Electronic device and detection method

Abstract

The application discloses an electronic device and a detection method. The electronic device comprises an SAR antenna, an NFC antenna, an NFC chip, an SAR chip, a controller and a selection switch. The controller is connected with the NFC chip and the SAR chip respectively. The NFC chip and the SAR chip are connected with the selection switch. The selection switch is connected with the NFC antenna and the SAR antenna. In the initial state, the controller controls the selection switch to connect the NFC chip and the NFC antenna. The NFC chip determines a target object to be detected according to the signal detected by the NFC antenna. In the case that the target object is an NFC card, the controller controls the selection switch to connect the NFC chip with the NFC antenna and / or the SAR antenna to read the NFC card. In the case that the target object is not an NFC card, the controller controls the selection switch to connect the SAR chip with the NFC antenna and / or the SAR antenna to perform SAR detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of terminal equipment, and in particular to an electronic device and a detection method. BACKGROUND

[0002] Near Field Communication (NFC) is a mature technology configuration on electronic devices, and is mainly used in scenarios such as user access cards, transportation cards, and identity cards. In the NFC card detection function of an electronic device, a low-power card detection technology is applied to periodically send short radio frequency pulses, and whether an object is close is determined by detecting the change in the oscillation voltage of the radio frequency pulses formed on the NFC coil. The Specific Absorption Rate (SAR) refers to the electromagnetic power absorbed or consumed by a unit mass of human tissue. In order to reduce the harm of electromagnetic waves to the human body, the antenna transmission power of the electronic device is appropriately reduced when the electronic device is close to the human body, and the SAR sensor is used to detect whether the electronic device is close to the human body.

[0003] In some scenarios, in order to realize the NFC function and the SAR function on the electronic device, the NFC detection system and the SAR detection system are independently configured on the electronic device, and the NFC detection system and the SAR detection system work independently to realize the NFC function and the SAR function. As such, when the NFC detection system and the SAR detection system work independently, they will interfere with each other, resulting in low detection accuracy of the NFC detection system and the SAR detection system. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide an electronic device and a detection method, which can solve the problem of low detection accuracy of the NFC detection system and the SAR detection system.

[0005] In a first aspect, the embodiments of the present application provide an electronic device, comprising: an SAR antenna, an NFC antenna, an NFC chip, an SAR chip, a controller and a selection switch; the controller is connected with the NFC chip and the SAR chip respectively; the NFC chip and the SAR chip are connected with the selection switch, and the selection switch is connected with the NFC antenna and the SAR antenna; in an initial state, the controller controls the selection switch to connect the NFC chip and the NFC antenna, and the NFC chip determines a target object to be detected according to a signal detected by the NFC antenna; in a case where the target object is the NFC card, the controller controls the selection switch to connect the NFC chip with the NFC antenna and / or the SAR antenna to read the NFC card; in a case where the target object is not the NFC card, the controller controls the selection switch to connect the SAR chip with the NFC antenna and / or the SAR antenna to perform SAR detection.

[0006] It can be seen that, by determining the target object to be detected by the NFC chip according to the signal detected by the NFC antenna, in a case where the target object is the NFC card, the controller can control the selection switch to connect the NFC chip with the NFC antenna and / or the SAR antenna to read the NFC card, and in a case where the target object is not the NFC card, the controller can control the selection switch to connect the SAR chip with the NFC antenna and / or the SAR antenna to perform SAR detection. In this way, by switching of the selection switch, the NFC antenna and / or the SAR antenna can be uniformly configured as an antenna for implementing NFC function, which not only expands the card reading area of NFC, but also avoids interference caused by independent and simultaneous NFC detection and SAR detection, and the NFC antenna and / or the SAR antenna can be configured as an antenna for implementing SAR detection, which avoids independent configuration of an NFC detection system for performing NFC detection and an SAR detection system for performing SAR detection, and eliminates interference.

[0007] In a second aspect, the embodiments of the present application provide a detection method, comprising: determining a target object to be detected by an NFC chip according to a signal detected by an NFC antenna; in a case where the target object is an NFC card, controlling a selection switch to connect the NFC chip with the NFC antenna and / or an SAR antenna to read the NFC card; in a case where the target object is not the NFC card, controlling the selection switch to connect an SAR chip with the NFC antenna and / or the SAR antenna to perform SAR detection.

[0008] It can be seen that, by selecting the switching of the switch, the NFC antenna and / or the SAR antenna can be configured as an antenna for implementing NFC function, which not only expands the card reading area of NFC, but also avoids the interference problem caused by the independent implementation of NFC detection and SAR detection. In addition, the NFC antenna and / or the SAR antenna can be configured as an antenna for implementing SAR detection, which avoids the independent configuration of the NFC detection system for NFC detection and the SAR detection system for SAR detection, and eliminates the interference. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 A structural schematic diagram of an electronic device provided by an embodiment of the present application is shown.

[0010] Figure 2 A distribution schematic diagram of various components of an electronic device provided by an embodiment of the present application on the electronic device is shown.

[0011] Figure 3 A flow schematic diagram of the internal implementation of an electronic device provided by an embodiment of the present application is shown.

[0012] Figure 4 A flow schematic diagram of a detection method provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be described clearly in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0014] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents a "or" relationship between the front and rear associated objects.

[0015] The technical solutions in the embodiments of the present application will be described clearly in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application. Figures 1 to 3 The electronic device provided by the embodiments of the present application will be described in detail in combination with specific embodiments and application scenarios, wherein the electronic device can be a mobile phone, a notebook computer, a palm computer, etc.

[0016] Please refer to the attached drawings Figures 1-3 The electronic device 10 comprises a SAR antenna 100, an NFC antenna 101, an NFC chip 102, a SAR chip 103, a controller 104 and a selection switch 105.

[0017] The controller 104 is connected with the NFC chip 102 and the SAR chip 103 respectively, the NFC chip 102 and the SAR chip 103 are connected with the selection switch 105, and the selection switch 105 is connected with at least one antenna.

[0018] In the initial state, the controller 104 controls the selection switch 105 to connect the NFC chip 102 and the NFC antenna 101, and the NFC chip 102 determines the target object to be detected according to the signal detected by the NFC antenna 101.

[0019] In the case that the target object is an NFC card, the controller 104 controls the selection switch 105 to connect the NFC chip 102 with the NFC antenna 101 and / or the SAR antenna 100 to read the NFC card, and in the case that the target object is not an NFC card, the controller 104 controls the selection switch 105 to connect the SAR chip 103 with the NFC antenna 101 and / or the SAR antenna 100 to perform SAR detection.

[0020] In particular, the controller is responsible for the running of the software system of the electronic device, the implementation of the functions of the electronic device, the control of peripheral devices, including but not limited to the NFC chip 102, the SAR chip 103, and the selection switch 105, etc. The NFC chip 102 is an integrated circuit with a microcontroller unit (MCU) and a radio frequency modem inside, mainly used to implement near field communication functions such as card reading, card simulation, and other NFC functions, and the NFC chip 102 also has a low power card detection (LPCD) function, which can accurately detect the antenna detuning when an object is close to the electronic device. The SAR chip 103 can cooperate with at least one antenna to form a change in capacitance on the antenna based on the proximity between the antenna and the external object, realizing a proximity detection integrated circuit. A SAR chip 103 can have a single or multiple ADC detection channels, i.e., a SAR chip 103 can be equipped with multiple antennas. The selection switch 105 can be a switch tube group, which can include two switch tubes in a switch tube group, one of which is connected to the NFC chip 102, and the other of which can be connected to the SAR chip 103. In the case of a target object being an NFC card, the controller 104 sends a first control signal to the selection switch 105 to control the selection switch 105 to connect the NFC chip 102 and the antennas. In the case of a target object being other than an NFC card, the controller 104 sends a second control signal to control the selection switch 105 to connect the SAR chip 103 and the NFC antenna and / or the SAR antenna. In the case of a target object being an NFC card, the controller 104 sends a first control signal to the switch tube connected to the NFC chip 102 to connect the NFC chip 102 and the NFC antenna 101 and / or the SAR antenna 100. In the case of a target object being other than an NFC card, the controller 104 sends a second control signal to the switch tube connected to the SAR chip 103 to connect the SAR chip 103 and the NFC antenna 101 and / or the SAR antenna 100. The antenna can be a coil, and the shape of the coil can be circular, square, etc., which is not limited in the embodiments of the present application.

[0021] Further, the number of selection switches 105 can be consistent with the total number of NFC antennas 101 and SAR antennas 100, i.e., one NFC antenna 101 corresponds to one selection switch 105, and one SAR antenna 100 corresponds to one selection switch 105, thereby improving the accuracy of the selection switch 105 in selecting the connected antenna.

[0022] In a possible implementation, the NFC chip 102 determines the target object to be detected according to the signal detected by the NFC antenna 101, including: the NFC chip 102 determines the target object to be detected according to the voltage signal detected by the NFC antenna 101, wherein, in a case where the voltage signal is greater than a first threshold, it is determined that there is a target object close to the electronic device, and in a case where the voltage signal is a feedback signal of a radio frequency signal emitted by the target object to be detected to the NFC antenna, it is determined that the target object to be detected is the NFC card.

[0023] Specifically, the NFC chip 102 is an integrated circuit, which has an MCU and a radio frequency modem inside, for realizing near field communication functions such as card reading function, card simulation and other NFC functions, and the NFC chip 102 also has an LPCD function, which can accurately detect the case that the antenna is out of tune after an object is close to the electronic device. For the NFC chip 102, in an initial state, the voltage signal of the antenna received by an RX interface can be detected as a reference value (a first threshold), and subsequently, the voltage signal of the antenna received by the RX interface can be periodically detected. When the voltage signal exceeds the reference value, it is determined that there is a target object close to the electronic device. The target object close to the electronic device means that the target object is in a detectable range of the electronic device. In a case where the voltage signal gradually increases, it indicates that the target object is gradually close to the electronic device. In a case where the voltage signal gradually decreases, it indicates that the target object is gradually away from the electronic device. Then, the NFC chip and the antenna emit a complete card detection command, and it is judged whether there is an NFC card responding to the command and feeding back a signal. If there is an NFC card responding to the command and returning a feedback signal, it is determined that the target object to be detected is an NFC card and continues to communicate with the NFC card. If there is no NFC card responding to the command, the NFC chip 102 returns to an LPCD low-power mode.

[0024] In a possible implementation, the NFC chip 102 further includes an antenna matching circuit, one end of the NFC chip 102 is connected with the controller 104, the other end of the NFC chip 102 is connected with one end of the antenna matching circuit, and the other end of the antenna matching circuit is connected with the selection switch 105. In a case where the target object is an NFC card, the controller 104 controls the NFC chip 102 and the antenna matching circuit to emit a radio frequency signal through the NFC antenna 101 and / or the SAR antenna 100 to communicate with the NFC card.

[0025] Specifically, the antenna matching circuit can be an NFC matching circuit, which is used to make the radio frequency signal energy output by the NFC chip 102 be transmitted to the NFC antenna 101 and / or the SAR antenna 100 with the highest efficiency. The NFC matching circuit can be composed of a plurality of capacitors. In the case that the target object is an NFC card, the controller 104 controls the NFC chip 102 to emit a radio frequency signal, which is transmitted through the NFC antenna 101 and / or the SAR antenna 100 after passing through the antenna matching circuit.

[0026] In a possible implementation, the controller 104 controls the selection switch 105 to connect the SAR chip 103 with the NFC antenna 101 and / or the SAR antenna 100 for SAR detection, which includes that, when the selection switch 105 connects the SAR chip 103 with the NFC antenna 101 and / or the SAR antenna 100, the SAR chip 103 performs SAR detection by acquiring the capacitance value of the NFC antenna 101 and / or the SAR antenna 100, and the SAR detection indicates that the target object is close to or away from the electronic device. In the case that the capacitance value gradually increases, it is determined that the target object is gradually close to the electronic device, and in the case that the capacitance value gradually decreases, it is determined that the target object is gradually away from the electronic device.

[0027] Specifically, the SAR chip 103 can be integrated with an antenna to realize proximity detection by relying on the change of the capacitance formed between the NFC antenna 101 and / or the SAR antenna 100 and the target object. Generally, the SAR chip 103 can have a single or multiple ADC detection channels, that is, one SAR chip 103 can be connected with multiple antennas. Generally, a certain capacitance is formed between the antenna and the target object, and the capacitance value on the antenna changes with the type of the target object, the distance between the target object and the electronic device, and the area of the target object. The changed capacitance value can be detected by the ADC detection channel of the SAR chip 103. The closer the distance between the target object and the electronic device, the larger the capacitance value on the antenna. The farther the distance between the target object and the electronic device, the smaller the capacitance value on the antenna. A threshold value can be set. When the SAR chip 103 acquires the capacitance value on the antenna to be greater than the threshold value, it indicates that the target object is within the detectable range of the electronic device, that is, the target object is close to the electronic device.

[0028] By the electronic device disclosed by the embodiment of the present application, the target object to be detected is determined by the NFC chip according to the signal detected by the NFC antenna. In the case that the target object is an NFC card, the NFC chip and the NFC antenna and / or the SAR antenna are connected by the controller to control the selection switch to read the NFC card. In the case that the target object is not an NFC card, the SAR chip and the NFC antenna and / or the SAR antenna are connected by the controller to control the selection switch to perform SAR detection. In this way, by switching the selection switch, the NFC antenna and / or the SAR antenna can be uniformly configured as an antenna for implementing NFC function. Not only the card reading area of NFC can be expanded, but also the interference problem caused by independent SAR detection and NFC detection can be avoided. Furthermore, the NFC antenna and / or the SAR antenna can be configured as an antenna for implementing SAR detection. The NFC detection system and the SAR detection system for independent configuration are avoided, and the interference is eliminated.

[0029] In the following, taking two antennas as an example, the NFC antenna and the SAR antenna are combined with the drawings Figure 2 The technical solutions of the electronic device mentioned above are further described.

[0030] Please refer to Figure 2 On the back of the electronic device, the camera module 201, the NFC antenna 202, the SAR antenna 203, the NFC chip 102, the SAR chip 103 and the selection switch 105 are arranged in the electronic device, such as Figure 2 The NFC antenna 202 is arranged at the upper position of the electronic device, and the SAR antenna 203 is arranged at the lower position of the electronic device, so as to ensure that the distance between the NFC antenna 202 and the SAR antenna 203 is large, and the mutual interference of the two antennas is avoided.

[0031] Please refer to Figure 3, the selection switch 105 is set to two, Switch1 and Switch2, Switch1 connects the NFC antenna 202, Switch2 connects the SAR antenna 203, and the antenna matching circuit is also set to two, antenna matching circuit 1 and antenna matching circuit 2, wherein the controller 104 is connected with the NFC chip 102 through the serial peripheral interface (Serial Peripheral Interface, SPI), and the two communicate through the bus (Inter-Integrated Circuit, I2C). The NFC chip 102 is connected with the antenna matching circuit 1 and the antenna matching circuit 2 respectively, the antenna matching circuit 1 is connected with the A end of Switch1, the antenna matching circuit 2 is connected with the C end of Switch2; the controller 104 is connected with one end of the SAR chip 103, the path 1 of the SAR chip 103 is connected with the D end of Switch2, the path 2 of the SAR chip 103 is connected with the B end of Switch1, the A' end of Switch1 is connected with the antenna 202, and the D' of Switch1 is connected with the antenna 203.

[0032] In the initial state, the AA' of Switch1 is turned on to NFC antenna 202, antenna matching circuit 1 and NFC chip 102, which is used for NFC function, and the DD' of Switch2 is turned on to SAR antenna 203 and SAR chip 103, which is used for SAR detection function. In the initial state, the NFC chip 102 obtains the voltage signal generated by the NFC antenna 202 as a reference value through the read interface, and in the subsequent process, the NFC chip 102 periodically obtains the voltage signal generated by the NFC antenna 202 through the read interface. When the voltage signal exceeds the first threshold value, it means that the target object is close to the electronic device, such as a person's hand, face and NFC card close to the electronic device. If the voltage signal exceeds the first threshold value and gradually increases, it means that the target object is closer and closer to the electronic device. If the voltage signal gradually decreases in the subsequent process, it means that the target object is gradually away from the electronic device.

[0033] When the target object gradually approaches the electronic device, a complete card reading and checking process needs to be performed to determine whether the target object is an NFC card. If the NFC chip 102 and the NFC antenna 202 can perform a complete card checking process with the target object, it is determined that the target object is an NFC card. The controller 104 sends a control signal to switch2 to switch from DD' to CD'. The SAR antenna 203 is connected to the antenna matching circuit 2 and the NFC chip 102 through the CD' path, and the NFC reading area below is added. The SAR antenna 203, the antenna matching circuit 1 and the NFC chip 102 realize the NFC detection of the entire electronic device. After the NFC card reading is completed, the NFC chip 102 returns to the initial low-power detection mode, and switch2 is switched from CD' to DD' to continue the SAR detection function.

[0034] If the NFC chip 102 and the NFC antenna 202 cannot perform a complete card checking process with the target object, it is determined that the target object is not an NFC card, such as a human hand or face. The controller 104 sends a control signal to Switch1 to switch from AA' to BA'. The NFC antenna 202 is connected to the SAR chip 103 through the BA' path for SAR detection function. The antenna 203 and the SAR chip 103 realize the SAR detection of the entire electronic device. The SAR detection is to reduce the emission power of the antenna of the electronic device to reduce the harm to the human body when the human body approaches the electronic device. The detection of whether the human body approaches the electronic device is determined by the change of the capacitance on the antenna. If the capacitance generated by the NFC antenna 202 is greater than a threshold value, it is determined that the human body approaches the position of the NFC antenna 202 of the electronic device, and the emission function of the NFC antenna 202 is reduced accordingly. If the capacitance generated by the SAR antenna 203 is greater than a threshold value, it is determined that the human body approaches the position of the SAR antenna 203 of the electronic device, and the emission power of the SAR antenna 203 is reduced accordingly to protect the human body from harm.

[0035] The following will be described in conjunction with the accompanying drawings Figure 4 The detection method disclosed in the embodiments of the present application will be described as follows. Figure 4 As shown in the drawings, the detection method disclosed in the embodiments of the present application comprises:

[0036] Step S401: determining a target object to be detected by the NFC chip according to the signal detected by the NFC antenna.

[0037] Specifically, the step S401 comprises: acquiring, by the NFC chip, a voltage signal detected by the NFC antenna, detecting the target object to be detected based on the voltage signal; in a case that the voltage signal is greater than a first threshold value, determining that the target object exists close to the electronic device, and in a case that the voltage signal is a feedback signal of a radio frequency signal emitted by the target object to be detected to the NFC antenna, determining that the target object to be detected is the NFC card. The step S403 comprises: in a case that the target object is the NFC card, controlling the selection switch to connect the NFC chip with the NFC antenna and / or the SAR antenna to read the NFC card; and in a case that the target object is not the NFC card, controlling the selection switch to connect the SAR chip with the NFC antenna and / or the SAR antenna to perform SAR detection.

[0038] Specifically, the controlling the selection switch to connect the SAR chip with the NFC antenna and / or the SAR antenna to perform SAR detection comprises: acquiring, by the SAR chip, a capacitance value of the NFC antenna and / or the SAR antenna; performing SAR detection based on the capacitance value; in a case that the capacitance value gradually increases, determining that the target object gradually approaches the electronic device; and in a case that the capacitance value gradually decreases, determining that the target object gradually moves away from the electronic device.

[0039] It is worth noting that the detection method provided by the embodiments of the present application can be mutually referred to the same or similar parts of the electronic device provided by the above embodiments, which will not be described here again.

[0040] By the technical solutions disclosed by the embodiments of the present application, through the switching of the selection switch, the NFC antenna and / or the SAR antenna can be uniformly configured as an antenna for implementing NFC function, which not only can expand the card reading area of NFC, but also avoids the interference problem caused by the independent and common performance of NFC detection and SAR detection. Furthermore, the NFC antenna and / or the SAR antenna can be configured as an antenna for implementing SAR detection, which avoids the independent configuration of the NFC detection system for performing NFC detection and the SAR detection system for performing SAR detection, and eliminates the interference.

[0041] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by more than one process, method, article, or apparatus either simultaneously, concurrently, or with intervening action that are carried out at the same time, either in a simultaneous fashion or in a fashion that is interleaved in time. For example, the described methods can be performed in a different order from that described, and / or various steps can be combined or omitted, and / or additional steps can be added, without departing from the scope of the described methods. Also, features described with respect to certain examples can be combined in other examples.

[0042] From the above description of the embodiments, it is apparent that the method of the above-described embodiments can be realized by means of software and general-purpose hardware platforms. Of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such an understanding, the technical solutions of the present application, essentially or in other words, the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a number of instructions to make a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) execute the methods of various embodiments of the present application.

[0043] The embodiments of the present application are described above in conjunction with the drawings, but the present application is not limited to the above-described specific embodiments, which are merely illustrative rather than restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims.

Claims

1. An electronic device, characterized in that, include: SAR antenna, NFC antenna, NFC chip, SAR chip, controller, and selector switch; The controller is connected to the NFC chip and the SAR chip respectively; Both the NFC chip and the SAR chip are connected to the selection switch, and the selection switch is connected to the NFC antenna and the SAR antenna. In the initial state, the controller controls the selection switch to connect the NFC chip and the NFC antenna, and controls the selection switch to connect the SAR chip and the SAR antenna. The NFC chip determines the target object to be detected based on the signal detected by the NFC antenna. When the target object is an NFC card, the controller controls the selection switch to connect the NFC chip to the NFC antenna and the SAR antenna, and to disconnect the SAR chip from the SAR antenna in order to read the NFC card; If the target object is not the NFC card, the controller controls the selection switch to connect the SAR chip to the NFC antenna and the SAR antenna, and disconnect the NFC chip from the NFC antenna to perform SAR detection; The SAR antenna and the NFC antenna are located at different positions in the electronic device.

2. The electronic device according to claim 1, characterized in that, The NFC chip determines the target object to be detected based on the signal detected by the NFC antenna, including: The NFC chip determines the target object to be detected based on the voltage signal detected by the NFC antenna. When the voltage signal is greater than a first threshold, it is determined that a target object is close to the electronic device. When the voltage signal is a feedback signal of the radio frequency signal emitted by the target object to the NFC antenna, the target object to be detected is determined to be the NFC card.

3. The electronic device according to claim 2, characterized in that, The electronic device further includes: an antenna matching circuit; One end of the NFC chip is connected to the controller, and the other end of the NFC chip is connected to one end of the antenna matching circuit, and the other end of the antenna matching circuit is connected to the selection switch; When the target object is an NFC card, the controller controls the NFC chip and the antenna matching circuit to transmit radio frequency signals through the NFC antenna and / or the SAR antenna to communicate with the NFC card.

4. The electronic device according to claim 1, characterized in that, The controller controls the selection switch to connect the SAR chip to the NFC antenna and the SAR antenna, and to disconnect the NFC chip from the NFC antenna for SAR detection, including: when the selection switch connects the SAR chip to the NFC antenna and the SAR antenna, the SAR chip performs SAR detection by acquiring the capacitance values ​​of the NFC antenna and the SAR antenna; When the capacitance value gradually increases, it is determined that the target object is gradually moving closer to the electronic device; when the capacitance value gradually decreases, it is determined that the target object is gradually moving away from the electronic device.

5. The electronic device according to claim 1, characterized in that, The NFC antenna and the SAR antenna both include coils.

6. The electronic device according to claim 1, characterized in that, One of the NFC antennas is connected to a selection switch, and one of the SAR antennas is connected to a selection switch.

7. The electronic device according to claim 1, characterized in that, When the target object is an NFC card, the controller sends a first control signal to the selection switch to control the selection switch to connect the NFC chip with the NFC antenna and the SAR antenna; If the target object is not the NFC card, the controller sends a second control signal to the selection switch to control the selection switch to connect the SAR chip with the NFC antenna and the SAR antenna.

8. A detection method, characterized in that, Based on the electronic device of claim 1, the detection method includes: The target object to be detected is determined by the NFC chip based on the signal detected by the NFC antenna. When the target object is an NFC card, the control selector switch connects the NFC chip to the NFC antenna and the SAR antenna, and disconnects the SAR chip from the SAR antenna to read the NFC card; If the target object is not the NFC card, the selection switch is controlled to connect the SAR chip to the NFC antenna and the SAR antenna, and to disconnect the NFC chip from the NFC antenna to perform SAR detection.

9. The detection method according to claim 8, characterized in that, The process of determining the target object to be detected based on the signal detected by the NFC antenna using the NFC chip includes: The voltage signal detected by the NFC antenna is obtained through the NFC chip, and the target object to be detected is detected based on the voltage signal; If the voltage signal is greater than a first threshold, it is determined that a target object is near the electronic device. If the voltage signal is a feedback signal of the radio frequency signal emitted by the target object to the NFC antenna, the target object to be detected is determined to be the NFC card.

10. The detection method according to claim 8, characterized in that, The control of the selection switch to connect the SAR chip with the NFC antenna and the SAR antenna for SAR detection includes: The capacitance values ​​of the NFC antenna and the SAR antenna are obtained through the SAR chip; SAR detection is performed based on the capacitance value; When the capacitance value gradually increases, it is determined that the target object is gradually moving closer to the electronic device; when the capacitance value gradually decreases, it is determined that the target object is gradually moving away from the electronic device.

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