Hall current sensor

Abstract

The utility model relates to a Hall current sensor. The Hall current sensor comprises a shell, a circuit board, an electric wire and an electric connector, the shell is provided with a containing cavity, and the circuit board is arranged in the containing cavity. The wire is provided with a first end and a second end which are opposite, the first end is located in the containing cavity and electrically connected with the circuit board, the second end is located outside the shell, and the electric connector is arranged at the second end and electrically connected with the wire. According to the Hall current sensor provided by the embodiment of the invention, the electric connector is separated from the shell by arranging the electric wire, namely the electric connector is separated from the shell, so that the size of the Hall current sensor can be reduced, the Hall current sensor can be mounted in a narrow space, and miniaturization of a product applying the Hall current sensor is facilitated. When the Hall current sensor provided by the embodiment is applied to a use occasion with a narrow space, the electric connector can be led out of the narrow space through the electric wire, so that the electric connector and a matching terminal on a measuring circuit can be conveniently installed in a plug-in manner.

Description

Technical Field

[0001] This application relates to the field of current sensor technology, and in particular to a Hall current sensor. Background Technology

[0002] Hall current sensors are important automated detection components, characterized by fast response, high measurement accuracy, and wide measurement range. They are widely used in industries such as manufacturing, automotive, computers, mobile phones, and emerging consumer electronics.

[0003] Common Hall current sensors have terminals directly mounted on the housing, which increases the size of the sensor and makes it impossible to install in a small space. Utility Model Content

[0004] Therefore, it is necessary to provide a Hall current sensor that can reduce the size of the Hall current sensor, so that the Hall current sensor can be installed in a small space.

[0005] A Hall current sensor, comprising:

[0006] The outer casing has a receiving cavity;

[0007] A circuit board, wherein the circuit board is disposed within the receiving cavity;

[0008] An electrical wire having a first end and a second end opposite to each other, the first end being disposed within the receiving cavity and electrically connected to the circuit board, and the second end being disposed outside the housing; and

[0009] An electrical connector, which is electrically connected to the second end.

[0010] In one embodiment, the Hall current sensor further includes a ring frame, a magnetic core, a coil, and a Hall element. The ring frame is disposed within the receiving cavity, the magnetic core is disposed within the ring frame, the coil is wound around the surface of the ring frame, the coil is electrically connected to the circuit board, the magnetic core has an air gap, the Hall element is disposed within the air gap, and the Hall element is electrically connected to the circuit board.

[0011] In one embodiment, the circuit board has two first sockets, the annular frame has two conductive elements, the two conductive elements are disposed in the two first sockets in a one-to-one correspondence, the two conductive elements are electrically connected to the circuit board, one end of the coil is electrically connected to one of the conductive elements, and the other end of the coil is electrically connected to the other conductive element.

[0012] In one embodiment, the inner circumferential surface of the annular frame is provided with two first supports. The two first supports are arranged circumferentially around the annular frame and are arranged opposite to the Hall element. One end of each of the two first supports is connected to one side of the outer shell, and the other end of each of the two first supports is connected to the two conductive elements one by one.

[0013] In one embodiment, the circuit board is further provided with a second socket; the annular frame is further provided with a positioning member, the positioning member being disposed in the second socket, and the end of the coil being wound around the positioning member.

[0014] In one embodiment, there are two second sockets and two positioning members. One positioning member is set at one end of the circumferential direction of the magnetic core, and the other positioning member is set at the other end of the circumferential direction of the magnetic core. The two positioning members are respectively set in the two second sockets. One end of the coil is wound around one of the positioning members, and the other end of the coil is wound around the other positioning member.

[0015] In one embodiment, the inner circumferential surface of the annular frame is further provided with a second support body, one end of the second support body is connected to one side of the outer shell, and the other end of the second support body is connected to the positioning member.

[0016] In one embodiment, the annular frame is provided with a fixing groove, the fixing groove is located in the air gap, and the Hall element is located in the fixing groove.

[0017] In one embodiment, the wire includes a positive connection wire, a negative connection wire, a signal transmission line, and a ground wire. The first end of the positive connection wire, the first end of the negative connection wire, the first end of the signal transmission line, and the first end of the ground wire are all electrically connected to the circuit board. The second end of the positive connection wire, the second end of the negative connection wire, the second end of the signal transmission line, and the second end of the ground wire are all electrically connected to the electrical connector.

[0018] In one embodiment, the housing includes a shell and a cover, the shell having the receiving cavity and an opening communicating with the receiving cavity, and the cover being disposed at the opening;

[0019] The housing includes a first side portion and a positioning ring. The first side portion is disposed opposite to the cover body. The first side portion has a first through hole, and the cover body has a second through hole. The positioning ring is disposed on the first side portion and has an axially penetrating through hole. The through hole communicates with the first through hole and the second through hole to allow the cable to be tested to pass through. The circuit board is sleeved on the positioning ring.

[0020] The aforementioned Hall current sensor, by separating the electrical connector from the housing through wires, reduces the sensor's size, allowing it to be installed in confined spaces. This facilitates miniaturization of products using the Hall current sensor described in this embodiment. When the Hall current sensor of this embodiment is used in space-constrained applications, the electrical connector can be led out of the confined space via wires, enabling convenient mating between the connector and the terminals on the measurement circuit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a Hall current sensor according to an embodiment of this application.

[0022] Figure 2 This is an exploded view of the structure of a Hall current sensor according to an embodiment of this application.

[0023] Figure 3 for Figure 2 The diagram shown is an exploded view of the Hall current sensor section.

[0024] Figure 4 This is a front view of the assembled circuit board, wires, and coil frame according to an embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the structure of a ring-shaped skeleton according to an embodiment of this application.

[0026] Figure 6 This is a schematic diagram of the circuit board and wires according to an embodiment of this application.

[0027] Figure 7 This is a schematic diagram of the structure of the housing according to an embodiment of this application.

[0028] Explanation of icon numbers:

[0029] 10. Outer shell; 11. Housing; 111. Receiving cavity; 112. Opening; 113. First side; 1131. First through hole; 12. Cover; 121. Second through hole; 13. Positioning ring; 131. Through hole; 20. Circuit board; 21. First socket; 22. Second socket; 23. Third socket; 24. Through hole; 30. Wire; 31. First end; 32. Second end; 40. Electrical connector; 50. Ring frame; 51. First support; 52. Second support; 53. Fixing groove; 60. Conductive component; 70. Positioning component; 80. Coil. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] See Figure 1 and Figure 2 One embodiment of this application provides a Hall current sensor, which includes a housing 10, a circuit board 20, a wire 30, and an electrical connector 40.

[0032] In one embodiment, see Figure 2 The housing 10 has a receiving cavity 111, and the circuit board 20 is disposed in the receiving cavity 111. The wire 30 has a first end 31 and a second end 32 opposite to each other. The first end 31 is located in the receiving cavity 111 and is electrically connected to the circuit board 20, and the second end 32 is located outside the housing 10. The electrical connector 40 is disposed at the second end 32 and is electrically connected to the wire 30.

[0033] The aforementioned Hall current sensor, by using a wire 30 to separate the electrical connector 40 from the housing 10, i.e., by separately configuring the electrical connector 40 and the housing 10, reduces the size of the Hall current sensor, allowing it to be installed in confined spaces. This facilitates the miniaturization of products using the Hall current sensor of this embodiment. When the Hall current sensor of this embodiment is used in confined spaces, the wire 30 can be used to extend the electrical connector 40 out of the confined space, facilitating the mating of the electrical connector 40 with the mating terminals on the measurement circuit.

[0034] In one embodiment, the electrical connector 40 is a terminal block. Specifically, the terminal block includes a terminal base and a terminal body, the terminal base having a wiring hole, and the terminal body being disposed within the wiring hole.

[0035] In one embodiment, the wire 30 includes a positive connection wire, a negative connection wire, a signal transmission line, and a ground wire. The first end 31 of the positive connection wire, the first end 31 of the negative connection wire, the first end 31 of the signal transmission line, and the first end 31 of the ground wire are all electrically connected to the circuit board 20, and the second end 32 of the positive connection wire, the second end 32 of the negative connection wire, the second end 32 of the signal transmission line, and the second end 32 of the ground wire are all electrically connected to the terminal block.

[0036] Specifically, there are four wiring holes and four terminal bodies, with each terminal body corresponding to one of the four wiring holes. The second end 32 of the positive connection wire, the second end 32 of the negative connection wire, the second end 32 of the signal transmission wire, and the second end 32 of the grounding wire are each corresponding to one of the four wiring holes and are electrically connected to each of the four terminal bodies.

[0037] In one embodiment, the Hall current sensor is a closed-loop Hall current sensor, i.e., a zero-flux Hall current sensor.

[0038] Specifically, see Figure 2 and Figure 3 The Hall current sensor also includes a ring frame 50, a magnetic core, a coil 80, and a Hall element. The ring frame 50 is disposed within the receiving cavity 111 and has a hollow structure. The magnetic core is disposed within the ring frame 50. The coil 80 is wound around the surface of the ring frame 50 and is electrically connected to the circuit board 20. The magnetic core has an air gap, and the Hall element is disposed in the air gap and electrically connected to the circuit board 20.

[0039] It should be noted that the magnetic core is a non-closed toroidal shape, and the break in the magnetic core is the air gap.

[0040] When the magnetic flux generated by the primary current is concentrated in the magnetic circuit through the magnetic core, the Hall element, fixed in the air gap, detects the magnetic flux. A multi-turn coil 80 wound around the magnetic core outputs a reverse compensation current to cancel out the magnetic flux generated by the primary current, ensuring that the magnetic flux in the magnetic circuit remains zero. Through special circuit processing, the output of the Hall current sensor can accurately reflect the current change of the primary current.

[0041] In one embodiment, see Figure 5 The annular frame 50 is provided with a fixing groove 53. The fixing groove 53 is located in the air gap, and the Hall element is located in the fixing groove 53. In this way, by providing a fixing groove 53, the fixing groove 53 can provide an installation position for the Hall element, which is convenient for the Hall element to be installed. At the same time, the groove wall of the fixing groove 53 can limit the Hall element, prevent the Hall element from shaking, and ensure that the Hall element can accurately output the current change that reflects the primary current.

[0042] In one embodiment, see Figure 3 , Figure 5 and Figure 6 The circuit board 20 has two first sockets 21. The annular frame 50 has two conductive elements 60, which are correspondingly disposed in the two first sockets 21 and are electrically connected to the circuit board 20. One end of the coil 80 is electrically connected to one of the conductive elements 60, and the other end of the coil 80 is electrically connected to the other conductive element 60.

[0043] Optionally, the conductive element 60 is electrically connected to the circuit on the circuit board 20 by soldering.

[0044] In one embodiment, see Figure 3 and Figure 5 Two first supports 51 are provided on the inner circumferential surface of the annular frame 50. The two first supports 51 are spaced apart along the circumference of the annular frame 50 and positioned opposite the Hall element. One end of each first support 51 is connected to one side of the housing 10, and the other end is connected to one of the two conductive elements 60. Thus, the first supports 51 provide support for the annular frame 50 and the magnetic core, while also providing mounting positions for the conductive elements 60, facilitating their installation. Furthermore, placing the first supports 51 on the inner circumferential surface of the annular frame 50 saves space and avoids increasing the size of the Hall current sensor.

[0045] Further, see Figure 4 The end of the first support 51 opposite to the conductive element 60 protrudes from the end face of the annular frame 50, so that there is a gap between the annular frame 50 and the outer shell 10 for the coil 80 to pass through.

[0046] In one embodiment, see Figure 3 , Figure 5 and Figure 6 The circuit board 20 is provided with a second insertion hole 22. The annular frame 50 is provided with a positioning member 70, which is disposed in the second insertion hole 22. By cooperating with the second insertion hole 22, the circuit board 20 can be positioned so that the circuit board 20 can be quickly installed in a designated position.

[0047] Further, see Figure 5 The end of coil 80 is wound around positioning member 70. It should be noted that the number of turns of the end of coil 80 wound around positioning member 70 can be set according to actual needs. By winding the end of coil 80 around positioning member 70, the enameled wire can be fixed, making it easier for the enameled wire to be wound around the annular frame 50 to form coil 80.

[0048] In this embodiment, see Figure 5 and Figure 6 The second insertion hole 22 and the positioning member 70 are both provided in pairs. One positioning member 70 is set at one end of the circumferential direction of the magnetic core, and the other positioning member 70 is set at the other end of the circumferential direction of the magnetic core. The two positioning members 70 are arranged one-to-one in the two second insertion holes 22. One end of the coil 80 is wound around one positioning member 70, and the other end of the coil 80 is wound around the other positioning member 70. Since the two positioning members 70 are respectively set at both ends of the circumferential direction of the magnetic core, the two positioning members 70 are respectively set close to both ends of the coil 80, which makes it convenient for the end of the coil 80 to be wound around the positioning member 70.

[0049] In one embodiment, a second support 52 is further provided on the inner circumferential surface of the annular frame 50. Specifically, the second support 52 is positioned corresponding to the Hall element. One end of the second support 52 is connected to one side of the housing 10, and the other end is connected to the positioning member 70. Thus, the second support 52 provides support for the annular frame 50 and the magnetic core, while also providing an installation position for the positioning member 70, facilitating its installation. Furthermore, placing the second support 52 on the inner circumferential surface of the annular frame 50 saves space and avoids increasing the size of the Hall current sensor.

[0050] It should be noted that since the first support 51 is positioned opposite to the Hall element and the second support 52 is positioned corresponding to the Hall element, the first support 51 and the second support 52 can support both sides of the annular frame 50, ensuring the support effect.

[0051] In this embodiment, the distance between the two first supports 51 is greater than the distance between the two second supports 52. The coil 80 is made of enameled wire. The method of winding the enameled wire onto the annular frame 50 is as follows: first, the beginning end of the enameled wire is soldered to one of the conductive parts 60, and then the enameled wire is pulled to one of the positioning parts 70 so that the enameled wire is wound around the positioning part 70. Then, the enameled wire is wound around the annular frame 50 with the positioning part 70 as the starting position until another positioning part 70 is reached. Then, the enameled wire continues to be wound around the other positioning part 70, and then the enameled wire is pulled to another conductive part 60. Finally, the end of the enameled wire is soldered to the other conductive part 60.

[0052] Since the enameled wire needs to maintain a certain tension during the winding process of the ring skeleton 50 to ensure the winding effect, the positioning member 70 can provide sufficient tension to the enameled wire by winding the enameled wire around it. This prevents the problem that the starting end of the enameled wire may not be able to provide sufficient tension after being soldered to the conductive member 60 and may be easily pulled off.

[0053] The small gap between the two second supports 52 results in a small gap between the two positioning pieces 70. The two positioning pieces 70 serve as the starting and ending positions for the winding of the enameled wire into the annular frame 50, making full use of the circumference of the annular frame 50 and ensuring the number of coil turns.

[0054] Further, see Figure 4The second support 52 protrudes from the end face of the annular frame 50 away from the conductive element 60, creating a gap between the annular frame 50 and the outer casing 10 for the coil 80 to pass through. In one embodiment, the circuit board 20 also has a third socket 23, where the pins of the Hall element are located and electrically connected to the circuit board 20. Optionally, the pins of the Hall element are electrically connected to the circuit on the circuit board 20 by soldering. This achieves electrical connection between the Hall element and the circuit board 20.

[0055] In one embodiment, see Figure 2 The housing 10 includes a housing 11 and a cover 12. The housing 11 has a receiving cavity 111 and an opening 112 communicating with the receiving cavity 111, and the cover 12 is disposed in the opening 112. During installation, the circuit board 20 and the annular frame 50 are placed in the receiving cavity 111, and then the cover 12 is disposed in the opening 112 to enclose the circuit board 20 and the annular frame 50 in the receiving cavity 111, preventing interference from external substances and ensuring the service life of the Hall current sensor.

[0056] In some embodiments, the cover 12 may not be necessary. During installation, the circuit board 20 and the annular skeleton 50 are placed in the receiving cavity 111, and then glue is poured into the receiving cavity 111. After the glue cures, the circuit board 20 and the annular skeleton 50 are sealed in the receiving cavity 111.

[0057] In one embodiment, see Figure 2 and Figure 7 The housing 11 includes a first side portion 113, which is disposed opposite to the cover 12. The first side portion 113 is provided with a first through hole 1131, and the cover 12 is provided with a second through hole 121, which are disposed opposite to each other.

[0058] Further, see Figure 7 The housing 10 also includes a positioning ring 13. The positioning ring 13 is located on the first side portion 113, and optionally, it extends from the wall of the first through hole 1131 toward the opening 112. The positioning ring 13 has an axially penetrating through hole 131, which communicates with the first through hole 1131 and the second through hole 121. In use, the cable to be tested is passed through the first through hole 1131, the second through hole 121, and the through hole 131.

[0059] Furthermore, the circuit board 20 is provided with a through hole 24, through which the circuit board 20 is fitted onto the positioning ring 13. The annular frame 50 is fitted onto the positioning ring 13. In this way, the positioning ring 13 plays a positioning role for the circuit board 20 and the annular frame 50, so that the circuit board 20 and the annular frame 50 can be quickly installed in the designated position.

[0060] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A Hall current sensor, characterized in that, include: The outer casing has a receiving cavity; A circuit board, wherein the circuit board is disposed within the receiving cavity; An electrical wire having a first end and a second end opposite to each other, the first end being disposed within the receiving cavity and electrically connected to the circuit board, and the second end being disposed outside the housing; and An electrical connector, which is electrically connected to the second end.

2. The Hall current sensor according to claim 1, characterized in that, The Hall current sensor further includes a ring frame, a magnetic core, a coil, and a Hall element. The ring frame is disposed within the receiving cavity, the magnetic core is disposed within the ring frame, the coil is wound around the surface of the ring frame, the coil is electrically connected to the circuit board, the magnetic core has an air gap, the Hall element is disposed within the air gap, and the Hall element is electrically connected to the circuit board.

3. The Hall current sensor according to claim 2, characterized in that, The circuit board has two first sockets, and the annular frame has two conductive elements. The two conductive elements are disposed in the two first sockets in a one-to-one correspondence. Both conductive elements are electrically connected to the circuit board. One end of the coil is electrically connected to one of the conductive elements, and the other end of the coil is electrically connected to the other conductive element.

4. The Hall current sensor according to claim 3, characterized in that, The inner circumferential surface of the annular frame is provided with two first supports. The two first supports are arranged at intervals along the circumference of the annular frame and are arranged opposite to the Hall element. One end of each of the two first supports is connected to one side of the outer shell, and the other end of each of the two first supports is connected to the two conductive components one by one.

5. The Hall current sensor according to claim 2, characterized in that, The circuit board is also provided with a second socket; the annular frame is also provided with a positioning member, which is located in the second socket, and the end of the coil is wound around the positioning member.

6. The Hall current sensor according to claim 5, characterized in that, The second socket and the positioning member are provided in twos. One of the positioning members is set at one end of the circumferential direction of the magnetic core, and the other positioning member is set at the other end of the circumferential direction of the magnetic core. The two positioning members are respectively set in the two second sockets. One end of the coil is wound around one of the positioning members, and the other end of the coil is wound around the other positioning member.

7. The Hall current sensor according to claim 5, characterized in that, The inner circumferential surface of the ring-shaped frame is also provided with a second support body. One end of the second support body is connected to one side of the outer shell, and the other end of the second support body is connected to the positioning member.

8. The Hall current sensor according to claim 2, characterized in that, The annular frame is provided with a fixing groove, which is located in the air gap, and the Hall element is located in the fixing groove.

9. The Hall current sensor according to any one of claims 1 to 8, characterized in that, The wire includes a positive connection wire, a negative connection wire, a signal transmission wire, and a ground wire. The first end of the positive connection wire, the first end of the negative connection wire, the first end of the signal transmission wire, and the first end of the ground wire are all electrically connected to the circuit board. The second end of the positive connection wire, the second end of the negative connection wire, the second end of the signal transmission wire, and the second end of the ground wire are all electrically connected to the electrical connector.

10. The Hall current sensor according to any one of claims 1 to 8, characterized in that, The outer casing includes a housing and a cover, the housing having the receiving cavity and an opening communicating with the receiving cavity, and the cover being disposed at the opening; The housing includes a first side portion and a positioning ring. The first side portion is disposed opposite to the cover body. The first side portion has a first through hole, and the cover body has a second through hole. The positioning ring is disposed on the first side portion and has an axially penetrating through hole. The through hole communicates with the first through hole and the second through hole to allow the cable to be tested to pass through. The circuit board is sleeved on the positioning ring.

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