CN218920066U - Device for improving magnetic induction coupling distance - Google Patents
Device for improving magnetic induction coupling distance Download PDFInfo
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- CN218920066U CN218920066U CN202223317317.7U CN202223317317U CN218920066U CN 218920066 U CN218920066 U CN 218920066U CN 202223317317 U CN202223317317 U CN 202223317317U CN 218920066 U CN218920066 U CN 218920066U
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- relay coil
- shielding layer
- circuit board
- coupling distance
- magnetic induction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model discloses a device for improving magnetic induction coupling distance, which comprises a first shielding layer, a first relay coil unit, a circuit board, a second relay coil unit, a second shielding layer and a matching capacitor, wherein the first shielding layer is arranged on the circuit board; the first shielding layer, the first relay coil unit, the circuit board, the second relay coil unit and the second shielding layer are sequentially arranged from top to bottom; the matching capacitor is arranged on the circuit board; the first relay coil unit and the second relay coil unit are formed by connecting a plurality of coils in series. The device reduces the over coupling between the device and the transmitting antenna through the reverse winding of the inner coil and the outer coil, and meanwhile, the device increases the coupling distance of magnetic induction.
Description
Technical Field
The utility model belongs to the technical field of wireless power transmission, and particularly relates to a device for improving magnetic induction coupling distance.
Background
With the continuous development of electronic information technology and automation control technology, various home appliances, consumer electronics, mobile communication devices and the like have been widely popularized, however, conventional home appliances rely on wired connection between a power cord and a power socket to realize power supply, and electronic devices employing built-in batteries also need wired connection between a charging cord and the power socket to be charged, so that we can see the wires for supplying power to these electronic devices everywhere. These wires not only occupy our active space, limiting the convenience of the device use, but also create the potential safety hazard of electricity use. Therefore, with the increasing demands of people for portable devices and green energy systems that can be used completely wirelessly, research and application of wireless energy transmission technology is rapidly becoming the focus of academia and industry at home and abroad. Currently, the wireless charging technology accepted in the industry is mainly divided into three types, namely a QI standard of WPC alliance initiative, a magnetic resonance coupling technology of Airfuel alliance initiative, and an electromagnetic radiation type wireless energy transmission technology. Of the three technologies, magnetic induction technology has evolved earlier and has found more mature commercial application in the consumer electronics field. However, due to the tight coupling characteristic of the magnetic induction technology, the magnetic induction wireless charging technology for consumer electronics devices disclosed at present has the defect of short transmission distance, and the transmission efficiency is higher when the vertical distance between the transceiver antennas is very short, but the transmission efficiency is drastically reduced along with the increase of the vertical distance between the transceiver antennas, especially when the size difference between the transceiver antennas is large, the transmission efficiency is obviously reduced.
Disclosure of Invention
The utility model provides a device for improving magnetic induction coupling distance, which aims to solve the problems of short transmission distance and over coupling between a relay antenna and a receiving antenna in the magnetic induction wireless charging technology.
The technical scheme of the utility model is as follows: the device for improving the magnetic induction coupling distance comprises a first shielding layer, a first relay coil unit, a circuit board, a second relay coil unit, a second shielding layer and a matching capacitor;
the first shielding layer, the first relay coil unit, the circuit board, the second relay coil unit and the second shielding layer are sequentially arranged from top to bottom; the matching capacitor is arranged on the circuit board; the first relay coil unit and the second relay coil unit are formed by connecting a plurality of coils in series.
Further, the first relay coil unit includes a first relay coil and a second relay coil located on the same plane;
the end point of the outermost turn of the second relay coil is connected with the end point of the innermost turn of the first relay coil; the first relay coil and the second relay coil are arranged above the circuit board; the first shielding layer is arranged above the first relay coil and the second relay coil.
Further, the second relay coil unit includes a third relay coil and a fourth relay coil located on the same plane;
the end point of the outermost turn of the fourth relay coil is connected with the end point of the innermost turn of the third relay coil; the third relay coil and the fourth relay coil are arranged below the circuit board; the second shielding layer is arranged below the third relay coil and the fourth relay coil;
the end point of the outermost turn of the first relay coil is connected with the third relay coil through a via hole; the second relay coil is connected with the fourth relay coil through a via hole and a matching capacitor.
Further, the first relay coil and the first shielding layer are the same in size; the first shielding layer is provided with a round hole with the same size as the second relay coil.
Further, the second shielding layer and the fourth relay coil are the same size.
Further, the winding directions of the first relay coil and the second relay coil are opposite; the line width of the first relay coil is larger than that of the second relay coil.
Further, the winding directions of the third relay coil and the fourth relay coil are opposite; the line width of the third relay coil is larger than that of the fourth relay coil.
The beneficial effects of the utility model are as follows: the device reduces the over coupling between the device and the transmitting antenna through the reverse winding of the inner coil and the outer coil, and meanwhile, the device increases the coupling distance of magnetic induction. The upper layer and the lower layer are connected in series to effectively increase the inductance value of the whole coil, so that the coupling coefficient of the device and a transmitting antenna is increased, the line width and the line diameter of the internal coil are reduced, the number of turns of the internal coil is increased under the condition that the area of the internal coil is not increased, and the coupling coefficient between the device and a receiving antenna is further increased.
Drawings
FIG. 1 is a block diagram of an apparatus for increasing magnetic inductive coupling distance;
FIG. 2 is a top view of an apparatus for increasing magnetic inductive coupling distance;
FIG. 3 is a bottom view of an apparatus for increasing magnetic inductive coupling distance;
FIG. 4 is a top view of the device without the first and second shield layers;
FIG. 5 is a bottom view of the device without the first and second shield layers;
fig. 6 is a cross-sectional view showing the connection of the first relay coil and the third relay coil;
fig. 7 is a diagram of an equivalent circuit of a coil structure;
in the figure, 101, a first relay coil; 102. a second relay coil; 103. a third relay coil; 104. a fourth relay coil; 105. a first shielding layer; 106. a second shielding layer; 107. matching the capacitance; 108. a circuit board; 201. an outer turn end point of the first relay coil; 202. a third relay coil outer turn end point; 203. and (5) a via hole.
Detailed Description
Embodiments of the present utility model are further described below with reference to the accompanying drawings.
As shown in fig. 1, the present utility model provides a device for improving magnetic induction coupling distance, which includes a first shielding layer 105, a first relay coil unit, a circuit board 108, a second relay coil unit, a second shielding layer 106 and a matching capacitor 107;
the first shielding layer 105, the first relay coil unit, the circuit board 108, the second relay coil unit, and the second shielding layer 106 are sequentially disposed from top to bottom; the matching capacitor 107 is disposed on the circuit board 108; the first relay coil unit and the second relay coil unit are formed by connecting a plurality of coils in series.
In the embodiment of the present utility model, as shown in fig. 1, the first relay coil unit includes a first relay coil 101 and a second relay coil 102 located on the same plane;
the end point of the outermost turn of the second relay coil 102 is connected with the end point of the innermost turn of the first relay coil 101; the first relay coil 101 and the second relay coil 102 are disposed above the circuit board 108; the first shielding layer 105 is disposed above the first relay coil 101 and the second relay coil 102.
In the embodiment of the present utility model, as shown in fig. 1, the second relay coil unit includes a third relay coil 103 and a fourth relay coil 104 located on the same plane;
the end point of the outermost turn of the fourth relay coil 104 is connected with the end point of the innermost turn of the third relay coil 103; the third relay coil 103 and the fourth relay coil 104 are disposed below the circuit board 108; the second shielding layer 106 is disposed below the third relay coil 103 and the fourth relay coil 104;
the end point of the outermost turn of the first relay coil 101 is connected with the third relay coil 103 through a via hole; the second relay coil 102 is connected to the fourth relay coil 104 through a via and a matching capacitor 107.
In the embodiment of the present utility model, as shown in fig. 1, the first relay coil 101 and the first shielding layer 105 are the same in size; the first shield layer 105 is provided with a circular hole having the same size as the second relay coil 102.
In the embodiment of the present utility model, as shown in fig. 1, the second shielding layer 106 and the fourth relay coil 104 have the same size.
In the embodiment of the present utility model, as shown in fig. 1, the winding directions of the first relay coil 101 and the second relay coil 102 are opposite; the linewidth of the first relay coil 101 is larger than that of the second relay coil 102.
In the embodiment of the present utility model, as shown in fig. 1, the winding directions of the third relay coil 103 and the fourth relay coil 104 are opposite; the line width of the third relay coil 103 is larger than that of the fourth relay coil 104.
In the embodiment of the present utility model, as shown in fig. 2, the first shielding layer 105 is used to shield the influence of the metal above on the electrical parameters of the coil below, and increase the inductance value of the whole coil, and the central hole enables most of the magnetic force lines emitted by the second relay coil 102 and the fourth relay coil 104 to pass through and couple with the receiving antenna above, and at the same time, part of the magnetic force lines emitted by the first relay coil 101 and the third relay coil 103 can pass through the central hole of the first shielding layer and the receiving antenna above.
In the embodiment of the present utility model, as shown in fig. 3, the size of the second shielding layer 106 is equal to the size of the fourth relay coil 104, and is equal to the size of the center hole of the first shielding layer 105, the second shielding layer 106 can shield most of the magnetic lines of force emitted by the first relay coil 101 and the third relay coil 103, so as to reduce the coupling coefficient between the whole additional device and the receiving antenna above to solve the problem of over-coupling between part of the additional device and the receiving antenna, and meanwhile, the second shielding layer 105 can make the magnetic lines of force emitted by the second relay coil 102 and the fourth relay coil 104 more concentrated at the centers of the second relay coil 102 and the fourth relay coil 104, thereby increasing the coupling distance between the additional device and the receiving antenna.
In the embodiment of the present utility model, as shown in fig. 4, the directions of the windings 102 of the first relay coil 101 and the second relay coil 102 are opposite, so that the directions of magnetic lines of force of a magnetic field formed around the windings by the currents in the first relay coil 101 and the second relay coil 102 are opposite, and the magnetic lines of force of the magnetic field formed by the currents around the windings are opposite, so that part of the magnetic lines of force of the first relay coil 101 and the third relay coil 103 can be offset by the magnetic lines of force of the second relay coil 102 and the fourth relay coil 104, and the coupling coefficient between the additional device and the transmitting antenna is reduced to solve the problem of over coupling between the transmitting antenna and the additional device; meanwhile, the line width of the second relay coil 102 is smaller than that of the first relay coil 101, so that the second relay coil 102 can be wound with more turns under the condition of the same size, and the coupling coefficient between the second relay antenna 102 and the receiving antenna is increased.
In the embodiment of the present utility model, as shown in fig. 5, the winding directions of the third relay coil 103 and the fourth relay coil 104 are opposite, so that the directions of magnetic lines of force of a magnetic field formed by the currents around the coils in the third relay coil 103 and the fourth relay coil 104 are opposite, and the magnetic lines of force of the magnetic field generated by the second relay coil 102 and the fourth relay coil 104 can cancel part of the magnetic lines of force generated by the first relay coil 101 and the third relay coil 103, thereby reducing the coupling coefficient between the additional device and the transmitting antenna to solve the problem of over-coupling between the transmitting antenna and the additional device; meanwhile, the line width of the fourth relay coil 104 is smaller than that of the third relay coil 103, so that the fourth relay coil 104 can be wound with more turns under the condition of the same size, and the coupling coefficient between the fourth relay antenna 104 and the receiving antenna is increased.
In the embodiment of the present utility model, as shown in fig. 6, a first relay coil outer turn end 201, a third relay coil outer turn end 202, and a via 203 for connecting the outer end of the first relay coil 101 and the outer end of the fourth relay coil 104 are provided; the first relay coil 101 and the third relay coil 103 have the same winding mode, and the directions of the currents on the two coils are the same; if the current flows in the first relay coil 101 as a solid line, the current also flows in the third relay wire 103 as a solid line; if the current flows in the first relay coil 101 as a broken line, the current also flows in the third relay wire 103 as a broken line.
In the embodiment of the present utility model, the first relay coil 101, the second relay coil 102, the third relay coil 103 and the fourth relay coil 104 are connected in series through the matching capacitor 107 to form a closed loop, wherein the winding directions of the first relay coil 101 and the second relay coil 102 are opposite, and the winding directions of the third relay coil 103 and the fourth relay coil 104 are opposite; the inner turn end of the second relay coil 102 and the inner turn end of the fourth relay coil 104 are connected in series by a matching capacitor.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present utility model and should be understood that the scope of the utility model is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (7)
1. A device for improving magnetic induction coupling distance is characterized by comprising a first shielding layer (105), a first relay coil unit, a circuit board (108), a second relay coil unit, a second shielding layer (106) and a matching capacitor (107);
the first shielding layer (105), the first relay coil unit, the circuit board (108), the second relay coil unit and the second shielding layer (106) are sequentially arranged from top to bottom; the matching capacitor (107) is arranged on the circuit board (108); the first relay coil unit and the second relay coil unit are formed by connecting a plurality of coils in series.
2. The apparatus for increasing magnetic induction coupling distance according to claim 1, wherein the first relay coil unit includes a first relay coil (101) and a second relay coil (102) located on the same plane;
the end point of the outermost turn of the second relay coil (102) is connected with the end point of the innermost turn of the first relay coil (101); the first relay coil (101) and the second relay coil (102) are arranged above the circuit board (108); the first shielding layer (105) is arranged above the first relay coil (101) and the second relay coil (102).
3. The apparatus for increasing magnetic induction coupling distance according to claim 2, wherein the second relay coil unit includes a third relay coil (103) and a fourth relay coil (104) located on the same plane;
the end point of the outermost turn of the fourth relay coil (104) is connected with the end point of the innermost turn of the third relay coil (103); the third relay coil (103) and the fourth relay coil (104) are arranged below the circuit board (108); the second shielding layer (106) is arranged below the third relay coil (103) and the fourth relay coil (104);
the end point of the outermost turn of the first relay coil (101) is connected with a third relay coil (103) through a via hole; the second relay coil (102) is connected with the fourth relay coil (104) through a via hole and a matching capacitor (107).
4. The apparatus for increasing magnetic inductive coupling distance according to claim 2, characterized in that the first relay coil (101) and the first shielding layer (105) are of the same size; the first shielding layer (105) is provided with a round hole with the same size as the second relay coil (102).
5. A device for increasing the magnetic inductive coupling distance according to claim 3, characterized in that the second shielding layer (106) and the fourth relay coil (104) are of the same size.
6. The apparatus for increasing the magnetic induction coupling distance according to claim 2, wherein the winding directions of the first relay coil (101) and the second relay coil (102) are opposite; the line width of the first relay coil (101) is larger than that of the second relay coil (102).
7. A device for increasing magnetic induction coupling distance according to claim 3, characterized in that the winding directions of the third relay coil (103) and the fourth relay coil (104) are opposite; the line width of the third relay coil (103) is larger than that of the fourth relay coil (104).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223317317.7U CN218920066U (en) | 2022-12-07 | 2022-12-07 | Device for improving magnetic induction coupling distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223317317.7U CN218920066U (en) | 2022-12-07 | 2022-12-07 | Device for improving magnetic induction coupling distance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218920066U true CN218920066U (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223317317.7U Active CN218920066U (en) | 2022-12-07 | 2022-12-07 | Device for improving magnetic induction coupling distance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218920066U (en) |
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2022
- 2022-12-07 CN CN202223317317.7U patent/CN218920066U/en active Active
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