CN102564530B - A kind of intelligence 4~20mA two-wire system photoelectricity level transmitters - Google Patents
A kind of intelligence 4~20mA two-wire system photoelectricity level transmitters Download PDFInfo
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- CN102564530B CN102564530B CN201110411608.XA CN201110411608A CN102564530B CN 102564530 B CN102564530 B CN 102564530B CN 201110411608 A CN201110411608 A CN 201110411608A CN 102564530 B CN102564530 B CN 102564530B
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Abstract
The present invention relates to a kind of intelligence 4~20mA two-wire system photoelectricity level transmitters, it is characterised in that：Including processor, and power-switching circuit, photoelectric sensor control detection unit, D/A converter and the HART communication unit being connected with processor；Wherein, processor control collection photoelectric sensor control detection unit is so as to obtain liquid level signal, the liquid level signal is converted to 4~20mA standard signals by D/A converter, Bell202 international standard protocols are met in 4~20mA carrier waves by HART communication unit simultaneously, the bi-directional digital communication between transmitter and control room is realized.It has low-power consumption, supply district wide, there is super error correction ability to sensing data, and reliability is high, the advantages of reducing the maintenance intensity of Field Force.
Description
Technical field
The present invention relates to a kind of intelligence 4~20mA two-wire system photoelectricity level transmitters.
Background technology
Steel band level meter applies quite varied in oil product storage tank measurement, and infrared light fax is used in steel band level meter
The mode of sensor detection liquid level is most.At present at the scene in automated information managing and control system, the application of 4~20mA signals is obtained
To generally accepting, the steel band level meter with 4~20mA outputs is also more and more to be used widely.But in current use
Optoelectronic liquid level transducer is because the limitation of process circuit, transmitter generally uses three-wire system, wherein two are power supply, one
For 4~20mA signal outputs, the circuit operating conditions require higher and there are shortcomings and deficiency：There is intrinsic safe explosion-proof requirement
Field of employment because transmitter requires that supply voltage is big compared with high, operating current, apolegamy guard grating is extremely difficult；Transmitter three
The working method of line also results in the increase of field engineering cable cost；Transmitter is under 4~20mA three-wire system output forms
There is no the HART digital interfaces of carrier wave, bidirectional data transfers can not be realized with control room, instrument is difficult in maintenance；Transmitter liquid level is examined
The infrared photoelectric sensor key component of survey is handled using common gate circuit inherent logic, and corrupt data rate is high；Transmitter is infrared
The photoelectric sensor aging that works for a long time changes transmission characteristic, and the increase of matching deviation causes job stability to reduce；It is right
The Gray code band manufacture craft requirement of transmitter liquid level is tight, the high and live operation maintenance working strength of production cost is big etc..
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of intelligence 4~20mA two-wire system photoelectricity level transmitters, with gram
Take defect present in prior art.It has low-power consumption, supply district wide, has super error correction ability to sensing data, surely
Determine reliability height, the advantages of reducing the maintenance intensity of Field Force.
The technical scheme is that：A kind of intelligence 4~20mA two-wire system photoelectricity level transmitters, it is characterised in that：Bag
Include processor, and power-switching circuit, photoelectric sensor control detection unit, D/A converter and the HART being connected with processor
Communication unit；Wherein, processor control collection photoelectric sensor control detection unit is so as to obtain liquid level signal, the liquid level signal
4~20mA standard signals are converted to by D/A converter, while meeting by HART communication unit in 4~20mA carrier waves
Bell202 international standard protocols, realize the bi-directional digital communication between transmitter and control room.
Including the polarity switching or single diode being connected with power-switching circuit, to realize to transmitter power supply not
The access of polarity.
The polarity switching is diode rectification bridge circuit.
The power-switching circuit is DC-DC change-over circuits, for being converted to system working power.
The processor uses the processor of low-power consumption, to reduce system power dissipation.
The D/A converter is using the D/I type D/A converters for being converted directly into 4~20mA, or is that D/V conversions and V/I turn
Change the compound change-over circuit of combination.
The HART communication unit is demodulated by controlling using the HART chips for meeting Bell202 standards, HART communication unit
The Bell202 carrier voltages signal that room is sent is communication instruction, then transmitter data is modulated as an electrical current carrier wave to 4
On ~ 20mA electric current loops, the bidirectional data exchange transmission between control room system and transmitter devices is finally reached.
The present invention technique effect be：
1. transmitter realizes the transmission of 4 ~ 20mA two-wire systems signal, belong to pioneering in like product；
2. the correcting data error disposal ability of transmitter is strong, reliability improves a lot；
3. transmitter supply district is wide, adapt in intrinsic safe explosion-proof occasion instrument to more barrier selects；
4. transmitter supports HART communication interface on the basis of two-wire system, convenient bidirectional data transfer and instrument are safeguarded；
5. transmitter has diagnostic function to the health status of itself, it can accomplish that failure is predicted and handled in advance；
6. the raising of the performance of transmitter and the enhancing of adaptability, reduce the maintenance workload of Field Force.
7. transmitter employs the process circuit of the strong photoelectric sensor of low-power consumption error correcting capability, Overall Power Consumption is low, power supply
Wide for scope, error correction capability is strong, and 4~20mA two-wire systems are realized on the basis of the performance of light guide level meter is greatly improved
Pick-up is exported, and facilitates the integrated of DCS data collecting systems.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention.
Reference is as follows：
1. polarity switching, 2. power-switching circuits, 3. processors, 4. photoelectric sensors control detection unit, 5.DA
Converter, 6.HART communication units.
Embodiment
The present invention relates to level measurement instrument technical field, more particularly to a kind of intelligence 4 ~ 20mA two-wire system photoelectricity things
Position transmitter circuit.
Referring to Fig. 1, a kind of 4~20mA of intelligence two-wire systems photoelectricity level transmitter of the present invention be specially：
Including processor 3, and be connected with processor 3 power-switching circuit 2, photoelectric sensor control detection unit 4,
D/A converter 5 and HART communication unit 6；Wherein, the control of processor 3 collection photoelectric sensor control detection unit 4 is so as to obtain
Liquid level signal, the liquid level signal is converted to 4~20mA standard signals by D/A converter 5, while being existed by HART communication unit 6
4~20mA carrier waves meet Bell202 international standard protocols, realize the bi-directional digital communication between transmitter and control room.
The polarity switching 1 or single diode being connected with power-switching circuit 2 are may also include in the present invention, with realization pair
The access of the not polarity of transmitter power supply.It realizes the positive and negative not polarity of the wiring of in-situ transducer, and which can facilitate
The unnecessary polarity identification of user or the device damage thereby resulted in.The polarity switching 1 concretely diode rectification
Bridge circuit.
Power-switching circuit 2 in the present invention can be DC-DC change-over circuits, for the electricity after diode rectifier bridge rectification
Source is converted to system working power.The change-over circuit wide input voltage range, high conversion efficiency is supplied with the wide power for adapting to scene
The requirement of electricity and transducer system power consumption.
Processor 3 in the present invention can use the processor of low-power consumption, to reduce system power dissipation.The processor 3 and photoelectricity
Sensor controls detection unit（4）Connect and completed according to its logical requirements the acquisition process of liquid level data；Processor（3）With
HART communication unit（6）, D/A converter（5）The realization of corresponding function is completed Deng circuit.
Photoelectric sensor control detection unit 4 in the present invention, low in energy consumption, error correcting capability it is strong, circuit logic level knows
Other ability is strong, and adaptability is good, and unfailing performance is high, is especially suitable for the signal transacting of multichannel photoelectric switching circuit, and have self diagnosis
Ability.Photoelectric sensor controls the partial circuit of detection unit 4 to be realized by integrated inner function module within a processor, such as
AD converter, comparator etc., to reduce peripheral components, reduce trouble point quantity, improve product reliability.
D/A converter 5 in the present invention can be using the D/I type D/A converters for being converted directly into 4~20mA, or D/V
Conversion and the compound change-over circuit of V/I shifting combinations.D/A converter 5 uses high accuracy DA digital-to-analogue 4~20mA change-over circuits, leads to
The loop current adjustment of transmitter is directly converted to 4~20mA analog signals by the digital quantity for crossing the output of processor 3, can also be led to
Cross D/A converter and digital quantity is converted to voltage analog, then 4~20mA analog signals are converted to by V-I analog voltages and constitute
Compound circuit or the digital quantity realized by pulse width modulation and 4~20mA conversion compound circuit.DA turns
Parallel operation 5 is used for the analog signal for collection numerical data being converted to 4~20mA.
HART communication unit 6 in the present invention is using the HART chips for meeting Bell202 standards, and the unit is demodulated by controlling
The Bell202 carrier voltages signal that room is sent is communication instruction, then transmitter data is modulated as an electrical current carrier wave to 4
On~20mA electric current loops, the bidirectional data exchange transmission between control room system and transmitter devices is finally reached.The unit by
HART modem chips and its peripheral circuit composition.The unit meets Bell202 international standard protocols, has been internally integrated modulatedemodulate
Device is adjusted, its digital interface is connected with processor, is modulated and be superimposed upon in 4~20mA analog signals using frequency shift keying fsk technology
Coded carrier signal, it is possible to carrier signal that HART units receive is demodulated to processor, to realize computer and pick-up
The bidirectional data interaction transmission of uplink and downlink between device.
As shown in figure 1, the external power source rectification of not polarity is carried out pole by polarity switching 1 by external power source
Property conversion after give power-switching circuit DC-DC input, Power convert output system power supply, for processor and other circuits
Use.
Processor uses super low-power consumption MSP430 Series MCUs, under 1MHz work clocks, power consumption during 2.2V power supplies
There are 8 road 12bitAD converters in only 280uA, minimum operating voltage 1.8V, processor piece, it is convenient to be controlled with photoelectric sensor
The function of detection unit is realized；Processor also completes corresponding function with the circuit interface such as D/A converter, HART communication unit simultaneously
Realization and data calculation process.
Processor makes the corresponding infrared sensor receiving channel of output by controlling photoelectric sensor control detection circuit unit
Voltage output signal, the signal by processor internal A/D converter complete sample, and pass through the threshold value of inner setting, carry out
Logic error correction judges and exports corresponding level value.
A kind of monolithic high performance mode converter that the conversion of 4~20mA current signals is released using ADI companies of the U.S.（Number
Word/electric current）, it is that the serial SPI modes of 16bit are inputted, 4~20mA outputs, it provides highly integrated, low-power consumption, high-precision letter
Number conversion plan.
HART communication uses in HART modem special chips, the chip slapper and is integrated with the modulation for meeting BELL202 standards
Demodulator, realizes that HART protocol provides the coding and decoding of digital communication with its peripheral circuit.The data of HART communication use frequency displacement
Keying FSK technologies are modulated demodulated signal, and the signal of modulation is superimposed a frequency in 4~20mA analog signals, the frequency
Rate meets BELL202 standards, and 1200HZ represents " 0 " that 2200HZ is represented " 1 ", signal amplitude 0.5mA, within a signal period,
The average value of fsk signal is 0, will not produce any influence to 4~20mA analog signals；While frequency signal solution also to reception
Output is adjusted to processor to complete two-way data transfer.
Claims (1)
1. a kind of intelligence 4~20mA two-wire system photoelectricity level transmitters, it is characterised in that：Including processor（3）, and with place
Manage device（3）Connected power-switching circuit（2）, photoelectric sensor control detection unit（4）, DA converters（5）, HART communication
Unit（6）With with power-switching circuit（2）Connected polarity switching（1）Or single diode, to realize to transmitter power supply
Not polarity access；Wherein, processor（3）Control collection photoelectric sensor control detection unit（4）So as to obtain liquid level
Signal, the liquid level signal passes through DA converters（5）4~20mA standard signals are converted to, while passing through HART communication units
（6）Meet Bell202 international standard protocols in 4~20mA carrier waves, realize the bi-directional digital between transmitter and control room
Communication；Including；The DA converters（5）Using the D/I type DA converters for being converted directly into 4~20mA, or it is D/V
Conversion and the compound change-over circuit of V/I shifting combinations；The polarity switching（1）For diode rectification bridge circuit；It is described
Power-switching circuit（2）It is DC-DC change-over circuits, for being converted to system working power；The HART communication unit（6）Adopt
With the HART chips for meeting Bell202 standards, HART communication units（6）Demodulate the Bell202 carrier waves sent by control room
Voltage signal is communication instruction, then transmitter data is modulated as an electrical current carrier wave to 4 ~ 20mA electric current loops, finally reached
To the bidirectional data exchange transmission between control room system and transmitter devices；The output of 4~20mA two-wire systems pick-up is realized,
Facilitate the integrated of DCS data collecting systems；The processor（3）Using super low-power consumption MSP430 Series MCUs, in 1MHz work
Under clock, power consumption during 2.2V power supplies, which only has in 280uA, minimum operating voltage 1.8V, processor piece, 8 road 12bitAD
Converter, it is convenient to control the function of detection unit to realize with photoelectric sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110411608.XA CN102564530B (en) | 2011-12-12 | 2011-12-12 | A kind of intelligence 4~20mA two-wire system photoelectricity level transmitters |
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| CN201110411608.XA CN102564530B (en) | 2011-12-12 | 2011-12-12 | A kind of intelligence 4~20mA two-wire system photoelectricity level transmitters |
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| CN102564530A CN102564530A (en) | 2012-07-11 |
| CN102564530B true CN102564530B (en) | 2017-09-29 |
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| CN107219389B (en) * | 2017-05-27 | 2019-12-03 | 重庆编福科技有限公司 | One kind compensating stealing formula transmitter from ring based on Darlington optocoupler |
| CN107941294A (en) * | 2017-11-21 | 2018-04-20 | 江苏斯尔邦石化有限公司 | A kind of measuring instrument accumulates data synchronous |
| CN108765916A (en) * | 2018-04-08 | 2018-11-06 | 南京达凯电力自动化设备有限公司 | A kind of sensor that signal carrier encrypted state is controllable |
| CN109856534A (en) * | 2018-12-18 | 2019-06-07 | 南京南自电力仪表有限公司 | A kind of generator electric parameters transducer based on the Hart communication technology |
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Owner name: ZHUFENG INSTRUMENT AND GUAGE CO., LTD., HEBEI PROV Free format text: FORMER OWNER: XI'AN FU'AN INNOVATION CONSULTATION CO., LTD. Effective date: 20120913 |
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Free format text: CORRECT: ADDRESS; FROM: 710077 XI'AN, SHAANXI PROVINCE TO: 056005 HANDAN, HEBEI PROVINCE |
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Effective date of registration: 20120913 Address after: The eastern city of Handan province Hebei Xuechi road 056005 Applicant after: Hebei Zhufeng Instrument & Meter Co., Ltd. Address before: 710077, building 1, Residence Du Commerce, 69 Kam Yip Road, hi tech Zone, Shaanxi, Xi'an Applicant before: Xi'an Fuan Innovation Consultation Co., Ltd. |
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Address after: 056600 west section of Gucheng Road, Linzhang County, Handan, Hebei Patentee after: Hebei Zhufeng Instrument & Meter Co., Ltd. Address before: 056005 eastern section of snow road, Handan, Hebei Patentee before: Hebei Zhufeng Instrument & Meter Co., Ltd. |