CN105375884A - Loudspeaker box power amplification circuit - Google Patents
Loudspeaker box power amplification circuit Download PDFInfo
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- CN105375884A CN105375884A CN201510822306.XA CN201510822306A CN105375884A CN 105375884 A CN105375884 A CN 105375884A CN 201510822306 A CN201510822306 A CN 201510822306A CN 105375884 A CN105375884 A CN 105375884A
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Abstract
The invention provides a loudspeaker box power amplification circuit, and belongs to the technical field of loudspeaker box power amplification. The loudspeaker box power amplification circuit has the advantages that the cost is low, the transmitted signals are not easy to distort, and the power can be amplified at multiple levels. The power amplification circuit comprises a signal input module, a voltage amplification module, an over-current protection module, a current amplification module, a signal output module and an over-load reminding module. The main components of the power amplification circuit are triodes; the conducting voltage of each triode at a low frequency band is relatively low, so that generated crossover distortion can be decreased to the lowest; and the triodes used in the current are easier to match, so that the circuit cost is reduced.
Description
Technical field
The invention belongs to audio amplifier power amplifier technology field, relate to a kind of speaker power amplifier circuit.
Background technology
Power amplifier in audio amplifier be generally used for by microphone or other equipment transmit come signal amplify, then played sound by equipment such as loudspeaker.Because the signal transmitted is the signal of telecommunication that sound is transformed, so prevent distorted signals very important.In the power amplifier of the audio amplifier used now, most use is the main element of use metal-oxide-semiconductor as power amplifier more.And be that the power amplifier of main element needs more safeguard measure with metal-oxide-semiconductor, metal-oxide-semiconductor is easy to when input and output are transshipped damaged.And the cut-in voltage of metal-oxide-semiconductor is very high, and the transmission of signal of metal-oxide-semiconductor easily produces intermodulation distortion at low frequency, causes voice signal to be converted to when sound is play and does not reach expected effect.
In sum, for solving the deficiency in existing speaker power amplifier circuit function, need to design a kind of cost low, signal transmission not easily distortion, can the speaker power amplifier circuit of multistage amplifying power.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose a kind of cost low, signal transmission not easily distortion, can the speaker power amplifier circuit of multistage amplifying power.
Object of the present invention realizes by following technical proposal: a kind of speaker power amplifier circuit, comprises signal input module, also comprises voltage amplification module, connects signal input module, amplifies for signal signal input module inputted; Overcurrent protection module, connects voltage amplification module, for the protection of circuit, prevents overcurrent from causing damage to circuit; Current amplifier module, connects overcurrent protection module, by the power amplification in circuit, to drive external speaker equipment; Signal output module, connects Current amplifier module, for output signal; Overload reminding module, connects Current amplifier module and signal output module, sends prompting for during circuit overloads.
According to above-mentioned a kind of speaker power amplifier circuit, described signal input module comprises the first signal input part to the 3rd signal input part, first resistance is to the 8th resistance, first electric capacity is to the 4th electric capacity, first diode, the second diode, the first operational amplifier, described first signal input part comprises the first signal input interface, secondary signal input interface; Described secondary signal input comprises the 3rd signal input interface, the 4th signal input interface; Described 3rd signal input part comprises the 5th signal input interface, the 6th signal input interface; The output of described first operational amplifier connects voltage amplification module after the 8th resistance; First signal input interface of described first signal input part is through the first electric capacity, the inverting input of the first operational amplifier is connected after second resistance, and the first signal input interface of the first signal input part ground connection after the first parallel circuits that the first resistance and the second electric capacity are formed, the secondary signal input interface also ground connection of the first signal input part; The normal phase input end of described first operational amplifier through the 3rd resistance, the 3rd electric capacity, ground connection after the 4th resistance; The normal phase input end of described first operational amplifier, successively through the 3rd resistance, connects the 5th signal input interface of the 3rd signal input part after the second parallel circuits that the 4th electric capacity and the 5th resistance are formed and the 6th resistance; Described 6th signal input interface, successively through the anode of the first diode, connects the 5th signal input interface after negative electrode, and the 6th signal input interface ground connection; One end that described second parallel circuits is connected with the 6th resistance connects the 3rd signal input interface after the 7th resistance, and the anode of described 4th signal input interface second diode, connects the 3rd signal input interface after negative electrode, and the 4th signal input interface ground connection.
According to above-mentioned a kind of speaker power amplifier circuit, described voltage amplification module comprises the first triode to the 3rd triode, and the 9th resistance is to the 18 resistance, and the 5th electric capacity is to the 9th electric capacity; The base stage of described first triode, through the 5th electric capacity, connects the output of the first operational amplifier after the 8th resistance, the emitter of the first triode is successively through the 15 resistance, and the 9th resistance, connects the output of the first operational amplifier after the tenth resistance and the 8th resistance; The base stage of described 3rd triode is through the 6th electric capacity, the output of the first operational amplifier is connected after 8th resistance, the emitter of described 3rd triode is successively through the 16 resistance, and the 12 resistance, connects the output of the first operational amplifier after the 11 resistance and the 8th resistance; The emitter of described first triode connects cathode power supply after the 15 resistance, the described base stage of 7th Capacitance parallel connection in the first triode and the two ends of collector electrode, the collector electrode of the first triode connects overcurrent protection module after the 17 resistance, and the collector electrode of the first triode connects the collector electrode of the second triode; The emitter of described second triode connects the collector electrode of the 3rd triode, the collector electrode of the 3rd triode also connects overcurrent protection module after ground 18 resistance, the emitter of described 3rd triode connects negative power supply through the 16 resistance, and described 8th Capacitance parallel connection is in the two ends of the 3rd transistor base and emitter; Described 13 resistor coupled in parallel is in the two ends of the second transistor base and collector electrode, and the described base stage of 14 resistor coupled in parallel in the second triode and the two ends of emitter, described 9th Capacitance parallel connection is in the two ends of the collector and emitter of the second triode.
According to above-mentioned a kind of speaker power amplifier circuit, described overcurrent protection module comprises the 19 resistance to the 22 resistance, tenth electric capacity is to the 13 electric capacity, 4th triode, 5th triode, 3rd diode is to the 6th diode, the collector electrode of described 4th triode is successively through the negative electrode of the 3rd diode, the anode of the 3rd diode, cathode power supply is connect after 12 electric capacity, and the collector electrode of the 4th triode connects Current amplifier module after the 3rd diode, the base stage of described 4th triode is successively through the 19 resistance, the anode of the 5th diode, ground connection after the negative electrode of the 5th diode, and the base stage of the 4th triode connects Current amplifier module, the collector electrode of described 5th triode is successively through the anode of the 4th diode, the negative electrode of the 3rd diode, negative power supply is connect after 13 electric capacity, and the collector electrode of the 5th triode connects Current amplifier module after the 4th diode, the base stage of described 5th triode is successively through the 22 resistance, the negative electrode of the 6th diode, ground connection after the anode of the 6th diode, and the 5th triode base stage connect Current amplifier module, the base stage of described 4th triode is through the 20 resistance, the base stage of the 5th triode is connected after 21 resistance, the emitter of described 4th triode connect the 5th triode emitter, and the emitter of the 4th triode and the 5th triode emitter be all connected with signal output module with Current amplifier module, the base stage of described tenth Capacitance parallel connection in the 4th triode and the two ends of collector electrode, the base stage of described 11 Capacitance parallel connection in the 5th triode and the two ends of collector electrode.
According to above-mentioned a kind of speaker power amplifier circuit, described Current amplifier module comprises the 23 resistance to the 30 resistance, and the 6th triode is to the 9th triode, and the collector electrode of described 6th triode and the collector electrode of the 7th triode all connect overcurrent protection module, the collector electrode of described 6th triode connects cathode power supply, the emitter of the 6th triode connects the base stage of the 8th triode after the 25 resistance, and the emitter of the 6th triode is through the 23 resistance, the emitter of the 7th triode is connected after 24 resistance, the emitter of described 7th triode connects the base stage of the 9th triode after the 26 resistance, the emitter of the 9th triode is through the 30 resistance, the 8th transistor emitter is connected after 29 resistance, the collector electrode of described 8th triode connects cathode power supply, the collector electrode of described 9th triode connects negative power supply, the emitter of described 8th triode connects overcurrent protection module after the 27 resistance, and the emitter of described 9th triode connects overcurrent protection module after the 28 resistance.
According to above-mentioned a kind of speaker power amplifier circuit, described signal output module comprises the 31 resistance to the 33 resistance, 14 electric capacity is to the 16 electric capacity, first coil, high pitched signal cathode output end, high pitched signal cathode output end, bass signal cathode output end, bass signal cathode output end, the 3rd parallel circuits that described high pitched signal cathode output end is formed through the 33 resistance and the 16 electric capacity, signal input module is connected after 15 electric capacity and the 31 resistance, and high pitched signal cathode output end connects high pitched signal cathode output end after the 3rd parallel circuits and the first coil, described high pitched signal cathode output end ground connection, and high pitched signal cathode output end connects bass signal cathode output end, described bass signal cathode output end is through the 32 resistance, ground connection after 14 electric capacity, described bass signal cathode output end connects signal input module, and bass signal cathode output end connects Current amplifier module respectively, overcurrent protection module and overload reminding module.
According to above-mentioned a kind of speaker power amplifier circuit, described overcurrent protection module comprises the 34 resistance to the 38 resistance, 17 electric capacity, 7th diode, tenth triode, overload signal output, described overload signal output comprises the first overload signal output interface, the second overload signal output interface, described bass signal cathode output end is successively through the negative electrode of the 7th diode, the anode of the 7th diode, 34 resistance, the base stage of the tenth triode is connected after 37 resistance, and the base stage of the tenth triode is through the 37 resistance, ground connection after 35 resistance, the base stage of described tenth triode also connects negative power supply after the 38 resistance, collector electrode ground connection after the 36 resistance of described tenth triode, and the collector electrode of the tenth triode connects the first overload signal output interface, the emitter of described tenth triode connects negative power supply, one end ground connection after the 35 resistance of described 17 electric capacity, another termination negative power supply, described second overload signal output interface connects negative power supply.
Compared with prior art, the present invention has the following advantages:
1. substitute metal-oxide-semiconductor with triode, reduce cost, not easily damage when circuit overloads simultaneously, the cost of circuit is reduced and stability is better.
2. better than metal-oxide-semiconductor in the stability of low-frequency range triode, the distortion that the transmission of signal is produced is less.
3. circuit comprises voltage amplification module, the module of Current amplifier, by the mode of multistage amplification, improves the efficiency of power amplifier.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of speaker power amplifier circuit.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, the present invention includes signal input module, also comprise voltage amplification module, connect signal input module, amplify for the signal that signal input module is inputted; Overcurrent protection module, connects voltage amplification module, for the protection of circuit, prevents overcurrent from causing damage to circuit;
Current amplifier module, connects overcurrent protection module, by the power amplification in circuit, to drive external speaker equipment; Signal output module, connects Current amplifier module, for output signal; Overload reminding module, connects Current amplifier module and signal output module, sends prompting for during circuit overloads.
According to above-mentioned a kind of speaker power amplifier circuit, described signal input module comprises the first signal input part T1 to the 3rd signal input part T3, first resistance R1 is to the 8th resistance R8, first electric capacity C1 is to the 4th electric capacity C4, first diode, the second diode, the first operational amplifier U1, described first signal input part T1 comprises the first signal input interface, secondary signal input interface; Described secondary signal input T2 comprises the 3rd signal input interface, the 4th signal input interface; Described 3rd signal input part T3 comprises the 5th signal input interface, the 6th signal input interface; The output of described first operational amplifier U1 connects voltage amplification module after the 8th resistance R8; First signal input interface of described first signal input part T1 is through the first electric capacity C1, the inverting input of the first operational amplifier U1 is connected after second resistance R2, and first signal input interface of the first signal input part T1 ground connection after the first parallel circuits that the first resistance R1 and the second electric capacity C2 is formed, the secondary signal input interface also ground connection of the first signal input part T1; The normal phase input end of described first operational amplifier through the 3rd resistance R3, the 3rd electric capacity C3, ground connection after the 4th resistance R4; The normal phase input end of described first operational amplifier, successively through the 3rd resistance R3, connects the 5th signal input interface of the 3rd signal input part T3 after the second parallel circuits that the 4th electric capacity C4 and the 5th resistance R5 is formed and the 6th resistance R6; Described 6th signal input interface, successively through the anode of the first diode D1, connects the 5th signal input interface after negative electrode, and the 6th signal input interface ground connection; One end that described second parallel circuits is connected with the 6th resistance R6 connects the 3rd signal input interface after the 7th resistance R7, the anode of a described 4th signal input interface second diode D2, the 3rd signal input interface is connected after negative electrode, and the 4th signal input interface ground connection.
According to above-mentioned a kind of speaker power amplifier circuit, described voltage amplification module comprises the first triode Q1 to the 3rd triode Q3, and the 9th resistance R9 is to the 18 resistance R18, and the 5th electric capacity C5 is to the 9th electric capacity C9; The base stage of described first triode Q1 is through the 5th electric capacity C5, the output of the first operational amplifier U1 is connected after 8th resistance R8, the emitter of the first triode Q1 is successively through the 15 resistance R15, the output of the first operational amplifier U1 is connected after 9th resistance R9, the tenth resistance R10 and the 8th resistance R8; The base stage of described 3rd triode Q3 is through the 6th electric capacity C6, the output of the first operational amplifier U1 is connected after 8th resistance R8, the emitter of described 3rd triode Q3 is successively through the 16 resistance R16, the output of the first operational amplifier U1 is connected after 12 resistance R12, the 11 resistance R11 and the 8th resistance R8; The emitter of described first triode Q1 connects cathode power supply after the 15 resistance R15, described 7th electric capacity C7 is parallel to the base stage of the first triode Q1 and the two ends of collector electrode, the collector electrode of the first triode Q1 connects overcurrent protection module after the 17 resistance R17, and the collector electrode of the first triode Q1 connects the collector electrode of the second triode Q2; The emitter of described second triode Q2 connects the collector electrode of the 3rd triode Q3, the collector electrode of the 3rd triode Q3 also connects overcurrent protection module after ground 18 resistance R18, the emitter of described 3rd triode Q3 connects negative power supply through the 16 resistance R16, and described 8th electric capacity C8 is parallel to the two ends of the 3rd triode Q3 base stage and emitter; Described 13 resistance R13 is parallel to the two ends of the second triode Q2 base stage and collector electrode, described 14 resistance R14 is parallel to the base stage of the second triode Q2 and the two ends of emitter, and described 9th electric capacity C9 is parallel to the two ends of the collector and emitter of the second triode Q2.
According to above-mentioned a kind of speaker power amplifier circuit, described overcurrent protection module comprises the 19 resistance R19 to the 22 resistance R22, tenth electric capacity C10 is to the 13 electric capacity C13, 4th triode Q4, 5th triode Q5, 3rd diode D3 is to the 6th diode D6, the collector electrode of described 4th triode Q4 is successively through the negative electrode of the 3rd diode D3, the anode of the 3rd diode D3, cathode power supply is connect after 12 electric capacity C12, and the collector electrode of the 4th triode Q4 connects Current amplifier module after the 3rd diode D3, the base stage of described 4th triode Q4 is successively through the 19 resistance R19, the anode of the 5th diode D5, ground connection after the negative electrode of the 5th diode D5, and the base stage of the 4th triode Q4 connects Current amplifier module, the collector electrode of described 5th triode Q5 is successively through the anode of the 4th diode D4, the negative electrode of the 3rd diode D3, negative power supply is connect after 13 electric capacity C13, and the collector electrode of the 5th triode Q5 connects Current amplifier module after the 4th diode D4, the base stage of described 5th triode Q5 is successively through the 22 resistance R22, the negative electrode of the 6th diode D6, ground connection after the anode of the 6th diode D6, and the 5th triode Q5 base stage connect Current amplifier module, the base stage of described 4th triode Q4 is through the 20 resistance R20, the base stage of the 5th triode Q5 is connected after 21 resistance R21, the emitter of described 4th triode Q4 connect the 5th triode Q5 emitter, and the emitter of the 4th triode Q4 and the 5th triode Q5 emitter be all connected with signal output module with Current amplifier module, described tenth electric capacity C10 is parallel to the base stage of the 4th triode Q4 and the two ends of collector electrode, and described 11 electric capacity C11 is parallel to the base stage of the 5th triode Q5 and the two ends of collector electrode.
According to above-mentioned a kind of speaker power amplifier circuit, described Current amplifier module comprises the 23 resistance R23 to the 30 resistance R30,6th triode Q6 is to the 9th triode Q9, and the collector electrode of described 6th triode Q6 and the collector electrode of the 7th triode Q7 all connect overcurrent protection module, the collector electrode of described 6th triode Q6 connects cathode power supply, the emitter of the 6th triode Q6 connects the base stage of the 8th triode Q8 after the 25 resistance R25, and the emitter of the 6th triode Q6 is through the 23 resistance R23, the emitter of the 7th triode Q7 is connected after 24 resistance R24, the emitter of described 7th triode Q7 connects the base stage of the 9th triode Q9 after the 26 resistance R26, the emitter of the 9th triode Q9 is through the 30 resistance R30, the 8th triode Q8 emitter is connected after 29 resistance R29, the collector electrode of described 8th triode Q8 connects cathode power supply, the collector electrode of described 9th triode Q9 connects negative power supply, the emitter of described 8th triode Q8 connects overcurrent protection module after the 27 resistance R27, and the emitter of described 9th triode Q9 connects overcurrent protection module after the 28 resistance R28.
According to above-mentioned a kind of speaker power amplifier circuit, described signal output module comprises the 31 resistance R31 to the 33 resistance R33, 14 electric capacity C14 is to the 16 electric capacity C16, first coil L1, high pitched signal cathode output end H+, high pitched signal cathode output end H-, bass signal cathode output end L+, bass signal cathode output end L-, the 3rd parallel circuits that described high pitched signal cathode output end H+ is formed through the 33 resistance R33 and the 16 electric capacity C16, signal input module is connected after 15 electric capacity C15 and the 31 resistance R31, and high pitched signal cathode output end H+ connects high pitched signal cathode output end H-after the 3rd parallel circuits and the first coil L1, described high pitched signal cathode output end H-ground connection, and high pitched signal cathode output end H-connects bass signal cathode output end L-, described bass signal cathode output end L+ is through the 32 resistance R32, ground connection after 14 electric capacity C14, described bass signal cathode output end L+ connects signal input module, and bass signal cathode output end L+ connects Current amplifier module respectively, overcurrent protection module and overload reminding module.
According to above-mentioned a kind of speaker power amplifier circuit, described overcurrent protection module comprises the 34 resistance R34 to the 38 resistance R38,17 electric capacity C17,7th diode D7, tenth triode Q10, overload signal output P1, described overload signal output P1 comprises the first overload signal output interface, the second overload signal output interface, described bass signal cathode output end L+ is successively through the negative electrode of the 7th diode D7, the anode of the 7th diode D7, 34 resistance R34, the base stage of the tenth triode Q10 is connected after 37 resistance R37, and the base stage of the tenth triode Q10 is through the 37 resistance R37, ground connection after 35 resistance R35, the base stage of described tenth triode Q10 also connects negative power supply after the 38 resistance R38, collector electrode ground connection after the 36 resistance R36 of described tenth triode Q10, and the collector electrode of the tenth triode Q10 connects the first overload signal output interface, the emitter of described tenth triode Q10 connects negative power supply, one end ground connection after the 35 resistance R35 of described 17 electric capacity C17, another termination negative power supply, described second overload signal output interface connects negative power supply.
Signal inputs to speaker power amplifier circuit through the first signal input part T1, secondary signal input T2, the 3rd signal input part T3 respectively, and the first operational amplifier U1 act as differential amplifier.When signal is through the normal phase input end of the first operational amplifier U1 and inverting input input, the interference signal in signal can be eliminated.Signal exports to voltage amplification module after the first operational amplifier U1, and the first triode Q1 and the 3rd triode Q3 is common-base amplifier.Be the power amplification of signal in circuit required by power amplifier, be the efficiency improving power amplifier, need voltage and current all to amplify.Common-base amplifier only has voltage amplification effect; and there is current following effect, input resistance is little, so when signal is through the first triode Q1 and the 3rd triode Q3; voltage amplification, signal exports to overcurrent protection module respectively after the first triode Q1 and the 3rd triode Q3.Second triode Q3 act as voltage stabilizing, prevents that the signal voltage after voltage amplification is excessive causes damage to circuit.
Signal, after voltage amplification, exports to Current amplifier module, and described 6th triode Q6 is common-collector amplifier to the 9th triode Q9, all for Current amplifier.Signal successively through the base stage of the 6th triode Q3, the 6th triode Q3 emitter, after export to the 8th triode Q8, through the base stage of the 8th triode Q8, after the emitter of the 8th triode Q8, export to signal output module.In like manner, signal, successively through the base stage of the 7th triode Q7, exports to the 9th triode Q9 after the emitter of the 7th triode Q7, then through the base stage of the 9th triode Q9, exports to signal output module after the emitter of the 9th triode Q9.
Overcurrent protection module is connected with Current amplifier module, and its effect is when signal is after Current amplifier module is amplified, and prevents overcurrent from causing damage to circuit.When electric current in Current amplifier module is excessive, the electric current flowing into the 4th triode Q4 and the 5th triode Q5 increases, base stage and the emitter of the 4th triode Q4 and the 5th triode Q5 are all parallel with resistance, so when the current increases, the voltage of the base terminal of the 4th triode Q4 is much larger than the collector electrode of the 4th triode Q4,4th triode Q4 conducting, but due to collector electrode reversal connection one diode of the 4th triode Q4, thus diode be by state; The voltage of the base terminal of the 4th triode Q4 much larger than the collector electrode of the 4th triode Q4, again because the 5th triode Q5 is PNP type triode, now the 5th triode Q5 be by.
Signal is after Current amplifier module is amplified, and export to signal output module, this signal is through the 31 resistance R31, and the 15 electric capacity C15, is passed to high pitched signal cathode output end H+ after the 3rd parallel circuits.And the first coil L1 is charged, make high pitched signal cathode output end H+ and high pitched signal cathode output end H-produce voltage difference.In like manner, bass signal cathode output end L-ground connection, bass signal cathode output end L+ connects the signal after amplification, also there is voltage difference between two ends.
Acting as when circuit overloads of described overload reminding module, gives the alarm.When there is overload in circuit, in circuit, electric current is greater than the puncture voltage of the 7th diode D7, then the 7th diode D7 conducting, now the base terminal voltage of the tenth triode Q10 is greater than emitter voltage, tenth triode Q10 conducting, then voltage can be exported by overload signal output P1, can be used for controlling external warning device.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (7)
1. a speaker power amplifier circuit, comprises signal input module, it is characterized in that, comprising:
Voltage amplification module, connects signal input module, amplifies for signal signal input module inputted;
Overcurrent protection module, connects voltage amplification module, for the protection of circuit, prevents overcurrent from causing damage to circuit;
Current amplifier module, connects overcurrent protection module, by the power amplification in circuit, to drive external speaker equipment;
Signal output module, connects Current amplifier module, for output signal;
Overload reminding module, connects Current amplifier module and signal output module, sends prompting for during circuit overloads.
2. a kind of speaker power amplifier circuit according to claim 1, it is characterized in that, described signal input module comprises the first signal input part to the 3rd signal input part, first resistance to the 8th resistance, the first electric capacity to the 4th electric capacity, the first diode, second diode, first operational amplifier, described first signal input part comprises the first signal input interface, secondary signal input interface; Described secondary signal input comprises the 3rd signal input interface, the 4th signal input interface; Described 3rd signal input part comprises the 5th signal input interface, the 6th signal input interface; The output of described first operational amplifier connects voltage amplification module after the 8th resistance; First signal input interface of described first signal input part is through the first electric capacity, the inverting input of the first operational amplifier is connected after second resistance, and the first signal input interface of the first signal input part ground connection after the first parallel circuits that the first resistance and the second electric capacity are formed, the secondary signal input interface also ground connection of the first signal input part; The normal phase input end of described first operational amplifier through the 3rd resistance, the 3rd electric capacity, ground connection after the 4th resistance; The normal phase input end of described first operational amplifier, successively through the 3rd resistance, connects the 5th signal input interface of the 3rd signal input part after the second parallel circuits that the 4th electric capacity and the 5th resistance are formed and the 6th resistance; Described 6th signal input interface, successively through the anode of the first diode, connects the 5th signal input interface after negative electrode, and the 6th signal input interface ground connection; One end that described second parallel circuits is connected with the 6th resistance connects the 3rd signal input interface after the 7th resistance, and the anode of described 4th signal input interface second diode, connects the 3rd signal input interface after negative electrode, and the 4th signal input interface ground connection.
3. a kind of speaker power amplifier circuit according to claim 2, is characterized in that, described voltage amplification module comprises the first triode to the 3rd triode, and the 9th resistance is to the 18 resistance, and the 5th electric capacity is to the 9th electric capacity; The base stage of described first triode, through the 5th electric capacity, connects the output of the first operational amplifier after the 8th resistance, the emitter of the first triode is successively through the 15 resistance, and the 9th resistance, connects the output of the first operational amplifier after the tenth resistance and the 8th resistance; The base stage of described 3rd triode is through the 6th electric capacity, the output of the first operational amplifier is connected after 8th resistance, the emitter of described 3rd triode is successively through the 16 resistance, and the 12 resistance, connects the output of the first operational amplifier after the 11 resistance and the 8th resistance; The emitter of described first triode connects cathode power supply after the 15 resistance, the described base stage of 7th Capacitance parallel connection in the first triode and the two ends of collector electrode, the collector electrode of the first triode connects overcurrent protection module after the 17 resistance, and the collector electrode of the first triode connects the collector electrode of the second triode; The emitter of described second triode connects the collector electrode of the 3rd triode, the collector electrode of the 3rd triode also connects overcurrent protection module after ground 18 resistance, the emitter of described 3rd triode connects negative power supply through the 16 resistance, and described 8th Capacitance parallel connection is in the two ends of the 3rd transistor base and emitter; Described 13 resistor coupled in parallel is in the two ends of the second transistor base and collector electrode, and the described base stage of 14 resistor coupled in parallel in the second triode and the two ends of emitter, described 9th Capacitance parallel connection is in the two ends of the collector and emitter of the second triode.
4. a kind of speaker power amplifier circuit according to claim 3, it is characterized in that, described overcurrent protection module comprises the 19 resistance to the 22 resistance, tenth electric capacity is to the 13 electric capacity, 4th triode, 5th triode, 3rd diode is to the 6th diode, the collector electrode of described 4th triode is successively through the negative electrode of the 3rd diode, the anode of the 3rd diode, cathode power supply is connect after 12 electric capacity, and the collector electrode of the 4th triode connects Current amplifier module after the 3rd diode, the base stage of described 4th triode is successively through the 19 resistance, the anode of the 5th diode, ground connection after the negative electrode of the 5th diode, and the base stage of the 4th triode connects Current amplifier module, the collector electrode of described 5th triode is successively through the anode of the 4th diode, the negative electrode of the 3rd diode, negative power supply is connect after 13 electric capacity, and the collector electrode of the 5th triode connects Current amplifier module after the 4th diode, the base stage of described 5th triode is successively through the 22 resistance, the negative electrode of the 6th diode, ground connection after the anode of the 6th diode, and the base stage of the 5th triode connects Current amplifier module, the base stage of described 4th triode is through the 20 resistance, the base stage of the 5th triode is connected after 21 resistance, the emitter of described 4th triode connects the emitter of the 5th triode, and the emitter of the 4th triode is all connected with signal output module with Current amplifier module with the emitter of the 5th triode, the base stage of described tenth Capacitance parallel connection in the 4th triode and the two ends of collector electrode, the base stage of described 11 Capacitance parallel connection in the 5th triode and the two ends of collector electrode.
5. a kind of speaker power amplifier circuit according to claim 4, it is characterized in that, described Current amplifier module comprises the 23 resistance to the 30 resistance, and the 6th triode is to the 9th triode, and the collector electrode of described 6th triode and the collector electrode of the 7th triode all connect overcurrent protection module, the collector electrode of described 6th triode connects cathode power supply, the emitter of the 6th triode connects the base stage of the 8th triode after the 25 resistance, and the emitter of the 6th triode is through the 23 resistance, the emitter of the 7th triode is connected after 24 resistance, the emitter of described 7th triode connects the base stage of the 9th triode after the 26 resistance, the emitter of the 9th triode is through the 30 resistance, the 8th transistor emitter is connected after 29 resistance, the collector electrode of described 8th triode connects cathode power supply, the collector electrode of described 9th triode connects negative power supply, the emitter of described 8th triode connects overcurrent protection module after the 27 resistance, and the emitter of described 9th triode connects overcurrent protection module after the 28 resistance.
6. a kind of speaker power amplifier circuit according to claim 5, it is characterized in that, described signal output module comprises the 31 resistance to the 33 resistance, 14 electric capacity is to the 16 electric capacity, first coil, high pitched signal cathode output end, high pitched signal cathode output end, bass signal cathode output end, bass signal cathode output end, the 3rd parallel circuits that described high pitched signal cathode output end is formed through the 33 resistance and the 16 electric capacity, signal input module is connected after 15 electric capacity and the 31 resistance, and high pitched signal cathode output end connects high pitched signal cathode output end after the 3rd parallel circuits and the first coil, described high pitched signal cathode output end ground connection, and high pitched signal cathode output end connects bass signal cathode output end, described bass signal cathode output end is through the 32 resistance, ground connection after 14 electric capacity, described bass signal cathode output end connects signal input module, and bass signal cathode output end connects Current amplifier module respectively, overcurrent protection module and overload reminding module.
7. a kind of speaker power amplifier circuit according to claim 6, it is characterized in that, described overcurrent protection module comprises the 34 resistance to the 38 resistance, 17 electric capacity, 7th diode, the tenth triode, overload signal output, described overload signal output comprises the first overload signal output interface, the second overload signal output interface, described bass signal cathode output end is successively through the negative electrode of the 7th diode, the anode of the 7th diode, 34 resistance, the base stage of the tenth triode is connected after 37 resistance, and the base stage of the tenth triode is through the 37 resistance, ground connection after 35 resistance, the base stage of described tenth triode also connects negative power supply after the 38 resistance, collector electrode ground connection after the 36 resistance of described tenth triode, and the collector electrode of the tenth triode connects the first overload signal output interface, the emitter of described tenth triode connects negative power supply, one end ground connection after the 35 resistance of described 17 electric capacity, another termination negative power supply, described second overload signal output interface connects negative power supply.
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|---|---|---|---|
| CN201510822306.XA CN105375884A (en) | 2015-11-24 | 2015-11-24 | Loudspeaker box power amplification circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510822306.XA CN105375884A (en) | 2015-11-24 | 2015-11-24 | Loudspeaker box power amplification circuit |
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| CN105375884A true CN105375884A (en) | 2016-03-02 |
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| CN201510822306.XA Pending CN105375884A (en) | 2015-11-24 | 2015-11-24 | Loudspeaker box power amplification circuit |
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| CN106452368A (en) * | 2016-03-25 | 2017-02-22 | 广州万昌音响有限公司 | High-power amplifier circuit based on D type amplification push and B type output and working method thereof |
| CN106788296A (en) * | 2017-03-10 | 2017-05-31 | 深圳市品川能源电气有限公司 | Electronic switch power amplifier |
| CN109495811A (en) * | 2018-12-06 | 2019-03-19 | 广州荣锋电子科技有限公司 | Speaker |
| CN111211738A (en) * | 2020-01-13 | 2020-05-29 | 芜湖宏景电子股份有限公司 | Level amplifying circuit |
| CN117499840A (en) * | 2024-01-03 | 2024-02-02 | 广州市锐丰音响科技股份有限公司 | Operation module with sound device |
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| CN106452368A (en) * | 2016-03-25 | 2017-02-22 | 广州万昌音响有限公司 | High-power amplifier circuit based on D type amplification push and B type output and working method thereof |
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| CN111211738A (en) * | 2020-01-13 | 2020-05-29 | 芜湖宏景电子股份有限公司 | Level amplifying circuit |
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| CN117499840A (en) * | 2024-01-03 | 2024-02-02 | 广州市锐丰音响科技股份有限公司 | Operation module with sound device |
| CN117499840B (en) * | 2024-01-03 | 2024-04-30 | 广州市锐丰音响科技股份有限公司 | Operation module with sound device |
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Application publication date: 20160302 |