CN203537076U - Variable-coupling coefficient magnetic resonance wireless power transmission system - Google Patents
Variable-coupling coefficient magnetic resonance wireless power transmission system Download PDFInfo
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- CN203537076U CN203537076U CN201320552307.3U CN201320552307U CN203537076U CN 203537076 U CN203537076 U CN 203537076U CN 201320552307 U CN201320552307 U CN 201320552307U CN 203537076 U CN203537076 U CN 203537076U
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Abstract
The utility model discloses a variable-coupling coefficient magnetic resonance wireless power transmission system and mainly solves the problem that the transmission efficiency of the magnetic resonance wireless power transmission system can sharply decrease as the transmission distance increases. By simultaneously adjusting the distance between a source coil and a transmitting coil and the distance between a receiving coil and a load coil, the magnetic resonance wireless power transmission system can meet a critical coupling condition equation and work in a critical coupling state. Conditions which need to be met by the critical coupling state of the system are accurately obtained, so that the magnetic resonance wireless power transmission system can always work in a high-efficiency mode.
Description
Technical field
The utility model belongs to magnetic coupling resonance wireless power transmission technical field, relate to a kind of change coupling coefficient magnetic resonance radio energy transmission system, relate in particular to a kind of system that improves efficiency of transmission and distance by changing the coupling coefficient of magnetic coupling resonance radio energy transmission system transmitter and receiver.
Background technology
After Ni Gula tesla proposed wireless power transmission theory before a century, wireless power transmission is just the focus that people study always.Expert is carrying out the research of wireless power transmission always both at home and abroad for many years, but development of scientific research is slow all the time, until in June, 2007, the physics professor Marin Soljacic of the Massachusetts Institute of Technology (MIT) and group member thereof propose a kind of brand-new scheme based on strong magnetic coupling magnetic resonance, in experiment, using two diameters is 60cm, coil by copper wire winding, and make the natural resonance frequency of coil in 9.9MHz, utilize magnetic coupling resonance principle successfully to light a 60W bulb from the about 2m of power supply, this technology was called as WiTricity afterwards, so far, opened up the research grand occasion of wireless power transmission technology.For wireless power transmission technology is applied as early as possible, on September 1st, 2010, standardization body--(the Wireless Power Consortium of wireless charging alliance of the first promotion wireless charging technology in the whole world, WPC) in Beijing, announce Qi wireless charging international standard to take the lead in introducing China, the compatible quality monitoring of Ministry of Information Industry's communication electromagnetism center also adds this tissue, wherein Shenzhen Sang Fei Consumer Communications Co is the supporter of Qi standard, a unique Chinese Enterprise in the executive director member of Ye Shigai alliance.
The realization of wireless power transmission has three kinds of modes both at home and abroad at present:
1. induction---be similar to loosely coupled transformer, by the electromagnetic induction generation current of primary and secondary coil, thereby energy be transported to receiving terminal from transmitting terminal, the short range transmission that applicable efficiency is higher.
2. electromagnetic radiation formula---its basic principle is similar to the crystal receiver of early application, has at present relatively ripe theory, and sphere of action is wide, delivering power is large, but biotic environment is affected to large and inefficiency.
3. magnetic coupling is resonant---the brand-new scheme that the Marin Soljacic of the Massachusetts Institute of Technology and group member thereof propose, its principle is to utilize the non-radiative near-field coupling in magnetic field to carry out transferring energy, reduced to a great extent the injury to human body, extended the distance of wireless power transmission, this mode efficiency of transmission is high, distance, power are large, is the main flow direction of following wireless power transmission development.
Magnetic coupling resonance radio energy transmission system, is to resonate transferring energy by magnetic coupling between the coil of two symmetrical configuration, the efficiency of transmission important of coupling coefficient to system.According to the size of coupling coefficient, magnetic coupling resonance radio energy transmission system can be divided into three kinds of working regions: close coupling, Critical Coupling, weak coupling.
Research is found when radio energy transmission system is during in close coupling region, the efficiency of transmission of system obtains maximum in resonance frequency both sides, it is frequency of occurrences division, increase along with transmission range, coupling coefficient reduces, frequency splitting phenomenon fades away, when coupling coefficient meets Critical Coupling condition, the efficiency of transmission of system obtains maximum at resonance frequency place, while further reducing to reach weak coupling region along with coupling coefficient, the efficiency of transmission of system reduces and sharply declines with coupling coefficient, but the transmission state of system the best is at resonance frequency place all the time.
Therefore the efficiency of transmission of radio energy transmission system not under resonance frequency always in maximum, but there is maximum efficiency of transmission and optimum transmission range at Critical Coupling state place.
In sum, the optimum Working of magnetic coupling resonance radio energy transmission system be system all the time in Critical Coupling state, system just can obtain at resonance frequency place maximum efficiency of transmission and optimum transmission range like this.But the corresponding transmission range of Critical Coupling state is determined, this just makes the system can not be all the time in Critical Coupling state, and transmission range has regulating action clearly to coupling coefficient, increase along with transmission range, cause reducing of coupling coefficient, the system efficiency of transmission finally causing sharply declines, seriously hindered the universal and application of radio energy transmission system, for this reason, we must find a kind of technical method to realize such scheme---and allow system all the time in Critical Coupling state, to obtain maximum efficiency of transmission and optimum transmission range.
Utility model content
Technical problem: the purpose of this utility model is the increase along with transmission range for magnetic coupling resonance radio energy transmission system, reducing of coupling coefficient and the problem that causes system efficiency of transmission sharply to decline, and the system of considering obtains maximum efficiency of transmission and optimum transmission range, a kind of change coupling coefficient magnetic resonance radio energy transmission system of proposition at Critical Coupling place.This system is by the coupling coefficient of while regulating system transmitter and receiver, make system all the time in Critical Coupling state, there is maximum efficiency of transmission and optimum transmission range, the utility model can significantly improve distance and the efficiency of wireless power transmission simultaneously, can meet well the requirement of equipment to radio energy transmission system efficiency and distance.
For realizing above-mentioned target, the technical scheme of realization of the present utility model is as follows:
A kind of change coupling coefficient magnetic resonance radio energy transmission system described in the utility model, comprises a transmitter and a receiver.
Described transmitter comprises high frequency signal generator, impedance matching network, source coil and transmitting coil, the high-frequency signal of described high frequency signal generator output rated power.
Described source coil one side is connected to high frequency signal generator by impedance matching network, and opposite side and described transmitting coil utilize electromagnetic induction to form a step-up transformer network.
Described impedance matching network is passive matching network, electric capacity and inductance, consists of; Or active matching network, by the source follower active, passive device forms, emitter follower and buffer, formed.
Described receiver comprises receiving coil and loading coil, and described receiving coil and loading coil utilize electromagnetic induction to form a step-down transformer network.
Equal-sized matching capacitance in one of described loading coil series connection and impedance matching network, and directly connect AC load equipment, or supply with DC load equipment or circuit by a rectification circuit; Described rectification circuit comprises halfwave rectifier, full-wave rectification and bridge rectifier.
Described transmitting coil and receiving coil utilize himself equivalent resistance, parasitic capacitance and self inductance composition resonant circuit under high frequency, and transmitting coil and receiving coil have identical resonance frequency.
The spacing of described source coil and transmitting coil keeps equating with the spacing of receiving coil and loading coil all the time, the electrical quantity of source coil and loading coil is identical, transmitting coil and receiving coil also have identical electrical quantity, and the inductance of coil, high frequency parasitic capacitance, equivalent resistance and internal Q are all identical.
Described transmitting coil obtains from source coil the high-frequency oscillation signal that high frequency signal generator is sent by electromagnetic induction, form with non-radiative near field electromagnetic ripple sends again, described receiving coil receives by the magnetic coupling resonance between coil the high-frequency oscillation signal that transmitting coil transmits, then passes through electromagnetic induction by Power supply loading coil.
All coils is by copper wire winding, be aligned in coaxial direction, the spacing of source coil and transmitting coil, transmitting coil and receiving coil spacing, the spacing of receiving coil and loading coil is adjustable, along with transmitting coil and receiving coil spacing, it is the variation of transmission range, when described system departs from Critical Coupling state, regulate the coupling coefficient of transmitter and receiver simultaneously, be the spacing that simultaneously regulates source coil and transmitting coil, the spacing of receiving coil and loading coil, and keep two spacing to equate, thereby change their coupling coefficient, system meets Critical Coupling condition, be operated in Critical Coupling state.
In change coupling coefficient magnetic resonance radio energy transmission system described in the utility model, between non-conterminous coil, there is no magnetic coupling, in described system, source coil and loading coil are all single-turn circular coils, and transmitting coil and receiving coil are the multiturn coils that has the identical number of turn.
Described change coupling coefficient magnetic resonance radio energy transmission system comprises that extrinsic motivated source high frequency signal generator, impedance matching network, source coil, transmitting coil and receiving coil, loading coil and load equipment form.
The beneficial effects of the utility model are:
1. the utility model can make magnetic coupling resonance radio energy transmission system always work in Critical Coupling state, guarantees that the efficiency of transmission of described system obtains maximum all the time, transmission range reaches optimum.
2. compared with prior art, described system always works in Critical Coupling state, and efficiency of transmission and transmission range are all significantly improved, and has further solved the problem that system efficiency of transmission is restricted by transmission range, has improved the utilization ratio of electric energy.
Accompanying drawing explanation
Fig. 1 is the system schematic of change coupling coefficient magnetic resonance wireless power transmission of the present utility model;
Fig. 2 is the equivalent-circuit model figure of change coupling coefficient magnetic resonance radio energy transmission system of the present utility model;
Fig. 3 is change coupling coefficient magnetic resonance radio energy transmission system example pictorial diagram of the present utility model;
Fig. 4 is the efficiency of transmission comparison diagram of change coupling coefficient magnetic resonance radio energy transmission system of the present utility model and prior art;
Embodiment
In order to make content and the advantage of technical solutions of the utility model more cheer and bright, below in conjunction with accompanying drawing, change coupling coefficient magnetic resonance radio energy transmission system of the present utility model is described in further detail.Should be emphasized that, following explanation is only exemplary, rather than in order to limit scope of the present utility model and application thereof.
Below in conjunction with accompanying drawing, describe the implementation procedure of change coupling coefficient magnetic resonance radio energy transmission system of the present utility model in detail.
Fig. 1 is the system schematic of change coupling coefficient magnetic resonance wireless power transmission of the present utility model.
As shown in Figure 1, change coupling coefficient magnetic resonance radio energy transmission system of the present invention comprises high frequency signal generator, impedance matching network, source coil, transmitting coil, receiving coil, loading coil and load equipment.
High frequency signal generator is sent high-frequency signal pulse, through impedance matching network, energy signal is passed to source coil, the energy transmitting coil of described system utilizes electromagnetic induction to obtain from source coil the high-frequency oscillation signal that high frequency signal generator is sent, then sends out with the form of non-radiative near field electromagnetic ripple.The energy receiving coil of described system receives by the magnetic coupling resonance between coil the high-frequency oscillation signal that transmitting coil transmits, again by electromagnetic induction by Power supply loading coil and load equipment, source coil and loading coil are all single-turn circular coils, transmitting coil and receiving coil are the multiturn coils that has the identical number of turn, the transmission range that the distance of transmitting coil and receiving coil is described system.
All coils is by copper wire winding, be aligned in coaxial direction, along with transmission range is ascending, increase gradually, the maximum of points of system through-put power is merged into 1 gradually by 2, be that working state of system is by being strongly coupled to Critical Coupling, then to the change procedure of weak coupling.
Fig. 2 is the equivalent-circuit model figure of change coupling coefficient magnetic resonance radio energy transmission system of the present utility model.
As shown in Figure 2, the equivalent-circuit model of magnetic coupling resonance radio energy transmission system of the present utility model has four wire loops: source coil loop, transmitting coil loop, receiving coil loop, loading coil loop, L
1, L
2, L
3, L
4be respectively the inductance of source coil, transmitting coil, receiving coil and loading coil, R
e1, R
e2, R
e3, R
e4be respectively source coil, transmitting coil, receiving coil and the loading coil equivalent resistance under high frequency, C
p1the parasitic capacitance of source coil under high frequency and the matching capacitance sum in impedance matching network, C
p2, C
p3respectively transmitting coil and the receiving coil parasitic capacitance under high frequency, C
p4the parasitic capacitance of loading coil under high frequency and the matching capacitance sum of series connection with it, V
sthe output voltage of high frequency signal generator, V
lload voltage, R
s, R
lrespectively internal resistance and the load resistance of high frequency signal generator; k
12the coupling coefficient between source coil and transmitting coil, k
23the coupling coefficient between transmitting coil and receiving coil, k
34it is the coupling coefficient between receiving coil and loading coil.
Equivalent-circuit model analytical procedure to magnetic coupling resonance wireless power transmission of the present utility model is as follows:
1. the equivalent electric circuit of pair described system is analyzed, and obtains equation as described below:
V
sthe output voltage of high frequency signal generator, Z
iifor impedance loop, Z
ijcoupling impedance between adjacent loop, I
iloop current, i, j=1,2,3,4, difference corresponding source coil loop, transmitting coil loop, receiving coil loop, loading coil loop.
2. in pair described step 1, determinant solves I
1, I
4, can obtain the input and output voltage ratio of system
as described below:
3. impedance matching, i.e. input impedance Z
in=R
stime, signal source has peak power output, and the efficiency of transmission η expression formula of system is as follows:
4. described in, in system, the quality factor of each coil are all the known quantities that can indirectly measure:
W wherein
0the angular frequency of extrinsic motivated source signal that high frequency signal generator produces, Q
4the quality factor of loading coil, thus in described step 3 η to k
23when differentiate can obtain system and obtains maximum transmitted efficiency, k
23and k
12satisfied Critical Coupling conditional equality:
the point of obtaining maximum transmitted efficiency because of system is at Critical Coupling place, therefore above formula is system works when Critical Coupling state, coupling coefficient k
23and k
12required satisfied Critical Coupling conditional equality.
Fig. 3 is change coupling coefficient magnetic resonance radio energy transmission system example pictorial diagram of the present utility model.
As shown in Figure 3, the present embodiment is that operating frequency is at f
0the magnetic coupling resonance radio energy transmission system Critical Coupling implementation of=7.65MHz, high frequency signal generator internal resistance and load resistance are 50 ohm, and the copper conductor coiling that all coils is is all 1mm by section radius forms, and is aligned in coaxial direction.Source coil diameter is 28cm, be connected with the high frequency signal generator that impedance matching network and power output are 5W, the diameter of transmitting coil and receiving coil is 60cm, for obtaining high quality factor Q, the selfcapacity of coil and inductance are for resonance, and loading coil diameter is 28cm, are connected with size and are the load resistance of 50 ohm, thereafter be connected with oscilloscope (for the energy of measuring-signal), concrete coil parameter is as shown in table 1.
Table 1
Fig. 4 is the efficiency of transmission comparison diagram of change coupling coefficient magnetic resonance radio energy transmission system of the present utility model and prior art.
The spacing d of source coil and transmitting coil in existing radio energy transmission system (fixed coupling)
12, receiving coil and loading coil spacing d
34all fix, in the present embodiment, be all made as 1cm, transmission range d
23from 10cm, change to 100cm, step-length is 5cm.
Keep said system structure constant, along with the increase of transmission range, coupling coefficient sharply declines, and whole system is in weak-coupling state, the efficiency of transmission of system with the situation of change of transmission range as shown in dashed curve in Fig. 4.
A kind of change coupling coefficient magnetic resonance radio energy transmission system that employing the utility model proposes:
Steps A: determine that the wireless energy transfer of described change coupling coefficient magnetic resonance radio energy transmission system is apart from d
23, i.e. the spacing of transmitting coil and receiving coil;
Step B: according to wireless energy transfer described in steps A apart from d
23, utilize formula
with
calculate the coupling coefficient k of described system transmitting coil and receiving coil
23; Wherein, M
23the coefficient of mutual inductance of transmitting coil and receiving coil, L
2, L
3for the inductance of transmitting coil and receiving coil, be the known quantity that can directly measure by instrument, u
0for permeability of vacuum, u
0=4 π * 10
-7henry/rice, N
2, N
3for the number of turn of transmitting coil and receiving coil, O
2, O
3the wire loop of transmitting coil and receiving coil, O
2, O
3with N
2, N
3be known quantity, dl
2, dl
3respectively an infinitesimal on transmitting coil and receiving coil, d
23it is the spacing of transmitting coil and receiving coil;
Step C: utilize formula
calculating when Critical Coupling state, the coupling coefficient k of described system source coil and transmitting coil
12; Wherein, k
12the coupling coefficient between source coil and transmitting coil, k
23the coupling coefficient between transmitting coil and receiving coil, Q
1, Q
2being respectively the quality factor of source coil and transmitting coil, is the known quantity that can indirectly measure by instrument;
wherein, w
0the angular frequency of extrinsic motivated source signal that high frequency signal generator produces, L
1the inductance value of source coil, R
e1the equivalent resistance of source coil under high frequency, R
sit is the internal resistance of extrinsic motivated source high frequency signal generator;
wherein, w
0the angular frequency of signal that high frequency signal generator produces, L
2the inductance value of transmitting coil, R
e2the equivalent resistance of transmitting coil under high frequency;
Step D: the coupling coefficient of described system source coil and transmitting coil is adjusted to k
12.
According to step described above, step D specifically comprises the following steps:
Step 1: according to calculating gained coupling coefficient k
12, utilize formula
with
calculate the spacing d of source coil and transmitting coil
12; Wherein, M
12the coefficient of mutual inductance of source coil and transmitting coil, L
1, L
2for the inductance of source coil and transmitting coil, be the known quantity that can directly measure by instrument, u
0for permeability of vacuum, u
0=4 π * 10
-7henry/rice, N
1, N
2for the number of turn of source coil and transmitting coil, O
1, O
2the wire loop of source coil and transmitting coil, O
1, O
2with N
1, N
2be known quantity, dl
1, dl
2respectively an infinitesimal on source coil and transmitting coil, d
12it is the spacing of source coil and transmitting coil;
Step 2: regulate the spacing of source coil and transmitting coil to d
12, so far the coupling coefficient of source coil and transmitting coil is adjusted to k
12;
Step 3: the spacing d that regulates receiving coil and loading coil
34to and d
12equate, described system works, at Critical Coupling state, has maximum efficiency of transmission and optimum transmission range, and experimental result is as shown in Fig. 4 block curve.
As shown in Figure 4, under the same conditions, the change coupling coefficient magnetic resonance radio energy transmission system the utility model proposes has significantly improved the efficiency of transmission of system, and when transmission range is respectively 80cm and 100cm, efficiency of transmission effectively improves approximately 30% and 20% respectively.
The foregoing is only preferably execution mode of the utility model; but protection range of the present utility model is not limited to this; in every case in the technical scope that those of ordinary skill in the art disclose at the utility model; the equivalence of doing is modified or conversion, within all should being encompassed in protection range of the present utility model.
Claims (11)
1. become a coupling coefficient magnetic resonance radio energy transmission system, it is characterized in that, comprise a transmitter and a receiver;
Described transmitter comprises high frequency signal generator, impedance matching network, source coil and transmitting coil, the high-frequency signal of described high frequency signal generator output rated power;
Described source coil one side is connected to high frequency signal generator by impedance matching network, and opposite side and described transmitting coil utilize electromagnetic induction to form a step-up transformer network;
Described receiver comprises receiving coil and loading coil, and described receiving coil and loading coil utilize electromagnetic induction to form a step-down transformer network.
2. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 1, is characterized in that, described impedance matching network is passive matching network, electric capacity and inductance, consists of.
3. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 1, is characterized in that, described impedance matching network is active matching network, the source follower active, passive device forms, emitter follower and buffer, consists of.
4. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 1, is characterized in that, equal-sized matching capacitance in one of described loading coil series connection and impedance matching network, and directly connect AC load equipment.
5. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 1, described loading coil is supplied with DC load equipment or circuit by a rectification circuit; Described rectification circuit comprises halfwave rectifier, full-wave rectification and bridge rectifier.
6. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 1, it is characterized in that, described transmitting coil and receiving coil utilize himself equivalent resistance, parasitic capacitance and self inductance composition resonant circuit under high frequency, and transmitting coil and receiving coil have identical resonance frequency;
The spacing of described source coil and transmitting coil keeps equating with the spacing of receiving coil and loading coil all the time, and the electrical quantity of source coil and loading coil is identical, and transmitting coil and receiving coil also have identical electrical quantity.
7. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 6, is characterized in that, described electrical quantity comprises inductance, high frequency parasitic capacitance, equivalent resistance and the internal Q of coil.
8. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 6, it is characterized in that, all coils is by copper wire winding, be aligned in coaxial direction, the spacing of the spacing of source coil and transmitting coil, transmitting coil and receiving coil spacing, receiving coil and loading coil is adjustable;
Described transmitting coil obtains from source coil the high-frequency oscillation signal that high frequency signal generator is sent by electromagnetic induction, form with non-radiative near field electromagnetic ripple sends again, described receiving coil receives by the magnetic coupling resonance between coil the high-frequency oscillation signal that transmitting coil transmits, then passes through electromagnetic induction by Power supply loading coil.
9. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 8, it is characterized in that, along with transmitting coil and receiving coil spacing, it is the variation of transmission range, when described system departs from Critical Coupling state, regulate the coupling coefficient of transmitter and receiver simultaneously, thereby change their coupling coefficient, system meets Critical Coupling condition, is operated in Critical Coupling state.
10. a kind of change coupling coefficient magnetic resonance radio energy transmission system according to claim 9, is characterized in that, the adjusting of described coupling coefficient is by regulate the spacing d of source coil and transmitting coil simultaneously
12, receiving coil and loading coil spacing d
34realize, and keep two spacing to equate, be i.e. d
12=d
34.
11. a kind of change coupling coefficient magnetic resonance radio energy transmission systems according to claim 9, it is characterized in that, in described system, between non-conterminous coil, there is no magnetic coupling, in described system, source coil and loading coil are all single-turn circular coils, and transmitting coil and receiving coil are the multiturn coils that has the identical number of turn.
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| CN201320552307.3U CN203537076U (en) | 2013-09-06 | 2013-09-06 | Variable-coupling coefficient magnetic resonance wireless power transmission system |
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| CN201320552307.3U CN203537076U (en) | 2013-09-06 | 2013-09-06 | Variable-coupling coefficient magnetic resonance wireless power transmission system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414261A (en) * | 2013-09-06 | 2013-11-27 | 中国矿业大学(北京) | Variable-coupling coefficient magnetic resonance wireless power transmission system and method |
| CN106487105A (en) * | 2016-11-14 | 2017-03-08 | 太原理工大学 | A kind of magnet coupled resonant type wireless power transfer of modified line coil structures |
| CN106981933A (en) * | 2017-04-25 | 2017-07-25 | 东北大学 | Radio energy transmission system and based on apart from adaptive driving coil collocation method |
-
2013
- 2013-09-06 CN CN201320552307.3U patent/CN203537076U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414261A (en) * | 2013-09-06 | 2013-11-27 | 中国矿业大学(北京) | Variable-coupling coefficient magnetic resonance wireless power transmission system and method |
| CN106487105A (en) * | 2016-11-14 | 2017-03-08 | 太原理工大学 | A kind of magnet coupled resonant type wireless power transfer of modified line coil structures |
| CN106487105B (en) * | 2016-11-14 | 2019-03-19 | 太原理工大学 | A kind of magnet coupled resonant type wireless power transfer of modified line coil structures |
| CN106981933A (en) * | 2017-04-25 | 2017-07-25 | 东北大学 | Radio energy transmission system and based on apart from adaptive driving coil collocation method |
| CN106981933B (en) * | 2017-04-25 | 2024-02-06 | 东北大学 | Wireless power transmission system and driving coil configuration method based on distance self-adaption |
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|---|---|---|---|
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Granted publication date: 20140409 Termination date: 20140906 |
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