A snap-on open-loop hall current sensor

Abstract

The utility model relates to current detection technical field provides a kind of buckle formula open loop hall current sensor, including upper shell, lower shell, hall piece and circuit board;One side of upper shell and lower shell is hinged by rotating shaft structure, and the other side is openable and closable connection by buckle structure;Upper shell inside is embedded with upper magnetic core, lower shell inside is embedded with lower magnetic core, and magnetic core air gap is formed when upper magnetic core and lower magnetic core close, and hall piece is arranged in magnetic core air gap;Circuit board is fixedly arranged in lower shell, and circuit board is electrically connected with hall piece, with the effect of improving installation efficiency, improving assembly accuracy.

Description

Technical Field

[0001] This utility model relates to the field of current detection technology, specifically to a snap-on open-loop Hall current sensor. Background Technology

[0002] Hall effect current sensors utilize the Hall effect principle to isolate and detect primary currents. In industrial applications, they often need to be installed without disassembling the busbar. To address this, existing open-loop Hall effect current sensors employ a closable structure: the housing is divided into upper and lower parts based on the center line of the perforation in the sensor housing, and copper inserts and screws are used on both sides of the housing for mechanical fixation. However, this structure has significant drawbacks: firstly, assembly using metal screws requires tools such as screwdrivers, making operation difficult in confined spaces and reducing installation efficiency; secondly, the machining tolerances of the metal screws make assembly accuracy difficult to control. For example, excessive clearance affects sensor measurement accuracy, while insufficient clearance makes it difficult for the screw to fit properly with the plastic hole, increasing production and material costs. Therefore, the problem persists: low installation efficiency and difficulty in controlling assembly accuracy. Utility Model Content

[0003] The purpose of this invention is to provide a snap-on open-loop Hall current sensor to solve the problems of low installation efficiency and difficulty in controlling assembly accuracy.

[0004] To achieve the above objectives, this utility model provides a snap-fit ​​open-loop Hall current sensor, which adopts the following technical solution: A snap-fit ​​open-loop Hall current sensor includes an upper housing, a lower housing, a Hall element, and a circuit board. The upper housing and the lower housing are hinged on one side via a rotating shaft structure, and the other side is openable and closable via a snap-fit ​​structure. An upper magnetic core is embedded inside the upper housing, and a lower magnetic core is embedded inside the lower housing. When the upper and lower magnetic cores are closed, a magnetic core air gap is formed, and the Hall element is disposed within this air gap. The circuit board is fixedly disposed within the lower housing and is electrically connected to the Hall element.

[0005] As an optimization of a snap-fit ​​open-loop Hall current sensor, the rotating shaft structure includes a central shaft and a shaft hole that cooperate with each other. The central shaft is disposed on the side wall of the upper housing or the lower housing, and the shaft hole is disposed on the side wall of the other housing. The central shaft is rotatably inserted through the shaft hole.

[0006] As an optimization of the snap-on open-loop Hall current sensor, the snap-on structure includes a mutually cooperating elastic hook and a locking part. The elastic hook is disposed on the side wall of the upper housing or the lower housing, and the locking part is correspondingly disposed on the side wall of the other housing. The elastic hook is provided with a slot, and when snapped on, the locking part is embedded in the slot to achieve self-locking.

[0007] As an optimization of the snap-on open-loop Hall current sensor, the locking part is provided with a guide slope, and the elastic hook slides along the guide slope to the locking position when it is engaged.

[0008] As an optimization of the snap-on open-loop Hall current sensor, both the upper housing and the lower housing are provided with reinforced connection holes on their side walls. In the closed state, the central axes of the reinforced connection holes of the upper housing and the lower housing coincide, forming a through channel through which cable ties or screws can pass.

[0009] As an optimization of the snap-on open-loop Hall current sensor, a lead post is fixedly connected to the circuit board, and an external wire is passed through the lead post to make an electrical connection with the circuit board. A limit groove is provided on the inner wall of the lower housing, and a positioning block is fixedly connected to the side wall of the lead post. The positioning block is inserted into the limit groove.

[0010] As an optimization of the snap-on open-loop Hall current sensor, the internal cavity of the lower housing is filled with potting compound, which covers the circuit board and the Hall element.

[0011] As an optimization of a snap-fit ​​open-loop Hall current sensor, the potting compound is a high-temperature flame-retardant insulating material, which includes epoxy resin or silicone gel.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) Significantly improves installation efficiency: Through the hinge of the rotating shaft structure and the cooperation of the snap-fit ​​structure, one-handed opening and closing operation can be achieved, and sensors can be quickly installed or removed without tools. It is especially suitable for narrow space scenarios such as automotive battery packs, solving the problems of cumbersome and space-limited traditional screw assembly operations.

[0013] (2) Precise control of assembly accuracy: The snap-fit ​​structure adopts the self-locking cooperation of the elastic hook and the locking part with the guide slope. When closed, it self-locks and avoids the assembly gap problem caused by the machining tolerance of metal screws, ensuring the stability of the air gap size of the magnetic core and improving the consistency of current detection.

[0014] (3) Enhanced structural reliability: The side wall of the housing is provided with coaxially aligned reinforcing connection holes, which can be fastened again by cable ties or screws to adapt to high vibration environments such as vehicle-mounted; the lower housing is filled with high temperature flame retardant potting compound to cover the circuit board and Hall plate, achieving waterproof, dustproof, corrosion resistant and flame retardant properties, ensuring long-term stability under harsh working conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a snap-fit ​​open-loop Hall current sensor according to an embodiment of this application; Figure 2 This is an exploded view of a snap-fit ​​open-loop Hall current sensor according to an embodiment of this application.

[0017] In the diagram: 1. Upper housing; 11. Upper magnetic core; 2. Lower housing; 21. Lower magnetic core; 22. Limiting groove; 3. Hall plate; 4. Circuit board; 5. Rotating shaft structure; 51. Central shaft; 52. Shaft hole; 6. Snap-fit ​​structure; 61. Elastic hook; 611. Slot; 62. Locking part; 621. Guide slope; 7. Reinforcing connection hole; 8. Wire post; 81. Positioning block. Detailed Implementation

[0018] To make the technical solution and advantages of this utility model clearer, the present utility model and its beneficial effects will be described in further detail below with reference to specific embodiments and accompanying drawings. However, the embodiments of this utility model are not limited thereto.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0021] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail below.

[0022] This application provides a snap-fit ​​open-loop Hall current sensor, which adopts the following technical solution: Reference Figure 1 and Figure 2 The snap-fit ​​open-loop Hall current sensor includes an upper housing 1, a lower housing 2, a Hall element 3, and a circuit board 4. The upper housing 1 and lower housing 2 are complementary semi-circular annular plastic parts, each with an independent internal cavity. One side of the upper housing 1 and lower housing 2 is hinged via a rotating shaft structure 5, while the other side is openable and closable via a snap-fit ​​structure 6. An upper magnetic core 11 is embedded inside the upper housing 1, and a lower magnetic core 21 is installed inside the lower housing 2. Both the upper magnetic core 11 and the lower magnetic core 21 are semi-circular solid soft magnetic materials, such as ferrite or silicon steel. When the upper magnetic core 11 and the lower magnetic core 21 are closed, their end faces form a magnetic core air gap, within which the Hall element 3 is installed. Specifically, in this embodiment, the lower magnetic core 21 is installed inside the lower housing 2. The arc length of the lower magnetic core 21 is slightly shorter than the semi-circular length of the inner cavity of the lower housing 2 by 1-2 mm. The Hall plate 3 is installed on the end faces of both ends of the lower magnetic core 21, and is completely embedded in the lower housing 2 along with the lower magnetic core 21. This ensures that the Hall plate 3 is located within the air gap of the magnetic core, while also preventing the Hall plate 3 from being damaged by external physical forces. The circuit board 4 is fixedly installed inside the lower housing 2 with screws, and the pins of the circuit board 4 and the Hall plate 3 are fixedly connected by soldering.

[0023] With the above structure, the housing can be rotated open by gently pushing the buckle, and the housing can be automatically locked and closed by snapping the buckle, realizing the detachable connection between the upper housing 1 and the lower housing 2. While ensuring product performance, the traditional copper inserts and screws are eliminated, solving the precision problem caused by assembly gaps, improving the installation efficiency in narrow spaces, making it easy to operate and highly stable, occupying little space, and facilitating installation in limited spaces.

[0024] In a preferred embodiment of this application, reference is made to Figure 1 and Figure 2 The rotating shaft structure 5 includes a central shaft 51 and a shaft hole 52 that cooperate with each other. The central shaft 51 is integrally formed on the side wall of the upper housing 1 or the lower housing 2, and the shaft hole 52 is correspondingly opened on the side wall of the other housing. The central shaft 51 is rotatably inserted through the shaft hole 52. The cooperation between the central shaft 51 and the shaft hole 52 is fixed by a mold to ensure the accuracy of the sensor, thereby realizing the rotational connection function of the upper housing 1 and the lower housing 2 on one side. Specifically, in this embodiment, the central shaft 51 is located on the side wall of the upper housing 1, and the shaft hole 52 is located on the side wall of the lower housing 2. In other embodiments, the positions of the central shaft 51 and the shaft hole 52 can be interchanged, which can also realize the mutual cooperation hinge function.

[0025] In a preferred embodiment of this application, reference is made to Figure 1 and Figure 2The snap-fit ​​structure 6 includes a mutually cooperating elastic hook 61 and a locking part 62. The elastic hook 61 is fixedly connected to the side wall of the upper housing 1 or the lower housing 2, and the locking part 62 is correspondingly fixedly connected to the side wall of the other housing. The elastic hook 61 is provided with a slot 611. When snapped together, the locking part 62 is embedded in the slot 611 to achieve self-locking, thereby realizing the detachable connection between the upper housing 1 and the other side of the lower housing 2. Specifically, in this embodiment, the elastic hook 61 is an elastic plastic sheet, the slot 611 is a square groove, and the locking part 62 is a square protrusion. The elastic hook 61 is located on the side wall of the upper housing 1, and the locking part 62 is located on the side wall of the lower housing 2. In other embodiments, the positions of the elastic hook 61 and the locking part 62 can be interchanged, and the shapes of the slot 611 and the locking part 62 can be any mutually cooperating shapes, which can also realize the mutually cooperating detachable function.

[0026] Furthermore, referring to Figure 1 and Figure 2 The side of the locking part 62 away from the housing is a guide slope 621. The guide slope 621 is inclined according to the direction of engagement, guiding the elastic hook 61 to open. When the elastic hook 61 is engaged, it slides along the guide slope 621 to the locking position, and the locking part 62 enters the slot 611 to achieve a locking and fixing. When closed, the elastic hook 61 slides smoothly along the guide slope 621 to the locking position, providing a firm closing force; to unlock, the elastic hook 61 needs to be pried outward to disengage the locking part 62 from the slot 611, preventing accidental opening and having a self-locking function.

[0027] In a preferred embodiment of this application, reference is made to Figure 1 Both the upper housing 1 and the lower housing 2 have reinforcing connection holes 7 on their side walls. Specifically, in this embodiment, both the upper housing 1 and the lower housing 2 have outwardly extending connection platforms on their side walls, and the connection platforms have reinforcing connection holes 7. In the closed state, the connection platforms of the upper housing 1 and the lower housing 2 are aligned, and the central axis 51 of the reinforcing connection holes 7 of the upper housing 1 and the lower housing 2 coincides, forming a through channel through which cable ties or screws can pass, providing a secondary reinforcement interface, enhancing the overall reliability of the sensor, and facilitating its adaptation to high-vibration environments such as vehicle-mounted applications.

[0028] In a preferred embodiment of this application, reference is made to Figure 2A conductor post 8, a hollow circular tube, is welded and fixed onto the circuit board 4. External conductors pass through the conductor post 8 and connect electrically to the circuit board 4. A limiting groove 22 is formed on the inner wall of the bottom of the lower housing 2. In this embodiment, the limiting groove 22 is formed by two cuboid limiting blocks. In other embodiments, the limiting groove 22 can also be formed by recessing the inner wall of the bottom of the lower housing 2. The construction method of the limiting groove 22 is not limited here. A positioning block 81 is fixedly connected to the side wall of the conductor post 8. The positioning block 81 is cuboid and is inserted into the limiting groove 22. The cooperation between the positioning block 81 and the limiting groove 22 enables the circuit board 4 to be quickly pre-positioned, placing the circuit board 4 in the central area of ​​the lower housing 2 and ensuring that the Hall plate 3 is always in the detection area of ​​the center of the magnetic core air gap, reducing the offset of the Hall plate 3 and improving the consistency of current measurement.

[0029] In a preferred embodiment of this application, after installation, the internal cavity of the lower housing 2 is filled with potting compound. The potting compound of the lower housing 2 covers the circuit board 4 and the Hall effect sensor 3, forming a protective layer for the electronic components and encapsulating and protecting them. In practical applications, the internal cavity of the upper housing 1 is also filled with potting compound to provide equal protection for the internal components of the upper housing 1.

[0030] Furthermore, the potting compound is a high-temperature flame-retardant insulating material, including epoxy resin or silicone gel. It has a high insulation level and a flame retardant rating of UL94V-0 (referring to the requirements of GB / T 16935.1). It can effectively provide high-temperature flame retardancy, waterproofing, dustproofing, moisture-proofing, acid and alkali resistance, and corrosion resistance, ensuring the long-term stability of the sensor under harsh working conditions.

[0031] The application process and implementation principle of this application embodiment are as follows: When a sensor needs to be installed, the upper housing 1 and the lower housing 2 are opened and placed around the busbar to be measured. The upper housing 1 and the lower housing 2 are then closed, allowing the elastic hook 61 to slide along the guide slope 621 of the locking part 62 to the self-locking position. No tools are required throughout the process, enabling one-handed opening and closing operations. This significantly improves the installation efficiency in narrow spaces such as automotive battery packs. Compared to the traditional mechanical fixing with copper inserts and screws, the self-adaptive locking of the elastic hook 61 and the locking part 62 avoids the installation of metal screws, avoiding random errors in traditional screw assembly and significantly improving assembly accuracy. After the sensor is installed, an air gap is formed between the end faces of the upper magnetic core 11 and the lower magnetic core 21, and the Hall plate 3 is fixed at the center of the air gap. The busbar current generates a ring magnetic field, which is converged by the magnetic core into a concentrated magnetic field that passes vertically through the Hall plate 3. The Hall plate 3 outputs a Hall voltage signal, which is processed by the circuit board 4 and converted into a standard electrical signal output, achieving high-precision current detection without disassembling the busbar. The circuit board 4 and Hall plate 3 are encapsulated with potting compound to form an insulating protective layer. Combined with the secondary reinforcement of the cable ties in the reinforced connection hole 7, the long-term stability of the sensor is ensured under harsh conditions such as vehicle vibration and humidity.

[0032] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A snap-fit ​​open-loop Hall current sensor, characterized in that, It includes an upper housing (1), a lower housing (2), a Hall plate (3), and a circuit board (4); the upper housing (1) and the lower housing (2) are hinged on one side by a rotating shaft structure (5), and the other side can be opened and closed by a snap-fit ​​structure (6); an upper magnetic core (11) is embedded inside the upper housing (1), and a lower magnetic core (21) is embedded inside the lower housing (2). When the upper magnetic core (11) and the lower magnetic core (21) are closed, a magnetic core air gap is formed, and the Hall plate (3) is disposed in the magnetic core air gap; the circuit board (4) is fixedly disposed in the lower housing (2), and the circuit board (4) is electrically connected to the Hall plate (3).

2. The snap-fit ​​open-loop Hall current sensor according to claim 1, characterized in that, The rotating shaft structure (5) includes a central shaft (51) and a shaft hole (52) that cooperate with each other. The central shaft (51) is disposed on the side wall of the upper housing (1) or the lower housing (2), and the shaft hole (52) is disposed on the side wall of the other housing. The central shaft (51) is rotatably inserted through the shaft hole (52).

3. A snap-fit ​​open-loop Hall current sensor according to claim 1, characterized in that, The buckle structure (6) includes a mutually cooperating elastic hook (61) and a locking part (62). The elastic hook (61) is disposed on the side wall of the upper housing (1) or the lower housing (2), and the locking part (62) is disposed on the side wall of the other housing. The elastic hook (61) is provided with a slot (611). When fastened, the locking part (62) is embedded in the slot (611) to achieve self-locking.

4. A snap-fit ​​open-loop Hall current sensor according to claim 3, characterized in that, The locking part (62) is provided with a guide slope (621), and the elastic hook (61) slides along the guide slope (621) to the locking position when it is engaged.

5. A snap-fit ​​open-loop Hall current sensor according to claim 1, characterized in that, Both the upper housing (1) and the lower housing (2) are provided with reinforcing connection holes (7) on their side walls. In the closed state, the central axis (51) of the reinforcing connection holes (7) of the upper housing (1) and the lower housing (2) coincides, forming a through channel through which cable ties or screws can pass.

6. A snap-fit ​​open-loop Hall current sensor according to claim 1, characterized in that, A conductor post (8) is fixedly connected to the circuit board (4). The conductor post (8) allows external conductors to pass through and connect to the circuit board (4) electrically. A limiting groove (22) is provided on the inner wall of the lower housing (2). A positioning block (81) is fixedly connected to the side wall of the conductor post (8). The positioning block (81) is inserted into the limiting groove (22).

7. A snap-fit ​​open-loop Hall current sensor according to claim 1, characterized in that, The internal cavity of the lower housing (2) is filled with potting compound, which covers the circuit board (4) and the Hall plate (3).

8. A snap-fit ​​open-loop Hall current sensor according to claim 7, characterized in that, The potting compound is a high-temperature flame-retardant insulating material, which includes epoxy resin or silicone gel.

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