CN102227130B - Driving system of audio-frequency power amplifier of liquid crystal television set - Google Patents
Driving system of audio-frequency power amplifier of liquid crystal television set Download PDFInfo
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- CN102227130B CN102227130B CN 201110160456 CN201110160456A CN102227130B CN 102227130 B CN102227130 B CN 102227130B CN 201110160456 CN201110160456 CN 201110160456 CN 201110160456 A CN201110160456 A CN 201110160456A CN 102227130 B CN102227130 B CN 102227130B
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Abstract
The invention discloses a driving system of an audio-frequency power amplifier of a liquid crystal television set. The driving system comprises a power amplifier module, a mute module, a time-delay module, and a discharge module. Mute control is carried out on the power amplifier module by the mute module; the time-delay module releases power to a power amplifier chip and the discharge module when power is cut off; the discharge module discharges signals to the ground at the moment of power on and power off, wherein the signals are output by the power amplifier module. According to the invention, a problem of a time-ordered difference is effectively solved, wherein the difference exists between matching of power supply source and an audio-frequency driving scheme; and a plosion problem of the audio-frequency power amplifier is also effectively solved, so that plosion of the audio-frequency power amplifier will not occur during four states of power on, turn off, mute and standby.
Description
Technical field
The present invention relates to the liquid crystal TV set technical field, particularly a kind of drive system of plosive audio frequency power amplifier when eliminating the liquid crystal TV set switching on and shutting down.
Background technology
Along with popularizing of liquid crystal TV set, liquid crystal drive scheme and power source design such as stream emerge in large numbers, yet there is the difference of sequential in the collocation of the power supply that each producer provides and liquid crystal drive scheme, opening electric sequential and closing electric sequential of power supply output is all different, and the control I/O mouth default conditions of each drive scheme are also different.
Take the drive system of the audio frequency power amplifier of liquid crystal TV set as example, general power supply output several groups of voltages such as 24V, 12V, 5V are arranged, and the trailing edge of the start rising edge of every group of voltage, shutdown power down is all different, when to such an extent as to the voltage of 12V, 5V occurring and being down to 0V, the voltage of 24V also has residual about 10V, so, can make the drive system of power amplifier occur unusual: because in one period discharge time after AC power supplies (AC power) outage, the drive system of audio frequency power amplifier is just not controlled, just produces easily plosive at the power amplifier output.
Plosive technical scheme when in view of this, being necessary to provide a kind of elimination liquid crystal TV set switching on and shutting down.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of drive system of audio frequency power amplifier of liquid crystal TV set, produce plosive problem when the switching on and shutting down with the liquid crystal TV set that solves prior art.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of drive system of audio frequency power amplifier of liquid crystal TV set wherein, comprising:
Power amplifier module amplifies to drive first, second loud speaker for the signal of telecommunication with input and sounds, and it comprises a power amplifier chips;
Quiet module, be used for power amplifier module is implemented quiet control, described quiet module comprises: the first electric capacity and the first diode, the minus earth of described the first electric capacity, its positive pole connects the collector electrode of the first triode by the 3rd resistance, the positive pole of described the first diode connects power supply, its negative pole connects the state control pin of power amplifier chips by the first resistance, the grounded emitter of described the first triode, the base stage of described the first triode is by the quiet control pin of the 4th resistance connection MCU chip, and the collector electrode of described the first triode is successively by the 3rd resistance, the second resistance connects the state control pin of power amplifier chips;
Time delay module, storage of electrical energy during energising, and after outage, can discharge electric energy to power amplifier chips and the module of releasing,
Described time delay module comprises: the second diode, the positive pole of described the second diode connects power supply, its negative pole connects the positive pole of the second electric capacity and the emitter of the second triode, the minus earth of described the second electric capacity, the base stage of described the second triode connects power supply by the 5th resistance, the collector electrode of described the second triode is connected to the base stage of the 5th triode by the 6th resistance, the grounded emitter of the 5th triode, collector electrode is connected to the state control pin of power amplifier chips, the 7th resistance one end connects the Opportunity awaiting control for linear pin of MCU chip, and an end connects the base stage of the 5th triode;
The module of releasing in energising and outage moment, is released over the ground to the signal of power amplifier module output;
Described power amplifier module connects respectively quiet module, time delay module and the module of releasing,
The described module of releasing comprises:
The 3rd triode, its base stage is by the Opportunity awaiting control for linear pin of the 8th resistance connection MCU chip, and collector electrode connects the first loud speaker, grounded emitter;
The 4th triode, its base stage links to each other with the base stage of the 3rd triode, and collector electrode connects the second loud speaker, grounded emitter;
The 3rd electric capacity, its anodal base stage that connects the 3rd triode, minus earth.
The drive system of the audio frequency power amplifier of liquid crystal TV set provided by the invention, comprise: power amplifier module, quiet module, time delay module and the module of releasing, by quiet module power amplifier module is implemented quiet control, time delay module discharges electric energy to power amplifier module after outage, the module of releasing is released to the signal of power amplifier module output over the ground in energising and the moment of cutting off the power supply, effectively solved the problem of the timing difference that exists between the collocation of power supply and audio driven scheme, effectively solve the plosive difficult problem of audio frequency power amplifier, guaranteed that it is in energising, close electricity, quiet, the standby one of four states plosive can not occur.
Description of drawings
Fig. 1 is the structured flowchart of drive system of the audio frequency power amplifier of liquid crystal TV set of the present invention.
Fig. 2 is the circuit theory diagrams of the quiet module of the embodiment of the invention.
Fig. 3 is the circuit theory diagrams of the Postponement module of the embodiment of the invention.
Fig. 4 is the circuit theory diagrams of the module of releasing of the embodiment of the invention.
Embodiment
The invention provides a kind of drive system of audio frequency power amplifier of liquid crystal TV set.For making purpose of the present invention, technical scheme and effect clearer, clear and definite, the present invention is described in more detail referring to the accompanying drawing examples.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
See also Fig. 1, it is the structured flowchart of drive system of the audio frequency power amplifier of liquid crystal TV set of the present invention.As shown in the figure, the drive system of the audio frequency power amplifier of described liquid crystal TV set comprises: power amplifier module 100, quiet module 200, time delay module 300 and the module 400 of releasing, described power amplifier module 100 connect respectively quiet module 200, time delay module 300 and the module 400 of releasing.
Particularly, described power amplifier module 100 amplifies to drive first, second loud speaker for the signal of telecommunication with input sounds, and it comprises a power amplifier chips.Because in the present invention, the circuit of power amplifier module can adopt known audio power amplifier circuit, and its circuit theory diagrams are known technology, and is simple in order to describe, here superfluous having stated no longer one by one just.Described quiet module 200 is used for power amplifier module 100 is implemented quiet control.Described time delay module 300 is used for storage of electrical energy when energising, and can discharge electric energy to power amplifier module 100 after outage.The described module 400 of releasing is used in energising and cuts off the power supply moment, and the signal of power amplifier module 100 outputs is released over the ground.The circuit theory diagrams of described quiet module 200, time delay module 300 and the module 400 of releasing can be described in the back one by one, and it can solve the plosive difficult problem of power amplifier effectively by cooperating between several modules and the power amplifier module.Can make referrals to below the concrete methods of realizing.
Please continue to consult Fig. 2, Fig. 2 is the circuit theory diagrams of the quiet module of the embodiment of the invention, as shown in the figure, described quiet module comprises the first electric capacity 210 and the first diode 220, the minus earth of described the first electric capacity 210, its anodal collector electrode that connects the first triode 240 by the 3rd resistance 230, the positive pole of described the first diode 220 connects power supply VCC(and generally adopts 12V), its negative pole connects the state control pin 110 of power amplifier chips by the first resistance 250, the grounded emitter of described the first triode 240, the base stage of described the first triode 240 is by the quiet control pin 120 of the 4th resistance 260 connection MCU chips, and the collector electrode of described the first triode 240 is successively by the 3rd resistance 230, the second resistance 270 connects the state control pin 110 of power amplifier chips.
Please continue to consult Fig. 3, Fig. 3 is the circuit theory diagrams of the time delay module of the embodiment of the invention, as shown in the figure, described time delay module comprises: the second diode 310, the positive pole of described the second diode 310 connects power supply VCC, its negative pole connects the positive pole of the second electric capacity 320 and the emitter of the second triode 330, the minus earth of described the second electric capacity 320, the base stage of described the second triode 330 connects power supply VCC by the 5th resistance 340, the collector electrode of described the second triode 330 is connected to the base stage of the 5th triode 440 by the 6th resistance 350, the grounded emitter of the 5th triode 440, collector electrode is connected to the state control pin 110 of power amplifier chips, the 7th resistance 360 1 ends connect the Opportunity awaiting control for linear pin 130 of MCU chip, and the other end links to each other with the base stage of the 5th triode 440.
Please continue to consult Fig. 4, Fig. 4 is the circuit theory diagrams of the module of releasing of the embodiment of the invention, as shown in the figure, the described module of releasing comprises: the 3rd triode 410, its base stage connects the Opportunity awaiting control for linear pin 130 of MCU chip by the 8th resistance 460, its collector electrode connects the first loud speaker 140, its grounded emitter; The 4th triode 420, its base stage links to each other with the base stage of the 3rd triode 410, and collector electrode connects the second loud speaker 150, grounded emitter; The 3rd electric capacity 430, its anodal base stage that connects the 3rd triode 410, minus earth.
In embodiments of the present invention, the state control pin 110 of the power amplifier chips that comprises in the described power amplifier module enables pin for mute/standby, its state of a control is that 0-2V is the standby(standby) state, 3-5V is that mute(is quiet) state, 6V-12V is operating state, quiet control pin 120 and Opportunity awaiting control for linear pin 130 are the control mouth of MCU (being the I/O interface), the control mouth default conditions of quiet control pin and Opportunity awaiting control for linear pin are high level, control respectively the quiet and idle function of power amplifier.In this circuit, the first diode 210, the second diode 310 are isolating diode, and it act as and prevents that electric current from pouring in down a chimney.The second electric capacity 320 is storage capacitor, be used in the present embodiment VCC=12V of operating voltage VCC() provide electric energy for the second triode 330 after the power down, make 330 conductings of the second triode, thereby control 440 conductings of the 5th triode, allow power amplifier enable pin over the ground, make audio frequency power amplifier force to enter the STANDBY state.
The below introduces the operating state of drive system of the audio frequency power amplifier of described liquid crystal TV set, continue to consult Fig. 2, Fig. 3 and Fig. 4, after system's energising, be that VCC equals 12V, MUTE, the STANDBY of MCU control power amplifier are high level, 12V charges to the second electric capacity 320 by the second triode 310 simultaneously, the 3rd triode 410, the 4th triode 420 all are conducting state at this moment, any disturbing wave all can pass through the 3rd triode 410, the 4th triode 420 to ground, thereby can not produce plosive in the moment of switching on.And when system power failure, be that the 12V power supply is switched off, then drop to 0V from+12V moment, MUTE, the STANDBY of MCU control power amplifier is slave mode not, but still store electric energy in the second electric capacity 310, the second triode 330 meeting conductings when 12V drops to 0V suddenly, the electric energy of the second electric capacity 310 is sent to the 5th triode 440, the 3rd triode 410, the 4th triode 420 makes it conducting over the ground, make the output of audio frequency power amplifier directly arrive ground, and enabling pin is the STANDBY state, thereby at the plosive that closes electricity moment elimination power amplifier.
Further, can also in power amplifier module, increase by a charging capacitor, its anodal VCC, minus earth of connecting.Be used for when power down, on the impact of power supply ripple, making power amplifier chips can also keep the operating state of certain hour when reducing the power amplifier power dynamics, guaranteed that more plosive can not occur.
The drive system of the audio frequency power amplifier of liquid crystal TV set provided by the invention, link to each other with the MCU chip of LCD TV, described drive system comprises: power amplifier module, quiet module, time delay module and the module of releasing, by quiet module power amplifier module is implemented quiet control, time delay module discharges electric energy to power amplifier chips and the module of releasing after outage, the module of releasing is released to the signal of power amplifier module output over the ground in energising and the moment of cutting off the power supply, effectively solved the problem of the timing difference that exists between the collocation of power supply and audio driven scheme, effectively solve the plosive difficult problem of audio frequency power amplifier, guaranteed that it is in energising, close electricity, quiet, the standby one of four states plosive can not occur.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (1)
1. the drive system of the audio frequency power amplifier of a liquid crystal TV set is characterized in that, comprising:
Power amplifier module amplifies to drive first, second loud speaker for the signal of telecommunication with input and sounds, and described power amplifier module also comprises a power amplifier chips;
Quiet module is used for power amplifier module is implemented quiet control,
Described quiet module comprises: the first electric capacity and the first diode, the minus earth of described the first electric capacity, its positive pole connects the collector electrode of the first triode by the 3rd resistance, the positive pole of described the first diode connects power supply, its negative pole connects the state control pin of power amplifier chips by the first resistance, the grounded emitter of described the first triode, the base stage of described the first triode is by the quiet control pin of the 4th resistance connection MCU chip, and the collector electrode of described the first triode connects the state control pin of power amplifier chips successively by the 3rd resistance, the second resistance;
Time delay module, storage of electrical energy during energising, and after outage, can discharge electric energy to power amplifier chips and the module of releasing,
Described time delay module comprises: the second diode, the positive pole of described the second diode connects power supply, its negative pole connects the positive pole of the second electric capacity and the emitter of the second triode, the minus earth of described the second electric capacity, the base stage of described the second triode connects power supply by the 5th resistance, the collector electrode of described the second triode is connected to the base stage of the 5th triode by the 6th resistance, the grounded emitter of the 5th triode, collector electrode is connected to the state control pin of power amplifier chips, the 7th resistance one end connects the Opportunity awaiting control for linear pin of MCU chip, and an end connects the base stage of the 5th triode;
The module of releasing is used in energising and outage moment the signal of power amplifier module output being released over the ground; Described power amplifier module connects respectively quiet module, time delay module and the module of releasing,
The described module of releasing comprises: the 3rd triode, and its base stage is by the Opportunity awaiting control for linear pin of the 8th resistance connection MCU chip, and collector electrode connects the first loud speaker, grounded emitter;
The 4th triode, its base stage links to each other with the base stage of the 3rd triode, and collector electrode connects the second loud speaker, grounded emitter;
The 3rd electric capacity, its anodal base stage that connects the 3rd triode, minus earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110160456 CN102227130B (en) | 2011-06-15 | 2011-06-15 | Driving system of audio-frequency power amplifier of liquid crystal television set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110160456 CN102227130B (en) | 2011-06-15 | 2011-06-15 | Driving system of audio-frequency power amplifier of liquid crystal television set |
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| CN102227130A CN102227130A (en) | 2011-10-26 |
| CN102227130B true CN102227130B (en) | 2013-01-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103458342B (en) * | 2013-09-18 | 2016-08-17 | 上海贝岭股份有限公司 | A kind of circuit eliminating shutdown POP sound of audio power amplifier |
| CN104994459B (en) * | 2015-06-17 | 2019-10-15 | Tcl海外电子（惠州）有限公司 | Terminal digital power amplifier configuration method and device |
| CN111263268B (en) * | 2020-01-15 | 2022-02-01 | 深圳创维数字技术有限公司 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6774684B2 (en) * | 2001-01-17 | 2004-08-10 | Cirrus Logic, Inc. | Circuits and methods for controlling transients during audio device power-up and power-down, and systems using the same |
| CN2744084Y (en) * | 2004-11-30 | 2005-11-30 | 海信集团有限公司 | Silent and protection circuit for television power amplifier |
| CN2838186Y (en) * | 2005-10-28 | 2006-11-15 | 海信集团有限公司 | Combined noise suppression circuit for television set |
| 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 |
| CN101582681B (en) * | 2009-05-13 | 2014-12-10 | 康佳集团股份有限公司 | Power amplifying circuit for eliminating turn-off noise |
| CN201629808U (en) * | 2009-12-30 | 2010-11-10 | 深圳市康冠技术有限公司 | Impact noise eliminating circuit and flat panel television |
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Address after: Xue Cheng Ke Zhu Road Guangzhou City, Guangdong province 510663 science No. 192 Applicant after: Guangzhou CVT Electronics Technology Co., Ltd. Address before: Xue Cheng Ke Zhu Road Guangzhou City, Guangdong province 510663 science No. 192 Applicant before: Guangzhou Shiyuan Electronics Technology Co., Ltd. |
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