CN205037982U - Utilize constant current source temperature detection circuit of operational amplifier characteristic - Google Patents

Utilize constant current source temperature detection circuit of operational amplifier characteristic Download PDF

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Publication number
CN205037982U
CN205037982U CN201520657236.2U CN201520657236U CN205037982U CN 205037982 U CN205037982 U CN 205037982U CN 201520657236 U CN201520657236 U CN 201520657236U CN 205037982 U CN205037982 U CN 205037982U
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resistance
operational amplifier
circuit
constant
electric capacity
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Expired - Fee Related
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CN201520657236.2U
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周学伟
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Abstract

The utility model relates to an utilize constant current source temperature detection circuit of operational amplifier characteristic, including constant -current source circuit, temperature measurement module and the operational amplifier circuit who connects gradually, the constant -current source circuit is including the voltage stabilizing circuit, constant voltage circuit and the constant current circuit that concatenate in proper order, voltage stabilizing circuit is including the power, first resistance and the steady voltage triode that concatenate in proper order, the constant voltage circuit includes second resistance, third resistance, fourth resistance, the 5th resistance, the tenth resistance, first electric capacity and an operational amplifier, operational amplifier circuit includes the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, second electric capacity, third electric capacity, fourth electric capacity and second operation amplifier the temperature measurement module includes temperature sensor. This utilize constant current source temperature detection circuit of operational amplifier characteristic's electrical circuitry is simple, and the working property is stable, has stronger interference killing feature to the temperature variation.

Description

Utilize the constant flow source measuring circuit temperature of operational amplifier characteristic
Technical field
The utility model relates to a kind of constant flow source measuring circuit temperature utilizing operational amplifier characteristic.
Background technology
In temperature measurement circuit, the antijamming capability of the degree of stability that signal controls and Signal transmissions is a great problem, so generally, temperature measurement circuit all adopts constant current source.
In general constant flow source measuring circuit temperature, its circuit structure all more complicated, components and parts are many, and due to components and parts inevitable for the impact of temperature, so have a certain impact to the performance of temperature measurement circuit.Wherein operational amplifier is also a great problem of constant flow source measuring circuit temperature for the skew of temperature, how to select suitable operational amplifier to be crucial.
Temperature drift coefficient: temperature variation 1 degree Celsius, the variable quantity of resistance.The resistance temperature of 1ppm/ DEG C often changes 1 DEG C, resistance change 1,000,000/.
Utility model content
The technical problems to be solved in the utility model is: in order to overcome the deficiencies in the prior art, provides a kind of constant flow source measuring circuit temperature utilizing operational amplifier characteristic.
The utility model solves the technical scheme that its technical matters adopts: a kind of constant flow source measuring circuit temperature utilizing operational amplifier characteristic, comprises the constant-current source circuit, temperature measurement module and the operational amplification circuit that connect successively;
Described constant-current source circuit comprises the mu balanced circuit, constant voltage circuit and the constant-current circuit that are connected in series successively;
Described mu balanced circuit comprises the power supply, the first resistance and the voltage stabilizing triode that are connected in series successively, described voltage stabilizing triode negative electrode is connected with the first resistance, the plus earth of voltage stabilizing triode, the reference edge of described voltage stabilizing triode is connected with negative electrode and is connected with the input end of constant voltage circuit afterwards;
Described constant voltage circuit comprises the second resistance, 3rd resistance, 4th resistance, 5th resistance, tenth resistance, first electric capacity and the first operational amplifier, the in-phase input end of described first operational amplifier is connected with mu balanced circuit by the 3rd resistance, be connected with constant-current circuit by the 4th resistance, the reverse input end of the first operational amplifier is by the second resistance eutral grounding, be connected with constant-current circuit and the tenth resistance respectively by the 5th resistance, described tenth resistance one end is connected with constant-current circuit, the tenth resistance other end is connected with power supply, the output terminal of the first operational amplifier is connected with constant-current circuit,
Described constant-current circuit comprises the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 15 resistance and triode, the base stage of described triode is connected with the output terminal of the first operational amplifier by the 15 resistance, the collector of described triode is connected with power supply, described 4th resistance and the tenth resistor coupled in parallel are at the emitter of triode, described 6th resistance, the 7th resistance, the 8th resistance and the 9th resistor coupled in parallel are arranged between the 4th resistance and the tenth resistance, and described tenth resistance is connected with temperature measurement module;
Described temperature measurement module comprises temperature sensor, and described temperature sensor one end is connected with constant-current circuit, the other end ground connection of temperature sensor;
Described operational amplification circuit comprises the 11 resistance, 12 resistance, 13 resistance, 14 resistance, second electric capacity, 3rd electric capacity, 4th electric capacity and the second operational amplifier, the reverse input end of described second operational amplifier is by the 12 resistance eutral grounding, be connected with its output terminal by the 13 resistance, the in-phase input end of the second operational amplifier is connected with the tenth resistance by the 11 resistance, described second electric capacity and the 3rd Capacitance parallel connection are between the 11 resistance and the second operational amplifier, described second electric capacity is all connected with ground wire with the 3rd electric capacity, described 4th electric capacity one end ground connection, the other end of the 4th electric capacity is connected with the output terminal of the second operational amplifier by the 14 resistance, ADC thermal resistor signal acquisition module is connected with between described 14 resistance and the 4th electric capacity.
Particularly, the model of described first operational amplifier and the second operational amplifier is LM2904, and resistance temperature drift coefficient is 5ppm.
Particularly, the model of described temperature sensor is PT100.
Particularly, described power supply is 5V DC voltage.
The beneficial effects of the utility model are, this utilizes the circuit theory of the constant flow source measuring circuit temperature of operational amplifier characteristic simple, and stable work in work, has stronger antijamming capability to temperature variation.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the circuit theory diagrams that the utility model utilizes the constant flow source measuring circuit temperature of operational amplifier characteristic;
In figure: 1. constant-current source circuit, 2. operational amplification circuit, 11. mu balanced circuits, 12. constant voltage circuits, 13. constant-current circuits, R1. the first resistance, R2. the second resistance, R3. the 3rd resistance, R4. the 4th resistance, R5. the 5th resistance, R6. the 6th resistance, R7. the 7th resistance, R8. the 8th resistance, R9. the 9th resistance, R10. the tenth resistance, R11. the 11 resistance, R12. the 12 resistance, R13. the 13 resistance, R14. the 14 resistance, U1. voltage stabilizing triode, U2. the first operational amplifier, U3. the second operational amplifier, T. temperature sensor, Q. triode, C1. the first electric capacity, C2. the second electric capacity, C3. the 3rd electric capacity, C4. the 4th electric capacity.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
As shown in Figure 1, a kind of constant flow source measuring circuit temperature utilizing operational amplifier characteristic, comprises constant-current source circuit 1, temperature measurement module and the operational amplification circuit 2 connected successively;
Described constant-current source circuit 1 comprises the mu balanced circuit 11, constant voltage circuit 12 and the constant-current circuit 13 that are connected in series successively;
Described mu balanced circuit 11 comprises the power supply, the first resistance R1 and the voltage stabilizing triode U1 that are connected in series successively, described voltage stabilizing triode U1 negative electrode is connected with the first resistance R1, the plus earth of voltage stabilizing triode U1, the reference edge of described voltage stabilizing triode U1 is connected with negative electrode and is connected with the input end of constant voltage circuit 12 afterwards;
Described constant voltage circuit 12 comprises the second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, tenth resistance R10, first electric capacity C1 and the first operational amplifier U2, the in-phase input end of described first operational amplifier U2 is connected with mu balanced circuit 11 by the 3rd resistance R3, be connected with constant-current circuit 13 by the 4th resistance R4, the reverse input end of the first operational amplifier U2 is by the second resistance R2 ground connection, be connected with constant-current circuit 13 and the tenth resistance R10 respectively by the 5th resistance R5, described tenth resistance R10 one end is connected with constant-current circuit 13, the tenth resistance R10 other end is connected with power supply, the output terminal of the first operational amplifier U2 is connected with constant-current circuit 13,
Described constant-current circuit 13 comprises the 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, 15 resistance R15 and triode Q, the base stage of described triode Q is connected with the output terminal of the first operational amplifier U2 by the 15 resistance R15, the collector of described triode Q is connected with power supply, described 4th resistance R4 and the tenth resistance R10 is connected in parallel on the emitter of triode Q, described 6th resistance R6, 7th resistance R7, 8th resistance R8 and the 9th resistance R9 is arranged in parallel between the 4th resistance R4 and the tenth resistance R10, described tenth resistance R10 is connected with temperature measurement module,
Described temperature measurement module comprises temperature sensor T, and described temperature sensor T one end is connected with constant-current circuit 13, the other end ground connection of temperature sensor T;
Described operational amplification circuit comprises the 11 resistance R11, 12 resistance R12, 13 resistance R13, 14 resistance R14, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C3 and the second operational amplifier U3, the reverse input end of described second operational amplifier U3 is by the 12 resistance R12 ground connection, be connected with its output terminal by the 13 resistance R13, the in-phase input end of the second operation amplifier U3 is connected with the tenth resistance R10 by the 11 resistance R11, described second electric capacity C2 and the 3rd electric capacity C3 is connected in parallel between the 11 resistance R11 and the second operational amplifier U3, described second electric capacity C2 is all connected with ground wire with the 3rd electric capacity C3, described 4th electric capacity C3 one end ground connection, the other end of the 4th electric capacity C3 is connected with the output terminal of the second operational amplifier U3 by the 14 resistance R14, ADC thermal resistor signal acquisition module is connected with between described 14 resistance R14 and the 4th electric capacity C4.
Particularly, the model of described first operational amplifier U2 and the second operational amplifier U3 is LM2904, and resistance temperature drift coefficient is 5ppm.
Particularly, the model of described temperature sensor T is PT100.
This utilizes the constant flow source measuring circuit temperature of operational amplifier characteristic to export constant direct current by constant-current source circuit 1, then through temperature measurement module, utilize temperature sensor T according to the characteristic of resistance along with temperature variation, export regular magnitude of voltage, and then carry out gathering and amplifying through operational amplification circuit 2, finally be sent to ADC thermal resistor signal acquisition module, obtain scene temperature.
In mu balanced circuit 11, the series circuit external direct current 5V power supply that the first resistance R1 and voltage stabilizing triode U1 forms, then ground connection, and the 2.5V DC voltage of direct current 5V power supply stable output after voltage stabilizing triode U1.
In constant voltage circuit 12,2.5V DC voltage is connected dividing potential drop with the series loop of the tenth resistance R10 with 5V DC voltage by the 3rd resistance R3, the 5th resistance R5, then utilize the short characteristic of the void of operational amplifier, the magnitude of voltage that can obtain the in-phase input end of the first operational amplifier U2 and inverting input is equal; First operational amplifier U2 connects 5V DC voltage power supply by the first electric capacity C1, and the first electric capacity C1 is used for the filtering of the 5V power supply of the first operational amplifier U2.
In constant-current circuit 13, controlled the normal work of triode Q by the output signal of the output terminal of the first operational amplifier U2 of constant voltage circuit, thus constant-current circuit 13 is normally worked.
In operational amplification circuit 2, the regular magnitude of voltage that temperature measurement module exports is after the second electric capacity C2 and the 3rd electric capacity C3 filtering, the short characteristic of void of recycling operational amplifier, the magnitude of voltage of the in-phase input end of the second operational amplifier U3 and the inverting input of the second operational amplifier U3 is equal, the magnitude of voltage of the output terminal of the second operational amplifier U3 is tried to achieve again according to series voltage voltage division formulas, the filtering of last 4th electric capacity C4 enters into ADC thermal resistor signal acquisition module, by calculating on-the-spot temperature.
This circuit adopts LM2904 type operational amplifier, and this amplifier has certain antijamming capability for temperature, has certain guarantee, thus improve the antijamming capability of this temperature measurement circuit for the signal waveform quality exported.
Compared with prior art, this utilizes the circuit theory of the constant flow source measuring circuit temperature of operational amplifier characteristic simple, and stable work in work, has stronger antijamming capability to temperature variation.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on instructions, must determine its technical scope according to right.

Claims (4)

1. utilize a constant flow source measuring circuit temperature for operational amplifier characteristic, it is characterized in that, comprise the constant-current source circuit, temperature measurement module and the operational amplification circuit that connect successively;
Described constant-current source circuit comprises the mu balanced circuit, constant voltage circuit and the constant-current circuit that are connected in series successively;
Described mu balanced circuit comprises the power supply, the first resistance and the voltage stabilizing triode that are connected in series successively, described voltage stabilizing triode negative electrode is connected with the first resistance, the plus earth of voltage stabilizing triode, the reference edge of described voltage stabilizing triode is connected with negative electrode and is connected with the input end of constant voltage circuit afterwards;
Described constant voltage circuit comprises the second resistance, 3rd resistance, 4th resistance, 5th resistance, tenth resistance, first electric capacity and the first operational amplifier, the in-phase input end of described first operational amplifier is connected with mu balanced circuit by the 3rd resistance, be connected with constant-current circuit by the 4th resistance, the reverse input end of the first operational amplifier is by the second resistance eutral grounding, be connected with constant-current circuit and the tenth resistance respectively by the 5th resistance, described tenth resistance one end is connected with constant-current circuit, the tenth resistance other end is connected with power supply, the output terminal of the first operational amplifier is connected with constant-current circuit,
Described constant-current circuit comprises the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 15 resistance and triode, the base stage of described triode is connected with the output terminal of the first operational amplifier by the 15 resistance, the collector of described triode is connected with power supply, described 4th resistance and the tenth resistor coupled in parallel are at the emitter of triode, described 6th resistance, the 7th resistance, the 8th resistance and the 9th resistor coupled in parallel are arranged between the 4th resistance and the tenth resistance, and described tenth resistance is connected with temperature measurement module;
Described temperature measurement module comprises temperature sensor, and described temperature sensor one end is connected with constant-current circuit, the other end ground connection of temperature sensor;
Described operational amplification circuit comprises the 11 resistance, 12 resistance, 13 resistance, 14 resistance, second electric capacity, 3rd electric capacity, 4th electric capacity and the second operational amplifier, the reverse input end of described second operational amplifier is by the 12 resistance eutral grounding, be connected with its output terminal by the 13 resistance, the in-phase input end of the second operational amplifier is connected with the tenth resistance by the 11 resistance, described second electric capacity and the 3rd Capacitance parallel connection are between the 11 resistance and the second operational amplifier, described second electric capacity is all connected with ground wire with the 3rd electric capacity, described 4th electric capacity one end ground connection, the other end of the 4th electric capacity is connected with the output terminal of the second operational amplifier by the 14 resistance, ADC thermal resistor signal acquisition module is connected with between described 14 resistance and the 4th electric capacity.
2. utilize the constant flow source measuring circuit temperature of operational amplifier characteristic as claimed in claim 1, it is characterized in that, the model of described first operational amplifier and the second operational amplifier is LM2904, and resistance temperature drift coefficient is 5ppm.
3. utilize the constant flow source measuring circuit temperature of operational amplifier characteristic as claimed in claim 1, it is characterized in that, the model of described temperature sensor is PT100.
4. utilize the constant flow source measuring circuit temperature of operational amplifier characteristic as claimed in claim 1, it is characterized in that, described power supply is 5V DC voltage.
CN201520657236.2U 2015-08-27 2015-08-27 Utilize constant current source temperature detection circuit of operational amplifier characteristic Expired - Fee Related CN205037982U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109357781A (en) * 2018-12-10 2019-02-19 中国航发南方工业有限公司 Resistance and temperature signal conditioning circuit and electronic controller
CN109714054A (en) * 2018-12-11 2019-05-03 西安航天精密机电研究所 Constant-current source circuit and the discrete I/F analog to digital conversion circuit of ternary with constant-current source circuit
CN111121999A (en) * 2019-11-13 2020-05-08 江苏弘历电气有限公司 Temperature measuring circuit of PT100 resistance core with constant current source
CN116931638A (en) * 2023-07-26 2023-10-24 上海菲莱测试技术有限公司 Constant current source circuit and chip aging test method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109357781A (en) * 2018-12-10 2019-02-19 中国航发南方工业有限公司 Resistance and temperature signal conditioning circuit and electronic controller
CN109714054A (en) * 2018-12-11 2019-05-03 西安航天精密机电研究所 Constant-current source circuit and the discrete I/F analog to digital conversion circuit of ternary with constant-current source circuit
CN109714054B (en) * 2018-12-11 2023-03-03 西安航天精密机电研究所 Constant current source circuit and ternary discrete I/F analog-to-digital conversion circuit with same
CN111121999A (en) * 2019-11-13 2020-05-08 江苏弘历电气有限公司 Temperature measuring circuit of PT100 resistance core with constant current source
CN111121999B (en) * 2019-11-13 2021-06-22 江苏弘历电气有限公司 Temperature measuring circuit of PT100 resistance core with constant current source
CN116931638A (en) * 2023-07-26 2023-10-24 上海菲莱测试技术有限公司 Constant current source circuit and chip aging test method
CN116931638B (en) * 2023-07-26 2024-04-09 上海菲莱测试技术有限公司 Constant current source circuit and chip aging test method

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20160217

Termination date: 20180827