CN105549667A - Amplitude stabilizing circuit for alternating voltage signals - Google Patents
Amplitude stabilizing circuit for alternating voltage signals Download PDFInfo
- Publication number
- CN105549667A CN105549667A CN201610043458.4A CN201610043458A CN105549667A CN 105549667 A CN105549667 A CN 105549667A CN 201610043458 A CN201610043458 A CN 201610043458A CN 105549667 A CN105549667 A CN 105549667A
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- China
- Prior art keywords
- resistance
- operational amplifier
- oscillator
- output terminal
- photoelectrical coupler
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- 230000000087 stabilizing effect Effects 0.000 title abstract description 5
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
- G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
An amplitude stabilizing circuit for alternating voltage signals comprises an amplitude modulation unit used for carrying out amplitude modulation on the alternating voltage signals output by an oscillator, and a sampling unit used for controlling the amplitude modulation amount of the amplitude modulation unit. The oscillator is a Wien-bridge-type oscillator or an LC oscillator. The amplitude modulation unit is composed of a first operation amplifier IC1, resistors R1-R5 and a photoconductive resistor of a photoelectric coupler GE, and an in-phase proportion operation amplifier is formed; the sampling unit is composed of a second operation amplifier IC2, resistors R6-R8, a light-emitting diode of the photoelectric coupler GE, a capacitor C1, a diode D1 and a voltage stabilizing tube DW1, and a comparison amplifier is formed. The sampling unit regulates the resistance value of the photoconductive resistor according to the deviation of output voltage and set voltage, and thus the amplitude value of the output voltage of the amplitude stabilizing circuit for the alternating voltage signals can be stable.
Description
Technical field
The present invention relates to a kind of fixed amplitude circuit of ac voltage signal, this fixed amplitude circuit is used for carrying out fixed ampllitude to oscillator output AC voltage signal.
Background technology
Some instruments are as adopted alternating current to measure the conductivity of solution in conductivity meter, described alternating current is produced by an oscillator, and in measuring process, the amplitude of the alternating voltage that oscillator produces can change, thus makes measurement result occur error.Therefore be necessary to provide a kind of circuit ac voltage signal being carried out to fixed ampllitude.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of fixed amplitude circuit of ac voltage signal, and this fixed amplitude circuit can carry out fixed ampllitude to oscillator output AC voltage signal.
The fixed amplitude circuit of this ac voltage signal, comprise AM unit oscillator output AC voltage signal being carried out to amplitude modulation, to the sampling unit that the amplitude modulation amount of AM unit controls, described oscillator is Wien-Bridge oscillator or LC oscillator, it is characterized in that, described AM unit comprises the first operational amplifier IC1, resistance R1-R5, the photoresistance of photoelectrical coupler GE, the output terminal of oscillator passes through the resistance R1 of sequential series, resistance R2, the photoresistance ground connection of photoelectrical coupler, the in-phase input end of the first operational amplifier IC1 is connected to the node between resistance R1 and resistance R2 by resistance R5, the inverting input of the first operational amplifier IC1 is by resistance R4 ground connection, resistance R3 is connected with between the inverting input of the first operational amplifier IC1 and output terminal, described sampling unit comprises the second operational amplifier IC2, resistance R6-R8, the light emitting diode of photoelectrical coupler GE, electric capacity C1, diode D1, stabilivolt DW1, the in-phase input end of the second operational amplifier connects the negative electrode of diode D1, the anode of diode D1 connects the output terminal of the first operational amplifier, the in-phase input end of the second operational amplifier is by electric capacity C1 ground connection, the two ends of electric capacity C1 are parallel with resistance R8, the negative electrode of the anti-phase input termination stabilivolt DW1 of the second operational amplifier, the plus earth of stabilivolt DW1, the inverting input of the second operational amplifier meets positive supply V+ by resistance R7, the output terminal of the second operational amplifier connects the anode of the light emitting diode of photoelectrical coupler GE by resistance R6, the plus earth of the light emitting diode of photoelectrical coupler GE, the output terminal of the first operational amplifier is the output terminal of the fixed amplitude circuit of described ac voltage signal.
The feature of the fixed amplitude circuit of this ac voltage signal is, use the controllability of the photoresistance of photoelectrical coupler GE, regulate the resistance of photoresistance according to the amplitude change of the fixed amplitude circuit output voltage of ac voltage signal, make the amplitude of the fixed amplitude circuit output voltage of ac voltage signal reach stable.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Existing accompanying drawings the specific embodiment of the present invention.
The fixed amplitude circuit of ac voltage signal comprises the AM unit carrying out amplitude modulation to oscillator output AC voltage signal, the sampling unit controlled the amplitude modulation amount of AM unit, described oscillator is classical Wien-Bridge oscillator or LC oscillator, and its particular circuit configurations accompanying drawing does not draw.
Described AM unit comprises the photoresistance of the first operational amplifier IC1, resistance R1-R5, photoelectrical coupler GE; The photoresistance sequential series of resistance R1, R2 and photoelectrical coupler, forms a bleeder circuit, and the output terminal that one end of resistance R1 is connected to oscillator accepts the output voltage ui of oscillator, one end ground connection of the photoresistance of photoelectrical coupler; The in-phase input end of the first operational amplifier IC1 is connected to the node between resistance R1 and resistance R2 by resistance R5, the inverting input of the first operational amplifier IC1 is by resistance R4 ground connection, be connected with resistance R3 between the inverting input of the first operational amplifier IC1 and output terminal, the first operational amplifier and resistance R3-R5 form an in-phase proportion operation amplifier circuit; The output voltage reducing the first operational amplifier when the resistance of the photoresistance of photoelectrical coupler reduces, and the output voltage increasing the first operational amplifier when the resistance of the photoresistance of photoelectrical coupler increases thereupon.
Described sampling unit comprises the second operational amplifier IC2, resistance R6-R8, the light emitting diode of photoelectrical coupler GE, electric capacity C1, diode D1, stabilivolt DW1; The in-phase input end of the second operational amplifier connects the negative electrode of diode D1, and the anode of diode D1 connects the output terminal of the first operational amplifier, and the in-phase input end of the second operational amplifier is by electric capacity C1 ground connection, and the two ends of electric capacity C1 are parallel with resistance R8; The output voltage uo of diode D1 and electric capacity C1 to the first operational amplifier carries out rectification, filtering, voltage on electric capacity C1 is sampled voltage, resistance R8 plays earial drainage effect, when output voltage uo is discharged by resistance R8 by electric capacity C1 during high step-down, make sampled voltage can respond the change of output voltage uo in time; The negative electrode of the anti-phase input termination stabilivolt DW1 of the second operational amplifier, the plus earth of stabilivolt DW1, the inverting input of the second operational amplifier meets positive supply V+ by resistance R7, stabilivolt DW1 provides a reference voltage, the output terminal of the second operational amplifier connects the anode of the light emitting diode of photoelectrical coupler GE, the plus earth of the light emitting diode of photoelectrical coupler GE by resistance R6.
Positive supply V+ and negative supply V-is the working power of the fixed amplitude circuit of ac voltage signal.
The principle of work of the fixed amplitude circuit of ac voltage signal is, as output voltage uo once when departing from setting voltage (the voltage stabilizing value of stabilivolt DW1), second operational amplifier amplifies biased error, the electric current of output voltage to light emitting diode of the second operational amplifier adjusts, the resistance of photoresistance is changed, thus change the input voltage of the first operational amplifier, make the output voltage uo of the first operational amplifier a little less than setting voltage, because the enlargement factor of the second operational amplifier is very large, the output voltage of the first operational amplifier is no better than setting voltage.Therefore the amplitude of the output voltage ui of oscillator changes or pull-up resistor RZ changes output voltage uo can not be made to change.
Claims (1)
1. the fixed amplitude circuit of an ac voltage signal, comprise the AM unit that amplitude modulation is carried out to oscillator output AC voltage signal, the sampling unit that the amplitude modulation amount of AM unit is controlled, described oscillator is Wien-Bridge oscillator or LC oscillator, it is characterized in that, described AM unit comprises the photoresistance of the first operational amplifier IC1, resistance R1-R5, photoelectrical coupler GE; The output terminal of oscillator is by resistance R1, the resistance R2 of sequential series, the photoresistance ground connection of photoelectrical coupler, the in-phase input end of the first operational amplifier IC1 is connected to the node between resistance R1 and resistance R2 by resistance R5, the inverting input of the first operational amplifier IC1 is by resistance R4 ground connection, be connected with resistance R3 between the inverting input of the first operational amplifier IC1 and output terminal, the output terminal of the first operational amplifier is the output terminal of the fixed amplitude circuit of described ac voltage signal;
Described sampling unit comprises the second operational amplifier IC2, resistance R6-R8, the light emitting diode of photoelectrical coupler GE, electric capacity C1, diode D1, stabilivolt DW1, the in-phase input end of the second operational amplifier connects the negative electrode of diode D1, the anode of diode D1 connects the output terminal of the first operational amplifier, the in-phase input end of the second operational amplifier is by electric capacity C1 ground connection, the two ends of electric capacity C1 are parallel with resistance R8, the negative electrode of the anti-phase input termination stabilivolt DW1 of the second operational amplifier, the plus earth of stabilivolt DW1, the inverting input of the second operational amplifier meets positive supply V+ by resistance R7, the output terminal of the second operational amplifier connects the anode of the light emitting diode of photoelectrical coupler GE by resistance R6, the plus earth of the light emitting diode of photoelectrical coupler GE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610043458.4A CN105549667B (en) | 2016-01-24 | 2016-01-24 | A kind of fixed amplitude circuit of ac voltage signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610043458.4A CN105549667B (en) | 2016-01-24 | 2016-01-24 | A kind of fixed amplitude circuit of ac voltage signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105549667A true CN105549667A (en) | 2016-05-04 |
| CN105549667B CN105549667B (en) | 2016-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610043458.4A Active CN105549667B (en) | 2016-01-24 | 2016-01-24 | A kind of fixed amplitude circuit of ac voltage signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105549667B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249050A (en) * | 2016-10-29 | 2016-12-21 | 高玉琴 | A kind of high resistance measuring instrument |
| CN106249051A (en) * | 2016-10-29 | 2016-12-21 | 高玉琴 | Electronic megger |
| CN109173054A (en) * | 2018-10-17 | 2019-01-11 | 丁毅 | A kind of potential therapeutic instrument |
| CN110132118A (en) * | 2019-06-13 | 2019-08-16 | 重庆红江机械有限责任公司 | A kind of displacement detection system based on LVDT sensor |
Citations (6)
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|---|---|---|---|---|
| CN1104002A (en) * | 1993-12-15 | 1995-06-21 | 许天昀 | Method for controlling resonance power conversion |
| US20010033190A1 (en) * | 1999-09-20 | 2001-10-25 | Bendall Clark Alexander | Analog voltage isolation circuit |
| CN102332864A (en) * | 2011-09-29 | 2012-01-25 | 北京经纬恒润科技有限公司 | Sine wave oscillation circuit |
| WO2012044575A2 (en) * | 2010-09-30 | 2012-04-05 | Osram Sylvania Inc. | Full wave current sense rectifier |
| CN103684262A (en) * | 2013-12-20 | 2014-03-26 | 北京遥测技术研究所 | Sine-wave quartz crystal oscillator based on analog circuit |
| CN205302068U (en) * | 2016-01-24 | 2016-06-08 | 丁婕 | Fixed ampllitude circuit of alternating voltage signal |
-
2016
- 2016-01-24 CN CN201610043458.4A patent/CN105549667B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1104002A (en) * | 1993-12-15 | 1995-06-21 | 许天昀 | Method for controlling resonance power conversion |
| US20010033190A1 (en) * | 1999-09-20 | 2001-10-25 | Bendall Clark Alexander | Analog voltage isolation circuit |
| WO2012044575A2 (en) * | 2010-09-30 | 2012-04-05 | Osram Sylvania Inc. | Full wave current sense rectifier |
| CN102332864A (en) * | 2011-09-29 | 2012-01-25 | 北京经纬恒润科技有限公司 | Sine wave oscillation circuit |
| CN103684262A (en) * | 2013-12-20 | 2014-03-26 | 北京遥测技术研究所 | Sine-wave quartz crystal oscillator based on analog circuit |
| CN205302068U (en) * | 2016-01-24 | 2016-06-08 | 丁婕 | Fixed ampllitude circuit of alternating voltage signal |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249050A (en) * | 2016-10-29 | 2016-12-21 | 高玉琴 | A kind of high resistance measuring instrument |
| CN106249051A (en) * | 2016-10-29 | 2016-12-21 | 高玉琴 | Electronic megger |
| CN109173054A (en) * | 2018-10-17 | 2019-01-11 | 丁毅 | A kind of potential therapeutic instrument |
| CN109173054B (en) * | 2018-10-17 | 2023-11-03 | 丁毅 | Potential therapeutic instrument |
| CN110132118A (en) * | 2019-06-13 | 2019-08-16 | 重庆红江机械有限责任公司 | A kind of displacement detection system based on LVDT sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105549667B (en) | 2016-12-14 |
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Effective date of registration: 20240428 Address after: No. 226, Liqizhuang Village, Liqizhuang Town, Sanhe City, Hebei Province, 065200 Patentee after: Liu Ying Country or region after: China Address before: 225500 room c2-304, Jindu International Garden, Luotang street, Jiangyan District, Taizhou City, Jiangsu Province Patentee before: Ding Jie Country or region before: China |
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