CN107655582B - A kind of temperature measuring circuit based on K-type thermocouple - Google Patents
A kind of temperature measuring circuit based on K-type thermocouple Download PDFInfo
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- CN107655582B CN107655582B CN201710905267.9A CN201710905267A CN107655582B CN 107655582 B CN107655582 B CN 107655582B CN 201710905267 A CN201710905267 A CN 201710905267A CN 107655582 B CN107655582 B CN 107655582B
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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
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/021—Particular circuit arrangements
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Abstract
The present invention is a kind of temperature measuring circuit based on K-type thermocouple, including differential low-pass filter circuit, amplifying circuit, second-order low-pass filter circuit, filters out what voltage conversion circuit of radio frequency interference circuit.Differential low-pass filter circuit is made of two biasing resistors and three capacitors, is improved the level value of temperature signal input, is effectively resisted external interference, enhance the anti-interference ability of circuit.Amplifying circuit is amplified the differential voltage value of input temp signal by voltage conversion chip, is suitable for analog-to-digital conversion, can be improved acquisition precision.Second-order low-pass filter circuit is made of amplifier chip and four precision resisters, filters out the interference of high-frequency voltage signal.Voltage conversion circuit is made of voltage conversion chip and two capacitors, for providing bias voltage to differential low-pass filter circuit, amplifying circuit and second-order low-pass filter circuit circuit.The present invention improves the measurement accuracy of entire circuit, and the structure of measuring circuit is simple, at low cost, function is reliably also easy to realize.
Description
Technical field
The present invention relates to a kind of measuring circuits, especially relate to a kind of measuring circuit of temperature, specifically a kind of to be based on K
The temperature measuring circuit of type thermocouple belongs to heat death theory technical field.
Background technique
Temperature signal is very important test physical quantity, measurement side in industrial production, human lives and scientific research
There are many method, and also there are many classification.K-type thermocouple has the linearity good, and thermo-electromotive force, Thermoelectric Power are larger, temperature coefficient, specific potential
The advantages that small, sensitivity is higher, and stability and uniformity are preferable, and antioxygenic property is strong, cheap can be used for oxidisability, lazy
In property gas.Therefore the design selects K-type thermocouple as temperature-sensing element (device).The basic principle of thermocouple temperature measurement is thermoelectricity effect
It answers, i.e., two different conductor (or semiconductor) both ends are welded to form closed circuit, the environment temperature locating for two junctions
When different, thermoelectrical potential, i.e. Seebeck potential can be generated in circuit.Since the thermo-electromotive force of generation is fainter, need by
Instrument amplifier amplification.But since measurement environment is more complicated, the input terminal of instrument amplifier is easy by radio frequency interference, out
Existing offset voltage.And low-pass filter is can not to filter out this radio frequency interference, influences the measurement accuracy of temperature.
Summary of the invention
In view of above-mentioned problems of the prior art, it is a kind of novel based on K-type that the purpose of the present invention is researching and designings
The temperature measuring circuit of thermocouple, to solve the problems, such as that previous temperature measurement circuit is easy by external interference.
The present invention is achieved through the following technical solutions:
A kind of temperature measuring circuit based on K-type thermocouple, including amplifier chip U1, the first amplifier chip U2A, second
Amplifier chip U2B, first voltage conversion chip U3, second voltage conversion chip U4, the first biasing resistor R1, the second biasing resistor
It is R2, the first precision resister R3, the second precision resister R4, third precision resister R5, the 4th precision resister R6, the 5th high
Accuracy resistance R7, the 6th precision resister R8, the 7th precision resister R9, the first divider resistance R10, the second divider resistance R11,
First capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7,
8th capacitor C8 and the 9th capacitor C9；Wherein, the first pin 1 of amplifier chip U1 connects third precision resister R5, third
The 8th pin 8 of precision resister R5 other end connection amplifier chip U1；One end ground connection of first capacitor C1, another termination the
The other end of two capacitor C2, the second capacitor C2 connects third capacitor C3, the other end ground connection of third capacitor C3；First capacitor C1 with
The termination second that the termination first precision resister R3, third capacitor C3 and the second capacitor C2 that second capacitor C2 is connected is connected
The other end of precision resister R4, the first precision resister R3 connect the first biasing resistor R1, and the second precision resister R4's is another
The other end that one end connects the second biasing resistor R2, the first biasing resistor R1 and the second biasing resistor R2 meets bias voltage V1,
The part that first biasing resistor R1 connects with the first precision resister R3 is the input anode of thermocouple signal, the second biasing resistor
The part that R2 connects with the second precision resister R4 is the input negative terminal of thermocouple signal；The third pin 3 of amplifier chip U1
Connect the joint of first capacitor C1 and the second capacitor C2, the second pin 2 of amplifier chip U1 connects third capacitor C3 and the
The joint of two capacitor C2, the 5th pin 5 of amplifier chip U1 connect reference voltage V2, the 6th pin 6 of amplifier chip U1
The 4th precision resister R6 is connected, the other end of the 4th precision resister R6 connects the 4th capacitor C4, the 5th precision resister R7
It is grounded with the other end of the 7th precision resister R9, the 4th capacitor C4；The first amplifier of another termination of 7th precision resister R9
The first pin 1 of chip U2A, the second pin 2 of the first amplifier chip of another termination U2A of the 5th precision resister R7, the 6th
Third pin 3, another termination bias voltage V1 of a first amplifier chip U2A of termination of precision resister R8；5th capacitor C5
One termination the first amplifier chip U2A the first pin 1, it is another termination the first amplifier chip U2A the second pin 2；Second fortune
The 6th pin 6 for putting chip U2B connects with the 7th pin 7, the first pin 1 of the first amplifier chip U2A and the second amplifier chip
The 5th pin 5 of U2B connects, and the 7th pin 7 of the second amplifier chip U2B is the output end of signal；First voltage conversion chip
U3 and the 6th capacitor C6, the 7th capacitor C7 form voltage transformation module, and 5V voltage is converted into bias voltage V1；6th capacitor C6
One termination first voltage conversion chip U3 the first pin 1, it is another termination first voltage conversion chip U3 third pin 3,
The second pin 2, another termination first voltage conversion chip U3 of a termination first voltage conversion chip U3 of 7th capacitor C7
Third pin 3, the first pin 1 of first voltage conversion chip U3 connects 5V voltage, third pin 3 is grounded, the second pin 2 is biasing
The output end of voltage V1；Second voltage conversion chip U4 and the first divider resistance R10, the second divider resistance R11, the 8th capacitor
C8, the 9th capacitor C9 form the module of voltage V1 conversion voltage V2, the second divider resistance R11, the 8th capacitor C8 and the 9th capacitor
C9 is in parallel, and the third pin 3 of a termination second voltage conversion chip U4 in parallel, other end ground connection in parallel, the first partial pressure
Third pin 3, another termination bias voltage V1 of a termination second voltage conversion chip U4 of resistance R10, second voltage conversion
The second pin 2 of chip U4 connects with its 6th pin 6, and the 6th pin 6 of second voltage conversion chip U4 is benchmark voltage V2
Output end.
Thermocouple generates electromotive force by inputting anode and input negative terminal to the second pin 2 and third of amplifier chip U1
3 signal of pin.Small-signal is exported after amplification by the 6th pin 6 of amplifier chip U1.First amplifier chip U2A
Second order is formed with the 4th precision resister R6, the 5th precision resister R7, the 6th precision resister R8, the 7th precision resister R9
Voltage-controlled low-pass filter.Second amplifier chip U2B, which forms follower, enhances load capacity.First voltage conversion chip U3 is electric by 5V
Pressure is converted into the bias voltage that 1.248V promotes input signal.Second voltage conversion chip U4 and the first divider resistance R10, second
1.248V is converted into 0.303V voltage by divider resistance R11, the 8th capacitor C8, the 9th capacitor C9, is provided for amplifier chip U1
Reference voltage.
The model AD623 of the amplifier chip U1 as a preferred technical solution, first amplifier chip
The model OPA4340UA of U2A and the second amplifier chip U2B, the model of the first voltage conversion chip U3
MAX6061, the model OP113 of the second voltage conversion chip U4.
The first biasing resistor R1 and the second biasing resistor R2 value are 5.1K as a preferred technical solution,
Ω, the first capacitor C1 and third capacitor C3 value are 1000pF, and the second capacitor C2 value is 0.022uF,
4th precision resister R6, the 5th precision resister R7 and the 7th precision resister R9 value is 6.2K, described
6th precision resister R8 value is 30K, and the 4th capacitor C4 and the 5th capacitor C5 value are 4.7uF.
Circuit of the present invention increases differential low-pass filter before instrument amplifier, makes input signal into amplifier premise
Preceding offer RF attenuation filter.This increased differential low-pass filter can effectively filter out radio frequency interference, make to pass through instrument amplifier
Thermo-electromotive force largely not by radio frequency interference.Differential low-pass filter is followed by instrument amplifier, i.e. amplifier core
Piece U1；It is voltage-controlled that this is followed by second order, by the first amplifier chip U2A, the 5th precision resister R7, the 6th precision resister R8, the 7th
Precision resister R9, the 4th capacitor C4, the 5th capacitor C5 composition；A follower U2B, i.e. the second amplifier chip are finally met again
U2B forms the measuring circuit of temperature.
The present invention using differential low-pass filter and instrument amplifier can effective amplified difference signal, and filter out
Radio frequency interference not only increases the measurement accuracy of entire circuit, and the structure of measuring circuit is simple, at low cost, function is reliable
It is also easy to realize.
Detailed description of the invention
Attached drawing herein is used to provide to further explanation of the invention, constitutes part of this application, of the invention shows
Meaning property embodiment and its explanation are used to explain the present invention, not constitute improper limitations of the present invention.
Fig. 1 is the circuit diagram of present invention test circuit.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawing.
As basic embodiment, a kind of temperature measuring circuit based on K-type thermocouple, as shown in Figure 1, including amplifier
Chip U1, the first amplifier chip U2A, the second amplifier chip U2B, first voltage conversion chip U3, second voltage conversion chip U4,
First biasing resistor R1, the second biasing resistor R2, the first precision resister R3, the second precision resister R4, third high precision electro
Hinder R5, the 4th precision resister R6, the 5th precision resister R7, the 6th precision resister R8, the 7th precision resister R9, first
Divider resistance R10, the second divider resistance R11, first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 5th
Capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8 and the 9th capacitor C9.
Wherein, the first pin 1 of amplifier chip U1 connects third precision resister R5, and third precision resister R5 is another
The 8th pin 8 of end connection amplifier chip U1；One end ground connection of first capacitor C1, another the second capacitor of termination C2, the second electricity
The other end for holding C2 connects third capacitor C3, the other end ground connection of third capacitor C3；First capacitor C1 is connected with the second capacitor C2
One termination the first precision resister R3, third capacitor C3 and the second capacitor C2 be connected one terminate the second precision resister R4,
The other end of first precision resister R3 connects the other end connection second of the first biasing resistor R1, the second precision resister R4 partially
The other end for setting resistance R2, the first biasing resistor R1 and the second biasing resistor R2 meets bias voltage V1, the first biasing resistor R1
The part to connect with the first precision resister R3 is the input anode of thermocouple signal, the high-precision of the second biasing resistor R2 and second
The part that resistance R4 connects is the input negative terminal of thermocouple signal；The third pin 3 of amplifier chip U1 connects first capacitor C1
With the joint of the second capacitor C2, the second pin 2 connection third capacitor C3 and the second capacitor C2's of amplifier chip U1 connects
Place, the 5th pin 5 of amplifier chip U1 connect reference voltage V2, the 4th high-precision of the 6th pin 6 connection of amplifier chip U1
The other end of resistance R6, the 4th precision resister R6 connect the 4th capacitor C4, the 5th precision resister R7 and the 7th high precision electro
Hinder R9, the other end ground connection of the 4th capacitor C4；The first pipe of the first amplifier chip of another termination U2A of 7th precision resister R9
Foot 1, the second pin 2 of the first amplifier chip of another termination U2A of the 5th precision resister R7, the one of the 6th precision resister R8
Terminate third pin 3, another termination bias voltage V1 of the first amplifier chip U2A；First amplifier of termination of 5th capacitor C5
Second pin 2 of the first pin 1 of chip U2A, the first amplifier chip U2A of another termination；The 6th pipe of second amplifier chip U2B
Foot 6 connects with the 7th pin 7,5 phase of the 5th pin of the first pin 1 and the second amplifier chip U2B of the first amplifier chip U2A
It connects, the 7th pin 7 of the second amplifier chip U2B is the output end of signal；First voltage conversion chip U3 and the 6th capacitor C6,
Seven capacitor C7 form voltage transformation module, and 5V voltage is converted into bias voltage V1, a termination first voltage of the 6th capacitor C6
The third pin 3 of the first pin 1 of conversion chip U3, another termination first voltage conversion chip U3, one end of the 7th capacitor C7
Connect the second pin 2 of first voltage conversion chip U3, the third pin 3 of another termination first voltage conversion chip U3, the first electricity
The first pin 1 of pressure conversion chip U3 connects 5V voltage, the ground connection of third pin 3, the output end that the second pin 2 is bias voltage V1；
Second voltage conversion chip U4 and the first divider resistance R10, the second divider resistance R11, the 8th capacitor C8, the 9th capacitor C9 composition
Voltage V1 converts the module of voltage V2, and the second divider resistance R11, the 8th capacitor C8 are in parallel with the 9th capacitor C9, and in parallel one
Terminate the third pin 3 of second voltage conversion chip U4, other end ground connection in parallel, a termination of the first divider resistance R10 the
The third pin 3 of two voltage conversion chip U4, another termination bias voltage V1, the second pin 2 of second voltage conversion chip U4
Connect with its 6th pin 6, the 6th pin 6 of second voltage conversion chip U4 is the output end of benchmark voltage V2.
In above-mentioned circuit of the present invention, include differential low-pass filter circuit, amplifying circuit, second-order low-pass filter circuit,
Filter out radio frequency interference circuit and voltage conversion circuit.This five partial circuit improves the acquisition precision of temperature signal.First partially
Resistance R1, the second biasing resistor R2, first capacitor C1, the second capacitor C2, third capacitor C3 composition differential low-pass filter circuit are set,
Add bias voltage 1.248V at the both ends of the first biasing resistor R1, the second biasing resistor R2, improves the electricity of temperature signal input
Level values effectively resist external interference, enhance the anti-interference ability of circuit.Amplifying circuit will by first voltage conversion chip U3
The differential voltage value of input temp signal is amplified, and is suitable for analog-to-digital conversion, can be improved acquisition precision.First amplifier chip U2A
Second order is formed with the 4th precision resister R6, the 5th precision resister R7, the 6th precision resister R8, the 7th precision resister R9
Low-pass filter circuit, the partial circuit filter out the interference of high-frequency voltage signal.First voltage conversion chip U3, the 6th capacitor
C6, the 7th capacitor C7 form voltage conversion circuit, 5V are converted to the voltage conversion circuit of 1.248V, this partial circuit is for giving
Differential low-pass filter circuit, amplifying circuit and second-order low-pass filter circuit circuit provide bias voltage.
As a preferred embodiment, the model AD623 of the amplifier chip U1, the first amplifier core
The model OPA4340UA of piece U2A and the second amplifier chip U2B, the model of the first voltage conversion chip U3
MAX6061, the model OP113 of the second voltage conversion chip U4.
As another preferred embodiment, the first biasing resistor R1 and the second biasing resistor R2 value are
5.1K Ω, the first capacitor C1 and third capacitor C3 value are 1000pF, and the second capacitor C2 value is
0.022uF, the 4th precision resister R6, the 5th precision resister R7 and the 7th precision resister R9 value are
6.2K, the 6th precision resister R8 value are 30K, and the 4th capacitor C4 and the 5th capacitor C5 value are
4.7uF。
The course of work of measuring circuit of the present invention are as follows:
When input terminal has signal input, the first biasing resistor R1 connected in parallel, the second biasing resistor R2 meet 1.248V
Input offset voltage is raised.Input signal is by by the first precision resister R3, the second precision resister R4, first capacitor
The differential low-pass filter that C1, the second capacitor C2, third capacitor C3 are formed filters out radio frequency interference, using instrument amplifier
AD623, i.e. amplifier chip U1 are amplified.Signal by amplification is using by the first amplifier chip U2A, the 4th high-precision
Resistance R6, the 5th precision resister R7, the 6th precision resister R8, the 7th precision resister R9, the 4th capacitor C4, the 5th capacitor
The second-order low-pass filter of C5 composition, last signal connect the follower formed by the second amplifier chip U2B again.Wherein second
Voltage conversion chip U4 and the first divider resistance R10, the second divider resistance R11, the 8th capacitor C8, the 9th capacitor C9 comprising modules
1.248V voltage is converted into 0.303V, provides reference voltage for instrument amplifier AD623, i.e. amplifier chip U1, wherein the
Two divider resistance R11 are 15K, the first divider resistance R10 is 7K, the 8th capacitor C8 is 100nF, the 9th capacitor C9 is 1uF.First
5V voltage is converted to 1.248V by the module of voltage conversion chip U3 and the 6th capacitor C6, the 7th capacitor C7 composition, and second order is low
The positive input of bandpass filter provides reference voltage.
The scope of protection of present invention is not limited to the above specific embodiment, to those skilled in the art, this
Invention can there are many deformation and change, it is all design of the invention within principle it is made it is any modification, improve and be equal
Replacement should be all included within protection scope of the present invention.
Claims (2)
1. a kind of temperature measuring circuit based on K-type thermocouple, it is characterised in that: including amplifier chip U1, the first amplifier core
Piece U2A, the second amplifier chip U2B, first voltage conversion chip U3, second voltage conversion chip U4, the first biasing resistor R1,
Two biasing resistor R2, the first precision resister R3, the second precision resister R4, third precision resister R5, the 4th high precision electro
Hinder R6, the 5th precision resister R7, the 6th precision resister R8, the 7th precision resister R9, the first divider resistance R10, second
Divider resistance R11, first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor
C6, the 7th capacitor C7, the 8th capacitor C8 and the 9th capacitor C9；Wherein, the first pin 1 connection third of amplifier chip U1 is high-precision
Resistance R5 is spent, the third precision resister R5 other end connects the 8th pin 8 of amplifier chip U1；A termination of first capacitor C1
The other end connection third capacitor C3 on ground, the second capacitor C2, the second capacitor C2 of another termination, another termination of third capacitor C3
Ground；The termination first precision resister R3, third capacitor C3 and the second capacitor C2 that first capacitor C1 is connected with the second capacitor C2
The other end the first biasing resistor of the connection R1 of the second precision resister R4, the first precision resister R3 of a connected termination, second
The other end of precision resister R4 connects the second biasing resistor R2, the other end of the first biasing resistor R1 and the second biasing resistor R2
Meet bias voltage V1, the part that the first biasing resistor R1 connects with the first precision resister R3 be the input of thermocouple signal just
End, the part that the second biasing resistor R2 connects with the second precision resister R4 are the input negative terminal of thermocouple signal；Amplifier core
The third pin 3 of piece U1 connects the joint of first capacitor C1 and the second capacitor C2, the second pin 2 connection of amplifier chip U1
5th pin 5 of the joint of third capacitor C3 and the second capacitor C2, amplifier chip U1 connects reference voltage V2, amplifier chip
The 6th pin 6 of U1 connects the 4th precision resister R6, and the other end of the 4th precision resister R6 connects the 4th capacitor C4, the 5th
The other end of precision resister R7 and the 7th precision resister R9, the 4th capacitor C4 are grounded；7th precision resister R9's is another
Terminate the first pin 1 of the first amplifier chip U2A, the of the first amplifier chip of another termination U2A of the 5th precision resister R7
Two pins 2, third pin 3, another termination bias voltage of a first amplifier chip U2A of termination of the 6th precision resister R8
V1；5th capacitor C5 one termination the first amplifier chip U2A the first pin 1, it is another termination the first amplifier chip U2A second
Pin 2；The 6th pin 6 of second amplifier chip U2B connects with the 7th pin 7, the first pin 1 of the first amplifier chip U2A with
The 5th pin 5 of second amplifier chip U2B connects, and the 7th pin 7 of the second amplifier chip U2B is the output end of signal；6th
The first pin 1 of a termination first voltage conversion chip U3 of capacitor C6, another third for terminating first voltage conversion chip U3
Pin 3, the second pin 2 of a termination first voltage conversion chip U3 of the 7th capacitor C7, another termination first voltage convert core
The third pin 3 of piece U3, the first pin 1 of first voltage conversion chip U3 connect 5V voltage, the ground connection of third pin 3, the second pin 2
For the output end of bias voltage V1；Second divider resistance R11, the 8th capacitor C8 are in parallel with the 9th capacitor C9, and one end in parallel
Connect the third pin 3 of second voltage conversion chip U4, other end ground connection in parallel, a termination second of the first divider resistance R10
The third pin 3 of voltage conversion chip U4, another termination bias voltage V1, the second pin 2 of second voltage conversion chip U4 with
Its 6th pin 6 connects, and the 6th pin 6 of second voltage conversion chip U4 is the output end of benchmark voltage V2；Wherein, described
The model AD623 of amplifier chip U1, the model of the first amplifier chip U2A and the second amplifier chip U2B
The model MAX6061 of OPA4340UA, the first voltage conversion chip U3, the second voltage conversion chip U4's
Model OP113.
2. a kind of temperature measuring circuit based on K-type thermocouple according to claim 1, it is characterised in that: described
One biasing resistor R1 and the second biasing resistor R2 value are 5.1K Ω, and the first capacitor C1 and third capacitor C3 value are equal
For 1000pF, the second capacitor C2 value is 0.022uF, the 4th precision resister R6, the 5th precision resister
R7 and the 7th precision resister R9 value are 6.2K, and the 6th precision resister R8 value is 30K, the 4th electricity
Hold C4 and the 5th capacitor C5 value is 4.7uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710905267.9A CN107655582B (en) | 2017-09-29 | 2017-09-29 | A kind of temperature measuring circuit based on K-type thermocouple |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710905267.9A CN107655582B (en) | 2017-09-29 | 2017-09-29 | A kind of temperature measuring circuit based on K-type thermocouple |
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| Publication Number | Publication Date |
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| CN107655582A CN107655582A (en) | 2018-02-02 |
| CN107655582B true CN107655582B (en) | 2019-08-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107127Y (en) * | 2007-11-22 | 2008-08-27 | 杭州电子科技大学 | Flame temperature testing circuit of domestic gas range |
| CN103913249A (en) * | 2012-12-29 | 2014-07-09 | 北京谊安医疗系统股份有限公司 | Temperature monitoring circuit device and method |
| CN104006902A (en) * | 2014-06-13 | 2014-08-27 | 四川亚美动力技术有限公司 | Engine exhaust temperature thermocouple detection circuit |
| CN203929264U (en) * | 2014-07-02 | 2014-11-05 | 魏德米勒电联接（上海）有限公司 | A kind of RTD temperature measuring circuit with internal bias |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10234335B2 (en) * | 2014-04-30 | 2019-03-19 | Thermo-Kinetics Company Limited | Thermocouple resistance compensator |
-
2017
- 2017-09-29 CN CN201710905267.9A patent/CN107655582B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107127Y (en) * | 2007-11-22 | 2008-08-27 | 杭州电子科技大学 | Flame temperature testing circuit of domestic gas range |
| CN103913249A (en) * | 2012-12-29 | 2014-07-09 | 北京谊安医疗系统股份有限公司 | Temperature monitoring circuit device and method |
| CN104006902A (en) * | 2014-06-13 | 2014-08-27 | 四川亚美动力技术有限公司 | Engine exhaust temperature thermocouple detection circuit |
| CN203929264U (en) * | 2014-07-02 | 2014-11-05 | 魏德米勒电联接（上海）有限公司 | A kind of RTD temperature measuring circuit with internal bias |
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| CN107655582A (en) | 2018-02-02 |
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