CN111092493A - Wireless power supply device - Google Patents
Wireless power supply device Download PDFInfo
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- CN111092493A CN111092493A CN201811281506.9A CN201811281506A CN111092493A CN 111092493 A CN111092493 A CN 111092493A CN 201811281506 A CN201811281506 A CN 201811281506A CN 111092493 A CN111092493 A CN 111092493A
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- coil
- ferrite core
- power supply
- wireless power
- supply apparatus
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- 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
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- 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
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
Abstract
The invention discloses a wireless power supply device, comprising: a first coil; and a second coil adapted to be electromagnetically coupled with the first coil. The first coil and the second coil have the same central axis, and one of the first coil and the second coil is freely rotatable around the central axis relative to the other. When one of the first coil and the second coil rotates around the central axis, the distance between the first coil and the second coil is kept unchanged, so that the electromagnetic coupling performance between the first coil and the second coil is kept unchanged. Therefore, the wireless power supply device can supply power to the electric product uninterruptedly and stably when the electric product rotates, so that the number of rotation turns of the electric product is not limited.
Description
Technical Field
The present invention relates to a wireless power supply device.
Background
In the prior art, some electric products are sometimes required to be freely rotated at any angle during work, for example, monitoring camera products. However, the existing monitoring camera products are usually electrically connected to the power source through a wired manner, which causes the number of rotation turns of the camera in the same direction to be greatly limited, and the camera can only rotate one turn or several turns. Therefore, the conventional camera must be reversely rotated back to the initial position after one or several rotations to prevent damage of the connection wire.
Disclosure of Invention
An object of the present invention is to solve at least one of the above problems and disadvantages in the prior art.
According to an aspect of the present invention, there is provided a wireless power supply apparatus including: a first coil; and a second coil adapted to be electromagnetically coupled with the first coil. The first coil and the second coil have the same central axis, and one of the first coil and the second coil is freely rotatable around the central axis relative to the other. When one of the first coil and the second coil rotates around the central axis, the distance between the first coil and the second coil is kept unchanged, so that the electromagnetic coupling performance between the first coil and the second coil is kept unchanged.
According to an exemplary embodiment of the present invention, the first coil and the second coil are in the shape of a flat circular ring, and the first coil is placed right above the second coil and spaced apart from the second coil by a predetermined distance in the axial direction.
According to another exemplary embodiment of the present invention, the first coil and the second coil are cylindrical, the first coil has an inner diameter larger than that of the second coil, and the second coil is placed in the first coil and spaced apart from the first coil by a predetermined distance in a radial direction.
According to another exemplary embodiment of the present invention, the first coil has a cylindrical shape, the second coil has a flat circular ring shape, an inner diameter of the first coil is larger than an outer diameter of the second coil, and the second coil is placed in the first coil and spaced apart from the first coil by a predetermined distance in a radial direction.
According to another exemplary embodiment of the present invention, the wireless powering device further comprises a first ferrite core, which together with the first coil constitutes one first coil assembly.
According to another exemplary embodiment of the present invention, the wireless powering device further comprises a second ferrite core, which together with the second coil constitutes a second coil assembly.
According to another exemplary embodiment of the present invention, the first ferrite core and the second ferrite core define a receiving cavity, and the first coil and the second coil are received in the receiving cavity such that the first coil and the second coil can be isolated from an external metal part by the first ferrite core and the second ferrite core.
According to another exemplary embodiment of the present invention, a gap is provided between the first ferrite core and the second ferrite core, and the gap between the first ferrite core and the second ferrite core is provided at a position avoiding the external metal part.
According to another exemplary embodiment of the present invention, at least one of the first ferrite core and the second ferrite core has a U-shaped or L-shaped cross section.
In the foregoing exemplary embodiments of the present invention, the first coil or the second coil may be freely rotated, and the distance between the first coil and the second coil is kept constant when the first coil or the second coil is rotated, so that the electromagnetic coupling performance between the first coil and the second coil is kept constant, and therefore, the wireless power supply device of the present invention can supply power to the electric product uninterruptedly and stably when the electric product is rotated, so that the number of rotation turns of the electric product is not limited.
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
Drawings
Fig. 1 shows a perspective view of a wireless power supply device according to a first embodiment of the invention;
fig. 2 is a partially enlarged schematic view of the wireless power supply apparatus shown in fig. 1;
FIG. 3 shows an alternative embodiment of the wireless power supply of FIG. 2;
FIG. 4 shows another alternate embodiment of the wireless power unit of FIG. 2;
fig. 5 is a perspective view of a wireless power supply device according to a second embodiment of the invention;
fig. 6 is a partially enlarged schematic view of the wireless power supply apparatus shown in fig. 5;
fig. 7 is a perspective view of a wireless power supply device according to a third embodiment of the invention;
fig. 8 is a partially enlarged schematic view of the wireless power supply apparatus shown in fig. 7.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
According to one general concept of the present invention, there is provided a wireless power supply apparatus including: a first coil; and a second coil adapted to be electromagnetically coupled with the first coil. The first coil and the second coil may be respectively mounted on a mechanical rotary shaft (not shown in the drawings) having the same central axis, and one of the first coil and the second coil may be freely rotatable about the central axis relative to the other. When one of the first coil and the second coil rotates around the central axis, the distance between the first coil and the second coil is kept unchanged, so that the electromagnetic coupling performance between the first coil and the second coil is kept unchanged.
First embodiment
Fig. 1 shows a perspective view of a wireless power supply device according to a first embodiment of the invention; fig. 2 is a partially enlarged schematic view of the wireless power supply apparatus shown in fig. 1.
As shown in fig. 1 and 2, in the illustrated embodiment, the wireless power supply device mainly includes a first coil 110 and a second coil 210. One of the first coil 110 and the second coil 210 is a transmitting coil, and the other is a receiving coil adapted for wireless electromagnetic coupling of the transmitting coil.
As shown in fig. 1 and 2, in the illustrated embodiment, the first coil 110 and the second coil 210 have a flat circular shape. The first coil 110 and the second coil 210 have the same central axis. The first coil 110 is placed directly above the second coil 210 and spaced apart from the second coil 210 by a predetermined distance in the axial direction.
As shown in fig. 1 and 2, in the illustrated embodiment, one of the first coil 110 and the second coil 210 is free to rotate relative to the other about a common central axis. When one of the first coil 110 and the second coil 210 rotates around the common central axis, the distance between the first coil 110 and the second coil 210 is kept constant, so that the electromagnetic coupling performance between the two is kept constant. Therefore, the wireless power supply device can supply power to the electric product uninterruptedly and stably when the electric product rotates, so that the number of rotation turns of the electric product is not limited.
As shown in fig. 1 and 2, in the illustrated embodiment, the first coil 110 and the second coil 210 may be identical. However, the present invention is not limited to the illustrated embodiment, and the first coil 110 and the second coil 210 may be different in size.
As shown in fig. 1 and 2, in the illustrated embodiment, the wireless power supply further includes a first ferrite core 120. The first ferrite core 120 forms a first coil assembly 100 together with the first coil 110.
As shown in fig. 1 and 2, in the illustrated embodiment, the wireless power supply further includes a second ferrite core 220. The second ferrite core 220 forms a second coil assembly 200 together with the second coil 210.
As shown in fig. 1 and 2, in the illustrated embodiment, first ferrite core 120 and second ferrite core 220 define a receiving cavity S. The first coil 110 and the second coil 210 are received in the receiving cavity S such that the first coil 110 and the second coil 210 can be isolated from the external metal member 300 (see fig. 3 and 4) by the first ferrite core 120 and the second ferrite core 220. In this way, the magnetic field generated by the transmitting coil in the wireless power supply device is limited in the accommodating cavity, and only very little magnetic field can leak to the outside of the first ferrite core and the second ferrite core, so that the eddy current effect on an external metal part (such as a metal outer shell) of the transmitting coil accessory can be greatly reduced, and the wireless power supply efficiency and stability are improved.
As shown in fig. 1 and 2, in the illustrated embodiment, first ferrite core 120 and second ferrite core 220 are U-shaped. In this way, the first coil 110 and the second coil 210 may be isolated from external metal components located on the top and bottom sides of the wireless power supply.
Fig. 3 shows a variation of the wireless power supply of fig. 2.
As shown in fig. 3, in the illustrated embodiment, the first coil 110 and the second coil 210 may be isolated from the external metal part 300 located at the top side and the outer side of the wireless power supply device by properly designing the shapes of the first ferrite core 120 and the second ferrite core 220. In the embodiment shown in fig. 3, the first ferrite core 120 and the second ferrite core 220 are L-shaped in cross-section.
As shown in fig. 3, in the illustrated embodiment, there is a gap g between the first ferrite core 120 and the second ferrite core 220, and the gap g between the first ferrite core 120 and the second ferrite core 220 is provided at a position avoiding the outer metal member 300. In the embodiment shown in fig. 3, the gap g between the first ferrite core 120 and the second ferrite core 220 is provided at the inner and bottom sides of the wireless power supply device, thereby avoiding the external metal parts 300 located at the top and outer sides of the wireless power supply device. Thus, the eddy current effect on the external metal part 300 can be further reduced, and the wireless power supply efficiency and stability can be improved.
Fig. 4 shows another variation of the wireless power supply apparatus shown in fig. 2.
As shown in fig. 4, in the illustrated embodiment, the first coil 110 and the second coil 210 may be isolated from the external metal parts 300 located at the top, inner, and outer sides of the wireless power supply device by properly designing the shapes of the first ferrite core 120 and the second ferrite core 220. In the embodiment shown in fig. 4, the first ferrite core 120 and the second ferrite core 220 are U-shaped in cross-section.
As shown in fig. 4, in the illustrated embodiment, there is a gap g between the first ferrite core 120 and the second ferrite core 220, and the gap g between the first ferrite core 120 and the second ferrite core 220 is provided at a position avoiding the outer metal member 300. In the embodiment shown in fig. 4, the gap g between the first ferrite core 120 and the second ferrite core 220 is disposed at the bottom side of the wireless power supply device, thereby avoiding the external metal parts 300 located at the top, inner and outer sides of the wireless power supply device. Thus, the eddy current effect on the external metal part 300 can be further reduced, and the wireless power supply efficiency and stability can be improved.
Second embodiment
Fig. 5 is a perspective view of a wireless power supply device according to a second embodiment of the invention; fig. 6 is a partially enlarged schematic view of the wireless power supply apparatus shown in fig. 5.
As shown in fig. 5 and 6, in the illustrated embodiment, the wireless power supply device mainly includes a first coil 110 and a second coil 210. One of the first coil 110 and the second coil 210 is a transmitting coil, and the other is a receiving coil adapted for wireless electromagnetic coupling of the transmitting coil.
As shown in fig. 5 and 6, in the illustrated embodiment, the first coil 110 and the second coil 210 are cylindrical. The first coil 110 and the second coil 210 have the same central axis. The inner diameter of the first coil 110 is larger than that of the second coil 210. The second coil 210 is placed in the first coil 110 and spaced apart from the first coil 110 by a predetermined distance in a radial direction.
As shown in fig. 5 and 6, in the illustrated embodiment, one of the first coil 110 and the second coil 210 is free to rotate relative to the other about a common central axis. When one of the first coil 110 and the second coil 210 rotates around the common central axis, the distance between the first coil 110 and the second coil 210 is kept constant, so that the electromagnetic coupling performance between the two is kept constant. Therefore, the wireless power supply device can supply power to the electric product uninterruptedly and stably when the electric product rotates, so that the number of rotation turns of the electric product is not limited.
As shown in fig. 5 and 6, in the illustrated embodiment, the wireless power supply further includes a first ferrite core 120. The first ferrite core 120 forms a first coil assembly 100 together with the first coil 110.
As shown in fig. 5 and 6, in the illustrated embodiment, the wireless power supply further includes a second ferrite core 220. The second ferrite core 220 forms a second coil assembly 200 together with the second coil 210.
As shown in fig. 5 and 6, in the illustrated embodiment, first ferrite core 120 and second ferrite core 220 define a receiving cavity S. The first coil 110 and the second coil 210 are received in the receiving cavity S such that the first coil 110 and the second coil 210 can be isolated from the external metal member 300 (see fig. 3 and 4) by the first ferrite core 120 and the second ferrite core 220. In this way, the magnetic field generated by the transmitting coil in the wireless power supply device is limited in the accommodating cavity, and only very little magnetic field can leak to the outside of the first ferrite core and the second ferrite core, so that the eddy current effect on an external metal part (such as a metal outer shell) of the transmitting coil accessory can be greatly reduced, and the wireless power supply efficiency and stability are improved.
As shown in fig. 5 and 6, in the illustrated embodiment, first ferrite core 120 and second ferrite core 220 are U-shaped. In this way, the first and second coils 110 and 210 can be isolated from external metal parts located inside and outside the wireless power supply device.
Third embodiment
Fig. 7 is a perspective view of a wireless power supply device according to a third embodiment of the invention; fig. 8 is a partially enlarged schematic view of the wireless power supply apparatus shown in fig. 7.
As shown in fig. 7 and 8, in the illustrated embodiment, the wireless power supply device mainly includes a first coil 110 and a second coil 210. One of the first coil 110 and the second coil 210 is a transmitting coil, and the other is a receiving coil adapted for wireless electromagnetic coupling of the transmitting coil.
As shown in fig. 7 and 8, in the illustrated embodiment, the first coil 110 has a cylindrical shape, and the second coil 210 has a flat circular ring shape. The first coil 110 and the second coil 210 have the same central axis. The inner diameter of the first coil 110 is larger than the outer diameter of the second coil 210. The second coil 210 is placed in the first coil 110 and spaced apart from the first coil 110 by a predetermined distance in a radial direction.
As shown in fig. 7 and 8, in the illustrated embodiment, one of the first coil 110 and the second coil 210 is free to rotate relative to the other about a common central axis. When one of the first coil 110 and the second coil 210 rotates around the common central axis, the distance between the first coil 110 and the second coil 210 is kept constant, so that the electromagnetic coupling performance between the two is kept constant. Therefore, the wireless power supply device can supply power to the electric product uninterruptedly and stably when the electric product rotates, so that the number of rotation turns of the electric product is not limited.
As shown in fig. 7 and 8, in the illustrated embodiment, the wireless power supply further includes a first ferrite core 120. The first ferrite core 120 forms a first coil assembly 100 together with the first coil 110.
As shown in fig. 7 and 8, in the illustrated embodiment, the wireless power supply further includes a second ferrite core 220. The second ferrite core 220 forms a second coil assembly 200 together with the second coil 210.
As shown in fig. 7 and 8, in the illustrated embodiment, the first ferrite core 120 and the second ferrite core 220 define a receiving cavity S. The first coil 110 and the second coil 210 are received in the receiving cavity S such that the first coil 110 and the second coil 210 can be isolated from the external metal member 300 (see fig. 3 and 4) by the first ferrite core 120 and the second ferrite core 220. In this way, the magnetic field generated by the transmitting coil in the wireless power supply device is limited in the accommodating cavity, and only very little magnetic field can leak to the outside of the first ferrite core and the second ferrite core, so that the eddy current effect on an external metal part (such as a metal outer shell) of the transmitting coil accessory can be greatly reduced, and the wireless power supply efficiency and stability are improved.
As shown in fig. 7 and 8, in the illustrated embodiment, the first ferrite core 120 and the second ferrite core 220 are L-shaped. In this way, the first and second coils 110 and 210 may be isolated from external metal components located on the outside and bottom side of the wireless power supply device.
It will be appreciated by those skilled in the art that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of preferred embodiments of the present invention and should not be construed as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the appended claims and their equivalents.
It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude a plurality. Furthermore, any reference signs in the claims shall not be construed as limiting the scope of the invention.
Claims (9)
1. A wireless power supply, comprising:
a first coil (110); and
a second coil (210) adapted to be electromagnetically coupled with the first coil (110),
the method is characterized in that:
the first coil (110) and the second coil (210) having a common central axis, one of the first coil (110) and the second coil (210) being freely rotatable relative to the other about the central axis,
when one of the first coil (110) and the second coil (210) rotates around the central axis, the distance between the first coil (110) and the second coil (210) is kept unchanged, so that the electromagnetic coupling performance between the two is kept unchanged.
2. The wireless power supply apparatus according to claim 1, wherein:
the first coil (110) and the second coil (210) are in the shape of a flat circular ring, and the first coil (110) is placed directly above the second coil (210) and spaced apart from the second coil (210) by a predetermined distance in the axial direction.
3. The wireless power supply apparatus according to claim 1, wherein:
the first coil (110) and the second coil (210) are cylindrical, an inner diameter of the first coil (110) is larger than an inner diameter of the second coil (210), and the second coil (210) is placed in the first coil (110) and spaced apart from the first coil (110) by a predetermined distance in a radial direction.
4. The wireless power supply apparatus according to claim 1, wherein:
the first coil (110) is cylindrical, the second coil (210) is flat and circular, the inner diameter of the first coil (110) is larger than the outer diameter of the second coil (210), and the second coil (210) is placed in the first coil (110) and spaced apart from the first coil (110) by a predetermined distance in the radial direction.
5. The wireless power supply apparatus according to any one of claims 1 to 4, wherein:
the wireless power supply further comprises a first ferrite core (120), the first ferrite core (120) and the first coil (110) together forming a first coil assembly (100).
6. The wireless power supply apparatus according to claim 5, wherein:
the wireless power supply device further comprises a second ferrite core (220), the second ferrite core (220) and the second coil (210) together forming a second coil assembly (200).
7. The wireless power supply apparatus according to claim 6, wherein:
the first ferrite core (120) and the second ferrite core (220) define a receiving cavity (S) in which the first coil (110) and the second coil (210) are received such that the first coil (110) and the second coil (210) can be isolated from an external metal part (300) by the first ferrite core (120) and the second ferrite core (220).
8. The wireless power supply apparatus according to claim 7, wherein:
the first ferrite core (120) and the second ferrite core (220) have a gap (g) therebetween, and the gap (g) between the first ferrite core (120) and the second ferrite core (220) is provided at a position avoiding the external metal component (300).
9. The wireless power supply apparatus according to claim 7, wherein:
at least one of the first ferrite core (120) and the second ferrite core (220) has a U-shaped or L-shaped cross section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811281506.9A CN111092493A (en) | 2018-10-23 | 2018-10-23 | Wireless power supply device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811281506.9A CN111092493A (en) | 2018-10-23 | 2018-10-23 | Wireless power supply device |
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| CN111092493A true CN111092493A (en) | 2020-05-01 |
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| CN201811281506.9A Pending CN111092493A (en) | 2018-10-23 | 2018-10-23 | Wireless power supply device |
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| US11482890B2 (en) | 2020-04-30 | 2022-10-25 | Nucurrent, Inc. | Surface mountable wireless power transmitter for transmission at extended range |
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| US11482890B2 (en) | 2020-04-30 | 2022-10-25 | Nucurrent, Inc. | Surface mountable wireless power transmitter for transmission at extended range |
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| US11757313B2 (en) | 2020-04-30 | 2023-09-12 | Nucurrent, Inc. | Operating frequency based power level altering in extended range wireless power transmitters |
| US11831179B2 (en) | 2020-12-23 | 2023-11-28 | Nucurrent, Inc. | Wireless power transmitters and associated base stations for transmitting power at extended separation distances |
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