CN205693877U - Muting control circuit based on power supply power-fail detection - Google Patents
Muting control circuit based on power supply power-fail detection Download PDFInfo
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- CN205693877U CN205693877U CN201620570473.XU CN201620570473U CN205693877U CN 205693877 U CN205693877 U CN 205693877U CN 201620570473 U CN201620570473 U CN 201620570473U CN 205693877 U CN205693877 U CN 205693877U
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Abstract
This utility model relates to a kind of muting control circuit based on power supply power-fail detection.Including: power-fail detection circuit and muting control circuit；Described power-fail detection circuit includes the first audion, and the base stage of the first audion and the first power end connect, and the colelctor electrode of the first audion and second source end connect, the grounded emitter of the first audion；Described muting control circuit includes field effect transistor；Described fet gate and the first transistor collector connect, and field effect transistor drain electrode and the 3rd power end, quiet control end connect, field effect transistor source ground；When the voltage of the first power end drop to make the first transistor base voltage less than the conducting voltage of the first audion time, the first audion cut-off, field effect transistor turns on, and quiet control end becomes low level, it is achieved mute function.
Description
Technical field
This utility model relates to a kind of muting control circuit, a kind of muting control circuit based on detection of power loss.
Background technology
In a lot of application scenarios, we need the most quiet by designed circuit board.Existing muting control circuit is by leading
Chip directly controls the MUTE pin of power amplifier by I/O port output low and high level, changes power amplifier and LINE_ according to software set
OUT circuit is the most quiet.But, AC dump when system works when, when the supply voltage of master chip drops to certain value,
The voltage of master chip audio output signal correspondence pin can drop into 0V.Owing to master chip can not fall reality according to supply voltage
Time control the MUTE pin level of power amplifier, the sudden change of power amplifier input signal eventually results in loudspeaker can send more significantly explosion
Sound, it is impossible to realize quiet.
Utility model content
In order to realize quiet control during power supply power-fail, this utility model provides a kind of based on power supply power-fail detection quiet
Control circuit.
This utility model be the technical scheme is that a kind of muting control circuit based on power supply power-fail detection, its bag
Include power-fail detection circuit and muting control circuit；Described power-fail detection circuit includes the first audion, the base stage of the first audion
Connecting with the first power end, the colelctor electrode of the first audion and second source end connect, the grounded emitter of the first audion；
Described muting control circuit includes field effect transistor；The grid of described field effect transistor Q1 and the current collection of the first audion
Pole connects, and the drain electrode of field effect transistor and the 3rd power end, quiet control end connect, the source ground of field effect transistor；
When the voltage of the first power end drops to the base voltage making the first audion less than the electric conduction of the first audion
During pressure, the first audion cut-off, field effect transistor turns on, and quiet control end becomes low level, it is achieved mute function.
Wherein, described power-fail detection circuit also includes the first resistance and Zener diode；The base stage of described first audion
Through the positive pole connection of the first resistance and Zener diode, the negative pole of Zener diode and the first power end connect.Above-mentioned voltage stabilizing two
Pole pipe can select different voltage stabilizing values, needs to change the stabilivolt just adjustable threshold values of different voltage stabilizing value according to different circuit
Voltage.
Wherein, the positive pole of described Zener diode is also through the second resistance eutral grounding.
Wherein, the colelctor electrode of described first audion connects through the negative pole of the 3rd resistance and diode, the positive pole of diode
Connect with second source end.
Wherein, the negative pole of described diode is also through the first capacity earth.
Wherein, one end of described 4th resistance and the colelctor electrode of the first audion connect, the other end of described 4th resistance
Connect with the 5th resistance, the second electric capacity, the other end of the 5th resistance and the equal ground connection of the other end of the second electric capacity.
Wherein, the drain electrode of described field effect transistor connects through the 6th resistance and the 3rd power end.
Wherein, the base stage of described second audion connects through the 7th resistance and MUTE_CTL end, the current collection of the second audion
Pole and DAMP_MUTE end connect, and the most also drain electrode through the 8th resistance and field effect transistor connects, and the emitter stage of the second audion connects
Ground；The base stage of described second audion is also through the 9th resistance eutral grounding；
The base stage of described 3rd audion connects through the tenth resistance and LINEOUT_CTL end, the colelctor electrode of the 3rd audion
Connecting with LINE_OUT_EN end, the most also drain electrode through the 11st resistance and field effect transistor connects, the emitter stage of the 3rd audion
Ground connection；The base stage of described 3rd audion is also through the 12nd resistance eutral grounding；
Wherein, DAMP_MUTE end, LINE_OUT_EN end are quiet control end, and DAMP_MUTE end connects built-in power amplifier,
LINE_OUT_EN end connects external power amplifier；MUTE_CTL end and LINEOUT_CTL end are software and control the input of mute signal
End, the signal inputted controls built-in power amplifier and external power amplifier respectively.
The beneficial effects of the utility model include: automatically control the quiet control of power amplifier in the range of supply voltage drops into setting
End processed becomes low level, is achieved in silence processing, does not has plosive.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the muting control circuit based on power supply power-fail detection of this utility model one embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model embodiment is described further:
As it is shown in figure 1, a kind of muting control circuit based on power supply power-fail detection, it includes power-fail detection circuit and quiet
Control circuit；Described power-fail detection circuit includes audion Q2 (the i.e. first audion), the base stage of audion Q2 and the first power supply
End (i.e.+22V_SB end in Fig. 1) connects, and the colelctor electrode of audion Q2 and second source end (i.e.+5VSB end in Fig. 1) are even
Connect, the grounded emitter of audion Q2；Described muting control circuit includes field effect transistor Q1；The grid of described field effect transistor Q1
Connect with the colelctor electrode of audion Q2, the drain electrode of field effect transistor Q1 and the 3rd power end (i.e.+3.3V end in Fig. 1), DAMP_
(DAMP_MUTE end, LINE_OUT_EN end are quiet control end, wherein, DAMP_MUTE end for MUTE end, LINE_OUT_EN end
Connecting built-in power amplifier, LINE_OUT_EN end connects external power amplifier) connect, the source ground of field effect transistor Q1；
The muting control circuit based on power supply power-fail detection of the present embodiment, when the base of the audion Q2 of power-fail detection circuit
When pole tension is more than or equal to the conducting voltage of audion Q2, audion Q2 turns on, and field effect transistor Q1 is ended, DAMP_MUTE end and
LINE_OUT_EN end is high level；When the base voltage of the audion Q2 of power-fail detection circuit is less than the electric conduction of audion Q2
During pressure, audion Q2 ends, and field effect transistor Q1 turns on, and DAMP_MUTE end and LINE_OUT_EN end are low level, thus real
Existing quiet control.
Such as, the conducting voltage of audion Q2 is 0.7V, when the base voltage of the audion Q2 of power-fail detection circuit is more than
During equal to 0.7V, DAMP_MUTE end, LINE_OUT_EN rectify often work.Base stage electricity as the audion Q2 of power-fail detection circuit
When pressure is less than 0.7V, DAMP_MUTE end and LINE_OUT_EN end low level, it is achieved mute function.
As a preferred implementation, as it is shown in figure 1, the base stage of described audion Q2 is through resistance R15 (the i.e. first resistance)
Connecting with the positive pole of Zener diode D3, the negative pole of Zener diode D3 and the first power end+22V_SB connect.Detection of power loss electricity
The threshold voltage on road is about voltage stabilizing value V of Zener diode D3D3With the cut-in voltage of audion Q2 and, i.e. A point voltage V ≈
VD3+0.7.Thus, according to the stabilivolt of the replaceable different voltage stabilizing values of different circuit to adjust threshold voltage.
As a preferred implementation, as it is shown in figure 1, the positive pole of described Zener diode D3 is also through resistance R21 (i.e. second
Resistance) ground connection, the safety of protection Zener diode D3.
As a preferred implementation, as it is shown in figure 1, the colelctor electrode of described audion Q2 is through resistance R13 (the i.e. the 3rd electricity
Resistance) and the negative pole connection of diode D1, the positive pole of diode D1 and second source end+5VSB connect, it is ensured that and second source end+
The unidirectional general character of electric current of 5VSB.
As it is shown in figure 1, the negative pole of described diode D1 is also through electric capacity C11 (the i.e. first electric capacity) ground connection.Protection diode D1
Safety.
As a preferred implementation, as it is shown in figure 1, described muting control circuit also includes resistance R14 (the i.e. the 4th electricity
Resistance), R16 (the i.e. the 5th resistance) and electric capacity CAI (the i.e. second electric capacity)；One end of described resistance R14 and the colelctor electrode of audion Q2
Connecting, the other end of described resistance R14 and resistance R16 one end, electric capacity CAI one end connect, the resistance R16 other end and electric capacity CAI
The other end all ground connection, by the high level ground connection in audion Q2 base stage, protection circuit.
As a preferred implementation, as it is shown in figure 1, the drain electrode of described field effect transistor Q1 is through resistance R4 (the i.e. the 6th resistance)
Connect with the 3rd power end+3.3V, field effect transistor Q1 is powered.
As a preferred implementation, as it is shown in figure 1, the base stage of described audion Q3 (the i.e. second audion) is through resistance
R19 (the i.e. the 7th resistance) and MUTE_CTL end connect, and the colelctor electrode of audion Q3 and DAMP_MUTE end connect, the most also through electricity
The drain electrode of resistance R7 (the i.e. the 8th resistance) and field effect transistor Q1 connects, the grounded emitter of audion Q3；The base of described audion Q3
Pole is also through resistance R22 (the i.e. the 9th resistance) ground connection.The base stage of described audion Q4 (the i.e. the 3rd audion) is through resistance R20 (i.e.
Ten resistance) and the connection of LINEOUT_CTL end, the colelctor electrode of audion Q4 and the connection of LINE_OUT_EN end, the most also through resistance R8
The drain electrode of (the i.e. the 11st resistance) and field effect transistor Q1 connects, the grounded emitter of audion Q4；The base stage of described audion Q4
Also through resistance R27 (the i.e. the 12nd resistance) ground connection.Wherein, what MUTE_CTL end and LINEOUT_CTL end were inputted is all software
Controlling quiet signal (the mute button signal as on remote controller), the signal inputted controls built-in power amplifier and external merit respectively
Put.
Muting control circuit based on detection of power loss based on above-described embodiment, wherein, power-fail detection circuit principle is as follows:
When A point voltage is more than the cut-in voltage 0.7V of Q2, then Q2 can turn on, thus B point is low level；When A point voltage is less than 0.7V, then
Q2 ends, and B point voltage is high level.A point voltage can regulate by changing the magnitude of voltage of stabilivolt D3.
Muting control circuit principle is: realizing quiet control by the level of detection B point, when B is high level, Q1 leads
Logical, C point is low level, DAMP_MUTE and LINE_OUT_EN all output low levels thus realize mute function.When B point is low electricity
Flat, Q2 ends, and C point is high level, DAMP_MUTE and LINE_OUT_EN exports high level, power amplifier and LINE_OUT can be normal
Work.
Embodiment described above only have expressed several embodiments of the present utility model, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that, for the common skill of this area
For art personnel, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into
Protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be as the criterion with claims.
Claims (8)
1. a muting control circuit based on power supply power-fail detection, it is characterised in that including: power-fail detection circuit and quiet control
Circuit processed；Described power-fail detection circuit includes the first audion, and the base stage of the first audion and the first power end connect, the one or three
The colelctor electrode of pole pipe and second source end connect, the grounded emitter of the first audion；
Described muting control circuit includes field effect transistor；The grid of described field effect transistor and the colelctor electrode of the first audion are even
Connecing, the drain electrode of field effect transistor and the 3rd power end, quiet control end connect, the source ground of field effect transistor；
When the voltage of the first power end drops to the base voltage the making described first audion electric conduction less than the first audion
During pressure, the first audion cut-off, field effect transistor turns on, and quiet control end becomes low level, it is achieved mute function.
Muting control circuit based on power supply power-fail detection the most according to claim 1, it is characterised in that described power down is examined
Slowdown monitoring circuit also includes the first resistance and Zener diode；The base stage of described first audion is through the first resistance and Zener diode
Positive pole connects, and negative pole and described first power end of Zener diode connect.
Muting control circuit based on power supply power-fail detection the most according to claim 2, it is characterised in that also include second
Resistance；The positive pole of described Zener diode is also through the second resistance eutral grounding.
Muting control circuit based on power supply power-fail detection the most according to claim 1, it is characterised in that described power down is examined
Slowdown monitoring circuit also includes the 3rd resistance and diode；The colelctor electrode of described first audion connects through the negative pole of the 3rd resistance with diode
Connecing, the positive pole of diode and described second source end connect.
Muting control circuit based on power supply power-fail detection the most according to claim 4, it is characterised in that also include first
Electric capacity；The negative pole of described diode is also through the first capacity earth.
Muting control circuit based on power supply power-fail detection the most according to claim 1, it is characterised in that described power down is examined
Slowdown monitoring circuit also includes the 4th resistance, the 5th resistance and the second electric capacity；One end of described 4th resistance and the current collection of the first audion
Pole connects, and the other end of described 4th resistance and the 5th resistance one end, second electric capacity one end connect, the 5th resistance other end and the
The two equal ground connection of the electric capacity other end.
A kind of muting control circuit based on power supply power-fail detection the most according to claim 1, it is characterised in that described quiet
Sound control circuit also includes that the 6th resistance, the drain electrode of described field effect transistor are connected with described 3rd power end through the 6th resistance.
A kind of muting control circuit based on power supply power-fail detection the most according to claim 1, it is characterised in that described quiet
Sound control circuit also include the second audion, the 3rd audion, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance,
11 resistance and the 12nd resistance；The base stage of described second audion is connected with MUTE_CTL end through the 7th resistance, the two or three pole
The colelctor electrode of pipe is connected with DAMP_MUTE end, and the colelctor electrode of the second audion is also through the drain electrode company of the 8th resistance and field effect transistor
Connect, the grounded emitter of the second audion；The base stage of described second audion is also through the 9th resistance eutral grounding；
The base stage of described 3rd audion is connected with LINEOUT_CTL end through the tenth resistance, the colelctor electrode of the 3rd audion with
LINE_OUT_EN end connects, and the colelctor electrode of the 3rd audion is also connected with the drain electrode of field effect transistor through the 11st resistance, and the three or three
The grounded emitter of pole pipe；The base stage of described 3rd audion is also through the 12nd resistance eutral grounding；
Wherein, DAMP_MUTE end, LINE_OUT_EN end are quiet control end, and DAMP_MUTE end connects built-in power amplifier,
LINE_OUT_EN end connects external power amplifier；MUTE_CTL end and LINEOUT_CTL end are software and control the input of mute signal
End, the signal inputted controls built-in power amplifier and external power amplifier respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620570473.XU CN205693877U (en) | 2016-06-13 | 2016-06-13 | Muting control circuit based on power supply power-fail detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620570473.XU CN205693877U (en) | 2016-06-13 | 2016-06-13 | Muting control circuit based on power supply power-fail detection |
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| Publication Number | Publication Date |
|---|---|
| CN205693877U true CN205693877U (en) | 2016-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620570473.XU Active CN205693877U (en) | 2016-06-13 | 2016-06-13 | Muting control circuit based on power supply power-fail detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018133155A1 (en) * | 2017-01-22 | 2018-07-26 | 深圳市华星光电技术有限公司 | Audio output circuit, and audio apparatus |
| CN110045177A (en) * | 2019-04-23 | 2019-07-23 | 深圳市博实结科技有限公司 | Power-down state detection method and power-down state detection system |
| CN116112846A (en) * | 2022-10-08 | 2023-05-12 | 广州市保伦电子有限公司 | Restarting impact sound eliminating circuit and audio circuit |
-
2016
- 2016-06-13 CN CN201620570473.XU patent/CN205693877U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018133155A1 (en) * | 2017-01-22 | 2018-07-26 | 深圳市华星光电技术有限公司 | Audio output circuit, and audio apparatus |
| US10224889B2 (en) | 2017-01-22 | 2019-03-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Audio output circuit and audio device |
| CN110045177A (en) * | 2019-04-23 | 2019-07-23 | 深圳市博实结科技有限公司 | Power-down state detection method and power-down state detection system |
| CN110045177B (en) * | 2019-04-23 | 2021-03-30 | 深圳市博实结科技有限公司 | Power failure state detection method and power failure state detection system |
| CN116112846A (en) * | 2022-10-08 | 2023-05-12 | 广州市保伦电子有限公司 | Restarting impact sound eliminating circuit and audio circuit |
| CN116112846B (en) * | 2022-10-08 | 2024-01-30 | 广东保伦电子股份有限公司 | Restarting impact sound eliminating circuit and audio circuit |
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