CN113422438A - Wireless charging electromagnetic positioning structure, wireless charging module and wireless charger - Google Patents

Abstract

The invention discloses a wireless charging magnetic positioning structure, a wireless charging module and a wireless charger.A first magnet and a second magnet are alternately arranged around a wireless charging coil to form a ring shape, and the magnetizing directions of the first magnet and the second magnet are opposite, so that the first magnet at a transmitting end and the first magnet at a receiving end, and the second magnet at the transmitting end and the second magnet at the receiving end form a closed loop of magnetic lines of force, thereby improving the magnetic attraction between the transmitting end and the receiving end; the magnetizing directions of the adjacent first magnet and the second magnet are opposite, so that the magnetic attraction force generated by the magnets at the transmitting end and the receiving end is larger, and the influence on the magnetic force line of the module is smaller; simultaneously because first magnet and second magnet set up in wireless charging coil outside, form inseparable and closed magnetic line of force between the two, consequently magnetic line of force of magnetism location structure can not cause great influence to wireless charging coil's internal magnetic field to improve wireless charging efficiency.

Description

Wireless charging electromagnetic positioning structure, wireless charging module and wireless charger

Technical Field

The invention relates to the technical field of wireless charging magnetic positioning, in particular to a wireless charging magnetic positioning structure, a wireless charging module and a wireless charger.

Background

Wireless charging technology (Wireless charging technology) is derived from Wireless power transmission technology, and can be divided into two modes of low-power Wireless charging and high-power Wireless charging. The low-power wireless charging is realized by adopting an electromagnetic induction mode, and is applied to charging scenes of mobile terminals such as mobile phones. High-power wireless charging usually adopts magnetic field resonance's mode to realize wireless charging, is applied to fields such as electric automobile, but two kinds of wireless charging techniques all relate to the magnetic localization technique. With the development and progress of the technology, the use of the wireless charging technology is gradually widespread, and higher requirements are also put forward on the wireless charging technology. Particularly, regarding the efficiency of wireless charging, the key point affecting the efficiency of wireless charging is whether the coil positions are aligned when the transmitting end and the receiving end are coupled for charging.

Currently, magnetic positioning technology is usually adopted to achieve the position alignment of the transmitting end and the receiving end. However, the existing magnetic positioning technology is single in mode, only the initial matching of the coil position can be realized, and although the charging efficiency is relatively improved in a wireless charging mode without a magnetic positioning structure, the problem of inaccurate positioning still exists.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides a wireless electromagnetism location structure, wireless module and wireless charger that charge, can realize the accurate location between the wireless charging coil, improve charge efficiency.

In order to solve the technical problems, the invention adopts the technical scheme that:

a wireless charging electromagnetic positioning structure comprises a first magnet and a second magnet;

the first magnet and the second magnet are alternately arranged around the wireless charging coil to form a ring shape;

the magnetizing directions of the first magnet and the second magnet are opposite.

In order to solve the technical problem, the invention adopts another technical scheme as follows:

a wireless module that charges, includes wireless charging coil and the above-mentioned wireless magnetism location structure that charges.

In order to solve the technical problem, the invention adopts another technical scheme as follows:

a wireless charger comprises a transmitting end and a receiving end;

the transmitting end and the receiving end both comprise the wireless charging module;

the magnetizing direction of the first magnet of the transmitting end is parallel to the magnetizing direction of the first magnet of the receiving end;

the magnetizing direction of the second magnet of the transmitting end is parallel to the magnetizing direction of the second magnet of the receiving end.

The invention has the beneficial effects that: the first magnet and the second magnet are alternately arranged around the wireless charging coil to form an annular shape, and the magnetizing directions of the first magnet and the second magnet are opposite, so that the first magnet at the transmitting end and the first magnet at the receiving end, and the second magnet at the transmitting end and the second magnet at the receiving end form a closed loop of magnetic lines of force, and the magnetic attraction force of the transmitting end and the receiving end is improved; the magnetizing directions of the adjacent first magnet and the second magnet are opposite, so that the magnetic attraction force generated by the magnets at the transmitting end and the receiving end is larger, and the influence on the magnetic force line of the module is smaller; simultaneously because first magnet and second magnet set up in wireless charging coil outside, form inseparable and closed magnetic line of force between the two, consequently magnetic line of force of magnetism location structure can not cause great influence to wireless charging coil's internal magnetic field to improve wireless charging efficiency.

Drawings

Fig. 1 is a schematic diagram of a wireless charging electromagnetic positioning structure according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an axial magnetization structure diagram of a wireless magnetization and electromagnetic positioning structure according to an embodiment of the present invention;

fig. 3 is a schematic diagram of another wireless charging magnetic positioning structure according to an embodiment of the present invention;

fig. 4 is a schematic view of a radial magnetizing structure of another wireless charging magnetic positioning structure according to an embodiment of the present invention;

FIG. 5 is a magnetic field line distribution diagram corresponding to the structure of FIG. 4;

fig. 6 is a schematic view of an axial magnetization structural diagram of another wireless charging magnetic positioning structure according to an embodiment of the present invention;

FIG. 7 is a magnetic field line distribution diagram corresponding to the structure of FIG. 6;

fig. 8 is a schematic top view illustrating a wireless charging module according to an embodiment of the present invention;

fig. 9 is a schematic front view of a wireless charging module according to an embodiment of the present invention;

fig. 10 is a schematic view of a magnetic positioning structure of a wireless charger according to an embodiment of the present invention;

fig. 11 is a schematic view of a radial magnetizing structure of a wireless charger according to an embodiment of the present invention;

fig. 12 is a schematic view of an axial magnetizing structure of a wireless charger according to an embodiment of the present invention;

FIG. 13 is a comparison of magnetic attraction forces of magnetic alignment structures included in samples 1 and 2 according to an embodiment of the present invention;

description of reference numerals:

1. a first magnet; 11. a first sub-magnet; 12. a second sub-magnet; 2. a second magnet; 21. a third sub-magnet; 22. a fourth sub-magnet; 3. a magnetic conductive sheet; 4. a charging coil; 5. a magnetic shield sheet; 6. a first gap; 7. a receiving end; 8. and a transmitting end.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1, a wireless charging electromagnetic positioning structure includes a first magnet and a second magnet;

the first magnet and the second magnet are alternately arranged around the wireless charging coil to form a ring shape;

the magnetizing directions of the first magnet and the second magnet are opposite.

From the above description, the beneficial effects of the present invention are: the first magnet and the second magnet are alternately arranged around the wireless charging coil to form an annular shape, and the magnetizing directions of the first magnet and the second magnet are opposite, so that the first magnet at the transmitting end and the first magnet at the receiving end, and the second magnet at the transmitting end and the second magnet at the receiving end form a closed loop of magnetic lines of force, and the magnetic attraction force of the transmitting end and the receiving end is improved; the magnetizing directions of the adjacent first magnet and the second magnet are opposite, so that the magnetic attraction force generated by the magnets at the transmitting end and the receiving end is larger, and the influence on the magnetic force line of the module is smaller; simultaneously because first magnet and second magnet set up in wireless charging coil outside, form inseparable and closed magnetic line of force between the two, consequently magnetic line of force of magnetism location structure can not cause great influence to wireless charging coil's internal magnetic field to improve wireless charging efficiency.

Further, the first magnet includes a first sub-magnet and a second sub-magnet;

the second magnet comprises a third sub-magnet and a fourth sub-magnet;

the first sub-magnet and the third sub-magnet form a first closed loop;

the second sub-magnet and the fourth sub-magnet form a second closed loop;

the first closed loop with be provided with the magnetic conduction piece between the second closed loop, just the first closed loop is located one side that the magnetic conduction piece is close to wireless charging coil, the second closed loop is located one side that wireless charging coil was kept away from to the magnetic conduction piece.

As can be seen from the above description, by disposing the magnetic conductive sheet between the first closed loop formed by the first sub-magnet and the third sub-magnet and the second closed loop formed by the second sub-magnet and the fourth sub-magnet, a magnetic circuit which is easier to conduct can be provided for the magnetic lines of force between the first sub-magnet and the second sub-magnet and the magnetic lines of force between the third sub-magnet and the fourth sub-magnet, so that the first sub-magnet and the second sub-magnet and the third sub-magnet and the fourth sub-magnet are easier to form a close closed loop magnetic line of force.

Further, the magnetic permeability of the magnetic conductive sheet is smaller than a preset value.

According to the description, the material with the magnetic conductivity smaller than the preset value is used as the magnetic conductive sheet, so that the interference of the material with high magnetic conductivity on electromagnetic conversion between the transmitting end and the receiving end is avoided, the inductance value of the equipment is influenced, and the positioning accuracy of the equipment is improved.

Further, the first magnet and the second magnet are both magnetized in the radial direction;

the magnetizing directions of the first sub-magnet and the second sub-magnet are the same;

the magnetizing directions of the third sub-magnet and the fourth sub-magnet are the same;

the magnetizing directions of the first sub-magnet and the third sub-magnet are opposite.

As can be seen from the above description, when the first magnet and the second magnet are magnetized in the radial direction, the magnetizing directions of the first sub-magnet and the second sub-magnet are the same, the magnetizing directions of the third sub-magnet and the fourth sub-magnet are the same, and the magnetizing directions of the first sub-magnet and the third sub-magnet are opposite, so that the first sub-magnet and the second sub-magnet are conducted through the magnetic circuit of the middle magnetic conductive sheet, and then form a closed loop of magnetic lines of force with the first sub-magnet and the second sub-magnet at the receiving end, thereby improving the magnetic attraction force between the magnet at the transmitting end and the magnet at the receiving end; similarly, the third sub-magnet of transmitting terminal switches on through middle magnetic conduction piece magnetic circuit with the fourth sub-magnet, form the closed and return circuit of magnetic line of force with the third sub-magnet of receiving terminal again with the fourth sub-magnet, thereby improve the magnetic attraction of transmitting terminal magnet and receiving terminal magnet, and adjacent first sub-magnet and third sub-magnet, and adjacent second magnet and fourth magnet opposite direction, make the magnetic attraction that transmitting terminal and receiving terminal magnet produced than the magnetic attraction when syntropy set up bigger, and influence littleer to the magnetic line of force of module.

Further, the first magnet and the second magnet are axially magnetized;

the magnetizing directions of the first sub-magnet and the second sub-magnet are opposite;

the magnetizing directions of the third sub-magnet and the fourth sub-magnet are opposite;

the magnetizing directions of the first sub-magnet and the third sub-magnet are opposite.

It can be known from the above description that, when the first magnet and the second magnet are axially magnetized, the magnetizing directions of the first sub magnet and the second sub magnet are opposite, the magnetizing directions of the third sub magnet and the fourth sub magnet are opposite, and the magnetizing directions of the first sub magnet and the third sub magnet are opposite, so that the first magnet and the second magnet can form a closed loop magnetic line, and meanwhile, a closed loop magnetic line can be formed between the adjacent first sub magnet and the third sub magnet and between the adjacent second sub magnet and the fourth sub magnet, so that a tight closed loop magnetic line is formed between the first magnet at the transmitting end and the first magnet at the receiving end and between the second magnet at the transmitting end and the second magnet at the receiving end, thereby greatly improving the magnetic attraction of the magnetic positioning structure, and achieving the position alignment of the wireless charging coupling coil more accurately.

Referring to fig. 9, a wireless charging module includes a wireless charging coil and the wireless charging magnetic positioning structure.

Further, the magnetic shield also comprises a magnetic shield sheet;

the magnetic separation sheet is attached to one side, close to the wireless charging coil, of the wireless charging electromagnetic positioning structure.

It can be known from the above description that through setting up the magnetic separation piece can gather together the magnetic flux of induction field between the coupling coil to the magnetic induction intensity of reinforcing receiving end coil, simultaneously, reduce electromagnetic signal's decay on the one hand, improve the electromagnetic conversion efficiency in the wireless charging, on the other hand, reduce the magnetic line of force that magnetism location structure produced to the electromagnetic interference of other metals and components and parts in transmitting terminal and the receiving terminal.

Furthermore, a first gap is formed between the first magnet and the magnetic separation sheet.

According to the above description, because first magnet, second magnet and separate the magnetic sheet and all adopted magnetic material, have the clearance through setting up first magnet and separate the magnetic sheet and second magnet and separate between the magnetic sheet, can avoid the magnetic material contact to reduce the interference that closed circuit magnetic force line that forms between first magnet and the second magnet caused wireless charging coil magnetic flux.

Referring to fig. 10, a wireless charger includes a transmitting end and a receiving end;

the transmitting end and the receiving end both comprise the wireless charging module;

the magnetizing direction of the first magnet of the transmitting end is parallel to the magnetizing direction of the first magnet of the receiving end;

the magnetizing direction of the second magnet of the transmitting end is parallel to the magnetizing direction of the second magnet of the receiving end.

It can be known from the above description, the direction of magnetizing through the first magnet with the transmitting terminal is parallel with the direction of magnetizing of the first magnet of receiving terminal, the direction of magnetizing of the second magnet of transmitting terminal is parallel with the direction of magnetizing of the second magnet of receiving terminal, can make between the first magnet of transmitting terminal and the first magnet of receiving terminal and between the second magnet of transmitting terminal and the second magnet of receiving terminal form inseparable closed loop magnetic line of force, thereby improve magnetic localization mechanism's magnetic attraction greatly, can be more accurate realize the position alignment of wireless charging coupling coil.

Further, the magnetizing directions of the first magnet and the second magnet are axial magnetizing;

the magnetizing directions of the first magnet of the transmitting end and the first magnet of the receiving end are the same; the second magnet of the transmitting end and the second magnet of the receiving end have the same magnetizing direction.

It can be known from the above description that, when the magnetization directions of the first magnet and the second magnet are axial magnetization, the magnetization directions of the first magnet at the transmitting end and the first magnet at the receiving end are set to be the same, and the magnetization directions of the second magnet at the transmitting end and the second magnet at the receiving end are set to be the same, so that a tight closed loop magnetic line is formed between the first magnet at the transmitting end and the first magnet at the receiving end and between the second magnet at the transmitting end and the second magnet at the receiving end, thereby accurately positioning the wireless charging terminal.

Further, the magnetizing directions of the first magnet and the second magnet are radial magnetizing;

the magnetizing directions of the first magnet of the transmitting end and the first magnet of the receiving end are opposite; and the magnetizing directions of the second magnet of the transmitting end and the second magnet of the receiving end are opposite.

As can be seen from the above description, when the magnetizing directions of the first magnet and the second magnet are radial magnetizing, the magnetizing directions of the first magnet at the transmitting end and the first magnet at the receiving end are set to be opposite, and the magnetizing directions of the second magnet at the transmitting end and the second magnet at the receiving end are set to be opposite, so that a tight closed-loop magnetic line is formed between the first magnet at the transmitting end and the first magnet at the receiving end and between the second magnet at the transmitting end and the second magnet at the receiving end, thereby accurately positioning the wireless charging terminal.

The wireless charging electromagnetic positioning structure, the wireless charging module and the wireless charger are suitable for any application scene needing wireless charging, such as wireless charging of wearable intelligent terminals such as mobile phones, earphones and watches, wireless charging of intelligent homes, wireless charging of electric vehicles and the like, and are explained by specific implementation modes as follows:

example one

Referring to fig. 1, a wireless charging electromagnetic positioning structure includes a first magnet 1 and a second magnet 2;

referring to fig. 2, the first magnet 1 and the second magnet 2 are arranged around the wireless charging coil 4 at intervals to form a ring shape; the magnetizing directions of the first magnet 1 and the second magnet 2 are opposite;

the ring shape in the embodiment includes hollow closed shapes such as a rectangular ring, a circular ring and the like; the shapes of the first magnet 1 and the second magnet 2 can be set according to actual requirements, such as a ring shape, a square shape, other symmetrical or asymmetrical opposite shapes;

in an alternative embodiment, referring to fig. 3, the first magnet 1 includes a first sub-magnet 11 and a second sub-magnet 12; the second magnet 2 comprises a third sub-magnet 21 and a fourth sub-magnet 22; the first sub-magnet 11 and the third sub-magnet 21 form a first closed loop; the second sub-magnet 12 and the fourth sub-magnet 22 form a second closed loop; a magnetic conductive sheet 3 is arranged between the first closed loop and the second closed loop, the first closed loop is positioned on one side, close to the wireless charging coil 4, of the magnetic conductive sheet 3, and the second closed loop is positioned on one side, far away from the wireless charging coil 4, of the magnetic conductive sheet 3; the first sub-magnets 11, the second sub-magnets 12, the third sub-magnets 21 and the fourth sub-magnets 22 are the same in number, and the number, the shape and the size of the first sub-magnets, the second sub-magnets, the third sub-magnets and the fourth sub-magnets can be set according to actual application scenes; if the application scene is a mobile terminal such as a mobile phone, the number, the shape and the size can be properly reduced; if the application scene is large-scale equipment such as an intelligent home, the number, the shape and the size can be properly increased;

in an optional embodiment, the magnetic conductive sheet 3 may be a permanent magnet material, a soft magnetic material, or the like with low magnetic permeability and low residual magnetism, such as a permanent magnet stainless steel sheet, silicon steel, or the like; the magnetic conductivity range is as follows: 10-8000, the magnetic attraction is larger when the magnetic conductivity is smaller in the range; the magnetic conductive sheet 3 with high magnetic conductivity can also provide a magnetic circuit which is easier to conduct, but the electromagnetic conversion between the receiving end 7 and the sending end in the charging module is interfered due to the overhigh magnetic conductivity, so that the inductance value of the module is influenced, and the positioning accuracy is reduced;

in an alternative embodiment, the adjacent first sub-magnet 11 and the third sub-magnet 21 are closely attached, and the adjacent second sub-magnet 12 and the fourth sub-magnet 22 are closely attached; when the inner and outer diameters of the first magnet 1 and the second magnet 2 are fixed, the adjacent first sub-magnet 11 and the third sub-magnet 21 are closely attached, and the adjacent second sub-magnet 12 and the fourth sub-magnet 22 are closely attached, so that the effective areas of the first magnet 1 and the second magnet 2 can be increased, and the magnetic attraction force of the magnetic positioning structure can be increased;

in an alternative embodiment, the first magnet 1 and the second magnet 2 may be made of magnetic materials with different shapes and different sizes, such as neodymium-iron-boron permanent magnet, samarium-cobalt or permanent ferrite material.

Example two

The present embodiment is different from the first embodiment in that the present embodiment defines the magnetizing directions of the first magnet 1 and the second magnet 2;

referring to fig. 4, when the first magnet 1 and the second magnet 2 are both magnetized in the radial direction, the magnetizing directions of the first sub-magnet 11 and the second sub-magnet 12 are the same; the magnetizing directions of the third sub-magnet 21 and the fourth sub-magnet 22 are the same; the magnetizing directions of the first sub-magnet 11 and the third sub-magnet 21 are opposite;

specifically, the radial magnetizing direction of the first magnet 1 is a direction from the direction of the first closed loop to the direction of the second closed loop; the radial magnetizing direction of the second magnet 2 is the direction from the direction of the second closed loop to the direction of the first closed loop; the side of the first sub-magnet 11 away from the magnetic conductive plate 3 is an N pole, the side of the second sub-magnet 12 away from the magnetic conductive plate 3 is an S pole, the side of the third sub-magnet 21 away from the magnetic conductive plate 3 is an S pole, and the side of the fourth sub-magnet 22 away from the magnetic conductive plate 3 is an N pole; referring to fig. 5, a radial magnetizing magnetic force line distribution diagram shows that the magnetic force line density of the magnetic positioning structure in the drawing is large, the magnetic circuit is short, the magnetic force line generated by the first sub-magnet 11 and the magnetic force line generated by the second sub-magnet 12 in the transmitting end 8 and the receiving end 7 form a tight closed loop through the middle magnetic conductive sheet 3, the magnetic force line generated by the third sub-magnet 21 and the magnetic force line generated by the fourth sub-magnet 22 form a tight closed loop through the middle magnetic conductive sheet 3, and a tight closed loop is also formed between the adjacent first magnet 1 and the second magnet 2, so that the magnetic attraction of the magnetic positioning structure is increased, and meanwhile, the magnetic leakage of the tight closed loop is less, and the influence on other components in the transmitting end 8 and the receiving end is greatly reduced;

referring to fig. 6, when the first magnet 1 and the second magnet 2 are axially magnetized, the magnetizing directions of the first sub-magnet 11 and the second sub-magnet 12 are opposite; the magnetizing directions of the third sub-magnet 21 and the fourth sub-magnet 22 are opposite; the magnetizing directions of the first sub-magnet 11 and the third sub-magnet 21 are opposite;

specifically, the axial direction of the first sub-magnet 11 is from the top to the bottom along the axial direction, and is an N pole along the axial direction, and is an S pole along the axial direction; the axial magnetizing direction of the second sub-magnet 12 is from the axial direction to the downward direction, the axial direction is the S pole, and the axial direction is the N pole; the axial magnetizing direction of the third sub-magnet 21 is from the axial direction to the downward direction, the axial direction is the S pole, and the axial direction is the N pole; the axial magnetizing direction of the fourth sub-magnet 22 is from the top to the bottom along the axial direction, the N pole is along the axial direction, and the S pole is along the axial direction; referring to fig. 7, it is a distribution diagram of magnetic lines of force for axial magnetization, in the diagram, the magnetic lines of force of the magnetic positioning structure have a relatively high density and a relatively short magnetic circuit, the magnetic lines of force generated by the first sub-magnet 11 and the magnetic lines of force generated by the second sub-magnet 12 in the transmitting end 8 and the receiving end 7 form a tight closed loop through the middle magnetic conductive sheet 3, the magnetic lines of force generated by the third sub-magnet 21 and the magnetic lines of force generated by the fourth sub-magnet 22 form a tight closed loop through the middle magnetic conductive sheet 3, and a tight closed loop is also formed between the adjacent first magnet 1 and the second magnet 2, so that the magnetic attraction of the magnetic positioning structure is increased, and meanwhile, the leakage of the tight closed loop is relatively small, and the influence on other components in the transmitting end 8 and the receiving end is greatly reduced.

EXAMPLE III

Referring to fig. 8 and 9, a wireless charging module includes the wireless charging electromagnetic positioning structure in the first embodiment or the second embodiment;

also comprises a magnetic separation sheet 5; the magnetic separation sheet 5 is attached to one side, close to the wireless charging magnetic positioning structure, of the wireless charging coil 4; the wireless charging coil 4 is a copper coil, and the specification and size are determined by the design requirements of products;

in an optional embodiment, the wireless charging coil 4 is used for releasing electric energy and converting the electric energy into magnetic energy, and the material of the magnetic separation sheet 5 correspondingly attached to the wireless charging coil comprises a soft magnetic ferrite, an amorphous, a nanocrystalline, a permalloy or a silicon steel soft magnetic material with a certain thickness;

in another optional embodiment, the wireless charging coil 4 is configured to receive magnetic energy and convert the magnetic energy into electric energy, and the material of the magnetic separation sheet 5 correspondingly attached to the wireless charging coil includes at least one layer of a nanocrystalline strip, an amorphous strip, a soft magnetic ferrite, a permalloy, or other metal soft magnetic material;

a first gap 6 is formed between the wireless charging electromagnetic positioning structure and the magnetic separation sheet 5; specifically, the inner diameter of the first closed loop is larger than the outer diameter of the magnetism isolating sheet 5.

Example four

A wireless charger comprises a transmitting end 8 and a receiving end 7;

the transmitting end 8 and the receiving end 7 both comprise the wireless charging module;

the magnetizing direction of the first magnet 1 of the transmitting terminal 8 is parallel to the magnetizing direction of the first magnet 1 of the receiving terminal 7; the magnetizing direction of the second magnet 2 of the transmitting terminal 8 is parallel to the magnetizing direction of the second magnet 2 of the receiving terminal 7;

referring to fig. 11, in an alternative embodiment, when the magnetizing directions of the first magnet 1 and the second magnet 2 are radial magnetizing, the magnetizing directions of the first magnet 1 and the second magnet 2 of the transmitting terminal 8 are respectively opposite to the magnetizing directions of the first magnet 1 and the second magnet 2 of the receiving terminal 7;

referring to fig. 12, in another alternative embodiment, when the magnetization directions of the first magnet 1 and the second magnet 2 are axial magnetization, the magnetization directions of the first magnet 1 and the second magnet 2 of the transmitting end 8 are respectively the same as the magnetization directions of the first magnet 1 and the second magnet 2 of the receiving end 7;

in order to verify the beneficial performance of the invention, the charger which is manufactured under the non-optimal condition in the first embodiment and the wireless charger which is manufactured under the fourth embodiment are used as samples to respectively test the magnetic attraction force and compare the magnetic attraction force;

sample 1 is a non-preferred charger of example one; sample 2 was the charger described in example four; referring to fig. 13, adjusting the distance between the transmitting end 8 and the receiving end 7 to increase from 0mm to 2mm, the magnetic attraction forces of the magnetic positioning structures in the sample 1 and the sample 2 are both gradually decreased, and a comparison graph of the magnetic attraction forces of the magnetic positioning structures in the sample 1 and the sample 2 is shown in fig. 13; it can be seen from the contrast picture that sample 1's magnetic attraction will be big than sample 2's magnetic attraction all the time, more can make the more accurate realization position alignment of module coupling coil that charges to improve charge efficiency.

In summary, according to the wireless charging electromagnetic positioning structure, the wireless charging module and the wireless charger provided by the present invention, the first magnet and the second magnet are alternately arranged around the wireless charging coil to form a ring shape, and the magnetizing directions of the first magnet and the second magnet are opposite, so that a closed loop magnetic line of force can be formed between the adjacent first magnet and second magnet, the density of the magnetic line of force between the first magnet and the second magnet is increased, and the first magnet and the third magnet form a first closed loop, the second magnet and the fourth magnet form a second closed loop, a magnetic conductive sheet with lower magnetic conductivity is arranged between the first closed loop and the second closed loop, so that the first magnet and the second magnet at the transmitting end are conducted through a magnetic conductive sheet magnetic circuit in the middle, and then are conducted with the first magnet and the second magnet at the receiving end (both are also conducted through the middle magnetic conductive sheet) to form a closed loop of the magnetic line of force, thereby improving the magnetic attraction between the transmitting end magnet and the receiving end magnet; similarly, the third sub-magnet and the fourth sub-magnet of the transmitting end are conducted through a magnetic circuit of the middle magnetic conductive sheet and form a closed loop of magnetic lines of force with the third sub-magnet and the fourth sub-magnet of the receiving end, so that the magnetic attraction force between the transmitting end magnet and the receiving end magnet is improved, the adjacent first sub-magnet and the third sub-magnet are opposite to the adjacent second magnet and the fourth sub-magnet in direction, the magnetic attraction force generated by the transmitting end magnet and the receiving end magnet is larger than the magnetic attraction force generated by the transmitting end magnet and the receiving end magnet when the transmitting end magnet and the receiving end magnet are arranged in the same direction, the influence on the magnetic lines of force of the module is smaller, the magnetic attraction force of the magnetic positioning structure is greatly improved, the position alignment of the wireless charging coupling coil can be more accurately realized, the interference of high-permeability materials on the electromagnetic conversion between; simultaneously because first magnet and second magnet set up in wireless charging coil outside, form inseparable and closed magnetic line of force between the two, consequently magnetic line of force of magnetism location structure can not cause great influence to wireless charging coil's internal magnetic field to improve wireless charging efficiency.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims (11)

1. A wireless charging electromagnetic positioning structure is characterized by comprising a first magnet and a second magnet;

the first magnet and the second magnet are arranged around the wireless charging coil at intervals to form a ring shape;

the magnetizing directions of the first magnet and the second magnet are opposite.

2. The wireless charging electromagnetic positioning structure of claim 1, wherein the first magnet comprises a first sub-magnet and a second sub-magnet;

the second magnet comprises a third sub-magnet and a fourth sub-magnet;

the first sub-magnet and the third sub-magnet form a first closed loop;

the second sub-magnet and the fourth sub-magnet form a second closed loop;

the first closed loop with be provided with the magnetic conduction piece between the second closed loop, just the first closed loop is located one side that the magnetic conduction piece is close to wireless charging coil, the second closed loop is located one side that wireless charging coil was kept away from to the magnetic conduction piece.

3. The wireless charging electromagnetic positioning structure of claim 2, wherein the magnetic permeability of the magnetic conductive sheet is less than a predetermined value.

4. The wirelessly charged electromagnetic positioning structure of claim 2, wherein the first magnet and the second magnet are both radially charged;

the magnetizing directions of the first sub-magnet and the second sub-magnet are the same;

the magnetizing directions of the third sub-magnet and the fourth sub-magnet are the same;

the magnetizing directions of the first sub-magnet and the third sub-magnet are opposite.

5. The wirelessly charged electromagnetic positioning structure of claim 2, wherein the first magnet and the second magnet are axially magnetized;

the magnetizing directions of the first sub-magnet and the second sub-magnet are opposite;

the magnetizing directions of the third sub-magnet and the fourth sub-magnet are opposite;

the magnetizing directions of the first sub-magnet and the third sub-magnet are opposite.

6. A wireless charging module, characterized in that, includes wireless charging coil and the wireless electromagnetic positioning structure that fills of any one of claims 1 to 5.

7. The wireless charging module of claim 6, further comprising a magnetic shield;

the magnetic separation sheet is attached to one side, close to the wireless charging coil, of the wireless charging electromagnetic positioning structure.

8. The wireless charging module of claim 7, wherein a first gap is formed between the wireless charging electromagnetic positioning structure and the magnetic shielding sheet.

9. A wireless charger is characterized by comprising a transmitting end and a receiving end;

the transmitting end and the receiving end both comprise the wireless charging module of any one of claims 6-8;

the magnetizing direction of the first magnet of the transmitting end is parallel to the magnetizing direction of the first magnet of the receiving end;

the magnetizing direction of the second magnet of the transmitting end is parallel to the magnetizing direction of the second magnet of the receiving end.

10. The wireless charger of claim 9, wherein the first magnet and the second magnet are magnetized in an axial direction;

the magnetizing directions of the first magnet of the transmitting end and the first magnet of the receiving end are the same; the second magnet of the transmitting end and the second magnet of the receiving end have the same magnetizing direction.

11. The wireless charger of claim 9, wherein the first magnet and the second magnet are radially magnetized;

the magnetizing directions of the first magnet of the transmitting end and the first magnet of the receiving end are opposite; and the magnetizing directions of the second magnet of the transmitting end and the second magnet of the receiving end are opposite.

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