CN207703359U - A kind of acquisition of multichannel thermistor temp and processing unit - Google Patents
A kind of acquisition of multichannel thermistor temp and processing unit Download PDFInfo
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- CN207703359U CN207703359U CN201820026279.4U CN201820026279U CN207703359U CN 207703359 U CN207703359 U CN 207703359U CN 201820026279 U CN201820026279 U CN 201820026279U CN 207703359 U CN207703359 U CN 207703359U
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- thermistor
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Abstract
The utility model discloses a kind of acquisition of multichannel thermistor temp and processing units, including：Multiple thermistor (temperature) sensors, the sensor removably access circuit by connecting terminal block；Voltage source, the voltage source give the sensor power supply of parallel resistance parallel connection by divider resistance；Excitation switch, the excitation switch connection is per sensor all the way, electric break-make of the control per sensor all the way；The input terminal of two differential amplifier circuits is separately connected the both ends of divider resistance and parallel resistance；ADC is sampled, the output signal of two amplifying circuits of ADC sampling processings, and is bi-directionally connected with MCU controllers；The MCU controllers, control excitation switch is sampled with ADC, and connects touch screen, memory, USB interface and WIFI module.The utility model can realize multi way temperature acquisition in real time and processing, improve detection efficiency, and small, portability, at low cost, precision is high.
Description
Technical field
The utility model is related to thermistor temp detection fields, and in particular to a kind of acquisition of multichannel thermistor temp with
Processing unit.
Background technology
There is negative tempperature coefficient thermistor (NTC) resistance value the characteristic that exponentially property reduces is increased with temperature, and height is often made
Sensitivity temperature sensor, stability is good, and response is fast, small, and the service life is high, and price is low, and nominal impedance is very high, lead resistance
It has little effect, general best temperature-measuring range is 0 DEG C~100 DEG C.The disadvantage is that self-heating issues and non-linear serious, solution self-heating
Measurement electric current is needed to be maintained at the μ A orders of magnitude, nonlinear problem needs hardware or software to be linearized.
Currently, being not much using the instrument of thermistor multi-route measuring temperature on domestic market, the Agilent of generally use foreign countries
Or the data collector of fluke, the quick measurement of multiple functions may be implemented, however, in actual use, finding
Agilent34970A data collecting instruments and its Data Logger softwares can only be by 44004,44007,44006 these three series
NTC thermistor is converted to temperature in real time, and the thermistor of other series can only obtain resistance value.Then, tester is testing
When, the thermistor phasing meter for needing oneself to be provided by ransacing producer, artificial treatment takes time and effort, is not easy in high volume operate
It is anxious especially with regard to the data processing of the technical parameters such as multichannel deviation, the uniformity, fluctuation degree, heating and cooling time with preservation
Need a kind of quick treatment device of automation.
The data collector does not make automatically and efficiently not only thermistor detection be converted into temperature, but also usually requires
It connects PC machine to use, volume is big, and portability is not high enough.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is to provide a kind of multichannel thermistor temp acquisition
With processing unit, it can realize real time temperature acquisition and processing, improve detection efficiency, and precision is high, small, portability.
To achieve the goals above, the utility model uses technical solution below：
A kind of acquisition of multichannel thermistor temp and processing unit, including：
Multiple two-wire system NTC thermistor sensors；
First lead of divider resistance, the multiple two-wire system NTC thermistor sensor meets the divider resistance, institute
The second lead for stating multiple two-wire system NTC thermistor sensors is grounded；
Parallel resistance, it is in parallel with the multiple two-wire system NTC thermistor sensor；
Voltage source, the voltage source give the two-wire system NTC temperature-sensitives of the parallel resistance parallel connection by the divider resistance
Electric resistance sensor is powered；
The input terminal of first differential amplifier circuit, first differential amplifier circuit connects the both ends of the divider resistance；
The input terminal of second differential amplifier circuit, second differential amplifier circuit connects the both ends of the parallel resistance；
Excitation switch, controls between multiple two-wire system NTC thermistor sensors and second differential amplifier circuit
Electric signal break-make；
Analog-digital converter (ADC samplings), the input terminal of the analog-digital converter are defeated with first differential amplifier circuit
Outlet is connected with the output end of the second differential amplifier circuit；
Micro-control unit, excitation switch and the analog-digital converter (ADC samplings) described in the micro-control unit controls；
Touch display screen is connect with the micro-control unit；
Memory is connect with the micro-control unit.
Below as the optimal technical scheme of the utility model：
Multiple two-wire system NTC thermistor sensors access circuit, specifically, n two-wire system NTC by connecting terminal block
Thermistor (temperature) sensor, n >=2, n ∈ N, the thermistor (temperature) sensor access circuit by connecting terminal block, make sensor
It replaces and connect flexibly and easily.
The connecting terminal block access circuit is spring pressure line type PCB connecting terminal blocks.
The divider resistance is high-precision fixed value resistance, is connected with one end per sensor all the way, the other end of sensor
Ground connection plays partial pressure and current limliting, the influence for avoiding thermistor self-heating from measuring temperature.
Parallel resistance, the parallel resistance are high-precision fixed value resistance, and with per sensor parallel all the way, composition linearizes net
Network makes linearized network with temperature at monodrome linear relationship instead of single thermistor, is conducive to point for improving ADC samplings
Resolution.
Voltage source, the voltage source give the sensor power supply of parallel resistance parallel connection, and the electricity by divider resistance
Potential source is DC power supply.
Excitation switch, excitation switch have a n way switch, n >=2, n ∈ N, and control is per sensor all the way and and second poor
Divide the electric signal break-make of amplifying circuit.
ADC is sampled, and the output end of ADC samplings two differential amplifier circuits of connection realizes that timing sampling turns with digital-to-analogue
The function of changing.
Micro-control unit, i.e. MCU controllers, the MCU controllers control excitation switch is sampled with ADC, and connects touch
Screen, memory, WIFI module and USB interface.
The micro-control unit is connected with WIFI module.
The micro-control unit is connected with USB interface.
The excitation switch of the MCU controllers control, synchronization are only connected a switch, sequentially turn on.
The digital quantities of MCU controllers processing ADC sampling outputs, including first differential amplifier circuit transmission come
The voltage U of divider resistance1iThe voltage U of the divider resistance come with second differential amplifier circuit transmission2i, obtain i-th of sensing
The resistance of device
The model STM32F429 of the MCU controllers can carry out data processing, the real-time electricity that ADC is sampled
Resistance value is converted to temperature by look-up table and linear interpolation；
The touch screen configures parameter by the requirement of user and starts detection, shown touching as human-computer interaction interface
Screen display configures parameter, temperature curve, real time temperature and technical parameter；
The memory is for storing experimental data, thermistor phasing meter, thermistor deviation；
The USB interface is for exporting test data；
The WIFI module exports test data for being wirelessly connected mobile terminal.
The thermistor (temperature) sensor is pearl long lead NTC thermistor sensor, epoxy encapsulation.
Compared with prior art, the utility model has the beneficial effects that：
One, high certainty of measurement.By two differential amplifier circuits, influence of the voltage dithering to thermistor is eliminated, simultaneously
It again can suppression common mode interference signal.
Two, circuit is simple, and reliability is high.It is primary that thermistor all the way is only connected by encouraging the control of switch, make multichannel
When thermosensitive resistance measurement, the same signal conditioning circuit can be used, circuit cost and circuit area is reduced, economizes on resources, carry
Consistency, the reliability of high circuit.
Three, small, portability.The use of touch screen avoids connection PC machine, reduces volume, and connecting terminal block makes biography
Sensor is readily disassembled, and WIFI module and USB interface improve portability derived from data, whole to use more hommization.
Four, multichannel thermistor temp acquisition and processing unit can carry out heating and cooling to multiple hole points simultaneously and move
State thermometric, the cooperation sampled with memory and ADC by MCU controls, carries out data processing in real time, calculate temperature uniformity,
Fluctuation degree, temperature rate, drift correction and calibration.
Five, the utility model can realize multi way temperature acquisition in real time and processing, improve detection efficiency, and small,
Portability, at low cost, precision is high.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model multichannel thermistor temp acquisition and processing unit.
Specific implementation mode
The utility model is further illustrated with reference to the accompanying drawings and examples.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clear, complete description.In order to instruct technical solutions of the utility model, some conventional aspects are simplified or have been omitted.This field
Technical staff should be appreciated that modification or replacement from these embodiments, will be in the scope of the utility model.This reality as a result,
Following optional embodiments are not limited to novel, and only claim and their equivalent limits.
As shown in Figure 1, be the structure diagram of the utility model embodiment multichannel thermistor temp acquisition and processing unit,
Multichannel thermistor temp is acquired with processing unit：
N two-wire system NTC thermistor sensor, n >=2, n ∈ N, the sensor are pearl long lead NTC temperature-sensitive electricity
Hinder sensor, epoxy encapsulation；
Connecting terminal block, the connecting terminal block are spring pressure line type PCB connecting terminal blocks, and the sensor passes through wiring
Terminal block neatly accesses circuit；
Divider resistance R1, the divider resistance R1For high-precision fixed value resistance, R1Value 10k Ω, with every sensor all the way
One end is connected, the other end ground connection of sensor, divider resistance R1Play partial pressure and current limliting, avoids thermistor self-heating to temperature
Spend the influence measured；
Parallel resistance R2, the parallel resistance R2For high-precision fixed value resistance, R2Value 10k Ω, simultaneously with every sensor all the way
Connection forms linearized network, instead of single thermistor, linearized network is made, at monodrome linear relationship, to be conducive to temperature
Improve the resolution ratio of ADC samplings；
Voltage source Vref, the voltage source is direct current power source voltage source, VrefValue 2.5V gives parallel connection by divider resistance
Resistance R2Sensor power supply in parallel；
Excitation switch, excitation switch have a n way switch, n >=2, n ∈ N, control per sensor all the way and electric signal and
The break-make of second differential amplifier circuit；
First differential amplifier circuit, the input terminal connection divider resistance R of first differential amplifier circuit1Both ends；
Second differential amplifier circuit, the input terminal connection parallel resistance R of second differential amplifier circuit2Both ends；
ADC is sampled, and the output end of ADC samplings two differential amplifier circuits of connection realizes that timing sampling turns with digital-to-analogue
The function of changing；
MCU controllers, the MCU controllers model STM32F429, control excitation switch are sampled with ADC, and connection touches
Screen, memory, WIFI module and USB interface；
The excitation switch of the MCU controllers control, synchronization are only connected a switch, sequentially turn on；
The digital quantities of MCU controllers processing ADC sampling outputs, including first differential amplifier circuit transmission come
Divider resistance R1Voltage U1iThe divider resistance R come with second differential amplifier circuit transmission2Voltage U2i, obtain i-th
The resistance of sensorReal time temperature is converted to by look-up table and linear interpolation,
Thermistor phasing meter is provided by manufacturer；
The touch screen configures parameter by the requirement of user and starts detection, give MCU controllers as human-computer interaction interface
Order is sent, MCU controllers receive the data post analysis that ADC samplings are sent as a result, showing configuration ginseng in touch display screen
Number, temperature curve, real time temperature and technical parameter；
The memory is for storing experimental data, thermistor phasing meter, thermistor deviation；
The USB interface is for exporting test data；
The WIFI module exports test data for being wirelessly connected mobile terminal.
It should be noted that involved in the present apparatus to correlation module be hardware system module or in the prior art
The function module that computer software programs or agreement are combined with hardware, the computer software programs involved by the function module
Or the technology of agreement being well known to those skilled in the art in itself, it is not the improvements of this system；The improvement of this system
For the interaction relationship between each module, as the whole construction of system is improved, to be solved with solving this system
Certainly the technical issues of.
The method that thermistor resistance value is converted to temperature using look-up table and linear interpolation is a kind of well known technical side
Method.
The technical solution of the utility model and advantageous effect is described in detail in above-described specific implementation mode,
It should be understood that the foregoing is merely the most preferred embodiment of the utility model, it is not intended to limit the utility model, it is all at this
Any modification, supplementary, and equivalent replacement etc. done in the spirit of utility model, should be included in the guarantor of the utility model
Within the scope of shield.
Claims (5)
1. a kind of multichannel thermistor temp acquisition and processing unit, which is characterized in that including：
Multiple two-wire system NTC thermistor sensors；
First lead of divider resistance, the multiple two-wire system NTC thermistor sensor connects the divider resistance, described more
Second lead of a two-wire system NTC thermistor sensor is grounded；
Parallel resistance, it is in parallel with the multiple two-wire system NTC thermistor sensor；
Voltage source, the voltage source give the two-wire system NTC thermistor of the parallel resistance parallel connection by the divider resistance
Sensor is powered；
The input terminal of first differential amplifier circuit, first differential amplifier circuit connects the both ends of the divider resistance；
The input terminal of second differential amplifier circuit, second differential amplifier circuit connects the both ends of the parallel resistance；
Excitation switch, controls the telecommunications between multiple two-wire system NTC thermistor sensors and second differential amplifier circuit
Number break-make；
Analog-digital converter, the output end and the second difference of the input terminal of the analog-digital converter and first differential amplifier circuit
The output end of amplifying circuit connects；
Micro-control unit, excitation switch and the analog-digital converter described in the micro-control unit controls；
Touch display screen is connect with the micro-control unit；
Memory is connect with the micro-control unit.
2. multichannel thermistor temp acquisition according to claim 1 and processing unit, which is characterized in that described is multiple
Two-wire system NTC thermistor sensor accesses circuit by connecting terminal block.
3. multichannel thermistor temp acquisition according to claim 1 and processing unit, which is characterized in that the voltage
Source is DC power supply.
4. multichannel thermistor temp acquisition according to claim 1 and processing unit, which is characterized in that the micro-control
Unit processed is connected with WIFI module.
5. multichannel thermistor temp acquisition according to claim 1 and processing unit, which is characterized in that the micro-control
Unit processed is connected with USB interface.
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| CN201820026279.4U CN207703359U (en) | 2018-01-08 | 2018-01-08 | A kind of acquisition of multichannel thermistor temp and processing unit |
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| CN201820026279.4U CN207703359U (en) | 2018-01-08 | 2018-01-08 | A kind of acquisition of multichannel thermistor temp and processing unit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100040A (en) * | 2018-09-21 | 2018-12-28 | 杭州科美特传感器有限公司 | The temperature sensor and power battery BMS device detection system of more thermistors |
| CN109238496A (en) * | 2018-10-10 | 2019-01-18 | 孝感轻芯网络科技有限公司 | A kind of comprehensive contact intelligent temp-measuring device |
| CN111122020A (en) * | 2019-12-31 | 2020-05-08 | 中国科学院微电子研究所 | Capacitive pressure detection device and sensor |
| CN112146776A (en) * | 2020-09-30 | 2020-12-29 | 中车大连电力牵引研发中心有限公司 | Energy-saving high accuracy temperature detects integrated circuit board |
| WO2022040928A1 (en) * | 2020-08-25 | 2022-03-03 | 深圳市汇顶科技股份有限公司 | Temperature measurement circuit, temperature measurement and light measurement circuit, temperature measurement method, and temperature measurement and light measurement method |
| CN114544049A (en) * | 2022-01-05 | 2022-05-27 | 新余学院 | Pressure detection device of flexible electronic skin sensor |
| CN116046198A (en) * | 2022-12-30 | 2023-05-02 | 江苏海莱新创医疗科技有限公司 | Electrode plate, electrode plate temperature detection method and tumor electric field treatment system |
| CN116271523A (en) * | 2022-12-30 | 2023-06-23 | 江苏海莱新创医疗科技有限公司 | Electrode sheet, electrode sheet identification method, tumor electric field treatment system and treatment equipment |
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- 2018-01-08 CN CN201820026279.4U patent/CN207703359U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100040A (en) * | 2018-09-21 | 2018-12-28 | 杭州科美特传感器有限公司 | The temperature sensor and power battery BMS device detection system of more thermistors |
| CN109238496A (en) * | 2018-10-10 | 2019-01-18 | 孝感轻芯网络科技有限公司 | A kind of comprehensive contact intelligent temp-measuring device |
| CN111122020A (en) * | 2019-12-31 | 2020-05-08 | 中国科学院微电子研究所 | Capacitive pressure detection device and sensor |
| WO2022040928A1 (en) * | 2020-08-25 | 2022-03-03 | 深圳市汇顶科技股份有限公司 | Temperature measurement circuit, temperature measurement and light measurement circuit, temperature measurement method, and temperature measurement and light measurement method |
| CN112146776A (en) * | 2020-09-30 | 2020-12-29 | 中车大连电力牵引研发中心有限公司 | Energy-saving high accuracy temperature detects integrated circuit board |
| CN114544049A (en) * | 2022-01-05 | 2022-05-27 | 新余学院 | Pressure detection device of flexible electronic skin sensor |
| CN116046198A (en) * | 2022-12-30 | 2023-05-02 | 江苏海莱新创医疗科技有限公司 | Electrode plate, electrode plate temperature detection method and tumor electric field treatment system |
| CN116271523A (en) * | 2022-12-30 | 2023-06-23 | 江苏海莱新创医疗科技有限公司 | Electrode sheet, electrode sheet identification method, tumor electric field treatment system and treatment equipment |
| CN116046198B (en) * | 2022-12-30 | 2024-01-02 | 江苏海莱新创医疗科技有限公司 | Electrode plate, electrode plate temperature detection method and tumor electric field treatment system |
| CN116271523B (en) * | 2022-12-30 | 2024-03-29 | 江苏海莱新创医疗科技有限公司 | Electrode sheet, electrode sheet identification method, tumor electric field treatment system and treatment equipment |
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