Closed-loop Hall current sensor

Abstract

The invention discloses a closed-loop Hall current sensor, and relates to the technical field of current sensors. The closed-loop Hall current sensor comprises a shell, a circuit board and a plurality of sensor modules, wherein the shell is provided with an accommodating cavity; the shell is provided with a plurality of first mounting holes; the circuit board is arranged in the containing cavity, and an avoiding opening is formed in the circuit board; the plurality of sensor modules are arranged on the circuit board at intervals; the sensor module comprises a shielding case, a sub-sensor assembly and a channel, the shielding case and the sub-sensor assembly are arranged on the circuit board, and the sub-sensor assembly is located in the shielding case; the channel penetrates through the circuit board and the shell in the thickness direction of the circuit board, and the end of the channel corresponds to the first mounting hole so that a cable to be detected can pass through the channel. The sub-sensor assembly is used for detecting the current of the cable to be detected in the channel. The closed-loop Hall current sensor achieves the purposes of high detection efficiency, high integration and high reliability.

Description

Technical Field

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

[0002] Closed-loop Hall current sensor, also known as zero-flux Hall current sensor, is a current detection device with high precision and fast response time. It can accurately measure DC, AC, pulse and various irregular waveform currents under electrical isolation conditions, and is irreplaceable in high current and high-frequency performance applications. Usually, closed-loop Hall current sensor can detect the current of the cable to be tested in real time and complete the electrical-magnetic-electrical insulation isolation conversion.

[0003] The closed-loop Hall current sensor in the related art adopts a single through-hole structure (one detection channel) and can only detect a single cable. For the detection of multi-branch cables, multiple closed-loop Hall current sensors are usually used to detect multiple branches separately. In this way, on the one hand, multiple closed-loop Hall current sensors occupy a large space, the wiring installation is complicated, and the detection efficiency is low; on the other hand, the detection of multi-branch cables will interfere with each other, and there may be magnetic interference, resulting in low detection accuracy. Summary of the invention

[0004] The embodiments of the present application provide a closed-loop Hall current sensor for solving the problem that the closed-loop Hall current sensor in the related art cannot achieve both high detection efficiency and detection accuracy when detecting multi-branch cables.

[0005] An embodiment of the present application provides a closed-loop Hall current sensor, comprising a shell, a circuit board and a plurality of sensor modules, the shell having a containing cavity; the shell being provided with a plurality of first mounting holes; the circuit board being arranged in the containing cavity, and a avoidance opening being provided on the circuit board; a plurality of the sensor modules being arranged at intervals on the circuit board; the sensor module comprising a shielding cover, a sub-sensor assembly and a channel, the shielding cover and the sub-sensor assembly being arranged on the circuit board, and the sub-sensor assembly being located inside the shielding cover; the channel penetrates the circuit board and the shell along the thickness direction of the circuit board, and the end of the channel corresponds to the first mounting hole for the cable to be tested to pass through; the sub-sensor assembly is used to detect the current of the cable to be tested located in the channel.

[0006] In some embodiments, the sub-sensor assembly includes: a magnetic focusing ring, a skeleton and a Hall element, the magnetic focusing ring is arranged on the circuit board, the magnetic focusing ring is located in the shielding cover, the channel is located in the magnetic focusing ring, and the magnetic focusing ring has a first opening; the skeleton is arranged on the circuit board and located at the first opening, and a secondary coil is provided on the skeleton; the Hall element is arranged on the circuit board and located at the first opening.

[0007] In some embodiments, in the thickness direction of the circuit board, the height of the shielding cover is greater than the height of the magnetic focusing ring.

[0008] In some embodiments, the shielding cover is ring-shaped.

[0009] In some embodiments, the thickness of the shielding cover is 0.1 mm to 0.4 mm.

[0010] In some embodiments, the magnetic focusing ring is electrically connected to the circuit board via a first conductive pin; and the frame is electrically connected to the circuit board via a second conductive pin.

[0011] In some embodiments, a second mounting hole is provided on the shell, an insulating member is provided at the second mounting hole, the insulating member has a central hole for a power line to pass through, and the power line is electrically connected to the circuit board.

[0012] In some embodiments, a plurality of hole groups are provided, the hole groups including a first mounting hole provided on the bottom wall of the shell and a first mounting hole provided on the top wall of the shell; in the hole groups, a first mounting hole provided on the bottom wall and a first mounting hole provided on the top wall are provided opposite to each other; the channel penetrates the shell along the height direction of the shell, and a plurality of the channels correspond one-to-one to a plurality of the hole groups.

[0013] In some embodiments, the shell includes a shell body and a cover body, the shell body has the accommodating cavity; one end of the channel is correspondingly connected to the first mounting hole located on the bottom wall of the shell body, so that the channel and the shell body are an integrated structure.

[0014] In some embodiments, a support column is provided on the bottom wall of the shell, the circuit board is screwed to the support column, the accommodating cavity is divided into a first accommodating space and a second accommodating space by the circuit board, the support column is located in the first accommodating space, and the sensor module is located in the second accommodating space.

[0015] The closed-loop Hall current sensor provided in the embodiment of the present application arranges multiple sensor modules at intervals on a circuit board, and at the same time, the sub-sensor assembly in each sensor module is located inside the shielding cover. This not only enables each sub-sensor assembly to independently perform current detection on the cables in the channel in the sensor module, thereby realizing simultaneous detection of multiple cables, thereby improving current detection efficiency and integration level, but also, when the sub-sensor assembly performs current detection on the cables in the channel in the sensor module, two adjacent sub-sensor assemblies are separated by the corresponding shielding cover arranged outside the sub-sensor, thereby reducing mutual interference between two or more adjacent sub-sensors when detecting cables in different channels, thereby improving the reliability of the closed-loop Hall current sensor, and thus enabling the closed-loop Hall current sensor to achieve the goals of high detection efficiency, high integration and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a partial structural schematic diagram of a closed-loop Hall current sensor in some embodiments of the present application;

[0018] Figure 2 for Figure 1 Exploded diagram of the closed-loop Hall current sensor in;

[0019] Figure 3 for Figure 1 The structure diagram of the closed-loop Hall current sensor in one perspective;

[0020] Figure 4 for Figure 1 Partial structural diagram of the closed-loop Hall current sensor from another perspective;

[0021] Figure 5 It is a schematic diagram of the structure of the shell body in the embodiment of the present application;

[0022] Figure 6 for Figure 4 AA cross section in;

[0023] Figure 7 A partial exploded view of the sensor module in this application;

[0024] Figure 8 for Figure 7Schematic diagram of the assembly of the sub-sensor assembly;

[0025] Fig. 9 This is the test wiring diagram for the closed-loop Hall current sensor.

[0026] Description of reference numerals:

[0027] 10. Shell; 101. Accommodation cavity; 102. First accommodation space; 103. Second accommodation space; 11. Shell body; 12. First mounting hole; 13. Second mounting hole; 14. Insulator; 15. Support column;

[0028] 20. Circuit board; 21. Avoidance; 22. Through hole; 23. Fastener;

[0029] 30. sensor module; 31. shielding cover; 32. channel; 33. sub-sensor assembly; 34. magnetic focusing ring; 340. first opening; 35. frame; 36. secondary coil;

[0030] 41. A first conductive needle; 42. A second conductive needle. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0033] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0035] like Figure 1 to Figure 5 As shown, an embodiment of the present application provides a closed-loop Hall current sensor. The closed-loop Hall current sensor comprises a housing 10, a circuit board 20 and a plurality of sensor modules 30, wherein the housing 10 has a receiving cavity 101; the housing 10 is provided with a plurality of first mounting holes 12; the circuit board 20 is arranged in the receiving cavity 101, and a avoidance opening 21 is provided on the circuit board 20; the plurality of sensor modules 30 are arranged on the circuit board 20 at intervals; the sensor module 30 comprises a shielding cover 31, a sub-sensor assembly 33 and a channel 32, the shielding cover 31 and the sub-sensor assembly 33 are arranged on the circuit board 20, and the sub-sensor assembly 33 is located inside the shielding cover 31; the channel 32 penetrates the circuit board 20 and the housing 10 along the thickness direction of the circuit board 20, and the end of the channel 32 corresponds to the first mounting hole 12 for the cable to be tested to pass through; the sub-sensor assembly 33 is used to detect the current of the cable to be tested located in the channel 32.

[0036] The shell 10 can be made of plastic or metal. The shell 10 in this embodiment is made of aviation aluminum, and the surface is anodized, so that the shell 10 has the characteristics of high hardness, good corrosion resistance, good insulation, etc. The thickness of the shell 10 can be determined according to the size and strength of the shell 10. For example, the thickness of the shell 10 is 1.5 mm.

[0037] The shielding cover 31 is used to block, absorb and disperse the magnetic field. The shielding cover 31 may be made of soft magnetic materials such as ferrite, iron-nickel alloy, and manganese oxide.

[0038] The first mounting holes 12 are mainly opposite to the plurality of channels 32, so that the cables to be detected pass through the channels 32 and penetrate the housing 10. Usually, the first mounting holes 12 appear in pairs, and each channel 32 has a first mounting hole 12 at each end.

[0039] By arranging multiple sensor modules 30 at intervals on the circuit board 20, and at the same time, the sub-sensor assembly 33 in each sensor module 30 is located inside the shielding cover 31, not only each sub-sensor assembly 33 can independently perform current detection on the cable in the channel 32 in the sensor module 30, thereby realizing simultaneous detection of multiple cables, thereby improving current detection efficiency and integration level, but also, when the sub-sensor assembly 33 performs current detection on the cable in the channel 32 in the sensor module 30, two adjacent sub-sensor assemblies 33 are separated by the corresponding shielding cover 31 arranged outside the sub-sensor, thereby reducing mutual interference between two or more adjacent sub-sensors when detecting cables in different channels 32, thereby improving the reliability of the closed-loop Hall current sensor, and thus enabling the closed-loop Hall current sensor to achieve the goals of high detection efficiency, high integration and high reliability.

[0040] Figure 1 and Figure 2 1 shows that the housing 10 is a rectangular parallelepiped structure, and the closed-loop Hall current sensor includes four sensor modules 30, and the four sensor modules 30 are arranged at intervals along a first direction, that is, the length direction of the housing 10. This structure is used as an example for description below.

[0041] In this embodiment, the channel 32 penetrates the shell 10 along the height direction of the shell 10, and the shell 10 is provided with 4 hole groups, each hole group includes a first mounting hole 12 arranged on the bottom wall of the shell 10 and a first mounting hole 12 arranged on the top wall of the shell 10; in the hole group, a first mounting hole 12 arranged on the bottom wall and a first mounting hole 12 arranged on the top wall are arranged opposite to each other; the 4 channels 32 correspond to the 4 hole groups one by one.

[0042] By arranging a one-to-one correspondence between the four hole groups and the four channels 32 , the distance between the channels 32 is reduced, which is beneficial to optimizing the closed-loop Hall current sensor structure.

[0043] The shell 10 includes a shell body 11 and a cover body (not shown in the figure), the shell body 11 has a receiving cavity 101; one end of the channel 32 is correspondingly connected to the first mounting hole 12 located on the bottom wall of the shell body 11, so that the channel 32 and the shell body 11 are an integrated structure.

[0044] The channel 32 is connected to the first mounting hole 12 on the bottom wall of the shell body 11 correspondingly, so that the channel 32 and the shell body 11 are integrated into one structure. In this way, not only the number of parts is reduced, but also the assembly process of the closed-loop Hall current sensor is simplified.

[0045] It should be noted that the housing 10 may be a cube structure in addition to a rectangular parallelepiped structure, or a rectangular parallelepiped structure in the longitudinal direction, in which case the plurality of sensor modules 30 are arranged at intervals along the longitudinal direction of the housing 10. In addition, the housing 10 may also be a prism or pyramid structure, in which the plurality of sensor modules 30 are arranged at intervals along the circumference of the housing 10.

[0046] like Figure 2 and Figure 5 As shown, in some embodiments, a second mounting hole 13 is provided on the shell 10. Specifically, a second mounting hole 13 is provided on the side wall of the shell body 11. An insulating member 14 is provided at the second mounting hole 13. The insulating member 14 has a central hole for a power cord to pass through. The power cord is electrically connected to the circuit board 20.

[0047] The second mounting hole 13 is mainly used for passing a power line through to be electrically connected to an external device.

[0048] The insulating member 14 is cylindrical, also called an insulator. The insulating member 14 is made of PBT material and is placed between the second mounting hole 13 and the power line to play the role of insulation and sealing.

[0049] By arranging an insulating member 14 at the second mounting hole 13 of the shell 10, when the power line passes through the second mounting hole 13, the second power line is insulated from the shell 10, thereby reducing the risk of mutual interference between the power line, the shell 10 and the sensor module 30, thereby improving the detection accuracy of the closed-loop Hall current sensor.

[0050] like Figure 4 , Figure 7 and Figure 8 As shown, in some embodiments, the sub-sensor assembly 33 includes: a magnetic focusing ring 34, a skeleton 35 and a Hall element (not shown in the figure), the magnetic focusing ring 34 is arranged on the circuit board 20, the magnetic focusing ring 34 is located in the shielding cover 31, the channel 32 is located in the magnetic focusing ring 34, and the magnetic focusing ring 34 has a first opening 340; the skeleton 35 is arranged on the circuit board 20, located at the first opening 340, and a secondary coil 36 is provided on the skeleton 35; the Hall element is arranged on the circuit board 20, located at the first opening 340.

[0051] The skeleton 35 may be made of polybutylene terephthalate (PBT) material with high heat resistance and high strength. PBT material is an important thermoplastic polyester and one of the five major engineering plastics.

[0052] The secondary coil 36 is made of enameled copper wire with high conductivity and strong corrosion resistance.

[0053] The magnetic concentrating ring 34 is made of a Permalloy material with high magnetic permeability, low coercive force and low hysteresis loss. The magnetic concentrating ring 34 can be a square ring structure with a first opening 340. At this time, the shielding cover 31 can be a square ring structure or a square ring structure with an opening. The shielding cover 31 can also be a circular ring structure or an elliptical ring structure, which is not specifically limited here.

[0054] The core component of the sub-sensor assembly 33 is a Hall element, which is usually made of semiconductor and soldered on the circuit board 20 .

[0055] The working principle of the above-mentioned single sub-sensor assembly 33 is as follows:

[0056] The magnetic field generated by the cable to be tested in the channel 32 is gathered by the magnetic focusing ring 34 and acts on the Hall element at the first opening 340 of the magnetic focusing ring 34, generating a Hall voltage. After being processed by the amplification circuit and the feedback circuit, the generated compensation current acts on the secondary coil 36 on the magnetic focusing ring 34 and generates a magnetic field opposite to the magnetic field of the cable to be tested, so that the Hall element is in a "zero flux" state. When the current in the cable to be tested changes, the compensation current changes accordingly; by measuring the size of the compensation current, real-time detection of the current to be tested can be achieved.

[0057] Specifically, Figure 6 and Figure 7 As shown, the magnetic focusing ring 34 is electrically connected to the circuit board 20 through the first conductive pin 41; the skeleton 35 is electrically connected to the circuit board 20 through the second conductive pin 42. The magnetic focusing ring 34 and the skeleton 35 are electrically connected to the circuit board 20 through the first conductive pin 41 and the second conductive pin 42. On the one hand, the magnetic focusing ring 34, the skeleton 35 and the circuit board 20 are mechanically and electrically fixed, which is conducive to improving the reliability of the sensor module 30. In addition, it is convenient to connect the magnetic focusing ring 34, the skeleton 35 and the circuit board 20, thereby improving the assembly accuracy and assembly efficiency of the sensor module 30.

[0058] like Figure 4 and Figure 7 As shown, in some embodiments, the shielding cover 31 is annular, so that the shielding cover 31 surrounds the magnetic focusing ring 34 to play a shielding role.

[0059] Specifically, when the magnetic focusing ring 34 may be a square ring structure with a first opening 340 , the shielding cover 31 may be in the shape of a square ring, a circular ring or an elliptical ring.

[0060] It should be noted that the above-mentioned ring shape includes a closed ring structure and a closed structure with an opening. When the shielding cover 31 is in a ring shape with an opening, the opening of the shielding cover 31 is opposite to the first opening 340 to surround the magnetic focusing ring 34. In this way, a better shielding effect can be achieved.

[0061] Furthermore, in order to improve the shielding effect, during the design process of the shielding cover 31, in addition to wrapping the magnetic focusing ring 34 on all sides, the height of the shielding cover 31 needs to be designed to be higher than the height of the magnetic focusing ring 34, so as to help spatially wrap the magnetic focusing ring 34 as a whole and achieve a better shielding effect.

[0062] In the design process of the shielding cover 31, in addition to the shape, the material and thickness of the shielding cover 31 are also relatively important.

[0063] When the shielding cover 31 is made of Permalloy, an iron-nickel alloy, if the shielding cover 31 is too thin, the shielding cover 31 is easily deformed, affecting the shielding effect; if the shielding cover 31 is too thick, not only a larger placement space needs to be reserved, but also the weight of the shielding cover 31 increases, wasting materials. When the thickness of the shielding cover 31 is designed to be 0.1mm to 0.4mm, the purpose of taking into account good shielding effect, small volume and low cost can be achieved.

[0064] The present invention adopts the Permalloy material of the iron-nickel alloy, and the thickness of the shielding cover 31 is 0.2 mm. In this way, the shielding cover 31 can achieve the purpose of good shielding effect, small volume and low cost.

[0065] Of course, the thickness of the shielding cover 31 can be not only 0.2 mm, but also 0.1, 0.11, 0.115, 0.12, 0.13, 0.133, 0.14, 0.145, 0.15, 0.16, 0.18, 0.23, 0.25, 0.28, 0.3, etc., and no specific limitation is made here.

[0066] like Figure 5 and Figure 7 As shown, in some embodiments, a support column 15 is provided on the bottom wall of the shell 10, specifically, a support column 15 is provided on the bottom wall of the shell body 11, the circuit board 20 is screwed to the support column 15, and the accommodating cavity 101 is divided into a first accommodating space 102 and a second accommodating space 103 by the circuit board 20, the support column 15 is located in the first accommodating space 102, and the sensor module 30 is located in the second accommodating space 103.

[0067] Compared with the circuit board 20 being directly fixed on the bottom wall of the shell body 11, the first accommodation space 102 is formed between the circuit board 20 and the bottom wall of the shell body 11. On the one hand, the risk of contact between the multiple sub-sensor components 33 on the circuit board 20 and the shell body 11 is reduced; moreover, the circuit board 20 and the shell body 11 are convenient for disassembly and assembly and firmly connected. At the same time, the first accommodation space 102 reserves space for the sub-sensor components 33 on the circuit board 20, for example, a avoidance space is reserved for the pins of the first conductive pin 41 and the second conductive pin 42 located in the second accommodation space 103 and connected to the circuit board 20, which can be extended into the first accommodation space 102, reducing the risk of short circuit between the first conductive pin 41 and the second conductive pin 42 and the shell body 11.

[0068] Specifically, a through hole 22 is provided at a position of the circuit board 20 corresponding to the support column 15 , and the fastener 23 passes through the through hole 22 and is screwed to the support column 15 , so that not only the circuit board 20 is firmly connected to the shell body 11 , but also the disassembly and assembly of the circuit board 20 is convenient.

[0069] The fasteners 23 may be screws, bolts, etc.

[0070] The assembly process of a single sensor module 30 is as follows:

[0071] First, the skeleton 35 wound with the secondary coil 36 is assembled into a whole with the magnetic focusing ring 34 through the first opening 340 of the magnetic focusing ring 34, and is welded to the circuit board 20 through the first conductive needle 41 and the second conductive needle 42; at the same time, the Hall element is welded at the first opening 340 of the magnetic focusing ring 34, so that a sub-sensor assembly 33 is formed. Figure 8 As shown, and then mounted on the circuit board 20;

[0072] Then the shielding cover 31 is welded to the periphery of the magnetic focusing ring 34 , thereby completing the assembly of a sensor module 30 .

[0073] The assembly of the multiple sensor modules 30 is as described above, which will not be repeated here.

[0074] Finally, the circuit board 20 with all the sensor modules 30 installed is fixed on the support column 15 of the shell body 11 by the fastener 23 .

[0075] In this embodiment, four cables to be tested are passed through four channels 32, and the four sensor modules 30 are connected to the circuit board 20 and the excitation power supply as shown in FIG. Fig. 9As shown. The circuit board 20 is provided with an input positive electrode and an input negative electrode, the input positive electrode is connected to the positive electrode of the excitation power supply, the input negative electrode on the circuit board 20 is connected to the negative electrode of the excitation power supply, each sensor module 30 has an output terminal, the output terminal of the sensor module 30 is connected to the positive electrode of the multimeter, and the negative electrode of the multimeter is connected to the com electrode of the excitation power supply. By checking the corresponding current measurement value on the multimeter, the current condition of the cable to be tested in the channel 32 can be determined. When wiring, the connection lines of the four channels 32 can be numbered to facilitate users to monitor the current conditions of multiple cables to be tested. In this way, when the closed-loop Hall current sensor detects 4 cables to be tested, it only needs to connect 2 power lines and 4 output lines of the detection channel 32, a total of 6 lines. Compared with the closed-loop Hall current sensor that only includes 1 channel 32 in the related art, each closed-loop Hall current sensor needs to connect 2 power lines and 1 output line of the detection channel 32, and 4 closed-loop Hall current sensors need to connect 12 lines. The closed-loop Hall current sensor of the present application has simple wiring and improves detection efficiency. At the same time, the detection of multiple channels 32 is independent of each other, and the detection accuracy is high.

[0076] It should be noted that, in addition to including four sensor modules 30, the closed-loop Hall current sensor may also include 2, 3, 5, 6, etc., which is not specifically limited here.

[0077] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0078] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A closed-loop Hall current sensor, characterized in that: include: A housing (10) having a receiving cavity (101); the housing (10) is provided with a plurality of first mounting holes (12); A circuit board (20) is arranged in the accommodating cavity (101), and a avoidance opening (21) is provided on the circuit board (20); A plurality of sensor modules (30) are arranged at intervals on the circuit board (20); the sensor module (30) comprises a shielding cover (31), a sub-sensor assembly (33) and a channel (32); the shielding cover (31) and the sub-sensor assembly (33) are arranged on the circuit board (20), and the sub-sensor assembly (33) is located inside the shielding cover (31); the channel (32) penetrates the circuit board (20) and the housing (10) along the thickness direction of the circuit board (20), and the end of the channel (32) corresponds to the first mounting hole (12) for the cable to be tested to pass through; the sub-sensor assembly (33) is used to detect the current of the cable to be tested located in the channel (32).

2. The closed-loop Hall current sensor according to claim 1, characterized in that: The sub-sensor assembly (33) comprises: A magnetic focusing ring (34) is arranged on the circuit board (20), the magnetic focusing ring (34) is located in the shielding cover (31), the channel (32) is located in the magnetic focusing ring (34), and the magnetic focusing ring (34) has a first opening (340); A frame (35) is arranged on the circuit board (20) and is located at the first opening (340); a secondary coil (36) is arranged on the frame (35); A Hall element is arranged on the circuit board (20) and is located at the first opening (340).

3. The closed-loop Hall current sensor according to claim 2, characterized in that: In the thickness direction of the circuit board (20), the height of the shielding cover (31) is greater than the height of the magnetic focusing ring (34).

4. The closed-loop Hall current sensor according to any one of claims 1 to 3, characterized in that: The shielding cover (31) is ring-shaped.

5. The closed-loop Hall current sensor according to any one of claims 1 to 3, characterized in that: The thickness of the shielding cover (31) is 0.1 mm to 0.5 mm.

6. The closed-loop Hall current sensor according to claim 2 or 3, characterized in that: The magnetic focusing ring (34) is electrically connected to the circuit board (20) via a first conductive needle; and the skeleton (35) is electrically connected to the circuit board (20) via a second conductive needle.

7. The closed-loop Hall current sensor according to any one of claims 1 to 3, characterized in that: The housing (10) is provided with a second mounting hole (13), and an insulating member (14) is provided at the second mounting hole (13). The insulating member (14) has a central hole for a power line to pass through, and the power line is electrically connected to the circuit board (20).

8. The closed-loop Hall current sensor according to any one of claims 1 to 3, characterized in that: The housing (10) is provided with a plurality of hole groups, the hole groups comprising a first mounting hole (12) arranged on the bottom wall of the housing (10) and a first mounting hole (12) arranged on the top wall of the housing (10); In the hole group, one of the first mounting holes (12) arranged on the bottom wall and one of the first mounting holes (12) arranged on the top wall are arranged opposite to each other; The channel (32) penetrates the shell (10) along the height direction of the shell (10), and the plurality of channels (32) correspond one-to-one to the plurality of hole groups.

9. The closed-loop Hall current sensor according to any one of claims 1 to 3, characterized in that: The shell (10) comprises a shell body (11) and a cover body, wherein the shell body (11) has the accommodating cavity (101); one end of the channel (32) is correspondingly connected to the first mounting hole (12) located on the bottom wall of the shell body (11), so that the channel (32) and the shell body (11) form an integrated structure.

10. The closed-loop Hall current sensor according to any one of claims 1 to 3, characterized in that: A support column (15) is provided on the bottom wall of the shell (10); the circuit board (20) is screwed to the support column (15); the accommodating cavity (101) is divided into a first accommodating space (102) and a second accommodating space (103) by the circuit board (20); the support column (15) is located in the first accommodating space (102); and the sensor module (30) is located in the second accommodating space (103).

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