CN202974486U - Thermocouple and thermal resistor hybrid accessed measuring circuit - Google Patents
Thermocouple and thermal resistor hybrid accessed measuring circuit Download PDFInfo
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- CN202974486U CN202974486U CN 201220746576 CN201220746576U CN202974486U CN 202974486 U CN202974486 U CN 202974486U CN 201220746576 CN201220746576 CN 201220746576 CN 201220746576 U CN201220746576 U CN 201220746576U CN 202974486 U CN202974486 U CN 202974486U
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- resistance
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- thermopair
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Abstract
The utility model discloses a thermocouple and thermal resistor hybrid accessed measuring circuit, which comprises at least two thermal resistor access terminals, at least two thermocouple access terminals, a filtering circuit, a multiplexer, a voltage offset circuit, a current source circuit, a cold junction compensation circuit, an operational amplifier and an analog-digital converter, wherein the thermal resistor access terminals and the thermocouple access terminals are connected with an input of the multiplexer through the filtering circuit; the voltage offset circuit and the current source circuit are connected with a control end of the multiplexer; the cold junction compensation circuit is integrated in the multiplexer for measuring the temperature of a thermocouple and a thermal resistor; and an output end of the multiplexer is connected with the analog-digital converter through the operational amplifier. The thermocouple and thermal resistor hybrid accessed measuring circuit reduces the circuit complexity, and supports the thermocouple and thermal resistor hybrid access; and compared with similar products, the measuring circuit has the advantages of convenient application, flexible configuration, reliable performance, and the like.
Description
Technical field
The utility model relates to the metering circuit of thermopair, thermal resistance.
Background technology
At industrial control field, relate to temperature survey adopts thermopair and thermal resistance as temperature probe more, because the material composition of thermopair and thermal resistance is different, cause measuring principle different, therefore need two kinds of different metering circuits, this has caused needs to use special-purpose thermocouple measurement module and thermal resistance measurement module in the commercial Application.
The utility model content
The purpose of this utility model is to provide a kind of thermopair and thermal resistance to mix the access metering circuit, and it can solve the thermocouple measurement module that needs the difference configure dedicated, the problem of thermal resistance measurement module.
In order to achieve the above object, the technical scheme that adopts of the utility model is as follows:
A kind of thermopair and thermal resistance mix the access metering circuit, it comprises at least two thermal resistance incoming ends, at least two thermopair incoming ends, filtering circuit, multiplexer, voltage offset electric circuit, current source circuit, cold junction compensation circuit, operational amplifier and analog to digital converters, and thermal resistance incoming end, thermopair incoming end all are connected with the input end of multiplexer by filtering circuit; Bias voltage circuit, current source circuit all are connected with the control end of multiplexer; The cold junction compensation circuit is integrated on multiplexer, is used for measuring the temperature of thermal resistance and thermopair; The output terminal of multiplexer is connected with analog to digital converter by operational amplifier.
Preferably, described filtering circuit comprises the first resistance, the second resistance, the first filter capacitor, the second filter capacitor, the 3rd filter capacitor, the 3rd resistance, the 4th resistance, the 4th filter capacitor, the 5th filter capacitor and the 6th filter capacitor; One end of the first resistance, an end of the second resistance are all as the thermal resistance incoming end, the other end of the first resistance is connected with the input end of multiplexer, an end of the first filter capacitor respectively, the other end of the second resistance is connected with the input end of multiplexer, an end of the second filter capacitor respectively, and the two ends of the 3rd filter capacitor are connected with the other end of the first resistance, the other end of the second resistance respectively; One end of the 3rd resistance, an end of the 4th resistance are all as the thermopair incoming end, the other end of the 3rd resistance is connected with the input end of multiplexer, an end of the 4th filter capacitor respectively, the other end of the 4th resistance is connected with the input end of multiplexer, an end of the 5th filter capacitor respectively, and the two ends of the 6th filter capacitor are connected with the other end of the 3rd resistance, the other end of the 4th resistance respectively; The equal ground connection of the other end of the other end of the other end of the other end of the first filter capacitor, the second filter capacitor, the 4th filter capacitor, the 5th filter capacitor.
The utlity model has following beneficial effect:
Reduce the complicacy of circuit, supported simultaneously the mixing access of thermopair and thermal resistance, compared with similar products, had the advantages such as easy to use, flexible configuration, dependable performance.
Description of drawings
Fig. 1 is that thermopair and the thermal resistance of the utility model preferred embodiment mixes the schematic diagram of access metering circuit;
Fig. 2 is the structural representation of the filtering circuit in Fig. 1.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the utility model is described further:
As depicted in figs. 1 and 2, a kind of thermopair and thermal resistance mix the access metering circuit, and it comprises thermal resistance incoming end 1, thermal resistance incoming end 2, thermopair incoming end 3, thermopair incoming end 4, filtering circuit, multiplexer, voltage offset electric circuit, current source circuit, cold junction compensation circuit, operational amplifier and analog to digital converter.
Thermal resistance incoming end 1, thermal resistance incoming end 2, thermopair incoming end 3, thermopair incoming end 4 all are connected with the input end of multiplexer by filtering circuit.Bias voltage circuit, current source circuit all are connected with the control end of multiplexer; The cold junction compensation circuit is integrated on multiplexer, is used for measuring the temperature of thermal resistance and thermopair; The output terminal of multiplexer is connected with analog to digital converter by operational amplifier.
Wherein, described filtering circuit comprises the first resistance R 1, the second resistance R 2, the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3, the 3rd resistance R 3, the 4th resistance R 4, the 4th filter capacitor C4, the 5th filter capacitor C5 and the 6th filter capacitor C6.
One end of one end of the first resistance R 1, the second resistance R 2 is respectively as thermal resistance incoming end 1, thermal resistance incoming end 2, the other end of the first resistance R 1 is connected with the input end of multiplexer, the end of the first filter capacitor C1 respectively, the other end of the second resistance R 2 is connected with the input end of multiplexer, the end of the second filter capacitor C2 respectively, and the two ends of the 3rd filter capacitor C3 are connected with the other end of the first resistance R 1, the other end of the second resistance R 2 respectively.
One end of one end of the 3rd resistance R 3, the 4th resistance R 4 is respectively as thermopair incoming end 3, thermopair incoming end 4, the other end of the 3rd resistance R 3 is connected with the input end of multiplexer, the end of the 4th filter capacitor C4 respectively, the other end of the 4th resistance R 4 is connected with the input end of multiplexer, the end of the 5th filter capacitor C5 respectively, and the two ends of the 6th filter capacitor C6 are connected with the other end of the 3rd resistance R 3, the other end of the 4th resistance R 4 respectively.
The equal ground connection of the other end of the other end of the other end of the other end of the first filter capacitor C1, the second filter capacitor C2, the 4th filter capacitor C4, the 5th filter capacitor C5.
The first resistance R 1 and the first filter capacitor C1, the second resistance R 2 and the second filter capacitor C2, the 3rd resistance R 4 and the 4th filter capacitor C4, the 4th resistance R 4 and the 5th filter capacitor C5 form respectively differential mode filtering, and the 3rd filter capacitor C3, the 6th filter capacitor C6 form respectively common mode filtering.
During use, a thermal resistance is by thermal resistance incoming end 1, thermal resistance incoming end 2 places in circuit, and a thermopair is by thermopair incoming end 3, thermopair incoming end 4 places in circuit.Voltage offset electric circuit provides bias voltage for thermopair access passage, and current source circuit provides steady current for the thermal resistance access, and the signal of multiplex electronics output converts digital signal to by analog to digital converter after operational amplifier amplifies.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and the distortion all should belong to the protection domain of the utility model claim within.
Claims (2)
1. a thermopair and thermal resistance mix the access metering circuit, it is characterized in that, comprise at least two thermal resistance incoming ends, at least two thermopair incoming ends, filtering circuit, multiplexer, voltage offset electric circuit, current source circuit, cold junction compensation circuit, operational amplifier and analog to digital converters, thermal resistance incoming end, thermopair incoming end all are connected with the input end of multiplexer by filtering circuit; Bias voltage circuit, current source circuit all are connected with the control end of multiplexer; The cold junction compensation circuit is integrated on multiplexer, is used for measuring the temperature of thermal resistance and thermopair; The output terminal of multiplexer is connected with analog to digital converter by operational amplifier.
2. thermopair as claimed in claim 1 and thermal resistance mix the access metering circuit, it is characterized in that, described filtering circuit comprises the first resistance, the second resistance, the first filter capacitor, the second filter capacitor, the 3rd filter capacitor, the 3rd resistance, the 4th resistance, the 4th filter capacitor, the 5th filter capacitor and the 6th filter capacitor; One end of the first resistance, an end of the second resistance are all as the thermal resistance incoming end, the other end of the first resistance is connected with the input end of multiplexer, an end of the first filter capacitor respectively, the other end of the second resistance is connected with the input end of multiplexer, an end of the second filter capacitor respectively, and the two ends of the 3rd filter capacitor are connected with the other end of the first resistance, the other end of the second resistance respectively; One end of the 3rd resistance, an end of the 4th resistance are all as the thermopair incoming end, the other end of the 3rd resistance is connected with the input end of multiplexer, an end of the 4th filter capacitor respectively, the other end of the 4th resistance is connected with the input end of multiplexer, an end of the 5th filter capacitor respectively, and the two ends of the 6th filter capacitor are connected with the other end of the 3rd resistance, the other end of the 4th resistance respectively; The equal ground connection of the other end of the other end of the other end of the other end of the first filter capacitor, the second filter capacitor, the 4th filter capacitor, the 5th filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220746576 CN202974486U (en) | 2012-12-30 | 2012-12-30 | Thermocouple and thermal resistor hybrid accessed measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220746576 CN202974486U (en) | 2012-12-30 | 2012-12-30 | Thermocouple and thermal resistor hybrid accessed measuring circuit |
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| Publication Number | Publication Date |
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| CN202974486U true CN202974486U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220746576 Expired - Fee Related CN202974486U (en) | 2012-12-30 | 2012-12-30 | Thermocouple and thermal resistor hybrid accessed measuring circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675596A (en) * | 2013-12-17 | 2014-03-26 | 重庆川仪自动化股份有限公司 | Wire breakage detection circuit and temperature acquisition circuit |
| CN107430164A (en) * | 2015-04-09 | 2017-12-01 | 威德米勒界面有限公司及两合公司 | The measuring circuit and measuring method of electrical component and the part for monitoring electrical component |
| CN107478349A (en) * | 2017-08-11 | 2017-12-15 | 河南天通电力有限公司 | Temperature polling instrument |
| CN112953501A (en) * | 2021-01-27 | 2021-06-11 | 宿州市泰华仪表有限公司 | Universal signal input circuit for intelligent instrument |
-
2012
- 2012-12-30 CN CN 201220746576 patent/CN202974486U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675596A (en) * | 2013-12-17 | 2014-03-26 | 重庆川仪自动化股份有限公司 | Wire breakage detection circuit and temperature acquisition circuit |
| CN103675596B (en) * | 2013-12-17 | 2016-05-25 | 重庆川仪自动化股份有限公司 | A kind of break detection circuit and temperature collection circuit |
| CN107430164A (en) * | 2015-04-09 | 2017-12-01 | 威德米勒界面有限公司及两合公司 | The measuring circuit and measuring method of electrical component and the part for monitoring electrical component |
| CN107478349A (en) * | 2017-08-11 | 2017-12-15 | 河南天通电力有限公司 | Temperature polling instrument |
| CN112953501A (en) * | 2021-01-27 | 2021-06-11 | 宿州市泰华仪表有限公司 | Universal signal input circuit for intelligent instrument |
| CN112953501B (en) * | 2021-01-27 | 2023-09-26 | 宿州市泰华仪表有限公司 | Universal signal input circuit for intelligent instrument |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20161230 |