CN102980715B - Capacitance pressure transmitter and pressure capsule system - Google Patents

Capacitance pressure transmitter and pressure capsule system Download PDF

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Publication number
CN102980715B
CN102980715B CN201210465854.8A CN201210465854A CN102980715B CN 102980715 B CN102980715 B CN 102980715B CN 201210465854 A CN201210465854 A CN 201210465854A CN 102980715 B CN102980715 B CN 102980715B
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China
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described
pressure transmitter
pressure
voltage signal
capacitance
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CN201210465854.8A
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Chinese (zh)
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CN102980715A (en
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李凤奎
伍正辉
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上海朝辉压力仪器有限公司
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Publication of CN102980715A publication Critical patent/CN102980715A/en
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Abstract

The invention discloses a kind of capacitance pressure transmitter and pressure capsule system, described capacitance pressure transmitter comprises a capacitor differential pressure transducer, a detuner, a MCU and a communication module; Described detuner is used for the capacitive differential that described capacitor differential pressure transducer generates to be converted into analog voltage signal; Described MCU is used for the analog voltage signal that described detuner exports to be converted into digital voltage signal; The zero-pressure instruction that described MCU also receives based on described communication module or full end finger order, record described communication module and receive the digital voltage signal that when described zero-pressure instruction or full end finger make, described MCU exports.Present invention also offers a kind of pressure capsule system using described capacitance pressure transmitter.Capacitance pressure transmitter of the present invention and pressure capsule system realize the function of long-range demarcation by the combination of communication module and MCU.

Description

Capacitance pressure transmitter and pressure capsule system

Technical field

The present invention relates to a kind of pressure unit and pressure capsule system, particularly relate to a kind of capacitance pressure transmitter and use the pressure capsule system of described capacitance pressure transmitter.

Background technology

Along with the fast development of science and technology, the Measurement & Control technology of non-physical quantities, is more and more broadly applied to the technical fields such as space flight, aviation, communications and transportation, metallurgy, machine-building, oil, light industry, technical supervision and test.

Needing the manufacturing variables gathered in production run to comprise pressure, temperature and flow etc. in process of production, after this processing by passing these data back center-control, and then regulate the links of production run to optimize the production run of whole product.

But zero drift and the drift technical barrier that to be the sensor of the non-physical quantities of current all detection production runes all to be solved.Especially at present conventional pressure unit remains the mode adopting on-the-spot manual setting, but thisly carries out by the knobs such as knob that return to zero the mode that zero-bit or full scale demarcate again and regulate extremely inconvenient, waste time and energy, and knob itself also very easily damages.

And effect must be carried out by effect equipment to product due to the pressure unit that current industry is conventional after product is installed, and during effect, need the effect equipment that the manpower of at substantial, time and needs are expensive, thus this mode of again demarcating extends the debug time of production line greatly, is more unfavorable for enhancing productivity.

Summary of the invention

The technical problem to be solved in the present invention needs the on-the-spot zero-bit of manual setting pressure unit and the defect of full scale to overcome prior art, a kind of capacitance pressure transmitter and pressure capsule system are provided, are realized the function of long-range demarcation by the combination of communication module and MCU.

The present invention solves above-mentioned technical matters by following technical proposals:

The invention provides a kind of capacitance pressure transmitter, be characterized in, described capacitance pressure transmitter comprises a capacitor differential pressure transducer, a detuner, a MCU(microcontroller) and a communication module;

Described detuner is used for the capacitive differential that described capacitor differential pressure transducer generates to be converted into analog voltage signal; Described MCU is used for the analog voltage signal that described detuner exports to be converted into digital voltage signal;

The zero-pressure instruction that described MCU also receives based on described communication module or full end finger order are recorded described communication module and are received described zero-pressure instruction or full end finger when making, the digital voltage signal that described MCU exports.

The instruction of zero-pressure described in the present invention refers to when capacitor differential pressure transducer pressure is zero, allows described MCU gather the digital voltage signal characterizing the capacitive differential of now described capacitor differential pressure transducer after detuner and MCU conversion.

In like manner, described full end finger order refers to when capacitor differential pressure transducer pressure full scale, allows described MCU gather the digital voltage signal characterizing the capacitive differential of now described capacitor differential pressure transducer after detuner and MCU conversion.

Capacitor differential pressure transducer of the present invention is the sensor that in prior art, logical superpotential difference carrys out characterization pressure change, so be no longer described in detail herein.

Utilize communication module to receive outside zero-pressure instruction or full end finger order in the present invention, thus control described MCU and gather the digital voltage signal that described capacitor differential pressure transducer corresponds to null pressure or full stroke pressure.Thus realize long-range demarcation and automatic Calibration.

Preferably, described capacitance pressure transmitter also comprises a temperature sensor of the temperature for detecting environment residing for described capacitor differential pressure transducer, and described MCU also compensates described digital voltage signal based on described temperature correction.

Utilize existing technique for temperature compensation in the present invention, based on the temperature of environment residing for capacitor differential pressure transducer, the digital voltage signal that described MCU exports is compensated, thus the deviation of the temperature drift of the digital voltage signal avoiding MCU to export.

Preferably, described detuner obtains clock signal from an oscillator.The present invention by separately for described detuner provides clock signal, thus is convenient to control detuner capacitive differential is converted into analog voltage signal, such as, can improve clock signal to improve the precision etc. of detuner conversion.

Preferably, described clock signal is 30KHz.

Preferably, described capacitance pressure transmitter also comprises a current conversion unit, is converted into current signal for the digital voltage signal exported by described MCU.

In the present invention, also by Voltage to current transducer, to be specific application etc. provide characterizes the current signal of capacitive differential.

Preferably, described current conversion unit is an ADI(Ya De promise semiconductor) the AD421 chip of company.

AD421 chip is that the 4-20mA of a complete loop service powers conversion converter, aims at the demand that meets industrial control field intelligence transmitter manufacturer and designs.It provides a kind of high precision, fully integrated, low cost solution, adopts compact 16 pin package.

AD421 chip is particularly suitable for the resolution expanding 4-20mA intelligence transmitter, and cost is extremely low.AD421 built-in chip type alternate actuators, for powering for other device in self and transmitter.This regulator can provide+5V ,+3.3V or+3V regulation output voltage.

AD421 chip is built-in+1.25V and+2.5V accurate reference voltage also.Therefore, AD421 chip does not need discrete regulator and reference voltage source, so utilize described AD421 chip can simplify the structure of whole capacitance pressure transmitter in the present invention.

Preferably, described communication module is HART(HighwayAddressableRemoteTransducer, the open communication agreement of highway addressable remote transducer) communication module.

HART agreement adopts the FSK(frequency shift keying based on Bell202 standard (a kind of privately owned modem interface of Bell Laboratory)) signal, the simulating signal of low frequency superposes audio digital signals and carries out bi-directional digital communication, data transmission rate is 1.2Mbps.Mean value due to fsk signal is 0, does not affect the size sending Control system simulation signal to, ensure that the compatibility with existing simulation system.

Present invention also offers a kind of pressure capsule system, be characterized in, described pressure capsule system comprises one or more capacitance pressure transmitter as above and a terminal, and described terminal is used for for each capacitance pressure transmitter provides zero-pressure instruction or full end finger order.

Capacitance pressure transmitter of the present invention can realize long-range, unified control by terminal, and the range adjustment, temperature compensation etc. that improve capacitance pressure transmitter regulate efficiency.

Preferably, described terminal is computing machine or PLC(programmable logic controller).

On the basis meeting this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains the preferred embodiments of the invention.

Positive progressive effect of the present invention is:

Capacitance pressure transmitter of the present invention and pressure capsule system realize the function of long-range demarcation by the combination of communication module and MCU.

And the software and hardware that in the present invention, temperature compensation is relevant at HART communication module and MCU basis upper set, just can complete the zero-bit of capacitance differential pressure cell and the base measuring temperature compensation of full scale, realize long-range demarcation.The voltage signal characterizing capacitive differential change can also be converted into current signal by the present invention simultaneously, is convenient to the use of follow-up particular elements or device.

Accompanying drawing explanation

Fig. 1 is the structural representation of the capacitance pressure transmitter of embodiments of the invention 1.

Embodiment

Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.

Embodiment 1

The pressure capsule system of the present embodiment comprises a capacitance pressure transmitter and a computing machine, and described computing machine provides zero-pressure instruction for described capacitance pressure transmitter or expires end finger order.

Specifically, as shown in Figure 1, the capacitance pressure transmitter of the present embodiment comprises capacitor differential pressure transducer 1, detuner 2, MCU3, a HART communication module 4, AD421 chip 5, temperature sensor 6 and an oscillator 7.

Wherein said detuner 2 is converted into analog voltage signal for the capacitive differential generated by described capacitor differential pressure transducer 1; Described MCU3 is used for the analog voltage signal that described detuner 2 exports to be converted into digital voltage signal.

The zero-pressure instruction that described MCU3 also receives based on described HART communication module 4 or full end finger order are recorded it and are received described zero-pressure instruction or full end finger when making, the digital voltage signal that described MCU3 exports.The data that the HART communication module 4 that only needs wherein said MCU3 to receive is transmitted by serial ports and instruction, such as gather when digital voltage signal etc. corresponding to the pressure of leading zero, this HART agreement receives process and has been come by described HART communication module 4, by detecting corresponding to the fsk signal on the 4-20mA of described AD421 chip 5, and the information filtering be included in fsk signal out, and send to described MCU3 by serial ports.

Described temperature sensor 6 is for detecting the temperature of environment residing for described capacitor differential pressure transducer 1.Described MCU3 also compensates its described digital voltage signal exported based on described temperature correction.

Detuner 2 described in the present embodiment obtains the clock signal of 30KHz from described oscillator 7.Described AD421 chip 5 is that the 4-20mA of loop service powers conversion converter, is converted into current signal for the digital voltage signal exported by described MCU3.

The principle of work of the capacitance pressure transmitter of the present embodiment is: when capacitor differential pressure transducer 1 detects pressure, also corresponding change can be there is in the electric capacity of corresponding capacitor differential pressure transducer 1, the described detuner 2 of supply of the 30KHz of described oscillator 7 generation simultaneously, described detuner 2 is converted to corresponding analog voltage signal the amount of capacitance variations, and described analog voltage signal exports digital voltage signal through the analog to digital conversion of described MCU3.

The simultaneously state of temperature of capacitor differential pressure transducer 1 that gathers based on described temperature sensor 6 of described MCU3, described digital voltage signal is compensated, then output to described AD421 chip 5, described AD421 chip 5 converts the current signal of range of current between 4-20mA to digital voltage signal and exports.

As follows to the principle of work of capacitance pressure transmitter adjustment in the pressure capsule system of the present embodiment:

First described above, described capacitance pressure transmitter is in normal operating conditions.

Then, when ensureing that on capacitor differential pressure transducer 1, actual pressure is zero, described computing machine provides zero-pressure instruction to described capacitance pressure transmitter.Now described MCU3 detects whether described HART communication module 4 receives instruction in real time.

After this, when described MCU3 is after determining that described HART communication module 4 receives zero-pressure instruction, described MCU3 record, its digital voltage signal exported when described HART communication module 4 receives zero-pressure instruction, and it can be used as zero-point voltage signal, and then as zero-point correction value during later pressure detection.

Finally, the temperature that can also detect at this moment based on temperature sensor 6 carries out temperature compensation to described zero-point voltage signal, thus reduces error further.

In like manner, when ensureing that on capacitor differential pressure transducer 1, actual pressure is described capacitor differential pressure transducer 1 maximum detection piezometric power, described computing machine provides full end finger to make to described capacitance pressure transmitter.After this same flow process according to the above-mentioned voltage signal of zeroing really, determines full scale voltage signal now, and as full scale corrected value during later pressure detection.

Although the foregoing describe the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can make various changes or modifications to these embodiments, but these change and amendment all falls into protection scope of the present invention.

Claims (9)

1. a capacitance pressure transmitter, described capacitance pressure transmitter comprises a capacitor differential pressure transducer, a detuner, a MCU and a communication module;
Described detuner is used for the capacitive differential that described capacitor differential pressure transducer generates to be converted into analog voltage signal; Described MCU is used for the analog voltage signal that described detuner exports to be converted into digital voltage signal; It is characterized in that,
The zero-pressure instruction that described MCU also receives based on described communication module or full end finger order, record described communication module and receive the digital voltage signal that when described zero-pressure instruction or full end finger make, described MCU exports.
2. capacitance pressure transmitter as claimed in claim 1, it is characterized in that, described capacitance pressure transmitter also comprises a temperature sensor of the temperature for detecting environment residing for described capacitor differential pressure transducer, and described MCU also compensates described digital voltage signal based on described temperature correction.
3. capacitance pressure transmitter as claimed in claim 1, it is characterized in that, described capacitance pressure transmitter also comprises a current conversion unit, is converted into current signal for the digital voltage signal exported by described MCU.
4. capacitance pressure transmitter as claimed in claim 3, it is characterized in that, described current conversion unit is the AD421 chip of an ADI company.
5. capacitance pressure transmitter as claimed in claim 1, it is characterized in that, described detuner obtains clock signal from an oscillator.
6. capacitance pressure transmitter as claimed in claim 5, it is characterized in that, described clock signal is 30KHz.
7. the capacitance pressure transmitter according to any one of claim 1-6, is characterized in that, described communication module is HART communication module.
8. a pressure capsule system, it is characterized in that, described pressure capsule system comprises one or more capacitance pressure transmitter according to any one of claim 1-7 and a terminal, and described terminal is used for for each capacitance pressure transmitter provides zero-pressure instruction or full end finger order.
9. pressure capsule system as claimed in claim 8, it is characterized in that, described terminal is computing machine or PLC.
CN201210465854.8A 2012-11-16 2012-11-16 Capacitance pressure transmitter and pressure capsule system CN102980715B (en)

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US9752943B2 (en) * 2014-01-24 2017-09-05 Infineon Technologies Dresden Gmbh Sensor structures, systems and methods with improved integration and optimized footprint
US9546923B2 (en) 2014-01-24 2017-01-17 Infineon Technologies Dresden Gmbh Sensor structures, systems and methods with improved integration and optimized footprint
CN105571767A (en) * 2016-03-18 2016-05-11 山东昊润自动化技术有限公司 Silicon capacitive digital output barometer
TW201736814A (en) * 2016-04-12 2017-10-16 原相科技股份有限公司 Pressure measuring method and pressure measuring apparatus
US10578507B2 (en) 2016-04-12 2020-03-03 Pixart Imaging Inc. Pressure measuring method and pressure measuring apparatus
CN108885144A (en) * 2016-11-23 2018-11-23 深圳市汇顶科技股份有限公司 A kind of pressure detection method, device and equipment
WO2019011353A1 (en) * 2017-07-14 2019-01-17 北京康斯特仪表科技股份有限公司 Pressure calibration apparatus and pressure instrument calibration information processing method
CN109253837B (en) * 2017-07-14 2020-06-05 北京康斯特仪表科技股份有限公司 Pressure calibration device and processing method of pressure instrument calibration information
CN109425461A (en) * 2017-09-05 2019-03-05 上海融德机电工程设备有限公司 Intelligent pressure transmitter and its temperature-compensation method

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