CN113113976A - Application of composite shielding layer - Google Patents
Application of composite shielding layer Download PDFInfo
- Publication number
- CN113113976A CN113113976A CN202110564552.5A CN202110564552A CN113113976A CN 113113976 A CN113113976 A CN 113113976A CN 202110564552 A CN202110564552 A CN 202110564552A CN 113113976 A CN113113976 A CN 113113976A
- Authority
- CN
- China
- Prior art keywords
- shielding layer
- coil
- transmitting
- receiving
- composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention belongs to the technical field of electromagnetism, and relates to application of a composite shielding layer, wherein the composite shielding layer formed by hexagonal ferrite magnetic sheets, nanocrystalline strips and aluminum foils is used for a wireless power transmission DD type magnetic coupler; the thickness of the integral shielding layer is smaller than that of a single-layer or double-layer shielding layer used for the DD type magnetic coupler at present, the weight and the cost are low, and the integral shielding layer can be widely used in a wireless power transmission system.
Description
The technical field is as follows:
the invention belongs to the technical field of electromagnetism, and relates to application of a composite shielding layer.
Background art:
the electromagnetic coupler (also called magnetic coupler) is a connection link of the transmitting end and the receiving end of an electromagnetic induction type and electromagnetic resonance type wireless power transmission (charging) system, and the design of the structure and the parameters of the electromagnetic coupler directly influences the system performanceCan be used. The existing electromagnetic coupler consists of two parts, namely an energy transmitting mechanism and an energy receiving mechanism, wherein the energy transmitting mechanism is composed of a transmitting coil L as shown in a dotted frame in figure 1pAnd a shielding layer SpFormed by a receiving coil LsAnd a shielding layer SsAnd (4) forming. The transmission compensation network and the reception compensation network in fig. 1 are composed of inductors and capacitors, and the basic compensation network is a transmission side series capacitance compensation type (SS), a reception side series capacitance compensation type (SP), a transmission side parallel capacitance compensation type (PS), a reception side series capacitance compensation type (PP); further, there are various high-order compensation networks including LCC-S type, LCL-LCL type, LCC-LCC type, P-CLCL type, etc. The transmitting coil and the receiving coil of the DD-type magnetic coupler are both DD-type coils, the DD-type coils are divided into DD coils with single D coils in a square shape, DD coils with single D coils in a semicircular shape and DD coils with single D coils in a square round corner shape. In the prior art, the shielding layers adopted by the DD type magnetic coupler are generally a single-layer ferrite shield and a double-layer ferrite-aluminum shield, and the ferrite is mostly in the form of a strip, such as the single-layer ferrite shield shown in fig. 2 and the double-layer ferrite-aluminum shield shown in fig. 3. The existing shielding layers for the DD type magnetic coupler have the defects of large volume, heavy weight and high cost. CN201910515945X discloses a composite shielding layer for wireless power transmission magnetic coupler, which is made of fan-shaped ferrite magnetic sheet, nanocrystalline strip and aluminum foil, and is suitable for small-sized electric equipment with wireless power transmission coupler, and not suitable for high-power electric equipment or machines. Therefore, the novel composite shielding layer designed for the DD type magnetic coupler for wireless power transmission has great practical value and practical significance.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and provides an application of a composite shielding layer for a wireless power transmission DD type magnetic coupler.
In order to achieve the purpose, the composite shielding layer is used for a wireless power transmission DD type magnetic coupler and comprises a transmitting mechanism shielding layer and a receiving mechanism shielding layer, wherein the transmitting mechanism shielding layer and the receiving mechanism shielding layer are respectively composed of three shielding layers and sequentially comprise an aluminum foil, a nanocrystalline strip and a ferrite magnetic sheet from outside to inside, a transmitting coil is arranged on the inner side of the ferrite magnetic sheet of the transmitting mechanism shielding layer, a receiving coil is arranged on the inner side of the ferrite magnetic sheet of the receiving mechanism shielding layer, a receiving mechanism is fixed on a metal bottom plate, and a transmission distance is reserved between the receiving coil and the transmitting coil.
The ferrite magnetic sheet of the invention has a hexagonal shape, all the magnetic sheets are arranged in parallel and an air gap is left in the middle.
The transmitting coil and the receiving coil of the DD-type magnetic coupler for line electric energy transmission are both DD-type coils, and each DD-type coil comprises a DD coil with a single D coil in a square shape, a DD coil with a single D coil in a semicircular shape and a DD coil with a single D coil in a square round angle shape.
Compared with the prior art, the thickness of the integral shielding layer is smaller than that of a single-layer or double-layer shielding layer used for the DD type magnetic coupler at present, the weight and the cost are both lower, and the invention can be widely used in a wireless electric energy transmission system.
Description of the drawings:
fig. 1 is a schematic diagram illustrating a wireless charging system in the prior art.
Fig. 2 is a top view of a prior art single shield DD magnetic coupler launching mechanism.
Fig. 3 is a top view of a prior art dual shield DD magnetic coupler launch mechanism.
Fig. 4 is a division diagram of the coupling area of the single shield layer DD magnetic coupler.
Fig. 5 is a cross-sectional view of the composite shield DD magnetic coupler according to the present invention.
Fig. 6 is a top view of the launch mechanism of the magnetic coupler with composite shield DD according to the present invention.
Fig. 7 is a schematic diagram of a hexagonal ferrite sheet of the composite shield DD magnetic coupler according to the present invention.
The specific implementation mode is as follows:
the technical solution of the present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
the composite shielding layer can be used for a wireless power transmission DD type magnetic coupler, the composite shielding layer comprises a transmitting mechanism shielding layer and a receiving mechanism shielding layer, the transmitting mechanism shielding layer comprises three shielding layers, the innermost layer (close to a coil) is a ferrite magnetic sheet 3, the middle layer is a nanocrystalline strip 2, and the outermost layer is an aluminum foil 1; the receiving mechanism is characterized in that the innermost layer (close to the coil) of the shielding layer of the receiving mechanism is a ferrite magnetic sheet 6, the middle layer is a nanocrystalline strip 7, the outermost layer is an aluminum foil 8, the receiving mechanism is fixed on a metal plate 9, the transmitting coil 4 is arranged on the inner side of the ferrite magnetic sheet 3 of the shielding layer of the transmitting mechanism, the receiving coil 5 is arranged on the inner side of the ferrite magnetic sheet 6 of the shielding layer of the transmitting mechanism, the receiving mechanism is fixed on a metal bottom plate 9, and a transmission distance is formed between the transmitting coil 4 and the receiving coil 5.
In the present embodiment, both the transmitting coil and the receiving coil are DD-type coils, and fig. 2 to 6 show a DD-type coil in which a single D-coil is square, the composite shielding layer is also applicable to a DD-type coil in which a single D-coil is semicircular and square and round.
In this embodiment, the ferrite sheet 3 of the shielding layer of the receiving mechanism and the ferrite sheet 6 of the shielding layer of the transmitting mechanism are in a hexagonal structure arranged in parallel, the distribution positions are determined by dividing the self-coupling and mutual-coupling regions of the DD-type magnetic coupler, fig. 4 is a coupling region division diagram of the DD-type magnetic coupler, in order to increase the coupling coefficient of the DD-type magnetic coupler, the ferrite amount in the self-coupling region is reduced, and the ferrite is concentrated in the mutual-coupling region, so that the distribution positions of the ferrite sheets 3 and 6 do not include the edge of the coil in the x direction and the edge of the coil in the y direction, the magnetic flux density inside the ferrite core is large, and a large core loss is generated, and the magnetic flux density inside the DD-type strip ferrite is analyzed to find that the magnetic flux density inside the strip-shaped ferrite gradually decreases from the middle portion to both sides, and thus, the magnetic flux density inside the strip-shaped ferrite, thereby reducing the core loss, and the width of the ferrite sheets 3 and 6 is gradually reduced from the middle to both sides, and is hexagonal in shape.
Example 2:
in the embodiment, the composite shielding layer of embodiment 1 is applied to wireless charging of an electric forklift, the switching frequency is 85kHz, the output power is 360W, the transmitting coil 4 is arranged inside the ferrite magnetic sheet 3 of the shielding layer of the transmitting mechanism, the receiving coil 5 is arranged inside the ferrite magnetic sheet 6 of the shielding layer of the receiving mechanism, the receiving mechanism is fixed on the metal bottom plate 9, and the transmission distance is formed between the receiving coil 4 and the transmitting coil 5.
In the embodiment, the transmitting coil and the receiving coil are wound in a DD mode, the coil is the same in size, the length of the coil is 240mm, the width of the coil is 150mm, the thickness of the coil is 5mm, the number of the windings is 2, the width of the winding of the single D coil is 20mm, and the transmission distance between the transmitting coil 4 and the receiving coil 5 is 60 mm; the results of ferrite disks 3 and 6 are shown in FIG. 7, where the individual disks are hexagonal, all disks are arranged in parallel and with air gaps in between, the number of parallel-arranged ferrites is 5, the dimension a of each ferrite is 14mm, b is 210mm, and x is 3; the length of the nanocrystalline strip is 250mm, the width of the nanocrystalline strip is 160mm, the number of layers is 2, and the thickness of each layer is 18 um; the aluminum foil is 0.2mm thick, 260mm long and 170mm wide.
In the embodiment, a magnetic coupler structure with the same coupling coefficient as that of the embodiment is built by adopting a traditional double-layer shielding structure, and compared with the traditional double-layer shielding structure, the composite shielding structure reduces the ferrite dosage by 41.2% and reduces the aluminum dosage by 80% compared with the traditional double-layer shielding structure, and a nanocrystalline strip is thin and light, and the weight and the volume of the nanocrystalline strip can be almost ignored in the whole magnetic coupler; compared with the maximum magnetic flux density in the ferrite of the traditional double-layer shielding structure, the maximum magnetic flux density in the hexagonal ferrite is reduced by 17%, and the magnetic flux density distribution is more uniform; and the composite shielding structure of this embodiment has increased 10% to the shielding effect of magnetic leakage in the x direction than traditional double-deck shielding structure, has increased 20% to the shielding effect of magnetic leakage in the y direction.
Claims (4)
1. The application of the composite shielding layer is characterized in that the composite shielding layer is used for a wireless power transmission DD type magnetic coupler and comprises a transmitting mechanism shielding layer and a receiving mechanism shielding layer, the transmitting mechanism shielding layer and the receiving mechanism shielding layer are respectively composed of three shielding layers and sequentially comprise an aluminum foil, a nanocrystalline strip and a ferrite magnetic sheet from outside to inside, wherein a transmitting coil is arranged on the inner side of the ferrite magnetic sheet of the transmitting mechanism shielding layer, a receiving coil is arranged on the inner side of the ferrite magnetic sheet of the receiving mechanism shielding layer, a receiving mechanism is fixed on a metal bottom plate, and a transmission distance is reserved between the receiving coil and the transmitting coil.
2. The use of the composite shielding layer according to claim 1, wherein the ferrite magnetic sheet has a hexagonal shape in which all the magnetic sheets are uniformly arranged in parallel with an air gap in between.
3. Use of a composite shield according to claim 1, wherein the transmitting and receiving coils of the wire power transfer DD-type magnetic coupler are both DD-type coils.
4. Use of a composite shield according to claim 3, characterized in that the DD-type coil is a single D-coil shaped square DD-coil, a single D-coil shaped semicircular or a single D-coil shaped square-rounded DD-coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110564552.5A CN113113976A (en) | 2021-05-24 | 2021-05-24 | Application of composite shielding layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110564552.5A CN113113976A (en) | 2021-05-24 | 2021-05-24 | Application of composite shielding layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113113976A true CN113113976A (en) | 2021-07-13 |
Family
ID=76723040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110564552.5A Pending CN113113976A (en) | 2021-05-24 | 2021-05-24 | Application of composite shielding layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113113976A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112840A (en) * | 2019-06-14 | 2019-08-09 | 青岛大学 | A kind of wireless power transmission magnetic coupler constituted based on composite shielding layer |
| KR20190111381A (en) * | 2018-03-22 | 2019-10-02 | 엘지전자 주식회사 | Wireless charging pad and wireless charging apparatus |
| WO2019227213A1 (en) * | 2018-05-29 | 2019-12-05 | The Governing Council Of The University Of Toronto | Apparatus, methods, and systems for wireless power transfer |
-
2021
- 2021-05-24 CN CN202110564552.5A patent/CN113113976A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190111381A (en) * | 2018-03-22 | 2019-10-02 | 엘지전자 주식회사 | Wireless charging pad and wireless charging apparatus |
| WO2019227213A1 (en) * | 2018-05-29 | 2019-12-05 | The Governing Council Of The University Of Toronto | Apparatus, methods, and systems for wireless power transfer |
| CN110112840A (en) * | 2019-06-14 | 2019-08-09 | 青岛大学 | A kind of wireless power transmission magnetic coupler constituted based on composite shielding layer |
Non-Patent Citations (1)
| Title |
|---|
| 国网江苏省电力有限公司: "《"三合一"电子公路技术及应用》", 东南大学出版社, pages: 83 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111756121B (en) | High-power wireless power supply coupling mechanism and parameter design method thereof | |
| CN110112840B (en) | Wireless power transmission magnetic coupler based on composite shielding layer | |
| Regensburger et al. | High-performance multi-MHz capacitive wireless power transfer system for EV charging utilizing interleaved-foil coupled inductors | |
| CN108461264B (en) | Wireless power transmission loose magnetic coupling transformer device with large offset fault tolerance range and circuit thereof | |
| CN111193329B (en) | Three-transmitting-coil coupling mechanism and magnetic coupling WPT system formed by three-transmitting-coil coupling mechanism | |
| CN204480870U (en) | A kind of transmitting coil structure of high quality factor | |
| CN108599400B (en) | Laminated coupling mechanism, ECPT system formed by laminated coupling mechanism and system parameter design method | |
| CN110301019B (en) | Transformer and switching power supply | |
| CN113113976A (en) | Application of composite shielding layer | |
| CN111584220B (en) | High-power wireless charging magnetic coupling mechanism and electric energy transmission system thereof | |
| CN110138104B (en) | Composite shielding layer for wireless power transmission magnetic coupler | |
| CN210724332U (en) | Multi-load wireless charging device | |
| CN202585081U (en) | High-power magnetic integrated transformer for electric vehicle charging machine | |
| CN117254606A (en) | Composite shielding structure and wireless power transmission system | |
| CN108988503B (en) | Combined relay coil for bipolar wireless charging system and design method thereof | |
| US20230005653A1 (en) | High frequency integrated planar magnetics for a bidirectional ac to dc cllc resonant converter | |
| CN214675749U (en) | Narrow-side line electromagnetic induction heating device | |
| CN108666067A (en) | A kind of high efficiency integrated form LLC resonance transformers | |
| Hsieh et al. | An inductive wireless charger for electric vehicle by using LLC resonance with matrix ferrite core group | |
| CN111477452A (en) | Production process of folding iron core for dry-type transformer | |
| CN113937906B (en) | Integrated inductive coupling mechanism based on LCC energy transmission topology | |
| CN220155352U (en) | High-voltage small-volume high-frequency transformer | |
| CN113421756A (en) | High-frequency high-power multi-magnetic-core combined planar transformer | |
| Zhu et al. | Analysis on New Electromagnetic Shielding Structure and Shielding Effectiveness of Electric Vehicle Wireless Charging System | |
| CN116683655B (en) | Asymmetric insulating layer capacitive coupler and wireless power transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |