CN209495779U - A kind of multi-functional temp measuring instrument circuit - Google Patents
A kind of multi-functional temp measuring instrument circuit Download PDFInfo
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- CN209495779U CN209495779U CN201920576766.2U CN201920576766U CN209495779U CN 209495779 U CN209495779 U CN 209495779U CN 201920576766 U CN201920576766 U CN 201920576766U CN 209495779 U CN209495779 U CN 209495779U
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- integrated circuit
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- measuring instrument
- temp measuring
- temperature
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Abstract
The utility model discloses a kind of multi-functional temp measuring instrument circuits, including resistance R, R1-R4, capacitor C1-C3, switch S and Integrated circuit IC 1-IC3；Power supply VCC crosses respectively Integrated circuit IC 1-IC3 power supply by capacitor C1-C3 filtering voltage regulation；Integrated circuit IC 1-IC2 is respectively used to the temperature acquisition of determinand, and the thermometric output voltage of Integrated circuit IC 1-IC2 successively distinguishes inverting input terminal, the non-inverting input terminal of input ic IC3；The output end of Integrated circuit IC 3 is connect with LCD gauge outfit；Switch S controls the thermometric output voltage of Integrated circuit IC 1, for realizing the selection of temperature and differential temperature survey；The utility model both may be implemented temp sensing function, differential temperature survey function also may be implemented by switch selection, easy to use；Circuit mostly uses integrated component, and structure is simple, convenient for production and debugging.
Description
Technical field
The utility model relates to arrive technical field of temperature measurement more particularly to a kind of multi-functional temp measuring instrument circuit.
Background technique
Temperature measuring set is for measuring temperature, and usually contact temperature-measuring measuring instrument has simple, reliable, measurement
The advantages that precision is higher, but existing temperature measuring set only has temperature measurement function mostly, needs when needing to measure the temperature difference
To pass through cumbersome process, it has not been convenient to which the use of people, therefore, the prior art is defective, needs to improve.
Utility model content
The utility model provides a kind of multi-functional temp measuring instrument circuit, the above problem of solution.
To solve the above problems, the technical scheme that the utility model is provided is as follows:
A kind of multi-functional temp measuring instrument circuit, including resistance R, R1-R4, capacitor C1-C3, switch S and integrated circuit
IC1-IC3；Power supply VCC crosses respectively Integrated circuit IC 1-IC3 power supply by capacitor C1-C3 filtering voltage regulation；Integrated circuit IC 1-
IC2 is respectively used to the temperature acquisition of determinand, and the thermometric output voltage of Integrated circuit IC 1-IC2 successively distinguishes input ic
Inverting input terminal, the non-inverting input terminal of IC3；The output end of Integrated circuit IC 3 is connect with LCD gauge outfit；Switch S controls integrated circuit
The thermometric output voltage of IC1, for realizing the selection of temperature and differential temperature survey.
Preferred technical solution, power supply VCC are DC5V direct current coin shape voltage source.
Preferred technical solution, Integrated circuit IC 1-IC2 are LM45C type integrated temperature sensor.
Preferred technical solution, Integrated circuit IC 3 are CA3145 type differential amplifier.
The resistance value of preferred technical solution, resistance R1-R4 is equal.
Beneficial effect compared with the existing technology is, using the above scheme, the utility model, both can be with by switch selection
It realizes temp sensing function, differential temperature survey function also may be implemented, it is easy to use；Circuit mostly uses integrated component, and structure is simple, just
In production and debugging.
Detailed description of the invention
Illustrate embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment or the prior art
The required attached drawing used is briefly described in description, it is clear that, the accompanying drawings in the following description is only the one of utility model
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of circuit diagram of multi-functional temp measuring instrument circuit of the utility model.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different
Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this
The understanding of the disclosure of utility model is more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term used in this specification " fixation ", " integrated molding ",
For illustrative purposes only, the similar unit of structure is to identical label in the figure for "left", "right" and similar statement
Mark.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification
Language, which is only for the purpose of describing specific embodiments, is not intended to limitation the utility model.
As shown in Figure 1, one embodiment of the utility model is:
A kind of multi-functional temp measuring instrument circuit, including resistance R, R1-R4, capacitor C1-C3, switch S and integrated circuit
IC1-IC3；Power supply VCC crosses respectively Integrated circuit IC 1-IC3 power supply by capacitor C1-C3 filtering voltage regulation；Integrated circuit IC 1-
IC2 is respectively used to the temperature acquisition of determinand, and the thermometric output voltage of Integrated circuit IC 1-IC2 successively distinguishes input ic
Inverting input terminal, the non-inverting input terminal of IC3；The output end of Integrated circuit IC 3 is connect with LCD gauge outfit；Switch S controls integrated circuit
The thermometric output voltage of IC1, for realizing the selection of temperature and differential temperature survey.
Specifically, power supply VCC respectively with the first end of capacitor C1-C3, the 1st pin of Integrated circuit IC 1-IC2, integrated electricity
The power end of road IC3 connects；2nd pin of Integrated circuit IC 1 is connect with the first end of the first end of switch S, resistance R1 respectively；
The second end of resistance R1 is connect with the inverting input terminal of the first end of resistance R2, Integrated circuit IC 3 respectively；The second end of resistance R2
It is connect respectively with the input terminal of the first end of resistance R, the output end of Integrated circuit IC 3, LCD gauge outfit；The 2nd of Integrated circuit IC 2
Pin is connect with the first end of resistance R3；The second end of resistance R3 respectively with the first end of resistance R4, the same phase of Integrated circuit IC 3
Input terminal connection；The second end of capacitor C1-C3, the second end of switch S, the second end of resistance R, R4, Integrated circuit IC 1-IC2
3rd pin, Integrated circuit IC 3 ground terminal be grounded.
Wherein, power supply VCC is DC5V direct current coin shape voltage source；Integrated circuit IC 1-IC2 is LM45C type integrated temperature
Sensor；Preferred technical solution, Integrated circuit IC 3 are CA3145 type differential amplifier；The resistance value of resistance R1-R4 is equal.
LM45C type integrated temperature sensor has the advantage that
LM45 series is sophisticated integrated circuits temperature sensor, output voltage and the linear ratio of temperature (Celsius) Celsius
Example.LM45 does not need any external calibration or fine tuning, can provide ± 2 °C of precision at room temperature, -20 to+100 °C entire
Within the temperature range of ± 3 °C of precision is provided.Ensure low cost by the finishing and calibration of wafer scale.The low output of LM45 hinders
Anti-, linear convergent rate and accurate intrinsic calibration with the interface of reading or control circuit so that be particularly easy to.It can be with single electricity
Source is used together, and can also be used together with positive-negative power.Since its electrical source consumption is only 120 μ A, generate heat naturally non-
Often low, the self-heating temperature in still air is lower than 0.2 °C.The operating temperature ratings range of LM45 is -20 ° to+100 °C.
(1) output voltage is directly proportional to Celsius temperature, and sensitivity is 10mV/ DEG C.
(2) without adjustment and calibration.
(3) it uses and carries out collimation technique on chip, it is at low cost, it is cheap.
(4) operating voltage range is 4-10V, representative value 5V.
(5) quiescent current is small.
(6) outer dimension is small, can be used for long distance temperature measurement and control.
Working principle of the utility model is:
Two integrated temperature sensor LM45C and a differential amplification being made of amplifier CA3145 have been used in the circuit
Device.The thermometric output voltage of IC1 and IC2 inputs the inverting input terminal and non-inverting input terminal of IC3 respectively.Due to R1=R2=R3=R4,
So output voltage UO=UT1-UT2.In formula, UT1, UT2 are respectively the output voltage of two integrated temperature sensors.If pressing
S, then UT1=0, UO output voltage are equivalent to voltage UT2 namely temperature T2.
It should be noted that above-mentioned each technical characteristic continues to be combined with each other, the various embodiments not being enumerated above are formed,
It is accordingly to be regarded as the range of the utility model specification record；Also, it for those of ordinary skills, can be according to above stating
It is bright to be improved or converted, and all these modifications and variations all should belong to the protection model of the appended claims for the utility model
It encloses.
Claims (5)
1. a kind of multi-functional temp measuring instrument circuit, which is characterized in that including resistance R, R1-R4, capacitor C1-C3, switch S sum aggregate
At IC circuit 1-IC3；Power supply VCC crosses respectively Integrated circuit IC 1-IC3 power supply by capacitor C1-C3 filtering voltage regulation；Integrated electricity
Road IC1-IC2 is respectively used to the temperature acquisition of determinand, and the thermometric output voltage of Integrated circuit IC 1-IC2 successively distinguishes input set
At the inverting input terminal of IC circuit 3, non-inverting input terminal；The output end of Integrated circuit IC 3 is connect with LCD gauge outfit；Switch S domination set
At the thermometric output voltage of IC circuit 1, for realizing the selection of temperature and differential temperature survey.
2. a kind of multi-functional temp measuring instrument circuit according to claim 1, which is characterized in that power supply VCC is that DC5V is straight
Flow coin shape voltage source.
3. a kind of multi-functional temp measuring instrument circuit according to claim 1, which is characterized in that Integrated circuit IC 1-IC2
It is LM45C type integrated temperature sensor.
4. a kind of multi-functional temp measuring instrument circuit according to claim 1, which is characterized in that Integrated circuit IC 3 is
CA3145 type differential amplifier.
5. a kind of multi-functional temp measuring instrument circuit according to claim 1-4, which is characterized in that resistance R1-
The resistance value of R4 is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920576766.2U CN209495779U (en) | 2019-04-25 | 2019-04-25 | A kind of multi-functional temp measuring instrument circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920576766.2U CN209495779U (en) | 2019-04-25 | 2019-04-25 | A kind of multi-functional temp measuring instrument circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209495779U true CN209495779U (en) | 2019-10-15 |
Family
ID=68157711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920576766.2U Expired - Fee Related CN209495779U (en) | 2019-04-25 | 2019-04-25 | A kind of multi-functional temp measuring instrument circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209495779U (en) |
-
2019
- 2019-04-25 CN CN201920576766.2U patent/CN209495779U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210104 Address after: 3 / F, building D4, Juyin Technology Industrial Park, No.1 Ganli Road, Jihua street, Longgang District, Shenzhen, Guangdong 518000 Patentee after: SHENZHEN LENZOD ELECTRONIC Co.,Ltd. Address before: 504-1, block a, building 7, Ronghu century garden, No.8, Qiyang Road, fuchengao community, Pinghu street, Longgang District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN ZHAOYIN TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191015 Termination date: 20210425 |