CN101685961A - Power supply circuit of audio frequency power amplifier - Google Patents
Power supply circuit of audio frequency power amplifier Download PDFInfo
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- CN101685961A CN101685961A CN200910109231A CN200910109231A CN101685961A CN 101685961 A CN101685961 A CN 101685961A CN 200910109231 A CN200910109231 A CN 200910109231A CN 200910109231 A CN200910109231 A CN 200910109231A CN 101685961 A CN101685961 A CN 101685961A
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- audio frequency
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Abstract
The present invention discloses a power supply of an audio frequency power amplifier, comprising a power supply source for providing voltage to the whole power supply circuit of the audio frequency power amplifier, an audio frequency power amplifier, a normal power supply circuit for providing a working input voltage to the audio frequency power amplifier, a pre-power supply and protection circuitfor providing an input voltage having a certain rise time to the audio frequency power amplifier, and providing short circuit protection to the audio frequency power supplier, and a voltage detectingand alarm circuit for detecting the input voltage amplitude of the audio frequency power amplifier, outputting the detecting signal to control the working states of the pre-power supply and protection circuit and normal power supply circuit, and providing short circuit alarm to the audio frequency power supply circuit. The power supply circuit of the audio frequency power supply can effectively eliminate startup voice of television, provides protection and alarm when the audio frequency power supply is short-circuited, is simple, safe and reliable, as well as has low cost.
Description
[technical field]
The present invention relates to technical field of television sets, particularly a kind ofly can effectively eliminate the television boot-strap noise, and the power supply circuit of audio frequency power amplifier of protection can be provided when the power supply circuit of audio frequency power amplifier short circuit.
[background technology]
At present, the audio system of television set generally is earlier the audio frequency small-signal to be imported audio frequency power amplifier, exports to loud speaker after amplifying through audio frequency power amplifier, is sounded by loud speaker at last.The audio frequency power amplifier of television set is most important to audio system, and the power supply of audio frequency power amplifier tends to influence the effect of television sound system, especially when when start voltage instantaneous saltus step, because the coupling of audio frequency power amplifier internal capacitance and inductance, be easy to generate irregular audio signal output to loud speaker, thereby produce start-up noises.Simultaneously, television set needs bigger sound, so audio system need be exported enough big power, so the supply power voltage of audio frequency power amplifier is higher, supply current is bigger, when the power supply short circuit of audio frequency power amplifier very big harm will be arranged.At present television set is for eliminating start-up noises, and the audio frequency power amplifier power supply generally needs TV MCU to produce control signal to control or adopt other link of circuit guide sound system for electrical teaching, its cost height, complex structure; And audio frequency power amplifier power supply short-circuit protection is generally provided by power supply, and power supply by strict demand, has been increased the cost of power supply.
[summary of the invention]
For addressing the above problem, main purpose of the present invention is to provide a kind of can effectively eliminate the television boot-strap noise, and the power supply circuit of audio frequency power amplifier of protection can be provided when the power supply circuit of audio frequency power amplifier short circuit.
For achieving the above object, technical scheme of the present invention is:
A kind of power supply circuit of audio frequency power amplifier; being included as whole power supply circuit of audio frequency power amplifier provides the power supply of voltage; audio frequency power amplifier; the normal power supply circuit of work input voltage is provided for audio frequency power amplifier; input voltage with certain rise time is provided for audio frequency power amplifier; and provide the pre-power supply and the protective circuit of short-circuit protection for power supply circuit of audio frequency power amplifier; and the input voltage amplitude that is used to detect audio frequency power amplifier; output detection signal to be controlling the operating state of pre-power supply and protective circuit and normal power supply circuit, and voltage detecting that short circuit warns is provided and warns circuit for power supply circuit of audio frequency power amplifier.
Compared to prior art, power supply circuit of audio frequency power amplifier of the present invention can be eliminated the television boot-strap noise effectively, and provides protection and warn when audio frequency power amplifier power supply short circuit, and circuit is simple, cost is low, safe and reliable.
[description of drawings]
Fig. 1 is circuit theory diagrams of the present invention.
[embodiment]
See also shown in Figure 1; a kind of power supply circuit of audio frequency power amplifier of the present invention is included as the power supply that whole power supply circuit of audio frequency power amplifier provides voltage; audio frequency power amplifier; the normal power supply circuit of work input voltage is provided for audio frequency power amplifier; input voltage with certain rise time is provided for audio frequency power amplifier; and provide the pre-power supply and the protective circuit of short-circuit protection for power supply circuit of audio frequency power amplifier; and the input voltage amplitude that is used to detect audio frequency power amplifier; output detection signal to be controlling the operating state of pre-power supply and protective circuit and normal power supply circuit, and voltage detecting that short circuit warns is provided and warns circuit for power supply circuit of audio frequency power amplifier.
The power supply output voltage is VCC, and this voltage is generally 24V.VCC voltage offers voltage detecting and the circuit of warning, pre-power supply and protective circuit and normal power supply circuit.The input voltage of audio frequency power amplifier is VCC_AMP.
Voltage detecting includes the light-emitting diode D1 that is connected power supply output voltage V CC, the first triode Q1 that is connected with light-emitting diode D1, the second triode Q2 that is connected with the first triode Q1 and the 7th, the 8th, the 9th resistance R 7, R8, R9 with the circuit of warning.Wherein, the positive pole of light-emitting diode D1 links to each other with VCC, and negative pole is connected to the emitter of the first triode Q1; The base stage of the first triode Q1 is connected to the input voltage VCC_AMP of audio frequency power amplifier by the 7th resistance R 7, and collector electrode links to each other with the base stage of the second triode Q2 by the 8th resistance R 8; The grounded emitter of the second triode Q2, collector electrode is connected to power supply VCC by the 9th resistance R 9, simultaneously, collector electrode output detection signal DET_S.
Pre-power supply and protective circuit include the 3rd metal-oxide-semiconductor Q3, the diode D2 that is connected with the 3rd metal-oxide-semiconductor Q3 by the 4th resistance R 4, the 3rd capacitor C 3 and the 5th resistance R 5 and the 4th capacitor C 4 that is connected with the 3rd metal-oxide-semiconductor and the 3rd resistance R 3 that is connected with diode D2.Wherein, the 2nd pin of the 3rd metal-oxide-semiconductor Q3 links to each other with power supply VCC, and the 1st pin links to each other with the 4th capacitor C 4 and the 3rd resistance R 3, and the 3rd pin links to each other with the 4th resistance R 4.One end of the 4th capacitor C 4 is with outside the 3rd metal-oxide-semiconductor Q3 links to each other, and the other end links to each other with power supply VCC.One end of the 3rd resistance R 3 is with outside the 3rd metal-oxide-semiconductor Q3 links to each other, and the other end and second, first resistance R 2, R1 link to each other, and the other end of second resistance R 2 links to each other with VCC, and the other end of first resistance R 1 links to each other with detection signal DET_S.One end of the 4th resistance R 4 is with outside the 3rd metal-oxide-semiconductor Q3 links to each other, and the other end links to each other with the 6th resistance R 6, and the other end of the 6th resistance R 6 links to each other with diode D2, and the other end of diode D2 is connected to the input voltage VCC_AMP that is connected to audio frequency power amplifier.The 3rd capacitor C 3 is connected to the input voltage VCC_AMP that is connected to audio frequency power amplifier with an end of the 5th resistance R 5, and the other end is ground connection together.
The 5th triode Q5 that the normal power supply circuit includes the 4th metal-oxide-semiconductor Q4 and links to each other with the 4th metal-oxide-semiconductor Q4 by the tenth resistance R 10.Wherein, the 2nd pin of the 4th metal-oxide-semiconductor Q4 links to each other with power supply VCC, the 3rd pin is connected to the input voltage VCC_AMP of audio frequency power amplifier, and the 1st pin links to each other with the 11, the tenth resistance R 11, R10, the other end of the 11 resistance R 11 links to each other with power supply VCC, and the other end of the tenth resistance R 10 links to each other with the collector electrode of the 5th triode Q5.The grounded emitter of the 5th triode Q5, base stage links to each other with the 5th capacitor C the 5, the 12 resistance R 12, and the other end ground connection of the 5th capacitor C 5, the other end of the 12 resistance R 12 link to each other with detection signal DET_S.
Television boot-strap moment, the magnitude of voltage of power supply output is VCC, and the input voltage VCC_AMP of audio frequency power amplifier is connected to ground by the 5th resistance R 5, and then the magnitude of voltage of VCC_AMP is 0V.Just after the start, television set enters pre-charging stage, and the magnitude of voltage of A end is VCC, and the magnitude of voltage of B end is 0V.There is voltage difference VCC in side a and b, light-emitting diode D1 conducting, and the first triode Q1 saturation conduction, light-emitting diode D1 begins luminous.VCC is by behind light-emitting diode D1, the first triode Q1, the collector voltage value of the first triode Q1 is than the low about 0.8V of VCC, this voltage makes the second triode Q2 saturation conduction, then the detection signal DET_S of the about 0.3V of the very fast output of the collector electrode of the second triode Q2 by the 8th resistance R 8.Detection signal DET_S is 0.3V, VCC begins to 4 chargings of the 4th capacitor C, simultaneously owing to second resistance R 2, first resistance R, 1 dividing potential drop, make the magnitude of voltage of second resistance R 2, first resistance R 1, the 3rd resistance R 3 junction C end rise to very soon about 0.7VCC, promptly the magnitude of voltage of the 3rd metal-oxide-semiconductor Q3 the 1st pin is 0.7VCC.The 2nd pin of the 3rd metal-oxide-semiconductor Q3 and the pressure reduction between the 1st pin are about 0.3VCC, saturation conduction, and VCC begins precharge by the 3rd metal-oxide-semiconductor Q3, the 4th resistance R 4, the 6th resistance R 6 and diode D2 to the 3rd capacitor C 3.The insurance resistance that the 6th resistance R 6 resistances are very little almost can be ignored the influence of precharge time, and be to be determined by the 4th resistance R 4 and the 3rd capacitor C 3 rise time of audio frequency power amplifier input voltage VCC_AMP precharge time.The 4th resistance R 4 is the thermistor of negative temperature coefficient, and resistance value is bigger when just beginning precharge, and it is slower to charge, and VCC_AMP rises slower; Carry out along with precharge, the resistance value of the 4th resistance R 4 will reduce gradually, and charging will be accelerated gradually, and VCC_AMP rises and will accelerate gradually.Detection signal DET_S is 0.2V, and then the 1st pin of the 5th metal-oxide-semiconductor Q5 is 0.2V, and the 5th metal-oxide-semiconductor Q5 does not have conducting, and then the magnitude of voltage of the 4th metal-oxide-semiconductor Q4 the 1st pin is VCC, and its 1st pin and the 2nd pin voltage difference are 0V, not conducting.
Carry out along with precharge, audio frequency power amplifier input voltage VCC_AMP rises gradually, when the voltage difference of VCC_AMP and VCC during approximately less than 0.8V, enters the normal power supply stage.A holds the voltage difference of holding with B less than 0.8V, light-emitting diode D1, the first not conducting of triode Q1, and light-emitting diode D1 is not luminous.The first not conducting of triode Q1 does not have electric current to flow through the base stage of the second triode Q2, and the second triode Q2 can not conducting.Power supply VCC is to 5 chargings of the 5th capacitor C, and the voltage of the 5th metal-oxide-semiconductor Q5 the 1st pin rises to about 0.6V very soon, saturation conduction, and then the magnitude of voltage of its 3rd pin is about 0.3V.After VCC passes through the 11 resistance R 11, the tenth resistance R 10 dividing potential drops, the magnitude of voltage of the 4th metal-oxide-semiconductor Q4 the 1st pin is 0.1VCC, the quick saturation conduction of the 4th metal-oxide-semiconductor Q4, and the 2nd pin and the pressure drop between the 3rd pin of the 4th metal-oxide-semiconductor Q4 are very little, and audio frequency power amplifier input voltage VCC_AMP and VCC magnitude of voltage are almost equal.After the dividing potential drop of VCC by the 9th resistance R the 9, the 12 resistance R 12 and second resistance R 2, first resistance R 1, the magnitude of voltage of detection signal DET_S is 0.98VCC, the magnitude of voltage of C end is 0.006VCC, promptly the magnitude of voltage of the 3rd metal-oxide-semiconductor Q3 the 1st pin is 0.006VCC, the 2nd pin and the voltage difference between the 1st pin of the 3rd metal-oxide-semiconductor Q3 are 0.006VCC, not conducting.
Pre-charging stage light-emitting diode D1 is luminous and will be maintained to and enter normal power supply before the stage, and VCC provides the input voltage with certain rise time by the 3rd metal-oxide-semiconductor Q3 to audio frequency power amplifier, can effectively eliminate the television boot-strap noise.The normal power supply stage, light-emitting diode D1 was not luminous, and VCC directly provides input voltage to audio frequency power amplifier by the 4th metal-oxide-semiconductor Q4, does not pass through resistance, has avoided extra power consumption.
When there was short circuit in the B end, the value of audio frequency power amplifier input voltage VCC_AMP was always 0V, and the voltage difference that A, B end exists is VCC, and voltage detecting is always about 0.3V with the DET_S magnitude of voltage of the circuit output of warning, and light-emitting diode D1 is luminous.The DET_S magnitude of voltage is always about 0.3V, then the 3rd metal-oxide-semiconductor Q3 saturation conduction.VCC is connected directly to ground by the 3rd metal-oxide-semiconductor Q3, the 4th resistance R 4, the 6th resistance R 6, diode D2, will can not give the 3rd capacitor C 3 chargings, and the 4th resistance R 4 is big resistance resistance, and VCC will be less than very big electric current.Along with rising the 4th resistance of its temperature reduces rapidly, very big electric current will be arranged by the 3rd metal-oxide-semiconductor Q3, the 4th resistance R 4, the 6th resistance R 6, diode D2, the 6th resistance R 6 will fuse, thereby carry out short-circuit protection.In the short circuit process, light-emitting diode D1 will luminously always carry out short circuit and warn.
A kind of power supply circuit of audio frequency power amplifier of the present invention and television set thereof can be stablized rational input voltage for the tv audio power amplifier provides, and eliminate the television boot-strap noise effectively, provide when short circuit occurring for the audio frequency power amplifier input voltage simultaneously and warn and short-circuit protection.This circuit cost is low, and advantages of simple is safe and reliable, has important practical and is worth.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (10)
1. power supply circuit of audio frequency power amplifier; being included as whole power supply circuit of audio frequency power amplifier provides the power supply of voltage; audio frequency power amplifier; the normal power supply circuit of work input voltage is provided for audio frequency power amplifier; it is characterized in that: comprise that also promising audio frequency power amplifier provides the input voltage with certain rise time; and provide the pre-power supply and the protective circuit of short-circuit protection for power supply circuit of audio frequency power amplifier; and the input voltage amplitude that is used to detect audio frequency power amplifier; output detection signal to be controlling the operating state of pre-power supply and protective circuit and normal power supply circuit, and voltage detecting that short circuit warns is provided and warns circuit for power supply circuit of audio frequency power amplifier.
2. power supply circuit of audio frequency power amplifier as claimed in claim 1 is characterized in that: described voltage detecting includes the light-emitting diode (D1) that is connected power supply output voltage (VCC), first triode (Q1) that is connected with light-emitting diode (D1), second triode (Q2) that is connected with first triode (Q1) and the 7th, the 8th, the 9th resistance (R7), (R8), (R9) with the circuit of warning.
3. power supply circuit of audio frequency power amplifier as claimed in claim 2 is characterized in that: described pre-power supply and protective circuit include the 3rd metal-oxide-semiconductor (Q3), diode (D2), the 3rd electric capacity (C3) that is connected with diode (D2) and the 5th resistance (R5) that is connected with the 3rd metal-oxide-semiconductor (Q3) by the 4th resistance (R4) and the 4th electric capacity (C4) and the 3rd resistance (R3) that is connected with the 3rd metal-oxide-semiconductor.
4. power supply circuit of audio frequency power amplifier as claimed in claim 3 is characterized in that: the 5th triode (Q5) that described normal power supply circuit includes the 4th metal-oxide-semiconductor (Q4) and links to each other with the 4th metal-oxide-semiconductor (Q4) by the tenth resistance (R10).
5. power supply circuit of audio frequency power amplifier as claimed in claim 4 is characterized in that: the positive pole of described light-emitting diode (D1) links to each other with (VCC), and negative pole is connected to the emitter of first triode (Q1); The base stage of first triode (Q1) is connected to the input voltage (VCC_AMP) of audio frequency power amplifier by the 7th resistance (R7), and collector electrode links to each other with the base stage of second triode (Q2) by the 8th resistance (R8); The grounded emitter of second triode (Q2), collector electrode is connected to power supply (VCC) by the 9th resistance (R9), simultaneously, collector electrode output detection signal (DET_S).
6. power supply circuit of audio frequency power amplifier as claimed in claim 5, it is characterized in that: the 2nd pin of described the 3rd metal-oxide-semiconductor (Q3) links to each other with power supply (VCC), the 1st pin links to each other with the 4th electric capacity (C4) and the 3rd resistance (R3), and the 3rd pin links to each other with the 4th resistance (R4).
7. power supply circuit of audio frequency power amplifier as claimed in claim 6 is characterized in that: an end of described the 4th electric capacity (C4) is with outside the 3rd metal-oxide-semiconductor (Q3) links to each other, and the other end links to each other with power supply (VCC); And an end of described the 3rd resistance (R3) is with outside the 3rd metal-oxide-semiconductor (Q3) links to each other, the other end and second, first resistance (R2), (R1) link to each other, the other end of second resistance (R2) links to each other with (VCC), and the other end of first resistance (R1) links to each other with detection signal (DET_S).
8. power supply circuit of audio frequency power amplifier as claimed in claim 7 is characterized in that: described the 4th resistance (R4) is the thermistor of negative temperature coefficient.
9. power supply circuit of audio frequency power amplifier as claimed in claim 8 is characterized in that: the insurance resistance that described the 6th resistance (R6) resistance is very little.
10. television set is characterized in that: it includes the described audio frequency power amplifier electricity of claim 9 circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910109231 CN101685961B (en) | 2009-08-03 | 2009-08-03 | Power supply circuit of audio frequency power amplifier |
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| CN 200910109231 CN101685961B (en) | 2009-08-03 | 2009-08-03 | Power supply circuit of audio frequency power amplifier |
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| CN101685961A true CN101685961A (en) | 2010-03-31 |
| CN101685961B CN101685961B (en) | 2013-10-30 |
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| CN 200910109231 Active CN101685961B (en) | 2009-08-03 | 2009-08-03 | Power supply circuit of audio frequency power amplifier |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102202252A (en) * | 2011-05-06 | 2011-09-28 | 广州励丰声光科技有限公司 | Intelligent management system of active loudspeakers |
| CN103455300A (en) * | 2012-05-29 | 2013-12-18 | 鸿富锦精密工业(武汉)有限公司 | Noise abatement circuit |
| CN105049983A (en) * | 2015-07-16 | 2015-11-11 | 苏州欧可罗电子科技有限公司 | Wireless loudspeaker box based on WIFI and power amplifier overload protection |
| CN106878872A (en) * | 2017-04-14 | 2017-06-20 | 深圳创维－Rgb电子有限公司 | A kind of peripheral circuit for eliminating noise signal |
| CN106941648A (en) * | 2017-05-03 | 2017-07-11 | 广州市花都区国光音频科技中心（普通合伙） | The multi-functional intelligent sound system of one kind set |
| CN109787568A (en) * | 2017-11-15 | 2019-05-21 | 上海航空电器有限公司 | A kind of mute control of band, multiple protection functions power amplifier structure |
| CN110286946A (en) * | 2019-06-25 | 2019-09-27 | 合肥联宝信息技术有限公司 | Control method, controller and the computer-readable medium of system starting |
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| CN1540980A (en) * | 2003-11-01 | 2004-10-27 | 深圳创维－Rgb电子有限公司 | Soft starting up and pousing circuit for color TV |
| TWM284035U (en) * | 2005-08-30 | 2005-12-21 | System General Corp | Control circuit for proportional driving switching power supply |
| CN101073990A (en) * | 2007-06-22 | 2007-11-21 | 深圳先进技术研究院 | Power-supply system with safety protector for electric automobile and its control |
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| CN1540980A (en) * | 2003-11-01 | 2004-10-27 | 深圳创维－Rgb电子有限公司 | Soft starting up and pousing circuit for color TV |
| TWM284035U (en) * | 2005-08-30 | 2005-12-21 | System General Corp | Control circuit for proportional driving switching power supply |
| CN101073990A (en) * | 2007-06-22 | 2007-11-21 | 深圳先进技术研究院 | Power-supply system with safety protector for electric automobile and its control |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202252A (en) * | 2011-05-06 | 2011-09-28 | 广州励丰声光科技有限公司 | Intelligent management system of active loudspeakers |
| CN103455300A (en) * | 2012-05-29 | 2013-12-18 | 鸿富锦精密工业(武汉)有限公司 | Noise abatement circuit |
| CN105049983A (en) * | 2015-07-16 | 2015-11-11 | 苏州欧可罗电子科技有限公司 | Wireless loudspeaker box based on WIFI and power amplifier overload protection |
| CN106878872A (en) * | 2017-04-14 | 2017-06-20 | 深圳创维－Rgb电子有限公司 | A kind of peripheral circuit for eliminating noise signal |
| CN106878872B (en) * | 2017-04-14 | 2019-12-27 | 深圳创维－Rgb电子有限公司 | Peripheral circuit for eliminating noise signal |
| CN106941648A (en) * | 2017-05-03 | 2017-07-11 | 广州市花都区国光音频科技中心（普通合伙） | The multi-functional intelligent sound system of one kind set |
| CN109787568A (en) * | 2017-11-15 | 2019-05-21 | 上海航空电器有限公司 | A kind of mute control of band, multiple protection functions power amplifier structure |
| CN109787568B (en) * | 2017-11-15 | 2023-07-28 | 上海航空电器有限公司 | Power amplifier circuit structure with mute control and multiple protection functions |
| CN110286946A (en) * | 2019-06-25 | 2019-09-27 | 合肥联宝信息技术有限公司 | Control method, controller and the computer-readable medium of system starting |
| CN110286946B (en) * | 2019-06-25 | 2023-04-18 | 合肥联宝信息技术有限公司 | System startup control method, controller and computer readable medium |
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|---|---|
| CN101685961B (en) | 2013-10-30 |
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Application publication date: 20100331 Assignee: SHENZHEN CHUANGWEI ELECTRONIC APPLIANCE TECH CO., LTD. Assignor: Shenzhen Skyworth-RGB Electronics Co., Ltd. Contract record no.: 2015440020347 Denomination of invention: Power supply circuit of audio frequency power amplifier Granted publication date: 20131030 License type: Exclusive License Record date: 20151106 |
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