WO2023279858A1

WO2023279858A1 - Electronic device and sar detection component

Info

Publication number: WO2023279858A1
Application number: PCT/CN2022/093350
Authority: WO
Inventors: 王佳; 罗益州
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-07-05
Filing date: 2022-05-17
Publication date: 2023-01-12
Also published as: CN115588849A

Abstract

The present invention relates to the technical field of electronic devices, and in particular, to an electronic device and an SAR detection component. The electronic device comprises a sensing capacitor plate, an antenna radiator, an isolation member, and an SAR sensor. The antenna radiator is configured to transmit a radio frequency signal. The isolation member is separately connected to the antenna radiator and the sensing capacitor plate, and the isolation member is configured to isolate an alternating current signal between the antenna radiator and the sensing capacitor plate, and form a direct current channel between the antenna radiator and the sensing capacitor plate. The SAR sensor is connected to the antenna radiator or the sensing capacitor plate, the SAR sensor is configured to receive a sensing capacitive signal, and the sensing capacitive signal is a capacitive signal generated for the sensing capacitor plate and the antenna radiator to sense a distance between a user and the electronic device. The present invention can achieve SAR detection.

Description

Electronic equipment and SAR detection components

cross reference

This disclosure claims the priority of the Chinese patent application with application number 202110758910.6 titled "Electronic Equipment" filed on July 05, 2021, the entire content of which is incorporated herein by reference.

technical field

The present disclosure relates to the technical field of electronic equipment, and in particular, to an electronic equipment and a SAR detection component.

Background technique

With the development and progress of technology, the application of 5G mobile terminals is gradually widespread. There are a large number of antennas in 5G mobile terminals, and SAR (Specific Absorption Rate, electromagnetic wave absorption ratio) compliance requirements are strict. In order to prevent the SAR from exceeding the standard, it is necessary to detect the SAR of the electronic equipment. Therefore, there is a need for an electronic device capable of SAR detection.

It should be noted that the information disclosed in the above background section is only for enhancing the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art.

public content

The purpose of the present disclosure is to provide an electronic device and a SAR detection component, thereby solving one or more problems caused by defects in related technologies at least to a certain extent.

According to a first aspect of the present disclosure, there is provided an electronic device, the electronic device comprising:

Inductive capacitor plate;

An antenna radiator, the antenna radiator is used to send and receive radio frequency signals;

an isolator, the isolator is respectively connected to the antenna radiator and the inductive capacitor plate, the isolator is used to isolate the alternating current signal between the antenna radiator and the inductive capacitor plate, and the A direct current channel is formed between the antenna radiator and the inductive capacitor plate;

A SAR sensor, the SAR sensor is connected to the antenna radiator or the inductive capacitor plate, the SAR sensor is used to receive an inductive capacitor signal, and the inductive capacitor signal is induced by the inductive capacitor plate and the antenna radiator The capacitance signal is generated based on the distance between the user and the sensing body.

According to a second aspect of the present disclosure, a SAR detection component is provided, and the SAR detection component includes:

Inductive capacitor plate;

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure. Apparently, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a first electronic device provided by an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a second electronic device provided by an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a third electronic device provided by an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a fourth electronic device provided by an exemplary embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a fifth electronic device provided by an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a sixth electronic device provided by an exemplary embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a seventh electronic device provided by an exemplary embodiment of the present disclosure;

FIG. 8 is a schematic circuit diagram of a first electronic device provided by an exemplary embodiment of the present disclosure;

Fig. 9 is a schematic circuit diagram of a second electronic device provided by an exemplary embodiment of the present disclosure.

detailed description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification only for convenience, for example, according to the description in the accompanying drawings directions for the example described above. It will be appreciated that if the illustrated device is turned over so that it is upside down, then elements described as being "upper" will become elements that are "lower". When a structure is "on" another structure, it may mean that a structure is integrally formed on another structure, or that a structure is "directly" placed on another structure, or that a structure is "indirectly" placed on another structure through another structure. other structures.

Electromagnetic wave absorption ratio (SAR) is defined as: under the action of an external electromagnetic field, the electromagnetic power absorbed or consumed by a unit mass of human tissue, the unit is W/kg. For the protection of human health, it is necessary to detect the status of electronic equipment and users. The human body is a conductor. When the human body is close to the conductor on the electronic device, the capacitance value sensed by the conductor in the electronic device will change. The proximity of the human body is detected by detecting the capacitance change of the conductor of the electronic device.

Wherein, when the human body is close to the electronic equipment, the body part of the human body will form a capacitor with the conductor on the electronic conductor, and the parts of the human body and the conductor are respectively capacitor plates. The capacitance values of the two capacitive plates are given by the following formula:

d is the distance between the two plates, S is the facing area of the two capacitor plates, and k is the electrostatic constant. According to the capacitance formula, when d becomes smaller, the capacitance value C becomes larger; when d becomes larger, the capacitance value C becomes larger, so it can be The distance change between the human body and the electronic device is detected through the conductor part on the electronic device.

In practical applications, in order to save limited space on electronic equipment, antenna radiators are usually used as inductive capacitive plates for SAR detection. However, with the application of 5G communication technology, the resonant frequency of the antenna radiator is getting higher and higher, which leads to the smaller size of the antenna radiator. For example, at present, some 5G antennas need to resonate in the N77, N78, and N79 frequency bands, and the required antenna resonance size is small. The size of the antenna radiator is small, that is, the area of the capacitive plate is small. From the above formula, it can be obtained that the capacitance of the capacitive plate decreases as the area of the capacitive plate decreases. In practical applications, there is often noise in the detection of the sensing capacitor, so when the area of the capacitor plate is too small, the noise will have a greater impact on the detection result, resulting in the failure of SAR detection or the low accuracy of SAR detection.

An exemplary embodiment of the present disclosure provides an electronic device. As shown in FIG. 1 , the electronic device includes an antenna radiator 110, an inductive capacitor plate 120, an isolator 130, and a SAR sensor 140. The antenna radiator 110 is used to send and receive radio frequency signals. The spacer 130 is connected to the antenna radiator 110 and the inductive capacitor plate 120 respectively, and the spacer 130 is used to isolate the AC signal between the antenna radiator 110 and the inductive capacitor plate 120, and between the antenna radiator 110 and the inductive capacitor plate 120 A DC channel is formed between them; the SAR sensor 140 is connected to the antenna radiator 110 or the inductive capacitance plate 120, and the SAR sensor 140 is used to receive the inductive capacitance signal, and the inductive capacitance signal is that the inductive capacitance plate 120 and the antenna radiator 110 sense the distance between the user and the electronic device change to produce a capacitance signal.

The electronic device provided by the embodiments of the present disclosure senses the distance between the user and the electronic device through the sensing capacitive plate 120 and the antenna radiator 110 to generate a sensing capacitive signal, and detects the sensing capacitive signal through the SAR sensor 140 , thereby realizing SAR detection. And by setting the spacer 130 between the antenna radiator 110 and the inductive capacitor plate 120, the alternating current signal between the antenna radiator 110 and the inductive capacitor plate 120 can be isolated, so that the antenna radiator 110 can perform high-frequency resonance, so as to The radio frequency signal can be transmitted, and the inductive capacitance signal can be generated through the inductive capacitance plate 120 and the antenna radiator 110, which increases the area of the effective capacitance plate during SAR detection, and solves the problem that the small size of the high-frequency antenna radiator 110 cannot realize SAR detection.

Further, as shown in FIG. 2 , the electronic device provided by the embodiment of the present disclosure may further include a controller 170, the controller 170 is connected to the SAR sensor 140, and the controller 170 is used to control the transmission power of the antenna radiator 110 according to the inductive capacitance signal . The transmission power of the antenna radiator 110 is adjusted according to the distance between the user and the electronic device, so as to avoid SAR exceeding the standard.

Each part of the electronic device provided by the embodiment of the present disclosure will be described in detail below:

The electronic device provided by the embodiment of the present disclosure may be a mobile phone, a tablet computer, a desktop computer, a smart phone, an e-book reader, a multimedia player, a camera or a wearable device, etc., but is not limited thereto. Wearable devices include accessories, such as watches, bracelets, glasses, necklaces, head-mounted electronic devices, etc., as well as clothing, such as smart electronic clothing, implantable biological devices, etc., which are not discussed in the embodiments of the present disclosure. Specific limits.

Illustratively, the electronic device can be a mobile phone. As shown in FIG. The accommodation space is used to accommodate other electronic components or functional modules of the electronic equipment. Meanwhile, the display panel 20 forms a display surface of the electronic device for displaying information such as images and texts. The display panel 20 may be a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode display (Organic Light-Emitting Diode, OLED) or other type of display.

The frame 30 may be a hollow frame structure. Wherein, the material of the frame 30 may include a conductor such as metal. The main board 40 is installed inside the above-mentioned receiving space. For example, the main board 40 can be installed on the frame 30 and accommodated together with the frame 30 in the above-mentioned receiving space. A grounding point is provided on the main board 40 to realize the grounding of the main board 40 .

The battery 50 is installed inside the above-mentioned storage space. For example, the battery 50 can be installed on the frame 30 and accommodated in the above-mentioned receiving space together with the frame 30 . The battery 50 can be electrically connected to the motherboard 40, so that the battery 50 can provide power for the electronic device. Wherein, the main board 40 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 50 to various electronic components in the electronic device.

The rear cover 60 is used to form the outer contour of the electronic device. The rear cover 60 can be integrally formed. During the molding process of the rear cover 60 , structures such as a rear camera hole and a fingerprint identification module installation hole may be formed on the rear cover 60 .

The antenna radiator 110 may be an FPC antenna, an LDS antenna, a PDS antenna, or a metal antenna or the like. The antenna radiator 110 is used for sending and receiving radio frequency signals, and there is no direct current path between the antenna radiator 110 and the ground terminal and the feed terminal. The electronic device may further include a first capacitor and a second capacitor, the first capacitor is connected between the feeding terminal and the antenna radiator 110 , and the second capacitor is connected between the ground terminal and the antenna radiator 110 . The feed end can be connected to a radio frequency circuit of the electronic device, and the radio frequency circuit provides an excitation signal to the feed end. The radio frequency circuit is connected to the controller 170, and the controller 170 controls the radio frequency circuit according to the inductive capacitance signal.

A gap is provided between the inductive capacitive plate 120 and the antenna radiator 110 , and the spacer 130 is disposed in the gap. One end of the spacer 130 is electrically connected to the antenna radiator 110 , and the other end of the spacer 130 is electrically connected to the inductive capacitor plate 120 .

As shown in FIG. 4 , the antenna radiator 110 may be a first conductor segment 111 on the frame 30 of the electronic device. For example, the frame 30 of the electronic device may be a metal frame 30, and the metal frame 30 is divided into a plurality of metal segments, and the antenna radiator 110 may be a metal segment on it. The inductive capacitive plate 120 may be the second conductor segment 121 on the frame 30 of the electronic device. There is a gap between the second conductor segment 121 and the first conductor segment 111 , and the spacer 130 is disposed in the gap.

Wherein, the second conductor segment 121 may be a metal segment on the metal frame 30 , or the second conductor segment 121 may also be other components on the frame 30 . For example, the second conductor segment 121 may be a power button or a volume button on the frame 30 .

The first conductor segment 111 and the second conductor segment 121 can be arranged linearly, that is, the first conductor segment 111 and the second conductor segment 121 can be arranged on the same side of the frame 30 . For example, the first conductor segment 111 and the second conductor segment 121 are arranged on the upper frame 30, or the first conductor segment 111 and the second conductor segment 121 are arranged on the lower frame 30, or the first conductor segment 111 and the second conductor segment 121 are arranged On the left frame 30 , or the first conductor segment 111 and the second conductor segment 121 are disposed on the right frame 30 . Of course, in actual use, the first conductor segment 111 and the second conductor segment 121 can also be arranged nonlinearly, for example, the first conductor segment 111 and the second conductor segment 121 are respectively arranged on one side of the electronic device. Examples are not limited to this.

It can be understood that the spacer 130 can also be disposed at a position other than the first conductor segment 111 and the second conductor segment 121 . For example, the spacer 130 may be disposed on the main board 40, the first conductor segment 111 and the spacer 130 are electrically connected through a first connecting wire, and the second conductor segment 121 and the spacer 130 are electrically connected through a second connecting wire.

When the inductive capacitive plate 120 is a volume key, the volume key and the antenna radiator 110 are connected through the spacer 130 . The volume key is made of conductive material, for example, the volume key can be made of aluminum alloy, stainless steel or copper. The volume key can be disposed on the frame 30 of the electronic device. An insulating coating may be provided at the portion where the volume key contacts the frame 30 .

Wherein, a through hole may be provided on the side frame 30 of the electronic device, through which the volume key enters the interior of the electronic device and is connected to the volume adjustment circuit, the volume key and the volume adjustment circuit are insulated, and the volume is adjusted by pressing the volume key. In order to isolate the volume key and the frame 30, an insulating material may be coated on the surface of the volume key. Of course, in practical applications, an insulating material may also be coated on the inner wall of the through hole on the frame 30 .

When the inductive capacitive plate 120 is a power-on key, the power-on key is made of conductive material, for example, the power-on key can be made of aluminum alloy, stainless steel and other materials. The power button can be set on the frame 30 of the electronic device. An insulating coating may be provided at the position where the power-on key contacts the frame 30 .

Wherein, a through hole may be provided on the side frame 30 of the electronic device, through which the power-on key enters the interior of the electronic device and is connected to the power-on circuit. Insulating material can be coated on the surface of the power-on key in order to isolate the power-on key from the frame 30 . Of course, in practical applications, an insulating material may also be coated on the inner wall of the through hole on the frame 30 .

As shown in FIG. 5 , in the embodiment of the present disclosure, the antenna radiator 110 may also be disposed inside the electronic device. The frame 30 may be a ring structure, and the frame 30, the back cover and the display panel form an accommodating space, and the antenna radiator 110 and the inductive capacitor plate 120 are disposed in the accommodating space. For example, the antenna radiator 110 and the inductive capacitor plate 120 may be disposed on the main board 40 , and there is a gap between the antenna radiator 110 and the inductive capacitor plate 120 .

When the antenna radiator 110 and the inductive capacitor plate 120 are disposed in the accommodating space of the electronic device, the extending direction of the antenna radiator 110 may be consistent with the extending direction of the inductive capacitor plate 120 . In addition, the extending direction of the antenna radiator 110 is parallel to one side of the frame 30 , and the distance from the antenna radiator 110 to the side is the same as the distance from the inductive capacitor plate 120 to the side.

Of course, in practical applications, the antenna radiator 110 and the inductive capacitor plate 120 may also be disposed on the rear cover or the middle frame. The antenna radiator 110 and the inductive capacitive plate 120 may also be disposed on different parts of the electronic device, for example, the antenna radiator 110 is disposed on the main board 40, and the inductive capacitive plate 120 is disposed on the back cover, etc., which are not specifically limited in the embodiments of the present disclosure.

It can be understood that the antenna radiator 110 in the embodiment of the present disclosure may also be a parasitic antenna in an electronic device. For example, the antenna radiator 110 may be a device such as a flexible circuit board in an electronic device, which is not specifically limited in this embodiment of the present disclosure.

In a feasible implementation manner of the present disclosure, as shown in FIG. 6 , the isolator 130 can be an inductor 131, one end of the inductor 131 is connected to the antenna radiator 110, and the other end of the inductor 131 is connected to the induction capacitor plate 120, and the inductor 131 It is used to isolate the AC signal between the antenna radiator 110 and the inductive capacitor plate 120 , and to form a DC channel between the antenna radiator 110 and the inductive capacitor plate 120 .

The antenna radiator 110 receives the high-frequency excitation signal at the feeding end to generate high-frequency resonance. The inductor 131 is arranged between the antenna radiator 110 and the inductive capacitor plate 120. Since the feed end provides the antenna radiator 110 with a high-frequency AC signal, the inductor 131 is equivalent to a short circuit for a high-frequency AC signal, so The isolation between the antenna radiator 110 and the inductive capacitor plate 120 is realized, and the size of the antenna radiator 110 meets the resonance requirement.

When performing SAR detection, the signal sensed by the inductive capacitor plate 120 and the antenna radiator 110 is a DC signal, and the inductor 131 has no shielding effect on the DC signal, so SAR can be performed through the combination of the antenna radiator 110 and the inductive capacitor plate 120 detection.

The antenna radiator 110 and the inductive capacitor plate 120 are arranged at intervals, and the inductor 131 may be arranged between the antenna radiator 110 and the inductive capacitor plate 120 . When the inductor 131 is arranged in the gap between the antenna radiator 110 and the inductive capacitor plate 120, a connection block can be arranged in the gap, and the connection block is respectively connected to the antenna radiator 110 and the inductive capacitor plate 120, and the outer surface of the connection block and the inductive capacitor plate 120 are connected. The outer surfaces of the antenna radiator 110 and the inductive capacitor plate 120 are flush. The side of the connection block away from the main board 40 is the outer side. The side of the antenna radiator 110 and the inductive capacitor plate 120 away from the main board 40 is the outer side. The two ends of the connecting block may be provided with recessed parts, the antenna radiator 110 is provided with a first stepped part on the outer surface of the end close to the gap, and the inductive capacitor plate 120 is provided with a second stepped part on the outer surface of the end close to the gap. The recessed parts at both ends of the block cooperate with the first stepped part and the second stepped part respectively, so as to realize installation and positioning.

Alternatively, the inductor 131 may be disposed on the main board 40, the inductor 131 is connected to the antenna radiator 110 through a first connection wire, and the inductor 131 is connected to the inductive capacitor plate 120 through a second connection wire.

In another feasible embodiment of the present disclosure, as shown in FIG. 7 , the isolator 130 includes a connecting body 132, and the connecting body 132 is respectively connected to the antenna radiator 110 and the inductive capacitor plate 120, and the parasitic inductance of the connecting body 132 is greater than that of the antenna radiation. The parasitic inductance of the body 110 , the parasitic inductance of the connection body 132 is greater than the parasitic inductance of the sensing capacitor plate 120 .

The material of the connecting body 132 is a conductive material, for example, the material of the connecting body 132 may be aluminum alloy, titanium alloy, copper or stainless steel. The material of the connecting body 132 may be the same as or different from that of the antenna radiator 110 and the inductive capacitor plate 120 .

The parasitic inductance of the connection body 132 is greater than the parasitic inductance of the antenna radiator 110 and greater than the parasitic inductance of the inductive capacitor plate 120 . In practical applications, the parasitic inductance of the connecting body 132 may be a predetermined multiple of the parasitic inductance of the antenna radiator 110 and the inductive capacitor plate 120 . For example, the parasitic inductance of the connecting body 132 may be 10 times or 100 times of the parasitic inductance of the antenna radiator 110 .

Since the parasitic inductance of the connecting body 132 is larger or much larger than that of the antenna radiator 110 and the inductive capacitor plate 120 , the AC signal between the antenna radiator 110 and the inductive capacitor plate 120 can be isolated through the connecting body 132 . Furthermore, it can be ensured that the antenna radiator 110 meets the size requirement of high-frequency resonance. The connecting body 132 is a conductor, so there is a DC channel between the antenna radiator 110 and the inductive capacitor plate 120 , and SAR detection can be realized through the antenna radiator 110 and the inductive capacitor plate 120 .

Wherein, on a section perpendicular to the first direction of the connecting body 132 , the cross-sectional area of the antenna radiator 110 is larger than that of the connecting body 132 , and the cross-sectional area of the inductive capacitor plate 120 is larger than that of the connecting body 132 . The first direction is a direction from the first end of the connecting body 132 to the second end of the connecting body 132 . A first end of the connection body 132 may be connected to the antenna radiator 110 , and a second end of the connection body 132 may be connected to the inductive capacitor plate 120 . Alternatively, the first end of the connection body 132 may be connected to the inductive capacitor plate 120 , and the second end of the connection body 132 may be connected to the antenna radiator 110 . Since the cross-sectional area of the induction body is smaller than the cross-sectional area of the antenna radiator 110 and the cross-sectional area of the inductive capacitor plate 120 , the parasitic inductance increases at the connection body 132 .

The cross-sectional area of the antenna radiator 110 may be a multiple of a preset number of cross-sectional areas of the connecting body 132 , for example, the cross-sectional area of the antenna radiator 110 may be 10 or 20 times the cross-sectional area of the connecting body 132 . The cross-sectional area of the inductive capacitive plate 120 can be a multiple of a preset number of cross-sectional areas of the connecting body 132, for example, the cross-sectional area of the inductive capacitive plate 120 can be 10 times or 20 times the cross-sectional area of the connecting body 132, etc.

The inductive capacitive plate 120, the antenna radiator 110, and the connecting body 132 may be integrally formed, or the inductive capacitive plate 120, the antenna radiator 110, and the connecting body 132 may be formed separately, which is not specifically limited in this embodiment of the present disclosure.

For example, the inductive capacitor plate 120 , the antenna radiator 110 and the connecting body 132 are integrally formed, and the antenna radiator 110 is the first conductor segment 111 on the frame 30 , and the inductive capacitor plate 120 is the second conductor segment 121 on the frame 30 . At this time, the connector 132 is arranged between the first conductor segment 111 and the second conductor segment 121, the connector 132 fills the first conductor segment 111 and extends to the second conductor segment 121, and the thickness of the connector 132 is smaller than that of the first conductor segment 111 and the second conductor segment 121. The thickness of the second conductor segment 121 and the outer surface of the connecting body 132 are flush with the outer surfaces of the first conductor segment 111 and the second conductor segment 121 , thus ensuring the consistency of the appearance of the electronic device. The thickness of the connecting body 132 is smaller than the thickness of the antenna radiator 110 and the inductive capacitor plate 120, so a recess is formed on the frame 30 at a position opposite to the connecting body 132. In order to ensure the strength of the frame 30, an insulating filling can be provided in the recess. layer.

On this basis, the cross-sectional area of the antenna radiator 110 may be the same as the cross-sectional area of the inductive capacitor plate 120 . Moreover, the length of the antenna radiator 110 may also be consistent with the length of the inductive capacitor plate 120 .

It should be noted that in the embodiment of the present disclosure, the isolator 130 isolating the AC signal between the antenna radiator 110 and the inductive capacitor plate 120 refers to achieving isolation within the allowable range of error, not that the AC signal is between the antenna radiator 110 and the induction capacitor plate 120. The alternating current signal is absolutely isolated between the capacitor plates 120 .

In the embodiment of the present disclosure, the antenna radiator 110 is used as another inductive capacitor plate during SAR detection, and senses the inductive capacitance together with the inductive capacitor plate 120. Does not have a DC path.

For example, the electronic device provided by the embodiment of the present disclosure may further include a first capacitor C1 and a second capacitor C2, the first capacitor C1 is connected between the feed terminal and the antenna radiator 110, and the second capacitor C2 is connected between the ground terminal and the antenna radiator 110. Between the antenna radiators 110, the DC signal between the feeding end and the antenna radiator 110 is isolated by the first capacitor C1, and the DC signal between the ground terminal and the antenna radiator 110 is isolated by the second capacitor C2.

The SAR sensor 140 may be connected to the antenna radiator 110 , or the SAR sensor 140 may be connected to the inductive capacitor plate 120 . The SAR sensor 140 may be a capacitive sensor, and the controller 170 may be a microprocessor (MCU), a single-chip microcomputer, or a processor (CPU). It should be noted that the SAR sensor 140 and the controller 170 provided in the embodiment of the present disclosure can be integrated in the same module (for example, the SAR sensor 140 and the controller 170 can be integrated on the same chip), or the sensor and the controller 170 can be It is set independently, which is not specifically limited in the embodiments of the present disclosure.

When the distance between the antenna radiator 110 and the SAR sensor 140 is less than or equal to the preset distance threshold, the antenna radiator 110 and the SAR sensor 140 are connected through the detection branch 150, and when the distance between the antenna radiator 110 and the SAR sensor 140 is greater than the preset distance threshold , the antenna radiator 110 and the SAR sensor 140 are differentially double-connected through the detection branch 150 and the auxiliary branch 160 .

Wherein, the first end of the detection branch 150 is connected to the antenna radiator 110 or the inductive capacitance plate 120, the detection branch 150 is used to transmit the inductive capacitance signal, and the detection branch 150 induces environmental noise to generate a first noise signal; the SAR sensor 140 It is connected to the second end of the detection branch 150, and the sensing capacitance signal and the first noise signal are transmitted to the SAR sensor 140 through the detection branch 150; the first end of the auxiliary branch 160 is connected to the reference power terminal, and the second end of the auxiliary branch 160 The terminal is connected to the SAR sensor 140, the auxiliary branch 160 is used to sense the environmental noise to generate a second noise signal and transmit the second noise signal to the SAR sensor 140, and the second noise signal is used to simulate the first noise signal to utilize the second noise The signal compensates the signal transmitted by the detection branch 150 to the SAR sensor 140 .

The signal transmitted from the detection branch 150 to the SAR sensor 140 includes a capacitance signal and a first noise signal, and the second noise signal is used to simulate the first noise signal. The auxiliary branch 160 is configured to coincide the second noise signal with the first noise signal. The consistency between the second noise signal and the first noise signal means that the second noise signal is the same or similar to the first noise signal (the error is within the allowable range).

In the embodiment of the present disclosure, the detection branch 150 extends from the antenna radiator 110 to the SAR sensor 140, and other modules are often arranged between the antenna radiator 110 and the SAR sensor 140, such as a processor, a microprocessor, a memory, Various sensors, imaging modules, etc., these modules may interfere with the signal in the detection branch 150 . The auxiliary branch 160 is used to detect noise signals on the output path of the signal from the antenna radiator 110 to the SAR sensor 140 . The main sources of noise on the transmission path include interference from other modules of electronic equipment on the wiring path, and environmental thermal noise on the transmission path. A first end of the auxiliary branch 160 is grounded, and a second end of the auxiliary branch 160 is connected to the SAR sensor 140 . The auxiliary branch 160 can sense the interference signal of the interference module on the wiring path and the thermal noise signal on the wiring path, and transmit the interference signal and the thermal noise signal to the SAR sensor 140 as noise signals.

In order to accurately detect the noise signal on the detection branch 150 , the cloth path of the auxiliary branch 160 may be consistent with the cloth path of the detection branch 150 . The cloth path of the auxiliary branch 160 is consistent with the cloth path of the detection branch 150 , so that the interference signal and thermal noise signal of the detection branch 150 are consistent with the interference signal and thermal noise signal of the auxiliary branch 160 . That is, the noise signal of the detection branch 150 is consistent with the noise signal of the signal sensed by the auxiliary branch 160 . The noise signal detected by the detection branch 150 can be separated according to the noise signal detected by the auxiliary branch 160 , so as to obtain useful signals among the signals detected by the detection branch 150 .

The detection branch 150 and the auxiliary branch 160 will generate thermal noise signals in response to the temperature of the surrounding environment. In order to ensure that the thermal noise signals generated by the detection branch 150 and the auxiliary branch 160 in response to the ambient temperature are consistent, the detection branch 150 and the auxiliary branch The capacitance-temperature curve of 160 is consistent. The capacitance-temperature curve refers to the curve generated by the capacitance of the device in response to temperature changes. That is, the equivalent capacitance of the detection branch 150 at any temperature is consistent with the equivalent capacitance of the auxiliary branch 160 at that temperature. In addition, circuit parameters such as equivalent resistance and equivalent inductance of the detection branch 150 and the auxiliary branch 160 are also consistent.

It should be noted that the same cloth path of the auxiliary branch 160 and the cloth path of the detection branch 150 means that the auxiliary branch 160 is arranged along the detection branch 150, and the two channels are close to each other, that is, the auxiliary branch 160 The distance between the cloth path and the cloth path of the detection branch 150 is smaller than the preset cloth distance. For example, the preset step distance may be 1 mm, 2 mm or 3 mm, ie the distance between the cloth path and the cloth path of the detection branch 150 is less than 1 mm, 2 mm or 3 mm. Moreover, the length of the detection branch 150 is consistent with the length of the auxiliary branch 160 (the difference between the two lengths does not exceed the allowable error range), and the routing of the detection branch 150 is consistent with the routing of the auxiliary branch 160 (for example, Both routing paths are zigzag, arc, etc.). The arrangement positions of the devices in the detection branch 150 are consistent with the arrangement positions of the devices in the auxiliary branch 160 .

What SAR detection focuses on is the capacitive signal obtained by the antenna radiator 110. What is induced in the detection branch 150 and has an impact on the detection result is the capacitive signal. Therefore, what the auxiliary branch 160 needs to detect is the signal caused by environmental factors. change in capacitance. The layout path of the auxiliary branch 160 is consistent with the layout path of the detection branch 150, and the effect to be achieved is that the capacitance difference between the second noise signal and the first noise signal generated by the auxiliary branch 160 in response to environmental factors does not exceed a preset value. Set the threshold. For example, the capacitance difference between the second noise signal and the first noise signal does not exceed 1 mF, 3 mF or 5 mF.

A first end of the detection branch 150 is connected to the antenna radiator 110 , and a second end of the detection branch 150 is connected to the SAR sensor 140 . As shown in Figure 8, the detection branch 150 includes a first inductance unit 151 and a first filter unit 152, the first end of the first inductance unit 151 is connected to the antenna radiator 110; the first end of the first filter unit 152 is connected to the first end of the first filter unit 152 The second terminal of the first inductance unit 151 is connected, and the second terminal of the first filter unit 152 is connected with the SAR sensor 140 .

The detection branch 150 also includes multiple connecting wires (such as wires or coaxial cables, etc.), which are respectively used to connect various components of the detection branch 150 . The first inductance unit 151 is connected to the antenna radiator 110 through a connection line, the first inductance unit 151 is connected to the first filter unit 152 through a connection line, and the first filter unit 152 is connected to the SAR sensor 140 through a connection line. The antenna radiator 110 and the radio frequency module 210 are connected through a first capacitor C1.

Wherein, the first inductance unit 151 is used to isolate the antenna radiator 110 and the SAR sensor 140 to prevent high frequency signals from flowing to the SAR sensor 140 . The first inductor unit 151 may include a first inductor L1, one end of the winding of the first inductor L1 is connected to the antenna radiator 110 , and the other end of the winding of the first inductor L1 is connected to the SAR sensor 140 .

The first filter unit 152 is used to filter out the interference signal on the detection branch 150 and improve the anti-static interference capability of the detection branch 150 at the same time. The first filtering unit 152 is disposed close to the SAR sensor 140 . For example, the SAR sensor 140 is disposed on the main board 40 , and the first filtering unit 152 is disposed on the main board 40 and adjacent to the SAR sensor 140 .

As shown in Figure 9, the first filter unit 152 may include an RC (resistance-capacitance) filter circuit, the first end of the RC filter circuit is connected to the second end of the first inductance unit 151, and the second end of the RC filter circuit is connected to the second end of the first inductance unit 151. The SAR sensor 140 is connected. The RC filter circuit may include capacitors and resistors, and the capacitors and resistors may be connected in series or in parallel. Of course, in practical applications, the RC filter circuit may also include devices such as inductors, which are not specifically limited in this embodiment of the present disclosure.

The first end of the auxiliary branch 160 is connected to the reference power terminal, and the second end of the auxiliary branch 160 is connected to the SAR sensor 140. The auxiliary branch 160 is used to detect the noise signal of the detection branch 150, and the noise signal is used for the detection branch. 150 to compensate the signal transmitted to the SAR sensor 140 . Wherein, the reference power supply terminal may be ground or other power supply terminals with a constant level.

The auxiliary branch 160 includes: a compensation capacitor unit 161, a second inductance unit 162 and a second filter unit 163, the first end of the compensation capacitor unit 161 is grounded; the first end of the second inductance unit 162 is connected to the second end of the compensation capacitor unit 161 end; the first end of the second filtering unit 163 is connected to the second end of the second inductance unit 162 , and the second end of the second filtering unit 163 is connected to the SAR sensor 140 .

The auxiliary branch 160 also includes multiple connecting wires (such as wires or coaxial cables, etc.), which are respectively used to connect various components of the auxiliary branch 160 . The compensation capacitor unit 161 is connected to the reference power terminal through a connection line. The second inductance unit 162 is connected to the compensation capacitor unit 161 through a connection line, the second inductance unit 162 is connected to the second filter unit 163 through a connection line, and the second filter unit 163 is connected to the SAR sensor 140 through a connection line.

The compensation capacitor unit 161 includes a compensation capacitor C3 , one capacitor plate of the compensation capacitor C3 is grounded, and the other capacitor plate of the compensation capacitor C3 is connected to the second inductance unit 162 . The second inductor unit 162 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 filtering unit 163 . The second inductance L2 is used to simulate the first inductance L1, and the second inductance L2 may be arranged adjacent to the first inductance L1. For example, the first inductor L1 may be disposed on the main board 40 , the second inductor L2 may be disposed on the main board 40 , and the second inductor L2 is adjacent to the first inductor L1 . The signal generated by the second inductor L2 in response to the environmental factor is the same as the noise signal generated by the first inductor L1 in response to the environmental factor.

The second filter circuit 132 is used to filter out the interference signal on the auxiliary branch 160 and improve the anti-static interference capability of the auxiliary branch 160 at the same time. The second filter circuit 132 is disposed close to the SAR sensor 140 . For example, the SAR sensor 140 is disposed on the main board 40 , and the second filter circuit 132 is disposed on the main board 40 and adjacent to the SAR sensor 140 .

The second filter unit 163 may include an RC (resistor-capacitor) filter circuit, the first end of the RC filter circuit is connected to the second end of the second inductance unit 162 , and the second end of the RC filter circuit is connected to the SAR sensor 140 . The RC filter circuit may include capacitors and resistors, and the capacitors and resistors may be connected in series or in parallel. Of course, in practical applications, the RC filter circuit may also include devices such as inductors, which are not specifically limited in this embodiment of the present disclosure. The second filtering unit 163 is used to simulate the first filtering unit 152 , and the second filtering unit 163 may be arranged adjacent to the first filtering unit 152 . For example, the first filtering unit 152 is disposed on the main board 40 , the second filtering unit 163 is disposed on the main board 40 , and the second filtering unit 163 is adjacent to the first filtering unit 152 . The signal generated by the second filtering unit 163 in response to the environmental factor is the same as the noise signal generated by the first filtering unit 152 in response to the environmental factor.

The second inductance unit 162 and the compensation capacitor unit 161 are configured to make the circuit parameters of the auxiliary branch 160 consistent with the circuit parameters of the detection branch 150 . Wherein, the circuit parameters may include equivalent capacitance, equivalent resistance, equivalent inductance and the like. In the auxiliary branch 160 , by adjusting the inductance of the second inductance unit 162 and the capacitance of the compensation capacitor 161 , the circuit parameters of the auxiliary branch 160 are consistent with the circuit parameters of the detection branch 150 .

The electronic device provided by the embodiments of the present disclosure senses the distance between the user and the electronic device through the sensing capacitive plate 120 and the antenna radiator 110 to generate a sensing capacitive signal, and detects the sensing capacitive signal through the SAR sensor 140 , thereby realizing SAR detection. And by setting the spacer 130 between the antenna radiator 110 and the inductive capacitor plate 120, the alternating current signal between the antenna radiator 110 and the inductive capacitor plate 120 can be isolated, so that the antenna radiator 110 can perform high-frequency resonance to achieve The radio frequency signal can be transmitted, and the inductive capacitance signal can be generated through the inductive capacitance plate 120 and the antenna radiator 110, which increases the area of the effective capacitance plate during SAR detection, and solves the problem that the small size of the high-frequency antenna radiator 110 cannot realize SAR detection. Moreover, the limited cloth space in the electronic equipment is improved, which is conducive to thinning and miniaturization of the electronic equipment.

Further, the capacitance signal induced by the sensing branch is transmitted to the SAR sensor 140 through the detection branch 150, and the second noise signal is generated by inducting environmental noise through the auxiliary branch 160, and the auxiliary branch 160 transmits the second noise signal to the SAR sensor 140, The second noise signal simulation detection branch 150 responds to the first noise signal generated by environmental noise, and compensates the signal transmitted to the SAR sensor 140 by the detection branch 150 through the second noise signal to separate the first noise signal, which can improve SAR detection. Component detection accuracy.

An exemplary embodiment of the present disclosure also provides a SAR detection assembly, the SAR detection assembly includes an antenna radiator 110, an inductive capacitor plate 120, an isolator 130 and a SAR sensor 140, the antenna radiator 110 is used to send and receive radio frequency signals; the isolator 130 Connect the antenna radiator 110 and the inductive capacitor plate 120 respectively, and the spacer 130 is used to isolate the AC signal between the antenna radiator 110 and the inductive capacitor plate 120, and form a DC channel between the antenna radiator 110 and the inductive capacitor plate 120 The SAR sensor 140 is connected to the antenna radiator 110 or the inductive capacitance plate 120, and the SAR sensor 140 is used to receive the inductive capacitance signal, and the inductive capacitance signal generates capacitance for the inductive capacitance plate 120 and the antenna radiator 110 to sense the distance between the user and the electronic device Signal.

It should be noted that each part of the SAR detection component provided by the implementation of the present disclosure has been described in detail in the part of the electronic device embodiment, and will not be repeated in this embodiment of the present disclosure.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered exemplary only, with the true scope and spirit of the disclosure indicated by the appended claims.

Claims

An electronic device comprising:

Inductive capacitor plate;

An antenna radiator, the antenna radiator is used for transmitting radio frequency signals;

an isolator, the isolator is respectively connected to the antenna radiator and the inductive capacitor plate, the isolator is used to isolate the alternating current signal between the antenna radiator and the inductive capacitor plate, and the A direct current path is formed between the antenna radiator and the inductive capacitor plate;

A SAR sensor, the SAR sensor is connected to the antenna radiator or the inductive capacitor plate, the SAR sensor is used to receive an inductive capacitor signal, and the inductive capacitor signal is induced by the inductive capacitor plate and the antenna radiator The distance between the user and the electronic device generates a capacitive signal.
The electronic device according to claim 1, said spacer comprising:

An inductor, one end of the inductor is connected to the antenna radiator, the other end of the inductor is connected to the inductive capacitor plate, and the inductor is used to isolate the antenna radiator from the inductive capacitor plate. AC signal.
The electronic device according to claim 1, said spacer comprising:

A connecting body, the connecting body is respectively connected to the antenna radiator and the inductive capacitor plate, the parasitic inductance of the connecting body is greater than the parasitic inductance of the antenna radiator, and the parasitic inductance of the connecting body is greater than the inductive capacitance board parasitic inductance.
The electronic device according to claim 3, the two ends of the connecting body are respectively connected to the antenna radiator and the inductive capacitor plate, and on a section perpendicular to the first direction, the cross-sectional area of the antenna radiator is larger than The cross-sectional area of the connecting body, the cross-sectional area of the induction capacitive plate is larger than the cross-sectional area of the connecting body, and the first direction is the direction from the first end of the connecting body to the second end of the connecting body.
The electronic device according to claim 1, wherein the inductive capacitive plate and the antenna radiator are arranged at intervals, and the spacer is arranged between the inductive capacitive plate and the antenna radiator.
The electronic device according to claim 5, the antenna radiator is the first conductor segment of the frame of the electronic device, the inductive capacitor plate is the second conductor segment of the frame of the electronic device, the first conductor segment and the There are gaps between the second conductor segments.
The electronic device according to claim 5, wherein the frame of the electronic device encloses a housing part, the antenna radiator is a first conductor segment in the housing part, and the inductive capacitor plate is a A second conductor segment, a gap is provided between the first conductor segment and the second conductor segment.
The electronic device according to claim 5, wherein the gap is filled with an insulating material, and the insulating material at least partially covers the spacer.
The electronic device according to any one of claims 1-8, wherein there is no direct current path between the antenna radiator and the ground terminal and the feed terminal.
The electronic device according to any one of claims 1-8, when the distance between the antenna radiator and the SAR sensor is less than or equal to a preset distance threshold, the antenna radiator and the SAR sensor are connected through a detection branch , when the distance between the antenna radiator and the SAR sensor is greater than a preset distance threshold, the antenna radiator and the SAR sensor are differentially double-connected through a detection branch and an auxiliary branch.
The electronic device according to claim 10, the detection branch is used to transmit the sensing capacitance signal, and the detection branch induces environmental noise to generate a first noise signal, and the auxiliary branch is used to induce environmental noise to generate and transmitting the second noise signal to the SAR sensor, the second noise signal is used to simulate the first noise signal, so as to use the second noise signal to transmit to the detection branch The signal to the SAR sensor is compensated.
The electronic device of claim 11, the auxiliary branch configured to cause the second noise signal to coincide with the first noise signal.
The electronic device according to claim 12, wherein the cloth path of the auxiliary branch is consistent with the cloth path of the detection branch.
The electronic device according to claim 12, wherein the capacitance-temperature curve of the detection branch is consistent with the capacitance-temperature curve of the auxiliary branch.
The electronic device according to claim 11, said detection branch comprising:

a first inductance circuit, the first end of the first inductance circuit is connected to the induction branch;

A first filter circuit, the first end of the first filter circuit is connected to the second end of the first inductance circuit, and the second end of the first filter circuit is connected to the SAR sensor.
The electronic device according to claim 11, said auxiliary branch comprising:

A compensation capacitor circuit, the first end of the compensation capacitor circuit is grounded, and the reference power supply terminal is a ground terminal;

a second inductance circuit, the first end of the second inductance circuit is connected to the second end of the compensation capacitor circuit; and

A second filter circuit, the first end of the second filter circuit is connected to the second end of the second inductance circuit, and the second end of the second filter circuit is connected to the SAR sensor.
The electronic device according to claim 1, further comprising:

A controller, the controller is connected to the SAR sensor, and the controller is used to control the transmitting power of the antenna radiator according to the inductive capacitance signal.
A SAR detection component, the SAR detection component includes:

Inductive capacitor plate;

An antenna radiator, the antenna radiator is used for transmitting radio frequency signals;

an isolator, the isolator is respectively connected to the antenna radiator and the inductive capacitor plate, the isolator is used to isolate the alternating current signal between the antenna radiator and the inductive capacitor plate, and the A direct current path is formed between the antenna radiator and the inductive capacitor plate;

A SAR sensor, the SAR sensor is connected to the antenna radiator or the inductive capacitor plate, the SAR sensor is used to receive an inductive capacitor signal, and the inductive capacitor signal is induced by the inductive capacitor plate and the antenna radiator The distance between the user and the electronic device generates a capacitive signal.
The SAR detection assembly according to claim 18, said spacer comprising:

An inductor, one end of the inductor is connected to the antenna radiator, the other end of the inductor is connected to the inductive capacitor plate, and the inductor is used to isolate the antenna radiator from the inductive capacitor plate. AC signal.
The SAR detection assembly according to claim 18, said spacer comprising:

A connecting body, the connecting body is respectively connected to the antenna radiator and the inductive capacitor plate, the parasitic inductance of the connecting body is greater than the parasitic inductance of the antenna radiator, and the parasitic inductance of the connecting body is greater than the inductive capacitance board parasitic inductance.