CN115133667A - Novel asymmetric magnetic coupling structure for wireless power transmission - Google Patents

Novel asymmetric magnetic coupling structure for wireless power transmission Download PDF

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Publication number
CN115133667A
CN115133667A CN202210795749.4A CN202210795749A CN115133667A CN 115133667 A CN115133667 A CN 115133667A CN 202210795749 A CN202210795749 A CN 202210795749A CN 115133667 A CN115133667 A CN 115133667A
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coupling structure
coil
power transmission
wireless power
primary side
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陈龙
吴飞
贲彤
张春伟
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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    • 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
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

A novel asymmetric magnetic coupling structure for wireless power transmission comprises a primary side coupling structure and a secondary side coupling structure which are arranged oppositely, wherein the primary side coupling structure is positioned below the secondary side coupling structure; the primary side coupling structure comprises a primary side magnetic core, wherein a transverse coil and a longitudinal coil are wound on the surface of the primary side magnetic core in a crossed manner, and the number of the transverse coil and the number of the longitudinal coil are two; a first outer coil and a second outer coil are wound on the outer side of the side surface of the primary side magnetic core; the secondary side coupling structure comprises a secondary side coil. The invention provides a novel asymmetric magnetic coupling structure for wireless power transmission, which can be called as an asymmetric field-shaped magnetic coupling structure compared with a traditional coil structure. When the invention is applied to a wireless power transmission system, the coupling coefficient change is small when the large offset occurs, the invention has stronger anti-offset capability, and can solve the problem of large transmission efficiency change caused by the misalignment of the transmitting end and the receiving end.

Description

Novel asymmetric magnetic coupling structure for wireless power transmission
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a novel asymmetric magnetic coupling structure for wireless power transmission.
Background
The induction type wireless power transmission technology provides an effective and feasible way for solving the problems of potential safety hazards and the like caused by traditional contact charging. The technology can thoroughly avoid the dependence of the traditional plug-in charging on the conductor, and has the advantages of safe, flexible and reliable power supply, no contact spark and no influence of severe environments such as rain, snow and the like. IPT technology has found applications in the fields of medical electronics, consumer electronics, electric vehicles, household appliances, aerospace, and the like.
The inductive wireless power transmission technology has a high degree of spatial freedom, however, the primary side coupling coil and the secondary side coupling coil are not always completely aligned, and offset exists between the primary side coupling coil and the secondary side coupling coil, which will cause the reduction of coupling coefficient, and will cause a series of problems such as the reduction of system stability, the weakening of power transmission capability, the detuning of system circuit, the increase of energy loss, etc. Therefore, the method has great significance for the development of the induction type wireless power transmission technology, improves the transmission performance of the wireless power transmission system, enhances the anti-offset performance of the wireless power transmission system, solves the problems of unstable output result and the like.
At present, the anti-offset method mainly comprises a control strategy, a coupling mechanism design and an optimized compensation topology, and has advantages and disadvantages in comparison. The deviation of the coupling mechanism affects each module of the wireless power transmission system, and the constant current/voltage/power required at two ends of the load can be maintained by adjusting the controllable variable of the corresponding module, but additional components and complex control methods are often required, which may result in the increase of system cost, volume and additional loss. For the compensation topology optimization method: basic compensation structures (SS, SP, PS, PP) can not meet the requirements of the wireless power system at the present stage, and researchers propose more novel topologies, such as an S/LCL compensation topology, an LCL/S topology, an LCL/LCL compensation topology, an LCC/LCC compensation topology and the like. Compared with the traditional compensation structure, the novel compensation topological structure has the advantages of high design flexibility, good anti-offset performance and the like, and the effect expected by researchers is still not achieved by improving the anti-offset performance through the method of optimizing the compensation structure. For the design of the coupling structure, most of the structures commonly used in the existing wireless power transmission system can meet the practical requirements, such as a circular coil structure, a rectangular coil structure, a "DD" type coil structure, and the like. However, once the transmitting end and the receiving end have a large offset, the coupling coefficient is also greatly reduced, especially in the lateral offset of the DD-type coil structure.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a novel asymmetric magnetic coupling structure for wireless power transmission, and when a transmitting end and a receiving end are greatly deviated, the change of a coupling coefficient is small, and good power transmission can be ensured.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a novel asymmetric magnetic coupling structure for wireless power transmission comprises a primary side coupling structure and a secondary side coupling structure which are arranged oppositely, wherein the primary side coupling structure is positioned below the secondary side coupling structure;
the primary side coupling structure comprises a primary side magnetic core, wherein a transverse coil and a longitudinal coil are wound on the surface of the primary side magnetic core in a crossed manner, and the number of the transverse coil and the number of the longitudinal coil are two; a first outer coil and a second outer coil are wound on the outer side of the side surface of the primary side magnetic core;
the secondary side coupling structure comprises a secondary side coil.
Preferably, the two transverse coils are adjacently and symmetrically wound on the surface of the primary side magnetic core, and the two longitudinal coils are adjacently and symmetrically wound on the surface of the primary side magnetic core.
Preferably, the transverse coil and the longitudinal coil are wound by adopting planar solenoid coils, and the winding shape and the winding turns are the same.
Preferably, the directions of the currents in the transverse coil and the longitudinal coil are perpendicular to each other.
Preferably, the primary core is a ferrite core, and the first outer coil and the second outer coil are sequentially wound around the outer edge of the ferrite core in a square shape.
Preferably, the current directions in the first outer coil and the second outer coil are both counterclockwise.
Preferably, the secondary coil is wound over the primary magnetic coupling structure in a planar rectangular manner.
Preferably, the primary side magnetic core is square, and the secondary side coupling structure is not provided with a magnetic core.
The invention provides a novel asymmetric magnetic coupling structure for wireless power transmission, which can be called as an asymmetric field-shaped magnetic coupling structure compared with a traditional coil structure. When the invention is applied to a wireless power transmission system, the coupling coefficient change is small when the large offset occurs, the invention has stronger anti-offset capability, and can solve the problem of large transmission efficiency change caused by the misalignment of the transmitting end and the receiving end.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of the novel asymmetric magnetic coupling structure of the present invention;
FIG. 2 is a schematic illustration of an explosive structure according to the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a Y-Z plane two-dimensional magnetic field distribution cloud diagram of the novel asymmetric magnetic coupling structure of the present invention;
FIG. 5 is a two-dimensional magnetic field distribution cloud of the Y-X plane of the novel asymmetric magnetic coupling structure of the present invention;
FIG. 6 is a two-dimensional magnetic field distribution cloud of the X-Z plane of the novel asymmetric magnetic coupling structure of the present invention;
FIG. 7 is a graph of the varying lines of mutual inductance M at different offset distances in the X and Y directions;
FIG. 8 is a line graph showing the variation of the mutual inductance M at different offset distances along the Z direction;
FIG. 9 is a graph of the varying lines of mutual inductance M at different angular offsets in the X and Y directions;
FIG. 10 is a line graph showing the variation of transmission efficiency at different offset distances along the X direction;
FIG. 11 is a line graph showing the variation of transmission efficiency at different offset distances along the Y direction;
FIG. 12 is a line graph showing the variation of transmission efficiency at different offset distances in the Z direction;
FIG. 13 is a diagram of an optimal deflection area;
fig. 14 is a simulation circuit diagram of a wireless power transmission system.
Detailed Description
As shown in fig. 1-3, a novel asymmetric magnetic coupling structure for wireless power transmission includes a primary side coupling structure 1 and a secondary side coupling structure 2, which are oppositely disposed, wherein the primary side coupling structure 1 is located below the secondary side coupling structure 2;
the primary side coupling structure 1 comprises a primary side magnetic core 101, a transverse coil 104 and a longitudinal coil 105 are wound on the surface of the primary side magnetic core 101 in a crossed mode, and the number of the transverse coil 104 and the number of the longitudinal coil 105 are two; a first outer coil 103 and a second outer coil 102 are wound on the outer side of the side surface of the primary magnetic core 101;
the secondary coupling structure 2 comprises a secondary coil 201.
Preferably, two transverse coils 104 are adjacently and symmetrically wound on the surface of the primary magnetic core 101, and two longitudinal coils 105 are adjacently and symmetrically wound on the surface of the primary magnetic core 101.
Preferably, the transverse coil 104 and the longitudinal coil 105 are wound by using a planar solenoid coil, and the winding shape and the winding number are the same.
Preferably, the directions of the currents in the transverse coil 104 and the longitudinal coil 105 are perpendicular to each other.
Preferably, the primary core 101 is a ferrite core, and the first outer coil 103 and the second outer coil 102 are sequentially wound around the outer edge of the ferrite core in a square shape.
Preferably, the current directions in the first outer coil 103 and the second outer coil 102 are both counterclockwise.
Preferably, the secondary coil 201 is wound in a planar rectangular manner and is located right above the primary magnetic coupling structure 1.
Preferably, the primary side magnetic core 101 is square, and the secondary side coupling structure 2 is not provided with a magnetic core.
FIG. 4 shows a schematic diagram of the magnetic field distribution in the Y-Z plane when the invention is not offset.
FIG. 5 shows a schematic diagram of the magnetic field distribution in the Y-X plane when the invention is not shifted.
FIG. 6 shows a schematic diagram of the magnetic field distribution in the X-Z plane when the present invention is not offset.
FIG. 7 shows the variation of mutual inductance in the X and Y offset directions in addition to the present invention; the change of the mutual inductance coefficient of the structure when the structure is deviated in the X and Y directions can be obtained by finite element software analysis.
FIG. 8 is a graph of the varying line of mutual inductance M at different offset angles in the X and Y directions; the change of the mutual inductance coefficient of the receiving end can be obtained by analyzing the finite element software and setting the receiving end under different offset angles in the X direction and the Y direction.
FIG. 9 shows the variation of the mutual inductance in the Z-offset direction in addition to the present invention; the change of the mutual inductance coefficient when the structure is deviated in the Z direction can be obtained by finite element software analysis.
FIG. 10 shows the efficiency variation of the present invention under X-direction deflection; the transmission efficiency can be calculated through circuit simulation software according to the mutual inductance change caused by the deviation of the transmission line in the X direction.
FIG. 11 shows the change in efficiency of the present invention under Y-direction bias; the mutual inductance change caused by the deviation of the transmission line in the Y direction can be calculated through circuit simulation software.
FIG. 12 shows the efficiency variation of the present invention with Z-direction offset; the mutual inductance change caused by the deviation of the transmission line in the Z direction can be calculated by circuit simulation software
FIG. 13 illustrates the optimal offset region of the structure; through the change of the efficiency of the displacement in the X direction and the Y direction, the optimal displacement area can be obtained, and the optimal displacement area has the best output performance.
Fig. 14 is a wireless power transmission system simulation circuit; in order to verify the structural feasibility, an SS compensation structure is selected to build a wireless power transmission system simulation platform for verification.
Specifically, the dimensions are as follows:
Figure BDA0003735763950000041
finite element analysis is carried out on the structure to realize the omnibearing offset of the receiving end. The obtained two-dimensional magnetic field distribution cloud pictures are shown in fig. 4, 5 and 6, and the mutual inductance change of the two-dimensional magnetic field distribution cloud pictures is calculated under the condition of setting different direction offsets, as shown in fig. 7, the structure has higher mutual inductance with small change amplitude in the-X offset direction, has higher mutual inductance with small change amplitude in the + Y direction offset direction, has better anti-offset performance on the X-Y plane of the two mutual inductance changes, and simultaneously calculates the mutual inductance change of the two-dimensional magnetic field distribution cloud pictures in the Z direction different offset directions. The second outside coil 102 and the first outside coil 103 are wound on the generating end magnetic core in a ring shape, the direction of the generated magnetic field is vertical upward and is the same as the Z direction, the transverse coil 104 and the longitudinal coil 105 are wound on the magnetic core in a wrapping mode, the direction of the generated magnetic field is mainly the same as the X direction and the Y direction, and the second outside coil 102, the first outside coil 103, the transverse coil 104 and the longitudinal coil 105 form a transmitting end coupling structure to generate a three-dimensional magnetic field, so that good output characteristics of the receiving coil can be guaranteed when the X direction and the Y direction are rotated in an angle, and mutual inductance of the receiving coil can be kept relatively stable when the X direction and the Y direction are rotated in an angle of 50 degrees as shown in figure 8. In order to verify the usability of the structure in the whole wireless power transmission system, the structure is subjected to simulation verification by using circuit simulation software, and the related efficiency is calculated, wherein the whole circuit diagram of the system is shown as 13, and the specific parameters are shown as the following table.
Parameter symbol Parameter value
V DC 70V
L p 346.85μH
L s 46.37μH
C 1 10.1078nF
C 2 75.6075nF
R L 15Ω
As shown in fig. 10, the transmission efficiency can reach 87.17% when no offset occurs, and the transmission efficiency is stable in the-X offset direction, and even if the offset is-100 mm, the efficiency is reduced to 83.84%, and in the + X offset direction, the transmission efficiency is reduced to 81.32% when the offset is 50 mm; meanwhile, as shown in fig. 11, stable transmission efficiency is also achieved in the + Y shift direction, and even at a shift of 100mm, the efficiency is merely reduced to 84.18%, and the transmission efficiency is reduced to 81.59% at a shift of 50 mm. In conclusion, the present invention has excellent offset resistance and stable transmission efficiency in the gray offset region as shown in fig. 13; in the Z offset direction, when offset does not occur, the efficiency is up to 87.17% when the transmission distance is 80mm, and when offset occurs 35mm, the efficiency is reduced to 71.47% when the transmission distance reaches 135 mm. According to the analysis, the structure has good transmission performance under the condition that the X direction and the Y direction deviate, meanwhile, compared with a well-shaped magnetic coupling structure, when the X direction and the Y direction rotate at an angle, the structure also has good transmission performance, a communication link and a complex control strategy are not required to be added, wireless power transmission under a full-angle deviation angle can be realized, and compared with the well-shaped structure, a receiving end of the structure only needs one rectangular coil, the weight, the size and the cost of the receiving end are effectively reduced, and the structure is in line with practical application.
The working principle and the using process of the invention are as follows: the wireless electric energy transmission system mainly comprises a voltage-stabilizing direct-current power supply, a full-bridge inverter circuit, a compensation topological structure, a magnetic coupling structure, a rectifying circuit, a load and the like. The transmitting end adopts a field-shaped magnetic coupling structure, and the receiving end adopts a D-shaped magnetic coupling structure. The specific working principle is as follows: the direct current generated by the voltage-stabilizing direct-current power supply is converted into a high-frequency square wave through the full-bridge inverter circuit, then the high-frequency alternating current generated by inversion and the overcompensation circuit are transmitted to the transmitting end magnetic coupling structure and transmitted to the receiving end in a magnetic coupling resonance mode, compensation is performed through the compensation circuit again, then the high-frequency alternating current of the receiving end is rectified in a high-frequency mode, electric energy is transmitted to a load, and finally wireless energy transmission is achieved.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of this invention.

Claims (8)

1. A novel asymmetric magnetic coupling structure for wireless power transmission, its characterized in that: the device comprises a primary side coupling structure (1) and a secondary side coupling structure (2) which are arranged oppositely, wherein the primary side coupling structure (1) is positioned below the secondary side coupling structure (2);
the primary side coupling structure (1) comprises a primary side magnetic core (101), a transverse coil (104) and a longitudinal coil (105) are wound on the surface of the primary side magnetic core (101) in a crossed mode, and the number of the transverse coil (104) and the number of the longitudinal coil (105) are two; a first outer coil (103) and a second outer coil (102) are wound on the outer side of the side surface of the primary side magnetic core (101);
the secondary side coupling structure (2) comprises a secondary side coil (201).
2. The novel asymmetric magnetic coupling structure for wireless power transmission according to claim 1, wherein: two transverse coils (104) are adjacently and symmetrically wound on the surface of the primary side magnetic core (101), and two longitudinal coils (105) are adjacently and symmetrically wound on the surface of the primary side magnetic core (101).
3. The novel asymmetric magnetic coupling structure for wireless power transmission according to claim 1 or 2, characterized in that: the transverse coil (104) and the longitudinal coil (105) are wound by adopting a planar solenoid coil, and the winding shape and the winding turns are the same.
4. The novel asymmetric magnetic coupling structure for wireless power transmission according to claim 1, wherein: the current directions in the transverse coil (104) and the longitudinal coil (105) are mutually perpendicular.
5. The novel asymmetric magnetic coupling structure for wireless power transmission according to claim 1, wherein: the primary side magnetic core (101) is made of ferrite magnetic core, and the first outer side coil (103) and the second outer side coil (102) are sequentially wound around the outer edge of the ferrite magnetic core in a square shape.
6. The novel asymmetric magnetic coupling structure for wireless power transmission according to claim 1, wherein: the current directions in the first outer coil (103) and the second outer coil (102) are both anticlockwise.
7. The novel asymmetric magnetic coupling structure for wireless power transmission according to claim 1, wherein: and the secondary coil (201) is wound right above the primary magnetic coupling structure (1) in a planar rectangular mode.
8. The novel asymmetric magnetic coupling structure for wireless power transmission according to claim 1, wherein: the primary side magnetic core (101) is square, and the secondary side coupling structure (2) is not provided with a magnetic core.
CN202210795749.4A 2022-07-07 2022-07-07 Novel asymmetric magnetic coupling structure for wireless power transmission Pending CN115133667A (en)

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