CN102739168B - High efficiency low-voltage power supply exports powerful audio driven framework - Google Patents
High efficiency low-voltage power supply exports powerful audio driven framework Download PDFInfo
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- CN102739168B CN102739168B CN201110087987.1A CN201110087987A CN102739168B CN 102739168 B CN102739168 B CN 102739168B CN 201110087987 A CN201110087987 A CN 201110087987A CN 102739168 B CN102739168 B CN 102739168B
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Abstract
The invention discloses a kind of high efficiency low-voltage power supply and export powerful audio driven framework, including: multi-coil loudspeaker；And single input N exports audio-frequency power amplifier, it is amplified the digital audio and video signals received and exports N path switching signal driving described multi-coil loudspeaker；Wherein N represents the port number of output, and N is the positive integer more than or equal to 2.The peak power output of the audio driven framework that the present invention is given is determined by the output channel sum of audio-frequency power amplifier completely, and its instantaneous power is determined by the coil number participating in work in loudspeaker.Use said method, the demand of high-power output in the case of low-voltage inputs can be met；This programme uses the mode of coil combination to improve output, coordinates unique dynamic distribution technique of power, it is achieved that the power equalizations organizing coil more, is greatly improved the delivery efficiency of audio driven.Program clear in structure, it is easy to accomplish.
Description
Technical field
The present invention relates to audio Systematic Design field, specifically, be that a kind of high efficiency low-voltage power supply output is powerful
Audio driven framework.
Background technology
General audio system is made up of source of sound, audio-frequency power amplifier and speaker, and the output of audio system determines
The size of the loudness of this system, i.e. sound.Source of sound therein is exactly the source of sound, can be divided into number according to storage mode difference
Word tone source and simulation source of sound.Source of sound is simulated exactly, such as with electric current and voltage shape for recording and process the source of sound of analogue signal
The audio signal that formula is propagated；Digital tone source record, process be all 0 and 1 permutation and combination formed abstract binary data stream, this
A little data are after digital-to-analogue conversion (DAC, Digital to Analog Converter), so that it may be reduced to analogue audio frequency letter
Number.Audio-frequency power amplifier is exactly weak audio signal to carry out power amplification to obtain the assembly of big signal.THD+N is
TotalHarmonic Distortion+Noise, it is simply that " total harmonic distortion plus noise ", it is the one of audio-frequency power amplifier
Individual main performance index, is also the condition determining audio-frequency power amplifier rated output power.Speaker is also loudspeaker, is
A kind of signal of telecommunication acoustical signal is changed into the energy transducer of acoustical signal, and the good and bad height on tonequality of the performance of speaker affects very
Greatly.
In audio system, under conditions of source of sound is certain, the output of audio system mainly defeated by power amplifier
Go out power and speaker determines.
In audio system, pass to specify the maximal audio power of resistive load to be exported by audio-frequency power amplifier
The maximum voltage amplitude of oscillation or the restriction of the maximum current amplitude of oscillation that can transmit of audio-frequency power amplifier.For most of audio powers
For amplifier, this voltage swing depends greatly on its supply voltage, therefore, for given load,
Maximum current and output will thus voltage swing determine.
Under normal circumstances, when designing audio frequency amplifier, specific design object and supply voltage need to be considered, but, as
Really audio Systematic Design personnel need bigger power, but are restricted by relatively low suppling voltage, then need to take unconventional
Method for designing.The most conventional method is: 1) reduce the internal resistance of speaker；2) running voltage of audio-frequency power amplifier is improved.
Although both approaches can solve the problem that the powerful problem of output but all exists the most not enough:
1), if reducing loudspeaker internal resistance, can increase at the electric current becoming to flow through loudspeaker, be limited by loudspeaker overcurrent capability,
And it is limited to increase powerful effect.The method inefficient, because electric current increases, the power also phase of loss on loudspeaker
Should increase.
2), if improving the running voltage of audio-frequency power amplifier, as when low voltage power supply, need to pass through power conversion
Realize.And the efficiency of Power convert is not the most 100%, with for the Boost structure that conversion efficiency is higher, its conversion efficiency is only
It is 80%～95%.
Moreover the running voltage of audio-frequency power amplifier is limited by production technology, it is impossible to infinitely rise, with mark at present
For the technique of accurate 0.35um, the maximum of the port that its technique ensures is pressure is only 5.5V.
The most existing two kinds of schemes improving audio system output are all that the mode using loss efficiency realizes,
And there is certain restriction.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high efficiency low-voltage power supply and exports powerful audio driven frame
Structure, to solve cannot realize under relatively low supply voltage situation the technical problem of efficient high power audio frequency output.
In order to achieve the above object, technical scheme is as follows:
A kind of high efficiency low-voltage power supply exports powerful audio driven framework, including: multi-coil loudspeaker；And single input
N exports audio-frequency power amplifier, is amplified the digital audio and video signals received and exports N path switching signal driving described many
Coil loudspeaker；Wherein N represents the port number of output, and N is the positive integer more than or equal to 2.
The peak power output of the audio driven framework that the present invention is given is completely by the output channel of audio-frequency power amplifier
Sum determines, its instantaneous power is determined by the coil number participating in work in loudspeaker.Use said method, low-voltage input can be met
In the case of the demand of high-power output；This programme uses the mode of coil combination to improve output, coordinates unique power
Dynamically distribution technique, it is achieved that the power equalizations organizing coil, is greatly improved the delivery efficiency of audio driven more.Program structure
Clearly, it is easy to accomplish.
Accompanying drawing explanation
Fig. 1 is the audio Systematic Design structure chart of the present invention；
Fig. 2 is the single input and multi-output audio system structure chart of the present invention；
Fig. 3 is many bit Delta-Sigma modulating unit schematic diagram of the present invention；
Fig. 4 is the intelligent electric power management cell schematics of the present invention；
Fig. 5 is the multi-coil horn structure schematic diagram of the present invention.
Detailed description of the invention
Below according to Fig. 1 to Fig. 5, provide one preferable embodiment of the present invention, and be described in detail, enable the most geographical
Solve the function of the present invention, feature.
The present invention gives a kind of high efficiency low-voltage power supply and export powerful audio driven framework, its system structure is such as
Shown in Fig. 1, this system is exported (wherein N represents the port number of output, and N is the positive integer more than or equal to 2) sound by a kind of single input N
Frequently power amplifier 10 and multi-coil loudspeaker 20 form.
Single input N exports audio frequency amplifier 10, it is achieved the amplification of audio signal also exports N path switching signal and drives multi-coil
Loudspeaker.Its core is made up of over-sampling modulating unit 101, output dynamic allocating unit 102 and driver element 103,
Its system structure is as shown in Figure 2.Driver element 103 comprises N group D-type audio power amplifier, can be used for driving N group coil, often
The unlatching control signal of group switching tube is connected with the output signal of output allocation unit；Output dynamic allocating unit
102 use dynamic power detection and the mode distribution power of dynamic equalization in N number of output channel mapped that intersects, and are used for improving
The work efficiency of driver element；Over-sampling modulating unit 101 is by the over-sampling wave filter of K times and the increment of bit more than
Summation (Delta Sigma) modulating unit forms, and the modulates audio signals of input becomes the control signal of a N bit, is used for
Control N map, this control signal can be pwm signal can also be PDM signal.
Fig. 3 provides the Delta-Sigma modulating unit system construction drawing of many bit, and the Delta-Sigma modulation of many bit is single
Unit includes a 16 bit comparator H and sampling circuit Q, and two inputs of 16 bit comparator H receive one respectively
16 bit signals and an output signal from sampling circuit Q, 16 bit comparator H output signal after comparing connects takes out
The input of sample circuit Q.
Fig. 4 provides intelligent power balanced unit system construction drawing.Intelligent power balanced unit is by a sample circuit S and
Individual coding circuit I forms.The signal of prime modulation output is re-encoded by this unit, is assigned to often by power averaging dynamically
In the driving stage of road, it is ensured that the mean power output of each driving stage is consistent.
Multi-coil loudspeaker 20 are a kind of loudspeaker being internally integrated the many groups of coils coaxially arranged, and often group coil is the most permissible
Independent driving sound horn.Fig. 5 gives the system construction drawing of multi-coil loudspeaker.When the coil being in magnetic field has electric current to pass through
Time, just producing the magnetic field with curent change, the magnetic field of this magnetic field and permanent magnet interacts, and makes voice coil loudspeaker voice coil axially
Vibration occurs.
The peak power output of the audio system that the present invention is given is completely by the output channel sum of audio-frequency power amplifier
Determining, its instantaneous power is determined by the coil number participating in work in loudspeaker.Such as, system uses the audio frequency merit of single input N output
Rate amplifier and the loudspeaker comprising N group coil form, and in loudspeaker, the peak power output of single group coil is W watt, then this system
Peak power output is N × W watt.
Use said method, by the number of reasonable disposition loudspeaker coil, can under low voltage situations any power, and
The program have employed dynamic power control technology, it is ensured that each coil in loudspeaker is operated in optimum state to improve effect
Rate.The program is simple, it is simple to promote.
Use after the present invention, compensate for the deficiencies in the prior art:
1, power supply is not carried out boost operations, it is to avoid the power attenuation brought due to boosting, at equal output
In the case of, improve efficiency more than at least 5%.
2, during whole system is operated in the environment of low pressure, traditional die processing technique just can meet system sound intermediate frequency power
The requirement of driver, greatly reduces the cost of system.
3, experimental verification shows, the need of output high-power audio signal when the present invention can well meet operating on low voltage
Ask.To drive 3 coil loudspeaker, each coil 8 ohm, system as a example by, 5V input, under THD+N ＜ 1% working condition, its
The output of output can reach 4.03 watts.
Above-described, only presently preferred embodiments of the present invention, it is not limited to the scope of the present invention.The most every foundation
Change simple, equivalent that claims of the present patent application and description are made and modification, fall within patent of the present invention
Claims.
Claims (6)
1. a high efficiency low-voltage power supply exports powerful audio driven framework, it is characterised in that including:
Multi-coil loudspeaker；And
Single input N exports audio-frequency power amplifier, is amplified the digital audio and video signals received and exports N path switching signal
Drive described multi-coil loudspeaker；Wherein N represents the port number of output, and N is the positive integer more than or equal to 2；
Wherein, described single input N output audio-frequency power amplifier includes:
Over-sampling modulating unit, is made up of the increment summation modulating unit of over-sampling wave filter and M-bit, by the digital sound of input
Frequently signal is modulated into the control signal of a N-bit, is used for controlling N map；Wherein M is more than or equal to 1 and less than or equal to 216
Positive integer；
Receive the output dynamic allocating unit of the output signal of described over-sampling modulating unit, use dynamic power detection and
The mode mapped of intersecting distributes power in the passage of N number of output dynamic equalization；And
Receive the driver element of the output signal of described output dynamic allocating unit, comprise N group D class audio frequency power amplification
Device.
2. high efficiency low-voltage power supply as claimed in claim 1 exports powerful audio driven framework, it is characterised in that described
The driving signal of audio-frequency power amplifier is fed back to an intelligent power balance module, and this intelligent power balance module is according to current
Driving stage duty, real-time carries out power distribution.
3. high efficiency low-voltage power supply as claimed in claim 2 exports powerful audio driven framework, it is characterised in that described
The increment summation modulating unit of M-bit includes 16 bit comparators and a sampling circuit, two of 16 bit comparators
Input receives 16 bit signals and an output signal from sampling circuit respectively, 16 bit comparators through comparing
After output signal connect sampling circuit input.
4. the high efficiency low-voltage power supply as described in claim 1 or 2 or 3 exports powerful audio driven framework, and its feature exists
In, the control signal of described N-bit is pwm signal or PDM signal.
5. the high efficiency low-voltage power supply as described in claim 1 or 2 or 3 exports powerful audio driven framework, and its feature exists
In, described multi-coil loudspeaker be a kind of be internally integrated the many groups of coils coaxially arranged and often group coil the most independently drive loudspeaker to send out
The loudspeaker of sound.
6. the high efficiency low-voltage power supply as described in claim 1 or 2 or 3 exports powerful audio driven framework, and its feature exists
In, described high efficiency low-voltage power supply exports powerful audio driven framework and also includes AD conversion unit, the mould that will receive
Intend being transported to after audio signal is converted to digital audio and video signals in described single input N output audio-frequency power amplifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110087987.1A CN102739168B (en) | 2011-04-08 | High efficiency low-voltage power supply exports powerful audio driven framework | |
| US13/368,073 US9571926B2 (en) | 2011-04-08 | 2012-02-07 | High-efficiency low-voltage-power-supply high-power-output audio driver architecture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110087987.1A CN102739168B (en) | 2011-04-08 | High efficiency low-voltage power supply exports powerful audio driven framework |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102739168A CN102739168A (en) | 2012-10-17 |
| CN102739168B true CN102739168B (en) | 2016-12-14 |
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Granted publication date: 20161214 |