CN102946156B - Wireless power transmission device - Google Patents
Wireless power transmission device Download PDFInfo
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- CN102946156B CN102946156B CN201210477563.0A CN201210477563A CN102946156B CN 102946156 B CN102946156 B CN 102946156B CN 201210477563 A CN201210477563 A CN 201210477563A CN 102946156 B CN102946156 B CN 102946156B
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Abstract
The invention relates to a wireless power transmission device which is composed of four coils of a transmitting coil (10), a transmitting terminal amplifying coil (20), a receiving terminal amplifying coil (30) and a receiving coil (40) which are parallelly arranged, and the four coils are all in parallel connection with variable resonance compensation capacitors ( C1, C2, C3 and C4). The transmitting coil (10) and the transmitting terminal amplifying coil (20) form a transmitter, and the receiving terminal amplifying coil (30) and the receiving coil (40) form a receiver.
Description
Technical field
The present invention relates to a kind of wireless power transmission apparatus of high-power high-efficiency.
Background technology
Wireless power transmission application prospect is extensive, but existing Contactless power transmission device power is little, and efficiency is low, and transmission range is very near, and be mainly used in electronic equipment charging occasion, this technology is difficult to use in large-power occasions.
Wireless power transmission is applied to as significant in large-power occasions (as charging electric vehicle), is also study hotspot in recent years.But this application scenario requires that wireless power transmission power at least reaches KW level, and the power delivery of this rank necessarily requires very high power transmission efficiency, otherwise not only can produce huge energy loss, and the heat radiation of device is also a very scabrous problem.Existing wireless power transmission scheme cannot meet this large-power occasions.
In November, 2006, assistant professor MarinSoljacic research group of Massachusetts Institute Technology (MIT) department of physics proposed magnetic coupling harmonic technology, and carried out experimental verification in June, 2007, a 60W bulb is lighted every sky by 2.16m of being separated by, and efficiency is 40%.But the power delivery of 60W still can not meet the power demand of large-power occasions KW level far away, and the operating frequency of about the 10MHz mentioned in article brings difficulty also to the design of the high power switching power supply power in Contactless power transmission device.
After magnetic coupling harmonic technology proposes, many wireless power transmission schemes based on this technology are suggested in succession, and their common feature is: in order to improving SNR, by coil working on resonance point.But when coils from parallel connection of coils resonance compensation electric capacity, if coil and shunt capacitance are operated on resonance point, the voltage that it bears will be very high, this will have higher requirement to the insulating capacity of equipment.
Chinese patent application CN 102227860A " non-contact power transmission device and method for designing thereof " adopts the project organization of the Massachusetts Institute of Technology (MIT), second coil and tertiary coil are operated in resonance condition, resonance frequency is 2 ~ 7MHz, this structure is used in powerful occasion and will produces following 3 problems: 1. high-frequency high power switching power supply difficult design like this; 2. the mutual inductance of the first coil and the 4th coil and other coil can cause interference to resonance point; If 3. the second coil and tertiary coil are fully operational on resonance point, the voltage of these two coils and these two coils from parallel connection of coils electric capacity will be very high.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of powerful Contactless power transmission device, to solve the problem that current wireless power transmission technology is difficult to be applied to large-power occasions (as charging electric vehicle).
For solving the problems of the technologies described above, the invention provides a kind of powerful Contactless power transmission device, comprise high frequency electric source, load, transmitting coil, transmitting terminal amplifies coil, receiving terminal amplifies resonance compensation electric capacity in parallel on coil, receiving coil and this four coils.
Transmitting coil and transmitting terminal amplify coil and form emitter, and receiving terminal amplifies coil and receiving coil forms receiving system.
It is identical with receiving coil size that described transmitting coil, transmitting terminal amplify coil, receiving terminal amplifies coil, parallel placement.Four coils be centrally located on same central axis,---transmitting terminal amplifies coil---receiving terminal amplifies coil---receiving coil, or receiving coil---receiving terminal amplifies coil---transmitting terminal amplifies coil---transmitting coil of putting order successively for transmitting coil.
Transmitting coil and transmitting terminal amplify the distance between coil, and the close together between receiving coil and receiving terminal amplification coil, are less than 10mm.The distance that transmitting terminal amplifies between coil and receiving terminal amplification coil is comparatively large, between 100mm to 500mm.
Described transmitting coil, transmitting terminal amplify coil, receiving terminal amplifies coil and these four coils of receiving coil are air core coil, can adopt the regular polygon shape such as circle or square, hexagon, octagon.Coil winding becomes multiturn, also can be coiled into plate-like by coiled.Coil can adopt sub-thread enamelled wire, the coiling of multiply enamelled wire, and enamelled wire material can be copper, silver, silver-coated copper wire etc.
Four equal parallel resonance building-out capacitors of coil, to amplify magnetic field, improve the magnetic Field Coupling degree between coil.The lc circuit that each coil is formed with resonance compensation electric capacity in parallel separately.Described lc circuit not necessarily works in natural resonance point, according to transmitting power and distance, can regulate near resonance point.The natural resonance frequency of transmitting coil and its resonance compensation electric capacity, and the natural resonance frequency of receiving coil and its resonance compensation electric capacity is away from resonance point; Transmitting terminal amplifies the natural resonance frequency of coil and its resonance compensation electric capacity, and receiving terminal amplifies the natural resonance frequency of coil and its resonance compensation electric capacity comparatively near resonance point.
Contactless power transmission device of the present invention can be operated between 20KHz to 500KHz frequency.The maximum voltage value that can allow according to the output impedance of the power of wireless power transmission and transmission range, this device front end series connection high-frequency ac power, the impedance of this device rear end series load, each coil etc., because of Shunt compensation capacitor value, coil turn, the coil dimension of each coil in usually adjustment Contactless power transmission device, make Contactless power transmission device reach best operating point.
During the work of this Contactless power transmission device, the electric energy conversion that the high frequency electric source connected in this device front end by transmitting coil exports is magnetic field energy, and transfer its energy to transmitting terminal amplification coil by magnetic Field Coupling principle, transmitting terminal amplifies coil and utilizes its low-impedance characteristic, magnetic field is amplified and is passed to receiving terminal and amplify coil, receiving terminal amplifies coil and utilizes its low-impedance characteristic, the magnetic field received is amplified further, and passing to receiving coil by magnetic Field Coupling, magnetic field energy is converted into electric energy and exports load to by receiving coil.Transmitting coil and transmitting terminal amplify coil and utilize respective resonance compensation electric capacity, effectively improve mutual degree of coupling, and are that magnetic field energy is launched by electric energy conversion.Receiving terminal amplifies coil and receiving coil utilizes respective resonance compensation electric capacity, and the magnetic field energy effectively received also is converted into electric energy.Transmitting coil, transmitting terminal amplify coil, receiving terminal amplifies coil, receiving coil all serves magnetic field amplification, respective multiplication factor can be adjusted by each parallel resonance building-out capacitor, natural resonance frequency and the supply frequency of parallel resonance building-out capacitor and coil inductance are more close, and the multiplication factor of coil to magnetic field is higher.
Coil multiplication factor improves the increase electric current of coil and the voltage of shunt capacitance, threat is brought to the safety and stability of this Contactless power transmission device work, proposing for this reason under the prerequisite meeting power delivery requirements, by reducing the multiplication factor of each coil, reducing electric current and the voltage of each coil.
Beneficial effect: compared with existing wireless power transmission technology, tool of the present invention has the following advantages
1. operating frequency is low.Similar technique operating frequency is mostly at the even tens of MHZ of several MHZ, and high-frequency high power switching power supply difficult design like this, and the highest design frequency of the present invention is 500KHZ, the Switching Power Supply simplicity of design of this frequency, power output is large, and efficiency is high.
2. the voltage endurance capability of pair each parts and the insulating requirements of equipment reduce.The present invention, from the safety of Contactless power transmission device and the design of stable angle, greatly reduces the magnitude of voltage of Contactless power transmission device each several part, reduces insulation costs.
3. long transmission distance.Transmission range is between 100mm to 500mm.
4. through-put power is large, and efficiency is high.Can transmit the electric energy of number KW, efficiency reaches more than 85%.
Accompanying drawing explanation
Fig. 1 is the structure chart of this device, in figure: 10 transmitting coils, C1 first parallel resonance compensation condenser, 11 high-frequency ac powers, 20 transmitting terminals amplify coil, C2 second parallel resonance compensation condenser, 30 receiving terminals amplify coil, C3 the 3rd parallel resonance compensation condenser, 40 receiving coils, C4 the 4th parallel resonance compensation condenser, 41 loads.
Fig. 2 is the circuit theory diagrams of this device.
Embodiment
As shown in Figure 1, apparatus of the present invention are made up of the coil of 4 band resonance compensation electric capacity, and with air gap coupling between coil, there is high-frequency ac power 11 transmitting coil front end, terminating load 41 after receiving coil.
Transmitting coil 10 and transmitting terminal amplify coil 20 and form emitter, and receiving terminal amplifies coil 30 and forms receiving system with receiving coil 40.
As a kind of embodiment, by transmitting coil 10, transmitting terminal amplifies coil 20,4 coils such as receiving terminal amplification coil 30, receiving coil 40 etc. are all coiled into the spiral coil that diameter is 500mm.Coil is coiled into by multiply enamelled wire, and transmitting coil 10 and the receiving coil 40 coiling number of turn are 2 circles, and it is 5 circles that transmitting terminal amplification coil 20 amplifies the coil 30 coiling number of turn with receiving terminal.The distance that transmitting coil 10 and transmitting terminal amplify between coil 20 is less than 5mm, and equally, the distance that receiving coil 40 and receiving terminal amplify between coil 30 is less than 5mm.Transmitting terminal amplifies coil 20 and the receiving terminal distance of amplifying between coil 30 is 250mm.The parallel placement of coil described in 4, being centrally located on same axis of the coil described in 4.Certainly, this structure is only the size of a kind of example, coil, and shape, the number of turn, distance, material can adjust according to actual conditions difference.
As shown in Figure 2, the high-frequency ac voltage input transmitting coil 10 that civil power is obtained after frequency conversion, the rear terminating load 41 of receiving coil 40.Amplify the second parallel resonance building-out capacitor C2 on coil 20, the 3rd parallel resonance building-out capacitor C3 on receiving terminal amplification coil 30 and the 4th parallel resonance building-out capacitor C4 on receiving coil 40 by regulating the first parallel resonance building-out capacitor C1 on transmitting coil 10, transmitting terminal and find a most suitable working point, make maximum transmission power, efficiency of transmission value, the magnitude of voltage of each coil and electric capacity all can meet design requirement.
In general, the 3rd parallel resonance building-out capacitor C3 on coil 30 is amplified by the second Shunt compensation capacitor C2 and receiving terminal regulating transmitting terminal amplification coil 20, when 20, C2 and 30, the natural resonance frequency of C3 and supply frequency more close to time, the maximum transmission power of apparatus of the present invention and efficiency more can better be showed, but simultaneously these two coils 20, flow through on 30 electric current and the voltage that bears of parallel resonance building-out capacitor C2, C3 will increase.For guaranteed efficiency and maximum transmission power, transmitting terminal amplifies the natural resonance frequency of coil 20 and the second parallel resonance building-out capacitor C2
receiving terminal amplifies the natural resonance frequency of coil 30 and the 3rd parallel resonance building-out capacitor C3
with supply frequency f
0deviation be less than 30%, namely
with
wherein L
2, L
3be respectively transmitting terminal amplify coil 20 and connect the inductance value that receiving terminal amplifies coil 30; C
2, C
3represent the second resonance compensation electric capacity and the 3rd resonance compensation electric capacity respectively; f
0, f
1, f
2represent the frequency of high-frequency ac power 12 output voltage respectively, the natural resonance frequency of transmitting terminal amplification coil 20 and the second parallel resonance building-out capacitor C2 and receiving terminal amplify the natural resonance frequency of coil 30 and the 3rd parallel resonance building-out capacitor C3.
Due to the voltage on necessary limiting coil, the multiplication factor of transmitting terminal amplification coil and receiving terminal amplification coil can not be excessive, the efficiency of this meeting restraint device and maximum transmission power.In this case can be compensated by the multiplication factor increasing transmitting coil and receiving coil.As shown in Figure 2, by regulating the first parallel resonance building-out capacitor C1 of transmitting coil 10 and the 4th parallel resonance building-out capacitor C4 of receiving coil 40, change the multiplication factor of transmitting coil 10 and receiving coil 40, until the efficiency of device and security and stability reach rational scope.
Now amplify coil 20 for transmitting coil 10 and transmitting terminal and illustrate that adjustment four resonance compensation electric capacity are to the effect reducing coils from parallel connection of coils resonance compensation electric capacity withstand voltage.As shown in Figure 2, for ensureing magnetic Field Coupling intensity, launching and amplifying electric current I in coil 10
2.must reach very large value, but the first parallel resonance now in parallel on transmitting coil 10 compensates the voltage of C2 electric capacity
can reach very large, at this moment only have increase C
2u could be reduced
c2value, but must ensure increase C
2shi Buhui reduces I
2, this can be realized by the first parallel resonance building-out capacitor C1 regulated on transmitting coil 10, and reason is as follows:
Due to
Wherein, Z
1=jwL
1,
As high frequency electric source output voltage U1 and (Z
1+ Z '
2) (Z
2+ Z '
1) constant time, I
2remain unchanged.In order to reduce the voltage of C2 electric capacity
can by increasing C
2with adjustment C
1realize.Therefore C is regulated
1and C
2value can amplify when maintaining transmitting terminal the magnitude of voltage reducing transmitting terminal coils from parallel connection of coils electric capacity electric current is constant in coil.
In above formula, I
2it is the electric current that transmitting terminal amplifies coil 20; W is the voltage angle frequency of high-frequency ac power 11; M is the coupling inductance amount that transmitting coil 10 and transmitting terminal amplify coil 20; Z
1refer under the condition not considering other coils, the impedance of transmitting coil 10 self; Z
2refer under the condition not considering other coils, transmitting terminal amplifies the parallel impedance of coil 20 and the second resonance compensation electric capacity C2; Z '
1it is the equiva lent impedance that the output impedance of transmitting coil 10, first resonance compensation electric capacity C1 and high-frequency ac power 11 is coupled to that transmitting terminal amplifies coil 20; U1 is the input voltage of transmitting coil 10; Z '
2it is the equiva lent impedance that transmitting terminal amplifies that coil 20, second resonance compensation electric capacity C2 is coupled to transmitting coil 10; Z
othe output impedance of this device front end high-frequency ac power (11).
Claims (1)
1. a Contactless power transmission device, it is characterized in that described Contactless power transmission device comprises the transmitting coil (10) being parallel with the first parallel resonance compensation condenser (C1), the transmitting terminal being parallel with the second parallel resonance compensation condenser (C2) amplifies coil (20), the receiving terminal being parallel with the 3rd parallel resonance compensation condenser (C3) amplifies coil (30), and is parallel with the receiving coil (40) of the 4th parallel resonance compensation condenser (C4); Electric energy flows to transmitting coil (10) by the high frequency electric source (11) being connected on described device front end, transmitting terminal amplifies coil (20), receiving terminal amplifies coil (30) and receiving coil (40), for the load (41) being connected on described device rear end; Described transmitting coil (10) and transmitting terminal amplify coil (20) and form emitter, and receiving terminal amplifies coil (30) and forms receiving system with receiving coil (40);
Described transmitting coil (10), transmitting terminal amplify coil (20), receiving terminal amplifies coil (30) and receiving coil (40) all adopts multi-turn structure;
Described transmitting terminal amplifies coil (20) and is less than 30% with the natural resonance frequency of the second parallel resonance building-out capacitor (C2) with the deviation of the electric voltage frequency of the emitter described in input, and receiving terminal amplifies coil (30) and is less than 30% with the natural resonance frequency of the 3rd parallel resonance building-out capacitor (C3) with the deviation of the electric voltage frequency of the described receiving system of input;
The size of the first described parallel resonance building-out capacitor (C1), the second parallel resonance building-out capacitor (C2), the 3rd parallel resonance building-out capacitor (C3) and the 4th parallel resonance building-out capacitor (C4) is adjustable, and by regulating the value of the parallel resonance building-out capacitor described in 4 to change 4 coils to the multiplication factor in magnetic field and parallel resonance building-out capacitor (C1, C2, C3, C4) voltage;
The electric voltage frequency of described Contactless power transmission device work is between 20KHZ to 500KHZ;
It is identical with the size of receiving coil (40) that described transmitting coil (10), transmitting terminal amplify coil (20), receiving terminal amplifies coil (30), transmitting coil (10), transmitting terminal amplify coil (20), receiving terminal amplifies coil (30) and receiving coil (40) parallel placement, and what transmitting coil (10), transmitting terminal amplified coil (20), receiving terminal amplification coil (30) and receiving coil (40) is centrally located on same axis; Coil described in four is put successively sequentially for transmitting coil (10), transmitting terminal amplify coil (20), receiving terminal amplification coil (30), receiving coil (40), or receiving coil (40), receiving terminal amplification coil (30), transmitting terminal amplification coil (20), transmitting coil (10);
The distance that described transmitting coil (10) and transmitting terminal amplify between coil (20) is less than 10mm, and the distance that described receiving terminal amplifies coil (30) and receiving coil (40) is less than 10mm; The distance that transmitting terminal amplifies between coil (20) and receiving terminal amplification coil (30) is 100-500mm.
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| CN201210477563.0A CN102946156B (en) | 2012-11-21 | 2012-11-21 | Wireless power transmission device |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208866B (en) * | 2013-04-23 | 2015-09-16 | 中国科学院电工研究所 | A kind of method for designing of Contactless power transmission device |
| CN103633746A (en) * | 2013-11-04 | 2014-03-12 | 上海华勤通讯技术有限公司 | Wireless power supply device, wireless charging device and mobile terminal |
| CN103647358B (en) * | 2013-12-18 | 2016-03-30 | 中国科学院电工研究所 | A kind of coil of wireless energy transform device |
| CN104065177B (en) * | 2014-06-14 | 2016-06-01 | 中国科学院电工研究所 | A kind of wireless energy transform device |
| KR102536828B1 (en) * | 2016-02-12 | 2023-05-25 | 엘지이노텍 주식회사 | Wireless Charging Device Using Multi-Coil and Operational Method Thereof |
| 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 |
| CN106828177A (en) * | 2017-03-31 | 2017-06-13 | 中国地质大学（武汉） | A kind of liftable wireless electric vehicle charging device |
| CN107359705A (en) * | 2017-09-07 | 2017-11-17 | 中国矿业大学(北京) | A kind of asymmetric wireless power transmission systems and its electric power distribution |
| CN108683266B (en) * | 2018-04-11 | 2021-04-09 | 南京航空航天大学 | Wireless power transmission method and system |
| CN114994389B (en) * | 2022-05-25 | 2023-09-26 | 北京中联太信科技有限公司 | Magnetic superconducting micro-direct current detection device and method |
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| CN102227860A (en) * | 2008-12-01 | 2011-10-26 | 株式会社丰田自动织机 | Non-contact power transmission apparatus and design method |
| CN102437656A (en) * | 2011-12-22 | 2012-05-02 | 重庆大学 | Wireless energy transmission system based on magnetic resonance array |
| CN203014500U (en) * | 2012-11-21 | 2013-06-19 | 中国科学院电工研究所 | Wireless electric power transmission device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8278784B2 (en) * | 2008-07-28 | 2012-10-02 | Qualcomm Incorporated | Wireless power transmission for electronic devices |
| JP5691458B2 (en) * | 2010-03-31 | 2015-04-01 | 日産自動車株式会社 | Non-contact power feeding apparatus and non-contact power feeding method |
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|---|---|---|---|---|
| CN102227860A (en) * | 2008-12-01 | 2011-10-26 | 株式会社丰田自动织机 | Non-contact power transmission apparatus and design method |
| CN102437656A (en) * | 2011-12-22 | 2012-05-02 | 重庆大学 | Wireless energy transmission system based on magnetic resonance array |
| CN203014500U (en) * | 2012-11-21 | 2013-06-19 | 中国科学院电工研究所 | Wireless electric power transmission device |
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