CN108900013A - Wireless energy transmission equipment - Google Patents

Wireless energy transmission equipment Download PDF

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Publication number
CN108900013A
CN108900013A CN201810993845.3A CN201810993845A CN108900013A CN 108900013 A CN108900013 A CN 108900013A CN 201810993845 A CN201810993845 A CN 201810993845A CN 108900013 A CN108900013 A CN 108900013A
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CN
China
Prior art keywords
coil
wireless energy
energy transmission
transmission
source
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201810993845.3A
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Chinese (zh)
Inventor
张跃进
曾庆生
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Zhongxiang Bo Qian Mdt Infotech Ltd
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Zhongxiang Bo Qian Mdt Infotech Ltd
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Publication date
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Priority to CN201810993845.3A priority Critical patent/CN108900013A/en
Publication of CN108900013A publication Critical patent/CN108900013A/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

Abstract

The present invention relates to a kind of wireless energy transmission equipments, including transmitter and receiver, transmitter includes source coil and transmitting coil, receiver includes loading coil and receiving coil, source coil and transmitting coil are on same dielectric-slab, loading coil and receiving coil can be realized the wireless transmission of energy on same dielectric-slab, improve the utilization rate of energy.

Description

Wireless energy transmission equipment
Technical field
The present invention relates to radio transmission technical fields, and in particular to a kind of wireless energy transmission equipment.
Background technique
As the improvement of people's living standards, electricity, which just like has changed into people's life, is difficult to the thing lacked.And power supply There is no the technology of electrical connection to be referred to as wireless energy transmission technology between electric appliance, technique provides a lot for people It is convenient, also give people's more safety.But current wireless energy transmission technology energy transmission efficiency is lower, causes energy The waste of amount.
Summary of the invention
In view of this, the present invention provides a kind of wireless energy transmission equipment, wireless energy transmission technology energy transmission is solved The lower problem of efficiency.
In order to achieve the above object, the present invention adopts the following technical scheme that:
A kind of wireless energy transmission equipment, including transmitter and receiver, the transmitter include source coil and emission lines Circle, the receiver includes loading coil and receiving coil;
The source coil is coupled with the transmitting coil, and the loading coil is coupled with the receiving coil, the transmitting Coil is coupled with the receiving coil;
The source coil and the transmitting coil are arranged on same dielectric-slab, the loading coil and the reception line Circle is arranged on same dielectric-slab.
Further, the source coil and the transmitting coil are in arranged concentric, including the source coil, the emission lines Circle is outside;
The loading coil and the receiving coil are in arranged concentric, and including the loading coil, the receiving coil exists Outside.
Further, have on the source coil, transmitting coil, load coil and receiving coil for syntonizing coil resonance frequency Capacitor.
Further, the capacitor is 60pF.
Further, there is electromagnetic material between the transmitting coil and the receiving coil.
Further, the source coil is 1 circle, and the source coil radius is 30mm.
Further, the transmitting coil is 3 circles, and the transmitting coil spacing width is 5mm.
Further, the loading coil is 1 circle, and the loading coil radius is 30mm.
Further, the receiving coil is 3 circles, and the receiving coil spacing width is 5mm.
Further, the coil width is 1.5mm.
The invention adopts the above technical scheme, the wireless energy transmission equipment, by electromagnetic coupling resonance by source coil Energy transmission to transmitting coil, transmitting coil transfers energy to receiving coil by electromagnetic coupling resonance, and receiving coil is again Loading coil is transferred energy to, the final wireless transmission for realizing energy improves the utilization rate of energy.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is the structure chart of wireless energy transmission equipment of the invention.
Fig. 2 is the resonance frequency measuring circuit figure of wireless energy transmission equipment coil of the invention.
Fig. 3 is the equivalent circuit diagram of wireless energy transmission equipment of the present invention.
Fig. 4 is the front view of the transmitter of wireless energy transmission equipment of the present invention.
Fig. 5 is a kind of HFSS analogous diagram of embodiment of wireless energy transmission equipment of the present invention.
Fig. 6 a is HFSS analogous diagram of the wireless energy transmission equipment of the present invention when measuring distance is 150mm;
The HFSS analogous diagram that Fig. 6 b is measuring distance when being 50mm.
Fig. 7 is the graph of relation of wireless energy transmission equipment transmission range and efficiency of transmission of the invention.
Fig. 8 is the simple equivalent circuit figure of wireless energy transmission equipment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work Other embodiment belongs to the range that the present invention is protected.
Fig. 1 is the structure chart of wireless energy transmission equipment of the invention.As shown in Figure 1, the wireless energy of the present embodiment passes Transfer device, including transmitter 11 and receiver 12, transmitter 11 include source coil 111 and transmitting coil 112, and receiver 12 includes Loading coil 121 and receiving coil 122;Source coil 111 is coupled with transmitting coil 112, loading coil 121 and receiving coil 122 Coupling, transmitting coil 112 are coupled with receiving coil 122;Source coil 111 and transmitting coil 112 are arranged in same dielectric-slab 113 On, loading coil 121 and receiving coil 122 are arranged on same dielectric-slab 123.
Have on source coil 111, transmitting coil 112, loading coil 121 and receiving coil 122 for syntonizing coil resonance frequency The capacitor of rate.
Specifically, up to the present, wireless energy transfer is divided into three classes:Electromagnetic wave wireless energy transmission technology, Induction type wireless energy transmission technology, magnetic coupling harmonic technology.
Electromagnetic wave wireless energy transmission technology is exactly first to be emitted with antenna and then received again in the form of microwave or laser Process.Efficiency of transmission is not very high to electromagnetic beam in space, but also cannot have the presence of barrier, emits and connects Receipts machine is also required to be aligned, and causes its direction that cannot arbitrarily adjust, it is advantageous that longer-distance wireless energy can be realized Transmission.And its be not only lost it is big and also to animal there are also certain side effect, technique is in satellite solar power station, military The special occasion such as satellite has more utilizations;Induction type wireless energy transmission technology its substantially be exactly that electromagnetism sense is utilized The principle answered, i.e., the energy between two adjacent coils can be transmitted by magnetic field, the non-contact energy transmission of electromagnetic induction The characteristics of technology, is short range transmissions, and two side positions of the separable transformer of application are relatively fixed;Magnetic coupling harmonic technology is With the near-field coupling in magnetic field to realize wireless energy transfer, even if transmission range can also reach in the case of having some obstacles To meter level.Technique has merged the technical some advantages of the first two, all than their phases in efficiency of transmission and transmission range It is corresponding to increase.And the health of the mankind can't be affected in the environment of high-intensity magnetic field.Preferably, the present embodiment selects With the mode of magnet coupled resonant type wireless energy transmission.
Specifically, the wireless energy transmission equipment of the present embodiment is needed in view of the self-condition of load and to power supply Requirement.In addition to this, it also needs to consider the influence to ambient enviroment.For example, while requirement of the concern load to transmission frequency, It must also be ensured that the frequency range cannot be to biological harmful and upset other equipment communication.If transmission frequency is any in 0~25MHz Variation, when load matched, coil inductance, capacitor, dead resistance etc. change with the variation of frequency, thus further Influence the variation of efficiency of transmission.
Source coil 111 shows the big of the voltage, electric current for carrying coil 121 that be negative by magnetic field coupling to 121 ability of loading coil It is small.The coefficient of coup is the quantization of coupling ability parameter.It can be according to transimission power so that it is determined that the coefficient of coup and source coil 111 Voltage and current.In the higher frequency range of efficiency of transmission, the voltage of source coil 111 is high, so the also phase of the requirement to circuit prototype part That answers is higher.So needing to comprehensively consider voltage and efficiency of transmission to select transmission frequency.Transmitting electric current also can be with frequency Variation and change, when transimission power is larger will consider coil current-carrying capability.
Specifically, the basic structure of the wireless energy transmission equipment of the present embodiment is by source coil 111, transmitting coil 112, negative 122 4 coil 121, receiving coil coils compositions are carried, and the Q value of coil and resonance frequency directly influence the energy of whole system Measure efficiency of transmission and distance.So important for the measurement of four coil resonance frequencies.Basic resonance circuit deposits series connection The measurement method of resonance circuit and two kinds of antiresonant circuit, basic circuit structure and resonance frequency is also different.According to line The physical structure of circle, it is preferable that the parallel resonance model that the present embodiment uses carrys out the resonance frequency of measuring coil.
Fig. 2 is the resonance frequency measuring circuit schematic diagram of wireless energy transmission equipment coil of the invention.As shown in Fig. 2, In view of the influence of parasitic capacitance in coil, a LC resonance ring can be formed in coil both ends shunt capacitance C.
The total impedance of circuit is in figure:
Wherein, the total impedance in Z indication circuit, R indicate that resistance, ω indicate that the angular frequency of AC power source, L indicate inductance, C For the shunt capacitance at coil both ends, C1For the compensating electric capacity of energy transmit coil, j is the imaginary part of symbol in plural number.
The ratio of resistance R both end voltage and source voltage isWhenWhen, impedance Z reaches maximum Value is intended to infinity, and resistance R both end voltage reaches minimum value and is intended to zero at this time.
By analyze above it is recognised that due to parasitic capacitance presence, cannot be simply by the capacitor being calculated Directly and coil directly obtains the frequency of needs, therefore can be finely adjusted to the capacitance being calculated.If will calculate Obtain capacitance and be incorporated to circuit, the resonance frequency of obtained coil can than expected frequency it is low.
Fig. 3 is the equivalent circuit diagram of wireless energy transmission equipment of the present invention.As shown in figure 3, C1、C2、C3、C4It respectively indicates The equivalent capacity of source coil 111, transmitting coil 112, receiving coil 122, loading coil 121, Rp1、Rp2、Rp3、Rp4It respectively indicates Source coil 111, transmitting coil 112, receiving coil 122, loading coil 121 equivalent resistance, L1、L2、L3、L4Respectively indicate source The equivalent inductance of coil 111, transmitting coil 112, receiving coil 122, loading coil 121, RsourceFor signal source, RloadIt is negative Carry resistance, two-by-two between magnetic coupling coefficient distinguish k12, k23, k34.One typical realizes is by source coil 111 and transmitting coil 112 Establish such k on a simple device12It will be fixed and invariable.It is similar, k34It will also be fixed.Therefore, k23It is not Controlled value, he changes as the distance between transmitter and receiver changes.
The KVL equation group of this circuit is:
Wherein, I1、I2、I3、I4Respectively indicate source coil 111, transmitting coil 112, receiving coil 122, loading coil 121 Electric current, M12For the mutual inductance between source coil 111 and transmitting coil 112, M23Between transmitting coil 112 and receiving coil 122 Mutual inductance, M34Mutual inductance between receiving coil 122 and loading coil 121.
Equation (2) to (5) is solved and obtains load voltage V after comingLoadWith source voltage VSourceRatio:
Wherein
So as to calculate S21
After calculating S21, the efficiency eta of transmission can be calculated:
Resonance frequency to the inductance of coil and capacitor be it is relevant, restrict the selection of resonance frequency, institute there are many factor Can choose the capacitor to match with them after determining the inductance of resonance frequency and coil.
Can width to winding wire, the radius of interior loop, capacitor size carry out rough estimation.It then can benefit With the optimization function of HFSS software, the above parameter is determined.
Fig. 4 is the front view of the transmitter of wireless energy transmission equipment of the present invention.As shown in figure 4, the series connection of the present embodiment Capacitor can choose 60pF, and source coil 111 can choose 1 circle, 111 diameter d of source coil3It can choose 60mm, transmitting coil 112 It can choose 3 circles, 112 spacing width d of transmitting coil2It can choose 5mm;Coil width d1It can choose 1.5mm.With transmitter Identical, the loading coil 121 of receiver can choose 1 circle, and 121 diameter of loading coil can choose 60mm, and receiving coil 122 can To select 3 circles, 122 spacing width of receiving coil can choose 5mm.It can be added between transmitting coil 112 and receiving coil 122 One or more layers electromagnetic material, since increase wireless energy transfer distance.Electromagnetic material can amplify electromagnetic wave, it is possible to make The decay distance of electromagnetic wave extends.
Fig. 5 is a kind of HFSS analogous diagram of embodiment of wireless energy transmission equipment of the present invention.As shown in figure 5, at this time humorous Vibration frequency is 13.8MHz, S21For -1.9997db, the efficiency of this time simulation result transmission is 63%.
The wireless energy transfer system of moderate distance, coil radius and transmission range are the same orders of magnitude.Winding wire Line footpath is the establishment that the order of magnitude of millimeter needs to guarantee close coupling relationship, and the size of resonance frequency can be 106Hz or so.Separately Outside, it is medium that magnetic coupling wireless energy transfer system, which is with time-varying magnetic field, not to for radiated electromagnetic energy, so needing electromagnetism Wavelength is much larger than transmission range.The approximate range of moderate distance is tens millimeters to several meters, it is preferable that magnetic coupling wireless energy passes The frequency of defeated system is preferable in the range of 0.5~25MHz.The frequency of the present embodiment is located exactly at this section, this frequency Human body or other biological will not be damaged, it will not be together with traditional electronics frequency aliasing.
Can magnetic coupling wireless energy transfer system be applied in real life, one of them critically important factor is exactly Its efficiency of transmission whether can reach it is intended that as, loss, environment if efficiency of transmission is not high enough, from the energy There are also from the point of view of the convenience degree to people's life, that people may seldom will use this technology for protection.And according to life Common sense in work it is found that the cause for influencing magnetic coupling transmission system be known as apart from, there are also sizes of dielectric-slab etc. for angle:
Influence of the transmission range to efficiency:It can change transmission range, observe the variation of efficiency of transmission.In addition to distance is It can be 150mm, 120mm, 50mm with measuring distance except 100mm, the case where when 20mm.Fig. 6 a is that wireless energy of the present invention passes HFSS analogous diagram of the transfer device when measuring distance is 150mm.As shown in Figure 6 a, when transmission range being changed to 150mm, S21At when be -5.71db, according to formula (7), efficiency of transmission at this time is 27%.There is biggish decaying than before.
The HFSS analogous diagram that Fig. 6 b is measuring distance when being 50mm.As shown in Figure 6 b, transmission range at this time is 50mm, S21At when be -1.6db, also according to formula (7), it is known that efficiency of transmission is 69%, efficiency increases.
According to same method, can will other it is several apart from when efficiency of transmission calculate in the same way, Obtain the result such as table 1:
The relationship of table 1 transmission range and efficiency of transmission
Transmission range 20mm 50mm 100mm 120mm 150mm
Efficiency of transmission 76% 69% 63% 51% 27%
Fig. 7 is the graph of relation of wireless energy transmission equipment transmission range and efficiency of transmission of the invention.Such as Fig. 7 institute Show, it can be seen that with the increase of transmission range, efficiency of transmission is gradually decreased.This also complies with the understanding in life, i.e. distance is got over If small, signal is better, and the efficiency of transmission is naturally also higher.
Frequency splitting phenomenon:As shown in Figure 6 b, there are two peak values in insertion loss when transmission range is 50mm, The phenomenon that producing frequency splitting.When system modelling, for simplified analysis, it can generally ignore coil and coil Cross-coupling only considers the direct-coupling effect for closing on coil.At the same time, since driving coil and receiving coil the number of turns compare Few, there is no the equivalent resistances for considering two wire loops.
Fig. 8 is the simple equivalent circuit figure of wireless energy transmission equipment of the present invention.As shown in figure 8, source coil 111 and load The self-induction of coil 121 is respectively L1、L4.Transmitting coil 112 and 122 loop parameter of receiving coil are respectively L2, R2, L3, R3, RLIt is System equivalent load, 111 voltage of source coil are V1, M12, M23, M34The respectively mutual inductance between two adjacent windings from left to right.Hair Ray circle 112 is symmetrical with parameter of the receiving coil 122 in wireless energy transfer system, that is to say, that the ginseng of symmetric position Numerical values recited is equal.
Electric parameter in transmitting coil 112 and receiving coil 122 is mapped in intermediate resonance coil circuit first, with drop Low mathematical analysis difficulty.The case where mapping, is as follows:
The expression formula of each parameter is all brought into and available system resonance Frequency Response and M after abbreviation23Relationship.
Above-mentioned formula shows that the relationship of system resonance frequencies and M23 are very close, andk23For send and The coefficient of coup between receiving coil 122, if coil parameter is certain, its value is determined by the distance between coil.It can be with The increase of distance and reduce.WhenWhen, i.e. M23When sufficiently large, only one resonant frequency point of system:
In this case, in this case the nearly all magnetic lines of force of transmitting coil 112 are coupled by receiving coil 122 It will be very close.But such situation is very few to the magnetic coupling resonator system application of those big Distance Transmissions, transmitting Coil 112 and 122 hollow nature of receiving coil equally illustrate that such case is generally difficult to appear in engineering.In terms of other From the point of view of, desirable in real life is that the remoter the distance between transmitting coil 112 and receiving coil 122 the better.So Its theoretical research be largely focused on transmitting coil 112 and receiving coil 122 it is remote enough under conditions of transmission characteristic is ground Study carefully.
With the increase of transmitting coil 112 and 122 distance of receiving coil, their degree of coupling weakens, whenWhen, there are two resonant frequency points for system, i.e.,:
Influence of the angle to efficiency of transmission:When application in real life, between general transmitting and receiving device simultaneously It does not face, often will form certain angle between them, and hence it is also possible to study transmitting coil 112 and receive line Circle 122 is in different angle the case where efficiency of transmission.Simulation result shows, S21 is that -2.17db its efficiency of transmission is 60.7%, 0.17db is had dropped when compared with angle being 0 °.Next can also test when angle is respectively 5 °, 40 °, 60 ° without The efficiency of transmission of heat input Transmission system, as shown in table 2.Data are shown in angle when be 5 °, and efficiency of transmission reduces very Few, when angle is 20 °, efficiency of transmission has still reached 60% or more.
The relationship of table 2 coil angle and efficiency of transmission
Coil angle 20° 40° 60°
Efficiency of transmission 62.8% 60.7% 56% 46.5%
Using above technical scheme, the wireless energy transmission equipment, by electromagnetic coupling resonance by the energy of source coil 111 Amount passes to transmitting coil 112, and transmitting coil 112 transfers energy to receiving coil 122 by electromagnetic coupling resonance, receives line Circle 122 transfers energy to loading coil 121 again, and the final wireless transmission for realizing energy improves the utilization rate of energy.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments Unspecified content may refer to the same or similar content in other embodiments.
It should be noted that in the description of the present invention, term " first ", " second " etc. are used for description purposes only, without It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple " Refer at least two.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, modifies, replacement and variant.

Claims (10)

1. a kind of wireless energy transmission equipment, which is characterized in that including transmitter and receiver, the transmitter includes source coil And transmitting coil, the receiver include loading coil and receiving coil;
The source coil is coupled with the transmitting coil, and the loading coil is coupled with the receiving coil, the transmitting coil It is coupled with the receiving coil;
The source coil and the transmitting coil are arranged on same dielectric-slab, and the loading coil is set with the receiving coil It sets on same dielectric-slab.
2. wireless energy transmission equipment according to claim 1, which is characterized in that
The source coil and the transmitting coil are in arranged concentric, and including the source coil, the transmitting coil is outside;
The loading coil and the receiving coil are in arranged concentric, and including the loading coil, the receiving coil is outside.
3. wireless energy transmission equipment according to claim 1, which is characterized in that the source coil, carries coil at transmitting coil And have the capacitor for syntonizing coil resonance frequency on receiving coil.
4. wireless energy transmission equipment according to claim 3, which is characterized in that the capacitor is 60pF.
5. wireless energy transmission equipment according to claim 1, which is characterized in that the transmitting coil and the receiving coil Between have electromagnetic material.
6. wireless energy transmission equipment according to claim 1, which is characterized in that the source coil is 1 circle, the source coil Radius is 30mm.
7. wireless energy transmission equipment according to claim 1, which is characterized in that the transmitting coil is 3 circles, the transmitting Coil-span width is 5mm.
8. wireless energy transmission equipment according to claim 1, which is characterized in that the loading coil is 1 circle, the load Coil radius is 30mm.
9. wireless energy transmission equipment according to claim 1, which is characterized in that the receiving coil is 3 circles, the reception Coil-span width is 5mm.
10. any one of -9 wireless energy transmission equipment according to claim 1, which is characterized in that the coil width is 1.5mm。
CN201810993845.3A 2018-08-29 2018-08-29 Wireless energy transmission equipment Withdrawn CN108900013A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201810993845.3A CN108900013A (en) 2018-08-29 2018-08-29 Wireless energy transmission equipment

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110034613A (en) * 2019-04-19 2019-07-19 深圳蔚蓝无限科技有限公司 Satellite power system and satellite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110034613A (en) * 2019-04-19 2019-07-19 深圳蔚蓝无限科技有限公司 Satellite power system and satellite

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Application publication date: 20181127