CN106208973B - Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers - Google Patents
Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers Download PDFInfo
- Publication number
- CN106208973B CN106208973B CN201610715463.5A CN201610715463A CN106208973B CN 106208973 B CN106208973 B CN 106208973B CN 201610715463 A CN201610715463 A CN 201610715463A CN 106208973 B CN106208973 B CN 106208973B
- Authority
- CN
- China
- Prior art keywords
- circuit
- audio
- voltage
- audio signal
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005236 sound signal Effects 0.000 claims abstract description 183
- 230000003321 amplification Effects 0.000 claims abstract description 90
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 90
- 230000008859 change Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 10
- 230000010349 pulsation Effects 0.000 claims description 50
- 238000006243 chemical reaction Methods 0.000 claims description 32
- 230000003111 delayed effect Effects 0.000 claims description 20
- 230000033228 biological regulation Effects 0.000 claims description 15
- 238000011282 treatment Methods 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 13
- 230000001934 delay Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000004088 simulation Methods 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- FPIPGXGPPPQFEQ-OVSJKPMPSA-N all-trans-retinol Chemical compound OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-OVSJKPMPSA-N 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 235000019169 all-trans-retinol Nutrition 0.000 description 1
- 239000011717 all-trans-retinol Substances 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Abstract
Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers.Advanced servo-actuated biasing means are to need the audio signal amplified to enter line delay and using the simulated audio signal corresponding to the audio signal after time delay as the audio signal amplified the need for input power amplifier to selection, meanwhile, the simulated audio signal corresponding to the audio signal of needs amplification will be selected to be used to control to produce the biasing with the change of time delay audio signal amplitude and make power amplification output circuit in A class working conditions.Amplifier includes voltage or current biasing circuit, full-wave rectifying circuit, amplitude holding circuit, change-over circuit and Audio power amplifier output circuit, also including delay circuit, it is necessary to the audio letter laggard Audio power amplifier output circuit of time delay for amplifying；The corresponding simulated audio signal of the audio amplified letter is needed by being used for the output of the bias voltage or bias current of control voltage or current biasing circuit after processing of circuit.It is of the invention to reduce biasing in good time to realize reducing power consumption.
Description
Technical field
The present invention relates to Audio power amplifier field, and in particular to a kind of the advanced of A genus audio power amplifiers is servo-actuated partially
Put method and the A genus audio power amplifiers using the method.
Background technology
At present, with the development of multimedia technology, home audio power amplifier, power professional audio amplifier, automobile
Sound system audio power amplifier, portable multimedia apparatus audio-frequency power amplifier all developing rapidly, can be divided into A, B, AB,
The types such as D, G, H.
Wherein, B genus audio power amplifiers, power amplification efferent duct has the time of half to be in the whole signal period
Cut-off, although theoretic efficiency has serious intermodulation distortion up to 78.5%, and playback sound is very bad；AB classes
Audio-frequency power amplifier, power amplification efferent duct is full conducting in middle small-signal, is worked in the way of A classes, in big signal
When be half conducting, efficiency is up to more than 50%, and good design, playback sound is pretty good, is to use most types at present, but still
So there are problems that intermodulation distortion, high frequency distortion is linearly not good enough also than larger；D-type audio power amplifier, is with on-off mode
Work, efficiency high is up to more than 90%, but tonequality is bad, is used in less demanding tonequality, pursuit efficiency, the occasion of compact；
G classes and H genus audio power amplifiers, are worked in the way of A classes, AB classes, and efficiency is improved by Switching power voltage, and efficiency surpasses
More than 50% is crossed, but circuit is complicated, it is relatively costly, and easily produce dynamic distortion.
And A genus audio power amplifiers, power amplification efferent duct is continuously turned in the whole signal period, does not have friendship to get over
Distortion, static distortion and dynamic distortion all very littles, linearly very good, the music that can best reset is with guarantee tonequality, sense of hearing
Best.Generally, in order to occur without amplitude limit, the static working current of A class power amplification efferent ducts is chosen to be maximum defeated
Go out the 50% of electric current, this to analog circuit in it is linear most beneficial, but no matter need to amplify either with or without audio signal input, phase
When the twice in rated power has all consumed the cooling system, it is necessary to too fat to move to silent.In A class audio frequency power amplifications
In device, the efficiency of simplest Single-end output circuit is 12.5%, and the efficiency of totem pole has 50%, and this needs is lasting
Sine wave total power is exported and load impedance is optimized and can be only achieved.But, the peak value of music signal, i.e. audio signal with it is average
Value is than what is always changed, and signal is also frequent asymmetric, efficiency in actual applications, always very low compared with theoretical value
, 1/4~1/5 appearance is generally obtained, for example, the efficiency of Single-end output circuit is 2.5% in practice, push-pull type is defeated
The efficiency for going out circuit is 10% or so.So, typical A genus audio power amplifiers have that many caloric values of power consumption are big, weight is big
Price fatal defects high, except some applications in the not discounted recording studio of the high-fidelity music center and minority of a few high-end
In addition, other applications seldom, are even more difficult to popularize.
Because A genus audio power amplifiers have the generally acknowledged good pleasing to the ear sense of tonequality, and structure is relatively easy, so much
The designer of audio-frequency power amplifier is constantly directed to A genus audio power amplifiers, is carried out with tonequality is improved around efficiency is improved
Some design compromises, it is desirable to obtain more performance in a balanced way.It is common to have slip biasing, dynamic bias, in real time biasing, lasting height
The form such as biasing or super A classes, these form ingenuity are original, but generally existing improves problem coarse, that improvement is limited, especially
It is to set up these biasings and adjustment voltage or electric current to take more time, hence it is evident that lag behind input signal, generate more
Distortion, lose the good pleasing to the ear sense of tonequality of real A genus audio power amplifiers, be more also size and the biasing of biasing
Duration is improper, and efficiency improves unobvious.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of biasing means servo-actuated in advance of A genus audio power amplifiers
And amplifier, it can not only be readily apparent that to improve the operating efficiency of A genus audio power amplifiers, and can give full play to
The advantage of audio-frequency power amplifier, i.e. distortion very little, linear fine, sense of hearing are optimal, are fully ensuring that amplifier in the work of A classes
On the premise of state, the quiescent current of power amplification output circuit is reduced in time to reduce biasing, to realize reducing power consumption.
The present invention is adopted the following technical scheme that：
A kind of biasing means servo-actuated in advance of A genus audio power amplifiers of the present invention, need what is amplified to selection
Audio signal enters line delay and using the simulated audio signal corresponding to the audio signal after time delay as input power amplifier
The audio signal amplified is needed, meanwhile, will select to need the simulated audio signal corresponding to the audio signal amplified as being used for
The advanced AC bias control signal of control voltage biasing circuit or current biasing circuit, and produced with prolonging by processing of circuit
When the need for the bias voltage or bias current of the amplitude change of audio signal that amplify, and described bias voltage or biased electrical
Flow the audio signal for supplying power amplification output circuit and making power amplification output circuit amplify the need for being in corresponding time delay
Required A class working conditions.
The present invention can take following technical measures to realize the further optimization of the advanced servo-actuated biasing means：
Before the audio signal input power amplification output circuit amplified the need for the time delay, sequentially amplify through Audio Buffer
Circuit, digital volume regulation circuit and the treatment of audio voltage amplifying circuit, the Audio Buffer amplifying circuit, for audio signal
Impedance matching and voltage amplification；The digital volume adjusts circuit, and volume is listened to for adjusting；The audio voltage amplifies electricity
Road, for the voltage amplification of audio signal.
The bias voltage or inclined changed with the amplitude of the audio signal amplified the need for time delay is produced by processing of circuit
The circuit process method for putting electric current is as follows：Full-wave rectification is carried out to advanced AC bias control signal and obtains bias control signal
Absolute value, form advanced pulsation bias control signal, then be used for by being formed after amplitude holding circuit and change-over circuit treatment
The bias control signal servo-actuated in advance of control voltage or current biasing circuit, voltage or current biasing circuit are according to advanced servo-actuated inclined
Put control signal and produce the bias voltage or bias current changed with the amplitude of the audio signal of time delay；Wherein, amplitude keeps
Circuit is used to ensure that power amplification output circuit can be operated reliably at A class working conditions, when input amplitude holding circuit
The amplitude of advanced pulsation bias control signal is relative to become hour, and amplitude holding circuit delays the advanced arteries and veins that amplitude holding circuit is exported
The magnitude of voltage of dynamic slow drop bias control signal declines, when the amplitude of the advanced pulsation bias control signal of input amplitude holding circuit
When becoming big relatively, the magnitude of voltage moment rising of drop bias control signal is delayed in the advanced pulsation of amplitude holding circuit output；Conversion electricity
Road be used for will the advanced slow drop bias control signal of pulsation according to being carried out the need for biasing circuit with mutually or anti-phase conversion or adjustment width
Value, is allowed to be converted into the bias control signal servo-actuated in advance that amplitude is adapted to voltage or current biasing circuit.
It can be simulated audio signal, or digital audio and video signals, Ke Yifen that selection needs the audio signal amplified
Do not processed using following methods：
It is simulated audio signal that selection needs the audio signal amplified, then enter line delay using analog signal delay circuit.
It is simulated audio signal that selection needs the audio signal amplified, then after analog-to-digital conversion is carried out to analog signal, then
Using digital audio and video signals delay circuit time delay, most it is converted into through D/A converting circuit inputing to power amplification output circuit afterwards
The audio signal amplified the need for time delay.
It is digital audio and video signals that selection needs the audio signal amplified, then delayed using digital audio and video signals delay circuit,
Reuse the need for digital audio and video signals to be converted into inputing to D/A converting circuit the time delay of power amplification output circuit and amplify
Audio signal, meanwhile, will select to need the digital audio and video signals for amplifying to be converted into simulated audio signal and advanced for producing
Servo-actuated bias control signal.
A kind of amplifier of the present invention, including voltage or current biasing circuit, full-wave rectifying circuit, amplitude keep electricity
Road, change-over circuit and Audio power amplifier output circuit, the Audio power amplifier output circuit is used to receive needs what is amplified
Simulated audio signal corresponding to audio signal, and it is described need amplify audio signal corresponding to simulated audio signal be used for
The advanced AC bias control signal of control voltage or current biasing circuit is produced, the voltage or current biasing circuit are sound
Frequency power amplification output circuit provides bias voltage or bias current, and the amplifier also includes delay circuit, and audio power
Amplification output circuit is received needs the audio amplified to believe after the delay circuit time delay into Audio power amplifier output electricity
Road；The corresponding simulated audio signal of the audio letter for needing to amplify is by full-wave rectifying circuit, amplitude holding circuit and partially
Servo-actuated bias control signal in advance is produced after putting voltage conversion circuit, bias control signal from voltage or current offset is servo-actuated in advance
The control signal input input and the output of the bias voltage or bias current of control voltage or current biasing circuit of circuit；Institute
Full-wave rectifying circuit is stated for carrying out full-wave rectification to advanced AC bias control signal, the absolute of bias control signal is obtained
Value, forms advanced pulsation bias control signal；Described amplitude holding circuit ensures that power amplification circuit works in A for generation
Class working condition, hour, amplitude are become when the amplitude of the advanced pulsation bias control signal for being input into the amplitude holding circuit is relative
Holding circuit delays the advanced servo-actuated slow magnitude of voltage for dropping bias control signal that amplitude holding circuit is exported to decline, when input amplitude
When the relative change of amplitude of the advanced servo-actuated bias control signal of holding circuit is big, the advanced servo-actuated slow of amplitude holding circuit output drops
The magnitude of voltage moment of bias control signal rises；Described bias voltage change-over circuit is used to carry out pulsation bias control signal
Convert and adjust amplitude with anti-phase with phase, be allowed to be converted into the suitable voltage of amplitude or the advanced of current biasing circuit needs is servo-actuated
Bias control signal.
The present invention can take following technical measures to realize the further optimization of the amplifier：
The amplitude holding circuit is made up of electric capacity C24, resistance R29 and operational amplifier U7A, and its input with it is complete
Ripple rectification circuit is connected, and output end is connected with change-over circuit；Wherein electric capacity is used to keep the voltage of input not decline, and resistance is used for
Release electric energy.
The amplifier includes Audio Buffer amplifying circuit, digital volume regulation circuit and audio voltage amplifying circuit, institute
Audio Buffer amplifying circuit is stated for carrying out impedance matching and voltage amplification, institute to the simulated audio signal after delay circuit time delay
Stating digital volume regulation circuit is used to that the simulated audio signal after the treatment of Audio Buffer amplifying circuit listen to the tune of volume
Section, the audio voltage amplifying circuit is put for carrying out voltage to the simulated audio signal after digital volume regulation processing of circuit
Greatly, the simulated audio signal after voltage amplification as Audio power amplifier output circuit input signal.
It is analog signal to need the audio signal amplified, and delay circuit is digital audio and video signals delay circuit and is put described
Analog to digital conversion circuit and D/A converting circuit 104,106, the simulation letter of audio signal input selection circuit output are set in big device
Number by forming digital audio and video signals after analog to digital conversion circuit conversion, the digital audio and video signals warp of analog-digital conversion circuit as described output
Advanced AC bias control signal is formed after crossing D/A converting circuit treatment, meanwhile, the number of analog-digital conversion circuit as described output
Word audio signal forms simulated audio signal simultaneously after being changed through the time delay of digital audio and video signals delay circuit and through D/A converting circuit
As the input signal of Audio power amplifier output circuit.
The audio signal for needing the audio signal amplified can also be data signal, and delay circuit prolongs for digital audio and video signals
When circuit.
Compared with prior art, the present invention has the advantages that：
After selection needs the audio signal amplified, the present invention fits the selected audio signal for needing to amplify
When transmission delay obtain time delay audio signal, while directly by it is selected need amplify audio signal（I.e. without biography
The audio signal of defeated time delay）As AC bias control signal；Then, the audio signal of time delay is by buffering, voltage amplification etc.
After treatment, being finally transferred to power amplification output circuit carries out power amplification；And AC bias control signal is through full-wave rectification, width
The treatment of the circuit such as value holding and conversion, the biasing required for obtaining the power amplification output circuit of A genus audio power amplifiers
Voltage or bias current.
Wherein, bias control signal, bias voltage or bias current are advanced compared with the audio signal through time delay
, advanced bias control signal, advanced bias voltage or advanced bias current can be referred to as；Meanwhile, biasing control
The source of signal is exactly audio signal, the audio signal with time delay, i.e., through the audio signal of power amplification be afterwards most corresponding, and
And be each sound channel signal be it is corresponding, so the amplitude of bias voltage or bias current be with time delay audio believe
Number amplitude change according to certain ratio, be servo-actuated, through conventional circuit design, bias voltage can be caused completely
Or the amplitude of bias current meet the audio signal of corresponding time delay needed for A class working conditions requirement.Therefore, it can claim this
The bias voltage or bias current of sample are servo-actuated bias voltage or in advance servo-actuated bias current in advance, can claim such biasing side
Formula is advanced servo-actuated bias mode.
AC bias control signal enters amplitude holding circuit, amplitude after obtaining pulsation bias control signal through full-wave rectification
Holding circuit has delayed the slow drop bias control signal of advanced pulsation by the voltage holding effect of electric capacity and the discharge process of resistance
Voltage decline, if at this time there is the lower pulsation bias control signal of amplitude, i.e. musical sound is smaller, due to all-wave
The unilateral diode of rectification circuit can only be to be unable to resorption electric current to amplitude holding circuit submitting electric current to next stage circuit, this
Lower pulsation bias control signal immediately cannot drag down amplitude above high, guarantee big signal reliability above
Ground continues to complete power amplification in the state of A classes, only waits until that the bias control signal of amplitude is slow and is even lower, that is, delay and drop to
After bias control signal less than above-mentioned low amplitude value, the bias control signal of low amplitude value controls letter with the biasing of original amplitude
Number to compare and just uprise, amplitude holding circuit could be entered and the amplitude of oneself is formed；If at this time there is higher magnitude
Bias control signal, i.e., musical sound is larger, it becomes possible to immediately enters amplitude holding circuit and draws high amplitude and form new
Amplitude, and holding is that hold-off voltage declines, guaranteeing new big signal has advanced and enough big amount of bias to enter A classes
State.It can be seen that amplitude holding circuit can allow amplitude higher to keep i.e. hold-off voltage to decline all the time, that is never allow big
The biasing amplitude of signal is not enough and offset time is not enough, and the amplitude of the bias control signal of big signal obtains certain time delay,
It is advanced plus bias control signal, offset time in advance will not be delayed, and suitably continue for some times, this is allowed for
The amplitude size and time width of bias voltage or bias current are fully able to ensure that corresponding audio signal is reliably operated in
In the range of its A class working conditions.
Referring to Figure 10 and Figure 11, this is the oscillogram obtained with double track digital oscilloscopes, be embodiment 3 one kind it is advanced with
Advanced pulsation during dynamic biasing A class earphone power amplifier normal works is delayed drop bias control signal and is believed with the analogue audio frequency of time delay
Number oscillogram, from the figure, it can be seen that the slow drop bias control signal of advanced pulsation always correspond to the analogue audio frequency letter of time delay
Number advanced several milliseconds of times, servo-actuatedly for power amplification output circuit provides bias control signal, can ensure to be all of audio
Signal provides enough biasing, also can in time reduce biasing and reducing the quiescent current of power amplification output circuit reduces work(
Consumption.It can be seen that, the present invention has obtained the checking of side circuit.
Particularly advantage of the invention is：
First, by the transmission delay of the audio signal to needing to amplify, and to the suitable treatments of bias control signal, make
The amplitude size and time width for obtaining bias voltage or bias current are fully able to ensure that corresponding audio signal reliably works
In the range of its A class working conditions, it is fully able to allow power amplification output circuit correspondence just to believe in the audio of power amplification
Number, A class working conditions truly in advance, are reliably operated in, thoroughly overcome the next distortion of common variable bias hysteresis band and ask
Topic.So, audio-frequency power amplifier of the invention is real A genus audio power amplifiers, can give full play to A class audio frequency work(
The optimal advantage of rate amplifier distortion very little, linear fine, sense of hearing.
2nd, the sound amplified the need for the audio signal that needs are videlicet amplified in the source of bias control signal, with time delay
Frequency signal, that is, the audio signal for eventually passing power amplification is corresponding, and be each sound channel signal be it is corresponding,
So the amplitude of bias voltage or bias current is as the amplitude of the audio signal of time delay changes according to certain ratio,
It is servo-actuated, has music just to have biasing, the very low bias state of conducting is held only in during without music, so, A class audio frequency work(
The quiescent bias current of rate amplifier is used in audio amplification, is not wasted；According to the servo-actuated of bias control signal
Feature, i.e., loud then big biasing, the then small biasing of small sound, noiseless then extremely low biasing, and during people's listening music under normal circumstances not
Big volume can be listened, and also has pause between program, music is even more size power and constantly varies, the peak value of audio signal
With average value than what is always changed, signal is also often asymmetric, and these situations are compared with existing A power-like amplifiers
Compared with, electricity consumption seldom, can save much more electric energy when the small sound of music or no music, and no longer as existing A classes power is put
Big device is like that, unalterable in order to occur without amplitude limit is chosen to be the static working current of efferent duct maximum output current 50%
Consume electricity and waste electricity.So, the node measure that audio-frequency power amplifier of the invention is used is highly effective, and efficiency is carried
Height is obvious.
Brief description of the drawings
The circuit block diagram of the embodiment 1 of Fig. 1 A genus audio power amplifiers of the invention；
The circuit block diagram of the embodiment 2 of Fig. 2 A genus audio power amplifiers of the invention；
The circuit theory diagrams Part I of the embodiment 3 of Fig. 3 A genus audio power amplifiers of the invention（Including：Digital sound
Frequency signal delay circuit, bias control signal D/A converting circuit, audio signal D/A converting circuit）；
The circuit theory diagrams Part II of the embodiment 3 of Fig. 4 A genus audio power amplifiers of the invention（Including：Digital sound
Amount regulation circuit, voltage amplifier circuit, full-wave rectifying circuit, amplitude holding circuit, change-over circuit, current biasing circuit, power
Output circuit）；
The audio signal and power amplification output circuit of 1KHz sine waves are input into Fig. 5 simulation softwares testing example 3
The relation of quiescent current, output current（0.0V peak values）；
The audio signal and power amplification output circuit of 1KHz sine waves are input into Fig. 6 simulation softwares testing example 3
The relation of quiescent current, output current（0.5V peak values）；
The audio signal and power amplification output circuit of 1KHz sine waves are input into Fig. 7 simulation softwares testing example 3
The relation of quiescent current, output current（1.0V peak values）；
The audio signal and power amplification output circuit of 1KHz sine waves are input into Fig. 8 simulation softwares testing example 3
The relation of quiescent current, output current（2.0V peak values）；
The audio signal and power amplification output circuit of 1KHz sine waves are input into Fig. 9 simulation softwares testing example 3
The relation of quiescent current, output current（6.0V peak values）；
The audio of drop bias control signal and time delay is delayed in advanced pulsation during the side circuit normal work of Figure 10 embodiments 3
The oscillogram of signal（Signal one）；
The audio of drop bias control signal and time delay is delayed in advanced pulsation during the side circuit normal work of Figure 11 embodiments 3
The oscillogram of signal（Signal two）.
Specific embodiment
Embodiment 1
Referring to Fig. 1, a kind of A genus audio power amplifiers, using biasing means servo-actuated in advance of the present invention, its bag
Include：Audio signal input selection circuit 101, D/A converting circuit 102, S/PDIF receiving circuits 110, IIS input selection circuits
103, audio signal delay circuit 108, bias control signal D/A converting circuit 104, audio signal D/A converting circuit 106,
Audio Buffer/amplifying circuit 105, digital volume regulation circuit 107, audio voltage amplifying circuit 109, full-wave rectifying circuit 115,
Amplitude holding circuit 114, change-over circuit 113, voltage or current biasing circuit 112, A class audio frequencies power amplification output circuit 111；
Other compositions of A genus audio power amplifiers unrelated to the invention, for example：Power supply circuit, display circuit, control electricity
Road, audio effect processing, protection circuit etc., just do not repeat herein.
The function of each several part circuit or effect are as follows respectively：
Audio signal input selection circuit 101, for selecting the audio signal to be listened to；
Analog to digital conversion circuit 102, for selected simulated audio signal to be changed, becomes corresponding DAB letter
Number, to carry out digital delay；
S/PDIF receiving circuits 110, for receiving the digital audio and video signals of S/PDIF forms, and are converted to IIS forms
Digital audio and video signals；
IIS input selection circuits 103, for selecting the IIS as obtained by simulated audio signal through analog to digital conversion circuit conversion
Digital audio and video signals, or selection IIS digital audio and video signals as obtained by S/PDIF is received；
Audio signal delay circuit 108, the transmission for postponing digital audio and video signals, so as to bias voltage or bias current
Power amplification output circuit can be made just can in advance enter A class working conditions before the arrival of corresponding audio signal, keep away
Exempt from biasing delayed；
Bias control signal D/A converting circuit 104, for no-delay digital audio and video signals to be converted into biasing circuit
Required analog signal, that is, be converted into advanced AC bias control signal；It is simultaneously synchronous to DAC cores when volume is listened in regulation
Appropriate decay volume, the i.e. level adjustment of piece operation, makes bias control signal change with the size of audio signal amplitude, from
And obtain suitable servo-actuated biasing；
Audio signal D/A converting circuit 106, for the mould needed for being converted into listening to through the digital audio and video signals of time delay
Intend audio signal, that is, be converted into the simulated audio signal of time delay；
Audio Buffer/amplifying circuit 105, for the impedance matching and voltage amplification of audio signal；
Digital volume adjusts circuit 107, and volume is listened to for adjusting；
Audio voltage amplifying circuit 109, for the voltage amplification of audio signal, is allowed to appropriate power amplification；
Full-wave rectifying circuit 115, for carrying out full-wave rectification to AC bias control signal, obtains bias control signal
Absolute value, forms advanced pulsation bias control signal；
Amplitude holding circuit 114, the amplitude for keeping pulsation bias control signal delays its voltage to decline, and can allow all the time
Amplitude holding higher be hold-off voltage decline, that is never allow big signal biasing amplitude not enough and offset time not
Foot, the amplitude of bias control signal obtains certain time delay, and it is advanced to add bias control signal, and offset time is in advance not
Can be delayed, and some times are suitably continue for, this allows for the amplitude size and time width of bias voltage or bias current
It is fully able to ensure that corresponding audio signal is reliably operated in the range of its A class working conditions.
Change-over circuit 113, for pulsation bias control signal to be carried out with phase or anti-phase conversion, or carries out appropriate amplification
Or decay, it is allowed to be converted into the control signal of biasing circuit；
Voltage or current biasing circuit 112, for the offer for power amplification output circuit in advance be servo-actuated bias voltage or
Bias current is servo-actuated in advance, and can guarantee that corresponding audio signal is operated in A class working conditions；
A class audio frequencies power amplification output circuit 111, the power for amplifying audio signal enables to promote loudspeaker
Send that volume is suitable, sound melodious music.
A kind of A genus audio power amplifiers, using biasing means servo-actuated in advance of the present invention, its operation principle
And process is as follows：
First, the audio input signal for needing to amplify is selected by audio signal input selection circuit 101, if selected
Simulated audio signal, then simulated audio signal enter analog to digital conversion circuit 102, it is converted after obtain corresponding IIS forms
Digital audio and video signals；If selected is digital audio and video signals, receives and be converted to by S/PDIF receiving circuits 110
The digital audio and video signals of IIS forms.
Then, the digital audio and video signals of above-mentioned two-way IIS forms, into IIS input selection circuits 103, the IIS for choosing
The digital audio and video signals of form are divided into two-way, all the way into digital audio and video signals delay circuit 108, carry out appropriate transmission delay
Obtain the digital audio and video signals of the IIS forms of time delay afterwards, the signal enters audio signal D/A converting circuit 106, it is converted after
The simulated audio signal amplified the need for obtaining time delay；Another road is directly entered bias control signal digital-to-analogue without transmission delay
Change-over circuit 104, it is converted after obtain advanced AC bias control signal, while in change-over circuit in transfer process
DAC chip coordinates listens to volume adjusting needs and suitably decays volume to obtain A class audio frequency work(according to the requirement of circuit design
The amplitude of bias voltage or bias current required for the power amplification output circuit of rate amplifier.
Then, the simulated audio signal for amplifying the need for time delay is processed in a conventional manner, respectively enters Audio Buffer/put
Big circuit 105, digital volume regulation circuit 107, audio voltage amplifying circuit 109, finally reach A class audio frequencies power amplification output
Circuit 111 carries out power amplification treatment.
Advanced AC bias control signal, into after full-wave rectifying circuit 115, obtains absolute value, the absolute value be with
Audio signal and change amplitude, then form advanced pulsation bias control signal.Advanced pulsation bias control signal enters
Enter amplitude holding circuit 114, amplitude holding circuit 114 has delayed the voltage of pulsation bias control signal to decline, if at this time
There is the lower pulsation bias control signal of amplitude, i.e. musical sound is smaller, due to the unilateral diode of full-wave rectifying circuit
Can only be to be unable to resorption electric current to amplitude holding circuit submitting electric current to next stage circuit, this lower pulsation biasing control letter
Number amplitude above high cannot be dragged down immediately, the big signal for guaranteeing above has reliably continued in the state of A classes
Success rate is amplified, and is only waited until that amplitude is slow and is even lower, the relative biasing for becoming amplitude of bias control signal of low amplitude value
Control signal, could enter amplitude holding circuit and form the amplitude of oneself；If at this time there is the biasing control of higher magnitude
Signal processed, i.e. musical sound are larger, it becomes possible to immediately enter amplitude holding circuit and draw high amplitude and form new amplitude, and
Holding is that hold-off voltage declines, and guaranteeing new big signal has advanced and enough big amount of bias to enter the state of A classes；It can be seen that
Amplitude holding circuit can allow amplitude higher to keep i.e. hold-off voltage decline all the time, that is never allow the biasing of big signal
Amplitude is not enough and offset time is not enough, and the amplitude of bias control signal obtains certain time delay, and adding bias control signal is
Advanced, offset time in advance will not be delayed, and suitably continue for some times.It is advanced after amplitude holding circuit
The slow drop bias control signal of pulsation, by change-over circuit 113, is carried out the slow drop bias control signal of advanced pulsation with mutually or anti-phase
Conversion, or appropriate amplification or attenuation processing is carried out, the control signal for being converted into voltage or current biasing circuit 112 is allowed to,
So biasing circuit 112 just can provide servo-actuated bias voltage in advance or in advance servo-actuated biased electrical for power amplification output circuit
Stream, allow each audio signal quiescent operation voltage or electric current as the amplitude size of audio signal is suitably biased in A classes
Working condition, amount of bias will not be excessive, and offset time also will not be delayed and extends too many, thoroughly overcomes common adjustable bias stagnant
The problem of dtmf distortion DTMF for bringing afterwards, while the operating efficiency of A genus audio power amplifiers is very high, it is achieved thereby that mesh of the invention
's.
Embodiment 2
Referring to Fig. 2, a kind of A genus audio power amplifiers, using biasing means servo-actuated in advance of the present invention, its bag
Include：Simulated audio signal input selection circuit 201, volume control circuit 202, branch circuit 204, analog signal delay circuit
205, Audio Buffer circuit 206, audio voltage amplifying circuit 203, full-wave rectifying circuit 207, amplitude holding circuit 208, conversion
Circuit 209, voltage or current biasing circuit 210, A class audio frequencies power amplification output circuit 211；A assonances unrelated to the invention
Other of frequency power amplifier are required to be constituted, for example：Power supply circuit, display circuit, control circuit, audio effect processing, guarantor
Protection circuit etc., does not just repeat herein.
The function of each several part circuit or effect are as follows respectively：
Audio signal input selection circuit 201, for selecting the audio signal to be listened to；
Volume control circuit 202, the size of volume and bias control signal is listened to for adjusting；
Branch circuit 204, for simulated audio signal to be divided into two-way, all the way into after analog signal delay circuit 205
Become the simulated audio signal of time delay, another road turns into advanced AC bias control signal without time delay；
Analog signal delay circuit 205, the transmission for postponing simulated audio signal, so as to bias voltage or bias current
Power amplification output circuit can be made just can in advance enter A class working conditions before the arrival of corresponding audio signal；
Audio Buffer circuit 206, for the impedance matching of audio signal；
Audio voltage amplifying circuit 203, for the voltage amplification of audio signal, is allowed to appropriate power amplification；
Full-wave rectifying circuit 207, for carrying out full-wave rectification to AC bias control signal, obtains bias control signal
Absolute value, forms advanced pulsation bias control signal；
Amplitude holding circuit 208, the amplitude for keeping pulsation bias control signal delays its voltage to decline, and can allow all the time
Amplitude holding higher be hold-off voltage decline, that is never allow big signal biasing amplitude not enough and offset time not
Foot, the amplitude of bias control signal obtains certain time delay, and it is advanced to add bias control signal, and offset time is in advance not
Can be delayed, and some times are suitably continue for, this allows for the amplitude size and time width of bias voltage or bias current
It is fully able to ensure that corresponding audio signal is steadily operated in its confidence band of A class working conditions.
Change-over circuit 209, for pulsation bias control signal to be carried out with phase or anti-phase conversion, or carries out appropriate amplification
Or decay, it is allowed to be converted into the control signal of biasing circuit；
Voltage or current biasing circuit 210, for the offer for power amplification output circuit in advance be servo-actuated bias voltage or
Bias current is servo-actuated in advance, and can guarantee that corresponding audio signal is operated in A class working conditions；
A class audio frequencies power amplification output circuit 211, the power for amplifying audio signal enables to promote loudspeaker
Send that volume is suitable, sound melodious music.
A kind of A genus audio power amplifiers, using biasing means servo-actuated in advance of the present invention, its operation principle
And process is as follows：
First, the analogue audio frequency input signal for needing to amplify is selected by audio signal input selection circuit 201, then mould
Intend audio signal and enter the regulation listening volume of volume control circuit 202, while being also the size for adjusting bias control signal；Then
Into branch circuit 204, simulated audio signal is divided into two-way, all the way into becoming time delay after analog signal delay circuit 205
The need for amplify simulated audio signal, another road turns into advanced AC bias control signal without time delay.
Then, the simulated audio signal for amplifying the need for time delay is processed in a conventional manner, respectively enters Audio Buffer electricity
Road 206, audio voltage amplifying circuit 203, finally reaching A class audio frequencies power amplification output circuit 211 carries out power amplification treatment.
Advanced AC bias control signal forms advanced pulsation biasing control letter after entering full-wave rectifying circuit 207
Number, advanced pulsation bias control signal enters amplitude holding circuit 208, then by change-over circuit 209, be converted into voltage or
The control signal of current biasing circuit 210, such biasing circuit 210 just can provide advanced servo-actuated for power amplification output circuit
Bias voltage is servo-actuated bias current in advance, it is achieved thereby that the purpose of the present invention.The operation principle of bias control signal treatment
It is same as Example 1, not repeated description herein.
Embodiment 3
Referring to Fig. 3 and Fig. 4, a kind of A genus audio power amplifiers are servo-actuated biasing means in advance using of the present invention,
A kind of advanced servo-actuated biasing A class earphone power for be a simplified function, being input into using two-channel IIS digital audio and video signals all the way is put
Big device, it includes：Digital audio and video signals delay circuit, bias control signal D/A converting circuit in Fig. 3, audio signal digital-to-analogue
In change-over circuit, and Fig. 4 digital volume regulation circuit, voltage amplifier circuit, full-wave rectifying circuit, amplitude holding circuit,
Change-over circuit, voltage-controlled current biasing circuit, power output circuit；A genus audio power amplifiers unrelated to the invention
Other it is required constitute, for example：Input selection circuit, S/PDIF receiving circuits, analog to digital conversion circuit, power supply circuit,
Display circuit, control circuit, audio effect processing, protection circuit etc., just do not repeat herein.
The function of each several part circuit or effect are as follows respectively：
Audio signal delay circuit, the transmission for postponing digital audio and video signals, so that bias current can put power
Big output circuit just can in advance enter A class working conditions before the arrival of corresponding audio signal；
Bias control signal D/A converting circuit, for no-delay digital audio and video signals to be converted into needed for biasing circuit
Analog signal, that is, be converted into advanced AC bias control signal；It is simultaneously synchronous to DAC chip U2 when volume is listened in regulation
Appropriate decay volume, the i.e. volume level of operation, makes bias control signal change with the size of audio signal amplitude, so that
Suitably it is servo-actuated bias current；
Audio signal D/A converting circuit, for the analog audio needed for being converted into listening to through the digital audio and video signals of time delay
Frequency signal, that is, be converted into the simulated audio signal of time delay；
Audio Buffer/amplifying circuit, for the impedance matching and voltage amplification of audio signal；
Digital volume adjusts circuit, and volume is listened to for adjusting, meanwhile, can be easily using digital volume regulative mode
The amplitude of linkage regulation bias control signal, enables bias control signal to be more accurately controlled biasing circuit；
Audio voltage amplifying circuit, for the voltage amplification of audio signal, is allowed to appropriate power amplification；
Full-wave rectifying circuit, for carrying out full-wave rectification to AC bias control signal, obtains the exhausted of bias control signal
To value, advanced pulsation bias control signal is formed；
Amplitude holding circuit, the amplitude for keeping pulsation bias control signal delays its voltage to decline, and can allow all the time more
Amplitude holding high be hold-off voltage decline, that is never allow big signal biasing amplitude not enough and offset time not
Foot, the amplitude of bias control signal obtains certain time delay, and it is advanced to add bias control signal, and offset time is in advance not
Can be delayed, and some times are suitably continue for, this amplitude size and time width for allowing for bias current are fully able to protect
Corresponding audio signal is demonstrate,proved reliably to be operated in the range of its A class working conditions；
Change-over circuit, for pulsation bias control signal to be carried out, with phase and anti-phase conversion, to be allowed to be converted into biased electrical
The voltage control signal on road；
Current biasing circuit, for the offer for power amplification output circuit in advance be servo-actuated bias current, and can guarantee that it is right
The audio signal amplified the need for answering is operated in A class working conditions；
A class audio frequency power amplification output circuits, the power for amplifying audio signal enables to promote loudspeaker to send
Volume is suitable, sound melodious music.
A kind of A genus audio power amplifiers, using biasing means servo-actuated in advance of the present invention, are a simplified work(
A kind of advanced servo-actuated biasing A class earphone power amplifiers that can, be input into using two-channel IIS digital audio and video signals all the way, its work
Make principle and process is as follows：
First, the digital audio and video signals of IIS forms are divided into two-way, all the way into the time delay of digital audio and video signals delay circuit
Chip U1, U1 can select the digital audio and video signals delay chip of the TPA5051 models of TI companies, and the setting of amount of delay is by monolithic
Machine is configured by IIC ports to delay chip, the DAB letter of the IIS forms by obtaining time delay after transmission delay
Number, the signal enters the DAC chip U3 of audio signal D/A converting circuit, converted followed by be carried out by operational amplifier U5
LPF（LPF）Obtain the simulated audio signal of time delay；Another road is directly entered bias control signal without transmission delay
The DAC chip U2 of D/A converting circuit, it is converted followed by have carried out LPF by operational amplifier U4（LPF）Surpassed
Preceding AC bias control signal, while U2 coordinates listening volume adjusting needs and wanting according to circuit design in transfer process
Appropriate decay volume is sought so as to the width of the bias current required for the power amplification output circuit for obtaining A genus audio power amplifiers
Value.
After the simulated audio signal amplified the need for time delay is through volume adjusting, into voltage amplifier circuit, by operation amplifier
Device U10 is amplified, and is allowed to appropriate power amplification；Finally, the simulated audio signal of time delay is exported into the power amplification of A class audio frequencies
Circuit, exports suitable power and promotes earphone.
The amplitude of advanced AC bias control signal can be adjusted and obtained by DAC chip U2, can be according to time delay
Simulated audio signal total volume and biasing circuit be actually needed between relation, DAC chip U2 is decayed to required number
Value.
Advanced AC bias control signal enters the signal full-wave rectifying circuit being made up of operational amplifier U6 and is surpassed
Preceding pulsation bias control signal, then advanced pulsation bias control signal is electric by the amplitude holding being made up of C24, R29 and U7A
Road, has delayed the voltage of pulsation bias control signal to decline so that the amplitude size and time of bias voltage or bias current are wide
Degree is fully able to ensure that corresponding audio signal is reliably operated in the range of its A class working conditions.Simultaneously by U7A to inclined
Put control signal to be amplified, be allowed to suitable control electric current biasing；And D5 is used to clamp down on minimum bias voltage, it is ensured that power amplification
Output circuit will not end in no signal and small-signal.
U8A, U9A, Q1, R32, R33 constitute signaling conversion circuit, the pulsation bias control signal transformation for changing with being based on
It is the voltage signal based on positive supply change, for producing positive voltage bias control signal；U8B, U9C, Q2, R34, R35 are constituted
Signaling conversion circuit, the pulsation bias control signal for changing with being based on is changed into the voltage signal based on negative supply change, uses
In generation negative voltage bias control signal.U9B, Q3, R36, R37 constitute voltage-controlled positive current biasing circuit, U9D, Q6,
R38, R39 constitute voltage-controlled negative current biasing circuit；U10 constitutes voltage amplifier circuit, and audio signal is amplified to properly
Voltage amplitude；Q4, Q5, R48, R37, R38 constitute pushing grade circuit, for final power amplification output circuit provides audio signal
Promote；Q7, Q8, R49, R50 constitute power output stage, so far complete Audio power amplifier.
So biasing circuit just can provide servo-actuated bias current in advance for power amplification output circuit, can allow each
The quiescent operation voltage or electric current of audio signal are suitably biased in A class working conditions with the amplitude size of audio signal, partially
The amount of putting will not be excessive, and offset time also will not be delayed and extends too many, thoroughly overcomes the mistake that common variable bias hysteresis band comes
True problem, while the operating efficiency of A genus audio power amplifiers is very high, it is achieved thereby that the purpose of the present invention.
A kind of advanced servo-actuated biasing A class earphone power amplifiers, have designed and have trial-produceed successfully model machine described in embodiment 3,
Its actual working condition is fully achieved design requirement.
Referring to Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, this is defeated with power amplification with the audio signal of simulation software test time delay
Go out quiescent current, the relation of output current of circuit, be input into the 1KHz's of 0.0V, 0.5V, 1.0V, 2.0V, 6.0V peak value respectively
Sine wave is tested, and obtains data below（In bracket is average value）：
| Input numerical value（V） | Quiescent current（mA）Just | Quiescent current（mA）It is negative | Output current（mA） |
| 0.000（0.000） | 2.650 | -2.682 | 0.000（0.000） |
| 0.500（0.354） | 11.635 | -11.698 | 8.418（5.953） |
| 1.000（0.707） | 25.473 | -25.607 | 15.970（11.294） |
| 2.000（1.414） | 57.628 | -57.929 | 32.070（22.680） |
| 6.000（4.243） | 192.460 | -193.268 | 96.146（67.996） |
It can be seen that, by the bias current that advanced servo-actuated bias control signal is controlled, accordingly change with audio signal completely,
Rather than as typical A power-like amplifiers, the static working current of efferent duct is chosen to be most in order to occur without amplitude limit
The 50% of big output current, so as to reach the effect of power saving.
Referring to Figure 10 and Figure 11, this is the oscillogram obtained with double track digital oscilloscopes, be embodiment 3 one kind it is advanced with
Advanced pulsation during dynamic biasing A class earphone power amplifier normal works is delayed drop bias control signal and is believed with the analogue audio frequency of time delay
Number oscillogram, from the figure, it can be seen that the slow drop bias control signal of advanced pulsation always correspond to the analogue audio frequency letter of time delay
Number advanced several milliseconds of times, servo-actuatedly for power amplification output circuit provides bias control signal, can ensure to be all of audio
Signal provides enough biasing, also can in time reduce biasing and reducing the quiescent current of power amplification output circuit reduces work(
Consumption.It can be seen that, the present invention has obtained the checking of side circuit.
The actual a kind of advanced servo-actuated biasing A class earphone power amplifiers for listening to embodiment 3, use thousand yuan of left sides of AKG brands
Right headphone listens to audio, and the fine dynamics of low frequency dive is powerful and resilient enough, intermediate frequency it is warm it is resistance to listen, high frequency is clear
Melodious be transferred to very big continuously listening sings vigorous dance with wild joy more than half an hour to overall sense of hearing very well, volume without at all crude, and ear is not yet
Can feel sick and be not suitable with.These senses of hearing comply fully with the performance of A genus audio power amplifiers.
We conducted power consumption test：
Supply voltage is ± 18V, and it is 6V to set not amplitude limit output voltage, connects the loudspeaker of 8 Ω, and peak power output is
4.5W, if the static working current of efferent duct is set as most in order to occur without amplitude limit according to existing A power-like amplifiers
The 50% of big output current,
The static working current of monophonic is：6V/8 Ω * 50%=0.375A,
It is to calculate simple consumption without the monaural power for amplifying music：（18+18）V*0.375A=13.5W
So continuously the electric quantity consumption of 5 hour two-channels of start is：13.5W*5H*2=135WH
In order to carry out analogy, it is 6V that the volume of the amplifier of embodiment 3 is set to output voltage, connects the loudspeaker of 8 Ω, even
Continued broadcasting is put the music on 5 hours, measures electric quantity consumption for 22WH, and the power consumption of advanced servo-actuated bias mode is about existing A classes biasing
The 16% of mode, power consumption is lower if volume is turned down, it is seen that power saving effect is extraordinary.
Related, example should be corresponded to by between the audio signal and the bias control signal without transmission delay of transmission delay
Such as, the regulation of volume must be related, and the treatment of audio must could only in this way be obtained before AC bias control signal is separated
To the servo-actuated bias voltage or servo-actuated bias current that more match, allow these bias voltages or bias current correspondence audio signal and
Speech size is suitable, allow each audio signal quiescent operation voltage or electric current as the amplitude size of audio signal is suitable
Be biased in A class working conditions, amount of bias will not be excessive, offset time also will not delayed and extension it is too many.
It is corresponding between the audio signal and the AC bias control signal without any transmission delay through time delay is ensured
On the premise of correlation, the burble point of AC bias control signal and the point of adjustment of listening volume can be according to design requirements neatly
Each node selection in audio signal link, without the burble point being confined to described in above-mentioned burble point and embodiment.
Through the above way, the invention provides a kind of A genus audio power amplifiers biasing means servo-actuated in advance and put
Big device, can give full play to the optimal advantage of A genus audio power amplifier distortions very little, linear fine, sense of hearing, while can be non-
Often significantly improve the operating efficiency of A genus audio power amplifiers.Above by reference to having illustrated various preferred realities of the invention
Example is applied, but without departing from the spirit and scope of the invention, those skilled in the art can carry out various forms to it
On modifications and changes, belong to protection scope of the present invention.
Claims (11)
1. a kind of the advanced of A genus audio power amplifiers is servo-actuated biasing means, it is characterised in that the audio for needing to amplify to selection
Signal enters line delay and using the simulated audio signal corresponding to the audio signal after time delay as input power amplification output circuit
The need for amplify audio signal, meanwhile, will select need amplify audio signal corresponding to simulated audio signal as with
In control voltage biasing circuit or the advanced AC bias control signal of current biasing circuit, and by processing of circuit produce with
The bias voltage or bias current of the amplitude change of the audio signal amplified the need for time delay, and described bias voltage or biasing
Electric current supplies power amplification output circuit and believes the audio that power amplification output circuit amplifies the need for being in corresponding time delay
A class working conditions needed for number.
2. the advanced of A genus audio power amplifiers according to claim 1 is servo-actuated biasing means, it is characterised in that selection
It is simulated audio signal to need the audio signal amplified, then enter line delay using the delay circuit of analog signal.
3. the advanced of A genus audio power amplifiers according to claim 1 is servo-actuated biasing means, it is characterised in that selection
It is simulated audio signal to need the audio signal amplified, then after analog-to-digital conversion is carried out to analog signal, then using DAB
Signal delay circuit time delay, puts the need for the time delay for most being converted into inputing to power amplification output circuit through D/A converting circuit afterwards
Big audio signal.
4. the advanced of A genus audio power amplifiers according to claim 1 is servo-actuated biasing means, it is characterised in that selection
It is digital audio and video signals to need the audio signal amplified, then delayed using digital audio and video signals delay circuit, reuses digital-to-analogue and turns
The audio signal amplified the need for digital audio and video signals to be converted into inputing to circuit the time delay of power amplification output circuit is changed, together
When, will select to need the digital audio and video signals without time delay for amplifying to be converted into simulated audio signal and for producing advanced being servo-actuated
Bias control signal；The amplitude of the audio signal that the advanced servo-actuated bias control signal amplifies the need for being used to produce with time delay
The bias voltage or bias current of change.
5. the advanced of the A genus audio power amplifiers according to claim 2,3 or 4 is servo-actuated biasing means, it is characterised in that
Before the audio signal input power amplification output circuit amplified the need for the time delay, sequentially through Audio Buffer amplifying circuit, number
Word volume control circuit and audio voltage amplifying circuit are processed, the Audio Buffer amplifying circuit, for the impedance of audio signal
Matching and voltage amplification；The digital volume adjusts circuit, and volume is listened to for adjusting, meanwhile, using digital volume regulation side
Formula can easily link and adjust the amplitude of bias control signal, bias control signal is more accurately controlled biased electrical
Road；The audio voltage amplifying circuit, for the voltage amplification of audio signal.
6. the advanced of A genus audio power amplifiers according to claim 1 is servo-actuated biasing means, it is characterised in that pass through
Processing of circuit produces the circuit of the bias voltage or bias current changed with the amplitude of the audio signal amplified the need for time delay
Processing method is as follows：The absolute value that full-wave rectification obtains bias control signal, shape are carried out to advanced AC bias control signal
Into advanced pulsation bias control signal, then formed for control voltage or electricity by after amplitude holding circuit and change-over circuit treatment
The bias control signal servo-actuated in advance of stream biasing circuit, voltage or current biasing circuit are produced according to advanced servo-actuated bias control signal
Bias voltage or bias current that life changes with the amplitude of the audio signal of time delay；Wherein, amplitude holding circuit is used to ensure
Power amplification output circuit can be operated reliably at A class working conditions, when the advanced pulsation biasing of input amplitude holding circuit
The amplitude of control signal is relative to become hour, and amplitude holding circuit delays the slow drop biasing control of the advanced pulsation that amplitude holding circuit is exported
The magnitude of voltage of signal processed declines, when being input into the relative change of the amplitude of advanced pulsation bias control signal of amplitude holding circuit and being big,
The magnitude of voltage moment that drop bias control signal is delayed in the advanced pulsation of amplitude holding circuit output rises；Change-over circuit is used for will be advanced
The slow drop bias control signal of pulsation is allowed to be converted into according to same phase or anti-phase conversion or adjustment amplitude is carried out the need for biasing circuit
It is adapted to the bias control signal servo-actuated in advance of voltage or current biasing circuit for amplitude.
7. a kind of amplifier, including voltage or current biasing circuit (112), full-wave rectifying circuit (115), amplitude holding circuit
(114), change-over circuit (113) and Audio power amplifier output circuit (111), the Audio power amplifier output circuit (111)
For receiving the simulated audio signal corresponding to the audio signal for needing to amplify, and corresponding to the audio signal for needing to amplify
Simulated audio signal be used to produce the advanced AC bias control signal of control voltage or current biasing circuit (112), institute
Voltage or current biasing circuit (112) are stated for Audio power amplifier output circuit (111) provides bias voltage or bias current, its
It is characterised by, the amplifier also includes delay circuit (108), and Audio power amplifier output circuit (111) receives needs
The audio signal of amplification enters Audio power amplifier output circuit (111) after the delay circuit (108) time delay；The needs
Simulated audio signal corresponding to the audio signal of amplification is by full-wave rectifying circuit (115), amplitude holding circuit (114) and turns
Change circuit (113) and produce servo-actuated bias control signal in advance afterwards, servo-actuated bias control signal is electric from voltage or current offset in advance
The control signal input input on road (112) and the bias voltage or bias current of control voltage or current biasing circuit (112)
Output；The full-wave rectifying circuit (115) is biased for carrying out full-wave rectification to advanced AC bias control signal
The absolute value of control signal, forms advanced pulsation bias control signal；Described amplitude holding circuit (114) is for producing guarantee
Power amplification circuit works in A class working conditions, when the advanced pulsation biasing control letter for being input into the amplitude holding circuit (114)
Number amplitude it is relative become hour, amplitude holding circuit (114) delays the advanced servo-actuated slow drop biasing control that amplitude holding circuit is exported
The magnitude of voltage of signal processed declines, and becomes when the amplitude of the advanced servo-actuated bias control signal of input amplitude holding circuit (114) is relative
When big, the magnitude of voltage moment of the advanced servo-actuated slow drop bias control signal of amplitude holding circuit output rises；Described biased electrical
Voltage conversion circuit is used to carry out pulsation bias control signal with phase and anti-phase conversion and adjust amplitude, is allowed to be converted into amplitude
It is adapted to the bias control signal servo-actuated in advance of voltage or current biasing circuit needs.
8. amplifier according to claim 7, it is characterised in that the amplitude holding circuit (114) is by electric capacity C24, electricity
Resistance R29 and operational amplifier U7A compositions, and its input is connected with full-wave rectifying circuit (115), output end and change-over circuit
(113) connect；Wherein electric capacity C24 is used to keep the voltage of input not decline, and resistance R29 is used to discharge electric energy.
9. amplifier according to claim 7, it is characterised in that the amplifier includes Audio Buffer amplifying circuit
(105), digital volume adjusts circuit (107) and audio voltage amplifying circuit (109), the Audio Buffer amplifying circuit (105)
For carrying out impedance matching and voltage amplification to the simulated audio signal after delay circuit (108) time delay, the digital volume is adjusted
Road (107) are economized on electricity for the simulated audio signal after Audio Buffer amplifying circuit (105) treatment listen to the regulation of volume,
The audio voltage amplifying circuit (109) is carried out for adjusting the simulated audio signal after circuit (107) treatment to digital volume
Voltage amplification, simulated audio signal after voltage amplification as Audio power amplifier output circuit (111) input signal.
10. amplifier according to claim 7, it is characterised in that it is analog signal, time delay to need the audio signal amplified
For digital audio and video signals delay circuit and in the amplifier, setting analog to digital conversion circuit (102) and digital-to-analogue turn circuit (108)
Circuit (104,106) is changed, the analog signal of audio signal input selection circuit (101) output is by analog to digital conversion circuit (102)
Digital audio and video signals are formed after conversion, the digital audio and video signals of analog-digital conversion circuit as described (102) output are by digital-to-analogue conversion electricity
Advanced AC bias control signal is formed after the treatment of road (104), meanwhile, the numeral of analog-digital conversion circuit as described (102) output
Audio signal forms simulated audio signal after being changed through the time delay of digital audio and video signals delay circuit and through D/A converting circuit (106)
And as the input signal of Audio power amplifier output circuit (111).
11. amplifiers according to claim 7, it is characterised in that it is data signal, time delay to need the audio signal amplified
Circuit (108) is digital audio and video signals delay circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610715463.5A CN106208973B (en) | 2016-08-24 | 2016-08-24 | Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers |
| PCT/CN2017/077232 WO2018036143A1 (en) | 2016-08-24 | 2017-03-20 | Advanced servo bias method of a-class audio power amplifier and amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610715463.5A CN106208973B (en) | 2016-08-24 | 2016-08-24 | Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106208973A CN106208973A (en) | 2016-12-07 |
| CN106208973B true CN106208973B (en) | 2017-06-30 |
Family
ID=57524978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610715463.5A Expired - Fee Related CN106208973B (en) | 2016-08-24 | 2016-08-24 | Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106208973B (en) |
| WO (1) | WO2018036143A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208973B (en) * | 2016-08-24 | 2017-06-30 | 叶鼎 | Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers |
| CN107994897B (en) * | 2017-11-27 | 2021-08-10 | 尚睿微电子（上海）有限公司 | Bias current control circuit and method and power amplification control circuit |
| CN112543000B (en) * | 2020-11-09 | 2022-02-15 | 武汉市聚芯微电子有限责任公司 | Power supply circuit, method, audio power amplifier and integrated circuit |
| CN116090570B (en) * | 2023-04-12 | 2024-02-23 | 本源量子计算科技（合肥）股份有限公司 | Quantum bit state regulation and control circuit, measurement and control circuit and quantum computer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2324703Y (en) * | 1998-05-05 | 1999-06-16 | 于建兵 | Lower-transient intermodulation distortion audio-frequency amplifier |
| CN101040434B (en) * | 2004-05-05 | 2010-05-26 | 奥德拉国际销售有限公司 | Audio amplifier |
| US7362168B2 (en) * | 2005-05-05 | 2008-04-22 | Audera International Sales Inc. | Audio amplifier |
| CN100566160C (en) * | 2006-12-21 | 2009-12-02 | 扬智科技股份有限公司 | Message amplifying unit and prevent the method for sonic boom |
| CN101771385B (en) * | 2008-12-30 | 2013-01-30 | 北京富纳特创新科技有限公司 | Power amplification circuit and thermally induced sound-producing device with power amplification circuit |
| CN106208973B (en) * | 2016-08-24 | 2017-06-30 | 叶鼎 | Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers |
-
2016
- 2016-08-24 CN CN201610715463.5A patent/CN106208973B/en not_active Expired - Fee Related
-
2017
- 2017-03-20 WO PCT/CN2017/077232 patent/WO2018036143A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018036143A1 (en) | 2018-03-01 |
| CN106208973A (en) | 2016-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106208973B (en) | Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers | |
| CN104503297B (en) | DSP audio digital signals processing system and method | |
| CN104093095B (en) | It is a kind of can automatic regulating volume singing device | |
| CN205793252U (en) | A kind of active noise reduction audio amplifier | |
| CN201025720Y (en) | TV set Kara OK accompanying system | |
| CN206237367U (en) | A kind of A genus audio power amplifiers based on advanced servo-actuated biasing | |
| CN201585114U (en) | Sound box | |
| CN105187990A (en) | Active de-noising circuit and method of active de-noising earphone | |
| CN203205048U (en) | Multifunctional portable electric guitar | |
| CN221615130U (en) | Liner machine loudspeaker control system | |
| CN201499287U (en) | Sound equipment volume controller with environment noise feedback | |
| CN201750521U (en) | Gaining and noise-removing sound source line | |
| CN208905194U (en) | Silent sound reverberation one power amplifier | |
| CN207854114U (en) | A kind of change of voice earphone | |
| CN207352955U (en) | A kind of portable mobile wireless sing accompanying system | |
| CN204993814U (en) | Initiative NOISE -CANCELLING HEADPHONES's active noise reduction circuit | |
| CN204993809U (en) | Dual track audio power amplifier circuit | |
| CN204231640U (en) | A kind of multistage amplitude limit control system exported for audio frequency | |
| CN220457541U (en) | Live broadcast system of analog and digital modes for mobile loudspeaker box | |
| CN221669852U (en) | Enhanced linear high-fidelity audio power amplifier without crossover distortion | |
| CN111556405B (en) | Power amplifier chip and electronic equipment | |
| CN214315522U (en) | Multifunctional electrified education active loudspeaker system | |
| CN218830588U (en) | Power amplifier voltage regulating circuit, power amplifier and electroacoustic equipment | |
| CN203233529U (en) | Multifunctional electric guitar sound box | |
| CN212628278U (en) | Net red live broadcast sound box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ye Ding Inventor after: Huang Yaohong Inventor after: Zhou Weiping Inventor before: Ye Ding Inventor before: Zhou Weiping |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170630 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |