Design system and design method of Hall current sensor magnetic core

Abstract

The invention discloses a design method of a magnetic core of a Hall current sensor and related equipment. The design method comprises the following steps: determining a reference magnetic flux density target value of the magnetic core in a saturation state; setting a plurality of key structure sizes of the magnetic core, wherein the key structure sizes at least comprise the air gap length, the air gap sectional area, and the horizontal distance and the vertical distance between the inner wall of the magnetic core and the conductor; and adjusting the size of the key structure through simulation analysis, so that the difference value between the reference magnetic flux density of the magnetic core and the reference magnetic flux density target value is smaller than a preset difference value when the preset highest working current is introduced into the conductor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of current sensors, and particularly relates to a design method of a Hall current sensor magnetic core, a design system of a Hall current sensor magnetic core, a magnetic core and a Hall current sensor. BACKGROUND

[0002] With the rapid development of the electric vehicle industry, the real-time detection accuracy and stability of three-phase current by the electric drive controller are put forward with higher requirements. The Hall current sensor becomes the core detection component in this scene due to the advantages of small size, wide dynamic range, small zero drift and the like. The structure size of the magnetic core directly affects the linearity and sensitivity of the sensor. In the related technology, the cost is high and the verification period is long through the way of manufacturing different size magnetic cores for physical testing. The magnetic performance is attenuated due to the processing stress of the magnetic core. The actual layout such as conductor bending also affects the magnetic flux density distribution, which further increases the design difficulty. Therefore, a precise and efficient Hall current sensor magnetic core design scheme is needed to solve the above problems. SUMMARY

[0003] The application aims to at least solve one of the technical problems in the prior art. To this end, the application provides a design method of a Hall current sensor magnetic core, which can solve the core problem of difficult accurate balance of linearity and sensitivity in related magnetic core design, avoid the difficulty of high cost and long verification period in the traditional physical test mode, adapt to the influence of magnetic performance caused by processing stress and conductor bending, and further realize the steady improvement of sensor full-range detection accuracy, thereby providing reliable support for efficient design of the Hall current sensor in high requirement scenes.

[0004] To achieve the above purpose, the first aspect of the application provides a design method of a Hall current sensor magnetic core, comprising the following steps: determining a reference magnetic flux density target value of the magnetic core in a saturated state; setting a plurality of key structure sizes of the magnetic core, the key structure sizes at least including a gap length, a gap cross-sectional area, a horizontal distance and a vertical distance between the inner wall of the magnetic core and the conductor; adjusting the key structure sizes through simulation analysis, so that the difference between the reference magnetic flux density of the magnetic core and the reference magnetic flux density target value is less than a preset difference when the conductor passes in a preset highest working current.

[0005] In some embodiments, the gap cross-sectional area is composed of the product of the gap width and the gap height; after determining the gap cross-sectional area, the inner ring size of the magnetic core is kept unchanged, and the outer ring size of the magnetic core is adjusted to adjust the gap width and / or the gap height.

[0006] In some embodiments, the reference magnetic flux density is reduced by increasing the gap length and / or increasing the gap cross-sectional area.

[0007] In some embodiments, the reference magnetic flux density is the magnetic flux density value at the midpoint of the intersection between the magnetic core symmetry plane and the inner hole surface of the magnetic core.

[0008] In some embodiments, when the conductor has a bend, the key structure size further includes the distance from the surface of the conductor bending section to the surface of the magnetic core; the method further includes: in response to the conductor bending towards the midpoint of the intersection between the magnetic core symmetry plane and the inner hole surface of the magnetic core, increasing the distance from the surface of the conductor bending section to the surface of the magnetic core.

[0009] In some embodiments, the method further includes: based on the ideal saturation magnetic flux density of the magnetic core material and the magnetic property attenuation caused by the processing stress, determining the reference magnetic flux density target value of the magnetic core in the saturation state through linearity analysis of the measured data of the physical sample of the magnetic core.

[0010] In some embodiments, the magnetic core material is oriented silicon steel.

[0011] According to the design method of the Hall current sensor magnetic core, first, the reference magnetic flux density target value of the magnetic core in the saturation state is determined; further, a plurality of key structure sizes of the magnetic core are set, and the key structure sizes at least include the air gap length, the air gap cross-sectional area, the horizontal distance and the vertical distance of the inner wall of the magnetic core and the conductor; finally, through simulation analysis, the key structure sizes are adjusted, so that the difference between the reference magnetic flux density of the magnetic core and the reference magnetic flux density target value is less than the preset difference when the conductor passes in the preset highest working current. Therefore, the core problem of difficult to accurately balance the linearity and sensitivity in the related magnetic core design can be solved, the difficulties of high cost and long verification period in the traditional physical test mode are avoided, the influence of the magnetic property caused by the processing stress and the conductor bending can be adapted, and the steady improvement of the full-range detection accuracy of the sensor is realized, thereby providing reliable support for the efficient design of the Hall current sensor in high requirement scenarios.

[0012] To achieve the above-mentioned purpose, the second aspect embodiment of the present application provides a design system of a Hall current sensor magnetic core, including the following steps: a determination module configured to determine the reference magnetic flux density target value of the magnetic core in the saturation state; a parameter setting module configured to set a plurality of key structure sizes of the magnetic core, and the key structure sizes at least include the air gap length, the air gap cross-sectional area, the horizontal distance and the vertical distance of the inner wall of the magnetic core and the conductor; a simulation module configured to adjust the key structure sizes of the linearity and sensitivity in the related magnetic core design through simulation analysis, so that the difference between the reference magnetic flux density of the linearity and sensitivity magnetic core in the related magnetic core design and the reference magnetic flux density target value of the linearity and sensitivity in the related magnetic core design is less than the preset difference when the conductor passes in the preset highest working current.

[0013] The design system of the Hall current sensor magnetic core according to the embodiment of the present application comprises the following steps: a determination module configured to determine a reference magnetic flux density target value of the magnetic core in a saturated state; a parameter setting module configured to set a plurality of key structure sizes of the magnetic core, wherein the key structure sizes related to linearity and sensitivity in the magnetic core design at least include a gap length, a gap cross-sectional area, a horizontal distance and a vertical distance between the inner wall of the magnetic core and the conductor; and a simulation module configured to adjust the key structure sizes related to linearity and sensitivity in the magnetic core design through simulation analysis, so that when a preset highest working current is passed through the conductor, the difference between the reference magnetic flux density of the magnetic core related to linearity and sensitivity and the reference magnetic flux density target value of the magnetic core related to linearity and sensitivity in the magnetic core design is less than a preset difference value. Thus, the present application can solve the core problem that the linearity and sensitivity in the magnetic core design are difficult to balance accurately, avoid the difficulty of high cost and long verification period in the traditional physical test mode, can adapt to the influence of the magnetic performance caused by the machining stress and the conductor bending, and further realize the steady improvement of the detection accuracy of the sensor in the full range, thereby providing reliable support for the efficient design of the Hall current sensor in the high requirement scene.

[0014] To achieve the above-mentioned purpose, the third aspect embodiment of the present application provides a magnetic core, the structure size of which is obtained by the design method of the Hall current sensor magnetic core according to any one of the above-mentioned embodiments.

[0015] According to the magnetic core of the embodiment of the present application, by executing the design method of the Hall current sensor magnetic core, the core problem that the linearity and sensitivity in the magnetic core design are difficult to balance accurately can be solved, the difficulty of high cost and long verification period in the traditional physical test mode is avoided, the influence of the magnetic performance caused by the machining stress and the conductor bending can be adapted, and the steady improvement of the detection accuracy of the sensor in the full range is realized, thereby providing reliable support for the efficient design of the Hall current sensor in the high requirement scene.

[0016] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application provides a Hall current sensor, comprising the magnetic core according to the above-mentioned embodiments, and a Hall chip arranged at the center of the gap of the magnetic core.

[0017] According to the Hall current sensor of the embodiment of the present application, by executing the design method of the Hall current sensor magnetic core, the core problem that the linearity and sensitivity in the magnetic core design are difficult to balance accurately can be solved, the difficulty of high cost and long verification period in the traditional physical test mode is avoided, the influence of the magnetic performance caused by the machining stress and the conductor bending can be adapted, and the steady improvement of the detection accuracy of the sensor in the full range is realized, thereby providing reliable support for the efficient design of the Hall current sensor in the high requirement scene.

[0018] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be more readily understood through consideration of the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 It is a schematic diagram of working principle of Hall current sensor magnetic core in embodiments of the present application; Figure 2 It is a schematic diagram of flow of design method of Hall current sensor magnetic core in embodiments of the present application; Figure 3 It is a schematic diagram of size of Hall current sensor magnetic core structure in embodiments of the present application; Figure 4 It is a schematic diagram of design system of Hall current sensor magnetic core in embodiments of the present application.

[0020] Reference signs: copper bar 11, magnetic core 12, Hall chip 13, reference saturation point 31, measurement point 32, long straight section 33, bending section 34, design system 400 of Hall current sensor magnetic core, determination module 401, parameter determination module 402, simulation module 403. DETAILED DESCRIPTION

[0021] Embodiments of the present application will be described in more detail by referring to the drawings. Although certain embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather these embodiments are provided so that the present application can be understood more thoroughly and completely. It is understood that the drawings and embodiments of the present application are for exemplary purposes only and are not intended to limit the scope of the present application.

[0022] It is understood that each of the steps recited in the method embodiments of the present application can be executed in different orders and / or in parallel. In addition, the method embodiments can include additional steps and / or omit the execution of the steps shown. The scope of the present application is not limited in this respect.

[0023] As described in the background section, with the rapid development of the electric vehicle industry, the accuracy and stability of the three-phase current detection of the electric drive controller are increasingly demanding. The Hall current sensor has become a core adaptive component due to its small size and wide dynamic range. The structure size of the magnetic core directly affects the linearity and sensitivity of the sensor. In related technologies, it is difficult for the Hall current sensor and the magnetic core to achieve precise balance in the full range, and the design method relying on physical sample testing has high cost and long verification period. At the same time, the actual working conditions such as magnetic core processing stress and conductor bending also increase the design difficulty, which is difficult to meet the efficient adaptation needs of industrial production.

[0024] In view of the deficiencies of the related art, the design method of the Hall current sensor magnetic core of the present application effectively solves the core problem of mutual restriction of linearity and sensitivity by clearly defining the target value of the saturation reference magnetic flux density of the magnetic core, and adjusting the key structure size in combination with the simulation analysis system. The high cost and long period of traditional physical testing are avoided, and the influence of magnetic performance caused by processing stress and conductor bending is adapted, thereby improving the full-range detection accuracy of the sensor and providing efficient and reliable technical support for magnetic core design with different range requirements.

[0025] Reference will now be made to the drawings Figures 1-3 The design method of the Hall current sensor magnetic core provided by the embodiments of the present application is described.

[0026] As shown in Figure 1 , it is a working principle schematic diagram of the Hall current sensor magnetic core in the embodiments of the present application. The copper bar 11 passes through the center of the C-shaped magnetic core 12, the Hall chip 13 is placed at the air gap of the magnetic core 12, and the Hall disc is located at the center of the air gap of the magnetic core 12. When the copper bar 11 has current passing through it, a corresponding magnetic field will be generated inside the magnetic core 12, and the Hall chip 13 will output a voltage signal in proportion to the amplitude of the current in the copper bar 11, thereby realizing current detection. When the highest working current is passed through the copper bar 11, the highest magnetic flux density inside the magnetic core 12 is less than and as close as possible to the saturation magnetic flux density of the magnetic core 12, which can balance the sensitivity and linearity of the Hall sensor.

[0027] As shown in Figure 2 , the design method of the Hall current sensor magnetic core of the embodiments of the present application can include the following steps: Step S201, determining the reference magnetic flux density target value of the magnetic core in the saturation state.

[0028] Specifically, the inner side fillet of the magnetic core is the highest magnetic flux density position of the magnetic core. However, considering the special structure of the bending part of the magnetic core, the midpoint of the intersection line of the symmetric surface and the inner hole surface of the magnetic core is selected as the reference saturation point, and the magnetic flux density value of the point is used as the basis for judging whether the magnetic core is saturated.

[0029] Step S202: Set several key structural dimensions of the magnetic core. The key structural dimensions include at least the air gap length, the air gap cross-sectional area, the horizontal distance between the inner wall of the magnetic core and the conductor, and the vertical distance between them.

[0030] As an optional embodiment, the air gap cross-sectional area is formed by the product of the air gap width and the air gap height; after determining the air gap cross-sectional area, the inner ring size of the magnetic core is kept unchanged, and the outer ring size of the magnetic core is adjusted to adjust the air gap width and / or air gap height.

[0031] As an optional embodiment, when the conductor is bent, the key structural dimension also includes the distance from the surface of the bent section of the conductor to the surface of the magnetic core; the method also includes: in response to the conductor bending toward the midpoint of the intersection line between the magnetic core symmetry plane and the surface of the magnetic core hole, increasing the distance from the surface of the bent section of the conductor to the surface of the magnetic core.

[0032] Specifically, such as Figure 3 The diagram shown is a dimensional schematic of the Hall current sensor core 12 structure in this embodiment. The dimensions determining the core 12 structure are summarized as follows: air gap length l, air gap width d, air gap height h, horizontal distance a from the inner wall of the core 12 to the surface of the copper busbar 11, vertical distance b from the inner wall of the core 12 to the surface of the copper busbar 11, and additionally, the distance c from the surface of the bent section 34 of the copper busbar 11 to the surface of the core 12 when the copper busbar 11 must be bent. Assuming the range of the Hall current sensor core 12 is 1200A, the air gap cross-sectional area is first set (composed of the product of the air gap width d and the air gap height h). The target value of the air gap cross-sectional area is determined based on the size of the Hall chip 13 and the assembly space requirements of the core 12. Keeping the inner ring size of the core 12 unchanged, the outer ring size of the core 12 is adjusted to accommodate the specific values ​​of the air gap width d and air gap height h (if space needs to be reserved for the Hall chip 13). When there is more installation space, the ratio of d to h can be adjusted while keeping the cross-sectional area unchanged. Combine the sensor installation space to set the air gap length l, and then set the horizontal distance a between the inner wall of the magnetic core 12 and the copper busbar 11 and the vertical distance b between the inner wall of the magnetic core 12 and the surface of the copper busbar 11. Place the copper busbar 11 in the center of the inner hole of the magnetic core 12 so that the horizontal distance a between the inner wall of the magnetic core 12 and the surface of the copper busbar 11 and the vertical distance b between the inner wall of the magnetic core 12 and the surface of the copper busbar 11 are symmetrically set. Adjust the position of the copper busbar 11 as needed according to the working conditions. When there is a bend in the conductor, the distance c between the surface of the conductor bending section 34 and the surface of the magnetic core 12 needs to be set. If the copper busbar 11 bends towards the reference saturation point 31 of the magnetic core 12 (the midpoint of the intersection of the symmetry plane of the magnetic core 12 and the inner hole surface), increase the distance c between the surface of the conductor bending section 34 and the surface of the magnetic core 12 to avoid excessive interference to the magnetic flux density distribution.

[0033] Step S203: Through simulation analysis, adjust the key structural dimensions so that when the conductor is supplied with a preset maximum operating current, the difference between the reference magnetic flux density and the target value of the reference magnetic flux density is less than the preset difference.

[0034] As an optional embodiment, the reference magnetic flux density is reduced by increasing the air gap length and / or increasing the air gap cross-sectional area.

[0035] As an optional embodiment, the reference magnetic flux density is the magnetic flux density value at the midpoint of the intersection line between the symmetry plane of the magnetic core and the inner hole surface of the magnetic core.

[0036] Specifically, assuming that the range of the Hall current sensor magnetic core 12 is 1200A, according to the linearity analysis of the measurement data of the proposed magnetic core physical object, it is specified that the reference magnetic flux density value of the proposed magnetic core made of a specific material under the saturation state is 1.25T, after the initial key structural size parameters are determined, the magnetic field distribution of the copper bar passing through the 1200A preset maximum working current is simulated, the magnetic flux density value at the midpoint of the intersection line between the symmetry plane of the magnetic core and the inner hole surface (reference saturation point 31) is extracted, the reference magnetic flux density value is compared with the target value 1.25T, if the difference exceeds the preset range, the air gap length l or the air gap cross-sectional area can be increased to reduce the reference magnetic flux density, and the simulation verification is performed again, and the key structural size is repeatedly adjusted until the difference between the reference magnetic flux density value and the target value 1.25T is less than the preset difference.

[0037] As an optional embodiment, the method further comprises: based on the ideal saturation magnetic flux density of the magnetic core material and the magnetic property attenuation caused by the processing stress, determining the reference magnetic flux density target value of the magnetic core under the saturation state by performing linearity analysis on the measurement data of the magnetic core physical object sample.

[0038] As an optional embodiment, the magnetic core material is oriented silicon steel.

[0039] Specifically, the magnetic core material adopts oriented silicon steel, and the magnetic flux density curve slope mutation point Bs1 is obtained according to the BH curve of the material. In the processing of the magnetic core, the processing stress generated by processes such as stamping and bending will destroy the magnetic domain structure, and the reference magnetic flux density value Bs2 of the magnetic core under the saturation state is less than Bs1. A plurality of groups of oriented silicon steel magnetic core physical object samples of different batches are selected, linearity detection is performed on each sample under different currents, the obtained data is statistically analyzed, the ideal magnetic property of the material and the magnetic property attenuation caused by the processing stress are combined, and the reference magnetic flux density target value of the magnetic core under the saturation state is determined.

[0040] To sum up, the application provides a design method of a Hall current sensor magnetic core, including the following steps: determining a reference magnetic flux density target value of the magnetic core in a saturated state; setting a plurality of key structure sizes of the magnetic core, the key structure sizes at least including a gap length, a gap cross-sectional area, a horizontal distance and a vertical distance between an inner wall of the magnetic core and a conductor; and adjusting the key structure sizes through simulation analysis, so that a difference between the reference magnetic flux density of the magnetic core and the reference magnetic flux density target value is less than a preset difference value when the conductor passes in a preset highest working current. Therefore, the application can solve the core problem that the linearity and the sensitivity are difficult to accurately balance in the related magnetic core design, avoid the difficulty of high cost and long verification period in the traditional physical test mode, adapt to the influence of the magnetic performance caused by the machining stress and the conductor bending, and further realize the steady improvement of the detection precision of the sensor full range, thereby providing reliable support for the efficient design of the Hall current sensor in the high requirement scene.

[0041] It should be noted that the method of the embodiments of the application can be executed by a single device, such as a computer or a server, etc. The method of the embodiments can also be applied to a distributed scenario, and completed by multiple devices cooperating with each other. In this distributed scenario, one of the multiple devices can only execute one or more steps in the method of the embodiments of the application, and the multiple devices can interact with each other to complete the above method.

[0042] It should be noted that some embodiments of the application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than the order described above and still achieve the desired result. In addition, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0043] Reference Figure 4 The figure is a schematic diagram of a design system of a Hall current sensor magnetic core in the embodiments of the application.

[0044] The design system 400 of the Hall current sensor magnetic core includes a determination module 401, a parameter setting module 402 and a simulation module 403.

[0045] The determining module 401 is configured to determine a reference magnetic flux density target value of the magnetic core in a saturated state; the parameter setting module 402 is configured to set a plurality of key structural dimensions of the magnetic core, the key structural dimensions at least including a gap length, a gap cross-sectional area, a horizontal distance and a vertical distance between an inner wall of the magnetic core and the conductor; and the simulation module 403 is configured to adjust the key structural dimensions through simulation analysis, so that a difference between the reference magnetic flux density of the magnetic core and the reference magnetic flux density target value is less than a preset difference when the conductor passes through a preset highest working current.

[0046] The parameter setting module 402 is further configured to: The gap cross-sectional area is composed of a product of the gap width and the gap height. After the gap cross-sectional area is determined, the outer ring size of the magnetic core is adjusted to adjust the gap width and / or the gap height while the inner ring size of the magnetic core is kept unchanged.

[0047] Optionally, the parameter setting module 402 is further configured to: When the conductor exists a bending, the key structural dimensions further include a distance from a surface of the conductor bending section to a surface of the magnetic core. The method further includes: In response to the conductor bending towards a midpoint between a symmetry plane of the magnetic core and a surface of an inner hole of the magnetic core, the distance from the surface of the conductor bending section to the surface of the magnetic core is increased.

[0048] The simulation module 403 is further configured to: The reference magnetic flux density is reduced by increasing the gap length and / or increasing the gap cross-sectional area.

[0049] Optionally, the simulation module 403 is further configured to: The reference magnetic flux density is a magnetic flux density value of the midpoint between the symmetry plane of the magnetic core and the surface of the inner hole of the magnetic core.

[0050] Optionally, the simulation module 403 is further configured to: The method further includes: Based on an ideal saturated magnetic flux density of the magnetic core material and a magnetic property attenuation caused by a processing stress, the reference magnetic flux density target value of the magnetic core in the saturated state is determined through linearity analysis on measured data of a physical sample of the magnetic core.

[0051] Optionally, the simulation module 403 is further configured to: The magnetic core material is oriented silicon steel.

[0052] According to the design system of the Hall current sensor magnetic core provided in the application, the core problem of difficult accurate balance between linearity and sensitivity in related magnetic core design is effectively solved, the difficulty of high cost and long verification period in the traditional physical test mode is avoided, the influence of magnetic performance caused by processing stress and conductor bending can be adapted, and then the steady improvement of the full-range detection precision of the sensor is realized, thereby providing reliable support for efficient design of the Hall current sensor in high requirement scenarios.

[0053] The application also provides a magnetic core, the structure size of which is obtained by the design method of the Hall current sensor magnetic core according to any one of the above.

[0054] The magnetic core of the above embodiment is used to implement the design method of the corresponding Hall current sensor magnetic core in any one of the above embodiments, and has the beneficial effects of the design method embodiment of the corresponding Hall current sensor magnetic core, which will not be repeated here.

[0055] Based on the same concept, the application also provides a Hall current sensor corresponding to the design method of the Hall current sensor magnetic core provided in any one of the above embodiments, which comprises the magnetic core described above, and a Hall chip arranged at the center of the air gap of the magnetic core.

[0056] The Hall current sensor of the above embodiment is used to implement the design method of the corresponding Hall current sensor magnetic core in any one of the above embodiments, and has the beneficial effects of the design method embodiment of the corresponding Hall current sensor magnetic core, which will not be repeated here.

[0057] It should be noted that in this document, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0058] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned example methods can be realized by means of a computer software product and a general hardware platform as necessary, and of course can also be realized by hardware. The computer software product is stored in a storage medium (such as a ROM, a RAM, a magnetic disc, an optical disc, etc.), and includes a plurality of instructions for enabling a terminal or a network side device to execute the method described in each embodiment of the present application.

[0059] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative rather than limiting. Those skilled in the art can make many forms of embodiments under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims, and these embodiments all belong to the protection of the present application.

Claims

1. A design method for a Hall current sensor magnetic core, characterized in that, Includes the following steps: Determine the target value of the reference magnetic flux density of the magnetic core in saturation state; Several key structural dimensions of the magnetic core are defined, including at least the air gap length, air gap cross-sectional area, horizontal distance between the inner wall of the magnetic core and the conductor, and vertical distance between the two. Through simulation analysis, the key structural dimensions are adjusted so that when a preset maximum operating current is applied to the conductor, the difference between the reference magnetic flux density and the target value of the reference magnetic flux density of the magnetic core is less than a preset difference.

2. The design method of the Hall current sensor magnetic core according to claim 1, characterized in that, The cross-sectional area of ​​the air gap is formed by the product of the air gap width and the air gap height; After determining the air gap cross-sectional area, keep the inner ring size of the magnetic core unchanged and adjust the outer ring size of the magnetic core to adjust the air gap width and / or the air gap height.

3. The design method of the Hall current sensor magnetic core according to claim 1 or 2, characterized in that, The reference magnetic flux density is reduced by increasing the air gap length and / or increasing the air gap cross-sectional area.

4. The design method of the Hall current sensor magnetic core according to claim 1, characterized in that, The reference magnetic flux density is the magnetic flux density value at the midpoint of the intersection line between the symmetry plane of the magnetic core and the surface of the inner hole of the magnetic core.

5. The design method of the Hall current sensor magnetic core according to claim 1, characterized in that, When the conductor is bent, the critical structural dimension also includes the distance from the surface of the bent section of the conductor to the surface of the magnetic core; The method further includes: In response to the conductor bending toward the midpoint of the intersection of the plane of symmetry of the magnetic core and the surface of the inner hole of the magnetic core, the distance from the surface of the bent section of the conductor to the surface of the magnetic core is increased.

6. The design method of the Hall current sensor magnetic core according to claim 1, characterized in that, The method further includes: Based on the ideal saturation magnetic flux density of the core material and the magnetic property decay caused by processing stress, the target value of the reference magnetic flux density of the core in the saturation state is determined by linearity analysis of the measurement data of the physical sample of the core.

7. The design method of the Hall current sensor magnetic core according to claim 6, characterized in that, The magnetic core material is oriented silicon steel.

8. A design system for a Hall current sensor core, characterized in that, Includes the following steps: The determination module is configured to determine the target value of the reference magnetic flux density of the magnetic core in a saturated state; The parameter setting module is configured to set multiple key structural dimensions of the magnetic core, including at least the air gap length, air gap cross-sectional area, horizontal distance between the inner wall of the magnetic core and the conductor, and vertical distance between them. The simulation module is configured to adjust the key structural dimensions through simulation analysis so that when a preset maximum operating current is applied to the conductor, the difference between the reference magnetic flux density and the target value of the reference magnetic flux density of the magnetic core is less than a preset difference.

9. A magnetic core, characterized in that, Its structural dimensions are obtained by the design method of the Hall current sensor core as described in any one of claims 1 to 7.

10. A Hall current sensor, characterized in that, It includes the magnetic core as described in claim 9, and a Hall chip disposed in the center of the air gap of the magnetic core.

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