CN108775972A - The fault detection circuit of thermistor temperature detecting circuit - Google Patents
The fault detection circuit of thermistor temperature detecting circuit Download PDFInfo
- Publication number
- CN108775972A CN108775972A CN201810342217.9A CN201810342217A CN108775972A CN 108775972 A CN108775972 A CN 108775972A CN 201810342217 A CN201810342217 A CN 201810342217A CN 108775972 A CN108775972 A CN 108775972A
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- Prior art keywords
- temperature detecting
- thermistor temperature
- circuit
- detecting circuit
- converter
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- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- G01K7/22—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 non-linear resistance, e.g. thermistor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
A kind of fault detection circuit of thermistor temperature detecting circuit, including detection resistance, A/D converter and processing unit, the detection resistance is series on the return line of constant-current source thermistor temperature detecting circuit, the A/D converter is connect with the both ends of the detection resistance, and the processing unit is connect with the A/D converter.The present invention is used carries out fault detect independently of the A/D converter except thermistor temperature detecting circuit itself A/D conversion chips, and temp sensing function synchronous can carry out with fault detection capability, be independent of each other.
Description
Technical field
The invention belongs to thermistor temperature detecting technical field more particularly to a kind of fault detects of thermistor temperature detecting circuit
Circuit.
Background technology
Currently, thermistor temperature detecting circuit generally use constant-current source principle or unbalanced bridge principle are realized, using constant current
The resistance temperature measurement circuit of source principle has Low Drift Temperature and interface mode, and flexibly etc. comparative advantages, circuit interface pass through simple change
The temperature measurement circuit of two-wire system, three-wire system, four-wire system thermistor can be realized, constant-current source principle is easier to realize degree of precision
Thermistor temperature detecting circuit.
With the continuous development of observation and control technology, more stringent requirements are proposed to thermosensitive resistance measurement circuit for system level design,
The Stability and veracity of measurement is not required nothing more than, more proposes the demand in terms of fault diagnosis, it is desirable that thermistor temperature detecting
Circuit is able to detect that thermistor open circuit fault or line broken circuit failure.
Currently, the A/D conversion chip negligible amounts with burn out detection function that market is on sale：First, this kind of A/D conversions
Chip price is higher；Secondly, this kind of A/D conversion chips carry out usually requiring to switch into a kind of " broken string when burn out detection
Detection pattern " switches back into " normal A/D sampling configurations " after burn out detection, i.e., normal A/D sampling processes and burn out detection again
Process cannot synchronize progress.
Invention content
Based on this, in view of the above technical problems, a kind of fault detection circuit of thermistor temperature detecting circuit is provided.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of fault detection circuit of thermistor temperature detecting circuit, including detection resistance, A/D converter and processing are single
Member, the detection resistance are series on the return line of constant-current source thermistor temperature detecting circuit, the A/D converter and the inspection
The both ends of measuring resistance connect, and the processing unit is connect with the A/D converter.
The A/D converter is the A/D converter that the microcontroller of the constant-current source thermistor temperature detecting circuit is internally integrated,
The processing unit is the processing unit that the microcontroller of the constant-current source thermistor temperature detecting circuit is internally integrated.
The A/D converter is connect through impedance circuit with the both ends of the detection resistance.
The constant-current source thermistor temperature detecting circuit is two-wire system, three-wire system or four-wire system.
The present invention is used carries out event independently of the A/D converter except thermistor temperature detecting circuit itself A/D conversion chips
Barrier detection, temp sensing function and fault detection capability synchronous can carry out, be independent of each other.
Description of the drawings
The present invention is described in detail with reference to the accompanying drawings and detailed description：
Fig. 1 is the structural diagram of the present invention one；
Fig. 2 is the structural schematic diagram two of the present invention.
Specific implementation mode
As shown in Figure 1 and Figure 2, a kind of fault detection circuit of thermistor temperature detecting circuit, including detection resistance
RDETECT, A/D converter 110 and processing unit.
Detection resistance RDETECTIt is series on the return line 21 of constant-current source thermistor temperature detecting circuit 20, is examined by judging
Measuring resistance RDETECTVoltage value VDETECT, it can be achieved that failure (the thermistor open circuit with the synchronous operation of thermistor temperature detecting function
Failure or line broken circuit failure) detection function.
It should be pointed out that constant-current source thermistor temperature detecting circuit 20 is two-wire system, three-wire system or four-wire system.
The constant-current source thermistor temperature detecting circuit 20 of two-wire system have a return line 21, a whereabouts circuit 22, such as
Shown in Fig. 1, the constant-current source thermistor temperature detecting circuit 20 of three-wire system has a return line 21, two whereabouts circuits 22, such as
Shown in Fig. 2, the constant-current source thermistor temperature detecting circuit 20 of four-wire system has a return line 21, three whereabouts circuits 22.
Wherein, resistance R is all had on every return line 21 and whereabouts circuit 22L, thermistor RTWith whereabouts circuit 22
Connection.
A/D converter 110 and detection resistance RDETECTBoth ends connection.
Processing unit is connect with A/D converter 110.
Wherein, the A/D conversions that A/D converter 110 is internally integrated for the microcontroller of constant-current source thermistor temperature detecting circuit 20
Device, processing unit are the processing unit that the microcontroller of constant-current source thermistor temperature detecting circuit 20 is internally integrated.Due in microcontroller
The integrated A/D converter digit in portion is relatively low, such as is internally integrated the A/D converter of 8 conversion accuracies, generally can not be enough in reality
Therefore the thermistor temperature detecting circuit that existing instrument grade measurement accuracy requires usually is idle and does not have to, and thermistor temperature detecting function
Usually select that precision is higher, independent A/D conversion chips realize that the idle A/D that microcontroller is internally integrated by the present invention turns
Parallel operation uses, and reduces cost.
A/D converter 110 is through impedance circuit 120 and detection resistance RDETECTBoth ends connection, certain microcontrollers are internally integrated
A/D converter signal input interface impedance it is relatively low, in order to reduce circuit of the present invention to having thermistor temperature detecting circuit
It influences, the method that may be selected to increase impedance circuit 120, to improve the input impedance for adding break detection circuit.
The present invention is used to be carried out independently of the A/D converter 110 except thermistor temperature detecting circuit itself A/D conversion chips
Fault detect, temp sensing function and fault detection capability synchronous can carry out, be independent of each other.
As shown in Figure 1, by taking the constant-current source thermistor temperature detecting circuit 20 of three-wire system as an example, the detection resistance R of selectionDETECT
Resistance value and resistance RLResistance value it is equal.
By differentiating voltage value VDETECTIt can be seen that normal/broken string situation of thermistor and circuit：
If voltage value VDETECT≈2ICRL, then show thermistor RTIt is normal with thermometric circuit；
If voltage value VDETECT≈ICRL, then show " thermistor RTBroken string " or " broken string of 1# whereabouts circuit 22 " or " 2# is gone
Break to circuit 22 "；
If voltage value VDETECT≈ 0 then shows " thermistor RTBreak simultaneously with 2# whereabouts circuit 22 " or " 1# whereabouts lines
Road 22 and 2# whereabouts circuit 22 break simultaneously " or " broken string of back circuit 21 ".
Wherein, ICFor the electric current of whereabouts circuit.
But those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate this
Invention, and be not used as limitation of the invention, as long as in the spirit of the present invention, to embodiment described above
Variation, modification will all fall within the scope of claims of the present invention.
Claims (4)
1. a kind of fault detection circuit of thermistor temperature detecting circuit, which is characterized in that including detection resistance, A/D converter with
And processing unit, the detection resistance are series on the return line of constant-current source thermistor temperature detecting circuit, the A/D converter
It is connect with the both ends of the detection resistance, the processing unit is connect with the A/D converter.
2. a kind of fault detection circuit of thermistor temperature detecting circuit according to claim 1, which is characterized in that the A/
D converters are the A/D converter that the microcontroller of the constant-current source thermistor temperature detecting circuit is internally integrated, and the processing unit is
The processing unit that the microcontroller of the constant-current source thermistor temperature detecting circuit is internally integrated.
3. a kind of fault detection circuit of thermistor temperature detecting circuit according to claim 2, which is characterized in that the A/
D converters are connect through impedance circuit with the both ends of the detection resistance.
4. a kind of fault detection circuit of thermistor temperature detecting circuit according to claim 3, which is characterized in that the perseverance
Stream source thermistor temperature detecting circuit is two-wire system, three-wire system or four-wire system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810342217.9A CN108775972A (en) | 2018-04-17 | 2018-04-17 | The fault detection circuit of thermistor temperature detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810342217.9A CN108775972A (en) | 2018-04-17 | 2018-04-17 | The fault detection circuit of thermistor temperature detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108775972A true CN108775972A (en) | 2018-11-09 |
Family
ID=64033947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810342217.9A Pending CN108775972A (en) | 2018-04-17 | 2018-04-17 | The fault detection circuit of thermistor temperature detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108775972A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5560828A (en) * | 1978-11-01 | 1980-05-08 | Nippon Steel Corp | Detector for thermocouple failure |
| JPH1062265A (en) * | 1996-08-21 | 1998-03-06 | Hanshin Electric Co Ltd | Temperature detector |
| JP2004028622A (en) * | 2002-06-21 | 2004-01-29 | Canon Inc | Temperature detection device and image forming device |
| CN1918460A (en) * | 2003-12-19 | 2007-02-21 | 西门子公司 | Measuring device, in particular a temperature measuring transducer |
| CN102435894A (en) * | 2011-11-15 | 2012-05-02 | 浙江大学 | Digital leakage protector tester and test method thereof |
| CN102589750A (en) * | 2012-02-20 | 2012-07-18 | 中国气象局气象探测中心 | Fault detection structure for automatic weather station temperature sensor |
| CN102866319A (en) * | 2012-09-27 | 2013-01-09 | 重庆华渝电气仪表总厂 | Fault diagnosis circuit based on AD convertor of single chip microcomputer |
| CN202928715U (en) * | 2012-11-01 | 2013-05-08 | 深圳市泛海三江电子有限公司 | Temperature transmitter with self-detecting function |
| CN204903669U (en) * | 2015-07-06 | 2015-12-23 | 武汉钢铁(集团)公司 | Tester |
| CN204925298U (en) * | 2015-08-21 | 2015-12-30 | 深圳市振邦智能科技有限公司 | Ntc thermistor's failure detector circuit and temperature measurement circuit |
| CN205262632U (en) * | 2016-01-05 | 2016-05-25 | 魏德米勒电联接（上海）有限公司 | Multi -functional differential input RTD temperature measurement circuit |
| CN107687905A (en) * | 2016-08-04 | 2018-02-13 | 中车株洲电力机车研究所有限公司 | A kind of platinum resistance temperature harvester |
| CN208125290U (en) * | 2018-04-17 | 2018-11-20 | 上海船舶运输科学研究所 | A kind of fault detection circuit structure of thermistor temperature detecting circuit |
-
2018
- 2018-04-17 CN CN201810342217.9A patent/CN108775972A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5560828A (en) * | 1978-11-01 | 1980-05-08 | Nippon Steel Corp | Detector for thermocouple failure |
| JPH1062265A (en) * | 1996-08-21 | 1998-03-06 | Hanshin Electric Co Ltd | Temperature detector |
| JP2004028622A (en) * | 2002-06-21 | 2004-01-29 | Canon Inc | Temperature detection device and image forming device |
| CN1918460A (en) * | 2003-12-19 | 2007-02-21 | 西门子公司 | Measuring device, in particular a temperature measuring transducer |
| CN102435894A (en) * | 2011-11-15 | 2012-05-02 | 浙江大学 | Digital leakage protector tester and test method thereof |
| CN102589750A (en) * | 2012-02-20 | 2012-07-18 | 中国气象局气象探测中心 | Fault detection structure for automatic weather station temperature sensor |
| CN102866319A (en) * | 2012-09-27 | 2013-01-09 | 重庆华渝电气仪表总厂 | Fault diagnosis circuit based on AD convertor of single chip microcomputer |
| CN202928715U (en) * | 2012-11-01 | 2013-05-08 | 深圳市泛海三江电子有限公司 | Temperature transmitter with self-detecting function |
| CN204903669U (en) * | 2015-07-06 | 2015-12-23 | 武汉钢铁(集团)公司 | Tester |
| CN204925298U (en) * | 2015-08-21 | 2015-12-30 | 深圳市振邦智能科技有限公司 | Ntc thermistor's failure detector circuit and temperature measurement circuit |
| CN205262632U (en) * | 2016-01-05 | 2016-05-25 | 魏德米勒电联接（上海）有限公司 | Multi -functional differential input RTD temperature measurement circuit |
| CN107687905A (en) * | 2016-08-04 | 2018-02-13 | 中车株洲电力机车研究所有限公司 | A kind of platinum resistance temperature harvester |
| CN208125290U (en) * | 2018-04-17 | 2018-11-20 | 上海船舶运输科学研究所 | A kind of fault detection circuit structure of thermistor temperature detecting circuit |
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