CN107316736A - SMD power inductor and its manufacture method - Google Patents
SMD power inductor and its manufacture method Download PDFInfo
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- CN107316736A CN107316736A CN201710657552.3A CN201710657552A CN107316736A CN 107316736 A CN107316736 A CN 107316736A CN 201710657552 A CN201710657552 A CN 201710657552A CN 107316736 A CN107316736 A CN 107316736A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000004020 conductor Substances 0.000 claims abstract description 77
- 230000004907 flux Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000004512 die casting Methods 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000009713 electroplating Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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
- H01F27/24—Magnetic cores
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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
- H01F27/08—Cooling; Ventilating
-
- 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
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
-
- 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
-
- 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
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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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Include magnetic conductor, coil and end pole piece the invention provides a kind of SMD power inductor, the coil is flat wire coil, including coil main body and lead-out wires of coil；Be formed in one structure between the magnetic conductor and the coil；The material tight for constituting the magnetic conductor is coated on the coil main body；The lead-out wires of coil reaches the outside electrode for forming the inductor of the magnetic conductor；The end pole piece being close to magnetic conductor is welded with the electrode；At least provided with one of groove structure and/or fin structure on the magnetic conductor.It is arranged such, on the one hand increases the area of dissipation of magnetic conduction external surface, improve the heat dispersion of inductor so that inductance coil is non-aging, extends the life-span；On the other hand the magnetic flux leakage of inductor is increased so that inductor is difficult saturation, improves the anti-saturation ability of inductor.The invention provides a kind of manufacture method of SMD power inductor.
Description
Technical field
The present invention relates to field of electrical components, more particularly to a kind of SMD power inductor and its manufacture method.
Background technology
SMD inductor can be divided into small power electric sensor and the class of high power inductors two.Small power electric sensor is mainly used in
Video and communication aspects (such as frequency selection circuit, oscillating circuit)；High power inductors are mainly used in DC/DC converters and (are such as used as
Energy-storage travelling wave tube or LC filter elements).The SMD inductor of small-power has 3 kinds of structures：Winding-type chip inductor, multiple field sheet
Inductor, high-frequency type chip inductor, and high power inductors are all winding-type structures.Existing integral type power inductor because
Magnetic conductor is cast into a regular and close entirety with coil, and it is primarily present following both sides shortcoming：
1. heat dispersion is bad, easily make coil aging, reliability reduction；
2., easily there is high current and burns device in anti-saturation poor performance.
The content of the invention
There is provided a kind of SMD power inductor based on above-mentioned.
In addition, also providing a kind of manufacture method of SMD power inductor.
A kind of SMD power inductor, including magnetic conductor, coil and end pole piece, the coil is flat wire coil, bag
Include coil main body and lead-out wires of coil；Be formed in one structure between the magnetic conductor and the coil；Constitute the magnetic conductor
Material tight be coated on the coil main body；The lead-out wires of coil reaches the outside of the magnetic conductor and forms the inductor
Electrode；The end pole piece being close to magnetic conductor is welded with the electrode；
At least provided with one of groove structure and/or fin structure on the magnetic conductor, for increasing area of dissipation and leakage
The quantity of magnetism.
In one of the embodiments, the groove and the fin are continuous type structure or discontinuous form structure, and described
Length direction of the shapes and sizes of groove cross section along the groove is identical；The shapes and sizes edge of the fin cross section
The length direction for the fin is identical.
In one of the embodiments, when setting twice groove described above and/or the fin on the magnetic conductor,
It is be arranged in parallel between the groove or the fin, and the Breadth Maximum of the groove and two fin adjacent edges are most
It is smaller than 2.5 millimeters greatly.
In one of the embodiments, the depth of the groove between the magnetic conductor surface to the coil main body it
Between.
In one of the embodiments, the shape of cross section of the same groove or the fin is circular arc, polygon
Or circular arc and any one in polygonal combination.
In one of the embodiments, the groove or the fin on the upper surface of the magnetic conductor along with described
Circumference or regular polygon centered on the axis of coil main body are set；
The groove or the fin are set on the outer surface of the magnetic conductor along the circumference on the outside of the magnetic conductor
Put, and the setting direction of the groove or the fin and the coil main body axis angle in 0 to 180 degree.
A kind of manufacture method of SMD power inductor, including paint is prepared according to the opering characteristic of electric apparatus for the inductor to be manufactured
Envelope curve coil, and prepare the powder for constituting magnetic conductor；The coil main body is put into a die casting chamber, the coil
Lead-out wire is then reached outside the die casting chamber；The powder is added in the die casting chamber, and carries out die casting processing, makes the powder
Material is tightly packed to be coated in the inside of the coil main body and closely the outside of the coil main body；The lead-out wires of coil is stretched
Go out to outside the magnetic conductor by the powder pressing to be formed the electrode of the inductor；The electricity is taken out from the die casting chamber
Sensor blank and bending, to the bottom surface for being close to the magnetic conductor, is burn-on on electrode respectively by the lead-out wire of the inductor blank
Hold and baking processing is carried out after pole piece；Methods described also includes：
One of groove structure and/or fin structure are at least cut or suppressed on the magnetic conductor, for increasing radiating
Area and magnetic flux leakage；
The coil main body uses the flat wire of resistance to 220 DEG C of high temperature above with plane where flat wire and the coil main body
Axis space angle be 0-90 degree any one angle coiling；
The end pole piece uses copper material, electroplating surfaces with tin processing.
In one of the embodiments, methods described also includes：It is continuous type structure to set the groove and the fin
Or discontinuous form structure, and length direction of the shapes and sizes along the groove of the groove cross section is identical；The fin
Length direction of the shapes and sizes of cross section along the fin is identical.
In one of the embodiments, methods described also includes：The depth of the groove is set between the magnetic conduction body surface
Face is between the coil main body.
In one of the embodiments, methods described also includes：On the upper surface of the magnetic conductor, by the groove or
The fin is set along the circumference centered on the coil main body axis or regular polygon；
On the outer surface of the magnetic conductor, by the groove or the fin along the circumference on the outside of the magnetic conductor
Set, and the setting direction of the groove or the fin and the angle of the coil main body axis are controlled in 0 to 180 degree.
A kind of SMD power inductor and its manufacture method, pass through the appearance of the SMD power inductor in integral type
The groove of the circumferentially disposed regular shape in face so that the SMD power inductor of integral type obtains following beneficial effect：
1. increasing the area of dissipation of magnetic conduction external surface, the heat dispersion of inductor is improved, and then improves inductance
The working temperature environment of coil so that inductance coil is non-aging, extends the life-span；
2. magnetic conduction external surface set groove equivalent on the circulating face of magnetic circuit be provided with abrupt-change cross section, increase
The magnetic flux leakage of inductor so that inductor is difficult saturation, improves the anti-saturation ability of inductor.
Brief description of the drawings
Fig. 1 is inductor upper groove and/or the continuous front broken section structural representation of fin；
Fig. 2 is inductor upper groove and/or the continuous perspective structure perspective diagram of fin；
Fig. 3 is inductor upper groove and/or the continuous left view structural representation of fin；
Fig. 4 is that inductor upper groove and/or fin continuously look up perspective structure schematic diagram；
Fig. 5 is the perspective structure perspective diagram that inductor upper groove and/or fin interruption are set；
Fig. 6 is the left view structural representation that inductor upper groove and/or fin interruption are set.
Description of reference numerals：100. magnetic conductor；110. groove；120. fin；200. coil；210. coil main body；220.
Lead-out wires of coil；300. end pole pieces.
Embodiment
In this patent document, Fig. 1-6 discussed below and for the various implementations of the principle or method that describe the disclosure
Example is served only for explanation, and should not be construed as in any way and limit the scope of the present disclosure.It should be understood by those skilled in the art that
, the principle or method of the disclosure can be realized in any inductor suitably arranged.Refer to the attached drawing, the preferred reality of the disclosure
Example is applied to will be described below.In the following description, the detailed description of well-known function or configuration will be omitted, in order to avoid with
The theme of the unnecessary unnecessary details disclosure.Moreover, term used herein will be defined according to the function of the present invention.Cause
This, the term may be different according to the purpose or usage of user or operator.Therefore, term used herein is necessary
Understood based on the description made herein.
A kind of SMD power inductor, as shown in figures 1 to 6, including magnetic conductor 100, coil 200 and end pole piece 300, institute
Coil 200 is stated for flat wire coil, including coil main body 210 and lead-out wires of coil 220；The magnetic conductor 100 and the coil
Be formed in one structure between 200；The material tight for constituting the magnetic conductor 100 is coated on the coil main body 210；The line
Circle lead-out wire 220 reaches the outside electrode for forming the inductor of the magnetic conductor 100；It is welded with the electrode and magnetic conduction
The end pole piece 300 that body is close to；At least provided with one of structure of groove 110 and/or the structure of fin 120 on the magnetic conductor 100, use
In increase area of dissipation and magnetic flux leakage.The groove is set along the section intersected with the magnetic line of force on the magnetic conductor 100
110, abrupt-change cross section can be set in energized circuit, so that a part of excitation leakage is fallen, enhancing inductor anti-saturation is reached
The effect of ability；Further, since setting the groove 110 to increase area of dissipation, also the heat-sinking capability of inductor is obtained
Enhancing, improves the working environment of the coil main body 200, can the service life of extension coil main body 200.
Wherein, as shown in Fig. 2 Fig. 3 Fig. 4, the groove 110 and the fin 120 are set to continuous type structure, or such as Fig. 5
Discontinuous form structure shown in Fig. 6, and length direction of the shapes and sizes along the groove 110 of the cross section of the groove 110
It is identical；Length direction of the shapes and sizes of the cross section of fin 120 along the fin 120 is identical.It is arranged such, can
Make the magnetic line of force in the magnetic conductor 100 more uniform in the distribution of circumferential direction.
As shown in Figures 1 to 6, when setting twice groove 110 described above and/or the fin 120 on the magnetic conductor
When, it is be arranged in parallel between the groove 110 or the fin 120, and the Breadth Maximum of the groove 110 and two wings
The maximum of the adjacent edge of piece 120 is smaller than 2.5 millimeters.Wherein, be arranged in parallel energy between the groove 110 or the fin 120
Enough make the spacing between the groove 110 or the fin 120 identical, magnetic resistance and magnetic flux leakage distribution are more uniform；Limitation institute
Magnetic resistance can be unlikely to by stating the scope of the Breadth Maximum of groove 110 and the maximum spacing of two adjacent edges of fin 120
It is excessive to cause the hydraulic performance decline of inductor.
The depth of the groove 110 is between the surface of magnetic conductor 100 between the coil main body 200.It is arranged such,
Can maximum limit limit the extension groove 110 depth, and control the width of the groove 110 so that identical groove is wide
Degree obtains bigger magnetic flux leakage, widens the anti-saturation scope of the inductor.
The shape of cross section of the same groove 110 or the fin 120 be circular arc, polygon or circular arc with it is polygon
Any one in the combination of shape.The shape of cross section for being as shown in figures 1 to 6 the groove 110 and the fin 120 is rectangle
Situation.Be arranged such, one be for the ease of processing, two be in order that the grooves 110 more than twice can be easy to it is parallel
Set, making the circumferential parameters of the magnetic conductor 100 tends to be uniformly distributed.
The groove 110 or the fin 120 are on the upper surface of the magnetic conductor along with the coil main body 210
Circumference or regular polygon centered on axis are set.It is arranged such, one is that, for the ease of volume production, two be in order that more than twice
The groove 110 can be arranged in parallel, making the circumferential parameters of the magnetic conductor 100 tends to be uniformly distributed, three be for
Make the outward appearance of the inductor more beautiful and clean.
The groove 110 or the fin 120 are on the outer surface of the magnetic conductor 100 along the magnetic conductor 100
Circumferentially disposed, and the folder of the setting direction of the groove 110 or the fin 120 and the axis of coil main body 210 in outside
Angle is in 0 to 180 degree, the setting direction of fin 120 and the axis of coil main body 210 as described in being shown Fig. 1 Fig. 3 Fig. 6
Angle be 90 degree of situation.
In one of the embodiments, the cross-sectional area of the groove 110 is rectangle, so that adjacent two sides is parallel.
In one of the embodiments, the cross-sectional area of the fin 120 is rectangle, so that adjacent two sides is parallel.
In one of the embodiments, the magnetic conductor upper surface sets twice groove 110 described above, to increase upper table
The area of dissipation in face and the anti-saturation scope for widening the inductor.
In one of the embodiments, the groove 110 is continuous ring-shaped closed structure, to facilitate processing and make institute
Stating the circumferential parameter of magnetic conductor 100 tends to be uniform.
In one of the embodiments, the fin 120 is continuous ring-shaped closed structure, to facilitate processing and make institute
Stating the circumferential parameter of magnetic conductor 100 tends to be uniform.
In one of the embodiments, the width of the groove 110 is 1-2 millimeters, to prevent the excessive influence inductance of magnetic resistance
Other performances of device.
In one of the embodiments, the distance of the adjacent edge of two adjacent fins 120 is 1-2 millimeters, to prevent
Other performances of the excessive influence inductor of magnetic resistance.
In one of the embodiments, the depth of the groove 110 extends to the coil main body 210, to obtain maximum
Mutation area.
In one of the embodiments, the coil main body 210 uses the flat wire of resistance to 220 DEG C of high temperature above, to strengthen
The operating temperature range of inductor.
In one of the embodiments, plane and the space angle of the axis of the coil main body are where the flat wire
90 degree, suppress into a single integrated structure in order to coiling and with the magnetic conductor 100.
In one of the embodiments, setting direction and the line of the fin 120 in the lateral surface of magnetic conductor 100
The angle for enclosing the axis of main body 210 is 90 degree, to facilitate processing.
A kind of SMD power inductor, passes through the circumferentially disposed of the outer surface of the SMD power inductor in integral type
The groove of regular shape so that the SMD power inductor of integral type obtains following beneficial effect：
1. increasing the area of dissipation of magnetic conduction external surface, the heat dispersion of inductor is improved, and then improves inductance
The working temperature environment of coil so that inductance coil is non-aging, extends the life-span；
2. magnetic conduction external surface set groove equivalent on the circulating face of magnetic circuit be provided with abrupt-change cross section, increase
The magnetic flux leakage of inductor so that inductor is difficult saturation, improves the anti-saturation ability of inductor.
According to content described above, this programme additionally provides the manufacture method of SMD inductor described above, including：Root
Enamel wire coil 200 is prepared according to the opering characteristic of electric apparatus for the inductor to be manufactured, and prepares the powder for constituting magnetic conductor 100；Will
The coil main body 210 is put into a die casting chamber, and the lead-out wire 220 of the coil is then reached outside the die casting chamber；Institute
State and the powder is added in die casting chamber, and carry out die casting processing, make the powder tightly packed in the coil main body 210
Portion and the outside for being closely coated on the coil main body 210；The lead-out wires of coil 220 is reached to be formed by the powder pressing
The outside of magnetic conductor 100 form the electrode of the inductor；The inductor blank is taken out from the die casting chamber and by the electricity
Bending, to the bottom surface for being close to the magnetic conductor 100, is carried out the lead-out wire of sensor blank after end pole piece 300 of being burn-on on electrode respectively
Baking is handled.
Methods described, which is additionally included on the magnetic conductor 100, at least cuts or suppresses one of structure of groove 110 and/or wing
The structure of piece 120, for increasing area of dissipation and magnetic flux leakage；
The coil main body 200 uses the flat wire of resistance to 220 DEG C of high temperature above, and with plane where flat wire and the line
The space angle for enclosing the axis of main body 210 is any one angle coiling of 0-90 degree；
The end pole piece 300 uses copper material, and electroplating surfaces with tin handles to reduce contact resistance and prevent copper sheet from aoxidizing.
It is continuous type structure or discontinuous form structure to set the groove 110 and the fin 120, and sets the groove
Length direction of the shapes and sizes of 110 cross sections along the groove 110 is identical；The shape of the cross section of fin 120 and
Length direction of the size along the fin 120 is identical.It is arranged such, can conveniently processes, improve production efficiency.
The grooves 110 or the fin 120 more than twice is be arranged in parallel, and the maximum of the groove 110 is set
The maximum of width and two adjacent edges of fin 120 is smaller than 2.5 millimeters.Being arranged such that conveniently to process, and improve
Production efficiency, can ensure other characterisitic parameters of inductor again.
Set the depth of the groove 110 between the surface of magnetic conductor 100 between the coil main body 210.So
Set, can maximum limit limit the extension groove 110 depth, and control the width of the groove 110 so that identical is recessed
Well width obtains bigger magnetic flux leakage, widens the anti-saturation scope of the inductor.
In addition, on the upper surface of the magnetic conductor 100, by the groove 110 or the fin 120 along with the line
Circumference or regular polygon centered on the circle axis of main body 210 are set.Be arranged such, one be for the ease of volume production, two be in order that
The grooves 110 more than twice can be arranged in parallel, make the circumferential parameters of the magnetic conductor 100 and tend to uniform point
Cloth, three be that the outward appearance of the inductor can be made more beautiful and clean.
On the outer surface of the magnetic conductor 100, by the groove 110 or the fin 120 along the magnetic conductor
It is circumferentially disposed on the outside of 100, and the setting direction of the groove 110 or the fin 120 and the folder of the coil main body axis
Angle is controlled in 0 to 180 degree.The setting direction of fin 120 and the axle of coil main body 210 as described in being shown Fig. 1 Fig. 3 Fig. 6
The angle of line is 90 degree of situation.
In one of the embodiments, the cross-sectional area of the groove 110 is set to rectangle, to facilitate processing, and made
Adjacent two sides is parallel.
In one of the embodiments, the cross-sectional area of the fin 120 is set to rectangle, to facilitate processing, and made
Adjacent two sides is parallel.
In one of the embodiments, twice groove 110 described above is set in the upper surface of magnetic conductor 100, to increase
The area of dissipation of big upper surface and the anti-saturation scope for widening the inductor.
In one of the embodiments, the groove 110 is set to continuous ring-shaped closed structure, to facilitate processing
With the circumferential parameter of the magnetic conductor 100 is tended to be uniform.
In one of the embodiments, the fin 120 is set to continuous ring-shaped closed structure, to facilitate processing
With the circumferential parameter of the magnetic conductor 100 is tended to be uniform.
In one of the embodiments, the width for setting the groove 110 is 1-2 millimeters, to prevent the excessive influence of magnetic resistance
Other performances of inductor.
In one of the embodiments, the distance for setting the adjacent edge of two adjacent fins 120 is 1-2 millimeters, with
Prevent other performances of the excessive influence inductor of magnetic resistance.
In one of the embodiments, the depth of the groove 110 is extended into the coil main body 210, to obtain most
Big mutation area.
In one of the embodiments, the coil main body 210 uses the flat wire of resistance to 220 DEG C of high temperature above, to strengthen
The operating temperature range of inductor.
In one of the embodiments, plane where setting the flat wire and the space of the axis of the coil main body are pressed from both sides
Angle is 90 degree, suppresses into a single integrated structure in order to coiling and with the magnetic conductor 100.
In one of the embodiments, by the fin 120 the lateral surface of magnetic conductor 100 setting direction with it is described
The angle of the axis of coil main body 210 is 90 degree, to facilitate processing.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of SMD power inductor, including magnetic conductor, coil and end pole piece, the coil is flat wire coil, including
Coil main body and lead-out wires of coil；Be formed in one structure between the magnetic conductor and the coil；Constitute the magnetic conductor
Material tight is coated on the coil main body；The lead-out wires of coil reaches the outside formation inductor of the magnetic conductor
Electrode；The end pole piece being close to magnetic conductor is welded with the electrode；It is characterized in that：
At least provided with one of groove structure and/or fin structure on the magnetic conductor, for increasing area of dissipation and magnetic flux leakage.
2. SMD power inductor according to claim 1, it is characterised in that：The groove and the fin are continuous
Type structure or discontinuous form structure, and length direction of the shapes and sizes along the groove of the groove cross section is identical；Institute
State length direction of the shapes and sizes of fin cross section along the fin identical.
3. SMD power inductor according to claim 1 or 2, it is characterised in that：When setting two on the magnetic conductor
When road groove described above and/or the fin, it is be arranged in parallel between the groove or the fin, and the maximum of the groove
The maximum of width and two fin adjacent edges is smaller than 2.5 millimeters.
4. SMD power inductor according to claim 3, it is characterised in that：The depth of the groove is led between described
Magnet surface is between the coil main body.
5. SMD power inductor according to claim 3, it is characterised in that：The same groove or the fin
Shape of cross section is circular arc, polygon or circular arc and any one in polygonal combination.
6. SMD power inductor according to claim 1, it is characterised in that：The groove or the fin are described
Set on the upper surface of magnetic conductor along the circumference centered on the axis of the coil main body or regular polygon；
The groove or the fin on the outer surface of the magnetic conductor along circumferentially disposed on the outside of the magnetic conductor, and
The angle of the setting direction of the groove or the fin and the coil main body axis is in 0 to 180 degree.
7. a kind of manufacture method of SMD power inductor, including enamel-cover is prepared according to the opering characteristic of electric apparatus for the inductor to be manufactured
Line coil, and prepare the powder for constituting magnetic conductor；The coil main body is put into a die casting chamber, the coil draws
Outlet is then reached outside the die casting chamber；The powder is added in the die casting chamber, and carries out die casting processing, makes the powder
It is tightly packed to be coated in the inside of the coil main body and closely the outside of the coil main body；The lead-out wires of coil stretches out
The electrode of the inductor is formed outside to the magnetic conductor by the powder pressing；The inductance is taken out from the die casting chamber
Device blank and bending is to the bottom surface for being close to the magnetic conductor respectively by the lead-out wire of the inductor blank, end of being burn-on on electrode
Baking processing is carried out after pole piece；Characterized in that, methods described also includes：
One of groove structure and/or fin structure are at least cut or suppressed on the magnetic conductor, for increasing area of dissipation
And magnetic flux leakage；
The coil main body uses the flat wire of resistance to 220 DEG C of high temperature above with plane where flat wire and the axle of the coil main body
The space angle of line is any one angle coiling of 0-90 degree；
The end pole piece uses copper material, electroplating surfaces with tin processing.
8. the manufacture method of SMD power inductor according to claim 7, it is characterised in that methods described is also wrapped
Include：
It is continuous type structure or discontinuous form structure to set the groove and the fin, and the shape of the groove cross section and big
The small length direction along the groove is identical；Length direction of the shapes and sizes of the fin cross section along the fin
It is identical.
9. the manufacture method of SMD power inductor according to claim 7, it is characterised in that methods described is also wrapped
Include：
Set the depth of the groove between the magnetic conductor surface between the coil main body.
10. the manufacture method of SMD power inductor according to claim 7, it is characterised in that methods described is also wrapped
Include：
On the upper surface of the magnetic conductor, by the groove or the fin along centered on the coil main body axis
Circumference or regular polygon are set；
On the outer surface of the magnetic conductor, the groove or the fin are set along the circumference on the outside of the magnetic conductor
Put, and the setting direction of the groove or the fin and the angle of the coil main body axis are controlled in 0 to 180 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657552.3A CN107316736A (en) | 2017-08-03 | 2017-08-03 | SMD power inductor and its manufacture method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657552.3A CN107316736A (en) | 2017-08-03 | 2017-08-03 | SMD power inductor and its manufacture method |
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| Publication Number | Publication Date |
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| CN107316736A true CN107316736A (en) | 2017-11-03 |
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