CN102478438A - Thermal resistance analog calibration system for signal simulation system - Google Patents
Thermal resistance analog calibration system for signal simulation system Download PDFInfo
- Publication number
- CN102478438A CN102478438A CN2010105555408A CN201010555540A CN102478438A CN 102478438 A CN102478438 A CN 102478438A CN 2010105555408 A CN2010105555408 A CN 2010105555408A CN 201010555540 A CN201010555540 A CN 201010555540A CN 102478438 A CN102478438 A CN 102478438A
- Authority
- CN
- China
- Prior art keywords
- thermal resistance
- circuit
- differential amplifier
- amplifier circuit
- resistance simulation
- 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.)
- Pending
Links
Images
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a thermal resistance analog calibration system for a signal simulation system, wherein the thermal resistance analog calibration system for the signal simulation system comprises a DSP (Digital Signal Processor) controller, a constant current source circuit, a thermal resistor, a thermal resistance analog circuit, a first differential amplification circuit, a second differential amplifications circuit and a third differential amplification circuit, wherein an output end of the DSP controller is connected with the constant current source circuit and the thermal resistance analog circuit, and the input end of the DSP controller is connected with output ends of the first differential amplification circuit and the third differential amplification circuit; an output end of the constant current source circuit is connected with an input end of the thermal resistance analog circuit via the thermal resistor; the first differential amplification circuit is in parallel connection to two ends of the thermal resistor, and the second differential amplification circuit is in parallel connection to two ends of the thermal resistance analog circuit; and output ends of the first differential amplification circuit and the second differential amplification circuit are connected with an input end of the third differential amplification circuit. The thermal resistance analog calibration system for the signal simulation system disclosed by the invention is capable of completely calibrating errors caused by sensor wiring, calculations and measurements, increasing temperature detection precision and ensuring precision of signal simulation.
Description
Technical field
The present invention relates to a kind of thermal resistance simulation and calibration system, be specifically related to a kind of thermal resistance simulation and calibration system that is used for signal emulation system.
Background technology
Signal emulation system is an Electronic Control production production run in enormous quantities, is used for various devices are carried out the equipment of burn-in screen, uses this equipment can improve the efficient of signal simulation, guarantees the quality of signal simulation, has avoided the various defectives of artificial screening.
Because the burn-in screen of signal emulation system is carried out under condition of different temperatures, the temperature detection of each link is most important.Measure the error that causes by sensor wiring with calculating,, reduce the accuracy of signal simulation the adversely effecting temp accuracy of detection.
Summary of the invention
Technical matters to be solved by this invention provides a kind of thermal resistance simulation and calibration system that is used for signal emulation system, and it can the absolute calibration sensor wiring measure the error that causes with calculating, and improves temperature detecting precision, guarantees the accuracy of signal simulation.
In order to solve above technical matters, the invention provides a kind of thermal resistance simulation and calibration system that is used for signal emulation system, comprising:
Dsp controller; Output terminal connects constant-current source circuit and thermal resistance simulation circuit; Input end connects the output terminal of first differential amplifier circuit and the 3rd differential amplifier circuit; Be used to export given current value and give constant-current source circuit, and export corresponding resistance value according to standard temperature and give the thermal resistance simulation circuit, this dsp controller is gathered the output signal of first differential amplifier circuit and the 3rd differential amplifier circuit respectively;
Said constant-current source circuit; Input end connects said dsp controller; Input end connects said thermal resistance simulation circuit through thermal resistance; Said constant-current source circuit is used for obtaining electric energy from power Vcc, and according to the given current values that dsp controller provides, produces the corresponding steady current that flows through thermal resistance and thermal resistance simulation circuit;
Said thermal resistance; Two ends connect described constant-current source circuit and thermal resistance simulation circuit respectively; Be used to receive the output signal from said constant-current source circuit, and output signal to said thermal resistance simulation circuit, these thermal resistance two ends are parallel with described first differential amplifier circuit;
Said thermal resistance simulation circuit, input end connects said dsp controller, and output head grounding is used for the given resistance value that provides according to dsp controller, simulates corresponding resistance R S, and these thermal resistance simulation circuit two ends are parallel with second differential amplifier circuit;
The output terminal of said first differential amplifier circuit and second differential amplifier circuit links to each other with the input end of said the 3rd differential amplifier circuit respectively.
Preferably, the above-mentioned thermal resistance simulation and calibration system that is used for signal emulation system, described thermal resistance are the PT100 thermal resistance.
Preferably, the above-mentioned thermal resistance simulation and calibration system that is used for signal emulation system, described thermal resistance simulation circuit are the PT100 thermal resistance simulation circuit corresponding with thermal resistance.
Preferably, the voltage that two ends form about the above-mentioned thermal resistance simulation and calibration system that is used for signal emulation system, described thermal resistance is V
2, V
1, first differential amplifier circuit amplifies the voltage on the thermal resistance, output voltage V
A=K (V
2-V
1), K is an enlargement factor, voltage V
ASample and obtain corresponding temperature T by dsp controller.
Preferably, the voltage that two ends form about the above-mentioned thermal resistance simulation and calibration system that is used for signal emulation system, described thermal resistance simulation circuit is V
1, V
0, second differential amplifier circuit amplifies the voltage on the thermal resistance simulation circuit, output voltage V
B=K (V
I-V
O), K is an enlargement factor, the output voltage V of the 3rd differential amplifier circuit
O=V
A-V
B
Preferably, the above-mentioned thermal resistance simulation and calibration system that is used for signal emulation system, described dsp controller are gathered the output signal V of the 3rd differential amplifier circuit
OAfter, obtain corresponding temperature T
Δ, observed temperature is T
O-T
Δ
The present invention has the following advantages: the present invention is because the output voltage V of first differential amplifier circuit and second differential amplifier circuit
A, V
BDifference be what the error of the sum of errors lead-in wire of thermal resistance caused, the 3rd differential amplifier circuit takes out this part error, then through the sample output V of the 3rd differential amplifier circuit of dsp controller
OLater on automatic this part error of compensation correction.The error that causes is measured in calibrating sensors wiring and calculating, improves temperature detecting precision, guarantees the accuracy of signal simulation.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Fig. 1 is an electrical block diagram of the present invention.
Reference numeral among the figure is: 1, dsp controller; 2, constant-current source circuit; 3, thermal resistance; 4, thermal resistance simulation circuit; 5, first differential amplifier circuit; 6, second differential amplifier circuit; 7, the 3rd differential amplifier circuit.
Embodiment
See also Fig. 1; The thermal resistance simulation and calibration system that is used for signal emulation system of the present invention has been shown among the figure; It comprises dsp controller 1, constant-current source circuit 2, thermal resistance 3, thermal resistance simulation circuit 4, first differential amplifier circuit 5, second differential amplifier circuit 6 and the 3rd differential amplifier circuit 7; Thermal resistance 3 is connected with constant-current source circuit 2 with thermal resistance simulation circuit 4; The electric current that both flow through is on all four, and wherein: the output terminal of dsp controller links to each other with the thermal resistance simulation circuit with constant-current source circuit, and input end is connected with the output terminal of first differential amplifier circuit with the 3rd differential amplifier circuit; The constant-current source circuit output terminal is connected with the input end of thermal resistance simulation circuit through thermal resistance; First differential amplifier circuit is connected in parallel on the thermal resistance two ends, and second differential amplifier circuit is connected in parallel on thermal resistance simulation circuit two ends, and first differential amplifier circuit is connected the input end of the 3rd differential amplifier circuit with the output terminal of second differential amplifier circuit.
Constant-current source circuit 2 is obtained electric energy from power Vcc, and according to the given current values that dsp controller 1 provides, produces the corresponding steady current that flows through thermal resistance 3 and thermal resistance simulation circuit 1, and current value is no more than 0.75mA.
The output signal that thermal resistance 3 receives from constant-current source circuit 2, and output signal to thermal resistance simulation circuit 4, these thermal resistance 3 two ends are parallel with first differential amplifier circuit 5, and the thermal resistance voltage that two ends form about in the of 3 is V
2, V
1, first differential amplifier circuit 5 amplifies the voltage on the thermal resistance 3 output voltage V
A=K (V
2-V
1), K is an enlargement factor, voltage V
ASample and obtain corresponding temperature T by dsp controller 1.
Thermal resistance simulation circuit 4 simulates corresponding resistance R according to the given resistance value that dsp controller 1 provides
S, these thermal resistance simulation circuit 4 two ends are parallel with second differential amplifier circuit 6, and the thermal resistance simulation circuit voltage that two ends form about in the of 4 is V
1, V
0, second differential amplifier circuit 6 amplifies the voltage on the thermal resistance simulation circuit 4 output voltage V
B=K (V
I-V
O), K is an enlargement factor.
The input end of the 3rd differential amplifier circuit 7 links to each other the output voltage V of the 3rd differential amplifier circuit with the output terminal of first differential amplifier circuit 5 and second differential amplifier circuit 6 respectively
O=V
A-V
B, because voltage V
A, V
BEnlargement factor be consistent, temperature, resistance conversion table also are consistent, voltage V
A, V
BDifference be the error of the sum of errors lead-in wire of thermal resistance 3.
The given current value of dsp controller 1 output is given constant-current source circuit 2; And export corresponding resistance value according to standard temperature and give thermal resistance simulation circuit 4; This dsp controller 1 is gathered the output signal of first differential amplifier circuit 5 and the 3rd differential amplifier circuit 7 respectively, and dsp controller 1 is gathered the output signal V of the 3rd differential amplifier circuit 7
OAfter, obtain corresponding temperature T
Δ, observed temperature is T
O-T
Δ
In the present embodiment, thermal resistance 3 is the PT100 thermal resistance, and the thermal resistance simulation circuit is the PT100 thermal resistance simulation circuit corresponding with thermal resistance 3.
To illustrate below, for example: constant-current source circuit 2 is made up of FET 3DJ8 and amplifier LM324, and it is DSP2801 that dsp controller 1 adopts model, provides the voltage of 1V, and corresponding constant-current source circuit 2 output currents are 0.5mA, and thermal resistance 3 adopts PT100 resistance.
When 25 ℃ of room temperatures, produced voltage V when flowing through the electric current of 0.5mA on the PT100 resistance
2-V
1=51mV.
First differential amplifier circuit 5 is formed V by LM324
A=K (V
2-V
1), k=20, then V
A=1020mV.DSP2801, sampling and record V
A, and, obtain 25.5 ℃ of corresponding temperature according to the voltage temperature table.
DSP2801 via the PT100 thermal resistance simulation circuit that FET 3DJ8 forms, produces the resistance of 100 Ω with this numerical value according to 25 ℃ of room temperatures, then the voltage V of PT100 thermal resistance simulation circuit generation
I-V
O=50mV.
Second differential amplifier circuit 6 is formed V by LM324
B=K (V
I-V
O), k=20, then V
B=1000mV.
The 3rd differential amplifier circuit 7 is formed V by LM324
O=V
A-V
B=20mV.
DSP2801 samples the difference of 20mV, and corresponding Δ T=0.5 ℃, then survey 25.5 ℃-0.5 ℃=25 ℃, observed temperature is corrected to normal room temperature.
The invention has the beneficial effects as follows: the present invention is because V
A, V
BDifference be what the error of the sum of errors lead-in wire of thermal resistance caused, the 3rd differential amplifier circuit takes out this part error, then through the sample output V of the 3rd differential amplifier circuit of dsp controller
OLater on automatic this part error of compensation correction.The error that causes is measured in calibrating sensors wiring and calculating, improves temperature detecting precision, guarantees the accuracy of signal simulation.
Claims (6)
1. a thermal resistance simulation and calibration system that is used for signal emulation system is characterized in that, comprising:
Dsp controller; Output terminal connects constant-current source circuit and thermal resistance simulation circuit; Input end connects the output terminal of first differential amplifier circuit and the 3rd differential amplifier circuit; Be used to export given current value and give constant-current source circuit, and export corresponding resistance value according to standard temperature and give the thermal resistance simulation circuit, this dsp controller is gathered the output signal of first differential amplifier circuit and the 3rd differential amplifier circuit respectively;
Said constant-current source circuit; Input end connects said dsp controller; Input end connects said thermal resistance simulation circuit through thermal resistance; Said constant-current source circuit is used for obtaining electric energy from power Vcc, and according to the given current values that dsp controller provides, produces the corresponding steady current that flows through thermal resistance and thermal resistance simulation circuit;
Said thermal resistance; Two ends connect described constant-current source circuit and thermal resistance simulation circuit respectively; Be used to receive the output signal from said constant-current source circuit, and output signal to said thermal resistance simulation circuit, these thermal resistance two ends are parallel with described first differential amplifier circuit;
Said thermal resistance simulation circuit, input end connects said dsp controller, and output head grounding is used for the given resistance value that provides according to dsp controller, simulates corresponding resistance R S, and these thermal resistance simulation circuit two ends are parallel with second differential amplifier circuit;
The output terminal of said first differential amplifier circuit and second differential amplifier circuit links to each other with the input end of said the 3rd differential amplifier circuit respectively.
2. the thermal resistance simulation and calibration system that is used for signal emulation system as claimed in claim 1 is characterized in that, described thermal resistance is the PT100 thermal resistance.
3. the thermal resistance simulation and calibration system that is used for signal emulation system as claimed in claim 1 is characterized in that, described thermal resistance simulation circuit is the PT100 thermal resistance simulation circuit corresponding with thermal resistance.
4. the thermal resistance simulation and calibration system that is used for signal emulation system according to claim 1 is characterized in that, the described thermal resistance voltage of two ends formation up and down is V
2, V
1, first differential amplifier circuit amplifies the voltage on the thermal resistance, output voltage V
A=K (V
2-V
1), K is an enlargement factor, voltage V
ASample and obtain corresponding temperature T by dsp controller.
5. according to claim 1 or the 4 described thermal resistance simulation and calibration systems that are used for signal emulation system, it is characterized in that the described thermal resistance simulation circuit voltage of two ends formation up and down is V
1, V
0, second differential amplifier circuit amplifies the voltage on the thermal resistance simulation circuit, output voltage V
B=K (V
I-V
O), K is an enlargement factor, the output voltage V of the 3rd differential amplifier circuit
O=V
A-V
B
6. the thermal resistance simulation and calibration system that is used for signal emulation system according to claim 1 is characterized in that, described dsp controller is gathered the output signal V of the 3rd differential amplifier circuit
OAfter, obtain corresponding temperature T
Δ, observed temperature is T
O-T
Δ
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105555408A CN102478438A (en) | 2010-11-23 | 2010-11-23 | Thermal resistance analog calibration system for signal simulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105555408A CN102478438A (en) | 2010-11-23 | 2010-11-23 | Thermal resistance analog calibration system for signal simulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102478438A true CN102478438A (en) | 2012-05-30 |
Family
ID=46091150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105555408A Pending CN102478438A (en) | 2010-11-23 | 2010-11-23 | Thermal resistance analog calibration system for signal simulation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102478438A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749520A (en) * | 2012-06-19 | 2012-10-24 | 北京康拓科技有限公司 | Multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus |
| CN103674327A (en) * | 2013-12-09 | 2014-03-26 | 张金木 | Automatic thermal resistance temperature calibration instrument |
| CN104458044A (en) * | 2014-12-19 | 2015-03-25 | 浙江比洛德传动技术有限公司 | Sensing device of intelligent fan control device suitable for vehicle cooling system |
| CN105068450A (en) * | 2015-08-25 | 2015-11-18 | 西北工业大学 | Thermal resistance simulation device and method for hardware in loop simulation system |
| CN107144369A (en) * | 2017-06-27 | 2017-09-08 | 深圳库博能源科技有限公司 | A kind of temperature signal emulation mode being used in DCS production debuggings and device |
| CN109443599A (en) * | 2018-11-23 | 2019-03-08 | 沪东重机有限公司 | A kind of marine diesel thermal resistance automatic measurement system and measurement method |
| CN113885390A (en) * | 2021-10-15 | 2022-01-04 | 湖南恩智绿源电子技术有限公司 | Method for ensuring current control precision after parallel connection of power supplies by adopting digital-analog mixing |
-
2010
- 2010-11-23 CN CN2010105555408A patent/CN102478438A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749520A (en) * | 2012-06-19 | 2012-10-24 | 北京康拓科技有限公司 | Multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus |
| CN103674327A (en) * | 2013-12-09 | 2014-03-26 | 张金木 | Automatic thermal resistance temperature calibration instrument |
| CN103674327B (en) * | 2013-12-09 | 2015-12-09 | 张金木 | A kind of Automatic thermal resistance temperature calibration instrument |
| CN104458044A (en) * | 2014-12-19 | 2015-03-25 | 浙江比洛德传动技术有限公司 | Sensing device of intelligent fan control device suitable for vehicle cooling system |
| CN105068450A (en) * | 2015-08-25 | 2015-11-18 | 西北工业大学 | Thermal resistance simulation device and method for hardware in loop simulation system |
| CN105068450B (en) * | 2015-08-25 | 2017-09-26 | 西北工业大学 | Thermal resistance simulation device and method for Hardware-in-the-loop simu- lation system |
| CN107144369A (en) * | 2017-06-27 | 2017-09-08 | 深圳库博能源科技有限公司 | A kind of temperature signal emulation mode being used in DCS production debuggings and device |
| CN107144369B (en) * | 2017-06-27 | 2020-06-05 | 深圳库博能源科技有限公司 | Temperature signal simulation method and device for DCS product debugging |
| CN109443599A (en) * | 2018-11-23 | 2019-03-08 | 沪东重机有限公司 | A kind of marine diesel thermal resistance automatic measurement system and measurement method |
| CN113885390A (en) * | 2021-10-15 | 2022-01-04 | 湖南恩智绿源电子技术有限公司 | Method for ensuring current control precision after parallel connection of power supplies by adopting digital-analog mixing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102478438A (en) | Thermal resistance analog calibration system for signal simulation system | |
| CN204101635U (en) | A kind of microresistivity survey instrument and electronic product process units | |
| CN105806371B (en) | The temperature and pressure dynamic compensation method of sensor | |
| CN101957243A (en) | High-precision temperature measuring device and method | |
| CN207472443U (en) | Multichannel three-wire system resistance temperature measurement circuit | |
| CN102879758A (en) | Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer | |
| CN102288891A (en) | Method for extracting parameters of solar cell | |
| CN202648827U (en) | Temperature measurement circuit, temperature acquisition system, frequency converter and temperature transmitter | |
| CN102478422A (en) | Zero drift simulation calibrating method and device thereof | |
| CN101551423A (en) | Thermal resistance simulation and calibration system for device ageing screening lathe | |
| CN103558571A (en) | Calibration system of electronic transformer and merging unit | |
| CN103592056A (en) | Temperature calibration instrument based on temperature differences | |
| CN111521857B (en) | Multi-conductor current measuring system based on TMR tunnel magnetic resistance | |
| CN205483399U (en) | Calibrating device based on silicon differential pressure pressure sensor | |
| CN105758548A (en) | Temperature measurement circuit of platinum thermal resistor PT100 | |
| CN210346590U (en) | Wireless static strain tester and wireless static strain test system | |
| CN203745081U (en) | Extremely-low-lost adjustable-detection-range light intensity detection circuit | |
| CN201229385Y (en) | Thermal resistor simulating and calibrating equipment for burn-in screen vehicle for component | |
| CN203551762U (en) | Electronic instrument transformer and merging unit verification system | |
| CN206695925U (en) | A kind of multichannel RTD thermal resistance measurement modules | |
| CN201413338Y (en) | Low wind speed measuring sensor | |
| CN111141406B (en) | PT100 temperature measurement system and temperature measurement method | |
| CN204514495U (en) | The temperature measurement circuit of platinum resistance thermometer sensor, PT100 | |
| CN211085507U (en) | Single ADC multichannel temperature monitoring circuit controlled by GPIO | |
| CN102243095A (en) | Zero-drift simulation calibrating system for vibration measurement circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120530 |