CN103117718B - high-fidelity transistor audio power amplifier - Google Patents

high-fidelity transistor audio power amplifier Download PDF

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CN103117718B
CN103117718B CN201310038497.1A CN201310038497A CN103117718B CN 103117718 B CN103117718 B CN 103117718B CN 201310038497 A CN201310038497 A CN 201310038497A CN 103117718 B CN103117718 B CN 103117718B
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circuit
triode
power
darlington
collector electrode
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CN103117718A (en
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秦冬成
谭长云
黄文斌
蒙梁
刘达见
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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Abstract

The present invention discloses a kind of High-fidelity transistor audio power amplifier, and it is primarily of pre-amplifier and post-amplifier composition.Wherein the input of pre-amplifier is connected with the audio input signal that external audio input unit inputs, and the output of post-amplifier is connected with external audio output device, and the output of pre-amplifier is connected by resistance with the input of post-amplifier.Post-amplifier is primarily of cascode differential input stage circuit, cascode principal voltage amplification grade circuit, U bEmultiplication and temperature protection circuit, three grades of Darlington push-pull output stage circuit of improvement, alternating current-direct current negative-feedback circuit, active servo circuit, filter circuit of pressure-stabilizing, constant-current source circuit, mirror-image constant flow source circuit, 2 RC rc filter circuits, 4 capacitor filters, loudspeaker protective circuits and the rear class power circuits compositions to their power supplies.This High-fidelity transistor audio power amplifier, achieves the direct current of circuit and broadband and effectively can improve sense of hearing.

Description

High-fidelity transistor audio power amplifier
Technical field
The present invention relates to a kind of audio frequency power amplifier field, be specifically related to a kind of High-fidelity transistor audio power amplifier.
Background technology
At present, family expenses transistor high-fidelity audio power amplifier, domestic electronic pipe high-fidelity audio power amplifier, power professional audio amplifier, automobile audio audio-frequency power amplifier are all in develop rapidly.Existing transistor audio-frequency power amplifier is made up of pre-amplifier and post-amplifier usually, I has seen many circuit both domestic and external, comprise the audio-frequency power amplifier of the states such as the U.S., Britain, Germany, no matter be prime or post-amplifier, in order to make circuit stability work, all add coupling capacitance at the signal input part of the signal input part of pre-amplifier, output and post-amplifier, but the coupling capacitance added can produce certain adverse effect to the frequency response of amplifier and tonequality.And the circuit of their design exports from emitter (drain electrode) substantially, unfavorable to sense of hearing.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of High-fidelity transistor audio power amplifier, and it can not only the direct current of realizing circuit and broadband and effectively can improve sense of hearing.
For solving the problem, the present invention is achieved by the following technical solutions:
A kind of High-fidelity transistor audio power amplifier, primarily of pre-amplifier and post-amplifier composition.Post-amplifier is primarily of cascode differential input stage circuit, cascode principal voltage amplification grade circuit, U bEmultiplication and temperature protection circuit, three grades of Darlington push-pull output stage circuit of improvement, alternating current-direct current negative-feedback circuit, active servo circuit, filter circuit of pressure-stabilizing, constant-current source circuit, mirror-image constant flow source circuit, loudspeaker protective circuit and the rear class power circuit composition to their power supplies.
The three grades of Darlington push-pull output stage circuit improved are primarily of level Darlington circuit to be connected with second of level Darlington circuit Wednesday and to form Wednesday three grades of Darlington circuits i.e. first of 2 specular.Upper half Darlington circuit and lower half Darlington circuit are all primarily of 3 grades of triode compound compositions.The wherein prime power triode VT of upper half Darlington circuit 113emitter and intergrade pliotron VT 115base stage be connected, intergrade pliotron VT 115collector electrode and final power triode VT 117base stage be connected.The prime power triode VT of upper half Darlington circuit 113collector electrode, intergrade pliotron VT 115collector electrode by resistance R 123afterwards, final power triode VT 117emitter by resistance R 128all be connected with the positive pole of rear class power circuit afterwards.Equally, the prime power triode VT of lower half Darlington circuit 114emitter and intergrade pliotron VT 116base stage be connected, intergrade pliotron VT 116collector electrode and final power triode VT 118base stage be connected.The prime power triode VT of lower half Darlington circuit 114collector electrode, intergrade pliotron VT 116collector electrode by resistance R 126afterwards, final power triode VT 118emitter by resistance R 127be connected with the negative pole of rear class power circuit afterwards.The prime power triode VT of upper half Darlington circuit 113emitter and the prime power triode VT of lower half Darlington circuit 114emitter by resistance R 122, R 121be connected, the intergrade pliotron VT of upper half Darlington circuit 115emitter and the intergrade pliotron VT of lower half Darlington circuit 116emitter by resistance R 124, R 125be connected, the final power triode VT of upper half Darlington circuit 117collector electrode and the final power triode VT of lower half Darlington circuit 118collector electrode to be directly connected the output of three grades of Darlington push-pull output stage circuit being formed and improve.
Cascode differential input stage circuit is primarily of 2 technotron VT 101, VT 102with 2 double pole triode VT 103, VT 104composition.Technotron VT 101drain electrode connect double pole triode VT 103emitter, technotron VT 102drain electrode connect double pole triode VT 104emitter.2 technotron VT 101, VT 102source electrode respectively after balance resistance is connected, be connected through the negative pole of constant-current source circuit with rear class power circuit.2 double pole triode VT 103, VT 104base stage be directly connected after, be connected through the positive pole of filter circuit of pressure-stabilizing with rear class power circuit.Double pole triode VT 103collector electrode through load resistance R 107be connected to the positive pole of rear class power circuit.Double pole triode VT 104collector electrode through load resistance R 108be connected to the positive pole of rear class power circuit.The output of pre-amplifier is through resistance R 101with the technotron VT of cascode differential input stage circuit 101grid connect.
Cascode principal voltage amplification grade circuit is primarily of 4 double pole triode VT 105, VT 106, VT 107, VT 108composition.Double pole triode VT 105collector electrode and double pole triode VT 107emitter be connected.Double pole triode VT 106collector electrode and double pole triode VT 108emitter be connected.Double pole triode VT 107base stage and double pole triode VT 108base stage be connected after be divided into 2 tunnels, a road is through resistance R 112be connected with the common of post-amplifier, a road is through voltage stabilizing didoe VD 102be connected with the positive pole of rear class power circuit afterwards.Double pole triode VT 105emitter and double pole triode VT 106emitter be connected after through resistance R 111be connected with the positive pole of rear class power circuit.Double pole triode VT 105base stage connect the double pole triode VT of cascode differential input stage circuit 104collector electrode.Double pole triode VT 106base stage connect the double pole triode VT of cascode differential input stage circuit 103collector electrode.Double pole triode VT 107collector electrode be connected with the negative pole of rear class power circuit after mirror-image constant flow source circuit.Double pole triode VT 108collector electrode through U bEbe connected with the input of the three grades of Darlington push-pull output stage circuit improved after multiplication and temperature protection circuit.
The output of the three grades of Darlington push-pull output stage circuit improved is connected with external audio output device after loudspeaker protective circuit.
The prime power triode VT of the input of alternating current-direct current negative-feedback circuit and three of improvement grades of Darlington push-pull output stage circuit 113, VT 114emitter be connected end or final power triode VT 117, VT 118collector electrode be connected end connect, the output of alternating current-direct current negative-feedback circuit and the technotron VT of cascode differential input stage circuit 102grid connect.
The final power triode VT of three grades of Darlington push-pull output stage circuit of the input Innovation of Connection of active servo circuit 117, VT 118collector electrode to be connected output, the output of active servo circuit connects technotron VT 102grid.
As improvement, this High-fidelity transistor audio power amplifier also comprises the power expansion circuit of 2 specular and upper half power expansion circuit and lower half power expansion circuit further.The wherein pliotron VT of upper half power expansion circuit 119base stage through resistance R 131afterwards with intergrade pliotron VT 115collector electrode be connected, pliotron VT 119collector electrode and final power triode VT 117collector electrode be connected, pliotron VT 119emitting stage through resistance R 133be connected with the positive pole of rear class power circuit afterwards.The pliotron VT of lower half power expansion circuit 120base stage through resistance R 135afterwards with intergrade pliotron VT 116collector electrode be connected, pliotron VT 120collector electrode and final power triode VT 118collector electrode be connected, pliotron VT 120emitting stage through resistance R 136be connected with the negative pole of rear class power circuit.In addition, more high power valve connects and carries out that more powerful expanded circuit is similar carries out cascade.
In such scheme, first Wednesday level Darlington push-pull output stage circuit output and the positive pole of rear class power circuit between and be connected to a protection diode VD 104, second Wednesday level Darlington push-pull output stage circuit output and the negative pole of rear class power circuit between and be connected to a protection diode VD 105.
As the improvement of above-mentioned either a program, between the positive pole of described rear class power circuit and cascode principal voltage amplification grade circuit and between the negative pole of rear class power circuit and mirror-image constant flow source circuit, be respectively connected to a RC rc filter circuit.
As the improvement of above-mentioned either a program, the final power triode VT of three grades of Darlington push-pull output stage circuit of improvement 117, VT 118for power field effect pipe.
As the improvement of above-mentioned either a program, between cascode differential input stage circuit and cascode principal voltage amplification grade circuit, between constant-current source circuit and mirror-image constant flow source circuit, first Wednesday level Darlington circuit and the positive pole of rear class power circuit between and second Wednesday level Darlington circuit and the negative pole of rear class power circuit between be respectively connected to a capacitor filter.
In such scheme, described pre-amplifier comprises volume control circuit, oppositely scaling circuit and second order active and penetrates with circuit and to the prime power circuit of their power supplies.The input of volume control circuit is directly connected with external audio input unit, the output of volume control circuit connects reverse scaling circuit successively and second order active is penetrated with circuit, the second order active output penetrated with circuit is the output of pre-amplifier, can directly be connected with post-amplifier.
Compared with prior art, the present invention has following features:
1, the coupling capacitance in the input stage of (as between pre-amplifier and audio signal, between pre-amplifier and post-amplifier) and post-amplifier on signal path is eliminated, thus avoid the impact that coupling capacitance produces tonequality, tonequality is significantly promoted;
2, the input stage of post-amplifier uses technotron composition cascode differential input level, is obtained the positive and negative power supply of work, junction type (JFET) field effect transistor U on signal path by rear class power circuit simultaneously g=0V, while guaranteeing that circuit normally works, achieves the direct current of circuit and broadband;
3, the second level of post-amplifier also uses cascode differential voltage amplifier circuit, can improve frequency response and the driving force of circuit further;
4, the output stage of post-amplifier is the three grades of Darlington circuits improved, and export from the collector electrode (drain electrode) of final power triode but not emitter (source electrode) output, do like this, the sense of hearing of whole frequency range can be made softer, fine and smooth, effectively can improve sense of hearing;
5, when negative feedback is chosen from drive(r) stage, the stability of circuit can be improved, reduce loud speaker back electromotive force to the interference of circuit, impact, thus improve sense of hearing.And when negative feedback is chosen from output stage, then the internal resistance of circuit can be made lower, low frequency is better.
6, negative feedback uses active servo circuit simultaneously, makes the midpoint potential of output stage remain 0 current potential.
7, complete machine direct current, signal path does not have coupling capacitance.Output stage uses loudspeaker to protect special circuit, if audio amplifier is connected in time delay of starting shooting, shutdown, midpoint potential inclined zero too many disconnection immediately audio amplifier defencive function, can allow the circuit of direct current more stablize and safer work.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of pre-amplifier;
Fig. 2 is the circuit theory diagrams of prime power circuit in pre-amplifier;
Fig. 3 is a kind of circuit theory diagrams (input of alternating current-direct current negative-feedback circuit is connected with the elementary connected end of three of improvement grades of Darlington push-pull output stage circuit) of post-amplifier;
Fig. 4 is the circuit theory diagrams (input of alternating current-direct current negative-feedback circuit is connected to hold with the final stage of three of improvement grades of Darlington push-pull output stage circuit and is connected) of another kind of post-amplifier;
Fig. 5 is the circuit theory diagrams (input of alternating current-direct current negative-feedback circuit is connected with the final stage of three of improvement grades of Darlington push-pull output stage circuit to hold and is connected and the final power triode of the three grades of Darlington push-pull output stage circuit improved is field effect transistor) of another post-amplifier;
Fig. 6 is the circuit theory diagrams (input of alternating current-direct current negative-feedback circuit is connected with the elementary connected end of three of improvement grades of Darlington push-pull output stage circuit) of 2 power expansion circuit of three grades of Darlington push-pull output stage circuit of described improvement;
Fig. 7 is the circuit theory diagrams of rear class power circuit in post-amplifier.
Embodiment
Embodiment 1:
See Fig. 3, a kind of High-fidelity transistor audio power amplifier is primarily of pre-amplifier and post-amplifier composition.Wherein the input of pre-amplifier is connected with the audio input signal that external audio input unit inputs, the output of post-amplifier is connected with external audio output device (as external speaker system), and the output of pre-amplifier is connected by resistance with the input of post-amplifier.This High-fidelity transistor audio power amplifier, achieves the direct current of circuit and broadband and effectively can improve sense of hearing.
Above-mentioned pre-amplifier as shown in Figure 1, is penetrated form with circuit primarily of the volume control circuit be connected with signal source circuit, oppositely scaling circuit and second order active.The input of volume control circuit is directly connected with external audio input unit.The output of volume control circuit connects reverse scaling circuit successively and second order active is penetrated with circuit, and the second order active output penetrated with circuit is the output of pre-amplifier.The electrical schematic diagram of the prime power circuit of pre-amplifier as shown in Figure 2.
Above-mentioned post-amplifier is core point of the present invention, primarily of cascode differential input stage circuit, cascode principal voltage amplification grade circuit, U bEmultiplication and temperature protection circuit, three grades of Darlington push-pull output stage circuit of improvement, alternating current-direct current negative-feedback circuit, active servo circuit, filter circuit of pressure-stabilizing, constant-current source circuit, mirror-image constant flow source circuit, 2 RC rc filter circuits, 4 capacitor filters, loudspeaker protective circuits and the rear class power circuits compositions to their power supplies.The circuit theory diagrams of rear class power circuit as shown in Figure 7.
The three grades of Darlington push-pull output stage circuit improved are primarily of level Darlington circuit to be connected with second of level Darlington circuit Wednesday and to form Wednesday three grades of Darlington circuits i.e. first of 2 specular.Upper half Darlington circuit and lower half Darlington circuit are all primarily of 3 grades of triode compound compositions.The wherein prime power triode VT of upper half Darlington circuit 113emitter and intergrade pliotron VT 115base stage be connected, intergrade pliotron VT 115collector electrode and final power triode VT 117base stage be connected.The prime power triode VT of upper half Darlington circuit 113collector electrode, intergrade pliotron VT 115collector electrode by resistance R 123afterwards, final power triode VT 117emitter by resistance R 128all be connected with the positive pole of rear class power circuit afterwards.Equally, the prime power triode VT of lower half Darlington circuit 114emitter and intergrade pliotron VT 116base stage be connected, intergrade pliotron VT 116collector electrode and final power triode VT 118base stage be connected.The prime power triode VT of lower half Darlington circuit 114collector electrode, intergrade pliotron VT 116collector electrode by resistance R 126afterwards, final power triode VT 118emitter by resistance R 127be connected with the negative pole of rear class power circuit afterwards.The prime power triode VT of upper half Darlington circuit 113emitter and the prime power triode VT of lower half Darlington circuit 114emitter by resistance R 122, R 121be connected, the intergrade pliotron VT of upper half Darlington circuit 115emitter and the intergrade pliotron VT of lower half Darlington circuit 116emitter by resistance R 124, R 125be connected, the final power triode VT of upper half Darlington circuit 117collector electrode and the final power triode VT of lower half Darlington circuit 118collector electrode to be directly connected the output of three grades of Darlington push-pull output stage circuit being formed and improve.
For promoting tonequality, elementary, intergrade and the final stage high power valve of the three grades of Darlington push-pull output stage circuit improved preferably select the triode that cut-off frequency is high, and output-stage power pipe can select the high power valves such as bipolarity pipe C5200/A1943, C2922/A1216, MJL4281A/MJL4302A or field effect transistor 2SK1530/2SJ201.In addition, the power-handling capability of prime power triode, intermediate power triode, final power triode increases successively.
In addition, in the present invention, first Wednesday level Darlington push-pull output stage circuit output and the positive pole of rear class power circuit between and be connected to a protection diode VD 104, second Wednesday level Darlington push-pull output stage circuit output and the negative pole of rear class power circuit between and be connected to a protection diode VD 105.In the present embodiment, diode VD is protected 104anode be connected to final power triode VT 117collector electrode, protection diode VD 104negative electrode be connected to the positive pole of rear level power supply; Protection diode VD 105negative electrode be connected to final power triode VT 118collector electrode, protection diode VD 105anode be connected to the negative pole of rear level power supply.
Cascode differential input stage circuit is primarily of 2 technotron VT 101, VT 102with 2 double pole triode VT 103, VT 104composition.Technotron VT 101drain electrode connect double pole triode VT 103emitter, technotron VT 102drain electrode connect double pole triode VT 104emitter.2 technotron VT 101, VT 102source electrode respectively after balance resistance is connected, be connected through the negative pole of constant-current source circuit with rear class power circuit.2 double pole triode VT 103, VT 104base stage be directly connected after, be connected through the positive pole of filter circuit of pressure-stabilizing with rear class power circuit.Double pole triode VT 103collector electrode through load resistance R 107be connected to the positive pole of rear class power circuit.Double pole triode VT 104collector electrode through load resistance R 108also the positive pole of rear class power circuit is connected to.The output of pre-amplifier is through resistance R 101with the technotron VT of cascode differential input stage circuit 101grid connect.
Cascode principal voltage amplification grade circuit is primarily of 4 double pole triode VT 105, VT 106, VT 107, VT 108composition.Double pole triode VT 105collector electrode and double pole triode VT 107emitter be connected.Double pole triode VT 106collector electrode and double pole triode VT 108emitter be connected.Double pole triode VT 107base stage and double pole triode VT 108base stage be connected after be divided into 2 tunnels, a road is through resistance R 112be connected with the common of post-amplifier, a road is through voltage stabilizing didoe VD 102be connected with the positive pole of rear class power circuit afterwards.Double pole triode VT 105emitter and double pole triode VT 106emitter be connected after through resistance R 111be connected with the positive pole of rear class power circuit.Double pole triode VT 105base stage connect the double pole triode VT of cascode differential input stage circuit 104collector electrode.Double pole triode VT 106base stage connect the double pole triode VT of cascode differential input stage circuit 103collector electrode.Double pole triode VT 107collector electrode be connected with the negative pole of rear class power circuit after mirror-image constant flow source circuit.Double pole triode VT 108collector electrode through U bEbe connected with the input of the three grades of Darlington push-pull output stage circuit improved after multiplication and temperature protection circuit.
The output of the three grades of Darlington push-pull output stage circuit improved is connected with external audio output device after loudspeaker protective circuit.In the present embodiment, the final power triode VT of three grades of Darlington push-pull output stage circuit of improvement 117, VT 118the be connected output of end and post-amplifier of collector electrode be directly connected with external speaker system by the relay switching point of loudspeaker protective circuit.Common audio-frequency power amplifier, output stage exports from the emitter (or source electrode) of final power triode substantially, but when driving speaker system, because speaker system is inductive load, current mode load, during such driving, peaceful slow, rear edge, forward position can only be obtained and fall steep current waveform, the feature of to violate on human auditory soon, going slowly, thus sense of hearing has the sensation of " cold ", " firmly ", and sense of hearing is undesirable.In order to improve sense of hearing, the output stage of post-amplifier of the present invention adopts OCL to export equally, but external speaker system is connected to the final power triode VT of three grades of Darlington push-pull output stage circuit of improvement 117, VT 118collector electrode on, namely export from collector electrode (or drain electrode), such speaker system series connection is on collector electrode (or drain electrode), namely be connected on the constant-current source of β Ib, the change of load does not affect the electric current passed through, when thus driving the speaker system of perception, the feeling of " cold " in sense of hearing, " firmly " improves, and makes the sense of hearing of whole frequency range softer, fine and smooth.
Alternating current-direct current negative-feedback circuit is primarily of resistance R 115, R 142, R 141with electric capacity C 128composition.The prime power triode VT of the input of alternating current-direct current negative-feedback circuit and three of improvement grades of Darlington push-pull output stage circuit 113, VT 114emitter be connected end connect, the output of alternating current-direct current negative-feedback circuit and the technotron VT of cascode differential input stage circuit 102grid connect.The output of alternating current-direct current feedback circuit and the technotron VT of cascode differential input stage circuit 102grid connect, and use active servo circuit, make output stage mid point remain 0 current potential.In order to make more stable, the safer work of the circuit of direct current; output stage in the present invention uses Upc1237C loudspeaker protection application-specific integrated circuit (ASIC); if connect audio amplifier after start time delay about 5 seconds i.e. circuit stability; shutdown, midpoint potential inclined zero too many disconnection immediately audio amplifier defencive function, the audio amplifier of protective price costliness.
Active servo circuit primarily of operational amplifier, diode VD 109, VD 110, voltage stabilizing didoe VD 111, VD 112, electrochemical capacitor C 124, C 125, electric capacity C 126, C 127, C 123, C 122, resistance R 138, R 139, R 137, R 140, R 136composition.The final power triode VT of three grades of Darlington push-pull output stage circuit of the input Innovation of Connection of active servo circuit 117, VT 118collector electrode to be connected end, the output of active servo circuit connects technotron VT 102grid.
Filter circuit of pressure-stabilizing is primarily of voltage stabilizing didoe VD 101, electric capacity C 103, C 104with resistance R 105, R 106form.
Constant-current source circuit is primarily of triode VT 109, voltage stabilizing didoe VD 103, electric capacity C 101, C 102with resistance R 109, R 110form.
Mirror-image constant flow source circuit is primarily of triode VT 110, VT 111with resistance R 114, R 115, R 122composition.
U bEmultiplication and temperature protection circuit are primarily of triode VT 112, potentiometer VR 102, resistance R 116, R 117, R 118with electric capacity C 111, C 112composition.
The first capacitor filter in 4 capacitor filters is by electric capacity C 105, C 106composition, and be connected between rear class power circuit positive pole and cascode differential input stage circuit.Second capacitor filter is by electric capacity C 107, C 108composition, and be connected between rear class power circuit negative pole and mirror-image constant flow source circuit.3rd capacitor filter is by electric capacity C 115, C 116composition, and connect between rear class power circuit positive pole and first level Darlington push-pull output stage circuit Wednesday.4th capacitor filter is by electric capacity C 118, C 119composition, and connect between rear class power circuit negative pole and second level Darlington push-pull output stage circuit Wednesday.
A RC rc filter circuit in 2 RC rc filter circuits is by electric capacity C 109, C 110with resistance R 119composition, and be connected between rear class power circuit positive pole and cascode principal voltage amplification grade circuit.2nd RC rc filter circuit is by electric capacity C 113, C 114with resistance R 120composition, and be connected between rear class power circuit negative pole and mirror-image constant flow source circuit.
Embodiment 2
See Fig. 4, embodiment 2 is substantially identical with embodiment 1, and its difference is the final power triode VT of the input of alternating current-direct current negative-feedback circuit and three grades of Darlington push-pull output stage circuit of improvement 117, VT 118collector electrode be connected end and output connection.
Embodiment 3
See Fig. 5, embodiment 3 is substantially identical with embodiment 2, and its difference is the final power triode VT of three grades of Darlington push-pull output stage circuit of described improvement 117, VT 118for power field effect pipe.See Fig. 5.Now, relevant final power triode VT in embodiment 1 117, VT 118in base stage be final power triode VT 117, VT 118in grid; Relevant final power triode VT in embodiment 1 117, VT 118in emitter be final power triode VT 117, VT 118in source electrode; Relevant final power triode VT in embodiment 1 117, VT 118in collector electrode be final power triode VT 117, VT 118in drain electrode.
Embodiment 4:
See Fig. 6, embodiment 4 is substantially identical with embodiment 1, its difference is to realize power expansion, also comprises the power expansion circuit of 2 specular and upper half power expansion circuit and lower half power expansion circuit after three grades of Darlington push-pull output stage circuit of described improvement further; The wherein pliotron VT of upper half power expansion circuit 119base stage through resistance R 131afterwards with intergrade pliotron VT 115collector electrode be connected, pliotron VT 119collector electrode and final power triode VT 117collector electrode be connected, pliotron VT 119emitting stage through resistance R 133be connected with the positive pole of rear class power circuit afterwards; The pliotron VT of lower half power expansion circuit 120base stage through resistance R 135afterwards with intergrade pliotron VT 116collector electrode be connected, pliotron VT 120collector electrode and final power triode VT 118collector electrode be connected, pliotron VT 120emitting stage through resistance R 136be connected with the negative pole of rear class power circuit.In addition, pliotron VT 115collector electrode and pliotron VT 117base stage between be also connected to the resistance R of 33 Ω 132in case self-excitation; Pliotron VT 116collector electrode and pliotron VT 118base stage between be also connected to the resistance R of 33 Ω 134in case self-excitation.
Now, diode VD is protected 104, VD 105between the output being connected in parallel on three grades of Darlington push-pull output stage circuit of improvement equally and the both positive and negative polarity of rear class power circuit, namely protect diode VD 104anode be connected to pliotron VT 119collector electrode, protection diode VD 104negative electrode be connected to the positive pole of rear class power circuit; Protection diode VD 105negative electrode be connected to final power triode VT 120collector electrode, protection diode VD 105anode be connected to the negative pole of rear class power circuit.

Claims (7)

1. High-fidelity transistor audio power amplifier, primarily of pre-amplifier and post-amplifier composition; It is characterized in that: post-amplifier is primarily of cascode differential input stage circuit, cascode principal voltage amplification grade circuit, U bEmultiplication and temperature protection circuit, three grades of Darlington push-pull output stage circuit of improvement, alternating current-direct current negative-feedback circuit, active servo circuit, filter circuit of pressure-stabilizing, constant-current source circuit, mirror-image constant flow source circuit, loudspeaker protective circuit and the rear class power circuit composition to their power supplies;
The three grades of Darlington push-pull output stage circuit improved are primarily of level Darlington circuit to be connected with second of level Darlington circuit Wednesday and to form Wednesday three grades of Darlington circuits i.e. first of 2 specular; Upper half Darlington circuit and lower half Darlington circuit are all primarily of 3 grades of triode compound compositions; The wherein prime power triode VT of upper half Darlington circuit 113emitter and intergrade pliotron VT 115base stage be connected, intergrade pliotron VT 115collector electrode and final power triode VT 117base stage be connected; The prime power triode VT of upper half Darlington circuit 113collector electrode, intergrade pliotron VT 115collector electrode by resistance R 123afterwards, final power triode VT 117emitter by resistance R 128all be connected with the positive pole of rear class power circuit afterwards; Equally, the prime power triode VT of lower half Darlington circuit 114emitter and intergrade pliotron VT 116base stage be connected, intergrade pliotron VT 116collector electrode and final power triode VT 118base stage be connected; The prime power triode VT of lower half Darlington circuit 114collector electrode, intergrade pliotron VT 116collector electrode by resistance R 126afterwards, final power triode VT 118emitter by resistance R 127be connected with the negative pole of rear class power circuit afterwards; The prime power triode VT of upper half Darlington circuit 113emitter and the prime power triode VT of lower half Darlington circuit 114emitter by resistance R 122, R 121be connected, the intergrade pliotron VT of upper half Darlington circuit 115emitter and the intergrade pliotron VT of lower half Darlington circuit 116emitter by resistance R 124, R 125be connected, the final power triode VT of upper half Darlington circuit 117collector electrode and the final power triode VT of lower half Darlington circuit 118collector electrode be directly connected;
Cascode differential input stage circuit is primarily of 2 technotron VT 101, VT 102with 2 double pole triode VT 103, VT 104composition; Technotron VT 101drain electrode connect double pole triode VT 103emitter, technotron VT 102drain electrode connect double pole triode VT 104emitter; 2 technotron VT 101, VT 102source electrode respectively after balance resistance is connected, be connected through the negative pole of constant-current source circuit with rear class power circuit; 2 double pole triode VT 103, VT 104base stage be directly connected after, be connected through the positive pole of filter circuit of pressure-stabilizing with rear class power circuit; Double pole triode VT 103collector electrode through load resistance R 107be connected to the positive pole of rear class power circuit; Double pole triode VT 104collector electrode through load resistance R 108be connected to the positive pole of rear class power circuit; The output of pre-amplifier is through resistance R 101with the technotron VT of cascode differential input stage circuit 101grid be connected to form the output of three grades of Darlington push-pull output stage circuit of improvement;
Cascode principal voltage amplification grade circuit is primarily of 4 double pole triode VT 105, VT 106, VT 107, VT 108composition; Double pole triode VT 105collector electrode and double pole triode VT 107emitter be connected; Double pole triode VT 106collector electrode and double pole triode VT 108emitter be connected; Double pole triode VT 107base stage and double pole triode VT 108base stage be connected after be divided into 2 tunnels, a road is through resistance R 112be connected with the common of post-amplifier, a road is through voltage stabilizing didoe VD 102be connected with the positive pole of rear class power circuit afterwards; Double pole triode VT 105emitter and double pole triode VT 106emitter be connected after through resistance R 111be connected with the positive pole of rear class power circuit; Double pole triode VT 105base stage connect the double pole triode VT of cascode differential input stage circuit 104collector electrode; Double pole triode VT 106base stage connect the double pole triode VT of cascode differential input stage circuit 103collector electrode; Double pole triode VT 107collector electrode be connected with the negative pole of rear class power circuit after mirror-image constant flow source circuit; Double pole triode VT 108collector electrode through U bEbe connected with the input of the three grades of Darlington push-pull output stage circuit improved after multiplication and temperature protection circuit;
The output of the three grades of Darlington push-pull output stage circuit improved is connected with external audio output device after loudspeaker protective circuit;
The prime power triode VT of the input of alternating current-direct current negative-feedback circuit and three of improvement grades of Darlington push-pull output stage circuit 113, VT 114emitter be connected end or final power triode VT 117, VT 118collector electrode be connected end connect, the output of alternating current-direct current negative-feedback circuit and the technotron VT of cascode differential input stage circuit 102grid connect;
The final power triode VT of three grades of Darlington push-pull output stage circuit of the input Innovation of Connection of active servo circuit 117, VT 118collector electrode to be connected end, the output of active servo circuit connects technotron VT 102grid.
2. High-fidelity transistor audio power amplifier according to claim 1, is characterized in that: also comprise the power expansion circuit of 2 specular and upper half power expansion circuit and lower half power expansion circuit further; The wherein pliotron VT of upper half power expansion circuit 119base stage through resistance R 131afterwards with intergrade pliotron VT 115collector electrode be connected, pliotron VT 119collector electrode and final power triode VT 117collector electrode be connected, pliotron VT 119emitting stage through resistance R 133be connected with the positive pole of rear class power circuit afterwards; The pliotron VT of lower half power expansion circuit 120base stage through resistance R 135afterwards with intergrade pliotron VT 116collector electrode be connected, pliotron VT 120collector electrode and final power triode VT 118collector electrode be connected, pliotron VT 120emitting stage through resistance R 136be connected with the negative pole of rear class power circuit.
3. High-fidelity transistor audio power amplifier according to claim 1 and 2, is characterized in that: first Wednesday level Darlington push-pull output stage circuit output and the positive pole of rear class power circuit between and be connected to a protection diode VD 104, second Wednesday level Darlington push-pull output stage circuit output and the negative pole of rear class power circuit between and be connected to a protection diode VD 105.
4. High-fidelity transistor audio power amplifier according to claim 1 and 2, is characterized in that: be respectively connected to a RC rc filter circuit between the positive pole of rear class power circuit and cascode principal voltage amplification grade circuit and between the negative pole of rear class power circuit and mirror-image constant flow source circuit.
5. High-fidelity transistor audio power amplifier according to claim 1 and 2, is characterized in that: the final power triode VT of three grades of Darlington push-pull output stage circuit of improvement 117, VT 118for power field effect pipe.
6. High-fidelity transistor audio power amplifier according to claim 1 and 2, is characterized in that: between cascode differential input stage circuit and cascode principal voltage amplification grade circuit, between constant-current source circuit and mirror-image constant flow source circuit, first Wednesday level Darlington circuit and the positive pole of rear class power circuit between and second Wednesday level Darlington circuit and the negative pole of rear class power circuit between be respectively connected to a capacitor filter.
7. High-fidelity transistor audio power amplifier according to claim 1, is characterized in that: described pre-amplifier comprises volume control circuit, oppositely scaling circuit and second order active and penetrates with circuit and to the prime power circuit of their power supplies; The input of volume control circuit is directly connected with external audio input unit, the output of volume control circuit connects reverse scaling circuit successively and second order active is penetrated with circuit, the second order active output penetrated with circuit is the output of pre-amplifier, can directly be connected with post-amplifier.
CN201310038497.1A 2013-01-31 2013-01-31 high-fidelity transistor audio power amplifier Expired - Fee Related CN103117718B (en)

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