CN110011427B - Composite magnetic coupling resonant wireless power transmission coil - Google Patents
Composite magnetic coupling resonant wireless power transmission coil Download PDFInfo
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- CN110011427B CN110011427B CN201910288471.XA CN201910288471A CN110011427B CN 110011427 B CN110011427 B CN 110011427B CN 201910288471 A CN201910288471 A CN 201910288471A CN 110011427 B CN110011427 B CN 110011427B
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0009—Details relating to the conductive cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0216—Two layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- H02J5/005—
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
- H01F2027/2833—Wires using coaxial cable as wire
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Coils Or Transformers For Communication (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
A transmission line adopted by a composite magnetic coupling resonance type wireless power transmission coil is of a layered structure in cross section: the high-conductivity conductive material is formed by compounding a solid copper conductor, a first insulating layer, a copper conductive layer, a high-conductivity material conductive layer and a second insulating layer; the solid copper conductor forms an excitation coil or a load coil of the composite magnetic coupling resonance type wireless power transmission coil, and the copper conducting layer and the high-conductivity material conducting layer jointly form a transmitting coil or a receiving coil of the composite magnetic coupling resonance type wireless power transmission coil, so that the excitation coil and the transmitting coil or the load coil and the receiving coil are combined into a whole. The invention can reduce the internal resistance of the transmitting coil and the receiving coil caused by skin effect under high frequency condition in the four-coil magnetic coupling resonance type wireless electric energy transmission system, improve the coil quality factor, realize high-efficiency electric energy transmission and provide convenience for miniature and miniaturized devices by using the four-coil magnetic coupling resonance type wireless electric energy transmission technology.
Description
Technical Field
The invention belongs to the field of wireless power transmission, and particularly relates to a composite magnetic coupling resonance wireless power transmission coil.
Background
With the development of economy and society, electric energy plays an increasing role in people's life. The traditional electric energy transmission usually uses a huge power transmission network, and because the power transmission line is basically and directly exposed in the open air environment, a series of problems such as accident frequency and difficult maintenance are brought on one hand, and meanwhile, the problems of high construction cost, high investment of manpower and material resources and the like are also caused. With the advancement of technology, the demands of special equipment of working environments such as implanted devices, underwater devices and the like for wireless power transmission are becoming more urgent, and based on huge commercial prospects, people are constantly devoted to research on wireless power transmission. At present, the most widely used medium-distance, high-power and high-efficiency wireless power transmission technology with the highest application value is a magnetic coupling resonance type wireless power transmission (MCR-WPT) technology.
The magnetic coupling resonant wireless power transmission (MCR-WPT) system mainly comprises an energy transmitting end and an energy receiving end, and the core components comprise a transmitting coil, a receiving coil and a resonant capacitor. In order to achieve efficient wireless transmission of energy, the receiving end and the transmitting end are generally the same in parameters. When the system transmits electric energy, the LC loop formed by the transmitting coil and the resonant capacitor is resonated by the high-frequency alternating current with specific frequency, and the LC loop at the receiving end is resonated under the medium-distance condition, so that the electric energy source is continuously and efficiently transmitted to the receiving end. Since the resonant capacitor generally has a high quality factor, the high frequency loss is negligible, and thus the main factor affecting the overall transmission efficiency of the system in the LC tank is the performance of the transmitting coil and the receiving coil.
Currently, commonly used magnetic coupling resonant wireless power transmission coils are basically wound by copper enameled wires. When the system works, electromagnetic coupling is carried out between the transmitting coil and the receiving coil through high-frequency alternating current. Because the copper wire has skin effect under the high frequency condition, the effective conductive area of the coil conductor is greatly reduced, and the high frequency resistance is sharply increased along with the increase of frequency. The internal resistance of the coil is increased, the quality factor of the coil is reduced, and the overall transmission efficiency of the system is reduced; meanwhile, the current density of the part of the coil outside the skin depth of the copper conductor is extremely low under the high-frequency condition, the electric conduction effect is very little, and the resource waste is caused to a certain extent.
Meanwhile, magnetic coupling resonant wireless power transmission (MCR-WPT) systems generally adopt four-coil structures, namely an exciting coil and a transmitting coil at a transmitting end and a receiving coil and a load coil at a receiving end. The exciting coil is connected with a high-frequency power supply, and the transmitting coil is connected with the resonant capacitor to form an LC resonant loop; the receiving coil is connected with the resonance capacitor to form an LC resonance loop, and the load coil is connected with the rectifying circuit and the load circuit. A loose coupling transformer is formed between the exciting coil and the transmitting coil, and energy is transferred through an electromagnetic induction principle; a loose coupling transformer is also formed between the receiving coil and the load coil, and energy transmission is carried out through an electromagnetic induction principle. The energy wireless transmission is carried out between the transmitting coil and the receiving coil by the magnetic coupling resonance principle, and the influence of parasitic parameters of a high-frequency power supply, a rectifying circuit and a load circuit on tuning of LC resonance circuits of the transmitting end and the receiving end is effectively solved by utilizing an electromagnetic isolation means in the mode. However, based on the application scenes of miniaturized devices such as mobile terminals and implantable devices, compared with a magnetic coupling induction type wireless power transmission (MCI-WPT) system with a double-coil structure, the four-coil structure has the advantages that two coils are additionally added, so that the occupied space of the device is too large, and the application range of the magnetic coupling resonance type wireless power transmission technology is severely limited.
Disclosure of Invention
The invention provides a composite magnetic coupling resonant wireless power transmission coil, which can reduce internal resistance caused by skin effect under high frequency conditions of a transmitting coil and a receiving coil in a wireless power transmission system, improve the quality factor of the coil and realize high-efficiency transmission of electric energy.
In order to solve the technical problems, the invention adopts the following technical scheme:
A composite magnetic coupling resonance type wireless power transmission coil is characterized in that a transmission line adopted by the transmission coil is wound to form a layered structure in cross section: the high-conductivity conductive material is formed by compounding a solid copper conductor, a first insulating layer, a copper conductive layer, a high-conductivity material conductive layer and a second insulating layer from inside to outside in sequence; the solid copper conductor forms an excitation coil or a load coil of the composite magnetic coupling resonance type wireless power transmission coil, and the copper conducting layer and the high-conductivity material conducting layer jointly form a transmitting coil or a receiving coil of the composite magnetic coupling resonance type wireless power transmission coil, so that the excitation coil and the transmitting coil or the load coil and the receiving coil are combined into a whole.
The invention can effectively solve the following problems: (1) The existing magnetic coupling resonance type wireless power transmission coil has the problems that the effective conductive area of a conductor is greatly reduced, the internal resistance is increased, the coil quality factor is reduced, the overall transmission efficiency of the system is greatly influenced by frequency and the like under the high-frequency condition due to skin effect; (2) On the premise of ensuring that the overall performance of the coil is not affected, how to save copper resources required by manufacturing the coil to the maximum extent; (3) Because the four-coil structure is provided with the exciting coil and the load coil outside the transmitting coil and the receiving coil, the occupied space of equipment is larger, the application range of the magnetic coupling resonance type wireless power transmission technology is severely restricted, and the equipment integration is not facilitated; (4) In the traditional four-coil magnetic coupling resonance type wireless power transmission system, a certain air gap exists between the transmitting coil and the exciting coil or between the receiving coil and the load coil due to the adoption of a separate winding mode, so that magnetic leakage is increased, mutual inductance and coupling coefficient are reduced, and the outstanding problems of loss and the like in the energy transmission process are solved.
The method comprises the following steps:
1. In the layered structure transmission line adopted for winding the composite coil, the thin copper conducting layer and the high-conductivity material conducting layer conduct electricity under the high-frequency condition by means of high-conductivity material graphene or silver and copper together, so that the high-efficiency transmitting coil or receiving coil is constructed. The graphene is 40% higher than copper in conductivity at room temperature, meanwhile, the current density which is allowed to be carried by the graphene when the graphene is used as a conductor is 6 orders of magnitude higher than that of copper, the graphene has better conductivity than all known existing metals at room temperature, meanwhile, the conductivity of silver is far better than that of copper, the composite magnetic coupling resonance type wireless electric energy transmission coil can reduce the skin effect under the high-frequency condition by virtue of the excellent conductivity of the graphene and the silver to obtain smaller internal resistance, so that a higher quality factor is obtained, the self loss can be greatly reduced under the same transmission condition, and the transmission efficiency of the magnetic coupling resonance type wireless electric energy transmission system is improved.
The copper conducting layer is of a thin-wall hollow structure with specific thickness, and the thickness of the copper conducting layer is selected according to the skin depth under the actual required frequency band; the high-conductivity material conductive layer can further compensate and optimize the conductive effect of the copper conductive layer, and can ensure that the transmitting and receiving coils and the traditional solid structure coils have the same transmission performance, thereby greatly saving copper resources required for manufacturing the coils. By taking 100KHz working frequency as an example, the invention can save copper resources by about 64%, and the higher the working frequency is, the smaller the skin depth is, so that the better the saving effect is.
As described above, based on the skin effect of the conductor under high frequency conditions, the conventional transmitting coil or receiving coil is improved to a thin-walled hollow structure of a specific thickness, and then the exciting coil or the load coil is designed inside the hollow structure, so that the space is fully utilized, and the transmitting coil and the exciting coil or the receiving coil and the load coil are combined into a whole on the basis of not increasing the wire diameter. Under the same line diameter, the four-coil magnetic coupling resonance type wireless power transmission system formed by the composite magnetic coupling resonance type wireless power transmission coil saves nearly half of equipment space compared with the traditional four-coil structure. Under the same equipment space condition, the number of turns of the coil can be far more than that of the traditional coil, and higher inductance density can be obtained. Under the same transmission condition, the coupling effect between the transmitting coil and the receiving coil can be greatly enhanced, the transmission efficiency of the system is improved, convenience is provided for miniature and miniaturized devices to use the four-coil magnetic coupling resonance type wireless power transmission technology, and the application field of the magnetic coupling resonance type wireless power transmission technology is greatly expanded.
The composite magnetic coupling resonance type wireless power transmission coil is wound by adopting a transmission line with a multi-layer composite structure, so that a transmitting coil and an exciting coil or a receiving coil and a load coil are combined into a whole, and compared with a traditional magnetic coupling resonance type wireless power transmission system which is wound by four coils separately, the air gap between the transmitting coil and the exciting coil or between the receiving coil and the load coil can be reduced to the greatest extent, mutual inductance or coupling coefficient between the transmitting coil and the exciting coil or between the receiving coil and the load coil can be maximized, and energy loss in the transmission process is reduced to the lowest.
Drawings
FIG. 1 is a schematic diagram of a transmission line with a circular cross-section for use in the present invention;
FIG. 2 is a schematic diagram of a transmission line having a rectangular cross-section, as employed in the present invention;
Fig. 3 is a schematic structural view of a solenoid coil as the transmission coil of the present invention;
FIG. 4 is a schematic diagram of a transmission coil of the present invention in a planar spiral coil configuration;
Fig. 5 is a schematic structural view of a transmission coil of the present invention as an equally spaced planar rectangular coil;
fig. 6 is a schematic structural view of a transmission coil of the present invention as a variable pitch planar rectangular coil.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings so that the advantages and features of the present invention will be more readily understood by those skilled in the art, and thus the scope of the present invention will be more clearly defined.
A composite magnetic coupling resonance wireless power transmission coil, a transmission line cross section structure of which is wound is as follows: the solid copper conductor 1, the first insulating layer2, the copper conducting layer 3, the high-conductivity material conducting layer 4 and the second insulating layer 5 are sequentially arranged from inside to outside; the first insulating layer2 is coated on the outer surface of the solid copper conductor 1, the copper conducting layer 3 is positioned on the outer surface of the first insulating layer2, the high-conductivity conducting layer 4 is coated on the outer surface of the copper conducting layer 3, and the second insulating layer 5 is coated on the outer surface of the high-conductivity conducting layer 4. The composite magnetic coupling resonant wireless power transmission coil is wound by the transmission line to form a solenoid type, a plane spiral type or a plane rectangle.
The solid copper conductor 1 forms an exciting coil or a load coil of the composite magnetic coupling resonance type wireless power transmission coil, and the copper conducting layer 3 and the high-conductivity material conducting layer 4 jointly form a transmitting coil or a receiving coil of the composite magnetic coupling resonance type wireless power transmission coil, so that the exciting coil and the transmitting coil or the load coil and the receiving coil are combined into a whole.
The working process of the invention comprises the following steps:
When the inner layer excitation coil of the composite magnetic coupling resonance type wireless electric energy transmission coil at the system transmitting end is connected to the high-frequency inverter power supply at the system transmitting end, the outer layer transmission coil is connected with the resonance capacitor to form an LC resonance loop, meanwhile, the inner layer load coil of the composite magnetic coupling resonance type wireless electric energy transmission coil at the receiving end is connected to the rectifying circuit at the system receiving end, and the outer layer receiving coil is connected with the resonance capacitor to form the LC resonance loop. When the magnetic coupling resonance type wireless power transmission (MCR-WPT) system works, energy transfer is carried out between an inner layer exciting coil and an outer layer transmitting coil of a transmitting end through an electromagnetic induction principle, and energy transfer is carried out between the transmitting coil and a receiving coil through a magnetic coupling resonance principle. Meanwhile, the outer layer receiving coil of the composite coil at the receiving end transmits the received electric energy to the inner layer load coil through an electromagnetic induction principle.
When the magnetic coupling resonance type wireless electric energy transmission system works, high-frequency alternating current is passed through the coil, and the current is intensively distributed on the surface of the coil conductor due to the action of skin effect. The conductive layer of the transmitting coil or the receiving coil of the composite magnetic coupling resonance type wireless electric energy transmission coil is composed of the copper conductive layer and the conductive layer of the high-conductivity material, the copper conductive layer is a thin-wall tubular conductive layer, the conductive layer of the high-conductivity material is used for compensating and optimizing the conductive effect of the copper conductive layer, and the conventional magnetic coupling resonance type wireless electric energy transmission coil only depends on copper on the outer layer of a conductor to be used as a conductive medium under the high-frequency condition, so that the transmitting coil or the receiving coil of the composite magnetic coupling resonance type wireless electric energy transmission coil can achieve the purposes of smaller internal resistance, lower self loss and higher quality factor by means of excellent conductive performance of the conductive layer of the high-conductivity material.
In a four-coil magnetic coupling resonant wireless power transmission (MCR-WPT) system, due to the fact that the quality factors of an exciting coil and a load coil have low influence on the transmission efficiency of the system, after the composite structure is adopted, a coaxial high-quality-factor transmitting coil or receiving coil and an exciting coil or load coil with a slightly lower quality factor can be obtained under the condition of the same wire diameter. Because the transmitting coil and the exciting coil or the receiving coil and the load coil adopt coaxial structures, the air gap between the transmitting coil and the exciting coil or the receiving coil and the load coil is greatly reduced, the mutual inductance or the coupling coefficient between the transmitting coil and the exciting coil can be maximized, and the energy loss in the transmission process is minimized. Moreover, the structure ensures that the equipment space occupied by the composite magnetic coupling resonance type wireless power transmission coil is far lower than that of the traditional magnetic coupling resonance type wireless power transmission coil.
The invention is further illustrated by the following specific examples.
In embodiment 1, the composite magnetic coupling resonant wireless power transmission coil of the invention is a solenoid coil (as shown in fig. 3), and the cross section of the transmission line used for winding the coil is a multi-layer concentric circle, as shown in fig. 1: comprises a solid copper conductor 1, a first insulating layer 2, a copper conducting layer 3, a conducting layer 4 made of silver and made of high-conductivity material, and a second insulating layer 5. The resonance frequency of the magnetic coupling resonance type wireless power transmission (MCR-WPT) system designed in the embodiment is 1MHz, and the thin wall thickness of the corresponding copper conducting layer 3 is 0.065mm. The solid copper conductor 1 is a copper wire with a wire diameter of 1.8mm, the first insulating layer 2 is coated on the outer surface of the solid copper conductor 1, the copper conducting layer 3 is plated on the outer surface of the first insulating layer 2 by using NCVM non-conductive electroplating technology, and the high-conductivity material conducting layer 4 made of silver is plated on the surface of the copper conducting layer 3 with a thickness of 0.065mm by adopting electroplating technology. The second insulating layer 5 is coated on the outer surface of the conductive layer 4 of high conductivity material made of silver. The components of the first insulating layer 2 and the second insulating layer 5 are polyurethane. In this embodiment, the radius of the composite magnetic coupling resonant wireless power transmission coil is 5cm, the distance between every two adjacent turns is 0.1mm, the number of turns is 10, and the size of the transmission line used for winding the transmission coil can be selected according to actual needs.
In embodiment 2, the composite magnetic coupling resonant wireless power transmission coil of the invention is a planar spiral coil (as shown in fig. 4), and the cross section of a transmission line used for winding the coil is a multi-layer concentric circle, as shown in fig. 1: comprises a solid copper conductor 1, a first insulating layer 2, a copper conducting layer 3, a conducting layer 4 made of silver and made of high-conductivity material, and a second insulating layer 5. The resonance frequency of the magnetic coupling resonance type wireless power transmission (MCR-WPT) system designed in the embodiment is 1MHz, and the thin-wall thickness of the corresponding copper conducting layer is 0.065mm. The solid copper conductor 1 is a copper wire with a wire diameter of 1.8mm, the first insulating layer 2 is coated on the outer surface of the solid copper conductor 1, the copper conducting layer 3 is plated on the outer surface of the first insulating layer 2 by using NCVM non-conductive electroplating technology, and the high-conductivity material conducting layer 4 made of silver is plated on the surface of the copper conducting layer 3 with a thickness of 0.065mm by adopting electroplating technology. The second insulating layer 5 is coated on the outer surface of the conductive layer 4 of high conductivity material made of silver. The components of the first insulating layer 2 and the second insulating layer 5 are polyurethane. In this embodiment, the inner radius of the composite magnetic coupling resonant wireless power transmission coil is 5cm, the outer radius is 8cm, the distance between every two adjacent turns is fixed to be 1.33mm, the number of turns is 10, and the size of the transmission line adopted for winding the transmission coil can be selected according to actual needs.
Embodiment 3 the composite magnetic coupling resonant wireless power transmission coil of the invention is a planar rectangular coil (as shown in fig. 5), and the cross section of the transmission line used for winding the coil is a multilayer concentric rectangle, as shown in fig. 2: comprises a solid copper conductor 1, a first insulating layer 2, a copper conducting layer 3, a conducting layer 4 made of silver and made of high-conductivity material, and a second insulating layer 5. The resonance frequency of the magnetic coupling resonance type wireless power transmission (MCR-WPT) system designed in the embodiment is 1MHz, and the thin wall thickness of the corresponding copper conducting layer 3 is 0.065mm. The solid copper conductor 1 is a copper conductor with the length of 1.8mm and the width of 0.8mm, the first insulating layer 2 is coated on the outer surface of the solid copper conductor 1, the copper conducting layer 3 is plated on the outer surface of the first insulating layer 2 by using NCVM non-conductive electroplating technology, and the high-conductivity material conducting layer 4 made of silver is plated on the surface of the copper conducting layer 3 with the thickness of 0.065mm by adopting electroplating technology. The second insulating layer 5 is coated on the outer surface of the conductive layer 4 of high conductivity material made of silver. The components of the first insulating layer 2 and the second insulating layer 5 are polyurethane. In this embodiment, the inner radius of the composite magnetic coupling resonant wireless power transmission coil is 5cm, the outer radius is 8cm, the distance between every two adjacent turns is fixed to be 1.11mm, the number of turns is 10, and the size of the transmission line adopted for winding the transmission coil can be selected according to actual needs.
In embodiment 4, the composite magnetic coupling resonant wireless power transmission coil of the invention is a planar rectangular coil (as shown in fig. 6), and the cross section of the transmission line used for winding the coil is a multilayer concentric rectangle, as shown in fig. 2: comprises a solid copper conductor 1, a first insulating layer 2, a copper conducting layer 3, a conducting layer 4 made of graphene and made of high-conductivity material, and a second insulating layer 5. The resonance frequency of the magnetic coupling resonance type wireless power transmission (MCR-WPT) system designed in the embodiment is 1MHz, and the thin-wall thickness of the corresponding copper conducting layer is 0.065mm. The solid copper conductor is a copper conductor with the length of 1.8mm and the width of 0.8mm, the first insulating layer 2 is coated on the outer surface of the solid copper conductor 1, the copper conducting layer 3 is plated on the outer surface of the first insulating layer 2 by using NCVM non-conductive electroplating technology, and the high-conductivity material conducting layer 4 made of graphene grows graphene on the outer surface of the copper conducting layer 3 with the thickness of 0.065mm by adopting CVD technology. The high-conductivity material conductive layer 4 made of graphene is double-layer or multi-layer graphene. The second insulating layer 5 is coated on the outer surface of the conductive layer 4 of high-conductivity material made of graphene. The components of the first insulating layer 2 and the second insulating layer 5 are polyurethane. In this embodiment, the inner radius of the composite magnetic coupling resonant wireless power transmission coil is 5cm, the outer radius is 8cm, the distance between every two adjacent turns adopts a variable-spacing mode, the number of turns is 10 turns, and the size of the transmission line used for winding the transmission coil can be selected according to actual needs.
In the above-described embodiments, the first and second embodiments,
The cross section of the solid copper conductor 1 is round or rectangular, and the rectangular conductor can be applied to a flexible printed PCB coil, so that the coil is convenient for miniaturization design.
The first insulating layer 2 and the second insulating layer 5 are made of any one of polyaldehyde, polyurethane, polyester imine, polyamide and polyester imine, so that the solid copper conductor 1 and the copper conducting layer 3 are well insulated, and the coil performance is improved and stabilized.
The high-conductivity material conductive layer 4 is formed by any one of double-layer or multi-layer graphene or silver, and can be used for compensating and optimizing the copper conductive layer 3 to further improve conductivity. Or the copper conducting layer 3 and the high-conductivity material conducting layer 4 can be formed into a single material structure layer by any one of red copper, silver or graphene. The transmission performance is better when the material is completely made of high-conductivity materials.
The transmission line adopted in the winding process of the composite magnetic coupling resonance type wireless power transmission coil is respectively of the size: the diameter of the transmission line with the circular cross section is 1.9mm, and the length of the transmission line with the rectangular cross section is 2mm and the width is 1mm; the turn spacing of adjacent windings is: the solenoid coil is fixed to be 0.1mm, the planar spiral coil is fixed to be 1.33mm, the planar rectangular coil is fixed to be 1.11mm or sequentially increases from inside to outside, and the number of turns of all coils in the embodiment is 10 turns.
The copper conducting layer is made of red copper, the red copper is pure copper, the conductivity is superior to that of other copper alloy materials such as brass, and the problems of reduced performance of the transmitting and receiving coils and the like caused by using the materials such as brass can be avoided; the cross section shape of the copper conducting layer, the cross section shape of the first insulating layer, the cross section shape of the conducting layer of the high-conductivity material and the cross section shape of the second insulating layer are matched with the cross section shape of the solid copper conductor 1.
The thin wall (or coating) thickness of the copper conducting layer is equal to the skin depth of copper under the frequency required by actual use, so that the effective conducting area of a conductor under the high-frequency condition is ensured, and copper resources required by manufacturing a coil can be saved to the greatest extent; the basis for determining the thickness is as follows:
The skin depth is the distance from the current density of the outer surface of the conductor to the point that the current density is reduced to 1/e of the current density of the outer surface, wherein e is a natural base, the skin depth of copper is used as the thin wall thickness of the circular hollow copper conductor at the required system working frequency, and the expression is as follows:
where δ is skin depth, ω is angular frequency when the system is in operation, μ is permeability in vacuum, σ is conductivity of copper.
As described above, the present invention has been fully described in terms of the gist of the present invention, but the present invention is not limited to the above-described embodiments and implementation methods. A practitioner of the relevant art can make various changes and implementations within the scope of the technical idea of the invention.
Claims (9)
1. The composite magnetic coupling resonant wireless power transmission coil is characterized in that a transmission line adopted by winding the transmission coil has a layered structure in cross section: the high-conductivity copper conductor is formed by compounding a solid copper conductor (1), a first insulating layer (2), a copper conducting layer (3), a high-conductivity material conducting layer (4) and a second insulating layer (5) from inside to outside in sequence; the solid copper conductor (1) forms an excitation coil or a load coil of the composite magnetic coupling resonance type wireless power transmission coil, and the copper conducting layer (3) and the high-conductivity material conducting layer (4) jointly form a transmitting coil or a receiving coil of the composite magnetic coupling resonance type wireless power transmission coil, so that the excitation coil and the transmitting coil or the load coil and the receiving coil are combined into a whole.
2. A composite magnetic coupling resonant wireless power transfer coil according to claim 1, characterized in that the solid copper conductor (1) is circular or rectangular in cross section.
3. A composite magnetic coupling resonant wireless power transfer coil according to claim 1, characterized in that the first insulating layer (2) and the second insulating layer (5) are made of any one of polyaldehyde, polyurethane, polyester imine, polyamide, polyester imine.
4. A composite magnetic coupling resonant wireless power transmission coil according to claim 1, characterized in that the thickness of the copper conductive layer (3) is equal to the skin depth of copper at the frequency of use of the magnetic coupling resonant wireless power transmission system.
5. A composite magnetic coupling resonant wireless power transmission coil according to claim 4, wherein the copper conductive layer (3) is made of red copper.
6. A composite magnetic coupling resonant wireless power transfer coil according to claim 1, characterized in that the conductive layer (4) of high conductivity material is composed of double or multilayer graphene or silver.
7. The composite magnetic coupling resonant wireless power transmission coil according to claim 1, wherein the copper conductive layer (3) and the high-conductivity material conductive layer (4) are of two-layer structure, and all are composed of any one of red copper, silver or graphene, so that a single material structural layer is formed.
8. A composite magnetic coupling resonant wireless power transfer coil in accordance with claim 1, wherein the adjacent winding spacing of said transfer coil is fixed or gradually narrows or widens.
9. A composite magnetic coupling resonant wireless power transfer coil as claimed in claim 1, wherein the transfer coil is a solenoid coil, a planar spiral coil or a planar rectangular coil.
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| CN111370210B (en) * | 2020-04-27 | 2021-12-10 | 安捷利（番禺）电子实业有限公司 | Charging coil and wireless charging terminal |
| CN113131625A (en) * | 2021-05-08 | 2021-07-16 | 西华大学 | Novel water-cooling wireless electric energy transmission device adopting hollow copper pipe |
| CN114577856B (en) * | 2022-03-04 | 2023-09-22 | 山西大同大学 | Passive wireless sensor for monitoring coal-gangue mixing proportion based on second-order EP (EP) points |
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