CN108988804A - Optocoupler amplifier circuit - Google Patents
Optocoupler amplifier circuit Download PDFInfo
- Publication number
- CN108988804A CN108988804A CN201810810060.8A CN201810810060A CN108988804A CN 108988804 A CN108988804 A CN 108988804A CN 201810810060 A CN201810810060 A CN 201810810060A CN 108988804 A CN108988804 A CN 108988804A
- Authority
- CN
- China
- Prior art keywords
- optocoupler
- amplifier
- resistance
- amplifier circuit
- circuit according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/38—Positive-feedback circuit arrangements without negative feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
- H03F3/085—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light using opto-couplers between stages
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of optocoupler amplifier circuits, including preamplifier, amplifier, post amplifier, the first optocoupler OC1 and the second optocoupler OC2；Input signal Vi enters amplifier through preamplifier, through the amplified output signal of amplifier after the first optocoupler OC1 and the second optocoupler OC2 output current signal, current signal is again through finally entering output signal Vo after post amplifier amplification through five resistance output voltage signals.Optocoupler amplifier circuit of the invention, current transfer ratio is high, and linear transfer is good.
Description
Technical field
The present invention relates to a kind of optocoupler amplifier circuits, belong to field of photoelectric technology.
Background technique
There are many existing amplifying circuit, but respectively have advantage and disadvantage, often in order to carry out Current amplifier, and sacrifice linear biography
Defeated, signal passband etc..
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, a kind of optocoupler amplifier circuit is provided,
Current transfer ratio is high, and linear transfer is good.
In order to solve the above technical problems, the present invention provides a kind of optocoupler amplifier circuit, characterized in that including preceding storing
Big device, amplifier, post amplifier, the first optocoupler OC1 and the second optocoupler OC2；
Input signal Vi enters amplifier through preamplifier, through the amplified output signal of amplifier through the first optocoupler OC1 and second
Output current signal after optocoupler OC2, current signal is again through finally entering post amplifier and putting through five resistance output voltage signals
Output signal Vo after big.
The output signal of preamplifier is connected to the normal phase input end of amplifier, and the output end of amplifier connects the first light simultaneously
The diode cathode of coupling OC1, the diode anode of the first optocoupler OC1 are connect with the diode cathode of the second optocoupler OC2, the second light
The diode anode of coupling OC2 is connected to positive supply 12V through the 4th resistance, and the transistor emitter of the first optocoupler OC1 connects negative electricity
The transistor collector of source -12V, the first optocoupler OC1 are connected to post amplifier through the 5th resistance；Three poles of second optocoupler OC2
Pipe emitter meets negative supply -12V, and the transistor collector of the second optocoupler OC2 is connected to the anti-phase input of amplifier through 3rd resistor
End, while positive supply 12V is connected to through second resistance.
Feedback capacity C is connected between the output end and inverting input terminal of amplifier.
Post amplifier input terminal is also connected to positive supply 12V through the 6th resistance simultaneously.
First optocoupler OC1 uses linear optical coupling pc817.
Second optocoupler OC2 uses linear optical coupling pc817.
Advantageous effects of the invention:
Optocoupler amplifier circuit of the invention, current transfer ratio is high, and linear transfer is good.
Detailed description of the invention
Fig. 1 is optocoupler amplifier circuit figure of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating this hair
Bright technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, optocoupler amplifier circuit of the invention includes preamplifier, amplifier, post amplifier, first
Optocoupler OC1 and the second optocoupler OC2.
Input signal Vi is input to the normal phase input end of amplifier, the output end and anti-phase input of amplifier after preamplifier
Feedback capacity C is connected between end, the output end of amplifier connects the diode cathode of the first optocoupler OC1, the first optocoupler simultaneously
The diode anode of OC1 is connect with the diode cathode of the second optocoupler OC2, and the diode anode of the second optocoupler OC2 is through resistance R4
It is connected to positive supply 12V, the transistor emitter of the first optocoupler OC1 connects negative supply -12V, the triode collection of the first optocoupler OC1
Electrode is connected to post amplifier through resistance R5, through post amplifier output signal Vo.The transistor emitter of second optocoupler OC2
Negative supply -12V is met, the transistor collector of the second optocoupler OC2 is connected to the inverting input terminal of amplifier through resistance R3, passes through simultaneously
Resistance R2 is connected to positive supply 12V.
Post amplifier input terminal is also connected to positive supply 12V through resistance R6 simultaneously.
Linear optical coupling pc817 can be selected in first optocoupler OC1 and the second optocoupler OC2.
Existing base amplifier can be used in preamplifier, post amplifier.
Input signal exports a larger current by the amplified output signal of amplifier after two optocouplers, then through resistance
R5 output voltage signal finally enters post amplifier output signal Vo.
It wishes to get and preferably waits ratios/linear transfer, the ginseng of the nominal element of equivalence of the current transfer ratio and both sides of two optocouplers
Number needs to carry out linear matched, and each operating point parameter is equal, and antithesis component values are equal or wait ratio, keeps entire circuit work online
In property region.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improve and become
Shape also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of optocoupler amplifier circuit, characterized in that including preamplifier, amplifier, post amplifier, the first optocoupler OC1
With the second optocoupler OC2；
Input signal Vi enters amplifier through preamplifier, through the amplified output signal of amplifier through the first optocoupler OC1 and second
Output current signal after optocoupler OC2, current signal is again through finally entering post amplifier amplification through five resistance output voltage signals
Output signal Vo afterwards.
2. optocoupler amplifier circuit according to claim 1, characterized in that the output signal of preamplifier is connected to fortune
The normal phase input end put, the output end of amplifier connect the diode cathode of the first optocoupler OC1, two poles of the first optocoupler OC1 simultaneously
Tube anode is connect with the diode cathode of the second optocoupler OC2, and the diode anode of the second optocoupler OC2 is connected to just through the 4th resistance
Power supply 12V, the transistor emitter of the first optocoupler OC1 meet negative supply -12V, and the transistor collector of the first optocoupler OC1 is through
Five resistance are connected to post amplifier；The transistor emitter of second optocoupler OC2 meets negative supply -12V, and the three of the second optocoupler OC2
Pole pipe collector is connected to the inverting input terminal of amplifier through 3rd resistor, while being connected to positive supply 12V through second resistance.
3. optocoupler amplifier circuit according to claim 1, characterized in that between the output end and inverting input terminal of amplifier
It is connected with feedback capacity C.
4. optocoupler amplifier circuit according to claim 1, characterized in that post amplifier input terminal is also simultaneously through the 6th
Resistance is connected to positive supply 12V.
5. optocoupler amplifier circuit according to claim 1, characterized in that the first optocoupler OC1 uses linear optical coupling
pc817。
6. optocoupler amplifier circuit according to claim 1, characterized in that the second optocoupler OC2 uses linear optical coupling
pc817。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810060.8A CN108988804A (en) | 2018-07-23 | 2018-07-23 | Optocoupler amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810060.8A CN108988804A (en) | 2018-07-23 | 2018-07-23 | Optocoupler amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108988804A true CN108988804A (en) | 2018-12-11 |
Family
ID=64550630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810810060.8A Withdrawn CN108988804A (en) | 2018-07-23 | 2018-07-23 | Optocoupler amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108988804A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218999A (en) * | 2021-03-22 | 2021-08-06 | 东莞理工学院 | Detector and detection device for weakening root surface iron membrane and promoting wetland plants to absorb heavy metals |
-
2018
- 2018-07-23 CN CN201810810060.8A patent/CN108988804A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218999A (en) * | 2021-03-22 | 2021-08-06 | 东莞理工学院 | Detector and detection device for weakening root surface iron membrane and promoting wetland plants to absorb heavy metals |
| CN113218999B (en) * | 2021-03-22 | 2022-12-13 | 东莞理工学院 | Detector and detection device for weakening root surface iron membrane and promoting wetland plants to absorb heavy metals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181211 |
|
| WW01 | Invention patent application withdrawn after publication |