CN211239459U

CN211239459U - Shielding layer structure for wireless power transmission system

Info

Publication number: CN211239459U
Application number: CN201921693932.3U
Authority: CN
Inventors: 鲍春明; 孙磊; 王强; 李垚; 成晓俊
Original assignee: Zibo Power Supply Co of State Grid Shandong Electric Power Co Ltd
Current assignee: Zibo Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2020-08-11
Anticipated expiration: 2029-10-09

Abstract

The utility model provides a shielding layer structure for wireless power transmission system includes first ferrite and second ferrite; the first ferrite is arranged along the radius direction of the annular concentrated structure and symmetrically distributed on two sides of the annular concentrated structure; the first end of the first ferrite faces to the circumferential end of the annular concentration structure and is positioned outside the outer circumference of the annular concentration structure; the second end of the first ferrite faces to the circle center end of the annular concentration structure and is positioned on the inner side of the inner circumference of the annular concentration structure; the first plane of the first ferrite faces the annular concentration structure and is parallel to the annular plane of the annular concentration structure; the second ferrite is arranged at the first end of the first ferrite and is attached to the first plane of the first ferrite; the arrangement direction of the second ferrite is parallel to the tangent line of the outer circumference of the annular concentration structure and is positioned outside the outer circumference of the annular concentration structure. The shielding layer structure has the advantages that the shielding material is saved while the electrical performance and the shielding effectiveness of the wireless electric energy transmission system are considered.

Description

Shielding layer structure for wireless power transmission system

Technical Field

The utility model relates to an electromagnetism technical field especially relates to a shielding layer structure for wireless power transmission system.

Background

With the continuous development and progress of science and technology, Wireless Power Transfer (WPT) technology has been rapidly developed. An Inductive Power Transfer (IPT) technology based on an electromagnetic induction principle is one of the most main forms of WPT, and the IPT technology has been widely applied to the fields of robots, electric vehicles and the like. The electromagnetic coupler (also called magnetic coupler) is a connection link of a transmitting end and a receiving end of an IPT charging system, and is also the most critical component in the IPT system, and the design of the structure and parameters of the electromagnetic coupler directly influences the performance of the system. The design of the electromagnetic coupler includes the design of the coupling coil and the design of the shielding layer. Because the transmitting coil and the receiving coil of the coupling coil are both non-contact, a certain gap (the space between the two electromagnetic resonance type coils is larger) exists, a large amount of magnetic leakage can be generated in the transmission process of energy, energy loss is caused, and the formed electromagnetic radiation can affect the surrounding environment.

In order to improve the coupling performance of the system and reduce the electromagnetic radiation, a ferromagnetic material with high magnetic permeability is usually added as a shielding layer below the transmitting coil and above the receiving coil. At present, manganese zinc ferrite is mostly adopted in a shielding layer in the field of wireless power transmission systems, and the shielding layer is mostly disc-shaped or strip-shaped, and the mode has the following defects: (1) the electromagnetic shielding effect on the horizontal non-working area is not ideal; (2) the volume and weight required by the shielding material are too large; (3) there is an edge effect.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect of prior art, the utility model provides a shielding layer structure for wireless power transmission system.

The utility model provides a shielding layer structure for wireless power transmission system, which is applied to an annular centralized structure consisting of a transmitting coil and a receiving coil, and comprises a first ferrite and a second ferrite; the first ferrite and the second ferrite are in cuboid shapes; the number of the first ferrite and the second ferrite is multiple and is the same;

the first ferrite is arranged along the radius direction of the annular concentrated structure and symmetrically distributed on two sides of the annular concentrated structure; the first end of the first ferrite faces to the circumferential end of the annular concentration structure and is positioned outside the outer circumference of the annular concentration structure; the second end of the first ferrite faces to the circle center end of the annular concentration structure and is positioned on the inner side of the inner circumference of the annular concentration structure; the first plane of the first ferrite faces the annular concentration structure and is parallel to the annular plane of the annular concentration structure;

the second ferrite is arranged at the first end of the first ferrite and is attached to the first plane of the first ferrite; the arrangement direction of the second ferrite is parallel to the tangent line of the outer circumference of the annular concentration structure and is positioned outside the outer circumference of the annular concentration structure.

The shielding layer structure as described above, preferably, the number of the first ferrite and the second ferrite is 16, and the first ferrite and the second ferrite are uniformly distributed on two sides of the annular concentration structure; the second ferrite is symmetrically distributed on the two sides of the first ferrite.

As in the shielding layer structure described above, the first ferrite preferably has a thickness of 2 to 5 mm; the length of the first ferrite is equal to 2 times the width of the coil adjacent thereto, the width of the coil being the difference between the outer diameter and the inner diameter of the coil.

As in the shielding layer structure described above, preferably, the thickness of the second ferrite is equal to the height of the coil adjacent thereto; the length of the second ferrite is 3-5 mm.

The utility model provides a shielding layer structure for wireless power transmission system through combining together first ferrite and second ferrite, has improved one and has restrained edge effect, has reduced the magnetic leakage of horizontal direction, and then has strengthened the degree of coupling of system. The utility model provides a technical scheme when taking into account wireless power transmission system electrical property and shielding effectiveness, has improved the utilization ratio of ferrite, has reduced shielding material's use, has reduced the volume and the weight of magnetic coupler.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a perspective view of an embodiment of a shielding layer structure provided by the present invention;

fig. 2 is a top view of an embodiment of a shielding layer structure provided by the present invention;

fig. 3 is a cross-sectional view of an embodiment of a shielding layer structure provided by the present invention.

In the above figures: 1. a transmitting coil; 2. a receiving coil; 3. a first ferrite; 4. a second ferrite; 5. an annular concentrating structure; 101. an outer circumference of the annular concentrating structure; 201. an inner circumference of the annular concentrating structure; 301. a first end of a first ferrite; 302. a second end of the first ferrite; 303. a first plane of first ferrite.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 is a perspective view of an embodiment of a shielding layer structure provided by the present invention, fig. 2 is a top view of an embodiment of a shielding layer structure provided by the present invention, and fig. 3 is a cross-sectional view of an embodiment of a shielding layer structure provided by the present invention. Referring to fig. 1-3, the present invention provides a shielding layer structure for wireless power transmission system, which can be applied to an annular centralized structure 5 composed of a transmitting coil 1 and a receiving coil 2. Specifically, the shielding layer structure includes a first ferrite 3 and a second ferrite 4; the first ferrite 3 and the second ferrite 4 are cuboid; the number of the first ferrite 3 and the second ferrite 4 is plural and is the same.

The first ferrites 3 are arranged along the radius direction of the annular centralized structure 5 and are symmetrically distributed on two sides of the annular centralized structure 5; the first end 301 of the first ferrite is towards the circumferential end of the annular concentrator structure 5 and is located outside the outer circumference 101 of the annular concentrator structure; the second end 302 of the first ferrite faces the circle center end of the annular concentration structure and is positioned inside the inner circumference 201 of the annular concentration structure; the first plane 303 of the first ferrite faces the annular concentration structure 5 and is parallel to the annular plane of the annular concentration structure 5; the second ferrite 4 is arranged at the first end 301 of the first ferrite and is attached to the first plane 303 of the first ferrite; the second ferrite 4 is disposed in a direction parallel to a tangent line to the outer circumference 101 of the annular concentration structure and outside the outer circumference 101 of the annular concentration structure.

In a specific application, the number of the first ferrite 3 and the second ferrite 4 is preferably 16, and the first ferrite and the second ferrite are uniformly distributed on two sides of the annular concentration structure 5; the second ferrite 4 is symmetrically distributed on the two sides of the first ferrite 3. The preferred thickness of the first ferrite 3 is 2-5 mm; the preferred length of the first ferrite 3 is equal to 2 times the width of the coil adjacent thereto, said width being the difference between the outer and inner diameter of the coil. Further, the preferred thickness of the second ferrite 4 is equal to the height of the coil adjacent thereto; the preferred length of the second ferrite 4 is 3-5 mm.

In the embodiment shown in fig. 1-3, the main structure of the shielding layer comprises eight horizontally oriented ferrite strips a (first ferrites) and eight vertically oriented ferrite strips B (second ferrites). The shielding layer is arranged below the transmitting coil and above the receiving coil for magnetic field shielding and adopts a symmetrical structure. The eight ferrite strips in the horizontal direction are used as a first low-magnetic-resistance loop, and magnetic flux paths in the vertical direction of the system can be restrained, so that magnetic flux leakage of the system in the vertical direction is reduced; the ferrite strip in the vertical direction is used as a second low-magnetic-resistance loop to restrict a magnetic flux path in the horizontal direction of the system, so that the magnetic flux leakage in the horizontal direction of the system can be reduced. The magnetic leakage in the horizontal direction of the system is shielded, and the edge effect is restrained, so that the coupling degree of the system is enhanced. The lengths of the eight ferrite strips A in the horizontal direction can be selected to be 2 times of the width of the coil, the thicknesses can be selected to be 2-5mm according to the transmitted power, and the lengths can be selected to be about 2 times of the width of the coil, so that magnetic flux leakage in the vertical direction of the system is mainly shielded; the thicknesses of the eight vertical ferrite B can be selected to be the same as the height of the coil, and the lengths are selected to be 3-5mm according to the weight limit of a specific application occasion on the shielding layer.

In summary, the technical solution provided by the present invention adopts a novel shielding layer structure composed of ferromagnetic material ferrite, and the main structure of the shielding layer includes horizontal direction ferrite strips (first ferrite) and vertical direction ferrite strips (second ferrite); the electromagnetic interference of the system surrounding environment to the wireless power transmission system is reduced, and the stability of the system is improved. The utility model provides a shielding layer structure compares with current shielding layer structure, and the ferrite all adopts the strip, compares in traditional disc or square shielding layer can effectively lighten the volume and the weight on shielding layer, compares in traditional strip shielding structure simultaneously, the utility model provides a shielding layer structure can be under the condition that does not show the increase shielding layer weight further reduce system horizontal direction's magnetic leakage.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A shielding layer structure for a wireless power transfer system, applied to a ring-shaped concentration structure (5) consisting of a transmitter coil (1) and a receiver coil (2), characterized in that the shielding layer structure comprises a first ferrite (3) and a second ferrite (4); the first ferrite (3) and the second ferrite (4) are in cuboid shapes; the number of the first ferrite (3) and the second ferrite (4) is multiple and the number of the first ferrite and the second ferrite is the same;

the first ferrites (3) are arranged along the radius direction of the annular concentration structure (5) and are symmetrically distributed on two sides of the annular concentration structure (5); the first end (301) of the first ferrite faces the circumferential end of the annular concentration structure (5) and is positioned outside the outer circumference (101) of the annular concentration structure; the second end (302) of the first ferrite faces to the circle center end of the annular concentration structure (5) and is positioned inside the inner circumference (201) of the annular concentration structure; a first plane (303) of the first ferrite faces the annular concentrating structure (5) and is parallel to the annular plane of the annular concentrating structure (5);

the second ferrite (4) is arranged at the first end (301) of the first ferrite and is attached to the first plane (303) of the first ferrite; the arrangement direction of the second ferrite (4) is parallel to the tangent of the outer circumference (101) of the annular concentration structure and is positioned outside the outer circumference (101) of the annular concentration structure.

2. The shielding layer structure according to claim 1, wherein the number of the first ferrite (3) and the second ferrite (4) is 16, and the first ferrite and the second ferrite are uniformly distributed on two sides of the annular concentration structure (5).

3. Shielding layer structure according to claim 2, characterized in that the second ferrite (4) is symmetrically arranged on both sides of the first ferrite (3).

4. A shielding layer structure according to claim 3, characterized in that the thickness of the first ferrite (3) is 2-5 mm.

5. Shielding layer structure according to claim 4, wherein the length of the first ferrite (3) is equal to 2 times the width of the coil adjacent thereto, said coil width being the difference between the outer diameter and the inner diameter of the coil.

6. Shielding layer structure according to claim 5, wherein the thickness of the second ferrite (4) is equal to the height of the coil adjacent thereto.

7. Shielding layer structure according to any of claims 1-6, wherein the second ferrite (4) has a length of 3-5 mm.