CN105005337B - Digital temperature measuring and controlling instrument circuit - Google Patents
Digital temperature measuring and controlling instrument circuit Download PDFInfo
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- CN105005337B CN105005337B CN201510462509.2A CN201510462509A CN105005337B CN 105005337 B CN105005337 B CN 105005337B CN 201510462509 A CN201510462509 A CN 201510462509A CN 105005337 B CN105005337 B CN 105005337B
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Abstract
The invention relates to the field of temperature measurement and control. A digital temperature measuring and controlling instrument circuit comprises a temperature detecting circuit, a temperature setting circuit, a temperature processing circuit and an LED display, wherein the temperature detecting circuit, the temperature setting circuit, the temperature processing circuit and the LED display are connected in sequence. The digital temperature measuring and controlling instrument circuit further comprises a temperature control circuit which is connected between the temperature detecting circuit and the temperature setting circuit. The digital temperature measuring and controlling instrument circuit provided by the invention has the advantages of cheap cost and high precision.
Description
Technical field
The present invention relates to measurement and control of temperature field, and in particular to a kind of digital temperature observing and controlling instrument circuit.
Background technology
In daily productive life, it is more and more where need to carry out measurement and control of temperature.But current temperature measurement-control instrument
Into polarization.The precision of the comparatively cheap temperature measurement-control instrument of price is relatively low, and the higher temperature measurement-control instrument price of precision is high
It is expensive.It is badly in need of a kind of moderate and higher temperature measurement-control instrument of precision now, the present invention is just applying to this temperature measurement-control instrument
Measurement and control of temperature instrument circuit.
The content of the invention
The present invention provides a kind of digital temperature observing and controlling instrument circuit, with solve that existing measurement and control instrument precision is relatively low or price compared with
Expensive problem.
To solve problem above, using following scheme：
Scheme one：A kind of digital temperature observing and controlling instrument circuit, including temperature sensing circuit, the temperature setting electricity being sequentially connected
Road, Temperature Treatment circuit and LED display, and the temperature control being connected between temperature sensing circuit and temperature setting circuit
Circuit；The temperature sensing circuit includes the operational amplifier IC1 and operational amplifier IC2 being connected with operational amplifier IC1；Fortune
Thermistor R1 and electric capacity C1 is parallel with the negative-feedback for calculating amplifier IC1；The inverting input of operational amplifier IC1 is through electricity
Resistance R2 connects the output end of the temperature setting circuit；The in-phase input end connection adjustable resistance RP1 of operational amplifier IC1 and electricity
Resistance R5, connects resistance R4 between adjustable resistance RP1 and the output end of temperature setting circuit；Output end Jing of operational amplifier IC1
The inverting input of resistance R3 concatenation operation amplifier IC2 is crossed, the in-phase input end of operational amplifier IC2 connects through resistance R6
Resistance R5；Serial adjustable resistance RP2 in the negative-feedback of operational amplifier IC2；The output end connection measurement of operational amplifier IC2
End；The adjustable resistance RP3 that temperature setting circuit includes setting end and is connected with setting end；Adjustable resistance RP3 and resistance R8 is constituted
Series arm shunt regulator diode D1；The anode A and reference level R of Zener diode D1 connects resistance R7 simultaneously and temperature sets
Determine the output end of circuit；The positive voltage terminal that resistance R7 connection power supply groups are provided；Temperature-control circuit includes operational amplifier IC3,
The homophase input termination setting end of operational amplifier IC3, the anti-phase input termination measurement end of operational amplifier IC3, operation amplifier
The output end of device IC3 connects the base stage of NPN type triode Q1 through resistance R9；Diode D2 is connected to NPN type triode Q1
Between emitter stage and base stage, the emitter stage of NPN type triode Q1 connects the negative voltage side provided by power supply group；NPN type triode
Colelctor electrode connection diode D3 anode and one end of relay K, the negative electrode of diode D3 and the other end of relay K connect
The positive voltage terminal provided by power supply group is provided.
Operation principle：Temperature sensing circuit detects temperature signal and temperature signal is converted to into electric signal and temperature is delivered to
In degree initialization circuit, signal transmission is to Temperature Treatment circuit, Temperature Treatment circuit Jing after temperature setting circuit is directly over buffering
Temperature value is shown on LED display after process signal.Temperature-control circuit is adjusted, telemetry circuit of the present invention can be set
Scope.
Beneficial effect：1. temperature sensing circuit, temperature setting circuit, Temperature Treatment circuit and LED display are sequentially connected,
Connect temperature-control circuit, present invention simple structure used, components and parts used between temperature sensing circuit and temperature setting circuit
It is less, therefore cost reduction.2. temperature sensing circuit described in includes operational amplifier IC1 and is connected with operational amplifier IC1
Operational amplifier IC2；Thermistor R1 and electric capacity C1 is parallel with the negative-feedback of operational amplifier IC1；Operational amplifier IC1's
Inverting input connects the output end of the temperature setting circuit through resistance R2；The in-phase input end of operational amplifier IC1 connects
Adjustable resistance RP1 and resistance R5 is met, resistance R4 is connected between adjustable resistance RP1 and the output end of temperature setting circuit；Computing is put
The output end of big device IC1 is through the inverting input of resistance R3 concatenation operation amplifier IC2, and the homophase of operational amplifier IC2 is defeated
Enter end and connect resistance R5 through resistance R6；Serial adjustable resistance RP2 in the negative-feedback of operational amplifier IC2；Operational amplifier IC2
Output end connection measurement end；It is convenient to detect temperature in time and temperature signal is delivered to into circuit below.
The value range of convenient setting observing and controlling temperature.It is convenient that selection operation is carried out in setting pattern and TT ＆ C.
Scheme two：On the basis of scheme one further, Temperature Treatment circuit includes analog-digital converter ICL7107CPL, mould
The positive voltage terminal that the V+ ends connection of number converter ICL7107CPL is provided by power supply group, the OSC1 ends connection resistance of ICL7107CPL
One end of R13 and one end of electric capacity C4, the other end of resistance R13 connects the OSC2 ends of ICL7107CPL, the other end of electric capacity C4
The OSC3 ends of connection ICL7107CPL；The AZ ends of ICL7107CPL connect one end of electric capacity C5, the other end connection electricity of electric capacity C5
One end of resistance R14 and one end of electric capacity C6, the other end of resistance R14 connects the BUF ends of ICL7107CPL, the other end of electric capacity C6
The INT ends of connection ICL7107CPL；One end and one end of electric capacity C1 of the IN+ ends connection resistance R10 of ICL7107CPL, electric capacity
The other end ground connection of C1；The IN- ends of ICL7107CPL and COM ends are grounded；The other end connection single-pole double-throw switch (SPDT) SA of resistance R10
Movable end and resistance R11 one end, two fixing ends for switching SA respectively set end and measurement end；Resistance R11's is another
One end of end connection adjustable resistance RP4, the adjustable end of adjustable resistance RP4 connects the REFLO ends of ICL7107CPL, adjustable resistance
The other end of RP4 connects one end of resistance R12, the other end ground connection of resistance R12；The GND ends ground connection of ICL7107CPL；
One end of the V- ends connection electric capacity C2 of ICL7107CPL and the negative voltage side provided by power supply group, the other end ground connection of electric capacity C2；
The CR- of ICL7107CPL connects one end of electric capacity C3, and the other end of electric capacity C3 connects the CR+ ends of ICL7107CPL.With modulus
Converter IC L7107CPL not only low price and also using ICL7107CPL can compensate for thermistor with temperature rise it is highly sensitive
The shortcoming that degree is reduced, effectively improves the precision of integrated circuit.The function of having for gamma correction in Temperature Treatment circuit is made, is had
Beneficial to the precision for improving digital temperature observing and controlling instrument circuit.
Description of the drawings
Fig. 1 is the circuit diagram of the temperature sensing circuit of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the temperature setting circuit of the embodiment of the present invention；
Fig. 3 is the circuit diagram of the temperature-control circuit of the embodiment of the present invention；
Fig. 4 is the circuit diagram of the Temperature Treatment circuit of the embodiment of the present invention.
Specific embodiment
Below by specific embodiment, the present invention is further detailed explanation：
Reference in Figure of description includes：Thermistor R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
Resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, adjustable resistance
RP1, adjustable resistance RP2, adjustable resistance RP3, adjustable resistance RP4, switch SA, operational amplifier IC1, operational amplifier IC2, fortune
Calculate amplifier IC3, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, Zener diode D1, diode D2,
Diode D3, triode Q1, reference level R, anode A, negative electrode K, relay K.
A kind of digital temperature observing and controlling instrument circuit, including the temperature sensing circuit, temperature setting circuit, the temperature that are sequentially connected
Process circuit and LED display, and the temperature-control circuit being connected between temperature sensing circuit and temperature setting circuit.
As shown in figure 1, the output end and resistance R4 of one end connection temperature setting circuit of the resistance R2 of temperature sensing circuit
One end, the inverting input of the other end concatenation operation amplifier IC1 of resistance R2, one end of electric capacity C1 and thermistor R1's
One end.The other end of resistance R4 connects one end of adjustable resistance RP1, and the other end of adjustable resistance RP1 connects one end of resistance R5,
The other end ground connection of resistance R5.The in-phase input end of the adjustable end concatenation operation amplifier IC1 of adjustable resistance RP1.Thermistor
The other end of R1 and the other end of electric capacity C1 are all connected with the output end of operational amplifier IC1 and one end of resistance R3, resistance R3's
The inverting input of other end concatenation operation amplifier IC2 and one end of adjustable resistance RP2.The other end of adjustable resistance RP2 and
The adjustable end of adjustable resistance RP2 and the output end connection of operational amplifier IC2.The in-phase input end connection of operational amplifier IC2
One end of resistance R6, the other end ground connection of resistance R6.The output end connection measurement end of operational amplifier IC2.
Thermistor R1 adopts the RTD indexed as Pt100, operational amplifier IC1 and operational amplifier IC2 to adopt
LM308.Thermistor R1 adopts three-wire system connection, can so reduce the additional mistake that thermistor R1 varies with temperature generation
Difference.Thermistor R1 is connected in the negative feedback loop of operational amplifier IC1, when thermistor R1 is varied with temperature, fortune
The gain for calculating amplifier IC1 changes therewith, so as to the temperature signal that thermistor R1 is experienced is converted into into voltage signal transmission
To operational amplifier IC2.Measurement end is transferred to after reversely being amplified to signal by operational amplifier IC2.
As shown in Fig. 2 voltage+the 6V that one end connection power supply group of the resistance R7 of temperature setting circuit is provided, resistance R7's
The other end connects one end, the anode A of Zener diode D1 and reference level R of resistance R8, while the end of resistance R7 sets for temperature
Determine the output end of circuit.The negative electrode K ground connection of Zener diode D1.The other end of resistance R8 connects one end of adjustable resistance RP3, can
Adjust the other end ground connection of resistance RP3.The adjustable termination setting end of adjustable resistance RP3.
Zener diode D1 adopts TL431.
As shown in figure 3, the homophase input termination setting end of the operational amplifier IC3 in temperature-control circuit, operation amplifier
The anti-phase input termination measurement end of device IC3, the output end of operational amplifier IC3 connects one end of resistance R9.Resistance R9's is another
The negative electrode of end connection diode D2 and the base stage of NPN type triode Q1.The negative electrode of diode D2 and the transmitting of NPN type triode Q1
Pole is all connected with the negative voltage -6V provided by power supply group.The anode and relay of the colelctor electrode connection diode D3 of NPN type triode
One end of K, the negative electrode of diode D3 and the other end of relay K are all connected with the positive voltage+6V provided by power supply group.
The voltage that temperature-control circuit exports temperature sensing circuit is compared with the output voltage of initialization circuit, compares
As a result the state of relay K is determined, realizes temperature value being controlled in setting value.
Operational amplifier IC3 adopts LM308, diode D2 and diode D3 to adopt IN4148.
As shown in figure 4, the V+ ends connection of the analog-digital converter ICL7107CPL in Temperature Treatment circuit is provided by power supply group
+ 6V voltages, one end and one end of electric capacity C4 of the OSC1 ends connection resistance R13 of ICL7107CPL, the other end of resistance R13 connects
The OSC2 ends of ICL7107CPL are connect, the other end of electric capacity C4 connects the OSC3 ends of ICL7107CPL.The AZ ends of ICL7107CPL connect
Connect one end of electric capacity C5, one end and one end of electric capacity C6 of the other end connection resistance R14 of electric capacity C5, the other end of resistance R14
The BUF ends of connection ICL7107CPL, the other end of electric capacity C6 connects the INT ends of ICL7107CPL.
One end and one end of electric capacity C1 of the IN+ ends connection resistance R10 of ICL7107CPL, the other end ground connection of electric capacity C1.
The IN- ends of ICL7107CPL and COM ends are grounded.The other end of resistance R10 connects the movable end of single-pole double-throw switch (SPDT) SA, switchs SA
Two fixing ends respectively set end and measurement end.The end of resistance R10 connects one end of resistance R11 simultaneously, resistance R11's
The other end connects one end of adjustable resistance RP4, and the adjustable end of adjustable resistance RP4 connects the REFLO ends of ICL7107CPL, adjustable electric
The other end of resistance RP4 connects one end of resistance R12, the other end ground connection of resistance R12.
The GND ends ground connection of ICL7107CPL.The V- ends of ICL7107CPL connect one end of electric capacity C2 and are provided by power supply group
- 6V voltages, electric capacity C2 the other end ground connection.The CR- of ICL7107CPL connects one end of electric capacity C3, and the other end of electric capacity C3 connects
Connect the CR+ ends of ICL7107CPL.
Because thermistor R1 adopts RTD, its nonlinear characteristic causes the temperature control of RTD to rise with temperature
And reduce, but using the transfer characteristic of analog-digital converter carried out high-precision linear compensation in the present invention.Wherein, modulus turns
The reference input voltage negative terminal of parallel operation ICL7107CPL（REFLO ends）Current potential be to change with the change of input signal.
When dut temperature is relatively low, the current potential at REFLO ends is relatively low, and because REFHI terminal potentials are fixed, reference voltage is higher, analog-to-digital conversion
The sensitivity of device ICL7107CPL is relatively low.When dut temperature is higher, the current potential that REFLO ends obtain Jing after partial pressure is higher, makes mould
The reference voltage of number converter ICL7107CPL is less, then analog-digital converter ICL7107CPL sensitivity is higher.Because modulus turns
The transfer characteristic of parallel operation ICL7107CPL is just with the temperature control relation of RTD conversely, therefore, it is possible to pass through non-linear school
Positive way makes the nonlinearity erron of measurement and control of temperature instrument circuit very little.
As shown in Figure 1 and Figure 4, the REFHI ends of ICL7107CPL are of coupled connections between adjustable resistance RP1 and resistance R5.
When switch is placed in setting end, adjusting adjustable resistance RP3 can set observing and controlling temperature value, and now LED display shows
Value is the temperature value of setting.Switch SA is placed in into measurement end after the completion of setting.
Temperature sensing circuit is delivered to the analog-digital converter that the signal Jing switch SA of measurement end are transferred to Temperature Treatment circuit
The analog input end of ICL7107CPL, carries out analog-to-digital conversion.Through signal after analog-to-digital conversion can also special delivery to modulus
The enterprising trip temperature of LED display of converter IC L7107CPL connections shows.
The port of components and parts used herein uses according to the content that its databook specifies.
Above-described is only embodiments of the invention, and the general knowledge here such as known concrete structure and characteristic is not made in scheme
Excessive description.It should be pointed out that for a person skilled in the art, on the premise of without departing from present configuration, can be with
Some deformations and improvement are made, these should also be considered as protection scope of the present invention, these are implemented all without the impact present invention
Effect and practical applicability.
Claims (2)
1. a kind of digital temperature observing and controlling instrument circuit, it is characterised in that：Including temperature sensing circuit, the temperature setting being sequentially connected
Circuit, Temperature Treatment circuit and LED display, and the temperature control being connected between temperature sensing circuit and temperature setting circuit
Circuit processed；The temperature sensing circuit includes the operational amplifier IC1 and operational amplifier IC2 being connected with operational amplifier IC1；
Thermistor R1 and electric capacity C1 is parallel with the negative-feedback of operational amplifier IC1；The inverting input of operational amplifier IC1 is passed through
Resistance R2 connects the output end of the temperature setting circuit；Operational amplifier IC1 in-phase input end connection adjustable resistance RP1 and
Resistance R5, connects resistance R4 between adjustable resistance RP1 and the output end of temperature setting circuit；The output end of operational amplifier IC1
Through the inverting input of resistance R3 concatenation operation amplifier IC2, the in-phase input end of operational amplifier IC2 connects through resistance R6
Connecting resistance R5；Serial adjustable resistance RP2 in the negative-feedback of operational amplifier IC2；The output end connection measurement of operational amplifier IC2
End；The adjustable resistance RP3 that temperature setting circuit includes setting end and is connected with setting end；Adjustable resistance RP3 and resistance R8 is constituted
Series arm shunt regulator diode D1；The anode A and reference level R of Zener diode D1 connects resistance R7 simultaneously and temperature sets
Determine the output end of circuit；The positive voltage terminal that resistance R7 connection power supply groups are provided；Temperature-control circuit includes operational amplifier IC3,
The homophase input termination setting end of operational amplifier IC3, the anti-phase input termination measurement end of operational amplifier IC3, operation amplifier
The output end of device IC3 connects the base stage of NPN type triode Q1 through resistance R9；Diode D2 is connected to NPN type triode Q1
Between emitter stage and base stage, the emitter stage of NPN type triode Q1 connects the negative voltage side provided by power supply group；NPN type triode
Colelctor electrode connection diode D3 anode and one end of relay K, the negative electrode of diode D3 and the other end of relay K connect
The positive voltage terminal provided by power supply group is provided.
2. digital temperature observing and controlling instrument circuit according to claim 1, it is characterised in that：Temperature Treatment circuit includes modulus
The positive voltage terminal that the V+ ends connection of converter IC L7107CPL, analog-digital converter ICL7107CPL is provided by power supply group,
One end and one end of electric capacity C4 of the OSC1 ends connection resistance R13 of ICL7107CPL, the other end connection of resistance R13
The OSC2 ends of ICL7107CPL, the other end of electric capacity C4 connects the OSC3 ends of ICL7107CPL；The AZ ends connection of ICL7107CPL
One end of electric capacity C5, one end and one end of electric capacity C6 of the other end connection resistance R14 of electric capacity C5, the other end of resistance R14 connects
The BUF ends of ICL7107CPL are connect, the other end of electric capacity C6 connects the INT ends of ICL7107CPL；The IN+ ends of ICL7107CPL connect
One end of connecting resistance R10 and one end of electric capacity C1, the other end ground connection of electric capacity C1；The IN- ends of ICL7107CPL and COM are terminated
Ground；The movable end of the other end connection single-pole double-throw switch (SPDT) SA of resistance R10 and one end of resistance R11, switch two fixations of SA
End respectively setting end and measurement end；The other end of resistance R11 connects one end of adjustable resistance RP4, and adjustable resistance RP4's is adjustable
The REFLO ends of end connection ICL7107CPL, the other end of adjustable resistance RP4 connects one end of resistance R12, and resistance R12's is another
End ground connection；The GND ends ground connection of ICL7107CPL；The V- ends of ICL7107CPL connect one end of electric capacity C2 and are provided by power supply group
Negative voltage side, electric capacity C2 the other end ground connection；The CR- of ICL7107CPL connects one end of electric capacity C3, the other end of electric capacity C3
The CR+ ends of connection ICL7107CPL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510462509.2A CN105005337B (en) | 2015-07-31 | 2015-07-31 | Digital temperature measuring and controlling instrument circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510462509.2A CN105005337B (en) | 2015-07-31 | 2015-07-31 | Digital temperature measuring and controlling instrument circuit |
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| CN105005337A CN105005337A (en) | 2015-10-28 |
| CN105005337B true CN105005337B (en) | 2017-04-19 |
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| CN201510462509.2A Expired - Fee Related CN105005337B (en) | 2015-07-31 | 2015-07-31 | Digital temperature measuring and controlling instrument circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10117311B2 (en) * | 2016-02-01 | 2018-10-30 | Phoseon Technology, Inc. | Automatic power controller for a plurality of lighting arrays |
| CN105784168A (en) * | 2016-04-01 | 2016-07-20 | 浪潮电子信息产业股份有限公司 | Temperature transmitter |
| CN106248240B (en) * | 2016-08-15 | 2018-12-11 | 成都众山科技有限公司 | A kind of temperature transmitter with temperature-compensating |
| CN109188062A (en) * | 2018-09-04 | 2019-01-11 | 兰州理工大学 | A kind of MMC submodule capacitor voltage detection method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2075797U (en) * | 1990-02-10 | 1991-04-24 | 河南大学 | Automatic controlled monitor for physiotherapy temperature |
| CN2132207Y (en) * | 1992-05-08 | 1993-05-05 | 康视田 | Electronic automatic frost melted device |
| CN2430676Y (en) * | 2000-06-08 | 2001-05-16 | 姜兴海 | Temperature difference automatic temperature control instrument |
| CN204883430U (en) * | 2015-07-31 | 2015-12-16 | 重庆市志益鑫电子科技有限公司 | Appearance circuit is observed and controled to digital temperature |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100738310B1 (en) * | 2006-06-28 | 2007-07-12 | 윤정수 | The electric heat mat controller |
-
2015
- 2015-07-31 CN CN201510462509.2A patent/CN105005337B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2075797U (en) * | 1990-02-10 | 1991-04-24 | 河南大学 | Automatic controlled monitor for physiotherapy temperature |
| CN2132207Y (en) * | 1992-05-08 | 1993-05-05 | 康视田 | Electronic automatic frost melted device |
| CN2430676Y (en) * | 2000-06-08 | 2001-05-16 | 姜兴海 | Temperature difference automatic temperature control instrument |
| CN204883430U (en) * | 2015-07-31 | 2015-12-16 | 重庆市志益鑫电子科技有限公司 | Appearance circuit is observed and controled to digital temperature |
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| CN105005337A (en) | 2015-10-28 |
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