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

Abstract

A near field communication antenna, a wireless charging device, a wireless charging system, and a vehicle. The near field communication antenna (10) comprises: a first coil portion (21) and a second coil portion (22), wherein the first coil portion (21) is arranged 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 any value in the range of 2-2.5, and the ratio of the inner dimension of the first coil portion (21) to the outer dimension of the second coil portion (22) is any value in the range of 1.5-2.

Description

Near-field communication antennas, wireless charging devices, wireless charging systems, and vehicles

[0001] This application claims priority to Chinese patent application No. 202422138783.1, filed on August 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of vehicle technology, and more particularly to a near-field communication antenna, a wireless charging device, a wireless charging system, and a vehicle. Background Technology

[0003] Near Field Communication Antenna (NFC antenna) is a short-range wireless communication technology. Due to its advantages of short transmission distance, high transmission speed, and high security, NFC antennas are widely used in fields such as identity authentication, access control systems, and ticketing systems. Summary of the Invention

[0004] This disclosure aims to provide a near-field communication antenna, a wireless charging device, a wireless charging system, and a vehicle to solve the problem that wireless charging devices in the related art have difficulty effectively recognizing cards.

[0005] In a first aspect, a near-field communication antenna is provided, comprising: a first coil portion and a second coil portion, wherein the first coil portion is disposed circumferentially around and connected to the second coil portion. The ratio of the external dimension of the first coil portion to the external dimension of the second coil portion is any value from 2 to 2.5, and the ratio of the internal dimension of the first coil portion to the external dimension of the second coil portion is any value from 1.5 to 2.

[0006] In some embodiments, the ratio of the external dimension of the first coil portion to the internal dimension of the second coil portion is any value from 2.2 to 2.8, and the ratio of the internal dimension of the first coil portion to the internal dimension of the second coil portion is any value from 1.8 to 2.2.

[0007] In some embodiments, the number of coils in the first coil section is greater than the number of coils in the second coil section.

[0008] In some embodiments, the number of coils in the first coil section is A, and the number of coils in the second coil section is B, satisfying: A:B = (2~4):1, and A and B are both positive integers.

[0009] In some embodiments, the number A of the coils in the first coil section satisfies: 2 turns ≤ A ≤ 6 turns.

[0010] In some embodiments, the number of coils B in the second coil section satisfies: 1 turn ≤ B ≤ 3 turns.

[0011] In some embodiments, the first coil portion includes at least one first coil, the at least one first coil being rectangular. The length of the outermost first coil in the at least one first coil is L1, and the width of the outermost first coil in the at least one first coil is W1, satisfying: W1:L1=1:(1~3).

[0012] In some embodiments, the length L1 of the outermost first coil satisfies: 80mm≤L1≤150mm, and the width W1 of the outermost first coil satisfies: 40mm≤W1≤100mm.

[0013] In some embodiments, the second coil portion includes at least one second coil, the at least one second coil being rectangular. The length of the outermost second coil in the at least one second coil is L2, and the width of the outermost second coil in the at least one second coil is W2, satisfying: W2:L2=1:(2~4).

[0014] In some embodiments, the length L2 of the outermost second coil satisfies: 63mm≤L2≤133mm, and the width W2 of the outermost second coil satisfies: 10mm≤W2≤30mm.

[0015] In some embodiments, at least one of the following is W3: the distance between two adjacent first coils in the first coil portion, the distance between two adjacent second coils in the second coil portion, or the distance between adjacent first coils and second coils in the first coil portion and the second coil portion, and satisfies 0.3mm≤W3≤3mm.

[0016] In some embodiments, the width of the conductor of the first coil of the first coil portion is any value from 0.3 mm to 2 mm, and the width of the conductor of the second coil of the second coil portion is any value from 0.3 mm to 2 mm.

[0017] In some embodiments, the near-field communication antenna further includes a substrate, wherein the first coil portion and the second coil portion are disposed on the surface of the substrate.

[0018] In some embodiments, the thickness of the substrate is any value between 0.5 mm and 1 mm.

[0019] In some embodiments, the near-field communication antenna further includes a cross-connection portion, which is configured to connect at least one of two adjacent first coils in the first coil portion, two adjacent second coils in the second coil portion, or adjacent first coils and second coils in the first coil portion and the second coil portion.

[0020] In some embodiments, the substrate includes a first surface and a second surface disposed opposite to each other along the thickness direction. The cross connection portion includes a first connecting line and a second connecting line that cross each other in the thickness direction of the substrate, with the first connecting line disposed on the first surface and the second connecting line disposed on the second surface, to connect at least one of two adjacent first coils in the first coil portion, two adjacent second coils in the second coil portion, or adjacent first coils and second coils in the first coil portion and the second coil portion.

[0021] In some embodiments, at least one of the first coil portion, the second coil portion, or the cross connection portion is a symmetrical structure.

[0022] Secondly, a wireless charging device is provided, comprising: a wireless charging coil and the aforementioned near-field communication antenna, wherein the near-field communication antenna and the wireless charging coil are spaced apart.

[0023] In some embodiments, the distance between the near-field communication antenna and the wireless charging coil is any value between 1.3 mm and 1.5 mm.

[0024] In some embodiments, the near-field communication antenna at least covers the wireless charging coil.

[0025] In some embodiments, the wireless charging device further includes a power supply module, wherein the first coil portion includes at least one first coil, and the outermost first coil of the at least one first coil is connected to the power supply module.

[0026] In some embodiments, the wireless charging device further includes a metal housing, wherein at least a portion of the near-field communication antenna and the wireless charging coil are disposed within the metal housing.

[0027] In some embodiments, the metal housing is provided with a mounting cavity having an opening. The near-field communication antenna and the wireless charging coil are disposed within the mounting cavity, with the near-field communication antenna positioned close to the opening of the mounting cavity.

[0028] In some embodiments, the wireless charging device further includes a cover plate that covers the opening.

[0029] Thirdly, a wireless charging system is provided, comprising: a controller and the aforementioned wireless charging device, wherein the controller is connected to the near-field communication antenna and the wireless charging coil respectively, the near-field communication antenna is configured to acquire an identification signal of a target object, the wireless charging coil is configured to charge the device to be charged, and the controller is configured to control the opening and closing of the wireless charging coil and issue an alarm message based on the identification signal.

[0030] In some embodiments, 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 simultaneously, the controller may control the wireless charging coil to remain off and issue an alarm message.

[0031] In some embodiments, when the device to be charged is placed on the wireless charging device before the target object, the controller may control the wireless charging coil to turn off and issue an alarm message.

[0032] Fourthly, a vehicle is provided that includes the aforementioned wireless charging system.

[0033] In this embodiment, a first coil portion and a second coil portion located inside the first coil portion are provided, with the ratio of the external dimensions of the first coil portion to the external dimensions of the second coil portion being any value between 2 and 2.5, and the ratio of the internal dimensions of the first coil portion to the external dimensions of the second coil portion being any value between 1.5 and 2. In this way, the externally located first coil portion can enhance the magnetic field strength in the edge region of the near-field communication antenna, eliminating interference from the external environment, while the internally located second coil portion can enhance the magnetic field strength in the central region of the near-field communication antenna. More importantly, by controlling the size ratio of the first coil portion to the second coil portion, the overall magnetic field distribution of the near-field communication antenna can be made uniform and the magnetic field strength larger, thereby effectively identifying the presence of the card.

[0034] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0035] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0036] Figure 1 is a schematic diagram of a near-field communication antenna according to some embodiments;

[0037] Figure 2 is a schematic diagram of another structure of a near-field communication antenna according to some embodiments;

[0038] Figure 3 is a magnified view of a portion of circle A in Figure 2;

[0039] Figure 4 is a schematic diagram of the current direction of an antenna according to some embodiments;

[0040] Figure 5 is a schematic diagram of the magnetic field distribution of an antenna according to some embodiments;

[0041] Figure 6 is a schematic diagram of the return loss of an antenna according to some embodiments;

[0042] Figure 7 is a structural schematic diagram of a wireless charging device according to some embodiments;

[0043] Figure 8 is a block diagram of a wireless charging system according to some embodiments;

[0044] Figure 9 is a block diagram of a vehicle according to some embodiments.

[0045] Reference numerals: 1000-vehicle, 200-wireless charging system, 300-controller, 100-wireless charging device, 10-near-field communication antenna, 1-substrate, 11-first surface, 12-second surface, 2-antenna body, 21-first coil section, 211-first coil, 2111-first connection end, 2112-second connection end, 22-second coil section, 221-second coil, 23-cross connection section, 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

[0046] Embodiments of this disclosure will now be described in detail, examples of which are illustrated in the accompanying 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 accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0047] The terms "first" and "second" in this disclosure may explicitly or implicitly include one or more of the features. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0048] In the description of this disclosure, it should be understood that the terms “center,” “length,” “width,” “thickness,” “upper,” “lower,” “left,” “right,” “inner,” “outer,” “circumferential,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0049] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0050] In related technologies, near-field communication antennas typically include multiple coils. Card recognition is achieved through electromagnetic induction between these coils and the card (such as an ID card, access card, or public transport card). However, improper coil arrangement can lead to uneven magnetic field distribution or insufficient magnetic field strength in the near-field communication antenna, thus affecting effective card recognition.

[0051] Therefore, some embodiments of the present disclosure provide a near-field communication antenna 10, and the near-field communication antenna 10 of some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0052] Referring to Figures 1 and 2, a structural schematic diagram of a near-field communication antenna according to some embodiments is shown; referring to Figure 3, a partial enlarged view of circle A in Figure 2 is shown; referring to Figure 4, a schematic diagram of the current direction of the antenna according to some embodiments is shown; referring to Figure 5, a schematic diagram of the return loss of the antenna according to some embodiments is shown; and referring to Figure 6, a schematic diagram of the magnetic field distribution of the antenna according to some embodiments is shown.

[0053] As shown in Figures 1 and 2, some embodiments of this disclosure provide a near-field communication antenna 10, which includes a first coil portion 21 and a second coil portion 22. The first coil portion 21 is disposed circumferentially around and connected to the second coil portion 22. The ratio of the external dimensions of the first coil portion 21 to the external dimensions of the second coil portion 22 is any value from 2 to 2.5, and the ratio of the internal dimensions of the first coil portion 21 to the external dimensions of the second coil portion 22 is any value from 1.5 to 2. In some embodiments of this disclosure, the externally located first coil portion 21 can enhance the magnetic field strength in the edge region of the near-field communication antenna 10 and eliminate interference from the external environment, while the internally located second coil portion 22 can enhance the magnetic field strength in the central region of the near-field communication antenna 10. 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 10 can be made uniform and the magnetic field strength larger, thereby effectively identifying the presence of a card.

[0054] In some embodiments, the ratio of the external dimension of the first coil portion 21 to the internal dimension of the second coil portion 22 is any value from 2.2 to 2.8, and the ratio of the internal dimension of the first coil portion 21 to the internal dimension of the second coil portion 22 is any value from 1.8 to 2.2. By increasing the control over the external dimension of the first coil portion 21 and the internal dimension of the second coil portion 22, as well as the ratio of the internal dimensions of the first coil portion 21 and the internal dimensions of the second coil portion 22, the uniformity of the magnetic field distribution and the strength of the magnetic field of the near-field communication antenna 10 can be improved, which is beneficial for effectively identifying the presence of the card.

[0055] It should be noted that, taking the first coil portion 21 as an example, the internal dimension refers to the dimension of the inner edge of the first coil portion 21 near its center. When the inner edge of the first coil portion 21 is circular, the internal 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 internal dimension is the length or width of the inner edge of the first coil portion 21. The external 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 external 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 external dimension is the length or width of the outer edge of the first coil portion 21. The second coil portion 22 is similar. In some embodiments, as shown in FIG1, for the first coil portion 21 and the second coil portion 22 with rectangular shapes, the external dimension of the first coil portion 21 refers to the width of the outer edge of the first coil portion 21, and the internal dimension of the first coil portion 21 refers to the width of the inner edge of the first coil portion 21. The external dimension of the second coil portion 22 refers to the width of the outer edge of the second coil portion 22, and the internal dimension of the second coil portion 22 refers to the width of the inner edge of the second coil portion 22.

[0056] In practical applications, the near-field communication antenna 10 includes a substrate 1 and an antenna body 2 disposed on the surface of the substrate 1. In some embodiments of this disclosure, the first coil portion 21 and the second coil portion 22 together constitute the antenna body 2 of the near-field communication antenna 10, thereby simplifying the structure of the near-field communication antenna 10 and facilitating its processing and installation. The shapes of the first coil portion 21 and the second coil portion 22 in some embodiments of this disclosure include, but are not limited to, rectangles, circles, polygons, etc., and are not limited herein. Those skilled in the art can adjust them according to actual needs. When the near-field communication antenna 10 is applied to a wireless charging device 100, considering that commonly available charging devices and the wireless charging device 100 are usually rectangular, in some embodiments of this disclosure, the first coil portion 21 and the second coil portion 22 are approximately rectangular in shape, so that the antenna body 2 can cover the wireless charging device 100 as much as possible, effectively avoiding the existence of blind spots for target object (such as cards) recognition.

[0057] In some embodiments of this disclosure, the number of coils in the first coil section 21 is greater than the number of coils in the second coil section 22. For example, the number of coils in the first coil section 21 is A, and the number of coils in the second coil section 22 is B, where A and B satisfy: A:B = (2~4):1, and both A and B are positive integers.

[0058] According to the current flow direction in Figure 4 and the right-hand rule, the magnetic field direction of the first coil section 21 is opposite to that of the second coil section 22 (see Figure 5). Therefore, when the card is located within the projection range of the first coil section 21 along the third direction Z (i.e., the thickness direction of the substrate 1), the magnetic field passing through the card will be partially canceled out, resulting in a decrease in magnetic flux. Based on this, when the number of coils in the first coil section 21 is large, the magnetic field strength of the first coil section 21 is greater than that of the second coil section 22. Thus, even if the card is placed within the projection range of the first coil section 21 along the third direction Z, the magnetic flux passing through the card can be guaranteed to be large enough, thereby effectively identifying the card. Tests have shown that when the ratio of the number of coils A in the first coil section 21 to the number of coils B in the second coil section 22 satisfies A:B = (2~4):1, the card recognition accuracy can be improved.

[0059] In some embodiments of this disclosure, the number of coils A in the first coil section 21 satisfies: 2 turns ≤ A ≤ 6 turns. The number of coils B in the second coil section 22 satisfies: 1 turn ≤ B ≤ 3 turns. For example, the number of coils A in the first coil section 21 satisfies: 3 turns ≤ A ≤ 4 turns. The number of coils B in the second coil section 22 satisfies: 1 turn ≤ B ≤ 2 turns.

[0060] In practical applications, such as when the near-field communication antenna 10 is used in a wireless charging device 100, when the device to be charged (such as a smartphone) and the target object (such as a card) are placed on the wireless charging device 100 simultaneously, the strong metallic properties of the smartphone will interfere with the magnetic field of the near-field communication antenna 10 to a certain extent. Therefore, a stronger magnetic field is required to effectively identify the card. Generally speaking, as the number of coils in the first coil section 21 and the second coil section 22 increases, the magnetic field of the antenna body 2 will also become stronger. However, in the entire radio frequency system, increasing the number of coils will lead to an increase in the system impedance of the antenna body 2, which will actually reduce the overall magnetic field strength of the system.

[0061] Based on this, when the number of coils in the first coil section 21 is 2-6 turns and the number of coils in the second coil section 22 is 1-3 turns, the antenna body 2 as a whole can have a larger magnetic field strength, thus enabling better card recognition. Furthermore, since the first coil section 21 is located on the outer side, i.e., at the edge of the entire antenna body 2, when the first coil section 21 has 2-6 turns, the magnetic field strength at the edge of the antenna body 2 can be increased, thereby expanding the recognition area. This allows for effective recognition of cards located near the periphery of the antenna body 2. It should be noted that the recognition area refers to the area where the near-field communication antenna 10 can effectively recognize cards, and the recognition area is typically larger than the area covered by the antenna body 2.

[0062] In some embodiments of this disclosure, the near-field communication antenna 10 further includes a substrate 1, and a first coil portion 21 and a second coil portion 22 are disposed on the surface of the substrate 1.

[0063] It should be noted that Near Field Communication (NFC) is a high-frequency wireless communication technology, typically operating at a frequency of 13.56 MHz. This disclosure does not limit the materials of the substrate 1, the first coil portion 21, and the second coil portion 22 in some embodiments; those skilled in the art can adjust them according to actual needs. In some embodiments, the substrate 1 is made of Rogers 5880 substrate material, which has a dielectric constant of 2.2, is low in cost, easy to process, and exhibits lower signal delay and better performance in high-frequency applications. The first coil portion 21 and the second coil portion 22 are made of copper, a low-cost, widely used material with excellent conductivity and anti-interference properties, which helps reduce the cost of the near-field communication antenna 10 and improve the stability and reliability of near-field communication. Furthermore, in some 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, and the third direction Z refers to the thickness direction of the substrate 1, with the first direction X, the second direction Y, and the third direction Z being mutually perpendicular.

[0064] In some embodiments of this disclosure, the thickness of the substrate 1 is any value from 0.5 to 1 mm. For example, the thickness of the substrate 1 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. In this way, by controlling the thickness of the substrate 1, the overall strength of the near-field communication antenna 10 can be improved, which is beneficial to improving the service life of the substrate 1.

[0065] In some embodiments of this disclosure, as shown in Figures 1 and 2, the first coil portion 21 includes at least one first coil 211, which is rectangular. The length of the outermost first coil 211 is L1, and the width of the outermost first coil 211 is W1, where W1 and L1 satisfy: W1:L1 = 1:(1~3).

[0066] In some embodiments, the length L1 of the outermost first coil 211 satisfies: 80mm≤L1≤150mm, and the width W1 of the outermost first coil 211 satisfies: 40mm≤W1≤100mm.

[0067] In some embodiments of this disclosure, the ratio of the width W1 to the length L1 of the outermost first coil 211 satisfies W1:L1=1:(1~3), and the length L1 and width W1 satisfy 80mm≤L1≤150mm and 40mm≤W1≤100mm, respectively. Thus, since the recognition area is generally larger than the area covered by the antenna body 2, which is the area enclosed by the outermost first coil 211, when the size of the outermost first coil 211 meets the above-mentioned numerical range, tests show that the recognition area of ​​the antenna body 2 can essentially cover the size of commonly available smartphones. That is, when smartphones of different sizes and cards are placed simultaneously on the wireless charging device 100, the near-field communication antenna 10 of this disclosure can always effectively recognize the card, which helps protect the card from damage by the wireless charging device 100.

[0068] In some embodiments, the length L1 of the outermost first coil 211 satisfies: 110mm≤L1≤130mm, and the width W1 of the outermost first coil 211 satisfies: 60mm≤W1≤85mm. In this way, while ensuring that the recognition area is sufficient, the magnetic field strength of the near-field communication antenna 10 can be increased, thereby improving the recognition accuracy of the card.

[0069] It should be noted that in other application scenarios, such as wireless charging for smartwatches, since smartwatches are generally small in size, the size of the outermost first coil 211 can be appropriately reduced to better fit the smartwatch.

[0070] In some embodiments of this disclosure, the second coil portion 22 includes at least one second coil 221, which is rectangular. The length of the outermost second coil 221 is L2, and the width of the outermost second coil 221 is W2, where W2 and L2 satisfy: W2:L2 = 1:(2~4).

[0071] In some embodiments, the length L2 of the outermost second coil 221 satisfies: 63mm≤L2≤133mm, and the width W2 of the outermost second coil 221 satisfies: 10mm≤W2≤30mm.

[0072] In practical applications, to increase the card recognition area of ​​the near-field communication antenna 10, the area of ​​the first coil portion 21 is relatively large. This results in a weaker magnetic field strength in the middle region, which may lead to ineffective card recognition. Based on this, some embodiments of this disclosure include a second coil portion 22. The ratio of the width W2 to the length L2 of the outermost second coil 221 satisfies W2:L2=1:(2~4), and the length L2 and width W2 satisfy: 63mm≤L2≤133mm and 10mm≤W2≤30mm, respectively. Thus, based on the theory that a smaller area enclosed by the coil results in a stronger magnetic field, some embodiments of this disclosure, by including the second coil portion 22, can improve the magnetic field strength in the middle region of the antenna body 2 of the near-field communication antenna 10, thereby enabling better card recognition.

[0073] Furthermore, as shown in Figure 1, by controlling the dimensions of the second coil 221, namely its length and width, the middle region 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. This allows for a more uniform distribution of the magnetic field in the middle region, effectively avoiding the problem of blind spots in recognition. Moreover, considering that the width of the smallest commonly available card is approximately 26mm, by controlling the width of the second coil 221 along the second direction Y within the range of 10–30mm, effective recognition of the smallest cards in related technologies can be achieved. That is, for cards of different sizes, the near-field communication antenna 10 of some embodiments of this disclosure can effectively recognize them, thereby improving the versatility of the near-field communication antenna 10.

[0074] In some embodiments, the length L2 of the outermost second coil 221 satisfies: 93mm≤L2≤113mm, and the width W2 of the outermost second coil 221 satisfies: 20mm≤W2≤26mm. In this way, while ensuring that the magnetic field distribution of the antenna body 2 is uniform, the magnetic field strength of the antenna body 2 can be increased, thereby improving the card recognition accuracy.

[0075] In some embodiments of this disclosure, when the first coil portion 21 includes a plurality of first coils 211 and the second coil portion 22 includes a plurality of second coils 221, as shown in FIG3, at least one of the following is W3: the distance between two adjacent first coils 211 in the first coil portion 21, the distance between two adjacent second coils 221 in the second coil portion 22, or the distance between adjacent first coils 211 and second coils 221 in the first coil portion 21 and the second coil portion 22. W3 satisfies 0.3mm ≤ W3 ≤ 3mm. For example, W3 is 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm.

[0076] Generally, the smaller the spacing between the coils, the stronger the overall magnetic field strength of the near-field communication antenna 10. Conversely, the larger the spacing between the coils, the weaker the overall magnetic field strength of the near-field communication antenna 10. That is, by controlling the spacing between two adjacent coils in the near-field communication antenna 10, the overall magnetic field strength of the near-field communication antenna 10 can be appropriately increased. Furthermore, when at least one of the first coil section 21 or the second coil section 22 is provided with a multi-turn coil, there will be partial magnetic field cancellation between two adjacent coils due to their opposite magnetic field directions. By controlling the spacing between two adjacent coils, the degree of magnetic field cancellation between the two adjacent coils can be reduced, which is beneficial for increasing the magnetic field strength of the first coil section 21 and the second coil section 22.

[0077] Based on this, in order to improve the magnetic field strength of the antenna body 2, some embodiments of this disclosure control at least one of the following (i.e., W3): the distance between two adjacent first coils 211 in the first coil section 21, the distance between two adjacent second coils 221 in the second coil section 22, or the distance between adjacent first coils 211 and second coils 221 in the first coil section 21 and the second coil section 22. In some embodiments, W3 satisfies 0.5mm ≤ W3 ≤ 2mm, thereby improving the overall magnetic field strength of the near-field communication antenna 10. For example, W3 is 0.5mm, 1mm, 1.5mm, or 2mm.

[0078] In some embodiments of this disclosure, the width of the conductors of the first coil 211 and the second coil 221 is any value from 0.3 mm to 2 mm. For example, the conductor widths are 0.3 mm, 0.5 mm, 1 mm, 1.5 mm, and 2 mm. Generally, with other parameters remaining constant, the magnetic field distribution becomes more uniform as the conductor width increases; however, the overall impedance of the antenna body 2 also increases, leading to a decrease in magnetic field strength. To control the overall impedance of the antenna body 2 within a certain range, the conductor width of the coils in some embodiments of this disclosure is any value from 0.3 mm to 2 mm, so that the antenna body 2 has both the advantages of uniform magnetic field distribution and high magnetic field strength, thereby improving the card recognition effect.

[0079] In some embodiments, the width of the conductor is any value between 0.5 mm and 1 mm, which can improve the uniformity of the magnetic field distribution and the strength of the magnetic field. For example, the conductor width is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0080] It should be noted that conductors include, but are not limited to, round conductors (i.e., conductors with a circular cross-section), flat conductors (i.e., conductors with a flat cross-section), or other types of conductors. It can be understood that when the conductor is a round conductor, the width of the conductor is the diameter of the round conductor; when the conductor is a flat conductor, the width of the conductor is the width of the flat conductor's projection onto the third direction Z.

[0081] In some embodiments of this disclosure, as shown in Figures 1 and 3, the near-field communication antenna 10 further includes a cross-connection portion 23, which is configured to connect at least one of two adjacent first coils 211 in the first coil portion 21, two adjacent second coils 221 in the second coil portion 22, or adjacent first coils 211 and second coils 221 in the first coil portion 21 and the second coil portion 22. As shown in Figures 3 and 7, the substrate 1 includes a first surface 11 and a second surface 12 disposed opposite to each other in the thickness direction. The cross-connection portion 23 includes a first connecting line 231 and a second connecting line 232 intersecting in the thickness direction of the substrate 1, with the first connecting line 231 disposed on the first surface 11 and the second connecting line 232 disposed on the second surface 12, to connect at least one of two adjacent first coils 211 in the first coil portion 21, two adjacent second coils 221 in the second coil portion 22, or adjacent first coils 211 and second coils 221 in the first coil portion 21 and the second coil portion 22.

[0082] In some embodiments of this disclosure, by providing the cross-connection portion 23, on the one hand, as shown in FIG1, the cross-connection portion 23 can connect each coil to form a complete antenna circuit, so as to generate a stable magnetic field. On the other hand, it can make the antenna body 2 have a symmetrically distributed structure, thereby making the magnetic field of the antenna body 2 more uniformly distributed in all directions, which is beneficial to improving the stability and reliability of near-field communication.

[0083] In some embodiments, as shown in FIG3, when the cross connection portion 23 connects two adjacent coils in the first coil portion 21, that is, when the cross connection portion 23 connects two adjacent first coils 211, along the extending direction of the first coil 211, the first coil 211 includes a first connection end 2111 and a second connection end 2112 spaced apart. The first connection line 231 is 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 one of the two adjacent first coils 211. Similarly, the second connection line 232 is 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 one of the two adjacent first coils 211, thereby realizing the conduction of the two adjacent first coils 211.

[0084] In some embodiments, when the cross-connection portion 23 connects two adjacent coils in the second coil portion 22, that is, when the cross-connection portion 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 spaced apart. The first connecting line 231 is connected to the third connection end of one of the two adjacent second coils 221 and the fourth connection end of the other two adjacent second coils 221, respectively. Similarly, the second connecting line 232 is connected to the fourth connection end of one of the two adjacent second coils 221 and the third connection end of the other two adjacent second coils 221, thereby realizing the conduction of the two adjacent second coils 221. It should be noted that the structure of the cross-connection portion 23 connecting two adjacent coils in the second coil portion 22 can be adjusted with reference to FIG3.

[0085] In some embodiments, when the cross-connection portion 23 connects two adjacent coils in the first coil portion 21 and the second coil portion 22, that is, when the cross-connection portion 23 connects the adjacent first coil 211 and the second coil 221, the first connecting line 231 is connected to the first connecting end 2111 of the first coil 211 and the fourth connecting end of the second coil 221, respectively. Similarly, the second connecting line 232 is connected to the second connecting end 2112 of the first coil 211 and the third connecting 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 in some embodiments of this disclosure, the structure of the cross-connection portion 23 connecting two adjacent coils in the first coil portion 21 and the second coil portion 22 can be adjusted with reference to FIG3.

[0086] In some embodiments of this disclosure, as shown in FIG1, at least one of the first coil section 21, the second coil section 22, or the cross-connection section 23 has a symmetrical structure. For example, at least one of the first coil section 21, the second coil section 22, or the cross-connection section 23 is symmetrical in both the first direction X and the second direction Y. This allows the magnetic field of the entire antenna body 2 to be more uniformly distributed in all directions, thereby improving the stability and reliability of near-field communication and improving the card recognition effect. As shown in FIG6, the return 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 some embodiments of this disclosure has good symmetry performance, thereby meeting the requirements of electromagnetic compatibility. Furthermore, as shown in FIG6, when the frequency of the antenna body 2 is 13.56MHz, the return loss of the antenna body 2 reaches -64.049dB, indicating that the feed line and the antenna body 2 achieve a good matching degree at this time, thereby improving the radiation efficiency of the antenna body 2 and improving the card recognition accuracy.

[0087] Based on the application of the near-field communication antenna 10 of some embodiments of this disclosure in the wireless charging device 100, some embodiments are provided.

[0088] In some embodiments, the first coil section 21 has two turns, and the outermost coil of the first coil section 21 has a length L1 of 80 mm and a width W1 of 40 mm. The second coil section 22 has one turn, and the outermost coil of the second coil section 22 has a length L2 of 63 mm and a width W2 of 10 mm. The spacing W3 between two adjacent first coils 211 in the first coil section 21, between two adjacent second coils 221 in the second coil section 22, and between adjacent first coils 211 and second coils 221 in the first coil section 21 and the second coil section 22 is 0.3 mm. The width of the wires of the first coils 211 and the second coils 221 is 0.3 mm. Upon detection, the recognition area of ​​the near-field communication antenna 10 is 85 × 45 mm. 2 When the detection current is met, the card recognition success rate is 98%, and the card protection success rate is 98%.

[0089] In some embodiments, the first coil section 21 has 6 turns, and the outermost coil of the first coil section 21 has a length L1 of 150 mm and a width W1 of 100 mm. The second coil section 22 has 3 turns, and the outermost coil of the second coil section 22 has a length L2 of 133 mm and a width W2 of 30 mm. The spacing W3 between two adjacent first coils 211 in the first coil section 21, the spacing between two adjacent second coils 221 in the second coil section 22, and the spacing W3 between adjacent first coils 211 and second coils 221 in the first coil section 21 and the second coil section 22 is 3 mm. The width of the wires of the first coils 211 and the second coils 221 is 2 mm. The detection area of ​​the near-field communication antenna 10 is 155 × 105 mm. 2 When the detection current is met, the card recognition success rate is 80%, and the card protection success rate is 75%.

[0090] In some embodiments, the first coil section 21 has 4 turns, and the outermost coil of the first coil section 21 has a length L1 of 110 mm and a width W1 of 60 mm. The second coil section 22 has 2 turns, and the outermost coil of the second coil section 22 has a length L2 of 93 mm and a width W2 of 20 mm. The spacing W3 between two adjacent first coils 211 in the first coil section 21, the spacing between two adjacent second coils 221 in the second coil section 22, and the spacing W3 between adjacent first coils 211 and second coils 221 in the first coil section 21 and the second coil section 22 is 1 mm. The width of the wires of the first coils 211 and the second coils 221 is 0.5 mm. The detection area of ​​the near-field communication antenna 10 is 115 × 65 mm. 2 When the detection current is met, the card recognition success rate is 98%, and the card protection success rate is 95%.

[0091] In some embodiments, the first coil section 21 has 4 turns, and the outermost coil of the first coil section 21 has a length L1 of 130 mm and a width W1 of 85 mm. The second coil section 22 has 1 turn, and the outermost coil of the second coil section 22 has a length L2 of 113 mm and a width W2 of 26 mm. The spacing W3 between two adjacent first coils 211 in the first coil section 21, the spacing between two adjacent second coils 221 in the second coil section 22, and the spacing W3 between adjacent first coils 211 and second coils 221 in the first coil section 21 and the second coil section 22 is 2 mm. The width of the wires of the first coils 211 and the second coils 221 is 1 mm. The detection area of ​​the near-field communication antenna 10 is 135 × 90 mm. 2 When the detection current is met, the card recognition success rate is 80%, and the card protection success rate is 90%.

[0092] In some embodiments, the first coil section 21 has 4 turns, and the outermost coil of the first coil section 21 has a length L1 of 120 mm and a width W1 of 70 mm. The second coil section 22 has 1 turn, and the outermost coil of the second coil section 22 has a length L2 of 103 mm and a width W2 of 23 mm. The spacing W3 between two adjacent first coils 211 in the first coil section 21, the spacing between two adjacent second coils 221 in the second coil section 22, and the spacing W3 between adjacent first coils 211 and second coils 221 in the first coil section 21 and the second coil section 22 is 1.5 mm. The width of the wires of the first coils 211 and the second coils 221 is 0.8 mm. The detection area of ​​the near-field communication antenna 10 is 125 × 75 mm. 2 Under the condition that the detection current is met, the card recognition success rate is 95%, and the card protection success rate is 95%.

[0093] In summary, the near-field communication antenna 10 provided in some embodiments of this disclosure has at least the following advantages:

[0094] In some embodiments of this disclosure, a first coil portion 21 and a second coil portion 22 located inside the first coil portion 21 are provided, with the ratio of the external dimensions of the first coil portion 21 to the external dimensions of the second coil portion 22 being any value between 2 and 2.5, and the ratio of the internal dimensions of the first coil portion 21 to the external dimensions of the second coil portion 22 being any value between 1.5 and 2. In this way, the externally located first coil portion 21 can enhance the magnetic field strength in the edge region of the near-field communication antenna 10, eliminating interference from the external environment, while the internally located second coil portion 22 can enhance the magnetic field strength in the central region of the near-field communication antenna 10. 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 10 can be made uniform and the magnetic field strength larger, thereby effectively identifying the presence of a card.

[0095] Referring to FIG7, a schematic diagram of the structure of a wireless charging device 100 according to some embodiments is shown. As shown in FIG7, some embodiments of this disclosure also provide a wireless charging device 100, which includes a wireless charging coil 4 and the aforementioned near-field communication antenna 10, wherein the near-field communication antenna 10 and the wireless charging coil 4 are spaced apart. In some embodiments, the wireless charging coil 4 and the near-field communication antenna 10 are spaced apart along a third direction Z, that is, along the thickness direction of the substrate 1 of the near-field communication antenna 10.

[0096] It should be noted that the structure of the near-field communication antenna 10 in some embodiments of this disclosure is the same as that of the near-field communication antenna 10 described above, and its beneficial effects are also similar, so it will not be described in detail here.

[0097] In some embodiments of this disclosure, the distance between the near-field communication antenna 10 and the wireless charging coil 4 is any value between 1.3 mm and 1.5 mm. That is, the distance between the near-field communication antenna 10 and the wireless charging coil 4 along the third direction Z is any value between 1.3 mm and 1.5 mm. For example, the distance between them is 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, or 1.5 mm. By controlling the distance between the near-field communication antenna 10 and the wireless charging coil 4, electromagnetic interference between them can be reduced, improving the card recognition accuracy.

[0098] It should be noted that the distance between the near-field communication antenna 10 and the wireless charging coil 4 here actually refers to the distance between the antenna body 2 of the near-field communication antenna 10 and the wireless charging coil 4. In practical applications, the antenna body 2 of the near-field communication antenna 10 is usually disposed on the surface of the substrate 1 facing away from the wireless charging coil 4. Therefore, the distance between the near-field communication antenna 10 and the wireless charging coil 4 here includes the thickness of the substrate 1.

[0099] In some embodiments of this disclosure, the near-field communication antenna 10 at least covers the wireless charging coil 4. This effectively protects the card placed in the charging area, preventing damage from the high power generated by the wireless charging coil 4 during operation of the wireless charging device 100. In some embodiments, the projection of the near-field communication antenna 10 onto a plane perpendicular to the third direction Z at least covers the projection of the wireless charging coil 4 onto a plane perpendicular to the third direction Z.

[0100] In some embodiments of this disclosure, the wireless charging device 100 further includes a power supply module, wherein the first coil portion 21 includes at least one first coil 211, and the outermost first coil 211 is connected to the power supply module. Thus, by connecting the outermost first coil 211 to the power supply module, a continuous and stable current can be provided to the antenna body 2 to generate a stable magnetic field. In some embodiments, the outermost first coil 211 includes an input terminal and an output terminal, which are electrically connected to the positive and negative terminals of the external power supply module, respectively.

[0101] In some embodiments of this disclosure, the wireless charging device 100 further includes a metal housing 3, with at least a portion of the near-field communication antenna 10 and the wireless charging coil 4 disposed within the metal housing 3. The metal housing 3 has a mounting cavity with an opening, and the near-field communication antenna 10 and the wireless charging coil 4 are disposed within the mounting cavity, with the near-field communication antenna 10 positioned close to the opening of the mounting cavity. For example, the opening is located at one end of the mounting cavity along a third direction Z.

[0102] In some embodiments of this disclosure, by placing at least a portion of the near-field communication antenna 10 and the wireless charging coil 4 inside the metal housing 3, the near-field communication antenna 10 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 10.

[0103] In some embodiments of this disclosure, the wireless charging device 100 also includes a cover plate that covers the opening. This protects the near-field communication antenna 10 and helps to extend its service life.

[0104] As shown in Figure 8, some embodiments of this disclosure also provide a wireless charging system 200, including a controller 300 and the aforementioned wireless charging device 100. The controller 300 is connected to a near-field communication antenna 10 and a wireless charging coil 4. The near-field communication antenna 10 is configured to acquire the identification signal of a target object (such as a card). The wireless charging coil 4 is configured to charge the device to be charged. The controller 300 is configured to control the opening and closing of the wireless charging coil 4 based on the identification signal and issue 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 damage caused by the wireless charging coil 4 during operation, thereby effectively protecting the target object. By issuing an alarm message, the user can be reminded to remove the card in time to ensure the charging of the device to be charged.

[0105] In some embodiments, when the target object is placed on the wireless charging device 100 before the device to be charged, or when the target object and the device to be charged are placed on the wireless charging device 100 simultaneously, the controller 300 may control the wireless charging coil 4 to remain off and issue an alarm message. When the device to be charged is placed on the wireless charging device 100 before the target object, the controller 300 may control the wireless charging coil 4 to be off and issue an alarm message.

[0106] It should be noted that in some embodiments of this disclosure, the structure of the wireless charging device 100 is the same as that of the wireless charging device 100 described above, and its beneficial effects are also similar, so they will not be described in detail here.

[0107] As shown in Figure 9, some embodiments of this disclosure also provide a vehicle 1000, which includes the wireless charging system 200 described above.

[0108] It should be noted that in some embodiments of this disclosure, the structure of the wireless charging system 200 is the same as that of the wireless charging system 200 described above, and its beneficial effects are also similar, so they will not be described in detail here.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A near-field communication antenna (10), comprising: A first coil section (21) and a second coil section (22), wherein the first coil section (21) is disposed circumferentially on the second coil section (22) and connected to the second coil section (22); The ratio of the external dimension of the first coil part (21) to the external dimension of the second coil part (22) is any value between 2 and 2.5, and the ratio of the internal dimension of the first coil part (21) to the external dimension of the second coil part (22) is any value between 1.5 and 2.

2. The near-field communication antenna (10) according to claim 1, wherein, The ratio of the external dimension of the first coil part (21) to the internal dimension of the second coil part (22) is any value between 2.2 and 2.8, and the ratio of the internal dimension of the first coil part (21) to the internal dimension of the second coil part (22) is any value between 1.8 and 2.

2.

3. The near-field communication antenna (10) according to claim 1 or 2, wherein, The number of coils in the first coil section (21) is greater than the number of coils in the second coil section (22).

4. The near-field communication antenna (10) according to claim 3, wherein, The number of coils in the first coil section (21) is A, and the number of coils in the second coil section (22) is B, satisfying: A:B = (2~4):1, and A and B are both positive integers.

5. The near-field communication antenna (10) according to claim 4, wherein, The number of coils A in the first coil section (21) satisfies: 2 turns ≤ A ≤ 6 turns.

6. The near-field communication antenna (10) according to claim 4 or 5, wherein, The number of coils B in the second coil section (22) satisfies: 1 turn ≤ B ≤ 3 turns.

7. The near-field communication antenna (10) according to any one of claims 1-6, wherein, The first coil section (21) includes at least one first coil (211), the at least one first coil (211) being rectangular; Wherein, the length of the outermost first coil (211) in the at least one first coil (211) is L1, and the width of the outermost first coil (211) in the at least one first coil (211) is W1, and satisfies: W1:L1=1:(1~3).

8. The near-field communication antenna (10) according to any one of claims 1-6, wherein the length L1 of the outermost first coil (211) satisfies: 80mm≤L1≤150mm, and the width W1 of the outermost first coil (211) satisfies: 40mm≤W1≤100mm.

9. The near-field communication antenna (10) according to any one of claims 1-8, wherein, The second coil section (22) includes: at least one second coil (221), the at least one second coil (221) being rectangular; Wherein, the length of the outermost second coil (221) in the at least one second coil (221) is L2, and the width of the outermost second coil (221) in the at least one second coil (221) is W2, and satisfies: W2:L2=1:(2~4).

10. The near-field communication antenna (10) according to any one of claims 1-6, wherein, The length L2 of the outermost second coil (221) satisfies: 63mm≤L2≤133mm, and the width W2 of the outermost second coil (221) satisfies: 10mm≤W2≤30mm.

11. The near-field communication antenna (10) according to any one of claims 1-10, wherein, The distance between two adjacent first coils (211) in the first coil section (21), the distance between two adjacent second coils (221) in the second coil section (22), or the distance between adjacent first coils (211) and second coils (221) in the first coil section (21) and the second coil section (22) is W3, and satisfies 0.3mm≤W3≤3mm.

12. The near-field communication antenna (10) according to any one of claims 1-11, wherein, The width of the wire of the first coil (211) of the first coil section (21) is any value between 0.3 mm and 2 mm; the width of the wire of the second coil (221) of the second coil section (22) is any value between 0.3 mm and 2 mm.

13. The near-field communication antenna (10) according to any one of claims 1-12, further comprising: A substrate (1) is provided on the surface of the substrate (1), wherein the first coil portion (21) and the second coil portion (22) are disposed.

14. The near-field communication antenna (10) according to claim 13, wherein, The thickness of the substrate (1) is 0.5 mm to 1 mm.

15. The near-field communication antenna (10) according to claim 13 or 14 further includes a cross-connection portion (23), said cross-connection portion (23) being configured to connect at least one of two adjacent first coils (211) in the first coil portion (21), two adjacent second coils (221) in the second coil portion (22), or adjacent first coils (211) and second coils (221) in the first coil portion (21) and the second coil portion (22).

16. The near-field communication antenna (10) according to claim 15, wherein, The substrate (1) includes a first surface (11) and a second surface (12) disposed opposite to each other along the thickness direction; The cross connection portion (23) includes a first connecting line (231) and a second connecting line (232) that are intersected in the thickness direction of the substrate (1), and the first connecting line (231) is disposed on the first surface (11), and the second connecting line (232) is disposed on the second surface (12) to connect at least one of two adjacent first coils (211) in the first coil portion (21), two adjacent second coils (221) in the second coil portion (22), or adjacent first coils (211) and second coils (221) in the first coil portion (21) and the second coil portion (22).

17. The near-field communication antenna (10) according to claim 15 or 16, wherein, At least one of the first coil section (21), the second coil section (22), or the cross connection section (23) is a symmetrical structure.

18. A wireless charging device (100), comprising: The wireless charging coil (4) and the near-field communication antenna (10) according to any one of claims 1-17 are arranged at a distance from the wireless charging coil (4).

19. The wireless charging device (100) according to claim 18, wherein, The distance between the near-field communication antenna (10) and the wireless charging coil (4) is any value between 1.3 mm and 1.5 mm.

20. The wireless charging device (100) according to claim 18 or 19, wherein, The near-field communication antenna (10) at least covers the wireless charging coil (4).

21. The wireless charging device (100) according to any one of claims 18-20, further comprising: Power supply module; The first coil section (21) includes at least one first coil (211), and the outermost first coil (211) of the at least one first coil (211) is connected to the power supply module.

22. The wireless charging device (100) according to any one of claims 18-21, further comprising: The near-field communication antenna (10) and the wireless charging coil (4) are disposed within the metal housing.

23. The wireless charging device (100) according to claim 22, wherein, The metal housing is provided with an opening in the mounting cavity; The near-field communication antenna (10) and the wireless charging coil (4) are disposed in the mounting cavity, and the near-field communication antenna (10) is disposed close to the opening of the mounting cavity.

24. The wireless charging device (100) according to claim 23 further includes a cover plate covering the opening.

25. A wireless charging system (200), comprising: The controller (300) and the wireless charging device (100) according to any one of claims 18-24 are respectively connected to the near-field communication antenna (10) and the wireless charging coil (4). The near-field communication antenna (10) is configured to acquire the identification signal of the target object. The wireless charging coil (4) is configured to charge the device to be charged. The controller (300) is configured to control the opening and closing of the wireless charging coil (4) and issue an alarm message based on the identification signal.

26. The wireless charging system (200) according to claim 25, wherein, If the target object is placed on the wireless charging device (100) before the device to be charged, or if the target object and the device to be charged are placed on the wireless charging device (100) at the same time, the controller (300) may control the wireless charging coil (4) to remain off and issue an alarm message.

27. The wireless charging system (200) according to claim 25, wherein, If the device to be charged is placed on the wireless charging device (100) before the target object, the controller (300) can control the wireless charging coil (4) to turn off and issue an alarm message.

28. A vehicle (1000) comprising a wireless charging system (200) according to any one of claims 25-27, or comprising a wireless charging device (100) according to any one of claims 18-24, or comprising a near-field communication antenna (10) according to any one of claims 1-17.

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