CN206962785U - One kind is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus - Google Patents
One kind is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus Download PDFInfo
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- CN206962785U CN206962785U CN201720416069.1U CN201720416069U CN206962785U CN 206962785 U CN206962785 U CN 206962785U CN 201720416069 U CN201720416069 U CN 201720416069U CN 206962785 U CN206962785 U CN 206962785U
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Abstract
The utility model discloses one kind to be concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus, including input amplification module, the audio signal for input to be inputted are amplified；Voltage amplification module, it is connected with input amplification module, and voltage amplification is carried out to the signal of input amplification module output；Amplification module is exported, is connected with voltage amplification module, and power amplification is carried out to the signal of voltage amplification module output；Current feedback module, it is connected with output amplification module, and the audio signal of feedback is transferred to input amplification module；First constant-current source and the second constant-current source.The utility model uses current feedback form, optimizes the circuit structure of modules, it is not necessary to protects stable adjunct circuit；Have the advantages that simple in construction, cost is cheap, making is easy, safe and efficient, tonequality is graceful.
Description
Technical field
It the utility model is related to electronic technology field, and in particular to be concisely and efficiently Class A high-fidelity transistor sound to one kind
Frequency power amplifier device.
Background technology
At present, known audio power amplifying apparatus, applied in power amplifier, there is crystal by being divided using material
Pipe and the major class of electron tube two；There are two kinds of discrete component and integrated circuit by structure division；There is simulation by circuit working state division
With numeral two kinds.No matter some insoluble intrinsic problems and defect at present all be present in which kind of audio power amplifying apparatus,
Circuit performance respectively has advantage and disadvantage, the cost of the amplifirer for causing to make using the audio power amplifying apparatus, reliability, efficiency,
Performance and acoustical quality etc. can not allow high-end demander to receive.
The caloric value of traditional class-A audio power amplifying device is big, and efficiency is low, and power output is typically small, cost compared with
Height, stability, reliability, security is poor, and only a small number of power amplifiers use this circuit.Class B audio power amplifying apparatus
Signal intermodulation distortion is very big, and sense of hearing is very poor, and the detail section of sound can not show, and general power amplifier does not use this circuit
Form.Digital audio power amplifying device, because transistor is all operated on off state, thus switch distortion is that it intrinsic is lacked
Point, high frequency response is poor, and be far from being high-fidelity.
The transistor audio power amplifying apparatus of integrated circuit, there is a problem in that：Due to small volume, element is intensive,
This is interfered greatly between just determining the high low signal of audio signal, and stability is poor, easily produces self-oscillation, meeting when serious
Burn circuit；During high power work, all elements are all operated in the condition of high temperature, and amplification performance is deteriorated；Circuit is fixed, it is difficult to is changed
Dress；Power output is typically small, can not in most cases meet to require；Also some with transistor power amplifier are common for sound effect
Same shortcoming.
There is also following problem for electron tube audio power amplifying apparatus：Volume is big；Power consumption is more, and efficiency is low；Cost is high；Life-span
It is short；Maintenance cost is high；Power output is small；The presence of output transformer determines that the audio distortions of low frequency and high frequency are big, linear poor
And cause sense of hearing bad.
The power amplifier that existing audio power amplifying apparatus makes more than using at present, transistor power amplifier is in sound
Common drawback in matter is：Sound number taste is denseer, lacks mellow sense and sweet sense, odd harmonic distortion is big, and high pitch has very strong
Burr sense, allow people to be difficult to endure under big volume for a long time；Space multistory effect is poor；Efficiency and acoustical quality can not be taken into account；First
Class B, Class B intermodulation distortion are big, and sound details is few, or even details is submerged completely；Transient intermodulation is big, the definition of sound
Poor with stereovision, dynamic range is small.And electronic tube power amplifier body product is big, power consumption is more, and efficiency is low, and cost is high, short life, safeguards
Costly, power output is small, and bass and high pitch sense of hearing are bad.
With the horizontal raising of people's material and culture, also more and more higher, existing audio are required to the tonequality of stereo set
Power amplifier device, more music-lovers far can not be met and had the fanatic and harsh sound equipment pursued to tonequality
The needs of fan.And circuit is complicated, the high audio power amplifying apparatus of price again can not be by the people of vast wage-earners
Received, therefore in the market is badly in need of one kind can have that simple in construction, cost is cheap, making is easy, safe and efficient, sound simultaneously
The HD Audio power amplifier device of the advantages that of fine quality U.S..
More important point is：Current most of audio-frequency power amplifiers are all the circuit shapes using Voltage Feedback
Formula, its acoustical quality is much worse than current feedback circuit form.Because estimated current feedback has technical bottleneck, so being difficult to push away
Wide and realization, even if there is a small amount of application, also all it is to employ some to protect stabilization technique measures, so brings again many attached
Add distortion, thus lose more than gain, make its effect have a greatly reduced quality.The transient state intermodulation that current feedback can greatly reduce power amplification device is lost
Very, the mellow nature of sound.
Utility model content
The purpose of this utility model is to provide one kind and is concisely and efficiently Class A high-fidelity transistor Audio power amplifier dress
Put.
For the above-mentioned purpose, one kind is provided in one embodiment of the present utility model and is concisely and efficiently Class A high-fidelity crystalline substance
Body pipe audio power amplifying apparatus, it is characterised in that including：
Amplification module is inputted, the audio signal for input to be inputted is amplified；
Voltage amplification module, it is connected with input amplification module, and the signal progress voltage of input amplification module output is put
Greatly；
Amplification module is exported, is connected with voltage amplification module, and the signal progress power of voltage amplification module output is put
Greatly；
Current feedback module, it is connected with output amplification module, and the audio signal of feedback is transferred to input amplification module；
First constant-current source, for providing supply voltage for input amplification module；
Second constant-current source, for providing supply voltage for voltage amplification module；
Input amplification module includes：
The electric capacity C1 being series between audio signal input end and resistance R2；
The resistance R1 being parallel between electric capacity C1 and resistance R2 and ground；
The resistance R2 being connected between resistance R1 and electric capacity C2；
The electric capacity C2 being parallel between resistance R2 and ground；
The NPN type triode Q1 that emitter stage is connected with PNP type triode Q6 colelctor electrodes；
The resistance R7 being series between PNP type triode Q1 colelctor electrodes and negative supply.
Preferably, voltage amplification module includes：
Base stage is connected to PNP type triode Q1 colelctor electrodes and the NPN type triode Q2 on resistance R7；
The electric capacity C6 being parallel between NPN type triode Q2 colelctor electrode and base stage；
The resistance R8 being connected between NPN type triode Q2 emitter stages and negative supply.
Preferably, output amplification module includes：
It is series at positive supply and exports the NPN type triode Q7 and resistance R9 between amplification module output end；
It is series at positive supply and exports the NPN type triode Q9 and resistance R13 between amplification module output end；
The NPN type triode Q8 and resistance R10 being series between output amplification module output end and negative supply；
The NPN type triode Q10 and resistance R14 being series between output amplification module output end and negative supply；
It is connected to the resistance R11 of NPN type triode Q7 colelctor electrodes and NPN type triode Q9 base stages；
It is connected to the resistance R12 of NPN type triode Q8 emitter stages and NPN type triode Q10 base stages；
The resistance R15 and electric capacity C7 being series between output amplification module output end and ground；
The inductance L and resistance R16 being parallel between output amplification module output end and load.
Preferably, current feedback module includes：
The resistance R5 being connected on resistance R9 and resistance R13；
It is connected in parallel on the electric capacity C5 at resistance R5 both ends；
It is connected to the resistance R6 of resistance R5 one end；
The electric capacity C3 and C4 being connected between resistance R6 one end and ground.
Preferably, the first constant-current source includes：
The PNP type triode Q6 that colelctor electrode is connected with PNP type triode Q1 emitter stages；
Emitter stage is connected to positive supply, base stage is connected to the PNP type triode Q3 of PNP type triode Q6 emitter stages；
The resistance R3 being parallel between PNP type triode Q6 base stages and ground；
The adjustable resistance VR1 being series between PNP type triode Q6 emitter stages and positive supply.
Preferably, the second constant-current source includes：
The PNP type triode Q5 that colelctor electrode is connected with NPN type triode Q2 colelctor electrodes；
Emitter stage is connected to positive supply, base stage is connected to the PNP type triode Q4 of PNP type triode Q5 emitter stages；
The resistance R4 being parallel between PNP type triode Q5 base stages and ground；
The adjustable resistance VR2 being series between PNP type triode Q5 emitter stages and positive supply.
In summary, the utility model has advantages below：
The utility model uses current feedback form, optimizes the circuit structure of modules, it is not necessary to protects stable additional
Circuit；Have the advantages that simple in construction, cost is cheap, making is easy, safe and efficient, tonequality is graceful.
This transistor audio power amplifying apparatus of the present utility model, each amplifying stage are all operated in Class A magnifying state.
Circuit is simple, element is common, cost is cheap, can also obtain good sound effect even if using common components, uses high-quality member
It is then better during part.Manufacture easily, adjustable resistance VR1 is used to adjust mid-point voltage, and adjustable resistance VR2 is used to adjust electricity
Press the quiescent bias current of amplifying stage and power-amplifier stage.Debugging is simple, and power output pipe only needs simply pairing to meet will
Ask, be particularly suitable for batch production large-scale production, if it is desired to increase power output, only need to improve supply voltage, or use instead bigger
The power output tube of power output, or by the way of multipair power tube is in parallel.Efficiency high, caloric value is low, power supply profit
High with rate, reliability is high.Acoustical quality shows unique characteristics, and has high-power, the fast speed of transistor power amplifier, the spy that wideband rings concurrently
Point.There is mellow, sweet, the submissive tonequality feature of electronic tube power amplifier again, acoustical quality surmounts now comprehensively with power output
World high-fidelity power amplifier integrated circuit LM3886, TDA7293 and electronic tube power amplifier etc..Before wide market application
Scape, it can be widely used in the power amplifiers such as high-fidelity family expenses, automobile, computer, stage.
Brief description of the drawings
Fig. 1 is the schematic diagram of the utility model one embodiment；
Fig. 2 is the circuit diagram of the utility model one embodiment.
Embodiment
With reference to figure 1, the utility model provides one kind and is concisely and efficiently Class A high-fidelity transistor Audio power amplifier dress
Put, including input amplification module, the audio signal for input to be inputted are amplified；Voltage amplification module, puts with input
Big module connection, and voltage amplification is carried out to the signal of input amplification module output；Amplification module is exported, with voltage amplification module
Connection, and power amplification is carried out to the signal of voltage amplification module output；Current feedback module, it is connected with output amplification module,
And the audio signal of feedback is transferred to input amplification module；First constant-current source, for providing power supply electricity for input amplification module
Pressure；Second constant-current source, for providing supply voltage for voltage amplification module.
For circuit principle structure of the present utility model with reference to shown in figure 2, the type selectings of each electric elements of the utility model can be with
Selected with reference to lower column signal and parameter.
The symbol and parameter of resistance include：
The symbol and parameter of electric capacity include：
C1--4.7μF/50V；C2--330pF/63V；C3--220uF/50V；
C4--0.01μF/63V；C5~C6--22pF/100V；C7--0.1μF/100V.
The symbol and parameter of triode include：
Q1, Q3, Q4, Q5, Q6--A1013 (PNP type triode)；
Q2--C2383 (NPN type triode)；
Q7, Q8--C2073 (NPN type triode)；
Q9, Q10--2SC5200 (NPN type triode)
Inductance：Diameter 1mm enamel-covered wires are on diameter 6mm cylinder around 13 circles.
Wherein influence of the value size of main element parameter to circuit：
1st, R3 and R4 value should be adjusted according to the height of the supply voltage of power supply, should be increased when supply voltage is high
Resistance value, be essentially the current value for ensureing to flow through R3 be 1mA, the current value that flows through R4 be 4mA or so.
2nd, promoting level triode quiescent current to be arranged to 5mA or so is advisable.
Input amplification module of the present utility model includes：
The electric capacity C1 being series between audio signal input end and resistance R2；
The resistance R1 being parallel between electric capacity C1 and resistance R2 and ground；
The resistance R2 being connected between resistance R1 and electric capacity C2；
The electric capacity C2 being parallel between resistance R2 and ground；
The NPN type triode Q1 that emitter stage is connected with PNP type triode Q6 colelctor electrodes；
The resistance R7 being series between PNP type triode Q1 colelctor electrodes and negative supply.
Wherein, voltage amplification module includes：
Base stage is connected to PNP type triode Q1 colelctor electrodes and the NPN type triode Q2 on resistance R7；
The electric capacity C6 being parallel between NPN type triode Q2 colelctor electrode and base stage；
The resistance R8 being connected between NPN type triode Q2 emitter stages and negative supply.
Wherein, output amplification module includes：
It is series at positive supply and exports the NPN type triode Q7 and resistance R9 between amplification module output end；
It is series at positive supply and exports the NPN type triode Q9 and resistance R13 between amplification module output end；
The NPN type triode Q8 and resistance R10 being series between output amplification module output end and negative supply；
The NPN type triode Q10 and resistance R14 being series between output amplification module output end and negative supply；
It is connected to the resistance R11 of NPN type triode Q7 colelctor electrodes and NPN type triode Q9 base stages；
It is connected to the resistance R12 of NPN type triode Q8 emitter stages and NPN type triode Q10 base stages；
The resistance R15 and electric capacity C7 being series between output amplification module output end and ground；
The inductance L and resistance R16 being parallel between output amplification module output end and load.
Wherein, current feedback module includes：
The resistance R5 being connected on resistance R9 and resistance R13；
It is connected in parallel on the electric capacity C5 at resistance R5 both ends；
It is connected to the resistance R6 of resistance R5 one end；
The electric capacity C3 and C4 being connected between resistance R6 one end and ground.
Wherein, the first constant-current source includes：
The PNP type triode Q6 that colelctor electrode is connected with PNP type triode Q1 emitter stages；
Emitter stage is connected to positive supply, base stage is connected to the PNP type triode Q3 of PNP type triode Q6 emitter stages；
The resistance R3 being parallel between PNP type triode Q6 base stages and ground；
The adjustable resistance VR1 being series between PNP type triode Q6 emitter stages and positive supply.
Wherein, the second constant-current source includes：
The PNP type triode Q5 that colelctor electrode is connected with NPN type triode Q2 colelctor electrodes；
Emitter stage is connected to positive supply, base stage is connected to the PNP type triode Q4 of PNP type triode Q5 emitter stages；
The resistance R4 being parallel between PNP type triode Q5 base stages and ground；
The adjustable resistance VR2 being series between PNP type triode Q5 emitter stages and positive supply.
The utility model device is asymmetric circuit, and key is the circuit structure that amplifying circuits at different levels are taken the course of its own, defeated
Enter amplification and voltage amplification is all only completed with a transistor, this requires it to must operate at Class A magnifying state.
More important point is that, when Larger Dynamic works, mid-point voltage is sufficiently stable, and this is that existing similar circuit can not accomplish.
The circuit being made up of Q7, Q8 and Q9, Q10 is also all operated in Class A state, and two parts work simultaneously, and triode is not deposited at work
In cut-off state, this point is different from other power amplifiers, and upper and lower two parts are similar to BTL symmetrical operation modes.Whole device
The graceful acoustics of tonequality can be reached.
The current feedback form of big loop, and need not have a strong impact on that the DC servo circuit of tonequality is electric to stablize midpoint
Pressure, caused counter electromotive force when can be efficiently against speaker operation, it can significantly reduce transient state caused by circuit work
Intermodulation distortion, that is to say, that caused counter electromotive force is positive and negative in the form of electric current during speaker operation is fed to input stage, so as to
Counteract the influence that counter electromotive force works input signal and circuit.Even-order harmonic is enriched simultaneously, can produce and be similar to electron tube
The Larger Dynamic of power amplifier, mellow, sweet sound effect.
C5, C6 are anti-high-frequency self-excitation electric capacity, and capacity is very small, will not produce phase shift, thus do not have any influence on tonequality.
The effect of constant current source module one is to provide stable positive voltage for input amplification grade circuit.The effect of constant current source module two is
For the positive voltage of voltage amplifier stage circuit with stable.
Although being described in detail with reference to accompanying drawing to specific embodiment of the present utility model, should not be construed as pair
The restriction of the protection domain of this patent.In the scope described by claims, those skilled in the art are without creative labor
The dynamic various modification and variation that can be made still belong to the protection domain of this patent.
Claims (6)
1. one kind is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus, it is characterised in that including：
Amplification module is inputted, the audio signal for input to be inputted is amplified；
Voltage amplification module, it is connected with the input amplification module, and the signal progress voltage of input amplification module output is put
Greatly；
Amplification module is exported, is connected with the voltage amplification module, and the signal progress power of voltage amplification module output is put
Greatly；
Current feedback module, it is connected with the output amplification module, and the audio signal of feedback is transferred to input amplification module；
First constant-current source, for providing supply voltage for the input amplification module；
Second constant-current source, for providing supply voltage for the voltage amplification module；
The input amplification module includes：
The electric capacity C1 being series between audio signal input end and resistance R2；
The resistance R1 being parallel between electric capacity C1 and resistance R2 and ground；
The resistance R2 being connected between resistance R1 and electric capacity C2；
The electric capacity C2 being parallel between resistance R2 and ground；
The NPN type triode Q1 that emitter stage is connected with PNP type triode Q6 colelctor electrodes；
The resistance R7 being series between PNP type triode Q1 colelctor electrodes and negative supply.
2. it is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus as claimed in claim 1, it is characterised in that
The voltage amplification module includes：
Base stage is connected to PNP type triode Q1 colelctor electrodes and the NPN type triode Q2 on resistance R7；
The electric capacity C6 being parallel between NPN type triode Q2 colelctor electrode and base stage；
The resistance R8 being connected between NPN type triode Q2 emitter stages and negative supply.
3. it is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus as claimed in claim 1, it is characterised in that
The output amplification module includes：
It is series at positive supply and exports the NPN type triode Q7 and resistance R9 between amplification module output end；
It is series at positive supply and exports the NPN type triode Q9 and resistance R13 between amplification module output end；
The NPN type triode Q8 and resistance R10 being series between output amplification module output end and negative supply；
The NPN type triode Q10 and resistance R14 being series between output amplification module output end and negative supply；
It is connected to the resistance R11 of NPN type triode Q7 colelctor electrodes and NPN type triode Q9 base stages；
It is connected to the resistance R12 of NPN type triode Q8 emitter stages and NPN type triode Q10 base stages；
The resistance R15 and electric capacity C7 being series between output amplification module output end and ground；
The inductance L and resistance R16 being parallel between output amplification module output end and load.
4. it is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus as claimed in claim 1, it is characterised in that
The current feedback module includes：
The resistance R5 being connected on resistance R9 and resistance R13；
It is connected in parallel on the electric capacity C5 at resistance R5 both ends；
It is connected to the resistance R6 of resistance R5 one end；
The electric capacity C3 and C4 being connected between resistance R6 one end and ground.
5. it is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus as claimed in claim 1, it is characterised in that
First constant-current source includes：
The PNP type triode Q6 that colelctor electrode is connected with PNP type triode Q1 emitter stages；
Emitter stage is connected to positive supply, base stage is connected to the PNP type triode Q3 of PNP type triode Q6 emitter stages；
The resistance R3 being parallel between PNP type triode Q6 base stages and ground；
The adjustable resistance VR1 being series between PNP type triode Q6 emitter stages and positive supply.
6. it is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus as claimed in claim 1, it is characterised in that
Second constant-current source includes：
The PNP type triode Q5 that colelctor electrode is connected with NPN type triode Q2 colelctor electrodes；
Emitter stage is connected to positive supply, base stage is connected to the PNP type triode Q4 of PNP type triode Q5 emitter stages；
The resistance R4 being parallel between PNP type triode Q5 base stages and ground；
The adjustable resistance VR2 being series between PNP type triode Q5 emitter stages and positive supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720416069.1U CN206962785U (en) | 2017-04-20 | 2017-04-20 | One kind is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720416069.1U CN206962785U (en) | 2017-04-20 | 2017-04-20 | One kind is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206962785U true CN206962785U (en) | 2018-02-02 |
Family
ID=61373497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720416069.1U Expired - Fee Related CN206962785U (en) | 2017-04-20 | 2017-04-20 | One kind is concisely and efficiently Class A high-fidelity transistor audio power amplifying apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206962785U (en) |
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2017
- 2017-04-20 CN CN201720416069.1U patent/CN206962785U/en not_active Expired - Fee Related
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