CN105634413A - Operational amplifier control circuit - Google Patents
Operational amplifier control circuit Download PDFInfo
- Publication number
- CN105634413A CN105634413A CN201511005206.4A CN201511005206A CN105634413A CN 105634413 A CN105634413 A CN 105634413A CN 201511005206 A CN201511005206 A CN 201511005206A CN 105634413 A CN105634413 A CN 105634413A
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- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- input
- connects
- voltage
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Classifications
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- 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
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses an operational amplifier control circuit. A fixed voltage is supplied to the negative input end of an operational amplifier by using a second resistor and a diode; voltage division is carried out to the input signal at an input port by a first resistor and a fourth resistor; then the input signal is input to the positive input end of the operational amplifier; the input signal is compared through the operational amplifier, is output to the output end of the operational amplifier and is fed back to the positive input end of the operational amplifier; the output voltage is enabled to generate a certain Schmidt characteristic; and the output end of the operation amplifier can generate certain difference value changes aiming at the input voltage level changes.
Description
Technical field
The present invention relates to discharge circuit field, a kind of amplifier pilot circuit of specific design.
Background technology
Amplifier is the abbreviation of operational amplifier; In actual circuit, usually combine feedback network and jointly form certain function module; Owing to being applied in analogue machine in early days, in order to realize mathematical operation, therefore gain the name " operational amplifier ", this title continues so far always; Amplifier is a circuit unit named from the angle of function, it is possible to realize by discrete device, it is also possible to realize in the middle of semi-conductor chip; Along with the development of semiconductor technology, nowadays the amplifier of the overwhelming majority exists with the form of monolithic; Amplifier is of a great variety now, is widely used in the middle of nearly all industry.
Amplifier pilot circuit of today generally has two kinds; The first be directly according to the voltage at input two ends directly after make corresponding high-low voltage and export control signal, this kind of circuit runs into and frequent can change output voltage thus cause control signal generation frequent variations when voltage fluctuates among a small circle; And the 2nd kind is band delays time to control, exporting control signal after the delay more again, this kind of circuit runs into when voltage slowly changes still existence and can change output voltage thus cause control signal to change.
Summary of the invention
It is an object of the invention to provide a kind of amplifier pilot circuit that output voltage still can be made stable when input voltage generation slowly changes among a small circle.
For achieving the above object, the present invention provides a kind of amplifier pilot circuit, comprises the first resistance, the 2nd resistance, the 3rd resistance, the 4th resistance, diode, operational amplifier, circuit power, input port, output port, described input port connects one end of the first resistance, the other end of described first resistance connects the positive input terminal of operational amplifier, the other end of described first resistance also connects one end of the 4th resistance, one end of described 4th resistance also connects one end of described 3rd resistance, the other end of described 3rd resistance also connects the output terminal of operational amplifier, the negative input end of described operational amplifier connects one end of the 2nd resistance, the other end junction circuit power supply of described 2nd resistance, one end of described 2nd resistance also connects the negative pole of diode, the positive pole of described diode, the other end all ground connection of the 4th resistance, the output terminal of described operational amplifier also connects output port, described operational amplifier is single power supply, the positive power source terminal junction circuit power supply of described operational amplifier, the negative power end ground connection of described operational amplifier.
The present invention with the use of the 2nd resistance and diode to negative input end fixed voltage of operational amplifier, input port input signal is input to the positive input terminal of operational amplifier by the first resistance and the 4th electric resistance partial pressure, then the output terminal outputting to operational amplifier is compared by operational amplifier, feeding back to the positive input terminal of operational amplifier, making output voltage produce certain Schmidt's characteristic, the height change of input voltage just can be produced certain difference change by the output terminal of operational amplifier.
The invention has the beneficial effects as follows: 1) adopt this circuit to make the output terminal of operational amplifier that the height change of input voltage is produced certain difference change and make amplifier pilot circuit can not change output voltage when running into voltage and slowly change thus cause control signal to change; 2) operational amplifier is single power supply, it is possible to realize linear amplification, and circuit is simple.
Accompanying drawing explanation
Fig. 1 is the schematic circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
See Fig. 1, a kind of amplifier pilot circuit, comprise the first resistance R1, the 2nd resistance R2, the 3rd resistance R3, the 4th resistance R4, diode Z1, operational amplifier U1A, circuit power VCC, input port Vin, output port Vout, described input port Vin connects one end of the first resistance R1, the other end of described first resistance R1 connects the positive input terminal of operational amplifier U1A, the other end of described first resistance R1 also connects one end of the 4th resistance R4, one end of described 4th resistance R4 also connects one end of described 3rd resistance R3, the other end of described 3rd resistance R3 also connects the output terminal of operational amplifier U1A, the negative input end of described operational amplifier U1A connects one end of the 2nd resistance R2, the other end junction circuit power supply VCC of described 2nd resistance R2, one end of described 2nd resistance R2 also connects the negative pole of diode Z1, the positive pole of described diode Z1, the other end all ground connection of the 4th resistance R4, the output terminal of described operational amplifier U1A also connects output port Vout, described operational amplifier U1A is single power supply, the positive power source terminal junction circuit power supply VCC of described operational amplifier U1A, the negative power end ground connection of described operational amplifier U1A.
In present embodiment, with the use of the 2nd resistance R2 and diode Z1 to operational amplifier U1A negative input end fixed voltage, input port Vin input signal is input to the positive input terminal of operational amplifier U1A by the first resistance R1 and the 4th resistance R4 dividing potential drop, compared the output terminal outputting to operational amplifier U1A by operational amplifier U1A, then feed back to the positive input terminal of operational amplifier U1A; In time inputting port Vin input voltage and be very low, the output terminal of operational amplifier U1A is low voltage, the positive input terminal input voltage of operational amplifier U1A is obtained by the first resistance R1 series connection upper 3rd resistance R3 the 4th resistance R4 in parallel, and with regard to needing, bigger input voltage reaches the input voltage of the negative input end higher than operational amplifier U1A to the positive input terminal input voltage of operational amplifier U1A; When inputting port Vin input voltage height, the output terminal of operational amplifier U1A is high-voltage, the positive input terminal input voltage of operational amplifier U1A is obtained by the upper 4th resistance R4 that then connects of the 3rd resistance R3 in the first resistance R1 parallel connection, and the positive input terminal input voltage of operational amplifier U1A just only needs smaller input voltage to reach the input voltage of the negative input end higher than operational amplifier U1A; The Characteristics Control that such the present invention just can play Schmidt's circuit is input to output waveform; So just can make the output terminal of operational amplifier that the height change of input voltage is produced certain difference change makes amplifier pilot circuit can not change output voltage when running into voltage and slowly change thus cause control signal to change.
Protection scope of the present invention includes but not limited to above enforcement mode, and protection scope of the present invention is as the criterion with claim book, and any replacement that those skilled in the art will find apparent that of this technology being made, distortion, improvement all fall into protection scope of the present invention.
Claims (2)
1. an amplifier pilot circuit, it is characterised in that: comprise the first resistance (R1), the 2nd resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), diode (Z1), operational amplifier (U1A), circuit power (VCC), input port (Vin), output port (Vout), described input port (Vin) connects one end of the first resistance (R1), the other end of described first resistance (R1) connects the positive input terminal of operational amplifier (U1A), the other end of described first resistance (R1) also connects one end of the 4th resistance (R4), one end of described 4th resistance (R4) also connects one end of described 3rd resistance (R3), the other end of described 3rd resistance (R3) also connects the output terminal of operational amplifier (U1A), the negative input end of described operational amplifier (U1A) connects one end of the 2nd resistance (R2), the other end junction circuit power supply (VCC) of described 2nd resistance (R2), one end of described 2nd resistance (R2) also connects the negative pole of diode (Z1), the positive pole of described diode (Z1), the other end all ground connection of the 4th resistance (R4), the output terminal of described operational amplifier (U1A) also connects output port (Vout).
2. a kind of amplifier pilot circuit according to claim 1, it is characterized in that: described operational amplifier (U1A) is single power supply, positive power source terminal junction circuit power supply (VCC) of described operational amplifier (U1A), the negative power end ground connection of described operational amplifier (U1A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511005206.4A CN105634413A (en) | 2015-12-29 | 2015-12-29 | Operational amplifier control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511005206.4A CN105634413A (en) | 2015-12-29 | 2015-12-29 | Operational amplifier control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105634413A true CN105634413A (en) | 2016-06-01 |
Family
ID=56049038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511005206.4A Pending CN105634413A (en) | 2015-12-29 | 2015-12-29 | Operational amplifier control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105634413A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631564A (en) * | 2017-03-20 | 2018-10-09 | 上海派亚电气技术有限公司 | A kind of novel power supply Parallel opertation control circuit |
-
2015
- 2015-12-29 CN CN201511005206.4A patent/CN105634413A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631564A (en) * | 2017-03-20 | 2018-10-09 | 上海派亚电气技术有限公司 | A kind of novel power supply Parallel opertation control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160601 |