CN111430132A - Inductor and production process - Google Patents
Inductor and production process Download PDFInfo
- Publication number
- CN111430132A CN111430132A CN202010350925.4A CN202010350925A CN111430132A CN 111430132 A CN111430132 A CN 111430132A CN 202010350925 A CN202010350925 A CN 202010350925A CN 111430132 A CN111430132 A CN 111430132A
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- inductor
- main body
- shaped
- inductance
- magnetic powder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
- H01F41/076—Forming taps or terminals while winding, e.g. by wrapping or soldering the wire onto pins, or by directly forming terminals from the wire
Abstract
The invention provides an inductor, which comprises an inductor main body and an insulating magnetic powder block; the inductor comprises an inductor main body and a plurality of inductor pins, wherein the inductor main body comprises a U-shaped inductor wire main body and two inductor pins which are integrally formed, the U-shaped inductor wire main body comprises a horizontal part and two bending parts, each inductor pin and the horizontal part extend in the same direction and are connected with one bending part, and the length of each bending part is less than half of the length of the horizontal part; the U-shaped inductance line main body is wrapped by the insulating magnetic powder blocks and the two inductance pins are exposed. The invention also provides a production process of the inductor. The pins of the inductance wire are exposed on the surface of the insulating magnetic powder block and do not protrude, and the occupied area of the inductance on the circuit board is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronic components, in particular to an inductor and a production process.
Background
With the development of electronic technology, various electronic components are widely applied, and a common integrated inductor is divided into two types, namely an inductor in a pin bending process, wherein an inductance wire or a coil is wrapped inside an insulating magnetic powder block, electrode pins connected with the inductance wire in a spot welding mode extend out of the left side and the right side of the insulating magnetic powder block and are positioned on the surface of the insulating magnetic powder block through bending forming. The side surface of the common inductor is provided with an electrode mounting surface, so that the tin of the electrodes on two sides expands outwards when a circuit board is soldered, the length and width sizes are lengthened, and the soldering area is increased, namely the effective utilization volume of the product is reduced. The other type is a plating type integral inductor, and after the inductance wire is led out from two ends of the magnet, the electrode treatment of copper plating 31, silver end 32, nickel plating 33 and tin plating 34 is carried out.
The side surface of the electroplated electrode inductor is also an electroplated metal surface with electrodes, so that the tin of the electrodes on two sides expands outwards when the circuit board is subjected to tin soldering, the length and width dimensions are lengthened, the tin soldering area is increased, and the effective utilization volume of the product is reduced.
Disclosure of Invention
The invention provides an inductor and a production process thereof, which aim to reduce the volume of a circuit board occupied by the inductor.
In a first aspect, the present invention provides an inductor, including an inductor main body and an insulating magnetic powder block;
the inductor comprises an inductor main body and a plurality of inductor pins, wherein the inductor main body comprises a U-shaped inductor wire main body and two inductor pins which are integrally formed, the U-shaped inductor wire main body comprises a horizontal part and two bending parts, each inductor pin and the horizontal part extend in the same direction and are connected with one bending part, and the length of each bending part is less than half of the length of the horizontal part;
the U-shaped inductance line main body is wrapped by the insulating magnetic powder blocks and the two inductance pins are exposed.
Further, the surface of the insulating magnetic powder block is plated with an insulating coating.
Further, the insulating coating is a high-temperature-resistant inorganic coating or an organic resin.
Furthermore, the U-shaped inductance line main body is made of copper or silver.
Further, the U-shaped inductance line main body is a coil-shaped conducting wire.
Further, the U-shaped inductance line main body is flat, and the thickness of the U-shaped inductance line main body is larger than or equal to 0.03 millimeter.
Further, the U-shaped inductance line main body is circular, and the diameter is larger than or equal to 0.06 millimeter.
Further, the end of each inductor pin includes an inner bend toward the horizontal portion.
In a second aspect, the present invention provides a process for manufacturing an inductor, which is performed by a pressing mold, wherein the pressing mold includes an upper pressing surface, a lower pressing surface, and a pressing wall, and the upper pressing surface, the lower pressing surface, and the pressing wall surround a mold cavity, and the process includes:
placing a U-shaped inductance wire main body on the pressing surface, wherein the U-shaped inductance wire main body comprises a horizontal part and two bent parts which are integrally formed, the length of each bent part is less than half of the length of the horizontal part, the two bent parts extend in the same direction, the included angle between each bent part and the horizontal part is less than ninety degrees, and the free ends of the two bent parts are used as two supporting points of the U-shaped inductance wire main body which is placed on the pressing surface;
filling insulating magnetic powder into the cavity, wherein the horizontal part of the inductance line is wrapped by the insulating magnetic powder;
the upper pressing surface and the lower pressing surface of the pressing machine die extrude the insulating magnetic powder and the U-shaped inductance wire main body, so that the free ends of the two bending parts slide and bend along the lower pressing surface to form two inductance pins extending in the same direction as the horizontal part, and the two inductance pins are exposed outside the extruded insulating magnetic powder.
Further, insulating magnetic powder has predetermined compression ratio, have between kink and the horizontal part predetermined numerical value the contained angle, then will the inductance main part is vertical to be placed before in the mould cavity, still include:
and determining the length proportion of the horizontal part and the bent part based on the preset compression ratio and the included angle of the preset numerical value.
Further, each of the folds includes an inner fold extending along the depressed face.
The invention discloses an inductor and a production process of the inductor, which enable pins of an inductor wire to be exposed on the surface of an insulating magnetic powder block and not to protrude, and enable the occupied area of the inductor on a circuit board to be reduced.
Drawings
Fig. 1 is a schematic diagram of an inductor structure according to a first embodiment of the present invention.
Fig. 2 is a partially enlarged view of an inductor structure according to a first embodiment of the invention.
Fig. 3 is a bottom view of an inductor manufactured using conventional processes in accordance with a first embodiment of the present invention.
Fig. 4 is a bottom view of an inductor according to the present invention in an embodiment of the present invention.
Fig. 5 is a diagram illustrating an initial state of the inductor wire placed in the die of the pressing machine according to the second embodiment of the present invention.
Fig. 6 is a schematic diagram of an inductor structure before extrusion according to a second embodiment of the present invention.
Fig. 7 is a schematic structural view of filling magnetic powder into a press mold in the second embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a second intermediate press mold according to the embodiment of the present invention.
FIG. 9 is a flow chart of a second embodiment of the present invention.
Fig. 10 is a flow chart of a manufacturing process of a second alternative embodiment of the present invention.
The figures and reference numerals are as follows:
U-shaped inductance line main body 11
The first bending part 112
The second bending part 113
First inner bend 121
Second inner bend 131
Insulating magnetic powder block 2
Press die 3
Upper pressing surface 31
Mold cavity 34
Insulating magnetic powder 4
Angle α
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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
The embodiment provides an inductor which is used for assembling and manufacturing a computer mainboard, a display card, a server, a routing switch, a mobile phone and the like. The units mm mentioned in the present examples and in the following examples refer to millimeters, mm2Mean square millimeter, mm3Refers to cubic millimeters.
As shown in fig. 1, the inductor of this embodiment includes an inductor main body 1 and an insulating magnetic powder block 2, where the inductor main body 1 includes a U-shaped inductor line main body 11 and two inductor pins, which are a first inductor pin 12 and a second inductor pin 13, respectively, that are integrally formed.
The U-shaped inductor line body 11 includes a horizontal portion 111 and two bending portions, the two bending portions are a first bending portion 112 and a second bending portion 113 respectively, the first inductor pin 12 and the horizontal portion 111 extend in the same direction and are connected to the first bending portion 112, the second inductor pin 13 and the horizontal portion 111 extend in the same direction and are connected to the second bending portion 113, and the lengths of the first bending portion 112 and the second bending portion 113 are both less than one-half of the length of the horizontal portion 111; as shown in fig. 2, wherein the end portions of the first inductor lead 12 and the second inductor lead 13 each include a first inner bend 121 and a second inner bend 131 facing the horizontal portion 111, in an alternative embodiment as shown in fig. 2, the first inner bend and the second inner bend may also be omitted.
In this step, the first inductance pin 12 and the second inductance pin 13 are metal end points at two ends of the U-shaped inductance line main body 11, and are integrally formed with the U-shaped inductance line main body 11, so that the original process of spot welding connection of the electrode pin and the metal coil is avoided, the production time is saved, the resistance is reduced, and meanwhile, potential safety hazards such as insufficient soldering, missing soldering, poor contact and the like are eliminated.
As shown in fig. 1, the insulating magnetic powder block 2 wraps the U-shaped inductance line body 11 and exposes the first inductance pin 12 and the second inductance pin 13. The insulating magnetic powder block 2 is a closed square block formed by carrying out insulating treatment on alloy or carbon-based powder in a die casting mode. The structure ensures that the volume of the bottom surface of the insulating magnetic powder block 2 is the volume of the inductor welded on the PCB. In an alternative embodiment, the surface of the insulating magnetic powder block 2 is plated with an insulating coating 3, and the insulating coating is any one of high-temperature resistant inorganic coating or organic resin.
The structure of the inductor can be applied to any one of circular, oval, square or special-shaped structures, the inductor is exemplarily a square inductor, the length m of the insulating magnetic powder block of the main body part of the implementation is 2mm, the width n of the insulating magnetic powder block is 1.2mm, and the height h of the insulating magnetic powder block is 1mm, and the area S occupied by the inductor on the PCB is determined by the length ×.
The inductance wire is a flat wire, the thickness d1 is 0.1mm, the thickness d2 of the insulating coating is 0.1mm, and the spreading d3 of the single-side tin after soldering is 0.3 mm.
Fig. 3 shows a bottom view of an inductor manufactured using conventional processes, with the following parameters:
the dimension S1 on the PCB is × length (m +2d2+2d3) × (n +2d2) (2+0.2+0.6) mm × (1.2+0.2) mm (3.92 mm)2。
Fig. 4 is a bottom view of the inductor according to this embodiment, and the parameters are as follows:
fig. 4 is a bottom view of the inductor according to this embodiment, and the parameters are as follows:
the dimension S2 of the PCB is × length (m +2d2) × (n +2d2) (2+0.2) ×
(1.2+0.2)＝3.08mm2。
Therefore, the area S2 occupied by the inductor on the PCB is smaller than that occupied by the inductor on the PCB in the traditional process S1.
Optionally, the U-shaped inductance line body 11 is made of any one of copper, silver, or iron-nickel alloy.
In an alternative embodiment, the U-shaped inductor main body 11 is a straight conductor. Illustratively, the U-shaped inductance line main body 11 is flat, and optionally, has a thickness greater than or equal to 0.03 mm. Illustratively, the U-shaped inductor main body 11 is circular, and optionally has a diameter greater than or equal to 0.06 mm.
In an alternative embodiment, the U-shaped inductance wire body 11 is a coil-shaped wire, and the winding shape of the coil-shaped wire is linear or nonlinear.
This embodiment is through inlaying the inductance line in the magnetism powder piece inside, and the inductance pin inlays in magnetism powder piece surface, and the area that makes the inductance of equidimension account for the circuit board is littleer.
Example two
The embodiment provides a production process of an inductor. This embodiment is performed by a press die 3, as shown in fig. 5, the press die 3 comprising an upper pressing surface 31, a lower pressing surface 32 and a pressing wall 33, the upper pressing surface 31, the lower pressing surface 32 and the pressing wall 33 enclosing a die cavity 34. As shown in fig. 9, the method comprises the following steps:
s101, placing the U-shaped inductance line main body on the pressing surface, wherein the U-shaped inductance line main body comprises a horizontal portion and two bending portions which are integrally formed, the length of each bending portion is smaller than half of the length of the horizontal portion, the two bending portions extend in the same direction, the included angle between each bending portion and the horizontal portion is smaller than ninety degrees, and the free ends of the two bending portions serve as two supporting points of the U-shaped inductance line main body which is placed on the pressing surface.
In this embodiment, as shown in fig. 6, the inductance line structure before being pressed is shown, specifically, the U-shaped inductance line main body includes a horizontal portion 111 and two bending portions, the two bending portions are a first bending portion 112 and a second bending portion 113, the lengths of the first bending portion 112 and the second bending portion 113 are both smaller than half of the length of the horizontal portion, the first bending portion 112 and the second bending portion 113 extend in the same direction, an included angle α between each bending portion and the horizontal portion 111 is smaller than ninety degrees, and free ends of the two bending portions serve as two supporting points at which the U-shaped inductance line main body is placed on the pressing surface.
In this step, the U-shaped inductor main body further includes a first inner bend 121 and a second inner bend 131, the included angle α is less than ninety degrees, and the inner bends function to facilitate inward folding of the two bent supporting points of the U-shaped inductor main body during pressing.
S102, filling insulating magnetic powder into the cavity, and wrapping the horizontal part of the inductance wire by the insulating magnetic powder.
As shown in fig. 7, the insulating magnetic powder 4 is filled in the cavity 33, and in order to avoid the exposure of the inductance wire, the insulating magnetic powder 4 needs to be submerged over the highest point of the inductance wire.
S103, extruding the insulating magnetic powder and the U-shaped inductance wire main body by the upper pressing surface and the lower pressing surface of the pressing machine die, so that the free ends of the two bending parts slide and bend oppositely along the lower pressing surface to form two inductance pins extending in the same direction as the horizontal part, and exposing the two inductance pins to the outside of the extruded insulating magnetic powder.
As shown in fig. 8, the insulated magnetic powder 4 is compressed to form the insulated magnetic powder block 2, and the inductor structure after fabrication is as shown in fig. 1, which is not described herein again. In this step, the first inner bend 121 and the second inner bend 131 function to reduce resistance of the first bent portion 112 and the second bent portion 113 of the main body of the inductor wire during the compression process, so that the bent portions are kept parallel to the horizontal portion 111 after the compression process, and the bent portions are not bent due to excessive longitudinal pressure.
In the compression process, since the insulating magnetic powder 4 is injected between the bent portion and the horizontal portion 111, after the compression is finished, the first bent portion 112 and the second bent portion 113 can be kept out of contact with the horizontal portion 111, thereby avoiding short circuit.
In an alternative embodiment, the method for calculating the length ratio of the horizontal portion 111 and the first bent portion 112 and the second bent portion 113 in the U-shaped inductance wire main body, where the length ratio of the bent portion to the horizontal portion 111 is determined by the compression ratio of the insulated magnetic powder 4 and the included angle α, before the step S101, as shown in fig. 10, further includes:
s1041, determining the length proportion of the horizontal part and the bending part based on the preset compression ratio and the included angle of the preset numerical value.
And S1042, bending the inductance line based on the length proportion, and generating the U-shaped inductance line main body comprising the horizontal part and the two bending parts.
The manufacturing scheme of this embodiment is embedded in inductance line main part inside the insulating magnetic powder, the inductance pin inlays in the magnetic powder piece surface at the manufacture process, makes the inductance of equidimension occupy the area of circuit board littleer.
The product can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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 by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. An inductor is characterized by comprising an inductor main body and an insulating magnetic powder block;
the inductor comprises an inductor main body and a plurality of inductor pins, wherein the inductor main body comprises a U-shaped inductor wire main body and two inductor pins which are integrally formed, the U-shaped inductor wire main body comprises a horizontal part and two bending parts, each inductor pin and the horizontal part extend in the same direction and are connected with one bending part, and the length of each bending part is less than half of the length of the horizontal part;
the U-shaped inductance line main body is wrapped by the insulating magnetic powder blocks and the two inductance pins are exposed.
2. An inductor according to claim 1, wherein the surface of the insulating magnetic powder block is coated with an insulating coating.
3. An inductor according to claim 3, wherein said insulating coating is a high temperature resistant inorganic coating or an organic resin.
4. The inductor as claimed in claim 1, wherein the U-shaped inductor wire body is made of copper or silver.
5. An inductor according to claim 1, wherein the U-shaped inductor main body is a coil-shaped conductor.
6. The inductor as claimed in claim 5, wherein the U-shaped inductor main body is flat and has a thickness greater than or equal to 0.03 mm.
7. The inductor as claimed in claim 1, wherein the U-shaped inductor wire body is circular and has a diameter greater than or equal to 0.06 mm.
8. An inductor according to claim 1, wherein the end of each inductor lead includes an inward bend towards the horizontal portion.
9. A production process of an inductor is executed through a press die, the press die comprises an upper pressing surface, a lower pressing surface and a pressing wall, and a die cavity is surrounded by the upper pressing surface, the lower pressing surface and the pressing wall, and the production process is characterized by comprising the following steps of:
placing a U-shaped inductance wire main body on the pressing surface, wherein the U-shaped inductance wire main body comprises a horizontal part and two bent parts which are integrally formed, the length of each bent part is less than half of the length of the horizontal part, the two bent parts extend in the same direction, the included angle between each bent part and the horizontal part is less than ninety degrees, and the free ends of the two bent parts are used as two supporting points of the U-shaped inductance wire main body which is placed on the pressing surface;
filling insulating magnetic powder into the cavity, wherein the horizontal part of the inductance line is wrapped by the insulating magnetic powder;
the upper pressing surface and the lower pressing surface of the pressing machine die extrude the insulating magnetic powder and the U-shaped inductance wire main body, so that the free ends of the two bending parts slide and bend along the lower pressing surface to form two inductance pins extending in the same direction as the horizontal part, and the two inductance pins are exposed outside the extruded insulating magnetic powder.
10. The process for manufacturing an inductor according to claim 9, wherein the insulating magnetic powder has a predetermined compression ratio, and the included angle between the bent portion and the horizontal portion has a predetermined value, so that before the inductor body is vertically placed in the mold cavity, the process further comprises:
determining the length proportion of the horizontal part and the bent part based on the preset compression ratio and the included angle of the preset numerical value;
and bending the inductance line based on the length proportion to generate the U-shaped inductance line main body comprising a horizontal part and two bending parts.
11. The process for manufacturing an inductor according to claim 9, wherein each of the bent portions comprises an inner bend extending along the pressing surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010350925.4A CN111430132A (en) | 2020-04-28 | 2020-04-28 | Inductor and production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010350925.4A CN111430132A (en) | 2020-04-28 | 2020-04-28 | Inductor and production process |
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| CN111430132A true CN111430132A (en) | 2020-07-17 |
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| CN202010350925.4A Pending CN111430132A (en) | 2020-04-28 | 2020-04-28 | Inductor and production process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000164431A (en) * | 1998-11-25 | 2000-06-16 | Tokin Corp | Inductor |
| CN103700478A (en) * | 2013-12-14 | 2014-04-02 | 和瑞电子(中山)有限公司 | Manufacturing method of miniaturized inductor |
| CN206225191U (en) * | 2016-10-28 | 2017-06-06 | 深圳市海光电子有限公司 | A kind of two-way weak coupling heavy-current inductor |
| CN110942890A (en) * | 2019-12-06 | 2020-03-31 | 三积瑞科技（苏州）有限公司 | Integrated inductor |
-
2020
- 2020-04-28 CN CN202010350925.4A patent/CN111430132A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000164431A (en) * | 1998-11-25 | 2000-06-16 | Tokin Corp | Inductor |
| CN103700478A (en) * | 2013-12-14 | 2014-04-02 | 和瑞电子(中山)有限公司 | Manufacturing method of miniaturized inductor |
| CN206225191U (en) * | 2016-10-28 | 2017-06-06 | 深圳市海光电子有限公司 | A kind of two-way weak coupling heavy-current inductor |
| CN110942890A (en) * | 2019-12-06 | 2020-03-31 | 三积瑞科技（苏州）有限公司 | Integrated inductor |
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Application publication date: 20200717 |