Differential and common mode composite iron core assembly and filter

Abstract

The utility model relates to the technical field of filters, in particular to a differential and common mode composite iron core assembly and a filter. The utility model provides a differential-mode and common-mode composite iron core assembly, which comprises a protection box, a differential-mode magnetic assembly and a common-mode magnetic assembly, an installation cavity is arranged in the protection box, the protection box is provided with a threading hole mechanism for a coil to pass through, and the differential-mode magnetic assembly and the common-mode magnetic assembly are installed in the installation cavity of the protection box; the common-mode magnetic assembly comprises a common-mode iron core, the common-mode iron core is a closed iron core, and the closed common-mode iron core forms a hollow cavity penetrating through the thickness direction of the closed common-mode iron core in the first direction; the differential mode magnetic assembly comprises a differential mode iron core. According to the differential and common mode composite iron core assembly, the composite design of the differential mode magnetic assembly and the common mode magnetic assembly is realized, so that the space is saved, the size of the filter is smaller, and the waste of the space is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, and particularly relates to a differential-common mode composite iron core assembly and a filter. Background Art

[0002] A filter is a frequency-selective device that can allow specific frequency components in a signal to pass through while greatly attenuating other frequency components. By utilizing this frequency-selective function of the filter, interference noise can be filtered out or spectrum analysis can be performed. In other words, any device or system that can allow specific frequency components in a signal to pass through while greatly attenuating or suppressing other frequency components is called a filter.

[0003] In traditional filter designs, it is a common design method to separate the differential-mode magnetic component and the common-mode magnetic component into two independent parts. However, installing the differential-mode magnetic component and the common-mode magnetic component separately in two protective boxes requires more space to meet the design, which increases the volume of the filter and causes waste of space. Summary of the Utility Model

[0004] (1) The problem to be solved by the utility model is that in traditional filter designs, installing the differential-mode magnetic component and the common-mode magnetic component separately in two protective boxes requires more space to meet the design, which increases the volume of the filter and causes waste of space.

[0005] (2) Technical Solution

[0006] A differential-common mode composite iron core assembly includes a protective box, a differential-mode magnetic component, and a common-mode magnetic component. The protective box has an installation cavity, and the protective box is provided with a wire passing hole mechanism for allowing a coil to pass through. The differential-mode magnetic component and the common-mode magnetic component are installed in the installation cavity of the protective box;

[0007] The common-mode magnetic component includes a common-mode iron core, and the common-mode iron core is a closed iron core. The closed common-mode iron core forms a hollow cavity penetrating through its thickness direction along a first direction;

[0008] The differential-mode magnetic component includes a differential-mode iron core. The differential-mode iron core is disposed in the hollow cavity of the common-mode iron core, and the differential-mode iron core penetrates through the hollow cavity along the first direction;

[0009] The differential-mode iron core has a first end face and a second end face that are arranged in a second direction and are parallel to each other. The second direction is perpendicular to the first direction. Both the first end face and the second end face face the inner wall of the hollow cavity, and the distance between the first end face and the second end face is adjustable so that the distance between the first end face and the inner wall of the hollow cavity and the distance between the second end face and the inner wall of the hollow cavity are adjustable.

[0010] According to an embodiment of the present utility model, the common-mode iron core is a closed iron core in a loop shape.

[0011] According to an embodiment of the present utility model, the common-mode iron core is a closed iron core in a circular ring shape.

[0012] According to an embodiment of the present utility model, the differential-mode iron core includes two magnetic blocks in the shape of straight triangular prisms. The inclined surfaces of the two magnetic blocks in the shape of straight triangular prisms are spliced to form the differential-mode iron core in a rectangular block shape. The right-angled surfaces extending along the first direction on the two magnetic blocks respectively constitute the first end face and the second end face;

[0013] A gap adjusting mechanism is provided between the inclined surfaces of the two magnetic blocks. The gap adjusting mechanism is used to adjust the gap size between the inclined surfaces of the two magnetic blocks so as to adjust the distance between the first end face and the inner wall of the common-mode iron core and the distance between the second end face and the inner wall of the common-mode iron core.

[0014] According to an embodiment of the present utility model, the gap adjusting mechanism includes a silica gel block. The inclined surfaces of the two magnetic blocks are respectively bonded to the silica gel block, and the distance between the inclined surfaces of the two magnetic blocks is adjusted by adjusting the thickness of the silica gel block.

[0015] According to an embodiment of the present utility model, for a differential-common-mode composite iron core assembly as claimed in the claims, the common-mode iron core has a first side and a second side that are perpendicular to each other. The length of the first side is greater than the length of the second side. The differential-mode iron core is perpendicular to the first side and divides the hollow cavity into two winding cavities.

[0016] According to an embodiment of the present utility model, the protective box is in a rectangular box shape, and the side surface of the common-mode iron core is bonded to the inner wall of the protective box;

[0017] The wire passing hole mechanism includes two first wire passing holes and two second wire passing holes. The first wire passing holes and the second wire passing holes are both strip-shaped holes. The first wire passing holes and the second wire passing holes penetrate the top wall and the bottom wall of the protective box, and the first wire passing holes and the second wire passing holes are both perpendicular to the first side of the common-mode iron core; the two first wire passing holes are respectively located above the two winding cavities, and the two second wire passing holes are respectively located on both sides of the differential-mode iron core.

[0018] According to an embodiment of the present utility model, the protective box is in a rectangular box shape, and the wire passing hole mechanism includes third wire passing holes provided on the top wall and the bottom wall of the protective box. The third wire passing holes are circular holes, and the third wire passing holes are coaxially arranged with the common-mode iron core. A partition is connected to the inner wall of each third wire passing hole, and the partition is arranged radially along the third wire passing hole.

[0019] According to an embodiment of the present utility model, the partition is located directly above the differential-mode iron core.

[0020] A filter includes the above-mentioned differential- and common-mode composite iron core assembly.

[0021] Advantages of the present utility model:

[0022] A differential- and common-mode composite iron core assembly provided by the present utility model includes a protective box, a differential-mode magnetic assembly, and a common-mode magnetic assembly. The protective box has an installation cavity, and the protective box is provided with a wire passing hole mechanism for allowing a coil to pass through. The differential-mode magnetic assembly and the common-mode magnetic assembly are installed in the installation cavity of the protective box. The common-mode magnetic assembly includes a common-mode iron core, and the common-mode iron core is a closed iron core. The closed common-mode iron core forms a hollow cavity penetrating through its thickness direction along a first direction. The differential-mode magnetic assembly includes a differential-mode iron core, and the differential-mode iron core is disposed in the hollow cavity of the common-mode iron core, and the differential-mode iron core penetrates through the hollow cavity along the first direction. The differential-mode iron core has a first end face and a second end face that are arranged in a second direction and are parallel to each other. The second direction is perpendicular to the first direction. Both the first end face and the second end face face the inner wall of the hollow cavity, and the distance between the first end face and the second end face is adjustable so that the distance between the first end face and the inner wall of the hollow cavity and the distance between the second end face and the inner wall of the hollow cavity are adjustable.

[0023] By installing the closed common-mode iron core into the protective box, then installing the differential-mode iron core into the hollow cavity of the common-mode iron core, and then winding coils around the common-mode iron core and the differential-mode iron core respectively through the wire passing hole mechanism, a composite design of the differential-mode magnetic assembly and the common-mode magnetic assembly is achieved. Compared with the prior art in which the differential-mode magnetic assembly and the common-mode magnetic assembly are separately installed in two protective boxes, it has at least the following advantages: First, space is saved, making the volume of the filter smaller and avoiding waste of space. Second, since the distance between the differential-mode iron core and the common-mode iron core is adjustable, the differential-mode inductance can be adjusted. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram when winding a coil around the differential- and common-mode composite iron core assembly provided in Embodiment 1 of the present utility model;

[0026] Figure 2 It is a structural diagram of the differential- and common-mode composite iron core assembly provided in Embodiment 1 of the present utility model;

[0027] Figure 3 Structural diagram of the differential-common mode composite iron core assembly provided in the first embodiment of the present utility model after removing the top cover;

[0028] Figure 4 Structural diagram of the differential mode iron core provided in the first embodiment of the present utility model;

[0029] Figure 5 Structural diagram of the differential-common mode composite iron core assembly provided in the second embodiment of the present utility model;

[0030] Figure 6 Structural diagram of the differential-common mode composite iron core assembly provided in the second embodiment of the present utility model after removing the top cover.

[0031] Icon: 1. Protective box; 101. Top cover; 102. First wire passing hole; 103. Second wire passing hole; 104. Third wire passing hole; 105. Partition; 2. Common mode iron core; 3. Differential mode iron core; 301. Magnetic block; 302. Silicone block; 4. Copper bus socket. Specific embodiments

[0032] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0033] Embodiment 1:

[0034] As Figures 1 - 4 shown, the first embodiment of the present utility model provides a differential-common mode composite iron core assembly, including a protective box 1, a differential mode magnetic assembly, and a common mode magnetic assembly. The protective box 1 has an installation cavity, and the protective box 1 is provided with a wire passing hole mechanism for allowing the coil to pass through. The differential mode magnetic assembly and the common mode magnetic assembly are installed in the installation cavity of the protective box 1;

[0035] The common mode magnetic assembly includes a common mode iron core 2. The common mode iron core 2 is a closed iron core, and the closed common mode iron core 2 forms a hollow cavity penetrating through its thickness direction along the first direction;

[0036] The differential mode magnetic assembly includes a differential mode iron core 3. The differential mode iron core 3 is disposed in the hollow cavity of the common mode iron core 2, and the differential mode iron core 3 penetrates through the hollow cavity along the first direction;

[0037] The differential mode iron core 3 has a first end face and a second end face arranged along the second direction and parallel to each other. The second direction is perpendicular to the first direction. Both the first end face and the second end face face the inner wall of the hollow cavity, and the distance between the first end face and the second end face is adjustable so that the distance between the first end face and the inner wall of the hollow cavity and the distance between the second end face and the inner wall of the hollow cavity are adjustable.

[0038] In this embodiment, by installing the closed common-mode iron core 2 into the protective box 1, then installing the differential-mode iron core 3 into the hollow cavity of the common-mode iron core 2, and then winding coils around the common-mode iron core 2 and the differential-mode iron core 3 respectively through the wire-passing hole mechanism, a composite design of the differential-mode magnetic component and the common-mode magnetic component is achieved. Compared with the previous method of separately installing the differential-mode magnetic component and the common-mode magnetic component in two protective boxes 1, it has at least the following advantages: First, space is saved, making the volume of the filter smaller and avoiding waste of space. Second, since the distance between the first end face and the second end face of the differential-mode iron core 3 is adjustable, the distance between the first end face of the differential-mode iron core 3 and the inner wall of the hollow cavity and the distance between the second end face of the differential-mode iron core 3 and the inner wall of the hollow cavity are adjustable. In this way, the differential-mode inductance can be adjusted by adjusting the size of the gap between the differential-mode iron core 3 and the common-mode iron core 2, so the differential-mode inductance can be flexibly adjusted.

[0039] As a preferred embodiment, as Figure 3 and Figure 4 shown, the common-mode iron core 2 is a closed iron core in a loop shape, the protective box 1 is a rectangular box, the common-mode iron core 2 is placed on the inner bottom wall of the protective box 1, and the side surface of the common-mode iron core 2 is bonded to the inner wall of the protective box 1 through silicone rubber. The differential-mode iron core 3 is a rectangular block, which is perpendicular to the long side of the common-mode iron core 2, and the differential-mode iron core 3 is centered in the hollow cavity of the differential-mode iron core 3 to divide the hollow cavity into two winding cavities with the same volume.

[0040] The above-mentioned first direction is the thickness direction of the common-mode iron core 2, that is, the height direction of the protective box 1. The second direction is the width direction of the common-mode iron core 2, and also the width direction of the protective box 1.

[0041] Considering that the volume of the traditional rectangular-block differential-mode iron core 3 is fixed, but there are errors in the precision of the loop-shaped common-mode iron core 2 and the rectangular-block differential-mode iron core 3 during production and manufacturing. During actual installation, there will be a problem that the differential-mode iron core 3 cannot be installed into the hollow cavity of the common-mode iron core 2.

[0042] To solve this technical problem, the differential-mode iron core 3 includes two straight triangular prism-shaped magnetic blocks 301. The inclined surfaces of the two straight triangular prism-shaped magnetic blocks 301 are spliced to form a rectangular-block differential-mode iron core 3 as shown in Figure 4 shown. The above-mentioned first end face and second end face are the left and right side surfaces of the differential-mode iron core 3 in Figure 4 . The left and right side surfaces of the differential-mode iron core 3 face the inner walls where the long sides of the hollow cavity of the common-mode iron core 2 are located.

[0043] It should be noted that the lengths of the two magnetic blocks 301 are determined according to the width of the hollow cavity of the common-mode iron core 2. Specifically, the length of the magnetic block 301 is less than the width of the hollow cavity. Thus, the length of the rectangular block-shaped differential-mode iron core 3 is smaller than the width of the hollow cavity of the common-mode iron core 2, so as to ensure that even if the production precision error of the loop-shaped common-mode iron core 2 is relatively large, the rectangular block-shaped differential-mode iron core 3 composed of the two magnetic blocks 301 can be placed into the hollow cavity.

[0044] Furthermore, a silica gel block 302 is provided between the inclined surfaces of the two magnetic blocks 301. The silica gel block 302 serves to connect the two magnetic blocks 301. Moreover, the gap size between the inclined surfaces of the two magnetic blocks 301 can be adjusted by replacing the silica gel blocks 302 with different thicknesses, which plays a role in adjusting the length of the differential-mode iron core 3.

[0045] When installing the differential-mode iron core 3 in this way, first, the two magnetic blocks 301 are fitted together and placed into the hollow cavity of the common-mode iron core 2. Then, the thickness of the required silica gel block 302 is determined according to the gap size between the side surface of the differential-mode iron core 3 and the inner wall of the common-mode iron core 3. Next, a suitable silica gel block 302 is fabricated according to the gap size between the side surface of the differential-mode iron core 3 and the inner wall of the common-mode iron core 3. Then, the two magnetic blocks 301 are connected with the silica gel block 302. Finally, the fabricated differential-mode iron core 3 with the silica gel block 302 is placed into the hollow cavity of the common-mode iron core 2. This can ensure that the differential-mode iron core 3 can be placed into the hollow cavity of the common-mode iron core 2 every time it is installed.

[0046] It should be noted that after the differential-mode iron core 3 with a fixed volume is installed into the hollow cavity of the common-mode iron core 2, since the gap size between the differential-mode iron core 3 and the inner wall of the common-mode iron core 2 is fixed, it is also impossible to adjust the differential-mode inductance by adjusting the gap size between the differential-mode iron core 3 and the common-mode iron core 2.

[0047] However, for the differential-mode iron core 3 in this embodiment, since the silica gel blocks 302 with different thicknesses can be flexibly replaced, after the differential-mode iron core 3 is placed into the hollow cavity of the common-mode iron core 2, the gap size between the end faces on both sides of the differential-mode iron core 3 and the inner wall of the common-mode iron core 2 can be within a suitable range, and the gap size between the differential-mode iron core 3 and the common-mode iron core 2 can be flexibly adjusted to adjust the differential-mode inductance.

[0048] Specifically, according to the requirements of the common-mode inductance, the outer length of the common-mode iron core 3 is 40 mm, the outer width is 36 mm, the inner length is 30 mm, the inner width is 26 mm, and the height is 25 mm. According to the common-mode dimensions and the safety distance between the copper bars, the dimensions of each magnetic block 301 are designed with a height of 24.5 mm, a length of 25.6 mm, and a thickness of 4 mm.

[0049] Preferably, the differential-mode iron core 3 is made of Fe-Si material. In addition, the material of the common-mode iron core 2 and the material of the differential-mode iron core 3 can be selected as nanocrystalline and / or amorphous.

[0050] To fix the differential-mode iron core 3, the bottom surface of the magnetic block 301 in the lower position is pasted to the inner bottom wall of the protection box 1 through organic silicone.

[0051] Preferably, as Figure 2 shown, a top cover 101 is hermetically installed on the top of the protection box 1, and the wire threading hole mechanism penetrates through the top cover 101 and the inner bottom wall of the protection box 1. Specifically, the wire threading hole mechanism includes two first wire passing holes 102 and two second wire passing holes 103. The first wire passing holes 102 and the second wire passing holes 103 penetrate through the top cover 101 and the inner bottom wall of the protection box 1. The first wire passing holes 102 and the second wire passing holes 103 are both strip-shaped holes. The length directions of the first wire passing holes 102 and the second wire passing holes 103 are perpendicular to the length direction of the top cover 101. The first wire passing holes 102 and the second wire passing holes 103 are arranged in parallel. Further, the two first wire passing holes 102 are respectively located above the two winding cavities, and the two second wire passing holes 103 are respectively located on the left and right sides of the differential-mode iron core 3.

[0052] When winding the coil around the common-mode iron core 2, as Figure 1 shown, it can be wound from three different directions, that is, through the front, left, and back surfaces of the first wire passing hole 102 in Figure 1 .

[0053] When winding the coil around the differential-mode iron core 2, as Figure 1 shown, it can only pass through and out of one second wire passing hole 103, and then pass through and out of the other second wire passing hole 103, and repeat this process multiple times to wind the coil around the differential-mode iron core 2.

[0054] Preferably, the inner wall of the short side of the first wire passing hole 102 and the inner wall of the long side of the common-mode iron core 2 are located in the same vertical plane, and the inner wall of the long side of the first wire passing hole 102 is close to the inner wall of the short side of the common-mode iron core 2 along the length direction of the top cover 101. In this way, when winding the coil, the coil can be saved as much as possible, thus saving costs.

[0055] Optionally, as Figure 3 shown, two copper busbar sockets 4 are vertically installed on the inner bottom wall of the protection box 1. The copper busbar sockets 4 are used for installing copper busbars. The two copper busbar sockets 4 are symmetrically arranged with respect to the differential-mode iron core 3, and a gap is formed between each copper busbar socket 4 and the differential-mode iron core 3 for the coil to pass through.

[0056] Embodiment 2:

[0057] As Figure 5 and Figure 6 shown, Embodiment 2 of the present invention provides a differential-common mode composite iron core assembly, which is different from Embodiment 1 in that the structure of the common-mode iron core 2 is different and the wire threading hole mechanism on the protection box 1 is different.

[0058] Specifically, the common-mode iron core 2 is a circular closed iron core. The hollow cavity inside the common-mode iron core 2 is a cylindrical cavity. The common-mode iron core 2 is centrally installed inside the protective box 1, and the differential-mode iron core 3 is centrally installed inside the hollow cavity of the common-mode iron core 2 to divide the hollow cavity into two semi-cylindrical winding cavities.

[0059] Further, as Figure 5 shown, the perforating mechanism includes a third wire passing hole 104. The third wire passing hole 104 is a circular hole, and the third wire passing hole 104 penetrates through the top cover 101 of the protective box 1 and the inner bottom wall of the protective box 1. A partition plate 105 is provided on the third wire passing hole 104 of the top cover 101. The partition plate 105 is arranged along the radial direction of the third wire passing hole 104. The third wire passing hole 104 on the top cover 101 is located directly above the differential-mode iron core 3.

[0060] A partition plate 105 is also provided on the third wire passing hole 104 on the inner bottom wall of the protective box 1. The bottom edge of the differential-mode iron core 3 is bonded to the third wire passing hole 104 on the inner bottom wall of the protective box 1.

[0061] The structure of the differential-mode iron core 3 in this embodiment is exactly the same as that of the differential-mode iron core 3 in Embodiment 1, and will not be elaborated here in detail.

[0062] It should be noted that the third wire passing hole 104 is coaxially arranged with the circular common-mode iron core 2, and the diameter of the third wire passing hole 104 is the same as the inner diameter of the common-mode iron core 2.

[0063] When winding the coil around the common-mode iron core 2, the coil can be wound around the common-mode iron core 2 along the circumference of the third wire passing hole 104.

[0064] When winding the coil around the differential-mode iron core 2, it penetrates from the top of the winding cavity on the left side of the partition plate 105, then exits from the bottom of the winding cavity on the left side of the partition plate 105, then penetrates from the bottom of the winding cavity on the right side of the partition plate 105, and then exits from the top of the winding cavity on the right side of the partition plate 105, and then penetrates from the top of the winding cavity on the left side of the partition plate 105 again, and just wind several more turns like this.

[0065] Optionally, a copper row socket 4 is respectively provided in the two semi-cylindrical winding cavities on the left and right sides of the differential-mode iron core 3.

[0066] Embodiment 3:

[0067] Embodiment 3 of the present utility model provides a filter, which installs the differential-common-mode composite iron core assembly in the above Embodiment 1 or Embodiment 2. Since the differential-mode magnetic component and the common-mode magnetic component are combined and designed together, space is saved, making the volume of the filter more compact and avoiding waste of space.

[0068] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0069] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the connection inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0070] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A differential common mode composite core assembly, characterized in that: It comprises a protective box (1), a differential mode magnetic component and a common mode magnetic component, wherein the protective box (1) has a mounting cavity, the protective box (1) is provided with a threading hole mechanism for allowing a coil to pass through, and the differential mode magnetic component and the common mode magnetic component are mounted in the mounting cavity of the protective box (1); The common-mode magnetic component comprises a common-mode iron core (2), wherein the common-mode iron core (2) is a closed iron core, and the closed common-mode iron core (2) forms a hollow cavity that runs through the thickness direction thereof along a first direction; The differential mode magnetic component comprises a differential mode iron core (3), wherein the differential mode iron core (3) is arranged in the hollow cavity of the common mode iron core (2), and the differential mode iron core (3) penetrates the hollow cavity along the first direction; The differential mode core (3) has a first end face and a second end face which are arranged along a second direction and are parallel to each other, the second direction is perpendicular to the first direction, the first end face and the second end face are both facing the inner wall of the hollow cavity, and the distance between the first end face and the second end face is adjustable so that the distance between the first end face and the inner wall of the hollow cavity and the distance between the second end face and the inner wall of the hollow cavity are adjustable.

2. A differential common mode composite core assembly according to claim 1, characterized in that: The common mode iron core (2) is a closed iron core in a circular shape.

3. The differential common mode composite core assembly according to claim 1, characterized in that: The common mode iron core (2) is a circular ring-shaped closed iron core.

4. A differential common mode composite core assembly according to claim 2 or 3, characterized in that: The differential mode iron core (3) comprises two magnetic blocks (301) in the shape of straight triangular prisms, the inclined surfaces of the two magnetic blocks (301) in the shape of straight triangular prisms are spliced ​​together to form the differential mode iron core (3) in the shape of a rectangular block, and the right-angled surfaces extending along the first direction on the two magnetic blocks (301) respectively constitute the first end surface and the second end surface; A gap adjustment mechanism is provided between the inclined surfaces of the two magnetic blocks (301), and the gap adjustment mechanism is used to adjust the size of the gap between the inclined surfaces of the two magnetic blocks (301) so as to adjust the distance between the first end surface and the inner wall of the common mode core (2) and the distance between the second end surface and the inner wall of the common mode core (2).

5. A differential common mode composite core assembly according to claim 4, characterized in that: The gap adjustment mechanism comprises a silicone block (302), the inclined surfaces of the two magnetic blocks (301) are respectively bonded to the silicone block (302), and the distance between the inclined surfaces of the two magnetic blocks (301) is adjusted by adjusting the thickness of the silicone block (302).

6. The differential common mode composite core assembly according to claim 2, characterized in that: The common mode iron core (2) has a first side and a second side which are perpendicular to each other, the length of the first side is greater than the length of the second side, and the differential mode iron core (3) is perpendicular to the first side and divides the hollow cavity into two winding cavities.

7. The differential common mode composite core assembly according to claim 6, characterized in that: The protective box (1) is in the shape of a rectangular box, and the side surface of the common mode iron core (2) is bonded to the inner wall of the protective box (1); The wire threading hole mechanism comprises two first wire passing holes (102) and two second wire passing holes (103), the first wire passing holes (102) and the second wire passing holes (103) are both bar-shaped holes, the first wire passing holes (102) and the second wire passing holes (103) pass through the top wall and the bottom wall of the protective box (1), and the first wire passing holes (102) and the second wire passing holes (103) are both perpendicular to the first side of the common mode iron core (2); the two first wire passing holes (102) are respectively located above the two winding cavities, and the two second wire passing holes (103) are respectively located on both sides of the differential mode iron core (3).

8. The differential common mode composite core assembly according to claim 3, characterized in that: The protective box (1) is in the shape of a rectangular box, and the threading hole mechanism comprises a third threading hole (104) provided on the top wall and the bottom wall of the protective box (1), the third threading hole (104) is a circular hole, the third threading hole (104) is coaxially arranged with the common mode iron core (2), and a partition plate (105) is connected to the inner wall of each of the third threading holes (104), and the partition plate (105) is arranged along the radial direction of the third threading hole (104).

9. The differential common mode composite core assembly according to claim 8, characterized in that: The partition plate (105) is located directly above the differential mode core (3).

10. A filter, characterized in that: A differential common mode composite core assembly comprising any one of claims 1-9.

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