Double-layer wireless charging coil with even number of turns

Abstract

The utility model relates to the technical field of wireless charging coils, and discloses an even-number-turn double-layer wireless charging coil which comprises a first wireless charging wire layer and a second wireless charging wire layer which are correspondingly and horizontally attached. The first wireless charging wire layer comprises a first sub-wire turn and a second sub-wire turn, and the first sub-wire turn and the second sub-wire turn are parallel and spirally arranged to a first working turn number; the first head end of the first sub-wire turn is connected with the second head end of the second sub-wire turn, the first tail end of the first sub-wire turn is connected with the second wireless charging wire layer after the first sub-wire turn is spirally arranged to a first working number of turns, and the second tail end of the second sub-wire turn is connected with the second wireless charging wire layer after the second sub-wire turn is spirally arranged to a first working number of turns. And the first wireless charging wire layer continues to be spirally arranged along the inner circle of the first wireless charging wire layer, and is connected with the second wireless charging wire layer after being spirally arranged to a second working circle number. While the performance of the wireless charging coil is ensured, the winding area of the wireless charging coil is optimized, and the internal space of the intelligent terminal is saved.

Description

Technical Field

[0001] This application relates to the technical field of wireless charging coils, and particularly to a double-layer wireless charging coil with an even number of turns. Background Art

[0002] With the miniaturization development of intelligent terminal electronic products, wireless charging coils have become an essential part of intelligent terminals (such as smart phones or smart watches). Wireless charging technology refers to the use of principles such as electromagnetic induction and magnetic field resonance to transmit energy in the form of a magnetic field, and there is no need for a wire connection between the charging device and the power-consuming device. In related technologies, the application area of the wireless charging coil is usually a closed surface such as a circle or a rectangle. However, when there are many parts in the intelligent terminal device and the available area is relatively limited, it cannot provide the entire area for the wireless charging coil, and the wireless charging coil can only be prepared into an annular structure. Then, it is very easy for the inner or outer side of the annular wireless charging coil to exceed the preset annular space of the intelligent terminal device. Therefore, how to reduce the winding area of the coil while ensuring the performance of the wireless charging coil and provide more space for other parts in the wireless charging device of the intelligent terminal has become an urgent technical problem to be solved. Summary of the Utility Model

[0003] In view of this, this application provides a double-layer wireless charging coil with an even number of turns to optimize its winding area while ensuring the performance of the wireless charging coil and save the internal space of the intelligent terminal.

[0004] To achieve the above object, the technical solution adopted is as follows:

[0005] A double-layer wireless charging coil with an even number of turns is used for wirelessly charging an intelligent terminal during application, and includes:

[0006] A first wireless charging wire layer and a second wireless charging wire layer, and the first wireless charging wire layer and the second wireless charging wire layer are horizontally attached correspondingly;

[0007] The first wireless charging wire layer includes a first sub-wire turn and a second sub-wire turn, and the first sub-wire turn and the second sub-wire turn are arranged in parallel and in a spiral pattern with a gap to the first number of working turns to construct the annular structure of the first wireless charging wire layer;

[0008] Moreover, the first head end of the first sub-wire turn is connected to the second head end of the second sub-wire turn. After the first sub-wire turn is spirally arranged to the first number of working turns, the first tail end of the first sub-wire turn is connected to the second wireless charging wire layer. After the second sub-wire turn is spirally arranged to the first number of working turns, the second tail end of the second sub-wire turn continues to be spirally arranged along the inner circle of the first wireless charging wire layer, and after being spirally arranged to the second number of working turns, it is connected to the second wireless charging wire layer.

[0009] The present application is further configured such that: the structures of the first wireless charging line layer and the second wireless charging line layer are the same and are mirror images of each other.

[0010] The present application is further configured such that: the second number of working turns includes 0.5 turn or 1 turn.

[0011] The present application is further configured such that: both the first sub-wire turn and the second sub-wire turn are single-wire turn coils.

[0012] The present application is further configured such that: both the first sub-wire turn and the second sub-wire turn are double-wire turn coils.

[0013] The present application is further configured such that: the first wireless charging line layer further includes a starting portion, the starting portion is integrally connected to the first leading end of the first sub-wire turn and the second leading end of the second sub-wire turn, and a feeder pin extends from one side of the starting portion.

[0014] The present application is further configured such that: from the outer circle of the first wireless charging line layer to the inner circle of the first wireless charging line layer, the first sub-wire turn and the second sub-wire turn are alternately arranged, and a bending portion is provided at a position close to the first trailing end of the first sub-wire turn on the second sub-wire turn, and the bending portion bends towards the first trailing end of the first sub-wire turn from the inner circle of the first wireless charging line layer to the outer circle of the first wireless charging line layer, so as to further utilize the space after the first trailing end of the first sub-wire turn.

[0015] The present application is further configured such that: the first wireless charging line layer and the second wireless charging line layer are connected in series.

[0016] The present application is further configured such that: the first wireless charging line layer and the second wireless charging line layer are connected in parallel, and the second wireless charging line layer includes alternately arranged third sub-wire turns and fourth sub-wire turns with breaks, and two ends of the third sub-wire turn are respectively connected to the first sub-wire turn, and two ends of the fourth sub-wire turn are respectively connected to the second sub-wire turn.

[0017] The present application is further configured such that: the double-layer wireless charging coil with an even number of turns is an FPC wireless charging coil.

[0018] In summary, compared with the prior art, the present application discloses a double-layer wireless charging coil with an even number of turns, including a first wireless charging wire layer and a second wireless charging wire layer that are horizontally attached to each other. Among them, the first sub-turn and the second sub-turn of the first wireless charging wire layer are arranged in parallel and spirally with a gap to the first number of working turns. Moreover, the first head end of the first sub-turn is connected to the second head end of the second sub-turn. After the first tail end of the first sub-turn is spirally arranged to the first number of working turns, it is connected to the second wireless charging wire layer. After the second tail end of the second sub-turn is spirally arranged to the first number of working turns, it continues to be spirally arranged along the inner circle of the first wireless charging wire layer, and after being spirally arranged to the second number of working turns, it is connected to the second wireless charging wire layer. That is, through the above settings, while ensuring the performance of the wireless charging coil, the winding area is optimized, and the internal space of the smart terminal is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the first double-layer wireless charging coil with an even number of turns of the present application;

[0021] Figure 2 It is a top view structure schematic diagram of the first double-layer wireless charging coil with an even number of turns of the present application;

[0022] Figure 3 It is a three-dimensional structure schematic diagram of the second double-layer wireless charging coil with an even number of turns of the present application;

[0023] Figure 4 It is a top view structure schematic diagram of the second double-layer wireless charging coil with an even number of turns of the present application;

[0024] Figure 5 It is a three-dimensional structure schematic diagram of the third double-layer wireless charging coil with an even number of turns of the present application;

[0025] Figure 6 It is a top view structure schematic diagram of the third double-layer wireless charging coil with an even number of turns of the present application;

[0026] Figure 7 It is a three-dimensional structure schematic diagram of the fourth double-layer wireless charging coil with an even number of turns of the present application;

[0027] Figure 8 It is a top view structure schematic diagram of the fourth double-layer wireless charging coil with an even number of turns of the present application. Detailed implementation manners

[0028] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0029] It should be noted that in this document, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of additional identical elements in the process, method, article or device including that element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or may have different meanings, and their specific meanings need to be determined based on their explanations in the specific embodiments or further in combination with the context of the specific embodiments.

[0030] It should be understood that the specific embodiments described herein are merely used to explain the present application and are not used to limit the present application.

[0031] In subsequent descriptions, suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of describing the present application, and they have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used interchangeably.

[0032] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] The technical solutions shown in the present application will be described in detail below through specific embodiments. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0034] Please refer to Figure 1 、Figure 3 、 Figure 5 or Figure 7 When the double - layer wireless charging coil with even turns of the present application is applied for wireless charging of a smart terminal, it includes a first wireless charging wire layer 1 and a second wireless charging wire layer 2.

[0035] In the specific implementation process, the first wireless charging wire layer 1 and the second wireless charging wire layer 2 are horizontally attached correspondingly, so as to improve the magnetic field coupling efficiency of the wireless charging coil and optimize the utilization rate of the internal space of the smart terminal at the same time.

[0036] Furthermore, the first wireless charging wire layer 1 includes a first sub - wire turn 11 and a second sub - wire turn 12. The first sub - wire turn 11 and the second sub - wire turn 12 are arranged in a parallel and spaced - apart spiral pattern up to the first number of working turns to construct the annular structure of the first wireless charging wire layer 1, so as to form a more uniform magnetic flux distribution, reduce the local high - magnetic - flux - density region, thereby reducing eddy current loss and improving the charging efficiency. That is, by adopting the parallel sub - wire turn design, the current can be more evenly distributed among different turns, reducing the current deviation caused by the skin effect, and then optimizing the quality factor (Q value) of the coil.

[0037] Among them, the first head end 11a of the first sub - wire turn 11 is connected to the second head end 12a of the second sub - wire turn 12 to start from a common source point. After the first sub - wire turn 11 is spirally arranged to the first number of working turns, the first tail end 11b of the first sub - wire turn 11 is connected to the second wireless charging wire layer 2. After the second sub - wire turn 12 is spirally arranged to the first number of working turns, the second tail end 12b of the second sub - wire turn 12 continues to be spirally arranged along the inner circle of the first wireless charging wire layer 1, and after being spirally arranged to the second number of working turns, it is connected to the second wireless charging wire layer 2. Thus, the winding area of the coil can be further optimized, the induced voltage can be increased under the same coil size, the charging loss can be reduced, and the magnetic field uniformity can also be optimized, reducing the "charging dead angle", so as to optimize the area utilization rate of the wireless charging coil while ensuring the wireless charging efficiency, saving the internal space of the smart terminal and meeting the development requirements of the miniaturization of the smart terminal.

[0038] Reference Figures 1 to 6, for the double - layer wireless charging coil with an even number of turns in this application, the structures of the first wireless charging wire layer 1 and the second wireless charging wire layer 2 are the same and are mirror images of each other. Therefore, the structure of the second wireless charging wire layer 2 will not be elaborated here. Then, the mirror - image structure design of the first wireless charging wire layer 1 and the second wireless charging wire layer 2 can optimize the magnetic field distribution of the double - layer wireless charging coil with an even number of turns, enabling the current direction and the magnetic flux direction to form a good complementary effect, reducing parasitic inductance, and improving charging stability. That is, this mirror - image design can improve the magnetic flux linking ability of the receiving - end coil under the same size, optimize energy transmission, and through the mirror - image structure, the inter - layer capacitance of the double - layer wireless charging coil can be more balanced, reducing high - frequency losses, increasing the Q value, and enhancing the overall performance of wireless charging. Moreover, due to the mirror - image design of the first wireless charging wire layer 1 and the second wireless charging wire layer 2, it can effectively reduce electromagnetic interference (EMI) caused by uneven electric fields, which is crucial for optimizing the electromagnetic compatibility (EMC) of small devices such as smartphones and smart watches.

[0039] Furthermore, the first wireless charging wire layer 1 further includes a starting portion 13. The starting portion 13 is integrally connected to the first leading end 11a of the first sub - wire turn 11 and the second leading end 12a of the second sub - wire turn 12. And on one side of the starting portion 13, a feeder pin 14 extends. Thus, it can ensure that the current flows in from a stable starting point, reducing the parasitic effect caused by uneven winding paths, and directly shunting from the starting portion 13 to the first sub - wire turn 11 and the second sub - wire turn 12, avoiding the increase in parasitic inductance caused by uneven current distribution, increasing the Q value of the wireless charging coil, and thus improving the transmission efficiency.

[0040] Among them, the feeder pin 14 adopts a reinforced pad or a flexible structure design to prevent cracking caused by repeated bending and improve its durability.

[0041] It should be noted that the double - layer wireless charging coil with an even number of turns is an FPC wireless charging coil to meet the requirements of ultra - thin and flexible designs, enabling the wireless charging coil to better adapt to the limited space inside devices such as smart terminals (such as smartphones and smart watches), effectively reducing the thickness inside the device. At the same time, through the FPC manufacturing process, the wireless charging coil can be integrated with other circuit modules (such as control chips and matching circuits) on one board, simplifying the overall system design, reducing connection points, and improving reliability. Moreover, FPC has excellent graphic etching and precise wiring capabilities, enabling precise control of the winding pitch, wire diameter of the coil, and the alignment and insulation between layers, thereby optimizing the electromagnetic characteristics and resonance matching performance of the wireless charging coil.

[0042] It can be understood that the first wireless charging wire layer 1 and the second wireless charging wire layer 2 can both be designed in a circular ring structure. Of course, the present application is not limited to this. The first wireless charging wire layer 1 and the second wireless charging wire layer 2 can also be customized according to the space requirements of specific smart terminals. For example, the first wireless charging wire layer 1 and the second wireless charging wire layer 2 can also both be in a rectangular ring structure or other irregular structures, etc.

[0043] Continue to refer to Figure 1 and Figure 2 , for the double-layer wireless charging coil with an even number of turns in the present application, both the first sub-wire turn 11 and the second sub-wire turn 12 are single-wire turn coils. Among them, the first leading end 11a of the first sub-wire turn 11 is connected to the second leading end 12a of the second sub-wire turn 12. After the first trailing end 11b of the first sub-wire turn 11 is spirally arranged to the first working number of turns, it is connected to the second wireless charging wire layer 2. After the second trailing end 12b of the second sub-wire turn 12 is spirally arranged to the first working number of turns, it continues to be spirally arranged along the inner circle of the first wireless charging wire layer 1, and after spirally arranging 1 turn, it is connected to the second wireless charging wire layer 2, that is, the second working number of turns can be 1 turn.

[0044] Then, based on the structural design that after the second sub-wire turn 12 is spirally arranged to the first working number of turns, it continues to be spirally arranged along the inner circle of the first wireless charging wire layer 1, and after spirally arranging 1 turn, it is connected to the second wireless charging wire layer 2, the internal space of the coil can be effectively utilized, and while optimizing the winding area, the wireless charging efficiency is improved. Based on Figure 1 and Figure 2 shown double-layer wireless charging coil with an even number of turns, its coil inner diameter is 19.8 mm, the coil outer diameter is 27.2 mm, and the coil area is about 273.2 mm 2 , and the inductance value is 3.2 uH. Then, compared with the conventional wireless charging coil in the related art, the double-layer wireless charging coil with an even number of turns in the present application optimizes its winding area while ensuring the performance of the wireless charging coil, saving the internal space of the smart terminal.

[0045] Continue to refer to Figure 3 and Figure 4 , for the double-layer wireless charging coil with an even number of turns in the present application, both the first sub-wire turn 11 and the second sub-wire turn 12 are single-wire turn coils. Among them, the first leading end 11a of the first sub-wire turn 11 is connected to the second leading end 12a of the second sub-wire turn 12. After the first trailing end 11b of the first sub-wire turn 11 is spirally arranged to the first working number of turns, it is connected to the second wireless charging wire layer 2. After the second trailing end 12b of the second sub-wire turn 12 is spirally arranged to the first working number of turns, it continues to be spirally arranged along the inner circle of the first wireless charging wire layer 1, and after spirally arranging 0.5 turn, it is connected to the second wireless charging wire layer 2, that is, the second working number of turns can be 0.5 turn.

[0046] Based on Figure 3 and Figure 4 the double - layer wireless charging coil with an even number of turns as shown, affected by the continued spiral arrangement of 0.5 turns of the second sub - turn 12, the inner diameter of the coil is divided into two sections. The inner diameter of the upper half of the coil is 19.8 mm, the inner diameter of the lower half of the coil is 20.6 mm, the outer diameter of the coil is 27.2 mm, and the coil area is about 285.4 mm 2 . The inductance value is 3.2 uH. Then, compared with the conventional wireless charging coil in the related art, the double - layer wireless charging coil with an even number of turns of the present application can be applied to an irregular annular area. While ensuring the performance of the wireless charging coil, its winding area is optimized, saving the internal space of the smart terminal.

[0047] It should be noted that the number of turns of the second working circle is not limited to 0.5 turns or 1 turn. That is, the double - layer wireless charging coil with an even number of turns can select the specific number of turns of the second working circle according to the internal space layout of the specific smart terminal. For example, it can also be 0.75 turns, 1.5 turns, 1.75 turns, 2 turns, etc.

[0048] Continue to refer to Figure 5 and Figure 6 . For the double - layer wireless charging coil with an even number of turns of the present application, the first sub - turn 11 and the second sub - turn 12 can also be double - turn coils to meet the requirement of the smart terminal to enhance the magnetic flux coupling by increasing the number of windings. Of course, the number of turns of the first sub - turn 11 and the second sub - turn 12 of the present application is not limited to this, and it can also be customized according to the performance requirements of the specific smart terminal.

[0049] In the specific implementation process, from the outer circle to the inner circle direction of the first wireless charging wire layer 1, the first sub - turn 11 and the second sub - turn 12 are alternately arranged. And at the first tail end 11b of the second sub - turn 12 close to the first sub - turn 11, there is a bending part 121. The bending part 121 bends towards the first tail end 11b of the first sub - turn 11 from the inner circle to the outer circle direction of the first wireless charging wire layer 1, so as to further utilize the space after the first tail end 11b of the first sub - turn 11. Thus, through the bending part 121, the subsequent space of the first tail end 11b of the first sub - turn 11 is better utilized, making the overall coil structure more compact and orderly, avoiding the redundant space of the ordinary coil, and also helping to optimize the electromagnetic field distribution inside the coil and improve the energy transmission efficiency of the wireless charging coil.

[0050] Combined with the above - mentioned double - layer wireless charging coil with an even number of turns, the first wireless charging wire layer 1 and the second wireless charging wire layer 2 are arranged in series connection.

[0051] Continue to refer to Figure 7 andFigure 8 For the double - layer wireless charging coil with an even number of turns in this application, the first wireless charging wire layer 1 and the second wireless charging wire layer 2 are connected in parallel.

[0052] In the specific implementation process, the first wireless charging wire layer 1 and the second wireless charging wire layer 2 are horizontally attached correspondingly. The first wireless charging wire layer 1 includes a first sub - turn 11 and a second sub - turn 12. The first sub - turn 11 and the second sub - turn 12 are spirally arranged in parallel with a gap to the first number of working turns. The first head end 11a of the first sub - turn 11 is connected to the second head end 12a of the second sub - turn 12. After the first sub - turn 11 is spirally arranged to the first number of working turns, the first tail end 11b of the first sub - turn 11 is connected to the second wireless charging wire layer 2. After the second sub - turn 12 is spirally arranged to the first number of working turns, the second tail end 12b of the second sub - turn 12 continues to be spirally arranged along the inner circle of the first wireless charging wire layer 1, and after being spirally arranged to the second number of working turns, it is connected to the second wireless charging wire layer 2. And the second wireless charging wire layer 2 includes alternately arranged third sub - turns 23 and fourth sub - turns 24 with breaks. Both ends of the third sub - turn 23 are respectively connected to the first sub - turn 11, and both ends of the fourth sub - turn 24 are respectively connected to the second sub - turn 12. Thus, while ensuring the performance of the wireless charging coil, its winding area is optimized, and the internal space of the intelligent terminal is saved.

[0053] The above has introduced this application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the core idea of this application; at the same time, for those skilled in the art, according to the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A double-layer wireless charging coil with an even number of turns for wirelessly charging a smart terminal during application, characterized in that, Comprising: A first wireless charging wire layer and a second wireless charging wire layer, the first wireless charging wire layer and the second wireless charging wire layer being horizontally attached correspondingly; The first wireless charging wire layer includes a first sub-wire turn and a second sub-wire turn, the first sub-wire turn and the second sub-wire turn being arranged in parallel and spirally arranged with a gap to a first number of working turns to construct a ring structure of the first wireless charging wire layer; And, a first leading end of the first sub-wire turn is connected to a second leading end of the second sub-wire turn, a first trailing end of the first sub-wire turn is connected to the second wireless charging wire layer after the first sub-wire turn is spirally arranged to the first number of working turns, a second trailing end of the second sub-wire turn continues to be spirally arranged along the inner circle of the first wireless charging wire layer after the second sub-wire turn is spirally arranged to the first number of working turns, and is connected to the second wireless charging wire layer after being spirally arranged to a second number of working turns.

2. The double-layer wireless charging coil with an even number of turns as described in claim 1, wherein The structures of the first wireless charging wire layer and the second wireless charging wire layer are the same and are mirror images of each other.

3. The double-layer wireless charging coil with an even number of turns as described in claim 1, wherein The second number of working turns includes 0.5 turn or 1 turn.

4. The double-layer wireless charging coil with an even number of turns as described in claim 1, wherein Both the first sub-wire turn and the second sub-wire turn are single-wire turn coils.

5. The double-layer wireless charging coil with an even number of turns as described in claim 1, characterized in that, Both the first sub-wire turn and the second sub-wire turn are double-wire turn coils.

6. The double-layer wireless charging coil with an even number of turns as described in claim 1, wherein The first wireless charging wire layer further includes a starting portion, the starting portion is integrally connected to the first leading end of the first sub-wire turn and the second leading end of the second sub-wire turn, and a feeding pin extends from one side of the starting portion.

7. The double-layer wireless charging coil with an even number of turns according to claim 1, characterized in that, From the outer circle of the first wireless charging wire layer to the inner circle direction of the first wireless charging wire layer, the first sub-wire turn and the second sub-wire turn are alternately arranged, and a bending portion is provided at the second sub-wire turn and near the first trailing end of the first sub-wire turn, the bending portion is bent towards the first trailing end of the first sub-wire turn from the inner circle of the first wireless charging wire layer to the outer circle direction of the first wireless charging wire layer to further utilize the space after the first trailing end of the first sub-wire turn.

8. The double-layer wireless charging coil with an even number of turns according to claim 1, characterized in that The first wireless charging wire layer is connected in series with the second wireless charging wire layer.

9. The double-layer wireless charging coil with an even number of turns as described in claim 1, wherein The first wireless charging wire layer is connected in parallel with the second wireless charging wire layer, and the second wireless charging wire layer includes alternately arranged third sub-wire turns and fourth sub-wire turns with breaks, two ends of the third sub-wire turn are respectively connected to the first sub-wire turn, and two ends of the fourth sub-wire turn are respectively connected to the second sub-wire turn.

10. The double-layer wireless charging coil with an even number of turns as described in claim 1, characterized in that, The double-layer wireless charging coil with an even number of turns is an FPC wireless charging coil.

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