CN105846786A - Power amplifier circuit superposing superaudio signal to eliminate crossover distortion - Google Patents
Power amplifier circuit superposing superaudio signal to eliminate crossover distortion Download PDFInfo
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- CN105846786A CN105846786A CN201610170810.0A CN201610170810A CN105846786A CN 105846786 A CN105846786 A CN 105846786A CN 201610170810 A CN201610170810 A CN 201610170810A CN 105846786 A CN105846786 A CN 105846786A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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Abstract
The invention discloses a power amplifier circuit superposing superaudio signals to eliminate crossover distortion; the power amplifier circuit comprises triodes VT1-VT8, resistor R1-R11, capacitors C1-C7, an inductor L1, and diodes D1-D2; the beneficial effects are that the superaudio signals can prevent crossover distortion problems caused by alternative conduction of two triodes of a push-pull power amplifier, and the timbre requirements by a conventional audio frequency power amplifier can be ensured; the novel power amplifier circuit can omit a DC bias employed by a conventional AB type power amplifier to keep a micro conduction state, thus improving whole machine efficiency, and reducing power consumption; the method can reduce DC power consumption, thus reducing the temperature of two triodes of the push-pull power amplifier under large power amplification conditions, and improving large power amplifier stability and service life; the power amplifier circuit can provide high practical value, and provides certain economic benefits and social benefits.
Description
Technical field
The invention belongs to Audio power amplifier technical field, relate to a kind of superposition superaudio signal and eliminate the power amplifier of intermodulation distortion.
Background technology
In audio frequency amplifier, the B class power amplification circuit shown in widely used Fig. 4, its two pipes take turns to operate in the positive-negative half-cycle of input signal.As known, the problem that this circuit also exists intermodulation distortion.For obtaining less distortion and higher efficiency, the general employing AB class power amplifier with quiescent biasing shown in Fig. 5.
Intermodulation distortion is the distortion at the positive and negative infall of output waveform caused due to the transistor nonlinear characteristic when small area analysis.There is static power amplifier and be biased with three obvious shortcomings: first, it is necessary to well-designed suitable biasing.If biasing deficiency, it is impossible to intermodulation distortion is completely eliminated, output voltage waveforms is made to hand over more region continuously excessively if biasing is too big, can not can increase the loss of pipe in positive-negative half-cycle.Second, quiescent biasing itself is not a fixing amount, but a variable, it can be affected by factors such as temperature to make originally to design more suitably to bias becomes improper.Such as when transistor temperature rise increases, make quiescent current increase, and the increase of quiescent current further increases the temperature of pipe, transistor finally may be caused to burn.In order to protect the transistor of power amplifier, increase and set temperature-compensating original paper and heat abstractor, make circuit become complicated.
As power amplifier, the height of delivery efficiency directly influences the radiator volume of power supply and power amplifier level.Easily there is intermodulation distortion when small-signal in AB class power amplifier, the most easily generates heat when power is big.
Summary of the invention
The technical problem to be solved be to provide a kind of can eliminate intermodulation distortion phenomenon and reduce power consumption superposition superaudio signal eliminate intermodulation distortion power amplifier.
Be the technical scheme is that a kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion by solving above-mentioned technical problem, it includes audion VT1 ~ VT8, resistance R1 ~ R11, electric capacity C1 ~ C7, inductance L1, diode D1 ~ D2, terminal A and terminal B；
Audio signal connects the emitter stage of described audion VT1 through described inductance L1；The emitter stage of described audion VT1 is through described resistance R1 ground connection；The base stage of described audion VT1 connects the emitter stage of described audion VT7 through described resistance R11；
The colelctor electrode of described audion VT1 and the base stage of audion VT6 connect described terminal A respectively；The colelctor electrode of described audion VT2 and the base stage of audion VT5 connect described terminal B respectively；
Described terminal B connects the positive pole of described diode D1；Described terminal A connects the negative pole of described diode D1；
The base stage of described audion VT7 connects the emitter stage of described audion VT5；The base stage of described audion VT8 connects the emitter stage of described audion VT6；
Described resistance R8 is connected between the emitter stage of described audion VT5 and the emitter stage of described audion VT6；
The emitter stage of described audion VT7 connects the emitter stage of audion VT8；
Described electric capacity C6 connects with electric capacity C7 and is followed by between+27V DC source and ground；
The emitter stage of described audion VT7 connects one end of sound equipment LS through described electric capacity C5；The node of described electric capacity C6 and electric capacity C7 connects the other end of sound equipment LS；
Described resistance R9 and resistance R10 connects and is followed by between base stage and the ground of described audion VT8；The node of described resistance R9 and resistance R10 connects the base stage of described audion VT1；
Described electric capacity C4 is connected between base stage and the colelctor electrode of described audion VT1；
The grounded collector of described audion VT6；The grounded collector of described audion VT8；The colelctor electrode of described audion VT5 connects+27V DC source；The colelctor electrode of described audion VT7 connects+27V DC source；
Described resistance R2 connects between emitter stage and the+27V DC source of described audion VT2；
The base stage of described audion VT2 connects the emitter stage of described audion VT3；
The colelctor electrode of described audion VT3 connects+27V DC source；The emitter stage of described audion VT3 is through described resistance R6 ground connection；
The emitter stage of described audion VT4 connects+27V DC source；The colelctor electrode of described audion VT4 is through described resistance R7 ground connection；The base stage of described audion VT4 connects the base stage of described audion VT2 successively through described resistance R3, diode D2；
Described electric capacity C3 is connected between colelctor electrode and the base stage of described audion VT4；
Described resistance R4 with R5 connects and is followed by between the base stage and the colelctor electrode of audion VT4 of described audion VT3；Described electric capacity C1 is connected between base stage and the+27V DC source of described audion VT3；Described electric capacity C2 is connected between node and the+27V DC source of described resistance R4 and R5.
The invention has the beneficial effects as follows: the intermodulation distortion problem that superaudio signal occurs when avoiding two audion alternate conduction of push-pull power amplifier；Sound equipment LS below will not be played back, thus without having influence on the requirement to tonequality of the conventional audio power amplifier after superaudio signal completes and breaks through the effect in intermodulation distortion region；Effect due to superaudio signal so that two audions of push-pull power amplifier can successfully alternate conduction thus eliminate the direct current biasing that uses to keep lightly conducting state in tradition AB class power amplifier, thus improve overall efficiency, reduce power consumption；The method provided due to the present invention reduces DC power, thus also reduces the temperature of two audions of push-pull power amplifier in the case of high-power amplification, improves stability and the service life of High-power amplifier；The present invention has higher practicality, and has certain economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the comparison diagram of 1kHz input audio frequency and A point waveform.
Fig. 3 is the comparison of wave shape figure of output audio frequency and input audio frequency.
Fig. 4 is B class power amplification circuit.
Fig. 5 is the AB class power amplifier with quiescent biasing.
Detailed description of the invention
From the embodiment shown in Fig. 1-5, it includes audion VT1 ~ VT8, resistance R1 ~ R11, electric capacity C1 ~ C7, inductance L1, diode D1 ~ D2, terminal A and terminal B；
Audio signal connects the emitter stage of described audion VT1 through described inductance L1；The emitter stage of described audion VT1 is through described resistance R1 ground connection；The base stage of described audion VT1 connects the emitter stage of described audion VT7 through described resistance R11；
The colelctor electrode of described audion VT1 and the base stage of audion VT6 connect described terminal A respectively；The colelctor electrode of described audion VT2 and the base stage of audion VT5 connect described terminal B respectively；
Described terminal B connects the positive pole of described diode D1；Described terminal A connects the negative pole of described diode D1；
The base stage of described audion VT7 connects the emitter stage of described audion VT5；The base stage of described audion VT8 connects the emitter stage of described audion VT6；
Described resistance R8 is connected between the emitter stage of described audion VT5 and the emitter stage of described audion VT6；
The emitter stage of described audion VT7 connects the emitter stage of audion VT8；
Described electric capacity C6 connects with electric capacity C7 and is followed by between+27V DC source and ground；
The emitter stage of described audion VT7 connects one end of sound equipment LS through described electric capacity C5；The node of described electric capacity C6 and electric capacity C7 connects the other end of sound equipment LS；
Described resistance R9 and resistance R10 connects and is followed by between base stage and the ground of described audion VT8；The node of described resistance R9 and resistance R10 connects the base stage of described audion VT1；
Described electric capacity C4 is connected between base stage and the colelctor electrode of described audion VT1；
The grounded collector of described audion VT6；The grounded collector of described audion VT8；The colelctor electrode of described audion VT5 connects+27V DC source；The colelctor electrode of described audion VT7 connects+27V DC source；
The emitter stage of described audion VT2 connects+27V DC source；The base stage of described audion VT2 connects the emitter stage of described audion VT3；
The colelctor electrode of described audion VT3 connects+27V DC source；The emitter stage of described audion VT3 is through described resistance R6 ground connection；
The emitter stage of described audion VT4 connects+27V DC source；The colelctor electrode of described audion VT4 is through described resistance R7 ground connection；The base stage of described audion VT4 connects the base stage of described audion VT2 successively through described resistance R3, diode D2；
Described electric capacity C3 is connected between colelctor electrode and the base stage of described audion VT4；
Described resistance R4 with R5 connects and is followed by between the base stage and the colelctor electrode of audion VT4 of described audion VT3；Described electric capacity C1 is connected between base stage and the+27V DC source of described audion VT3；Described electric capacity C2 is connected between node and the+27V DC source of described resistance R4 and R5.
The model 9014 of described audion VT1；The model 9014 of described audion VT2；The model 9014 of described audion VT3；The model 9015 of described audion VT4；The model 9014 of described audion VT5；The model 9015 of described audion VT6；The model 9014 of described audion VT7；The model 9015 of described audion VT8.
The present invention uses superposition superaudio signal to eliminate the intermodulation distortion in AB class power amplifier, and solve power big time the problem easily generated heat.
The biasing resistor of tradition AB genus audio power amplifier will bring the problem of DC power.Can alternate conduction in order to ensure in tradition AB power-like amplifier to recommend audion for two, in alternate conduction moment, two pipes will maintain lightly conducting state thus not produce intermodulation distortion, it is desirable to provide direct current biasing resistance, the problem thus bringing DC power.
If eliminating the direct current biasing of AB class audio frequency power amplification, then be known as B class power amplifier, being then bound to produce the problem of intermodulation distortion, this produces serious distortion by making to amplify audio signal, and tonequality is impaired.
The problem of tradition AB class audio frequency power amplifier heating.Owing to there being the existence of biasing resistor, can not be zero by recommending the DC current of audion, when power is bigger, along with the increase of electric current, the temperature falling-rising of audion be high, badly influences stability and the life-span of power amplifier.
The direct current biasing of conventional power amplifier is removed by the present invention；Oscillating circuit is used to produce superaudio signal (20-40kHz)；This superaudio signal of superposition in the audio signal of input.Circuit uses differential both-end input mode, therefore itself has preferably suppression work mode noise and the ability of distortion.
The common-base circuit being made up of audion TV1 is feedback amplification, is a performance height, succinct current feedback amplifier, and the open-loop gain of whole current feedback amplifier depends on the resistance size of R9, R10 and R11.Its effect enters profound and negative feedbck to allow power amplifier.
RC phase-shift network forms RC phase shift oscillating circuit with audion TV3, is the pith of superaudio oscillating circuit.Wherein, C1, C2, C3 and R3, R4, R5 constitute RC phase-shift network, and phase shift 180 °；Audion VT3 emitter stage exports, and the input of its high resistant can be with RC phase-shift network good match.Audion VT4 anti-phase amplification oscillator signal and and feed back to phase-shift network；Diode D2 provides an appropriate bias state to audion VT3；Audion VT3, audion VT4 circuit have strong DC negative feedback so that circuit gain is stable, wave distortion is little.Oscillator signal secondary is amplified and reversely exports the superaudio number of 20KHZ by audion VT2.
Audion VT5, audion VT6, audion VT7, audion VT8 constitute typical compound complementary push-pull output stage.Wherein audion TV5 and audion TV7 forms a multiple tube, and equivalence becomes a NPN type triode；Audion TV6 and audion TV8 is equivalent to a PNP type triode.Diode D1 is output stage biased circuit.
Electric capacity C6 is power filtering capacitor.Electric capacity C7 is audio frequency filter capacitor.Power filtering capacitor is for filtering the alternating component interference in power supply；Audio frequency filter capacitor filters superaudio and amplifies signal, it is to avoid feed back to the contingent self-excitation in front end.
Audio signal enters feedback amplification by L1.The effect of L1 is the High-frequency Interference of suppression input audio signal, prevents from the superaudio signal within power amplifier is produced interference.
Audio signal is A point signal phase and the audio signal phase homophase of input in feedback amplification, Fig. 3.After turning on due to D1, internal resistance is little, and the signal that A point is added in the base stage of VT5 and VT6 with B point is it is believed that size and phase place are identical.And the 30kHz superaudio signal that superposition is produced by superaudio oscillating circuit herein.Waveform is as shown in Figure 2.
Now, the audio signal of input makes its quiescent point to offset up due to superposition superaudio signal and degenerative effect.The two groups of complementary Darlington transistors that so can make output stage were both turned within the sinusoidal wave whole cycle, so eliminating intermodulation distortion.Output audio signal is identical with the quiescent point of input audio signal, at outfan serial capacitors C5.Waveform is as shown in Figure 3.
During audion VT1 colelctor electrode exports positive half-cycle signal, audion VT5 and audion VT7 conducting, amplification, audion VT6 and audion VT8 is in cut-off state；During audion VT1 colelctor electrode output negative half-cycle signal, audion VT6 and audion VT8 conducting, amplification, audion VT5 and audion VT7 cut-off.
The signal of two multiple tube outputs exports and feeds back to input stage through R11, and input stage arrives A point after being amplified feedback signal, and superposition superaudio signal carries out audio frequency amplification again.Degenerative effect is that the quiescent point making audio signal is stablized, it is to avoid allow transistor easily generate heat due to the impact of extraneous factor.
It is demonstrated experimentally that power amplifier is used circuit of the present invention, as long as suitably Selection parameter, intermodulation distortion can be completely eliminated.And when input audio signal frequency is higher, intermodulation distortion still can be effectively eliminated.The present invention not only eliminates the intermodulation distortion in power amplifier, and the problem making transistor easily be generated heat by ectocine is improved.
The above embodiment is only the preferred embodiments of the present invention, and and non-invention possible embodiments exhaustive.For persons skilled in the art, any obvious change done to it on the premise of without departing substantially from the principle of the invention and spirit, within all should being contemplated as falling with the claims of the present invention.
Claims (2)
1. the power amplifier of a superposition superaudio signal elimination intermodulation distortion, it is characterised in that: include audion VT1 ~ VT8, resistance R1 ~ R11, electric capacity C1 ~ C7, inductance L1, diode D1 ~ D2, terminal A and terminal B；
Audio signal connects the emitter stage of described audion VT1 through described inductance L1；The emitter stage of described audion VT1 is through described resistance R1 ground connection；The base stage of described audion VT1 connects the emitter stage of described audion VT7 through described resistance R11；
The colelctor electrode of described audion VT1 and the base stage of audion VT6 connect described terminal A respectively；The colelctor electrode of described audion VT2 and the base stage of audion VT5 connect described terminal B respectively；
Described terminal B connects the positive pole of described diode D1；Described terminal A connects the negative pole of described diode D1；
The base stage of described audion VT7 connects the emitter stage of described audion VT5；The base stage of described audion VT8 connects the emitter stage of described audion VT6；
Described resistance R8 is connected between the emitter stage of described audion VT5 and the emitter stage of described audion VT6；
The emitter stage of described audion VT7 connects the emitter stage of audion VT8；
Described electric capacity C6 connects with electric capacity C7 and is followed by between+27V DC source and ground；
The emitter stage of described audion VT7 connects one end of sound equipment LS through described electric capacity C5；The node of described electric capacity C6 and electric capacity C7 connects the other end of sound equipment LS；
Described resistance R9 and resistance R10 connects and is followed by between base stage and the ground of described audion VT8；The node of described resistance R9 and resistance R10 connects the base stage of described audion VT1；
Described electric capacity C4 is connected between base stage and the colelctor electrode of described audion VT1；
The grounded collector of described audion VT6；The grounded collector of described audion VT8；The colelctor electrode of described audion VT5 connects+27V DC source；The colelctor electrode of described audion VT7 connects+27V DC source；
Described resistance R2 is connected between emitter stage and the+27V DC source of described audion VT2；
The base stage of described audion VT2 connects the emitter stage of described audion VT3；
The colelctor electrode of described audion VT3 connects+27V DC source；The emitter stage of described audion VT3 is through described resistance R6 ground connection；
The emitter stage of described audion VT4 connects+27V DC source；The colelctor electrode of described audion VT4 is through described resistance R7 ground connection；The base stage of described audion VT4 connects the base stage of described audion VT2 successively through described resistance R3, diode D2；
Described electric capacity C3 is connected between colelctor electrode and the base stage of described audion VT4；
Described resistance R4 with R5 connects and is followed by between the base stage and the colelctor electrode of audion VT4 of described audion VT3；Described electric capacity C1 is connected between base stage and the+27V DC source of described audion VT3；Described electric capacity C2 is connected between node and the+27V DC source of described resistance R4 and R5.
A kind of superposition superaudio signal the most according to claim 1 eliminates the power amplifier of intermodulation distortion, it is characterised in that: described audion VT1 ~ VT3, audion VT5, the model of audion VT7 are 9014；The model 9015 of described audion VT4, audion VT6, the model of audion VT8 are 9015.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855252A (en) * | 2019-11-20 | 2020-02-28 | 许昌开普检测研究院股份有限公司 | Current expansion circuit of power operational amplifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205622601U (en) * | 2016-03-24 | 2016-10-05 | 河北师范大学 | Super audio signal that superposes eliminates crossover distortion's power amplifier circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205622601U (en) * | 2016-03-24 | 2016-10-05 | 河北师范大学 | Super audio signal that superposes eliminates crossover distortion's power amplifier circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855252A (en) * | 2019-11-20 | 2020-02-28 | 许昌开普检测研究院股份有限公司 | Current expansion circuit of power operational amplifier |
| CN110855252B (en) * | 2019-11-20 | 2023-07-14 | 许昌开普检测研究院股份有限公司 | Current spreading circuit of power operational amplifier |
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Effective date of registration: 20191218 Address after: 050000 room 510, unit 4, Hantong business building, No.88 Yanshan street, hi tech Zone, Shijiazhuang City, Hebei Province Patentee after: Hebei far haha Communications Technology Co., Ltd. Address before: 050024 No. 20 South Second Ring Road, Hebei, Shijiazhuang Patentee before: Hebei Normal University |
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