A split-type wireless charging coil assembly

Abstract

The present invention discloses a split-type wireless charging coil assembly, comprising: a first coil assembly and a second coil assembly connected to the first coil assembly. The first coil assembly is stacked directly above the second coil assembly, and the first coil assembly and the second coil assembly form a complete circle. The first coil assembly includes a first wire and a first coil and a second coil respectively wound at both ends of the first wire. Both the first coil and the second coil are arc-shaped, and there is a first spacing between the first coil and the second coil. The second coil assembly includes a second wire and a third coil and a fourth coil respectively wound at both ends of the second wire. Both the third coil and the fourth coil are arc-shaped, and there is a second spacing between the third coil and the fourth coil. According to the present invention, it is applicable to smart home devices such as mobile phones, mobile table lamps, and speakers, and the coil is beneficial to increasing the charging area of the wireless charging solution.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and particularly to a split-type wireless charging coil assembly. Background Art

[0002] With the wide application of wireless charging technology, products have an increasingly high requirement for the charging area and make the most of the space as much as possible. At present, the wireless charging market requires a uniform magnetic field distribution of the coil to increase the effective charging area. Based on this goal, a coil that can effectively improve the magnetic field distribution is invented. With the rapid development of the wireless charging mobile device market, there are more and more demands for charging convenience. The popularization and application of wireless charging technology have been generally accepted by ordinary users, and the application of the wireless charging receiver is more conducive to its charging convenience.

[0003] Most of the existing wireless charging receiver solutions are wound coils with a uniform wire diameter, and the magnetic field distribution is uneven, thus affecting the charging efficiency. Summary of the Invention

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the present invention is to provide a split-type wireless charging coil assembly, which is applicable to smart home devices such as mobile phones, mobile table lamps, and speakers, and the coil is beneficial to increasing the charging area of the wireless charging solution. To achieve the above object and other advantages according to the present invention, there is provided a split-type wireless charging coil assembly, including:

[0005] A first coil assembly and a second coil assembly connected to the first coil assembly, the first coil assembly is stacked directly above the second coil assembly, and the first coil assembly and the second coil assembly form a complete circle;

[0006] The first coil assembly includes a first wire and a first coil and a second coil respectively wound at both ends of the first wire. Both the first coil and the second coil are arc-shaped, and there is a first distance between the first coil and the second coil;

[0007] The second coil assembly includes a second wire and a third coil and a fourth coil respectively wound at both ends of the second wire. Both the third coil and the fourth coil are arc-shaped, and there is a second distance between the third coil and the fourth coil.

[0008] Preferably, the distance between each turn of the first coil and the second coil is the first coil distance, and the first coil distance gradually increases from the inner circle to the outer circle of the first coil and the second coil.

[0009] Preferably, the distance between each turn of the third coil and the fourth coil is the second coil distance, and the second coil distance gradually increases from the inner circle to the outer circle of the third coil and the fourth coil.

[0010] Preferably, the wire widths of the first coil and the second coil are both the first wire width, and the first wire width gradually increases or decreases from the inner circle to the outer circle of the first coil and the second coil.

[0011] Preferably, the wire widths of the third coil and the fourth coil are both the second wire width, and the second wire width gradually increases or decreases from the inner circle to the outer circle of the third coil and the fourth coil.

[0012] Preferably, a first fixing member and a second fixing member are respectively fixed on each turn of the first coil and the second coil. Through holes are formed in both the first fixing member and the second fixing member, and first flat rods are respectively fixed on the first fixing member and the second fixing member.

[0013] Preferably, the wire heads at both ends of a first wire respectively penetrate through the through holes in the first fixing member and the second fixing member, and the wire heads at both ends of the first wire are respectively connected to both ends of a second wire.

[0014] Preferably, a third fixing member and a fourth fixing member are respectively fixed on each turn of the third coil and the fourth coil, and second flat rods are respectively fixed on the third fixing member and the fourth fixing member.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The wire widths and wire spacings between the first coil and the second coil and between the third coil and the fourth coil can be cross-matched with different widths, or the wire widths and wire spacings of each turn can be equal from the inside to the outside, so that the design of the coil can be diversified; moreover, according to the magnetic field distribution, the wire widths and wire spacings of the first coil and the second coil and of the third coil and the fourth coil can be adjusted, so that the magnetic field can be adjusted and the effective charging area can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The top view of the first coil assembly of the split wireless charging coil assembly according to the present invention;

[0017] Figure 2 The three-dimensional structure diagram of the second coil assembly of the split wireless charging coil assembly according to the present invention.

[0018] In the figure: 1. First coil assembly; 2. Second coil assembly; 3. First fixing member; 4. Second fixing member; 5. First flat rod; 6. Third fixing member; 7. Fourth fixing member; 8. Second flat rod; 11. First wire; 12. First coil; 13. Second coil; 14. First spacing; 21. Second wire; 22. Third coil; 23. Fourth coil; 24. Second spacing. DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Referring to Figure 1-2 , a split wireless charging coil assembly includes: a first coil assembly 1 and a second coil assembly 2 connected directly above the first coil assembly 1, and the first coil assembly 1 and the second coil assembly 2 form a complete circle;

[0021] The first coil assembly 1 includes a first wire 11 and a first coil 12 and a second coil 13 respectively wound at both ends of the first wire 11. Both the first coil 12 and the second coil 13 are arc-shaped, and there is a first spacing 14 between the first coil 12 and the second coil 13. The second coil assembly 2 includes a second wire 21 and a third coil 22 and a fourth coil 23 respectively wound at both ends of the second wire 21. Both the third coil 22 and the fourth coil 23 are arc-shaped, and there is a second spacing 24 between the third coil 22 and the fourth coil 23. The sizes of the first spacing 14 and the second spacing 24 can be adjusted as needed.

[0022] Further, the spacing between each turn of the first coil 12 and the second coil 13 is the first coil spacing, and the first coil spacing gradually increases from the inner circle to the outer circle of the first coil 12 and the second coil 13.

[0023] Further, the spacing between each turn of the third coil 22 and the fourth coil 23 is the second coil spacing, and the second coil spacing gradually increases from the inner circle to the outer circle of the third coil 22 and the fourth coil 23.

[0024] Further, the wire widths of the first coil 12 and the second coil 13 are both the first wire width, and the first wire width gradually increases or decreases from the inner circle to the outer circle of the first coil 12 and the second coil 13.

[0025] Further, the wire widths of the third coil 22 and the fourth coil 23 are both the second wire width, and the second wire width gradually increases or decreases from the inner circle to the outer circle of the third coil 22 and the fourth coil 23.

[0026] Further, first fixing members 3 and second fixing members 4 are respectively fixed on each turn of the first coil 12 and the second coil 13. Through holes are formed in both the first fixing members 3 and the second fixing members 4, and first flat rods 5 are respectively fixed on the first fixing members 3 and the second fixing members 4. The first flat rods 5 keep the first coil 12 and the second coil 13 flat, without unevenness. The wire ends at both ends of the first wire 11 respectively penetrate through the through holes in the first fixing members 3 and the second fixing members 4, and the wire ends at both ends of the first wire 11 are respectively connected to both ends of the second wire 21.

[0027] Further, third fixing members 6 and fourth fixing members 7 are respectively fixed on each turn of the third coil 22 and the fourth coil 23, and second flat rods 8 are respectively fixed on the third fixing members 6 and the fourth fixing members 7. The second flat rods 8 ensure the flatness of the planes of the third coil 22 and the fourth coil 23, without unevenness.

[0028] In one embodiment, the wire widths of the first wire 11 and the second wire 21 increase gradually from the inside to the outside. It is set that the wire width of the first turn is d, and the gradual change amount is s. It is also possible that each turn has an equal wire width from the inside to the outside, and the wire width of each turn can be expressed as d', with the unit of mm, then d' = d + (N - 1) * S.

[0029] The magnetic field intensity is proportional to the loss. At the position where the magnetic field is the strongest, the skin effect is obvious, and the winding loss is also the largest. The magnetic field intensity in the middle of the wireless charging coil is the strongest, so the skin effect of the middle winding is the largest.

[0030] The skin depth in the skin effect is shown by the following formula.

[0031]

[0032] △—Skin depth;

[0033] ω—Angular frequency, ω = 2πf, where f is the magnetic field frequency;

[0034] μ—Magnetic permeability;

[0035] γ—Conductivity;

[0036] Because the magnetic field in the middle is the strongest, the skin depth of the middle winding is the smallest, so the wire width of the middle winding does not need to be too wide, and the wire width of the middle winding is the smallest.

[0037] The magnetic field intensity weakens gradually from the inside to the outside, and the corresponding winding wire widths also become wider from the inside to the outside. In this way, the overall loss of the coil is reduced, the charging efficiency is improved, and the coil temperature rise is reduced.

[0038] The number of devices and the processing scale described herein are used to simplify the description of the present invention, and applications, modifications, and variations of the present invention will be apparent to those skilled in the art.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. A split-type wireless charging coil assembly, characterized in that, Comprising: A first coil assembly (1) and a second coil assembly (2) connected to the first coil assembly (1), the first coil assembly (1) being stacked directly above the second coil assembly (2), and the first coil assembly (1) and the second coil assembly (2) forming a complete circle; The first coil assembly (1) includes a first wire (11) and a first coil (12) and a second coil (13) respectively wound at both ends of the first wire (11), both the first coil (12) and the second coil (13) being arc-shaped, and a first spacing (14) being provided between the first coil (12) and the second coil (13); The second coil assembly (2) includes a second wire (21) and a third coil (22) and a fourth coil (23) respectively wound at both ends of the second wire (21), both the third coil (22) and the fourth coil (23) being arc-shaped, and a second spacing (24) being provided between the third coil (22) and the fourth coil (23); The spacing between each turn of the first coil (12) and the second coil (13) is the first coil spacing, and the first coil spacing gradually increases from the inner circle to the outer circle of the first coil (12) and the second coil (13); The spacing between each turn of the third coil (22) and the fourth coil (23) is the second coil spacing, and the second coil spacing gradually increases from the inner circle to the outer circle of the third coil (22) and the fourth coil (23); The wire widths of the first coil (12) and the second coil (13) are both the first wire width, and the first wire width gradually increases or decreases from the inner circle to the outer circle of the first coil (12) and the second coil (13); The wire widths of the third coil (22) and the fourth coil (23) are both the second wire width, and the second wire width gradually increases or decreases from the inner circle to the outer circle of the third coil (22) and the fourth coil (23).

2. The split-type wireless charging coil assembly according to claim 1, wherein A first fixing member (3) and a second fixing member (4) are respectively fixed on each turn of the first coil (12) and the second coil (13), perforations are provided on both the first fixing member (3) and the second fixing member (4), and a first flat rod (5) is fixedly connected to both the first fixing member (3) and the second fixing member (4).

3. The split-type wireless charging coil assembly according to claim 2, wherein, The wire heads at both ends of the first wire (11) respectively penetrate through the perforations on the first fixing member (3) and the second fixing member (4), and the wire heads at both ends of the first wire (11) are respectively connected to both ends of the second wire (21).

4. A split-type wireless charging coil assembly according to claim 1, characterized in that, A third fixing member (6) and a fourth fixing member (7) are respectively fixed on each turn of the third coil (22) and the fourth coil (23), and a second flat rod (8) is fixedly connected to both the third fixing member (6) and the fourth fixing member (7).

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