CN209641492U - Coil, wireless power transmitter, receiver, near-field communication device and electronic equipment - Google Patents
Coil, wireless power transmitter, receiver, near-field communication device and electronic equipment Download PDFInfo
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- CN209641492U CN209641492U CN201822115374.4U CN201822115374U CN209641492U CN 209641492 U CN209641492 U CN 209641492U CN 201822115374 U CN201822115374 U CN 201822115374U CN 209641492 U CN209641492 U CN 209641492U
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Abstract
The utility model discloses a kind of plane coiled wire-wound coils, including multilayer wire ring layer；Wherein at least one layer of multilayer wire ring layer for by outer ring around to the First Line ring layer of inner ring, one layer for by inner ring around to the second coil layer of outer ring；First Line ring layer includes N stock the first coiling cabling；Second coil layer includes M stock the second coiling cabling；Wherein, N >=2, M >=2；The end of the end of the outer ring of First Line ring layer and the outer ring of the second coil layer is connect with external signal receiving unit；The inner ring end of First Line ring layer and the inner ring end of the second coil layer are electrically connected.This kind of plane coiled wire-wound coil can efficiently use multilayer space, cabling is sufficient filling in each region, so that coil has both the advantage of performance and thickness.The utility model additionally provides a kind of wireless power transmitter, receiver, near-field communication device and electronic equipment.
Description
Technical field
The utility model belongs to electronic technology field more particularly to a kind of plane coiled wire-wound coil, wireless power transmitter, connects
Receive device, near-field communication device and electronic equipment.
Background technique
Inductance coil it is more and more common use on an electronic device, especially some novel applications, such as closely
Wireless communication technique NFC (Near Field Communication), wireless charging (wireless charging) etc..
Coiled wire-wound coil is more cheap relative to FPC coil cost, is applied to want performance and size more and more widely
Seek the highest wireless charging receiving terminal of degree.
However, traditional multiply plane coiled wire-wound coil inner ring lead-out wire is needed to skip and be led to outside outer ring above coil, lead
Regional area thickness thickens herein for cause, and local thickness can bring the increase of whole coil design thickness, and except regional area
Thickness does not fully utilize, therefore traditional multiply plane one significant drawback of coiled wire-wound coil is that thickness is thicker, effectively benefit
It is not high with space.
Utility model content
The technical purpose of the utility model is to provide a kind of plane coiled wire-wound coil, wireless power transmitter, receiver, near field
Communicator and electronic equipment, this kind of plane coiled wire-wound coil can efficiently use multilayer space, and cabling is sufficiently filled out in each region
It fills, so that coil has both the advantage of performance and thickness.
To solve the above problems, the technical solution of the utility model are as follows:
A kind of plane coiled wire-wound coil, including multilayer wire ring layer；Wherein at least one layer of the multilayer wire ring layer for by outer ring around
To the First Line ring layer of inner ring, one layer for by inner ring around to the second coil layer of outer ring；The First Line ring layer includes N stock first
Coiling cabling；Second coil layer includes M stock the second coiling cabling；Wherein, N >=2, M >=2；
The end of the end of the outer ring of the First Line ring layer and the outer ring of second coil layer connects with external signal
Receive unit connection；
The inner ring end of the First Line ring layer and the inner ring end of second coil layer are electrically connected.
According to an embodiment of the present invention, the inner ring end of N strands of the first coiling cablings and M bursts of second coilings
The inner ring end of cabling is integrally electrically connected.
According to an embodiment of the present invention, N=M, the inner ring end of the first coiling cabling and second coiling
The inner ring end of cabling, which corresponds, to be electrically connected.
According to an embodiment of the present invention, N ≠ M, described in the inner ring end and part of part the first coiling cabling
The inner ring end of second coiling cabling, which corresponds, to be electrically connected；
The whole electricity in the inner ring end of remaining the first coiling cabling and the inner ring end of remaining the second coiling cabling
Property connection.
According to an embodiment of the present invention, along the direction in inside to the outside of the plane coiled wire-wound coil, there are
The inner ring end of i-th strand of the first coiling cabling is only electrically connected with the inner ring end of jth stock the second coiling cabling；And
There are the inner ring ends of the i-th ' strands of the first coiling cabling only and in ' strands of jth the second coiling cablings
Enclose end electrical connection；
Wherein, 1≤i < i '≤N, 1≤j ' < j≤M.
According to an embodiment of the present invention, the inner ring of the inner ring end of the First Line ring layer and second coil layer
End is electrically connected as welding electrical connection or riveting electrical connection.
According to an embodiment of the present invention, the First Line ring layer and second coil layer are glued together；It is described
The inner ring end of First Line ring layer and the welding electrical connection of the inner ring end of second coil layer or riveting electrical connection.
According to an embodiment of the present invention, plane coiled wire-wound coil further includes FPC plate, and the First Line ring layer is formed in institute
The upper face of FPC plate is stated, second coil layer is formed in the lower face of the FPC plate, and the FPC plate is connected equipped with pad
Portion, the inner ring end of the First Line ring layer, second coil layer the equal and described pad interconnecting piece in inner ring end electrically connect
It connects.
According to an embodiment of the present invention, the diameter D1 of the first coiling cabling and the second coiling cabling it is straight
Diameter D2 meets following relationship:
Wherein, d is skin depth of the plane cabling under the working frequency of the coil；F is the work of the coil
Working frequency；μ is the magnetic conductivity of the coil cabling；For the conductivity of the coil cabling.
The utility model additionally provides a kind of wireless power transmitter, comprising:
Electric power transmit coil portion, to transmit wirelessly electric power；And
Power supply, the power supply of Xiang Suoshu electric power transmit coil portion；
Wherein,
The electric power transmit coil portion includes plane coiled wire-wound coil described in above-mentioned any one；
The power supply and the external signal receiving unit are electrically connected, by the external signal receiving unit to institute
State the power supply of plane coiled wire-wound coil；Or
The power supply is directly powered to the plane coiled wire-wound coil as the external signal receiving unit.
The utility model additionally provides a kind of wireless power receiver, comprising:
Power reception coil portion, to receive the wireless power；And
Electric power switching part converts the received wireless power in power reception coil portion to power device；
Wherein,
The power reception coil portion includes plane coiled wire-wound coil described in above-mentioned any one；
The electric power switching part and the external signal receiving unit are electrically connected, and the power reception coil portion is received
Wireless power is transmitted to the electric power switching part by the external signal receiving unit；Or
The electric power switching part directly transmits the power reception coil portion as the external signal receiving unit and receives
Wireless power.
The utility model additionally provides a kind of near-field communication device, including plane coiled wire-wound coil described in above-mentioned any one.
The utility model additionally provides a kind of electronic equipment, including above-mentioned wireless power transmitter, with radio
Power sending function；And/or
Including above-mentioned wireless power receiver, with wireless power receive capabilities；And/or
Including above-mentioned near-field communication device, to have the function of near-field communication.
The utility model due to using the technology described above, has the following advantages that it compared with prior art and actively
Effect:
An embodiment of the present invention is by being divided into multiply for the plane coiling cabling of First Line ring layer and the second coil layer
Sub- plane coiling cabling reduces influence of the skin effect to coil, increases the Q value of coil.By by First Line ring layer
The end of the end of outer ring and the outer ring of the second coil layer is connect with external signal receiving unit, the inner ring end of First Line ring layer
End and the inner ring end of the second coil layer are electrically connected, and plane coiled wire-wound coil inner ring lead-out wire is not needed to skip above coil and be drawn
It to outer ring, avoids regional area thickness and thickens, the increase of whole coil design thickness, this kind of plane coiling will not be brought
Coil can efficiently use multilayer space, and cabling is sufficient filling in each region, so that coil has both the excellent of performance and thickness
Gesture.
The inner ring end of N stock the first coiling cabling of coil in an embodiment of the present invention and M the first coiling of stock are walked
The inner ring end of line is connected using the form of line sequence transformation (coiling cabling cross stranding) electrical connection, the shape of cross stranding electrical connection
Formula can further suppress the skin effect of coil device, increase the inductance of coil device, improve the quality of coil device
Factor and efficiency of transmission.
Detailed description of the invention
Fig. 1 is a kind of plane coiled wire-wound coil structure chart of the invention；
Fig. 2 is another plane coiled wire-wound coil structure chart of the invention；
Fig. 3 is the reverse side figure of plane coiled wire-wound coil shown in Fig. 2；
Fig. 4 is another plane coiled wire-wound coil structure chart of the invention；
Fig. 5 is another plane coiled wire-wound coil structure chart of the invention；
Fig. 6 is another plane coiled wire-wound coil structure chart of the invention；
Fig. 7 is another plane coiled wire-wound coil structure chart of the invention；
Fig. 8 is another plane coiled wire-wound coil structure chart of the invention；
Fig. 9 is the region C partial enlarged view in Fig. 8.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to the utility model proposes a kind of plane coiled wire-wound coil, wireless power send out
Device, receiver, near-field communication device and electronic equipment is sent to be described in further detail.According to following explanation and claims, originally
The advantages of utility model and feature will become apparent from.
Embodiment 1
Referring to Fig. 1 to Fig. 8, a kind of plane coiled wire-wound coil, including multilayer wire ring layer；Wherein at least one layer of multilayer wire ring layer is
By outer ring around to the First Line ring layer 1 of inner ring, one layer for by inner ring around to the second coil layer 2 of outer ring；First Line ring layer 1 includes
N the first coiling of stock cabling (the non-FPC cabling of coiling cabling, similarly hereinafter)；Second coil layer 2 includes M stock the second coiling cabling；Wherein, N
>=2, M >=2；The end of the end of the outer ring of First Line ring layer 1 and the outer ring of the second coil layer 2 and external signal receiving unit
Connection；The inner ring end of First Line ring layer 1 and the inner ring end of the second coil layer 2 are electrically connected.
The present embodiment is by being divided into the parallel coiling of multiply for First Line ring layer 1 and the plane coiling cabling of the second coil layer 2
Cabling reduces influence of the skin effect to coil, increases the Q value of coil.By by the end of the outer ring of First Line ring layer 1
And second the end of outer ring of coil layer 2 connect with external signal receiving unit, the inner ring end of First Line ring layer 1 and second
The inner ring end of coil layer 2 is electrically connected, and plane coiled wire-wound coil inner ring lead-out wire, which does not need to skip above coil, leads to outer ring
Outside avoids regional area thickness and thickens, and will not bring the increase of whole coil design thickness, this kind of plane coiled wire-wound coil energy
Multilayer space is enough efficiently used, cabling is sufficient filling in each region, so that coil has both the advantage of performance and thickness.
Further, First Line ring layer 1 and the second coil layer 2 are glued together；The inner ring end of First Line ring layer 1 and
The welding electrical connection of inner ring end or riveting electrical connection of two wires ring layer 2.
Further, referring to Fig. 2 and Fig. 3, plane coiled wire-wound coil further includes two-sided FPC plate 3, the formation of First Line ring layer 1
In the upper face of FPC plate 3, the second coil layer 2 is formed in the lower face of FPC plate 3, and FPC plate 3 is equipped with pad interconnecting piece 4, and first
The inner ring end of coil layer 1, the second coil layer 2 inner ring end with pad interconnecting piece 4 be electrically connected.
Further, the inner ring end of the first coiling of N stock cabling and the inner ring end of M stock the second coiling cabling are whole electrically
Connection.Referring to Fig. 1, the first coiling cabling, the second coiling cabling have four strands in a specific embodiment, four strand of first coiling
Cabling and four strand of second coiling cabling connect one to one.For convenience of description, it makes definitions first to each layer coil-winding cabling.
Along the direction in inside to the outside of plane coiled wire-wound coil, the first coiling cabling of First Line ring layer 1 be denoted as respectively a1, a2, a3,
The second coiling cabling of a4, the second coil layer 2 are denoted as b1, b2, b3, b4 respectively.The end of four strand of first coiling cabling it is whole and
The end of four strand of second coiling cabling, which is integrally electrically connected, to be specifically as follows the end of a1, a2, a3, a4 and is electrically connected to form a conduction
Area, the end of b1, b2, b3, b4 are electrically connected to form a conduction region, and two conduction regions weld or rivet electrical connection and realize two layer lines
Circle changes layer.
Further, the inner ring end of N=M, the inner ring end of the first coiling cabling and the second coiling cabling corresponds
It is electrically connected.Referring to Fig. 2, Fig. 3 and Fig. 4, the first coiling cabling, the second coiling cabling have four in a specific embodiment
Stock, four strand of first coiling cabling and four strand of second coiling cabling connect one to one.For convenience of description, first to each layer line circle around
Line cabling is made definitions.Along the direction in inside to the outside of plane coiled wire-wound coil, the first coiling cabling point of First Line ring layer 1
It is not denoted as a1, a2, a3, a4, the second coiling cabling of the second coil layer 2 is denoted as b1, b2, b3, b4 respectively.Four strand of first coiling is walked
The structure that line and four strand of second coiling cabling connect one to one is specially that a1 is connected with b1, and a2 is connected with b2, and a3 is connected with b3,
A4 is connected with b4.
Further, N ≠ M, the inner ring end of the first coiling of part cabling and the inner ring end of the second coiling of part cabling
It corresponds and is electrically connected；The whole electricity in the inner ring end of remaining the first coiling cabling and the inner ring end of remaining the second coiling cabling
Property connection.It is made an explanation with a concrete mode, for example, N=4, M=5, two strands of the first coiling cablings and two strand of second coiling are walked
Line connects one to one；Other two strand of first coiling cabling and other three strand of second coiling cabling integrated connection.
Preferably, the diameter D2 of the diameter D1 of the first coiling cabling and the second coiling cabling meets following relationship: D1≤
3d；D2≤3d；Wherein, d is skin depth of the plane cabling under the working frequency of coil；F is coil
Working frequency；μ is the magnetic conductivity of coil cabling；For the conductivity of coil cabling.By the line for making multiply plane coiling cabling
Diameter be not more than 3 times of coil cabling skin depth, effectively inhibit influence of the skin effect to coil, further increase
The Q value of coil.
Embodiment 2
Referring to Fig. 5-Fig. 7, the present embodiment provides a kind of higher coil of transmission performance on the basis of embodiment 1,
The mode for intersecting coiling is realized on planar coil, in this way similar to the twisted coiling of volume body coils, coil transmission performance is more preferable.
Specifically, along the direction in inside to the outside of plane coiled wire-wound coil, there are the inner ring ends of i-th strand of first coiling cabling only
It is electrically connected with the inner ring end of jth stock the second coiling cabling；And there are the inner ring ends of i-th ' stock the first coiling cabling only
It is electrically connected with the inner ring end of jth ' stock the second coiling cabling；Wherein, 1≤i < i '≤N, 1≤j ' < j≤M.In the present embodiment
Coil N stock the first coiling cabling inner ring end and M stock the first coiling cabling inner ring end using line sequence convert (coiling
Cabling cross stranding) electrical connection form connection, cross stranding electrical connection form can further suppress becoming for coil device
Skin effect increases the inductance of coil device, improves the quality factor and efficiency of transmission of coil device.
Coil at least partly coiling cabling in the present embodiment is cross stranding connection, and the first coiling cabling is connected to the
After two coiling cablings, line sequence is changed, that is, two layers of coiling cabling is intersected.Coil in the present embodiment is one
The form of kind plane coiled wire-wound coil, this coiling cabling cross stranding electrical connection is similar to volume body coils (for example, multiple twin is linear
Formula) in the twisted connection of multiply solid cabling form, the form of this kind of cross stranding electrical connection can further suppress coil dress
The skin effect set increases the inductance of coil device, improves the quality factor and efficiency of transmission of coil device.In other words,
The utility model is on the basis of multiply (N >=2, M >=2) multilayer (for example, First Line ring layer 1, the second coil layer 2) series coil
On, further by the coiling interconnection of upper layer and lower layer coil, the quality factor of coil are improved, this kind of mode does not increase line
The surface area and thickness of circle.
The coil of the present embodiment is further introduced with reference to the accompanying drawing, is illustrated with N=M=4.
For convenience of description, it makes definitions first to each layer coil-winding cabling.Along the inside of plane coiled wire-wound coil to outer
The direction of side, the first coiling cabling of First Line ring layer 1 are denoted as a1, a2, a3, a4 respectively, and the second coiling of the second coil layer 2 is walked
Line is denoted as b1, b2, b3, b4 respectively.
Referring to Fig. 5, in the specific embodiment of cross stranding connection, a1 connect with b2, and a2 is connected with b1, a3 with
B3 connection, a4 are connected with b4, and the first coiling cabling and the second coiling cabling realize part and change sequence.
Referring to Fig. 6, in the specific embodiment of cross stranding connection, a1 connect with b2, and a2 is connected with b1, a3 with
B4 connection, a4 are connected with b3, and the first coiling cabling and the second coiling cabling realize and change sequence.
Referring to Fig. 7, in the specific embodiment of cross stranding connection, a1 connect with b4, and a2 is connected with b3, a3 with
B2 connection, a4 are connected with b1, and the first coiling cabling and the second coiling cabling realize and change sequence.
Referring to Fig. 8 and Fig. 9, (two layers of coil uses FPC plate 3 in the specific embodiment of cross stranding connection
Connection), a1 is connected with b2, and a2 is connected with b1, and a3 is connected with b3, and a4 is connected with b4, the first coiling cabling and the second coiling cabling
It realizes part and changes sequence.
Only four kinds of specific embodiments, in N=M, can be constructed more based on design of the invention above
More changes sequential mode, can also construct certainly, in the case of N ≠ M and more change sequential mode.
Embodiment 3
Conceived based on identical utility model, the utility model additionally provides a kind of wireless power transmitter, comprising: electric power hair
Sending coil portion, to transmit wirelessly electric power；And power supply, it powers to electric power transmit coil portion；Wherein, electric power transmit coil portion
Including the plane coiled wire-wound coil in embodiment 1 or 2；Power supply and external signal receiving unit are electrically connected, and pass through external signal
Receiving unit is powered to plane coiled wire-wound coil；Or power supply is directly supplied to plane coiled wire-wound coil as external signal receiving unit
Electricity.
Embodiment 4
Conceived based on identical utility model, the utility model additionally provides a kind of wireless power receiver, comprising: electric power connects
Coil part is received, to receive wireless power；And electric power switching part, to the received nothing in power device power conversion receiving coil portion
Line electric power；Wherein, power reception coil portion includes the plane coiled wire-wound coil in embodiment 1 or 2；Electric power switching part and external signal
Receiving unit is electrically connected, and the received wireless power in power reception coil portion is transmitted to electric power by external signal receiving unit and turns
Socket part；Or electric power switching part directly transmits the received wireless power in power reception coil portion as external signal receiving unit.
Embodiment 5
Conceived based on identical utility model, the utility model additionally provides a kind of near-field communication device, including embodiment 1 or 2
In plane coiled wire-wound coil.
Embodiment 6
Conceived based on identical utility model, the utility model additionally provides a kind of electronic equipment, including above-mentioned radio
Power transmitter, with wireless power sending function；And/or including above-mentioned wireless power receiver, with wireless power
Receive capabilities；And/or including above-mentioned near-field communication device, to have the function of near-field communication.
The embodiments of the present invention is explained in detail above in conjunction with attached drawing, but the utility model is not limited to
Above embodiment.Even if to the utility model, various changes can be made, if these variations belong to the utility model claims
And its within the scope of equivalent technologies, then still fall among the protection scope of the utility model.
Claims (12)
1. a kind of coil, the coil is plane coiled wire-wound coil, which is characterized in that including multilayer wire ring layer；The lattice coil
Wherein at least one layer of layer for by outer ring around to the First Line ring layer of inner ring, one layer for by inner ring around to the second coil layer of outer ring；
The First Line ring layer includes N stock the first coiling cabling；Second coil layer includes M stock the second coiling cabling；Wherein, N >=
2, M >=2；
The end of the end of the outer ring of the First Line ring layer and the outer ring of second coil layer and external signal receive single
Member connection；
The inner ring end of the First Line ring layer and the inner ring end of second coil layer are electrically connected；
Wherein, the First Line ring layer and second coil layer are glued together；Alternatively, the plane coiled wire-wound coil further includes
FPC plate, the First Line ring layer are formed in the upper face of the FPC plate, and second coil layer is formed under the FPC plate
Plate face.
2. coil as described in claim 1, which is characterized in that described in the inner ring end of N strands of the first coiling cablings and M strands
The inner ring end of second coiling cabling is integrally electrically connected.
3. coil as described in claim 1, which is characterized in that N=M, the inner ring end of the first coiling cabling with it is described
The inner ring end of second coiling cabling, which corresponds, to be electrically connected.
4. coil as described in claim 1, which is characterized in that N ≠ M, the inner ring end of part the first coiling cabling with
The inner ring end of part the second coiling cabling, which corresponds, to be electrically connected；
The inner ring end of remaining the first coiling cabling and the inner ring end entirety of the second coiling cabling described in remaining electrically connect
It connects.
5. coil as described in claim 3 or 4, which is characterized in that along inside to the outside of the plane coiled wire-wound coil
Direction, there are the inner ring end of i-th strand of the first coiling cabling only inner ring ends with jth stock the second coiling cabling
Electrical connection；And
It is only last with the inner ring of ' strands of jth the second coiling cablings that there are the inner ring ends of the i-th ' strands of the first coiling cabling
End electrical connection；
Wherein, 1≤i < i '≤N, 1≤j ' < j≤M.
6. coil as described in claim 1, which is characterized in that be adhesive in the First Line ring layer and second coil layer
In the case where together, the welding electrical connection of inner ring end or riveting of the inner ring end of the First Line ring layer and second coil layer
Connect electrical connection.
7. coil as described in claim 1, which is characterized in that the FPC plate is equipped with pad interconnecting piece, the first coil
The inner ring end of layer, the equal and described pad interconnecting piece in inner ring end of second coil layer are electrically connected.
8. coil as described in claim 1, which is characterized in that the diameter D1 of the first coiling cabling and second coiling
The diameter D2 of cabling meets following relationship:
D1≤3d；D2≤3d；
Wherein, d is skin depth of the plane cabling under the working frequency of the coil；F is the work frequency of the coil
Rate；μ is the magnetic conductivity of the coil cabling；For the conductivity of the coil cabling.
9. a kind of wireless power transmitter characterized by comprising
Electric power transmit coil portion, to transmit wirelessly electric power；And
Power supply, the power supply of Xiang Suoshu electric power transmit coil portion；
Wherein,
The electric power transmit coil portion includes the coil as described in claim 1-8 any one；
The power supply and the external signal receiving unit are electrically connected, and are put down by the external signal receiving unit to described
The power supply of face coiled wire-wound coil；Or
The power supply is directly powered to the plane coiled wire-wound coil as the external signal receiving unit.
10. a kind of receiver, the receiver is wireless power receiver characterized by comprising
Power reception coil portion, to receive the wireless power；And
Electric power switching part converts the received wireless power in power reception coil portion to power device；
Wherein,
The power reception coil portion includes the coil as described in claim 1-8 any one；
The electric power switching part and the external signal receiving unit are electrically connected, and the power reception coil portion is received wireless
Electric power is transmitted to the electric power switching part by the external signal receiving unit；Or
The electric power switching part directly transmits the received nothing in power reception coil portion as the external signal receiving unit
Line electric power.
11. a kind of near-field communication device, which is characterized in that including the coil as described in claim 1-8 any one.
12. a kind of electronic equipment, which is characterized in that wireless to have including wireless power transmitter as claimed in claim 9
Electric power sending function；And/or
Including receiver as claimed in claim 10, with wireless power receive capabilities；And/or
Including near-field communication device as claimed in claim 11, to have the function of near-field communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822115374.4U CN209641492U (en) | 2018-12-17 | 2018-12-17 | Coil, wireless power transmitter, receiver, near-field communication device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822115374.4U CN209641492U (en) | 2018-12-17 | 2018-12-17 | Coil, wireless power transmitter, receiver, near-field communication device and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN209641492U true CN209641492U (en) | 2019-11-15 |
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| CN201822115374.4U Active CN209641492U (en) | 2018-12-17 | 2018-12-17 | Coil, wireless power transmitter, receiver, near-field communication device and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109461571A (en) * | 2018-12-17 | 2019-03-12 | 上海安费诺永亿通讯电子有限公司 | Coil, wireless power transmitter, receiver, near-field communication device and electronic equipment |
-
2018
- 2018-12-17 CN CN201822115374.4U patent/CN209641492U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109461571A (en) * | 2018-12-17 | 2019-03-12 | 上海安费诺永亿通讯电子有限公司 | Coil, wireless power transmitter, receiver, near-field communication device and electronic equipment |
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