CN211234754U - High-stability temperature acquisition system - Google Patents
High-stability temperature acquisition system Download PDFInfo
- Publication number
- CN211234754U CN211234754U CN201922432242.9U CN201922432242U CN211234754U CN 211234754 U CN211234754 U CN 211234754U CN 201922432242 U CN201922432242 U CN 201922432242U CN 211234754 U CN211234754 U CN 211234754U
- Authority
- CN
- China
- Prior art keywords
- resistor
- voltage
- amplifier
- pin
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000010354 integration Effects 0.000 claims abstract description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims 5
- 238000011105 stabilization Methods 0.000 claims 5
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides a temperature acquisition system of high stability, including data acquisition card, double plug connector, single row plug connector and integration module and temperature sensor, temperature sensor passes through single row plug connector with the integration module is connected, the integration module passes through double plug connector with the data acquisition card is connected. The utility model discloses an integration module makes the signal spread into the back into by temperature sensor, and circuit voltage electric current is stable, and the interference killing feature is strong, does not receive the influence of outside temperature and transmission cable length to follow-up data processing's accuracy and precision have been guaranteed.
Description
Technical Field
The utility model belongs to the technical field of the temperature acquisition and specifically relates to a temperature acquisition system of high stability is related to.
Background
A Pt100 temperature sensor is a meter that converts a temperature variable into a transmittable standardized output signal, mainly used for measurement and control of temperature parameters of industrial processes, and generally consists of two parts: a sensor and a signal converter. The sensor is mainly a thermocouple or a thermal resistor; the signal converter mainly comprises a measuring unit and a signal processing and converting unit (since the industrial thermal resistance and the thermocouple graduation meter are standardized, the signal converter is also called a transmitter when being used as a stand-alone product), and some transmitters are added with a display unit and have field bus functions.
In practical use, the Pt100 temperature sensor has a large measurement error due to the influence of the ambient temperature and the length of the wire harness, so that the subsequent control decision is influenced.
Disclosure of Invention
In order to solve the problem, the utility model provides a temperature acquisition system of high stability.
The main contents of the utility model include:
a high-stability temperature acquisition system comprises a data acquisition card, double-row plug connectors, a single-row plug connector, an integration module and a temperature sensor, wherein the temperature sensor is connected with the integration module through the single-row plug connector, and the integration module is connected with the data acquisition card through the double-row plug connectors; the integration module comprises a voltage stabilizing unit, an operational amplifier unit, an MOS unit and an amplifier unit, wherein the amplifier unit comprises an amplifier chip, the type of the amplifier chip is INA114, a pin 3 and a pin 2 of the amplifier chip are used for being connected with the temperature sensor, and a gain resistance unit is connected between a pin 1 and a pin 8 of the amplifier chip; the MOS unit is connected to pin 2 of the amplifier chip through a calibration circuit.
Preferably, the voltage stabilizing unit comprises a first voltage stabilizing resistor R13, a voltage stabilizing amplifier U1, a second voltage stabilizing resistor R14 and a voltage stabilizing MOS transistor Q1;
the operational amplifier unit comprises a first operational amplifier and a second operational amplifier; the MOS unit comprises a first MOS tube and a second MOS tube;
one end of the first voltage-stabilizing resistor R13 is connected with the pin 15 of the double-row plug connector, the other end of the first voltage-stabilizing resistor R13 is connected with the non-inverting input end of the voltage-stabilizing amplifier U1, and the positive electrode and the negative electrode of the voltage-stabilizing amplifier U1 are connected between 12V power supplies; the inverting input end of the voltage stabilizing amplifier U1 is connected with the inverting input end of the first operational amplifier through a first operational amplifier resistor, and the inverting input end of the voltage stabilizing amplifier U1 is connected with the inverting input end of the second operational amplifier through a second operational amplifier resistor; the output end of the voltage-stabilizing amplifier U1 is connected with the base of a voltage-stabilizing MOS tube Q1 through the second voltage-stabilizing resistor R14, the emitter of the voltage-stabilizing MOS tube Q1 is connected with one end of a third voltage-stabilizing resistor R9, the other end of the third voltage-stabilizing resistor R9 is grounded through a fourth voltage-stabilizing resistor R15, the other end of the third voltage-stabilizing resistor R9 is respectively connected with a first operational amplifier resistor and a second operational amplifier resistor, the first operational amplifier resistor is connected with the non-inverting input end of the first operational amplifier, the second operational amplifier resistor is connected with the non-inverting input end of the second operational amplifier, and the collector of the voltage-stabilizing MOS tube Q1 is connected with a 12V power supply;
the output end of the first operational amplifier is connected with the base electrode of the first MOS tube through a first output resistor, the emitter electrode of the first MOS tube is connected with the reverse input end of the first operational amplifier, and the collector electrode of the first MOS tube and the positive pin of the temperature sensor are connected with the pin 3 of the amplifier chip;
the output end of the second operational amplifier is connected with the base electrode of the second MOS tube through a second output resistor, the emitting electrode of the second MOS tube is connected with the reverse input end of the second operational amplifier, and the collecting electrode of the second MOS tube is connected with the calibration circuit.
Preferably, an RC filter circuit is further disposed between the pin 3 and the pin 2 of the amplifier chip, the filter circuit includes a first filter branch and a second filter branch, and the first filter branch includes a first filter resistor and a second filter resistor connected in series between the pin 3 of the amplifier chip and the collector of the first MOS transistor; the second filtering branch circuit comprises a third filtering resistor and a fourth filtering resistor which are connected between the pin 2 of the amplifier chip and the calibration circuit in series; the circuit of the first filter resistor and the circuit of the second filter resistor are provided with a first connecting point, a second connecting point is arranged between the third filter resistor and the fourth filter resistor, and a first filter capacitor and a second filter capacitor which are connected in parallel are arranged between the first connecting point and the second connecting point.
Preferably, the calibration circuit comprises a first calibration branch and a second calibration branch which are connected in series, one end of the first calibration branch is connected with a negative electrode pin of the temperature sensor, and the second calibration branch is connected with a collector of the second MOS transistor; the first calibration branch circuit comprises a first calibration resistor and a second calibration resistor which are connected in parallel, the second calibration branch circuit comprises a third calibration resistor and a fourth calibration resistor which are connected in parallel, the third calibration resistor is a variable resistor, and a middle pin of the third calibration resistor is connected with the fourth filter resistor.
Preferably, the model of the voltage stabilizing amplifier U1, the first operational amplifier and the second operational amplifier is OP 177; the type of the voltage-stabilizing MOS tube Q1 is C1815.
Preferably, the single-row connector is a 10-pin connector, and the pin 5 and the pin 6 of the single-row connector, and the pin 2 and the pin 3 of the single-row connector are respectively connected with one temperature sensor.
The beneficial effects of the utility model reside in that: the utility model provides a temperature acquisition system of high stability makes the signal spread into the back into by temperature sensor through the integration module, and circuit voltage electric current is stable, and the interference killing feature is strong, does not receive the influence of outside temperature and transmission cable length to follow-up data processing's accuracy and precision have been guaranteed.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
FIG. 3 is a circuit diagram of a voltage regulator unit;
FIG. 4 is a circuit diagram of the operational amplifier unit and the MOS unit;
FIG. 5 is a circuit diagram of an amplifier unit;
FIG. 6 is a schematic view of a single row of connectors;
fig. 7 is a schematic view of a dual row plug.
Detailed Description
The technical solution protected by the present invention will be specifically described below with reference to the accompanying drawings.
Please refer to fig. 1 to 7. The utility model provides a pair of temperature acquisition system of high stability can calculate temperature sensor's true data collection through the integrated circuit, does not receive the influence of external environment temperature change, and stability is high.
As shown in fig. 1, the temperature acquisition system of the present invention includes a data acquisition card, a dual-row connector, a single-row connector, an integration module, and a temperature sensor, wherein the temperature sensor is connected to the integration module through the single-row connector, and the integration module is connected to the data acquisition card through the dual-row connector; specifically, referring to fig. 2, the integrated module includes a voltage stabilizing unit, an operational amplifier unit, an MOS unit, and an amplifier unit, wherein the number of the operational amplifier unit, the number of the MOS unit, and the number of the amplifier unit are two, each temperature sensor is connected with one amplifier unit, the number of the voltage stabilizing units is one, a voltage stabilizing source is provided for the operational amplifier unit and the MOS unit, stable currents generated after passing through the operational amplifier unit and the MOS unit respectively flow to the amplifier unit, so that stable voltage difference is generated inside the amplifier unit, the voltage difference is a voltage difference between the temperature sensor side and the calibration circuit side, the voltage difference is stable and constant, when the temperature sensor is disturbed by the external environment or the cable length such that the collected signal is disturbed, however, the voltage on the calibration circuit side is not changed, and thus the true signal of the temperature sensor can be calculated from the stable voltage difference.
Referring to fig. 3 to 5, the voltage regulator unit is a frame-selected part numbered 10 in fig. 1, the frame-selected part numbered 20 is an operational amplifier unit and a MOS unit corresponding to a temperature sensor, and the frame-selected part numbered 30 is a corresponding amplifier unit; in this embodiment, two temperature sensors are connected, that is, two frame selection parts, namely 20 and 30, are connected to a single-row connector J1, as shown in fig. 6, and pins 1 to 6 of the single-row connector are used to connect two temperature sensors, preferably, the single-row connector is a 10-pin connector, and pin 5 and pin 6 of the single-row connector, pin 2 and pin 3 of the single-row connector are connected to one temperature sensor respectively.
With reference to fig. 3 and 4, the voltage stabilizing unit includes a first voltage stabilizing resistor R13, a voltage stabilizing amplifier U1, a second voltage stabilizing resistor R14, and a voltage stabilizing MOS transistor Q1; the operational amplifier unit comprises a first operational amplifier and a second operational amplifier; the MOS unit comprises a first MOS tube and a second MOS tube.
Specifically, the one end of first voltage-stabilizing resistor R13 with double connector J2's pin 15 is connected, its other end with the noninverting input end of regulator amplifier U1 is connected, wherein, double connector J2 can also provide the electric quantity for whole collection system, passes through like external 12V power double connector J2 supplies power for collection system. The positive electrode and the negative electrode of the voltage stabilizing amplifier U1 are connected between 12V power supplies; the inverting input terminal of the voltage stabilizing amplifier U1 is connected with the inverting input terminal of the first operational amplifier U4 through a first operational amplifier resistor R4, and meanwhile, the inverting input terminal of the voltage stabilizing amplifier U1 is connected with the inverting input terminal of the second operational amplifier U5 through a second operational amplifier resistor R6, namely, the inverting input terminal of the voltage stabilizing amplifier U1 is connected with the operational amplifier unit at a P1 node.
The output end of the voltage-stabilizing amplifier U1 is connected with the base of a voltage-stabilizing MOS tube Q1 through the second voltage-stabilizing resistor R14, the emitter of the voltage-stabilizing MOS tube Q1 is connected with one end of a third voltage-stabilizing resistor R9, the other end of the third voltage-stabilizing resistor R9 is grounded through a fourth voltage-stabilizing resistor R15, the other end of the third voltage-stabilizing resistor R9 is respectively connected with a first operational amplifier resistor R4 and a second operational amplifier resistor R6, the first operational amplifier resistor R4 is connected with the non-inverting input end of the first operational amplifier U4, the second operational amplifier resistor R6 is connected with the non-inverting input end of the second operational amplifier U5, and the collector of the voltage-stabilizing MOS tube Q1 is connected with a 12V power supply;
the output end of the first operational amplifier U4 is connected with the base of the first MOS transistor Q4 through a first output resistor R32, the emitter of the first MOS transistor Q4 is connected with the reverse input end of the first operational amplifier U4, and the collector of the first MOS transistor Q4 and the positive pin (i.e. pin 3 of the single-row plug connector J1) of the temperature sensor are connected with the pin 3 of the amplifier chip U7 together.
The output end of the second operational amplifier U5 is connected to the base of the second MOS transistor Q5 through a second output resistor R47, the emitter of the second MOS transistor Q5 is connected to the inverting input end of the second operational amplifier U5, and the collector of the second MOS transistor Q5 is connected to the calibration circuit.
Referring to fig. 5, the amplifier unit includes an amplifier chip U7, the model of the amplifier chip U7 is INA114, pins 3 and 2 of the amplifier chip U7 are used for connecting to the temperature sensor, and a gain resistor unit is connected between pin 1 and pin 8; the MOS unit is connected to pin 2 of the amplifier chip through a calibration circuit.
Specifically, an RC filter circuit is further disposed between the pin 3 and the pin 2 of the amplifier chip, the filter circuit includes a first filter branch and a second filter branch, and the first filter branch includes a first filter resistor R41 and a second filter resistor R38 connected in series between the pin 3 of the amplifier chip and the collector of the first MOS transistor; the second filtering branch comprises a third filtering resistor R44 and a fourth filtering resistor R45 which are connected between the pin 2 of the amplifier chip U7 and the calibration circuit in series; the circuit of the first filter resistor R41 and the second filter resistor R38 is provided with a first connection point P10, a second connection point P20 is arranged between the third filter resistor R44 and the fourth filter resistor R45, and a first filter capacitor C6 and a second filter capacitor C7 which are connected in parallel are arranged between the first connection point P10 and the second connection point P20.
The calibration circuit comprises a first calibration branch and a second calibration branch which are connected in series, wherein one end of the first calibration branch is connected with a negative terminal pin (namely, a terminal pin 2 of the single-row plug connector J1) of the temperature sensor, and the second calibration branch is connected with a collector electrode of the second MOS transistor Q5; the first calibration branch comprises a first calibration resistor R33 and a second calibration resistor R5 which are connected in parallel, the second calibration branch comprises a third calibration resistor VR2 and a fourth calibration resistor R34 which are connected in parallel, the third calibration resistor VR2 is a variable resistor, and an intermediate pin of the third calibration resistor VR2 is connected with the fourth filter resistor R45.
In one embodiment, the type of the regulated amplifier U1, the first operational amplifier and the second operational amplifier is OP 177; the type of the voltage-stabilizing MOS tube Q1 is C1815.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (6)
1. A high-stability temperature acquisition system is characterized by comprising a data acquisition card, double-row plug connectors, a single-row plug connector, an integration module and a temperature sensor, wherein the temperature sensor is connected with the integration module through the single-row plug connector, and the integration module is connected with the data acquisition card through the double-row plug connectors; the integration module comprises a voltage stabilizing unit, an operational amplifier unit, an MOS unit and an amplifier unit, wherein the amplifier unit comprises an amplifier chip, the type of the amplifier chip is INA114, a pin 3 and a pin 2 of the amplifier chip are used for being connected with the temperature sensor, and a gain resistance unit is connected between a pin 1 and a pin 8 of the amplifier chip; the MOS unit is connected to pin 2 of the amplifier chip through a calibration circuit.
2. The high-stability temperature acquisition system according to claim 1, wherein the voltage stabilization unit comprises a first voltage stabilization resistor R13, a voltage stabilization amplifier U1, a second voltage stabilization resistor R14 and a voltage stabilization MOS tube Q1;
the operational amplifier unit comprises a first operational amplifier and a second operational amplifier; the MOS unit comprises a first MOS tube and a second MOS tube;
one end of the first voltage-stabilizing resistor R13 is connected with the pin 15 of the double-row plug connector, the other end of the first voltage-stabilizing resistor R13 is connected with the non-inverting input end of the voltage-stabilizing amplifier U1, and the positive electrode and the negative electrode of the voltage-stabilizing amplifier U1 are connected between 12V power supplies; the inverting input end of the voltage stabilizing amplifier U1 is connected with the inverting input end of the first operational amplifier through a first operational amplifier resistor, and the inverting input end of the voltage stabilizing amplifier U1 is connected with the inverting input end of the second operational amplifier through a second operational amplifier resistor; the output end of the voltage-stabilizing amplifier U1 is connected with the base of a voltage-stabilizing MOS tube Q1 through the second voltage-stabilizing resistor R14, the emitter of the voltage-stabilizing MOS tube Q1 is connected with one end of a third voltage-stabilizing resistor R9, the other end of the third voltage-stabilizing resistor R9 is grounded through a fourth voltage-stabilizing resistor R15, the other end of the third voltage-stabilizing resistor R9 is respectively connected with a first operational amplifier resistor and a second operational amplifier resistor, the first operational amplifier resistor is connected with the non-inverting input end of the first operational amplifier, the second operational amplifier resistor is connected with the non-inverting input end of the second operational amplifier, and the collector of the voltage-stabilizing MOS tube Q1 is connected with a 12V power supply;
the output end of the first operational amplifier is connected with the base electrode of the first MOS tube through a first output resistor, the emitter electrode of the first MOS tube is connected with the reverse input end of the first operational amplifier, and the collector electrode of the first MOS tube and the positive pin of the temperature sensor are connected with the pin 3 of the amplifier chip;
the output end of the second operational amplifier is connected with the base electrode of the second MOS tube through a second output resistor, the emitting electrode of the second MOS tube is connected with the reverse input end of the second operational amplifier, and the collecting electrode of the second MOS tube is connected with the calibration circuit.
3. The high-stability temperature acquisition system according to claim 2, wherein an RC filter circuit is further disposed between pin 3 and pin 2 of the amplifier chip, the RC filter circuit includes a first filter branch and a second filter branch, the first filter branch includes a first filter resistor and a second filter resistor connected in series between pin 3 of the amplifier chip and the collector of the first MOS transistor; the second filtering branch circuit comprises a third filtering resistor and a fourth filtering resistor which are connected between the pin 2 of the amplifier chip and the calibration circuit in series; the circuit of the first filter resistor and the circuit of the second filter resistor are provided with a first connecting point, a second connecting point is arranged between the third filter resistor and the fourth filter resistor, and a first filter capacitor and a second filter capacitor which are connected in parallel are arranged between the first connecting point and the second connecting point.
4. A high-stability temperature collection system according to claim 3, wherein said calibration circuit comprises a first calibration branch and a second calibration branch connected in series, one end of said first calibration branch is connected to a negative terminal of said temperature sensor, and said second calibration branch is connected to a collector of said second MOS transistor; the first calibration branch circuit comprises a first calibration resistor and a second calibration resistor which are connected in parallel, the second calibration branch circuit comprises a third calibration resistor and a fourth calibration resistor which are connected in parallel, the third calibration resistor is a variable resistor, and a middle pin of the third calibration resistor is connected with the fourth filter resistor.
5. The high-stability temperature acquisition system according to claim 2, wherein the voltage-stabilizing amplifier U1, the first operational amplifier and the second operational amplifier are of type OP 177; the type of the voltage-stabilizing MOS tube Q1 is C1815.
6. The high-stability temperature acquisition system according to claim 1, wherein the single-row connector is a 10-pin connector, and the pin 5 and the pin 6 of the single-row connector, and the pin 2 and the pin 3 of the single-row connector are respectively connected with one temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922432242.9U CN211234754U (en) | 2019-12-30 | 2019-12-30 | High-stability temperature acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922432242.9U CN211234754U (en) | 2019-12-30 | 2019-12-30 | High-stability temperature acquisition system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211234754U true CN211234754U (en) | 2020-08-11 |
Family
ID=71919768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922432242.9U Expired - Fee Related CN211234754U (en) | 2019-12-30 | 2019-12-30 | High-stability temperature acquisition system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211234754U (en) |
-
2019
- 2019-12-30 CN CN201922432242.9U patent/CN211234754U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203241165U (en) | Thermal resistor temperature measurement circuit based on three-wire system | |
| CN211234754U (en) | High-stability temperature acquisition system | |
| US8786296B2 (en) | Resistance-measuring circuit and electronic device using the same | |
| US7146860B2 (en) | Method for temperature compensation of a digital pressure meter | |
| CN117516740A (en) | T-shaped thermocouple signal processing device and method | |
| CN105115619A (en) | Temperature transmitter for thermocouple detection | |
| CN103925949A (en) | Agriculture detection device | |
| US7661305B2 (en) | Airflow detection apparatus | |
| CN216208769U (en) | High-precision online dissolved oxygen measuring instrument | |
| CN211377990U (en) | Sensor signal conditioning circuit | |
| Gajipara et al. | Design of SCADA for real time system with LabVIEW and microcontroller | |
| CN212988631U (en) | Temperature acquisition circuit, control panel and electrical equipment | |
| CN111121999B (en) | Temperature measuring circuit of PT100 resistance core with constant current source | |
| CN212988630U (en) | Temperature acquisition circuit, control panel and electrical equipment | |
| CN220568280U (en) | Pyroelectric infrared temperature measurement system based on MOS (metal oxide semiconductor) tube | |
| CN113820029A (en) | PT100 temperature acquisition circuit for acquisition terminal | |
| CN106482788A (en) | A kind of humiture transducer with radio communication function | |
| CN218765675U (en) | High-precision detection circuit for specific area of platinum resistance sensor | |
| CN215726533U (en) | Wide-range thermocouple vacuum gauge | |
| CN216978170U (en) | Temperature sensor circuit structure | |
| CN206724997U (en) | A kind of humiture transducer with radio communication function | |
| CN217111217U (en) | Wide-adaptability temperature measurement system with power supply compensation | |
| CN219284513U (en) | Temperature detection circuit structure and electronic equipment | |
| CN220105580U (en) | Constant current source circuit of carbon resistance temperature sensor for low-temperature measurement | |
| CN218765673U (en) | Integrated temperature transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200811 |