CN106130191A - Wireless charging system coupling coil and preparation method thereof - Google Patents
Wireless charging system coupling coil and preparation method thereof Download PDFInfo
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- CN106130191A CN106130191A CN201610496337.5A CN201610496337A CN106130191A CN 106130191 A CN106130191 A CN 106130191A CN 201610496337 A CN201610496337 A CN 201610496337A CN 106130191 A CN106130191 A CN 106130191A
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- H02J7/025—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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Abstract
The invention provides a kind of wireless charging system coupling coil and preparation method thereof, including: step S1, the coefficient of coup that determines coupling coil；Step S2, according to the coefficient of coup, determine coupling coil inductance value and coupling coil operating current；Step S3, determine litz wire specification according to coupling coil operating current；Step S4, determine the coupling coil number of turn according to coupling coil inductance value.Wireless charging system coupling coil is designed the work breakdown of this complexity and becomes several step by the present invention, whole design process is clear, workable, the scheme designed by the present invention can meet technical specification, and by selecting optimization design scheme can realize higher electric energy efficiency of transmission.
Description
Technical field
The present invention relates to wireless charging technology, in particular it relates to a kind of wireless charging system coupling coil and preparation side thereof
Method.
Background technology
Wireless power transmission technology due to its conveniently, safely, the feature such as environmental protection, increasingly by weight in the life of people
Depending on.The aspects of contents such as this technology relate to Power Electronic Circuit, coil electromagnetism designs, automatically control, communication protocol.Close at present
Research in wireless charging is concentrated mainly on wireless charging circuit topology, control strategy and loop construction, about wireless charging
The research of the method for designing of system coupling coil is less.But coupling coil is as element most important in wireless charging system,
Not only closely related with electric energy through-put power and efficiency, and determine to a certain extent wireless charging device stability and can
By property.
In existing wireless charging system development process, the inductance value of the most empirically determined coil, then basis
The manual coiling of size limitation also constantly adjusts to the inductance value expected, parameter designing and coil winding are more of continuous based on experience
Attempt adjusting.But this method for designing cannot realize the optimum option of parameter, rule of thumb the coil of coiling may not necessarily be
System duty is mated thus is caused electric energy efficiency of transmission relatively low, thereby increases and it is possible to needs repeatedly to adjust thus causes the people of coil winding
Work cost and time cost increase, and affect system development process.Minority foreign literature have studied wireless charging system parameter optimization
Design cycle, but method for designing relates only to choosing of inductance value, is not involved with litz wire structure and the determination side of the number of turn
Method, does not the most design coil dimension, distance etc. intuitively and requires to include in the design process, so design process is imperfect,
Lose contact with reality and manufacture.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide a kind of wireless charging system coupling coil and system thereof
Preparation Method.
The preparation method of a kind of wireless charging system coupling coil according to present invention offer, including:
Step S1, determine the coefficient of coup of coupling coil；
Step S2, according to the coefficient of coup, determine transmitting coil inductance value L in coupling coil1, receiving coil in coupling coil
L2, transmitting coil operating current I in coupling coil1, receiving coil operating current I in coupling coil2；
Step S3, determine transmitting coil litz wire specification according to coupling coil transmitting coil operating current；According to coupling line
Circle receiving coil operating current determines receiving coil litz wire specification；
Step S4, according to transmitting coil inductance value, receiving coil inductance value in coupling coil, determine respectively in coupling coil
The transmitting coil number of turn, the receiving coil number of turn.
Preferably, described step S1 includes:
Step S11, selection and the combination of working environment immediate parameter in coefficient of coup reference table, by described closest
Parameter group be combined in the coefficient of coup reference table coefficient of coup of correspondence as the coefficient of coup of described coupling coil；
Wherein, the establishment step of described coefficient of coup reference table is: choose the different coupling coil size of many groups and charging
The parameter combination of distance, obtains coupling line under the parameter of different coil dimensions with charging distance combines by experiment or emulation
The coefficient of coup of circle.
Preferably, described step S2 includes:
Step S21, according to charge power P known to wireless charging systemout, charging current Iout, computational load resistance
Step S22, provide coupling coil transmitting coil inductance value L1, coupling coil receiving coil inductance value L2Initial value, meter
Calculate coupling coil mutual inductanceCoupling coil transmitting terminal internal resistance Rp=1000L1, coupling coil receiving terminal internal resistance Rs=
1000L2, coupling coil transmitting terminal equivalent resistanceTransmitting coil operating current in coupling coilU1
For the input voltage of wireless charging system, receiving coil voltage U in coupling coil2=2 π fMI1, receiving coil work in coupling coil
Make electric currentCharging current Iout=I2；F represents the operating frequency of coupling coil；K represents the coupled systemes of coupling coil
Number；
Step S23, by change L1And L2Value find charging current, transmitting coil operating current, receiving coil work electricity
Stream is satisfied by requiring and making object functionTake transmitting coil inductance value, receiving coil in the coupling coil of minima
Inductance value, and transmitting coil operating current and receiving coil operating current when calculating satisfied requirement.
Preferably, in step s3, for transmitting coil, receiving coil, determine that litz wire is advised the most as follows
Lattice, specifically include:
Step S31, calculating skin depthWith conductor total sectional area needed for coupling coilI=1,2；
Wherein, μ0For permeability of vacuum, σ is the electrical conductivity of conductor material, and f is the operating frequency of coupling coil；
Step S32, select single line line footpath less than the litz wire specification of 2 times of skin depths according to known litz wire specification；
Step S33, for the every kind of litz wire specification selected, choose some strands of litz wires, choosing of litz wire number of share of stock
Standard be the litz wire conductor total sectional area of this kind of litz wire specification more than conductor total sectional area A needed for described coupling coil
Little number of share of stock；
Step S34, obtain single line line footpath and number of share of stock is satisfied by the litz wire specification that requires.
Preferably, in step 4, for transmitting coil, receiving coil, the number of turn is determined the most as follows, specifically
Including:
Utilize following square coupling coil inductance value computing formula:
Determine and meet transmitting coil inductance value L respectively1, receiving coil L in coupling coil2Coupling coil number of turn N and coupling
Length of side di inside and outside coiln, outer length of side d of coupling coilout；
Wherein, μ0For permeability of vacuum.
Preferably, also include step 5, determine optimum preparation parameter；
Described step 5 includes:
Step S51, the single line line footpath of litz wire specification determined according to step S3, number of share of stock calculate the AC resistance of litz wire
Coefficient
Wherein,P is the number of plies, and the number of plies is that the number of share of stock of litz wire is opened root and rounded up and obtain；
Step S52, calculating coupling coil AC resistance Rac=Rdc*Fr*N*2*(din+dout)；
Wherein, Rdc is the D.C. resistance of known litz wire；N is the number of turn；
Step S53, scheme minimum for coupling coil AC resistance is defined as optimum preparation parameter.
Preferably, also include step 6, prepare coupling coil according to described optimum preparation parameter.
A kind of coupling coil provided according to the present invention, described coupling coil is according to above-mentioned wireless charging system coupling
The preparation method of coil obtains.
Compared with prior art, the present invention has a following beneficial effect:
1, the present invention sets up geometric parameter (coil dimension and charging distance) and systems technology parameter (inductance, coupled systemes
Number) contact so that coupling coil manufacture laminating reality, design threshold low, highly versatile.
2, the present invention considers high frequency Kelvin effect and approach effect, utilizes AC resistance rather than D.C. resistance more accurately
Estimating coil loss, design is more genuine and believable.
3, the present invention can provide optimum design side ensureing that wireless charging is reliable, stable, on the premise of safe operation
Case is weighed with weight to realize higher efficiency or efficiency.
4, the design process of the present invention is complete, and design result is concrete, prepares consistent with actual production, can directly instruct around
Coil processed, parts selection.
Accompanying drawing explanation
By the detailed description non-limiting example made with reference to the following drawings of reading, the further feature of the present invention,
Purpose and advantage will become more apparent upon:
The flow process of a kind of wireless charging system for electric automobile coupling coil method for designing that Fig. 1 provides for the embodiment of the present application
Figure；
Fig. 2 determines the flow chart of method for a kind of coil coefficient of coup that the embodiment of the present application provides；
Fig. 3 determines the flow chart of method for a kind of winding inductance quantity that the embodiment of the present application provides；
A kind of wireless charging system topology that Fig. 4 provides for the embodiment of the present application；
Fig. 5 determines the flow chart of method for a kind of litz wire model that the embodiment of the present application provides；
Fig. 6 determines the flow chart of method for a kind of coil turn that the embodiment of the present application provides；
A kind of square coil structure that Fig. 7 provides for the embodiment of the present application；
Fig. 8 determines the flow chart of method for a kind of optimization design scheme that the embodiment of the present application provides.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in the technology of this area
Personnel are further appreciated by the present invention, but limit the present invention the most in any form.It should be pointed out that, the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, it is also possible to make some changes and improvements.These broadly fall into the present invention
Protection domain.
The invention provides the preparation method of a kind of wireless charging system coupling coil, including: the coil coefficient of coup is really
Determine step, the determination step of winding inductance quantity, the determination step of litz wire model, the determination step of coil turn, optimal design
The determination step of scheme.Coupling coil includes transmitting terminal and receiving terminal, transmitting terminal i.e. transmitting coil, receiving terminal i.e. receiving coil.
Wireless charging system coupling coil is designed the work breakdown of this complexity and becomes 5 steps, whole design by the present invention
Process is clear, workable, and the scheme designed by the present invention can meet technical specification, and by selecting optimum
Design can realize higher electric energy efficiency of transmission.
With reference to shown in Fig. 1, a kind of wireless charging system for electric automobile coupling coil preparation method provided for the present embodiment
Flow chart, wherein, the preparation method of wireless charging system coupling coil includes:
Step S1, determine the coefficient of coup of coil；
Wherein, the coefficient of coup of coil is determined according to coil dimension and charging distance；
Step S2, determine the inductance value of coil；
Wherein, the coefficient of coup determined according to technical specification and step S1 of wireless charging system, determine winding inductance quantity
And operating current；
Step S3, determine litz wire model；
Wherein, the operating current provided according to operating frequency and step S2 determines profit from the litz wire specification that producer provides
Hereby line style number；
Step S4, determine the number of turn of coil；
Wherein, the litz wire model that the inductance value that determines according to coil dimension, step S2, step S3 provide determines coil
The number of turn；
Step S5, determine optimization design scheme；
Wherein, calculate and compare the AC resistance of different schemes lower coil, select the minimum optimization design scheme of internal resistance with
Improve wireless charging system electric energy efficiency of transmission.
With reference to shown in Fig. 2, described step S1 includes:
Step S11, determine square coil dimensional standard reference value (mm): 350,400,450,500,550,600；Determine away from
From standard reference value (mm): 150,175,200,225,250；
Step S12, utilize finite element emulation software analyze different size coil combination and apart under the coefficient of coup (acquiescence
Transmitting coil size is relatively big, 105 groups of data altogether)；Wherein, finite element emulation software can use the exploitation of JSOL company of Japan
Electromagnetic software JMAG；
Step S13, data compilation is become Excel form；
Step S14, select immediate one group of standard reference value according to the coil dimension specified and charging distance, determine coupling
Syzygy number.
With reference to shown in Fig. 3, described step S2 includes:
Step S21, determine wireless charging system topology, with reference to Fig. 4, according to charge power known to wireless charging system
Pout, charging current Iout, computational load resistance
Step S22, provide coupling coil transmitting terminal inductance value L1, coupling coil receiving terminal inductance value L2Initial value, calculate coupling
Close coil mutual inductanceCoupling coil transmitting terminal internal resistance Rp=1000L1, coupling coil receiving terminal internal resistance Rs=
1000L2, coupling coil transmitting terminal equivalent resistanceTransmitting coil electric current in coupling coilU1 is nothing
The input voltage of line charging system, receiving coil voltage U in coupling coil2=2 π fMI1, receiving coil electric current in coupling coilCharging current Iout=I2；F represents the operating frequency of coupling coil；K represents the coefficient of coup of coupling coil；
Step S23, by change L1And L2Value find charging current, transmitting coil electric current, receiving coil electric current are satisfied by
Require and make object functionTake the coupling coil inductance value of minima, and transmitting coil electricity when calculating satisfied requirement
Stream and receiving coil electric current are as coupling coil operating current, and wherein, coupling coil inductance value refers to coupling coil transmitting terminal electricity
Sensibility reciprocal L1, coupling coil receiving terminal inductance value L2。
Step 2 essence is the optimization of band Prescribed Properties, can be by by Mathematical software such as Matlab
Carry out.
With reference to shown in Fig. 5, described step S3 includes:
Step S31, provide operating frequency f and coil working electric current Ii(step S2 determines, for transmitting coil, and its work
Electric current is I1, it is I for its operating current of receiving coil2), calculate skin depthWith required conductor total sectional area
A(mm2)I=1,2, the corresponding transmitting coil of subscript 1, the corresponding receiving coil of subscript 2；
Wherein, μ0For permeability of vacuum, σ is the electrical conductivity of conductor material, and f is operating frequency.
Step S32, the litz wire specification provided according to producer select single line line footpath less than the litz wire of 2 times of skin depths；
Step S33, meeting from every kind and select the litz wire of suitable number of share of stock the line footpath required, the standard that number of share of stock determines is profit
The hereby line conductor total sectional area minimum number of share of stock more than A；
Step S34, determine single line line footpath and number of share of stock be satisfied by require litz wire specification.
With reference to shown in Fig. 6, described step S4 includes:
Step S41, data according to finite element simulation determine square coupling coil inductance value Li (for transmitting coil, its
Inductance value is L1, it is L for its inductance value of receiving coil2) computing formula
Wherein,din=dout-n*d, din、doutBe respectively coupling coil the interior length of side,
The outer length of side, is the coupling coil number of turn with reference to Fig. 7, N, and d is the diameter of litz wire.
Step S42, the coupling coil transmitting terminal inductance value L determined according to step S21, coupling coil receiving terminal inductance value L2,
Utilize square coupling coil inductance value computing formula, determine coupling coil number of turn N and the coupling line meeting coupling coil inductance value
Inside and outside length of side di of circlen, outer length of side d of coupling coilout。
With reference to shown in Fig. 8, described step S5 includes:
Step S51, the single line line footpath of litz wire specification determined according to step S3, number of share of stock calculate the AC resistance of litz wire
Coefficient
Wherein,P is the number of plies, and the number of plies is that the number of share of stock of litz wire is opened root and rounded up and obtain；If number of share of stock is 120 correspondences
The number of plies be 11.
The AC resistance that step S52, the D.C. resistance Rdc of litz wire according to producer's offer, number of turn N, step S51 determine
Inside and outside length of side di that coefficient Fr and step S4 determinen、doutCalculate the AC resistance R of coilac=Rdc*Fr*N*2*(din+
dout)；
Step S53, select the minimum scheme of coil AC resistance as optimization design scheme to realize greater efficiency.
The present invention also provides for a kind of according to the steps flow chart system in the preparation method of described wireless charging system coupling coil
The standby coupling coil obtained.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make a variety of changes within the scope of the claims or revise, this not shadow
Ring the flesh and blood of the present invention.In the case of not conflicting, the feature in embodiments herein and embodiment can any phase
Combination mutually.
Claims (8)
1. the preparation method of a wireless charging system coupling coil, it is characterised in that including:
Step S1, determine the coefficient of coup of coupling coil；
Step S2, according to the coefficient of coup, determine transmitting coil inductance value L in coupling coil1, receiving coil L in coupling coil2, coupling
Transmitting coil operating current I in zygonema circle1, receiving coil operating current I in coupling coil2；
Step S3, determine transmitting coil litz wire specification according to coupling coil transmitting coil operating current；Connect according to coupling coil
Take-up circle operating current determines receiving coil litz wire specification；
Step S4, according to transmitting coil inductance value, receiving coil inductance value in coupling coil, determine respectively in coupling coil launch
Coil turn, the receiving coil number of turn.
The preparation method of wireless charging system coupling coil the most according to claim 1, it is characterised in that described step S1
Including:
Step S11, selection and the combination of working environment immediate parameter in coefficient of coup reference table, by described immediate ginseng
Array is combined in the coefficient of coup reference table coefficient of coup coefficient of coup as described coupling coil of correspondence；
Wherein, the establishment step of described coefficient of coup reference table is: choose the different coupling coil size of many groups and charging distance
Parameter combination, obtain coupling coil under the parameter of different coil dimensions and charging distance combines by experiment or emulation
The coefficient of coup.
The preparation method of wireless charging system coupling coil the most according to claim 1, it is characterised in that described step S2
Including:
Step S21, according to charge power P known to wireless charging systemout, charging current Iout, computational load resistance
Step S22, provide coupling coil transmitting coil inductance value L1, coupling coil receiving coil inductance value L2Initial value, calculate coupling
Close coil mutual inductanceCoupling coil transmitting terminal internal resistance Rp=1000L1, coupling coil receiving terminal internal resistance Rs=
1000L2, coupling coil transmitting terminal equivalent resistanceTransmitting coil operating current in coupling coilU1
For the input voltage of wireless charging system, receiving coil voltage U in coupling coil2=2 π fMI1, receiving coil work in coupling coil
Make electric currentCharging current Iout=I2；F represents the operating frequency of coupling coil；K represents the coupled systemes of coupling coil
Number；
Step S23, by change L1And L2Value to find charging current, transmitting coil operating current, receiving coil operating current equal
Meet and require and make object functionTake transmitting coil inductance value in the coupling coil of minima, receiving coil inductance
Amount, and transmitting coil operating current and receiving coil operating current when calculating satisfied requirement.
The preparation method of wireless charging system coupling coil the most according to claim 1, it is characterised in that in step S3
In, for transmitting coil, receiving coil, determine litz wire specification the most as follows, specifically include:
Step S31, calculating skin depthWith conductor total sectional area needed for coupling coilI=1,2；
Wherein, μ0For permeability of vacuum, σ is the electrical conductivity of conductor material, and f is the operating frequency of coupling coil；
Step S32, select single line line footpath less than the litz wire specification of 2 times of skin depths according to known litz wire specification；
Step S33, for the every kind of litz wire specification selected, choose some strands of litz wires, the selection standard of litz wire number of share of stock
For the litz wire conductor total sectional area of this kind of litz wire specification more than the shallow bid of conductor total sectional area A needed for described coupling coil
Number；
Step S34, obtain single line line footpath and number of share of stock is satisfied by the litz wire specification that requires.
The preparation method of wireless charging system coupling coil the most according to claim 1, it is characterised in that in step 4,
For transmitting coil, receiving coil, determine the number of turn the most as follows, specifically include:
Utilize following square coupling coil inductance value computing formula:
din=dout-n*d
Determine and meet transmitting coil inductance value L respectively1, receiving coil L in coupling coil2Coupling coil number of turn N and coupling coil
Inside and outside length of side din, outer length of side d of coupling coilout；
Wherein, μ0For permeability of vacuum.
The preparation method of wireless charging system coupling coil the most according to claim 5, it is characterised in that also include step
5, optimum preparation parameter is determined；
Described step 5 includes:
Step S51, the single line line footpath of litz wire specification determined according to step S3, number of share of stock calculate the AC resistance coefficient of litz wire
Wherein,P is the number of plies, and the number of plies is that the number of share of stock of litz wire is opened root and rounded up and obtain；
Step S52, calculating coupling coil AC resistance Rac=Rdc*Fr*N*2*(din+dout)；
Wherein, Rdc is the D.C. resistance of known litz wire；N is the number of turn；
Step S53, scheme minimum for coupling coil AC resistance is defined as optimum preparation parameter.
The preparation method of wireless charging system coupling coil the most according to claim 6, it is characterised in that also include step
6, coupling coil is prepared according to described optimum preparation parameter.
8. a coupling coil, it is characterised in that described coupling coil is according to claim any one of claim 1 to 7
The preparation method of described wireless charging system coupling coil obtains.
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Cited By (12)
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|---|---|---|---|---|
| CN107069994A (en) * | 2017-04-24 | 2017-08-18 | 东华大学 | A kind of method for lifting wireless charging transmission range and efficiency of transmission |
| CN107093929A (en) * | 2017-03-24 | 2017-08-25 | 哈尔滨工业大学深圳研究生院 | Coupled resonance formula underwater wireless charging device and method |
| CN107766669A (en) * | 2017-11-01 | 2018-03-06 | 清华大学 | A kind of Wireless charging coil self-induction and the unit for electrical property parameters computational methods of mutual inductance |
| WO2018171473A1 (en) * | 2017-03-22 | 2018-09-27 | 成都市易冲无线科技有限公司 | Magnetic coil having spaced wire arrangement for wireless charging system |
| CN109067015A (en) * | 2018-09-26 | 2018-12-21 | 上海楚山电子科技有限公司 | A kind of wireless power transmission method of self-adapting changeable receiving coil |
| CN109255174A (en) * | 2018-08-31 | 2019-01-22 | 桂林电子科技大学 | Magnet coupled resonant type wireless energy transmission coil simulating analysis |
| CN109616261A (en) * | 2018-12-27 | 2019-04-12 | 哈尔滨工业大学 | The preparation method of litz wire suitable for high frequency magnetic coupling type wireless charging system |
| CN109733217A (en) * | 2018-12-03 | 2019-05-10 | 东南大学 | A kind of electric car wireless charging resonance coil and its design method |
| CN109992739A (en) * | 2019-02-25 | 2019-07-09 | 华北电力大学 | The optimal sub-thread diameter of rectangular litz wire and number of share of stock calculation method under non-sinusoidal current waveform stimulus |
| CN111439142A (en) * | 2020-05-26 | 2020-07-24 | 中国人民解放军火箭军工程大学 | Electromagnetic resonance coupling type wireless charging efficiency optimization method suitable for unmanned aerial vehicle |
| CN114050046A (en) * | 2021-11-25 | 2022-02-15 | 福州大学 | Method for designing wire gauge of wireless power transmission coil with double wire widths |
| CN114334338A (en) * | 2022-01-12 | 2022-04-12 | 桔充充(杭州)新能源有限公司 | Optimal design method for wireless charging coil of two-wheeled light-load electric vehicle |
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