CN108055012A - Audio-frequency power amplifier - Google Patents
Audio-frequency power amplifier Download PDFInfo
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- CN108055012A CN108055012A CN201711456917.2A CN201711456917A CN108055012A CN 108055012 A CN108055012 A CN 108055012A CN 201711456917 A CN201711456917 A CN 201711456917A CN 108055012 A CN108055012 A CN 108055012A
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- 230000005236 sound signal Effects 0.000 claims abstract description 57
- 230000008859 change Effects 0.000 claims abstract description 11
- 230000005669 field effect Effects 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
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- 238000001914 filtration Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
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Classifications
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- 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
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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Abstract
The present invention provides a kind of audio-frequency power amplifiers, are related to Audio Signal Processing field.The audio-frequency power amplifier is changed the amplitude of audio signal by using analog gain unit, and the analog audio signal after change amplitude is inputted to low internal resistance buffer cell;Then audio signal is divided into two-way using signal processing unit to be exported respectively to the input terminal of the first D classes power amplifier unit, the 2nd D class power amplifier units, and the AC compounent of the audio signal per road is consistent with the AC compounent of analog audio signal, and the pressure difference of the DC component of the audio signal per road and the DC component of analog audio signal is in presetting threshold range;Electric current needed for low internal resistance buffer cell output loading connecting pin is recycled, and electric current needed for load connecting pin obtains respectively from the first D classes power amplifier unit, the 2nd D class power amplifier units, it is achieved thereby that the tonequality and efficiency of the audio signal of output.
Description
Technical field
The present invention relates to Audio Signal Processing field, in particular to a kind of audio-frequency power amplifier.
Background technology
In current audio power amplifier circuit, traditional A classes and AB analoglike power amplifiers, technology is highly developed, tonequality performance
It is very outstanding, however the technological difficulties that annoying A classes and AB class power amplifiers always are its extremely low efficiency, especially powerful A
Class and AB class power amplifiers, efficiency be even more very it is low, according to music rise and fall volume, when efficiency is minimum even less than 1%, most
High efficiency also is difficult to breakthrough 50%.The high power supply cost and heat dissipation cost, volume that poor efficiency is brought are necessarily large and bulky.Therefore exist
Powerful application scenario, such as stereo of stage, venue sound equipment and the occasion higher to volume and efficiency requirements, for example move
Dynamic equipment in Baffle Box of Bluetooth and mini loudspeaker, often uses H classes power amplifier or D class switch numbers power amplifiers.Especially D
Class power amplifier is applied widely or even has substitution tradition A classes comprehensively and the trend of AB class audio frequency power amplifiers at present.However in Hi-
Fi fields since music-lover requires harshness to tonequality, pursue high-fidelity, temporarily can not also be substituted by D classes power amplifier, still make
With the traditional A classes and AB class power amplifiers of inefficient high cost.
The main short slab of D class power amplifiers comes from the born switching characteristic of D classes.D classes are according to sound by high-frequency switch
Music signal adjusts duty cycle, and the electric current of output is by obtaining a continuous waveform after filtering, as music signal electric current, driving
Loud speaker sounding.However filtering perfect can not show original sound waveform, filtering deficiency, high frequency sawtooth and ripple are apparent,
Sound is stiff, and filtering is excessive, and phase distortion is big, and sound is dilatory fuzzy.And there are many variation of music signal power speed, D class power amplifiers
Therefore how the waveform for the various change that perfect can not coincide, causes the tonequality of D class power amplifiers and efficiency to reach balance, is current
There is the problem of to be solved.
The content of the invention
In view of this, the embodiment of the present invention is designed to provide a kind of audio-frequency power amplifier, to improve above-mentioned ask
Topic.
An embodiment of the present invention provides a kind of audio-frequency power amplifier, the audio-frequency power amplifier includes analog gain list
First, low internal resistance buffer cell, the first D classes power amplifier unit, the 2nd D classes power amplifier unit, signal processing unit and load connecting pin,
The output terminal of the analog gain unit is electrically connected with the input terminal of the low internal resistance buffer cell, the low internal resistance buffer cell
Output terminal of the output terminal respectively with the first D classes power amplifier unit, the 2nd D class power amplifier units be electrically connected, the first D
The input terminal of class power amplifier unit is electrically connected with the output terminal of the signal processing unit, the output terminal of the low internal resistance buffer cell
Also it is electrically connected with the load connecting pin;
The analog gain unit will change the analogue audio frequency after amplitude for being changed to the amplitude of audio signal
Signal is inputted to the low internal resistance buffer cell;
The signal processing unit be used for by audio signal be divided into two-way export respectively to the first D classes power amplifier unit,
The input terminal of the 2nd D class power amplifier units, and per the AC compounent of audio signal on road and exchanging for analog audio signal
Component is consistent, and the pressure difference of the DC component of the audio signal per road and the DC component of analog audio signal is in presetting threshold value
Scope;
The low internal resistance buffer cell is used for electric current needed for output loading connecting pin, wherein, needed for the load connecting pin
Electric current obtains respectively from the first D classes power amplifier unit, the 2nd D class power amplifier units.
Further, the low internal resistance buffer cell includes the first source of stable pressure (VS1), the second source of stable pressure (VS2), the 3rd surely
Potential source (VS3), the 4th source of stable pressure (VS4), the first operational amplifier (OP1), first expand flow tube, the second expansion flow tube, the first power
Amplifier tube, the second power amplifier tube, first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4),
Five resistance (R5), the 6th resistance, the 7th resistance and the first capacitance,
First source of stable pressure, second source of stable pressure are serially connected with described first and expand between flow tube, the second expansion flow tube, described
The output terminal of analog gain unit expands flow tube, the second expansion flow tube and first operational amplifier with described first respectively
Normal phase input end electrical connection, it is described first expand flow tube, it is described second expand flow tube respectively with the first operational amplifier positive electricity
Source input terminal, the electrical connection of negative supply input terminal, the inverting input of first operational amplifier respectively with the second resistance
One end, one end of the first capacitance, one end of the 5th resistance and first resistor one end electrical connection, first capacitance and institute
Second resistance electrical connection is stated, the other end of the first resistor is electrically connected with an outer counter feed point, first operational amplifier
Output terminal respectively with the other end of the second resistance, the other end of first capacitance, the 3rd source of stable pressure (VS3)
One end, one end electrical connection of the 4th source of stable pressure (VS4), the other end of the 3rd source of stable pressure (VS3), the 4th voltage stabilizing
The one end of the other end in source (VS4) respectively with one end of the 3rd resistor, the 7th resistance is electrically connected, and the one of the 3rd resistor
End, the 7th resistance the other end respectively with the first end of first power amplifier tube, second power amplifier tube
First end is electrically connected, and the 4th resistance, the 6th resistance are serially connected with the second end of first power amplifier tube, described the
Between the second end of two power amplifier tubes, the other end of the 5th resistance, the load connecting pin are serially connected with the 4th electricity
Resistance, the shared end of the 6th resistance, the 3rd end, the 3rd end of second power amplifier tube of first power amplifier tube
The output terminal with the output terminal of the first D class power amplifier units, the 2nd D class power amplifier units is electrically connected respectively.
Further, the audio-frequency power amplifier includes multiple first power amplifier tubes, multiple 3rd electricity
Resistance, multiple second power amplifier tubes and multiple 7th resistance.
Further, the first expansion flow tube, described second expand flow tube as triode.
Further, the first expansion flow tube, described second expand flow tube as field-effect tube.
Further, first power amplifier tube, second power amplifier tube are triode
Further, first power amplifier tube, second power amplifier tube are field-effect tube.
Further, first power amplifier tube is field-effect tube, second power amplifier tube is triode or institute
State that the first power amplifier tube is triode, second power amplifier tube is field-effect tube.
Further, the signal processing unit is including positive signal processing unit and/or negative signal processing unit, audio just
Signal input part and audio negative signal input terminal, the positive signal processing unit include the 5th source of stable pressure, the 6th source of stable pressure, institute
It states the 5th source of stable pressure to be electrically connected with the first D class power amplifier units, it is steady that the audio positive signal input terminal is connected to the described 5th
Potential source, the 6th source of stable pressure, the negative signal processing unit includes the 7th source of stable pressure, the 8th source of stable pressure, described
8th source of stable pressure is electrically connected with the 2nd D class power amplifier units, the audio negative signal input terminal and the 7th source of stable pressure, institute
State the shared end electrical connection of the 8th source of stable pressure.
Further, first source of stable pressure, second source of stable pressure, the 3rd source of stable pressure, the 4th source of stable pressure,
5th source of stable pressure, the 6th source of stable pressure, the 7th source of stable pressure and the 8th source of stable pressure are voltage stabilizing element or steady
Volt circuit.
Compared with prior art, audio-frequency power amplifier provided by the invention, by using analog gain unit to audio
The amplitude of signal is changed, and the analog audio signal after change amplitude is inputted to low internal resistance buffer cell;Then utilize
Audio signal is divided into two-way and is exported respectively to the input of the first D classes power amplifier unit, the 2nd D class power amplifier units by signal processing unit
End, and the AC compounent of the audio signal per road is consistent with the AC compounent of analog audio signal, the audio signal per road
The pressure difference of DC component and the DC component of analog audio signal is in presetting threshold range;Recycle low internal resistance buffer cell
Electric current needed for output loading connecting pin, and electric current needed for connecting pin is loaded respectively from the first D classes power amplifier unit, the 2nd D class power amplifiers
Unit obtains, it is achieved thereby that the tonequality and efficiency of the audio signal of output.
For the above objects, features and advantages of the present invention is enable to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.The present invention implementation being usually described and illustrated herein in the accompanying drawings
The component of example can configure to arrange and design with a variety of.Therefore, below to provide in the accompanying drawings the present invention reality
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
Every other embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the circuit diagram of audio-frequency power amplifier provided in an embodiment of the present invention.
Icon:101- analog gain units;The low internal resistance buffer cells of 102-;The first D class power amplifier units of 103-;104- second
D class power amplifier units;105- positive signal processing units;106- negative signal processing units.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can configure to arrange and design with a variety of herein.Cause
This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Go out all other embodiments obtained on the premise of creative work, belong to the scope of protection of the invention.
Referring to Fig. 1, an embodiment of the present invention provides a kind of audio-frequency power amplifier, audio-frequency power amplifier includes simulation
Gain unit 101, low internal resistance buffer cell 102, the first D classes power amplifier unit 103, the 2nd D classes power amplifier unit 104, signal processing
Unit and load connecting pin OUT.The output terminal of analog gain unit 101 and the input terminal of low internal resistance buffer cell 102 are electrically connected
It connects, the output terminal output with the first D classes power amplifier unit 103, the 2nd D classes power amplifier unit 104 respectively of low internal resistance buffer cell 102
End electrical connection.The input terminal of first D classes power amplifier unit 103 is electrically connected with the output terminal of signal processing unit, and low internal resistance buffering is single
The output terminal of member 102 is also electrically connected with load connecting pin OUT.
Analog gain unit 101 will change the analogue audio frequency after amplitude for being changed to the amplitude of audio signal
Signal is inputted to low internal resistance buffer cell 102.
Signal processing unit is exported respectively for audio signal to be divided into two-way to the first D classes power amplifier unit 103, the 2nd D
The input terminal of class power amplifier unit 104, and per the AC compounent of audio signal on road and the AC compounent one of analog audio signal
It causes, the pressure difference of the DC component of the audio signal per road and the DC component of analog audio signal is in presetting threshold range
It is interior.
Wherein, presetting threshold range should ensure the first power amplifier tube Q3 and the second normal works of power amplifier tube Q4
Make, and retain enough pressure differences to buffer the first D classes power amplifier unit 103, the 2nd D classes power amplifier unit 104 ripple and saw of itself
On the premise of the peak value of tooth, pressure difference, guaranteed efficiency, to reduce loss are reduced to the greatest extent.Due to the presence of pressure difference, the first D class power amplifiers
Unit 103, the ripple of the 2nd D classes power amplifier unit 104 and sawtooth are buffered, and eliminate the first D classes power amplifier unit 103, the 2nd D
The tonequality of class power amplifier unit 104 influences, and low internal resistance buffer cell 102 is the output circuit of a 0DB, therefore, load connection
The audio signal output waveform for holding OUT is consistent with the audio signal output waveform of analog gain unit 101.
It should be noted that the power attenuation of the audio-frequency power amplifier, the predominantly loss of analog gain unit 101,
The working loss of low internal resistance buffer cell 102, wherein, most important loss control comes from the of low internal resistance buffer cell 102
One power amplifier tube Q3, the second power amplifier tube Q4, the adjusting pressure difference that above-mentioned loss passes through are adjusted.Choose suitable
One operational amplifier increases the input resistance of low internal resistance buffer cell 102, will can reduce the design of analog gain unit 101,
Efficiency can be further improved.
Low internal resistance buffer cell 102 is used for electric current needed for the OUT of output loading connecting pin, wherein, it loads needed for the OUT of connecting pin
Electric current obtains respectively from the first D classes power amplifier unit 103, the 2nd D classes power amplifier unit 104.
Low internal resistance buffer cell 102 includes the first source of stable pressure VS1, the second source of stable pressure VS2, the 3rd source of stable pressure VS3, the 4th surely
Potential source VS4, the first operational amplifier, the first expansion flow tube Q1, the second expansion flow tube Q2, the first power amplifier tube Q3, the second power are put
Big pipe Q4, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th
Resistance R7 and the first capacitance C1.
First source of stable pressure VS1, the second source of stable pressure VS2 are serially connected between the first expansion flow tube Q1, the second expansion flow tube Q2, and simulation increases
The positive that the output terminal of beneficial unit 101 expands flow tube Q1, the second expansion flow tube Q2 and the first operational amplifier with first respectively inputs
End electrical connection, first expands flow tube Q1, the second expansion flow tube Q2 is inputted respectively with the first operational amplifier positive supply input terminal, negative supply
End electrical connection, the inverting input of the first operational amplifier respectively with one end of second resistance R2, one end of the first capacitance C1, the
One end of five resistance R5 and one end electrical connection of first resistor R1, the first capacitance C1 are electrically connected with second resistance R2, the first electricity
The other end of resistance R1 is electrically connected with an outer counter feed point EX-FB, the output terminal of the first operational amplifier respectively with second resistance R2
The other end, the other end of the first capacitance C1, one end of the 3rd source of stable pressure VS3, the 4th source of stable pressure VS4 one end electrical connection, the
The other end of three source of stable pressure VS3, the other end of the 4th source of stable pressure VS4 respectively with one end of 3rd resistor R3, the 7th resistance R7
One end be electrically connected, one end of 3rd resistor R3, the 7th resistance R7 the other end respectively with the first end of the first power amplifier tube Q3,
The first end electrical connection of second power amplifier tube Q4, the 4th resistance R4, the 6th resistance R6 are serially connected with the first power amplifier tube Q3's
Between second end, the second end of the second power amplifier tube Q4, the other end of the 5th resistance R5, load connecting pin OUT are serially connected with the
Four resistance R4, the shared end of the 6th resistance R6, the 3rd end, the 3rd end of the second power amplifier tube Q4 of the first power amplifier tube Q3
The output terminal with the output terminal of the first D classes power amplifier unit 103, the 2nd D classes power amplifier unit 104 is electrically connected respectively.
Wherein, audio-frequency power amplifier can include multiple first power amplifier tube Q3, multiple 3rd resistors
R3, multiple second power amplifier tube Q4 and multiple 7th resistance, first expands flow tube Q1, the second expansion flow tube is triode
Q2;Or first expands flow tube Q1, the second expansion flow tube Q2 is field-effect tube.
First power amplifier tube Q3, the second power amplifier tube Q4 are triode;Or the first power amplifier tube Q3, the second work(
Rate amplifier tube Q4 is field-effect tube;Or first power amplifier tube Q3 be field-effect tube, the second power amplifier tube Q4 is triode;
Or first power amplifier tube Q3 be triode, the second power amplifier tube Q4 is field-effect tube.
Signal processing unit includes positive signal processing unit 105 and/or negative signal processing unit 106, audio positive signal are defeated
Entering end and audio negative signal input terminal, positive signal processing unit 105 includes the 5th source of stable pressure VS5, the 6th source of stable pressure VS6, the
Five source of stable pressure VS5 are electrically connected with the first D classes power amplifier unit 103, and audio positive signal input terminal is connected to the 5th source of stable pressure VS5,
Six source of stable pressure VS6, negative signal processing unit 106 include the 7th source of stable pressure VS7, the 8th source of stable pressure VS8, the 8th source of stable pressure VS8 with
2nd D classes power amplifier unit 104 is electrically connected, and audio negative signal input terminal and the 7th source of stable pressure VS7, the 8th source of stable pressure VS8 are shared
End electrical connection.Wherein, the 5th source of stable pressure VS5 is electrically connected with the normal phase input end of the first D classes power amplifier unit 103, the 6th source of stable pressure
VS6 is electrically connected with the normal phase input end of the 2nd D classes power amplifier unit 104, the 7th source of stable pressure VS7 and the first D classes power amplifier unit 103
Negative-phase input is electrically connected, and the 8th source of stable pressure VS8 is electrically connected with the negative-phase input of the 2nd D classes power amplifier unit 104, and first is steady
Potential source VS1, the second source of stable pressure VS2, the 3rd source of stable pressure VS3, the 4th source of stable pressure VS4, the 5th source of stable pressure VS5, the 6th source of stable pressure
VS6, the 7th source of stable pressure VS7 and the 8th source of stable pressure VS8 are voltage stabilizing element or regulator circuit.
The operation principle of the audio-frequency power amplifier is:It is divided into three road of audio signal to input simultaneously:
The first via:When analog audio signal is input to analog gain unit 101, the amplitude of audio signal is changed, and
It is exported from 101 output terminal of analog gain unit, to adjust the size of volume, by adjusting the first source of stable pressure VS1, the second source of stable pressure
The size of VS2 can adjust the operating voltage of the first operational amplifier, so that the first operational amplifier is operated in optimum voltage
Under, reduce distortion.The common mode distortion of the first operational amplifier has been greatly reduced simultaneously.First expands flow tube Q1, the second expansion flow tube
Q2, the continuous dynamic change when the current needs of the first operational amplifier change with music, since first expand flow tube Q1, second expands
The presence of flow tube Q2 so that electric current supply is more stable.The audio signal of upper level is from the normal phase input end of the first operational amplifier
Input is exported from the output terminal of the first operational amplifier.The signal exported from the output terminal of the first operational amplifier passes through the 3rd
Source of stable pressure VS3, the 4th source of stable pressure VS4 are input to the first power amplifier tube as coupling by 3rd resistor R3, the 7th resistance R7
The grid of Q3, the second power amplifier tube Q4.First power amplifier tube Q3, the second power amplifier tube Q4 are connected with push pull mode from load
End OUT outputs are connect, so as to driving load.
Second tunnel:Positive signal processing unit 105 exports the Audio Signal Processing of input for two-way, with the 5th source of stable pressure
VS5 and the 5th source of stable pressure VS5 is signal deviant, the two-way audio signal of output, AC compounent and former analog audio signal one
It causes, DC component is different;
3rd tunnel:Negative signal processing unit 106 exports the Audio Signal Processing of input for two-way, with the 5th source of stable pressure
VS5 and the 6th source of stable pressure VS6 is signal deviant, the two-way audio signal of output, AC compounent and former analog audio signal one
It causes, DC component is different.
In the present embodiment, because of the presence of second resistance R2, the 5th resistance R5 and the first capacitance C1, by the first operation amplifier
Device is the circuit that the low internal resistance buffer cell 102 of core is 0 gain of a complete negative-feedback.Therefore load connecting pin OUT and
The signal waveform of normal phase input end is consistent with amplitude, and low internal resistance buffer cell 102 exports the electric current needed for load, from negative
Connecting pin OUT outputs are carried, this electric current is obtained from the drain electrode of the first power amplifier tube Q3 and the second power amplifier tube Q4, and is supplied to
The electric current of drain electrode, and be to be obtained respectively from the first D classes power amplifier unit 103, the 2nd D classes power amplifier unit 104.I.e. by the first D class work(
The exports audio signal of unit 103, the 2nd D classes power amplifier unit 104 is put as power supply supply use, is supplied to low internal resistance buffering
Unit 102, and the output of low internal resistance buffer cell 102 is controlled completely by analog gain stage.Low internal resistance buffer stage unit is very big
Ground improves the performance of Buffer output, high resistant input, low-resistance output, low distortion, so as to by selecting low power operation amplifier
Device can be obtained in large-power occasions and low-power device equally accurately exports, and makes high-power, high-performance and high-precision simultaneously
It realizes.
In conclusion audio-frequency power amplifier provided by the invention, by using analog gain unit to audio signal
Amplitude is changed, and the analog audio signal after change amplitude is inputted to low internal resistance buffer cell;Then using at signal
Audio signal is divided into two-way and is exported respectively to the input terminal of the first D classes power amplifier unit, the 2nd D class power amplifier units by reason unit, and
And the AC compounent of the audio signal per road is consistent with the AC compounent of analog audio signal, the direct current point of the audio signal per road
The pressure difference of amount and the DC component of analog audio signal is in presetting threshold range;Recycle low internal resistance buffer cell output negative
Electric current needed for connecting pin is carried, and electric current needed for load connecting pin obtains respectively from the first D classes power amplifier unit, the 2nd D class power amplifier units
, it is achieved thereby that the tonequality and efficiency of the audio signal of output.
Each function module in each embodiment of the present invention can integrate to form an independent part, also may be used
To be modules individualism, can also two or more modules be integrated to form an independent part.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.It should be noted that:Similar label and letter exists
Similar terms is represented in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, is then not required in subsequent attached drawing
It is further defined and is explained.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention described should be subject to the protection scope in claims.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
Also there are other identical elements in process, method, article or equipment including the element.
Claims (10)
1. a kind of audio-frequency power amplifier, which is characterized in that the audio-frequency power amplifier includes analog gain unit, low internal resistance
Buffer cell, the first D classes power amplifier unit, the 2nd D classes power amplifier unit, signal processing unit and load connecting pin, the simulation
The output terminal of gain unit is electrically connected with the input terminal of the low internal resistance buffer cell, the output terminal of the low internal resistance buffer cell
The output terminal with the first D classes power amplifier unit, the 2nd D class power amplifier units is electrically connected respectively, the first D class power amplifier lists
The input terminal of member is electrically connected with the output terminal of the signal processing unit, the output terminal of the low internal resistance buffer cell also with it is described
Load connecting pin electrical connection;
The analog gain unit will change the analog audio signal after amplitude for being changed to the amplitude of audio signal
It inputs to the low internal resistance buffer cell;
The signal processing unit, which is used to audio signal being divided into two-way, to be exported respectively to the first D classes power amplifier unit, described
The input terminal of 2nd D class power amplifier units, and per the AC compounent of audio signal on road and the AC compounent of analog audio signal
Unanimously, the pressure difference of the DC component of the DC component and analog audio signal of the audio signal per road is in presetting threshold value model
It encloses;
The low internal resistance buffer cell is used for electric current needed for output loading connecting pin, wherein, electric current needed for the load connecting pin
It is obtained respectively from the first D classes power amplifier unit, the 2nd D class power amplifier units.
2. audio-frequency power amplifier according to claim 1, which is characterized in that the low internal resistance buffer cell includes first
Source of stable pressure, the second source of stable pressure, the 3rd source of stable pressure, the 4th source of stable pressure, the first operational amplifier, first expand flow tube, second expand flow tube,
First power amplifier tube, the second power amplifier tube, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
Six resistance, the 7th resistance and the first capacitance,
First source of stable pressure, second source of stable pressure are serially connected with described first and expand between flow tube, the second expansion flow tube, the simulation
The output terminal of gain unit is expanding flow tube, the second expansion flow tube and first operational amplifier just with described first respectively
Phase input terminal is electrically connected, and the first expansion flow tube, the second expansion flow tube are defeated with the first operational amplifier positive supply respectively
Enter end, the electrical connection of negative supply input terminal, the inverting input of first operational amplifier respectively with the second resistance one
End, one end electrical connection of one end of the first capacitance, one end of the 5th resistance and first resistor, first capacitance and described the
Two resistance are electrically connected, and the other end of the first resistor is electrically connected with an outer counter feed point, first operational amplifier it is defeated
Outlet respectively with the other end of the second resistance, the other end of first capacitance, the 3rd source of stable pressure one end, described
4th source of stable pressure one end electrical connection, the other end of the 3rd source of stable pressure, the other end of the 4th source of stable pressure respectively with institute
State one end electrical connection of one end, the 7th resistance of 3rd resistor, one end of the 3rd resistor, the other end of the 7th resistance
The first end with the first end of first power amplifier tube, second power amplifier tube is electrically connected respectively, the 4th electricity
Resistance, the 6th resistance be serially connected with the second end of first power amplifier tube, the second end of second power amplifier tube it
Between, the other end of the 5th resistance, it is described load connecting pin be serially connected with the 4th resistance, the 6th resistance share
End, the 3rd end of first power amplifier tube, the 3rd end of second power amplifier tube respectively with the first D class power amplifiers
The output terminal electrical connection of the output terminal of unit, the 2nd D class power amplifier units.
3. audio-frequency power amplifier according to claim 2, which is characterized in that the audio-frequency power amplifier includes multiple
First power amplifier tube, multiple 3rd resistors, multiple second power amplifier tubes and multiple 7th resistance.
4. audio-frequency power amplifier according to claim 2, which is characterized in that described first expands flow tube, second expansion
Flow tube is triode.
5. audio-frequency power amplifier according to claim 2, which is characterized in that described first expands flow tube, second expansion
Flow tube is field-effect tube.
6. audio-frequency power amplifier according to claim 2, which is characterized in that first power amplifier tube, described
Two power amplifier tubes are triode.
7. audio-frequency power amplifier according to claim 2, which is characterized in that first power amplifier tube, described
Two power amplifier tubes are field-effect tube.
8. audio-frequency power amplifier according to claim 2, which is characterized in that first power amplifier tube is field-effect
Pipe, second power amplifier tube is triode or first power amplifier tube is triode, second power amplifier tube
For field-effect tube.
9. audio-frequency power amplifier according to claim 2, which is characterized in that the signal processing unit includes positive signal
Processing unit and/or negative signal processing unit, audio positive signal input terminal and audio negative signal input terminal, at the positive signal
Managing unit includes the 5th source of stable pressure, the 6th source of stable pressure, and the 5th source of stable pressure is electrically connected with the first D class power amplifier units, institute
It states audio positive signal input terminal and is connected to the 5th source of stable pressure, the 6th source of stable pressure, the negative signal processing unit includes
7th source of stable pressure, the 8th source of stable pressure, the 8th source of stable pressure are electrically connected with the 2nd D class power amplifier units, and the audio bears letter
Number input terminal is electrically connected with the shared end of the 7th source of stable pressure, the 8th source of stable pressure.
10. audio-frequency power amplifier according to claim 9, which is characterized in that first source of stable pressure, described second are surely
Potential source, the 3rd source of stable pressure, the 4th source of stable pressure, the 5th source of stable pressure, the 6th source of stable pressure, the 7th voltage stabilizing
Source and the 8th source of stable pressure are voltage stabilizing element or regulator circuit.
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