Composite shielding broadband current measurement method and system

Abstract

The invention discloses a composite shielding broadband current measurement method and device, and the method is carried out in a closed composite shielding structure, and comprises the steps: carrying out the measurement of a low-frequency current signal and a high-frequency current signal of a to-be-measured current signal; performing signal processing on the measured low-frequency current signal and the high-frequency current signal, and outputting a low-frequency digital signal and a high-frequency digital signal; and carrying out fusion processing on the low-frequency digital signal and the high-frequency digital signal, and outputting a measurement result of a broadband signal. According to the composite shielding broadband current measurement method and system provided by the invention, the shielding structure is optimized, the influence of external electromagnetic interference on a measurement signal is reduced, the anti-interference capability of the measurement system is improved, and meanwhile, the advanced signal processing technology is combined, so that high-accuracy current measurement in a broadband range is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of broadband current measurement, and more specifically, to a method and system for measuring broadband current with composite shielding. Background Art

[0002] Current measurement technology has wide applications in fields such as power systems, electronic devices, precision instruments, and industrial control. With the development of electronic technology and power electronics technology, the demand for broadband current measurement is increasing day by day. Especially in scenarios such as high-frequency signals, electromagnetic compatibility testing, and power quality monitoring, accurately measuring broadband current signals is crucial for the safety, stability, and performance optimization of the system.

[0003] The existing current measurement methods mainly include current transformers, shunt resistance methods, Hall effect sensors, and Rogowski coils. However, these traditional methods have certain limitations in broadband current measurement. For example, current transformers are mainly applicable to power frequency and low-frequency ranges and have poor high-frequency response; although the shunt resistance method can measure broadband signals, the influence of parasitic inductance causes high-frequency response distortion; Hall effect sensors are easily affected by temperature drift and external electromagnetic interference, and the measurement accuracy is limited; Rogowski coils have good high-frequency response characteristics, but their measurement ability for low-frequency and DC signals is weak. In addition, in a complex electromagnetic environment, the measurement device is easily affected by external electromagnetic interference, which affects the measurement accuracy.

[0004] Therefore, a technology is needed to measure the broadband current with composite shielding. Summary of the Invention

[0005] The technical solution of the present invention provides a method and system for measuring broadband current with composite shielding to solve the problem of how to measure broadband current.

[0006] To solve the above problems, the present invention provides a method for measuring broadband current with composite shielding. The method is carried out in a closed composite shielding structure and includes:

[0007] Measuring the low-frequency current signal and the high-frequency current signal of the current signal to be measured respectively;

[0008] Performing signal processing on the measured low-frequency current signal and high-frequency current signal, and outputting a low-frequency digital signal and a high-frequency digital signal;

[0009] Performing fusion processing on the low-frequency digital signal and the high-frequency digital signal, and outputting the measurement result of the broadband signal.

[0010] Preferably, the method includes:

[0011] Measure the high-frequency current signal of the current signal to be measured through a Rogowski coil; the measurement range of the high-frequency current signal is 1 kHz and above;

[0012] Measure the low-frequency current signal of the current signal to be measured through a Hall sensor; the measurement range of the low-frequency current signal is between 0 Hz and 1 kHz.

[0013] Preferably, the signal processing of the measured low-frequency current signal and high-frequency current signal includes:

[0014] Amplify the low-frequency current signal and the high-frequency current signal respectively with the same proportionality coefficient, filter the amplified low-frequency current signal and high-frequency current signal respectively, and convert the filtered low-frequency current signal and high-frequency current signal into the low-frequency digital signal and the high-frequency digital signal respectively.

[0015] Preferably, the fusion processing of the low-frequency digital signal and the high-frequency digital signal includes:

[0016] Align the sampling rates and timestamps of the low-frequency digital signal and the high-frequency digital signal;

[0017] Decompose the low-frequency digital signal and the high-frequency digital signal after the preset number of layers are aligned;

[0018] Select a preset number of decomposition layers, and perform weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient;

[0019] Perform wavelet inverse transform on the low-frequency digital signal and the high-frequency digital signal based on the fusion coefficient to generate a time-domain signal, and use the time-domain signal as the measurement result of the broadband signal.

[0020] Preferably, the step of selecting a preset number of decomposition layers, performing weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient includes:

[0021] At the k decomposition layer, perform weighted coefficient fusion on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient c (k) :

[0022]

[0023] where α is the weight of the low-frequency approximation coefficient.

[0024] Based on another aspect of the present invention, the present invention provides a broadband current measurement system with composite shielding, and the system includes: a Rogowski coil and a Hall sensor disposed in a closed composite shielding structure; the Rogowski coil is connected to a signal fusion module via a first signal processing module; the Hall sensor is connected to the signal fusion module via a second signal processing module;

[0025] The Rogowski coil is used to measure the high-frequency current signal of the current signal to be measured, output the measured high-frequency current signal to the first signal processing module for signal processing, and the first signal processing module outputs the high-frequency digital signal to the signal fusion module;

[0026] The Hall sensor is used to measure the low-frequency current signal of the current signal to be measured, output the measured low-frequency current signal to the second signal processing module for signal processing, and the second signal processing module outputs the low-frequency digital signal to the signal fusion module;

[0027] The signal fusion module is used to perform fusion processing on the low-frequency digital signal and the high-frequency digital signal, and output the measurement result of the broadband signal.

[0028] Preferably, the measurement range of the Rogowski coil for high-frequency current signals is 1 kHz and above; the measurement range of the Hall sensor for low-frequency current signals is between 0 Hz and 1 kHz.

[0029] Preferably, the composite shielding structure is, from the inside to the outside, a high magnetic permeability material layer, an insulating material layer, a high conductivity material layer, and an insulating material layer; the high magnetic permeability material layer, the insulating material layer, the high conductivity material layer, and the insulating material layer are closely adhered to each other;

[0030] The shape of the composite shielding structure is a shielding cover, and the high conductivity material layer of the composite shielding structure is grounded.

[0031] Preferably, the first signal processing module is used to perform signal processing on the high-frequency current signal, and is further used for:

[0032] The first signal processing module is used to perform amplification processing on the high-frequency current signal with a preset proportional coefficient, perform filtering processing on the amplified high-frequency current signal, and convert the filtered high-frequency current signal into the high-frequency digital signal.

[0033] Preferably, the second signal processing module is used to perform signal processing on the low-frequency current signal, and is further used for:

[0034] The second signal processing module is configured to amplify the low-frequency current signal by a preset proportional coefficient, filter the amplified low-frequency current signal, and convert the filtered low-frequency current signal into the low-frequency digital signal.

[0035] Preferably, the signal fusion module is configured to fuse the low-frequency digital signal and the high-frequency digital signal to output the measurement result of the broadband signal, and is further configured to:

[0036] Align the sampling rates and timestamps of the low-frequency digital signal and the high-frequency digital signal;

[0037] Decompose the low-frequency digital signal and the high-frequency digital signal after alignment of the preset number of layers;

[0038] Select a preset number of decomposition layers, and perform weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient;

[0039] Perform inverse wavelet transform on the low-frequency digital signal and the high-frequency digital signal based on the fusion coefficient to generate a time-domain signal, and use the time-domain signal as the measurement result of the broadband signal.

[0040] Preferably, the signal fusion module is configured to select a preset number of decomposition layers, perform weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient, and is further configured to:

[0041] At the k decomposition layer, for the low-frequency approximation coefficient and the high-frequency approximation coefficient perform weighted coefficient fusion to generate a fusion coefficient c (k) :

[0042]

[0043] where α is the weight of the low-frequency approximation coefficient.

[0044] On the other hand of the present invention, the present invention provides a computer-readable storage medium storing a computer program for executing a method for measuring broadband current with composite shielding.

[0045] On the other hand of the present invention, the present invention provides an electronic device, which includes: a processor and a memory; wherein,

[0046] The memory is used to store the instructions executable by the processor;

[0047] The processor is configured to read the executable instructions from the memory and execute the instructions to implement a wide-band current measurement method with composite shielding.

[0048] The technical solution of the present invention provides a wide-band current measurement method and system with composite shielding. The method is carried out in a closed composite shielding structure and includes: measuring the low-frequency current signal and the high-frequency current signal of the current signal to be measured respectively; performing signal processing on the measured low-frequency current signal and high-frequency current signal to output a low-frequency digital signal and a high-frequency digital signal; and performing fusion processing on the low-frequency digital signal and the high-frequency digital signal to output the measurement result of the wide-band signal. The technical solution of the present invention proposes a wide-band current measurement method and system with composite shielding. By optimizing the shielding structure, the present invention reduces the influence of external electromagnetic interference on the measurement signal, improves the anti-interference ability of the measurement system, and at the same time combines advanced signal processing technologies to achieve high-accuracy current measurement within a wide frequency band. The technical solution of the present invention provides a new solution for high-accuracy and high-reliability current measurement, meeting the requirements of the modern power electronics and electronic measurement fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The exemplary embodiments of the present invention can be more fully understood by referring to the following drawings:

[0050] Figure 1 FIG. is a flowchart of a wide-band current measurement method with composite shielding according to a preferred embodiment of the present invention; and

[0051] Figure 2 FIG. is a structural diagram of a wide-band current measurement system with composite shielding according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0052] Now, exemplary embodiments of the present invention will be described with reference to the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not limitations to the present invention. In the drawings, the same units / components are denoted by the same reference numerals.

[0053] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the ordinary meaning understood by those skilled in the art. Additionally, it can be understood that the terms defined in the commonly used dictionary should be understood as having a consistent meaning with the context of their related fields, and should not be understood as having an idealized or overly formal meaning.

[0054] Figure 1A flowchart of a composite shielding broadband current measurement method according to a preferred embodiment of the present invention.

[0055] The present invention aims to provide a composite shielding broadband current measurement method to solve the problems of insufficient anti-interference ability, limited measurement bandwidth, significant influence of parasitic parameters, and poor shielding effect in existing current measurement technologies for broadband measurement.

[0056] The present invention proposes a composite shielding broadband current measurement method. By optimizing the shielding structure, the present invention reduces the influence of external electromagnetic interference on the measurement signal and improves the anti-interference ability of the measurement system. At the same time, by combining advanced signal processing technologies, high-accuracy current measurement within a broadband range is achieved. The proposal of this technology will provide a new solution for high-accuracy and high-reliability current measurement, meeting the requirements of modern power electronics and electronic measurement fields.

[0057] As Figure 1 shown, the present invention provides a composite shielding broadband current measurement method, which is carried out in a closed composite shielding structure and includes:

[0058] Step 101: Measure the low-frequency current signal and the high-frequency current signal of the current signal to be measured respectively;

[0059] Preferably, the method includes:

[0060] Measure the high-frequency current signal of the current signal to be measured through a Rogowski coil; the measurement range of the high-frequency current signal is 1 kHz and above;

[0061] Measure the low-frequency current signal of the current signal to be measured through a Hall sensor; the measurement range of the low-frequency current signal is between 0 Hz and 1 kHz.

[0062] The Rogowski coil (high-frequency measurement unit) of the present invention:

[0063] Mainly used to measure high-frequency current (current signal above 1 kHz).

[0064] Wound with flexible materials to reduce the influence of parasitic inductance and improve the high-frequency response ability.

[0065] The Hall sensor (low-frequency measurement unit) of the present invention:

[0066] Mainly used to measure direct current and low-frequency current (0 Hz - 1 kHz).

[0067] Adopt high-sensitivity and low-drift Hall elements to improve the measurement accuracy of direct current and low frequency.

[0068] Step 102: Process the measured low-frequency current signal and high-frequency current signal, and output a low-frequency digital signal and a high-frequency digital signal;

[0069] Preferably, the measured low-frequency current signal and high-frequency current signal are subjected to signal processing, including:

[0070] The low-frequency current signal and high-frequency current signal are respectively amplified with the same proportional coefficient, the amplified low-frequency current signal and high-frequency current signal are respectively filtered, and the filtered low-frequency current signal and high-frequency current signal are respectively converted into low-frequency digital signals and high-frequency digital signals.

[0071] The signal processing module in the present invention includes three signal processing circuits.

[0072] Amplification circuit: preliminarily amplify the Hall sensor and Rogowski coil signals, improve the signal-to-noise ratio, and make the output proportional coefficients the same. Filtering circuit: filter out ultra-high frequency interference signals. Analog-to-digital conversion (ADC) circuit: convert analog signals into digital signals for subsequent processing.

[0073] Step 103: Perform fusion processing on the low-frequency digital signal and high-frequency digital signal, and output the measurement result of the broadband signal.

[0074] Preferably, the fusion processing of the low-frequency digital signal and high-frequency digital signal includes:

[0075] Align the sampling rates and timestamps of the low-frequency digital signal and high-frequency digital signal;

[0076] Decompose the aligned low-frequency digital signal and high-frequency digital signal with a preset number of layers;

[0077] Select a preset number of decomposition layers, and perform weighted coefficient fusion on the low-frequency digital signal and high-frequency digital signal based on the low-frequency approximation coefficient and high-frequency approximation coefficient to generate a fusion coefficient;

[0078] Perform inverse wavelet transform on the low-frequency digital signal and high-frequency digital signal based on the fusion coefficient to generate a time-domain signal, and use the time-domain signal as the measurement result of the broadband signal.

[0079] Preferably, selecting a preset number of decomposition layers, and performing weighted coefficient fusion on the low-frequency digital signal and high-frequency digital signal based on the low-frequency approximation coefficient and high-frequency approximation coefficient to generate a fusion coefficient, includes:

[0080] At the k decomposition layer, perform weighted coefficient fusion on the low-frequency approximation coefficient and high-frequency approximation coefficient to generate a fusion coefficient c (k) :

[0081]

[0082] Among them, α is the weight of the low-frequency approximation coefficient.

[0083] The data fusion module of the present invention adopts a signal processing method based on the wavelet transform algorithm, combines the low-frequency signal of the Hall sensor and the high-frequency signal of the Rogowski coil, and forms a high-accuracy broadband current measurement result.

[0084] The composite shielding structure of the present invention adopts a multi-layer shielding structure, including a high magnetic permeability material layer, a conductive material layer and an insulating material layer, which effectively suppresses external electromagnetic interference.

[0085] The data fusion module of the present invention is mainly used for:

[0086] 1. Pretreatment: Ensure that the sampling rates and timestamps of the two sensors are aligned, and adjust the signals to the same magnitude.

[0087] 2. Wavelet decomposition: Perform wavelet decomposition on the two signals. The decomposition level N is divided according to the target frequency band. The low-frequency approximation coefficients (Approximation Coefficients, cA) retain the Hall sensor data. The high-frequency detail coefficients (Detail Coefficients, cD) retain the Rogowski coil data.

[0088] 3. Adopt the weighted fusion method for coefficient fusion, and weight and fuse the coefficients in the intermediate frequency band (such as the k-th layer) to avoid mutations:

[0089]

[0090] The weight α can be dynamically adjusted according to the signal-to-noise ratio of the frequency band or the characteristics of the sensor.

[0091] 4. Wavelet reconstruction: Use the fused coefficients for wavelet inverse transform to generate a time-domain signal, and adopt symmetric extension or periodic extension to reduce the edge effect.

[0092] A composite shielding broadband current measurement method provided by the present invention realizes high-accuracy and broadband current measurement through composite sensing, data fusion and shielding optimization, and has the following advantages:

[0093] Broadband measurement: Combine the Hall sensor (low frequency) and the Rogowski coil (high frequency) to achieve broadband current measurement from DC to MHz level, and improve the measurement coverage.

[0094] High accuracy: Adopt an adaptive data fusion algorithm to compensate for sensor errors, reduce amplitude distortion and phase drift, and improve measurement accuracy.

[0095] Strong anti-interference ability: Through the composite shielding structure (high magnetic permeability layer + conductive layer + insulating layer), effectively shield external electromagnetic interference and ensure signal stability.

[0096] Miniaturization and low power consumption: Optimize the circuit design to make the device lighter and more portable while reducing power consumption, suitable for portable measurement and embedded applications.

[0097] Wide applicability: Applicable to power systems, electronic testing, electromagnetic compatibility (EMC) measurement, motor control and other fields, capable of accurately measuring complex signals such as pulsed current and harmonic current.

[0098] High reliability: Optimize temperature compensation and signal processing to adapt to different environments and ensure long-term stable operation.

[0099] This invention breaks through the limitations of traditional measurement technologies, achieving comprehensive optimization of wide frequency, high precision, strong anti-interference and miniaturization, and enhancing the stability and applicability of the measurement system.

[0100] The composite shielding structure of this invention: Adopt a stacked design of multiple layers of materials (high magnetic permeability layer, conductive layer, insulating layer), and optimize shielding for electromagnetic interference in different frequency bands.

[0101] The wide-frequency measurement technology of this invention: Combine a hybrid sensing scheme of Rogowski coil (high frequency) and Hall sensor (low frequency) to cover current signals from DC to MHz level.

[0102] The data fusion algorithm of this invention: A weighted fusion method based on wavelet transform, dynamically adjust the weight coefficient (such as α = 0.4) to achieve seamless fusion of high- and low-frequency signals.

[0103] The signal processing module of this invention: Integrate amplification, filtering and analog-to-digital conversion circuits to improve the signal-to-noise ratio and eliminate high-frequency interference.

[0104] The wide-frequency current measurement method in this invention:

[0105] Use a Rogowski coil to measure high-frequency signals (≥1 kHz) and a Hall sensor to measure low-frequency and DC signals (0 Hz - 1 kHz).

[0106] Generate a wide-frequency time-domain signal through wavelet decomposition (such as db4 basis, decomposition level n = 5) and weighted fusion algorithm (dynamically adjust α).

[0107] Preprocessing steps: Align the sampling rate and timestamp, and normalize the signal magnitude.

[0108] The implementation method of composite shielding in this invention:

[0109] Stacking order of multiple layers of materials (high magnetic permeability layer → insulating layer → conductive layer → insulating layer).

[0110] The grounding design of the shielding cover to discharge the induced current to enhance the shielding effectiveness.

[0111] Using the broadband current measurement method provided by the present invention, a specific current waveform is measured:

[0112] The broadband current measurement device provided by the present invention is inserted through the current-carrying loop of the measured current, and the output end of the measurement device is connected to an oscilloscope or other waveform display device.

[0113] In the present invention, the Rogowski coil and the Hall sensor respectively sense the current to generate electrical signals. The two electrical signals enter the signal processing module, and after amplification, filtering, and analog-to-digital conversion, the signals are output to the signal fusion module.

[0114] In the present invention, the signal fusion module aligns the sampling rates and timestamps of the two signals and adjusts the signals to the same magnitude. The signal fusion module uses the db4 wavelet basis to decompose the two signals, and the decomposition level n = 5. According to the characteristics of the selected Hall sensor, α = 0.4 is used to calculate the weighted fusion coefficient, and the inverse wavelet transform is performed using the fused coefficient to generate a time-domain signal.

[0115] In the present invention, the oscilloscope reads this time-domain signal as the measurement result.

[0116] Since the entire set of measurement components is within the composite shielding enclosure, the measurement results of this time will not be affected by external electromagnetic interference.

[0117] Figure 2 It is a structural diagram of a composite shielding broadband current measurement system according to a preferred embodiment of the present invention.

[0118] As Figure 2 shown, the present invention provides a composite shielding broadband current measurement system, which includes: a Rogowski coil and a Hall sensor arranged in a closed composite shielding structure; the Rogowski coil is connected to the signal fusion module via a first signal processing module ( Figure 2 signal processing module 1 in Figure 2 ); the Hall sensor is connected to the signal fusion module via a second signal processing module (

[0119] signal processing module 2 in

[0120] Preferably, the measurement range of the Rogowski coil for high-frequency current signals is 1 kHz and above; the measurement range of the Hall sensor for low-frequency current signals is between 0 Hz and 1 kHz.

[0121] The Rogowski coil is used to measure high-frequency current signals of the measured current signal, and the measured high-frequency current signal is output to the first signal processing module for signal processing. The first signal processing module outputs the high-frequency digital signal to the signal fusion module;

[0122] The first signal processing module is used to amplify the high-frequency current signal by a preset proportional coefficient, filter the amplified high-frequency current signal, and convert the filtered high-frequency current signal into a high-frequency digital signal.

[0123] The Hall sensor in the present invention is used to measure the low-frequency current signal of the current signal to be measured, output the measured low-frequency current signal to the second signal processing module for signal processing, and the second signal processing module outputs the low-frequency digital signal to the signal fusion module;

[0124] Preferably, the second signal processing module is used to process the low-frequency current signal and also used for:

[0125] The second signal processing module is used to amplify the low-frequency current signal by a preset proportional coefficient, filter the amplified low-frequency current signal, and convert the filtered low-frequency current signal into a low-frequency digital signal.

[0126] The signal fusion module of the present invention is used to fuse the low-frequency digital signal and the high-frequency digital signal and output the measurement result of the broadband signal.

[0127] Preferably, the signal fusion module is used to fuse the low-frequency digital signal and the high-frequency digital signal, output the measurement result of the broadband signal, and also used for:

[0128] Align the sampling rates and timestamps of the low-frequency digital signal and the high-frequency digital signal;

[0129] Decompose the low-frequency digital signal and the high-frequency digital signal after aligning the preset number of layers;

[0130] Select the preset number of decomposition layers, and perform weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient;

[0131] Perform wavelet inverse transform on the low-frequency digital signal and the high-frequency digital signal based on the fusion coefficient to generate a time-domain signal, and use the time-domain signal as the measurement result of the broadband signal.

[0132] Preferably, the signal fusion module is used to select the preset number of decomposition layers, perform weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient, and also used for:

[0133] At the k decomposition layer, perform weighted coefficient fusion on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient c (k) :

[0134]

[0135] Among them, α is the weight of the low-frequency approximation coefficient.

[0136] Preferably, the composite shielding structure is, from the inside to the outside, a high magnetic permeability material layer, an insulating material layer, a high conductive material layer, and an insulating material layer in sequence; the high magnetic permeability material layer, the insulating material layer, the high conductive material layer, and the insulating material layer are closely adhered to each other;

[0137] The shape of the composite shielding structure is a shielding cover, and the high conductive material layer of the composite shielding structure is grounded.

[0138] The connection diagram of the components of the system of the present invention is as shown in the appendix Figure 2 as follows, and the specific connection method is:

[0139] The Rogowski coil and the Hall sensor share an insulating skeleton, and two groups of coils are closely wound on the insulating skeleton. One group is input to the Rogowski coil integrator, and one group is input to the Hall sensor.

[0140] The signals output by the integrator of the Rogowski coil and the Hall sensor are input to the signal processing module, and the signal processing module processes these two signals and outputs two digital signals.

[0141] The digital signals of the Rogowski coil and the Hall sensor enter the data fusion module. Based on the frequency response characteristics of the Rogowski coil and the Hall sensor, a data fusion algorithm is used to fuse and process the two digital signals, and a broadband current signal is output. This signal is used as the output of the entire device.

[0142] The composite shielding structure includes the coil, the sensor, the signal processing module, and the data fusion module inside, forming an electromagnetic shielding structure.

[0143] The composite shielding structure provided by the present invention is composed of multiple layers of different materials, and each layer of material shields interference in a specific frequency band.

[0144] 1. Material selection:

[0145] High magnetic permeability material layer:

[0146] Materials: Permalloy, ferrite, nanocrystalline alloy, etc.

[0147] Function: mainly used to shield low-frequency magnetic field interference (such as 50Hz power frequency interference).

[0148] Thickness: usually 0.1mm - 1mm, and the specific thickness is determined according to the shielding requirements.

[0149] High conductive material layer:

[0150] Materials: conductive metals such as copper, aluminum, and silver.

[0151] Function: mainly used to shield high-frequency electromagnetic interference (such as radio frequency interference).

[0152] Thickness: usually 0.05mm - 0.5mm.

[0153] Insulating material layer:

[0154] Materials: polyimide, polytetrafluoroethylene (PTFE), epoxy resin, etc.

[0155] Function: isolate different shielding layers, prevent short circuits between layers, and provide mechanical support at the same time.

[0156] Thickness: usually 0.1mm - 0.5mm.

[0157] 2. Structural design:

[0158] Multi-layer stacked structure:

[0159] From the inside to the outside, it is in turn: high magnetic permeability material layer → insulating material layer → high conductive material layer → insulating material layer. Each layer is closely adhered to avoid air gaps.

[0160] Shape of the shielding cover:

[0161] Design the shielding cover according to the shape of the internal component structure to ensure that the shielding cover completely wraps the sensitive components (such as Rogowski coils and Hall sensors).

[0162] Grounding design:

[0163] Ground the high conductive material layer to discharge the induced current and enhance the shielding effect.

[0164] 3. Manufacturing process:

[0165] Multi-layer stacked structure:

[0166] From the inside to the outside, it is in turn: high magnetic permeability material layer → insulating material layer → high conductive material layer → insulating material layer. Each layer is closely adhered to avoid air gaps. [[ID=Q8]]

[0167] Shape of the shielding cover:

[0168] Design the shielding cover according to the shape of the measuring device. Common shapes include cylindrical, rectangular or annular. Ensure that the shielding cover completely wraps the sensitive components (such as Rogowski coils and Hall sensors).

[0169] Grounding design:

[0170] Ground the high conductive material layer to discharge the induced current and enhance the shielding effect.

[0171] The composite shielding structure of the present invention:

[0172] Material selection: Permalloy / ferrite (permeability layer), copper / aluminum (conductive layer), polyimide / PTFE (insulating layer).

[0173] Structural design: Completely wrap the sensitive components (such as coils, sensors) to avoid air gaps between layers.

[0174] The hybrid sensing device of the present invention:

[0175] The Rogowski coil and the Hall sensor share an insulating skeleton and closely wind two sets of coils.

[0176] The circuit configuration of the signal processing module (amplification, filtering, ADC circuit).

[0177] The data fusion module of the present invention:

[0178] Hardware implementation of the fusion algorithm based on wavelet transform (such as FPGA or application-specific integrated circuit).

[0179] Dynamic weight adjustment mechanism (according to signal-to-noise ratio or sensor characteristics).

[0180] The present invention provides a computer-readable storage medium storing a computer program for executing a method for measuring broadband current with composite shielding.

[0181] The present invention provides an electronic device, which includes: a processor and a memory; wherein,

[0182] The memory for storing the executable instructions of the processor;

[0183] The processor for reading the executable instructions from the memory and executing the instructions to implement a method for measuring broadband current with composite shielding.

[0184] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented in various computer languages, for example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript, etc.

[0185] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce means for implementing the functions specified in a process Figure 1 one process or multiple processes and / or blocks Figure 1 or means for implementing the functions specified in multiple blocks.

[0186] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufacture including instruction means that implement the functions specified in a process Figure 1 one process or multiple processes and / or blocks Figure 1 or means for implementing the functions specified in multiple blocks.

[0187] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in a process Figure 1 one process or multiple processes and / or blocks Figure 1 or means for implementing the functions specified in multiple blocks.

[0188] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0189] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

[0190] The present invention has been described by referring to a few embodiments. However, as is well known to those skilled in the art, as defined by the appended patent claims, other embodiments equivalent to those disclosed above of the present invention equally fall within the scope of the present invention.

[0191] Generally, all terms used in the claims are construed according to their ordinary meaning in the technical field, unless otherwise expressly defined therein. All references to "a / the [device, component, etc.]" are to be construed openly as at least one instance of the device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed, unless expressly stated.

Claims

1. A composite shielded broadband current measurement method, the method being performed in a closed composite shielded structure, comprising: Performing measurements on the low-frequency current signal and the high-frequency current signal of the current signal to be measured respectively; Processing the measured low-frequency current signal and high-frequency current signal to output a low-frequency digital signal and a high-frequency digital signal; The low-frequency digital signal and the high-frequency digital signal are fused and processed, and a measurement result of a broadband signal is output.

2. The method according to claim 1, comprising: Measuring a high-frequency current signal of the current signal to be measured by a Rogowski coil; the measurement range of the high-frequency current signal is 1 kHz and above; The low-frequency current signal of the current signal to be measured is measured by a Hall sensor; the measurement range of the low-frequency current signal is between 0 Hz and 1 kHz.

3. The method according to claim 1, wherein the signal processing of the measured low-frequency current signal and the high-frequency current signal comprises: The low-frequency current signal and the high-frequency current signal are amplified by the same proportional coefficient, the amplified low-frequency current signal and the high-frequency current signal are filtered, and the filtered low-frequency current signal and the high-frequency current signal are converted into the low-frequency digital signal and the high-frequency digital signal, respectively.

4. The method according to claim 1, wherein fusing the low-frequency digital signal and the high-frequency digital signal comprises: Aligning the sampling rates and timestamps of the low-frequency digital signal and the high-frequency digital signal; Decomposing the low-frequency digital signal and the high-frequency digital signal after the preset number of layers are aligned; Selecting a preset number of decomposition layers, performing weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient, and generating a fusion coefficient; Based on the fusion coefficient, wavelet inverse transform is performed on the low-frequency digital signal and the high-frequency digital signal to generate a time domain signal, and the time domain signal is used as a measurement result of the broadband signal.

5. The method according to claim 4, wherein selecting a preset number of decomposition layers and performing weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient comprises: At the k decomposition level, the low-frequency approximation coefficients and high frequency approximation coefficients Perform weighted coefficient fusion to generate fusion coefficient c (k) : Among them, α is the low-frequency approximation coefficient weight.

6. A composite shielded broadband current measurement system, comprising: A Rogowski coil and a Hall sensor are provided in a closed composite shielding structure; the Rogowski coil is connected to a signal fusion module via a first signal processing module; the Hall sensor is connected to a signal fusion module via a second signal processing module; The Rogowski coil is used to measure a high-frequency current signal of a current signal to be measured, and output the measured high-frequency current signal to the first signal processing module for signal processing, and the first signal processing module outputs a high-frequency digital signal to the signal fusion module; The Hall sensor is used to measure the low-frequency current signal of the current signal to be measured, and output the measured low-frequency current signal to the second signal processing module for signal processing, and the second signal processing module outputs the low-frequency digital signal to the signal fusion module; The signal fusion module is used to fuse the low-frequency digital signal and the high-frequency digital signal and output a measurement result of a broadband signal.

7. The system according to claim 6, wherein the Rogowski coil has a measurement range of 1 kHz and above for high-frequency current signals; and the Hall sensor has a measurement range of 0 Hz to 1 kHz for low-frequency current signals.

8. The system according to claim 6, wherein the composite shielding structure comprises, from the inside to the outside, a high magnetic permeability material layer, an insulating material layer, a high conductive material layer, and an insulating material layer; the high magnetic permeability material layer, the insulating material layer, the high conductive material layer, and the insulating material layer are tightly attached to each other; The composite shielding structure is in the shape of a shielding cover, and the high-conductivity material layer of the composite shielding structure is grounded.

9. The system according to claim 6, wherein the first signal processing module is configured to perform signal processing on the high-frequency current signal, and further configured to: The first signal processing module is used to amplify the high-frequency current signal with a preset proportional coefficient, filter the amplified high-frequency current signal, and convert the filtered high-frequency current signal into the high-frequency digital signal.

10. The system according to claim 6, wherein the second signal processing module is configured to perform signal processing on the low-frequency current signal, and further configured to: The second signal processing module is used to amplify the low-frequency current signal by a preset proportional coefficient, filter the amplified low-frequency current signal, and convert the filtered low-frequency current signal into the low-frequency digital signal.

11. The system according to claim 6, wherein the signal fusion module is configured to fuse the low-frequency digital signal and the high-frequency digital signal to output a measurement result of a broadband signal, and is further configured to: Aligning the sampling rates and timestamps of the low-frequency digital signal and the high-frequency digital signal; Decomposing the low-frequency digital signal and the high-frequency digital signal after the preset number of layers are aligned; Selecting a preset number of decomposition layers, performing weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient, and generating a fusion coefficient; Based on the fusion coefficient, wavelet inverse transform is performed on the low-frequency digital signal and the high-frequency digital signal to generate a time domain signal, and the time domain signal is used as a measurement result of the broadband signal.

12. The system according to claim 11, wherein the signal fusion module is configured to select a preset number of decomposition levels, perform weighted coefficient fusion on the low-frequency digital signal and the high-frequency digital signal based on the low-frequency approximation coefficient and the high-frequency approximation coefficient to generate a fusion coefficient, and is further configured to: At the k decomposition level, the low-frequency approximation coefficients and high frequency approximation coefficients Perform weighted coefficient fusion to generate fusion coefficient c (k) : in, α is the low-frequency approximation coefficient weight.

13. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 5.

14. An electronic device, characterized in that: The electronic device includes: a processor and a memory; wherein, The memory is a memory for storing instructions executable by the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 1 to 5.

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