CN107888150A - A kind of power amplification circuit of audio signal, method and terminal device - Google Patents
A kind of power amplification circuit of audio signal, method and terminal device Download PDFInfo
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- CN107888150A CN107888150A CN201711217730.7A CN201711217730A CN107888150A CN 107888150 A CN107888150 A CN 107888150A CN 201711217730 A CN201711217730 A CN 201711217730A CN 107888150 A CN107888150 A CN 107888150A
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- 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
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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Abstract
The embodiment of the present application discloses a kind of power amplification circuit of audio signal, method and terminal device, is related to field of terminal technology, the loss of power can be reduced simultaneously jamproof, so as to improve the amplification efficiency in audio signal amplification process.Concrete scheme is：Power module and power amplifier, power amplifier are AB power-like amplifiers or A power-like amplifiers；The input of power module is used to connect audio signal input device；The output end of power module and the power end of power amplifier connect, for to power amplifier input service voltage, and it is more than the absolute value of output voltage according to the absolute value of the output voltage control operating voltage of power amplifier, and the absolute value of operating voltage and the difference of output voltage is within a preset range；The input of power amplifier is used to connect audio signal input device, for carrying out power amplification to audio signal according to operating voltage.
Description
Technical field
The application is related to field of terminal technology, more particularly to a kind of power amplification circuit of audio signal, method and terminal
Equipment.
Background technology
Power amplification circuit is a kind of amplifying circuit for the purpose of exporting relatively high power, and it can be worked with driving load,
Such as loudspeaker.Wherein, power amplification circuit includes power module and power amplifier.Power module is used for whole power amplification electricity
Road powers；Power amplifier, general abbreviation " power amplifier ", it is a kind of under the conditions of given distortion rate, it is defeated peak power can be produced
Go out to drive the amplifier of a certain load.
At present, the power amplifier that power amplification circuit uses is generally D-type power amplifier and AB power-like amplifiers.
Wherein, D-type power amplifier is a kind of pulse controlled high-current switch amplifier, has high-frequency feature,
Its actual efficiency can about reach 90%；But D-type power amplifier is easily and in the equipment of power amplifier application
Other signals produce interference, and so as to produce noise, thus D-type power amplifier is typically only capable to be disposed adjacent to the position of loudspeaker
Put, so that power amplification circuit is laid out with larger limitation in a device.
AB power-like amplifiers are a kind of preferable amplifiers of antijamming capability.But its is less efficient, AB class work(is being used
During rate amplifier, power module is to AB power-like amplifier input service voltages, with several in energy caused by the operating voltage
The heating for the transistor that half energy is used in power module, remaining half energy are used for AB power-like amplifiers to audio
Signal is amplified, therefore actual efficiency of the AB power-like amplifiers when amplifying to audio signal only about 50%.
The content of the invention
The application provides a kind of power amplification circuit of audio signal, method and terminal device, can be jamproof same
When, the loss of power is reduced, so as to improve the amplification efficiency in audio signal amplification process.
In order to achieve the above object, the application adopts the following technical scheme that：
The first aspect of the application, there is provided a kind of power amplification circuit of audio signal, including：Power module and power are put
Big device.Wherein, power amplifier is AB power-like amplifiers or A power-like amplifiers.The input of power module is used to connect
Audio signal input device；The output end of power module and the power end of power amplifier connect, for defeated to power amplifier
Enter operating voltage, and the absolute of output voltage is more than according to the absolute value of the output voltage control operating voltage of power amplifier
Value, and the absolute value of operating voltage and the difference of output voltage is within a preset range.The input of power amplifier is used to connect sound
Frequency signal input apparatus, for carrying out power amplification to audio signal according to operating voltage.
In the application, because the power amplification circuit of audio signal is put using AB power-like amplifiers or A class power
Big device, therefore there is preferable antijamming capability；Also, it can be inputted due to power module by controlling to power amplifier
Operating voltage so that the absolute value of the difference of the output voltage of the operating voltage and power amplifier is within a preset range, now electric
Useless thermal power is very small caused by source module, therefore reduces the loss of power, amplified so as to improve audio signal
Amplification efficiency in journey.
The second aspect of the application, there is provided a kind of power-magnifying method of audio signal, can apply to include power supply mould
The power amplification circuit of the audio signal of block and power amplifier, input and the audio signal input device of power module connect
Connect, the output end of power module and the power end of power amplifier connect, and input and the audio signal of power amplifier input
Device connects.The power-magnifying method of audio signal in the application includes：Power module is electric to power amplifier input service
Pressure, power amplifier is AB power-like amplifiers or A power-like amplifiers；Power module is electric according to the output of power amplifier
Pressure, the absolute value of operating voltage is controlled to be more than the absolute value of output voltage, and the absolute value of operating voltage and the difference of output voltage
Within a preset range, with cause power amplifier according to operating voltage to audio signal carry out power amplification.
In the application, because the power amplification circuit of audio signal is put using AB power-like amplifiers or A class power
Big device, therefore there is preferable antijamming capability；Also, it can be inputted due to power module by controlling to power amplifier
Operating voltage so that the absolute value of the difference of the output voltage of the operating voltage and power amplifier is within a preset range, now electric
Useless thermal power is very small caused by source module, therefore reduces the loss of power, amplified so as to improve audio signal
Amplification efficiency in journey.
The third aspect of the application, there is provided a kind of terminal device, the terminal device include：At least one audio signal output
Device and the power amplification circuit such as the audio signal in the possible implementation of first aspect or first aspect.Wherein,
The power amplification circuit of audio signal is used to drive at least one audio signal output device, to cause at least one audio signal
Audio signal after output device output amplification.
In the application, terminal device not only simplify the layout of D-type power amplifier, and save cost；Also, reduce
The loss of power, so as to improving the amplification efficiency in audio signal amplification process.
The fourth aspect of the application, there is provided a kind of device of the power amplification of audio signal, the power of the audio signal are put
Big device includes：At least one audio signal output device and such as possible implementation of first aspect or first aspect
In audio signal power amplification circuit.
Brief description of the drawings
Fig. 1 is a kind of composition schematic diagram of the power amplification circuit for audio signal that the embodiment of the present application provides；
Fig. 2 is operating voltage of the prior art and the example schematic of output voltage；
Fig. 3 is a kind of operating voltage that the embodiment of the present application provides and the example schematic of output voltage；
Fig. 4 is the composition schematic diagram of the power amplification circuit for another audio signal that the embodiment of the present application provides；
Fig. 5 is a kind of composition schematic diagram for first power branch that the embodiment of the present application provides；
Fig. 6 is a kind of example schematic for primary sinusoid signal that the embodiment of the present application provides；
Fig. 7 is a kind of example schematic for first pwm signal that the embodiment of the present application provides；
Fig. 8 is a kind of composition schematic diagram for second source branch road that the embodiment of the present application provides；
Fig. 9 is the example schematic for the second sine wave signal that the embodiment of the present application provides；
Figure 10 is the example schematic for the second pwm signal that the embodiment of the present application provides；
Figure 11 is a kind of composition schematic diagram for power module that the embodiment of the present application provides；
Figure 12 is the composition schematic diagram of the power amplification circuit for another audio signal that the embodiment of the present application provides；
Figure 13 is a kind of structural representation for terminal device that the embodiment of the present application provides；
Figure 14 is the example schematic of terminal device of the prior art；
Figure 15 is a kind of example schematic for terminal device that the embodiment of the present application provides；
Figure 16 is a kind of flow chart of the power-magnifying method for audio signal that the embodiment of the present application provides；
Figure 17 is the flow chart of the power-magnifying method for another audio signal that the embodiment of the present application provides；
Figure 18 is the flow chart of the power-magnifying method for another audio signal that the embodiment of the present application provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation describes, it is clear that described embodiment is some embodiments of the present application, rather than whole embodiments.Based on this Shen
Please in embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belong to the scope of the application protection.
Term " first " and " second " in the specification and claims of the embodiment of the present application etc. are to be used to distinguish not
Same object, rather than the particular order for description object.For example, the first power branch and second source branch road etc. are to be used for
Different power branch is distinguished, rather than for describing the particular order of operational order.In the description of the embodiment of the present application, remove
Non- to be otherwise noted, the implication of " multiple " refers to two or more.
In the embodiment of the present application, " exemplary " or " such as " etc. word make example, illustration or explanation for expression.This
Application embodiment in be described as " exemplary " or " such as " any embodiment or design be not necessarily to be construed as comparing
Other embodiments or design more preferably or more advantage.Specifically, use " exemplary " or " such as " etc. word purport
Related notion is being presented in a concrete fashion.
The embodiment of the present application provides a kind of power amplification circuit of audio signal, method and terminal device, can be anti-dry
While disturbing, the loss of power is reduced, so as to improve the amplification efficiency in audio signal amplification process.
In the first embodiment of the application, Fig. 1 shows a kind of work(for audio signal that the embodiment of the present application provides
Rate amplifying circuit.As shown in figure 1, the power amplification circuit 1 of the audio signal can include：Power module 01 and power amplifier
02。
Wherein, the input of power module 01 is used to connect audio signal input device；The output end of power module 01 with
The power end connection of power amplifier 02, for the input service voltage of power amplifier 02, and according to power amplifier 02
The absolute value of output voltage control operating voltage is more than the absolute value of output voltage, and operating voltage and the difference of output voltage is exhausted
To being worth within a preset range.
Wherein, power amplifier 02 can be AB power-like amplifiers or A power-like amplifiers.Power amplifier 02 it is defeated
Enter end to be used to connect audio signal input device, and for carrying out power amplification to audio signal according to operating voltage.
Optionally, the power module 01 in the embodiment of the present application can be switching power circuit, Buck conversion circuit or
Boost chopper.
Optionally, the preset range in the embodiment of the present application can be 0.1V~0.2V.
Exemplary, so that power amplifier is AB power-like amplifiers as an example, by taking sine wave as an example.In the prior art, such as
Shown in Fig. 2, the operating voltage that the output end of power module inputs to AB power-like amplifiers is ± V1, and AB power-like amplifiers exist
The operating voltage (i.e. output voltage) used when amplifying to audio signal is ± V2, and the a1 parts in Fig. 2 are useless thermal power,
A2 parts are effective power, then the power amplification efficiency when amplifying to audio signal is
In the embodiment of the present application, as shown in figure 3, the work that the output end of power module 01 inputs to AB power-like amplifiers
Voltage is ± V3, and the output voltages of AB power-like amplifiers is ± V2, and V3 and V2 difference is 0.1V, the a3 parts (a3 in Fig. 3
<A1) it is useless thermal power, a2 parts are effective power, then the power amplification efficiency when amplifying to audio signal is
Due to a3<A1, it can be seen thatI.e. when amplifying to audio signal, the work(in the embodiment of the present application
Put efficiency and be more than power amplification efficiency of the prior art.
Exemplary, when the preset range in the embodiment of the present application is 0.1V, the power amplifier effect when amplifying to audio signal
Rate is maximum, and will not produce distortion phenomenon.
For example, the output voltage V2=4V of AB power-like amplifiers, the operating voltage of input is V3=4.1V, then power amplifier is imitated
Rate isPower module 01 is Switching Power Supply, and power-efficient is about 90%, then is put to audio signal
Gross efficiency when big is 97.6% × 90% ≈ 87.8%.As can be seen that audio signal is amplified using AB power-like amplifiers
When, the gross efficiency in the embodiment of the present application is more than gross efficiency of the prior art (being about 50%), and and uses D class power
Gross efficiency (being about 90%) during amplifier is almost identical.
The embodiment of the present application provides a kind of power amplification circuit of audio signal, due to the power amplification circuit of audio signal
Using AB power-like amplifiers or A power-like amplifiers, therefore there is preferable antijamming capability；Also, due to power supply
Module can be by controlling the operating voltage inputted to power amplifier so that the output electricity of the operating voltage and power amplifier
Within a preset range, now thermal power useless caused by power module is very small, therefore reduces work(for the absolute value of the difference of pressure
The loss of rate, so as to improve the amplification efficiency in audio signal amplification process.
Optionally, in a kind of implementation of the embodiment of the present application, with reference to Fig. 1, as shown in figure 4, showing the application
The power amplification circuit for another audio signal that embodiment provides.Specifically, the power module 01 in Fig. 4 can include first
Power branch 10 and second source branch road 20, power amplifier 02 are AB power-like amplifiers.
Wherein, the input of the first power branch 10 is used to connect audio signal input device, the first power branch 10
Output end is connected with the first power end of AB power-like amplifiers.The input of first power branch 10 is used to put to AB class power
Big device inputs the first operating voltage, and is more than the according to first the first operating voltage of output voltage control of AB power-like amplifiers
One output voltage, and the absolute value of the first operating voltage and the difference of the first output voltage is within a preset range.
Wherein, the input of second source branch road 20 is used to connect audio signal input device, second source branch road 20
Output end is connected with the second source end of AB power-like amplifiers.The input of second source branch road 20 is used to put to AB class power
Big device inputs the second operating voltage, and according to the absolute of second the second operating voltage of output voltage control of AB power-like amplifiers
Value is more than the absolute value of the second output voltage, and the absolute value of the second operating voltage and the difference of the second output voltage is in preset range
It is interior.
Wherein, the input of AB power-like amplifiers is used to connect audio signal input device.
Exemplary, the first power branch 10 in the embodiment of the present application can be positive supply module, AB class power amplifications
First power end of device can be positive power source terminal.First power branch 10 to AB power-like amplifiers input the first operating voltage+
V3 (i.e. V3, V3>0), and according to the first output voltage+V2 (i.e. V2, V2 >=0) of AB power-like amplifiers V3 is controlled to be more than V2,
And the absolute value of V3 and V2 difference is within a preset range.
For example, it is assumed that preset range is 0.1V.First output voltage of AB power-like amplifiers is 4V, the first power branch
10 the first operating voltages inputted to AB power-like amplifiers are 4.1V.
Exemplary, the second source branch road 20 in the embodiment of the present application can be negative supply module, AB class power amplifications
The second source end of device can be negative power end.Second source branch road 20 to AB power-like amplifiers input the second operating voltage-
V3, and (i.e. V3 is big according to absolute value of the second output voltage-V2 controls-V3 of the AB power-like amplifiers absolute value more than-V2
In V2), and the absolute value of-V3 and-V2 difference is within a preset range.
For example, it is assumed that preset range is 0.1V.Second output voltage of AB power-like amplifiers is -4V, the first power supply branch
The second operating voltage that road 10 then inputs to AB power-like amplifiers is -4.1V.
Further, the power module 01 in the embodiment of the present application can be switching power circuit.As shown in figure 5, show
The first power branch of one kind 10 that the embodiment of the present application provides.Wherein, the first power branch 10 include forward diode 100,
First comparator 101, the first transistor 102 and first go back primary circuit 103.
Wherein, the first end of forward diode 100 is used to connect audio signal input device, and the of forward diode 100
Two ends are connected with the first end of first comparator 101, and the second end of first comparator 101 connects with the grid of the first transistor 102
Connect, source electrode and the positive voltage (Volt Current Condenser, VCC) of the first transistor 102 connect, the first transistor
The first end that primary circuit 103 is gone back in 102 drain electrode with first is connected, and first goes back the second end of primary circuit 103 and AB class power amplifications
The first power end connection of device.
Wherein, forward diode 100, for carrying out separating treatment to audio signal, to obtain the first audio signal.
Exemplary, by taking sine wave signal as an example.As shown in fig. 6, forward diode 100 to shown in (1) in Fig. 6 just
String ripple signal carries out separating treatment, obtains the primary sinusoid signal shown in (2) in Fig. 6.
Wherein, first comparator 101, for being compared processing to the first audio signal, to obtain the first pulsewidth modulation
(Pulse Width Modulation, PWM) signal.
Exemplary, as shown in figure 5, the 3rd end of first comparator 101 is connected with the first saw-toothed wave generator, the first ratio
It is used to be compared processing to the first sawtooth signal caused by the first audio signal and the first saw-toothed wave generator compared with device 101.
It is exemplary, as shown in fig. 7, first comparator 101 is by the primary sinusoid signal shown in (2) in Fig. 6 and
One sawtooth signal is compared, and when primary sinusoid signal is higher than the first sawtooth signal, is designated as high level, when first just
When string ripple signal is less than the first sawtooth signal, low level is designated as, obtains the first pwm signal as shown in Figure 7.
Wherein, the first transistor 102, for being amplified processing to the first pwm signal, with the first PWM being amplified
Signal；The first transistor 102, the voltage for the first pwm signal for being additionally operable to be amplified according to the first output voltage control is the first work
Make voltage.
Exemplary, the first transistor 102 can be Metal-oxide-semicondutor (Metal-Oxide-
Semiconductor, MOS) pipe.The first transistor 102 controls the electricity of the first pwm signal of amplification according to the first output voltage V2
Press as the first operating voltage V3, V3 is more than V2, and the absolute value of V3 and V2 difference is within a preset range.
In the embodiment of the present application, it is the first work electricity that the first transistor 102, which controls the voltage of the first pwm signal of amplification,
Pressure, the first operating voltage is more than the first output voltage, and the absolute value of the first operating voltage and the difference of the first output voltage is pre-
If in scope, now the first transistor 102 is operated in saturation region (pressure drop between the source electrode of the first transistor 102 and drain electrode is big
About 0.1V), caused useless thermal power is very small.
Wherein, first primary circuit 103 is gone back, for carrying out reduction treatment to the first pwm signal of amplification, with what is be amplified
First audio signal；First goes back primary circuit 103, is additionally operable to input the of the amplification of the first operating voltage to AB power-like amplifiers
One audio signal.
Exemplary, first goes back primary circuit 103 reduction treatment such as can be filtered to the first pwm signal of amplification, obtain
To the first audio signal of amplification.First, which goes back primary circuit 103, can include the elements such as forward diode, inductance and electric capacity.
As shown in figure 8, show a kind of second source branch road 20 that the embodiment of the present application provides.Wherein, second source branch
Road 20 includes backward dioded 200, the second comparator 201, second transistor 202 and second and goes back primary circuit 203.
Wherein, the first end of backward dioded 200 is used to connect audio signal input device, and the of backward dioded 200
Two ends are connected with the first end of the second comparator 201, and the second end of the second comparator 201 connects with the grid of second transistor 202
Connect, the source electrode of second transistor 202 is connected with negative VCC, and the drain electrode of second transistor 202 goes back the first of primary circuit 203 with second
End connection, second goes back the second end of primary circuit 203 is connected with the second source end of AB power-like amplifiers.
Wherein, backward dioded 200, for carrying out separating treatment to audio signal, to obtain the second audio signal.
Exemplary, by taking sine wave signal as an example.As shown in figure 9, backward dioded 200 to shown in (1) in Fig. 6 just
String ripple signal carries out separating treatment, obtains the second sine wave signal as shown in Figure 9.
Wherein, the second comparator 201, for being compared processing to the second audio signal, to obtain the second pwm signal.
Exemplary, as shown in figure 8, the 3rd end of the second comparator 201 is connected with the second saw-toothed wave generator, the second ratio
It is used to be compared processing to the second sawtooth signal caused by the second audio signal and the second saw-toothed wave generator compared with device 201.
Exemplary, as shown in Figure 10, the second comparator 201 is by the second sine wave signal and the second sawtooth shown in Fig. 9
Ripple signal is compared, and when the second sine wave signal is higher than the second sawtooth signal, is designated as high level, when the second sine wave is believed
When number being less than the second sawtooth signal, low level is designated as, obtains the second pwm signal as shown in Figure 10.
Wherein, second transistor 202, for being amplified processing to the second pwm signal, with the 2nd PWM being amplified
Signal；Second transistor 202, the voltage for the second pwm signal for being additionally operable to be amplified according to the second output voltage control is the second work
Make voltage.
Exemplary, second transistor 202 can be metal-oxide-semiconductor.Second transistor 202 is controlled according to the second output voltage-V2
The voltage for making the second pwm signal of amplification is that the second operating voltage-V3 ,-V3 absolute value is more than-V2 absolute value, and-V3
And the absolute value of-V2 difference is within a preset range.
In the embodiment of the present application, it is the second work electricity that second transistor 202, which controls the voltage of the second pwm signal of amplification,
Pressure, the absolute value of the second operating voltage are more than the absolute value of the second output voltage, and the second operating voltage and the second output voltage
Difference absolute value within a preset range, now second transistor 202 be operated in saturation region (source electrode of second transistor 202 and
Pressure drop between drain electrode is about 0.1V), caused useless thermal power is very small.
Wherein, second primary circuit 203 is gone back, for carrying out reduction treatment to the second pwm signal of amplification, with what is be amplified
Second audio signal；Second goes back primary circuit 203, is additionally operable to input the of the amplification of the second operating voltage to AB power-like amplifiers
Two audio signals.
Exemplary, second goes back primary circuit 203 reduction treatment such as can be filtered to the second pwm signal of amplification, obtain
To the second audio signal of amplification.Second, which goes back primary circuit 203, can include the elements such as backward dioded, inductance and electric capacity.
In the embodiment of the present application, with reference to Fig. 5 and Fig. 8, as shown in figure 11, one kind electricity that the embodiment of the present application provides is shown
Source module 01.Wherein, power module 01 includes the first power branch 10 and second source branch road 20.First power branch 10 includes
Forward diode 100, first comparator 101, the first transistor 102 and first go back primary circuit 103.Second source branch road 20 includes
Backward dioded 200, the second comparator 201, second transistor 202 and second go back primary circuit 203.
Wherein, the first end of forward diode 100 is used to connect audio signal input device, and the of forward diode 100
Two ends are connected with the first end of first comparator 101, and the second end of first comparator 101 connects with the grid of the first transistor 102
Connect, the 3rd end of first comparator 101 is connected with the first saw-toothed wave generator, and the source electrode of the first transistor 102 connects with positive VCC
Connect, the first end that primary circuit 103 is gone back in the drain electrode of the first transistor 102 with first is connected, and the first the second end for going back primary circuit 103 is used
In the first power end of connection AB power-like amplifiers.
Wherein, the first end of backward dioded 200 is used to connect audio signal input device, and the of backward dioded 200
Two ends are connected with the first end of the second comparator 201, and the second end of the second comparator 201 connects with the grid of second transistor 202
Connect, the 3rd end of the second comparator 201 is connected with the second saw-toothed wave generator, and the source electrode of second transistor 202 connects with negative VCC
Connect, the first end that primary circuit 203 is gone back in the drain electrode of second transistor 202 with second is connected, and the second the second end for going back primary circuit 203 is used
In the second source end of connection AB power-like amplifiers.
In the embodiment of the present application, with reference to Fig. 4 and Figure 11, as shown in figure 12, show that the embodiment of the present application provides another
The power amplification circuit of kind audio signal.Wherein, the power amplification circuit 1 of audio signal includes power module 01 and AB power is put
Big device.Power module 01 includes the first power branch 10 and second source branch road 20.First power branch 10 includes positive two poles
Pipe 100, first comparator 101, the first transistor 102 and first go back primary circuit 103.Second source branch road 20 includes reverse two pole
Pipe 200, the second comparator 201, second transistor 202 and second go back primary circuit 203.
It should be noted that the power module in the embodiment of the present application can also be other switch power modules, this Shen
Please embodiment be not intended to be limited in any herein.
It should be noted that the symbol " ± " in the embodiment of the present application represents positive or negative, such as output voltage is ± V2 tables
Show that output voltage is+V2 (i.e. V2) or is-V2.
Optionally, in another implementation of the embodiment of the present application, power module 01 can only include the 3rd power supply
Branch road 30, power amplifier are A power-like amplifiers.
Wherein, the input of the 3rd power branch 30 is used to connect audio signal input device, the 3rd power branch 30
Output end is connected with the power end of A power-like amplifiers.The input of 3rd power branch 30 is used for defeated to A power-like amplifiers
Enter the 3rd operating voltage, and be more than according to the absolute value of the operating voltage of the 3rd output voltage control the 3rd of A power-like amplifiers
The absolute value of 3rd output voltage, and the absolute value of the 3rd operating voltage and the difference of the 3rd output voltage is within a preset range.A classes
The input of power amplifier is used to connect audio signal input device.
In second of embodiment of the application, Figure 13 shows a kind of terminal device that the embodiment of the present application provides.Such as
Shown in Figure 13, the terminal device 1300 can include：The power of at least one audio signal output device 1301 and audio signal
Amplifying circuit 1.
Wherein, the power amplification circuit 1 of audio signal is used to drive at least one audio signal output device 1301, so that
Obtain the audio signal after at least one output of audio signal output device 1301 amplification.
Exemplary, at least one audio signal output device 1301 can be at least one loudspeaker.
In the terminal device provided compared to prior art, the embodiment of the present application, the power amplification circuit 1 of audio signal
Layout comparison is flexible, is not necessarily limited near loudspeaker, especially includes multiple (being more than one) loudspeakers in terminal device
In the case of, better protrusion.Illustrate below in conjunction with the accompanying drawings.Figure 14 and Figure 15 respectively illustrates terminal in the prior art and set
For the terminal device 1300 in 1300 and the embodiment of the present application.
Exemplary, as shown in figure 14, terminal device 1300 of the prior art (is only showing two including multiple in Figure 14
Exemplified by individual) loudspeaker (i.e. loudspeaker 1 and loudspeaker 2) when, it is necessary to power amplification circuit (Figure 14 of the audio signal of respective numbers
In the power amplification circuit 2 of audio signal and the power amplification circuit 3 of audio signal).Wherein, the power amplification of audio signal
Circuit 2 includes D-type power amplifier 1, and the power amplification circuit 3 of audio signal includes D-type power amplifier 2, D class power amplifications
Device 1 is connected with loudspeaker 1, and D-type power amplifier 2 is connected with loudspeaker 2.
Exemplary, as shown in figure 15, the terminal device 1300 of the embodiment of the present application (only shows two multiple in Figure 15
Exemplified by) loudspeaker (i.e. loudspeaker 1 and loudspeaker 2) when, the power amplification circuit of audio signal can be used (in Figure 15
The power amplification circuit 1 of audio signal).Wherein, the power amplification circuit 1 of audio signal includes AB power-like amplifiers (or A classes
Power amplifier), AB power-like amplifiers are connected with loudspeaker 1 and loudspeaker 2 respectively.
Due in the prior art, when terminal device 1300 includes multiple (being more than one) loudspeakers, due to using D classes
Interference during power amplifier is larger, and D-type power amplifier is typically only capable to close to the position of loudspeaker, and needs multiple D classes work(
Rate amplifier drive the speaker, therefore the layout comparison of the D-type power amplifier in terminal device 1300 is complicated, and cost compared with
It is high.
And in the embodiment of the present application, when terminal device 1300 includes multiple loudspeakers, due to the power of audio signal
AB power-like amplifier antijamming capabilities in amplifying circuit 1 are stronger, AB power-like amplifiers can with position raising one's voice farther out
Device is connected to drive the loudspeaker, therefore an AB power-like amplifier can drive multiple loudspeakers, simplify power amplification
The layout of device, and save cost；Also, the power module 01 in the power amplification circuit 1 of audio signal is by controlling to AB
Power-like amplifier input operating voltage so that the difference of the output voltage of the operating voltage and AB power-like amplifiers it is absolute
Within a preset range, now thermal power useless caused by power module 01 is very small, therefore reduces the loss of power for value, from
And improve the amplification efficiency in audio signal amplification process.
In the third embodiment of the application, Figure 16 shows a kind of work(for audio signal that the embodiment of the present application provides
Rate amplification method, this method can apply to the power amplification circuit of the audio signal as described in any in Fig. 1, Fig. 4 and Figure 12.
As shown in figure 16, the power-magnifying method of the audio signal includes S1601 and S1602：
S1601, power module are to power amplifier input service voltage.
Wherein, power amplifier can be AB power-like amplifiers or A power-like amplifiers.
S1602, power module control the absolute value of operating voltage to be more than output electricity according to the output voltage of power amplifier
The absolute value of pressure, and the absolute value of operating voltage and the difference of output voltage is within a preset range.
Wherein, power amplifier can carry out power amplification according to operating voltage to audio signal.
The embodiment of the present application provides a kind of power-magnifying method of audio signal, due to the power amplification circuit of audio signal
Using AB power-like amplifiers or A power-like amplifiers, therefore there is preferable antijamming capability；Also, due to power supply
Module can be by controlling the operating voltage inputted to power amplifier so that the output electricity of the operating voltage and power amplifier
Within a preset range, now thermal power useless caused by power module is very small, therefore reduces work(for the absolute value of the difference of pressure
The loss of rate, so as to improve the amplification efficiency in audio signal amplification process.
Optionally, in the embodiment of the present application, with reference to Figure 16, as shown in figure 17, above-mentioned S1601 can specifically pass through S1601a
Realized with S1601b：
S1601a, power module input the first operating voltage by the first power branch to AB power-like amplifiers.
S1601b, power module input the second operating voltage by second source Zhi Luxiang AB power-like amplifiers.
Accordingly, in the embodiment of the present application, with reference to Figure 16, as shown in figure 17, above-mentioned S1602 can specifically pass through S1602a
Realized with S1602b：
S1602a, power module are by the first power branch, according to the first output voltage control of AB power-like amplifiers
First operating voltage is more than the first output voltage, and the absolute value of the first operating voltage and the difference of the first output voltage is in default model
In enclosing.
S1602b, power module are by second source branch road, according to the second output voltage control of AB power-like amplifiers
The absolute value of second operating voltage is more than the absolute value of the second output voltage, and the second operating voltage and the difference of the second output voltage
Absolute value within a preset range.
Optionally, in the embodiment of the present application, with reference to Figure 16, as shown in figure 18, above-mentioned S1601 can specifically pass through S1601c
Realize：
S1601c, power module input the 3rd operating voltage by the 3rd power branch to A power-like amplifiers.
Accordingly, in the embodiment of the present application, with reference to Figure 16, as shown in figure 18, above-mentioned S1602 can specifically pass through S1602c
Realize：
S1602c, power module are by the 3rd power branch, according to the 3rd output voltage control of A power-like amplifiers
The absolute value of three operating voltages is more than the absolute value of the 3rd output voltage, and the 3rd operating voltage and the difference of the 3rd output voltage
Absolute value is within a preset range.
It should be noted that the correlation technique step in the power-magnifying method for the audio signal that the embodiment of the present application provides
Specific descriptions, may be referred to the associated description of the power amplification circuit of audio signal in the embodiment of the present application, herein no longer
Repeat.
It should be noted that in the embodiment of the present application, term " comprising ", "comprising" or its any other variant are intended to
Cover including for nonexcludability, so that process, method, article or device including a series of elements not only include those
Key element, but also the other element including being not expressly set out, or it is this process, method, article or dress also to include
Put intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element in the process including the key element, method, article or device also be present.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on such understanding, the technical scheme of the application is substantially done to prior art in other words
Going out the part of contribution can be embodied in the form of software product, and the computer software product is stored in a storage medium
In (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal (can be mobile phone, computer, service
Device, air conditioner, or network equipment etc.) perform each embodiment of the application described in method.
Embodiments herein is described above in conjunction with accompanying drawing, but the application be not limited to it is above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the application, in the case of the application objective and scope of the claimed protection is not departed from, it can also make a lot
Form, belong within the protection of the application.
Claims (9)
- A kind of 1. power amplification circuit of audio signal, it is characterised in that including：Power module and power amplifier, the power amplifier are AB power-like amplifiers or A power-like amplifiers；The input of the power module is used to connect audio signal input device；The output end of the power module and the work( The power end connection of rate amplifier, for the power amplifier input service voltage, and according to the power amplifier The absolute value of operating voltage described in output voltage control be more than the output voltage absolute value, and the operating voltage with it is described The absolute value of the difference of output voltage is within a preset range；The input of the power amplifier is used to connect the audio signal input device, for according to the operating voltage pair Audio signal carries out power amplification.
- 2. the power amplification circuit of audio signal according to claim 1, it is characterised in that the power module includes the One power branch and second source branch road, the power amplifier are the AB power-like amplifiers；The input of first power branch is used to connect the audio signal input device, first power branch it is defeated Go out end to be connected with the first power end of the AB power-like amplifiers, for working to AB power-like amplifiers input first Voltage, and the first operating voltage according to the first output voltage control of the AB power-like amplifiers is defeated more than described first Go out voltage, and the absolute value of first operating voltage and the difference of first output voltage is within a preset range；The input of the second source branch road is used to connect the audio signal input device, the second source branch road it is defeated Go out end to be connected with the second source end of the AB power-like amplifiers, for working to AB power-like amplifiers input second Voltage, and the absolute value of the second operating voltage according to the second output voltage control of the AB power-like amplifiers is more than institute The absolute value of the second output voltage is stated, and the absolute value of second operating voltage and the difference of second output voltage is default In the range of；The input of the AB power-like amplifiers is used to connect the audio signal input device.
- 3. the power amplification circuit of audio signal according to claim 1, it is characterised in that the power module includes the Three power branch, the power amplifier are the A power-like amplifiers；The input of 3rd power branch is used to connect the audio signal input device, the 3rd power branch it is defeated Go out end to be connected with the power end of the A power-like amplifiers, for inputting the 3rd operating voltage to the A power-like amplifiers, And the absolute value of the 3rd operating voltage according to the 3rd output voltage control of the A power-like amplifiers is more than the described 3rd The absolute value of output voltage, and the absolute value of the 3rd operating voltage and the difference of the 3rd output voltage is in preset range It is interior；The input of the A power-like amplifiers is used to connect the audio signal input device.
- 4. the power amplification circuit of audio signal according to claim 2, it is characterised in that the first power branch bag Include forward diode, first comparator, the first transistor and first and go back primary circuit；The first end of the forward diode is used to connect the audio signal input device, the second end of the forward diode It is connected with the first end of the first comparator, the second end of the first comparator connects with the grid of the first transistor Connect, the source electrode of the first transistor is connected with positive voltage VCC, the drain electrode of the first transistor and the described first reduction The first end connection of circuit, described first goes back the second end of primary circuit connects with the first power end of the AB power-like amplifiers Connect；The forward diode, for carrying out separating treatment to the audio signal, to obtain the first audio signal；The first comparator, for being compared processing to first audio signal, to obtain the first pulse-width modulation PWM letter Number；The first transistor, for being amplified processing to first pwm signal, with the first pwm signal being amplified, And the voltage of the first pwm signal for amplifying according to first output voltage control is the first operating voltage；Described first goes back primary circuit, for carrying out reduction treatment to the first pwm signal of the amplification, be amplified first Audio signal, and the first audio of the amplification for inputting first operating voltage to the AB power-like amplifiers is believed Number.
- 5. the power amplification circuit of audio signal according to claim 2, it is characterised in that the second source branch road bag Include backward dioded, the second comparator, second transistor and second and go back primary circuit；The first end of the backward dioded is used to connect the audio signal input device, the second end of the backward dioded It is connected with the first end of second comparator, the second end of second comparator connects with the grid of the second transistor Connect, the source electrode of the second transistor is connected with negative VCC, and the drain electrode of the second transistor goes back the of primary circuit with described second One end is connected, and the described second the second end for going back primary circuit is connected with the second source end of the AB power-like amplifiers；The backward dioded, for carrying out separating treatment to the audio signal, to obtain the second audio signal；Second comparator, for being compared processing to second audio signal, to obtain the second pwm signal；The second transistor, for being amplified processing to second pwm signal, with the second pwm signal being amplified, And the voltage of the second pwm signal for amplifying according to second output voltage control is the second operating voltage；Described second goes back primary circuit, for carrying out reduction treatment to the second pwm signal of the amplification, be amplified second Audio signal, and the second audio of the amplification for inputting second operating voltage to the AB power-like amplifiers is believed Number.
- 6. a kind of power-magnifying method of audio signal, it is characterised in that applied to including power module and power amplifier The power amplification circuit of audio signal, the input of the power module are connected with audio signal input device, the power supply mould The output end of block and the power end of power amplifier connect, and the input of the power amplifier fills with audio signal input Connection is put, methods described includes：The power module to the power amplifier input service voltage, the power amplifier be AB power-like amplifiers or A power-like amplifiers；The power module controls the absolute value of the operating voltage more than described according to the output voltage of the power amplifier The absolute value of output voltage, and the absolute value of the operating voltage and the difference of the output voltage is within a preset range, to cause The power amplifier carries out power amplification according to the operating voltage to audio signal.
- 7. according to the method for claim 6, it is characterised in that the power module is to the power amplifier input service Voltage, including：The power module inputs the first operating voltage by the first power branch to the AB power-like amplifiers；The power module inputs the second operating voltage by AB power-like amplifiers described in second source Zhi Luxiang；Accordingly, the power module controls the absolute value of the operating voltage according to the output voltage of the power amplifier More than the absolute value of the output voltage, and the absolute value of the operating voltage and the difference of the output voltage is in preset range It is interior, including：The power module is by the first power branch, according to the first output voltage control of the AB power-like amplifiers First operating voltage is more than first output voltage, and first operating voltage and the difference of first output voltage is exhausted To being worth within a preset range；The power module is by second source branch road, according to the second output voltage control of the AB power-like amplifiers The absolute value of second operating voltage is more than the absolute value of second output voltage, and second operating voltage and described second The absolute value of the difference of output voltage is within a preset range.
- 8. according to the method for claim 6, it is characterised in that the power module is to the power amplifier input service Voltage, including：The power module inputs the 3rd operating voltage by the 3rd power branch to the A power-like amplifiers；Accordingly, the power module controls the absolute value of the operating voltage according to the output voltage of the power amplifier More than the absolute value of the output voltage, and the absolute value of the operating voltage and the difference of the output voltage is in preset range It is interior, including：The power module is by the 3rd power branch, according to the 3rd output voltage control of the A power-like amplifiers The absolute value of 3rd operating voltage is more than the absolute value of the 3rd output voltage, and the 3rd operating voltage and the described 3rd The absolute value of the difference of output voltage is within a preset range.
- 9. a kind of terminal device, it is characterised in that the terminal device includes：The power amplification of at least one audio signal output device and the audio signal as any one of claim 1-5 Circuit；The power amplification circuit of the audio signal is used to drive at least one audio signal output device, described to cause Audio signal after at least one audio signal output device output amplification.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711217730.7A CN107888150B (en) | 2017-11-28 | 2017-11-28 | Power amplification circuit and method for audio signal and terminal equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711217730.7A CN107888150B (en) | 2017-11-28 | 2017-11-28 | Power amplification circuit and method for audio signal and terminal equipment |
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| CN107888150A true CN107888150A (en) | 2018-04-06 |
| CN107888150B CN107888150B (en) | 2020-06-30 |
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| CN2796245Y (en) * | 2005-06-10 | 2006-07-12 | 李达标 | Power amplication circuit for power output wave form capable of automatic tracking input audio frequency signal wave form |
| CN203491978U (en) * | 2013-06-27 | 2014-03-19 | 快捷半导体(苏州)有限公司 | Output stage circuit, class AB amplifier and electronic device |
| US9220067B2 (en) * | 2011-05-02 | 2015-12-22 | Rf Micro Devices, Inc. | Front end radio architecture (FERA) with power management |
| CN106817094A (en) * | 2017-01-19 | 2017-06-09 | 中国科学院上海高等研究院 | A kind of radio frequency low-noise amplifier and its implementation |
| JP2018107974A (en) * | 2016-12-27 | 2018-07-05 | パナソニックＩｐマネジメント株式会社 | Switching power supply device and audio device |
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2017
- 2017-11-28 CN CN201711217730.7A patent/CN107888150B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2796245Y (en) * | 2005-06-10 | 2006-07-12 | 李达标 | Power amplication circuit for power output wave form capable of automatic tracking input audio frequency signal wave form |
| US9220067B2 (en) * | 2011-05-02 | 2015-12-22 | Rf Micro Devices, Inc. | Front end radio architecture (FERA) with power management |
| CN203491978U (en) * | 2013-06-27 | 2014-03-19 | 快捷半导体(苏州)有限公司 | Output stage circuit, class AB amplifier and electronic device |
| JP2018107974A (en) * | 2016-12-27 | 2018-07-05 | パナソニックＩｐマネジメント株式会社 | Switching power supply device and audio device |
| CN106817094A (en) * | 2017-01-19 | 2017-06-09 | 中国科学院上海高等研究院 | A kind of radio frequency low-noise amplifier and its implementation |
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| Publication number | Publication date |
|---|---|
| CN107888150B (en) | 2020-06-30 |
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