CN110287608A - A kind of coil parameter optimization method for wireless charging - Google Patents
A kind of coil parameter optimization method for wireless charging Download PDFInfo
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Abstract
The invention discloses a kind of coil parameter optimization methods for wireless charging, first by the way that successively to each edge, every magnetic field strength is solved in space since the most interior circle coil of subcoil is to outermost turn coil, Distribution of Magnetic Field of the DD type coil in entire space is found out according to principle of stacking, then to entire coil institute, all the points carry out matrix operation in space, can obtain the Distribution of Magnetic Field situation of DD type coil each point in space；Then according to the Distribution of Magnetic Field situation of the DD type coil of acquisition each point in space, based on ant colony optimization algorithm, it is optimization foundation with the magnetic induction intensity superposition vector sum being emitted on receiving coil, optimization is carried out to parameter to be optimized, coil parameter optimization can be completed, calculation method of the present invention is simple, and the optimization design of DD type coil can be completed according to the above method, provides a kind of scientific, reliable optimization method for DD type coil.
Description
Technical field
The invention belongs to electric car wireless charging technical fields, and in particular to a kind of coil parameter for wireless charging
Optimization method.
Background technique
In electric vehicle wireless charging field, coil is the key element in wireless charging system for electric automobile, it determines
The power delivery capabilities of system and the efficiency of transmission are determined；And circular coil and magnetic flux tubing coil traditional at present has always
There are lower coupling coefficient, the flat offset characteristic of poor water resistant, and setting in the DD type coil of automobile wireless charging at present
Lack a science, reliable design method in meter, also the space magnetic field of DD type coil is not carried out in previous document
Modeling analysis mathematically.Solving magnetic induction intensityWhen, due to the size of the vector R by current elements pointing space certain point
Direction is unknown, is difficult to find out its original function when quadraturing for this complicated function.
Summary of the invention
The purpose of the present invention is to provide a kind of coil parameter optimization methods for wireless charging, to overcome the prior art
Deficiency.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of coil parameter optimization method for wireless charging, comprising the following steps:
Step 1), since the most interior circle coil of subcoil is to outermost turn coil successively to each edge every magnetic in space
Field intensity is solved, and Distribution of Magnetic Field of the DD type coil in entire space is found out according to principle of stacking, then to entire coil
All the points carry out matrix operation in space for institute, can obtain the Distribution of Magnetic Field situation of DD type coil each point in space；
Step 2) is based on ant colony optimization algorithm, is excellent with the magnetic induction intensity superposition vector sum being emitted on receiving coil
Change foundation, optimization is carried out to parameter to be optimized, one group of optimal design parameter is obtained, it is excellent that coil parameter can be completed
Change.
Further, space coordinates are established using two subcoil geometric centers in DD type coil as coordinate center, for
Magnetic induction intensity in coil at any P point, establishes the calculation formula of DD type coil Distribution of Magnetic Field:
In formula: BiP1、BiP2、BiP3、BiP4It is corresponding four sides of the i-th circle coil in a subcoil respectively in the magnetic of P point
Induction；μ0For space permeability；I is the size of electric current in coil；N is n-th of infinitesimal after each wire divides；N is
Each wire is divided into the total number of infinitesimal；(x, y, z) is the coordinate of P point in arbitrary point in space；(ai,bi),(ai,bi'),
(ai', bi'), (ai', bi) are the coordinate on corresponding four vertex of the i-th circle coil；
Magnetic induction intensity of the i-th each side of circle coil on observation point P (x, y, z) in one of subcoil in DD type coil
BiLAre as follows:
Bil=BiP1(x,y,z)+BiP2(x,y,z)+BiP3(x,y,z)+BiP4(x,y,z)
The i-th circle coil in another subcoil can similarly be found out in the magnetic induction density B of observation point Pir, former using superposition
Reason, can be obtained entire DD coil in the magnetic induction density B of P point:
B=Bil+Bir。
Further, to entire coil institute, all the points carry out matrix operation in space, can obtain DD coil in space
In each point magnetic induction intensity.
Further, parameter to be optimized includes the area S of transmitting coil, the number of turns z, length-width ratio k, turn-to-turn away from w and two
Spacing Gap between subcoil.
Further, the Distribution of Magnetic Field calculation formula based on ant colony optimization algorithm and DD coil, by parameter to be optimized
Be introduced into DD coil magnetic field distribution calculation formula in, be emitted on receiving coil magnetic induction intensity superposition vector sum for optimization according to
According to, optimization is carried out to parameter to be optimized, obtains one group of optimal design parameter.
Further, in step 2), parameter to be optimized is introduced into the magnetic field calculation formula of DD type coil, according to as follows
Formula:
Value is carried out to parameter to be optimized by state-transition matrix in ant group algorithm, by parallel computation mode,
Obtain magnetic induction intensity in receiving area superposition and, with this, with the reference value phase in the calculated result of per generation of front
Compare, is maximized as the reference value in next-generation calculate；After operation through excessive generation, magnetic in region can be received
One group of design parameter when field intensity maximum.
Further, i value is carried out to parameter to be optimized by state-transition matrix in ant group algorithm, i >=3,
By parallel computation mode, the superposition of magnetic induction intensity of the i value in receiving area is obtained respectively and is existed with i value
The superposition of magnetic induction intensity in receiving area and maximum value are reference, carry out i+1 time value, and calculate i+1 time value
The superposition of magnetic induction intensity in receiving area and；With the superposition of magnetic induction intensity of the i+1 value in receiving area and
Maximum value is reference, carries out next value, until the superposition of magnetic induction intensity of the value finally obtained in receiving area and
Less than threshold value, then last value is last design parameter, and coil parameter optimization can be completed.
Compared with prior art, the invention has the following beneficial technical effects:
A kind of coil parameter optimization method for wireless charging of the present invention, first by from the most interior circle coil of subcoil to
Outermost turn coil starts successively that every magnetic field strength solves in space to each edge, finds out DD type according to principle of stacking
Distribution of Magnetic Field of the coil in entire space, then to entire coil institute, all the points carry out matrix operation in space, can obtain
DD type coil each point in space Distribution of Magnetic Field situation；Then according to the DD type coil of acquisition each point in space
Distribution of Magnetic Field situation is based on ant colony optimization algorithm, is optimization with the magnetic induction intensity superposition vector sum being emitted on receiving coil
Foundation carries out optimization to parameter to be optimized, coil parameter optimization can be completed, calculation method of the present invention is simple, root
The optimization design of DD type coil can be completed according to the above method, provide a kind of scientific, reliable optimization method for DD type coil.
Further, by establishing the calculation formula of DD type coil Distribution of Magnetic Field, based on ant colony optimization algorithm to be optimized
The calculation formula of parameter combination DD type coil Distribution of Magnetic Field optimizes calculating, quickly can most be there is result.
Detailed description of the invention
Fig. 1 is DD type coil Distribution of Magnetic Field structural schematic diagram.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
A kind of coil parameter optimization method for wireless charging, comprising the following steps:
Step 1), since the most interior circle coil of subcoil is to outermost turn coil successively to each edge every magnetic in space
Field intensity is solved, and Distribution of Magnetic Field of the DD type coil in entire space is found out according to principle of stacking, then to entire coil
All the points carry out matrix operation in space for institute, can obtain the Distribution of Magnetic Field situation of DD type coil each point in space；
It is specific: in DD type coil Distribution of Magnetic Field structure, using two subcoil geometric centers in DD type coil as in coordinate
The heart establishes space coordinates, as shown in Figure 1, establishing DD type coil magnetic field point for the magnetic induction intensity at P point any in coil
The calculation formula of cloth:
In formula: BiP1、BiP2、BiP3、BiP4It is corresponding four sides of the i-th circle coil in a subcoil respectively in the magnetic of P point
Induction；μ0For space permeability；I is the size of electric current in coil；N is n-th of infinitesimal after each wire divides；N is
Each wire is divided into the total number of infinitesimal；(x, y, z) is the coordinate of P point in arbitrary point in space；(ai,bi),(ai,bi'),
(ai', bi'), (ai', bi) are the coordinate on corresponding four vertex of the i-th circle coil, specific as shown in Figure 1；
Magnetic induction intensity of the i-th each side of circle coil on observation point P (x, y, z) in one of subcoil in DD type coil
BiLAre as follows:
Bil=BiP1(x,y,z)+BiP2(x,y,z)+BiP3(x,y,z)+BiP4(x,y,z)
The i-th circle coil in another subcoil can similarly be found out in the magnetic induction density B of observation point Pir, former using superposition
Reason, can be obtained entire DD coil in the magnetic induction density B of P point:
B=Bil+Bir
To entire coil institute, all the points carry out matrix operation in space, can obtain DD coil each point in space
Magnetic induction intensity；In formula, B is total magnetic induction intensity of the DD type coil at P point；
Step 2), the Distribution of Magnetic Field calculation formula based on ant colony optimization algorithm and DD coil, parameter to be optimized is drawn
Enter DD coil magnetic field distribution calculation formula in, be emitted on receiving coil magnetic induction intensity superposition vector sum for optimization according to
According to, optimization is carried out to parameter to be optimized, obtains one group of optimal design parameter；
Coil design parameter includes the area S of transmitting coil, the number of turns z, length-width ratio k, turn-to-turn away between w and two subcoil
Spacing Gap；
Specifically, parameter to be optimized is introduced into the magnetic field calculation formula of DD type coil, the following formula of corresponding relationship:
Value is carried out to parameter to be optimized by state-transition matrix in ant group algorithm, by parallel computation mode,
Obtain magnetic induction intensity in receiving area superposition and, with this, with the reference value phase in the calculated result of per generation of front
Compare, is maximized as the reference value in next-generation calculate；After operation through excessive generation, magnetic in region can be received
One group of design parameter when field intensity maximum；
Specifically, carrying out i value to parameter to be optimized by state-transition matrix in ant group algorithm, i >=3 lead to
Parallel computation mode is crossed, the superposition of magnetic induction intensity of the i value in receiving area is obtained respectively and is being connect with i value
The superposition and maximum value for receiving the magnetic induction intensity in region are reference, carry out i+1 time value, and calculate i+1 time value and exist
The superposition of magnetic induction intensity in receiving area and；With the superposition of magnetic induction intensity of the i+1 value in receiving area and most
Big value is reference, carries out next value, until last value obtains the superposition of the magnetic induction intensity in receiving area and is less than
Threshold value, then last value is last design parameter, and coil parameter optimization can be completed.
The present invention is obtained in space by the calculation formula of DD type coil Distribution of Magnetic Field perpendicular to the magnetic induction in Y-axis plane
Intensity, the results are shown in Table 1 with the coil parameter for process optimization acquisition:
Table 1
Gap-DD is the spacing in DD coil between two subcoils in left and right, B in tablesum(T) plane where receiving coil
On magnetic induction intensity superposition and, BE(T) for receiving coil magnetic induction intensity in the plane mean value.Before optimization
Result afterwards can be seen that in the case where receiving coil is constant, emit after optimization to the B in receiving coil regionsumIt improves
9.2e+04T, the average value of magnetic induction intensity increases 4.16T in each grid division, and Gap-DD takes 0 at this time.I.e. in emission lines
In the case that circle area is constant, the design scheme after optimization has different length-width ratios compared to the design scheme before optimizationAnd
And bigger magnetic induction intensity can be provided in receiving coil region, Distribution of Magnetic Field is also more uniform.
So that in grid magnetic induction intensity stack result BsumWith the average value B of magnetic induction intensityENumerical value as far as possible
Close to highest point, in order to accurately obtain the design parameter of DD coil, the present invention is to the area S of DD type coil, length-width ratioThe calculation method of the several important parameters of clearance G ap-DD between two subcoils has carried out design again.This method
The optimal the number of turns of the coil and length-width ratio parameter can be calculated in the case where known transmitting coil size.Based on the party
Method can provide a kind of new design means for DD type coil in the different scenes of wireless charging.
Claims (7)
1. a kind of coil parameter optimization method for wireless charging, which comprises the following steps:
Step 1), since the most interior circle coil of subcoil is to outermost turn coil successively to each edge in space every magnetic field it is strong
Degree is solved, and finds out Distribution of Magnetic Field of the DD type coil in entire space according to principle of stacking, then to where entire coil
All the points carry out matrix operation in space, can obtain the Distribution of Magnetic Field situation of DD type coil each point in space；
Step 2), according to the Distribution of Magnetic Field situation of the DD type coil of acquisition each point in space, be based on ant colony optimization algorithm, with
The magnetic induction intensity superposition vector sum on receiving coil is emitted to as optimization foundation, parameter to be optimized optimize and is asked
Solution, obtains one group of optimal design parameter, and coil parameter optimization can be completed.
2. a kind of coil parameter optimization method for wireless charging according to claim 1, which is characterized in that with DD type
Two subcoil geometric centers are that space coordinates are established at coordinate center in coil, the magnetic induction in coil at any P point
Intensity establishes the calculation formula of DD type coil Distribution of Magnetic Field:
In formula: BiP1、BiP2、BiP3、BiP4It is corresponding four sides of the i-th circle coil in a subcoil respectively in the magnetic induction of P point
Intensity；μ0For space permeability；I is the size of electric current in coil；N is n-th of infinitesimal after each wire divides；N is every
Conducting wire is divided into the total number of infinitesimal；(x, y, z) is the coordinate of P point in arbitrary point in space；(ai,bi),(ai,bi'),(ai',
Bi'), (ai', bi) is the coordinate on corresponding four vertex of the i-th circle coil；
Magnetic induction density B of the i-th each side of circle coil on observation point P (x, y, z) in one of subcoil in DD type coiliL
Are as follows:
Bil=BiP1(x,y,z)+BiP2(x,y,z)+BiP3(x,y,z)+BiP4(x,y,z)
The i-th circle coil in another subcoil can similarly be found out in the magnetic induction density B of observation point Pir, using principle of stacking,
Entire DD coil can be obtained in the magnetic induction density B of P point:
B=Bil+Bir。
3. a kind of coil parameter optimization method for wireless charging according to claim 1, which is characterized in that entire
All the points carry out matrix operation in space for coil institute, can obtain the magnetic induction intensity of DD coil each point in space.
4. a kind of coil parameter optimization method for wireless charging according to claim 1, which is characterized in that be optimized
Parameter include the area S of transmitting coil, the number of turns z, length-width ratio k, turn-to-turn away from the spacing Gap between w and two subcoil.
5. a kind of coil parameter optimization method for wireless charging according to claim 4, which is characterized in that be based on ant
Parameter to be optimized is introduced the distribution of DD coil magnetic field and calculates public affairs by the Distribution of Magnetic Field calculation formula of colony optimization algorithm and DD coil
It is optimization foundation with the magnetic induction intensity superposition vector sum being emitted on receiving coil in formula, parameter to be optimized is carried out most
Optimization Solution obtains one group of optimal design parameter.
6. a kind of coil parameter optimization method for wireless charging according to claim 5, which is characterized in that step 2)
In, parameter to be optimized is introduced into the magnetic field calculation formula of DD type coil, according to the following formula:
Value is carried out to parameter to be optimized by state-transition matrix in ant group algorithm, by parallel computation mode, is obtained
The superposition of magnetic induction intensity in receiving area and, with this, compared with the reference value in the calculated result of per generation of front,
It is maximized as the reference value in next-generation calculate；After operation through excessive generation, it is strong to can be received magnetic field in region
One group of design parameter when degree is maximum.
7. a kind of coil parameter optimization method for wireless charging according to claim 6, which is characterized in that in ant colony
I value is carried out to parameter to be optimized by state-transition matrix in algorithm, i >=3 are obtained respectively by parallel computation mode
Magnetic induction intensity of the i value in receiving area superposition with, with magnetic induction intensity of the i value in receiving area
Superposition and maximum value are reference, carry out i+1 time value, and calculate magnetic induction intensity of the i+1 time value in receiving area
Superposition and；It is reference with the superposition of magnetic induction intensity of the i+1 value in receiving area and maximum value, take next time
Value, until the superposition of the magnetic induction intensity of the value that finally obtains in receiving area and being less than threshold value, then last value is
Coil parameter optimization can be completed in last design parameter.
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Citations (3)
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|---|---|---|---|---|
| CN101923591A (en) * | 2010-08-09 | 2010-12-22 | 西安理工大学 | Three-dimensional optimal design method of asymmetric cusp magnetic field used for MCZ single crystal furnace |
| CN107038323A (en) * | 2017-06-05 | 2017-08-11 | 江南大学 | One kind is used for wireless charging system for electric automobile magnetic coupling arrangement optimization 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 |
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- 2019-06-27 CN CN201910569264.1A patent/CN110287608B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923591A (en) * | 2010-08-09 | 2010-12-22 | 西安理工大学 | Three-dimensional optimal design method of asymmetric cusp magnetic field used for MCZ single crystal furnace |
| US20120035893A1 (en) * | 2010-08-09 | 2012-02-09 | Xi'an University Of Technology | Method of three-dimensional optimization design for asymmetric cusp magnetic field in mcz single crystal furnace |
| CN107038323A (en) * | 2017-06-05 | 2017-08-11 | 江南大学 | One kind is used for wireless charging system for electric automobile magnetic coupling arrangement optimization 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 |
Non-Patent Citations (1)
| Title |
|---|
| 杨龙成等: "基于混合优化算法的磁聚焦线圈阵列设计与优化", 《四川师范大学学报(自然科学版)》 * |
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