Wireless charging coil and charging device

Abstract

The utility model relates to the technical field of wireless charging coils, and discloses a wireless charging coil which comprises a magnetic conductive assembly and a wire, and the magnetic conductive assembly comprises a magnetic conductive sheet; one section of the wire is wound along a first direction to form a vortex-shaped first coil, the other section of the wire is wound along a second direction to form a vortex-shaped second coil, the first direction is opposite to the second direction, the first coil and the second coil are opposite in rotation direction and are sequentially arranged on the magnetic conductive sheet, and the first coil is connected with the magnetic conductive sheet. According to the utility model, the formed double-layer coils are connected without welding, so that the processing difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging coils, and in particular to a wireless charging coil and a charging device. Background Art

[0002] Wireless charging coils are typically made of wound wires and can be flat, spiral, cylindrical, or other shapes. They utilize Faraday's law of electromagnetic induction. A changing magnetic field induces an induced current in the coil, which in turn charges the device.

[0003] Publication No. CN112735770A discloses a dual-layer wireless charging coil comprising a first coil and a second coil connected in series via an adapter plate. Each coil comprises N strands of parallel-wound enameled wire, where N is a natural number greater than 1. The adapter plate's upper and lower layers each include N soldering pads. The N soldering pads on the upper layer are soldered to the N strands of enameled wire in the first coil, while the N soldering pads on the lower layer are soldered to the N strands of enameled wire in the second coil.

[0004] In the above-mentioned double-layer wireless charging coil, soldering by pads is required to achieve electrical connection between the wires in the upper and lower layers of the coil, which increases the difficulty of manufacturing the double-layer wireless charging coil. Utility Model Content

[0005] The purpose of the present invention is to overcome the above technical deficiencies and to provide a wireless charging coil and a charging device to solve the technical problem in the prior art of requiring welding to achieve electrical connection of the wires in the upper and lower layers of the coil.

[0006] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a wireless charging coil, comprising:

[0008] A magnetic conductive component, including a magnetic conductive sheet; and

[0009] A conductive wire, wherein a section of the conductive wire is wound along a first direction to form a spiral first coil, and another section of the conductive wire is wound along a second direction to form a spiral second coil, the first direction and the second direction are opposite, the first coil and the second coil have opposite rotation directions and are arranged in sequence on the magnetic conductive sheet, and the first coil is connected to the magnetic conductive sheet.

[0010] In one embodiment, the conductive wire is a flat wire.

[0011] In one embodiment, the magnetic conductive component further includes an adhesive layer, which is disposed between the magnetic conductive sheet and the first coil and connects the magnetic conductive sheet and the first coil.

[0012] In one embodiment, the magnetic core is trapezoidal, diamond-shaped or circular.

[0013] In one embodiment, both the first coil and the second coil are annular structures.

[0014] In one embodiment, the axial projections of the first coil and the second coil are located within the end surface of the magnetic conductive sheet, and the distance between the peripheral walls of the first coil and the second coil and the peripheral wall of the magnetic conductive sheet is greater than or equal to 0.5 mm.

[0015] In one embodiment, two lead wires are further included, and the two lead wires are respectively connected to two ends of the wire.

[0016] In one embodiment, the lead wire is an enameled wire, the end of the lead wire facing away from the conductor is stripped of paint, and the stripped portion of the lead wire is provided with a tinned layer or crimped with a conductive terminal.

[0017] In one embodiment, two sleeves are further included, and the two sleeves are respectively sleeved on the two lead wires.

[0018] In a second aspect, the present invention further provides a charging device comprising the above-mentioned wireless charging coil.

[0019] Compared with the prior art, the wireless charging coil and charging device provided by the present invention have opposite winding directions for the first coil and the second coil, and are wound using the same wire. The connection between the first coil and the second coil is in an "α" shape, so the first coil and the second coil can be connected without welding, which reduces the welding process and the processing difficulty. Secondly, by winding the first coil and the second coil on a magnetic core, the magnetic core can be used for winding the first coil and the second coil, and can enhance and focus the magnetic field, thereby improving energy transmission efficiency. The first coil and the second coil have opposite winding directions, so that the magnetic fields generated by the first coil and the second coil are superimposed on each other in space instead of canceling each other out. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a wireless charging coil provided by an embodiment of the present utility model;

[0021] Figure 2 yes Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0022] Figure 3 This is a schematic structural diagram of a wireless charging coil provided by an embodiment of the present utility model;

[0023] Figure 4This is a structural diagram of a magnetic conductive component in a wireless charging coil provided by an embodiment of the present invention;

[0024] Figure 5 This is a structural diagram of the wire, the first coil, and the second coil in the wireless charging coil provided in one embodiment of the present utility model;

[0025] Figure 6 yes Figure 5 A partial enlarged schematic diagram of point B in the middle.

[0026] Description of reference numerals:

[0027] Magnetic conductive component 1;

[0028] Magnetic conductive sheet 11;

[0029] Adhesive layer 12;

[0030] Wire 2;

[0031] First coil 21;

[0032] Second coil 22;

[0033] Lead wire 3;

[0034] Casing 4. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] In order to solve the technical problem of needing to achieve electrical connection of wires in upper and lower layers of coils by welding, the utility model provides a wireless charging coil and a charging device, which can achieve electrical connection of upper and lower layers of coils without welding.

[0037] It should be noted that the wireless charging coil described in the present invention is used for but not limited to charging devices, etc. For the sake of convenience, in the present invention, only the application of the wireless charging coil to the charging device is used as an example for explanation. The wireless charging coil can be used in wireless charging transmitters and wireless charging receivers, and can be widely used in medical equipment, household appliances, mobile devices, etc. The principles are essentially the same as those used in charging, so they will not be elaborated here.

[0038] See also Figure 2 , Figure 2This is a partial structural schematic diagram of a wireless charging coil in one embodiment of the present invention. A wireless charging coil includes a magnetic conductive component 1 and a conductor 2. The magnetic conductive component 1 includes a magnetic conductive sheet 11. A section of the conductor 2 is wound around the magnetic conductive core 11 along a first direction to form a spiral first coil 21, and another section of the conductor 2 is wound around the magnetic conductive core 11 along a second direction to form a spiral second coil 22. The first direction and the second direction are opposite. The first coil 21 and the second coil 22 have opposite rotation directions and are arranged in sequence on the magnetic conductive sheet 11. The first coil 21 is connected to the magnetic conductive sheet 11.

[0039] Specifically, such as Figure 5 and Figure 6 As shown, since the winding directions of the first coil 21 and the second coil 22 are opposite, and the first coil 21 and the second coil 22 are wound with the same wire 2, the connection between the first coil 21 and the second coil 22 is in an "α" shape, and the first coil 21 and the second coil 22 can be formed without welding, which reduces the welding process and reduces the processing difficulty; secondly, by winding the first coil 21 and the second coil 22 on the magnetic core 11, the magnetic core 11 can be used for winding the first coil 21 and the second coil 22, and can enhance and focus the magnetic field, thereby improving the energy transmission efficiency; the winding directions of the first coil 21 and the second coil 22 are opposite, so that the magnetic fields generated by the first coil 21 and the second coil 22 are superimposed on each other in space instead of canceling each other out; the first coil 21 and the second coil 22 are arranged on the magnetic sheet 11, and the first coil 21 is connected to the magnetic sheet 11. The magnetic sheet 11 can concentrate and guide the magnetic field, so that the magnetic field is more concentrated in the effective area of ​​the coil, reducing scattering to the surrounding environment and improving the energy transmission efficiency; and can fix and limit the wire 2.

[0040] The first direction and the second direction are clockwise and counterclockwise respectively, or the first direction and the second direction are counterclockwise and clockwise respectively.

[0041] It should be understood that the conductor 2 can be a round wire, a flat wire, etc. Specifically, in one embodiment, the conductor 2 is a flat wire.

[0042] The flat wire is wound to form the first coil 21 and the second coil 22, which can reduce the gap between the wires 2. When forming a magnetic field of the same specification, the volume required by the flat wire is smaller, which can reduce the volume of the wireless charging coil.

[0043] It should be understood that the first coil 21 and the second coil 22 can be fixed to the magnetic conductive sheet 11 by bonding, clamping and screw connection. Specifically, Figure 2 and Figure 4 As shown, in one embodiment, the magnetic conductive component 1 further includes an adhesive layer 12 . The adhesive layer 12 is disposed between the magnetic conductive sheet 11 and the first coil 21 , and connects the magnetic conductive sheet 11 and the first coil 21 .

[0044] By providing the adhesive layer 12 , the adhesive layer 12 can fix the first coil 21 on the magnetic conductive sheet 11 by bonding, thereby achieving fixation of the first coil 21 and the second coil 22 relative to the magnetic conductive sheet 11 .

[0045] The adhesive layer 12 may be formed by solidifying liquid glue, or may be a solid adhesive.

[0046] The adhesive layer 12 may be in the shape of a ring, a trapezoid, a circle, a dot, a block, or the like.

[0047] like Figure 1 、 Figure 3 and Figure 4 As shown, in one embodiment, the magnetic core 11 is in a trapezoidal, diamond-shaped or circular shape. Specifically, in one embodiment, the magnetic core 11 is in a trapezoidal shape.

[0048] like Figure 3 and Figure 4 As shown, in one embodiment, the first coil 21 and the second coil 22 are both annular structures.

[0049] By configuring the first coil 21 and the second coil 22 to be annular structures, the annular coil can achieve a more uniform magnetic field distribution; the annular coil can more effectively reduce the influence of the skin effect than a solid coil.

[0050] In one embodiment, the magnetic conductive component 1 further includes a magnetic conductive core (not shown in the figure), which is fixed to one end of the magnetic conductive sheet 11 and connected to the magnetic conductive sheet 11, and the first coil 21 and the second coil 22 are sleeved on the magnetic conductive core.

[0051] By setting up a magnetic core, the magnetic core can concentrate and enhance the magnetic field, and at the same time, the wire 2 can be wound around the magnetic core to form the first coil 21 and the second coil 22, which facilitates the winding and fixing of the first coil 21 and the second coil 22, and can also prevent the first coil 21 and the second coil 22 from deforming toward the center position.

[0052] The magnetic core is a cylindrical structure with a trapezoidal cross section.

[0053] like Figure 2 As shown, in one embodiment, the height of the magnetic core 11 along the axial direction is lower than the sum of the heights of the first coil 21 and the second coil 22 along the axial direction.

[0054] Through the above arrangement, the magnetic core 11 can be prevented from protruding from the coil, and the volume occupied by the magnetic core 11 can be reduced.

[0055] Since the first coil 21 and the magnetic conductive sheet 11 are connected by bonding, in order to facilitate the installation and fixation of the charging coil and prevent incorrect installation, in one embodiment, the axial projection of the first coil 21 and the second coil 22 is located within the end surface of the magnetic conductive sheet 11, and the distance between the peripheral wall of the first coil 21 and the second coil 22 and the peripheral wall of the magnetic conductive sheet 11 is greater than or equal to 0.5 mm.

[0056] When the first coil 21 and the second coil 22 are fixed to the magnetic conductive sheet 11 by bonding, since the axial projections of the first coil 21 and the second coil 22 are located within the end surface of the magnetic conductive sheet 11, the projection size of the first coil 21 and the second coil 22 is smaller than the end surface size of the magnetic conductive sheet 11, so that the magnetic conductive sheet 11 has sufficient size to install the first coil 21 and the second coil 22, avoiding the first coil 21 and the second coil 22 from exceeding the magnetic conductive sheet 11 during installation, and avoiding installation errors of the first coil 21 and the second coil 22; secondly, since the distance between the peripheral wall of the first coil 21 and the second coil 22 and the peripheral wall of the magnetic conductive sheet 11 is greater than or equal to 0.5 mm, the end surface of the magnetic conductive sheet 11 has sufficient size to install the first coil 21 and the second coil 22, and the installation position of the first coil 21 and the second coil 22 needs to be controlled with high precision to facilitate the installation and fixation of the first coil 21 and the second coil 22.

[0057] like Figure 1 and Figure 3 As shown, in one embodiment, the wireless charging coil further includes two lead wires 3 , and the two lead wires 3 are respectively connected to two ends of the wire 2 .

[0058] By providing the lead wires 3 , the lead wires 3 can realize the connection between the first coil 21 and the second coil 22 and an external device.

[0059] The lead wire 3 and the conductor 2 can be formed by directly leading out the conductor 2 , or by additionally providing the lead wire 3 and then connecting the lead wire 3 to the conductor 2 .

[0060] In one embodiment, the lead wire 3 is an enameled wire, the end of the lead wire 3 facing away from the conductor 2 is stripped of paint, and the stripped paint portion of the lead wire 3 is provided with a tinned layer (not shown in the figure) or crimped with a conductive terminal (not shown in the figure).

[0061] After the paint is removed, the end of the lead wire 3 is connected to the external circuit through the tinned layer or the conductive terminal, which reduces the contact resistance and improves the conductive performance.

[0062] like Figure 1 and Figure 3 As shown, in one embodiment, the wireless charging coil further includes two sleeves 4 , and the two sleeves 4 are respectively sleeved on the two lead wires 3 .

[0063] By adding a sleeve 4 to the lead wire 3, this embodiment not only improves the performance of the wireless charging coil, but also enhances its stability and reliability in practical applications, while providing better protection and maintenance convenience; the sleeve 4 has good insulation performance, which can prevent short circuits between the lead wires 3 and improve the safety and reliability of the coil.

[0064] It should be understood that the material of the sleeve 4 can be insulating plastic, silicone, etc.

[0065] The utility model also provides a charging device, comprising the above-mentioned wireless charging coil.

[0066] It should be understood that the wireless charging coil can be used as a transmitting coil or a receiving coil during charging.

[0067] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A wireless charging coil, characterized in that: include: A magnetic conductive component, including a magnetic conductive sheet; and A conductive wire, wherein a section of the conductive wire is wound along a first direction to form a spiral first coil, and another section of the conductive wire is wound along a second direction to form a spiral second coil, the first direction and the second direction are opposite, the first coil and the second coil have opposite rotation directions and are arranged in sequence on the magnetic conductive sheet, and the first coil is connected to the magnetic conductive sheet.

2. The wireless charging coil according to claim 1, wherein: The conductive wire is a flat wire.

3. The wireless charging coil according to claim 1, wherein: The magnetic conductive component further includes an adhesive layer, which is disposed between the magnetic conductive sheet and the first coil and connects the magnetic conductive sheet and the first coil.

4. The wireless charging coil according to claim 1, wherein: The magnetic core is in a trapezoidal, rhombic or circular shape.

5. The wireless charging coil according to claim 1, wherein: The first coil and the second coil are both ring-shaped structures.

6. The wireless charging coil according to claim 5, wherein: The axial projections of the first coil and the second coil are located within the end surface of the magnetic conductive sheet, and the distance between the peripheral walls of the first coil and the second coil and the peripheral wall of the magnetic conductive sheet is greater than or equal to 0.5 mm.

7. The wireless charging coil according to claim 1, wherein: It also includes two lead wires, which are respectively connected to the two ends of the wire.

8. The wireless charging coil according to claim 7, wherein: The lead wire is an enameled wire, the end of the lead wire facing away from the conductor is stripped of paint, and the stripped paint portion of the lead wire is provided with a tinned layer or crimped with a conductive terminal.

9. The wireless charging coil according to claim 7, wherein: It also includes two sleeves, which are respectively sleeved on the two lead-out wires.

10. A charging device, characterized in that: The wireless charging coil comprises the wireless charging coil as claimed in any one of claims 1 to 9.

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