Wireless charger

Abstract

The invention relates to the related technical field of chargers, and discloses a wireless charger which comprises a charging box body, an annular magnetic assembly arranged in the charging box body and a charging module arranged in the middle of the annular magnetic assembly, the annular magnetic assembly comprises back iron, magnetic steel and induction magnetic steel, the magnetic steel and the induction magnetic steel are arranged on the back iron, and the back iron is of an open-ring-shaped sheet structure. The back iron is provided with a plurality of magnetic steels, the outer ring edge of the back iron is provided with an outer surrounding edge, the inner ring edge of the back iron is provided with an inner surrounding edge, the outer surrounding edge and the inner surrounding edge enclose to form an open-ring-shaped groove which is used for gathering a magnetic field and is provided with a single-side opening, and the plurality of magnetic steels are arranged in the open-ring-shaped groove. The magnetic force can only be released through the opening between the inner surrounding edge and the outer surrounding edge, the magnetic force is restrained and concentrated, the magnetic attraction effect is better, and lightweight design of the wireless charger and related charging products is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field related to chargers, and more specifically, particularly relates to a wireless charger. Background Art

[0002] With the development of wireless charging technology, since electronic devices using wireless charging technology are very convenient for charging operations, users do not need to connect a charging cable, reducing cable wear, which is beneficial to improving safety and reducing space occupation. More and more existing electronic devices adopt wireless charging technology.

[0003] Existing wireless charging technology includes a charging coil and a receiving coil. The two coils are aligned, and through electromagnetic conversion, the electric quantity on the charging coil is transmitted to the receiving coil, thereby achieving the purpose of wireless charging.

[0004] Wireless charging technology requires the alignment of two coils, so a positioning device is needed. Existing positioning devices include two magnetic force rings used in cooperation, which are respectively arranged on the charging device and the device to be charged. After alignment, the two magnetic force rings attract each other to achieve the positioning effect. However, the existing magnetic force ring structure is relatively simple, the direction of magnetic force release is not concentrated, and the magnetic suction force is insufficient. How to improve the magnetic suction force and reduce the thickness of the magnetic force ring to facilitate the miniaturization and light weight of the product is the technical problem to be solved in this application.

[0005] Therefore, in view of this, research and improvement are carried out on the existing structure, and a wireless charger is provided in order to achieve a more practical purpose. Summary of the Invention

[0006] The present invention provides a wireless charger for overcoming the above defects in the prior art.

[0007] The purpose and efficacy of a wireless charger of the present invention are achieved by the following specific technical means: The present invention provides a wireless charger, including a charging box body, an annular magnetic force assembly arranged in the charging box body, and a charging module arranged in the middle of the annular magnetic force assembly. The annular magnetic force assembly includes a back iron, a magnetic steel and an induction magnetic steel arranged on the back iron. The back iron is an open-ring thin sheet structure, and the outer ring edge of the back iron has an outer peripheral edge, and the inner ring edge of the back iron has an inner peripheral edge. The outer peripheral edge and the inner peripheral edge enclose an open-ring groove with a single-side opening for gathering a magnetic field. A plurality of the magnetic steels are arranged in the open-ring groove. Both the inner peripheral edge and the outer peripheral edge have a notch, and the two notches are aligned to form an induction installation position. The induction magnetic steel is arranged at the induction installation position so that the induction magnetic steel is not blocked by the inner peripheral edge, the outer peripheral edge and the back iron. The induction magnetic steel and the magnetic steel are combined to form a complete ring structure, and the surface of the ring structure is exposed through the single-side opening of the open-ring groove.

[0008] Further technical solution: the magnetic steel is an arc-shaped thin sheet, the magnetic steel is embedded in the open annular groove, and the bottom of the magnetic steel is bonded to the bottom surface of the open annular groove by colloid, so that the upper surface of the magnetic steel is not lower than the open annular groove.

[0009] Further technical solution: the thickness of the magnetic steel is 0.25 mm to 0.45 mm, and the depth of the open annular groove is 0.30 mm to 0.50 mm.

[0010] Further technical solution: the outer peripheral edge and the inner peripheral edge are two concentrically arranged open annular thin sheets, both of the two open annular thin sheets are vertically connected to the bottom surface of the back iron, and the distance between the two open annular thin sheets is kept consistent.

[0011] Further technical solution: the outer peripheral edge and the inner peripheral edge are two concentrically arranged open annular thin sheets, both of the two open annular thin sheets are connected to the bottom surface of the back iron, and the free ends of the two open annular thin sheets that are not connected to the bottom surface of the back iron approach each other and inwardly buckle the top of the magnetic steel.

[0012] Further technical solution: the back iron is integrally formed by stamping an iron plate, and the surface of the back iron is galvanized.

[0013] Further technical solution: the charging box body has a back plate, an annular back adhesive is bonded on the back plate, and the back iron is bonded to the annular back adhesive.

[0014] Further technical solution: a special-shaped back adhesive is also bonded on the surface of the back iron, the special-shaped back adhesive includes an annular back adhesive and two connecting ears, and both of the two connecting ears radially extend outward from the center of the annular back adhesive.

[0015] Further technical solution: the magnetic steel has four magnetic poles, the outer arc of the upper surface of the magnetic steel is the S pole, the inner arc is the N pole, the outer arc of the lower surface of the magnetic steel is the N pole, and the inner arc is the S pole.

[0016] Further technical solution: the magnetic steel has two magnetic poles, the outer arc of the magnetic steel is the S pole, the inner arc is the N pole, or the outer arc of the magnetic steel is the N pole, and the inner arc is the S pole.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By improving the back iron, the back iron has an inner peripheral edge and an outer peripheral edge. The magnetic steel is blocked by the inner peripheral edge and the outer peripheral edge, and the magnetic force can only be released through the opening between the inner peripheral edge and the outer peripheral edge. The magnetic force is constrained and concentrated, resulting in a better magnetic attraction effect. In order to avoid the inner peripheral edge and the outer peripheral edge from blocking the induction magnetic steel and reducing the induction effect, the induction magnetic steel is specially arranged at the unobstructed induction installation position to ensure the induction effect. At the same time, the magnetic attraction effect is strengthened. Under the same magnetic attraction force, the thickness of the magnetic steel can be reduced, thereby reducing the thickness of the combined back iron and magnetic steel, which is beneficial to reducing the thickness of the wireless charger and is conducive to the lightweight design of the wireless charger and related charging products. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] The present invention will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 is a schematic diagram of the overall structure of the first embodiment of the present invention; Figure 2 is Figure 1 a schematic diagram of the structure after removing the magnetic steel and the induction magnetic steel; Figure 3 is Figure 2 a cross-sectional view of; Figure 4 is a schematic diagram of three embodiments of the cross-section of the back iron in the present invention; Figure 5 is a schematic diagram of one of the embodiments of the magnetic steel in the present invention; Figure 6 is a schematic diagram of the first embodiment after the magnetic steel and the open annular groove are combined in the present invention; Figure 7 is a schematic diagram of the second embodiment after the magnetic steel and the open annular groove are combined in the present invention; Figure 8 is a schematic diagram of the third embodiment after the magnetic steel and the open annular groove are combined in the present invention; Figure 9 is a schematic diagram of the back plate in the present invention; Figure 10 a schematic diagram of the back plate and the special-shaped back glue in the present invention; Figure 11 is a schematic diagram of the overall structure of the second embodiment of the present invention; Figure 12 isFigure 11 Schematic structural diagram of removing the magnet and the induction magnet; Figure 13 is Figure 11 Schematic structural diagram of the middle magnet; Figure 14 Schematic structural diagram of the magnet pasted inside the back iron in the present invention.

[0021] Description of reference numerals: Back iron 10; Magnet 11; Induction magnet 12; Peripheral edge 13; Inner peripheral edge 14; Open annular groove 15; Induction installation position 16; Back plate 17; Annular back glue 18; Special-shaped back glue 19; Ring-shaped back glue 20; Connecting ear 21; Outer arc 22; Inner arc 23; Colloid 24. Specific embodiments

[0022] The following further describes in detail the embodiments of the present invention with reference to the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0023] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "back end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Refer to the attachedFigure 1-13 , the present invention provides a wireless charger, comprising a charging box body, an annular magnetic assembly disposed within the charging box body, and a charging module disposed in the middle of the annular magnetic assembly. The annular magnetic assembly includes a back iron 10, a magnet 11 and an induction magnet 12 disposed on the back iron 10. The back iron 10 is an open-ring-shaped thin sheet structure, and the outer ring edge of the back iron 10 has an outer peripheral edge 13, and the inner ring edge of the back iron 10 has an inner peripheral edge 14. The outer peripheral edge 13 and the inner peripheral edge 14 enclose an open-ring-shaped groove 15 with a single-sided opening for concentrating the magnetic field. A plurality of the magnets 11 are arranged in the open-ring-shaped groove 15. Both the inner peripheral edge 14 and the outer peripheral edge 13 have a notch, and the two notches are aligned to form an induction installation position 16. The induction magnet 12 is disposed at the induction installation position 16 so that the induction magnet 12 is not blocked by the inner peripheral edge 14, the outer peripheral edge 13 and the back iron 10. The induction magnet 12 and the magnet 11 are combined to form a complete ring structure, and the surface of the ring structure is exposed through the single-sided opening of the open-ring-shaped groove 15.

[0026] In this embodiment, referring to Figure 1-Figure 3 , the shape of the back iron 10 is a circular ring-shaped sheet, and a notch is opened at one place of the ring. Both the inner peripheral edge 14 and the outer peripheral edge 13 are smooth circular ring sheets, and both the magnet 11 and the induction magnet 12 have smooth inner arc 23-shaped surfaces and outer arc 22-shaped surfaces.

[0027] In other embodiments, referring to Figure 11-Figure 13 , the back iron 10 is a polygonal sheet with a polygonal groove in the center. Both the inner peripheral edge 14 and the outer peripheral edge 13 are polygonal enclosures formed by connecting a plurality of straight plates end to end. The inner and outer side surfaces of the magnet 11 and the induction magnet 12 are vertical surfaces adapted to the inner peripheral edge 14 and the outer peripheral edge 13.

[0028] Preferably, the magnet 11 is an arc-shaped thin sheet, the magnet 11 is embedded in the open-ring-shaped groove 15, and the bottom of the magnet 11 is bonded to the bottom surface of the open-ring-shaped groove 15 by a colloid, so that the upper surface of the magnet 11 is not lower than the open-ring-shaped groove 15.

[0029] Specifically, as shown in (a) of Figure 14 , the lower surface of the magnet 11 is pasted to the bottom surface of the open-ring-shaped groove 15 by a colloid 24, so that the upper surface of the magnet 11 is flush with the upper surface of the back iron 10. As shown in (b) of Figure 14 , the thickness of the colloid 24 is uneven, allowing the upper surface of the magnet 11 to protrude from the upper surface of the back iron 10. The magnet 11 protrudes from the back iron 10 to reduce the distance between the magnet 11 and the device to be attracted and enhance the magnetic force.

[0030] Preferably, the thickness of the magnetic steel 11 is 0.25 mm to 0.45 mm, and the depth of the open ring groove 15 is 0.30 mm to 0.50 mm.

[0031] In one embodiment of the present application, refer to the attached Figure 6 The thickness of the magnetic steel 11 is 0.25 mm, the depth of the open-ring groove 15 is 0.30 mm, the magnetic steel 11 is embedded in the open-ring groove 15, the bottom surface of the magnetic steel 11 is close to the bottom surface of the open-ring groove 15, the surface of the magnetic steel 11 is lower than the opening of the open-ring groove 15, and has a height difference of 0.05 mm to enhance the effect of isolating magnetic lines of force.

[0032] In one embodiment of the present application, refer to the attached Figure 7 The thickness of the magnetic steel 11 is 0.35 mm, and the depth of the open ring groove 15 is 0.40 mm.

[0033] In one embodiment of the present application, refer to the attached Figure 8 The thickness of the magnetic steel 11 is 0.45 mm, and the depth of the open ring groove 15 is 0.50 mm.

[0034] Preferably, the outer peripheral edge 13 and the inner peripheral edge 14 are two open-loop thin sheets arranged concentrically, the two open-loop thin sheets are vertically connected to the bottom surface of the back iron 10, and the distance between the two open-loop thin sheets remains consistent.

[0035] Preferably, the outer edge 13 and the inner edge 14 are two open-loop thin sheets arranged concentrically, both of which are connected to the bottom surface of the back iron 10, and the free ends of the two open-loop thin sheets that are not connected to the bottom surface of the back iron 10 are close to each other and buckled inwardly at the top of the magnetic steel 11; the open-loop groove 15 is cut longitudinally to form a cross-section, and the opening width of the open-loop groove 15 is smaller than the width of the bottom.

[0036] In one embodiment of the present application, refer to the attached Figure 4 , an acute angle is formed between the outer edge 13 and the back iron 10, and an acute angle of the same size is formed between the inner edge 14 and the back iron 10. The thickness of the outer edge 13 and the inner edge 14 remains unchanged and moves toward the center to clamp the magnetic steel 11. This model has a relatively thin thickness of 0.35mm due to the unchanged thickness of the edge, which has a certain elastic force and is convenient for installing the magnetic steel 11.

[0037] In one embodiment of the present application, refer to the attached Figure 4, the outer wall surfaces of the inner peripheral edge 14 and the outer peripheral edge 13 form a right angle with the bottom surface of the back iron 10, and the inner wall surfaces of the inner peripheral edge 14 and the outer peripheral edge 13 form an acute angle with the bottom surface of the back iron 10. The top thickness of the peripheral edge is large, and the bottom thickness near the back iron 10 is small. This embodiment also has the effect of clamping the magnet 11. At the same time, due to the large top thickness of the peripheral edge, the effect of isolating magnetic lines of force is better.

[0038] Preferably, the back iron 10 is integrally formed by stamping an iron plate, and the surface of the back iron 10 is galvanized.

[0039] Preferably, referring to the appendix Figure 9 , the charging box body has a back plate 17, an annular back glue 18 is adhered to the back plate 17, and the back iron 10 is adhered to the annular back glue 18.

[0040] In this embodiment, the back glue uses a blue release film.

[0041] Preferably, a special-shaped back glue 19 is also adhered to the surface of the back iron 10. The special-shaped back glue 19 includes a ring-shaped back glue 20 and two connecting ears 21. Both connecting ears 21 radially extend outward from the center of the ring-shaped back glue 20.

[0042] Specifically, referring to the appendix Figure 10 , the two connecting ears 21 have different shapes. The end of one connecting ear 21 is arc-shaped, and the end of the other connecting ear 21 is rectangular.

[0043] In this embodiment, referring to the appendix Figure 10 , the back plate 17 is rectangular, the ring-shaped back glue 20 is arranged at the center of the rectangle, the connection line of the two connecting ears 21 passes through the center of the circle of the ring-shaped back glue 20, and the connection line of the two connecting ears 21 is inclined so that the connection line forms an angle with the side of the rectangular back plate 17.

[0044] The size of the above angle can be adjusted as needed. For example, a 15-degree angle is used in this embodiment, and a 20-degree angle can also be used in other embodiments. As long as an inclined setting can be formed, it has an offset effect and can distinguish directions to achieve anti-fooling.

[0045] In an embodiment of the present application, referring to the appendix Figure 6 , the magnet 11 has four magnetic poles. The outer arc 22 on the upper surface of the magnet 11 is the S pole, and the inner arc 23 is the N pole. The outer arc 22 on the lower surface of the magnet 11 is the N pole, and the inner arc 23 is the S pole.

[0046] In another embodiment of the present application, referring to the appendix Figure 5 , the magnet 11 has two magnetic poles. The outer arc 22 of the magnet 11 is the S pole, and the inner arc 23 is the N pole.

[0047] In another embodiment of the present application, the permanent magnet 11 has two magnetic poles, the outer arc 22 of the permanent magnet 11 is an N pole, and the inner arc 23 is an S pole.

[0048] Embodiments of the present invention are provided for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A wireless charger, comprising a charging box, an annular magnetic assembly arranged in the charging box, and a charging module arranged in the middle of the annular magnetic assembly, characterized in that: The annular magnetic component includes a back iron and a magnetic steel and an induction magnetic steel arranged on the back iron, the back iron is an open-ring thin sheet structure, and the outer ring edge of the back iron has an outer peripheral edge, and the inner ring edge of the back iron has an inner peripheral edge, the outer peripheral edge and the inner peripheral edge together form an open-ring groove with a single-side opening that gathers the magnetic field, a plurality of magnetic steels are arranged in the open-ring groove, the inner peripheral edge and the outer peripheral edge each have a notch, and the two notches are aligned to form an induction mounting position, the induction magnetic steel is arranged at the induction mounting position so that the induction magnetic steel is not blocked by the inner peripheral edge, the outer peripheral edge and the back iron, the induction magnetic steel and the magnetic steel are combined to form a complete circular ring structure, and the surface of the circular ring structure is exposed through the single-side opening of the open-ring groove.

2. A wireless charger according to claim 1, characterized in that: The magnetic steel is an arc-shaped thin sheet, which is embedded in the open-ring groove, and the bottom of the magnetic steel is bonded to the bottom surface of the open-ring groove by colloid so that the upper surface of the magnetic steel is not lower than the open-ring groove.

3. A wireless charger according to claim 2, characterized in that: The thickness of the magnetic steel is 0.25 mm to 0.45 mm, and the depth of the open ring groove is 0.30 mm to 0.50 mm.

4. A wireless charger according to claim 1, characterized in that: The outer peripheral edge and the inner peripheral edge are two open-loop thin sheets arranged concentrically, the two open-loop thin sheets are vertically connected to the bottom surface of the back iron, and the distance between the two open-loop thin sheets remains consistent.

5. A wireless charger according to claim 1, characterized in that: The outer edge and the inner edge are two open-loop thin sheets arranged concentrically, and both open-loop thin sheets are connected to the bottom surface of the back iron. The free ends of the two open-loop thin sheets that are not connected to the bottom surface of the back iron are close to each other and buckled inwardly at the top of the magnetic steel.

6. A wireless charger according to any one of claims 1 to 5, characterized in that: The back iron is formed in one piece by stamping an iron plate, and the surface of the back iron is galvanized.

7. A wireless charger according to any one of claims 1 to 5, characterized in that: The charging box body has a back plate, the back plate is bonded with an annular adhesive, and the back iron is bonded to the annular adhesive.

8. A wireless charger according to claim 7, characterized in that: The back iron surface is also bonded with a special-shaped back glue, and the special-shaped back glue includes an annular back glue and two connecting ears, and the two connecting ears both extend radially outward from the center of the annular back glue.

9. The wireless charger according to claim 1, characterized in that: The magnetic steel has four magnetic poles, the outer arc of the upper surface of the magnetic steel is an S pole, and the inner arc is an N pole, and the outer arc of the lower surface of the magnetic steel is an N pole, and the inner arc is an S pole.

10. The wireless charger according to claim 1, characterized in that: The magnetic steel has two magnetic poles, the outer arc of the magnetic steel is an S pole, and the inner arc is an N pole, or the outer arc of the magnetic steel is an N pole, and the inner arc is an S pole.

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