CN210467523U

CN210467523U - Electromagnetic element

Info

Publication number: CN210467523U
Application number: CN201921006407.XU
Authority: CN
Inventors: 郭伟静
Original assignee: Shennan Circuit Co Ltd
Current assignee: Shennan Circuit Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-05-05
Anticipated expiration: 2029-06-28

Abstract

The application discloses electromagnetic component, electromagnetic component includes: the transmission line comprises a substrate, a magnetic core, a transmission line layer and a plurality of conductive parts; 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; wherein, an air gap is arranged on the magnetic core. The air gap is arranged on the magnetic core, so that the stability of the magnetic core on the influence of current can be improved.

Description

Electromagnetic element

Technical Field

The application relates to the technical field of electromagnetic element manufacturing, in particular to 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, the existing embedded magnetic electromagnetic device is easily affected by the current in the wire turns during the operation process, so that the magnetic saturation phenomenon occurs.

SUMMERY OF THE UTILITY MODEL

The application provides an electromagnetic element to solve among the prior art and bury magnetic-type electromagnetic device and receive the current influence in the turn easily at the in-process of work, the problem of the appearance magnetic saturation phenomenon that leads to.

In order to solve the technical problem, the application adopts a technical scheme that: providing an electromagnetic element, wherein the electromagnetic element 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 conductor patterns which are arranged at intervals along the circumferential direction of the annular accommodating groove, and each conductor pattern is bridged between one corresponding inner conducting hole and one corresponding outer conducting hole; and

a plurality of conductive members disposed in the inner via hole and the outer via hole for sequentially connecting the conductive wire patterns on the two transmission line layers to form a coil loop capable of transmitting current around the magnetic core;

the magnetic core is provided with an opening for cutting off the annular body of the magnetic core so as to form an air gap of the magnetic core.

Wherein the opening is arranged along a direction in which a center of the magnetic core extends to an outer contour of the magnetic core.

Wherein the opening width is equal everywhere in a direction extending along a center of the magnetic core to an outer contour of the magnetic core.

Wherein the width of the opening is 0.2-0.5 mm.

The magnetic core is characterized by being a circular ring body or a square ring body.

Wherein, the electromagnetic element is a transformer, a filter or an inductor.

Wherein the substrate is formed of a resin material, and the core is formed of a ferrite core material.

This application sets up the air gap of magnetic core through the magnetic core to burying magnetic-type electromagnetic component to can avoid electromagnetic component magnetic saturation's in-process to appear problem, thereby can increase the stability of magnetic core itself to the electric current influence.

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 illustrating an exemplary electromagnetic component according to the present disclosure;

FIG. 2 is a schematic diagram of a structure of the electromagnetic component shown in FIG. 1 in which a substrate and a magnetic core are engaged;

FIG. 3 is a schematic structural diagram of a cross-sectional view of the electromagnetic component shown in FIG. 1 at section A-A';

FIG. 4 is a schematic flow chart diagram illustrating one embodiment of a method for manufacturing an electromagnetic component provided herein;

fig. 5 is a schematic flow chart of another embodiment of a method for manufacturing an electromagnetic element 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 an electromagnetic element provided in the present application, and fig. 2 is a schematic structural diagram of a substrate and a magnetic core of the electromagnetic element shown in fig. 1; fig. 3 is a schematic structural view of a cross-sectional view of the electromagnetic component shown in fig. 1 at a section a-a'.

The electromagnetic element 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 top surface of the central portion 12, and the outer via 15 is provided around the top outer peripheral wall of the core 16 at the top surface 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.

An opening 161 is formed on the magnetic core 16, and the opening 161 cuts off one end of the closed ring-shaped magnetic core 16, so that an air gap of the magnetic core 16 can be formed. The function of the opening 161 is to avoid the problem of magnetic saturation of the electromagnetic element during operation, so as to increase the stability of the magnetic core itself against the influence of the current.

The shape of the magnetic core 16 as described above may be circular, square, elliptical, etc. The opening 161 may be disposed along a direction extending from the center of the core 16 to the outer contour of the core 16. Specifically, taking the magnetic core 16 as an example of a circular ring shape, the opening 161 may be provided on a connection line from the center of the magnetic core 16 to the outer end portion of the magnetic core 16, wherein the width of the opening 161 is equal everywhere. And the width of the opening may be set to 0.2-0.5mm, in particular embodiments the width of the opening 161 may be set to 0.2, 0.3, 0.4 or 0.5 mm.

In this embodiment, the electromagnetic element 110 may be a transformer, a filter, or an inductor. It may also be an integrated transformer consisting of a combination of a transformer and a filter.

Further, the present application also provides a method for manufacturing an electromagnetic element, please refer to fig. 4, and fig. 4 is a schematic flowchart of an embodiment of the method for manufacturing an electromagnetic element provided by the present application. The manufacturing method specifically comprises the following steps.

S110: a substrate 10 is provided and an annular receiving groove 18 is provided in the substrate 10 to divide the substrate 10 into a central portion 12 and a peripheral portion 14.

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: the magnetic core 16 matching the shape of the annular receiving groove 18 is embedded in the annular receiving groove 18.

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: a conductive sheet is respectively pressed on both sides of the substrate 10.

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 13 is opened through the substrate 10 and the two conductive sheets at the corresponding central portion 12, and an outer via 15 is opened through the substrate 10 and the two conductive sheets at the corresponding peripheral portion 14.

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: a plurality of conductive patterns 22 are formed on each conductive sheet to form a transmission line layer, and a conductive member 17 is disposed in each inner via hole 13 and each outer via hole 15. The plurality of conductive patterns 22 are arranged at intervals along the circumferential direction of the annular receiving groove 18, and each conductive pattern 22 is bridged between a corresponding one of the inner via holes 13 and one of the outer via holes 15. All of the conductive elements 17 in the inner via holes 13 and the conductive elements 17 in the outer via holes 15 are connected in sequence to the corresponding conductive line patterns 22 on the two transmission line layers 30, thereby forming a coil loop capable of transmitting current around the magnetic core 16.

Wherein the conductive line pattern 22 having a predetermined shape and number can be obtained by performing an etching process on the conductive sheet; conductive members are formed on inner walls of the inner via hole 13 and the outer via hole 15 in the form of plating to form conductive through holes to electrically connect the conductive patterns 22 at both sides of the substrate 10, thereby forming turns disposed around the magnetic core.

S160: and cutting the magnetic core in the substrate at a preset position on one side of the substrate to form an air gap of the magnetic core.

In this step, after step S150 is completed, that is, after the conductive sheet is etched to form the required conductive wire pattern 22, the magnetic core 16 is cut by laser cutting, so that the magnetic core 16 can form the opening 161 as described above, and thus the air gap of the magnetic core 16 is formed. When the magnetic core 16 is cut, the cutting position thereof does not intersect the conductor pattern 22, i.e., the cutting position of laser cutting may be disposed between two adjacent conductor patterns 22.

Further, the present application also provides another method for manufacturing an electromagnetic element, please refer to fig. 5, and fig. 5 is a schematic flow chart of another embodiment of the method for manufacturing an electromagnetic element provided by the present application.

S210: the toroidal core is cut to form the air gap of the core.

In this step, the magnetic core 16 having a predetermined size may be selected, and then one side of the magnetic core 16 may be cut, thereby forming an air gap of the magnetic core 16.

S220: and arranging the magnetic core with the air gap formed into a substrate with an annular accommodating groove, wherein the annular accommodating groove divides the substrate into a central part and a peripheral part.

After the step S210 is completed, the air gap of the magnetic core 16 is processed, and then the magnetic core 16 with the air gap is disposed in a predetermined substrate, wherein an annular groove matching with the shape of the magnetic core 16 is disposed on the substrate, and the magnetic core 16 is received in the annular groove.

S230: pressing a conducting strip on each of two sides of the substrate;

s240: a plurality of inner through holes penetrating through the substrate and the conducting plate are formed at the corresponding central part, and a plurality of outer through holes penetrating through the substrate and the conducting plate are formed at the corresponding peripheral part;

s250: manufacturing a plurality of conducting wire patterns on each conducting sheet to form a transmission line layer, and respectively arranging a conducting piece in each internal conducting hole and each external conducting hole; the plurality of conductor patterns are arranged at intervals along the circumferential direction of the annular accommodating groove, each conductor pattern is bridged between one corresponding inner conducting hole and one corresponding outer conducting hole, and the conductor patterns are sequentially connected through the conductive pieces to form a coil loop capable of transmitting current around the magnetic core.

The method in this embodiment differs from the electromagnetic components provided in the previous embodiments in that:

in the previous embodiment, the magnetic core 16 is disposed in the annular groove of the substrate 10, and then the conductive patterns 22 are formed on both sides of the substrate, and then the magnetic core 16 in the annular groove is cut, wherein the magnetic core 16, i.e., the insulating material disposed on both sides thereof, is cut by laser cutting. In this solution, the cutting accuracy is required to be high, and it is necessary to ensure that the substrate 10 is kept from being cut through after the cutting of the core 16 is completed.

In the present embodiment, the magnetic core 16 is cut by machining to form the air gap, and then the magnetic core 16 with the air gap is disposed in the annular groove of the substrate 10, and then the subsequent manufacturing process is performed to form the electromagnetic element as described above.

In summary, in the electromagnetic component, the air gap of the magnetic core is provided for the magnetic core of the buried magnetic type electromagnetic component, so that the problem of magnetic saturation of the electromagnetic component in the working process can be avoided, and the stability of the magnetic core itself on the influence of the current can be increased.

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

1. An electromagnetic component, comprising:

a substrate, comprising:

the magnetic core is accommodated in the annular accommodating groove;

2. The electromagnetic component of claim 1, wherein the opening is disposed along a direction in which a center of the core extends toward an outer contour of the core.

3. The electromagnetic component of claim 2, wherein the opening width is equal everywhere in a direction extending along a center of the core toward an outer contour of the core.

4. The electromagnetic component of claim 3, wherein the opening is 0.2-0.5mm wide.

5. The electromagnetic component of claim 1, wherein the magnetic core is a torus or a square torus.

6. The electromagnetic component of claim 1, wherein the electromagnetic component is a transformer, a filter, or an inductor.

7. The electromagnetic component according to claim 1, wherein the substrate is formed of a resin material, and the core is formed of a ferrite core material.