CN201269738Y - Intelligent converter of LVDT displacement transducer - Google Patents

Intelligent converter of LVDT displacement transducer Download PDF

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Publication number
CN201269738Y
CN201269738Y CNU2008200907199U CN200820090719U CN201269738Y CN 201269738 Y CN201269738 Y CN 201269738Y CN U2008200907199 U CNU2008200907199 U CN U2008200907199U CN 200820090719 U CN200820090719 U CN 200820090719U CN 201269738 Y CN201269738 Y CN 201269738Y
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CN
China
Prior art keywords
lvdt
chip microcomputer
signal
converter
displacement transducer
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Expired - Lifetime
Application number
CNU2008200907199U
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Chinese (zh)
Inventor
曲晓峰
林守玉
王春月
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Harbin Turbine Co Ltd
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Harbin Turbine Co Ltd
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Priority to CNU2008200907199U priority Critical patent/CN201269738Y/en
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Abstract

The utility model discloses an intelligent converter for an LVDT displacement sensor, which relates to the converter field and solves the problems of zero/full scale drift, unstability and tedious debugging caused by that the traditional displacement converter applies mechanical variable resister. The excitation signal input end and the detection signal output end of the LVDT displacement sensor are respectively connected with the excitation signal output end and the detection signal input end of an LVDT signal conditioning system; the output end of the LVDT signal conditioning system is connected with the voltage signal acquisition input end of a single chip microcomputer through an A/D conversion module and a first digital isolator; the memory input/output end of the single chip microcomputer is connected with the input/output end of an EPROM memory, the serial signal input/output end of the single chip microcomputer is connected with a serial communication port through a photoelectric isolator and the current control output end of the single chip microcomputer is sequentially output through a second digital isolator and a D/A conversion module. The intelligent converter is mainly applied to the intelligent conversion of the LVDT displacement sensor.

Description

The intelligent converter of LVDT displacement transducer
Technical field
The utility model relates to the converter field, and what be specifically related to is a kind of converter of displacement transducer.
Background technology
The converter of traditional bit displacement sensor all is to demarcate the zero degree of displacement transducer and the full scale of demarcating displacement transducer by the adjustable potentiometer of machinery.The shortcoming of the adjustable potentiometer maximum of machinery is exactly drift easily, whether the mechanical location of the adjustable potentiometer of machinery is operated in the optimum linear district of this equipment simultaneously, maximal accuracy and the commissioning staff's technical merit that whether can bring into play displacement transducer are closely related, so the stability of the converter of traditional bit displacement sensor and accuracy are not high.
In addition, the converter debugging of traditional bit displacement sensor is loaded down with trivial details, displacement transducer will be adjusted standard-sized sheet and complete shut-down two states at least, but the adjustable potentiometer of machinery is transferred in the optimum linear district of this equipment owing to will try one's best, and the full potentiometer of zero potentiometer and accent influences each other, so the debugging displacement transducer generally will be debugged repeatedly repeatedly, commissioning staff's workload is big, and the debugging effect also has much relations with commissioning staff's level.
The utility model content
The purpose of this utility model is for the zero degree that the adjustable potentiometer that solves traditional displacement trasducer use machinery brings/full scale drift and instability and debugs loaded down with trivial details problem.
The intelligent converter of LVDT displacement transducer, it comprises LVDT displacement transducer and intelligent converter, described intelligent converter is by LVDT signal condition system, the A/D modular converter, first digital isolator, watchdog circuit, eprom memory, single-chip microcomputer, photoisolator, serial communication interface, second digital isolator and D/A modular converter are formed, the pumping signal input end of LVDT displacement transducer is connected with the pumping signal output terminal of LVDT signal condition system, the detection signal output terminal of described LVDT displacement transducer is connected with the detection signal input end of LVDT signal condition system, the detection signal output terminal of described LVDT signal condition system connects the input end of analog signal of A/D modular converter, the digital signal output end of described A/D modular converter connects the input end of first digital isolator, the output terminal of described first digital isolator is connected with the collection voltage signal input end of single-chip microcomputer, the reset terminal RST of described single-chip microcomputer is connected with the output terminal of watchdog circuit, the clock signal output terminal of described single-chip microcomputer is connected with the clock signal input terminal of watchdog circuit, the storer I/O end of described single-chip microcomputer is connected with the I/O end of eprom memory, the serial signal I/O end of described single-chip microcomputer is connected with the I/O end of photoisolator, the I/O end of described photoisolator is connected with the I/O end of serial communication interface, the Current Control output terminal of described single-chip microcomputer is connected with the input end of second digital isolator, the output terminal of described second digital isolator is connected with the digital signal input end of D/A modular converter, the analog signal output output current signal of D/A modular converter.The electric current of the analog signal output output of D/A modular converter is 4 milliamperes to 20 milliamperes.
The calibration process of zero degree of the present utility model, full scale is: system sends pumping signal to the LVDT displacement transducer by the LVDT signal condition, the oscillating voltage conversion of signals that the LVDT displacement transducer that collects is exported becomes d. c. voltage signal to send to single-chip microcomputer simultaneously, zero degree or full scale calibration information that single-chip microcomputer sends by the serial communication interface receiving computer, it is zero degree or full scale that described d. c. voltage signal is demarcated.
Save the adjustable potentiometer that uses machinery in the converter that has displacement transducer now in the utility model, avoided because the zero degree that the adjustable potentiometer of machinery brings/full scale is drifted about and problem of unstable.The utility model adopts the zero degree/full scale of single-chip microcomputer Intelligent Calibration displacement trasducer, and described zero degree/full scale stored in the eprom memory, do not need manually to adjust repeatedly, reduce commissioning staff's workload significantly, zero degree/the full scale of being demarcated does not have the problem of drift yet, and debugging effect of the present utility model has also had significant raising than traditional debugging method.
In use of the present utility model, connect computing machine by serial communication interface.Computing machine can carry out real-time Communication for Power with single-chip microcomputer by serial communication interface, and single-chip microcomputer is according to zero degree in the eprom memory and full scale, and the voltage signal that the LVDT displacement transducer that collects is exported converts current signal output to.
The utility model has the advantages that: the zero degree of LVDT displacement transducer and full scale are demarcated convenient, and zero degree of being demarcated and full scale stability are high, no drift phenomenon.
Description of drawings
Fig. 1 is the electrical block diagram of the intelligent displacement trasducer of LVDT displacement transducer.
Embodiment
Embodiment one: this embodiment is described in conjunction with Fig. 1.The intelligent converter of the LVDT displacement transducer of present embodiment, it comprises LVDT displacement transducer 1 and intelligent converter 13, described intelligent converter 13 is by LVDT signal condition system 3, A/D modular converter 4, first digital isolator 5, watchdog circuit 6, eprom memory 7, single-chip microcomputer 8, photoisolator 9, serial communication interface 10, second digital isolator 11 and D/A modular converter 12 are formed, the pumping signal input end of LVDT displacement transducer 1 is connected with the pumping signal output terminal of LVDT signal condition system 3, the detection signal output terminal of described LVDT displacement transducer 1 is connected with the detection signal input end of LVDT signal condition system 3, the detection signal output terminal of described LVDT signal condition system 3 connects the input end of analog signal of A/D modular converter 4, the digital signal output end of described A/D modular converter 4 connects the input end of first digital isolator 5, the output terminal of described first digital isolator 5 is connected with the collection voltage signal input end of single-chip microcomputer 8, the reset terminal RST of described single-chip microcomputer 8 is connected with the output terminal of watchdog circuit 6, the clock signal output terminal of described single-chip microcomputer 8 is connected with the clock signal input terminal of watchdog circuit 6, the storer I/O end of described single-chip microcomputer 8 is connected with the I/O end of eprom memory 7, the serial signal I/O end of described single-chip microcomputer 8 is connected with the I/O end of photoisolator 9, the I/O end of described photoisolator 9 is connected with the I/O end of serial communication interface 10, the Current Control output terminal of described single-chip microcomputer 8 is connected with the input end of second digital isolator 11, the output terminal of described second digital isolator 11 is connected with the digital signal input end of D/A modular converter 12, the analog signal output output current signal of D/A modular converter.
The model of the LVDT signal condition system 3 in the present embodiment is AD698, and the model of single-chip microcomputer 8 is 89v51, and the model of first digital isolator 5 is ADUM1401, and the model of second digital isolator 11 is ADUM1402, and the model of photoisolator 9 is IL485.
The zero degree of present embodiment, the calibration process of full scale are: send pumping signal by LVDT signal condition system 3 to LVDT displacement transducer 1, the oscillating voltage conversion of signals that the LVDT displacement transducer 1 that collects is exported becomes d. c. voltage signal to send to single-chip microcomputer 8 simultaneously, and single-chip microcomputer 8 is demarcated described d. c. voltage signal and is zero degree or full scale.
Save the adjustable potentiometer that uses machinery in the converter that has displacement transducer now in the present embodiment, avoided because the zero degree that the adjustable potentiometer of machinery brings/full scale is drifted about and problem of unstable.The utility model adopts the zero degree/full scale of single-chip microcomputer 8 Intelligent Calibration displacement trasducers, and described zero degree/full scale stored in the eprom memory 7, do not need manually to adjust repeatedly, reduce commissioning staff's workload significantly, zero degree/the full scale of being demarcated does not have the problem of drift yet, and debugging effect of the present utility model has also had significant raising than traditional debugging method.
Present embodiment in use, single-chip microcomputer 8 is according to zero degree in the eprom memory 7 and full scale, converts the voltage signal of LVDT displacement transducer 1 output that collects to current signal output.
Embodiment two: the difference of this embodiment and embodiment one is: the current signal of the analog signal output output of D/A modular converter 12 is between 4 milliamperes to 20 milliamperes.
Embodiment three: this embodiment with the difference of embodiment one is: it also comprises computing machine 2, and described computing machine 2 is connected with serial communication interface 10.
The zero degree of present embodiment, the calibration process of full scale are: send pumping signal by LVDT signal condition system 3 to LVDT displacement transducer 1, the oscillating voltage conversion of signals that the LVDT displacement transducer 1 that collects is exported becomes d. c. voltage signal to send to single-chip microcomputer 8 simultaneously, zero degree or full scale calibration information that single-chip microcomputer 8 sends by serial communication interface 10 receiving computers 2, it is zero degree or full scale that described d. c. voltage signal is demarcated.
Present embodiment connects computing machine 2 by serial communication interface 10 in use.Computing machine 2 can carry out real-time Communication for Power with single-chip microcomputer 8 by serial communication interface 10, can revise zero degree or full scale at any time according to the actual measurement situation, can also monitor the measurement result of the LVDT sensor 1 of single-chip microcomputer 8 acquisitions.

Claims (3)

1, the intelligent converter of LVDT displacement transducer, it comprises that LVDT displacement transducer (1) is characterized in that: it also comprises intelligent converter (13), described intelligent converter (13) is by LVDT signal condition system (3), A/D modular converter (4), first digital isolator (5), watchdog circuit (6), eprom memory (7), single-chip microcomputer (8), photoisolator (9), serial communication interface (10), second digital isolator (11) and D/A modular converter (12) are formed, the pumping signal input end of LVDT displacement transducer (1) is connected with the pumping signal output terminal of LVDT signal condition system (3), the detection signal output terminal of described LVDT displacement transducer (1) is connected with the detection signal input end of LVDT signal condition system (3), the detection signal output terminal of described LVDT signal condition system (3) connects the input end of analog signal of A/D modular converter (4), the digital signal output end of described A/D modular converter (4) connects the input end of first digital isolator (5), the output terminal of described first digital isolator (5) is connected with the collection voltage signal input end of single-chip microcomputer (8), the reset terminal RST of described single-chip microcomputer (8) is connected with the output terminal of watchdog circuit (6), the clock signal output terminal of described single-chip microcomputer (8) is connected with the clock signal input terminal of watchdog circuit (6), the storer I/O end of described single-chip microcomputer (8) is connected with the I/O end of eprom memory (7), the serial signal I/O end of described single-chip microcomputer (8) is connected with the I/O end of photoisolator (9), the I/O end of described photoisolator (9) is connected with the I/O end of serial communication interface (10), the Current Control output terminal of described single-chip microcomputer (8) is connected with the input end of second digital isolator (11), the output terminal of described second digital isolator (11) is connected with the digital signal input end of D/A modular converter (12), the analog signal output output current signal of D/A modular converter (12).
2, the intelligent converter of LVDT displacement transducer according to claim 1, the current signal of analog signal output output that it is characterized in that D/A modular converter (12) is between 4 milliamperes to 20 milliamperes.
3, the intelligent converter of LVDT displacement transducer according to claim 1 is characterized in that it also comprises computing machine (2), and described computing machine (2) is connected with serial communication interface (10).
CNU2008200907199U 2008-08-22 2008-08-22 Intelligent converter of LVDT displacement transducer Expired - Lifetime CN201269738Y (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101915635A (en) * 2010-07-21 2010-12-15 哈尔滨海泰克水系统科技有限责任公司 Pressure data collector and collecting method thereof
CN102255275A (en) * 2011-08-01 2011-11-23 常熟开关制造有限公司(原常熟开关厂) DC low voltage circuit breaker protection device
CN102589410A (en) * 2012-03-15 2012-07-18 李建国 Phase sensitive detection type linear variable differential transformer (LVDT) displacement sensor for measuring pile foundation micro strain
CN103116054A (en) * 2013-01-25 2013-05-22 天津市松正电动汽车技术股份有限公司 Isolation voltage acquisition circuit
CN103528492A (en) * 2013-11-05 2014-01-22 无锡市迈日机器制造有限公司 Signal converter of high-measurement-range submicron-level high-precision LVDT (linear variable differential transformer) displacement sensor
CN103644833A (en) * 2013-11-28 2014-03-19 无锡市迈日机器制造有限公司 Network version high-performance electronic column with mobile storage device
CN105953717A (en) * 2016-06-30 2016-09-21 深圳市信为科技发展有限公司 Pneumatic type displacement sensor structure
CN112484757A (en) * 2020-11-17 2021-03-12 西安热工研究院有限公司 Automatic calibration method for valve position sensor of servo card in digital electro-hydraulic control system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101915635A (en) * 2010-07-21 2010-12-15 哈尔滨海泰克水系统科技有限责任公司 Pressure data collector and collecting method thereof
CN102255275A (en) * 2011-08-01 2011-11-23 常熟开关制造有限公司(原常熟开关厂) DC low voltage circuit breaker protection device
CN102589410A (en) * 2012-03-15 2012-07-18 李建国 Phase sensitive detection type linear variable differential transformer (LVDT) displacement sensor for measuring pile foundation micro strain
CN103116054A (en) * 2013-01-25 2013-05-22 天津市松正电动汽车技术股份有限公司 Isolation voltage acquisition circuit
CN103528492A (en) * 2013-11-05 2014-01-22 无锡市迈日机器制造有限公司 Signal converter of high-measurement-range submicron-level high-precision LVDT (linear variable differential transformer) displacement sensor
CN103528492B (en) * 2013-11-05 2016-07-06 无锡市迈日机器制造有限公司 Signal translating system based on wide range submicron order high accuracy LVDT displacement transducer
CN103644833A (en) * 2013-11-28 2014-03-19 无锡市迈日机器制造有限公司 Network version high-performance electronic column with mobile storage device
CN103644833B (en) * 2013-11-28 2016-06-01 无锡市迈日机器制造有限公司 The high-performance electronic post of network edition Tape movement storer
CN105953717A (en) * 2016-06-30 2016-09-21 深圳市信为科技发展有限公司 Pneumatic type displacement sensor structure
CN105953717B (en) * 2016-06-30 2019-02-01 深圳市信为科技发展有限公司 Pneumatic type displacement sensor structure
CN112484757A (en) * 2020-11-17 2021-03-12 西安热工研究院有限公司 Automatic calibration method for valve position sensor of servo card in digital electro-hydraulic control system

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Granted publication date: 20090708

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