CN106981933A - Radio energy transmission system and based on apart from adaptive driving coil collocation method - Google Patents
Radio energy transmission system and based on apart from adaptive driving coil collocation method Download PDFInfo
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Abstract
The present invention provides a kind of radio energy transmission system and based on apart from adaptive driving coil collocation method, is related to wireless power transmission technical field.System includes high-frequency drive power supply, driving coil group, transmitting coil, receiving coil and loading coil group, driving coil group includes non-coaxial structure and in conplane n parallel drive coil, loading coil group and driving coil group are full symmetric, and transmitting coil is full symmetric with receiving coil.Based on the system, it is determined that the condition that the transmission of system maximal efficiency is met under different transmission ranges, and the Implicitly function of driving coil radius is converted into, try to achieve optimum radius, inductance and series compensation capacitance.The radio energy transmission system of the present invention uses non-coaxial driving coil group, realize the portability of wireless electric energy transmission device, effectively reduction system loss, based on can be when transmission range changes apart from adaptive driving coil collocation method, it is ensured that system still carries out wireless power transmission with maximal efficiency.
Description
Technical field
The present invention relates to wireless power transmission technical field, more particularly to a kind of radio energy transmission system and based on distance
Adaptive driving coil collocation method.
Background technology
In recent years, because traditional wire transmission system contact line is also easy to produce the protrusion that spark, conductor easily wear and tear problem, wirelessly
The research of electric energy transmission technology is increasingly valued by people, and the application of the technology is also from small type mobile devices to industry
Field is constantly widened.Massachusetts science and engineering scholar in 2007 realizes new breakthrough in wireless power transmission technology, finds magnetic coupling
Wireless power transmission distance and transimission power can be effectively improved by closing resonant mode technology, and successfully light 2 meters in an experiment
An outer power is 60 watts of bulb.Since then, to become domestic and foreign scholars wireless in medium and long distance for magnet coupled resonant type technology
The focus technology studied in electric energy transmission.
Due to the efficiency of transmission of the magnet coupled resonant type wireless electric energy transmission system of two coils adjust the distance it is more sensitive, it is domestic
Outer researcher further widens transmission range generally by the way of increase repeating coil, improves efficiency of transmission, common master
There are three-winding and four loop constructions.No matter but which kind of structure, when transmission range changes, couple and also can between coil
Change, make system frequency of occurrences separating phenomenon, and under the appearance of frequency splitting phenomenon can make the efficiency of transmission of system drastically
Drop.
The content of the invention
For the defect of prior art, the present invention provides a kind of radio energy transmission system and based on apart from adaptive drive
Moving winding collocation method, uses the four loop radio energy Transmission systems and driving coil group of symmetrical expression to use non-coaxial knot
Structure, realizes the portability of wireless electric energy transmission device, effectively reduces system loss, based on apart from adaptive driving coil configuration
Method can be when transmission range changes, it is ensured that system still carries out wireless power transmission with maximal efficiency, greatly improves
System effectiveness.
On the one hand, the present invention provides a kind of radio energy transmission system, is non-coaxial four coils magnet coupled resonant type system,
Including high-frequency drive power supply, driving coil group, transmitting coil, receiving coil and loading coil group；The high-frequency drive power supply with
Driving coil group drive circuit loop in series；The two ends of the loading coil group are with needing the load of electricity consumption to connect and compose load
Circuit loop；The transmitting coil and receiving coil successively independence and be coaxially disposed in driving coil group and loading coil group it
Between, transmitting coil is full symmetric with receiving coil；Driving coil group includes n driving coil in parallel, and loading coil group includes n
Individual loading coil in parallel, loading coil group and driving coil group are full symmetric；The driving coil, transmitting coil, reception line
Circle and loading coil include inductance coil in inductance coil and series compensation capacitance, the driving coil group and loading coil group
One end be connected to a bit, the other end is connected corresponding series compensation capacitance respectively；High-frequency drive power supply and driving coil group it
Between, loading coil group and need electricity consumption load between connected by selecting switch, it is ensured that the driving coil in driving coil group
It is selectively turned on according to transmission range, loading coil is symmetrical to be connected；N driving coil is non-coaxial structure and put down same
Face；N loading coil is for non-coaxial structure and in same plane, and n specific value carries out configuring really according to maximum transmission distance
It is fixed.
On the other hand, the present invention also provides a kind of based on apart from adaptive radio energy transmission system driving coil configuration
Method, this method is based on above-mentioned non-coaxial four coils magnet coupled resonant type wireless electric energy transmission system, and calculating this is
The efficiency of transmission expression formula of system, and the bar that the coefficient of coup and coil q should be met when drawing the transmission of system maximal efficiency
Part, by the way that the condition to be converted into the Implicitly function relevant with driving coil radius, tries to achieve the optimum radius of driving coil, and then
The inductance and series compensation capacitance of driving coil are determined, the configuration of a driving coil is completed, loading coil is joined with driving coil
Number is completely the same；Then change the transmission range between transmitting coil and receiving coil, still method described above configure one it is new
Driving coil；Change the transmission range between transmitting coil and receiving coil again, then method described above is reconfigured at a new drive
Moving winding；So circulation, until configuring n driving coil, completes whole configurations of driving coil group；When system is carried out wirelessly
When electric energy is transmitted, according to actual transmission range, select its radius, inductance and series compensation capacitance full in n driving coil
The driving coil conducting of sufficient maximum transmitted efficiency term, the state for making system and being transmitted all the time with maximal efficiency carries out radio energy biography
It is defeated.
Further, the changing into for transmission range between the transmitting coil and receiving coil is changed with equal increments,
Incremental change is that the distance between two neighboring transmission range difference isWherein D is maximum transmission distance, i.e., according to reality
Ultimate range between the transmitting coil and receiving coil of term restriction, each transmission range in configuration is di=i Δs d, i=
1,2 ..., n.
Further, based on trying to achieve driving coil optimum radius, inductance in adaptive driving coil collocation method
With comprising the following steps that for series compensation capacitance：
Step 1：Set the basic parameter of radio energy transmission system, and loop initialization variable i=1；High frequency is set to drive
The angular frequency in dynamic source is ω0, driving coil, transmitting coil, receiving coil and the loading coil of system are satisfied by this angular frequency
Lower generation resonance；System transmitting coil is identical with the inductance of receiving coil, resistance, quality factor and series compensation capacitance difference,
That is Lt=Lr、Rt=Rr、Qt=Qr、Ct=Cr；The inductance parameters of transmitting coil and receiving coil are manually set, driving coil and negative
The inductance parameters of coil are carried as obtained by calculating, the inductance of driving coil and loading coil, series compensation capacitance, resistance, quality
Factor distinguishes identical, i.e. Ldi=Lli、Rdi=Rli、Cdi=Cli、Qdi=Qli, i=1,2 ..., n；All coils are used in system
Coiling radius all same, be designated as a；
Step 2：When the transmission range between transmitting coil and receiving coil is diWhen, determine radio energy transmission system
Shown in efficiency of transmission expression formula such as formula (1)；
Wherein, kdit、ktrThe coefficient of coup, transmitting coil and the reception line between driving coil and transmitting coil are represented respectively
The coefficient of coup between circle；
Step 3：Efficiency of transmission expression formula (1) is carried out to seek local derviationIt is determined that radio when making efficiency of transmission maximum
The condition that energy Transmission system should be met is formula (2)；
Step 4：The mutual inductance M between transmitting coil and receiving coil is calculated by mutual inductance calculation formulatr, mutual inductance calculates public
Shown in formula such as formula (3)；
Wherein, μ0For space permeability, numerical value is 4 π × 10-7；rtIt is the radius of transmitting coil, rrIt is the half of receiving coil
Footpath；D is the distance of transmitting coil and receiving coil lateral shift (between central shaft)；k2=4 α V ((1+ α V)2+β2)-1, wherein α
=rrrt -1, β=dirt -1,diBetween the plane where transmitting coil and receiving coil away from
From, namely the transmission range between transmitting coil and receiving coil；Ψ (k)=(1-k2/ 2) K (k)-E (k), K (k) and E (k) points
It is not elliptic integral of the first kind and elliptic integral of the second kind,
Step 5：According to transmitting coil inductance Lt, receiving coil inductance LrMutual inductance between transmitting coil and receiving coil
Mtr, determine the coefficient of coup k between transmitting coil and receiving coiltr, shown in calculation formula such as formula (4)；
Step 6：The radius of driving coil is set as rdi, in the case where being determined apart from constant, transmitting coil, according to mutual inductance
Calculation formula (5) and the calculation formula (6) of the coefficient of coup determine coefficient of coup k between driving coil and transmitting coilditWith
Driving coil radius rdiImplicit function relation；
Wherein, rtIt is the radius of transmitting coil；D ' is driving coil and transmitting coil lateral shift (between central shaft)
Distance；k′2=4 α ' V ' ((1+ α ' V ')2+β′2)-1, wherein α '=rtrdi -1, β '=crdi -1, V '=(1+d '2rt -2-2d′rt - 1cosφ)1/2, c is the distance between plane where driving coil and transmitting coil；
Step 7：The inductance L of driving coildiWith radius rdiThere is following relation,
Ldi=μ0rdi[ln(8rdi/a)-1.75] (7)
Then the quality factor of driving coil are Qdi=ω0Ldi/Rdi, it is driving coil radius rdiFunction；
According to the efficiency of transmission conditional (2) that radio energy transmission system is met when maximum, it is determined that unique driving coil
Radius rdi；
Step 8：According to the driving coil radius r determined in step 7diWith formula (7), the inductance L of driving coil is determineddi；Root
According to resonant frequency equationDetermine driving coil series compensation capacitance Cdi, now system is wireless with maximal efficiency progress
Electric energy is transmitted；
Step 9：Judge whether cyclic variable i is equal to n, if so, then step terminates, complete the configuration of driving coil；If it is not,
Then i=i+1, makes transmission range equal increments once, return to step 2, it is determined that new driving coil radius, inductance and series compensation
Electric capacity.
As shown from the above technical solution, the beneficial effects of the present invention are：A kind of wireless power transmission that the present invention is provided
System and based on apart from adaptive driving coil collocation method, the driving coil group of radio energy transmission system is using non-coaxial
Structure, n driving coil all in same plane, can be substantially reduced the transmitting terminal volume of radio energy transmission system, realize
The portability of wireless electric energy transmission device, and connecting line long between driving power supply and driving coil can be prevented effectively from, effectively
Reduce system loss；Based on non-coaxial four coils magnet coupled resonant type wireless electric energy transmission system, distance is realized with system
Adaptive maximal efficiency wireless power transmission is target, passes through n drives line of the driving coil collocation method to driving coil group
Circle is configured, and realizes the maximal efficiency transmission of radio energy, when transmission range changes, still ensures that radio energy is passed
Defeated system carries out wireless power transmission with maximal efficiency, substantially increases system effectiveness, solves well when transmission range hair
The problem that the efficiency of transmission of radio energy transmission system drastically declines during changing is middle apart from radio energy transmission system realization
There is provided and clearly instruct apart from adaptive maximal efficiency transmission.
Brief description of the drawings
Fig. 1 is radio energy transmission system structural topology figure provided in an embodiment of the present invention；
Fig. 2 is Fig. 1 equivalent circuit diagram；
Fig. 3 is provided in an embodiment of the present invention based on apart from adaptive driving coil collocation method flow chart；
Fig. 4 is the relation curve of radio energy transmission system efficiency of transmission provided in an embodiment of the present invention and transmission range
Figure.
In figure：1st, high-frequency drive power supply；2nd, driving coil group；3rd, transmitting coil；4th, receiving coil；5th, loading coil group；
6th, load；7th, drive circuit；8th, radiating circuit；9th, receiving circuit；10th, load circuit；11st, selecting switch.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
A kind of radio energy transmission system, is non-coaxial four coils magnet coupled resonant type system, including high-frequency drive power supply
1st, driving coil group 2, transmitting coil 3, receiving coil 4 and loading coil group 5.High-frequency drive power supply 1 is connected with driving coil group 2
Drive circuit loop is constituted, the two ends of loading coil group 5 are with needing the load 6 of electricity consumption to connect and compose load circuit loop；Emission lines
Circle 3 and receiving coil 4 independence and are coaxially disposed between driving coil group 2 and loading coil group 5 successively, and transmitting coil 3 is with connecing
Take-up circle 4 is full symmetric.Driving coil group 2 includes n driving coil in parallel, and loading coil group 5 includes n load in parallel
Coil, loading coil group 5 and driving coil group 2 are full symmetric；Driving coil, transmitting coil, receiving coil and loading coil are equal
Including inductance coil and corresponding series compensation capacitance, one end connection of inductance coil in driving coil group 2 and loading coil group 5
In a bit, the other end is connected corresponding series compensation capacitance respectively, between high-frequency drive power supply 1 and driving coil group 2, load line
Connected between circle group 5 and the load 6 for needing electricity consumption by selecting switch 11, it is ensured that driving coil in driving coil group 2 according to
Transmission range is selectively turned on, and loading coil is symmetrical to be connected；N driving coil is for non-coaxial structure and in same plane；N
Loading coil is for non-coaxial structure and in same plane, and n specific value carries out configuration determination, this reality according to maximum transmission distance
Apply in example, maximum transmission distance is (i.e. due to the maximum between plane where the transmitting coil and receiving coil of physical condition restriction
Distance) it is 0.5m, the number n=4 of driving coil, the structural topology figure of the system is as shown in Figure 1.
It is illustrated in figure 2 the equivalent circuit diagram (n=4) of above-mentioned radio energy transmission system, including drive circuit 7, transmitting
Circuit 8, receiving circuit 9 and load circuit 10.Drive circuit 7 includes high-frequency drive power supply VSAnd its internal resistance RSIt is in parallel with 4 groups
CRL circuits, wherein Ldi(i=1,2,3,4) is the inductance of driving coil, Rdi(i=1,2,3,4) is electric for the parasitism of driving coil
Resistance, Cdi(i=1,2,3,4) is the series compensation capacitance of driving coil.Radiating circuit 8 includes the CRL circuits of one group of series connection, wherein
LtFor the inductance of transmitting coil, RtFor the dead resistance of transmitting coil, CtFor the series compensation capacitance of transmitting coil.Receiving circuit 9
Include the CRL circuits of one group of series connection, wherein LrFor the inductance of receiving coil, RrFor the dead resistance of receiving coil, CrTo receive line
The series compensation capacitance of circle.Load circuit 10 includes load resistance RLWith 4 groups of CRL circuits in parallel, wherein Lli(i=1,2,3,
4) it is the inductance of loading coil, Rli(i=1,2,3,4) is the dead resistance of loading coil, Cli(i=1,2,3,4) is load line
The series compensation capacitance of circle.
Based on above-mentioned non-coaxial four coils magnet coupled resonant type wireless electric energy transmission system, in order to realize system distance certainly
Maximal efficiency wireless power transmission is adapted to, the efficiency of transmission for solving the radio energy transmission system when transmission range changes is anxious
The problem that play declines, the present embodiment provides a kind of based on apart from adaptive driving coil collocation method, first calculates system
Wireless power transmission efficiency expression formula, and the condition that should meet of coefficient of coup when drawing the transmission of system maximal efficiency, by should
Condition is converted into the Implicitly function relevant with driving coil radius, tries to achieve the optimum radius of driving coil, and then determine drives line
The inductance and series compensation capacitance of circle, complete the configuration of a driving coil；Then equal increments change transmitting coil with receiving
Transmission range between coil, still method described above configure a new driving coil；Change transmitting coil and receiving coil again
Between transmission range, then method described above is reconfigured at a new driving coil；So circulation, until configuring n driving
Coil, completes whole configurations of driving coil group 2.Wherein, the transmission range equal increments between transmitting coil and receiving coil
Incremental change during change is that the distance between two neighboring transmission range difference isWherein D is maximum transmission distance, is matched somebody with somebody
Each transmission range for putting middle change is di=i Δs d, i=1,2 ..., n.In the present embodiment, according to maximum transmission distance 0.5m,
Transmission range incremental change is 0.1m, changes four transmission ranges, so as to configure 4 driving coils.In specific implementation, transmitting coil
The change of transmission range between receiving coil can also be that equivalent is successively decreased change, and its configuration result changes with equal increments
Configuration result is the same, can also be manually set transmission distance in configuration according to actual maximum transmission distance and physical condition
From the rule of change.Loading coil and driving coil parameter are completely the same, and loading coil follows driving coil to change.Such as Fig. 3
It is shown, driving coil configuration specific method it is as follows.
Step 1：Set the basic parameter of radio energy transmission system, and loop initialization variable i=1；High frequency is set to drive
The angular frequency in dynamic source is ω0, system drive coil, transmitting coil, receiving coil and loading coil are satisfied by issuing in this frequency
Raw resonance；All coils are identical using coiling in system, and coiling radius is a；System transmitting coil is completely right with receiving coil
Claim, driving coil group and load system coil group are full symmetric, therefore inductance, resistance, quality factor and the series connection of transmitting coil are mended
Repay electric capacity identical with the inductance of receiving coil, resistance, quality factor and series compensation capacitance difference, i.e. Lt=Lr、Rt=Rr、Qt=
Qr、Ct=Cr, inductance with load system coil of the inductance of driving coil, series compensation capacitance, resistance, quality factor, series compensation
Electric capacity, resistance, quality factor distinguish identical, i.e. Ldi=Lli、Rdi=Rli、Cdi=Cli、Qdi=Qli, i=1,2,3,4.Emission lines
Circle is manually set with receiving coil inductance parameters in design, and the inductance parameters of driving coil and loading coil are in the design process
As obtained by calculating, in the present embodiment, angular frequency0=2 π * 13.56MHz, coiling radius a=2.5mm, transmitting coil is with connecing
Receive coil inductance Lt=Lr=15.56uH.
According to resonant frequency equationThe series compensation capacitance for determining transmitting coil is
The series compensation capacitance of receiving coil isAccording to dead resistance calculation formulaIts
Middle σ and l represent copper cash electrical conductivity and coil overall length (length after being stretched) respectively, and the dead resistance for determining transmitting coil isThe dead resistance of receiving coil isCalculated according to quality factor
FormulaThe quality factor for determining transmitting coil areThe quality factor of receiving coil are
Step 2：When transmission range is diWhen (the distance between transmitting coil 3 and receiving coil 4), determine that radio energy is passed
The efficiency of transmission η of defeated system, shown in expression formula such as formula (1)；
Wherein, kdit、ktrThe coefficient of coup, transmitting coil and the reception line between driving coil and transmitting coil are represented respectively
The coefficient of coup between circle.In the present embodiment, transmission range is set first as d1=0.1m.
Step 3：Efficiency of transmission expression formula (1) is carried out to seek local derviationIt is determined that radio when making efficiency of transmission maximum
The condition that energy Transmission system should be met is formula (2)；
Only as coefficient of coup kdit、ktrAnd quality factor qdi、QtWhen meeting above formula relation, the transmission of system wireless electric energy
Efficiency is only maximum.
Step 4：The mutual inductance M between transmitting coil and receiving coil is calculated by mutual inductance calculation formulatr, mutual inductance calculates public
Shown in formula such as formula (3).
Wherein, μ0For space permeability, numerical value is 4 π × 10-7；rtIt is the radius of transmitting coil, rrIt is the half of receiving coil
Footpath；D is the distance of transmitting coil and receiving coil lateral shift (between central shaft)；k2=4 α V ((1+ α V)2+β2)-1, wherein α
=rrrt -1, β=dirt -1,diBetween the plane where transmitting coil and receiving coil away from
From, namely the transmission range between transmitting coil and receiving coil；Ψ (k)=(1-k2/ 2) K (k)-E (k), K (k) and E (k) points
It is not elliptic integral of the first kind and elliptic integral of the second kind,
φ and θ are to be not in integral sign, result of calculation.In the present embodiment, calculating is obtained between transmitting coil and receiving coil
Mutual inductance be Mtr=1.2450 μ H.
Step 5：According to transmitting coil inductance L in step 1t, receiving coil inductance LrWith the emission lines calculated in step 4
Mutual inductance M between circle and receiving coiltr, determine the coefficient of coup k between transmitting coil and receiving coiltr, calculation formula such as formula
(4) shown in.
In the present embodiment, it is k to calculate the coefficient of coup between transmitting coil and receiving coiltr=0.1281.
Step 6：The radius of driving coil is set as rdi, in the case where being determined apart from constant, transmitting coil, according to mutual inductance
Calculation formula (5) and the calculation formula (6) of the coefficient of coup determine coefficient of coup k between driving coil and transmitting coilditWith
Driving coil radius rdiImplicit function relation.
Wherein, rtIt is the radius of transmitting coil；D ' is driving coil and transmitting coil lateral shift (between central shaft)
Distance；k′2=4 α ' V ' ((1+ α ' V ')2+β′2)-1, wherein α '=rtrdi -1, β '=crdi -1, V '=(1+d '2rt -2-2d′rt - 1cosφ)1/2, c is the distance between plane where driving coil and transmitting coil, and in order to reduce transmitting terminal volume, c takes one
C=0.025m in smaller value, the present embodiment.
Step 7：The inductance L of driving coildiWith rdiThere is following relation,
Ldi=μ0rdi[ln(8rdi/a)-1.75] (7)
The then quality factor q of driving coildi=ω0Ldi/RdiIt is also driving coil radius rdiFunction；According to transmission effect
The conditional (2) that radio energy transmission system is met when rate is maximum, it is determined that the radius of unique driving coil.In the present embodiment,
When transmission range is d1During=0.1m, it is determined that driving coil radius be rd1=0.095m.
System maximal efficiency is transmitted to the condition that should be metIt is converted into one and driving coil radius rdi
Relevant Implicitly function, the radius r optimal by solvingdiReversely the inductance of driving coil is derived, and then obtain drives line
The series compensation capacitance of circle.
Step 8：According to the driving coil radius r determined in step 7diWith formula (7), driving coil inductance L is determineddi；According to
Resonant frequency equationDetermine driving coil series compensation capacitance Cdi.In the present embodiment, when transmission range is d1=
During 0.1m, it is determined that driving coil inductance be Ld1=2.245 μ H, driving coil series compensation capacitance is Cd1=61.363pF.System
System loading coil and driving coil parameter are completely the same, and now system carries out wireless power transmission with maximal efficiency.
Step 9：Judge whether cyclic variable i is equal to n, if so, then the configuration of driving coil is completed；If it is not, then i=i+1,
Make transmission range equal increments once, return to step 2, it is determined that new driving coil radius, inductance and series compensation capacitance.
In the present embodiment, transmission range is according to equal increments principle by d1=0.1m becomes d2During=0.2m, above-mentioned step is repeated
Rapid 2 arrive step 9, it is determined that new driving coil radius is rd2=0.075m, driving coil inductance Ld2=1.683 μ H and drives line
Enclose series compensation capacitance Cd2=81.853pF, loading coil follows driving coil to change, and system is still met maximal efficiency transmission
Condition.When transmission range becomes d again3During=0.3m, repeat the above steps 2 arrive step 9, it may be determined that new driving coil radius
For rd3=0.06m, driving coil inductance Ld3=1.279 μ H and driving coil series compensation capacitance Cd3=107.71pF, load line
Circle follows driving coil to change, and system is still met maximal efficiency transmission conditions.When transmission range becomes d again4During=0.4m, weight
Multiple above-mentioned steps 2 arrive step 8, it may be determined that new driving coil radius rd4=0.055m, driving coil inductance Ld4=1.084 μ
H and driving coil series compensation capacitance Cd4=127.08pF, loading coil follows driving coil to change, and system is still met maximum
Efficiency transmission condition.
In specific implementation, the corresponding solution procedure of each transmission range (step 2 to step 8) sequencing can not be limited
It is fixed, as long as the corresponding size of n driving coil and inductance, capacitance parameter are all determined, just complete configuration.
According to the efficiency of transmission for the different coil radius tried to achieve under all transmission ranges, draw and transmitted under different coil radius
The matched curve figure of distance and efficiency, as shown in figure 4, transmission range and transmission under the different coil radius obtained for the present embodiment
The matched curve figure of efficiency.When system carries out wireless power transmission, according to actual transmission range, in n driving coil
Select its radius, inductance and series compensation capacitance meet maximum transmitted efficiency term driving coil conducting, make system all the time with
The state of maximal efficiency transmission carries out wireless power transmission.In the present embodiment, when transmission range is changing within 0.5m, according to
The corresponding relation of the transmission range of this in curve map and four efficiency of transmission values, the corresponding coil of selection maximum of which efficiency of transmission
Radius, and then select the driving coil of the radius to turn on by selecting switch in 4 driving coils configured, now system
Energy transmission efficiency reaches maximum.Therefore, when transmission range constantly changes, by being transmitted under relatively more different coil radius
The magnitude relationship of distance and efficiency, it may be determined that in any transmission range, the maximum biography of efficiency is realized by switching coil
Defeated mode.
The present embodiment propose radio energy transmission system and its based on apart from adaptive driving coil collocation method energy
The problem that the efficiency of transmission of the radio energy transmission system when transmission range changes drastically declines is solved well, is wireless
Electric energy transmission technology is realized in the range of medium and long distance provides clearly guidance apart from the transmission of adaptive maximal efficiency.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in previous embodiment, or which part or all technical characteristic are equal
Replace；And these modifications or replacement, the essence of appropriate technical solution is departed from the model that the claims in the present invention are limited
Enclose.
Claims (4)
1. a kind of radio energy transmission system, it is characterised in that：The system is non-coaxial four coils magnet coupled resonant type system, bag
Include high-frequency drive power supply (1), driving coil group (2), transmitting coil (3), receiving coil (4) and loading coil group (5)；The height
Frequency driving power supply (1) and driving coil group (2) drive circuit loop in series；The two ends of the loading coil group (5) are with needing
The load of electricity consumption connects and composes load circuit loop；The transmitting coil (3) and receiving coil (4) independence and are coaxially disposed successively
Between driving coil group (2) and loading coil group (5), transmitting coil (3) and receiving coil (4) are full symmetric；Driving coil
Group (2) includes n driving coil in parallel, and loading coil group (5) includes the loading coil of n parallel connection, loading coil group (5) and
Driving coil group (2) is full symmetric；The driving coil, transmitting coil, receiving coil and loading coil include inductance coil
And series compensation capacitance, one end of inductance coil is connected to a bit in the driving coil group (2) and loading coil group (5), separately
One end is connected corresponding series compensation capacitance respectively；Between high-frequency drive power supply (1) and driving coil group (2), loading coil group
(5) with being connected between the load (6) for needing electricity consumption by selecting switch (11), it is ensured that the driving coil in driving coil group (2)
It is selectively turned on according to transmission range, loading coil is symmetrical to be connected；N driving coil is non-coaxial structure and put down same
Face；N loading coil is for non-coaxial structure and in same plane, and n specific value carries out configuring really according to maximum transmission distance
It is fixed.
2. it is a kind of based on apart from adaptive radio energy transmission system driving coil collocation method, for configuring claim 1
Driving coil in described radio energy transmission system, it is characterised in that：Calculate the transmission of the radio energy transmission system
Efficiency expression formula, and the condition that the coefficient of coup and coil q should be met when drawing the transmission of system maximal efficiency, by inciting somebody to action
The condition is converted into the Implicitly function relevant with driving coil radius, tries to achieve the optimum radius of driving coil, and then determine driving
The inductance and series compensation capacitance of coil, complete the configuration of a driving coil, loading coil and driving coil parameter complete one
Cause；Then the transmission range between transmitting coil and receiving coil is changed, still method described above configures a new driving coil；
Change the transmission range between transmitting coil and receiving coil again, then method described above is reconfigured at a new driving coil；Such as
This circulation, until configuring n driving coil, completes whole configurations of driving coil group；When system carries out wireless power transmission
When, according to actual transmission range, select its radius, inductance and series compensation capacitance to meet maximum pass in n driving coil
The driving coil conducting of defeated efficiency term, the state for making system and being transmitted all the time with maximal efficiency carries out wireless power transmission.
3. it is according to claim 2 based on apart from adaptive radio energy transmission system driving coil collocation method, its
It is characterised by：Changing into for transmission range between the transmitting coil and receiving coil is changed with equal increments, and incremental change is
The distance between two neighboring transmission range difference isWherein D is maximum transmission distance, i.e., limited according to physical condition
Transmitting coil and receiving coil between ultimate range, each transmission range in configuration is di=i Δ d, i=1,2 ...,
n。
4. it is according to claim 3 based on apart from adaptive radio energy transmission system driving coil collocation method, its
It is characterised by：The optimum radius for trying to achieve driving coil, and then determine the inductance of driving coil and the tool of series compensation capacitance
Body step is as follows：
Step 1：Set the basic parameter of radio energy transmission system, and loop initialization variable i=1；Set high frequency drive source
Angular frequency be ω0, driving coil, transmitting coil, receiving coil and the loading coil of system are satisfied by issuing in this angular frequency
Raw resonance；System transmitting coil is identical with the inductance of receiving coil, resistance, quality factor and series compensation capacitance difference, i.e. Lt
=Lr、Rt=Rr、Qt=Qr、Ct=Cr；The inductance parameters of transmitting coil and receiving coil are manually set, driving coil and load line
The inductance parameters of circle are as obtained by calculating, the inductance of driving coil and loading coil, series compensation capacitance, resistance, quality factor
Identical, the i.e. L of differencedi=Lli、Rdi=Rli、Cdi=Cli、Qdi=Qli, i=1,2 ..., n；In system all coils use around
Line radius all same, is designated as a；
Step 2：When the transmission range between transmitting coil and receiving coil is diWhen, determine the transmission of radio energy transmission system
Shown in efficiency expression formula such as formula (1)；
Wherein, kdit、ktrRepresent respectively the coefficient of coup, transmitting coil and receiving coil between driving coil and transmitting coil it
Between the coefficient of coup；
Step 3：Efficiency of transmission expression formula (1) is carried out to seek local derviationIt is determined that radio energy is passed when making efficiency of transmission maximum
The condition that defeated system should be met is formula (2)；
Step 4：The mutual inductance M between transmitting coil and receiving coil is calculated by mutual inductance calculation formulatr, mutual inductance calculation formula is such as
Shown in formula (3)；
Wherein, μ0For space permeability, numerical value is 4 π × 10-7；rtIt is the radius of transmitting coil, rrIt is the radius of receiving coil；d
For transmitting coil and the distance of receiving coil lateral shift (between central shaft)；k2=4 α V ((1+ α V)2+β2)-1, wherein α=
rrrt -1, β=dirt -1,diBetween the plane where transmitting coil and receiving coil away from
From, namely the transmission range between transmitting coil and receiving coil；Ψ (k)=(1-k2/ 2) K (k)-E (k), K (k) and E (k) points
It is not elliptic integral of the first kind and elliptic integral of the second kind,
Step 5：According to transmitting coil inductance Lt, receiving coil inductance LrMutual inductance M between transmitting coil and receiving coiltr, really
Determine the coefficient of coup k between transmitting coil and receiving coiltr, shown in calculation formula such as formula (4)；
Step 6：The radius of driving coil is set as rdi, in the case where being determined apart from constant, transmitting coil, according to the meter of mutual inductance
The calculation formula (6) of calculation formula (5) and the coefficient of coup determines the coefficient of coup k between driving coil and transmitting coilditWith driving
Coil radius rdiImplicit function relation；
Wherein, rtIt is the radius of transmitting coil；D ' is the distance of driving coil and transmitting coil lateral shift (between central shaft)；
k′2=4 α ' V ' ((1+ α ' V ')2+β′2)-1, wherein α '=rtrdi -1, β '=crdi -1, V '=(1+d '2rt -2-2d′rt -1cosφ
)1/2, c is the distance between plane where driving coil and transmitting coil；
Step 7：The inductance L of driving coildiWith radius rdiThere is following relation,
Ldi=μ0rdi[ln(8rdi/a)-1.75] (7)
Then the quality factor of driving coil are Qdi=ω0Ldi/Rdi, it is driving coil radius rdiFunction；
According to the efficiency of transmission conditional (2) that radio energy transmission system is met when maximum, it is determined that unique driving coil radius
rdi；
Step 8：According to the driving coil radius r determined in step 7diWith formula (7), the inductance L of driving coil is determineddi；According to humorous
Vibration frequency formulaDetermine driving coil series compensation capacitance Cdi, now system is with maximal efficiency progress radio energy
Transmission；
Step 9：Judge whether cyclic variable i is equal to n, if so, then step terminates, complete the configuration of driving coil；If it is not, then i
=i+1, makes transmission range equal increments once, return to step 2, it is determined that new driving coil radius, inductance and series compensation electricity
Hold.
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