CN2257105Y - Voice frequency power amplifier without capacitor - Google Patents
Voice frequency power amplifier without capacitor Download PDFInfo
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- CN2257105Y CN2257105Y CN 95242552 CN95242552U CN2257105Y CN 2257105 Y CN2257105 Y CN 2257105Y CN 95242552 CN95242552 CN 95242552 CN 95242552 U CN95242552 U CN 95242552U CN 2257105 Y CN2257105 Y CN 2257105Y
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Abstract
The utility model discloses an audio power amplifier which is characterized in that the circuit from an input end to the power output end can be formed by crystal diodes, crystal triodes and resistors; a capacitor is not needed; the additional capacitor can be thoroughly eliminated. The output end can be fed back to the negative input end by resistor voltage division. A symmetry type complementary DC coupling circuit is adopted to overcome the defects of large volume of complete machine, poor stability amplifier, easy distortion and high noise. The amplifier has the advantages of high stability, wide voltage range, little power consumption, large output power, strong load ability, high electric energy conversion efficiency, little distortion, wide frequency response, few elements, small size, etc.
Description
The utility model relates to the audio power amplifying technique, is that the complementary symmetrical expression of a kind of transistor does not have the electric capacity audio-frequency power amplifier.
Existing audio-frequency power amplifier, no matter be electron tube might as well, transistorized or integrated device might as well, all be unable to do without capacitor, as: input capacitance, output capacitance, feedback filtering electric capacity, bypass condenser, bootstrap capacitor or the like, because the existence of these electric capacity makes the LF-response of amplifier, 100 hertz following LF-response strain differential particularly, even lose amplifying power, so, people try every means again and are compensated, as: at the balanced network that promotes of prestage adjunction multiband, height frequency division device amplifies measures such as ultra-low frequency playback.But not only these measures fail to tackle the problem at its root, and reverse side has increased volume and cost, has consumed electric energy in vain, makes circuit more complicated, even has introduced new distortion and noise.Simultaneously, owing to the existence of electric capacity, circuit and stability and voltage endurance capability are restricted, thereby can not increase substantially operating voltage, thereby can not guarantee that device obtains big dynamic range, the big signal of amplitude that changes by chance easily produces distortion.Simultaneously, be unfavorable for dwindling machine volume, at first be that main is that the device of working under low-voltage requires height to current ripples, thereby filter capacitor is big because amplifier electric capacity volume is big, show according to test and practice, 50 volts of following working powers want 1000 microfarads could remove hum at least, and 100 volts of above 100 microfarads even littler just passable that need only, and because after improving voltage, current carrying capacity of conductor to power transformer requires to reduce, and also makes the power unit volume greatly reduce.If under high voltage, we cancel power transformer, make superaudio switching regulator stabilized voltage power supply into, then volume and cost will descend significantly, and therefore, it is big improving its meaning of operating voltage.About the audio-frequency power amplifier of raising the efficiency and improve tonequality many pieces of reports are arranged on the Chinese patent communique, just do not have electric capacity audio-frequency power amplifier aspect and do not see that report is arranged.
The shortcoming that the purpose of this utility model is to overcome above-mentioned existence provides and a kind ofly can make whole audio zone must be able to balanced the amplification, improve circuit stability, improve the complete machine operating voltage simultaneously, dwindle machine volume, it is little to have power consumption, good stability, the high-quality amplifier that voltage range is wide, power output is big, the little frequency response of distortion is wide.
The purpose of this utility model is achieved in that this power amplifier is made up of constant-current source difference channel and complementary symmetrical expression push-pull output circuit.The constant-current source difference channel is made up of three groups of constant-current sources.Be connected in series successively by diode D1, D2, resistance R 18 and diode D3, D4 and constitute two groups of constant pressure sources, the A point is a positive power source terminal, and the B point is a negative power end.First constant-current source is made of G 3 and emitter resistance R5 thereof, and its base stage connects negative power end B point; Second constant-current source is made of G8 and emitter resistance R8 thereof, and its base stage connects negative power end B point; The 3rd constant-current source is made of G4 and emitter resistance R3 thereof, and its base stage connects positive power source terminal A.G1, G2 constitute difference channel, and its emitter-base bandgap grading connects the collector electrode of the first constant-current source G3, and the collector electrode of G1 then connects the collector electrode of the 3rd constant-current source G4.The emitter resistance R4 of G5 is connected between the emitter-base bandgap grading and positive supply of G5, and its base stage and collector electrode are connected on the collector electrode of G2, makes difference channel be able to balance.The base stage of G1 connects the potentiometer centre cap by resistance R 2, makes signal input part, and the base stage of G1 connects feedback resistance R17 and R6 dividing potential drop respectively, and through R6 ground connection.The symmetrical expression complementary push-pull power output circuit of this power amplifier is OCL circuit commonly used, its base stage by middle amplifying stage G6 is connected between the collector electrode of G1 and G4 in the constant-current source difference channel, and connects the base stage of the G8 of constant-current source difference channel by the emitter of stable pipe G7.This circuit all adopts crystal diode, transistor, three kinds of original papers of resistance, no electric capacity setting from input up to power output end load.For guaranteeing the stability of circuit, this circuit input stage adopts the constant-current source difference channel, the negative input end of difference engine joins with resistance and place, cancelled traditional capacitance ground connection, ground is gone in the big loop of collector junction power supply of negative input end, thereby guaranteed dynamic range, improved the ability of picking up small and weak signal, and created condition for dual input becomes single-ended output.
The bias current of positive input terminal is held with taking from, has guaranteed the stability of circuit and noiseless when static.Its output is done load with constant-current source, has further improved circuit stability, and has reduced the loss of signal, has guaranteed the amplifying power of small and weak signal.Intergrade still adopts constant voltage mode feed driving stage and output stage, drives and output stage employing complementary push-pull circuit, thereby has guaranteed the power and the load-carrying ability of device.For further improving the stability of circuit, output still feeds back to negative input end with electric resistance partial pressure, has reached the purpose of circuit self-stabilization.
This circuit constitutes the bridge circuit (see figure 2) by the mid point (promptly holding) of amplifier out and negative and positive dual power to load, during the positive half cycle of signal, power positive end acts on load by G1, during the signal negative half period, power supply negative terminal acts on load through G8, as long as power is enough, the positive-negative half-cycle of electric bridge will be flat permanent, symmetrical.
The characteristics of this circuit are no electric capacity, except that this circuit, all audio powers amplify all respectively at input, it is (see figure 3) between potentiometer centre cap and the R1, being connected in series a capacitor between R2 lower end and the ground, be the stability that exempting from of being makes the direct current input and guarantee circuit, but they all has a lot of deficiencies, so the utility model has removed electric capacity, reached better effect.
The utility model and existing amplifier relatively have following advantage:
This circuit input stage adopts the constant-current source difference channel, the negative input end of difference engine joins with resistance and place, cancelled traditional capacitance ground connection, the collector junction of negative input end is gone into ground through the big loop of power supply, thereby guaranteed dynamic range, improved the ability of picking up small and weak signal, and, dual input created condition for becoming single-ended output, the bias current of positive input terminal is held with taking from, circuit and stability and noiseless when static have been guaranteed, its output is done load with constant-current source, circuit and stability have further been improved, and reduced the loss of signal, guaranteed the amplifying power of small and weak signal, intergrade adopts constant-current source to do load, mid point adopts constant voltage mode feed driving stage and output stage, driving and output stage adopt complementary push-pull circuit, the positive-negative half-cycle of amplifying signal is very symmetrical, thereby the power and the load-carrying ability of device have been guaranteed, output feeds back to negative input end with electric resistance partial pressure, reached the certainly steady purpose of circuit, owing to save electric capacity, therefore saved again again because of the caused adverse effect of electric capacity.Advantages such as therefore, this novelly has good stability, voltage range is wide, power consumption is little, power output is big, carrying load ability is strong, distortion is little, frequency response is wide, original paper is few, the volume glitch is few.
Bottom is described further utility model embodiment in conjunction with the accompanying drawings:
Fig. 1, the utility model embodiment circuit diagram.
The bridge circuit figure that the mid point of Fig. 2, amplifier out and negative and positive dual power constitutes load.
The logic diagram of Fig. 3, existing amplifier.
Most preferred embodiment of the present utility model: referring to Fig. 1, this audio-frequency power amplifier is formed no electric capacity setting by original papers such as crystal diode, crystal trisome pipe, resistance.Entire circuit is recommended power output circuit by constant-current source difference channel and complementary symmetrical expression and is formed.The constant-current source difference channel is made up of three groups of constant-current sources.Be connected in series successively by diode D1, D2, resistance R 18 and diode D3, D4 and constitute two groups of constant pressure sources, the A point is that positive power source terminal, B point are negative power end, and like this, no matter supply voltage raises or reduction, A point and positive supply, B point and negative supply potential difference are all the time in setting range.First constant-current source is made of G3 and emitter resistance R5 thereof, and its base stage connects negative power end B point; Second constant-current source is made of G8 and emitter resistance R8 thereof, and its base stage connects negative power end B point; The 3rd constant-current source is made of G4 and basic emitter resistance R3, and its base stage connects positive power source terminal A point.G1, G2 constitute difference channel, and its emitter-base bandgap grading connects the first constant-current source G3 collector electrode, and G3 provides a constant bias current for the difference channel of G1 and G2 formation, and its electric current is by formula IC=(V
B-V
BE)/Re draws.The collector electrode of G4 connects the collector electrode of G1, is the load of G1; The emitter resistance R4 of G5 is connected between the emitter-base bandgap grading and positive supply of G5, and its base stage and collector electrode are connected on the collector electrode of G2, makes difference channel be able to symmetrical balance.The base stage of G1 connects the potentiometer centre cap by resistance R 2, makes signal input part, and the base stage of G2 is passed through feedback resistance R17 and R6 dividing potential drop, and through R6 ground connection.Symmetrical expression complementary push-pull power output circuit is OCL circuit commonly used, its base stage by middle amplifying stage G6 is connected between the collector electrode of the G1 of constant-current source difference channel and G4, and the base stage that connects the G8 of constant-current source difference channel by the emitter of stable pipe G7, the C point is a circuit output end, through load R
LJoin with ground.
Its course of work is: signal by potentiometer through the base stage of R2, after G1 amplifies, by the feed base stage of G6 of the collector electrode of G1 to G1; After G6 amplifies, by the output of G6 collector electrode, the base stage of feed simultaneously G9 and G10, after being amplified by G9, G10 respectively, from feed the respectively base stage of G11, G12 of the collector electrode of G9, G10, after being amplified by G11, G12, load R feeds again
L, finish signal output.
By above circuit design, the voltage that each point voltage, particularly circuit output end C of three groups of constant-current source control difference circuits ordered.This circuit can pass through the size of the emitter resistance R3 of adjustment second constant-current source, makes approaching zero volt of voltage between C point and the ground, thereby circuit is achieved.
Fig. 2 is that the mid point (promptly holding) of amplifier out and negative and positive dual power constitutes bridge circuit to load, and during the positive half cycle of signal, power positive end passes through G
AAct on load, during the signal negative half period, power supply negative terminal is through G
BAct on load, as long as power is enough, the positive-negative half-cycle of electric bridge will be flat permanent, symmetrical.
Fig. 3 is the logic diagram of existing amplifier, and existing audio-frequency power amplifier is all respectively at input, promptly between potentiometer centre cap and the R1, be connected in series a capacitor between R2 lower end and the ground, in order that the stability of exempting to make the direct current input and guaranteeing circuit is because the existence of capacitor has a lot of deficiencies.Therefore, the utility model improves in logic Fig. 3's, has removed electric capacity, is the key point of this power amplifier, thereby produces a desired effect.
Claims (1)
1. no electric capacity audio-frequency power amplifier, constant-current source difference channel that is made of crystal diode, transistor, three kinds of original papers of resistance and complementary symmetrical expression are recommended power output circuit and are formed, and it is characterized in that:
A. the constant-current source difference channel is made up of three groups of constant-current sources, and diode D1, D2, resistance R 18 and diode D3, D4 are connected in series successively and constitute two groups of constant pressure sources, and the A point is a positive power source terminal, and the B point is a negative power end; G3 and emitter resistance R5 thereof constitute first constant-current source, and its base stage connects negative power end B point; G8 and emitter resistance R8 thereof constitute second constant-current source, and its base stage connects negative power end B point; G4 and emitter resistance R3 thereof constitute the 3rd constant-current source, and its base stage connects positive power source terminal A point; G1, G2 constitute difference channel, and its emitter-base bandgap grading connects the collector electrode of the first constant-current source G3, and the collector electrode of G1 connects the collector electrode of the 3rd constant-current source; The emitter resistance R4 of G5 is connected between the emitter-base bandgap grading and positive supply of G5, and its base stage and collector electrode are connected on the collector electrode of G2, makes difference channel be able to symmetrical balance; The base stage of G1 connects the potentiometer centre cap by resistance R 2, makes input; The base stage of G2 connects feedback resistance R17 and R6 dividing potential drop respectively, and through R6 ground connection;
B. symmetrical expression complementary push-pull power output circuit is OCL circuit commonly used, its base stage by middle amplifying stage G6 is connected between the collector electrode of the G1 of constant-current source difference channel and G4, and connects the base stage of the G8 of constant-current source difference channel by the emitter of stable pipe G7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95242552 CN2257105Y (en) | 1995-12-18 | 1995-12-18 | Voice frequency power amplifier without capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95242552 CN2257105Y (en) | 1995-12-18 | 1995-12-18 | Voice frequency power amplifier without capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2257105Y true CN2257105Y (en) | 1997-06-25 |
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ID=33883481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95242552 Expired - Fee Related CN2257105Y (en) | 1995-12-18 | 1995-12-18 | Voice frequency power amplifier without capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2257105Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664596A (en) * | 2012-05-08 | 2012-09-12 | 侯德亮 | High fidelity transistor audio power amplifying device |
| CN104936095A (en) * | 2014-11-19 | 2015-09-23 | 成都冠深科技有限公司 | Audio processing system based on triode common-emitter symmetric amplification circuit |
| CN109100551A (en) * | 2017-06-21 | 2018-12-28 | 国网江苏省电力公司常州供电公司 | The high-precision power amplifier of test device for relay protection |
| CN109218916A (en) * | 2018-09-12 | 2019-01-15 | 上海悦骑智能科技有限公司 | Loudspeaker driving circuit |
| CN109495080A (en) * | 2017-09-12 | 2019-03-19 | 施少俊 | Conduction-switching type full bridge power amplifying circuit |
| CN113708730A (en) * | 2021-08-05 | 2021-11-26 | 东莞凯韵科技有限公司 | Moving coil phonograph head amplifying circuit |
-
1995
- 1995-12-18 CN CN 95242552 patent/CN2257105Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664596A (en) * | 2012-05-08 | 2012-09-12 | 侯德亮 | High fidelity transistor audio power amplifying device |
| CN104936095A (en) * | 2014-11-19 | 2015-09-23 | 成都冠深科技有限公司 | Audio processing system based on triode common-emitter symmetric amplification circuit |
| CN109100551A (en) * | 2017-06-21 | 2018-12-28 | 国网江苏省电力公司常州供电公司 | The high-precision power amplifier of test device for relay protection |
| CN109100551B (en) * | 2017-06-21 | 2023-08-11 | 国网江苏省电力公司常州供电公司 | High-precision power amplifier of relay protection testing device |
| CN109495080A (en) * | 2017-09-12 | 2019-03-19 | 施少俊 | Conduction-switching type full bridge power amplifying circuit |
| CN109495080B (en) * | 2017-09-12 | 2024-05-07 | 施少俊 | Full-bridge power amplifying circuit with changing guide |
| CN109218916A (en) * | 2018-09-12 | 2019-01-15 | 上海悦骑智能科技有限公司 | Loudspeaker driving circuit |
| CN113708730A (en) * | 2021-08-05 | 2021-11-26 | 东莞凯韵科技有限公司 | Moving coil phonograph head amplifying circuit |
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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 |