CN208998957U - A kind of measurement slight temperature varying circuit - Google Patents
A kind of measurement slight temperature varying circuit Download PDFInfo
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- CN208998957U CN208998957U CN201821889105.7U CN201821889105U CN208998957U CN 208998957 U CN208998957 U CN 208998957U CN 201821889105 U CN201821889105 U CN 201821889105U CN 208998957 U CN208998957 U CN 208998957U
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Abstract
The utility model discloses a kind of measurement slight temperature varying circuits, temperature signal output end including temperature collecting module is connected with the first signal input part of temperature output module, first signal output end of temperature controller is connected with the signal input part of temperature reference module, the signal output end of temperature reference module is connected with the second signal input terminal of temperature output module, the output adjustable side of temperature controller is connected with the input adjustable side of temperature output module, and the temperature signal output end of temperature output module is connected with the temperature signal input of temperature controller.The utility model can quickly, dynamic, high-precision obtain Current Temperatures.
Description
Technical field
The utility model relates to a kind of technical field of temperature measurement, change electricity more particularly to a kind of measurement slight temperature
Road.
Background technique
Titration is analysis method most classical, ancient, that use scope is most wide, the side that the overwhelming majority is all indicated using current potential
Method, i.e. potentiometric titration are measured, and still, some, which react no corresponding indicator electrode or sample, has interference to electrode,
It is not available even, potentiometric titration is not just available at this time, and calorimetric titration just has ample scope for abilities.
It is known that potential change is the part form of expression chemically reacted in electrochemistry, and reaction enthalpy change can body
It now chemically reacts, all chemical reactions have the variation (Δ H) of enthalpy, have the property that
Δ H=Δ G+T* Δ S,
Wherein, Δ G is Gibbs free amount, and T is temperature, and Δ S is the variable quantity of entropy.
As long as there is chemical reaction, sample solution will generate the variation (rise or decline) of temperature, i.e., exothermic reaction or
Person's endothermic reaction.Corresponding one simple chemical reaction, the rising of temperature or decline number have with the amount of reaction product
Direct relationship.When titrant constant speed is added in titrand, titrant and titrated agent will generate chemical reaction, and temperature will
It changes, when titrated agent is not reacted completely, rate of temperature change will be constant；After titrimetric substance total overall reaction, temperature
Change rate will change, and the inflection point occurred on corresponding curve can be considered titration end-point.
And the calorimetric titration most important point is how quick, dynamic, the high-precision variation for obtaining Current Temperatures, leads to
Often in order to improve measurement accuracy, constant speed is needed to add, and adding speed is relatively low, it is minimum to be likely to be breached 0.02mL per second (every time
Additive amount 0.005mL), in this way, the temperature change for chemically reacting generation will be very little due to the amount very little of actual interpolation,
It is essentially all to change on 0.001 DEG C of the order of magnitude, in order to obtain the temperature change of this magnitude in time, needs a kind of completely new
Temperature measurement.
Utility model content
The utility model aims to solve at least the technical problems existing in the prior art, especially innovatively proposes a kind of survey
Measure slight temperature varying circuit.
In order to realize the above-mentioned purpose of the utility model, the utility model discloses a kind of measurement slight temperature variation electricity
Road, including temperature collecting module, temperature reference module, temperature output module and temperature controller,
The temperature signal output end of temperature collecting module is connected with the first signal input part of temperature output module, temperature control
First signal output end of device processed is connected with the signal input part of temperature reference module, the signal output end of temperature reference module with
The second signal input terminal of temperature output module is connected, the input tune of the output adjustable side and temperature output module of temperature controller
End is saved to be connected,
The temperature signal output end of temperature output module is connected with the temperature signal input of temperature controller.
The utility model is consistent with the temperature that temperature reference module is adjusted by the temperature that temperature collecting module acquires, finally
Fast and accurately measure real-time slight temperature variation.
In a kind of preferred embodiment of the utility model, temperature collecting module includes thermistor Rt, thermistor
The first end of Rt is connected with power ground, the second end of thermistor Rt respectively with the first end of resistance R1 and temperature output module
First signal input part is connected, and the second end of resistance R1 is connected with the first reference voltage.Thermistor Rt is affected by temperature its resistance
Value changes, and the voltage value exported accordingly also changes.Its temperature collecting module is equivalent to temperature sensor.
It further include follower U4, the input terminal and heat of follower U4 in a kind of preferred embodiment of the utility model
The second end of quick resistance Rt is connected, and the output end of follower U4 is connected with the first signal input part of temperature output module.It follows
Device is conducive to enhance input impedance, reduces output impedance, reduces error.
In a kind of preferred embodiment of the utility model, temperature reference module includes voltage cell U2, voltage cell
The signal input part of U2 is connected with the first signal output end of temperature controller, and the voltage output end and temperature of voltage cell U2 is defeated
The second signal input terminal of module is connected out.Controller acquires its output with temperature collecting module to voltage cell output signal
The close voltage value of voltage value.
It further include adder U5 and M voltage cell U3, the M in a kind of preferred embodiment of the utility model
For positive integer,
The reference voltage of i+1 voltage cell U3 is lower than the reference voltage of the i-th voltage cell U3, and the base of voltage cell U2
Quasi- voltage is greater than the reference voltage of jth voltage cell U3, and the i is the positive integer less than M, and the j is just whole no more than M
Number；
Or/and the voltage resolution of i+1 voltage cell U3 is higher than the voltage resolution of the i-th voltage cell U3, and voltage
The voltage resolution of unit U2 is lower than the voltage resolution of jth voltage cell U3；
The signal input part of jth voltage cell U3 is connected with+1 signal output end of jth of temperature controller, jth voltage list
The signal output end of first U3 is connected with+1 signal input part of jth of adder,
The signal input part of voltage cell U2 is connected with the first signal output end of temperature controller, voltage cell U2's
Signal output end is connected with the first signal input part of adder,
The voltage output end of adder is connected with the second signal input terminal of temperature output module.Adder is driven to export
Voltage value is equal with the voltage value approach that temperature collecting module acquires.
In a kind of preferred embodiment of the utility model, as M=1,
The reference voltage of voltage cell U2 is greater than the reference voltage of the 1st voltage cell U3,
Or/and the voltage resolution of voltage cell U2 is lower than the voltage resolution of the 1st voltage cell U3；
The signal input part of 1st voltage cell U3 is connected with the 2nd signal output end of temperature controller, the 1st voltage cell
The signal output end of U3 is connected with the 2nd signal input part of adder,
The signal input part of voltage cell U2 is connected with the first signal output end of temperature controller, voltage cell U2's
Signal output end is connected with the first signal input part of adder,
The voltage output end of adder is connected with the second signal input terminal of temperature output module.Voltage cell U2 with
2.5V is voltage reference, is used as coarse tuning voltage；1st voltage cell U3 is used as fine tuning voltage, output knot using 50mV as benchmark voltage
Fruit more levels off to zero.
In a kind of preferred embodiment of the utility model, temperature output module includes difference amplifier U6 and electronic cutting
Close U7, the normal phase input end of difference amplifier U6 respectively with the temperature signal output end of temperature collecting module and electronic switch U7
First input end X0 is connected,
The inverting input terminal of difference amplifier U6 respectively with the signal output end of temperature reference module and electronic switch U7
Second input terminal X1 is connected, and the output end of difference amplifier U6 is connected with the third input terminal X2 of electronic switch U7, electronic switch
The output end X of U7 is connected with the temperature signal input of temperature controller；The input adjustable side of electronic switch U7 and temperature control
The output adjustable side of device is connected.Make initial value level off to zero by difference amplifier, reduce error, enhances accuracy.
In a kind of preferred embodiment of the utility model, temperature controller includes controller U1 and A/D conversion module
The temperature signal input of U8, A/D conversion module U8 are connected with the temperature signal output end of temperature output module, A/D modulus of conversion
The temperature signal output end of block U8 is connected with the temperature signal input of controller U1.The analog signal of acquisition is converted into number
In signal input controller.
In a kind of preferred embodiment of the utility model, the resistance value of thermistor Rt is 100K's or/and resistance R1
Resistance value is 100K or/and the first reference voltage is 2.5V.
In a kind of preferred embodiment of the utility model, difference amplifier amplifies 100 times；100 times of amplification is examined
It surveys, to substantially increase measurement accuracy.
Or/and the reference voltage of voltage cell U2 is 2.5V or/and the reference voltage of the 1st voltage cell U3 is 50mV.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are: the utility model can
Quickly, dynamic, high-precision obtain Current Temperatures.
Detailed description of the invention
Fig. 1 is the utility model circuit connection diagram.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model
Limitation.
The utility model discloses a kind of measurement slight temperature varying circuits, including temperature collecting module, temperature reference mould
Block, temperature output module and temperature controller,
The temperature signal output end of temperature collecting module is connected with the first signal input part of temperature output module, temperature control
First signal output end of device processed is connected with the signal input part of temperature reference module, the signal output end of temperature reference module with
The second signal input terminal of temperature output module is connected, the input tune of the output adjustable side and temperature output module of temperature controller
End is saved to be connected,
The temperature signal output end of temperature output module is connected with the temperature signal input of temperature controller.
In a kind of preferred embodiment of the utility model, temperature collecting module includes thermistor Rt, thermistor
The first end of Rt is connected with power ground, the second end of thermistor Rt respectively with the first end of resistance R1 and temperature output module
First signal input part is connected, and the second end of resistance R1 is connected with the first reference voltage.In the present embodiment, thermistor Rt
Resistance value be 100K, the resistance value of resistance R1 is 100K, advantageously reduces the fuel factor of electric current generation, reducing influences accuracy of instrument.
First reference voltage is 2.5V.
It further include follower U4, the input terminal and heat of follower U4 in a kind of preferred embodiment of the utility model
The second end of quick resistance Rt is connected, and the output end of follower U4 is connected with the first signal input part of temperature output module.At this
In embodiment, follower can form for amplifier LM324, the inverting input terminal and amplifier LM324 of amplifier LM324
Output end be connected, i.e., composition follower.
In a kind of preferred embodiment of the utility model, temperature reference module includes voltage cell U2, voltage cell
The signal input part of U2 is connected with the first signal output end of temperature controller, and the voltage output end and temperature of voltage cell U2 is defeated
The second signal input terminal of module is connected out.In the present embodiment, voltage cell U2 be D/A converter, by controller to
D/A converter issues signal, and the outside output voltage values of D/A converter, precision can be 24 AD7710 sampling A/D chips.
It further include adder U5 and M voltage cell U3, the M in a kind of preferred embodiment of the utility model
For positive integer,
The reference voltage of i+1 voltage cell U3 is lower than the reference voltage of the i-th voltage cell U3, and the base of voltage cell U2
Quasi- voltage is greater than the reference voltage of jth voltage cell U3, and the i is the positive integer less than M, and the j is just whole no more than M
Number；
Or/and the voltage resolution of i+1 voltage cell U3 is higher than the voltage resolution of the i-th voltage cell U3, and voltage
The voltage resolution of unit U2 is lower than the voltage resolution of jth voltage cell U3；
The signal input part of jth voltage cell U3 is connected with+1 signal output end of jth of temperature controller, jth voltage list
The signal output end of first U3 is connected with+1 signal input part of jth of adder,
The signal input part of voltage cell U2 is connected with the first signal output end of temperature controller, voltage cell U2's
Signal output end is connected with the first signal input part of adder,
The voltage output end of adder is connected with the second signal input terminal of temperature output module.In the present embodiment,
1st voltage cell U3 is D/A converter, issues signal, the outside output voltage of D/A converter to D/A converter by controller
Value, precision can be 24 D/A converters.The voltage that adder U5 exports voltage cell U2 and the 1st voltage cell U3
Value is superposed to and voltage output.
In a kind of preferred embodiment of the utility model, as M=1,
The reference voltage of voltage cell U2 is greater than the reference voltage of the 1st voltage cell U3, wherein the benchmark of voltage cell U2
Voltage is 2.5V, and the reference voltage of the 1st voltage cell U3 is 50mV.
Or/and the voltage resolution of voltage cell U2 is lower than the voltage resolution of the 1st voltage cell U3；Voltage cell U2's
Voltage resolution uses 24 D/A converters, and the voltage resolution of the 1st voltage cell U3 uses 32 D/A converters.
The signal input part of 1st voltage cell U3 is connected with the 2nd signal output end of temperature controller, the 1st voltage cell
The signal output end of U3 is connected with the 2nd signal input part of adder,
The signal input part of voltage cell U2 is connected with the first signal output end of temperature controller, voltage cell U2's
Signal output end is connected with the first signal input part of adder,
The voltage output end of adder is connected with the second signal input terminal of temperature output module.
In a kind of preferred embodiment of the utility model, temperature output module includes difference amplifier U6 and electronic cutting
Close U7, the normal phase input end of difference amplifier U6 respectively with the temperature signal output end of temperature collecting module and electronic switch U7
First input end X0 is connected,
The inverting input terminal of difference amplifier U6 respectively with the signal output end of temperature reference module and electronic switch U7
Second input terminal X1 is connected, and the output end of difference amplifier U6 is connected with the third input terminal X2 of electronic switch U7, electronic switch
The output end X of U7 is connected with the temperature signal input of temperature controller；The input adjustable side of electronic switch U7 and temperature control
The output adjustable side of device is connected.Difference amplifier can form for amplifier LM358 and resistance R1 and resistance R2, amplifier
The inverting input terminal of LM358 is connected with the first end of the first end of resistance R1 and resistance R2 respectively, the second end of resistance R1 with put
Big device LM358 output end is connected, that is, may make up simple difference amplifier.Difference amplifier amplifies 100 in the present embodiment
Times；Wherein, electronic switch is when being connected all the way, and another two-way disconnects；Can also three tunnels simultaneously switch off, electronic switch can be with hilted broadsword
Three hold switch.
In a kind of preferred embodiment of the utility model, temperature controller includes controller U1 and A/D conversion module
The temperature signal input of U8, A/D conversion module U8 are connected with the temperature signal output end of temperature output module, A/D modulus of conversion
The temperature signal output end of block U8 is connected with the temperature signal input of controller U1.In the present embodiment, A/D conversion module
U8 is 24 7710 sampling A/D chips of high-precision AD.
As shown in Figure 1, the physical circuit for the utility model connects: the first end of thermistor Rt is connected with power ground,
The second end of thermistor Rt is connected with the input terminal of the first end of resistance R1 and follower U4 respectively, the second end of resistance R1 with
First reference voltage is connected, the output end of follower U4 respectively with the normal phase input end of difference amplifier U6 and electronic switch U7
First input end X0 be connected, the inverting input terminal of difference amplifier U6 respectively with the voltage output end of adder and electronic switch
The second input terminal X2 of U7 is connected, and the output end of difference amplifier U6 is connected with the third input terminal X1 of electronic switch U7, electronics
The output end X of switch U7 is connected with the temperature signal input of A/D conversion module U8, and the temperature signal of A/D conversion module U8 is defeated
Outlet is connected with the temperature signal input of controller U1；The signal input part of 1st voltage cell U3 and the 2nd letter of controller U1
Number output end is connected, and the signal output end of the 1st voltage cell U3 is connected with the 2nd signal input part of adder, voltage cell U2
Signal input part be connected with the first signal output end of controller U1, the of the signal output end of voltage cell U2 and adder
One signal input part is connected, and the output adjustable side of controller U1 is connected with the input adjustable side of electronic switch U7, realizes electronic cutting
The switching of pass.
While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that:
These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principles of the present invention and objective
And modification, the scope of the utility model are defined by the claims and their equivalents.
Claims (10)
1. a kind of measurement slight temperature varying circuit, which is characterized in that including temperature collecting module, temperature reference module, temperature
Output module and temperature controller,
The temperature signal output end of temperature collecting module is connected with the first signal input part of temperature output module, temperature controller
The first signal output end be connected with the signal input part of temperature reference module, the signal output end and temperature of temperature reference module
The second signal input terminal of output module is connected, the input adjustable side of the output adjustable side and temperature output module of temperature controller
It is connected,
The temperature signal output end of temperature output module is connected with the temperature signal input of temperature controller.
2. measurement slight temperature varying circuit according to claim 1, which is characterized in that temperature collecting module includes temperature-sensitive
The first end of resistance Rt, thermistor Rt are connected with power ground, the second end of the thermistor Rt first end with resistance R1 respectively
It is connected with the first signal input part of temperature output module, the second end of resistance R1 is connected with the first reference voltage.
3. measurement slight temperature varying circuit according to claim 2, which is characterized in that further include follower U4, follow
The input terminal of device U4 is connected with the second end of thermistor Rt, the output end of follower U4 and the first signal of temperature output module
Input terminal is connected.
4. measurement slight temperature varying circuit according to claim 1, which is characterized in that temperature reference module includes voltage
The signal input part of unit U2, voltage cell U2 are connected with the first signal output end of temperature controller, the electricity of voltage cell U2
Pressure output end is connected with the second signal input terminal of temperature output module.
5. measurement slight temperature varying circuit according to claim 4, which is characterized in that further include adder U5 and M
Voltage cell U3, the M are positive integer,
The reference voltage of i+1 voltage cell U3 is lower than the reference voltage of the i-th voltage cell U3, and the benchmark electricity of voltage cell U2
Pressure is greater than the reference voltage of jth voltage cell U3, and the i is the positive integer less than M, and the j is the positive integer no more than M；
Or/and the voltage resolution of i+1 voltage cell U3 is higher than the voltage resolution of the i-th voltage cell U3, and voltage cell
The voltage resolution of U2 is lower than the voltage resolution of jth voltage cell U3；
The signal input part of jth voltage cell U3 is connected with+1 signal output end of jth of temperature controller, jth voltage cell U3
Signal output end be connected with+1 signal input part of jth of adder,
The signal input part of voltage cell U2 is connected with the first signal output end of temperature controller, and the signal of voltage cell U2 is defeated
Outlet is connected with the first signal input part of adder,
The voltage output end of adder is connected with the second signal input terminal of temperature output module.
6. measurement slight temperature varying circuit according to claim 5, which is characterized in that as M=1,
The reference voltage of voltage cell U2 is greater than the reference voltage of the 1st voltage cell U3,
Or/and the voltage resolution of voltage cell U2 is lower than the voltage resolution of the 1st voltage cell U3；
The signal input part of 1st voltage cell U3 is connected with the 2nd signal output end of temperature controller, the 1st voltage cell U3's
Signal output end is connected with the 2nd signal input part of adder,
The signal input part of voltage cell U2 is connected with the first signal output end of temperature controller, and the signal of voltage cell U2 is defeated
Outlet is connected with the first signal input part of adder,
The voltage output end of adder is connected with the second signal input terminal of temperature output module.
7. measurement slight temperature varying circuit according to claim 1, which is characterized in that temperature output module includes difference
Amplifier U6 and electronic switch U7, the normal phase input end of difference amplifier U6 are exported with the temperature signal of temperature collecting module respectively
End is connected with the first input end X0 of electronic switch U7,
The inverting input terminal of difference amplifier U6 respectively with the signal output end of temperature reference module and electronic switch U7 second
Input terminal X1 is connected, and the output end of difference amplifier U6 is connected with the third input terminal X2 of electronic switch U7, electronic switch U7's
Output end X is connected with the temperature signal input of temperature controller；The input adjustable side of electronic switch U7 and temperature controller
Adjustable side is exported to be connected.
8. measurement slight temperature varying circuit according to claim 1, which is characterized in that temperature controller includes controller
The temperature signal input of U1 and A/D conversion module U8, A/D conversion module U8 and the temperature signal output end of temperature output module
It is connected, the temperature signal output end of A/D conversion module U8 is connected with the temperature signal input of controller U1.
9. measurement slight temperature varying circuit according to claim 2, which is characterized in that the resistance value of thermistor Rt is
The resistance value of 100K or/and resistance R1 are 100K or/and the first reference voltage is 2.5V.
10. measurement slight temperature varying circuit according to claim 7, which is characterized in that difference amplifier amplification 100
Times；
Or/and the reference voltage of voltage cell U2 is 2.5V or/and the reference voltage of the 1st voltage cell U3 is 50mV.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821889105.7U CN208998957U (en) | 2018-11-13 | 2018-11-13 | A kind of measurement slight temperature varying circuit |
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| CN201821889105.7U CN208998957U (en) | 2018-11-13 | 2018-11-13 | A kind of measurement slight temperature varying circuit |
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| CN208998957U true CN208998957U (en) | 2019-06-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405992A (en) * | 2018-11-13 | 2019-03-01 | 上海仪电科学仪器股份有限公司 | A kind of measurement slight temperature varying circuit and its thermometry |
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2018
- 2018-11-13 CN CN201821889105.7U patent/CN208998957U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405992A (en) * | 2018-11-13 | 2019-03-01 | 上海仪电科学仪器股份有限公司 | A kind of measurement slight temperature varying circuit and its thermometry |
| CN109405992B (en) * | 2018-11-13 | 2024-07-12 | 上海仪电科学仪器股份有限公司 | Circuit for measuring tiny temperature change and temperature measuring method thereof |
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