CN104242484A - Magnetic coupling resonant mode multi-load wireless power tree-type transmission network with load isolating characteristic - Google Patents
Magnetic coupling resonant mode multi-load wireless power tree-type transmission network with load isolating characteristic Download PDFInfo
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- CN104242484A CN104242484A CN201410480500.XA CN201410480500A CN104242484A CN 104242484 A CN104242484 A CN 104242484A CN 201410480500 A CN201410480500 A CN 201410480500A CN 104242484 A CN104242484 A CN 104242484A
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Abstract
A magnetic coupling resonant mode multi-load wireless power tree-type transmission network with the load isolating characteristic comprises a plurality of relay resonators, access resonators, an inversion alternating voltage source and a plurality of loads. Two and only two adjacent access resonators are located around each relay resonator. The mutual reactance of an induction coil of each relay resonator is equal to the mutual induction of induction coils of the two access resonators adjacent to the relay resonator. At least one relay resonator is arranged around each access resonator adjacently. The inversion alternating voltage source and the loads are connected with the access resonators through the access end of a convertor K. The magnetic coupling resonant mode multi-load wireless power tree-type transmission network with the load isolating characteristic is simple in structure, easy to implement, convenient to control and easy to expand; the multiple loads can be charged by one inversion alternating voltage source at the same time, the loads are isolated well, the inversion alternating voltage source or the loads can achieve access through any access resonators, application is flexible, and the utilization rate of the resonators is improved greatly.
Description
Technical field
The invention belongs to radio energy transmission system design field.Relate to a kind of tree network structure of magnet coupled resonant type wireless transmission of electricity of multi-repeater multi-load.
Background technology
In recent years, wireless power transmission technology is widely used in the application such as household electrical appliance, medical treatment implantation, electric automobile because of its advantage such as convenient, safe, clean, is day by day subject to people's attention.The magnet coupled resonant type wireless electric energy transmission technology particularly grown up in recent years, because it is extensively concerned in advantages such as intermediate range distance high-efficient, non-radiative ground electric energy transmittings.
Traditional single transmit, single magnet coupled resonant type wireless electric energy transmission system received can only charge to single charging device at one time, and its transmission range, by the restriction of magnetic field near-field coupling, is no more than 2 ~ 3 times of coil bore usually.This significantly limit development and the application of wireless charging technology.
In order to overcome traditional magnet coupled resonant type wireless electric energy transmission technology transmission range short, can only the defect of single load charging, various countries experts and scholars have in succession carried out and utilize relay structure (as relaying resonator, Meta Materials dielectric-slab), expand many relay wireless electric energy force transfer technology of transmission range and the research of multi-load wireless charging technology.Many relayings and multi-load feature are organically merged, the magnetic field superposition utilizing multiple inductance coil being placed on different spatial to produce effectively covers in region among a small circle, load can carry out wireless charging by access network at any time in this region, apply suitable control method again, Here it is wireless power transmission local area network (LAN).But more existing multi-load many relay wireless charging techniques at present, there is poor, the mutual serious interference of isolation between load, controlling mechanism is complicated, the problems such as relaying resonator utilance is low, autgmentability is poor, are thus difficult to be used widely.
Summary of the invention
The object of the invention is to propose a kind of magnet coupled resonant type wireless electric energy tree transmis sion network network structure possessing many relayings multi-load of good autgmentability.Adopt K converter well to isolate multiple charging load, do not interfere with each other each other when ensureing that each load is charged; When charging load is by access point dynamic access or when disconnecting, very little to other load effect, thus need not complicated control circuit and controlling mechanism.
The present invention is achieved by the following technical solutions.
The present invention includes some relaying resonators (1), access resonator (2), an inversion alternating-current voltage source (3) and multiple load (4).Relaying resonator (1) around has and the access resonator (2) only having two to be close to, and the mutual inductance of two access resonator (2) inductance coils of relaying resonator (1) inductance coil and next-door neighbour is set to equal; The relaying resonator (1) that access resonator (2) has at least one to be close to around; Inversion alternating-current voltage source (3) and load (4) are then connected with access resonator by the incoming end (12) of K converter (11), are linked in this way in wireless power transmission network.
Mutual inductance between non-close resonator (access resonator and relaying resonator) belongs to the cross-couplings harmful to systematic function, should manage restriction or compensate.
Described relaying resonator (1) is in series by relaying air-core inductance (5) and relaying tuning capacitance (6), forms a LC resonant tank.In a network, relaying resonator (1) serves the function of radio energy relay transmission.
Described access resonator (2) comprises access air-core inductance (8), access tuning capacitance (9) and K converter (11).Air-core inductance (8) and tuning capacitance (9) are linked into one end of K converter (11) after connecting; The other end (12, incoming end) of K converter is used for accessing load (4) or inversion alternating-current voltage source (3), also can open a way and not access any load or power supply.Access resonator has two effects, and first is the effect playing the radio energy relay transmission the same with relaying resonator; Second is the access point as charging load and inverter voltage source.
Described K converter (11), also known as impedance transformer, plays a part load isolation in the structure.The mode of its available coupling inductance resonator structure realizes, as shown in Figure 2.Also can realize with other circuit structures such as T-shaped or Π type LC networks, as shown in Fig. 3 to Fig. 6, the value unification of inductance and electric capacity is
,
.
f 0for relaying resonator and the operating frequency accessing resonator.
Described air-core inductance turns to circle or rectangle usually, and its inductance value need not be identical with shape.
The resonance frequency of each resonator (relaying resonator and access resonator) is adjusted to operating frequency by described tuning capacitance
f 0.
The magnet coupled resonant type wireless delivery of electrical energy tree network structure of many relayings multi-load that the present invention proposes, structure is simple, easily implements, and it is convenient to control; Easy expansion is expanded, to reach the object of region overlay; Can charge to multiple load with an inversion alternating-current voltage source simultaneously; Have good isolation between load, do not interfere with each other during load charging, each load voltage amplitude equals supply voltage amplitude; Inversion alternating-current voltage source or load are linked in network by accessing arbitrarily resonator, very flexible in application; When load needs to add network easily during charging, do not need can open from network interruption at any time during charging, little to the interference of other charging load; Access resonator, except the function of radio energy relaying possessing relaying resonator, also simultaneously as the access point of charging load or inversion alternating-current voltage source, thus for multi-resmator radio energy transmission system, can substantially increase the devices use rate of resonator.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of tree-shaped many relayings multi-load wireless power transmission network configuration.Wherein, 1 is relaying resonator, and 2 is access resonators, and 3 is operating frequencies is
f 0inversion alternating-current voltage source, 4 is charging loads to be accessed, 5 is relaying air-core inductances of relaying resonator, 6 is relaying tuning capacitances, and 7 is the line loss resistance of relaying resonator, and 8 is access air-core inductances of access resonator, 9 is access tuning capacitances, 10 is the line loss resistance of access resonator, and 11 is K converters, and 12 is incoming ends of K converter.
Fig. 2 is the schematic diagram realizing K converter by inductance coil resonance coupled structure,
m 1
a it is access resonator coil
l 1with coupled resonators coil
l amutual inductance,
r a the line loss resistance of coupled resonators,
c a it is tuning capacitance.
m 1
a with
c a meet relation respectively
,
.
Fig. 3 is the schematic diagram realizing K converter with T-shaped lc circuit.Map parameter value:
,
.
Fig. 4 is the schematic diagram realizing K converter with Π type lc circuit.Map parameter value:
,
.
Fig. 5 is the schematic diagram realizing K converter with another kind of T-shaped lc circuit.Map parameter value:
,
.
Fig. 6 is the schematic diagram realizing K converter with another kind of Π type lc circuit.Map parameter value:
,
.
Fig. 7 is the circuit diagram of the tree-shaped three load wireless delivery of electrical energy networks of the y-bend described in the embodiment of the present invention.T-shaped lc circuit shown in K converter Fig. 5 realizes.
Fig. 8 is frequency (kHz) – voltage amplitude (V) curve chart of access point 1,2,3 each load end when connecing 10 Ω, 20 Ω, 25 Ω ohmic load respectively.
Fig. 9 is frequency (kHz) – efficiency (%) curve chart of Fig. 8.Operating frequency 225.0kHz, | V
1|=9.75V, | V
2|=9.60V, | V
3| during=9.63V, gross efficiency
η=94.6%.
Figure 10 is that access point 1 is opened a way (not connecing load), frequency (kHz) – voltage amplitude (V) curve chart of each load end when access point 2,3 connects 20 Ω, 25 Ω ohmic load respectively.
Figure 11 is frequency (kHz) – efficiency (%) curve chart of Figure 10.Operating frequency 225.0kHz, | V
2|=9.72V, | V
3| during=9.76V, gross efficiency
η=92.7%.
Figure 12 is that access point 2 is opened a way (not connecing load), frequency (kHz) – voltage amplitude (V) curve chart of each load end when access point 1,3 connects 10 Ω, 25 Ω ohmic load respectively.
Figure 13 is frequency (kHz) – efficiency (%) curve chart of Figure 12.Operating frequency 225.0kHz, | V
1|=9.82V, | V
3| during=9.69V, gross efficiency
η=94.8%.
Figure 14 is that access point 3 is opened a way (not connecing load), frequency (kHz) – voltage amplitude (V) curve chart of each load end when access point 1,2 connects 10 Ω, 20 Ω ohmic load respectively.
Figure 15 is frequency (kHz) – efficiency (%) curve chart of Figure 14.Operating frequency 225.0kHz, | V
1|=9.80V, | V
2| during=9.65V, gross efficiency
η=94.7%.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
Embodiment: the three load wireless delivery of electrical energy networks that y-bend is tree-shaped.
As shown in Figure 7.Inversion alternating-current voltage source V
soutput voltage amplitude 10V, frequency 225kHz.The coiling of each resonator air-core inductance is circular, and radius 10cm, forms around 10 circles by the enamel covered wire of linear diameter 1.5mm is close, its inductance
l 1=58.8 μ H, tuning capacitance
c 1=8.5nF, line loss resistance
r 1=0.12 Ω.Mutual inductance value between adjacent windings
m=7 μ H,
m'=4.5 μ H.T-shaped lc circuit shown in K converter Fig. 6 in each access resonator realizes,
kget 10 Ω.
Ignore cross-couplings, can be obtained by circuit simulation: when access point 1,2,3 connects 10 Ω, 20 Ω, 25 Ω ohmic load respectively, at operating frequency 225.0kHz, | V
1|=9.75V, | V
2|=9.60V, | V
3|=9.62V; Gross efficiency
η=94.6%.If access point 1 load is opened (access point 1 is opened a way) from network interruption, | V
2|=9.72V, | V
3|=9.76V, gross efficiency
η=92.7%.If access point 2 load is opened (access point 2 is opened a way) from network interruption, then | V
1|=9.82V, | V
3|=9.69V, gross efficiency
η=94.8%.If access point 3 load is opened (access point 3 is opened a way) from network interruption, | V
1|=9.80V, | V
2|=9.65V, gross efficiency
η=94.7%.Visible, each load voltage amplitude is roughly all 10V, when other access point has load to disconnect or accesses, other load voltage amplitude almost remains unchanged, therefore during each load charging, the power of pickup is subject to the interference of other access point load hardly and affects, and is only determined by supply voltage and the impedance of load own.
Ideally, each load access point pick-up voltage amplitude should be identical with supply voltage amplitude (being 10V in the present embodiment).But in actual applications, due to the existence of cross-couplings and loss resistance, the actual voltage value in load and theoretical value have deviation to a certain degree, adopt the resonator of high q-factor and reduce cross-linked measure and can effectively reduce this adverse effect.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (1)
1. there is the magnet coupled resonant type multi-load radio energy tree transmis sion network network of load isolation characteristic, it is characterized in that comprising some relaying resonators (1), access resonator (2), an inversion alternating-current voltage source (3) and multiple load (4); Relaying resonator (1) around has and the access resonator (2) only having two to be close to, and the mutual inductance of two access resonator (2) inductance coils of relaying resonator (1) inductance coil and next-door neighbour is set to equal; The relaying resonator (1) that access resonator (2) has at least one to be close to around; Inversion alternating-current voltage source (3) and load (4) are then connected with access resonator by the incoming end (12) of K converter (11);
Described relaying resonator (1) is in series by relaying air-core inductance (5) and relaying tuning capacitance (6), forms a LC resonant tank;
Described access resonator (2) comprises access air-core inductance (8), access tuning capacitance (9) and K converter (11); Air-core inductance (8) and tuning capacitance (9) are linked into one end of K converter (11) after connecting; The other end incoming end (12) of K converter is used for accessing load (4) or inversion alternating-current voltage source (3);
Coupling inductance resonator structure used by described K converter (11), or with T-shaped or Π type lc circuit, the value of inductance and electric capacity is
,
,
f 0for relaying resonator and the operating frequency accessing resonator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108667154A (en) * | 2018-05-21 | 2018-10-16 | 南昌大学 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
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Cited By (2)
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