CN207504827U - A kind of super class A bias circuit - Google Patents
A kind of super class A bias circuit Download PDFInfo
- Publication number
- CN207504827U CN207504827U CN201721714095.9U CN201721714095U CN207504827U CN 207504827 U CN207504827 U CN 207504827U CN 201721714095 U CN201721714095 U CN 201721714095U CN 207504827 U CN207504827 U CN 207504827U
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- emitter
- output
- power tube
- diode
- power amplifier
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Abstract
The utility model discloses a kind of super class A bias circuits,It is related to audio-frequency power amplifier technical field,For prior art circuits complexity,It debugs numerous and diverse,The technical problems such as effect is undesirable,The first biasing diode is in series with using between the emitter and the first output resistance of the first output power tube,The second biasing diode is in series between the emitter and the second output resistance of second output power tube,The emitter of first output power tube is with the emitter of the second output power tube in a manner that biasing resistor is connect,The utility model only needs slightly modified on the basis of existing amplifier,Its output stage quiescent current is very stable,Do not change therefore to export with output current and stablize,The switching characteristic of circuit becomes more preferable,And do not influence other performances of primary circuit,The circuit structure is simple,Stability is good,It is at low cost,Effect is good,Debugging is easy,It is easy to make,The characteristics of suitable for mass production.
Description
Technical field
The utility model is related to audio-frequency power amplifier technical field, more particularly to a kind of super class A bias circuit.
Background technology
Class A amplifier good linearity, the distortion factor is minimum, and sound is mellow sweet, and stereovision is good, is generally liked by everybody, but
Its efficiency is low, power consumption is big, calorific value is high, radiator volume is big, of high cost people is allowed to hang back；Class B efficiency of amplitude is high, hair
Heat is low, but there is very big intermodulation distortion and switch distortions.Existing each power-like amplifier, is mostly amplified with class AB
Based on device, the output stage of amplifier sets a smaller quiescent current, makes to be in Class A, relatively high power during amplifier small-power
When work in Class B, to reduce intermodulation distortion and switch distortion, but its switch distortion is always difficult to avoid that, attached in signal zero-crossing
Closely, output stage transistor is converted between two states are switched off and on, and efferent duct is close to there are one when cut-off and just conducting
Section nonlinear area, chief and vice half-wave are unable to linear transitions and generate distortion, and low electricity can only be also reduced using the class AB of high bias current
The distortion of ordinary mail number, and cannot prevent to be distorted.
Theoretically, super Class A biasing is the most effectual way for solving this kind of distortion, it can make output stage, and two-arm is defeated up and down
Whenever outlet pipe does not end, so as to prevent switch distortion and intermodulation distortion.Super class A amplifier sound quality and class A amplifier
Closest, and efficiency is higher, when small-signal, is low in energy consumption, radiator it is small.
Popular super class A amplifier currently on the market, not only circuit is complicated, and debugging is more numerous and diverse, and actual effect is simultaneously paid no attention to
Think, and equiva lent impedance is small mostly, causing the overload of prime deteriorates its performance, from efferent duct emitter resistance voltage sampling
Person is then vulnerable to seriously affecting for inductive load loud speaker, and regulation and control action error is big or even disorderly, reduces working performance.
Invention content
The utility model provides a kind of super class A bias circuit, to solve super Class A amplification popular currently on the market
Device, not only circuit is complicated, and debugging is more numerous and diverse, and actual effect is unsatisfactory, and equiva lent impedance is small mostly, causes the load of prime
It is overweight to deteriorate its performance, then it is vulnerable to the serious shadow of inductive load loud speaker from efferent duct emitter resistance voltage sampling person
It rings, regulation and control action error is big or even disorderly, the technical issues of reducing working performance.
It is realized to solve the above problems, the utility model adopts the following technical solution：
A kind of super class A bias circuit pushes grade and power amplifier output stage, power amplifier output stage including power amplifier
The first biasing diode is in series between the emitter and the first output resistance of first output power tube；
Power amplifier output stage second exports and is in series with the second biasing between the emitter and the second output resistance of power tube
Diode；
Power amplifier output stage first exports the emitter of power tube and power amplifier output stage second exports power tube
Emitter is connected by biasing resistor.
Preferably, the first biasing diode and the second biasing diode are fast recovery diode or Ultrafast recovery two
Pole pipe.
Preferably, power amplifier pushes and is additionally provided with output stage constant pressure biasing circuit before grade.
Preferably, the first output power tube and the second output power tube are triode or Darlington transistor.
The utility model only needs slightly modified on the basis of existing amplifier, and output stage quiescent current is very steady
It is fixed, do not change therefore to export with output current and stablize, the switching characteristic of circuit becomes more preferable, and does not influence other property of primary circuit
Can, which can be used in transistor power amplifier, can overcome the switch distortion of Class B and class AB and intermodulation distortion and have
There is the characteristics of circuit structure is simple, and stability is good, at low cost, and effect is good, debugging is easy, is easy to make, suitable for mass production.
Description of the drawings
Fig. 1 is the circuit common structure diagram of existing first and second power-like amplifier output stage；
Fig. 2 is 1 electrical block diagram of embodiment provided by the utility model；
Fig. 3 is 2 electrical block diagram of embodiment provided by the utility model.
Specific embodiment
To make the purpose of this utility model, technical solution and advantage clearer, implement below in conjunction with the utility model
Fig. 1 ~ 3 in example, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described reality
It is the utility model part of the embodiment to apply example, instead of all the embodiments.Usually it is described and illustrated herein in the accompanying drawings
The detailed description of the embodiment of the utility model is not intended to limit claimed the scope of the utility model, but only table
Show the selected embodiment of the utility model.Based on the embodiment in the utility model, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Embodiment 1
Fig. 1 is the circuit common structure diagram of existing first and second power-like amplifier output stage, and the present embodiment is in the base of Fig. 1
It is improved on plinth, as shown in Fig. 2, a kind of super class A bias circuit, grade and power amplifier output stage are pushed including power amplifier,
Power amplifier output stage first exports and is in series with two pole of the first biasing between the emitter and the first output resistance Re1 of power tube V1
Pipe D1；Power amplifier output stage second, which exports, is in series with second partially between the emitter and the second output resistance Re2 of power tube V2
Put diode D2；
Power amplifier output stage first exports the emitter of power tube V1 and power amplifier output stage second exports power tube
The emitter of V2 is connected by biasing resistor Re4.
Wherein, in order to ensure the switching characteristic of circuit, the first biasing diode D1 and the second biasing diode D2 are fast
Recovery diode.In order to ensure the stability of circuit, power amplifier pushes and is additionally provided with output stage constant pressure biasing circuit before grade.
First output power tube V1 and the second output power tube V2 is triode in above-mentioned.
The emitter of above-mentioned power amplifier output power tube is connected a fast recovery diode or Ultrafast recovery two respectively
Pole pipe D1, D2 is as output channel, and connection resistance Re4 is as biased electrical between the emitter that two export power tube V1, V2
Circulation road；Resistance R1, variable resistance RP1 and triode V5 form common output stage constant pressure biasing.
When static, RP1 is adjusted, diode D1, D2 is connected and has appropriate electric current to pass through, the static state of efferent duct V1, V2
Electric current is to flow through the electric current of diode D1, D2 and flow through the sum of electric current of resistance Re4.When amplifier operation, in signal just
Half cycle, the increase of output voltage forward direction, efferent duct V1 and diode D1, resistance Re1 electric currents increase, the voltage increase on resistance Re1；
Efferent duct V2 and diode D2, resistance Re2 electric currents reduce simultaneously, and the voltage on resistance Re2 reduces；Due to being biased using constant pressure,
The voltage at resistance Re4 both ends is basically unchanged, and when output current continues to increase, the voltage on resistance Re1 continues to increase, resistance Re1
On voltage and diode D1 on the sum of voltage, in addition diode D2 forward conductions voltage is less than the voltage at resistance Re4 both ends
When, diode D2 cut-offs, efferent duct V2 emitter currents are equal to the electric current for flowing through resistance Re4, no longer with the increase of output current
And decline, it is held in the positive half cycle of entire signal.In the negative half period of signal, then diode D1 cut-offs, output are changed to
Pipe V1 emitter currents are equal to the electric current for flowing through resistance Re4.
Embodiment 2
Fig. 3 is 2 electrical block diagram of embodiment provided by the utility model, as shown in figure 3, the present embodiment is in embodiment
By the first output power tube V1 and the second output power tube V2 be Darlington transistor on the basis of 1, operation principle also with implementation
Example 1 is identical, is not repeated herein.
The utility model only needs slightly modified on the basis of existing amplifier, and output stage quiescent current is very steady
It is fixed, do not change therefore to export with output current and stablize, the switching characteristic of circuit becomes more preferable, and does not influence other property of primary circuit
Can, which can be used in transistor power amplifier, can overcome the switch distortion of Class B and class AB and intermodulation distortion and have
There is the characteristics of circuit structure is simple, and stability is good, at low cost, and effect is good, debugging is easy, is easy to make, suitable for mass production.
Claims (4)
1. a kind of super class A bias circuit pushes grade and power amplifier output stage including power amplifier, it is characterised in that：
Power amplifier output stage first exports power tube（V1）Emitter and the first output resistance（Re1）Between be in series with first
Bias diode（D1）；
Power amplifier output stage second exports power tube（V2）Emitter and the second output resistance（Re2）Between be in series with second
Bias diode（D2）；
Power amplifier output stage first exports power tube（V1）Emitter and power amplifier output stage second export power tube
（V2）Emitter pass through biasing resistor（Re4）Connection.
2. super class A bias circuit according to claim 1, it is characterised in that：
The first biasing diode（D1）With the second biasing diode（D2）It is two pole of fast recovery diode or Ultrafast recovery
Pipe.
3. super class A bias circuit according to claim 1, it is characterised in that：
Power amplifier pushes and is additionally provided with output stage constant pressure biasing circuit before grade.
4. super class A bias circuit according to claim 1, it is characterised in that：
First output power tube（V1）With the second output power tube（V2）For triode or Darlington transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721714095.9U CN207504827U (en) | 2017-12-11 | 2017-12-11 | A kind of super class A bias circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721714095.9U CN207504827U (en) | 2017-12-11 | 2017-12-11 | A kind of super class A bias circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207504827U true CN207504827U (en) | 2018-06-15 |
Family
ID=62508677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721714095.9U Expired - Fee Related CN207504827U (en) | 2017-12-11 | 2017-12-11 | A kind of super class A bias circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207504827U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023024526A1 (en) * | 2021-08-22 | 2023-03-02 | 郭桥石 | Amplification apparatus |
-
2017
- 2017-12-11 CN CN201721714095.9U patent/CN207504827U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023024526A1 (en) * | 2021-08-22 | 2023-03-02 | 郭桥石 | Amplification apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180615 Termination date: 20191211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |