CN102980715A - Capacitance pressure transmitter and pressure sensing system - Google Patents
Capacitance pressure transmitter and pressure sensing system Download PDFInfo
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- CN102980715A CN102980715A CN2012104658548A CN201210465854A CN102980715A CN 102980715 A CN102980715 A CN 102980715A CN 2012104658548 A CN2012104658548 A CN 2012104658548A CN 201210465854 A CN201210465854 A CN 201210465854A CN 102980715 A CN102980715 A CN 102980715A
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Abstract
The invention discloses a capacitance pressure transmitter and a pressure sensing system. The capacitance pressure transmitter comprises a capacitance differential pressure sensor, a demodulator, a microprogrammed control unit (MCU) and a communication module. The demodulator is used for converting capacitance differential value which is generated by the capacitance differential pressure sensor into an analog voltage signal. The MCU is used for converting the analog voltage signal which is outputted by the demodulator into a digital voltage signal. Based on a zero pressure directive and a full pressure directive that the communication module receives, the MCU records the digital voltage signal that is outputted by the MCU when the communication module receives the zero pressure directive and the full pressure directive. The invention further provides a pressure sensing system utilizing the capacitance differential pressure sensor. The capacitance pressure transmitter and the pressure sensing system enable a function of remote calibration to be achieved through the combination of the communication module and the MCU.
Description
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 of non-physical quantities and control technology are applied to the technical fields such as space flight, aviation, communications and transportation, metallurgy, machine-building, oil, light industry, technical supervision and test more and more extensively.
The manufacturing variables that needs in process of production to gather in the production run comprises pressure, temperature and flow etc., and after this by these data back center-controls are processed, and then the links of regulating production run is optimized the production run of whole product.
But zero drift and drift are that at present all detect sensor technical barrier to be solved all of the non-physical quantities of production runes.Especially at present conventional pressure unit remains the mode that adopts on-the-spot manual setting, but thisly carries out mode that zero-bit or full scale demarcate again by knobs such as zeroing knobs and regulate extremely inconveniently, waste time and energy, and knob itself also very easily damages.
And because present industry pressure unit commonly used must carry out effect to product by effect equipment after product is installed, and need to expend a large amount of manpowers, time during effect and need expensive effect equipment, thereby this mode of again demarcating prolonged the debug time of production line greatly, more is unfavorable for enhancing productivity.
Summary of the invention
The technical problem to be solved in the present invention is to need the zero-bit of on-the-spot manual setting pressure unit and the defective of full scale in order to overcome prior art, a kind of capacitance pressure transmitter and pressure capsule system are provided, realize 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 electric capacity difference that described capacitor differential pressure transducer generates is converted into analog voltage signal; Described MCU is used for the analog voltage signal of described detuner output is converted into digital voltage signal;
When the zero-pressure instruction that described MCU also receives based on described communication module or the described communication module of full end finger order record receive described zero-pressure instruction or full end finger and make, the digital voltage signal of described MCU output.
The instruction of zero-pressure described in the present invention refers to when the capacitor differential pressure transducer pressure is zero, allows described MCU gather through characterizing the digital voltage signal of the electric capacity difference of described capacitor differential pressure transducer this moment after detuner and the MCU conversion.
In like manner, described full end finger order refers to when capacitor differential pressure transducer pressure full scale, allows described MCU gather through characterizing the digital voltage signal of the electric capacity difference of described capacitor differential pressure transducer this moment after detuner and the MCU conversion.
Capacitor differential pressure transducer of the present invention is that logical superpotential difference characterizes the sensor that pressure changes in the prior art, so give unnecessary details no longer in detail herein.
Utilize communication module to receive outside zero-pressure instruction or full end finger order among the present invention, gather described capacitor differential pressure transducer corresponding to the digital voltage signal of zero point pressure or full stroke pressure thereby control described MCU.Thereby realize long-range demarcation and automatic Calibration.
Preferably, described capacitance pressure transmitter comprises that also described MCU also compensates described digital voltage signal based on described temperature correction for detection of a temperature sensor of the temperature of described capacitor differential pressure transducer environment of living in.
Utilize existing technique for temperature compensation among the present invention, compensate based on the temperature of capacitor differential pressure transducer environment of living in digital voltage signal to described MCU output, thereby avoid the deviation of temperature drift of the digital voltage signal of MCU output.
Preferably, described detuner obtains clock signal from an oscillator.The present invention for described detuner provides clock signal, is converted into analog voltage signal thereby be convenient to control detuner with the electric capacity difference by separately, improves the precision etc. of detuner conversion such as improving clock signal.
Preferably, described clock signal is 30KHz.
Preferably, described capacitance pressure transmitter also comprises a current conversion unit, is used for the digital voltage signal of described MCU output is converted into current signal.
Also come to provide the current signal that characterizes the electric capacity difference for specific application waits by the electric current and voltage conversion among the present invention.
Preferably, described current conversion unit is an ADI(Ya De promise semiconductor) the AD421 chip of company.
The AD421 chip is the 4-20mA power supply conversion converter of a complete loop service, aims at the demand that satisfies 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.
The AD421 chip is particularly suitable for expanding the resolution of 4-20mA intelligence transmitter, and cost is extremely low.Optional regulator of AD421 built-in chip type is used to other device power supply in self and the transmitter.This regulator can provide+5V ,+3.3V or+3V regulation output voltage.
The AD421 chip also built-in+1.25V and+the 2.5V accurate reference voltage.Therefore, the 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 among the present invention.
Preferably, described communication module is HART(Highway Addressable RemoteTransducer, the open communication agreement of highway addressable remote transducer) communication module.
The HART agreement adopts the FSK(frequency shift keying based on Bell202 standard (a kind of privately owned modem interface of Bell Laboratory)) signal, carry out the bi-directional digital communication at the simulating signal stack audio digital signals of low frequency, data transmission rate is 1.2Mbps.Because the mean value of fsk signal is 0, does not affect the size that sends the Control system simulation signal to, has guaranteed the compatibility with existing simulation system.
The present invention also provides a kind of pressure capsule system, be characterized in, described pressure capsule system comprises one or more aforesaid capacitance pressure transmitters and a terminal, and described terminal is used to each capacitance pressure transmitter that zero-pressure instruction or full end finger order are provided.
Capacitance pressure transmitter of the present invention can be realized long-range, unified control by terminal, has improved the range adjusting, temperature compensation etc. of capacitance pressure transmitter and has regulated efficient.
Preferably, described terminal is computing machine or PLC(programmable logic controller).
On the basis that meets this area general knowledge, above-mentioned each optimum condition, but combination in any namely get 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 are realized the function of long-range demarcation by the combination of communication module and MCU.
And among the present invention at HART communication module and MCU basis upper set the relevant software and hardware of temperature compensation, just can finish the zero-bit of capacitance differential pressure cell and the base measuring temperature of full scale and compensate, realize long-range demarcation.Simultaneously the present invention can also be converted into current signal with the voltage signal that characterizes the variation of electric capacity difference, is convenient to the use of follow-up particular elements or device.
Description of drawings
Fig. 1 is the structural representation of the capacitance pressure transmitter of embodiments of the invention 1.
Embodiment
Mode below by embodiment further specifies the present invention, but does not therefore limit the present invention among the described scope of embodiments.
Embodiment 1
The pressure capsule system of present embodiment comprises a capacitance pressure transmitter and a computing machine, and described computing machine provides zero-pressure instruction or full end finger order for described capacitance pressure transmitter.
Specifically, as shown in Figure 1, the capacitance pressure transmitter of present embodiment comprises a capacitor differential pressure transducer 1, a detuner 2, a MCU3, a HART communication module 4, AD421 chip 5, a temperature sensor 6 and an oscillator 7.
Wherein said detuner 2 is used for the electric capacity difference that described capacitor differential pressure transducer 1 generates is converted into analog voltage signal; Described MCU3 is used for the analog voltage signal of described detuner 2 outputs is 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 record its when receiving described zero-pressure instruction or full end finger and making, the digital voltage signal of described MCU3 output.Wherein said MCU3 only need to receive data and the instruction that HART communication module 4 transmits by serial ports, such as gathering when digital voltage signal corresponding to the pressure of leading zero etc., this HART agreement reception ﹠ disposal is finished by described HART communication module 4, by detecting corresponding to the fsk signal on the 4-20mA of described AD421 chip 5, and be included in the fsk signal information filtering out, and send to described MCU3 by serial ports.
Described temperature sensor 6 is for detection of the temperature of described capacitor differential pressure transducer 1 environment of living in.Described MCU3 also compensates the described digital voltage signal of its output based on described temperature correction.
Detuner described in the present embodiment 2 obtains the clock signal of 30KHz from described oscillator 7.The 4-20mA power supply conversion converter that described AD421 chip 5 is loop service is used for the digital voltage signal of described MCU3 output is converted into current signal.
The principle of work of the capacitance pressure transmitter of present embodiment is: when capacitor differential pressure transducer 1 detects pressure, corresponding variation also can occur in the electric capacity of corresponding capacitor differential pressure transducer 1, the described detuner 2 of supply of the 30KHz that simultaneously described oscillator 7 produces, described detuner 2 is converted to corresponding analog voltage signal to the amount of capacitance variations, and described analog voltage signal is through the analog to digital conversion output digital voltage signal of described MCU3.
Described MCU3 is based on the state of temperature of the capacitor differential pressure transducer 1 of described temperature sensor 6 collections simultaneously, described digital voltage signal is compensated, then output to described AD421 chip 5, described AD421 chip 5 converts digital voltage signal the current signal output of range of current between 4-20mA to.
The principle of work of in the pressure capsule system of present embodiment capacitance pressure transmitter being adjusted is as follows:
At first as mentioned above, described capacitance pressure transmitter is in normal operating conditions.
Then, when actual pressure was zero on guaranteeing capacitor differential pressure transducer 1, described computing machine provided the zero-pressure instruction to described capacitance pressure transmitter.This moment, described MCU3 detected in real time whether described HART communication module 4 receives instruction.
After this, when described MCU3 after definite described HART communication module 4 receives the zero-pressure instruction, described MCU3 record, the digital voltage signal that it is exported when described HART communication module 4 receives the zero-pressure instruction, and with it as the zero-point voltage signal, and then the zero-point correction value during as later pressure detection.
At last, can also carry out temperature compensation to described zero-point voltage signal based on the temperature that temperature sensor 6 detects at this moment, thereby reduce further error.
In like manner, when actual pressure was described capacitor differential pressure transducer 1 maximum detection piezometric power on guaranteeing capacitor differential pressure transducer 1, described computing machine provided full end finger order to described capacitance pressure transmitter.After this equally according to the flow process of above-mentioned really zeroing voltage signal, determine the full scale voltage signal of this moment, and the full scale corrected value during as later pressure detection.
Although more than described 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 limited by appended claims.Those skilled in the art can make various changes or modifications to these embodiments under the prerequisite that does not deviate from principle of the present invention and essence, but these changes and modification all fall into protection scope of the present invention.
Claims (9)
1. a capacitance pressure transmitter is characterized in that, described capacitance pressure transmitter comprises a capacitor differential pressure transducer, a detuner, a MCU and a communication module;
Described detuner is used for the electric capacity difference that described capacitor differential pressure transducer generates is converted into analog voltage signal; Described MCU is used for the analog voltage signal of described detuner output is converted into digital voltage signal;
Zero-pressure instruction or full end finger order that described MCU also receives based on described communication module, the digital voltage signal of described MCU output when recording described communication module and receiving described zero-pressure instruction or full end finger and make.
2. capacitance pressure transmitter as claimed in claim 1, it is characterized in that, described capacitance pressure transmitter comprises that also described MCU also compensates described digital voltage signal based on described temperature correction for detection of a temperature sensor of the temperature of described capacitor differential pressure transducer environment of living in.
3. capacitance pressure transmitter as claimed in claim 1 is characterized in that, described capacitance pressure transmitter also comprises a current conversion unit, is used for the digital voltage signal of described MCU output is converted into current signal.
4. capacitance pressure transmitter as claimed in claim 3 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 is characterized in that, described detuner obtains clock signal from an oscillator.
6. capacitance pressure transmitter as claimed in claim 5 is characterized in that, described clock signal is 30KHz.
7. such as each described capacitance pressure transmitter among the claim 1-6, it is characterized in that described communication module is the HART communication module.
8. pressure capsule system, it is characterized in that, described pressure capsule system comprises one or more such as each described capacitance pressure transmitter and a terminal among the claim 1-7, and described terminal is used to each capacitance pressure transmitter that zero-pressure instruction or full end finger order are provided.
9. pressure capsule system as claimed in claim 8 is characterized in that, described terminal is computing machine or PLC.
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| CN201210465854.8A CN102980715B (en) | 2012-11-16 | 2012-11-16 | Capacitance pressure transmitter and pressure capsule system |
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| CN201210465854.8A CN102980715B (en) | 2012-11-16 | 2012-11-16 | Capacitance pressure transmitter and pressure capsule system |
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| CN104807567A (en) * | 2014-01-24 | 2015-07-29 | 英飞凌技术德累斯顿有限责任公司 | 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 |
| US9546923B2 (en) | 2014-01-24 | 2017-01-17 | Infineon Technologies Dresden Gmbh | Sensor structures, systems and methods with improved integration and optimized footprint |
| CN107290101A (en) * | 2016-04-12 | 2017-10-24 | 原相科技股份有限公司 | Pressure measuring method and pressure measuring device |
| 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 |
| CN109253837A (en) * | 2017-07-14 | 2019-01-22 | 北京康斯特仪表科技股份有限公司 | The processing method of pressure calibration device and pressure gauge 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 |
| CN109443636A (en) * | 2018-11-13 | 2019-03-08 | 浙江大学 | A kind of dynamic response evaluating apparatus of strain-type pressure testing system |
| CN109724729A (en) * | 2018-12-29 | 2019-05-07 | 西南大学 | Wireless torque signal acquisition and receiving module and its control method |
| US10578507B2 (en) | 2016-04-12 | 2020-03-03 | Pixart Imaging Inc. | Pressure measuring method and pressure measuring apparatus |
| CN111649871A (en) * | 2019-03-04 | 2020-09-11 | 英飞凌科技股份有限公司 | Detecting contamination of pressure sensors based on cross-sensitivity to acceleration |
| WO2021258426A1 (en) * | 2020-06-23 | 2021-12-30 | 深圳市汇顶科技股份有限公司 | Capacitance detection apparatus and electronic device |
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Cited By (20)
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| US9546923B2 (en) | 2014-01-24 | 2017-01-17 | Infineon Technologies Dresden Gmbh | Sensor structures, systems and methods with improved integration and optimized footprint |
| CN104807567B (en) * | 2014-01-24 | 2018-02-13 | 英飞凌技术德累斯顿有限责任公司 | Sensor construction, system and method with improved integrated and optimization encapsulation |
| US10060816B2 (en) | 2014-01-24 | 2018-08-28 | Infineon Technologies Ag | Sensor structures, systems and methods with improved integration and optimized footprint |
| CN104807567A (en) * | 2014-01-24 | 2015-07-29 | 英飞凌技术德累斯顿有限责任公司 | 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 |
| US10578507B2 (en) | 2016-04-12 | 2020-03-03 | Pixart Imaging Inc. | Pressure measuring method and pressure measuring apparatus |
| CN107290101A (en) * | 2016-04-12 | 2017-10-24 | 原相科技股份有限公司 | Pressure measuring method and pressure measuring device |
| US10955308B2 (en) | 2016-04-12 | 2021-03-23 | Pix Art Imaging Inc. | Pressure measuring method and pressure measuring apparatus |
| CN108885144B (en) * | 2016-11-23 | 2021-03-16 | 深圳市汇顶科技股份有限公司 | Pressure detection method, device and equipment |
| 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 |
| CN109253837A (en) * | 2017-07-14 | 2019-01-22 | 北京康斯特仪表科技股份有限公司 | The processing method of pressure calibration device and pressure gauge calibration information |
| 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 |
| US11209332B2 (en) | 2017-07-14 | 2021-12-28 | Beijing Const Instruments Technology Inc. | Pressure calibration apparatus and pressure instrument calibration information processing method |
| 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 |
| CN109443636A (en) * | 2018-11-13 | 2019-03-08 | 浙江大学 | A kind of dynamic response evaluating apparatus of strain-type pressure testing system |
| CN109724729A (en) * | 2018-12-29 | 2019-05-07 | 西南大学 | Wireless torque signal acquisition and receiving module and its control method |
| CN109724729B (en) * | 2018-12-29 | 2020-12-04 | 西南大学 | Wireless torque signal acquisition and receiving module and control method thereof |
| CN111649871A (en) * | 2019-03-04 | 2020-09-11 | 英飞凌科技股份有限公司 | Detecting contamination of pressure sensors based on cross-sensitivity to acceleration |
| WO2021258426A1 (en) * | 2020-06-23 | 2021-12-30 | 深圳市汇顶科技股份有限公司 | Capacitance detection apparatus and electronic device |
| US11366549B2 (en) | 2020-06-23 | 2022-06-21 | Shenzhen GOODIX Technology Co., Ltd. | Capacitance detection apparatus and electronic device |
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Denomination of invention: Capacitive pressure transmitter and pressure sensing system Effective date of registration: 20220623 Granted publication date: 20151230 Pledgee: Industrial and Commercial Bank of China Limited Shanghai Songjiang sub branch Pledgor: SHANGHAI ZHAOHUI PRESSURE APPARATUS Co.,Ltd. Registration number: Y2022310000081 |