WO2019029563A1 - 开关机静音控制电路、控制方法及音频设备 - Google Patents

开关机静音控制电路、控制方法及音频设备 Download PDF

Info

Publication number
WO2019029563A1
WO2019029563A1 PCT/CN2018/099372 CN2018099372W WO2019029563A1 WO 2019029563 A1 WO2019029563 A1 WO 2019029563A1 CN 2018099372 W CN2018099372 W CN 2018099372W WO 2019029563 A1 WO2019029563 A1 WO 2019029563A1
Authority
WO
WIPO (PCT)
Prior art keywords
transistor
resistor
switch module
switch
mute
Prior art date
Application number
PCT/CN2018/099372
Other languages
English (en)
French (fr)
Inventor
孙良财
Original Assignee
捷开通讯(深圳)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 捷开通讯(深圳)有限公司 filed Critical 捷开通讯(深圳)有限公司
Priority to EP18844308.9A priority Critical patent/EP3668111B1/en
Priority to US16/637,762 priority patent/US10826455B2/en
Publication of WO2019029563A1 publication Critical patent/WO2019029563A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/007—Protection circuits for transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups

Definitions

  • the present invention relates to the field of audio devices, and in particular, to a switch mute control circuit, a control method, and an audio device.
  • pop sound blasting sound
  • the discharge process of coupling capacitor is also prone to pop. Sound, if this pop sound is not controlled, it may cause damage to the device during power-on or power-down of the system.
  • the presence of pop sound also has a great impact on the product experience.
  • a good audio product is only normal. The sound is output only when the system is out of sound, and should be muted during power-on and power-down.
  • Audio products generally have a software control system. In the normal operation of the system, there is an MCU.
  • the software can control the level of the enable pin through the IO port, but the IO port is uncontrollable during power-on and system power-down. Therefore, it is necessary to implement the high and low levels of the enable pin through hardware to control the generation of pop sound.
  • the embodiment of the invention provides a mute control circuit, a control method and an audio device for a switch, and a low-cost simple control circuit can output a high level to a mute circuit during power-on and power-down, thereby controlling the operation of the mute circuit, thereby Eliminate pop sound when switching on and off, and improve the product experience of audio equipment.
  • an embodiment of the present invention provides a switch mute control circuit, where the switch mute control circuit is connected to a power supply end of the audio device and a mute circuit, wherein the switch mute control circuit includes a charge and discharge module, a first switch module and a second switch module; the power supply end charges the charge and discharge module when the power is turned on, and the charge and discharge module discharges to the power supply end when the power is turned off, the charge and discharge module is charging or Outputting a first level to the first switch module during discharge, controlling the first switch module to be in an on state, and outputting a second level to the second switch module by the first switch module, the control station The second switch module is in an on state, and the second switch module outputs a high level to the mute circuit to control the mute circuit to start working.
  • the charge and discharge module includes a charge and discharge unit and an isolation unit, and the isolation unit controls the direction of the charging current and the direction of the discharge current when the power is turned on and the power is turned off.
  • the charge and discharge unit charges or discharges according to the charging current direction and the discharge current direction.
  • the charge and discharge unit includes a first capacitor and a second capacitor
  • the isolation unit includes a first diode, a second diode, and a first resistor
  • a cathode of the first diode is connected to a cathode of the second diode, one end of the first resistor, and the power supply end, and a cathode of the first diode is connected to the first switch module and
  • the second switch module is also grounded through the second capacitor
  • the anode of the second diode is connected to the other end of the first resistor and the first switch module, and is also grounded through the first capacitor.
  • the first switch module includes a second resistor, a third resistor, and a first transistor; one end of the second resistor is connected to the second diode a positive pole, the other end of the second resistor is connected to a base of the first transistor; an emitter of the first transistor is connected to one end of the third resistor, and the other end of the third resistor A cathode of the first diode is connected, and a collector of the first transistor is connected to the second switch module.
  • the second switch module includes a fourth resistor, a fifth resistor, and a second transistor; one end of the fourth resistor is connected to the first transistor a collector, the other end of the fourth resistor is connected to a base of the second transistor; a collector of the second transistor is connected to a cathode of the first diode, the second three
  • the emitter of the pole tube is connected to one end of the fifth resistor and the mute circuit; the other end of the fifth resistor is grounded.
  • the first triode is a PNP type triode.
  • the second triode is an NPN type triode.
  • an embodiment of the present invention further provides a method for controlling a mute of a switch, which includes the following steps:
  • the charging and discharging module outputs a first level to the first switching module during the charging or discharging process, and controls the first switching module to be in an on state;
  • the second switch module outputs a high level to the mute circuit to control the mute circuit to start working.
  • an embodiment of the present invention further provides an audio device, including a power supply end, a mute circuit, and a switch mute control circuit, where the switch mute control circuit is connected to the power supply end and the mute circuit;
  • the switch mute control circuit includes a charge and discharge module, a first switch module and a second switch module; when the power is turned on, the power supply end charges the charge and discharge module, and when the power is turned off, the charge and discharge module is Discharging at the power supply end, the charge and discharge module outputs a first level to the first switch module during charging or discharging, controlling the first switch module to be in an on state, and outputting a second by the first switch module Leveling to the second switch module, controlling the second switch module to be in an on state, and outputting a high level to the mute circuit by the second switch module to control the mute circuit to start working;
  • the first level is a low level and the second level is a high level.
  • the charging and discharging module includes a charging and discharging unit and an isolation unit, and the charging unit controls a charging current direction and a discharging current direction when the power is turned on and off when the power is turned off.
  • the discharge cell charges or discharges according to the charging current direction and the discharge current direction.
  • the charge and discharge unit includes a first capacitor and a second capacitor
  • the isolation unit includes a first diode, a second diode, and a first resistor
  • a cathode of the diode is connected to a cathode of the second diode, one end of the first resistor, and the power supply end, and a cathode of the first diode is connected to the first switch module and the second
  • the switch module is also grounded through the second capacitor
  • the anode of the second diode is connected to the other end of the first resistor and the first switch module, and is also grounded through the first capacitor.
  • the power supply terminal when the power supply terminal is powered on, the power supply terminal charges the first capacitor through the first resistor, and passes through the first diode
  • the second capacitor is charged, and a low level is outputted to the first switch module during charging of the first capacitor; when the power supply end is powered off, due to the isolation function of the first diode, Discharging the discharge path of the second capacitor to the power supply terminal such that charge in the second capacitor is discharged through the first switch module, and charge in the first capacitor passes through the second
  • the diode is released such that the level signal output to the first switching module is at a low level, thereby controlling the first capacitor and the second capacitor to be charged and discharged according to a preset route.
  • the first switch module includes a second resistor, a third resistor, and a first transistor; one end of the second resistor is coupled to the anode of the second diode, The other end of the second resistor is connected to the base of the first transistor; the emitter of the first transistor is connected to one end of the third resistor, and the other end of the third resistor is connected to the a cathode of the first diode, the collector of the first transistor being connected to the second switch module.
  • the second switch module includes a fourth resistor, a fifth resistor, and a second transistor; one end of the fourth resistor is connected to the collector of the first transistor The other end of the fourth resistor is connected to the base of the second transistor; the collector of the second transistor is connected to the cathode of the first diode, and the second transistor The emitter is connected to one end of the fifth resistor and the mute circuit; the other end of the fifth resistor is grounded.
  • the first triode is a PNP type triode.
  • the second triode is an NPN type triode.
  • the level signal input to the base of the first transistor is a low level, and the power supply voltage of the power supply terminal passes through The first diode and the third resistor reach the emitter of the first transistor, when the voltage difference between the emitter voltage and the base voltage of the first transistor is greater than 0.7V
  • the first triode remains in an on state and the collector voltage and the emitter voltage of the first triode connected to the base of the second triode are both at a high level, such that the first a switch module outputs a high level to the second switch module; and since the emitter of the second transistor is grounded, the second transistor is controlled to be in an on state and the second transistor is The emitter voltage and the collector voltage are both at a high level, so that the output of the switch mute control circuit outputs a high level to the mute circuit to control the mute circuit to start working.
  • the first transistor is in an off state due to an increase in a base voltage of the first transistor, the first The collector of the triode outputs a low level to the second triode, such that the second triode is in an off state, thereby controlling the output of the switch mute control circuit to output a low level to the Silent circuit.
  • the second capacitor when the power supply terminal is powered off, the second capacitor can only pass through the third resistor and the first a triode is discharged, and the first capacitor immediately discharges the charge completely through the second diode, such that the base of the first triode is extremely low, and due to the first three poles
  • the emitter of the tube is at a high level under the discharge of the second capacitor, and the first triode is controlled to be in an on state, and the collector voltage of the first transistor is at a high level, so that The second transistor is in an on state, and the emitter voltage and the collector voltage of the second transistor are both at a high level, so that the output of the switch mute control circuit outputs a high level to The mute circuit controls the mute circuit to start working.
  • the first transistor is in an off state due to a drop in an emitter voltage of the first transistor, the first The collector of the triode outputs a low level to the second triode, such that the second triode is in an off state, thereby controlling the output of the switch mute control circuit to output a low level to the Silent circuit.
  • the invention discloses a switch mute control circuit, a control method and an audio device, wherein the switch mute control circuit is connected with a power supply end of the audio device and a mute circuit, and the switch mute control circuit comprises a charge and discharge module, The first switch module and the second switch module; the power supply end charges the charge and discharge module when the power is turned on, and the charge and discharge module discharges to the power supply end when the power is turned off, and the charge and discharge module outputs the first level to the first during the charging or discharging process.
  • a switch module controls the first switch module to be in an on state, the first switch module outputs a second level to the second switch module, controls the second switch module to be in an on state, and the second switch module outputs a high level to
  • the mute circuit controls the mute circuit to start working.
  • the low-cost simple control circuit can output a high level to the mute circuit during power-on and power-down, and control the mute circuit to eliminate the pop sound when the machine is turned on and off, and improve the product experience of the audio device.
  • FIG. 1 is a structural block diagram of a mute control circuit of a switch machine according to an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a mute control circuit of a switch machine according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of voltage analog output during power-on in an application example of a switch mute control circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of voltage analog output when power is turned off in an application example of a switch mute control circuit according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for controlling mute of a switch according to an embodiment of the present invention.
  • the object of the present invention is to provide a mute control circuit, a control method and an audio device for the switch, which can be implemented by using a low-cost simple control circuit.
  • the high level is output to the mute circuit to control the mute circuit to eliminate the pop sound when the machine is turned on and off, and improve the product experience of the audio device.
  • the switch mute control circuit 100 of the present invention is connected to the power supply end of the audio device and the mute circuit 200 , wherein the power supply end can be a VCC power supply end, and the switch mute control circuit 100 includes charging and discharging.
  • the module 10, the first switch module 11 and the second switch module 12, the charge and discharge module 10, the first switch module 11 and the second switch module 12 are all connected to the VCC power supply end of the audio device, and the charge and discharge module 10,
  • the first switch module 11 and the second switch module 12 are sequentially connected, and the second switch module 12 is further connected to the mute circuit 200, and the level signal output by the second switch module 12 controls the working state of the mute circuit 200, thereby opening Or turn off the mute circuit 200.
  • the VCC power supply terminal supplies a DC power supply voltage to the switch mute control circuit 100, and the charge and discharge module 10 is charged, and when the audio device is powered off, the charge and discharge module 10 stores The power will be released.
  • the charging and discharging module 10 is discharged, and the charging and discharging module 10 outputs the first level to the first switching module 11 during the startup charging or the shutdown discharging, and controls the first switching module 11 to be in a conducting state, and then
  • the first switch module 11 outputs the second level to the second switch module 12, and controls the second switch module 12 to be in an on state, so that the second switch module 12 outputs a high level to the mute circuit 200, and controls the mute circuit 200 to start working. Therefore, the pop sound generated during the startup and shutdown process is eliminated, and the problem that the controller IO port is uncontrollable due to uncontrollable power-on and power-down process is solved, thereby improving the product experience.
  • the first level is a low level
  • the second level is a high level.
  • the first level can be adjusted according to actual needs, and only the second switch module 12 needs to be controlled to output high power.
  • the mute circuit 200 is normally operated to make it work normally, which is not limited by the present invention.
  • the charging and discharging module 10 includes a charging and discharging unit 101 and an isolation unit 102.
  • the isolation unit 102 is connected to the charging and discharging unit 101, and the charging and discharging unit 101 is connected to the first switching module. 11.
  • the charging unit 102 controls the charging current direction and the discharging current direction when the power is turned on and off when the power is turned off, and the charging and discharging unit 101 performs charging or discharging according to the charging current direction and the discharging current direction, that is, the present invention is set by
  • the isolation unit 102 controls the current direction during charging and discharging to ensure that the charging and discharging unit 101 performs charging or discharging according to a preset direction, thereby ensuring the accuracy of the level signal outputted to the first switching module 11, thereby ensuring that the silent circuit 200 can It works normally when it is turned on and off, and eliminates the pop sound during the process of switching on and off, improving the reliability of the product.
  • the charging and discharging unit 101 includes a first capacitor C1 and a second capacitor C2, and the isolation unit 102 includes a first diode D1, a second diode D2, and a first resistor R1;
  • the anode of the diode D1 is connected to the cathode of the second diode D2, one end of the first resistor R1, and the VCC power supply terminal, and the cathode of the first diode D1 is connected to the first switch module 11, the second switch module 12, and
  • the second capacitor C2 is grounded; the anode of the second diode D2 is connected to the other end of the first resistor R1 and the first switch module 11, and is also grounded through the first capacitor C1.
  • the VCC power supply terminal When the VCC power supply terminal is powered on, the first capacitor C1 is charged through the first resistor R1, and the second capacitor C2 is charged through the first diode D1, and the low level is outputted to the first switch module during the charging process of the first capacitor C1. 11;
  • the discharge path of the second capacitor C2 to the VCC power supply terminal is isolated due to the isolation of the first diode D1, so the charge in the second capacitor C2 passes through the first switch module 11 The discharge is performed, and the charge in the first capacitor C1 is quickly released through the second diode D2, so that the level signal outputted to the first switch module 11 is at a low level, thereby controlling the first capacitor C1 and the second capacitor C2.
  • the level signal outputted to the first switch module 11 is a low level signal when the power is turned on or off, and the conduction is controlled, thereby controlling the subsequent signal output.
  • the mute circuit 200 can start the work in time, eliminate the pop sound during the process of turning on and off, and ensure the mute effect when the audio device is turned on and off.
  • the first switch module 11 includes a second resistor R2, a third resistor R3, and a first transistor Q1; one end of the second resistor R2 is connected to the anode of the second diode D2, and the second The other end of the resistor R2 is connected to the base of the first transistor Q1; the emitter of the first transistor Q1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the first diode.
  • a cathode of D1, a collector of the first transistor Q1 is connected to the second switch module 12.
  • the first transistor Q1 is a PNP type transistor.
  • the second switch module 12 includes a fourth resistor R4, a fifth resistor R5, and a second transistor Q2; one end of the fourth resistor R4 is connected to the collector of the first transistor Q1, and the fourth resistor R4 The other end of the second transistor Q2 is connected to the base of the second transistor Q2; the collector of the second transistor Q2 is connected to the cathode of the first diode D1, and the emitter of the second transistor Q2 is connected to the fifth resistor.
  • One end of R5 and the mute circuit 200; the other end of the fifth resistor R5 is grounded.
  • the second transistor Q2 is an NPN type triode.
  • the second resistor R2 is input to the second resistor R2.
  • the level signal of the base of the first transistor Q1 is low.
  • the level signal input to the base of the first transistor Q1 is a low level, and the power supply voltage of the VCC power supply terminal passes through the first diode D1 and the third resistor R3 to reach the first three poles.
  • the emitter of the tube Q1 when the voltage difference between the emitter voltage and the base voltage is greater than 0.7V, the first transistor Q1 is kept in an on state, and the first connection with the base of the second transistor Q2 is at this time.
  • the collector voltage of the transistor Q1 is equal to the emitter voltage, and both are high level, that is, the first switch module 11 outputs a high level to the second switch module 12; since the emitter of the second transistor Q2 is pulled down to the ground Therefore, the second transistor Q2 will be in the on state, the emitter voltage of the second transistor Q2 is equal to the collector voltage, and both are high level, that is, the output terminal Out_put of the switch mute control circuit 100 will output. Go high to the mute circuit 200 and control it to start working. After the first capacitor C1 is charged, the first transistor Q1 is turned off due to the rise of the base voltage, and the collector outputs a low level to the second transistor Q2, so that the second transistor Q2 is also turned off. The control output terminal Out_put outputs a low level to the mute circuit 200.
  • the voltage analog output diagram at the time of power-on is as shown in FIG. 3, wherein the No. 1 is the VCC voltage, and the No. 2 is the output terminal Out_put voltage, and the switch mute control circuit 100 can be seen.
  • the output terminal Out_put signal changes to a high level at the moment of power-on, and remains high for a period of time, then goes low, and eliminates the pop sound through the mute circuit 200 during the high-level period, and the mute is turned on. effect.
  • the capacitance value and the resistance value of the first capacitor C1 and the first resistor R1 determine the high-level duration, and can be adjusted according to actual needs to meet different applications.
  • the second capacitor C2 can only be discharged through the third resistor R3 and the first transistor Q1 due to the isolation of the first diode D1.
  • the first capacitor C1 passes immediately.
  • the second diode D2 completely discharges the charge, so that the base of the first transistor Q1 is at a low level, and since the emitter of the first transistor Q1 is at a high level under the discharge of the second capacitor C2, Therefore, the first transistor Q1 is turned on, and its collector is at the same high level, so that the second transistor Q2 is also in an on state, and the emitter voltage of the second transistor Q2 is equal to the collector voltage.
  • the output terminal Out_put of the switch mute control circuit 100 will output a high level to the mute circuit 200 to control its operation.
  • the first transistor Q1 When the discharge of the second capacitor C2 is completed, the first transistor Q1 will be in an off state due to the drop of the emitter voltage, and the collector outputs a low level to the second transistor Q2, so that the second transistor Q2 is also turned off.
  • the control output terminal Out_put outputs a low level to the mute circuit 200.
  • the voltage analog output diagram at the time of power failure is as shown in FIG. 4, wherein the No. 1 is the VCC voltage, and the No. 2 is the output terminal Out_put voltage, and the switch mute control circuit 100 can be seen.
  • the output terminal Out_put signal changes to a high level at the moment of power failure, and is maintained at a high level for a period of time, and then goes to a low level, and the pop sound is eliminated by the mute circuit 200 during the period when the high level continues, thereby improving the mute shutdown. effect.
  • the capacitance value and the resistance value of the second capacitor C2 and the first resistor R1 determine the high-level duration, and can be adjusted according to actual needs to meet different applications.
  • the present invention further provides a switch mute control method.
  • the switch mute control method includes the following steps:
  • the charging and discharging module outputs a first level to the first switch module during the startup charging or the shutdown discharging, and controls the first switching module to be in an on state;
  • the second switch module outputs a second level to the second switch module, and controls the second switch module to be in an on state;
  • the second switch module outputs a high level to the mute circuit, and the mute circuit is controlled to start working.
  • the present invention further provides an audio device including a power supply terminal, a mute circuit, and a switch mute control circuit as described above, since the switch mute control circuit has been performed above. Detailed description is not described in detail here.
  • the switch mute control circuit is connected with the power supply end of the audio device and the mute circuit, and the switch mute control circuit includes charging and discharging.
  • the mute circuit is controlled to the mute circuit.
  • the low-cost simple control circuit can output a high level to the mute circuit during power-on and power-down, and control the mute circuit to eliminate the pop sound when the machine is turned on and off, and improve the product experience of the audio device.

Abstract

一种开关机静音控制电路，包括充放电模块、第一开关模块和第二开关模块；上电或掉电时充放电模块与供电端间进行充电或放电，充放电模块在充电或放电时输出第一电平至第一开关模块并控制其导通及输出第二电平至第二开关模块，控制第二开关模块导通及输出高电平至静音电路以使静音电路工作。本发明还提供控制方法及音频设备。

Description

开关机静音控制电路、控制方法及音频设备
本申请要求于2017年08月10日提交中国专利局、申请号为201710679849.X、发明名称为“一种开关机静音控制电路、控制方法及音频设备”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
本发明涉及音频设备领域，特别涉及一种开关机静音控制电路、控制方法及音频设备。
 背景技术
目前带有音箱、喇叭的产品，在上电过程中，CPU和功放系统的一些耦合电容充电过程当中，容易出现pop音（爆破音），掉电过程中，耦合电容的放电过程也容易出现pop音，这种pop音如果不去控制，有可能导致在系统上电或者掉电过程中导致设备的损坏，pop音的存在对产品的体验也有很大的影响，一款好的音频产品只有正常系统出声音的情况下才输出声音，在上电和掉电过程当中应一直处于静音当中。
音频产品一般都有软件控制系统，在系统正常工作当中有MCU的存在，软件可以通过IO口去控制使能脚的电平高低，但是在上电以及系统掉电过程当中IO口是不可控的，因此需要通过硬件方式去实现使能脚的高低电平，从而控制pop音的产生。
因而，现有技术还有待改进和提高。
 技术问题
本发明实施例提供一种开关机静音控制电路、控制方法及音频设备，采用低成本的简易控制电路即可在上电以及掉电过程中输出高电平至静音电路，控制静音电路工作，从而消除开关机时的pop声，提高音频设备的产品体验。
 技术解决方案
第一方面，本发明实施例提供了一种开关机静音控制电路，所述开关机静音控制电路与音频设备的供电端和静音电路连接，其中，所述开关机静音控制电路包括充放电模块、第一开关模块和第二开关模块；开机上电时所述供电端向所述充放电模块充电，关机掉电时所述充放电模块向所述供电端放电，所述充放电模块在充电或放电过程中输出第一电平至所述第一开关模块，控制所述第一开关模块处于导通状态，由所述第一开关模块输出第二电平至所述第二开关模块，控制所述第二开关模块处于导通状态，由所述第二开关模块输出高电平至所述静音电路，控制所述静音电路开始工作。
进一步的，在所述的开关机静音控制电路中，所述充放电模块包括充放电单元和隔离单元，由所述隔离单元在开机上电和关机掉电时控制充电电流方向和放电电流方向，所述充放电单元根据所述充电电流方向和放电电流方向进行充电或放电。
进一步的，在所述的开关机静音控制电路中，所述充放电单元包括第一电容和第二电容，所述隔离单元包括第一二极管、第二二极管和第一电阻；所述第一二极管的正极连接所述第二二极管的负极、所述第一电阻的一端和所述供电端，所述第一二极管的负极连接所述第一开关模块和第二开关模块，还通过所述第二电容接地；所述第二二极管的正极连接所述第一电阻的另一端和所述第一开关模块，还通过所述第一电容接地。
进一步的，在所述的开关机静音控制电路中，所述第一开关模块包括第二电阻、第三电阻和第一三极管；所述第二电阻的一端连接所述第二二极管的正极，所述第二电阻的另一端连接所述第一三极管的基极；所述第一三极管的发射极连接所述第三电阻的一端，所述第三电阻的另一端连接所述第一二极管的负极，所述第一三极管的集电极连接所述第二开关模块。
进一步的，在所述的开关机静音控制电路中，所述第二开关模块包括第四电阻、第五电阻和第二三极管；所述第四电阻的一端连接所述第一三极管的集电极，所述第四电阻的另一端连接所述第二三极管的基极；所述第二三极管的集电极连接所述第一二极管的负极，所述第二三极管的发射极连接所述第五电阻的一端和所述静音电路；所述第五电阻的另一端接地。
进一步的，在所述的开关机静音控制电路中，所述第一三极管为PNP型三极管。
进一步的，在所述的开关机静音控制电路中，所述第二三极管为NPN型三极管。
第二方面，本发明实施例还提供了一种开关机静音控制方法，其包括如下步骤：
充放电模块在开机充电或关机放电过程中输出第一电平至第一开关模块，控制第一开关模块处于导通状态；
由第一开关模块输出第二电平至第二开关模块，控制第二开关模块处于导通状态；
由第二开关模块输出高电平至静音电路，控制静音电路开始工作。
第三方面，本发明实施例还提供了一种音频设备，包括供电端、静音电路和开关机静音控制电路，所述开关机静音控制电路与所述供电端和所述静音电路连接；
所述开关机静音控制电路包括充放电模块、第一开关模块和第二开关模块；开机上电时所述供电端向所述充放电模块充电，关机掉电时所述充放电模块向所述供电端放电，所述充放电模块在充电或放电过程中输出第一电平至所述第一开关模块，控制所述第一开关模块处于导通状态，由所述第一开关模块输出第二电平至所述第二开关模块，控制所述第二开关模块处于导通状态，由所述第二开关模块输出高电平至所述静音电路，控制所述静音电路开始工作；
所述第一电平为低电平，所述第二电平为高电平。
进一步的，在所述的音频设备中，所述充放电模块包括充放电单元和隔离单元，由所述隔离单元在开机上电和关机掉电时控制充电电流方向和放电电流方向，所述充放电单元根据所述充电电流方向和放电电流方向进行充电或放电。
进一步的，在所述的音频设备中，所述充放电单元包括第一电容和第二电容，所述隔离单元包括第一二极管、第二二极管和第一电阻；所述第一二极管的正极连接所述第二二极管的负极、所述第一电阻的一端和所述供电端，所述第一二极管的负极连接所述第一开关模块和所述第二开关模块，还通过所述第二电容接地；所述第二二极管的正极连接所述第一电阻的另一端和所述第一开关模块，还通过所述第一电容接地。
进一步的，在所述的音频设备中，当所述供电端开机上电时，所述供电端通过所述第一电阻向所述第一电容充电，且通过所述第一二极管向所述第二电容充电，在所述第一电容的充电过程中输出低电平至所述第一开关模块；当所述供电端关机掉电时，由于所述第一二极管的隔离作用，所述第二电容通往所述供电端的放电通路被隔离，使得所述第二电容中的电荷通过所述第一开关模块进行放电，而所述第一电容中的电荷则通过所述第二二极管进行释放，以使输出至所述第一开关模块的电平信号为低电平，从而控制所述第一电容和所述第二电容按预设路线进行充电和放电。
进一步的，在所述的音频设备中，所述第一开关模块包括第二电阻、第三电阻和第一三极管；所述第二电阻的一端连接所述第二二极管的正极，所述第二电阻的另一端连接所述第一三极管的基极；所述第一三极管的发射极连接所述第三电阻的一端，所述第三电阻的另一端连接所述第一二极管的负极，所述第一三极管的集电极连接所述第二开关模块。
进一步的，在所述的音频设备中，所述第二开关模块包括第四电阻、第五电阻和第二三极管；所述第四电阻的一端连接所述第一三极管的集电极，所述第四电阻的另一端连接所述第二三极管的基极；所述第二三极管的集电极连接所述第一二极管的负极，所述第二三极管的发射极连接所述第五电阻的一端和所述静音电路；所述第五电阻的另一端接地。
进一步的，在所述的音频设备中，所述第一三极管为PNP型三极管。
进一步的，在所述的音频设备中，所述第二三极管为NPN型三极管。
进一步的，在所述的音频设备中，当所述供电端开机上电时，输入至所述第一三极管的基极的电平信号为低电平，所述供电端的供电电压通过所述第一二极管和所述第三电阻后到达所述第一三极管的发射极，当所述第一三极管的发射极电压和基极电压之间的压差大于0.7V时，所述第一三极管保持导通状态且与所述第二三极管基极连接的所述第一三极管的集电极电压与发射极电压均为高电平，使得所述第一开关模块输出高电平至所述第二开关模块；而由于所述第二三极管的发射极接地，控制所述第二三极管处于导通状态且所述第二三极管的发射极电压与集电极电压均为高电平，使得所述开关机静音控制电路的输出端输出高电平至所述静音电路，以控制所述静音电路开始工作。
进一步的，在所述的音频设备中，当所述第一电容充电完成后，由于所述第一三极管的基极电压上升使得所述第一三极管处于截止状态，所述第一三极管的集电极输出低电平至所述第二三极管，使得所述第二三极管处于截止状态，进而控制所述开关机静音控制电路的输出端输出低电平至所述静音电路。
进一步的，在所述的音频设备中，当所述供电端关机掉电时，由于所述第一二极管的隔离作用，所述第二电容只能通过所述第三电阻和所述第一三极管进行放电，且所述第一电容立即通过所述第二二极管将电荷完全释放，使得所述第一三极管的基极为低电平，而由于所述第一三极管的发射极在所述第二电容的放电作用下为高电平，控制所述第一三极管处于导通状态其所述第一三极管的集电极电压为高电平，以使所述第二三极管处于导通状态且所述第二三极管的发射极电压与集电极电压均为高电平，进而使得所述开关机静音控制电路的输出端输出高电平至所述静音电路，以控制所述静音电路开始工作。
进一步的，在所述的音频设备中，当所述第二电容放电完成后，由于所述第一三极管的发射极电压下降使得所述第一三极管处于截止状态，所述第一三极管的集电极输出低电平至所述第二三极管，使得所述第二三极管处于截止状态，进而控制所述开关机静音控制电路的输出端输出低电平至所述静音电路。
 有益效果
本发明公开了一种开关机静音控制电路、控制方法及音频设备，其中，所述开关机静音控制电路与音频设备的供电端和静音电路连接，所述开关机静音控制电路包括充放电模块、第一开关模块和第二开关模块；开机上电时供电端向充放电模块充电，关机掉电时充放电模块向供电端放电，充放电模块在充电或放电过程中输出第一电平至第一开关模块，控制第一开关模块处于导通状态，由第一开关模块输出第二电平至第二开关模块，控制第二开关模块处于导通状态，由第二开关模块输出高电平至静音电路，控制静音电路开始工作。采用低成本的简易控制电路即可在上电以及掉电过程中输出高电平至静音电路，控制静音电路工作，从而消除开关机时的pop声，提高音频设备的产品体验。
 附图说明
图1为本发明实施例提供的开关机静音控制电路的结构框图。
图2为本发明实施例提供的开关机静音控制电路的电路图。
图3为本发明实施例提供的开关机静音控制电路应用实施例中上电时的电压模拟输出图。
图4为本发明实施例提供的开关机静音控制电路应用实施例中掉电时的电压模拟输出图。
图5为本发明实施例提供的开关机静音控制方法的流程图。
 本发明的实施方式
鉴于现有技术中音频设备上电掉电过程中会产生pop声的缺点，本发明的目的在于提供一种开关机静音控制电路、控制方法及音频设备，采用低成本的简易控制电路即可在上电以及掉电过程中输出高电平至静音电路，控制静音电路工作，从而消除开关机时的pop声，提高音频设备的产品体验。
为使本发明的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
请参阅图1，本发明提供的开关机静音控制电路100与音频设备的供电端和静音电路200连接，其中，所述供电端可以为VCC供电端，所述开关机静音控制电路100包括充放电模块10、第一开关模块11和第二开关模块12，所述充放电模块10、第一开关模块11和第二开关模块12均连接音频设备的VCC供电端，并且所述充放电模块10、第一开关模块11和第二开关模块12依次连接，所述第二开关模块12还连接所述静音电路200，通过第二开关模块12输出的电平信号控制静音电路200的工作状态，从而开启或关闭静音电路200。
具体地，当音频设备开机上电时，VCC供电端为开关机静音控制电路100提供直流供电电压，此时充放电模块10充电，而当音频设备关机掉电时，充放电模块10中存储的电量将释放，此时充放电模块10放电，充放电模块10在开机充电或者关机放电的过程中输出第一电平至第一开关模块11，控制第一开关模块11处于导通状态，之后由第一开关模块11输出第二电平至第二开关模块12，控制第二开关模块12处于导通状态，使得第二开关模块12输出高电平至静音电路200，控制静音电路200开始工作，从而消除在开机和关机过程中产生的pop声，解决了由于上电和掉电过程中控制器IO口不可控导致无法实现静音的问题，提升产品体验。
本实施例中，所述第一电平为低电平，第二电平为高电平，当然，在其他实施例中也可根据实际需求调整，仅需控制第二开关模块12输出高电平至静音电路200，使其正常工作即可，本发明对此不作限定。
进一步地，请一并参阅图2，所述充放电模块10包括充放电单元101和隔离单元102，所述隔离单元102连接所述充放电单元101，所述充放电单元101连接第一开关模块11，由隔离单元102在开机上电和关机掉电时控制充电电流方向和放电电流方向，所述充放电单元101根据所述充电电流方向和放电电流方向进行充电或放电，即本发明通过设置隔离单元102，控制充电和放电时的电流方向，保证充放电单元101按照预设的方向进行充电或放电，确保输出至第一开关模块11的电平信号的准确性，进而保证静音电路200能在开机和关机时正常工作，消除开关机过程中的pop声，提高产品的可靠性。
具体的，所述充放电单元101包括第一电容C1和第二电容C2，所述隔离单元102包括第一二极管D1、第二二极管D2和第一电阻R1；所述第一二极管D1的正极连接第二二极管D2的负极、第一电阻R1的一端和VCC供电端，所述第一二极管D1的负极连接第一开关模块11、第二开关模块12、还通过第二电容C2接地；所述第二二极管D2的正极连接第一电阻R1的另一端和第一开关模块11，还通过第一电容C1接地。
VCC供电端上电时通过第一电阻R1向第一电容C1充电，通过第一二极管D1向第二电容C2充电，在第一电容C1的充电过程中输出低电平至第一开关模块11；而当VCC供电端下电时，由于第一二极管D1的隔离作用，第二电容C2通往VCC供电端的放电通路被隔离，因此第二电容C2中的电荷通过第一开关模块11进行放电，而第一电容C1中的电荷则通过第二二极管D2迅速释放，使得输出至第一开关模块11的电平信号为低电平，从而控制第一电容C1和第二电容C2按预设路线进行充电和放电，使得无论在开机上电或关机掉电时，输出至第一开关模块11的电平信号均为低电平信号，控制其导通，进而控制后续的信号输出，保证静音电路200能及时启动工作，消除开关机过程中的pop声，确保音频设备开关机时的静音效果。
进一步地，所述第一开关模块11包括第二电阻R2、第三电阻R3和第一三极管Q1；所述第二电阻R2的一端连接第二二极管D2的正极，所述第二电阻R2的另一端连接第一三极管Q1的基极；所述第一三极管Q1的发射极连接第三电阻R3的一端，所述第三电阻R3的另一端连接第一二极管D1的负极，所述第一三极管Q1的集电极连接第二开关模块12。本实施例中，所述第一三极管Q1为PNP型三极管。
所述第二开关模块12包括第四电阻R4、第五电阻R5和第二三极管Q2；所述第四电阻R4的一端连接第一三极管Q1的集电极，所述第四电阻R4的另一端连接第二三极管Q2的基极；所述第二三极管Q2的集电极连接第一二极管D1的负极，所述第二三极管Q2的发射极连接第五电阻R5的一端和静音电路200；所述第五电阻R5的另一端接地。本实施例中，所述第二三极管Q2为NPN型三极管。
如上所述，无论处于开机上电、第一电容C1和第二电容C2处于充电状态时，或者关机掉电、第一电容C1和第二电容C2处于放电状态时，经第二电阻R2输入至第一三极管Q1基极的电平信号均为低电平。
其中开机上电时，输入至第一三极管Q1的基极的电平信号为低电平，而VCC供电端的供电电压通过第一二极管D1和第三电阻R3后到达第一三极管Q1的发射极，当发射极电压和基极电压之间的压差大于0.7V时第一三极管Q1即保持导通状态，此时与第二三极管Q2基极连接的第一三极管Q1的集电极电压与发射极电压相等，均为高电平，即第一开关模块11输出高电平至第二开关模块12；由于第二三极管Q2的发射极下拉到地，因此第二三极管Q2将同样处于导通状态，第二三极管Q2的发射极电压与集电极电压相等，均为高电平，即开关机静音控制电路100的输出端Out_put将输出高电平至静音电路200，控制其开始工作。当第一电容C1充电完成后，第一三极管Q1由于基极电压上升将处于截止状态，集电极输出低电平至第二三极管Q2，使第二三极管Q2同样处于截止状态，控制输出端Out_put输出低电平至静音电路200。
本发明应用实施例中，上电时的电压模拟输出图如图3所示，其中标注1号的为VCC电压，标注2号的为输出端Out_put电压，可看到开关机静音控制电路100的输出端Out_put信号在上电瞬间变为高电平，并维持一段时间为高电平，之后转为低电平，在高电平持续的这段时间通过静音电路200消除pop音，提高开机静音效果。其中第一电容C1和第一电阻R1的容值和阻值大小决定高电平持续时间，可根据实际需求进行调节以满足不同应用场合。
当关机掉电时，由于第一二极管D1的隔离作用，第二电容C2只能通过第三电阻R3和第一三极管Q1进行放电，在VCC掉电同时，第一电容C1立即通过第二二极管D2将电荷完全释放，使得第一三极管Q1的基极为低电平，而由于第一三极管Q1的发射极在第二电容C2的放电作用下为高电平，因此第一三极管Q1导通，其集电极同为高电平，同样使得第二三极管Q2同样处于导通状态，第二三极管Q2的发射极电压与集电极电压相等，均为高电平，即开关机静音控制电路100的输出端Out_put将输出高电平至静音电路200，控制其开始工作。当第二电容C2放电完成后，第一三极管Q1由于发射极电压下降将处于截止状态，集电极输出低电平至第二三极管Q2，使第二三极管Q2同样处于截止状态，控制输出端Out_put输出低电平至静音电路200。
本发明应用实施例中，掉电时的电压模拟输出图如图4所示，其中标注1号的为VCC电压，标注2号的为输出端Out_put电压，可看到开关机静音控制电路100的输出端Out_put信号在掉电瞬间变为高电平，并维持一段时间为高电平，之后转为低电平，在高电平持续的这段时间通过静音电路200消除pop音，提高关机静音效果。其中第二电容C2和第一电阻R1的容值和阻值大小决定高电平持续时间，可根据实际需求进行调节以满足不同应用场合。
基于上述开关机静音控制电路，本发明还相应提供一种开关机静音控制方法，如图5所示，所述开关机静音控制方法包括如下步骤：
S100、充放电模块在开机充电或关机放电过程中输出第一电平至第一开关模块，控制第一开关模块处于导通状态；
S200、由第一开关模块输出第二电平至第二开关模块，控制第二开关模块处于导通状态；
S300、由第二开关模块输出高电平至静音电路，控制静音电路开始工作。基于上述开关机静音控制电路，本发明还相应提供一种音频设备，其包括供电端、静音电路和如上所述的开关机静音控制电路，由于上文已对所述开关机静音控制电路进行了详细描述，此处不作详述。
综上所述，本发明提供的开关机静音控制电路、控制方法及音频设备中，所述开关机静音控制电路与音频设备的供电端和静音电路连接，所述开关机静音控制电路包括充放电模块、第一开关模块和第二开关模块；开机上电时供电端向充放电模块充电，关机掉电时充放电模块向供电端放电，充放电模块在充电或放电过程中输出第一电平至第一开关模块，控制第一开关模块处于导通状态，由第一开关模块输出第二电平至第二开关模块，控制第二开关模块处于导通状态，由第二开关模块输出高电平至静音电路，控制静音电路开始工作。采用低成本的简易控制电路即可在上电以及掉电过程中输出高电平至静音电路，控制静音电路工作，从而消除开关机时的pop声，提高音频设备的产品体验。
可以理解的是，对本领域普通技术人员来说，可以根据本发明的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本发明所附的权利要求的保护范围。

Claims (20)

  1. 一种开关机静音控制电路，所述开关机静音控制电路与音频设备的供电端和静音电路连接，其中，所述开关机静音控制电路包括充放电模块、第一开关模块和第二开关模块；开机上电时所述供电端向所述充放电模块充电，关机掉电时所述充放电模块向所述供电端放电，所述充放电模块在充电或放电过程中输出第一电平至所述第一开关模块，控制所述第一开关模块处于导通状态，由所述第一开关模块输出第二电平至所述第二开关模块，控制所述第二开关模块处于导通状态，由所述第二开关模块输出高电平至所述静音电路，控制所述静音电路开始工作。
  2. 根据权利要求1所述的开关机静音控制电路，其中，所述充放电模块包括充放电单元和隔离单元，由所述隔离单元在开机上电和关机掉电时控制充电电流方向和放电电流方向，所述充放电单元根据所述充电电流方向和放电电流方向进行充电或放电。
  3. 根据权利要求2所述的开关机静音控制电路，其中，所述充放电单元包括第一电容和第二电容，所述隔离单元包括第一二极管、第二二极管和第一电阻；所述第一二极管的正极连接所述第二二极管的负极、所述第一电阻的一端和所述供电端，所述第一二极管的负极连接所述第一开关模块和所述第二开关模块，还通过所述第二电容接地；所述第二二极管的正极连接所述第一电阻的另一端和所述第一开关模块，还通过所述第一电容接地。
  4. 根据权利要求3所述的开关机静音控制电路，其中，所述第一开关模块包括第二电阻、第三电阻和第一三极管；所述第二电阻的一端连接所述第二二极管的正极，所述第二电阻的另一端连接所述第一三极管的基极；所述第一三极管的发射极连接所述第三电阻的一端，所述第三电阻的另一端连接所述第一二极管的负极，所述第一三极管的集电极连接所述第二开关模块。
  5. 根据权利要求4所述的开关机静音控制电路，其中，所述第二开关模块包括第四电阻、第五电阻和第二三极管；所述第四电阻的一端连接所述第一三极管的集电极，所述第四电阻的另一端连接所述第二三极管的基极；所述第二三极管的集电极连接所述第一二极管的负极，所述第二三极管的发射极连接所述第五电阻的一端和所述静音电路；所述第五电阻的另一端接地。
  6. 根据权利要求4所述的开关机静音控制电路，其中，所述第一三极管为PNP型三极管。
  7. 根据权利要求5所述的开关机静音控制电路，其中，所述第二三极管为NPN型三极管。
  8. 一种开关机静音控制方法，其中，包括如下步骤：
    充放电模块在开机充电或关机放电过程中输出第一电平至第一开关模块，控制第一开关模块处于导通状态；
    由第一开关模块输出第二电平至第二开关模块，控制第二开关模块处于导通状态；
    由第二开关模块输出高电平至静音电路，控制静音电路开始工作。
  9. 一种音频设备，其中，所述音频设备包括供电端、静音电路和开关机静音控制电路，所述开关机静音控制电路与所述供电端和所述静音电路连接；
    所述开关机静音控制电路包括充放电模块、第一开关模块和第二开关模块；开机上电时所述供电端向所述充放电模块充电，关机掉电时所述充放电模块向所述供电端放电，所述充放电模块在充电或放电过程中输出第一电平至所述第一开关模块，控制所述第一开关模块处于导通状态，由所述第一开关模块输出第二电平至所述第二开关模块，控制所述第二开关模块处于导通状态，由所述第二开关模块输出高电平至所述静音电路，控制所述静音电路开始工作；
    所述第一电平为低电平，所述第二电平为高电平。
  10. 根据权利要求9所述的音频设备，其中，所述充放电模块包括充放电单元和隔离单元，由所述隔离单元在开机上电和关机掉电时控制充电电流方向和放电电流方向，所述充放电单元根据所述充电电流方向和放电电流方向进行充电或放电。
  11. 根据权利要求10所述的音频设备，其中，所述充放电单元包括第一电容和第二电容，所述隔离单元包括第一二极管、第二二极管和第一电阻；所述第一二极管的正极连接所述第二二极管的负极、所述第一电阻的一端和所述供电端，所述第一二极管的负极连接所述第一开关模块和所述第二开关模块，还通过所述第二电容接地；所述第二二极管的正极连接所述第一电阻的另一端和所述第一开关模块，还通过所述第一电容接地。
  12. 根据权利要求11所述的音频设备，其中，当所述供电端开机上电时，所述供电端通过所述第一电阻向所述第一电容充电，且通过所述第一二极管向所述第二电容充电，在所述第一电容的充电过程中输出低电平至所述第一开关模块；当所述供电端关机掉电时，由于所述第一二极管的隔离作用，所述第二电容通往所述供电端的放电通路被隔离，使得所述第二电容中的电荷通过所述第一开关模块进行放电，而所述第一电容中的电荷则通过所述第二二极管进行释放，以使输出至所述第一开关模块的电平信号为低电平，从而控制所述第一电容和所述第二电容按预设路线进行充电和放电。
  13. 根据权利要求11所述的音频设备，其中，所述第一开关模块包括第二电阻、第三电阻和第一三极管；所述第二电阻的一端连接所述第二二极管的正极，所述第二电阻的另一端连接所述第一三极管的基极；所述第一三极管的发射极连接所述第三电阻的一端，所述第三电阻的另一端连接所述第一二极管的负极，所述第一三极管的集电极连接所述第二开关模块。
  14. 根据权利要求13所述的音频设备，其中，所述第二开关模块包括第四电阻、第五电阻和第二三极管；所述第四电阻的一端连接所述第一三极管的集电极，所述第四电阻的另一端连接所述第二三极管的基极；所述第二三极管的集电极连接所述第一二极管的负极，所述第二三极管的发射极连接所述第五电阻的一端和所述静音电路；所述第五电阻的另一端接地。
  15. 根据权利要求14所述的音频设备，其中，所述第一三极管为PNP型三极管。
  16. 根据权利要求15所述的音频设备，其中，所述第二三极管为NPN型三极管。
  17. 根据权利要求16所述的音频设备，其中，当所述供电端开机上电时，输入至所述第一三极管的基极的电平信号为低电平，所述供电端的供电电压通过所述第一二极管和所述第三电阻后到达所述第一三极管的发射极，当所述第一三极管的发射极电压和基极电压之间的压差大于0.7V时，所述第一三极管保持导通状态且与所述第二三极管基极连接的所述第一三极管的集电极电压与发射极电压均为高电平，使得所述第一开关模块输出高电平至所述第二开关模块；而由于所述第二三极管的发射极接地，控制所述第二三极管处于导通状态且所述第二三极管的发射极电压与集电极电压均为高电平，使得所述开关机静音控制电路的输出端输出高电平至所述静音电路，以控制所述静音电路开始工作。
  18. 根据权利要求17所述的音频设备，其中，当所述第一电容充电完成后，由于所述第一三极管的基极电压上升使得所述第一三极管处于截止状态，所述第一三极管的集电极输出低电平至所述第二三极管，使得所述第二三极管处于截止状态，进而控制所述开关机静音控制电路的输出端输出低电平至所述静音电路。
  19. 根据权利要求16所述的音频设备，其中，当所述供电端关机掉电时，由于所述第一二极管的隔离作用，所述第二电容只能通过所述第三电阻和所述第一三极管进行放电，且所述第一电容立即通过所述第二二极管将电荷完全释放，使得所述第一三极管的基极为低电平，而由于所述第一三极管的发射极在所述第二电容的放电作用下为高电平，控制所述第一三极管处于导通状态其所述第一三极管的集电极电压为高电平，以使所述第二三极管处于导通状态且所述第二三极管的发射极电压与集电极电压均为高电平，进而使得所述开关机静音控制电路的输出端输出高电平至所述静音电路，以控制所述静音电路开始工作。
  20. 根据权利要求19所述的音频设备，其中，当所述第二电容放电完成后，由于所述第一三极管的发射极电压下降使得所述第一三极管处于截止状态，所述第一三极管的集电极输出低电平至所述第二三极管，使得所述第二三极管处于截止状态，进而控制所述开关机静音控制电路的输出端输出低电平至所述静音电路。
PCT/CN2018/099372 2017-08-10 2018-08-08 开关机静音控制电路、控制方法及音频设备 WO2019029563A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18844308.9A EP3668111B1 (en) 2017-08-10 2018-08-08 Mute control method used upon power-on or power-off and audio device
US16/637,762 US10826455B2 (en) 2017-08-10 2018-08-08 Mute control circuit used upon power-on or power-of, control method, and audio device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710679849.XA CN107396243A (zh) 2017-08-10 2017-08-10 一种开关机静音控制电路、控制方法及音频设备
CN201710679849.X 2017-08-10

Publications (1)

Publication Number Publication Date
WO2019029563A1 true WO2019029563A1 (zh) 2019-02-14

Family

ID=60355402

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/099372 WO2019029563A1 (zh) 2017-08-10 2018-08-08 开关机静音控制电路、控制方法及音频设备

Country Status (4)

Country Link
US (1) US10826455B2 (zh)
EP (1) EP3668111B1 (zh)
CN (1) CN107396243A (zh)
WO (1) WO2019029563A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10826455B2 (en) 2017-08-10 2020-11-03 JRD Communication (Shenzhen) Ltd. Mute control circuit used upon power-on or power-of, control method, and audio device
CN113676819A (zh) * 2021-10-21 2021-11-19 武汉市聚芯微电子有限责任公司 软静音控制电路、软静音控制方法以及设备

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110290446B (zh) * 2019-06-11 2021-09-07 晶晨半导体(上海)股份有限公司 一种快速开关机防止爆音的静音电路
CN110662136A (zh) * 2019-09-23 2020-01-07 深圳市华星光电技术有限公司 音频装置及显示面板
CN110602605A (zh) * 2019-10-11 2019-12-20 广东美的白色家电技术创新中心有限公司 语音开关电路和语音设备
CN111263268B (zh) * 2020-01-15 2022-02-01 深圳创维数字技术有限公司 一种断电时喇叭pop音消除电路及电子产品
CN112954546A (zh) * 2021-02-01 2021-06-11 广州朗国电子科技有限公司 一种上电下电去爆破音的控制电路、模块及终端设备
CN113098462B (zh) * 2021-04-02 2023-12-22 上海季丰电子股份有限公司 一种快速上下电电路及其控制方法
CN113115180B (zh) * 2021-04-28 2022-08-02 广州朗国电子科技股份有限公司 一种音频输出端的爆破音去除装置及音频设备
CN114125660B (zh) * 2021-11-23 2023-08-15 深圳市长丰影像器材有限公司 一种消除开机爆破音的音频系统及供电控制方法
CN115103272B (zh) * 2022-08-24 2022-12-02 上海芯龙半导体技术股份有限公司南京分公司 静音控制方法、音频功放电路以及音频功放芯片

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200953603Y (zh) * 2006-10-18 2007-09-26 青岛海信电器股份有限公司 开关机静音电路及具有所述静音电路的电视机
CN101174824A (zh) * 2006-10-30 2008-05-07 青岛海信电器股份有限公司 开关机静音电路
CN201238284Y (zh) * 2008-08-01 2009-05-13 青岛海信宽带多媒体技术股份有限公司 开关机静音电路及具有所述静音电路的机顶盒
US20090226007A1 (en) * 2008-03-10 2009-09-10 Kabushiki Kaisha Toshiba Mute circuit
CN107396243A (zh) * 2017-08-10 2017-11-24 惠州Tcl移动通信有限公司 一种开关机静音控制电路、控制方法及音频设备
CN206865726U (zh) * 2017-06-12 2018-01-09 广州视源电子科技股份有限公司 防爆音电路及电子设备

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200151266Y1 (ko) * 1996-11-27 1999-07-15 윤종용 오디오시스템에서 전원 온/오 프시 잡음 제거 회로
TWI230557B (en) * 2003-11-06 2005-04-01 Liteon It Corp Mute circuit for use in the duration of power switching
TW200726293A (en) * 2005-12-29 2007-07-01 Tatung Co Muting circuit capable of eliminating noise generated in powering off and electronic apparatus incorporating the muting circuit
US8218793B2 (en) * 2006-12-11 2012-07-10 Mediatek Inc. Apparatus and muting circuit
US20100183166A1 (en) * 2009-01-20 2010-07-22 Simon Shan Lin Sun External car amplifier capable of producing high power
TW201107952A (en) * 2009-08-25 2011-03-01 Elitegroup Computer Sys Co Ltd Power-supply expansion system and its method thereof
TWI410144B (zh) * 2010-01-11 2013-09-21 Hon Hai Prec Ind Co Ltd 爆音抑制電路
CN102333264A (zh) * 2010-07-15 2012-01-25 鸿富锦精密工业（深圳）有限公司 静音控制电路及具有该静音控制电路的电子装置
CN202059555U (zh) * 2010-12-23 2011-11-30 康佳集团股份有限公司 一种消除开机杂音的电路
CN203104756U (zh) * 2013-02-21 2013-07-31 深圳市中通福瑞电子科技有限公司 一种开关机静音电路
JP2014191253A (ja) * 2013-03-28 2014-10-06 Panasonic Corp オーディオ再生装置
EP2879270B1 (en) * 2013-04-17 2016-09-21 Huawei Technologies Co., Ltd. Identification circuit of power supply device, and powered device
CN203708454U (zh) * 2013-09-11 2014-07-09 东莞市远峰科技有限公司 一种用于消除电视盒的音频噪声电路
CN205666814U (zh) * 2016-06-13 2016-10-26 浪潮集团有限公司 一种用于消除Speaker Pop声的电路
JP6315125B2 (ja) * 2017-03-23 2018-04-25 ヤマハ株式会社 信号処理装置およびプログラム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200953603Y (zh) * 2006-10-18 2007-09-26 青岛海信电器股份有限公司 开关机静音电路及具有所述静音电路的电视机
CN101174824A (zh) * 2006-10-30 2008-05-07 青岛海信电器股份有限公司 开关机静音电路
US20090226007A1 (en) * 2008-03-10 2009-09-10 Kabushiki Kaisha Toshiba Mute circuit
CN201238284Y (zh) * 2008-08-01 2009-05-13 青岛海信宽带多媒体技术股份有限公司 开关机静音电路及具有所述静音电路的机顶盒
CN206865726U (zh) * 2017-06-12 2018-01-09 广州视源电子科技股份有限公司 防爆音电路及电子设备
CN107396243A (zh) * 2017-08-10 2017-11-24 惠州Tcl移动通信有限公司 一种开关机静音控制电路、控制方法及音频设备

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10826455B2 (en) 2017-08-10 2020-11-03 JRD Communication (Shenzhen) Ltd. Mute control circuit used upon power-on or power-of, control method, and audio device
CN113676819A (zh) * 2021-10-21 2021-11-19 武汉市聚芯微电子有限责任公司 软静音控制电路、软静音控制方法以及设备

Also Published As

Publication number Publication date
US10826455B2 (en) 2020-11-03
US20200244241A1 (en) 2020-07-30
EP3668111A1 (en) 2020-06-17
EP3668111A4 (en) 2021-04-28
CN107396243A (zh) 2017-11-24
EP3668111B1 (en) 2023-10-04

Similar Documents

Publication Publication Date Title
WO2019029563A1 (zh) 开关机静音控制电路、控制方法及音频设备
WO2018036370A1 (zh) 一种缓启动电路及包含该电路的电源板和业务单板
CN204145720U (zh) 一种音频装置的噪声消除电路
CN109729479B (zh) 音频播放电路以及音频播放设备
CN103166208A (zh) 抑制浪涌电流的供电电路
US8335322B2 (en) Mute control circuit and electronic device using same
CN213028495U (zh) 一种消除开关机杂音的音频电路和音频设备
WO2019085544A1 (zh) 一种开关电源输出软启动电路
CN104469622A (zh) 一种消除功放冲击声的电路
CN202261772U (zh) 一种静音失效保护电路
CN204259144U (zh) 一种消除功放冲击声的电路
TW201342944A (zh) 防爆音電路
US20140348343A1 (en) Audio device for suppressing noise
CN210641059U (zh) 一种用于音频功率放大器的掉电静音电路
CN114697828A (zh) 功放控制电路、电源控制电路及音频设备
CN109473742B (zh) 电池短路双重保护电路
CN103425071A (zh) 开关电源能效控制电路
WO2017219737A1 (zh) 一种机顶盒断电放电电路及放电方法
CN102098011B (zh) 音频功率放大器静音快速控制电路
CN203015093U (zh) 一种车载多媒体的静音电路
CN217240917U (zh) Pop音处理电路和播放装置
CN218783718U (zh) 一种放电电路、系统及低压直流用电设备
JP6083429B2 (ja) ミュート制御回路
CN216852310U (zh) 耳机关机电路以及头戴耳机
CN114764106A (zh) 掉电检测电路、电源控制电路及音频设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18844308

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2018844308

Country of ref document: EP

Effective date: 20200310