Wearable NFC integrated device and control circuit thereof

Abstract

The invention provides a wearable NFC integrated ring and a control circuit thereof, and belongs to the field of wearable equipment.The wearable NFC integrated ring comprises a ring body, an antenna coil and a control chip, a containing cavity is formed in the ring body, the antenna coil and the control chip are both arranged in the containing cavity, the antenna coil is electrically connected with the control chip, an opening is further formed in the side wall of the ring body and communicated with the containing cavity, and the control chip is electrically connected with the control chip; the opening is used for ensuring that at least part of the antenna coil is exposed. According to the NFC ring, the control chip and the antenna coil are arranged in the ring body, so that the technical effect of further improving the aesthetic property of the NFC ring under the condition of reducing the size of the NFC ring is achieved, secondly, the opening is formed in the ring body, so that the opening can ensure that at least part of the antenna coil is exposed outside, and the NFC ring is more attractive. The ring body made of the metal material can be effectively prevented from shielding the signal of the antenna coil. And the filling piece made of the graphene composite material is also arranged in the opening, so that the signal receiving and transmitting efficiency is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of wearable devices, and in particular to a wearable NFC integrated device and a control circuit thereof. Background Art

[0002] Existing near field communication (NFC) technology is mainly used in devices such as cards or smartphones, which have limitations in portability and ease of use. There is a technical need in the art to develop a wearable device with integrated NFC function, which should be compact, easy to use in daily life, and can optimize the convenience of personal carrying of items.

[0003] In order to achieve NFC communication, NFC antennas are indispensable in electronic devices. However, traditional electric coil antennas are large in area, occupying valuable space and increasing the complexity of antenna design. Integrating antenna coils, NFC chips and matching circuits into a small space faces many challenges, especially as the size of devices decreases. How to integrate more functional components in a limited space has become a major problem in designing the next generation of electronic products. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present application provides a wearable NFC integrated ring and a control circuit thereof. The wearable NFC integrated ring, by setting a control chip inside the ring body, achieves the technical effect of further improving the aesthetics of the NFC ring while reducing the volume of the NFC ring.

[0005] In a first aspect, an embodiment of the present application provides a wearable NFC integrated ring, comprising a ring body, an antenna coil and a control chip, wherein the ring body is made of a metal material, a receiving cavity is provided in the ring body, the antenna coil and the control chip are both placed in the receiving cavity, the antenna coil is electrically connected to the control chip, and an opening is further provided on the side wall of the ring body, the opening is connected to the receiving cavity, and the opening is used to ensure that at least part of the antenna coil is exposed to the outside.

[0006] In the technical solution of the embodiment of the present application, by arranging the control chip and the antenna coil inside the ring body, the technical effect of further improving the aesthetics of the NFC ring while reducing the volume of the NFC ring is achieved. Secondly, by arranging an opening on the ring body, the opening can ensure that at least part of the antenna coil is exposed to the outside, which can effectively prevent the ring body made of metal material from shielding the signal of the antenna coil, thereby allowing the signal to propagate freely.

[0007] In some embodiments, a filling piece is further included, and the filling piece is made of a non-metallic material and is placed in the opening.

[0008] In this embodiment, the opening on the ring body is filled with a filler made of a non-metallic material, so that the aesthetics and durability of the ring are guaranteed without affecting the propagation of the antenna coil signal.

[0009] In some embodiments, the filler is made of a graphene composite material obtained by mixing graphene nanosheets with a polyimide matrix material.

[0010] In this embodiment, by filling the opening of the ring body with a filler made of graphene composite materials, the NFC ring can more effectively transmit NFC signals while maintaining its structural integrity, thereby improving the communication efficiency of the device and the user experience.

[0011] In some embodiments, the mixing ratio of the graphene nanosheets to the polyimide matrix material is 5:95 (by mass).

[0012] In this embodiment, by adjusting the mixing ratio of the graphene nanosheets and the polyimide matrix material in the graphene composite material, the dielectric properties of the graphene composite material are optimized while ensuring the mechanical properties of the graphene composite material, so that the composite material has a lower loss tangent in the 13.56 MHz frequency band, thereby improving the signal transmission efficiency.

[0013] In some embodiments, a slot for fixing the antenna coil is further provided in the accommodating cavity. The slot is in a spiral structure and is coaxially arranged with the ring body. The antenna coil is wound around the ring body through the slot.

[0014] In this embodiment, by providing a slot for fixing the antenna coil in the accommodating cavity, not only can the antenna coil be more firmly fixed in the accommodating cavity, but also the path of the spiral slot can be optimized to adjust the pitch, number of turns and other parameters of the antenna coil after the antenna coil is wound around the ring body.

[0015] In some embodiments, the antenna coil satisfies the following formula:

[0016]

[0017] Where L is the expected value of the antenna coil, N is the number of turns of the antenna coil, μ0 is the vacuum magnetic permeability of the antenna coil, and μ r is the relative magnetic permeability of the antenna coil material, D is the inner diameter of the antenna coil, W is the wire diameter of the antenna coil, H is the coil height of the antenna coil, and P is the pitch of the antenna coil.

[0018] In this embodiment, the parameter data such as the number of turns, wire diameter, coil height and pitch of the antenna coil can be determined by an intuitive estimation method using the above formula, thereby making it more convenient to design the slot path.

[0019] In some embodiments, the expected value of the antenna coil is 2-5 μH (microhenry).

[0020] In this embodiment, by setting the number of turns, pitch, inner diameter and other parameters of the antenna coil, the expected value of the inductance of the antenna coil is set to 2-5 μH, thereby ensuring the reliability of the antenna coil in use.

[0021] In some embodiments, a flexible circuit board is further included, the control chip is disposed on the flexible circuit board, and the control chip is connected to the antenna coil through the flexible circuit board.

[0022] In this embodiment, the control chip and its supporting circuit can be accommodated in the accommodating cavity through the flexible circuit board, and fit with the surface of the ring body, thereby ensuring the smoothness of the surface of the ring body.

[0023] In a second aspect, an embodiment of the present application provides a control circuit for a wearable NFC integrated ring, which is applied to the wearable NFC integrated ring described in any one of claims 1 to 8, and includes an NFC control chip, a signal receiving module, an LC low-pass filter circuit, a matching circuit and an antenna coil circuit, wherein the signal receiving module is electrically connected to the NFC control chip, and the signal receiving module is used to receive signals and transmit the signals to the NFC control chip; the LC low-pass filter circuit is electrically connected to the NFC control chip, and is used to filter out the high-frequency signal emitted by the NFC control chip; the matching circuit is arranged between the LC low-pass filter circuit and the antenna coil circuit, and is used to adjust the resonant frequency of the antenna coil circuit.

[0024] In the technical solution of the embodiment of the present application, a passive circuit design is adopted to reduce the complexity of the control circuit, thereby reducing the volume of the control circuit, so that the control circuit can be placed in a narrow accommodation cavity for use.

[0025] In some embodiments, the signal of the NFC control chip is NXP-CLRC663.

[0026] In this embodiment, by selecting small-sized micro components, the volume of the control circuit is further reduced, so that the control circuit can be more suitable for use in a narrow accommodation cavity.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a schematic diagram of the structure of a wearable NFC integrated ring in an embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the internal structure of a wearable NFC integrated ring in an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the structure of the internal control chip part of the wearable NFC integrated ring in the embodiment of the present application;

[0032] Figure 4 A circuit diagram of a control circuit for a wearable NFC integrated ring in an embodiment of the present application

[0033] Figure 5 This is a graph showing the dielectric parameter test results of the graphene composite material at the 13.56 MHz NFC frequency band in the embodiment of the present application;

[0034] Figure 6 This is a loss tangent detection diagram of the graphene composite material in the 13.56 MHz NFC frequency band in the embodiment of the present application;

[0035] Figure 7 This is a diagram showing the shielding effectiveness of the graphene composite material under the 13.56 MHz NFC frequency band in the embodiment of the present application;

[0036] Figure 8 This is a signal attenuation detection diagram of the graphene composite material under the 13.56 MHz NFC frequency band in the embodiment of the present application;

[0037] Fig. 9 This is a reflection coefficient detection diagram of the graphene composite material under the 13.56 MHz NFC frequency band in the embodiment of the present application.

[0038] Description of reference numerals:

[0039] 1. Ring body; 2. Antenna coil; 3. Control chip; 4. Opening; 5. Filling piece; 6. Card slot; 7. Flexible circuit board;

[0040] 11. Matching circuit; 12. Antenna coil circuit; 13. Signal receiving module; 14. LC low-pass filter circuit. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] NFC near-field communication technology is a contactless radio frequency identification technology based on RFID (radio frequency identification). It has evolved from the integration of interconnection technology. It combines the functions of inductive card reader, inductive card and point-to-point on a single chip to identify and exchange data with corresponding devices within a short distance.

[0050] Existing NFC technology is mainly used in devices such as cards or smart phones, which have limitations in portability and ease of use. Rings, as a common decorative item, are not only highly portable, but also beautiful in appearance and are deeply loved by people. Therefore, NFC smart rings have become one of the main development directions in the NFC wearable device market. Most of the existing NFC smart rings have NFC communication chips fixed in the ring base, and then the decorations are fixed on the top of the ring base by spot welding, thereby covering the NFC communication chip. However, the above-mentioned NFC ring embeds the NFC chip in the base. Although it can ensure the stability of NFC communication, the ring is large in size, and the base on the ring greatly affects the overall aesthetics of the ring. Therefore, a new type of wearable NFC integrated ring is urgently needed to further improve the aesthetics of the NFC ring while reducing the size of the NFC ring.

[0051] In order to solve the technical problem of how to provide a new type of wearable NFC integrated ring so as to further improve the aesthetics of the NFC ring while reducing the volume of the NFC ring, the present application provides a wearable NFC integrated ring. By setting the control chip 3 inside the ring body 1, the technical effect of further improving the aesthetics of the NFC ring while reducing the volume of the NFC ring is achieved.

[0052] Please refer to Figure 1 , Figure 1 2 is a schematic diagram of the structure of a wearable NFC integrated ring provided in an embodiment of the present application. The wearable NFC integrated ring includes a ring body 1, an antenna coil 2 and a control chip 3. The ring body 1 is made of metal material, and a receiving cavity is provided in the ring body 1. The antenna coil 2 and the control chip 3 are both placed in the receiving cavity. The antenna coil 2 is electrically connected to the control chip 3. The side wall of the ring body 1 is also provided with an opening 4, which is connected to the receiving cavity. The opening 4 is used to ensure that at least part of the antenna coil 2 is exposed to the outside. In this embodiment, the control chip 3 and the antenna coil 2 are arranged inside the ring body 1, and there is no need to additionally arrange a base on the surface of the ring body 1, thereby greatly improving the overall aesthetics of the ring. Secondly, in this embodiment, the ring body 1 is made of metal material. As is well known, in When making metal rings, aluminum, iron, copper, silver, gold and other metals are often used. These metal materials all have a good metallic luster, so rings made of aluminum, iron, copper, silver, gold and other metals have a more beautiful appearance. However, aluminum, iron, copper, silver, gold and other metals all have good electrical conductivity. Therefore, when the antenna coil 2 is set in the ring body 1 made of the above-mentioned aluminum, iron, copper, silver, gold and other metals with good electrical conductivity, the ring body 1 made of metal material will shield the signal of the antenna coil 2. Therefore, in order to solve the problem that the ring body 1 made of metal material will shield the signal of the antenna coil 2, in an embodiment of the present application, an opening 4 is set on the ring body 1, so that the opening 4 can ensure that at least part of the antenna coil 2 is exposed to the outside, so as to allow the signal to propagate freely.

[0053] Furthermore, in an embodiment of the present application, the wearable NFC integrated ring also includes a filling piece 5, which is made of a non-metallic material. The filling piece 5 is placed in the opening 4. In this embodiment, a filling piece made of a non-metallic material is used to fill the opening 4 on the ring body 1, so as to ensure the aesthetics and durability of the ring without affecting the signal propagation of the antenna coil 2.

[0054] Furthermore, in an embodiment of the present application, the filling piece is made of a graphene composite material obtained by mixing graphene nanosheets and a polyimide matrix material; the graphene composite material not only has excellent electromagnetic wave absorption performance, but also can enhance the transmission of NFC signals. Therefore, in this embodiment, the filling piece made of the graphene composite material is filled in the opening 4 of the ring body 1, so that the NFC ring can transmit NFC signals more effectively while maintaining its structural integrity, thereby improving the communication efficiency of the device and user experience.

[0055] Specifically, the graphene composite material is prepared as follows:

[0056] Prepare graphene nanosheets, evenly disperse the graphene nanosheets in a polymer matrix to form a composite material with high conductivity and excellent electromagnetic wave absorption performance. High-quality graphene nanosheets are obtained by chemical vapor deposition, mechanical exfoliation or liquid phase exfoliation;

[0057] b. Select a suitable polymer matrix, such as polyimide, polytetrafluoroethylene, polyacrylate, etc., and determine the matrix material according to the application requirements. In this embodiment, a polyimide polymer matrix is ​​preferred;

[0058] c. mixing the graphene nanosheets with the polymer matrix, and uniformly dispersing the graphene nanosheets in the polymer matrix by solution mixing, melt mixing or in-situ polymerization;

[0059] d. Optimize the electromagnetic and mechanical properties of composite materials by controlling the mixing ratio, dispersion process and curing conditions;

[0060] e. The final graphene-based composite material has good plasticity and can be processed into different shapes and sizes as needed to meet the specific requirements of the NFC ring opening 4 parts.

[0061] In this embodiment, graphene nanosheets are used as reinforcing materials to provide excellent electromagnetic wave absorption performance; and the polymer matrix selects polyimide (PI) as the matrix material, which can greatly enhance the mechanical properties of the filler due to its good heat resistance and mechanical properties.

[0062] Further, in the embodiment of the present application, in mixing the graphene nanosheets with the polyimide matrix material, the mixing ratio of the graphene nanosheets to the polyimide matrix material is 5:95 (by mass). In this embodiment, the graphene composite material with a mixing ratio of the graphene nanosheets to the polyimide matrix material of 5:95 (by mass) is used so that the filler has excellent dielectric properties and a small signal attenuation effect, further improving the signal transmission efficiency of the NFC ring.

[0063] Specifically, in the implementation of this application, various properties of the NFC ring using the above graphene composite material were tested at the 13.56 MHz NFC frequency band, and the specific results are as follows:

[0064] like Figure 5 As shown, Figure 5 The dielectric parameter test results of graphene composite materials in the 13.56MHz NFC frequency band are shown in the figure. It is not difficult to see from the figure that the dielectric constant (Dk) fluctuates slightly in the frequency range near 13.56MHz, and the average value is about 3.2, which shows that the dielectric properties of graphene-based composite materials are relatively stable. The fluctuation range of ±0.1 shows that the dielectric properties of the material have a certain consistency.

[0065] like Figure 6 As shown, Figure 6 This is the loss tangent test diagram of the graphene composite material in the 13.56MHz NFC frequency band. It can be seen from the figure that the loss tangent (Df) also maintains a low and relatively stable value near 13.56MHz, with an average value of about 0.003. This shows that the composite material has a small electromagnetic energy loss in the NFC frequency band and is suitable as an NFC application material.

[0066] like Figure 7 As shown, Figure 7 This is the shielding effectiveness test diagram of graphene composite materials under the 13.56MHz NFC frequency band. Figure 7 It can be seen that the shielding effectiveness (SE) remains at a constant value of 20 dB, indicating that the graphene-based composite material can effectively shield external electromagnetic interference and provide good electromagnetic compatibility for NFC devices.

[0067] like Figure 8 As shown, Figure 8 This is the signal attenuation detection diagram of graphene composite materials under the 13.56MHz NFC frequency band. Figure 8 It can be seen that the signal attenuation remains at a constant value of 5dB, which means that the composite material has less attenuation effect on the NFC signal, helping to maintain the signal integrity and communication quality.

[0068] like Fig. 9 As shown, Fig. 9 This is the reflection coefficient detection diagram of graphene composite materials under the 13.56MHz NFC frequency band. Fig. 9 It can be seen that the reflection coefficient remains at a constant value of 0.1, indicating that the impedance matching between the composite material and the NFC reader is good, which reduces the reflection of the signal and improves the transmission efficiency of the signal.

[0069] In summary, in this embodiment, the mixing ratio of graphene nanosheets and polyimide matrix material in the graphene composite material is optimized, and then the dielectric properties of the graphene composite material are optimized, so that the composite material has a lower loss tangent in the 13.56 MHz frequency band, thereby improving the signal transmission efficiency.

[0070] For further information, please refer to Figure 2 In the embodiment of the present application, a slot 6 for fixing the antenna coil 2 is further provided in the accommodating cavity. The slot 6 has a spiral structure and is coaxially arranged with the ring body 1. The antenna coil 2 is wound on the ring body 1 through the slot, which not only enables the antenna coil 2 to be more firmly fixed in the accommodating cavity, but also can optimize the path of the spiral slot, so as to adjust the pitch, number of turns and other parameters of the antenna coil 2 after the antenna coil 2 is wound on the ring body 1.

[0071] In this embodiment, after the antenna coil 2 is placed in the slot, the antenna coil 2 fits the side wall of the slot, so in this case, the slot can be designed according to various parameter information of the antenna coil 2. In order to improve the transmission efficiency of the antenna coil 2 signal, the antenna coil 2 should satisfy the following formula:

[0072]

[0073] Where L is the expected value of the inductance of the antenna coil 2, N is the number of turns of the antenna coil 2, μ0 is the vacuum magnetic permeability of the material of the antenna coil 2, and μ r is the relative magnetic permeability of the material of the antenna coil 2 , D is the inner diameter of the antenna coil 2 , W is the wire diameter of the antenna coil 2 , H is the coil height of the antenna coil 2 , and P is the pitch of the antenna coil 2 .

[0074] Specifically, since the antenna coil 2 is wound around the ring body 1, and the size parameters of the ring body 1 will directly affect the parameter setting of the antenna coil 2, before setting the specific parameters of the antenna coil 2, it is necessary to first select the size of the ring body 1, and then determine the inner diameter of the antenna coil 2 according to the size parameters of the ring body 1. After determining the size parameters of the ring body 1, it is also necessary to determine the material of the antenna coil 2. The material of the antenna coil 2 is mainly copper, aluminum or stainless steel and other metal materials with good electrical conductivity. Therefore, the vacuum magnetic permeability μ0 of the antenna coil 2 material and the relative magnetic permeability μ r It can be determined by the material of the antenna coil 2. After determining the size of the ring body 1 and the material of the antenna coil 2, set the expected value L of the antenna coil 2, and then determine the number of turns, wire diameter, coil height and pitch of the antenna coil 2 by estimation according to the above formula.

[0075] Furthermore, in the embodiment of the present application, the expected inductance value of the antenna coil 2 is 2-5μH. By setting the number of turns, pitch, inner diameter and other parameters of the antenna coil 2, the expected inductance value of the antenna coil 2 is 2-5μH, thereby ensuring the reliability of the antenna coil 2 during use.

[0076] For further information, please refer to Figure 3 In the embodiment of the present application, a flexible circuit board 7 is also included. The control chip 3 is arranged on the flexible circuit board. The control chip 3 is connected to the antenna coil 2 through the flexible circuit board. In the present embodiment, the control chip 3 and its supporting circuit can be accommodated in the accommodating cavity through the flexible circuit board, and fit with the surface of the ring body 1, thereby ensuring the smoothness of the surface of the ring body 1.

[0077] Second, please refer to Figure 4 , Figure 4 A circuit diagram of a control circuit for a wearable NFC integrated ring provided in an embodiment of the present application is applied to any of the above-mentioned wearable NFC integrated rings, including an NFC control chip, a signal receiving module 13, an LC low-pass filter circuit 14, a matching circuit 11 and an antenna coil circuit 12, wherein the signal receiving module is electrically connected to the NFC control chip, and the signal receiving module is used to receive signals and transmit the signals to the NFC control chip; the LC low-pass filter circuit is electrically connected to the NFC control chip, and is used to filter out the high-frequency signal emitted by the NFC control chip; the matching circuit is arranged between the LC low-pass filter circuit and the antenna coil circuit, and is used to adjust the resonant frequency of the antenna coil circuit. In this embodiment, the passive circuit design is adopted to reduce the complexity of the control circuit, thereby reducing the volume of the control circuit, so that the control circuit can be placed in a narrow accommodation cavity for use.

[0078] Furthermore, in the embodiment of the present application, the signal of the NFC control chip is NXP-CLRC663, which is a small-sized micro component. In the present embodiment, by selecting a small-sized micro component, the volume of the control circuit is further reduced, so that the control circuit can be more suitable for use in a narrow accommodation cavity.

[0079] Furthermore, in the embodiment of the present application, the inductor, capacitor and resistor in the control circuit can be selected from the following types of components:

[0080] model model size Micro Chip Capacitors 01005 0.40×0.20×0.22mm Micro Chip Inductors 01005 0.40×0.20×0.13mm Micro Chip Resistors 01005 0.40×0.20×0.15mm

[0081] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A wearable NFC integrated ring, characterized in that: It includes a ring body, an antenna coil and a control chip. The ring body is made of metal material. A accommodating cavity is provided in the ring body. The antenna coil and the control chip are both placed in the accommodating cavity. The antenna coil is electrically connected to the control chip. The side wall of the ring body is also provided with an opening, which is connected to the accommodating cavity. The opening is used to ensure that at least part of the antenna coil is exposed to the outside.

2. The wearable NFC integrated ring according to claim 1, characterized in that: It also includes a filling piece, which is made of a non-metallic material and is placed in the opening.

3. The wearable NFC integrated ring according to claim 2, characterized in that: The filling piece is made of a graphene composite material obtained by mixing graphene nanosheets with a polyimide matrix material.

4. The wearable NFC integrated ring according to claim 3, characterized in that: The mixing ratio of the graphene nanosheets to the polyimide matrix material is 5:95 (by mass).

5. The wearable NFC integrated ring according to claim 1, characterized in that: A slot for fixing the antenna coil is also provided in the accommodating cavity. The slot is in a spiral structure and is coaxially arranged with the ring body. The antenna coil is wound around the ring body through the slot.

6. The wearable NFC integrated ring according to claim 5, characterized in that: The antenna coil satisfies the following formula: Where L is the expected value of the antenna coil inductance, N is the number of turns of the antenna coil, μ0 is the vacuum permeability of the antenna coil, and μ r is the relative magnetic permeability of the antenna coil material, D is the inner diameter of the antenna coil, W is the wire diameter of the antenna coil, H is the coil height of the antenna coil, and P is the pitch of the antenna coil.

7. The wearable NFC integrated ring according to claim 6, characterized in that: The expected value of the antenna coil inductance is 2-5 μH.

8. The wearable NFC integrated ring according to claim 1, characterized in that: It also includes a flexible circuit board, the control chip is arranged on the flexible circuit board, and the control chip is connected to the antenna coil through the flexible circuit board.

9. A control circuit for a wearable NFC integrated ring, applied to the wearable NFC integrated ring according to any one of claims 1 to 8, characterized in that: It includes an NFC control chip, a signal receiving module, an LC low-pass filter circuit, a matching circuit and an antenna coil circuit. The signal receiving module is electrically connected to the NFC control chip, and the signal receiving module is used to receive signals and transmit the signals to the NFC control chip; the LC low-pass filter circuit is electrically connected to the NFC control chip, and is used to filter out high-frequency signals emitted by the NFC control chip; the matching circuit is arranged between the LC low-pass filter circuit and the antenna coil circuit, and is used to adjust the resonant frequency of the antenna coil circuit.

10. The control circuit for a wearable NFC integrated ring according to claim 9, characterized in that: The model of the NFC control chip is NXP-CLRC663.

Images