CN103312052B - A kind of antenna assembly for wireless power supply system - Google Patents
A kind of antenna assembly for wireless power supply system Download PDFInfo
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- CN103312052B CN103312052B CN201310284697.5A CN201310284697A CN103312052B CN 103312052 B CN103312052 B CN 103312052B CN 201310284697 A CN201310284697 A CN 201310284697A CN 103312052 B CN103312052 B CN 103312052B
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Abstract
The invention discloses a kind of antenna assembly for wireless power supply system, this device comprises: dispensing device, comprise high frequency electric source and transmitting antenna, high frequency electric source is the oscillation circuit that oscillator coil and equivalent oscillating capacitor form, and transmitting antenna is the series loop that transmitting coil forms with transmitting compensation condenser; Receiving system, comprises reception antenna and induction coil, and reception antenna is the series loop that receiving coil forms with reception compensation condenser, and induction coil and receiving coil are of coupled connections; Dispensing device medium-high frequency power supply produces the high frequency voltage of fixed frequency, in order to drive transmitting antenna, through the conversion of transmitting antenna, high-frequency electrical is converted to electromagnetic energy and transmits in space.Receiving system for receiving the electromagnetic energy in space, and is converted into available interchange or direct current, and induction coil utilizes the energy transferring inductively received by reception antenna to load.This invention to solve in wireless transmitting system produced problem in Antenna Design, improves energy transmission efficiency.
Description
Technical field
The present invention relates to wireless power technology, especially relate to the antenna assembly utilizing magnetic coupling harmonic technology to realize the wireless power supply system of wireless power.
Background technology
The transmission of tradition electric energy mainly utilizes plain conductor directly to contact to carry out, and this brings many inconvenience to us.And wireless power transmission is just different, electric energy is contactless from transmitting terminal to receiving terminal, improves the flexibility that power consumption equipment obtains electric energy.In addition, wireless power transmission technology also has the advantages such as wireless connections, safety, dynamic continued power, especially in special and adverse circumstances, as given mobile power supply equipment, high pressure, inflammable, hazardous applications, is widely used under water etc.Especially in the epoch of energy scarcity, the inexhaustible eco-friendly power source of space is utilized---solar energy is first-selected.
Wireless power transmission technology, by changing traditional delivery of electrical energy mode, is subject to international extensive concern, and conventional at present have three class methods, i.e. induction, electromagentic resonance formula and electromagnetic radiation formula wireless power transmission.The present invention mainly concentrates in the research of electromagentic resonance formula, namely utilizes magnetic coupling harmonic technology, and when the oscillating magnetic field frequency of power supply transmitting terminal is identical with the natural frequency of receiving terminal, receiving terminal just produces resonance, thus realizes the wireless transmission of energy.In magnetic coupling harmonic technology, the antenna of transmitting terminal and receiving terminal has been calibrated for a magnetic resonance system, can with fixing frequency vibration after energising.Energy Transfer is not by spatial obstacle thing (non magnetic) impact, and can see thus, efficiency of transmission is relevant to the diameter of transmission, received energy unit, and transmit area larger, efficiency of transmission is higher; Laser propagation effect and frequency and antenna size in close relations.Antenna assembly is the key component in wireless power transmission technology, relates to the launching and receiving of energy.The properties influence of antenna is to the transmission performance of whole system, and the analysis for antenna is also the basis researching and analysing whole wireless transmitting system.In order to simplified design during current Antenna Design, generally transmitting coil and receiving coil are designed to identical parameters, cause receiving terminal size larger, add the equiva lent impedance loss of receiving terminal antenna, and the space scattering loss between coil, be easy to the reduction causing efficiency of transmission, in addition, choosing of coil q parameter be also Antenna Design with the selection of capacitor topology is the problem that should be noted that.
Summary of the invention
The invention provides a kind of antenna assembly for wireless power supply system, solved the energy loss problem occurred in Antenna Design in current wireless transmitting system, improve energy transmission efficiency.
For achieving the above object, the present invention adopts following technical scheme:
For an antenna assembly for wireless power supply system, comprise dispensing device and receiving system:
Dispensing device, comprises high frequency electric source and transmitting antenna, and high frequency electric source is the oscillation circuit that oscillator coil and equivalent oscillating capacitor form, and transmitting antenna is the series loop that transmitting coil forms with transmitting compensation condenser, and oscillator coil and transmitting coil are of coupled connections;
Receiving system, comprises reception antenna and induction coil, and reception antenna is the series loop that receiving coil forms with reception compensation condenser, and induction coil and receiving coil are of coupled connections, and are connected in series with external loading; Reception antenna is consistent with transmitting antenna self-resonant frequency.
The inductance of the inductance of receiving coil, winding method, the number of turn and transmitting coil, winding method, the number of turn are different, receive compensation condenser capacitance different with launching compensation condenser capacitance.
Wherein in reception antenna, the winding method of receiving coil, the number of turn and receiving coil adopt different winding methods according to conditional requests such as the sizes of different occasion and determine the number of turn, such as can adopt snail coiling when volume is restricted, allow in space to adopt spatially spiral winding method; Then according to reception antenna and the transmitting antenna self-resonant frequency consistency principle, to receiving compensation condenser in reception antenna and launching compensation condenser and carry out the compensation of different capacitance, thus receiving coil utilance is improved.
Dispensing device medium-high frequency power supply produces the high frequency voltage of fixed frequency, in order to drive transmitting antenna, through the conversion of transmitting antenna, high-frequency electrical is converted to electromagnetic energy and transmits in space.Receiving system for receiving the electromagnetic energy in space, and is converted into available interchange or direct current, and induction coil utilizes the energy transferring inductively received by reception antenna to load.
Further, in order to realize effective transmission in magnetic field under near field, the aggregation of maximum raising transmitting energy, resonance frequency should be improved as much as possible, also consider the factors such as the switching frequency during existing high-power electric and electronic simultaneously, resonance frequency is not easily too high, and therefore transmitting antenna and reception antenna self-resonant frequency scope are 1MHz ~ 50MHz.
Further, for ensureing that receiving system is in the distance between the near-field region transmitting antenna of the electromagnetic field that dispensing device produces and reception antenna
wherein, λ is transmission antennas transmit electromagnetic wavelength.
Further, the high frequency electric source in emitter adopts Colpitts oscillation circuit.
Further, the compensation condenser of transmitting antenna and receiving coil all adopts additional building-out capacitor mode.
Further, according to resonance theory, the present invention is faint coupled system, therefore transmitting antenna and reception antenna quality factor q >>1/k, and wherein k is the coupling coefficient between transmitting coil and receiving coil.
Further, rule of thumb, the coupling coefficient k<0.05 between transmitting coil and receiving coil.
Beneficial effect: the design that (1) the present invention takes the parameter of transmitting coil and receiving coil inconsistent, can solve the design problem of existing radio energy transmission system transmit antenna parameter further, improves efficiency of transmission, (2) under the alternative condition meeting coil q parameter of the present invention and capacitor topology, as long as ensure that the self-resonant frequency of two coils is consistent, and meet Q value and choose condition, such as in the Energy Transfer occasion of multi-load Sensor Network, according to design of the present invention, a set of larger-size transmitting antenna can be designed, reception antenna then can according to the size design size of load, effectively utilize space, solve existing Energy Transfer transmitting and receiving antenna size parameter consistent, cause connecing that to penetrate antenna size excessive, the problem that utilance is lower, realize effective transmission of energy, improve laser propagation effect.
Accompanying drawing explanation
Fig. 1 is antenna device arrangement schematic diagram of the present invention.
Fig. 2 is aerial coil schematic diagram.
Fig. 3 is dispensing device equivalent circuit diagram of the present invention.
Fig. 4 is receiving system equivalent circuit diagram of the present invention.
Fig. 5 is the resonance curve of antenna when having a different Q value.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, the present invention includes a dispensing device and receiving system, wherein dispensing device, comprise high frequency electric source 1 and transmitting antenna 2, high frequency electric source 1 is the oscillation circuit that oscillator coil 3 forms with equivalent oscillating capacitor 4, and this oscillation circuit is Colpitts oscillation circuit; Transmitting antenna 2 is the series loop that transmitting coil 5 forms with transmitting compensation condenser 6, and oscillator coil 3 and transmitting coil 5 are of coupled connections, and launches compensation condenser 6 and adopts additional building-out capacitor mode.
Receiving system, comprises reception antenna 7 and induction coil 8, and reception antenna 7 is the series loop that receiving coil 9 forms with reception compensation condenser 10, and induction coil 8 and receiving coil 9 are of coupled connections, and are connected in series with external loading 11; By adjustment receiving coil 9 and reception compensation condenser 10, make reception antenna 7 consistent with transmitting antenna 2 self-resonant frequency.
In addition, the inductance of the inductance of receiving coil 9, winding method, the number of turn and transmitting coil 5, winding method, the number of turn are different, receive compensation condenser 10 capacitance different with launching compensation condenser 6 capacitance.
As shown in Figure 3, dispensing device medium-high frequency power supply 1 produces the high frequency voltage of fixed frequency to dispensing device equivalent circuit diagram of the present invention, in order to drive transmitting antenna 2, through the conversion of transmitting antenna 2, high-frequency electrical is converted to electromagnetic energy and transmits in space.As shown in Figure 4, receiving system reception antenna 7 receives the electromagnetic energy in space to dispensing device equivalent circuit diagram, and is converted into available interchange or direct current, and induction coil 3 utilizes the energy transferring inductively received by reception antenna 7 to external loading 11.
Antenna assembly is the important component part forming wireless power supply system, and the wireless transmission of wireless power supply system energy mainly needs transmitting antenna and reception antenna, and therefore each parameter of antenna can directly have influence on Energy Transfer effect.As shown in Figure 2, the design of antenna is whole antenna assembly part and parcel to aerial coil schematic diagram, and wherein the self-resonant frequency of transmitting antenna is determined by following formulae discovery:
Wherein L
1for transmitting coil own inductance, C
1for launching building-out capacitor value.
In order to realize effective transmission in magnetic field under near field, the aggregation of maximum raising transmitting energy, resonance frequency should be improved as much as possible, ordinary circumstance lower frequency is more than megahertz, also consider the factors such as the switching frequency during existing high-power electric and electronic simultaneously, resonance frequency is not easily too high, otherwise be difficult to realize, the inversion of power unit, therefore, we are by appropriate design transmitting coil 5 and launch compensation condenser 6, determine that the self-resonant frequency scope of transmitting antenna 2 is between 1MHz ~ 50MHz.
In reception antenna 7, the winding method of receiving coil, the number of turn and receiving coil adopt different winding methods according to conditional requests such as the sizes of different occasion and select the number of turn, final according to reception antenna and the transmitting antenna self-resonant frequency consistency principle, to the compensation receiving compensation condenser and transmitting compensation condenser in reception antenna and carry out different capacitance; The winding method of spatially spiral such as can be adopted at transmitting antenna, the number of turn 5 circle, and snail design can be adopted by volume restriction receiving terminal antenna, the number of turn is 3 circles, also different according to the antenna electric inductance value that the difference of the number of turn obtains, according to the principle that resonance frequency is consistent, can obtain in reception antenna, receiving compensation condenser and the compensation capacitance of launching compensation condenser, thus realize the resonance between two coils.
In addition, transmitting antenna 2 and reception antenna 7 all have higher quality factor q value, according to resonance theory, the faint coupled system of this system, Q should be coupling coefficient between transmitting coil and receiving coil much larger than 1/k, k, can reach resonance steady operation to make system, Q>20 based on experience value, k<0.05, k are less, as shown in Figure 5, Q value resonance curve is more sharp-pointed, and Energy Transfer is more effective.
For ensureing that receiving system is in the near-field region of the electromagnetic field that transmitting antenna 2 produces, the spacing of transmitting antenna and reception antenna is
wherein, λ is transmission antennas transmit electromagnetic wavelength.
It is below the specific embodiment of the present invention, coil parameter is sent: radius is 30 centimetres in the present embodiment, adopt spatially spiral winding, the number of turn is 3 circles, and resonant operational is 3MHz frequently, receiving coil parameter: radius is 10 centimetres, adopt snail winding, the number of turn is 6 circles, and resonant operational is 3MHz frequently, and quality factor q is 100.Coupling coefficient k is 0.01 in addition, and efficiency of transmission is 65% as calculated.According to mode transmitting coil and receiving coil being designed to identical parameters, efficiency of transmission is about 52%.As seen from the above, laser propagation effect of the present invention is higher, has better practicality.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1., for an antenna assembly for wireless power supply system, it is characterized in that comprising:
Dispensing device, comprise high frequency electric source and transmitting antenna, described high frequency electric source is the oscillation circuit that oscillator coil and equivalent oscillating capacitor form, and described transmitting antenna is the series loop that transmitting coil forms with transmitting compensation condenser, and described oscillator coil and transmitting coil are of coupled connections;
Receiving system, comprises reception antenna and induction coil, and described reception antenna is the series loop that receiving coil forms with reception compensation condenser, and described induction coil and receiving coil are of coupled connections, and are connected in series with external loading; Described reception antenna is consistent with transmitting antenna self-resonant frequency;
The inductance of the inductance of described receiving coil, winding method, the number of turn and transmitting coil, winding method, the number of turn are different, and described reception compensation condenser capacitance is different from transmitting compensation condenser capacitance, and the size of reception antenna is less than the size of transmitting antenna;
Described transmitting antenna and reception antenna self-resonant frequency scope are 1MHz ~ 50MHz;
Distance between described transmitting antenna and reception antenna
wherein, λ is transmission antennas transmit electromagnetic wavelength;
Described high frequency electric source adopts Colpitts oscillation circuit;
The compensation condenser of described transmitting antenna and reception antenna all adopts additional building-out capacitor mode;
Described transmitting antenna and reception antenna quality factor q >>1/k, wherein k is the coupling coefficient between transmitting coil and receiving coil;
Coupling coefficient k<0.05 between described transmitting coil and receiving coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310284697.5A CN103312052B (en) | 2013-07-08 | 2013-07-08 | A kind of antenna assembly for wireless power supply system |
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| CN201310284697.5A CN103312052B (en) | 2013-07-08 | 2013-07-08 | A kind of antenna assembly for wireless power supply system |
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| CN103312052B true CN103312052B (en) | 2015-08-05 |
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| JP2015192521A (en) * | 2014-03-28 | 2015-11-02 | デクセリアルズ株式会社 | Non-contact power supply antenna system and electronic apparatus |
| CN103915916B (en) * | 2014-04-23 | 2016-08-31 | 慈溪市源顺光电科技有限公司 | Magnetic resonance wireless electric energy transmission device based on planar magnetic resonance coupling coil structure |
| CN107690103A (en) * | 2017-09-29 | 2018-02-13 | 桂林电子科技大学 | A kind of headphone for supporting wireless charging |
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| CN102412635A (en) * | 2011-12-28 | 2012-04-11 | 东南大学 | Wireless power supply device of mobile equipment |
| CN102804550A (en) * | 2009-06-25 | 2012-11-28 | 株式会社村田制作所 | Power transfer system and noncontact charging device |
| CN203368155U (en) * | 2013-07-08 | 2013-12-25 | 东南大学 | Antenna apparatus for wireless power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8482157B2 (en) * | 2007-03-02 | 2013-07-09 | Qualcomm Incorporated | Increasing the Q factor of a resonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102804550A (en) * | 2009-06-25 | 2012-11-28 | 株式会社村田制作所 | Power transfer system and noncontact charging device |
| CN102412635A (en) * | 2011-12-28 | 2012-04-11 | 东南大学 | Wireless power supply device of mobile equipment |
| CN203368155U (en) * | 2013-07-08 | 2013-12-25 | 东南大学 | Antenna apparatus for wireless power supply system |
Non-Patent Citations (2)
| Title |
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| 磁耦合谐振式无线电能传输系统串并式模型研究;黄学良等;《电工技术学报》;20130331;第28卷(第3期);第171-187页 * |
| 谭林林等.基于频率控制的磁耦合共振式无线电力传输系统传输效率优化控制.《中国科学:技术科学》.2011,第41卷(第7期),第913-919页. * |
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