Conductor member and printed circuit board assembly

Abstract

The embodiment of the utility model provides a conductor piece and a printed circuit board assembly. The conductor piece is suitable for being fixed on a PCB and measuring the magnitude of current passing through the conductor piece through the Hall current sensor, and the conductor piece comprises a first section which is suitable for being arranged in an inner hole of a shell of the Hall current sensor in a penetrating mode; the second section extends from the first end of the first section and is suitable for being connected with a first position of the PCB; the third section extends from the second end of the first section and is suitable for being connected with a second position of the PCB, at least one of the second section and the third section is of a bent structure, and the bent structure extends from the first section to one side of the first section in a bent mode on a plane perpendicular to the first section.

Description

Technical Field

[0001] The embodiments of this disclosure relate to the field of current detection technology, and more specifically to a conductor and printed circuit board assembly. Background Technology

[0002] A Hall current sensor is a circuit instrument based on the Hall effect, used to measure the magnitude of current flowing through a conductor. The Hall current sensor includes a housing and a Hall element, a magnetic core, and circuitry mounted within the housing. The magnetic core has an open toroidal structure with an air gap between its two ends. The housing has an inner hole that corresponds to the inner hole of the magnetic core. The Hall element is disposed within the air gap. The circuitry includes a compensation winding wound around the magnetic core and signal processing circuitry on a circuit board mounted within the housing.

[0003] A Hall current sensor can be mounted on a PCB board to measure the current flowing through a copper busbar on the PCB. The copper busbar passes through the inner hole of the Hall current sensor's housing, and its two ends are soldered to different locations on the PCB board. When current flows through the copper busbar, a magnetic field is generated around it. This magnetic field is concentrated by the magnetic core and sensed by the Hall element located in the air gap of the core. The Hall element detects the magnetic field generated by the current flowing through the copper busbar and outputs a signal. This signal is amplified by a signal processing circuit and drives a compensation winding to generate a magnetic field of equal magnitude but opposite direction to the magnetic field generated by the current flowing through the copper busbar. This cancels out the magnetic field generated by the current flowing through the copper busbar, bringing the Hall element to a zero-flux state. During this compensation process, current flows through the compensation winding, and the current flowing through the compensation winding is linearly related to the current flowing through the copper busbar. Thus, by detecting the voltage or current signal output by the compensation winding, the magnitude of the current flowing through the copper busbar can be accurately measured.

[0004] The current detection accuracy of a Hall current sensor depends not only on its own design specifications but also on the structure of the copper busbar. Existing copper busbars typically have an inverted U-shaped structure, consisting of a horizontal section and two vertical sections extending perpendicularly from both ends of the horizontal section onto the PCB board. The horizontal section passes through the inner hole of the Hall current sensor's housing, while the Hall element is located between the two vertical sections and adjacent to the PCB board. The magnetic field generated by the current passing through the horizontal section is concentrated by the magnetic core. The Hall element senses the magnetic field generated by the current passing through the horizontal section at the air gap of the magnetic core. Through electromagnetism-electromagnetism conversion, the Hall current sensor can measure the magnitude of the current passing through the copper busbar.

[0005] However, in the case of a large current flowing through the copper busbar, see... Figure 1The magnetic fields M4' and M5' generated by the current through the two vertical sections of the copper busbar (especially the parts of each vertical section close to the PCB board) will interfere with the magnetic field M1' induced by the Hall element at the air gap 220' of the magnetic core 22'. This causes the signal output by the Hall element to deviate, resulting in a significant reduction in the current detection accuracy of the Hall current sensor, or even rendering the Hall current sensor unusable. Utility Model Content

[0006] The purpose of this disclosure is to provide a conductor and a printed circuit board assembly that at least partially solves the above-mentioned problems.

[0007] In a first aspect of this disclosure, a conductor is provided, adapted to be fixed on a PCB board and through which the magnitude of current passing by a Hall current sensor is measured. The conductor includes: a first segment adapted to pass through an inner hole of a housing of a Hall current sensor; a second segment extending from a first end of the first segment and adapted to be connected to a first location on the PCB board; and a third segment extending from a second end of the first segment and adapted to be connected to a second location on the PCB board, wherein at least one of the second and third segments has a bent structure, the bent structure extending bently from the first segment toward one side of the first segment in a plane perpendicular to the first segment.

[0008] In some embodiments, the bent structure is C-shaped or L-shaped.

[0009] In some embodiments, the bent structure includes: a first horizontal segment, the first end of which is connected to a first segment; a vertical segment, the first end of which is connected to a second end of the first horizontal segment; and a second horizontal segment, which is disposed opposite to the first horizontal segment, and the first end of the second horizontal segment is connected to the second end of the vertical segment, the second end of the second horizontal segment being provided with a first connecting portion for connecting to a PCB board.

[0010] In some embodiments, when the conductor passes through the inner hole of the Hall current sensor and is fixed to the PCB board, the vertical section does not exceed the adjacent side of the Hall current sensor.

[0011] In some embodiments, the second segment has a bent structure; the third segment is perpendicular to the first segment and is provided with a second connecting part, which is used to connect with the PCB board, and the first connecting part and the second connecting part are opposite to each other.

[0012] In some embodiments, when the conductor is inserted into the inner hole of the Hall current sensor and the conductor is fixed on the PCB board, the second segment is adjacent to the first end face of the housing of the Hall current sensor, the third segment is adjacent to the second end face of the housing of the Hall current sensor opposite to the first end face, and the distance between the second segment and the first end face is less than the distance between the third segment and the second end face.

[0013] In some embodiments, the Hall current sensor includes a magnetic core and a Hall element located inside the housing. The magnetic core has an air gap, the Hall element is located in the air gap, and when a conductor is inserted into the inner hole of the Hall current sensor and the conductor is fixed to the PCB board, the Hall element is located between the first connection portion and the second connection portion.

[0014] In some embodiments, the conductor is a copper busbar.

[0015] In a second aspect of this disclosure, a printed circuit board assembly is provided. The printed circuit board assembly includes a PCB board, a Hall current sensor, and a conductor according to a first aspect of this disclosure, wherein both the Hall current sensor and the conductor are fixed to the PCB board, the housing of the Hall current sensor has an inner hole, a first segment of the conductor passes through the inner hole of the Hall current sensor, and the Hall current sensor is used to measure the magnitude of the current passing through the conductor.

[0016] In embodiments according to this disclosure, by designing at least one of the second and third segments of the conductor for connection with the PCB board as a bent structure, the interference of the magnetic field generated by the current through the second and / or third segments on the magnetic field at the air gap of the Hall current sensor core can be reduced, thereby improving the sampling accuracy and measurement accuracy of the Hall current sensor.

[0017] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0018] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0019] Figure 1 A schematic diagram showing the magnetic field of two vertical segments of a copper busbar in the prior art, and the magnetic field at the air gap of the magnetic core of a Hall current sensor;

[0020] Figure 2 A three-dimensional structural schematic diagram of a conductor element according to some embodiments of the present disclosure is shown;

[0021] Figure 3 It shows Figure 2 Side view of the conductor shown;

[0022] Figure 4 and Figure 5 It shows Figure 2 The diagram shows structural schematics of the conductor and Hall current sensor in combination from different perspectives; and

[0023] Figure 6 It shows when current passes through Figure 4 and Figure 5 The diagram shows the magnetic field at the air gap of the Hall current sensor's magnetic core, as well as the magnetic fields at the vertical section of the second segment and the third segment of the conductor. Detailed Implementation

[0024] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0025] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0026] As described above, a conventional copper busbar fixed to a PCB board typically has an inverted U-shaped structure, consisting of a horizontal section and two vertical sections extending perpendicularly from both ends of the horizontal section. The ends of the two vertical sections furthest from the horizontal section are connected to the PCB board, and the horizontal section passes through the inner hole of the housing of a Hall current sensor fixed to the PCB board. The Hall element of the Hall current sensor is located between the two vertical sections and adjacent to the PCB board. The magnetic field generated by the current passing through the horizontal section is concentrated by the magnetic core, and the Hall element senses the magnetic field generated by the current passing through the horizontal section at the air gap of the magnetic core, enabling the Hall current sensor to measure the magnitude of the current passing through the copper busbar. However, when a large current passes through the copper busbar, the magnetic field generated by the current passing through the two vertical sections of the copper busbar (especially the parts of each vertical section close to the PCB board) can interfere with the magnetic field sensed by the Hall element at the air gap of the Hall current sensor's magnetic core. This causes a deviation in the signal output by the Hall element, resulting in a significant reduction in the current detection accuracy of the Hall current sensor, or even rendering the Hall current sensor unusable.

[0027] To at least partially solve the above-mentioned problems, embodiments of this disclosure provide a conductor 10 and a printed circuit board assembly. By improving the structure of the conductor 10, the interference of the magnetic field generated by the current passing through the conductor 10, such as a copper busbar, on the magnetic field M1 at the air gap 220 of the magnetic core 22 of the Hall current sensor 20 can be reduced, thereby improving the current detection accuracy of the Hall current sensor 20 when a large current passes through the conductor. In the following, [further details will be provided]. Figures 2 to 6 The principles of this disclosure are described.

[0028] Figure 2 A three-dimensional structural schematic diagram of the conductor 10 according to some embodiments of the present disclosure is shown. Figure 3 It shows Figure 2 Side view of conductor 10 shown. Figure 4 and Figure 5 It shows Figure 2 The diagram shows the structure of the conductor 10 and the Hall current sensor 20 in combination from different perspectives. The two ends of the conductor 10 can be fixed to a PCB board (not shown) by soldering, for example, and the current passing through it is measured by the Hall current sensor 20, which is also fixed to the PCB board. The conductor 10 can be, but is not limited to, a copper busbar.

[0029] like Figure 2 and Figure 3 As shown, the conductor 10 includes a first segment 11, a second segment 12, and a third segment 13. The first segment 11 of the conductor 10 is straight and adapted to pass through the inner hole 210 of the housing 21 of the Hall current sensor 20, which measures the magnitude of the current passing through the conductor 10. The structure of the Hall current sensor 20 is described below. The second segment 12 extends from a first end of the first segment 11, and a first connecting portion 1221 is provided at the end of the second segment 12 away from the first segment 11. The third segment 13 extends from a second end of the first segment 11, and a second connecting portion 132 is provided at the end of the third segment 13 away from the first segment 11. The first connecting portion 1221 and the second connecting portion 132 can be fixedly connected to different locations on the PCB board, for example, by soldering.

[0030] At least one of the second segment 12 and the third segment 13 has a bent structure that extends from the first segment 11 toward one side of the first segment 11 in a bent manner on a plane perpendicular to the first segment 11. This bent structure can have any form, as long as it can reduce the magnetic field M1 at the air gap 220 of the magnetic core 22 of the Hall current sensor 20 (see [link to documentation]). Figure 6 Interference can be eliminated.

[0031] In some embodiments, the bent structure can be, but is not limited to, C-shaped or L-shaped. A C-shaped or L-shaped bent structure includes, for example, a horizontal section parallel to the PCB board and perpendicular to the first segment 11, and a vertical section perpendicular to the PCB board, wherein the vertical section is far from the air gap 220 of the magnetic core 22 of the Hall current sensor 20. Thus, when current passes through the bent structure, the magnetic field generated around the horizontal section is perpendicular to the magnetic field M1 at the air gap 220, and therefore does not interfere with the magnetic field at the air gap 220. Although the magnetic field generated around the vertical section is not perpendicular to the magnetic field M1 at the air gap 220, it is far from the air gap 220, and therefore hardly interferes with the magnetic field M1 at the air gap 220. Therefore, the electromagnetic interference of the conductor 10 to the Hall current sensor 20 can be reduced, especially improving the sampling accuracy and current detection accuracy of the Hall current sensor 20 under high current conditions.

[0032] See Figure 4 and Figure 5 This illustrates an exemplary embodiment of a Hall current sensor 20. The Hall current sensor 20 includes a housing 21 and a Hall element (not shown), a magnetic core 22, and circuitry (not shown) located inside the housing 21. (Refer to reference...) Figure 6 The magnetic core 22 has an open toroidal structure, with an air gap 220 formed between its two ends, and the Hall element is located in the air gap 220. The circuit includes a compensation winding wound on the magnetic core 22 and a signal processing circuit on a circuit board (not shown) disposed inside the housing 21.

[0033] The housing 21 is generally cuboid in shape, including a first end face 201 and a second end face 202 facing each other, a top side face 205 and a bottom side face (not labeled) facing each other, and side faces 203 and 204 facing each other. The top side face 205, the bottom side face, the side face 203, and the side face 204 are located between the first end face 201 and the second end face 202. In some embodiments, the side faces 203, 204, the first end face 201, and the second end face 202 are generally perpendicular to the PCB board. The Hall current sensor 20 is fixed to the PCB board via the bottom side face, and the air gap 220 of the magnetic core 22 and the Hall element are close to the bottom side face of the housing 21. The Hall current sensor 20 can also be referred to as an onboard Hall current sensor. The housing 21 is provided with an inner hole 210 penetrating the first end face 201 and the second end face 202. The inner hole 210 corresponds to the inner hole of the magnetic core 22.

[0034] The first segment 11 of the conductor 10 passes through the inner hole 210 of the housing 21. The second segment 12 is adjacent to the first end face 201 of the Hall current sensor 20, and the third segment 13 is adjacent to the second end face 202 of the Hall current sensor 20, which is opposite to the first end face 201. The conductor 10 is connected to a first position on the PCB board via a first connecting part 1221 and to a second position on the PCB board via a second connecting part 132. The current through the conductor 10 is measured by the Hall current sensor 20.

[0035] Specifically, the magnetic field generated by the current passing through the first segment 11 is concentrated in the magnetic core 22 of the Hall current sensor 20 and sensed by the Hall element located in the air gap 220. After detecting the magnetic field generated by the current passing through the first segment 11, the Hall element outputs a signal. This signal is amplified by the signal processing circuit and drives the compensation winding to generate a magnetic field of equal magnitude but opposite direction to the magnetic field generated by the current passing through the first segment 11, thereby canceling the magnetic field generated by the current passing through the first segment 11 and placing the Hall element in a zero-flux state. During this compensation process, current flows through the compensation winding, and the current flowing through the compensation winding is linearly related to the current flowing through the first segment 11. Thus, by detecting the voltage or current signal output by the compensation winding, the magnitude of the current passing through the first segment 11 (i.e., the current flowing through the conductor 10) can be accurately measured.

[0036] Figures 2 to 5 An exemplary embodiment of the conductor 10 is shown, wherein an exemplary embodiment of the bent structure is shown.

[0037] Specifically, the second segment 12 of the conductor 10 has a bent structure, more specifically a C-shaped (or inverse C-shaped when viewed from different angles) bent structure. The C-shaped bent structure includes a first horizontal segment 121, a second horizontal segment 122, and a vertical segment 123. The first end of the first horizontal segment 121 is connected to the first end of the first segment 11, and the second end extends toward the side 203 of the housing 21. The first horizontal segment 121 is, for example, parallel to the PCB board and perpendicular to the first segment 11. The first end of the vertical segment 123 is connected to the second end of the first horizontal segment 121, and the second end of the vertical segment 123 extends toward the PCB board. The vertical segment 123 is, for example, perpendicular to the PCB board. The second horizontal segment 122 is disposed opposite to the first horizontal segment 121. The second horizontal segment 122 is, for example, parallel to the first horizontal segment 121 and the PCB board, and close to the PCB board. The first end of the second horizontal segment 122 is connected to the second end of the vertical segment 123, and the second end of the second horizontal segment 122 extends toward the side 204. The first connecting part 1221 is provided at the second end of the second horizontal segment 122.

[0038] The third segment 13 of the conductor 10 is straight and extends from the second end of the first segment 11 toward the PCB board. The third segment 13 can be perpendicular to the first segment 11 and the PCB board. The third segment 13 adopts a non-bending structure, which is conducive to the conductor 10 passing through the inner hole 210 of the housing 21.

[0039] In some embodiments, the first connecting portion 1221 and the second connecting portion 132 are opposite to each other. More specifically, the first connecting portion 1221 and the second connecting portion 132 are arranged at a distance from each other in a direction parallel to the first segment 11, and the Hall element of the Hall current sensor 20 is located between the first connecting portion 1221 and the second connecting portion 132. In this way, the conductor 10 can be adapted to a PCB board that mates with a conventional inverted U-shaped copper busbar, which helps to save costs.

[0040] Figure 6 It shows when current passes through Figure 3 and Figure 4 The diagram shows the magnetic field M1 at the air gap 220 of the magnetic core 22 of the Hall current sensor, as well as the magnetic field at the vertical section 123 of the second section 12 and the magnetic field at the third section 13 of the conductor 10.

[0041] Reference Figures 4 to 6 When current flows through conductor 10 along the direction of the third segment 13, the first segment 11, and the second segment 12, the magnetic field generated by the current through the first segment 11 is concentrated in the magnetic core 22 of the Hall current sensor. The portion of this magnetic field at the air gap 220 is labeled as magnetic field M1, and the Hall element senses magnetic field M1. The magnetic field generated by the current through the first horizontal segment 121 (not shown in the figure) is not only perpendicular to magnetic field M1, but also away from magnetic field M1 in a direction perpendicular to the PCB board, thus it does not interfere with magnetic field M1. The magnetic field generated by the current through the second horizontal segment 122 (not shown in the figure) is perpendicular to magnetic field M1 and also does not interfere with magnetic field M1. Although the magnetic field M3 generated by the current through the vertical segment 123 is not perpendicular to magnetic field M1, magnetic field M3 is away from air gap 220 and will hardly interfere with magnetic field M1 at air gap 220. Thus, the interference of the magnetic field generated by the current through the second segment 12 on magnetic field M1 can be reduced, thereby improving the sampling accuracy of Hall current sensor 20.

[0042] Continue to refer to Figure 4 and Figure 6Since the vertical segment 123 of the second segment 12 is far from the air gap 220, the magnetic field generated by the current through the second segment 12 hardly interferes with the magnetic field M1. In some embodiments, the distance between the second segment 12 and the first end face 201 can be smaller than the distance between the third segment 13 and the second end face 202. That is, without increasing the dimension of the conductor 10 in the extension direction of the first segment 11, the distance between the third segment 13 and the air gap 220 is maximized. In this way, the magnetic field M2 generated by the current through the third segment 13, being far from the air gap 220, will hardly interfere with the magnetic field M1 at the air gap 220, further improving the sampling accuracy of the Hall current sensor 20.

[0043] See Figure 4 and Figure 5 In some embodiments, the vertical segment 123 does not extend beyond the adjacent side 203 of the Hall current sensor 20 to optimize the structure. In some embodiments, the vertical segment 123 is flush with the side 203, for example.

[0044] The exemplary embodiments of conductor 10 have been described above. Of course, in some alternative embodiments, the implementation of conductor 10 can have various variations and is not limited to the description above. For example, in some embodiments, the third segment 13 can also be a bent structure without affecting the installation of conductor 10 and Hall sensor 20. In some embodiments, the bent structure of the third segment 13 and the bent structure of the second segment 12 can be symmetrical or asymmetrical. In some embodiments, the bent structures of the second segment 12 and / or the third segment 13 can be L-shaped. Taking the L-shaped bent structure of the second segment 12 as an example, the second end 12 may include... Figure 2 The first horizontal segment 121 and the vertical segment 123 are omitted, and the second horizontal segment 122 is omitted. At this time, the first connecting part 1221 is provided at the end of the vertical segment 123 away from the first horizontal segment 121.

[0045] According to embodiments of this disclosure, a printed circuit board assembly is also provided, which includes a PCB board, a Hall current sensor 20, and a conductor 10. Both the Hall current sensor 20 and the conductor 10 are fixed to the PCB board. The implementation of the Hall current sensor 20 and the conductor 10 can be referred to the description above, and will not be repeated here.

[0046] In the embodiments according to this disclosure, by designing the structure of the conductor 10, under strict dimensional requirements, the magnetic field generated by the current through the conductor 10 can hardly interfere with the magnetic field M1 at the air gap 220 of the magnetic core 22 of the Hall current sensor 20, effectively avoiding electromagnetic interference between the primary side and the secondary side output. Experimental verification shows that, under high current conditions (e.g., current below 500A), the printed circuit board assembly using the conductor 10 of this disclosure can effectively follow the primary side current (current through the conductor 10) under high current conditions, and the measurement error of the Hall current sensor 20 is within an acceptable range.

[0047] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A conductor (10) adapted to be fixed on a PCB board and through which the magnitude of the current is measured by a Hall current sensor (20), characterized in that, The conductor (10) includes: The first segment (11) is adapted to be inserted into the inner hole (210) of the housing (21) of the Hall current sensor (20); The second segment (12) extends from the first end of the first segment (11) and is adapted to connect to a first position on the PCB board; and The third segment (13) extends from the second end of the first segment (11) and is adapted to connect to a second position on the PCB board, and At least one of the second segment (12) and the third segment (13) is a bent structure that extends from the first segment (11) toward one side of the first segment (11) in a bent manner on a plane perpendicular to the first segment (11).

2. The conductor (10) according to claim 1, characterized in that, The bent structure is C-shaped or L-shaped.

3. The conductor (10) according to claim 1, characterized in that, The bent structure includes: The first horizontal segment (121) has its first end connected to the first segment (11); The vertical segment (123) has its first end connected to the second end of the first horizontal segment (121); and The second horizontal segment (122) is disposed opposite to the first horizontal segment (121), and the first end of the second horizontal segment (122) is connected to the second end of the vertical segment (123). The second end of the second horizontal segment (122) is provided with a first connecting part (1221), which is used to connect with the PCB board.

4. The conductor (10) according to claim 3, characterized in that, When the conductor (10) passes through the inner hole (210) of the Hall current sensor (20) and the conductor (10) is fixed on the PCB board, the vertical segment (123) does not exceed the adjacent side (203) of the Hall current sensor (20).

5. The conductor (10) according to claim 3 or 4, characterized in that, The second segment (12) has the aforementioned bent structure; The third segment (13) is perpendicular to the first segment (11), and the third segment (13) is provided with a second connecting part (132), which is used to connect with the PCB board. The first connecting part (1221) and the second connecting part (132) are opposite to each other.

6. The conductor (10) according to claim 5, characterized in that, When the conductor (10) passes through the inner hole (210) of the Hall current sensor (20) and the conductor (10) is fixed on the PCB board, the second segment (12) is adjacent to the first end face (201) of the housing (21) of the Hall current sensor (20), and the third segment (13) is adjacent to the second end face (202) of the housing (21) of the Hall current sensor (20) opposite to the first end face (201). The distance between the second segment (12) and the first end face (201) is less than the distance between the third segment (13) and the second end face (202).

7. The conductor (10) according to claim 5, characterized in that, The Hall current sensor (20) includes a magnetic core (22) and a Hall element located inside the housing (21), the magnetic core (22) having an air gap (220), and the Hall element located within the air gap (220). When the conductor (10) passes through the inner hole (210) of the Hall current sensor (20) and the conductor (10) is fixed on the PCB board, the Hall element is located between the first connection part (1221) and the second connection part (132).

8. The conductor (10) according to claim 1, characterized in that, The conductor (10) is a copper busbar.

9. A printed circuit board assembly, characterized in that, It includes a PCB board, a Hall current sensor (20), and a conductor (10) as described in any one of claims 1 to 8. The Hall current sensor (20) and the conductor (10) are both fixed on the PCB board. The housing (21) of the Hall current sensor (20) has an inner hole (210). The first segment (11) of the conductor (10) passes through the inner hole (210) of the Hall current sensor (20). The Hall current sensor (20) is used to measure the magnitude of the current passing through the conductor (10).

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