CN102098011A - Circuit for rapidly controlling mute of audio power amplifier - Google Patents
Circuit for rapidly controlling mute of audio power amplifier Download PDFInfo
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- CN102098011A CN102098011A CN201010607628XA CN201010607628A CN102098011A CN 102098011 A CN102098011 A CN 102098011A CN 201010607628X A CN201010607628X A CN 201010607628XA CN 201010607628 A CN201010607628 A CN 201010607628A CN 102098011 A CN102098011 A CN 102098011A
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- triode
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- resistance
- power amplifier
- control circuit
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Abstract
The invention discloses a circuit for rapidly controlling mute of an audio power amplifier, which comprises an upper power-down mute circuit and a mute control circuit, wherein the upper power-down mute circuit is provided with a triode Q3 and a triode Q4; a base electrode of the triode Q3 is electrically connected with a resistor R1 and a resistor R2; the resistor R1 and an emitting electrode of the triode Q3 are electrically connected with a power supply and a capacitor EC1; the resistor R2 is electrically connected with a capacitor EC2 and a positive pole of a diode D2; a collector electrode of the triode Q3 is electrically connected with a base electrode of the triode Q4; a collector electrode of the triode Q4 is electrically connected with a signal output end P0; the mute control circuit is provided with a voltage-regulator tube D5 and a triode Q1 which are connected with each other in series; a base electrode of the triode Q1 is connected with a first signal input control end P1; and an emitting electrode of the triode Q1 is grounded. The circuit is rapid in mute control speed, less in impact for the power supply in the switching process, simple in structure and low in cost.
Description
Technical field
The present invention relates to a kind of quiet quick control circuit, especially relate to the quiet quick control circuit of a kind of audio-frequency power amplifier.
Background technology
Along with improving constantly of consumer spending level, people require also to improve constantly to the soften of sound accompaniment.When the sound equipment power or power-down, because the input signal noise that prime Audio Processing chip power or power down noise cause, and power amplifier chip itself is because the noise that power or power-down causes produces the unusual sound in loudspeaker, form on-off noise, had a strong impact on the complete machine quality of tv product, this just makes that the improvement of mute circuit is more and more important.Existing muting control circuit complex structure, quiet control have only two states, i.e. closed condition and opening, and switching time is long, and the controlled audio-frequency power amplifier of handoff procedure impacts frequent to power supply.Therefore, how to develop a kind of simple in structurely, quiet control rate is fast, and the controlled audio-frequency power amplifier of handoff procedure impacts little quiet quick control circuit to power supply and become the problem that needs to be resolved hurrily.
Summary of the invention
The defective that The present invention be directed to the existence of above-mentioned background technology provides a kind of simple in structure, and cost is low, and quiet control rate is fast, and the controlled audio-frequency power amplifier of handoff procedure impacts the little quiet quick control circuit of audio-frequency power amplifier to power supply.
For achieving the above object, the invention discloses the quiet quick control circuit of a kind of audio-frequency power amplifier, it comprises power down mute circuit and muting control circuit, the described power down mute circuit of going up is provided with triode Q3 and triode Q4, the base stage of described triode Q3 is electrically connected with an end of resistance R 1 and an end of resistance R 2, the emitter of described resistance R 1 and triode Q3 all is electrically connected to power supply and electric capacity EC1, described resistance R 2 is electrically connected with the anode of electric capacity EC2 and diode D2, the collector electrode of described triode Q3 is electrically connected with the base stage of described triode Q4, be electrically connected with resistance R 9 between the emitter of described triode Q4 and the base stage, the emitter of described triode Q4 is electrically connected to described power supply and diode D2, the collector electrode of described triode Q4 is electrically connected with resistance R 4, and described resistance R 4 is electrically connected with signal output part P0; Described muting control circuit is provided with the voltage-stabiliser tube D5 and the triode Q1 of mutual series connection, and the base stage of described triode Q1 is electrically connected to first signal input control end P1, the grounded emitter of described triode Q1.
Further, the emitter of described triode Q3 and electric capacity EC1 all are connected with the negative electrode of diode D1, and the anode of described diode D1 is electrically connected with power supply.
Further, be provided with diode D3 between the emitter of described power supply and described triode Q4.
Further, the base stage of described triode Q4 is electrically connected with resistance R 5, and an end of described resistance R 5 is electrically connected with the collector electrode of triode Q2, the grounded emitter of described triode Q2, the base stage of described triode Q2 is connected with resistance R 8, and described resistance R 8 is electrically connected with secondary signal input control end P2.
Further, the end of described electric capacity EC1 links to each other other end ground connection with the emitter of described triode Q3.
Further, the end of described electric capacity EC2 links to each other other end ground connection with described resistance R 2.
Further, be electrically connected with resistance R 6 between the collector electrode of described triode Q4 and the described resistance R 4, the other end ground connection of described resistance R 6.
Further, be provided with resistance R 7 between the base stage of described triode Q1 and described first signal input control end P1.
Further, be provided with diode D4 between the base stage of the collector electrode of described triode Q3 and described triode Q4.
Further, be electrically connected with an end of resistance R 3 between the collector electrode of described triode Q3 and the described diode D4, the other end of described resistance R 3 is electrically connected with secondary signal output P3.
In sum, the quiet quick control circuit of audio-frequency power amplifier of the present invention is by described cooperation of going up power down mute circuit and muting control circuit, thereby can realize that quiet control rate is fast, the controlled audio-frequency power amplifier of handoff procedure impacts little to power supply, in addition, this circuit structure is simple, and cost is low.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of the present invention.
Embodiment
For further understanding feature of the present invention, technological means and the specific purposes that reached, function, the present invention is described in further detail below in conjunction with accompanying drawing and embodiment.
See also Fig. 1, the quiet quick control circuit of audio-frequency power amplifier of the present invention comprises power down mute circuit 1 and muting control circuit 2, the described power down mute circuit 1 of going up is provided with triode Q3 and triode Q4, the base stage of described triode Q3 is electrically connected with an end of resistance R 1 and an end of resistance R 2, the emitter of described resistance R 1 and triode Q3 all is electrically connected with negative electrode and the electric capacity EC1 of diode D1, the anode of described diode D1 is electrically connected with the power supply of 12V, the end ground connection of described electric capacity EC1.
Described resistance R 2 is electrically connected with the anode of electric capacity EC2 and diode D2, the other end ground connection of described electric capacity EC2.Be provided with the diode D4 that is electrically connected with described triode Q3 and described triode Q4 between the base stage of the collector electrode of described triode Q3 and described triode Q4.Be electrically connected with an end of resistance R 3 between the collector electrode of described triode Q3 and the described diode D4, the other end of described resistance R 3 is electrically connected with secondary signal output P3.
Be electrically connected with resistance R 9 between the emitter of described triode Q4 and the base stage, the emitter of described triode Q4 is electrically connected with the diode D3 that is electrically connected with described power supply and diode D2, the collector electrode of described triode Q4 is electrically connected with resistance R 4, and described resistance R 4 is electrically connected with signal output part P0.Be electrically connected with resistance R 6 between the collector electrode of described triode Q4 and the described resistance R 4, the other end ground connection of described resistance R 6.
The base stage of described triode Q4 is electrically connected with resistance R 5, one end of described resistance R 5 is electrically connected with the collector electrode of triode Q2, the grounded emitter of described triode Q2, the base stage of described triode Q2 is connected with resistance R 8, and described resistance R 8 is electrically connected with secondary signal input control end P2.Described muting control circuit 2 is provided with the voltage-stabiliser tube D5 and the triode Q1 of mutual series connection, the base stage of described triode Q1 is electrically connected with an end of resistance R 7, the other end of described resistance R 7 is electrically connected with first signal input control end P1, the grounded emitter of described triode Q1.
The present invention is used for cooperating with the audio-frequency power amplifier of back level, described signal output part P0 is electrically connected with audio-frequency power amplifier, described audio-frequency power amplifier has three kinds of operating states, promptly the voltage as described signal output part P0 is respectively 0V, when 5V and 12V, described audio-frequency power amplifier is respectively shutdown, quiet and opening, its operation principle is as follows: after powering on, + 12V supply voltage charges to electric capacity EC1 through diode D1, the about 0.5V of diode D1 pressure drop, electric capacity EC1 charging voltage is 11.5V, electric capacity EC2 also charges simultaneously, the electric capacity EC2 charging interval long (T=RC), thereby charging current makes triode Q3 conducting, and the Q3 collector electrode just has 11.5 volts voltage, and this voltage is delivered to the base stage of triode Q4 through diode D4, triode Q4 ends, then signal output part P0 voltage is 0V, and at this moment, described audio-frequency power amplifier is an off-mode.The time that continues off-mode, the R2 parameter determined by EC2.
When power down, electric capacity EC1 can pass through triode Q3, resistance R 2 and diode D2 discharge, triode Q3 conducting, the voltage of electric capacity EC1 is delivered to the base stage of described triode Q4, and triode Q4 ends, and then described signal output part P0 voltage is 0V, at this moment, described audio-frequency power amplifier is an off-mode.Put high level by described secondary signal input control end P2, then also can make control corresponding.
When thinking that described audio-frequency power amplifier is set to mute state, only described first signal input control end P1 need be put high level, then triode Q1 conducting, described signal output part P0 voltage is 5.6V by clamper, then described audio-frequency power amplifier is a mute state.If need described audio-frequency power amplifier is returned to the function opening, only need that described first signal input control end P1 is put low level and get final product.
In sum, the quiet quick control circuit of audio-frequency power amplifier of the present invention is by described cooperation of going up power down mute circuit 1 and muting control circuit 2, thereby can realize that quiet control rate is fast, the controlled audio-frequency power amplifier of handoff procedure impacts little to power supply, in addition, this circuit structure is simple, and cost is low.
The above embodiment has only expressed one embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as limitation of the scope of the invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with claims.
Claims (10)
1. quiet quick control circuit of audio-frequency power amplifier, it comprises power down mute circuit (1) and muting control circuit (2), it is characterized in that: the described power down mute circuit (1) of going up is provided with triode Q3 and triode Q4, the base stage of described triode Q3 is electrically connected with an end of resistance R 1 and an end of resistance R 2, the emitter of described resistance R 1 and triode Q3 all is electrically connected to power supply and electric capacity EC1, described resistance R 2 is electrically connected with the anode of electric capacity EC2 and diode D2, the collector electrode of described triode Q3 is electrically connected with the base stage of described triode Q4, be electrically connected with resistance R 9 between the emitter of described triode Q4 and the base stage, the emitter of described triode Q4 is electrically connected to described power supply and diode D2, the collector electrode of described triode Q4 is electrically connected with resistance R 4, and described resistance R 4 is electrically connected with signal output part P0; Described muting control circuit (2) is provided with the voltage-stabiliser tube D5 and the triode Q1 of mutual series connection, and the base stage of described triode Q1 is electrically connected to first signal input control end P1, the grounded emitter of described triode Q1.
2. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 is characterized in that: the emitter of described triode Q3 and electric capacity EC1 all are connected with the negative electrode of diode D1, and the anode of described diode D1 is electrically connected with power supply.
3. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 and 2 is characterized in that: be provided with diode D3 between the emitter of described power supply and described triode Q4.
4. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 and 2, it is characterized in that: the base stage of described triode Q4 is electrically connected with resistance R 5, one end of described resistance R 5 is electrically connected with the collector electrode of triode Q2, the grounded emitter of described triode Q2, the base stage of described triode Q2 is connected with resistance R 8, and described resistance R 8 is electrically connected with secondary signal input control end P2.
5. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 and 2 is characterized in that: the end of described electric capacity EC1 links to each other other end ground connection with the emitter of described triode Q3.
6. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 and 2 is characterized in that: the end of described electric capacity EC2 links to each other other end ground connection with described resistance R 2.
7. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 and 2 is characterized in that: be electrically connected with resistance R 6 between the collector electrode of described triode Q4 and the described resistance R 4, the other end ground connection of described resistance R 6.
8. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 and 2 is characterized in that: be provided with resistance R 7 between the base stage of described triode Q1 and described first signal input control end P1.
9. the quiet quick control circuit of audio-frequency power amplifier according to claim 1 and 2 is characterized in that: be provided with diode D4 between the base stage of the collector electrode of described triode Q3 and described triode Q4.
10. the quiet quick control circuit of audio-frequency power amplifier according to claim 9, it is characterized in that: be electrically connected with an end of resistance R 3 between the collector electrode of described triode Q3 and the described diode D4, the other end of described resistance R 3 is electrically connected with secondary signal output P3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010607628 CN102098011B (en) | 2010-12-28 | 2010-12-28 | Circuit for rapidly controlling mute of audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010607628 CN102098011B (en) | 2010-12-28 | 2010-12-28 | Circuit for rapidly controlling mute of audio power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102098011A true CN102098011A (en) | 2011-06-15 |
| CN102098011B CN102098011B (en) | 2013-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010607628 Active CN102098011B (en) | 2010-12-28 | 2010-12-28 | Circuit for rapidly controlling mute of audio power amplifier |
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| Country | Link |
|---|---|
| CN (1) | CN102098011B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037287A (en) * | 2012-11-26 | 2013-04-10 | 华为技术有限公司 | Mute circuit and electronic equipment with the same |
| CN105196934A (en) * | 2015-10-21 | 2015-12-30 | 重庆金宏汽车电子有限公司 | Muting circuit of navigation equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070093222A1 (en) * | 2005-10-21 | 2007-04-26 | Funai Electric Co., Ltd. | Audio muting circuit and audio muting method |
| CN1956523A (en) * | 2005-10-27 | 2007-05-02 | 海尔集团公司 | Device and method for removing noise of TV set off |
| CN200953603Y (en) * | 2006-10-18 | 2007-09-26 | 青岛海信电器股份有限公司 | Switch-on and off silent circuit and television with the said silent circuit |
| CN201039105Y (en) * | 2007-05-09 | 2008-03-19 | 青岛海信电器股份有限公司 | Silence control circuit |
| CN201947224U (en) * | 2010-12-28 | 2011-08-24 | 东莞常禾电子有限公司 | Fast mute control circuit for audio frequency power amplifier |
-
2010
- 2010-12-28 CN CN 201010607628 patent/CN102098011B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070093222A1 (en) * | 2005-10-21 | 2007-04-26 | Funai Electric Co., Ltd. | Audio muting circuit and audio muting method |
| CN1956523A (en) * | 2005-10-27 | 2007-05-02 | 海尔集团公司 | Device and method for removing noise of TV set off |
| CN200953603Y (en) * | 2006-10-18 | 2007-09-26 | 青岛海信电器股份有限公司 | Switch-on and off silent circuit and television with the said silent circuit |
| CN201039105Y (en) * | 2007-05-09 | 2008-03-19 | 青岛海信电器股份有限公司 | Silence control circuit |
| CN201947224U (en) * | 2010-12-28 | 2011-08-24 | 东莞常禾电子有限公司 | Fast mute control circuit for audio frequency power amplifier |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037287A (en) * | 2012-11-26 | 2013-04-10 | 华为技术有限公司 | Mute circuit and electronic equipment with the same |
| CN105196934A (en) * | 2015-10-21 | 2015-12-30 | 重庆金宏汽车电子有限公司 | Muting circuit of navigation equipment |
| CN105196934B (en) * | 2015-10-21 | 2017-09-29 | 重庆金宏汽车电子有限公司 | The mute circuit of navigation equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102098011B (en) | 2013-11-06 |
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