CN108375423A - A kind of temperature collection circuit - Google Patents
A kind of temperature collection circuit Download PDFInfo
- Publication number
- CN108375423A CN108375423A CN201810037527.XA CN201810037527A CN108375423A CN 108375423 A CN108375423 A CN 108375423A CN 201810037527 A CN201810037527 A CN 201810037527A CN 108375423 A CN108375423 A CN 108375423A
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- capacitance
- pin
- series chip
- temperature
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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
- G01K7/22—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 non-linear resistance, e.g. thermistor
- G01K7/24—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 non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
The invention discloses a kind of temperature collection circuits, it is characterised in that:Including thermistor NTC, first resistor RA, second resistance RB, the first capacitance C1 and 555 series chip;Wherein, thermistor NTC first ends connect positive pole, second end connects No. 7 pins of 555 series chip, the first end of first resistor RA connects positive pole, second end connects No. 7 pins of 555 series chip, second resistance RB first ends connect the first capacitance C1 first ends, second end connects No. 7 pins of 555 series chip, first capacitance C1 second ends are grounded, positive pole is also connect with the 4th pin of 555 series chip and the 8th pin, and the first end of the first capacitance C1 is also connected with the 2nd pin of 555 series chip and the 6th pin.This circuit structure is simple and practicable, precision is reliable, it is cheap, volume is flexible, it can be applied to measuring environment temperature or be placed on different location in equipment, the temperature of some specific component can be even acquired and be measured, the interference that can greatly avoid electromagnetic environment complicated inside instrument and equipment from generating collection value, finally enables the accuracy of temperature acquisition result, stability all greatly promote.
Description
Technical field
The present invention relates to temperature acquisition equipment technical fields, and in particular to a kind of temperature collection circuit.
Background technology
In current instrument and equipment, temperature acquisition has become indispensable and extremely important part, in equipment
In operational process, can in real time monitoring of environmental temperature, device temperature, even some device temperature value, for the normal of equipment
Operation and protection all play the role of vital.
Currently, temperature acquisition generally there is several methods that.The physical methods such as mercury formula, infrared remote sensing thermal imaging skill, temperature
Sensor acquisition method etc..And above method more or less all has some disadvantages.
Wherein, the physical methods such as mercury formula are the thermal expansion characters for utilizing the liquid such as mercury, kerosene, closed by processing
In in a constant volume device, known otherwise eventually by artificial naked eyes to read ambient temperature value.The method it is although simple and practicable and
It is of low cost, but due to needing artificial naked eyes to read identification, precision is relatively low, simultaneously as being influenced by structural style, very
Hardly possible is applied to specific equipment, the temperature acquisition environment of device.
Infrared remote sensing thermal imaging is the spectral characteristic using different temperatures, is acquired by special lighting apparatus specific
The light wave in region, position, and by the image of software algorithm formation temperature, color of image can be compared taking human as naked eyes and read temperature
Value, can also pass through software real-time display temperature value.Although convenient operated, simultaneously by imaging technique, operating distance, behaviour
Making the influence of angle etc., to eventually lead to precision not high, and the most important is that its cost is high, seriously limits this side
The concrete application of method.
And mesh, what is widely applied at present is the direct acquisition method of temperature sensor, that is, applies temperature sensor in not equality of temperature
Generated analog quantity directly reflects actual temp value when spending.This method is simple and practicable, precision is reliable, but in application process
In, analog quantity caused by temperature sensor is highly susceptible to other signal interferences, when being particularly applied to inside instrument and equipment,
Complicated electromagnetic environment can generate uncontrollable interference to collection value, finally enable accuracy, the stability of temperature acquisition result
All have a greatly reduced quality.
Invention content
Based on the deficiencies of the prior art, the purpose of the present invention is to provide a kind of simple and practicable, reliable temperature of precision to adopt
Collector, solve temperature acquisition during analog quantity easily interfered by other signals, enable the accuracy and stability of temperature acquisition
Impacted problem.
To achieve the above object, the technical scheme is that:
A kind of temperature collection circuit, it is characterised in that:Including thermistor NTC, first resistor RA, second resistance RB,
One capacitance C1 and 555 series chip;Wherein, thermistor NTC first ends connect positive pole, and second end connects 555 series core
The first end of No. 7 pins of piece, first resistor RA connects positive pole, and second end connects No. 7 pins of 555 series chip, the
Two resistance RB first ends connect the first capacitance C1 first ends, and second end connects No. 7 pins of 555 series chip, the first capacitance C1
Second end is grounded, and positive pole is also connect with the 4th pin of 555 series chip and the 8th pin, and the first end of the first capacitance C1 is also
Connect the 2nd pin of 555 series chip and the 6th pin.
Further, temperature collection circuit further includes that the second capacitance C2, the second capacitance C2 is connected to 555 series chip
The 5th pin and ground between.
Further, temperature collection circuit further includes third capacitance C3, and the first end of the third capacitance C3 connects power supply
Anode, the second end ground connection of the third capacitance C3.
Beneficial effects of the present invention are:Circuit structure is simple and practicable, and precision is reliable, cheap, volume is flexible, Ke Yiying
For measuring environment temperature or be placed on different location in equipment, the temperature of some specific component can be even acquired and
It measures, the interference that can greatly avoid electromagnetic environment complicated inside instrument and equipment from generating collection value finally enables temperature acquisition
As a result accuracy, stability all greatly promotes.
Description of the drawings
Fig. 1 is the electrical block diagram of the specific embodiment of the invention;
Fig. 2 is the output low and high level and No. 6 pins of No. 3 pins of the 555 series chip of the specific embodiment of the invention
Relational graph between input voltage.
Specific implementation mode
The technique effect of the design of the present invention, concrete structure and generation is carried out below with reference to embodiment and attached drawing clear
Chu is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair
Bright a part of the embodiment, rather than whole embodiments, those skilled in the art is without creative efforts
The other embodiment obtained, belongs to the scope of protection of the invention.
As shown in Figure 1, a kind of temperature collection circuit, including thermistor NTC, first resistor RA, second resistance RB, first
Capacitance C1, the second capacitance C2, third capacitance C3 and 555 series chip;Wherein, thermistor NTC first ends connect positive pole,
Second end connects No. 7 pins of 555 series chip, and the first end of first resistor RA connects positive pole, and second end connects 555 systems
No. 7 pins of row chip, second resistance RB first ends connect the first capacitance C1 first ends, and second end connects the 7 of 555 series chip
Number pin, the first capacitance C1 second ends ground connection, positive pole are also connect with the 4th pin of 555 series chip and the 8th pin, the
The first end of one capacitance C1 is also connected with the 2nd pin of 555 series chip and the 6th pin.The second capacitance C2 is connected to 555 series
Between the 5th pin and ground of chip.The first end connection positive pole of the third capacitance C3, the second of the third capacitance C3
End ground connection.
555 series timer chip is a kind of medium-scale integration device that analog- and digital- function is combined, at low cost, property
It can be reliable, it is only necessary to external several resistance, capacitance, so that it may to realize multivibrator, monostable flipflop and schmidt trigger
Device isopulse generates and translation circuit.It also frequently as timer be widely used in instrument and meter, household electrical appliance, electronic surveying and
Automatically control etc..
555 series timer chip works in multivibrator pattern in Fig. 1, and No. 3 pin output waveforms of chip are according to 6
Number pin voltage value determines.As shown in Fig. 2, in figure, output indicates that the low and high level of No. 3 pins output, Threshold indicate
The voltage condition of No. 6 pins, when No. 6 pin voltages rise to 2Vcc/3, No. 3 pins export low level, when No. 6 pin voltages
When dropping to Vcc/3, No. 3 pins export high level.In this way, an arteries and veins will be exported in No. 3 pins of 555 series timer chip
Rush waveform.It is the resistance value after RA in parallel with thermistor NTC to define R, thenTherefore, 555 system described above
No. 3 pin output pulse waveforms of row timer chip
FrequencyAnd impulse waveform
Duty ratio
The numerical value of R is substituted into above-mentioned formula, obtains output pulse waveform
FrequencyImpulse waveform
Duty ratio
The voltage value of No. 6 pins of 555 series timer chip will be influenced by thermistor NTC resistance values, that is, can
It is influenced by tested testing temperature.The frequencies of No. 3 pin output pulse waveforms of 555 series timer chip, duty ratio all with NTC
Resistance value establishes direct relationship, by the frequency of output pulse waveform, duty ratio, will obtain dut temperature
Exact value.In this way, a correspondence from temperature value to impulse waveform duty ratio will be realized, by 555 series timer
The pulse signal TempPulse of No. 3 pins of chip output is sent to DSP etc. and receives control device, is established by these control devices
The frequency of above-mentioned output pulse waveform, the mathematical formulae of duty ratio.When detecting specific frequency, duty ratio, so that it may with logical
Real-time accurate temperature numerical value is calculated in the immobilising device value for crossing formula and actual circuit.And compared to temperature sensor
For analog signal, the anti-interference ability of this pulse signal will greatly improve.
It should be noted that described above is presently preferred embodiments of the present invention, the invention is not limited in above-mentioned
Embodiment should all belong to the scope of protection of the present invention as long as it reaches the technique effect of the present invention with identical means.
Claims (3)
1. a kind of temperature collection circuit, it is characterised in that:Including thermistor NTC, first resistor RA, second resistance RB, first
Capacitance C1 and 555 series chip;Wherein, thermistor NTC first ends connect positive pole, and second end connects 555 series chip
No. 7 pins, the first end of first resistor RA connects positive pole, and second end connects No. 7 pins of 555 series chip, second
Resistance RB first ends connect the first capacitance C1 first ends, and second end connects No. 7 pins of 555 series chip, the first capacitance C1 the
Two ends are grounded, and positive pole is also connect with the 4th pin of 555 series chip and the 8th pin, and the first end of the first capacitance C1 also connects
Connect the 2nd pin of 555 series chip and the 6th pin.
2. temperature collection circuit as described in claim 1, it is characterised in that:Further include the second capacitance C2, second capacitance
C2 is connected between the 5th pin of 555 series chip and ground.
3. temperature collection circuit as described in claim 1, it is characterised in that:Further include third capacitance C3, the third capacitance
The first end of C3 connects positive pole, the second end ground connection of the third capacitance C3.
Priority Applications (1)
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CN201810037527.XA CN108375423A (en) | 2018-01-16 | 2018-01-16 | A kind of temperature collection circuit |
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CN201810037527.XA CN108375423A (en) | 2018-01-16 | 2018-01-16 | A kind of temperature collection circuit |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201555670U (en) * | 2009-09-29 | 2010-08-18 | 上海第二工业大学 | Temperature measuring circuit |
US20110279055A1 (en) * | 2010-05-11 | 2011-11-17 | Arkalumen Inc. | Control apparatus with calibration functionality and lighting apparatus incorporating control apparatus |
CN104270859A (en) * | 2014-09-25 | 2015-01-07 | 聊城市科特祥瑞新能源有限公司 | Solar lighting controller |
CN204740076U (en) * | 2015-06-07 | 2015-11-04 | 林碧琴 | Make things convenient for circuit of perception temperature |
CN206741423U (en) * | 2017-05-25 | 2017-12-12 | 浙江同力信息科技有限公司 | A kind of computer host box |
CN208026393U (en) * | 2018-01-16 | 2018-10-30 | 珠海创思新能源科技有限公司 | A kind of temperature collection circuit |
-
2018
- 2018-01-16 CN CN201810037527.XA patent/CN108375423A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201555670U (en) * | 2009-09-29 | 2010-08-18 | 上海第二工业大学 | Temperature measuring circuit |
US20110279055A1 (en) * | 2010-05-11 | 2011-11-17 | Arkalumen Inc. | Control apparatus with calibration functionality and lighting apparatus incorporating control apparatus |
CN104270859A (en) * | 2014-09-25 | 2015-01-07 | 聊城市科特祥瑞新能源有限公司 | Solar lighting controller |
CN204740076U (en) * | 2015-06-07 | 2015-11-04 | 林碧琴 | Make things convenient for circuit of perception temperature |
CN206741423U (en) * | 2017-05-25 | 2017-12-12 | 浙江同力信息科技有限公司 | A kind of computer host box |
CN208026393U (en) * | 2018-01-16 | 2018-10-30 | 珠海创思新能源科技有限公司 | A kind of temperature collection circuit |
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Application publication date: 20180807 |
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