CN105159349B - A kind of temperature change analogue means and method - Google Patents
A kind of temperature change analogue means and method Download PDFInfo
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- CN105159349B CN105159349B CN201510364763.9A CN201510364763A CN105159349B CN 105159349 B CN105159349 B CN 105159349B CN 201510364763 A CN201510364763 A CN 201510364763A CN 105159349 B CN105159349 B CN 105159349B
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Abstract
The invention discloses a kind of temperature change analogue means and method, temperature value output, correction factor and check value that host computer or control system are issued are received by communication module, according to resistance phasing meter, the characteristics of combination temperature acquisition system, the digital voltage value that module calculates analog temperature correspondence output is resolved by temperature, the magnitude of voltage of resolving is sent to high-precision reference voltage output module by spi bus, corresponding analog voltage is exported by high precision reference voltage output module.Which is applied to conventional field of temperature measurement, can be accurately by temperature simulation into corresponding analog voltage, the temperature value that connection temperature measurement system is measured can be as accurate as 0.5 DEG C, and easy to operate, automaticity is high, small volume, it is easy to multichannel extension, high resolution, precision is high, with temperature correction debugging functions.
Description
Technical field
The invention belongs to electronic technology field, and in particular to a kind of temperature change analogue means and method.
Background technology
Temperature measurement circuit more common at present has two kinds：Bridge-type temperature measurement circuit and constant-current source type temperature measurement circuit, bridge-type thermometric electricity
The principle on road is adoption rate resistance and temperature detecting resistance structure measuring bridge, and the different electricity of output are varied with temperature according to temperature detecting resistance
Resistance, forms pressure difference signal, and the corresponding temperature value of measurement is calculated by gathering pressure difference；The principle of constant-current source type temperature measurement circuit is by perseverance
Electric current is determined by temperature detecting resistance, is varied with temperature the different resistance of output according to temperature detecting resistance, different voltage drops is generated, by right
Voltage drop acquisition process obtains corresponding temperature value.
The method that combined resistance is generally used for temperature simulation, common are following several：(1) relay switching is used
Precision resistance obtains variable resistance.Because relay has contact resistance and volume is larger, not only precision is difficult to ensure that, and
And be unfavorable for extending multichannel application；(2) potentiometer resistance is changed using artificial multi-turn rotation potentiometer.It is many by manual rotation
Circle potentiometer is difficult to realize resistance position and is accurately positioned, and simulation application every time, all needs to re-start measurement and positioning, operation is multiple
It is miscellaneous；(3) switch semiconductor resistor using single or multiple digital regulation resistances to obtain variable resistance, but current numeral electricity
The resolution ratio of position device is not high, specified resistance error is big, temperature coefficient is big, and can not step-less adjustment.
The A of Chinese patent CN 103868200 disclose a kind of level voltage output device changed for analog temperature, bag
Include main control module, temperature setting module, data memory module, current potential generation module and display module, by main control module according to
The temperature setting of temperature setting module output is instructed reads one or more target potential data from data memory module, and by
Current potential generation module is according to one or more one or more level voltages of target potential data output, if current potential generation module
The level voltage of output level voltage corresponding with target potential data is inconsistent, then main control module can correspondingly be adjusted and is sent to
The potential data of current potential generation module, until the level voltage level corresponding with target potential data that current potential generation module is exported
Voltage is consistent, it is achieved thereby that setting instruction simulation temperature change according to temperature and exporting corresponding level voltage.The device
Air conditioner is mainly used in, the setting instruction of its temperature is usually to send what control operation reached to temperature setting module by user,
And the level voltage of its output is obtained by the target potential data directly read from data memory module, main control module
Can only constantly adjust makes current potential generation module output potential data be consistent with target potential data, the correcting mode and air-conditioning
The temperature sampling module of device is not in contact with, it is impossible to according to the temperature value of temperature sampling module actual acquisition come to analog voltage
Modify, it is impossible to ensure its accuracy.
The content of the invention
, can be accurately by temperature simulation into corresponding simulation it is an object of the invention to provide a kind of temperature change analogue means
Voltage, while providing a kind of temperature simulation method using the device.
In order to realize the above object the technical solution adopted in the present invention is：A kind of temperature change analogue means, including it is logical
Believe that module, temperature resolve module, Logic control module, reference voltage output module, parameter memory module；
Communication module, for receiving output temperature value, correction factor and check value that host computer or control system are issued
Order, and the order of reception is passed into temperature resolving module；
Temperature resolves module, and corresponding digital voltage value is drawn for output temperature value to be resolved；
Logic control module, enable control and the reference voltage output module of bid value are received for realizing to communication module
Enable control, and the digital voltage value of resolving is sent to reference voltage output module；Correction factor is stored in parameter simultaneously
Memory module, and when from when temperature value is with wanting analog temperature to there is deviation obtained by temperature measurement system, carry out temperature adjustmemt, modification
Correction factor is simultaneously stored；
Reference voltage output module, is adopted for being converted to corresponding analog voltage and exporting to temperature digital voltage value
Collecting system；
Parameter memory module, for storing correction factor.
The reference voltage module includes D/A modular converters and voltage conditioning module.
The communication module is RS485 communication modules.
The Logic control module uses STM32F103 family chips.
The step of a kind of temperature change analogy method, this method, is as follows：
(1) temperature output temperature bid value, the correction value that host computer or control system are sent are received by communication module
And check value；
(2) temperature resolves module by bid value analytical Calculation, obtains the corresponding digital voltage value of temperature；
(3) digital voltage value of resolving is passed to reference voltage output module by Logic control module, by D/A conversion and
Voltage is nursed one's health, and exports corresponding analog voltage；
(4) after the corresponding analog voltage of output is gathered by temperature measurement system, the temperature that will be obtained from temperature measurement system
Value is compared with the temperature value to be simulated, if unanimously, correction factor is 0；Otherwise offset temperature is modified, is by amendment
Number deposit parameter memory module.
Specific Modbus communication protocols are observed between communication module and the host computer communicated with or control system.
The process that bid value analytical Calculation is obtained the corresponding digital voltage value of temperature by temperature resolving module is as follows：
I looks into matrix table and obtains wanting the corresponding resistance value of analog temperature, and the matrix table is according to a constant temperature resistance phasing meter
The matrix table for the corresponding array that the resistance value of design temperature scope is fabricated to by degree interval；
What II was obtained according to tabling look-up wants the corresponding resistance value of analog temperature to calculate corresponding digital voltage value.
Logic control module will resolve digital voltage value and pass to reference voltage output module by spi bus.
The temperature change analogue means and method of the present invention is issued by communication module reception host computer or control system
The characteristics of temperature value output, correction factor and check value, foundation resistance phasing meter, combination temperature acquisition system, pass through temperature solution
The digital voltage value that module calculates analog temperature correspondence output is calculated, is sent the magnitude of voltage of resolving to high-precision by spi bus
Reference voltage output module is spent, corresponding analog voltage is exported by high precision reference voltage output module.Which is applied to
Conventional field of temperature measurement, can be accurately by temperature simulation into corresponding analog voltage, and connection temperature measurement system is measured
Temperature value can be as accurate as 0.5 DEG C, and easy to operate, solve artificial multi-turn rotation potentiometer multiple to change potentiometer resistance
Operation setting problem；Automaticity is high, small volume, it is easy to which multichannel extends, and solves relay switching precision resistance and obtains variable
Resistance volume it is big the problem of；High resolution, precision is high, with temperature correction debugging functions, solves because of digital regulation resistance certainly
Precision caused by body feature is low, it is impossible to the problem of realizing step-less adjustment.
The device is also easy to extension according to the demand of temperature simulation port number, by by apparatus module and Modbus agreements
It is modified slightly, you can meet and simulate a variety of environment temperatures simultaneously, be widely used.
Brief description of the drawings
Fig. 1 is the schematic diagram of temperature change analogue means of the present invention；
Fig. 2 is RS485 module Principle of Communication figures；
Fig. 3 is the implementation process that temperature resolves module；
Fig. 4 is the Modbus agreements for receiving heat command.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described further specific embodiment.
It is the schematic diagram of temperature change analogue means of the present invention as shown in Figure 1, as seen from the figure, the device includes communication mould
Block, temperature resolve module, Logic control module, reference voltage output module, parameter memory module；Communication module, for receiving
Output temperature value, correction factor and check value order that host computer or control system are issued, and the order of reception is passed to
Temperature resolves module；Temperature resolves module, and corresponding digital voltage value is drawn for output temperature value to be resolved；Logic control mould
Block, the enable control of bid value and the enable control of reference voltage output module are received for realizing to communication module, and will solution
The digital voltage value of calculation is sent to reference voltage output module；Correction factor is stored in parameter memory module simultaneously, and worked as from temperature
Temperature value obtained by degree measuring system and when want the analog temperature to there is deviation, carries out temperature adjustmemt, modification correction factor is simultaneously stored；Ginseng
Voltage output module is examined, for digital voltage value to be converted into corresponding analog voltage and exported to temperature acquisition system；Ginseng
Number memory module, for storing correction factor.
As shown in Fig. 2 the communication module of the present embodiment is RS485 communication modules, communication core is used as from ISO3082DW
Piece, U2RX, U2TX, U2CS connection temperature resolves module, RS485_A, RS485_B connection host computer or control system, wherein
R1, R2, TVS1, TVS2 are protective resistance and diode.U2CS module controls controlled by logic, when enabled, RS485 communication moulds
Block can be communicated with host computer or control system.
Temperature resolves module by realizing that the software algorithm that temperature value is changed to digital voltage value is constituted, and it can be according to different
Temperature acquisition system changes corresponding algorithm.
Logic control module uses the STM32F103 family chips of ST companies, can select STM32F103R8T6 chips,
It has 2 road SPI communication interfaces, much 49 GPIO mouthfuls, it is easy to logic control and expanded application.
Reference voltage output module is made up of D/A modular converters and voltage conditioning module.
Parameter memory module selects eeprom chip AT25128N-10SI-2.7, and it has 128K memory capacity.
The temperature change analogue means of the present invention is issued by RS485 communication modules reception host computer or control system
Output temperature value, correction factor and check value order, pass to temperature resolving module by the order of reception and carry out calculating correspondence
Digital voltage value, while correction factor is stored in into parameter memory module, Logic control module control will be resolved by spi bus
Digital voltage value is sent to reference voltage output module, and corresponding analog voltage is exported by D/A conversions and voltage conditioning module
Value, while revised coefficient is stored in into parameter memory module.
It is as follows the step of this method present invention also offers a kind of temperature change analogy method：
(1) temperature output temperature bid value, the correction value that host computer or control system are sent are received by communication module
And check value；Specific Modbus communication protocols are observed between communication module and the host computer communicated with or control system
View.
(2) temperature resolves module according to Modbus communication protocols and data definition by bid value analytical Calculation, obtains temperature
Corresponding digital voltage value；
The Modbus agreements of the present embodiment are as shown in figure 4, initial address is 0000H, and register number is 1,2 words
Section, the height combination of bytes of data is into analog temperature value is wanted, and correction factor can positive and negative and check bit AA55.
As shown in figure 3, when receive want analog temperature when, be modeled to the algorithm steps of corresponding digital quantity voltage
It is as follows：
I looks into matrix table and obtains wanting the corresponding resistance value of analog temperature, and the matrix table is according to a constant temperature resistance phasing meter
The matrix table for the corresponding array that the resistance value of design temperature scope is fabricated to by degree interval；The matrix table of the present embodiment can be by
PT100 RTDs phasing meter is fabricated to 30*10 matrix table according to the 1 DEG C of resistance value by -80 DEG C of -200 DEG C of scopes in interval, and it is counted
Calculation machine lookup table mode is：
M_RValue=TRtable [InputTemp-MIN_TEMP+TEMP_Corn], wherein TRtable are symbol of tabling look-up
Number, InputTemp is input analog temperature, and MIN_TEMP is minimum temperature, i.e. the lowest temperature angle value of matrix table, TEMP_Corn
To want correction factor, 0 is defaulted as.
What II was obtained according to tabling look-up wants the corresponding resistance value of analog temperature to calculate corresponding digital voltage value DAC_Out_
Vol, its calculation formula is as follows：
DAC_Out_Vol=R3/R4*M_Ratio* (m_RValue-R4)
Wherein, m_RValue is the corresponding resistance value of gained analog temperature of tabling look-up；R3/R4 is in reference voltage output module
Voltage conditioning module proportionality coefficient, R3, R4 are the resistance in voltage conditioning module, the temperature of analog electrical output pressure side connection
What measuring system was measured is the voltage at R4 two ends；M_Ratio is adjustable proportion value, when the temperature measurement system of connection is different
It can be adjusted.
(3) digital voltage value of resolving is passed to reference voltage output module by Logic control module by spi bus, warp
D/A conversions and voltage conditioning are crossed, corresponding analog voltage is exported；
Reference voltage output module mainly includes D/A modular converters and voltage conditioning module, and D/A modular converters select 12
DAC7652, when selecting internal reference source, its output voltage valuesWherein n=12, DINFor 0-4093, foundation
The difference of analog temperature value, the different D of correspondence inputINValue, the output voltage of D/A modular converters will change accordingly.Voltage
Conditioning module is that the output voltage of D/A modular converters is carried out into proportion divider, can be selected according to the difference of Research on Automatic Measuring System of Temperature
Different ratios.
(4) after the corresponding analog voltage of output is gathered by temperature measurement system, the temperature that will be obtained from temperature measurement system
Value is compared with the temperature value to be simulated, if unanimously, correction factor is 0；If display there is deviation in both, to offset temperature
It is modified, changes the heat command correction factor that issues, until both temperature deviations is below 0.5 DEG C, and by correction factor
It is stored in parameter memory module.
It should be noted that：The temperature change analogue means of the present invention can be with according to the demand of analog temperature port number
It is extended application.
Above example is only used for the core concept for helping to understand the present invention, it is impossible to the present invention is limited with this, for ability
The technical staff in domain, every thought according to the present invention is modified or equivalent substitution to the present invention, in embodiment
And any change done in application, it should be included in the scope of the protection.
Claims (8)
1. a kind of temperature change analogue means, it is characterised in that：Including communication module, temperature resolve module, Logic control module,
Reference voltage output module, parameter memory module；
Communication module, for receiving output temperature value, correction factor and check value order that host computer or control system are issued,
And the output temperature value of reception, correction factor and check value order are passed into temperature resolving module；
Temperature resolves module, and corresponding digital voltage value is drawn for output temperature value to be resolved；
Logic control module, is controlled communication module output temperature value, correction factor and the enable of check value order for realizing
Controlled with the enable of reference voltage output module, and the digital voltage value of resolving is sent to reference voltage output module；Simultaneously
Correction factor is stored in parameter memory module, and when under temperature value and host computer or control system obtained by temperature acquisition system
When the output temperature value of hair has deviation, temperature adjustmemt is carried out, correction factor is changed and stores；
Reference voltage output module, for digital voltage value to be converted into corresponding analog voltage and exported to temperature acquisition system
System；
Parameter memory module, for storing correction factor.
2. temperature change analogue means according to claim 1, it is characterised in that：The reference voltage output module includes
D/A modular converters and voltage conditioning module.
3. temperature change analogue means according to claim 1 or 2, it is characterised in that：The communication module is logical for RS485
Believe module.
4. temperature change analogue means according to claim 1, it is characterised in that：The Logic control module is used
STM32F103 family chips.
5. a kind of temperature change analogy method, it is characterised in that as follows the step of this method：
(1) output temperature bid value, correction factor and the verification that host computer or control system are sent are received by communication module
Value；
(2) temperature resolves module by output temperature bid value analytical Calculation, obtains the corresponding digital voltage value of temperature；
(3) digital voltage value of resolving is passed to reference voltage output module by Logic control module, by D/A conversions and voltage
Conditioning, exports corresponding analog voltage；
(4) after the corresponding analog voltage of output is gathered by temperature measurement system, by the temperature value obtained from temperature measurement system and
Output temperature bid value is compared, if unanimously, correction factor is 0；Otherwise offset temperature is modified, correction factor is deposited
Enter parameter memory module.
6. temperature change analogy method according to claim 5, it is characterised in that：Communication module and communicate with it is upper
Specific Modbus communication protocols, described Modbus communication protocols are observed between machine or control system, initial address is
0000H, register number is 1,2 bytes, the height combination of bytes of data into host computer or control system issue it is defeated
Go out temperature value, correction factor can positive and negative and check bit AA55.
7. temperature change analogy method according to claim 5, it is characterised in that：Temperature resolves module and orders output temperature
Make value analytical Calculation obtain the corresponding digital voltage value of temperature process it is as follows：
I looks into matrix table and obtains the corresponding resistance value of output temperature bid value, and the matrix table is according to a constant temperature resistance phasing meter
The matrix table for the corresponding array that the resistance value of design temperature scope is fabricated to by degree interval；
The corresponding resistance value of output temperature bid value that II is obtained according to tabling look-up calculates corresponding digital voltage value.
8. the temperature change analogy method according to claim 5~7 any one, it is characterised in that：Logic control module
The digital voltage value of resolving is passed into reference voltage output module by spi bus.
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| CN108414816B (en) * | 2018-01-31 | 2020-08-11 | 许继集团有限公司 | Method and device for resolving alternating current single-phase voltage |
| CN108931954B (en) * | 2018-08-28 | 2024-07-05 | 康泰医学系统（秦皇岛）股份有限公司 | Body temperature signal analog output device |
| CN111221371A (en) * | 2020-01-03 | 2020-06-02 | 深圳市汇川技术股份有限公司 | Analog voltage output method, system, device, and computer-readable storage medium |
| CN115330000B (en) * | 2022-08-31 | 2023-05-02 | 陕西和利安控智能科技有限公司 | Intelligent monitoring management system for operation of industrial automation control instrument |
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| JPH0686540A (en) * | 1992-09-01 | 1994-03-25 | Fujitsu Ltd | Microcomputer controlled stabilized power supply circuit |
| CN202853916U (en) * | 2012-10-16 | 2013-04-03 | 青岛海信日立空调系统有限公司 | Temperature sensor simulation apparatus |
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| CN104345643A (en) * | 2013-07-29 | 2015-02-11 | 珠海格力电器股份有限公司 | temperature simulation circuit and method |
| CN204759232U (en) * | 2015-06-28 | 2015-11-11 | 国家电网公司 | Temperature variation analogue means |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101760816B1 (en) * | 2010-10-28 | 2017-07-25 | 삼성전자주식회사 | Temperature sensor, device including the same, and image sensing system |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0686540A (en) * | 1992-09-01 | 1994-03-25 | Fujitsu Ltd | Microcomputer controlled stabilized power supply circuit |
| CN202853916U (en) * | 2012-10-16 | 2013-04-03 | 青岛海信日立空调系统有限公司 | Temperature sensor simulation apparatus |
| CN103309345A (en) * | 2013-04-12 | 2013-09-18 | 江苏浩峰汽车附件有限公司 | Device and method for simulating temperature variation of Pt100 thermal resistor |
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