Sar detection component and detection method, electronic device

Abstract

The present disclosure relates to the technical field of electronic equipment, in particular to a SAR detection module and method and electronic equipment, the SAR detection module comprises: an induction branch, a detection branch, a SAR sensor and a compensation branch, the induction branch is used for inducting a capacitance signal; a first end of the detection branch is connected with the induction branch, the detection branch inducts environmental noise to generate a first noise signal; the SAR sensor is connected with a second end of the detection branch, the capacitance signal and the first noise signal are transmitted to the SAR detection unit through the detection branch; a first end of the compensation branch is connected with a reference power supply end, a second end of the compensation branch is connected with the SAR sensor, the compensation branch is used for inducting environmental noise to generate a second noise signal and transmitting the second noise signal to the SAR sensor, the second noise signal is used for simulating the first noise signal, so as to compensate the signal transmitted to the SAR sensor by the detection branch by using the second noise signal. The SAR detection precision of the electronic equipment can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of electronic equipment technology, and more specifically, to a SAR detection component and detection method, and an electronic device. Background Technology

[0002] With technological advancements, the application of 5G mobile terminals is becoming increasingly widespread. 5G mobile terminals contain a large number of antennas, and SAR (Specific Absorption Rate) compliance requirements are stringent. To avoid exceeding SAR limits, related technologies utilize SAR sensors to detect changes in capacitance on sensing stubs within electronic devices, thereby determining the positional relationship between the human body and the electronic device. While the sensing stubs and SAR sensors are electrically connected, when the distance between them is significant, environmental influences can easily introduce errors into the SAR sensor's detection results, reducing detection accuracy.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this disclosure is to provide a SAR detection component, detection method, and electronic device, thereby improving the detection accuracy of SAR to at least a certain extent.

[0005] According to a first aspect of this disclosure, a SAR detection component is provided, the SAR detection component comprising:

[0006] Sensing stub, the sensing stub being used to sense and generate a capacitance signal;

[0007] A detection branch, the first end of which is connected to the sensing stub, the detection branch is used to transmit the capacitance signal, and the detection branch senses ambient noise to generate a first noise signal;

[0008] A SAR sensor, wherein the SAR sensor and the second end of the detection branch are connected, and the capacitance signal and the first noise signal are transmitted to the SAR sensor through the detection branch; and

[0009] A compensation branch is provided, with its first end connected to a reference power supply and its second end connected to the SAR sensor. The compensation branch is used to sense ambient noise, generate a second noise signal, and transmit the second noise signal to the SAR sensor. The second noise signal is used to simulate the first noise signal, so as to compensate the signal transmitted from the detection branch to the SAR sensor using the second noise signal.

[0010] According to a second aspect of this disclosure, a SAR detection method is provided for the aforementioned SAR detection component, the SAR detection method comprising:

[0011] Acquire the signal transmitted from the detection branch to the SAR sensor, wherein the signal transmitted from the detection branch to the SAR sensor includes a capacitance signal and a first noise signal;

[0012] Acquire the second noise signal transmitted from the compensation branch to the SAR sensor;

[0013] The signal transmitted from the detection branch to the SAR sensor is compensated based on the second noise signal to determine the capacitance signal sensed by the sensing branch.

[0014] According to a third aspect of this disclosure, an electronic device is provided, the electronic device including the SAR detection component described above.

[0015] The SAR detection component provided in this embodiment transmits the capacitance signal sensed by the sensing stub to the SAR sensor via a detection branch. A compensation branch senses ambient noise and generates a second noise signal, which is then transmitted to the SAR sensor. This second noise signal simulates the first noise signal generated by the detection branch in response to ambient noise. By compensating the signal transmitted from the detection branch to the SAR sensor with the second noise signal, the first noise signal is separated, thereby improving the detection accuracy of the SAR detection component. Furthermore, it allows sensing stubs to be placed at a distance from the SAR sensor, enabling the SAR sensor to connect to sensing stubs at multiple locations.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 A schematic diagram of a first SAR detection component provided for an exemplary embodiment of this disclosure;

[0019] Figure 2 A schematic diagram of a second SAR detection component provided as an exemplary embodiment of this disclosure;

[0020] Figure 3A schematic diagram of a third SAR detection component provided for an exemplary embodiment of this disclosure;

[0021] Figure 4 A schematic diagram of a fourth SAR detection component provided for an exemplary embodiment of this disclosure;

[0022] Figure 5 A flowchart of a first SAR detection method provided as an exemplary embodiment of this disclosure;

[0023] Figure 6 A schematic diagram of a first electronic device provided for an exemplary embodiment of this disclosure;

[0024] Figure 7 A schematic diagram of a second electronic device provided as an exemplary embodiment of this disclosure;

[0025] Figure 8 A schematic diagram of a substrate provided for an exemplary embodiment of this disclosure;

[0026] Figure 9 A schematic diagram of another substrate provided for an exemplary embodiment of this disclosure;

[0027] Figure 10 A schematic diagram of a third electronic device provided as an exemplary embodiment of this disclosure;

[0028] Figure 11 A schematic block diagram of an electronic device provided for an exemplary embodiment of this disclosure. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0030] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0031] This exemplary embodiment first provides a SAR detection component 10, such as Figure 1 As shown, the SAR detection assembly 10 includes: a sensing stub 110, a detection branch 120, a compensation branch 130, and a SAR sensor 140. The sensing stub 110 is used to sense a capacitance signal. The first end of the detection branch 120 is connected to the sensing stub 110, and the detection branch is used to transmit the capacitance signal. The detection branch 120 also senses ambient noise to generate a first noise signal. The SAR sensor 140 is connected to the second end of the detection branch 120. The capacitance signal sensed by the sensing stub 110 and the first noise signal are transmitted to the SAR sensor through the detection branch 120. The first end of the compensation branch 130 is connected to a reference power supply, and the second end of the compensation branch 130 is connected to the SAR sensor 140. The compensation branch 130 senses ambient noise to generate a second noise signal and transmits the second noise signal to the SAR sensor 140. The second noise signal is used to simulate the first noise signal, so as to compensate the signal transmitted from the detection branch 120 to the SAR sensor 140 using the second noise signal.

[0032] Among them, the detection branch 120 and the compensation branch 130 can be connected differentially. In the differential dual channel, the compensation branch 130 and the detection branch 120 are independent (the compensation branch 130 is not connected to the sensing stub 110).

[0033] The signal transmitted from the detection branch 110 to the SAR sensor 140 includes the capacitance signal and a first noise signal, and a second noise signal is used to simulate the first noise signal. The compensation branch 120 is configured to make the second noise signal consistent with the first noise signal. Consistency between the second noise signal and the first noise signal means that the second noise signal and the first noise signal are the same or similar (within an acceptable range of error).

[0034] The SAR detection component 10 provided in this embodiment transmits the capacitance signal sensed by the sensing stub 110 to the SAR sensor 140 via the detection branch 120. A second noise signal is generated by sensing ambient noise via the compensation branch 130, and this second noise signal is transmitted to the SAR sensor 140. The second noise signal simulates the first noise signal generated by the detection branch 120 in response to ambient noise. By compensating the signal transmitted from the detection branch 120 to the SAR sensor 140 with the second noise signal, the first noise signal is separated, thereby improving the detection accuracy of the SAR detection component. Furthermore, it allows the sensing stub to be located at a distance from the SAR sensor, enabling the SAR sensor to connect to sensing stubs at multiple locations.

[0035] The following will describe in detail the various parts of the SAR detection component 10 provided in the exemplary embodiments of this disclosure:

[0036] like Figure 2 As shown, the sensing stub 110 is associated with the corresponding antenna radiator ANT. The capacitance signal is used to determine the distance relationship (closer or farther away) between the antenna radiator ANT and the human body (e.g., the user's hand and head). The association between the sensing stub 110 and the antenna radiator ANT means that the sensing stub 110 and the antenna radiator ANT are shared. In this case, the antenna radiator ANT is suspended, meaning it can be directly used to detect SAR. There is no DC path between the antenna radiator ANT and the feed terminal, and there is no DC path between the antenna radiator ANT and the ground terminal. That is, the antenna radiator ANT and the feed terminal are not connected (coupled), or a DC blocking device (capacitor) is provided between the antenna radiator ANT and the feed terminal, and the antenna radiator ANT and the ground terminal are not connected, or a DC blocking device (capacitor) is provided between the antenna radiator ANT and the ground terminal.

[0037] Alternatively, the association between the sensing stub 110 and the antenna radiator ANT means that the sensing stub 110 includes a sensor located near the corresponding antenna radiator ANT (the distance between the sensing stub 110 and the corresponding antenna radiator ANT is less than a preset sensing distance, causing the sensing stub 110 to form a parasitic stub). In this case, the antenna radiator has a path for transmitting DC current with the ground terminal and / or the feed terminal. The material of the sensing stub 110 can be a conductor such as a metal, or it can be a semiconductor material; this disclosure does not specifically limit this.

[0038] Based on this, the antenna radiator ANT cannot be directly used for SAR detection. The antenna radiator ANT has a DC path with the ground terminal and / or the feed terminal. This can be understood as allowing DC current to be transmitted between the antenna radiator ANT and at least one of the ground terminal and the feed terminal. That is, the antenna radiator ANT is connected to the ground terminal, and no DC blocking device (such as a capacitor) is placed between the antenna radiator ANT and the ground terminal. Alternatively, the antenna radiator ANT is connected to the feed terminal, and no DC blocking device (such as a capacitor) is placed between the antenna radiator ANT and the feed terminal. Alternatively, the antenna radiator ANT is connected to both the feed terminal and the ground terminal, and no DC blocking device (such as a capacitor) is placed between the antenna radiator ANT and both the feed terminal and the ground terminal. Here, the feed terminal refers to the terminal that provides a feed signal to the first antenna radiator 110, and the feed terminal is typically connected to the radio frequency circuit.

[0039] like Figure 3As shown, the sensing stub 110 is the antenna radiator ANT, meaning that the antenna radiator ANT and the sensing stub 110 are shared. The antenna radiator ANT is connected to the SAR sensor 140, and the antenna radiator ANT can be located on the frame of the electronic device. The frame of the electronic device can be a metal frame, which is divided into multiple sensing stubs, and the antenna radiator ANT is one of the multiple stubs of the metal frame.

[0040] The antenna radiator ANT is connected to the radio frequency module 210, which is used to transmit and receive radio frequency signals. The antenna radiator ANT and the radio frequency module 210 can be coupled together via capacitor C1. Of course, in practical applications, the antenna radiator ANT and the radio frequency module 210 can also be connected in other ways, and this embodiment does not specifically limit this.

[0041] When the antenna radiator ANT and the sensing stub 110 are used together, the antenna radiator ANT is suspended. The antenna radiator ANT can also be connected to a tuning circuit unit, which can include one or more tuning circuits. For example, the tuning circuit unit can include a first tuning circuit and a second tuning circuit. The first tuning circuit can include a first tuning switch, with its first terminal connected to the antenna radiator ANT and its second terminal grounded. For example, the first tuning switch can include a first MOSFET, with its first terminal connected to the antenna radiator ANT and its second terminal grounded; the first MOSFET can be in a turned-off state during SAR detection. The second tuning circuit can include a second tuning switch, with its first terminal connected to the antenna radiator ANT and its second terminal grounded. For example, the second tuning switch can include a second MOSFET, with its first terminal connected to the antenna radiator ANT and its second terminal grounded; the second MOSFET can be in a turned-off state during SAR detection.

[0042] Or such as Figure 4 As shown, the sensing stub 110 is a sensor 111. The sensor 111 can be a conductor or semiconductor device placed near the antenna radiator ANT. In this case, the antenna radiator ANT cannot be directly used to detect SAR.

[0043] The sensor 111 can be a parasitic stub coupled to the antenna radiator ANT. This parasitic stub is capable of directly detecting SAR. The parasitic stub can be suspended for DC current.

[0044] Alternatively, the sensor 111 and the antenna radiator may not be coupled. The sensor 111 may be one or more of the following: a flexible circuit board, volume button, power button, fingerprint module, receiver, speaker module, camera module, wireless charging module, motherboard bracket, small board bracket, NFC module, camera decorative ring, and conductor card holder.

[0045] When the sensor 111 is a flexible circuit board, the flexible circuit board can be a flexible circuit board connecting the antenna radiator ANT and the main board of the electronic device. The flexible circuit board is located near the antenna radiator ANT and can act as a branch of the flexible circuit board. The flexible circuit branch can be a parasitic branch of the flexible circuit board, and the flexible circuit board branch can also sense the capacitance generated by the human body. By detecting the sensed capacitance generated by the flexible circuit board branch, the distance between the antenna radiator ANT and the human body can be determined.

[0046] When the sensor 111 is a volume button, the volume button is made of a conductive material, such as aluminum alloy or stainless steel. The volume button can be located on the frame of the electronic device. An insulating coating can be applied to the area where the volume button contacts the frame to allow the volume button to float.

[0047] One approach is to create a through-hole on the side frame of the electronic device, through which the volume buttons enter the device and connect to the volume control circuitry. To isolate the volume buttons from the frame, an insulating material can be coated onto the surface of the volume buttons. Alternatively, in practical applications, the inner wall of the through-hole on the frame can also be coated with insulating material.

[0048] When the sensor 111 is a power button, the power button is made of a conductive material, such as aluminum alloy or stainless steel. The power button can be located on the frame of the electronic device. An insulating coating can be applied to the area where the power button contacts the frame to allow the power button to float.

[0049] One approach is to create a through-hole on the side frame of the electronic device, through which the power button enters the device and connects to the power-on circuit. To isolate the power button from the frame, an insulating material can be coated onto the surface of the power button. Alternatively, in practical applications, the inner wall of the through-hole on the frame can also be coated with insulating material.

[0050] When the sensor 111 is a motherboard bracket, the motherboard bracket can be made of a conductive material, such as aluminum alloy, copper, or stainless steel. The motherboard bracket can be located on the middle frame, and the motherboard is mounted on the motherboard bracket. Since both the middle frame and the motherboard are grounded, the motherboard bracket, the motherboard, and the middle frame need to be insulated. For example, the motherboard bracket has a first contact portion and a second contact portion. The first contact portion contacts the middle frame, and the second contact portion connects to the motherboard. Insulating material can be coated onto the first and second contact portions of the motherboard bracket to form an insulating layer.

[0051] When the inductor 111 is a small board support, the material of the small board support can be a conductive material, such as aluminum alloy, copper, or stainless steel. The small board support can be located on the middle frame, and the small board is mounted on the small board support. Since both the middle frame and the small board are grounded, the small board support, the small board, and the middle frame need to be insulated. For example, the small board support has a first contact portion and a second contact portion. The first contact portion contacts the middle frame, and the second contact portion connects to the small board. Insulating material can be coated on the first and second contact portions of the small board support to form an insulating layer.

[0052] When the sensor 111 is a card tray, the card tray may have a conductive part, which may be made of aluminum alloy, copper, or stainless steel, etc. The card tray may include a conductive part, a connecting part, and a receiving part. The two ends of the connecting part are respectively connected to the conductive part and the receiving part, and the receiving part is used to hold a readable electronic card. When installed in an electronic device, the conductive part is exposed to the frame of the electronic device. A through-hole may be provided on the frame of the electronic device, and the conductive part extends into the through-hole. An insulating layer may be provided on the sidewall of the conductive part, which refers to the part opposite to the through-hole. The connecting part may be made of insulating material. Since a grounding point is provided on the receiving part, the conductive part and the receiving part are isolated by the connecting part. The SAR sensor may be connected to the conductive part.

[0053] In practical applications, electronic devices may include one or more sensing stubs 110 to achieve full-band, all-around detection of the electronic device. For example, the number of sensing stubs 110 in an electronic device may be 1, 2, 3, 4, 5, etc.

[0054] For example, an electronic device may include a first sensing stub, a second sensing stub, and a third sensing stub. The first sensing stub is suspended and used to sense and generate a first capacitance signal; the second sensing stub is suspended and used to sense and generate a second capacitance signal; the third sensing stub is suspended and used to sense and generate a third capacitance signal; a SAR sensor 140 is connected to the first sensing stub, the second sensing stub, and the third sensing stub respectively, and is used to detect the first capacitance signal, the second capacitance signal, and the third capacitance signal.

[0055] The first sensing element can be any one or more of the following: antenna radiator, flexible circuit board, volume button, power button, fingerprint module, receiver, speaker module, camera module, wireless charging module, motherboard bracket, small board bracket, NFC module, camera decorative ring, and conductor tray.

[0056] The second sensing element can be any one or more of the following: antenna radiator, flexible circuit board, volume button, power button, fingerprint module, receiver, speaker module, camera module, wireless charging module, motherboard bracket, small board bracket, NFC module, camera decorative ring, and conductor tray.

[0057] The third sensing segment can be any one or more of the following: antenna radiator, flexible circuit board, volume button, power button, fingerprint module, receiver, speaker module, camera module, wireless charging module, motherboard bracket, small board bracket, NFC module, camera decorative ring, and conductor tray. The first, second, and third sensing segments are all different.

[0058] In this embodiment, the detection branch 120 extends from the sensing stub 110 to the SAR sensor 140. Other modules, such as processors, microprocessors, memory, various sensors, and imaging modules, are often disposed between the sensing stub 110 and the SAR sensor 140. These modules may interfere with the signal in the detection branch 120. The compensation branch 130 is used to detect noise signals on the output path of the signal from the sensing stub 110 to the SAR sensor 140. The main sources of noise on the transmission path include interference from other modules of electronic equipment along the wiring path, as well as environmental thermal noise on the transmission path. The first terminal of the compensation branch 130 is grounded, and the second terminal of the compensation branch 130 is connected to the SAR sensor 140. The compensation branch 130 can sense interference signals from interfering modules on the wiring path and thermal noise signals on the wiring path, and transmit the interference signals and thermal noise signals as noise signals to the SAR sensor 140.

[0059] To accurately detect noise signals on detection branch 120, the routing path of compensation branch 130 can be consistent with that of detection branch 120. This consistency ensures that the interference and thermal noise signals of detection branch 120 are identical to those of compensation branch 130. In other words, the noise signal in detection branch 120 is consistent with the noise signal sensed by compensation branch 130. Based on the noise signal detected by compensation branch 130, the noise signal detected by detection branch 120 can be separated, thereby obtaining the useful signal from the signal detected by detection branch 120.

[0060] The detection branch 120 and the compensation branch 130 generate thermal noise signals in response to the ambient temperature. To ensure that the thermal noise signals generated by the detection branch 120 and the compensation branch 130 in response to ambient temperature are consistent, their capacitance-temperature curves are identical. The capacitance-temperature curve refers to the curve generated by the capacitance of a device in response to temperature changes. That is, at any temperature, the equivalent capacitance of the detection branch 120 is identical to the equivalent capacitance of the compensation branch 130 at that temperature. Furthermore, the equivalent resistance and equivalent inductance, and other circuit parameters of the detection branch 120 and the compensation branch 130 are also identical.

[0061] It should be noted that the consistent placement path of the compensation branch 130 and the detection branch 120 means that the compensation branch 130 is arranged along the detection branch 120, and the two channels are close to each other. In other words, the distance between the placement paths of the compensation branch 130 and the detection branch 120 is less than a preset placement distance. For example, the preset placement distance can be 1 mm, 2 mm, or 3 mm, etc., meaning the distance between the placement path of the compensation branch 130 and the detection branch 120 is less than 1 mm, 2 mm, or 3 mm, etc. Furthermore, the length of the detection branch 120 is consistent with the length of the compensation branch 130 (the difference in length does not exceed the allowable error range), and the routing method of the detection branch 120 is consistent with the routing method of the compensation branch 130 (for example, both routing paths are zigzag, arc, etc.). The placement positions of the devices in the detection branch 120 are consistent with the placement positions of the devices in the compensation branch 130.

[0062] SAR detection focuses on the capacitance signal acquired by the sensing branch 110. The capacitance signal induced in the detection branch 120 affects the detection results; therefore, the compensation branch 130 detects the capacitance changes caused by environmental factors. The routing path of the compensation branch 130 is consistent with that of the detection branch 120. The desired effect is to ensure that the capacitance difference between the second noise signal and the first noise signal generated by the compensation branch 130 in response to environmental factors does not exceed a preset threshold. For example, the capacitance difference between the second noise signal and the first noise signal should not exceed 1mF, 3mF, or 5mF.

[0063] The first end of the detection branch 120 is connected to the sensing stub 110, and the second end of the detection branch 120 is connected to the SAR sensor 140. For example... Figure 2 As shown, the detection branch 120 includes a first inductor circuit 121 and a first filter circuit 122. The first end of the first inductor circuit 121 is connected to the sensing branch 110; the first end of the first filter circuit 122 is connected to the second end of the first inductor circuit 121, and the second end of the first filter circuit 122 is connected to the SAR sensor 140.

[0064] The detection branch 120 also includes multiple connecting lines (such as wires or coaxial cables), which are used to connect the various components of the detection branch 120. The first inductor circuit 121 and the antenna radiator 111 are connected by a connecting line, the first inductor circuit 121 and the first filter circuit 122 are connected by a connecting line, and the first filter circuit 122 and the SAR sensor 140 are connected by a connecting line.

[0065] The first inductor circuit 121 is used to isolate the sensing stub 110 and the SAR sensor 140, preventing high-frequency signals from flowing to the SAR sensor 140. The first inductor circuit 121 may include a first inductor L1, one end of the winding of the first inductor L1 is connected to the sensing stub 110, and the other end of the winding of the first inductor L1 is connected to the SAR sensor 140.

[0066] The first filter circuit 122 is used to filter out interference signals on the detection branch and improve the anti-electrostatic interference capability of the detection branch. The first filter circuit 122 is located close to the SAR sensor 140. For example, the SAR sensor 140 is located on the motherboard, and the first filter circuit 122 is located on the motherboard and adjacent to the SAR sensor 140.

[0067] like Figure 3 As shown, the first filter circuit 122 may include an RC (resistor-capacitor) filter circuit. The first terminal of the RC filter circuit is connected to the second terminal of the first inductor circuit 121, and the second terminal of the RC filter circuit is connected to the SAR sensor 140. The RC filter circuit may include a capacitor and a resistor, which may be connected in series or in parallel. Of course, in practical applications, the RC filter circuit may also include inductors and other components; this embodiment does not specifically limit this.

[0068] The first end of the compensation branch 130 is connected to the reference power supply, and the second end of the compensation branch 130 is connected to the SAR sensor 140. The compensation branch 130 is used to detect the noise signal of the detection branch 120, and the noise signal is used to compensate for the signal transmitted from the detection branch 120 to the SAR sensor 140. The reference power supply can be grounded or other power supply with a constant level.

[0069] The compensation branch 130 includes: a compensation capacitor circuit 131, a second inductor circuit 132, and a second filter circuit 133. The first end of the compensation capacitor circuit 131 is grounded; the first end of the second inductor circuit 132 is connected to the second end of the compensation capacitor circuit 131; the first end of the second filter circuit 133 is connected to the second end of the second inductor circuit 132; and the second end of the second filter circuit 133 is connected to the SAR sensor 140.

[0070] The compensation branch 130 also includes multiple connecting lines (such as wires or coaxial cables), which are used to connect the various components of the compensation branch 130. The compensation capacitor circuit 131 and the reference power supply are connected by a connecting line. The second inductor circuit 132 and the compensation capacitor circuit 131 are connected by a connecting line, the second inductor circuit 132 and the second filter circuit 133 are connected by a connecting line, and the second filter circuit 133 and the SAR sensor 140 are connected by a connecting line.

[0071] The compensation capacitor circuit 131 includes a compensation capacitor C2. One capacitor plate of the compensation capacitor C2 is grounded, and the other capacitor plate is connected to the second inductor circuit 132. The second inductor circuit 132 includes a second inductor L2. One end of the winding of the second inductor L2 is connected to the compensation capacitor, and the other end of the winding of the second inductor L2 is connected to the second filter circuit 133. The second inductor L2 is used to simulate the first inductor L1, and the second inductor L2 can be arranged adjacent to the first inductor L1. For example, the first inductor L1 can be located on the motherboard, and the second inductor L2 can be located on the motherboard, with the second inductor L2 adjacent to the first inductor L1. The signal generated by the second inductor L2 in response to environmental factors is the same as the noise signal generated by the first inductor L1 in response to environmental factors.

[0072] The second filter circuit 132 is used to filter out interference signals on the compensation branch and improve the anti-electrostatic interference capability of the compensation branch. The second filter circuit 132 is located close to the SAR sensor 140. For example, the SAR sensor 140 is located on the motherboard, and the second filter circuit 132 is located on the motherboard and adjacent to the SAR sensor 140.

[0073] The second filter circuit 133 may include an RC (resistor-capacitor) filter circuit. The first terminal of the RC filter circuit is connected to the second terminal of the second inductor circuit 132, and the second terminal of the RC filter circuit is connected to the SAR sensor 140. The RC filter circuit may include a capacitor and a resistor, which may be connected in series or in parallel. In practical applications, the RC filter circuit may also include inductors or other components; this embodiment does not specifically limit this. The second filter circuit 133 is used to simulate the first filter circuit 122, and the second filter circuit 133 may be arranged adjacent to the first filter circuit 122. For example, the first filter circuit 122 may be located on the motherboard, and the second filter circuit 133 may also be located on the motherboard, adjacent to the first filter circuit 122. The signal generated by the second filter circuit 133 in response to environmental factors is the same as the noise signal generated by the first filter circuit 122 in response to environmental factors.

[0074] The second inductor circuit 132 and the compensation capacitor circuit 131 are configured to make the circuit parameters of the compensation branch 130 consistent with the circuit parameters of the detection branch 120. These circuit parameters may include equivalent capacitance, equivalent resistance, and equivalent inductance. In the compensation branch 130, the circuit parameters of the compensation branch 130 and the detection branch 120 can be made consistent by adjusting the inductance value of the second inductor circuit 132 and the capacitance value of the compensation capacitor circuit 131.

[0075] The SAR sensor 140 can be connected to a controller, and it connects to the detection branch 120 and the compensation branch 130. The SAR sensor can also be connected to the first filter circuit 122 and the second filter circuit 133. The SAR sensor has multiple channels; for example, the number of channels can be 2, 3, 4, 5, or 6. The controller and the SAR sensor are connected, and the SAR sensor is used to detect the signals detected by the inductive detection branch 120 and the signals detected by the inductive compensation branch 130.

[0076] SAR sensors can include planar capacitive sensors that determine a person's approach or departure by measuring the capacitance change generated when a corresponding part of the human body (such as the hand or head) approaches or moves away from a corresponding location (sensing stub 110) of the sensing electronic device. The detection results of the SAR sensor are related to the dielectric constant of the human body, the facing area, and the distance. When the sensing capacitance of the sensing stub 110 gradually increases, it is considered that the user is approaching the sensing stub 110; when the sensing capacitance of the sensing stub 110 gradually decreases, it is considered that the user is moving away from the sensing stub 110.

[0077] The controller may include a microprocessor connected to a SAR sensor. The microprocessor receives the detection signal and a noise signal, and compensates for the detection signal based on the noise signal, thereby separating the noise signal from the detection signal. Of course, in practical applications, the controller may also be shared with the processor of an electronic device, and the embodiments disclosed herein are not limited thereto.

[0078] In this embodiment, the detection branch detects a mixed signal of a useful signal (the induced capacitance signal of the sensing stub) and a first noise signal, and transmits the mixed signal to the SAR sensor. The compensation branch detects a second noise signal, and subsequently processes and cancels the common-mode noise coupled to the two paths using an algorithm to obtain the useful signal, thereby improving the recognition sensitivity.

[0079] The SAR detection component 10 provided in this embodiment transmits the capacitance signal sensed by the sensing stub 110 to the SAR sensor 140 via the detection branch 120. A second noise signal is generated by sensing ambient noise via the compensation branch 130, and this second noise signal is also transmitted to the SAR sensor 140. The second noise signal simulates the first noise signal generated by the detection branch 120 in response to ambient noise. The second noise signal compensates for the signal transmitted from the detection branch 120 to the SAR sensor 140, thus separating the first noise signal and improving the detection accuracy of the SAR detection component. Furthermore, it allows the sensing stub to be located at a distance from the SAR sensor, enabling the SAR sensor to connect to multiple sensing stubs. Since the compensation branch 130 is not connected to the sensing stub 110, it avoids the need for additional isolation capacitors or other structures in the circuit, effectively reducing the offset capacitance of the detection branch and preventing excessively large offset capacitance from causing SAR sensor failure.

[0080] This exemplary embodiment also provides a SAR detection method for the SAR detection component 10 described above, such as... Figure 5 As shown, the SAR detection method may include the following steps:

[0081] Step S510: Obtain the signal transmitted from the detection branch to the SAR sensor. The signal transmitted from the detection branch to the SAR sensor includes a capacitance signal and a first noise signal.

[0082] Step S520: Obtain the second noise signal transmitted to the SAR sensor from the compensation branch;

[0083] Step S530: Compensate the signal transmitted from the detection branch to the SAR sensor based on the second noise signal to determine the capacitance signal sensed by the sensing branch.

[0084] The SAR detection component 10 includes: a sensing stub 110, a detection branch 120, a compensation branch 130, and a SAR sensor 140. The sensing stub 110 is used to sense a capacitance signal. The first end of the detection branch 120 is connected to the sensing stub 110. The SAR sensor 140 is connected to the second end of the detection branch 120, and the capacitance signal sensed by the sensing stub 110 is transmitted to the SAR sensor through the detection branch 120. The compensation branch 130 is connected to the SAR sensor 140, and the compensation branch 130 is used to sense and generate a second noise signal and transmit the second noise signal to the SAR sensor. The second noise signal is used to simulate the noise signal of the detection branch, so as to compensate the signal transmitted from the detection branch 120 to the SAR sensor through the second noise signal.

[0085] The SAR detection method provided in this embodiment transmits the capacitance signal sensed by the sensing stub 110 to the SAR sensor 140 via the detection branch 120. A second noise signal is generated by sensing ambient noise via the compensation branch 130, and this second noise signal is transmitted to the SAR sensor 140. The second noise signal simulates the first noise signal generated by the detection branch 120 in response to ambient noise. The second noise signal compensates for the signal transmitted from the detection branch 120 to the SAR sensor 140, thereby separating the first noise signal and improving the detection accuracy of the SAR detection component. Furthermore, it allows the sensing stub to be located at a distance from the SAR sensor, enabling the SAR sensor to connect to multiple sensing stubs. In other words, multiple sensing stubs 110 located in different positions on the electronic device can share a single SAR sensor 140.

[0086] The steps of the SAR detection method provided in this disclosure will be described in detail below:

[0087] In step S510, the signal transmitted from the detection branch to the SAR sensor can be acquired. The signal transmitted from the detection branch to the SAR sensor includes a capacitance signal and a first noise signal.

[0088] The input terminal of the detection branch 120 is connected to the sensing stub 110, and the output terminal of the detection branch 120 is connected to the SAR sensor 140. When a human body approaches, the sensing capacitance of the sensing stub 110 changes, and the detection branch 120 transmits this capacitance change signal to the SAR sensor 140.

[0089] The detection branch 120 extends from the sensing stub 110 to the SAR sensor 140. Other modules, such as processors, microprocessors, memory, various sensors, and imaging modules, are often located between the sensing stub 110 and the SAR sensor 140. These modules may interfere with the signal in the detection branch 120, and environmental factors such as ambient temperature can also cause interference signals in the detection branch. In other words, the mixed signal transmitted from the detection branch 120 to the SAR sensor 140 includes the useful signal (capacitance signal) and a primary noise signal.

[0090] In step S520, the second noise signal transmitted from the compensation branch 130 to the SAR sensor 140 can be obtained.

[0091] The input terminal of compensation branch 130 is grounded, and the output terminal of compensation branch 130 is connected to SAR sensor 140. Compensation branch 130 senses a second noise signal during transmission. Compensation branch 130 is used to detect noise signals on the signal path from sensing stub 110 to the output of SAR sensor 140. The main sources of noise on the transmission path include interference from other modules of electronic equipment on the trace path, as well as ambient thermal noise on the transmission path.

[0092] To accurately simulate the first noise signal on the detection branch 120, the routing path of the compensation branch 130 can be consistent with that of the detection branch 120. This consistency ensures that the interference and thermal noise signals of the detection branch 120 are identical to those of the compensation branch 130. In other words, the noise signal in the detection branch 120 is consistent with the noise signal sensed by the compensation branch 130. Based on the second noise signal detected by the compensation branch 130, the first noise signal detected by the detection branch 120 can be separated, thereby obtaining the useful signal from the signal detected by the detection branch 120.

[0093] The detection branch 120 and the compensation branch 130 generate thermal noise signals in response to the ambient temperature. To ensure that the thermal noise signals generated by the detection branch 120 and the compensation branch 130 in response to ambient temperature are consistent, their capacitance-temperature curves are identical. The capacitance-temperature curve refers to the curve generated by the capacitance of a device in response to temperature changes. That is, at any temperature, the equivalent capacitance of the detection branch 120 is identical to the equivalent capacitance of the compensation branch 130 at that temperature. Furthermore, the equivalent resistance and equivalent inductance, and other circuit parameters of the detection branch 120 and the compensation branch 130 are also identical.

[0094] In step S530, the signal transmitted from the detection branch to the SAR sensor can be compensated based on the second noise signal to determine the capacitance signal sensed by the sensing branch.

[0095] The signal detected by the detection branch 120 includes a useful signal and a first noise signal, while the signal detected by the compensation branch 130 is a second noise signal. Therefore, the first noise signal in the signal detected by the detection branch 120 can be separated based on the second noise signal detected by the compensation branch 130, thereby obtaining the useful signal. Separating the noise signal can improve the detection accuracy of the SAR detection component 10.

[0096] Since the compensation branch 130 and the detection branch 120 are configured in the same way, the second noise signal generated by the compensation branch 130 in response to the external and internal environments is the same as or similar to the first noise signal generated by the detection branch 120 in response to the external and internal environments. By removing the second noise signal from the mixed signal, the first noise signal can be completely or partially removed. Therefore, the detection accuracy of the SAR detection component can be improved to at least a certain extent.

[0097] In this embodiment of the disclosure, compensating for the signal transmitted from the detection branch to the SAR sensor by the second noise signal means correcting the signal transmitted from the detection branch to the SAR sensor by the second noise signal. This compensation can be addition or subtraction, and the specific situation can be based on the relative positive and negative values ​​of the capacitance signal and the noise signal. This embodiment of the disclosure does not make specific limitations on this.

[0098] The SAR detection method provided in this embodiment transmits the capacitance signal and the first noise signal sensed by the sensing branch 110 to the SAR sensor 140 through the detection branch 120. A second noise signal is generated through the compensation branch 130 to simulate the noise signal on the signal transmission path, and the first noise signal is transmitted to the SAR sensor 140. The second noise signal compensates for the signal transmitted from the detection branch 120 to the SAR sensor, thereby improving the detection accuracy of the SAR detection assembly 10. Furthermore, it allows the sensing branch 110 to be located at a distance from the SAR sensor 140, enabling the SAR sensor 140 to connect to multiple sensing branches 110.

[0099] This disclosure also provides an electronic device, which includes the SAR detection component 10 described above.

[0100] The SAR detection component 10 includes: a sensing stub 110, a detection branch 120, a compensation branch 130, and a SAR sensor 140. The sensing stub 110 is used to sense a capacitance signal. The first end of the detection branch 120 is connected to the sensing stub 110. The SAR sensor 140 is connected to the second end of the detection branch 120, and the capacitance signal sensed by the sensing stub 110 is transmitted to the SAR sensor through the detection branch 120. The compensation branch 130 is connected to the SAR sensor 140, and the compensation branch 130 is used to sense and generate a second noise signal and transmit the second noise signal to the SAR sensor 140. The second noise signal is used to simulate the noise signal of the detection branch 120, so as to compensate the signal transmitted from the detection branch 120 to the SAR sensor through the second noise signal.

[0101] The electronic device provided in this embodiment transmits the capacitance signal and the first noise signal sensed by the sensing stub 110 to the SAR sensor 140 via the detection branch 120. It also generates a second noise signal simulating the noise signal on the signal transmission path via the compensation branch 130, and transmits the first noise signal to the SAR sensor 140. By compensating the signal transmitted from the detection branch 120 to the SAR sensor using the second noise signal, the detection accuracy of the SAR detection component 10 can be improved. Furthermore, it allows the sensing stub 110 to be positioned at a distance from the SAR sensor 140, enabling the SAR sensor 140 to connect to multiple sensing stubs 110 at different locations.

[0102] The electronic devices provided in this disclosure can be mobile phones, tablets, desktop computers, smartphones, e-book readers, multimedia players, cameras, or wearable devices, but are not limited to these. Wearable devices include accessories such as watches, bracelets, glasses, necklaces, and head-mounted electronic devices, as well as clothing such as smart electronic clothing and implantable biological devices. This disclosure does not specifically limit these categories.

[0103] The following describes the electronic device provided in the embodiments of this disclosure in detail, taking a mobile phone as an example:

[0104] like Figure 6 As shown, the electronic device provided in this embodiment may further include a display panel (not shown), a frame 20, a first circuit board 30 (main board), a battery 40, a back cover (not shown), and a second circuit board 50 (small board), etc. The display panel, frame 20, and back cover form a receiving space for accommodating other electronic components or functional modules of the electronic device. Simultaneously, the display panel forms the display surface of the electronic device for displaying images, text, and other information. The display panel can be a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display, etc.

[0105] A glass cover can be installed on the display panel. The glass cover can cover the display panel to protect it from scratches or water damage.

[0106] The frame 20 can be a hollow frame structure. The material of the frame 20 can include conductors such as metal. The frame 20 is divided into multiple sensing segments, one or more of which can serve as sensing segments 110.

[0107] The first circuit board 30 is installed inside the aforementioned receiving space. For example, the first circuit board 30 can be installed on the frame 20 and housed together with the frame 20 in the aforementioned receiving space. A grounding point is provided on the first circuit board 30 to ground the first circuit board 30. The SAR sensor 140 is disposed on the first circuit board 30.

[0108] The first circuit board 30 may also integrate one or more functional modules, such as a motor, microphone, receiver, headphone jack, universal serial bus interface (USB interface), proximity sensor, ambient light sensor, gyroscope, storage unit, and processing unit. Meanwhile, the display panel can be electrically connected to the first circuit board 30. The image sensor can also be located on the motherboard.

[0109] The first circuit board 30 also includes a display control circuit. The display control circuit outputs electrical signals to the display panel to control the information displayed on the display panel. The light-emitting control unit and the color-changing control unit can be located on the main board.

[0110] Any one or more of the following components can also be used as sensing elements 110: flexible circuit board, volume buttons, power button, fingerprint module, receiver, speaker module, camera module, wireless charging module, motherboard bracket, small board bracket, NFC module, camera decorative ring, and conductor tray. The fingerprint module, receiver, speaker module, camera module, wireless charging module, NFC module, electroacoustic module, and camera decorative ring can be housed in the aforementioned receiving space. For example, the fingerprint module and camera module can be located on the back of the display panel. The receiver and speaker module can be located on the second circuit board 50, and the wireless charging module can be located on the first circuit board.

[0111] The battery 40 is installed inside the aforementioned receiving space. For example, the battery 40 can be installed on the frame 20 and housed together with the frame 20 in the aforementioned receiving space. The battery 40 can be electrically connected to the first circuit board 30 to power the electronic device. The first circuit board 30 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic components in the electronic device.

[0112] The back cover is used to form the external outline of the electronic device. The back cover can be molded as a single piece. During the molding process, structures such as the rear camera hole and fingerprint recognition module mounting holes can be formed on the back cover.

[0113] In the electronic device provided in this embodiment, the battery 40 may be disposed between the first circuit board 30 and the second circuit board 50. The second circuit board 50 is disposed on the side of the battery 40 near the bottom of the electronic device, and the first circuit board 30 is disposed on the side of the battery near the top of the electronic device.

[0114] When the SAR sensor 140 is located on the first circuit board 30, and the sensing branch 110 is an antenna radiator ANT located at the bottom of the frame, or when the sensing branch 110 is a fingerprint module, a small board bracket, or a flexible circuit board branch located on the second circuit board 50, the detection branch 120 and the compensation branch 130 extend from the first circuit board to the second circuit board 50.

[0115] In order to enable the detection branch 120 and the compensation branch 130 to extend from the first circuit board 30 to the second circuit board 50, such as Figure 7 As shown, the SAR detection component 10 provided in this disclosure may further include a substrate 60, which extends from the second circuit board 50 to the first circuit board 30, and the detection branch 120 and the compensation branch 130 are disposed on the substrate 60.

[0116] The substrate 60 can be a flexible circuit board or an LCP (Liquid Crystal Polymer) film. The portion of the detection branch 120 disposed on the substrate 60 can be a connecting line or a coaxial line, etc., and the portion of the compensation branch 130 disposed on the substrate 60 can be a connecting line or a coaxial line, etc.

[0117] When the sensing branch 110 includes an antenna radiator ANT, the antenna radiator 111 is located at the bottom of the electronic device frame, and the SAR sensor 140 is located on the first circuit board. The detection branch 120 and the compensation branch 130 extend along the substrate 60 from the first circuit board 30 to the second circuit board 50. The detection branch 120 and the compensation branch 130 are arranged in the order of the second circuit board 50, the substrate 60, and the first circuit board. The antenna radiator ANT is adjacent to the second circuit board 50, the detection branch 120 is connected to the antenna radiator ANT, the compensation capacitor in the compensation branch 130 can be located on the second circuit board 50, and the first inductor circuit 121 and the second inductor circuit 132 can be located on the second circuit board 50. The first inductor circuit 121 can prevent high-frequency signals from being transmitted to the SAR sensor 140, and the location of the first inductor circuit 121 on the second circuit board 50 can prevent interference from being introduced at the source.

[0118] When the sensing stub 110 includes a sensor 111 disposed on the second circuit board 50, the SAR sensor 140 is disposed on the first circuit board; the detection branch 120 and the compensation branch 130 extend from the second circuit board 50 to the first circuit board along the substrate 60. The detection branch 120 and the compensation branch 130 are arranged in the order of the second circuit board 50, the substrate 60, and the first circuit board. The detection branch 120 is connected to the sensing stub, and the compensation capacitor in the compensation branch 130 can be disposed on the second circuit board 50 and adjacent to the sensing stub. The first inductor circuit 121 and the second inductor circuit 132 can be disposed on the second circuit board 50. The first inductor circuit 121 can prevent high-frequency signals from being transmitted to the SAR sensor 140. The first inductor circuit 121 being disposed on the second circuit board 50 can prevent interference from being introduced at the source.

[0119] like Figure 8 As shown, the substrate 60 may include a connecting portion 61, a first extension portion 62, and a second extension portion 63. The first extension portion 62 is connected to the connecting portion 61; the second extension portion 63 is connected to the connecting portion 61, and the second extension portion 63 is located on the side of the connecting portion 61 away from the first extension portion 62. The detection branch 120 is located on the side of the connecting portion 61 close to the first extension portion 62, and the compensation branch 130 is located on the side of the connecting portion 61 close to the second extension portion 63.

[0120] The first epitaxial portion 62 protects the detection branch 120, and the second epitaxial portion 63 protects the compensation branch 130. Furthermore, the first epitaxial portion 62 prevents excessive parasitic capacitance in the detection branch 120, and the second epitaxial portion 63 prevents excessive parasitic capacitance in the compensation branch 130. The widths of the first epitaxial portion 62 and the second epitaxial portion 63 are greater than preset width thresholds; for example, the width of the first epitaxial portion 62 can be greater than or equal to 1 mm, and the width of the second epitaxial portion 63 can be greater than or equal to 1 mm.

[0121] The width of the first extension portion 62 and the width of the second extension portion 63 can be the same. The width of the first extension portion 62 is the distance from its edge to the detection branch 120, and the width of the second extension portion 63 is the distance from its edge to the compensation branch 130. The fact that the widths of the first extension portion 62 and the second extension portion 63 are the same ensures that the compensation branch 130 and the detection branch 120 have the same environment, thereby ensuring that the noise signal in the detection signal is consistent with the noise signal detected by the compensation branch 130. This is the differential dual-channel cross-board connection method provided in this embodiment, which has small parasitic capacitance, is less affected by environmental noise, and ensures high recognition sensitivity of the detection branch 120.

[0122] like Figure 9As shown, to prevent interference signals from other components in the electronic device or from the environment from interfering with the detection branch 120 and the compensation branch 130, the electronic device may further include a first shielding layer 70 and a second shielding layer 80; the first shielding layer 70 covers one surface of the substrate 60, and the second shielding layer 80 covers the other surface of the substrate 60. The first shielding layer 70 and the second shielding layer 80 can be metal layers, for example, the first shielding layer 70 and the second shielding layer 80 can be silver films. Of course, in practical applications, the materials of the first shielding layer 70 and the second shielding layer 80 can also be copper, aluminum, or magnesium, etc. By covering the substrate 60 with the first shielding layer 70 and the second shielding layer 80, shielding against external signals is achieved, avoiding the influence of external interference signals on the detection results and improving the detection accuracy of SAR.

[0123] In practical applications, to prevent the composite substrate formed by setting the first shielding layer 70 and the second shielding layer 80 on both sides of the substrate 60 from being too thick, which would be detrimental to the thinning and lightening of electronic devices, and to prevent the increased rigidity of the composite substrate from being detrimental to the routing of the substrate 60 (bending routing, folding routing), the first shielding layer 70 and the second shielding layer 80 can be shared with other components in the electronic device.

[0124] In electronic devices, a display panel forms a front shell 90, and a metal layer is disposed on the back of the display panel, that is, a metal layer is disposed on the side of the front shell 90 closest to the motherboard. This metal layer can be used to form a first shielding layer. A first shielding area can be disposed on the metal layer on the back of the display panel, and the first shielding area is opposite to the substrate 60. Figure 10 As shown, the first shielding area has a first protrusion 91 and a second protrusion 92, and a first receiving portion is formed between the first protrusion 91 and the second protrusion 92, into which the substrate 60 can be embedded.

[0125] The substrate 60 is disposed between the battery 40 and the front shell 90, that is, the battery 40 is disposed on the side of the substrate 60 away from the front shell 90. The battery 40 may be covered with a metal layer, forming a second shielding layer. A second shielding area is provided on the side of the battery facing the substrate 60, opposite to the substrate 60. The second shielding area has a third protrusion 41 and a fourth protrusion 42, forming a bottom receiving portion between the third protrusion 41 and the fourth protrusion 42, into which the substrate 60 can be embedded.

[0126] It should be noted that the electronic device provided in this embodiment may include multiple sensing branches 110. The sensing branches 110 disposed at the bottom of the frame are connected across the board to the SAR sensor 140 on the motherboard via detection branches 120 and compensation branches 130. The sensing branches 110 disposed around the motherboard are connected to the SAR sensor 140 via detection branches 120 and compensation branches 130.

[0127] Furthermore, such as Figure 11As shown, the electronic device provided in this embodiment may further include a control unit 210, which is connected to the SAR sensor 140. The control unit 210 is used to adjust the corresponding antenna back-off power based on the compensated detection signal. The control unit 210 may be connected to the radio frequency module to adjust the transmit power (antenna back-off power) of the radio frequency module.

[0128] The control unit 210 determines the way the user holds the electronic device based on the capacitance signal detected by the compensated SAR sensor 140, and determines the back-off power of the electronic device based on the way the user holds the electronic device. For example, when the user holds the corresponding sensing stub 110 with one hand, the back-off power of the corresponding antenna radiator ANT increases, reducing the SAR value corresponding to the antenna radiator ANT.

[0129] The electronic device provided in this embodiment transmits the capacitance signal sensed by the sensing stub 110 to the SAR sensor 140 via the detection branch 120. A second noise signal is generated by sensing ambient noise via the compensation branch 130, and this second noise signal is also transmitted to the SAR sensor 140. The second noise signal simulates the first noise signal generated by the detection branch 120 in response to ambient noise. The second noise signal compensates for the signal transmitted from the detection branch 120 to the SAR sensor 140, thus separating the first noise signal and improving the detection accuracy of the SAR detection component. Furthermore, it is used to compensate for channels not connected to sensing stubs, avoiding the need for additional isolation capacitors or other structures in the circuit. This effectively reduces the offset capacitance of the detection channel, preventing excessively large capacitance from causing SAR sensor module failure. Consequently, it allows sensing stubs to be placed at locations far from the SAR sensor, enabling the SAR sensor to connect to sensing stubs at multiple locations.

[0130] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A SAR detection assembly comprising: The SAR detection component comprises: a sensing branch for sensing to generate a capacitance signal; a detection branch, a first end of the detection branch being connected with the sensing branch, the detection branch being used for transmitting the capacitance signal, and the detection branch sensing ambient noise to generate a first noise signal; a SAR sensor, a second end of the detection branch being connected with the SAR sensor, the capacitance signal and the first noise signal being transmitted to the SAR sensor through the detection branch; and a compensation branch, a first end of the compensation branch being connected with a reference power supply end, a second end of the compensation branch being connected with the SAR sensor, the compensation branch being used for sensing ambient noise to generate a second noise signal and transmitting the second noise signal to the SAR sensor, the second noise signal being used for simulating the first noise signal to compensate the signal transmitted to the SAR sensor by the detection branch with the second noise signal, a layout path of the compensation branch being consistent with a layout path of the detection branch. The detection branch and the compensation branch are carried on a substrate, the substrate comprising a connecting part, a first epitaxial part and a second epitaxial part, the first epitaxial part and the second epitaxial part being connected with the connecting part, the second epitaxial part being arranged on a side of the connecting part away from the first epitaxial part, the detection branch being arranged on a side of the connecting part close to the first epitaxial part, and the compensation branch being arranged on a side of the connecting part close to the second epitaxial part.

2. The SAR detection assembly of claim 1, wherein, The compensation branch is configured to make the second noise signal consistent with the first noise signal.

3. The SAR detection assembly of claim 2, wherein, A capacitance-temperature curve of the detection branch is consistent with a capacitance-temperature curve of the compensation branch.

4. The SAR detection assembly of claim 1, wherein, The detection branch comprises: a first inductive circuit, a first end of the first inductive circuit being connected with the sensing branch; a first filter circuit, a first end of the first filter circuit being connected with a second end of the first inductive circuit, and a second end of the first filter circuit being connected with the SAR sensor.

5. The SAR detection assembly of claim 4, wherein, The compensation branch comprises: a compensation capacitance circuit, a first end of the compensation capacitance circuit being connected with a ground terminal, the reference power supply end being the ground terminal; a second inductive circuit, a first end of the second inductive circuit being connected with a second end of the compensation capacitance circuit; and a second filter circuit, a first end of the second filter circuit being connected with a second end of the second inductive circuit, and a second end of the second filter circuit being connected with the SAR sensor.

6. The SAR detection assembly of claim 5, wherein, The second inductive circuit and the compensation capacitance circuit are configured to make circuit parameters of the compensation branch consistent with circuit parameters of the detection branch, the circuit parameters comprising one or more of equivalent resistance, equivalent inductance and equivalent capacitance.

7. The SAR detection assembly of claim 1, wherein, The sensing branch is an antenna radiator, the antenna radiator being arranged on a frame of an electronic device, and the antenna radiator being connected with the detection branch.

8. The SAR detection assembly of claim 1, wherein, The sensing branch is a sensing body, the sensing body being connected with the detection branch, and being used for sensing a distance between a user and the sensing body to generate the capacitance signal.

9. The SAR detection assembly of claim 8, wherein, The sensing body is a parasitic branch, the parasitic branch being coupled with a corresponding antenna radiator, and the parasitic branch being used for sensing to generate the capacitance signal.

10. The SAR detection assembly of claim 8, wherein, The inductor is one or more of a flexible circuit board, a volume key, a power-on key, a fingerprint module, a receiver, a speaker module, a camera module, a wireless charging module, a mainboard support, a small board support, an NFC module, a camera decoration ring, an electro-acoustic module, and a conductor card holder.

11. A method of SAR detection, characterized in that, The SAR detection component of any one of claims 1-10, the SAR detection method comprising: acquiring a signal transmitted by the detection branch to the SAR sensor, the signal transmitted by the detection branch to the SAR sensor including a capacitance signal and a first noise signal; acquiring a second noise signal transmitted by the compensation branch to the SAR sensor; the wiring path of the compensation branch is consistent with the wiring path of the detection branch; the detection branch and the compensation branch are carried on a substrate, the substrate including a connecting portion, a first extension portion, and a second extension portion, the first extension portion and the second extension portion being connected to the connecting portion, the second extension portion being disposed on a side of the connecting portion away from the first extension portion, the detection branch being disposed on a side of the connecting portion close to the first extension portion, and the compensation branch being disposed on a side of the connecting portion close to the second extension portion; compensating the signal transmitted by the detection branch to the SAR sensor according to the second noise signal to determine the capacitance signal sensed by the inductor stub.

12. An electronic device, comprising: The electronic device includes the SAR detection component of any one of claims 1-10.

13. The electronic device of claim 12, wherein, The electronic device further includes: a first circuit board, the SAR sensor being disposed on the first circuit board; a second circuit board, the detection branch and the compensation branch extending from the first circuit board to the second circuit board.

14. The electronic device of claim 13, wherein, The electronic device further includes: a substrate, the substrate extending from the first circuit board to the second circuit board.

15. The electronic device of claim 14, wherein, The substrate includes: a connecting portion; a first extension portion, the first extension portion being connected to the connecting portion; a second extension portion, the second extension portion being connected to the connecting portion and disposed on a side of the connecting portion away from the first extension portion.

16. The electronic device of claim 15, wherein, The width of the first extension portion is the same as the width of the second extension portion, the width of the first extension portion being a distance from an edge of the first extension portion to the detection branch, and the width of the second extension portion being a distance from an edge of the second extension portion to the compensation branch.

17. The electronic device of claim 16, wherein, The electronic device further includes: a first shielding layer, the first shielding layer being disposed on a surface of the substrate; a second shielding layer, the second shielding layer being disposed on another surface of the substrate.

18. The electronic device of claim 17, wherein, The electronic device further includes: a front shell, a metal layer being disposed on a side of the front shell close to the mainboard, the metal layer forming the first shielding layer; a battery, the battery being disposed on a side of the substrate away from the front shell, the battery forming the second shielding layer.

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