CN101118190A - Temperature measurement device and process for measuring temperature with device - Google Patents
Temperature measurement device and process for measuring temperature with device Download PDFInfo
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- CN101118190A CN101118190A CNA2007100693518A CN200710069351A CN101118190A CN 101118190 A CN101118190 A CN 101118190A CN A2007100693518 A CNA2007100693518 A CN A2007100693518A CN 200710069351 A CN200710069351 A CN 200710069351A CN 101118190 A CN101118190 A CN 101118190A
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Abstract
The present invention relates to a temperature measurement device, which comprises a CPU main control chip, a power supply, a crystal oscillator circuit, a temperature measurement circuit and an additional function circuit which are connected with the CPU main control chip. The present invention is characterized in that the temperature measurement circuit comprises an NE555 timer, a standard resistor R2, a thermal resistance R1, a capacitance C4, wherein after being connected with the standard resistance R2 and a thermal resistance R1 in series, an external stabilized power supply is electrically connected with a sixth pin of the NE555 timer, after being connected with the standard resistance R2, the thermal resistance R1 and the capacitance C4, the external stabilized power supply is grounded, a second pin of the NE555 timer is used as a trigger signal input terminal, and a third pin of the NE555 timer is used as an impulse signal output terminal; with the help of the temperature measurement method of the temperature measurement device, and through searching the segment of the output impulse width tw of the NE555 in the corresponding table of the impulse width t and the temperature T prestored in the CPU main control chip, the actual temperature value is obtained through linear computation; compared with the prior art, the cost of the temperature measurement device is low, the circuit structure is simple and stable, the temperature measurement sensitivity is high, and the measured temperature value is high, and can reach 0.05 DEG C.
Description
Technical field
The present invention relates to a kind of temperature measuring equipment and utilize this device to carry out thermometric method.
Background technology
In worker, agricultural production and daily life, to the measurement of temperature and control in occupation of status of crucial importance.The thermistor that semiconductor material is made is that temperature variation is shown highstrung resistive element, because the charge carrier number in the semiconductor raises with temperature and increases sharply by index law, temperature is high more, the number of charge carrier is many more, conductive capability is strong more, resistivity is also just more little, so thermistor is along with the rising of temperature, and its resistance will reduce rapidly by index law.Be referred to as negative temperature coefficient-Negative Temperature Coefficient (NTC) thermistor, the subtle change of its energy measurement temperature, and have high sensitivity, volume is little, resistance value is big, low price, the life-span is long, use characteristics such as simple.Therefore, it all is widely used at aspects such as thermometry, radiotelegraphy, robotization and remote controls.
At present, most temperature measuring equipment is owing to consider the factor of circuit cost, all adopt Single Chip Microcomputer (SCM) system to add temperature-sensitive resistance and add annex circuit composition, thereby Single Chip Microcomputer (SCM) system is converted to concrete temperature value by the resistance of thermistor handles, thereby reach the purpose of measuring temperature.In certain temperature range, it between the resistance of NTC thermistor and the temperature index relation, utilize the resistance of the current resistance of NTC thermistor to calculate the method for Current Temperatures, need separate logarithmic equation, this class logarithmic equation efficient of system-computed that with the single-chip microcomputer is processor is very low, sensitivity is not high, is unfavorable for applying.In order to reduce complexity of calculation, people proposed a kind of in certain temperature range by in processor of single chip computer, storing the contrast table of a series of correlation parameters that under Current Temperatures, cause by temperature and thermistor in advance, in the actual thermometric process, processor of single chip computer calculates the currency of the correlation parameter that thermistor causes under Current Temperatures, obtain the approximate value of Current Temperatures by the method for tabling look-up.For example publication number is that the Chinese utility model patent " remote control circuitry that the temperature survey function is arranged " of CN2658864 (patent No. is ZL03230656.3) has just been announced a kind of like this temperature measuring circuit.This temperature measuring circuit adopts PMOS or cmos switch pipe, measuring resistance, thermistor and electric capacity, by the discharge of original microprocessor control capacitance and by measuring resistance or thermistor charging, by the microprocessor internal counter records duration of charging, with the ratio of the chargometer numerical value of computed in software measuring resistance and thermistor, obtain current measurement temperature with lookup table mode.Though the measuring method that the said temperature metering circuit is used makes the computation complexity of processor decrease, but following weak point is arranged still: the one, the temperature value measured precision is not high, because the temperature of measuring is the approximate value that obtains by the mode of tabling look-up, consider the capacity of microprocessor internal memory, the ratio and the corresponding tables between the temperature that are stored in advance in the microprocessor can not be exhaustive, make that like this precision of temperature value can not be very high, and the ratio of actual ratio and storage is approximately equal also, and the temperature that obtains also is an approximate value.The 2nd, sensitivity is not high, when each thermometric, processor need calculate the time that electric capacity charges respectively by measuring resistance and thermistor, and processor also needs the ratio of the chargometer numerical value of basis of calculation resistance and thermistor, and the corresponding tables by ratio and temperature finds out the pairing approximate temperature value of current ratio then; Each thermometric processor all needs the ratio of the chargometer numerical value of basis of calculation resistance and thermistor, and this has increased burden equally concerning processor.
Summary of the invention
It is low that first technical matters to be solved by this invention provides a kind of cost, the temperature measuring equipment of circuit structure simple and stable.
The further technical matters to be solved of the present invention is to utilize said apparatus that a kind of precision height is provided, calculate thermometry fast.
The present invention solves the technical scheme that above-mentioned first technical matters adopts: this temperature measuring equipment, include: the CPU main control chip, the power supply and the crystal oscillating circuit that are electrically connected mutually with the CPU main control chip, temperature measurement circuit, the additional function circuit, it is characterized in that: described temperature measurement circuit includes the NE555 timer, measuring resistance, thermistor, electric capacity, wherein external power supply and measuring resistance, thermistor series connection back is electrically connected mutually with the 6th pin of NE555 timer, external power supply and measuring resistance, thermistor, ground connection after the capacitances in series, the 2nd pin of NE555 timer is that the trigger pip input end is electrically connected mutually with the trigger pip output pin of CPU main control chip, and the 3rd pin of NE555 timer is that pulse signal output end is electrically connected mutually with the pulse signal detection pin of CPU main control chip.
In actual applications, have two additional function circuit often to use, the running parameter that is used to be provided with whole apparatus system comprises the light isolation module of the scope of measuring temperature etc. and prevents that actual temperature from exceeding the scope of measuring temperature and being set to the relay module that whole device closes electric treatment.
In order to save cost, in the said temperature measurement mechanism, the CPU main control chip adopts the little process chip of single-chip microcomputer, voltage stabilizing chip employing model is the three-terminal voltage-stabilizing chip of 78L05 in described power supply and the crystal oscillating circuit, can be single-chip microcomputer provides the stabilized voltage supply of 5V, the frequency of its crystal oscillator element is 12M, makes that CPU main control chip impulsive measurement minimum time is 1us.
The present invention solves above-mentioned second technical scheme that technical matters adopted: the method for utilizing the said temperature measurement device measures temperature, it is characterized in that: the numerical value of the pulse signal output end output of NE555 timer is output pulse width t, its voltage that is expressed as electric capacity in the temperature measurement circuit is raised to three of the external power supply voltage/two o'clock required time from above freezing, comprises following steps with the method for above-mentioned temperature measurement device:
Step 1: the scope of this device measured temperature is expressed as T
1To T
n, with T
1To T
nBe divided into the n-1 section, [T
1, T
2), [T
2, T
3), [T
3, T
4) ... [T
(n-1), T
n);
Step 2: measure thermistor respectively at T
1, T
2, T
3... T
nDuring temperature, the output pulse width t of NE555
1, t
2, t
3... t
nBe total to n value.
Step 3: set up the corresponding tables of pulse width t and temperature T, and be stored in the CPU main control chip.
Step 4: think that pulse width t and temperature T are linear in that each section is approximate.According to (t
(n-1), T
(n-1)), (t
n, T
n) set up pulse width t and temperature T pairing linear equation in every section.
Step 5: the pulse width t that searches actual measurement
wThe place section.
Step 6: according to actual pulse width t
wThe linear equation of place section is obtained actual pulse width t
wPairing temperature value.
Step 7: repeating step five, step 65 times calculate the temperature-averaging value of measuring for 5 times.
The precision of measuring temperature by said method can reach 0.05 ℃, and linear calculating of look-up table and secondary do not need complex mathematical to calculate, and measuring method is effective fast.
Compared with prior art, the invention has the advantages that: the one, temperature measurement circuit adopts the NE555 timer cycle to provide measuring resistance and thermistor to capacitor charging time to the CPU main control chip in the temperature measuring equipment, the circuit structure simple and stable, and the CPU main control chip adopts single-chip microcomputer, the frequency of crystal oscillator element is 12MHz, make that CPU main control chip impulsive measurement minimum time is 1us, make that this temperature measuring equipment cost is low, temperature is surveyed highly sensitive; The 2nd, utilize the said temperature measurement mechanism to carry out in the thermometric method, by the temperature value of tabling look-up and the linear Calculation Method of secondary obtains, degree of accuracy can reach 0.05 ℃, and linear calculating of look-up table and secondary do not need complicated calculating, makes temp measuring method effective fast.
Description of drawings
Fig. 1 is the schematic block circuit diagram of embodiment of the invention temperature measuring equipment.
Fig. 2 is a temperature measurement circuit connection layout among Fig. 1.
Fig. 3 is power supply and a crystal oscillating circuit connection layout among Fig. 1.
Fig. 4 is the circuit connection diagram of temperature measurement circuit, power supply and crystal oscillating circuit among Fig. 1, additional function circuit and CPU main control chip.
Fig. 5 is temperature measurement circuit capacitance voltage and output voltage waveform under the trigger pip effect in the embodiment of the invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Fig. 1～Fig. 5 is an embodiment of temperature measuring equipment of the present invention.
This temperature measuring equipment comprises: CPU main control chip 1, and power supply that is electrically connected mutually with the CPU main control chip and crystal oscillating circuit 3, temperature measurement circuit 2, additional function circuit 4, the additional function circuit comprises light isolation module and relay module; CPU main control chip 1 adopts the little process chip of single-chip microcomputer, and adopting model in the present embodiment is the single-chip microcomputer of SST89V554; Voltage stabilizing chip employing model is the three-terminal voltage-stabilizing chip of 78L05 in power supply and the crystal oscillating circuit, for single-chip microcomputer provides 5V stabilized voltage supply, the frequency of its crystal oscillator element is 12MHz, the impulsive measurement minimum time is 1us, ground connection after the crystal oscillator element is connected with capacitor C 66, the other end is electrically connected mutually with the 18th pin of single-chip microcomputer SST89V554; Temperature measurement circuit includes the NE555 timer, measuring resistance R2 resistance is 4500 ohm, resistance is 10000 ohm under the thermistor R1 normal temperature, capacitor C 4 adopts 1uF electric capacity, wherein external voltage stabilizing 5V power supply and measuring resistance R2, thermistor R1 series connection back is electrically connected mutually with the 6th pin of NE555 timer, external voltage stabilizing 5V power supply and measuring resistance R2, thermistor R1, capacitor C 4 series connection back ground connection, the 2nd pin of NE555 timer is as the trigger pip input end, be electrically connected mutually with the 1st pin of single-chip microcomputer SST89V554, the 3rd pin of NE555 timer is electrically connected with the 14th pin of single-chip microcomputer SST89V554 mutually as pulse signal output end; The light isolation module of additional function circuit is electrically connected mutually with the 10th, 11 pins of single-chip microcomputer SST89V554 respectively, and relay module is electrically connected mutually with the 2nd pin of single-chip microcomputer SST89V554.
Through measuring, the numerical value of the pulse signal output end output of NE555 timer is output pulse width t, and its voltage that is expressed as capacitor C 4 is raised to three of the external power supply voltage/two o'clock required time from above freezing.
By changing the size of R2, R1, C4, can change the scope of temperature measurement device, the temperature measuring equipment in the foregoing description can be measured the temperature in-10 ℃～50 ℃ scopes.
Utilize the said temperature measurement mechanism, carry out thermometric method and comprise following steps:
Step 1: said apparatus measured temperature scope-10 ℃～50 ℃ is divided into 60 sections, [10 ,-9), [9 ,-8), [8 ,-7] ... [48,49], 49,50];
Step 2: measure thermistor respectively at-10 ℃ ,-9 ℃ ,-8 ℃ ... in the time of 50 ℃, the output pulse width t of NE555
-10, t
-9, t
-8T
49, t
50Totally 61 values.
Step 3: set up the corresponding tables of pulse width t and temperature T, and be stored in the CPU main control chip, corresponding tables is as shown in the table.
The corresponding tables of pulse width t and temperature T
| Temperature T (℃) | Pulse width t (us) | Temperature T (℃) | Pulse width t (us) | Temperature T (℃) | Pulse width t (us) |
| -10 | 62286 | 11 | 22620 | 32 | 11311 |
| -9 | 58938 | 12 | 21727 | 33 | 11029 |
| -8 | 55808 | 13 | 20884 | 34 | 10760 |
| -7 | 52880 | 14 | 20089 | 35 | 10506 |
| -6 | 50140 | 15 | 19339 | 36 | 10263 |
| -5 | 47576 | 16 | 18630 | 37 | 10033 |
| -4 | 45173 | 17 | 17961 | 38 | 9814 |
| -3 | 42922 | 18 | 17328 | 39 | 9605 |
| -2 | 40812 | 19 | 16730 | 40 | 9406 |
| -1 | 38833 | 20 | 16164 | 41 | 9217 |
| 0 | 36976 | 21 | 15629 | 42 | 9037 |
| 1 | 35233 | 22 | 15122 | 43 | 8867 |
| 2 | 33596 | 23 | 14643 | 44 | 8707 |
| 3 | 32058 | 24 | 14189 | 45 | 8557 |
| 4 | 30613 | 25 | 13759 | 46 | 8287 |
| 5 | 29254 | 26 | 13351 | 47 | 8167 |
| 6 | 27975 | 27 | 12965 | 48 | 8058 |
| 7 | 26772 | 28 | 12599 | 49 | 7959 |
| 8 | 25639 | 29 | 12251 | 50 | 7870 |
| 9 | 24573 | 30 | 11921 | ||
| 10 | 23567 | 31 | 11608 |
Step 4: think pulse width and temperature line relationship in that each section is approximate.Set up pulse width at t and the pairing linear equation of temperature T according to respective value in the corresponding tables.
Step 5: the pulse width t that searches actual measurement
wThe place section.
Step 6: according to actual pulse width t
wThe linear equation of place section is obtained actual pulse width t
wPairing temperature value.
Step 7: repeating step five, step 65 times calculate the temperature-averaging value of measuring for 5 times.
For example: the pulse width t of actual measurement
w=18200us
At first, the t that tables look-up
wBe positioned at [18630,17961 ,], corresponding temperature [16,17]
Therefore, measure temperature T=16+ (18200-17961)/(18630-17961)
＝16.357℃
Calculating the mean value of obtaining Current Temperatures for 5 times then is the temperature value of actual measurement.
Claims (4)
1. temperature measuring equipment, include: CPU main control chip (1), the temperature measurement circuit (2) that is electrically connected mutually with CPU main control chip (1), power supply and crystal oscillating circuit (3), additional function circuit (4), it is characterized in that: described temperature measurement circuit includes the NE555 timer, measuring resistance (R2), thermistor (R1), electric capacity (C4), wherein external power supply and measuring resistance (R2), thermistor (R1) series connection back is electrically connected mutually with the 6th pin of NE555 timer, external power supply and measuring resistance (R2), thermistor (R1), electric capacity (C4) series connection back ground connection, the 2nd pin of NE555 timer is that the trigger pip input end is electrically connected mutually with the trigger pip output pin of CPU main control chip, and the 3rd pin of NE555 timer is that pulse signal output end is electrically connected mutually with the pulse signal detection pin of CPU main control chip.
2. temperature measuring equipment according to claim 1, it is characterized in that: described CPU main control chip adopts the little process chip of single-chip microcomputer, voltage stabilizing chip employing model is the three-terminal voltage-stabilizing chip of 78L05 in described power supply and the crystal oscillating circuit, and the frequency of its crystal oscillator element is 12MHz.
3. temperature measuring equipment according to claim 1 is characterized in that: described additional function circuit (4) comprises light isolation module, relay output module, is electrically connected mutually with CPU main control chip (1) respectively.
4. the described temperature measuring equipment of utilization such as any claim of claim 1 to 3 is measured method of temperature, it is characterized in that: the numerical value of the pulse signal output end output of NE555 timer is output pulse width t, its voltage that is expressed as electric capacity (C4) is raised to three of the external power supply voltage/two o'clock required time from above freezing, comprises following steps with the method for above-mentioned temperature measurement device:
Step 1: the scope of this device measured temperature is expressed as T
1To T
n, with T
1To T
nBe divided into the n-1 section, [T
1, T
2), [T
2, T
3), [T
3, T
4) ... [T
(n-1), T
n);
Step 2: measure thermistor respectively at T
1, T
2, T
3... T
nDuring temperature, the output pulse width t of NE555
1, t
2, t
3... t
nBe total to n value.
Step 3: set up the corresponding tables of pulse width t and temperature T, and be stored in the CPU main control chip.
Step 4: think that pulse width t and temperature T are linear in that each section is approximate, according to (t
(n-1), T
(n-1)), (t
n, T
n) set up pulse width t and temperature T pairing linear equation in every section.
Step 5: the pulse width t that searches actual measurement
wThe place section.
Step 6: according to actual pulse width t
wThe linear equation of place section is obtained actual pulse width t
wPairing temperature value.
Step 7: repeating step five, step 65 times calculate the temperature-averaging value of measuring for 5 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100693518A CN101118190A (en) | 2007-06-15 | 2007-06-15 | Temperature measurement device and process for measuring temperature with device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100693518A CN101118190A (en) | 2007-06-15 | 2007-06-15 | Temperature measurement device and process for measuring temperature with device |
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| Publication Number | Publication Date |
|---|---|
| CN101118190A true CN101118190A (en) | 2008-02-06 |
Family
ID=39054395
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|---|---|---|---|
| CNA2007100693518A Pending CN101118190A (en) | 2007-06-15 | 2007-06-15 | Temperature measurement device and process for measuring temperature with device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101922981A (en) * | 2010-09-10 | 2010-12-22 | 中冶南方（武汉）自动化有限公司 | Thermistor temperature detecting method based on DSP (Digital Signal Processing) |
| CN102084230B (en) * | 2008-07-02 | 2013-06-12 | 泰尔茂株式会社 | Electronic thermometer and operation control method |
| CN104330187A (en) * | 2014-11-04 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Temperature detection system capable of realizing power saving mode |
| CN106017730A (en) * | 2016-06-17 | 2016-10-12 | 广州中大微电子有限公司 | Temperature sensor integrated in RFID tag |
| CN107340790A (en) * | 2017-09-08 | 2017-11-10 | 苏州晶品新材料股份有限公司 | A kind of photoelectricity engine and its temperature control method with temperature control system |
| CN108613753A (en) * | 2018-01-05 | 2018-10-02 | 京东方科技集团股份有限公司 | Thermometry and device, storage medium, the temperature measuring equipment method of inspection |
| CN110333003A (en) * | 2019-07-02 | 2019-10-15 | 三江学院 | NTC temperature linearity sample circuit |
| CN110375876A (en) * | 2019-07-25 | 2019-10-25 | 上海英恒电子有限公司 | A kind of IGBT temperature detection circuit and method |
| CN111679598A (en) * | 2020-05-18 | 2020-09-18 | 惠州拓邦电气技术有限公司 | Method and device for acquiring detection information of sensor |
| WO2020237486A1 (en) * | 2019-05-27 | 2020-12-03 | Oppo广东移动通信有限公司 | Temperature measurement method and apparatus, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102084230B (en) * | 2008-07-02 | 2013-06-12 | 泰尔茂株式会社 | Electronic thermometer and operation control method |
| CN101922981B (en) * | 2010-09-10 | 2012-01-04 | 中冶南方（武汉）自动化有限公司 | Thermistor temperature detecting method based on DSP (Digital Signal Processing) |
| CN101922981A (en) * | 2010-09-10 | 2010-12-22 | 中冶南方（武汉）自动化有限公司 | Thermistor temperature detecting method based on DSP (Digital Signal Processing) |
| CN104330187A (en) * | 2014-11-04 | 2015-02-04 | 青岛歌尔声学科技有限公司 | Temperature detection system capable of realizing power saving mode |
| CN104330187B (en) * | 2014-11-04 | 2017-12-19 | 青岛歌尔声学科技有限公司 | A kind of system for detecting temperature of achievable battery saving mode |
| CN106017730A (en) * | 2016-06-17 | 2016-10-12 | 广州中大微电子有限公司 | Temperature sensor integrated in RFID tag |
| CN107340790A (en) * | 2017-09-08 | 2017-11-10 | 苏州晶品新材料股份有限公司 | A kind of photoelectricity engine and its temperature control method with temperature control system |
| CN108613753A (en) * | 2018-01-05 | 2018-10-02 | 京东方科技集团股份有限公司 | Thermometry and device, storage medium, the temperature measuring equipment method of inspection |
| WO2020237486A1 (en) * | 2019-05-27 | 2020-12-03 | Oppo广东移动通信有限公司 | Temperature measurement method and apparatus, and storage medium |
| CN114072683B (en) * | 2019-05-27 | 2024-01-05 | Oppo广东移动通信有限公司 | Temperature measurement method and device and storage medium |
| CN114072683A (en) * | 2019-05-27 | 2022-02-18 | Oppo广东移动通信有限公司 | Temperature measuring method and device and storage medium |
| CN110333003A (en) * | 2019-07-02 | 2019-10-15 | 三江学院 | NTC temperature linearity sample circuit |
| CN110375876A (en) * | 2019-07-25 | 2019-10-25 | 上海英恒电子有限公司 | A kind of IGBT temperature detection circuit and method |
| CN111679598A (en) * | 2020-05-18 | 2020-09-18 | 惠州拓邦电气技术有限公司 | Method and device for acquiring detection information of sensor |
| CN111679598B (en) * | 2020-05-18 | 2023-12-29 | 惠州拓邦电气技术有限公司 | Method and device for acquiring detection information of sensor |
| CN113324670A (en) * | 2021-05-31 | 2021-08-31 | 于铭 | Extensible multipoint temperature measurement method |
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