CN102946156A - Wireless power transmission device - Google Patents
Wireless power transmission device Download PDFInfo
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- CN102946156A CN102946156A CN2012104775630A CN201210477563A CN102946156A CN 102946156 A CN102946156 A CN 102946156A CN 2012104775630 A CN2012104775630 A CN 2012104775630A CN 201210477563 A CN201210477563 A CN 201210477563A CN 102946156 A CN102946156 A CN 102946156A
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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
The wireless power transmission application prospect is extensive, but existing Contactless power transmission device power is little, and efficient is low, and transmission range is very near, is mainly used in electronic equipment charging occasion, and this technology is difficult to use in large-power occasions.
Wireless power transmission is applied to such as large-power occasions (such as charging electric vehicle) significant, also is study hotspot in recent years.But this application scenario requires wireless power transmission power to reach at least the KW level, and other power delivery of this grade necessarily requires very high power transmission efficiency, otherwise not only can produce huge energy loss, and the heat radiation of device also is a very scabrous problem.Existing wireless power transmission scheme can't satisfy this large-power occasions.
Assistant professor MarinSoljacic research group of department of physics of in November, 2006 Massachusetts Institute Technology (MIT) has proposed the magnetic coupling harmonic technology, and carried out experimental verification in June, 2007, the 2.16m of being separated by lights a 60W bulb every sky, and efficient is 40%.But the power delivery of 60W still can not satisfy the power demand of large-power occasions KW level far away, and the operating frequency about the 10MHz that mentions in the article has brought difficulty also for the design of the high power switching power supply power in the Contactless power transmission device.
After the magnetic coupling harmonic technology proposed, many wireless power transmission schemes based on this technology were suggested in succession, and their common feature is: in order to improve performance, with 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 the resonance point, the voltage that it bears will be very high, and this has higher requirement for 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), the second coil and tertiary coil are operated in resonance condition, resonance frequency is 2～7MHz, this structure is used in powerful occasion will produces following 3 problems: 1. high-frequency high power switching power supply difficult design like this; 2. the mutual inductance meeting of the first coil and the 4th coil and other coil causes interference to resonance point; 3. if the second coil and tertiary coil are fully operational on the 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 provides a kind of powerful Contactless power transmission device, is difficult to be applied to the problem of large-power occasions (such as charging electric vehicle) to solve the current wireless power transmission technology.
For solving the problems of the technologies described above, the invention provides a kind of powerful Contactless power transmission device, comprise that high frequency electric source, load, transmitting coil, transmitting terminal amplify 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 consist of emitter, and receiving terminal amplifies coil and receiving coil consists of receiving system.
It is identical with the receiving coil size that described transmitting coil, transmitting terminal amplify coil, receiving terminal amplifies coil, parallel placement.Being centered close on the same central axis of four coils, put successively order and be transmitting coil---transmitting terminal amplification coil---receiving terminal amplification coil---receiving coil, or receiving coil---receiving terminal amplification coil---transmitting terminal amplifies coil---transmitting coil.
Transmitting coil and transmitting terminal amplify the distance between the coil, and the close together between receiving coil and the receiving terminal amplification coil, less than 10mm.The distance that transmitting terminal amplifies between coil and the receiving terminal amplification coil is larger, 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 shapes such as circle or square, hexagon, octagon.Coil winding becomes multiturn, but coiled also can the coiled plate-like.Coil can adopt sub-thread enamelled wire, the coiling of multiply enamelled wire, and the 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 the coil.The lc circuit that each coil and resonance compensation electric capacity in parallel separately consist of.Described lc circuit not necessarily works in the 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 from resonance point away from; 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 the 500KHz frequency.Can regulate Shunt compensation capacitor value, coil turn, the coil dimension of each coil in the Contactless power transmission device according to power and transmission range, the output impedance of this device front end series connection high-frequency ac power, the impedance of this device rear end series load, the factors such as maximum voltage value of each coil permission of wireless power transmission, make Contactless power transmission device reach best operating point.
During the work of this Contactless power transmission device, transmitting coil is magnetic field energy with the electric energy conversion of the high frequency electric source output of this device front end series connection, and transfer its energy to transmitting terminal by the magnetic Field Coupling principle and amplify coil, transmitting terminal amplifies coil and utilizes its low-impedance characteristic, magnetic field amplified and be passed to receiving terminal amplify coil, receiving terminal amplifies coil and utilizes its low-impedance characteristic, the magnetic field that receives is further amplified, and passing to receiving coil by magnetic Field Coupling, receiving coil is converted into electric energy with magnetic field energy and exports load to.Transmitting coil and transmitting terminal amplify coil utilization resonance compensation electric capacity separately, the degree of coupling that Effective Raise is mutual, and be that magnetic field energy is launched with electric energy conversion.Receiving terminal amplifies coil and receiving coil utilization resonance compensation electric capacity separately, and the magnetic field energy that effectively receives also is converted into electric energy.Transmitting coil, transmitting terminal amplification coil, receiving terminal amplify coil, receiving coil has all played the magnetic field amplification, multiplication factor separately 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 approaching, and coil is higher to the multiplication factor in magnetic field.
The coil multiplication factor improves will increase the electric current of coil and the voltage of shunt capacitance, bring threat for the safety and stability of this Contactless power transmission device work, proposed under the prerequisite that satisfies the power delivery requirement, by reducing the multiplication factor of each coil, to reduce electric current and the voltage of each coil for this reason.
Beneficial effect: compare with existing wireless power transmission technology, the present invention has following advantage
1. operating frequency is low.Similar technical work frequency is mostly at several MHZ even tens of MHZ, high-frequency high power switching power supply difficult design like this, and the highest design frequency of the present invention is 500KHZ, and the Switching Power Supply simplicity of design of this frequency, power output is large, and efficient is high.
2. the voltage endurance capability of each parts and the insulating requirements of equipment are reduced.The present invention greatly reduces the magnitude of voltage of Contactless power transmission device each several part from safety and the design of stable angle of Contactless power transmission device, has reduced insulation costs.
3. long transmission distance.Transmission range is between the 100mm to 500mm.
4. through-put power is large, and efficient is high.Can transmit the electric energy of number KW, efficient reaches more than 85%.
Description of drawings
Fig. 1 is the structure chart of this device, among the figure: 10 transmitting coils, C1 the first parallel resonance compensation condenser, 11 high-frequency ac powers, 20 transmitting terminals amplify coil, C2 the 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 of 4 coils with resonance compensation electric capacity, and with the air gap coupling, the transmitting coil front end has high-frequency ac power 11, termination load 41 behind the receiving coil between the coil.
Transmitting coil 10 amplifies coil 20 with transmitting terminal and consists of emitter, and receiving terminal amplifies coil 30 and consists of receiving system with receiving coil 40.
As a kind of embodiment, with transmitting coil 10, transmitting terminal amplify coil 20, receiving terminal amplify 4 coils such as coil 30, receiving coil 40 all the coiled diameter be the spiral coil of 500mm.Coil is by multiply enamelled wire coiled, and transmitting coil 10 and the receiving coil 40 coiling numbers of turn are 2 circles, and it is 5 circles with the receiving terminal amplification coil 30 coiling numbers of turn that transmitting terminal amplifies coil 20.Distance between transmitting coil 10 and the transmitting terminal amplification coil 20 is less than 5mm, and is same, and the distance between receiving coil 40 and the receiving terminal amplification coil 30 is less than 5mm.The distance that transmitting terminal amplifies between coil 20 and the receiving terminal amplification coil 30 is 250mm.4 parallel placements of described coil, being centered close on the same axis of 4 described coils.Certainly, this structure only is a kind of example, the size of coil, and shape, the number of turn, distance, material can be adjusted according to actual conditions are different.
As shown in Figure 2, with the high-frequency ac voltage input transmitting coil 10 of civil power through obtaining after the frequency conversion, the rear termination load 41 of receiving coil 40.Amplify by regulating the first parallel resonance building-out capacitor C1, transmitting terminal on the transmitting coil 10 that the second parallel resonance building-out capacitor C2, receiving terminal on the coil 20 amplifies the 3rd parallel resonance building-out capacitor C3 on the coil 30 and the 4th parallel resonance building-out capacitor C4 on the receiving coil 40 finds an only working point, make maximum transmission power, the efficiency of transmission value, the magnitude of voltage of each coil and electric capacity all can meet design requirement.
In general, amplify the second Shunt compensation capacitor C2 of coil 20 and the 3rd parallel resonance building-out capacitor C3 on the receiving terminal amplification coil 30 by regulating transmitting terminal, when 20, C2 and 30, the natural resonance frequency of C3 and supply frequency more near the time, the maximum transmission power of apparatus of the present invention and efficient more can better be showed, but flow through on these two coils 20,30 simultaneously electric current and the voltage that bears of parallel resonance building-out capacitor C2, C3 thereof will increase.Be 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 less than 30%, namely
With
L wherein
2, L
3Be respectively transmitting terminal and amplify coil 20 and the inductance value that connects receiving terminal amplification coil 30; C
2, C
3Represent respectively the second resonance compensation electric capacity and the 3rd resonance compensation electric capacity; f
0, f
1, f
2The frequency that represents respectively high-frequency ac power 12 output voltages, transmitting terminal are amplified the natural resonance frequency of coil 20 and the second parallel resonance building-out capacitor C2 and the natural resonance frequency that receiving terminal amplifies coil 30 and the 3rd parallel resonance building-out capacitor C3.
Because the voltage on the necessary limiting coil, transmitting terminal amplify the multiplication factor of coil and receiving terminal amplification coil can not be excessive, efficient and the maximum transmission power of this meeting restraint device.Can compensate by the multiplication factor that increases transmitting coil and receiving coil in this case.As shown in Figure 2, by the first parallel resonance building-out capacitor C1 of adjusting 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 efficient and the security and stability of device reach rational scope.
Now amplify coil 20 as the effect of four resonance compensation electric capacity of example explanation adjusting to reduction coils from parallel connection of coils resonance compensation electric capacity withstand voltage take transmitting coil 10 and transmitting terminal.As shown in Figure 2, for guaranteeing magnetic Field Coupling intensity, electric current I in the coil 10 is amplified in emission
2.Must reach very large value, but the voltage of the first parallel resonance compensation C2 electric capacity in parallel on this moment transmitting coil 10
Can reach very large, at this moment only have increase C
2Just can reduce U
C2Value, but must guarantee increase C
2Shi Buhui reduces I
2, this can be realized by the first parallel resonance building-out capacitor C1 that regulates on the transmitting coil 10, reason is as follows:
Because
Wherein, Z
1=jwL
1,
As high frequency electric source output voltage U 1 and (Z
1+ Z '
2) (Z
2+ Z '
1) when constant, I
2Remain unchanged.In order to reduce the voltage of C2 electric capacity
Can be by increasing C
2With adjusting C
1Realize.Therefore regulate C
1And C
2Value can be in the situation that keep the magnitude of voltage that transmitting terminal amplifies the constant reduction of electric current transmitting terminal coils from parallel connection of coils electric capacity in the coil.
In the 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 of not considering other coils the impedance of transmitting coil 10 self; Z
2Refer under the condition of not considering other coils, transmitting terminal amplifies the parallel impedance of coil 20 and the second resonance compensation capacitor C 2; Z '
1The equiva lent impedance that transmitting terminal amplifies coil 20 is coupled in the output impedance that is transmitting coil 10, the first resonance compensation capacitor C 1 and high-frequency ac power 11; U1 is the input voltage of transmitting coil 10; Z '
2It is the equiva lent impedance that transmitting terminal amplification coil 20, the second resonance compensation capacitor C 2 are coupled to transmitting coil 10; Z
oThe output impedance of this device front end high-frequency ac power (11).
Claims (6)
1. Contactless power transmission device, it is characterized in that described Contactless power transmission device comprises the transmitting coil (10) that is parallel with the first parallel resonance compensation condenser (C1), the transmitting terminal that is parallel with the second parallel resonance compensation condenser (C2) amplifies coil (20), the receiving terminal that is parallel with the 3rd parallel resonance compensation condenser (C3) amplifies coil (30), and the receiving coil (40) that is parallel with the 4th parallel resonance compensation condenser (C4); Electric energy flows to transmitting coil (10) by the high frequency electric source that is connected on described device front end (11), and transmitting terminal amplifies coil (20), and receiving terminal amplifies coil (30) and receiving coil (40), for the load that is connected on described device rear end (41); Described transmitting coil (10) amplifies coil (20) with transmitting terminal and consists of emitter, and receiving terminal amplifies coil (30) and consists of receiving system with receiving coil (40).
2. Contactless power transmission device according to claim 1, it is characterized in that described transmitting coil (10), transmitting terminal amplify coil (20), receiving terminal amplifies the big or small identical of coil (30) and receiving coil (40), transmitting coil (10), transmitting terminal amplify coil (20), receiving terminal amplifies coil (30) and the parallel placement of receiving coil (40), and transmitting coil (10), transmitting terminal amplify coil (20), receiving terminal amplifies being centered close on the same axis of coil (30) and receiving coil (40); Four described coils are put successively order and are transmitting coil (10)---transmitting terminal amplifies coil (20)---receiving terminal amplifies coil (30)---receiving coil (40), or receiving coil (40)---receiving terminal amplifies coil (30)---transmitting terminal amplifies coil (20)---transmitting coil (10).
3. Contactless power transmission device according to claim 1 and 2, it is characterized in that described transmitting coil (10) and transmitting terminal amplify distance between the coil (20) less than 10mm, described receiving terminal amplifies the distance of coil (30) and receiving coil (40) less than 10mm; The distance that transmitting terminal amplifies between coil (20) and the receiving terminal amplification coil (30) is 100-500mm.
4. Contactless power transmission device according to claim 1, it is characterized in that the big or small adjustable of described the first 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), and can change 4 coils by the value of regulating 4 described parallel resonance building-out capacitors to multiplication factor and the parallel resonance building-out capacitor (C1 in magnetic field, C2, C3, C4) voltage.
5. Contactless power transmission device according to claim 1 is characterized in that the electric voltage frequency of described device work is between 20KHZ to 500KHZ.
6. Contactless power transmission device according to claim 1, it is characterized in that the deviation of natural resonance frequency that described transmitting terminal amplifies coil (20) and the second parallel resonance building-out capacitor (C2) and the described device electric voltage frequency of input less than 30%, the natural resonance frequency that receiving terminal amplifies coil (30) and the 3rd parallel resonance building-out capacitor (C3) and the deviation of the described device electric voltage frequency of input are less than 30%.
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| CN201210477563.0A CN102946156B (en) | 2012-11-21 | 2012-11-21 | Wireless power transmission device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103208866A (en) * | 2013-04-23 | 2013-07-17 | 中国科学院电工研究所 | Method for designing wireless 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 |
| CN103647358A (en) * | 2013-12-18 | 2014-03-19 | 中国科学院电工研究所 | Coil of wireless energy transmission device |
| CN104065177A (en) * | 2014-06-14 | 2014-09-24 | 中国科学院电工研究所 | Wireless energy transmission device |
| 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 |
| 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 |
| CN108683266A (en) * | 2018-04-11 | 2018-10-19 | 南京航空航天大学 | A kind of wireless power transmission method and system |
| CN108702031A (en) * | 2016-02-12 | 2018-10-23 | Lg伊诺特有限公司 | Wireless power device and its driving method with multiple transmit coils |
| CN114994389A (en) * | 2022-05-25 | 2022-09-02 | 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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| 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 |
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| 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 |
| CN103647358A (en) * | 2013-12-18 | 2014-03-19 | 中国科学院电工研究所 | Coil of wireless energy transmission device |
| 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 |
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| CN108702031A (en) * | 2016-02-12 | 2018-10-23 | Lg伊诺特有限公司 | Wireless power device and its driving method with multiple transmit coils |
| 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 |
| 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 |
| CN108683266A (en) * | 2018-04-11 | 2018-10-19 | 南京航空航天大学 | A kind of wireless power transmission method and system |
| CN108683266B (en) * | 2018-04-11 | 2021-04-09 | 南京航空航天大学 | Wireless power transmission method and system |
| CN114994389A (en) * | 2022-05-25 | 2022-09-02 | 北京中联太信科技有限公司 | Magnetic superconducting micro-direct current detection device and method |
| 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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