CN205647452U - Audio power amplifier based on servo drive - Google Patents
Audio power amplifier based on servo drive Download PDFInfo
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- CN205647452U CN205647452U CN201620412928.5U CN201620412928U CN205647452U CN 205647452 U CN205647452 U CN 205647452U CN 201620412928 U CN201620412928 U CN 201620412928U CN 205647452 U CN205647452 U CN 205647452U
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Abstract
The utility model discloses an audio power amplifier based on servo drive, including signal input level, comparator, high power switch circuit, LC low pass filter and the load that connects gradually. Its audio output method is that incoming signal enlargies the processing by the signal input level with incoming signal earlier to input the normal phase end of comparator, the analog signal who comes from the high power switch circuit carries to the inverting terminal of comparator, inverting terminal's the voltage and the voltage of normal phase end carry out the comparison and produce elementary PWM signal, drive circuit in the rethread high power switch circuit is transformed into high -power PWM signal, eliminate the interference component in the high -power PWM signal through LC low pass filter to carry to the load. Compare with traditional audio power amplifier, this audio power amplifier output tone quality is better, and the range of application is wider.
Description
Technical field
This utility model relates to audio frequency export technique field, particularly to a kind of audio frequency merit based on servo-drive
Rate amplifier.
Background technology
Traditional audio-frequency power amplifier, in the application of real life, is usually present following deficiency:
(1) efficiency is low, and the power of its output is difficult to meet the demand of modern advanced audio；
(2) relatively big due to the power tube internal resistance in analog amplifier, so at the speaker of the different resistance of coupling
Time, the duty of analog amplifier circuit can be affected by load (i.e. speaker) size, output shakiness
Fixed；
(3) the many existence of conventional audio power amplifier are due to pipe pairing and the mistake of the best generation of adjustment at different levels
Zero, the phenomenon such as intermodulation distortion, there is also simultaneously and causes due to the transistor nonlinear characteristic when small area analysis
The distortion phenomenon at the positive and negative infall of output waveform；
(4) high-power output needs huge cooling system to do backing, but when system organization structure is bigger,
The family AV requirement to equipment cannot be met, therefore, it is difficult to be applied.
(5) D type digital power amplifier uses high frequency triangle zig-zag form, owing to the frequency in cycle is fixed,
Overshoot cannot be revised.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that a kind of output tonequality is good, application
The audio-frequency power amplifier based on servo-drive that scope is wide.
The technical solution of the utility model is: a kind of audio-frequency power amplifier based on servo-drive, including depending on
The signal input stage of secondary connection, comparator, high-power switching circuit, LC low pass filter and load；
Signal input stage, for processing the various sound source signals of the audio-frequency power amplifier as input signal, carries
High cmrr and capacity of resisting disturbance；
Comparator is used for exporting positive pulse or negative pulse, to drive high-power switching circuit；Level when positive
During higher than reverse level, export positive pulse；When the level of positive is less than reverse level, the negative arteries and veins of output
Punching；
High-power switching circuit output two paths of signals, a road is to be reverted to by the shaping of highpowerpulse electric current
The audio signal identical with input signal is supplied to load, and another road is for restoring by integrator and inputting letter
Number become identical amplitude analog signals be supplied to comparator；
LC low pass filter, for eliminating the interference component of high-power pwm signal, provides audio frequency for load
Drive electric current.
Described high-power switching circuit includes amplifying circuit and the drive circuit being connected；Amplifying circuit output sound
Frequently signal and analog signals, audio signal is delivered to load, analog signals by LC low pass filter
It is delivered to comparator；The primary pwm signal modulated through comparator is changed into high-power by drive circuit
Pwm signal.
Being provided with integrator in described amplifying circuit, integrator for being reduced into the mould of identical amplitude by input signal
Analog quantity signal.
It is additionally provided with protection circuit, in being used for preventing audio-frequency power amplifier between described load and comparator module
Circuit breaks down and load is produced impact.
Described LC low pass filter includes two Butterworth filters being connected, two Butterworth filters
Ripple device provides audio driven electric current for load, and Butterworth filter ensure that the smooth frequency response in full frequency band,
Audio-frequency power amplifier can be made to have good dynamic response.
Described audio-frequency power amplifier external three-phase speed-sensitive switch power supply, for each electricity in audio-frequency power amplifier
Road unit provides galvanic current source.
Described load is speaker.
Being provided with operational amplifier in described signal input stage, this operational amplifier uses differential amplifying circuit,
The various sound source signals of input power amplifier are processed, it is provided that common mode rejection ratio and capacity of resisting disturbance.
The audio-frequency inputting method of above-mentioned audio-frequency power amplifier based on servo-drive, comprises the following steps:
(1) sound source signal as input signal is introduced into signal input stage, will input by signal input stage
Signal is amplified processing, and is input to the positive terminal of comparator；
(2) analog signals from high-power switching circuit is delivered to the end of oppisite phase of comparator；
(3) voltage of end of oppisite phase and the voltage of positive terminal compare, and make the state of comparator overturn
And it is modulated into primary pwm signal；
(4) the primary pwm signal that step (3) produces is by the drive circuit in high-power switching circuit
It is transformed into high-power pwm signal；
(5) eliminate the interference component in high-power pwm signal by LC low pass filter, and carry
To load.
Wherein, high-power switching circuit have employed four MOSFET, exports two paths of signals, leads up to
The shaping of highpowerpulse electric current reverts to the audio signal identical with input signal, separately leads up to integrator
Restore the analog signals becoming identical amplitude with input signal, but due to the existence of integrating circuit, away from sound
Frequently some frequency range of signal can produce phase contrast, when this phase contrast is sufficiently large, whole circuit can be made to produce
Concussion, but unfixing concussion frequency, compare than general digital power amplifier, can obtain bigger driving
Ability.
This audio-frequency power amplifier, based on Servo Drive Technology's, utilizes PFM Yu PWM (i.e. width and frequency
Rate) complex modulated switching regulator, there is no fixing sample frequency, its carrier pulse modulation width is with signal
Replicating change and change, concrete principle is: when input signal is zero, due to making an uproar of circuit components self
Sound or error, make Second Order Integral circuit produce delayed phase 180 degree on a certain frequency, the error of comparator
Play pendulum, thus make oneself state anyway overturn, produce positive pulse or negative pulse, thus drive
On-off circuit produces state upset, and this pulse signal is formed and compared with input signal by integrating circuit
Relatively, when the state driving on-off circuit makes the pulse amplifying of this circuit, this pulse signal warp being exaggerated
Cross integrator and restore corresponding analog signals, and the end of oppisite phase delivering to comparator continues to enter with input signal
Row compares；When the voltage height of the voltage ratio positive terminal of end of oppisite phase, there is upset thus drive in comparator state
On-off circuit, owing to integrator exists signal lag at front end, can be produced from Induced Oscillation in circuit, from
The mid frequency of Induced Oscillation will be determined by integrating circuit.
This utility model, relative to prior art, has the advantages that
Servo Drive Technology's is successfully applied to the drive system of speaker by this audio-frequency power amplifier, with tradition
Audio-frequency power amplifier compare, eliminate triangular wave sampling frequency, utilize low pass filter to produce
Phase shift, does not has fixing carrier frequency, and high-power switching circuit can be at faster speed by output bias value
Revise in the opposite direction.Overcome class-D amplifier distortion big, due to the frequency in cycle fix and cannot
Revising the phenomenon of overshoot, also overcoming conventional switch circuit needs the next cycle waiting clock signal to go to repair
Positive defect.So that the sound location of this audio-frequency power amplifier output is apparent, sound field is broader.
Accompanying drawing explanation
Fig. 1 is the principle schematic of this audio-frequency power amplifier.
Fig. 2 is the circuit theory schematic diagram of signal input stage and comparator.
Fig. 3 is the principle schematic of amplifying circuit in high-power switching circuit.
Fig. 4 is the principle schematic of drive circuit in high-power switching circuit.
Fig. 5 is the principle schematic of protection circuit.
The electric power system circuit theory diagrams that Fig. 6 provides for three-phase speed-sensitive switch power supply.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described in further detail, but of the present utility model
Embodiment is not limited to this.
Embodiment
A kind of audio-frequency power amplifier based on servo-drive of the present embodiment, as it is shown in figure 1, include connecting successively
Signal input stage, comparator, high-power switching circuit, LC low pass filter and the load connect；
Signal input stage, for processing the various sound source signals of the audio-frequency power amplifier as input signal, carries
High cmrr and capacity of resisting disturbance；
Comparator is used for exporting positive pulse or negative pulse, to drive high-power switching circuit；Level when positive
During higher than reverse level, export positive pulse；When the level of positive is less than reverse level, the negative arteries and veins of output
Punching；
High-power switching circuit output two paths of signals, a road is to be reverted to by the shaping of highpowerpulse electric current
The audio signal identical with input signal is supplied to load, and another road is for restoring by integrator and inputting letter
Number become identical amplitude analog signals be supplied to comparator；
LC low pass filter, for eliminating the interference component of high-power pwm signal, provides audio frequency for load
Drive electric current.
Wherein, high-power switching circuit includes the amplifying circuit (its circuit theory is as shown in Figure 3) being connected
With drive circuit (its circuit theory is as shown in Figure 4)；Amplifying circuit output audio signal and analog signals,
Audio signal is delivered to load by LC low pass filter, and analog signals is delivered to comparator；Drive electricity
The primary pwm signal modulated through comparator is changed into high-power pwm signal by road.
Being provided with integrator in amplifying circuit, integrator for being reduced into the analog quantity of identical amplitude by input signal
Signal.
It is additionally provided with protection circuit (its circuit theory is as shown in Figure 5) between load and comparator module, is used for
Prevent audio-frequency power amplifier internal circuit from breaking down on load and produce impact.This protection circuit can use with existing
There is the protection circuit that audio-frequency power amplifier is identical.
LC low pass filter includes two Butterworth filters being connected, two Butterworth filters
Thering is provided audio driven electric current for load, Butterworth filter ensure that the smooth frequency response in full frequency band, can make
Audio-frequency power amplifier has good dynamic response.
Audio-frequency power amplifier external three-phase speed-sensitive switch power supply (electric power system principle such as Fig. 6 institute of formation
Show), provide galvanic current source for each circuit unit in audio-frequency power amplifier.
Load is speaker.
Being provided with operational amplifier in signal input stage, this operational amplifier uses differential amplifying circuit, to defeated
The various sound source signals entering power amplifier process, it is provided that common mode rejection ratio and capacity of resisting disturbance.Such as figure
Shown in 2, the circuit theory being connected with comparator for signal input stage.
The audio-frequency inputting method of above-mentioned audio-frequency power amplifier based on servo-drive, comprises the following steps:
(1) sound source signal as input signal is introduced into signal input stage, will input by signal input stage
Signal is amplified processing, and is input to the positive terminal of comparator；
(2) analog signals from high-power switching circuit is delivered to the end of oppisite phase of comparator；
(3) voltage of end of oppisite phase and the voltage of positive terminal compare, and make the state of comparator overturn
And it is modulated into primary pwm signal；
(4) the primary pwm signal that step (3) produces is by the drive circuit in high-power switching circuit
It is transformed into high-power pwm signal；
(5) eliminate the interference component in high-power pwm signal by LC low pass filter, and carry
To load.
Wherein, high-power switching circuit have employed four MOSFET, exports two paths of signals, leads up to
The shaping of highpowerpulse electric current reverts to the audio signal identical with input signal, separately leads up to integrator
Restore the analog signals becoming identical amplitude with input signal, but due to the existence of integrating circuit, away from sound
Frequently some frequency range of signal can produce phase contrast, when this phase contrast is sufficiently large, whole circuit can be made to produce
Concussion, but unfixing concussion frequency, compare than general digital power amplifier, can obtain bigger driving
Ability.
This audio-frequency power amplifier, based on Servo Drive Technology's, utilizes PFM Yu PWM (i.e. width and frequency
Rate) complex modulated switching regulator, there is no fixing sample frequency, its carrier pulse modulation width is with signal
Replicating change and change, concrete principle is: when input signal is zero, due to making an uproar of circuit components self
Sound or error, make Second Order Integral circuit produce delayed phase 180 degree on a certain frequency, the error of comparator
Play pendulum, thus make oneself state anyway overturn, produce positive pulse or negative pulse, thus drive
On-off circuit produces state upset, and this pulse signal is formed and compared with input signal by integrating circuit
Relatively, when the state driving on-off circuit makes the pulse amplifying of this circuit, this pulse signal warp being exaggerated
Cross integrator and restore corresponding analog signals, and the end of oppisite phase delivering to comparator continues to enter with input signal
Row compares；When the voltage height of the voltage ratio positive terminal of end of oppisite phase, there is upset thus drive in comparator state
On-off circuit, owing to integrator exists signal lag at front end, can be produced from Induced Oscillation in circuit, from
The mid frequency of Induced Oscillation will be determined by integrating circuit.
As it has been described above, just can preferably realize this utility model, above-described embodiment be only of the present utility model relatively
Good embodiment, is not used for limiting practical range of the present utility model；The most all made according to this utility model content
Impartial change with modify, all contained by this utility model claim scope required for protection.
Claims (8)
1. audio-frequency power amplifier based on servo-drive, it is characterised in that include the signal being sequentially connected with
Input stage, comparator, high-power switching circuit, LC low pass filter and load；
Signal input stage, for processing the various sound source signals of the audio-frequency power amplifier as input signal, carries
High cmrr and capacity of resisting disturbance；
Comparator is used for exporting positive pulse or negative pulse, to drive high-power switching circuit；Level when positive
During higher than reverse level, export positive pulse；When the level of positive is less than reverse level, the negative arteries and veins of output
Punching；
High-power switching circuit output two paths of signals, a road is to be reverted to by the shaping of highpowerpulse electric current
The audio signal identical with input signal is supplied to load, and another road is for restoring by integrator and inputting letter
Number become identical amplitude analog signals be supplied to comparator；
LC low pass filter, for eliminating the interference component of high-power pwm signal, provides audio frequency for load
Drive electric current.
Audio-frequency power amplifier based on servo-drive the most according to claim 1, it is characterised in that
Described high-power switching circuit includes amplifying circuit and the drive circuit being connected；Amplifying circuit output audio frequency letter
Number and analog signals, audio signal by LC low pass filter be delivered to load, analog signals carry
To comparator；The primary pwm signal modulated through comparator is changed into high-power PWM by drive circuit
Signal.
Audio-frequency power amplifier based on servo-drive the most according to claim 2, it is characterised in that
It is provided with integrator in described amplifying circuit.
Audio-frequency power amplifier based on servo-drive the most according to claim 1, it is characterised in that
It is additionally provided with protection circuit between described load and comparator module.
Audio-frequency power amplifier based on servo-drive the most according to claim 1, it is characterised in that
Described LC low pass filter includes two Butterworth filters being connected.
Audio-frequency power amplifier based on servo-drive the most according to claim 1, it is characterised in that
Described audio-frequency power amplifier external three-phase speed-sensitive switch power supply.
Audio-frequency power amplifier based on servo-drive the most according to claim 1, it is characterised in that
Described load is speaker.
Audio-frequency power amplifier based on servo-drive the most according to claim 1, it is characterised in that
It is provided with operational amplifier in described signal input stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620412928.5U CN205647452U (en) | 2016-05-06 | 2016-05-06 | Audio power amplifier based on servo drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620412928.5U CN205647452U (en) | 2016-05-06 | 2016-05-06 | Audio power amplifier based on servo drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205647452U true CN205647452U (en) | 2016-10-12 |
Family
ID=57050103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620412928.5U Active CN205647452U (en) | 2016-05-06 | 2016-05-06 | Audio power amplifier based on servo drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205647452U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844515A (en) * | 2022-03-25 | 2022-08-02 | 中国电子科技集团公司第二十九研究所 | Device and method for improving high-power output signal frequency spectrum quality of broadband electronic equipment |
-
2016
- 2016-05-06 CN CN201620412928.5U patent/CN205647452U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844515A (en) * | 2022-03-25 | 2022-08-02 | 中国电子科技集团公司第二十九研究所 | Device and method for improving high-power output signal frequency spectrum quality of broadband electronic equipment |
| CN114844515B (en) * | 2022-03-25 | 2023-08-29 | 中国电子科技集团公司第二十九研究所 | Device and method for improving high-power output signal spectrum quality of broadband electronic equipment |
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| GR01 | Patent grant |