CN202182794U - Double-isolating pressure transmitter circuit - Google Patents
Double-isolating pressure transmitter circuit Download PDFInfo
- Publication number
- CN202182794U CN202182794U CN2011202961541U CN201120296154U CN202182794U CN 202182794 U CN202182794 U CN 202182794U CN 2011202961541 U CN2011202961541 U CN 2011202961541U CN 201120296154 U CN201120296154 U CN 201120296154U CN 202182794 U CN202182794 U CN 202182794U
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- China
- Prior art keywords
- output terminal
- module
- differential amplifier
- current loop
- modular converter
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Abstract
The utility model discloses a double-isolating pressure transmitter circuit includes components such as a foil gauge, a current loop electricity stealing module, a linear optical coupler, a differential amplifier and the like. An output terminal of the foil gauge connects with an input terminal of the differential amplifier and a calibration module. An output terminal of the differential amplifier connects with an inverted input terminal of a first V/I converting module. A first output terminal of the linear optical coupler connects with the inverted input terminal of the first V/I converting module. A second output terminal of the linear optical coupler connects with an inverted input terminal of a second V/I converting module. An output terminal of the second V/I converting module connects with an input terminal of the current loop electricity-stealing module. An output terminal of the current loop electricity stealing module connects with the first V/I converting module. The current loop electricity stealing module supplies power for the first V/I converting module and the differential amplifier. In the utility model, the circuit design is simplified, a real double-isolation function, a linear signal conversion function, and a calibration function are realized, and the stability and anti-interference capability of the circuit are improved.
Description
Technical field
The utility model relates to a kind of pressure transmitter circuit, particularly a kind of pair of isolated form pressure transmitter circuit.
Background technology
Be used in the Industrial Engineering make enterprises such as chemical fibre, rubber, plastics, need its process of producing product be monitored in process of production, in the parameter area of expectation, make with the control product.This just needs pressure unit to be connected to production equipment the production run variable is comprised that pressure, temperature, flow etc. carry out data acquisition, and these data are sent back to central control room, carries out data analysis and handles.And sensor and instrument and meter move suffered various interference at the scene are present all the sensors technical barriers all to be solved.And conventional pressure sensor and central control room adopt the mode of non-isolation to carry out the transmission of signal (curtage), are prone to receive external interference.The way that solves is to use anti-jamming circuit and holding circuit, and the design of anti-jamming circuit and holding circuit is too complicated, and the fault of circuit and cost are difficult to control; Debugging and maintenance difficulty are big; Scrappage is higher, uses high testing apparatus, the manpower and materials of labor.
The utility model content
The utility model technical matters to be solved provides a kind of pair of isolated form pressure transmitter circuit, and it has simplified circuit design, has realized the linear transformation and the calibration function of real two isolation, signal and signal, has increased the stability and the antijamming capability of circuit.
For solveing the technical problem; The utility model provides a kind of pair of isolated form pressure transmitter circuit; It is characterized in that; It comprises foil gauge, electric current loop stealing module, linear optical coupling, differential amplifier, a V/I modular converter, the 2nd V/I modular converter, calibration module; The output terminal of foil gauge links to each other with the input end of differential amplifier, calibration module, and the output terminal of differential amplifier links to each other with the inverting input of a V/I modular converter, and first output terminal of linear optical coupling links to each other with the inverting input of a V/I modular converter; Second output terminal of linear optical coupling links to each other with the inverting input of the 2nd V/I modular converter; The output terminal of the 2nd V/I modular converter links to each other with the input end of electric current loop stealing module, and the output terminal of electric current loop stealing module links to each other with a V/I modular converter, and electric current loop stealing module is a V/I modular converter, differential amplifier power supply.
Preferably, said foil gauge is attached on the elastic body.
The positive progressive effect of the utility model is: the utility model adopts electric current loop stealing module, linear optical coupling and differential amplifier etc. to be combined into two isolated form circuit.The utility model uses integration module; Simplify circuit design, realized the linear transformation and the calibration function of real two isolation the (the two of power supply and power supply, signal and signal isolate), signal and signal, increased the stability and the antijamming capability of circuit; It is stronger to conform; Application is wider, and circuit design is simple simultaneously, fault is few, debugging and easy to maintenance, reduces high testing apparatus and manpower and materials etc.
Description of drawings
Fig. 1 is the theory diagram of the utility model one embodiment.
Embodiment
Lift a preferred embodiment below, and combine accompanying drawing to come the clearer the utility model of intactly explaining.
As shown in Figure 1; The two isolated form pressure transmitter circuits of the utility model comprise foil gauge 1, electric current loop stealing module 2, linear optical coupling 3, differential amplifier 4, a V/I (voltage/current) modular converter 5, the 2nd V/I modular converter 6, calibration module 7; The output terminal of foil gauge 1 links to each other with input end, the calibration module 7 of differential amplifier 4; The output terminal of differential amplifier 4 links to each other with the inverting input of a V/I modular converter 5; First output terminal of linear optical coupling 3 links to each other with the inverting input of a V/I modular converter 5; Second output terminal of linear optical coupling 3 links to each other with the inverting input of the 2nd V/I modular converter 6, and the output terminal of the 2nd V/I modular converter 6 links to each other with the input end of electric current loop stealing module 2, and the output terminal of electric current loop stealing module 2 links to each other with a V/I modular converter.Foil gauge is attached on the elastic body.Electric current loop stealing module 2 is a V/I (voltage/current) modular converter 5, differential amplifier 4 power supplies.
Electric current loop stealing module is a kind ofly directly to steal a kind of special power module that energy forms insulating power supply output and do not influence the signal transmission from current loop, self can consume the certain voltage of loop but can not influence signal magnitude.The separation principle of linear optical coupling and common optocoupler do not have difference, just the single-shot list of common optocoupler are received pattern and change a little, increase an optical receiving circuit that is used to feed back and are used for feedback; Like this, though two optical receiving circuits all are non-linear, the nonlinear characteristic of two optical receiving circuits all is the same, like this, just can offset the non-linear of through path through the non-linear of feedback network, realizes linear purpose of isolating thereby reach.The foil gauge that the two isolated form pressure transmitter circuits of the utility model will be formed full-bridge sticks on the elastic body, during measurement, and the elastic body pressurized; Elastic deformation takes place, and deformation also takes place in the foil gauge that is attached on the elastic body, and strain resistor produces the phenomenon of change in resistance with mechanical deformation; Be commonly called as and be resistance strain effect, and the amplification of carrying out the bridge output voltage signal through differential amplifier, amplifying signal changes into light signal through the transmitting terminal of linear optical coupling; Light action is in two receiving ends of linear optical coupling; Change into voltage signal to light signal, the one tunnel is used for feedback, and one the tunnel is used for V/I transforms current signal commonly used in the outputting standard two-wire system 4-20mA industry.The utility model adopt to be isolated electric current loop stealing module and linear optical coupling, has two isolation features of power supply and power supply, signal and signal, and good stability, antijamming capability are strong, highly sensitive, good linearity, volume are little, low in energy consumption, be easy to advantages such as integrated.The utility model can make transmitter have stronger practicality under the prerequisite that reaches degree of precision and stability, can be directly and computer and PLC host computers such as (programmable logic controllers) carry out remote configuration and control.The utility model adopts two isolation design, makes circuit that superpower antijamming capability arranged, can be under the complicated electromagnetic interference environment of industry steady operation, high reliability makes to be safeguarded simply, practices thrift manpower, the time of labor, has improved user's production efficiency greatly.
The principle of work of the two isolated form pressure transmitter circuits of the utility model is following: when the pressure action of tested flowing fluid during in elastic body, elastic body generation deformation is attached to the foil gauge generation resistance strain effect on the elastic body.Based on Hooke's law; In elastic limit; The deformation of object converts pressure to linear electric signal through the foil gauge on the elastic body with the principle that the external force that causes deformation is directly proportional, and under pressure promptly, elastic body produces micro-deformation; After the foil gauge of its upper end is experienced its deformation; The effect that has a resistance and the output voltage signal that is directly proportional with the applied pressure size amplifies this voltage signal at the two isolated form pressure transmitter circuits via the foil gauge electric connection, and the voltage signal of amplification is exported to linear optical coupling after a V/I modular converter conversion emitter becomes light signal to current conversion; Light signal acts on two receiving ends of linear optical coupling; Light signal converts voltage signal to, and the voltage signal of first output terminal of linear optical coupling feeds back to a V/I modular converter, and the voltage of second output terminal of linear optical coupling carries out the teletransmission process through the direct outputting standard two-wire system of the 2nd V/I modular converter conversion 4-20mA current signal in commercial unit or PLC (programmable logic controller) system.
Though more than described the embodiment of the utility model; But those skilled in the art is to be understood that; These only illustrate, and under the prerequisite of principle that does not deviate from the utility model and essence, can make numerous variations or modification to these embodiments.Therefore, the protection domain of the utility model is limited appended claims.
Claims (2)
1. two isolated form pressure transmitter circuit; It is characterized in that; It comprises foil gauge, electric current loop stealing module, linear optical coupling, differential amplifier, a V/I modular converter, the 2nd V/I modular converter, calibration module; The output terminal of foil gauge links to each other with the input end of differential amplifier, calibration module, and the output terminal of differential amplifier links to each other with the inverting input of a V/I modular converter, and first output terminal of linear optical coupling links to each other with the inverting input of a V/I modular converter; Second output terminal of linear optical coupling links to each other with the inverting input of the 2nd V/I modular converter; The output terminal of the 2nd V/I modular converter links to each other with the input end of electric current loop stealing module, and the output terminal of electric current loop stealing module links to each other with a V/I modular converter, and electric current loop stealing module is a V/I modular converter, differential amplifier power supply.
2. as claimed in claim 1 pair of isolated form pressure transmitter circuit is characterized in that said foil gauge is attached on the elastic body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202961541U CN202182794U (en) | 2011-08-15 | 2011-08-15 | Double-isolating pressure transmitter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202961541U CN202182794U (en) | 2011-08-15 | 2011-08-15 | Double-isolating pressure transmitter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202182794U true CN202182794U (en) | 2012-04-04 |
Family
ID=46175827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202961541U Withdrawn - After Issue CN202182794U (en) | 2011-08-15 | 2011-08-15 | Double-isolating pressure transmitter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202182794U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937499A (en) * | 2011-08-15 | 2013-02-20 | 上海朝辉压力仪器有限公司 | Double-isolation type pressure transmitter circuit |
-
2011
- 2011-08-15 CN CN2011202961541U patent/CN202182794U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937499A (en) * | 2011-08-15 | 2013-02-20 | 上海朝辉压力仪器有限公司 | Double-isolation type pressure transmitter circuit |
| CN102937499B (en) * | 2011-08-15 | 2014-11-19 | 上海朝辉压力仪器有限公司 | Double-isolation type pressure transmitter circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120404 Effective date of abandoning: 20141119 |
|
| RGAV | Abandon patent right to avoid regrant |