CN104977116A - Micro-differential voltage transmitter - Google Patents
Micro-differential voltage transmitter Download PDFInfo
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- CN104977116A CN104977116A CN201510400280.XA CN201510400280A CN104977116A CN 104977116 A CN104977116 A CN 104977116A CN 201510400280 A CN201510400280 A CN 201510400280A CN 104977116 A CN104977116 A CN 104977116A
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- 239000003381 stabilizer Substances 0.000 claims description 16
- 239000004973 liquid crystal related substance Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011326 mechanical measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention discloses a micro-differential voltage transmitter which comprises a microprocessor, an A/D converter, a D/A converter, an LED, a modem, a keyboard, a memory, a voltage-stablizer, a V/I converting circuit and a power supply, wherein the A/D converter, the D/A converter, the LED, the modem, the keyboard, the memory and the voltage-stablizer are connected with the microprocessor, the input end of the V/I converting circuit is connected with the output end of the D/A converter, and the power supply is connected with the voltage-stablizer and supplies power to the microprocessor. The micro-differential voltage transmitter is simple in integral structure, easy for realization, and low in cost. The micro-differential voltage transmitter is universal and is applicable to the civil field.
Description
Technical field
The present invention relates to device for pressure measurement, specifically differential pressure transmitter.
Background technology
Pressure survey is one of the most basic commercial measurement, the earliest, most typical pressure measuring instruments is Bourdon tube pressure gauge, according to elastic deformation principle, the change of pressure is directly amplified by the degree of crook of asymmetric interface copper alloy tube, transmission and indicated.Along with the develop rapidly of advanced manufacturing technology, new material technology, microelectric technique and infotech, non-electrical quantity measuring technology impels tonometric mode to obtain huge leap.From simple mechanical measurement (as spring-tube type, diaphragm type, diaphragm pressure gage), develop into the pressure transducer of various different principle, as resistance-strain type, condenser type, piezoelectric type, diffused silicon piezoresistive pressure sensor etc.By instrument special IC (ASIC) technology, the active signal that above-mentioned different sensor exports is carried out nursing one's health, amplifying, namely produce a complete pressure unit, the accurate measurement of industry spot pressure signal can be realized, and export 4 ~ 20mA standard signal.
In recent years, pressure unit is widely used in the large-scale industry fields such as chemical industry, metallurgy, generating, but, existing pressure unit is in order to adapt to the demand of industrial circle, and common configuration is complicated, and cost is higher, not there is industry universal, and then be not easy to apply at civil area.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of differential pressure transmitter, its one-piece construction is simple, and be convenient to realize, cost is low, has versatility, and then is convenient to apply at civil area.
The present invention solves the problem and is achieved through the following technical solutions: differential pressure transmitter, comprise microprocessor, A/D converter, D/A converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer, V/I change-over circuit and power supply, described A/D converter, D/A converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer are all connected with microprocessor, described V/I change-over circuit input end is connected with the output terminal of D/A converter, and described power supply is connected with voltage stabilizer and is microprocessor power supply.When the present invention applies, the simulating signal input a/d converter that sensor gathers, send into microprocessor after converting digital quantity to by A/D converter, microprocessor, by the digital quantity input D/A converter after process, exports 4 ~ 20mA standard current signal through V/I change-over circuit.When digital communication, microprocessor receives data or to medium transfer data by modulator-demodular unit with 4 ~ 20mA current loop.
Further, differential pressure transmitter, also comprises temperature sensor, and described temperature sensor is connected with microprocessor.
Further, described temperature sensor adopts TMP100 chip.
Further, described microprocessor adopts MPS430F135 chip.Microprocessor will control A/D converter, D/A converter, modulator-demodular unit, keyboard, LCD MODULE, therefore the I/O mouth needed is many, and MSP430F135 has 48 I/O mouths, wherein there are 16 to have interrupt function, make the present invention can meet the demand of I/O mouth.
Because HART communication protocol can simultaneously the 4-20mA simulating signal of outputting standard and digital signal, can be compatible with many existing analog field instruments, further, described modulator-demodular unit adopts HART modulator-demodular unit.So, adopt HART communication protocol when the present invention applies, range of application of the present invention can be made more wide in range.
Further, described voltage stabilizer adopts AD421 chip.
Further, described D/A converter adopts AD7789 chip.
In sum, the present invention has following beneficial effect: (1) the present invention includes microprocessor, A/D converter, D/A converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer, V/I change-over circuit and power supply, wherein, A/D converter, D/A converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer is all connected with microprocessor, V/I change-over circuit input end is connected with the output terminal of D/A converter, power supply is connected with voltage stabilizer and is microprocessor power supply, the present invention adopts said structure, one-piece construction is simple, use device is few, cost is low, overall volume of the present invention can be made less when mounting design of the present invention, possesses industry universal, be convenient to apply at civil area.
(2) the present invention is directed to the specific requirement of civil area to differential pressure transmitter different because of environment for use; the characteristic of larger difference is there is with the large input of traditional industrial circle, high production, standardized designs, large-scale production; select suitable little differential pressure sensor; and adopt singlechip technology; the design platform of exploitation differential pressure transmitter; possess communication function, and be convenient to batch sizes, there is larger economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention's specific embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing, detailed description is further done to the present invention, but embodiments of the present invention are not limited thereto.
Embodiment:
As shown in Figure 1, differential pressure transmitter, comprise microprocessor, A/D converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer, temperature sensor, V/I change-over circuit and power supply, A/D converter, D/A converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer and temperature sensor are all connected with microprocessor, V/I change-over circuit input end is connected with the output terminal of D/A converter, and power supply is connected with voltage stabilizer and is microprocessor power supply.The storer of the present embodiment is used for the running parameter such as the characterisitic parameter of storage sensor, on-the-spot order, presence states.The microprocessor of the present embodiment adopts MPS430F135 low-power consumption 16 single-chip microcomputers of Texas Instruments (TI) company, temperature sensor adopts TMP100 chip, modulator-demodular unit adopts HART modulator-demodular unit, voltage stabilizer adopts the integrated IC chip AD421 of AD company, A/D converter adopts ADC0809 chip, and D/A converter adopts AD7789 chip.Wherein, AD421 is that a kind of electric current loop combines with power supply, Digital Signals exports 4 ~ 20mA, aim at a technical grade chip of fieldbus HART communication scheme, there is a selectable regulator its inside, can control the voltage exporting 5V, 3.3V, 3V, supply miscellaneous equipment uses, and it also can export the accurate reference voltage of 2.5V and 1.25V simultaneously.There is the sigma-delta DAC module of 16 AD421 inside, controls 4 ~ 20mA electric current and exports.In the specific implementation, the signal output part of HART modulator-demodular unit and input end connect a wave shaping and bandpass filter to the present embodiment respectively, to strengthen the reliability communicated.
The present embodiment is when specifically connecting, and keyboard is connected on the P1 mouth of microprocessor, and this I/O port, with interrupt function, therefore can be used for regulating in real time.That D/A converter adopts is AD7789, and this chip, with a common serial ports, therefore simulates a serial communication sequential with microprocessor P3 mouth, and realization communicates with AD7789.HART modulator-demodular unit, with the asynchronous serial communication mouth (UART) of a standard, is therefore directly connected its asynchronous serial communication mouth with the asynchronous serial communication mouth of microprocessor, realize the communication with HART modem chip.Voltage stabilizer and liquid crystal display are common serial ports, therefore also use the I/O mouth Serial Communication Simulation sequential of microprocessor, realize data transmission.The TMP100 of TI company selected by temperature sensor, this chip is the temperature sensor chip of 12, it measures external temperature automatically, and carry out filtering and correction, finally export the digital signal of 12, this chip carries an I2C bus interface, be connected on the P2 mouth of microprocessor, use the P2 mouth of microprocessor to simulate an I2C bus timing, directly measurement numerical value is read out, just obtain current temperature value after treatment.
Above content is the further description done the present invention in conjunction with concrete preferred implementation, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments drawn under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (7)
1. differential pressure transmitter, it is characterized in that, comprise microprocessor, A/D converter, D/A converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer, V/I change-over circuit and power supply, described A/D converter, D/A converter, liquid crystal display, modulator-demodular unit, keyboard, storer, voltage stabilizer are all connected with microprocessor, described V/I change-over circuit input end is connected with the output terminal of D/A converter, and described power supply is connected with voltage stabilizer and is microprocessor power supply.
2. differential pressure transmitter according to claim 1, is characterized in that, also comprises temperature sensor, and described temperature sensor is connected with microprocessor.
3. differential pressure transmitter according to claim 2, is characterized in that, described temperature sensor adopts TMP100 chip.
4. differential pressure transmitter according to claim 1, is characterized in that, described microprocessor adopts MPS430F135 chip.
5. differential pressure transmitter according to claim 1, is characterized in that, described modulator-demodular unit adopts HART modulator-demodular unit.
6. differential pressure transmitter according to claim 1, is characterized in that, described voltage stabilizer adopts AD421 chip.
7. differential pressure transmitter according to claim 1, is characterized in that, described D/A converter adopts AD7789 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510400280.XA CN104977116A (en) | 2015-07-10 | 2015-07-10 | Micro-differential voltage transmitter |
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| CN201510400280.XA CN104977116A (en) | 2015-07-10 | 2015-07-10 | Micro-differential voltage transmitter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587651A (en) * | 2015-12-30 | 2016-05-18 | 天津迈帝特智控科技有限公司 | General scheme for intelligent monitoring terminal for oil pump |
| CN113188712A (en) * | 2021-05-26 | 2021-07-30 | 上海恩邦自动化仪表股份有限公司 | Capacitive pressure transmitter |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2800253Y (en) * | 2005-05-13 | 2006-07-26 | 沈阳仪表科学研究院 | Bust type pressure transmitter |
| US20090139346A1 (en) * | 2007-11-29 | 2009-06-04 | Klosinski Andrew J | Process fluid pressure transmitter with pressure transient detection |
| CN201429480Y (en) * | 2009-07-15 | 2010-03-24 | 安徽皖科电子工程有限公司 | Pressure Transmitter Based on PROFIBUS-PA Bus Communication Protocol |
| CN101726389A (en) * | 2008-10-31 | 2010-06-09 | 沈阳仪表科学研究院 | Silicon capacitance intelligent pressure/differential pressure transmitter and a measurement method thereof |
| CN101988912A (en) * | 2010-09-04 | 2011-03-23 | 山西科致成科技有限公司 | Digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines |
| CN202453137U (en) * | 2012-01-09 | 2012-09-26 | 重庆万控科技有限公司 | Digital differential pressure transmitter |
| CN203337299U (en) * | 2013-07-11 | 2013-12-11 | 西安科技大学 | Resistance strain-type multi-channel high-accuracy force measurement system |
| CN204758198U (en) * | 2015-07-10 | 2015-11-11 | 四川奇胜科技有限公司 | Intelligent little differential pressure transmitter |
-
2015
- 2015-07-10 CN CN201510400280.XA patent/CN104977116A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2800253Y (en) * | 2005-05-13 | 2006-07-26 | 沈阳仪表科学研究院 | Bust type pressure transmitter |
| US20090139346A1 (en) * | 2007-11-29 | 2009-06-04 | Klosinski Andrew J | Process fluid pressure transmitter with pressure transient detection |
| CN101726389A (en) * | 2008-10-31 | 2010-06-09 | 沈阳仪表科学研究院 | Silicon capacitance intelligent pressure/differential pressure transmitter and a measurement method thereof |
| CN201429480Y (en) * | 2009-07-15 | 2010-03-24 | 安徽皖科电子工程有限公司 | Pressure Transmitter Based on PROFIBUS-PA Bus Communication Protocol |
| CN101988912A (en) * | 2010-09-04 | 2011-03-23 | 山西科致成科技有限公司 | Digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines |
| CN202453137U (en) * | 2012-01-09 | 2012-09-26 | 重庆万控科技有限公司 | Digital differential pressure transmitter |
| CN203337299U (en) * | 2013-07-11 | 2013-12-11 | 西安科技大学 | Resistance strain-type multi-channel high-accuracy force measurement system |
| CN204758198U (en) * | 2015-07-10 | 2015-11-11 | 四川奇胜科技有限公司 | Intelligent little differential pressure transmitter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587651A (en) * | 2015-12-30 | 2016-05-18 | 天津迈帝特智控科技有限公司 | General scheme for intelligent monitoring terminal for oil pump |
| CN113188712A (en) * | 2021-05-26 | 2021-07-30 | 上海恩邦自动化仪表股份有限公司 | Capacitive pressure transmitter |
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