CN211578566U - Filter and electromagnetic element - Google Patents
Filter and electromagnetic element Download PDFInfo
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- CN211578566U CN211578566U CN201922394212.3U CN201922394212U CN211578566U CN 211578566 U CN211578566 U CN 211578566U CN 201922394212 U CN201922394212 U CN 201922394212U CN 211578566 U CN211578566 U CN 211578566U
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Abstract
The application discloses a filter and an electromagnetic element. The filter includes: the transmission line comprises a substrate, a magnetic core, a transmission line layer and a conductive piece; the substrate comprises a central part and a peripheral part, wherein the central part is provided with a plurality of inner through holes penetrating through the substrate, the peripheral part is provided with a plurality of outer through holes penetrating through the substrate, and an annular accommodating groove is formed between the central part and the peripheral part to accommodate the magnetic core; the transmission line layers are arranged on two opposite sides of the substrate and comprise a plurality of conducting wire patterns which are arranged at intervals along the circumferential direction of the annular accommodating groove, and each conducting wire pattern is bridged between one corresponding inner conducting hole and one corresponding outer conducting hole; the plurality of conductive pieces are arranged in the inner conducting hole and the outer conducting hole and used for sequentially connecting the conductive wire patterns on the two transmission line layers so as to form a coil loop for transmitting current around the magnetic core; a shielding pattern is arranged between two adjacent conductor patterns. By providing the shielding pattern, the stability of the transmission signal of the conductor pattern can be improved.
Description
Technical Field
The application relates to the technical field of electromagnetic element manufacturing, in particular to a filter and an electromagnetic element.
Background
In a conventional embedded electromagnetic device, a core is embedded in a substrate, conductive metal layers are disposed on two sides of the substrate, and the conductive metal layers on the two sides are electrically connected by punching, so as to form a wire turn around the core.
However, due to the small size of the existing embedded magnetic electromagnetic device, electromagnetic interference is easily generated between adjacent coils in the coil turns during the operation process, and the signal transmitted by the embedded magnetic electromagnetic device is unstable.
SUMMERY OF THE UTILITY MODEL
The application provides a wave filter, electromagnetic element to solve bury among the prior art magnetism formula electromagnetic device because the volume is less, produce electromagnetic interference each other easily between the adjacent coil of in-process of work, lead to burying the unstable problem of signal of magnetism formula electromagnetic device transmission.
In order to solve the technical problem, the application adopts a technical scheme that: providing a filter, wherein the filter comprises:
a substrate, comprising:
a central portion having a plurality of inner via holes formed therethrough; and
a peripheral portion having a plurality of external via holes formed therethrough; an annular receiving groove is formed between the central portion and the peripheral portion;
the magnetic core is accommodated in the annular accommodating groove;
the transmission line layers are respectively arranged on two opposite sides of the substrate, each transmission line layer comprises a plurality of first lead patterns which are arranged at intervals along the circumferential direction of the annular containing groove, and each first lead pattern is bridged between one corresponding inner via hole and one corresponding outer via hole; and
a plurality of conductive members disposed in the inner via hole and the outer via hole for sequentially connecting the first conductive wire patterns on the two transmission line layers to form a coil loop capable of transmitting current around the magnetic core;
second conductor patterns are further arranged in the circumferential direction of the annular accommodating groove, the second conductor patterns are arranged at intervals in the circumferential direction of the annular accommodating groove, and each second conductor pattern is arranged between two adjacent first conductor patterns.
Wherein a thickness of the second conductive line pattern is the same as a thickness of the first conductive line pattern in a direction from the transmission line layer to the substrate.
Wherein the transmission line layer includes a plurality of the second conductive line patterns, each of the second conductive line patterns being disposed between two adjacent first conductive line patterns;
at least two first conductive wire patterns are arranged between two adjacent second conductive wire patterns.
And the space between each second conducting wire pattern and the first conducting wire patterns on two sides of the second conducting wire pattern is equal.
And the second conducting wire patterns extend towards the direction close to the central part and are electrically connected.
Wherein the second conductive line patterns are all grounded.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided an electromagnetic device, wherein the electromagnetic device comprises a transformer and a filter as described in the foregoing, wherein the transmission line layer of the filter is electrically connected to the transformer.
Wherein the second conductor pattern is electrically connected with a center tap of the transformer.
Wherein the transformer includes an input line and a coupling line, and the transmission line layer of the filter is electrically connected to the coupling line.
This application sets up the second wire pattern through on the transmission line layer of burying magnetic filter, can play the electromagnetic shield effect to the first wire pattern that sets up on the transmission line layer, and then makes the signal of first wire pattern transmission more stable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of an embodiment of a filter provided in the present application;
FIG. 2 is a schematic diagram of the substrate and core assembly of the filter of FIG. 1;
FIG. 3 is a schematic structural diagram of a cross-sectional view of the filter of FIG. 1 at section A-A;
FIG. 4 is a schematic diagram of an embodiment of the arrangement of the second conductive patterns of the filter shown in FIG. 1;
FIG. 5 is a schematic diagram of another embodiment of the arrangement of the second conductive patterns of the filter shown in FIG. 1;
FIG. 6 is a schematic diagram of another embodiment of the arrangement of the second conductive patterns of the filter shown in FIG. 1;
fig. 7 is a schematic flowchart of an embodiment of a filter manufacturing method provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Referring to fig. 1 to fig. 3, fig. 1 is a schematic structural diagram of an embodiment of a filter provided in the present application, and fig. 2 is a schematic structural diagram of a substrate and a magnetic core in the filter shown in fig. 1; fig. 3 is a schematic structural view of a cross-sectional view of the filter shown in fig. 1 at a-a section.
The filter 110 may generally include: a substrate 10, a magnetic core 16 embedded in the substrate 10, a plurality of conductive connectors 17, and transmission line layers (divided into a first transmission line layer 20 and a second transmission line layer 30) disposed on opposite sides of the substrate 10.
Wherein the substrate may be made of a resin material. The reinforced material is soaked with resin adhesive and is prepared by the processes of drying, cutting, laminating and the like.
The substrate 10 may include a central portion 12 and a peripheral portion 14 disposed around the central portion 12. An annular receiving groove 18 is formed between the central portion 12 and the peripheral portion 14 of the substrate 10 for receiving the magnetic core 16.
In the present embodiment, the central portion 12 and the peripheral portion 14 may be a unitary structure, i.e., the substrate 10 is divided into the central portion 12 and the peripheral portion 14 by forming an annular receiving groove 18 at the center of the substrate 10. Of course, in other embodiments, the central portion 12 and the peripheral portion 14 may be separate structures, for example, a circular receiving groove is formed in the center of the substrate 10, and then the central portion 12 is fixed in the circular receiving groove by, for example, bonding, so that the annular receiving groove 18 is formed between the central portion 12 and the peripheral portion 14, and both end surfaces of the central portion 12 and the peripheral portion 14 are flush.
In the present embodiment, the cross-sectional shape of the annular receiving groove 18 is substantially the same as the cross-sectional shape of the magnetic core 16, so that the magnetic core 16 can be received in the annular receiving groove 18.
With continued reference to fig. 1-3, a plurality of inner through holes 13 are formed through the central portion 12 at the central portion 12. Wherein a plurality of inner through holes 13 are provided adjacent to the outer side wall of the central portion 12 and arranged along the circumferential direction of the central portion 12. Correspondingly, a plurality of outer via holes 15 penetrating through the outer peripheral portion 14 are opened on the outer peripheral portion 14, and the plurality of outer via holes 15 are disposed adjacent to the inner side wall of the outer peripheral portion 14, that is: the inner via 13 is provided around the top inner peripheral wall of the core 16 at the position of the central portion 12, and the outer via 15 is provided around the top outer peripheral wall of the core 16 at the position of the outer peripheral portion 14.
Further, a plurality of conductive members 17 may be disposed in the inner via hole 13 and the outer via hole 15, and the conductive members 17 electrically connect the first transmission line layer 20 and the second transmission line layer 30 positioned at both sides of the substrate 10.
In one embodiment, the conductive element 17 may be a metal pillar, and the diameter of the metal pillar corresponding to each inner via hole 13 or each outer via hole 15 is smaller than or equal to the diameter of the inner via hole 13 or the outer via hole 15 in which it is located. The material of the metal pillar includes, but is not limited to, copper, aluminum, iron, nickel, gold, silver, platinum group, chromium, magnesium, tungsten, molybdenum, lead, tin, indium, zinc, or alloys thereof, and the like.
In the present embodiment, referring to fig. 2, a metal layer may be formed on inner walls of the inner via hole 13 and the outer via hole 15 by, for example, plating, coating, etc., thereby electrically connecting the transmission line layers 20 and 30 located at opposite sides of the substrate 10. The material of the metal layer is the same as that of the metal pillar in the previous embodiment, and is not described herein again. The inside of the inner via 13 and the outside via 15 may be filled with an insulating material, such as resin or ink, and the height of the insulating material is substantially equal to the thickness of the substrate.
The first transmission line layer 20 and the second transmission line layer 30 each include a plurality of first conductor patterns 22 thereon; each of the first conductive patterns 22 is bridged between a corresponding one of the inner via holes 13 and one of the outer via holes 15, and has one end connected to the conductive member 17 in the inner via hole 13 and the other end connected to the conductive member 17 in the outer via hole 15. Accordingly, the conductive piece 17 in the inner via hole 13 and the conductive piece 17 in the outer via hole 15 sequentially connect the first conductive line patterns 22 on the first transmission line layer 20 and the second transmission line layer 30, thereby forming a coil loop capable of transmitting current around the magnetic core 16. Here, the plurality of first conductive line patterns 22 and the inner and outer via holes 13 and 15 connected thereto may form a signal transmission loop, and the signal transmission loop may filter a transmitted signal.
A plurality of second conductive line patterns 24 may be disposed on each transmission line layer, wherein each second conductive line pattern 24 may be disposed between two adjacent first conductive line patterns 22 on the same transmission line layer.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of an arrangement manner of second conductive patterns of the filter shown in fig. 1. In this embodiment, the second conductive patterns 24 and the first conductive patterns 22 are disposed in the same layer, and the thickness of all the second conductive patterns 24 and the thickness of the first conductive patterns 22 may be the same in the direction from the transmission line layer to the substrate 10.
All the second conductive line patterns 24 are uniformly arranged along the circumferential direction of the annular receiving groove 18, and at least two first conductive line patterns 22 may be arranged between two adjacent second conductive line patterns 24, for example, 2, 3, 4, 5, 6 first conductive line patterns 22 may be arranged between two adjacent second conductive line patterns 24.
In this embodiment, in order to further improve the shielding effect, the shape of the second conductive line patterns 24 may be adjusted so that all the second conductive line patterns 24 may tend to cover the entire transmission line layer. Wherein, the spacing between each second conductive line pattern 24 and the adjacent first conductive line pattern 22 may be equal everywhere; each second conductive line pattern 24 is interposed between two first conductive line patterns 22, and for each second conductive line pattern 24, a distance between one side of the second conductive line pattern 24 and the adjacent first conductive line pattern 22 is a first distance H, and a distance between the other side of the second conductive line pattern 24 and the adjacent first conductive line pattern 22 is a second distance L, where the first distance H is the second distance L.
Referring to fig. 4, in the present embodiment, the plurality of second conductive line patterns 24 are uniformly disposed along the circumferential direction of the annular receiving groove 18, wherein all of the second conductive line patterns 24 may be disposed in a grounded manner, and all of the second conductive line patterns 24 may not intersect.
In an embodiment of the invention, one ends of the plurality of second conductive traces 24 may be electrically connected after intersecting, please refer to fig. 5, and fig. 5 is a schematic structural diagram of another embodiment of an arrangement manner of the second conductive traces of the filter shown in fig. 1.
In the same transmission line layer, the plurality of second conductive line patterns 24 are also uniformly arranged along the circumferential direction of the annular receiving groove 18, and one ends of all the second conductive line patterns 24 close to the central portion 12 may extend and meet in a direction close to the central portion 10, so that all the second conductive line patterns 24 may meet and be electrically connected at a position close to the central portion 12.
Further, in other embodiments, only one end of a portion of the second conductive patterns 24 near the central portion 12 may extend and meet in a direction near the central portion 10, and another portion of the second conductive patterns 24 may not intersect with other second conductive patterns 24 in the same transmission line layer.
Further, referring to fig. 6, fig. 6 is a schematic structural diagram of another embodiment of an arrangement manner of second conductive patterns of the filter shown in fig. 1. When the plurality of second conductive patterns 24 are connected at the position of the central portion 10 in a meeting manner, a via hole 26 may be further formed at the meeting position, and the same conductive member 17 as described above may be also provided in the via hole 26 to electrically connect the second conductive patterns 24 on both sides of the substrate 10.
Therefore, in the present application, by disposing the second conductive line pattern 24 in the same transmission line layer as the first conductive line pattern 22, the first conductive line pattern 22 can be electromagnetically shielded, and thus the signal transmitted by the first conductive line pattern 22 is more stable.
Further, the present application also provides an electromagnetic device, wherein the electromagnetic device may comprise a transformer and the filter 110 as described in the foregoing, wherein the transmission line layer of the filter 110 is electrically connected to the transformer.
Wherein the transmission line layer of the filter 110 may be electrically connected to the transformer electrical coupling line layer, thereby filtering the coupling signal of the transformer. Wherein the second conductor patterns 24 of the filter 110 may be all grounded or may be connected to the center tap of the transformer.
Further, the present application also provides a method for manufacturing a filter, please refer to fig. 7, and fig. 7 is a schematic flowchart of an embodiment of the method for manufacturing a filter provided in the present application. The manufacturing method specifically comprises the following steps:
s110: a substrate is provided and an annular receiving groove is formed in the substrate to divide the substrate into a central portion and a peripheral portion.
In this embodiment, the substrate 10 may be a plate material without a conductive metal layer, and any surface of the substrate 10 may be provided with the annular accommodating groove 18. In still another embodiment, a base block may be further provided, wherein the base block includes a substrate 10, a connection layer, and a transmission line layer, which are sequentially stacked; and an annular receiving groove 18 is opened at a side of the substrate 10 where the transmission line layer is not disposed to divide the substrate 10 into a central portion 12 and an outer peripheral portion 14.
The base plate 10 may be made of a resin material having a flame resistance rating of FR4, and the annular receiving groove 18 may be milled in the base plate 10 by a groove milling process.
S120: and embedding the magnetic core matched with the shape of the annular accommodating groove into the annular accommodating groove.
Wherein the magnetic core 16 may comprise a magnetic metal oxide such as manganese-zinc ferrite or nickel-zinc ferrite. Wherein the magnetic core 16 may be disposed into the annular receiving groove 18 by way of an interference fit such that the magnetic core 16 may be secured in the annular receiving groove 18 of the substrate 10. In another embodiment, the size of the magnetic core 16 is slightly smaller than the size of the annular receiving groove 18, and the height of the magnetic core 16 should be smaller than or equal to the height of the annular receiving groove, so as to reduce the pressure borne by the magnetic core 16 during small pressing and reduce the probability of breaking the magnetic core 16.
Wherein, part or all of the surface of the magnetic core 16 may be wrapped by an elastic material, then the magnetic cores 16 (wherein, the number of the magnetic cores 16 may be one and/or N, and part or all of the surface of at least one magnetic core 16 of the N magnetic cores is wrapped by the elastic material) are respectively disposed in the corresponding annular receiving grooves 18, and then an insulating layer is disposed on the surface of the substrate 10 on the opening side of the corresponding annular receiving groove 18, so as to form a cavity (a closed cavity or a non-closed cavity) for receiving the magnetic cores 16.
Further, the surface of the magnetic core 16 may be provided with a coating by which the magnetic core 16 is fixed in the annular receiving groove 18.
S130: and two sides of the substrate are respectively provided with a conducting strip in a pressing way.
The two conducting strips are respectively arranged on two sides of the substrate 10, and the two conducting strips are respectively arranged on two sides of the substrate 10 and fixedly connected with the substrate 10 in a hot pressing mode. Wherein, all can set up the articulamentum between each conducting strip and the base plate 10, make conducting strip and base plate 10 can realize hot pressing fixedly through the articulamentum.
S140: an inner via hole penetrating through the substrate and the two conducting sheets is formed at the corresponding central part, and an outer via hole penetrating through the substrate and the two conducting sheets is formed at the corresponding peripheral part.
After the two conductive sheets on both sides of the substrate 10 are provided, the inner via 13 needs to be opened at the center portion 12 of the substrate 10, and the outer via 15 needs to be opened at the outer peripheral portion 14. Wherein the inner via 13 and the outer via 15 both penetrate the substrate 10 and both conducting strips.
S150: etching each conducting sheet to form a plurality of first conducting wire patterns and a plurality of second conducting wire patterns on each conducting sheet, wherein each second conducting wire pattern is arranged between two adjacent first conducting wire patterns, each first conducting wire pattern is bridged between one corresponding inner conducting hole and one corresponding outer conducting hole, and the plurality of first conducting wire patterns are arranged at intervals along the circumferential direction of the annular accommodating groove; all the conductive pieces in the internal conductive holes and the conductive pieces in the external conductive holes are sequentially connected with the corresponding first wire patterns on the two transmission line layers, so that a coil loop capable of transmitting current around the magnetic core is formed.
The shapes and the arrangement of the second conductive patterns 24 and the first conductive patterns 22 in this step can be referred to above, and are not described herein.
In summary, the present application provides a filter and an electromagnetic element, in which a second conductive line pattern is disposed on a transmission line layer of the filter on the same layer as a first conductive line pattern, so that stability of a signal transmitted by the first conductive line pattern can be improved.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A filter, characterized in that the filter comprises:
a substrate, comprising:
a central portion having a plurality of inner via holes formed therethrough; and
a peripheral portion having a plurality of external via holes formed therethrough; an annular receiving groove is formed between the central portion and the peripheral portion;
the magnetic core is accommodated in the annular accommodating groove;
the transmission line layers are respectively arranged on two opposite sides of the substrate, each transmission line layer comprises a plurality of first lead patterns which are arranged at intervals along the circumferential direction of the annular containing groove, and each first lead pattern is bridged between one corresponding inner via hole and one corresponding outer via hole; and
a plurality of conductive members respectively disposed in each of the inner via holes and each of the outer via holes, for sequentially connecting the plurality of first conductive wire patterns on the two transmission line layers, thereby forming a coil loop capable of winding the magnetic core;
the transmission line layer further comprises second conducting wire patterns which are arranged at intervals in the circumferential direction of the annular accommodating groove, and the second conducting wire patterns are arranged between every two adjacent first conducting wire patterns.
2. The filter according to claim 1, wherein a thickness of the second conductor pattern is the same as a thickness of the first conductor pattern in a direction from the transmission line layer to the substrate.
3. The filter according to claim 1, wherein the transmission line layer includes a plurality of the second conductor patterns, each of the second conductor patterns being disposed between adjacent two of the first conductor patterns;
at least two first conductive wire patterns are arranged between two adjacent second conductive wire patterns.
4. The filter according to claim 1, wherein a spacing between one side of the second conductor pattern and the first conductor pattern disposed adjacent thereto is a first spacing; the distance between the other side of the second conducting wire pattern and the first conducting wire pattern arranged adjacent to the second conducting wire pattern is a second distance, and the first distance is equal to the second distance.
5. The filter of claim 1, wherein a plurality of the second conductor patterns each extend in a direction close to the central portion and meet at the central portion.
6. The filter of claim 5, wherein a via hole penetrating through the substrate is further formed in the central portion, and a conductive member is further disposed in the via hole, and the conductive member is electrically connected to the two second conductive patterns on opposite sides of the substrate, respectively.
7. The filter of claim 5, wherein the second conductor patterns are each grounded.
8. An electromagnetic device, characterized in that the electromagnetic device comprises a transformer and a filter according to any of claims 1-7, wherein the first conductor pattern of the filter is electrically connected to the transformer.
9. The electromagnetic device of claim 8, wherein the second conductor pattern is electrically connected to a center tap of the transformer.
10. The electromagnetic device of claim 8, wherein the transformer includes an input line and a coupled line, the first conductor pattern of the filter being electrically connected to the coupled line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922394212.3U CN211578566U (en) | 2019-12-26 | 2019-12-26 | Filter and electromagnetic element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922394212.3U CN211578566U (en) | 2019-12-26 | 2019-12-26 | Filter and electromagnetic element |
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| Publication Number | Publication Date |
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| CN211578566U true CN211578566U (en) | 2020-09-25 |
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| CN201922394212.3U Active CN211578566U (en) | 2019-12-26 | 2019-12-26 | Filter and electromagnetic element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113053642A (en) * | 2019-12-26 | 2021-06-29 | 深南电路股份有限公司 | Filter, manufacturing method thereof and electromagnetic element |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113053642A (en) * | 2019-12-26 | 2021-06-29 | 深南电路股份有限公司 | Filter, manufacturing method thereof and electromagnetic element |
| CN113053642B (en) * | 2019-12-26 | 2024-06-07 | 深南电路股份有限公司 | Filter, manufacturing method thereof and electromagnetic element |
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