CN109900378A - A kind of digital temperature measurement and control instrument circuit - Google Patents
A kind of digital temperature measurement and control instrument circuit Download PDFInfo
- Publication number
- CN109900378A CN109900378A CN201711300848.6A CN201711300848A CN109900378A CN 109900378 A CN109900378 A CN 109900378A CN 201711300848 A CN201711300848 A CN 201711300848A CN 109900378 A CN109900378 A CN 109900378A
- Authority
- CN
- China
- Prior art keywords
- resistance
- temperature
- operational amplifier
- circuit
- connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention relates to measurement and control of temperature fields.A kind of digital temperature measurement and control instrument circuit, including sequentially connected temperature sensing circuit, temperature setting circuit, Temperature Treatment circuit and LED display, and the temperature-control circuit being connected between temperature sensing circuit and temperature setting circuit.The present invention is not only cheap but also precision is higher.
Description
Technical field
The present invention relates to observation and control technology fields, and in particular to a kind of digital temperature measurement and control instrument circuit.
Background technique
In daily production and life, more and more places need to carry out measurement and control of temperature.But current temperature measurement-control instrument
At polarization.The precision of the comparatively cheap temperature measurement-control instrument of price is lower, 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 exactly suitable for this temperature measurement-control instrument
Temperature measurement-control instrument circuit.
Summary of the invention
The object of the invention provides a kind of digital temperature measurement and control instrument circuit, and to solve, existing measurement and control instrument precision is lower or valence
Lattice costly the problem of.
To achieve the goals above, invention uses a kind of technical solution below: digital temperature measurement and control instrument circuit, packet
Sequentially connected temperature sensing circuit, temperature setting circuit, Temperature Treatment circuit and LED display are included, and is connected to temperature
Temperature-control circuit between detection circuit and temperature setting circuit；The temperature sensing circuit include operational amplifier IC1 and
The operational amplifier IC2 being connect with operational amplifier IC1；Be parallel in the negative-feedback of operational amplifier IC1 thermistor R1 and
Capacitor C1；The inverting input terminal of operational amplifier IC1 connects the output end of the temperature setting circuit by resistance R2；Operation is put
The non-inverting input terminal of big device IC1 connects adjustable resistance RP1 and resistance R5, the output end of adjustable resistance RP1 and temperature setting circuit
Between connect resistance R4；The output end of operational amplifier IC1 passes through the inverting input terminal of resistance R3 connection operational amplifier IC2,
The non-inverting input terminal of operational amplifier IC2 passes through resistance R6 connection resistance R5；It connects in the negative-feedback of operational amplifier IC2 adjustable
Resistance RP2；The output end of operational amplifier IC2 connects measurement end.
Working principle: temperature sensing circuit detects temperature signal and temperature signal is converted to electric signal and is transmitted to temperature
It spends in initialization circuit, signal is transmitted to Temperature Treatment circuit, Temperature Treatment circuit after temperature setting circuit is directly over buffering
Temperature value is shown on LED display after processing signal.Temperature-control circuit is adjusted, telemetry circuit of the present invention can be set
Range.
Beneficial effects of the present invention: 1. temperature sensing circuits, temperature setting circuit, Temperature Treatment circuit and LED display
It is sequentially connected, temperature-control circuit is connected between temperature sensing circuit and temperature setting circuit, structure used in the present invention is simple, institute
It is less with component, therefore cost reduces.2. the temperature sensing circuit includes operational amplifier IC1 and and operational amplifier
The operational amplifier IC2 of IC1 connection；Thermistor R1 and capacitor C1 are parallel in the negative-feedback of operational amplifier IC1；Operation is put
The inverting input terminal of big device IC1 connects the output end of the temperature setting circuit by resistance R2；The same phase of operational amplifier IC1
Input terminal connects adjustable resistance RP1 and resistance R5, connects resistance between adjustable resistance RP1 and the output end of temperature setting circuit
R4；The output end of operational amplifier IC1 passes through the inverting input terminal of resistance R3 connection operational amplifier IC2, operational amplifier IC2
Non-inverting input terminal pass through resistance R6 connection resistance R5；Serial adjustable hinders RP2 in the negative-feedback of operational amplifier IC2；Operation
The output end of amplifier IC2 connects measurement end；It is convenient to detect temperature in time and temperature signal is transmitted to subsequent circuit.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the present invention in order to illustrate more clearly of this hair
Bright embodiment or technical solution in the prior art, below will be p- required for describing the embodiments or the prior art attached
Figure is briefly described, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached 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
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 4: a kind of digital temperature measurement and control instrument circuit, including the inspection of sequentially connected temperature
Slowdown monitoring circuit, temperature setting circuit, Temperature Treatment circuit and LED display, and it is connected to temperature sensing circuit and temperature setting
Temperature-control circuit between circuit；The temperature sensing circuit includes operational amplifier IC1 and connect with operational amplifier IC1
Operational amplifier IC2；Thermistor R1 and capacitor C1 are parallel in the negative-feedback of operational amplifier IC1；Operational amplifier IC1
Inverting input terminal connect the output end of the temperature setting circuit by resistance R2；The non-inverting input terminal of operational amplifier IC1
Adjustable resistance RP1 and resistance R5 is connected, resistance R4 is connected between adjustable resistance RP1 and the output end of temperature setting circuit；Operation
The output end of amplifier IC1 passes through the inverting input terminal of resistance R3 connection operational amplifier IC2, the same phase of operational amplifier IC2
Input terminal passes through resistance R6 connection resistance R5；Serial adjustable hinders RP2 in the negative-feedback of operational amplifier IC2；Operational amplifier
The output end of IC2 connects measurement end.
Working principle: temperature sensing circuit detects temperature signal and temperature signal is converted to electric signal and is transmitted to temperature
It spends in initialization circuit, signal is transmitted to Temperature Treatment circuit, Temperature Treatment circuit after temperature setting circuit is directly over buffering
Temperature value is shown on LED display after processing signal.Temperature-control circuit is adjusted, telemetry circuit of the present invention can be set
Range.
Beneficial effects of the present invention: 1. temperature sensing circuits, temperature setting circuit, Temperature Treatment circuit and LED display
It is sequentially connected, temperature-control circuit is connected between temperature sensing circuit and temperature setting circuit, structure used in the present invention is simple, institute
It is less with component, therefore cost reduces.2. the temperature sensing circuit includes operational amplifier IC1 and and operational amplifier
The operational amplifier IC2 of IC1 connection；Thermistor R1 and capacitor C1 are parallel in the negative-feedback of operational amplifier IC1；Operation is put
The inverting input terminal of big device IC1 connects the output end of the temperature setting circuit by resistance R2；The same phase of operational amplifier IC1
Input terminal connects adjustable resistance RP1 and resistance R5, connects resistance between adjustable resistance RP1 and the output end of temperature setting circuit
R4；The output end of operational amplifier IC1 passes through the inverting input terminal of resistance R3 connection operational amplifier IC2, operational amplifier IC2
Non-inverting input terminal pass through resistance R6 connection resistance R5；Serial adjustable hinders RP2 in the negative-feedback of operational amplifier IC2；Operation
The output end of amplifier IC2 connects measurement end；It is convenient to detect temperature in time and temperature signal is transmitted to subsequent circuit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of digital temperature measurement and control instrument circuit, it is characterised in that: set including sequentially connected temperature sensing circuit, temperature
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 connecting with operational amplifier IC1；
Thermistor R1 and capacitor C1 are parallel in the negative-feedback of operational amplifier IC1；The inverting input terminal of operational amplifier IC1 is passed through
Resistance R2 connects the output end of the temperature setting circuit；Operational amplifier IC1 non-inverting input terminal 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
By the inverting input terminal of resistance R3 connection operational amplifier IC2, the non-inverting input terminal of operational amplifier IC2 connects by resistance R6
Connecting resistance R5；Serial adjustable hinders RP2 in the negative-feedback of operational amplifier IC2；The output end of operational amplifier IC2 connects measurement
End.
2. digital temperature measurement and control instrument circuit according to claim 1, it is characterised in that: temperature setting circuit includes setting
End and the adjustable resistance RP3 being connect with setting end；The series arm shunt regulator diode of adjustable resistance RP3 and resistance R8 composition
D1；The anode A and reference level R of zener diode D1 connects the output end of resistance R7 and temperature setting circuit simultaneously；Resistance R7 connects
The positive voltage terminal of power supply group offer is provided.
3. digital temperature measurement and control instrument circuit according to claim 1, it is characterised in that: temperature-control circuit includes operation
The homophase input termination setting end of amplifier IC3, operational amplifier IC3, the anti-phase input of operational amplifier IC3 terminate measurement
End, the output end of operational amplifier IC3 pass through the base stage of resistance R9 connection NPN type triode Q1；Diode D2 is connected to NPN type
Between the emitter and base stage of triode Q1, the emitter of NPN type triode Q1 connects the negative voltage side provided by power supply group；
The anode of the collector connection diode D3 of NPN type triode and one end of relay K, the cathode and relay K of diode D3
The other end positive voltage terminal provided by power supply group is provided.
4. digital temperature measurement and control instrument circuit according to claim 1, it is characterised in that: Temperature Treatment circuit includes modulus
The end V+ of converter IC L7107CPL, analog-digital converter ICL7107CPL connect the positive voltage terminal provided by power supply group,
One end of the end the OSC1 connection resistance R13 of ICL7107CPL and one end of capacitor C4, the other end connection of resistance R13
The end OSC2 of ICL7107CPL, the end OSC3 of the other end connection ICL7107CPL of capacitor C4；The end AZ of ICL7107CPL connects
One end of capacitor C5, one end of the other end connection resistance R14 of capacitor C5 and one end of capacitor C6, the other end of resistance R14 connect
Connect the end BUF of ICL7107CPL, the end INT of the other end connection ICL7107CPL of capacitor C6；The end IN+ of ICL7107CPL connects
One end of resistance R10 and one end of capacitor C1, the other end ground connection of capacitor C1；The end IN- of ICL7107CPL and the end COM ground connection；
The movable end of the other end connection single-pole double-throw switch (SPDT) SA of resistance R10, two fixing ends of switch SA are respectively to set end and survey
Measure end；The end of resistance R10 connects one end of resistance R11 simultaneously, and the other end of resistance R11 connects one end of adjustable resistance RP4,
The end REFLO of the adjustable end connection ICL7107CPL of adjustable resistance RP4, the one of the other end connection resistance R12 of adjustable resistance RP4
End, the other end ground connection of resistance R12；The end GND of ICL7107CPL is grounded；One end of the end the V- connection capacitor C2 of ICL7107CPL
It is grounded with the other end of the negative voltage side provided by power supply group, capacitor C2；One end of the CR- connection capacitor C3 of ICL7107CPL,
The end CR+ of the other end connection ICL7107CPL of capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711300848.6A CN109900378A (en) | 2017-12-10 | 2017-12-10 | A kind of digital temperature measurement and control instrument circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711300848.6A CN109900378A (en) | 2017-12-10 | 2017-12-10 | A kind of digital temperature measurement and control instrument circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109900378A true CN109900378A (en) | 2019-06-18 |
Family
ID=66941171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711300848.6A Pending CN109900378A (en) | 2017-12-10 | 2017-12-10 | A kind of digital temperature measurement and control instrument circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109900378A (en) |
-
2017
- 2017-12-10 CN CN201711300848.6A patent/CN109900378A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107219402B (en) | A kind of circuit for quick measurement of DC resistance for power module port | |
| CN111722044B (en) | Direct current charging pile testing method, device and equipment based on frequency sweep calibration shunt | |
| CN103487767B (en) | A kind of load driving circuits and electronic load | |
| CN109588785A (en) | A kind of anti-dry control circuit of electronic cigarette | |
| CN207601292U (en) | A kind of abnormal detector of mutual inductor | |
| CN105005337A (en) | Digital temperature measuring and controlling instrument circuit | |
| CN204883430U (en) | Appearance circuit is observed and controled to digital temperature | |
| CN109100052A (en) | A kind of detection circuit of PT100 temperature sensor | |
| CN110850179B (en) | Inductance saturation parameter measuring circuit and device | |
| CN109932076A (en) | A kind of digital temperature measurement and control instrument circuit | |
| CN109900378A (en) | A kind of digital temperature measurement and control instrument circuit | |
| CN109839204A (en) | A kind of digital temperature measurement and control instrument circuit | |
| CN109753092A (en) | A kind of digital temperature measurement and control instrument circuit | |
| CN204989279U (en) | Digit split -core type meter | |
| CN210514568U (en) | Sine excitation source for UPS storage battery detection system | |
| CN109901642A (en) | A kind of intelligent testing temperature circuit device | |
| CN208780365U (en) | A kind of detection circuit of PT100 temperature sensor | |
| CN109724705A (en) | A kind of intelligent testing temperature circuit device | |
| CN212988630U (en) | Temperature acquisition circuit, control panel and electrical equipment | |
| CN203705550U (en) | Thermistor tester | |
| CN110346731B (en) | Battery current detection circuit for communication | |
| CN205691645U (en) | A kind of signal detection system | |
| CN210514584U (en) | Zinc oxide arrester live-line tester | |
| CN211824796U (en) | PT 100-based temperature detection device with broken line detection function | |
| CN107765737A (en) | A kind of intelligent testing temperature circuit arrangement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190618 |
|
| WD01 | Invention patent application deemed withdrawn after publication |