CN105277292A - Temperature measurement device - Google Patents
Temperature measurement device Download PDFInfo
- Publication number
- CN105277292A CN105277292A CN201410354440.7A CN201410354440A CN105277292A CN 105277292 A CN105277292 A CN 105277292A CN 201410354440 A CN201410354440 A CN 201410354440A CN 105277292 A CN105277292 A CN 105277292A
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- Prior art keywords
- voltage
- signal
- temperature
- operational amplifier
- current signal
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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
- G01K7/22—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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention provides a temperature measurement device. The temperature measurement device comprises a current type temperature sensor for outputting a fist current signal corresponding to temperature, a thermistor type temperature sensor for outputting a second current signal corresponding to temperature, a voltage-dividing resistor which is connected with a thermistor in the thermistor type temperature sensor in series and used to control a voltage of the second current signal to be in a voltage interval of the first current signal, a voltage sampling resistor for converting the first current signal into a first voltage signal or converting the second current signal into a second voltage signal, and an AD converter for converting the first voltage signal into a first digital signal or converting the second voltage signal into a second digital signal. The temperature measurement device can be compatible for the current type temperature sensor and the thermistor type temperature sensor through the simple circuit structure, so more measurement selections is provided for a user in low cost.
Description
Technical field
The present invention relates to thermal measurement arts, particularly a kind of temperature measuring equipment.
Background technology
At present, mainly contain two kinds for thermometric sensor, i.e. ic temperature transducer and thermistor type temperature sensor, both all can export the electrical quantity becoming corresponding relation with temperature.Ic temperature transducer to the measurement of temperature more fast, more accurate.Thermistor type temperature sensing then has much bigger temperature-coefficient of electrical resistance value, can measure small temperature variation.Therefore, there is demand to be worth and go to develop a kind of temperature measuring equipment being furnished with ic temperature transducer and thermistor type temperature sensor.
But ic temperature transducer needs higher operating voltage, and the electrical quantity that its electrical quantity exported and thermistor type temperature sensor export has very large otherness, therefore, consider from cost angle, studying a kind ofly the circuit arrangement of both compatibilities can become current problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of temperature measuring equipment, can by the compatible ic temperature transducer of simple circuit structure and thermistor type temperature sensor.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of temperature measuring equipment, comprising:
Ic temperature transducer, for exporting first current signal corresponding with temperature; Thermistor type temperature sensor, for exporting second current signal corresponding with temperature;
Divider resistance, connects with the thermistor in described thermistor type temperature sensor, for by the Control of Voltage of described second current signal in the voltage range of described first current signal;
Voltage sample resistance, for being converted to the first voltage signal or described second current signal being converted to the second voltage signal by described first current signal;
AD converter, for being converted to the first digital signal by described first voltage signal or the second voltage signal being converted to the second digital signal.
Wherein, described temperature measuring equipment also comprises:
First operational amplifier, is connected between described sampling resistor and AD converter, for amplifying described first voltage signal or the second voltage signal.
Wherein, described temperature measuring equipment also comprises:
For regulating the first regulating resistance and second regulating resistance of described first operational amplifier enlargement factor;
One end ground voltage of described first regulating resistance, the reverse input end of the first operational amplifier described in another termination;
One end of described second regulating resistance is connected with the reverse input end of described first operational amplifier, the output terminal of the first operational amplifier described in another termination.
Wherein, described temperature measuring equipment also comprises:
Voltage follower, is connected between described sampling resistor and the first opamp input terminal, affects the dividing potential drop of described sampling resistor for reducing described operational amplifier.
Wherein, described voltage sample resistance one end ground voltage, the other end is connected with the output terminal of described ic temperature transducer and described thermistor type temperature sensor respectively.
Wherein, described voltage follower is the second operational amplifier of being connected with output terminal of negative input specifically, its positive input is connected with the described other end of described voltage sample resistance, for accessing described first voltage signal or described second voltage signal, its output terminal is connected with the input end of described first operational amplifier.
The beneficial effect of technique scheme of the present invention is as follows:
Temperature measuring equipment of the present invention by the compatible ic temperature transducer of simple circuit structure and thermistor type temperature sensor, thus more can measure selection with lower cost for user provides, and has very high practical value.
Accompanying drawing explanation
Fig. 1 is the structural representation of temperature measuring equipment of the present invention;
Fig. 2 is the structural representation of existing ic temperature transducer;
Fig. 3 is the structural representation of existing thermistor type temperature sensor.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 1, embodiments of the invention provide a kind of temperature measuring equipment, comprising:
Ic temperature transducer, for exporting first current signal corresponding with temperature; Thermistor type temperature sensor, for exporting second current signal corresponding with temperature;
Divider resistance, connects with the thermistor in described thermistor type temperature sensor, for by the Control of Voltage of described second current signal in the voltage range of described first current signal;
Voltage sample resistance, for being converted to the first voltage signal or described second current signal being converted to the second voltage signal by described first current signal;
AD converter, for being converted to the first digital signal by described first voltage signal or the second voltage signal being converted to the second digital signal.
The Current Control of the second current signal that thermistor type temperature sensor S1 is exported by divider resistance R2 by the temperature measuring equipment of the present embodiment in the preset range identical with the first current signal that ic temperature transducer S2 exports, thus can adopt a compatible circuit to get final product the digital conversion process of the first current signal and the second current signal.
Wherein, sampling resistor R1 one end ground voltage, the other end is connected with the output terminal of ic temperature transducer S2 and thermistor type temperature sensor S1, the voltage swing of sample the first current signal and the second current signal.
Particularly, on above-described embodiment basis, as shown in Figure 1, first operational amplifier A 1 can be set, be connected between described sampling resistor R1 and AD converter, the first voltage signal on described sampling resistor R1 or the second voltage signal are amplified, the voltage swing of the first voltage signal or the second voltage signal is reached in the working range of AD converter ADC.
In the present embodiment, the enlargement factor of the first operational amplifier A 1 is regulated by the first regulating resistance R4 and the second regulating resistance R5.Wherein, as shown in Figure 1, one end ground voltage of the first regulating resistance R4, the reverse input end of another termination first operational amplifier A 1; One end of second regulating resistance R5 is connected with the reverse input end of the first operational amplifier A 1, the output terminal of another termination first operational amplifier A 1.This cut-in method can make the enlargement factor=1+R5/R4 of the first operational amplifier A 1.Exemplarily, if want the voltage amplification 3 times by the first voltage signal or the second voltage signal, then R5=2*R4 is set.If think amplification 6 times, then R5=5*R4 is set.
In addition, on the basis of above-described embodiment, a voltage follower also can be set, be connected between sampling resistor R1 and the first operational amplifier A 1 input end, by voltage follower to improve the carrying load ability of circuit, reduce the dividing potential drop impact that the first operational amplifier A 1 causes R1, and then reduce the error to temperature detection.Particularly, as shown in Figure 1, second operational amplifier A 2 that reverse input end can be used to be connected with output terminal is as voltage follower.Its positive input is connected with the described other end of described voltage sample resistance R1, and for accessing described first voltage signal or described second voltage signal, its output terminal is connected with the input end of described first operational amplifier A 1.In addition, also can arrange a resistance R3 between A1 and A2, the electrical quantity exported for regulating A2, its resistance is arranged according to the actual requirements.
Below for ic temperature transducer common at present and thermistor temperature sensor, application of the present invention is described in detail.
In the present embodiment, the model of ic temperature transducer S2 is AD590.The parameter of thermistor type temperature sensor S1 is R25=10K Ω, B25/85=3435K, namely 25 DEG C time, thermistor Rt=10K Ω, its resistance is 3435K to the susceptibility of temperature.
AD590 is Two-port netwerk integrated temperature converting means output current ratio being converted to absolute temperature.In the equipment of supply voltage between+4V to+30V, can be used as a high impedance, steady current is the device of 1uA/K.By the laser trimming thin film resistor of chip internal, equipment can be finely tuned and extremely export 298.2uA electric current when 298.2K (+25 DEG C).In addition, AD590 is PTAT (being proportional to an absolute temperature) current regulator.Its output current is directly proportional to Kelvin temperature.Fig. 2 is the inner structure schematic diagram of AD590, it converts electric current to voltage by a resistance, when 5V powers, minimum operating voltage due to AD590 is 4V, so can not more than 1V at this ohmically voltage, suppose that the temperature range expecting to detect is-40 DEG C to 100 DEG C (233K-373K), the electric current that so AD590 is corresponding is 233uA-373uA.As resistance in Fig. 2=2k Ω, the voltage range of the first current signal of output is: 0.466-0.746V.
Fig. 3 is the inner structure schematic diagram of thermistor type temperature sensor S1, and it converts electric current to voltage by the resistance of an a thermistor Rt and 2k Ω.When 5V powers, the computing formula of the voltage of its second current signal exported is V=5V*R2/ (Rt+R2).According to the resistance value of thermistor and the relation of temperature: R=X*e
y/Tit is known that (X, Y are the constants relevant with semiconductor material, T is absolute temperature), when temperature range-40 DEG C is to 100 DEG C, the variation range of thermistor Rt is 192k-1k, and the voltage range of the second current signal of output is: 0.010V-1.667V.
Can be known by contrast, the voltage range difference that the current signal of two sensor signal outputs is corresponding is larger, therefore can not be consistent during signalization Circuit tuning.For this reason, the method that the present invention solves is that the divider resistance R2 being 0.1% by a precision connects with thermistor Rt, makes the total value of resistance be changed to 202k-11k by original 192k-1k.Voltage=the 5V*R1/ (Rt+R1+R2) of the second current signal can be released by above-mentioned computing formula.When temperature range is-40 DEG C to 100 DEG C, the voltage exporting the second current signal is: 0.049V-0.769V, roughly the same with the voltage range 0.466-0.746V of the first current signal that AD590 exports, and all belongs within 0.049V-0.769V scope.Therefore, same first operational amplifier A 1 can be used to carry out voltage amplification, and complete digital conversion on ADC, generate the digital signal that microprocessor can identify.
When using temperature measuring equipment of the present invention, first be connected with processor, by the ADC output terminal access processor in Fig. 1, user can select to be use ic temperature transducer or use thermistor type temperature sensor measuring tempeature according to the demand of oneself afterwards.And on processor machine, set the mode of operation corresponding to temperature sensor selected.Such as when using thermistor type temperature sensor measuring tempeature, can the mode of operation of the corresponding thermistor type temperature sensor of placement processor machine, processor, after the digital signal receiving ADC output, can calculate temperature to be measured according to the temperature algorithm of thermistor type temperature sensor.
After above-mentioned configuration completes, the temperature sensor of choice for use is energized, and is arranged on object under test and can carries out temperature survey.Particularly, may correspond to two temperature sensors and a power interface is set respectively for cut-in operation power supply, in use, need which temperature sensor work just cut-in operation power supply on the power interface which temperature sensor is corresponding.In addition, can be known by foregoing description, the operating voltage of two temperature sensors is consistent, and therefore temperature measuring equipment of the present invention also only can arrange a power interface, and controls which temperature sensor of working power selection inflow by switch.
Visible, temperature measuring equipment of the present invention just can apply two kinds of temperature sensors by the simple circuit structure shown in Fig. 1, more can measure selection, have very high practical value with lower cost for user provides.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a temperature measuring equipment, is characterized in that, comprising:
Ic temperature transducer, for exporting first current signal corresponding with temperature; Thermistor type temperature sensor, for exporting second current signal corresponding with temperature;
Divider resistance, connects with the thermistor in described thermistor type temperature sensor, for by the Control of Voltage of described second current signal in the voltage range of described first current signal;
Voltage sample resistance, for being converted to the first voltage signal or described second current signal being converted to the second voltage signal by described first current signal;
AD converter, for being converted to the first digital signal by described first voltage signal or the second voltage signal being converted to the second digital signal.
2. temperature measuring equipment according to claim 1, is characterized in that, comprising:
First operational amplifier, is connected between described sampling resistor and AD converter, for amplifying described first voltage signal or the second voltage signal.
3. temperature measuring equipment according to claim 2, is characterized in that, comprising:
For regulating the first regulating resistance and second regulating resistance of described first operational amplifier enlargement factor;
One end ground voltage of described first regulating resistance, the reverse input end of the first operational amplifier described in another termination;
One end of described second regulating resistance is connected with the reverse input end of described first operational amplifier, the output terminal of the first operational amplifier described in another termination.
4. temperature measuring equipment according to claim 2, is characterized in that, comprising:
Voltage follower, is connected between described sampling resistor and the first opamp input terminal, affects the dividing potential drop of described sampling resistor for reducing described operational amplifier.
5. temperature measuring equipment according to claim 4, is characterized in that,
Described voltage sample resistance one end ground voltage, the other end is connected with the output terminal of described ic temperature transducer and described thermistor type temperature sensor respectively.
6. temperature measuring equipment according to claim 4, is characterized in that,
Described voltage follower is the second operational amplifier of being connected with output terminal of negative input specifically, its positive input is connected with the described other end of described voltage sample resistance, for accessing described first voltage signal or described second voltage signal, its output terminal is connected with the input end of described first operational amplifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410354440.7A CN105277292A (en) | 2014-07-23 | 2014-07-23 | Temperature measurement device |
| PCT/CN2014/090828 WO2015131539A1 (en) | 2014-07-23 | 2014-11-11 | Temperature measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410354440.7A CN105277292A (en) | 2014-07-23 | 2014-07-23 | Temperature measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105277292A true CN105277292A (en) | 2016-01-27 |
Family
ID=54054428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410354440.7A Withdrawn CN105277292A (en) | 2014-07-23 | 2014-07-23 | Temperature measurement device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105277292A (en) |
| WO (1) | WO2015131539A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112050969A (en) * | 2019-06-07 | 2020-12-08 | 株式会社村田制作所 | Temperature detection circuit and module |
| CN118583313A (en) * | 2024-08-07 | 2024-09-03 | 深圳市永联科技股份有限公司 | Temperature sampling multiplexing circuit and method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110750116B (en) * | 2019-11-25 | 2024-07-16 | 武汉科技大学 | Temperature interval control circuit and electronic equipment |
| CN112306120B (en) * | 2020-10-20 | 2022-01-04 | 武汉智能装备工业技术研究院有限公司 | Temperature control system |
| CN112729587A (en) * | 2020-12-15 | 2021-04-30 | 珠海格力电器股份有限公司 | Temperature detection circuit, refrigerator and temperature detection method |
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| CN201909684U (en) * | 2011-01-18 | 2011-07-27 | 浙江恒强科技有限公司 | Temperature measuring circuit |
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| CN203216626U (en) * | 2012-12-30 | 2013-09-25 | 黑龙江工程学院 | AD 590 temperature measurement circuit using operational amplifier virtual ground technology |
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- 2014-07-23 CN CN201410354440.7A patent/CN105277292A/en not_active Withdrawn
- 2014-11-11 WO PCT/CN2014/090828 patent/WO2015131539A1/en active Application Filing
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112050969A (en) * | 2019-06-07 | 2020-12-08 | 株式会社村田制作所 | Temperature detection circuit and module |
| CN118583313A (en) * | 2024-08-07 | 2024-09-03 | 深圳市永联科技股份有限公司 | Temperature sampling multiplexing circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015131539A1 (en) | 2015-09-11 |
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Application publication date: 20160127 |
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