CN207354224U - Power amplification circuit for speaker of voice box - Google Patents
Power amplification circuit for speaker of voice box Download PDFInfo
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- CN207354224U CN207354224U CN201721361808.8U CN201721361808U CN207354224U CN 207354224 U CN207354224 U CN 207354224U CN 201721361808 U CN201721361808 U CN 201721361808U CN 207354224 U CN207354224 U CN 207354224U
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- resistance
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- capacitance
- diode
- electrolytic capacitor
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Abstract
The utility model discloses a kind of power amplification circuit for speaker of voice box,Including operational amplifier,First triode,Second triode,3rd triode,First electrolytic capacitor,Second electrolytic capacitor,3rd capacitance,4th electrolytic capacitor,5th capacitance,6th capacitance,7th capacitance,First diode,Second diode,3rd diode,First resistor,Second resistance,3rd resistor,4th resistance,5th resistance,First power supply and second source,One end of first resistor is connected with the anode of the first electrolytic capacitor,One end of first resistor is also connected with signal input part,The cathode of first electrolytic capacitor is connected with one end of second resistance and the in-phase input end of operational amplifier respectively,The other end of first resistor and the other end of second resistance are grounded,The inverting input of operational amplifier is connected with the cathode of the second electrolytic capacitor and one end of 3rd resistor.The utility model circuit structure is relatively simple, cost is relatively low, the safety and reliability of circuit is higher.
Description
Technical field
It the utility model is related to speaker field, more particularly to a kind of power amplification circuit for speaker of voice box.
Background technology
Speaker of voice box is a kind of electro-acoustic transducer device, is commonly used in the electronic electric equipment of sounding, it is necessary to power amplification
Circuit drives could sounding.Power amplification circuit is a kind of amplifying circuit for the purpose of exporting relatively high power, generally can be straight
Driving load is connect, load capacity is eager to excel.At present, the power amplification circuit of in the market speaker is complicated, and hardware cost is higher.
Further, since it lacks corresponding circuit protection function, cause the safety and reliability of circuit 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 speaker of voice box 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 work(for speaker of voice box
Rate amplifying circuit, including operational amplifier, the first triode, the second triode, the 3rd triode, the first electrolytic capacitor, second
Electrolytic capacitor, the 3rd capacitance, the 4th electrolytic capacitor, the 5th capacitance, the 6th capacitance, the 7th capacitance, the first diode, the two or two pole
Pipe, the 3rd diode, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first power supply and the second electricity
Source, one end of the first resistor are connected with the anode of first electrolytic capacitor, and one end of the first resistor is also connected with letter
Number input terminal, the cathode of first electrolytic capacitor respectively with one end of the second resistance and the homophase input of operational amplifier
End connection, the other end of the first resistor and the other end of second resistance are grounded, the anti-phase input of the operational amplifier
End is connected with the cathode of second electrolytic capacitor and one end of 3rd resistor respectively, and the anode of second electrolytic capacitor connects
Ground, the other end of the 3rd resistor are connected with the collector of first triode, the positive pole of the operational amplifier
One end respectively with first power supply and the 3rd capacitance is held to be connected, the other end ground connection of the 3rd capacitance, the computing is put
The power cathode end 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 collector of first triode also respectively the anode with the 4th electrolytic capacitor, the 5th capacitance one end,
The emitter of 3rd triode, the anode of the second diode, one end of the 6th capacitance are connected with signal output part, the 4th electricity
The cathode of solution capacitance is connected with the cathode of the 3rd diode and one end of the 5th resistance respectively, the sun of the 3rd diode
Pole is connected with first power supply, the other end of the 5th resistance anode with first diode and the three or three pole respectively
The base stage connection of pipe, the cathode of the cathode of first diode other end with the 5th capacitance, the second diode respectively
Connected with the collector of the second triode, the anode of second diode is connected with the emitter of the 3rd triode, institute
The emitter for stating the first triode is connected with one end of the 4th resistance and one end of the 7th capacitance respectively, the 7th capacitance
The other end be connected with the base stage of second triode, the other end of the 4th resistance and the emitter of the second triode are equal
It is connected with the second source, the other end ground connection of the 6th capacitance.
It is described described in the utility model in the power amplification circuit of speaker of voice box, further including the 6th resistance
One end of 6th resistance is connected with the collector of first triode, the other end and the three or three pole of the 6th resistance
The emitter connection of pipe, the resistance value of the 6th resistance is 3.3K Ω.
It is described described in the utility model in the power amplification circuit of speaker of voice box, further including the 7th resistance
One end of 7th resistance is connected with the cathode of second diode, the other end and second triode of the 7th resistance
Collector connection, the resistance value of the 7th resistance is 4.7K Ω.
It is described described in the utility model in the power amplification circuit of speaker of voice box, further including the 8th resistance
One end of 8th resistance is connected with first power supply, the other end of the 8th resistance and the collector of the 3rd triode
Connection, the resistance value of the 8th resistance is 0.8K Ω.
Described in the utility model in the power amplification circuit of speaker of voice box, the model of the 3rd diode
For NSI45020AT1G, the capacitance of the 7th capacitance is 300PF.
Described in the utility model in the power amplification circuit of speaker of voice box, first triode, second
Triode and the 3rd triode are NPN type triode.
Implement the power amplification circuit for speaker of voice box of the utility model, have the advantages that：Due to setting
There are operational amplifier, the first triode, the second triode, the 3rd triode, the first electrolytic capacitor, the second electrolytic capacitor, the 3rd
Capacitance, the 4th electrolytic capacitor, the 5th capacitance, the 6th capacitance, the 7th capacitance, the first diode, the second diode, the three or two pole
Pipe, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first power supply and second source, the utility model
Relative to the power amplification circuit of traditional speaker of voice box, the component that it is used is less, can so reduce hardware cost,
In addition, the 3rd diode is used to carry out current limliting, the 7th capacitance is used to prevent the interference between the first triode and the second triode,
Therefore circuit structure is relatively simple, cost is relatively low, the safety and reliability of circuit is 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 that the utility model is used in power amplification circuit one embodiment of speaker of voice box.
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 that the utility model is used for speaker of voice box, this is used for the work(of speaker of voice box
The circuit diagram of rate amplifying circuit is as shown in Figure 1.In Fig. 1, which includes computing
Amplifier A, the first triode Q1, the second triode Q2, the 3rd triode Q3, the first electrolytic capacitor C1, the second electrolytic capacitor C2,
3rd capacitance C3, the 4th electrolytic capacitor C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C7, the first diode D1, second
Diode D2, the 3rd diode D3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5,
First power supply VCC and second source VDD, wherein, one end of first resistor R1 is connected with the anode of the first electrolytic capacitor C1, and first
One end of resistance R1 is also connected with the cathode of signal input part IN, the first electrolytic capacitor C1 one end with second resistance R2 and fortune respectively
The in-phase input end connection of amplifier A is calculated, the other end of first resistor R1 and the other end of second resistance R2 are grounded, and computing is put
The inverting input of big device A is connected with the cathode of the second electrolytic capacitor C2 and one end of 3rd resistor R3 respectively, the second electrolysis electricity
Hold the anode ground connection of C2, the other end of 3rd resistor R3 is connected with the collector of the first triode Q1, the power supply of operational amplifier A
The one end of positive terminal respectively with the first power supply VCC and the 3rd capacitance C3 is connected, the other end ground connection of the 3rd capacitance C3, operation amplifier
The power cathode end of device A is connected with second source VDD, and the output terminal of operational amplifier A is connected with the base stage of the first triode Q1.
The collector of first triode the Q1 also anode with the 4th electrolytic capacitor C4, one end of the 5th capacitance C5, respectively
The emitter of three triode Q3, the anode of the second diode D2, one end of the 6th capacitance C6 are connected with signal output part OUT, the
The cathode of four electrolytic capacitor C4 is connected with the cathode of the 3rd diode D3 and one end of the 5th resistance R5 respectively, the 3rd diode D3
Anode be connected with the first power supply VCC, the other end of the 5th resistance the R5 anode with the first diode D1 and the three or three pole respectively
The base stage connection of pipe Q3, the cathode of the first diode D1 other end with the 5th capacitance C5, the cathode of the second diode D2 respectively
Being connected with the collector of the second triode Q2, the anode of the second diode D2 is connected with the emitter of the 3rd triode Q3, and first
The emitter of triode Q1 is connected with one end of the 4th resistance R4 and one end of the 7th capacitance C7 respectively, and the 7th capacitance C7's is another
End is connected with the base stage of the second triode Q2, and the emitter of the other end of the 4th resistance R4 and the second triode Q2 are electric with second
Source VDD connections, the other end ground connection of the 6th capacitance C6.
For the utility model relative to the power amplification circuit of traditional speaker of voice box, the component that it is used is less, this
Sample can reduce hardware cost.In addition, the 3rd diode D3 is Current Limiting Diodes, for the 5th resistance R5 and the first power supply
Branch between VCC carries out current-limiting protection, and the 7th capacitance C7 is coupled capacitor, for preventing the first triode Q1 and the two or three pole
Interference between pipe Q2, therefore the safety and reliability of circuit is higher.It is noted that in the present embodiment, the three or two pole
The capacitance of the model NSI45020AT1G, the 7th capacitance C7 of pipe D3 are 300PF.Certainly, in practical applications, the three or two pole
Pipe D3 can also use other models to have the diode of similar functions, and the capacitance of the 7th capacitance C7 can also be according to specific feelings
Condition adjusts accordingly.The supply voltage that first power supply VCC is provided be+15V, the supply voltage that second source VDD is provided is-
15V, in practical applications, the supply voltage that the first power supply VCC and second source VDD are provided can also be other values.
In the present embodiment, operational amplifier A, second resistance R2 and 3rd resistor R3 composition first order amplifying circuits, second
Triode Q2, the 3rd triode Q3, the 5th resistance R5, the 3rd diode D3, the 4th capacitance C4 and the 5th capacitance C5 form second
Level amplifying circuit.When AC signal transports to the 3rd triode Q3, in the positive half cycle of signal, the collector potential of the 3rd triode Q3
Decline, the second diode D2 conductings, connect loudspeaker (being not drawn into figure)；In the negative half period of signal, the collection of the 3rd triode Q3
Electrode potential raises, the second diode D2 cut-offs, and the collector of the second triode Q2, the two or three pole are added to through the first diode D1
Pipe Q2 is turned on, and connects loudspeaker.The power amplification circuit distortion that this is used for speaker of voice box 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 PNP type triode, but at this moment the structure of circuit also will accordingly change.
In the present embodiment, which further includes the 6th resistance R6, the 6th resistance R6
One end be connected with the collector of the first triode Q1, the emitter of the other end of the 6th resistance R6 and the 3rd triode Q3 connect
Connect.6th resistance R6 is current-limiting resistance, for carrying out current limliting guarantor to the branch between the first triode Q1 and the 3rd triode Q3
Shield, to further enhance the safety and reliability of circuit.It is noted that in the present embodiment, the resistance value of the 6th resistance R6
For 3.3K Ω, certainly, in practical applications, the resistance value of the 6th resistance R6 can also adjust accordingly as the case may be.
In the present embodiment, which further includes the 7th resistance R7, the 7th resistance R7
One end be connected with the cathode of the second diode D2, the other end of the 7th resistance R7 is connected with the collector of the second triode Q2.
7th resistance R7 is current-limiting resistance, for carrying out current-limiting protection to the collector current of the second triode Q2, further to increase
The safety and reliability on forceful electric power road.It is noted that in the present embodiment, the resistance value of the 7th resistance R7 is 4.7K Ω, certainly,
In practical applications, the resistance value of the 7th resistance R7 can adjust accordingly as the case may be.
In the present embodiment, which further includes the 8th resistance R8, the 8th resistance R8
One end be connected with the first power supply VCC, the other end of the 8th resistance R8 is connected with the collector of the 3rd triode Q3.8th resistance
R8 is current-limiting resistance, for carrying out current-limiting protection to the collector current of the 3rd triode Q3, to further enhance current limitation effect.
It is noted that in the present embodiment, the resistance value of the 8th resistance R8 is 0.8K Ω, certainly, in practical applications, the 8th resistance R8
Resistance value can also adjust accordingly as the case may be.
In short, power amplification circuit of the utility model relative to traditional speaker of voice box, its component used compared with
Few, circuit structure is relatively simple, can so reduce hardware cost, in addition, this is used for the power amplification circuit of speaker of voice box
In be equipped with Current Limiting Diodes 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 (6)
- A kind of 1. power amplification circuit for speaker of voice box, it is characterised in that including operational amplifier, the first triode, Second triode, the 3rd triode, the first electrolytic capacitor, the second electrolytic capacitor, the 3rd capacitance, the 4th electrolytic capacitor, the 5th electricity Appearance, the 6th capacitance, the 7th capacitance, the first diode, the second diode, the 3rd diode, first resistor, second resistance, the 3rd Resistance, the 4th resistance, the 5th resistance, the first power supply and second source, one end of the first resistor and the described first electrolysis electricity The anode connection of appearance, one end of the first resistor are also connected with signal input part, the cathode of first electrolytic capacitor respectively with One end of the second resistance is connected with the in-phase input end of operational amplifier, the other end and second resistance of the first resistor The other end be grounded, the inverting input of the operational amplifier respectively with the cathode of second electrolytic capacitor and the 3rd electricity One end connection of resistance, the anode ground connection of second electrolytic capacitor, the other end of the 3rd resistor and first triode Collector connection, the power positive end of the operational amplifier connects with one end of first power supply and the 3rd capacitance respectively Connect, the other end ground connection of the 3rd capacitance, the power cathode end of the operational amplifier is connected with the second source, described The output terminal of operational amplifier is connected with the base stage of first triode；The collector of first the triode also anode with the 4th electrolytic capacitor, one end of the 5th capacitance, the 3rd respectively The emitter of triode, the anode of the second diode, one end of the 6th capacitance are connected with signal output part, the 4th electrolysis electricity The cathode of appearance is connected with the cathode of the 3rd diode and one end of the 5th resistance respectively, the anode of the 3rd diode with First power supply connection, the other end of the 5th resistance respectively with the anode of first diode and the 3rd triode Base stage connects, the cathode of first diode other end with the 5th capacitance, the cathode of the second diode and the respectively The collector connection of two triodes, the anode of second diode is connected with the emitter of the 3rd triode, and described the The emitter of one triode is connected with one end of the 4th resistance and one end of the 7th capacitance respectively, the 7th capacitance it is another One end is connected with the base stage of second triode, and the other end of the 4th resistance and the emitter of the second triode are and institute State second source connection, the other end ground connection of the 6th capacitance.
- 2. the power amplification circuit according to claim 1 for speaker of voice box, it is characterised in that further include the 6th electricity Resistance, one end of the 6th resistance is connected with the collector of first triode, the other end of the 6th resistance with it is described The emitter connection of 3rd triode, the resistance value of the 6th resistance is 3.3K Ω.
- 3. the power amplification circuit according to claim 2 for speaker of voice box, it is characterised in that further include the 7th electricity Resistance, one end of the 7th resistance is connected with the cathode of second diode, the other end of the 7th resistance and described the The collector connection of two triodes, the resistance value of the 7th resistance is 4.7K Ω.
- 4. the power amplification circuit according to claim 3 for speaker of voice box, it is characterised in that further include the 8th electricity Resistance, one end of the 8th resistance are connected with first power supply, the other end and the 3rd triode of the 8th resistance Collector connection, the resistance value of the 8th resistance is 0.8K Ω.
- 5. the power amplification circuit according to any one of claims 1 to 4, for speaker of voice box, it is characterised in that The model NSI45020AT1G of 3rd diode, the capacitance of the 7th capacitance is 300PF.
- 6. the power amplification circuit according to any one of claims 1 to 4, for speaker of voice box, it is characterised in that First triode, the second triode and the 3rd triode are NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721361808.8U CN207354224U (en) | 2017-10-20 | 2017-10-20 | Power amplification circuit for speaker of voice box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721361808.8U CN207354224U (en) | 2017-10-20 | 2017-10-20 | Power amplification circuit for speaker of voice box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207354224U true CN207354224U (en) | 2018-05-11 |
Family
ID=62355233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721361808.8U Expired - Fee Related CN207354224U (en) | 2017-10-20 | 2017-10-20 | Power amplification circuit for speaker of voice box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207354224U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109285489A (en) * | 2018-11-20 | 2019-01-29 | 安徽奕甲文化传媒有限责任公司 | Show piece intelligent menu display systems |
| CN109495811A (en) * | 2018-12-06 | 2019-03-19 | 广州荣锋电子科技有限公司 | Speaker |
| CN110728837A (en) * | 2019-11-07 | 2020-01-24 | 广州市赛狄王体育用品有限公司 | Basketball formula intelligence audio amplifier control system based on wireless mode |
-
2017
- 2017-10-20 CN CN201721361808.8U patent/CN207354224U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109285489A (en) * | 2018-11-20 | 2019-01-29 | 安徽奕甲文化传媒有限责任公司 | Show piece intelligent menu display systems |
| CN109495811A (en) * | 2018-12-06 | 2019-03-19 | 广州荣锋电子科技有限公司 | Speaker |
| CN110728837A (en) * | 2019-11-07 | 2020-01-24 | 广州市赛狄王体育用品有限公司 | Basketball formula intelligence audio amplifier control system based on wireless mode |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| 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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| CP02 | Change in the address of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180511 Termination date: 20181020 |
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| CF01 | Termination of patent right due to non-payment of annual fee |