Current determination method and device and current sensor

Abstract

The invention discloses a current determination method and device and a current sensor, the method is applied to the current sensor, the current sensor comprises a first current detection module and a second current detection module, the first current detection module comprises a plurality of magnetic induction units, and the plurality of magnetic induction units are distributed at equal intervals around the circumference of a circle center; the second current detection modules are continuously arranged around the circle center, and the method comprises the following steps: obtaining a first current value of a to-be-detected conductor detected by the first current detection module, and obtaining a second current value of the to-be-detected conductor detected by the second current detection modules; according to the first current value and the second current value, whether the center position of the conductor to be measured deviates relative to the circle center is determined; under the condition that the central position of the to-be-measured conductor deviates relative to the circle center, determining the second current value as an actually measured current value of the to-be-measured conductor; and outputting the actually measured current value of the conductor to be measured.

Description

Technical Field

[0001] The present application relates to the technical field of current detection, and more specifically, to a method and device for determining current and a current sensor. Background Art

[0002] Currently, current measurement in a complex magnetic field environment is often performed through a circular array. However, when measuring current through a circular array, the central position of the conductor to be measured needs to be aligned with the center of the circular array to ensure the symmetry of the magnetic field distribution, and then a high-precision current measurement value can be obtained. In practical applications, the central position of the conductor to be measured may deviate due to installation errors, mechanical vibrations, or other factors. At this time, the magnetic field distribution will no longer be symmetric, resulting in uneven magnetic field intensity measured by the circular array, thereby affecting the accuracy of current measurement. Summary of the Invention

[0003] An object of an embodiment of the present application is to provide a new technical solution for determining current, so as to solve the problem of inaccurate current measurement caused by the deviation of the central position of the conductor to be measured from the center of the circular array in the related art, and improve the accuracy of current measurement.

[0004] According to a first aspect of the present application, there is provided a method for determining current, which is applied to a current sensor. The current sensor includes a first current detection module and a second current detection module. The first current detection module includes a plurality of magnetic induction units, and the plurality of magnetic induction units are equidistantly distributed on a circumference around the center of the circle. The second current detection module is continuously arranged around the center of the circle. The method includes:

[0005] Obtaining a first current value of the conductor to be measured detected by the first current detection module, and obtaining a second current value of the conductor to be measured detected by the second current detection module;

[0006] Determining whether the central position of the conductor to be measured deviates relative to the center of the circle according to the first current value and the second current value;

[0007] In the case where the central position of the conductor to be measured deviates relative to the center of the circle, determining the second current value as the measured current value of the conductor to be measured;

[0008] Outputting the measured current value of the conductor to be measured.

[0009] Optionally, the method further includes:

[0010] In the case where the central position of the conductor to be measured does not deviate relative to the center of the circle, obtaining the current frequency type of the conductor to be measured;

[0011] Determine the measured current value of the conductor to be measured according to the current frequency type of the conductor to be measured.

[0012] Optionally, the detection accuracy of the first current detection module for low-frequency current is higher than that of the second current detection module for low-frequency current, and the detection accuracy of the second current detection module for high-frequency current is higher than that of the first current detection module for high-frequency current. The step of determining the measured current value of the conductor to be measured according to the current frequency type of the conductor to be measured includes:

[0013] When the current frequency type of the conductor to be measured is a low-frequency type, determine the first current value as the measured current value of the conductor to be measured;

[0014] When the current frequency type of the conductor to be measured is a high-frequency type, determine the second current value as the measured current value of the conductor to be measured.

[0015] Optionally, the step of obtaining the current frequency type of the conductor to be measured includes:

[0016] Obtain the current time series of the conductor to be measured detected by the target current detection module within a set historical duration; wherein, the target current detection module is one of the first current detection module and the second current detection module, and the current time series reflects the change of the current value detected by the target current detection module over time within the set historical duration;

[0017] Determine the current frequency type of the conductor to be measured according to the current time series of the conductor to be measured.

[0018] Optionally, the step of determining the current frequency type of the conductor to be measured according to the current time series of the conductor to be measured includes:

[0019] Determine the main current frequency of the conductor to be measured according to the current time series of the conductor to be measured;

[0020] When the main current frequency of the conductor to be measured is less than or equal to the frequency threshold, determine that the current frequency type of the conductor to be measured is a low-frequency type;

[0021] When the main current frequency of the conductor to be measured is greater than the frequency threshold, determine that the current frequency type of the conductor to be measured is a high-frequency type.

[0022] Optionally, the step of determining whether the central position of the conductor to be measured deviates from the center of the circle according to the first current value and the second current value includes:

[0023] When the current difference between the first current value and the second current value is greater than or equal to a current difference threshold, it is determined that the central position of the conductor under test deviates from the center of the circle;

[0024] When the current difference between the first current value and the second current value is less than the current difference threshold, it is determined that the central position of the conductor under test does not deviate from the center of the circle.

[0025] Optionally, when the central position of the conductor under test deviates from the center of the circle, the method further includes:

[0026] Outputting a position deviation prompt message.

[0027] Optionally, obtaining the first current value of the conductor under test detected by the first current detection module includes:

[0028] Obtaining the magnetic induction intensity value detected by each magnetic induction unit among the plurality of magnetic induction units;

[0029] According to the magnetic induction intensity value detected by each magnetic induction unit and a preset conversion relationship, determining the first current value of the conductor under test detected by the first current detection module.

[0030] According to a second aspect of the present disclosure, there is provided a current determination device, including a memory and a processor, the memory is used to store executable instructions; the processor is used to operate according to the control of the instructions to execute the method as described in the first aspect.

[0031] According to a third aspect of the present disclosure, there is provided a current sensor, including a first current detection module and a second current detection module, and the current determination device as described in the second aspect, the first current detection module detects a first current value of a conductor under test and sends the first current value to the current determination device, the second current detection module detects a second current value of the conductor under test and sends the second current value to the current determination device.

[0032] One beneficial effect of the present application is that, when the central position of the conductor under test deviates from the center of the circle, taking the second current value measured by the second current detection module as the actual measured current value of the conductor under test can avoid the influence of the deviation of the central position of the conductor under test from the center of the circle on the accuracy of current measurement and improve the accuracy of current detection. Description of the Drawings

[0033] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present application, and together with the description are used to explain the principles of the present application.

[0034] Figure 1 Schematic diagram of the hardware structure of a current sensor according to an embodiment of the present application;

[0035] Figure 2 Schematic flowchart of a current determination method according to an embodiment of the present application;

[0036] Figure 3 Schematic diagram of the distribution of multiple magnetic induction units of a first current detection module according to an example;

[0037] Figure 4 Principle block diagram of a current determination device according to an embodiment of the present application;

[0038] Figure 5 Principle block diagram of a current sensor according to an embodiment of the present application. Detailed implementation manners

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or its use.

[0041] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered as part of the specification.

[0042] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limitations. Thus, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that: Like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] <Hardware configuration>

[0045] Figure 1 Block diagram of the hardware configuration of a current sensor 100 according to an embodiment of the present application.

[0046] As Figure 1 shown, the current sensor 100 includes a first current detection module 1000 and a second current detection module 2000, as well as a current determination device 3000.

[0047] The first current detection module 1000 and the current determination device 3000 are communicatively connected, and the second current detection module 2000 and the current determination device 3000 are communicatively connected.

[0048] The first current detection module 1000 detects the conductor under test to obtain a first current value, and sends the first current value to the current determination device 3000. The second current detection module 2000 detects the conductor under test to obtain a second current value, and sends the second current value to the current determination device 3000.

[0049] The current determination device 3000 is configured to receive the first current value sent by the first current detection module 1000 and the second current value sent by the second current detection module 2000, and determine the measured current value of the conductor under test according to the first current value and the second current value.

[0050] The current determination device 3000 may include a processor 3100, a memory 3200, an interface device 3300, a communication device 3400, a display device 3500, an input device 3600, a speaker 3700, a microphone 3800, and so on.

[0051] The processor 3100 may be a mobile version processor. The memory 3200 includes, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), a non-volatile memory such as a hard disk, and the like. The interface device 3300 includes, for example, a USB interface, a headphone interface, and the like. The communication device 3400 can perform wired or wireless communication, for example. The communication device 3400 may include a short-range communication device, for example, any device that performs short-range wireless communication based on short-range wireless communication protocols such as the Hilink protocol, WiFi (IEEE 802.11 protocol), Mesh, Bluetooth, ZigBee, Thread, Z-Wave, NFC, UWB, LiFi, etc. The communication device 3400 may also include a remote communication device, for example, any device that performs WLAN, GPRS, 2G / 3G / 4G / 5G remote communication. The display device 3500 is, for example, a liquid crystal display screen, a touch display screen, and the like. The input device 3600 may include, for example, a touch screen, a keyboard, and the like. The user can input / output voice information through the speaker 3700 and the microphone 3800.

[0052] In this embodiment, the memory 3200 of the current determination device 3000 is used to store instructions for controlling the processor 3100 to operate to at least execute the current determination method performed by the current determination device 3000 according to any embodiment of the present application. Those skilled in the art can design the instructions according to the solutions disclosed in the present application. How the instructions control the processor to operate is well known in the art and will not be described in detail here.

[0053] Although in Figure 1A plurality of devices of the current determination device 3000 are shown, however, the present application may only relate to some of the devices, for example, the current determination device 3000 only relates to the memory 3200 and the processor 3100.

[0054] <Method embodiment>

[0055] Figure 2 It is a schematic flowchart of a current determination method according to an embodiment of the present application, and this method is applied to a current sensor. The current sensor in the embodiment of the present application includes a first current detection module and a second current detection module. The first current detection module includes a plurality of magnetic induction units, and the plurality of magnetic induction units are equidistantly distributed on the circumference around the center of the circle.

[0056] In this embodiment, the magnetic induction unit may be a uniaxial magnetic field measurement chip.

[0057] The uniaxial magnetic field measurement chip may be a magnetic field measurement chip with one magnetic sensitive axis direction. The magnetic sensitive axis direction may be the magnetic field direction that the uniaxial magnetic field measurement chip can most sensitively detect.

[0058] The uniaxial magnetic field measurement chip may be a Hall sensor, or other sensors with one magnetic sensitive axis direction, which is not limited here.

[0059] Exemplarily, the first current detection module 1000 may include 3 uniaxial magnetic field measurement chips, and these 3 uniaxial magnetic field measurement chips are equidistantly distributed on the circumference with a radius of R0, thus forming an annular array (i.e., the first current detection module 1000). In the annular array, the magnetic sensitive axis directions of these 3 uniaxial magnetic field measurement chips are tangent to the circumference in the same clockwise direction (i.e., the clockwise or counterclockwise direction), so that when the magnetic field generated by the conductor to be measured acts along the tangent direction of the circumference, these 3 uniaxial magnetic field measurement chips can most effectively detect the magnetic field. Thereby improving the measurement accuracy of the magnetic induction unit for the magnetic field, and further improving the accuracy of the first current detection module for current measurement.

[0060] The second current detection module 2000 is continuously arranged around the center of the circle.

[0061] In this embodiment, the center of the second current detection module is the center of the first current detection module.

[0062] Exemplarily, when the first current detection module is an annular array, its center is the center of the annular array. The second current detection module 2000 may be a Rogowski coil continuously arranged around the center of the circle, etc.

[0063] The current determination method of the embodiment of the present application may specifically be implemented by the current determination device 3000 in the current sensor. According to Figure 2As shown, the current determination method of this embodiment may include the following steps S2100 to S2400:

[0064] Step S2100, obtain a first current value of the conductor under test detected by the first current detection module, and obtain a second current value of the conductor under test detected by the second current detection module.

[0065] In this embodiment, when detecting the current of the conductor under test through a current sensor, the current sensor is placed around the conductor under test, that is, the main extension direction of the conductor under test is substantially orthogonal to the main extension plane of the current sensor, and the conductor under test is approximately located at the position of the center of the first current detection module and the second current detection module. At this time, the first current detection module detects the conductor under test to obtain a first current value, and the second current detection module detects the conductor under test to obtain a second current value.

[0066] In some embodiments, step S2100 of obtaining the first current value of the conductor under test detected by the first current detection module includes: step S2100.1 and step S2100.3.

[0067] Step S2100.1, obtain the magnetic induction intensity values detected by each of the multiple magnetic induction units.

[0068] For example, as Figure 3 shown, the first current detection module is an annular array composed of a first magnetic induction unit, a second magnetic induction unit, and a third magnetic induction unit. When measuring the current of the conductor under test, the conductor under test is located at the intersection position as Figure 3 shown, and the main extension direction of the conductor under test is substantially orthogonal to the main extension plane of the first current detection module. The distance between the conductor under test and the first magnetic induction unit is R1, the distance between the conductor under test and the second magnetic induction unit is R2, and the distance between the conductor under test and the third magnetic induction unit is R3. At a certain moment t, the magnetic induction intensity value output by the first magnetic induction unit is the first magnetic induction intensity value B1, the magnetic induction intensity value output by the second magnetic induction unit is the second magnetic induction intensity value B2, and the magnetic induction intensity value output by the second magnetic induction unit is the third magnetic induction intensity value B3.

[0069] Step S2100.3, determine the first current value of the conductor under test detected by the first current detection module according to the magnetic induction intensity values detected by each magnetic induction unit and the preset conversion relationship.

[0070] In this embodiment, the average magnetic induction intensity value detected by multiple magnetic induction units can be calculated first, and then, according to the preset conversion relationship and the average magnetic induction intensity value, the first current value of the conductor under test is determined. Among them, the preset conversion relationship is the conversion relationship reflecting the conversion between the first current value and the average magnetic induction intensity value detected by multiple magnetic induction units.

[0071] In one embodiment, the preset conversion relationship is derived through the following formula, specifically as follows:

[0072] Continuing with the example where the first current detection module includes 3 magnetic induction units, at a certain moment t, the relationship between the first magnetic induction intensity value B1 and the first current value I is as shown in the following formula (1):

[0073]

[0074] where I is the first current value and μ0 is the magnetic permeability of vacuum.

[0075] The relationship between the second magnetic induction intensity value B2 and the first current value is as shown in the following formula (2):

[0076]

[0077] The relationship between the second magnetic induction intensity value B3 and the first current value is as shown in the following formula (3):

[0078]

[0079] Taking the average of the first magnetic induction intensity value, the second magnetic induction intensity value, and the third magnetic induction intensity value, the average magnetic induction intensity value B is obtained. OUT The conversion relationship between the average magnetic induction intensity value B and the first current value I is as shown in formula (4):

[0080]

[0081] Rearranging the above formula, we get formula (5):

[0082]

[0083] Let Then the conversion relationship between the average magnetic induction intensity value and the first current value can be simplified to the following formula (6):

[0084] B out (t) = ε * I(t) (6)

[0085] where ε is the conversion coefficient.

[0086] From the expression of the conversion coefficient ε, it can be seen that it is related to the positions (R1, R2, R3) of the conductor to be measured during actual temperature measurement. During actual temperature measurement, the specific values of R1, R2, and R3 are unknown. To simplify the calculation, the standard conversion coefficient ε0 between the standard current and the standard average magnetic induction intensity value can be used as the conversion coefficient ε between the first current value and the average magnetic induction intensity value during actual measurement.

[0087] When determining the standard conversion coefficient ε0 between the standard current and the standard average magnetic induction intensity value, it is necessary to first use three magnetic induction units to detect the standard average magnetic induction intensity B0 of the standard conductor of the standard current I0, and then calculate the standard conversion coefficient ε0 according to B0 = ε0 * I0.

[0088] Then, the preset conversion relationship between the first current value I(t) and the average magnetic induction intensity value B out (t) as shown in formula (7) can be obtained:

[0089]

[0090] In some embodiments, obtaining the second current value of the conductor under test detected by the second current detection module in step S2100 includes step S2100.2 and step S2100.4.

[0091] Step S2100.2, obtaining the induced voltage output by the second current detection module.

[0092] Step S2100.4, determining the second current value of the conductor under test according to the induced voltage.

[0093] Exemplarily, taking the second current detection module as a Rogowski coil, the above steps S2100.2 and S2100.4 are described.

[0094] A Rogowski coil is a hollow toroidal coil. When the coil is evenly wound and the cross-sectional area of each turn is equal everywhere and the magnetic induction intensity at each point of the cross-section is the same, its induced voltage E(t) can be expressed by the following formula (8):

[0095] E(t) = M * dI p (t) / dt (8)

[0096] Wherein, E(t) is the induced voltage, M is the mutual inductance coefficient, I p (t) is the second current value, dI p (t) / dt is the current change rate of the second current value, indicating the change of the current with time. M = μ0 * n * s, μ0 is the vacuum permeability, n is the turn density, and S is the cross-sectional area.

[0097] According to the above formula (8), the relationship between the second current value I p (t) and the induced voltage E(t) is as shown in formula (9):

[0098]

[0099] Step S2200, determining whether the central position of the conductor under test deviates from the center of the circle according to the first current value and the second current value.

[0100] In this embodiment, when the central position of the conductor to be measured deviates relative to the center of the circle, the magnetic field distribution is asymmetric, resulting in uneven magnetic induction intensity values measured by multiple magnetic induction units in the first current detection module. As a result, the first current value measured by the first current detection module deviates significantly from the true current value of the conductor to be measured. Since the second current detection module has a continuous structure, the symmetry requirement of the magnetic field distribution for the second current value it outputs is relatively low. That is to say, even if the central position of the conductor to be measured deviates relative to the center of the circle, the second current value will not deviate significantly from the true current value of the conductor to be measured.

[0101] Based on this, it is possible to determine whether the central position of the conductor to be measured deviates relative to the center of the circle by comparing the first current value and the second current value.

[0102] In some embodiments, in step S2200, determining whether the central position of the conductor to be measured deviates relative to the center of the circle according to the first current value and the second current value includes: step S2200.1 and step S2200.2.

[0103] In step S2200.1, when the current difference between the first current value and the second current value is greater than or equal to the current difference threshold, it is determined that the central position of the conductor to be measured deviates relative to the center of the circle.

[0104] In this embodiment, the current difference threshold may be the critical value of the current difference between the first current value and the second current value set for detecting whether the central position of the conductor to be measured deviates relative to the center of the circle.

[0105] The current difference threshold may be the maximum value of the current difference between the first current value measured by the first current detection module and the second current value measured by the second current detection module in multiple standard test experiments, that is, when conducting standard test experiments on a conductor with a standard current and the central position of the standard conductor does not deviate relative to the center of the circle.

[0106] The current difference threshold can be flexibly set by the designer according to the test accuracy requirements, and its specific value is not limited here.

[0107] In step S2200.2, when the current difference between the first current value and the second current value is less than the current difference threshold, it is determined that the central position of the conductor to be measured does not deviate relative to the center of the circle.

[0108] In step S2300, when the central position of the conductor to be measured deviates relative to the center of the circle, the second current value is determined as the measured current value of the conductor to be measured.

[0109] In this embodiment, when the central position of the conductor under test deviates from the center of the circle, the error between the first current value measured by the first current detection module and the true current value of the conductor under test is relatively large, while the error between the first current value measured by the second current detection module and the true current value of the conductor under test is relatively small. At this time, using the second current value measured by the second current detection module as the measured current value of the conductor under test can avoid the influence of the deviation of the central position of the conductor under test from the center of the circle on the accuracy of current measurement and improve the accuracy of current detection.

[0110] In some embodiments, when the central position of the conductor under test deviates from the center of the circle in step S2300, the method further includes:

[0111] Outputting a position deviation prompt message.

[0112] In this embodiment, by outputting a position deviation prompt message when the central position of the conductor under test deviates from the center of the circle, the user can be prompted to adjust the position of the conductor under test so that the central position of the conductor under test is close to the center of the circle position. And, by outputting a position deviation prompt message, it is also convenient for the user to know that the currently output measured current value of the conductor under test is the second current value detected by the second current detection module when the central position of the conductor under test deviates from the center of the circle. Thus, it is convenient for the user to choose whether to adjust the central position of the conductor under test according to the application scenario of the current sensor.

[0113] Since in the application scenario of testing high-frequency current, the second current value output by the second current detection module is used as the measured current value of the conductor under test. Therefore, when a position deviation prompt message is output, the central position of the conductor under test can not be adjusted, and the second current value detected by the second current detection module can be directly used as the measured current value of the conductor under test.

[0114] Since in the application scenario of testing low-frequency current, the first current value output by the first current detection module is used as the measured current value of the conductor under test. Therefore, when a position deviation prompt message is output, the central position of the conductor under test needs to be adjusted so that the central position of the conductor under test does not deviate from the center of the circle, improving the measurement accuracy of the first current detection module for current to meet the current test requirements in the low-frequency current scenario.

[0115] The inventor found that since the current measurement principle of the second current detection module is: the changing magnetic field around the conductor under test will generate an induced voltage in the second current detection module, and then by integrating the induced voltage, the second current value can be obtained. Based on its measurement principle, the second current detection module can quickly capture the changes of high-frequency current and provide high-precision measurement results, which is suitable for the measurement of high-frequency current. In the measurement of low-frequency current, the integration process will introduce integration drift and integration noise, affecting the detection accuracy of low-frequency current.

[0116] The current measurement principle of the first current detection module is as follows: the measurement results of multiple magnetic induction units are used for data fusion to obtain the first current value. Based on its measurement principle, the method of calculating the first current value by the first current detection module through data fusion, compared with the method of obtaining the second current value by the second current detection module through integral processing, can improve the accuracy of current measurement. However, in high-frequency current measurement, the response speed of the magnetic induction unit may not be able to keep up with the change of the high-frequency current signal, resulting in a large measurement error.

[0117] Based on the above reasons, it can be concluded that the detection accuracy of the first current detection module for low-frequency current is higher than that of the second current detection module for low-frequency current, and the detection accuracy of the second current detection module for high-frequency current is higher than that of the first current detection module for high-frequency current. Therefore, in order to further improve the accuracy of current detection, when it is determined that the central position of the conductor to be measured does not deviate relative to the center of the circle, it is necessary to determine the current frequency type of the conductor to be measured currently detected, and then determine the measured current value of the current to be measured according to the current frequency type of the conductor to be measured currently detected.

[0118] Based on this, in some embodiments, after step S2200 of determining whether the central position of the conductor to be measured deviates relative to the center of the circle according to the first current value and the second current value, the method further includes: step S3100 and step S3200.

[0119] Step S3100, when the central position of the conductor to be measured does not deviate relative to the center of the circle, obtain the current frequency type of the conductor to be measured.

[0120] In this embodiment, the current frequency type of the conductor to be measured can be a low-frequency type or a high-frequency type.

[0121] The current frequency type of the conductor to be measured can be obtained through an independently set frequency analysis device, or through a frequency analysis module built into the current sensor. The acquisition method of the current frequency type of the conductor to be measured is not limited here.

[0122] In some embodiments, obtaining the current frequency type of the conductor to be measured in step S3100 includes: step S3100.1 and step S3100.2.

[0123] Step S3100.1, obtain the current time series of the conductor to be measured detected by the target current detection module within a set historical duration.

[0124] In this embodiment, when the central position of the conductor to be measured does not deviate relative to the center of the circle, the current time series of the conductor to be measured detected by the target current detection module within a set historical duration.

[0125] The set historical duration can be, for example, the most recent 1 ms, or the most recent 1 μs, etc., and is not limited here.

[0126] The target current detection module can be the first current detection module or the second current detection module, and is not limited here.

[0127] The current time series reflects the change of the current value detected by the target current detection module over time within the set historical duration.

[0128] Step S3100.2: Determine the current frequency type of the conductor to be measured according to the current time series of the conductor to be measured.

[0129] In one example, the current frequency type of the conductor to be measured can be determined according to the rise time and fall time in the current time series.

[0130] In this example, the rise time can be the time between the minimum current value and the maximum current value in the current time series, that is, half of the cycle time. The fall time can be the time between the maximum current value and the minimum current value in the current time series, that is, half of the cycle time. If the sum of the rise time and the fall time (i.e., the cycle time) is greater than the cycle time threshold (such as 5 microseconds), the current frequency type is the high-frequency type. If the cycle time is less than or equal to the cycle time threshold, the current frequency type is the low-frequency type.

[0131] In another example, the current time series can be transformed into the frequency domain, and the current frequency type can be determined according to the frequency distribution of the current in the frequency domain.

[0132] Those skilled in the art should understand that the specific method for determining the current frequency type of the conductor to be measured according to the current time series of the conductor to be measured is not limited here.

[0133] In some embodiments, in step S3100.2, determining the current frequency type of the conductor to be measured according to the current time series of the conductor to be measured includes: steps S3100.21 to S3100.23.

[0134] Step S3100.21: Determine the main current frequency of the conductor to be measured according to the current time series of the conductor to be measured.

[0135] In this embodiment, the current time series of the conductor to be measured can be transformed into the frequency domain to obtain the current frequency distribution of the conductor to be measured. The current frequency distribution can reflect the distribution of the amplitude values of the current signal at different frequencies.

[0136] Exemplarily, the current time series can be transformed into the frequency domain through Fourier transform to obtain the current frequency distribution of the conductor to be measured.

[0137] Determine the main current frequency of the conductor to be measured according to the current frequency distribution of the conductor to be measured. Among them, the main current frequency can be the frequency component with the largest amplitude value of the current signal in the current frequency distribution.

[0138] Step S3100.22, when the main current frequency of the conductor to be measured is less than or equal to the frequency threshold, determine that the current frequency type of the conductor to be measured is the low-frequency type.

[0139] In this embodiment, the frequency threshold can be a frequency value set for determining the current frequency type. The frequency threshold can be set according to the maximum frequency value of the current signal that the first current detection module can accurately detect, or can be set according to design requirements, and is not limited here.

[0140] Step S3100.23, when the main current frequency of the conductor to be measured is greater than the frequency threshold, determine that the current frequency type of the conductor to be measured is the high-frequency type.

[0141] Exemplarily, the frequency threshold can be 200 kHz. If the main current frequency of the conductor to be measured is 100 kHz, then the current frequency type of the conductor to be measured is the low-frequency type. If the main current frequency of the conductor to be measured is 250 kHz, then the current frequency type of the conductor to be measured is the high-frequency type.

[0142] Step S3200, determine the measured current value of the conductor to be measured according to the current frequency type of the conductor to be measured.

[0143] Since the detection accuracy of the first current detection module for low-frequency current is higher than that of the second current detection module for low-frequency current, and the detection accuracy of the second current detection module for high-frequency current is higher than that of the first current detection module for high-frequency current.

[0144] In these embodiments, in step S3200, determining the measured current value of the conductor to be measured according to the current frequency type of the conductor to be measured includes: steps S3200.1 to S3200.2.

[0145] Step S3200.1, when the current frequency type of the conductor to be measured is the low-frequency type, determine the first current value as the measured current value of the conductor to be measured.

[0146] In this embodiment, in the case of the low-frequency type, since the detection accuracy of the first current detection module is higher, the first current value output by the first current detection module is used as the measured current value of the conductor to be measured.

[0147] Step S3200.2, when the current frequency type of the conductor to be measured is the high-frequency type, determine the second current value as the measured current value of the conductor to be measured.

[0148] In this embodiment, since the detection accuracy of the second current detection module is higher in the case of a high-frequency type, the second current value output by the second current detection module is used as the measured current value of the conductor to be measured.

[0149] Step S2400: Output the measured current value of the conductor to be measured.

[0150] According to the embodiment of the present application, by using the second current value measured by the second current detection module as the measured current value of the conductor to be measured when the central position of the conductor to be measured deviates relative to the center of the circle, it is possible to avoid the influence of the deviation of the central position of the conductor to be measured relative to the center of the circle on the accuracy of current measurement and improve the accuracy of current detection.

[0151] By obtaining the current frequency type of the conductor to be measured when the central position of the conductor to be measured does not deviate relative to the center of the circle and determining the measured current value of the conductor to be measured according to the current frequency type of the conductor to be measured, it is possible to improve the detection accuracy of the current sensor for both high-frequency currents and low-frequency currents and improve the accuracy of current detection.

[0152] <Device Embodiment>

[0153] Figure 4 FIG. is a schematic block diagram of a current determination device 400 according to an embodiment of the present application.

[0154] In this embodiment, as Figure 4 shown, the current determination device 400 includes a memory 410 and a processor 420. The memory 410 is used to store executable instructions; the processor 420 is used to operate according to the control of the instructions to execute the method described in any of the above method embodiments.

[0155] Figure 5 FIG. is a schematic block diagram of a current sensor according to an embodiment of the present application.

[0156] In this embodiment, as Figure 5 shown, the current sensor 500 includes a first current detection module 510, a second current detection module 520, and a current determination device 530. The first current detection module 510 detects the conductor to be measured to obtain a first current value and sends the first current value to the current determination device 530. The second current detection module 520 detects the conductor to be measured to obtain a second current value and sends the second current value to the current determination device 530.

[0157] In some embodiments, the current determination device 530 may be the current determination device shown in Figure 1 FIG. or the current determination device shown in Figure 4 FIG.

[0158] In some embodiments, the current sensor may also be as Figure 1 shown in the current sensor.

[0159] This application may be a system, a method, and / or a computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions thereon for causing a processor to implement various aspects of this application.

[0160] A computer-readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. A computer-readable storage medium may be, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device such as a punch card or raised structures in a groove having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium as used herein is not construed as being a transitory signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., an optical pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0161] The computer-readable program instructions described herein may be downloaded to each computing / processing device from a computer-readable storage medium, or may be downloaded to an external computer or external storage device through a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0162] The computer program instructions for performing the operations of the present application may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via an Internet service provider through the Internet). In some embodiments, by using the state information of the computer-readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the present application.

[0163] Aspects of the present application are described herein with reference to the flowchart and / or block diagram of a method, apparatus (system), and computer program product according to embodiments of the present application. It should be understood that each block of the flowchart and / or block diagram, and the combinations of blocks in the flowchart and / or block diagram, can be implemented by computer-readable program instructions.

[0164] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine such that when these instructions are executed by the processor of the computer or other programmable data processing device, a device is produced that implements the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause a computer, a programmable data processing device, and / or other devices to work in a specific manner. Thus, the computer-readable medium storing the instructions includes a manufactured article that includes instructions for implementing various aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0165] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices, causing a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other devices to generate a computer-implemented process such that the instructions executed on the computer, other programmable data processing apparatus, or other devices implement the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0166] The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of an instruction, which contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two consecutive blocks may in fact be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block of the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or by a combination of dedicated hardware and computer instructions. As is well known to those skilled in the art, implementation by hardware, implementation by software, and implementation by a combination of software and hardware are equivalent.

[0167] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of technologies in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein. The scope of the present application is defined by the appended claims.

Claims

1. A method for determining current, characterized in that: Applied to a current sensor, the current sensor includes a first current detection module and a second current detection module, the first current detection module includes a plurality of magnetic induction units, the plurality of magnetic induction units are equidistantly distributed around a circumference of a circle center, and the second current detection modules are continuously arranged around the circle center, the method includes: Acquire a first current value of the conductor to be measured detected by the first current detection module, and acquire a second current value of the conductor to be measured detected by the second current detection module; Determine, according to the first current value and the second current value, whether the center position of the conductor to be measured deviates from the center of the circle; In the case where the center position of the conductor to be measured deviates from the center of the circle, determining the second current value as the actual measured current value of the conductor to be measured; The actual measured current value of the conductor to be measured is outputted.

2. The method according to claim 1, characterized in that The method further comprises: When the center position of the conductor to be measured does not deviate from the center of the circle, obtaining the current frequency type of the conductor to be measured; The actual measured current value of the conductor to be measured is determined according to the current frequency type of the conductor to be measured.

3. The method according to claim 2, characterized in that The detection accuracy of the first current detection module for low-frequency current is higher than that of the second current detection module for low-frequency current, the detection accuracy of the second current detection module for high-frequency current is higher than that of the first current detection module for high-frequency current, and the determination of the measured current value of the conductor to be measured according to the current frequency type of the conductor to be measured includes: In a case where the current frequency type of the conductor to be measured is a low frequency type, determining the first current value as the actual measured current value of the conductor to be measured; In a case where the current frequency type of the conductor to be measured is a high frequency type, the second current value is determined as the actual measured current value of the conductor to be measured.

4. The method according to claim 2, characterized in that: The step of obtaining the current frequency type of the conductor to be measured comprises: Obtaining a current time series of the conductor to be tested detected by a target current detection module within a set historical time length; wherein the target current detection module is one of the first current detection module and the second current detection module, and the current time series reflects the change of the current value detected by the target current detection module over time within the set historical time length; The current frequency type of the conductor to be measured is determined according to the current time series of the conductor to be measured.

5. The method according to claim 4, characterized in that The step of determining the current frequency type of the conductor to be measured according to the current time series of the conductor to be measured comprises: Determining the main current frequency of the conductor to be measured according to the current time series of the conductor to be measured; When the main current frequency of the conductor to be measured is less than or equal to a frequency threshold, determining that the current frequency type of the conductor to be measured is a low frequency type; When the main current frequency of the conductor to be measured is greater than the frequency threshold, it is determined that the current frequency type of the conductor to be measured is a high frequency type.

6. The method according to claim 1, characterized in that The step of determining whether the center position of the conductor to be measured deviates from the center of the circle according to the first current value and the second current value includes: When the current difference between the first current value and the second current value is greater than or equal to a current difference threshold, determining that the center position of the conductor to be measured deviates from the center of the circle; When the current difference between the first current value and the second current value is less than the current difference threshold, it is determined that the center position of the conductor to be measured does not deviate from the center of the circle.

7. The method according to claim 1, characterized in that In the case where the center position of the conductor to be measured deviates from the center of the circle, the method further includes: Output position deviation prompt information.

8. The method according to claim 1, characterized in that The obtaining of a first current value of the conductor to be measured detected by the first current detection module includes: Obtaining a magnetic induction intensity value detected by each magnetic induction unit of the plurality of magnetic induction units; The first current value of the conductor to be measured detected by the first current detection module is determined according to the magnetic induction intensity value detected by each magnetic induction unit and a preset conversion relationship.

9. A current determination device, comprising a memory and a processor, wherein the memory is used to store executable instructions; and the processor is used to operate according to the control of the instructions to execute the method according to any one of claims 1 to 8.

10. A current sensor, characterized in that: The method comprises a first current detection module and a second current detection module, and a current determination device as described in claim 9, wherein the first current detection module detects the conductor to be measured to obtain a first current value, and sends the first current value to the current determination device, and the second current detection module detects the conductor to be measured to obtain a second current value, and sends the second current value to the current determination device.

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