CN213070861U - Thin film type power inductor - Google Patents
Thin film type power inductor Download PDFInfo
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- CN213070861U CN213070861U CN202022344325.5U CN202022344325U CN213070861U CN 213070861 U CN213070861 U CN 213070861U CN 202022344325 U CN202022344325 U CN 202022344325U CN 213070861 U CN213070861 U CN 213070861U
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Abstract
The utility model discloses a film type power inductor. The thin film type power inductor includes: a magnet, a first port electrode and a second port electrode; when the number of the coils of the film type power inductor is not less than 2, the magnet comprises at least one first substructure, and the first substructure comprises a first upper functional layer, a first upper coil, a first upper adhesive layer, a first insulating layer, a first lower adhesive layer, a first lower coil and a first lower functional layer which are sequentially stacked; the first upper coil and the first lower coil respectively have a first end and a second end; a first end portion of the first upper coil and a first end portion of the first lower coil are exposed to the same surface of the magnet and electrically connected to the first port electrode; the second end of the first upper coil and the second end of the first lower coil are exposed to the same surface of the magnet and electrically connected to the second port electrode. The utility model provides a film type power inductor has simple structure, inductance volume is big, direct current resistance is little, be convenient for advantages such as miniaturization.
Description
Technical Field
The embodiment of the utility model provides a relate to the electronic equipment field, especially relate to a film type power inductor.
Background
An inductor (also called choke, reactor, dynamic reactor) is a component that can convert electrical energy into magnetic energy for storage. Power inductors are generally used in power supply circuits or intelligent electronic devices, and the power inductors may be classified into three types, a stacked type power inductor, a thin film type power inductor, and a wire-wound type power inductor.
According to the development trend of high frequency, miniaturization and large current of intelligent equipment, the size requirement of the power inductor is smaller and smaller, and the rated current requirement is higher and higher. The laminated power inductor has poor saturation resistance and the wound power inductor is difficult to reduce in thickness, so that the thin film power inductor which has low direct current resistance, high self-tuning frequency, can bear large current and is convenient for miniaturization and thinning becomes the development trend of the current power inductor.
The coils of the existing film type power inductor need to be connected in a punching mode or arranged in a staggered mode, so that the structure of the film type power inductor is complex and the film type power inductor is difficult to manufacture.
SUMMERY OF THE UTILITY MODEL
The utility model provides a film type power inductor has advantages such as simple structure, inductance volume is big, direct current resistance is little, be convenient for miniaturization.
In a first aspect, an embodiment of the present invention provides a thin film type power inductor, including: the first port electrode and the second port electrode are respectively arranged on the outer surface of the magnet;
when the number of the coils of the film type power inductor is not less than 2, the magnet comprises at least one first substructure, and the first substructure comprises a first upper functional layer, a first upper coil, a first upper adhesive layer, a first insulating layer, a first lower adhesive layer, a first lower coil and a first lower functional layer which are sequentially stacked;
the first upper coil and the first lower coil respectively have a first end and a second end; a first end portion of the first upper coil and a first end portion of the first lower coil are exposed to the same surface of the magnet and electrically connected to the first port electrode; the second end of the first upper coil and the second end of the first lower coil are exposed to the same surface of the magnet and electrically connected to the second port electrode.
Optionally, when the number of coils of the thin film type power inductor is 2n, the magnet includes n first substructures stacked one on another, where n is a positive integer.
Optionally, when the number of coils of the thin film type power inductor is 2n +1, the magnet includes a second substructure and n first substructures which are stacked, where n is a positive integer;
the second substructure comprises a second functional layer, a second coil, a second glue layer and a second insulating layer which are sequentially stacked;
the second coil has a first end and a second end; the first end part of the second coil and the first end part of the first upper coil, and the first end part of the first lower coil are exposed to the same surface of the magnet and are electrically connected with the first port electrode; the second end portion of the second coil and the second end portion of the first upper coil, and the second end portion of the first lower coil are exposed to the same surface of the magnet and electrically connected to the second port electrode.
Optionally, when the number of coils of the thin film type power inductor is 1, the magnet includes a third substructure;
the third substructure comprises a third upper functional layer, a third coil, a third glue layer, a third insulating layer and a third lower functional layer which are sequentially stacked;
the third coil has a first end and a second end; a first end portion of the third coil is exposed to a surface of the magnet and electrically connected to the first port electrode; the second end of the third coil is exposed to the surface of the magnet and is electrically connected to the second port electrode.
Optionally, when the number of the coils of the thin film type power inductor is not less than 2, the coils are coupled with each other and have the same shape.
Optionally, when the number of coils of the thin film type power inductor is not less than 2, the thin film type power inductor is a common mode power inductor or a differential mode power inductor.
Optionally, when the thin film type power inductor is a common mode power inductor, the coils are designed in the same direction;
when the film type power inductor is a differential mode power inductor, the coils adopt a reverse design between each two coils.
Optionally, the functional layer of the thin film type power inductor is made of a magnetic material.
Optionally, the magnetic material is a soft magnetic alloy.
Optionally, the coil of the thin film type power inductor is made of metal or metal alloy.
The utility model provides a film type power inductor, include: the first port electrode and the second port electrode are respectively arranged on the outer surface of the magnet; when the number of the coils of the film type power inductor is not less than 2, the magnet comprises at least one first substructure, and the first substructure comprises a first upper functional layer, a first upper coil, a first upper adhesive layer, a first insulating layer, a first lower adhesive layer, a first lower coil and a first lower functional layer which are sequentially stacked; the first upper coil and the first lower coil respectively have a first end and a second end; a first end portion of the first upper coil and a first end portion of the first lower coil are exposed to the same surface of the magnet and electrically connected to the first port electrode; the second end of the first upper coil and the second end of the first lower coil are exposed to the same surface of the magnet and electrically connected to the second port electrode. Because two ends of the coil of the film type power inductor are directly exposed to the surface of the magnet and are respectively and electrically connected with the first port electrode and the second port electrode, the rapid leading-out of the electrodes is realized; in addition, the coils do not need to be connected in a punching mode, and a through hole layer is omitted, so that the miniaturization is facilitated. Compare with current film type power inductor, the utility model provides a film type power inductor make full use of three-dimensional multilayer space, showing and having reduced the required volume of component, have advantages such as simple structure, inductance volume are big, direct current resistance is little, be convenient for the miniaturization.
Drawings
Fig. 1 is a schematic perspective view of a thin film type power inductor according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a first substructure according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a second substructure according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a third substructure according to an embodiment of the present invention;
fig. 5 is a perspective view of a three-dimensional structure of a magnet with a coil number of 2 according to an embodiment of the present invention;
fig. 6 is a perspective view of a three-dimensional structure of a film type power inductor with a number of turns of 2 according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional structure diagram of a magnet with a coil number of 4 according to an embodiment of the present invention;
fig. 8 is a schematic cross-sectional structure diagram of a magnet with a coil number of 3 according to an embodiment of the present invention;
fig. 9 is a perspective view of a three-dimensional structure of a film type power inductor with a number of turns of 3 according to an embodiment of the present invention;
fig. 10 is a schematic cross-sectional view of a magnet with a coil number of 5 according to an embodiment of the present invention
Fig. 11 is a perspective view of a three-dimensional structure of a film type power inductor with a coil number of 1 according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Also, the drawings and description of the embodiments are to be regarded as illustrative in nature, and not as restrictive. Like reference numerals refer to like elements throughout the specification. In addition, the size of some of the structures, regions, etc. may be exaggerated in the drawings for understanding and ease of description. Additionally, unless explicitly described to the contrary, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.
In the embodiments of the present invention, the various components are described by "first", "second", and the like, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Also, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
While certain embodiments may be practiced differently, the specific process sequence may be performed differently than described. For example, two processes described consecutively may be performed at substantially the same time or in an order reverse to that described.
Hereinafter, the thin film type power inductor and its technical effects will be described in detail.
Fig. 1 shows a schematic perspective view of a thin film type power inductor according to an embodiment of the present invention. As shown in fig. 1, the thin film type power inductor includes: a magnet 10, a first port electrode 20, and a second port electrode 30, the first port electrode 20 and the second port electrode 30 being respectively disposed on an outer surface of the magnet 10.
IN one embodiment, the first port electrode 20 is an input electrode IN of the thin film type power inductor, and the second port electrode 30 is an output electrode OUT of the thin film type power inductor; alternatively, the first port electrode 20 is an output electrode OUT of the thin film type power inductor, and the second port electrode 30 is an input electrode IN of the thin film type power inductor.
The first and second port electrodes 20 and 30 may be formed by coating silver paste at the designated port positions of the magnet 10, curing at a low temperature, and then plating.
The number of coils (also called inductor coils) included in the magnet 10 may be designed according to the inductance of the thin film type power inductor. Specifically, the number of coils may be any positive integer.
To describe the structure of the magnet 10 in detail for different numbers of coils, first, second, and third sub-structures will be described.
Fig. 2 shows a schematic cross-sectional structure diagram of a first substructure provided in an embodiment of the present invention. As shown in fig. 2, the first substructure includes a first upper functional layer a1, a first upper coil a2, a first upper glue layer A3, a first insulating layer a4, a first lower glue layer a5, a first lower coil a6, and a first lower functional layer a7, which are sequentially stacked.
Fig. 3 shows a schematic cross-sectional structure diagram of a second substructure provided in an embodiment of the present invention. As shown in fig. 3, the second substructure includes a second functional layer B1, a second coil B2, a second glue layer B3, and a second insulating layer B4, which are sequentially stacked.
Fig. 4 shows a schematic cross-sectional structure diagram of a third substructure provided in an embodiment of the present invention. As shown in fig. 4, the third substructure includes a third upper functional layer C1, a third coil C2, a third glue layer C3, a third insulating layer C4, and a third lower functional layer C5, which are sequentially stacked.
As can be seen from fig. 2 to 4, the functional layers may be: a first upper functional layer a1, a first lower functional layer a7, a second functional layer B1, a third upper functional layer C1, and a third lower functional layer C5. The functional layer may be made of the same material and the same manufacturing process, and the functional layer is only used for distinguishing different positions of the functional layer. Similarly, the coil may be: a first upper coil a2, a first lower coil a6, a second coil B2, and a third coil C2; the glue layer can be: the first upper glue layer A3, the first lower glue layer A5, the second glue layer B3 and the third glue layer C3; the insulating layer may be: a first insulating layer a4, a second insulating layer B4, and a third insulating layer C4.
The functional layer is used for covering the coil and improving the inductance of the thin film type power inductor. The self-inductance of the coil generates inductance. The adhesive layer bonds the film layers on both sides of the adhesive layer together. The insulating layer is used for ensuring the insulation between the coils.
In a first possible implementation, when the number of coils of the thin-film type power inductor is 2n (n is a positive integer), the magnet 10 includes n first substructures arranged in a stack.
Exemplarily, when n is 1 (i.e., the number of coils of the thin film type power inductor is 2), fig. 5 shows a perspective view of a three-dimensional structure of a magnet with 2 turns provided by an embodiment of the present invention; fig. 6 is a perspective view illustrating a three-dimensional structure of a film type power inductor with a number of turns of 2 according to an embodiment of the present invention. As shown in fig. 5 and 6, the first upper coil a2 and the first lower coil a6 have first and second ends, respectively; the first end portion 111 of the first upper coil a2 and the first end portion 121 of the first lower coil a6 are exposed to the same surface of the magnet and electrically connected to the first port electrode 20; the second end 112 of the first upper coil a2 and the second end 122 of the first lower coil a6 are exposed to the same surface of the magnet and are electrically connected with the second port electrode 30.
As another example, when n is 2 (that is, the number of coils of the thin film type power inductor is 4), fig. 7 shows a schematic cross-sectional structure diagram of a magnet with a number of coils of 4 according to an embodiment of the present invention. As shown in fig. 7, 2 first substructures are arranged in a stack. In one embodiment, the adjacent first upper functional layer a1 and first lower functional layer a7 may be formed in one film and in the same process.
In a second possible implementation, when the number of coils of the thin film type power inductor is 2n +1(n is a positive integer), the magnet 10 includes one second substructure and n first substructures that are stacked.
For example, when n is equal to 1 (i.e. the number of coils of the thin film type power inductor is 3), fig. 8 shows a schematic cross-sectional structure diagram of a magnet with a number of coils of 3 according to an embodiment of the present invention; fig. 9 is a perspective view illustrating a three-dimensional structure of a film type power inductor with a winding number of 3 according to an embodiment of the present invention. As shown in fig. 8 and 9, the magnet includes a second substructure and a first substructure arranged in a stack
The first upper coil a2, the first lower coil a6, and the second coil B2 have first and second ends, respectively; the first end portion 111 of the first upper coil a2, the first end portion 121 of the first lower coil a6, and the first end portion 131 of the second coil B2 are exposed to the same surface of the magnet and electrically connected to the first port electrode 20; the second end portion 112 of the first upper coil a2, the second end portion 122 of the first lower coil a6, and the second end portion 132 of the second coil B2 are exposed to the same surface of the magnet and are electrically connected to the second port electrode 30.
As another example, when n is 2 (that is, the number of coils of the thin film type power inductor is 5), fig. 10 shows a schematic cross-sectional structure diagram of a magnet with a number of coils of 5 according to an embodiment of the present invention. As shown in fig. 10, 1 second substructure and 2 first substructures are stacked. In one embodiment, the adjacent first upper functional layer a1 and first lower functional layer a7 may be formed in one film and in the same process.
In a third possible implementation, when the number of coils of the thin film type power inductor is 1, the magnet 10 includes a third substructure. Fig. 11 is a perspective view illustrating a three-dimensional structure of a film type power inductor with a number of turns of 1 according to an embodiment of the present invention. As shown in fig. 11, third coil C2 has first end 111 and second end 121; the first end portion 111 of the third coil C2 is exposed to the surface of the magnet and electrically connected to the first port electrode 20; the second end portion 121 of the third coil C2 is exposed to the surface of the magnet and is electrically connected to the second port electrode 30.
Optionally, when the number of the coils of the thin film type power inductor is not less than 2, the coils are coupled with each other and have the same shape. Therefore, the inductance of the thin film type power inductor can be improved.
Optionally, when the number of coils of the thin film type power inductor is not less than 2, the thin film type power inductor is a common mode power inductor or a differential mode power inductor.
Optionally, when the thin film type power inductor is a common mode power inductor, the coils are designed in the same direction, so that the direct current resistance is reduced, and the inductance is increased;
when the film type power inductor is a differential mode power inductor, the coils adopt a reverse design between every two coils, so that the direct current resistance is increased, and the inductance is reduced.
Optionally, the functional layer of the thin film type power inductor is made of a magnetic material. The magnetic material from which the functional layer is made may be subjected to an insulating treatment.
Optionally, the magnetic material is a soft magnetic alloy. Soft magnetic alloys (soft magnetic materials) are magnetic materials with high saturation magnetic flux density, low coercivity and high magnetic permeability.
Optionally, the coil of the thin film type power inductor is made of metal or metal alloy. Specifically, the metal or the metal alloy may have a low resistivity.
Optionally, the size of the thin film type power inductor provided by the embodiment of the present invention can be set according to actual requirements, for example, the size of the thin film type power inductor can be 1.2mm × 1.0mm × 0.3mm, the line width is 100 μm, and the line thickness is 30 μm.
The utility model provides a film type power inductor, include: the first port electrode and the second port electrode are respectively arranged on the outer surface of the magnet; when the number of the coils of the film type power inductor is not less than 2, the magnet comprises at least one first substructure, and the first substructure comprises a first upper functional layer, a first upper coil, a first upper adhesive layer, a first insulating layer, a first lower adhesive layer, a first lower coil and a first lower functional layer which are sequentially stacked; the first upper coil and the first lower coil respectively have a first end and a second end; a first end portion of the first upper coil and a first end portion of the first lower coil are exposed to the same surface of the magnet and electrically connected to the first port electrode; the second end of the first upper coil and the second end of the first lower coil are exposed to the same surface of the magnet and electrically connected to the second port electrode. Because two ends of the coil of the film type power inductor are directly exposed to the surface of the magnet and are respectively and electrically connected with the first port electrode and the second port electrode, the rapid leading-out of the electrodes is realized; in addition, the coils do not need to be connected in a punching mode, do not have a through hole layer and do not need to be connected in any electrical mode, and further miniaturization is facilitated. Compare with current film type power inductor, the utility model provides a film type power inductor make full use of three-dimensional multilayer space, showing and having reduced the required volume of component, have advantages such as simple structure, inductance volume are big, direct current resistance is little, be convenient for the miniaturization.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A thin film type power inductor, comprising: a magnet, a first port electrode and a second port electrode, the first port electrode and the second port electrode being respectively disposed on an outer surface of the magnet;
when the number of the coils of the thin film type power inductor is not less than 2, the magnet comprises at least one first substructure, and the first substructure comprises a first upper functional layer, a first upper coil, a first upper adhesive layer, a first insulating layer, a first lower adhesive layer, a first lower coil and a first lower functional layer which are sequentially stacked;
the first upper coil and the first lower coil have a first end and a second end, respectively; a first end portion of the first upper coil and a first end portion of the first lower coil are exposed to the same surface of the magnet and electrically connected with the first port electrode; the second end of the first upper coil and the second end of the first lower coil are exposed to the same surface of the magnet and electrically connected with the second port electrode.
2. The thin film type power inductor according to claim 1, wherein when the number of coils of the thin film type power inductor is 2n, the magnet includes n number of the first substructures arranged in a stack, and n is a positive integer.
3. The thin film type power inductor according to claim 1, wherein when the number of coils of the thin film type power inductor is 2n +1, the magnet includes one second substructure and n first substructures arranged in a stack, n being a positive integer;
the second substructure comprises a second functional layer, a second coil, a second adhesive layer and a second insulating layer which are sequentially stacked;
the second coil has a first end and a second end; a first end portion of the second coil and a first end portion of the first upper coil, a first end portion of the first lower coil being exposed to the same surface of the magnet and being electrically connected with the first port electrode; the second end portion of the second coil and the second end portion of the first upper coil, the second end portion of the first lower coil are exposed to the same surface of the magnet and electrically connected with the second port electrode.
4. The thin film type power inductor according to claim 1, wherein when the number of coils of the thin film type power inductor is 1, the magnet includes a third substructure;
the third substructure comprises a third upper functional layer, a third coil, a third glue layer, a third insulating layer and a third lower functional layer which are sequentially stacked;
the third coil has a first end and a second end; a first end portion of the third coil is exposed to a surface of the magnet and electrically connected with the first port electrode; a second end of the third coil is exposed to a surface of the magnet and is electrically connected with the second port electrode.
5. The thin film type power inductor according to claim 1, wherein when the number of the coils of the thin film type power inductor is not less than 2, the coils are coupled with each other and have a uniform shape.
6. The thin film type power inductor according to claim 1, wherein when the number of coils of the thin film type power inductor is not less than 2, the thin film type power inductor is a common mode power inductor or a differential mode power inductor.
7. Thin film type power inductor according to claim 6,
when the thin film type power inductor is a common mode power inductor, the coils are designed in the same direction;
when the film type power inductor is a differential mode power inductor, the coils adopt a reverse design between every two coils.
8. The thin film type power inductor according to claim 1, wherein the functional layer of the thin film type power inductor is made of a magnetic material.
9. The thin film type power inductor as claimed in claim 8, wherein the magnetic material is a soft magnetic alloy.
10. The thin film type power inductor as claimed in claim 1, wherein the coil of the thin film type power inductor is made of metal or metal alloy.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242421A (en) * | 2021-12-28 | 2022-03-25 | 横店集团东磁股份有限公司 | Thin film inductor and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114242421A (en) * | 2021-12-28 | 2022-03-25 | 横店集团东磁股份有限公司 | Thin film inductor and manufacturing method thereof |
| CN114242421B (en) * | 2021-12-28 | 2023-07-21 | 横店集团东磁股份有限公司 | Thin film inductor and manufacturing method |
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