Current sensor and electronic equipment

Abstract

The invention relates to the technical field of current measurement, and discloses a current sensor and electronic equipment. The current sensor comprises a magnetism gathering ring, a magnetic induction module and a shielding module. The magnetism gathering ring is provided with at least one opening air gap and is used for gathering and amplifying an induced magnetic field generated by a to-be-detected current wire penetrating through the magnetism gathering ring; the magnetic induction module comprises at least one magnetic induction unit and at least one magnetic conductive sheet pair, and is used for sensing an air gap magnetic field in the opening air gap and outputting an electric signal related to the load current of the current lead to be detected; the shielding module comprises a first shielding ring arranged outside the magnetism gathering ring and a second shielding ring arranged outside the first shielding ring; the opening of the first shielding ring faces the opening air gap, and the opening of the second shielding ring and the opening of the first shielding ring are staggered by a certain angle. According to the current sensor, through the synergistic effect of the magnetic induction module, the first shielding ring and the second shielding ring, the high sensitivity, the wide range and the good anti-interference effect are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of current measurement, and particularly to a current sensor and an electronic device. Background Art

[0002] A current sensor is a current detection device that can convert the detected current information of the measured object into an electrical signal or other required form of information that conforms to certain standards according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording, and control, etc. It is widely used in many fields such as household appliances, smart grids, electric vehicles, and wind power generation.

[0003] Due to its advantages such as small size, high sensitivity, high resolution, low power consumption, and wide dynamic range, the magnetoresistive current sensor based on the magnetoresistive effect has been widely used.

[0004] Complex electromagnetic interference in the application environment will affect the measurement sensitivity and working stability of the magnetoresistive current sensor. Generally, reasonable methods need to be adopted to avoid it and achieve anti-interference.

[0005] Simply setting a shielding ring outside the current sensor has a certain anti-interference effect, but due to the aggregation effect of the shielding ring, it is easy to cause the current sensor to have a narrow range, which limits the use range of the current sensor. Summary of the Invention

[0006] The object of the present invention is to provide a current sensor and an electronic device to improve the problems that the sensitivity and working stability of the existing magnetoresistive current sensor are easily affected by electromagnetic interference in a complex environment and the range is relatively narrow while improving the anti-interference effect through a shielding ring.

[0007] To solve the above problems, the present invention adopts the following technical solutions: The first aspect of the present invention provides a current sensor, including: A magnetic focusing ring having at least one open air gap for focusing and amplifying the induced magnetic field generated by the current-carrying wire to be measured passing through the magnetic focusing ring; A magnetic induction module including at least one magnetic induction unit and at least one pair of magnetic conduction sheets for sensing the air gap magnetic field in the open air gap and outputting an electrical signal related to the load current of the current-carrying wire to be measured; the magnetic induction unit is located in the open air gap, and the pair of magnetic conduction sheets is located on both sides of the magnetic induction unit along the penetration direction of the current-carrying wire to be measured; A shielding module including a first shielding ring externally provided on the magnetic focusing ring and a second shielding ring externally provided on the first shielding ring; the opening of the first shielding ring faces the open air gap directly; the opening of the second shielding ring is offset from the opening of the first shielding ring by a certain angle.

[0008] According to some embodiments of the present invention, the magnetic field direction of the air-gap magnetic field is perpendicular to the penetration direction; the magnetic induction unit is sensitive to the air-gap magnetic field.

[0009] According to some embodiments of the present invention, the magnetic induction module further includes a magnetic field conversion unit, which is configured to convert the magnetic field component in the direction of the air-gap magnetic field into an in-plane magnetic field component orthogonal to the magnetic field direction of the air-gap magnetic field and then apply it to the magnetic induction unit; the magnetic induction unit has a magnetic sensitive direction in the plane.

[0010] According to some embodiments of the present invention, the magnetic induction unit includes a substrate and a first magnetoresistive element, a second magnetoresistive element, a third magnetoresistive element, and a fourth magnetoresistive element that are deposited above the substrate and coupled to each other. The first magnetoresistive element, the second magnetoresistive element, the third magnetoresistive element, and the fourth magnetoresistive element are coupled to each other to form a Wheatstone bridge structure; the first magnetoresistive element and the third magnetoresistive element have a first magnetic sensitive direction in the plane, and the second magnetoresistive element and the fourth magnetoresistive element have a second magnetic sensitive direction in the plane that is anti-parallel to the first magnetic sensitive direction. The magnetic induction unit further includes a plurality of soft magnetic blocks, which are configured to convert the magnetic field component of the air-gap magnetic field into an in-plane magnetic field component and then apply it to the first magnetoresistive element, the second magnetoresistive element, the third magnetoresistive element, and the fourth magnetoresistive element.

[0011] According to some embodiments of the present invention, the thickness of the first shielding ring and the second shielding ring in the penetration direction is at least twice the thickness of the magnetic focusing ring in the penetration direction.

[0012] According to some embodiments of the present invention, the opening of the second shielding ring forms an angle of 30° to 150° with the opening of the first shielding ring.

[0013] According to some embodiments of the present invention, the thickness of the magnetic focusing ring and the magnetic conductive sheet in the penetration direction is 8 mm, and the thickness of the first shielding ring and the second shielding ring in the penetration direction is 20 mm; the opening of the second shielding ring forms an angle of 90° with the opening of the first shielding ring.

[0014] According to some embodiments of the present invention, the distance between the magnetic focusing ring and the first shielding ring is greater than 10 mm; the distance between the second shielding ring and the first shielding ring is greater than 2 mm.

[0015] According to some embodiments of the present invention, the distance between the magnetic focusing ring and the first shielding ring is less than 25 mm.

[0016] The distance between the second shielding ring and the first shielding ring is less than 20 mm.

[0017] According to some embodiments of the present invention, the magnetic focusing ring has a first open air gap and a second open air gap, and the first open air gap and the second open air gap are symmetrically distributed along the center of the magnetic focusing ring; The at least one magnetic induction unit includes a first magnetic induction unit and a second magnetic induction unit, the first magnetic induction unit is located in the first open air gap, and the second magnetic induction unit is located in the second open air gap; The first shielding ring has an opening 1 and an opening 2, wherein the opening 1 is directly opposite to the first opening air gap; the opening 2 is directly opposite to the second opening air gap; The second shielding ring has an opening three and an opening four, the opening three forms a first angle with the opening one, and the opening four forms the first angle with the opening two; the first angle is 30-150 degrees.

[0018] A second aspect of the present invention provides an electronic device. The electronic device comprises a first conducting wire and a current sensor for measuring current on the first conducting wire, wherein the current sensor is the above-mentioned current sensor.

[0019] The present invention has the following beneficial effects: The current sensor provided by the present invention includes a magnetic focusing ring, a magnetic induction module and a shielding module; the magnetic focusing ring has at least one open air gap, which is used to gather and amplify the induced magnetic field generated by the current conductor to be measured that passes through the magnetic focusing ring; the magnetic induction module includes at least one magnetic induction unit and at least one pair of magnetic conductive sheets, which are used to sense the air gap magnetic field in the open air gap and output an electrical signal related to the load current of the current conductor to be measured; the shielding module includes a first shielding ring externally arranged on the magnetic focusing ring and a second shielding ring externally arranged on the first shielding ring; the opening of the first shielding ring is directly opposite to the open air gap, and the opening of the second shielding ring is staggered at a certain angle from the opening of the first shielding ring. The present invention uses the synergistic effect of the magnetic induction module, the first shielding ring and the second shielding ring to achieve high sensitivity, wide range and good anti-interference effect in complex electromagnetic interference environments for current measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a current sensor according to a first embodiment of the present invention; Figure 2 is a schematic structural diagram of a current sensor according to a second embodiment of the present invention; Figure 3 Schematic diagram of the first magnetic induction unit in the first embodiment of the present invention; Figure 4 Schematic diagram of the current sensor of the first comparative example of the present invention; Figure 5 Schematic diagram of the current sensor of the second comparative example of the present invention; Figure 6 Schematic diagram of the current sensor of the third comparative example of the present invention; Figure 7 Schematic diagram of the current sensor of the fourth comparative example of the present invention; Figure 8 Schematic diagram of the current sensor of the fifth comparative example of the present invention; Figure 9 Variation curve of the magnetic field at the air gap with the load current for the current sensors of the second embodiment and the first comparative example of the present invention; Figure 10 Variation curve of the magnetic field at the air gap with the Z-axis interference magnetic field when there is a load current of 500 A for the current sensors of the second embodiment and the first comparative example of the present invention; Figure 11 Variation curve of the magnetic field at the air gap with the Z-axis interference magnetic field when there is a load current of 500 A for the current sensors of the second embodiment and the third comparative example of the present invention; Figure 12 Simulation diagram of the surrounding magnetic field of the current sensor of the first comparative example of the present invention under the X-axis interference magnetic field; Figure 13 Simulation diagram of the surrounding magnetic field of the current sensor of the second embodiment of the present invention under the X-axis interference magnetic field; Figure 14 Variation curve of the magnetic field at the air gap with the X-axis interference magnetic field when there is no load current for the current sensors of the second embodiment and the first comparative example of the present invention; Figure 15 Simulation schematic diagram of the surrounding magnetic field of the current sensor of the first comparative example of the present invention under the Z-axis interference magnetic field; Figure 16 Simulation schematic diagram of the surrounding magnetic field of the current sensor of the second embodiment of the present invention under the Z-axis interference magnetic field; Figure 17 Variation curve of the magnetic field at the air gap with the Z-axis interference magnetic field when there is no load current for the current sensors of the second embodiment and the first comparative example of the present invention; Figure 18 Simulation diagram of the surrounding magnetic field of the fourth comparative example current sensor under the Z-axis interference magnetic field of 10 Oe; Figure 19It is the simulation diagram of the surrounding magnetic field of the fifth comparative example current sensor under the Z-axis interference magnetic field of 10 Oe; Figure 20 It is the simulation diagram of the surrounding magnetic field of the fifth comparative example current sensor when the load current is 3 A; Figure 21 It is the simulation diagram of the surrounding magnetic field of the third comparative example current sensor under the Z-axis interference magnetic field of 10 Oe; Figure 22 It is the simulation diagram of the surrounding magnetic field of the third comparative example current sensor under the X-axis interference magnetic field of 10 Oe.

[0022] The realization, functional features and advantages of the purpose of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The "X direction", "Y direction", "Z direction", "XY plane direction", "YZ plane direction", and "XZ plane direction" are defined as needed. Here, the "XY plane direction" is the plane direction of the substrate constituting the magnetic induction unit. The "X direction" and "Y direction" are orthogonal directions within the XY plane, and the Z direction is the thickness direction of the substrate constituting the magnetic induction unit and is also perpendicular to the XY plane.

[0025] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there is a description involving "first", "second", etc. in the embodiments of the present invention, the descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] A current sensor is a current detection device that can convert the detected current information of the measured object into an electrical signal or other required forms of information that conform to certain standards according to certain rules and output it to meet the requirements of information transmission, processing, storage, display, recording, and control, etc. It is widely used in many fields such as household appliances, smart grids, electric vehicles, and wind power generation.

[0028] Due to its advantages such as small size, high sensitivity, high resolution, low power consumption, and wide dynamic range, the magnetoresistive current sensor based on the magnetoresistive effect has been widely used. Complex electromagnetic interference in the application environment will affect the measurement sensitivity and working stability of the magnetoresistive current sensor. Generally, reasonable methods need to be taken to avoid it and achieve anti-interference.

[0029] To improve the problem that the existing magnetoresistive current sensor is easily affected by complex electromagnetic interference in the application environment, which affects its measurement sensitivity and working stability, the embodiments of the present invention provide a current sensor and a current sensor with good anti-interference effects and a wide measurement range.

[0030] Figure 1 It is a schematic diagram of the current sensor according to the first embodiment of the present invention. The current sensor according to the embodiment of the present invention includes a magnetic focusing ring, a magnetic induction module, and a shielding module. The magnetic focusing ring has an open air gap for aggregating and amplifying the induced magnetic field generated by the current-carrying wire to be measured passing through the magnetic focusing ring. The magnetic induction module includes a magnetic induction unit located in the open air gap and a pair of magnetic conductive sheets on both sides of the magnetic induction unit. The shielding module includes two shielding rings. The two shielding rings are sequentially arranged at a certain distance from the outside of the magnetic focusing ring. Each of the two shielding rings has an opening. The opening of the first shielding ring closer to the magnetic focusing ring is directly opposite to the open air gap of the magnetic focusing ring, and the opening of the second shielding ring farther from the magnetic focusing ring is offset by a certain angle from the opening of the first shielding ring closer to the magnetic focusing ring.

[0031] It should be noted that the number of open air gaps of the magnetic concentrating ring is not limited to 1, and the number of openings of the first shielding ring and the second shielding ring corresponds to the number of open air gaps. When the number of open air gaps is 2, both the first shielding ring and the second shielding ring have 2 openings. The number of the magnetic induction units is not limited to 1, but the number thereof is not more than the number of open air gaps. When the number of magnetic induction units is 2, the output data of the 2 magnetic induction units can be adopted simultaneously, or only the output data of one of the magnetic induction units can be adopted, and the current information of the current-carrying wire to be measured can be determined according to the output data. The magnetic concentrating ring has an effect of aggregating the magnetic field. If the magnetic concentrating ring is in a saturated state when the external magnetic field is the first magnetic field, the maximum measurable current of the current sensor should have a magnetic field lower than the first magnetic field in the open air gap. The magnetic conductive sheet pair here refers to a pair of magnetic conductive sheets, which are respectively located on both sides of the magnetic induction unit.

[0032] Specifically, the magnetic concentrating ring 100 of the embodiment of the present invention has a first open air gap 110 for concentrating and amplifying the induced magnetic field generated by the current-carrying wire 400 to be measured passing through the magnetic concentrating ring 100. The XZ plane of the magnetic concentrating ring 100 is circular, and the Y direction is its thickness direction. The passing direction of the current-carrying wire 400 to be measured is the Y direction. The direction of the air gap magnetic field in the first open air gap 110 is the Z direction.

[0033] It should be noted that the cross-sectional shape of the magnetic concentrating ring is preferably circular, and can also be other annular structures, which are not specifically limited here.

[0034] The magnetic induction module of the embodiment of the present invention includes a first magnetic induction unit 211 located in the first open air gap 110 and a first pair of magnetic conductive sheets on both sides of the first magnetic induction unit 211 along the passing direction of the current-carrying wire 400 to be measured, that is, the Y direction: a first inner magnetic conductive sheet 231 and a first outer magnetic conductive sheet 221, which are used to sense the air gap magnetic field in the first open air gap 110 and output an electric signal related to the load current of the current-carrying wire 400 to be measured.

[0035] Among them, the first outer magnetic conductive sheet 221 is located on the side of the first open air gap 110 away from the current-carrying wire 400 to be measured, that is, near the outside of the first open air gap 110, and is parallel to the YZ plane; the first inner magnetic conductive sheet 231 is located on the side of the first open air gap 110 close to the current-carrying wire 400 to be measured, that is, near the inside of the first open air gap 110, and is parallel to the YZ plane. The first pair of magnetic conductive sheets is used to close both sides of the first open air gap 110, so that the direction of the air gap magnetic field in the first open air gap 110 when acting on the first magnetic induction unit 211 is parallel to the Z-axis direction.

[0036] When the first magnetic induction unit 211 is placed on the XY plane, it can be magnetically sensitive to the magnetic field in the Z-axis direction. Figure 3 It is a schematic structural diagram of the magnetic induction unit of the embodiment of the present invention. AsFigure 3 As shown, the magnetic induction unit, i.e., the first magnetic induction unit 211, includes a substrate 2101, and the substrate 2101 is parallel to the XY plane direction. The first magnetic induction unit 211 further includes four magnetoresistances deposited above the substrate 2101: a first magnetoresistance R1, a second magnetoresistance R2, a third magnetoresistance R3, and a fourth magnetoresistance R4. The first magnetoresistance R1 and the third magnetoresistance R3 have the same magnetic sensitive direction, and this magnetic sensitive direction is the +X direction; the second magnetoresistance R2 and the fourth magnetoresistance R4 have the same magnetic sensitive direction, and its magnetic sensitive direction is the -X direction. The first magnetic induction unit 211 further includes soft magnetic blocks deposited above the substrate 2101: a first soft magnetic block 2102, a second soft magnetic block 2103, a third soft magnetic block 2104, and a fourth soft magnetic block 2105. Among them, the first soft magnetic block 2102 is located around the first magnetoresistance R1 and is used to convert the magnetic field component of the air gap magnetic field in the Z axis into an X-axis magnetic field component and then apply it to the first magnetoresistance R1; the second soft magnetic block 2103 is located around the second magnetoresistance R2 and is used to convert the magnetic field component of the air gap magnetic field in the Z axis into an X-axis magnetic field component and then apply it to the second magnetoresistance R2; the third soft magnetic block 2104 is located around the third magnetoresistance R3 and is used to convert the magnetic field component of the air gap magnetic field in the Z axis into an X-axis magnetic field component and then apply it to the third magnetoresistance R3; the fourth soft magnetic block 2105 is located around the fourth magnetoresistance R4 and is used to convert the magnetic field component of the air gap magnetic field in the Z axis into an X-axis magnetic field component and then apply it to the fourth magnetoresistance R4. Furthermore, the first magnetic induction unit 211 can achieve magnetic sensitivity to the air gap magnetic field in the Z axis.

[0037] The shielding module according to the embodiment of the present invention includes a first shielding ring 310 externally provided on the magnetic concentrating ring 100 and a second shielding ring 320 externally provided on the first shielding ring 310. Among them, the first shielding ring 310 has an opening 311, and the opening 311 faces the first opening air gap 110 directly. The second shielding ring 320 has an opening 321, and the opening 321 is offset from the opening 311 and forms a 90-degree angle. Furthermore, the shielding module is used to jointly shield the interference magnetic field around the magnetic concentrating ring 100 through the first shielding ring 310 and the second shielding ring 320.

[0038] In the magnetic concentrating ring 100 of the embodiment of the present invention, the inner ring radius of the XZ-plane ring is 18 mm, the outer ring radius is 24 mm, the thickness along the Y direction is 8 mm, and the width of the first opening air gap 110 in the Z-axis direction is 5 mm. The first inner magnetic conductive sheet 231 and the first outer magnetic conductive sheet 221 have the same structure. Its XZ plane is a rectangle, the length in the X direction is that the inner ring radius of the XZ-plane ring in the first shielding ring 310 is 37 mm, the outer ring radius is 39 mm, the thickness along the Y direction is 20 mm, and the width of the first opening along the Z-axis direction is 5 mm. The inner ring radius of the XZ-plane ring in the second shielding ring 320 is 43 mm, the outer ring radius is 45 mm, the thickness along the Y direction is 20 mm, and the width of the third opening along the Z-axis direction is 5 mm. The width of the magnetic conductive sheet in the Z-axis direction is 4.8 mm, which is lower than the width of the first opening air gap 110.

[0039] It should be noted that in the embodiment of the present invention, the distance between the magnetic concentrating ring 100 and the first shielding ring 310 is: the distance between the outer ring of the magnetic concentrating ring 100 and the inner ring of the first shielding ring 310 is 13 mm, and this distance value is preferably more than 10 mm and less than 25 mm. The width of the magnetic conductive sheet in the Z-axis direction should be less than the width of the first opening air gap 110 in the Z-axis direction, and its thickness in the Y-axis direction should not be less than the thickness of the magnetic concentrating ring 100. The distance between the first shielding ring 310 and the second shielding ring 320 is: the distance between the outer ring of the first shielding ring 310 and the inner ring of the second shielding ring 320 is 2 mm, and this distance value is preferably less than 20 mm. The thickness of the first shielding ring 310 and the second shielding ring 320 in the Y-axis direction should preferably be more than 2 times the thickness of the magnetic concentrating ring 100 in the Y-axis direction. The width of the first inner magnetic conductive sheet 231 and the first outer in the Z-axis direction should be less than the width of the opening air gap.

[0040] Figure 2 It is a schematic diagram of the current sensor according to the second embodiment of the present invention. Compared with the current sensor of the first embodiment, the current sensor of the embodiment of the present invention has the following differences: The magnetic concentrating ring 100 includes 2 opening air gaps: the first opening air gap 110 and the second opening air gap 120, the magnetic induction module includes 2 magnetic induction units: the first magnetic induction unit 211 and the second magnetic induction unit 212 and 2 pairs of magnetic conductive sheets: the first inner magnetic conductive sheet 231 and the first outer magnetic conductive sheet 221 in the first pair of magnetic conductive sheets and the second inner magnetic conductive sheet 232 and the second outer magnetic conductive sheet 222 in the second pair of magnetic conductive sheets, the shielding module includes the first shielding ring 310 and the second shielding ring 320, and the first shielding ring 310 and the second shielding ring 320 each have two openings.

[0041] Specifically, the magnetic concentrating ring 100 of the embodiment of the present invention has a first open air gap 110 and a second open air gap 120, which are used to concentrate and amplify the induced magnetic field generated by the current-carrying wire 400 to be measured passing through the magnetic concentrating ring 100. The XZ plane of the magnetic concentrating ring 100 is circular, and the Y direction is its thickness direction. The passing direction of the current-carrying wire 400 to be measured is the Y direction. The first open air gap 110 and the second open air gap 120 are symmetrically distributed along the center of the magnetic concentrating ring 100, and the direction of the air gap magnetic field is the Z direction.

[0042] The magnetic induction module of the embodiment of the present invention includes a first magnetic induction unit 211 located in the first open air gap 110, a second magnetic induction unit 212 located in the second open air gap 120, a first pair of magnetic conduction sheets on both sides of the first magnetic induction unit 211 along the passing direction of the current-carrying wire 400 to be measured, that is, the Y direction: a first inner magnetic conduction sheet 231 and a first outer magnetic conduction sheet 221, and a second pair of magnetic conduction sheets on both sides of the second magnetic induction unit 212 along the passing direction of the current-carrying wire 400 to be measured, that is, the Y direction: a second inner magnetic conduction sheet 232 and a second outer magnetic conduction sheet 222, which are used to sense the air gap magnetic field in the first open air gap 110 and / or the second open air gap 120 and output an electrical signal related to the load current of the current-carrying wire 400 to be measured.

[0043] The first outer magnetic conduction sheet 221 is located on the side of the first open air gap 110 far from the current-carrying wire 400, that is, the outside close to the first open air gap 110, and is parallel to the YZ plane; the first inner magnetic conduction sheet 231 is located on the side of the first open air gap 110 close to the current-carrying wire 400, that is, the inside close to the first open air gap 110, and is parallel to the YZ plane. This first pair of magnetic conduction sheets is used to close both sides of the first open air gap 110, so that the direction of the air gap magnetic field in the first open air gap 110 when acting on the first magnetic induction unit 211 is parallel to the Z-axis direction.

[0044] The second outer magnetic conduction sheet 222 is located on the side of the second open air gap 120 far from the current-carrying wire 400, that is, the outside close to the second open air gap 120, and is parallel to the YZ plane; the second inner magnetic conduction sheet 232 is located on the side of the second open air gap 120 close to the current-carrying wire 400, that is, the inside close to the second open air gap 120, and is parallel to the YZ plane. This second pair of magnetic conduction sheets is used to close both sides of the second open air gap, so that the direction of the air gap magnetic field in the second open air gap 120 when acting on the second magnetic induction unit 212 is parallel to the Z-axis direction.

[0045] When the first magnetic induction unit 211 and the second magnetic induction unit 212 are placed on the XY plane, they are sensitive to the magnetic field in the Z-axis direction. The structures of the first magnetic induction unit 211 and the second magnetic induction unit 212 are the same as that of the first magnetic induction unit 211 in the first embodiment, and will not be specifically described here. Furthermore, both the first magnetic induction unit 211 and the second magnetic induction unit 212 in the embodiment of the present invention can be sensitive to the air-gap magnetic field in the Z-axis direction.

[0046] The shielding module in the embodiment of the present invention includes a first shielding ring 310 externally provided on the magnetic focusing ring 100 and a second shielding ring 320 externally provided on the first shielding ring 310. The first shielding ring 310 has two openings: opening one 311 and opening two 312. Opening one 311 faces the first opening air gap 110, and opening two 312 faces the second opening air gap 120. The second shielding ring 320 has two openings: opening three 321 and opening four 322. Opening three 321 is offset from opening one 311 by a 90-degree angle, and opening four 322 is offset from opening two by a 90-degree angle. Furthermore, the shielding module is used to cooperatively shield the interference magnetic field around the magnetic focusing ring 100 through the first shielding ring 310 and the second shielding ring 320.

[0047] It should be noted that the offset angle between opening three and opening one can be 30 degrees to 150 degrees, and preferably in the 90-degree state.

[0048] In the magnetic focusing ring 100 of the embodiment of the present invention, the inner ring radius of the XZ-plane circular ring is 18 mm, the outer ring radius is 24 mm, the thickness along the Y direction is 8 mm, and the width in the Z-axis direction of the first opening air gap 110 and the second opening air gap is 5 mm. The structures of the first inner magnetic conduction sheet 231, the second inner magnetic conduction sheet 232, the first outer magnetic conduction sheet 221, and the second outer magnetic conduction sheet 222 are the same. Their XZ plane is a rectangle, the length in the X direction is such that the inner ring radius of the XZ-plane circular ring of the first shielding ring 310 is 37 mm, the outer ring radius is 39 mm, the thickness along the Y direction is 20 mm, and the width in the Z-axis direction of opening one is 5 mm. The XZ plane of the second shielding ring 320 is in a circular ring shape, the inner ring radius is 43 mm, the outer ring radius is 45 mm, the thickness along the Y direction is 20 mm, and the width in the Z-axis direction of opening three is 5 mm. The width of each magnetic conduction sheet in the Z-axis direction is 4.8 mm, which is less than the width of the first opening air gap 110.

[0049] It should be noted that in the embodiment of the present invention, the distance between the magnetic focusing ring 100 and the first shielding ring 310, that is, the distance between the outer ring of the magnetic focusing ring 100 and the inner ring of the first shielding ring 310, is 13 mm, and this distance value is preferably 10 mm or more. The width of the magnetic conductive sheet in the Z-axis direction should be less than the width of the first opening air gap 110 in the Z-axis direction, and its thickness in the Y-axis direction should not be less than the thickness of the magnetic focusing ring 100. The distance between the first shielding ring 310 and the second shielding ring 320, that is, the distance between the outer ring of the first shielding ring 310 and the inner ring of the second shielding ring 320, is 2 mm, and this distance value is preferably less than 20 mm. The thickness of the first shielding ring 310 and the second shielding ring 320 in the Z-axis direction should preferably be more than twice the thickness of the magnetic focusing ring 100 in the Z-axis direction.

[0050] In the embodiment of the present invention, the thicknesses of the first magnetic conductive sheet 220 and the second magnetic conductive sheet 230 in the direction of the Y-axis along which the wire 400 to be measured for current passes, that is, the direction of the Y-axis, and the magnetic focusing ring 100 are all 8 mm, and the thicknesses of the first shielding ring 310 and the second shielding ring 320 are 20 mm.

[0051] It should be noted that to improve the shielding effect, the thicknesses of the first shielding ring 310 and the second shielding ring 320 can be the same or different, and their thicknesses should be at least twice the thickness of the magnetic focusing ring 100; the thicknesses of the first magnetic conductive sheet and the second magnetic conductive sheet should not be less than the thickness of the magnetic focusing ring 100.

[0052] It should be noted that to ensure the shielding effect, the thicknesses of the first magnetic conductive sheet and the second magnetic conductive sheet in the Z-axis direction should not be less than the thickness of the magnetic focusing ring 100, and the thicknesses of the first shielding ring 310 and the second shielding ring 320 in the Z-axis direction should be greater than the thicknesses of the first magnetic conductive sheet, the second magnetic conductive sheet, and the magnetic focusing ring 100 in the Z-axis direction, and the better the shielding effect is with the greater thickness in the Z-axis direction.

[0053] The following verifies the current measurement effect and anti-interference effect of the current sensor in the embodiment of the present invention.

[0054] Figure 4 It is a schematic structural diagram of a current sensor of the first comparative example. The current sensor of this comparative example includes a magnetic focusing ring 100, a first magnetic sensing unit 211, and a second magnetic sensing unit 212. Among them, the magnetic focusing ring 100 includes a symmetrically arranged first opening air gap 110 and a second opening air gap 120. The first magnetic sensing unit 211 is located in the first opening air gap 110, and the second magnetic sensing unit 212 is located in the second opening air gap 120. The first magnetic sensing unit 211 and the second magnetic sensing unit 212 can be used to sense the load current of the wire 400 to be measured for current in the magnetic focusing ring 100. Compared with the current sensor of the second embodiment, the first comparative example current sensor has the following differences: it does not include a shielding module and a pair of magnetic conductive sheets.

[0055] Figure 5 It is a schematic structural diagram of a second comparative example current sensor. The current sensor of this comparative example includes a magnetic focusing ring 100, a first magnetic sensing unit 211, a second magnetic sensing unit 212, a first inner magnetic conductive sheet 231, a second inner magnetic conductive sheet 232, a first outer magnetic conductive sheet 221, and a second outer magnetic conductive sheet 222. Among them, the magnetic focusing ring includes a symmetrically arranged first open air gap 110 and a second open air gap 120. The first inner magnetic conductive sheet 231, the first outer magnetic conductive sheet 221, and the first magnetic sensor unit 211 are all located within the first open air gap, and the first inner magnetic conductive sheet 231 and the first outer magnetic conductive sheet 221 are respectively located on both sides of the first magnetic sensing unit 211. Compared with the current sensor of the second embodiment, the second comparative example current sensor has the following differences: It does not include a shielding module.

[0056] Figure 6 It is a schematic structural diagram of a third comparative example current sensor. Compared with the current sensor of the second embodiment, the third comparative example current sensor has the following differences: It does not include a magnetic conductive pair, that is, there are no magnetic conductive sheets on both sides of the first magnetic sensing unit 211 and the second magnetic sensing unit 212.

[0057] Figure 7 It is a schematic structural diagram of a fourth comparative example current sensor. Compared with the current sensor of the second embodiment, the fourth comparative example current sensor has the following differences: The second shielding ring does not have an opening.

[0058] Figure 8 It is a schematic structural diagram of a fifth comparative example current sensor. Compared with the current sensor of the second embodiment, the fifth comparative example current sensor has the following differences: Both the first shielding ring and the second shielding ring do not have openings.

[0059] (1) Apply a Z-axis interference magnetic field of 10 Oe to the current sensors of the second embodiment, the first comparative example, the second comparative example, the third comparative example, the fourth comparative example, and the fifth comparative example respectively, and simulate the magnetic field conditions at the open air gap of each current sensor when the load current is 0 A and 500 A; Apply a Z-axis interference magnetic field of 10 Oe to the current sensors of the fourth comparative example and the fifth comparative example, and simulate the magnetic field conditions around the magnetic sensor when the load current is 0 A; Simulate the magnetic field conditions around the magnetic sensor of the fifth comparative example current sensor when there is no interference magnetic field and the load current is 3 A; When the load current is 0 A, the Z-axis interference magnetic fields at the open air gap positions of the current sensors of the second embodiment, the first comparative example, the second comparative example, the third comparative example, the fourth comparative example, and the fifth comparative example are 2.3759 Oe, 42.345 Oe, 9.4494 Oe, 19.94 Oe, 2.3258 Oe, and 1.7409 Oe respectively.

[0060] When the load current is 500 A, the Z-axis interference magnetic fields at the opening air gap positions in the current sensors of the second embodiment, the first comparative example, the second comparative example, the third comparative example, the fourth comparative example, and the fifth comparative example are 209.57 Oe, 346.37 Oe, 176.32 Oe, 357.06 Oe, 205.7 Oe, and 211.42 Oe respectively.

[0061] Denote the ratio of the induced magnetic field at 0 A to the induced magnetic field at 500 A as the interference / signal value of the current sensor at 500 A. When used for measuring a 500 A load current, the interference / signal values of the current sensors of the second embodiment, the first comparative example, the second comparative example, the third comparative example, the fourth comparative example, and the fifth comparative example are 1.13%, 12.23%, 5.64%, 5.58%, 1.13%, and 1.82% respectively. Among them, the lower the interference / signal value, the better its anti-interference performance.

[0062] On both sides of the magnetic sensing unit in the current sensors of the first comparative example and the third comparative example, since no magnetic conduction sheet pair is provided, their interference / signal values are relatively high, indicating that the setting of the magnetic conduction sheet pair helps to improve their anti-interference ability against the Z-axis interference magnetic field. For the current sensor of the second comparative example, since no shielding ring is provided, its interference / signal value is relatively high, indicating that the setting of the shielding ring helps to improve the anti-interference ability of the current sensor against the Z-axis interference magnetic field. Therefore, the current sensors of the second embodiment, the fourth comparative example, and the fifth comparative example have good anti-interference ability against the Z-axis interference magnetic field.

[0063] Figure 18 It is the simulation diagram of the surrounding magnetic field of the current sensor of the fourth comparative example under a Z-axis interference magnetic field of 10 Oe. As Figure 18 shown, when the external magnetic field in the Z-axis is 10 Oe, the magnetic field around the closed second shielding ring is higher than 20 Oe, and the magnetic field around the magnetic focusing ring is higher than 1 T, causing the magnetic focusing ring to be in a saturated state, and further making the current sensor of the fourth comparative example unsuitable for use as a current sensor.

[0064] Figure 19 It is the simulation diagram of the surrounding magnetic field of the current sensor of the fifth comparative example under a Z-axis interference magnetic field of 10 Oe. As Figure 19 shown, when the Z-axis interference magnetic field is 10 Oe, the magnetic field around the closed second shielding ring is higher than 20 Oe, the magnetic field around the closed first shielding ring is higher than 30 Oe, and the magnetic field around the magnetic focusing ring is higher than 1 T. Under the high magnetic field, the magnetic focusing ring will be in a saturated state, making the current sensor of the fifth comparative example unsuitable for use as a current sensor.

[0065] Although the current sensors of the fourth and fifth comparative examples have an anti-interference effect on external magnetic fields, the closed structure of the shielding ring greatly increases the magnetic field around the magnetic concentrating ring, restricting the use of this type of current sensor. Through simulation, it is found that this type of current sensor is only suitable for measuring currents with a load current of less than 5 A, and it has a relatively small current measurement range.

[0066] Figure 20 Figure for the simulation of the magnetic field around the fifth comparative example current sensor when the load current is 3 A. As Figure 20 shown, when the load current is 3 A, the magnetic field around the second shielding ring is higher than 350 Oe, the magnetic field around the first shielding ring is as high as 500 Oe, and the magnetic field around the magnetic concentrating ring is lower than 100 Oe. This indicates that the fifth comparative example current sensor is suitable for measuring a current with a load current of 3 A.

[0067] Therefore, compared with each comparative example current sensor, the current sensor of the second embodiment has both a wide current range and good anti-interference performance.

[0068] (2) Apply load currents to the current-carrying wires to be measured in the current sensors of the second embodiment and the first comparative example respectively, and gradually increase the load current from 0 A to 600 A, and observe the changes in the magnetic fields induced by the magnetic-sensitive units in the current sensors of the second embodiment and the first comparative example.

[0069] Figure 9 Figure for the variation curve of the magnetic field at the air gap with the load current in the current sensors of the second embodiment and the first comparative example.

[0070] According to Figure 9 , the magnetic field at the air gap in the current sensors of the second embodiment and the first comparative example changes linearly with the load current, and the current sensor of the second embodiment has a higher sensitivity. The magnetic field at the air gap in the current sensor of the second embodiment is higher than that in the current sensor of the first comparative example. When the load current of the current-carrying wire to be measured is 500 A, the magnetic field induced by the magnetic-sensitive unit in the first comparative example current sensor, that is, the magnetic field at the open air gap, is 338.76 Oe, and the magnetic field induced by the magnetic-sensitive unit in the current sensor of the second embodiment, that is, the magnetic field at the open air gap, is 209.57 Oe. When magnetic-sensitive units with the same range are respectively applied to the current sensors of the second embodiment and the first comparative example, the range of the current sensor of the second embodiment has been greatly improved.

[0071] (3) Apply a load current of 500 A to the current sensors of the second embodiment, the first comparative example, and the third comparative example respectively, and at the same time apply a Z-axis interference magnetic field, and observe the change in the magnetic field signal induced by the magnetic induction unit as the Z-axis interference magnetic field increases from 0 Oe to 100 Oe.

[0072] Figure 10 The graph shows the variation of the magnetic field at the air gap with the Z-axis interference magnetic field when the load current is 500 A for the current sensors of the second embodiment and the first comparative example.

[0073] Figure 11 The graph shows the variation of the magnetic field at the air gap with the Z-axis interference magnetic field when the load current is 500 A for the magnetic induction units of the second embodiment and the third comparative example.

[0074] According to Figure 10 - 11 , the magnetic field at the air gap of the first and third comparative examples, i.e., the magnetic field sensed by the magnetic sensing unit, is greatly affected by the Z-axis interference magnetic field, and as the interference magnetic field increases, the sensed magnetic field increases linearly; the magnetic field sensed by the magnetic induction unit of the second embodiment is less affected by the Z-axis interference magnetic field, and as the interference magnetic field increases, the sensed magnetic field only increases slightly; this shows that the current sensor of the second embodiment has a good anti-interference effect against the Z-axis interference magnetic field.

[0075] According to Figure 10 - 11 , when the Z-axis interference magnetic field is 0 Oe, the magnetic fields sensed by the magnetic induction units in the current sensors of the second embodiment, the first comparative example, and the second comparative example are 196.75 Oe, 338.76 Oe, and 357.06 Oe respectively, indicating that the magnetic field sensed by the magnetic induction unit in the current sensor of the second embodiment is the smallest, and it has a wider measurement range.

[0076] (4) Apply a -10 Oe X-axis interference magnetic field to the current sensors of the second embodiment, the second comparative example, and the third comparative example, and simulate the magnetic field around the current sensors of the second embodiment and the first comparative example.

[0077] Figure 12 The simulation diagram of the magnetic field around the current sensor of the first comparative example under the X-axis interference magnetic field; Figure 13 The simulation diagram of the magnetic field around the current sensor of the second embodiment under the X-axis interference magnetic field; Figure 22 The simulation diagram of the magnetic field around the current sensor of the third comparative example under the X-axis interference magnetic field.

[0078] According to Figure 12 , Figure 13 and Figure 22, the interference magnetic field near the outer side of the magnetic focusing ring at the opening air gap of the first comparative example current sensor is higher than 10 Oe, and the interference magnetic field near the inner side of the magnetic focusing ring is lower than 10 Oe. The interference magnetic field at the position where the magnetic induction unit is located is related to its placement position; the magnetic field at the opening air gap of the current sensor of the second embodiment is relatively uniform and is lower than 5 Oe; the magnetic field at the opening air gap of the third comparative example current sensor is also relatively uniform and is lower than 5 Oe. The opening air gap positions of the third comparative example current sensor and the current sensor of the second embodiment have a relatively small interference magnetic field. It shows that the third comparative example current sensor and the current sensor of the second embodiment have good anti-interference performance against the X-axis interference magnetic field.

[0079] (5) Apply an X-axis interference magnetic field to the current sensors of the second embodiment and the first comparative example respectively. The X-axis interference magnetic field gradually increases from 0 Oe to 100 Oe, and observe the change of the magnetic field induced by the current sensors of the second embodiment and the first comparative example with the X-axis interference magnetic field.

[0080] Figure 14 It is a graph showing the change of the magnetic field at the air gap with the X-axis interference magnetic field for the current sensors of the second embodiment and the first comparative example when there is no load current.

[0081] When the X-axis interference magnetic field is 20 Oe, the magnetic field at the air gap of the second comparative example current sensor, that is, the Z-axis interference magnetic field induced by the magnetic induction unit, is 8.356 Oe, and the magnetic field at the air gap of the current sensor of the second embodiment, that is, the Z-axis interference magnetic field induced by the magnetic induction unit, is only 0.316 Oe. It shows that the current sensor of the second embodiment has a very good anti-interference effect against the X-axis interference magnetic field.

[0082] (6) Apply a Z-axis interference magnetic field of -10 Oe to the current sensors of the second embodiment, the first comparative example and the third comparative example, and simulate the magnetic field situation around the current sensors of the second embodiment and the first comparative example.

[0083] Figure 15 It is a simulation diagram of the magnetic field around the current sensor of the first comparative example under the Z-axis interference magnetic field; Figure 16 It is a simulation diagram of the magnetic field around the current sensor of the second embodiment under the Z-axis interference magnetic field; Figure 21 It is a simulation diagram of the magnetic field around the current sensor of the third comparative example under the Z-axis interference magnetic field.

[0084] According to Figure 15 , Figure 16 and Figure 21 , when applying a Z-axis interference magnetic field of 10 Oe, the first comparative example current sensor according to Figure 15, when applying a Z-axis interference magnetic field of 10 Oe, the magnetic field at the opening air gap of the first pair of proportional current sensors is higher than 40 Oe and much higher than the magnetic field around it, and the magnetic field at the opening air gap of the third pair of proportional current sensors is higher than 10 Oe and slightly higher than the magnetic field around it, and it has no shielding effect on the Z-axis interference magnetic field; while the magnetic field at the opening air gap of the current sensor in the second embodiment is lower than 5 Oe, indicating that the current sensor in the second embodiment has a good anti-interference effect on the Z-axis interference magnetic field.

[0085] (7) Apply a Z-axis interference magnetic field to the current sensors of the second embodiment and the first comparative example respectively, and gradually increase the Z-axis interference magnetic field from 0 Oe to 100 Oe, and observe the change of the magnetic field induced by the current sensors of the second embodiment and the first comparative example with the Z-axis interference magnetic field.

[0086] Figure 17 It is a graph showing the change of the magnetic field at the air gap with the Z-axis interference magnetic field for the current sensors of the second embodiment and the first comparative example when there is no load current. When the interference magnetic field is 20 Oe, the magnetic field at the air gap of the second pair of proportional current sensors, that is, the air gap magnetic field induced by the magnetic induction unit, is 89.065 Oe, and the magnetic field at the air gap of the current sensor in the second embodiment, that is, the air gap magnetic field induced by the magnetic induction unit, is 4.962 Oe. It shows that the current sensor in the second embodiment has a good anti-interference effect on the Z-axis interference magnetic field.

[0087] (8) Adjust the thicknesses of the first shielding ring and the second shielding ring in the current sensor of the second embodiment to 8 mm, 16 mm, and 24 mm, apply a Z-axis interference magnetic field of -10 Oe to each current sensor, and simulate the magnetic field at the opening air gap when the load currents are 0 A and 500 A respectively.

[0088] According to the simulation results, for the current sensor with the thickness of the first shielding ring being 8 mm, the magnetic field at the open air gap is 4.6269 Oe when the load current is 0 A, and the magnetic field at the open air gap is 183.47 Oe when the load current is 500 A, and its interference / signal value is 2.52%; for the current sensor with the thickness of the first shielding ring being 16 mm, the magnetic field at the open air gap is 3.0116 Oe when the load current is 0 A, and the magnetic field at the open air gap is 197.7 Oe when the load current is 500 A, and its interference / signal value is 1.52%; for the current sensor with the thickness of the first shielding ring being 24 mm, the magnetic field at the open air gap is 2.2653 Oe when the load current is 0 A, and the magnetic field at the open air gap is 213 Oe when the load current is 500 A, and its interference / signal value is 1.06%. It shows that the increase in the thickness of the shielding ring is beneficial to improving the anti-interference effect of the current sensor. Since the increase in the thickness of the shielding ring is likely to increase the manufacturing cost of the current sensor and affect the miniaturization of the current sensor, the thickness of the shielding ring is preferably 10 - 25 mm.

[0089] (9)Adjust the distances between the first shielding ring and the second shielding ring in the current sensor of the second embodiment to be 1 mm, 2 mm, 10 mm, and 20 mm, and apply a Z-axis interference magnetic field of 10 Oe to each current sensor, and simulate the magnetic fields at the open air gaps when the load currents are 0 A and 500 A respectively.

[0090] According to the simulation results, for the current sensor with a distance of 1 mm between the first shielding ring and the second shielding ring, the magnetic field at the open air gap is 2.2888 Oe when the load current is 0 A, and 207.58 Oe when the load current is 500 A, and its interference / signal value is 1.10%; for the current sensor with a distance of 2 mm between the first shielding ring and the second shielding ring, the magnetic field at the open air gap is 2.2557 Oe when the load current is 0 A, and 200.31 Oe when the load current is 500 A, and its interference / signal value is 1.12%; for the current sensor with a distance of 10 mm between the first shielding ring and the second shielding ring, the magnetic field at the open air gap is 2.8059 Oe when the load current is 0 A, and 197.31 Oe when the load current is 500 A, and its interference / signal value is 1.42%; for the current sensor with a distance of 20 mm between the first shielding ring and the second shielding ring, the magnetic field at the open air gap is 3.0821 Oe when the load current is 0 A, and 206.13 Oe when the load current is 500 A, and its interference / signal value is 1.54%. It shows that the reduction of the shielding ring distance is beneficial to improving the anti-interference effect of the current sensor. The increase of the shielding ring distance is not conducive to the miniaturization of the current sensor, and the reduction of the shielding ring distance is not conducive to the manufacturing process of the shielding ring. Therefore, the distance between the first shielding ring and the second shielding ring is preferably 2 - 20 mm.

[0091] An embodiment of the present invention further provides an electronic device, which includes a first wire and a current sensor for measuring the current of the first wire. The current sensor is the current sensor of any of the foregoing embodiments, and the current sensor will not be specifically described here.

[0092] Therefore, the embodiment of the present invention has at least the following beneficial effects: The current sensor provided by the embodiment of the present invention includes a magnetic focusing ring, a magnetic induction module and a shielding module; the magnetic focusing ring has an open air gap for concentrating and amplifying the induced magnetic field generated by the current-carrying wire to be measured passing through the magnetic focusing ring; the magnetic induction module is located in the open air gap for sensing the induced magnetic field and outputting an electrical signal related to the load current of the current-carrying wire to be measured; the shielding module includes a first shielding ring externally provided on the magnetic ring structure and a second shielding ring externally provided on the first shielding ring; the opening of the first shielding ring faces the open air gap directly, and the opening of the second shielding ring forms a first included angle with the opening of the first shielding ring. Through the synergistic effect of the magnetic induction module, the first shielding ring and the second shielding ring, the current sensor of the present invention realizes high sensitivity, wide range and good anti-interference effect in a complex electromagnetic interference environment for current measurement.

[0093] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A current sensor, characterized in that, Comprising: A magnetic concentrating ring having at least one open air gap for concentrating and amplifying the induced magnetic field generated by a current-carrying wire under test passing through the magnetic concentrating ring; A magnetic induction module including at least one magnetic induction unit and at least one pair of magnetic conduction sheets for sensing the air gap magnetic field in the open air gap and outputting an electrical signal related to the load current of the current-carrying wire under test; The magnetic induction unit is located in the open air gap, and the pair of magnetic conduction sheets is located on both sides of the magnetic induction unit along the penetration direction of the current-carrying wire under test; A shielding module including a first shielding ring externally provided on the magnetic concentrating ring and a second shielding ring externally provided on the first shielding ring; the opening of the first shielding ring faces the open air gap directly; the opening of the second shielding ring is offset by a certain angle from the opening of the first shielding ring.

2. The current sensor according to claim 1, wherein: The magnetic field direction of the air gap magnetic field is perpendicular to the penetration direction; The magnetic induction unit is magnetically sensitive to the air gap magnetic field.

3. The current sensor according to claim 2, wherein: The magnetic induction module further includes a magnetic field conversion unit for converting the magnetic field component in the direction of the air gap magnetic field into an in-plane magnetic field component orthogonal to the magnetic field direction of the air gap magnetic field and then applying it to the magnetic induction unit; The magnetic induction unit has a magnetic sensitive direction in the plane.

4. The current sensor according to claim 2, wherein: The magnetic induction unit includes a substrate and a first magnetoresistive element, a second magnetoresistive element, a third magnetoresistive element, and a fourth magnetoresistive element deposited above the substrate and coupled to each other. The first magnetoresistive element, the second magnetoresistive element, the third magnetoresistive element, and the fourth magnetoresistive element are coupled to each other to form a Wheatstone bridge structure; the first magnetoresistive element and the third magnetoresistive element have a first magnetic sensitive direction in the plane, and the second magnetoresistive element and the fourth magnetoresistive element have a second magnetic sensitive direction in the plane that is antiparallel to the first magnetic sensitive direction; The magnetic induction unit further includes a plurality of soft magnetic blocks for converting the magnetic field component of the air gap magnetic field into an in-plane magnetic field component and then applying it to the first magnetoresistive element, the second magnetoresistive element, the third magnetoresistive element, and the fourth magnetoresistive element.

5. The current sensor according to claim 1, wherein: The thickness of the first shielding ring and the second shielding ring along the penetration direction is at least 2 times the thickness of the magnetic concentrating ring along the penetration direction; The opening of the second shielding ring is at an angle of 30° to 150° with the opening of the first shielding ring.

6. The current sensor according to claim 5, wherein: The thickness of the magnetic concentrating ring and the magnetic conduction sheet along the penetration direction is 8 mm; The thickness of the first shielding ring and the second shielding ring along the penetration direction is 20 mm; The opening of the second shielding ring is at an angle of 90° with the opening of the first shielding ring.

7. The current sensor according to claim 1, wherein: The distance between the magnetic concentrating ring and the first shielding ring is greater than 10 mm; The distance between the second shielding ring and the first shielding ring is greater than 2 mm.

8. The current sensor according to claim 7, wherein the distance between the magnetic focusing ring and the first shielding ring is less than 25 mm; the distance between the second shielding ring and the first shielding ring is less than 20 mm.

9. The current sensor according to claim 1, wherein the magnetic focusing ring has a first open air gap and a second open air gap, and the first open air gap and the second open air gap are symmetrically distributed along the center of the magnetic focusing ring; the at least one magnetic induction unit includes a first magnetic induction unit and a second magnetic induction unit, the first magnetic induction unit is located in the first open air gap, and the second magnetic induction unit is located in the second open air gap; the first shielding ring has an opening one and an opening two, the opening one faces the first open air gap; the opening two faces the second open air gap; the second shielding ring has an opening three and an opening four, the opening three forms a first angle with the opening one, and the opening four forms the first angle with the opening two; the first angle is 30 to 150 degrees.

10. An electronic device, characterized in that, A current sensor including a first wire and configured to measure the current in the first wire, wherein the current sensor is the current sensor according to any one of claims 1-9.

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