CN109003790A - A kind of wireless charging transmitting coil and preparation method thereof - Google Patents
A kind of wireless charging transmitting coil and preparation method thereof Download PDFInfo
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- CN109003790A CN109003790A CN201810846465.7A CN201810846465A CN109003790A CN 109003790 A CN109003790 A CN 109003790A CN 201810846465 A CN201810846465 A CN 201810846465A CN 109003790 A CN109003790 A CN 109003790A
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Classifications
-
- 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
-
- 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
- H01F27/2823—Wires
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of wireless charging transmitting coils and preparation method thereof, it includes the more than one coil as made of conductive metal wire coiling, and with the integrally formed soft magnetic bodies externally-packed structure of the coil；Insulating layer is surrounded by outside the conductive metal wire, coil is located inside soft magnetic bodies externally-packed structure and exposes pin, and soft magnetic bodies externally-packed structure material is the mixture of macromolecule resin and sheet soft magnet powder.Transmitting coil of the present invention and the direct seamless interfacing of magnetic material, are integrated, and avoid air gap caused by when conventional coil pastes magnetic material, effectively reduce energy transfer losses, improve charge efficiency；The magnetic materials such as ferrite sheet need not separately be matched when in use simultaneously, it is convenient directly to use, and can effectively avoid the external metallization interference problem in charging process.
Description
Technical field
The invention belongs to wireless chargings and Material Field, send out more particularly, to a kind of wireless charging compound with magnetic material
Ray circle and preparation method thereof.
Background technique
In recent years, wireless charging technology is gradually being used by more and more electronic products by easy to use.Nothing
Line charge power technology mainly has electromagnetic induction, magnetic resonance and radio wave isotype at this stage.In electromagnetic induction or mode of resonance
Under formula, transmitting terminal emits electromagnetic energy by transmitting coil, is converted into electric energy to equipment charge by equipment receiving end receiving coil.
There are many disclose a kind of wireless charging in production and coiling form, such as application for a patent for invention CN107452483 for transmitting coil
Coil and the method for making Wireless charging coil, include multiple conducting wire groups, multiple circle lines are winding on identical coiling face
Circle can reduce skin effect and kindred effect, reduce DC impedance；One is disclosed in application for a patent for invention CN106026421
Kind has the Wireless charging coil of rectangular topological structure, can reduce device relative displacement influence caused by charging；Invention is special
Benefit application CN 108063044 discloses a kind of symmetrical loop construction, contains magnetics substrate and magnetic screen at outside upper lower two layers of coil
Layer is suitable for electric vehicle wireless charging field.However when the coil of such as above structure and magnetic material are used cooperatively at present,
Air gap can be left between material, to influence charge efficiency, while can not effectively armoured magnetic field and surrounding metal
Interference.
Summary of the invention
It is a kind of directly multiple with magnetic material the technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide
The Wireless charging coil of conjunction, the complete exclusion that air gap and metal are interfered when realizing charging.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is as follows:
A kind of wireless charging transmitting coil, it includes the more than one coil as made of conductive metal wire coiling, and
With the integrally formed soft magnetic bodies externally-packed structure of the coil；It is surrounded by insulating layer outside the conductive metal wire, coil is located at soft magnetic bodies
Inside externally-packed structure and expose pin, soft magnetic bodies externally-packed structure material is the mixture of macromolecule resin and sheet soft magnet powder.
The prior art is usually to place the coil in soft magnetic bodies surface, or form slot on soft magnetic bodies surface, then by coil
It is placed in slot, air gap can be left between this method coil and soft magnetic bodies, coil is still to be exposed to receiving coil, nothing
The interference of method armoured magnetic field and surrounding metal.Coil is directly molded in specific soft magnetic materials by the present invention, make coil with it is soft
Magnet externally-packed structure seamless interfacing is integrated, and forms a closely knit entirety, interferes when realizing charging air gap and metal
Complete exclusion.
Wherein, the macromolecule resin is solvent type heat-curing macromolecule resin, including but not limited to polyurethane, aqueous poly-
Urethane, polyvinyl alcohol, any one or mixture two or more in them in epoxy resin.
The sheet soft magnet powder include but is not limited to permalloy powder, iron aluminum silicon powder, iron silicon powder, iron, silicon, aluminum and nickel alloy powder or
Iron silicochromium powder.
The Solid content quality of the macromolecule resin and the mass ratio of sheet soft magnet powder are 1:2~1:9.
The insulating layer includes but is not limited to insulated paint or insulated wire.
The conductive metal wire is copper wire, silver wire, Kufil gold thread or silver-nickel line.
The present invention also provides the production methods of above-mentioned wireless charging transmitting coil, include the following steps:
Step 1: the conductive metal wire for being surrounded by insulating layer is turned into coil；Sheet soft magnet powder is added to molten with solvent
In the macromolecule resin of solution, it is uniformly mixing to obtain slurry；
Step 2: the slurry that step 1 is obtained pours into mold, and will be put into slurry and be in around the coil made
The middle position of slurry；
Step 3: the slurry that step 2 contains coil is taken out after mold internal heating curing, molding, and wireless charging is made
Transmitting coil.
In step 1, the solvent includes but is not limited to acetone, butanone, n,N-Dimethylformamide, tetrahydrofuran, acetic acid
Ethyl ester, water, ethyl alcohol, any one or mixture two or more in them in methanol.
The Solid content quality of the macromolecule resin and the mass ratio of sheet soft magnet powder are 1:2~1:9.
In step 2, the mold is provided with deep 0.05mm~5mm slot, the mold can be it is open have depth 0.05mm~
The mold of 5mm slot is also possible to the mold that upper layer and lower layer structure forms slot with the depth gap 0.05mm~5mm；The shape of slot can
Sight loop-shaped is selected, generally rectangular cross-section slot.
In step 3, the temperature being heating and curing is 30~200 DEG C, until slurry curing is complete.
It should be pointed out that above-mentioned coil can be individual one, be also possible to it is multiple, when using three coils,
These three coils, which have, to be overlappingly arranged together, and be can be and is arranged in " I " fonts, and intermediate coil is horizontal to be overlapped on two be vertically arranged
On the coil on side, it is also possible to arrange in " scholar " font；The shape of coil can be circle, be also possible to containing circular arc chamfering
Square coil.
Above-mentioned coil is in the soft magnet powder of resin package, with the line for being directly in formation inductance in soft magnet powder pressed material
Circle has essential difference.Directly in the coil in soft magnet powder pressed material due to being in metal environment, magnetic powder can directly result in whirlpool
Stream and loss, can not charge to receiving coil.
The utility model has the advantages that
Transmitting coil of the present invention and the direct seamless interfacing of magnetic material, are integrated, avoid conventional coil and paste magnetism
Air gap caused by when material, effectively reduces energy transfer losses, improves charge efficiency；It simultaneously when in use need not be another
The magnetic materials such as row matching ferrite sheet, it is convenient directly to use, and can effectively avoid the external metallization in charging process from interfering and ask
Topic.
Detailed description of the invention
The present invention is done with reference to the accompanying drawings and detailed description and is further illustrated, of the invention is above-mentioned
And/or otherwise advantage will become apparent.
Fig. 1 is 1 wireless charging transmitting coil schematic perspective view of embodiment；
Fig. 2 is 1 wireless charging transmitting coil side structure schematic diagram of embodiment；
Fig. 3 is 2 wireless charging transmitting coil schematic perspective view of embodiment.
Specific embodiment
According to following embodiments, the present invention may be better understood.
Structure depicted in Figure of description, ratio, size etc., only to cooperate the revealed content of specification, with
Understand for those skilled in the art and read, be not intended to limit the invention enforceable qualifications, therefore does not have technically
Essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size can be generated not influencing the present invention
Under effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents can cover.Meanwhile
Cited such as "upper", "lower", "front", "rear", " centre " term in this specification are merely convenient to being illustrated for narration, and
It is non-that to limit the scope of the invention, relativeness is altered or modified, under the content of no substantial changes in technology, when
Also it is considered as the scope that the present invention is implemented.
Embodiment 1
By wireless charging transmitting coil as shown in Figure 1 is made of following steps, wherein 1 is macromolecule resin, 2 be sheet
Soft magnet powder, 3 be coil；Macromolecule resin 1 and sheet soft magnet powder 2 constitute the soft magnetic bodies externally-packed structure for wrapping coil 3.
1) silk-covered copper wire for being 0.08*105p with line footpath closely turns to the sky of internal diameter 20.5mm, outer diameter 43mm counterclockwise
Heart circular coil；
2) sheet iron-silicon-aluminum soft magnet powder is added in the sealing end type polyurethane of butanone dissolution, makes polyurethane solid content ingredient
Mass ratio with Fe-Si-Al magnetic is 1:4, and is sufficiently stirred with machine mixer and uniform sizing material is made；
3) slurry made is poured into the rectangular slot for being provided with 50mm*60mm size, groove depth as the stainless steel mould of 1.2mm
It is interior, and will be put into slurry around the coil made, so that coil is in the middle layer position of slurry, and expose the pin of coil；
4) by the slurry containing coil in mold with 80 DEG C at a temperature of be heating and curing, the tree at this time containing sheet soft magnet powder
Rouge has become with coil and is integrated, and is removed from the molds, and compound wireless charging transmitting coil is made.Gained wireless charging hair
The side structure of ray circle is as shown in Fig. 2, and show the relative position of each component.
Embodiment 2
Wireless charging transmitting winding group as shown in Figure 3 is prepared as follows, wherein 1 is macromolecule resin, 2 be sheet
Soft magnet powder, 4 be three-winding structure；Macromolecule resin 1 and sheet soft magnet powder 2 are constituted outside the soft magnetic bodies for wrapping three-winding structure 4
Pack arrangement.
1) three hollow rectangle shape coils of silk-covered copper wire coiling are used, make their outer diameter 39*46.2mm, internal diameter is
17.2*26.2mm, and reserve pin wiring respectively to connect control circuit；
2) sheet iron silicochromium soft magnet powder is added in the aqueous polyurethane of water dissolution, makes aqueous polyurethane solid content ingredient
Mass ratio with iron silicochromium soft magnet powder is 1:3, and is sufficiently stirred with machine mixer and uniform sizing material is made；
3) slurry made pours into the rectangular slot for being provided with 50mm*60mm size, groove depth is in the mold of 2mm, and
It will be put into slurry around the coil made, three coils made to arrange in " I " fonts, as shown in figure 3, intermediate coil overlaps both sides
Coil, and this structure for allowing three coils to constitute is in the middle layer position of slurry；
4) slurry containing coil and mold 100 DEG C of baking ovens are put into togerther to be heating and curing, it will be compound after curing molding
Molding structure deviates from mold, obtains one group of wireless charging transmitting coil, perspective view is as shown in Figure 3.Coil can be directly connected to control
Circuit directly carries out wireless charging to the equipment equipped with receiving end.
Embodiment 3
The wireless charging countdown circuit of Qi standard will be connected to by Wireless charging coil made from method in embodiment 1
On plate, wireless charging transmitter is made.This transmitter is connected on digital display voltage source, and is 5V by output voltage setting, it is right
It charges the receiving end for coating the matching receiving coil that copper wire turns to containing insulating layer.Receiving end is connected to when charging negative
It carries on instrument, and adjust load impedance to make to receive power 5W.By the electric current registration on observation digital display voltage source, with reception power
Divided by the product of output voltage and output electric current, charging transformation efficiency is obtained.After measured, the transformation efficiency of the specific structure is
74%.
As a comparison, it is charged transmitting coil, but is not made by the method in embodiment 1 multiple with same silk-covered copper wire coiling
Zygonema circle, but directly by the manganese-zinc ferrite that the coil made is covered on that complex permeability real part is 300, connection is same
The wireless charging countdown circuit plate of Qi standard, is attempted by same digital display voltage source, and the same output voltage that is arranged is 5V,
It charges to the receiving end of the identical matching receiving coil turned to containing insulating layer cladding copper wire.When charging, receiving end
It connects in same load meter, makes to receive power 5W by adjusting load impedance.Charging conversion is measured using same method
Efficiency, only 69%.
Embodiment 4
The control three-winding wireless charging of Qi standard will be connected to by Wireless charging coil group made from method in embodiment 2
On countdown circuit plate, wireless charging transmitter is made.This transmitter is connected on digital display voltage source, and by output voltage
It is set as 5V, the unicoil receiving end that the rated power to compound Qi standard is 5W is charged.Receiving end is connected when charging
Onto load meter, and adjusts load impedance and make receiving end power 5W.By the electric current registration on observation digital display voltage source, with connecing
Power is received divided by the product of output voltage and output electric current, obtains charging transformation efficiency, measuring transformation efficiency is 78%.When with not
When the steel metal plate that becomes rusty covers receiving end, efficiency is reduced to 75%, the range of decrease 3.8%.
As a comparison, connect same control circuit with same three-winding structure, but by embodiment 2 method with
Resin compounded containing soft magnet powder, but it is pasted onto the nickel-zinc ferrite on piece that magnetic conductivity is 300, phase is pressed to same receiving end
Charge efficiency test is carried out with method, measuring conversion ratio is 75%.When covering receiving end with identical stainless steel plate, effect
Rate is reduced to 68%, the range of decrease 9.3%.This illustrates that the compound coil in the present invention can not only guarantee and improve wireless charging
Charge transformation efficiency, while can also reduce interference of the metal to wireless charging device.In fact, for the wireless charging of Qi standard
It is bigger to reach efficient difficulty under lower reception power for device.For the practical application scene of 5W, in charge efficiency
After reaching 65%, when especially 70% or more, every percentage point of raising has significant difficulty, and the optimization of coil version is just
Seem particularly critical.
It can be seen from the above embodiments that, what the macromolecule resin provided by the invention containing sheet soft magnet powder was formed answers
Wireless charging transmitting coil is closed while convenient to use, energy transfer losses can be reduced, improves charge efficiency, while can
Reduce the interference of metal and ambient enviroment to charging.It should be pointed out that the coil in the present invention is in the soft magnetism of resin package
In powder, this has essence different from the coil for forming inductance in soft magnet powder pressed material is directly in.Directly material is suppressed in soft magnet powder
For coil in material due to being in metal environment, magnetic powder can directly result in vortex and loss, can not charge to receiving coil.
The present invention provides the thinkings and method of a kind of wireless charging transmitting coil and preparation method thereof, implement the skill
There are many method and approach of art scheme, the above is only a preferred embodiment of the present invention, it is noted that this technology is led
For the those of ordinary skill in domain, various improvements and modifications may be made without departing from the principle of the present invention, these
Improvements and modifications also should be regarded as protection scope of the present invention.The available prior art of each component part being not known in the present embodiment
It is realized.
Claims (10)
1. a kind of wireless charging transmitting coil, which is characterized in that it includes more than one as made of conductive metal wire coiling
Coil, and with the integrally formed soft magnetic bodies externally-packed structure of the coil；Insulating layer, coil position are surrounded by outside the conductive metal wire
Inside soft magnetic bodies externally-packed structures and expose pin, soft magnetic bodies externally-packed structure material is the mixed of macromolecule resin and sheet soft magnet powder
Close object.
2. a kind of wireless charging transmitting coil according to claim 1, which is characterized in that the macromolecule resin is solvent
Type thermally curable polymer resin, any one or they in polyurethane, aqueous polyurethane, polyvinyl alcohol, epoxy resin
In two or more mixture.
3. a kind of wireless charging transmitting coil according to claim 1, which is characterized in that the sheet soft magnet powder is perm
Alloyed powder, iron aluminum silicon powder, iron silicon powder, iron, silicon, aluminum and nickel alloy powder or iron silicochromium powder.
4. a kind of wireless charging transmitting coil according to claim 1, which is characterized in that consolidating for the macromolecule resin contains
The mass ratio of amount of substance and sheet soft magnet powder is 1:2~1:9.
5. a kind of wireless charging transmitting coil according to claim 1, which is characterized in that the insulating layer be insulated paint or
Insulated wire.
6. the production method of wireless charging transmitting coil described in claim 1, which comprises the steps of:
Step 1: the conductive metal wire for being surrounded by insulating layer is turned into coil；Sheet soft magnet powder is added to solvent dissolution
In macromolecule resin, it is uniformly mixing to obtain slurry；
Step 2: the slurry that step 1 is obtained pours into mold, and will be put into slurry around the coil made and be in slurry
Middle position；
Step 3: the slurry that step 2 contains coil is taken out after mold internal heating curing, molding, and wireless charging transmitting is made
Coil.
7. the production method of wireless charging transmitting coil according to claim 6, which is characterized in that described in step 1
Solvent is any one in acetone, butanone, N,N-dimethylformamide, tetrahydrofuran, ethyl acetate, water, ethyl alcohol or methanol
Kind or mixture two or more in them.
8. the production method of wireless charging transmitting coil according to claim 6, which is characterized in that described in step 1
The Solid content quality of macromolecule resin and the mass ratio of sheet soft magnet powder are 1:2~1:9.
9. the production method of wireless charging transmitting coil according to claim 6, which is characterized in that described in step 2
Mold is provided with deep 0.05mm~5mm slot.
10. the production method of wireless charging transmitting coil according to claim 6, which is characterized in that described in step 3
The temperature being heating and curing is 30~200 DEG C.
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| CN111724982A (en) * | 2019-03-22 | 2020-09-29 | 乾坤科技股份有限公司 | Coils and Coil Structures |
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| CN112290634A (en) * | 2020-11-03 | 2021-01-29 | Tcl通讯（宁波）有限公司 | Charging device |
| CN114825650A (en) * | 2022-03-21 | 2022-07-29 | 中国人民解放军海军工程大学 | Array type wireless power transmission transmitting coil, design method and application |
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| CN118713313A (en) * | 2024-08-28 | 2024-09-27 | 杭州神络医疗科技有限公司 | Wireless charging receiver manufacturing method and neural stimulator |
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