CN114334398A - Multiphase inductor and manufacturing method thereof - Google Patents
Multiphase inductor and manufacturing method thereof Download PDFInfo
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- CN114334398A CN114334398A CN202111625451.0A CN202111625451A CN114334398A CN 114334398 A CN114334398 A CN 114334398A CN 202111625451 A CN202111625451 A CN 202111625451A CN 114334398 A CN114334398 A CN 114334398A
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Abstract
The application discloses a multiphase inductor and a manufacturing method thereof. The multiphase inductor comprises a magnetic body and a plurality of coils, wherein the coils are arranged in the magnetic body at intervals along the second direction in a laminated mode, and two adjacent coils are arranged in a staggered mode. The multi-phase inductor can integrate a plurality of inductors into one multi-phase inductor, the consistency of electric parameters such as inductance L, RDC, coupling coefficient K and the like of the multi-phase inductor is higher, the higher electric performance consistency can maintain signal stability in circuit work, and occupied PCB circuit space can be reduced.
Description
Technical Field
The application relates to the technical field of electromagnetic elements, in particular to a multiphase inductor and a manufacturing method thereof.
Background
The conventional inductor is generally an independent component, so-called single-phase inductor, and a packaged inductor device can only work for a circuit where one driving chip is located. If the Circuit where a plurality of driving chips are located needs to work, a plurality of independent inductors are needed, so that the cost is high, and the occupied Circuit space of a Printed Circuit Board (PCB) is large, which is not beneficial to the miniaturization of electrical components.
Disclosure of Invention
The embodiment of the application provides a multiphase inductor and a manufacturing method thereof, which can integrate a plurality of inductors into one multiphase inductor and reduce the occupied PCB circuit space.
In a first aspect, an embodiment of the present application provides a multiphase inductor, which includes a magnetic body and a plurality of coils, where the plurality of coils are stacked and spaced in the magnetic body along a second direction, and two adjacent coils are disposed in a staggered manner.
Optionally, along an axis in a third direction, the m-th coil and the m + 1-th coil may be symmetrically disposed, and the third direction is perpendicular to the second direction; the m-th coil and the m + 2-th coil may form the original coils end-to-end.
Optionally, along an axis in which the first direction is located, the m-th coil and the m + 2-th coil may be symmetrically disposed, and the first direction, the second direction, and the third direction are perpendicular to each other.
Optionally, the multiphase inductor includes a plurality of pads exposed out of the magnetic body, each coil includes a first end and a second end, the first end is connected to one pad as an input end, and the second end is connected to one pad as an output end; in the first direction, one pad of the m +1 th coil is positioned between two pads of the m-th coil, and the other pad of the m +1 th coil is positioned outside of the two pads of the m-th coil.
Optionally, the size of the pad in the second direction is 0.3mm, and the size in the first direction is 0.4 mm.
Optionally, the magnetic permeability μ of the multiphase inductor is greater than or equal to 10H/m, the multiphase inductor further includes an interlayer disposed in the magnetic body and between two adjacent coils, and further optionally, the interlayer is disposed on two opposite sides of the magnetic body along the second direction.
Optionally, the interlayer has a permeability of μ1And a permeability mu of the interlayer at a temperature of 25 ℃ or higher1＜30％*μ。
In a second aspect, an embodiment of the present application provides a method for manufacturing a multiphase inductor, including the following steps:
printing to form a plurality of coils;
and a plurality of coils are arranged in the magnetic body at intervals along the second direction in a laminated manner, and two adjacent coils are arranged in a staggered manner.
Optionally, printing the plurality of coils comprises: printing to form at least one original coil connected end to end; and cutting the original coil along an axis in which the first direction is located to form at least two coils, wherein the first direction is vertical to the second direction.
Optionally, the method further comprises: printing to form at least two original coils which are respectively arranged on two sides of the shaft along the third direction; and cutting at least two original coils along an axis of the third direction, wherein the first direction, the second direction and the third direction are pairwise vertical.
As above, this application embodiment sets up a plurality of coils in the magnetism body along second direction stromatolite interval, and two adjacent coils dislocation set, forms an inductance through every coil in the magnetism body to can integrate a plurality of inductances into a heterogeneous inductor, integrate the degree height, reduce shared PCB circuit space, be favorable to electrical components's miniaturized design. Further, by adjusting the respective coils, for example, the overlapping area, the coil size, and the like, the multi-phase inductor has high uniformity of electrical parameters such as the inductance L, RDC, the coupling coefficient K, and the like, and the high uniformity of electrical characteristics can maintain the signal stability during the circuit operation.
Drawings
Fig. 1 is a schematic structural diagram of a multi-phase inductor according to an embodiment of the present application;
FIG. 2 is a schematic illustration of a coil printed to form an embodiment of the present application;
FIG. 3 is a schematic illustration of another coil printed to form an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a bonding pad according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a multiphase inductor according to another embodiment of the present application;
fig. 6 is a flow chart illustrating a method of manufacturing a multi-phase inductor according to an embodiment of the present application;
fig. 7 is a flow chart illustrating a method for manufacturing a multiphase inductor according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described below in detail with reference to specific embodiments and accompanying drawings. It should be apparent that the embodiments described below are only some embodiments of the present application, and not all embodiments. In the following embodiments and technical features thereof, all of which are described below may be combined with each other without conflict, and also belong to the technical solutions of the present application.
It should be understood that in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions and simplifying the description of the respective embodiments of the present application, and do not indicate or imply that a device or an element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
Fig. 1 is a schematic structural diagram of a multi-phase inductor according to an embodiment of the present application. As shown in fig. 1, the multiphase inductor 1 includes a magnetic body 10 and a plurality of coils 20. The plurality of coils 20 are stacked and spaced in the second direction y in the magnetic body 10, and two adjacent coils 20 are disposed with a shift.
By stack spacing arrangement is understood: each coil 20 is located on the same plane layer, and a distance greater than zero is provided between two adjacent coils 20 above and below along the second direction y, that is, in the scenario shown in fig. 1, the material of the magnetic body 10 is disposed between two adjacent coils 20 above and below.
By a misaligned arrangement is understood: when viewed in the second direction y, the orthogonal projections between two adjacent coils 20 are not overlapped, and one end (e.g., the left end shown in fig. 1) of the orthogonal projection of one coil 20 falls within the orthogonal projection of the other coil 20, and the other end (e.g., the right end shown in fig. 1) of the orthogonal projection of the one coil 20 falls outside the orthogonal projection of the other coil 20.
As shown in fig. 1, six inductors are formed by six coils 20, so that multiple inductors can be integrated into one multiphase inductor 1, thereby reducing the occupied PCB circuit space and facilitating the miniaturization design of electrical components.
The shape of the multiphase inductor 1 is not limited in the embodiments of the present application, and may be, for example, a cuboid such as a rectangular parallelepiped as shown in fig. 1, and it is to be noted that fig. 1 shows a part of the multiphase inductor 1, specifically, the rectangular parallelepiped multiphase inductor 1 does not show a configuration on the side of the lead electrode (i.e., a pad 21 described later), and in order to visually show the arrangement of each coil 20 in the magnetic body 10, the outer frame of the multiphase inductor 1 is shown as a dotted line, thereby exposing the internal elements of the multiphase inductor 1.
The size of the multi-phase inductor 1 is not limited in the embodiments of the present application. Still taking the cuboid multiphase inductor 1 shown in fig. 1 as an example, the multiphase inductor 1 (i.e. the length in the first direction x shown in fig. 1) has a length of 3.0mm, a height (i.e. the length in the second direction y shown in fig. 1) of 2.2mm and a thickness (i.e. the length in the third direction z shown in fig. 1) of 1.4 mm. The first direction x, the second direction y and the third direction z are perpendicular to each other in pairs and can be regarded as three coordinate axes of a three-dimensional rectangular coordinate system.
The magnetic body 10 may be made of a material having a relatively high magnetic permeability, and for example, the material of the magnetic body 10 includes at least one of ferrite, iron-nickel alloy, amorphous alloy, nanocrystalline alloy, and the like.
It should be understood that the number of coils 20 may be determined according to the actual required adaptability, and the embodiment of the present application is not limited thereto. The 6 coils 20 shown in the figures herein are merely exemplary.
Referring to fig. 1 and 2 together, alternatively, the mth coil 20 and the m +2 th coil 20 may form the original coil 20a connected end to end. What is referred to herein as an original coil 20a that can be formed end-to-end is not the m-th coil 20And the (m + 2) th coil 20 in the magnetic body 10 form an initial coil which is connected end to end, but the two coils 20 can form an initial coil 20a which is connected end to end by changing the arrangement direction. Referring to the left half of fig. 2, an original coil 20a is formed end to end on a substrate by a printing process; along an axis O in a first direction xxThe original coil 20a is cut to obtain the m-th coil 20 and the m + 2-th coil 20. Referring to the right half of fig. 2, the m +1 th coil 20 and the m +3 th coil 20 can be obtained according to the same printing and cutting principle. The two primary coils 20a shown in fig. 2 may be formed using a single printing process, which may be implemented using, but not limited to, a dry printing process.
The substrate may be made of the same material as the magnetic body 10, and the cut substrate and the coil 20 thereon may be directly disposed on the corresponding layer so as to be combined with the magnetic body 10.
Along an axis O of the third direction zzThe mth coil 20 and the m +1 th coil 20 may be symmetrically disposed. The symmetrical arrangement is not the symmetrical arrangement of the m-th coil 20 and the m + 1-th coil 20 in the magnetic body 10, but the two coils 20 can be arranged along the axis O along the third direction z by changing the arrangement directionzAre symmetrically arranged. Referring to FIG. 2, two coils 20 are formed on a substrate by a printing process, wherein the two coils are symmetrically arranged along an axis O of a third direction zzThe substrate is cut to obtain the m-th coil 20 and the m + 1-th coil 20.
Further optionally, an axis O lying along the first direction xxThe mth coil 20 and the m +2 th coil 20 are also symmetrically disposed. Taking m as 1 as an example, the 1 st coil 20 and the 3 rd coil 20 are the same; taking m as 2 as an example, the 2 nd coil 20 and the 4 th coil 20 are the same, and so on.
The m-th coil 20 and the m + 2-th coil 20 are symmetrically arranged structural members, and a plurality of coils 20 can be obtained through one-time printing process. In some scenarios, please refer to FIG. 2, which shows an axis O along a first direction xxCutting the original coil 20a to form twoA coil 20. The plurality of coils 20 are uniformly sized to facilitate uniform RDC (direct current impedance) of the respective phase inductances.
The shape of the coil 20 may be determined according to the actual requirement, and the embodiment of the present application is not limited, and for example, the shape may be as shown in fig. 2 or fig. 3, and 4 identical coils 20 are obtained after cutting.
Referring to fig. 4 and 5, the multi-phase inductor 1 may further include a plurality of bonding pads (Pad)21 exposed from the magnetic body 10, wherein the bonding pads 21 are connected to the coil 20 and may be regarded as lead electrodes of the coil 20 for electrically connecting the coil 20 to an external circuit, and thus the corresponding inductor is electrically connected to the external circuit.
Each coil 20 includes a first terminal connected (e.g., soldered) to one pad 21 as an input terminal and a second terminal connected to one pad 21 as an output terminal. Based on the foregoing arrangement of the plurality of coils 20, the first end and the second end of each coil 20 are oppositely disposed along the first direction x, and along the first direction x, one pad 21 of the m +1 th coil 20 is located between two pads 21 of the m-th coil 20, and the other pad 21 of the m +1 th coil 20 is located outside the two pads 21 of the m-th coil 20. For example, referring to fig. 3, when m is 1, the left pad 21 of the 2 nd coil 20 is located between the two pads 21 of the 1 st coil 20, and the other pad 2121 of the 2 nd coil 20 is located outside the two pads 21 of the 1 st coil 20.
In some scenarios, these pads 21 may be identical, facilitating modular design and manufacturing. The size of each pad 21 may be determined according to the actual required adaptability, and the embodiment of the present application is not limited thereto. For example, when the length, width and thickness of the multi-phase inductor 1 are 3.0mm 2.2mm 1.4mm, respectively, the width (i.e., the dimension along the second direction y) of the pad 21 is 0.3mm, and the length (i.e., the dimension along the first direction x) is 0.4 mm. The material of the bonding pad 21 may be a high-conductivity metal material such as silver, copper, or the like.
In the embodiment of the present application, the coils 20 are arranged in a staggered manner, and the mutual inductance between the inductors can be adjusted by adjusting the overlapping area of two adjacent coils 20 (i.e. the orthographic projection overlapping area of the two coils in the second direction y). For example, in a scenario where the permeability μ < 10H/m (of the magnetic body 10) of the multiphase inductor 1, the inductance L and the coupling coefficient k may both satisfy a predetermined deviation range, for example, a deviation range of ± 10%, by reducing the overlapping area between two coils 20 adjacent to each other.
When the magnetic permeability μ of the multiphase inductor 1 is greater than or equal to 10H/m, the influence between the multiphase inductance values L is large, so that the size of each coil 20 can be adjusted, for example, the size of each coil 20 is increased, so as to reduce the mutual inductance influence between inductances; or, without adjusting the size of each coil 20, as shown in fig. 5, a sandwich layer 40 is disposed in the magnetic body 10, the sandwich layer 40 is located between two adjacent coils 20, and is isolated by the sandwich layer 40, so as to reduce the mutual inductance between inductances, thereby reducing the coupling coefficient k of the multiphase inductor 1, and facilitating the consistency of the multiphase inductor 1 to be stabilized within a predetermined deviation range; further alternatively, the interlayer 40 may be further disposed on two opposite sides of the magnetic body 10 along the second direction y, for example, on both upper and lower end side surfaces of the magnetic body 10 in the orientation shown in fig. 1 and 5, so as to reduce mutual inductance between the inductors.
Magnetic permeability of interlayer 40 is μ1And a magnetic permeability μ at normal temperature (e.g., 25 ℃ C.) or higher1< 30%. mu.m, the material of the interlayer 40 may be at least one of resin, ceramic, glass, and a magnetic material having a curie temperature lower than the normal temperature. In some scenarios, interlayer 40 may be considered a non-magnetic layer, with permeability μ1< 1H/m. Optionally, each edge of the interlayer 40 is exposed to a corresponding side of the multiphase inductor 1.
The following describes the uniformity of inductance L and coupling coefficient K of a multiphase inductor 1 of different permeability, where the inductance L and the coupling coefficient K are both values measured at a frequency of 50 MHz. See tables 1 and 2 below.
TABLE 1
TABLE 2
The inductances L1 through L6 can be regarded as the inductances formed by six coils 20 along the second direction y, as shown in table 2, where K12 is a coupling coefficient of the inductances L1 and L2, K23 is a coupling coefficient of the inductances L2 and L3, K34 is a coupling coefficient of the inductances L3 and L4, K45 is a coupling coefficient of the inductances L4 and L5, and K56 is a coupling coefficient of the inductances L5 and L6.
As shown in table 1, it can be seen from the combination of scheme 1# and scheme 3# that the inductance L of each inductor is reduced by the interlayer 40, and the uniformity of the inductance L of each inductor is high. As is clear from combination of claim 1# and claim 2#, decreasing the permeability μ of the material of magnetic body 10 and increasing the permeability μ of interlayer 40 decreases the inductance L of each inductor, resulting in high uniformity of the inductance L of each inductor.
As shown in table 2, with reference to scheme 1# and scheme 3#, it can be seen that the coupling coefficient K of each inductor can be reduced by providing the interlayer 40, the average value of the coupling coefficients K of each inductor is also low, and it can be reflected that the coupling coefficients K of each inductor are high in consistency. Combining embodiment 1# and embodiment 2#, it is found that the permeability μ of the interlayer 40 is reduced by increasing the permeability μ of the material of the magnetic body 101The coupling coefficient K of each inductor can be reduced, the average value of the coupling coefficient K of each inductor is also lower, and the consistency of the coupling coefficient K of each inductor can be reflected to be higher.
Note that the thickness and permeability μ of interlayer 40 are adjusted according to the thickness and permeability μ1The inductance L of each inductor and the coupling coefficient K of each inductor may be reduced, so that the uniformity of the inductance L of each inductor and the uniformity of the coupling coefficient K are high.
The embodiment of the present application further provides a manufacturing method of a multi-phase inductor, which can be used for manufacturing the aforementioned multi-phase inductor 1. As shown in fig. 6, the manufacturing method includes the following steps S11 and S12.
S11: printing forms a plurality of coils.
S12: and a plurality of coils are arranged in the magnetic body at intervals along the second direction in a laminated manner, and two adjacent coils are arranged in a staggered manner.
Optionally, in step S11, in combination with the left half portion in fig. 2, at least one original coil 20a connected end to end is formed by printing; along an axis O in a first direction xxThe original coil 20a is cut to form at least two coils 20. Further optionally, the printing is performed on the axis O along the third direction z by the above-mentioned one-time printing processzAt least two primary coils 20a on both sides; along an axis O of the third direction zzAt least two original coils 20a are cut to form at least two coils 20.
This method can produce the multi-phase inductor 1 of any one of the foregoing embodiments, and thus can produce the advantageous effects possessed by the multi-phase inductor 1 of the corresponding embodiment. It should be understood that the materials used in the steps, the dimensions obtained, etc. can be referred to the above description and will not be described in detail herein.
It should be understood that the foregoing methods for manufacturing the multi-phase inductor are merely exemplary generalizations, and in a practical scenario, the specific processes of the various steps should be adjusted according to practical needs. For example, as shown in fig. 7, each coil 20 is formed by a dry printing process, then the coils 20 are subjected to the aforementioned offset lamination, and the magnetic body is cut to have a desired size, and then the magnetic body 10 having the plurality of coils 20, i.e., a semi-finished product, is formed by sintering, and further, the pads 21 are formed by, for example, a PVD (Physical Vapor Deposition) process or other processes (e.g., a silver dipping process).
The embodiment of the present application further provides an electronic device, where the electronic device includes the multiphase inductor 1 according to any of the above embodiments, and the multiphase inductor 1 is disposed in a circuit of the electronic device.
Electronic devices may be implemented in various specific forms, for example, electronic products such as smart phones, wearable devices, unmanned planes, electric vehicles, electric cleaning tools, energy storage products, electric vehicles, electric bicycles, electric navigation tools, and the like. It will be understood by those skilled in the art that the configuration according to the embodiments of the present application can be applied to electronic devices of a stationary type, in addition to elements particularly for moving purposes.
Since the electronic device has the multiphase inductor 1 of any one of the foregoing embodiments, the electronic device can produce the advantageous effects that the multiphase inductor 1 of the corresponding embodiment has.
It should be understood that the above-mentioned embodiments are only some examples of the present application, and not intended to limit the scope of the present application, and all structural equivalents made by those skilled in the art using the contents of the present specification and the accompanying drawings are also included in the scope of the present application.
Although the terms "first, second, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
Claims (10)
1. The multiphase inductor is characterized by comprising a magnetic body and a plurality of coils, wherein the coils are arranged in the magnetic body at intervals in a laminated mode along a second direction, and two adjacent coils are arranged in a staggered mode.
2. The multiphase inductor of claim 1,
along an axis of a third direction, the mth coil and the (m + 1) th coil can be symmetrically arranged, and the third direction is vertical to the second direction;
the mth coil and the m +2 th coil may form an original coil connected end to end.
3. The multiphase inductor according to claim 2, wherein said m-th coil and said m +2 th coil are symmetrically disposed along an axis along which a first direction is located, said first direction, said second direction and said third direction being perpendicular to each other.
4. The multiphase inductor of claim 3, wherein said multiphase inductor comprises a plurality of pads exposed from said magnetic body, each of said coils comprising a first end and a second end, said first end connected to one pad as an input and said second end connected to one pad as an output;
one pad of the m +1 th coil is positioned between two pads of the m +1 th coil, and the other pad of the m +1 th coil is positioned outside the two pads of the m +1 th coil along the first direction.
5. The multiphase inductor of claim 4, wherein said pads have a dimension in said second direction of 0.3mm and a dimension in said first direction of 0.4 mm.
6. The multiphase inductor according to any one of claims 1-5, wherein the permeability μ ≧ 10H/m, the multiphase inductor further comprising an interlayer disposed within the magnetic body and between two adjacent coils.
7. The multiphase inductor of claim 6, wherein said interlayer has a permeability of μ1And at a temperature of 25 ℃ or higher, the [ mu ] is1＜30％*μ。
8. A method of manufacturing a multiphase inductor, comprising:
printing to form a plurality of coils;
and the plurality of coils are arranged in the magnetic body at intervals along a second direction in a laminated manner, and two adjacent coils are arranged in a staggered manner.
9. The method of claim 8, wherein the printing to form a plurality of coils comprises:
printing to form at least one original coil connected end to end;
and cutting the original coil along an axis in which a first direction is located to form at least two coils, wherein the first direction is perpendicular to the second direction.
10. The method of claim 9, further comprising:
printing to form at least two original coils which are respectively arranged on two sides of an axis along the third direction;
and cutting at least two original coils along an axis of a third direction, wherein the first direction, the second direction and the third direction are pairwise perpendicular.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302298A (en) * | 2016-03-31 | 2017-10-27 | 台达电子企业管理（上海）有限公司 | Power module with two-way or multiple-channel output voltage |
| CN107369539A (en) * | 2016-04-28 | 2017-11-21 | 株式会社村田制作所 | Compound inductor |
| JP2018186202A (en) * | 2017-04-26 | 2018-11-22 | 株式会社村田製作所 | Composite inductor |
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- 2021-12-28 CN CN202111625451.0A patent/CN114334398A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302298A (en) * | 2016-03-31 | 2017-10-27 | 台达电子企业管理（上海）有限公司 | Power module with two-way or multiple-channel output voltage |
| CN107369539A (en) * | 2016-04-28 | 2017-11-21 | 株式会社村田制作所 | Compound inductor |
| JP2018186202A (en) * | 2017-04-26 | 2018-11-22 | 株式会社村田製作所 | Composite inductor |
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