CN114793023A - Wireless charging device based on magnetic coupling technology and magnetic material - Google Patents
Wireless charging device based on magnetic coupling technology and magnetic material Download PDFInfo
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- CN114793023A CN114793023A CN202210523421.7A CN202210523421A CN114793023A CN 114793023 A CN114793023 A CN 114793023A CN 202210523421 A CN202210523421 A CN 202210523421A CN 114793023 A CN114793023 A CN 114793023A
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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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Abstract
The invention relates to a wireless charging device based on a magnetic coupling technology and a magnetic material, which comprises: the coupling circuit comprises a transmitting coil, a first resonant capacitor, a receiving coil and a second resonant capacitor, the transmitting coil and the receiving coil are of an asymmetric structure, and the driving circuit, the coupling circuit and the energy receiving circuit are sequentially connected. The charging efficiency is improved based on the mode of the asymmetric coupling coil and the mounted iron-silicon-aluminum magnetic core, the load device is efficiently charged by virtue of the coil with smaller size, and meanwhile, the transmitting coil can radiate a certain space, so that the charging equipment can realize wireless charging in the certain space; the mounted iron-silicon-aluminum magnetic core can weaken the degree of magnetic lines of force dispersing into the air, and the transmission efficiency is further improved by the discovery that paired drift is generated when the magnetic permeability of the magnetic core at the receiving end changes.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a wireless charging device based on a magnetic coupling technology and a magnetic material.
Background
Wireless charging technology (Wireless charging technology) is derived from Wireless power transmission technology and can be divided into two modes of low-power Wireless charging and high-power Wireless charging. The low-power wireless charging is usually performed by electromagnetic induction, such as Qi charging for mobile phones, but the wireless charging for midrange electric vehicles is performed by induction. High-power wireless charging usually adopts a resonance mode (the mode is adopted by most electric vehicles) and energy is transmitted to a device for power utilization by a power supply device (a charger), and the device charges a battery by using received energy and is used for self operation. Because the charger and the electric device transmit energy by magnetic field, and the charger and the electric device are not connected by electric wires, the charger and the electric device can be exposed without conductive contacts.
In recent years, wireless charging technology has attracted more and more attention as the use of electronic products such as mobile phones and electric vehicles increases. Compared with the traditional wired charging mode, the wireless charging mode has the unique advantages of portability, safety and the like. At the end of the 19 th century, Tesla proposed a guess at wireless power transmission. For over a century thereafter, the study of wireless power transmission has never been stopped, and until 2007, Marin et al, the american college of massachusetts, proposed magnetic coupling resonant wireless power transmission, lighting a 60 watt bulb at a distance of two meters. This has caused the research on wireless power transmission to regain wide attention. However, for charging devices such as mobile phones, computers, smart wearing devices and the like, the so-called wireless charging of the devices also needs to align the built-in coil of the device with the charging seat, so that the device has a distance relative to the wireless charging in a real sense, and secondly, the design of the coil also has a place which can be optimized.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a wireless charging device based on a magnetic coupling technology and a magnetic material, which improves charging efficiency through an asymmetric coupling coil structure and a magnetic core magnetic ring, so that a load device can still obtain high charging efficiency when its own resonant coil has a small size; meanwhile, compared with a common contact type wireless charging device, the device can provide wireless charging in a certain space, so that 'wireless charging' is realized in a real sense; meanwhile, the iron-silicon-aluminum magnetic core is skillfully mounted, the degree of magnetic lines of force dispersing into the air can be weakened, and the efficiency of wireless power transmission can be further improved by finding that paired drift is generated when the magnetic permeability of the magnetic core is changed by the output voltage peak value of the receiving end.
In order to realize the purpose, the invention is realized by the following technical scheme:
the device comprises a driving circuit, a coupling circuit and an energy receiving circuit;
the coupling circuit comprises a transmitting coil, a first resonant capacitor, a receiving coil and a second resonant capacitor;
the transmitting coil and the receiving coil are in an asymmetric structure;
the driving circuit, the coupling circuit and the energy receiving circuit are connected in sequence.
Preferably, the driving circuit comprises a frequency-modulated power supply and a source coil; the energy receiving circuit comprises a load and a load coil, wherein the frequency modulation power supply is used for supplying current to the source coil.
Preferably, the frequency-modulated power supply is connected with the source coil to form a loop, the transmitter coil is connected with the first resonant capacitor to form a loop, the load is connected with the load coil to form a loop, and the receiver coil is connected with the second resonant capacitor to form a loop.
Preferably, the source coil, the transmitting coil, the receiving coil and the load coil are wound by copper enameled wires, and the number of winding turns of the transmitting coil is the same as that of the receiving coil.
Preferably, electric energy is transferred between the source coil and the transmitting coil and between the receiving coil and the load coil through electromagnetic induction, and electric energy is transferred between the transmitting coil and the receiving coil through magnetic coupling resonance.
Preferably, the transmitting coil diameter is larger than the receiving coil diameter.
Preferably, a first magnetic core is mounted at the center of the transmitting coil, and a second magnetic core is mounted at the center of the receiving coil, wherein the first magnetic core and the second magnetic core are high permeability magnetic cores.
Preferably, a loop formed by the transmitting coil and the first resonant capacitor and a loop formed by the receiving coil and the second resonant capacitor form a resonant circuit.
Preferably, the frequency of the frequency modulated power supply is equal to the resonant frequency of the resonant circuit.
Preferably, the capacitance of the transmitting coil and the capacitance of the receiving coil are resonance capacitances with the same basic parameters, wherein the basic parameters include voltage, capacitance, loss factor, equivalent series resistance, temperature coefficient, operating temperature range and leakage current.
The invention has the beneficial effects that: in the field of magnetic coupling power transmission, based on a magnetic coupling technology and a magnetic material, the charging efficiency is improved in a mode of creatively introducing a magnetic core material and an asymmetric coupling coil at the same time, so that the size of a receiving coil is reduced, the requirement of wireless charging on the internal space of equipment is reduced, and the design of a transmitting coil can enable the charging space to radiate to a certain space, so that multiple equipment in a certain area can be charged at the same time; meanwhile, through the design of the asymmetric coupling coil with the magnetic material, the characteristic that the change rate of the magnetic induction intensity is subjected to paired drift in space is realized by utilizing the magnetic core material, the charging efficiency is further improved, and therefore the high-efficiency wireless charging is realized in the real sense.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an asymmetric structure (containing magnetic cores) magnetic coupling wireless power transmission device according to an embodiment of the invention.
Fig. 2 is a graph of peak received signal versus distance for symmetric (no core) and asymmetric (no core) magnetic coupling wireless power transmission devices according to an embodiment of the present invention.
Fig. 3 is a graph of peak-to-distance relationship of received signals of an asymmetric (coreless) and asymmetric (coreless) magnetically coupled wireless power transmission apparatus according to an embodiment of the present invention.
Fig. 4 is a graph of the peak value of the received signal versus the distance of the magnetic coupling wireless power transmission device with a symmetric structure (containing magnetic cores) and an asymmetric structure (containing magnetic cores) according to the embodiment of the invention.
Wherein: firstly, frequency modulation power supply; a source coil; thirdly, transmitting a coil; a first resonant capacitor; a first magnetic core; sixthly, loading; seventhly, loading a coil; eighthly, receiving coils; ninthly, a second resonance capacitance; a second core in the R;
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
According to fig. 1, the present embodiment provides a wireless charging device based on a magnetic coupling technology and a magnetic material, including a device composed of a driving circuit, a coupling circuit, and an energy receiving circuit, where the driving circuit includes a frequency modulation power supply 1 and a source coil 2, the energy receiving circuit includes a load 6 and a load coil 7, the coupling circuit includes a transmitting coil 3, a first resonant capacitor 4, a receiving coil 8, and a second resonant capacitor 9, and the driving circuit, the coupling circuit, and the energy receiving circuit are connected in sequence. The frequency modulation power supply 1 is connected with the source coil 2 to form a loop, and the transmitting coil 3 is connected with the first resonant capacitor 4 to form a loop; the load 6 is connected with the load coil 7 to form a loop, the receiving coil 8 is connected with the second resonant capacitor 9 to form a loop, and the frequency modulation power supply 1 is at least provided with one group of coils for providing current for the source coil 2. The transmitting coil 3 and the receiving coil 8 are in an asymmetric structure, and the first magnetic core 5 is mounted in the center of the transmitting coil 3, and the second magnetic core 10 is mounted in the center of the receiving coil 8.
The first magnetic core 5 having a high magnetic permeability is mounted in the center of the transmission coil 3, and the magnetic core 10 having a high magnetic permeability is mounted in the center of the transmission coil 3.
The source coil 2, the transmitting coil 3, the receiving coil 8 and the load coil 7 are formed by winding copper enameled wires, and the number of winding turns of the transmitting coil 3 is the same as that of the receiving coil 8.
Electric energy is transmitted between the source coil 2 and the transmitting coil 3 and between the receiving coil 8 and the load coil 7 through electromagnetic induction, and electric energy is transmitted between the transmitting coil 3 and the receiving coil 8 through magnetic coupling resonance.
And a loop formed by the transmitting coil 3 and the first resonant capacitor 4 and a loop formed by the receiving coil 8 and the second resonant capacitor 9 form a resonant circuit, and the frequency of the frequency modulation power supply is equal to the resonant frequency of the resonant circuit.
The frequency of the frequency-modulated power supply 1 is equal to the resonance frequency of the resonance circuit.
The first resonant capacitor 4 and the second resonant capacitor 9 are resonant capacitors with the same basic parameters, wherein the basic parameters include voltage, capacitance, loss factor, equivalent series resistance, temperature coefficient, working temperature range and leakage current.
The first magnetic core 5 and the second magnetic core 10 are iron silicon aluminum magnetic rings. The iron-silicon-aluminum material has low hysteresis coefficient, high magnetic induction intensity, small magnetic loss and good direct current superposition, and can pass large current. The iron-silicon-aluminum series magnetic core has the characteristics of low magnetic loss and no aging. The magnetic permeability μ is a ratio of B to H corresponding to any point on the hysteresis loop, and is a physical quantity representing magnetization performance. According to the graph shown in fig. 4, two values of B correspond to one value of H on the curve of the magnetic hysteresis loop of the sendust core, which indicates that two sendust cores with different magnetic permeability may correspond to the same H of the magnetic hysteresis loop during wireless power transmission, so that the influence effect of the two cores on the magnetic field during wireless power transmission is similar.
Example 2
According to fig. 2 to 3, the present embodiment provides a wireless charging device based on a magnetic coupling technology and a magnetic material, including a driving circuit, a coupling circuit, and an energy receiving circuit, where the driving circuit includes a frequency modulation power supply 1 and a source coil 2, the energy receiving circuit includes a load 6 and a load coil 7, the coupling circuit includes a transmitting coil 3, a first resonant capacitor 4, a receiving coil 8, and a second resonant capacitor 9, and the driving circuit, the coupling circuit, and the energy receiving circuit are connected in sequence. The frequency modulation power supply 1 is connected with the source coil 2 to form a loop, and the transmitting coil 3 is connected with the first resonant capacitor 4 to form a loop; the load 5 is connected with the load coil 7 to form a loop, the receiving coil 8 is connected with the second resonant capacitor 9 to form a loop, and the frequency modulation power supply 1 is at least provided with one group of coils for providing current for the source coil 2. The transmitting coil 3 and the receiving coil 8 are asymmetric, and a first magnetic core 5 is mounted in the center of the transmitting coil 3 and a second magnetic core 10 is mounted in the center of the receiving coil 8.
The magnetic core 5 and the magnetic core 10 are high-permeability magnetic cores and used as media, the degree of magnetic lines of force dispersing into the air is weakened, and the transmission efficiency is improved.
As can be seen from fig. 2, when the distance between the two coils and other conditions are fixed, the peak value of the output voltage of the receiving terminal with the asymmetric structure is higher than that of the receiving terminal with the symmetric structure, so that the magnetic induction intensity changes faster and the transmission efficiency is higher.
As can be seen from fig. 3, when the asymmetric structure is adopted, the output of the signal at the transmitting end can be enhanced by increasing the size of the transmitting coil, so that the magnetization intensity of the magnetic core embedded in the transmitting end can be enhanced, which is different from the symmetric structure.
In the field of magnetic coupling power transmission, based on a magnetic coupling technology and a magnetic material, the charging efficiency is improved in a mode of creatively introducing a magnetic core material and an asymmetric coupling coil at the same time, so that the size of a receiving coil is reduced, the requirement of wireless charging on the internal space of equipment is reduced, and the design of a transmitting coil can enable the charging space to radiate to a certain space, so that multiple equipment in a certain area can be charged at the same time; meanwhile, through the design of the asymmetric coupling coil with the magnetic material, the characteristic that the change rate of the magnetic induction intensity is subjected to paired drift in space is realized by utilizing the magnetic core material, the charging efficiency is further improved, and the high-efficiency wireless charging in the true sense is realized.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A wireless charging device based on magnetic coupling technology and magnetic materials, characterized by comprising:
the device comprises a driving circuit, a coupling circuit and an energy receiving circuit;
the coupling circuit comprises a transmitting coil (3), a first resonant capacitor (4), a receiving coil (8) and a second resonant capacitor (9);
the transmitting coil (3) and the receiving coil (8) are in an asymmetric structure;
the driving circuit, the coupling circuit and the energy receiving circuit are connected in sequence.
2. The wireless charging device based on magnetic coupling technology and magnetic material according to claim 1, characterized in that the driving circuit comprises a frequency-modulated power supply (1) and a source coil (2); the energy receiving circuit comprises a load (6) and a load coil (7), wherein the frequency-modulated power supply (1) is used for supplying current to the source coil (2).
3. The wireless charging device based on magnetic coupling technology and magnetic material according to claim 2, characterized in that the frequency-modulated power source (1) is connected with the source coil (2) to form a loop, the transmitting coil (3) is connected with the first resonant capacitor (4) to form a loop, the load (6) is connected with the load coil (7) to form a loop, and the receiving coil (8) is connected with the second resonant capacitor (9) to form a loop.
4. The wireless charging device based on the magnetic coupling technology and the magnetic material according to claim 3, wherein the source coil (2), the transmitting coil (3), the receiving coil (8) and the load coil (7) are made of copper enameled wires by winding, and the number of winding turns of the transmitting coil (3) is the same as that of the receiving coil (8).
5. The wireless charging device based on magnetic coupling technology and magnetic material according to claim 4, characterized in that electric energy is transferred between the source coil (2) and the transmitting coil (3) and between the receiving coil (8) and the load coil (7) through electromagnetic induction, and electric energy is transferred between the transmitting coil (3) and the receiving coil (8) through magnetic coupling resonance.
6. Wireless charging device based on magnetic coupling technology and magnetic material according to claim 1, characterized in that the diameter of the transmitting coil (3) is larger than the diameter of the receiving coil (8).
7. Wireless charging device based on magnetic coupling technology and magnetic material according to claim 1, characterized in that the transmitting coil (3) centrally carries a first magnetic core (5) and the receiving coil (8) centrally carries a second magnetic core (10), wherein the first magnetic core (5) and the second magnetic core (10) are high permeability magnetic cores.
8. The wireless charging device based on magnetic coupling technology and magnetic material according to claim 1, characterized in that the loop of the transmitting coil (3) and the first resonant capacitor (4) and the loop of the receiving coil (8) and the second resonant capacitor (9) form a resonant circuit.
9. Wireless charging device based on magnetic coupling technology and magnetic material according to claim 8, characterized in that the frequency of the frequency modulated power supply (1) is equal to the resonance frequency of the resonance circuit.
10. The wireless charging device based on magnetic coupling technology and magnetic material according to claim 1, characterized in that the capacitance of the transmitting coil (3) and the receiving coil (8) is a resonance capacitance with the same basic parameters, wherein the basic parameters comprise voltage, capacitance, loss factor, equivalent series resistance, temperature coefficient, operating temperature range and leakage current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210523421.7A CN114793023A (en) | 2022-05-13 | 2022-05-13 | Wireless charging device based on magnetic coupling technology and magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210523421.7A CN114793023A (en) | 2022-05-13 | 2022-05-13 | Wireless charging device based on magnetic coupling technology and magnetic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114793023A true CN114793023A (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210523421.7A Pending CN114793023A (en) | 2022-05-13 | 2022-05-13 | Wireless charging device based on magnetic coupling technology and magnetic material |
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| Country | Link |
|---|---|
| CN (1) | CN114793023A (en) |
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- 2022-05-13 CN CN202210523421.7A patent/CN114793023A/en active Pending
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