CN201008135Y - Audio frequency power amplifier with voltage current negative feedback regulation function - Google Patents
Audio frequency power amplifier with voltage current negative feedback regulation function Download PDFInfo
- Publication number
- CN201008135Y CN201008135Y CNU2007201036434U CN200720103643U CN201008135Y CN 201008135 Y CN201008135 Y CN 201008135Y CN U2007201036434 U CNU2007201036434 U CN U2007201036434U CN 200720103643 U CN200720103643 U CN 200720103643U CN 201008135 Y CN201008135 Y CN 201008135Y
- Authority
- CN
- China
- Prior art keywords
- potentiometer
- feedback
- negative feedback
- resistance
- power amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses an audio frequency power amplifier with voltage and current feedback adjusting function, which comprises a power amplifying circuit and a feedback network, wherein the feedback network is connected between the reverse input end and output end of the power amplifying circuit, the feedback network comprises a first potentiometer for controlling the inverse feedback configuration, a second potentiometer for adjusting radio of the output and input value and two resistances, one resistance is connected between the power amplifying circuit reverse input end and earth, the first potentiometer is connected with the output end of the power amplifying circuit through the second potentiometer on one end and is earthed on the other end, the sliding end of the second potentiometer is connected with reverse input end of the power amplifying circuit by another resistance, and two ends of the second potentiometer are loaded. The utility model can lead in different feedback configuration. When the lead in voltage and current is of negative feedback, the utility model can decrease the influence of the moving-conductor loudspeaker reverse electric potential, which makes the loudspeaker in best working condition and better restores the radio frequency input signal.
Description
Technical field
The utility model relates to a kind of audio-frequency power amplifier, specifically, relates to a kind of audio-frequency power amplifier with electric current and voltage negative feedback regulatory function.
Background technology
Known sound system has adopted audio power amplifying circuit as shown in Figure 1, introduced the Voltage Series negative feedback in this circuit, feedback network is made up of resistance R 1 and R2, resistance R 1 is connected between the inverting input and ground of power amplification circuit A, resistance R 2 is connected between the inverting input and output of power amplification circuit A, load loud speaker SP is connected between the output and ground of power amplification circuit A, output voltage u
oBe approximately equal to (1+R
2/ R
1) u
i, i.e. R
1And R
2Value determine u then
oBe decided by u
iThis voltage negative feedback circuit shows as controlled constant pressure source, and the back-emf that electromagnetism moving-coil speaker SP produces can be offset the part drive current, makes loud speaker SP can not reduce audio signal well.
The utility model content
The purpose of this utility model provides a kind of audio-frequency power amplifier with electric current and voltage negative feedback regulatory function, by regulating voltage negative feedback quantity and the Current Negative Three-Point Capacitance amount in this audio-frequency power amplifier, so that speaker operation is in optimum state.
For achieving the above object, the utility model has adopted following technical scheme:
A kind of audio-frequency power amplifier with electric current and voltage negative feedback regulatory function, it is made up of power amplification circuit and feedback network, and feedback network is connected between the inverting input and output of power amplification circuit, it is characterized in that:
Described feedback network is made of second potentiometer and two resistance of first potentiometer, adjusting output variable and the input variable ratio of control negative feedback configuration, one resistance is connected between the inverting input and ground of described power amplification circuit, one end of first potentiometer joins through the output of second potentiometer and described power amplification circuit, the other end ground connection of first potentiometer, the sliding end of second potentiometer connects the inverting input of described power amplification circuit, two termination loads of second potentiometer through another resistance.
Effective resistance of the described first potentiometer place in circuit is greater than zero.
By regulating two potentiometers in the feedback network, the utility model can present different negative feedback configurations, thereby realize the purpose of regulation voltage amount of negative feedback and Current Negative Three-Point Capacitance amount, particularly when this audio-frequency power amplifier is introduced electric current and voltage mixing negative feedback, this audio-frequency power amplifier has the effect that reduces the influence of electromagnetism moving-coil speaker back-emf, make loud speaker be in optimum Working, with the audio input signal reduction, reach high-fidelity electroacoustic result of broadcast better.
Description of drawings
Fig. 1 is known audio power amplifying circuit schematic diagram;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 2, the utility model audio-frequency power amplifier is made up of power amplification circuit A and feedback network, power amplification circuit A is integrated amplifier or is made of discrete component, feedback network is connected between the inverting input and output of power amplification circuit A, and feedback network is by the first potentiometer R of control negative feedback configuration
W1, regulate the second potentiometer R of output variable and input variable ratio
W2With two resistance R
1, R
2Constitute a resistance R
1Be connected between the inverting input and ground of power amplification circuit A the first potentiometer R
W1An end through the second potentiometer R
W2Join the first potentiometer R with the output of power amplification circuit A
W1Other end ground connection, the second potentiometer R
W2Sliding end through another resistance R
2Connect the inverting input of power amplification circuit A, the second potentiometer R
W2Two termination load loud speaker SP.
In Fig. 2, by regulating the first potentiometer R
W1With the second potentiometer R
W2Sliding end, can make this audio-frequency power amplifier have different negative feedback configurations, and output voltage u
o(or output current i
o) and input voltage u
iRatio also change.Specifically describe as follows:
If the first potentiometer R
W1Effective resistance of place in circuit is R
W1', the second potentiometer R
W2The inverting input and the effective resistance between output that are connected to power amplification circuit A are R
W2', the resistance of load loud speaker SP is R
L
As the first potentiometer R
W1Effective resistance R of place in circuit
W1' be 0 (to be equivalent to the second potentiometer R
W2Two be terminated between the output and ground of power amplification circuit A) time, this audio-frequency power amplifier is for introducing Voltage Series negative feedback, output voltage u
oWith input voltage u
iRatio u
o/ u
iFor about R
W2' and R
LFunction f (R
W2', R
L), regulate the second potentiometer R
W2U just can be adjusted in the position of sliding end
o/ u
iRatio.
As the first potentiometer R
W1Effective resistance R of place in circuit
W1' when being maximum value own, this audio-frequency power amplifier is for introducing electric current series connection negative feedback, output current i
o(be u
iWith R
LRatio because i
oThe flow direction can change, so not shown i
o) and input voltage u
iRatio i
o/ u
iFor about R
W2' and R
LFunction f (R
W2', R
L), regulate the second potentiometer R
W2I just can be adjusted in the position of sliding end
o/ u
iRatio.
As the first potentiometer R
W1Effective resistance R of place in circuit
W1' between 0 and maximum value between the time, this audio-frequency power amplifier reduces the effect that electromagnetism moving-coil speaker SP back-emf influences for introducing electric current and voltage mixings negative feedback, having.By regulating the first potentiometer R
W1With the second potentiometer R
W2The position of sliding end, ratio i
o/ u
i(or u
o/ u
i) according to function f (R
W1', R
W2', R
L) with R
W1', R
W2' and R
LAnd change, thereby loud speaker SP is cooperated better with power amplification circuit A, make loud speaker SP be in best operating point, have better tonequality performance.
As the first potentiometer R
W1Effective resistance R of place in circuit
W1' be 0 o'clock, the second potentiometer R
W2Be connected to the inverting input of power amplification circuit A and the resistance R between the output
W2' should be less than the second potentiometer R
W2Maximum value.In actual applications, the first potentiometer R
W1Effective resistance of place in circuit should be set at greater than 0.
i
o/ u
iOr u
o/ u
iRatio not only depend on the first potentiometer R
W1With the second potentiometer R
W2Effective resistance of place in circuit is also with the resistance R of loud speaker SP
LRelevant.During concrete enforcement,, match and regulate two potentiometer R according to the requirement that different loud speaker SP play power demand
W1, R
W2The position of sliding end just can obtain required voltage negative feedback quantity and Current Negative Three-Point Capacitance amount, various audio input signals is amplified, so that loud speaker SP plays out best acoustical quality.
The utility model has the advantages that: by regulating first and second potentiometer in the feedback network, the utility model can present different negative feedback configurations, thereby realize the purpose of regulation voltage amount of negative feedback and Current Negative Three-Point Capacitance amount, particularly when this audio-frequency power amplifier is introducing electric current and voltage mixing negative feedback state, this audio-frequency power amplifier has the effect that reduces the influence of electromagnetism moving-coil speaker back-emf, can make the electromagnetism moving-coil speaker be in optimum Working, with the audio input signal reduction, reach high-fidelity electroacoustic result of broadcast better.
The above is concrete enforcement example of the present utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection range.
Claims (2)
1. audio-frequency power amplifier with electric current and voltage negative feedback regulatory function, it is made up of power amplification circuit and feedback network, and feedback network is connected between the inverting input and output of power amplification circuit, it is characterized in that:
Described feedback network is made of second potentiometer and two resistance of first potentiometer, adjusting output variable and the input variable ratio of control negative feedback configuration, one resistance is connected between the inverting input and ground of described power amplification circuit, one end of first potentiometer joins through the output of second potentiometer and described power amplification circuit, the other end ground connection of first potentiometer, the sliding end of second potentiometer connects the inverting input of described power amplification circuit, two termination loads of second potentiometer through another resistance.
2. audio-frequency power amplifier according to claim 1 is characterized in that:
Effective resistance of the described first potentiometer place in circuit is greater than zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201036434U CN201008135Y (en) | 2007-02-15 | 2007-02-15 | Audio frequency power amplifier with voltage current negative feedback regulation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201036434U CN201008135Y (en) | 2007-02-15 | 2007-02-15 | Audio frequency power amplifier with voltage current negative feedback regulation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201008135Y true CN201008135Y (en) | 2008-01-16 |
Family
ID=39004084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201036434U Expired - Fee Related CN201008135Y (en) | 2007-02-15 | 2007-02-15 | Audio frequency power amplifier with voltage current negative feedback regulation function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201008135Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595355A (en) * | 2013-11-25 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Constant-current bias system of microwave amplifier |
| CN108235186A (en) * | 2017-12-29 | 2018-06-29 | 广州时艺音响科技有限公司 | Feedback output loud speaker and feedback output adjusting method |
| CN111044780A (en) * | 2019-12-10 | 2020-04-21 | 上海艾为电子技术股份有限公司 | Digital audio power amplifier circuit and current sampling control circuit thereof |
| CN112036870A (en) * | 2020-08-27 | 2020-12-04 | 武汉奇致激光技术股份有限公司 | Non-contact IC card for playing audio and control method |
-
2007
- 2007-02-15 CN CNU2007201036434U patent/CN201008135Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595355A (en) * | 2013-11-25 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Constant-current bias system of microwave amplifier |
| CN103595355B (en) * | 2013-11-25 | 2016-08-17 | 中国电子科技集团公司第四十一研究所 | A kind of microwave amplifier constant biasing system |
| CN108235186A (en) * | 2017-12-29 | 2018-06-29 | 广州时艺音响科技有限公司 | Feedback output loud speaker and feedback output adjusting method |
| CN108235186B (en) * | 2017-12-29 | 2021-08-06 | 广州时艺音响科技有限公司 | Feedback output speaker and feedback output adjusting method |
| CN111044780A (en) * | 2019-12-10 | 2020-04-21 | 上海艾为电子技术股份有限公司 | Digital audio power amplifier circuit and current sampling control circuit thereof |
| CN112036870A (en) * | 2020-08-27 | 2020-12-04 | 武汉奇致激光技术股份有限公司 | Non-contact IC card for playing audio and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080116 Termination date: 20150215 |
|
| EXPY | Termination of patent right or utility model |