CN107221734B - A kind of commissure formula resonant cavity for wireless power transfer - Google Patents

A kind of commissure formula resonant cavity for wireless power transfer Download PDF

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Publication number
CN107221734B
CN107221734B CN201710452160.3A CN201710452160A CN107221734B CN 107221734 B CN107221734 B CN 107221734B CN 201710452160 A CN201710452160 A CN 201710452160A CN 107221734 B CN107221734 B CN 107221734B
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resonant cavity
commissure
wireless power
power transfer
segment
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CN107221734A (en
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郭菲菲
丁帅
唐欢
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00Resonators of the waveguide type
    • H01P7/06Cavity resonators

Abstract

The invention discloses a kind of commissure formula resonant cavities for wireless power transfer, belong to electronic technology field.The commissure formula resonant cavity is composed of multiple segment blades and commissure ring;Each segment blade is reeded fan-shaped shape;There are pedestal and commissure ring on groove, symmetrical segment blade is connected with each other;The present invention applies in wireless power transmission system, and the method coupled using near field electromagnetic field resonance is allowed energy to be detached from the limitation of conducting wire, is wirelessly transferred, and is high-efficient, can carry out multi-direction coupling, volume compact.The invention is so that resonant cavity work electric field in Π mode is concentrated on close to the region in the center of circle, and is enhanced with the reduction of radius;Magnetic field concentration enhances in the region far from the center of circle with the increase of radius.It is more conducive to improving the efficiency of wireless power transfer in this way.When two cavitys carry out wireless power transfer, there is very high efficiency of transmission.

Description

A kind of commissure formula resonant cavity for wireless power transfer
Technical field
The invention belongs to electronic technology field, it is related to a kind of volume compact type resonant cavity of high q-factor, which can be with Multi-direction coupling is carried out, to achieve the purpose that carry out multi-faceted wireless power transfer.Wireless function is used for more particularly to one kind The commissure formula resonant cavity of rate transmission.
Background technique
With the continuous development of society, electronic equipment gradually plays irreplaceable role in people's lives, and Electronic equipment is usually constructed with a common disadvantage: battery capacity is not high;Therefore people usually need to carry and electronic equipment phase Matched charger is to achieve the purpose that charge in time.At this point, the rise of wireless charging can be very good solution tradition just to be had The problem of line charge electricity.Up to the present, wireless power transfer can be generally divided into three categories: induction wireless power passes Defeated, coupled resonance formula wireless power transfer, electromagnetic radiation formula wireless power transfer.
The cardinal principle of induction wireless power transfer is electromagnetic induction.It is put into primary coil and secondary coil Different magnetisable material, so that energy is transmitted to secondary coil by primary coil by electromagnetic induction, to reach wireless power The purpose of transmission.The mode of this wireless power transfer is chiefly used in the environment in low frequency near field.
Wireless power transfer can be divided mainly into radio waves type, induction, laser type, ultrasonic wave according to circulation way Formula wireless power transfer.Wherein coupled resonance formula wireless power transfer mainly passes through near field electromagnetic field coupling progress energy biography It is defeated.Its cardinal principle be so that by transmitting coil it is identical with the resonance frequency of receiving coil, with generate resonance, to reach energy Measure the purpose of transmission.It is mainly used in the environment in high frequency near field.
For wireless power transfer, the efficiency of wireless power transfer is usually whether to determine wireless power transfer model One of practical key factor.The volume of existing wireless power transfer resonant cavity is not compact enough, therefore wireless power transfer Efficiency it is not high enough, how further to improve efficiency is one of urgent problem.1988, hertz was in verifying max When the fluctuation theory of Wei, the transmitting and reception of electromagnetic wave are realized, this is the initiation experiment of wireless power transfer.1989, Tesla takes the lead in proposing the concept of wireless power transfer, is dedicated to realizing global radio transmission of electricity, and the Success in Experiment point of tesla 2 50 watts of electric light outside bright 26 miles.2006, the Marin Soljacic of Massachusetts Institute Technology taught initiative Propose the resonance coupling using electromagnetic field to carry out the concept of wireless power transfer, and successfully in the place of distance 2.1m The light bulb of a 60W is lighted.This experiment provides a new approaches for the research of wireless power transfer.2008, Bombardier company has developed a kind of wireless power transfer system applied to tramcar and light rail.Wireless power in text passes Defeated model is proposed under the inspiration of the Marin Soljacic magnetic coupling resonance proposed.This wireless power transfer model is in gold The each cavity for belonging to intracavitary couples the purpose for realizing wireless power transfer by resonance, while can be by realizing cavity fluting to more The coupling in a direction.
Summary of the invention
It is an object of the invention to: aiming at the problem that transmission efficiency is low for existing resonant cavity, the present invention provides a kind of for nothing The commissure formula resonant cavity of linear heat generation rate transmission.The present invention is based on the methods of near field resonance coupling, propose the height of a volume compact The resonant cavity model of quality factor, and the model is made to work in Π mode, reach requirement of the wireless power transfer for efficiency.
The model volume compact, while being also possible that the Π mould with excellent electromagnetic property is used for energy transmission, into one Step improves the efficiency of wireless power transfer.The model has volume compact, and high quality factor, mass production is at low cost, efficiency High advantage.
Technical solution of the present invention are as follows:
A kind of commissure formula resonant cavity for wireless power transfer, including resonant cavity, coaxial fitting, the resonant cavity cavity Be inside a circular cylindrical cavity, further include upper cover plate on the resonant cavity, upper cover plate is equipped with through-hole, in resonant cavity at least provided with Two pairs of segment blades, segment blade is centrosymmetric on the same circumference to be uniformly distributed;Segment both ends of the blade is symmetrically set It is fluted, the different pedestal of radius is provided in groove, setting radius is different in the groove of adjacent segment blade the same end Pedestal, the interior pedestal radius being arranged of the groove of adjacent segment blade opposite end are identical;
The the first commissure ring and the second commissure ring of setting circular ring shape, the first commissure ring in the groove of segment blade the same end The pedestal small with radius is connected, and the second commissure ring pedestal big with radius is connected;
The segment leaf that the bottom end of coaxial fitting is protruded into the intracavitary of resonant cavity by through-hole and is fixed in resonant cavity On piece.A kind of commissure formula resonant cavity for wireless power transfer, the coaxial fitting are used for connecting signal source.
A kind of commissure formula resonant cavity for wireless power transfer, the resonant cavity are square column type.
A kind of commissure formula resonant cavity for wireless power transfer, resonant cavity side are equipped with fluting or resonance It is opposite with upper cover plate on chamber to be equipped with dismountable lower cover plate.
A kind of commissure formula resonant cavity for wireless power transfer, resonant cavity, coaxial fitting segment blade, bottom Seat, the first commissure ring, the second commissure ring material be brass.
A kind of commissure formula resonant cavity for wireless power transfer, the resonant cavity side length of square column type is 112mm, high For 68mm, cover sheet thickness 4mm.
A kind of commissure formula resonant cavity for wireless power transfer, the height of segment blade are 50mm, resonance Height of the upper cover plate 11 of chamber 1 apart from segment blade 3 is 13mm, and the radian of the cavity between two neighboring segment blade is 50 degree, the radian of each segment blade is 40 degree, and the cylindrical cavity radius of the centre of commissure formula resonant cavity is 14mm.Due to After adopting the above technical scheme, the beneficial effects of the present invention are:
The characteristics of resonant cavity of the present invention program is coupled according to resonant cavity near field resonance, can carry out energy efficient transmission Wireless power transfer realizes high q-factor, the transmission of the efficient energy of volume compact type.With existing wireless power transfer model Compare, the model can efficient progress wireless power transfer, service efficiency is higher, volume is more compact.
The Π mode of the resonant cavity is nondegenerate mode, has high-efficient work characteristics, when the resonant cavity works in Π When mode, in adjacent resonant cavity, electromagnetism is identical as magnetic field amplitude, phase phase difference 180 degree.Electric field strength is radially by justifying The heart successively successively decreases outward, and magnetic field strength is successively progressively increased by the center of circle outward radially.That is the electric field of resonant cavity mainly collects In in the position close to the center of circle, magnetic field is concentrated mainly on the position far from the center of circle.Just because of Π mode has such excellent spy Property, it is possible to Π mode is applied to wireless power transfer.The present invention is according to electromagnetic field the characteristics of near field can generate resonance coupling It is more efficient when allowing to carry out wireless power transfer.
Two identical above-mentioned resonant cavities are taken, make two resonant cavities symmetrically placed, and make the cavity phase of two resonant cavities It is right, as shown in Figure 8.Constantly change the relative distance between two resonant cavities, two resonant cavities can be calculated by emulation The efficiency of wireless power transfer is carried out in different distance.
In conclusion the present invention be applied to wireless power transfer in, using near field electromagnetic field resonance couple, realize for The wireless transmission of energy.Due to the characteristics of geomagnetic field distribution of the basic mode Π mould of the model, so that the model is with very high wireless defeated Energy efficiency, efficiency of transmission can achieve 87.5%.
Simultaneously as the basic mode of the model and first higher mode are all the modes of averaging type, it can work at the same time, have Unique advantage not available for other models.When carrying out wireless power transfer between two resonant cavities, due to basic mode Π mould Good characteristic, so that the resonant cavity carries out having very high efficiency of transmission when wireless power transfer.
The resonant cavity has very high Q value simultaneously, and volume compact is convenient for engineer application.
Detailed description of the invention
Fig. 1 is elevated cross section structure chart of the present invention;
Fig. 2 is integral outer structure chart of the present invention;
Fig. 3 be the present invention with commissure ring when top view;
Fig. 4 is front cross-sectional structure chart of the present invention;
Fig. 5 is structure chart when commissure formula resonant cavity carries out wireless power transfer;
Fig. 6 is the S11 of commissure formula resonant cavity model of the present invention;
The field distribution of Fig. 7 commissure formula resonant cavity longitudinal section under Π mode;
The Distribution of Magnetic Field of Fig. 8 commissure formula resonant cavity longitudinal section under Π mode;
Field distribution of Fig. 9 commissure formula resonant cavity in Π mode down cross-sectional;
Distribution of Magnetic Field of Figure 10 commissure formula resonant cavity in Π mode down cross-sectional;
Figure 11 commissure formula resonant cavity carries out S11, S21 when wireless power transfer;
Figure 12 commissure formula resonant cavity carry out wireless power transfer when under Π mode longitudinal section field distribution;
Figure 13 commissure formula resonant cavity carry out wireless power transfer when under Π mode longitudinal section Distribution of Magnetic Field;
In the field distribution of Π mode down cross-sectional when Figure 14 commissure formula resonant cavity progress wireless power transfer;
In the Distribution of Magnetic Field of Π mode down cross-sectional when Figure 15 commissure formula resonant cavity progress wireless power transfer.
Marked in the figure: 1- resonant cavity, 11- upper cover plate, 12- through-hole, 2- coaxial fitting, the bottom end of 21- coaxial fitting, 3- fan Body blade, 4- groove, 51- the first commissure ring, 52- the second commissure ring, 6- pedestal.
Specific embodiment
All features disclosed in this specification can be with any other than mutually exclusive feature and/or step Mode combines.
It elaborates below with reference to Fig. 1-Figure 15 to the present invention.
As shown in Figure 1, a kind of commissure formula resonant cavity for wireless power transfer, including resonant cavity 1, coaxial fitting 2, institute Stating is a circular cylindrical cavity in 1 cavity of resonant cavity, further includes upper cover plate 11 on the resonant cavity 1, and upper cover plate 11 is equipped with logical Hole 12, resonant cavity 1 is interior at least provided with two pairs of segment blades 3, and segment blade 3 is centrosymmetric on the same circumference uniformly to be divided Cloth;3 both ends of segment blade are symmetrically arranged with groove 4, and the different pedestal 6 of radius, adjacent segment blade 3 are provided in groove 4 The different pedestal 6 of setting radius in the groove 4 of the same end, the interior pedestal 6 being arranged of the groove 4 of adjacent 3 opposite end of segment blade Radius is identical;
The the first commissure ring 51 and the second commissure ring 52 of setting circular ring shape in the groove 4 of 3 the same end of segment blade, first The commissure ring pedestal small with radius is connected, and the second commissure ring pedestal big with radius is connected;
The bottom end 21 of coaxial fitting 2 passes through the fan that through-hole 12 protrudes into the intracavitary of resonant cavity 1 and is fixed in resonant cavity 1 On body blade 3.
A kind of commissure formula resonant cavity for wireless power transfer, the coaxial fitting 2 are used for connecting signal source.
A kind of commissure formula resonant cavity for wireless power transfer, the resonant cavity 1 are square column type.
A kind of commissure formula resonant cavity for wireless power transfer, 1 side of resonant cavity are equipped with fluting or resonance Dismountable lower cover plate is equipped with 11 relative position of upper cover plate on chamber 1.
A kind of commissure formula resonant cavity for wireless power transfer, resonant cavity 1,2 segment blade of coaxial fitting 3, pedestal 6, the first commissure ring 51, the second commissure ring 52 material be brass.
A kind of commissure formula resonant cavity for wireless power transfer, 1 side length of resonant cavity of square column type are 112mm, A height of 68mm, cover sheet thickness 4mm.
A kind of commissure formula resonant cavity for wireless power transfer, the height of segment blade 3 are 50mm, resonance Height of the upper cover plate 11 of chamber 1 apart from segment blade 3 is 13mm, the radian of the cavity between two neighboring segment blade 3 It is 50 degree, the radian of each segment blade 3 is 40 degree, and the cylindrical cavity radius among commissure formula resonant cavity is 14mm.
A kind of commissure formula resonant cavity model for wireless power transfer, as shown in Figure 1, the outside of commissure formula resonant cavity is One side length is the square column of 112mm, a height of 68mm.For commissure formula intra resonant cavity there are four segment blade, segment blade is high Degree is 50mm, and each segment blade has asymmetric pedestal up and down, and pedestal is for connecting commissure ring and segment blade position In submounts be commissure ring;
Fig. 4 is front cross-sectional structure chart of the present invention.It should be noted that Fig. 4 has been merely given as a kind of specific embodiment party Formula is the proof to the technology of the present invention effect, and is not limitation of the invention further, and those skilled in the art are according to this The description of inventive technique scheme, it should be determined that the present invention has more similar implementations.
As shown in Figure 4: resonant cavity, the i.e. outside of commissure formula resonant cavity are the sides that a side length is 112mm, a height of 68mm Column, upper and lower cover plates with a thickness of 4mm, but Resonator design at the shape of square column only to facilitate processing, for reality Model result do not have a significant impact.The commissure formula intra resonant cavity segment blade all the same there are four size, shape, fan Body blade height is 50mm, and distance of the segment blade apart from upper cover plate is 13mm, segment blade apart from lower cover plate away from From for 5mm, each segment blade has a symmetrical groove up and down, have on each groove one for commissure ring to be arranged Pedestal.The top of pedestal for commissure ring to be arranged is commissure ring, up and down each commissure ring different there are two radius, i.e., and the One commissure ring and the second commissure ring.
Two identical above-mentioned resonant cavities are taken, it is symmetrically placed, and make the cavity of two resonant cavities opposite, with one of them The coaxial fitting of resonant cavity is as port 1, using the coaxial fitting of another resonant cavity as port 2.By Computer Simulation meter It calculates, the S11 of available commissure formula resonant cavity model, wherein when S11 finger tip mouth 2 connects matched load, the reflection system of port 1 Number, the curve graph of S11 are as shown in Figure 6;The above-mentioned commissure formula resonant cavity model for wireless power transfer can also be obtained simultaneously The vector distribution of electric field and magnetic field under Π mode is respectively as shown in Fig. 7, Fig. 8, Fig. 9, Figure 10.Wherein Fig. 7 is that commissure formula is humorous The chamber that shakes carries out structure chart when wireless power transfer, and Fig. 8 is the magnetic vector point of commissure formula resonant cavity longitudinal section under Π mode Butut.Wherein Fig. 9 is electric field intensity distribution map of the commissure formula resonant cavity in Π mode down cross-sectional, and Figure 10 is commissure formula resonant cavity In the magnetic vector distribution map of Π mode down cross-sectional.The above simulation result has further confirmed the presence of model Π mode, Electric field is concentrated mainly on the position in the center of circle, and magnetic field is concentrated mainly on the position far from the center of circle.
By the coaxial fitting of upper cover plate to resonant cavity feed-in Gauss sinusoidal signal, obtain S11 for Π mode lower than- 7dB is lower than -8dB for the S11 of Π -1 mode.Π mode is non-merger mode, is the basic mode of resonant cavity.By Fig. 7, Fig. 8 and figure 9, Figure 10 is it can be concluded that the electric field of Π mode is concentrated mainly on position of the resonant cavity close to the center of circle, and with radius Reduction and enhance;The magnetic field of Π mode is concentrated mainly on position of the resonant cavity far from the center of circle, and increases with the increase of radius By force.Therefore, wireless function can be carried out by way of to resonant cavity fluting according to this characteristic of resonant cavity Π mode Rate transmission.
Fig. 5 gives a kind of model schematic when commissure formula resonant cavity carries out wireless power transfer.It can be seen by Fig. 5 It arrives, takes two identical above-mentioned resonant cavities, it is symmetrically placed, and make the cavity of two resonant cavities opposite, with one of resonance The coaxial fitting of chamber is as port 1, using the coaxial fitting of another resonant cavity as port 2.It is humorous by constantly changing two Relative distance between vibration chamber, and the effect that two resonant cavities carry out wireless power transfer in different distance is gone out by simulated measurement Rate.Figure 11 gives S11, S21 when commissure formula resonant cavity carries out wireless power transfer, wherein S21 refers to that port 2 connects Transmission coefficient when with load, between port 1 and port 2.According to Computer Simulation as a result, two resonant cavities can be calculated In distance 35mm, the efficiency of the wireless power transfer can achieve 87%.It can see by Figure 12, Figure 13, Figure 14 and Figure 15 State commissure formula resonant cavity carry out wireless power transfer when under Π mode longitudinal section and cross section magnetic distribution.Further card The real feasibility that wireless power transfer is carried out by way of to above-mentioned resonant cavity fluting.

Claims (7)

1. a kind of commissure formula resonant cavity for wireless power transfer, including resonant cavity (1), coaxial fitting (2), feature exists In being a circular cylindrical cavity in resonant cavity (1) cavity, further include upper cover plate (11), upper cover plate on the resonant cavity (1) (11) through-hole (12) are equipped with, at least provided with two pairs of segment blades (3) in resonant cavity (1), segment blade (3) is in same circle It is centrosymmetric and is uniformly distributed on week;The upper and lower ends of segment blade (3) are symmetrically arranged with groove (4), in each groove (4) The pedestal (6) different there are two radius, the pedestal being correspondingly arranged in the groove (4) of adjacent segment blade (3) the same end are set (6) radius is identical, and pedestal (6) radius being arranged in the symmetrical groove of each segment blade (3) upper and lower side (4) is identical;It is fan-shaped The the first commissure ring (51) and the second commissure ring (52) of setting circular ring shape, the first commissure in the groove (4) of body blade (3) the same end The ring pedestal small with radius is connected, and the second commissure ring pedestal big with radius is connected;The bottom end (21) of coaxial fitting passes through through-hole (12) the intracavitary of resonant cavity (1) is protruded into and on a segment blade (3) being fixed in resonant cavity (1).
2. a kind of commissure formula resonant cavity for wireless power transfer according to claim 1, which is characterized in that described same Shaft coupling (2) is used for connecting signal source.
3. a kind of commissure formula resonant cavity for wireless power transfer according to claim 1, which is characterized in that described humorous Chamber (1) is shaken for square column type.
4. a kind of commissure formula resonant cavity for wireless power transfer according to claim 1 to 3, which is characterized in that Resonant cavity (1) side is equipped on fluting or resonant cavity (1) opposite equipped with dismountable lower cover plate with upper cover plate (11).
5. a kind of commissure formula resonant cavity for wireless power transfer according to claim 4, which is characterized in that resonant cavity (1)、
Coaxial fitting (2) segment blade (3), pedestal (6), the first commissure ring (51), the second commissure ring (52) material be Brass.
6. a kind of commissure formula resonant cavity for wireless power transfer according to claim 5, which is characterized in that square column type Resonant cavity (1) side length be 112mm, a height of 68mm, cover sheet thickness 4mm.
7. a kind of commissure formula resonant cavity for wireless power transfer according to claim 6, which is characterized in that segment The height of blade (3) be 50mm, height of the upper cover plate (11) of resonant cavity (1) apart from segment blade (3) be 13mm, adjacent two The radian of cavity between a segment blade (3) is 50 degree, and the radian of each segment blade (3) is 40 degree, and commissure formula is humorous Cylindrical cavity radius among vibration chamber is 14mm.
CN201710452160.3A 2017-06-15 2017-06-15 A kind of commissure formula resonant cavity for wireless power transfer Active CN107221734B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1996659A (en) * 2005-12-28 2007-07-11 中国科学院电子学研究所 The high-frequency circuit structure for the mutual conversion of the coaxial electric mode of the rectangular waveguide mode and round waveguide
CN106300688A (en) * 2015-06-05 2017-01-04 江苏嘉钰新能源技术有限公司 A kind of resonator for wireless electric vehicle charging device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8274178B2 (en) * 2009-06-21 2012-09-25 Christopher Allen Tucker System of transmission of wireless energy
US9184487B2 (en) * 2012-11-05 2015-11-10 Electronics And Telecommunications Research Institute Resonantor structure for wireless power transfer system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1996659A (en) * 2005-12-28 2007-07-11 中国科学院电子学研究所 The high-frequency circuit structure for the mutual conversion of the coaxial electric mode of the rectangular waveguide mode and round waveguide
CN106300688A (en) * 2015-06-05 2017-01-04 江苏嘉钰新能源技术有限公司 A kind of resonator for wireless electric vehicle charging device

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