Wireless charging coil assembly

Abstract

A wireless charging coil assembly comprises a coil which is of a double-layer structure and is formed by winding two secondary stranded wires; the secondary stranded wire comprises a plurality of single stranded wires, and the plurality of single stranded wires are stranded together to form the secondary stranded wire; a coil is arranged on one end surface of the ferrite. The wireless charging coil assembly provided by the utility model is used for wireless charging of an intelligent watch, a secondary stranded wire of a multi-strand wire is wound into a coil with a double-layer structure, the thickness space can be fully utilized, and the ferrite made of a low-magnetic-loss ferrite material is matched, so that the skin effect during working can be avoided, the quality factor Q of the wireless charging assembly is increased, and the wireless charging efficiency is improved. Meanwhile, the coil adopts a concave surface structure in shape, and the ferrite assembling surface adopts a convex surface structure, so that the assembly is completely matched with the internal structure of the watch, the charging efficiency is higher, and the heating is lower.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, and specifically to a wireless charging coil assembly. Background Technology

[0002] Currently, more and more people are using smartwatches. Wearing a smartwatch on the wrist exposes it to various usage environments, such as rainy days, handwashing, and sweating in summer. These environments necessitate a sufficiently secure seal. To improve the seal of a smartwatch, wireless charging becomes essential. Using wireless charging completely eliminates the charging port, and the sealed design prevents moisture from entering the watch and affecting its functionality.

[0003] When a smartwatch is wirelessly charged, it must have a wireless charging receiver coil assembly. Because smartwatches are relatively small, a suitable wireless charging receiver assembly needs to be designed within a limited structural space. To maximize wireless charging efficiency, the magnetic loss of the magnetic material must be minimized while meeting inductance requirements.

[0004] Given a fixed inner and outer diameter for wireless charging, a certain number of turns are generally required to achieve the designed inductance value. To achieve this number of turns, the thickness of the smartwatch can be utilized by making the wireless charging component appropriately thicker. Generally, using a single strand of wire results in a relatively high AC resistance coil, leading to significant heat generation during operation, energy loss during wireless charging, and lower charging efficiency, thus failing to meet practical design requirements.

[0005] To solve the above-mentioned technical problems, this utility model adopts a method of winding two layers of coils with stranded wire. At the same time, in order to meet the structural requirements, a three-dimensional ferrite magnetic material is used to assemble the coil on the ferrite. Utility Model Content

[0006] Purpose of the utility model: To overcome the above shortcomings, the purpose of this utility model is to provide a wireless charging coil assembly for wireless charging of smartwatches. The assembly uses a double-layered coil structure formed by twisting multiple strands of wire, which fully utilizes the thickness space. Combined with low-magnetic-loss ferrite material, the skin effect during operation can be avoided, increasing the quality factor Q of the wireless charging assembly. Furthermore, the concave coil shape and convex ferrite assembly surface ensure that the assembly perfectly matches the internal structure of the watch, resulting in higher charging efficiency, lower heat generation, and broad application prospects.

[0007] Technical solution: A wireless charging coil assembly, comprising:

[0008] The coil has a double-layer structure and is wound with two secondary twisted wires; the secondary twisted wires include several single twisted wires, and several single twisted wires are twisted together to form a secondary twisted wire;

[0009] Ferrite, with a coil disposed on one end face of the ferrite.

[0010] The wireless charging coil assembly described in this utility model is used for wireless charging of smartwatches. By winding multi-strand wires into a double-layer coil structure, the thickness space can be fully utilized. Without increasing the overall volume, the number of turns of the coil is increased, which helps to improve the inductance, thereby enhancing the wireless charging effect and improving the charging efficiency.

[0011] Furthermore, the aforementioned wireless charging coil assembly also includes:

[0012] The coil has pins at both ends; the pins extend outward from the periphery of the coil toward the outside of the ferrite.

[0013] Furthermore, in the aforementioned wireless charging coil assembly, the secondary twisted wire comprises three individual twisted wires, which are twisted together to form the secondary twisted wire.

[0014] Furthermore, in the aforementioned wireless charging coil assembly, the single stranded wire comprises four copper enameled wires, which are twisted together to form a single stranded wire.

[0015] By twisting four copper enameled wires together to form a single strand, and then twisting several single strands together to form a secondary strand, this design effectively reduces the AC resistance compared to coils made with single-strand wire. The reduced AC resistance significantly improves the coil's heat generation during operation, reducing energy loss due to heat and thus increasing the efficiency of wireless charging, meeting practical design requirements.

[0016] Furthermore, in the aforementioned wireless charging coil assembly, the copper enameled wire is a copper enameled wire with a diameter of 0.08mm.

[0017] Furthermore, in the aforementioned wireless charging coil assembly, the coil has a concave structure.

[0018] The two wound coils are shaped into a concave structure to perfectly match the internal structure of the smartwatch. This compatibility allows for better integration of the wireless charging component into the watch, reducing gaps or looseness that may result from structural mismatches and improving the stability and reliability of the component. It also helps optimize the internal spatial layout of the watch, allowing for a more rational arrangement of other components.

[0019] Furthermore, in the aforementioned wireless charging coil assembly, the ferrite assembly surface has a convex structure.

[0020] The ferrite material used is a low-magnetic-loss ferrite material, which can reduce energy loss during wireless charging.

[0021] Designing the ferrite as a convex structure allows for a perfect match with the concave structure of the coil, further enhancing the overall integrity and stability of the wireless charging component. This tight matching structure helps reduce magnetic field leakage, improves magnetic field concentration, thereby enhancing magnetic flux, increasing the inductance of the wireless charging component, and improving charging efficiency.

[0022] Furthermore, the aforementioned wireless charging coil assembly has a boss at the center of the ferrite core for positioning the inner diameter of the coil; and a fixing groove on the outer periphery of the ferrite core for inserting pins.

[0023] A boss is designed at the center of the ferrite core to facilitate the positioning of the coil's inner diameter. This also increases the volume of the magnetic material, thereby enhancing the magnetic flux and increasing the inductance of the wireless charging component.

[0024] Furthermore, in the aforementioned wireless charging coil assembly, the coil is attached to one end face of the ferrite by adhesive.

[0025] The adhesive includes, but is not limited to, structural adhesives and UV adhesives.

[0026] The beneficial effects of this utility model are as follows: The wireless charging coil assembly described in this utility model is used for wireless charging of smartwatches. Its structure is reasonably designed. The double-layer coil is formed by winding multiple strands of wire into a double-layer structure, which can make full use of the thickness space. Combined with the low magnetic loss ferrite material, the skin effect during operation can be avoided, which increases the quality factor Q of the wireless charging assembly. At the same time, the coil shape uses a concave structure and the ferrite assembly surface uses a convex structure, so that the wireless charging coil assembly is perfectly matched with the internal structure of the smartwatch, resulting in higher charging efficiency, lower heat generation, and broad application prospects. Attached Figure Description

[0027] Figure 1 This is a top view of the wireless charging coil assembly described in this utility model;

[0028] Figure 2 This is a cross-sectional view of the wireless charging coil assembly described in this utility model;

[0029] Figure 3 This is an exploded view of the wireless charging coil assembly described in this utility model;

[0030] Figure 4 This is a schematic diagram of the coil structure of the wireless charging coil assembly described in this utility model;

[0031] Figure 5 This is a cross-sectional view of the secondary twisted wire of the wireless charging coil assembly described in this utility model;

[0032] Figure 6 This is a cross-sectional view of a single stranded wire in the wireless charging coil assembly described in this utility model.

[0033] In the diagram: Coil 1, Secondary stranded wire 11, Single stranded wire 111, Copper enameled wire 1111, Ferrite 2, Boss 21, Fixing groove 22, Pin 3, Glue 4. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1 , 2 Examples 1, 2, 3, 4, 5, 6 and Examples 1 and 2 further illustrate this utility model.

[0035] Example 1

[0036] like Figure 1 , 2 As shown in Figures 1 and 3, the wireless charging coil assembly of this utility model includes a coil 1, a ferrite 2, a pin 3, and an adhesive 4.

[0037] Furthermore, such as Figure 1 As shown, a coil 1 is provided on one end face of the ferrite 2, and pins 3 are connected to both ends of the coil 1; the pins 3 extend outward from the periphery of the coil 1 towards the outside of the ferrite 2.

[0038] Furthermore, such as Figure 2 As shown, the coil 1 has a double-layer structure, consisting of two secondary twisted wires 11 wound together. Each secondary twisted wire 11 is formed by twisting several single twisted wires 111 together. The coil 1 has a convex structure.

[0039] Furthermore, such as Figure 2 As shown, the ferrite 2 has a three-dimensional structure. A boss 21 is provided at the center of the ferrite 2 for positioning the inner diameter of the coil 1, while also increasing the volume of the magnetic material, thereby enhancing the magnetic flux and increasing the inductance of the wireless charging component. A fixing groove 22 is provided on the outer periphery of the ferrite 2 for inserting the pin 3. The ferrite assembly surface has a convex structure, which can perfectly match the concave structure of the coil 1, further enhancing the integrity and stability of the wireless charging component. This tight matching structure helps to reduce magnetic field leakage, improve the concentration of the magnetic field, thereby enhancing the magnetic flux, increasing the inductance of the wireless charging component, and improving charging efficiency.

[0040] Furthermore, such as Figure 3 As shown, the coil 1 is attached to one end face of the ferrite 2 by glue 4.

[0041] Example 2

[0042] Based on the structural foundation of Embodiment 1 and above, such as Figure 1 , 2 As shown in 3, 4, 5, and 6.

[0043] like Figure 5 As shown, in the wireless charging coil assembly of this utility model, the secondary twisted wire 11 includes three single twisted wires 111, which are twisted together to form the secondary twisted wire 11.

[0044] Furthermore, such as Figure 6 As shown, the single twisted wire 111 comprises four copper enameled wires 1111, which are twisted together to form a single twisted wire 111. Twisting the four copper enameled wires together to form a single twisted wire 111, and then twisting three of these single twisted wires together to form a secondary twisted wire 11, effectively reduces the AC resistance compared to coils made with single-strand wires. This reduction in AC resistance significantly improves the heat generation of the coil 1 during operation, reducing energy loss due to heat generation and thus improving the efficiency of wireless charging, meeting the actual design requirements.

[0045] Furthermore, the copper enameled wire 1111 is a copper enameled wire with a diameter of 0.08 mm.

[0046] The assembly method of the wireless charging coil assembly is as follows:

[0047] 1. For example Figure 5 , 6 As shown, four 0.08mm copper enameled wires 1111 are twisted together to form a single twisted wire 111. Then, three sets of single twisted wires 111 are twisted together to form the final required secondary twisted wire 11, thereby improving the quality factor Q of the final product (quality factor Q is an important indicator for measuring the performance of a wireless charging system. The higher the Q value, the lower the energy loss and the higher the efficiency of the system).

[0048] 2. For example Figure 4 As shown, the pre-made secondary twisted wire 11 is wound into a double-layer coil to make full use of the thickness space;

[0049] 3. For example Figure 2 As shown, the coil 1 with the two-layer structure is shaped into a concave structure, which can then perfectly match the internal structure of the smartwatch.

[0050] 4. For example Figure 1 , 2As shown in Figure 3, the ferrite 2 is designed as a convex structure to match the concave structure of the coil 1. At the same time, a boss 21 is designed in the center of the ferrite 2 to facilitate the positioning of the inner diameter of the coil 1, while increasing the volume of the magnetic material, thereby enhancing the magnetic flux and increasing the inductance of the wireless charging component.

[0051] 5. Attach coil 1 to one end face of ferrite 2 with glue 4 to assemble a wireless charging coil assembly.

[0052] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A wireless charging coil assembly, characterized in that, include: The coil (1) has a double-layer structure and is wound by two secondary twisted wires (11); the secondary twisted wire (11) includes several single twisted wires (111), and several single twisted wires (111) are twisted together to form a secondary twisted wire (11). Ferrite (2), with a coil (1) provided on one end face of the ferrite (2).

2. The wireless charging coil assembly according to claim 1, characterized in that, Also includes: Pin (3), the two ends of the coil (1) are connected to pin (3); the pin (3) extends outward from the periphery of the coil (1) toward the ferrite (2).

3. The wireless charging coil assembly according to claim 1, characterized in that, The secondary twisted wire (11) includes three single twisted wires (111), which are twisted together to form the secondary twisted wire (11).

4. The wireless charging coil assembly according to claim 1 or 3, characterized in that, The single stranded wire (111) includes four copper enameled wires (1111), which are twisted together to form a single stranded wire (111).

5. The wireless charging coil assembly according to claim 4, characterized in that, The copper enameled wire (1111) is a copper enameled wire with a diameter of 0.08 mm.

6. The wireless charging coil assembly according to claim 1, characterized in that, The coil (1) has a concave structure.

7. The wireless charging coil assembly according to claim 2, characterized in that, The ferrite (2) assembly surface has a convex structure.

8. The wireless charging coil assembly according to claim 7, characterized in that, A boss (21) is provided at the center of the ferrite (2) for positioning the inner diameter of the coil (1); a fixing groove (22) is provided on the outer periphery of the ferrite (2) for inserting the pin (3).

9. The wireless charging coil assembly according to claim 1, characterized in that, The coil (1) is attached to one end face of the ferrite (2) by glue (4).

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