CN113436867A - Magnetic shielding coil assembly for wireless charging of electric automobile - Google Patents
Magnetic shielding coil assembly for wireless charging of electric automobile Download PDFInfo
- Publication number
- CN113436867A CN113436867A CN202110795466.5A CN202110795466A CN113436867A CN 113436867 A CN113436867 A CN 113436867A CN 202110795466 A CN202110795466 A CN 202110795466A CN 113436867 A CN113436867 A CN 113436867A
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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- 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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- 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
- H02J50/10—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
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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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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- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Regulation Of General Use Transformers (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to a magnetic shielding coil assembly for wireless charging of an electric automobile, which comprises a transmitting coil and a receiving coil, wherein the transmitting coil is of an axial spiral structure, the receiving coil is of a radial spiral structure, the back surfaces of the transmitting coil and the receiving coil are both connected with a back plate double-layer shielding structure, the back plate double-layer shielding structure comprises a ferrite plate and a steel plate, one surface of the ferrite plate is connected with the steel plate, and the other surface of the ferrite plate is connected with the transmitting coil or the receiving coil. Compared with the prior art, the transmitting coil axial spiral structure can enable magnetic energy to be concentrated in the spiral coil hole, the receiving coil radial spiral can receive the magnetic energy in a larger area, the ferrite plate and steel plate double-layer shielding structure has the characteristics of high magnetic conductivity, high saturation magnetic flux and extremely small internal magnetic resistance, the magnetic leakage of the surrounding space is reduced, and the electromagnetic environment of the surrounding space is optimized.
Description
Technical Field
The invention relates to the technical field of wireless charging electromagnetic shielding, in particular to a magnetic shielding coil assembly for wireless charging of an electric automobile.
Background
In 2011, a team in teaching boys.j.t. of the university of oscilant, new zealand ensures high efficiency, low cost and low weight of wireless charging of electric vehicles by optimizing the usage amount of strip-shaped ferrite.
In 3 months 2014, the swiss los federal institute of technology (EPFL) electromagnetic and acoustic laboratories studied a short-range, small-size wireless transmission system operating at 100kHz with 5W four coils (two transmit and two receive) and incorporated 76mm and 50mm ferrite disk shields. Simulations have found that the electric field values conform to the exposure guidelines even if a finger touches the top of the transmitting coil when the receiving device is picked up.
In 2014, the inverter, the power line module, the pickup module, the rectifier and the regulator are all optimally designed by a high-grade scientific and technical institute (KAIST) Chun t.r. team in korea, and experimental results show that the power transmission efficiency of 100kW can reach 80% under an air gap of 26 cm. Based on the system, passive shielding is provided, wherein a vertical ground metal plate is arranged underground, and a vertical grounding plate is connected with the bottom of a metal side wall of a vehicle by a metal brush for constructing a protective cover; a mechanism is also proposed for reactive shielding by magnetic field cancellation using a reactive resonant current loop method, the induced magnetic field for cancellation can be controlled by a capacitance value.
The Jiseong Kim et al of KAIST, korea, further proposed a shielding method (resonant reactive shielding technology) for adjusting the current in the passive shielding coil by capacitance, and performed simulation analysis on the designed magnetic shielding transmission system by Maxwell simulation software, and applied the technology to the commonly used electronic devices, and discussed the related problems of system efficiency and EMF (electric field, magnetic field and electromagnetic field), and further proposed a concept and design method of active inductive reactive shielding based on LC resonance coil, which can cancel the magnetic field generated by the system by using the magnetic field generated by the LC resonance coil, without consuming extra energy, and can reduce the incident magnetic field by 64% to the maximum extent. The problem of shielding coil current uncontrollable is solved.
In 2015, korean KAIST proposed a novel shielding structure, which adopts a ferrite and aluminum metal double-layer shielding structure, wherein the thickness of an aluminum plate is 1mm, and the gap between the aluminum plate and the shielding material of the ferrite is 5mm, and the novel shielding structure is placed in a wireless power transmission system, so that the magnetic field intensity can be effectively reduced, but the structural area is large, and the volumes of a transmitting coil and a receiving coil are large.
In 2017, a group of a.dolara subjects of the energy department of milan university of science and technology studied changes of the height, radius and thickness of an aluminum plate, changes of system self-inductance and mutual inductance and influences on a space electromagnetic field, and a shielding structure of a T-shaped magnetic core, an aluminum plate and an aluminum ring is designed for a circular coupling structure.
The above technique has the following disadvantages:
the reduction of The surrounding magnetic field is limited, and The surrounding magnetic field reaches The standard set by The International Commission on Non-Ionizing Radiation Protection, but is also in a high position, so that The surrounding magnetic field still has certain harm to people under The magnetic field strength of The level for a long time; if the ambient electromagnetic field strength is reduced, the efficiency of wireless power transmission is also reduced; in addition, the device has high cost and high manufacturing cost.
Disclosure of Invention
The invention aims to overcome the defect of limited reduction of the ambient magnetic field in the prior art and provide a magnetic shielding coil assembly for wireless charging of an electric automobile.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a magnetic screen coil subassembly for electric automobile is wireless charges, includes transmitting coil and receiving coil, transmitting coil is axial helical structure, receiving coil is radial helical structure, transmitting coil and receiving coil's the back all is connected with the double-deck shielding structure of backplate, the double-deck shielding structure of backplate includes ferrite plate and steel sheet, the one side connecting steel plate of ferrite plate, the another side is connected transmitting coil or receiving coil.
Further, a gap is left between the ferrite plate and the steel plate.
Furthermore, the transmitting coil and the receiving coil are wound by litz coils.
Furthermore, the magnetic shielding coil assembly further comprises an active induction coil, the active induction coil is connected with an adjustable capacitor in series, and at least one active induction coil is surrounded on the outer sides of the transmitting coil and the receiving coil.
Further, a gap is reserved between the active induction coil and the transmitting coil or the receiving coil.
Furthermore, the active induction coil comprises two semicircular sub-coils, each semicircular sub-coil is connected with an adjustable capacitor in series, each semicircular sub-coil comprises a first semicircular part and a second semicircular part, the circle centers of the first semicircular part and the second semicircular part are the same, the radius of the first semicircular part is larger than that of the second semicircular part, and one end of the first semicircular part, which is the same side with the second semicircular part, is connected through a straight lead.
Furthermore, an annular shielding plate is further installed on the outer side of the whole body of the transmitting coil and the active induction coil.
Furthermore, the annular shielding plate is made of steel.
Further, the height of the annular shield plate is the same as the height of the transmitting coil.
Further, the thickness of the annular shielding plate is within a range of 4-6 mm.
Compared with the prior art, the invention has the following advantages:
(1) the invention adopts the axial spiral structure of the transmitting coil to enable the magnetic energy to be concentrated in the spiral coil hole, the radial spiral of the receiving coil can receive the magnetic energy in a larger area, the ferrite plate and steel plate double-layer shielding structure has the characteristics of high magnetic conductivity, high saturation magnetic flux and extremely small internal magnetic resistance, the magnetic flux passes through a path with low magnetic resistance, most of the magnetic force lines flow into the magnetic material through magnetic flux shunting, the magnetic leakage of the surrounding space is reduced, and the electromagnetic environment of the surrounding space is optimized.
(2) The active induction coil is arranged outside the transmitting coil and the receiving coil, the active induction coil adopts a passive mode, the active induction coil is influenced by a magnetic field generated by the main coil based on the ampere loop theorem, induced current with the phase difference of 180 degrees with the current in the circuit of the main coil can be generated in the circuit, the circuit of the active induction coil resonates by adjusting the capacitor, the magnetic field generated by the active induction coil offsets the magnetic field generated by the main coil of the system, extra energy is not consumed, and magnetic leakage is reduced.
(3) The annular shielding plate made of steel is arranged on the outer side of the whole body of the transmitting coil and the active induction coil, so that magnetic energy can be further shielded, magnetic leakage is reduced, and the electromagnetic environment is improved.
Drawings
Fig. 1 is a schematic structural view of a transmitting coil portion in a magnetically shielded coil assembly provided in an embodiment of the present invention;
fig. 2 is a schematic structural view of a receiving coil portion in a magnetic shield coil assembly provided in an embodiment of the present invention;
in the figure, 1, a transmitting coil, 2, a receiving coil, 3, a ferrite plate, 4, a steel plate, 5, an active induction coil, 51, a semicircular ring coil, 511, a first semicircular part, 512, a second semicircular part, 513, a straight wire, 6 and a ring-shaped shielding plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Example 1
As shown in fig. 1 and fig. 2, this embodiment provides a magnetic shielding coil assembly for wireless charging of electric automobile, including transmitting coil 1 and receiving coil 2, transmitting coil 1 is axial helical structure, receiving coil 2 is radial helical structure, transmitting coil 1 and receiving coil 2's the back all are connected with the double-deck shielding structure of backplate, the double-deck shielding structure of backplate includes ferrite plate 3 and steel sheet 4, ferrite plate 3's one side connecting plate 4, transmitting coil 1 or receiving coil 2 is connected to the another side, leave the clearance between ferrite plate 3 and steel sheet 4.
The transmitting coil 1 is axially helical, so that magnetic energy can be concentrated in the helical coil hole, the receiving coil 2 can receive magnetic energy in a larger area in a radial helical manner, the ferrite plate 3 and the steel plate 4 have the characteristics of high magnetic conductivity, high saturation magnetic flux and extremely small internal magnetic resistance, the magnetic flux can pass through a path with low magnetic resistance, most of magnetic lines of force flow into a magnetic material through magnetic flux shunting, the magnetic leakage of the surrounding space is reduced, and the electromagnetic environment of the surrounding space is optimized.
In a preferred embodiment, the transmitting coil 1 and the receiving coil 2 are wound by litz coils.
Litz wire is formed by twisting a plurality of enameled wires into a folded wire, the diameter of each enameled wire is very small, and the skin effect and the proximity effect of each enameled wire are basically negligible. And a plurality of enameled wires are twisted together, the total resistance of the enameled wires is equivalent to the resistance of a single coil with the same diameter, and the alternating current resistance is greatly reduced, so that the influence of the skin effect and the proximity effect is reduced.
In a preferred embodiment, the magnetic shielding coil assembly further comprises an active induction coil 5, the active induction coil 5 is connected in series with an adjustable capacitor, the outsides of the transmitting coil 1 and the receiving coil 2 are respectively surrounded by at least one active induction coil 5, and a gap is reserved between the active induction coil 5 and the transmitting coil 1 or the receiving coil 2.
Specifically, the active induction coil 5 includes two semicircular sub-coils 51, each semicircular sub-coil 51 is connected in series with an adjustable capacitor, each semicircular sub-coil 51 includes a first semicircular portion 511 and a second semicircular portion 512 having the same center, the radius of the first semicircular portion 511 is greater than that of the second semicircular portion 512, and one end of the first semicircular portion 511 and one end of the second semicircular portion 512 which are on the same side are connected through a straight wire 513.
The active induction coil 5 adopts a passive mode, based on the ampere loop theorem, the active induction coil 5 is influenced by a magnetic field generated by the main coil, an induced current with a phase difference of 180 degrees with the current in the circuit of the main coil can be generated in the circuit, the circuit of the active induction coil 5 resonates by adjusting the capacitance, the magnetic field generated by the active induction coil 5 counteracts the magnetic field generated by the main coil of the system, extra energy is not consumed, and magnetic leakage is reduced.
In a preferred embodiment, an annular shielding plate 6 is further mounted on the outer side of the whole of the transmitting coil 1 and the active induction coil 5, the annular shielding plate 6 is made of steel, the height of the annular shielding plate 6 is the same as that of the transmitting coil 1, and the thickness of the annular shielding plate 6 is within a range of 4-6 mm, preferably 5 mm.
The steel annular shielding plate 6 around the transmitting coil can further shield magnetic energy, reduce magnetic leakage and improve electromagnetic environment.
By arbitrarily combining the above preferred embodiments, a more preferred embodiment can be obtained.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a magnetic screen coil subassembly for electric automobile is wireless to be charged, includes transmitting coil (1) and receiving coil (2), its characterized in that, transmitting coil (1) is axial helical structure, receiving coil (2) are radial helical structure, the back of transmitting coil (1) and receiving coil (2) all is connected with the double-deck shielding structure of backplate, the double-deck shielding structure of backplate includes ferrite plate (3) and steel sheet (4), steel sheet (4) are connected to the one side of ferrite plate (3), and the another side is connected transmitting coil (1) or receiving coil (2).
2. Magnetic shield coil assembly for electric vehicle wireless charging according to claim 1, characterized in that a gap is left between the ferrite plate (3) and the steel plate (4).
3. The magnetic shielding coil assembly for the wireless charging of the electric automobile is characterized in that the transmitting coil (1) and the receiving coil (2) are wound by litz coils.
4. Magnetic shielding coil assembly for wireless charging of electric vehicles according to claim 1, characterized in that the magnetic shielding coil assembly further comprises an active induction coil (5), the active induction coil (5) is connected in series with an adjustable capacitance, and the outer sides of the transmitting coil (1) and the receiving coil (2) each enclose at least one of the active induction coils (5).
5. The magnetic shielding coil assembly for the wireless charging of the electric automobile according to claim 4, characterized in that a gap is left between the active induction coil (5) and the transmitting coil (1) or the receiving coil (2).
6. The magnetic shielding coil assembly for the wireless charging of the electric automobile according to claim 4, wherein the active induction coil (5) comprises two semicircular ring coils (51), each semicircular ring coil (51) is connected with an adjustable capacitor in series, each semicircular ring coil (51) comprises a first semicircular part (511) and a second semicircular part (512) which have the same circle center, the radius of the first semicircular part (511) is larger than that of the second semicircular part (512), and one ends of the first semicircular part (511) and the second semicircular part (512) on the same side are connected through a straight wire (513).
7. The magnetic shielding coil assembly for the wireless charging of the electric automobile is characterized in that an annular shielding plate (6) is further installed on the outer side of the whole body of the transmitting coil (1) and the active induction coil (5).
8. The magnetic shielding coil assembly for the wireless charging of the electric automobile according to claim 7, characterized in that the material of the annular shielding plate (6) is steel.
9. Magnetic shield coil assembly for wireless charging of electric vehicles, according to claim 7, characterized in that the height of the annular shield plate (6) is the same as the height of the transmitter coil (1).
10. Magnetic shield coil assembly for wireless charging of electric vehicles according to claim 7, characterized in that the thickness of the annular shield plate (6) is within the range of 4-6 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110795466.5A CN113436867B (en) | 2021-07-14 | 2021-07-14 | Magnetic shielding coil assembly for wireless charging of electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110795466.5A CN113436867B (en) | 2021-07-14 | 2021-07-14 | Magnetic shielding coil assembly for wireless charging of electric automobile |
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| CN113436867B CN113436867B (en) | 2023-08-29 |
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| CN113436867B (en) | 2023-08-29 |
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