WO2018133155A1 - 一种音频输出电路及音频设备 - Google Patents

一种音频输出电路及音频设备 Download PDF

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Publication number
WO2018133155A1
WO2018133155A1 PCT/CN2017/074158 CN2017074158W WO2018133155A1 WO 2018133155 A1 WO2018133155 A1 WO 2018133155A1 CN 2017074158 W CN2017074158 W CN 2017074158W WO 2018133155 A1 WO2018133155 A1 WO 2018133155A1
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WO
WIPO (PCT)
Prior art keywords
mute control
audio
resistor
microcontroller
switch tube
Prior art date
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Ceased
Application number
PCT/CN2017/074158
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English (en)
French (fr)
Inventor
李文东
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US15/526,283 priority Critical patent/US10224889B2/en
Publication of WO2018133155A1 publication Critical patent/WO2018133155A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/007—Protection circuits for transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/22—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/321—Use of a microprocessor in an amplifier circuit or its control circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G2201/00—Indexing scheme relating to subclass H03G
    • H03G2201/10—Gain control characterised by the type of controlled element
    • H03G2201/103—Gain control characterised by the type of controlled element being an amplifying element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems

Definitions

  • the present invention relates to the field of audio device technologies, and in particular, to an audio output circuit and an audio device to which the audio output circuit is applied.
  • the structure of the audio output circuit of the audio device is as shown in FIG. Among them, SP_Mute is a mute control signal, which can be provided by the main control chip of the audio device, AMP VCC is the power supply voltage of the audio power amplifier, SP_Out is the audio signal output to the speaker, and R11 and R12 are resistors.
  • the POP tone when the audio device is powered on can be avoided by controlling the power timing and the mute control timing of the audio power amplifier through the master chip of the audio device.
  • the power supply timing and the mute control timing of the audio power amplifier cannot be controlled due to the power failure of the main control chip of the audio device at the moment of power failure, and the hardware circuit design is unreasonable, which may result in a momentary power failure.
  • POP sound A schematic diagram of the control timing and output waveform of the audio output circuit of the audio device in the prior art is shown in FIG. 2 .
  • the curve S1 is the waveform of the mute control signal SP_Mute
  • the curve S2 is the waveform of the AMP VCC
  • the curve S3 is the waveform of the SP_Out.
  • the invention provides an audio output circuit and an audio device, so as to realize the mute control of the moment when the audio device is powered off, prevent the generation of POP sound, and improve the product quality and user experience of the audio device.
  • An audio output circuit includes an audio power amplifier, a mute control circuit and a microcontroller
  • the audio power amplifier includes a power input terminal, a mute control terminal and an audio signal output end, wherein the power input terminal is used for connecting a power source to obtain a power source a voltage
  • the mute control terminal is connected to the microcontroller through the mute control circuit, and is grounded through a pull-down resistor
  • the audio signal output terminal is configured to output an audio signal
  • the mute control circuit is further connected to the power source. And configured to disconnect the connection between the mute control end and the microcontroller when the power supply voltage is less than a preset voltage.
  • the mute control circuit is further configured to: when the power voltage is greater than or equal to a preset voltage, turn on a connection between the mute control end and the microcontroller.
  • the mute control circuit includes a Zener diode, a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor, and a negative pole of the Zener diode
  • the power source is connected, the anode of the Zener diode is connected to the base of the first switch tube through the first resistor, and the base of the first switch tube is also grounded through the second resistor.
  • the emitter of the first switch tube is grounded, the collector of the first switch tube is connected to the base of the second switch tube through the third resistor, and the base of the second switch tube also passes through the first a fourth resistor is connected to the emitter of the second switch tube, and an emitter of the second switch tube is further connected to the microcontroller through the fifth resistor, a collector of the second switch tube and the Silent console connection.
  • the Zener diode operates in a reverse breakdown state, and the first switch tube is turned on; if the microcontroller outputs a high level, The second switch is turned on, the connection between the mute control terminal and the microcontroller is turned on, the audio power amplifier works normally; if the microcontroller outputs a low level, then the The second switch is turned off, the connection between the mute control terminal and the microcontroller is disconnected, and the level of the mute control terminal is changed to a low level by the pull-down resistor, the audio The power amplifier stops outputting the audio signal.
  • the Zener diode operates in a reverse-off state, and the first switch tube and the second switch tube are both turned off, and the mute control end is The connection between the microcontrollers is disconnected, and the level of the mute control terminal changes to a low level under the action of the pull-down resistor to control the audio power amplifier to stop outputting the audio signal.
  • the preset voltage is greater than or equal to a stable voltage of the Zener diode.
  • An audio device includes an audio power amplifier, a mute control circuit, a microcontroller, a power supply, and a speaker, the audio power amplifier including a power input terminal, a mute control terminal, and an audio signal output terminal, the power input terminal and the power source Connected to obtain a power supply voltage, the mute control terminal is connected to the microcontroller through the mute control circuit, and is grounded through a pull-down resistor, and the audio signal output end is connected to the speaker for outputting an audio signal.
  • the mute control circuit is further connected to the power source, and is configured to disconnect the connection between the mute control end and the microcontroller when the power supply voltage is less than a preset voltage.
  • the mute control circuit is further configured to: when the power voltage is greater than or equal to a preset voltage, turn on a connection between the mute control end and the microcontroller.
  • the mute control circuit includes a Zener diode, a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor, and a negative pole of the Zener diode
  • the power source is connected, the anode of the Zener diode is connected to the base of the first switch tube through the first resistor, and the base of the first switch tube is also grounded through the second resistor.
  • the emitter of the first switch tube is grounded, the collector of the first switch tube is connected to the base of the second switch tube through the third resistor, and the base of the second switch tube also passes through the first a fourth resistor is connected to the emitter of the second switch tube, and an emitter of the second switch tube is further connected to the microcontroller through the fifth resistor, a collector of the second switch tube and the Silent console connection.
  • the Zener diode operates in a reverse breakdown state, and the first switch tube is turned on; if the microcontroller outputs a high level, The second switch is turned on, the connection between the mute control terminal and the microcontroller is turned on, the audio power amplifier works normally; if the microcontroller outputs a low level, then the The second switch is turned off, the connection between the mute control terminal and the microcontroller is disconnected, and the level of the mute control terminal is changed to a low level by the pull-down resistor, the audio The power amplifier stops outputting the audio signal.
  • the Zener diode operates in a reverse-off state, and the first switch tube and the second switch tube are both turned off, and the mute control end is The connection between the microcontrollers is disconnected, and the level of the mute control terminal changes to a low level under the action of the pull-down resistor to control the audio power amplifier to stop outputting the audio signal.
  • the preset voltage is greater than or equal to a stable voltage of the Zener diode.
  • the audio output circuit of the present invention passes through the mute control end of the audio power amplifier and the microcontroller
  • a mute control circuit is disposed between the mute control circuit and the power supply of the audio power amplifier, wherein when the power supply voltage is less than the preset voltage, the mute control circuit disconnects between the mute control end and the microcontroller
  • the connection is such that the level of the mute control terminal is pulled down to a low level by the pull-down resistor, thereby controlling the audio power amplifier to stop outputting the audio signal, which can effectively prevent the audio device from generating a POP at the moment of power failure. Sound, which helps to improve the product quality and user experience of audio equipment.
  • FIG. 1 is a schematic structural diagram of an audio output circuit of an audio device in the prior art
  • FIG. 2 is a schematic diagram of control timing and output waveforms of an audio output circuit of an audio device in the prior art
  • FIG. 3 is a schematic structural diagram of an audio output circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of control timing and output waveforms of an audio output circuit according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an audio device according to an embodiment of the present invention.
  • spatially relative terms such as “under”, “below”, “lower”, “above”, “upper”, etc. may be used herein to describe one element as shown in the drawings. Or the relationship of a feature to another component or feature(s). It can be understood that when an element or layer is referred to as “on”, “connected” or “coupled” to another element or layer, Connected to or coupled to another element or layer, or an intervening element or layer. in contrast, When an element is referred to as being “directly on” another element or layer, “directly connected” or “directly coupled” to another element or layer, there are no intervening elements or layers.
  • an audio output circuit 100 including an audio power amplifier 110, a mute control circuit 130, and a microcontroller 150.
  • the audio power amplifier 110 includes a power input terminal VCC, and is muted. a control terminal/SD and an audio signal output terminal Out, the power input terminal VCC is used to connect the power source AMP_VCC to obtain a power voltage, and the mute control terminal/SD is connected to the microcontroller 150 through the mute control circuit 130.
  • the audio signal output terminal Out is used for outputting an audio signal
  • the mute control circuit 130 is further connected to the power source AMP_VCC for guiding when the power supply voltage is greater than or equal to a preset voltage. Passing the connection between the mute control terminal /SD and the microcontroller 150, and disconnecting between the mute control terminal /SD and the microcontroller 150 when the power supply voltage is less than a preset voltage Connection.
  • the mute control circuit 130 when the power source AMP_VCC is working normally, the power supply voltage is always greater than the preset voltage, and the mute control circuit 130 turns on the connection between the mute control terminal/SD and the microcontroller 150.
  • the mute control circuit 130 outputs a corresponding level signal to the mute controller terminal/SD of the audio power amplifier 110 according to the high and low output levels of the microcontroller 150, specifically, when the microcontroller 150 outputs When the level is high, the mute control circuit 130 outputs a high level to the mute controller terminal /SD of the audio power amplifier 110, and when the microcontroller 150 outputs a low level, the mute control circuit 130 goes to the audio power amplifier 110.
  • the mute controller end / SD output is low.
  • the audio power amplifier 110 switches to the normal working mode when the mute controller terminal /SD is at a high level, and switches to the silent mode when the mute controller terminal /SD is at a low level.
  • the audio power amplifier 110 When the audio power amplifier 110 is in the normal operation mode, when an audio signal is input, the audio power amplifier 110 amplifies the audio signal and outputs the audio signal from the audio signal output Out to the speaker; the audio power amplifier 110 In the silent mode, the audio power amplifier 110 does not have an audio signal output, and the speaker is muted.
  • the microcontroller 110 cannot immediately control the level of the mute control terminal/SD to become a low level in the power-down state, that is, the mute control There is a certain delay period between the level of the terminal/SD being switched from a high level to a low level.
  • the power supply voltage output by the power source AMP_VCC is gradually decreased after the audio device is powered off, if there is a noise signal in the audio output circuit 100 before the voltage is lowered to a certain voltage (for example, the microcontroller 150 is powered off)
  • the noise signal is amplified by the audio power amplifier 110 and output to the speaker, thereby forming a POP tone, that is, a plosive sound.
  • the power supply voltage output by the power supply AMP_VCC is monitored by the mute control circuit 130, and the power supply voltage is less than
  • the connection between the mute control terminal /SD and the microcontroller 150 is disconnected, so that the mute control terminal /SD is locked in the low battery under the pull-down of the pull-down resistor R0.
  • Flat that is, the audio power amplifier 110 does not have an audio signal output, and the speaker is muted.
  • the mute control circuit 130 includes a Zener diode D, a first switch transistor Q1, a second switch transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
  • a fifth resistor R5 a cathode of the Zener diode D is connected to the power source AMP_VCC, and a cathode of the Zener diode D is connected to a base b of the first switching transistor Q1 through the first resistor R1.
  • the base b of the first switching transistor Q1 is also grounded through the second resistor R2, the emitter e of the first switching transistor Q1 is grounded, and the collector c of the first switching transistor Q1 passes through the third resistor R3 is connected to the base b of the second switching transistor Q2, and the base b of the second switching transistor Q2 is further connected to the emitter e of the second switching transistor Q2 through the fourth resistor R4.
  • the emitter e of the second switching transistor Q2 is also connected to the microcontroller 150 via the fifth resistor R5, and the collector c of the second switching transistor Q2 is connected to the mute control terminal /SD.
  • the Zener diode D operates in a reverse breakdown state, so that the base b of the first switching transistor Q1 is A forward bias is formed between the emitters e, the first switching transistor Q1 is turned on, and the level of the base b of the second switching transistor Q2 is pulled low.
  • the microcontroller 150 outputs a high level, a reverse bias is formed between the base b and the emitter e of the second switching transistor Q2, and the second switching transistor Q2 is turned on.
  • the connection between the mute control terminal /SD and the microcontroller 150 is turned on, and the collector c of the second switch Q2 is at a high level, that is, the mute control terminal /SD is high. Level to control the audio power amplifier 110 to switch to the normal operating mode. If the microcontroller 150 outputs a low level, the base b and the emitter e of the second switch Q2 are both low, and the second switch Q2 is turned off, thereby making the mute control end The connection between /SD and the microcontroller 150 is disconnected, and the level of the mute control terminal /SD becomes a low level under the action of the pull-down resistor R0 to control the audio power amplifier 110. Switch to silent mode and stop outputting audio signals.
  • the regulated diode D tube operates in a reverse cut-off state, and the first switch tube Q1 and the second switch tube Q2
  • the connection between the mute control terminal /SD and the microcontroller 150 is turned off, and the level of the mute control terminal /SD becomes a low level under the action of the pull-down resistor R0.
  • the output of the audio signal is stopped.
  • the preset voltage is greater than or equal to the stable voltage of the Zener diode D.
  • the output power voltage is 13V
  • the stable voltage of the Zener diode D is 9.1V, that is, the reverse breakdown voltage is 9.1V.
  • the Zener diode D operates in a reverse breakdown state, forming a forward bias between the base b and the emitter e of the first switching transistor Q1, thereby The first switching transistor Q1 is turned on. Further, the conduction of the first switching transistor Q1 causes the level of the base b of the second switching transistor Q2 to be pulled low.
  • the microcontroller 150 outputs a high level, a reverse bias is formed between the base b and the emitter e of the second switching transistor Q2, so that the second switching transistor Q2 is also turned on, and the mute control terminal/SD and the micro The connection between the controllers 150 is turned on.
  • the power supply voltage outputted by the power supply AMP_VCC gradually decreases.
  • the Zener diode D operates in a reverse-off state.
  • the first switch tube Q1 and the second switch tube Q2 are both turned off, and the mute control terminal/SD
  • the connection with the microcontroller 150 is disconnected, and the mute control terminal /SD is pulled down to a low level, thereby controlling the audio power amplifier 110 to switch to the silent mode to stop outputting the audio signal.
  • FIG. 4 is a schematic diagram of control timing and output waveforms of the audio output circuit 100 according to an embodiment of the present invention, wherein a curve S11 is a level value change waveform of the mute control terminal/SD, and S12 is a power source AMP_VCC output.
  • the waveform of the power supply voltage, Vt is a preset voltage (9.1 V in this embodiment), and S13 is a waveform of the audio signal SP_Out output by the audio power amplifier 110.
  • Vt is a preset voltage (9.1 V in this embodiment)
  • S13 is a waveform of the audio signal SP_Out output by the audio power amplifier 110.
  • the size of the preset voltage Vt can be adjusted according to different circuit application requirements, and only need to ensure that the preset voltage Vt is greater than the power-down voltage of the microcontroller 150.
  • the connection between the mute control terminal /SD and the microcontroller 150 can be disconnected by the mute control circuit 130 before the microcontroller 150 is powered down, and the pull-down resistor R0 will The mute control terminal/SD is pulled down to a low level, which can effectively prevent the audio output circuit 100 from appearing at the moment of power failure, thereby improving the product quality and user experience of the audio device.
  • an audio device 200 including an audio power amplifier 210, a mute control circuit 230, a microcontroller 250, a power source 270, and a speaker 290.
  • the audio power amplifier 210 includes a power source.
  • the input terminal VCC, the mute control terminal/SD and the audio signal output terminal Out, the power input terminal VCC is connected to the power source 270 to obtain a power supply voltage, and the mute control terminal/SD passes through the mute control circuit 230 and the
  • the microcontroller 250 is connected and grounded through a pull-down resistor R0.
  • the audio signal output terminal Out is connected to the speaker 290 for outputting an audio signal
  • the mute control circuit 230 is also connected to the power source 270 for Turning on the connection between the mute control terminal /SD and the microcontroller 250 when the power supply voltage is greater than or equal to the preset voltage, and disconnecting the power supply voltage when the power supply voltage is less than a preset voltage
  • the connection between the mute control terminal/SD and the microcontroller 250 is connected to the speaker 290 for outputting an audio signal
  • the mute control circuit 230 is also connected to the power source 270 for Turning on the connection between the mute control terminal /SD and the microcontroller 250 when the power supply voltage is greater than or equal to the preset voltage, and disconnecting the power supply voltage when the power supply voltage is less than a preset voltage
  • the structure and function of the mute control circuit 230 are the same as those of the mute control circuit 130 in the embodiment shown in FIG. 3 to FIG. 4 .
  • the audio device 200 can be, but is not limited to, an audio device, a liquid crystal television, or the like.
  • the audio output circuit 100 sets the mute control circuit 130 between the mute control terminal /SD of the audio power amplifier 110 and the microcontroller 150, and the mute control circuit 130 and the audio power
  • the power supply of the amplifier 110 is connected, and when the power voltage of the audio power amplifier 110 is greater than or equal to a preset voltage, and the microcontroller 150 outputs a high level, the mute control terminal/SD and the micro control are turned on.
  • a connection between the devices 150 and when the power voltage of the audio power amplifier is greater than or equal to a preset voltage, and the microcontroller 150 outputs a low level, disconnecting the mute control terminal /SD and the micro control a connection between the devices 150 to ensure that the audio power amplifier 110 can operate normally under the control of the microcontroller 150 or stop outputting an audio signal, and when the power supply voltage is less than a preset voltage, disconnect the a connection between the mute control terminal /SD and the microcontroller 150 such that the level of the mute control terminal /SD is pulled down to a low level by the pull-down resistor R0, thereby controlling the Audio power amplifier output audio signal 110 stops, can effectively prevent audio device instantly generate POP tone in power, it is conducive to enhancing the audio device product quality and user experience.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Amplifiers (AREA)

Abstract

一种音频输出电路（100），包括音频功率放大器（110）、静音控制电路（130）和微控制器（150），该音频功率放大器（110）包括电源输入端（VCC）、静音控制端（/SD）及音频信号输出端（Out），该电源输入端（VCC）用于连接电源（AMP_VCC）以获取电源电压，该静音控制端（/SD）通过该静音控制电路（130）与该微控制器（150）连接，并通过下拉电阻（R0）接地，该音频信号输出端（Out）用于输出音频信号，该静音控制电路（130）还与该电源（AMP_VCC）连接，用于在该电源电压小于预设电压时，断开该静音控制端（/SD）与该微控制器（150）之间的连接。还提供一种音频设备。该电路可以有效防止音频设备的扬声器出现POP音。

Description

一种音频输出电路及音频设备
本发明要求2017年1月22日递交的发明名称为“一种音频输出电路及音频设备”的申请号(201710045579.7)的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及音频设备技术领域，尤其涉及一种音频输出电路及应用所述音频输出电路的音频设备。
背景技术
音频设备在上电、断电瞬间以及上电稳定后，可能存在各种瞬态噪声被输入到音频功率放大器，经音频功率放大器放大后由扬声器输出，从而造成POP(爆破)音，严重影响音频设备的产品品质和用户体验。一般地，音频设备的音频输出电路的结构如图1所示。其中，SP_Mute为静音控制信号，可以由音频设备的主控芯片提供，AMP VCC为音频功率放大器的电源电压，SP_Out为输出至扬声器的音频信号，R11、R12为电阻。目前，对于音频设备上电时的POP音，可以通过音频设备的主控芯片控制音频功率放大器的电源时序及静音控制时序来避免。然而，对于音频设备断电瞬间，由于断电瞬间音频设备的主控芯片掉电而无法控制音频功率放大器的电源时序及静音控制时序，加上硬件电路设计不合理，可能会导致断电瞬间产生POP音。现有技术中音频设备的音频输出电路的控制时序及输出波形示意图如图2所示。其中，曲线S1为静音控制信号SP_Mute的波形，曲线S2为AMP VCC的波形，曲线S3为SP_Out的波形。从图2中可以看出，音频设备在断电之后，电源电压AMP VCC会逐渐下降，在AMP VCC的下降到一定值时，主控芯片断电，静音控制信号SP_Mute因延迟而仍然保持一段时间的高电平，即音频功率放大器仍然处于工作状态，则会将主控芯片断电瞬间产生的瞬态脉冲放大并输出给扬声器，从而导致POP音的产生。
发明内容
本发明提供一种音频输出电路及音频设备，以实现音频设备断电瞬间的静音控制，防止POP音的产生，提升音频设备的产品品质和用户体验。
一种音频输出电路，包括音频功率放大器、静音控制电路和微控制器，所述音频功率放大器包括电源输入端、静音控制端及音频信号输出端，所述电源输入端用于连接电源以获取电源电压，所述静音控制端通过所述静音控制电路与所述微控制器连接，并通过下拉电阻接地，所述音频信号输出端用于输出音频信号，所述静音控制电路还与所述电源连接，用于在所述电源电压小于预设电压时，断开所述静音控制端与所述微控制器之间的连接。
其中，所述静音控制电路还用于在所述电源电压大于或等于预设电压时，导通所述静音控制端与所述微控制器之间的连接。
其中，所述静音控制电路包括稳压二极管、第一开关管、第二开关管、第一电阻、第二电阻、第三电阻、第四电阻及第五电阻，所述稳压二极管的负极与所述电源连接，所述稳压二极管的正极通过所述第一电阻与所述第一开关管的基极连接，所述第一开关管的基极还通过所述第二电阻接地，所述第一开关管的发射极接地，所述第一开关管的集电极通过所述第三电阻与所述第二开关管的基极连接，所述第二开关管的基极还通过所述第四电阻与所述第二开关管的发射极连接，所述第二开关管的发射极还通过所述第五电阻与所述微控制器连接，所述第二开关管的集电极与所述静音控制端连接。
其中，若所述电源电压大于或等于所述预设电压，则所述稳压二极管工作于反向击穿状态，所述第一开关管导通；若所述微控制器输出高电平，则所述第二开关管导通，所述静音控制端与所述微控制器之间的连接被导通，所述音频功率放大器正常工作；若所述微控制器输出低电平，则所述第二开关管截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电平，所述音频功率放大器停止输出音频信号。
其中，若所述电源电压小于所述预设电压，则所述稳压二极管工作于反向截止状态，所述第一开关管和所述第二开关管均截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电平，以控制所述音频功率放大器停止输出音频信号。
其中，所述预设电压大于或等于所述稳压二极管的稳定电压。
一种音频设备，包括音频功率放大器、静音控制电路、微控制器、电源及扬声器，所述音频功率放大器包括电源输入端、静音控制端及音频信号输出端，所述电源输入端与所述电源连接，以获取电源电压，所述静音控制端通过所述静音控制电路与所述微控制器连接，并通过下拉电阻接地，所述音频信号输出端与所述扬声器连接，用于输出音频信号，所述静音控制电路还与所述电源连接，用于在所述电源电压小于预设电压时，断开所述静音控制端与所述微控制器之间的连接。
其中，所述静音控制电路还用于在所述电源电压大于或等于预设电压时，导通所述静音控制端与所述微控制器之间的连接。
其中，所述静音控制电路包括稳压二极管、第一开关管、第二开关管、第一电阻、第二电阻、第三电阻、第四电阻及第五电阻，所述稳压二极管的负极与所述电源连接，所述稳压二极管的正极通过所述第一电阻与所述第一开关管的基极连接，所述第一开关管的基极还通过所述第二电阻接地，所述第一开关管的发射极接地，所述第一开关管的集电极通过所述第三电阻与所述第二开关管的基极连接，所述第二开关管的基极还通过所述第四电阻与所述第二开关管的发射极连接，所述第二开关管的发射极还通过所述第五电阻与所述微控制器连接，所述第二开关管的集电极与所述静音控制端连接。
其中，若所述电源电压大于或等于所述预设电压，则所述稳压二极管工作于反向击穿状态，所述第一开关管导通；若所述微控制器输出高电平，则所述第二开关管导通，所述静音控制端与所述微控制器之间的连接被导通，所述音频功率放大器正常工作；若所述微控制器输出低电平，则所述第二开关管截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电平，所述音频功率放大器停止输出音频信号。
其中，若所述电源电压小于所述预设电压，则所述稳压二极管工作于反向截止状态，所述第一开关管和所述第二开关管均截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电平，以控制所述音频功率放大器停止输出音频信号。
其中，所述预设电压大于或等于所述稳压二极管的稳定电压。
本发明的音频输出电路通过在音频功率放大器的静音控制端与微控制器 之间设置静音控制电路，并将静音控制电路与音频功率放大器的电源连接，进而在所述电源电压小于预设电压时，静音控制电路断开所述静音控制端与所述微控制器之间的连接，从而使得所述静音控制端的电平在所述下拉电阻的作用下被下拉为低电平，从而控制所述音频功率放大器停止输出音频信号，可以有效防止音频设备在断电瞬间产生POP音，有利于提升音频设备的产品品质和用户体验。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术中音频设备的音频输出电路的结构示意图；
图2是现有技术中音频设备的音频输出电路的控制时序及输出波形示意图；
图3是本发明实施例提供的音频输出电路的结构示意图；
图4是本发明实施例提供的音频输出电路的控制时序及输出波形示意图；
图5是本发明实施例提供的音频设备的结构示意图。
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做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。
为便于描述，这里可以使用诸如“在…之下”、“在…下面”、“下”、“在…之上”、“上”等空间相对性术语来描述如图中所示的一个元件或特征与另一个(些)元件或特征的关系。可以理解，当一个元件或层被称为在另一元件或层“上”、“连接到”或“耦接到”另一元件或层时，它可以直接在另一元件或层上、直接连接到或耦接到另一元件或层，或者可以存在居间元件或层。相反， 当一个元件被称为“直接在”另一元件或层上、“直接连接到”或“直接耦接到”另一元件或层时，不存在居间元件或层。
可以理解，这里所用的术语仅是为了描述特定实施例，并非要限制本发明。在这里使用时，除非上下文另有明确表述，否则单数形式“一”和“该”也旨在包括复数形式。进一步地，当在本说明书中使用时，术语“包括”和/或“包含”表明所述特征、整体、步骤、操作、元件和/或组件的存在，但不排除一个或多个其他特征、整体、步骤、操作、元件、组件和/或其组合的存在或增加。
除非另行定义，这里使用的所有术语(包括技术术语和科学术语)都具有本发明所属领域内的普通技术人员所通常理解的相同含义。将进一步理解，诸如通用词典中所定义的术语，否则应当被解释为具有与它们在相关领域的语境中的含义相一致的含义，而不应被解释为理想化或过度形式化的意义，除非在此明确地如此定义。
请参阅图3，在本发明一个实施例中，提供一种音频输出电路100，包括音频功率放大器110、静音控制电路130和微控制器150，所述音频功率放大器110包括电源输入端VCC、静音控制端/SD及音频信号输出端Out，所述电源输入端VCC用于连接电源AMP_VCC以获取电源电压，所述静音控制端/SD通过所述静音控制电路130与所述微控制器150连接，并通过下拉电阻R0接地，所述音频信号输出端Out用于输出音频信号，所述静音控制电路130还与所述电源AMP_VCC连接，用于在所述电源电压大于或等于预设电压时，导通所述静音控制端/SD与所述微控制器150之间的连接，并在所述电源电压小于预设电压时，断开所述静音控制端/SD与所述微控制器150之间的连接。
可以理解，在所述电源AMP_VCC正常工作时，电源电压始终大于所述预设电压，所述静音控制电路130导通所述静音控制端/SD与所述微控制器150之间的连接，所述静音控制电路130根据所述微控制器150输出电平的高、低，向音频功率放大器110的静音控制器端/SD输出相应的电平信号，具体的，当所述微控制器150输出高电平时，所述静音控制电路130向音频功率放大器110的静音控制器端/SD输出高电平，当所述微控制器150输出低电平时，所述静音控制电路130向音频功率放大器110的静音控制器端/SD输出低电平。 所述音频功率放大器110在静音控制器端/SD为高电平时，工作模式切换为正常工作模式，在静音控制器端/SD为低电平时，工作模式切换为静音模式。所述音频功率放大器110在正常工作模式时，当有音频信号输入时，所述音频功率放大器110将该音频信号进行放大并从所述音频信号输出端Out输出给扬声器；所述音频功率放大器110在静音模式时，所述音频功率放大器110不会有音频信号输出，扬声器被静音。
在音频输出电路100对应的音频设备断电的瞬间，由于所述微控制器110在掉电状态下无法立即控制所述静音控制端/SD的电平变为低电平，即所述静音控制端/SD的电平由高电平切换为低电平之间存在一定的延迟时间段。同时，由于所述电源AMP_VCC输出的电源电压在音频设备断电后是逐渐下降的，但在下降到一定的电压之前，若所述音频输出电路100中存在噪声信号(例如微控制器150断电时生成的噪声信号)，且静音控制端/SD为高电平，则该噪声信号会被所述音频功率放大器110放大而输出给扬声器，从而形成POP音，即爆破音。在本实施例中，为避免所述音频输出电路100在音频设备断电的瞬间出现POP音，通过所述静音控制电路130来监测所述电源AMP_VCC输出的电源电压，并在所述电源电压小于预设电压时，断开所述静音控制端/SD与所述微控制器150之间的连接，从而使得所述静音控制端/SD在所述下拉电阻R0的下拉作用下被锁定在低电平，即所述音频功率放大器110不会有音频信号输出，扬声器被静音。
在本实施例中，所述静音控制电路130包括稳压二极管D、第一开关管Q1、第二开关管Q2、第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4及第五电阻R5，所述稳压二极管D的负极与所述电源AMP_VCC连接，所述稳压二极管D的正极通过所述第一电阻R1与所述第一开关管Q1的基极b连接，所述第一开关管Q1的基极b还通过所述第二电阻R2接地，所述第一开关管Q1的发射极e接地，所述第一开关管Q1的集电极c通过所述第三电阻R3与所述第二开关管Q2的基极b连接，所述第二开关管Q2的基极b还通过所述第四电阻R4与所述第二开关管Q2的发射极e连接，所述第二开关管Q2的发射极e还通过所述第五电阻R5与所述微控制器150连接，所述第二开关管Q2的集电极c与所述静音控制端/SD连接。
在一种实施方式中，若所述电源电压大于或等于所述预设电压，则所述稳压二极管D工作于反向击穿状态，从而在所述第一开关管Q1的基极b与发射极e之间形成正向偏压，所述第一开关管Q1导通，所述第二开关管Q2的基极b的电平被拉低。此时，若所述微控制器150输出高电平，则在所述第二开关管Q2的基极b与发射极e之间形成反向偏压，所述第二开关管Q2导通，进而使得所述静音控制端/SD与所述微控制器150之间的连接被导通，所述第二开关管Q2的集电极c为高电平，即所述静音控制端/SD为高电平，以控制所述音频功率放大器110切换为正常工作模式。若所述微控制器150输出低电平，则所述第二开关管Q2的基极b与发射极e均为低电平，所述第二开关管Q2截止，进而使得所述静音控制端/SD与所述微控制器150之间的连接被断开，所述静音控制端/SD的电平在所述下拉电阻R0的作用下变为低电平，以控制所述音频功率放大器110切换为静音模式，停止输出音频信号。
在一种实施方式中，若所述电源电压小于所述预设电压，则所述稳压二极D管工作于反向截止状态，所述第一开关管Q1和所述第二开关管Q2均截止，所述静音控制端/SD与所述微控制器150之间的连接被断开，所述静音控制端/SD的电平在所述下拉电阻R0的作用下变为低电平，以控制所述音频功率放大器110切换为静音模式，停止输出音频信号。
可以理解，所述预设电压大于或等于所述稳压二极管D的稳定电压。在本实施例中，所述电源AMP_VCC正常工作时，输出的电源电压为13V，所述稳压二极管D的稳定电压为9.1V，即反向击穿电压为9.1V。当所述电源AMP_VCC正常工作时，所述稳压二极管D工作于反向击穿状态，在所述第一开关管Q1的基极b与发射极e之间形成正向偏压，从而使得所述第一开关管Q1导通，进一步地，第一开关管Q1的导通使得所述第二开关管Q2的基极b的电平被拉低，此时，若所述微控制器150输出高电平，则在所述第二开关管Q2的基极b与发射极e之间形成反向偏压，从而第二开关管Q2也导通，所述静音控制端/SD与所述微控制器150之间的连接被导通。当所述音频输出电路100对应的音频设备断电后，所述电源AMP_VCC输出的电源电压会逐渐下降，当该电源电压下降到9.1V时，所述稳压二极管D工作于反向截止状态，所述第一开关管Q1和所述第二开关管Q2均截止，所述静音控制端/SD 与所述微控制器150之间的连接被断开，所述静音控制端/SD被下拉为低电平，从而控制所述音频功率放大器110切换为静音模式，停止输出音频信号。
请参阅图4，为本发明实施例提供的音频输出电路100的控制时序及输出波形示意图，其中，曲线S11为所述静音控制端/SD的电平值变化波形，S12为所述电源AMP_VCC输出的电源电压的波形，Vt为预设电压(本实施例中为9.1V)，S13为所述音频功率放大器110输出的音频信号SP_Out的波形。从图4中可以看出，当电源电压S12下降到小于预设电压Vt时，所述静音控制端/SD的电平由高电平下降为低电平，从而控制所述音频功率放大器110停止输出音频信号。可以理解，所述预设电压Vt的大小可以根据不同的电路应用需求来选择不同规格的稳压二极管来调节，只需保证所述预设电压Vt大于所述微控制器150的掉电电压，从而可以在所述微控制器150掉电之前通过所述静音控制电路130断开所述静音控制端/SD与所述微控制器150之间的连接，并由所述下拉电阻R0将所述静音控制端/SD下拉为低电平，可以有效防止所述音频输出电路100在断电瞬间出现POP音，从而提升音频设备的产品品质及用户体验。
请参阅图5，在本发明一个实施例中，提供一种音频设备200，包括音频功率放大器210、静音控制电路230、微控制器250、电源270及扬声器290，所述音频功率放大器210包括电源输入端VCC、静音控制端/SD及音频信号输出端Out，所述电源输入端VCC与所述电源270连接，以获取电源电压，所述静音控制端/SD通过所述静音控制电路230与所述微控制器250连接，并通过下拉电阻R0接地，所述音频信号输出端Out与所述扬声器290连接，用于输出音频信号，所述静音控制电路230还与所述电源270连接，用于在所述电源电压大于或等于预设电压时，导通所述静音控制端/SD与所述微控制器250之间的连接，并在所述电源电压小于预设电压时，断开所述静音控制端/SD与所述微控制器250之间的连接。
其中，所述静音控制电路230的结构及功能与图3至图4所示实施例中的静音控制电路130相同，具体可以参照图3至图4所示实施例中的相关描述，此处不再赘述。可以理解，所述音频设备200可以是但不限于音响设备、液晶电视等。
所述音频输出电路100通过在所述音频功率放大器110的静音控制端/SD与所述微控制器150之间设置所述静音控制电路130，并将所述静音控制电路130与所述音频功率放大器110的电源连接，进而在所述音频功率放大器110的电源电压大于或等于预设电压、且所述微控制器150输出高电平时，导通所述静音控制端/SD与所述微控制器150之间的连接，并在所述音频功率放大器的电源电压大于或等于预设电压、且所述微控制器150输出低电平时，断开所述静音控制端/SD与所述微控制器150之间的连接，以保证所述音频功率放大器110可以在所述微控制器150的控制下正常工作或者停止输出音频信号，并在所述电源电压小于预设电压时，断开所述静音控制端/SD与所述微控制器150之间的连接，从而使得所述静音控制端/SD的电平在所述下拉电阻R0的作用下被下拉为低电平，从而控制所述音频功率放大器110停止输出音频信号，可以有效防止音频设备在断电瞬间产生POP音，有利于提升音频设备的产品品质和用户体验。
可以理解，以上所揭露的仅为本发明的较佳实施例而已，当然不能以此来限定本发明的权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (12)

  1. 一种音频输出电路，包括音频功率放大器、静音控制电路和微控制器，所述音频功率放大器包括电源输入端、静音控制端及音频信号输出端，所述电源输入端用于连接电源以获取电源电压，所述静音控制端通过所述静音控制电路与所述微控制器连接，并通过下拉电阻接地，所述音频信号输出端用于输出音频信号，所述静音控制电路还与所述电源连接，用于在所述电源电压小于预设电压时，断开所述静音控制端与所述微控制器之间的连接。
  2. 如权利要求1所述的音频输出电路，其中，所述静音控制电路还用于在所述电源电压大于或等于预设电压时，导通所述静音控制端与所述微控制器之间的连接。
  3. 如权利要求1所述的音频输出电路，其中，所述静音控制电路包括稳压二极管、第一开关管、第二开关管、第一电阻、第二电阻、第三电阻、第四电阻及第五电阻，所述稳压二极管的负极与所述电源连接，所述稳压二极管的正极通过所述第一电阻与所述第一开关管的基极连接，所述第一开关管的基极还通过所述第二电阻接地，所述第一开关管的发射极接地，所述第一开关管的集电极通过所述第三电阻与所述第二开关管的基极连接，所述第二开关管的基极还通过所述第四电阻与所述第二开关管的发射极连接，所述第二开关管的发射极还通过所述第五电阻与所述微控制器连接，所述第二开关管的集电极与所述静音控制端连接。
  4. 如权利要求3所述的音频输出电路，其中，若所述电源电压大于或等于所述预设电压，则所述稳压二极管工作于反向击穿状态，所述第一开关管导通；若所述微控制器输出高电平，则所述第二开关管导通，所述静音控制端与所述微控制器之间的连接被导通，所述音频功率放大器正常工作；若所述微控制器输出低电平，则所述第二开关管截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电 平，所述音频功率放大器停止输出音频信号。
  5. 如权利要求3所述的音频输出电路，其中，若所述电源电压小于所述预设电压，则所述稳压二极管工作于反向截止状态，所述第一开关管和所述第二开关管均截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电平，以控制所述音频功率放大器停止输出音频信号。
  6. 如权利要求3所述的音频输出电路，其中，所述预设电压大于或等于所述稳压二极管的稳定电压。
  7. 一种音频设备，包括音频功率放大器、静音控制电路、微控制器、电源及扬声器，所述音频功率放大器包括电源输入端、静音控制端及音频信号输出端，所述电源输入端与所述电源连接，以获取电源电压，所述静音控制端通过所述静音控制电路与所述微控制器连接，并通过下拉电阻接地，所述音频信号输出端与所述扬声器连接，用于输出音频信号，所述静音控制电路还与所述电源连接，用于在所述电源电压小于预设电压时，断开所述静音控制端与所述微控制器之间的连接。
  8. 如权利要求7所述的音频设备，其中，所述静音控制电路还用于在所述电源电压大于或等于预设电压时，导通所述静音控制端与所述微控制器之间的连接。
  9. 如权利要求7所述的音频设备，其中，所述静音控制电路包括稳压二极管、第一开关管、第二开关管、第一电阻、第二电阻、第三电阻、第四电阻及第五电阻，所述稳压二极管的负极与所述电源连接，所述稳压二极管的正极通过所述第一电阻与所述第一开关管的基极连接，所述第一开关管的基极还通过所述第二电阻接地，所述第一开关管的发射极接地，所述第一开关管的集电极通过所述第三电阻与所述第二开关管的基极连接，所述第二开关管的基极还 通过所述第四电阻与所述第二开关管的发射极连接，所述第二开关管的发射极还通过所述第五电阻与所述微控制器连接，所述第二开关管的集电极与所述静音控制端连接。
  10. 如权利要求9所述的音频设备，其中，若所述电源电压大于或等于所述预设电压，则所述稳压二极管工作于反向击穿状态，所述第一开关管导通；若所述微控制器输出高电平，则所述第二开关管导通，所述静音控制端与所述微控制器之间的连接被导通，所述音频功率放大器正常工作；若所述微控制器输出低电平，则所述第二开关管截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电平，所述音频功率放大器停止输出音频信号。
  11. 如权利要求9所述的音频设备，其中，若所述电源电压小于所述预设电压，则所述稳压二极管工作于反向截止状态，所述第一开关管和所述第二开关管均截止，所述静音控制端与所述微控制器之间的连接被断开，所述静音控制端的电平在所述下拉电阻的作用下变为低电平，以控制所述音频功率放大器停止输出音频信号。
  12. 如权利要求9所述的音频设备，其中，所述预设电压大于或等于所述稳压二极管的稳定电压。
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CN112763036B (zh) * 2020-12-23 2022-09-13 厦门巨林仪器有限公司 一种称重报警控制电路、设备及显示仪表

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