Near field communication antenna, wireless charging device, wireless charging system and vehicle

Abstract

The embodiment of the utility model provides a near field communication antenna, wireless charging equipment, a wireless charging system and a vehicle, the near field communication antenna comprises a first coil part and a second coil part, and the first coil part is arranged in the circumferential direction of the second coil part and is connected with the second coil part; the ratio of the external size of the first coil part to the external size of the second coil part is 2-2.5, and the ratio of the internal size of the first coil part to the external size of the second coil part is 1.5-2. By controlling the size proportion of the first coil part and the second coil part, the overall magnetic field distribution of the near field communication antenna can be uniform, and the magnetic field intensity is large, so that the existence of a card can be effectively identified.

Description

Technical Field

[0001] This application belongs to the technical field of vehicles, and particularly relates to a near-field communication antenna, a wireless charging device, a wireless charging system, and a vehicle. Background Art

[0002] A near-field communication antenna (NFC antenna for short) is a short-range wireless communication technology. Due to the characteristics of short transmission distance, fast transmission speed, and high security of the near-field communication antenna, it has been widely used in fields such as identity authentication, access control systems, and ticketing systems.

[0003] In related technologies, a near-field communication antenna usually includes multiple coils, and the identification of a card is achieved through electromagnetic induction between the coils and the card (such as an ID card, access control card, bus card, etc.). However, when the coils are not arranged properly, problems such as uneven magnetic field distribution and / or insufficient magnetic field strength may occur in the near-field communication antenna, thereby affecting the effective identification of the card. Summary of the Utility Model

[0004] This application aims to provide a near-field communication antenna, a wireless charging device, a wireless charging system, and a vehicle to solve the problem that existing wireless charging devices are difficult to effectively identify cards.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, this application discloses a near-field communication antenna, including: a first coil part and a second coil part, the first coil part is arranged circumferentially on the second coil part and is connected to the second coil part;

[0007] The ratio of the external dimension of the first coil part to the external dimension of the second coil part is 2 to 2.5, and the ratio of the internal dimension of the first coil part to the external dimension of the second coil part is 1.5 to 2.

[0008] Optionally, the ratio of the external dimension of the first coil part to the internal dimension of the second coil part is 2.2 to 2.8, and the ratio of the internal dimension of the first coil part to the internal dimension of the second coil part is 1.8 to 2.2.

[0009] Optionally, the number of coils of the first coil part is greater than the number of coils of the second coil part.

[0010] Optionally, the number of coils of the first coil part is A, and the number of coils of the second coil part is B, satisfying: A:B = (2 to 4):1, and both A and B are positive integers.

[0011] Optionally, the number of turns of the first coil part satisfies: 2 turns ≤ A ≤ 6 turns.

[0012] Optionally, the number of turns of the second coil part satisfies: 1 turn ≤ B ≤ 3 turns.

[0013] Optionally, the first coil part includes: at least one first coil, and the first coil is rectangular;

[0014] Wherein, the length of the outermost first coil is L1, and the width of the outermost first coil is W1, satisfying: W1:L1 = 1:(1 to 3).

[0015] Optionally, the length of the outermost first coil satisfies: 80 mm ≤ L1 ≤ 150 mm, and the width of the outermost first coil satisfies: 40 mm ≤ W1 ≤ 100 mm.

[0016] Optionally, the second coil part includes: at least one second coil, and the second coil is rectangular;

[0017] Wherein, the length of the outermost second coil is L2, and the width of the outermost second coil is W2, satisfying: W2:L2 = 1:(2 to 4).

[0018] Optionally, the length of the outermost second coil satisfies: 63 mm ≤ L2 ≤ 133 mm, and the width of the outermost second coil satisfies: 10 mm ≤ W2 ≤ 30 mm.

[0019] Optionally, the distance between two adjacent coils in the first coil part, and / or the distance between two adjacent coils in the second coil part, and / or the distance between two adjacent coils of the first coil part and the second coil part is W3, satisfying 0.3 mm ≤ W3 ≤ 3 mm.

[0020] Optionally, the width of the coil is 0.3 mm to 2 mm.

[0021] Optionally, the near-field communication antenna further includes: a substrate, and the first coil part and the second coil part are disposed on the surface of the substrate.

[0022] Optionally, the thickness of the substrate is 0.5 mm to 1 mm.

[0023] Optionally, the near-field communication antenna further includes a cross-connection part, and the cross-connection part is used to connect two adjacent coils in the first coil part, and / or two adjacent coils in the second coil part, and / or two adjacent coils of the first coil part and the second coil part.

[0024] Optionally, the substrate includes a first surface and a second surface disposed away from each other in the thickness direction;

[0025] The cross-connection portion includes a first connection line and a second connection line that are cross-disposed in the thickness direction of the substrate, and the first connection line is disposed on the first surface, and the second connection line is disposed on the second surface to connect two adjacent coils in the first coil portion, and / or two adjacent coils in the second coil portion, and / or two adjacent coils of the first coil portion and the second coil portion.

[0026] Optionally, the first coil portion, and / or the second coil portion, and / or the cross-connection portion is a symmetric structure.

[0027] In a second aspect, the present application also discloses a wireless charging device, including: a wireless charging coil and the near-field communication antenna according to any one of the above, and the near-field communication antenna is disposed at an interval from the wireless charging line.

[0028] Optionally, the distance between the near-field communication antenna and the wireless charging coil is 1.3 mm to 1.5 mm.

[0029] Optionally, the near-field communication antenna at least covers the wireless charging coil.

[0030] Optionally, the wireless charging device further includes: a power supply module;

[0031] The first coil portion includes at least one first coil, and the outermost first coil is connected to the power supply module.

[0032] Optionally, the wireless charging device further includes: a metal housing, and at least part of the near-field communication antenna and the wireless charging coil are disposed in the metal housing.

[0033] Optionally, the metal housing is provided with an installation cavity having an opening;

[0034] The near-field communication antenna and the wireless charging coil are disposed in the installation cavity, and the near-field communication antenna is disposed close to the opening of the installation cavity.

[0035] Optionally, the wireless charging device further includes a cover plate, and the cover plate covers the opening.

[0036] Second aspect, the present application also discloses a wireless charging system, including: a controller and the wireless charging device described in any one of the above, the controller is respectively connected to the near-field communication antenna and the wireless charging coil, the near-field communication antenna is used to obtain the identification signal of the target object, the wireless charging coil is used to charge the device to be charged, and the controller is used to control the opening and closing of the wireless charging coil based on the identification signal and send out an alarm message.

[0037] Optionally, when the target object is placed on the wireless charging device before the device to be charged, or when the target object and the device to be charged are placed on the wireless charging device at the same time, the controller can control the wireless charging coil to remain closed and send out an alarm message.

[0038] Optionally, when the device to be charged is placed on the wireless charging device before the target object, the controller can control the wireless charging coil to close and send out an alarm message.

[0039] Fourth aspect, the present application also discloses a vehicle, which includes the above wireless charging system.

[0040] In the embodiments of the present application, by setting the first coil part and the second coil part located inside the first coil part, and the ratio of the outer dimension of the first coil part to the outer dimension of the second coil part is 2 to 2.5, and the ratio of the inner dimension of the first coil part to the outer dimension of the second coil part is 1.5 to 2. In this way, the first coil part located outside can enhance the magnetic field intensity in the edge area of the near-field communication antenna and eliminate the interference of the external environment, and the second coil part located inside can enhance the magnetic field intensity in the central area of the near-field communication antenna. More importantly, by controlling the size ratio of the first coil part and the second coil part, the overall magnetic field distribution of the near-field communication antenna can be made uniform and the magnetic field intensity can be large, so that the presence of the card can be effectively identified.

[0041] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0042] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0043] Figure 1 is one of the structural schematic diagrams of a near-field communication antenna provided by the embodiments of the present application;

[0044] Figure 2 is the second of the structural schematic diagrams of a near-field communication antenna provided by the embodiments of the present application;

[0045] Figure 3 is Figure 2 The partial enlarged view of position A in [it];

[0046] Figure 4 is the schematic diagram of the current direction of the antenna provided by the embodiment of the present application;

[0047] Figure 5 is the schematic diagram of the magnetic field distribution of the antenna provided by the embodiment of the present application;

[0048] Figure 6 is the schematic diagram of the return loss of the antenna provided by the embodiment of the present application;

[0049] Figure 7 is the schematic diagram of the structure of a wireless charging device provided by the embodiment of the present application.

[0050] Reference numerals: 1. Substrate, 11. First surface, 12. Second surface, 2. Antenna body, 21. First coil part, 211. First coil, 2111. First connection end, 2112. Second connection end, 22. Second coil part, 221. Second coil, 23. Cross-connection part, 231. First connection line, 232. Second connection line, 3. Metal housing, 4. Wireless charging coil, X. First direction, Y. Second direction, Z. Third direction. Detailed implementation manners

[0051] Hereinafter, embodiments of the present utility model will be described in detail. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0052] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally means that the related objects before and after are in an "or" relationship.

[0053] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 utility model.

[0054] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0055] The embodiment of the present application provides a near-field communication antenna. The near-field communication antenna of the present application will be described in detail below with reference to the drawings.

[0056] Refer to Figures 1 to 2 , which shows a schematic structural diagram of a near-field communication antenna provided by an embodiment of the present application. Refer to Figure 3 , which shows Figure 2 A partial enlarged view of position A in Figure 4 , which shows a schematic diagram of the current direction of the antenna provided by an embodiment of the present application. Refer to Figure 5 , which shows a schematic diagram of the return loss of the antenna provided by an embodiment of the present application. Refer to Figure 6 , which shows a schematic diagram of the magnetic field distribution of the antenna provided by an embodiment of the present application.

[0057] As Figures 1 to 2As shown in the figure, the present application provides a near-field communication antenna, including: a first coil portion 21 and a second coil portion 22. The first coil portion 21 is disposed circumferentially around the second coil portion 22 and is connected to the second coil portion 22. The ratio of the outer dimension of the first coil portion 21 to the outer dimension of the second coil portion 22 is 2 to 2.5, and the ratio of the inner dimension of the first coil portion 21 to the outer dimension of the second coil portion 22 is 1.5 to 2. In the embodiment of the present application, the outer first coil portion 21 can enhance the magnetic field intensity in the edge region of the near-field communication antenna and eliminate the interference of the external environment. The inner second coil portion 22 can enhance the magnetic field intensity in the central region of the near-field communication antenna. More importantly, by controlling the size ratio of the first coil portion 21 to the second coil portion 22, the overall magnetic field distribution of the near-field communication antenna can be made uniform and the magnetic field intensity can be relatively large, so that the presence of the card can be effectively identified.

[0058] Furthermore, the ratio of the outer dimension of the first coil portion 21 to the inner dimension of the second coil portion 22 is 2.2 to 2.8, and the ratio of the inner dimension of the first coil portion 21 to the inner dimension of the second coil portion 22 is 1.8 to 2.2. By increasing the ratio control of the outer dimension of the first coil portion 21 to the inner dimension of the second coil portion 22, and the inner dimension of the first coil portion 21 to the inner dimension of the second coil portion 22, the uniformity of the magnetic field distribution and the intensity of the magnetic field of the near-field communication antenna can be further improved, which is beneficial to further effectively identifying the presence of the card.

[0059] It should be noted that taking the first coil portion 21 as an example, the inner dimension refers to the dimension of the inner edge of the first coil portion 21 close to its center. When the inner edge of the first coil portion 21 is circular, the inner dimension is the diameter of the inner edge of the first coil portion 21. When the inner edge of the first coil portion 21 is rectangular, the inner dimension is the length or width of the inner edge of the first coil portion 21. The outer dimension refers to the dimension of the outer edge of the first coil portion 21 away from its center. When the outer edge of the first coil portion 21 is circular, the outer dimension is the diameter of the outer edge of the first coil portion 21. When the outer edge of the first coil portion 21 is rectangular, the outer dimension is the length or width of the outer edge of the first coil portion 21. The same applies to the second coil portion 22. In one embodiment, as Figure 1 shown, for the first coil portion 21 and the second coil portion 22 with a rectangular shape, the outer dimension of the first coil portion 21 refers to the width of the outer edge of the first coil portion 21, and the inner dimension of the first coil portion 21 refers to the width of the inner edge of the first coil portion 21. The outer dimension of the second coil portion 22 refers to the width of the outer edge of the second coil portion 22, and the inner dimension of the second coil portion 22 refers to the width of the inner edge of the second coil portion 22.

[0060] In practical applications, the near-field communication antenna includes a substrate 1 and an antenna body 2 disposed on the surface of the substrate 1. In the embodiments of the present application, the first coil portion 21 and the second coil portion 22 together form the antenna body 2 of the near-field communication antenna, thereby simplifying the structure of the near-field communication antenna and facilitating processing and installation. The shapes of the first coil portion 21 and the second coil portion 22 in the embodiments of the present application include, but are not limited to, rectangle, circle, polygon, etc., which are not limited herein, and those skilled in the art can adjust according to actual needs. When the near-field communication antenna is applied to a wireless charging device, considering that common devices to be charged and wireless charging devices on the market are usually rectangular, in one embodiment, the outer shapes of the first coil portion 21 and the second coil portion 22 are generally rectangular, so that the antenna body 2 can cover the wireless charging device as much as possible, effectively avoiding the existence of an identification blind area for the target object (such as a card).

[0061] In some alternative embodiments of the present application, the number of coils of the first coil portion 21 is greater than the number of coils of the second coil portion 22. Further, the number of coils of the first coil portion 21 is A, and the number of coils of the second coil portion 22 is B, satisfying: A:B = (2 - 4):1, and both A and B are positive integers.

[0062] According to Figure 4 the current flow direction and the right-hand rule, it can be known that the magnetic field direction of the first coil portion 21 is opposite to the magnetic field direction of the second coil portion 22. Therefore, when the card is located within the projection range of the first coil portion 21 along the third direction Z, part of the magnetic field passing through the card will be cancelled out, resulting in a decrease in magnetic flux. Based on this, when the number of coils of the first coil portion 21 is relatively large, the magnetic field intensity of the first coil portion 21 is greater than that of the second coil portion 22. In this way, even if the card is placed within the projection range of the first coil portion 21 along the third direction Z, it can ensure that the magnetic flux passing through the card is large enough, so as to effectively identify the card. After testing, when the ratio of the number of coils A of the first coil portion 21 to the number of coils B of the second coil portion 22 satisfies (2 - 4):1, the identification accuracy of the card can be further improved.

[0063] In some alternative embodiments of the present application, the number of coils of the first coil portion 21 satisfies: 2 turns ≤ A ≤ 6 turns; the number of coils of the second coil portion 22 satisfies: 1 turn ≤ B ≤ 3 turns. Preferably, the number of coils of the first coil portion 21 satisfies: 3 turns ≤ A ≤ 4 turns; the number of coils of the second coil portion 22 satisfies: 1 turn ≤ B ≤ 2 turns.

[0064] In practical applications, for example, when applying a near - field communication antenna to a wireless charging device, when a device to be charged (such as a smart phone) and a target object (such as a card) are placed on the wireless charging device at the same time, due to the strong metallic property of the smart phone, a stronger magnetic field is required to effectively identify the card. Generally speaking, as the number of turns of the first coil part 21 and the second coil part 22 increases, the magnetic field of the antenna body 2 becomes stronger; however, in the entire radio - frequency system, an increase in the number of turns of the coil will cause an increase in the system impedance of the antenna body 2, which will instead reduce the magnetic field strength of the entire system. Based on this, when the number of turns of the first coil part 21 is 2 - 6 turns and the number of turns of the second coil part 22 is 1 - 3 turns, the antenna body 2 can have a relatively large magnetic field strength as a whole, so as to better identify the card. In addition, since the first coil part 21 is located on the outside, that is, in the edge area of the entire antenna body 2, when 2 - 6 turns of coils are set, the magnetic field strength in the edge area of the antenna body 2 can be increased, that is, the range of the identification area can be expanded, and the card located near the periphery of the antenna body 2 can also be effectively identified. Herein, the identification area refers to the area where the card can be effectively identified, and the identification area is usually larger than the area covered by the antenna body 2.

[0065] In some alternative embodiments of the present application, the near - field communication antenna further includes: a substrate 1, and the first coil part 21 and the second coil part 22 are arranged on the surface of the substrate 1.

[0066] It should be noted that near - field communication (NFC) is a high - frequency wireless communication technology, and its operating frequency is usually at the frequency point of 13.56 MHz. In the embodiments of the present application, the materials of the substrate 1, the first coil part 21, and the second coil part 22 are not limited, and those skilled in the art can adjust them according to actual needs. In one of the embodiments, the substrate 1 is made of Rogers5880 material with a dielectric constant of 2.2. This material has low cost and is easy to process, and has lower signal delay and better performance in high - frequency applications. The first coil part 21 and the second coil part 22 are made of metallic copper material. This material has low cost and is widely used, and has excellent electrical conductivity and anti - interference performance, which is beneficial to reducing the cost of the near - field communication antenna and improving the stability and reliability of near - field communication. In addition, in one of the embodiments, the substrate 1 is a rectangular plate. In this case, the first direction X refers to the length direction of the substrate 1, the second direction Y refers to the width direction of the substrate 1, the third direction Z is the thickness direction of the substrate 1, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs.

[0067] In some alternative embodiments of the present application, the thickness of the substrate 1 is 0.5 - 1 mm. By controlling the thickness of the substrate 1, the overall strength of the near - field communication antenna can be improved, which is beneficial to improving its service life.

[0068] In some alternative embodiments of the present application, the first coil portion 21 includes: at least one first coil 211, and the first coil 211 is rectangular; wherein, the length of the outermost first coil 211 is L1, and the width of the outermost first coil 211 is W1, satisfying: W1:L1 = 1:(1 to 3). Further, the length of the outermost first coil 211 satisfies: 80 mm ≤ L1 ≤ 150 mm, and the width of the outermost first coil 211 satisfies: 40 mm ≤ W1 ≤ 100 mm.

[0069] In the embodiments of the present application, since the ratio of the width to the length of the outermost first coil 211 satisfies 1:(1 to 3), and the length and width respectively satisfy: 80 mm ≤ L1 ≤ 150 mm and 40 mm ≤ W1 ≤ 100 mm. In this way, since the identification area is generally larger than the area covered by the antenna body 2, that is, the area enclosed by the outermost first coil 211. When the size of the outermost first coil 211 meets the above numerical range, through testing, the identification area of the antenna body 2 can basically cover the sizes of common smartphones on the market at present. That is, when smartphones of different sizes and cards are placed on the wireless charging device at the same time, the near-field communication antenna of the present application can always effectively identify the cards, which is beneficial to protecting the cards from being damaged by the wireless charging device. In one of the embodiments, when 110 mm ≤ L1 ≤ 130 mm and 60 mm ≤ W1 ≤ 85 mm, on the premise of ensuring a sufficient identification area, the magnetic field strength of the near-field communication antenna can be further increased, thereby further improving the identification accuracy of the cards.

[0070] It should be noted that in other application scenarios, such as the wireless charging application scenario of smart watches, since the sizes of smart watches are generally small, the size of the outermost first coil 211 can be adaptively reduced to better fit smart watches.

[0071] In some alternative embodiments of the present application, the second coil portion 22 includes: at least one second coil 221, and the second coil 221 is rectangular; wherein, the length of the outermost second coil 221 is L2, and the width of the outermost second coil 221 is W2, satisfying: W2:L2 = 1:(2 to 4). Further, the length of the outermost second coil 221 satisfies: 63 mm ≤ L2 ≤ 133 mm, and the width of the outermost second coil 221 satisfies: 10 mm ≤ W2 ≤ 30 mm.

[0072] In practical applications, in order to increase the recognition area of the card, the area of the first coil portion 21 is relatively large, which may result in a relatively weak magnetic field intensity in the middle area, and there may be a problem that the card cannot be effectively recognized. Based on this, the present application provides a second coil portion 22, and the ratio of the width to the length of the second coil 221 located on the outermost side satisfies 1:(1-3), and the length and width respectively satisfy: 63 mm ≤ L2 ≤ 133 mm and 10 mm ≤ W2 ≤ 30 mm. In this way, based on the theory that the smaller the area enclosed by the coil, the stronger the magnetic field, the embodiment of the present application can improve the magnetic field intensity in the middle area of the antenna body 2 of the near-field communication antenna by providing the second coil portion 22, so as to better recognize the card. In addition, as Figure 1 shown, by controlling the dimensions of the second coil 221, that is, the length and width of the second coil 221, the middle area of the antenna body 2 can be divided into three regions, and the widths of the three regions along the second direction Y are approximately the same. In this way, the magnetic field in the middle area can be more evenly distributed, effectively avoiding the problem of recognition blind spots. In addition, considering that the width of the smallest common card on the market is about 26 mm, by controlling the width of the second coil 221 along the second direction Y to be 10-30 mm, effective recognition of the existing smallest card can be achieved, that is, the near-field communication antenna of the present application can effectively recognize cards of different sizes, thereby improving the versatility of the near-field communication antenna. In one embodiment, when 93 mm ≤ L1 ≤ 113 mm and 20 mm ≤ W1 ≤ 26 mm, the magnetic field intensity of the antenna body 2 can be further increased while ensuring the uniform distribution of the magnetic field of the antenna body 2, thereby further improving the recognition accuracy of the card.

[0073] In some alternative embodiments of the present application, as Figure 3 shown, the distance between two adjacent coils in the first coil portion 21, and / or the distance between two adjacent coils in the second coil portion 22, and / or the distance between two adjacent coils of the first coil portion 21 and the second coil portion 22 is W3, satisfying 0.3 mm ≤ W3 ≤ 3 mm.

[0074] Generally speaking, the smaller the spacing between the coils, the stronger the overall magnetic field intensity of the near-field communication antenna; the larger the spacing between the coils, the weaker the overall magnetic field intensity of the near-field communication antenna. That is, by controlling the spacing between two adjacent coils, the overall magnetic field intensity of the near-field communication antenna can be appropriately increased. In addition, when multiple turns of coils are provided in the first coil portion 21 and / or the second coil portion 22, part of the magnetic field will be cancelled due to the opposite magnetic field directions between two adjacent coils. By controlling the spacing between two adjacent coils, the degree of magnetic field cancellation between two adjacent coils can be reduced, which is beneficial to increasing the magnetic field intensity of the first coil portion 21 and the second coil portion 22. Based on this, in order to increase the magnetic field intensity of the antenna body 2, in the embodiments of the present application, the spacing between two adjacent coils in the first coil portion 21, and / or the spacing between two adjacent coils in the second coil portion 22, and / or the spacing W3 between two adjacent coils of the first coil portion 21 and the second coil portion 22 is controlled to be 0.3 mm to 3 mm. In one of the embodiments, when W3 satisfies 0.5 mm to 2 mm, the overall magnetic field intensity of the near-field communication antenna can be further increased.

[0075] In some alternative embodiments of the present application, the width of the coil is 0.3 mm to 2 mm. Generally speaking, when other parameters, such as the number of coils and the spacing, remain unchanged, as the width of the coil increases, the magnetic field distribution will be more uniform. However, the overall impedance of the antenna body 2 will also increase accordingly, resulting in a decrease in the magnetic field intensity. In order to control the overall impedance of the antenna body 2 within a certain range, the width of the coil in the embodiments of the present application is 0.3 mm to 2 mm, so that the antenna body 2 has both the advantages of uniform magnetic field distribution and relatively large magnetic field intensity, thereby further improving the recognition effect on the card. In one of the embodiments, the width of the coil is 0.5 mm to 1 mm, so that the uniformity of the magnetic field distribution and the intensity of the magnetic field can be further improved.

[0076] It should be noted that the coil includes, but is not limited to, a circular coil (i.e., a coil with a circular cross-section), a flat coil (i.e., a coil with a flat cross-section), or other types of coils. It can be understood that when the coil is a circular coil, the width of the coil is the diameter of the circular coil; when the coil is a flat coil, the width of the coil is the width of the projection of the flat coil in the third direction Z.

[0077] In some alternative embodiments of the present application, the near-field communication antenna further includes a cross-connection portion 23, which is used for two adjacent coils in the first coil portion 21, and / or two adjacent coils in the second coil portion 22, and / or two adjacent coils between the first coil portion 21 and the second coil portion 22. Specifically, the substrate 1 includes a first surface 11 and a second surface 12 that are disposed away from each other along the thickness direction; the cross-connection portion 23 includes a first connection line 231 and a second connection line 232 that are cross-disposed in the thickness direction of the substrate 1, and the first connection line 231 is disposed on the first surface 11, and the second connection line 232 is disposed on the second surface 12 to connect two adjacent coils in the first coil portion 21, and / or two adjacent coils in the second coil portion 22, and / or two adjacent coils between the first coil portion 21 and the second coil portion 22.

[0078] In the embodiments of the present application, by providing the cross-connection portion 23, on the one hand, each coil can be connected to form a complete antenna loop to generate a stable magnetic field, as Figure 1 shown. On the other hand, the overall structure of the antenna body 2 can be symmetrically distributed, so that the magnetic field of the antenna body 2 is more evenly distributed in all directions, which is beneficial to improving the stability and reliability of near-field communication.

[0079] In one embodiment, as Figure 3 shown, when the cross-connection portion 23 connects two adjacent coils in the first coil portion 21, that is, the cross-connection portion 23 connects two adjacent first coils 211, along the extension direction of the first coil 211, the first coil 211 includes a first connection end 2111 and a second connection end 2112 that are spaced apart. The first connection line 231 is respectively connected to the first connection end 2111 of one of the two adjacent first coils 211 and the second connection end 2112 of the other. Similarly, the second connection line 232 is respectively connected to the second connection end 2112 of one of the two adjacent first coils 211 and the first connection end 2111 of the other, thereby realizing the conduction of two adjacent first coils 211.

[0080] In another embodiment, when the cross-connection part 23 connects two adjacent coils in the second coil part 22, that is, when the cross-connection part 23 connects two adjacent second coils 221, along the extending direction of the second coil 221, the second coil 221 includes a third connection end and a fourth connection end which are spaced apart. The first connection line 231 is respectively connected to the third connection end of one of the two adjacent second coils 221 and the fourth connection end of the other. Similarly, the second connection line 232 is respectively connected to the fourth connection end of one of the two adjacent second coils 221 and the third connection end of the other, thereby realizing the conduction of two adjacent second coils 221. It should be noted that the structure of the cross-connection part 23 connecting two adjacent coils in the second coil part 22 is not shown in the drawings of the embodiments of the present application, and reference can be made to Figure 3 for adjustment.

[0081] In still another embodiment, when the cross-connection part 23 connects two adjacent coils of the first coil part 21 and the second coil part 22, that is, when the cross-connection part 23 connects the adjacent first coil 211 and the second coil 221, the first connection line 231 is respectively connected to the first connection end 2111 of the first coil 211 and the fourth connection end of the second coil 221. Similarly, the second connection line 232 is respectively connected to the second connection end 2112 of the first coil 211 and the third connection end of the second coil 221, thereby realizing the conduction of the adjacent first coil 211 and the second coil 221. It should be noted that the structure of the cross-connection part 23 connecting two adjacent coils of the first coil part 21 and the second coil part 22 is not shown in the drawings of the embodiments of the present application, and reference can be made to Figure 3 for adjustment.

[0082] In some alternative embodiments of the present application, as Figure 1 shown, the first coil part 21, and / or the second coil part 22, and / or the cross-connection part 23 is a symmetric structure. Specifically, the first coil part 21, and / or the second coil part 22, and / or the cross-connection part 23 is symmetric in the first direction X and the second direction Y. In this way, the magnetic field of the entire antenna body 2 can be more evenly distributed in all directions, thereby improving the stability and reliability of near-field communication and being beneficial to improving the recognition effect on the card. As Figure 6 shown, the echo loss curve of the antenna body 2 is symmetrically distributed within a certain frequency band, indicating that the wiring of the antenna body 2 in the embodiments of the present application has good symmetry performance, thereby meeting electromagnetic compatibility. In addition, as Figure 6 known, when the frequency point of the antenna body 2 is 13.56 MHz, the echo loss of the antenna body 2 reaches -63.8 dB, indicating that the feeder and the antenna body 2 reach a good matching degree at this time, thereby improving the radiation efficiency of the antenna body 2 and being beneficial to improving the recognition accuracy of the card.

[0083] Based on the above content, in the case of applying the near - field communication antenna of the embodiments of the present application to a wireless charging device, the following five specific embodiments are provided.

[0084] Embodiment 1

[0085] The number of turns of the coil in the first coil part 21 is 2. Among them, the length L1 of the coil located on the outermost side of the first coil part 21 is 80 mm, and the width W1 is 40 mm; the number of turns of the coil in the second coil part 22 is 1. Among them, the length L2 of the coil located on the outermost side of the second coil part 22 is 63 mm, and the width is 10 mm; the distance between two adjacent coils in the first coil part 21, the distance between two adjacent coils in the second coil part 22, and the distance W3 between two adjacent coils of the first coil part 21 and the second coil part 22 are all 0.3 mm; the width of the coil is 0.3 mm. After detection, the identification area of this near - field communication antenna is 85×45 mm 2 , and when the detection current is satisfied, the identification success rate of the card is 98%, and the card protection success rate is 98%.

[0086] Embodiment 2

[0087] The number of turns of the coil in the first coil part 21 is 6. Among them, the length L1 of the coil located on the outermost side of the first coil part 21 is 150 mm, and the width W1 is 100 mm; the number of turns of the coil in the second coil part 22 is 3. Among them, the length L2 of the coil located on the outermost side of the second coil part 22 is 133 mm, and the width is 30 mm; the distance between two adjacent coils in the first coil part 21, the distance between two adjacent coils in the second coil part 22, and the distance W3 between two adjacent coils of the first coil part 21 and the second coil part 22 is 3 mm; the width of the coil is 2 mm. After detection, the identification area of this near - field communication antenna is 155×105 mm 2 , and when the detection current is satisfied, the identification success rate of the card is 80%, and the card protection success rate is 75%.

[0088] Embodiment 3

[0089] The number of turns of the coil in the first coil part 21 is 4. Among them, the length L1 of the coil located on the outermost side of the first coil part 21 is 110 mm, and the width W1 is 60 mm; the number of turns of the coil in the second coil part 22 is 2. Among them, the length L2 of the coil located on the outermost side of the second coil part 22 is 93 mm, and the width is 20 mm; the distance between two adjacent coils in the first coil part 21, the distance between two adjacent coils in the second coil part 22, and the distance W3 between two adjacent coils of the first coil part 21 and the second coil part 22 is 1 mm; the width of the coil is 0.5 mm. After detection, the identification area of this near - field communication antenna is 115×65 mm 2, when the detection current is satisfied, the card recognition success rate is 98%, and the card protection success rate is 95%.

[0090] Example 4

[0091] The number of turns of the coil in the first coil portion 21 is 4. Among them, the length L1 of the coil located on the outermost side of the first coil portion 21 is 130 mm, and the width W1 is 85 mm; the number of turns of the coil in the second coil portion 22 is 1. Among them, the length L2 of the coil located on the outermost side of the second coil portion 22 is 113 mm, and the width is 26 mm; the distance between two adjacent coils in the first coil portion 21, the distance between two adjacent coils in the second coil portion 22, and the distance W3 between two adjacent coils of the first coil portion 21 and the second coil portion 22 is 2 mm; the width of the coil is 1 mm. After testing, the recognition area of this near-field communication antenna is 135×90 mm 2 , when the detection current is satisfied, the card recognition success rate is 80%, and the card protection success rate is 90%.

[0092] Example 5

[0093] The number of turns of the coil in the first coil portion 21 is 4. Among them, the length L1 of the coil located on the outermost side of the first coil portion 21 is 120 mm, and the width W1 is 70 mm; the number of turns of the coil in the second coil portion 22 is 1. Among them, the length L2 of the coil located on the outermost side of the second coil portion 22 is 103 mm, and the width is 23 mm; the distance between two adjacent coils in the first coil portion 21, the distance between two adjacent coils in the second coil portion 22, and the distance W3 between two adjacent coils of the first coil portion 21 and the second coil portion 22 is 1.5 mm; the width of the coil is 0.8 mm. After testing, the recognition area of this near-field communication antenna is 125×75 mm 2 , when the detection current is satisfied, the card recognition success rate is 95%, and the card protection success rate is 95%.

[0094] In summary, the near-field communication antenna provided by the embodiments of the present application has at least the following advantages:

[0095] In the embodiments of the present application, by providing a first coil portion and a second coil portion located inside the first coil portion, and the ratio of the outer dimension of the first coil portion to the outer dimension of the second coil portion is 2 to 2.5, and the ratio of the inner dimension of the first coil portion to the outer dimension of the second coil portion is 1.5 to 2. In this way, the first coil portion located outside can enhance the magnetic field strength in the edge region of the near-field communication antenna and eliminate the interference from the external environment, and the second coil portion located inside can enhance the magnetic field strength in the central region of the near-field communication antenna. More importantly, by controlling the dimension ratio between the first coil portion and the second coil portion, the overall magnetic field distribution of the near-field communication antenna can be made uniform and the magnetic field strength can be relatively large, so that the presence of the card can be effectively identified.

[0096] Reference Figure 7 , shows a schematic structural diagram of a wireless charging device provided by an embodiment of the present application. As Figure 7 shown, an embodiment of the present application also provides a wireless charging device, including: a wireless charging coil 4 and the near-field communication antenna according to any one of the above embodiments, and the near-field communication antenna is spaced apart from the wireless charging coil 4. In one embodiment, the wireless charging coil 4 and the near-field communication antenna are spaced apart along the third direction Z, that is, the thickness direction of the near-field communication antenna substrate 1.

[0097] It should be noted that the structure of the near-field communication antenna in the embodiments of the present application is the same as that of the near-field communication antenna in any of the above embodiments, and its beneficial effects are also similar, so details are not described herein.

[0098] In some alternative embodiments of the present application, the distance between the near-field communication antenna and the wireless charging coil 4 is 1.3 mm to 1.5 mm. That is, the distance between the near-field communication antenna and the wireless charging coil 4 along the third direction Z is 1.3 mm to 1.5 mm. By controlling the distance between the near-field communication antenna and the wireless charging coil 4, the electromagnetic interference between the two can be reduced, and the recognition accuracy of the card can be improved.

[0099] It should be noted that the distance between the near-field communication antenna and the wireless charging coil 4 here actually refers to the distance between the antenna body 2 of the near-field communication antenna and the wireless charging coil 4. In practical applications, the antenna body 2 of the near-field communication antenna is usually disposed on the surface of the substrate 1 on the side facing away from the wireless charging coil 4. Therefore,

[0100] the distance between the near-field communication antenna and the wireless charging coil 4 here includes the thickness of the substrate 1.

[0101] In some alternative embodiments of the present application, the near - field communication antenna at least covers the wireless charging coil 4. In this way, the card placed in the charging area can be effectively protected, avoiding damage to the card caused by the relatively high power generated by the wireless charging coil 4 during the operation of the wireless charging device. In one embodiment, the projection of the near - field communication antenna on the plane perpendicular to the third direction Z at least covers the projection of the wireless charging coil 4 on the plane perpendicular to the third direction Z.

[0102] In some alternative embodiments of the present application, the wireless charging device further includes: a power supply module; the first coil portion includes at least one first coil, and the outermost first coil is connected to the power supply module. In this way, by connecting the outermost first coil 211 to the power supply module, a continuous and stable current can be provided for the antenna body 2, so as to generate a stable magnetic field. In one embodiment, the outermost first coil 211 includes an input end and an output end, and the input end and the output end are electrically connected to the positive pole and the negative pole of an external power supply module respectively.

[0103] In some alternative embodiments of the present application, the wireless charging device further includes a metal housing 3, and at least part of the near - field communication antenna and the wireless charging coil 4 are disposed inside the metal housing 3. Further, the metal housing 3 is provided with an installation cavity having an opening; the near - field communication antenna and the wireless charging coil 4 are disposed in the installation cavity, and the near - field communication antenna is disposed close to the opening of the installation cavity. Specifically, the opening is located at one end of the installation cavity along the third direction Z.

[0104] In the embodiments of the present application, by disposing at least part of the near - field communication antenna and the wireless charging coil 4 inside the metal housing 3, the near - field communication antenna and the wireless charging coil 4 can be effectively protected from damage, which is beneficial to improving the service life of the wireless charging coil 4 and the near - field communication antenna.

[0105] In some alternative embodiments of the present application, the wireless charging device further includes a cover plate, and the cover plate covers the opening. In this way, the near - field communication antenna can be further protected, which is beneficial to further improving the service life of the near - field communication antenna.

[0106] The embodiment of the present application further provides a wireless charging system, including: a controller and the wireless charging device in any of the above embodiments. The controller is respectively connected to the near-field communication antenna and the wireless charging coil 4. The near-field communication antenna is used to obtain the identification signal of the target object (such as a card), and the wireless charging coil 4 is used to charge the device to be charged. The controller is used to control the opening and closing of the wireless charging coil 4 based on the identification signal and send out an alarm message. In this way, by controlling the opening and closing of the wireless charging coil 4, the target object can be protected from being damaged by the working wireless charging coil 4, so as to effectively protect the target object. By sending out an alarm message, the user can be reminded to remove the card in time to ensure the charging of the device to be charged.

[0107] Specifically, when the target object is placed on the wireless charging device before the device to be charged, or when the target object and the device to be charged are placed on the wireless charging device at the same time, the controller can control the wireless charging coil 4 to remain closed and send out an alarm message. When the device to be charged is placed on the wireless charging device before the target object, the controller can control the wireless charging coil 4 to close and send out an alarm message.

[0108] It should be noted that in the embodiment of the present application, the structure of the wireless charging device is the same as that of the wireless charging device in any of the above embodiments, and its beneficial effects are similar, so they will not be elaborated here.

[0109] The embodiment of the present application further provides a vehicle, and the vehicle includes the above-mentioned wireless charging device.

[0110] It should be noted that in the embodiment of the present application, the structure of the wireless charging system is the same as that of the wireless charging system in any of the above embodiments, and its beneficial effects are similar, so they will not be elaborated here.

[0111] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A near field communication antenna, characterized in that: include: a first coil portion and a second coil portion, wherein the first coil portion is disposed in a circumferential direction of the second coil portion and is connected to the second coil portion; A ratio of an outer dimension of the first coil portion to an outer dimension of the second coil portion is 2 to 2.5, and a ratio of an inner dimension of the first coil portion to an outer dimension of the second coil portion is 1.5 to 2.

2. The near field communication antenna according to claim 1, characterized in that: A ratio of an outer dimension of the first coil portion to an inner dimension of the second coil portion is 2.2 to 2.8, and a ratio of an inner dimension of the first coil portion to an inner dimension of the second coil portion is 1.8 to 2.

2.

3. The near field communication antenna according to claim 1, characterized in that: The number of coils of the first coil portion is greater than the number of coils of the second coil portion.

4. The near field communication antenna according to claim 3, characterized in that: The number of coils in the first coil portion is A, and the number of coils in the second coil portion is B, satisfying: A:B=(2-4):1, and A and B are both positive integers.

5. The near field communication antenna according to claim 4, characterized in that: The number of coils of the first coil portion satisfies: 2 turns≤A≤6 turns.

6. The near field communication antenna according to claim 4, characterized in that: The number of coils of the second coil portion satisfies: 1 turn ≤ B ≤ 3 turns.

7. The near field communication antenna according to any one of claims 1 to 6, characterized in that: The first coil portion includes: at least one first coil, the first coil being rectangular; The length of the first coil located at the outermost side is L1, and the width of the first coil located at the outermost side is W1, which satisfies: W1:L1=1:(1-3). 8 . The near field communication antenna according to claim 7 , wherein the length of the first coil located at the outermost side satisfies: 80 mm ≤ L1 ≤ 150 mm, and the width of the first coil located at the outermost side satisfies: 40 mm ≤ W1 ≤ 100 mm.

9. The near field communication antenna according to any one of claims 1 to 6, characterized in that: The second coil portion includes: at least one second coil, the second coil being rectangular; The length of the second coil located at the outermost side is L2, and the width of the second coil located at the outermost side is W2, satisfying: W2:L2=1:(2-4).

10. The near field communication antenna according to claim 9, characterized in that: The length of the second coil located at the outermost side satisfies: 63mm≤L2≤133mm, and the width of the second coil located at the outermost side satisfies: 10mm≤W2≤30mm.

11. The near field communication antenna according to any one of claims 1 to 6, characterized in that: The distance between two adjacent coils in the first coil portion, and / or the distance between two adjacent coils in the second coil portion, and / or the distance between two adjacent coils in the first coil portion and the second coil portion is W3, satisfying 0.3mm≤W3≤3mm.

12. The near field communication antenna according to any one of claims 1 to 6, characterized in that: The width of the coil is 0.3 mm to 2 mm.

13. The near field communication antenna according to any one of claims 1 to 6, characterized in that: The near field communication antenna further includes a substrate, and the first coil portion and the second coil portion are arranged on a surface of the substrate.

14. The near field communication antenna according to claim 13, characterized in that: The thickness of the substrate is 0.5 mm to 1 mm.

15. The near field communication antenna according to claim 13, characterized in that: The near field communication antenna further includes a cross connection portion, which is used to connect two adjacent coils in the first coil portion, and / or two adjacent coils in the second coil portion, and / or two adjacent coils in the first coil portion and the second coil portion.

16. The near field communication antenna according to claim 15, characterized in that: The substrate comprises a first surface and a second surface which are arranged away from each other in a thickness direction; The cross-connection portion includes a first connection line and a second connection line that are cross-arranged in the thickness direction of the substrate, and the first connection line is arranged on the first surface, and the second connection line is arranged on the second surface to connect two adjacent coils in the first coil portion, and / or two adjacent coils in the second coil portion, and / or two coils adjacent to the first coil portion and the second coil portion.

17. The near field communication antenna according to claim 15, characterized in that: The first coil portion, and / or the second coil portion, and / or the cross-connection portion are / is a symmetrical structure.

18. A wireless charging device, characterized in that: include: A wireless charging coil and a near field communication antenna as described in any one of claims 1 to 17, wherein the near field communication antenna is spaced apart from the wireless charging coil.

19. The wireless charging device according to claim 18, characterized in that: The distance between the near field communication antenna and the wireless charging coil is 1.3 mm to 1.5 mm.

20. The wireless charging device according to claim 18, characterized in that: The near field communication antenna at least covers the wireless charging coil.

21. The wireless charging device according to claim 18, characterized in that: The wireless charging device also includes: a power supply module; The first coil part includes at least one first coil, and the first coil located at the outermost side is connected to the power supply module.

22. The wireless charging device according to any one of claims 18 to 21, characterized in that: The wireless charging device further includes: a metal shell, in which at least a portion of the near field communication antenna and the wireless charging coil are disposed.

23. The wireless charging device according to claim 22, characterized in that: The metal shell is provided with a mounting cavity having an opening; The near field communication antenna and the wireless charging coil are arranged in the installation cavity, and the near field communication antenna is arranged close to the opening of the installation cavity.

24. The wireless charging device according to claim 23, characterized in that: The wireless charging device further includes a cover plate, which is arranged to cover the opening.

25. A wireless charging system, characterized in that: include: A controller and a wireless charging device as described in any one of claims 18 to 24, wherein the controller is respectively connected to the near-field communication antenna and the wireless charging coil, the near-field communication antenna is used to obtain an identification signal of a target object, the wireless charging coil is used to charge a device to be charged, and the controller is used to control the opening and closing of the wireless charging coil based on the identification signal and issue an alarm message.

26. The wireless charging system according to claim 25, characterized in that: When the target object is placed on the wireless charging device before the device to be charged, or when the target object and the device to be charged are placed on the wireless charging device at the same time, the controller can control the wireless charging coil to remain closed and issue an alarm message.

27. The wireless charging system according to claim 25, characterized in that: In the case that the device to be charged is placed on the wireless charging device before the target object, the controller can control the wireless charging coil to be turned off and issue an alarm message.

28. A vehicle, characterized in that: The vehicle comprises the wireless charging system according to any one of claims 25-27.

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