CN207585786U - A kind of hypersensitive temperature sensor - Google Patents
A kind of hypersensitive temperature sensor Download PDFInfo
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- CN207585786U CN207585786U CN201721822424.1U CN201721822424U CN207585786U CN 207585786 U CN207585786 U CN 207585786U CN 201721822424 U CN201721822424 U CN 201721822424U CN 207585786 U CN207585786 U CN 207585786U
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- 206010020751 Hypersensitivity Diseases 0.000 title claims abstract description 10
- 230000035945 sensitivity Effects 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010034464 Periarthritis Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000036413 temperature sense Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The utility model discloses a kind of hypersensitive temperature sensors based on slicing operation amplifier, and by a temperature-sensitive point circuit, a clipping amplifier circuit, a temperature-compensation circuit, a transducer sensitivity adjusts circuit, a warning circuit forms.The temperature-sensitive point circuit, needs us to make temperature-sensitive element by oneself, and the relative position of two temperature-sensitive points A, B can arbitrarily change.The clipping amplifier circuit, by operational amplifier N1And peripheral cell composition, actually constitute a voltage comparator.The temperature-compensation circuit, by zener diode V1(temperature compensation type bandgap voltage reference：1.23V) and its peripheral resistor network forms operational amplifier inverting input biasing circuit.The transducer sensitivity adjusts circuit, and the sensitivity of sensor circuit can be adjusted by potentiometer POT, comparator is made to have certain hysteresis by adjusting sensitivity.The warning circuit, by transistor V2And direct current piezoelectric buzzer HA compositions.
Description
Technical field
The utility model is related to a kind of technology of temperature control sensor, especially a kind of hypersensitive based on slicing operation amplifier
Temperature sensor, the sensor can both test thermoelectric voltage, and switching value can be also exported as common temperature-sensitive element, composition
Auto temperature controlled system, such as " draught detector ".
Background technology
In routine work and life, it is sometimes desirable to detect the temperature difference of water inlet pipe and outlet pipe in cooling circulating water；For
Mitigate the harm of draught, need to judge that door and window is to open or should close；People need to monitor combustion site（Such as
Gas flame）, prevent fray-out of flame.
General industry is by the way of, using the identical thermistor of two parameters and two in similary temperature strip
The metalfilmresistor as thermistor is measured under part, their bridge-types are connected, as long as regulating the compensation of lead, output
It is exactly the temperature difference；Or two kinds of environment directly are respectively placed in using two identical thermocouples, then a secondary meter is coupled and carries out
Operation can indicate the temperature difference.
Thermocouple is a kind of temperature sensor, and thermocouple output is millivolt signal, therefore the above method can be used as temperature
Indicator or calculating temperature difference, but output temperature or the temperature difference cannot function as switching stage application.If in thermoelectricity occasionally thermal resistance temperature
It spends in variation range, artificial looks for a correspondence to the voltage in circuit or curent change in 4 ~ 20mA electric currents, and sensor is just
It is transmitted in transmitter in the form of this corresponding current, the effect of transmitter is exactly that the current signal for transmitting sensor is handled
Host computer or display instrument or executing agency or warning device are transmitted in the form of digital signal afterwards.
But the program general user of transmitter can not modify, and be carried out by producer, therefore this is extremely inconvenient.
So if there is a kind of sensor that can directly test the temperature difference is fabulous, which can directly export switching value, into
The corresponding Industry Control of row, designs a kind of one kind that can be used in very wide temperature range using Limiting Amplifier Design below
Temperature responsive unit --- temperature control sensor, the output of this temperature control sensor can realize more than demand for control.
Invention content
The technical problem to be solved by the utility model is to provide it is a kind of it is simple in structure, cheap, using it is reliable, can be from
The equipment of the dynamic temperature difference for measuring local environment different location, i.e. temperature sensor, sensor can both test thermoelectric
Pressure can also export switching value as common temperature-sensitive element, form auto temperature controlled system, such as " draught detector ".
To achieve the above object, the utility model provides a kind of hypersensitive temperature difference sensing based on slicing operation amplifier
Device, by a temperature-sensitive point circuit, a clipping amplifier circuit, a temperature-compensation circuit, a transducer sensitivity tune
Economize on electricity road, a warning circuit composition；The temperature-sensitive point circuit uses us self-designed thermocouple to be filled as temperature sense
It puts, temperature-sensitive point circuit is by the normal phase input end of resistance R2 connection amplifiers N1, while temperature-sensitive point circuit passes through resistance R3 connections and transports
The inverting input of N1 is put, the faint temperature signal that temperature-sensitive point circuit is sensed is amplified by the clipping amplifier circuit；
The temperature-compensation circuit, the inverting input of connection operational amplifier circuit N1, the inverting input for forming slicing operation amplifier are inclined
Circuits；The transducer sensitivity adjusts circuit, and the similary inverting input for connecting operational amplifier circuit N1 amplifies slicing operation
Device output has certain hysteresis；Slicing operation amplifier output signal passes through resistance R9 connection transistors V2Base stage,
As transistor V2Base bias voltage, transistor V2C-E poles conducting ,+4.5V power supplys be sequentially connected direct current buzzer HA,
Resistance R10, transistor V2 are formed into a loop with ground, drive direct current buzzer warning.
The temperature-sensitive point circuit, needs us to make temperature-sensitive element by oneself, and this temperature-sensitive element is made of copper wire and resistive conductor,
And the relative position of shape, size or two temperature-sensitive points A, B can arbitrarily change, and adapt to extremely severe ring
Border.
The clipping amplifier circuit, by operational amplifier N1And peripheral cell composition, actually constitute an electricity
Press comparator.
The temperature-compensation circuit, the temperature-compensation circuit are sequentially connected resistance R7, voltage stabilizing by+4.5V power supplys
Diode V1And ground is formed into a loop, and forms a burning voltage+1.23V at V1 both ends, which passes through resistance R5, electricity
The inverting input of position device POT, resistance R4 connection amplifiers N1, form operational amplifier inverting input biasing circuit.
The transducer sensitivity adjusts circuit, and+1.23V burning voltages are connected by resistance R5, potentiometer POT, resistance R4
The inverting input of amplifier N1 is connect, the sensitivity of sensor circuit can be adjusted by changing potentiometer POT resistance values, sensitive by adjusting
Degree makes comparator have certain hysteresis.
The warning circuit, by transistor V2And direct current piezoelectric buzzer HA compositions.
Description of the drawings
Attached drawing 1, attached drawing 2, attached drawing 3 are used to provide a further understanding of the present invention, and form the part of the application,
Attached drawing 1 is the utility model designed temperature difference sensor electrical schematic diagram.Attached drawing 2 is the structure for making temperature-sensitive element by oneself.Attached drawing 3 is4.5V converter.
Specific embodiment
Attached drawing 1 is the utility model designed temperature difference sensor electrical schematic diagram, is put by a temperature-sensitive point circuit, an amplitude limit
Big device circuit, a temperature-compensation circuit, a transducer sensitivity adjust circuit, a warning circuit composition, in detail below
Introduce the utility model.
Slicing operation amplifier passes through laser-adjusting, better than common amplifier, allow to amplify minimum input voltage without by
Biasing effect.Thermocouple is for measuring temperature（Essence is also to measure the temperature difference, but is arrived cold-point temperature compensation by compensation circuit
0℃）, due to the limitation of its volume, shape, material, it is impossible to which flexible adaptation can not possibly be used alone in various complex environments
It measures " the real temperature difference ", us is needed to make temperature-sensitive element by oneself.
Temperature-sensitive point makes：For the minimum temperature difference, a kind of temperature-sensitive element can be designed, this temperature-sensitive element is by copper wire and electricity
Line is hindered to form, and the relative position of shape, size or two temperature-sensitive points A, B can also arbitrarily change, and adapt to extremely
Rugged environment, the harmful effect of environment can be inhibited by suitable circuit, as shown in Figure 2.This temperature-sensitive element its
Real is also a kind of thermocouple, it is to be specifically used to measure the temperature difference rather than measure the temperature-sensitive element of temperature, therefore does not need to specially refer to
Bright cool and heat ends.
The characteristic of operational amplifier：ICL7650, in open loop operation mode, is not provided with negative anti-as operational amplifier
Feedback, therefore sensitivity is very high.The current potential of this voltage comparator circuit output terminal and the electric potential relation of input terminal are：In-phase input end
During more than anti-phase input terminal voltage, output voltage is close to positive voltage；When in-phase input end is less than anti-phase input terminal voltage,
Output voltage is close to negative supply voltage.This necessary input voltage difference of operational amplifier is in millivolt rank, zero load amplification
Rate is higher, this voltage difference is smaller.
It means that although with the voltage difference very little mutually between inverting input, it can also be amplified many times.Therefore appoint
What voltage difference can all make level of the amplifier output for the positive and negative anodes of power supply, depend entirely on input voltage and be above or below base
Quasi- voltage.This comparing function is exactly that we are required.
Transducer sensitivity adjusts：In electrical principle Fig. 1, slicing operation amplifier N1Actually constitute a voltage
Comparator, by the adjunct circuit of comparator inverting input, thus it is possible to vary in-phase input end causes the input that comparator inverts
The threshold voltage of signal, the threshold values is in zero crossings sensitivity highest.
By zener diode V1(temperature compensation type bandgap voltage reference：1.23V) and its peripheral resistor network composition is transported
Amplifier inverting input biasing circuit is calculated, the DC component of the signal of inverting input can be adjusted, final change operation is put
The threshold voltage of big device output signal overturning.
The sensitivity of sensor circuit can be adjusted by potentiometer POT in figure, sensitivity not adjust too high, Yi Mian electricity
Occur vibrating in road or the input voltage of very little is poor（Such case is constantly present in practice）Just make comparator N1Overturning, passes through tune
Section sensitivity makes comparator have certain hysteresis.
By the 9th feet of ICL7650（Clamped end）Operational amplifier inverting input is connected on, is defeated in order to improve operational amplifier
Go out signal DC component.That is operational amplifier output depends not only on external input with inputting actual electric potential relation
Voltage, and dependent on inputting relevant bias voltage, ICL7650 typical input bias current only 2pA, such input terminal
The resistance value of outer connecting resistance can be very big, such as the disturbance voltage of 1 μ V corresponds to：
R==500KΩ
The design chooses the outer connecting resistance R of inverting input3Resistance value is 1.2M Ω.
Sensor application：Thermo detector circuit shown in Fig. 1 primes can provide 1k（Fahrenheit temperature）The temperature difference, so by
For test sample since the influence that the temperature difference generates can be remained with unit voltage of different sizes, this circuit can be suitable
It is used in small temperature range.
For " thermocouple " that this temperature sensor is designed using us as temperature sensing device, the two are communicating together
Temperature-sensitive point is made of identical material, or they are as two relevant different monitoring points, provide thermoelectric voltage；Or as normal
The temperature-sensitive element seen is used as " auto temperature controlled system " sensor like that.It is used for example as " draught detector ", exactly house yin, yang
Both sides have the temperature difference just to cause draught, and the temperature difference is bigger, wind speed is bigger, thus can by the detection of the temperature difference so as to automatically turning on or
It closes the doors and windows, in order to avoid human body is caused to be damaged by draught.
This practical circuit is suitable for a variety of monitoring tasks, if event occurs to send out alarm by piezoelectric buzzer HA,
Amplifier is through a transistor driving buzzer.Transistor V2Base stage there is no bias voltage, therefore be likely to occur such a phenomenon：
The output current potential not determined during Amplifier ON, thus input signal is not reacted.As long as in V2Base stage and collector it
Between plus a negative-feedback capacitance C3, this shortcoming can be overcome.
Test this detector（Temperature sensor）When, a small-pulse effect is first sent, such as touch temperature-sensitive point connector
Place, a check pulse is just generated, buzzer can sound.Due to buzzer direct current supply, therefore use direct current buzzer.
When detector does not have input signal, the interference signal of external electrical network frequency can enter circuit, send out buzzer
Go out cackle, detector has this cackle can be covered during signal voltage.So alternating voltage coupling in environment in order to prevent
Into detector, compensation circuit must be accessed between output terminal and inverting input, due to the high resistant characteristic of operational amplifier,
Most of application scenarios use the feedback capacity C of a 2.7pF7It is enough as compensation circuit.
A S can be added again on circuit1Switch, so that the capacitance of bigger can be accessed when needed.But which increase
Response time and turn-off time.For example, still by taking draught detector as an example, it is harmful to postpone the turn-off time, such as causes interior
The illnesss such as people's anemopyretic cold, scapulohumeral periarthritis.
Function Extension：Temperature sensor after Function Extension can indicate the temperature difference using digital voltmeter；Its output stage
Switching stage is can also act as, such as switch ventilation or heating system.Temperature-sensitive element inertia very little is conducive to quick response, by this biography
Sensor can also monitor bulk goods, prevent their spontaneous combustions；Another significant application is to be carried out by optical element remote
Detector is arranged in focus by temperature detection.
Power supply：This design uses4.5V powers, and can be provided by power frequency 220V through over commutation, voltage stabilizing；For the ease of
The AC influence of network voltage is carried and reduced, 9V laminated cells can be used, by voltage changer ICL7660, by 9v
Cell voltage is converted to symmetrically4.5V, as shown in Figure 3.
The temperature sensor works in limiter comparator working condition using operational amplifier ICL7650, by us certainly
The temperature-sensitive element of system（Itself it is also thermocouple）, a temperature control sensor is formed, which can be used as temperature indicator；
Can be as the sensor of the output switches digital of general significance, exporting switching value using it can be with the unlatching of control device
Or close, complete Industry Control.The circuit design is novel, simple for structure, and cost of manufacture is very cheap, is conducive to marketing.
Claims (5)
1. a kind of hypersensitive temperature sensor, it is characterised in that：By a temperature-sensitive point circuit, clipping amplifier circuit, one
A temperature-compensation circuit, a transducer sensitivity adjust circuit, a warning circuit composition；The temperature-sensitive point circuit uses me
Self-designed thermocouple as temperature sensing device, the positive that temperature-sensitive point circuit passes through resistance R2 connection amplifiers N1 inputs
End, while the faint temperature difference that temperature-sensitive point circuit is sensed by the inverting input of resistance R3 connection amplifiers N1, temperature-sensitive point circuit
Signal is amplified by the clipping amplifier circuit；The temperature-compensation circuit, the inverting input of connection operational amplifier circuit N1,
Form the inverting input biasing circuit of slicing operation amplifier；The transducer sensitivity adjusts circuit, equally connects amplifier
The inverting input of circuit N1 makes the output of slicing operation amplifier have certain hysteresis；Slicing operation amplifier exports
Signal passes through resistance R9 connection transistors V2Base stage, as transistor V2Base bias voltage, transistor V2C-E poles lead
Logical ,+4.5V power supplys are sequentially connected direct current buzzer HA, resistance R10, transistor V2 and ground and are formed into a loop, and drive direct current buzzer
Alarm.
2. hypersensitive temperature sensor according to claim 1, it is characterised in that：The temperature-sensitive point circuit needs certainly
Temperature-sensitive element processed, this temperature-sensitive element are made of copper wire and resistive conductor, and shape, size or two temperature-sensitive points A, B
Relative position can arbitrarily change, and adapt to extremely rugged environment.
3. hypersensitive temperature sensor according to claim 1, it is characterised in that：The clipping amplifier circuit, by
Operational amplifier N1And peripheral cell composition, actually constitute a voltage comparator.
4. hypersensitive temperature sensor according to claim 1, it is characterised in that：The temperature-compensation circuit, by+
4.5V power supplys are sequentially connected resistance R7, zener diode V1, with ground be formed into a loop, V1 both ends formed a burning voltage+
1.23V, the burning voltage by resistance R5, potentiometer POT, resistance R4 connection amplifiers N1 inverting input, composition operation put
Big device inverting input biasing circuit.
5. hypersensitive temperature sensor according to claim 1, it is characterised in that：The transducer sensitivity adjusts electricity
Road ,+1.23V burning voltages by resistance R5, potentiometer POT, resistance R4 connection amplifiers N1 inverting input, change potentiometer
POT resistance values can adjust the sensitivity of sensor circuit, comparator be made to have certain hysteresis by adjusting sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721822424.1U CN207585786U (en) | 2017-12-24 | 2017-12-24 | A kind of hypersensitive temperature sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721822424.1U CN207585786U (en) | 2017-12-24 | 2017-12-24 | A kind of hypersensitive temperature sensor |
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| Publication Number | Publication Date |
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| CN207585786U true CN207585786U (en) | 2018-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830945A (en) * | 2017-12-24 | 2018-03-23 | 山西工程技术学院 | A kind of hypersensitive temperature sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830945A (en) * | 2017-12-24 | 2018-03-23 | 山西工程技术学院 | A kind of hypersensitive temperature sensor |
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Granted publication date: 20180706 |