CN110057462A - A kind of temperature sensing circuit - Google Patents
A kind of temperature sensing circuit Download PDFInfo
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- CN110057462A CN110057462A CN201910457171.XA CN201910457171A CN110057462A CN 110057462 A CN110057462 A CN 110057462A CN 201910457171 A CN201910457171 A CN 201910457171A CN 110057462 A CN110057462 A CN 110057462A
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- thermal resistance
- temperature sensing
- voltage signal
- signal
- sensing circuit
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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
- G01K7/18—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 linear resistance, e.g. platinum resistance thermometer
- G01K7/20—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 linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
Abstract
The present invention provides a kind of temperature sensing circuits, for solving compatibling problem of the thermal resistance in the same temperature sensing circuit of a variety of different models.Temperature sensing circuit of the invention can adjust comparator according to actual condition, the operating parameter of analog switch, so that overlapping interval is not present in N number of value range of the corresponding second voltage signal of thermal resistance of the N kind different model within the scope of default temperature, or, the difference between the corresponding N number of second voltage signal of the thermal resistance of the N kind different model is less than preset threshold at the same temperature, different second voltage signals is allowed to map unique temperature detection information, solve compatibling problem of the thermal resistance in the same temperature sensing circuit of a variety of different models.Manual identified thermal resistance model is not needed during later maintenance, O&M is convenient, and reduces development cost without designing various temperature detection circuit.
Description
Technical field
The present invention relates to sensor technical field more particularly to a kind of temperature sensing circuits.
Background technique
The resistance and temperature detection circuit of present mainstream makes the resistance value of thermal resistance be converted to voltage letter by DC source
Number, corresponding temperature value is mapped to after the voltage signal that processor samples.
In practice, due to the complexity of operating condition, compatible Multiple Type thermal resistance may require that in the same project.It is existing
Scheme solves the project demands often by a variety of temperature sensing circuits is designed, and the same temperature sensing circuit can not spirit
Switching living uses different types of thermal resistance, and manual identified thermal resistance model is needed during later maintenance, and O&M is inconvenient, and
And design various temperature detection circuit increases development cost.
Summary of the invention
The present invention provides a kind of temperature sensing circuits, for solving the thermal resistance of a variety of different models in the same temperature
The compatibling problem of detection circuit.
The present invention provides a kind of temperature sensing circuits comprising:
Power module, target thermal resistance, comparator, analog switch, signal amplification circuit and processor, wherein the mould
Quasi- switch is separately connected with the comparator and the signal amplification circuit, and the signal amplification circuit and the processor connect
It connects；The target thermal resistance is one of the thermal resistance of N kind different model, and the N is the positive integer not less than 2；
The comparator is used to detect the first voltage signal of target thermal resistance access point, and is believed according to the first voltage
Threshold range locating for number exports corresponding first order output signal, the N kind different model within the scope of default temperature
Overlapping interval is not present in N number of value range of the corresponding first voltage signal of thermal resistance；
The analog switch is for exporting the corresponding second level output signal of the first order output signal, the second level
Output signal is for controlling the signal amplification circuit to the amplification factor of the first voltage signal；
The processor is first voltage signal process for detecting second voltage signal, the second voltage signal
Voltage signal after the signal amplification circuit；
N number of value of the corresponding second voltage signal of thermal resistance of the N kind different model within the scope of default temperature
Overlapping interval is not present in range, or, the corresponding N number of second voltage letter of the thermal resistance of the N kind different model at the same temperature
Difference between number is less than preset threshold；
The processor is also used to export the corresponding temperature detection letter of the second voltage signal according to preset mapping table
Breath.
Optionally, as a kind of possible embodiment, in the embodiment of the present invention, as N=2 and the target thermal resistance is
When one of PT100 platinum resistance thermometer sensor, or PT1000 platinum resistance thermometer sensor, the corresponding amplification factor of PT100 platinum resistance thermometer sensor, is K1,
The corresponding amplification factor of PT1000 platinum resistance thermometer sensor, is K2, the K1/K2=10.
Optionally, as a kind of possible embodiment, in the temperature sensing circuit of the embodiment of the present invention, when the temperature
When detection circuit does not have target thermal resistance access, the first voltage signal is after signal amplification circuit amplification
Obtained voltage value is greater than M or is less than P, and the M is that the thermal resistance of the N kind different model within the scope of default temperature is corresponding
Second voltage signal N number of value range in maximum value, the P is the N kind different shaped within the scope of default temperature
Number the corresponding second voltage signal of thermal resistance N number of value range in minimum value.
Optionally, as a kind of possible embodiment, in the temperature sensing circuit of the embodiment of the present invention, the target heat
Resistance accesses the temperature sensing circuit in a manner of 2 line systems, 3 line systems or 4 line systems.
Optionally, as a kind of possible embodiment, in the temperature sensing circuit of the embodiment of the present invention, the power supply mould
Block is constant-current source.
Optionally, as a kind of possible embodiment, in the temperature sensing circuit of the embodiment of the present invention, the signal is put
Big circuit is differential amplifier circuit.
Optionally, as a kind of possible embodiment, in the temperature sensing circuit of the embodiment of the present invention, the signal is put
Big circuit is in-phase amplification circuit.
Optionally, as a kind of possible embodiment, in the temperature sensing circuit of the embodiment of the present invention, the comparator
It is made of the OC output type comparator circuit built based on LM2903 chip.
Optionally, as a kind of possible embodiment, in the temperature sensing circuit of the embodiment of the present invention, the simulation is opened
Pass is made of the analog switching circuit set up based on CD4052B chip.
As can be seen from the above technical solutions, the invention has the following advantages that
Temperature sensing circuit in the embodiment of the present invention can adjust the operation of comparator, analog switch according to actual condition
Parameter so that within the scope of default temperature the corresponding second voltage signal of thermal resistance of the N kind different model N number of value
Overlapping interval is not present in range, or, the corresponding N number of second voltage letter of the thermal resistance of the N kind different model at the same temperature
Difference between number is less than preset threshold, and different second voltage signals is allowed to map unique temperature detection information, solves
Compatibling problem of the thermal resistance for a variety of different models of having determined in the same temperature sensing circuit.Very important person is not required to during later maintenance
Work identifies thermal resistance model, and O&M is convenient, and reduces development cost without designing various temperature detection circuit.
Detailed description of the invention
Fig. 1 is a kind of one embodiment schematic diagram of temperature sensing circuit in the embodiment of the present invention；
Fig. 2 is a kind of one embodiment schematic diagram of temperature sensing circuit in the embodiment of the present invention；
Fig. 3 is an a kind of specific constant-current source and difference in embodiment of temperature sensing circuit in the embodiment of the present invention
Divide amplification circuit structure schematic diagram；
Fig. 4 is an a kind of specific thermal resistance access in embodiment of temperature sensing circuit in the embodiment of the present invention
Electrical block diagram；
Fig. 5 is an a kind of specific analog switch electricity in embodiment of temperature sensing circuit in the embodiment of the present invention
Line structure schematic diagram
Fig. 6 is an a kind of specific comparator circuit in embodiment of temperature sensing circuit in the embodiment of the present invention
Structural schematic diagram.
Specific embodiment
The embodiment of the invention provides a kind of temperature sensing circuits, for solving the thermal resistance of a variety of different models same
The compatibling problem of a temperature sensing circuit.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
Description and claims of this specification and term " first ", " second ", " third ", " in above-mentioned attached drawing
Four " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so that the embodiments described herein can be in addition to illustrating herein or describing
Sequence other than appearance is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that covering is non-exclusive
Include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to clearly arrange
Those of out step or unit, but may include be not clearly listed or it is solid for these process, methods, product or equipment
The other step or units having.
In order to make it easy to understand, the detailed process in the embodiment of the present invention is described below, referring to Fig. 1, of the invention
A kind of one embodiment of temperature sensing circuit can include:
Power module 10, target thermal resistance 20, comparator 30, analog switch 40, signal amplification circuit 50 and processor 60,
Wherein, analog switch 40 is connect with comparator 30 and signal amplification circuit 50 respectively, signal amplification circuit 50 respectively with processor
60 and target thermal resistance 20 connect, target thermal resistance 20 also connect with comparator 30 and power module 10；Target thermal resistance 20 is N
One of the thermal resistance of kind different model, N are the positive integer not less than 2；
Comparator 30 is used to detect the first voltage signal of target thermal resistance access point, and according to locating for first voltage signal
Threshold range export corresponding first order output signal；
Analog switch 40 is used for exporting the corresponding second level output signal of first order output signal, second level output signal
In control signal amplifying circuit to the amplification factor of first voltage signal；
Processor 60 is first voltage signal by signal amplification electricity for detecting second voltage signal, second voltage signal
Voltage signal after road；
N number of value range of the corresponding second voltage signal of thermal resistance of N kind different model within the scope of default temperature
There is no overlapping intervals, or, at the same temperature between the corresponding N number of second voltage signal of the thermal resistance of N kind different model
Difference is less than preset threshold；
Processor 60 is also used to export the corresponding temperature detection information of second voltage signal according to preset mapping table.
By the combination of comparator and analog switch, the automatic switchover of amplification factor is realized, realize the heat of N kind different model
The compatible thermometric of resistance and thermal resistance insertion detection, avoid the change that software or hardware are carried out when the thermal resistance of replacement different model,
It improves efficiency；The insertion detection of thermal resistance is realized in same processor port, has saved the port resource of processor.
The carrying out practically principle to the temperature sensing circuit in the embodiment of the present invention is illustrated below.Power module can
To be constant-current source, specifically herein without limitation.When there is target thermal resistance cut-in temperature detection circuit, comparator be can detecte
The first voltage signal of target thermal resistance access point, and the output of the threshold range according to locating for first voltage signal corresponding first
Grade output signal.Specifically, in the voltage or constant electric current of power supply output, the N kind different model within the scope of default temperature
The first voltage signal of access point of thermal resistance be to be varied with temperature in certain value range, which can be preparatory
It is calculated, N number of value range of the corresponding first voltage signal of thermal resistance of N kind different model within the scope of default temperature
There is no overlapping intervals.After detecting first voltage signal, comparator can be according to preset logic, according to first voltage
Threshold range locating for signal exports the corresponding first order and outputs signal to analog switch.It will for example, two threshold values can be set
First voltage signal is divided into three value ranges, determines that first voltage is believed compared with preset threshold by first voltage signal
Value range locating for number.
In practice, the first voltage signal in detection circuit is often relatively small numerical value, in order to improve inspection
Precision is surveyed, needs to amplify processing to the first signal using signal amplification circuit.For this purpose, analog switch receives first voltage
The second level output signal for control signal amplifying circuit to the amplification factor of first voltage signal can be exported after signal,
First voltage signal is amplified with control signal amplifying circuit to obtain second voltage signal, the setting of specific amplification factor
Need to meet following principle: the corresponding second voltage signal of thermal resistance of N kind different model is N number of within the scope of default temperature
Overlapping interval is not present in value range, or, the corresponding N number of second voltage letter of the thermal resistance of N kind different model at the same temperature
Difference between number is less than preset threshold.
Finally, after processor 60 collects second voltage signal second voltage can be exported according to preset mapping table
The corresponding temperature detection information of signal, completes the detection of temperature.
Temperature sensing circuit in the embodiment of the present invention can adjust the operation of comparator, analog switch according to actual condition
Parameter so that within the scope of default temperature the corresponding second voltage signal of thermal resistance of N kind different model N number of value range
There is no overlapping intervals, or, at the same temperature between the corresponding N number of second voltage signal of the thermal resistance of N kind different model
Difference is less than preset threshold, allows different second voltage signals to map unique temperature detection information, solves a variety of
Compatibling problem of the thermal resistance of different model in the same temperature sensing circuit.Manual identified heat is not needed during later maintenance
Resistance model, O&M is convenient, and reduces development cost without designing various temperature detection circuit.
On the basis of above-mentioned embodiment shown in FIG. 1, scheme will realize whether thermal resistance is inserted into detection, existing side at present
Additional adjunct circuit is generally required in case, and is occupied a port on a processor and be used to detect.For save the cost, originally
In inventive embodiments, when temperature sensing circuit does not have the access of target thermal resistance, second level output signal is set, so that by letter
The voltage value obtained after the amplification of number amplifying circuit is greater than M or is less than P, which is the N kind different model within the scope of default temperature
The corresponding second voltage signal of thermal resistance N number of value range in maximum value, which is the N kind within the scope of default temperature
Minimum value in N number of value range of the corresponding second voltage signal of the thermal resistance of different model.Compared in this way using same
Device circuit and analog switch, it is an insertion that the second voltage signal corresponding voltage value to processor port is sent when so that hanging
The voltage value being not achieved when thermal resistance realizes directly by processor AD port sampled value it may determine that whether thermal resistance is inserted
Enter, has saved hardware cost.
In order to make it easy to understand, below only with N=2, and target thermal resistance is PT100 platinum resistance thermometer sensor, or PT1000 platinum resistance thermometer sensor,
One of, for processor uses MCU, the temperature sensing circuit in the embodiment of the present invention is illustrated.It is understood that
It is, it can also be using three or three or more thermal resistances or using PT100 platinum heat or PT1000 platinum resistance thermometer sensor, in practice
Except thermal resistance, specifically herein without limitation.
Referring to Fig. 2, for the ease of subsequent descriptions, it is assumed here that power module is that constant-current source output is 1mA.PT100 platinum
Thermal resistance -40 DEG C~+150 DEG C section resistance ranges be 84.3 Ω~157.3 Ω, PT1000 platinum resistance thermometer sensor, -40 DEG C~+
150 DEG C of section resistance ranges are the Ω of 842.7 Ω~1573.3.If insertion is PT100 platinum resistance thermometer sensor, constant-current source output
First voltage signal Vpt range to temperature detecting resistance PT100 is 84.3mV~157.3mV, and insertion is PT1000 platinum resistance thermometer sensor,
If, first voltage signal Vpt range is 842.7mV~1573.3mV.The range of the first voltage signal of the two is not overlapped
Section.
As a kind of possible embodiment, optionally, two comparator circuit (comparators can be used in the present embodiment
A, B) the comparison for being implemented in combination with thermal resistance voltage value, wherein maximum of the threshold value of comparator A in the corresponding Vpt range of PT100
A median is taken between value and the minimum value of the corresponding Vpt range of PT1000, for taking 500mV here.Vpt is less than 500mV, then
The output of comparator A first order output signal is that 0, Vpt is greater than 500mV, then the output of comparator A first order output signal is 1.
When not having platinum resistance thermometer sensor, insertion, since port is hanging, Vpt can be equal to amplifier and export upper rail, this sentences 15V act
Example.The threshold value of comparator B takes a median between maximum value and amplifier the output upper rail of the corresponding Vpt range of PT1000, this
In take 5V for.Vpt is less than 5V, then comparator B first order output signal exports 0, Vpt greater than 5V, then the comparator B first order is defeated
Signal output 1 out.
The output first order output signal (being indicated respectively with a, b) of comparator A, B are different for controlling analog switch conducting
Access.The corresponding second level output signal of analog switch output first order output signal controls different accesses and is connected and then controls
Amplification factor in differential amplifier circuit processed.
If being inserted into PT100, by above-mentioned condition, a=0, b=0 are arranged the resistance be connected at this time, make differential amplification
Circuit amplification factor is K1=10, then the voltage value after the amplification that MCU sampling end receives is 843~1573mV.It can manage
Solution, amplification factor is not fixed herein requires, and is no more than the port the MCU upper limit.
If being inserted into PT1000, by above-mentioned condition, a=1, b=0 are arranged the resistance be connected at this time, make differential amplification
Circuit amplification factor is K2=1, then the voltage value that MCU sampling end receives is 843~1573mV, i.e., is inserted at the same temperature
Difference between the corresponding second voltage signal of both PT100 or insertion PT1000 is less than preset threshold.Preset threshold can root
It is arranged according to actual needs, temperature measurement accuracy determines setting range according to actual needs.It is understood that amplification factor herein
Be preferably provided with K1/K2=10, other multiples optionally also can be set, it is only necessary to guarantee within the scope of default temperature two kinds not
There is no overlapping intervals for the value range for the second voltage signal that corresponding MCU sampling end receives with the thermal resistance of model i.e.
It can.
If being not inserted into platinum resistance thermometer sensor, by above-mentioned condition, a=1, b=1 are arranged the resistance be connected at this time, make difference
Amplifying circuit amplification factor is 1/100, then the voltage value that MCU sampling end receives is 150mV.Amplification factor is not fixed herein
Demand, as long as meeting the output minimum value when voltage value that MCU is received is less than insertion platinum resistance thermometer sensor, or being greater than insertion platinum thermoelectricity
Output maximum value when resistance.
Amplification factor is preferably provided with K1/K2=10 herein at this time, and that no matter be inserted into is PT100 or PT1000, inside MCU
After AD sampling, same table or formula temperature can be used.Sample the voltage more than platinum resistance thermometer sensor, value range, so that it may sentence
Break to be not inserted into platinum resistance thermometer sensor,.
Further, Fig. 3, Fig. 4, Fig. 5 and Fig. 6 are please referred to, is realized below in conjunction with specific circuit to of the invention real
The temperature sensing circuit applied in example is illustrated.
In the present embodiment, constant-current source is built using amplifier TLV2171, due to R17 > > R23, so output electric current can be about
Input difference voltage 3V/R23 equal to amplifier U1.Output electric current is set as 0.5mA in the present embodiment.Reason is to avoid platinum hot
Resistance is because operating current heating influences thermometric.General that PT1000 operating current is recommended to be less than 0.5mA, PT100 operating current is small
In 5mA, the two standard smaller 0.5mA is taken herein.
3 line platinum resistance thermometer sensor,s, the input of the end PT-A, the reference of the end PT-B, the end PT-C ground connection can be used in embodiment.
When insertion be PT100 when, -40 DEG C~+150 DEG C section resistance ranges be the Ω of 84.3 Ω~157.3, therefore scheme
The middle position PT-A first voltage range of signal is 42.15mV~78.65mV.
When insertion be PT1000 when, -40 DEG C~+150 DEG C section resistance ranges be the Ω of 842.7 Ω~1573.3, because
The position PT-A first voltage range of signal is 421.35mV~786.65mV in this figure.
It is Vcc-0.35V that TLV2171, which exports upper rail, constant-current source TLV2171 use ± 15V power supply in the present embodiment, therefore
When being not inserted into platinum resistance thermometer sensor, the position PT-A voltage-to-ground is 14.65V.
Two comparator circuits are set in the present embodiment, are indicated respectively with comparator A, B, comparator part uses LM2903
It builds, is OC output type comparator, output end needs connecting resistance to pull up.The portion U3 on the left of Fig. 6 shown in circuit, in comparator A
The comparison point divided is set as 300mV, divides to obtain by R7 and R22.So when PT-A voltage is lower than 300mV, first order output letter
Number a=0, comparator A export low level, and PT-SW-A is low, about 0.3V herein；When PT-A voltage is higher than 300mV, the first order
Output signal a=1, comparator A export high level, and PT-SW-A exports high level after pulling up, herein about 15V.
On the right side of Fig. 6 shown in circuit diagram, the comparison point of the part U4 is set as 5V in comparator B.So PT-A voltage is lower than
When 5V, first order output signal b=0, comparator B export low level, and PT-SW-B is low, about 0.3V herein；PT-A voltage is high
When 5V, the first order output signal b=1, comparator B export high level, and PT-SW-B exports high level after pulling up, herein about
For 15V.
Thus, being inserted into PT1000 in insertion PT100 and being not inserted into the case of three kinds of platinum resistance thermometer sensor, comparator part
Output first order output signal as in the following table 1 shown in table.
| Insert state | a | b |
| PT100 | 0 | 0 |
| PT1000 | 1 | 0 |
| It is not inserted into | 1 | 1 |
Table 1
As shown in figure 5, analog switch has selected CD4052B in the present embodiment, output second level output signal is corresponding
Truth table is as shown in table 2 below.Illustrate herein under, such as in the case where the first order output signal a=0, b=0, that is, be connected
0x, 0y.The analog switch chip U2 in Fig. 5 is corresponded to, i.e., XIN/OUT0 (corresponding network PT-100-A) is (corresponding with COMX at this time
Network G ND) conducting；YIN/OUT0 (corresponding network PT-100-B) and COMY (corresponding network PT-SW-Y) are connected.
Table 2
So when being inserted into PT100, the amplification factor that differential amplifier circuit is arranged is 20, the as ratio of resistance R8/R1,
Corresponding PT-AD range at this time, i.e. second voltage range of signal are 843mV~1573mV.
When being inserted into PT1000, the amplification factor that differential amplifier circuit is arranged is 2, and the as ratio of resistance R3/R1 is right at this time
The PT-AD range answered, i.e. second voltage range of signal are 843mV~1573mV, consistent with PT100, so that at the same temperature 2
Difference between the corresponding 2 second voltage signals of thermal resistance of kind different model is less than preset threshold.
When being not inserted into platinum resistance thermometer sensor, the amplification factor that differential amplifier circuit is arranged is 0.02, the as ratio of resistance R5/R1
Value, corresponding PT-AD voltage is 293mV at this time, and voltage value when far below insertion platinum resistance thermometer sensor, MCU can directly make and not insert
The judgement entered.
The voltage range of PT-AD is 843mV~1573mV when due to insertion platinum resistance thermometer sensor, passes through change R5, R6 resistance
Value, makes the amplification factor of differential amplifier circuit become larger.Such as if becoming 0.17, it is right in the case where platinum resistance thermometer sensor, to be not inserted at this time
The PT-AD voltage answered is 2490mV, and voltage value when much higher than insertion platinum resistance thermometer sensor, MCU still can directly make sentencing of being not inserted into
It is disconnected.
It is understood that circuit diagram, that is, component selection in above-mentioned Fig. 3, Fig. 4, Fig. 5 and embodiment shown in fig. 6
Be only exemplary, can change constant current source structure in practice, for example, change Constant current input voltage, resistance configuration,
Output electric current etc. builds constant-current source using other circuit topologies.Using 2 line systems, 3 line systems, 4 line platinum resistance thermometer sensor,s are corresponding to implement
Example, it is only necessary to change access interface.The amplification factor of PT100 and PT1000 is changed in the case where meeting relationship.Meeting condition
In the case where amplification factor of change when being not inserted into platinum resistance thermometer sensor,.Other circuit topologies can also be used to build amplifying circuit, example
Such as in-phase amplification circuit.Other kinds of device can also be used to build the final institute of analog switch in combinational circuit implementation example real
Existing function.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of temperature sensing circuit characterized by comprising
Power module, target thermal resistance, comparator, analog switch, signal amplification circuit and processor, wherein the simulation is opened
Pass is separately connected with the comparator and the signal amplification circuit, and the signal amplification circuit is connected to the processor；Institute
One of the thermal resistance that target thermal resistance is N kind different model is stated, the N is the positive integer not less than 2；
The comparator is used to detect the first voltage signal of target thermal resistance access point, and according to the first voltage signal institute
The threshold range at place exports corresponding first order output signal, the thermoelectricity of the N kind different model within the scope of default temperature
Overlapping interval is not present in the N number of value range for hindering corresponding first voltage signal；
The analog switch is for exporting the corresponding second level output signal of the first order output signal, the second level output
Signal is for controlling the signal amplification circuit to the amplification factor of the first voltage signal；
The processor is described in the first voltage signal passes through for detecting second voltage signal, the second voltage signal
Voltage signal after signal amplification circuit, the thermal resistance of the N kind different model corresponding the within the scope of default temperature
Overlapping interval is not present in N number of value range of two voltage signals, or, the thermal resistance of the N kind different model at the same temperature
Difference between corresponding N number of second voltage signal is less than preset threshold；
The processor is also used to export the corresponding temperature detection information of the second voltage signal according to preset mapping table.
2. temperature sensing circuit according to claim 1, which is characterized in that as N=2 and the target thermal resistance is
When one of PT100 platinum resistance thermometer sensor, or PT1000 platinum resistance thermometer sensor, the corresponding amplification factor of PT100 platinum resistance thermometer sensor, is K1,
The corresponding amplification factor of PT1000 platinum resistance thermometer sensor, is K2, the K1/K2=10.
3. temperature sensing circuit according to claim 1, which is characterized in that when the temperature sensing circuit does not have the mesh
When marking thermal resistance access, the voltage value that the first voltage signal obtains after signal amplification circuit amplification is greater than M
Or it is less than P, the M is the N of the corresponding second voltage signal of thermal resistance of the N kind different model within the scope of default temperature
Maximum value in a value range, the P are the thermal resistance of the N kind different model within the scope of default temperature corresponding the
Minimum value in N number of value range of two voltage signals.
4. temperature sensing circuit according to any one of claim 1 to 3, which is characterized in that the target thermal resistance is with 2
The mode of line system, 3 line systems or 4 lines accesses the temperature sensing circuit.
5. temperature sensing circuit according to claim 4, which is characterized in that the power module is constant-current source.
6. temperature sensing circuit according to claim 5, which is characterized in that the signal amplification circuit is differential amplification electricity
Road.
7. temperature sensing circuit according to claim 5, which is characterized in that the signal amplification circuit is electric with mutually amplifying
Road.
8. temperature sensing circuit according to claim 5, which is characterized in that the comparator based on LM2903 chip by being taken
The OC output type comparator circuit built is constituted.
9. temperature sensing circuit according to claim 5, which is characterized in that the analog switch is by being based on CD4052B core
The analog switching circuit that piece is set up is constituted.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113595571A (en) * | 2021-07-29 | 2021-11-02 | 廊坊市东润电子科技有限公司 | Circuit signal processing method, pipeline blockage detection signal receiver and pipeline blockage detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113595571A (en) * | 2021-07-29 | 2021-11-02 | 廊坊市东润电子科技有限公司 | Circuit signal processing method, pipeline blockage detection signal receiver and pipeline blockage detector |
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