Magnetic probes, fluxgate current sensors and electronics
By setting the second winding inside the core in the magnetic probe of the flux gate current sensor, the problem of winding difficulty of the excitation winding through the small cylinder is solved, and lower production difficulty and higher measurement accuracy are achieved.
Patent Information
- Application Number
- CN202420388451.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-02-28
AI Technical Summary
In the magnetic probes of the existing orthogonal flux gate current sensor, the excitation winding needs to pass through an extremely small cylinder, making it difficult to wind.
A magnetic probe for a flux gate current sensor is designed, including a magnetic core, a first winding and a second winding, wherein the second winding is all arranged inside the magnetic core, the winding line extends in the extension direction of the magnetic core, and the first winding is wound on the outer surface of the magnetic core in the extension direction of the magnetic core.
By placing the second winding inside the magnetic core, the difficulty of winding that needs to pass through the small cylinder is avoided, production difficulty and cost are reduced, and product consistency and measurement accuracy are improved.
Smart Images
Figure CN222704653U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electricity, and more specifically to a magnetic probe, a fluxgate current sensor and an electronic device. Background Art
[0002] Fluxgate current sensor technology is a current detection method that modulates the external magnetic field signal and the internal excitation signal, and then demodulates the external magnetic field signal by the signal processing circuit. After the modulation and demodulation process, the fluxgate current sensor can not only detect the AC information of the external current like a traditional current transformer, but also detect the DC information of the external current. According to the different vector directions of the internal excitation signal and the external magnetic field signal, the fluxgate can be divided into parallel fluxgate and orthogonal fluxgate.
[0003] In the magnetic probe of the orthogonal fluxgate current sensor in the related art, the magnetic core is a cylinder made of soft magnetic material, and two sets of mutually perpendicular coil windings are wound in the height direction and the annular direction respectively. The excitation winding in the height direction generates an alternating magnetic field in the annular direction of the magnetic core through the internal excitation signal. The alternating magnetic field is coupled with the magnetic field in the height direction of the magnetic core, and then an induced voltage is generated on the induction winding in the annular direction. After that, the external magnetic field information is demodulated through signal processing methods such as circuit phase-sensitive detection or second harmonic detection, and then the external current information is detected. However, the excitation winding needs to pass through a very small cylinder, which makes winding difficult. Utility Model Content
[0004] The present utility model is proposed to solve at least one of the above problems. According to the first aspect of the present application, a magnetic probe of a fluxgate current sensor is provided, the magnetic probe comprising: a magnetic core, a first winding and a second winding; wherein the first winding is wound on the outer surface of the magnetic core along the extension direction of the magnetic core; the second winding is arranged inside the magnetic core; and the winding wire of the second winding extends along the extension direction of the magnetic core; wherein one of the first winding and the second winding is an excitation winding, and the other winding is an induction winding.
[0005] In one embodiment of the present application, the shape of the magnetic core is ring-shaped; and the winding wire of the second winding is wound inside the magnetic core along the circumference of the magnetic core.
[0006] In one embodiment of the present application, the ring shape is a circular ring, an elliptical ring or a polygonal ring.
[0007] In one embodiment of the present application, the shape of the magnetic core is straight or curved; the magnetic core has a first end and a second end in the extension direction of the magnetic core; wherein the winding wire of the second winding is bent at the first end and extends toward the second end, and the winding wire of the second winding is bent at the second end and extends toward the first end.
[0008] In one embodiment of the present application, on the same cross section perpendicular to the extension direction of the magnetic core, the winding wire of the first winding is perpendicular to the extension direction of the magnetic core, and the winding wire of the second winding is perpendicular to the extension direction of the magnetic core.
[0009] In one embodiment of the present application, the material of the magnetic core is an amorphous nanocrystalline soft magnetic material or a high magnetic permeability material.
[0010] In one embodiment of the present application, the magnetic core is a pressed magnetic core, and the second winding is pressed inside the magnetic core.
[0011] In one embodiment of the present application, the first winding is the excitation winding, and the second winding is the induction winding; the magnetic permeability of the magnetic core in the extension direction of the magnetic core is greater than the magnetic permeability perpendicular to the extension direction of the magnetic core.
[0012] In one embodiment of the present application, the first winding is the induction winding, and the second winding is the excitation winding; the magnetic permeability of the magnetic core in the extension direction of the magnetic core is smaller than the magnetic permeability perpendicular to the extension direction of the magnetic core.
[0013] According to the second aspect of the present application, a fluxgate current sensor is also provided, which includes: an excitation signal source, a signal collector, a signal processor, and a magnetic probe of any one of the above-mentioned fluxgate current sensors; wherein the excitation signal source is connected to the excitation winding, and the excitation signal source is used to input an excitation signal to the excitation winding; the signal collector is connected to the induction winding, and the signal collector is used to collect an induction signal on the induction winding; the signal processor is connected to the signal collector, and the signal processor is used to receive the induction signal and obtain current information on the conductor to be measured based on the induction signal.
[0014] According to a third aspect of the present application, an electronic device is also provided, the electronic device comprising: any one of the fluxgate current sensors described above.
[0015] According to the magnetic probe, fluxgate current sensor and electronic device provided by the embodiment of the present application, a magnetic core, a first winding and a second winding are provided, one of the first winding and the second winding is used as an excitation winding, and the other winding is used as an induction winding; the first winding is wound on the outer surface of the magnetic core along the extension direction of the magnetic core; the second winding is provided inside the magnetic core, and the winding wire of the second winding extends along the extension direction of the magnetic core. Compared with the related art, the present application sets the second winding entirely inside the magnetic core, so that the second winding does not need to pass through a very small cylinder, reducing the difficulty of winding. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 It is a schematic diagram of an orthogonal fluxgate magnetic probe in the related art;
[0018] Figure 2 It is a schematic diagram of another orthogonal fluxgate magnetic probe in the related art;
[0019] Figure 3 This is an appearance structure diagram of a magnetic probe of a fluxgate current sensor according to an embodiment of the utility model;
[0020] Figure 4 for Figure 3 A schematic diagram of the partial internal structure of the magnetic probe of the fluxgate current sensor is shown;
[0021] Figure 5 This is a working principle diagram of a fluxgate current sensor according to an embodiment of the present utility model.
[0022] Reference numerals:
[0023] 10-magnetic core 20-first winding 30-second winding DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the utility model more obvious, the exemplary embodiments according to the utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments of the utility model, and it should be understood that the utility model is not limited to the exemplary embodiments described here. Based on the embodiments of the utility model described in the utility model, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the utility model.
[0025] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.
[0026] It should be understood that the utility model can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
[0027] In order to thoroughly understand the present invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.
[0028] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0029] Fluxgate current sensor technology is a current detection method that modulates the external magnetic field signal and the internal excitation signal, and then demodulates the external magnetic field signal by the signal processing circuit. After the modulation and demodulation process, the fluxgate current sensor can not only detect the AC information of the external current like a traditional current transformer, but also detect the DC information of the external current. According to the different vector directions of the internal excitation signal and the external magnetic field signal, the fluxgate can be divided into parallel fluxgate and orthogonal fluxgate. Due to the convenience of production, the mainstream product on the market is the parallel fluxgate.
[0030] The orthogonal fluxgate was invented in the 1960s, but due to problems such as demagnetization factor and magnetic noise, it has been ignored and its development has stagnated for many years. In recent years, with the emergence of high permeability materials, especially the increasingly mature preparation technology of amorphous wires, and the rapid development of signal processing integrated circuit technology, the orthogonal fluxgate has regained attention in the past 15 years. Because the orthogonal fluxgate has the advantages of small size, low noise, small nonlinear error and large range, it has been used in the field of weak magnetic field detection, especially in the micro field.
[0031] There are two main types of orthogonal fluxgate sensors in related technologies based on the type of magnetic probe:
[0032] 1. The first type is the traditional type of orthogonal fluxgate magnetic probe, such as Figure 1As shown. The magnetic core is a cylinder made of soft magnetic material, with two sets of mutually perpendicular coil windings wound in the height direction and the annular direction respectively. The excitation winding in the height direction generates an alternating magnetic field in the annular direction of the magnetic core through the internal excitation signal. The alternating magnetic field is coupled with the magnetic field in the height direction of the magnetic core, and then an induced voltage is generated on the induction winding in the annular direction. After that, the external magnetic field information is demodulated through signal processing methods such as circuit phase-sensitive detection or second harmonic detection, and then the external current information is detected. However, the excitation winding needs to pass through a very small cylinder, which makes winding difficult.
[0033] 2. The second type is to use the magnetic core as both the excitation winding and the magnetic core, which can pass current and modulate the magnetic field. Usually, amorphous wire or amorphous strip sheet is used, such as Figure 2 The magnetic probe of the orthogonal fluxgate sensor using amorphous strip sheets has a circular core distribution method so that the length of the core can be adjusted by increasing or decreasing the length and number of straight line segments. If the core part uses amorphous wire, it is more convenient to bend and adjust the total length.
[0034] The design method of the magnetic probe of the orthogonal fluxgate sensor shown above has the following disadvantages:
[0035] (1) The consistency is difficult to control, especially in the second method mentioned above, the position of the magnetic core has a greater impact on the finished product. Whether it is the position of the wire or the thin strip, it is difficult to control, and the consistency of the finished product cannot be guaranteed;
[0036] (2) The production is difficult. The first method mentioned above is difficult to wind, especially the excitation winding needs to pass through a very small cylinder. It can basically only be produced by hand, with low efficiency and poor consistency. The second method mentioned above is very difficult to adjust and place the structure of the magnetic core, and the production efficiency is low;
[0037] (3) The long strip core structure has a large demagnetization factor, which varies with shape and size, affecting the effective magnetic field strength and magnetic induction strength of the core and making engineering design calculations extremely difficult;
[0038] (4) The detection frequency bandwidth is low, especially the second method mentioned above, which uses the GMI effect of the magnetic core. Too high a frequency will greatly increase the processing difficulty of the back-end circuit, thereby affecting the accuracy;
[0039] (5) If you want to increase the detection range, the relevant methods, whether adjusting the performance of the magnetic module or the circuit performance, will reduce the detection bandwidth to a certain extent;
[0040] At least some of the above-mentioned technical problems existing in the related technologies can be solved by the technical solutions shown in some embodiments of the present application.
[0041] refer to Figure 3 and Figure 4 An embodiment of the present application provides a magnetic probe of a fluxgate current sensor, the magnetic probe comprising: a magnetic core 10, a first winding 20 and a second winding 30; wherein the first winding 20 is wound on the outer surface of the magnetic core 10 along the extension direction of the magnetic core 10; the second winding 30 is arranged inside the magnetic core 10; and the winding wire of the second winding 30 extends along the extension direction of the magnetic core 10; wherein one of the first winding 20 and the second winding 30 is an excitation winding, and the other winding is an induction winding.
[0042] In the above scheme, by setting the magnetic core 10, the first winding 20 and the second winding 30, one of the first winding 20 and the second winding 30 is used as the excitation winding, and the other winding is used as the induction winding; the first winding 20 is wound on the outer surface of the magnetic core 10 along the extension direction of the magnetic core 10; the second winding 30 is arranged inside the magnetic core 10, and the winding wire of the second winding 30 extends along the extension direction of the magnetic core 10. Compared with the related art, the embodiment of the present application sets the second winding 30 entirely inside the magnetic core 10, so that the second winding 30 does not need to pass through a very small cylinder, reducing the difficulty of winding. The above structures are described in detail below in conjunction with the accompanying drawings.
[0043] When the magnetic core 10 is provided, any shape of the magnetic core 10 may be used. Figure 3 , the shape of the magnetic core 10 can be annular, that is, the shape of the magnetic core 10 is a closed ring. By adopting the annular magnetic core 10, the demagnetization factor is zero, the adverse effects of the demagnetization factor can be avoided, and the computability and designability of the product can be improved. Specifically, the ring can be such as but not limited to a circular ring, an elliptical ring or a polygonal ring. The polygonal ring can specifically be a quadrilateral ring, a hexagonal ring, etc. Of course, in other embodiments, the shape of the magnetic core 10 can also be a non-closed shape, that is, the shape of the magnetic core 10 is a non-closed line shape. For example, the shape of the magnetic core 10 can be such as but not limited to a straight line or a curved line. The straight line shape can be a column, etc. The curved line shape can be such as but not limited to an arc. The arc shape can specifically be a superior arc shape, an inferior arc shape, a semicircle, etc. For example, refer to Figure 4 , the shape of the magnetic core 10 is a minor arc shape.
[0044] refer to Figure 3 and Figure 4, a winding is arranged on the inner and outer surfaces of the magnetic core 10, respectively, wherein the first winding 20 is arranged on the outer surface of the magnetic core 10, and is wound on the outer surface of the magnetic core 10 along the extension direction of the magnetic core 10. The first winding 20 is formed by a plurality of winding wires formed by winding winding wires. It should be explained that the extension direction of the magnetic core 10 refers to: the extension direction of the central axis inside the magnetic core 10. For example, when the shape of the magnetic core 10 is a straight line, the extension direction of the magnetic core 10 is the length direction of the straight line. When the magnetic core 10 is non-linear, the extension direction of the magnetic core 10 is specifically related to the position of the magnetic core 10. For example, at the middle position of the non-linear magnetic core 10, the extension direction of the magnetic core 10 refers to the tangent direction at this position. The first winding 20 is formed by winding a plurality of winding wires along the extension direction of the magnetic core 10, so that each winding wire on the first winding 20 is roughly or substantially perpendicular to the extension direction of the magnetic core 10 in a cross section perpendicular to the extension direction of the magnetic core 10.
[0045] refer to Figure 4 , the second winding 30 is arranged inside the magnetic core 10. Specifically, the second winding 30 is completely located inside the magnetic core 10. And the winding wire of the second winding 30 extends along the extension direction of the magnetic core 10. The second winding 30 is formed by a plurality of winding wires wound by winding wires, that is, the second winding 30 is formed by winding a plurality of winding wires. However, the winding method of the winding wire of the second winding 30 in the present application is not the same as that in the prior art. Figure 1 The winding method shown in FIG. Instead, all the winding wires of the second winding 30 are arranged inside the magnetic core 10, so that the second winding 30 does not need to pass through a very small cylinder, which reduces the difficulty of winding. And because the winding wires of the second winding 30 extend along the extension direction of the magnetic core 10, and the winding wires of the first winding 20 are roughly or substantially perpendicular to the extension direction of the magnetic core 10, the winding wires of the second winding 30 and the winding wires of the first winding 20 can be roughly or substantially perpendicular, thereby forming a magnetic probe of an orthogonal fluxgate sensor.
[0046] When determining the type of the first winding 20 and the second winding 30, it is specifically related to the type of signal passed or the object connected. Specifically, one of the first winding 20 and the second winding 30 is an excitation winding, and the other winding is an induction winding. For example, the first winding 20 can be an excitation winding, and the second winding 30 can be an induction winding. Or, the first winding 20 is an induction winding, and the second winding 30 is an excitation winding. The winding of the first winding 20 and the second winding 30 that is connected to the excitation signal source is the excitation winding. The winding of the first winding 20 and the second winding 30 that is connected to the signal collector is the induction winding.
[0047] It can be seen from the above examples that the above examples of the present application provide a magnetic core 10, a first winding 20 and a second winding 30, one of the first winding 20 and the second winding 30 is used as an excitation winding, and the other winding is used as an induction winding; the first winding 20 is wound on the outer surface of the magnetic core 10 along the extension direction of the magnetic core 10; the second winding 30 is provided inside the magnetic core 10, and the winding wire of the second winding 30 extends along the extension direction of the magnetic core 10. Compared with the related art, the embodiment of the present application sets the second winding 30 entirely inside the magnetic core 10, so that the second winding 30 does not need to pass through a very small cylinder, reducing the difficulty of winding.
[0048] Exemplary, reference Figure 3 and Figure 4 When the shape of the magnetic core 10 is annular, the winding wire of the second winding 30 can be wound inside the magnetic core 10 along the circumference of the magnetic core 10. For example, referring to Figure 3 and Figure 4 , when the shape of the magnetic core 10 is annular, each turn of the winding wire of the second winding 30 is also arranged in the inner part of the magnetic core 10 in an annular winding manner, that is, each turn of the winding wire in the second winding 30 is just wound in the inner part of the magnetic core 10 along the circumference of the annular magnetic core 10. For example, when the shape of the magnetic core 10 is elliptical, each turn of the winding wire of the second winding 30 is also arranged in the inner part of the magnetic core 10 in an elliptical winding manner, that is, each turn of the winding wire in the second winding 30 is just wound in the inner part of the magnetic core 10 along the circumference of the elliptical magnetic core 10.
[0049] Exemplarily, when the shape of the magnetic core 10 is a straight line or a curve, the magnetic core 10 has a first end and a second end in the extension direction of the magnetic core 10. The winding wire of the second winding 30 extends to the second end after being bent at the first end, and the winding wire of the second winding 30 extends to the first end after being bent at the second end. That is, after the winding wire of the second winding 30 extends to the first end of the magnetic core 10, it is bent; after the winding wire of the second winding 30 extends to the second end of the magnetic core 10, it is bent and then extends to the first end of the magnetic core 10. As a result, the second winding 30 does not need to be wound through the through hole of the magnetic core 10 as shown in the prior art, thereby simplifying the difficulty of winding the second winding 30.
[0050] Exemplary, reference Figure 3 and Figure 4, on the same cross section perpendicular to the extension direction of the magnetic core 10, the winding wire of the first winding 20 is perpendicular to the extension direction of the magnetic core 10, and the winding wire of the second winding 30 is perpendicular to the extension direction of the magnetic core 10, so that at a certain position of the winding wire of the second winding 30, there is a winding wire of the first winding 20 arranged vertically, thereby improving the orthogonal effect of the two windings in the magnetic probe of the fluxgate sensor. That is, by making the winding direction of the excitation winding perpendicular to the winding direction of the induction winding, the magnetic fields generated by the excitation winding and the induction winding on the magnetic core 10 are orthogonal to each other. In addition, it can effectively avoid the noise of the excitation winding from being directly coupled to the induction winding, thereby improving the measurement accuracy of the fluxgate sensor. Exemplarily, the above-mentioned second winding 30 can be an excitation winding, and the above-mentioned first winding 20 can be an induction winding. By using the magnetic core 10 to wrap the second winding 30 as the excitation winding therein, the disturbance noise generated by the incomplete orthogonality of the excitation winding and the induction winding is avoided, and the measurement accuracy of the fluxgate sensor is improved.
[0051] Exemplarily, the material of the magnetic core 10 can be an amorphous nanocrystalline soft magnetic material or a high magnetic permeability material. The high magnetic permeability material specifically refers to: a ferromagnetic material with a magnetic permeability of about 100 or more. For example, the high magnetic permeability material can be, for example, but not limited to, FeNi alloy. The amorphous nanocrystalline soft magnetic material is an isotropic material such as an amorphous magnetic powder material.
[0052] Exemplarily, the magnetic core 10 may be a pressed magnetic core 10, and the second winding 30 is pressed inside the magnetic core 10. In a specific pressing process, the magnetic core 10 may be formed by pressing a magnetic powder material. And the second winding 30 is directly pressed inside the magnetic core 10 during the pressing process of the magnetic core 10, so that the second winding 30 and the magnetic core 10 are pressed into an integrated structure. In other embodiments, the magnetic core 10 may also be a magnetic core 10 formed by processes such as but not limited to casting, melting, forging, etc., and the second winding 30 is directly fixed inside the magnetic core 10 during the manufacturing process of the magnetic core 10. Of course, in other embodiments, a hollow chamber extending along the extension direction of the magnetic core 10 may also be provided inside the magnetic core 10, and the second winding 30 may be provided in the hollow chamber along the extension direction of the magnetic core 10.
[0053] For example, the magnetic permeability of the magnetic core 10 in different directions may be processed to increase the excitation frequency of the fluxgate sensor to increase the operating frequency and expand the measurement range of the fluxgate sensor.
[0054] Specifically, when the first winding 20 is an excitation winding and the second winding 30 is an induction winding, the magnetic permeability of the magnetic core 10 in the extension direction of the magnetic core 10 can be made greater than the magnetic permeability perpendicular to the extension direction of the magnetic core 10. Thus, the magnetic permeability of the magnetic core 10 in the direction of the magnetic field generated by the excitation winding is greater than the magnetic permeability of the magnetic core 10 in the direction of the magnetic field generated by the induction winding, thereby increasing the excitation frequency of the fluxgate sensor to increase the operating frequency, and also expanding the measurement range, test range and test bandwidth of the fluxgate sensor.
[0055] Exemplarily, when the first winding 20 is an induction winding and the second winding 30 is an excitation winding, the magnetic permeability of the magnetic core 10 in the extension direction of the magnetic core 10 can be made smaller than the magnetic permeability perpendicular to the extension direction of the magnetic core 10. Thus, the magnetic permeability of the magnetic core 10 in the direction of the magnetic field generated by the excitation winding is greater than the magnetic permeability of the magnetic core 10 in the direction of the magnetic field generated by the induction winding, thereby increasing the excitation frequency of the fluxgate sensor to increase the operating frequency, and also expanding the measurement range, test range and test bandwidth of the fluxgate sensor.
[0056] The principle of increasing the working frequency and the measuring range is as follows: the magnetic core 10 is associated in two directions perpendicular to each other. By processing the magnetic core 10 to a certain extent, the magnetic core 10 is more easily magnetized in the direction of the magnetic field generated by the excitation coil, so that the saturation magnetic field intensity in the direction of the magnetic field generated by the excitation coil is lower, thereby increasing the excitation frequency. Simultaneously, the magnetic core 10 will not be easily magnetized in the direction of the magnetic field generated by the induction coil, that is, the saturation magnetic field intensity in the direction of the magnetic field generated by the induction coil is lower, so that a larger range can be detected.
[0057] For example, a compensation winding may be wound around the outer surface of the magnetic core 10 to perform closed measurement and improve measurement accuracy. Of course, in scenarios where accuracy requirements are not high, the compensation winding may not be provided to perform open-loop or pure analog measurement.
[0058] In each of the above-mentioned embodiments, a magnetic core 10, a first winding 20 and a second winding 30 are provided, one of the first winding 20 and the second winding 30 is used as an excitation winding, and the other winding is used as an induction winding; the first winding 20 is wound on the surface of the magnetic core 10 along the extension direction of the magnetic core 10; the second winding 30 is provided inside the magnetic core 10, and the winding wire of the second winding 30 extends along the extension direction of the magnetic core 10. Compared with the related art, the embodiment of the present application sets the second winding 30 entirely inside the magnetic core 10, so that the second winding 30 does not need to pass through a very small cylinder, reducing the difficulty of winding. And the fluxgate sensor shown above, due to the structural improvement, can simplify the manufacturing difficulty, improve the production efficiency and product consistency, and greatly reduce the production cost and production difficulty of the product. The fluxgate sensor shown in some of the above-mentioned embodiments can replace the parallel fluxgate sensor to a certain extent, so that the fluxgate sensor is no longer limited to the application of microelectronic products.
[0059] Compared with the prior art, some embodiments of the present application can reduce the disturbance noise in the existing orthogonal fluxgate sensor; solve the influence of the demagnetization coefficient of the magnetic probe in the existing orthogonal fluxgate sensor; improve the detection frequency bandwidth of the existing orthogonal fluxgate sensor and expand the measurement range; and improve the production efficiency and consistency of the orthogonal fluxgate sensor.
[0060] Furthermore, the present application embodiment also provides a fluxgate current sensor, referring to Figure 3 , Figure 4 and Figure 5 The fluxgate current sensor includes: an excitation signal source, a signal collector, a signal processor, and a magnetic probe of any one of the above fluxgate current sensors; wherein the excitation signal source is connected to the excitation winding, and the excitation signal source is used to input the excitation signal to the excitation winding; the signal collector is connected to the induction winding, and the signal collector is used to collect the induction signal on the induction winding; the signal processor is connected to the signal collector, and the signal processor is used to receive the induction signal and obtain the current information on the conductor to be measured according to the induction signal.
[0061] When measuring the current on the conductor to be measured, the magnetic probe can be placed near the conductor to be measured. Figure 3 and Figure 4 When the shape of the magnetic core 10 is annular, the magnetic probe can be placed on the conductor to be measured, so that the external current on the conductor to be measured is coupled to the magnetic probe. In addition, an excitation signal can be input to the excitation winding through an excitation signal source. The induction signal is generated by the induction winding on the magnetic probe, and the induction signal on the induction winding is collected by the signal collector. Then, the signal processor processes it. Specifically, the analog-to-digital converter ( Figure 5The ADC in the figure represents analog-to-digital converter) first converts the sensing signal collected by the signal collector into a digital signal, which is then converted into a digital signal by the microprocessor in the signal processor ( Figure 5 The MCU in the sensor calculates and outputs a numerical signal or an analog signal. On the other hand, the MCU of the signal processor can also output a feedback signal compensation to keep the magnetic field of the magnetic probe in the sensing direction in a zero flux state, thereby improving the measurement accuracy of the fluxgate sensor.
[0062] Exemplarily, when the magnetic field direction of the induction winding and the magnetic field direction of the excitation winding are strictly orthogonal, and there is no external current signal to be measured, the induction signal is zero. During the time of zero magnetic flux, the induction signal is kept at zero, and at this time, the feedback signal is proportional to the value of the external signal, and the ratio between the feedback signal and the external signal is the number of turns of the compensation winding. Exemplarily, when the compensation winding and the induction winding share one winding, the ratio between the feedback signal and the external signal is the number of turns of the induction winding.
[0063] In the case of an external current signal, and when the system is open-loop (without compensation winding) with low accuracy requirements, the system output induction signal is approximately: U = a*S*N*N*I*d(H(t)2) / dt. Where a is a coefficient, S is the cross-section of the magnetic core 10 (relative to the cross-section of the induction winding), N is the number of turns of the induction winding, H(t) is the magnetic field strength of the excitation winding, and t is time. Further, it should be noted that the actual number of turns of the induction winding is not exactly equal to the schematic. Figure 3 and Figure 4 As shown, or more or less than shown Figure 3 and Figure 4 Number of turns shown.
[0064] In addition, the present application also provides an electronic device, referring to Figure 3 and Figure 4 , the electronic device includes: any one of the above fluxgate current sensors. The electronic device may be an electronic device applied to, for example, but not limited to, energy storage, photovoltaics, new energy, etc. Exemplarily, the electronic device may be an energy storage device, a photovoltaic power generation device, a power battery device, etc. Exemplarily, the electronic device may be, for example, but not limited to, a terminal device or a non-terminal device.
[0065] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.
Claims
1. A magnetic probe of a fluxgate current sensor, characterized in that: include: Magnetic core; A first winding, wound around the outer surface of the magnetic core along the extension direction of the magnetic core; A second winding is arranged inside the magnetic core; and a winding wire of the second winding extends along an extension direction of the magnetic core; Among them, one of the first winding and the second winding is an excitation winding, and the other winding is an induction winding.
2. The magnetic probe according to claim 1, characterized in that The shape of the magnetic core is annular; The winding wire of the second winding is wound inside the magnetic core along the circumference of the magnetic core.
3. The magnetic probe according to claim 2, characterized in that: The ring shape is a circular ring, an elliptical ring or a polygonal ring.
4. The magnetic probe according to claim 1, characterized in that: The shape of the magnetic core is a straight line or a curved line; The magnetic core has a first end and a second end in the extension direction of the magnetic core; wherein the winding wire of the second winding is bent at the first end and extends toward the second end, and the winding wire of the second winding is bent at the second end and extends toward the first end.
5. The magnetic probe according to any one of claims 1 to 4, characterized in that: On the same cross section perpendicular to the extension direction of the magnetic core, the winding wire of the first winding is perpendicular to the extension direction of the magnetic core, and the winding wire of the second winding is perpendicular to the extension direction of the magnetic core.
6. The magnetic probe according to claim 1, characterized in that: The material of the magnetic core is amorphous nanocrystalline soft magnetic material or high magnetic permeability material.
7. The magnetic probe according to claim 1, characterized in that: The magnetic core is a pressed magnetic core, and the second winding is pressed inside the magnetic core.
8. The magnetic probe according to claim 1, characterized in that: The first winding is the excitation winding, and the second winding is the induction winding; The magnetic permeability of the magnetic core in the extension direction of the magnetic core is greater than the magnetic permeability perpendicular to the extension direction of the magnetic core.
9. The magnetic probe according to claim 1, characterized in that: The first winding is the induction winding, and the second winding is the excitation winding; The magnetic permeability of the magnetic core in the extension direction of the magnetic core is smaller than the magnetic permeability perpendicular to the extension direction of the magnetic core.
10. A fluxgate current sensor, characterized in that: include: The magnetic probe of the fluxgate current sensor according to any one of claims 1 to 9; an excitation signal source, connected to the excitation winding, and used to input an excitation signal to the excitation winding; A signal collector, connected to the induction winding, and used to collect the induction signal on the induction winding; The signal processor is connected to the signal collector and is used to receive the sensing signal and obtain the current information on the conductor to be measured according to the sensing signal.
11. An electronic device, characterized in that: include: The fluxgate current sensor as claimed in claim 10.