Current sensor and detection device

Abstract

The utility model relates to the technical field of electronic detection, in particular to a current sensor and a detection device. The current sensor comprises an iron core component and a circuit board, the iron core component comprises an iron core supporting ring and an iron core assembly, the iron core supporting ring comprises a first end portion located at one axial end of the iron core supporting ring, a groove is formed in the first end portion, and the iron core assembly is arranged in the groove; the circuit board is arranged at the first end part and is connected with the iron core supporting ring; the first shielding sheet is arranged on one side, deviating from the iron core component, of the circuit board; wherein the circuit board is provided with an avoiding hole, the first end part is provided with a limiting column, and the limiting column penetrates through the avoiding hole and is used for abutting against the first shielding sheet, so that an avoiding gap is formed between the circuit board and the first shielding sheet, and the circuit board can be prevented from being in contact with the first shielding sheet; and the possibility of short circuit caused by contact between the circuit board and the first shielding sheet is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic detection technology, and in particular to a current sensor and a detection device. Background Art

[0002] Current sensors are used in various applications for monitoring or controlling electronic devices and systems, such as new energy vehicle motor control systems, battery management systems, industrial control systems, etc. In these applications, with the development of technology, more requirements are put forward for current sensors, among which current sensors are generally provided with through holes, through which wires or busbars pass, and sensors detect the current. In the process of using traditional current sensors, the shielding sheet is easy to loosen, and the loose shielding sheet may contact the circuit board and cause a short circuit. Summary of the invention

[0003] The present disclosure provides a current sensor and a detection device to at least solve the above technical problems existing in the prior art.

[0004] A first aspect of the present disclosure provides a current sensor, comprising:

[0005] An iron core component, the iron core component comprises an iron core support ring and an iron core assembly, the iron core support ring comprises a first end portion located at one axial end of the iron core support ring, the first end portion is provided with a groove, and the iron core assembly is arranged in the groove;

[0006] A circuit board, disposed at the first end portion and connected to the core support ring;

[0007] A first shielding sheet, arranged on a side of the circuit board away from the core component;

[0008] The circuit board is provided with an avoidance hole, the first end is provided with a limiting column, and the limiting column is passed through the avoidance hole to abut against the first shielding sheet to form an avoidance gap between the circuit board and the first shielding sheet.

[0009] Furthermore, there are multiple limiting posts, and the multiple limiting posts are arranged in a ring array.

[0010] Furthermore, the current sensor further comprises a shell cover, the shell cover is provided with a first positioning column, the first shielding sheet is provided with a first positioning hole, and the first positioning column is engaged with the first positioning hole.

[0011] Furthermore, the current sensor also includes:

[0012] A shell, the shell is snap-fitted with the shell cover, the shell having a central through hole and an annular groove surrounding the central through hole;

[0013] A second shielding sheet is disposed in the annular groove and connected to the housing.

[0014] The core component is annular, is disposed in the annular groove and surrounds the central through hole, the core support ring includes a second end away from the first end, and the second shielding sheet is disposed at the second end.

[0015] Furthermore, the shell is provided with a second positioning column, the second shielding sheet is provided with a second positioning hole, and the second positioning column is snap-fitted with the second positioning hole.

[0016] Furthermore, the current sensor also includes a shielding ring, which is annular;

[0017] The second end portion is provided with a clamping groove, the clamping groove is arranged around the annular groove, the shielding ring is arranged in the annular groove, and is clamped with the core supporting ring.

[0018] Furthermore, one of the shell and the shell cover is provided with a protrusion, and the other of the shell and the shell cover is provided with a snap-fitting hole, and the protrusion is snap-fitted with the snap-fitting hole.

[0019] Furthermore, the first end portion is provided with a first wire groove and a second wire groove.

[0020] Furthermore, the core assembly includes a core protective sleeve, a core, a core protective cover and a coil;

[0021] The core protection sleeve is provided with an installation groove, the core is arranged in the installation groove, the core protection cover is connected to the core protection sleeve, and the coil is wound around the core protection sleeve and the core protection cover.

[0022] A second aspect of the present disclosure provides a detection device, comprising the current sensor described in the first aspect.

[0023] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0024] The current sensor provided by an embodiment of the present disclosure includes an iron core component, a circuit board, and a first shielding sheet. The iron core component includes an iron core support ring and an iron core assembly. The iron core support ring includes a first end portion located at one end of the axial direction of the iron core support ring. A groove is formed in the first end portion, and the iron core assembly is disposed in the groove. The circuit board is disposed at the first end portion and connected to the iron core support ring. The first shielding sheet is disposed on a side of the circuit board facing away from the iron core component. Wherein, an avoidance hole is formed in the circuit board, and a limiting post is provided at the first end portion. The limiting post passes through the avoidance hole and is used to abut against the first shielding sheet, so as to form an avoidance gap between the circuit board and the first shielding sheet. Since there is an avoidance gap between the circuit board and the first shielding sheet, the avoidance gap can isolate the circuit board from the first shielding sheet, avoid contact between the circuit board and the first shielding sheet, reduce the possibility of short circuit caused by contact between the circuit board and the first shielding sheet, and improve the safety of the current sensor. The current sensor provided by the embodiment of the present disclosure has a simple structure and is easy to implement.

[0025] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By referring to the drawings and reading the detailed description below, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become easily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, wherein:

[0027] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0028] Figure 1 A schematic structural diagram of the current sensor provided by an embodiment of the present disclosure is shown;

[0029] Figure 2 An exploded view of the current sensor provided by an embodiment of the present disclosure is shown Figure 1 ;

[0030] Figure 3 An exploded view of the current sensor provided by an embodiment of the present disclosure is shown Figure 2 ;

[0031] Figure 4 A schematic partial structural diagram of the current sensor provided by an embodiment of the present disclosure is shown;

[0032] Figure 5 A schematic structural diagram of the connection between the first shielding sheet and the shell cover;

[0033] Figure 6 A schematic structural diagram of the connection between the second shielding sheet and the housing;

[0034] Figure 7 A schematic cross-sectional view of a current sensor provided by an embodiment of the present disclosure is shown;

[0035] Figure 8 An exploded view of a middle core component of a current sensor provided by an embodiment of the present disclosure is shown;

[0036] Figure 9 An exploded view of a middle core assembly of a current sensor provided by an embodiment of the present disclosure is shown.

[0037] Explanation of the numbers in the figure: 1. core support ring; 11. first end; 111. groove; 112. limit column; 113. first wire groove; 114. second wire groove; 12. second end; 121. slot; 13. avoidance gap; 14. adapter pin; 2. core assembly; 21. core protection cover; 211. mounting groove; 22. core; 23. core cover; 24. coil; 3. circuit board; 31. avoidance hole; 4. first shielding plate; 41. first positioning hole; 5. shell cover; 51. first positioning column; 52. snap-in hole; 6. shell; 61. second positioning column; 62. protrusion; 63. annular groove; 64. center through hole; 7. second shielding plate; 71. second positioning hole; 8. shielding ring. DETAILED DESCRIPTION

[0038] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0039] Shielding sheets can be used to shield magnetic leakage from core components to prevent electromagnetic interference.

[0040] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the current sensor provided by the embodiment of the present disclosure includes an iron core component, a circuit board 3 and a first shielding plate 4. The circuit board 3 can be a PCBA board. The iron core component includes an iron core support ring 1 and an iron core assembly 2. The iron core support ring 1 includes a first end 11 located at one axial end of the iron core support ring 1. The first end 11 is provided with a groove 111, and the iron core assembly 2 is arranged in the groove 111; the circuit board 3 is arranged at the first end 11 and connected to the iron core support ring 1; the first shielding plate 4 is arranged on the side of the circuit board 3 away from the iron core component. Among them, the circuit board 3 is provided with an avoidance hole 31, and the first end 11 is provided with a limiting column 112. The limiting column 112 is penetrated through the avoidance hole 31 for abutting against the first shielding plate 4, so that an avoidance gap 13 is formed between the circuit board 3 and the first shielding plate 4. Since the circuit board 3 and the first shielding sheet 4 have an avoidance gap 13, the avoidance gap 13 can separate the circuit board 3 and the first shielding sheet 4, and can avoid the circuit board 3 from contacting the first shielding sheet 4, thereby reducing the possibility of a short circuit caused by contact between the circuit board 3 and the first shielding sheet 4, and improving the safety of the current sensor. The current sensor provided by the embodiment of the present disclosure has a simple structure and is easy to implement.

[0041] In this embodiment, the structure is reliable, the core components are reasonably designed, the core support ring 1 ensures that the core, the coil 24 and the shielding ring 8 are assembled reliably without interfering with each other, and the structure is simple and easy to implement.

[0042] In some specific embodiments, the core assembly 2 is placed into the groove 111 above the core support ring 1, and the input and output wires on the side with more turns are led out along the narrow side wiring groove and wrapped around to the input and output welding pins on both sides of the core support ring 1; the input and output wires on the side with fewer turns are led out along the wide side wiring groove and wrapped around to the input and output welding pins on both sides of the core support ring 1.

[0043] In some specific embodiments, the core support ring 1 has four adapter pins 14. Optionally, the support ring has four bosses, and the bosses are provided with holes. The adapter pins 14 can be inserted into the corresponding holes and fixed after tooling, or can be pre-injected into one piece with the core support ring 1. The adapter pins 14 are connected to the circuit board 3. Optionally, the adapter pins 14 are welded after being plugged into the circuit board 3, which can improve the stability of the connection.

[0044] The core support ring 1 has two wire grooves corresponding to the wiring of the multi-turn coil 24 and the small-turn coil 24 respectively;

[0045] In some specific embodiments, there are multiple limit columns 112, and the multiple limit columns 112 are arranged in a circular array, so that the circuit board 3 and the first shielding plate 4 have an avoidance gap 13. The avoidance gap 13 can separate the circuit board 3 and the first shielding plate 4, and can avoid the circuit board 3 from contacting the first shielding plate 4, thereby reducing the possibility of short circuit due to contact between the circuit board 3 and the first shielding plate 4, and improving the safety of the current sensor.

[0046] As Figure 5 shown, the current sensor further includes a shell cover 5. The shell cover 5 is provided with a first positioning post 51, and the first shielding sheet 4 is provided with a first positioning hole 41. The first positioning post 51 is in snap-fit with the first positioning hole 41, which can improve the stability of the first shielding sheet 4 and reduce the possibility of the first shielding sheet 4 falling off. Optionally, the first positioning post 51 is in snap-fit with the first positioning hole 41, and the first shielding sheet 4 is fixed by press-fitting the first positioning post 51 with interference, which can reduce the possibility of the first shielding sheet 4 falling off and improve the stability of the current sensor.

[0047] Combined with Figure 1 , Figure 2 and Figure 3 shown, the current sensor further includes: a housing 6 and a second shielding sheet 7. The housing 6 is in snap-fit with the shell cover 5, which has the advantage of convenient disassembly and assembly. After the housing 6 is connected to the shell cover 5, it avoids the phenomenon that the circuit board 3 and its components are exposed to the air or vibration, etc., resulting in unstable operation of the current sensor, and improves the stability and detection accuracy of the current sensor during operation.

[0048] The housing 6 has a central through hole 64 and an annular groove 63 surrounding the central through hole 64; the second shielding sheet 7 is disposed in the annular groove 63 and connected to the housing 6. Among them, the iron core component is annular, the iron core component is disposed in the annular groove 63 and surrounds the central through hole 64, the iron core support ring 1 includes a second end 12 facing away from the first end 11, and the second shielding sheet 7 is disposed at the second end 12. After the housing 6 is connected to the shell cover 5, it can prevent foreign impurities from entering the annular groove 63.

[0049] As Figure 6 shown, the housing 6 is provided with a second positioning post 61, and the second shielding sheet 7 is provided with a second positioning hole 71. The second positioning post 61 is in snap-fit with the second positioning hole 71, which can improve the stability of the second shielding sheet 7 and reduce the possibility of the second shielding sheet 7 falling off. Optionally, the second positioning post 61 is in snap-fit with the second positioning hole 71, and the second shielding sheet 7 is fixed by press-fitting the second positioning post 61 with interference, which can reduce the possibility of the second shielding sheet 7 falling off and improve the stability of the current sensor.

[0050] Combined with Figure 7 and Figure 8As shown, the current sensor further includes a shielding ring 8, and the shielding ring 8 is annular; a clamping groove 121 is provided in the second end portion 12, the clamping groove 121 is arranged around the annular groove 63, the shielding ring 8 is arranged in the annular groove 63 and is clamped with the iron core support ring 1. The annular shielding ring is installed from the clamping groove 121 at the second end portion 12 of the iron core support ring 1, and the shielding ring 8 is clamped with the clamping groove 121, which can improve the stability of the shielding ring 8 and reduce the possibility of the shielding ring 8 falling off. Specifically, the shielding ring 8 is assembled by the friction of the clamping groove 121, or can be pre-injected with the iron core support ring 1 to further improve the stability of the shielding ring 8.

[0051] In some specific embodiments, one of the housing 6 and the housing cover 5 is provided with a protrusion 62, and the other of the housing 6 and the housing cover 5 is provided with a clamping hole 52. The protrusion 62 is in clamping fit with the clamping hole 52, which has the advantage of being convenient for disassembly and assembly and is convenient for production.

[0052] In some specific embodiments, the first end portion 11 is provided with a first wire groove 113 and a second wire groove 114. The first wire groove 113 corresponds to the multi-turn coil 24, and the second wire groove 114 corresponds to the routing of the few-turn coil 24.

[0053] As Figure 9 shown, the iron core assembly 2 includes an iron core protective sleeve 21, an iron core 22, an iron core cover 23 and a coil 24; the iron core protective sleeve 21 is provided with an installation groove 211, the iron core 22 is arranged in the installation groove 211, the iron core cover 23 is connected with the iron core protective sleeve 21, and the coil 24 is wound around the iron core protective sleeve 21 and the iron core cover 23. The iron core is formed by winding a material with high magnetic permeability and low remanence, placed in the iron core sheath, and then the iron core cover 23 is sealed for protection. The iron core sheath and the iron core cover 23 are in interference fit. After the iron core sheath and the iron core cover 23 are wound with wires, they form an iron core sheath. Thus, the current sensor in the sealed form further improves the detection accuracy of the current sensor.

[0054] The current sensor provided by the embodiment of the present disclosure has a compact structure, small space, convenient assembly and is convenient for production.

[0055] Through the arrangement of the first shielding sheet 4, the second shielding sheet 7 and the shielding ring 8, the current sensor has a good shielding effect, fully shields the periphery of the iron core, and has strong anti-interference ability.

[0056] The detection device provided by the embodiment of the present disclosure includes the current sensor provided by the embodiment of the present disclosure. Since the detection device provided by the embodiment of the present disclosure has the same advantages as the current sensor provided by the embodiment of the present disclosure, it will not be elaborated here.

[0057] It should be understood that the various forms of processes shown above can be used, with steps reordered, added or deleted. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and no limitations are imposed herein.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "a plurality" means two or more, unless otherwise specifically defined.

[0059] The above is only the specific implementation manner of this disclosure, but the protection scope of this disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by this disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure shall be subject to the protection scope of the claims.

Claims

1. A current sensor, characterized in that: include: An iron core component, the iron core component comprising an iron core support ring (1) and an iron core assembly (2), the iron core support ring (1) comprising a first end portion (11) located at one axial end of the iron core support ring (1), the first end portion (11) being provided with a groove (111), and the iron core assembly (2) being arranged in the groove (111); A circuit board (3) is arranged at the first end (11) and connected to the core support ring (1); A first shielding sheet (4) is arranged on a side of the circuit board (3) facing away from the iron core component; The circuit board (3) is provided with an avoidance hole (31), the first end portion (11) is provided with a limiting column (112), and the limiting column (112) is passed through the avoidance hole (31) and is used to abut against the first shielding sheet (4), so that an avoidance gap (13) is formed between the circuit board (3) and the first shielding sheet (4).

2. The current sensor according to claim 1, characterized in that: The number of the limiting posts (112) is plural, and the plurality of limiting posts (112) are arranged in a ring array.

3. The current sensor according to claim 1, characterized in that: It also comprises a shell cover (5), the shell cover (5) is provided with a first positioning column (51), the first shielding sheet (4) is provided with a first positioning hole (41), and the first positioning column (51) is snap-fitted with the first positioning hole (41).

4. The current sensor according to claim 3, characterized in that: Also includes: A shell (6), the shell (6) being snap-fitted with the shell cover (5), the shell (6) having a central through hole (64) and an annular groove (63) surrounding the central through hole (64); A second shielding sheet (7) is disposed in the annular groove (63) and connected to the housing (6). The core component is annular, arranged in the annular groove (63) and surrounding the central through hole (64), the core support ring (1) includes a second end (12) facing away from the first end (11), and the second shielding sheet (7) is arranged at the second end (12).

5. The current sensor according to claim 4, characterized in that: The housing (6) is provided with a second positioning column (61), the second shielding sheet (7) is provided with a second positioning hole (71), and the second positioning column (61) is snap-fitted with the second positioning hole (71).

6. The current sensor according to claim 4, characterized in that: It also includes a shielding ring (8), which is annular in shape; The second end portion (12) is provided with a clamping groove (121), the clamping groove (121) is arranged around the annular groove (63), and the shielding ring (8) is arranged in the annular groove (63) and clamped with the core support ring (1).

7. The current sensor according to claim 4, characterized in that: One of the shell (6) and the shell cover (5) is provided with a protrusion (62), and the other of the shell (6) and the shell cover (5) is provided with a snap-fitting hole (52), and the protrusion (62) is snap-fitted with the snap-fitting hole (52).

8. The current sensor according to claim 4, characterized in that: The first end portion (11) is provided with a first wire groove (113) and a second wire groove (114).

9. The current sensor according to claim 1, characterized in that: The iron core assembly (2) comprises an iron core protective sleeve (21), an iron core (22), an iron core protective cover (23) and a coil (24); The iron core protection sleeve (21) is provided with a mounting groove (211), the iron core (22) is arranged in the mounting groove (211), the iron core protection cover (23) is connected to the iron core protection sleeve (21), and the coil (24) is wound around the iron core protection sleeve (21) and the iron core protection cover (23).

10. A detection device, characterized in that: A current sensor comprising any one of claims 1 to 9.

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