CN103458341B - A kind of audio frequency amplifier adjunct circuit being applied to cancel emitter-base bandgap grading output stage - Google Patents
A kind of audio frequency amplifier adjunct circuit being applied to cancel emitter-base bandgap grading output stage Download PDFInfo
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Abstract
The invention discloses a kind of audio frequency amplifier adjunct circuit being applied to cancel emitter-base bandgap grading output stage, including testing circuit, amplifying circuit and adjustable constant flow source circuit, described testing circuit is made up of diode and audion, described diode is connected with the base stage of described audion, described testing circuit is produced reference voltage by described diode, compares testing circuit composition；Described amplifying circuit is used for amplified current signal；Adjustable constant flow source circuit is used for producing adjustable constant-flow electric current；Wherein, described testing circuit is connected with described amplifying circuit, and described amplifying circuit is connected with described adjustable constant flow source circuit.This adjunct circuit is that reference voltage produces, relatively detection, the amplified entrance adjustable constant flow source circuit of electric current produces adjustable constant-flow electric current makes its output services electric current remain stable for thus controlling audio frequency amplifier, eliminate the emitter-base bandgap grading output of amplifying circuit, achieve colelctor electrode output, eliminate the interference to transistor audio-frequency amplifier output stage of the speaker anti-EMF voltage.
Description
Technical field
The present invention relates to the amplifying circuit field of audio frequency amplifier, especially a kind of adjunct circuit being applied to cancel on the audio-frequency amplifier circuit of emitter-base bandgap grading output stage.
Background technology
At present, on market, all of sound system all adopts DYN dynamic speaker to carry out the broadcasting of sound.According to distracted law, the inductance coil of dynamic speaker can produce back-emf voltage, current transistor audio-frequency amplifier power output stage all adopts the emitter stage way of output of common collector to be main flow, outfan is connected with speaker, when power output stage is at base stage input audio signal, meanwhile, emitter stage has been also fed to the back-emf voltage of speaker, and emitter-base bandgap grading output stage duty can be caused certain interference by this back-emf voltage.
And from three configurations of transistor amplifier circuit: common emitter circuit, common-base circuit and common-collector circuit learn that transistor collector only has output function, it does not have input function.Therefore, in order to eliminate the interference to transistor audio-frequency amplifier output stage of the speaker anti-EMF voltage, it is possible to adopt the emitter-base bandgap grading output stage cancelling transistor audio-frequency amplifier, directly export at front pole tension amplifying circuit colelctor electrode.
Adopt field-effect transistor or adopt Darlington circuit, it is possible to achieve directly exporting at prime voltage amplifier circuit colelctor electrode.
Specifically, current transistor audio-frequency amplifier, as shown in Figure 1, output stage T12 and T13 is the emitter-base bandgap grading way of output of common-collector circuit to output stage, and emitter stage connects output, and outfan connects speaker.
T9 constitutes a constant pressure source, provides a common bias voltage Vb for emitter-base bandgap grading output stage T12 and T13.
The transistor audio-frequency amplifier output stage eliminating emitter-base bandgap grading output stage then has accompanying drawing 2 circuit, and its output stage T10 and T11 adopts colelctor electrode to be connected output, output connection speaker.
Referring to accompanying drawing 2, T10 and T11 bias voltage is divided into respective independent, two bias voltage Vb+ and Vb-that voltage is equal, and accompanying drawing 1 emitter-base bandgap grading way of output T9 constant pressure source common bias mode cannot use in the amplifying circuit eliminating emitter-base bandgap grading output.
Vb+ and Vb-bias voltage is produced by preamplifying circuit T7 and T8 collector load resistor RC+ and RC-voltage drop respectively.
As can be seen here, the fluctuation of supply voltage, the change of ambient temperature, all bias voltage Vb+ and the Vb-of T10 and the T11 that T7 and T8 collector load resistor Rc+ and Rc-voltage drop produce can there be is impact, cause T10 and T11 unstable working condition.
So keeping Vb+ and Vb-bias voltage is stably cancel emitter-base bandgap grading output stage, by the key of the transistor audio-frequency amplifier circuit of colelctor electrode output.
It would therefore be highly desirable to provide a kind of scheme to solve the problems referred to above.
Summary of the invention
It is an object of the invention to overcome above-mentioned defect, one is provided to be applicable on transistor audio amplifier circuit, cancel transistor audio amplifier circuit emitter-base bandgap grading output stage to realize exporting from transistor audio amplifier circuit colelctor electrode, and keep the adjunct circuit that output stage is stable.
Being achieved in that of the technical program: a kind of audio frequency amplifier adjunct circuit being applied to cancel emitter-base bandgap grading output stage, including testing circuit, amplifying circuit and adjustable constant flow source circuit, described testing circuit includes diode and audion composition, and described diode is connected with the base stage of described audion
Described testing circuit is produced reference voltage by described diode, compares detection for the voltage difference with triode emission pole tension；
Described amplifying circuit is used for amplified current signal；
Described adjustable constant flow source circuit is used for producing adjustable constant-flow electric current；
Described testing circuit is connected with described amplifying circuit, and described amplifying circuit is connected with described adjustable constant flow source circuit.
Specifically, described testing circuit includes a diode and a detection transistor, and described diode is connected with the base stage of described detection transistor, and the colelctor electrode of described detection transistor is connected with described amplifying circuit.
Specifically, described testing circuit can also include the first relative a pair diode and the second diode, detection PNP triode one group symmetrical and detection NPN audion, the negative pole of described first diode is connected with the base stage of described detection PNP triode, the positive pole of the second diode is connected with the base stage of described detection NPN audion, and the colelctor electrode of described detection PNP triode and detection NPN audion is connected with described amplifying circuit.
Further, described amplifying circuit includes an amplifying triode；Described adjustable constant flow source circuit is made up of a constant-current source PNP triode and a constant-current source NPN audion, and the base stage of described constant-current source PNP triode and constant-current source NPN audion is connected with potentiometer two groups equivalent respectively；The colelctor electrode of described detection transistor is connected with the base stage of described amplifying triode, and the emitter stage of described amplifying triode is connected in series with the potentiometer of described constant-current source PNP triode and constant-current source NPN transistor base respectively by photoelectrical coupler.
Further, described amplifying circuit can also include amplification NPN audion one group symmetrical and amplify PNP triode, described adjustable constant flow source circuit is made up of constant-current source PNP triode one group symmetrical and constant-current source NPN audion, and described constant-current source PNP triode and constant-current source NPN transistor base are connected with potentiometer two groups equivalent respectively；The colelctor electrode of described detection PNP triode is connected with the described ground level amplifying NPN audion, the colelctor electrode of described detection NPN audion is connected with the ground level of described amplification PNP triode, and the described emitter stage amplifying NPN audion and amplification PNP triode is connected in series with the potentiometer of described constant-current source PNP triode and constant-current source NPN transistor base respectively by photoelectrical coupler.
Specifically, potentiometer is the potentiometer of resistance composition.
Further, described amplifying circuit can also include amplification NPN audion one group symmetrical and amplify PNP triode, and described adjustable constant flow source circuit is made up of constant-current source PNP triode one group symmetrical and constant-current source NPN audion；The colelctor electrode of described detection PNP triode is connected with the described ground level amplifying NPN audion, the colelctor electrode of described detection NPN audion is connected with the ground level of described amplification PNP triode, the emitter stage of described constant-current source PNP triode and constant-current source NPN audion and base stage two ends are parallel with the first equal resistance of resistance and the second resistance respectively, described first resistance and the second resistance are connected with described amplification NPN audion and amplification PNP triode respectively, and described first resistance and the second resistance are connected to and described amplify NPN audion and amplify on the colelctor electrode of PNP triode.
Specifically, being in series with series resistance between described amplification NPN audion and amplification PNP triode, described first resistance, amplification NPN audion, series resistance, amplification PNP triode and the second resistance are sequentially connected in series.
The invention have the advantage that adjunct circuit provides reference voltage, relatively detection, Current amplifier enters adjustable constant flow source circuit and produces adjustable constant-flow electric current thus controlling audio amplifier circuit output stage operating current and remaining stable for, eliminate the emitter-base bandgap grading output of amplifying circuit, achieve colelctor electrode output, eliminate the interference to transistor audio-frequency amplifier output stage of the speaker anti-EMF voltage.
Accompanying drawing explanation
Fig. 1 is the emitter-base bandgap grading output amplifier figure of the audio frequency amplifier of prior art.
Fig. 2 is the colelctor electrode output amplifier figure of the audio frequency amplifier of prior art.
Fig. 3 is a kind of schematic block circuit diagram being applied to cancel the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage of the present invention.
Fig. 4 is a kind of embodiment 1 schematic block circuit diagram being applied to cancel the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage of the present invention.
Fig. 5 is a kind of embodiment 1 circuit theory diagrams being applied to cancel the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage of the present invention.
Fig. 6 is a kind of embodiment 2 schematic block circuit diagram being applied to cancel the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage of the present invention.
Fig. 7 is a kind of embodiment 2 circuit theory diagrams being applied to cancel the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage of the present invention.
Fig. 8 is a kind of embodiment 3 schematic block circuit diagram being applied to cancel the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage of the present invention.
Fig. 9 is a kind of embodiment 3 circuit theory diagrams being applied to cancel the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage of the present invention.
Figure 10 is that be applied to a kind of with the present invention cancels the application circuit that the audio frequency amplifier adjunct circuit of emitter-base bandgap grading output stage matches.
Detailed description of the invention
Below in conjunction with accompanying drawing, specific embodiment of the invention case is illustrated:
As it is shown on figure 3, a kind of audio frequency amplifier adjunct circuit being applied to cancel emitter-base bandgap grading output stage, including testing circuit, amplifying circuit and adjustable constant flow source circuit, described testing circuit includes diode and audion, and described diode is connected with the base stage of described audion.Described testing circuit is produced reference voltage by described diode, compares detection for the voltage difference with triode emission pole tension, and described diode adopts switching mode diode.
Described amplifying circuit is used for amplified current signal, the voltage ratio of the diode forward C-V characteristic voltage in testing circuit and the triode emission pole tension in described testing circuit relatively detects, described diode forward C-V characteristic voltage is higher than triode emission pole tension, then testing circuit triode ON, amplifying circuit produces electric current.
Described adjustable constant flow source circuit is used for producing adjustable constant-flow electric current, and the described adjustable constant-flow function of current is in additional audio device amplifying circuit, in order to ensure stablizing of additional audio amplifier circuit colelctor electrode output stage electric current.
Wherein, described testing circuit is connected with described amplifying circuit end, and described amplifying circuit is connected with described adjustable constant flow source circuit.
Embodiment 1
As shown in Figure 4 and Figure 5, described testing circuit includes pair of diodes D1, D2 and detection PNP triode T1 one group symmetrical and detection NPN audion T2, the negative pole of described diode D1 is connected with the base stage of described PNP triode T1, and the positive pole of described diode D2 is connected with the base stage of NPN audion T2.
Described amplifying circuit then includes amplification NPN audion T3 and the amplification PNP triode T4 with amplified current function a pair, additionally series resistance R3, R4 between the emitter stage of amplifying triode T3, the T4 in described amplifying circuit, described R7, T3, R3, R4, T4 and R8 are sequentially connected in series, and the resistance of R7, R8 is equal simultaneously.
Described adjustable constant flow source circuit is made up of constant-current source PNP triode T5 one group symmetrical and constant-current source NPN audion T6.
The colelctor electrode of described detection PNP triode T1 is connected with the described ground level amplifying NPN audion T3, described detection NPN audion T2 colelctor electrode be connected with the ground level of described amplification PNP triode T4, the emitter stage of described constant-current source PNP triode T5 and constant-current source NPN audion T6 and base stage two ends equal with resistance respectively resistance R7 and R8 parallel connection.
So, reference voltage V F+ and VF-produced by D1 and D2 is connected on T1 and T2 base stage respectively and compares detection with T1 and T2 emitter voltage Ve+ and Ve-, utilization is opened diode forward C-V characteristic voltage VF and is realized comparing detection with transistor base and emitter junction voltage Vbe voltage difference, it may be assumed that VF-Vbe=Ve.
Amplifying triode T3 and T4 electric current paraphase are amplified, T3 and T4 collector load resistor R7 and R8 produces tabilized current power supply reference voltage Vc+ and Vc-respectively, R7 and R8 resistance is equal, obtain tabilized current power supply reference voltage Vc+ and Vc-equal, reference voltage Vc+ and Vc-drives tabilized current power supply T5 and T6 respectively, obtains described tabilized current power supply T5 and T6 electric current is equal.
Fig. 5 circuit can be applied with the collocation of Figure 10 circuit, and concrete application can analogy the detailed description with reference to embodiment 3.
Embodiment 2
As shown in Figure 6 and Figure 7, the present embodiment and embodiment 1 are different in that: described testing circuit includes an a diode D and detection transistor T1 for detecting, and the base stage of described diode D and described detection transistor T1 is connected；Described amplifying circuit includes an amplifying triode T3, described adjustable constant flow source circuit is made up of constant-current source PNP triode T5 one group symmetrical and constant-current source NPN audion T6, and the base stage of described constant-current source PNP triode T5 and constant-current source NPN audion T6 is connected with potentiometer R7 and R8 two groups equivalent respectively.
Described amplifying circuit is connected with described adjustable constant flow source circuit by a photoelectrical coupler OC.
The concrete annexation of each circuit is: the colelctor electrode of described detection transistor T1 is connected with the base stage of described amplifying triode T3, the emitter stage of described amplifying triode T3 by R3 and photoelectrical coupler OC respectively with the potentiometer R5 of described constant-current source PNP triode T5 and constant-current source NPN audion T6 base stage, R7 and R6, R8 are connected in series.
As it is shown in fig. 7, described diode D is connected on the base stage of audion T1.The reference voltage V F that diode D produces compares detection with audion T1 emitter voltage Ve+, T3 Current amplifier, drive photoelectrical coupler OC luminous source, photoelectrical coupler OC outfan respectively with potentiometer R5, R7 and potentiometer R6, R8 connects, and sets up tabilized current power supply reference voltage Vc+ and Vc-, drives T5 and T6 tabilized current power supply.
Fig. 7 circuit can be applied with the collocation of Figure 10 circuit, and concrete application can analogy the detailed description with reference to embodiment 3.
Embodiment 3
As shown in Figure 8 and Figure 9, the present embodiment is combination and the extension of embodiment 1 and embodiment 2, wherein said testing circuit adopts pair of diodes D1, D2 and detection PNP triode T1 one group symmetrical and detection NPN audion T2, the negative pole of described diode D1 is connected with the base stage of described detection PNP triode T1, the positive pole of diode D2 is connected with the base stage of described detection NPN audion T2
Accordingly, described amplifying circuit includes one and amplifies a NPN audion T3 and amplification PNP triode T4, described tabilized current power supply is made up of a constant-current source PNP triode T5 and a constant-current source NPN audion T6, and the base stage of described constant-current source PNP triode T5 and constant-current source NPN audion T6 is connected with two groups equivalent potentiometer R7, R5 and R6, R8 respectively.
Annexation is: the colelctor electrode of described detection PNP triode T1 is connected with the described ground level amplifying NPN audion T3, the colelctor electrode of described detection NPN audion T2 is connected with the base stage of described amplification PNP triode T4, and the described emitter stage amplifying NPN audion T2 and amplification PNP triode T4 is connected in series with described constant-current source PNP triode T5 and potentiometer R7, R5 and R6 of base stage of constant-current source NPN audion T6, R8 respectively by R3 and R4. photoelectrical coupler OC
Transfer characteristic due to photoelectrical coupler electric light electricity, it is possible to make to compare the electrical isolation that detection current amplification circuit has generation good with tabilized current power supply,
Specifically, reference voltage V F+ produced by D1 is connected on T1 base stage and compares detection with T1 emitter voltage Ve+, and reference voltage V F-produced by D2 is connected on T2 base stage and compares detection with T2 emitter voltage Ve-；T3 and T4 is one group of symmetrical and opposite polarity amplifying circuit, described amplifying circuit drives a photo-coupler OC luminous source, photo-coupler OC outfan respectively with potentiometer R5, R7 potentiometer and R6, R8 connects, obtain tabilized current power supply reference voltage Vc+ and Vc-, described tabilized current power supply reference voltage Vc+ and Vc-and drive tabilized current power supply T5 and T6.
T1 and T2 ratio of components relatively testing circuit, is utilize switching mode silicon diode forward C-V characteristic VF to realize comparing detection with transistor base and emitter junction voltage Vbe voltage difference, namely: VF-Vbe=Ve.
Learning according to handbook and experimental demonstration, most of silicon diode forward C-V characteristic voltage VF are higher than the Vbe voltage of small-power silicon triode.
For Fig. 8 and Fig. 9. the specific works process of the present invention is as follows:
When Ve+ and Ve-voltage is 0, T1 and T2 turns on, and T3 and T4 turns on, and electric current passes through current-limiting resistance R3 and R4, drive photoelectrical coupler OC luminous source, photoelectrical coupler OC outfan internal resistance minimizing, potentiometer R5, R7 and potentiometer R6, R8 produces electric current, set up tabilized current power supply reference voltage Vc+ and Vc-, tabilized current power supply T5 and T6 to start, circuit start.
When Ve+ and Ve-voltage rises, then T1 and T2 electric current reduces the minimizing of T3 and T4 circuit current, and photoelectric coupler output end internal resistance increases, and tabilized current power supply Vc+ and Vc-reference voltage decline, and tabilized current power supply T5 and T6 electric current reduce.
During when the voltage of Ve+ and Ve-voltage and T1 and T2 base stage and emitter junction voltage Vbe with lower than D1 and D2 forward C-V characteristic voltage VF+ and VF-, then T1 and T2 electric current rises, and tabilized current power supply T5 and T6 electric current rise.
During when the voltage of Ve+ and Ve-voltage and T1 and T2 base stage and emitter junction voltage Vbe with higher than D1 and D2 forward C-V characteristic voltage VF+ and VF-, then T1 and T2 electric current reduces.Tabilized current power supply T5 and T6 electric current reduce.
The sense of current of all of accompanying drawing circuit difference represents that with transistor emitter arrow in accompanying drawing direction keeps consistent.
The concrete condition of accompanying drawing 10 circuit it is applied to the following detailed description of accompanying drawing 9 circuit.
Accompanying drawing 9 is applied on holohedral symmetry complementary differential amplifying circuit accompanying drawing 10 circuit eliminating emitter-base bandgap grading output stage, and wherein, Ve+ and the Ve-in Figure 10 circuit is corresponding with Ve+ and Ve-of Fig. 9 circuit respectively to be connected；Ie+ and Ie-in Figure 10 circuit is corresponding with Ie+ and Ie-of Fig. 9 circuit respectively to be connected；B+, B-, b+, b-in Figure 10 circuit is corresponding with B+, B-, b+, b-of Fig. 9 circuit respectively to be connected.
The work process that Fig. 9 circuit coordinates with Figure 10 circuit is as follows:
Process (1): in Figure 10 circuit, power amplification pole T10 and T11 electric current rise, then reflection rises to T10 and T11 emitter stage feedback resistance Re+ and Re-voltage drop, and reflection rises to Ve+ and Ve-voltage, Ve+ and Ve-voltage in respective figure 9 circuit rises, subsequently into process (2).
Process (2): as previously mentioned, in Fig. 9 circuit, Ve+ and Ve-voltage rises, when Ve+ and Ve-voltage and T1 and T2 base stage and emitter junction voltage Vbe's and during higher than D1 and D2 forward C-V characteristic voltage VF+ and VF-, T1 and T2 electric current reduces, T3 and T4 electric current reduces, tabilized current power supply T5 and T6 electric current reduce, then to Figure 10 circuit differential amplifier circuit T7a and T8a electric current should be had to reduce, T7a and T8a collector load resistor Rc+ and Rc-voltage drop decline, power-amplifier stage bias voltage Vb+ and Vb-voltage decline, power-amplifier stage T10 and T11 operating current reduce, Ve+ and Ve-voltage declines, and Ve+ and Ve-voltage declines in Figure 10, then Ve+ and the Ve-voltage in respective figure 9 circuit declines accordingly.
Process (3): at Fig. 9 circuit, when Ve+ and Ve-voltage declines, Ve+ and Ve-voltage and T1 and T2 base stage and emitter junction voltage be Vbe's and during lower than D1 and D2 forward C-V characteristic voltage VF+ and VF-, T1 and T2 electric current rises, T3 and T4 electric current rises, tabilized current power supply T5 and T6 electric current rise, Figure 10 circuit differential amplifier circuit T7a and T8a electric current is then had to rise, T7a and T8a collector load resistor RC+ and RC-voltage drop rise, T10 and T11 bias voltage Vb+ and Vb-voltage rise, power amplification pole T10 and T11 electric current rise, Ve+ and Ve-voltage rises, and Ve+ and Ve-voltage rises in Figure 10, then Ve+ and the Ve-voltage in respective figure 9 circuit should have rising mutually.
And Ve+ and Ve-voltage rises in accompanying drawing 9, then jump to again process (2), then being repeatedly performed in process (2) and process (3), finally the maximum of stable T10 and T11 operating current design load in Fig. 10, T10 and T11 bias voltage Vb+ and the Vb-in Figure 10 remains stable for.
Because identical with transistor audio-frequency amplifier circuit on pre-amplification circuit power amplification circuit electrical principle, therefore the present invention can be extended in pre-amplification circuit.
The testing circuit of the present invention provides reference voltage. compare detection, Current amplifier enters adjustable constant flow source circuit and produces adjustable constant-flow electric current thus controlling amplifying circuit output stage operating current and remaining stable for, cancel emitter-base bandgap grading output and achieve stablizing of amplifier colelctor electrode output, eliminate the interference to transistor audio-frequency amplifier output stage of the speaker anti-EMF voltage, there is very big market prospect.
Additionally, when the present invention is applied in asymmetric circuit, only need to one of them constant-current source of the adjustable constant flow source circuit of this adjunct circuit be linked in asymmetric audio amplifier circuit application circuit, the equally possible stable output reaching asymmetric audio amplifier circuit realizes colelctor electrode, eliminates the interference to transistor audio-frequency amplifier output stage of the speaker anti-EMF voltage.
As described above, it is only presently preferred embodiments of the present invention, when not limiting scope of the invention process with this, the simple equivalence namely generally made according to the present patent application the scope of the claims and utility model description changes and modifies, and all still remains within the scope of the patent.
Claims (9)
1. the audio frequency amplifier adjunct circuit being applied to cancel emitter-base bandgap grading output stage, including testing circuit, amplifying circuit and adjustable constant flow source circuit, it is characterized in that, described testing circuit includes diode and audion, described diode is connected with the base stage of described audion, is used for producing forward C-V characteristic voltage；The emitter stage of described audion is connected with sample circuit, and colelctor electrode is connected with amplifying circuit；
The forward C-V characteristic voltage that described testing circuit is produced by described diode, as reference voltage, compares detection for the voltage difference with triode emission pole tension；
Described amplifying circuit is used for amplified current signal；
Described adjustable constant flow source circuit is used for producing adjustable constant-flow electric current；
Described testing circuit is connected with described amplifying circuit, and described amplifying circuit is connected with described adjustable constant flow source circuit.
2. as claimed in claim 1 a kind of be applied to cancel emitter-base bandgap grading output stage audio frequency amplifier adjunct circuit, it is characterized in that, described testing circuit includes a diode and a detection transistor, described diode is connected with the base stage of described detection transistor, for producing forward C-V characteristic voltage, the colelctor electrode of described detection transistor is connected with described amplifying circuit, and the emitter stage of described detection transistor is connected with sample circuit.
3. as claimed in claim 1 a kind of be applied to cancel emitter-base bandgap grading output stage audio frequency amplifier adjunct circuit, it is characterized in that, described testing circuit includes the first relative a pair diode and the second diode and detection PNP triode one group symmetrical and detection NPN audion, the negative pole of described first diode is connected with the base stage of described detection PNP triode, for producing forward C-V characteristic voltage, the positive pole of described second diode is connected with the base stage of described detection NPN audion, for producing forward C-V characteristic voltage, the colelctor electrode of described detection PNP triode and detection NPN audion is connected with described amplifying circuit, the emitter stage of described detection PNP triode and detection NPN audion is connected with sample circuit.
4. as claimed in claim 2 a kind of be applied to cancel emitter-base bandgap grading output stage audio frequency amplifier adjunct circuit, it is characterised in that described amplifying circuit includes an amplifying triode；Described adjustable constant flow source circuit is made up of a constant-current source PNP triode and a constant-current source NPN audion, and the base stage of described constant-current source PNP triode and constant-current source NPN audion is connected with potentiometer two groups equivalent respectively；The colelctor electrode of described detection transistor is connected with the base stage of described amplifying triode, the emitter stage of described amplifying triode is connected in series with the potentiometer of described constant-current source PNP triode and constant-current source NPN transistor base respectively by photoelectrical coupler, and the colelctor electrode of described amplifying triode is connected with power supply.
5. as claimed in claim 3 a kind of be applied to cancel emitter-base bandgap grading output stage audio frequency amplifier adjunct circuit, it is characterized in that, described amplifying circuit includes amplification NPN audion one group symmetrical and amplifies PNP triode, described adjustable constant flow source circuit is made up of constant-current source PNP triode one group symmetrical and constant-current source NPN audion, and described constant-current source PNP triode and constant-current source NPN transistor base are connected with potentiometer two groups equivalent respectively；The colelctor electrode of described detection PNP triode is connected with the described base stage amplifying NPN audion, the colelctor electrode of described detection NPN audion is connected with the base stage of described amplification PNP triode, the described emitter stage amplifying NPN audion and amplification PNP triode is connected in series with the potentiometer of described constant-current source PNP triode and constant-current source NPN transistor base respectively by photoelectrical coupler, and the described NPN audion that amplifies is connected with power supply respectively with the colelctor electrode amplifying PNP triode.
6. a kind of audio frequency amplifier adjunct circuit being applied to cancel emitter-base bandgap grading output stage as described in claim 4 or 5, it is characterised in that potentiometer is the potentiometer of resistance composition.
7. as claimed in claim 3 a kind of be applied to cancel emitter-base bandgap grading output stage audio frequency amplifier adjunct circuit, it is characterized in that, described amplifying circuit includes amplification NPN audion one group symmetrical and amplifies PNP triode, and described adjustable constant flow source circuit is made up of constant-current source PNP triode one group symmetrical and constant-current source NPN audion；The colelctor electrode of described detection PNP triode is connected with the described base stage amplifying NPN audion, the colelctor electrode of described detection NPN audion is connected with the base stage of described amplification PNP triode, the emitter stage of described constant-current source PNP triode and constant-current source NPN audion and base stage two ends are parallel with the first equal resistance of resistance and the second resistance respectively, described first resistance and the second resistance are connected with described amplification NPN audion and amplification PNP triode respectively, and described first resistance and the second resistance are connected to and described amplify NPN audion and amplify on the colelctor electrode of PNP triode.
8. as claimed in claim 7 a kind of be applied to cancel emitter-base bandgap grading output stage audio frequency amplifier adjunct circuit, it is characterized in that, being in series with series resistance between described amplification NPN audion and amplification PNP triode, described first resistance, amplification NPN audion, series resistance, amplification PNP triode and the second resistance are sequentially connected in series.
9. as claimed in claim 1 a kind of be applied to cancel emitter-base bandgap grading output stage audio frequency amplifier adjunct circuit, it is characterised in that the diode switching mode diode of described testing circuit.
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| CN103762550A (en) * | 2014-01-24 | 2014-04-30 | 苏州融达兴电气有限公司 | Intelligent low-voltage measuring and controlling circuit structure of three-phase busbar |
| JPWO2017145241A1 (en) * | 2016-02-22 | 2018-09-27 | 健 赤石 | Amplifier output circuit |
| JP6904179B2 (en) * | 2017-09-06 | 2021-07-14 | ヤマハ株式会社 | Amplifiers, audio equipment and control methods |
| WO2023155832A1 (en) * | 2022-02-17 | 2023-08-24 | 郭桥石 | Power supply circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2540065Y (en) * | 2001-07-21 | 2003-03-12 | 李向前 | Photoelectric coupling automatic constant-current offset power amplifier |
| CN200973071Y (en) * | 2006-06-09 | 2007-11-07 | 杨武 | Audio power amplifier circuit |
| CN203423795U (en) * | 2013-09-09 | 2014-02-05 | 胡福生 | Additional circuit of audio frequency amplifier applied for eliminating emitter output stage |
-
2013
- 2013-09-09 CN CN201310408047.7A patent/CN103458341B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2540065Y (en) * | 2001-07-21 | 2003-03-12 | 李向前 | Photoelectric coupling automatic constant-current offset power amplifier |
| CN200973071Y (en) * | 2006-06-09 | 2007-11-07 | 杨武 | Audio power amplifier circuit |
| CN203423795U (en) * | 2013-09-09 | 2014-02-05 | 胡福生 | Additional circuit of audio frequency amplifier applied for eliminating emitter output stage |
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| Publication number | Publication date |
|---|---|
| CN103458341A (en) | 2013-12-18 |
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