Vehicle-mounted wireless charger

Abstract

The invention relates to the related technical field of chargers, and discloses a vehicle-mounted wireless charger which comprises a vehicle-mounted charging shell, a magnetic attraction ring arranged in the vehicle-mounted charging shell and a charging module arranged in the middle of the magnetic attraction ring, the magnetic attraction ring comprises annular back iron, magnetic steel and induction magnetic steel, the magnetic steel and the induction magnetic steel are arranged on the annular back iron, and the annular back iron is provided with an annular groove; the plurality of magnetic steels are arranged in the annular groove and are connected end to end to form an open-loop structure, the induction magnetic steels are arranged at the vacancy of the open-loop structure to form a complete magnetic ring, the inner ring parts of the magnetic steels are inner arc magnets, the outer ring parts of the magnetic steels are outer arc magnets, and the middle parts of the magnetic steels are non-magnetic areas; the magnetizing directions of the inner arc magnet and the outer arc magnet are both axial, the magnetic pole directions of the inner arc magnet and the outer arc magnet are opposite, and the magnetic lines are distributed more uniformly by improving the structure of the magnetic suction ring and adopting the multi-magnetic-pole design.

Description

Technical Field

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

[0002] With the development of wireless charging technology, more and more existing electronic devices are adopting wireless charging technology because electronic devices using wireless charging technology are very convenient for charging operations. Users do not need to connect charging cables, which reduces cable wear, helps improve safety, and reduces space occupancy.

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

[0004] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art: Traditional car wireless charger magnetic rings usually use a single magnetic steel structure with uneven magnetic force distribution, which can easily cause the device to shift during charging and affect the charging efficiency. In addition, the existing magnetic ring design has deficiencies in the closure and magnetic force distribution of the magnetic ring, resulting in greater electromagnetic interference and poor charging stability during charging. Therefore, how to optimize the structural design of the magnetic ring and improve charging efficiency and stability has become a technical problem that needs to be urgently solved in the field of car wireless charging technology.

[0005] Wireless charging technology requires that two coils be aligned. In view of this, an existing structure is studied and improved to provide a vehicle-mounted wireless charger in order to achieve a more practical purpose. Summary of the invention

[0006] The present invention provides a vehicle-mounted wireless charger, which is used to overcome the above-mentioned defects in the prior art.

[0007] The purpose and effect of the in-vehicle wireless charger of the present invention are achieved by the following specific technical means: A vehicle-mounted wireless charger comprises a vehicle-mounted charging shell, a magnetic attraction ring arranged in the vehicle-mounted charging shell, and a charging module arranged in the middle of the magnetic attraction ring. The magnetic attraction ring comprises an annular back iron and a magnetic steel and an induction magnetic steel arranged on the back iron. The back iron has an annular groove. A plurality of magnetic steels are arranged in the annular groove. The plurality of magnetic steels are connected end to end to form an open-loop structure. The induction magnetic steel is arranged in the vacancy of the open-loop structure to form a complete magnetic ring. The inner ring portion of the magnetic steel is an inner arc magnet, the outer ring portion of the magnetic steel is an outer arc magnet, the middle portion of the magnetic steel is a non-magnetic area, the magnetization directions of the inner arc magnet and the outer arc magnet are both axial, and the magnetic pole directions of the inner arc magnet and the outer arc magnet are opposite.

[0008] According to a further technical solution, the magnet has four poles, the outer arc of the upper surface of the magnet is the S pole, the inner arc of the upper surface of the magnet is the N pole, the outer arc of the lower surface of the magnet is the N pole, and the inner arc of the lower surface of the magnet is the S pole.

[0009] According to a further technical solution, the radial width of the inner arc magnet is greater than the radial width of the outer arc magnet.

[0010] According to a further technical solution, the radial width of the outer arc magnet is H1, the radial width of the non-magnetic zone is H2, and the radial width of the inner arc magnet is H3, and the following relationship is satisfied: H1 = H2, and H1 + H2 = H3.

[0011] A further technical solution is that there is a first interface between the non-magnetic zone and the inner arc magnet, and a second interface between the non-magnetic zone and the outer arc magnet, the first interface and the second interface are parallel to each other, and the non-magnetic zone, the inner arc magnet and the outer arc magnet are integrally formed.

[0012] According to a further technical solution, the magnetic steel is an arc-shaped thin sheet, the magnetic steel is embedded in the annular groove, and the lower surface of the magnetic steel and the bottom surface of the annular groove are bonded together by gluing, so that the upper surface of the magnetic steel is not lower than the upper surface of the back iron.

[0013] A further technical solution is that the back iron has an outer edge and an inner edge, the outer edge and the inner 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, the spacing between the two open-loop thin sheets remains consistent, and a plurality of magnets are arranged end to end between the outer edge and the inner edge, and the inner wall of the open-loop thin sheet is close to the magnet to constrain the direction of the magnetic lines of force so that they gather in the middle of the back iron.

[0014] According to a further technical solution, the vehicle-mounted charging housing has a rectangular back plate, on which an annular adhesive is bonded, and the back iron is bonded to the annular adhesive.

[0015] According to a further technical solution, the surface of the back iron is also bonded with anti-fool back glue, which includes a glue ring and two connecting ears, and the two connecting ears extend radially outward from the center of the glue ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects: A vehicle-mounted wireless charger of the present application improves the structure of a magnetic attraction ring, which is formed by combining a number of magnets end to end. The magnet adopts a multi-pole design, specifically four poles, and the magnetic poles of the inner arc magnet and the outer arc magnet of each piece of magnet are in opposite directions, so that the distribution of magnetic lines of force is more uniform, which can effectively reduce the position deviation of the device during charging and improve the charging stability; the magnetization directions of the inner arc magnet and the outer arc magnet of the magnet are both axial, and the magnetic poles are in opposite directions, which can effectively constrain the direction of the magnetic lines of force and make them gather in the middle area of ​​the back iron, reduce electromagnetic interference, and thus improve the charging efficiency; the non-magnetic area design of the magnet and the optimization of the radial width ratio of the inner arc magnet and the outer arc magnet make the distribution of the magnetic lines of force more concentrated, reduce energy loss, and further improve the charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the structure of the magnetic attraction ring in the present invention; Figure 2 is a schematic structural diagram of the back iron 11 in the present invention; Figure 3 It is a schematic diagram of the structure of the magnetic attraction ring 10 in the present invention; Figure 4 It is a schematic diagram of the structure after the magnetic steel 12 and the induction magnetic steel 13 are combined in the present invention; Figure 5 A schematic diagram of the structure of the magnetic steel 12 in the present invention; Figure 6 A schematic diagram of a longitudinal cross-sectional view of the magnetic steel 12 in the present invention; Figure 7 Structural schematic diagrams of four embodiments of the first interface 18 and the second interface 19 in the magnetic steel 12 of the present invention; Figure 8 Structural schematic diagrams of two embodiments of the present invention in which the magnetic steel 12 is installed in the back iron 11; Fig. 9 A schematic diagram of the magnetization direction of the magnetic steel 12 in the present invention; Fig.10 A schematic diagram of a rectangular back plate 22 in the present invention; Fig.11 A schematic diagram of the structure of the rubber ring 24 and the connecting ear 25 in the present invention.

[0020] Description of reference numerals: 10. Magnetic ring; 11 back iron; 12 magnetic steel; 13 induction magnet; 14 annular groove; 15 inner arc magnet; 16 outer arc magnet; 17 non-magnetic area; 18 first interface; 19 second interface; 20 outer edge; 21 inner edge; 22 rectangular back panel; 23 ring adhesive; 24 rubber ring; 25 connecting ears; 26 Colloid. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] In the description of the present invention, unless otherwise specified, "plurality" means two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See attached Figure 1-Figure 11 The present invention provides a vehicle-mounted wireless charger, comprising a vehicle-mounted charging housing, a magnetic ring 10 disposed in the vehicle-mounted charging housing, and a charging module disposed in the middle of the magnetic ring 10, such as Figure 1-Figure 6As shown, the magnetic attraction ring 10 includes an annular back iron 11 and a magnetic steel 12 and an induction magnetic steel 13 arranged on the back iron 11. The back iron 11 has an annular groove 14. A plurality of magnetic steels 12 are arranged in the annular groove 14. The plurality of magnetic steels 12 are connected end to end to form an open loop structure. The induction magnetic steel 13 is arranged in the vacant position of the open loop structure to form a complete magnetic ring. The inner ring portion of the magnetic steel 12 is an inner arc magnet 15, the outer ring portion of the magnetic steel 12 is an outer arc magnet 16, the middle portion of the magnetic steel 12 is a non-magnetic area 17, the magnetization directions of the inner arc magnet 15 and the outer arc magnet 16 are both axial, and the magnetic pole directions of the inner arc magnet 15 and the outer arc magnet 16 are opposite.

[0025] Specifically, the magnetization direction of the magnetic steel 12 includes a first direction and a second direction. Fig. 9 The figure shows a cross-sectional view of the magnetic steel 12, wherein V1 indicates the first direction, and V2 indicates the second direction. Both the first direction and the second direction are perpendicular to the upper surface of the magnetic steel 12, and the first direction is opposite to the second direction. The first direction acts on the inner arc magnet 15 of the magnetic steel 12, and the second direction acts on the outer arc magnet 16 of the magnetic steel 12.

[0026] The magnetic steel 12 is made of sintered NdFeB material, grade N45SH, with a maximum operating temperature of 150 degrees Celsius. A large amount of heat will be generated during wireless charging. This material is selected as the magnetic steel 12 to have a high temperature resistance effect. The surface of the magnetic steel 12 is electroplated, and the plating material is NiCuNi. This plating layer consists of three layers, from the substrate to the outside, nickel layer, copper layer and nickel layer. The nickel-copper-nickel plating layer has good corrosion resistance and conductivity. In this embodiment, the plating thickness is ≥12μm.

[0027] Preferably, the magnetic steel 12 has four magnetic poles, the outer arc portion of the upper surface of the magnetic steel 12 is an S pole, and the inner arc portion is an N pole, and the outer arc portion of the lower surface of the magnetic steel 12 is an N pole, and the inner arc portion is an S pole.

[0028] In this embodiment, the magnetic steel 12 has magnetic poles in both the horizontal and vertical directions, which greatly enhances the magnetic attraction. Under the condition of equal magnetic attraction, the overall thickness of the magnetic steel can be reduced. In addition, the magnetic steel 12 has magnetic poles in the horizontal and vertical directions, which can reduce eddy currents. The magnetic attraction ring adopts a multi-pole design, that is, four magnetic poles, and the magnetic poles of the inner arc magnet 15 and the outer arc magnet 16 are in opposite directions, so that the magnetic lines of force are more evenly distributed, which can effectively reduce the position deviation of the device during charging and improve the charging stability.

[0029] Preferably, there is a first interface 18 between the non-magnetic region 17 and the inner arc magnet 15, and a second interface 19 between the non-magnetic region 17 and the outer arc magnet 16. The first interface 18 and the second interface 19 are parallel to each other, and the non-magnetic region 17, the inner arc magnet 15 and the outer arc magnet 16 are integrally formed. The non-magnetic region design of the magnetic steel and the optimization of the radial width ratio of the inner arc magnet and the outer arc magnet make the magnetic force line distribution more concentrated, reduce energy loss, and further improve the charging efficiency.

[0030] In this embodiment, if Figure 7 As shown in part (a), the first interface 18 and the second interface 19 are vertical planes, both of which are perpendicular to the upper surface of the magnetic steel 12.

[0031] In one embodiment of the present invention, Figure 7 As shown in part (b) of FIG. 1 , the first interface 18 and the second interface 19 are inclined surfaces, and the upper portions of the first interface 18 and the second interface 19 are both inclined toward the inner arc magnet 15 .

[0032] In one embodiment of the present invention, Figure 7 As shown in part (c) of FIG. 1 , the first interface 18 and the second interface 19 are inclined surfaces, and the upper portions of the first interface 18 and the second interface 19 are both inclined toward the outer arc magnet 16 .

[0033] In one embodiment of the present invention, Figure 7 As shown in part (d) of FIG. 1 , the first interface 18 and the second interface 19 are curved surfaces to increase the bonding surface between the non-magnetic region 17 and the inner arc magnets 15 and the outer arc magnets 16 on both sides.

[0034] Preferably, the radial width of the inner arc magnet 15 is greater than the radial width of the outer arc magnet 16. Figure 6 As shown, the radial width of the outer arc magnet 16 is H1, and the radial width of the inner arc magnet 15 is H3, H3>H1.

[0035] In this embodiment, the radial width H3 of the inner arc magnet 15 is 1.75 mm, and the radial width H1 of the outer arc magnet 16 is 0.9 mm.

[0036] Preferably, Figure 6 As shown, the radial width of the outer arc magnet 16 is H1, the radial width of the non-magnetic region 17 is H2, and the radial width of the inner arc magnet 15 is H3, and the following relationship is satisfied: H1 = H2, and H1 + H2 = H3.

[0037] In specific implementation, an error of ±0.05 mm is allowed between the value of H1 + H2 and the value of H3.

[0038] For example, in one embodiment of the present invention, H1 is 0.9 mm, H2 is 0.9 mm, and H3 is 1.75 mm. For example, in one embodiment of the present invention, H2 is 0.9 mm, H1 is 0.9 mm, and H3 is 1.80 mm.

[0039] For another example, in one embodiment of the present invention, H2 is 0.9 mm, H1 is 0.9 mm, and H3 is 1.85 mm.

[0040] In this embodiment, the induction magnetic steel 13 is in the shape of an arc-shaped sheet, and the width of the induction magnetic steel 13 is greater than the width of the magnetic steel 12. Specifically, the width of the induction magnetic steel 13 is 4.05 mm and the thickness is 0.7 mm, and the width of the magnetic steel 12 is 3.55 mm and the thickness is 0.35 mm. Figure 3 As shown, the width of the induction magnetic steel 13 is greater than the width of the magnetic steel 12. It should be noted that the width of the induction magnetic steel 13 and the magnetic steel 12 refers to the radial distance from the inner arc to the outer arc of the arc-shaped sheet.

[0041] Preferably, the magnetic steel 12 is an arc-shaped thin sheet, the magnetic steel 12 is embedded in the annular groove 14, and the lower surface of the magnetic steel 12 and the bottom surface of the annular groove 14 are bonded together by gluing so that the upper surface of the magnetic steel is not lower than the upper surface of the back iron 11.

[0042] In one embodiment of the present invention, Figure 8 As shown in part (c), the colloid 26 is applied to the bottom wall of the annular groove 14, and the thickness of the colloid 26 is 0.05 mm. The magnetic steel 12 is bonded to the bottom wall of the annular groove 14 through the colloid, and the upper surface of the magnetic steel 12 is flush with the upper surface of the back iron 11. In other embodiments, as Figure 8 As shown in part (d), the thickness of the colloid exceeds 0.05 mm, so that the upper surface of the magnetic steel 12 protrudes from the upper surface of the back iron 11.

[0043] In some embodiments of the present invention, Figure 8 Part (a) and Figure 8 As shown in part (b) of Figure 8 Part (c) and Figure 8 The difference from the embodiment shown in part (d) is that no colloid is applied to this embodiment, and the magnet 12 is embedded in the annular groove 14. The two side walls of the annular groove 14 clamp the two sides of the magnet 12. The combination of the magnet 12 and the back iron 11 relies on friction to achieve a fixing effect.

[0044] In one embodiment, if Figure 8 As shown in part (a), the thickness of the magnetic steel 12 is smaller than the thickness of the annular groove 14 , and the upper surface of the magnetic steel 12 is lower than the upper surfaces of the outer peripheral edge 20 and the inner peripheral edge 21 .

[0045] In other embodiments, Figure 8 As shown in part (b), the thickness of the magnetic steel 12 is equal to the thickness of the annular groove 14, and the upper surface of the magnetic steel 12 is flush with the upper surfaces of the outer peripheral edge 20 and the inner peripheral edge 21 respectively.

[0046] Preferably, Figure 8 As shown, the back iron 11 has an outer edge 20 and an inner edge 21, and the outer edge 20 and the inner edge 21 are two open-loop thin sheets arranged concentrically, and the two open-loop thin sheets are vertically connected to the bottom surface of the back iron 11, and the spacing between the two open-loop thin sheets remains consistent. A plurality of magnets 12 are arranged end to end between the outer edge 20 and the inner edge 21, and the inner wall of the open-loop thin sheet is tightly attached to the magnet 12 to constrain the direction of the magnetic lines of force so that they gather in the middle of the back iron 11.

[0047] Specifically, the back iron 11 is formed by stamping and bending a steel plate with a standard thickness of 0.5 mm, and the two side edges naturally form an outer edge 20 and an inner edge 21 .

[0048] The outer edge 20 and the inner edge 21 are used for electromagnetic shielding, and their materials can be selected from metal materials or alloys. For example, in this embodiment, the back iron 11 is made of electro-galvanized steel plate as a whole, and the cold-rolled steel plate is used as the raw material, which is hot-dip galvanized, has strong corrosion resistance, uniform coating thickness, and a smooth surface.

[0049] Preferably, Fig.10 As shown, the vehicle-mounted charging housing has a rectangular back plate 22 , an annular adhesive 23 is bonded to the rectangular back plate 22 , and the back iron 11 is bonded to the annular adhesive 23 .

[0050] Preferably, the surface of the back iron 11 is also bonded with fool-proof back glue, which includes a glue ring 24 and two connecting ears 25 , and the two connecting ears 25 both extend radially outward from the center of the glue ring 24 .

[0051] In this embodiment, the two connecting ears 25 have different shapes, one of which is rectangular, and the other is long and has an arc-shaped end. The extension direction of the two connecting ears 25 is consistent with the radial direction of the rubber ring 24. Fig.11 As shown, an angle is formed between the connecting line of the two connecting ears 25 and the two side edges of the rectangular back plate 22. In this embodiment, the angle is 10°.

[0052] The vehicle-mounted wireless charger of this embodiment is used to charge electronic products, and the electronic products may be mobile phones, tablet computers, smart watches, wearable devices, etc.

[0053] In other embodiments of the present application, the vehicle-mounted wireless charger further includes a base and a support frame movably connected to the base, the bottom of the base has a suction cup for adsorbing on a plane structure inside the vehicle, the support frame is fixedly connected to the vehicle-mounted charging shell, a power supply interface is provided on the vehicle-mounted charging shell, the power supply interface is connected to the charging interface of the car through a USB cable, and the charging module inside the vehicle-mounted charging shell is connected to the power supply interface through a cable. The base and the support frame are connected by a spherical pair, specifically, the base has a spherical groove, the support frame has a ball head, the ball head extends into the spherical groove and rolls freely therein to change the angle of the support frame and the vehicle-mounted charging shell.

[0054] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A vehicle-mounted wireless charger, comprising a vehicle-mounted charging housing, a magnetic attraction ring arranged in the vehicle-mounted charging housing, and a charging module arranged in the middle of the magnetic attraction ring, characterized in that: The magnetic attraction ring includes an annular back iron and a magnetic steel and an induction magnetic steel arranged on the back iron, the back iron has an annular groove, a plurality of the magnetic steels are arranged in the annular groove, a plurality of the magnetic steels are connected end to end to form an open-loop structure, the induction magnetic steel is arranged in the vacant position of the open-loop structure to combine to form a complete magnetic ring, the inner ring portion of the magnetic steel is an inner arc magnet, the outer ring portion of the magnetic steel is an outer arc magnet, the middle portion of the magnetic steel is a non-magnetic area, the magnetization directions of the inner arc magnet and the outer arc magnet are both axial, and the magnetic pole directions of the inner arc magnet and the outer arc magnet are opposite.

2. The vehicle-mounted 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 the S pole, the inner arc of the upper surface of the magnetic steel is the N pole, the outer arc of the lower surface of the magnetic steel is the N pole, and the inner arc of the lower surface of the magnetic steel is the S pole.

3. The vehicle-mounted wireless charger according to claim 1, characterized in that: The radial width of the inner arc magnet is greater than the radial width of the outer arc magnet.

4. The vehicle-mounted wireless charger according to claim 3, characterized in that: The radial width of the outer arc magnet is H1, the radial width of the non-magnetic zone is H2, and the radial width of the inner arc magnet is H3, and the following relationship is satisfied: H1 = H2, and H1 + H2 = H3.

5. The vehicle-mounted wireless charger according to claim 1, characterized in that: A first interface is provided between the non-magnetic region and the inner arc magnet, a second interface is provided between the non-magnetic region and the outer arc magnet, the first interface and the second interface are parallel to each other, and the non-magnetic region, the inner arc magnet and the outer arc magnet are integrally formed.

6. The vehicle-mounted wireless charger according to claim 1, characterized in that: The magnetic steel is an arc-shaped thin sheet, embedded in the annular groove, and the lower surface of the magnetic steel is bonded to the bottom surface of the annular groove by glue coating, so that the upper surface of the magnetic steel is not lower than the upper surface of the back iron.

7. The vehicle-mounted wireless charger according to claim 1, characterized in that: The back iron has an outer edge and an inner edge, the outer edge and the inner 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, the distance between the two open-loop thin sheets is consistent, and a plurality of magnets are arranged end to end between the outer edge and the inner edge, and the inner wall of the open-loop thin sheet is tightly attached to the magnet to constrain the direction of the magnetic lines of force so that they gather in the middle of the back iron.

8. The vehicle-mounted wireless charger according to claim 1, characterized in that: The vehicle-mounted charging housing has a rectangular back plate, an annular adhesive is bonded to the rectangular back plate, and the back iron is bonded to the annular adhesive.

9. The vehicle-mounted wireless charger according to claim 1, characterized in that: The surface of the back iron is also bonded with fool-proof back glue, and the fool-proof back glue includes a glue ring and two connecting ears, and the two connecting ears both extend radially outward from the center of the glue ring.

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