CN109768779A - A kind of power amplification circuit - Google Patents
A kind of power amplification circuit Download PDFInfo
- Publication number
- CN109768779A CN109768779A CN201910041236.2A CN201910041236A CN109768779A CN 109768779 A CN109768779 A CN 109768779A CN 201910041236 A CN201910041236 A CN 201910041236A CN 109768779 A CN109768779 A CN 109768779A
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- China
- Prior art keywords
- amplifier
- level amplifier
- power amplification
- amplification circuit
- output end
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- 230000003321 amplification Effects 0.000 title claims abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 23
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000004520 electroporation Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The invention discloses a kind of power amplification circuits, including first order amplifier, second level amplifier, third level amplifier, primary feedback unit and frequency compensation unit, further include current-limiting protection device and overtemperature protection system.Rationally, the exportable power of circuit is big, the linearity is good, reduces total harmonic distortion, and solves the heat dissipation and resistance matching problem of power amplification circuit for power amplification circuit design of the invention, is suitble to promote and apply.
Description
Technical field
The invention belongs to electroporation fields, are related to a kind of power amplification circuit.
Background technique
Power amplification circuit is a kind of amplifying circuit for the purpose of exporting relatively high power.It generally directly drives load,
Load capacity is eager to excel.Output stage of the power amplification circuit usually as multistage amplifier circuit.In many electronic equipments, it is desirable that put
The output stage of big circuit is able to drive certain load, such as driving instrument, makes throw of pointer；Drive the speaker is allowed to sounding；Or
Drive the executing agency etc. in automatic control system.In a word, it is desirable that amplifying circuit has sufficiently large output power.Such amplification
Circuit is referred to as power amplification circuit.Non-linear distortion, which requires power amplification circuit, to be worked under big signal, so can not keep away
Non-linear distortion can be generated with exempting from, and same power tube output power is bigger, non-linear distortion is often more serious, this just makes defeated
Power and non-linear distortion become a pair of of principal contradiction out.But under different occasions, the requirement to non-linear distortion is different,
For example, this problem seems important in measuring system and electroacoustic equipment.In addition, the heat dissipation problem of BJT is in power amplification circuit
In, there is sizable power consumption on the collector junction of pipe, increases junction temperature and case temperature.In order to make full use of permission
Pipe consumes and pipe is made to export sufficiently large power, and the heat dissipation of amplifying device just becomes a major issue.
Summary of the invention
The purpose of the present invention is to provide a kind of power amplification circuits.
Itself the specific technical proposal is:
A kind of power amplification circuit, including first order amplifier, second level amplifier, third level amplifier, primary feedback unit and
Frequency compensation unit, external two differential signals respectively correspond two input terminals of input first order amplifier, first order amplifier
Output end is connect with the input terminal of second level amplifier, and the output end of second level amplifier and the input terminal of third level amplifier connect
It connects, frequency compensation unit is connected between the output end of first order amplifier and the output end of third level amplifier, wherein power
Amplifying circuit further includes an additional feedback unit, and second level amplifier is differential input amplifier, the output of first order amplifier
End is connect with the normal phase input end of second level amplifier, the inverting input terminal of second level amplifier and one end of additional feedback unit
Connection, it further includes current-limiting protection device and overheat that the other end of additional feedback unit is connect with the output end of third level amplifier
Protective device.
Further, the overtemperature protection system is connected on a heat sink using integrated temperature switch chip.
It further, further include impedance matching circuit.
The utility model has the advantages that
Rationally, the exportable power of circuit is big, the linearity is good, reduces total harmonic distortion for power amplification circuit design of the invention,
And it solves the heat dissipation and resistance matching problem of power amplification circuit, is suitble to promote and apply.
Detailed description of the invention
Fig. 1 is the schematic diagram of power amplification circuit of the present invention.
Specific embodiment
Technical solution of the present invention is described in more detail in the following with reference to the drawings and specific embodiments.
Referring to Fig.1, a kind of power amplification circuit, including first order amplifier, second level amplifier, third level amplifier,
Primary feedback unit and frequency compensation unit, external two differential signals respectively correspond two input terminals of input first order amplifier, the
The output end of first stage amplifier is connect with the input terminal of second level amplifier, and the output end of second level amplifier and the third level are amplified
The input terminal of device connects, frequency compensation unit be connected to first order amplifier output end and third level amplifier output end it
Between, wherein power amplification circuit further includes an additional feedback unit, and second level amplifier is differential input amplifier, the first order
The output end of amplifier is connect with the normal phase input end of second level amplifier, and the inverting input terminal and auxiliary of second level amplifier are anti-
One end connection of unit is presented, the other end of additional feedback unit is connect with the output end of third level amplifier, further includes that current limliting is protected
Protection unit and overtemperature protection system.
The overtemperature protection system is connected on a heat sink using integrated temperature switch chip.
It further include impedance matching circuit.
Power amplification circuit of the invention in the specific application process, is equipped with current-limiting protection device and overtemperature protection system,
It can be to avoid overheating and burn caused by output short-circuit；Equipped with impedance matching circuit, the requirement of impedance matching can satisfy.
The foregoing is only a preferred embodiment of the present invention, the scope of protection of the present invention is not limited to this, it is any ripe
Know those skilled in the art within the technical scope of the present disclosure, the letter for the technical solution that can be become apparent to
Altered or equivalence replacement are fallen within the protection scope of the present invention.
Claims (3)
1. a kind of power amplification circuit, including first order amplifier, second level amplifier, third level amplifier, primary feedback unit
And frequency compensation unit, external two differential signals respectively correspond two input terminals of input first order amplifier, first order amplifier
Output end connect with the input terminal of second level amplifier, the input terminal of the output end of second level amplifier and third level amplifier
Connection, frequency compensation unit are connected between the output end of first order amplifier and the output end of third level amplifier, wherein function
Rate amplifying circuit further includes an additional feedback unit, and second level amplifier is differential input amplifier, first order amplifier it is defeated
Outlet is connect with the normal phase input end of second level amplifier, the inverting input terminal of second level amplifier and the one of additional feedback unit
End connection, the other end of additional feedback unit are connect with the output end of third level amplifier, which is characterized in that further include that current limliting is protected
Protection unit and overtemperature protection system.
2. power amplification circuit according to claim 1, which is characterized in that the overtemperature protection system uses integrated temperature
Switch chip connects on a heat sink.
3. power amplification circuit according to claim 1, which is characterized in that further include impedance matching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910041236.2A CN109768779A (en) | 2019-01-16 | 2019-01-16 | A kind of power amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910041236.2A CN109768779A (en) | 2019-01-16 | 2019-01-16 | A kind of power amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109768779A true CN109768779A (en) | 2019-05-17 |
Family
ID=66452438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910041236.2A Pending CN109768779A (en) | 2019-01-16 | 2019-01-16 | A kind of power amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109768779A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114172476A (en) * | 2022-02-09 | 2022-03-11 | 成都嘉纳海威科技有限责任公司 | Broadband negative feedback amplifier |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090115528A1 (en) * | 2007-11-03 | 2009-05-07 | Zhenwu Wang | Low Cost High Performance Power Amplifier Utilizing Two-Stage-Included Local Negative Feedback with Feedback-Shifting Technology |
| CN203747759U (en) * | 2014-01-16 | 2014-07-30 | 四川和芯微电子股份有限公司 | Power amplification circuit |
-
2019
- 2019-01-16 CN CN201910041236.2A patent/CN109768779A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090115528A1 (en) * | 2007-11-03 | 2009-05-07 | Zhenwu Wang | Low Cost High Performance Power Amplifier Utilizing Two-Stage-Included Local Negative Feedback with Feedback-Shifting Technology |
| CN203747759U (en) * | 2014-01-16 | 2014-07-30 | 四川和芯微电子股份有限公司 | Power amplification circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114172476A (en) * | 2022-02-09 | 2022-03-11 | 成都嘉纳海威科技有限责任公司 | Broadband negative feedback amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190517 |