CN107687905A - A kind of platinum resistance temperature harvester - Google Patents
A kind of platinum resistance temperature harvester Download PDFInfo
- Publication number
- CN107687905A CN107687905A CN201610634355.5A CN201610634355A CN107687905A CN 107687905 A CN107687905 A CN 107687905A CN 201610634355 A CN201610634355 A CN 201610634355A CN 107687905 A CN107687905 A CN 107687905A
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- Prior art keywords
- switch
- mobile terminal
- rtd
- operation switch
- fixing end
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2219/00—Thermometers with dedicated analog to digital converters
Abstract
The invention provides a kind of platinum resistance temperature harvester, including：Constant-current source, for providing constant DC signal；Self diagnosis and demarcating module, it is connected respectively with the constant-current source and RTD to be measured, the direct current signal and RTD provided based on the constant-current source carries out error calibration and fault diagnosis；Voltage acquisition module, it is connected with the self diagnosis and demarcating module, by the voltage signal of the self diagnosis and demarcating module control collection RTD to realize temperature acquisition.The present invention can realize that the fault self-diagnosis when conformity error and line disconnection failure of acquisition system under calculating different temperatures environment promptly and accurately positions.
Description
Technical field
The invention belongs to detection technique field, specifically, more particularly to a kind of platinum resistance temperature harvester.
Background technology
Temperature is an important measurement parameter during industrial production and use, and temperature survey and the accuracy demarcated are straight
Connect and affect production and product running quality.With the development of e measurement technology, the requirement to temperature measurement accuracy is also more next
It is higher, for example, locomotive industry cooling-water temperature sensor error requirements just within 1 DEG C.
Because operation principle is simple, design circuit is simple, platinum resistance temperature acquisition system is widely used in medical treatment, motor, work
The fields such as industry.But the platinum resistance temperature acquisition system (non-integrated circuit chip) of main flow does not possess electric circuit inspection function at present,
Especially under complex industrial environment, connection is unstable caused by vibrations, the failure generally existing brought.In addition, in master
, it is necessary to which external swept resistance or precision resister are demarcated, such as collecting part and mark in the temperature error scaling scheme of stream
Periodical repair orders algorithm portion separately, and outer meeting resistance will be faced to re-scale by being individually replaced capture card every time.
Therefore, for platinum resistance temperature acquisition system, error how is further eliminated to improve the collection of system essence
Degree, and scene wiring how to ensure it is reliable and stable, promptly and accurately failure can be judged, be all to need the weight that solves
Want problem.
The content of the invention
To solve problem above, the invention provides a kind of platinum resistance temperature harvester, can be achieved to calculate different temperatures
Fault self-diagnosis positioning under environment when the conformity error and line disconnection failure of acquisition system promptly and accurately.
According to one embodiment of present invention, there is provided a kind of platinum resistance temperature harvester, including：
Constant-current source, for providing constant DC signal；
Self diagnosis and demarcating module, it is connected with the constant-current source and RTD to be measured, is provided based on the constant-current source respectively
Direct current signal and RTD carry out error calibration and fault diagnosis；
Voltage acquisition module, it is connected with the self diagnosis and demarcating module, is adopted by the self diagnosis and demarcating module control
Collect the voltage signal of RTD to realize temperature acquisition.
According to one embodiment of present invention, the self diagnosis and demarcating module include：
First either-or switch, its fixing end are connected with the constant-current source, and the first mobile terminal is connected with RTD one end, the
Two mobile terminals are connected with high-precision calibrating resistance one end；
Second either-or switch, its fixing end are connected with the input port of voltage acquisition module one, the first mobile terminal with
The first mobile terminal connection of first either-or switch, the second mobile terminal are connected with the second mobile terminal of the first either-or switch, the
One mobile terminal is connected with the second mobile terminal by the first Operation switch；
3rd either-or switch, its fixing end are connected with another input port of the voltage acquisition module, the first mobile terminal
It is connected with the high-precision calibrating resistance other end, the second mobile terminal is connected with the RTD other end, the first mobile terminal and the second movement
End is connected by the second Operation switch；
4th either-or switch, its fixing end are connected to ground, and the first mobile terminal is connected with the high-precision calibrating resistance other end,
Second mobile terminal is connected with the RTD other end.
According to one embodiment of present invention, described device is constructed to be permeable to entering trip temperature to RTD using four-wire system
Cause during collection：
Disconnect the first Operation switch and the second Operation switch, the first either-or switch and the second either-or switch respective
One mobile terminal connects with corresponding fixing end, the 3rd either-or switch and respective second mobile terminal of the 4th either-or switch and right
The fixing end connection answered.
According to one embodiment of present invention, described device is constructed to be permeable to entering trip temperature to RTD using three-wire system
Cause during collection：
The first Operation switch is closed, disconnects the second Operation switch, the first either-or switch, the 3rd either-or switch and the 4th
Respective second mobile terminal of either-or switch connects with corresponding fixing end, the first mobile terminal of the second either-or switch with it is corresponding
Fixing end connection.
According to one embodiment of present invention, described device is constructed to be permeable to entering trip temperature to RTD using two-wire system
Cause during collection：
Close the first Operation switch and the second Operation switch, the first either-or switch and the second either-or switch respective
Two mobile terminals connect with corresponding fixing end, the 3rd either-or switch and respective first mobile terminal of the 4th either-or switch with it is right
The fixing end connection answered.
According to one embodiment of present invention, described device is constructed to be permeable to cause when carrying out error calibration：
Disconnect the first Operation switch and the second Operation switch, the first either-or switch and the second either-or switch respective
Two mobile terminals connect with corresponding fixing end, the 3rd either-or switch and respective first mobile terminal of the 4th either-or switch with it is right
The fixing end connection answered.
According to one embodiment of present invention, the voltage acquisition module includes discharge circuit, for the voltage to collection
Signal is amplified processing.
According to one embodiment of present invention, the voltage acquisition module also includes the modulus being connected with the discharge circuit
Change-over circuit, data signal is converted to for the voltage signal after the amplification by simulation to be handled.
According to one embodiment of present invention, when the RTD both end voltage exception that the voltage acquisition module collects
When, closure is disconnected by the first Operation switch and the second Operation switch, with reference to the first either-or switch, the second either-or switch,
3rd either-or switch and the 4th respective connection situation of either-or switch, fault diagnosis is carried out to RTD connection line and is determined
Position.
According to one embodiment of present invention, when the RTD both end voltage exception that the voltage acquisition module collects
When, closure is disconnected by the first Operation switch and the second Operation switch, with reference to the first either-or switch, the second either-or switch,
3rd either-or switch and the 4th respective connection situation of either-or switch, fault diagnosis is carried out to RTD connection line.
Present invention offers following beneficial effect.
Present invention employs the precision resister being internally integrated, and acquisition system under different temperatures environment is calculated so as to realize
Conformity error.To switch in addition, present invention employs switch, flexibly configurable two, three, the temperature acquisition scheme of four-wire system,
So as to the situation of compatible a variety of accuracy requirements, and can accurately carry out any cable disconnection of four-wire system temperature acquisition system
Fault diagnosis and positioning, the intelligent fault diagnosis of two-wire system and three-wire system, so as to substantially increase the Consumer's Experience of product, reduce
The cost and risk of field failure investigation.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and obtained in claim and accompanying drawing.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, required in being described below to embodiment
Accompanying drawing does simple introduction：
Fig. 1 is a kind of structural representation of platinum resistance temperature harvester according to an embodiment of the invention；
Fig. 2 is a kind of system block diagram of platinum resistance temperature harvester according to an embodiment of the invention；
Fig. 3 is a kind of schematic diagram of two-wire system platinum resistance temperature collection according to an embodiment of the invention.
Embodiment
Embodiments of the present invention are described in detail below with reference to drawings and Examples, and how the present invention is applied whereby
Technological means solves technical problem, and the implementation process for reaching technique effect can fully understand and implement according to this.Need to illustrate
As long as not forming conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other,
The technical scheme formed is within protection scope of the present invention.
It is most of if the circuit built using discrete device in the design of existing platinum resistance temperature acquisition system
Product under the conditions of the line error of external cabling is considered, can use three lines or four-wire system to reduce error.In other sides
In case, then high-precision AD sampling A/D chips are employed to reduce transformed error.Scheme also is passed through before product appearance
External equipment carries out error calibration to circuit, so as to reduce conformity error in follow-up use.
These schemes fail fully and effectively to realize high precision collecting.The first, second scheme is to the uniformity of system
Error is helpless, and four-wire system at the scene using there is short-term failure in the case of can not carry out breakdown judge in time and determine
Position；The third scheme then requires very high to product export test calibration, and especially discrete device has temperature drift characteristic, different temperatures
In the case of calibration value it is different, thus the elimination of conformity error can not be carried out well.
It is a kind of platinum resistance temperature harvester structural representation according to one embodiment of the present of invention as shown in Figure 1,
Below with reference to Fig. 1, the present invention is described in detail.
As shown in figure 1, the platinum resistance temperature harvester includes constant-current source 3, self diagnosis and demarcating module 2 and voltage acquisition
Module 4.Wherein, constant-current source 3 is used to provide constant DC signal；Self diagnosis and demarcating module 2 respectively with constant-current source and platinum to be measured
Resistance 1 is connected, and error calibration and fault diagnosis are carried out to RTD 1 to be measured based on the direct current signal that constant-current source 3 provides；Voltage is adopted
Collection module 2 is connected with self diagnosis and demarcating module 2, and the voltage letter for gathering RTD 1 to be measured is controlled by self diagnosis and demarcating module 2
Number to realize temperature acquisition.
The present invention can not only realize carries out temperature acquisition by RTD, additionally it is possible to by self diagnosis and demarcating module come
The error calibration of whole acquisition system is carried out in the case of not external RTD 1.In addition, self diagnosis and demarcating module 2 also may be used
With the fault diagnosis to be broken when in the case of external PT100 RTDs 1 in collection voltages exception, so as to solve cable mistake
Difference, device conformity error problem, while can also realize that line disconnection failure diagnoses in time.
In one embodiment of the invention, as shown in Fig. 2 the self diagnosis and demarcating module include the first either-or switch
21st, the second either-or switch 22, the 3rd either-or switch 23 and the 4th either-or switch 24.Wherein, the first either-or switch 21
Fixing end be connected with constant-current source 3, the first mobile terminal is connected with the one end of RTD 1, the second mobile terminal and high-precision calibrating resistance
27 one end connect；The fixing end of second either-or switch 22 is connected with the input port of voltage acquisition module 4 one, the first mobile terminal with
The first mobile terminal connection of first either-or switch 21, the second mobile terminal and the second mobile terminal of the first either-or switch 21 connect
Connect, the first mobile terminal is connected with the second mobile terminal by the first Operation switch 25；The fixing end of 3rd either-or switch 23 and electricity
Another input port connection of acquisition module 4 is pressed, the first mobile terminal is connected with the other end of high-precision calibrating resistance 27, the second movement
End is connected with the other end of RTD 1, and the first mobile terminal is connected with the second mobile terminal by the second Operation switch 26；4th alternative
The fixing end of switch 24 is connected to ground, and the first mobile terminal is connected with the other end of high-precision calibrating resistance 27, the second mobile terminal and platinum
The other end connection of resistance 1.Pass through each either-or switch, Operation switch and high-precision calibrating electricity in self diagnosis and demarcating module 2
The cooperation of resistance 1, it is possible to achieve four-wire system, three-wire system and two line system temp collection, and the mistake of whole temperature acquisition system can be realized
Difference demarcation, disconnection fault diagnosis during collection voltages exception can also be realized.
Specifically, when carrying out temperature acquisition to RTD using four-wire system, the device can disconnect the first Operation switch 25
With the second Operation switch 26, the first either-or switch 21 and 22 respective first mobile terminal of the second either-or switch and corresponding solid
Fixed end connects, and the 3rd either-or switch 23 and 24 respective second mobile terminal of the 4th either-or switch and corresponding fixing end connect
It is logical.Each Operation switch and each either-or switch coordinate, i.e., by one end of RTD 1 respectively with constant-current source 1 and voltage acquisition module 4
An input port connection, another input port of the other end respectively with ground and voltage acquisition module 4 is connected, so as to realize four lines
Platinum resistance temperature collection processed.
When carrying out temperature acquisition to RTD using three-wire system, the device can close the first Operation switch 25, disconnect the
Two Operation switches 26, the first either-or switch 21, the 3rd either-or switch 23 and the 4th either-or switch 24 respective second move
Moved end connects with corresponding fixing end, and the first mobile terminal of the second either-or switch 22 connects with corresponding fixing end.Each operation
Switch and each either-or switch coordinate, i.e., are connected one end of RTD 1 with an input port of voltage acquisition module 4, another
End and another input port of voltage acquisition module 4 and be connected, so as to realize the collection of three-wire system platinum resistance temperature.
When carrying out temperature acquisition to RTD using two-wire system, the device can close the first Operation switch 25 and the second behaviour
Make switch 26, the first either-or switch 21 and 22 respective second mobile terminal of the second either-or switch connect with corresponding fixing end
Logical, the 3rd either-or switch 23 and 24 respective first mobile terminal of the 4th either-or switch connect with corresponding fixing end.Each behaviour
Make switch and each either-or switch coordinates, i.e., it is RTD 1 is in parallel with high-precision calibrating resistance 27, as shown in figure 3, so as to realize
Two-wire system platinum resistance temperature gathers.
When carrying out error calibration using device of the present invention, the first Operation switch 25 and the second Operation switch are disconnected
26, the first either-or switch 21 and 22 respective second mobile terminal of the second either-or switch connect with corresponding fixing end, and the 3rd
23 and the 4th either-or switch of either-or switch, 24 respective first mobile terminal connects now with corresponding fixing end, outside
PT100 RTDs 1 are off.The electric current of constant-current source 3 flows to GND, voltage acquisition module 4 through high-precision calibrating resistance 27
Gather the both end voltage of high-precision calibrating resistance 27.By calculating actual voltage value/theoretical voltage value of demarcation resistance, so as to accurate
Ground calculates the conformity error for the whole acquisition system being made up of constant-current source 3, high-precision calibrating resistance 27 and voltage acquisition module 4
Value.
When the RTD both end voltage exception that voltage acquisition module is collected using four-wire system, pass through the first Operation switch
25 and second Operation switch 26 disconnect closure, opened with reference to the first either-or switch 21, the second either-or switch 22, the 3rd alternative
23 and 24 respective connection situation of the 4th either-or switch are closed, fault diagnosis and positioning are carried out to each connection line of RTD.
For example, during using four-wire system, collection voltages 0, now the first Operation switch 25 is closed, the second Operation switch 26
Disconnect, the first, third and fourth either-or switch respectively move by the second mobile terminal of connection, the second either-or switch 22 connection first
End, now PT100 RTDs 1 are in three-wire system connection.Such as now temperature acquisition is normal, then illustrates the first either-or switch 21
1 end is output to the cable disconnection of PT100 RTDs 1.
If collection voltages are the exceptional value of non-zero and non-full scale, now the first Operation switch 25 is disconnected, the second operation
The closure of switch 26, first, second, third, fourth either-or switch respectively connect the second mobile terminal, and now PT100 RTDs 1 are in
Three-wire system connection.As now temperature acquisition is normal, then illustrate the defeated of 1 end of the second either-or switch 21 and the first Operation switch 25
Go out the cable disconnection that common port is output to PT100 RTDs 1.
During using four-wire system, collection voltages 0, now the first Operation switch 25 being disconnected, the second Operation switch 26 closes,
First, second, third, fourth either-or switch respectively connects the first mobile terminal, and now PT100 RTDs 1 are in three-wire system connection.
Such as now temperature acquisition is normal, then illustrates that 2 ends of the 4th either-or switch 24 are output to the cable disconnection of PT100 RTDs 1.
If collection voltages to outrange, now disconnect the first Operation switch 25, the second Operation switch 26, first, the
3rd, respectively the first mobile terminal of connection, the second either-or switch 22 connect the second mobile terminal to the 4th either-or switch.As now temperature is adopted
Collection is normal, then illustrates that 2 ends of the 3rd either-or switch 23 and the second Operation switch 26 export common port to PT100 RTDs 1
Cable disconnection.
In addition, using with upper switch come combine can also judge and meanwhile two even the above disconnection fault, it is no longer detailed herein
State.
When voltage acquisition module uses three-wire system or two-wire system, during the RTD both end voltage exception collected, pass through
One Operation switch 25 and the second Operation switch 26 disconnect closure, with reference to the first either-or switch 21, the second either-or switch 22, the
24 respective connection situation of three either-or switch 23 and the 4th either-or switch, fault diagnosis is carried out to RTD connection line.
For example, during using two-wire system as shown in Figure 3, when not connecing outside PT100 RTDs 1, can also realize calculating by constant-current source 3,
The conformity error for the inside acquisition system that precision resister 27 and voltage acquisition module 4 form.When external PT100 RTDs 1
When, go out actual temperature value using conformity error energy inverse, but spliced cable error can not be eliminated.Meanwhile program energy
Real on-site cable open circuit fault diagnosis, but it is clear that specifically that root cable can not be positioned.
Using can also realize real on-site cable open circuit fault Precise Diagnosis during three-wire system, similar to four-wire system short trouble essence
Make a definite diagnosis disconnected.Due to two kinds of three-wire connection, the single channel disconnection fault of every kind of connection accurately judges three kinds of situations, and multichannel breakdown judge is more
It is more, no longer it is described in detail herein.
In one embodiment of the invention, the voltage acquisition module 4 includes discharge circuit, for the voltage letter to collection
Number it is amplified processing.The voltage acquisition module also includes the analog to digital conversion circuit that is connected with discharge circuit, for by simulation
Voltage signal after amplification is converted to data signal to be handled.
Present invention employs precision resister is internally integrated, acquisition system under different temperatures environment is calculated so as to realize
Conformity error.To switch in addition, present invention employs switch, flexibly configurable two, three, the temperature acquisition scheme of four-wire system, energy
The situation of enough compatible a variety of accuracy requirements, and the failure for any cable disconnection that can accurately carry out four-wire system temperature acquisition system is examined
Disconnected and positioning, two-wire system and three-wire system intelligent fault diagnosis, so as to substantially increase the Consumer's Experience of product, reduces scene
The cost and risk of malfunction elimination.
While it is disclosed that embodiment as above, but described content only to facilitate understand the present invention and adopt
Embodiment, it is not limited to the present invention.Any those skilled in the art to which this invention pertains, this is not being departed from
On the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But the scope of patent protection of the present invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of platinum resistance temperature harvester, including：
Constant-current source, for providing constant DC signal；
Self diagnosis and demarcating module, it is connected, is provided based on the constant-current source straight with the constant-current source and RTD to be measured respectively
Flow signal and RTD carries out error calibration and fault diagnosis；
Voltage acquisition module, it is connected with the self diagnosis and demarcating module, by the self diagnosis and demarcating module control collection platinum
The voltage signal of resistance is to realize temperature acquisition.
2. device according to claim 1, it is characterised in that the self diagnosis and demarcating module include：
First either-or switch, its fixing end are connected with the constant-current source, and the first mobile terminal is connected with RTD one end, and second moves
Moved end is connected with high-precision calibrating resistance one end；
Second either-or switch, its fixing end are connected with the input port of voltage acquisition module one, the first mobile terminal and first
The first mobile terminal connection of either-or switch, the second mobile terminal is connected with the second mobile terminal of the first either-or switch, and described the
First mobile terminal of two either-or switch is connected with the second mobile terminal by the first Operation switch；
3rd either-or switch, its fixing end are connected with another input port of the voltage acquisition module, the first mobile terminal and height
The precision calibration resistance other end is connected, and the second mobile terminal is connected with the RTD other end, and the first of the 3rd either-or switch
Mobile terminal is connected with the second mobile terminal by the second Operation switch；
4th either-or switch, its fixing end are connected to ground, and the first mobile terminal is connected with the high-precision calibrating resistance other end, and second
Mobile terminal is connected with the RTD other end.
3. device according to claim 2, it is characterised in that described device is constructed to be permeable to electric to platinum using four-wire system
Resistance cause during temperature acquisition：
The first Operation switch and the second Operation switch are disconnected, the first either-or switch and the second either-or switch respective first move
Moved end connects with corresponding fixing end, the 3rd either-or switch and respective second mobile terminal of the 4th either-or switch and corresponding
Fixing end connects.
4. device according to claim 2, it is characterised in that described device is constructed to be permeable to electric to platinum using three-wire system
Resistance cause during temperature acquisition：
The first Operation switch is closed, disconnects the second Operation switch, the first either-or switch, the 3rd either-or switch and the four or two choosing
One respective second mobile terminal of switch connects with corresponding fixing end, the first mobile terminal of the second either-or switch with it is corresponding solid
Fixed end connects.
5. device according to claim 2, it is characterised in that described device is constructed to be permeable to electric to platinum using two-wire system
Resistance cause during temperature acquisition：
The first Operation switch and the second Operation switch are closed, the first either-or switch and the second either-or switch respective second move
Moved end connects with corresponding fixing end, the 3rd either-or switch and respective first mobile terminal of the 4th either-or switch with it is corresponding
Fixing end connects.
6. device according to claim 2, it is characterised in that described device is constructed to be permeable to make when carrying out error calibration
：
The first Operation switch and the second Operation switch are disconnected, the first either-or switch and the second either-or switch respective second move
Moved end connects with corresponding fixing end, the 3rd either-or switch and respective first mobile terminal of the 4th either-or switch with it is corresponding
Fixing end connects.
7. device according to claim 1, it is characterised in that the voltage acquisition module includes discharge circuit, for pair
The voltage signal of collection is amplified processing.
8. device according to claim 7, it is characterised in that the voltage acquisition module also includes and the discharge circuit
The analog to digital conversion circuit of connection, data signal is converted to for the voltage signal after the amplification by simulation to be handled.
9. device according to claim 3, it is characterised in that when the RTD both ends that the voltage acquisition module collects
During electric voltage exception, closure is disconnected by the first Operation switch and the second Operation switch, with reference to the first either-or switch, the two or two choosing
One switch, the 3rd either-or switch and the 4th respective connection situation of either-or switch, failure is carried out to RTD connection line
Diagnosis and positioning.
10. the device according to claim 4 or 5, it is characterised in that when the RTD that the voltage acquisition module collects
During both end voltage exception, closure is disconnected by the first Operation switch and the second Operation switch, with reference to the first either-or switch, second
Either-or switch, the 3rd either-or switch and the 4th respective connection situation of either-or switch, RTD connection line is carried out
Fault diagnosis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610634355.5A CN107687905B (en) | 2016-08-04 | 2016-08-04 | Platinum resistance temperature acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610634355.5A CN107687905B (en) | 2016-08-04 | 2016-08-04 | Platinum resistance temperature acquisition device |
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| Publication Number | Publication Date |
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| CN107687905A true CN107687905A (en) | 2018-02-13 |
| CN107687905B CN107687905B (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN108775972A (en) * | 2018-04-17 | 2018-11-09 | 上海船舶运输科学研究所 | The fault detection circuit of thermistor temperature detecting circuit |
| CN110057462A (en) * | 2019-05-29 | 2019-07-26 | 苏州英威腾电力电子有限公司 | A kind of temperature sensing circuit |
| CN110702252A (en) * | 2019-11-12 | 2020-01-17 | 天津津航计算技术研究所 | Platinum resistance temperature measuring instrument with quick self-checking function |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107687905B (en) | 2020-01-14 |
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