Electronic system, peripheral device and electronic device

Abstract

This application provides an electronic system, an external device, and an electronic device, relating to the field of electronic device technology, for ensuring the normal operation of the NFC function of an electronic device when a first external module is installed on it. The electronic system includes a first external module and an electronic device, which are detachably connected. The first external module includes a first coil and a first signal transmission structure, with the first signal transmission structure connected to the first coil. The electronic device includes an NFC chip and a second signal transmission structure, with the second signal transmission structure connected to the NFC chip. When the first external module is installed on the electronic device, the second signal transmission structure is coupled to the first signal transmission structure, and the first coil acts as a radiating antenna.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and more particularly to an electronic system, external device, and electronic equipment. Background Technology

[0002] With the continuous development of terminal devices and the widespread adoption of NFC (near field communication) technology, users are increasingly using NFC. However, as terminal devices evolve in form factor, camera modules can be detachably mounted on the back cover. When a camera module is mounted on the back cover, it can obstruct the NFC antenna, thus affecting the normal operation of the NFC function. Utility Model Content

[0003] The purpose of the embodiments of this application is to provide an electronic system, external device, and electronic device for ensuring the normal use of the NFC function of the electronic device when a first external module is installed on the electronic device.

[0004] To achieve the above objectives, embodiments of this application provide the following technical solutions:

[0005] On one hand, an electronic system is provided. The electronic system includes: a first external module and an electronic device, which are detachably connected. The first external module includes: a first coil and a first signal transmission structure, the first signal transmission structure being connected to the first coil. The electronic device includes an NFC chip and a second signal transmission structure, the second signal transmission structure being connected to the NFC chip. When the first external module is mounted on the electronic device, the second signal transmission structure is coupled to the first signal transmission structure, and the first coil serves as a radiating antenna.

[0006] In the electronic system provided in this application embodiment, when the first external module of the external device is installed on the electronic device, the first coil can be coupled to the NFC chip through the first signal transmission structure and the second signal transmission structure. At this time, the first coil can act as a radiating antenna, and the first coil can capture and transmit NFC signals to realize the NFC function. Therefore, when the first external module of the external device is installed on the electronic device, the first external module will not affect the NFC function of the electronic device, thereby ensuring the normal use of the NFC function of the electronic device.

[0007] In some embodiments, the electronic device further includes a second coil, a first tuning module, and a first switch module, wherein the second coil is connected to the NFC chip, and the first switch module is connected between the first tuning module and the second coil; when the first external module is installed on the electronic device, the first switch module is in a first state, and the first tuning module is disconnected from the second coil; when the first external module is not installed on the electronic device, the first switch module is in a second state, the first tuning module is connected to the second coil, the second coil serves as a radiating antenna, and the first tuning module is used to adjust the resonant frequency of the second coil to a preset frequency.

[0008] When the first external module is installed on the electronic device, the first switch module disconnects the first tuning module from the second coil. In this case, the first tuning module cannot adjust the resonant frequency of the second coil, and the second coil does not function as a radiating coil. Therefore, when the first external module of the external device is not installed on the electronic device, the second coil can act as a radiating antenna, capturing or outputting electromagnetic signals of a preset frequency, thus enabling the electronic device to perform NFC functionality.

[0009] In some embodiments, the first tuning module includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; the first switch module includes a first switch, a second switch, a third switch, and a fourth switch; the NFC chip includes a first connection terminal and a second connection terminal; wherein, a first terminal of the first switch is connected to a first terminal of the second switch, and the first terminals of the first and second switches are connected to the first connection terminal of the NFC chip; a second terminal of the first switch is connected to one terminal of the first capacitor, and the other terminal of the first capacitor is grounded; a second terminal of the second switch is connected to a first connection terminal of the second coil; a third terminal of the second switch is connected to one terminal of the second capacitor, and the other terminal of the second capacitor is connected to the first connection terminal of the second coil; a first terminal of the third switch is connected to a first terminal of the fourth switch, and the first terminals of the third and fourth switches are connected to the NFC chip. The second connection terminal; the second end of the third switch is connected to one end of the third capacitor, the other end of the third capacitor is grounded, the second end of the fourth switch is connected to the second connection terminal of the second coil, the third end of the fourth switch is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to the second connection terminal of the second coil; when the first external module is installed on the electronic device, the first switch is open, the third switch is open, and the first end of the second switch is connected to the second end of the second switch, and the first end of the fourth switch is connected to the second end of the fourth switch, thereby putting the first switch module in the first state; when the first external module is not installed on the electronic device, the first switch is on, the third switch is on, and the first end of the second switch is connected to the third end of the second switch, and the first end of the fourth switch is connected to the third end of the fourth switch, thereby putting the first switch module in the second state.

[0010] When the first switch is open, the first capacitor cannot be connected to the first terminal of the second coil. When the first terminal of the second switch is connected to the second terminal of the second switch, the second capacitor is disconnected from the first terminal of the second coil. When the third switch is open, the third capacitor cannot be connected to the second terminal of the second coil. When the first terminal of the fourth switch is connected to the second terminal of the fourth switch, the fourth capacitor is disconnected from the second terminal of the second coil. Thus, when the first external module is installed on the electronic device, the first switch module is in a first state, thereby disconnecting the first tuning module from the second coil. When the first switch is closed, the first capacitor can be connected to the first terminal of the second coil through the first switch. When the first terminal of the second switch is connected to the third terminal of the second switch, the second capacitor can be connected to the first terminal of the second coil through the second switch. When the third switch is closed, the third capacitor can be connected to the second terminal of the second coil through the third switch. When the first terminal of the fourth switch is connected to the third terminal of the fourth switch, the fourth capacitor can be connected to the second terminal of the second coil through the fourth switch. Thus, when the first external module is not installed on the electronic device, the first switch module is in the second state, thereby enabling the first tuning module to be connected to the second coil through the first switch module.

[0011] In some embodiments, the first signal transmission structure includes a first connector, and the second signal transmission structure includes a second connector; when the first external module is installed on the electronic device, the first connector is electrically connected to the second connector.

[0012] The NFC signal can be transmitted between the first connector and the second connector. Since the first connector and the second connector are electrically connected, the NFC signal loss is small when it is transmitted between the first connector and the second connector, thereby improving the quality of the NFC signal.

[0013] In some embodiments, the first signal transmission structure includes a third coil, and the second coil serves as a second signal transmission structure; when the first external module is mounted on the electronic device, the third coil is communicatively coupled to the second coil.

[0014] In this design, by setting the first signal transmission structure as the third coil, the third coil can complete the transmission of NFC signals without direct contact with the second coil. Therefore, the surface of the first external module and electronic device does not need to have connectors for NFC signal transmission, which helps to improve the appearance of the first external module and electronic device.

[0015] In some embodiments, the number of turns of the third coil is the same as that of the second coil, and when the first external module is mounted on the electronic device, the third coil and the second coil overlap in a first direction, wherein the first direction is perpendicular to the plane in which the second coil is located.

[0016] This configuration increases the coupling between the third coil and the second coil, thereby ensuring effective signal transmission between them and reducing energy attenuation during NFC signal transmission. The transmission of NFC signals between the third coil and the second coil can include both transmission from the third coil to the second coil and transmission from the second coil to the third coil.

[0017] In some embodiments, when the first external module is mounted on an electronic device, the first coil is located on the side of the third coil opposite to the second coil.

[0018] With this configuration, when the first external module is installed on an electronic device, the second coil can communicate and couple with the third coil without physical contact. In this case, the second and third coils are positioned directly opposite each other, thereby shortening the distance between them, increasing the coupling between them, and reducing NFC signal loss. Furthermore, by placing the third coil on the side of the second coil away from the first coil, it is easier for the first coil to sense other NFC devices.

[0019] In some embodiments, the first external module further includes a first ferrite layer and a third ferrite layer, and the electronic device includes a second ferrite layer, wherein the first ferrite layer is located on the side of the first coil facing the third coil, the second ferrite layer is located on the side of the second coil away from the first coil, and the third ferrite layer is located on the side of the third coil facing the first coil.

[0020] This configuration, by placing a third ferrite layer on the side of the third coil facing away from the second coil, and a second ferrite layer on the side of the second coil facing away from the third coil, increases the coupling between the third and second coils, ensuring strong coupling and reducing energy attenuation of the NFC signal during transmission between them. Furthermore, by placing a first ferrite layer on the side of the first coil facing the third coil, the coupling between the first coil and other NFC devices is increased, further reducing NFC signal loss.

[0021] In some embodiments, the first external module further includes: a first metal layer and / or a third metal layer, wherein the first metal layer is disposed on the surface of the first ferrite layer opposite to the first coil, and the third metal layer is disposed on the surface of the third ferrite layer opposite to the third coil; and / or, the electronic device further includes a second metal layer, wherein the second metal layer is disposed on the surface of the second ferrite layer opposite to the second coil.

[0022] By incorporating a metal layer, interference from the NFC signal within the coil, connected to the ferrite layer via this metal layer, can be reduced to other components within the coil's assembly. Furthermore, the heat generated by the coil can be transferred to the metal layer through the ferrite layer, thus improving the coil's heat dissipation efficiency. For example, a first metal layer can reduce interference from the NFC signal in the first coil to other components in the first external module, while also improving the first coil's heat dissipation. Similarly, a second metal layer can reduce interference from the NFC signal in the second coil to other components in the electronic device, while also improving the second coil's heat dissipation. And finally, a third metal layer can reduce interference from the NFC signal in the third coil to other components in the first external module, while also improving the third coil's heat dissipation.

[0023] In some embodiments, the first external module further includes: a second tuning module connected to the first coil, the second tuning module being used to adjust the resonant frequency of the first coil to a preset frequency, wherein the first coil includes a first connection terminal and a second connection terminal; the first signal transmission structure includes a first connection terminal and a second connection terminal; the second tuning module includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor; wherein one end of the fifth capacitor is connected to the first connection terminal of the first coil, and the other end is connected to the first connection terminal of the first signal transmission structure; one end of the sixth capacitor is connected to the first connection terminal of the first coil, and the other end is grounded; one end of the seventh capacitor is connected to the second connection terminal of the first coil, and the other end is connected to the second connection terminal of the first signal transmission structure; one end of the eighth capacitor is connected to the second connection terminal of the first coil, and the other end is grounded.

[0024] By setting the fifth, sixth, seventh, and eighth capacitors, the second tuning module can adjust the resonant frequency of the first coil to a preset frequency.

[0025] In some embodiments, the electronic system further includes: a second external module, the second external module including a fourth coil and a fifth coil, the fourth coil being connected to the fifth coil; the first external module further includes a second switch module and a second tuning module, the second switch module being connected between the second tuning module and the first coil. When the second external module and the first external module are stacked and installed on the electronic device, the second external module is positioned on the side of the first external module away from the electronic device; the second switch module is in a third state, when the second switch module is in the third state, the second tuning module is disconnected from the first coil; the fourth coil is communicatively coupled to the first coil, and the fifth coil serves as a radiating antenna; when the second external module is installed on the electronic device, the fourth coil is communicatively coupled to the second coil, and the fifth coil serves as a radiating antenna; when the first external module is installed on the electronic device, the second switch module is in a fourth state, when the second switch module is in the fourth state, the second tuning module is connected to the first coil through the second switch module, and the second tuning module is used to adjust the resonant frequency of the first coil to a preset frequency.

[0026] By incorporating a second external module, the electronic device can gain additional functionality. When the second and first external modules are stacked and installed on the electronic device, the second switch module can be in a third state, disconnecting the second tuning module from the first coil. The fourth coil is communicatively coupled to the first coil, and the fifth coil acts as a radiating antenna, ensuring the normal operation of the electronic system's NFC function. When the second external module is installed alone on the electronic device, the fourth coil is communicatively coupled to the second coil, and the fifth coil acts as a radiating antenna, thus maintaining the NFC function. When the first external module is installed alone on the electronic device, the second switch module is in a fourth state. In this state, the second tuning module is connected to the first coil via the second switch module, and the first coil of the first external module acts as a radiating antenna, further ensuring the continued functionality of the electronic system's NFC function.

[0027] In some embodiments, the third coil includes a first connection terminal and a second connection terminal, and the first coil includes a first connection terminal and a second connection terminal; the second switch module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch. The second tuning module includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor; the first terminal of the fifth switch and the first terminal of the sixth switch are connected and connected to the first connection terminal of the third coil; the second terminal of the fifth switch is connected to the first terminal of the sixth capacitor, and the second terminal of the sixth capacitor is connected to ground; the second terminal of the sixth switch is connected to the first connection terminal of the first coil, the third terminal of the sixth switch is connected to the first terminal of the fifth capacitor, and the second terminal of the fifth capacitor is connected to the first connection terminal of the first coil; the first terminal of the seventh switch is connected to the second terminal of the eighth switch and connected to the second connection terminal of the third coil, the second terminal of the seventh switch is connected to the first terminal of the eighth capacitor, and the second terminal of the eighth capacitor is grounded; the second terminal of the eighth switch is connected to the second connection terminal of the first coil, the third terminal of the eighth switch is connected to the first terminal of the seventh capacitor, and the second terminal of the seventh capacitor is connected to the second connection terminal of the first coil. When the second switch module is in the third state, the fifth switch is off, the seventh switch is off, and the first end of the sixth switch is connected to the second end of the sixth switch and the first end of the eighth switch is connected to the second end of the eighth switch; when the second switch module is in the fourth state, the fifth switch is on, the seventh switch is on, and the first end of the sixth switch is connected to the third end of the sixth switch and the first end of the eighth switch is connected to the third end of the eighth switch.

[0028] With this configuration, when the first and second external modules are stacked and installed on the electronic device, the second switch module of the first external module can be in a third state. This allows the second tuning module to disconnect from the first coil, enabling the first coil to communicate with the fourth coil, allowing NFC signal transmission between them. When the first external module is installed alone on the electronic device, the second switch module is in a fourth state. This allows the second tuning module to connect to the first coil via the second switch module and adjust the resonant frequency of the first coil to a preset frequency, thus enabling the first coil to function as a radiating antenna.

[0029] On the other hand, an external device is provided, configured for detachable connection to an electronic device. The external device includes a first external module comprising a first coil and a first signal transmission structure, the first signal transmission structure being coupled to a second signal transmission structure of the electronic device, and the first signal transmission structure being further connected to the first coil.

[0030] In the external device provided in this application embodiment, the first signal transmission structure can be coupled to the second signal transmission structure of the electronic device. Therefore, the electronic device can transmit NFC signals with the external device. Wherein, when the first external module of the external device is installed on the electronic device, the first coil can act as a radiating antenna, thus the NFC function of the electronic device can be used normally.

[0031] In some embodiments, the first signal transmission structure includes a first connector for electrical connection with a second connector of an electronic device.

[0032] In the case where the first signal transmission structure is the first connector, the first external module can output or receive NFC signals through the first connector, thereby reducing NFC signal loss. When the first external module is installed on an electronic device, the first external module can be electrically connected to the second connector of the electronic device through the first connector, thereby reducing NFC signal loss between the first external module and the electronic device.

[0033] In some embodiments, the first signal transmission structure includes a third coil for communicatively coupling with a second coil of an electronic device.

[0034] The first external module can output or receive NFC signals through the third coil. Therefore, there is no need to install a connector on the outer surface of the first external module for transmitting NFC signals, thus ensuring the appearance of the first external module.

[0035] In some embodiments, the first external module further includes a first ferrite layer and a third ferrite layer, wherein the first ferrite layer is located on the side of the first coil facing the third coil, and the third ferrite layer is located on the side of the third coil facing the first coil.

[0036] Specifically, by adding a first ferrite layer, the coupling between the first coil of the first outer module and other NFC devices can be increased, thereby improving the transmission effect of NFC signals and reducing losses. Furthermore, by adding a third ferrite layer, the coupling between the third coil and the second coil can be increased, thereby improving the transmission effect of NFC signals and reducing losses.

[0037] In some embodiments, the first external module further includes: a first metal layer and / or a third metal layer, wherein the first metal layer is disposed on the surface of the first ferrite layer opposite to the first coil, and the third metal layer is disposed on the surface of the third ferrite layer opposite to the third coil.

[0038] The first metal layer reduces interference from the NFC signal in the first coil to other devices in the first external module, while also improving the heat dissipation of the first coil. Similarly, the third metal layer reduces interference from the NFC signal in the third coil to other devices in the first external module, while also improving the heat dissipation of the third coil.

[0039] In some embodiments, the first coil includes a first connection terminal and a second connection terminal, and the first signal transmission structure includes a first connection terminal and a second connection terminal; the first external module further includes: a second tuning module, the second tuning module being connected to the first coil, the second tuning module being used to adjust the resonant frequency of the first coil to a preset frequency, wherein the second tuning module includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor; wherein one end of the fifth capacitor is connected to the first connection terminal of the first coil, and the other end is connected to the first connection terminal of the first signal transmission structure; one end of the sixth capacitor is connected to the first connection terminal of the first coil, and the other end is grounded; one end of the seventh capacitor is connected to the second connection terminal of the first coil, and the other end is connected to the second connection terminal of the first signal transmission structure; one end of the eighth capacitor is connected to the second connection terminal of the first coil, and the other end is grounded.

[0040] By setting the fifth, sixth, seventh, and eighth capacitors, the second tuning module can adjust the resonant frequency of the first coil to a preset frequency.

[0041] In some embodiments, the external device further includes: a second external module, the second external module including a fourth coil and a fifth coil, the fourth coil being used for communicative coupling with the first coil, and the fifth coil being connected to the fourth coil; the first external module further includes: a second switch module and a second tuning module, the second switch module being connected between the first coil and the second tuning module. When the second external module and the first external module are stacked and installed on the electronic device, the second external module is positioned on the side of the first external module facing away from the electronic device; the second switch module is in a third state, when the second switch module is in the third state, the second tuning module is disconnected from the first coil; the fourth coil is communicatively coupled to the first coil, and the fifth coil serves as a radiating antenna. When the second external module is installed on the electronic device, the fourth coil is communicatively coupled to the second coil, and the fifth coil serves as a radiating antenna. When the first external module is installed on the electronic device, the second switch module is in a fourth state, when the second switch module is in the fourth state, the second tuning module is connected to the first coil through the second switch module, and the second tuning module is used to adjust the resonant frequency of the first coil to a preset frequency.

[0042] The second external module adds functionality for connected devices. Furthermore, when the second switch module is in its third state, the second tuning module can be disconnected from the first coil. Therefore, the fourth coil of the second external module can be communicatively coupled to the first coil of the first external module, allowing the fifth coil to function as a radiating antenna and enabling NFC functionality. When the first external module is installed independently on the electronic device, the second switch module is in its fourth state. In this case, the second tuning module can be connected to the first coil, allowing the first coil to function as a radiating coil. Again, when the second external module is installed independently on the electronic device, the fourth coil can be communicatively coupled to the second coil, allowing the fifth coil to function as a radiating antenna.

[0043] On the other hand, an electronic device is provided. The electronic device includes: an NFC chip and a second signal transmission structure, the second signal transmission structure being connected to the NFC chip and used for coupling with a first signal transmission structure of a first external module of an external device.

[0044] In the electronic device provided in the embodiments of this application, the NFC chip is connected to the second signal transmission structure. The second signal transmission structure can receive or output NFC signals. The second signal transmission structure can be coupled to the first signal transmission structure of the first external module. Thus, the second signal structure can output NFC signals to the first signal transmission structure or receive NFC signals from the first signal transmission structure, thereby enabling the NFC function of the electronic device.

[0045] In some embodiments, the electronic device further includes: a second coil, a first tuning module, and a first switch module, wherein the second coil is connected to the NFC chip, and the first switch module is connected between the first tuning module and the second coil; when the first switch module is in a first state, the first tuning module is disconnected from the second coil; when the first switch module is in a second state, the first tuning module is connected to the second coil, the second coil serves as a radiating antenna, and the first tuning module is used to adjust the resonant frequency of the second coil to a preset frequency.

[0046] Specifically, when the first switch module is in the first state, the second tuning module is disconnected from the second coil, and the electronic device can achieve NFC functionality through the first external module. When the first switch module is in the second state, the second tuning module is connected to the second coil, and the second coil can act as a radiating coil, thereby enabling the electronic device to achieve NFC functionality.

[0047] In some embodiments, the second signal transmission structure includes a second connector for electrical connection with a first connector of a first external module.

[0048] The second connector can be used to transmit NFC signals. The second connector can be physically and electrically connected to other connectors (such as the first connector), thereby reducing the loss of NFC signals.

[0049] In some embodiments, the second coil serves as a second signal transmission structure, and is used for communication coupling to the third coil of the first external module or the fourth coil of the second external module of the external device.

[0050] The second coil can serve as a second signal transmission structure. In this case, the second coil can be used to transmit NFC signals. Therefore, there is no need to place a connector on the surface of the electronic device for transmitting NFC signals, thus ensuring the aesthetics of the electronic device. Attached Figure Description

[0051] Figure 1 This is a structural diagram of a terminal device and a camera module in related technologies;

[0052] Figure 2 A schematic diagram of the structure of the electronic system provided in the embodiments of this application;

[0053] Figure 3 for Figure 2 Another structural diagram of the electronic system in the diagram;

[0054] Figure 4 for Figure 2 Block diagram of the electronic system in the diagram;

[0055] Figure 5 for Figure 2 Another structural block diagram of the electronic system in the diagram;

[0056] Figure 6 for Figure 5 A schematic diagram of the matching network between the electronic devices and the first external module;

[0057] Figure 7 for Figure 5 A schematic diagram of another matching network between the electronic devices and the first external module;

[0058] Figure 8 for Figure 5 The simulation diagram of NFC signal transmission when the first external module is installed in an electronic device;

[0059] Figure 9 for Figure 2 Another structural diagram of the electronic system in the image;

[0060] Figure 10 for Figure 2 Another structural diagram of the electronic system in the image;

[0061] Figure 11 for Figure 9 A schematic diagram of the matching network between the electronic devices and the first external module;

[0062] Figure 12 for Figure 9 A schematic diagram of another matching network between the electronic devices and the first external module;

[0063] Figure 13 for Figure 9 A schematic diagram of the structure of the first external module in the system;

[0064] Figure 14 for Figure 13 A schematic diagram of the structure of the first external module in the image from another perspective;

[0065] Figure 15 for Figure 9 The simulation diagram of NFC signal transmission when the first external module is installed in an electronic device;

[0066] Figure 16 A schematic diagram of the structure when the first external module and the second external module are stacked and installed on an electronic device;

[0067] Figure 17 for Figure 16 Block diagram of the electronic system in the diagram;

[0068] Figure 18 for Figure 17 When the second external module is installed in an electronic device, the structural block diagram of the electronic system is shown.

[0069] Figure 19 for Figure 17 The block diagram of the electronic system when the first external module is installed in the electronic device;

[0070] Figure 20 for Figure 17 A network matching diagram of the electronic devices, the first external module, and the second external module in the diagram;

[0071] Figure 21 for Figure 20 The circuit diagrams of the first and second external modules are shown. Detailed Implementation

[0072] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0073] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" and its other forms, such as the third-person singular "comprising" and the present participle "comprising," are interpreted as open-ended and inclusive, meaning "including, but not limited to." In the description of the specification, terms such as "some embodiments," "example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0074] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0075] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. The term "connected" should be interpreted broadly; for example, a "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium. The term "coupled," for example, indicates that two or more components have direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0076] As used herein, “vertical” includes the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “vertical” includes absolute verticality and approximate verticality, where an acceptable range of deviation for approximate verticality could, for example, be within 5°.

[0077] With the continuous development of terminal devices and the popularization of NFC (near field communication) technology, the scenarios in which users use NFC are increasing day by day.

[0078] Figure 1This is a structural diagram of a terminal device and a camera module in related technologies.

[0079] Please see Figure 1 As terminal devices evolve, camera modules can be detachably mounted on the back cover of the terminal device. When the camera module is mounted on the back cover of the terminal device, the camera module 01 will block the NFC antenna 03 in the terminal device 02, thereby affecting the function of the NFC antenna.

[0080] Based on this, the embodiments of this application provide an electronic system.

[0081] Figure 2 This is a schematic diagram of the structure of the electronic system provided in the embodiments of this application. Figure 3 for Figure 2 Another structural diagram of the electronic system in the diagram. Figure 4 for Figure 2 The block diagram of the electronic system in the diagram.

[0082] Please see Figure 2 , Figure 3 and Figure 4 This application provides an electronic system 3000, which includes an external device 1000 and an electronic device 2000. The external device 1000 and the electronic device 2000 are detachably connected.

[0083] Among them, electronic device 2000 can be a portable electronic device or other types of electronic devices. For example, electronic devices can be mobile phones, tablet personal computers, laptop computers, personal digital assistants (PDAs), monitors, cameras, personal computers, laptops, etc.

[0084] The external device 1000 may include a camera module, a deco component, an audio module, or a protective case for the aforementioned electronic device 2000.

[0085] For example, if the electronic device 2000 is a mobile phone, the external device 1000 can be connected to the back cover of the electronic device 2000.

[0086] For example, the external device 1000 and the electronic device 2000 can be connected magnetically, snap-fit, or connected via a connector. For example, the electronic device 2000 may have a female connector head, while the external device 1000 may have a male connector head. When the male connector head is inserted into the female connector head, the external device 1000 can be electrically connected to the electronic device 2000.

[0087] Please see Figure 2 and Figure 4 The external device 1000 may include a first external module 1001, which is detachably connected to the electronic device 2000. For example, the first external module 1001 and the electronic device 2000 may be magnetically connected, snap-fitted, or connected via a connector.

[0088] The first external module 1001 includes: a first coil 100 and a first signal transmission structure 300, wherein the first signal transmission structure 300 is connected to the first coil 100.

[0089] The electronic device 2000 includes an NFC (near field communication) chip 600 and a second signal transmission structure 900, which is connected to the NFC chip 600.

[0090] The NFC chip can be used to output NFC signals.

[0091] When the first external module 1001 is installed on the electronic device 2000, the second signal transmission structure 900 is coupled to the first signal transmission structure 300, and the first coil 100 serves as a radiating antenna.

[0092] For example, the first external module 1001 may be a camera module, a deco component, an audio module, or a protective case for the aforementioned electronic device 2000.

[0093] The term "coupling" can refer to, for example, direct physical or electrical contact between two or more components. It can also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other.

[0094] When the first external module 1001 is installed on the back cover of the electronic device 2000, the first coil 100 can be coupled to the NFC chip 600 through the first signal transmission structure 300 and the second signal transmission structure 900. At this time, the first coil 100 can act as a radiating antenna, and can sense or transmit NFC signals at a preset frequency. For example, the preset frequency can be 13.56MHz.

[0095] For example, when the first external module 1001 installed on the electronic device 2000 approaches the NFC tag, the first coil 100 can capture the NFC signal emitted by the NFC tag. The NFC signal captured by the first coil 100 can be transmitted to the NFC chip 600 through the first signal transmission structure 300 and the second signal transmission structure 900. When the electronic device 2000 transmits an NFC signal to other devices, the NFC signal emitted by the NFC chip 600 can be transmitted to the second signal transmission structure 900, and the second signal transmission structure 900 can then transmit the signal back to the first coil 100 through the first signal transmission structure 300. At this time, the first coil 100 acts as a radiating antenna to radiate the signal.

[0096] In the electronic system 3000 provided in this application embodiment, when the first external module 1001 of the external device 1000 is installed on the electronic device 2000, the first coil 100 can be coupled to the NFC chip 600 through the first signal transmission structure 300 and the second signal transmission structure 900. At this time, the first coil 100 can act as a radiating antenna, and the first coil 100 can capture and transmit NFC signals to realize the NFC function. Therefore, when the first external module 1001 of the external device 1000 is installed on the electronic device 2000, the first external module 1001 will not affect the NFC function of the electronic device 2000, thereby ensuring the normal use of the NFC function of the electronic device 2000.

[0097] Figure 5 for Figure 2 Another structural block diagram of the electronic system 3000 in the middle.

[0098] Please see Figure 5 In some embodiments, the electronic device 2000 includes a second coil 400, a first tuning module 500, and a first switch module 820, wherein the second coil 400 is connected to the NFC chip 600, and the first switch module 820 is connected between the first tuning module 500 and the second coil 400.

[0099] When the first external module 1001 is installed on the electronic device 2000, the first switch module 820 is in the first state, and the first tuning module 500 is disconnected from the second coil 400.

[0100] When the first external module 1001 is not installed on the electronic device 2000, the first switch module 820 is in the second state, the first tuning module 500 is connected to the second coil 400, the second coil 400 serves as a radiating antenna, and the first tuning module 500 is used to adjust the resonant frequency of the second coil 400 to a preset frequency.

[0101] When the first external module 1001 is installed on the electronic device 2000, the first switch module 820 can disconnect the first tuning module 500 from the second coil 400. At this time, the first tuning module 500 cannot adjust the resonant frequency of the second coil 400, and the second coil 400 does not act as a radiating coil.

[0102] When the first external module 1001 is not installed on the electronic device 2000, the first signal transmission structure 300 is disconnected from the second signal transmission structure 900, and thus the first coil 100 cannot be connected to the NFC chip 600. At this time, the first tuning module 500 can be connected to the second coil 400 through the first switch module 820. The first tuning module 500 can then adjust the resonant frequency of the second coil 400 to a preset frequency, allowing the second coil 400 to capture or emit electromagnetic signals at the preset frequency.

[0103] For example, when electronic device 2000 approaches an NFC tag, second coil 400 can capture the NFC signal emitted by the NFC tag, and the captured NFC signal can be transmitted to NFC chip 600. When electronic device 2000 transmits NFC signals to other devices, the NFC signal emitted by NFC chip 600 can be transmitted to second coil 400 and radiated out through second coil 400.

[0104] Therefore, when the first external module 1001 of the external device 1000 is not installed on the electronic device 2000, the second coil 400 can act as a radiating antenna. The second coil 400 can capture or output electromagnetic signals of a preset frequency, thereby enabling the electronic device 2000 to realize NFC functionality.

[0105] For example, an electronic device 2000 may include a display panel 2001 and a back cover 2002, which are disposed opposite to each other, and a second coil 400 is located between the back cover 2002 and the display panel 2001, with the second coil 400 being closer to the back cover 2002.

[0106] Please see Figure 2 and Figure 3 In some embodiments, when the first external module 1001 is mounted on the electronic device 2000, the orthographic projection of the second coil 400 in the first direction F1 is located within the area covered by the orthographic projection of the first external module 1001. In this case, even if the second coil 400 is covered by the first external module 1001, the NFC function of the electronic device 2000 can still be implemented through the first external module 1001.

[0107] Please see Figure 5In some embodiments, the electronic device 2000 may further include a controller 830, which is connected to the first switch module 820. When the first external module 1001 is installed on the electronic device 2000, the controller 830 controls the first switch module 820 to be in a first state; when the first external module 1001 is not installed on the electronic device 2000, the controller 830 controls the first switch module 820 to be in a second state.

[0108] Specifically, by setting up a controller 830, the controller 830 can adjust the first switch module 820 to switch between a first state and a second state, thereby enabling the first tuning module 500 and the second coil 400 to be connected or disconnected.

[0109] For example, the controller 830 can be a CPU (central processing unit).

[0110] Figure 6 for Figure 5 A schematic diagram of the matching network between the electronic device 2000 and the first external module 1001; Figure 7 for Figure 5 A schematic diagram of another matching network between the electronic device 2000 and the first external module 1001.

[0111] Please see Figure 6 and Figure 7 In some embodiments, the second coil 400 includes a first connection terminal 401 and a second connection terminal 402, and the NFC chip 600 includes a first connection terminal 601 and a second connection terminal 602.

[0112] For example, the first connection terminal 601 of the NFC chip 600 may include a first receive pin RXP and a first transmit pin TX1, and the second connection terminal 602 may include a second receive pin RXN and a second transmit pin TX2.

[0113] Among them, Figure 7 In the illustrated embodiment, the second coil 400 is a double-ended coil. Of course, in some other embodiments, the second coil 400 may also be a single-ended coil.

[0114] The first tuning module 500 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The first switch module 820 includes a first switch 821, a second switch 822, a third switch 823, and a fourth switch 824.

[0115] The first switch 821 includes a first end and a second end, which can be connected or disconnected.

[0116] The second switch 822 includes a first end, a second end, and a third end, wherein the first end of the second switch 822 can be connected to either the second end or the third end of the second switch 822.

[0117] The third switch 823 includes a first terminal and a second terminal, which can be connected or disconnected.

[0118] The fourth switch 824 includes a first terminal, a second terminal, and a third terminal, wherein the first terminal of the fourth switch 824 can be connected to either the second terminal or the third terminal of the fourth switch 824.

[0119] Specifically, the first end of the first switch 821 is connected to the first end of the second switch 822, and the first ends of both switches 821 and 822 are connected to the first connection terminal 601 of the NFC chip 600. The second end of the first switch 821 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded. The second end of the second switch 822 is connected to the first connection terminal 401 of the second coil 400, and the third end of the second switch 822 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the first connection terminal 401 of the second coil 400.

[0120] The first terminal of the third switch 823 is connected to the first terminal of the fourth switch 824, and the first terminals of both the third switch 823 and the fourth switch 824 are connected to the second connection terminal 602 of the NFC chip 600. The second terminal of the third switch 823 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded. The second terminal of the fourth switch 824 is connected to the second connection terminal 402 of the second coil 400, and the third terminal of the fourth switch 824 is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is connected to the second connection terminal 402 of the second coil 400.

[0121] The number of first capacitors C1 can be one or more. When there are multiple first capacitors C1, the multiple first capacitors C1 are connected in parallel.

[0122] The number of second capacitors C2 can be one or more. When there are multiple second capacitors C2, they are connected in parallel.

[0123] The number of third capacitors C3 can be one or more. When there are multiple third capacitors C3, they are connected in parallel.

[0124] The number of fourth capacitors C4 can be one or more. When there are multiple fourth capacitors C4, they are connected in parallel.

[0125] When the first external module 1001 is installed on the electronic device 2000, the first switch 821 is disconnected, the third switch 823 is disconnected, the first end of the second switch 822 is connected to the second end of the second switch 822, and the first end of the fourth switch 824 is connected to the second end of the fourth switch 824, thereby putting the first switch module 820 in the first state, so that the first tuning module 500 is disconnected from the second coil 400.

[0126] When the first switch 821 is open, the first capacitor C1 cannot be connected to the first connection terminal 401 of the second coil 400.

[0127] When the first terminal of the second switch 822 is connected to the second terminal of the second switch 822, the second capacitor C2 is disconnected from the first connection terminal 401 of the second coil 400.

[0128] When the third switch 823 is open, the third capacitor C3 cannot be connected to the second connection terminal 402 of the second coil 400.

[0129] When the first terminal of the fourth switch 824 is connected to the second terminal of the fourth switch 824, the fourth capacitor C4 is disconnected from the second connection terminal 402 of the second coil 400.

[0130] Thus, when the first external module 1001 is installed on the electronic device 2000, the first switch module 820 is in the first state, thereby disconnecting the first tuning module 500 from the second coil 400.

[0131] For example, the first switch 821, the second switch 822, the third switch 823, and the fourth switch 824 can be connected to the controller 830. In this way, the controller 830 can control the state of the first switch 821, the second switch 822, the third switch 823, and the fourth switch 824, so that the controller 830 can switch the state of the first switch module 820 between the first state and the second state.

[0132] When the first external module 1001 is installed on the electronic device 2000, the controller 830 can control the first switch 821 to be disconnected, the third switch 823 to be disconnected, and the first end of the second switch 822 to be connected to the second end of the second switch 822, and the first end of the fourth switch 824 to be connected to the second end of the fourth switch 824.

[0133] When the first external module 1001 is not installed on the electronic device 2000, the first switch 821 and the third switch 823 are turned on, the first end of the second switch 822 is connected to the third end of the second switch 822, and the first end of the fourth switch 824 is connected to the third end of the fourth switch 824. Thus, the first switch module 820 is in the second state, so that the first tuning module 500 is connected to the second coil 400.

[0134] When the first switch 821 is turned on, the first capacitor C1 can be connected to the first connection terminal 401 of the second coil 400 through the first switch 821.

[0135] When the first end of the second switch 822 is connected to the third end of the second switch 822, the second capacitor C2 can be connected to the first connection end 401 of the second coil 400 through the second switch 822.

[0136] When the third switch 823 is turned on, the third capacitor C3 can be connected to the second connection terminal 402 of the second coil 400 through the third switch 823.

[0137] When the first terminal of the fourth switch 824 is connected to the third terminal of the fourth switch 824, the fourth capacitor C4 can be connected to the second connection terminal 402 of the second coil 400 through the fourth switch 824.

[0138] Thus, when the first external module 1001 is not installed on the electronic device 2000, the first switch module 820 is in the second state, thereby enabling the first tuning module 500 to be connected to the second coil 400 through the first switch module 820.

[0139] For example, when the first external module 1001 is installed on the electronic device 2000, the controller 830 can control the first switch 821 to be turned on and the third switch 823 to be turned on, and the first end of the second switch 822 to be connected to the third end of the second switch 822, and the first end of the fourth switch 824 to be connected to the third end of the fourth switch 824.

[0140] Please see Figure 6 and Figure 7 The electronic device 2000 may also include a filter circuit, which may include capacitors C01, C02, C03, and C04, and inductors L1 and L2.

[0141] The first transmitting pin TX1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the first end of the second switch 822. In this way, the inductor L1 can be connected to the first connection end 401 of the second coil 400 through the second switch 822.

[0142] The second transmit pin TX2 is connected to one end of inductor L2, and the other end of inductor L2 is connected to the first end of the fourth switch 824.

[0143] One end of capacitor C01 is connected to the other end of inductor L1 and the first end of the second switch 822, and the other end of capacitor C01 is grounded; one end of capacitor C02 is connected to the other end of inductor L1 and the first end of the second switch 822, and the other end of capacitor C02 is grounded; one end of capacitor C03 is connected to the other end of inductor L2 and the first end of the fourth switch 824, and the other end of capacitor C03 is grounded; one end of capacitor C04 is connected to the other end of inductor L2 and the first end of the fourth switch 824, and the other end of capacitor C04 is grounded.

[0144] The electronic device 2000 may also include a voltage divider circuit, wherein the voltage divider circuit includes capacitor C05, capacitor C06, a first resistor R1 and a second resistor R2.

[0145] The first receiving pin RXP is connected to one end of capacitor C05, the other end of capacitor C05 is connected to one end of resistor R1, and the other end of resistor R1 is connected to the first end of the second switch 822.

[0146] The second receiving pin RXN is connected to one end of capacitor C06, the other end of capacitor C06 is connected to one end of resistor R2, the other end of resistor R2 is connected to the first end of the fourth switch 824, and then the other end of resistor R2 can be connected to the second connection terminal 402 of the second coil 400 through the fourth switch 824.

[0147] Please see Figures 4 to 7 In some embodiments, the first external module 1001 further includes a second tuning module 200, which is connected to the first coil 100 and is used to adjust the resonant frequency of the first coil 100 to a preset frequency.

[0148] The first signal transmission structure 300 includes a first connection terminal 301 and a second connection terminal 302, and the first coil 100 includes a first connection terminal 101 and a second connection terminal 102.

[0149] The second tuning module 200 includes a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8.

[0150] In this configuration, one end of the fifth capacitor C5 is connected to the first connection terminal 101 of the first coil 100, and the other end is connected to the first connection terminal 301 of the first signal transmission structure 300. In some examples, the number of fifth capacitors C5 can be one or more, such as... Figure 6 and Figure 7 As shown, there are two fifth capacitors C5, and the two fifth capacitors C5 are connected in parallel.

[0151] One end of the sixth capacitor C6 is connected to the first connection terminal 101 of the first coil 100, and the other end is grounded. In some examples, the number of sixth capacitors C6 can be one or more, such as... Figure 6 and Figure 7 As shown, there are two sixth capacitors C6, and the two sixth capacitors C6 are connected in parallel.

[0152] One end of the seventh capacitor C7 is connected to the second connection terminal 102 of the first coil 100, and the other end is connected to the second connection terminal 302 of the first signal transmission structure 300. In some examples, the number of seventh capacitors C7 can be one or more, such as... Figure 6 and Figure 7 As shown, there are two seventh capacitors C7, and the two seventh capacitors C7 are connected in parallel.

[0153] One end of the eighth capacitor C8 is connected to the second connection terminal 102 of the first coil 100, and the other end is grounded. In some examples, the number of eighth capacitors C8 can be one or more, such as... Figure 6 and Figure 7 As shown, there are two eighth capacitors C8, and the two eighth capacitors C8 are connected in parallel.

[0154] By setting the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8, the second tuning module 200 can adjust the resonant frequency of the first coil 100 to a preset frequency.

[0155] The first coil 100 can be a single-ended antenna or a double-ended antenna. Figure 11 In the example of a dual-ended antenna, the first coil 100 is illustrated.

[0156] Please see you later. Figure 2 In some embodiments, the first external module 1001 further includes an adapter 700, a second tuning module 200 disposed on the adapter 700, a first coil 100 connected to one end of the adapter 700, and a first signal transmission structure 300 connected to the other end of the adapter 700.

[0157] For example, adapter 700 can be a flexible printed circuit (FPC) or a circuit board.

[0158] The second tuning module 200 can be a tuning chip or a tuning circuit. The tuning chip can be disposed on the adapter 700, and the tuning circuit can include multiple electronic components. The electronic components can be soldered onto a circuit board, or the multiple electronic components can be formed in a flexible circuit board.

[0159] For example, the first coil 100 can be mounted on the adapter 700 via SMT (surface mount technology). The first signal transmission structure 300 can also be mounted on the adapter 700 via SMT.

[0160] The second tuning module 200 can be mounted on the adapter 700, and the first coil 100 and the first signal transmission structure 300 can be electrically connected through the adapter 700.

[0161] Please see Figure 2 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the first signal transmission structure 300 includes a first connector 320, and the second signal transmission structure 900 includes a second connector 940; when the first external module 1001 is installed on the electronic device 2000, the first connector 320 is electrically connected to the second connector 940.

[0162] For example, one of the first connector 320 and the second connector 940 is a male connector and the other is a female connector.

[0163] For example, a female connector includes a socket, while a male connector includes pins, where the pins can be pogo pins (spring pins).

[0164] For example, the first connector 320 and the second connector 940 can be magnetic connectors.

[0165] When the first external module 1001 is installed in the electronic device 2000, when the first external module 1001 is close to the NFC tag, the first coil 100 can capture the electromagnetic field signal emitted by the NFC tag. The signal captured by the first coil 100 can be transmitted to the NFC chip 600 through the first connector 320 and the second connector 940. When the electronic device 2000 transmits an NFC signal to other devices, the signal emitted by the NFC chip 600 can be transmitted to the second connector 940, and the second connector 940 can then transmit the signal to the first coil 100 through the first connector 320. At this time, the first coil 100 acts as a radiating antenna to radiate the signal.

[0166] The NFC signal can be transmitted between the first connector 320 and the second connector 940. Since the first connector 320 and the second connector 940 are electrically connected, the NFC signal has less loss when transmitted between the first connector 320 and the second connector 940, thereby improving the quality of the NFC signal.

[0167] In some examples, the first connector 320 may be disposed on one surface of the first external module 1001, while the second connector 940 may be disposed on one surface of the electronic device 2000. When the first external module 1001 is mounted on the electronic device 2000, the surface of the first external module 1001 with the first connector 320 may face the electronic device 2000, while the surface of the electronic device 2000 with the second connector 940 may face the first external module 1001, and the second connector 940 is located within the area covered by the first external module 1001. In this case, the second connector 940 mates with the first connector 320. For example, the second connector 940 may be exposed on the back cover 2002 of the electronic device 2000.

[0168] In some other examples, when the first external module 1001 is installed on the electronic device 2000, the surface in the first external module 1001 where the first connector 320 is provided can be exposed, and the second connector 940 can be the charging interface of the electronic device 2000. In this case, the first connector 320 and the second connector 940 can be connected by a data cable.

[0169] Please see Figure 6 and Figure 7 When the first signal transmission structure 300 is the first connector 320 and the second signal transmission structure 900 is the second connector 940, the first connector 320 includes a first terminal 321 and a second terminal 322. The first terminal 321 can serve as the first connection end 301 of the first signal transmission structure 300, and the second terminal 322 can serve as the second connection end 302 of the first signal transmission structure 300.

[0170] The second connector 940 includes a third terminal 941 and a fourth terminal 942. The third terminal 941 is connected between the first connection terminal 401 of the second coil 400 and the second terminal of the second switch 822, and the fourth terminal 942 is connected between the second connection terminal 402 of the second coil 400 and the second terminal of the fourth switch 824.

[0171] When the first external module 1001 is installed on the electronic device 2000, the first terminal 321 of the first connector 320 can be connected to the third terminal 941 of the second connector 940, and the second terminal 322 of the first connector 320 can be connected to the fourth terminal 942 of the second connector 940.

[0172] When the first signal transmission structure 300 is the first connector 320 and the second signal transmission structure 900 is the second connector 940, NFC signal simulation transmission is performed on the electronic device 2000. The self-inductance of the first coil 100 is 21.5H, the self-inductance of the first test coil is 9.51H, the mutual inductance between the first coil 100 and the first test coil is 7.2H, and the coupling coefficient between the first coil 100 and the first test coil is 0.50. The first coil 100 can capture the NFC signal emitted by the first test coil.

[0173] Figure 8 for Figure 5 The simulation diagram of NFC signal transmission when the first external module 1001 is installed in electronic device 2000.

[0174] Please see Figure 8 The resonant frequency of the first coil 100 can reach 13.560000MHz, which proves that the NFC function of the electronic system 3000 can be realized when the first signal transmission structure 300 is the first connector 320 and the second signal transmission structure 900 is the second connector 940.

[0175] The loss rate of the NFC signal is close to 0. Therefore, it can be concluded that when the first signal transmission structure 300 is the first connector 320 and the second signal transmission structure 900 is the second connector 940, the loss of the NFC signal is relatively small.

[0176] Figure 9 for Figure 2 Another structural schematic diagram of the electronic system 3000 in the middle; Figure 10 for Figure 2 Another structural schematic diagram of the electronic system 3000 in the middle; Figure 11 for Figure 9 A schematic diagram of the matching network between the electronic device 2000 and the first external module 1001; Figure 12 for Figure 9 A schematic diagram of another matching network between the electronic device 2000 and the first external module 1001.

[0177] Please see Figure 9 , Figure 10 , Figure 11 and Figure 12 In some embodiments, the first signal transmission structure 300 includes a third coil 310, and the second coil 400 serves as the second signal transmission structure 900.

[0178] When the first external module 1001 is installed on the electronic device 2000, the third coil 310 is communicatively coupled to the second coil 400.

[0179] The third coil 310 is communicatively coupled to the second coil 400. "Communicative coupling" means that the third coil 310 and the second coil 400 are not in direct contact, but still cooperate or interact with each other.

[0180] In some examples, the third coil 310 includes a first connection terminal 311 and a second connection terminal 312, and the first connection terminal 311 and the second connection terminal 312 of the third coil 310 can be respectively used as the first connection terminal 301 and the second connection terminal 302 of the first signal transmission structure 300.

[0181] The NFC signal output by the NFC chip 600 can be transmitted to the second coil 400. The NFC signal can be coupled to the third coil 310 through the second coil 400, and then transmitted to the first coil 100 through the third coil 310, and radiated out through the first coil 100.

[0182] The NFC signal captured by the first coil 100 can be transmitted to the third coil 310, and then coupled to the second coil 400 through the third coil 310, and then transmitted to the NFC chip 600.

[0183] By setting the first signal transmission structure 300 as the third coil 310, the third coil 310 and the second coil 400 can complete the transmission of NFC signals without direct contact. Therefore, the surfaces of the first external module 1001 and the electronic device 2000 do not need to have connectors for NFC signal transmission, which helps to improve the aesthetics of the first external module 1001 and the electronic device 2000.

[0184] Please see Figure 9 and Figure 10 In some embodiments, the first external module 1001 further includes a first ferrite layer 710 and a third ferrite layer 730, and the electronic device 2000 includes a second ferrite layer 720. The first ferrite layer 710 is located on the side of the first coil 100 facing the third coil 310, the second ferrite layer 720 is located on the side of the second coil 400 away from the first coil 100, and the third ferrite layer 730 is located on the side of the third coil 310 facing the first coil 100.

[0185] Ferrite is a non-metallic magnetic material, also known as ferrooxide. Ferrite is made by sintering ferric oxide and one or more other metal oxides, such as nickel oxide, zinc oxide, manganese oxide, magnesium oxide, barium oxide, strontium oxide, etc.

[0186] Specifically, a third ferrite layer 730 is disposed on the side of the third coil 310 facing away from the second coil 400, and a second ferrite layer 720 is disposed on the side of the second coil 400 facing away from the third coil 310. In other words, the third coil 310 and the second coil 400 are positioned between the third ferrite layer 730 and the second ferrite layer 720. This arrangement increases the coupling between the third coil 310 and the second coil 400, ensuring strong coupling and thus reducing energy attenuation when the NFC signal is transmitted between the third coil 310 and the second coil 400.

[0187] When the first external module 1001 is not installed on the electronic device 2000, by setting the second ferrite layer 720 on the side of the second coil 400 away from the third coil 310, the coupling between the second coil 400 and other NFC devices can be increased, thereby reducing the loss of NFC signals.

[0188] Furthermore, by providing a first ferrite layer 710 on the side of the first coil 100 facing the third coil 310, the coupling between the first coil 100 and other NFC devices can be increased, thereby reducing the loss of NFC signals.

[0189] Figure 13 for Figure 9 A schematic diagram of the structure of the first external module 1001 in the diagram. Figure 14 for Figure 13 A schematic diagram of the structure of the first external module 1001 from another perspective.

[0190] Please see Figure 13 and Figure 14 In some examples, the area of ​​the first ferrite layer 710 is larger than the area of ​​the first coil 100. In this case, the first coil 100 is located within the area covered by the first ferrite layer 710 in the first direction F1. The first direction F1 is perpendicular to the plane containing the first coil 100.

[0191] Please see you later. Figure 9 The area of ​​the second ferrite layer 720 is larger than the area of ​​the second coil 400. At this time, the second coil 400 is located within the area covered by the second ferrite layer 720 in the first direction F1.

[0192] Please see Figure 13 The area of ​​the third ferrite layer 730 is larger than the area of ​​the third coil 310. At this time, the third coil 310 is located within the area covered by the third ferrite layer 730 in the first direction F1.

[0193] The ferrite layers can be solid or hollow. In a solid ferrite layer, the area enclosed by its boundary is entirely filled with ferrite. In a hollow ferrite layer, the area enclosed by its boundary is partially filled with ferrite. For example, the hollow shape can be annular. The ferrite layers can be a first ferrite layer 710, a second ferrite layer 720, and a third ferrite layer 730.

[0194] Among them, Figure 9 , Figure 13 and Figure 14 The ferrite layer shown is a solid shape.

[0195] Please see you later. Figure 9 In some embodiments, when the first external module 1001 is mounted on the electronic device 2000, the first coil 100 is located on the side of the third coil 310 away from the second coil 400.

[0196] With this configuration, when the first external module 1001 is installed on the electronic device 2000, the second coil 400 can communicate with the third coil 310 without contact. At this time, the second coil 400 and the third coil 310 are positioned directly opposite each other, which can shorten the distance between the second coil 400 and the third coil 310, increase the coupling between the second coil 400 and the third coil 310, and reduce the loss of NFC signals.

[0197] In addition, by placing the third coil 310 on the side of the second coil 400 away from the first coil 100, it is easier for the first coil 100 to sense other NFC devices.

[0198] In some examples, the first external module 1001 may include a housing, which may include a first plate 750 and a second plate 760 disposed opposite to each other. A first coil 100 and a third coil 310 are located inside the housing, with the first coil 100 located on the side of the first plate 750 closer to the second plate 760, and the third coil 310 located on the side of the second plate 760 facing the first plate 750. When the first external module 1001 is mounted on the electronic device 2000, the first plate 750 is located on the side of the second plate 760 facing away from the electronic device 2000.

[0199] Please see you later. Figure 13 and Figure 14 The first external module 1001 may also include a side plate 770, with the first plate 750 and the second plate 760 located on both sides of the side plate 770. In this case, the side plate 770 is located on both sides of the first plate 750 and the second plate 760.

[0200] The third coil 310 can be used for SMT process mounting on the adapter 700.

[0201] Please see Figure 9 In some embodiments, the number of turns of the third coil 310 is the same as the number of turns of the second coil 400, and the third coil 310 and the second coil 400 overlap in a first direction F1, wherein the first direction F1 is perpendicular to the plane in which the second coil 400 is located.

[0202] This configuration increases the coupling between the third coil 310 and the second coil 400, thereby ensuring effective signal transmission between them and reducing energy attenuation during NFC signal transmission. The transmission of NFC signals between the third coil 310 and the second coil 400 can include both transmission from the third coil 310 to the second coil 400 and transmission from the second coil 400 to the third coil 310.

[0203] Please see Figure 9 In some examples, the number of turns of the third coil 310 is the same as that of the first coil 100, and the third coil 310 and the first coil 100 overlap in the first direction F1. In this case, the edge of the orthographic projection of the third coil 310 on the first plate 750 can overlap with the edge of the orthographic projection of the first coil 100 on the first plate 750.

[0204] At this time, the adapter 700 can be installed along the side plate 770.

[0205] Please see Figure 10 In other examples, the number of turns of the third coil 310 may be different from the number of turns of the first coil 100. In this case, the flexible circuit board serving as the adapter 700 may extend along the side plate 770 to the second plate body 760.

[0206] In some embodiments, the electronic system 3000 may further include a metal layer, wherein at least one of the first ferrite layer 710 facing away from the surface of the first coil 100, the second ferrite layer 720 facing away from the surface of the second coil 400, and the third ferrite layer 730 facing away from the surface of the third coil 310 is provided with a metal layer.

[0207] By incorporating a metal layer, interference from the NFC signal within the coil connected to the ferrite layer to other components in the coil's assembly can be prevented. Furthermore, the heat generated by the coil can be transferred to the metal layer through the ferrite layer, thus improving the coil's heat dissipation efficiency.

[0208] For example, the first metal layer can prevent the NFC signal in the first coil 100 from affecting other devices in the first external module 1001, while improving the heat dissipation of the first coil 100.

[0209] For example, the second metal layer can prevent the NFC signal in the second coil 400 from affecting other devices in the electronic device 2000, while also improving the heat dissipation of the second coil 400.

[0210] For example, the third metal layer can prevent the NFC signal in the third coil 310 from affecting other devices in the first external module 1001, while also improving the heat dissipation of the third coil 310.

[0211] With the first signal transmission structure 300 being the third coil 310 and the second coil 400 being the second signal transmission structure 900, NFC signal simulation transmission is performed on the electronic system 3000. The coupling coefficient between the second coil 400 and the third coil 310 is 0.86, the self-inductance of the first coil 100 is 23.57H, the self-inductance of the second test coil is 9.886H, the mutual inductance between the first coil 100 and the second test coil is 6.91H, and the coupling coefficient between the first coil 100 and the second test coil is 0.45. The first coil 100 can capture the NFC signal emitted by the second test coil.

[0212] Figure 15 for Figure 9 The simulation diagram of NFC signal transmission when the first external module 1001 is installed in electronic device 2000.

[0213] Please see Figure 15 The resonant frequency of the first coil 100 can reach 13.560000MHz, which proves that the NFC function of the electronic system 3000 can be realized when the first signal transmission structure 300 is the third coil 310 and the second coil 400 is the second signal transmission structure 900.

[0214] Furthermore, the NFC signal loss rate of this electronic system 3000 is approximately 10%.

[0215] Figure 16 This is a schematic diagram showing the structure of a first external module 1001 and a second external module 1002 stacked and mounted on an electronic device 1000. Figure 17 for Figure 16 The structural block diagram of the electronic system 3000 in the middle.

[0216] Please see Figure 16 In some embodiments, the external device 1000 may further include a second external module 1002, which includes a fourth coil 910 and a fifth coil 920, with the fourth coil 910 connected to the fifth coil 920.

[0217] The first external module 1001 also includes a second switch module 810 and a second tuning module 200, wherein the second switch module 810 is connected between the second tuning module 200 and the first coil 100.

[0218] When the second external module 1002 and the first external module 1001 are stacked and installed on the electronic device 2000, the second external module 1002 is located on the side of the first external module 1001 away from the electronic device 2000; the second switch module 810 is in the third state, and when the second switch module 810 is in the third state, the second tuning module 200 is disconnected from the first coil 100; the fourth coil 910 is communicatively coupled to the first coil 100, and the fifth coil 920 serves as a radiating antenna.

[0219] At this time, the first switch module 820 in the electronic device 2000 is in the first state, thereby disconnecting the first tuning module 500 from the second coil 400, and thus the second coil 400 cannot be used as a radiating antenna.

[0220] For example, the first external module 1001 and the second external module 1002 can be stacked along the first direction F1. The fourth coil 910 and the fifth coil 920 can be arranged sequentially along the first direction F1, and the fourth coil 910 is closer to the electronic device 2000 than the fifth coil 920.

[0221] For example, the second external module 1002 and the first external module 1001 can be magnetically connected, snap-fitted together, or connected via a connector. For example, the first external module 1001 can be provided with a female connector head, while the second external module 1002 can be provided with a male connector head. When the male connector head is inserted into the female connector head, the second external module 1002 can be electrically connected to the first external module 1001.

[0222] In the first external module 1001, when the second switch module 810 is in the third state, the second tuning module 200 is disconnected from the first coil 100 and the second tuning module 200 does not work.

[0223] By setting up a second external module 1002, the second external module 1002 can provide more functions for the electronic device 2000. Furthermore, when the second external module 1002 and the first external module 1001 are stacked and installed on the electronic device 2000, the second switch module 810 can be in a third state, thereby disconnecting the second tuning module 200 from the first coil 100. In addition, the third coil 310 can be communicatively coupled to the second coil 400, and the fourth coil 910 can be communicatively coupled to the first coil 100. Therefore, the signal output by the NFC chip 600 can be transmitted sequentially through the second coil 400, the third coil 310, the first coil 100, and the fourth coil 910 to the fifth coil 920. The fifth coil 920, acting as a radiating antenna, can radiate the NFC signal, and the NFC signal captured by the fifth coil 920, acting as a radiating antenna, can be transmitted sequentially through the fourth coil 910, the first coil 100, the third coil 310, and the second coil 400 to the NFC chip, thus enabling the normal operation of the NFC function of the electronic device 2000.

[0224] For example, the first external module 1001 can be a power supply module, while the second external module 1002 can be a camera module. As another example, the first external module 1001 can be an audio module, while the second external module 1002 can be a camera module. Yet another example is that one of the first external modules 1001 is an audio module, and the other is a power supply module. Of course, the first external module 1001 and the second external module 1002 can be implemented in many other ways, which will not be listed here.

[0225] Figure 18 for Figure 17 The structural block diagram of electronic system 3000 when the second external module 1002 is installed in electronic device 2000.

[0226] Please see Figure 18 When the second external module 1002 is installed on the electronic device 2000, the fourth coil 910 is communicatively coupled to the second coil 400, and the fifth coil 920 serves as a radiating antenna.

[0227] At this time, the NFC signal output by the NFC chip 600 can be coupled to the fourth coil 910 of the second external module 1002 through the second coil 400 of the electronic device 1000. Then the NFC signal can be transmitted from the fourth coil 910 of the second external module 1002 to the fifth coil 920 of the second external module 1002, and radiated out through the fifth coil 920, where the fifth coil 920 serves as a radiating antenna.

[0228] At this time, the first switch module 820 is in the first state, thereby disconnecting the first tuning module 500 from the second coil 400, and thus the second coil 400 cannot be used as a radiating antenna.

[0229] With this configuration, the NFC function of the electronic system 3000 can still be used when the second external module 1002 is installed alone on the electronic device 2000.

[0230] Figure 19 for Figure 17 The structural block diagram of electronic system 3000 when the first external module 1001 is installed in electronic device 2000.

[0231] Please see Figure 19 When the first external module 1001 is installed on the electronic device 2000, the second switch module 810 is in the fourth state. When the second switch module 810 is in the fourth state, the second tuning module 200 is connected to the first coil 100 through the second switch module 810. The second tuning module 200 is used to adjust the resonant frequency of the first coil 100 to a preset frequency.

[0232] With this configuration, the NFC function of the electronic system 3000 can still be used when the first external module 1001 is installed alone on the electronic device 2000.

[0233] Please see Figures 17 to 19 The controller 830 can be connected to the second switch module 810, and the controller 830 can control the second switch module 810 to switch between the third state and the fourth state.

[0234] Figure 20 for Figure 17 A network matching diagram of electronic device 2000, first external module 1001 and second external module 1002 in the diagram; Figure 21 for Figure 20 The circuit diagram of the first external module 1001 and the second external module 1002 is shown.

[0235] Please see Figure 20 and Figure 21 In some embodiments, the third coil 310 includes a first connection terminal 311 and a second connection terminal 312, and the first coil 100 includes a first connection terminal 101 and a second connection terminal 102.

[0236] The second switch module 810 includes a fifth switch 811, a sixth switch 812, a seventh switch 813, and an eighth switch 814.

[0237] The fifth switch 811 includes a first terminal and a second terminal. When the fifth switch 811 is in the ON state, the first terminal of the fifth switch 811 is connected to the second terminal of the fifth switch 811. When the fifth switch 811 is in the OFF state, the first terminal of the fifth switch 811 and the second terminal of the fifth switch 811 are connected.

[0238] The sixth switch 812 includes a first terminal, a second terminal, and a third terminal. The first terminal of the sixth switch 812 can be connected to either the second terminal or the third terminal of the sixth switch 812.

[0239] The seventh switch 813 includes a first terminal and a second terminal. When the seventh switch 813 is in the ON state, the first terminal of the seventh switch 813 is connected to the second terminal of the seventh switch 813. When the seventh switch 813 is in the OFF state, the first terminal of the seventh switch 813 and the second terminal of the seventh switch 813 are connected.

[0240] The eighth switch 814 includes a first terminal, a second terminal, and a third terminal. The first terminal of the eighth switch 814 can be connected to either the second terminal or the third terminal of the eighth switch 814.

[0241] The second tuning module 200 of the first external module 1001 includes a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8.

[0242] In the first external module 1001, the first end of the fifth switch 811 and the first end of the sixth switch 812 are connected and connected to the first connection terminal 311 of the third coil 310; the second end of the fifth switch 811 is connected to the sixth capacitor C6, and the second end of the sixth capacitor C6 is connected to ground; the second end of the sixth switch 812 is connected to the first connection terminal 101 of the first coil 100, the third end of the sixth switch 812 is connected to the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is connected to the first connection terminal 101 of the first coil 100; the first end of the seventh switch 813 is connected to the second end of the eighth switch 814 and connected to the second connection terminal 312 of the third coil 310, the second end of the seventh switch 813 is connected to the first end of the eighth capacitor C8, and the second end of the eighth capacitor C8 is grounded; the second end of the eighth switch 814 is connected to the second connection terminal 102 of the first coil 100, the third end of the eighth switch 814 is connected to the first end of the seventh capacitor C7, and the second end of the seventh capacitor C7 is connected to the second connection terminal 102 of the first coil 100.

[0243] When the first external module 1001 and the second external module 1002 are stacked and installed on the electronic device 1000, the fifth switch 811 is open, the seventh switch 813 is open, and the first end of the sixth switch 812 is connected to the second end of the sixth switch 812, and the first end of the eighth switch 814 is connected to the second end of the eighth switch 814, thereby putting the second switch module 810 in the third state. At this time, the sixth capacitor C6 and the eighth capacitor C8 are not connected to the first coil 100 and the third coil 310. Furthermore, the first end of the fifth capacitor C5 and the first end of the seventh capacitor C7 are not connected to the first coil 100 and the third coil 310, thus allowing the second tuning module 200 to be disconnected from the first coil 100.

[0244] With this configuration, when the first external module 1001 and the second external module 1002 are stacked and installed on the electronic device 1000, the second switch module 810 of the first external module 1001 can be in a third state, thereby the second tuning module 200 can be disconnected from the first coil 100, and the first coil 100 can be communicatively coupled with the fourth coil 910, and the two can transmit NFC signals.

[0245] When the first external module 1001 is installed on the electronic device 1000, the fifth switch 811 is turned on, the seventh switch 813 is turned on, and the first end of the sixth switch 812 is connected to the third end of the sixth switch 812 and the first end of the eighth switch 814 is connected to the third end of the eighth switch 814, thereby putting the second switch module 810 in the fourth state. At this time, the sixth capacitor C6 and the eighth capacitor C8 can be connected to the first coil 100 and the third coil 310, and the first end of the fifth capacitor C5 and the first end of the seventh capacitor C7 are not connected to the first coil 100 and the third coil 310. Then, the second tuning module 200 can be connected to the first coil 100 through the second switch module 810 and adjust the resonant frequency of the first coil 100 to the preset frequency, so that the first coil 100 can be used as a radiating antenna.

[0246] For example, the fifth switch 811, the sixth switch 812, the seventh switch 813, and the eighth switch 814 can be connected to the controller 830. The controller 830 can control the state of the fifth switch 811, the sixth switch 812, the seventh switch 813, and the eighth switch 814, thereby the controller 830 can control the state of the second switch module 810.

[0247] When the first external module 1001 and the second external module 1002 are stacked and installed on the electronic device 1000, the controller 830 can control the fifth switch 811 to be turned off, the seventh switch 813 to be turned off, and the first end of the sixth switch 812 to be connected to the second end of the sixth switch 812 and the first end of the eighth switch 814 to be connected to the second end of the eighth switch 814, thereby causing the second switch module 810 to be in the third state.

[0248] When the first external module 1001 is installed on the electronic device 1000, the controller 830 can control the fifth switch 811 to be turned on, the seventh switch 813 to be turned on, and the first end of the sixth switch 812 to be connected to the third end of the sixth switch 812 and the first end of the eighth switch 814 to be connected to the third end of the eighth switch 814, thereby putting the second switch module 810 in the fourth state.

[0249] Please see Figure 21 In some embodiments, the second external module 1002 may further include a third tuning module 930, which is used to adjust the resonant frequency of the fifth coil 920 to a preset frequency.

[0250] The fourth coil 910 includes a first connecting end 911 and a second connecting end 912, and the fifth coil 920 includes a first connecting end 921 and a second connecting end 922.

[0251] The third tuning module 930 includes a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, and a sixteenth capacitor C16.

[0252] One end of the thirteenth capacitor C13 is connected to the first connection terminal 911 of the fourth coil 910, and the other end is connected to the first connection terminal 921 of the fifth coil 920. The number of thirteenth capacitors C13 can be one or more. When there are multiple thirteenth capacitors C13, the multiple thirteenth capacitors C13 are connected in parallel.

[0253] One end of the fourteenth capacitor C14 is connected to the first connection terminal 921 of the fifth coil 920, and the other end is grounded; there can be one or more fourteenth capacitors C14, and if there are multiple fourteenth capacitors C14, the multiple fourteenth capacitors C14 are connected in parallel.

[0254] One end of the fifteenth capacitor C15 is connected to the second connection terminal 912 of the fourth coil 910, and the other end is connected to the second connection terminal 922 of the fifth coil 920; wherein, there can be one or more fifteenth capacitors C15, and if there are multiple fifteenth capacitors C15, the multiple fifteenth capacitors C15 are connected in parallel.

[0255] One end of the sixteenth capacitor C16 is connected to the second connection terminal 922 of the fifth coil 920, and the other end is grounded. There can be one or more sixteenth capacitors C16; if there are multiple sixteenth capacitors C16, they are connected in parallel.

[0256] With this configuration, the second external module 1002, including the thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15, and the sixteenth capacitor C16, can adjust the resonant frequency of the fifth coil 920.

[0257] Please see you later. Figure 16 The fourth coil 910 and the first coil 100 have the same number of turns, and when the first external module 1001 and the second external module 1002 are stacked and mounted on the electronic device 2000, the fourth coil 910 and the first coil 100 overlap in the first direction F1.

[0258] This configuration increases the coupling between the fourth coil 910 and the first coil 100, thereby ensuring effective signal transmission between them and reducing energy attenuation during NFC signal transmission. The transmission of NFC signals between the fourth coil 910 and the first coil 100 can include both transmission from the fourth coil 910 to the first coil 100 and transmission from the first coil 100 to the fourth coil 910.

[0259] Please see you later. Figure 16 In some embodiments, the second external module 1002 further includes a fourth ferrite layer 913 and a fifth ferrite layer 923, wherein the fourth ferrite layer 913 is located on the side of the fourth coil 910 facing the fifth coil 920, and the fifth ferrite layer 923 is located on the side of the fifth coil 920 facing the fourth coil 910.

[0260] This configuration increases the coupling between the fourth coil 910 and the second coil 400, ensuring strong coupling between them, thereby reducing energy attenuation when the NFC signal is transmitted between the fourth coil 910 and the second coil 400.

[0261] In some embodiments, the second external module 1002 may further include a fourth metal layer and a fifth metal layer, wherein the fourth metal layer is disposed on the side of the fourth ferrite layer 913 away from the fourth coil 910, and the fifth metal layer is disposed on the side of the fifth ferrite layer 923 away from the fifth coil 920.

[0262] By setting a fourth metal layer, the influence of the NFC signal in the fourth coil 910 on other devices in the second external module 1002 can be reduced.

[0263] By setting a fifth metal layer, the impact of the NFC signal in the fifth coil 920 on other devices in the second external module 1002 can be reduced.

[0264] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electronic system, characterized in that, include: A first external module and an electronic device, wherein the first external module and the electronic device are detachably connected; The first external module includes: a first coil and a first signal transmission structure, wherein the first signal transmission structure is connected to the first coil; The electronic device includes an NFC chip and a second signal transmission structure, wherein the second signal transmission structure is connected to the NFC chip; When the first external module is installed on the electronic device, the second signal transmission structure is coupled to the first signal transmission structure, and the first coil serves as a radiating antenna.

2. The electronic system according to claim 1, characterized in that, The electronic device further includes a second coil, a first tuning module, and a first switch module, wherein the second coil is connected to the NFC chip, and the first switch module is connected between the first tuning module and the second coil; When the first external module is installed on the electronic device, the first switch module is in the first state, and the first tuning module is disconnected from the second coil. When the first external module is not installed on the electronic device, the first switch module is in the second state, the first tuning module is connected to the second coil, the second coil serves as a radiating antenna, and the first tuning module is used to adjust the resonant frequency of the second coil to a preset frequency.

3. The electronic system according to claim 2, characterized in that, The first tuning module includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; the first switching module includes a first switch, a second switch, a third switch, and a fourth switch; the NFC chip includes a first connection terminal and a second connection terminal. Wherein, the first end of the first switch is connected to the first end of the second switch, and the first ends of the first switch and the first ends of the second switch are connected to the first connection terminal of the NFC chip, the second end of the first switch is connected to one end of the first capacitor, the other end of the first capacitor is grounded, the second end of the second switch is connected to the first connection terminal of the second coil, the third end of the second switch is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the first connection terminal of the second coil; The first end of the third switch is connected to the first end of the fourth switch, and the first ends of the third switch and the fourth switch are connected to the second connection terminal of the NFC chip; the second end of the third switch is connected to one end of the third capacitor, the other end of the third capacitor is grounded, the second end of the fourth switch is connected to the second connection terminal of the second coil, the third end of the fourth switch is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to the second connection terminal of the second coil. When the first external module is installed on the electronic device, the first switch is disconnected, the third switch is disconnected, and the first end of the second switch is connected to the second end of the second switch, and the first end of the fourth switch is connected to the second end of the fourth switch, so that the first switch module is in the first state. When the first external module is not installed on the electronic device, the first switch and the third switch are turned on, and the first end of the second switch is connected to the third end of the second switch, and the first end of the fourth switch is connected to the third end of the fourth switch, so that the first switch module is in the second state.

4. The electronic system according to any one of claims 1-3, characterized in that, The first signal transmission structure includes a first connector, and the second signal transmission structure is a second connector; When the first external module is installed on the electronic device, the first connector is electrically connected to the second connector.

5. The electronic system according to claim 2 or 3, characterized in that, The first signal transmission structure includes a third coil, and the second coil serves as the second signal transmission structure; When the first external module is installed on the electronic device, the third coil is communicatively coupled to the second coil.

6. The electronic system according to claim 5, characterized in that, The third coil has the same number of turns as the second coil, and when the first external module is installed on the electronic device, the third coil and the second coil overlap in a first direction, wherein the first direction is perpendicular to the plane in which the second coil is located.

7. The electronic system according to claim 5 or 6, characterized in that, When the first external module is installed on the electronic device, the first coil is located on the side of the third coil away from the second coil.

8. The electronic system according to any one of claims 5-7, characterized in that, The first external module further includes a first ferrite layer and a third ferrite layer, and the electronic device includes a second ferrite layer, wherein the first ferrite layer is located on the side of the first coil facing the third coil, the second ferrite layer is located on the side of the second coil away from the first coil, and the third ferrite layer is located on the side of the third coil facing the first coil.

9. The electronic system according to claim 8, characterized in that, The first external module further includes: a first metal layer and / or a third metal layer, wherein the first metal layer is disposed on the surface of the first ferrite layer opposite to the first coil, and at least one of the surfaces of the third ferrite layer opposite to the third coil is provided with the metal layer; and / or, The electronic device further includes a second metal layer disposed on the surface of the second ferrite layer opposite to the second coil.

10. The electronic system according to any one of claims 1-9, characterized in that, The first coil includes a first connection terminal and a second connection terminal, and the first signal transmission structure includes a first connection terminal and a second connection terminal; The first external module further includes: a second tuning module, which is connected to the first coil. The second tuning module is used to adjust the resonant frequency of the first coil to a preset frequency. The second tuning module includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor. One end of the fifth capacitor is connected to a first connection terminal of the first coil, and the other end is connected to a first connection terminal of the first signal transmission structure. One end of the sixth capacitor is connected to the first connection terminal of the first coil, and the other end is grounded. One end of the seventh capacitor is connected to a second connection terminal of the first coil, and the other end is connected to a second connection terminal of the first signal transmission structure. One end of the eighth capacitor is connected to the second connection terminal of the first coil, and the other end is grounded.

11. The electronic system according to any one of claims 5-9, characterized in that, The electronic system further includes: a second external module, the second external module including a fourth coil and a fifth coil, the fourth coil being connected to the fifth coil; The first external module also includes a second switch module and a second tuning module, wherein the second switch module is connected between the second tuning module and the first coil; When the second external module and the first external module are stacked and installed on the electronic device, the second external module is located on the side of the first external module away from the electronic device; the second switch module is in the third state, and when the second switch module is in the third state, the second tuning module is disconnected from the first coil; the fourth coil is communicatively coupled to the first coil, and the fifth coil serves as a radiating antenna; When the second external module is installed on the electronic device, the fourth coil is communicatively coupled to the second coil, and the fifth coil serves as a radiating antenna. When the first external module is installed on the electronic device, the second switch module is in the fourth state. When the second switch module is in the fourth state, the second tuning module is connected to the first coil through the second switch module. The second tuning module is used to adjust the resonant frequency of the first coil to a preset frequency.

12. The electronic system according to claim 11, characterized in that, The third coil includes a first connection end and a second connection end, and the first coil includes a first connection end and a second connection end; The second switch module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch; The second tuning module includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor; The first end of the fifth switch is connected to the first end of the sixth switch and is connected to the first connection end of the third coil; the second end of the fifth switch is connected to the first end of the sixth capacitor, and the second end of the sixth capacitor is connected to ground; the second end of the sixth switch is connected to the first connection end of the first coil, the third end of the sixth switch is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is connected to the first connection end of the first coil; the first end of the seventh switch is connected to the second end of the eighth switch and is connected to the second connection end of the third coil; the second end of the seventh switch is connected to the first end of the eighth capacitor, and the second end of the eighth capacitor is grounded; the second end of the eighth switch is connected to the second connection end of the first coil, the third end of the eighth switch is connected to the first end of the seventh capacitor, and the second end of the seventh capacitor is connected to the second connection end of the first coil; When the second switch module is in the third state, the fifth switch is off, the seventh switch is off, and the first end of the sixth switch is connected to the second end of the sixth switch and the first end of the eighth switch is connected to the second end of the eighth switch; When the second switch module is in the fourth state, the fifth switch is turned on, the seventh switch is turned on, and the first end of the sixth switch is connected to the third end of the sixth switch, and the first end of the eighth switch is connected to the third end of the eighth switch.

13. An external device configured for detachable connection to an electronic device, characterized in that, include: A first external module, comprising: a first coil and a first signal transmission structure, wherein the first signal transmission structure is used to couple with a second signal transmission structure of an electronic device, and the first signal transmission structure is also connected to the first coil; When the first external module is installed on the electronic device, the second signal transmission structure is coupled to the first signal transmission structure, and the first coil serves as a radiating antenna.

14. The external device according to claim 13, characterized in that, The first signal transmission structure includes a first connector for electrical connection with a second connector of the electronic device.

15. The external device according to claim 13, characterized in that, The first signal transmission structure includes a third coil, which is used to couple with the second coil of the electronic device.

16. The external device according to claim 15, characterized in that, The first external module further includes a first ferrite layer and a third ferrite layer, wherein the first ferrite layer is located on the side of the first coil facing the third coil, and the third ferrite layer is located on the side of the third coil facing the first coil.

17. The external device according to claim 16, characterized in that, The first external module further includes: a first metal layer and / or a third metal layer, wherein the first metal layer is disposed on the surface of the first ferrite layer opposite to the first coil, and the third metal layer is disposed on the surface of the third ferrite layer opposite to the third coil.

18. The external device according to any one of claims 13-17, characterized in that, The first coil includes a first connection terminal and a second connection terminal, and the first signal transmission structure includes a first connection terminal and a second connection terminal; The first external module further includes: a second tuning module, which is connected to the first coil. The second tuning module is used to adjust the resonant frequency of the first coil to a preset frequency. The second tuning module includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor. One end of the fifth capacitor is connected to a first connection terminal of the first coil, and the other end is connected to a first connection terminal of the first signal transmission structure. One end of the sixth capacitor is connected to the first connection terminal of the first coil, and the other end is grounded. One end of the seventh capacitor is connected to a second connection terminal of the first coil, and the other end is connected to a second connection terminal of the first signal transmission structure. One end of the eighth capacitor is connected to the second connection terminal of the first coil, and the other end is grounded.

19. The external device according to any one of claims 15-17, characterized in that, Also includes: A second external module is configured to be detachably connected to the first external module or the electronic device, wherein the second external module includes a fourth coil and a fifth coil, the fourth coil being used for communicative coupling with the first coil, and the fifth coil being connected to the fourth coil; The first external module further includes: a second switch module and a second tuning module, wherein the second switch module is connected between the second tuning module and the first coil; When the second external module and the first external module are stacked and installed on the electronic device, the second external module is located on the side of the first external module away from the electronic device; the second switch module is in the third state, and when the second switch module is in the third state, the second tuning module is disconnected from the first coil; the fourth coil is communicatively coupled to the first coil, and the fifth coil serves as a radiating antenna; When the second external module is installed on the electronic device, the fourth coil is communicatively coupled to the second coil, and the fifth coil serves as a radiating antenna. When the first external module is installed on the electronic device, the second switch module is in the fourth state. When the second switch module is in the fourth state, the second tuning module is connected to the first coil through the second switch module. The second tuning module is used to adjust the resonant frequency of the first coil to a preset frequency.

20. An electronic device, characterized in that, include: An NFC chip and a second signal transmission structure are provided, wherein the second signal transmission structure is connected to the NFC chip and is used to couple with the first signal transmission structure of the first external module of the external device.

21. The electronic device according to claim 20, characterized in that, The electronic device further includes: a second coil, a first tuning module, and a first switch module, wherein the second coil is connected to the NFC chip, and the first switch module is connected between the first tuning module and the second coil; When the first switch module is in the first state, the first tuning module is disconnected from the second coil; When the first switch module is in the second state, the first tuning module is connected to the second coil, the second coil serves as a radiating antenna, and the first tuning module is used to adjust the resonant frequency of the second coil to a preset frequency.

22. The electronic device according to claim 20 or 21, characterized in that, The second signal transmission structure includes a second connector, which is used for electrical connection with the first connector of the first external module.

23. The electronic device according to claim 21, characterized in that, The second coil serves as the second signal transmission structure and is used for communication coupling to the third coil of the first external module or the fourth coil of the second external module of the external device.

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