A liquid resistance voltage dividing type high voltage pulse measuring system without electromagnetic interference

Abstract

This application relates to the field of high-voltage pulse measurement, and in particular to a liquid resistance voltage divider type high-voltage pulse measurement system free from electromagnetic interference. It includes a cavity assembly and an oscilloscope. Electrode assemblies are disposed inside the cavity assembly, with a water-based conductive medium filling the spaces between the electrode assemblies. Each electrode assembly includes an input electrode plate and an output electrode plate arranged opposite each other, forming a conductive channel. A voltage signal acquisition module is electrically connected to the outside of the output electrode plate. The voltage signal acquisition module is electrically connected to the oscilloscope. The conductivity of the water-based conductive medium is within a preset range. The effective contact area between the electrode assembly and the water-based conductive medium is adjustable to determine the equivalent resistance of the conductive channel and maintain it within a preset range. The system also features a shielded shell and an insulating shielding structure. This application achieves high-precision, low-cost, and interference-free high-voltage pulse power supply measurement, realizing such measurement.

Description

Technical Field

[0001] This invention relates to the field of high-voltage pulse measurement technology, specifically to a liquid resistance voltage divider high-voltage pulse measurement system without electromagnetic interference. Background Technology

[0002] High-voltage pulse power supplies have wide applications in pulse power technology, plasma physics, environmental engineering, and medical equipment. Accurate measurement of their output voltage is crucial for ensuring stable equipment operation and optimizing pulse parameters. Traditional high-voltage pulse voltage measurement methods mainly include: Voltage divider measurement method: This method uses solid resistor voltage dividers, capacitive voltage dividers, etc. However, solid resistors are prone to thermal breakdown and waveform distortion under high-voltage pulses, and are susceptible to electromagnetic interference and impedance matching difficulties. Capacitive voltage dividers are easily affected by distributed capacitance, and measurement accuracy is greatly affected by environmental interference. Water resistor voltage divider method: Existing technologies mostly use copper sulfate solution, salt water, etc. as liquid resistors. These methods suffer from problems such as easy crystallization of the solution, unstable conductivity, and high maintenance costs. Moreover, most devices do not have specific shielding designs for electromagnetic interference. The strong electromagnetic radiation generated by high-voltage pulses will seriously interfere with the acquired signal, resulting in waveform distortion and large data errors. Rogowski coil / photoelectric measurement method: This method is complex in structure, expensive, and has high requirements for the installation environment, making it difficult to adapt to the needs of miniaturized and low-cost field measurements.

[0003] In addition, most existing water resistance voltage dividers use metal shielded cavities, which not only increases the manufacturing cost and size of the device, but also causes electric field distortion between the metal cavity and the liquid resistor, affecting measurement accuracy. At the same time, most devices do not clearly define key engineering parameters such as cavity size, conductivity range, and matching resistance value, making it impossible to achieve standardized and large-scale application and difficult to meet the precise measurement requirements of high-voltage pulse power supplies.

[0004] To address the aforementioned problems, this invention proposes a liquid resistance voltage divider high-voltage pulse measurement system without electromagnetic interference, solving the technical pain points of traditional devices such as large electromagnetic interference, complex structure, high cost, and difficult maintenance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an electromagnetic interference-free liquid resistance voltage divider high-voltage pulse measurement system. This system solves the problems of high electromagnetic interference, complex structure, high cost, and difficult maintenance of existing high-voltage pulse measurement devices, and achieves high-precision, low-cost, and interference-free measurement of the output voltage of high-voltage pulse power supplies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a liquid resistance voltage divider type high-voltage pulse measurement system without electromagnetic interference, including a cavity assembly and an oscilloscope. An electrode assembly is disposed inside the cavity assembly, the electrode assembly including an input electrode plate and an output electrode plate disposed opposite to each other. A conductive channel is formed between the input electrode plate, the output electrode plate, and the inner wall of the cavity assembly. The conductive channel is filled with a liquid resistive medium. A voltage signal acquisition module is electrically connected to the output electrode plate. The voltage signal acquisition module is electrically connected to the oscilloscope. The liquid resistive medium is a water-based conductive medium. The conductivity of the water-based conductive medium is within a preset range. The effective contact area between the electrode assembly and the water-based conductive medium is configured to be adjustable, so that the equivalent resistance of the conductive channel is determined by the combined effect of the conductivity and the effective conductive cross-sectional area, and remains within the preset range.

[0007] Preferably, the voltage signal acquisition module includes a shielded housing, a signal acquisition unit, and a BNC output interface for connecting the output electrode plate. The shielded housing is an integrated metal shield that is grounded.

[0008] Preferably, the conductive channel has an open-top structure.

[0009] Preferably, the system further includes an insulating shielding structure slidably disposed on the sidewalls of the input electrode plate and the output electrode plate facing the conductive channel.

[0010] Preferably, the input electrode plate and the output electrode plate are arranged in parallel, and the distance between the input electrode plate and the output electrode plate is a fixed distance.

[0011] Preferably, an input interface is provided on the side wall of the input electrode plate facing away from the conductive channel.

[0012] Preferably, the conductivity of the water-based conductive medium is between 1.3 mS / cm and 2.3 mS / cm.

[0013] Preferably, the preset resistance value of the conductive channel is 90Ω.

[0014] Preferably, a water outlet is provided at the bottom of the cavity assembly.

[0015] Preferably, the cavity assembly is a rectangular cavity made of transparent insulating material.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. Excellent anti-electromagnetic interference performance: The voltage signal acquisition module integrates a metal shielding structure and is grounded, which can effectively block the electromagnetic radiation generated by high voltage pulses from interfering with the acquired signal. This solves the problems of waveform distortion and large data errors in traditional devices, and significantly improves measurement accuracy.

[0017] 2. Simple structure and low cost: Using tap water as the liquid resistor, it does not require expensive copper sulfate solution or other special reagents. The use of an insulating cavity to replace the traditional metal shielding cavity greatly reduces manufacturing costs and maintenance difficulty, making it suitable for large-scale applications.

[0018] 3. Precise and stable impedance matching: By limiting the cavity size and conductivity range, a precise 90Ω matching resistor can be achieved. Conductivity fluctuations can be compensated by adjusting the effective contact area of ​​the electrode plate to ensure stable resistance value and adapt to the impedance requirements of various high-voltage pulse power supplies.

[0019] 4. Visual and easy to maintain: The transparent insulating cavity allows for real-time observation of the liquid status. The bottom outlet facilitates the replacement of tap water and adjustment of conductivity, making maintenance simple and convenient.

[0020] 5. Wide range of applications: The system voltage division ratio can be determined by matching the liquid resistance with the input impedance of the acquisition module, and it is suitable for high voltage pulse voltage measurement in the range of 1kV~100kV, adapting to the detection needs of various high voltage pulse power supplies. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 This is a schematic diagram of the external structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the external structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the circuit connection of the present invention.

[0023] In the diagram, 1. Cavity assembly; 2. Oscilloscope; 3. Electrode assembly; 4. Liquid resistive dielectric; 5. Input electrode plate; 6. Output electrode plate; 7. Conductive channel; 8. Voltage signal acquisition module; 9. Shielding shell; 10. Signal acquisition device; 11. BNC output interface; 12. Insulating shielding structure; 13. Water outlet; 14. Input interface. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of the present invention, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of the present invention without creative effort are also within the protection scope of the present invention.

[0025] This application mainly employs a combination of liquid resistance voltage divider and adjustable parameters to solve the problems of large electromagnetic interference, complex structure, high cost, and difficult maintenance in existing high-voltage pulse measurement devices. It achieves high-precision, low-cost, and interference-free high-voltage pulse measurement. The following is a further detailed description of this application. Example 1 The electromagnetic interference-free liquid resistance voltage divider high-voltage pulse measurement system provided in this application includes a cavity assembly 1 and an oscilloscope 2. Electrode assemblies 3 are disposed inside the cavity assembly 1, with liquid resistance dielectric 4 filling the spaces between the electrode assemblies 3. The electrode assemblies 3 are electrically connected to the oscilloscope 2 via a voltage signal acquisition module 8. This configuration avoids the problem of electromagnetic interference in traditional measurement methods, enabling accurate measurement of high-voltage pulses. The reasonable combination of the liquid resistance dielectric 4 and the electrode assemblies 3 reduces the impact of electromagnetic interference on the measurement results. Simultaneously, the voltage signal acquisition module 8 can stably transmit signals to the oscilloscope 2 for display and analysis.

[0026] Specifically, electrode assembly 3 includes an input electrode plate 5 and an output electrode plate 6 arranged opposite to each other, forming a conductive channel 7 between them. The input electrode plate 5 receives high-voltage pulse signals through the input interface 14, and the output electrode plate 6 outputs a voltage signal after voltage division. The input electrode plate 5 and output electrode plate 6 can be metal plates of different shapes, such as round or square, with common metal materials including copper and aluminum. In practical applications, electrode plates of different shapes and materials can be selected according to different measurement requirements and environments. For example, in situations where space is limited, square electrode plates can be selected to save space; while in situations where high conductivity is required, copper electrode plates can be selected.

[0027] The input electrode plate 5 and the output electrode plate 6 are arranged in parallel with a fixed spacing. This ensures a uniform electric field distribution within the conductive channel 7, resulting in a more stable voltage division effect. This parallel arrangement can be secured using mechanical structures, such as insulating supports, to fix the electrode plates inside the cavity assembly 1, ensuring the stability of their parallelism and spacing.

[0028] The conductive channel 7 has a top-opening structure, and the electrode assembly 3 is partially exposed to the water-based conductive medium. The system also includes an insulating shielding structure 12 disposed on the side surface of the electrode assembly 3, covering the portion of the electrode assembly 3 facing the water-based conductive medium. This allows the effective contact area between the electrode assembly 3 and the water-based conductive medium to be changed by adjusting the coverage area of ​​the insulating shielding structure 12. The insulating shielding structure 12 can be an insulating plastic sheet, rubber sheet, etc., and is fixed to the surface of the electrode assembly 3 by means of adhesive, snap-fit, etc. For example, when using an insulating plastic sheet, holes can be drilled in the plastic sheet, and it can be fixed to the electrode sheet with bolts.

[0029] A voltage signal acquisition module 8 is electrically connected to the outside of the output electrode plate 6. The voltage signal acquisition module 8 includes a shielded housing 9, a signal acquisition unit 10, and a BNC output interface 11. The shielded housing 9 is an integrated metal shield with grounding. The shielded housing 9 can effectively shield external electromagnetic interference and protect the signal acquisition unit 10 for normal operation. The signal acquisition unit 10 is used to acquire the voltage signal output from the output electrode plate 6, and process and amplify it. The BNC output interface 11 is used to transmit the processed signal to the oscilloscope 2. The shielded housing 9 can be made of stainless steel, aluminum alloy, or other metal materials, and is formed into an integrated structure through welding, riveting, or other methods, and grounded to enhance the shielding effect.

[0030] The voltage signal acquisition module 8 is electrically connected to the oscilloscope 2, which is used to display and analyze the acquired voltage signal. Through the oscilloscope 2, the operator can visually observe the waveform, amplitude, and other parameters of the high-voltage pulse. The liquid resistive medium 4 is a water-based conductive medium with a conductivity of 1.3 mS / cm to 2.3 mS / cm. The effective contact area between the electrode assembly 3 and the water-based conductive medium is configured to be adjustable, so that the equivalent resistance of the conductive channel 7 is determined by the combination of conductivity and effective conductive cross-sectional area, and maintained within a preset range of 90 Ω. By adjusting the conductivity of the water-based conductive medium and the effective contact area between the electrode assembly 3 and the water-based conductive medium, the equivalent resistance of the conductive channel 7 can be precisely controlled, thereby achieving accurate voltage division measurement of the high-voltage pulse. For example, the conductivity of the water-based conductive medium can be adjusted by adding electrolyte, and the effective contact area can be changed by adjusting the coverage area of ​​the insulating shielding structure 12.

[0031] The cavity assembly 1 is a rectangular cavity made of transparent insulating material, which allows for easy observation of the internal electrode assembly 3 and the liquid resistive medium 4. The transparent insulating material can be acrylic glass, transparent plastic, etc. A water outlet 13 is located at the bottom of the cavity assembly 1 for easy replacement of the liquid resistive medium 4. A valve can be installed at the water outlet 13, and the liquid can be discharged and replaced by controlling the opening and closing of the valve.

[0032] The steps for using this solution are as follows: S1: Fill the cavity assembly 1 with liquid resistive medium 4, detect the conductivity of liquid resistive medium 4, and adjust the conductivity to the range of 1.3mS / cm~2.3mS / cm so that a matching resistor of 90Ω is formed in the conductive channel 7. S2: Connect the input interface 14 of the input electrode plate 5 to the output terminal of the high voltage pulse power supply under test, and connect the BNC output terminal of the voltage signal acquisition module 8 to the oscilloscope 2. S3: Start the high-voltage pulse power supply, divide the high-voltage pulse voltage through the liquid resistor, and the voltage signal acquisition module 8 acquires the divided voltage signal at the output terminal and transmits it to the oscilloscope 2 to complete the measurement; S4: Read the voltage divider signal using oscilloscope 2 and calculate the actual output voltage of the high-voltage pulse power supply by combining it with the preset voltage divider ratio.

[0033] The implementation principle of this embodiment is as follows: By using a water-based conductive medium as the liquid resistor, combined with the effective contact area between the adjustable electrode assembly 3 and the water-based conductive medium, as well as a reasonable conductivity range and preset resistance value, the influence of electromagnetic interference on high-voltage pulse measurement is effectively avoided. Simultaneously, the shielded housing 9 of the voltage signal acquisition module 8 further enhances the anti-interference capability, enabling accurate and stable acquisition and transmission of voltage signals. The transparent cavity assembly 1 facilitates observation of the internal situation, and the outlet 13 facilitates replacement of the liquid resistor medium 4, improving the system's practicality and maintainability. Compared with traditional high-voltage pulse measurement methods, this system has significantly improved in terms of electromagnetic interference resistance, enhancing measurement accuracy and reliability, and providing a more effective solution for high-voltage pulse measurement. Example

[0034] 1. Device structure and assembly: The electromagnetic interference-free liquid resistance voltage divider high-voltage pulse measurement system of this embodiment has the following structure: Cavity assembly 1: A rectangular cavity with internal dimensions of 105mm in length, 40mm in width, and 160mm in height is formed by enclosing a transparent insulating acrylic sheet with a thickness of 8mm. The cavity is fixed with M6 stainless steel bolts and sealed with nitrile rubber sealing strips to prevent liquid leakage. An 8mm diameter water outlet 13 is machined at the bottom of the cavity and equipped with a sealing plug for replacing tap water and adjusting conductivity.

[0035] Electrode assembly 3 installation: The input electrode plate 5 and the output electrode plate 6 are both made of 6061 aluminum alloy plate with a thickness of 3mm, and the dimensions are 40mm wide and 160mm high, which are perfectly matched with the internal dimensions of the cavity assembly 1; the two electrode plates are fixed parallel and vertically to the left and right inner walls of the cavity with a spacing of 105mm, and are fastened to the acrylic plate by bolts to ensure the insulation and stability of the electrode plates and the cavity.

[0036] Liquid resistive medium 4 filling: Inject tap water into the cavity and use a conductivity meter to detect the conductivity of the tap water. Adjust it to 1.8 mS / cm (within the range of 1.3 mS / cm to 2.3 mS / cm). At this time, the liquid resistance between the two electrode plates is 90 Ω, which meets the impedance matching requirements. If the conductivity fluctuates, it can be compensated by adjusting the effective contact area of ​​the electrode plates (such as using the insulating shielding structure 12 to shield part of the electrode) to maintain a stable resistance value of 90 Ω.

[0037] Voltage signal acquisition module 8 installation: The voltage signal acquisition module 8 is fixed on the outside of the output electrode plate 6. The module adopts an integrated aluminum alloy shield with a thickness of 2mm, which completely covers the internal signal acquisition circuit and only reserves a BNC-K female output interface. The shield is connected to the grounding terminal of the cavity through a wire to achieve electromagnetic shielding. The input impedance of the acquisition module is 1MΩ, which, together with a 90Ω liquid resistor, forms a stable voltage division ratio.

[0038] 2. High-voltage pulse voltage measurement process: The output voltage of a 10kV high-voltage pulse power supply is measured using the above-mentioned device, and the steps are as follows: Preparation: Inject tap water into the cavity, test the conductivity to be 1.8 mS / cm, confirm the liquid resistance to be 90 Ω, and seal the inlet and outlet of the cavity 13; connect the input electrode plate 5 to the output terminal of the 10kV high-voltage pulse power supply through the high-voltage terminal of the input interface 14, and connect the BNC interface of the voltage signal acquisition module 8 to the oscilloscope 2 through a coaxial cable.

[0039] Shielding and grounding check: Confirm that the metal shielding cover is reliably connected to the cavity grounding terminal, and that oscilloscope 2 is properly grounded to avoid electromagnetic interference.

[0040] Measurement and data acquisition: The high-voltage pulse power supply is turned on, and the output pulse parameters are a high-voltage pulse with a pulse width of 1μs and a repetition frequency of 100Hz; the liquid resistor divides the high-voltage pulse, and the voltage signal acquisition module 8 acquires the voltage division signal at the output terminal and transmits it to the oscilloscope 2.

[0041] Data Calculation and Analysis: Oscilloscope 2 reads a voltage divider signal amplitude of 100V. Based on the voltage divider ratio (90Ω:1MΩ≈1:11111), the actual output voltage of the high-voltage pulse power supply is calculated to be 100V×11111≈11.1kV, with an error of less than 2% compared to the power supply's nominal value, and the measurement accuracy meets the requirements. At the same time, due to the electromagnetic shielding structure, the acquired waveform has no obvious interference noise, and the waveform distortion rate is less than 1%.

[0042] 3. Compatibility verification under different conductivities: The compatibility of the device was verified by adjusting the conductivity of tap water to 1.3 mS / cm and 2.3 mS / cm respectively. When the conductivity is 1.3 mS / cm, by increasing the effective contact area of ​​the electrode plate and adjusting the liquid resistance to 90 Ω, the measurement of a 10 kV high-voltage pulse shows an error of 1.8% and no waveform interference. When the conductivity is 2.3 mS / cm, by decreasing the effective contact area of ​​the electrode plate and adjusting the liquid resistance to 90 Ω, the measurement of a 10 kV high-voltage pulse shows an error of 1.5% and no waveform interference. The verification results show that the present invention can maintain a 90 Ω matching resistance within a wide conductivity range of 1.3 mS / cm to 2.3 mS / cm, ensuring measurement accuracy and anti-interference performance.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electromagnetic interference-free liquid resistance voltage-division high-voltage pulse measuring system comprising a cavity assembly (1) and an oscilloscope (2), characterized in that: The cavity assembly (1) is provided with an electrode assembly (3). The electrode assembly (3) includes an input electrode plate (5) and an output electrode plate (6) arranged opposite to each other, and a conductive channel (7) is formed between the input electrode plate (5), the output electrode plate (6) and the inner wall of the cavity assembly (1). The conductive channel (7) is filled with a liquid resistive dielectric (4). The output electrode plate (6) is electrically connected to a voltage signal acquisition module (8). The voltage signal acquisition module (8) and the oscilloscope (2) are electrically connected; The liquid resistive medium (4) is a water-based conductive medium; The conductivity of the water-based conductive medium is within a preset range, and the effective contact area between the electrode assembly (3) and the water-based conductive medium is configured to be adjustable, so that the equivalent resistance of the conductive channel (7) is determined by the combined effect of the conductivity and the effective conductive cross-sectional area and is kept within the preset range.

2. The system according to claim 1, characterized in that: The voltage signal acquisition module (8) includes a shielded shell (9), a signal acquisition unit (10), and a BNC output interface (11) connected to the output electrode plate (6). The shielded shell (9) is an integrated metal shield that is grounded.

3. The system according to claim 1, characterized in that: The conductive channel (7) has an open-top structure.

4. The system according to claim 3, characterized in that: The system also includes an insulating shielding structure (12) that is slidably disposed on the sidewalls of the input electrode plate (5) and the output electrode plate (6) facing the conductive channel (7).

5. The system according to claim 1, characterized in that: The input electrode plate (5) and the output electrode plate (6) are arranged in parallel, and the distance between the input electrode plate (5) and the output electrode plate (6) is a fixed distance.

6. The system according to claim 1, characterized in that: An input interface (14) is provided on the side wall of the input electrode plate (5) facing away from the conductive channel (7).

7. The system according to claim 1, characterized in that: The conductivity of the water-based conductive medium is from 1.3 mS / cm to 2.3 mS / cm.

8. The system according to claim 1, characterized in that: The preset resistance value of the conductive channel (7) is 90Ω.

9. The system according to claim 1, characterized in that: A water outlet (13) is provided below the cavity assembly (1).

10. The system according to claim 1, characterized in that: The cavity assembly (1) is a rectangular cavity made of transparent insulating material.

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