CN102778327A - High-performance intelligent sensor digital transmitting system - Google Patents
High-performance intelligent sensor digital transmitting system Download PDFInfo
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- CN102778327A CN102778327A CN2012102308060A CN201210230806A CN102778327A CN 102778327 A CN102778327 A CN 102778327A CN 2012102308060 A CN2012102308060 A CN 2012102308060A CN 201210230806 A CN201210230806 A CN 201210230806A CN 102778327 A CN102778327 A CN 102778327A
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Abstract
The invention discloses a high-performance intelligent sensor digital transmitting system. The system comprises a sensor, wherein a signal output end of the sensor is connected with an input end of a main processor unit through a small signal distortionless amplifying circuit; a second input/output end of the main processor unit is connected with a first input/output end of a digital isolator; a second input/output end of the digital isolator is connected with a transmitter interface of an RS485 bus processor; a third input/output end of the main processor unit is connected with the transmitter through a 4-20mA loop signal and a 4-20mA isolator piece; a power supply processing module is used for providing a voltage of a current source; the main processor unit is used for optimizing parameters, subsequently displaying on a liquid crystal display module, and uploading the data to a bus through the RS485 bus processor; and moreover the data are converted into two-wire system 4-20mA loop signals by using a modified pressure value. The system provided by the invention has the advantages of high precision and intelligence.
Description
Technical field
The present invention relates to pressure transducer transmitter technical field, particularly a kind of high-performance, intelligence sensor numeral transmitting system.
Background technology
Transmitter is a kind of pick-up unit that is widely used in petrochemical industry.The function of transmitter mainly is the electric signal that the dissimilar non-electrical signals of pressure transducer output is changed into industrial standard, like 4-20mA current signal, 1-5V voltage signal.Through this type of conversion, receivable analog quantity electric signal just can be transferred on hundreds of the rice outer pulpit or display device.
Existing pressure transducer transmitter mainly realizes pressure signal is changed into the function of electric signal, but the precision of this type of transmitter is generally lower.Because the linearity that output showed of pressure transducer under different temperature is different, the existence that temperature is floated makes the output of sensor itself have nonlinear feature.Bring temperature into through the signal of traditional transmitter conversion and floated, greatly reduced the precision of transmitter.Both at home and abroad relevant industries are devoted to study the solution of the problem of floating to temperature always, do not float problem but existing transmitter industry proposes the temperature that a kind of intelligent transfer mode comparatively reliably solves sensor as yet.
Summary of the invention
In order to overcome the defective of above-mentioned prior art, the object of the present invention is to provide a kind of high-performance, intelligence sensor numeral transmitting system, have high precision, high-performance, intelligentized advantage.
In order to achieve the above object, the technical scheme taked of the present invention is:
A kind of high-performance, intelligence sensor numeral transmitting system; Comprise sensor 1; The signal output part of sensor 1 is connected with the input end of the undistorted amplifying circuit 2 of small-signal; Small-signal is undistorted, and the output terminal of amplifying circuit 2 and the input end of main processor unit 3 are connected; The first I/O end of main processor unit 3 is connected with Liquid Crystal Module 4; Second I/O end of main processor unit 3 and the first I/O end of digital isolator 5 are connected, and the second I/O end of digital isolator 5 is connected with the transmitter interface through RS485 bus processor 7, and the 3rd I/O end of main processor unit 3 and the I/O end of 4-20mA loop signal 6 are connected; The output terminal of 4-20mA loop signal 6 is connected with the input end of 4-20mA isolating device 8; The output terminal of 4-20mA isolating device 8 is connected with the transmitter interface, and the power input of power management module 9 and sensor 1, small-signal is undistorted amplifying circuit 2, main processor unit 3 is connected, and power circuit protection 11 is connected power management module 9 through isolated from power 10 and before isolating; The final transmitter interface that inserts, power management module 9 and isolated from power 10, the preceding power circuit protection 11 common power supply processing modules 12 of forming of isolation.
Described main processor unit 3 adopts ATMEGA128L, utilizes the least square regression algorithm that the signal that sensor 1 is sent is carried out intelligent compensation, utilizes host computer proving operation software that original signal is revised.
Described power management module 9 adopts Ultra-High-Precision, Ultra-Low-Noise, and Series Voltage Reference provides as the voltage of constant current source, and maximum noise is 1.3 μ VP-P, and switching noise is 35nV/ √ Hz.
Good reliability of the present invention, measuring accuracy is high, has effectively promoted the system accuracy of sensor.Simultaneously, the present invention should have good Electro Magnetic Compatibility, and its Electro Magnetic Compatibility index should satisfy GJB151A-1997 " military equipment and subsystem Electromagnetic Launching and susceptibility require ".
Description of drawings
Fig. 1 is a system architecture synoptic diagram of the present invention.
Fig. 2-(a) is main processor unit 3 circuit diagrams, and Fig. 2-(b) is the circuit diagram of undistorted amplifying circuit 2 of small-signal and 4-20mA loop signal 6, and 2-(c) is the circuit diagram of power supply processing module 12.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
With reference to Fig. 1; A kind of high-performance, intelligence sensor numeral transmitting system comprise sensor 1, and the signal output part of sensor 1 is connected with the input end of the undistorted amplifying circuit 2 of small-signal; Original signal is modulated into the 4-20mA current signal of industrial standard through the undistorted amplifying circuit 2 of small-signal; Small-signal is undistorted, and the output terminal of amplifying circuit 2 and the input end of main processor unit 3 are connected, and the signal after the modulation inserts main processor unit 3, and the first I/O end of main processor unit 3 is connected with Liquid Crystal Module 4; Signal carries out corresponding compensation in main processor unit 3 after; Output on the Liquid Crystal Module 4 in order to show that the second I/O end of main processor unit 3 and the first I/O end of digital isolator 5 are connected, the second I/O end of digital isolator 5 passes through RS485 bus processor 7 and is connected with the transmitter interface; Signal after Main Processor Unit 3 will be handled through digital isolator 5 sends to the transmitter interface through RS485 bus processor 7; To feed to master station's communication, the 3rd I/O end of main processor unit 3 and the I/O end of 4-20mA loop signal 6 are connected, and the output terminal of 4-20mA loop signal 6 is connected with the input end of 4-20mA isolating device 8; The output terminal of 4-20mA isolating device 8 is connected with the transmitter interface; Electric signal after will modulating through 4-20mA loop signal 6 sends to the transmitter interface, makes transmitter can send the accurate 4-20mA electric signal of a road sign and uses for expansion, between 4-20mA loop signal 6 and the transmitter interface 4-20mA isolating device 8 is arranged; Digital signal and simulating signal in the circuit are isolated fully; Improve the signal to noise ratio (S/N ratio) of signal, the power input of power management module 9 and sensor 1, small-signal is undistorted amplifying circuit 2, main processor unit 3 is connected, and to sensor 1, small-signal is undistorted amplifying circuit 2, main processor unit 3 corresponding stabilized power source is provided through power management module 9; Power management module 9 is connected through the preceding power circuit protection 11 of isolated from power 10 and isolation; The final transmitter interface that inserts owing to having added isolated from power 10 protection modules, has promoted the stability of power supply; Reduced the ripple noise of power supply, power management module 9 and isolated from power 10, the preceding power circuit protection 11 common power supply processing modules 12 of forming of isolation.
With reference to Fig. 2-(a); Described main processor unit 3 has been selected ATMEGA128L for use; Utilize the least square regression algorithm that the signal that sensor 1 is sent is carried out intelligent compensation, utilize host computer proving operation software that original signal is revised, according to certain frequency sampling; Main processor unit 3 is presented at sampled data on the LCD MODULE 4 after according to the parameter optimization of revising; And upload the data on the bus through RS-485 bus processor 7, and utilize revised force value to convert two-wire system 4-20mA loop signal 6 to, calibration system is calibration sensor intelligent digital transmitter and can effectively promote the system accuracy of sensor easily.The inner least square regression algorithm that adopts of single-chip microcomputer carries out linear compensation to the output of sensor, adopts many temperature spots multiple pressure force to demarcate, and between adjacent two temperature spots, carries out match again, thereby makes transmitter reach full accuracy in the total temperature scope.
ATMEGA128L is a kind of high-performance single-chip microcomputer, adopts its inner 1 tunnel 16 high-speed a/d converter and 1 tunnel 10 A/D converter, and one tunnel acquired signal one tunnel is gathered baseline; Adopt 2 tunnel 12 D/A converters, the output of one tunnel control baseline, one tunnel control, 4 ~ 20mA signal.The high-precision high-speed analog to digital converter be high precision transmitter (0.1%FS or 0.05%FS) provide maybe, its inner integrated 64KFLASH storer has been cancelled the outside EEPROM that is used for data table memory in addition, has simplified external circuit.
With reference to Fig. 2-(b), this figure is the circuit diagram of undistorted amplifying circuit 2 of small-signal and 4-20mA loop signal 6.Native system is selected high performance front-end amplifier for use, improves the inhibition ability of amplifying circuit to interference noise.Adopt low-pass filter to suppress high frequency interference, adopt the instrument amplifier of high cmrr to suppress common mode interference.Automatically the method for baseline adopts the reference edge of 12 D/A control instrument amplifiers, thereby realizes the inhibition of temperature drift, baseline wander, linear drift automatically.Instrument amplifier adopts the AD623 of U.S. ADI company, and its common-mode rejection ratio is greater than 90dB.Precision amplifier adopts the OPA335 of American TI Company.
With reference to Fig. 2-(c), this figure is the circuit diagram of power supply processing module 12.Circuit protection designs such as anti-thunderbolt, surge inhibition have been added in this design, make that the stability of native system is more remarkable, under extreme environment, can guarantee the normal operation of system.Described power management module 9 adopts Ultra-High-Precision, Ultra-Low-Noise, and Series Voltage Reference provides as the voltage of constant current source, and maximum noise is 1.3 μ VP-P, and switching noise is 35nV/ √ Hz.
Principle of work of the present invention is:
With reference to Fig. 1, the signal that a kind of high-performance, intelligence sensor numeral transmitting system are sent through receiving sensor 1 is modulated into the electric signal that main processor unit 3 can be used with signal through the undistorted amplifying circuit 2 of small-signal.The technical indicator of amplifying circuit is frequency analog signal response 0.01 ~ 100KHz, conjugated analoging systeming ratio>90dB, input impedance>5M Ω, input dynamic range 0 ~ 500mV, SF 1MHz.Amplifying circuit adopts three grades of structure for amplifying, and the enlargement factor of each grade all is not more than 10 times, and first order instrument amplifier enlargement factor is 5 times, and its effect mainly is to convert differential signal to mono signal, and the conjugated analoging systeming ratio of 90dB is provided.Second level amplifier adopts reverse input, and enlargement factor is 2 times, and its effect mainly is to form a low-pass filter, and signal to noise ratio (S/N ratio) is significantly promoted.Third level amplifier adopts reverse input, and enlargement factor is 10 times, and its effect mainly is that signal amplifies, and converts reverse signal to forward signal, at last signal is carried out filter shape, and offers the 16-bitA/D converter.
After main processor unit 3 is demarcated through upper computer software, with being presented on the Liquid Crystal Module 4 after the parameter optimization of the signal that receives through the sampled data correction.The correction of data utilizes the least square regression fitting algorithm.Adopt many temperature spots multiple pressure force to demarcate, between adjacent two temperature spots, carry out match again, thereby make transmitter reach full accuracy in the total temperature scope.Simultaneously, this intelligent digital transmitting system also through RS485 bus processor 7, sends the current pressure value that is collected according to certain agreement, can be used for remote monitoring.In addition, the intelligent digital transmitting system also pressure signal is modulated into industrial standard through 4-20mA loop signal 6,4-20mA isolating device 8 the 4-20mA current signal in order to output.
The present invention adopts constant current source as excitation, and whether system's constant current source design precisely is directly connected to the accuracy of pressure transducer acquired signal.The present invention adopts Ultra-High-Precision, Ultra-Low-Noise, and Series Voltage Reference provides as the voltage of constant current source, and maximum noise is 1.3 μ VP-P, and switching noise is 35nV/ √ Hz.Simultaneously, the native system circuit protection adopts three grades of lightning surge protection circuits, and its protective capacities meets and surpasses IEC61000-4-5, and ITU-T K20/K21 and GB GB9043 are all relevant for lightning surge immunity to interference testing standard.The highest testing standard of its communication line is 10/700us, 4KV.10/700us is the lightning voltage waveform that induces in the communication line, and it is that the time is 10us that expression rises to peak value from null value, drops to the half the 700us of being of peak value.
Claims (3)
1. a high-performance, intelligence sensor numeral transmitting system; Comprise sensor (1); It is characterized in that: the signal output part of sensor (1) is connected with the input end of the undistorted amplifying circuit of small-signal (2); The output terminal of the undistorted amplifying circuit of small-signal (2) is connected with the input end of main processor unit (3); The first I/O end of main processor unit (3) is connected with Liquid Crystal Module (4); The second I/O end of main processor unit (3) is connected with the first I/O end of digital isolator (5); The second I/O end of digital isolator (5) is connected with the transmitter interface through RS485 bus processor (7); The 3rd I/O end of main processor unit (3) is connected with the I/O end of 4-20mA loop signal (6), and the output terminal of 4-20mA loop signal (6) is connected with the input end of 4-20mA isolating device (8), and the output terminal of 4-20mA isolating device (8) is connected with the transmitter interface; Power management module (9) is connected with the power input of sensor (1), the undistorted amplifying circuit of small-signal (2), main processor unit (3); Power management module (9) protects (11) to be connected through isolated from power (10) with isolating preceding power circuit, finally inserts the transmitter interface, and power circuit protects (11) to form power supply processing module (12) jointly before power management module (9) and isolated from power (10), the isolation.
2. a kind of high-performance according to claim 1, intelligence sensor numeral transmitting system; It is characterized in that: described main processor unit (3) adopts ATMEGA128L; Utilize the least square regression algorithm that the signal that sensor (1) is sent is carried out intelligent compensation, utilize host computer proving operation software that original signal is revised.
3. a kind of high-performance according to claim 1, intelligence sensor numeral transmitting system; It is characterized in that: described power management module (9) adopts Ultra-High-Precision; Ultra-Low-Noise; Series Voltage Reference provides as the voltage of constant current source, and maximum noise is 1.3 μ VP-P, and switching noise is 35nV/ √ Hz.
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| CN2012102308060A CN102778327A (en) | 2012-07-05 | 2012-07-05 | High-performance intelligent sensor digital transmitting system |
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| CN2012102308060A CN102778327A (en) | 2012-07-05 | 2012-07-05 | High-performance intelligent sensor digital transmitting system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308240A (en) * | 2013-05-22 | 2013-09-18 | 德讯科技股份有限公司 | High-precision digital air pressure measuring circuit based on industrial 485 bus |
| CN104155891A (en) * | 2014-07-03 | 2014-11-19 | 华南理工大学 | I<2>C-based networked transmitter and communication implementation method thereof |
| CN104869518A (en) * | 2015-06-04 | 2015-08-26 | 湖南康通电子科技有限公司 | Wall-mounted loud-speaking talkback terminal and loud-speaking talkback system |
| CN113340516A (en) * | 2021-06-07 | 2021-09-03 | 中国工程物理研究院总体工程研究所 | Pressure measuring cell |
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| US20030056597A1 (en) * | 2001-08-23 | 2003-03-27 | Rongtai Wang | Three-phase excitation circuit for compensated capacitor industrial process control transmitters |
| CN2624198Y (en) * | 2003-04-28 | 2004-07-07 | 张川潮 | Intelligent differential pressure transmitter |
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| CN201622146U (en) * | 2010-03-12 | 2010-11-03 | 淄博飞雁先行测控技术有限公司 | Low power consumption two-wire system 4-20mA output pressure transmitter circuit |
| CN102446406A (en) * | 2011-10-24 | 2012-05-09 | 山东佰测仪表有限公司 | Novel separated pressure transmitter |
| CN202268070U (en) * | 2011-10-24 | 2012-06-06 | 山东佰测仪表有限公司 | Novel isolated pressure transmitter |
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2012
- 2012-07-05 CN CN2012102308060A patent/CN102778327A/en active Pending
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| JPH05113379A (en) * | 1991-10-22 | 1993-05-07 | Shimadzu Corp | Pressure/differential pressure transmitter |
| JPH09212787A (en) * | 1996-02-01 | 1997-08-15 | Hitachi Ltd | Intelligent transmitter |
| US20030056597A1 (en) * | 2001-08-23 | 2003-03-27 | Rongtai Wang | Three-phase excitation circuit for compensated capacitor industrial process control transmitters |
| CN2624198Y (en) * | 2003-04-28 | 2004-07-07 | 张川潮 | Intelligent differential pressure transmitter |
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| CN201540183U (en) * | 2009-09-03 | 2010-08-04 | 深圳江元自控科技有限公司 | Digital wind pressure transmitter |
| CN201622146U (en) * | 2010-03-12 | 2010-11-03 | 淄博飞雁先行测控技术有限公司 | Low power consumption two-wire system 4-20mA output pressure transmitter circuit |
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| CN202268070U (en) * | 2011-10-24 | 2012-06-06 | 山东佰测仪表有限公司 | Novel isolated pressure transmitter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308240A (en) * | 2013-05-22 | 2013-09-18 | 德讯科技股份有限公司 | High-precision digital air pressure measuring circuit based on industrial 485 bus |
| CN103308240B (en) * | 2013-05-22 | 2015-06-10 | 德讯科技股份有限公司 | High-precision digital air pressure measuring circuit based on industrial 485 bus |
| CN104155891A (en) * | 2014-07-03 | 2014-11-19 | 华南理工大学 | I<2>C-based networked transmitter and communication implementation method thereof |
| CN104869518A (en) * | 2015-06-04 | 2015-08-26 | 湖南康通电子科技有限公司 | Wall-mounted loud-speaking talkback terminal and loud-speaking talkback system |
| CN113340516A (en) * | 2021-06-07 | 2021-09-03 | 中国工程物理研究院总体工程研究所 | Pressure measuring cell |
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Application publication date: 20121114 |