CN104568194A - Temperature transducer circuit adopting operational amplifier as voltage follower - Google Patents
Temperature transducer circuit adopting operational amplifier as voltage follower Download PDFInfo
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- CN104568194A CN104568194A CN201410652197.7A CN201410652197A CN104568194A CN 104568194 A CN104568194 A CN 104568194A CN 201410652197 A CN201410652197 A CN 201410652197A CN 104568194 A CN104568194 A CN 104568194A
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Abstract
The invention discloses a temperature transducer circuit adopting an operational amplifier as a voltage follower. The temperature transducer circuit comprises a temperature transducer, a diode, first to eighth resistors, first to third operational amplifiers and a capacitor which are connected with each other. According to the invention, as the AD590 temperature transducer is adopted, the temperature transducer circuit has excellent linearity and interchangeability as well as the feature for removing power-supply fluctuation, and is high in measurement accuracy. An external circuit is adopted to convert current output into voltage output; in addition, the operational amplifier LM124 is adopted as the accessed voltage follower in the circuit and connects an output signal to an analog channel of a data acquisition module to improve the data accuracy.
Description
Technical field
The invention discloses a kind of operational amplifier that utilizes as the temperature sensor circuit of voltage follower, relate to the technical field of circuit design of sensor.
Background technology
Temperature sensor (temperature transducer) refers to can experience temperature and the sensor converting usable output signal to.Temperature sensor is the core of temperature measuring instrument, various in style.Contact and contactless two large classes can be divided into by metering system, be divided into thermal resistance and thermopair two class according to sensor material and electron component characteristic.
Temperature sensor usual in prior art comprises semiconductor thermocouple sensor, PN junction temperature sensor and integrated temperature sensor.Corresponding, according to the interaction rule of ripple and material, in succession develop acoustics temperature sensor, infrared sensor and microwave remote sensor.Temperature sensor is one the most conventional in omnifarious various sensor, modern temperature sensor profile very little, so more allowing it be widely used in the every field of production practices, is also that the life of people provides countless facilities and function.Temperature sensor has four kinds of main Types: thermopair, thermistor, resistance temperature detector (RTD) and IC temperature sensor.IC temperature sensor comprises again modulating output and numeral exports two types.Metal is along with temperature variation, and its resistance value also changes.For different metal, temperature was once often changing, and resistance change is different, and resistance value can directly as output signal.
Patent of invention " temperature sensor " application number is: 201210465586.X, disclosed temperature sensor, and its concrete circuit structure undeclared.
Sensor circuit measuring accuracy conventional in prior art is generally poor, and the accuracy of data acquisition is inadequate.
Summary of the invention
Technical matters to be solved by this invention is: for the defect of prior art, provides a kind of operational amplifier that utilizes as the temperature sensor circuit of voltage follower.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Utilize operational amplifier as a temperature sensor circuit for voltage follower, comprise temperature sensor, diode, the first to the 8th resistance, the first to the 3rd operational amplifier and electric capacity, wherein,
One end of described first resistance is connected with external voltage end, the other end of the first resistance respectively with the negative pole of diode, one end of second resistance is connected, the plus earth of diode, the other end of the second resistance is connected with one end of the 3rd resistance, the other end ground connection of the 3rd resistance, the adjustable end of the 3rd resistance is connected with the positive input terminal of the first operational amplifier, the output terminal of negative input end respectively with the first operational amplifier of the first operational amplifier, one end of 7th resistance is connected, the negative input end of the other end respectively with the second operational amplifier of the 7th resistance, one end of 8th resistance is connected, the output terminal of the other end respectively with the second operational amplifier of the 8th resistance, one end of electric capacity is connected and as the output terminal of circuit, the other end ground connection of electric capacity,
One end of described temperature sensor is connected with external voltage end, the positive input terminal of the other end the respectively with three operational amplifier of temperature sensor, one end of 4th resistance is connected, the other end ground connection of the 4th resistance, the output terminal of negative input end the respectively with three operational amplifier of the 3rd operational amplifier, one end of 5th resistance is connected, one end of the other end the respectively with six resistance of the 5th resistance, the positive input terminal of the second operational amplifier is connected, the other end ground connection of the 6th resistance, the upper pull end of the second operational amplifier is connected with external voltage end, the drop-down end ground connection of the second operational amplifier.
As present invention further optimization scheme, the model of described diode is 6TQ045S.
As present invention further optimization scheme, the model of the described first to the 3rd operational amplifier is LM124-NSC.
As present invention further optimization scheme, described 3rd resistance is adjustable resistance, and range is 50 kilo-ohms.
As present invention further optimization scheme, the size of described electric capacity is 0.1 μ F.
The present invention adopts above technical scheme compared with prior art, has following technique effect: the present invention adopts AD590 temperature sensor, and have good linear and interchangeability, measuring accuracy is high, and has the characteristic eliminating power-supply fluctuation.By external circuits, electric current output is changed into voltage to export, meanwhile, adopt amplifier LM124 as the voltage follower of access in circuit, the analog channel of output signal access data acquisition module, improve the accuracy of data.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention,
Wherein: D1 is diode, R1 to R8 is respectively the first to the 8th resistance, and U1 to U3 is respectively the first to the 3rd operational amplifier, and C1 is electric capacity, and VDD is external voltage end.
Embodiment
Be described below in detail embodiments of the present invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Those skilled in the art of the present technique are understandable that, the correlation module related in the present invention and the function of realization thereof are the devices of hardware after improvement and formation thereof, device or system carry computer software programs conventional in prior art or pertinent protocols just can realize, and are not improve computer software programs of the prior art or pertinent protocols.Such as, the computer hardware system after improvement still can realize the specific function of this hardware system by loading existing operation system of software.Therefore, be understandable that, innovation of the present invention is the improvement of hardware module in prior art and connects syntagmatic, but not be only in hardware module for realizing the improvement of software or the agreement of carrying about function.
Those skilled in the art of the present technique are understandable that, the correlation module mentioned in the present invention is the one or more hardware device for performing in step in operation, method, flow process described in the application, measure, scheme.Described hardware device for required object and specialized designs and manufacture, or also can adopt the known device in multi-purpose computer or other known hardware devices.Described multi-purpose computer activates or reconstructs with having storage procedure Selection within it.
Those skilled in the art of the present technique are appreciated that unless expressly stated, and singulative used herein " ", " one ", " described " and " being somebody's turn to do " also can comprise plural form.Should be further understood that, the wording used in instructions of the present invention " comprises " and refers to there is described feature, integer, step, operation, element and/or assembly, but does not get rid of and exist or add other features one or more, integer, step, operation, element, assembly and/or their group.Should be appreciated that, when we claim element to be " connected " or " coupling " to another element time, it can be directly connected or coupled to other elements, or also can there is intermediary element.In addition, " connection " used herein or " coupling " can comprise wireless connections or couple.Wording "and/or" used herein comprises one or more arbitrary unit listing item be associated and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, the described operational amplifier that utilizes, as the temperature sensor circuit of voltage follower, comprises temperature sensor, diode, the first to the 8th resistance, the first to the 3rd operational amplifier and electric capacity to electrical block diagram of the present invention, wherein,
One end of described first resistance is connected with external voltage end, the other end of the first resistance respectively with the negative pole of diode, one end of second resistance is connected, the plus earth of diode, the other end of the second resistance is connected with one end of the 3rd resistance, the other end ground connection of the 3rd resistance, the adjustable end of the 3rd resistance is connected with the positive input terminal of the first operational amplifier, the output terminal of negative input end respectively with the first operational amplifier of the first operational amplifier, one end of 7th resistance is connected, the negative input end of the other end respectively with the second operational amplifier of the 7th resistance, one end of 8th resistance is connected, the output terminal of the other end respectively with the second operational amplifier of the 8th resistance, one end of electric capacity is connected and as the output terminal of circuit, the other end ground connection of electric capacity,
One end of described temperature sensor is connected with external voltage end, the positive input terminal of the other end the respectively with three operational amplifier of temperature sensor, one end of 4th resistance is connected, the other end ground connection of the 4th resistance, the output terminal of negative input end the respectively with three operational amplifier of the 3rd operational amplifier, one end of 5th resistance is connected, one end of the other end the respectively with six resistance of the 5th resistance, the positive input terminal of the second operational amplifier is connected, the other end ground connection of the 6th resistance, the upper pull end of the second operational amplifier is connected with external voltage end, the drop-down end ground connection of the second operational amplifier.
As present invention further optimization scheme, the model of described diode is 6TQ045S.
As present invention further optimization scheme, the model of the described first to the 3rd operational amplifier is LM124-NSC.
As present invention further optimization scheme, described 3rd resistance is adjustable resistance, and range is 50 kilo-ohms.
As present invention further optimization scheme, the size of described electric capacity is 0.1 μ F.
In the present invention, temperature sensor employing be AD590.AD590 is the current-output type two ends temperature sensor that AD company utilizes PN forward current and temperature relation to make, in dut temperature one timing, this device is equivalent to a constant current source, and AD590 has good linear and interchangeability, measuring accuracy is high, and has the characteristic eliminating power-supply fluctuation.By external circuits, electric current output is changed into voltage to export, simultaneously in order to the accuracy of data, also connect voltage follower in this circuit, adopt amplifier LM124.The analog channel of output signal access data acquisition module.
In the circuit that the present invention realizes, temperature often increases by 1 DEG C, and electric current increases by 1 μ A, and voltage increases 0.01V thereupon.Because the output of AD590 is with absolute temperature zero degree (-273 DEG C) for benchmark, so when room temperature 20 DEG C, its output current is (273+20)=293 μ A, and its magnitude of voltage exported is (10K × 293 μ A)=2.93V.Namely the pass of temperature and output voltage is:
t=Vo×102?273；
Wherein, t is temperature, and unit is DEG C; Vo is output voltage values, and unit is V.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to technical spirit of the present invention, within the spirit and principles in the present invention, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection domain all still belonging to technical solution of the present invention.
Claims (5)
1. utilize operational amplifier as a temperature sensor circuit for voltage follower, it is characterized in that: comprise temperature sensor, diode, the first to the 8th resistance, the first to the 3rd operational amplifier and electric capacity, wherein,
One end of described first resistance is connected with external voltage end, the other end of the first resistance respectively with the negative pole of diode, one end of second resistance is connected, the plus earth of diode, the other end of the second resistance is connected with one end of the 3rd resistance, the other end ground connection of the 3rd resistance, the adjustable end of the 3rd resistance is connected with the positive input terminal of the first operational amplifier, the output terminal of negative input end respectively with the first operational amplifier of the first operational amplifier, one end of 7th resistance is connected, the negative input end of the other end respectively with the second operational amplifier of the 7th resistance, one end of 8th resistance is connected, the output terminal of the other end respectively with the second operational amplifier of the 8th resistance, one end of electric capacity is connected and as the output terminal of circuit, the other end ground connection of electric capacity,
One end of described temperature sensor is connected with external voltage end, the positive input terminal of the other end the respectively with three operational amplifier of temperature sensor, one end of 4th resistance is connected, the other end ground connection of the 4th resistance, the output terminal of negative input end the respectively with three operational amplifier of the 3rd operational amplifier, one end of 5th resistance is connected, one end of the other end the respectively with six resistance of the 5th resistance, the positive input terminal of the second operational amplifier is connected, the other end ground connection of the 6th resistance, the upper pull end of the second operational amplifier is connected with external voltage end, the drop-down end ground connection of the second operational amplifier.
2. a kind of operational amplifier that utilizes, as the temperature sensor circuit of voltage follower, is characterized in that as claimed in claim 1: the model of described diode is 6TQ045S.
3. a kind of operational amplifier that utilizes, as the temperature sensor circuit of voltage follower, is characterized in that as claimed in claim 1: the model of the described first to the 3rd operational amplifier is LM124-NSC.
4. a kind of operational amplifier that utilizes, as the temperature sensor circuit of voltage follower, is characterized in that as claimed in claim 1: described 3rd resistance is adjustable resistance, and range is 50 kilo-ohms.
5. a kind of operational amplifier that utilizes, as the temperature sensor circuit of voltage follower, is characterized in that as claimed in claim 1: the size of described electric capacity is 0.1 μ F.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410652197.7A CN104568194A (en) | 2014-11-18 | 2014-11-18 | Temperature transducer circuit adopting operational amplifier as voltage follower |
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| CN201410652197.7A CN104568194A (en) | 2014-11-18 | 2014-11-18 | Temperature transducer circuit adopting operational amplifier as voltage follower |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106055010A (en) * | 2016-06-21 | 2016-10-26 | 南开大学 | Large-slope temperature sensor circuit having repairing and adjustment function |
| CN106199978A (en) * | 2016-07-21 | 2016-12-07 | 刘光旭 | A kind of sight sheet devices for medical image of good heat dissipation effect |
| WO2022105247A1 (en) * | 2020-11-20 | 2022-05-27 | 华润微集成电路(无锡)有限公司 | Circuit structure for achieving multiplexing of pin of circuit |
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| CN201732304U (en) * | 2009-12-10 | 2011-02-02 | 浙江大学 | Bluetooth technology based multi-point temperature monitoring system |
| CN103057099A (en) * | 2013-01-06 | 2013-04-24 | 富通集团有限公司 | Temperature detection circuit for extruding machine cylinder |
| CN103658000A (en) * | 2013-11-28 | 2014-03-26 | 东北师范大学 | SCM-controlled (single-chip microcomputer) soil-animal separator |
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2014
- 2014-11-18 CN CN201410652197.7A patent/CN104568194A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201732304U (en) * | 2009-12-10 | 2011-02-02 | 浙江大学 | Bluetooth technology based multi-point temperature monitoring system |
| CN103057099A (en) * | 2013-01-06 | 2013-04-24 | 富通集团有限公司 | Temperature detection circuit for extruding machine cylinder |
| CN103658000A (en) * | 2013-11-28 | 2014-03-26 | 东北师范大学 | SCM-controlled (single-chip microcomputer) soil-animal separator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106055010A (en) * | 2016-06-21 | 2016-10-26 | 南开大学 | Large-slope temperature sensor circuit having repairing and adjustment function |
| CN106199978A (en) * | 2016-07-21 | 2016-12-07 | 刘光旭 | A kind of sight sheet devices for medical image of good heat dissipation effect |
| WO2022105247A1 (en) * | 2020-11-20 | 2022-05-27 | 华润微集成电路(无锡)有限公司 | Circuit structure for achieving multiplexing of pin of circuit |
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Application publication date: 20150429 |