CN201716129U - Main board for thermodetector - Google Patents
Main board for thermodetector Download PDFInfo
- Publication number
- CN201716129U CN201716129U CN2010202258975U CN201020225897U CN201716129U CN 201716129 U CN201716129 U CN 201716129U CN 2010202258975 U CN2010202258975 U CN 2010202258975U CN 201020225897 U CN201020225897 U CN 201020225897U CN 201716129 U CN201716129 U CN 201716129U
- Authority
- CN
- China
- Prior art keywords
- circuit
- main board
- thermopair
- way
- selecting side
- 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 - Lifetime
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model relates to a main board for a thermodetector, which comprises a main control circuit including a microprocessor, a dial input circuit, an interface circuit provided with at least two slots and a thermocouple sampling circuit. The main board adopts an A/D conversion circuit to control a circuit structure of the sampling circuit so as to reduce circuit interference between digital and analogue circuits, and a zeroing compensation circuit is added at the front end of the A/D conversion circuit, thereby increasing accuracy of temperature measurement. The main board has the advantages that the main board adopts the bus type interface circuit and is provided with a plurality of interface circuit sockets to expand functions, and the A/D conversion circuit is connected with a control end of the analogue circuit, thereby reducing connection between the digital circuit and the analogue circuit, decreasing interference of the analogue circuit to the digital circuit and increasing work reliability. The main board is added with the zeroing compensation circuit so that reverse biased zero point can be adjusted conveniently, zero crossing point non-linear error is avoided and accuracy of temperature measurement is increased.
Description
Technical field
The utility model belongs to metallurgical furnace thermal technology temperature measuring equipment, particularly a kind of main board for thermometer.
Background technology
Metal smelting liquation temperature measurer is because the measure field working condition is complicated so used temperature measurer must be simple to operate, reliable and stable at present; And present temperature measurer often needs setup parameter, what the setting of its parameter was adopted is row's formula multidigit dial, need open cabinet operates on mainboard, both inconvenience was also dangerous, and the interface circuit of mainboard does not have extended function, along with development of technology need constantly increase function, so the interface circuit on the mainboard should satisfy the needs of expansion.And the thermocouple measurement accuracy correction of present mainboard, also continuing to use traditional mimic channel proofreaies and correct, needing to regulate in the mainboard potentiometer of control circuit in calibration proofreaies and correct, in use because vibration, subtle change can take place in the resistance of potentiometer, because this subtle change has changed correcting potential, and then the measuring accuracy that measuring error influences thermometric occurs.
Summary of the invention
The purpose of this utility model is to propose a kind of main board for thermometer technical scheme, this scheme adopts the serial interface bus mode that a plurality of interface board sockets are set on mainboard, realized that parameter setup key commonly used breaks away from mainboard, the dial of the parameter setting that need on mainboard, operate, employing is revolved yard dial and replaced row's formula multidigit dial, and is simple to operate, is connected with the control end of mimic channel with the A/D change-over circuit, with the isolation of digital circuit and mimic channel, reduced the interference of mimic channel to digital circuit.
For achieving the above object, the technical solution of the utility model is: a kind of main board for thermometer, comprise the governor circuit and the peripheral circuit that contain microprocessor, described peripheral circuit comprises the dial-up input circuit and has interface circuit, the thermopair sample circuit of two slots at least; Described thermopair sample circuit comprises Temperature Measure Control circuit, A/D change-over circuit and school zero-compensation circuit;
Described Temperature Measure Control circuit comprises two-way multi-position switch and reference power supply, and wherein reference power supply provides the standard correction full scale current potential and the zero potential of thermopair; Described two-way multi-position switch is that two-way four selects a non-contact switch circuit, wherein the selecting side X of a way switch connects the thermopair input, another selecting side, road Y is connected to the A/D change-over circuit through amplifier, have at least the active pull-up of leading up to dividing potential drop to insert a current potential in the four tunnel selected ends of selecting side X, the four tunnel selected ends of selecting side Y wherein one the tunnel connect reference power supply, and the four tunnel selected ends of selecting side Y wherein another road connect the thermopair input;
Described school zero-compensation circuit comprises a multidigit selector switch and voltage divider, described multidigit selector switch is that two-way four selects a non-contact switch circuit, two-way four selects a road of a non-contact switch circuit to select the reference potential input end of the described amplifier of termination, and the selected then end of the multidigit of one tunnel selecting side connects the different partial pressure potential of voltage divider respectively.
Described interface circuit is a serial bus interface circuit.
Described voltage divider is to be connected to form with power supply by a plurality of resistance series connection back.
To be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described thermopair standard correction full scale current potential.
The control end of the multidigit selector switch in the two-way multi-position switch in the described Temperature Measure Control circuit and the described school zero-compensation circuit is connected with the control of A/D change-over circuit output.
Described dial-up input circuit is to revolve code-disc dial-up input circuit.
Described slot is the two-sided straight cutting grooves of 26 lines.
The beneficial effects of the utility model are:
1. the utility model adopts the bus type interface circuit, is provided with a plurality of interface circuit sockets and has realized the extendible of function;
2. the utility model adopts the A/D change-over circuit to be connected with the control end of mimic channel, with digital circuit and mimic channel isolation minimizing interference of mimic channel to digital circuit;
3. the utility model has added school zero-compensation circuit and makes and can adjust very easily when bearing partially zero point;
4. the utility model is simple in structure, and is easy to operate.
Below in conjunction with drawings and Examples the utility model being done one describes in detail.
Description of drawings
Fig. 1 is the utility model logic diagram of circuit;
Fig. 2 is the utility model Temperature Measure Control and school zero-compensation circuit diagram.
Embodiment
Embodiment 1:
A kind of main board for thermometer embodiment, referring to Fig. 1 and Fig. 2, described mainboard comprises governor circuit 1 and the peripheral circuit that contains microprocessor, described peripheral circuit comprises dial-up input circuit 2 and has interface circuit, the thermopair sample circuit 4 of two slots 3 at least; Described thermopair sample circuit comprises Temperature Measure Control circuit 4-1, A/D change-over circuit 4-2 and school zero-compensation circuit 4-3; Described slot is the two-sided straight cutting grooves of 26 lines, and present embodiment is three the 26 two-sided straight cutting grooves of line.
Described Temperature Measure Control circuit comprises two-way multi-position switch 4-1-1 and reference power supply 4-1-2, and wherein reference power supply provides the standard correction full scale current potential and the zero potential of thermopair; Described two-way multi-position switch is that two-way four selects a non-contact switch circuit, wherein the selecting side X of a way switch connects the thermopair input, another selecting side, road Y is connected to the A/D change-over circuit through amplifier 4-4, have at least the active pull-up of leading up to dividing potential drop to insert a current potential (being connected the power supply dividing potential drop after passing through resistance R 1 among the embodiment and R1 connecting) in the four tunnel selected ends of selecting side X, the four tunnel selected ends of selecting side Y wherein one the tunnel connect reference power supply, and the four tunnel selected ends of selecting side Y wherein connect thermopair 7 in another road;
Described school zero-compensation circuit comprises a multidigit selector switch 4-3-1 and voltage divider 4-3-2, described multidigit selector switch is that two-way four selects a non-contact switch circuit, two-way four select a road of a non-contact switch circuit to select the reference potential input end of the described amplifier of termination, the selected then end of the multichannel of one tunnel selecting side connects the partial pressure potential of voltage divider respectively, described voltage divider is that to be connected to form with power supply by the series connection of a plurality of resistance (be by R3 R4 among the embodiment, the R5 series connection connects to form with power supply), adopt school zero-compensation circuit, when the inclined to one side negative value of current potential at zero point, by the reference potential that changes amplifier make its zero point drift on the occasion of, carry out digital school zero by program then, solved when zero point, current potential was negative value, though can the school zero by numeral, but when measuring, can produce the zero crossing nonlinearity erron during current potential, with zero deviation be modulated on the occasion of, make its measured value be in linearity all the time, reduced measuring error.
What microprocessor was selected for use described in the embodiment is ATMEGA162 eight bit microprocessors, what the A/D converter of described A/D change-over circuit was selected for use is 18 A/D converters of MAX132, and what described two-way multi-position switch and multidigit selector switch were selected for use is that 4052 two-ways four select a noncontacting switch.
Described interface circuit is a serial bus interface circuit, and it is to be driven by the bus driver 5 that connects microprocessor, and the model that present embodiment adopts is SN75452B.
Described dial-up input circuit is to revolve code-disc 6 dial-up input circuits, and code-disc is revolved in six of present embodiment employings and 74LS165 has formed the dial-up input circuit.
To be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described thermopair standard correction full scale current potential.
The control end of the multidigit selector switch in the two-way multidigit selector switch in the described Temperature Measure Control circuit and the described school zero-compensation circuit is connected with the control of A/D change-over circuit output, 18 A/D converters of MAX132 have four control outputs among the embodiment, per two with four control outputs connect two multidigit selector switch respectively, therefore artificial circuit part does not have data line in wiring board, and data line only is connected to A/D converter, reduce the phase mutual interference of digital-to-analogue, improved the stability and the reliability of measuring process.
Claims (7)
1. a main board for thermometer comprises the governor circuit and the peripheral circuit that contain microprocessor, it is characterized in that, described peripheral circuit comprises the dial-up input circuit and has interface circuit, the thermopair sample circuit of two slots at least; Described thermopair sample circuit comprises Temperature Measure Control circuit, A/D change-over circuit and school zero-compensation circuit; Described Temperature Measure Control circuit comprises two-way multi-position switch and reference power supply, and wherein reference power supply provides the standard correction full scale current potential and the zero potential of thermopair; Described two-way multi-position switch is that two-way four selects a non-contact switch circuit, wherein the selecting side X of a way switch connects the thermopair input, another selecting side, road Y is connected to the A/D change-over circuit through amplifier, have at least the active pull-up of leading up to dividing potential drop to insert a current potential in the four tunnel selected ends of selecting side X, the four tunnel selected ends of selecting side Y wherein one the tunnel connect reference power supply, and the four tunnel selected ends of selecting side Y wherein another road connect the thermopair input; Described school zero-compensation circuit comprises a multidigit selector switch and voltage divider, described multidigit selector switch is that two-way four selects a non-contact switch circuit, two-way four selects a road of a non-contact switch circuit to select the reference potential input end of the described amplifier of termination, and the selected then end of the multidigit of one tunnel selecting side connects the different partial pressure potential of voltage divider respectively.
2. a kind of main board for thermometer according to claim 1 is characterized in that described interface circuit is a serial bus interface circuit.
3. a kind of main board for thermometer according to claim 1 is characterized in that, described voltage divider is to be connected to form with power supply by a plurality of resistance series connection back.
4. a kind of main board for thermometer according to claim 1 is characterized in that, to be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to the standard correction full scale current potential of described thermopair.
5. a kind of main board for thermometer according to claim 1 is characterized in that, the control end of the multidigit selector switch in the two-way multi-position switch in the described Temperature Measure Control circuit and the described school zero-compensation circuit is connected with the control of A/D change-over circuit output.
6. a kind of main board for thermometer according to claim 1 is characterized in that, described dial-up input circuit is to revolve code-disc dial-up input circuit.
7. a kind of main board for thermometer according to claim 1 is characterized in that, described slot is the two-sided straight cutting grooves of 26 lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202258975U CN201716129U (en) | 2010-06-13 | 2010-06-13 | Main board for thermodetector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202258975U CN201716129U (en) | 2010-06-13 | 2010-06-13 | Main board for thermodetector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201716129U true CN201716129U (en) | 2011-01-19 |
Family
ID=43462133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202258975U Expired - Lifetime CN201716129U (en) | 2010-06-13 | 2010-06-13 | Main board for thermodetector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201716129U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846558A (en) * | 2010-06-13 | 2010-09-29 | 北京市科海龙华工业自动化仪器有限公司 | Main board for thermometer and thermocouple precision correcting method |
-
2010
- 2010-06-13 CN CN2010202258975U patent/CN201716129U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846558A (en) * | 2010-06-13 | 2010-09-29 | 北京市科海龙华工业自动化仪器有限公司 | Main board for thermometer and thermocouple precision correcting method |
| CN101846558B (en) * | 2010-06-13 | 2011-12-14 | 北京市科海龙华工业自动化仪器有限公司 | Main board for thermometer and thermocouple precision correcting method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102589743A (en) | Digital display temperature detection system and digital display temperature detection method | |
| CN204064410U (en) | A kind of electronic scales based on resistance strain gage | |
| CN204886925U (en) | Full sign indicating number test module of digital analog converter and full sign indicating number test system of digital analog converter | |
| CN103185645B (en) | High-precision temperature detecting device and detecting method applied to draught fan control system | |
| CN101846558B (en) | Main board for thermometer and thermocouple precision correcting method | |
| CN104634499A (en) | Intelligent pressure transmitter | |
| CN201716129U (en) | Main board for thermodetector | |
| CN102866180B (en) | High-precision intelligent acidity meter and measuring method thereof | |
| CN104316892A (en) | Transformer load box calibration device | |
| CN102661814B (en) | Realizing method of thermocouple temperature transmitter | |
| CN203881815U (en) | Simple high-precision DC electronic load | |
| CN201892582U (en) | Compound continuous molten metal temperature measurement system | |
| CN204515006U (en) | A kind of eight railway digital System of voltage acquisitions | |
| CN101532887A (en) | Wireless temperature measurement gun for metal solution and working method thereof | |
| CN204241127U (en) | A kind of temperature compensation by thermistor circuit based on index | |
| CN201852646U (en) | Instrument for improving thermoregulation accuracy of electric iron temperature controller | |
| CN103616086B (en) | Thermal resistance temperature transmitter | |
| CN204926765U (en) | Automatic regulating electrical resistance's digital regulation resistance | |
| CN201035743Y (en) | Humiture transducer | |
| CN102638267B (en) | System for increasing resolution ratio of A/D (Analog-to-Digital) converter inside AVR (Automatic Voltage Regulator) series single chip microcomputer | |
| CN203672963U (en) | Digital voltmeter based on singlechip | |
| CN204988565U (en) | Capacitanc pressure transmitter | |
| CN206594285U (en) | three phase harmonic standard electric energy meter | |
| CN202614406U (en) | Thermocouple temperature transmitter | |
| CN207556704U (en) | A kind of temperature sensor circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110119 Effective date of abandoning: 20111214 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20110119 Effective date of abandoning: 20111214 |