 210 and the second acquisition branch 220. The same voltage is measured using Zener diodes with different breakdown thresholds, and the measurement results of the two acquisition branches are compared to realize a 2-out-of-2 acquisition design, thereby improving the accuracy of the measurement results.

[0069] The voltage acquisition device 1 also includes an internal communication module 50. The internal communication module 50 includes a first internal bus unit 510 and a second internal bus unit 520. The first internal bus unit 510 is connected to the first processing unit 312 and the internal interface module 40, respectively. The second internal bus unit 520 is connected to the second processing unit 322 and the internal interface module 40, respectively. In this embodiment, the first and second internal bus units 510, 520 are connected to the first and second calculation branches 310, 320, and the internal interface module 40, ensuring that the first and second internal bus units 510, 520 do not interfere with each other.

[0070] Continue as Figure 1 As shown, the voltage acquisition device 1 also includes a safety switch module 60. The safety switch module 60 includes a first safety input terminal 610 and a safety output terminal 630. The first safety input terminal 610 is electrically connected to the external interface module 10, and the safety output terminal 630 is electrically connected to the input terminal of the electronic switch module 80. The safety switch module 60 is used to disconnect the electronic switch module 80 from the external interface module 10, preventing external interference signals or clutter signals from directly entering the signal acquisition module 20 through the external interface module 10 and causing damage, thereby protecting the internal circuits of the voltage acquisition device 1.

[0071] In this embodiment, voltage acquisition device 1 further includes a signal generating module 70, which is configured to simulate an external signal and thereby implement self-testing of first acquisition branch 210, second acquisition branch 220, first calculation branch 310, and second calculation branch 320. The output of signal generating module 70 is electrically connected to signal acquisition module 20.

[0072] In this embodiment, the safety switch module 60 further includes a second safety input terminal 620 and a signal selection unit 640. The safety switch module 60 adopts a multi-contact design. The second safety input terminal 620 is electrically connected to the signal generating module 70. The input side of the signal selecting unit 640 is connected to the first safety input terminal 610 and the second safety input terminal 620, and is used to select the signal input from the first safety input terminal 610 or the second safety input terminal 620 for transmission to the safety output terminal 630. The signal generating module 70 is used to simulate external signals and implement BIT (Built-In Test) detection of the signal acquisition module 20 and the signal calculation module 30. By providing the signal generating module 70 and the corresponding circuit, the voltage acquisition device 1 has a self-test capability, and the functional detection of the signal acquisition module 20 and the signal calculation module 30 can be implemented without relying on other external test equipment.

[0073] When a self-test is required, the signal selection unit 640 connects the signal input of the second safety input terminal 620 to the safety output terminal 630 and disconnects the first safety input terminal 610 from the safety output terminal 630. During the self-test, the signal generation module 70 generates a simulated external signal according to the settings. The simulated external signal is input into the signal acquisition module 20 and the signal calculation module 30 via the signal selection unit 640. After calculation, the collected signal information is obtained and compared with the original signal generated by the signal generation module 70. If the generated signal and the collected and calculated signal amplitude can be verified, it indicates that the signal acquisition module 20 and the signal calculation module 30 are functioning properly; otherwise, it is considered that the signal acquisition module 20 and the signal calculation module 30 are not functioning properly.

[0074] In this embodiment, the safety switch module 60 has a wireless transmission function and is wirelessly connected to a host computer (not shown) to receive switch commands from the host computer and transmit the operating status of the safety switch module 60 to the host computer. The safety switch module 60 not only switches signals but also transmits the status of the signal selection unit 640 back to the host computer. The host computer controls the signal selection unit 640 through the wireless transmission function of the safety switch module 60. The input terminal of the electronic switch module 80 is connected to the safety output terminal 630 of the safety switch module 60.

[0075] The voltage acquisition device 1 also includes an auxiliary monitoring module 1100, located between the external interface module 10 and the safety switch module 60. This module is used to monitor the noise content of the signal to be detected. This module includes an analog-to-digital converter (ADC) that converts the input analog signal into a digital signal. If the auxiliary monitoring module 1100 detects excessive noise content in the signal input from the external interface module 10, it proactively disconnects the external interface module 10 and the safety switch module 60, preventing the external signal with excessive noise from entering subsequent circuits.

[0076] In this embodiment, the control unit is also used to control the charging and discharging time to eliminate induced charges. When the signal transmission distance is long, induced charges will be generated on the wire, which will affect the subsequent signal collection. Figure 2 As shown, during the T3 period of signal acquisition, the impact of induced charge mis-acquisition cannot be eliminated. The control unit of this embodiment calculates the charge and discharge time (T2) based on the acquisition load and the cable parasitic capacitance. During T2, the control unit lowers the voltage level to charge and discharge the resistors and capacitors, consuming the cable's induced charge and preventing the induced charge from affecting subsequent signal acquisition. T2 and T3 together constitute the entire acquisition cycle, T1.

[0077] In this embodiment, the voltage acquisition device 1 further includes a wireless transmission module 90, which is electrically connected to the signal calculation module 30. The wireless transmission module 90 is used to detect the status of the signal calculation module 30 and transmit it to the host computer. The wireless transmission module 90 enables real-time transmission of the monitoring status of the voltage acquisition device 1.

[0078] In this embodiment, the voltage acquisition device 1 also includes a power management module 1000, which is connected to the signal calculation module 30. The power management module 1000 is used to monitor the temperature and operating voltage of the signal calculation module 30 to ensure that the voltage and temperature of the signal calculation module 30 operate within an appropriate range.

[0079] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0080] In the description of the present invention, it should be understood that the terms "center," "height," "thickness," "up," "down," "vertical," "horizontal," "top," "bottom," "inside," "outside," "axial," "radial," "circumferential," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0081] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0082] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0083] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A voltage acquisition device for wet contacts, characterized in that: The voltage acquisition device includes: an external interface module for connecting an external signal to be detected; A signal acquisition module, comprising a first acquisition branch connected to the external interface module, wherein the first acquisition branch comprises a first voltage-stabilizing diode and a first optical coupling unit, wherein an output end of the first voltage-stabilizing diode is electrically connected to an input end of the first optical coupling unit; a signal calculation module, comprising a first calculation branch connected to the output end of the first optical coupling unit; the first calculation branch comprises a first calculation unit and a first processing unit, and the first processing unit is electrically connected to the first calculation unit; An internal interface module, electrically connected to the signal calculation module; An electronic switch module, wherein the input end of the electronic switch module is connected to the external interface module, and the output end of the electronic switch module is connected to the signal acquisition module. The electronic switch module includes a control unit, which is used to control the on-off between the external interface module and the signal acquisition module, and the control unit outputs a dynamic waveform with a first duty cycle.

2. The voltage acquisition device according to claim 1, characterized in that: The signal acquisition module also includes a second acquisition branch, which includes a second voltage regulator diode and a second optocoupler unit, and the output end of the second voltage regulator diode is electrically connected to the input end of the second optocoupler unit; the signal calculation module also includes a second calculation branch connected to the output end of the second optocoupler unit; the second calculation branch includes a second calculation unit and a second processing unit, and the second processing unit is electrically connected to the second calculation unit.

3. The voltage acquisition device according to claim 2, characterized in that: The voltage acquisition device also includes an internal communication module, which includes a first internal bus unit and a second internal bus unit. The first internal bus unit is respectively connected to the first processing unit and the internal interface module; the second internal bus unit is respectively connected to the second processing unit and the internal interface module.

4. The voltage acquisition device according to claim 2, characterized in that: The first Zener diode and the second Zener diode have different breakdown thresholds.

5. The voltage acquisition device according to claim 1, wherein: The voltage acquisition device further includes a safety switch module, which includes a first safety input terminal and a safety output terminal. The first safety input terminal is electrically connected to the external interface module, and the safety output terminal is electrically connected to the input terminal of the electronic switch module.

6. The voltage acquisition device according to claim 5, characterized in that: The voltage acquisition device further includes a signal generating module, which is used to simulate an external signal. The output end of the signal generating module is electrically connected to the signal acquisition module.

7. The voltage acquisition device according to claim 6, characterized in that: The safety switch module also includes a second safety input terminal and a signal selection unit. The second safety input terminal is electrically connected to the signal generating module. The input side of the signal selection unit is connected to the first safety input terminal and the second safety input terminal, and is used to select the signal of the first safety input terminal or the second safety input terminal to be transmitted to the safety output terminal.

8. The voltage acquisition device according to claim 5, characterized in that: The safety switch module has a wireless transmission function and is wirelessly connected to a host computer to receive a switch command from the host computer and transmit the operating status of the safety switch module to the host computer.

9. The voltage acquisition device according to claim 5, characterized in that: The input end of the electronic switch module is connected to the safety output end of the safety switch module.

10. The voltage acquisition device according to claim 5, characterized in that: The voltage acquisition device further includes an auxiliary monitoring module, which is arranged between the external interface module and the safety switch module, and is used to monitor the clutter components of the signal to be detected.

11. The voltage acquisition device according to claim 1, wherein: The control unit is further used to control the charging and discharging time to eliminate the induced charge.

12. The voltage acquisition device according to claim 1, wherein: The voltage acquisition device further includes a wireless transmission module, which is electrically connected to the signal calculation module and is used to detect the state of the signal calculation module and transmit the state to a host computer.

13. The voltage acquisition device according to claim 1, wherein: The voltage acquisition device further includes a power management module, which is connected to the signal calculation module and is used to monitor the temperature and operating voltage of the signal calculation module.

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