Wireless electric energy transmission coil, coil assembly and electronic equipment
By dividing different sections in the radio energy transmission coil and adopting different winding methods, the problem of limited space in electronic devices is solved, ensuring the efficiency and power of wireless charging.
Patent Information
- Application Number
- CN202421604110.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-08
AI Technical Summary
In electronic devices, as the requirements for miniaturization and compactness increase, the space for setting up radio energy transmission coils becomes increasingly limited, and the prior art is difficult to effectively solve this problem. At the same time, reducing the coil area will affect charging efficiency.
By dividing the radio energy transmission coil into a first section and a second section sequentially connected in the circumferential direction, and adopting different winding methods in different sections, the first section has a larger width and a smaller thickness, and the second section has a larger thickness and a smaller width, thereby adjusting the shape of the coil to adapt to the spatial shape of the electronic device.
This solution can adapt to the narrow space inside the electronic device while ensuring that the area of the radio energy transmission coil does not decrease, and ensure the charging efficiency and power of wireless charging.
Smart Images
Figure CN222867419U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wireless charging, and in particular to a wireless power transmission coil, a coil component and an electronic device. Background Art
[0002] In recent years, as wireless power transmission technology has gradually matured, more and more electronic products have been equipped with wireless charging functions, which can improve the flexibility of charging. The power transmission coil is an important component in the wireless charging system. Taking the widely used electromagnetic induction wireless charging system as an example, the transmitting coil of the power transmitter is connected to an alternating current of a certain frequency, and a certain current is generated in the receiving coil of the power receiver through electromagnetic induction, thereby transferring energy from the power transmitter to the power receiver.
[0003] As people put forward higher and higher requirements for the miniaturization and compactness of electronic devices, the space available for placing wireless power transmission coils in electronic devices is becoming increasingly limited, which makes it difficult to set up wireless power transmission coils. Utility Model Content
[0004] In view of this, an object of the present invention is to provide a wireless power transmission coil, a coil assembly and an electronic device, which are conducive to fully utilizing the space in the electronic device and ensuring the charging efficiency of wireless charging.
[0005] In a first aspect, an embodiment of the utility model provides a wireless power transmission coil, which is formed by continuously winding a wire along a first winding direction, and has a first section, a first transition zone, a second section, and a second transition zone connected in sequence along a circumferential direction, the first section has a first width from the outer edge to the inner edge, the second section has a second width from the outer edge to the inner edge, the second width is smaller than the first width, the width of the first transition zone gradually decreases from one end close to the first section to one end close to the second section, and the width of the second transition zone gradually increases from one end close to the second section to one end close to the first section.
[0006] Furthermore, in the length direction of the wire, a cross-sectional dimension of the wire perpendicular to the length direction is constant.
[0007] Further, the first section has a first maximum thickness, the second section has a second maximum thickness, and the second maximum thickness is greater than the first maximum thickness.
[0008] Further, the wireless power transmission coil includes a plurality of basic turns and a plurality of cross-layer turns, at least one of the cross-layer turns is connected between two adjacent basic turns along the first winding direction, and the wireless power transmission coil has a base layer and an overlay layer, and the overlay layer is arranged on one side of the base layer along the thickness direction; wherein the basic turns are arranged on the base layer; the cross-layer turns are arranged on the base layer in the first section, and at least on the overlay layer in the second section; the cross-layer turns enter the overlay layer from the base layer along the first winding direction in the first transition zone, and enter the base layer from the overlay layer along the first winding direction in the second transition zone.
[0009] Further, the stacking layer includes at least two sub-stacked layers, each of the sub-stacked layers has a single layer of the conductive wire, and the at least two sub-stacked layers are stacked in sequence on one side of the base layer along the thickness direction. The wireless power transmission coil has at least two continuously arranged cross-layer turns, each of the cross-layer turns is arranged on the same sub-stacked layer in the second section, and two continuously arranged and adjacent cross-layer turns are arranged on two adjacent sub-stacked layers in the second section.
[0010] Further, the base layer has a single layer of the conductive wire; or, the base layer includes at least two sub-base layers, each of which has a single layer of the conductive wire, the at least two sub-base layers have the same shape, the at least two sub-base layers are stacked in sequence along the thickness direction of the wireless power transmission coil, and each of the base turns is arranged in the same sub-base layer.
[0011] Furthermore, the cross-section of the wire perpendicular to the length direction has a long side and a short side, the long side is perpendicular to the short side, the wireless power transmission coil includes at least one torsional turn, the long side of the torsional turn is perpendicular to the axis of the wireless power transmission coil in the first section, and the short side is perpendicular to the axis of the wireless power transmission coil in the second section; the wire of the torsional turn is twisted in the first transition zone and the second transition zone.
[0012] Furthermore, the wireless power transmission coil further includes at least one basic turn, and the long side of the twisted turn is perpendicular to the axis of the wireless power transmission coil.
[0013] Furthermore, the conductive wire is a Litz wire or a self-adhesive wire.
[0014] In a second aspect, an embodiment of the utility model further provides a coil assembly, comprising: a wireless power transmission coil as described in the first aspect, wherein the conducting wire of the wireless power transmission coil has an inner end and an outer end; and a connecting circuit board, which is arranged on one side of the wireless power transmission coil and is electrically connected to the inner end and the outer end respectively.
[0015] Furthermore, the connecting circuit board has a main body, a first connecting arm and a second connecting arm, the first connecting arm extends from the main body to the inner end and is connected to the inner end, and the second connecting arm extends from the main body to the outer end and is connected to the outer end.
[0016] Furthermore, the inner end and the outer end are arranged at the first section, and the first connecting arm and the second connecting arm are arranged at one side of the first section and avoid the second section.
[0017] Furthermore, the connecting circuit board is a rigid printed circuit board, a flexible printed circuit board or a rigid-flexible board.
[0018] In a third aspect, an embodiment of the utility model further provides an electronic device, comprising: a device body, which includes a coil installation space inside; and the coil assembly as described in the second aspect, which is arranged in the coil installation space.
[0019] The embodiment of the utility model provides a wireless power transmission coil, a coil assembly and an electronic device. The continuously wound wireless power transmission coil is divided into a first section and a second section arranged along the circumferential direction. Different winding methods are used in the first section and the second section so that the first section has a first maximum thickness, the second section has a second maximum thickness, the first section has a first width from the outer edge to the inner edge, the second section has a second width from the outer edge to the inner edge, the second maximum thickness is greater than the first maximum thickness and the second width is less than the first width. Therefore, the size of the wireless power transmission coil can be adjusted to adapt to the spatial shape in the electronic device, and it can be ensured that the area of the wireless power transmission coil will not be reduced too much, thereby ensuring the charging efficiency of wireless charging. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The above and other purposes, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
[0021] Figure 1 It is a three-dimensional outline schematic diagram of a wireless power transmission coil according to an embodiment of the utility model;
[0022] Figure 2 It is a top view schematic diagram of a wireless power transmission coil according to an embodiment of the utility model;
[0023] Figure 3 It is a side view schematic diagram of a wireless power transmission coil according to an embodiment of the utility model;
[0024] Figure 4 It is a schematic diagram comparing a wireless power transmission coil of an embodiment of the utility model and a coil of a comparative example;
[0025] Figure 5 This is a schematic diagram of the internal structure of a wireless power transmission coil according to an embodiment of the utility model;
[0026] Figure 6 It is a cross-sectional schematic diagram of a wireless power transmission coil according to an embodiment of the utility model;
[0027] Figure 7 is a cross-sectional schematic diagram of a wireless power transmission coil according to another embodiment of the utility model;
[0028] Figure 8 is a cross-sectional schematic diagram of a wireless power transmission coil according to another embodiment of the utility model;
[0029] Fig. 9 It is a schematic diagram of the winding method of the wireless power transmission coil of one embodiment of the utility model;
[0030] Fig.10 is a cross-sectional schematic diagram of a wireless power transmission coil according to another embodiment of the utility model;
[0031] Fig.11 is a cross-sectional schematic diagram of a wireless power transmission coil according to another embodiment of the utility model;
[0032] Fig.12 is a cross-sectional schematic diagram of a wireless power transmission coil according to another embodiment of the utility model;
[0033] Fig.13 It is a partial schematic diagram of a wire used for winding a wireless power transmission coil according to an embodiment of the utility model;
[0034] Fig.14 It is a structural schematic diagram of a coil assembly of an embodiment of the utility model;
[0035] Fig.15 It is a schematic diagram of the internal structure of an electronic device according to an embodiment of the utility model.
[0036] Description of reference numerals:
[0037] AX-winding axis; SD-length direction of the conductor; CRS-plane perpendicular to the length direction of the conductor; w1-first width; w2-second width; 1-wireless power transmission coil; 10-conductor; 11-first section; 12-second section; 13-first transition zone; 14-second transition zone; 15-basic turn; 16-cross-layer turn; 17-base layer; 171-sub-base layer; 18-overlay layer; 181-sub-overlay layer; 19-twisted turn; 101-inner end; 102-outer end; 2-winding coil; 3-connecting circuit board; 31-main body; 32-first connecting arm; 33-second connecting arm; 4-device body. DETAILED DESCRIPTION
[0038] The present application is described below based on embodiments, but the present application is not limited to these embodiments. In the detailed description of the present application below, some specific details are described in detail. It is possible for those skilled in the art to fully understand the present application without the description of these details. In order to avoid confusing the essence of the present application, known methods, processes, flows, components and circuits are not described in detail.
[0039] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.
[0040] Unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0041] For ease of explanation, spatially relative terms such as "inside," "outside," "below," "beneath," "lower," "above," "upper," and the like are used herein to describe the relationship of one element or feature to another element or feature illustrated in the figures. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein should be interpreted accordingly.
[0042] Unless the context clearly requires otherwise, the words "include", "comprising" and similar words throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".
[0043] In the description of this application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.
[0044] Electronic devices are usually equipped with multiple components. When the space of the wireless charging module is occupied by other components, the existing solution is to reduce the overall outer dimensions of the wireless power transmission coil 1 to adapt to the internal space of the electronic device. For the wireless power transmission coil 1 manufactured by winding, an existing solution is to reduce the outer dimensions of the wireless power transmission coil 1 by reducing the number of turns of the wireless power transmission coil 1, for example, reducing the number of turns of a single-layer planar circular coil from 30 turns to 25 turns, thereby reducing the outer diameter of the coil. However, this method greatly reduces the area of the wireless power transmission coil 1, which will have a significant negative impact on the wireless charging power and charging efficiency.
[0045] The embodiment of the utility model provides a new wireless power transmission coil 1, which can be applied to electronic devices, and is helpful to ensure the transmission efficiency of wireless charging when the internal space of the electronic device is narrow.
[0046] The wireless power transmission coil 1 of the embodiment of the utility model is a multi-turn coil made by winding a wire 10. The wireless power transmission coil 1 is formed by continuously winding the wire 10 along a predetermined first winding direction. For example, the wire 10 can be continuously wound along the first winding direction outside the core to form the wireless power transmission coil 1. The first winding direction can be a clockwise direction around the winding axis AX of the wireless power transmission coil 1, for example, it can be a clockwise direction or a counterclockwise direction. The outer contour shape of the wireless power transmission coil 1 can be basically circular, rectangular, triangular, trapezoidal or other shapes, which can be selected according to the internal space size of the electronic device, the distribution of various components, the type of the power transmitting end, etc.
[0047] The specific type of the wire 10 can be selected according to the actual use needs of the electronic product, for example, it can be a single-strand enameled wire, a multi-strand enameled wire, a Litz wire, a superconducting material wire, etc. In this embodiment, the wire 10 can be a Litz wire, which is formed by twisting or weaving a plurality of independently insulated conductors. The internal structure of the Litz wire can be described as a bundle of thin wires formed by multiple strands of wire. This multi-wire thinning mode limits the skin effect in the magnetic field to a small range of the thin wire itself, thereby achieving the effect of reducing the internal impedance of the wire 10 itself. The use of Litz wire to wind the wireless power transmission coil 1 is conducive to ensuring the efficiency of wireless charging. The wire 10 can be a self-adhesive wire, which can be conveniently fixed and shaped between the turns of the wound coil during the winding process.
[0048] Reference Figures 1 to 3 and Figure 5The wireless power transmission coil 1 has a first section 11, a first transition zone 13, a second section 12, and a second transition zone 14 arranged in sequence along the circumferential direction. The first section 11, the first transition zone 13, the second section 12, and the second transition zone 14 are connected in sequence along the circumferential direction of the wireless power transmission coil 1 to form a complete full circle structure. Each turn of the wire 10 during winding will pass through the first section 11, the first transition zone 13, the second section 12, and the second transition zone 14. In the embodiment of the utility model, the middle part of the wireless power transmission coil 1 has a hollow, the first section 11 has a first width w1 from the outer edge to the inner edge of the wireless power transmission coil 1, and the second section 12 has a second width w2 from the outer edge to the inner edge of the wireless power transmission coil 1, and the second width w2 is smaller than the first width w1. The width of the first transition zone 13 gradually decreases from one end close to the first section 11 to one end close to the second section 12, and the width of the second transition zone 14 gradually increases from one end close to the second section 12 to one end close to the first section 11. Therefore, the first section 11 and the second section 12 of the wireless power transmission coil 1 have different cross-sectional shapes, which can fully adapt to the narrow space in the electronic device, avoid other components in the electronic device in a targeted manner, and ensure the area of the wireless power transmission coil 1, thereby ensuring the charging power and charging efficiency of wireless charging.
[0049] The first section 11 has a first maximum thickness, and the second section 12 has a second maximum thickness. In some embodiments, the second maximum thickness is greater than the first maximum thickness. Optionally, the conductor 10 is a wire with uniform thickness. In the embodiment of the utility model, the conductor 10 is stacked in the first section 11 with a smaller thickness and a larger first width w1 during the winding process, so that the shape of the first section 11 is relatively flat; the conductor 10 is stacked in the second section 12 with a relatively larger thickness, so that the second width w2 of the second section 12 is relatively small.
[0050] Reference Figure 4 , Figure 4 The top view of the wireless power transmission coil 1 according to the embodiment of the utility model is shown above. Figure 4 Below is a top view of a comparative winding coil 2. The comparative winding coil 2 and the wireless power transmission coil 1 using the technical solution of the present invention have the same width L1 in the left-right direction in the figure, so as to adapt to the narrower space in the corresponding electronic device along the left-right direction in the figure relative to the up-down direction, and the wireless charging coil of the present invention embodiment in the upper figure and the comparative winding coil 2 in the lower figure have the same shape in the middle. Figure 4 It can be seen that the wireless power transmission coil 1 of the embodiment of the utility model in the upper part of the figure has a larger area than the winding coil 2 of the comparative example in the lower part of the figure, thereby ensuring the charging power of wireless charging.
[0051] Figure 5 The schematic diagram shows the positions of the coil turns of the wireless power transmission coil 1 in the first section 11 and the second section 12 of the embodiment of the utility model. Figure 6-Figure 8 , Figure 10-12 shows a cross section of a wireless power transmission coil 1 of different embodiments, and Figure 6-Figure 8 , Figure 10-12 The cross-sectional position of the wireless power transmission coil 1 of the embodiment of the utility model is a plane passing through the first section 11, the second section 12 and the winding axis AX of the wireless power transmission coil 1. In one embodiment, referring to Figure 5 and Figure 6 , the wireless power transmission coil 1 has a base layer 17 and an overlay layer 18, and the overlay layer 18 is arranged on one side of the base layer 17 along the thickness direction, that is, the base layer 17 and the overlay layer 18 correspond to different height positions of the wireless power transmission coil 1. The wireless power transmission coil 1 includes a plurality of base turns 15 and a plurality of cross-layer turns 16, and the base turns 15 and the cross-layer turns 16 are alternately arranged in a certain manner. Among the plurality of base turns 15 of the wireless power transmission coil 1, one or more cross-layer turns 16 are arranged between at least two base turns 15 adjacent to each other along the first winding direction. The base turns 15 are wound only in the base layer 17, while the cross-layer turns 16 are wound through both the base layer 17 and the overlay layer 18, that is, different areas of the cross-layer turns 16 are located at different height positions of the wireless power coil. Among them, the cross-layer turns 16 are arranged in the base layer 17 in the first section 11, and in the overlay layer 18 in the second section 12, that is, the cross-layer turns 16 are located at different height positions in the first section 11 and the second section 12, respectively. By providing the cross-layer turns 16 and winding the cross-layer turns 16 in the superimposed layer 18 in the second section 12, the cross-layer turns 16 can be stacked in the second section 12 in a manner of increasing the height (or thickness) of the wireless power transmission coil 1, so that the wound wireless power transmission coil 1 has a smaller width in the first section 11 than in the second section 12 and a larger thickness to adapt to the space in the electronic device.
[0052] At each location along the length direction SD of the conductive wire 10 , the cross-sectional dimension of the conductive wire 10 perpendicular to the length direction SD is substantially constant. Fig.13 A schematic diagram of a section of wire 10 is shown, referring to Fig.13 , the length direction SD of the wire 10 refers to the extension direction of the wire 10, Fig.13 FIG. 1 shows a plane CRS perpendicular to the length direction SD of the conductor 10. Fig.13In the figure, the cross section of the wire 10 perpendicular to the length direction SD is perpendicular to the drawing. When the wire 10 is wound to form the wireless power transmission coil 1, the length direction SD of the wire 10 is parallel to the first winding direction. In other words, the wire 10 is a wire 10 with substantially uniform thickness and shape. For example, the wire 10 may be a Litz wire with substantially constant outer diameter at each location along the length direction SD. For another example, Figure 6-Figure 8 , Figure 10-12 The cross-sectional shape of the conductor 10 at the first section 11 and the second section 12 perpendicular to the length direction SD of the conductor 10 is shown in FIG. Figure 6-Figure 8 as well as Fig.10 The cross-sectional shapes of the conductor 10 at the first section 11 and the second section 12, as well as other regions of the wireless power transmission coil 1, are substantially the same as circles; Figure 11-Figure 12 , the cross-sectional shapes of the wire 10 at the first section 11 and the second section 12 and at other areas of the wireless power transmission coil 1 are substantially equal rectangles. Therefore, by adjusting the stacking mode of each turn in different areas of the wireless power transmission coil 1 when the wire 10 is wound, the shape of the wireless power transmission coil 1 in the first section 11 and the second section 12 can be adjusted more conveniently and accurately, so that the wound wireless power transmission coil 1 can fully match the shape of the space where it is to be installed.
[0053] Reference Figure 6-Figure 10 The basic turn 15 is located in the base layer 17 in the first section 11, the first transition zone 13, the second section 12 and the second transition zone 14; the cross-layer turn 16 enters the superimposed layer 18 from the base layer 17 along the first winding direction in the first transition zone 13, and enters the base layer 17 from the superimposed layer 18 along the first winding direction in the second transition zone 14.
[0054] The base layer 17 has a substantially uniform thickness. The base layer 17 may include a single layer or multiple layers of wires 10, which may be selected based on the thickness of the wires 10, the size of the internal space of the electronic device, and the requirements for wireless power transmission performance. Figure 6 and Figure 8 , the base layer 17 includes a single-layer conductor 10, so that the first section 11 has a smaller first maximum thickness, which can adapt to a smaller installation space in an electronic device. Figure 7 The base layer 17 includes at least two sub-base layers 171 stacked in sequence along the thickness direction of the wireless power transmission coil 1, each sub-base layer 171 has a single-layer wire 10, and each base turn 15 is wound in the same sub-base layer 171. The shapes of the sub-base layers 171 can be basically the same, for example, the multiple sub-base layers 171 are annular in shape with the same size.
[0055] In some embodiments, reference Figure 6and Figure 8 , the superimposed layer 18 includes a single layer of wire 10, and the base layer 17 includes a single layer of wire 10, then the wireless power transmission coil 1 has a single layer of wire 10 in the first section 11, and has two layers of wire 10 in the second section 12. The second width w2 can be adjusted by adjusting the ratio between the cross-layer turns 16 and the base turns 15, for example, compared Figure 6 and Figure 8 , when the total number of windings of the wireless power transmission coil 1 is constant and the cross-sectional size of the wire 10 is the same as the hollow size of the middle part of the wireless power transmission coil 1, Figure 6 The number of cross-layer turns 16 in the Figure 8 The number of cross-layer turns in 16, then Figure 6 The second width w2 of the second section 12 of the wireless power transmission coil 1 is less than Figure 8 The second width w2 of the second section 12 in Figure 6 and Figure 8 When the wireless power transmission coil 1 is wound in a manner that a basic turn 15 and a cross-layer turn 16 are alternately arranged, the second width w2 of the second section 12 has a smaller value.
[0056] Fig. 9 Schematic diagram of the winding of the wireless power transmission coil 1 of the embodiment of the utility model. Fig. 9 Taking the winding of the conductor 10 in the counterclockwise direction in the figure as an example, there is a cross-layer turn 16 between two basic turns 15. After the first basic turn 15 is wound from the first section 11 to the second section 12 in the basic layer 17 (as shown in FIG. Fig. 9 ), continue to refer to Fig. 9 , the conductor 10 is wound around the base layer 17 of the first section 11 to start winding the cross-layer turn 16 (indicated by a dotted outline in the figure). When the cross-layer turn 16 is wound around the second section 12, the wire is wound around the superimposed layer 18 to overlap on one side of the base turn 15 of the base layer 17 (the side facing outside the drawing in the figure); refer to Fig. 9 The wire 10 is then wound around the base layer 17 and is wound in the first section 11 and the second section 12 in a counterclockwise direction to form a second base turn 15 (indicated by a double-dotted line in the figure). The second base turn 15 is located outside the cross-layer turn 16 in the first section 11 and outside the first base turn 15 in the second section 12. Thus, a wireless power transmission coil 1 having different widths and thicknesses in the first section 11 and the second section 12 can be formed.
[0057] In some embodiments, reference Fig.10The stacking layer 18 includes at least two sub-stacked layers 181, each of which has a single-layer wire 10. The at least two sub-stacked layers 181 are stacked in sequence on one side of the base layer 17 along the thickness direction, and each cross-layer turn 16 is provided on the same sub-stacked layer 181 in the second section 12. The wireless power transmission coil 1 has at least two continuously arranged cross-layer turns 16, and two continuously arranged and adjacent cross-layer turns 16 are provided on two adjacent sub-stacked layers 181 in the second section 12. For example, referring to Fig.10 The stacking layer 18 includes two sub-stacked layers 181, namely a first sub-stacked layer 181 and a second sub-stacked layer 181. The first sub-stacked layer 181 is attached to one side of the base layer 17, and the second sub-stacked layer 181 is arranged on one side of the first sub-stacked layer 181 away from the base layer 17. Fig.10 The cross-layer turns 16 of the wireless power transmission coil 1 are divided into two types: the first cross-layer turn 16 and the second cross-layer turn 16, wherein the first cross-layer turn 16 is wound on the first sub-stacked layer 181 in the second section 12, and the second cross-layer turn 16 is wound on the second sub-stacked layer 181 in the second section 12. In addition, the first cross-layer turn 16 is provided between the second cross-layer turn 16 and the previous basic turn 15, that is, the second cross-layer turn 16 is provided on the outside of the first cross-layer turn 16 (on the side away from the winding axis AX of the wireless power transmission coil 1) at the first section 11, and is superimposed on the first cross-layer turn 16 at the second section 12.
[0058] In other embodiments, the cross section of the wire 10 perpendicular to the length direction SD has a long side and a short side, and the long side is perpendicular to the short side. For example, the cross section of the wire 10 perpendicular to the length direction SD can be approximately rectangular (eg Fig.11 and 12 As shown), elliptical, etc. The wireless power transmission coil 1 includes at least one torsion turn 19, and the wire 10 of the torsion turn 19 is twisted in the first transition zone 13 and the second transition zone 14, so as to adjust the position of the long side and the short side relative to the axis of the wireless power transmission coil 1 when the wire 10 is wound, so that the long side of the torsion turn 19 is perpendicular to the axis of the wireless power transmission coil 1 in the first section 11, and the short side is perpendicular to the axis of the wireless power transmission coil 1 in the second section 12. Thus, the width of the first section 11 is smaller than the width of the second section 12. In one implementation, as Fig.11 As shown, the wireless power transmission coil 1 is composed of a plurality of twisted turns 19, and the width of the first section 11 is the sum of the dimensions of the plurality of short sides. Fig.12 As shown, the wireless power transmission coil 1 also includes at least one basic turn 15, and the long side of the torsion turn 19 is perpendicular to the axis of the wireless power transmission coil 1. By reasonably configuring the ratio of the number of basic turns 15 to the torsion turn 19, the ratio between the first width w1 and the second width w2 can be adjusted.
[0059] Taking the approximately circular wireless power transmission coil 1 as an example, the following Table 1 is a comparison table of the size and charging efficiency of the wireless power transmission coil 1 of the embodiment of the utility model under different ratios between the first width w1 and the second width w2:
[0060] Table 1
[0061]
[0062] The Y-direction dimension in Table 1 refers to the shortest dimension in the direction perpendicular to the axis of the wireless power transmission coil 1, for example Figure 2 The size from the leftmost end to the rightmost end of the wireless power transmission coil 1 in FIG. As can be seen from the above table, compared with a circular coil with uniform width (the ratio of the first width w1 to the second width w2 is 1:1), the wireless power transmission coil 1 using the technical solution of the embodiment of the utility model can better achieve the size reduction in the Y direction to adapt to the space in the electronic device, and ensure that the reduction range of the overall area of the wireless power transmission coil 1 is small, thereby ensuring the charging efficiency of wireless charging.
[0063] The embodiment of the utility model further provides a coil assembly, which is suitable for use in a wireless charging system and can be used as a part of a wireless power transmitting circuit of a power transmitting end, or as a part of a wireless power receiving circuit of a power receiving end. Fig.14 is a schematic diagram of a coil assembly according to an embodiment of the present utility model, referring to Fig.14 The coil assembly includes a connecting circuit board 3 and the wireless power transmission coil 1 in at least some of the above embodiments. The connecting circuit board 3 is provided with a connecting circuit for electrically connecting the wireless power transmission coil 1 with other devices. For example, for the power receiving end, the wireless power transmission coil 1 can be electrically connected to the rechargeable battery through the connecting circuit on the connecting circuit board 3, so as to transmit the received power to the rechargeable battery. The coil assembly of the embodiment of the utility model can fully adapt to the narrow space inside the electronic device or the irregular space formed by being squeezed by other components by adopting the wireless power transmission coil 1 in at least some of the above embodiments, and the wireless power transmission coil 1 has a large area, which can ensure the efficiency and power of wireless charging.
[0064] The connection circuit board 3 can be a hard printed circuit board, a flexible printed circuit board (FPC) or a hard-soft board. The shape and location of the connection circuit board 3 can be determined according to the internal space of the electronic device and the locations of other components. When the space inside the electronic device is small, the connection circuit board 3 can be a flexible printed circuit board, which has a small thickness and is easy to bend according to the shape of the internal space of the electronic device.
[0065] In one embodiment, the connection circuit board 3 has a main body 31, a first connection arm 32 and a second connection arm 33, the first connection arm 32 and the second connection arm 33 extend outward from the main body 31 respectively, the first connection arm 32 extends to the inner end 101 and is connected to the inner end 101, and the second connection arm 33 extends to the outer end 102 and is connected to the outer end 102. This arrangement can facilitate the connection of the connection circuit on the connection circuit board 3 with the inner end 101 and the outer end 102, and there is no need to lead both ends of the wire 10 to the outside of the wireless power transmission coil 1, which is convenient for manufacturing and conducive to compact design. The first connection arm 32 and the second connection arm 33 can be set to a certain angle as needed to fully adapt to the shape of the wireless power transmission coil 1 and the internal space layout of the electronic device.
[0066] In one embodiment, the inner end 101 and the outer end 102 are disposed on the first section 11, and the first connecting arm 32 and the second connecting arm 33 are disposed on a side surface of the first section 11 and avoid the second section 12. Since the thickness of the first section 11 is relatively thin, the first connecting arm 32 and the second connecting arm 33 can be disposed at a position corresponding to the first section 11 to make full use of the height space.
[0067] The present utility model also provides an electronic device, which may be a mobile phone, a tablet computer, a smart watch, a vehicle terminal, or other electronic device that needs to be equipped with a wireless charging function. Fig.15 The electronic device of the embodiment of the utility model includes a device body 4 and the coil assembly in at least some of the above embodiments. The device body 4 includes a coil installation space inside, and the coil assembly is arranged in the installation space. By adopting the coil assembly in at least some of the above embodiments, the coil installation space can be fully utilized, and the area of the wireless power transmission coil 1 can be guaranteed when the coil installation space is relatively small or occupied by other components, thereby ensuring the charging efficiency of wireless charging.
[0068] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A wireless power transmission coil, characterized in that: The wireless power transmission coil (1) is formed by continuously winding a wire (10) along a first winding direction. The wireless power transmission coil (1) comprises a first section (11), a first transition zone (13), a second section (12) and a second transition zone (14) which are sequentially connected along a circumferential direction. The first section (11) has a first width (w1) from an outer edge to an inner edge. The second section (12) has a second width (w2) from an outer edge to an inner edge. The second width (w2) is smaller than the first width (w1). The width of the first transition zone (13) gradually decreases from an end close to the first section (11) to an end close to the second section (12). The width of the second transition zone (14) gradually increases from an end close to the second section (12) to an end close to the first section (11).
2. The wireless power transmission coil according to claim 1, characterized in that: In the length direction (SD) of the wire (10), the cross-sectional dimensions of the wire (10) perpendicular to the length direction (SD) are constant.
3. The wireless power transmission coil according to claim 1, characterized in that: The first section (11) has a first maximum thickness, and the second section (12) has a second maximum thickness, wherein the second maximum thickness is greater than the first maximum thickness.
4. The wireless power transmission coil according to claim 1, characterized in that: The wireless power transmission coil (1) comprises a plurality of basic turns (15) and a plurality of cross-layer turns (16), at least one of the cross-layer turns (16) is connected between two adjacent basic turns (15) along the first winding direction, and the wireless power transmission coil (1) has a basic layer (17) and a superimposed layer (18), wherein the superimposed layer (18) is arranged on one side of the basic layer (17) along the thickness direction; Wherein, the basic turn (15) is arranged on the basic layer (17); The cross-layer turn (16) is provided on the base layer (17) in the first section (11), and is provided at least on the superimposed layer (18) in the second section (12); The cross-layer turn (16) enters the superimposed layer (18) from the base layer (17) along the first winding direction in a first transition zone (13), and enters the base layer (17) from the superimposed layer (18) along the first winding direction in a second transition zone (14).
5. The wireless power transmission coil according to claim 4, characterized in that: The stacking layer (18) comprises at least two sub-stacked layers (181), each of the sub-stacked layers (181) having a single layer of the conductive wire (10), the at least two sub-stacked layers (181) being stacked in sequence on one side of the base layer (17) along the thickness direction, the wireless power transmission coil (1) having at least two continuously arranged cross-layer turns (16), each of the cross-layer turns (16) being arranged on the same sub-stacked layer (181) in the second section (12), and two continuously arranged and adjacent cross-layer turns (16) being arranged on two adjacent sub-stacked layers (181) in the second section (12).
6. The wireless power transmission coil according to claim 4, characterized in that: The base layer (17) has a single layer of the conductive wire (10); or The base layer (17) comprises at least two sub-base layers (171), each of the sub-base layers (171) having a single layer of the conductive wire (10), the at least two sub-base layers (171) having the same shape, the at least two sub-base layers (171) being stacked in sequence along the thickness direction of the wireless power transmission coil (1), and each of the base turns (15) being arranged on the same sub-base layer (171).
7. The wireless power transmission coil according to claim 1, characterized in that: The cross section of the wire (10) perpendicular to the length direction (SD) has a long side and a short side, the long side is perpendicular to the short side, the wireless power transmission coil (1) comprises at least one torsion turn (19), the long side of the torsion turn (19) is perpendicular to the axis of the wireless power transmission coil (1) at the first section (11), and the short side is perpendicular to the axis of the wireless power transmission coil (1) at the second section (12); The conductor (10) of the twisted turn (19) is twisted in the first transition region (13) and the second transition region (14).
8. The wireless power transmission coil according to claim 7, characterized in that: The wireless power transmission coil (1) further comprises at least one basic turn (15), and the long side of the twisted turn (19) is perpendicular to the axis of the wireless power transmission coil (1).
9. The wireless power transmission coil according to claim 1, characterized in that: The conductor (10) is a Litz wire or a self-adhesive wire.
10. A coil assembly, characterized in that: include: The wireless power transmission coil (1) according to any one of claims 1 to 9, wherein the wire (10) of the wireless power transmission coil (1) has an inner end (101) and an outer end (102); as well as A connecting circuit board (3) is arranged on one side of the wireless power transmission coil (1) and is electrically connected to the inner end (101) and the outer end (102) respectively.
11. The coil assembly according to claim 10, characterized in that: The connecting circuit board (3) comprises a main body (31), a first connecting arm (32) and a second connecting arm (33); the first connecting arm (32) extends from the main body (31) to the inner end (101) and is connected to the inner end (101); the second connecting arm (33) extends from the main body (31) to the outer end (102) and is connected to the outer end (102).
12. The coil assembly according to claim 11, characterized in that: The inner end (101) and the outer end (102) are arranged on the first section (11), and the first connecting arm (32) and the second connecting arm (33) are arranged on one side of the first section (11) and avoid the second section (12).
13. The coil assembly according to claim 10, characterized in that: The connecting circuit board (3) is a hard printed circuit board, a flexible printed circuit board or a hard-flex combined board.
14. An electronic device, characterized in that: include: The device body (4) includes a coil installation space inside; as well as The coil assembly according to any one of claims 10 to 13 is arranged in the coil installation space.