CN202350952U - Thermal resistance calibrating and measuring device - Google Patents

Thermal resistance calibrating and measuring device Download PDF

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Publication number
CN202350952U
CN202350952U CN2011204543598U CN201120454359U CN202350952U CN 202350952 U CN202350952 U CN 202350952U CN 2011204543598 U CN2011204543598 U CN 2011204543598U CN 201120454359 U CN201120454359 U CN 201120454359U CN 202350952 U CN202350952 U CN 202350952U
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CN
China
Prior art keywords
thermal resistance
module
characterized
calibration measurement
resistance
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CN2011204543598U
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Chinese (zh)
Inventor
李斌
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深圳市业海科技发展有限公司
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Abstract

The utility model provides a thermal resistance calibrating and measuring device, which includes a constant-current source used for providing a current excitation signal, a thermal resistance transducer connected with the constant-current source, and an analog-to-digital conversion module, a central processing module, an digital-to-analog conversion module and a signal proportional amplification module that are sequentially connected with the thermal resistance transducer, a man-machine interaction module and a display module both connected with the central processing module, and a power source connected with all the thermal resistance transducer, the analog-to-digital conversion module and the man-machine interaction module. The thermal resistance calibrating and measuring device can obtain high-precision output resistance, has excellent heat stability, and furthermore, can simulate and test the ohm properties of the thermal resistance, includes two working modes, namely the measurement mode and the simulation output mode, requires no additional device, and lowers the work amount and cost of the measurement.

Description

A kind of thermal resistance calibration measurement device

Technical field

The utility model relates to a kind of calibration measurement device, relates in particular to a kind of thermal resistance calibration measurement device.

Background technology

At present, traditional thermal resistance measuring method is to adopt the measuring principle of bridge-type to improve measuring accuracy, but the resistance range that bridge-type is measured is less; Be difficult to accomplish high precision and produce debugging inconvenience; And when needing base measuring temperature, also need the extraneous extra resistance source that provides, need extra device; Cause the increase of surveying work amount and cost, this is a design challenges; In addition, in the existing design, make resistance box to switch exportable required resistance by relay into, make that its volume is big and be connected in series relay to have contacted resistance, poor heat stability can't obtain accurate resistance value and higher resolution.

Summary of the invention

The utility model technical matters to be solved is that a kind of Heat stability is good need be provided, and can obtain the thermal resistance calibration measurement device of high-precision output resistance.

To this, the utility model provides a kind of thermal resistance calibration measurement device, comprising:

Be used to provide the constant current source of current excitation signal;

The thermal resistance sensor that is connected with said constant current source;

The analog-to-digital conversion module, central processing module, D/A converter module and the signal proportion amplification module that are connected successively with said thermal resistance sensor;

The human-computer interaction module and the display module that are connected with said central processing module;

And, the power supply that is connected with said thermal resistance sensor, analog-to-digital conversion module and human-computer interaction module.

Wherein, said constant current source is used to the current excitation signal that provides fixing, adopts constant current source that the internal motivation signal is provided, and does not then need other discrete components; The thermal resistance that said thermal resistance calibration measurement device adopts is RTD; Can adopt RTD; The utility model adopts amplifier to constitute one-port network, obtains the ratio of input voltage and electric current through human-computer interaction module and central processing module, wherein; Central processing module is a nucleus module, is used to realize data processing and control; The utility model comprises two kinds of mode of operations, promptly measurement pattern with the simulation output mode, under the measurement pattern; Said constant current source provides the internal current excitation, and numerical value is for fixing current excitation, when being external to thermal resistance sensor to be tested; This exciting current constitutes the loop, on thermal resistance, will produce a pressure drop so, and this voltage is directly proportional with the resistance variations of thermal resistance sensor; This voltage signal directly is sent to analog-to-digital conversion module, because the constant excitation electric current that the constant current source that adopts provides is less, can not cause the heating of resistive sensor; Guaranteed the measuring accuracy of thermal resistance, Heat stability is good.

Mostly the application of the utility model is on the loop component of industrial process that on-the-spot environment for use is comparatively complicated, disturbs mainly to act in the A/D measurement; Therefore, satisfy certain standard in the design demand of hardware, such as having certain anti-electromagnetic interference (EMI); The described analog-to-digital conversion module of the utility model adopts the A/D chip, can adopt the A/D chip realization of high precision small-signal at a slow speed to measure, simultaneously; Add linear filtering, can more effectively suppress the interference of noise signal.

The course of work of said simulation output mode and the course of work of measurement pattern are opposite; Under the simulation output mode; The utility model can equivalence be a variable resistor; At this moment external unit can provide a test and excitation signal to be input to the utility model inside, and according to the difference of the resistive testing apparatus in the external world, the size of pumping signal is also different; Can on the basis of software and hardware combining, realize the function of digital precision combined resistance, said D/A converter module adopt the D/A chip according to the size of external testing signal with treat that the resistance of output resistance calculates and export signal.

Compared with prior art, its advantage is that the utility model can obtain high-precision output resistance; Heat stability is good; On this basis, can also simulate and test the ohm property of thermal resistance, comprise two kinds of mode of operations of measurement pattern and simulation output mode; Need not extra device, reduced workload and the cost measured.

Preferably, also comprise the digital impedance synthesis module that is used for the heat outputting resistance value.

Wherein, Said digital impedance synthesis module adopts linear variable impedance synthesizer, is used under the simulation output mode, and central processing module is according to the temperature value of setting; Calculate the corresponding resistance value of Current Temperatures thermal resistance, export this resistance through this digital impedance synthesis module to the outside then.

The utility model further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good; Obtain high-precision output resistance, Heat stability is good, on this basis; Also comprise the digital impedance synthesis module that is used for the heat outputting resistance value, be convenient to further accurately realize simulation and test thermal resistance.

Preferably, also comprise the temperature variator that is used for base measuring temperature.

Wherein, under measurement pattern, the utility model detects the outside thermal resistance or the signal of analog machine; After the A/D conversion of process analog-to-digital conversion module and the calculating of central processing module, draw the resistance value of measurement, calculate the pairing temperature of current resistance value according to the temperature of RTD and the functional relation of its resistance again; Under the simulation output mode, central processing module calculates the corresponding resistance value of RTD of Current Temperatures according to the temperature value of setting; Fail this resistance through the digital impedance synthesis module to the outside then; All working process, resistance data are intermediate variables, and temperature is final result; So temperature data and resistance data can be simultaneously displayed on the display module, be convenient to the accuracy of signal transmission that the client sees transmitter and the secondary instrument of the front end sensors that detects industrial loop and rear end.

The utility model further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good obtains high-precision output resistance, Heat stability is good; On this basis, also comprise the temperature variator that is used for base measuring temperature, can be simultaneously displayed on temperature data and resistance data on the display module; Make things convenient for the client to observe the corresponding relation of temperature amount and resistance value at any time, especially in factory's maintenance, when concentrating the performance of test thermal resistance sensor; Can fast detecting in the resistance value of uniform temp environment lower sensor, the convenient use.

Preferably, said central processing module adopts microcontroller.

Wherein, Said central processing module adopts microcontroller; And be connected with said analog-to-digital conversion module, D/A converter module, human-computer interaction module and display module, promptly adopted the course of work of microcontroller (MCU) control survey pattern with the simulation output mode.

The utility model further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good; Obtain high-precision output resistance, Heat stability is good, on this basis; Said central processing module adopts microcontroller, further promotes the control of measurement pattern with the simulation output mode course of work.

Preferably, said display module adopts the LCD LCD.

The utility model further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good obtains high-precision output resistance, Heat stability is good; On this basis; Said display module adopts the LCD LCD, is convenient to temperature data and/or resistance data are come out through the LCD liquid crystal display displays, and is easy to use, directly perceived.

Preferably, said human-computer interaction module comprises the temperature setup unit.

The utility model further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good obtains high-precision output resistance, Heat stability is good; On this basis, adopt said temperature setup unit to carry out manual temperature and set, be convenient to change its temperature; And can be informed in the resistance value of this temperature environment lower sensor simultaneously, further promote the convenience of using again.

Preferably, said signal proportion amplification module also comprises the integral unit that forms the REF feedback with D/A converter module.

Wherein, said signal proportion amplification module also comprises the integral unit that forms the REF feedback with D/A converter module, said D/A converter module output simulating signal to ratio amplification module; Obtain treating output resistance, through forming the REF feedback with said D/A converter module after the integral unit, said integral unit adopts the I/V integration; Being about to the current signal integration is voltage signal; Realize dynamic calibration, compared with prior art, can more accurately realize simulating the course of work of output mode.

Preferably, the exciting current of said constant current source is 200 microamperes.

The utility model further adopts above-mentioned technical characterictic; Its advantage is; The exciting current of said constant current source is 200 microamperes, can not cause the heating of sensor, has guaranteed the measuring accuracy of thermal resistance; Also avoid simultaneously the drawback of one-sided pursuit measuring accuracy, can guarantee measuring accuracy and low cost simultaneously.

Preferably, also comprise communication module.

The utility model further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good obtains high-precision output resistance, Heat stability is good; Can also temperature data and resistance data be simultaneously displayed on the display module, in addition, said communication module adopts host computer to realize communication; That can realize calibrating is intelligent and networked; Be convenient to the calibration and the measurement of thermal resistance, make things convenient for the report of online printing calibration measurement, be convenient to actual application and operation.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is the ratio amplification module structural representation of the another kind of embodiment of the utility model.

Embodiment

Below in conjunction with accompanying drawing, the more excellent embodiment of the utility model is done further detailed description:

Embodiment 1:

As shown in Figure 1, this example provides a kind of thermal resistance calibration measurement device, comprising:

Be used to provide the constant current source of current excitation signal;

The thermal resistance sensor that is connected with said constant current source;

The analog-to-digital conversion module, central processing module, D/A converter module and the signal proportion amplification module that are connected successively with said thermal resistance sensor;

The human-computer interaction module and the display module that are connected with said central processing module;

And, the power supply that is connected with said thermal resistance sensor, analog-to-digital conversion module and human-computer interaction module.

Wherein, said constant current source is used to the current excitation signal that provides fixing, adopts constant current source that the internal motivation signal is provided, and does not then need other discrete components; The thermal resistance that said thermal resistance calibration measurement device adopts is RTD; Can adopt RTD; This example adopts amplifier to constitute one-port network, obtains the ratio of input voltage and electric current through human-computer interaction module and central processing module, wherein; Central processing module is a nucleus module, is used to realize data processing and control; Said signal proportion amplification module directly links to each other with external unit, and this example comprises two kinds of mode of operations, i.e. measurement pattern and simulation output mode; Under the measurement pattern, said constant current source provides the internal current excitation, and numerical value is fixing current excitation; When being external to thermal resistance sensor to be tested, this exciting current constitutes the loop, on thermal resistance, will produce a pressure drop so; This voltage is directly proportional with the resistance variations of thermal resistance sensor, and this voltage signal directly is sent to analog-to-digital conversion module, because the constant excitation electric current that the constant current source that adopts provides is less; Can not cause the heating of resistive sensor, guarantee the measuring accuracy of thermal resistance, Heat stability is good.

Mostly this routine application is on the loop component of industrial process that on-the-spot environment for use is comparatively complicated, disturbs mainly to act in the A/D measurement; Therefore, satisfy certain standard in the design demand of hardware, such as having certain anti-electromagnetic interference (EMI); This routine described analog-to-digital conversion module adopts the A/D chip, can adopt the A/D chip realization of high precision small-signal at a slow speed to measure, simultaneously; Add linear filtering, can more effectively suppress the interference of noise signal.

The course of work of said simulation output mode and the course of work of measurement pattern are opposite; Under the simulation output mode; This example can equivalence be a variable resistor; At this moment external unit can provide a test and excitation signal to be input to this example inside, and according to the difference of the resistive testing apparatus in the external world, the size of pumping signal is also different; Can on the basis of software and hardware combining, realize the function of digital precision combined resistance, said D/A converter module adopt the D/A chip according to the size of external testing signal with treat that the resistance of output resistance calculates and export signal.

Compared with prior art, its advantage is that this example can obtain high-precision output resistance; Heat stability is good; On this basis, can also simulate and test the ohm property of thermal resistance, comprise two kinds of mode of operations of measurement pattern and simulation output mode; Need not extra device, reduced workload and the cost measured.

Embodiment 2:

Different with embodiment 1 is that this example also comprises the digital impedance synthesis module that is used for the heat outputting resistance value.

Wherein, Said digital impedance synthesis module adopts linear variable impedance synthesizer, is used under the simulation output mode, and central processing module is according to the temperature value of setting; Calculate the corresponding resistance value of Current Temperatures thermal resistance, export this resistance through this digital impedance synthesis module to the outside then.

This example further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good; Obtain high-precision output resistance, Heat stability is good, on this basis; Also comprise the digital impedance synthesis module that is used for the heat outputting resistance value, be convenient to further accurately realize simulation and test thermal resistance.

Embodiment 3:

Different with embodiment 2 is that this example also comprises the temperature variator that is used for base measuring temperature.

Wherein, under measurement pattern, this example detects the outside thermal resistance or the signal of analog machine; After the A/D conversion of process analog-to-digital conversion module and the calculating of central processing module, draw the resistance value of measurement, calculate the pairing temperature of current resistance value according to the temperature of RTD and the functional relation of its resistance again; Under the simulation output mode, central processing module calculates the corresponding resistance value of RTD of Current Temperatures according to the temperature value of setting; Fail this resistance through the digital impedance synthesis module to the outside then; All working process, resistance data are intermediate variables, and temperature is final result; So temperature data and resistance data can be simultaneously displayed on the display module, be convenient to the accuracy of signal transmission that the client sees transmitter and the secondary instrument of the front end sensors that detects industrial loop and rear end.

This example further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good obtains high-precision output resistance, Heat stability is good; On this basis, also comprise the temperature variator that is used for base measuring temperature, can be simultaneously displayed on temperature data and resistance data on the display module; Make things convenient for the client to observe the corresponding relation of temperature amount and resistance value at any time, especially in factory's maintenance, when concentrating the performance of test thermal resistance sensor; Can fast detecting in the resistance value of uniform temp environment lower sensor, the convenient use.

Embodiment 4:

Different with embodiment 1 is that this routine said central processing module adopts microcontroller.

Wherein, Said central processing module adopts microcontroller; And be connected with said analog-to-digital conversion module, D/A converter module, human-computer interaction module and display module, promptly adopted the course of work of microcontroller (MCU) control survey pattern with the simulation output mode.

This example further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good; Obtain high-precision output resistance, Heat stability is good, on this basis; Said central processing module adopts microcontroller, further promotes the control of measurement pattern with the simulation output mode course of work.

Embodiment 5:

Different with embodiment 4 is that this routine said display module adopts LCD LCD.

This example further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good obtains high-precision output resistance, Heat stability is good; On this basis; Said display module adopts the LCD LCD, is convenient to temperature data and/or resistance data are come out through the LCD liquid crystal display displays, and is easy to use, directly perceived.

Embodiment 6:

Different with embodiment 1 is that this routine said human-computer interaction module comprises the temperature setup unit.

This example further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure; Heat stability is good obtains high-precision output resistance, Heat stability is good; On this basis, adopt said temperature setup unit to carry out manual temperature and set, be convenient to change its temperature; And can be informed in the resistance value of this temperature environment lower sensor simultaneously, further promote the convenience of using again.

Embodiment 7:

As shown in Figure 2, different with embodiment 6 is that this routine said signal proportion amplification module also comprises the integral unit that forms the REF feedback with D/A converter module.

Wherein, said signal proportion amplification module also comprises the integral unit that forms the REF feedback with D/A converter module, said D/A converter module output simulating signal to ratio amplification module; Obtain treating output resistance, through forming the REF feedback with said D/A converter module after the integral unit, said integral unit adopts the I/V integration; Being about to the current signal integration is voltage signal; Realize dynamic calibration, compared with prior art, can more accurately realize simulating the course of work of output mode.

Embodiment 8:

Different with embodiment 7 is that the exciting current of this routine said constant current source is 200 microamperes.

This example further adopts above-mentioned technical characterictic, and its advantage is that the exciting current of said constant current source is 200 microamperes; Can not cause the heating of sensor; Guarantee the measuring accuracy of thermal resistance, also avoided the drawback of one-sided pursuit measuring accuracy simultaneously, can guarantee measuring accuracy and low cost simultaneously.

Embodiment 9:

Different with embodiment 8 is that this example also comprises communication module.

This example further adopts above-mentioned technical characterictic, and its advantage is, the precision that can improve the thermal resistance calibration and measure, Heat stability is good; Obtain high-precision output resistance, Heat stability is good can also be simultaneously displayed on temperature data and resistance data on the display module; In addition, said communication module adopts host computer to realize communication, and that can realize calibrating is intelligent and networked; Be convenient to the calibration and the measurement of thermal resistance, make things convenient for the report of online printing calibration measurement, be convenient to actual application and operation.

The embodiment of the above is the preferred embodiments of the utility model; It is not the practical implementation scope that limits the utility model with this; The scope of the utility model comprises and is not limited to this embodiment that all shapes according to the utility model, the equivalence that structure is done change all in the protection domain of the utility model.

Claims (10)

1. a thermal resistance calibration measurement device is characterized in that, comprising:
Be used to provide the constant current source of current excitation signal;
The thermal resistance sensor that is connected with said constant current source;
The analog-to-digital conversion module, central processing module, D/A converter module and the signal proportion amplification module that are connected successively with said thermal resistance sensor;
The human-computer interaction module and the display module that are connected with said central processing module;
And, the power supply that is connected with said thermal resistance sensor, analog-to-digital conversion module and human-computer interaction module.
2. thermal resistance calibration measurement device according to claim 1 is characterized in that, also comprises the digital impedance synthesis module that is used for the heat outputting resistance value.
3. thermal resistance calibration measurement device according to claim 2 is characterized in that, also comprises the temperature variator that is used for base measuring temperature.
4. according to claim 1,2 or 3 described thermal resistance calibration measurement devices, it is characterized in that said central processing module adopts microcontroller.
5. thermal resistance calibration measurement device according to claim 4 is characterized in that, said display module adopts the LCD LCD.
6. according to claim 1,2 or 3 described thermal resistance calibration measurement devices, it is characterized in that said human-computer interaction module comprises the temperature setup unit.
7. thermal resistance calibration measurement device according to claim 6 is characterized in that, said signal proportion amplification module also comprises the integral unit that forms the REF feedback with D/A converter module.
8. thermal resistance calibration measurement device according to claim 7 is characterized in that the exciting current of said constant current source is 200 microamperes.
9. according to 1,2 or 3 described thermal resistance calibration measurement devices, it is characterized in that, also comprise communication module.
10. according to 8 described thermal resistance calibration measurement devices, it is characterized in that, also comprise communication module.
CN2011204543598U 2011-11-16 2011-11-16 Thermal resistance calibrating and measuring device CN202350952U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103424157A (en) * 2013-08-27 2013-12-04 浙江水利水电学院 Combined resistance type sensor
CN103873022A (en) * 2012-12-14 2014-06-18 中国航空工业集团公司航空动力控制系统研究所 Passive thermal resistor sensor signal simulation circuit
CN104155025A (en) * 2014-07-24 2014-11-19 北京航天发射技术研究所 Temperature detection system and temperature transmitter for low-temperature liquid medium
CN104614593A (en) * 2014-12-26 2015-05-13 同济大学 Self-calibration based high-precision intelligent instrument system and application method thereof
CN104697669A (en) * 2015-02-16 2015-06-10 北京新能源汽车股份有限公司 Method and device for calibrating temperature collection channel in battery management system
CN105320021A (en) * 2014-07-30 2016-02-10 北京国电智深控制技术有限公司 Analog thermal resistance output device
CN106227061A (en) * 2016-07-29 2016-12-14 江西洪都航空工业集团有限责任公司 A kind of stagnation temperature analog based on mirror current source
CN107255534A (en) * 2017-07-12 2017-10-17 天津津航技术物理研究所 A kind of error measurement method of Thermistor Temperature Measurement instrument

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103873022A (en) * 2012-12-14 2014-06-18 中国航空工业集团公司航空动力控制系统研究所 Passive thermal resistor sensor signal simulation circuit
CN103424157B (en) * 2013-08-27 2016-04-06 浙江水利水电学院 Combined resistance formula sensor
CN103424157A (en) * 2013-08-27 2013-12-04 浙江水利水电学院 Combined resistance type sensor
CN104155025A (en) * 2014-07-24 2014-11-19 北京航天发射技术研究所 Temperature detection system and temperature transmitter for low-temperature liquid medium
CN104155025B (en) * 2014-07-24 2016-08-17 北京航天发射技术研究所 The system for detecting temperature of Low Temperature Liquid medium and temperature transmitter
CN105320021A (en) * 2014-07-30 2016-02-10 北京国电智深控制技术有限公司 Analog thermal resistance output device
CN104614593A (en) * 2014-12-26 2015-05-13 同济大学 Self-calibration based high-precision intelligent instrument system and application method thereof
CN104614593B (en) * 2014-12-26 2017-12-15 同济大学 One kind is based on self-alignment high-precision intelligent instrument system and its application process
CN104697669A (en) * 2015-02-16 2015-06-10 北京新能源汽车股份有限公司 Method and device for calibrating temperature collection channel in battery management system
CN104697669B (en) * 2015-02-16 2018-04-03 北京新能源汽车股份有限公司 To the method and apparatus that temperature acquisition channel is calibrated in battery management system
CN106227061A (en) * 2016-07-29 2016-12-14 江西洪都航空工业集团有限责任公司 A kind of stagnation temperature analog based on mirror current source
CN107255534A (en) * 2017-07-12 2017-10-17 天津津航技术物理研究所 A kind of error measurement method of Thermistor Temperature Measurement instrument
CN107255534B (en) * 2017-07-12 2019-04-19 天津津航技术物理研究所 A kind of error measurement method of Thermistor Temperature Measurement instrument

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Granted publication date: 20120725

Termination date: 20151116