WO2013113246A1 - 接近检测装置及移动终端 - Google Patents

接近检测装置及移动终端 Download PDF

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Publication number
WO2013113246A1
WO2013113246A1 PCT/CN2012/087958 CN2012087958W WO2013113246A1 WO 2013113246 A1 WO2013113246 A1 WO 2013113246A1 CN 2012087958 W CN2012087958 W CN 2012087958W WO 2013113246 A1 WO2013113246 A1 WO 2013113246A1
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WO
WIPO (PCT)
Prior art keywords
capacitance
mobile terminal
antenna body
approaching
value
Prior art date
Application number
PCT/CN2012/087958
Other languages
English (en)
French (fr)
Inventor
王爱猛
范保民
邹炎炎
唐巍
Original Assignee
华为终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to JP2013555744A priority Critical patent/JP2014515093A/ja
Priority to EP20120854553 priority patent/EP2653894A4/en
Priority to US13/950,434 priority patent/US20130310106A1/en
Publication of WO2013113246A1 publication Critical patent/WO2013113246A1/zh

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
    • G06F1/3231—Monitoring the presence, absence or movement of users
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3833—Hand-held transceivers
    • H04B1/3838—Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Definitions

  • the embodiments of the present invention relate to the field of communications, and in particular, to a proximity detecting device and a mobile terminal.
  • wireless products such as mobile terminals (such as smart phones, tablets, portable personal computers) are gradually becoming essential life and office supplies.
  • SAR Specific Absorption Rate
  • some wireless products currently include a proximity sensor that detects the approach and exit of the person. When the proximity of the person is detected, the transmission power is reduced to reduce the radiation of the product to the person.
  • the existing proximity sensor technology scheme uses an FPC (Flexible Printed Circuit) placed near the antenna to detect the change of capacitance.
  • FPC Flexible Printed Circuit
  • the area of the FPC is generally required to be about 28 mm * 25 mm. Adding such a large capacitance detection FPC near the antenna greatly wastes the internal space resources of the originally stressed mobile terminal, which is disadvantageous for miniaturization and thinning of the mobile terminal.
  • an embodiment of the present invention provides a proximity detecting device and a mobile terminal.
  • the embodiment of the present invention provides a proximity detecting device, including: a mobile terminal antenna body and a metal strip on a side of the mobile terminal, forming two poles of the capacitor, for detecting the antenna body of the mobile terminal and the metal strip on the side of the mobile terminal
  • a capacitance detecting sensor circuit electrically coupled to the mobile terminal antenna body and the mobile terminal side metal strip, respectively, according to the capacitance of the mobile terminal antenna body and the mobile terminal side metal strip detection Whether someone is approaching, when it is judged that someone is approaching, an indication signal is output.
  • an embodiment of the present invention provides a mobile terminal, including a proximity detecting device, where the proximity detecting device includes: a mobile terminal antenna body and a side metal strip of the mobile terminal, which constitute two poles of the capacitor, and are used for detecting the movement. a capacitance of a space between the terminal antenna body and the side metal strip of the mobile terminal; a capacitance detecting sensor circuit electrically coupled to the mobile terminal antenna body and the mobile terminal side metal strip, respectively, according to the mobile terminal antenna body and The capacitance detected by the metal strip on the side of the mobile terminal determines whether someone is approaching, and when it is determined that someone is approaching, an indication signal is output.
  • the capacitance of the space sandwiched by the mobile terminal antenna body and the side metal strip of the mobile terminal is detected, and the capacitance detecting sensor circuit determines whether a person is approaching according to the capacitance, and realizes proximity detection, because the mobile terminal itself is used.
  • the antenna body and the side metal strips can save the internal space of the mobile terminal, reduce the design difficulty of the mobile terminal, reduce the cost, and facilitate the miniaturization and thinning of the mobile terminal.
  • FIG. 1 is a schematic structural view of a back side of a mobile terminal
  • FIG. 2 is a schematic structural diagram of a proximity detecting device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural view of another proximity detecting device according to an embodiment of the present invention
  • FIG. 4 is a schematic structural view of another proximity detecting device according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a pin of an AD7156 chip
  • FIG. 6 is a schematic circuit diagram of an AD7156 chip
  • FIG. 7 is a schematic structural diagram of another proximity detecting device according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of another proximity detecting device according to an embodiment of the present invention
  • FIG. 9 is still another proximity detecting device according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.
  • the so-called "mobile terminal” refers to various terminal communication devices whose size is suitable for mobile, including but not limited to: mobile phones, tablet computers, portable personal computers, etc. .
  • the electrical signal passing through ⁇ is physically determined to be related to the electrical signal passing through B.
  • This includes direct connection between ⁇ and B through wires, or through another A component C is indirectly connected, and includes a relationship between ⁇ and B, such as a transformer, through electromagnetic induction through respective electrical signals.
  • FIG. 1 it is a schematic diagram of a back structure of a mobile terminal.
  • the mobile terminal 100 has a rectangular parallelepiped structure and has six external planes.
  • FIG. 1 shows the rear side 110 of the mobile terminal, and the left side surface 130 of the mobile terminal.
  • the lower side 140 of the mobile terminal, the antenna area 120 is a projection area of the antenna body of the mobile terminal 100 on the back surface 110 of the mobile terminal. Since the SAR values of the various planes of the mobile terminal are strictly regulated, it is required to be in various planes of the mobile terminal, especially antennas.
  • the area of the capacitor FPC FPC should be set at about 28mm*25mm, and the FPC area of the antenna emission plane should be larger than the area of the antenna to cover the antenna emission plane.
  • the inventors have found that the capacitance formed by the antenna body and the side metal strip of the mobile terminal can satisfy the requirement of detecting the capacitance range of the front end of the capacitance detecting chip, and the dielectric around the front end detecting capacitor when the person approaches
  • the amount of capacitance change caused by the constant variation can meet the design requirements.
  • the amount of change in the capacitance of the antenna body and the side metal strip can be utilized to detect the distance that the person approaches.
  • FIG. 2 is a schematic structural diagram of a proximity detecting device according to an embodiment of the present invention.
  • the device includes a mobile terminal antenna body and a mobile terminal side metal strip 10, which constitute two poles of a capacitor, and is used for detecting the mobile terminal antenna body and moving The capacitance of the space sandwiched by the metal strips on the side of the terminal;
  • the proximity detecting device further includes a capacitance detecting sensor circuit 11 electrically coupled to the mobile terminal antenna body and the mobile terminal side metal strip 10, according to the mobile terminal antenna body and the mobile terminal side
  • the capacitance detected by the metal strip determines whether someone is approaching, and when it is judged that someone is approaching, an indication signal is output, which is used to indicate that someone is approaching.
  • the capacitance detecting sensor circuit 11 determines whether a person is approaching according to the change in the capacitance.
  • the output person approaches the indication signal, such as a high level or a low level.
  • the capacitance of the space clamped by the mobile terminal antenna body and the side metal strip of the mobile terminal is detected, and the capacitance detecting sensor circuit determines whether a person is approached according to the capacitance, thereby implementing a proximity detection scheme, thereby saving the mobile terminal.
  • Internal space, reduced shift The difficulty in designing the mobile terminal reduces the cost and facilitates miniaturization and thinning of the mobile terminal.
  • the proximity detecting device includes a mobile terminal antenna body and a mobile terminal side metal strip 10 and a capacitance detecting sensor circuit 11, wherein the capacitance detecting sensor circuit 11
  • the capacitor digitizer 211, the register 212, and the comparator 213 are included, and specifically:
  • the mobile terminal antenna body and the mobile terminal side metal strip 10 are configured to detect a capacitance of a space between the mobile terminal antenna body and the mobile terminal side metal strip 10.
  • the mobile terminal antenna body and the mobile terminal antenna body and the mobile terminal side metal strips in the mobile terminal side metal strip 10 respectively correspond to the capacitor poles of one capacitor, and the mobile terminal antenna body and the mobile terminal side can be detected in real time.
  • the capacitance-to-digital converter 211 is configured to acquire capacitances detected by the mobile terminal antenna body and the mobile terminal side metal strips 10, and convert the capacitance into a first capacitance value. Since the capacitance detected by the mobile terminal antenna body and the mobile terminal side metal strip 10 is an analog signal, the capacitance needs to be converted into a digital signal, that is, a first capacitance value, for subsequent processing.
  • a second capacitance threshold value is stored in the register 212, and the second capacitance threshold value is a capacitance value corresponding to a person approaching.
  • the second capacitance threshold may be determined according to actual needs of the product design, for example, when the product is designed to determine that when the distance between the person and the device is less than 13 mm, the person is considered to be close to the device, then the person may be When the device is separated by 13 mm, the capacitance value corresponding to the capacitance detected by the mobile terminal antenna body and the metal strip on the side of the mobile terminal is set as the second capacitance threshold, and the second capacitance threshold is used as a judgment The capacitance value of the device is a critical point.
  • the comparator 213 is configured to determine, according to the first capacitance value and the second capacitance threshold, whether a person is approaching, and output an indication signal when it is determined that a person is approaching, the indication signal is used to indicate that someone is approaching.
  • the first capacitance value may become large when the person approaches, or may become smaller.
  • the comparator 213 can employ different comparison modes.
  • the indication signal is used to indicate that someone is approaching; or, if the first capacitance value becomes smaller when the person approaches, comparing whether the first capacitance value is smaller than the second capacitance gate a limit value, when the first capacitance value is smaller than the second capacitance threshold, outputting an indication signal, the indication signal is used to indicate that a person is approaching.
  • the indication signal may be a high level or may be a low level.
  • the comparator 213 outputs a low level when no one is approaching, and outputs a high level when a person approaches to indicate that someone is approaching; or the comparator outputs a high level when no one is approaching, when someone approaches Then output a low level to indicate that someone is approaching.
  • the capacitance of the space clamped by the mobile terminal antenna body and the side metal strip of the mobile terminal is detected, and the capacitance detecting sensor circuit determines whether a person is approached according to the capacitance, thereby implementing a proximity detection scheme, thereby saving the mobile terminal.
  • the internal space reduces the difficulty of designing the mobile terminal, reduces the cost, and is advantageous for miniaturization and thinning of the mobile terminal.
  • FIG. 4 is a schematic structural diagram of another proximity detecting apparatus according to an embodiment of the present invention.
  • the proximity detecting apparatus includes a mobile terminal antenna body and a mobile terminal side metal strip 10 and a capacitance detecting sensor circuit 11
  • the capacitance detecting sensor circuit 11 includes a capacitance digitizer 311, a register 312, a calculator 313, and a comparator 314. Specifically:
  • the mobile terminal antenna body and the mobile terminal side metal strip 10 are configured to detect the capacitance of the space between the mobile terminal antenna body and the mobile terminal side metal strip 10.
  • the mobile end The mobile terminal antenna body and the mobile terminal side metal strips in the side antenna body and the mobile terminal side metal strip 10 respectively correspond to the capacitance poles of one capacitor, and the mobile terminal antenna body and the mobile terminal side metal strip 10 can be detected in real time.
  • the capacitance of the space clamped.
  • the surrounding environment of the mobile terminal antenna body and the mobile terminal side metal strip 10 changes, for example, when someone approaches or other objects approach, the mobile terminal antenna body and the mobile terminal side metal strip 10 are interposed.
  • the change in the electrical constant further causes a change in the capacitance detected by the mobile terminal antenna body and the mobile terminal side metal strip 10.
  • the capacitance-to-digital converter 311 is configured to acquire the capacitance detected by the mobile terminal antenna body and the mobile terminal side metal strip 10, and convert the capacitance into a first capacitance value. Since the capacitance detected by the mobile terminal antenna body and the mobile terminal side metal strip 10 is an analog signal, the capacitance needs to be converted into a digital signal, that is, a first capacitance value, for subsequent processing.
  • the register 312 stores a third capacitance value and a fourth capacitance difference, the third capacitance value is a capacitance value when no one is approaching, and the fourth capacitance difference is a capacitance value when a person approaches and the The difference between the third capacitance values.
  • the fourth capacitance difference may be determined according to actual needs of the product design, for example, when the product is designed to determine that when the distance between the person and the device is less than 13 mm, then the person is considered to be close to the device, and the person may be When the device is separated by 13 mm, the difference between the capacitance value corresponding to the capacitance detected by the terminal antenna body and the three capacitance value is used as a critical point for judging whether the person is close to the capacitance value of the device.
  • the calculator 313 is configured to calculate a fifth capacitance difference between the first capacitance value and the third capacitance value.
  • the comparator 314 is configured to compare whether the fifth capacitance difference is greater than the fourth capacitance difference, and when the fifth capacitance difference is greater than the fourth capacitance difference, output an indication signal, where The indication signal is used to indicate that someone is approaching.
  • the indication signal may be a high level or may be a low level.
  • the comparator 314 outputs a low level if no one is approaching, and outputs a high level to indicate that someone is approaching when someone approaches; or the comparator 314 outputs a high level when no one is approaching, when someone approaches A low level is output to indicate that someone is approaching.
  • the capacitance of the space clamped by the mobile terminal antenna body and the side metal strip of the mobile terminal is detected, and the capacitance detecting sensor circuit determines whether a person is approached according to the capacitance, thereby implementing a proximity detection scheme, thereby saving the mobile terminal.
  • the internal space reduces the difficulty of designing the mobile terminal, reduces the cost, and is advantageous for miniaturization and thinning of the mobile terminal.
  • the capacitance detecting sensor circuit may be a capacitance converter, and the capacitance converter is a capacitance proximity detecting sensor chip, and may determine whether a person is approaching according to the output capacitance signal, and output an indication signal that is approached by a person.
  • the AD7156 is a dual-channel capacitor converter (Capacitance Converter) manufactured by Analog Devices (ADI). As shown in the figure, the AD7156 has 10 pins. Specifically, the names and functions of the pins are as follows: :
  • the CIN1 of the AD7156 is electrically coupled to the antenna of the mobile terminal antenna.
  • the EXC1 is electrically coupled to the metal strip on the side of the mobile terminal.
  • the AD7156 determines whether someone is approaching based on the input capacitance. When it is determined that someone is approaching, a high level signal is output from OUT1. It is also possible to connect CIN2 and EXC2 of the AD7156 to the two poles of another FPC capacitor to form another path.
  • FIG. 6 it is a circuit structure diagram of the AD7156 in the embodiment of the present invention.
  • the circuit includes two paths: a first capacitor path where the first detecting capacitor 501 is located, and two capacitor poles of the first detecting capacitor 501 respectively CIN1 and EXC1 of the AD7156 are connected to form a first capacitor path; the second capacitor path of the second detecting capacitor 502 is connected to CIN2 and EXC2 of the AD7156 to form a second capacitor path.
  • the two paths are selected by the two-way switch 503.
  • the AD7156 acquires the capacitance detected by the first detecting capacitor 501, and when the two-way switch 503 is connected to the second During the capacitive path, the AD7156 acquires the capacitance detected by the second detecting capacitor 502.
  • the processing procedure of the capacitance signal detected by the first detecting capacitor 501 by the AD7156 is taken as an example to describe the logical structure of the AD7156 and the functions of each module. As shown in FIG. 6, when the two-way switch 503 selects the first capacitive path, the capacitance signal detected by the first detecting capacitor 501 is input to the AD7156 through CIN1 and EXC1; the capacitive signal is an analog signal, which is passed through the capacitance-to-digital converter 505.
  • the capacitance signal is converted into a digital signal, that is, a first capacitance value; since the capacitance detected by the first detection capacitor 501 may be changed in a small range or has noise or the like due to environmental influence, the first capacitance value is not Stabilization will fluctuate in a small range, so it needs to be filtered by the digital filter 506, such as averaging, etc., to obtain a relatively stable first capacitance value; the first capacitance value is input to the first comparator 509; At the same time, the second capacitor threshold value stored in the first threshold register 510 is also input to the first comparator 509, and the second capacitor threshold value is the capacitance corresponding to the capacitance detected by the first detecting capacitor 501 when the person approaches The first comparator 509 compares whether the first capacitance value is greater than the second capacitance threshold, when the first capacitance value is greater than the second capacitance threshold When the output is high, Instruct someone to approach. The high level is output through OUT1.
  • the first capacitance value may also become smaller when a person approaches, and the first comparator 509 compares whether the first capacitance value is smaller than The second capacitor threshold value, when the first capacitor value is less than the second capacitor threshold, the first comparator outputs a high level to indicate that a person is approaching.
  • the high level is output through OUT1.
  • the AD7156 further includes a second threshold register 507 and a second comparator 508.
  • the second threshold register 507 stores a third capacitance threshold.
  • the third capacitance threshold is the second detection capacitor 502 when the person approaches.
  • the second comparator 508 is the same as the first comparator 509.
  • the second comparator 508 compares the capacitance detected by the second detecting capacitor 502. Whether the corresponding capacitance value is greater than the third capacitance threshold.
  • the second comparator 508 outputs High level to indicate that someone is approaching. The high level is output through OUT2.
  • FIG. 7 is a schematic structural diagram of another proximity detecting apparatus according to an embodiment of the present invention.
  • the proximity detecting apparatus includes a mobile terminal antenna body 6011, a mobile terminal side metal strip 6012 and an AD7156 chip 602, and the mobile terminal
  • the antenna body 6011 is connected to the fourth pin of the AD7156 chip 602, that is, CIN1
  • the mobile terminal side metal strip 6012 is connected to the sixth pin of the AD7156 chip 602, that is, EXC1, and the mobile terminal antenna body 6011 and
  • the mobile terminal side metal strips 6012 form two poles of the capacitor, and the mobile terminal antenna body 6011 and the mobile terminal side metal strips 6012 are configured to form a capacitance of a space sandwiched by the capacitor, and the detected capacitance signal is input to the AD7156 chip.
  • the method for determining whether a person is approaching by the AD7156 chip may refer to the description of the embodiment of FIG. 5, and output an indication signal that is approached by a person.
  • the metal strip of the mobile terminal antenna body and the mobile terminal side is detected.
  • the capacitance of the clamped space is measured, and the capacitance detecting sensor circuit determines whether a person is approaching according to the capacitance, thereby implementing a proximity detection scheme, thereby saving the internal space of the mobile terminal, reducing the design difficulty of the mobile terminal, reducing the cost, and facilitating the movement. Miniaturization and thinning of the terminal.
  • a high frequency connection may be connected between the mobile terminal antenna body 6011 and the AD7156 chip 602.
  • the inductance 603, the inductance value of the high frequency inductor 603 may be 82 nanohenry, or 68 nanohenry.
  • a high frequency inductor may be connected in series between the terminal antenna body and the capacitance detecting sensor circuit.
  • FIG. 9 is a schematic structural diagram of another proximity detecting apparatus according to an embodiment of the present invention.
  • the proximity detecting apparatus includes a mobile terminal antenna body 7011, a mobile terminal side metal strip 7012, and a capacitance detecting sensor circuit 702.
  • the mobile terminal antenna body 7011 and the mobile terminal side metal strip 7012 are respectively connected to the capacitance detecting sensor circuit 702, and the mobile terminal antenna body 7011 and the mobile terminal side metal strip 7012 form two poles of the capacitor for detecting
  • the mobile terminal antenna body 7011 and the mobile terminal side metal strip 7012 constitute a capacitance of a space sandwiched by the capacitor, and the detected capacitance signal is input to the capacitance detecting sensor circuit 702, and the capacitance detecting sensor circuit 702 according to the The capacitance signal determines whether someone is approaching and outputs an indication signal that is approached by someone.
  • the capacitance detecting sensor circuit 702 determines whether a person is approaching according to the capacitance signal, and can refer to the description of the foregoing embodiment. Further, in order to reduce the influence of the metal strip or the routing around the mobile terminal antenna body 7011 on the performance of the antenna, a high frequency inductor may be connected in series between the mobile terminal antenna body 7011 and the capacitance detecting sensor circuit 702. 703. The inductance of the high frequency inductor 703 may be 82 nanohenry, or 68 nanohenry.
  • the proximity detecting device can be used in various mobile terminals, including but not limited to smart phones, tablet computers, portable personal computers, and the like.
  • the mobile terminal adjusts the transmission power of the wireless signal to satisfy the SAR value.
  • the regulations reduce the radiation to people.
  • FIG. 10 it is a schematic structural diagram of a mobile terminal, where the mobile terminal includes a mobile terminal antenna body and a mobile terminal side metal strip 801, an inductance detecting sensor circuit 802, a baseband processor 803, and a radio frequency transceiver 804.
  • the mobile terminal antenna body and the mobile terminal side metal strip 801 detect the capacitance of the space where the mobile terminal antenna body and the mobile terminal side metal strip 801 are located; the capacitance detecting sensor circuit 802 acquires the mobile terminal antenna body and the mobile a capacitance detected by the terminal side metal bar 801, determining whether a person is approaching according to the capacitance, and outputting an indication signal, the indication signal is used to indicate whether someone is approaching; the baseband processor 803 acquires the indication signal, and outputs The baseband processor 803 adjusts the maximum transmit power of the radio frequency transceiver 804 according to the indication signal when the indication signal indicates that someone is approaching.
  • the method for determining whether a person is close to the capacitor detection sensor circuit 802 according to the capacitance detected by the antenna body of the mobile terminal and the metal strip 801 of the mobile terminal side may refer to the description of the foregoing embodiment.
  • the capacitance of the space in which the space is clamped is detected by the antenna body of the mobile terminal, and the capacitance detecting sensor circuit determines whether a person is approaching according to the capacitance, and implements a proximity detection scheme in the mobile terminal, and when it is determined that someone is close, the lowering is performed.
  • the maximum transmit power of the mobile terminal saves the internal space of the mobile terminal, reduces the design difficulty of the mobile terminal, reduces the cost, and is advantageous for miniaturization and thinning of the mobile terminal. At the same time, it also reduces the SAR value and reduces the impact of wireless radiation on mobile terminals.
  • the above units or steps of the embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed among multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they can be stored in the storage device Executed by the computing device. Alternatively, they may be fabricated into individual circuit modules, or a plurality of units or steps thereof may be fabricated as a single circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

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Abstract

一种接近检测装置，包括：移动终端天线本体和移动终端侧边金属条（10），用于检测所述移动终端天线本体和移动终端侧边金属条（10）之间所夹空间的电容；与所述移动终端天线本体和移动终端侧边金属条（10）电耦合连接的电容检测传感器电路（11），根据所述移动终端天线本体和移动终端侧边金属条（10）检测的电容判断是否有人接近，当判断出有人接近时输出指示信号以指示有人接近。通过移动终端天线本体和移动终端侧边金属条(10）检测其所夹空间的电容，电容检测传感器电路（11）根据所述电容判断是否有人接近，实现了接近检测方案，从而节省了移动终端内部空间，减小了移动终端设计难度，降低了成本，有利于移动终端的小型化与轻薄化。

Description

接近检测装置及移动终端
本申请要求于 2012年 2月 3日提交中国专利局、申请号为 201210023924.4、 发明名称为"接近检测装置及移动终端"的中国专利申请的优先权，其全部内 容通过引用结合在本申请中。
技术领域
本发明实施例涉及通信领域， 尤其是涉及一种接近检测装置及移动 终端。
背景技术
随着电子技术的发展， 移动终端 （如智能手机、 平板电脑、 便携式 个人电脑） 等无线产品正逐渐成为人们必不可少的生活与办公用品， 为 了防止无线产品过量的辐射对人的伤害， 美国联邦通信委员会和欧盟都 对无线产品的 SAR ( Specific Absorption Rate , 比吸收率 )值有严格的认 证规定。
为了降低产品的 SAR值，目前有些无线产品中会加入检测人接近和 离开的接近传感器， 当检测到人接近时， 降低发射功率从而降低产品对 人的辐射。
现有接近传感器技术方案是利用放置在天线附近的 FPC ( Flexible Printed Circuit, 柔性印刷电路板） 来检测电容变化的， 为了保证检测精 度和稳定性， FPC的面积一般要求在 28mm*25mm左右。 在天线附近增 加如此大的电容检测 FPC使得原本紧张的移动终端内部空间资源受到极 大的浪费， 不利于移动终端的小型化和轻薄化。
发明内容
为了解决上述问题， 本发明实施例提出一种接近检测装置及移动终 一方面， 本发明实施例提出了一种接近检测装置， 包括： 移动终端 天线本体和移动终端侧边金属条， 构成电容器的两极， 用于检测所述移 动终端天线本体和移动终端侧边金属条之间所夹空间的电容； 与所述移 动终端天线本体和移动终端侧边金属条分别电耦合连接的电容检测传感 器电路， 根据所述移动终端天线本体和移动终端侧边金属条检测的电容 判断是否有人接近， 当判断出有人接近时， 输出指示信号。
另一方面， 本发明实施例提出了一种移动终端， 包括接近检测装置， 所述接近检测装置包括： 移动终端天线本体和移动终端侧边金属条， 构 成电容器的两极， 用于检测所述移动终端天线本体和移动终端侧边金属 条之间所夹空间的电容； 与所述移动终端天线本体和移动终端侧边金属 条分别电耦合连接的电容检测传感器电路， 根据所述移动终端天线本体 和移动终端侧边金属条检测的电容判断是否有人接近， 当判断出有人接 近时， 输出指示信号。
本发明实施例中， 通过移动终端天线本体和移动终端侧边金属条检 测其所夹空间的电容， 电容检测传感器电路根据所述电容判断是否有人 接近， 实现了接近检测， 由于使用移动终端本身的天线本体和侧边金属 条， 故可节省移动终端内部空间， 减小移动终端设计难度， 降低成本， 有利于移动终端的小型化与轻薄化。
附图说明
图 1为一种移动终端的背面结构示意图；
图 2为本发明实施例中一种接近检测装置的结构示意图；
图 3为本发明实施例中又一种接近检测装置的结构示意图； 图 4为本发明实施例中又一种接近检测装置的结构示意图； 图 5为 AD7156芯片的引脚示意图；
图 6为 AD7156芯片的电路结构示意图； 图 7为本发明实施例中又一种接近检测装置的结构示意图； 图 8为本发明实施例中又一种接近检测装置的结构示意图； 图 9为本发明实施例中又一种接近检测装置的结构示意图； 图 10为本发明实施例中一种移动终端的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案 进行清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实 施例， 而不是全部的实施例。 基于本发明中的实施例， 本领域普通技术 人员在没有作出创造性劳动前提下所获得的所有其他实施例， 都属于本 发明保护的范围。 首先， 对以下各实施例中的用词和术语进行解释： 所谓 "移动终端" ， 是指其尺寸适于移动的各种终端通信设备， 包 括但不限于： 手机、 平板电脑、 便携式个人电脑等。
当以下各实施例提到曱与乙相 "耦合" 时， 是指通过曱的电信号与 通过乙的电信号发生物理上的确定关联， 这包括曱与乙通过导线等直接 连接， 或者通过另一个部件丙间接相连， 也包括曱与乙之间如变压器那 样通过电磁感应使经过各自的电信号发生关联。
当本发明实施例提及 "第一" 、 "第二" 等序数词时， 除非根据上 下文其确实表达顺序之意， 应当理解为仅仅是起区分之用。
现有的接近检测方案是在移动终端中使用单独的电容 FPC 来检测 移动终端周围的电容， 通过电容的变化来判断人的接近。 如图 1指示， 为一种移动终端的背面结构示意图，所述移动终端 100为长方体型结构， 有六个外部平面， 图 1 中示出了移动终端背面 110 , 以及移动终端左侧 面 130和移动终端下侧面 140 , 天线区域 120为所述移动终端 100的天 线本体在所述移动终端背面 110上的投影区域。 由于移动终端各个平面 的 SAR值都有严格的规定，所以需要在移动终端的各个平面特别是天线 所在的平面都要设置电容 FPC FPC的面积一般都在 28mm*25mm左右， 而天线发射平面的 FPC面积更是要大于天线的面积以能够覆盖天线发射 平面。 随着移动终端的小型化和轻薄化的趋势， 移动终端的内部空间本 就非常紧张， 在移动终端内部增加如此大面积的 FPC无疑会大大增加移 动终端的内部空间， 增加移动终端的设计难度。
发明人在实现本发明的过程中发现， 移动终端的天线本体和侧边金 属条构成的电容可以满足电容检测芯片前端检测电容范围的要求， 而且 当人接近时所述前端检测电容周围的介电常数变化引起的电容变化量可 以满足设计要求。 从而可以利用天线本体和侧边金属条构成的电容的变 化量来检测人接近的距离。 图 2为本发明实施例中一种接近检测装置的 结构示意图； 所述装置包括移动终端天线本体和移动终端侧边金属条 10 , 构成电容器的两极， 用于检测所述移动终端天线本体和移动终端侧 边金属条所夹空间的电容；
所述接近检测装置还包括电容检测传感器电路 11 , 所述电容检测传 感器电路 11与所述移动终端天线本体和移动终端侧边金属条 10电耦合 连接， 根据所述移动终端天线本体和移动终端侧边金属条检测的电容判 断是否有人接近， 当判断出有人接近时输出指示信号， 所述指示信号用 于指示有人接近。 具体的， 当有人接近所述接近检测装置时， 会引起所 述移动终端天线本体和移动终端侧边金属条 10 周围的介电常数发生变 化，从而使所述移动终端天线本体和移动终端侧边金属条 10检测的电容 发生变化，所述电容检测传感器电路 11根据所述电容变化判断是否有人 接近， 当判断出有人接近时， 输出有人接近指示信号， 如高电平或者低 电平。
本发明实施例中， 通过移动终端天线本体和移动终端侧边金属条检 测其所夹空间的电容， 电容检测传感器电路根据所述电容判断是否有人 接近， 实现了接近检测方案， 从而节省了移动终端内部空间， 减小了移 动终端设计难度， 降低了成本， 有利于移动终端的小型化与轻薄化。 图 3为本发明实施例中一种接近检测装置的结构示意图； 所述接近 检测装置包括移动终端天线本体和移动终端侧边金属条 10 和电容检测 传感器电路 11 , 其中所述电容检测传感器电路 11 包括电容数字转换器 211、 寄存器 212、 比较器 213 , 具体的：
所述移动终端天线本体和移动终端侧边金属条 10 ,用于检测所述移 动终端天线本体和移动终端侧边金属条 10之间所夹空间的电容。所述移 动终端天线本体和移动终端侧边金属条 10 中的移动终端天线本体和移 动终端侧边金属条分别相当于一个电容器的电容两极， 可以实时检测所 述移动终端天线本体和移动终端侧边金属条 10所夹空间的电容。当所述 移动终端天线本体和移动终端侧边金属条 10的周围环境发生变化时，例 如有人接近或者其他物体接近时， 会引起所述所述移动终端天线本体和 移动终端侧边金属条 10周围的介电常数发生变化，进一步会引起所述移 动终端天线本体和移动终端侧边金属条 10所检测到的电容发生变化。
所述电容数字转换器 211 , 用于获取所述移动终端天线本体和移动 终端侧边金属条 10所检测的电容，将所述电容转换为第一电容值。 由于 所述移动终端天线本体和移动终端侧边金属条 10 所检测的电容是一个 模拟信号， 在此需将所述电容转换为数字信号， 即第一电容值， 以便于 后续的处理。
所述寄存器 212中存储有第二电容门限值， 所述第二电容门限值为 人接近时对应的电容值。 所述第二电容门限值可以根据产品设计的实际 需要来确定， 例如在产品设计时确定当人与所述装置的距离小于 13mm 时即认为有人接近所述装置， 则可将人与所述装置相距 13mm时所述移 动终端天线本体和移动终端侧边金属条检测的电容所对应的电容值设定 为所述第二电容门限值， 所述第二电容门限值作为判断人是否接近所述 装置的电容值临界点。 所述比较器 213 , 用于根据所述第一电容值和所述第二电容门限值 判断是否有人接近， 当判断出有人接近时输出指示信号， 所述指示信号 用于指示有人接近。
基于所述电容数字转换器 211电容转换的方式， 当人接近时， 所述 第一电容值可能会变大， 或者也可能会变小。 根据所述电容数字转换器 211电容转换的方式， 所述比较器 213可釆用不同的比较模式。
具体的， 当人接近时若所述第一电容值变大， 则比较所述第一电容 值是否大于所述第二电容门限值， 当所述第一电容值大于所述第二电容 门限值时， 输出指示信号， 所述指示信号用于指示有人接近； 或者， 当 人接近时若所述第一电容值变小， 则比较所述第一电容值是否小于所述 第二电容门限值， 当所述第一电容值小于所述第二电容门限值时， 输出 指示信号， 所述指示信号用于指示有人接近。
进一步的， 所述指示信号可以为高电平， 或者也可以为低电平。 具 体的， 若没有人接近时所述比较器 213输出低电平， 当有人接近时则输 出高电平以指示有人接近； 或者没有人接近时所述比较器输出高电平， 当有人接近时则输出低电平以指示有人接近。
本发明实施例中， 通过移动终端天线本体和移动终端侧边金属条检 测其所夹空间的电容， 电容检测传感器电路根据所述电容判断是否有人 接近， 实现了接近检测方案， 从而节省了移动终端内部空间， 减小了移 动终端设计难度， 降低了成本， 有利于移动终端的小型化与轻薄化。
如图 4所示，为本发明实施例中另一种接近检测装置的结构示意图； 所述接近检测装置包括移动终端天线本体和移动终端侧边金属条 10 和 电容检测传感器电路 11 , 其中所述电容检测传感器电路 11 包括电容数 字转换器 311、 寄存器 312、 计算器 313、 比较器 314 , 具体的：
所述移动终端天线本体和移动终端侧边金属条 10 ,用于检测所述移 动终端天线本体和移动终端侧边金属条 10所夹空间的电容。所述移动终 端天线本体和移动终端侧边金属条 10 中的移动终端天线本体和移动终 端侧边金属条分别相当于一个电容器的电容两极， 可以实时检测所述移 动终端天线本体和移动终端侧边金属条 10所夹空间的电容。当所述移动 终端天线本体和移动终端侧边金属条 10的周围环境发生变化时，例如有 人接近或者其他物体接近时， 会引起所述移动终端天线本体和移动终端 侧边金属条 10周围的介电常数发生变化，进一步会引起所述移动终端天 线本体和移动终端侧边金属条 10所检测到的电容发生变化。
所述电容数字转换器 311 , 用于获取所述移动终端天线本体和移动 终端侧边金属条 10所检测的电容，将所述电容转换为第一电容值。 由于 所述移动终端天线本体和移动终端侧边金属条 10 所检测的电容是一个 模拟信号， 在此需将所述电容转换为数字信号， 即第一电容值， 以便于 后续的处理。
所述寄存器 312 , 存储有第三电容值和第四电容差值， 所述第三电 容值为没有人接近时的电容值， 所述第四电容差值为有人接近时的电容 值与所述第三电容值的差值。
所述第四电容差值可以根据产品设计的实际需要来确定， 例如在产 品设计时确定当人与所述装置的距离小于 13mm时， 则认为有人接近所 述装置， 则可将人与所述装置相距 13mm时所述终端天线本体检测的电 容所对应的电容值与所述三电容值的差值作为判断人是否接近所述装置 的电容值临界点。
所述计算器 313 , 用于计算所述第一电容值与所述第三电容值之间 的第五电容差值。
所述比较器 314 , 用于比较所述第五电容差值是否大于所述第四电 容差值， 当所述第五电容差值大于所述第四电容差值时， 输出指示信号， 所述指示信号用于指示有人接近。
进一步的， 所述指示信号可以为高电平， 或者也可以为低电平。 具 体的， 若没有人接近时所述比较器 314输出低电平， 当有人接近时则输 出高电平以指示有人接近； 或者没有人接近时所述比较器 314输出高电 平， 当有人接近时则输出低电平以指示有人接近。
本发明实施例中， 通过移动终端天线本体和移动终端侧边金属条检 测其所夹空间的电容， 电容检测传感器电路根据所述电容判断是否有人 接近， 实现了接近检测方案， 从而节省了移动终端内部空间， 减小了移 动终端设计难度， 降低了成本， 有利于移动终端的小型化与轻薄化。
所述电容检测传感器电路可以为电容转换器， 电容转换器是一种电 容接近检测传感器芯片， 可以根据输出的电容信号判断是否有人接近， 并输出有人接近的指示信号。
如图 5所示， 为 AD7156的引脚示意图。 AD7156是 ADI ( Analog Devices ,亚德诺半导体）公司生产的一种双通路电容转换器（ Capacitance Converter ) , 如图所示， AD7156有 10个引脚， 具体的， 各个引脚的名 称及功能如下：
Figure imgf000009_0001
在使用中， 可以只使用一个通路， 也可以同时使用两个通路。 例如, 将 AD7156的 CIN1与移动终端天线本体电耦合连接， EXC1与移动终端 侧边金属条电耦合连接， AD7156 根据输入的电容判断是否有人接近， 当判断出有人接近时， 从 OUT1输出高电平信号。 也可以将 AD7156的 CIN2和 EXC2分别与另一个 FPC电容器的两极相连， 构成另一通路。
如图 6所示， 为本发明实施例中 AD7156的电路结构示意图， 所述 电路包括两个通路： 第一检测电容 501所在的第一电容通路， 第一检测 电容 501 的两个电容极分别与 AD7156的 CIN1和 EXC1连接， 形成第 一电容通路；第二检测电容 502所在的第二电容通路，第二检测电容 502 的两个电容极分别与 AD7156的 CIN2和 EXC2连接， 形成第二电容通 路。 两个通路的选择是通过双路开关 503实现的， 当双路开关 503连接 到第一电容通路时， AD7156获取所述第一检测电容 501所检测的电容， 当双路开关 503连接到第二电容通路时， AD7156获取所述第二检测电 容 502所检测的电容。
下面以 AD7156对第一检测电容 501检测的电容信号的处理过程为 例， 描述 AD7156逻辑结构及各模块功能。 如图 6所示， 当双路开关 503 选择第一电容通路时， 第一检测电容 501检测的电容信号通过 CIN1和 EXC1输入到 AD7156; 所述电容信号为模拟信号， 通过电容数字转换器 505 将所述电容信号转换为数字信号， 即第一电容值； 由于第一检测电 容 501 检测的电容受环境影响可能会在小范围内有所变化或者有噪声 等， 所以所述第一电容值并不稳定会在小范围内上下浮动， 所以需要再 经过数字滤波器 506的滤波处理， 如求平均等， 得到一个较为稳定的第 一电容值； 所述第一电容值输入到第一比较器 509; 同时第一门限寄存 器 510 中存储的第二电容门限值也输入到第一比较器 509, 所述第二电 容门限值为人接近时所述第一检测电容 501检测到的电容所对应的电容 值； 所述第一比较器 509比较所述第一电容值是否大于所述第二电容门 限值， 当所述第一电容值大于所述第二电容门限值时， 输出高电平， 以 指示有人接近。 所述高电平通过 OUT1输出。
可选的， 基于所述电容数字转换器 505的转换方式， 当人接近时所 述第一电容值也可能变小， 此时所述第一比较器 509比较所述第一电容 值是否小于所述第二电容门限值， 当所述第一电容值小于所述第二电容 门限值时， 所述第一比较器输出高电平， 以指示有人接近。 所述高电平 通过 OUT1输出。
AD7156还包括有第二门限寄存器 507和第二比较器 508 ,所述第二 门限寄存器 507存储有第三电容门限值， 所述第三电容门限值为人接近 时所述第二检测电容 502检测到的电容所对应的电容值。 所述第二比较 器 508与所述第一比较器 509的工作原理相同， 当 AD7156选择所述第 二电容通路时， 所述第二比较器 508比较所述第二检测电容 502检测的 电容所对应的电容值是否大于所述第三电容门限值， 当所述第二检测电 容 502检测的电容所对应的电容值大于所述第三电容门限值时， 所述第 二比较器 508输出高电平， 以指示有人接近。 所述高电平通过 OUT2输 出。
如图 7所示，为本发明实施例中又一种接近检测装置的结构示意图， 所述接近检测装置包括移动终端天线本体 6011 , 移动终端侧边金属条 6012和 AD7156芯片 602 , 所述移动终端天线本体 6011与所述 AD7156 芯片 602的第 4引脚即 CIN1相连， 所述移动终端侧边金属条 6012与所 述 AD7156芯片 602的第 6引脚即 EXC1相连， 所述移动终端天线本体 6011 和移动终端侧边金属条 6012构成电容器的两极， 检测所述移动终 端天线本体 6011和移动终端侧边金属条 6012构成电容器所夹空间的电 容，并将检测的所述电容信号输入到所述 AD7156芯片 602 ,所述 AD7156 芯片判断是否有人接近的方法可参考图 5实施例的描述， 并输出有人接 近的指示信号。
本发明实施例中， 通过移动终端天线本体和移动终端侧边金属条检 测其所夹空间的电容， 电容检测传感器电路根据所述电容判断是否有人 接近， 实现了接近检测方案， 从而节省了移动终端内部空间， 减小了移 动终端设计难度， 降低了成本， 有利于移动终端的小型化与轻薄化。
进一步的， 如图 8所示， 为了降低移动终端天线本体周围的金属条 或走线对天线性能造成的影响，可以在所述移动终端天线本体 6011和所 述 AD7156芯片 602之间串联连接高频电感 603 , 所述高频电感 603的 电感值可以为 82纳亨， 或者 68纳亨。 当然， 如果所述 AD7156芯片由 其他的电容检测传感器电路替代实现， 也可在所述终端天线本体和电容 检测传感器电路之间串联连接高频电感。
如图 9所示，为本发明实施例中又一种接近检测装置的结构示意图， 所述接近检测装置包括移动终端天线本体 7011 , 移动终端侧边金属条 7012和电容检测传感器电路 702 ,所述移动终端天线本体 7011和所述移 动终端侧边金属条 7012分别连接所述电容检测传感器电路 702 , 所述移 动终端天线本体 7011和所述移动终端侧边金属条 7012构成电容器的两 极， 用以检测所述移动终端天线本体 7011 和移动终端侧边金属条 7012 构成电容器所夹空间的电容， 并将检测的所述电容信号输入到所述电容 检测传感器电路 702 , 所述电容检测传感器电路 702根据所述电容信号 判断是否有人接近， 并输出有人接近的指示信号。 其中所述电容检测传 感器电路 702根据所述电容信号判断是否有人接近可参考前述实施例的 描述。 进一步的， 为了降低所述移动终端天线本体 7011周围的金属条或 走线对天线性能造成的影响，可以在所述移动终端天线本体 7011和所述 电容检测传感器电路 702之间串联连接高频电感 703 ,所述高频电感 703 的电感值可以为 82纳亨， 或者 68纳亨。
进一步的， 所述接近检测装置可以用于各种移动终端中， 包括但不 限于智能手机、 平板电脑、 便携式个人电脑等。 通过所述接近检测装置 检测到人接近时， 移动终端调节其无线信号的发射功率， 以满足 SAR值 的规定，减小对人的辐射。如图 10所示，为一种移动终端的结构示意图， 所述移动终端包括有移动终端天线本体和移动终端侧边金属条 801、 电 感检测传感器电路 802、 基带处理器 803、 射频收发器 804 , 所述移动终 端天线本体和移动终端侧边金属条 801检测所述移动终端天线本体和移 动终端侧边金属条 801 所在空间的电容； 所述电容检测传感器电路 802 获取所述移动终端天线本体和移动终端侧边金属条 801所检测的电容， 根据所述电容判断是否有人接近， 并输出指示信号， 所述指示信号用于 指示是否有人接近； 所述基带处理器 803获取所述指示信号， 当输出的 指示信号指示有人接近时， 所述基带处理器 803根据所述指示信号调节 所述射频收发器 804的最大发射功率。 其中， 所述电容检测传感器电路 802根据所述移动终端天线本体和移动终端侧边金属条 801检测的电容 判断是否有人接近的方法可参考前述实施例的描述。
本发明实施例中， 通过移动终端天线本体检测其所夹空间的电容， 电容检测传感器电路根据所述电容判断是否有人接近， 实现了移动终端 中的接近检测方案， 当判断出有人接近时， 降低移动终端的最大发射功 率， 从而节省了移动终端内部空间， 减小了移动终端设计难度， 降低了 成本， 有利于移动终端的小型化与轻薄化。 同时， 也降低了 SAR值， 减 小了移动终端无线辐射对人的影响。
以上实施例中分别说明的各模块、 装置以及各实施例中分别说明的 技术特征可以进行组合， 从而形成不脱离本发明的精神和原则之内的其 他的模块、装置及技术， 这些根据本发明实施例的记载组合而成的模块、 装置及技术均在本发明的保护范围之内。
显然， 本领域的技术人员应该明白， 上述的本发明实施例的各单元 或各步骤可以用通用的计算装置来实现， 它们可以集中在单个的计算装 置上， 或者分布在多个计算装置所组成的网络上， 可选地， 它们可以用 计算装置可执行的程序代码来实现， 从而， 可以将它们存储在存储装置 中由计算装置来执行。 或者将它们分别制作成各个电路模块， 或者将它 们中的多个单元或步骤制作成单个电路模块来实现。 这样， 本发明不限 制于任何特定的硬件和软件结合。
以上所述， 仅为本发明较佳的具体实施方式， 但本发明的保护范围 并不局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内， 可轻易想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应该以权利要求的保护范围为准。

Claims

权利要求
1、 一种接近检测装置， 其特征在于,包括：
移动终端天线本体和移动终端侧边金属条， 构成电容器的两极， 用 于检测所述移动终端天线本体和移动终端侧边金属条所夹空间的电容； 与所述移动终端天线本体和移动终端侧边金属条分别电耦合连接的 电容检测传感器电路， 根据所述移动终端天线本体和移动终端侧边金属 条检测的电容判断是否有人接近， 当判断出有人接近时， 输出指示信号。
2、 根据权利要求 1所述的装置， 其特征在于， 所述电容检测传感器 电路包括电容数字转换器、 寄存器、 比较器， 其中：
所述电容数字转换器， 用于将所述移动终端天线本体和移动终端侧 边金属条检测检测的电容转换为第一电容值；
所述寄存器， 用于存储第二电容门限值， 所述第二电容门限值为有 人接近时对应的电容值；
所述比较器， 用于根据所述第一电容值和所述第二电容门限值判断 是否有人接近， 当判断出有人接近时输出指示信号， 所述指示信号用于 指示有人接近。
3、根据权利要求 2所述的装置，其特征在于，所述比较器具体用于： 当人接近时， 若所述第一电容值变大， 则比较所述第一电容值是否 大于所述第二电容门限值， 当所述第一电容值大于所述第二电容门限值 时， 输出指示信号， 所述指示信号用于指示有人接近； 或者
当人接近时， 若所述第一电容值变小， 则比较所述第一电容值是否 小于所述第二电容门限值， 当所述第一电容值小于所述第二电容门限值 时， 输出指示信号， 所述指示信号用于指示有人接近。
4、 根据权利要求 1所述的装置， 其特征在于， 所述电容检测传感器 电路包括电容数字转换器、 寄存器、 计算器、 比较器， 其中：
所述电容数字转换器， 用于将所述移动终端天线本体和移动终端侧 边金属条检测的电容转换为第一电容值；
所述寄存器， 用于存储第三电容值和第四电容差值， 所述第三电容 值为没有人接近时对应的电容值， 所述第四电容差值为有人接近时的电 容值与所述第三电容值的差值；
所述计算器， 用于计算所述第一电容值与所述第三电容值之间的第 五电容差值；
所述比较器， 用于比较所述第五电容差值是否大于所述第四电容差 值， 当所述第五电容差值大于所述第四电容差值时， 输出指示信号， 所 述指示信号用于指示有人接近。
5、 根据权利要求 1至 4任一项所述的装置， 其特征在于， 所述指示 信号为高电平或者低电平。
6、 根据权利要求 1所述的装置， 其特征在于， 所述电容检测传感器 电路为电容转换器。
7、 根据权利要求 1至 6任一项所述的装置， 其特征在于， 还包括高 频电感， 所述高频电感串联连接在所述移动终端天线本体与所述电容检 测传感器电路之间。
8、 根据权利要求 7所述的装置， 其特征在于， 所述高频电感的电感 值为 82纳亨， 或者 68纳亨。
9、 一种移动终端， 其特征在于， 包括权利要求 1至 8任一项所述的 接近检测装置。
10、 根据权利要求 9所述的移动终端， 还包括基带处理芯片、 射频 收发器， 其特征在于：
所述基带处理芯片接收所述接近检测装置输出的指示信号， 并根据 所述指示信号降低所述射频收发器的最大发射功率。
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