CN109357778A - Temperature-detecting device - Google Patents
Temperature-detecting device Download PDFInfo
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- CN109357778A CN109357778A CN201811572038.0A CN201811572038A CN109357778A CN 109357778 A CN109357778 A CN 109357778A CN 201811572038 A CN201811572038 A CN 201811572038A CN 109357778 A CN109357778 A CN 109357778A
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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 provides a kind of temperature-detecting device, comprising: temperature sensor input unit；Voltage amplification module, input terminal are connect with the temperature sensor input unit, for amplifying the detectable voltage signals of the temperature sensor input unit to obtain amplified signal；Integration module connect to obtain the amplified signal of the voltage amplification module output with the output end of the voltage amplification module, and carries out integral operation to the amplified signal；Voltage comparison module is connected with the integration module and is compared with the integral voltage exported after the integral operation by the integration module with predeterminated voltage, and exports comparison result signal according to comparison result；Central processing module is connect with the voltage comparison module, and the central processing module is used to calculate the temperature value of corresponding thermocouples detection according to the comparison result signal.
Description
Technical field
The present invention relates to temperature detection fields, and in particular to a kind of temperature-detecting device.
Background technique
In the prior art, temperature detection is mostly using thermistor come temperature sensor variation, and passes through sensing temperature-sensitive
Ohmically voltage change realizes temperature detection.
But the detection sensitivity of temperature-detecting device in the prior art is lower, can not detect that lesser temperature becomes
Change, moreover, circuit structure is complicated, higher cost.
Therefore, the prior art is defective, needs to improve.
Summary of the invention
The object of the present invention is to provide a kind of temperature-detecting devices, have raising detection accuracy and reduce having for cost
Beneficial effect.
The embodiment of the invention provides a kind of temperature-detecting devices, comprising:
Temperature sensor input unit, for accessing thermocouple；
Voltage amplification module, input terminal are connect with the temperature sensor input unit, for the temperature sensor is defeated
The detectable voltage signals for entering unit are amplified to obtain amplified signal；
Integration module is connect to obtain the amplification of the voltage amplification module output with the output end of the voltage amplification module
Signal, and integral operation is carried out to the amplified signal；
Voltage comparison module connect the integral voltage to export after the integral operation by the integration module with the integration module
It is compared with predeterminated voltage, and comparison result signal is exported according to comparison result；
Central processing module is connect with the voltage comparison module, and the central processing module is used to relatively be tied according to described
Fruit signal calculates the temperature value of corresponding thermocouples detection.
In temperature-detecting device of the present invention, the central processing module is used for according to the comparison result signal
In duration of predetermined level calculate the temperature value.
In temperature-detecting device of the present invention, the integration module includes that the first gating switch and integral are single
Member, first gating switch are connect with the integral unit, the control of the central processing module and first gating switch
End connection processed is switched between integration phase and discharge regime with controlling the integral unit by first gating unit.
In temperature-detecting device of the present invention, the integral unit includes capacitor C23, resistance R20 and first
Operational amplifier；
The inverting input terminal of first operational amplifier respectively with the first end of the capacitor C23 and the resistance R20
The normal phase input end of first end connection, first operational amplifier accesses the first reference voltage, first operational amplifier
Output end connect respectively with the second end of the voltage comparison module and the capacitor C23, first gating switch
Port Z is connect with the second end of the capacitor C23, the first end of the port Z1 of first gating switch and the capacitor C23
Connection, the port x of first gating switch are connect with the second end of the resistance R20, and the one of first gating switch is defeated
Enter end to connect with the output end of the voltage amplification module；
The central processing module is connect with the control terminal of first gating switch, is being integrated with controlling the integration module
Switch between stage and discharge regime.
In temperature-detecting device of the present invention, in integration phase, first gating switch by port Z and
It is isolated between the Z1 of port, the input terminal of control module connection and the port x is connected, capacitor C23, resistance R20 and first
Operational amplifier constitutes integral unit and charges to capacitor C23；
In discharge regime, first gating switch is by port Z and port Z1 connection, to discharge capacitor C23.
In temperature-detecting device of the present invention, the voltage comparison module includes second operational amplifier；
The inverting input terminal of the second operational amplifier is connect with the output end of first operational amplifier；
The normal phase input end of the second operational amplifier also accesses the first reference voltage.
It further include latch in temperature-detecting device of the present invention, the output end of the second operational amplifier
It is connect with an input terminal of the latch, the output end of the latch and another input terminal and the central processing module
Connection.
In temperature-detecting device of the present invention, the integral unit further includes that reference voltage provides unit, the base
Quasi- voltage providing unit is used to provide preset reference voltage to the normal phase input end of first operational amplifier；
It includes reference voltage chip U2, resistance R12, resistance R26, resistance R10, capacitor C20, capacitor that the reference voltage, which provides unit,
C13, resistance R16 and resistance R17；Resistance R12, resistance R26, resistance R10 are sequentially connected, separate resistance of resistance R12
Predeterminated voltage, the common node company of the cathode of the reference voltage chip and resistance R12 and resistance R26 are accessed in one end of R26
It connects, the anode of reference voltage chip U2 is connect with one end far from resistance R26 of resistance R10, reference voltage chip U2
Control electrode connect with the common node of resistance R26 and resistance R10, the both ends of capacitor C20 respectively with the reference voltage
The cathode and anode of chip U2 connect, the both ends of the capacitor C13 cathode and anode with reference voltage chip U2 respectively
Connection, one end of resistance R16 are connect with one end of capacitor C13, and the other end of resistance R16 is connect with one end of resistance R17, electricity
Hinder the other end of R17 and the other end connect and ground of capacitor C13, the common node of resistance R16 and resistance R17 with should
The normal phase input end of first operational amplifier F2 connects.
In temperature-detecting device of the present invention, the temperature sensor input unit includes resistance R1, resistance R6
And capacitor C1；
The both ends of the thermocouple are connect with the both ends of the resistance R6 respectively, and predeterminated voltage is accessed in one end of the resistance R1,
The other end of the resistance R1 is connect with one end of the resistance R6, one end of the other end of the resistance R6 and the capacitor C1
Connection, the other end ground connection of the capacitor C1；The voltage of the common node of the resistance R6 and the capacitor C1 is the inspection
Survey voltage signal.
In temperature-detecting device of the present invention, the central processing module is inputted with the temperature sensor respectively
The common node of the resistance R1 and resistance R6 of unit are connected to detect whether corresponding thermocouples have in connection.
The present invention is connect by providing integration module with the output end of the voltage amplification module to obtain the voltage
The amplified signal of amplification module output, and integral operation is carried out to the amplified signal；Voltage comparison module, with the integral mould
Block connection is compared with the integral voltage exported after the integral operation by the integration module with predeterminated voltage, and is tied according to comparing
Fruit exports comparison result signal；Central processing module is connect with the voltage comparison module, and the central processing module is used for
The temperature value of corresponding thermocouples detection is calculated according to the comparison result signal；Temperature detection sensitivity is improved to have
Beneficial effect, and cost can be reduced.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of the temperature-detecting device in some embodiments of the invention.
Fig. 2 is a kind of circuit structure diagram of the temperature-detecting device in some embodiments of the invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with spy
Fixed orientation construction and operation, therefore be not considered as limiting the invention.In addition, term " first ", " second " are only used for
Purpose is described, relative importance is not understood to indicate or imply or implicitly indicates the quantity of indicated technical characteristic.
" first " is defined as a result, the feature of " second " can explicitly or implicitly include one or more feature.?
In description of the invention, the meaning of " plurality " is two or more, unless otherwise specifically defined.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected or can mutually communicate；It can be directly connected, it can also be by between intermediary
It connects connected, can be the connection inside two elements or the interaction relationship of two elements.For the ordinary skill of this field
For personnel, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.In order to
Simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
And it is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter,
This repetition is for purposes of simplicity and clarity, itself not indicate between discussed various embodiments and/or setting
Relationship.In addition, the present invention provides various specific techniques and material example, but those of ordinary skill in the art can be with
Recognize the application of other techniques and/or the use of other materials.
Fig. 1 is please referred to, Fig. 1 is the structural schematic diagram of the temperature-detecting device in one embodiment of the invention, the temperature detection
Device, comprising: at least two temperature sensor input units 10, signal amplification module 30, integration module 40, voltage comparison module
50 and central processing module 60.
Wherein, in the present embodiment, temperature sensor input unit 10 is used to access thermocouple, detects temperature and generates
Corresponding detectable voltage signals.The input terminal of signal amplification module 30 is connect with the output end of temperature sensor input unit 10,
For amplifying the detectable voltage signals of temperature sensor input unit 10 to obtain amplified signal；Integration module 40 and the letter
The output end connection of number amplification module 30 is to obtain the amplified signal that the signal amplification module 30 exports, and to the amplified signal
Carry out integral operation；Voltage comparison module 50 is connect with will be defeated after the integral operation of the integration module 40 with the integration module 40
Integral voltage out is compared with predeterminated voltage, and according to comparison result outputs level signals；Central processing module 60 and institute
The connection of voltage comparison module 50 is stated, the central processing module 60 is used to obtain corresponding thermocouples detection according to the level signal
Temperature value, the duration of the high level in level signal specially exported according to voltage comparison module 50 calculate corresponding heat
The temperature value of galvanic couple detection.Referring to Fig. 2, which uses single-chip microcontroller, model AT89S51RT2,
The single-chip microcontroller or micro-chip processor of other models can certainly be used.Central processing module 60 that is to say single-chip microcontroller
AT89S51RT2 is connect respectively to detect pair with the common node of the resistance R1 of temperature sensor input unit 10 and resistance R6
Answer whether thermocouple has in connection.
Specifically, temperature sensor input unit 10 includes resistance R1, resistance R6 and capacitor C1；The both ends of thermocouple point
It is not connect with the both ends of resistance R6, such as the terminal K11 and K12 in figure are connect with the both ends of a thermocouple respectively.The resistance
Predeterminated voltage is accessed in one end of R1, such as 2.5V, the other end of the resistance R1 are connect with one end of the resistance R6, the electricity
The other end of resistance R6 is connect with one end of the capacitor C1, the other end ground connection of the capacitor C1；The resistance R6 and described
The voltage of the common node of capacitor C1 is the detectable voltage signals.Also, one end that the thermocouple of access is connect with capacitor C1
Also it that is to say that chip processor AT89S51 RT2 is connect with the central processing module 60.Specifically, terminal K12 and single-chip microcontroller in figure
The port P00 connection of AT89S51RT2.
The signal amplification module 30 can be realized using normal signal amplifying circuit in the prior art, and this will not be repeated here.
Temperature sensor input unit 10 can use thermocouple input unit.It that is to say, temperature sensor can use
Thermocouple.
In some embodiments, which includes the first gating chip U6 and integral unit, first choosing
Obturator piece U6 is connect with the integral unit, the central processing module 60 with it is described first gating chip control terminal connect with
The integral unit is controlled by the first gating unit U6 to switch between integration phase and discharge regime.
Specifically, which includes capacitor C23, resistance R20 and the first operational amplifier F2；First operation amplifier
The inverting input terminal of device F2 is connect with the first end of the first end of the capacitor C23 and the resistance R20 respectively, and described first
The normal phase input end of operational amplifier F2 accesses the first reference voltage, the output end of the first operational amplifier F2 respectively with institute
State voltage comparison module 50 and the second end connection of the capacitor C23, the port Z and the electricity of the first gating chip F2
Holding the second end connection of C23, the port Z1 of the first gating chip F2 is connect with the first end of the capacitor C23, and described the
One gating chip F2 port x connect with the second end of the resistance R20, it is described first gate chip an input terminal with it is described
The output end of signal amplification module 30 connects；The control terminal of the central processing module 60 and the first gating chip U6 connects
It connects, is switched between integration phase and discharge regime with controlling the integration module 40.
Wherein, which further includes that a reference voltage provides unit, the reference voltage provide unit be used for this
The normal phase input end of one operational amplifier F2 provides preset stable reference voltage.It includes benchmark that the reference voltage, which provides unit,
Voltage chips U2, resistance R12, resistance R26, resistance R10, capacitor C20, capacitor C13, resistance R16 and resistance R17.Wherein, should
Resistance R12, resistance R26, resistance R10 are sequentially connected, and predeterminated voltage is accessed in one end far from resistance R26 of resistance R12, such as
The cathode of 5V, reference voltage chip U2 are connect with the common node of resistance R12 and resistance R26, the reference voltage chip
The anode of U2 is connect with one end far from resistance R26 of resistance R10, the control electrode and the resistance of reference voltage chip U2
The common node of R26 and resistance R10 connection, the both ends of the capacitor C20 respectively with the cathode of reference voltage chip U2 and
Anode connection, the both ends of capacitor C13 are connect with the cathode of reference voltage chip U2 and anode respectively, and the one of resistance R16
End connect with one end of capacitor C13, the other end of resistance R16 is connect with one end of resistance R17, the other end of resistance R17 and
The common node of the other end connect and ground of capacitor C13, resistance R16 and resistance R17 and first operational amplifier
The normal phase input end of F2 is connected to give the normal phase input end of first operational amplifier F2 to provide stable reference voltage.Benchmark electricity
TL431 or three terminal regulator can be used in pressure chip U2.
In integration phase, the central processing module 60 that is to say chip processor AT89S51 RT2 by port P15, P16 with
And P17 sends control signal to port A, port B and the port C of first gating chip U6, so that the first gating chip
U6 will be isolated between port Z and port Z1 and hanging, the input terminal that signal amplification module 30 is connected and port x connection,
It that is to say and connect the port x 1 of port first gating chip U6 and the port x, capacitor C23, resistance R20 and the first fortune
Amplifier F2 is calculated to constitute integral unit and charge to capacitor C23.
In discharge regime, the central processing module 60 that is to say chip processor AT89S51 RT2 by port P15, P16 with
And P17 sends control signal to port A, port B and the port C of first gating chip U6, so that the first gating chip U6
By port Z and port Z1 connection, to discharge capacitor C23.
Wherein, which includes second operational amplifier F3, capacitor C15 and capacitor C18；Described second
The inverting input terminal of operational amplifier F3 is connect with the output end of the first operational amplifier F2, the second operational amplifier
The normal phase input end of F3 is connect with one end of one end of the capacitor C15 and capacitor C18 respectively, and the capacitor C15's is another
The other end of end and capacitor C18 ground connection；The normal phase input end of second operational amplifier F3 also accesses the first reference voltage.
In some embodiments, which further includes including latch F4 and resistance R27, second fortune
The output end for calculating amplifier F3 is connect with one end of the resistance R27, and the other end of the resistance R27 is with the latch F4's
The connection of one input terminal, the output end and another input terminal of the latch F4 are connect with the central processing module 60, specifically
To be connect with the port P16 of the central processing module 60.
Specific workflow: in integration phase, which that is to say that chip processor AT89S51 RT2 passes through
Port P15, P16 and P17 send control signal to port A, port B and the port C of first gating chip U6, so that should
First gating chip U6 will isolation and hanging between port Z and port Z1, input terminal that signal amplification module 30 is connected with
The port x is connected, and be that is to say and is connected the port x 1 of port first gating chip U6 and the port x, capacitor C23, resistance
R20 and the first operational amplifier F2 constitutes integral unit and charges to capacitor C23.
When discharge regime, the central processing module 60 that is to say chip processor AT89S51 RT2 by port P15, P16 and
P17 sends control signal to port A, port B and the port C of first gating chip U6, so that the first gating chip U6 will
Port Z and port Z1 connection, to discharge capacitor C23.
In the description of this specification, reference term " embodiment ", " certain embodiments ", " schematically implementation
What the description of mode ", " example ", " specific example " or " some examples " etc. meant to describe in conjunction with the embodiment or example
Particular features, structures, materials, or characteristics are contained at least one embodiment or example of the invention.In this specification
In, schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, the specific spy of description
Sign, structure, material or feature can be combined in any suitable manner in any one or more embodiments or example.
In conclusion although the present invention has been disclosed above in the preferred embodiment, but above preferred embodiment is not to limit
The system present invention, those skilled in the art can make various changes and profit without departing from the spirit and scope of the present invention
Decorations, therefore protection scope of the present invention subjects to the scope of the claims.
Claims (10)
1. a kind of temperature-detecting device characterized by comprising
Temperature sensor input unit, for accessing thermocouple；
Voltage amplification module, input terminal are connect with the temperature sensor input unit, for the temperature sensor is defeated
The detectable voltage signals for entering unit are amplified to obtain amplified signal；
Integration module is connect to obtain the amplification of the voltage amplification module output with the output end of the voltage amplification module
Signal, and integral operation is carried out to the amplified signal；
Voltage comparison module connect the integral voltage to export after the integral operation by the integration module with the integration module
It is compared with predeterminated voltage, and comparison result signal is exported according to comparison result；
Central processing module is connect with the voltage comparison module, and the central processing module is used to relatively be tied according to described
Fruit signal calculates the temperature value of corresponding temperature sensor.
2. temperature-detecting device according to claim 1, which is characterized in that the central processing module is used for according to
The duration of predetermined level in comparison result signal calculates the temperature value.
3. temperature-detecting device according to claim 1 or 2, which is characterized in that the integration module includes the first gating
Switch and integral unit, first gating switch are connect with the integral unit, the central processing module and described the
The control terminal of one gating switch is connected to control the integral unit in integration phase and electric discharge by first gating unit
Switch between stage.
4. temperature-detecting device according to claim 3, which is characterized in that the integral unit includes capacitor C23, resistance
R20 and the first operational amplifier；
The inverting input terminal of first operational amplifier respectively with the first end of the capacitor C23 and the resistance R20
The normal phase input end of first end connection, first operational amplifier accesses the first reference voltage, first operational amplifier
Output end connect respectively with the second end of the voltage comparison module and the capacitor C23, first gating switch
Port Z is connect with the second end of the capacitor C23, the first end of the port Z1 of first gating switch and the capacitor C23
Connection, the port x of first gating switch are connect with the second end of the resistance R20, and the one of first gating switch is defeated
Enter end to connect with the output end of the voltage amplification module；
The central processing module is connect with the control terminal of first gating switch, is being integrated with controlling the integration module
Switch between stage and discharge regime.
5. temperature-detecting device according to claim 4, which is characterized in that in integration phase, first gating is opened
Pass will be isolated between port Z and port Z1, the input terminal of control module connection and the port x be connected, capacitor C23, electricity
Resistance R20 and the first operational amplifier constitute integral unit and charge to capacitor C23；
In discharge regime, first gating switch is by port Z and port Z1 connection, to discharge capacitor C23.
6. temperature-detecting device according to claim 5, which is characterized in that the voltage comparison module includes the second operation
Amplifier；
The inverting input terminal of the second operational amplifier is connect with the output end of first operational amplifier；
The normal phase input end of the second operational amplifier also accesses the first reference voltage.
7. temperature-detecting device according to claim 6, which is characterized in that further include latch, second operation is put
The big output end of device is connect with an input terminal of the latch, the output end of the latch and another input terminal with it is described
Central processing module connection.
8. temperature-detecting device according to claim 4, which is characterized in that the integral unit further includes that reference voltage mentions
For unit, which provides unit and is used to provide preset benchmark electricity to the normal phase input end of first operational amplifier
Pressure；
It includes reference voltage chip U2, resistance R12, resistance R26, resistance R10, capacitor C20, capacitor that the reference voltage, which provides unit,
C13, resistance R16 and resistance R17；Resistance R12, resistance R26, resistance R10 are sequentially connected, separate resistance of resistance R12
Predeterminated voltage, the common node company of the cathode of the reference voltage chip and resistance R12 and resistance R26 are accessed in one end of R26
It connects, the anode of reference voltage chip U2 is connect with one end far from resistance R26 of resistance R10, reference voltage chip
Control electrode is connect with the common node of resistance R26 and resistance R10, the both ends of capacitor C20 respectively with the reference voltage core
The cathode and anode of piece U2 connects, and the both ends of capacitor C13 connect with the cathode of reference voltage chip U2 and anode respectively
It connects, one end of resistance R16 is connect with one end of capacitor C13, and the other end of resistance R16 is connect with one end of resistance R17, resistance
The common node of the other end connect and ground of the other end of R17 and capacitor C13, resistance R16 and resistance R17 and this
The normal phase input end of one operational amplifier F2 connects.
9. temperature-detecting device according to claim 1, which is characterized in that the temperature sensor input unit includes electricity
Hinder R1, resistance R6 and capacitor C1；
The both ends of the thermocouple are connect with the both ends of the resistance R6 respectively, and predeterminated voltage is accessed in one end of the resistance R1,
The other end of the resistance R1 is connect with one end of the resistance R6, one end of the other end of the resistance R6 and the capacitor C1
Connection, the other end ground connection of the capacitor C1；The voltage of the common node of the resistance R6 and the capacitor C1 is the inspection
Survey voltage signal.
10. temperature-detecting device according to claim 9, which is characterized in that the central processing module respectively with it is described
The common node of the resistance R1 and resistance R6 of temperature sensor input unit are connected to detect whether corresponding thermocouples have connection
On.
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| CN201811572038.0A CN109357778A (en) | 2018-12-21 | 2018-12-21 | Temperature-detecting device |
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| 李晓明等: "《电路与电子技术》", 31 July 2004, 高等教育出版社 * |
| 许卫等: "双积分AD转换设计", 《2013年全国大学生电子设计竞赛》 * |
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