Method for determining current detection coil parameters and method for detecting conductor current distribution

Abstract

The present application provides a method for determining parameters of a current detection coil and a method for detecting the current distribution of a conductor. The method includes: presetting virtual detection parameters at least according to the size of the conductor to be measured, where the virtual detection parameters at least include virtual model parameters and performance parameters of the virtual coil; determining the true performance parameters of the current detection coil based on Faraday's law of electromagnetic induction according to the virtual detection parameters, and the true performance parameters of the current detection coil are used to fabricate the current detection coil, and the current detection coil is used to detect the current distribution of the conductor to be measured. The current detection coil fabricated by using the performance parameters obtained by this method has high sensitivity to the current in the detection area and high shielding ability to the current in the non-detection area, realizing non-invasive detection with high recognition ability for local current. And this method can customize the required performance of the coil according to different usage scenarios, and has a wide range of applications.

Description

Technical Field

[0001] The present application relates to the field of current measurement. Specifically, it relates to a method for determining parameters of a current detection coil and a method for detecting the current distribution of a conductor. Background Art

[0002] When measuring the current of a conductor, it is necessary to arrange a current detector around the conductor to be measured. In some fields of research on the current distribution of conductors, there is often no space around the conductor to be measured for arranging a current detector, and it is difficult to obtain the current distribution of the conductor.

[0003] For power electronic devices such as integrated gate-commutated thyristors (IGCTs), the current distribution of their chips is affected by various factors. In order to study the current distribution law of power electronic devices, it is necessary to arrange a current detection device. However, the packaging structure of power electronic devices is compact and the internal space is narrow, making it difficult to arrange detection equipment. Therefore, it is necessary to arrange a current detection device non-invasively outside the device to evaluate the current distribution of the semiconductor chip.

[0004] Existing methods usually arrange several magnetic field detection devices outside, and by detecting the magnetic field amplitudes at several points around the conductor and using a current reconstruction algorithm, the current distribution of the conductor is inversely calculated. However, the measurement points of the magnetic field detector array in the existing methods are few, resulting in poor current recognition ability between the detection area and the non-detection area. Summary of the Invention

[0005] The main purpose of the present application is to provide a method for determining parameters of a current detection coil and a method for detecting the current distribution of a conductor, so as to at least solve the problem in the prior art that the few measurement points of the magnetic field detection device of the conductor result in poor current recognition ability between the detection area and the non-detection area.

[0006] To achieve the above object, according to one aspect of the present application, a method for determining parameters of a current detection coil is provided, including: presetting virtual detection parameters at least according to the size of the conductor to be measured, where the virtual detection parameters at least include virtual model parameters and performance parameters of a virtual coil; determining the real performance parameters of the current detection coil based on Faraday's law of electromagnetic induction according to the virtual detection parameters, the real performance parameters of the current detection coil being used to prepare the current detection coil, and the current detection coil being used to detect the current distribution of the conductor to be measured.

[0007] Optionally, the virtual detection parameters at least include the virtual position of the current to be measured, the virtual position of the interfering current, the virtual position of the coil, the virtual turn density at each position on the virtual coil, and the virtual turn direction at each position on the virtual coil. The real performance parameters at least include the position of the current detection coil, the real turn density at each position on the current detection coil, and the real turn direction at each position on the current detection coil. Based on Faraday's law of electromagnetic induction, the real performance parameters of the current detection coil are determined according to the virtual detection parameters, including: obtaining a first mutual inductance matrix and a second mutual inductance matrix based on Faraday's law of electromagnetic induction. The first mutual inductance matrix is the mutual inductance matrix between the virtual position of the current to be measured and the virtual turns at each position on the virtual coil, and the second mutual inductance matrix is the mutual inductance matrix between the virtual position of the interfering current and the virtual turns at each position on the virtual coil; an optimization function is established according to the first mutual inductance matrix and the second mutual inductance matrix, and the optimal turn density distribution of the current detection coil is used as the objective for solution to obtain the real performance parameters.

[0008] Optionally, obtaining a first mutual inductance matrix and a second mutual inductance matrix based on Faraday's law of electromagnetic induction includes: obtaining a mutual inductance formula , where is the mutual inductance between the conductor to be measured and a single turn, is the magnetic permeability of air, a is the absolute height of the turn, is the distance between the conductor to be measured and the outer edge of the virtual coil, is the distance between the conductor to be measured and the inner edge of the virtual coil; according to the mutual inductance formula, the first mutual inductance matrix and the second mutual inductance matrix are determined. The number of rows of the first mutual inductance matrix is the number of virtual positions of the current to be measured, the number of rows of the second mutual inductance matrix is the number of virtual positions of the interfering current, the number of columns of the first mutual inductance matrix and the number of columns of the second mutual inductance matrix are both the number of turns of the virtual coil. The element in the i-th row and j-th column of the first mutual inductance matrix is the mutual inductance between the i-th virtual position of the current to be measured and the j-th virtual turn, and the element in the i-th row and j-th column of the second mutual inductance matrix is the mutual inductance between the i-th virtual position of the interfering current and the j-th virtual turn.

[0009] Optionally, an optimization function is established based on the first mutual inductance matrix and the second mutual inductance matrix, and the optimization function is solved with the optimal turn density distribution of the current detection coil as the objective to obtain the true performance parameters, including: determining optimization parameters based on the first mutual inductance matrix and the second mutual inductance matrix, and establishing an optimization function based on the optimization parameters, where the optimization parameters at least include: the sensitivity of the virtual coil to the current in the measured area of the conductor to be measured, the shielding ability of the coil to the current in the non-measured area of the conductor to be measured, and the stability of the detection level of the virtual coil at each position in the measured area of the conductor to be measured; solving with the objective of minimizing the optimization function to obtain the true performance parameters.

[0010] Optionally, establishing an optimization function based on the first mutual inductance matrix and the second mutual inductance matrix includes: establishing an optimization function based on the first mutual inductance matrix and the second mutual inductance matrix , where is the true turn density at each position on the current detection coil and the true turn direction at each position on the current detection coil, and are the upper limit and the lower limit of the true turn density at each position on the current detection coil respectively, is the first mutual inductance matrix, is the second mutual inductance matrix, n is the number of turns of the virtual coil, m1 is the number of virtual measured current positions, m2 is the number of virtual interference current positions, C 1 is the first weighting coefficient, C 2 is the second weighting coefficient.

[0011] Optionally, there are multiple current detection coils and multiple virtual coils, and the current detection coils and the virtual coils are in one-to-one correspondence. At least virtual detection parameters are preset according to the size of the conductor to be measured, including: determining the positions of the virtual coils according to the number of the current detection coils and the size of the conductor to be measured; determining the virtual measured current positions and virtual interference current positions corresponding to each virtual coil according to the number of the current detection coils and the area to be measured of the conductor to be measured.

[0012] Optionally, virtual detection parameters are preset at least according to the size of the conductor under test, including: obtaining historical detection parameters, where the historical detection parameters at least include the position of the historical real coil, the turn density at each position on the historical real coil, and the turn direction at each position on the historical real coil. The historical real coil is a coil used to detect the current distribution of the conductor under test at a historical moment; according to the size of the conductor under test and the historical detection parameters, determine the position of the virtual coil, the virtual turn density at each position on the virtual coil, and the virtual turn direction at each position on the virtual coil. Among them, the virtual turn direction at each position on the virtual coil is a positive turn, and the distance between the virtual coil and the conductor under test is less than or equal to a preset distance.

[0013] Optionally, the method for determining the parameters of the current detection coil runs in a simulation system.

[0014] According to another aspect of the present application, a method for detecting the current distribution of a conductor is provided, including: using a current detection coil to detect the current at each measured current position of the conductor under test, and the performance parameters of the current detection coil are determined by using any one of the methods for determining the parameters of the current detection coil.

[0015] Optionally, using a current detection coil to detect the current at each measured current position of the conductor under test includes: using the current detection coil to collect a coil differential signal proportional to the current change rate; sequentially performing voltage follower processing, proportional amplification processing, passive integration processing, and active integration processing on the coil differential signal to obtain a voltage signal proportional to the current amplitude; determining the current at each measured current position of the conductor under test according to the voltage signal.

[0016] Applying the technical solution of the present application, the above method for determining the parameters of the current detection coil first presets virtual detection parameters at least according to the size of the conductor under test. Among them, the virtual detection parameters at least include virtual model parameters and the performance parameters of the virtual coil; then, based on Faraday's law of electromagnetic induction, according to the virtual detection parameters, determine the real performance parameters of the current detection coil. The real performance parameters of the current detection coil are used to prepare the current detection coil, and the current detection coil is used to detect the current distribution of the conductor under test. The current detection coil prepared with the performance parameters obtained by this method has high sensitivity to the current in the detection area and high shielding ability to the current in the non-detection area, realizing non-invasive detection with high recognition ability for local current. And this method can customize the required performance of the coil according to different usage scenarios, has a wide range of applications, and solves the problem in the prior art that the magnetic field detection device of the conductor has fewer measurement points, resulting in poor current recognition ability between the detection area and the non-detection area. Description of the Drawings

[0017] The accompanying drawings of the specification, which form a part of this application, are used to provide a further understanding of this application. The schematic embodiments and descriptions thereof of this application are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0018] Figure 1 A flowchart showing a method for determining parameters of a current detection coil provided according to an embodiment of this application;

[0019] Figure 2 A schematic structural diagram of a virtual model provided according to an embodiment of this application;

[0020] Figure 3 A schematic diagram showing the corresponding relationship between a current detection coil and a corresponding current region to be detected provided according to an embodiment of this application;

[0021] Figure 4 A schematic diagram showing different winding directions of turns provided according to an embodiment of this application;

[0022] Figure 5 A flowchart showing a method for detecting conductor current distribution provided according to an embodiment of this application;

[0023] Figure 6 A flowchart showing each link of an integrator for signal conversion provided according to an embodiment of this application. Detailed implementation manners

[0024] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0026] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] As introduced in the background art, in the prior art, when measuring the conductor current, a current detector such as a Rogowski coil needs to be arranged around the conductor to be measured. In some fields of research on the current distribution of conductors, there is often no space around the conductor to be measured for arranging the current detector, and it is difficult to obtain the current distribution of the conductor. For power electronic devices such as integrated gate-commutated thyristors (IGCTs), the current distribution of their chips is affected by various factors. In order to study the current distribution law of power electronic devices, it is necessary to arrange current detection devices such as Rogowski coils. However, the packaging structure of power electronic devices is compact and the internal space is narrow, making it difficult to arrange detection equipment. Therefore, it is necessary to arrange a current detection device non-invasively outside the device to evaluate the current distribution of the semiconductor chip. The three-phase cable for power transmission contains three wires conducting phase current, and there is a need to measure the phase current in each conductor in engineering. However, due to the need to ensure the insulation performance of the cable, the insulation protection layer of the three-phase cable cannot be damaged, and there is no space for invasive arrangement of the current detector. Therefore, it is necessary to arrange a current detection device non-invasively outside the three-phase cable to evaluate the magnitude of the phase current in the three-phase cable.

[0028] The existing methods usually arrange several magnetic field detection devices outside, detect the magnetic field amplitudes at several points around the conductor, and use the current reconstruction algorithm to inversely calculate the current distribution of the conductor.

[0029] There are two main problems with the existing methods. One is that the measurement points of the magnetic field detector array in the existing methods are few, resulting in the need to improve the current recognition ability between the detection area and the non-detection area. Secondly, the measurement results of the existing methods cannot be directly used and need to go through a post-processing process to obtain the current distribution through the current reconstruction algorithm, which increases the workload.

[0030] To solve the problem that the few measurement points of the magnetic field detection device for the conductor in the prior art result in poor current recognition ability between the detection area and the non-detection area, the embodiments of the present application provide a method for determining the parameters of a current detection coil and a method for detecting the conductor current distribution.

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] In this embodiment, a method for determining the parameters of a current detection coil operating on a mobile terminal, a computer terminal, or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0033] Figure 1 It is a flowchart of a method for determining the parameters of a current detection coil according to an embodiment of the present application. As Figure 1 shown, the method includes the following steps:

[0034] Step S101, preset virtual detection parameters at least according to the size of the conductor to be measured, where the virtual detection parameters at least include virtual model parameters and performance parameters of the virtual coil;

[0035] Specifically, in order to accurately determine the turn density and turn direction at each position on the current detection coil, as well as the installation position of the current detection coil, it is necessary to first conduct a simulation experiment in a simulation system, that is, the method for determining the parameters of the current detection coil runs in the simulation system. Through the simulation experiment results, the turn density and turn direction at each position on the current detection coil with the best detection effect are calculated. Among them, the detection effect is at least reflected by parameters such as the current sensitivity of the detection area and the shielding ability of the current in the non-detection area. For example: if the current detection coil has a higher sensitivity to the current in the detection area and a higher shielding ability to the current in the non-detection area, the detection effect is better.

[0036] When conducting a simulation experiment on non-invasive current distribution, it is first necessary to establish a virtual model according to the actual size and geometric shape of the conductor to be measured. It is used to reproduce the electromagnetic environment inside and around the conductor to be measured. The virtual model parameters should at least include the size, shape, material properties (such as resistivity, permeability) of the conductor, and the estimated current distribution, etc. These parameters are crucial for accurately calculating the mutual inductance matrix between the sensor (such as a coil) and the conductor, thus directly affecting the accuracy and sensitivity of the measurement.

[0037] In addition, when conducting simulation experiments, it is also necessary to design the layout and performance parameters of the virtual coil. These performance parameters include, but are not limited to, the size and shape of the coil, the turn density at each position on the coil, the winding direction of the turns, the inductance coefficient of the coil, etc. By optimizing these parameters, high-sensitivity detection of the current in the area to be measured can be achieved, while effectively shielding the current in the non-measured area and improving the accuracy of detection. The optimization of performance parameters is usually based on specific mathematical models or algorithms, aiming to solve the problems of sensitivity, selectivity, and stability in actual detection.

[0038] For example: if the cross-section of the conductor to be measured is circular, the virtual coil can also be set as circular; if the cross-section of the conductor to be measured is rectangular, the virtual coil can also be set as a rectangular coil. The turn density at each position on the virtual coil, the winding direction of the turns, and other parameters need to be set based on various considerations such as historical detection parameters.

[0039] Among them, at least preset the virtual detection parameters according to the size of the conductor to be measured, including the following steps:

[0040] Step S201: Obtain historical detection parameters. The above historical detection parameters at least include the position of the historical real coil, the turn density at each position on the historical real coil, and the turn direction at each position on the historical real coil. The historical real coil is the coil used to detect the current distribution of the conductor to be measured at a historical moment;

[0041] Step S202: Determine the position of the virtual coil, the virtual turn density at each position on the virtual coil, and the virtual turn direction at each position on the virtual coil according to the size of the conductor to be measured and the above historical detection parameters. Among them, the virtual turn direction at each position on the virtual coil is a positive winding, and the distance between the virtual coil and the conductor to be measured is less than or equal to a preset distance.

[0042] Specifically, using historical detection parameters as a design reference avoids the exploration process from scratch and can determine the configuration of the virtual coil faster. In addition, since the virtual coil design uses a positive winding direction and the distance from the conductor to be measured is controlled within a preset range, this simplifies the coil design and manufacturing process and helps to accelerate the construction and adjustment of the detection system. The distance between the virtual coil and the conductor to be measured is less than or equal to the preset distance, which can ensure that the coil can detect without contacting the conductor and without affecting the normal operation of the conductor, realizing non-invasive measurement of the current distribution.

[0043] First, analyze the historical detection parameters of the conductor under test, that is, the performance parameters of the historical coil used to detect the current of the conductor under test at historical moments (for example: the turn direction and turn density at each position on the coil) and the detection effect of using the historical coil for detection (the sensitivity to the current in the detection area and the shielding ability to the current in the non-detection area, etc.). Through the results and effects of the historical detection parameters, evaluate the performance (such as sensitivity, selectivity, stability) of different detection coils when detecting the current distribution of the conductor under test. Then, combine the specific dimensions of the current conductor under test, and through a mathematical model or simulation tool, predict or calculate the ideal layout and performance parameters of the coil, and preset the virtual detection parameters for this simulation.

[0044] In the optimized virtual coil design, the winding direction of all turns is set to be wound in the positive direction. This setting may be based on considerations of specific detection requirements. For example, the positive winding direction may be more conducive to enhancing the induction of the current signal in the area under test. The preset distance is set based on the electromagnetic characteristics of the conductor and the requirements of detection accuracy to ensure that the coil can effectively sense the magnetic field change of the conductor under test, so as to obtain accurate current distribution information. The optimized design of the virtual coil needs to ensure that its distance from the conductor under test does not exceed this preset value to guarantee the detection effect.

[0045] In some embodiments, review the past detection records and collect all relevant information about the real coils used before, including the specific positions of the coils, the density distribution of the turns, the winding direction, and the feedback of their effects during the detection process (such as detection accuracy, interference level, etc.). Organize the historical data, analyze the influence of different coil configurations on the detection of current distribution, summarize the coil parameter patterns related to the detection effect, and obtain the virtual detection parameters.

[0046] After obtaining the virtual detection parameters, establish a virtual model according to the virtual detection parameters. The virtual detection parameters at least include the virtual position of the current under test, the virtual position of the interfering current, the virtual position of the coil, the virtual turn density at each position on the virtual coil, and the virtual turn direction at each position on the above virtual coil. Figure 2 For the established virtual model, as Figure 2 shown, the virtual model includes a virtual coil, virtual turns, a virtual area under test, and a virtual non-detection area. Among them, the virtual current located in the virtual area under test is the virtual current under test, and the virtual current located in the virtual non-detection area is the virtual interfering current.

[0047] The virtual detection parameters at least include the virtual position of the current under test, the virtual position of the interfering current, the virtual position of the coil, the virtual turn density at each position on the virtual coil, and the virtual turn direction at each position on the above virtual coil.

[0048] Among them, there are multiple current detection coils and multiple virtual coils. The current detection coils and the virtual coils correspond one by one. At least preset virtual detection parameters according to the size of the conductor to be measured, including the following steps:

[0049] Step S301: Determine the positions of the virtual coils according to the number of the current detection coils and the size of the conductor to be measured;

[0050] For example, if the diameter of the conductor to be measured is 20 cm, the first current detection coil can be set at a position 5 cm away from the conductor to be measured, the second current detection coil can be set at a position 5 cm away from the conductor to be measured, and the third current detection coil can be set at a position 15 cm away from the conductor to be measured, etc.

[0051] Step S302: Determine the virtual measured current positions and virtual interference current positions corresponding to the virtual coils according to the number of the current detection coils and the current region to be detected of the conductor to be measured.

[0052] For example, in the case of multiple current detection coils, the current region to be detected of the conductor to be measured can be split into multiple sub-regions to be detected, and each current detection coil respectively detects the current distribution in each sub-region.

[0053] Specifically, by precisely matching the size of the conductor to be measured and the number of current detection coils, the positions of the virtual coils can be optimized to be more reasonable, ensuring that each coil can effectively cover and detect the current region to be detected of the conductor to be measured, thereby improving the recognition accuracy of the local current distribution.

[0054] During the actual test process, there may be multiple current detection coils, and each current detection coil respectively detects the current in different regions of the conductor to be measured, as Figure 3 shown. Therefore, multiple virtual coils also need to be established during the simulation process to simulate the detection of each current detection coil.

[0055] When designing a multi-coil-based detection system, it is first necessary to determine the number of virtual coils and their relative positions with respect to the conductor to be measured. The determination of the number of coils depends on the size and complexity of the conductor to be measured, as well as the expected detection accuracy. For larger conductors or scenarios requiring high-precision detection, more virtual coils may be needed to cover each key region of the conductor to obtain more comprehensive current distribution information.

[0056] The positions of the virtual coils usually need to be evenly or unevenly distributed around the conductor under test to ensure that the current in each region can be effectively detected. When the distribution is uneven, it is necessary to consider the geometric characteristics of the conductor and the expected non-uniformity of the current distribution, and concentrate more coils or coil densities in the regions where the current change may be larger to improve the detection sensitivity in these regions.

[0057] The virtual current position to be measured refers to the specific points or regions preset on the conductor under test where the current change needs to be detected. The selection of these positions should cover all important current distribution regions in the conductor to ensure the comprehensiveness of detection. At the same time, considering the limitation of the number of coils, it is necessary to determine the most effective detection point positions through mathematical methods or simulations.

[0058] The virtual interfering current position refers to the external region of the conductor that may generate interference during the detection process. When designing the virtual coils, it is necessary to estimate the positions of these interference sources and adjust the coil layout and turn density to effectively shield or reduce the influence of interference signals.

[0059] Step S102, based on Faraday's law of electromagnetic induction, determine the true performance parameters of the current detection coil according to the above virtual detection parameters. The true performance parameters of the current detection coil are used to fabricate the current detection coil, and the current detection coil is used to detect the current distribution of the conductor under test.

[0060] Specifically, by controlling the turn density and winding direction of the turns in the printed circuit board current detection coil, the printed circuit board coil has high sensitivity to the current in the detection region and high shielding ability to the current in the non-detection region, realizing non-invasive detection with high recognition ability for local current.

[0061] Among them, the above virtual detection parameters at least include the virtual current position to be measured, the virtual interfering current position, the virtual coil position, the virtual turn density at each position on the virtual coil, and the virtual turn direction at each position on the virtual coil. The above true performance parameters at least include the position of the current detection coil, the true turn density at each position on the current detection coil, and the true turn direction at each position on the current detection coil. Based on Faraday's law of electromagnetic induction, determining the true performance parameters of the current detection coil according to the above virtual detection parameters includes the following steps:

[0062] Step S401, obtain the first mutual inductance matrix and the second mutual inductance matrix based on Faraday's law of electromagnetic induction. The first mutual inductance matrix is the mutual inductance matrix between the virtual current position to be measured and the virtual turns at each position on the virtual coil, and the second mutual inductance matrix is the mutual inductance matrix between the virtual interfering current position and the virtual turns at each position on the virtual coil;

[0063] Among them, obtaining the first mutual inductance matrix and the second mutual inductance matrix based on Faraday's law of electromagnetic induction includes the following steps:

[0064] Step S4011, obtain the mutual inductance formula , where is the mutual inductance between the conductor under test and a single turn, in henries (H), is the magnetic permeability of air, equal to 4π×10 -7 H / m, a is the absolute height of the turn, in meters (m), is the distance between the conductor under test and the outer edge of the virtual coil, in meters (m), is the distance between the conductor under test and the inner edge of the virtual coil, in meters (m);

[0065] Step S4012, according to the above mutual inductance formula, determine the first mutual inductance matrix and the second mutual inductance matrix. Among them, the number of rows of the first mutual inductance matrix is the number of virtual measured current positions, the number of rows of the second mutual inductance matrix is the number of virtual interference current positions, the number of columns of the first mutual inductance matrix and the number of columns of the second mutual inductance matrix are both the number of turns of the virtual coil. The element in the i-th row and j-th column of the first mutual inductance matrix is the mutual inductance between the i-th virtual measured current position and the j-th virtual turn, and the element in the i-th row and j-th column of the second mutual inductance matrix is the mutual inductance between the i-th virtual interference current position and the j-th virtual turn.

[0066] Specifically, the first mutual inductance matrix and the second mutual inductance matrix reflect the relationship between the measured area and the non-measured area and the turns, and are used for subsequent optimization of the turns. The first mutual inductance matrix and the second mutual inductance matrix respectively describe the electromagnetic coupling effect between the current detection coil and the current position in the measured area (the first mutual inductance matrix) and the current position in the non-measured area (the second mutual inductance matrix). Through this matrix, the detection ability of the coil for the current in the conductor and the shielding effect on the current in the non-detection area can be specifically quantified.

[0067] When designing the current detection coil of a printed circuit board, the mutual inductance matrix guides the optimal layout of the turns in the coil. By analyzing the first mutual inductance matrix and the second mutual inductance matrix, it can be determined which coil positions and turn densities can maximize the detection of the current in the conductor under test and minimize the response to the current in the non-detection area, thereby improving the accuracy of local current identification.

[0068] That is, the mutual inductance matrix plays a bridging role in this application. It connects the theory and practice of coil design and conductor current detection. By accurately calculating the mutual inductance relationship between the coil and the conductor, it can guide the optimal design of the coil, achieve high-precision local current identification, simplify the subsequent signal processing process, and provide strong technical support for non-invasive measurement of conductor current distribution.

[0069] Step S402: Establish an optimization function based on the above first mutual inductance matrix and the above second mutual inductance matrix, and solve it with the optimal turn density distribution of the above current detection coil as the target to obtain the above true performance parameters.

[0070] Specifically, the design of the optimization function aims to minimize the interference in the non-detection area while maximizing the signal strength in the detection area. The obtained optimal turn density distribution can ensure that the coil has the highest sensitivity to the detection of the target current, while the response to external interference signals is effectively suppressed. This means that the detection result will be more accurate and can more clearly reflect the true current distribution of the conductor under test. This process allows for the customization of the coil's geometric layout and turn density according to the specific requirements and characteristics of the conductor under test. Different conductors under test may have different current distribution patterns and interference environments. By solving the optimization function, the most suitable coil design for a specific conductor can be obtained, ensuring the pertinence and effectiveness of the detection scheme. The design of the optimal turn density distribution makes the signal output by the detection coil purer at the source, reducing the need for complex steps such as noise removal and current distribution reconstruction in subsequent data processing. This means that the entire detection process will be more efficient, and the interpretation and analysis of the data will also be more straightforward.

[0071] Among them, establishing an optimization function based on the above first mutual inductance matrix and the above second mutual inductance matrix, and solving it with the optimal turn density distribution of the above current detection coil as the target to obtain the above true performance parameters includes the following steps:

[0072] Step S4021: Determine the optimization parameters based on the above first mutual inductance matrix and the above second mutual inductance matrix, and establish an optimization function according to the above optimization parameters. Among them, the above optimization parameters at least include: the sensitivity of the above virtual coil to the current in the measured area of the above conductor under test, the shielding ability of the above coil to the current in the non-measured area of the above conductor under test, and the stability of the detection level of the above virtual coil at each position in the measured area of the above conductor under test;

[0073] Step S4022: Solve with the goal of minimizing the above optimization function to obtain the above true performance parameters.

[0074] Specifically, the design of the optimization function focuses on improving the sensitivity of the virtual coil to the current in the measured area of the conductor under test. This means that by adjusting the physical parameters of the coil (such as turn density and winding direction), the current changes in the measured area can be detected more accurately, thereby improving the sensitivity of the overall detection system, enabling even small current changes to be clearly captured and measured.

[0075] By analyzing the second mutual inductance matrix, the optimization function also takes into account the shielding effect of the coil on the current in the non-measured area. In practical applications, the current in the non-measured area or external electromagnetic interference may affect the detection results. The optimized coil layout and parameter design can effectively reduce these interferences, improve the purity of the detection signal, and ensure the accuracy and reliability of the measurement results.

[0076] The optimization function also focuses on the stability of the detection level of each position in the measured area by the coil. This means that the optimization process takes into account the coverage uniformity and response consistency of the coil over the entire measured area, ensuring that regardless of how the current is distributed in the measured area, the coil can provide stable and consistent detection results, avoiding detection deviations caused by local parameter differences, and improving the overall performance of the detection system.

[0077] By setting up and optimizing the function, customized design can be carried out according to different detection requirements (such as specific current distribution patterns, required sensitivity, and shielding levels, etc.). This means that for various different measured conductors and application scenarios, the current detection coil that best meets the requirements can be designed, improving the applicability and flexibility of the technical solution.

[0078] In addition, the solution of the minimum value of the optimization function is essentially to find a set of parameter configurations that maximize the detection sensitivity of the coil to the current in the measured area, while achieving the optimal shielding ability and detection stability for the current in the non-measured area. This means that the finally obtained coil design can work in the best state and achieve the optimal performance parameters theoretically. By solving the minimum value of the optimization function, the coil parameters most suitable for specific detection requirements can be obtained. Whether it is high sensitivity, strong shielding effect, or uniform detection stability required, the optimization process can accurately match these requirements to ensure that the designed coil can perform just right in practical applications, avoiding over-performance or under-performance.

[0079] Among them, the optimization function is set up according to the above-mentioned first mutual inductance matrix and the above-mentioned second mutual inductance matrix, including: setting up the optimization function according to the above-mentioned first mutual inductance matrix and the above-mentioned second mutual inductance matrix , where is the true turn density at each position on the above-mentioned current detection coil and the true turn direction at each position on the above-mentioned current detection coil, and are the upper and lower limits of the true turn density at each position on the above-mentioned current detection coil respectively, is the above-mentioned first mutual inductance matrix, is the above-mentioned second mutual inductance matrix, n is the number of turns of the above-mentioned virtual coil, m1 is the number of virtual measured current positions, m2 is the number of virtual interference current positions, C 1 is the first weighting coefficient, C 2 is the second weighting coefficient.

[0080] Among them, the first term in the above optimization function represents the sensitivity of the coil to the current in the measured area, the second term represents the shielding ability of the coil to the current in the non-measured area, and the third term represents the stability of the coil's detection level at various positions in the measured area. , where a, b, and c are the true turn densities at various positions on the current detection coil, and the plus and minus signs of a, b, and c are the true turn directions at various positions on the current detection coil. and are determined according to the actual manufacturing ability of the PCB board, such as the shortest distance between through holes on the PCB board. and The meaning of the plus and minus signs is that the upper limit is positive, indicating that the turns are wound forward, and the lower limit is negative, indicating that the turns are wound backward. The "s.t." in the above optimization function represents the constraint condition. In mathematics, "s.t." is an abbreviation of "such that", indicating the given condition or constraint condition. In mathematics, this symbol is usually used to represent the conditions or properties that a certain variable needs to satisfy.

[0081] Among them, in the process of solving the coil optimization, a technology combining the ant colony algorithm and the gradient descent algorithm in artificial intelligence technology is applied. In the process of finding the global optimal solution, the computational workload of traversing and solving is large and the time-consuming is long. Therefore, the ant colony algorithm is used to find the approximate range to be solved, avoiding the heavy computational workload. Then, the gradient descent algorithm is used to solve the optimal solution on the basis of the ant colony algorithm. The combination of the two algorithms not only meets the requirement of fast calculation but also can find the global optimal solution.

[0082] In addition, the material of the above coil can be copper wire. Copper is an excellent conductor, second only to silver in conductivity. This means that a coil made of copper wire can transmit current more effectively and reduce energy loss. In current detection applications, high conductivity helps to improve the sensitivity of the coil and more accurately sense and measure the current change of the measured conductor. And copper has good chemical stability and is not easily oxidized, especially in a conventional working environment. This ensures that the copper coil can maintain its performance during long-term use, reducing the need for maintenance and replacement and extending the service life of the equipment. Moreover, the copper coil performs well in terms of electromagnetic compatibility and can reduce interference with other electronic devices, which is particularly important for current detection in complex electronic systems and can ensure the purity of the detection signal and the accuracy of measurement. In summary, the many advantages of copper wire in making coils make it the preferred material for current detection coils. It can not only improve the accuracy and efficiency of detection but also help to reduce costs, improve stability and durability, and ensure electromagnetic compatibility and environmental friendliness. These factors work together to make copper wire coils have a wide range of application prospects in the field of current detection.

[0083] In some other embodiments, the material of the above-mentioned coil can also be nanomaterials such as graphene. Using these materials to make the coil can significantly improve the performance of the coil, such as response speed, sensitivity and stability. Utilizing the high conductivity and low resistance characteristics of graphene, a highly sensitive current detection coil is designed to reduce signal attenuation and improve detection accuracy.

[0084] Among them, to achieve the part where the calculated result of the turn density is negative, a method of changing the turn winding direction is also designed. For example, Figure 4 As shown, by different bending directions of the wire routing, different winding directions of the turns are achieved, which respectively represent the positive and negative parts of the turn density.

[0085] Specifically, the mutual inductance matrix allows the adjustment of the coil parameters (such as turn density and winding direction) according to specific conductors under test and usage scenarios to meet different measurement requirements. By introducing the weighting coefficients of C 1 and C 2 in the optimization function, the mutual inductance matrix helps to achieve the customization of the coil performance. For example, in some cases, high sensitivity is given priority, while in other cases, shielding ability is more emphasized. By adjusting the turn density and winding direction, the optimization of the second mutual inductance matrix (describing the mutual inductance relationship between the non-detection area and the coil) can significantly improve the anti-interference ability of the detection system. Even in a strong interference environment, the detection coil can maintain a high signal recognition ability to ensure the reliability of the detection results.

[0086] For the usage scenario of integrated gate-commutated thyristor current distribution detection in the above-mentioned embodiments, based on the expected sensitivity level of the designed coil, the optimal distribution of the turn density is obtained, and the computer is used to calculate the positions of each turn to obtain the specific positions of each turn on the printed circuit board. As Figure 3 shown, there may be multiple current detection coils, that is, including Figure 3 coil 1, coil 2, coil 3 and coil 4 in

[0087] The method for determining the parameters of the current detection coil in the present application first presets virtual detection parameters at least according to the size of the conductor to be measured, where the virtual detection parameters at least include virtual model parameters and performance parameters of the virtual coil; then, based on Faraday's law of electromagnetic induction, the true performance parameters of the current detection coil are determined according to the virtual detection parameters. The true performance parameters of the current detection coil are used to fabricate the current detection coil, and the current detection coil is used to detect the current distribution of the conductor to be measured. The current detection coil fabricated by using the performance parameters obtained by this method has high sensitivity to the current in the detection area and high shielding ability to the current in the non-detection area, realizing non-invasive detection with high recognition ability for local current. Moreover, this method can customize the required performance of the coil according to different usage scenarios, has a wide range of applications, and solves the problem in the prior art that the magnetic field detection device of the conductor has fewer measurement points, resulting in poor current recognition ability between the detection area and the non-detection area.

[0088] The embodiment of the present application also provides a method for detecting the current distribution of a conductor, as Figure 5 shown, including:

[0089] Step S501, using a current detection coil to detect the current at each measured current position of the conductor to be measured, and the performance parameters of the current detection coil are determined by using any one of the methods for determining the parameters of the current detection coil described above.

[0090] Specifically, using the current detection coil determined by the method for determining the parameters of the current detection coil to detect the current distribution of the conductor can significantly improve the accuracy, adaptability, efficiency, and reliability of the detection, simplify the measurement process, enhance the sensitivity and anti-interference ability of the detection, realize the improvement of detection stability, and support customized design and cost control, thereby improving the overall level and application value of the non-invasive conductor current distribution measurement technology.

[0091] Among them, using a current detection coil to detect the current at each measured current position of the conductor to be measured includes the following steps:

[0092] Step S5011, using the current detection coil to collect a coil differential signal proportional to the current change rate;

[0093] Step S5012, sequentially performing voltage follower processing, proportional amplification processing, passive integration processing, and active integration processing on the coil differential signal to obtain a voltage signal proportional to the current amplitude;

[0094] Step S5013, determining the current at each measured current position of the conductor to be measured according to the voltage signal.

[0095] The above steps design an integrator link, as Figure 6As shown, the coil differential signal collected by the coil, which is proportional to the current change rate, is converted into a voltage signal proportional to the current amplitude. It is divided into a voltage follower stage, a proportional amplification stage, a passive integration stage, and an active integration stage. The cooperation between the coil and the integrator realizes the implementation monitoring of the current.

[0096] Specifically, traditional detection methods require complex post-processing of the collected signals, such as current reconstruction algorithms. However, by optimizing the coil layout using the mutual inductance matrix at the design stage, the measurement results of the method of this application can be directly used without complex post-processing, significantly reducing the workload of data analysis. This technical process realizes the efficient conversion from the coil differential signal to the current amplitude voltage signal by optimizing the signal processing process, simplifies the data processing flow, and improves the directness and accuracy of the measurement results. At the same time, the real-time monitoring ability and wide adaptability enable it to play an important role in various current detection scenarios, and it is a key technical means to improve the accuracy and efficiency of non-invasive conductor current distribution measurement.

[0097] In traditional technologies, the signals output by magnetic field detection chips usually need to go through complex mathematical algorithms, such as current reconstruction algorithms, to recover the current amplitudes at various positions of the conductor from the information of the spatial magnetic field amplitude. And the above steps achieve the same effect as the current reconstruction algorithm by optimizing the turn density, simplify the entire process from signal acquisition to result output, avoid the complex post-processing stage, and improve the real-time performance of the measurement and the efficiency of data processing.

[0098] Compared with the need to perform current reconstruction through complex mathematical models and algorithms in the prior art, the above steps directly output a voltage signal proportional to the current amplitude through front-end signal processing, simplifying the data analysis process. This means that users can directly read the current information from the voltage signal, reducing the dependence on professional data analysts and also reducing the analysis time and cost.

[0099] First, the voltage follower is used to buffer and isolate the differential signal output by the coil, preventing the signal from being interfered with or attenuated in the post-processing stage and ensuring the integrity of the signal. The weak coil differential signal is amplified to a more easily processed level for subsequent circuit processing, while ensuring that the linear relationship of the signal is not damaged and guaranteeing the accuracy of the measurement results. Through integral processing, the differential signal output by the coil, which is proportional to the current change rate, is converted into a voltage signal proportional to the current amplitude. The passive integrator is usually composed of a capacitor and a resistor, which is simple and low-cost, but may be limited by the frequency response. The active integrator uses active devices such as operational amplifiers to provide a more stable integration effect, especially in the case of low frequencies or long integration time requirements. The key to this process is to eliminate the transient changes of the signal and extract the steady-state information of the current.

[0100] The design of the entire signal processing flow ensures that the integrity of the signal is maintained during the conversion from the coil differential signal to the current amplitude voltage signal, and noise and interference are effectively suppressed. The finally obtained voltage signal directly reflects the magnitude of the current at each measured current position of the conductor to be measured, without the need for complex current reconstruction algorithms, simplifying the data processing flow and improving the measurement efficiency. The accuracy of the measurement results benefits from the optimization of each link in the signal processing. From voltage following to integration processing, each step ensures the accurate conversion of the signal, reducing measurement errors and enabling the obtained current distribution data to more truly reflect the current state of the conductor to be measured.

[0101] The above embodiments use mathematical methods to solve the turn density distribution and turn winding direction of a coil with high local current recognition ability; by introducing the weighting functions C 1 、C 2 into the optimization function, the effect of customized design for various measurement requirements is achieved; by utilizing the characteristics of printed circuit boards that can arbitrarily adjust the trace density and trace direction, the arbitrary adjustment of the turn density and turn direction is realized. Compared with traditional methods, the above embodiments have higher local current recognition ability; the measurement output results do not require a post-current reconstruction process, saving workload; the required performance of the coil can be customized according to different usage scenarios, with a wide range of applications.

[0102] The embodiments of the present application also provide a device for determining the parameters of a current detection coil. It should be noted that the device for determining the parameters of the current detection coil in the embodiments of the present application can be used to execute the method for determining the parameters of the current detection coil provided in the embodiments of the present application. The device is used to implement the above embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0103] The above device for determining the parameters of the current detection coil includes a processor and a memory, and the corresponding functions are implemented by the processor executing the above program units stored in the memory. The above modules are all located in the same processor; alternatively, the above modules are respectively located in different processors in any combination form.

[0104] The processor contains a kernel, and the kernel retrieves the corresponding program units from the memory. One or more kernels can be set, and by adjusting the kernel parameters, the problem that the current recognition ability between the detection area and the non-detection area is poor due to fewer measurement points in the magnetic field detection device of the conductor in the prior art is solved.

[0105] The memory may include non-permanent memory in the form of computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0106] An embodiment of the present invention provides a computer-readable storage medium, and the computer-readable storage medium includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute the method for determining the parameters of the current detection coil.

[0107] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein when the program runs, it executes the method for determining the parameters of the current detection coil.

[0108] An embodiment of the present invention provides a device, which includes a processor, a memory, and a program stored on the memory and executable on the processor. When the processor executes the program, it implements at least the steps of the method for determining the parameters of the current detection coil. The device herein may be a server, a PC, a PAD, a mobile phone, etc.

[0109] This application also provides a computer program product, which is adapted to execute a program initialized with at least the steps of the method for determining the parameters of the current detection coil when executed on a data processing device.

[0110] Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed on a network composed of multiple computing devices. They can be implemented by program codes executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described herein can be executed in a different order, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module to implement. In this way, the present invention is not limited to any specific combination of hardware and software.

[0111] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application 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 codes.

[0112] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, as well as the combination of flows and / or blocks in the flowchart and / or block diagram. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0113] 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 generate a manufactured article including an instruction means that implements the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0114] 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 generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0115] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0116] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer-readable media.

[0117] A computer-readable medium includes permanent and non-permanent, removable and non-removable media that can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. As defined herein, a computer-readable medium does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0118] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0119] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0120] 1). In the above method for determining the parameters of the current detection coil of the present application, first, at least virtual detection parameters are preset according to the size of the conductor to be measured, where the virtual detection parameters at least include virtual model parameters and performance parameters of the virtual coil; then, based on Faraday's law of electromagnetic induction, the actual performance parameters of the current detection coil are determined according to the virtual detection parameters, and the actual performance parameters of the current detection coil are used to fabricate the current detection coil, and the current detection coil is used to detect the current distribution of the conductor to be measured. The current detection coil fabricated with the performance parameters obtained by this method has high sensitivity to the current in the detection area and high shielding ability to the current in the non-detection area, realizing non-invasive detection with high recognition ability for local current. And this method can customize the required performance of the coil according to different usage scenarios, has a wide range of applications, and solves the problem in the prior art that the magnetic field detection device of the conductor has fewer measurement points, resulting in poor current recognition ability between the detection area and the non-detection area.

[0121] 2), The detection method of the conductor current distribution in this application solves the turn density distribution and turn winding direction of the coil with high local current recognition ability by using mathematical methods; by introducing the weighting functions C 1 , C 2 into the optimization function, the effect of customized design for various measurement requirements is achieved; by utilizing the characteristics that the trace density and trace direction of the printed circuit board can be adjusted arbitrarily, the arbitrary adjustment of the turn density and turn direction is realized. Compared with the traditional method, the local current recognition ability of the above embodiments is higher; the measurement output result does not require the post-current reconstruction processing process, saving workload; the required performance of the coil can be customized according to different usage scenarios, and it has a wide range of applications.

[0122] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A method for determining parameters of a current detection coil, characterized in that: include: Presetting virtual detection parameters at least according to the size of the conductor to be measured, wherein the virtual detection parameters at least include virtual model parameters and performance parameters of the virtual coil, and the virtual detection parameters at least include virtual measured current position, virtual interference current position, virtual coil position, virtual turn density at each position on the virtual coil, and virtual turn direction at each position on the virtual coil; Based on Faraday's law of electromagnetic induction, a first mutual inductance matrix and a second mutual inductance matrix are obtained, wherein the first mutual inductance matrix is ​​a mutual inductance matrix between the virtual measured current position and the virtual turns at various positions on the virtual coil, and the second mutual inductance matrix is ​​a mutual inductance matrix between the virtual interference current position and the virtual turns at various positions on the virtual coil; Determine optimization parameters according to the first mutual inductance matrix and the second mutual inductance matrix, and establish an optimization function according to the optimization parameters, wherein the optimization parameters at least include: the sensitivity of the virtual coil to the current in the measured area of ​​the measured conductor, the shielding ability of the coil to the current in the non-measured area of ​​the measured conductor, and the stability of the detection level of the virtual coil at each position of the measured area of ​​the measured conductor; The optimization function is solved with the minimum value as the goal to obtain the real performance parameters of the current detection coil, and the real performance parameters of the current detection coil are used to prepare the current detection coil, and the current detection coil is used to detect the current distribution of the conductor under test. The real performance parameters at least include the position of the current detection coil, the real wire turn density at each position on the current detection coil, and the real wire turn direction at each position on the current detection coil.

2. The determination method according to claim 1, characterized in that: Based on Faraday's law of electromagnetic induction, the first mutual inductance matrix and the second mutual inductance matrix are obtained, including: Get the Mutual Inductance Formula ,in, is the mutual inductance between the conductor under test and a single turn, is the magnetic permeability of air, a is the absolute height of the wire turn, is the distance between the conductor under test and the outer edge of the virtual coil, is the distance between the conductor under test and the inner edge of the virtual coil; According to the mutual inductance formula, the first mutual inductance matrix and the second mutual inductance matrix are determined, wherein the number of rows of the first mutual inductance matrix is ​​the number of the virtual measured current positions, the number of rows of the second mutual inductance matrix is ​​the number of the virtual interference current positions, the number of columns of the first mutual inductance matrix and the number of columns of the second mutual inductance matrix are both the number of turns of the virtual coil, the element of the i-th row and j-th column in the first mutual inductance matrix is ​​the mutual inductance between the i-th virtual measured current position and the j-th virtual turn, and the element of the i-th row and j-th column in the second mutual inductance matrix is ​​the mutual inductance between the i-th virtual interference current position and the j-th virtual turn.

3. The determination method according to claim 1, characterized in that: Establishing an optimization function according to the first mutual inductance matrix and the second mutual inductance matrix includes: An optimization function is established according to the first mutual inductance matrix and the second mutual inductance matrix ,in, is the actual wire turn density at each position on the current detection coil and the actual wire turn direction at each position on the current detection coil, and are the upper and lower limits of the actual turn density at each position on the current detection coil, respectively. is the first mutual inductance matrix, is the second mutual inductance matrix, n is the number of turns of the virtual coil, m1 is the number of the virtual measured current positions, m2 is the number of the virtual interference current positions, C1 is the first weighting coefficient, and C2 is the second weighting coefficient.

4. The determination method according to claim 1, characterized in that: There are multiple current detection coils, there are multiple virtual coils, the current detection coils correspond to the virtual coils one by one, and the virtual detection parameters are preset at least according to the size of the conductor to be measured, including: The position of each virtual coil is determined according to the number of the current detection coils and the size of the conductor under test; the virtual measured current position and the virtual interference current position corresponding to each virtual coil are determined according to the number of the current detection coils and the current area to be detected of the conductor under test.

5. The determination method according to claim 1, characterized in that: The virtual detection parameters are preset at least according to the size of the conductor to be tested, including: Acquire historical detection parameters, wherein the historical detection parameters at least include the position of a historical real coil, the density of wire turns at each position on the historical real coil, and the direction of wire turns at each position on the historical real coil, wherein the historical real coil is a coil used to detect the current distribution of the conductor under test at a historical moment; According to the size of the conductor under test and the historical detection parameters, the position of the virtual coil, the density of virtual turns at each position on the virtual coil, and the direction of the virtual turns at each position on the virtual coil are determined, wherein the direction of the virtual turns at each position on the virtual coil is positive winding, and the distance between the virtual coil and the conductor under test is less than or equal to a preset distance.

6. The determination method according to any one of claims 1 to 5, characterized in that: The method for determining the parameters of the current detection coil is run in a simulation system.

7. A method for detecting conductor current distribution, characterized in that: include: The current at each current position of the conductor under test is detected by using a current detection coil, and the performance parameter of the current detection coil is determined by using the determination method described in any one of claims 1 to 6.

8. The detection method according to claim 7, characterized in that: The current detection coil is used to detect the current at each current position of the measured conductor, including: The current detection coil is used to collect a coil differential signal proportional to the current change rate; The coil differential signal is sequentially subjected to voltage following processing, proportional amplification processing, passive integration processing, and active integration processing to obtain a voltage signal proportional to the current amplitude; The current at each measured current position of the measured conductor is determined according to the voltage signal.

Images