Current sensor

Abstract

The utility model 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

[0002] The current sensor is a device for detecting the current size and other information in the conductor to be measured. When the current sensor is used, the conductor to be measured needs to be placed in the detection area of the current sensor. When the conductor to be measured is connected with current, 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. According to the size of the magnetic induction intensity, the current size connected by the conductor to be measured is inversely deduced, so as to realize 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 extending parts, the magnetic core is provided with at least two openings corresponding to the extending parts one by one, and the extending parts penetrate through the openings corresponding thereto, so as to realize the assembly between the magnetic field detection mechanism and the magnetic core. However, this connection mode usually needs higher machining precision. When the position or shape of the extending part does not match the position or shape of the opening, the extending part is difficult to penetrate through the opening, which leads to low production yield of the current sensor and increases the production cost. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a current sensor aiming at the problem of low production yield of the current sensor in the conventional technology, which leads to the increase of production cost.

[0005] The technical scheme is as follows:

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

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

[0008] a mounting piece, 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 connected with the mounting part, the first abutting part and the second abutting part 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 oppositely, the first abutting part abuts on the first side surface, and the second abutting part abuts on the second side surface; and

[0009] a magnetic field detector, the magnetic field detector is located in the air gap and connected with the mounting part.

[0010] The first abutting part and the second abutting part arranged on the mounting part are used for abutting the first side surface and the second side surface of the magnetic core respectively, so that when the current sensor is assembled, the magnetic core is clamped between the first abutting part and the second abutting part of the mounting part, and the magnetic field sensor on the mounting part is arranged in the air gap of the magnetic core to complete the assembly. Compared with the prior art, the current sensor clamps the magnetic core through the first abutting part and the second abutting part arranged on the mounting part, and the magnetic field sensor on the mounting part is arranged in the air gap of the magnetic core to realize the assembly of the current sensor, without high machining precision, thereby reducing the production cost.

[0011] In one embodiment, the first abutting part and the second abutting part are arranged on the same side surface of the mounting part, the mounting part extends along the second direction of the current sensor and across the air gap, the first abutting part is provided with at least two and arranged on the mounting part in the second direction, at least one of the first abutting parts abuts the first side surface on one side of the air gap along the second direction, and at least one of the first abutting parts abuts the first side surface on the other side of the air gap along the second direction; the second abutting part is provided with at least two and arranged on the mounting part in the second direction, at least one of the second abutting parts abuts the second side surface on one side of the air gap along the second direction, and at least one of the second abutting parts abuts the second side surface on the other side of the air gap along the second direction.

[0012] The at least one first abutting part and the at least one second abutting part can clamp the magnetic core on one side of the air gap along the second direction, and at the same time, the at least one first abutting part and the at least one second abutting part can clamp the magnetic core on the other side of the air gap along the second direction, thereby improving the assembly stability and reliability between the mounting part and the magnetic core.

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

[0014] The magnetic core passes through the first abutting part, the second abutting part, the mounting part, the grounding unit and the circuit board in sequence, the circuit board can be connected to an external wiring terminal, thereby realizing the grounding of the magnetic core. The grounding of the magnetic core can not only ensure the operation 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 of the embodiments, the grounding unit comprises a first grounding terminal and a second grounding terminal, both of which are protrudingly arranged on the surface of the same side of the mounting portion, and are spaced apart along the thickness direction of the circuit board, the first grounding terminal abuts against one surface of the circuit board, and the second grounding terminal abuts against the other surface of the circuit board.

[0016] The first grounding terminal and the second grounding terminal respectively abut against the opposite surfaces of the circuit board, which not only realizes the electrical connection with the circuit board and the grounding of the magnetic core, but also plays a certain positioning role on the circuit board, preventing the displacement of the circuit board and the movement of the magnetic field detector in the air gap, thereby affecting the detection accuracy of the current sensor.

[0017] In one of the embodiments, one end of the first grounding terminal and one end of the second grounding terminal are 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 abutting protrusion, the other end of the second grounding terminal is provided with a second abutting protrusion, the first abutting protrusion and the second abutting protrusion are oppositely arranged, and the circuit board is clamped between the first abutting protrusion and the second abutting protrusion.

[0018] The first abutting protrusion and the second abutting protrusion 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 on the circuit board.

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

[0020] The housing can protect the mounting member, the magnetic field detector, and the circuit board in the mounting cavity from being damaged by external devices.

[0021] In one of the embodiments, the housing is provided with a connecting channel, the connecting channel is in communication with the mounting cavity, one surface of the circuit board is provided with a pin, and the pin is arranged in the connecting channel.

[0022] The pin of the circuit board passes through the connecting channel of the housing to realize the electrical connection between the pin and the external terminal, thereby realizing the information transmission, grounding, and power supply of the circuit board.

[0023] In one of the embodiments, the mounting cavity is further provided with a first positioning part and a second positioning part, the first positioning part and the second positioning part are oppositely arranged, the first positioning part is provided with a connecting through hole, the connecting through hole is communicated with the connecting channel, the first positioning part is abutted to one side of the circuit board where the pin is arranged, and the pin is sequentially arranged in the connecting through hole and the connecting channel, and the second positioning part is abutted to one side of the circuit board away from the pin.

[0024] The first positioning part and the second positioning part in the mounting cavity are oppositely arranged to clamp the circuit board therebetween, meanwhile, the connecting through hole on the first positioning part is communicated with the connecting channel of the shell, and the pin can be sequentially arranged in the connecting through hole on the first positioning part and the connecting channel, so as to realize the electrical connection between the pin and the external terminal; in this way, the circuit board can be positioned while realizing the functions of information transmission, grounding and power supply of the circuit board, and the movement of the circuit board in the mounting cavity is prevented to affect the detection accuracy of the current sensor.

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

[0026] The first assembly groove is arranged on the circuit board to leave a position for mounting the magnetic field detector, thereby saving the internal space of the mounting cavity and making the overall structure of the current sensor more compact.

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

[0028] The second assembly groove is arranged on the circuit board to leave a space for accommodating the mounting part, when the circuit board is electrically connected with the mounting part through the grounding unit, the second assembly groove on the circuit board matches the mounting part, thereby 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 in a preset direction to form a detection channel in the interior of the magnetic core.

[0030] The sheet material is wound in a preset direction to form the magnetic core, and the interior of the magnetic core is formed with a detection channel for the to-be-detected wire to pass through, so that the magnetic core is composed of multiple layers of sheet materials in the radial direction of the detection channel, i.e., the first direction; in this way, the first abutment part and the second abutment part can clamp the magnetic core in the radial direction of the detection channel, so that the sheet materials are more tightly attached to each other, the noise of the magnetic core is lower, the magnetic flux distribution is more uniform, and the detection accuracy of the current sensor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the magnetic core, the mounting member, the magnetic field detector and the circuit board assembled in an embodiment of the present application.

[0033] Figure 2 A top view of the magnetic core, the mounting member, the magnetic field detector and the circuit board assembled in an embodiment of the present application.

[0034] Figure 3 A schematic diagram of the magnetic field detector, the circuit board and the mounting member assembled in an embodiment of the present application.

[0035] Figure 4 A schematic diagram of the magnetic field detector and the circuit board assembled in an embodiment of the present application.

[0036] Figure 5 A structural schematic diagram of the mounting member in an embodiment of the present application.

[0037] Figure 6 A winding schematic diagram of the magnetic core in an embodiment of the present application.

[0038] Figure 7 An exploded view of the current sensor in an embodiment of the present application.

[0039] Figure 8 A schematic diagram of the external structure of the current sensor in an embodiment of the present application.

[0040] Figure 9 A schematic diagram of the magnetic core, the mounting member, the magnetic field detector and the circuit board mounted in the shell in an embodiment of the present application.

[0041] Figure 10 A Figure 9 A partial enlarged view of A in FIG. 9.

[0042] Figure 11 A structural schematic diagram of the mounting cavity in an embodiment of the present application

[0043] Figure 12 A Figure 10 A partial enlarged view of B in FIG. 10.

[0044] BRIEF DESCRIPTION OF DRAWINGS

[0045] 100, magnetic core; 110, air gap; 120, detection channel; 130, sheet; 141, first side; 142, second side; 200, mounting piece; 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, housing; 510, mounting cavity; 520, detection through hole; 530, connection channel; 540, first positioning portion; 541, connection through hole; 550, second positioning portion. DETAILED DESCRIPTION

[0046] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and it is intended that the present application cover all modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0047] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0049] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "installation", "connection", "connection", "fixation" and the like, these terms should be broadly interpreted. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless specifically defined otherwise, if there is a similar description of the first feature "on" or "under" the second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or simply indicate that the first feature is lower than the second feature in horizontal height.

[0051] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0052] Please refer to Figures 1 to 5 One embodiment of the present application provides a current sensor, comprising 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 comprises 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 connected with the mounting portion 260, the first abutting portion 210 and the second abutting portion 220 are arranged in a first direction of the current sensor (i.e. A direction in Figure 2 、 Figure 3 and Figure 5 A direction), the magnetic core 100 has a first side surface 141 and a second side surface 142 arranged oppositely, the first abutting portion 210 abuts the first side surface 141, and the second abutting portion 220 abuts the second side surface 142; the magnetic field detector 300 is located in the air gap 110 and connected with the mounting portion 260.

[0053] The first abutting portion 210 and the second abutting portion 220 are respectively arranged to abut against the first side surface 141 and the second side surface 142 of the magnetic core 100, so that 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 arranged in the air gap 110 of the magnetic core 100, so as to complete the assembly. Compared with the prior art, the current sensor is clamped by the first abutting portion 210 and the second abutting portion 220 arranged on the mounting portion 260, and the magnetic field detector 300 on the mounting portion 260 is arranged in the air gap 110 of the magnetic core 100, so as 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 interval between the first abutting portion 210 and the second abutting portion 220 is smaller than the thickness between the first side surface 141 and the second side surface 142. Even if there is a manufacturing error that causes the thickness between the first side surface 141 and the second side surface 142 of each magnetic core 100 to be different, or the interval between the first abutting portion 210 and the second abutting portion 220 of each mounting member 200 to be different, the assembly is only affected by the different clamping forces of the first abutting portion 210 and the second abutting portion 220 on the magnetic core 100 after assembly, but the assembly can still be successfully performed, so that high processing precision is not required, which is beneficial to reducing production cost.

[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 (which can also be understood as the radial direction of the magnetic core 100, that is, the A direction in Figure 2 , Figure 3 and Figure 5 ), and the first abutting portion 210 and the second abutting portion 220 are arranged at intervals along the first direction of the magnetic core 100. In this way, the first abutting 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 abutting 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 abutting portion 210 and the second abutting portion 220 on the mounting portion 260, and the assembly between the magnetic core 100 and the magnetic field detector 300 on the mounting portion 260 is realized.

[0056] Further, referring to Figure 2 and Figure 6 , the air gap 110 is opened along the radial direction of the magnetic core 100 and communicates with the detection channel 120, and the detection channel 120 penetrates the inner annular surface and the outer annular surface of the magnetic core 100, so as to accommodate the magnetic field detector 300.

[0057] Referring to Figures 1 to 3 and Figure 5 In one embodiment, the mounting portion 260 is plate-shaped, the first abutting portion 210 and the second abutting portion 220 are arranged on the same side of the plate-shaped mounting portion 260, and the magnetic field detector 300 is 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 detection of the current of the conductor to be detected.

[0058] Further, when the conductor to be detected (such as a wire) with current passes through the detection channel 120 of the magnetic core 100, a magnetic field is generated around the conductor to be detected. The magnetic core 100 concentrates 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 inversely deduce the current passing through the conductor to be detected according to the size of the magnetic induction intensity, thereby realizing detection of the current of the conductor to be detected.

[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 magnetoresistance sensor, etc.

[0060] Referring to Figure 6 In one embodiment, the magnetic core 100 is formed by winding the sheet 130 in a predetermined direction to form the detection channel 120 in the interior of the magnetic core 100.

[0061] The sheet 130 is wound in a predetermined direction to form the magnetic core 100, and the detection channel 120 is formed in the interior of the magnetic core 100 for the conductor to be detected to pass through, so that the magnetic core 100 is composed of multiple layers of the sheet 130 along the radial direction of the detection channel 120, i.e., the first direction. In this way, the first abutting portion 210 and the second abutting portion 220 can clamp the magnetic core 100 along the first direction, so that the sheets 130 are more tightly attached to each other, 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] Further, compared with the laminated magnetic core 100, the sheets 130 located at different layers in the magnetic core 100 formed by winding the sheet 130 can be more tightly attached to each other, and the first abutting portion 210 and the second abutting portion 220 can clamp the magnetic core 100 in the thickness direction, thereby further improving the tightness between the sheets 130 located at 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] As an explanation, the predetermined direction in the above embodiment can be a clockwise direction or a counterclockwise direction, which is not specifically limited here.

[0064] In one embodiment, the sheet material 130 used to wind the magnetic core 100 is a silicon steel sheet, and after the silicon steel sheet is wound along a predetermined direction to form the magnetic core 100, the air gap 110 is formed by cutting the silicon steel sheet using a grinding wheel. Figure 6 In the illustrated embodiment, the portion of the magnetic core 100 that is cut using the grinding wheel is located exactly at the start and end of the winding of the silicon steel sheet, and thus Figure 6 The start and end of the winding of the silicon steel sheet are not shown.

[0065] Referring to Figures 2 to 3 In one embodiment, the first abutting portion 210 and the second abutting portion 220 are protrudingly arranged on the same side surface of the mounting portion 260, the mounting portion 260 extends along a second direction of the current sensor (i.e., the B direction in Figure 2 , Figure 3 and Figure 5 , the first abutting portion 210 is provided with at least two first abutting portions 210 arranged at intervals along the second direction of the mounting portion 260, at least one of the first abutting portions 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 of the first abutting portions 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 second abutting portions 220 arranged at intervals along the second direction of the mounting portion 260, at least one of the second abutting portions 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 of the second abutting portions 220 abuts against the second side surface 142 located on the other side of the air gap 110 along the second direction.

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

[0067] As an explanation, in the above-mentioned embodiment, the second direction of the current sensor refers to the width direction of the air gap 110 (i.e., the B direction in Figure 2 , Figure 3 and Figure 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] Referring to Figure 2 and Figure 5In one embodiment, the first abutting portion 210 and the second abutting portion 220 are each provided with two, one of the first abutting portions 210 and one of the second abutting portions 220 forming a first clamping unit 230, and the other of the first abutting portions 210 and the other of the second abutting portions 220 forming a second clamping unit 240, the first clamping unit 230 and the second clamping unit 240 being respectively arranged at opposite ends of the mounting portion 260 along the second direction, so that the first clamping unit 230 clamps the side of the magnetic core 100 located along the second direction on one side of the air gap 110, and the second clamping unit 240 clamps the side of the magnetic core 100 located along the second direction on the other side of the air gap 110, thereby achieving low cost and reliable assembly process.

[0069] Referring to Figure 5 In one embodiment, the first abutting portion 210 and the second abutting portion 220 are each provided with two, one of the first abutting portions 210 and one of the second abutting portions 220 forming a first clamping unit 230, and the other of the first abutting portions 210 and the other of the second abutting portions 220 forming a second clamping unit 240, the first clamping unit 230 and the second clamping unit 240 being respectively arranged at opposite ends of the mounting portion 260 along the second direction, so that the first clamping unit 230 clamps the side of the magnetic core 100 located along the second direction on one side of the air gap 110, and the second clamping unit 240 clamps the side of the magnetic core 100 located along the second direction on the other side of the air gap 110, thereby achieving low cost and reliable assembly process.

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

[0071] The magnetic core 100 sequentially passes through the first abutting portion 210 and the second abutting portion 220, the mounting portion 260, the grounding unit 250, and the circuit board 400, and the circuit board 400 can be connected to an external terminal, thereby achieving grounding of the magnetic core 100. The grounding of the magnetic core 100 not only ensures the operation safety of the current sensor, but also prevents electromagnetic interference to some extent, thereby improving the detection accuracy of the current sensor.

[0072] Further, the mounting member 200 is made of an electrically conductive material as a whole, thereby achieving electrical connection between the magnetic core 100 and the circuit board 400, the circuit board 400 can be connected to an external terminal, and finally the grounding of the magnetic core 100 is achieved.

[0073] Referring to Figure 3 and Figure 5 In one embodiment, the grounding unit 250 comprises a first grounding terminal 251 and a second grounding terminal 252, the first grounding terminal 251 and the second grounding terminal 252 are protrudingly arranged on 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 abut against opposite two surfaces of the circuit board 400, not only can realize the electrical connection with the circuit board 400 and realize the grounding of the magnetic core 100, but also can play a certain positioning role for the circuit board 400, prevent the circuit board 400 from being displaced and drive the magnetic field detector 300 to move in the air gap 110, and then affect 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 arranged on the same surface 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 not only can improve the stability of the electrical connection between the grounding unit 250 and the circuit board 400, but also can improve the positioning stability of the first grounding terminal 251 and the second grounding terminal 252 for the circuit board 400.

[0077] Further, 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, so that when the first grounding terminal 251 and the second grounding terminal 252 are electrically connected with the circuit board 400, the circuit board 400 is just located at the air gap 110 of the magnetic core 100, so that the magnetic field detection piece is located in the air gap 110.

[0078] Please refer to Figures 7 to 8 In one embodiment, the current sensor further comprises a housing 500 with a mounting cavity 510, the magnetic core 100, the mounting piece 200, the magnetic field detector 300 and the circuit board 400 are located in the mounting cavity 510.

[0079] The housing 500 can play a certain protection role for the mounting piece 200, the magnetic field detector 300 and the circuit board 400 arranged in the mounting cavity 510, prevent external devices from damaging the components in the mounting cavity 510 by knocking.

[0080] Further, 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 mounting cavity 510, the conductor to be detected can realize current detection through the detection through hole 520.

[0081] Please refer to Figures 7 to 8In one embodiment, the housing 500 is provided with a connection channel 530, which communicates with the mounting cavity 510. One side of the circuit board 400 is provided with pins 410, which pass through the connection channel 530.

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

[0083] In addition, after the mounting component 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 terminals to the pins 410 through the connection channel 530 on the housing 500. The side wall of the connection channel 530 can also limit and guide the external terminals, improving the user experience.

[0084] Furthermore, the circuit board 400 has multiple pins 410 for implementing different functions of the circuit board 400, for example, in Figure 3 In the illustrated embodiment, four pins 410 are provided: one pin 410 is used to connect to the positive terminal of the power supply, one pin 410 is used to connect to the negative terminal 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 see Figures 9 to 12 In one embodiment, the mounting cavity 510 is further provided with a first positioning part 540 and a second positioning part 550. The first positioning part 540 and the second positioning part 550 are arranged opposite to each other. The first positioning part 540 has a connecting through hole 541, which communicates with the connecting channel 530. The first positioning part 540 abuts against the side of the circuit board 400 where the pin 410 is provided. The pin 410 passes through the connecting through hole 541 and the connecting channel 530 in sequence. The second positioning part 550 abuts against the side of the circuit board 400 away from the pin 410.

[0086] The first positioning part 540 and the second positioning part 550 are arranged opposite to each other in the mounting cavity 510 to clamp the circuit board 400 between the first positioning part 540 and the second positioning part 550. At the same time, the connection through hole 541 on the first positioning part 540 is connected to the connection channel 530 of the housing 500. The pin 410 can pass through the connection through hole 541 and the connection channel 530 on the first positioning part 540 in sequence, thereby realizing the electrical connection between the pin 410 and the external terminal. With this arrangement, while realizing the functions of information transmission, grounding and power supply of the circuit board 400, the circuit board 400 can also be positioned to prevent the circuit board 400 from moving in the mounting cavity 510 and affecting the detection accuracy of the current sensor.

[0087] Optionally, the first positioning part 540 can be a positioning protrusion, a positioning step, a positioning plate, a positioning rib, etc. disposed on the side wall of the mounting cavity 510, which is not limited here.

[0088] Further, referring to Figures 9 to 12 , the first positioning part 540 is a cuboid, one side of the cuboid first positioning part 540 is provided with a connecting through hole 541 and is used for abutting against one side of the circuit board 400 provided with the pin 410, and the second positioning part 550 includes at least two plate-shaped bodies arranged at intervals, one side of the plate-shaped body is connected with the inner wall of the mounting cavity 510, and the other side is arranged opposite to the first positioning part 540 and is used for abutting against the side of the circuit board 400 away from the pin 410.

[0089] In one embodiment, the pin 410 is provided with at least two, and the connecting through hole 541 is provided with at least two and is arranged one-to-one corresponding to the pin 410.

[0090] Referring to Figure 3 and Figure 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 providing the first assembly groove 420 on the circuit board 400, a position for mounting the magnetic field detector 300 is released, the internal space of the mounting cavity 510 is saved, and the overall structure of the current sensor is more compact.

[0092] Further, referring to Figure 3 and Figure 4 , the first assembly groove 420 is provided on one side of the circuit board 400, and the magnetic field detector 300 is electrically connected with the circuit board 400 through the side wall of the first assembly groove 420.

[0093] Referring to Figure 3 and Figure 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 part 260.

[0094] By providing the second assembly groove 430 on the circuit board 400, a space for accommodating the mounting part 260 is released, when the circuit board 400 is electrically connected with the mounting part 260 through the grounding unit 250, the second assembly groove 430 on the circuit board 400 matches the mounting part 260, the internal space of the mounting cavity 510 is saved, and the overall structure of the current sensor is more compact.

[0095] Further, a second assembly groove 430 is formed in 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 can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it is to be understood that any combination of the technical features is within the scope of the present disclosure, as long as the combination does not result in contradictions.

[0097] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A current sensor, characterized by The current sensor comprises: a magnetic core, the magnetic core being 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 being connected with the mounting portion, the first abutting portion and the second abutting portion being spaced apart along a first direction of the current sensor, the magnetic core having a first side surface and a second side surface arranged oppositely, the first abutting portion abutting against the first side surface, and the second abutting portion abutting against the second side surface; and a magnetic field detector, the magnetic field detector being located in the air gap and connected with the mounting portion. The first abutting portion and the second abutting portion are protrudingly arranged on a same surface of the mounting portion, the mounting portion extending along a second direction of the current sensor and across the air gap, the first abutting portion being provided with at least two first abutting portions spaced apart along the second direction and arranged on the mounting portion, at least one of the first abutting portions abutting 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 abutting against the first side surface located on the other side of the air gap along the second direction, the second abutting portion being provided with at least two second abutting portions spaced apart along the second direction and arranged on the mounting portion, at least one of the second abutting portions abutting 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 abutting against the second side surface located on the other side of the air gap along the second direction.

2. The current sensor of claim 1, wherein, The current sensor further comprises a circuit board, the magnetic field detector being electrically connected with the circuit board, and the mounting member further comprises a grounding unit, the grounding unit being electrically connected with the mounting portion and electrically connected with the circuit board.

3. The current sensor of claim 1, wherein, The grounding unit comprises a first grounding terminal and a second grounding terminal, the first grounding terminal and the second grounding terminal being protrudingly arranged on a same surface of the mounting portion, the first grounding terminal and the second grounding terminal being spaced apart along a thickness direction of the circuit board, the first grounding terminal abutting against one surface of the circuit board, and the second grounding terminal abutting against the other surface of the circuit board.

4. The current sensor of claim 3, wherein, One end of the first grounding terminal and one end of the second grounding terminal are arranged on a same surface of the mounting portion, the other end of the first grounding terminal being provided with a first abutting protrusion, the other end of the second grounding terminal being provided with a second abutting protrusion, the first abutting protrusion and the second abutting protrusion being oppositely arranged, and the circuit board being clamped between the first abutting protrusion and the second abutting protrusion.

5. The current sensor of claim 4, wherein, The current sensor further comprises a housing provided with a mounting cavity, the magnetic core, the mounting member, the magnetic field detector and the circuit board being located in the mounting cavity.

6. The current sensor of claim 3, wherein, The housing is provided with a connecting channel, the connecting channel being in communication with the mounting cavity, one surface of the circuit board being provided with a pin, and the pin being arranged in the connecting channel.

7. The current sensor of claim 6, wherein, ​ 8. The current sensor of claim 7, wherein, The mounting cavity is further provided with a first positioning part and a second positioning part, the first positioning part and the second positioning part are oppositely arranged, the first positioning part is provided with a connecting through hole, the connecting through hole is communicated with the connecting channel, the first positioning part is abutted to one side of the circuit board provided with the pin, the pin is sequentially arranged in the connecting through hole and the connecting channel, and the second positioning part is abutted to one side of the circuit board away from the pin.

9. The current sensor of claim 3, wherein, 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 of claim 3, wherein, The circuit board is provided with a second assembly groove, and the shape of the second assembly groove is matched with the shape of the mounting part.

11. The current sensor of claim 1, wherein, The magnetic core is formed by winding a sheet material in a preset direction to form a detection channel in the interior of the magnetic core.

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