CN207354222U - The power amplification circuit of loudspeaker - Google Patents
The power amplification circuit of loudspeaker Download PDFInfo
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- CN207354222U CN207354222U CN201721361926.9U CN201721361926U CN207354222U CN 207354222 U CN207354222 U CN 207354222U CN 201721361926 U CN201721361926 U CN 201721361926U CN 207354222 U CN207354222 U CN 207354222U
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- resistance
- capacitance
- triode
- amplification circuit
- power amplification
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Abstract
The utility model discloses a kind of power amplification circuit of loudspeaker, including operational amplifier, first triode, second triode, 3rd triode, first resistor, second resistance, 3rd resistor, 4th resistance, 5th resistance, 6th resistance, 7th resistance, first diode, second diode, first electrolytic capacitor, second electrolytic capacitor, 3rd capacitance, 4th capacitance, 5th capacitance, first power supply and second source, one end connection signal input part of first resistor, the other end of first resistor is connected with the anode of the first electrolytic capacitor and one end of second resistance respectively, the cathode of first electrolytic capacitor is connected with one end of 3rd resistor and the in-phase input end of operational amplifier respectively, the inverting input of operational amplifier is connected with one end of the 4th resistance and one end of the 5th resistance respectively.Implement the power amplification circuit of the loudspeaker of the utility model, have the advantages that：Circuit structure is relatively simple, cost is relatively low, the safety and reliability of circuit is higher.
Description
Technical field
Loudspeaker field is the utility model is related to, more particularly to a kind of power amplification circuit of loudspeaker.
Background technology
Loudspeaker is a kind of very common electro-acoustic transducer device, it can be seen in the electronic electric equipment of sounding,
Sound equipment group can be formed by one or more.Loudspeaker is a most weak device in electronic component, and for sound equipment
For effect, it is a most important device again.In the prior art, the power amplification circuit of loudspeaker is complicated, firmly
Part cost is higher.Further, since the power amplification circuit of loudspeaker of the prior art lacks corresponding circuit protection function, make
Safety and reliability into circuit is not high.
Utility model content
The technical problems to be solved in the utility model is, for the drawbacks described above of the prior art, there is provided a kind of circuit knot
The power amplification circuit for the loudspeaker that structure is relatively simple, cost is relatively low, the safety and reliability of circuit is higher.
Technical solution is used by the utility model solves its technical problem：Construct a kind of power amplification electricity of loudspeaker
Road, including operational amplifier, the first triode, the second triode, the 3rd triode, first resistor, second resistance, the 3rd electricity
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first diode, the second diode, the first electrolytic capacitor,
Two electrolytic capacitors, the 3rd capacitance, the 4th capacitance, the 5th capacitance, the first power supply and second source, one end of the first resistor connect
Connect signal input part, the other end of the first resistor respectively with the anode of first electrolytic capacitor and one end of second resistance
Connection, the cathode of first electrolytic capacitor connect with one end of the 3rd resistor and the in-phase input end of operational amplifier respectively
Connect, the inverting input of the operational amplifier is connected with one end of the 4th resistance and one end of the 5th resistance respectively, institute
The other end for stating the other end of second resistance, the other end of 3rd resistor and the 4th resistance is grounded, the operational amplifier
Positive electricity source pin is connected with first power supply, and the negative electricity source pin of the operational amplifier is connected with the second source, institute
The output terminal for stating operational amplifier is connected with the base stage of first triode；
The emitter of first triode is connected by the 5th capacitance with the base stage of second triode, described
The emitter of second triode is connected with the second source, the collector of first triode respectively with the 7th resistance
One end connected with one end of the 3rd capacitance, the other end of the 7th resistance other end with the 5th resistance, respectively
The emitter of the anode of two electrolytic capacitors and the 3rd triode connects, and the other end of the 3rd capacitance is respectively with the described 1st
The emitter connection of the cathode of pole pipe, the collector of the second triode and the 3rd triode, the anode point of first diode
Base stage, the cathode of the second electrolytic capacitor and one end of the 6th resistance not with the 3rd triode are connected, the 6th resistance
The other end be connected with first power supply, the collector of the 3rd triode is connected with first power supply, the described 3rd
The emitter of triode is connected with the anode of second diode, and the cathode of second diode is electric with the described 4th respectively
One end of appearance is connected with signal output part, the other end ground connection of the 4th capacitance.
In the power amplification circuit of loudspeaker described in the utility model, the 6th capacitance, the 6th capacitance are further included
One end be connected with the emitter of the 3rd triode, the other end of the 6th capacitance and the current collection of second triode
Pole connects, and the capacitance of the 6th capacitance is 200PF.
In the power amplification circuit of loudspeaker described in the utility model, the 7th capacitance, the 7th capacitance are further included
One end be connected with the output terminal of the operational amplifier, the other end of the 7th capacitance and the base stage of first triode
Connection, the capacitance of the 7th capacitance is 150PF.
In the power amplification circuit of loudspeaker described in the utility model, the 8th resistance, the two or three pole are further included
The emitter of pipe is connected by the 8th resistance with the second source, and the resistance value of the 8th resistance is 3.3K Ω.
In the power amplification circuit of loudspeaker described in the utility model, the model of second diode
NSI45020AT1G, the capacitance of the 5th capacitance is 200PF.
In the power amplification circuit of loudspeaker described in the utility model, first triode, the second triode and
3rd triode is NPN type triode.
In the power amplification circuit of loudspeaker described in the utility model, the supply voltage that first power supply provides is
+ 15V, the supply voltage that the second source provides is -15V.
Implement the power amplification circuit of the loudspeaker of the utility model, have the advantages that：Due to being put equipped with computing
Big device, the first triode, the second triode, the 3rd triode, first resistor, second resistance, 3rd resistor, the 4th resistance, the
Five resistance, the 6th resistance, the 7th resistance, the first diode, the second diode, the first electrolytic capacitor, the second electrolytic capacitor, the 3rd
Capacitance, the 4th capacitance, the 5th capacitance, the first power supply and second source, the power amplification circuit of the loudspeaker is relative to traditional
Power amplification circuit, the component that it is used is less, can so reduce hardware cost, in addition, the second diode is current limliting two
Pole pipe, for carrying out current-limiting protection to the branch between the 3rd triode and signal output part, the 5th capacitance is coupled capacitor, is used
In preventing the interference between the first triode and the second triode, therefore circuit structure is relatively simple, cost is relatively low, the peace of circuit
Full property and reliability are higher.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the circuit diagram in power amplification circuit one embodiment of the utility model loudspeaker.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained, shall fall within the protection scope of the present invention.
In the power amplification circuit embodiment of the utility model loudspeaker, the circuit of the power amplification circuit of the loudspeaker
Schematic diagram is as shown in Figure 1.In Fig. 1, the power amplification circuit of the loudspeaker includes operational amplifier A 1, the first triode Q1, the
Two triode Q2, the 3rd triode Q3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the 7th resistance R7, the first diode D1, the second diode D2, the first electrolytic capacitor C1, the second electrolysis electricity
Hold C2, the 3rd capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the first power supply VCC and second source VDD, wherein, first resistor
The other end of one end connection the signal input part IN, first resistor R1 of R1 are electric with the anode of the first electrolytic capacitor C1 and second respectively
Hinder one end connection of R2, the cathode of the first electrolytic capacitor C1 respectively with one end of 3rd resistor R3 and the same phase of operational amplifier A 1
Input terminal connects, and the inverting input of operational amplifier A 1 connects with one end of the 4th resistance R4 and one end of the 5th resistance R5 respectively
Connect, the other end of the other end of second resistance R2, the other end of 3rd resistor R3 and the 4th resistance R4 is grounded, operational amplifier
The positive electricity source pin of A1 is connected with the first power supply VCC, and the negative electricity source pin of operational amplifier A 1 is connected with second source VDD, fortune
The output terminal for calculating amplifier A1 is connected with the base stage of the first triode Q1.
The emitter of first triode Q1 is connected by the 5th capacitance C5 with the base stage of the second triode Q2, the second triode
The emitter of Q2 is connected with second source VDD, the collector of the first triode Q1 one end and the 3rd with the 7th resistance R7 respectively
One end connection of capacitance C3, the other end of the 7th resistance the R7 other end with the 5th resistance R5, the second electrolytic capacitor C2 respectively
The emitter of anode and the 3rd triode Q3 connect, the other end of the 3rd capacitance the C3 cathode with the first diode D1, the respectively
The connection of the emitter of the collector of two triode Q2 and the 3rd triode Q3, the anode of the first diode D1 respectively with the three or three pole
One end connection of the base stage of pipe Q3, the cathode of the second electrolytic capacitor C2 and the 6th resistance R6, the other end of the 6th resistance R6 and the
One power supply VCC connections, the collector of the 3rd triode Q3 are connected with the first power supply VCC, the emitter of the 3rd triode Q3 and
The anode connection of two diode D2, the cathode of the second diode D2 one end with the 4th capacitance C4 and signal output part OUT respectively
Connection, the other end ground connection of the 4th capacitance C4.
The power amplification circuit of the loudspeaker is relative to traditional power amplification circuit, and the component that it is used is less, electricity
Line structure is relatively simple, can so reduce hardware cost, in addition, the second diode D2 is Current Limiting Diodes, for the 3rd
Branch between triode Q3 and signal output part OUT carries out current-limiting protection, and the 5th capacitance C5 is coupled capacitor, for preventing the
Interference between one triode Q1 and the second triode Q2, therefore the safety and reliability of circuit is higher.
It is noted that in the present embodiment, the model NSI45020AT1G of the second diode D2, the 5th capacitance C5's
Capacitance is 200PF.Certainly, under the certain situation of the present embodiment, the second diode D2 can also select other models to have
The diode of similar functions, the capacitance of the 5th capacitance C5 can also select other values as the case may be.
In the present embodiment, operational amplifier A 1,3rd resistor R3, the 4th resistance R4 and the 5th resistance R5 form the first order and put
Big circuit, the second triode Q2, the 3rd triode Q3, the 6th resistance R6, the second electrolytic capacitor C2 and the 3rd capacitance form second
Level amplifying circuit.When AC signal transports to the 3rd triode Q3, under signal positive half cycle, the collector potential of the 3rd triode Q3
Drop, connects loudspeaker (being not drawn into figure)；In signal negative half period, the collector potential of the 3rd triode Q3 raises, through the one or two
Pole pipe D1 adds to the base stage of the second triode Q2, and the second triode Q2 conductings, connect loudspeaker.The power amplification electricity of the loudspeaker
Road distortion is smaller, and efficiency is higher.
It is noted that in the present embodiment, the first triode Q1, the second triode Q2 and the 3rd triode Q3 are
NPN type triode.Certainly, under the certain situation of the present embodiment, the first triode Q1, the second triode Q2 and the 3rd triode
Q3 can also be P-channel metal-oxide-semiconductor, but at this moment the structure of circuit also will accordingly change.
In the present embodiment, the power amplification circuit of the loudspeaker further includes the 6th capacitance C6, one end of the 6th capacitance C6 with
The emitter connection of 3rd triode Q3, the other end of the 6th capacitance C6 are connected with the collector of the second triode Q2, the 6th electricity
The capacitance for holding C6 is 200PF.6th capacitance C6 is coupled capacitor, for prevent the second triode Q2 and the 3rd triode Q3 it
Between interference, to further enhance the safety and reliability of circuit.Certainly, under the certain situation of the present embodiment, the 6th electricity
The capacitance for holding C6 can also be other values as the case may be.
In the present embodiment, the power amplification circuit of the loudspeaker further includes the 7th capacitance C7, one end of the 7th capacitance C7 with
The output terminal connection of operational amplifier A 1, the other end of the 7th capacitance C7 are connected with the base stage of the first triode Q1, the 7th capacitance
The capacitance of C7 is 150PF.7th capacitance C7 is coupled capacitor, for preventing between 1 and first triode Q1 of operational amplifier A
Interference, it is higher further to strengthen the safety and reliability of circuit.Under the certain situation of the present embodiment, the 7th capacitance
The capacitance of C7 can also be other values.
In the present embodiment, the power amplification circuit of the loudspeaker further includes the 8th resistance R8, the transmitting of the second triode Q2
Pole is connected by the 8th resistance R8 with second source VDD, and the resistance value of the 8th resistance R8 is 3.3K Ω.8th resistance R8 is limited galvanic electricity
Resistance, for carrying out current-limiting protection to the emitter current of the second triode Q2, to further enhance current limitation effect.In practical application
In, the resistance value of the 8th resistance R8 can also adjust accordingly as the case may be.
It is noted that in the present embodiment, the supply voltage that the first power supply VCC is provided is+15V, and second source VDD is carried
The supply voltage of confession is -15V.Certainly, under the certain situation of the present embodiment, the size of the first power supply VCC and second source VDD
It can also adjust accordingly as the case may be.
In short, the power amplification circuit of the loudspeaker is relative to traditional power amplification circuit, its component used compared with
Few, circuit structure is relatively simple, can so reduce hardware cost, two pole of current limliting is equipped with the power amplification circuit of the loudspeaker
Pipe and coupled capacitor, therefore the safety and reliability of circuit is higher.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on, should be included in the utility model
Protection domain within.
Claims (7)
1. a kind of power amplification circuit of loudspeaker, it is characterised in that including operational amplifier, the first triode, the two or three pole
Pipe, the 3rd triode, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
First diode, the second diode, the first electrolytic capacitor, the second electrolytic capacitor, the 3rd capacitance, the 4th capacitance, the 5th capacitance,
One power supply and second source, one end connection signal input part of the first resistor, the other end of the first resistor respectively with
The anode of first electrolytic capacitor is connected with one end of second resistance, and the cathode of first electrolytic capacitor is respectively with described
One end of three resistance is connected with the in-phase input end of operational amplifier, the inverting input of the operational amplifier respectively with it is described
One end of 4th resistance is connected with one end of the 5th resistance, the other end of the second resistance, the other end of 3rd resistor and
The other end of four resistance is grounded, and the positive electricity source pin of the operational amplifier is connected with first power supply, and the computing is put
The negative electricity source pin of big device is connected with the second source, the base of the output terminal of the operational amplifier and first triode
Pole connects；
The emitter of first triode is connected by the 5th capacitance with the base stage of second triode, and described second
The emitter of triode is connected with the second source, the collector of first triode respectively with the 7th resistance one
End is connected with one end of the 3rd capacitance, the other end of the 7th resistance other end with the 5th resistance, second electric respectively
Solve the emitter connection of the anode and the 3rd triode of capacitance, the other end of the 3rd capacitance respectively with first diode
Cathode, the second triode collector and the 3rd triode emitter connection, the anode of first diode respectively with
The base stage of 3rd triode, the cathode of the second electrolytic capacitor and the 6th resistance one end connection, the 6th resistance it is another
One end is connected with first power supply, and the collector of the 3rd triode is connected with first power supply, the three or three pole
The emitter of pipe is connected with the anode of second diode, the cathode of second diode respectively with the 4th capacitance
One end is connected with signal output part, the other end ground connection of the 4th capacitance.
2. the power amplification circuit of loudspeaker according to claim 1, it is characterised in that the 6th capacitance is further included, it is described
One end of 6th capacitance is connected with the emitter of the 3rd triode, the other end and the two or three pole of the 6th capacitance
The collector connection of pipe, the capacitance of the 6th capacitance is 200PF.
3. the power amplification circuit of loudspeaker according to claim 2, it is characterised in that the 7th capacitance is further included, it is described
One end of 7th capacitance is connected with the output terminal of the operational amplifier, the other end and the one or three pole of the 7th capacitance
The base stage connection of pipe, the capacitance of the 7th capacitance is 150PF.
4. the power amplification circuit of loudspeaker according to claim 3, it is characterised in that the 8th resistance is further included, it is described
The emitter of second triode is connected by the 8th resistance with the second source, and the resistance value of the 8th resistance is 3.3K
Ω。
5. the power amplification circuit of loudspeaker according to any one of claims 1 to 4, it is characterised in that described second
The model NSI45020AT1G of diode, the capacitance of the 5th capacitance is 200PF.
6. the power amplification circuit of loudspeaker according to claim 5, it is characterised in that first triode, second
Triode and the 3rd triode are NPN type triode.
7. the power amplification circuit of loudspeaker according to claim 5, it is characterised in that the confession that first power supply provides
Piezoelectric voltage is+15V, and the supply voltage that the second source provides is -15V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721361926.9U CN207354222U (en) | 2017-10-20 | 2017-10-20 | The power amplification circuit of loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721361926.9U CN207354222U (en) | 2017-10-20 | 2017-10-20 | The power amplification circuit of loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207354222U true CN207354222U (en) | 2018-05-11 |
Family
ID=62355267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721361926.9U Expired - Fee Related CN207354222U (en) | 2017-10-20 | 2017-10-20 | The power amplification circuit of loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207354222U (en) |
-
2017
- 2017-10-20 CN CN201721361926.9U patent/CN207354222U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 551700 Guizhou Jinsha County Economic Development Zone, Bijie, two phase A15 plant Patentee after: GUIZHOU YUHUALONG ELECTRONIC TECHNOLOGY CO., LTD. Address before: 551700 Guizhou Jinsha County Economic Development Zone, Liupanshui, two phase A15 plant Patentee before: GUIZHOU YUHUALONG ELECTRONIC TECHNOLOGY CO., LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180511 Termination date: 20181020 |