CN207150542U - A kind of audio-frequency power amplifier - Google Patents
A kind of audio-frequency power amplifier Download PDFInfo
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- CN207150542U CN207150542U CN201721032670.7U CN201721032670U CN207150542U CN 207150542 U CN207150542 U CN 207150542U CN 201721032670 U CN201721032670 U CN 201721032670U CN 207150542 U CN207150542 U CN 207150542U
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- 238000012360 testing method Methods 0.000 description 8
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Abstract
The utility model discloses a kind of audio-frequency power amplifier, including preamplifying circuit, rear class amplifying circuit, signal generator and subtraction circuit；The output end of the signal generator connects the input of the rear class amplifying circuit, and the output end of the rear class amplifying circuit is used for the input for connecting loudspeaker；One input of the subtraction circuit connects the output end of the rear class amplifying circuit, and another input of the subtraction circuit is used for the output end for connecting the loudspeaker；The output end of the subtraction circuit connects the feedback signal reception end of the preamplifying circuit.The utility model solves the problems, such as to cause psycho-acoustic signal not ideal enough due to being difficult to produce the accurate loudspeaker of impedance in the prior art, realizes the parameter of automatic power adjustment amplifier, there is provided the effect of preferable tonequality.
Description
Technical field
The utility model embodiment is related to audio driven technology, more particularly to a kind of audio-frequency power amplifier.
Background technology
In practical application power amplifier, power amplifier needs the matches impedances with loudspeaker, when loudspeaker
When impedance mismatches with power amplifier, it is possible to cause a large amount of heatings of power amplifier or even burn out.But produce impedance
Accurate loudspeaker is, it is necessary to which very high production technology is horizontal, and therefore, the loudspeaker driven by power amplifier is often difficult to
To preferable psycho-acoustic signal.
Utility model content
The utility model provides a kind of audio-frequency power amplifier, to realize the parameter of automatic power adjustment amplifier so that
Power amplifier matches with loudspeaker, there is provided preferable tonequality.
The utility model embodiment provides a kind of audio-frequency power amplifier, including：Preamplifying circuit, rear class amplification electricity
Road, signal generator and subtraction circuit；
The output end of the signal generator connects the input of the rear class amplifying circuit, the rear class amplifying circuit
Output end is used for the input for connecting loudspeaker；
One input of the subtraction circuit connects the output end of the rear class amplifying circuit, the subtraction circuit it is another
One input is used for the output end for connecting the loudspeaker；The output end of the subtraction circuit connects the preamplifying circuit
Feedback signal reception end.
The utility model passes through embedded signal generator and subtraction circuit in audio-frequency power amplifier so that can be in sound
During frequency device power-up, signal generator produce test signal, subtraction circuit extract test signal through rear class amplifying circuit amplification at
By before loudspeaker and by the audio signal after loudspeaker after reason, and it is compared and voltage difference is calculated, feeds back to pair
Audio signal carries out the preamplifying circuit of pre-amplification and feedback adjustment, to control the prime multiplication factor of audio input signal
With the parameter of bandpass filter so that the parameter of power amplifier and the impedance matching of loudspeaker, solve in the prior art due to
The problem of being difficult to produce the accurate loudspeaker of impedance and cause psycho-acoustic signal not ideal enough, realize automatic power adjustment amplifier
Parameter, there is provided the effect of preferable tonequality.
Brief description of the drawings
Fig. 1 is the structural representation for the audio-frequency power amplifier that the utility model embodiment one provides；
Fig. 2 is the structural representation for the audio-frequency power amplifier that the utility model embodiment two provides.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than to restriction of the present utility model.Further need exist for
It is bright, for the ease of description, the part related to the utility model rather than entire infrastructure are illustrate only in accompanying drawing.
Embodiment one
Fig. 1 is the structural representation for the audio-frequency power amplifier that the utility model embodiment one provides.The audio power is put
Big device 10 includes：Preamplifying circuit 110, rear class amplifying circuit 120, signal generator 130 and subtraction circuit 140；Wherein,
The input of the output end connection rear class amplifying circuit 120 of signal generator 130, the output end of rear class amplifying circuit 120 are used for
Connect the input of loudspeaker 20；The output end of the input connection rear class amplifying circuit 120 of subtraction circuit 140, subtraction
Another input of circuit 140 is used for the output end for connecting loudspeaker 20；The output end connection prime amplification of subtraction circuit 140
The feedback signal reception end of circuit 110.
The operation principle of foregoing circuit structure is：Signal generator 130 exports test signal to rear class amplifying circuit 120,
Rear class amplifying circuit 120 is output to the input of the input and loudspeaker 20 of subtraction circuit 140 after test signal is amplified
End；Subtraction circuit 140 also receives the signal of the output end of loudspeaker 20, and the signal that rear class amplifying circuit 120 is exported and raises one's voice
Voltage difference between the signal of the output end of device 20 is sent into the feedback signal reception end of preamplifying circuit.Preamplifying circuit rises
Audio signal pre-amplification and prime multiplication factor and internal pass band filter parameter (including loudspeaker are adjusted according to feedback signal
Maximum non―distortion power, minimum frequency response and the highest frequency response that can bear, the frequency spectrum of each Frequency point of loudspeaker
Optimum impedance curve of curve and loudspeaker etc.) effect, specifically, preamplifying circuit passes through IIC according to feedback signal
Bandpass filter register, EQ inside (Inter-Integrated Circuit, IC bus) setting
(Equalizer, balanced device) and gain parameter register, the audio signal that its preamplifying circuit 110 exports is set to adjust automatically
It is made as the optimum signal for being adapted to loudspeaker 20.If rear end loudspeaker damage simultaneously (disconnecting or short-circuit), pre-amplifier all can be certainly
Dynamic circuit breaker opens output signal, so as to protect power amplifier significantly not generate heat or even burn because backend load is excessive.
The operation principle of foregoing circuit structure performs when being the audio frequency apparatus start for being provided with audio-frequency power amplifier 10
The principle of test process.After being completed, audio-frequency power amplifier 10 can normal work.Further, preamplifying circuit
110 input is used to receive analogue audio frequency, the output end connection rear class amplifying circuit of preamplifying circuit 110.Prime is amplified
Circuit receives output to rear class amplifying circuit after analogue audio frequency carries out pre-amplification and carries out power amplification output.
Preferably, signal generator is pink noise generator.During the frequency component power of pink noise is mainly distributed on
Low-frequency range.In terms of waveform angle, pink noise divides shape, and voice data has same or similar energy in certain scope
Amount.It is the most common noise of nature, therefore is most commonly used to carry out acoustical testing.Further, the pink of the present embodiment is made an uproar
Acoustic frequency is more than 20HZ and is less than 20KHZ, and voltage is more than 0V and is less than 2V.
The technical scheme of the present embodiment, by embedded signal generator and subtraction circuit in audio-frequency power amplifier, make
Obtaining can be when audio frequency apparatus be started shooting, and signal generator produces test signal, and subtraction circuit extraction test signal is amplified through rear class
By before loudspeaker and by the audio signal after loudspeaker after circuit enhanced processing, and it is compared and voltage difference is calculated
Value, the preamplifying circuit for being responsible for that pre-amplification and feedback adjustment are carried out to audio signal is fed back to, to control audio input to believe
Number prime multiplication factor and bandpass filter parameter so that the parameter of power amplifier and the impedance matching of loudspeaker, solution
Certainly realized automatic due to being difficult to produce the accurate loudspeaker of impedance the problem of cause psycho-acoustic signal not ideal enough in the prior art
Adjust the parameter of power amplifier, there is provided the effect of preferable tonequality.
Embodiment two
Fig. 2 is the structural representation for the audio-frequency power amplifier that the utility model embodiment two provides.The present embodiment is upper
On the basis of one embodiment, audio-frequency power amplifier 10 also includes PWM controller 150 and digital modulator 160.
PWM controller 150 is the control circuit for output pwm signal.Digital modulator 160 is by source signal input
Signal load on the signal of carrier signal input, formed modulated signal output device.The audio that the present embodiment provides
Power amplifier, audio signal is modulated using digital modulator, is easy to the transmission of audio signal.Digital modulator 160
It is connected between the output end of preamplifying circuit 110 and the input of rear class amplifying circuit 120；Wherein, digital modulator 160
Source signal input connection preamplifying circuit 110 output end, digital modulator 160 modulated signal output end connection after
The input of level amplifying circuit 120.The carrier signal of the pwm signal output end connection digital modulator 160 of PWM controller 150
Input.
Preferably, what the pwm signal output end of PWM controller 150 exported is the reference clock letter of PWM controller 150
Number.Because carrier signal need not adjust dutycycle, therefore the reference clock signal conduct of PWM controller 150 can be used directly
The carrier signal of voice modulation.
Other pwm signal output ends of PWM controller 150, for example, output can based on having for reference clock signal modulation
The modulated signal output end of control dutycycle may be connected to the DC-DC reduction voltage circuits for each circuit module power supply for audio frequency apparatus
In.
Main switch of the modulated signal output end connection of PWM controller 150 as the Switching Power Supply of DC-DC reduction voltage circuits
Control terminal, can be achieved to reduce interfering for power supply and audio signal in audio frequency apparatus, improve the to-noise ratio of audio output.Tool
Body, for the Switching Power Supply for each circuit module power supply in audio frequency apparatus, it is necessary to which pwm signal controls the duty of main switch
Than voice modulation is also required to carrier wave and analogue audio frequency is modulated.There is provided respectively using two PWM controllers in the prior art
Pwm signal, the problems such as heating and electromagnetic compatibility crosstalk be present.The present embodiment is using the reference clock signal of pwm signal as sound
Frequency modulation carrier wave, using the main switch of modulated signal controlling switch power supply.Therefore so that digital modulator and Switching Power Supply are total to
With a PWM modulator, the modulating frequency of audio is consistent with the modulating frequency of Switching Power Supply, avoids between voice modulation and power supply
Interfered caused by different frequency, also reduce the interference to other signals in audio frequency apparatus, while be avoided that audio is adjusted
Two PWM controllers of system and Switching Power Supply, which are placed on different places, causes the cabling of pcb board is long to cause line loss, can also reduce
PCBA (Printed Circuit Board Assembly, pcb board assembling) usable floor area, reduces production cost.
The technical scheme of the present embodiment, the parameter of automatic power adjustment amplifier, there is provided the effect of preferable tonequality.Together
When, the Switching Power Supply of voice modulation and audio frequency apparatus shares a PWM controller, solves two PWM controllers of prior art
The problem of in the presence of heating and electromagnetic compatibility crosstalk, realize the effect for the to-noise ratio for improving audio output.
It should be noted that in the case of not conflicting, those skilled in the art will can retouch in this specification
The different embodiments or example and the feature of different embodiments or example stated are combined and combined.
Pay attention to, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, other more equivalent embodiments can also be included, and the scope of the utility model is by appended
Right determine.
Claims (6)
1. a kind of audio-frequency power amplifier, it is characterised in that including preamplifying circuit, rear class amplifying circuit, signal generator
And subtraction circuit；
The output end of the signal generator connects the input of the rear class amplifying circuit, the output of the rear class amplifying circuit
Hold the input for connecting loudspeaker；
One input of the subtraction circuit connects the output end of the rear class amplifying circuit, the subtraction circuit another
Input is used for the output end for connecting the loudspeaker；The output end of the subtraction circuit connects the anti-of the preamplifying circuit
Feedback signal receiving terminal.
2. audio-frequency power amplifier as claimed in claim 1, it is characterised in that the input of the preamplifying circuit is used for
Analogue audio frequency is received, the output end of the preamplifying circuit connects the rear class amplifying circuit.
3. audio-frequency power amplifier as claimed in claim 2, it is characterised in that the audio-frequency power amplifier also includes PWM
Controller and digital modulator；
The digital modulator be connected to the preamplifying circuit output end and the rear class amplifying circuit input it
Between；Wherein, the source signal input of the digital modulator connects the output end of the preamplifying circuit, the digital modulation
The modulated signal output end of device connects the input of the rear class amplifying circuit；
The pwm signal output end of the PWM controller connects the carrier signal input of the digital modulator.
4. audio-frequency power amplifier as claimed in claim 3, it is characterised in that the pwm signal output end output is institute
State the reference clock signal of PWM controller.
5. audio-frequency power amplifier as claimed in claim 4, it is characterised in that the audio-frequency power amplifier is installed on audio
In equipment；The audio-frequency power amplifier also includes being used for the Switching Power Supply for audio frequency apparatus power supply；The Switching Power Supply
Including main switch；
The modulated signal output end of the PWM controller connects the control terminal of the main switch.
6. the audio-frequency power amplifier as described in any one of claim 1 to 5, it is characterised in that the signal generator is powder
Red noise generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721032670.7U CN207150542U (en) | 2017-08-17 | 2017-08-17 | A kind of audio-frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721032670.7U CN207150542U (en) | 2017-08-17 | 2017-08-17 | A kind of audio-frequency power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207150542U true CN207150542U (en) | 2018-03-27 |
Family
ID=61665767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721032670.7U Active CN207150542U (en) | 2017-08-17 | 2017-08-17 | A kind of audio-frequency power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207150542U (en) |
-
2017
- 2017-08-17 CN CN201721032670.7U patent/CN207150542U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200407 Address after: 510530 Guangdong city of Guangzhou province YUNPU Whampoa district four Road No. 6 Patentee after: Guangzhou Shiyuan Electronic Technology Company Limited Address before: 510530, No. four, 6, Po Po Road, Yun Po Industrial Zone, Whampoa District, Guangzhou, Guangdong Co-patentee before: GUANGZHOU RAYER ACOUSTIC TECHNOLOGY Co.,Ltd. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |