CN106953426B - Novel wireless power transmission omnidirectional three-dimensional transmitting coil device - Google Patents
Novel wireless power transmission omnidirectional three-dimensional transmitting coil device Download PDFInfo
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Abstract
The invention discloses a novel wireless power transmission omnidirectional three-dimensional transmitting coil device, which takes a three-dimensional structure as a bearing mechanism of a transmitting coil; placing a planar spiral coil on each face; the transmitting device can improve the degree of freedom and flexibility of a wireless electric energy transmission system, improve the spatial uniformity of a magnetic field of the transmission system, reduce the dependence of a receiving system on the transmitting system, and realize stable electric energy transmission of the receiving device of a single-source multi-load system and any spatial position.
Description
Technical Field
The invention belongs to the field of wireless power transmission, and particularly relates to a novel wireless power transmission omnidirectional three-dimensional transmitting coil device.
Background
Since 1840, it was discovered that electric energy can be transmitted by utilizing electromagnetic induction phenomenon and wires, the transmission of electric energy is mainly performed by directly contacting wires. The electrical equipment is generally charged by a plug and a socket, but when high-power charging is carried out, the charging mode has the risk of high-voltage electric shock. And because of friction and abrasion, the safety, reliability and service life of the system are low, and large accidents are easily caused particularly in the flammable and explosive fields of chemical engineering, mining and the like. The novel non-contact electric energy transmission system combines an electromagnetic induction principle, a power electronic technology and a control theory, realizes wireless transmission of electric energy, and completely overcomes the limitations. According to the principle of power transmission, wireless power transmission can be roughly classified into three categories: the first is the direct coupling of the transformer principle, which, although powerful, is suitable only for short distances; the second type of radio wave energy transmission technology directly utilizes the principle that electromagnetic wave energy can be transmitted and received through an antenna, and the mode realizes long-distance and high-power energy transmission, but the energy transmission is limited by direction, cannot bypass barriers, has large loss and seriously damages human bodies and other organisms; the third type is a non-radiative coupling resonance mode, which can transmit in the presence of obstacles, has a relatively long transmission distance and relatively high transmission power, and is harmless to human bodies.
In 2007, the MIT researchers realized the medium-range wireless transmission of electric energy in a high-frequency electromagnetic resonance coupling manner, and the efficiency was about 40% when the 60W bulb was powered at a distance of 2 m. The great progress stimulates the interest of domestic and foreign researchers in the magnetic coupling resonant wireless power transmission technology, and numerous scholars carry out deep research on the aspects of improving the transmission power and efficiency, the transmission distance and the like. The wireless power transmission technology is limited in two aspects of power transmission efficiency and stability in the application process, namely, the problem of transmission stability caused by the change of the space positions of a transmitting coil and a receiving coil; and secondly, the volume of the wireless power transmission system is expected to be as small as possible on the premise of ensuring stable transmission. In a conventional wireless power transmission system, a receiving coil and a transmitting coil are sensitive to directions, sufficient transmission power can be obtained in a single direction, but the transmission power is sharply reduced when the direction is changed, so that the receiving coil and the transmitting coil are mostly placed in parallel. However, in practical applications, for a single-source multi-load system and a receiving mechanism in any spatial position, the relative spatial relationship between the receiving coil and the magnetic field changes, and the plane normal direction of the receiving coil is not parallel or even perpendicular to the direction of the magnetic field, so that the transmission characteristics in the receiving coil change along with the change of the angle between the plane normal directions of the two coils, and the transmission stability of the system is reduced. If the energy is stably transmitted under any spatial position condition, the volumes of the transmitting coil and the receiving coil are increased.
At present, researches on improvement of transmission stability in any space are mostly limited in a two-dimensional plane, and research results on flexible and stable transmission in a three-dimensional space also have many disadvantages, for example, although multi-directional stable electric energy transmission is realized by a non-coaxial domino resonant coil array and a self-rotating transmitting coil device, flexibility and controllability are limited by a plurality of relay coils and a complex structure, and transmission stability in any direction is not fundamentally improved.
How to reduce the system volume and realize omnidirectional power transmission under the condition of meeting the requirement of stably transmitting energy becomes the key for improving the performance of the wireless power transmission system.
Disclosure of Invention
In order to solve the problems, the invention provides a novel wireless power transmission omnidirectional three-dimensional transmitting coil device, which can improve the degree of freedom and flexibility of a wireless power transmission system, improve the spatial uniformity of a magnetic field of the transmission system, reduce the dependence of a receiving system on the transmitting system, and realize the stable power transmission of the receiving device of a single-source multi-load system and any spatial position.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: a novel wireless power transmission omnidirectional three-dimensional transmitting coil device takes a three-dimensional structure as a bearing mechanism of a transmitting coil; the three-dimensional structure is a polyhedron, and each face of the polyhedron is provided with a planar spiral coil; the planar spiral coil comprises a single-turn exciting coil and a multi-turn transmitting coil which jointly form an electromagnetic transmitting part; the single-turn exciting coil is connected in parallel or in series with a high-frequency power supply.
Furthermore, in the planar spiral coil, a single-turn excitation coil is positioned in the center of the plane, a multi-turn transmitting coil is positioned on the periphery of the single-turn excitation coil, and the geometric center of each turn of coil is positioned at the same point.
Furthermore, in the planar spiral coil, a multi-turn transmitting coil is positioned in the center of the plane, a single-turn exciting coil is positioned on the periphery of the multi-turn transmitting coil, and the geometric center of each turn of coil is positioned at the same point.
Further, in the planar spiral coil, each turn of the coil is polygonal or circular.
Still further, in the planar spiral coil, each turn of the coil is a polygon corresponding to the surface where the coil is located.
Further, the three-dimensional structure is a regular polyhedron.
Further, the three-dimensional structure is a three-dimensional sphere composed of polygons.
Furthermore, the three-dimensional structure is a hollow structure, so that the electromagnetic emission part is conveniently connected with a lead.
Further, the high-frequency power supply is arranged on the base.
Compared with the prior art, the novel wireless power transmission omnidirectional three-dimensional transmitting coil device has the advantages that the limitation that the traditional coil structure adopted by the prior art has direction sensitivity is overcome, the three-dimensional structure is adopted, the transmitting coil with the three-dimensional structure can meet the requirements of a single-source multi-load power supply system, the requirement of high-freedom-degree movement of a receiving device is met, the stability of energy transmission at any angle can be ensured, the system size is reduced, and the omnidirectional three-dimensional transmitting coil device is suitable for supplying power to moving equipment at any spatial position.
Drawings
Fig. 1 is a schematic diagram of a novel wireless power transmission omnidirectional three-dimensional regular dodecahedron transmitting coil device;
FIG. 2 is a schematic diagram of a novel wireless power transmission omnidirectional three-dimensional sphere transmitting coil device;
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
According to the novel omnidirectional three-dimensional transmitting coil device for wireless power transmission, a three-dimensional structure is selected as a bearing mechanism of the transmitting coil, and the three-dimensional structure has symmetry and stability and is favorable for realizing multi-directional stable power transmission.
The three-dimensional structure can be a polyhedron, each face is a corresponding polygon, a planar spiral coil is respectively placed on each face, a single-turn polygonal exciting coil is arranged at the center or the periphery of the plane and forms an electromagnetic transmitting part together with a peripheral or central multi-turn transmitting coil, each turn of the electromagnetic transmitting part is polygonal or circular, the geometric center of each turn of the coil is located at the same point, and all turns of the coil in the same plane are located in the same plane.
The single-turn exciting coils on each surface are connected in parallel or in series with a high-frequency power supply arranged on the base.
The three-dimensional structure is set as a hollow structure, so that the connection between the transmitting device and the lead is facilitated.
The three-dimensional structure can be a regular polyhedron such as a regular tetrahedron, a regular hexahedron, a regular octahedron, a regular dodecahedron, a regular icosahedron and the like, and can also be a three-dimensional structure body formed by one or more polygons, even a sphere.
The spiral flat coil on each surface can be a polygon corresponding to the corresponding polyhedron or a flat spiral circular coil.
Under the condition that the effective area of each surface is fixed, and the structure, the size and the resonant frequency of the flat coil of each surface are fixed, the more the surfaces of the polyhedron are, the higher the degree of freedom of the transmission direction of the transmitting coil is, and the more uniform the distribution of the emitted magnetic field is.
Fig. 1 and fig. 2 are taken as examples of specific applications in the following:
example 1
As shown in fig. 1, the present embodiment provides a novel omnidirectional three-dimensional regular dodecahedron transmitting coil device for wireless power transmission, where the regular dodecahedron includes 12 regular pentagons, and each of the regular pentagons is a corresponding regular pentagon.
The planar spiral coil is placed on each surface, the regular pentagonal exciting coil with a single turn is arranged in the center, the regular pentagonal exciting coil and the peripheral multi-turn transmitting coil form an electromagnetic transmitting part together, each turn of the electromagnetic transmitting part is regular pentagonal, the geometric center of each turn of the electromagnetic transmitting part is located at the same point, and all turns of the electromagnetic transmitting part are located in the same plane.
The regular dodecahedron is set to be a hollow structure, so that the connection between the transmitting device and other conducting wires is facilitated.
Example 2
As shown in fig. 2, the present embodiment provides a novel omnidirectional three-dimensional sphere transmitting coil device for wireless power transmission. The three-dimensional structure of the sphere can be a regular polyhedron, the number of polygonal sides of each surface is the same, and the larger the number of sides is, the closer the sphere is; it can also be a three-dimensional sphere composed of multiple polygons, and this embodiment uses a football-like geometry composed of regular hexagons and regular pentagons.
Place plane spiral coil respectively in every face, in the regular hexagon face, the regular hexagon excitation coil that sets up single turn is located the center, constitute electromagnetic emission part jointly with the transmitting coil of peripheral multiturn, its every circle all is regular hexagon, in the regular pentagon face, the regular pentagon excitation coil that sets up single turn is located the center, constitute electromagnetic emission part jointly with the transmitting coil of peripheral multiturn, its every circle all is regular pentagon, the geometric center of every circle coil all is located the same point, all circle coils all are located the coplanar in the coplanar.
The three-dimensional sphere is set to be a hollow structure, so that the connection between the launching device and other wires is facilitated.
It should be noted that in both embodiment 1 and embodiment 2, the single-turn excitation coil is located at the center of the plane, and the multi-turn transmitting coil is located at the periphery of the single-turn excitation coil; a multi-turn transmitting coil can be positioned in the center of a plane, a single-turn exciting coil is positioned on the periphery of the multi-turn transmitting coil, and the geometric center of each turn of coil is positioned at the same point.
In addition, in the embodiment 1 and the embodiment 2, each turn of the coil is a polygon corresponding to the surface where the turn is located; the technical scheme that each turn of the coil is circular or other polygons can also be adopted.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A novel wireless power transmission omnidirectional three-dimensional transmitting coil device is characterized in that a three-dimensional structure is used as a bearing mechanism of a transmitting coil; the three-dimensional structure is a polyhedron with symmetry and stability, and each surface of the polyhedron is provided with a planar spiral coil; the planar spiral coil comprises a single-turn exciting coil and a multi-turn transmitting coil which jointly form an electromagnetic transmitting part; the single-turn exciting coil is connected in parallel or in series with a high-frequency power supply;
the three-dimensional structure is a three-dimensional sphere consisting of polygons, and the emitted magnetic field is distributed uniformly;
the effective area of each surface is fixed, and the structure, the size and the resonant frequency of the planar spiral coil of each surface are fixed;
in the planar spiral coil, a single-turn excitation coil is positioned in the center of a plane, a multi-turn transmitting coil is positioned on the periphery of the single-turn excitation coil, and the geometric center of each turn of coil is positioned at the same point;
or: in the planar spiral coil, a multi-turn transmitting coil is positioned in the center of a plane, a single-turn exciting coil is positioned on the periphery of the multi-turn transmitting coil, and the geometric center of each turn of coil is positioned at the same point;
in the planar spiral coil, each turn of coil is polygonal or circular; or each turn of the coil is a polygon corresponding to the surface.
2. The novel omnidirectional three-dimensional transmitting coil device for wireless power transmission according to claim 1, wherein the three-dimensional structure is a regular polyhedron.
3. The novel omnidirectional three-dimensional transmitting coil device for wireless power transmission according to claim 1, wherein the three-dimensional structure is a hollow structure, so as to facilitate connection between the electromagnetic transmitting part and the wire.
4. The novel omnidirectional three-dimensional transmitting coil device for wireless power transmission according to claim 1, wherein the high-frequency power supply is disposed on the base.
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| CN108233550A (en) * | 2018-02-01 | 2018-06-29 | 上海电机学院 | A kind of multistage multi-panel magnetic resonance pacemaker wireless charging system |
| CN109038845B (en) * | 2018-08-02 | 2021-09-24 | 大连理工大学 | Non-directional spherical equipment induction coupling type wireless power receiving device based on spherical segmentation |
| CN112069753B (en) * | 2020-08-28 | 2023-11-10 | 中国能源建设集团湖南省电力设计院有限公司 | Magnetic field calculation method for regular polygon plane spiral coil |
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