CN102768096A - Pressure measuring device with temperature drift compensation function - Google Patents

Pressure measuring device with temperature drift compensation function Download PDF

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Publication number
CN102768096A
CN102768096A CN2012102628904A CN201210262890A CN102768096A CN 102768096 A CN102768096 A CN 102768096A CN 2012102628904 A CN2012102628904 A CN 2012102628904A CN 201210262890 A CN201210262890 A CN 201210262890A CN 102768096 A CN102768096 A CN 102768096A
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China
Prior art keywords
module
diode
drift compensation
temperature
temperature drift
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CN2012102628904A
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CN102768096B (en
Inventor
宋晓渊
汤云杰
夏华龙
潘日虎
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Shanghai Aijia Electronic Technology Co., Ltd.
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SHANGHAI DACHAO ELECTRONIC TECHNOLOGY Co Ltd
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Abstract

The invention discloses a pressure measuring device with a temperature drift compensation function. The pressure measuring device comprises a power/battery module consisting of a first power output end. The pressure measuring device is characterized in that the power/battery module is connected with one end of a pressure sensor module by a first diode, the other end of the pressure sensor module is grounded by a second diode, an output end of the pressure sensor module is connected with an input end of an amplifier and an input end of an A/D (analog/digital) module, the input end of the amplifier and the input end of the A/D module are further connected with an output end of a temperature sensing module, an output end of the amplifier and an output end of the A/D module are connected with an input end of an information processing module, and an output end of the information processing module is connected with a pressure measuring output module. The pressure measuring device has the advantages of simple compensation circuit, easiness in production and calibration, remarkable compensation effect, low cost and the like.

Description

The device for pressure measurement of band temperature drift compensation
Technical field
The present invention relates to a kind of device for pressure measurement, belong to the device for pressure measurement field with temperature drift compensation.
Background technology
The common working pressure sensor of device for pressure measurement.Pressure transducer commonly used is a kind of semiconductor mechanical quantity Sensitive Apparatus, forms electric bridge usually, and its parameter is acted upon by temperature changes very big, and this influence is commonly referred to temperature drift (being called for short " temperature is floated ").The main temperature of pressure transducer float be Sensitivity Temperature float with zero point temperature float.
Document " mechanical quantity Sensitive Apparatus and application thereof " ((Beijing) Science Press; 1987) proposition is a kind of floats the method that compensates to the pressure transducer Sensitivity Temperature, and its principle is to utilize diode when forward uses (being that the diode cathode current potential is higher than negative pole), to be equivalent to the characteristic of the resistance of negative temperature coefficient.As shown in Figure 1, an end ground connection of pressure transducer in pressure sensor module excitation input, the other end meets the first power output end VD1 after meeting the 4th diode D4 that at least one forward uses.But through analyzing or experiment can be known, this method that connects can be aggravated the temperature at zero point of pressure transducer and floated.
Document " temperature Compensation of Pressure Sensor " (robotization and instrument; 2002 the 3rd phases) proposition is a kind of floats the device that compensates to pressure transducer temperature at zero point; Utilize single-chip microcomputer and temperature sensor to be recorded in the storer, during pressure survey, measure temperature at that time simultaneously at the zero-point voltage of whole operating temperature range with pressure transducer; The output voltage of pressure transducer is deducted the zero-point voltage of this temperature in the storer, compensate the zero point temperature with this and float.But; This device temperature drift compensation at zero point is not rejected the influence that Sensitivity Temperature is floated under the same pressure of pressure transducer; Compensation precision is not high, and how the document keeps linear output and low cost not to propose concrete implementation in bigger operating temperature range to this device critical component temperature sensor.
How designing a kind of Sensitivity Temperature and float and higher and the device for pressure measurement that cost is low of temperature drift compensation efficient at zero point, is that person skilled is made great efforts the problem that solves.
Summary of the invention
The objective of the invention is to solve Sensitivity Temperature and float and the inefficient problem of temperature drift compensation at zero point, the device for pressure measurement that a kind of compensating circuit is simple, produce the band temperature drift compensation that demarcation is easy, compensation effect is remarkable, with low cost is provided.
In order to achieve the above object; The invention provides a kind of device for pressure measurement with temperature drift compensation; Comprise power supply/battery module, power supply/battery module comprises first power output end, it is characterized in that; Described power supply/battery module is connected with an end of pressure sensor module through first diode; The other end of pressure sensor module is connected with ground through second diode, and the output terminal of pressure sensor module is connected with the input end of amplifier and A/D module, and the input end of amplifier and A/D module also is connected with the output terminal of temperature sense module; The output terminal of amplifier and A/D module is connected with the input end of message processing module, and the output terminal of message processing module is connected with the pressure survey output module.
Preferably, described message processing module comprise the temperature drift compensation data-carrier store and zero point the temperature drift compensation module.
Preferably, described temperature sense module comprises the 3rd diode and the resistance that at least one forward uses, and the negative pole of the 3rd diode is connected with ground, the positive pole of the 3rd diode respectively with amplifier and A/D module and resistance in series after power output end be connected.
Preferably, the two ends of described pressure sensor module connect first diode and second diode that at least one forward uses respectively, and the difference of the number of the number of first diode and second diode is not more than one.
The present invention adopts first diode and the second diode pair sensitivity temperature drift compensation that is sub-packed in pressure transducer excitation two ends; Adopt the diode sample temperature variation preferably of wide temperature range output linearity, circuit is simple, and element need not to select coupling; The production staking-out work is simplified easily; Have and reduce cost, reach the good result of higher measuring accuracy simultaneously, compensation effect is remarkable.
Description of drawings
Fig. 1 is traditional composition synoptic diagram with diode pair pressure transducer sensitivity temperature drift compensation;
Fig. 2 is a kind of composition synoptic diagram of the device for pressure measurement with temperature drift compensation.
Description of reference numerals
VD1 is first power output end, and VD2 is the second source output terminal, and D1 is first diode, and D2 is second diode, and D3 is the 3rd diode, and D4 is the 4th diode, and R is a resistance.
Embodiment
For making the present invention more obviously understandable, now with preferred embodiment, and conjunction with figs. elaborates as follows.
Following examples provide to those of ordinary skills and realize and use of the present inventionly, but are not in order to limiting the present invention, anyly do not break away from the modification that the spirit and scope of the present invention are done, and still are included in the scope of patent protection of the present invention.Protection scope of the present invention is as the criterion with what claims defined.
Embodiment 1
The present invention is a kind of device for pressure measurement with temperature drift compensation, and is as shown in Figure 2, is a kind of composition synoptic diagram of the device for pressure measurement with temperature drift compensation.Present embodiment is a kind of engine oil pressure pickup, and operating temperature range is very wide, is-40 ℃ to+125 ℃, and reaches higher measuring accuracy.Pressure sensor module comprises the pressure transducer and initial zero-regulator resistor that adopts the silicon piezoresistive transducer chip; The two ends of pressure sensor module excitation input connect the first power output end VD1 and the ground that connects power supply/battery module behind the temperature drift compensation diode that a forward uses again respectively respectively; Promptly the first power output end VD1 connects the positive pole of temperature drift compensation first a diode D1; The negative pole of the temperature drift compensation first diode D1 connects an end of pressure sensor module excitation input; The positive pole of another temperature drift compensation of its another termination second diode D2, the temperature drift compensation second diode D2 minus earth.The temperature sense module is made up of the 3rd diode D3 and resistance, and the 3rd diode D3 forward in-40 ℃ to+125 ℃ temperature ranges uses, and its output changes still can keep better linearity.The 3rd diode D3 minus earth, the anodal work meets second source output terminal VD2 behind the output parallel-series resistance.The output of pressure sensor module inserts amplifier and A/D module; The output of temperature sense module also inserts amplifier and A/D module, by amplifier and A/D module the pressure signal that obtains and temperature signal is amplified back A/D and converts digital quantity into and be transferred to message processing module.Message processing module comprise the temperature drift compensation data-carrier store and zero point the temperature drift compensation module, one of their implementation method is to use and comprises that microcontroller adds and write computer program and realize.
The present invention is producing timing signal; Zero point, the temperature drift compensation module can be to the output of temperature sense module and the output sampling and the A/D conversion of pressure sensor module in daily atmospheric pressure and full operating temperature range; Be recorded in non-volatile temperature drift compensation data-carrier store; The flash memory in the microcontroller (FLASH) for example, zero point, the temperature drift compensation module read the relation table of setting up the temperature and pressure sensor zero point after the data in the temperature drift compensation data-carrier store.
During surveying work of the present invention, the temperature drift compensation module can be used this relation table the temperature drift compensation at zero point was carried out in the output of pressure sensor module zero point.The temperature drift compensation first diode D1, the temperature drift compensation second diode D2 have floated the pressure transducer Sensitivity Temperature and have compensated; Therefore; Through Sensitivity Temperature float with the zero point temperature drift compensation after the pressure measuring value precision higher, can export through the pressure survey output module.The pressure survey output module generally includes digital signal output buffer or serial data delivery outlet or D/A converter or PWM (width modulation) delivery outlet, respectively with the form output pressure measured value of parallel data, serial data, voltage/current amount, pwm signal.
The diode at pressure transducer of the present invention excitation two ends adopts respectively holds one, also can respectively hold a plurality ofly, and its sum floats coefficient with the Sensitivity Temperature of pressure transducer and is directly proportional.The number of the first diode D1 at pressure transducer excitation two ends equates as far as possible that with the number of the second diode D2 difference of both quantity is not more than one, floats to reduce the temperature at zero point that causes thus.
The 3rd diode D3 that the forward of temperature sense module of the present invention uses can adopt a plurality of series connection; Promptly respectively the negative pole of the 3rd diode D3 is connected with the positive pole of another the 3rd diode D3; The minus earth of last the 3rd diode D3; Meet second source output terminal VD2 behind the cathode series resistance R of the junior one the 3rd a diode D3, and this positive pole is done the output of temperature sense module.Can increase the sensitivity of temperature sense module output like this.

Claims (4)

1. device for pressure measurement with temperature drift compensation; Comprise power supply/battery module; Power supply/battery module comprises first power output end (VD1); It is characterized in that described power supply/battery module is connected with an end of pressure sensor module through first diode (D1), the other end of pressure sensor module is connected with ground through second diode (D2); The output terminal of pressure sensor module is connected with the input end of amplifier and A/D module; The input end of amplifier and A/D module also is connected with the output terminal of temperature sense module, and the output terminal of amplifier and A/D module is connected with the input end of message processing module, and the output terminal of message processing module is connected with the pressure survey output module.
2. a kind of device for pressure measurement with temperature drift compensation as claimed in claim 1 is characterized in that, described message processing module comprise the temperature drift compensation data-carrier store and zero point the temperature drift compensation module.
3. a kind of device for pressure measurement as claimed in claim 1 with temperature drift compensation; It is characterized in that; Described temperature sense module comprises the 3rd diode (D3) and the resistance (R) that at least one forward uses; The negative pole of the 3rd diode (D3) is connected with ground, the positive pole of the 3rd diode (D3) respectively with amplifier and A/D module and resistance in series (R) after power output end (VD2) be connected.
4. a kind of device for pressure measurement as claimed in claim 1 with temperature drift compensation; It is characterized in that; The two ends of described pressure sensor module connect first diode (D1) and second diode (D2) that at least one forward uses respectively, and the difference of the number of the number of first diode (D1) and second diode (D2) is not more than one.
CN201210262890.4A 2012-07-27 2012-07-27 Pressure measuring device with temperature drift compensation function Active CN102768096B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103278269A (en) * 2013-04-24 2013-09-04 武汉航空仪表有限责任公司 Temperature compensation method for high accuracy pressure transmitter
CN108151919A (en) * 2017-11-17 2018-06-12 中国电子科技集团公司第四十八研究所 A kind of pressure sensor temperature drift compensation circuit and compensation method
WO2018176199A1 (en) * 2017-03-27 2018-10-04 深圳市汇顶科技股份有限公司 Piezoresistive sensor, pressure detection device, and electronic device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147700A2 (en) * 1983-12-13 1985-07-10 Honeywell Inc. Apparatus for temperature compensation in a digital data handling system
CN1030475A (en) * 1987-07-03 1989-01-18 吉林工业大学 Strain differential capacitance type load transducer
JP2002048597A (en) * 2000-07-31 2002-02-15 Tanita Corp Span temperature compensating circuit
CN201754115U (en) * 2010-07-28 2011-03-02 四川蜀谷仪表科技有限公司 Digital pressure meter
CN102032974A (en) * 2010-11-15 2011-04-27 浙江工商大学 Temperature compensation method for pressure sensor
CN202853834U (en) * 2012-07-27 2013-04-03 上海大潮电子技术有限公司 Pressure measuring device with temperature drift compensation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147700A2 (en) * 1983-12-13 1985-07-10 Honeywell Inc. Apparatus for temperature compensation in a digital data handling system
CN1030475A (en) * 1987-07-03 1989-01-18 吉林工业大学 Strain differential capacitance type load transducer
JP2002048597A (en) * 2000-07-31 2002-02-15 Tanita Corp Span temperature compensating circuit
CN201754115U (en) * 2010-07-28 2011-03-02 四川蜀谷仪表科技有限公司 Digital pressure meter
CN102032974A (en) * 2010-11-15 2011-04-27 浙江工商大学 Temperature compensation method for pressure sensor
CN202853834U (en) * 2012-07-27 2013-04-03 上海大潮电子技术有限公司 Pressure measuring device with temperature drift compensation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103278269A (en) * 2013-04-24 2013-09-04 武汉航空仪表有限责任公司 Temperature compensation method for high accuracy pressure transmitter
WO2018176199A1 (en) * 2017-03-27 2018-10-04 深圳市汇顶科技股份有限公司 Piezoresistive sensor, pressure detection device, and electronic device
CN108151919A (en) * 2017-11-17 2018-06-12 中国电子科技集团公司第四十八研究所 A kind of pressure sensor temperature drift compensation circuit and compensation method

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Owner name: SHANGHAI AIJIA ELECTRONIC TECHNOLOGY CO., LTD.

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Patentee before: Shanghai Dachao Electronic Technology Co., Ltd.