CN205302068U - Fixed ampllitude circuit of alternating voltage signal - Google Patents
Fixed ampllitude circuit of alternating voltage signal Download PDFInfo
- Publication number
- CN205302068U CN205302068U CN201620063845.XU CN201620063845U CN205302068U CN 205302068 U CN205302068 U CN 205302068U CN 201620063845 U CN201620063845 U CN 201620063845U CN 205302068 U CN205302068 U CN 205302068U
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- resistance
- operational amplifier
- voltage signal
- output terminal
- coupling mechanism
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Abstract
The utility model provides a fixed ampllitude circuit of alternating voltage signal, includes and carries out amplitude -modulated amplitude modulation unit, carries out the sampling unit that controls to the amplitude modulation volume of amplitude modulation unit oscillator output alternating voltage signal, the oscillator be wien bridge oscillator or LC oscillator, the amplitude modulation unit by an operational amplifier IC1, resistance R1 -R5, optoelectronic coupler GE's photo resistance, constitute together looks proportion operational amplifier, sampling unit by second operation amplifier IC2, resistance R6 -R8, optoelectronic coupler GE's emitting diode, electric capacity C1, diode D1, stabilivolt DW1, constitute a comparison amplifier, resistance that sampling unit adjusted the photo resistance according to output voltage and the skew volume of setting for voltage makes fixed ampllitude circuit of alternating voltage signal output voltage's amplitude reach stably.
Description
Technical field
The utility model relates to the fixed amplitude circuit of a kind of ac voltage signal, and this fixed amplitude circuit is used for vibrator output AC voltage signal is carried out fixed ampllitude.
Background technology
Some instruments are as adopted alternating-current to measure the specific conductivity of solution in conductivity meter, described alternating-current is produced by a vibrator, and in measuring process, the amplitude of the voltage of alternating current that vibrator produces can change, thus makes measuring result error occur. It is therefore desirable to provide a kind of circuit that ac voltage signal is carried out fixed ampllitude.
Summary of the invention
The technical problems to be solved in the utility model is to provide the fixed amplitude circuit of a kind of ac voltage signal, and vibrator output AC voltage signal can be carried out fixed ampllitude by this fixed amplitude circuit.
The fixed amplitude circuit of this ac voltage signal, the sampling unit that the amplitude modulation amount of AM unit comprises the AM unit that vibrator output AC voltage signal is carried out amplitude modulation, control, described vibrator is Wen's bridge oscillator or LC vibrator, it is characterized in that, described AM unit comprises the photovaristor of the first operational amplifier IC1, resistance R1-R5, photoelectricity coupling mechanism GE, the output terminal of vibrator is by the photovaristor ground connection of the resistance R1 of sequential series, resistance R2, photoelectricity coupling mechanism, the node that the in-phase input end of the first operational amplifier IC1 is connected between resistance R1 and resistance R2 by resistance R5, the inverting input of the first operational amplifier IC1, by resistance R4 ground connection, is connected with resistance R3 between the inverting input of the first operational amplifier IC1 and output terminal, described sampling unit comprises the 2nd operational amplifier IC2, resistance R6-R8, the photodiode of photoelectricity coupling mechanism GE, electric capacity C1, diode D1, voltage stabilizing tube DW1, the in-phase input end of the 2nd 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 2nd 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 voltage stabilizing tube DW1 of the 2nd operational amplifier, the plus earth of voltage stabilizing tube DW1, the inverting input of the 2nd operational amplifier meets positive power supply V+ by resistance R7, the output terminal of the 2nd operational amplifier connects the anode of the photodiode of photoelectricity coupling mechanism GE by resistance R6, the plus earth of the photodiode of photoelectricity coupling mechanism 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 photovaristor of photoelectricity coupling mechanism GE, the amplitude change of the fixed amplitude circuit output voltage according to ac voltage signal regulates the resistance of photovaristor, makes the amplitude of the fixed amplitude circuit output voltage of ac voltage signal reach stable.
Accompanying drawing explanation
Fig. 1 is schematic circuit diagram of the present utility model.
Embodiment
Existing accompanying drawings embodiment of the present utility model.
The sampling unit that the fixed amplitude circuit of ac voltage signal comprises the AM unit that vibrator output AC voltage signal carries out amplitude modulation, the amplitude modulation amount of AM unit controlled, described vibrator is classical Wen's bridge oscillator or LC vibrator, and its particular circuit configurations accompanying drawing does not draw.
Described AM unit comprises the photovaristor of the first operational amplifier IC1, resistance R1-R5, photoelectricity coupling mechanism GE; The photovaristor sequential series of resistance R1, R2 and photoelectricity coupling mechanism, forms a dividing potential drop circuit, and the output terminal that one end of resistance R1 is connected to vibrator accepts the output voltage ui of vibrator, one end ground connection of the photovaristor of photoelectricity coupling mechanism; The node that the in-phase input end of the first operational amplifier IC1 is connected between resistance R1 and resistance R2 by resistance R5, the inverting input of the first operational amplifier IC1 is by resistance R4 ground connection, being 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 photovaristor of photoelectricity coupling mechanism reduces, and the output voltage increasing the first operational amplifier when the resistance of the photovaristor of photoelectricity coupling mechanism increases thereupon.
Described sampling unit comprises the 2nd operational amplifier IC2, resistance R6-R8, the photodiode of photoelectricity coupling mechanism GE, electric capacity C1, diode D1, voltage stabilizing tube DW1; The in-phase input end of the 2nd 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 2nd 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 the first operational amplifier is carried out rectification, filtering by diode D1 and electric capacity C1, voltage on electric capacity C1 is sampled voltage, resistance R8 plays earial drainage effect, when output voltage uo becomes low by height, electric capacity C1 is discharged by resistance R8, makes sampled voltage can respond the change of output voltage uo in time; The negative electrode of the anti-phase input termination voltage stabilizing tube DW1 of the 2nd operational amplifier, the plus earth of voltage stabilizing tube DW1, the inverting input of the 2nd operational amplifier meets positive power supply V+ by resistance R7, voltage stabilizing tube DW1 provides a votage reference, the output terminal of the 2nd operational amplifier connects the anode of the photodiode of photoelectricity coupling mechanism GE by resistance R6, the plus earth of the photodiode of photoelectricity coupling mechanism GE.
Positive power supply V+ and negative electricity source 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 deviation setting voltage (the voltage stabilizing value of voltage stabilizing tube DW1) time, biased error is amplified by the 2nd operational amplifier, the electric current of photodiode is adjusted by the output voltage of the 2nd operational amplifier, the resistance of photovaristor 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, owing to the magnification of the 2nd operational amplifier is very big, the output voltage of the first operational amplifier almost equals setting voltage.Therefore the amplitude of the output voltage ui of vibrator 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, the sampling unit that the amplitude modulation amount of AM unit comprises the AM unit that vibrator output AC voltage signal is carried out amplitude modulation, control, described vibrator is Wen's bridge oscillator or LC vibrator, it is characterized in that, described AM unit comprises the photovaristor of the first operational amplifier IC1, resistance R1-R5, photoelectricity coupling mechanism GE; The output terminal of vibrator is by the photovaristor ground connection of the resistance R1 of sequential series, resistance R2, photoelectricity coupling mechanism, the node that the in-phase input end of the first operational amplifier IC1 is connected between resistance R1 and resistance R2 by resistance R5, the inverting input of the first operational amplifier IC1 is by resistance R4 ground connection, being 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 2nd operational amplifier IC2, resistance R6-R8, the photodiode of photoelectricity coupling mechanism GE, electric capacity C1, diode D1, voltage stabilizing tube DW1, the in-phase input end of the 2nd 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 2nd 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 voltage stabilizing tube DW1 of the 2nd operational amplifier, the plus earth of voltage stabilizing tube DW1, the inverting input of the 2nd operational amplifier meets positive power supply V+ by resistance R7, the output terminal of the 2nd operational amplifier connects the anode of the photodiode of photoelectricity coupling mechanism GE by resistance R6, the plus earth of the photodiode of photoelectricity coupling mechanism GE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620063845.XU CN205302068U (en) | 2016-01-24 | 2016-01-24 | Fixed ampllitude circuit of alternating voltage signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620063845.XU CN205302068U (en) | 2016-01-24 | 2016-01-24 | Fixed ampllitude circuit of alternating voltage signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205302068U true CN205302068U (en) | 2016-06-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620063845.XU Expired - Fee Related CN205302068U (en) | 2016-01-24 | 2016-01-24 | Fixed ampllitude circuit of alternating voltage signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205302068U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549667A (en) * | 2016-01-24 | 2016-05-04 | 丁婕 | Amplitude stabilizing circuit for alternating voltage signals |
| CN107647848A (en) * | 2017-09-30 | 2018-02-02 | 温州市人民医院 | A kind of nerve detecting instrument |
-
2016
- 2016-01-24 CN CN201620063845.XU patent/CN205302068U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549667A (en) * | 2016-01-24 | 2016-05-04 | 丁婕 | Amplitude stabilizing circuit for alternating voltage signals |
| CN105549667B (en) * | 2016-01-24 | 2016-12-14 | 丁婕 | A kind of fixed amplitude circuit of ac voltage signal |
| CN107647848A (en) * | 2017-09-30 | 2018-02-02 | 温州市人民医院 | A kind of nerve detecting instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20170124 |