CN115704834A - Current sensing module - Google Patents

Abstract

The invention discloses a current sensing module. The current sensing module comprises a circuit board, an annular magnetic body and a current sensing assembly. At least one copper foil is laid in the circuit board. The annular magnetic body has an inner side surface, an outer side surface, a first end surface and a second end surface. An air gap is arranged between the first end face and the second end face, and the air gap has a preset width. The air gap forms a copper foil forbidden zone at the periphery of the position of the circuit board. The current sensing assembly is coupled to the circuit board and disposed in the air gap. The vertical projection area of the outer forbidden area of the copper foil forbidden area on the circuit board is positioned outside the vertical projection area of the annular magnetic body on the circuit board. The vertical projection area of the outer forbidden zone on the circuit board is not overlapped with the vertical projection area of the annular magnetic body on the circuit board.

Description

Current sensing module

Technical Field

The present invention relates to a current sensing module, and more particularly, to a current sensing module having a copper foil forbidden region.

Background

At present, when a current sensor, such as a hall current sensing component, is disposed on a circuit board, in order to protect the hall current sensing component from electromagnetic interference, copper is generally not laid or other components are not disposed below the position where the hall current sensing component is disposed on the circuit board. However, the area of the circuit board not covered with copper is not suitable for circuit layout (layout), i.e. the area available for circuit layout on the circuit board is reduced.

Therefore, how to overcome the above-mentioned drawbacks by improving the structure design so that the current sensor can not be interfered by electromagnetic interference and the available area on the circuit board as a circuit layout can not be reduced has become one of the important issues to be solved in this field.

Disclosure of Invention

The present invention provides a current sensing module for overcoming the drawbacks of the prior art.

In order to solve the above technical problems, one technical solution of the present invention is to provide a current sensing module, which includes a circuit board, an annular magnetic body, and a current sensing assembly. The circuit board comprises a plurality of laminated plates which are stacked, and at least one copper foil is laid among the laminated plates. The annular magnetic body is arranged on the circuit board and is provided with an inner side surface, an outer side surface, a first end surface and a second end surface, the first end surface faces the second end surface, the first end surface is connected between the inner side surface and the outer side surface, the second end surface is connected between the inner side surface and the outer side surface, an air gap is arranged between the first end surface and the second end surface, the air gap has a preset width, and a copper foil forbidden zone is formed on the periphery of the position of the circuit board of the air gap to prevent copper foil from being laid in the air gap. The current sensing assembly is coupled to the circuit board and disposed in the air gap. The copper foil forbidden zone comprises an outer forbidden zone, the vertical projection area of the outer forbidden zone on the circuit board is positioned outside the vertical projection area of the annular magnetic body on the circuit board, and the vertical projection area of the outer forbidden zone on the circuit board is not overlapped with the vertical projection area of the annular magnetic body on the circuit board.

Preferably, the annular magnetic body defines a first angular point at a joint of the outer side surface and the first end surface, and the annular magnetic body defines a second angular point at a joint of the outer side surface and the second end surface; the copper foil forbidden zone is formed by surrounding a first edge line, a second edge line, a third edge line and a fourth edge line, wherein the first edge line is parallel to the first end face and is away from the first corner point by one time of the preset width, the second edge line is parallel to the second end face and is away from the second corner point by one time of the preset width, the first corner point and the second corner point are located between the first edge line and the second edge line, the third edge line and the fourth edge line are connected between the first edge line and the second edge line, the third edge line and the fourth edge line are parallel to each other, and the third edge line and the fourth edge line are perpendicular to the first edge line and the second edge line.

Preferably, a first angular point is defined at the joint of the outer side surface and the first end surface of the annular magnetic body, and a second angular point is defined at the joint of the outer side surface and the second end surface of the annular magnetic body; the copper foil forbidden zone is formed by a first side line, a second side line, a third side line and a fourth side line in a surrounding mode, the first side line is parallel to the first end face and is separated from the first corner point by a double preset width, the second side line is parallel to the second end face and is separated from the second corner point by a double preset width, 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, the third side line and the fourth side line are parallel to each other, and the third side line and the fourth side line are perpendicular to the first side line and the second side line.

Preferably, the area of the outer exclusion zone is equal to the rectangular area formed by multiplying three times the predetermined width by one time the predetermined width.

Preferably, the copper foil forbidden zone further comprises a middle forbidden zone and an inner forbidden zone, the middle forbidden zone is connected between the outer forbidden zone and the inner forbidden zone, the area of the middle forbidden zone is three times of the vertical projection area of the air gap on the circuit board, and the inner forbidden zone and the outer forbidden zone are symmetrically arranged and have the same area.

Preferably, the length of the first, second, third and fourth edge is equal to three times the predetermined width.

Preferably, the perpendicular projection area of the annular magnetic body on the circuit board partially overlaps the area of at least one copper foil laid on the circuit board.

Preferably, the circuit board has a circuit wiring structure, the current sensing element 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.

Preferably, the circuit board has a circuit wiring structure, the current sensing element 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.

Preferably, a first angular point is defined at the joint of the outer side surface and the first end surface of the annular magnetic body, and a second angular point is defined at the joint of the outer side surface and the second end surface of the annular magnetic body; the outer forbidden zone is formed by surrounding 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 separated from the first corner point by a double preset width, the second side line is parallel to the second end face and is separated from the second corner point by a double preset width, 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, the third side line is an arc line formed along the outer side surface of the annular magnetic body, and the fourth side line is perpendicular to the second side line and the third side line.

Preferably, the area of the outer exclusion zone is greater than the rectangular area formed by multiplying three times the predetermined width by one time the predetermined width.

Preferably, the length of the first side line and the second side line is between one time of the predetermined width and two times of the predetermined width, and the length of the fourth side line is equal to three times of the predetermined width.

One of the benefits of the present invention is that the current sensing module provided by the present invention can be disposed in the air gap through the "current sensing component, the air gap forms a copper foil forbidden region at the position of the circuit board and the periphery thereof to prevent the copper foil from being laid therein", and the "copper foil forbidden region includes an outer forbidden region, the vertical projection region of the outer forbidden region on the circuit board is located outside the vertical projection region of the annular magnetic body on the circuit board, and the vertical projection region of the outer forbidden region on the circuit board is not overlapped with the vertical projection region of the annular magnetic body on the circuit board", only the copper foil is not laid at the position of the air gap where the current sensing component is located and the periphery thereof, so as to greatly reduce the area of the copper foil forbidden region, that is, to improve the available area on the circuit board as the circuit layout.

For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.

Drawings

Fig. 1 is a perspective view of a current sensing module according to the present invention.

FIG. 2 is an exploded view of the current sensing module of the present invention.

Fig. 3 is an exploded view of a circuit board of the current sensing module of the present invention.

Fig. 4 is a schematic perspective view of a current sensing module and a copper pillar according to the present invention.

Fig. 5 is a schematic diagram of the magnetic line of the current sensing module of the present invention.

Fig. 6 is a first schematic view of a copper foil forbidden zone of a current sensing module according to the present invention.

Fig. 7 is a second schematic diagram of a copper foil forbidden region of the current sensing module of the invention.

Detailed Description

The following is a description of the embodiments of the "current sensing module" disclosed in the present application with reference to specific embodiments, and those skilled in the art will understand the advantages and effects of the present invention from the disclosure of the present application. The invention is capable of other and different embodiments and its several details are capable of modification and various other changes, which can be made in various details within the specification and without departing from the spirit and scope of the invention. The drawings of the present invention are for illustrative purposes only and are not intended to be drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used primarily to distinguish one element from another. In addition, the term "or" as used herein should be taken to include any one or combination of more of the associated listed items as the case may be.

Examples

First, referring to fig. 1, 2 and 3, fig. 1 is a perspective view of a current sensing module of the present invention, fig. 2 is an exploded view of the current sensing module of the present invention, and fig. 3 is an exploded view of a 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, an annular magnetic body 2 and a current sensing component 3. The circuit board of the present invention may be a Printed Circuit Board (PCB) with a multi-layer structure, that is, the circuit board 1 includes a plurality of stacked layers 11, and at least one copper foil 12 is disposed between the plurality of layers 11, as shown in fig. 3. It should be noted, however, that the circuit board 1 shown in fig. 3 is only for illustrative purposes, and the number, size and position of the copper foil 12 in the circuit board 1 are not limited in the present invention, and the number and size of the plurality of laminated boards 11 are not limited in the present invention.

With reference to fig. 1 and fig. 2, the annular magnetic body 2 is disposed on the circuit board 1, and the annular magnetic body 2 may be a C-shaped magnetic ring having an inner surface 21, an outer surface 22, a first end surface 23 and a second end surface 24. The first end surface 23 and the second end surface 24 are disposed opposite to each other and face each other, the first end surface 23 is connected between the inner side surface 21 and the outer side surface 22, and the second end surface 24 is connected between the inner side surface 21 and the outer side surface 22. An Air Gap (Air Gap) G is provided between the first end surface 23 and the second end surface 24. The air gap G has a predetermined width G, specifically, the predetermined width G is a distance between the first end surface 23 and the second end surface 24. The air gap G forms a copper foil forbidden zone T at the position and periphery of the circuit board 1, and within the range of the copper foil forbidden zone T, the copper foil is prevented from being laid therein. The current sensing element 3 is coupled to the circuit board 1 through a plurality of contacts 31 and disposed in the air gap G, i.e., between the first end surface 23 and the second end surface 24, to induce a current value. In addition, the current sensing assembly 3 is separated from the annular magnetic body 2. For example, the Current sensing element 3 may be a Hall Current sensing element (Hall Current Sensor), and the material of the annular magnetic body 2 may be a magnetic conductive material, silicon steel or iron oxide, but the invention is not limited thereto.

Referring to fig. 4 and 5, fig. 4 is a schematic perspective view of the current sensing module and the copper pillar of the present invention, and fig. 5 is a schematic view of a magnetic line of force of the current sensing module of the present invention. When a copper pillar 4 penetrates through the annular magnetic body 2, the copper pillar 4 can be used to conduct current, so that the annular magnetic body 2 generates electromagnetic induction to form a plurality of magnetic lines of force between the first end surface 23 and the second end surface 24, and the plurality of magnetic lines of force have a substantially horizontal direction, as shown in fig. 5, the direction line with an arrow in fig. 5 represents the plurality of magnetic lines of force. It should be noted that the arrow directions of the magnetic lines in fig. 5 are only used for illustration, and the directions of the magnetic lines can be actually determined according to the conduction direction of the current in the copper pillar 4, and the invention is not limited thereto. Further, the circuit board 1 has a circuit layout structure 13, and the current sensing element 3 is electrically connected to the circuit layout structure 13 through a plurality of contacts 31. The circuit wiring structures 13 are distributed in the air gap G from the position of the first end surface 23 on the circuit board 1 to the position of the second end surface 24 on the circuit board 1, or from the position of the second end surface 24 on the circuit board 1 to the position of the first end surface 23 on the circuit board 1, i.e. they run substantially horizontally. Therefore, the magnetic lines of force run parallel to the direction of the circuit wiring structure 13 distributed in the air gap G.

Next, referring to fig. 6, fig. 6 is a first schematic view of a copper foil forbidden region of the current sensing module of the invention. On the other hand, fig. 6 can be seen as a schematic diagram of the copper foil forbidden zone T and the annular magnetic body 2 projected on the circuit board 1. The copper foil forbidden zone T comprises an outer forbidden zone T1, the vertical projection area of the outer forbidden zone T1 on the circuit board 1 is positioned 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 zone T1 on the circuit board 1 and the vertical projection area of the annular magnetic body 2 on the circuit board 1 are not overlapped with each other. Note that, for convenience of description and clarity of illustration, the current sensing element 3 is omitted in fig. 6 and fig. 7 described later.

In light of the above, the annular magnetic body 2 further defines a first corner point 25 at a connection between the outer surface 22 and the first end surface 23, and the annular magnetic body 2 defines a second corner point 26 at a connection between the outer surface 22 and the second end surface 24. The annular magnetic body 2 defines a third corner 27 at the junction of the inner surface 21 and the first end surface 23, and the annular magnetic body 2 defines a fourth corner 28 at the junction of the inner surface 21 and the second end surface 24. As shown in fig. 6, the area covered by the copper foil forbidden zone T is substantially a square, and 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 lengths of the first edge line L1 and the second edge line L2, the third edge line L3 and the fourth edge line L4 are equal to three times of the predetermined width g, the position of the first edge line L1 is shifted to the left by the first corner point 25 (or the first end surface 23) by one time of the predetermined width g, the position of the second edge line L2 is shifted to the right by the second corner point 26 (or the second end surface 24) by one time of the predetermined width g, the position of the third edge line L3 is shifted to the down by the third corner point 27 (or the fourth corner point 28) by one time of the predetermined width g, and the position of the fourth edge line L4 is shifted to the up by the first corner point 25 (or the second corner point 26) by one time of the predetermined width g. Therefore, the first edge line L1 is parallel to the first end surface 23 and has a distance of one time of the predetermined width g from the first corner point 25, the second edge line L2 is parallel to the second end surface 24 and has a distance of one time of the predetermined width g 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 the third edge line L3 and the fourth edge line L4 are perpendicular to the first edge line L1 and the second edge line L2.

As shown in fig. 6, the copper foil forbidden zone T includes an intermediate forbidden zone T2 and an inner forbidden zone T3 in addition to the outer forbidden zone T1. The middle forbidden zone T2 is connected between the inner forbidden zone T3 and the outer forbidden zone T1, the outer forbidden zone T1 and the middle forbidden zone T2 can be separated by a fifth edge line L5, and the inner forbidden zone T3 and the middle forbidden zone T2 can be separated by a sixth edge line L6. Specifically, the outer forbidden zone T1 is surrounded by a first sideline L1, a second sideline L2, a fourth sideline L4 and a fifth sideline L5, the middle forbidden zone T2 is surrounded by the first sideline L1, the second sideline L2, the fourth sideline L4 and the fifth sideline L5, and the inner forbidden zone T3 is surrounded by the first sideline L1, the second sideline L2, the third sideline L3 and the sixth sideline L6. The outer confinement region T1, the middle confinement region T2 and the inner confinement region T3 are all rectangular in shape. The areas of the outer and inner forbidden zones T1 and T3 are equal to an area formed by multiplying three times the predetermined width g by one time the predetermined width g. The vertical projection area of the middle forbidden zone T2 on the circuit board 1 and the vertical projection area of the inner forbidden zone T3 on the circuit board 1 are partially overlapped with the vertical projection area of the annular magnetic body 2 on the circuit board 1. Further, the area of the middle forbidden zone T2 is three times as large as the vertical projection area of the air gap G on the circuit board 1, and the inner forbidden zone T3 and the outer forbidden zone T1 are symmetrically arranged and have the same area.

In the invention, the copper foil forbidden zone T is arranged on the circuit board 1, so that the copper foil is not laid in the range contained in the copper foil forbidden zone T in design, and the copper foil can be laid in other areas. Since in the practical simulation, when the copper pillar 4 conducts the current to generate the electromagnetic induction of the annular magnetic body 2, the region of the annular magnetic body 2 where the magnetic flux density is highest is located at the position of the air gap G (i.e. the position of the current sensing assembly 3), especially outside the air gap G. Therefore, the invention covers the area with the highest magnetic flux density by arranging the copper foil forbidden zone T at the position of the air gap G on the circuit board 1 and at the periphery of the position, so that the area can not be subjected to electromagnetic interference caused by the copper foil. The circuit board 1 can be laid with copper foil in the area except the copper foil forbidden area T, that is, the perpendicular projection area of the annular magnetic body 2 on the circuit board 1 is partially overlapped with the area where the copper foil is laid on the circuit board 1. Therefore, compared to the prior art that no copper foil is laid at any position of the annular magnetic body 2 on the circuit board, the area of the copper foil laid on the circuit board 1 of the current sensing module M provided by the present invention is much larger than that of the copper foil laid on the circuit board 1 of the prior art, in other words, the area of the circuit board 1 for circuit layout is greatly increased by the current sensing module M provided by the present invention.

Referring to fig. 7, fig. 7 is a second schematic view of a copper foil forbidden zone of a current sensing module according to another embodiment of the present invention. As mentioned above, since the region of the ring-shaped magnetic body 2 where the magnetic flux density is highest is located outside the air gap G, the copper foil forbidden region T may be provided only for this region. Specifically, the annular magnetic body 2 defines a first corner point 25 at a connection position of the outer surface 22 and the first end surface 23, and the annular magnetic body 2 defines a second corner point 26 at a connection position of the outer surface 22 and the second end surface 24. The outer forbidden zone T1 is surrounded by a first sideline L1, a second sideline L2, a third sideline L3 and a fourth sideline L4. The first side line L1 is a position shifted from the first corner point 25 (or the first end surface 23) to the left by a distance twice as large as the predetermined width g, the second side line L2 is a position shifted from the second corner point 26 (or the second end surface 24) to the right by a distance twice as large as the predetermined width g, the third side line L3 is a circular arc line formed along the outer side surface 22 of the annular magnetic body 2, and the fourth side line L4 is a position shifted from the first corner point 25 (or the second corner point 26) to the up by a distance twice as large as the predetermined width g. Therefore, the first edge line L1 is parallel to the first end surface 23 and has a distance of one time of the predetermined width g from the first corner point 25, the second edge line L2 is parallel to the second end surface 24 and has a distance of one time of the predetermined width g 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 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 border line L1 and the second border line L2 are between one time of the predetermined width g and two times of the predetermined width g, and the length of the fourth border line L4 is equal to three times of the predetermined width g. Therefore, the area of the outer forbidden zone T1 shown in fig. 7 is slightly larger than that of the outer forbidden zone T1 shown in fig. 6. Therefore, the area of the outer exclusion zone T1 shown in fig. 7 is larger than the rectangular area formed by multiplying three times the predetermined width g by one time the predetermined width g.

Advantageous effects of the embodiments

One of the benefits of the present invention is that the current sensing module M provided by the present invention can be disposed in the air gap G through the "current sensing component 3, the air gap G forms a copper foil forbidden zone T at the position of the circuit board 1 and the periphery thereof to prevent the copper foil from being laid therein", and the "copper foil forbidden zone T includes an outer forbidden zone T1, the vertical projection area of the outer forbidden zone 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 zone T1 on the circuit board 1 and the vertical projection area of the annular magnetic body 2 on the circuit board 1 do not overlap", and only the copper foil is not laid at the position of the air gap G where the current sensing component 3 is located and the periphery thereof, so as to greatly reduce the area of the copper foil forbidden zone T, that is, to improve the available area on the circuit board 1 as the circuit layout.

Further, in the practical simulation, when the copper pillar 4 conducts the current to cause the annular magnetic body 2 to generate the electromagnetic induction, the region of the annular magnetic body 2 with the highest magnetic flux density is located at the position of the air gap G (i.e. the position of the current sensing component 3), especially outside the air gap G, the magnetic lines of force are radiated from the gap (the first end surface 23 and the second end surface 24) of the annular magnetic body 2 and coupled with the copper foil of the circuit board 1, so that the electromagnetic field generated by the annular magnetic body 2 is affected by the copper foil of the circuit board 1, that is, the magnetic flux that should pass through the current sensing component 3 completely becomes a part of the magnetic flux to be transmitted to the copper foil of the circuit board 1, and the accuracy of the current sensing component 3 is affected. Therefore, the invention covers the area with the highest magnetic flux density by arranging the copper foil forbidden zone T at the position of the air gap G on the circuit board 1 and at the periphery of the position, so that the area can not be subjected to electromagnetic interference caused by the copper foil.

Furthermore, in the current sensing module M provided by the present invention, the circuit board 1 may be laid with copper foil in areas other than the copper foil forbidden area T. That is, the perpendicular projection area of the annular magnetic body 2 on the circuit board 1 partially overlaps the area where the copper foil is laid on the circuit board 1. Therefore, compared to the prior art that no copper foil is laid at any position of the annular magnetic body 2 on the circuit board, the area of the copper foil laid on the circuit board 1 of the current sensing module M provided by the present invention is much larger than that of the copper foil laid on the circuit board 1 of the prior art, in other words, the area of the circuit board 1 for circuit layout is greatly increased by the current sensing module M provided by the present invention.

The disclosure is only a preferred embodiment of the invention, and is not intended to limit the scope of the claims, so that all technical equivalents and modifications using the contents of the specification and drawings are included in the scope of the claims.

Claims (11)

1. A current sensing module, wherein the current sensing module comprises:

the circuit board comprises a plurality of stacked laminates, and at least one copper foil is laid between the laminates;

an annular magnetic body disposed on the circuit board, the annular magnetic body having an inner side surface, an outer side surface, a first end surface and a second end surface, the first end surface facing the second end surface, the first end surface connected between the inner side surface and the outer side surface, the second end surface connected between the inner side surface and the outer side surface, an air gap having a predetermined width between the first end surface and the second end surface, the air gap forming a copper foil exclusion zone at a position of the circuit board and a periphery of the position to prevent the at least one copper foil from being laid therein; and

a current sensing assembly coupled to the circuit board and disposed in the air gap;

the copper foil forbidden zone comprises an outer forbidden zone, a vertical projection area of the outer forbidden zone on the circuit board is positioned outside a vertical projection area of the annular magnetic body on the circuit board, and the vertical projection area of the outer forbidden zone on the circuit board and the vertical projection area of the annular magnetic body on the circuit board are not overlapped.

2. The current sensing module of claim 1, wherein the annular magnetic body defines a first corner point at a junction of the outer side surface and the first end surface, and the annular magnetic body defines a second corner point at a junction of the outer side surface and the second end surface; the copper foil forbidden zone is formed by surrounding a first edge line, a second edge line, a third edge line and a fourth edge line, wherein the first edge line is parallel to the first end face and is away from the first corner point by one time of the preset width, the second edge line is parallel to the second end face and is away from the second corner point by one time of the preset width, the first corner point and the second corner point are located between the first edge line and the second edge line, the third edge line and the fourth edge line are connected between the first edge line and the second edge line, the third edge line and the fourth edge line are parallel to each other, and the third edge line and the fourth edge line are perpendicular to the first edge line and the second edge line.

3. The current sensing module of claim 2, wherein the outer keep-out zone has an area equal to an area of a rectangle formed by three times the predetermined width times one time the predetermined width.

4. The current sensing module of claim 3, wherein the copper foil forbidden zone further comprises an intermediate forbidden zone and an inner forbidden zone, the intermediate forbidden zone is connected between the outer forbidden zone and the inner forbidden zone, the area of the intermediate forbidden zone is three times the area of the perpendicular projection of the air gap on the circuit board, and the inner forbidden zone and the outer forbidden zone are symmetrically arranged and have the same area.

5. The current sensing module of claim 2, wherein the lengths of the first, second, third, and fourth edges are equal to three times the predetermined width.

6. The current sensing module of claim 1, wherein a perpendicular projected area of the annular magnetic body on the circuit board partially overlaps an area where the at least one copper foil is laid on the circuit board.

7. The current sensing module of claim 1, wherein the circuit board has a circuit wiring structure, the current sensing element 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.

8. The current sensing module of claim 1, wherein the circuit board has a circuit wiring structure, the current sensing element 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.

9. The current sensing module of claim 1, wherein the annular magnetic body defines a first corner point at a junction of the outer side surface and the first end surface, and a second corner point at a junction of the outer side surface and the second end surface; the outer forbidden zone is formed by surrounding 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 separated from the first corner point by one time of the preset width, the second side line is parallel to the second end face and is separated from the second corner point by one time of the preset width, 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, the third side line is an arc line formed along the outer side surface of the annular magnetic body, and the fourth side line is perpendicular to the second side line and the third side line.

10. The current sensing module of claim 9, wherein the outer keep-out zone has an area greater than an area of a rectangle formed by three times the predetermined width times one time the predetermined width.

11. The current sensing module of claim 9, wherein the length of the first and second edges is between one and two times the predetermined width, and the length of the fourth edge is equal to three times the predetermined width.

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