CN215952797U - Temperature measurement circuit with temperature compensation - Google Patents
Temperature measurement circuit with temperature compensation Download PDFInfo
- Publication number
- CN215952797U CN215952797U CN202122344057.1U CN202122344057U CN215952797U CN 215952797 U CN215952797 U CN 215952797U CN 202122344057 U CN202122344057 U CN 202122344057U CN 215952797 U CN215952797 U CN 215952797U
- Authority
- CN
- China
- Prior art keywords
- temperature
- resistor
- module
- switching tube
- analog
- 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.)
- Active
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model discloses a temperature measuring circuit with temperature compensation, which relates to the technical field of temperature measurement and comprises a temperature detection module, a signal conditioning module, a temperature sensing module, an analog-to-digital conversion module, a main control module, a feedback resistance control module and a display module; the temperature detection module is used for detecting the temperature of an object to be detected, the signal conditioning module is used for conditioning signals, the temperature sensing module is used for detecting the temperature of the temperature detection module, the analog-to-digital conversion module is used for analog-to-digital conversion, the main control module is used for receiving degree signals and outputting control signals, and the feedback resistance control module is used for controlling the feedback resistance. The temperature measuring circuit with temperature compensation adopts the instrument amplifying circuit to process the measured temperature signal, improves the measuring precision, utilizes the integrated circuit to control, forms the automatic control of the temperature to the gain of the instrument amplifying circuit, and compensates the temperature detecting circuit through different temperature intervals.
Description
Technical Field
The utility model relates to the technical field of temperature measurement, in particular to a temperature measurement circuit with temperature compensation.
Background
In industrial and agricultural production, meteorology, the environmental protection, in fields such as scientific research, often need measure and control ambient temperature and object temperature, it has very important effect to measure defeated temperature condition fast accurately, however, temperature detect sensor's sensitivity can reduce along with the rising of temperature, when using in the great environment of temperature variation, reach the high accuracy measurement, must carry out corresponding temperature compensation, present traditional temperature compensation passes through the mode detection temperature condition of thermocouple, the precision of detection is lower, this moment, because temperature sensor compensates and need adopt more accurate temperature sensor to detect, thereby reduce temperature measurement's error.
SUMMERY OF THE UTILITY MODEL
Embodiments of the present invention provide a temperature measurement circuit with temperature compensation to solve the above problems in the background art.
According to an embodiment of the present invention, there is provided a temperature measurement circuit with temperature compensation, including: the temperature detection module, the signal conditioning module, the temperature sensing module, the analog-to-digital conversion module, the main control module, the feedback resistance control module and the display module;
the temperature detection module is used for detecting the temperature of an object to be detected and outputting a first temperature signal;
the signal conditioning module is connected with the output end of the temperature detection module and is used for amplifying and outputting the first temperature signal;
the temperature sensing module is used for detecting the temperature change condition of the temperature detection module and outputting a second temperature signal;
the analog-to-digital conversion module is connected with the output end of the temperature sensing module and is used for converting the second temperature signal into a digital signal;
the main control module is connected with the output end of the analog-to-digital conversion module and the output end of the signal conditioning module, is used for receiving the digital signal output by the analog-to-digital conversion module and the first temperature signal output by the signal conditioning module, and is used for outputting a control signal;
the feedback resistance control module is connected with the first control end of the main control module and is used for controlling the work of the feedback resistance;
and the display module is connected with the second control end of the main control module and used for displaying the detected temperature value and the temperature value after temperature compensation.
Compared with the prior art, the utility model has the beneficial effects that: the temperature measuring circuit with temperature compensation adopts the instrument amplifying circuit to amplify the measured temperature signal, improves the measuring precision, simultaneously utilizes the CMOS temperature sensor to form automatic control of the temperature to the gain of the instrument amplifying circuit through the control of the integrated circuit, utilizes the temperature detecting circuit to compensate through different temperature intervals, realizes the automatic control of the temperature sensitivity of the on-chip circuit system, and has small area, high speed and high integration level compared with the traditional temperature compensating method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a temperature measurement circuit with temperature compensation according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of a signal conditioning module according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a temperature measurement circuit with temperature compensation according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of the feedback resistance control module provided in fig. 3.
Reference numerals: 1. a temperature detection module; 2. a signal conditioning module; 3. a temperature sensing module; 4. an analog-to-digital conversion module; 5. a main control module; 6. a feedback resistance control module; 7. a display module; 8. a power supply module; 201. an instrument amplification unit; 202. and a compensation unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a temperature measurement circuit with temperature compensation, including: the temperature detection module 1, the signal conditioning module 2, the temperature sensing module 3, the analog-to-digital conversion module 4, the main control module 5, the feedback resistance control module 6 and the display module 7;
specifically, the temperature detection module 1 is configured to detect a temperature of an object to be detected and output a first temperature signal;
the input end of the signal conditioning module 2 is connected with the output end of the temperature detection module 1, and is used for amplifying and outputting the first temperature signal;
the temperature sensing module 3 is used for detecting the temperature change condition of the temperature detection module 1 and outputting a second temperature signal;
the input end of the analog-to-digital conversion module 4 is connected with the output end of the temperature sensing module 3 and is used for converting the second temperature signal into a digital signal;
the main control module 5 is connected with the output end of the analog-to-digital conversion module 4 and the output end of the signal conditioning module 2, is used for receiving the digital signal output by the analog-to-digital conversion module 4 and the first temperature signal output by the signal conditioning module 2, and is used for outputting a control signal;
the feedback resistance control module 6 is connected with the first control end of the main control module 5 and is used for controlling the work of the feedback resistance;
and the display module 7 is connected with the second control end of the main control module 5 and used for displaying the detected temperature value and the temperature value after temperature compensation.
In a specific embodiment, the temperature detection module 1 may measure the temperature of the room head to be detected by using a thermocouple RT, or may measure the temperature by using a temperature sensor; the signal conditioning module 2 can adopt an instrument amplifying circuit or a three-level operational amplifier to process the acquired temperature signal, and a phase inverter can be added for improving the gain effect of the package of amplifying circuits; the temperature sensing module 3 can adopt a CMOS temperature sensor to realize the temperature sensing function according to the principle that the voltage difference of the primary emitter levels of the bipolar transistors with different current densities is in direct proportion to the temperature; the analog-to-digital conversion module 4 can use an analog-to-digital converter U2 to convert an analog signal into a digital signal; the main control module 5 can adopt a single chip microcomputer or a Digital Signal Processor (DSP) to receive, process and analyze data and output a control signal and a processed signal; the feedback resistance control module 6 can control the accessed feedback resistance by adopting a control mode of a switching tube so as to change the feedback resistance value; the display module 7 may be an LCD display, which is not described herein.
Example 2: based on embodiment 1, please refer to fig. 2 and fig. 3, in an embodiment of the temperature measurement circuit with temperature compensation according to the present invention, the temperature detection module 1 includes a first power supply +5V, a first resistor R1, a thermocouple RT, a second resistor R2, and a first potentiometer RP 1;
specifically, a first power supply +5V is connected to a first end of the first resistor R1 and a first end of the second resistor R2, a second end of the first resistor R1 is grounded through the thermocouple RT, and a second end of the second resistor R2 is connected to the ground through the first potentiometer RP1 and a slider end of the first potentiometer RP 1.
Example 2: based on embodiment 1, please refer to fig. 2, in an embodiment of the temperature measurement circuit with temperature compensation according to the present invention, the signal conditioning module 2 includes an instrument amplifying unit 201 and a compensating unit 202;
specifically, the instrument amplification unit 201 is configured to amplify the first temperature signal output by the temperature detection module 1;
a compensation unit 202 for optimizing the gain effect of the meter amplification unit 201; the input end of the instrument amplification unit 201 is connected with the output end of the temperature detection module 1, the feedback end of the instrument amplification unit 201 is connected with the output end of the feedback resistance control module 6, the compensation end of the instrument amplification unit 201 is connected with the output end of the compensation unit 202, and the output end of the instrument amplification unit 201 is connected with the modulus end of the main control module 5.
Further, the meter amplifying unit 201 includes a meter amplifier U3; the compensation unit 202 comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first operational amplifier A1;
specifically, the first end of the instrumentation amplifier U3 is connected to the second end of the second resistor R2 and the third resistor R3, the second end of the instrumentation amplifier U3 is connected to the second end of the first resistor R1 and the fourth resistor R4, the second end of the third resistor R3 is connected to the inverting end of the first operational amplifier a1 and the fifth resistor R5, the second end of the fourth resistor R4 is connected to the inverting end of the first operational amplifier a1, the output end of the first operational amplifier a1 is connected to the other end of the fifth resistor R5 and the sixth resistor R6, and the third end of the instrumentation amplifier U3 is connected to the other end of the sixth resistor R6.
Further, the temperature sensing module 3 includes a seventh resistor R7, a first switch tube M1, a second switch tube M2, a third switch tube M3, an eighth resistor R8, a ninth resistor R9, a second operational amplifier a2, a tenth resistor R10, a fourth switch tube N1, a fifth switch tube N2, and a second power supply + 5V;
specifically, the second power supply +5V is connected to the source of the third switching tube M3, the source of the second switching tube M2 and the source of the first switching tube M1, the drain of the second switching tube M2 is connected to the tenth resistor R10 and the non-inverting terminal of the second motion through the eighth resistor R8, the drain of the third switching tube M3 is connected to the inverting terminal of the second operational amplifier a2 and the collector of the fifth switching tube N2 through the ninth resistor R9, the output terminal of the second operational amplifier a2 is connected to the gate of the second switching tube M2, the gate of the third switching tube M3 and the gate of the first switching tube M1, the collector of the fourth switching tube N1 is connected to the other terminal of the tenth resistor R10, the emitter and the base of the fourth switching tube N1, the emitter and the base of the fifth switching tube N2 are all grounded, and the drain of the first switching tube M1 is grounded through the seventh resistor R7.
In a specific embodiment, the instrument amplification can select LMC6062, and the acquired temperature signal is amplified through three-level operational amplifier; the first operational amplifier A1 can select an inverter composed of an OPA2365 operational amplifier, optimize the gain of an instrumentation amplifier U3 and compensate the processed signal to a certain extent; the first switch tube M1, the second switch tube M2 and the third switch tube M3 can be MOS depletion type single-gate P-channel field effect tubes, and the temperature sensing function is realized according to the principle that the voltage difference of the primary emitter level of the MOS depletion type single-gate P-channel field effect tubes with different current densities is in direct proportion to the temperature; the analog-to-digital converter U2 can be ADS 8328; the fourth switching tube N1 and the fifth switching tube N2 may be NPN transistors; the second operational amplifier A2 can be selected from LM358 operational amplifier; the first controller U1 can be an STC series single chip microcomputer, analyzes and processes signals through an internal software system and outputs control signals.
Example 3: in an embodiment of the temperature measurement circuit with temperature compensation according to the utility model, referring to fig. 4 based on embodiment 2, the feedback resistance control module 6 includes an eleventh resistor R11, a twelfth resistor R12, a second potentiometer RP2, a third potentiometer RP3, a fourth potentiometer RP4, a sixth switch tube M4, a seventh switch tube M5, and an eighth switch tube M6;
specifically, the eleventh resistor R11 is connected to the fourth end of the instrumentation amplifier U3, the other end of the eleventh resistor R11 is connected to the second potentiometer RP2 and its slider end, the third potentiometer RP3 and its slider end, the fourth potentiometer RP4 and its slider end, and the twelfth resistor R12, the other end of the second potentiometer RP2 is connected to the drain of the sixth switching tube M4, the other end of the third potentiometer RP3 is connected to the drain of the seventh switching tube M5, the other end of the fourth potentiometer RP4 is connected to the drain of the eighth switching tube M6, the source of the sixth switching tube M4, the source of the seventh switching tube M5, and the source of the eighth switching tube M6 are all grounded, and the other end of the twelfth resistor R12 is connected to the fifth end of the instrumentation amplifier U3.
Further, the main control module 5 includes a first controller U1; the analog-to-digital conversion module 4 comprises an analog-to-digital converter U2;
specifically, an analog-digital end of the first controller U1 is connected to an output end of the analog-digital converter U2, an input end of the analog-digital converter U2 is connected to a drain of the first switch tube M1, a first driving end of the first controller U1 is connected to a gate of the sixth switch tube M4, a second driving end of the first controller U1 is connected to a gate of the seventh switch tube M5, and a third driving end of the first controller U1 is connected to a gate of the eighth switch tube M6.
In an embodiment, the sixth switch M4, the seventh switch M5, and the eighth switch M6 may be N-channel enhancement mode fets, and are controlled by the driving signal output by the first controller U1.
In the embodiment of the utility model, the temperature detection module 1 detects the temperature of an object to be detected, the output temperature signal is amplified through the signal conditioning module 2, the processed temperature data is received by the main control module 5, at the moment, the temperature sensing module 3 detects the temperature of the temperature detection module 1 and outputs the temperature signal, the temperature signal is subjected to analog-to-digital conversion through the analog-to-digital conversion module 4 and is transmitted to the main control module 5, the main control module 5 analyzes and processes the temperature signal output by the analog-to-digital conversion module 4 through an internal software system, so that the feedback resistor control module 6 is controlled to control feedback resistors with different resistance values to be connected into the signal conditioning module 2, the amplification gain effect of the signal conditioning module 2 is changed, the adjustment of the temperature detection precision of the temperature detection module 1 is realized, the automatic control of the on-chip temperature sensitivity is realized, and finally, the temperature signal output by the temperature detection module 1 is amplified by the main control module 5, The temperature signal output by the temperature sensing module 3 and the compensated temperature data are displayed by a display; wherein the signal conditioning module 2 is used for conditioning signals through an instrumentation amplifier U3 and an inverter.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A temperature measurement circuit including temperature compensation, comprising:
the temperature measurement circuit with temperature compensation comprises: the temperature detection module, the signal conditioning module, the temperature sensing module, the analog-to-digital conversion module, the main control module, the feedback resistance control module and the display module;
the temperature detection module is used for detecting the temperature of an object to be detected and outputting a first temperature signal;
the signal conditioning module is connected with the output end of the temperature detection module and is used for amplifying and outputting the first temperature signal;
the temperature sensing module is used for detecting the temperature change condition of the temperature detection module and outputting a second temperature signal;
the analog-to-digital conversion module is connected with the output end of the temperature sensing module and is used for converting the second temperature signal into a digital signal;
the main control module is connected with the output end of the analog-to-digital conversion module and the output end of the signal conditioning module, is used for receiving the digital signal output by the analog-to-digital conversion module and the first temperature signal output by the signal conditioning module, and is used for outputting a control signal;
the feedback resistance control module is connected with the first control end of the main control module and is used for controlling the work of the feedback resistance;
and the display module is connected with the second control end of the main control module and used for displaying the detected temperature value and the temperature value after temperature compensation.
2. The temperature measurement circuit with temperature compensation of claim 1, wherein the temperature detection module comprises a first power supply, a first resistor, a thermocouple, a second resistor, and a first potentiometer;
the first power supply is connected with the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is grounded through the thermocouple, and the second end of the second resistor is connected with the ground end and the slide end of the first potentiometer through the first potentiometer.
3. The temperature measurement circuit with temperature compensation of claim 2, wherein the signal conditioning module comprises an instrument amplification unit and a compensation unit;
the instrument amplifying unit is used for amplifying the first temperature signal output by the temperature detection module;
the compensation unit is used for optimizing the gain effect of the instrument amplification unit;
the input end of the instrument amplification unit is connected with the output end of the temperature detection module, the feedback end of the instrument amplification unit is connected with the output end of the feedback resistance control module, the compensation end of the instrument amplification unit is connected with the output end of the compensation unit, and the output end of the instrument amplification unit is connected with the modulus end of the main control module.
4. The temperature measurement circuit with temperature compensation of claim 3, wherein the meter amplification unit comprises a meter amplifier; the compensation unit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first operational amplifier;
the first end of the instrument amplifier is connected with the second end and the third resistor of the second resistor, the second end of the instrument amplifier is connected with the second end and the fourth resistor of the first resistor, the second end of the third resistor is connected with the inverting terminal and the fifth resistor of the first operational amplifier, the second end of the fourth resistor is connected with the inverting terminal of the first operational amplifier, the output terminal of the first operational amplifier is connected with the other end and the sixth resistor of the fifth resistor, and the third end of the instrument amplifier is connected with the other end of the sixth resistor.
5. The temperature measurement circuit with temperature compensation function according to claim 4, wherein the temperature sensing module comprises a seventh resistor, a first switch tube, a second switch tube, a third switch tube, an eighth resistor, a ninth resistor, a second operational amplifier, a tenth resistor, a fourth switch tube, a fifth switch tube and a second power supply;
the second power supply is connected with a source electrode of a third switching tube, a source electrode of the second switching tube and a source electrode of the first switching tube, a drain electrode of the second switching tube is connected with a tenth resistor and a same-phase end of a second motion through an eighth resistor, a drain electrode of the third switching tube is connected with an inverting end of the second operational amplifier and a collector electrode of the fifth switching tube through a ninth resistor, an output end of the second operational amplifier is connected with a grid electrode of the second switching tube, a grid electrode of the third switching tube and a grid electrode of the first switching tube, a collector electrode of the fourth switching tube is connected with the other end of the tenth resistor, an emitter electrode and a base electrode of the fourth switching tube, an emitter electrode and a base electrode of the fifth switching tube are all grounded, and a drain electrode of the first switching tube is grounded through a seventh resistor.
6. The temperature measurement circuit with temperature compensation according to claim 5, wherein the feedback resistance control module comprises an eleventh resistor, a twelfth resistor, a second potentiometer, a third potentiometer, a fourth potentiometer, a sixth switch tube, a seventh switch tube and an eighth switch tube;
the eleventh resistor is connected with the fourth end of the instrumentation amplifier, the other end of the eleventh resistor is connected with the second potentiometer and the slide end thereof, the third potentiometer and the slide end thereof, the fourth potentiometer and the slide end thereof and the twelfth resistor, the other end of the second potentiometer is connected with the drain electrode of the sixth switching tube, the other end of the third potentiometer is connected with the drain electrode of the seventh switching tube, the other end of the fourth potentiometer is connected with the drain electrode of the eighth switching tube, the source electrode of the sixth switching tube, the source electrode of the seventh switching tube and the source electrode of the eighth switching tube are all grounded, and the other end of the twelfth resistor is connected with the fifth end of the instrumentation amplifier.
7. The temperature measurement circuit with temperature compensation of claim 6, wherein the main control module comprises a first controller; the analog-to-digital conversion module comprises an analog-to-digital converter;
the analog-digital end of the first controller is connected with the output end of the analog-digital converter, the input end of the analog-digital converter is connected with the drain electrode of the first switch tube, the first driving end of the first controller is connected with the grid electrode of the sixth switch tube, the second driving end of the first controller is connected with the grid electrode of the seventh switch tube, and the third driving end of the first controller is connected with the grid electrode of the eighth switch tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122344057.1U CN215952797U (en) | 2021-09-26 | 2021-09-26 | Temperature measurement circuit with temperature compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122344057.1U CN215952797U (en) | 2021-09-26 | 2021-09-26 | Temperature measurement circuit with temperature compensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215952797U true CN215952797U (en) | 2022-03-04 |
Family
ID=80425808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122344057.1U Active CN215952797U (en) | 2021-09-26 | 2021-09-26 | Temperature measurement circuit with temperature compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215952797U (en) |
-
2021
- 2021-09-26 CN CN202122344057.1U patent/CN215952797U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7461974B1 (en) | Beta variation cancellation in temperature sensors | |
| US9389126B2 (en) | Method and apparatus for low cost, high accuracy temperature sensor | |
| CN108225588B (en) | Temperature sensor and temperature detection method | |
| US20210356329A1 (en) | Device and Method for Determining a Temperature or a Temperature-Dependent Value Usable for Determining the Temperature, Temperature Sensor, Pressure Sensor and Combination Sensor | |
| CN103472114B (en) | Multichannel ion sensitive field effect transistor (ISFET) sensor readout circuit with compensation function | |
| CN111595402B (en) | Constant-temperature difference type thermal gas mass flow meter | |
| CN203241165U (en) | Thermal resistor temperature measurement circuit based on three-wire system | |
| CN113951859B (en) | Intracranial pressure sensor signal conditioning method | |
| CN110954229A (en) | Temperature detection circuit, temperature detection equipment, chip and circuit structure | |
| CN114235217A (en) | Method for calibrating CMOS temperature sensor chip based on BJT | |
| CN215952797U (en) | Temperature measurement circuit with temperature compensation | |
| CN104764539A (en) | Universal and output-adjustable thermistor linear compensation circuit based on audion | |
| CN100446417C (en) | Differential circuit for reading out signal of integrated ISFET sensor based on two modes | |
| CN106873702A (en) | A kind of compensation circuit of piezoresistive pressure sensor | |
| CN110108380A (en) | A kind of precise temperature measurement system applied to biphenyl heater box in weaving elasticizer | |
| CN216771582U (en) | Humidity measuring circuit | |
| CN112504494B (en) | Ultra-low power consumption CMOS temperature sensing circuit | |
| CN110440945B (en) | High-precision low-temperature drift discrete type double-matching constant current source temperature measuring circuit | |
| RU147683U1 (en) | MEDICAL THERMOMETER | |
| CN104515611A (en) | Temperature sensing circuit and temperature sensor | |
| CN204422104U (en) | A kind of furnace temperature instrument compensated with oxygen determination | |
| CN217333189U (en) | Constant current source circuit | |
| CN112212987A (en) | Infrared sensitive unit and array temperature measuring circuit thereof | |
| CN211740386U (en) | Sensor signal conditioning circuit based on IEPE (emitter edge detector) adapter for measuring vibration speed | |
| CN113551793B (en) | Temperature detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |