CN209055244U - A kind of circuit and its temperature measurement circuit for simulating thermistor - Google Patents
A kind of circuit and its temperature measurement circuit for simulating thermistor Download PDFInfo
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- CN209055244U CN209055244U CN201821531500.8U CN201821531500U CN209055244U CN 209055244 U CN209055244 U CN 209055244U CN 201821531500 U CN201821531500 U CN 201821531500U CN 209055244 U CN209055244 U CN 209055244U
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Abstract
The utility model provides a kind of circuit for simulating thermistor, using thermistor plate as the output end of simulation thermistor, the thermistor plate includes the first temperature-sensitive board, the second temperature-sensitive board, the first temperature-sensitive board is also connect with the first relay, first relay is connect with first resistor and the adjustable working cell of resistance value respectively, and the first resistor and the adjustable working cell of resistance value are connect with the second temperature-sensitive board respectively.The utility model also provides a kind of temperature measurement circuit.The circuit of simulation thermistor described in the utility model, temperature test coverage rate is high, temperature test is at low cost, temperature test is high-efficient.
Description
Technical field
The utility model belongs to automatic test field of measuring technique, and in particular to it is a kind of simulate thermistor circuit and
Its temperature measurement circuit.
Background technique
Currently, can carry out temperature acquisition test using thermistor, thermistor is that the fuel factor based on resistance carries out temperature
The characteristic spending measurement, i.e. the resistance value variation with temperature of resistor body and changing.Therefore, as long as measuring the resistance of temperature-sensitive thermal resistance
Value variation, so that it may measure temperature.
Thermistor mainly has two class of metal fever resistance and semiconductor thermistor, wherein the resistance value of metal fever resistance
It can generally be indicated with approximate relation below with temperature, i.e. Rt=Rt0 [1+ α (t-t0)]；In formula, when Rt is temperature t
Resistance value；Rt0 corresponds to resistance value when being temperature t0 (usual t0=0 DEG C)；α is temperature coefficient.Industrial common metal fever resistance
From the point of view of resistance variation with temperature, most of metallic conductor has this property, but is not that can be used for thermometric thermal resistance,
Metal material as thermal resistance generally requires: temperature coefficient as big as possible and stable, resistivity are big (same sensitive
Spend the size of lower reduction sensor), there is stable Chemical Physics performance, the replicability of material within the temperature range of use
Good, resistance value, which varies with temperature, will a value function relationship (preferably in a linear relationship).
The resistance value and temperature relation of semiconductor thermistor are Rt=AeB/t；The resistance value that Rt is temperature in formula when being t；A,B
The constant of structure depending on semiconductor material.In comparison, the temperature coefficient of semiconductor thermistor is bigger, under room temperature
Resistance value is higher (usually more than thousands of Europe), but interchangeability is poor, and non-linear serious, temperature-measuring range only has -50-300 DEG C of a left sides
The right side is largely used to household electrical appliances and automobile temperature measurement and control, and metal fever resistance applies in general within the scope of -200-500 DEG C
Temperature measurement, its main feature is that measurement is accurate, stability is good, reliable performance, the application in Engineering Control is extremely extensive.
However, the temperature of especially satellite is adopted when carrying out temperature acquisition test in aerospace and related industrial fields
When collection test, when measurement end is tested using thermistor, it need to be carried out corresponding by really adjusting ambient temperature
Acquisition system test.
Such mode has the following deficiencies: that the test coverage of (1) thermistor is insufficient, and test environment often can not
Entire measurement condition, and a satellite or other aerospace equipments are covered, the temperature detecting resistance on several hundred roads is generally required, uses this
It is unpractical that kind mode, which carries out accurate, complete Temperature Quantity simulation,；(2) testing cost is high, needs true thermistor,
And external environment adjusting is complicated for operation, and Special experimental equipment is needed to be simulated, it is with high costs；(3) because of temperature ramp characteristic, outside
The temperature adjusting of portion's environment takes a long time, and the maintenance calibration of Special experimental equipment is bothersome laborious, causes testing efficiency low, surveys
It tries an operating condition and generally requires several days time.
Utility model content
For this purpose, the technical problem to be solved by the utility model is to provide a kind of temperature test coverage rate height, temperature test
The circuit of simulation thermistor at low cost, temperature test is high-efficient, especially, a kind of simulation temperature-sensitive for temperature simulation end
The circuit and its temperature measurement circuit of resistance.
The circuit of the simulation thermistor of the utility model, using thermistor plate as the output end of simulation thermistor,
The thermistor plate includes the first temperature-sensitive board, the second temperature-sensitive board；The first temperature-sensitive board and second thermal plate
Card is respectively two output ends of the simulation thermistor；
The first temperature-sensitive board is connect with first relay, the first contact of first relay and the first electricity
Resistance connection, the first resistor are connect with the second temperature-sensitive board；
Second contact of first relay is connect with the adjustable working cell of resistance value, the working cell with it is described
The connection of second temperature-sensitive board.
Preferably, the working cell includes: the second relay, the third contact of second relay and the second electricity
Resistance, the series connection of the first digital regulation resistance, the second resistance or first digital regulation resistance are connect with the second temperature-sensitive board；
4th contact of second relay is connect with the second digital regulation resistance, second digital regulation resistance with it is described
The connection of second temperature-sensitive board.
Preferably, the third contact of second relay is connect with the second resistance, the second resistance with it is described
The connection of first digital regulation resistance, first digital regulation resistance are connect with the second temperature-sensitive board.
Preferably, the first temperature-sensitive board, the second temperature-sensitive board are digital regulation resistance.
It is further preferred that the resistance value of the first temperature-sensitive board, the second temperature-sensitive board be 160 Ω~
250KΩ。
Preferably, the first resistor is the fixed resistance of resistance value；The resistance value of the first resistor is 1.6K Ω.
Preferably, the resistance value of the second resistance is 240k Ω.
Preferably, first digital regulation resistance, second digital regulation resistance are two digital regulation resistance series connection structures
At.
Preferably, first digital regulation resistance, second digital regulation resistance resistance value be 160 Ω~250K Ω.
The utility model also provides a kind of temperature measurement circuit, the circuit comprising the simulation thermistor.
The above-mentioned technical proposal of the utility model, has the advantage that compared with prior art
(1) circuit of simulation thermistor described in the utility model, can be tested at temperature simulation end, existing to replace
Have in technology using thermistor in such a way that measurement end is tested, and using digital regulation resistance substitution thermistor to measurement
End carries out function and performance test, is tested without true thermistor by really adjusting ambient temperature,
It is not necessary that ambient temperature is adjusted, the complexity of test operation is reduced, the maintenance school of Special experimental equipment is eliminated
Quasi- process substantially increases testing efficiency, and is not necessarily to the Special experimental equipment of thermistor, and testing cost is lower.Meanwhile it keeping away
The problem of test coverage for having exempted from true thermistor is insufficient, and test environment often can not cover entire measurement condition；
(2) circuit of simulation thermistor described in the utility model can meet the precision of the temperature acquisition test of satellite
It is required that point all acquisition one time all in each channel using the preceding circuit by the simulation thermistor, allowing will be adopted
The value collected is put into configuration file；To user in use, in configuration file search near setting value, guarantee can be maximized
Precision is set.And current temperature measuring equipment, thermistor, the stability of thermometric is inadequate, can not buy acquisition in the market
Precision meets temperature measuring equipment, the thermistor of the temperature acquisition testing requirement of satellite；
(3) circuit of simulation thermistor described in the utility model, using thermistor plate as simulation thermistor
Output end, the thermistor plate include the first temperature-sensitive board, the second temperature-sensitive board, the first temperature-sensitive board also with first after
Electric appliance connection, by the switching of first relay, it can be achieved that exporting fixed value and exporting cutting for adjustable two kinds of functions of resistance value
It changes, in the state of exporting adjustable resistance value, thermistor plate can be made to export specific resistance value during powering on, guarantee equipment under test shape
State is stablized；The resistance value of the first resistor is 1.6K Ω, and device power is defaulted as the resistance value of output 1.6K Ω, avoids powering on the phase
Between judge by accident and happen；
(4) circuit of simulation thermistor described in the utility model, first relay and includes digital regulation resistance
Working cell connection, the working cell includes the second relay, described second by the setting of relay, it can be achieved that defeated
Out in the state of adjustable resistance value, the adjusting of two Standard resistance ranges is realized by the switching of second relay；
(5) circuit of simulation thermistor described in the utility model, the third contact of second relay be suitable for
The second resistance connection, the second resistance are connect with first digital regulation resistance, first digital regulation resistance and institute
State the connection of the second temperature-sensitive board.4th contact of second relay is connect with the second digital regulation resistance, the number current potential
Device is connect with the second temperature-sensitive board.The resistance value of the first temperature-sensitive board is 160 Ω~250K Ω；Second temperature-sensitive
The resistance value of board is 160 Ω~250K Ω.It is possible thereby to which 160 Ω~250K is realized in the switching by second relay
The adjusting of Ω and 160 Ω~two Standard resistance ranges of 490K Ω；
First digital regulation resistance, second digital regulation resistance are that two digital regulation resistances are in series, series connection
Standard resistance range afterwards is 160 Ω~250K Ω, when required resistance value requires to be greater than 250K Ω, passes through second relay
When device switches to the first tip side, the second resistance is sealed in, the resistance value of the second resistance is 240K Ω；
(6) circuit of simulation thermistor described in the utility model can be used for analog satellite temperature-sensitive using CPCI structure
Resistance has interface electromagnetic isolation feature.The thermistor plate is to use two concatenated modes of precision digital potentiometer, simultaneous
Cared for the requirement of big output range and small step value, can accurate 72 tunnel of simulation output resistance value, function with higher
Density can be realized device miniaturization using this board, be easy to implement to several hundred roads needed for the aerospace equipments such as satellite
Temperature detecting resistance simulation.Wherein, the Standard resistance range of preceding 20 tunnel output is optional, can be switched by second relay
160 Ω~250K Ω and 160 Ω~the Standard resistance range of 490K Ω two, 160 Ω of Standard resistance range of only one default of rear 52 tunnel
~250K Ω.
Detailed description of the invention
Fig. 1 is the connection schematic diagram of the circuit of simulation thermistor provided by the embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model." first " hereinafter, " second " etc. are only used
In distinguishing in description, there is no other special meanings.
The first relay, the second relay used in the present embodiment is a kind of electric control device, is when input quantity (excitation
Amount) variation when reaching prescribed requirement, make controlled volume that a kind of electric appliance of scheduled Spline smoothing occur in electrical output circuit.
In the present embodiment, first relay, second relay are purchased from Xi'an Kai Yue Electronic Science and Technology Co., Ltd., model
The sealed direct-current electromagnetic relay of GJZC-1M/RG4.533.041G.
The first temperature-sensitive board, the second temperature-sensitive board used in the present embodiment is purchased from Shandong Hangtian Electronic Technology Institute,
The temperature detecting resistance analog board of model DMMS-CPCI-0D014, i.e. thermistor board.
It should be noted that each component of the utility model is also the above is only the source of the component used in the present embodiment
Can be used other commercially available conventional products, different manufacturers, model product have no effect on the implementation of technical solutions of the utility model
And the realization of technical effect.
The digital regulation resistance used in the present embodiment is the electricity that a kind of digital regulation resistance uses digital control scheme adjusting resistance value
Device element, is controlled by numeral input, generates the output of an analog quantity.In the present embodiment, digital regulation resistance is commercially available routine
Potentiometer.First resistor, the second resistance used in the present embodiment is commercially available conventional resistance.
Referring to Fig. 1, (1,2,3,4 respectively indicate the first contact of first relay, first relay in Fig. 1
Second contact, the third contact of second relay, second relay the 4th contact) shown in, the embodiment of the present invention
Simulation thermistor circuit, using thermistor plate as the output end for simulating thermistor, the thermistor plate includes
First temperature-sensitive board A, the second temperature-sensitive board B；The first temperature-sensitive board A and the second temperature-sensitive board B is respectively the mould
Two output ends of quasi- thermistor；In the present embodiment, the first temperature-sensitive board A, the second thermal plate B card are number
Potentiometer.The first temperature-sensitive board A, the second temperature-sensitive board B resistance value be 160 Ω~250K Ω.
The first temperature-sensitive board A is connect with the first relay K1, the first contact 1 of the first relay K1
It is connect with first resistor R1, the first resistor R1 is connect with the second temperature-sensitive board B.In the present embodiment, first electricity
Hindering R1 is the fixed resistance of resistance value；The resistance value of the first resistor R1 is 1.6K Ω.
The second contact 2 of the first relay K1 is connect with the adjustable working cell of resistance value, the working cell with
The second temperature-sensitive board B connection.
As the preferred implementation of the present embodiment, the working cell includes: the second relay K2, second relay
The third contact 3 of device K2 is connected with second resistance R2, the first digital regulation resistance R3, first number of second resistance R2 or described
Potentiometer R3 is connect with the second temperature-sensitive board B.It should be noted that the third contact 3 and second resistance R2, the first number
Word potentiometer R3 series system is not unique, in the present embodiment, the third contact 3 of the second relay K2 and second electricity
Hinder R2 connection, the second resistance R2 connect with the first digital regulation resistance R3, the first digital regulation resistance R3 with it is described
Second temperature-sensitive board B connection.In the present embodiment, the resistance value of the second resistance R2 is 240k Ω.
The 4th contact 4 of the second relay K2 is connect with the second digital regulation resistance R4, second digital regulation resistance
R4 is connect with the second temperature-sensitive board B.
As the specific implementation of the present embodiment, the first digital regulation resistance R3, the second digital regulation resistance R4
It is that two digital regulation resistances are in series.The resistance value of the first digital regulation resistance R3, the second digital regulation resistance R4
For 160 Ω~250K Ω.
The circuit of thermistor is simulated described in the present embodiment, the course of work is as follows: with the first temperature-sensitive board A,
Second temperature-sensitive board B as simulation thermistor output end, connect respectively with the output end at temperature simulation end, described first after
Electric appliance K1 the first contact 1 connection when, with resistance value be fixed value the first resistor R1 connect, and with second temperature-sensitive
The resistance value of board B connection, the circuit output of the entire simulation thermistor is fixed value, wherein the first resistor
R1 is 1.6K Ω；
When the second contact 2 connection of the first relay K1, it is connected to the adjustable working cell of resistance value；It is specific and
Speech is connected to when the connection of the third contact 3 of the second relay K2 with the second resistance R2 that resistance value is fixed value, and
The second resistance R2 is connected to the adjustable first digital regulation resistance R3 of resistance value, the first digital regulation resistance R3 and institute
The second temperature-sensitive board B connection is stated, the resistance value of the circuit output of the entire simulation thermistor is adjustable value, 160
It is optional in the Standard resistance range of Ω~490K Ω, wherein the resistance value of the second resistance R2 is 240k Ω, the first number electricity
The resistance value of position device is 160 Ω~250K Ω；
When the connection of the 4th contact 4 of the second relay K2, with adjustable second digital regulation resistance of resistance value
R4 connection, the second digital regulation resistance R4 are connected to the second temperature-sensitive board B, the electricity of the entire simulation thermistor
The resistance value of road output is adjustable value, optional in 160 Ω~250K Ω Standard resistance range, wherein the first number electricity
The resistance value of position device is 160 Ω~250K Ω.
By above-mentioned regulative mode, can accurate 72 tunnel of simulation output resistance value, be easy to implement and navigate to aviations such as satellites
The simulation of the temperature detecting resistance on several hundred roads needed for its equipment.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes among the protection scope created still in the utility model.
Claims (10)
1. a kind of circuit for simulating thermistor, which is characterized in that using thermistor plate as the output end of simulation thermistor,
The thermistor plate includes the first temperature-sensitive board, the second temperature-sensitive board；The first temperature-sensitive board and second thermal plate
Card is respectively two output ends of the simulation thermistor；
The first temperature-sensitive board is connect with the first relay, and the first contact of first relay is connect with first resistor,
The first resistor is connect with the second temperature-sensitive board；
Second contact of first relay is connect with the adjustable working cell of resistance value, the working cell and described second
The connection of temperature-sensitive board.
2. the circuit of simulation thermistor according to claim 1, which is characterized in that the working cell includes: second
The third contact of relay, second relay is connected with second resistance, the first digital regulation resistance, the second resistance or institute
The first digital regulation resistance is stated to connect with the second temperature-sensitive board；
4th contact of second relay is connect with the second digital regulation resistance, second digital regulation resistance and described second
The connection of temperature-sensitive board.
3. the circuit of simulation thermistor according to claim 2, which is characterized in that the third of second relay is touched
Point is connect with the second resistance, and the second resistance is connect with first digital regulation resistance, first digital regulation resistance
It is connect with the second temperature-sensitive board.
4. the circuit of simulation thermistor according to claim 1, which is characterized in that the first temperature-sensitive board, described
Second temperature-sensitive board is digital regulation resistance.
5. the circuit of simulation thermistor according to claim 4, which is characterized in that the first temperature-sensitive board, described
The resistance value of second temperature-sensitive board is 160 Ω~250K Ω.
6. the circuit of simulation thermistor according to claim 1, which is characterized in that the first resistor is solid for resistance value
Fixed resistance；The resistance value of the first resistor is 1.6K Ω.
7. the circuit of simulation thermistor according to claim 2, which is characterized in that the resistance value of the second resistance is
240kΩ。
8. the circuit of simulation thermistor according to claim 2, which is characterized in that first digital regulation resistance, institute
Stating the second digital regulation resistance is that two digital regulation resistances are in series.
9. the circuit of simulation thermistor according to claim 8, which is characterized in that first digital regulation resistance, institute
The resistance value for stating the second digital regulation resistance is 160 Ω~250K Ω.
10. a kind of temperature measurement circuit, which is characterized in that include simulation thermistor described in any one of claim 1-9
Circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821531500.8U CN209055244U (en) | 2018-09-17 | 2018-09-17 | A kind of circuit and its temperature measurement circuit for simulating thermistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821531500.8U CN209055244U (en) | 2018-09-17 | 2018-09-17 | A kind of circuit and its temperature measurement circuit for simulating thermistor |
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| CN209055244U true CN209055244U (en) | 2019-07-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799346A (en) * | 2020-12-30 | 2021-05-14 | 浙江工业大学 | Program-controlled thermistor simulator and resistor simulation method |
-
2018
- 2018-09-17 CN CN201821531500.8U patent/CN209055244U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799346A (en) * | 2020-12-30 | 2021-05-14 | 浙江工业大学 | Program-controlled thermistor simulator and resistor simulation method |
| CN112799346B (en) * | 2020-12-30 | 2022-04-29 | 浙江工业大学 | Program-controlled thermistor simulator and resistor simulation method |
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