CN2554871Y - Audio power amplifier of variable output impendance - Google Patents
Audio power amplifier of variable output impendance Download PDFInfo
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- CN2554871Y CN2554871Y CN 02222695 CN02222695U CN2554871Y CN 2554871 Y CN2554871 Y CN 2554871Y CN 02222695 CN02222695 CN 02222695 CN 02222695 U CN02222695 U CN 02222695U CN 2554871 Y CN2554871 Y CN 2554871Y
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- power amplifier
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- audio
- resistance
- utility
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Abstract
The utility model relates to an audio power amplifier with a variable output impedance and comprises a power amplifier (A1). A negative feedback resistance (R2) is connected between the negative input end and the output end of the power amplifier (A1). The utility model is characterized in that the negative input end of the power amplifier (A1) is the signal input end of the audio power amplifier. The output end of the power amplifier (A1) is connected with a load, and then is connected with the ground through a resistance (R4). The positive input end of the power amplifier (A1) is connected with the ground through a capacitance (C2) and then is connected between the load and the resistance (R4) through a resistance (R3). The utility model adopts a very compact structure to improve the output property of the audio power amplifier and realizes an all-band frequency signal output with an excellent output property. The utility model has the advantages of simple structure, low production cost, excellent output property, and wide range of application, perfect applied effect and high cost performance. The utility model is applicable to the equipment that needs an audio power amplifier, such as the multimedia active loudspeaker of an audio, a television, a radio cassette recorder, a radio, a computer and so on.
Description
The utility model relates to a kind of power amplifier device, particularly a kind of audio power amplifying device.
Common various audio power amplifier output impedance are all for just, but their bass frequency range output effect is generally bad.Owing to the Q value of output impedance, reduce the distortion of bass frequency range and the fan-out capability that increases the bass frequency range of loud speaker for negative audio power amplifier energy damping harmonic frequency of loudspeakers place.Therefore, have the active sub-woofer of few part to adopt output impedance to be negative built-in audio power amplifier, but this audio power amplifier is not suitable for the signal output of middle and high audio section.At present, can make output impedance is negative in the bass frequency range, is the report that positive full frequency band audio power amplifier yet there are no application at middle and high audio section.
The purpose of this utility model is: the audio power amplifier that a kind of output impedance varying is provided.It can make audio power amplifier manifest negative output impedance in the bass frequency range in full frequency band signal output procedure, manifests positive output impedance at middle and high audio section, has extraordinary output characteristic.
The utility model is achieved in that the audio power amplifier of output impedance varying, comprises power amplifier A1, is connected to negative feedback resistor R2 between the negative input end of power amplifier A1 and its output; It is characterized in that: the negative input end of power amplifier A1 is the signal input part of audio power amplifier; The output termination load of power amplifier A1 is after resistance R 4 ground connection; The positive input terminal of power amplifier A1 is connected between load and the resistance R 4 through capacitor C 2 ground connection and through resistance R 3.
In the audio power amplifier of above-mentioned output impedance varying, the corner frequency that capacitor C 2 and resistance R 3 constitute preferably is not more than 1000 hertz.
Compared with the prior art, the output characteristic of audio power amplifier that the utility model has adopted very succinct architecture advances has realized the extraordinary full frequency band signal output of output characteristic.The utility model has been because requirement has reduced to the Q value of loud speaker, and the requirement of speaker system has also been reduced, and the volume of audio amplifier is reduced significantly.The cost of manufacture of stereo set is reduced, also can improve the tonequality of the equipment such as multimedia active audio amplifier of television set, radio-cassette player, broadcast receiver, computer at low cost.Have simple in structurely, cost of manufacture is low, good output, and applied range, effect is good, the characteristics that the ratio of performance to price is high.Can need the equipment of audio power amplifier to use for the multimedia active audio amplifier of sound equipment, television set, radio-cassette player, broadcast receiver, computer etc.
Below in conjunction with accompanying drawing embodiment of the present utility model is further described.
Accompanying drawing 1 is an electrical block diagram of the present utility model;
Accompanying drawing 2 is circuit theory diagrams that the utility model adopts dual power supply embodiment;
Accompanying drawing 3 is circuit theory diagrams that the utility model adopts single power supply embodiment.
Embodiment: as shown in Figure 1, the audio power amplifier of output impedance varying comprises power amplifier A1, is connected to negative feedback resistor R2 between the negative input end of power amplifier A1 and its output.Characteristics are: the negative input end of power amplifier A1 is the signal input part of audio power amplifier; The output termination loudspeaker R of power amplifier A1 is after resistance R 4 ground connection; The positive input terminal of power amplifier A1 is connected between load and the resistance R 4 through capacitor C 2 ground connection and through resistance R 3.Corner frequency (the 1/2 π R that constitutes of capacitor C 2 and resistance R 3 wherein
3C
2) preferably be not more than 1000 hertz.
Accompanying drawing 2 is that the utility model is applied to the circuit theory diagrams under the dual power supply situation; Accompanying drawing 3 is that the utility model is applied to the circuit theory diagrams under the single power supply situation.They all are to have increased capacitor C 2 and resistance R 3, R4 on original circuit base.Audio power amplifier for single power supply need increase a capacitance C3.
The audio power amplifier of output impedance varying is because the bass frequency range adopts big loop positive feedback, and middle and high frequency range does not have big loop positive feedback.So can make audio power amplifier in full frequency band signal output procedure, manifest negative output impedance in the bass frequency range, manifest positive output impedance at middle and high audio section, have extraordinary output characteristic.
Claims (2)
1, the audio power amplifier of output impedance varying comprises power amplifier A1, is connected to negative feedback resistor R2 between power amplifier A1 negative input end and its output; It is characterized in that: the negative input end of power amplifier A1 is the signal input part of audio power amplifier; The output termination load of power amplifier A1 is after resistance R 4 ground connection; The positive input terminal of power amplifier A1 is connected between load and the resistance R 4 through capacitor C 2 ground connection and through resistance R 3.
2, the audio power amplifier of output impedance varying according to claim 1 is characterized in that: the corner frequency that capacitor C 2 and resistance R 3 constitute is not more than 1000 hertz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02222695 CN2554871Y (en) | 2002-05-21 | 2002-05-21 | Audio power amplifier of variable output impendance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02222695 CN2554871Y (en) | 2002-05-21 | 2002-05-21 | Audio power amplifier of variable output impendance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2554871Y true CN2554871Y (en) | 2003-06-04 |
Family
ID=33700547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02222695 Expired - Fee Related CN2554871Y (en) | 2002-05-21 | 2002-05-21 | Audio power amplifier of variable output impendance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2554871Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100547909C (en) * | 2005-08-17 | 2009-10-07 | 因特格瑞特科技有限公司 | Improve the amplifier circuit of the linearity and frequency band |
| US11381908B2 (en) | 2017-08-01 | 2022-07-05 | Michael James Turner | Controller for an electromechanical transducer |
-
2002
- 2002-05-21 CN CN 02222695 patent/CN2554871Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100547909C (en) * | 2005-08-17 | 2009-10-07 | 因特格瑞特科技有限公司 | Improve the amplifier circuit of the linearity and frequency band |
| US11381908B2 (en) | 2017-08-01 | 2022-07-05 | Michael James Turner | Controller for an electromechanical transducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |