Current sensor

Abstract

The invention relates to a current sensor, which comprises a magnetic core, a mounting piece and a magnetic field detector, and is characterized in that the magnetic core is provided with an air gap; the mounting piece comprises a first abutting part, a second abutting part and a mounting part, the first abutting part and the second abutting part are both connected with the mounting part, the first abutting part and the second abutting part are arranged in a spaced mode in the first direction of the current sensor, the magnetic core is provided with a first side face and a second side face which are oppositely arranged, the first abutting part abuts against the first side face, and the second abutting part abuts against the second side face. The second abutting part abuts against the second side face. The magnetic field detector is located in the air gap and connected with the installation part. Compared with the prior art, the current sensor clamps the magnetic core through the first abutting part and the second abutting part which are arranged on the mounting part at an interval, and meanwhile, the magnetic field inductor on the mounting part is arranged in the air gap of the magnetic core, so that the current sensor is assembled, too high machining precision is not needed, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sensors, and in particular to a current sensor. Background Art

[0002] A current sensor is a device used to detect information such as the current size in a conductor to be measured. When using a current sensor, the conductor to be measured needs to be placed in the detection area of ​​the current sensor. When current flows through the conductor to be measured, a magnetic field is generated around the conductor to be measured. Under the action of the magnetic field, the magnetic core of the current sensor gathers the magnetic lines of force at the air gap of the magnetic core. The magnetic field detection mechanism can detect the magnetic induction intensity at the air gap, and infer the current size flowing through the conductor to be measured based on the magnitude of the magnetic induction intensity, thereby realizing the detection of the current size of the conductor to be measured.

[0003] In the conventional technology, the magnetic field detection mechanism is provided with at least two extensions, and the magnetic core is provided with at least two openings corresponding to the extensions one by one, and the extensions pass through the corresponding openings to realize the assembly between the magnetic field detection mechanism and the magnetic core; however, this connection method usually requires higher processing accuracy. When the position or shape of the extension does not match the position or shape of the opening, it is difficult for the extension to pass through the opening, resulting in a low production yield of the current sensor and increased production costs. Summary of the invention

[0004] Based on this, it is necessary to provide a current sensor to address the problem that the production yield of current sensors in traditional technologies is low, which leads to increased production costs.

[0005] The technical solution is as follows:

[0006] One embodiment provides a current sensor, comprising:

[0007] A magnetic core, wherein the magnetic core is provided with an air gap;

[0008] a mounting member, the mounting member comprising a first abutting portion, a second abutting portion and a mounting portion, the first abutting portion and the second abutting portion are both connected to the mounting portion, the first abutting portion and the second abutting portion are arranged at intervals along a first direction of the current sensor, the magnetic core has a first side surface and a second side surface arranged opposite to each other, the first abutting portion abuts against the first side surface, and the second abutting portion abuts against the second side surface; and

[0009] A magnetic field detector is located in the air gap and connected to the mounting portion.

[0010] In the above-mentioned current sensor, the first abutting portion and the second abutting portion arranged at intervals on the mounting portion are respectively used to abut the first side surface and the second side surface of the magnetic core. In this way, when the current sensor is assembled, the magnetic core is clamped between the first abutting portion and the second abutting portion of the mounting portion, and the magnetic field sensor on the mounting portion is correspondingly arranged in the air gap of the magnetic core to complete the assembly; compared with the traditional technology, the above-mentioned current sensor clamps the magnetic core through the first abutting portion and the second abutting portion arranged at intervals on the mounting portion, and the magnetic field sensor on the mounting portion is placed in the air gap of the magnetic core to realize the assembly of the current sensor, without the need for excessively high processing precision, thereby reducing production costs.

[0011] In one embodiment, the first abutting portion and the second abutting portion are protrudingly arranged on the surface of the same side of the mounting portion, the mounting portion extends along the second direction of the current sensor and crosses the air gap, and at least two first abutting portions are provided and are spaced apart on the mounting portion along the second direction, wherein at least one of the first abutting portions abuts against the first side surface located on one side of the air gap along the second direction, and at least one of the first abutting portions abuts against the first side surface located on the other side of the air gap along the second direction; at least two second abutting portions are provided and are spaced apart on the mounting portion along the second direction, wherein at least one of the second abutting portions abuts against the second side surface located on one side of the air gap along the second direction, and at least one of the second abutting portions abuts against the second side surface located on the other side of the air gap along the second direction.

[0012] At least one first abutment portion and at least one second abutment portion can clamp the side of the magnetic core located in the air gap along the second direction. At the same time, at least one first abutment portion and at least one second abutment portion can clamp the other side of the magnetic core located in the air gap along the second direction to improve the assembly stability and reliability between the mounting part and the magnetic core.

[0013] In one embodiment, the current sensor further includes a circuit board, the magnetic field detector is electrically connected to the circuit board, and the mounting member further includes a grounding unit, the grounding unit is electrically connected to the mounting portion and to the circuit board.

[0014] The magnetic core passes through the first abutment portion, the second abutment portion, the mounting portion, the grounding unit and the circuit board in sequence. The circuit board can be connected to the external terminal to achieve grounding of the magnetic core. Grounding of the magnetic core can not only ensure the operational safety of the current sensor, but also prevent electromagnetic interference to a certain extent, thereby improving the detection accuracy of the current sensor.

[0015] In one embodiment, the grounding unit includes a first grounding terminal and a second grounding terminal, the first grounding terminal and the second grounding terminal are both protruding from the surface of the same side of the mounting portion, the first grounding terminal and the second grounding terminal are spaced apart along the thickness direction of the circuit board, the first grounding terminal abuts against one side of the circuit board, and the second grounding terminal abuts against the other side of the circuit board.

[0016] The first grounding terminal and the second grounding terminal are respectively abutted against two opposite surfaces of the circuit board, which can not only realize the electrical connection with the circuit board and thus realize the grounding of the magnetic core, but also play a certain positioning role on the circuit board to prevent the circuit board from being displaced and driving the magnetic field detector to move in the air gap, thereby affecting the detection accuracy of the current sensor.

[0017] In one embodiment, one end of the first grounding terminal and one end of the second grounding terminal are both arranged on the surface of the same side of the mounting portion, the other end of the first grounding terminal is provided with a first abutment protrusion, and the other end of the second grounding terminal is provided with a second abutment protrusion, the first abutment protrusion and the second abutment protrusion are arranged opposite to each other, and the circuit board is clamped between the first abutment protrusion and the second abutment protrusion.

[0018] The first abutting protrusion and the second abutting protrusion can not only improve the stability of the electrical connection between the grounding unit and the circuit board, but also improve the positioning stability of the first grounding terminal and the second grounding terminal with respect to the circuit board.

[0019] In one of the embodiments, the current sensor further comprises a shell having a mounting cavity, and the magnetic core, the mounting member, the magnetic field detector and the circuit board are all located in the mounting cavity.

[0020] The shell can play a certain protective role on the mounting parts, magnetic field detectors and circuit boards placed in the mounting cavity, preventing external devices from bumping and damaging the components in the mounting cavity.

[0021] In one of the embodiments, the shell is provided with a connecting channel, the connecting channel is communicated with the installation cavity, and one side of the circuit board is provided with a pin, and the pin is inserted into the connecting channel.

[0022] The pins of the circuit board pass through the connecting channels of the shell to achieve electrical connection between the pins and external terminals, thereby realizing functions such as information transmission, grounding and power supply to the circuit board.

[0023] In one embodiment, a first positioning portion and a second positioning portion are further provided in the installation cavity, the first positioning portion and the second positioning portion are arranged opposite to each other, the first positioning portion is provided with a connecting through hole, the connecting through hole is communicated with the connecting channel, the first positioning portion abuts against a side of the circuit board where the pin is provided, the pin is sequentially passed through the connecting through hole and the connecting channel, and the second positioning portion abuts against a side of the circuit board away from the pin.

[0024] The first positioning portion and the second positioning portion in the installation cavity are arranged relatively to each other so that the circuit board is clamped between the first positioning portion and the second positioning portion. At the same time, the connecting through hole on the first positioning portion is connected to the connecting channel of the shell, and the pins can be sequentially inserted into the connecting through hole and the connecting channel on the first positioning portion, so as to realize the electrical connection between the pins and the external terminals; with such an arrangement, while realizing the functions of information transmission, grounding and power supply to the circuit board, the circuit board can also be positioned to prevent the circuit board from moving in the installation cavity and affecting the detection accuracy of the current sensor.

[0025] In one embodiment, the circuit board is provided with a first assembly groove, and the magnetic field detector is located in the first assembly groove.

[0026] By opening the first assembly groove on the circuit board, a position for installing the magnetic field detector is vacated, the internal space of the installation cavity is saved, and the overall structure of the current sensor is made more compact.

[0027] In one embodiment, the circuit board is provided with a second assembly groove, and the shape of the second assembly groove matches the shape of the mounting portion.

[0028] By opening a second assembly groove on the circuit board, space for accommodating the mounting part is freed up. When the circuit board is electrically connected to the mounting part through the grounding unit, the second assembly groove on the circuit board matches the mounting part, saving the internal space of the mounting cavity and making the overall structure of the current sensor more compact.

[0029] In one of the embodiments, the magnetic core is formed by winding a sheet material around a preset direction to form a detection channel inside the magnetic core.

[0030] The sheet is wound around a preset direction to form a magnetic core, and a detection channel is formed inside the magnetic core for the wire to be tested to pass through, so that the magnetic core is composed of multiple layers of sheets along the radial direction of the detection channel, that is, the first direction; in this way, the first abutting portion and the second abutting portion can clamp the magnetic core along the radial direction of the detection channel, so that the sheets fit more closely, the noise of the magnetic core is lower, and the magnetic flux distribution is more uniform, thereby improving the detection accuracy of the current sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] FIG. 1 is a schematic diagram of a magnetic core, a mounting member, a magnetic field detector, and a circuit board after being assembled in one embodiment of the present application.

[0033] FIG. 2 is a top view of the magnetic core, the mounting member, the magnetic field detector and the circuit board after being assembled in one embodiment of the present application.

[0034] FIG3 is a schematic diagram of a magnetic field detector, a circuit board, and a mounting member after assembly in one embodiment of the present application.

[0035] FIG. 4 is a schematic diagram of a magnetic field detector and a circuit board after being assembled in one embodiment of the present application.

[0036] FIG. 5 is a schematic diagram of the structure of a mounting member in an embodiment of the present application.

[0037] FIG. 6 is a schematic diagram of the winding of a magnetic core in an embodiment of the present application.

[0038] FIG. 7 is an exploded view of a current sensor in an embodiment of the present application.

[0039] FIG8 is a schematic diagram of the external structure of a current sensor in an embodiment of the present application.

[0040] FIG. 9 is a schematic diagram of a magnetic core, a mounting member, a magnetic field detector, and a circuit board installed in a housing in an embodiment of the present application.

[0041] FIG. 10 is a partial enlarged view of point A in FIG. 9 .

[0042] FIG. 11 is a schematic diagram of the structure of the installation cavity in one embodiment of the present application.

[0043] FIG. 12 is a partial enlarged view of point B in FIG. 10 .

[0044] Notes on the attached drawings:

[0045] 100, magnetic core; 110, air gap; 120, detection channel; 130, sheet; 141, first side; 142, second side; 200, mounting member; 210, first abutting portion; 220, second abutting portion; 230, first clamping unit; 240, second clamping unit; 250, grounding unit; 251, first grounding terminal; 252, second grounding terminal; 253, first abutting protrusion; 254, second abutting protrusion; 260, mounting portion; 300, magnetic field detector; 400, circuit board; 410, pin; 420, first assembly groove; 430, second assembly groove; 500, shell; 510, mounting cavity; 520, detection through hole; 530, connecting channel; 540, first positioning portion; 541, connecting through hole; 550, second positioning portion. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0052] Please refer to Figures 1 to 5. An embodiment of the present application provides a current sensor, including a magnetic core 100, a mounting member 200 and a magnetic field detector 300. The magnetic core 100 is provided with an air gap 110; the mounting member 200 includes a first abutting portion 210, a second abutting portion 220 and a mounting portion 260, the first abutting portion 210 and the second abutting portion 220 are both connected to the mounting portion 260, the first abutting portion 210 and the second abutting portion 220 are spaced apart along a first direction of the current sensor (i.e., direction A in Figures 2, 3 and 5), the magnetic core 100 has a first side surface 141 and a second side surface 142 disposed opposite to each other, the first abutting portion 210 abuts against the first side surface 141, and the second abutting portion 220 abuts against the second side surface 142; the magnetic field detector 300 is located in the air gap 110 and is connected to the mounting portion 260.

[0053] In the above-mentioned current sensor, the first abutting portion 210 and the second abutting portion 220 spaced apart on the mounting portion 260 are respectively used to abut the first side surface 141 and the second side surface 142 of the magnetic core 100. In this way, when the current sensor is assembled, the magnetic core 100 is clamped between the first abutting portion 210 and the second abutting portion 220 of the mounting portion 260, and the magnetic field detector 300 on the mounting portion 260 is correspondingly arranged in the air gap 110 of the magnetic core 100 to complete the assembly; compared with the conventional technology, the above-mentioned current sensor clamps the magnetic core 100 by the first abutting portion 210 and the second abutting portion 220 spaced apart on the mounting portion 260, and the magnetic field detector 300 on the mounting portion 260 is placed in the air gap 110 of the magnetic core 100 to realize the assembly of the current sensor.

[0054] It is worth mentioning that before assembly, that is, before the magnetic core 100 is clamped between the first abutting portion 210 and the second abutting portion 220 of the mounting portion 260, the spacing dimension between the first abutting portion 210 and the second abutting portion 220 is smaller than the thickness dimension between the first side surface 141 and the second side surface 142. Even if there is a manufacturing error resulting in different thickness dimensions between the first side surface 141 and the second side surface 142 of each magnetic core 100, or different spacing dimensions between the first abutting portion 210 and the second abutting portion 220 of each mounting member 200, after assembly, only the different clamping forces of the first abutting portion 210 and the second abutting portion 220 on the magnetic core 100 are affected. However, assembly can be carried out smoothly, so there is no need for excessively high processing precision, which is beneficial to reducing production costs.

[0055] In one embodiment, the magnetic core 100 is annular and is provided with a detection channel 120. The first direction of the current sensor refers to the radial direction of the detection channel 120 (it can also be understood as the radial direction of the magnetic core 100, that is, the A direction in Figures 2, 3 and 5). The first abutment portion 210 and the second abutment portion 220 are arranged at intervals along the first direction of the magnetic core 100. In this way, the first abutment portion 210 abuts against the first side surface 141 of the magnetic core 100, that is, the inner annular surface of the magnetic core 100, and the second abutment portion 220 abuts against the second side surface 142 of the magnetic core 100, that is, the outer annular surface of the magnetic core 100, so that the magnetic core 100 is clamped by the first abutment portion 210 and the second abutment portion 220 on the mounting portion 260, thereby realizing the assembly between the magnetic core 100 and the magnetic field detector 300 on the mounting portion 260.

[0056] Further, referring to FIG. 2 and FIG. 6 , the air gap 110 is opened along the radial direction of the magnetic core 100 and communicates with the detection channel 120 . The detection channel 120 runs through the inner and outer annular surfaces of the magnetic core 100 to accommodate the magnetic field detector 300 .

[0057] Please refer to Figures 1 to 3 and 5. In one embodiment, the mounting portion 260 is plate-shaped, the first abutting portion 210 and the second abutting portion 220 are spaced apart and arranged on the same side of the plate-shaped mounting portion 260, and the magnetic field detector 300 is also arranged on the mounting portion 260. When the first abutting portion 210 and the second abutting portion 220 clamp the magnetic core 100, the magnetic field detector 300 is just located in the air gap 110 to realize the detection of the current of the conductor to be measured.

[0058] Furthermore, when a conductor to be measured (such as a wire) carrying current is passed into the detection channel 120 of the magnetic core 100, a magnetic field is generated around the conductor to be measured, and the magnetic core 100 gathers the magnetic lines of force at the air gap 110 of the magnetic core 100. The magnetic field detector 300 can detect the magnetic induction intensity at the air gap 110, and reversely infer the magnitude of the current passed through the conductor to be measured based on the magnitude of the magnetic induction intensity, thereby realizing the detection of the magnitude of the current of the conductor to be measured.

[0059] In one embodiment, the magnetic field detector 300 includes but is not limited to a Hall effect sensor, a magnetic induction sensor, a magnetic force sensor, a magnetoresistive sensor, and the like.

[0060] Please refer to FIG. 6 . In one embodiment, the magnetic core 100 is formed by winding a sheet 130 around a preset direction to form a detection channel 120 inside the magnetic core 100 .

[0061] The sheet 130 is wound around a preset direction to form a magnetic core 100, and a detection channel 120 is formed inside the magnetic core 100 for the wire to be tested to pass through, so that the magnetic core 100 is composed of multiple layers of sheets 130 along the radial direction of the detection channel 120, that is, the first direction; in this way, the first abutment portion 210 and the second abutment portion 220 can clamp the magnetic core 100 along the first direction, so that the sheets 130 fit more closely, the noise of the magnetic core 100 is lower, and the magnetic flux distribution is more uniform, thereby improving the detection accuracy of the current sensor.

[0062] Furthermore, compared to the stacked magnetic core 100, the sheets 130 located in different layers in the magnetic core 100 formed by winding the sheets 130 can fit more closely, and the first abutment portion 210 and the second abutment portion 220 can clamp the magnetic core 100 in the thickness direction, thereby further improving the tightness between the sheets 130 located in different layers in the magnetic core 100, so that the noise of the magnetic core 100 is lower and the magnetic flux distribution is more uniform.

[0063] For explanation, the preset direction in the above embodiment may be a clockwise direction or a counterclockwise direction, which is not specifically limited here.

[0064] In one embodiment, the sheet material 130 used for winding to form the magnetic core 100 is a silicon steel sheet. After the silicon steel sheet is wound along a preset direction to form the magnetic core 100, it is cut using a grinding wheel to form an air gap 110. In the embodiment shown in FIG6 , the portion of the magnetic core 100 that is cut using a grinding wheel is located exactly at the starting point and the ending point of the winding of the silicon steel sheet. Therefore, FIG6 does not show the starting point and the ending point of the winding of the silicon steel sheet.

[0065] Please refer to Figures 2 and 3. In one embodiment, the first abutting portion 210 and the second abutting portion 220 are protrudingly disposed on the surface of the same side of the mounting portion 260. The mounting portion 260 extends along the second direction of the current sensor (i.e., direction B in Figures 2, 3 and 5) and crosses the air gap 110. The first abutting portion 210 is provided with at least two and is spaced apart on the mounting portion 260 along the second direction, wherein at least one first abutting portion 210 abuts against the first side surface 141 located on one side of the air gap 110 along the second direction, and at least one first abutting portion 210 abuts against the first side surface 141 located on the other side of the air gap 110 along the second direction; the second abutting portion 220 is provided with at least two and is spaced apart on the mounting portion 260 along the second direction, wherein at least one second abutting portion 220 abuts against the second side surface 142 located on one side of the air gap 110 along the second direction, and at least one second abutting portion 220 abuts against the second side surface 142 located on the other side of the air gap 110 along the second direction.

[0066] At least one first abutment portion 210 and at least one second abutment portion 220 can clamp the side of the magnetic core 100 located in the air gap 110 along the second direction. At the same time, at least one first abutment portion 210 and at least one second abutment portion 220 can clamp the other side of the magnetic core 100 located in the air gap 110 along the second direction to improve the assembly stability and reliability between the mounting member 200 and the magnetic core 100.

[0067] For explanation, in the above embodiments, the second direction of the current sensor refers to the width direction of the air gap 110 (ie, direction B in FIGS. 2 , 3 and 5 ), and the mounting portion 260 extends along the width direction of the air gap 110 and is arranged across the air gap 110 .

[0068] Please refer to Figures 2 and 5. In one embodiment, two first abutting portions 210 and two second abutting portions 220 are provided, wherein one first abutting portion 210 and one second abutting portion 220 constitute a first clamping unit 230, and another first abutting portion 210 and another second abutting portion 220 constitute a second clamping unit 240. The first clamping unit 230 and the second clamping unit 240 are respectively arranged at opposite ends of the mounting portion 260 along the second direction, so that the first clamping unit 230 clamps the magnetic core 100 on one side of the air gap 110 along the second direction, and the second clamping unit 240 clamps the magnetic core 100 on the other side of the air gap 110 along the second direction. The implementation cost is low and the assembly process is reliable.

[0069] Please refer to FIG. 5 . In one embodiment, the first abutting portion 210 and the second abutting portion 220 are both in sheet shape. The first abutting portion 210 and the second abutting portion 220 are bent to clamp the magnetic core 100 more firmly.

[0070] Referring to FIGS. 1 to 5 , in one embodiment, the current sensor further includes a circuit board 400 , the magnetic field detector 300 is electrically connected to the circuit board 400 , and the mounting member 200 further includes a grounding unit 250 , which is electrically connected to the mounting portion 260 and to the circuit board 400 .

[0071] The magnetic core 100 passes through the first abutment portion 210 and the second abutment portion 220, the mounting portion 260, the grounding unit 250 and the circuit board 400 in sequence. The circuit board 400 can be connected to the external terminal to achieve the grounding of the magnetic core 100. The grounding of the magnetic core 100 can not only ensure the operating safety of the current sensor, but also prevent electromagnetic interference to a certain extent, thereby improving the detection accuracy of the current sensor.

[0072] Furthermore, the mounting member 200 is entirely made of conductive material, thereby achieving electrical connection between the magnetic core 100 and the circuit board 400 . The circuit board 400 can be connected to external wiring terminals, thereby finally achieving grounding of the magnetic core 100 .

[0073] Please refer to Figures 3 and 5. In one embodiment, the grounding unit 250 includes a first grounding terminal 251 and a second grounding terminal 252. The first grounding terminal 251 and the second grounding terminal 252 are both protruding from the surface of the same side of the mounting portion 260. The first grounding terminal 251 and the second grounding terminal 252 are spaced apart along the thickness direction of the circuit board 400. The first grounding terminal 251 abuts against one side of the circuit board 400, and the second grounding terminal 252 abuts against the other side of the circuit board 400.

[0074] The first grounding terminal 251 and the second grounding terminal 252 are respectively abutted against two opposite surfaces of the circuit board 400, which can not only realize the electrical connection with the circuit board 400 and thus realize the grounding of the magnetic core 100, but also play a certain positioning role on the circuit board 400, thereby preventing the circuit board 400 from being displaced and driving the magnetic field detector 300 to move in the air gap 110, thereby affecting the detection accuracy of the current sensor.

[0075] Please refer to Figure 5. In one embodiment, one end of the first grounding terminal 251 and one end of the second grounding terminal 252 are both arranged on the surface of the same side of the mounting portion 260, the other end of the first grounding terminal 251 is provided with a first abutting protrusion 253, and the other end of the second grounding terminal 252 is provided with a second abutting protrusion 254. The first abutting protrusion 253 and the second abutting protrusion 254 are arranged opposite to each other, and the circuit board 400 is clamped between the first abutting protrusion 253 and the second abutting protrusion 254.

[0076] The first abutting protrusion 253 and the second abutting protrusion 254 can not only improve the stability of the electrical connection between the grounding unit 250 and the circuit board 400 , but also improve the positioning stability of the first grounding terminal 251 and the second grounding terminal 252 on the circuit board 400 .

[0077] Furthermore, the first grounding terminal 251 and the second grounding terminal 252 are located between the first clamping unit 230 and the second clamping unit 240. Thus, when the first grounding terminal 251 and the second grounding terminal 252 are electrically connected to the circuit board 400, the circuit board 400 is located just at the air gap 110 of the magnetic core 100, so that the magnetic field detection element is located in the air gap 110.

[0078] Please refer to FIG. 7 and FIG. 8 . In one embodiment, the current sensor further includes a housing 500 having a mounting cavity 510 . The magnetic core 100 , the mounting member 200 , the magnetic field detector 300 and the circuit board 400 are all located in the mounting cavity 510 .

[0079] The housing 500 can provide a certain degree of protection for the mounting member 200 , the magnetic field detector 300 and the circuit board 400 placed in the mounting cavity 510 , thereby preventing external devices from bumping against and damaging the components in the mounting cavity 510 .

[0080] Furthermore, the housing 500 is also provided with a detection through hole 520 corresponding to the detection channel 120 , so that when the magnetic core 100 is located in the installation cavity 510 , the current of the conductor to be tested can be detected through the detection through hole 520 .

[0081] Please refer to FIGS. 7 and 8 . In one embodiment, the housing 500 is provided with a connecting channel 530 . The connecting channel 530 is communicated with the mounting cavity 510 . A pin 410 is provided on one side of the circuit board 400 . The pin 410 is passed through the connecting channel 530 .

[0082] The pins 410 of the circuit board 400 pass through the connection channels 530 of the housing 500 to achieve electrical connection between the pins 410 and external terminals, thereby achieving functions such as information transmission, grounding, and power supply to the circuit board 400.

[0083] In addition, after the mounting member 200, the magnetic field detector 300 and the circuit board 400 are assembled in the mounting cavity 510, the user can directly connect the external terminal to the pin 410 through the connecting channel 530 on the shell 500. The side wall of the connecting channel 530 can also play a certain limiting and guiding role for the external terminal, thereby improving the user experience.

[0084] Furthermore, there are multiple pins 410 on the circuit board 400 to realize different functions of the circuit board 400. For example, in the embodiment shown in Figure 3, there are four pins 410, one pin 410 is used to connect the positive pole of the power supply, one pin 410 is used to connect the negative pole of the power supply, one pin 410 is used to output a signal, and one pin 410 is used to control or adjust the magnetic field detector 300 on the circuit board 400.

[0085] Please refer to Figures 9 to 12. In one embodiment, a first positioning portion 540 and a second positioning portion 550 are further provided in the installation cavity 510. The first positioning portion 540 and the second positioning portion 550 are arranged opposite to each other. The first positioning portion 540 is provided with a connecting through hole 541, and the connecting through hole 541 is connected to the connecting channel 530. The first positioning portion 540 abuts against a side of the circuit board 400 where the pin 410 is provided. The pin 410 is sequentially inserted into the connecting through hole 541 and the connecting channel 530, and the second positioning portion 550 abuts against a side of the circuit board 400 away from the pin 410.

[0086] The first positioning portion 540 and the second positioning portion 550 in the installation cavity 510 are arranged relative to each other to clamp the circuit board 400 between the first positioning portion 540 and the second positioning portion 550. At the same time, the connecting through hole 541 on the first positioning portion 540 is connected to the connecting channel 530 of the shell 500, and the pin 410 can be sequentially passed through the connecting through hole 541 and the connecting channel 530 on the first positioning portion 540, so as to realize the electrical connection between the pin 410 and the external terminal; such a configuration can realize the functions of information transmission, grounding and power supply of the circuit board 400, and at the same time, the circuit board 400 can also be positioned to prevent the circuit board 400 from moving in the installation cavity 510 and affecting the detection accuracy of the current sensor.

[0087] Optionally, the first positioning portion 540 may be a positioning protrusion, a positioning step, a positioning plate, a positioning rib, etc., which are arranged on the side wall of the installation cavity 510 and are not specifically limited here.

[0088] Further, referring to Figures 9 to 12, the first positioning portion 540 is in the shape of a rectangular parallelepiped, and a connecting through hole 541 is provided on one side of the rectangular parallelepiped first positioning portion 540 and is used to abut against a side of the circuit board 400 provided with the pin 410. The second positioning portion 550 includes at least two plate-like bodies arranged at intervals from each other, one side of the plate-like body is connected to the inner wall of the installation cavity 510, and the other side is arranged opposite to the first positioning portion 540 and is used to abut against a side of the circuit board 400 away from the pin 410.

[0089] In one embodiment, at least two pins 410 are provided, and at least two connecting through holes 541 are provided and are arranged in one-to-one correspondence with the pins 410 .

[0090] Please refer to FIG. 3 and FIG. 4 . In one embodiment, the circuit board 400 is provided with a first assembly groove 420 , and the magnetic field detector 300 is located in the first assembly groove 420 .

[0091] By opening the first assembly groove 420 on the circuit board 400 , a position for installing the magnetic field detector 300 is vacated, the internal space of the installation cavity 510 is saved, and the overall structure of the current sensor is more compact.

[0092] Further, referring to FIG. 3 and FIG. 4 , the first assembly slot 420 is opened at one side of the circuit board 400 , and the magnetic field detector 300 is electrically connected to the circuit board 400 through the side wall of the first assembly slot 420 .

[0093] Referring to FIG. 3 and FIG. 4 , in one embodiment, the circuit board 400 is provided with a second assembly groove 430 , and the shape of the second assembly groove 430 matches the shape of the mounting portion 260 .

[0094] By opening a second assembly groove 430 on the circuit board 400, space is freed up for accommodating the mounting portion 260. When the circuit board 400 is electrically connected to the mounting portion 260 through the grounding unit 250, the second assembly groove 430 on the circuit board 400 matches the mounting portion 260, saving the internal space of the mounting cavity 510, making the overall structure of the current sensor more compact.

[0095] Furthermore, the second assembly groove 430 is opened at one side of the circuit board 400 , and the depth of the second assembly groove 430 matches the thickness of the mounting portion 260 .

[0096] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A current sensor, characterized in that: include: A magnetic core, wherein the magnetic core is provided with an air gap; A mounting member, the mounting member comprising a first abutting portion, a second abutting portion and a mounting portion, the first abutting portion and the second abutting portion are both connected to the mounting portion, the first abutting portion and the second abutting portion are arranged at intervals along a first direction of the current sensor, the magnetic core has a first side surface and a second side surface arranged opposite to each other, the first abutting portion abuts against the first side surface, and the second abutting portion abuts against the second side surface; as well as A magnetic field detector is located in the air gap and connected to the mounting portion.

2. The current sensor according to claim 1, characterized in that: The first abutting portion and the second abutting portion are protrudingly arranged on the surface of the same side of the mounting portion, and the mounting portion extends along the second direction of the current sensor and crosses the air gap. At least two first abutting portions are provided and are spaced apart on the mounting portion along the second direction, wherein at least one of the first abutting portions abuts against the first side surface located on one side of the air gap along the second direction, and at least one of the first abutting portions abuts against the first side surface located on the other side of the air gap along the second direction; at least two second abutting portions are provided and are spaced apart on the mounting portion along the second direction, wherein at least one of the second abutting portions abuts against the second side surface located on one side of the air gap along the second direction, and at least one of the second abutting portions abuts against the second side surface located on the other side of the air gap along the second direction.

3. The current sensor according to claim 1, characterized in that: The current sensor further includes a circuit board, the magnetic field detector is electrically connected to the circuit board, and the mounting member further includes a grounding unit, the grounding unit is electrically connected to the mounting portion and to the circuit board.

4. The current sensor according to claim 3, characterized in that: The grounding unit includes a first grounding terminal and a second grounding terminal, the first grounding terminal and the second grounding terminal are both protruding from the surface of the same side of the mounting portion, the first grounding terminal and the second grounding terminal are spaced apart along the thickness direction of the circuit board, the first grounding terminal abuts against one side of the circuit board, and the second grounding terminal abuts against the other side of the circuit board.

5. The current sensor according to claim 4, characterized in that: One end of the first grounding terminal and one end of the second grounding terminal are both arranged on the surface of the same side of the mounting portion, the other end of the first grounding terminal is provided with a first abutment protrusion, and the other end of the second grounding terminal is provided with a second abutment protrusion, the first abutment protrusion and the second abutment protrusion are arranged opposite to each other, and the circuit board is clamped between the first abutment protrusion and the second abutment protrusion.

6. The current sensor according to claim 3, characterized in that: The current sensor further comprises a shell having a mounting cavity, wherein the magnetic core, the mounting member, the magnetic field detector and the circuit board are all located in the mounting cavity.

7. The current sensor according to claim 6, characterized in that: The shell is provided with a connecting channel, and the connecting channel is communicated with the installation cavity. One side of the circuit board is provided with a pin, and the pin is inserted into the connecting channel.

8. The current sensor according to claim 7, characterized in that: A first positioning portion and a second positioning portion are also provided in the installation cavity. The first positioning portion and the second positioning portion are arranged opposite to each other. The first positioning portion is provided with a connecting through hole, and the connecting through hole is communicated with the connecting channel. The first positioning portion abuts against a side of the circuit board where the pins are provided. The pins are sequentially inserted into the connecting through hole and the connecting channel. The second positioning portion abuts against a side of the circuit board away from the pins.

9. The current sensor according to claim 3, characterized in that: The circuit board is provided with a first assembly groove, and the magnetic field detector is located in the first assembly groove.

10. The current sensor according to claim 3, characterized in that: The circuit board is provided with a second assembly groove, and the shape of the second assembly groove matches the shape of the mounting portion.

11. The current sensor according to claim 1, characterized in that: The magnetic core is formed by winding a sheet material in a preset direction to form a detection channel inside the magnetic core.

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