CN103234689A - Circuit of high-accuracy pressure transmitter - Google Patents
Circuit of high-accuracy pressure transmitter Download PDFInfo
- Publication number
- CN103234689A CN103234689A CN2013101454030A CN201310145403A CN103234689A CN 103234689 A CN103234689 A CN 103234689A CN 2013101454030 A CN2013101454030 A CN 2013101454030A CN 201310145403 A CN201310145403 A CN 201310145403A CN 103234689 A CN103234689 A CN 103234689A
- Authority
- CN
- China
- Prior art keywords
- pressure
- resistance
- pressure transmitter
- positive
- circuit
- Prior art date
- 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.)
- Pending
Links
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The invention belongs to a pressure sensing technique and relates to circuit design of a high-accuracy pressure transmitter. In combination with the transmission characteristics of a piezoresistive SOI (Silicon on Insulator) pressure-sensitive device and a differential amplification circuit at different temperature conditions, the compensation of the temperature error of the output signal of the pressure transmitter is realized through a precision resistor network. Commonly used temperature compensation devices such as thermistors and diodes are not needed to be used in the circuit of the high-accuracy pressure transmitter, the temperature compensation of the pressure transmitter is realized only through four groups of precision fixed resistors and the errors of the pressure transmitter are reduced; and the applicable temperature range of the pressure transmitter which is designed by using the circuit is negative 55 DEG C to 175 DEG C and the output errors within the full temperature range are smaller than plus or minus 0.5% FS. The high-accuracy pressure transmitter has the advantages of small size, light weight, strong interference-resistant capability, stable output and simple and convenient technological process, and is suitable for large-scale production.
Description
Technical field
The invention belongs to the circuit design technique of aviation pressure unit, relate to a kind of circuit of pressure unit.
Background technology
Pressure unit is the electric signal that the pressure signal that needs are measured is converted into regulation, and electrical signal transfer is given the device of indicator or computing machine.Along with the development of aircraft industry, require pressure unit precision height, good stability, volume little, in light weight; Can adapt to bad working environment, be-55 ℃～175 ℃ as operating ambient temperature range, and contain complicated electromagnetic interference signal in working environment.The high-precision pressure transmitter is invented the demand of high-end pressure unit in order to satisfy aircraft industry.The realization key of high-precision pressure transmitter depends on circuit design and temperature compensation.At present, the high-precision pressure transmitter generally adopts the method for digital compensation to realize; And the maximum operating temperature of domestic and international military digital device and special conditioning chip such as A/D conversion at present, microprocessor, D/A converter etc. is 125 ℃, can't satisfy the request for utilization under the higher temperature condition.And analog temperature compensation adopts devices such as thermistor, diode to realize usually, adopts the temperature compensation by thermistor precision not high, adopts the diode temperature compensating circuit comparatively complicated; And common compensation method debug process complexity, temperature accommodation is narrower, and less stable is difficult to satisfy aircraft industry to the requirement of pressure unit.
Summary of the invention
The purpose of this invention is to provide a kind of high-precision pressure transmitter circuit.
The technical scheme that the present invention takes is: comprise constant current source (1), pressure resistance type SOI pressure-sensitive component (2), adjustable resistance Rp1～Rp4, double operational differential amplifier circuit; This steps on the quick electric bridge of four arm strengths to pressure resistance type SOI pressure-sensitive component (2) for favour, has 5 contacts, and wherein node d, e are positive power source terminal, and node b is negative power end, is connected with flowing into to hold with the outflow of constant current source respectively; Node a, c are respectively positive-negative output end, are connected with the positive and negative input end of differential amplifier circuit respectively; Adjustable resistance Rp3 one end links to each other with pressure resistance type SOI pressure-sensitive component (2) node d, and the other end links to each other with constant current source (1) outflow end; Adjustable resistance Rp2 is connected in parallel between pressure resistance type SOI pressure-sensitive component (2) positive power source terminal and the positive output end; Adjustable resistance Rp1 is connected in parallel between pressure resistance type SOI pressure-sensitive component (2) the positive-negative power end, links to each other by adjustable resistance Rp4 between two operational amplifier positive input terminals.
Further, above-mentioned double operational differential amplifier circuit is made up of the step low-pass KRC active filter (3,4) of two independent symmetries, and the first step low-pass KRC active filter (3) comprises resistance R 1, R2, R3; Capacitor C 1, C2; Operational amplifier N1; One end of resistance R 1 is signal input part, and the other end is divided into two branch roads, and a branch road links to each other with operational amplifier N1 positive input terminal by R2, and another branch road links to each other with operational amplifier N1 negative input end by capacitor C 1; Resistance R 2 connects signal ground with operational amplifier N1 negative input end by capacitor C 2; Operational amplifier positive input terminal and output terminal are parallel with resistance R 3, the second step low-pass KRC active filters (4) and comprise resistance R 5, R6, R7; Capacitor C 3, C4; Operational amplifier N2; Its syndeton and parameter value and the first step low-pass KRC active filter (3) are identical.
The present invention has beneficial effect: this circuit structure is comparatively simple, provides the basis for realizing product miniaturization design; Need not carry out single compensation to pressure-sensitive component separately, can shorten production, procurement cycle, reduce cost of products; Precision metallic film fixed resistance is only adopted in the output adjustment of pressure transducer and temperature compensation, and does not use thermistor (precision is lower) and diode devices such as (circuit are comparatively complicated), can simplify compensating circuit, improves the compensation precision of pressure transducer; The output adjustment of pressure transducer is controlled with two groups of different resistance respectively with temperature compensation, the method that presets by initial resistance, can avoid influencing each other between two groups of resistance (Rp1, Rp2 and Rp3, Rp4) preferably, namely independently carry out respectively in the debugging of initial temperature T0 and compensation temperature T1, avoid debugging repeatedly under different temperature points, simplified debug process.
This circuit has designed two independent symmetrical step low-pass KRC active filters according to the characteristics of differential amplifier circuit, and filtering has guaranteed the stability of pressure unit differential output voltage signal from the differential mode interference signal of presser sensor components and parts; Needn't use independent traffic filter, make circuit reduction, reduce cost.This differential amplifier circuit transmission characteristic and temperature characterisitic are linearity in addition, are convenient to temperature compensation and theoretical calculating, improve output accuracy and the temperature stability of pressure unit.
Description of drawings
Accompanying drawing 1 is electrical block diagram of the present invention.
Embodiment
1 couple of the present invention is described in further detail below in conjunction with Figure of description.
This circuit comprises constant current source 1, pressure resistance type SOI pressure-sensitive component 2, adjustable resistance Rp1～Rp4, double operational differential amplifier circuit.
The effect of adjustable resistance Rp1, Rp2, Rp3, Rp4 is as follows respectively: Rp1 is thermal sensitivity drift compensation debugging resistance, is used for compensation transmitter sensitivity temperature drift; Rp2 is thermal zero drift compensation debugging resistance, is used for the temperature drift amount of compensation transmitter zero-bit output; Rp3 is zero-bit output debugging resistance, is used for adjusting the output of transmitter zero-bit; Rp4 is full scale output debugging resistance, is used for adjusting the output of transmitter full scale.
The double operational differential amplifier circuit utilizes operational amplifier can substitute the characteristic of inductance, the design active filter, the differential mode interference signal of filtering input signal (being the output signal of pressure-sensitive component), resistance R 1, R2, R3 and capacitor C 1, C2 and operational amplifier N1 constitute a second order KRC wave filter;
Embodiment: get R1=R2=R5=R6=78.7k Ω, R3=R7=100k Ω, C1=C2=C3=C4=0.01 μ F, then the gain H of step low-pass KRC active filter
0LP=1, cutoff frequency ω
0=592.7Hz, quality factor q ≈ 0.707.
The present invention combines the temperature transmission characteristic of SOI pressure-sensing device and differential amplifier circuit, adopts four groups of minute adjustment resistance to finish the adjustment of pressure unit zero-bit output voltage, the adjustment of full scale output voltage, the temperature compensation of zero-bit output voltage and the compensation of sensitivity temperature respectively.And the characteristics according to differential amplifier circuit have designed two independent symmetrical step low-pass KRC active filters, and filtering has guaranteed the stability of pressure unit differential output voltage signal from the differential mode interference signal of presser sensor components and parts; Needn't use independent traffic filter, make circuit reduction.
Empirical tests, the pressure unit that utilizes circuit theory of the present invention to design, volume is little, and is in light weight, and the precision height can realize that the composition error in-55 ℃～175 ℃ total temperature scopes is not more than ± 0.5%FS.
Claims (2)
1. a high-precision pressure transmitter circuit is characterized in that: comprise constant current source (1), pressure resistance type SOI pressure-sensitive component (2), adjustable resistance Rp1～Rp4, double operational differential amplifier circuit; This steps on the quick electric bridge of four arm strengths to pressure resistance type SOI pressure-sensitive component (2) for favour, has 5 contacts, and wherein node d, e are positive power source terminal, and node b is negative power end, is connected with flowing into to hold with the outflow of constant current source respectively; Node a, c are respectively positive-negative output end, are connected with the positive and negative input end of differential amplifier circuit respectively; Adjustable resistance Rp3 one end links to each other with pressure resistance type SOI pressure-sensitive component (2) node d, and the other end links to each other with constant current source (1) outflow end; Adjustable resistance Rp2 is connected in parallel between pressure resistance type SOI pressure-sensitive component (2) positive power source terminal and the positive output end; Adjustable resistance Rp1 is connected in parallel between pressure resistance type SOI pressure-sensitive component (2) the positive-negative power end, links to each other by adjustable resistance Rp4 between two operational amplifier positive input terminals.
2. high-precision pressure transmitter circuit according to claim 1, it is characterized in that: the double operational differential amplifier circuit is made up of the step low-pass KRC active filter (3,4) of two independent symmetries, and the first step low-pass KRC active filter (3) comprises resistance R 1, R2, R3; Capacitor C 1, C2; Operational amplifier N1; One end of resistance R 1 is signal input part, and the other end is divided into two branch roads, and a branch road links to each other with operational amplifier N1 positive input terminal by R2, and another branch road links to each other with operational amplifier N1 negative input end by capacitor C 1; Resistance R 2 connects signal ground with operational amplifier N1 negative input end by capacitor C 2; Operational amplifier positive input terminal and output terminal are parallel with resistance R 3, the second step low-pass KRC active filters (4) and comprise resistance R 5, R6, R7; Capacitor C 3, C4; Operational amplifier N2; Its syndeton and parameter value and the first step low-pass KRC active filter (3) are identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101454030A CN103234689A (en) | 2013-04-24 | 2013-04-24 | Circuit of high-accuracy pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101454030A CN103234689A (en) | 2013-04-24 | 2013-04-24 | Circuit of high-accuracy pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103234689A true CN103234689A (en) | 2013-08-07 |
Family
ID=48882740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101454030A Pending CN103234689A (en) | 2013-04-24 | 2013-04-24 | Circuit of high-accuracy pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103234689A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716775A (en) * | 2014-12-03 | 2016-06-29 | 武汉航空仪表有限责任公司 | Interchangeability design circuit for pressure sensor of nonstandard signal output |
| CN105716749A (en) * | 2014-12-03 | 2016-06-29 | 武汉航空仪表有限责任公司 | Temperature compensation circuit for piezoresistive pressure sensor |
| CN106848450A (en) * | 2017-01-24 | 2017-06-13 | 上海空间电源研究所 | A kind of hydrogen-nickel battery internal hydrogen presses measuring circuit adjusting means |
| CN107063523A (en) * | 2016-02-11 | 2017-08-18 | 摩巴自动控制股份有限公司 | Electronic circuit, measuring cell, load detecting equipment and the vehicle including it |
| CN107655616A (en) * | 2017-09-13 | 2018-02-02 | 武汉中航传感技术有限责任公司 | The temperature compensation system and method for a kind of differential pressure pick-up |
| CN107928636A (en) * | 2017-12-12 | 2018-04-20 | 吉林大学 | A kind of pulse-taking instrument with temperature compensation function |
| CN107928641A (en) * | 2017-12-12 | 2018-04-20 | 吉林大学 | Pulse signal extraction element for pulse wave spectrum |
| CN107928638A (en) * | 2017-12-12 | 2018-04-20 | 吉林大学 | A kind of pulse signal extraction and transmission circuit |
| CN109104192A (en) * | 2018-07-27 | 2018-12-28 | 北京遥测技术研究所 | A kind of rail-to-rail ADC integrated circuit based on Data Fusion Structure |
| WO2023015473A1 (en) * | 2021-08-11 | 2023-02-16 | Goertek Inc. | Apparatus for force sensing and electronic device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715003A (en) * | 1984-07-27 | 1987-12-22 | Keller Ag Fur Druckmesstechnik | Method for temperature compensation and measuring circuit therefor |
| CN2788162Y (en) * | 2005-03-25 | 2006-06-14 | 上海智城分析仪器制造有限公司 | Differential pressure measuring circuit used to cleanse operating station |
-
2013
- 2013-04-24 CN CN2013101454030A patent/CN103234689A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715003A (en) * | 1984-07-27 | 1987-12-22 | Keller Ag Fur Druckmesstechnik | Method for temperature compensation and measuring circuit therefor |
| CN2788162Y (en) * | 2005-03-25 | 2006-06-14 | 上海智城分析仪器制造有限公司 | Differential pressure measuring circuit used to cleanse operating station |
Non-Patent Citations (2)
| Title |
|---|
| 刘新月: "压力传感器温度漂移补偿的电路设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》, no. 6, 15 December 2007 (2007-12-15), pages 11 - 15 * |
| 赛尔吉欧·佛朗哥: "《基于运算放大器和模拟集成电路的电路设计 （第3版）》", 31 May 2009, article "基于运算放大器和模拟集成电路的电路设计 （第3版）", pages: 114-121 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716775A (en) * | 2014-12-03 | 2016-06-29 | 武汉航空仪表有限责任公司 | Interchangeability design circuit for pressure sensor of nonstandard signal output |
| CN105716749A (en) * | 2014-12-03 | 2016-06-29 | 武汉航空仪表有限责任公司 | Temperature compensation circuit for piezoresistive pressure sensor |
| CN107063523A (en) * | 2016-02-11 | 2017-08-18 | 摩巴自动控制股份有限公司 | Electronic circuit, measuring cell, load detecting equipment and the vehicle including it |
| US10495529B2 (en) | 2016-02-11 | 2019-12-03 | Moba Mobile Automation Ag | Electrical full bridge strain gauge circuit, load cell, and load detection device for use in lifting platforms, trucks, and other machines |
| CN106848450A (en) * | 2017-01-24 | 2017-06-13 | 上海空间电源研究所 | A kind of hydrogen-nickel battery internal hydrogen presses measuring circuit adjusting means |
| CN107655616A (en) * | 2017-09-13 | 2018-02-02 | 武汉中航传感技术有限责任公司 | The temperature compensation system and method for a kind of differential pressure pick-up |
| CN107928636A (en) * | 2017-12-12 | 2018-04-20 | 吉林大学 | A kind of pulse-taking instrument with temperature compensation function |
| CN107928641A (en) * | 2017-12-12 | 2018-04-20 | 吉林大学 | Pulse signal extraction element for pulse wave spectrum |
| CN107928638A (en) * | 2017-12-12 | 2018-04-20 | 吉林大学 | A kind of pulse signal extraction and transmission circuit |
| CN109104192A (en) * | 2018-07-27 | 2018-12-28 | 北京遥测技术研究所 | A kind of rail-to-rail ADC integrated circuit based on Data Fusion Structure |
| WO2023015473A1 (en) * | 2021-08-11 | 2023-02-16 | Goertek Inc. | Apparatus for force sensing and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103234689A (en) | Circuit of high-accuracy pressure transmitter | |
| CN107884608B (en) | Electric energy meter control system and clock correction method | |
| CN104458121A (en) | Silicon pressure sensor temperature excursion compensating circuit and circuit establishing method | |
| CN104132674A (en) | Multi-signal output intelligent pressure transmitter | |
| CN103335588B (en) | A kind of measuring method of high-pressure closed vessel apparatus casing deformation | |
| CN114895231B (en) | High-end voltage differential sampling calibration system and method | |
| CN113624397A (en) | Silicon piezoresistive pressure sensor calibration compensation method | |
| CN108594020A (en) | The highly sensitive conductance of number display and high resistance measurement measuring circuit and method | |
| CN209961315U (en) | Dynamic and static railroad track scale weighing instrument | |
| CN201993195U (en) | Silicon capacitance pressure difference sensor capable of outputting multiple parameters | |
| CN103970173B (en) | Band-gap reference voltage circuit | |
| CN102769436A (en) | Inexpensive micro-power-consumption miniaturized signal conditioning module applicable to portable apparatuses | |
| CN102168994B (en) | Silicon capacitance differential pressure transducer with multi-parameter and compensation method of static pressure influence | |
| CN114047377A (en) | Inductance compensation transient step current standard device construction method | |
| CN212253981U (en) | Temperature test and compensation system of strain sensor | |
| CN205229184U (en) | Piezoelectric acceleration sensor signal conversion circuit of electric current source forcing | |
| CN207991561U (en) | A kind of device adjusted for resistance strain gage output | |
| CN114113747B (en) | Direct current transient step standard of TMR sensor | |
| CN110174528A (en) | Anti-interference quartz flexible accelerometer signal sampling system and compensation calculation method | |
| CN102739155B (en) | Frequency generator, correction circuit of frequency generator and multi-order compensation unit | |
| CN204988567U (en) | Monocrystalline silicon formula pressure transmitter | |
| CN113984138A (en) | Aviation fuel oil measurement system based on FFT spectral analysis | |
| CN103412194A (en) | Capacitance measuring and calculating circuit | |
| CN203337310U (en) | Atmospheric pressure measurement electric circuit | |
| CN205067014U (en) | Engine intake pressure sensor is complete, and device is debugged on line to warm area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130807 |