Wireless charger

Abstract

The utility model relates to a wireless charger, which comprises a first shell and a second shell, the wireless charger is ingenious in structural arrangement, the heat dissipation aluminum sheet and the coil are separated through the first magnetic isolation sheet, and the first magnetic isolation sheet and the heat dissipation aluminum sheet are arranged at intervals, so that the eddy current loss on the heat dissipation aluminum sheet can be greatly reduced, the charging efficiency is improved, a certain heat dissipation space can be provided for the power module, the influence on the coil is reduced, and the service life of the wireless charger is prolonged. And the service life of the wireless charger is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of chargers, and more specifically, to a wireless charger. Background Art

[0002] A wireless charger is a charger that does not require a traditional charging power cord to connect to the terminal device that needs to be charged. It uses the latest wireless charging technology. This technology uses the magnetic field generated between coils to transmit power, and uses inductive coupling technology as a bridge to connect the charging base station and the device. Wireless charging technology has been widely used in daily life;

[0003] A wireless charger has appeared on the market, such as patent number CN201721530007.X discloses a wireless charger structure, such as Figure 1 As shown, the charger body 1 includes an upper shell 111 and a lower shell 112, and a coil 14, a heat dissipation aluminum plate 12, a PCB board 15, and a second heat-conducting member 16 are sequentially arranged between the upper shell 111 and the lower shell 112; a plurality of first heat-conducting members 13 are circumferentially arranged on the outer periphery of the heat dissipation aluminum plate 12; the coil 14 is fixedly installed on the upper surface of the heat dissipation aluminum plate 12, and the heat of the charging coil can be prevented from being transferred to the PCB board through the heat dissipation aluminum plate by arranging the PCB board 15 and the heat dissipation aluminum plate 12 at intervals. However, since the heat dissipation aluminum plate 12 has good conductivity, after power is turned on, the current generates an alternating magnetic field in the coil 14. According to Faraday's law of electromagnetic induction, an induced electromotive force is generated in the conductor, and then an induced current, namely, eddy current, is generated. The direct connection between the heat dissipation aluminum plate 12 and the coil 14 will undoubtedly increase the eddy current loss of the wireless charger. The eddy current will generate heat inside the conductor, thereby causing the wireless charger to heat up seriously and lose a lot of energy. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a wireless charger in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a wireless charger, comprising a first shell and a second shell detachably connected to the first shell, characterized in that the first shell and the second shell are mutually enclosed to form an installation cavity; a power module and a coil are arranged between the first shell and the second shell; a heat dissipation aluminum plate is fixedly arranged on a side surface of the power module facing the coil; a first magnetic isolation sheet is arranged in the installation cavity between the heat dissipation aluminum plate and the coil; the heat dissipation aluminum plate and the first magnetic isolation sheet are arranged at intervals;

[0006] The wireless charger of the utility model, wherein a second magnetic isolation sheet parallel to the first magnetic isolation sheet is provided between the first magnetic isolation sheet and the coil;

[0007] The wireless charger of the utility model, wherein the first magnetic isolation sheet and the second magnetic isolation sheet are spaced apart, and the second magnetic isolation sheet and the coil are spaced apart or attached to each other;

[0008] In the wireless charger of the utility model, the distance between the first magnetic isolation sheet and the second magnetic isolation sheet is greater than the distance between the first magnetic isolation sheet and the heat dissipation aluminum plate;

[0009] In the wireless charger of the utility model, the distance between the first magnetic isolation sheet and the second magnetic isolation sheet is 5-8 mm, and the distance between the first magnetic isolation sheet and the heat dissipation aluminum plate is 2-4 mm;

[0010] The wireless charger described in the utility model, wherein the power module includes a mounting chamber fixedly connected to the heat dissipation aluminum plate; a heat dissipation fin is provided on a surface of the mounting chamber facing away from the heat dissipation aluminum plate; a PCB board is fixedly installed in the mounting chamber;

[0011] The wireless charger of the utility model, wherein the first shell is provided with an opening adapted to the heat dissipation fin and for the heat dissipation fin to pass through; the opening is communicated with the installation cavity;

[0012] The wireless charger described in the utility model, wherein the second shell includes a substrate and a side wall extending from the outer edge of the substrate toward the first shell; the substrate and the side wall are mutually enclosed to form a groove; the substrate is located in the groove and is provided with a first support portion supporting the first magnetic isolation sheet and a second support portion supporting the second magnetic isolation sheet in sequence from the outside to the inside; the upper surface of the first support portion is higher than the upper surface of the second support portion;

[0013] The wireless charger described in the utility model, wherein the first support portion and the second support portion are both arranged in an annular shape; the first support portion and the second support portion are arranged coaxially; and a receiving cavity for placing the coil is provided on the substrate between the first support portion and the second support portion;

[0014] The wireless charger described in the utility model, wherein a wireless charging position corresponding to the coil is provided on a side surface of the substrate facing away from the first shell; and a plurality of positioning grooves are provided on the second shell around the wireless charging position.

[0015] The beneficial effect of the utility model is that the structure of the wireless charger is cleverly arranged, the heat dissipation aluminum sheet and the coil are separated by the first magnetic isolation sheet, and the first magnetic isolation sheet and the heat dissipation aluminum sheet are arranged at intervals, which can not only greatly reduce the eddy current loss on the heat dissipation aluminum sheet and improve the charging efficiency, but also provide a certain heat dissipation space for the power module, reduce the impact on the coil, and extend the service life of the wireless charger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0017] Figure 1 is a three-dimensional exploded view of a wireless charger structure in the background art;

[0018] Figure 2 A schematic diagram of a wireless charger according to a preferred embodiment of the utility model Figure 1 ;

[0019] Figure 3 yes Figure 1 Left view of the wireless charger;

[0020] Figure 4 yes Figure 3 Sectional view of AA in the middle;

[0021] Figure 5 yes Figure 2 Exploded view of the wireless charger;

[0022] Figure 6 This is a schematic diagram of the structure of a wireless charger in a preferred embodiment of the utility model. Figure 2 . DETAILED DESCRIPTION

[0023] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] "Multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0026] Moreover, the terms "up, down, front, back, left, right, upper end, lower end, longitudinal" and the like indicating directions are all based on the posture and position of the device or equipment described in this solution during normal use.

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0028] A wireless charger in a preferred embodiment of the utility model can be applied to the field of wireless charging of electric vehicles, such as Figure 2-5 As shown, it includes a first shell 21 and a second shell 22 detachably connected to the first shell 21, and the first shell 21 and the second shell 22 can be connected by fastening bolts, or by a snap-on structure or ultrasonic connection in the prior art; wherein, the first shell 21 and the second shell 22 are mutually enclosed to form an installation cavity 23; a power module 24 and a coil 25 are arranged between the first shell 21 and the second shell 22; a heat dissipation aluminum plate 241 is fixedly arranged on the side surface of the power module 24 facing the coil 25; the heat dissipation aluminum plate 241 can not only assist the power module 24 in heat dissipation, but also provide support for the power module 24; the power module 24 is fixedly installed in the installation cavity 23 through the heat dissipation aluminum plate 241, and the structure is stable; a first magnetic isolation plate 26 is arranged in the installation cavity 23 between the heat dissipation aluminum plate 241 and the coil 25; the heat dissipation aluminum plate 241 and the first magnetic isolation plate 26 are arranged at intervals; the magnetic isolation plate is made of ferrite material or nanocrystalline material.

[0029] The structure of the wireless charger is cleverly set up. The heat sink aluminum sheet and the coil are separated by the first magnetic isolation sheet, and the first magnetic isolation sheet and the heat sink aluminum sheet are set at a distance. This can not only greatly reduce the eddy current loss on the heat sink aluminum sheet and improve the charging efficiency, but also provide a certain heat dissipation space for the power module, reduce the impact on the coil, and extend the service life of the wireless charger.

[0030] In another embodiment, in order to significantly reduce the leakage of the magnetic field, a second magnetic isolation sheet 27 parallel to the first magnetic isolation sheet 26 is further provided between the first magnetic isolation sheet 26 and the coil 25. In the utility model, the first and second magnetic isolation sheets are both magnetic sheet auxiliary materials for the coils at both ends of the wireless charger, and are soft magnetic materials sintered at a constant high temperature, with high magnetic permeability and low magnetic loss factor.

[0031] Furthermore, the first magnetic isolation sheet 26 and the second magnetic isolation sheet 27 are spaced apart, and the second magnetic isolation sheet 27 and the coil 25 are spaced apart or fitted together; compared with the prior art method of reducing eddy current loss by using a thicker heat sink block, the utility model uses two layers of magnetic isolation sheets (the first magnetic isolation sheet 26 and the second magnetic isolation sheet 27) to be spaced apart and placed, which can significantly reduce the distance between the heat sink aluminum plate and the coil by more than 50% under the condition of the same eddy current loss in the prior art, and can reduce the overall thickness of the receiving end for easy carrying.

[0032] Furthermore, the distance between the first magnetic shielding sheet 26 and the second magnetic shielding sheet 27 is greater than the distance between the first magnetic shielding sheet 26 and the heat dissipation aluminum plate 241. In one embodiment, the distance between the first magnetic shielding sheet 26 and the second magnetic shielding sheet 27 is 5-8mm, preferably 5mm; the distance between the first magnetic shielding sheet 26 and the heat dissipation aluminum plate 241 is 2-4mm, preferably 3mm. The distance between the first and second magnetic shielding sheets, and the distance between the second magnetic shielding sheet and the heat dissipation aluminum plate are the optimal distances to ensure that the spacing distance is as small as possible and the eddy current loss is as small as possible, so that the overall thickness of the wireless charger is thinner.

[0033] Furthermore, the power module 24 includes a mounting chamber 242 fixedly connected to the heat dissipation aluminum plate 241; the mounting chamber 242 is a long box structure, and a heat dissipation fin 243 is provided on the surface of the mounting chamber 242 facing away from the heat dissipation aluminum plate 241; a PCB board 244 is fixedly installed in the mounting chamber 242, and optionally, a battery 245 electrically connected to the PCB board 244 is also provided in the mounting chamber 242. By arranging the PCB board 244 in the mounting chamber 242, the influence of the magnetic field on the components on the circuit board can be shielded, thereby ensuring the normal operation of the circuit and a long service life.

[0034] In order to facilitate faster heat dissipation of the power module 24, Figure 2As shown, the first housing 21 is provided with an opening 211 adapted to and passed through the heat dissipation fin 243; the opening 211 is connected to the installation cavity 23, so that the power module 24 can quickly dissipate heat to the air through the heat dissipation fin 243; the area of ​​the heat dissipation aluminum plate 241 is larger than the area of ​​the opening 211, so as to prevent the power module 24 from being separated from the installation cavity 23 from the opening 211;

[0035] Furthermore, the second shell 22 includes a substrate 221 and a side wall 222 extending from the outer edge of the substrate 221 toward the first shell 21; the substrate 221 and the side wall 222 are mutually surrounded to form a groove 223; the substrate 221 is located in the groove 223 and is provided with a first support portion 224 supporting the first magnetic isolation plate 26 and a second support portion 225 supporting the second magnetic isolation plate 27 from the outside to the inside; the upper surface of the first support portion 224 is higher than the upper surface of the second support portion 225, and the structure is stable.

[0036] Furthermore, the first support portion 224 and the second support portion 225 are both arranged in an annular shape; the first support portion 224 and the second support portion 225 are arranged coaxially; a receiving cavity 226 for placing the coil 25 is provided on the substrate 221 between the first support portion 224 and the second support portion 225, and the structure is compact.

[0037] like Figure 6 As shown, a wireless charging position 227 corresponding to the coil 25 is provided on the side surface of the substrate 221 facing away from the first shell 21; a plurality of positioning grooves 228 are provided around the wireless charging position 227 on the second shell 22 to facilitate positioning and connection with an external wireless transmitting terminal to ensure normal charging.

[0038] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A wireless charger, comprising a first shell and a second shell detachably connected to the first shell, characterized in that: The first shell and the second shell are mutually enclosed to form an installation cavity; a power module and a coil are arranged between the first shell and the second shell; a heat dissipation aluminum plate is fixedly arranged on a surface of the power module facing the coil; a first magnetic isolation plate is arranged in the installation cavity between the heat dissipation aluminum plate and the coil; the heat dissipation aluminum plate and the first magnetic isolation plate are spaced apart.

2. The wireless charger according to claim 1, characterized in that: A second magnetic isolation sheet parallel to the first magnetic isolation sheet is also provided between the first magnetic isolation sheet and the coil.

3. The wireless charger according to claim 2, characterized in that: The first magnetic isolation sheet and the second magnetic isolation sheet are spaced apart from each other, and the second magnetic isolation sheet and the coil are spaced apart from each other or are closely attached to each other.

4. The wireless charger according to claim 3, characterized in that: The distance between the first magnetic isolation sheet and the second magnetic isolation sheet is greater than the distance between the first magnetic isolation sheet and the heat dissipation aluminum plate.

5. The wireless charger according to claim 4, characterized in that: The distance between the first magnetic isolation sheet and the second magnetic isolation sheet is 5-8 mm, and the distance between the first magnetic isolation sheet and the heat dissipation aluminum plate is 2-4 mm.

6. The wireless charger according to any one of claims 1 to 5, characterized in that: The power module comprises an installation chamber fixedly connected to the heat dissipation aluminum plate; a surface of the installation chamber on a side facing away from the heat dissipation aluminum plate is provided with heat dissipation fins; and a PCB board is fixedly installed in the installation chamber.

7. The wireless charger according to claim 6, characterized in that: The first shell is provided with an opening adapted to the heat dissipation fin and for the heat dissipation fin to pass through; the opening is communicated with the installation cavity.

8. The wireless charger according to any one of claims 2 to 5, characterized in that: The second shell includes a base plate and a side wall extending from the outer edge of the base plate toward the first shell; the base plate and the side wall are mutually surrounded to form a groove; the base plate is located in the groove and is provided with a first support portion supporting the first magnetic isolation plate and a second support portion supporting the second magnetic isolation plate in sequence from the outside to the inside; the upper surface of the first support portion is higher than the upper surface of the second support portion.

9. The wireless charger according to claim 8, characterized in that: The first supporting part and the second supporting part are both arranged in an annular shape, and the first supporting part and the second supporting part are arranged coaxially; a receiving cavity for placing the coil is provided on the substrate between the first supporting part and the second supporting part.

10. The wireless charger according to claim 9, characterized in that: A wireless charging position corresponding to the coil is provided on a surface of the substrate on one side facing away from the first shell; and a plurality of positioning grooves are provided on the second shell around the wireless charging position.

Images