CN113258686B - High-power magnetic leakage prevention mobile phone wireless charging system and magnetic positioning system - Google Patents
High-power magnetic leakage prevention mobile phone wireless charging system and magnetic positioning system Download PDFInfo
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- CN113258686B CN113258686B CN202110724537.2A CN202110724537A CN113258686B CN 113258686 B CN113258686 B CN 113258686B CN 202110724537 A CN202110724537 A CN 202110724537A CN 113258686 B CN113258686 B CN 113258686B
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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
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
Abstract
The invention discloses a high-power magnetic leakage prevention mobile phone wireless charging system in the technical field of wireless charging, which comprises a power receiving system arranged inside a mobile phone and an external power output system, wherein the power receiving system consists of a second magnetic core, a second solenoid, a first magnetic conductive sheet and a second magnetic conductive sheet, the second solenoid is wound on a core body of the second magnetic core, protruding ends at two ends of the second magnetic core are respectively fixed with the first magnetic conductive sheet and the second magnetic conductive sheet, and the other surfaces of the first magnetic conductive sheet and the second magnetic conductive sheet are connected with the inner wall of a receiving end shell; the power output system is composed of a first magnetic core and a first solenoid, the first solenoid is wound on a core body of the first magnetic core, and protruding ends of two ends of the first magnetic core are connected with the inner wall of the output end shell. The solenoid type power receiving system and the power output system of the invention, and the magnetic conductive sheet is added in the receiving system, so that the charging system has excellent charging effect under high power, and can reduce magnetic leakage and heat productivity.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a high-power magnetic leakage prevention mobile phone wireless charging system and a magnetic positioning system.
Background
With the rapid development of wireless charging technology, more and more consumer electronics products have carried wireless charging functions, and especially in the field of mobile phones, wireless charging has become a necessary option for top-level flagships. The basic principle of the wireless charging technology is that an electric power output end generates an electromagnetic signal, energy is transmitted to an electric power receiving end by utilizing an electromagnetic mutual inductance technology, and then the energy is stored in a battery.
The design of the wireless charging system which is most widely applied at present adopts a planar coil form, in the design scheme, an electric power receiving end which is arranged inside a mobile phone is in the planar coil form and is closely attached to the inner side of a mobile phone rear shell, in order to reduce the influence of an electromagnetic field on internal electronic elements of the mobile phone and improve the wireless charging efficiency, an electromagnetic shielding material is arranged between the receiving coil and the inside of the mobile phone, and is generally selected to be amorphous, nanocrystalline or ferrite. The external power output terminals are similarly designed and also in the form of coils plus shielding material.
The scheme has the advantages that the thickness of the power receiving end of the mobile phone is small, the whole thickness of the coil and the shielding material is 0.3-0.5mm, and the space utilization control is facilitated. However, the design has some defects, one of which is that the charging efficiency is relatively low, and because the magnetic force lines in the design scheme are in a non-closed state, the magnetic flux leakage problem is caused to a certain extent, energy loss is easy to cause, and the transmission efficiency is influenced; the second is the design of influencing heat dissipation, because conductor material can shield electromagnetic energy transmission, so there can not be conductor material between the coil of output and receiving terminal, and this requirement has restricted the application of heat dissipation materials such as metal and graphite to a great extent, and then influences the holistic thermal management design of cell-phone. The two design defects determine that the current scheme is not suitable for high-power wireless charging, the energy loss is more under high power, the generated heat is increased, and the temperature can be increased sharply due to limited heat dissipation energy, so that the use safety and the user experience are influenced.
Disclosure of Invention
According to the technical problems to be solved by the invention, the invention provides a high-power magnetic leakage prevention mobile phone wireless charging system and a magnetic positioning system.
In order to achieve the purpose, the high-power magnetic leakage prevention wireless charging system and the magnetic positioning system for the mobile phone comprise a power receiving system installed inside the mobile phone and an external power output system, wherein the power receiving system consists of a second magnetic core, a second solenoid, a first magnetic conductive sheet and a second magnetic conductive sheet, the second solenoid is wound on a core body of the second magnetic core, protruding ends of two ends of the second magnetic core are respectively fixed with the first magnetic conductive sheet and the second magnetic conductive sheet, and the other surfaces of the first magnetic conductive sheet and the second magnetic conductive sheet are connected with the inner wall of a receiving end shell; the power output system is composed of a first magnetic core and a first solenoid, the first solenoid is wound on a core body of the first magnetic core, and protruding ends of two ends of the first magnetic core are connected with the inner wall of the output end shell.
Furthermore, the height of the protruding ends at the two ends of the first magnetic core is equal and vertical to the core body between the two ends, and the height of the protruding ends at the two ends of the second magnetic core is equal and vertical to the core body between the two ends.
Furthermore, the first magnetic core and the second magnetic core are made of any one of ferrite, amorphous and nanocrystalline strips, and have magnetic permeability of more than 500 at a frequency of 30kHz-300kHz, and saturation induction of more than 200 mT.
Furthermore, the centers of the first magnetic conductive sheet and the second magnetic conductive sheet are provided with placing holes, the shapes of the placing holes are the same as those of the protruding ends at the two ends of the second magnetic core, and the thicknesses of the first magnetic conductive sheet and the second magnetic conductive sheet are smaller than 0.2 mm.
Furthermore, the first magnetic conductive sheet and the second magnetic conductive sheet are made of any one of ferrite, amorphous and nanocrystalline strips, and have magnetic permeability of more than 2000 at a frequency of 30kHz-300kHz, and saturation magnetic induction of more than 1000 mT.
Furthermore, the shape of the first magnetic conductive sheet and the second magnetic conductive sheet is any one of a circle, an equilateral rectangle and an equilateral triangle.
On the other hand, the invention also provides a magnetic positioning system, which comprises the high-power magnetic leakage prevention mobile phone wireless charging system, a plurality of first magnetic blocks and a plurality of second magnetic blocks, wherein the first magnetic blocks and the second magnetic blocks respectively surround the second magnetic cores and the first magnetic cores and are respectively fixed on the inner walls of the receiving end shell and the output end shell.
Furthermore, the S pole of the first magnetic block is fixed to the inner wall of the receiving end shell, and the N pole of the second magnetic block is fixed to the inside of the output end shell.
Has the advantages that: according to the high-power magnetic leakage prevention mobile phone wireless charging system and the magnetic positioning system, in the design, the magnetic force line is in a closed state in a working state, the magnetic leakage is small, the wireless charging efficiency is greatly improved, the receiving capacity of a receiving end to a magnetic field is enhanced due to the existence of the magnetic conductive sheet, meanwhile, the influence of the magnetic leakage on internal electronic elements of the mobile phone is reduced, and particularly in the high-power wireless charging state, the high efficiency is beneficial to controlling heating; in addition, the area of the transmission point is relatively small, the use limit of the heat dissipation material is less, the whole heat management design of the mobile phone product is facilitated, and the user experience of the mobile phone product is greatly improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of the operation of the power receiving system and the power output system according to the present invention.
Fig. 2 is a schematic diagram illustrating a power receiving system and a power outputting system according to the present invention.
FIG. 3 is a schematic view of the magnetic block inside the receiving end housing according to the present invention.
Fig. 4 is a schematic view of the magnetic block inside the output end housing according to the present invention.
In the figure: 1 is a first magnetic core; 2 is a first solenoid; 3 is a second magnetic core; 4 is a second solenoid; 5 is a receiving end shell; 6 is an output end shell; 7 is a first magnetic conductive sheet; 8 is a second magnetic conductive sheet; 9 is a first magnetic block; and 10 is a second magnetic block.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 scope of the present invention.
As shown in fig. 1-4, the power receiving system is composed of a second magnetic core 3, a second solenoid 4, a first magnetic conductive sheet 7 and a second magnetic conductive sheet 8, the second solenoid 4 is wound around the core body of the second magnetic core 3, the protruding ends of the two ends of the second magnetic core 3 are respectively fixed with the first magnetic conductive sheet 7 and the second magnetic conductive sheet 8, and the other sides of the first magnetic conductive sheet 7 and the second magnetic conductive sheet 8 are connected with the inner wall of the receiving end housing 5; the power output system is composed of a first magnetic core 1 and a first solenoid 2, the first solenoid 2 is wound on the core body of the first magnetic core 1, and the protruding ends of the two ends of the first magnetic core 1 are connected with the inner wall of the output end shell 6.
From the above description, it can be known that the conventional planar coil in the power receiving system and the power output system is changed into the solenoid type, and the magnetic conductive sheet is added to the magnetic core of the solenoid, so that the areas of the transmission point and the receiving point are relatively small, the use limit of the heat dissipation material is less, and the magnetic conductive sheet not only can enhance the receptivity to the magnetic field, but also can reduce the influence of magnetic leakage on the internal electronic components of the mobile phone.
In this embodiment, the protruding ends at the two ends of the first magnetic core 1 have the same height and are perpendicular to the core body between the two ends, and the protruding ends at the two ends of the second magnetic core 3 have the same height and are perpendicular to the core body between the two ends, as can be seen from the above description, the first magnetic core 1 and the second magnetic core 3 have the same shape, and both ends are provided with protruding ends, and transmission and reception are performed through the protruding ends. The raised end transmits and receives because the area of the transmission point is relatively small in this way, and the use of the heat dissipation material is less limited.
Specifically, the first magnetic core 1 and the second magnetic core 3 are made of any one of ferrite, amorphous and nanocrystalline strips, and have magnetic permeability of more than 500 at a frequency of 30kHz-300kHz, and saturation induction of more than 200 mT. As can be seen from the above description, the first magnetic core 1 and the second magnetic core 3 should be made of one of ferrite, amorphous and nanocrystalline strip materials because of their material properties, and should also satisfy the requirements of having a magnetic permeability greater than 500 and a saturation magnetic induction greater than 200mT at a frequency of 30kHz-300 kHz. After the conditions are met, the power transmission can be stably and safely carried out under the condition of high power.
In this embodiment, the centers of the first magnetic conductive plate 7 and the second magnetic conductive plate 8 are provided with placing holes, the shapes of the placing holes are the same as those of the protruding ends at the two ends of the second magnetic core 3, and the thicknesses of the first magnetic conductive plate 7 and the second magnetic conductive plate 8 are smaller than 0.2 mm. It can be known from the above description that the holes are placed at the centers of the first magnetic conductive plate 7 and the second magnetic conductive plate 8 and fixed at the protruding ends at the two ends of the second magnetic core 3, so that the receiving capability of the receiving end to the magnetic field is enhanced through the first magnetic conductive plate 7 and the second magnetic conductive plate 8, the influence of magnetic leakage on internal electronic components and better heat dissipation performance in a high-power state are reduced, and the control of the thickness is favorable for the utilization of the internal space. Specifically, the shape of the first magnetic conductive plate 7 and the second magnetic conductive plate 8 is any one of a circle, an equilateral rectangle, and an equilateral triangle. According to the description, the round shape, the equilateral rectangle and the equilateral triangle are easier to manufacture and form, and the processing difficulty is reduced.
The first magnetic conductive sheet 7 and the second magnetic conductive sheet 8 in this embodiment are made of any one of ferrite, amorphous, and nanocrystalline strip, and have a magnetic permeability greater than 2000 at a frequency of 30kHz to 300kHz, and a saturation magnetic induction greater than 1000 mT. As can be seen from the above description, the first magnetic conductive plate 7 and the second magnetic conductive plate 8 are disposed between the output end and the receiving end, because the larger magnetic conductivity can increase the acceptance and reduce the magnetic leakage.
On the other hand, the invention also provides a magnetic positioning system, which comprises the high-power magnetic leakage prevention mobile phone wireless charging system, a plurality of first magnetic blocks 9 and a plurality of second magnetic blocks 10, wherein the first magnetic blocks 9 and the second magnetic blocks 10 respectively surround the second magnetic cores 3 and the first magnetic cores 1 and are respectively fixed on the inner walls of the receiving end shell 5 and the output end shell 6. Specifically, first magnetic block 9 has a plurality of and encircles the equipartition around second magnetic core 3, and second magnetic block 10 has a plurality of and encircles the equipartition around first magnetic core 1, and first magnetic block 9 is the same with the quantity of second magnetic block 10. When the output end shell 6 is overlapped with the receiving end shell 5, the first magnetic block 9 and the second magnetic block 10 can be quickly overlapped, and the receiving end and the output end are ensured to be accurately butted.
Preferred embodiments:
as shown in fig. 1 and fig. 2, the second solenoid 4 in the power receiving system selects an enameled wire with a wire diameter of 0.5mm to wind on the surface of the second magnetic core 3 for 20 turns, the second magnetic core 3 selects a ferrite material, the ferrite has a magnetic permeability of 1000 at a frequency of 100kHz, a saturation magnetic induction of 450mT, the main body is strip-shaped, has a length of 100mm, a cross section of 5mm x 5mm and a square shape, two ends are tilted, and a height of 2mm, and forms two power receiving points of 5mm x 5mm, a magnetic conductive sheet is installed at the power receiving points, the magnetic conductive sheet in this example selects a circle, a radius of 10mm, an overall thickness of 0.1mm, the material is a nanocrystal, the magnetic permeability is greater than 2000 at 100kHz, and the saturation magnetic induction is 1000 mT. The inductance value of the power receiving end is 15-18uH under 100 kHz; the first solenoid 2 in the power output system is wound by enameled wires with the wire diameter of 1mm, the number of the enameled wires is 40, the first magnetic core 1 and the second magnetic core 3 at the receiving end are the same in material and shape, and the two cross sections face downwards to form two output points.
In the two structures, as shown in fig. 1, a receiving point of the power receiving system is fixed on the inner wall of the receiving end housing 5, an output point of the power output system is fixed on the inner wall of the output end housing 6, the receiving end housing 5 is placed on the output end housing 6 during use, and the receiving point and the output point are charged correspondingly.
On the basis of the above embodiment, in the design scheme, a magnetic positioning system is added in the receiving end shell 5 and the output end shell 6, as shown in fig. 3 and 4, 8 magnets are fixed on the inner wall of the receiving end shell 5, symmetrically distributed on two sides of the second magnetic core 3, and the S pole is outward; 8 magnets are fixed on the inner wall of the output end shell 6 and symmetrically distributed on two sides of the first magnetic core 1, and the N pole is outward; the positions of the magnets of the receiving end shell 5 and the output end shell 6 correspond to each other, and after the magnetic positioning system works, the two output points and the two receiving points can be quickly and accurately butted.
In the working state, alternating current with the frequency of 100kHz is applied to the first solenoid 2 at the power output end, an alternating electromagnetic field is formed inside the first magnetic core 1, the electromagnetic field is transmitted to a receiving point through the output point, an alternating electromagnetic field with the same frequency is induced inside the second magnetic core 3 at the power receiving end, and alternating voltage is formed inside the second solenoid 4, so that power transmission is completed.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (8)
1. High power prevents that magnetism leaks wireless charging system of cell-phone, including installing the inside electric power receiving system and the outside electric power output system of cell-phone, its characterized in that: the power receiving system is composed of a second magnetic core (3), a second solenoid (4), a first magnetic conductive sheet (7) and a second magnetic conductive sheet (8), the second solenoid (4) is wound on the core body of the second magnetic core (3), the protruding ends of the two ends of the second magnetic core (3) are respectively fixed with the first magnetic conductive sheet (7) and the second magnetic conductive sheet (8), and the other surfaces of the first magnetic conductive sheet (7) and the second magnetic conductive sheet (8) are connected with the inner wall of the receiving end shell (5); the power output system is composed of a first magnetic core (1) and a first solenoid (2), the first solenoid (2) is wound on a core body of the first magnetic core (1), and protruding ends of two ends of the first magnetic core (1) are connected with the inner wall of an output end shell (6).
2. The high power magnetic leakage prevention wireless charging system for mobile phones according to claim 1, characterized in that: the height of the protruding ends at the two ends of the first magnetic core (1) is equal and vertical to the core body between the two ends, and the height of the protruding ends at the two ends of the second magnetic core (3) is equal and vertical to the core body between the two ends.
3. The high power magnetic leakage prevention wireless charging system for mobile phones according to claim 1, characterized in that: the first magnetic core (1) and the second magnetic core (3) are made of any one of ferrite, amorphous and nanocrystalline strips, and have magnetic permeability larger than 500 and saturation induction larger than 200mT under the frequency of 30kHz-300 kHz.
4. The high power magnetic leakage prevention wireless charging system for mobile phones according to claim 1, characterized in that: the center of the first magnetic conductive sheet (7) and the center of the second magnetic conductive sheet (8) are provided with placing holes, the placing holes are the same as the shapes of the protruding ends at the two ends of the second magnetic core (3), and the thickness of the first magnetic conductive sheet (7) and the thickness of the second magnetic conductive sheet (8) are smaller than 0.2 mm.
5. The high power magnetic leakage prevention wireless charging system for mobile phones according to claim 1, characterized in that: the first magnetic conductive sheet (7) and the second magnetic conductive sheet (8) are made of any one of ferrite, amorphous and nanocrystalline strips, and have magnetic permeability larger than 2000 and saturation magnetic induction larger than 1000mT under the frequency of 30kHz-300 kHz.
6. The high power magnetic leakage prevention wireless charging system for mobile phones according to claim 1, characterized in that: the first magnetic conductive sheet (7) and the second magnetic conductive sheet (8) are in any one of a circular shape, an equilateral rectangle shape and an equilateral triangle shape.
7. Magnetic force positioning system, its characterized in that: the high-power magnetic leakage prevention mobile phone wireless charging system comprises the high-power magnetic leakage prevention mobile phone wireless charging system as claimed in any one of claims 1-6, a plurality of first magnetic blocks (9) and a plurality of second magnetic blocks (10), wherein the first magnetic blocks (9) and the second magnetic blocks (10) respectively surround the second magnetic core (3) and the first magnetic core (1) and are respectively fixed on the inner walls of the receiving end shell (5) and the output end shell (6).
8. The magnetic positioning system of claim 7, wherein: the S pole of the first magnetic block (9) is fixed to the inner wall of the receiving end shell (5), and the N pole of the second magnetic block (10) is fixed to the inner wall of the output end shell (6).
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| CN202110724537.2A CN113258686B (en) | 2021-06-29 | 2021-06-29 | High-power magnetic leakage prevention mobile phone wireless charging system and magnetic positioning system |
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| CN202110724537.2A CN113258686B (en) | 2021-06-29 | 2021-06-29 | High-power magnetic leakage prevention mobile phone wireless charging system and magnetic positioning system |
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| CN113258686B true CN113258686B (en) | 2021-09-21 |
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| CN106560902A (en) * | 2016-05-04 | 2017-04-12 | 中兴新能源汽车有限责任公司 | Magnetic core of transformer, transformer, and wireless charging device of automobile |
| US20180123392A1 (en) * | 2016-10-31 | 2018-05-03 | Apple Inc. | Wireless Charging System With Solenoids |
| WO2019235436A1 (en) * | 2018-06-07 | 2019-12-12 | 光電子株式会社 | Power reception device, experimental animal biological information acquisition device, and experimental animal biological information acquisition system |
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