CN208109280U - A kind of anti-interference temperature sensor - Google Patents
A kind of anti-interference temperature sensor Download PDFInfo
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- CN208109280U CN208109280U CN201820640507.7U CN201820640507U CN208109280U CN 208109280 U CN208109280 U CN 208109280U CN 201820640507 U CN201820640507 U CN 201820640507U CN 208109280 U CN208109280 U CN 208109280U
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Abstract
The utility model discloses a kind of anti-interference temperature sensors, it is related to temperature sensor field, it includes sensor body, the sensor body includes control unit, and described control unit includes the thermo-electric generation circuit for sensor body power supply, controller and anti-interference unit connected to the controller with sensor body electric connection.Anti-interference unit includes difference digital analog converter, relay and buzzer connected to the controller, and the relay is connect with sensor body, anti-interference for detecting induced current control sensor realization；The utility model solves the problems, such as existing temperature sensor due to the interference of induced current bring and fever that generate under strong-electromagnetic field, has achieved the effect that utilize thermo-electric generation while improving interference free performance.
Description
Technical field
The utility model relates to temperature sensor field, especially a kind of anti-interference temperature sensor.
Background technique
Temperature sensor refers to that the sensor that can be experienced temperature and be converted into output signal, temperature sensor are temperature measurements
The core of instrument, it is various in style, contact and contactless two major classes can be divided by measurement method, according to sensor material
And electron component characteristic is divided into two class of thermal resistance and thermocouple.
Under strong-electromagnetic field, when with conventional temperature sensor thermometric, due to metal material production temperature probe and lead
Line generates induced current and causes the severe jamming measured temperature, and temperature indicating value is made to generate very big error or at all can not be into
The stable temperature measurement of row, the pressure drop that the induced current of generation generates on sensor input circuit are superimposed together with useful signal
It is sent into subsequent measuring circuit, is directly becoming interference signal；Another aspect induced current will generate ohm on probe and conducting wire
Heat increases its own temperature, and due to the kelvin effect of conductor, the current density increase of conductor surface layer increases this own temperature
It is even more serious, therefore study and be of great significance to for glitch-free temperature sensor under strong-electromagnetic field.
Utility model content
The purpose of this utility model is that：The utility model provides a kind of anti-interference temperature sensor, solves existing
The problem of temperature sensor is interfered and is generated heat due to the induced current bring generated under strong-electromagnetic field.
The technical solution adopted in the utility model is as follows：
A kind of anti-interference temperature sensor, including sensor body, the sensor body include control unit, the control
Unit processed include for sensor body power supply thermo-electric generation circuit, with sensor body be electrically connected controller and with control
The anti-interference unit of device connection processed.
Preferably, the anti-interference unit includes difference digital analog converter, relay and buzzer connected to the controller,
The relay is connect with sensor body, anti-interference for detecting induced current control sensor realization.
Preferably, the thermo-electric generation circuit includes thermo-electric generation chip, boosting unit and the pressure stabilizing being sequentially electrically connected
Unit.
Preferably, the boosting unit includes resistance R15, resistance R16, resistance R17, triode Q1, triode Q2, two poles
Pipe D1, diode D2, diode D3, inductance L1 and capacitor C15；An interface of thermo-electric generation chip P1 and the connection of two interface both ends
The both ends resistance R16, secondly interfacing ground, connecting triode Q1 base stage, triode Q1 and three poles after resistance R16 connection resistance R15
Pipe Q1 emitter ground connection, triode Q1 connect inductance L1 after connecting with triode Q2 collector, triode Q2 base stage connects three poles
Pipe Q1 base stage, inductance L1 connection diode D1 cathode, diode D1 anode connect adjustable voltage input terminal, and inductance L1 is also via two
Be grounded after pole pipe D2 connection capacitor C15, capacitor C15 anode is also connected with after diode D3 connect resistance R17 after to ground, diode D3
Cathode is additionally coupled to voltage regulation unit input terminal；Voltage regulation unit includes amplifier U2A, voltage-stabiliser tube D11, resistance R12, resistance R10 and electricity
Hinder R13；Via being grounded after resistance R12 connection voltage-stabiliser tube D11, the normal phase input end of amplifier U2A passes through the normal phase input end of amplifier U2A
By the output end of resistance R13 connection amplifier U2A, the positive power source terminal of amplifier U2A connects VCC, the positive power source terminal of amplifier U2A also via
Resistance R10 connection voltage-stabiliser tube D11 cathode, the negative power end ground connection of amplifier U2A, amplifier U2A inverting input terminal connect boosting unit
Output end, the output end of amplifier U2A are also connected with the VDD pin of sensor body, the GND pin ground connection of sensor body, DQ
Pin connects 46 pin of controller.
Preferably, the circuit connection of anti-interference unit is as follows：The 14-17 pin of controller is separately connected digital analog converter
6-9 pin, the output end of digital analog converter connect 42 pin of controller, and buzzer circuit input terminal connects 43 pin of controller,
Relay circuit input terminal connects 45 pin of controller.
Preferably, the sensor body surface is provided with shielded layer.
In conclusion by adopting the above-described technical solution, the utility model has the beneficial effects that：
1. the utility model realizes cooling by the temperature of setting thermo-electric generation circuit Absorbing Sensor working environment, if
Set whether the electric current that controller connection digital analog converter calibration judges that sensor generates is induced current, to control relay control
The work of sensor processed avoids strong-electromagnetic field lower sensor and interferes big disadvantage, solve existing temperature sensor due to
The problem of interference of induced current bring and fever for being generated under strong-electromagnetic field, utilization while having reached raising interference free performance
The effect of thermo-electric generation；
2. the thermo-electric generation circuit that the present invention is arranged is generated electricity using sensor internal-external temperature difference, kept away while reducing power supply pressure
Exempt from existing power supply bring power supply disturbance problem, voltage regulation unit is set conducive to noise wave removing is removed and further increases interference free performance；
3. digital analog converter of the invention is optimized while realizing accurate detection using accurate, low cost, small size series
Sensor bulk further increases the stability of sensor；
4. shielded layer is arranged in inventive sensor body surface, diamagnetic interference is further realized, it is dual anti-interference, improve temperature
Spend the interference free performance of sensor.
Detailed description of the invention
The utility model will illustrate by example and with reference to the appended drawing, wherein：
Fig. 1 is the circuit diagram of the utility model；
Fig. 2 is the system block diagram of the utility model.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
It elaborates below with reference to Fig. 1, Fig. 2 to the utility model.
A kind of anti-interference temperature sensor, including sensor body, the sensor body include control unit, and control is single
Member includes the thermo-electric generation circuit for sensor body power supply, controller and and controller with sensor body electric connection
The anti-interference unit of connection；Anti-interference unit includes difference digital analog converter, relay and buzzer connected to the controller, after
Electric appliance is connect with sensor body, anti-interference for detecting induced current control sensor realization.
Working principle：Using temperature sensor as the working time extends the sensor that the fundamental property that temperature increases generates
With extraneous thermo-electric generation in ontology, avoided while realizing environmental protection and energy conservation dry using the general various power supplys of power supply bring
It disturbs, thermo-electric generation circuit adds voltage regulation unit, effective filters out clutter using hysteresis comparator, realizes anti-interference；Pass through digital-to-analogue
The stable output electric current of converter sets judges whether compared with the current signal that temperature sensor detects in strong-electromagnetic field work
Make environment, controls whether relay control temperature sensor works on and mentioned with buzzer if in strong-electromagnetic field
Show, the interference problem being effectively prevented under strong-electromagnetic field.
Embodiment 1
Thermo-electric generation circuit includes thermo-electric generation chip, boosting unit and the voltage regulation unit being sequentially electrically connected.Boosting is single
Member includes resistance R15, resistance R16, resistance R17, triode Q1, triode Q2, diode D1, diode D2, diode D3, electricity
Feel L1 and capacitor C15；An interface of thermo-electric generation chip P1 and two interface both ends connect the both ends resistance R16, secondly interfacing ground,
Connecting triode Q1 base stage after resistance R16 connection resistance R15, triode Q1 and triode Q1 emitter ground connection, triode Q1 and
Inductance L1, triode Q2 base stage connecting triode Q1 base stage, inductance L1 connection diode are connected after the connection of triode Q2 collector
D1 cathode, diode D1 anode connect adjustable voltage input terminal, inductance L1 also via being grounded after diode D2 connection capacitor C15,
Capacitor C15 anode is also connected with after diode D3 connect resistance R17 after to ground, diode D3 cathode is additionally coupled to voltage regulation unit input
End；Voltage regulation unit includes amplifier U2A, voltage-stabiliser tube D11, resistance R12, resistance R10 and resistance R13；The normal phase input end of amplifier U2A
Via being grounded after resistance R12 connection voltage-stabiliser tube D11, the normal phase input end of amplifier U2A is via the defeated of resistance R13 connection amplifier U2A
Outlet, the positive power source terminal of amplifier U2A connect VCC, and the positive power source terminal of amplifier U2A is also via resistance R10 connection voltage-stabiliser tube D11 yin
Pole, the negative power end ground connection of amplifier U2A, amplifier U2A inverting input terminal connect boosting unit output end, the output end of amplifier U2A
It is also connected with the VDD pin of sensor body, the GND pin ground connection of sensor body, DQ pin connects 46 pin of controller.
Temperature sensor uses DS18B20, and controller uses STM32 series monolithic, and relay is using HR series, digital-to-analogue
Converter uses AD5420, and for thermo-electric generation chip using TEC series, amplifier is serial using LM, and inductance L1 is used in boosting unit
Big inductance, capacitor C15 use bulky capacitor；When controllable switch V, that is, Q1Q2 is in on-state, power supply U0, that is, thermo-electric generation unit TEC-
P1 charges to inductance L1, charging current I1 substantially constant, while the voltage on capacitor C1 powers to the load；Because C15 value is very big,
Substantially being able to maintain output voltage is constant, and when V is in off-state, power supply Verf and inductance L1 charges to capacitor C15 jointly, output
Voltage increases, and realizes boosting；Voltage regulation unit is realized using hysteresis comparator removal interference and is stablized output.
Embodiment 2
The single-chip microcontroller of other series can also be used in controller, such as STC89C51 series, temperature sensor are not limited to implement
The model and type of example 1.The AD5420 that digital analog converter uses, digital analog converter and relay add peripheral circuit, guarantee
Its precision and stability converted and controlled improves the interference free performance of sensor conducive to the control precision for improving sensor.Its
The connection of peripheral circuit is as follows：The DVCC pin of digital analog converter connects capacitor C19, the C18 being connected in parallel, capacitor C19 anode
Connection+5V, cathode connect AGND, and 1,4,5,11,12 pins are grounded, are grounded after being also connected with resistance R24,24,22 pins
It is connected in parallel capacitor C20,24,21 pins in parallel connect capacitor C21, and capacitor C21 is also connected with capacitor C22, the C23 being connected in parallel
After be grounded, capacitor C22, C23, C20 and C21 anode is all connected with+12V, and capacitor C23 anode is also connected with the diode of series connection
It is grounded, is grounded after diode D12 cathode connection diode D13 anode, digital analog converter IOUT pin connects two poles after D12, D4
Also via 42 pin of resistance R23 connection controller after pipe D12 anode, resistance R23 is grounded after being also connected with diode D5, digital-to-analogue conversion
16 and 25 pins of device are grounded, and are grounded after 13 pins connection resistance R2,14 connect capacitor C24 with 15 pins after be grounded.After
The peripheral circuit connection of appliance circuit is as follows：Diode D6 cathode is connected after 2 pin connection+5V of relay, 5 pins connect two poles
Triode Q11 collector, triode Q11 emitter ground connection are also connected with after pipe D6 anode, base stage connects control after connecting resistance R7
45 pin of device processed, resistance R7 is also via connection+3.3V after the resistance R25 of series connection and Light-emitting diode LED 1,1 He of relay
6 pins are all connected with 1 and 3 interfaces that the pin of+12V, 3 and 4 is separately connected row's needle, arrange 2 interfacing grounds of needle, row's needle 1,3 interfaces are also
It is connect with VDD, DQ pin of sensor.
Claims (6)
1. a kind of anti-interference temperature sensor, including sensor body, the sensor body includes control unit, and feature exists
In：Described control unit includes the thermo-electric generation circuit for sensor body power supply, the control with sensor body electric connection
Device and anti-interference unit connected to the controller.
2. a kind of anti-interference temperature sensor according to claim 1, it is characterised in that：The anti-interference unit includes point
Digital analog converter, relay and buzzer not connected to the controller, the relay is connect with sensor body, for detecting
It is anti-interference that induced current controls sensor realization.
3. a kind of anti-interference temperature sensor according to claim 1, it is characterised in that：The thermo-electric generation circuit includes
Thermo-electric generation chip, boosting unit and the voltage regulation unit being sequentially electrically connected.
4. a kind of anti-interference temperature sensor according to claim 3, it is characterised in that：The boosting unit includes resistance
R15, resistance R16, resistance R17, triode Q1, triode Q2, diode D1, diode D2, diode D3, inductance L1 and capacitor
C15；An interface of thermo-electric generation chip P1 and two interface both ends connect the both ends resistance R16, secondly interfacing ground, resistance R16 connects
Connecting triode Q1 base stage after connecting resistance R15, triode Q1 and triode Q1 emitter ground connection, triode Q1 and triode Q2 collection
Inductance L1, triode Q2 base stage connecting triode Q1 base stage, inductance L1 connection diode D1 cathode, two poles are connected after electrode connection
Pipe D1 anode connects adjustable voltage input terminal, and for inductance L1 also via being grounded after diode D2 connection capacitor C15, capacitor C15 is positive
It is also connected with after diode D3 after connecting resistance R17 to ground, diode D3 cathode is additionally coupled to voltage regulation unit input terminal；Voltage regulation unit
Including amplifier U2A, voltage-stabiliser tube D11, resistance R12, resistance R10 and resistance R13；The normal phase input end of amplifier U2A is via resistance R12
It is grounded after connection voltage-stabiliser tube D11, output end of the normal phase input end of amplifier U2A via resistance R13 connection amplifier U2A, amplifier U2A
Positive power source terminal connect VCC, also via resistance R10 connection voltage-stabiliser tube D11 cathode, amplifier U2A's bears the positive power source terminal of amplifier U2A
Power end ground connection, amplifier U2A inverting input terminal connect boosting unit output end, and the output end of amplifier U2A is also connected with sensor sheet
The VDD pin of body, the GND pin ground connection of sensor body, DQ pin connect 46 pin of controller.
5. a kind of anti-interference temperature sensor according to claim 2, it is characterised in that：The circuit connection of anti-interference unit
It is as follows：The 14-17 pin of controller is separately connected the 6-9 pin of digital analog converter, and the output end of digital analog converter connects control
42 pin of device, buzzer circuit input terminal connect 43 pin of controller, and relay circuit input terminal connects 45 pin of controller.
6. a kind of anti-interference temperature sensor according to claim 1, it is characterised in that：The sensor body surface is set
It is equipped with shielded layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820640507.7U CN208109280U (en) | 2018-04-28 | 2018-04-28 | A kind of anti-interference temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820640507.7U CN208109280U (en) | 2018-04-28 | 2018-04-28 | A kind of anti-interference temperature sensor |
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| Publication Number | Publication Date |
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| CN208109280U true CN208109280U (en) | 2018-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820640507.7U Expired - Fee Related CN208109280U (en) | 2018-04-28 | 2018-04-28 | A kind of anti-interference temperature sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285890A (en) * | 2019-06-29 | 2019-09-27 | 南京亚克电子有限公司 | A kind of temperature-sensing system under complex electromagnetic environment |
-
2018
- 2018-04-28 CN CN201820640507.7U patent/CN208109280U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285890A (en) * | 2019-06-29 | 2019-09-27 | 南京亚克电子有限公司 | A kind of temperature-sensing system under complex electromagnetic environment |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181116 Termination date: 20210428 |
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| CF01 | Termination of patent right due to non-payment of annual fee |