CN112436578A - Magnetic coupling resonant wireless charging system with reconfigurable frequency and charging method - Google Patents
Magnetic coupling resonant wireless charging system with reconfigurable frequency and charging method Download PDFInfo
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- CN112436578A CN112436578A CN202011404360.XA CN202011404360A CN112436578A CN 112436578 A CN112436578 A CN 112436578A CN 202011404360 A CN202011404360 A CN 202011404360A CN 112436578 A CN112436578 A CN 112436578A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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 magnetic coupling resonant wireless charging system with reconfigurable frequency and a charging method, belonging to the technical field of wireless charging systems and charging methods. The power supply device comprises a feed coil, a primary resonance coil, a metamaterial plate with reconfigurable frequency, a secondary resonance coil and a load coil which are sequentially arranged on the same central line; the frequency-reconfigurable metamaterial plate, the primary resonance coil and the secondary resonance coil are jointly used for dynamically improving the transmission efficiency of the wireless charging system, the frequency-reconfigurable ranges of the metamaterial plate, the primary resonance coil and the secondary resonance coil are the same, the frequency-reconfigurable frequency points are in one-to-one correspondence, and wireless charging of loads with different frequencies is achieved. The beneficial technical effects are as follows: the metamaterial plate and the magnetic coupling resonant wireless charging system have a frequency reconfigurable function by changing the capacitance value of the adjustable varactor, the energy transmission efficiency of the system under different frequencies is dynamically improved, loads of different frequencies can be selectively and efficiently wirelessly powered, and the system has the advantages of low cost and high efficiency.
Description
Technical Field
The invention relates to a magnetic coupling resonant wireless charging system with reconfigurable frequency and a charging method, belonging to the technical field of wireless charging systems and charging methods.
Background
The magnetic coupling resonant wireless charging technology can realize wireless charging with longer distance and higher efficiency, and has good development prospect. The traditional magnetic coupling resonance type wireless charging system can only wirelessly charge a load with a single frequency. When loads with different frequencies need to be charged wirelessly, a plurality of wireless charging systems with different working frequencies are needed, the cost of the system is increased, great space is wasted and the wireless charging systems are not beneficial to users to use, the wireless charging systems have a frequency reconfigurable function through a frequency reconfigurable method, the loads with different frequencies can be charged wirelessly in a frequency selective mode, the cost of the system is greatly reduced, and the requirements of the users are met. When the transmission distance is relatively long, the energy transmission efficiency of the traditional magnetic coupling resonant wireless charging system is low, the metamaterial has negative magnetic conductivity, the magnetic field can be regulated and controlled, and the transmission efficiency of the system can be improved due to the use of the metamaterial. In order to realize high-efficiency selective power supply of loads with different frequencies, a frequency reconfigurable metamaterial is introduced to dynamically improve the energy transmission efficiency of a frequency reconfigurable magnetic coupling resonant wireless charging system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnetic coupling resonant wireless charging system with reconfigurable frequency and a charging method.
The invention adopts the following technical scheme: the power supply device comprises a feed coil, a primary resonance coil, a metamaterial plate with reconfigurable frequency, a secondary resonance coil and a load coil which are sequentially arranged on the same central line;
the feed coil and the primary resonance coil are respectively arranged on two sides of the metamaterial plate with reconfigurable frequency with the load coil and the secondary resonance coil;
the feed coil, the load coil, the primary resonance coil and the secondary resonance coil are all formed by arranging a planar spiral coil on a dielectric plate; the medium plate is FR4 glass fiber cloth base;
the feed coil is connected to an alternating current power supply with adjustable frequency,
two ends of the primary resonance coil and the secondary resonance coil are respectively connected with an adjustable capacitor, and the primary resonance coil and the secondary resonance coil realize the frequency reconstruction function by changing the capacitance value of the adjustable capacitor;
the load coil is connected to the load and supplies power to the load;
the metamaterial plate with reconfigurable frequency is formed by arranging at least two planar spiral coils periodically to form a planar spiral coil array and placing the planar spiral coil array on a dielectric slab; an adjustable capacitor is connected between two ports of each planar spiral coil in the planar spiral coil array; the frequency reconfigurable metamaterial plate realizes the frequency reconfiguration function by changing the capacitance value of the adjustable capacitor; the medium plate is FR4 glass fiber cloth base;
the frequency-reconfigurable metamaterial plate, the primary resonance coil and the secondary resonance coil are jointly used for dynamically improving the transmission efficiency of the wireless charging system, the frequency-reconfigurable ranges of the metamaterial plate, the primary resonance coil and the secondary resonance coil are the same, the frequency-reconfigurable frequency points are in one-to-one correspondence, and wireless charging of loads with different frequencies is achieved.
Furthermore, wireless energy transfer is performed between the feed coil and the primary resonance coil in an electromagnetic induction mode, and wireless energy transfer is performed between the secondary resonance coil and the load coil in an electromagnetic induction mode; the primary resonance coil and the secondary resonance coil are wirelessly transmitted with energy in a magnetic coupling resonance mode, and the metamaterial plate with reconfigurable frequency is arranged between the primary resonance coil and the secondary resonance coil and used for dynamically improving the wireless energy transmission efficiency under different working frequencies.
Furthermore, the number of turns of the feed coil is the same as that of the load coil; the primary resonance coil and the secondary resonance coil have the same number of turns.
Furthermore, the planar spiral coil is connected to two end points of the lower surface of the dielectric plate through copper pillar via holes at the starting point and the end point of the upper surface of the dielectric plate to form a port of the planar spiral coil.
A magnetic coupling resonant wireless charging method with reconfigurable frequency comprises the following charging steps:
step 1, a frequency-adjustable alternating current power supply provides alternating current with variable frequency for a feed coil;
step 4, the primary resonance coil provides frequency-adjustable current with the same frequency to the secondary resonance coil in a magnetic coupling resonance mode;
and 6, supplying power to loads with different frequencies by the load coil.
Compared with the prior art, the invention has the beneficial technical effects that: the metamaterial plate and the magnetic coupling resonant wireless charging system have a frequency reconfigurable function by changing the capacitance value of the adjustable varactor, the frequency reconfigurable metamaterial plate is placed between primary and secondary resonance coils of the frequency reconfigurable magnetic coupling resonant wireless charging system, the energy transmission efficiency of the system under different frequencies is dynamically improved, loads of different frequencies can be selectively and efficiently wirelessly powered, and the system has the advantages of low cost and high efficiency.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic front view of a plate of frequency reconfigurable metamaterial.
FIG. 3 is a schematic diagram of the back side of a frequency reconfigurable metamaterial plate.
Fig. 4 is a schematic front view of the feed coil, the load coil, the primary resonance coil, and the secondary resonance coil.
Fig. 5 is a rear view of the primary resonance coil and the secondary resonance coil.
Fig. 6 is a rear view of the feeding coil and the loading coil.
Fig. 7 is a graph of energy transfer efficiency versus resonant frequency.
Detailed Description
The preferred embodiment of the present invention is further described in detail with reference to fig. 1 to 7, and includes a feeding coil 1, a primary resonant coil 2, a metamaterial plate 3 with reconfigurable frequency, a secondary resonant coil 4 and a loading coil 5, which are sequentially arranged on the same center line;
the feed coil 1 and the primary resonance coil 2 are respectively arranged at two sides of the metamaterial plate 3 with reconfigurable frequency, together with the load coil 5 and the secondary resonance coil 4;
the feed coil 1, the load coil 5, the primary resonance coil 2 and the secondary resonance coil 4 are all formed by arranging a planar spiral coil 100 on a dielectric plate 200; the dielectric plate 200 is made of FR4 fiberglass cloth base;
the feed coil 1 is connected to an alternating current source of adjustable frequency,
two ends of the primary resonance coil 2 and the secondary resonance coil 4 are respectively connected with an adjustable capacitor 300, and the primary resonance coil 2 and the secondary resonance coil 4 realize the function of frequency reconstruction by changing the capacitance value of the adjustable capacitor 300;
the load coil 5 is connected to a load and supplies power to the load;
the metamaterial plate 3 with reconfigurable frequency is formed by arranging at least two planar spiral coils 100 periodically, forming a planar spiral coil array and placing the planar spiral coil array on a dielectric plate 200; an adjustable capacitor 300 is connected between two ports of each planar spiral coil 100 in the planar spiral coil array; the frequency reconfigurable metamaterial plate 3 realizes the frequency reconfiguration function by changing the capacitance value of the adjustable capacitor 300; the dielectric plate 200 is made of FR4 fiberglass cloth base;
the frequency-reconfigurable metamaterial plate 3, the primary resonance coil 2 and the secondary resonance coil 4 are jointly used for dynamically improving the transmission efficiency of the wireless charging system, the frequency reconfigurable ranges of the three are the same, the frequency reconfigurable frequency points correspond to one another, and wireless charging of loads with different frequencies is achieved.
In this embodiment, the frequency reconfigurable metamaterial plate 3 is a coil array formed by four planar spiral coils 100, the four planar spiral coils 100 are all located on a FR4 fiberglass cloth-based dielectric slab 200, and the schematic structural diagrams thereof are shown in fig. 2 and 3. An adjustable capacitor 300 is placed between two ports of the planar spiral coil 100, and the adjustable capacitor 300 is connected between two ports of each planar spiral coil 100 in the planar spiral coil array. The frequency reconfigurable function of the frequency reconfigurable metamaterial plate 3 is realized by changing the capacitance value of the adjustable capacitor 300, and the frequency reconfigurable metamaterial plate 3 is arranged between the primary resonance coil 2 and the secondary resonance coil 4 and used for dynamically improving the wireless energy transmission efficiency of the metamaterial-based high-efficiency frequency reconfigurable magnetic coupling resonant wireless charging system under different working frequencies.
Furthermore, energy is wirelessly transmitted between the feed coil 1 and the primary resonance coil 2 in an electromagnetic induction mode, and energy is wirelessly transmitted between the secondary resonance coil 4 and the load coil 5 in an electromagnetic induction mode; the primary resonance coil 2 and the secondary resonance coil 4 are wirelessly conducted energy transmission in a magnetic coupling resonance mode, and the metamaterial plate 3 with reconfigurable frequency is arranged between the primary resonance coil 2 and the secondary resonance coil 4 and used for dynamically improving wireless energy transmission efficiency under different working frequencies.
Further, the feed coil 1 and the load coil 5 have the same number of turns; the primary resonance coil 2 and the secondary resonance coil 4 have the same number of turns.
The primary resonance coil 2 and the secondary resonance coil 4 may have different sizes and shapes, and the power supply coil 1 and the load coil 5 may have different sizes and shapes, and preferably, the power supply coil 1, the primary resonance coil 2, the secondary resonance coil 4, and the load coil 5 have the same number of turns. The primary resonance coil 2, the secondary resonance coil 4, the feed coil 1 and the load coil 5 are not limited in winding manner, may be single-layer or multi-layer, and the number of turns thereof is not limited, and may be selected as required. In this embodiment, the primary resonance coil 2, the secondary resonance coil 4, the feed coil 1, and the load coil 5 are all single-layer coils, four turns of which are all planar square spiral coils.
Further, the planar spiral coil 100 is connected to two end points of the lower surface of the dielectric board through copper pillar vias at the starting point and the ending point of the upper surface of the dielectric board 200 to form a port of the planar spiral coil 100.
A magnetic coupling resonant wireless charging method with reconfigurable frequency comprises the following charging steps:
step 1, a frequency-adjustable alternating current power supply provides alternating current with variable frequency for a feed coil 1;
step 4, the primary resonance coil 2 provides the secondary resonance coil 4 with frequency-adjustable current with the same frequency in a magnetic coupling resonance mode;
and 6, supplying power to loads with different frequencies by the load coil 5.
When the power transmission device works, the feed coil 1 is connected with the alternating current power supply, the load coil 5 is connected with a load, the alternating current power supply supplies power to the feed coil 1, the primary resonance coil 2 receives energy emitted outwards by the feed coil 1 in an electromagnetic induction mode, the primary resonance coil 2 and the secondary resonance coil 4 realize wireless energy transmission through magnetic coupling resonance, and the load coil 1 receives energy emitted by the secondary resonance coil 4 through electromagnetic induction and transmits the energy to the load. The resonant frequency of the frequency reconfigurable magnetic coupling resonant wireless charging system is changed by changing the capacitance value of the adjustable capacitor 300 connected at the ports of the primary resonant coil 2 and the secondary resonant coil 4. The frequency reconfigurable metamaterial plate 3 changes the operating frequency of the frequency reconfigurable metamaterial plate 3 by changing the capacitance value of the adjustable capacitor 300 connected to the two ends of the planar spiral coil 100, as shown in fig. 3. In this embodiment, the frequency reconfigurable ranges of the frequency reconfigurable metamaterial plate 3 and the frequency reconfigurable frequency point of the frequency reconfigurable magnetic coupling resonant wireless charging system are the same and the frequency reconfigurable frequency points are in one-to-one correspondence by changing the capacitance values of the adjustable capacitors 300 connected at the ports of the primary resonant coil 2 and the secondary resonant coil 4 and the capacitance values of the adjustable capacitors 300 connected at the two ends of the planar spiral coil 100 of the frequency reconfigurable metamaterial plate 3; the system has different working frequencies, and the energy transmission efficiency of the system under different frequencies is dynamically improved through the frequency reconfigurable metamaterial plate 3.
When the capacitance values of the adjustable varactor 300 are 20 pf, 25 pf, 30 pf, 35 pf, 40 pf, 45 pf and 50 pf respectively, the resonant frequencies of the magnetic coupling resonant wireless charging system based on the high-efficiency frequency reconfigurable metamaterial are 19.3 MHz, 17.5 MHz, 16.2 MHz, 15 MHz, 14.1 MHz, 13.5 MH and 12.7 MHz respectively, the change curves of the front and rear transmission efficiencies of the corresponding loading frequency reconfigurable metamaterial plate 3 along with the resonant frequency of the system are shown in fig. 7, and after the frequency reconfigurable metamaterial plate 3 is loaded, the energy transmission efficiency of the system is obviously improved.
It is obvious that the above described embodiment is only one embodiment of the present invention, not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention. Compared with the prior art, the invention has the beneficial technical effects that: the metamaterial plate and the magnetic coupling resonant wireless charging system have a frequency reconfigurable function by changing the capacitance value of the adjustable varactor, the frequency reconfigurable metamaterial plate is placed between primary and secondary resonance coils of the frequency reconfigurable magnetic coupling resonant wireless charging system, the energy transmission efficiency of the system under different frequencies is dynamically improved, loads of different frequencies can be selectively and efficiently wirelessly powered, and the system has the advantages of low cost and high efficiency.
Claims (4)
1. A magnetic coupling resonant wireless charging system with reconfigurable frequency is characterized in that:
the power supply device comprises a feed coil, a primary resonance coil, a metamaterial plate with reconfigurable frequency, a secondary resonance coil and a load coil which are sequentially arranged on the same central line;
the feed coil and the primary resonance coil are respectively arranged on two sides of the metamaterial plate with reconfigurable frequency with the load coil and the secondary resonance coil;
the feed coil, the load coil, the primary resonance coil and the secondary resonance coil are all formed by arranging a planar spiral coil on a dielectric plate; the medium plate is FR4 glass fiber cloth base;
the feed coil is connected to an alternating current power supply with adjustable frequency,
two ends of the primary resonance coil and the secondary resonance coil are respectively connected with an adjustable capacitor, and the primary resonance coil and the secondary resonance coil realize the frequency reconstruction function by changing the capacitance value of the adjustable capacitor;
the load coil is connected to the load and supplies power to the load;
the metamaterial plate with reconfigurable frequency is formed by arranging at least two planar spiral coils periodically to form a planar spiral coil array and placing the planar spiral coil array on a dielectric slab; an adjustable capacitor is connected between two ports of each planar spiral coil in the planar spiral coil array; the frequency reconfigurable metamaterial plate realizes the frequency reconfiguration function by changing the capacitance value of the adjustable capacitor; the medium plate is FR4 glass fiber cloth base;
the frequency-reconfigurable metamaterial plate, the primary resonance coil and the secondary resonance coil are jointly used for dynamically improving the transmission efficiency of the wireless charging system, the frequency-reconfigurable ranges of the metamaterial plate, the primary resonance coil and the secondary resonance coil are the same, the frequency-reconfigurable frequency points are in one-to-one correspondence, and wireless charging of loads with different frequencies is achieved.
2. A frequency reconfigurable magnetic coupling resonant wireless charging system according to claim 1, wherein: the feeding coil and the primary resonance coil conduct wireless energy transfer in an electromagnetic induction mode, and the secondary resonance coil and the load coil conduct wireless energy transfer in an electromagnetic induction mode; the primary resonance coil and the secondary resonance coil are wirelessly transmitted with energy in a magnetic coupling resonance mode, and the metamaterial plate with reconfigurable frequency is arranged between the primary resonance coil and the secondary resonance coil and used for dynamically improving the wireless energy transmission efficiency under different working frequencies.
3. A frequency reconfigurable magnetic coupling resonant wireless charging system according to claim 1, wherein: the planar spiral coil is connected to two end points of the lower surface of the dielectric plate at the starting point and the end point of the upper surface of the dielectric plate through copper pillar via holes to form a port of the planar spiral coil.
4. A magnetic coupling resonant wireless charging method with reconfigurable frequency is characterized by comprising the following charging steps:
step 1, a frequency-adjustable alternating current power supply provides alternating current with variable frequency for a feed coil;
step 2, the feed coil provides a frequency-adjustable current with the same frequency as the feed coil to the primary resonance coil in an electromagnetic induction mode;
step 3; in the process that the primary resonance coil transmits energy to the secondary resonance coil, the frequency-reconfigurable metamaterial plate regulates and controls an electromagnetic field emitted by the primary resonance coil, so that electromagnetic energy emitted by the primary resonance coil is concentrated, and the secondary resonance coil receives more energy;
step 4, the primary resonance coil provides frequency-adjustable current with the same frequency to the secondary resonance coil in a magnetic coupling resonance mode;
step 5, the secondary resonance coil provides the load coil with frequency-adjustable alternating current with the same frequency in an electromagnetic induction mode;
and 6, supplying power to loads with different frequencies by the load coil.
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| CN202011404360.XA CN112436578A (en) | 2020-12-04 | 2020-12-04 | Magnetic coupling resonant wireless charging system with reconfigurable frequency and charging method |
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| CN202011404360.XA CN112436578A (en) | 2020-12-04 | 2020-12-04 | Magnetic coupling resonant wireless charging system with reconfigurable frequency and charging method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113472093A (en) * | 2021-08-10 | 2021-10-01 | 大连海事大学 | Intelligent desktop wireless power transmission system based on coupling double-resonant-ring metamaterial |
| CN115097364A (en) * | 2022-07-25 | 2022-09-23 | 国仪量子(合肥)技术有限公司 | Frequency-variable modulation field system, control method thereof and EPR spectrometer |
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Application publication date: 20210302 |