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

Abstract

The invention provides a current detection coil parameter determination method and a conductor current distribution detection method, and the method comprises the steps: presetting virtual detection parameters at least according to the size of a detected conductor, and the virtual detection parameters at least comprise virtual model parameters and performance parameters of a virtual coil; on the basis of the Faraday's law of electromagnetic induction, real performance parameters of the current detection coil are determined according to the virtual detection parameters, the real performance parameters of the current detection coil are used for preparing the current detection coil, and the current detection coil is used for detecting current distribution of the detected conductor. The current detection coil prepared by adopting the performance parameters obtained by the method has high sensitivity to current in a detection area and has high shielding capability to current in a non-detection area, and non-intrusive detection with high identification capability to local current is realized. And the method can design the performance required by the coil in a customized manner according to different use scenes, and has a wide use range.

Description

Technical Field

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

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

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

[0004] The existing method usually arranges several magnetic field detection devices outside, detects the magnetic field amplitude at several points around the conductor, and uses the current reconstruction algorithm to invert the current distribution of the conductor. However, the magnetic field detector array of the existing method has fewer measurement points, resulting in poor current identification 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 current detection coil parameters and a method for detecting conductor current distribution, so as to at least solve the problem in the prior art that the magnetic field detection device for the conductor has fewer measurement points, resulting in poor current identification ability between the detection area and the non-detection area.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for determining parameters of a current detection coil is provided, comprising: 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; determining real performance parameters of the current detection coil according to the virtual detection parameters based on Faraday's law of electromagnetic induction, 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 include at least a virtual measured current position, a virtual interference current position, a virtual coil position, a virtual wire turn density at each position on the virtual coil, and a virtual wire turn direction at each position on the virtual coil, and the real performance parameters include at least 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. 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 being the mutual inductance matrix of the virtual measured current position and the virtual wire turns at each position on the virtual coil, and the second mutual inductance matrix being the mutual inductance matrix of the virtual interference current position and the virtual wire turns at each position on the virtual coil; establishing an optimization function based on the first mutual inductance matrix and the second mutual inductance matrix, and solving it with the optimal wire turn density distribution of the current detection coil as the target to obtain the real performance parameters.

[0008] Optionally, obtaining the first mutual inductance matrix and the second mutual inductance matrix based on Faraday's law of electromagnetic induction includes: obtaining 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 measured conductor 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.

[0009] Optionally, an optimization function is established according to the first mutual inductance matrix and the second mutual inductance matrix, and is solved with the optimal turn density distribution of the current detection coil as the goal to obtain the real performance parameters, including: determining optimization parameters according to the first mutual inductance matrix and the second mutual inductance matrix, and establishing an optimization function according to the optimization parameters, wherein the optimization parameters include at least: the sensitivity of the virtual coil to the current in the measured area of ​​the measured conductor, the shielding ability of the coil for 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; and solving with the minimum value of the optimization function as the goal to obtain the real performance parameters.

[0010] Optionally, establishing an optimization function according to the first mutual inductance matrix and the second mutual inductance matrix includes: establishing an optimization function 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.

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

[0012] Optionally, virtual detection parameters are preset at least according to the size of the conductor to be measured, including: obtaining historical detection parameters, the historical detection parameters at least including 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, the historical real coil being a coil used to detect the current distribution of the conductor to be measured at a historical moment; determining the position of the virtual coil, the density of virtual wire turns at each position on the virtual coil, and the direction of virtual wire turns at each position on the virtual coil according to the size of the conductor to be measured and the historical detection parameters, wherein the direction of virtual wire turns 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 the preset distance.

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

[0014] According to another aspect of the present application, a method for detecting conductor current distribution is provided, comprising: using a current detection coil to detect the current at each current position of the measured conductor, 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, a current detection coil is used to detect the current at each measured current position of the measured conductor, including: using the current detection coil to collect a coil differential signal proportional to the current change rate; subjecting the coil differential signal to voltage following processing, proportional amplification processing, passive integration processing, and active integration processing in sequence to obtain a voltage signal proportional to the current amplitude; and determining the current at each measured current position of the measured conductor based on the voltage signal.

[0016] Applying the technical solution of the present application, the method for determining the parameters of the current detection coil mentioned above first presets 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; then, based on Faraday's law of electromagnetic induction and the virtual detection parameters, the real performance parameters of the current detection coil are determined, and the real performance parameters of the current detection coil are used to prepare the current detection coil, which is used to detect the current distribution of the conductor to be measured. The current detection coil prepared by the performance parameters obtained by this method has high sensitivity to the current in the detection area and high shielding ability for the current in the non-detection area, realizing non-invasive detection with high recognition ability for local current. And this method can customize the performance required by the coil according to different usage scenarios, has a wide range of uses, and solves the problem that the magnetic field detection device of the conductor in the prior art has fewer measurement points, resulting in poor current recognition ability between the detection area and the non-detection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 A schematic flow chart of a method for determining parameters of a current detection coil provided according to an embodiment of the present application is shown;

[0019] Figure 2 A schematic diagram of the structure of a virtual model provided according to an embodiment of the present application is shown;

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

[0021] Figure 4 A schematic diagram showing different winding directions of a wire turn provided according to an embodiment of the present application is shown;

[0022] Figure 5 A schematic flow chart of a method for detecting conductor current distribution provided according to an embodiment of the present application is shown;

[0023] Figure 6 A schematic flow chart of various links of an integrator for signal conversion provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] As introduced in the background technology, in the prior art, when measuring the conductor current, it is necessary to arrange current detectors such as Rogowski coils around the conductor to be measured. In the field of current distribution research of some conductors, there is often no space around the conductor to be measured for arranging current detectors, and the current distribution of the conductor is difficult to obtain. The chip current distribution of power electronic devices such as integrated gate commutated thyristors (IGCTs) is affected by many 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, the internal space is small, and it is difficult to arrange detection equipment. Therefore, it is necessary to arrange current detection devices non-invasively outside the device to evaluate the current distribution of semiconductor chips. The three-phase cable for power transmission contains three conductors for conducting phase current. There is a need to measure the phase current in each conductor in the project. 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 current detectors. Therefore, it is necessary to arrange current detection devices non-invasively outside the three-phase cable to evaluate the phase current size in the three-phase cable.

[0028] The existing method usually arranges several magnetic field detection devices outside, detects the magnetic field amplitude at several points around the conductor, and uses the current reconstruction algorithm to invert the current distribution of the conductor.

[0029] There are two main problems with the existing methods. First, the existing methods have fewer measurement points in the magnetic field detector array, resulting in the current identification ability between the detection area and the non-detection area still needs to be improved. Second, the measurement results of the existing methods cannot be used directly, and need to be post-processed to obtain the current distribution through the current reconstruction algorithm, which increases the workload.

[0030] In order to solve the problem in the prior art that the magnetic field detection device of the conductor has fewer measurement points, resulting in poor current identification ability between the detection area and the non-detection area, the embodiments of the present application provide a method for determining the parameters of the current detection coil and a method for detecting the current distribution of the conductor.

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with 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 running 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 a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

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

[0034] Step S101, 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;

[0035] Specifically, in order to accurately determine the density of wire turns and the direction of wire turns at various positions 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 is run in the simulation system. Through the results of the simulation experiment, the density of wire turns and the direction of wire turns at various positions 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 sensitivity to the current in the detection area and the shielding ability to the current in the non-detection area. For example: 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, which means the detection effect is better.

[0036] When conducting a non-invasive current distribution simulation experiment, it is first necessary to establish a virtual model based on the actual size and geometry of the conductor being measured. This model is used to reproduce the electromagnetic environment inside and around the conductor being measured. The virtual model parameters should at least include the conductor's size, shape, material properties (such as resistivity, magnetic permeability), and estimated current distribution. These parameters are crucial for accurately calculating the mutual inductance matrix between the sensor (such as a coil) and the conductor, which directly affects 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 density of turns at each position on the coil, the winding direction of the turns, the inductance of the coil, etc. By optimizing these parameters, high-sensitivity detection of the current in the measured area can be achieved, while effectively shielding the current in the non-measured area to improve the accuracy of detection. The optimization of performance parameters is usually based on a specific mathematical model or algorithm, aiming to solve the sensitivity, selectivity and stability problems in actual detection.

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

[0039] Wherein, presetting virtual detection parameters at least according to the size of the conductor to be measured comprises the following steps:

[0040] Step S201, obtaining historical detection parameters, the historical detection parameters at least including the position of the 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, the historical real coil is a coil used to detect the current distribution of the conductor under test at a historical moment;

[0041] Step S202, according to the size of the conductor to be measured and the historical detection parameters, determine the position of the virtual coil, the density of virtual turns at each position on the virtual coil, and the direction of virtual turns at each position on the virtual coil, 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 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 more quickly. In addition, since the virtual coil design adopts a positive winding direction and the distance from the conductor under test is controlled within a preset range, this simplifies the design and production process of the coil and helps to speed up the construction and adjustment of the detection system. The distance between the virtual coil and the conductor under test is less than or equal to the preset distance, which can ensure that the coil can be detected without contacting the conductor and affecting the normal operation of the conductor, realizing non-invasive current distribution measurement.

[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 the historical moment (for example, the direction and density of the turns at each position on the coil) and the detection effect of the historical coil (sensitivity to the current in the detection area, and shielding ability for the current in the non-detection area, etc.). Through the results and effects of the historical detection parameters, evaluate the performance of different detection coils in detecting the current distribution of the conductor under test (such as sensitivity, selectivity, and stability). Then, combined with the specific size of the current conductor under test, the ideal layout and performance parameters of the coil are predicted or calculated through mathematical models or simulation tools, and the virtual detection parameters of this simulation are preset.

[0044] In the optimized virtual coil, the winding direction of all turns is set to positive winding. 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 current signals in the measured area. The preset distance is set based on the electromagnetic properties of the conductor and the detection accuracy requirements to ensure that the coil can effectively sense the magnetic field changes of the measured conductor, thereby obtaining accurate current distribution information. The optimized design of the virtual coil must ensure that its distance from the measured conductor does not exceed this preset value to ensure the detection effect.

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

[0046] After obtaining the virtual detection parameters, a virtual model is established according to the virtual detection parameters, and the virtual detection parameters at least include the virtual measured current position, the virtual interference current position, the virtual coil position, the virtual wire turn density at each position on the virtual coil, and the virtual wire turn direction at each position on the above virtual coil. Figure 2 For the virtual model established, Figure 2 As shown, the virtual model includes a virtual coil, a virtual turn, a virtual measured area, and a virtual non-measured area, wherein the virtual current in the virtual measured area is the virtual measured current, and the virtual current in the virtual non-measured area is the virtual interference current.

[0047] The virtual detection parameters at least include a virtual measured current position, a virtual interference current position, a virtual coil position, a virtual turn density at each position on the virtual coil, and a virtual turn direction at each position on the virtual coil.

[0048] There are multiple current detection coils, 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 following steps:

[0049] Step S301, determining the position of each 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 distance of 5 cm from the conductor to be measured, the second current detection coil can be set at a distance of 5 cm from the conductor to be measured, the third current detection coil can be set at a distance of 15 cm from the conductor to be measured, and so on.

[0051] Step S302, determining the virtual measured current position and the virtual interference current position corresponding to each of the virtual coils according to the number of the current detection coils and the current region to be detected of the measured conductor.

[0052] For example, when there are multiple current detection coils, the current region to be detected of the conductor to be detected can be divided into multiple sub-regions to be detected, wherein each current detection coil detects the current distribution in each sub-region respectively.

[0053] Specifically, by accurately matching the size of the conductor under test and the number of current detection coils, the position of the virtual coil can be optimized more reasonably, ensuring that each coil can effectively cover and detect the current area to be detected of the conductor under test, thereby improving the recognition accuracy of local current distribution.

[0054] In the actual test process, there may be multiple current detection coils, each of which detects the current in different areas of the conductor being tested, such as Figure 3 Therefore, it is also necessary to establish multiple virtual coils during the simulation process to simulate the detection of each of the above current detection coils.

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

[0056] The position of the virtual coils usually needs to be evenly or unevenly distributed around the conductor to be measured to ensure that the current in each area can be effectively detected. When the distribution is uneven, it is necessary to consider the geometric characteristics of the conductor and the expected unevenness of the current distribution, and concentrate more coils or coil density in areas where the current variation may be large to improve the detection sensitivity in these areas.

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

[0058] The virtual interference current location refers to the area outside the conductor that may generate interference during the detection process. When designing a virtual coil, it is necessary to estimate the location of these interference sources and adjust the layout and turn density of the coil to effectively shield or reduce the impact of the interference signal.

[0059] Step S102, based on Faraday's law of electromagnetic induction and 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.

[0060] Specifically, by controlling the density of turns and the winding direction of the turns in the printed circuit board current detection coil, the printed circuit board coil is made to have high sensitivity to the current in the detection area and high shielding ability for the current in the non-detection area, thereby achieving non-invasive detection with high recognition ability for local current.

[0061] The virtual detection parameters at least include a virtual measured current position, a virtual interference current position, a virtual coil position, a virtual turn density at each position on the virtual coil, and a virtual turn direction at each position on the virtual coil; the real performance parameters at least include a position of the current detection coil, a real turn density at each position on the current detection coil, and a real turn direction at each position on the current detection coil; and based on Faraday's law of electromagnetic induction and the virtual detection parameters, determining the real performance parameters of the current detection coil comprises the following steps:

[0062] Step S401, obtaining a first mutual inductance matrix and a second mutual inductance matrix based on Faraday's law of electromagnetic induction, 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;

[0063] Wherein, 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, obtaining the mutual inductance formula ,in, is the mutual inductance between the conductor under test and a single wire turn, in Henry (H), is the magnetic permeability of air, equal to 4π×10 -7 H / m, a is the absolute height of the wire 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 mutual inductance formula, determine the first mutual inductance matrix and the second mutual inductance matrix, 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.

[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, which 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 (first mutual inductance matrix) and the current position in the non-measured area (second mutual inductance matrix). Through this matrix, the coil's ability to detect current in the conductor and its shielding effect on the current in the non-detection area can be specifically quantified.

[0067] When designing a printed circuit board current detection coil, 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 is possible to determine which coil positions and turn densities can maximize the detection of the current in the conductor being measured while minimizing 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, connecting 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 and achieve high-precision local current identification. At the same time, it simplifies the post-processing process of the signal and provides strong technical support for non-invasive conductor current distribution measurement.

[0069] Step S402: establishing an optimization function according to the first mutual inductance matrix and the second mutual inductance matrix, and solving the optimal turn density distribution of the current detection coil as a target to obtain the actual performance parameters.

[0070] Specifically, the optimization function is designed to minimize interference in the non-detection area while maximizing the signal strength in the detection area. The optimal turn density distribution obtained by solving 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 results will be more accurate and can more clearly reflect the true current distribution of the conductor under test. This process allows the geometric layout and turn density of the coil to be customized according to the specific needs 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 coil design that best suits the specific conductor can be obtained to ensure 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 reconstruction of current distribution in subsequent data processing. This means that the entire detection process will be more efficient and the interpretation and analysis of data will be more direct.

[0071] The 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 target to solve the above-mentioned real performance parameters, including the following steps:

[0072] Step S4021, determining optimization parameters according to the first mutual inductance matrix and the second mutual inductance matrix, and establishing 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;

[0073] Step S4022, solving the optimization function with the minimum value as the goal to obtain the actual 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 measured conductor. This means that by adjusting the physical parameters of the coil (such as the density of turns and the winding direction), the current changes in the measured area can be detected more accurately, thereby improving the sensitivity of the overall detection system, so that even tiny current changes can be clearly captured and measured.

[0075] By analyzing the second mutual inductance matrix, the optimization function also considers 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 the 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 coil's detection level at each position in the measured area. This means that the optimization process takes into account the uniformity of the coil's coverage and response consistency in the entire measured area, ensuring that no matter 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 functions, customized designs can be made according to different detection requirements (such as specific current distribution patterns, required sensitivity and shielding levels, etc.). This means that for various different conductors to be tested and application scenarios, the current detection coil that best meets the requirements can be designed, which improves the applicability and flexibility of the technical solution.

[0078] In addition, solving the minimum value of the optimization function is essentially looking for a set of parameter configurations that maximizes the coil's detection sensitivity to the current in the measured area, while optimizing the shielding capability and detection stability for the current in the non-measured area. This means that the final coil design can work in the best state and achieve the theoretically optimal performance parameters. By solving the minimum value of the optimization function, the coil parameters that best suit specific detection requirements can be obtained. Whether high sensitivity, strong shielding effect or uniform detection stability is required, the optimization process can accurately match these requirements to ensure that the designed coil can perform just right in actual applications and avoid excess or insufficient performance.

[0079] Wherein, establishing an optimization function according to the first mutual inductance matrix and the second mutual inductance matrix includes: establishing an optimization function 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 mentioned above, 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, C1 is the first weighting coefficient, and C2 is the second weighting coefficient.

[0080] Among them, the first item in the above optimization function represents the sensitivity of the coil to the current in the measured area, the second item represents the shielding ability of the coil to the current in the non-measured area, and the third item represents the stability of the coil's detection level at each position in the measured area. , a, b, c are the actual wire turn densities at each position on the current detection coil, and the positive and negative signs of a, b, c are the actual wire turn directions at each position on the current detection coil. and It is determined based on the actual manufacturing capabilities of the PCB board, such as the shortest distance between through holes on the PCB board. and The meaning of the positive and negative signs is that the upper limit is a positive number, indicating that the wire turns are wound forward, and the lower limit is a negative number, indicating that the wire turns are wound backward. The st in the above optimization function represents the restriction condition. In mathematics, "st" is the abbreviation of "such that", which means a given condition or restriction condition. In mathematics, this symbol is often used to represent the conditions or properties that a variable needs to meet.

[0081] Among them, in the process of solving coil optimization, the combination of ant colony algorithm and gradient descent algorithm in artificial intelligence technology is applied. In the process of finding the global optimal solution, the traversal solution requires a large amount of calculation and takes a long time. Therefore, the ant colony algorithm is used to find the approximate range to be solved, avoiding heavy calculations. Then, the gradient descent algorithm is used to solve the optimal solution based on the ant colony algorithm. The combination of the two algorithms not only meets the needs of fast calculation, but also finds the global optimal solution.

[0082] In addition, the material of the coil can be copper wire. Copper is an excellent conductor, and its conductivity is second only to silver. This means that coils made of copper wire can transmit current more efficiently 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 changes of the conductor being measured. And copper has good chemical stability and is not easily oxidized, especially in a regular working environment. This ensures that the copper coil can maintain its performance in 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 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 the 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 reduce costs, improve stability and durability, and ensure electromagnetic compatibility and environmental friendliness. These factors work together to make copper wire coils have broad application prospects in the field of current detection.

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

[0084] In order to realize the negative density of the wire turn density calculation result, a method of changing the winding direction of the wire turns is also designed. Figure 4 As shown, different winding directions of the turns are achieved by bending the wires in different directions, which respectively represent the positive and negative parts of the turn density.

[0085] Specifically, the mutual inductance matrix allows the parameters of the coil (such as turn density and winding direction) to be adjusted according to the specific conductor being measured and the usage scenario to meet different measurement requirements. By introducing the C1 and C2 weighting coefficients in the optimization function, the mutual inductance matrix helps to customize the performance of the coil, such as giving priority to high sensitivity in some cases and focusing more on shielding capabilities in other cases. By adjusting the turn density and winding direction, the optimization of the second mutual inductance matrix (describing the relationship between the non-detection area and the mutual inductance of 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 capability to ensure the reliability of the detection results.

[0086] The above embodiment aims at the use scenario of current distribution detection of integrated gate-commutated thyristors, obtains the optimal distribution of turn density based on the expected sensitivity level of the designed coil, and uses a computer to calculate the position of each turn to obtain the specific position of each turn on the printed circuit board. Figure 3 As shown, there may be multiple current detection coils, including Figure 3 In the coil 1, coil 2, coil 3 and coil 4, the monitoring areas corresponding to the four current detection coils are monitoring area 1, monitoring area 2, monitoring area 3 and monitoring area 4 respectively.

[0087] The method for determining the parameters of the above-mentioned current detection coil of the present application first presets 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; then, based on Faraday's law of electromagnetic induction and the virtual detection parameters, the real performance parameters of the current detection coil are determined, 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 to be measured. The current detection coil prepared by the performance parameters obtained by this method has high sensitivity to the current in the detection area and high shielding ability for the current in the non-detection area, realizing non-invasive detection with high recognition ability for local current. And this method can customize the performance required by the coil according to different usage scenarios, has a wide range of use, and solves the problem that the magnetic field detection device of the conductor in the prior art has fewer measurement points, resulting in poor current recognition ability between the detection area and the non-detection area.

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

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

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

[0091] The current detection coil is used to detect the current at each current position of the conductor under test, and the following steps are included:

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

[0093] Step S5012, the coil differential signal is subjected to voltage following processing, proportional amplification processing, passive integration processing, and active integration processing in sequence to obtain a voltage signal proportional to the current amplitude;

[0094] Step S5013: determining the current at each current position under test of the conductor under test according to the voltage signal.

[0095] The above steps design the integrator link, such as Figure 6As shown in the figure, the coil differential signal proportional to the current change rate collected by the coil is converted into a voltage signal proportional to the current amplitude. It is divided into a voltage follower link, a proportional amplification link, a passive integral link, and an active integral link. The coil and the integrator cooperate to realize the 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 in the design stage, the measurement results of the method of the present application can be used directly without complex post-processing, significantly reducing the workload of data analysis. This technical process achieves efficient conversion from coil differential signals to current amplitude and voltage signals by optimizing the signal processing process, simplifies the data processing process, and improves the directness and accuracy of the measurement results. At the same time, the real-time monitoring capability and wide adaptability enable it to play an important role in a variety of 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 technology, the signal output by the magnetic field detection chip usually needs to go through complex mathematical algorithms, such as the current reconstruction algorithm, to recover the current amplitude at each position of the conductor from the information of the spatial magnetic field amplitude. The above steps achieve the same effect as the current reconstruction algorithm by optimizing the turn density, simplifying the entire process from signal acquisition to result output, avoiding complex post-processing stages, and improving the real-time measurement and data processing efficiency.

[0098] Compared with the existing technology that requires complex mathematical models and algorithms to reconstruct current, 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 current information from the voltage signal, reducing dependence on professional data analysts, and also reducing analysis time and cost.

[0099] First, the voltage follower is used to buffer and isolate the differential signal output by the coil to prevent the signal from being interfered with or attenuated in the post-processing stage and ensure the integrity of the signal. The weak coil differential signal is amplified to a more processable level to facilitate subsequent circuit processing, while ensuring that the linear relationship of the signal is not destroyed and the accuracy of the measurement results is guaranteed. Through integration processing, the differential signal output by the coil, which is proportional to the rate of change of the current, is converted into a voltage signal proportional to the current amplitude. Passive integrators are usually composed of capacitors and resistors, which are simple and low-cost, but may be limited by frequency response. Active integrators use active devices such as operational amplifiers to provide a more stable integration effect, especially at low frequencies or long integration time requirements. The key to this process is to eliminate transient changes in the signal and extract the steady-state information of the current.

[0100] The design of the entire signal processing process ensures that the integrity of the signal is maintained and noise and interference are effectively suppressed during the conversion process from the coil differential signal to the current amplitude voltage signal. The final voltage signal directly reflects the current size of each measured current position of the measured conductor, without the need for complex current reconstruction algorithm processing, which simplifies the data processing process and improves measurement efficiency. The accuracy of the measurement results is due to the optimization of each link of the signal processing. From voltage tracking to integral processing, each step ensures the accurate conversion of the signal, reduces measurement errors, and enables the acquired current distribution data to more truly reflect the current state of the measured conductor.

[0101] The above embodiment uses mathematical methods to solve the turn density distribution and turn winding direction of the coil with high local current identification ability; by introducing weighted functions C1 and C2 into the optimization function, the effect of customized design for various measurement needs is achieved; the characteristics of the printed circuit board that can arbitrarily adjust the routing density and routing direction are used to achieve arbitrary adjustment of the turn density and turn direction. Compared with the traditional method, the local current identification ability of the above embodiment is higher; the measurement output result does not require the post-current reconstruction process, which saves workload; the required performance of the coil can be customized according to different usage scenarios, and it has a wide range of uses.

[0102] The embodiment of the present application also provides a device for determining the parameters of a current detection coil. It should be noted that the device for determining the parameters of a current detection coil in the embodiment of the present application can be used to execute the method for determining the parameters of a current detection coil provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0103] The device for determining the parameters of the current detection coil comprises a processor and a memory, and the processor executes the program unit stored in the memory to implement the corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0104] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the problem of poor current identification ability between the detection area and the non-detection area caused by fewer measurement points of the magnetic field detection device of the conductor in the prior art can be solved by adjusting the kernel parameters.

[0105] The memory may include non-permanent memory in a computer-readable medium, 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, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled 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 the method for determining the parameters of the current detection coil is executed when the program is run.

[0108] An embodiment of the present invention provides a device, the device comprising a processor, a memory, and a program stored in the memory and executable on the processor, and the processor implements at least the steps of a method for determining parameters of a current detection coil when executing the program. The device in this article may be a server, a PC, a PAD, a mobile phone, etc.

[0109] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing the program of the method steps of initializing the determination of the parameters of at least a current detection coil.

[0110] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general 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 a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0111] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt 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] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0113] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0114] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

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

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

[0117] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. 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 technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0118] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

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

[0120] 1) The method for determining the parameters of the current detection coil of the present application first presets 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; then, based on Faraday's law of electromagnetic induction and the virtual detection parameters, the real performance parameters of the current detection coil are determined, and the real performance parameters of the current detection coil are used to prepare the current detection coil, which is used to detect the current distribution of the conductor to be measured. The current detection coil prepared by the performance parameters obtained by this method has high sensitivity to the current in the detection area and high shielding ability for the current in the non-detection area, thereby realizing non-invasive detection with high recognition ability for local current. Moreover, this method can customize the performance required by the coil according to different usage scenarios, has a wide range of uses, 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 conductor current distribution detection method of the present application uses mathematical methods to solve the turn density distribution and turn winding direction of the coil with high local current recognition ability; by introducing weighted functions C1 and C2 into the optimization function, the effect of customized design for various measurement needs is achieved; the printed circuit board can arbitrarily adjust the wiring density and wiring direction, and the turn density and turn direction are arbitrarily adjusted. Compared with the traditional method, the local current recognition ability of the above embodiment is higher; the measurement output result does not require the post-current reconstruction process, which saves workload; the required performance of the coil can be customized according to different usage scenarios, and it has a wide range of uses.

[0122] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present 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; Based on Faraday's law of electromagnetic induction and the virtual detection parameters, the real performance parameters of the current detection coil are determined, 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.

2. The method according to claim 1, characterized in that: The virtual detection parameters at least include a virtual measured current position, a virtual interference current position, a virtual coil position, a virtual turn density at each position on the virtual coil, and a virtual turn direction at each position on the virtual coil; the real performance parameters at least include a position of the current detection coil, a real turn density at each position on the current detection coil, and a real turn direction at each position on the current detection coil; and based on Faraday's law of electromagnetic induction, determining the real performance parameters of the current detection coil according to the virtual detection parameters includes: 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; An optimization function is established according to the first mutual inductance matrix and the second mutual inductance matrix, and is solved with the optimal turn density distribution of the current detection coil as a target to obtain the real performance parameters.

3. The method according to claim 2, 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.

4. The method according to claim 2, characterized in that: An optimization function is established according to the first mutual inductance matrix and the second mutual inductance matrix, and an optimal turn density distribution of the current detection coil is used as a target to solve the actual performance parameter, including: 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 goal of taking the minimum value to obtain the actual performance parameter.

5. The method according to claim 2, 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.

6. The 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: Determining the position of each of the virtual coils according to the number of the current detection coils and the size of the conductor to be measured; According to the number of the current detection coils and the current region to be detected of the measured conductor, the virtual measured current position and the virtual interference current position corresponding to each virtual coil are determined.

7. The 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.

8. The method according to any one of claims 1 to 7, characterized in that The method for determining the parameters of the current detection coil is run in a simulation system.

9. A method for detecting conductor current distribution, characterized in that: include: The current at each current position under test of the conductor is detected by using a current detection coil, and the performance parameters of the current detection coil are determined by using the method for determining the parameters of the current detection coil according to any one of claims 1 to 8.

10. The method according to claim 9, 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.

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