CN111079358A - Method for optimizing transmission performance of wireless charging system in environment close to metal plate - Google Patents

Method for optimizing transmission performance of wireless charging system in environment close to metal plate Download PDF

Info

Publication number
CN111079358A
CN111079358A CN201911061897.8A CN201911061897A CN111079358A CN 111079358 A CN111079358 A CN 111079358A CN 201911061897 A CN201911061897 A CN 201911061897A CN 111079358 A CN111079358 A CN 111079358A
Authority
CN
China
Prior art keywords
coil
environment
metal plate
wpt
transmission performance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911061897.8A
Other languages
Chinese (zh)
Inventor
谭林林
钟汝莹
汤宗尧
黄学良
李佳承
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southeast University
Original Assignee
Southeast University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Southeast University filed Critical Southeast University
Priority to CN201911061897.8A priority Critical patent/CN111079358A/en
Publication of CN111079358A publication Critical patent/CN111079358A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

The invention discloses a method for optimizing the Transmission performance of a Wireless charging system in a proximity metal plate environment, which comprises the steps of theoretically analyzing the influence of an infinite metal environment on a Wireless Power Transmission (WPT) system, proposing an optimization strategy, establishing an electromagnetic simulation model of the WPT system in a non-ferromagnetic metal environment, analyzing magnetic field distribution, proposing an optimization target, proposing an optimization scheme of an additional ferrite based on the principle of magnetic field aggregation, reducing the eddy current of the system by changing the minimum unit size of the ferrite and promoting the Transmission performance of the system. The invention overcomes the complexity of the traditional experiment from the electromagnetic simulation angle, and the proposed optimization scheme can promote the application of the WPT system in the complex military environment, lay a good foundation for the wider development of the WPT technology and provide specific theoretical guidance.

Description

Method for optimizing transmission performance of wireless charging system in environment close to metal plate
Technical Field
The invention relates to a method for optimizing transmission performance of a wireless charging system in an environment close to a metal plate, and belongs to the technical field of wireless power transmission.
Background
The Wireless Power Transmission (WPT) technology has become a new idea for solving the charging problem in many fields, and the characteristics of long propagation distance and high energy Transmission efficiency make the WPT technology more widely applied to civil fields such as electric automobiles, mobile phones and implanted medical equipment, provide guarantee for quick and safe charging of batteries, and avoid the tedious procedures of battery replacement and the danger caused by cables. In recent years, with the application and research of WPT technology, the application field thereof is gradually widened to industrial and military fields, such as ships, airplanes, rockets, and the like.
However, the WPT technology, whether applied to civilian fields such as electric vehicles and the like or military fields such as ships and rockets and the like, inevitably contacts the metal environment, and for a coil system which can work under normal environment, under the background of a relatively large metal plate, the transmission performance of the coil system is inevitably affected, and mainly comprises parameter deviation and transmission performance reduction. Therefore, it is necessary to perform optimization of the coil system in a metal environment background, improve the transmission performance of the WPT system, and promote wide application of the WPT system.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for optimizing the transmission performance of a wireless charging system in the environment close to a metal plate.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for optimizing transmission performance of a wireless charging system in a metal plate proximity environment comprises the following steps:
step one, WPT system performance analysis under a non-ferromagnetic metal environment: establishing equivalent circuit of WPT system in the presence of non-ferromagnetic metal plate, defining L1、R1、C1Coil inductance, coil resistance and matching capacitance, L, of the transmitting terminal, respectively2、R2、C2Coil inductance, coil resistance and matching electricity of receiving end respectivelyContainer, L0、R0Inductance and internal resistance, M, of the equivalent short-circuit loop current of the metal plate20Is the mutual inductance between the metal plate and the receiving coil, M12M 'being mutual inductance between the transmitter coil and the receiver coil in an initial state'12Is the mutual inductance value between the transmitting and receiving coils changed due to the existence of the metal plate, RLIs an equivalent load, and U is an alternating current input power supply;
obtaining a system efficiency, a secondary equivalent impedance and a transmission performance calculation formula of the WPT system in a resonance state under a metal plate environment through circuit analysis, obtaining possible influence of a non-ferromagnetic metal environment on the WPT system, and providing a strategy of improving receiving end inductance and mutual inductance and reducing an eddy current electromagnetic field as optimization;
step two, WPT system modeling and influence analysis under the non-ferromagnetic metal environment, including:
establishing an electromagnetic simulation model of the WPT system in a non-ferromagnetic metal environment: establishing a high coupling coil system model with matched ferrite, and respectively increasing the area and the volume of an aluminum alloy plane and a curved surface which exceed the coverage area of the coil by 10 times for simulating an infinite non-ferromagnetic metal environment;
non-ferromagnetic metal influence analysis and optimization target determination: respectively obtaining the magnetic field intensity, the magnetic line distribution and the system parameter values of the WPT system under three conditions of a free space, an infinite aluminum alloy plane and a curved surface through electromagnetic simulation, calculating to obtain the system transmission performance values under the three conditions, and determining an optimization target;
step three, forming a system optimization scheme, which comprises the following steps:
and (3) forming a preliminary optimization scheme: aiming at a magnetic force line distribution diagram of a WPT system, on the basis of not counting eddy current loss, a ferrite plate is added at a secondary side coil for carrying out magnetic field aggregation, namely, long ferrite plates with the same size are added at the position with the horizontal distance of x mm at two sides of the wide side of the coil (the self-induction correction is excessive due to the fact that the aggregation effect is too strong when the ferrite plates are added at the long side of the coil), and the length F of the ferrite plates is1The same length as the short side of the coil, thickness F3Is 5mm, and has a width of F2The ferrite plates are distributed in the direction and verticalThe angle of the straight line is α, wherein α is in the range of 0-180 degrees;
analysis of regulation rule of parameters by changing single variables α, x and F respectively according to the principle of control variable2Obtaining the variation trend of the self inductance and the mutual inductance of the original secondary coil in the presence of different metal plates through simulation calculation, and forming an optimization scheme;
the optimization scheme is improved: on the basis of the optimization scheme, the whole additional ferrite is divided into n-1, 4,8,16 or more ferrites which are distributed at equal intervals, the eddy current loss of the system is measured and calculated by an eddy current calculation tool, and the lowest eddy current loss scheme is selected.
Compared with the prior art, the technical scheme of the invention is as follows: 1) the optimization method of the transmission performance of the wireless charging system in the environment close to the metal plate, disclosed by the invention, starts from a circuit principle, covers the steps of determining an optimization target of the WPT system, establishing an electromagnetic simulation model, and then providing an optimization scheme and further optimizing the scheme, effectively solves the problems of system parameter deviation and transmission performance reduction of the WPT technology in the metal environment, can effectively improve the waveform of the system, and eliminates waveform distortion caused by non-resonance, and 2) greatly improves the transmission performance of the system and reduces partial eddy current, so that the optimization scheme disclosed by the invention can promote the application of the WPT system in a complex military environment, adds new power for the development of neighborhoods such as military and industry, provides a new thought for reducing the eddy current, lays a good foundation for the wider development of the WPT technology, and provides specific theoretical guidance.
Drawings
Figure 1 is an equivalent circuit of a WPT system in the presence of a non-ferromagnetic metal plate;
FIG. 2 is a WPT system electromagnetic simulation model in an infinite non-ferromagnetic environment;
FIG. 3 is a ferrite optimization scheme in an infinite non-ferromagnetic environment;
FIG. 4 is an optimized scheme for ferrite modification in an infinite non-ferromagnetic environment.
Detailed Description
In order to further understand and understand the present invention, the following description will be made with reference to the accompanying drawings and embodiments.
Example 1: a method for optimizing transmission performance of a wireless charging system in a metal plate proximity environment comprises the following steps:
the method comprises the following steps: analyzing the performance analysis of the WPT system under the non-ferromagnetic metal environment and preliminarily forming an optimization strategy:
establishing an equivalent circuit of the WPT system in the presence of a non-ferromagnetic metal plate as shown in figure 1, and defining L1、R1、C1Coil inductance, coil resistance and matching capacitance, L, of the transmitting terminal, respectively2、R2、C2Respectively a coil inductance, a coil resistance and a matching capacitance, L, of the receiving end0、R0Inductance and internal resistance, M, of the equivalent short-circuit loop current of the metal plate20Is the mutual inductance between the metal plate and the receiving coil, M12M 'being mutual inductance between the transmitter coil and the receiver coil in an initial state'12Is the mutual inductance value between the transmitting and receiving coils changed due to the existence of the metal plate, RLAnd U is an equivalent load and is an alternating current input power supply.
Using kirchhoff's theorem to write KVL equation as
Figure BDA0002258179570000031
Wherein Z1＝R1+jωL1+1/(jωC1)，Z2＝R2+RL+jωL1+1/(jωC1)，I1，I2And I3Respectively representing currents induced on a receiving end, a transmitting end and a metal plate, and deducing the system efficiency and the equivalent impedance Z 'of a secondary side of the WPT system in a resonance state under the environment of the metal plate according to the formula (1)'2；
Figure BDA0002258179570000032
Figure BDA0002258179570000033
Wherein the content of the first and second substances,
Figure BDA0002258179570000034
when the metal plate becomes larger, the number of eddy current loops on the metal plate increases, which means that there will be L shown in FIG. 10、R0When multiple loops affect the secondary side circuit, the equivalent impedance of the receiving end is
Figure BDA0002258179570000035
When the metal plate is large, the system parameter value can shift to make the receiving end deviate from the resonance state, at this time, the transmission part of the system is idle and does not lose energy, but the efficiency expression (2) can not be used for constant system transmission performance, so the definition expression (5) is used for measuring the system transmission performance
Figure BDA0002258179570000041
According to the formulas (3) to (5), the system transmission performance is greatly influenced and interfered under the action of a large-area non-ferromagnetic aluminum alloy plate, and the main reason is that the coil inductance of a receiving end and the system mutual inductance are reduced and the resistance loss caused by eddy current is accompanied. Therefore, the main optimization strategy is to improve the self-inductance and mutual inductance of the receiving end and reduce the eddy current electromagnetic field under the condition of not changing the angle of the coil system.
Step two: establishing a WPT system model under a non-ferromagnetic metal environment and determining an optimization target:
(1) establishing an electromagnetic simulation model of the WPT system in a non-ferromagnetic metal environment:
a high-coupling coil system model is established in ANSYS, the coil system is required, the system is provided with matched ferrite, and the WPT system is located in an infinite non-ferromagnetic metal environment, so that aluminum alloy planes and curved surfaces with areas and volumes 10 times larger than the coil coverage area are respectively increased when the model is established to simulate the infinite non-ferromagnetic metal environment, and an electromagnetic simulation model is shown in figure 2.
(2) Analyzing non-ferromagnetic metal effects and determining optimization objectives:
magnetic field intensity, magnetic line distribution and related system parameter values of the WPT system under three conditions of free space, infinite aluminum alloy plane and curved surface are respectively obtained through ANSYS electromagnetic simulation, specific parameter values comprise self-inductance and mutual inductance values of an original secondary coil, and system parameter deviation and transmission performance β under the three conditions are obtained through calculation, so that the optimization target is determined to correct self-inductance mutual inductance reduction caused by the existence of a non-ferromagnetic metal plate, and meanwhile, β values as large as possible are guaranteed to guarantee system transmission capacity.
Step three: forming a system optimization scheme:
(1) initially forming an optimization scheme:
from the perspective of magnetic field concentration, the more total flux that passes through the area of the coil loop, the greater its self-inductance, regardless of the environment. According to the magnetic force distribution diagram obtained by ANSYS simulation, under an infinite metal environment, the self-induction magnetic force line of the primary coil is basically not influenced, the mutual induction flux linkage generated by the primary coil is blocked at the aluminum plate and cannot form a closed loop, the self-induction flux linkage of the secondary coil is also influenced similarly, but when the self-induction magnetic force line is positioned on the curved plate, the influence is slightly smaller than that of a flat plate due to the existence of a small number of gaps.
The ferrite has an aggregation effect on the magnetic field, so that the ferrite plate is added at the secondary coil to aggregate the magnetic field on the premise of not blocking the distribution of magnetic lines of force by utilizing the characteristic, as shown in fig. 3. That is, long ferrite plates with the same size are added at the position with the horizontal distance of xmm at both sides of the wide side of the coil (adding too strong gathering effect at the long side of the coil can cause excessive self-induction correction), and the length F of the ferrite plates1The same length as the short side of the coil, thickness F3Is 5mm, and has a width of F2The ferrite plates are arranged at an angle α from the vertical, care being taken to avoid improving the self-inductance over the free space corresponding value when setting the parameters.
(2) Analyzing a parameter regulation rule:
using controlled variablesBy changing the single variables α, x, and F, respectively2The variation trends of the self inductance and the mutual inductance of the primary coil and the secondary coil under the existence of different metal plates are obtained through simulation calculation, and an optimal optimization scheme is formed based on the influence characteristics of all parameters.
(3) The improved optimization scheme is as follows:
since the above optimization scheme does not take into account the influence of eddy currents, further optimization is needed to minimize eddy current loss. Firstly, dividing the whole additional ferrite into n 1,4,8,16 or more ferrites respectively, and distributing the ferrites at equal intervals, as shown in fig. 4, then adopting a MAXWELL eddy current calculation tool to simulate the eddy current loss of the systems under the ferrite unit blocks with different sizes respectively, and finally selecting the lowest eddy current loss scheme as the optimal scheme of the WPT system in the non-ferromagnetic metal.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and equivalents and substitutions made on the above-mentioned technical solutions are included in the scope of the present invention, and the scope of the present invention is defined by the claims.

Claims (5)

1. A method for optimizing the transmission performance of a wireless charging system in an environment close to a metal plate is characterized by comprising the following steps: the method comprises the following steps of,
step one, WPT system performance analysis under a non-ferromagnetic metal environment: the method comprises the steps that an equivalent circuit of the WPT system in the presence of a non-ferromagnetic metal plate is established, the influence of a non-ferromagnetic metal environment on the WPT system is analyzed, and an optimization strategy is proposed;
step two, WPT system modeling and influence analysis under the non-ferromagnetic metal environment, including:
establishing an electromagnetic simulation model of the WPT system in a non-ferromagnetic metal environment: establishing a high coupling coil system model, and adding an infinite non-ferromagnetic metal environment;
non-ferromagnetic metal influence analysis and optimization target determination: respectively obtaining the magnetic field intensity, magnetic line distribution and system parameter values of the WPT system in free space and infinite non-ferromagnetic metal environments through electromagnetic simulation, calculating to obtain the system transmission performance value under each condition, and determining an optimization target;
step three, forming a system optimization scheme, which comprises the following steps:
and (3) forming a preliminary optimization scheme: aiming at the magnetic force line distribution diagram obtained by simulation, on the basis of not counting eddy current loss, a scheme of adding a ferrite plate at the secondary side coil for magnetic field aggregation is provided;
analyzing a parameter regulation rule: respectively changing single variables by adopting a principle of controlling the variables, obtaining the variation trend of the self inductance and the mutual inductance of the original secondary coil in the presence of different metal plates through simulation calculation, and forming an optimization scheme;
the optimization scheme is improved: on the basis of the optimization scheme, the whole additional ferrite is divided into a plurality of ferrite units which are distributed at equal intervals, the eddy current loss of the system is measured and calculated through an eddy current calculation tool, and the lowest eddy current loss scheme is selected.
2. The method for optimizing transmission performance of a wireless charging system in a proximity metal plate environment according to claim 1, wherein: in the first step, an equivalent circuit of the WPT system is established in the presence of a non-ferromagnetic metal plate, and L is defined1、R1、C1Coil inductance, coil resistance and matching capacitance, L, of the transmitting terminal, respectively2、R2、C2Respectively a coil inductance, a coil resistance and a matching capacitance, L, of the receiving end0、R0Inductance and internal resistance, M, of the equivalent short-circuit loop current of the metal plate20Is the mutual inductance between the metal plate and the receiving coil, M12M 'being mutual inductance between the transmitter coil and the receiver coil in an initial state'12Is the mutual inductance value between the transmitting and receiving coils changed due to the existence of the metal plate, RLIs an equivalent load, and U is an alternating current input power supply;
a calculation formula of system efficiency, secondary equivalent impedance and transmission performance of the WPT system in a resonance state under a metal plate environment is obtained through circuit analysis, possible influence of a non-ferromagnetic metal environment on the WPT system is obtained, and a strategy of improving receiving end inductance and mutual inductance and reducing an eddy current electromagnetic field is provided as an optimization strategy.
3. The method for optimizing transmission performance of a wireless charging system in a proximity metal plate environment according to claim 2, wherein in the second step: the infinite non-metallic ferromagnetic environment needs to satisfy aluminum alloy planes and curved surfaces with areas and volumes 10 times larger than the coverage area of the coil system.
4. The method for optimizing transmission performance of a wireless charging system in an environment close to metal plates according to claim 2 or 3, wherein in the third step, a preliminary optimization scheme is formed, specifically, for a magnetic force line distribution diagram of the WPT system, on the basis of not counting eddy current loss, it is proposed to add ferrite plates at the secondary side coil for magnetic field aggregation, that is, to add long ferrite plates with the same size at the x mm horizontal distance at two sides of the wide side of the coil (adding too strong aggregation effect at the long side of the coil would result in excessive self-induction correction), and the length F of the long ferrite plates is too long1The same length as the short side of the coil, thickness F3Is 5mm, and has a width of F2The ferrite plates were distributed at an angle α from the vertical.
5. The method for optimizing transmission performance of a wireless charging system in an environment close to a metal plate according to claim 4, wherein in the third step, the parameter adjustment rule analysis specifically includes changing single variables α, x and F respectively according to the principle of control variables2And obtaining the variation trend of the self inductance and the mutual inductance of the original secondary coil in the presence of different metal plates through simulation calculation, and forming an optimization scheme.
CN201911061897.8A 2019-11-01 2019-11-01 Method for optimizing transmission performance of wireless charging system in environment close to metal plate Pending CN111079358A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911061897.8A CN111079358A (en) 2019-11-01 2019-11-01 Method for optimizing transmission performance of wireless charging system in environment close to metal plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911061897.8A CN111079358A (en) 2019-11-01 2019-11-01 Method for optimizing transmission performance of wireless charging system in environment close to metal plate

Publications (1)

Publication Number Publication Date
CN111079358A true CN111079358A (en) 2020-04-28

Family

ID=70310625

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911061897.8A Pending CN111079358A (en) 2019-11-01 2019-11-01 Method for optimizing transmission performance of wireless charging system in environment close to metal plate

Country Status (1)

Country Link
CN (1) CN111079358A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112087062A (en) * 2020-09-18 2020-12-15 重庆大学 Coupling mechanism for inhibiting pickup coil plane metal influence and parameter design method thereof
CN113555974A (en) * 2021-07-29 2021-10-26 西南交通大学 Hybrid shielding structure for inhibiting leakage magnetic field of wireless power supply system and optimization method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN107482797A (en) * 2017-09-14 2017-12-15 西安交通大学 Loop coil electromagnetic radiation Forecasting Methodology based on resonance type wireless power transmission
US20180233277A1 (en) * 2015-08-03 2018-08-16 University Of Houston System Wireless power transfer systems and methods along a pipe using ferrite materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180233277A1 (en) * 2015-08-03 2018-08-16 University Of Houston System Wireless power transfer systems and methods along a pipe using ferrite materials
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
CN107482797A (en) * 2017-09-14 2017-12-15 西安交通大学 Loop coil electromagnetic radiation Forecasting Methodology based on resonance type wireless power transmission

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZONGYAO TANG等: "A Transmission Performance Optimization Method of Wireless Charging System Under Adjacent Large Metal Plate Environment Based on Magnetic Field Aggregation", 《IEEE ACCESS》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112087062A (en) * 2020-09-18 2020-12-15 重庆大学 Coupling mechanism for inhibiting pickup coil plane metal influence and parameter design method thereof
CN113555974A (en) * 2021-07-29 2021-10-26 西南交通大学 Hybrid shielding structure for inhibiting leakage magnetic field of wireless power supply system and optimization method thereof
CN113555974B (en) * 2021-07-29 2023-10-10 西南交通大学 Mixed shielding structure for inhibiting leakage magnetic field of wireless power supply system and optimization method thereof

Similar Documents

Publication Publication Date Title
Yilmaz et al. Multi-objective optimization of circular magnetic couplers for wireless power transfer applications
Mou et al. Energy-efficient and adaptive design for wireless power transfer in electric vehicles
CN111079358A (en) Method for optimizing transmission performance of wireless charging system in environment close to metal plate
CN111064239B (en) Load positioning and power constant control method for three-dimensional wireless charging system
US11216601B2 (en) Directed magnetic field coil design
Castillo-Zamora et al. Hexagonal geometry coil for a WPT high-power fast charging application
CN109510328B (en) Reconfigurable wireless power transmission system with self-adaptive offset
CN107038323A (en) One kind is used for wireless charging system for electric automobile magnetic coupling arrangement optimization method
Xu et al. Optimal design of planar spiral coil for uniform magnetic field to wirelessly power position-free targets
Luo et al. A frequency-tracking and impedance-matching combined system for robust wireless power transfer
CN109861402A (en) A kind of triple-pole type magnetic coupling transmitting terminal and its magnetic coupling applied to electric car wireless power supply system
CN109726456A (en) Magnetic resonance based on Chaos particle swarm optimization algorithm couples spiral winding optimum design method
CN110001423A (en) A kind of IPT System planes Optimization Design on Coil method based on LCL resonance topological
Ming et al. Performance optimization method of wireless power transfer system based on magnetic field editing
CN111178528B (en) Elite genetic algorithm improvement method applied to wireless charging system
Kobuchi et al. Cancellation conditions of magnetic field leakage from inductive power transfer systems
CN113555974B (en) Mixed shielding structure for inhibiting leakage magnetic field of wireless power supply system and optimization method thereof
Zhang et al. High-Power-Density Wireless Power Transfer System for Autonomous Underwater Vehicle Based on a Variable Ring-Shaped Magnetic Coupler
Bien et al. Metal surface guided-wireless power transfer system for portable applications with multiple receivers
Dong et al. Experimental investigation of 6.78 MHz metamaterials for efficiency enhancement of wireless power transfer system
Shangguan et al. Unified magnetic field model of regular polygonal coils for electromagnetic assessment in WPT systems
Zhang et al. A numerical method to reduce the stray magnetic field around the asymmetrical wireless power transfer coils for electric vehicle charging
Xiao et al. Position-Insensitive WPT System with an Integrated Coupler Based on ANN Modeling and Variable Frequency Control
Zhang et al. Enhanced power transmission for on-road AGV wireless charging systems using a current-optimized technique
Arabsalmanabadi et al. Analytical and numerical design study of torus coils with misalignment for efficient inductive energy transmission in EV chargers

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination