A fluxgate current sensing device and a fluxgate current sensing method

Abstract

The application provides a fluxgate current detection device and a fluxgate current detection method. The device comprises: a power excitation module connected to an excitation induction module, which is used to generate an excitation signal to make the excitation induction module generate a periodic magnetic signal; the excitation induction module comprises at least two excitation induction sub-modules, each of which comprises an excitation magnetic core and a winding around the excitation magnetic core, and the time periods of the excitation signals obtained by the at least two excitation induction sub-modules are different; the excitation induction module is further used to couple a to-be-detected magnetic signal generated by an external current signal and the periodic magnetic signal to generate an output electric signal containing information of the external current signal; and a signal processing module connected to the excitation induction module, which is used to obtain the information of the external current signal according to the output electric signal and output the information of the external current signal. The application improves the measurable frequency range, reduces the frequency of the excitation signal, and has lower requirements for the material of the excitation magnetic core.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of current detection, and more particularly to a fluxgate current detection device and a fluxgate current detection method. BACKGROUND

[0002] Current is an important basic physical quantity, which can indirectly calculate or reflect physical quantities such as magnetic field strength, displacement, fluid flow rate, heat, light, etc. that are not easy to measure directly, so the accurate and rapid measurement of current parameters is particularly important. Researchers have been committed to exploring the method of current detection. From the early direct measurement of resistance method, to the later series of indirect detection methods or devices such as magnetoelectric meter, shunt, mutual inductor, Rogowski coil, Hall sensor, fluxgate sensor, current detection chip, the size, frequency and accuracy of the detectable current are gradually strengthened.

[0003] The current detection device based on the fluxgate principle is to cause the magnetic field strength of the excitation magnetic core to change periodically through the excitation signal, and to extract the external magnetic field information through a series of electromagnetic coupling and circuit decoupling methods, thereby indirectly representing the information of the external current signal to be measured. The information of the external current signal includes current intensity information and time information, etc. The time information is usually represented by frequency, and it is particularly important for the current detection device to be able to realize wide bandwidth current signal detection function. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiments section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solutions, nor to attempt to determine the protection scope of the claimed technical solutions.

[0005] The present application provides a fluxgate current detection device, which comprises:

[0006] A power excitation module connected to the excitation sensing module, configured to generate an excitation signal to cause the excitation sensing module to generate a periodic magnetic signal;

[0007] The excitation sensing module comprises at least two excitation sensing sub-modules, each of which comprises an excitation magnetic core and a winding around the excitation magnetic core, and the excitation signals obtained by the at least two excitation sensing sub-modules have a phase difference;

[0008] The excitation sensing module is further configured to couple the periodic magnetic signal and a to-be-measured magnetic signal generated by an external current signal to generate an output electrical signal containing information of the external current signal;

[0009] A signal processing module is connected to the excitation sensing module, and is configured to obtain information of the external current signal according to the output electric signals output by the at least two excitation sensing sub-modules, and output the information of the external current signal.

[0010] In some embodiments, the device further comprises a magnetic concentration module configured to induce an external current signal to generate the to-be-detected magnetic signal.

[0011] In some embodiments, the excitation signals received by different excitation sensing sub-modules have equal amplitudes and / or equal frequencies.

[0012] In some embodiments, the excitation sensing module comprises at least two groups of excitation sensing sub-modules, each group of excitation sensing sub-modules comprises two excitation sensing sub-modules, and the directions of the excitation signals obtained by the two excitation sensing sub-modules in the same group are opposite.

[0013] The information of the external current signal is obtained according to the output electric signals output by the at least two excitation sensing sub-modules, and the information of the external current signal comprises:

[0014] The output electric signals output by the two excitation sensing sub-modules in each group are coupled to eliminate the information of the excitation signals in the output electric signals, and to obtain partial information of the external current signal.

[0015] The partial information corresponding to the at least two groups of excitation sensing sub-modules is integrated to obtain the information of the external current signal.

[0016] In some embodiments, the excitation sensing module comprises two groups of excitation sensing sub-modules, and the phase difference of the excitation signals obtained by the two groups of excitation sensing sub-modules is 90°.

[0017] In some embodiments, the sizes of the excitation magnetic cores of the at least two excitation sensing sub-modules are the same.

[0018] In some embodiments, the excitation magnetic cores of the at least two excitation sensing sub-modules are arranged side by side.

[0019] In some embodiments, the frequency of the excitation signal is less than or equal to the frequency of the external current signal.

[0020] In some embodiments, the magnetic core is a closed-loop magnetic core or a non-closed-loop magnetic core.

[0021] Another aspect of the embodiment of the present application provides a magnetic flux gate current detection method, and the method comprises:

[0022] The control power excitation module generates an excitation signal and outputs the excitation signal to an excitation induction module to make the excitation induction module generate a periodic magnetic signal, wherein the excitation induction module comprises at least two excitation induction sub-modules, each of the excitation induction sub-modules comprises an excitation magnetic core and a winding around the excitation magnetic core, and the excitation signals obtained by the at least two excitation induction sub-modules have a phase difference;

[0023] The excitation induction module couples the to-be-detected magnetic signal generated by the external current signal and the periodic magnetic signal to generate an output electric signal containing information of the external current signal;

[0024] The information of the external current signal is obtained according to the output electric signals output by the at least two excitation induction sub-modules, and the information of the external current signal is output.

[0025] In some embodiments, the amplitudes of the excitation signals received by different excitation induction sub-modules are equal and / or the frequencies of the excitation signals received by different excitation induction sub-modules are equal.

[0026] In some embodiments, the excitation induction module comprises at least two groups of excitation induction sub-modules, each group of excitation induction sub-modules comprises two excitation induction sub-modules, and the directions of the excitation signals obtained by the two excitation induction sub-modules in the same group are opposite.

[0027] The information of the external current signal is obtained according to the output electric signals output by the at least two excitation induction sub-modules, and the information of the external current signal is output.

[0028] The output electric signals output by the two excitation induction sub-modules in each group are coupled to eliminate the information of the excitation signals in the output electric signals and obtain partial information of the external current signal.

[0029] The partial information corresponding to the at least two groups of excitation induction sub-modules is integrated to obtain the information of the external current signal.

[0030] In some embodiments, the excitation induction module comprises two groups of excitation induction sub-modules, and the phase difference of the excitation signals obtained by the two groups of excitation induction sub-modules is 90°.

[0031] In some embodiments, the frequency of the excitation signal is less than or equal to the frequency of the external current signal.

[0032] The magnetic flux gate current detection device and the magnetic flux gate current detection method of the embodiments of the present application improve the frequency range of the measurable external current signal, reduce the frequency of the excitation signal, and have lower requirements for the material of the excitation magnetic core. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like elements throughout. The accompanying drawings are intended to provide a further understanding of the present application and are incorporated and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain the present application. The drawings are not intended to be an exhaustive description of the present application and do not imply any limitation upon the scope of the present application. In the drawings, like reference numerals designate corresponding parts throughout the various figures.

[0034] Figure 1 is a schematic block diagram of a fluxgate current sensing device of one embodiment of the present application;

[0035] Figure 2 is a schematic diagram of an excitation sensing sub-module of another embodiment of the present application;

[0036] Figure 3 is a schematic diagram of an output electrical signal output from an excitation sensing sub-module of one embodiment of the present application;

[0037] Figure 4 is a schematic flow diagram of a fluxgate current sensing method of one embodiment of the present application. DETAILED DESCRIPTION

[0038] In the following description, numerous specific details are given to provide a thorough understanding of the present application. However, it will be apparent that the present application can be practiced without one or more of these specific details. In other instances, well-known techniques have not been described in order to avoid obscuring the present application. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without one or more of these specific details.

[0039] It is to be understood that the present application can be implemented in various forms of hardware, software, or combinations thereof, and that the present application should not be limited to the aforementioned embodiments. Rather, the embodiments are provided as examples of the present application so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions are exaggerated for clarity. Identical reference numerals designate identical elements throughout the various figures.

[0040] It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0041] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] For a thorough understanding of the present application, reference should be made to the following detailed description, in conjunction with the accompanying drawings, in which:

[0044] The excitation induction module is the core of a current detection device based on the flux gate principle, and is generally composed of an excitation winding and an excitation magnetic core. An electronic circuit generates a current signal or a voltage signal on the excitation winding, which correspondingly causes the magnetic field intensity of the excitation magnetic core to periodically change. Through a series of electromagnetic coupling and circuit decoupling methods, the information of the external current signal is extracted. The information of the external current signal includes current intensity information and time information, and the time information is usually represented by frequency, with a frequency range from DC to THz or even higher. Wide bandwidth current signal detection is particularly important for the current detection device.

[0045] The current wide bandwidth current detection device has an excitation magnetic core using the flux gate principle and an excitation magnetic core using the magnetic induction principle. The former detects a current signal of DC-10 kHz, and the latter detects a current signal higher than 10 kHz. Through signal processing, analysis and compensation, the information of the external current signal in the measurement frequency range is directly measured or calculated.

[0046] The above wide bandwidth current detection technology has the following disadvantages:

[0047] Since two different ways are used to measure current information of different frequencies, that is, there are different interferences, which will ultimately affect the output electric signal and reduce the measurement accuracy;

[0048] The excitation signal of the flux gate current detection device needs to be higher than the external current signal in the order of magnitude, which requires higher magnetic material and increases magnetic loss, resulting in high power consumption of the detection device;

[0049] Due to the limitation of the excitation signal frequency, the measurement frequency range of the detection device is limited, so that the measurement frequency range of the flux gate current detection device is narrow.

[0050] Therefore, the embodiment of the present application proposes a new flux gate current detection device and a flux gate current detection method with large range, high reliability and high precision, which can avoid the above-mentioned shortcomings. The flux gate current detection device and the flux gate current detection method of the embodiment of the present application will be described in detail below with reference to the drawings. In the case of no conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0051] Reference Figure 1The magnetic flux gate current detection device 100 of the embodiment of the present application at least comprises a power excitation module 110, an excitation induction module 120 and a signal processing module 130. The power excitation module 110 is connected to the excitation induction module 120 and is used to generate an excitation signal to make the excitation induction module 120 generate a periodic magnetic signal. The excitation induction module 120 comprises at least two excitation induction sub-modules, each of which comprises an excitation magnetic core and a winding around the excitation magnetic core, and the excitation signals obtained by the at least two excitation induction sub-modules have a phase difference. The excitation induction module 120 is also used to couple the to-be-detected magnetic signal and the periodic magnetic signal to generate an output electric signal containing information of the external current signal. The signal processing module 130 is connected to the excitation induction module 120 and is used to obtain the information of the external current signal according to the output electric signals output by the at least two excitation induction sub-modules and output the information of the external current signal. In some embodiments, the magnetic flux gate current detection device 100 further comprises a magnetic concentration feedback module 140 which is used to induce the external current signal to generate the to-be-detected magnetic signal.

[0052] The magnetic flux gate current detection device 100 of the embodiment of the present application can be used to detect a wide-band external current signal. The magnetic flux gate current detection device 100 as a whole comprises a magnetic circuit part and an electronic circuit part. The magnetic concentration feedback module 140 and the excitation induction module 120 belong to the magnetic circuit part, the power excitation module 110 and the signal processing module 130 belong to the electronic circuit part, and the magnetic circuit part and the electronic circuit part together constitute a current detection device to indirectly detect the external current signal.

[0053] Specifically, the excitation signal generated by the power excitation module 110 is a voltage signal or a current signal with a certain frequency. After the excitation signal is output to the excitation induction module 120, the excitation induction module 120 generates a periodic magnetic signal, which is coupled with the to-be-detected magnetic signal generated by the external current signal on the magnetic concentration feedback module 140 to generate an output electric signal containing information of the external current signal. The output electric signal can be a current signal or a voltage signal. The output electric signal is output to the signal processing module 130, and the information of the external current signal is output after being processed by the signal processing module 130. The information of the external current signal includes signal strength information and / or time information.

[0054] In some embodiments, the magnetic flux gate current detection device 100 can further comprise a feedback module 150 connected to the signal processing module 130 and the magnetic concentration feedback module 140 and used to output the external current information by feedback compensation. For example, the feedback module 150 comprises a feedback winding, and the signal processing module 130 outputs a feedback signal to the feedback winding to offset the magnetic field strength in the space where the magnetic concentration feedback module 140 is located, so as to improve the resolution of the detection device and adjust to a suitable range by feedback.

[0055] For example, the excitation signal is generated by the oscillation signal output from the fluxgate oscillator, and both the oscillation signal and the corresponding excitation signal are signals with fixed frequency and phase. The excitation signal is used to bring the magnetic core into a periodic saturation state. The excitation signal can be a current excitation signal or a voltage excitation signal; the voltage excitation signal can be a sine wave, square wave, triangular wave, etc. For example, the power excitation module 110 is also connected to a controller and outputs the excitation signal under the control of the controller. Specifically, the power excitation module 110 is connected to the excitation winding of the excitation induction submodule and is used to send the excitation signal to the excitation winding.

[0056] The excitation sensing module 120 of this embodiment includes multiple excitation sensing sub-modules. Each excitation sensing sub-module includes an excitation magnetic core and a winding surrounding the excitation magnetic core. The winding may include an excitation winding and a detection winding. The excitation winding is connected to the power excitation module 110, and the detection winding is connected to the signal processing module 130. Each excitation sensing sub-module is independent of the others, that is, it respectively acquires the excitation signal output by the power excitation module 110 and respectively feeds back the output electrical signal to the signal processing module 130.

[0057] Figure 2 A simplified diagram of the excitation sensing submodule is shown. Figure 2 The diagram shows four excitation sensing submodules. Each excitation sensing submodule includes an excitation core 210 and an excitation winding (not shown) uniformly wound around the excitation core 210. The four excitation sensing submodules are coupled to the same magnetic feedback module 140 in the magnetic circuit. Therefore, the output electrical signal of each excitation sensing submodule contains information about the external current signal.

[0058] It should be noted that the arrangement of the excitation core 210 is not limited to the following. Figure 2 As shown in the arrangement, multiple excitation cores can be arranged as follows: Figure 2 The side-by-side arrangement shown can also be placed at different positions within the magnetic feedback module 140. Even multiple excitation cores 210 can be located in different magnetic fields to combine detection of magnetic fields at different locations. The shape of the excitation cores 210 is not limited to... Figure 2 The rectangular shape shown, for example, can also be circular, annular, polygonal, or other shapes. The excitation core 210 can be a closed-loop core or a non-closed-loop core. The dimensions of the excitation cores of different excitation sensing submodules can be the same or different.

[0059] In the plurality of excitation sensing submodules of this invention, at least two excitation sensing submodules acquire excitation signals with a phase difference. For example, the time period lengths of the excitation signals acquired by at least two excitation sensing submodules are equal, but the start or end times of the periods are different. Because there is a phase difference between the excitation signals acquired by at least two excitation sensing submodules, there is also a phase difference between the output electrical signals output by these at least two excitation sensing submodules. By integrating the output electrical signals from these at least two excitation sensing submodules, complete information about the external current signal can be obtained.

[0060] Furthermore, the excitation signals received by different excitation sensing submodules have equal amplitudes and / or equal frequencies to facilitate signal processing.

[0061] In some embodiments, the excitation sensing module includes at least two sets of excitation sensing sub-modules, each set including two excitation sensing sub-modules, and the excitation signals acquired by the two excitation sensing sub-modules in the same set are in opposite directions. The signal processing module 130 couples the output electrical signals of the two excitation sensing sub-modules in each set to eliminate the excitation signal information in the output electrical signal, thereby obtaining partial information of the external current signal. By integrating the partial information corresponding to the at least two sets of excitation sensing sub-modules, the complete information of the external current signal can be obtained.

[0062] Continue with Figure 2 For example, Figure 2 The output electrical signals from the four excitation sensing submodules to the signal processing module 130 are independent of each other, such as... Figure 3 As shown. In Figure 3 In the example, the output electrical signals are divided into two groups: output electrical signals 1 and 2 form one group, and output electrical signals 3 and 4 form another group. Each group of output electrical signals is coupled and processed by the signal processing module 130 to filter out the excitation signal and obtain part of the information of an external current signal.

[0063] However, since each set of output electrical signals has a half-cycle of fluxgate-free signal, information about the external current signal cannot be detected during this period. To address this, at least two sets of excitation sensing submodules can be configured to obtain at least two sets of output electrical signals. These at least two sets of output electrical signals have a phase difference, resulting in different fluxgate-free signal times for the output electrical signals from different sets of excitation sensing submodules. Although the output electrical signal from a single set of excitation sensing submodules can only provide partial information about the external current signal, integrating multiple partial pieces of information can yield complete information about the external current signal, thus avoiding the missed detection of the external current signal during the fluxgate-free signal period.

[0064] For example, Figure 3In the output electrical signals shown, the phase difference between the two groups of output electrical signals is 90°, and the two groups of excitation induction sub-modules generate fluxgate signals at different time periods, so that the four output electrical signals coupled by the signal processing module can directly represent the change of the external current signal in the entire measurement period.

[0065] It should be noted that the waveform of the excitation signal or the output electrical signal is not limited to Figure 3 The waveform shown, for example, can be triangular, arc-shaped or other waveforms. The excitation signals obtained by different groups of excitation induction sub-modules are not limited to 90°, and can also be coupled at 45°, 60° or other degrees. In some embodiments, the output electrical signals obtained by different excitation induction sub-modules can also have different waveforms, for example, the output electrical signal obtained by one group of excitation induction sub-modules is a triangular wave, and the output electrical signal obtained by another group of excitation induction sub-modules is a sinusoidal wave, etc.

[0066] In addition, although Figure 2 and Figure 3 four excitation induction sub-modules are described, the number of excitation induction sub-modules is not limited to four, for example, it can be six, eight or even more. Exemplarily, since the excitation induction sub-modules are grouped two by two, the number of excitation induction sub-modules is an even number not less than 4.

[0067] The frequency of the excitation signal of the conventional fluxgate current detection device is orders of magnitude higher than the frequency of the external current signal, so that the information of the external current signal can be detected, while the excitation induction module of the embodiment of the present application directly represents the external current signal by using the dual coupling of magnetic field and circuit, so that the frequency of the excitation signal can be less than or equal to the frequency of the external current signal, and the frequency of the excitation signal can be the frequency of the power frequency signal or even lower, effectively reducing the loss of the detection device and greatly improving the frequency range of the measurable external current signal. The frequency of the excitation signal is not limited to the frequency of the power frequency signal, and can be 1 Hz, 10 Hz or any other frequency; and the frequency of the excitation signal can also be greater than the frequency of the external current signal.

[0068] Since the excitation magnetic core of the embodiment of the present application does not require a high excitation frequency, the material requirement for the excitation magnetic core is low, so that the excitation magnetic core is not limited to using expensive materials with high magnetic permeability and easy saturation containing nickel, but can use ferrite, silicon steel and other cheaper magnetic core materials to manufacture the excitation magnetic core, thereby reducing the cost and improving the production consistency of the wide bandwidth current detection device.

[0069] Based on the above description, the fluxgate current detection device of the embodiment of the present application improves the measurable frequency range, reduces the frequency of the excitation signal, and has a lower requirement for the material of the excitation magnetic core.

[0070] The following will be described with reference to Figure 4In another aspect, the present application provides a magnetic flux gate current detection method, comprising the following steps:

[0071] In step S410, the control power excitation module generates an excitation signal and outputs the excitation signal to the excitation induction module to make the excitation induction module generate a periodic magnetic signal, wherein the excitation induction module comprises at least two excitation induction sub-modules, each of the excitation induction sub-modules comprises an excitation magnetic core and a winding around the excitation magnetic core, and the excitation signals obtained by the at least two excitation induction sub-modules have a phase difference;

[0072] In step S420, the excitation induction module couples the to-be-detected magnetic signal generated by the external current signal and the periodic magnetic signal to generate an output electric signal containing information of the external current signal;

[0073] In step S430, the information of the external current signal is obtained according to the output electric signals output by the at least two excitation induction sub-modules, and the information of the external current signal is output.

[0074] In one embodiment, the amplitudes and / or frequencies of the excitation signals received by different excitation induction sub-modules are equal.

[0075] In some embodiments, the excitation induction module comprises at least two groups of excitation induction sub-modules, each group of excitation induction sub-modules comprises two excitation induction sub-modules, and the directions of the excitation signals obtained by the two excitation induction sub-modules in the same group are opposite. By coupling the output electric signals output by the two excitation induction sub-modules in each group, the information of the excitation signal in the output electric signal can be eliminated, and part of the information of the external current signal can be obtained. By integrating the part of information corresponding to the at least two groups of excitation induction sub-modules, the complete information of the external current signal can be obtained.

[0076] In some embodiments, the excitation induction module comprises two groups of excitation induction sub-modules, and the phase difference of the excitation signals obtained by the two groups of excitation induction sub-modules is 90°. Of course, the phase difference of the excitation signals obtained by different groups of excitation induction sub-modules can also be 45°, 60° or other degrees.

[0077] In some embodiments, the frequency of the excitation signal is less than or equal to the frequency of the external current signal. Of course, the frequency of the excitation signal can also be greater than the frequency of the external current signal.

[0078] The magnetic flux gate current detection method of the present application can be used in the magnetic flux gate current detection device as shown in the following figure: Figure 1The described fluxgate current detection device implementation, with reference to the foregoing, is not repeated here. The fluxgate current detection method of the embodiments of the present application improves the measurable frequency range, reduces the frequency of the excitation signal, and has lower requirements for the material of the excitation magnetic core.

[0079] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0080] Similarly, it is to be understood that the embodiments of the present application can be used in the exact form disclosed herein, or with minor modifications, and the embodiments of the present application are not limited to the specific embodiments described herein. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0081] Those skilled in the art will appreciate that all features described herein (including all accompanying claims, abstract and drawings), and steps or elements of any method or process so described, can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Each feature disclosed in this specification, (including any accompanying claims, abstract and drawings) can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

[0082] Furthermore, those skilled in the art will recognize that references in the specification to "one embodiment", "an embodiment", "an example embodiment", mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily referring to a single, "one embodiment".

[0083] It should be noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present application. While the application has been described with reference to preferred embodiments and illustrative examples, the words which have been used herein are words of description, and thus are used in a descriptive sense and not restrictive. In this detailed description, numerous specific details have been set forth in order to provide a thorough understanding of the application. However, it will be apparent to one skilled in the art that the application can be practiced without the specific details. In other instances, well-known methods have not been described in detail in order not to unnecessarily overshadow an aspect of the present application. Accordingly, the scope of the present application is defined by the appended claims.

[0084] The above description is only specific embodiments of the present application or the description of specific embodiments, the protection scope of the present application is not limited to this, any skilled in the art within the scope of the present application disclosed technology, can easily think of changes or replacement, should be covered in the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A fluxgate current sensing device, characterized by, The magnetic flux gate current detection device comprises: A power excitation module connected to the excitation induction module, configured to generate an excitation signal to cause the excitation induction module to generate a periodic magnetic signal, wherein the excitation signal is a signal with fixed frequency and phase, and the frequency of the excitation signal is less than or equal to the frequency of the external current signal; The excitation induction module comprises at least four excitation induction sub-modules, each of which is independent of the others, and each excitation induction sub-module comprises an excitation magnetic core and a winding around the excitation magnetic core, and the time period lengths of the excitation signals obtained by at least two excitation induction sub-modules are equal, and the start time or end time of the period is different; The at least four excitation induction sub-modules are divided into at least two groups of excitation induction sub-modules, each group of excitation induction sub-modules comprises two excitation induction sub-modules, and the directions of the excitation signals obtained by the two excitation induction sub-modules in the same group are opposite, and there is a phase difference between the excitation signals obtained by the excitation induction sub-modules in different groups; The excitation induction module is further configured to couple the to-be-detected magnetic signal generated by the external current signal and the periodic magnetic signal to generate an output electrical signal containing information of the external current signal; the at least two groups of excitation induction sub-modules output at least two groups of output electrical signals, and there is a phase difference between the at least two groups of output electrical signals, so that the output electrical signals output by the excitation induction sub-modules in different groups are different in time without a magnetic flux gate signal; A signal processing module connected to the excitation induction module, configured to obtain information of the external current signal according to the output electrical signals output by the at least two groups of excitation induction sub-modules, and output the information of the external current signal, comprising: coupling the output electrical signals output by the two excitation induction sub-modules in each group to eliminate the information of the excitation signal in the output electrical signals and obtain partial information of the external current signal, the partial information being information corresponding to a part of time periods with a magnetic flux gate signal; and integrating the partial information corresponding to the at least two groups of excitation induction sub-modules to obtain complete information of the external current signal.

2. The fluxgate current sensing device of claim 1, wherein, Further comprising a magnetic concentration module configured to induce the external current signal to generate the to-be-detected magnetic signal.

3. The fluxgate current sensing device of claim 1, wherein, The amplitudes and / or frequencies of the excitation signals received by different excitation induction sub-modules are equal.

4. The fluxgate current sensing device of claim 1, wherein, The excitation induction module comprises two groups of excitation induction sub-modules, and the phase difference between the excitation signals obtained by the two groups of excitation induction sub-modules is 90°.

5. The fluxgate current sensing device of claim 1, wherein, The excitation magnetic cores of the at least two excitation induction sub-modules are of the same size.

6. The fluxgate current sensing device of claim 1, wherein, The excitation magnetic cores of the at least two excitation induction sub-modules are arranged side by side.

7. The fluxgate current sensing device of claim 1, wherein, The magnetic core is a closed-loop magnetic core or a non-closed-loop magnetic core.

8. A fluxgate current sensing method, characterized by, The method comprises: The control power excitation module generates an excitation signal, wherein the excitation signal is a signal with fixed frequency and phase, the frequency of the excitation signal is less than or equal to the frequency of the external current signal, and the excitation signal is output to the excitation induction module to make the excitation induction module generate a periodic magnetic signal, wherein the excitation induction module includes at least four excitation induction sub-modules, each of the excitation induction sub-modules is independent of each other, each of the excitation induction sub-modules includes an excitation magnetic core and a winding around the excitation magnetic core, the time period length of the excitation signals obtained by the at least four excitation induction sub-modules is equal, and the cycle start time or cycle end time is different; the at least four excitation induction sub-modules are divided into at least two groups of excitation induction sub-modules, each group of excitation induction sub-modules includes two excitation induction sub-modules, the directions of the excitation signals obtained by the two excitation induction sub-modules in the same group are opposite, and the excitation signals obtained by the excitation induction sub-modules in different groups have a phase difference; The excitation induction module couples the to-be-measured magnetic signal generated by the external current signal and the periodic magnetic signal to generate an output electric signal containing information of the external current signal; the at least two groups of excitation induction sub-modules output at least two groups of output electric signals, and the at least two groups of output electric signals have a phase difference, so that the output electric signals output by the excitation induction sub-modules in different groups have different times without magnetic flux gate signals; According to the output electric signals output by the at least two groups of excitation induction sub-modules, the information of the external current signal is obtained, and the information of the external current signal is output, including: coupling the output electric signals output by the two excitation induction sub-modules in each group to eliminate the information of the excitation signal in the output electric signal and obtain partial information of the external current signal, the partial information being information corresponding to a part of time periods with magnetic flux gate signals; integrating the partial information corresponding to the at least two groups of excitation induction sub-modules to obtain complete information of the external current signal.

9. The fluxgate current sensing method of claim 8 wherein, The amplitudes and / or frequencies of the excitation signals received by different excitation induction sub-modules are equal.

10. The fluxgate current sensing method of claim 8, wherein, The excitation induction module includes two groups of excitation induction sub-modules, and the phase difference of the excitation signals obtained by the two groups of excitation induction sub-modules is 90°.

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