WO2020062077A1 - 一种电路及电子设备 - Google Patents

一种电路及电子设备 Download PDF

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Publication number
WO2020062077A1
WO2020062077A1 PCT/CN2018/108447 CN2018108447W WO2020062077A1 WO 2020062077 A1 WO2020062077 A1 WO 2020062077A1 CN 2018108447 W CN2018108447 W CN 2018108447W WO 2020062077 A1 WO2020062077 A1 WO 2020062077A1
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WO
WIPO (PCT)
Prior art keywords
circuit
touch
antenna
inductor
capacitor
Prior art date
Application number
PCT/CN2018/108447
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English (en)
French (fr)
Inventor
程树青
Original Assignee
深圳市汇顶科技股份有限公司
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 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2018/108447 priority Critical patent/WO2020062077A1/zh
Priority to CN201880001713.6A priority patent/CN109496395A/zh
Publication of WO2020062077A1 publication Critical patent/WO2020062077A1/zh

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    • 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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • 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
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960735—Capacitive touch switches characterised by circuit details

Definitions

  • the embodiments of the present application relate to the field of touch control, and in particular, to a circuit and an electronic device.
  • a Bluetooth headset needs functions such as volume control and song switching.
  • a single button cannot solve the problem, but multiple buttons require more space.
  • the electronic device becomes larger.
  • the diversification of functions also requires a larger battery to support, it will also occupy a larger space, and will also cause the electronic device to become larger.
  • the space occupied by the antenna is large, the touch area will be reduced and the detection will be insensitive.
  • the purpose of the embodiments of the present application is to provide a circuit and an electronic device.
  • the antenna is a detection electrode, so that when a user's finger touches the antenna, a change in the capacitance of the antenna can be detected by the touch chip, which triggers the electronic device to perform a touch operation. Corresponding instruction. Therefore, the two functions of the antenna and the touch are realized through the antenna, the functions of the touch and the antenna are effectively integrated, and the circuit designed in this application occupies a small volume, and the touch operation is more sensitive.
  • an embodiment of the present application provides a circuit, which is applied to an electronic device.
  • the circuit includes: an antenna, a touch chip, and a communication chip; the antenna is a detection electrode, and the detection electrode
  • the touch chip and the communication chip are respectively electrically connected; when a finger touches the antenna, the capacitance of the antenna changes, the touch chip detects the change in the capacitance and triggers the The electronic device executes a command corresponding to a touch operation.
  • An embodiment of the present application further provides an electronic device including at least one touch key and the above circuit; one of the touch keys is formed by the antenna.
  • the antenna is formed by a detection electrode, and the detection electrode is electrically connected to the touch chip and the communication chip, respectively.
  • the touch chip detects the change in the capacitance, and the touch chip triggers the electronic device to execute a command corresponding to the touch operation.
  • the capacitance of the antenna changes. Since the antenna and the touch chip are electrically connected, the change in the capacitance of the antenna can be detected by the touch chip, and the touch chip can trigger the execution of the electronic device. Commands corresponding to touch operations.
  • the antenna and touch functions can be implemented through the antenna at the same time, that is, the antenna can realize the communication function and also the function of the touch key, effectively integrate the touch and the function of the antenna, and the circuit designed in this application
  • the occupied volume is small and the touch operation is more sensitive.
  • the length of the antenna is a quarter of the wavelength of the signal in the working frequency band of the antenna. Designing the length of the antenna to a quarter of the working wavelength of the antenna can make the antenna have better radiation ability.
  • the circuit further includes a high-pass filter circuit; the high-pass filter circuit is electrically connected between the detection electrode and the communication chip.
  • the high-pass filter circuit includes a third capacitor, a fourth capacitor, and a first inductor; the third capacitor and the fourth capacitor are connected in series between the detection electrode and the communication chip, and the first inductor One end is connected between the third capacitor and the fourth capacitor, and the other end of the first inductor is connected to the system ground.
  • the circuit further includes a low-pass filter circuit; the low-pass filter circuit is electrically connected between the detection electrode and the touch chip.
  • the low-pass filter circuit includes a second inductor, a third inductor, and a fifth capacitor; the second inductor and the third inductor are connected in series between the detection electrode and the touch chip, and the first One end of the five capacitors is connected between the second inductor and the third inductor, and the other end of the fifth capacitor is connected to the system ground.
  • the circuit also includes a battery and an isolation circuit for isolating the battery from the system ground, and the isolation circuit is a lumped parameter circuit or a microstrip filter circuit. Because the isolation circuit isolates the battery's negative electrode from the system ground, the battery will not have a shielding effect on the antenna's radiation, so the distance between the battery and the antenna can be set closer, reducing the size of the electronic device.
  • the isolation circuit is a lumped parameter circuit including a common mode choke;
  • the common mode choke includes a first common mode inductor and a second common mode inductor; and one end of the first common mode inductor is connected The other end of the battery negative terminal is connected to the system ground; one end of the second common mode inductor is connected to the positive terminal of the battery, and the other end is connected to a preset voltage. Since the high-frequency signal radiated by the antenna can be isolated from the system ground by the common mode choke coil, and will not be absorbed by the system, the radiation performance of the antenna can be improved by the common mode choke coil.
  • the isolation circuit is a lumped parameter circuit, including: a first separation inductor, a second separation inductor, and a separation capacitor; the first separation inductor, the separation capacitor, and the separation second inductor are connected in series in the order Between a positive electrode and a negative electrode of the battery, a connection terminal of the first separation inductor and the separation capacitor is used to connect a preset voltage, and a connection terminal of the second separation inductor and the separation capacitor is connected to a system ground.
  • This circuit design can prevent the battery from affecting the radiation performance of the antenna.
  • the isolation circuit is a microstrip filter circuit, including: a first microstrip line, a second microstrip line, and a seventh capacitor; the first microstrip line, the seventh capacitor, and the second microstrip
  • the strip line is connected in series between the positive electrode and the negative electrode of the battery, the connection between the first microstrip line and the seventh capacitor is connected to a preset voltage, and the second microstrip line and the seventh capacitor Connect the termination system ground.
  • This circuit design can provide another specific form of isolation circuit, which helps to match the different design requirements of the user's design process.
  • the touch key includes a first touch key, a second touch key, and a third touch key; the third touch key is formed by the antenna and is located between the first touch key and the third touch key Between the second touch keys.
  • the third touch key is located between the first touch key and the second touch key, and the first touch key, the second touch key, and the third touch key
  • the outer contour shape formed by the key combination is circular. With this design, the space occupied by the antenna is relatively concentrated. When the shape of the electronic device is circular, it helps to match the shape of the electronic device, and the design takes up less space.
  • first touch key, the second touch key, and the third touch key are arranged in order, the first touch key and the second touch key are rectangular, and the third The touch keys are serpentine.
  • the electronic device is an earphone, a watch, or a bracelet, so that the universality of the present application can be improved.
  • FIG. 1 is a structural block diagram of a circuit according to a first embodiment of the present application
  • FIG. 2 is a schematic structural diagram of an antenna according to a first embodiment of the present application.
  • FIG. 3 is a structural diagram of a circuit according to a second embodiment of the present application.
  • FIG. 4 is a structural diagram of an auxiliary function module circuit according to a third embodiment of the present application.
  • FIG. 5 is a structural diagram of an isolation circuit according to a third embodiment of the present application.
  • FIG. 6 is another structural diagram of an isolation circuit according to a third embodiment of the present application.
  • FIG. 7 is a schematic diagram of a circuit structure of an electronic device according to a fifth embodiment of the present application.
  • FIG. 8 is a diagram illustrating an electronic device according to a fifth embodiment of the present application.
  • a first embodiment of the present application relates to a circuit applied to an electronic device.
  • the circuit includes: an antenna 11, a touch chip 12, and a communication chip 13.
  • the antenna 11 is a detection electrode
  • the detection electrode is electrically connected to the touch chip 12 and the communication chip 13 respectively.
  • the capacitance of the detection electrode changes, and the touch chip 12 detects the change in the capacitance, and triggers the electronic device to execute an instruction corresponding to a touch operation.
  • the antenna 11 of the present application is formed of a detection electrode, and the detection electrodes are electrically connected to the touch chip 12 and the communication chip 13, respectively.
  • the capacitance of the detection electrode changes, and the touch chip 12 detects the change in the capacitance, and triggers the electronic device to execute an instruction corresponding to the touch operation. That is, when the user's finger touches the antenna 11, the capacitance of the antenna 11 changes. Since the antenna 11 and the touch chip 12 are electrically connected, the change in the capacitance of the antenna 11 can be detected by the touch chip 12
  • the chip 12 may trigger an electronic device to execute an instruction corresponding to a touch operation.
  • the antenna 11 in the embodiment of the present application can perform a communication function and a touch function at the same time.
  • the antenna 11 and the touch function are simultaneously implemented by the antenna 11, and the functions of the touch and the antenna 11 are effectively integrated, and the circuit designed in this application occupies a small volume, and the touch operation is more sensitive.
  • the touch chip 12 is provided with an integration circuit 14 and a processing unit 121 for detecting the capacitance of the detection electrode.
  • the detection electrode is electrically connected to an input terminal of the integration circuit 14, and an output terminal of the integration circuit 14 is electrically connected to the processing unit 121.
  • the processing unit 121 detects a change in the voltage at the output terminal of the integration circuit 14, and triggers the electronic device to execute an instruction corresponding to a touch operation. Therefore, the touch function is implemented, and a specific implementation form for detecting a finger touch is provided, which is helpful to improve the feasibility of the present application.
  • a parasitic capacitance C KG is formed between the detection electrode and the system ground, that is, a parasitic capacitance C KG is formed between the antenna 11 and the system ground.
  • the capacitance of the detection electrode was C KG .
  • a first capacitance C FK is formed between the finger and the detection electrode, that is, a first capacitance C FK is formed between the finger and the antenna 11, and a second capacitance C FG is formed between the finger and the system ground.
  • the capacitance of the detection electrode is the total capacitance of C KG , C FK and C FG . Because C FK and C FG are connected in series with C KG in parallel. Therefore, the amount of change in capacitance ⁇ C is the total capacitance of C FK and C FG .
  • ⁇ C C FK * C FG / (C FK + C FG ).
  • U K is a preset coding voltage injected by the circuit system 10 to the detection electrode.
  • the processing unit 121 can recognize that the voltage at the output terminal of the integrating circuit 14 changes, so that it can be determined that a finger touches the antenna 11.
  • the length of the antenna 11 is a quarter of the signal wavelength of the operating frequency band of the antenna 11. Designing the length of the antenna 11 to a quarter of the wavelength of the signal in the working frequency band of the antenna 11 can make the antenna 11 have better radiation capability.
  • the antenna 11 of this embodiment may be designed as a snake-shaped structure. It is worth mentioning that the antenna 11 is not limited to a serpentine structure. Any shape that can ensure that the length of the antenna 11 is a quarter of the wavelength of the signal in the working frequency band of the antenna 11 is within the protection scope of the present application.
  • the Bluetooth frequency band is 2.4 GHz
  • the length of the antenna 11 is designed to be a quarter of the signal wavelength in the frequency band, which has good radiation ability.
  • the antenna 11 of the present application is not limited to a Bluetooth antenna.
  • the antenna 11 can be designed as a Zigbee antenna (Zigbee is a low-power local area network protocol based on the IEEE802.15.4 standard) or a WiFi antenna (WiFi is an Electronic devices are connected to a wireless local area network (LAN) technology, etc., and no further examples are given here.
  • the circuit further includes a high-pass filter circuit 15.
  • the high-pass filter circuit 15 is electrically connected between the antenna 11 and the communication chip 13.
  • the low frequency signals can be filtered by this circuit design (for example, the filtered U K), while avoiding large impedance changes due to the radio frequency circuit (including an antenna member 11, etc.) caused by the change of the detection of the capacity of Measurement error.
  • the specific form of the high-pass filter circuit 15 may be a lumped parameter circuit or a microstrip filter circuit.
  • the circuit also includes a low-pass filter circuit 16.
  • the low-pass filter circuit 16 is electrically connected between the detection electrode and the touch chip 12. This circuit design can reduce the interference of high-frequency signals on touch detection.
  • the high-frequency signals here are the high-frequency signals injected by the Bluetooth signal during transmission, and the parasitic effects of the touch circuit can be avoided to affect the reception performance of the antenna 11. , Can make the antenna 11 work independently.
  • the specific form of the low-pass filter circuit 16 may be a lumped parameter circuit or a microstrip filter circuit.
  • the antenna 11 can perform communication and touch simultaneously. Two functions.
  • this embodiment makes it possible to detect a change in the capacitance of the antenna 11 through the touch chip 12 when the user touches the antenna 11 with a finger, and trigger the electronic device to execute an instruction corresponding to the touch operation. Therefore, the two functions of the antenna 11 and the touch can be realized by the antenna 11 at the same time, and the functions of the touch and the antenna 11 are effectively integrated, and the circuit designed by the present application occupies a small volume and the touch operation is more sensitive.
  • a second embodiment of the present application relates to a circuit applied to an electronic device. This embodiment is further improved based on the first embodiment. The main improvement lies in that this embodiment provides specific forms of a high-pass filter circuit, a low-pass filter circuit, and an integration circuit.
  • the circuit further includes a high-pass filter circuit 15.
  • the high-pass filter circuit 15 is electrically connected between the detection electrode and the communication chip 13.
  • the high-pass filter circuit includes two capacitors and one inductor, respectively: a third capacitor C1, a fourth capacitor C2, and a first inductor L1. Two capacitors are connected in series between the detection electrode and the communication chip 13, one end of the first inductor L1 is connected between the two capacitors, and the other end is connected to the system ground.
  • the third capacitor C1 and the fourth capacitor C2 are connected in series between the detection electrode and the communication chip 13, one end of the first inductor L1 is connected to a connection terminal between the two capacitors, and the other end of the first inductor L1 Connect to system ground.
  • a specific circuit form of a high-pass filter circuit is provided.
  • the high-pass filter circuit can be designed as a lumped parameter circuit or the high-pass filter circuit can be designed as a microstrip filter circuit.
  • the circuit also includes a low-pass filter circuit 16.
  • the low-pass filter circuit 16 is electrically connected between the detection electrode and the touch chip 12. This circuit design can reduce the interference of high-frequency signals on touch detection.
  • the high-frequency signals here are the high-frequency signals injected by the Bluetooth signal during transmission, and the parasitic effects of the touch circuit can be avoided to affect the reception performance of the antenna 11. , Can make the antenna 11 work independently.
  • the specific form of the low-pass filter circuit 16 may be a lumped parameter circuit or a microstrip filter circuit.
  • the low-pass filter circuit includes two inductors and one capacitor, respectively: a second inductor L2, a third inductor L3, and a fifth capacitor C3.
  • the fifth capacitor C3 is connected between the two inductors, and the other end is connected to the system ground. That is, the second inductor L2 and the third inductor L3 are connected in series between the detection electrode and the touch chip 12, one end of the fifth capacitor C3 is connected to a connection terminal between the two inductors, and the fifth capacitor C3 The other end is connected to the system ground.
  • a specific circuit form of a low-pass filter circuit is provided, and in the actual design, the low-pass filter circuit can be designed as a lumped parameter circuit or the high-pass filter circuit can be designed as a microstrip filter circuit. .
  • the capacitance of the fifth capacitor C3 cannot be too large. If the capacitance of the fifth capacitor C3 is too large to exceed the load capacity of the touch chip 12, the touch chip 12 cannot implement the touch function.
  • this embodiment includes both the above-mentioned high-pass filter circuit 15 and low-pass filter circuit 16.
  • the high-pass filter circuit 15 can filter out low-frequency signals while avoiding the above-mentioned detection capacitance due to impedance changes of the RF circuit. Changes in the measurement result in larger measurement errors.
  • the low-pass filter circuit 16 can reduce the interference of high-frequency signals on touch detection, and at the same time can avoid the parasitic effect of the touch circuit from affecting the receiving performance of the antenna 11, and can make the antenna 11 work independently.
  • the branch performing the communication function and the branch performing the touch function do not affect each other. Therefore, the antenna 11 can perform two functions of communication and touch simultaneously.
  • a third embodiment of the present application relates to a circuit applied to an electronic device. This embodiment is further improved based on the first embodiment.
  • the main improvement is that the circuit further includes a battery and an isolation circuit for isolating the battery from the system ground.
  • the isolation circuit may be a lumped parameter circuit or a microstrip filter circuit. The specific form of the isolation circuit is briefly described below:
  • the isolation circuit is a lumped parameter circuit and includes a common mode choke coil 18.
  • the common mode choke coil 18 includes a first common mode inductor and a second common mode inductor. One end of the first common mode inductor is connected to a battery negative electrode, and the other end is connected to a system ground GND. One end of the second common mode inductor is connected to a battery positive electrode, and the other end is connected to a preset voltage V BAT . Since the high-frequency signal radiated by the antenna 11 can be isolated from the system ground by the common mode choke coil and will not be absorbed by the system, the high frequency signal on the antenna can be isolated from the system by the common mode choke coil.
  • the common mode rejection ratio of the common mode choke coil 18 is very large, the high frequency signal radiated by the antenna 11 will not be coupled to the system ground through the common mode choke coil 18 and the battery negative electrode, and the antenna 11 will not be radiated.
  • the high-frequency signal is absorbed by the circuit system, but the energy of the high-frequency signal is radiated out. Therefore, the radiation performance of the antenna 11 can be improved by the common mode choke coil 18.
  • the isolation circuit is a lumped parameter circuit, and includes: a first separation inductor L_Battery, a second separation inductor L_GND, and a separation capacitor C_filter.
  • the first separation inductor L_Battery, the separation capacitor C_filter, and the second separation inductor L_GND are connected in series between the positive electrode and the negative electrode of the battery in sequence.
  • Connected to the preset voltage V-Battery, and the connection between the second separation inductor L_GND and the separation capacitor C_filter is connected to the system ground. This circuit design can prevent the battery from affecting the radiation performance of the antenna.
  • the isolation circuit is a microstrip filter circuit, and includes a first microstrip line W1, a second microstrip line W2, and a seventh capacitor C7.
  • the first microstrip line W1, the seventh capacitor C7, and the second microstrip line W2 are connected in series between a positive electrode and a negative electrode of the battery in this order.
  • the connection between the first microstrip line W1 and the seventh capacitor C7 is terminated with a preset voltage V BAT
  • the connection between the second microstrip line W2 and the seventh capacitor C7 is terminated with the system ground GND.
  • the first microstrip line W1 and the second microstrip line W2 are both snake-shaped structures and have the same length.
  • the equivalent input impedance of the isolation circuit is Z in .
  • Z 0 and Z L are the impedances of the first microstrip line W1 and the second microstrip line W2, respectively.
  • the isolation circuit isolates the negative electrode of the battery from the system ground in this embodiment, the battery does not have a shielding effect on the radiation of the antenna, so that the distance between the battery and the antenna can be set closer. Reduce the size of electronic equipment.
  • a fourth embodiment of the present application relates to an electronic device.
  • the electronic device includes at least one touch key and the circuit of the first, second or third embodiment, and one of the touch keys is formed by the antenna.
  • the electronic device in this embodiment may be, but is not limited to, an earphone, a watch, or a bracelet, so that the universality of the present application can be improved.
  • the antenna in the circuit is a Bluetooth antenna
  • the headset can be a Bluetooth headset
  • the watch can be a Bluetooth watch
  • the bracelet can be a Bluetooth bracelet.
  • the electronic device of this embodiment can simultaneously implement two functions of an antenna and a touch control through an antenna.
  • this embodiment is an example of a device corresponding to the first, second or third embodiment, and this embodiment can be implemented in cooperation with the first, second or third embodiment.
  • the related technical details mentioned in the first, second or third embodiments are still valid in this embodiment, and in order to reduce repetition, they are not repeated here.
  • the relevant technical details mentioned in this embodiment can also be applied in the first, second or third embodiment.
  • a fifth embodiment of the present application relates to an electronic device. This embodiment is further improved on the basis of the fourth embodiment. The main improvement is that this embodiment includes other touch keys in addition to the touch keys formed by the antenna according to the fourth embodiment. .
  • the touch keys of the electronic device include a first touch key 62, a second touch key 63, and a third touch key 61, and the third touch key 61 is formed by the antenna.
  • the third touch key 61 is located between the first touch key 62 and the second touch key 63.
  • the first touch key 62, the second touch key 63, and the first The outer contour formed by combining the three touch keys 61 is circular.
  • the space occupied by the antenna is relatively concentrated. When the shape of the electronic device is circular, it helps to match the shape of the electronic device, and the design takes up less space.
  • the first touch key 62, the second touch key 63, and the third touch key 61 are sequentially arranged, and the first touch key 62 and the second touch key
  • the key 63 is rectangular
  • the third touch key 61 is serpentine.
  • the shape of the electronic device is rectangular, it helps to match the shape of the electronic device.
  • the electronic device in this embodiment may be, but is not limited to, an earphone, a watch, or a bracelet, so that the universality of the present application can be improved.
  • the antenna in the circuit is a Bluetooth antenna
  • the headset can be a Bluetooth headset
  • the watch can be a Bluetooth watch
  • the bracelet can be a Bluetooth bracelet.
  • this embodiment can make the space occupied by the antenna more concentrated, and can adapt to electronic devices of different shapes.
  • this embodiment is an example of a device corresponding to the first, second or third embodiment, and this embodiment can be implemented in cooperation with the first, second or third embodiment.
  • the related technical details mentioned in the first, second or third embodiments are still valid in this embodiment, and in order to reduce repetition, they are not repeated here.
  • the relevant technical details mentioned in this embodiment can also be applied in the first, second or third embodiment.

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Abstract

一种电路及电子设备，其中电路包括：天线（11）、触控芯片（12）以及通信芯片（13）；所述天线（11）形成检测电极，所述检测电极分别电连接于所述触控芯片（12）和所述通信芯片（13）；在手指触摸所述天线（11）时，所述天线（11）的电容量发生变化，所述触控芯片（12）检测到所述检测电极的传输数据发生变化，所述触控芯片（12）触发所述电子设备执行与触控操作相对应的指令。与现有技术相比，该电路及电子设备可以通过天线（11）实现天线和触控的两个功能，有效的将触控与天线的功能相融合，并且该电路所占用的体积较小，触控操作较为灵敏。

Description

一种电路及电子设备 技术领域
本申请实施例涉及触控领域，特别涉及一种电路及电子设备。
背景技术
近年来，随着通信技术的不断发展以及科技的不断进步，耳机、手表、手环等电子设备已成为人们日常生活中必不可少的使用工具。尤其是具有蓝牙天线的蓝牙耳机、蓝牙手表、蓝牙手环等电子设备，给人们的生活带来了极大的便利。目前诸如蓝牙耳机、蓝牙手表、蓝牙手环等电子设备体积小且使用便捷的无线连接方式与其他设备进行通讯，使其应用越来越广泛。
但是现有技术中至少存在如下问题：小型化和功能多样化存在矛盾，如蓝牙耳机有控制音量、切换歌曲等功能的需要，单个按键无法解决，可是多个按键却需要更大的空间，致使电子设备的体积变大。而功能的多样化还需要体积更大的电池来支撑，也会占用更大的空间，也会致使电子设备的体积变大。并且在空间有限情况下，如果天线所占得空间位置较大会导致触控面积减小，致使检测不灵敏。
发明内容
本申请实施方式的目的在于提供一种电路及电子设备，天线为检测电极，使得当用户手指触摸天线时可以通过触控芯片检测到天线的电容量发生变化，触发电子设备执行与触控操作相对应的指令。从而，通过天线实现天线和触控的两个功能，有效的将触控与天线的功能相融合，并且本申请设计的电路所占用的体积较小，触控操作较为灵敏。
为解决上述技术问题，本申请的实施方式提供了一种电路，所述电路应用于电子设备，所述电路包括：天线、触控芯片以及通信芯片；所述天线为检测电极，所述检测电极分别电连接于所述触控芯片和所述通信芯片；在手指触摸所述天线时，所述天线的电容量发生变化，所述触控芯片检测到所述电容量的变化，并触发所述电子设备执行与触控操作相对应的指令。
本申请的实施方式还提供了一种电子设备，包括至少一个触控键和上述电路；所述触控键之一由所述天线形成。
本申请实施方式相对于现有技术而言，所述天线由检测电极形成，检测电极分别电连接于触控芯片和通信芯片。在手指触摸天线时，天线的电容量发生变化，触控芯片检测到电容量的变化，触控芯片触发电子设备执行与触控操作相对应的指令。也就是说，当用户手指触摸天线时天线的电容量发生变化，由于将天线和触控芯片电连接，所以可以通过触控芯片检测到天线的电容量发生变化，触控芯片可以触发电子设备执行与触控操作相对应的指令。从而，可以通过天线同时实现天线和触控的两个功能，即天线实现通讯功能的同时还可以实现触控键的功能，有效的将触控与天线的功能相融合，并且本申请设计的电路所占用的体积较小，触控操作较为灵敏。
另外，所述天线的长度为所述天线工作频段信号波长的四分之一。将天线的长度设计为天线工作波长的四分之一可以使天线具有更好的辐射能力。
另外，所述电路还包括高通滤波电路；所述高通滤波电路电连接在所述检测电极和所述通信芯片之间。通过这种电路设计，可以将触控操作时的低频信号进行滤除，同时避免由于包括天线的射频电路的阻抗变化而导致在上述检测电容量的变化时产生较大的测量误差。
另外，所述高通滤波电路包括第三电容、第四电容和第一电感；所述第三电容和所述第四电容串联在所述检测电极和所述通信芯片之间，所述第一电感的其中一端连接在所述第三电容和所述第四电容之间，所述第一电感的另一端接***地。通过这种电路设计，提供了一种高通滤波电路的具体电路形式，并且在实际的设计中可以将高通滤波电路设计成集总参数电路也可以将高通滤波电路设计成微带滤波器电路。
另外，所述电路还包括低通滤波电路；所述低通滤波电路电连接在所述检测电极和所述触控芯片之间。通过这种电路设计，可以减少天线在发射高频信号时干扰触控操作，同时避免检测电极和触控芯片所组成的触控电路的寄生效应影响天线的接收性能。
另外，所述低通滤波电路包括第二电感、第三电感、第五电容；所述第二电感和所述第三电感串联在所述检测电极和所述触控芯片之间，所述第五电容的其中一端连接在所述第二电感和所述第三电感之间，所述第五电容的另一端接***地。通过这种电路设计，提供了一种低通滤波电路的具体电路形式，并且在实际的设计中可以将低通滤波电路设计成集总参数电路也可以将高通滤波电路设计成微带滤波器电路。
另外，所述电路还包括电池以及用于将所述电池和***地相隔离的隔离电路，所述隔离电路为集总参数电路或微带滤波器电路。由于隔离电路使电池的负极与***地相隔离，所以电池不会对天线的辐射产生屏蔽效应，从而可以使电池与天线之间的距离设置得比较近，减小电子设备的体积。
另外，所述隔离电路为集总参数电路，包括共模扼流圈；所述共模扼流圈包括第一共模 电感和第二共模电感；所述第一共模电感的其中一端接电池负极，另一端接***地；所述第二共模电感的其中一端接电池正极，另一端用于接预设电压。由于天线辐射的高频信号可以通过共模扼流圈与***地进行隔离，不会被***吸收，所以可以通过共模扼流圈提高天线的辐射性能。
另外，所述隔离电路为集总参数电路，包括：第一分离电感、第二分离电感和一个分离电容；所述第一分离电感、所述分离电容、所述分离第二电感依次串联在所述电池的正极、负极之间，所述第一分离电感和所述分离电容的连接端用于接预设电压，所述第二分离电感和所述分离电容的连接端接***地。通过这种电路设计可以避免电池影响天线的辐射性能。
另外，所述隔离电路为微带滤波器电路，包括：第一微带线、第二微带线和第七电容；所述第一微带线、所述第七电容、所述第二微带线依次串联在所述电池的正极、负极之间，所述第一微带线和所述第七电容的连接端接预设电压，所述第二微带线和所述第七电容的连接端接***地。通过这种电路设计可以提供另一种隔离电路的具体形式，有助于匹配用户设计过程中的不同设计需求。
另外，所述触控键包括第一触控键、第二触控键和第三触控键；所述第三触控键由所述天线形成，位于所述第一触控键和所述第二触控键之间。通过这种设计可以实现电子设备的功能多样化，并且不会占用较大的空间，可以有助于电子设备的小型化设计。
另外，所述第三触控按键位于所述第一触控键和所述第二触控键之间，所述第一触控键、所述第二触控键以及所述第三触控键组合形成的外轮廓形状为圆形。通过这种设计使得天线所占用的空间较为集中，当电子设备的形状为圆形时有助于匹配电子设备的形状，并且这种设计占用的空间较小。
另外，所述第一触控键、所述第二触控键以及所述第三触控键依次排列，所述第一触控键和所述第二触控键为矩形，所述第三触控键为蛇形。通过这种设计使得当电子设备的形状为长方形时，能够匹配电子设备的形状。
另外，所述电子设备为耳机、手表或手环，使得可以提高本申请的通用性。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定。
图1是根据本申请第一实施方式电路的结构框图；
图2是根据本申请第一实施方式天线的外形结构示意图；
图3是根据本申请第二实施方式电路的结构图；
图4是根据本申请第三实施方式辅助功能模块电路的结构图；
图5是根据本申请第三实施方式隔离电路的结构图；
图6是根据本申请第三实施方式隔离电路的另一结构图；
图7是根据本申请第五实施方式电子设备的电路结构简图；
图8是根据本申请第五实施方式电子设备的其中一种形态图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请的各实施方式进行详细的阐述。然而，本领域的普通技术人员可以理解，在本申请各实施方式中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本申请所要求保护的技术方案。
本申请的第一实施方式涉及一种电路，所述电路应用于电子设备。如图1所示，所述电路包括：天线11、触控芯片12以及通信芯片13。所述天线11为检测电极，所述检测电极分别电连接于所述触控芯片12和所述通信芯片13。在手指触摸所述检测电极时，所述检测电极的电容量发生变化，所述触控芯片12检测所述电容量的变化，并触发所述电子设备执行与触控操作相对应的指令。
本申请天线11由检测电极形成，检测电极分别电连接于触控芯片12和通信芯片13。在手指触摸检测电极时，检测电极的电容量发生变化，触控芯片12检测到电容量的变化，并触发电子设备执行与触控操作相对应的指令。也就是说，当用户手指触摸天线11时天线11的电容量发生变化，由于将天线11和触控芯片12电连接，所以可以通过触控芯片12检测到天线11的电容量发生变化，触控芯片12可以触发电子设备执行与触控操作相对应的指令。值得说明的是，本申请实施例的天线11可以同时执行通信功能和触控功能。通过天线11同时实现天线11和触控的两个功能，有效的将触控与天线11的功能相融合，并且本申请设计的电路所占用的体积较小，触控操作较为灵敏。
在实际的应用中，触控芯片12内设有用于对所述检测电极的电容量进行检测的积分电路14和处理单元121。其中，所述检测电极电连接于所述积分电路14的输入端，所述积分电路14的输出端电连接于处理单元121。在手指触摸所述检测电极时，所述检测电极的电容量发生变化，处理单元121检测到所述积分电路14输出端的电压发生变化，触发所述电子设备执行与触控操作相对应的指令，从而实现触控功能，提供了一种检测手指触摸的具体实现形式， 有助于提升本申请的可行性。
举例而言，在手指触摸检测电极之前，检测电极和***地之间形成寄生电容C KG，也就是天线11和***地之间形成寄生电容C KG。此时，检测电极的电容量为C KG。在手指触摸检测电极之后，手指和检测电极之间形成第一电容C FK，也就是手指和天线11之间形成第一电容C FK，手指和***地之间形成第二电容C FG。此时，检测电极的电容量为C KG、C FK以及C FG的总电容。由于C FK和C FG串联之后与C KG并联。所以，电容量的改变量ΔC为C FK和C FG的总电容。
ΔC＝C FK*C FG/(C FK+C FG)。
而电量的变化量为ΔQ＝ΔC*U K。其中，U K为电路***10对检测电极注入的预设打码电压。
当电量改变时，积分电路14的输出端的电压会发生变化，此时，处理单元121可以识别到积分电路14输出端的电压发生变化，从而可以确定有手指触摸天线11。
如图2所示，所述天线11的长度为所述天线11工作频段信号波长的四分之一。将天线11的长度设计为天线11工作频段信号波长的四分之一可以使天线11具有更好的辐射能力。本实施方式的天线11可以设计为蛇形结构。值得一提的是，天线11不限于为蛇形结构，只要是能保证天线11的长度为天线11工作频段信号波长的四分之一的任意形状都在本申请的保护范围之内。以天线11为蓝牙天线为例进行说明，蓝牙频段为2.4GHz，将天线11的长度设计为该频段信号波长的四分之一具有很好的辐射能力。但是本申请的天线11不限于为蓝牙天线，比如可以根据实际的设计需求将天线11设计为Zigbee天线(Zigbee是基于IEEE802.15.4标准的低功耗局域网协议)或WiFi天线(WiFi是一种允许电子设备连接到一个无线局域网的技术)等形式，在此不再举例。
另外，所述电路还包括高通滤波电路15。所述高通滤波电路15电连接在所述天线11和所述通信芯片13之间。通过这种电路设计，可以将低频信号进行滤除(比如将U K进行滤除)，同时避免由于射频电路(包括天线11等部件)的阻抗变化而导致上述检测电容量的变化时产生较大的测量误差。值得指出的是高通滤波电路15的具体形式可以是集总参数电路也可以是微带滤波器电路。
所述电路还包括低通滤波电路16。所述低通滤波电路16电连接在所述检测电极和所述触控芯片12之间。通过这种电路设计可以减小高频信号对触摸检测的干扰，此处的高频信号为蓝牙信号在发射时注入的高频信号，同时可以避免触控电路的寄生效应影响天线11的接收性能，能够很好地让天线11独立工作。值得指出的是低通滤波电路16的具体形式可以是集 总参数电路也可以是微带滤波器电路。
所述电路同时包括上述高通滤波电路15和低通滤波电路16时，执行通信功能的支路和执行触摸功能的支路之间不会相互影响，因此，通过天线11可以同时执行通信和触控两个功能。
与现有技术相比，本实施方式使得当用户手指触摸天线11时可以通过触控芯片12检测到天线11的电容量发生变化，触发电子设备执行与触控操作相对应的指令。从而，可以通过天线11同时实现天线11和触控的两个功能，有效的将触控与天线11的功能相融合，并且本申请设计的电路所占用的体积较小，触控操作较为灵敏。
本申请的第二实施方式涉及一种电路，该电路应用于电子设备。本实施方式是在第一实施方式的基础上做了进一步改进，主要改进之处在于：本实施方式提供了一种高通滤波电路、低通滤波电路以及积分电路的具体形式。
如图3所示，所述电路还包括高通滤波电路15。所述高通滤波电路15电连接在所述检测电极和所述通信芯片13之间。通过这种电路设计，可以将低频信号进行滤除(比如将U K进行滤除)，同时避免由于射频电路的阻抗变化而导致上述检测电容量的变化时产生较大的测量误差。具体的，所述高通滤波电路包括两个电容和一个电感，分别是：第三电容C1、第四电容C2、第一电感L1。两个电容串联在所述检测电极和所述通信芯片13之间，所述第一电感L1的其中一端连接在两个电容之间，另一端接***地。即第三电容C1和第四电容C2串联在所述检测电极和所述通信芯片13之间，第一电感L1的其中一端连接在两个电容之间的连接端，第一电感L1的另一端接***地。通过这种电路设计，提供了一种高通滤波电路的具体电路形式，并且在实际的设计中可以将高通滤波电路设计成集总参数电路也可以将高通滤波电路设计成微带滤波器电路。
所述电路还包括低通滤波电路16。所述低通滤波电路16电连接在所述检测电极和所述触控芯片12之间。通过这种电路设计可以减小高频信号对触摸检测的干扰，此处的高频信号为蓝牙信号在发射时注入的高频信号，同时可以避免触控电路的寄生效应影响天线11的接收性能，能够很好地让天线11独立工作。值得指出的是低通滤波电路16的具体形式可以是集总参数电路也可以是微带滤波器电路。具体的，所述低通滤波电路包括两个电感和一个电容，分别是：第二电感L2、第三电感L3、第五电容C3。两个电感串联在所述检测电极和所述触控芯片12之间，第五电容C3的其中一端连接在两个电感之间，另一端接***地。即第二电感L2和第三电感L3串联在所述检测电极和所述触控芯片12之间，第五电容C3的其中一端连接在所述两个电感之间的连接端，第五电容C3的另一端接***地。通过这种电路设计， 提供了一种低通滤波电路的具体电路形式，并且在实际的设计中可以将低通滤波电路设计成集总参数电路也可以将高通滤波电路设计成微带滤波器电路。此外，需要说明的是，第五电容C3的电容值不能过大，如果第五电容C3的电容值过大超过触控芯片12的负载能力，导致触控芯片12无法实现触控功能。
与现有技术相比，本实施方式同时包括上述高通滤波电路15和低通滤波电路16，高通滤波电路15可以将低频信号进行滤除，同时避免由于射频电路的阻抗变化而导致上述检测电容量的变化时产生较大的测量误差。并且低通滤波电路16可以减小高频信号对触摸检测的干扰，同时可以避免触控电路的寄生效应影响天线11的接收性能，能够很好地让天线11独立工作。执行通信功能的支路和执行触摸功能的支路之间不会相互影响，因此，通过天线11可以同时执行通信和触控两个功能。
本申请的第三实施方式涉及一种电路，该电路应用于电子设备。本实施方式是在第一实施方式的基础上做了进一步改进，主要改进之处在于：电路还包括电池以及用于将电池和***地相隔离的隔离电路。其中，所述隔离电路可以为集总参数电路或微带滤波器电路。以下对隔离电路的具体形式作简要说明：
如图4所示，所述隔离电路为集总参数电路，包括共模扼流圈18。所述共模扼流圈18包括第一共模电感和第二共模电感。所述第一共模电感的其中一端接电池负极，另一端接***地GND。所述第二共模电感的其中一端接电池正极，另一端接预设电压V BAT。由于天线11辐射的高频信号可以通过共模扼流圈与***地进行隔离，不会被***吸收，所以可以通过共模扼流圈实现将天线上的高频信号与***之间进行隔离。具体而言，由于共模扼流圈18的共模抑制比非常大，天线11辐射的高频信号不会通过共模扼流圈18和电池的负极耦合到***地上，不会使天线11辐射的高频信号被电路***吸收，而是让高频信号的能量辐射出去。所以可以通过共模扼流圈18提高天线11的辐射性能。
如图5所示，所述隔离电路为集总参数电路，包括：第一分离电感L_Battery、第二分离电感L_GND和一个分离电容C_filter。所述第一分离电感L_Battery、所述分离电容C_filter、所述第二分离电感L_GND依次串联在所述电池的正极、负极之间，所述第一分离电感L_Battery和所述分离电容C_filter的连接端接预设电压V-Battery，所述第二分离电感L_GND和所述分离电容C_filter的连接端接***地。通过这种电路设计可以避免电池影响天线的辐射性能。
如图6所示，所述隔离电路为微带滤波器电路，包括：第一微带线W1、第二微带线W2和第七电容C7。所述第一微带线W1、所述第七电容C7、所述第二微带线W2依次串联在所述电池的正极、负极之间。所述第一微带线W1和所述第七电容C7的连接端接预设电压V BAT，所述第二微带线W2和所述第七电容C7的连接端接***地GND。其中，所述第一微带线W1和所述第二微带线W2均为蛇形结构，长度相同。
具体地说，当隔离电路采用微带滤波器组成时，隔离电路的等效输入阻抗为Z in。
Figure PCTCN2018108447-appb-000001
其中Z 0、Z L分别为第一微带线W1和第二微带线W2的阻抗。
Figure PCTCN2018108447-appb-000002
微带线中的信号波长
Figure PCTCN2018108447-appb-000003
当天线的长度d设计为工作频段信号波长的四分之一即d＝λ/4时，tan(βd)＝∞。此时等效输入阻抗的公式化简为：
Figure PCTCN2018108447-appb-000004
由于C KG很大，在射频电路阻抗相当于Z L＝0，这样Zin＝∞，故可以通过上述电路设计将电池和***地相隔离。
与现有技术相比，本实施方式由于隔离电路使电池的负极与***地相隔离，所以电池不会对天线的辐射产生屏蔽效应，从而可以使电池与天线之间的距离设置得比较近，减小电子设备的体积。
本申请的第四实施方式涉及一种电子设备。该电子设备包括至少一个触控键和第一、第二或第三实施方式的电路，所述触控键之一由所述天线形成。
值得一提的是，本实施方式的电子设备可以但不限于为耳机、手表或手环，使得可以提高本申请的通用性。如果电路中的天线为蓝牙天线则耳机可以为蓝牙耳机，手表可以为蓝牙手表，手环可以为蓝牙手环。
与现有技术相比，本实施方式的电子设备可以通过天线同时实现天线和触控的两个功能。
不难发现，本实施方式为与第一、第二或第三实施方式相对应的设备实施例，本实施方式可与第一、第二或第三实施方式互相配合实施。第一、第二或第三实施方式中提到的相关技术细节在本实施方式中依然有效，为了减少重复，这里不再赘述。相应地，本实施方式中提到的相关技术细节也可应用在第一、第二或第三实施方式中。
本申请的第五实施方式涉及一种电子设备。本实施方式是在第四实施方式的基础上做了进一步改进，主要改进之处在于：本实施方式除包括第四实施方式由所述天线形成的触控键外，还包括其他的触控键。
如图7，电子设备的触控键包括第一触控键62和第二触控键63以及第三触控键61，所述第三触控键61由上述天线形成。通过这种设计可以实现电子设备的功能多样化，并且不会占用较大的空间，可以有助于电子设备的小型化设计。所述第三触控按键61位于所述第一触控键62和所述第二触控键63之间，所述第一触控键62、所述第二触控键63以及所述第三触控键61组合形成的外轮廓为圆形。通过这种设计使得天线所占用的空间较为集中，当电子设备的形状为圆形时有助于匹配电子设备的形状，并且这种设计占用的空间较小。如图8所示，所述第一触控键62、所述第二触控键63以及所述第三触控键61依次排列，所述第一触控键62和所述第二触控键63为矩形，所述第三触控键61为蛇形，当电子设备的形状为长方形时有助于匹配电子设备的形状。
值得一提的是，本实施方式的电子设备可以但不限于为耳机、手表或手环，使得可以提高本申请的通用性。如果电路中的天线为蓝牙天线则耳机可以为蓝牙耳机，手表可以为蓝牙手表，手环可以为蓝牙手环。
与现有技术相比，本实施方式可以使天线所占用的空间较为集中，并且可以适配不同外形的电子设备。
不难发现，本实施方式为与第一、第二或第三实施方式相对应的设备实施例，本实施方式可与第一、第二或第三实施方式互相配合实施。第一、第二或第三实施方式中提到的相关技术细节在本实施方式中依然有效，为了减少重复，这里不再赘述。相应地，本实施方式中提到的相关技术细节也可应用在第一、第二或第三实施方式中。
本领域的普通技术人员可以理解，上述各实施方式是实现本申请的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。

Claims (16)

  1. 一种电路，其特征在于，所述电路应用于电子设备，所述电路包括：
    天线、触控芯片以及通信芯片；
    所述天线为检测电极，所述检测电极分别电连接于所述触控芯片和所述通信芯片；
    在手指触摸所述检测电极时，所述检测电极的电容量发生变化，所述触控芯片检测所述电容量的变化，并触发所述电子设备执行与触控操作相对应的指令。
  2. 根据权利要求1所述的电路，其特征在于，所述天线的长度为所述天线工作频段信号波长的四分之一。
  3. 根据权利要求1所述的电路，其特征在于，所述电路还包括高通滤波电路；
    所述高通滤波电路电连接在所述检测电极和所述通信芯片之间。
  4. 根据权利要求3所述的电路，其特征在于，所述高通滤波电路包括第三电容、第四电容和第一电感；
    所述第三电容和所述第四电容串联在所述检测电极和所述通信芯片之间，所述第一电感的其中一端连接在所述第三电容和所述第四电容之间，所述第一电感的另一端接***地。
  5. 根据权利要求1所述的电路，其特征在于，所述电路还包括低通滤波电路；
    所述低通滤波电路电连接在所述检测电极和所述触控芯片之间。
  6. 根据权利要求5所述的电路，其特征在于，所述低通滤波电路包括第二电感、第三电感、第五电容；
    所述第二电感和所述第三电感串联在所述检测电极和所述触控芯片之间，所述第五电容的其中一端连接在所述第二电感和所述第三电感之间，所述第五电容的另一端接***地。
  7. 根据权利要求1-6任一项所述的电路，其特征在于，所述电路还包括电池以及用于将所述电池和***地相隔离的隔离电路，所述隔离电路为集总参数电路或微带滤波器电路。
  8. 根据权利要求7所述的电路，其特征在于，所述隔离电路为集总参数电路，包括共模扼流圈；
    所述共模扼流圈包括第一共模电感和第二共模电感；
    所述第一共模电感的其中一端接电池负极，另一端接***地；
    所述第二共模电感的其中一端接电池正极，另一端接预设电压。
  9. 根据权利要求7所述的电路，其特征在于，所述隔离电路为集总参数电路，包括：第一分离电感、第二分离电感和一个分离电容；
    所述第一分离电感、所述分离电容、所述第二分离电感依次串联在所述电池的正极、负 极之间，所述第一分离电感和所述分离电容的连接端接预设电压，所述第二分离电感和所述分离电容的连接端接***地。
  10. 根据权利要求7所述的电路，其特征在于，所述隔离电路为微带滤波器电路，包括：第一微带线、第二微带线和第七电容；
    所述第一微带线、所述第七电容、所述第二微带线依次串联在所述电池的正极、负极之间，所述第一微带线和所述第七电容的连接端接预设电压，所述第二微带线和所述第七电容的连接端接***地。
  11. 根据权利要求10所述的电路，其特征在于，所述第一微带线和所述第二微带线均为蛇形结构，长度相同。
  12. 一种电子设备，其特征在于，包括至少一个触控键和如权利要求1-11中任一项所述的电路；
    所述触控键之一由所述天线形成。
  13. 根据权利要求12所述的电子设备，其特征在于，所述触控键包括第一触控键、第二触控键和第三触控键；所述第三触控键由所述天线形成。
  14. 根据权利要求13所述的电子设备，其特征在于，所述第三触控按键位于所述第一触控键和所述第二触控键之间，所述第一触控键、所述第二触控键以及所述第三触控键组合形成的外轮廓形状为圆形。
  15. 根据权利要求13所述的电子设备，其特征在于，所述第一触控键、所述第二触控键以及所述第三触控键依次排列，所述第一触控键和所述第二触控键为矩形，所述第三触控键为蛇形。
  16. 根据权利要求12所述的电子设备，其特征在于，所述电子设备为耳机、手表或手环。
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