CN201293698Y - Pressure transmitter with temperature compensation circuit - Google Patents

Pressure transmitter with temperature compensation circuit Download PDF

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Publication number
CN201293698Y
CN201293698Y CNU2008202227217U CN200820222721U CN201293698Y CN 201293698 Y CN201293698 Y CN 201293698Y CN U2008202227217 U CNU2008202227217 U CN U2008202227217U CN 200820222721 U CN200820222721 U CN 200820222721U CN 201293698 Y CN201293698 Y CN 201293698Y
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CN
China
Prior art keywords
temperature
circuit
pressure
compensation
signal
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNU2008202227217U
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Chinese (zh)
Inventor
谷荣祥
丁明东
来军平
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XI'AN CHINASTAR M&C Ltd
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XI'AN CHINASTAR M&C Ltd
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Priority to CNU2008202227217U priority Critical patent/CN201293698Y/en
Application granted granted Critical
Publication of CN201293698Y publication Critical patent/CN201293698Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a pressure transformer with a temperature compensation circuit, which comprises a pressure sensor, and a signal modulation circuit connected with the pressure sensor for converting the output signals of the pressure transformer into standard current signals of 4 to 20mA, wherein the pressure sensor is a piezoresistive pressure sensor, comprising a wheatstone bridge composed by strain gauge made from diffusion silicon. The pressure transformer further comprises a temperature sampling circuit for detecting the working temperature of the wheatstone bridge. The signal modulation circuit is composed of a signal adjusting circuit for amplifying, nonlinearly compensating the output signals of the and processing temperature compensation piezoresistive pressure sensor, and a V/I conversion circuit connected with the signal adjusting circuit; and the temperature sampling circuit is connected with the signal adjusting circuit. The pressure transformer has simple and reasonable structure, less elements, low cost, stable and reliable working performance, and can effectively resolve the temperature drift problem of prior pressure transformer.

Description

The pressure unit of band temperature-compensation circuit
Technical field
The utility model relates to a kind of pressure unit, especially relates to a kind of pressure unit that is used for the band temperature-compensation circuit of industrial control fields such as fluid pressure, flow and liquid level.
Background technology
Piezoresistive pressure sensor is one of most widely used pressure transducer, and it is to utilize the piezoresistive effect of silicon and microelectric technique to make, have highly sensitive, dynamic response good, accuracy is high, it is microminiaturized to be easy to and characteristics such as integrated.But because it is made by semiconductor material, so the output valve of sensor not only is decided by also can be subjected to the pressure imported the influence of variation of ambient temperature, thereby produce the temperature drift phenomenon.Add itself existing nonlinear problem, the stress influence that device is subjected in the encapsulation process process makes measuring accuracy be difficult to satisfy the needs that precision pressure is measured.
Pressure transducer is one type very important in the sensor world, it has realized seriation, standardization substantially, and further to miniaturization, collectivization, intelligent and high precision direction develops, but zero point drift, temperature drift, non-linear problem remains the problem that does not solve fully as yet, and temperature drift produces cross sensitivity, is the most important reason that influences sensor accuracy.The method that solves temperature drift is temperature compensation, and hardware compensating method and software compensation method are arranged.Hardware compensating mainly is to adopt hardware circuit to eliminate its influence, but is difficult to accomplish compensation in full, and has problem such as compensating circuit hardware drift; Software compensation can be divided into numerical analysis method and artificial intelligence method, mainly is least square fitting and the match of multistage polygometry in the numerical analysis method, but because the imperfection of itself algorithm can not carry out complete match to data.
At present, the general temperature drift of the pressure unit that exists on the market is excessive, reach 1% more than in full warm area drift, and high-precision pressure unit cost is higher, the transmitter price of a full warm area 0.2% precision is often at 2000 yuan, and a lot of users do not bear high price like this on the market.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of pressure unit with temperature-compensation circuit is provided, its simple and reasonable, used device is few and cost is low, stable and reliable working performance, can effectively solve the temperature drift problem of existing pressure unit.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of pressure unit with temperature-compensation circuit, comprise pressure transducer and join with it and described pressure transducer institute output signal is converted to the signal modulation circuit of 4-20mA normalized current signal, it is characterized in that: described pressure transducer is piezoresistive pressure sensor and its Wheatstone bridge for being made up of the foil gauge of diffuse si system, also comprise the temperature sampling circuit that the working temperature to Wheatstone bridge detects, described signal modulation circuit is by piezoresistive pressure sensor institute output signal is amplified, the signal conditioning circuit of nonlinear compensation and temperature compensation and the V/I change-over circuit composition that joins with signal conditioning circuit, described temperature sampling circuit connects signal conditioning circuit.
The driving source of described Wheatstone bridge is constant current source excitation and its negative energize end ground connection after resistance R, and described negative energize end is the temperature acquisition point of temperature sampling circuit to Wheatstone bridge.
Described signal conditioning circuit is chip PGA309.
Described V/I change-over circuit is chip XTR117.
Described temperature sampling circuit is a digital temperature sensor.
The utility model compared with prior art has the following advantages, and 1, not only simple and reasonable, used device is few and cost is low, processing and fabricating is convenient, it is easy and simple to handle to use; 2, adopt common diffuse si core body, the temperature-compensation circuit by special use compensates temperature, can the free migration range, change gain, can couple zero migration and gain carry out fine adjustment; In addition, by the band limit filtering of input end and output terminal, it is minimum that output noise is dropped to; 3, its temperature-compensation circuit adopts digital form, can obtain the calibration value of 17 temperature spots at most, even the drift of temperature reaches 15%, also it can be calibrated successfully accurately, reaches 0.2% synthesis precision at-40 to 80 ℃, and low cost is highly reliable; Its temperature sampling has adopted the mode of measuring Wheatstone bridge resistance, can avoid like this owing to temperature changes the excessive problem of systematic error that causes suddenly; 4, applied widely, be widely used in the industries such as Aeronautics and Astronautics, oil, chemical industry, mine, machinery, dam, geology, the hydrology, be used to measure the pressure of all gases and fluid.In a word, circuit cost of the present utility model is very low, and the few and stable and reliable working performance of device can effectively solve the temperature drift problem that has pressure unit now, has realized good cost performance, has very big competitive edge on market.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of Wheatstone bridge among Fig. 1.
Description of reference numerals:
The 1-piezoresistive pressure sensor; The 3-signal conditioning circuit; The 4-V/I change-over circuit;
The 5-temperature sampling circuit.
Embodiment
As shown in Figure 1, the utility model comprises pressure transducer and joins with it and described pressure transducer institute output signal is converted to the signal modulation circuit of 4-20mA normalized current signal, wherein, described pressure transducer is piezoresistive pressure sensor 1 and its Wheatstone bridge for being made up of the foil gauge of diffuse si system, also comprise the temperature sampling circuit 5 that the working temperature to Wheatstone bridge detects, described signal modulation circuit is by 1 output signal of piezoresistive pressure sensor is amplified, the signal conditioning circuit 3 of nonlinear compensation and temperature compensation and V/I change-over circuit 4 compositions that join with signal conditioning circuit 3, described temperature sampling circuit 5 connects signal conditioning circuit 3.
In conjunction with Fig. 2, the driving source of described Wheatstone bridge is constant current source excitation and its negative energize end ground connection after resistance R, and described negative energize end is the temperature acquisition point of 5 pairs of Wheatstone bridges of temperature sampling circuit.
In the present embodiment, described signal conditioning circuit 3 is chip PGA309, and V/I change-over circuit 4 is chip XTR117.The concrete course of work is: the pressure signal that described Wheatstone bridge strain produces passes to conditioning chip PGA309, this chip has been realized amplification, nonlinear compensation and the temperature compensation of signal, pressure signal outputs to chip XTR117 with the form of voltage the most at last, and chip XTR117 converts voltage signal to voltage stabilizing that current signal and this chip have also been realized system.Described temperature sampling circuit 5 is a digital temperature sensor, promptly adopts numeral to demarcate the mode of calibration, specifically is to adopt the mode of measuring the bridge resistance to measure temperature and adopt the calibrating mode of 5 temperature spots.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.

Claims (5)

1. pressure unit with temperature-compensation circuit, comprise pressure transducer and join with it and described pressure transducer institute output signal is converted to the signal modulation circuit of 4-20mA normalized current signal, it is characterized in that: described pressure transducer is piezoresistive pressure sensor (1) and its Wheatstone bridge for being made up of the foil gauge of diffuse si system, also comprise the temperature sampling circuit (5) that the working temperature to Wheatstone bridge detects, described signal modulation circuit is by piezoresistive pressure sensor (1) institute output signal is amplified, signal conditioning circuit of nonlinear compensation and temperature compensation (3) and V/I change-over circuit (4) composition that joins with signal conditioning circuit (3), described temperature sampling circuit (5) connects signal conditioning circuit (3).
2. according to the pressure unit of the described band temperature-compensation circuit of claim 1, it is characterized in that: the driving source of described Wheatstone bridge is constant current source excitation and its negative energize end ground connection after resistance R, and described negative energize end is the temperature acquisition point of temperature sampling circuit (5) to described Wheatstone bridge.
3. according to the pressure unit of claim 1 or 2 described band temperature-compensation circuits, it is characterized in that: described signal conditioning circuit (3) is chip PGA309.
4. according to the pressure unit of claim 1 or 2 described band temperature-compensation circuits, it is characterized in that: described V/I change-over circuit (4) is chip XTR117.
5. according to the pressure unit of claim 1 or 2 described band temperature-compensation circuits, it is characterized in that: described temperature sampling circuit (5) is a digital temperature sensor.
CNU2008202227217U 2008-12-02 2008-12-02 Pressure transmitter with temperature compensation circuit Expired - Fee Related CN201293698Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008202227217U CN201293698Y (en) 2008-12-02 2008-12-02 Pressure transmitter with temperature compensation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008202227217U CN201293698Y (en) 2008-12-02 2008-12-02 Pressure transmitter with temperature compensation circuit

Publications (1)

Publication Number Publication Date
CN201293698Y true CN201293698Y (en) 2009-08-19

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CN (1) CN201293698Y (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101936791A (en) * 2010-07-28 2011-01-05 四川蜀谷仪表科技有限公司 Digital pressure gauge
CN102645293A (en) * 2012-04-25 2012-08-22 无锡商业职业技术学院 Intelligent pressure transmitter
CN102865951A (en) * 2012-09-26 2013-01-09 太原理工大学 Piezoresistive sensor for internal pressure detection of expressway road bed
CN103017798A (en) * 2012-12-14 2013-04-03 烟台荏原空调设备有限公司 Resistance transmitter
CN103335778A (en) * 2013-06-27 2013-10-02 苏州中崟传感股份有限公司 Diesel engine urea solution pressure sensor
CN103913266A (en) * 2013-01-05 2014-07-09 上海朝辉压力仪器有限公司 Pressure sensor and pressure transmitter
CN104061978A (en) * 2014-06-17 2014-09-24 西安微纳传感器研究所有限公司 Intelligent liquid level transmitter and control method thereof
CN104516387A (en) * 2014-12-12 2015-04-15 天津大学 Constant flow source supply circuit of respiration signal sensor based on air cushion bed
KR20150066514A (en) * 2012-07-20 2015-06-16 엔도피스 홀딩스, 엘엘시 Transducer interface system and method
CN105242063A (en) * 2015-09-09 2016-01-13 西安邮电大学 Reservoir flow velocity measurement method based on pressure sensor
CN105579820A (en) * 2013-09-19 2016-05-11 恩德莱斯和豪瑟尔两合公司 Pressure transducer
CN105973509A (en) * 2016-05-06 2016-09-28 武汉航空仪表有限责任公司 Pressure transducer circuit and commissioning method thereof
CN110530568A (en) * 2019-10-09 2019-12-03 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) A kind of encapsulation integrated form stress monitoring sensor
CN111380645A (en) * 2018-12-28 2020-07-07 罗斯蒙特公司 Remote seal system with improved temperature compensation

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101936791A (en) * 2010-07-28 2011-01-05 四川蜀谷仪表科技有限公司 Digital pressure gauge
CN102645293A (en) * 2012-04-25 2012-08-22 无锡商业职业技术学院 Intelligent pressure transmitter
KR101998915B1 (en) 2012-07-20 2019-10-01 엔도피스 홀딩스, 엘엘시 Transducer interface system and method
KR20150066514A (en) * 2012-07-20 2015-06-16 엔도피스 홀딩스, 엘엘시 Transducer interface system and method
CN102865951A (en) * 2012-09-26 2013-01-09 太原理工大学 Piezoresistive sensor for internal pressure detection of expressway road bed
CN102865951B (en) * 2012-09-26 2015-02-25 太原理工大学 Piezoresistive sensor for internal pressure detection of expressway road bed
CN103017798A (en) * 2012-12-14 2013-04-03 烟台荏原空调设备有限公司 Resistance transmitter
CN103913266A (en) * 2013-01-05 2014-07-09 上海朝辉压力仪器有限公司 Pressure sensor and pressure transmitter
CN103335778B (en) * 2013-06-27 2016-01-20 苏州中崟传感股份有限公司 Diesel engine urea solution pressure sensor
CN103335778A (en) * 2013-06-27 2013-10-02 苏州中崟传感股份有限公司 Diesel engine urea solution pressure sensor
US9897502B2 (en) 2013-09-19 2018-02-20 Endress + Hauser Gmbh + Co. Kg Pressure transducer
CN105579820A (en) * 2013-09-19 2016-05-11 恩德莱斯和豪瑟尔两合公司 Pressure transducer
CN105579820B (en) * 2013-09-19 2018-05-04 恩德莱斯和豪瑟尔两合公司 Pressure transmitter
CN104061978A (en) * 2014-06-17 2014-09-24 西安微纳传感器研究所有限公司 Intelligent liquid level transmitter and control method thereof
CN104516387B (en) * 2014-12-12 2017-05-17 天津大学 Constant flow source supply circuit of respiration signal sensor based on air cushion bed
CN104516387A (en) * 2014-12-12 2015-04-15 天津大学 Constant flow source supply circuit of respiration signal sensor based on air cushion bed
CN105242063A (en) * 2015-09-09 2016-01-13 西安邮电大学 Reservoir flow velocity measurement method based on pressure sensor
CN105973509A (en) * 2016-05-06 2016-09-28 武汉航空仪表有限责任公司 Pressure transducer circuit and commissioning method thereof
CN105973509B (en) * 2016-05-06 2019-10-15 武汉航空仪表有限责任公司 A kind of pressure sensor circuit and its adjustment method
CN111380645A (en) * 2018-12-28 2020-07-07 罗斯蒙特公司 Remote seal system with improved temperature compensation
CN110530568A (en) * 2019-10-09 2019-12-03 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) A kind of encapsulation integrated form stress monitoring sensor
CN110530568B (en) * 2019-10-09 2021-01-29 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) Packaged integrated stress monitoring sensor

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GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090819

Termination date: 20171202