Coil connection structure and charging equipment

Abstract

The embodiment of the utility model relates to the technical field of wireless charging, and discloses a coil connecting structure and charging equipment, the coil connecting structure comprises an insulating substrate, a coil assembly and a connecting assembly, the insulating substrate comprises a first surface and a second surface which are oppositely arranged, the coil assembly is arranged on the insulating substrate, and the connecting assembly is arranged on the first surface. The coil assembly comprises a plurality of coil units, one coil unit forms a continuous first circuit on the first surface, one coil unit forms a discontinuous second circuit on the second surface, the connecting assembly is arranged between the coil units, and the connecting assembly is arranged between the coil units. The connecting assembly is used for electrically connecting the first circuit and the second circuit in series. By means of the mode, the number of turns and the number of strands of the coil can be increased, and the inductance value and the impedance performance are improved.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and in particular to a coil connection structure and a charging device. Background Technology

[0002] In the field of wireless charging technology applications, the integration of the WPC (Wireless Power Consortium) standard and NFC (Near Field Communication) technology has become an important technological development trend. In existing technologies, when implementing a combined design of a WPC charging coil and an NFC antenna, the structural characteristic of the NFC antenna requiring simultaneous wiring in both the innermost and outermost rings dictates that the WPC charging coil can only be connected in parallel on both sides.

[0003] During the implementation of this application's embodiments, the inventors discovered that: the number of turns and strands of the coil is strictly limited, making it difficult to meet the inductance requirements in practical applications; secondly, the parallel structure makes it difficult for the coil's impedance characteristics to reach the design expectation value, affecting the overall performance of the charging system. Utility Model Content

[0004] The main technical problem solved by the embodiments of this application is to provide a coil connection structure that can increase the number of turns and strands of the coil, thereby improving the inductance and impedance performance.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application embodiment is: to provide a coil connection structure, including an insulating substrate, a coil assembly, and a connecting assembly. The insulating substrate includes a first surface and a second surface disposed opposite to each other. The coil assembly is disposed on the insulating substrate and includes a plurality of coil units. One coil unit forms a continuous first line on the first surface, and another coil unit forms a discontinuous second line on the second surface. The connecting assembly is disposed between the coil units and is used to connect the first line and the second line in series.

[0006] Optionally, the connection assembly includes a through-hole penetrating the insulating substrate, one end of which is electrically connected to the first line and the other end of which is electrically connected to the second line, and the through-hole is used to form a series circuit.

[0007] Optionally, the via is provided with a conductive layer, the thickness of which ranges from 15 to 25 micrometers.

[0008] Optionally, the coil assembly includes an outer coil unit and an inner coil unit, the outer coil unit and the inner coil unit being concentrically arranged.

[0009] Optionally, the coil assembly further includes a central coil unit disposed between the outer coil unit and the inner coil unit, the central coil unit being used to realize wireless charging.

[0010] Optionally, the first line and the second line have the same line width and are uniformly arranged in the radial direction.

[0011] Optionally, the second line further includes a plurality of discontinuous segments, with a predetermined spacing between adjacent discontinuous segments, the predetermined spacing being used to adjust the inductance of the coil assembly.

[0012] Optionally, the predetermined spacing increases sequentially along the extension direction of the second line.

[0013] Optionally, the coil assembly further includes a protective layer disposed on the first surface and the second surface, the protective layer having a thickness of 2-4 micrometers, the protective layer being used to provide insulation protection.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide a charging device, including the coil connection structure described in any of the above claims.

[0015] This application provides a coil connection structure, including an insulating substrate, a coil assembly, and a connecting assembly. The insulating substrate includes a first surface and a second surface disposed opposite to each other. The coil assembly is disposed on the insulating substrate and includes multiple coil units. One coil unit forms a continuous first line on the first surface, and another coil unit forms a discontinuous second line on the second surface. The connecting assembly is disposed between the coil units and is used to connect the first line and the second line in series. By setting the coil assembly on both sides of the insulating substrate and using the connecting assembly to achieve the series connection, the coil assembly is more flexible and efficient in spatial layout. Due to the current characteristics of the series connection, the effective number of turns and strands of the coil is increased, thereby increasing the inductance of the coil. At the same time, the series structure makes the current distribution in the line more uniform, effectively improving the impedance characteristics. In addition, this design makes full use of the double-sided space of the insulating substrate, achieving an overall improvement in wireless charging performance without increasing device size and manufacturing cost, and has significant practical value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the coil connection structure according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the insulating substrate according to an embodiment of this application;

[0019] Figure 3 This is another schematic diagram of the coil connection structure of the insulating substrate according to an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the second circuit in an embodiment of this application;

[0021] Figure 5 This is another schematic diagram of the insulating substrate coil connection structure in an embodiment of this application. Detailed Implementation

[0022] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0024] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see Figures 1-4The coil connection structure 1 includes an insulating substrate 10, a coil assembly 20, and a connecting assembly 30. The insulating substrate 10 is a double-sided copper-clad printed circuit board with a first surface and a second surface arranged opposite to each other. In this embodiment, the insulating substrate 10 is made of FPC (flexible printed circuit board) material, with a substrate thickness of 12.5 micrometers. Considering the characteristics of FPC material, special attention needs to be paid to the rolling direction and bending direction of the material in practical applications. Specifically, the wiring direction of the coil should be consistent with the rolling direction of the FPC material. This ensures good flexibility and reliability of the circuit when bent. At the same time, excessive bending should be avoided during bending operations, and the bending angle should not exceed 90 degrees to prevent cracking of the substrate or damage to the conductive layer.

[0026] In some embodiments, to ensure product reliability during manufacturing, the processing parameters of the FPC material need to be strictly controlled. The lamination temperature should be controlled within the range of 150-170℃, and the lamination pressure should preferably be controlled within 2-3MPa. When etching the circuit lines, the thermal expansion characteristics of the material should be fully considered, and an appropriate compensation amount should be reserved to ensure the accuracy of the finished product dimensions.

[0027] The coil assembly 20 includes multiple coil units 21, which form specific circuit layouts on a first surface and a second surface of the insulating substrate 10. Specifically, one coil unit 21 forms a continuous first line 22 on the first surface, and another coil unit 21 forms a discontinuous second line 23 on the second surface. The first line 22 is continuously distributed in a ring structure, and the line width of the first line 22 is 0.15 mm; the second line 23 adopts a discontinuous layout, including multiple discontinuous segments, and the line width of the second line 23 is also 0.15 mm to ensure consistent conductivity.

[0028] The connecting component 30 includes multiple through holes 31 penetrating the insulating substrate 10. One end of each through hole 31 is electrically connected to a first line 22 on a first surface, and the other end is electrically connected to a second line 23 on a second surface, thereby forming a complete series circuit. In terms of manufacturing process, the through holes 31 are formed by precision drilling with a diameter of 0.3 mm. A conductive layer (not shown) is formed on the inner wall through electroplating. The conductive layer is made of pure copper, and its thickness is controlled within the range of 15-25 micrometers, preferably 20 micrometers. This configuration not only ensures reliable conductivity of the through holes 31 but also provides sufficient mechanical strength. In this embodiment, the layout of the through holes 31 is optimized, evenly distributed at the connection points of the coil units 21, allowing current to flow more evenly in the circuit and effectively reducing localized heating. Simultaneously, the distance between adjacent through holes 31 is maintained at more than 2 mm. This spacing design ensures full utilization of the wiring space and avoids affecting the substrate strength due to excessively close hole spacing.

[0029] The coil connection structure 1 in this embodiment has the following technical advantages: First, by setting lines on both sides of the insulating substrate 10 and connecting them in series using through holes 31, the equivalent number of turns of the coil is effectively increased, and the inductance is improved; Second, the thickness design of the conductive layer ensures that the through holes 31 have stable conductivity and reduces contact resistance; Third, the overall structure design is compact, with high space utilization, and no additional components and process costs are required.

[0030] Please see Figure 5 In this embodiment, the coil assembly 20 includes an outer coil unit 24, an inner coil unit 25, and a central coil unit 26, which are arranged concentrically to form a complete three-ring structure system. The size parameters of the outer coil unit 24 and the inner coil unit 25 are designed according to the requirements of the NFC communication standard, while the size of the central coil unit 26 is determined according to the WPC wireless charging standard. In addition, an appropriate electromagnetic isolation distance is reserved between each coil unit to reduce mutual interference.

[0031] In some embodiments, the first line 22 and the second line 23 use the same line width and maintain a uniform line spacing. Specific parameters can be adjusted according to actual application requirements, provided that impedance matching and inductance requirements are met. Specifically, in some preferred embodiments, the first line 22 and the second line 23 use the same line width design, both 0.15mm, and the two lines are uniformly arranged in the radial direction with a line spacing maintained at 0.15mm. This uniform wiring method not only helps improve the consistency of the manufacturing process but also ensures the uniformity of the electromagnetic field distribution. In particular, the central coil unit 26 is specifically designed to implement wireless charging functionality, and its coil turns are optimized to achieve the best energy transfer efficiency within a charging power range of 5-15W.

[0032] In this embodiment, the second line 23 includes several discontinuous segments (not shown), and a predetermined spacing is provided between adjacent discontinuous segments (not shown). By adjusting the size of the predetermined spacing, the inductance range of the coil can be precisely controlled. Specifically, the predetermined spacing increases gradually along the extension direction of the second line 23, that is, the spacing gradually increases from the inside of the coil to the outside. This gradual spacing design can optimize the current distribution in the coil and effectively reduce eddy current losses.

[0033] In this embodiment, to improve product reliability and lifespan, a protective layer is provided on both the first and second surfaces of the coil assembly 20. The protective layer is made of insulating material, and its thickness is controlled within the range of 2-4 micrometers. The protective layer not only provides necessary insulation protection but also effectively prevents circuit oxidation, enabling the product to maintain stable performance even under high temperature and high humidity environments.

[0034] The protective layer not only provides insulation but also needs to be flexible enough to accommodate the bending requirements of the FPC material during use. Therefore, the selection of materials and the coating process for the protective layer must take into account its flexibility requirements.

[0035] This application provides a coil connection structure 1, including an insulating substrate 10, a coil assembly 20, and a connecting assembly 30. The insulating substrate 10 includes a first surface and a second surface disposed opposite to each other. The coil assembly 20 is disposed on the insulating substrate 10 and includes a plurality of coil units 21. One coil unit 21 forms a continuous first line 22 on the first surface, and another coil unit 21 forms a discontinuous second line 23 on the second surface. The connecting assembly 30 is disposed between the coil units 21 and is used to connect the first line 21 and the second line 22 in series. By setting the coil assembly 20 on both sides of the insulating substrate 10 and using the connecting assembly 30 to achieve the series connection structure design, the coil assembly 20 is more flexible and efficient in spatial layout. Due to the current characteristics of the series connection, the effective number of turns and strands of the coil is increased, thereby increasing the inductance of the coil. At the same time, the series structure makes the current distribution in the line more uniform, effectively improving the impedance characteristics. Furthermore, this design makes full use of the double-sided space of the insulating substrate 10, achieving an overall improvement in wireless charging performance without increasing device size and manufacturing costs, and has significant practical value.

[0036] This application also provides an embodiment of a charging device, wherein the cleaning system includes the coil connection structure 1 described above. For the specific structure and function of the charging device, please refer to the above embodiments, which will not be repeated here.

[0037] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A coil connection structure, characterized in that, include: An insulating substrate includes a first surface and a second surface disposed opposite to each other; A coil assembly is disposed on the insulating substrate. The coil assembly includes a plurality of coil units, one of which forms a continuous first line on the first surface and another coil unit forms a discontinuous second line on the second surface. A connecting component is disposed between the coil units.

2. The coil connection structure according to claim 1, characterized in that, The connection assembly includes a through-hole penetrating the insulating substrate. One end of the through-hole is electrically connected to the first line, and the other end is electrically connected to the second line. The through-hole is used to form a series circuit.

3. The coil connection structure according to claim 2, characterized in that, The via is provided with a conductive layer, the thickness of which ranges from 15 to 25 micrometers.

4. The coil connection structure according to claim 1, characterized in that, The coil assembly includes an outer coil unit and an inner coil unit, which are arranged concentrically.

5. The coil connection structure according to claim 4, characterized in that, The coil assembly further includes a central coil unit disposed between the outer coil unit and the inner coil unit, the central coil unit being used to realize wireless charging.

6. The coil connection structure according to claim 1, characterized in that, The first line and the second line have the same line width and are evenly arranged in the radial direction.

7. The coil connection structure according to claim 1, characterized in that, The second line also includes multiple discontinuous segments, with a predetermined spacing between adjacent discontinuous segments, the predetermined spacing being used to adjust the inductance of the coil assembly.

8. The coil connection structure according to claim 7, characterized in that, The predetermined spacing increases sequentially along the extension direction of the second line.

9. The coil connection structure according to claim 1, characterized in that, The coil assembly further includes a protective layer disposed on the first surface and the second surface, the protective layer having a thickness of 2-4 micrometers, the protective layer being used to provide insulation protection.

10. A charging device, characterized in that, Includes the coil connection structure as described in any one of claims 1-9.

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