CN106953608B - Power amplifier device - Google Patents
Power amplifier device Download PDFInfo
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- CN106953608B CN106953608B CN201610007894.6A CN201610007894A CN106953608B CN 106953608 B CN106953608 B CN 106953608B CN 201610007894 A CN201610007894 A CN 201610007894A CN 106953608 B CN106953608 B CN 106953608B
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- power
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- control circuit
- amplifier
- preamplifier
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of power amplifier devices, and it includes a preamplifier state, the bass being connect in a manner of feedback with the preamplifier in the preamplifier state equipped with a preamplifier and one tightens control circuit；One power-amplifier stage, an audio power output stage and dynamic source voltage switching switch are equipped in the power-amplifier stage, the audio power output stage and preamplifier state are electrically connected, and one of input terminal of dynamic source voltage switching switch connects a lesser fixed power source voltage；One power supply circuit, another input terminal of connection dynamic source voltage switching switch, to provide a dynamic source voltage for being greater than the fixed power source voltage to the power-amplifier stage when preamplifier state enhances bass audio signal；Whereby, the present invention can be realized supper bass strengthening effect and reduce circuit size, while keep the surplus and dynamic range of output, and then reach the effect of greatly improving product practicability and reliability.
Description
Technical field
The present invention relates to a kind of power amplifiers, espespecially a kind of that there is bass boost and dynamic power supplies to control (boomer
And dynamic power range control) function audio-frequency power amplifier.
Background technique
In audio-frequency power amplifier (Audio Power Amplifier) technical field, a variety of circuits have been developed so far
Topological structure (topology), comprising: A class, B class, AB class, D class, G class etc., by taking D audio frequency amplifier as an example, as shown in Figure 1,
It has a comparison circuit 11, and two input terminals of the comparison circuit 11 receive the audio signal 111 and one of a simulation respectively
Triangular signal 112, so as to obtain a pulse-width modulation signal in the output end of comparison circuit 11, pulse-width modulation signal transmission
To a driving and output stage 12, to drive and control the power crystal in the driving and output stage 12, after obtaining an amplification
Pulse-width modulation signal, finally, the amplified pulse-width modulation signal filters out high frequency carrier using a low-pass filter 13, i.e.,
It can restore and obtain the amplified audio signal and be exported by a loudspeaker 2.
Existing audio-frequency power amplifier though the function of amplification audio signal can be realized, but still faces following technical problem:
Firstly, for miniaturization acoustic product rather popular at present, such as Portable Bluetooth loudspeaker, since its horn single body is in volume
On limitation, user often can only make choice between the convenience of carrying and the shock effect of the sense of hearing, therefore, it is necessary to
Develop it is a kind of miniaturization and the audio-frequency amplifier that supper bass is strengthened function can be provided simultaneously with；Secondly, along with aforementioned bass strengthening
Audio-frequency amplifier and the problem come are as follows: when the level of audio bass is dynamically increased, so that beyond power output stage
When supply voltage, it will lead to amplified audio output signal by wave chopping (clipping), form saturation distortion phenomenon, cause loudspeaker
There is distorsion or sonic boom, seriously affect listening experience.So how to make audio-frequency power amplifier when reinforcing bass level,
Supply voltage can be dynamically adjusted simultaneously enables it keep enough surpluses (headroom), to maintain enough out-put dynamic ranges
(dynamic range) becomes the technical task of a great urgency and practicability.
Summary of the invention
It is difficult to combine miniaturization in view of existing audio-frequency power amplifier and reinforces the design mesh of supper bass effect
Mark, therefore integrated circuit can be allowed to keep integrated and bass boost effect can be achieved at the same time it is an object of the invention to develop one kind
Power amplifier device.
Dynamic power supplies control (dynamic can be achieved at the same time when another object of the present invention is to develop a kind of reinforcing bass
Power range control) function power amplifier device.
In order to reach the goals above, the present invention provides a kind of power amplifier device, it includes: a preamplifier state, it should
The bass being connect in a manner of feedback with the preamplifier in preamplifier state equipped with a preamplifier and one tightens control
Circuit, the bass tighten control circuit equipped with one first feedback resistance and an active electric in parallel with first feedback resistance
Hold multiple circuit；One power-amplifier stage, the power-amplifier stage is interior to be equipped with an audio power output stage and a dynamic source voltage
Switching switch, the audio power output stage and preamplifier state are electrically connected, and dynamic source voltage switching switch has one the
One power voltage input terminal, a second source voltage input end and a supply voltage output end, first supply voltage input
One lesser fixed power source voltage of end connection, the supply voltage output end are connected with the audio power output stage；One power supply supplies
Circuit is answered, amplitude and detecting phase circuit, driving circuit and power output stage, the drive are equipped in the power supply circuit
Dynamic circuit includes reference voltage control circuit, error amplifier bandwidth control circuit and bleeder circuit, the error amplifier
Bandwidth control circuit has first input end, the second input terminal and an output end, the amplitude and detecting phase circuit respectively with it is preceding
The second input terminal for setting amplifying stage, reference voltage control circuit and error amplifier bandwidth control circuit is electrically connected, the reference
Voltage control circuit is also electrically connected with the first input end of error amplifier bandwidth control circuit, and the error amplifier bandwidth
The output end of control circuit and the input terminal of power output stage are electrically connected, which is separately connected in a manner of feedback
The output end of the power output stage and the second input terminal of error amplifier bandwidth control circuit, but the power exports
Second source voltage input end of the output end of grade also with dynamic source voltage switching switch is electrically connected, to generate one than solid
Determine the big dynamic source voltage of supply voltage.
In one embodiment of this invention, which is full differential amplifier.
In one embodiment of this invention, which tightens control circuit equipped with one and the active capacitance multiplier circuit phase
Concatenated second feedback resistance, and the resistance value of second feedback resistance is less than the resistance value of the first feedback resistance.
In one embodiment of this invention, power amplifier device further includes a driving output stage, driving output
Grade be set between preamplifier state and power-amplifier stage, and the driving output stage respectively with preamplifier state and power-amplifier stage
It is connected.
In one embodiment of this invention, stop equipped with a dead time control circuit and one with this in the driving output stage
The voltage position quasi displacement circuit that stagnant time control circuit is electrically connected, the dead time control circuit and voltage position quasi displacement circuit
It is electrically connected respectively with the message power output stage in the preamplifier and power-amplifier stage in preamplifier state.
By above structure, the present invention can be realized supper bass strengthening effect and reduce circuit size, while keep exporting
Surplus and dynamic range, and then reach and greatly improve product practicability and reliability.
Detailed description of the invention
Fig. 1 is the framework block schematic diagram of existing class-D amplifier；
Fig. 2 is framework block schematic diagram of the invention；
Fig. 3 is a kind of schematic diagram of more specific embodiment of the preamplifier state in the present invention；
Fig. 4 is action schematic diagram of the invention.
Description of symbols: 11- comparison circuit；111- audio signal；112- triangular signal；12- driving and output stage；
13- low-pass filter；2- loudspeaker；3- preamplifier state；31- preamplifier；32- bass tightens control circuit；321- master
Dynamic formula capacitance multiplier circuit；4- power-amplifier stage；41- audio power output stage；42- dynamic source voltage switching switch；421-
First supply voltage output end；422- second source voltage input end；423- supply voltage output end；5- drives output stage；51-
Dead time control circuit；52- voltage position quasi displacement circuit；6- power supply circuit；61- amplitude and detecting phase circuit；62-
Driving circuit；63- power output stage；631- input terminal；632- output end；64- reference voltage control circuit；65- error
Amplifier bandwidth control circuit；651- first input end；The second input terminal of 652-；653- output end；66- bleeder circuit；7- is raised
Sound device；Rf1- the first feedback resistance；Rf2- the second feedback resistance；RINInput resistance.
Specific embodiment
Following embodiment is particularly applicable to the various existing power amplifiers such as A class, B class, AB class, D class, the present invention couple
This is simultaneously not limited.
As shown in Fig. 2, the present invention provides a kind of power amplifier device, it includes:
One preamplifier state 3 is equipped with a preamplifier 31 and one in the preamplifier state 3 in a manner of feedback and before this
The bass for setting the connection of amplifier 31 tightens control circuit 32, as shown in figure 3, it discloses the preamplifier states 3, especially wherein
Bass tighten control a kind of more specific embodiment of circuit 32, in this embodiment, which preferably adopts
With the full differential amplifier (fully differential amplifier) with double output ends, such amplifier has preferable
Anti-noise jamming efficiency, suitable for the application having higher requirements to sound quality, also because using complete differential amplification herein
Device, so the bass tightens control, the quantity of circuit 32 is 2, more specifically, the bass tightens control, circuit 32 is equipped with one the
One feedback resistance Rf1And one and first feedback resistance Rf1Active capacitance multiplier circuit 321 in parallel, such configuration can produce
The effect of raw similar low-pass filter, as long as in this way, being suitably set the first feedback resistance Rf1With the input of preamplifier 31
Resistance RINBetween ratio, can make the preamplifier 31 that there is biggish gain for the audio signal of low frequency, thus real
The purpose of existing bass strengthening (bass boost), in addition, the bass tightens control, circuit 32 can also be further provided with one and the master
The second feedback resistance R that dynamic formula capacitance multiplier circuit 321 is connected in seriesf2, and second feedback resistance Rf2Resistance value less than first
Feedback resistance Rf1, it so also can reach identical bass strengthening effect, in addition, in other feasible embodiments, the preceding storing
Other kinds of amplifier, such as the differential amplifier of Single-end output (single ended output) can also be used in big device 31,
It only needs to use a bass at this time to tighten control circuit 32；
It is worth noting that, when selecting feedback capacitor for the preamplifier 31, in order to have preamplifier 31
Preferable low frequency response characteristic, to realize real supper bass strengthening effect (with the frequency for the audio signal that human ear can receive
For range about 20~20kHz, supper bass can be just generally considered to be in the audio signal of 50~250Hz range or so), usually
Sufficiently large capacitor, such as the capacitor of nF grade must be used, but so big capacitor is difficult to be integrated in preamplifier 31
In single a IC chip, it can only be unable to satisfy in the form of discrete elements come the size for being arranged, thus circuit board being significantly increased
The miniature requirement of portable acoustic product, in this regard, the present invention is used as the preposition amplification using active capacitance multiplier circuit 321
The feedback capacitor of device 31, the active capacitance multiplier circuit 321 are actually that one kind contains active member (such as amplifier or crystalline substance
Body pipe) active capacity multiplier (active capacitance multiplier), configure in circuit one lesser
Capacitor, at the same adjust, in control circuit different resistance ratio, so as to by entire circuit equivalent at a biggish capacitor, should
The particular circuit configurations of active capacitance multiplier circuit 321 are the prior art, and therefore it will not be described in detail herein, and whereby, the present invention is at this
The capacitor of actual value only up to pF grade need to be only used in active capacitance multiplier circuit 321, can it is equivalent go out nF grade capacitor
Effect, to make the present invention that can integrate active capacitance multiplier circuit 321 with preamplifier 31, be integrated in the same IC core
In piece, substantially to reduce the volume of circuit, and then make the present invention can reach simultaneously bass strengthening and reduce circuit size the effect of；
One power-amplifier stage 4, the power-amplifier stage 4 is interior to be equipped with an audio power output stage 41, the audio power output stage
41 are electrically connected with preamplifier state 3, to carry out power amplification to the audio signal via the amplification output of preamplifier state 3,
Audio output is carried out to make the power-amplifier stage 4 that the audio signal after power amplification can be sent to a loudspeaker 7, it is such as same
As power output stage, power crystal is typically provided in the audio power output stage 41, using the transmitting element (pass as energy
Element), and remaining specific structure in the audio power output stage 41 is well known to the skilled person, not in this
It repeats again, in addition, can also be equipped with a dynamic source voltage in the power-amplifier stage 4 switches switch 42, which is cut
Switch 42 is changed with one first power voltage input terminal 421, a second source voltage input end 422 and supply voltage output
End 423, wherein first power voltage input terminal 421 connects a lesser fixed power source voltage, such as Vdd, the supply voltage
Output end 423 is connected with the audio power output stage 41, to supply voltage needed for transmitting the audio power output stage 41；
The aforementioned set-up mode that power-amplifier stage 4 is directly connected to behind preamplifier state 3 is applicable to A class, B class, AB
The linear power amplifiers such as class, however, the present invention also can further include a driving output stage 5, the driving output stage 5 setting
Between preamplifier state 3 and power-amplifier stage 4, and the driving output stage 5 respectively with preamplifier state 3 and power-amplifier stage 4
It is connected, stops equipped with dead time control (dead time control) circuit 51 and one with this in the driving output stage 5
The voltage level that stagnant time control circuit 51 is electrically connected shifts (level shift) circuit 52, the dead time control circuit
51 and voltage position quasi displacement circuit 52 respectively with the audio in the preamplifier 31 and power-amplifier stage 4 in preamplifier state 3
Power output stage 41 be electrically connected, and the dynamic source voltage switching switch 42 in supply voltage output end 423 also with the electricity
Pressure position quasi displacement circuit 52 is connected, to supply voltage needed for transmitting the voltage position quasi displacement circuit 52, wherein the stagnation
Function of the time control circuit 51 to avoid high side (high side) and downside (low side) in audio power output stage 41
Rate crystal, which simultaneously turns on, causes power supply short circuit, thus voltage position of the voltage position quasi displacement circuit 52 to promote audio signal
Standard, with the power crystal for the high side that smoothly drives, whereby, the present invention may also apply to this switch types of class-D amplifier
Power amplifier, further, if being reconfigured the control of enabled (enabled) state that one is used to switch the driving output stage 5
Circuit, then the present invention, which can further apply, is mixed with the power of linear power amplifier and switch type power amplifier and puts
In big device circuit framework, and then application range and wide usage of the invention can be greatly improved；
One power supply circuit 6, the power supply circuit 6 are specially a kind of adaptive booster type power adapter
(adaptive boost power converter), to when preamplifier state 3 enhance bass audio signal when, to the function
Rate amplifying stage 4 provides a dynamic source voltage for being greater than the fixed power source voltage, to enable the supply voltage of power-amplifier stage 4
Certain surplus (headroom) is enough kept, to maintain enough out-put dynamic ranges, in the present embodiment, power supply supply electricity
Amplitude and detecting phase circuit 61, driving circuit 62 and power output stage 63 are equipped in road 6, wherein the driving circuit
62 include reference voltage control circuit 64, error amplifier bandwidth control circuit 65 and bleeder circuit 66, error amplification
Device bandwidth control circuit 65 is usually made of error amplifier (Error Amplifier) and necessary feedback compensation circuit,
The feedback compensation circuit is generally made of elements such as capacitor, resistance, to regulate and control the bandwidth of the error amplifier
(Bandwidth), the characteristics such as transient response (transient response) and stability, so that error amplifier can be to negative
It carries and obtains preferable balance between the reaction speed of variation and the stability of system, the error amplifier bandwidth control circuit 65 tool
Have first input end 651, the second input terminal 652 and an output end 653, the amplitude and detecting phase circuit 61 respectively with preceding storing
Bass in big grade 3 tightens control the of circuit 32, reference voltage control circuit 64 and error amplifier bandwidth control circuit 65
Two input terminals 652 are electrically connected, and the reference voltage control circuit 64 is also defeated with the first of error amplifier bandwidth control circuit 65
Enter end 651 to be electrically connected, and the output end 653 of the error amplifier bandwidth control circuit 65 and power output stage 63 is defeated
Enter end 631 to be electrically connected, the bleeder circuit 66 be separately connected in a manner of feedback the output end 632 of the power output stage 63 with
Second input terminal 652 of error amplifier bandwidth control circuit 65, but the output end 632 of the power output stage 63 also with it is dynamic
The second source voltage input end 422 that state supply voltage switches switch 42 is electrically connected；
Wherein, the amplitude and detecting phase circuit 61 are to detect via the amplified audio signal of preamplifier state 3
Amplitude (amplitude) and phase (phase), and the amplitude signal detected and phase signal are respectively transmitted and give reference electricity
Pressure control circuit 64 and error amplifier bandwidth control circuit 65, the reference voltage control circuit 64 can be believed according to the amplitude
Number generate corresponding reference voltage (Reference a Voltage, VREF) signal, then the reference voltage signal is transmitted to this
The first input end 651 of error amplifier bandwidth control circuit 65, the feedback inside the error amplifier bandwidth control circuit 65
Compensation circuit can generate and determine that the bandwidth and transient response characteristic of the error amplifier, the error are put according to the phase signal
The output end 653 of big device bandwidth control circuit 65 can generate a corresponding pulse-width control signal and be transmitted according to the signal of input terminal
To power output stage 63, so as to generate the dynamic source voltage simultaneously in the output end 632 of the power output stage 63
Send dynamic source voltage switching switch 42 to；
Illustrate below the working principle of the invention with the utility model has the advantages that as shown in Figure 3 and Figure 4, when audio signal belongs to middle pitch
Or when treble range, the gain which generates is smaller, thus the message power output stage 41 in power-amplifier stage 4
Can be not necessarily to biggish supply voltage, so when dynamic source voltage switching switch 42 can switch its switch state, using with first
The connected fixed power source voltage of power voltage input terminal 421 supplies audio power output stage 41 and voltage position quasi displacement circuit 52
Electricity；When audio signal belongs to bass or supper bass range, the bass tighten control circuit 32 can make preamplifier state 3 generate compared with
Big gain, the amplitude in the power supply circuit 6 and detecting phase circuit 61 can detect biggish amplitude signal at this time, from
And the reference voltage control circuit 64 can produce a biggish reference voltage signal, to dynamically enable power output stage
63 generate the dynamic source voltage big compared with fixed power source voltage, at this point, dynamic source voltage switching switch 42 can switch it again
Switch state makes the dynamic source voltage being connected with second source voltage input end 422 to audio power output stage 41 and voltage
Position quasi displacement circuit 52 is powered, in this way, when preamplifier state 3 strengthens the audio signal of bass and improves its level,
The power supply circuit 6 can synchronize and dynamically promote the supply voltage of audio power output stage 41 to higher level,
To which the power level of order at this time can be remained above the audio signal level of bass, avoid audio output signal caused by wave chopping
Saturation distortion, to realize dynamic power supplies control function, and then can reach the present invention and properties of product and reliable be substantially improved
The effect of spending.
Claims (5)
1. a kind of power amplifier device, characterized by comprising:
One preamplifier state, be equipped in the preamplifier state preamplifier and one in a manner of feedback with the preamplifier
The bass of connection tightens control circuit, the bass tighten control circuit equipped with one first feedback resistance and one with first feedback
The active capacitance multiplier circuit of resistor coupled in parallel；
One power-amplifier stage, the power-amplifier stage is interior to be opened equipped with an audio power output stage and dynamic source voltage switching
It closes, the audio power output stage and preamplifier state are electrically connected, and dynamic source voltage switching switch has one first power supply
Voltage input end, a second source voltage input end and a supply voltage output end, first power voltage input terminal connection
One lesser fixed power source voltage, the supply voltage output end are connected with the audio power output stage；
One power supply circuit, the power supply circuit is interior to be equipped with amplitude and detecting phase circuit, driving circuit and power supply function
Rate output stage, the driving circuit include reference voltage control circuit, error amplifier bandwidth control circuit and bleeder circuit,
The error amplifier bandwidth control circuit has first input end, the second input terminal and output end, the amplitude and detecting phase
Circuit is electrical with the second input terminal of preamplifier state, reference voltage control circuit and error amplifier bandwidth control circuit respectively
The first input end of connection, the reference voltage control circuit and error amplifier bandwidth control circuit is electrically connected, which puts
The output end of big device bandwidth control circuit and the input terminal of power output stage are electrically connected, and the bleeder circuit is in a manner of feedback
It is separately connected the output end of the power output stage and the second input terminal of error amplifier bandwidth control circuit, the power supply function
Second source voltage input end of the output end of rate output stage also with dynamic source voltage switching switch is electrically connected, to generate
One dynamic source voltage bigger than fixed power source voltage.
2. power amplifier device according to claim 1, which is characterized in that the preamplifier is full differential amplifier.
3. power amplifier device according to claim 1, which is characterized in that the bass tightens control circuit equipped with one and this
The second feedback resistance that active capacitance multiplier circuit is connected in series, and the resistance value of second feedback resistance is less than the first feedback electricity
The resistance value of resistance.
4. power amplifier device according to any one of claim 1 to 3, which is characterized in that further include a drive
Dynamic output stage, the driving output stage are set between preamplifier state and power-amplifier stage, and the driving output stage respectively with it is preceding
Amplifying stage is set to be connected with power-amplifier stage.
5. power amplifier device according to claim 4, which is characterized in that be equipped with a dead time in the driving output stage
Control circuit and one with the dead time control circuit be electrically connected voltage position quasi displacement circuit, the dead time control electricity
Road and voltage position quasi displacement circuit are defeated with the audio power in the preamplifier and power-amplifier stage in preamplifier state respectively
Grade is electrically connected out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610007894.6A CN106953608B (en) | 2016-01-06 | 2016-01-06 | Power amplifier device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610007894.6A CN106953608B (en) | 2016-01-06 | 2016-01-06 | Power amplifier device |
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| Publication Number | Publication Date |
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| CN106953608A CN106953608A (en) | 2017-07-14 |
| CN106953608B true CN106953608B (en) | 2019-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610007894.6A Active CN106953608B (en) | 2016-01-06 | 2016-01-06 | Power amplifier device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113329294B (en) * | 2021-05-31 | 2024-03-22 | 昆山海菲曼科技集团股份有限公司 | Audio control chip and earphone |
| CN115567831A (en) * | 2021-06-30 | 2023-01-03 | 华为技术有限公司 | Method and device for improving tone quality of loudspeaker |
| CN115708362A (en) * | 2021-08-19 | 2023-02-21 | 荣耀终端有限公司 | Method for improving sound effect of playing out and related device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101998203A (en) * | 2009-08-24 | 2011-03-30 | 周晓云 | High-performance audio amplifier circuit |
| CN203761338U (en) * | 2014-03-28 | 2014-08-06 | 温州职业技术学院 | Audio power amplifier |
| CN205490435U (en) * | 2016-01-06 | 2016-08-17 | 昱盛电子股份有限公司 | Controllable supply voltage circuit for power amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5742186B2 (en) * | 2010-11-22 | 2015-07-01 | 富士通株式会社 | Amplifier |
-
2016
- 2016-01-06 CN CN201610007894.6A patent/CN106953608B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101998203A (en) * | 2009-08-24 | 2011-03-30 | 周晓云 | High-performance audio amplifier circuit |
| CN203761338U (en) * | 2014-03-28 | 2014-08-06 | 温州职业技术学院 | Audio power amplifier |
| CN205490435U (en) * | 2016-01-06 | 2016-08-17 | 昱盛电子股份有限公司 | Controllable supply voltage circuit for power amplifier |
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Effective date of registration: 20230315 Address after: Taiwan County, Hsinchu city Chinese Chupei Patentee after: VIVA ELECTRONICS Inc. Patentee after: Lin Yuancong Patentee after: Wu Guohong Patentee after: Chen Wenyan Patentee after: Shenzhen Yusheng Global Technology Co.,Ltd. Address before: Jhubei City, Hsinchu County Patentee before: VIVA ELECTRONICS Inc. Patentee before: Lin Yuancong Patentee before: Wu Guohong Patentee before: Chen Wenyan |
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