Current sensing module

Abstract

A current sensing module is disclosed. The current sensing module includes a circuit board, a ring-shaped magnetic body, and a current sensing component. The circuit board has at least one copper foil laid therein. The ring-shaped magnetic body has an inner side surface, an outer side surface, a first end surface, and a second end surface. The ring-shaped magnetic body has a gap between the first end surface and the second end surface, and the gap has a predetermined width. The gap forms a copper foil exclusion zone around a location of the circuit board. The current sensing component is coupled to the circuit board and disposed in the gap. A vertical projection area of an outer exclusion zone of the copper foil exclusion zone on the circuit board is outside a vertical projection area of the ring-shaped magnetic body on the circuit board. The vertical projection area of the outer exclusion zone on the circuit board does not overlap the vertical projection area of the ring-shaped magnetic body on the circuit board.

Description

Technical Field

[0001] This invention relates to a current sensing module, and more particularly to a current sensing module having a copper foil forbidden zone. Background Technology

[0002] Currently, when using current sensors, such as Hall effect current sensors, on a circuit board, to protect the Hall effect current sensor from electromagnetic interference, copper is typically not laid underneath the location of the Hall effect current sensor, or no other components are placed there. However, the area on the circuit board without copper cannot be used for circuit layout; in other words, the usable area on the circuit board for circuit layout is reduced.

[0003] Therefore, how to overcome the above-mentioned defects by improving the structural design so that the current sensor can be free from electromagnetic interference without reducing the usable area on the circuit board for circuit layout has become one of the important issues to be solved in this field. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a current sensing module that addresses the shortcomings of the prior art.

[0005] To address the aforementioned technical problems, one technical solution adopted by the present invention is to provide a current sensing module, comprising a circuit board, a ring-shaped magnetic body, and a current sensing component. The circuit board includes multiple stacked layers, with at least one copper foil laid between the layers. The ring-shaped magnetic body is disposed on the circuit board and has an inner surface, an outer surface, a first end face, and a second end face. The first end face faces the second end face and is connected between the inner and outer surfaces. The second end face is connected between the inner and outer surfaces. An air gap with a predetermined width is formed between the first and second end faces, and a copper foil containment area is formed around the air gap at its location on the circuit board to prevent copper foil from being laid therein. The current sensing component is coupled to the circuit board and disposed in the air gap. The copper foil containment area includes an outer containment area. The vertical projection area of ​​the outer containment area on the circuit board is located outside the vertical projection area of ​​the ring-shaped magnetic body on the circuit board, and the vertical projection area of ​​the outer containment area on the circuit board does not overlap with the vertical projection area of ​​the ring-shaped magnetic body on the circuit board.

[0006] Preferably, the annular magnetic body defines a first corner point at the connection between its outer surface and the first end face, and defines a second corner point at the connection between its outer surface and the second end face; wherein, the copper foil forbidden area is composed of a first side line, a second side line, a third side line, and a fourth side line, the first side line is parallel to the first end face and is a predetermined width away from the first corner point, the second side line is parallel to the second end face and is a predetermined width away from the second corner point, and the first corner point and the second corner point are located between the first side line and the second side line, the third side line and the fourth side line are connected between the first side line and the second side line, and the third side line and the fourth side line are parallel to each other and perpendicular to the first side line and the second side line.

[0007] Preferably, the annular magnetic body defines a first corner point at the connection between its outer surface and the first end face, and defines a second corner point at the connection between its outer surface and the second end face; wherein, the copper foil forbidden area is composed of a first side line, a second side line, a third side line, and a fourth side line, the first side line is parallel to the first end face and is a predetermined width away from the first corner point, the second side line is parallel to the second end face and is a predetermined width away from the second corner point, and the first corner point and the second corner point are located between the first side line and the second side line, the third side line and the fourth side line are connected between the first side line and the second side line, and the third side line and the fourth side line are parallel to each other and perpendicular to the first side line and the second side line.

[0008] Preferably, the area of ​​the outer restriction zone is equal to the area of ​​a rectangle formed by three times the predetermined width multiplied by one time the predetermined width.

[0009] Preferably, the copper foil containment area further includes an intermediate containment area and an inner containment area. The intermediate containment area is connected between the outer containment area and the inner containment area. The area of ​​the intermediate containment area is equal to three times the vertical projection area of ​​the air gap on the circuit board. The inner containment area and the outer containment area are symmetrically arranged and have equal areas.

[0010] Preferably, the lengths of the first, second, third, and fourth sidelines are equal to three times the predetermined width.

[0011] Preferably, the vertical projection area of ​​the annular magnetic body on the circuit board partially overlaps with the area of ​​at least one copper foil laid on the circuit board.

[0012] Preferably, the circuit board has a circuit wiring structure, the current sensing component is electrically connected to the circuit wiring structure, and the circuit wiring structure is distributed in the air gap from the position of the first end face on the circuit board to the position of the second end face on the circuit board, or from the position of the second end face on the circuit board to the position of the first end face on the circuit board.

[0013] Preferably, the circuit board has a circuit wiring structure, the current sensing component is electrically connected to the circuit wiring structure, and the circuit wiring structure is distributed in the air gap from the position of the first end face on the circuit board to the position of the second end face on the circuit board, or from the position of the second end face on the circuit board to the position of the first end face on the circuit board.

[0014] Preferably, a first corner point is defined at the junction of the outer surface and the first end face of the annular magnetic body, and a second corner point is defined at the junction of the outer surface and the second end face of the annular magnetic body; wherein, the outer restriction area is composed of a first side line, a second side line, a third side line and a fourth side line, the first side line is parallel to the first end face and is a predetermined width away from the first corner point, the second side line is parallel to the second end face and is a predetermined width away from the second corner point, and the first corner point and the second corner point are located between the first side line and the second side line, the third side line and the fourth side line are connected between the second side line and the third side line, and the third side line is an arc line formed along the outer surface of the annular magnetic body, and the fourth side line is perpendicular to the second side line and the third side line.

[0015] Preferably, the area of ​​the outer restriction zone is larger than the area of ​​the rectangle formed by three times the predetermined width multiplied by one time the predetermined width.

[0016] Preferably, the lengths of the first and second sidelines are between one and two times the predetermined width, and the length of the fourth sideline is equal to three times the predetermined width.

[0017] One of the beneficial effects of the present invention is that the current sensing module provided by the present invention can, through the technical solutions of "the current sensing component is set in the air gap, the air gap forms a copper foil restraint area at the circuit board position and its surroundings to prevent copper foil from being laid therein" and "the copper foil restraint area includes an outer restraint area, the vertical projection area of ​​the outer restraint area on the circuit board is located outside the vertical projection area of ​​the annular magnetic body on the circuit board, and the vertical projection area of ​​the outer restraint area on the circuit board does not overlap with the vertical projection area of ​​the annular magnetic body on the circuit board", the copper foil is not laid only at the air gap position where the current sensing component is located and its surroundings, which greatly reduces the area of ​​the copper foil restraint area, that is, increases the usable area on the circuit board for circuit layout.

[0018] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the current sensing module of the present invention.

[0020] Figure 2 This is an exploded view of the current sensing module of the present invention.

[0021] Figure 3 This is an exploded view of the circuit board of the current sensing module of the present invention.

[0022] Figure 4 This is a three-dimensional schematic diagram of the current sensing module and the copper pillar of the present invention.

[0023] Figure 5 This is a schematic diagram of the magnetic field lines of the current sensing module of the present invention.

[0024] Figure 6 This is a first schematic diagram of the copper foil forbidden zone of the current sensing module of the present invention.

[0025] Figure 7 This is a second schematic diagram of the copper foil forbidden zone of the current sensing module of the present invention. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of the "current sensing module" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated beforehand. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention.

[0027] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components, these components should not be limited by these terms. These terms are primarily used to distinguish one component from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more related listed items.

[0028] Example

[0029] First, refer to Figure 1, Figure 2 as well as Figure 3 As shown, Figure 1 This is a three-dimensional schematic diagram of the current sensing module of the present invention. Figure 2 This is an exploded view of the current sensing module of the present invention. Figure 3 This is an exploded view of the circuit board of the current sensing module of the present invention. An embodiment of the present invention provides a current sensing module M, which includes: a circuit board 1, a ring-shaped magnetic body 2, and a current sensing component 3. The circuit board in the present invention can be a multi-layer printed circuit board (PCB), that is, the circuit board 1 includes multiple stacked layers 11, and at least one copper foil 12 is laid between the multiple layers 11, such as... Figure 3 As shown. However, it should be noted that, Figure 3 The circuit board 1 shown is for illustrative purposes only. The present invention is not limited to the number, size, or position of the copper foil 12 in the circuit board 1, nor is it limited to the number and size of the multiple layers 11, as will be stated above.

[0030] Continue reading Figure 1 and Figure 2 As shown, a ring-shaped magnetic body 2 is disposed on the circuit board 1. The ring-shaped magnetic body 2 can be a C-shaped magnetic ring, having an inner surface 21, an outer surface 22, a first end face 23, and a second end face 24. The first end face 23 and the second end face 24 are disposed opposite to each other and face each other. The first end face 23 connects the inner surface 21 and the outer surface 22, and the second end face 24 connects the inner surface 21 and the outer surface 22. An air gap G is provided between the first end face 23 and the second end face 24. The air gap G has a predetermined width g, specifically, the distance between the first end face 23 and the second end face 24. The air gap G forms a copper foil forbidden area T at the location of the circuit board 1 and its periphery, preventing copper foil from being laid within the copper foil forbidden area T. A current sensing component 3 is coupled to the circuit board 1 through multiple contacts 31 and disposed in the air gap G, that is, between the first end face 23 and the second end face 24, to sense the magnitude of the current value. Furthermore, the current sensing component 3 is separate from the annular magnetic body 2. Additionally, for example, the current sensing component 3 may be a Hall current sensor, and the annular magnetic body 2 may be made of a magnetically conductive material, silicon steel, or iron oxide; however, the invention is not limited thereto.

[0031] See Figure 4 and Figure 5 As shown, Figure 4 This is a three-dimensional schematic diagram of the current sensing module and the copper pillar of the present invention. Figure 5This is a schematic diagram of the magnetic field lines of the current sensing module of the present invention. When a copper pillar 4 is inserted into the annular magnetic body 2, the copper pillar 4 can conduct current, causing the annular magnetic body 2 to generate electromagnetic induction and form multiple magnetic field lines between the first end face 23 and the second end face 24. The direction of the multiple magnetic field lines is generally horizontal, such as... Figure 5 As shown, Figure 5 The arrow-shaped directional lines represent multiple magnetic field lines. Additionally, it should be noted that... Figure 5 The arrows pointing in the diagram are for illustrative purposes only. The actual direction of the magnetic field lines can be determined based on the direction of current conduction in the copper pillar 4, and this invention is not limited thereto. Furthermore, the circuit board 1 has a circuit wiring structure 13, and the current sensing component 3 is electrically connected to the circuit wiring structure 13 through multiple contacts 31. The circuit wiring structure 13 is distributed in the air gap G in a direction from the position of the first end face 23 on the circuit board 1 to the position of the second end face 24 on the circuit board 1, or from the position of the second end face 24 on the circuit board 1 to the position of the first end face 23 on the circuit board 1, that is, it is generally horizontal. Therefore, the direction of the multiple magnetic field lines will be parallel to the direction of the circuit wiring structure 13 distributed in the air gap G.

[0032] Next, refer to Figure 6 As shown, Figure 6 This is a first schematic diagram of the copper foil forbidden region of the current sensing module of the present invention. From another perspective, Figure 6 This can be considered a schematic diagram of the copper foil forbidden region T and the annular magnetic body 2 projected onto the circuit board 1. The copper foil forbidden region T includes an outer forbidden region T1. The vertical projection area of ​​the outer forbidden region T1 on the circuit board 1 is located outside the vertical projection area of ​​the annular magnetic body 2 on the circuit board 1, and the vertical projection areas of the outer forbidden region T1 and the annular magnetic body 2 on the circuit board 1 do not overlap. Furthermore, it should be noted that, for ease of explanation and clarity, in... Figure 6 And the following Figure 7 The current sensing component 3 was omitted in all of them.

[0033] Continuing from the above, the annular magnetic body 2 defines a first corner point 25 at the junction of its outer surface 22 and the first end face 23, and a second corner point 26 at the junction of its outer surface 22 and the second end face 24. The annular magnetic body 2 defines a third corner point 27 at the junction of its inner surface 21 and the first end face 23, and a fourth corner point 28 at the junction of its inner surface 21 and the second end face 24. Figure 6As shown, the area covered by the copper foil containment zone T is essentially a square, surrounded by a first edge L1, a second edge L2, a third edge L3, and a fourth edge L4. The lengths of the first edge L1, the second edge L2, the third edge L3, and the fourth edge L4 are equal to three times the predetermined width g. The position of the first edge L1 is one predetermined width g to the left of the first corner point 25 (or the first end face 23). The position of the second edge L2 is one predetermined width g to the right of the second corner point 26 (or the second end face 24). The position of the third edge L3 is one predetermined width g downward from the third corner point 27 (or the fourth corner point 28). The position of the fourth edge L4 is one predetermined width g upward from the first corner point 25 (or the second corner point 26). Therefore, the first edge line L1 is parallel to the first end face 23 and is a predetermined width g away from the first corner point 25. The second edge line L2 is parallel to the second end face 24 and is a predetermined width g away from the second corner point 26. The first corner point 25 and the second corner point 26 are located between the first edge line L1 and the second edge line L2. The third edge line L3 and the fourth edge line L4 are connected between the first edge line L1 and the second edge line L2. The third edge line L3 and the fourth edge line L4 are parallel to each other and perpendicular to the first edge line L1 and the second edge line L2.

[0034] Continue reading Figure 6 As shown, the copper foil restricted area T includes an outer restricted area T1, a middle restricted area T2, and an inner restricted area T3. The middle restricted area T2 connects the inner restricted area T3 and the outer restricted area T1. The outer restricted area T1 and the middle restricted area T2 are separated by a fifth boundary line L5, and the inner restricted area T3 and the middle restricted area T2 are separated by a sixth boundary line L6. Specifically, the outer restricted area T1 is surrounded by the first boundary line L1, the second boundary line L2, the fourth boundary line L4, and the fifth boundary line L5; the middle restricted area T2 is surrounded by the first boundary line L1, the second boundary line L2, the fourth boundary line L4, and the fifth boundary line L5; and the inner restricted area T3 is surrounded by the first boundary line L1, the second boundary line L2, the third boundary line L3, and the sixth boundary line L6. The outer restricted area T1, the middle restricted area T2, and the inner restricted area T3 are all rectangular in shape. The areas of the outer restriction zone T1 and the inner restriction zone T3 are equal to the area formed by three times the predetermined width g multiplied by one predetermined width g. The vertical projection areas of the intermediate restriction zone T2 and the inner restriction zone T3 on the circuit board 1 partially overlap with the vertical projection area of ​​the annular magnetic body 2 on the circuit board 1. Furthermore, the area of ​​the intermediate restriction zone T2 is equal to three times the vertical projection area of ​​the air gap G on the circuit board 1, and the inner restriction zone T3 is symmetrically arranged with equal areas to the outer restriction zone T1.

[0035] This invention establishes a copper foil forbidden zone T on the circuit board 1. In terms of design, copper foil is only excluded from the area encompassed by the copper foil forbidden zone T; other areas can be covered with copper foil. In actual simulations, when the copper pillar 4 conducts current and induces electromagnetic induction in the annular magnetic body 2, the region with the highest magnetic flux density of the annular magnetic body 2 is located at the air gap G (i.e., the location of the current sensing component 3), particularly on the outer side of the air gap G. Therefore, by establishing a copper foil forbidden zone T at the location of the air gap G on the circuit board 1 and around that location, this invention covers the region with the highest magnetic flux density, preventing electromagnetic interference caused by the copper foil in that region. All areas on the circuit board 1 except for the copper foil forbidden zone T can be covered with copper foil. In other words, the vertical projection area of ​​the annular magnetic body 2 on the circuit board 1 partially overlaps with the area where copper foil is laid on the circuit board 1. Therefore, compared to the prior art where no copper foil is laid on the position of the annular magnetic body 2 on the circuit board, the current sensing module M provided by the present invention has a copper foil area laid on the circuit board 1 that is much larger than the copper foil area laid on the circuit board 1 in the prior art. In other words, the current sensing module M provided by the present invention greatly increases the area of ​​the circuit board 1 that can be used for circuit layout.

[0036] See Figure 7 As shown, Figure 7This is a second schematic diagram of the copper foil forbidden region of the current sensing module of the present invention, illustrating another embodiment of the copper foil forbidden region T. As mentioned above, since the region with the highest magnetic flux density of the annular magnetic body 2 is located outside the air gap G, the copper foil forbidden region T can be set only for this region. Specifically, the annular magnetic body 2 defines a first corner point 25 at the connection between its outer surface 22 and the first end face 23, and a second corner point 26 at the connection between its outer surface 22 and the second end face 24. The outer forbidden region T1 is surrounded by a first side line L1, a second side line L2, a third side line L3, and a fourth side line L4. The first edge line L1 is located at a predetermined width g, shifted to the left by a distance equal to one corner point 25 (or the first end face 23). The second edge line L2 is located at a predetermined width g, shifted to the right by a distance equal to one corner point 26 (or the second end face 24). The third edge line L3 is an arc formed along the outer surface 22 of the annular magnetic body 2. The fourth edge line L4 is located at a predetermined width g, shifted upward by a distance equal to one corner point 25 (or the second corner point 26). Therefore, the first edge line L1 is parallel to the first end face 23 and is a predetermined width g away from the first corner point 25. The second edge line L2 is parallel to the second end face 24 and is a predetermined width g away from the second corner point 26. The first corner point 25 and the second corner point 26 are located between the first edge line L1 and the second edge line L2. The third edge line L3 and the fourth edge line L4 connect the second edge line L2 and the third edge line L3, and the fourth edge line L4 is perpendicular to the second edge line L2 and the third edge line L3. The lengths of the first sideline L1 and the second sideline L2 are between one and two times the predetermined width g, and the length of the fourth sideline L4 is equal to three times the predetermined width g. Therefore, Figure 7 The area of ​​the outer restricted zone T1 shown is slightly larger than that of the outer restricted zone T1 shown. Figure 6 The area of ​​the outer restricted zone T1 is shown. Therefore, Figure 7 The area of ​​the outer restricted area T1 shown is greater than the area of ​​the rectangle formed by three times the predetermined width g multiplied by one time the predetermined width g.

[0037] Beneficial effects of the embodiments

[0038] One of the beneficial effects of the present invention is that the current sensing module M provided by the present invention can, through the technical solutions of "the current sensing component 3 is set in the air gap G, the air gap G forms a copper foil forbidden area T at the position of the circuit board 1 and its surrounding area to prevent copper foil from being laid therein" and "the copper foil forbidden area T includes an outer forbidden area T1, the vertical projection area of ​​the outer forbidden area T1 on the circuit board 1 is located outside the vertical projection area of ​​the annular magnetic body 2 on the circuit board 1, and the vertical projection area of ​​the outer forbidden area T1 on the circuit board 1 does not overlap with the vertical projection area of ​​the annular magnetic body 2 on the circuit board 1", the copper foil is not laid at the position of the air gap G where the current sensing component 3 is located and its surrounding area, which greatly reduces the area of ​​the copper foil forbidden area T, that is, increases the usable area of ​​the circuit board 1 for circuit layout.

[0039] Furthermore, in actual simulations, when the copper pillar 4 conducts current and induces electromagnetic induction in the annular magnetic body 2, the region with the highest magnetic flux density of the annular magnetic body 2 is located at the air gap G (i.e., the location of the current sensing component 3). Specifically, on the outer side of the air gap G, magnetic field lines radiate from the notches in the annular magnetic body 2 (first end face 23 and second end face 24) and couple with the copper foil of the circuit board 1. This causes the electromagnetic field generated by the annular magnetic body 2 to be affected by the copper foil of the circuit board 1. That is, a portion of the magnetic flux that should have passed entirely through the current sensing component 3 is instead transmitted to the copper foil of the circuit board 1, affecting the accuracy of the current sensing component 3. Therefore, this invention provides a copper foil exclusion zone T at the location of the air gap G on the circuit board 1 and around that location, covering the region with the highest magnetic flux density, thus preventing this region from being affected by electromagnetic interference caused by the copper foil.

[0040] Furthermore, in the current sensing module M provided by this invention, copper foil can be laid on all areas of the circuit board 1 except for the copper foil forbidden area T. That is, the vertical projection area of ​​the annular magnetic body 2 on the circuit board 1 partially overlaps with the area where copper foil is laid on the circuit board 1. Therefore, compared to the prior art where copper foil is not laid at any location of the annular magnetic body 2 on the circuit board, the current sensing module M provided by this invention has a much larger copper foil area on the circuit board 1 than the prior art. In other words, the current sensing module M provided by this invention significantly increases the area of ​​the circuit board 1 available for circuit layout.

[0041] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of protection of the claims of the present invention. Therefore, all equivalent technical changes made based on the content of the present invention specification and drawings are included within the scope of protection of the claims of the present invention.

Claims

1. A current sensing module, characterized in that, The current sensing module includes: A circuit board comprising a plurality of stacked layers, wherein at least one copper foil is disposed between the plurality of said layers; A ring-shaped magnetic body is disposed on the circuit board. The ring-shaped magnetic body has an inner surface, an outer surface, a first end face, and a second end face. The first end face faces the second end face and is connected between the inner surface and the outer surface. The second end face is connected between the inner surface and the outer surface. An air gap with a predetermined width is formed between the first end face and the second end face. The air gap forms a copper foil containment area at a location on the circuit board and around the perimeter of that location to prevent at least one copper foil from being laid therein. A current sensing component is coupled to the circuit board and disposed in the air gap; The copper foil containment area includes an outer containment area. The vertical projection area of ​​the outer containment area on the circuit board is located outside the vertical projection area of ​​the annular magnetic body on the circuit board, and the vertical projection area of ​​the outer containment area on the circuit board and the vertical projection area of ​​the annular magnetic body on the circuit board do not overlap with each other.

2. The current sensing module according to claim 1, characterized in that, The annular magnetic body defines a first corner point at the connection between its outer surface and the first end face, and a second corner point at the connection between its outer surface and the second end face; wherein, the copper foil forbidden area is composed of a first side line, a second side line, a third side line, and a fourth side line, the first side line is parallel to the first end face and is a predetermined width away from the first corner point, the second side line is parallel to the second end face and is a predetermined width away from the second corner point, and the first corner point and the second corner point are located between the first side line and the second side line, the third side line and the fourth side line are connected between the first side line and the second side line, and the third side line and the fourth side line are parallel to each other and perpendicular to the first side line and the second side line.

3. The current sensing module according to claim 2, characterized in that, The area of ​​the outer restricted zone is equal to the area of ​​a rectangle formed by three times the predetermined width multiplied by one time the predetermined width.

4. The current sensing module according to claim 3, characterized in that, The copper foil containment area also includes an intermediate containment area and an inner containment area. The intermediate containment area is connected between the outer containment area and the inner containment area. The area of ​​the intermediate containment area is equal to three times the vertical projection area of ​​the air gap on the circuit board. The inner containment area and the outer containment area are symmetrically arranged and have equal areas.

5. The current sensing module according to claim 2, characterized in that, The lengths of the first sideline, the second sideline, the third sideline, and the fourth sideline are equal to three times the predetermined width.

6. The current sensing module according to claim 1, characterized in that, The vertical projection area of ​​the annular magnetic body on the circuit board partially overlaps with the area where at least one copper foil is laid on the circuit board.

7. The current sensing module according to claim 1, characterized in that, The circuit board has a circuit wiring structure, and the current sensing component is electrically connected to the circuit wiring structure. The circuit wiring structure is distributed in the air gap from the position of the first end face on the circuit board to the position of the second end face on the circuit board, or from the position of the second end face on the circuit board to the position of the first end face on the circuit board.

8. The current sensing module according to claim 1, characterized in that, The annular magnetic body defines a first corner point at the connection between its outer surface and the first end face, and a second corner point at the connection between its outer surface and the second end face; wherein, the outer restriction zone is composed of a first side line, a second side line, a third side line, and a fourth side line, the first side line is parallel to the first end face and is a predetermined width away from the first corner point, the second side line is parallel to the second end face and is a predetermined width away from the second corner point, and the first corner point and the second corner point are located between the first side line and the second side line, the third side line and the fourth side line connect the second side line and the third side line, and the third side line is an arc formed along the outer surface of the annular magnetic body, and the fourth side line is perpendicular to the second side line and the third side line.

9. The current sensing module according to claim 8, characterized in that, The area of ​​the outer restricted zone is greater than the area of ​​a rectangle formed by three times the predetermined width multiplied by one time the predetermined width.

10. The current sensing module according to claim 9, characterized in that, The lengths of the first and second sidelines are between one and two times the predetermined width, and the length of the fourth sideline is equal to three times the predetermined width.

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