Common mode filter and electronic equipment

Abstract

The invention relates to the technical field of electronic equipment, in particular to a common-mode filter and electronic equipment, and the common-mode filter comprises a first coil which comprises a first sub-coil; the second coil comprises a second sub-coil; the third coil comprises a third sub-coil, and the first sub-coil, the second sub-coil and the third sub-coil are all spirally laid and are sequentially stacked at intervals; in the stacking direction, the second sub-coil and at least one of the first sub-coil and the third sub-coil are arranged in a staggered mode. Among a plurality of planes perpendicular to the target profile, there is a target plane that mirrors the second triangle and the first triangle with respect to the target plane. According to the common mode filter provided by the invention, the noise filtering capability can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a common mode filter and electronic equipment. Background Art

[0002] Common mode filters are widely used in various electronic devices as a signal noise filtering device. In recent years, as electronic devices have become more sophisticated and signal transmission has become faster, higher requirements have been placed on the noise filtering capabilities of common mode filters.

[0003] However, the common-mode filter in the related art usually has poor noise filtering capability, which leads to screen distortion when the common-mode filter is used in electronic devices, such as display devices. Therefore, a new common-mode filter is urgently needed to solve the above problems. Summary of the invention

[0004] The present application discloses a common mode filter and an electronic device, which can improve the noise filtering capability.

[0005] In order to achieve the above objectives, in a first aspect, the present application discloses a common mode filter, comprising:

[0006] A first coil, the first coil comprising a first sub-coil;

[0007] a second coil, the second coil comprising a second sub-coil; and,

[0008] A third coil, the third coil comprising a third sub-coil, the first sub-coil, the second sub-coil and the third sub-coil are all spirally laid and stacked in sequence;

[0009] Wherein, in the stacking direction, the second sub-coil is staggered with at least one of the first sub-coil and the third sub-coil;

[0010] In the target cross section parallel to the stacking direction, the connection lines between the centers of the Nth turn of the first sub-coil, the second sub-coil and the third sub-coil respectively from the outermost turn form a first triangle, and the connection lines between the centers of the N+1th turn of the first sub-coil, the second sub-coil and the third sub-coil respectively form a second triangle;

[0011] Among a plurality of planes perpendicular to the target cross section, there exists a target plane such that the second triangle and the first triangle are mirror images of each other with respect to the target plane.

[0012] Optionally, in the stacking direction, the first sub-coil at least partially overlaps with the third sub-coil.

[0013] Optionally, the distance between the center of the Nth turn of the first sub-coil and the center of the Nth turn of the third sub-coil is L 13 The distance between the center of the Nth turn of the first sub-coil and the center of the Nth turn of the second sub-coil is L 12 The distance between the center of the Nth turn of the second sub-coil and the center of the Nth turn of the third sub-coil is L 23 , L 13 , L 12 and L 23 Satisfies the following formula:

[0014] 0.65≤L 13 :L 12 ≤1.4, and / or, 0.65≤L 13 :L 23 ≤1.4.

[0015] Optionally, 0.85≤L 13 :L 12 ≤1.2, and / or, 0.85≤L 13 :L 23 ≤1.2.

[0016] Optionally, in a direction orthogonal to the stacking direction, a distance between the center of the Nth turn of the first sub-coil and the center of the Nth turn of the second sub-coil is D1, and a distance between the center of the Nth turn of the second sub-coil and the center of the N+1th turn of the second sub-coil is D2, and D1<D2;

[0017] and / or,

[0018] In the orthogonal direction along the stacking direction, the distance between the center of the Nth turn of the third sub-coil and the center of the Nth turn of the second sub-coil is D3, and the distance between the center of the Nth turn of the second sub-coil and the center of the N+1th turn of the second sub-coil is D2, and D3<D2.

[0019] Optionally, the first coil also includes a fourth sub-coil, the second coil also includes a fifth sub-coil, and the third coil also includes a sixth sub-coil, and the first sub-coil, the second sub-coil, the third sub-coil, the fourth sub-coil, the fifth sub-coil and the sixth sub-coil are all spirally laid and stacked in sequence, wherein the first sub-coil is electrically connected to the fourth sub-coil, the second sub-coil is electrically connected to the fifth sub-coil, and the third sub-coil is electrically connected to the sixth sub-coil.

[0020] Optionally, along the stacking direction, the distance between the first sub-coil and the second sub-coil is H1, the distance between the second sub-coil and the third sub-coil is H2, the distance between the third sub-coil and the fourth sub-coil is H3, the distance between the fourth sub-coil and the fifth sub-coil is H4, and the distance between the fifth sub-coil and the sixth sub-coil is H5, and H1, H2, H3, H4 and H5 satisfy the following formula:

[0021] 0.25≤H1: H3≤0.5; 0.25≤H2: H3≤0.5; 0.25≤H4: H3≤0.5; 0.25≤H5: H3≤0.5.

[0022] Optionally, H1+H2<H3, and / or, H4+H5<H3.

[0023] Optionally, along the stacking direction, the first sub-coil at least partially overlaps with the fourth sub-coil, the second sub-coil at least partially overlaps with the fifth sub-coil, and the third sub-coil at least partially overlaps with the sixth sub-coil.

[0024] Optionally, the common mode filter further includes:

[0025] The first sub-coil, the second sub-coil, the third sub-coil, the fourth sub-coil, the fifth sub-coil and the sixth sub-coil are all spirally laid and sequentially stacked in the non-magnetic base layer.

[0026] Optionally, the non-magnetic base layer has a first end surface and a second end surface that are arranged opposite to each other, and the common mode filter further includes:

[0027] a first magnetic layer, the first magnetic layer being stacked on the first end surface of the non-magnetic base layer close to the first sub-coil; and

[0028] a second magnetic layer, the second magnetic layer being stacked on the second end surface of the non-magnetic base layer close to the sixth sub-coil;

[0029] Along the stacking direction, the distance between the first sub-coil and the first magnetic layer is H6, the distance between the sixth sub-coil and the second magnetic layer is H7, and 0.75≤H6:H7≤1.25.

[0030] Optionally, the common mode filter further includes:

[0031] A first cover plate, the first cover plate is stacked on a surface of the first magnetic layer that is away from the non-magnetic base layer; and

[0032] A second cover plate is stacked on a surface of the second magnetic layer that is away from the non-magnetic base layer.

[0033] Optionally, the number of odd turns of the first sub-coil, the second sub-coil and the third sub-coil, respectively, starting from the outermost turn, is M. 奇 , the number of even circles is M 偶 , M 奇 ≥M 偶 .

[0034] In a second aspect, the present application discloses an electronic device, comprising the common mode filter described in any one of the above-mentioned first aspects.

[0035] Compared with the prior art, the beneficial effects of this application are:

[0036] In the present application, since the second sub-coil is offset from at least one of the first sub-coil and the third sub-coil in the stacking direction, for the first sub-coil, the second sub-coil and the third sub-coil of the Nth circle, the connecting line between the centers of the turns of the first sub-coil, the second sub-coil and the third sub-coil can form a first triangle. Compared with the method in which the centers of the turns of the first sub-coil, the second sub-coil and the third sub-coil form the same straight line, this can increase the distance between the centers of the turns of the first sub-coil and the second sub-coil to a certain extent, as well as increase the distance between the centers of the turns of the third sub-coil and the second sub-coil.

[0037] When the distance between the center of the turn of the first sub-coil and the center of the turn of the second sub-coil, and the distance between the center of the turn of the third sub-coil and the center of the turn of the second sub-coil are increased, the two distances can be made close to the distance between the center of the turn of the first sub-coil and the center of the turn of the third sub-coil, thereby making the difference in the degree of coupling between the first sub-coil, the second sub-coil and the third sub-coil of the Nth circle smaller, thereby making the coupling balance between the first sub-coil, the second sub-coil and the third sub-coil of the Nth circle better.

[0038] Since the Nth circle can be understood as any circle, the coupling balance between the first sub-coil, the second sub-coil and the third sub-coil in any circle can be better.

[0039] On this basis, further, by making the connection between the centers of the turns of the first sub-coil, the second sub-coil and the third sub-coil of the N+1th circle form a second triangle, and making the second triangle and the first triangle mirror-set with respect to the target plane, the magnetic flux generated by the first sub-coil, the second sub-coil and the third sub-coil of the N+1th circle and the magnetic flux generated by the first sub-coil, the second sub-coil and the third sub-coil of the Nth circle can be eliminated through coupling. In other words, the magnetic flux between adjacent circles can be eliminated through coupling, so that the coupling balance of the entire common mode filter can be further improved.

[0040] It can be seen that by displacing the second sub-coil with at least one of the first sub-coil and the third sub-coil in the stacking direction, and mirroring the second triangle with the first triangle with respect to the target plane, the coupling balance of the entire common mode filter can be improved. Under the premise that the coupling balance of the entire common mode filter is good, the noise filtering effect of the common mode filter can be improved to a certain extent, thereby achieving the improvement of bandwidth suppression and insertion loss performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 is a structural schematic diagram of a common mode filter provided by an embodiment of the present application;

[0043] Figure 2 yes Figure 1 Exploded view of the common mode filter;

[0044] Figure 3 yes Figure 1 A cross-sectional view of the common mode filter at the target cross section;

[0045] Figure 4 yes Figure 3 A local enlarged view of the common mode filter at position A;

[0046] Figure 5 is an exploded view of another common mode filter provided by an embodiment of the present application;

[0047] Figure 6 yes Figure 5 After the common mode filter in the decomposition is removed, Figure 1 A cross-sectional view at the target profile shown;

[0048] Figure 7 yes Figure 5 Schematic diagram of the structure of the common mode filter after decomposition;

[0049] Figure 8 It is a schematic diagram of the structure of an electronic device provided in one embodiment of the application.

[0050] Description of main reference numerals

[0051] 1-first coil; 11-first sub-coil; 12-fourth sub-coil;

[0052] 2-second coil; 21-second sub-coil; 22-fifth sub-coil;

[0053] 3-third coil; 31-third sub-coil; 32-sixth sub-coil;

[0054] 4-non-magnetic base layer; 41-sub-base layer; 42-separation layer; 43-first end surface; 44-second end surface;

[0055] 5- first magnetic layer;

[0056] 6- second magnetic layer;

[0057] 7- first cover plate;

[0058] 8- second cover plate;

[0059] 100-common mode filter; 1000-electronic equipment;

[0060] A1-first triangle; A2-second triangle; S1-target profile; S2-target plane. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0063] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0064] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components, the specific types and structures of which may be the same or different, and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0066] Before explaining the technical solution of the present application, the invention background of the present application is first explained.

[0067] In the related technology, the mipi (Mobile Industry Processor Interface) D-PHY standard is used as a digital data transmission standard for connecting the main IC and electronic devices such as displays and cameras. In this standard, a method of transmitting using differential signals using two transmission lines is adopted. In recent years, the resolution of cameras has increased dramatically. As a higher-speed transmission method, a method of using three transmission lines to transmit different voltages from the transmitting side to each transmission line and obtaining the difference between each line on the receiving side to perform differential output has been put into practical use as the mipi C-PHY standard.

[0068] Common-mode filters are signal noise filtering devices that connect the main IC, display, and camera. With the practical application of mipiC-PHY, higher requirements are placed on the noise filtering capability of common-mode filters.

[0069] However, due to the large difference in the degree of coupling between the coils in the common mode filter in the related art, the coupling balance between the coils is not ideal, which in turn leads to poor noise filtering ability of the common mode filter in the related art. Based on this, a new common mode filter 100 is urgently needed to improve the noise filtering effect and achieve the improvement of bandwidth suppression and insertion loss performance.

[0070] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0071] See also Figure 1 , Figure 1 is a schematic structural diagram of a common mode filter 100 provided in an embodiment of the present application, Figure 2 yes Figure 1 An exploded view of the common mode filter 100, Figure 3 yes Figure 1 The common mode filter 100 in the target profile S1 ( Figure 1 A cross-sectional view at the point indicated by the dashed line.

[0072] See also Figure 1 , Figure 2 and Figure 3 The common mode filter 100 includes: a first coil 1, a second coil 2 and a third coil 3, wherein the first coil 1 includes a first sub-coil 11, the second coil 2 includes a second sub-coil 21, and the third coil 3 includes a third sub-coil 31. The first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 are all spirally laid and stacked in sequence.

[0073] Among them, in the stacking direction ( Figure 3 In the Z-axis direction), the second sub-coil 21 is staggered with at least one of the first sub-coil 11 and the third sub-coil 31 ( Figure 3 The second sub-coil 21 is staggered with the first sub-coil 11 and the third sub-coil 31 respectively).

[0074] In the target cross section S1 parallel to the stacking direction, the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 are respectively located at the center of the Nth turn from the outermost turn ( Figure 3 The line connecting the centers of the N+1th turns (the black dot in the middle) forms the first triangle A1, and the line connecting the centers of the N+1th turns forms the second triangle A2.

[0075] Among the multiple planes perpendicular to the target profile S1, there is a target plane S2 such that the second triangle A2 and the first triangle A1 are mirror images of each other with respect to the target plane S2.

[0076] In this embodiment, due to the stacking direction ( Figure 3 In the Z-axis direction), the second sub-coil 21 is staggered with at least one of the first sub-coil 11 and the third sub-coil 31. Therefore, for the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth turn, the center of the turn of the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 ( Figure 3The connecting line between the two sub-coils (the black dot in the middle) forms a first triangle A1. Compared with the way that the centers of the turns of the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 are on the same straight line, this can increase the distance between the centers of the turns of the first sub-coil 11 and the second sub-coil 21 to a certain extent, as well as increase the distance between the centers of the turns of the third sub-coil 31 and the second sub-coil 21.

[0077] When the distance between the center of the turn of the first sub-coil 11 and the center of the turn of the second sub-coil 21, and the distance between the center of the turn of the third sub-coil 31 and the center of the turn of the second sub-coil 21 are increased, the two distances can be made close to the distance between the center of the turn of the first sub-coil 11 and the center of the turn of the third sub-coil 31, thereby making the difference in the degree of coupling between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle smaller, thereby making the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle better.

[0078] Since the Nth circle can be understood as any circle, the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 in any circle can be better.

[0079] On this basis, further, by making the line connecting the centers of the turns of the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the N+1th circle form a second triangle A2, and making the second triangle A2 and the first triangle A1 mirror-set with respect to the target plane S2, the magnetic flux generated by the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the N+1th circle and the magnetic flux generated by the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle can be eliminated through coupling. In other words, the magnetic flux between adjacent circles can be eliminated through coupling. In this way, the coupling balance of the entire common mode filter 100 can be further improved.

[0080] It can be seen that by staggering the second sub-coil 21 with at least one of the first sub-coil 11 and the third sub-coil 31 in the stacking direction, and mirroring the second triangle A2 and the first triangle A1 with respect to the target plane S2, the coupling balance of the entire common mode filter 100 can be improved.

[0081] Under the premise that the coupling balance of the entire common mode filter 100 is good, the noise filtering effect of the common mode filter 100 can be improved to a certain extent, thereby achieving the improvement of the suppression bandwidth and insertion loss performance.

[0082] In some embodiments, please see Figure 3, in the stacking direction ( Figure 3 In the Z-axis direction), the first sub-coil 11 and the third sub-coil 31 at least partially overlap ( Figure 3 The first sub-coil 11 and the third sub-coil 31 completely overlap).

[0083] By making the first sub-coil 11 and the third sub-coil 31 at least partially overlap, the layout of the first sub-coil 11 and the third sub-coil 31 can be made relatively regular without affecting the coupling balance. Such a setting can simplify the manufacturing process of the first sub-coil 11 and the third sub-coil 31 and reduce the difficulty of manufacturing the first sub-coil 11 and the third sub-coil 31.

[0084] When the centers of the turns of the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle ( Figure 3 When the connecting lines between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle form the first triangle A1, in order to make the difference in coupling degree between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle smaller, the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle is better.

[0085] In some embodiments, see Figure 3 and Figure 4 , Figure 4 yes Figure 3 A partial enlarged view of the common mode filter 100 at position A in FIG. 1 , the distance between the center of the Nth turn of the first sub-coil 11 and the center of the Nth turn of the third sub-coil 31 is L 13 The distance between the center of the Nth turn of the first sub-coil 11 and the center of the Nth turn of the second sub-coil 21 is L 12 The distance between the center of the Nth turn of the second sub-coil 21 and the center of the Nth turn of the third sub-coil 31 is L 23 , L 13 , L 12 and L 23 Satisfies the following formula:

[0086] 0.65≤L 13 :L 12 ≤1.4, and / or, 0.65≤L 13 :L 23 ≤1.4.

[0087] The inventor has found through long-term research that when L 13 :L 12 <0.65, or, L 13 :L 12 >1.4, it will make L 13 With L 12 The gap between them is large. When L13 :L 23 <0.65, or, L 13 :L 23 >1.4, it will make L 13 With L 23 The gap between them is large, which makes the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle significantly reduced. Based on this, by making 0.65≤L 13 :L 12 ≤1.4, and / or, 0.65≤L 13 :L 23 ≤1.4. This can make L 13 With L 12 The gap between, and, L 13 With L 23 The difference between them is within a suitable range, so that the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle is significantly improved, so that the noise filtering ability of the entire common mode filter 100 is stronger.

[0088] Among them, the above L 13 :L 12 It can be any value within the range of 0.65 to 1.4. Specifically, L 13 :L 12 It can be 0.65, 0.66, 0.7, or 1.4, etc., as long as 0.65≤L 13 :L 12 ≤1.4, and this embodiment will not be listed here one by one.

[0089] Similarly, the above L 13 :L 23 It can also be any value within the range of 0.65 to 1.4. Specifically, L 13 :L 23 It can be 0.65, 0.66, 0.7, or 1.4, etc., as long as 0.65≤L 13 :L 23 ≤1.4, and this embodiment will not be listed here one by one.

[0090] In order to further improve the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle, further, in some embodiments, see Figure 4 , 0.85≤L 13 :L 12 ≤1.2, and / or, 0.85≤L 13 :L 23 ≤1.2.

[0091] By making 0.85≤L 13 :L 12 ≤1.2, which can make L 13 With L 12 The gap between them is further reduced, so that the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle can be further improved. Similarly, by making 0.85≤L 13 :L 23 ≤1.2, the coupling balance between the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 of the Nth circle can also be further improved.

[0092] Specifically, L 13 :L 12 It can be any value in the range of 0.85 to 1.2, for example, L 13 :L 12 It can be 0.85, 1 or 1.2, etc., which is not limited in this embodiment. 13 :L 23 It can also be any value in the range of 0.85 to 1.2, for example, L 13 :L 23 It may also be 0.85, 1 or 1.2, etc., which is not limited in this embodiment.

[0093] In some embodiments, see Figure 3 and Figure 4 , along the orthogonal direction of the stacking direction ( Figure 4 In the Y-axis direction), the distance between the center of the Nth turn of the first sub-coil 11 and the center of the Nth turn of the second sub-coil 21 is D1, and the distance between the center of the Nth turn of the second sub-coil 21 and the center of the N+1th turn of the second sub-coil 21 is D2, and D1 is less than D2.

[0094] Since D1 represents the distance between the center of the Nth turn of the first sub-coil 11 and the center of the Nth turn of the second sub-coil 21 in the orthogonal direction along the stacking direction, and D2 represents the distance between the center of the Nth turn of the second sub-coil 21 and the center of the N+1th turn of the second sub-coil 21 in the orthogonal direction along the stacking direction, and the first sub-coil 11 and the second sub-coil 21 are stacked and staggered in the stacking direction, and the Nth turn of the second sub-coil 21 and the N+1th turn of the second sub-coil 21 are located in the same turn layer, therefore, by making D1<D2, D2 and L 12The gap between them is small, so that the coupling between the Nth turn of the first sub-coil 11 and the Nth turn of the second sub-coil 21, as well as the coupling gap between the Nth turn of the second sub-coil 21 and the N+1th turn of the second sub-coil 21 are small, which can further improve the coupling balance of the entire common mode filter 100.

[0095] Similarly, in order to further improve the coupling balance of the entire common mode filter 100, in some embodiments, see Figure 4 , along the orthogonal direction of the stacking direction ( Figure 4 In the Y-axis direction), the distance between the center of the Nth turn of the third sub-coil 31 and the center of the Nth turn of the second sub-coil 21 is D3, and the distance between the center of the Nth turn of the second sub-coil 21 and the center of the N+1th turn of the second sub-coil 21 is D2, and D3 is less than D2.

[0096] By making D3<D2, it can bring about beneficial effects similar to those of D1<D2. For details, please refer to the description of the above embodiment, which will not be described in detail in this embodiment.

[0097] In some embodiments, see Figure 3 The number of odd turns of the first sub-coil 11, the second sub-coil 21 and the third sub-coil 31 from the outermost turn is M 奇 , the number of even circles is M 偶 , M 奇 ≥M 偶 ( Figure 3 Medium 偶 and M 奇 The inventors have found that when M 奇 ≥M 偶 When the common mode filter 100 is used as the input signal, the noise filtering effect of the common mode filter 100 can be further improved to a certain extent, thereby further improving the performance of suppressing bandwidth and insertion loss.

[0098] Specifically, M 奇 The number can be 5, M 偶 The number can be 4, or M 奇 The number can be 3, M 偶 The number can be 2, as long as M 奇 ≥M 偶 That is, the present embodiments will not be listed one by one here.

[0099] In some embodiments, see Figure 2 and Figure 3, the first coil 1 further includes a fourth sub-coil 12, the second coil 2 further includes a fifth sub-coil 22, the third coil 3 further includes a sixth sub-coil 32, the first sub-coil 11, the second sub-coil 21, the third sub-coil 31, the fourth sub-coil 12, the fifth sub-coil 22 and the sixth sub-coil 32 are all spirally laid and sequentially stacked, wherein the first sub-coil 11 is electrically connected to ( Figure 2 The fourth sub-coil 12 (dashed line), the second sub-coil 21 is electrically connected to the fifth sub-coil 22, and the third sub-coil 31 is electrically connected to the sixth sub-coil 32.

[0100] When the first coil 1 also includes the fourth sub-coil 12, the second coil 2 also includes the fifth sub-coil 22, and the third coil 3 also includes the sixth sub-coil 32, the fourth sub-coil 12 and the first sub-coil 11 can form a complete first coil 1, the fifth sub-coil 22 and the second sub-coil 21 can form a complete second coil 2, and the sixth sub-coil 32 and the third sub-coil 31 can form a complete third coil 3. In this way, the first coil 1, the second coil 2 and the third coil 3 can be made larger.

[0101] When the first coil 1, the second coil 2 and the third coil 3 become larger, on the one hand, a larger inductance can be provided, thereby better suppressing high-frequency noise and ripples, and on the other hand, a larger current change can be accommodated.

[0102] In some embodiments, see Figure 3 and Figure 4 , along the stacking direction ( Figure 4 The distance between the first sub-coil 11 and the second sub-coil 21 is H1, the distance between the second sub-coil 21 and the third sub-coil 31 is H2, the distance between the third sub-coil 31 and the fourth sub-coil 12 is H3, the distance between the fourth sub-coil 12 and the fifth sub-coil 22 is H4, and the distance between the fifth sub-coil 22 and the sixth sub-coil 32 is H5. H1, H2, H3, H4 and H5 satisfy the following formula:

[0103] 0.25≤H1: H3≤0.5; 0.25≤H2: H3≤0.5; 0.25≤H4: H3≤0.5; 0.25≤H5: H3≤0.5.

[0104] The inventors have found that when 0.25≤H1:H3≤0.5; 0.25≤H2:H3≤0.5; 0.25≤H4:H3≤0.5; 0.25≤H5:H3≤0.5, the impedance characteristics of the entire common mode filter 100 can be improved, thereby improving the suppression bandwidth and insertion loss performance.

[0105] Specifically, the value of H1:H3 can be 0.25, 0.3 or 0.5, etc., as long as H1:H3 is within the range of 0.25 to 0.5. This embodiment does not limit this.

[0106] Similarly, H2:H3, H4:H3 and H5:H3 may also be 0.25, 0.3 or 0.5, etc., as long as they are within the range of 0.25 to 0.5, and this embodiment does not limit this.

[0107] Further, in some embodiments, see Figure 4 , H1+H2<H3, and / or, H4+H5<H3.

[0108] By making H1+H2<H3, and / or H4+H5<H3, the distance between the third sub-coil 31 and the fourth sub-coil 12 along the stacking direction can be made relatively large. The inventors have found that such a stacking structure can improve the suppression bandwidth of the common mode filter 100 and further enhance the noise filtering capability of the common mode filter 100.

[0109] In some embodiments, see Figure 4 , along the stacking direction ( Figure 4 In the Z-axis direction, the first sub-coil 11 at least partially overlaps with the fourth sub-coil 12, the second sub-coil 21 at least partially overlaps with the fifth sub-coil 22, and the third sub-coil 31 at least partially overlaps with the sixth sub-coil 32.

[0110] Since the first sub-coil 11 and the fourth sub-coil 12 constitute the first coil 1, the second sub-coil 21 and the fifth sub-coil 22 constitute the second coil 2, and the third sub-coil 31 and the sixth sub-coil 32 constitute the third coil 3, by making the first sub-coil 11 and the fourth sub-coil 12 at least partially overlap, the second sub-coil 21 and the fifth sub-coil 22 at least partially overlap, and the third sub-coil 31 and the sixth sub-coil 32 at least partially overlap, the structures of the first coil 1, the second coil 2 and the third coil 3 can be made more regular, respectively. On the one hand, the manufacturing process of the first coil 1, the second coil 2 and the third coil 3 can be simplified, and the manufacturing difficulty of the first coil 1, the second coil 2 and the third coil 3 can be reduced. On the other hand, the inventors have found through research that this stacked structure is also conducive to improving the noise filtering capability of the common mode filter 100.

[0111] In some embodiments, see Figure 2 and Figure 3 The common mode filter 100 also includes: a non-magnetic base layer 4, a first sub-coil 11, a second sub-coil 21, a third sub-coil 31, a fourth sub-coil 12, a fifth sub-coil 22 and a sixth sub-coil 32 are all spirally laid and stacked in sequence in the non-magnetic base layer 4.

[0112] By setting the non-magnetic base layer 4, on the one hand, the non-magnetic base layer 4 can be used as a base on which the first sub-coil 11, the second sub-coil 21, the third sub-coil 31, the fourth sub-coil 12, the fifth sub-coil 22 and the sixth sub-coil 32 are set, making it simple to set the first sub-coil 11, the second sub-coil 21, the third sub-coil 31, the fourth sub-coil 12, the fifth sub-coil 22 and the sixth sub-coil 32.

[0113] On the other hand, the non-magnetic base layer 4 can also protect the first sub-coil 11, the second sub-coil 21, the third sub-coil 31, the fourth sub-coil 12, the fifth sub-coil 22 and the sixth sub-coil 32, making the first sub-coil 11, the second sub-coil 21, the third sub-coil 31, the fourth sub-coil 12, the fifth sub-coil 22 and the sixth sub-coil 32 more reliable.

[0114] On the other hand, the non-magnetic base layer 4 can also play a role of isolation and separation, thereby reducing cross-interference between the sub-coils.

[0115] In some embodiments, see Figure 2 The non-magnetic base layer 4 may include a plurality of sub-base layers 41 , and the first sub-coil 11 , the second sub-coil 21 , the third sub-coil 31 , the fourth sub-coil 12 , the fifth sub-coil 22 and the sixth sub-coil 32 are respectively arranged on a layer of sub-base layer 41 .

[0116] After the first sub-coil 11, the second sub-coil 21, the third sub-coil 31, the fourth sub-coil 12, the fifth sub-coil 22 and the sixth sub-coil 32 are respectively arranged on a layer of sub-base layer 41, the multiple layers of sub-base layers 41 can be stacked up along the stacking direction to form a stacking structure of the common mode filter 100.

[0117] In order to make the distance between the third sub-coil 31 and the fourth sub-coil 12 along the stacking direction relatively larger, in some embodiments, see Figure 2 The non-magnetic base layer 4 may further include a separation layer 42, and the separation layer 42 is located between a layer of sub-base layer 41 corresponding to the third sub-coil 31 and a layer of sub-base layer 41 corresponding to the fourth sub-coil 12 along the stacking direction.

[0118] Such a configuration can make the distance between the third sub-coil 31 and the fourth sub-coil 12 along the stacking direction relatively larger, thereby further improving the suppression bandwidth of the common mode filter 100 and further enhancing the noise filtering capability of the common mode filter 100 .

[0119] The non-magnetic base layer 4 may be made of glass or ceramic, etc., which is not limited in this embodiment.

[0120] In some embodiments, see Figure 5 and Figure 6 , Figure 5 is an exploded view of another common mode filter 100 provided in one embodiment of the present application. Figure 6 yes Figure 5 After the common mode filter 100 in the embodiment is decomposed, Figure 1 The non-magnetic base layer 4 has a first end surface 43 ( Figure 6 The upper surface of the non-magnetic base layer 4) and the second end surface 44 ( Figure 6 The common mode filter 100 further includes: a first magnetic layer 5 and a second magnetic layer 6, wherein the first magnetic layer 5 is stacked on a first end face 43 of the non-magnetic base layer 4 close to the first sub-coil 11, and the second magnetic layer 6 is stacked on a second end face 44 of the non-magnetic base layer 4 close to the sixth sub-coil 32.

[0121] Along the stacking direction ( Figure 6 In the Z-axis direction, the distance between the first sub-coil 11 and the first magnetic layer 5 is H6, the distance between the sixth sub-coil 32 and the second magnetic layer 6 is H7, and 0.75≤H6:H7≤1.25.

[0122] Since the first magnetic layer 5 is stacked on the first end surface 43 of the non-magnetic base layer 4 close to the first sub-coil 11, and the second magnetic layer 6 is stacked on the second end surface 44 of the non-magnetic base layer 4 close to the sixth sub-coil 32, the first magnetic layer 5 and the second magnetic layer 6 can be stacked on opposite sides of the non-magnetic base layer 4 respectively. Such a configuration can further improve the suppression bandwidth and make the structure of the common mode filter 100 more stable.

[0123] In addition, by making 0.75≤H6:H7≤1.25, the inventors have found that such a stacked structure can significantly improve the impedance characteristics of the common mode filter 100, thereby further increasing the suppression bandwidth.

[0124] In addition, by making 0.75≤H6:H7≤1.25, H6:H7 can be within a larger range, so that the requirements for the processing accuracy of the common mode filter 100 can be reduced, thereby reducing the processing difficulty of the common mode filter 100.

[0125] Specifically, the value of H6:H7 can be 0.75, 1 or 1.25, etc. It is sufficient for H6:H7 to be within the range of 0.75 to 1.25, and this embodiment will not list them one by one here.

[0126] In some embodiments, see Figure 5 , Figure 6 and Figure 7 , Figure 7 yes Figure 5 The common mode filter 100 in the figure is a schematic structural diagram after being decomposed. The common mode filter 100 also includes: a first cover plate 7 and a second cover plate 8, wherein the first cover plate 7 is stacked on the side of the first magnetic layer 5 that is away from the non-magnetic base layer 4, and the second cover plate 8 is stacked on the side of the second magnetic layer 6 that is away from the non-magnetic base layer 4.

[0127] By stacking the first cover plate 7 on the side of the first magnetic layer 5 that is away from the non-magnetic base layer 4 and the second cover plate 8 on the side of the second magnetic layer 6 that is away from the non-magnetic base layer 4, the first cover plate 7 and the second cover plate 8 can be wrapped on both sides of the entire common mode filter 100 along the stacking direction. In this way, the first cover plate 7 and the second cover plate 8 can protect the stacking structure. At the same time, they can also play a role in fixing the first magnetic layer 5, the non-magnetic base layer 4 and the second magnetic layer 6 to avoid separation of the first magnetic layer 5, the non-magnetic base layer 4 and the second magnetic layer 6, making the entire common mode filter 100 more sturdy and durable.

[0128] An embodiment of the present application further provides an electronic device 1000, see Figure 8 , Figure 8 1 is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the application. The electronic device 1000 includes a common mode filter 100 .

[0129] Among them, the structure of the common mode filter 100 can be the same as the structure of the common mode filter 100 described in any of the above embodiments, and can bring the same or similar beneficial effects. For details, please refer to the description in the above embodiments, and this embodiment will not be repeated here.

[0130] In this embodiment, since the common mode filter 100 has better noise filtering performance, when the common mode filter 100 is applied to the electronic device 1000, the performance of the electronic device 1000 can be better and the user experience can be better.

[0131] It should be noted that the electronic device 1000 may include but is not limited to a display and a camera, etc., which is not limited in this embodiment.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A common mode filter (100), characterized in that: include: A first coil (1), the first coil (1) comprising a first sub-coil (11); a second coil (2), the second coil (2) comprising a second sub-coil (21); and A third coil (3), the third coil (3) comprising a third sub-coil (31), the first sub-coil (11), the second sub-coil (21) and the third sub-coil (31) are all spirally laid and sequentially stacked at intervals; Wherein, in the stacking direction, the second sub-coil (21) is arranged in a staggered manner with at least one of the first sub-coil (11) and the third sub-coil (31); In a target cross section (S1) parallel to the stacking direction, the lines connecting the centers of the Nth turn of the first sub-coil (11), the second sub-coil (21) and the third sub-coil (31) respectively from the outermost turn form a first triangle (A1), and the lines connecting the centers of the N+1th turn of the first sub-coil (11), the second sub-coil (21) and the third sub-coil (31) form a second triangle (A2); Among a plurality of planes perpendicular to the target section (S1), there exists a target plane (S2) such that the second triangle (A2) and the first triangle (A1) are mirror images of each other with respect to the target plane (S2).

2. The common mode filter (100) according to claim 1, characterized in that: In the stacking direction, the first sub-coil (11) and the third sub-coil (31) at least partially overlap.

3. The common mode filter (100) according to claim 1, characterized in that The distance between the center of the Nth turn of the first sub-coil (11) and the center of the Nth turn of the third sub-coil (31) is L. 13 The distance between the center of the Nth turn of the first sub-coil (11) and the center of the Nth turn of the second sub-coil (21) is L 12 The distance between the center of the Nth turn of the second sub-coil (21) and the center of the Nth turn of the third sub-coil (31) is L 23 , L 13 , L 12 and L 23 Satisfies the following formula: 0.65≤L 13 :L 12 ≤1.4, and / or, 0.65≤L 13 :L 23 ≤1.

4.

4. The common mode filter (100) according to claim 3, characterized in that: 0.85≤L 13 :L 12 ≤1.2, and / or, 0.85≤L 13 :L 23 ≤1.

2.

5. The common mode filter (100) according to claim 1, characterized in that: In a direction orthogonal to the stacking direction, the distance between the center of the Nth turn of the first sub-coil (11) and the center of the Nth turn of the second sub-coil (21) is D1, and the distance between the center of the Nth turn of the second sub-coil (21) and the center of the N+1th turn of the second sub-coil (21) is D2, and D1<D2; and / or, In the orthogonal direction along the stacking direction, the distance between the center of the Nth turn of the third sub-coil (31) and the center of the Nth turn of the second sub-coil (21) is D3, and the distance between the center of the Nth turn of the second sub-coil (21) and the center of the N+1th turn of the second sub-coil (21) is D2, and D3<D2.

6. The common mode filter (100) according to any one of claims 1 to 5, characterized in that: The first coil (1) further includes a fourth sub-coil (12), the second coil (2) further includes a fifth sub-coil (22), and the third coil (3) further includes a sixth sub-coil (32). The first sub-coil (11), the second sub-coil (21), the third sub-coil (31), the fourth sub-coil (12), the fifth sub-coil (22) and the sixth sub-coil (32) are all spirally laid and sequentially stacked in an interlaced manner, wherein the first sub-coil (11) is electrically connected to the fourth sub-coil (12), the second sub-coil (21) is electrically connected to the fifth sub-coil (22), and the third sub-coil (31) is electrically connected to the sixth sub-coil (32).

7. The common mode filter (100) according to claim 6, characterized in that: Along the stacking direction, the distance between the first sub-coil (11) and the second sub-coil (21) is H1, the distance between the second sub-coil (21) and the third sub-coil (31) is H2, the distance between the third sub-coil (31) and the fourth sub-coil (12) is H3, the distance between the fourth sub-coil (12) and the fifth sub-coil (22) is H4, and the distance between the fifth sub-coil (22) and the sixth sub-coil (32) is H5, and H1, H2, H3, H4 and H5 satisfy the following formula: 0.25≤H1: H3≤0.5; 0.25≤H2: H3≤0.5; 0.25≤H4: H3≤0.5; 0.25≤H5: H3≤0.

5.

8. The common mode filter (100) according to claim 7, characterized in that: H1+H2<H3, and / or, H4+H5<H3.

9. The common mode filter (100) according to claim 6, characterized in that: Along the stacking direction, the first sub-coil (11) at least partially overlaps with the fourth sub-coil (12), the second sub-coil (21) at least partially overlaps with the fifth sub-coil (22), and the third sub-coil (31) at least partially overlaps with the sixth sub-coil (32).

10. The common mode filter (100) according to claim 6, characterized in that: The common mode filter (100) further comprises: A non-magnetic base layer (4), wherein the first sub-coil (11), the second sub-coil (21), the third sub-coil (31), the fourth sub-coil (12), the fifth sub-coil (22) and the sixth sub-coil (32) are all spirally laid and sequentially stacked in the non-magnetic base layer (4).

11. The common mode filter (100) according to claim 10, characterized in that: The non-magnetic base layer (4) has a first end surface (43) and a second end surface (44) disposed opposite to each other, and the common mode filter (100) further comprises: a first magnetic layer (5), the first magnetic layer (5) being stacked on the first end surface (43) of the non-magnetic base layer (4) close to the first sub-coil (11); and A second magnetic layer (6), the second magnetic layer (6) being stacked on the second end surface (44) of the non-magnetic base layer (4) close to the sixth sub-coil (32); Along the stacking direction, the distance between the first sub-coil (11) and the first magnetic layer (5) is H6, the distance between the sixth sub-coil (32) and the second magnetic layer (6) is H7, and 0.75≤H6:H7≤1.

25.

12. The common mode filter (100) according to claim 11, characterized in that The common mode filter (100) further comprises: a first cover plate (7), the first cover plate (7) being stacked on a surface of the first magnetic layer (5) that is away from the non-magnetic base layer (4); and A second cover plate (8), the second cover plate (8) being stacked on a surface of the second magnetic layer (6) that is away from the non-magnetic base layer (4).

13. The common mode filter (100) according to any one of claims 1 to 5 or 7 to 12, characterized in that: The number of odd turns of the first sub-coil (11), the second sub-coil (21) and the third sub-coil (31) respectively, counted from the outermost turns, is M. 奇 , the number of even circles is M 偶 , M 奇 ≥M 偶 .

14. An electronic device (1000), characterized in that: The common mode filter (100) comprises any one of claims 1-13.

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