CN100416244C - Preprocessing circuit for multiple temperature signals - Google Patents
Preprocessing circuit for multiple temperature signals Download PDFInfo
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- CN100416244C CN100416244C CNB2003101251795A CN200310125179A CN100416244C CN 100416244 C CN100416244 C CN 100416244C CN B2003101251795 A CNB2003101251795 A CN B2003101251795A CN 200310125179 A CN200310125179 A CN 200310125179A CN 100416244 C CN100416244 C CN 100416244C
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- operational amplifier
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Abstract
The present invention relates to electronic equipment of a front end, which is controlled by a computer, is used for collecting and processing signals of a temperature sensor, is provided with a plurality of signal collecting and processing channels, and is used for an automatic monitoring and control system for multiple measuring point temperature. A multi-path temperature signal pre-processing circuit comprises a machine box, a plurality of temperature signal input, a reference voltage generating circuit, and is mainly characterized in that a plurality of input circuits are connected with the corresponding signal input and an amplifying circuit; the amplifying circuit is connected with a multi-path output modulating circuit which ouputs signals; the reference voltage generating circuit is connected with the input end of each input circuit; the output end of each input circuit is connected with the amplifying circuit and is connected with the multi-path modulating circuit, or the output end of each input circuit is connected with a signal processing cuircuit of a reference end (cold end) and is connected with the multi-path output modulating circuit. The two connecting modes use a jumping device or a switch for selective arrangement. The control end of a computer is connected with the multi-path output modulating circuit. The present invention has the advantages of strong applicability that the present invention not only can be used for collecting and processing thermocouple signals, but also can be used for collecting and processing front end equipment of thermal resistance signals, high integrity that a single chip computer comprises a plurality of channels, and actualizes multi-path collection and processing, and fast processing speed.
Description
Technical field:
The present invention relates to a kind of computer-controlled, be used for front portion temperature sensor signal collection and processing, that have a plurality of signals collecting and treatment channel.Be mainly used in large-scale many measurement points automatic temperature monitoring and control system.
Background technology:
At present, be used for the temperature signal measurement or the monitoring equipment of single measurement point, no matter adopt thermistor to make temperature element, still adopt thermopair to make temperature element, all commercialization.Yet as a kind of standard, multichannel, can realize computer-controlled, be not only applicable to thermopair and make temperature sensor, and be applicable to that thermistor does temperature signal collection and treatment facility temperature sensor, that can be used for automatic temperature monitoring large-scale, that have a plurality of measurement points and control system and still see.
Summary of the invention:
The objective of the invention is to avoid the deficiencies in the prior art part and a kind of multi way temperature signal pre-processing circuit is provided.Being used for the collection and the pre-service of temperature sensor signal, is a computer-controlled multi way temperature signals collecting and treatment facility, can realize multipoint temperature monitoring by it, and it is mainly used in large-scale multi-point temp monitoring and control system automatically.
Purpose of the present invention can be by realizing by the following technical solutions: a kind of multi way temperature signal pre-processing circuit includes cabinet, a plurality of temperature signals input (CH
x), reference voltage generating circuit (C), its principal feature includes a plurality of input circuits (A) and a plurality of temperature signal input (CH
x) and a plurality of amplifying circuit (B
x) correspondence is connected; Amplifying circuit (B
x) being connected in multichannel output modulation circuit (F), multichannel is exported modulation circuit (F) output signal; Reference voltage generating circuit (C) is connected with the input end of input circuit (A); Last input circuit (A
The end) output terminal connect last amplifying circuit (B
The end) and then be connected or last input circuit (A with multichannel output modulation circuit (F)
The end) output terminal connect reference end (cold junction) signal processing circuit (D) and and then be connected with multichannel output modulation circuit (F); The computer control end is connected in multichannel output modulation circuit (F); At multichannel output modulation circuit (F) and reference end (cold junction) signal processing circuit (D), last amplifying circuit (B
The end) between be provided with jumper wire device/switch.
The present invention also includes manual control circuit (E) and is connected with multichannel output modulation circuit (F).
Described multi way temperature signal pre-processing circuit, input circuit (A
x) be by resistance R
1, resistance R
2, resistance R
3With thermistor R
tThe electric bridge of forming; R
tBe external thermistor, external thermistor R
tAn end and resistance R
1Link to each other, its junction is provided with output terminal H '; External thermistor R
tThe other end and resistance R
3Link to each other, its junction is provided with simulating signal earth terminal AGND; Resistance R
2And resistance R
3The junction be provided with output terminal L '.
Described multi way temperature signal pre-processing circuit also can be by resistance R
1, resistance R
2, resistance R
3Bridge diagram with the thermopair composition; To wherein resistance R
1, resistance R
2Default, resistance R
3Short circuit, the thermopair low level end in the bridge diagram links to each other with simulating signal earth terminal AGND, and its junction is provided with output terminal L '; Thermopair high level end place in the bridge diagram is provided with output terminal H '.
Described multi way temperature signal pre-processing circuit, amplifying circuit (B
x) be input circuit (A
x) output terminal H ' be connected in ultralow bias voltage drift operational amplifier A by resistance R A
1Positive input terminal, simulating signal earth terminal AGND end is connected in H ' end and ultralow bias voltage drift operational amplifier A by capacitor C A
1Between the positive input terminal; Simulating signal earth terminal AGND is connected in H ' end and ultralow bias voltage drift operational amplifier A by resistance R F or RG
1Between the positive input terminal, RF or RG select by jumper wire device/switch; Amplifier A
1Output terminal is connected with multichannel output modulation circuit (F).
Described multi way temperature signal pre-processing circuit, amplifying circuit (B
x) also include input circuit (A
x) output terminal L ' be connected in ultralow bias voltage drift operational amplifier A by resistance R B
1Negative input end, simulating signal earth terminal AGND is connected in L ' end and ultralow bias voltage drift operational amplifier A by capacitor C B
1Between the negative input end; Resistance R H, RI are parallel to operational amplifier A
1Between negative input end and the output terminal, RH, RI select by jumper wire device/switch.
Described multi way temperature signal pre-processing circuit also includes reference end (cold junction) signal processing circuit (D), input circuit (A
x) simulating signal earth terminal AGND be connected in ultralow bias voltage drift operational amplifier U by resistance R 6
1Positive input terminal; Input circuit (A
x) simulating signal earth terminal AGND be connected in ultralow bias voltage drift operational amplifier U by diode Q3, capacitor C 4, resistance R 5, slide rheostat P1
1Negative input end; Input circuit (A
x) simulating signal earth terminal AGND be connected in slide rheostat P1 and ultralow bias voltage drift operational amplifier U by capacitor C 3
1Negative input end; Slide rheostat P2, resistance R 7 are connected in U
1Between negative input end and the output terminal; "+" end of sensor SENSOR connects ultralow bias voltage drift operational amplifier U
1Negative input end, and "-" end connects negative voltage source-V, sensor built-in (promptly being connected in cabinet inside) or external (promptly being connected in the cabinet outside).
Described multi way temperature signal pre-processing circuit, the rear panel that also includes cabinet is provided with cascade input connector or cascade out connector; The front panel of cabinet is provided with the passage input connector; The front panel of cabinet is provided with the 220VAC voltage indicator lamp; On the rear panel of cabinet, also be provided with alternating voltage input make-and-break control switch, fuse box.
The invention has the beneficial effects as follows that applicability is strong, is a kind ofly both can be used for the acquisition process thermocouple signal, also can be used for the front-end equipment of acquisition process thermal resistance signal; The integrated level height, it is many that unit comprises port number; Carry out multichannel acquisition process simultaneously, processing speed is fast; Highly sensitive, the minimum radius of input signal is a μ V magnitude; Carry out multiselect 1 modulation output mode; Computer control, practicable multiple cases cascade.
Description of drawings:
Fig. 1 is the circuit structure block diagram of the embodiment of the invention;
Fig. 2 is first kind of input circuit structured flowchart of the present invention;
Fig. 3 is second kind of input circuit structured flowchart of the present invention;
Fig. 4 is an amplification circuit structure block diagram of the present invention;
Fig. 5 is reference end of the present invention (cold junction) signal processing circuit structure block diagram.
Embodiment:
Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:
See Fig. 1, the multi way temperature signal pre-processing circuit has cabinet, a plurality of temperature signal input CH
x, reference voltage generating circuit C, its principal feature includes a plurality of input circuit A
xWith a plurality of temperature signal input CH
xWith a plurality of amplifying circuit B
xCorrespondence is connected; Amplifying circuit B
xBe connected in multichannel output modulation circuit F, multichannel output modulation circuit F output signal; Reference voltage generating circuit C and input circuit A, input end be connected; Last input circuit A
The endOutput terminal connect last amplifying circuit B
The endAnd then be connected or last input circuit A with multichannel output modulation circuit F
The endOutput terminal connect reference end (cold junction) signal processing circuit D and and then be connected with multichannel output modulation circuit F; The computer control end is connected in multichannel output modulation circuit F.At multichannel output modulation circuit F and reference end (cold junction) signal processing circuit D, last amplifying circuit B
The endBetween be provided with jumper wire device/switch, two kinds of connected modes adopt jumper wire device/switches to select to be provided with.A plurality of temperature signal input CH
x, a plurality of input circuit A
xWith a plurality of amplifying circuit B
xX be 32.Can realize the multiple cases cascade, single computer is directly controlled, but maximum eight cabinets of cascade reach 256 input channels.Manual control circuit E is connected with multichannel output modulation circuit F.
Fig. 2 is first kind of input circuit structured flowchart.Input circuit A
x, be by resistance R
1, resistance R
2, resistance R
3With thermistor R
tThe electric bridge of forming; R
tBe external thermistor, external thermistor R
tAn end and resistance R
1Link to each other, its junction is provided with output terminal H '; External thermistor R
tThe other end and resistance R
3Link to each other, its junction is provided with simulating signal earth terminal AGND; Resistance R
2And resistance R
3The junction be provided with output terminal L '.
Fig. 3 is second kind of input circuit structured flowchart.Input circuit A
x, also can be by resistance R
1, resistance R
2, resistance R
3Form the bridge diagram form with thermopair, just incite somebody to action wherein resistance R
1, resistance R
2Default, resistance R
3Short circuit, the thermopair low level end simulating signal earth terminal AGND in the bridge diagram links to each other, and its junction is provided with output terminal L '; Thermopair high level end place in the bridge diagram is provided with output terminal H '.Adopt two-wire system input connected mode.
Fig. 4 is the amplification circuit structure block diagram.Amplifying circuit B
xBe input circuit (A
x) output terminal H ' be connected in ultralow bias voltage drift operational amplifier A by resistance R A
1Positive input terminal, simulating signal earth terminal AGND is connected in H ' end and ultralow bias voltage drift operational amplifier A by capacitor C A
1Between the positive input terminal; Simulating signal earth terminal AGND is connected in H ' end and ultralow bias voltage drift operational amplifier A by resistance R F or RG
1Between the positive input terminal, RF or RG can select by jumper wire device/switch; Amplifier A
1Output terminal is connected with multichannel output modulation circuit F.
Amplifying circuit B
xAlso include input circuit (A
x) output terminal L ' be connected in ultralow bias voltage drift operational amplifier A by resistance R B
1Negative input end, simulating signal earth terminal AGND is connected in L ' end and ultralow bias voltage drift operational amplifier A by capacitor C B
1Between the negative input end; Resistance R H, RI are parallel to operational amplifier A
1Between negative input end and the output terminal; RH, RI can select by jumper wire device/switch.
Fig. 5 is reference end (cold junction) signal processing circuit structure block diagram.Reference end (cold junction) the signal processing circuit D of multi way temperature signal pre-processing circuit, input circuit A
1Simulating signal earth terminal AGND be connected in ultralow bias voltage drift operational amplifier U by resistance R 6
1Positive input terminal; Input circuit A
1Simulating signal earth terminal AGND be connected in ultralow bias voltage drift operational amplifier U by diode Q3, capacitor C 4, resistance R 5, slide rheostat P1
1Negative input end; Input circuit A
1Simulating signal earth terminal AGND be connected in slide rheostat P1 and ultralow bias voltage drift operational amplifier U by capacitor C 3
1Negative input end; Slide rheostat P2, resistance R 7 are connected in U
1Between negative input end and the output terminal; "+" end of sensor SENSOR connects ultralow bias voltage drift operational amplifier U
1Negative input end, and "-" end connects negative voltage source-V, sensor built-in (promptly being connected in cabinet inside) also can external (promptly being connected in the cabinet outside).Reference end (cold junction) signal processing circuit is used to gather and handle the temperature signal at reference end place.Be anti-phase summation amplifying circuit, adopt ultralow bias voltage, ultralow bias voltage drift operational amplifier to constitute, its circuit form is an anti-phase summation amplifying circuit.Summing circuit has two input branch roads, comes to produce circuit from quiescent bias current, and it mainly adopts low temperature coefficient of deviation reference diode Q3 and biasing resistor R5, P1 to constitute; Another road is from temperature sensor, as mentioned above, temperature sensor can adopt built-in (promptly be installed in and place box house on the circuit board), also can adopt circumscribed (promptly placing the casing outside), and lead-in wire enters the circuit of box house by the 32nd passage input connector; The 32nd passage of each cabinet is a special passage, and it can accept occasionally thermal resistance signal input of thermoelectricity, also can accept the input of external sensor signal, adopts jumper wire device/switch to select and change between the different input modes.
The rear panel of the casing of multi way temperature signal pre-processing circuit is provided with the cascade input connector or is the cascade out connector; The front panel of casing is provided with the passage input connector; The multi way temperature signal pre-processing circuit adopts the 220VAC power voltage supply, the 220VAC input connector is single-phase 3-PIN blanket socket, the 220VAC input connector is positioned on the rear panel of casing, a 220VAC input make-and-break control switch and a fuse box also are installed on the rear panel of instrument, and the front panel of cabinet is provided with the 220VAC voltage indicator lamp.
Manual control circuit E is that a logic level is provided with circuit, and it is made of switch and TTL phase inverter.Also can realize multiselect 1 modulation output function by this circuit, when the unit case is worked, can realize that 32 select 1 modulation output; When multiple cases is worked, can realize that at most 256 select 1 modulation output.
Multichannel output modulation circuit F has multichannel modulation follower, and it adopts high precision, high-speed analog switch to constitute; Also have decoding scheme, realize the gating control function, it mainly is made up of code translator and some logical devices; The case number (CN) of being identification circuit is arranged, and it also is the strobe generation circuit of decoding scheme.The case number (CN) identification circuit adopts elements such as a digital comparator and switch to constitute; Output buffering/buffer circuit is arranged simultaneously, in multichannel output modulation circuit F, be provided with an output buffering/buffer circuit; It is the follower circuit that adopts integrated operational amplifier to constitute.Multichannel output modulation circuit F has two kinds of way of outputs to select, and one is the buffering way of output, promptly by above-mentioned output buffering/buffer circuit output signal; Another is the direct way of output, promptly not by output buffering/buffer circuit, and direct output signal.Dual mode can select jumper wire device/switch to select to be provided with by the way of output.
Claims (8)
1. a multi way temperature signal pre-processing circuit includes cabinet, a plurality of temperature signal input (CH
x), reference voltage generating circuit (C), its feature includes a plurality of input circuit (A
x) import (CH with a plurality of temperature signals
x) and a plurality of amplifying circuit (B
x) correspondence is connected; Amplifying circuit (B
x) being connected in multichannel output modulation circuit (F), multichannel is exported modulation circuit (F) output signal; Reference voltage generating circuit (C) and input circuit (A
x) input end connect; Last input circuit (A
The end) output terminal connect last amplifying circuit (B
The end) and then be connected or last input circuit (A with multichannel output modulation circuit (F)
The end) output terminal connect reference end signal treatment circuit (D) and and then be connected with multichannel output modulation circuit (F); The computer control end is connected in multichannel output modulation circuit (F); At multichannel output modulation circuit (F) and reference end signal treatment circuit (D), last amplifying circuit (B
The end) between be provided with jumper wire device/switch.
2. multi way temperature signal pre-processing circuit as claimed in claim 1, its feature also include manual control circuit (E) and are connected with multichannel output modulation circuit (F).
3. multi way temperature signal pre-processing circuit as claimed in claim 1 is characterized in that input circuit (A
x) be by resistance R
1, resistance R
2, resistance R
3With thermistor R
tThe electric bridge of forming; R
tBe external thermistor, external thermistor R
tAn end and resistance R
1Link to each other, its junction is provided with output terminal H '; External thermistor R
tThe other end and resistance R
3Link to each other, its junction is provided with simulating signal earth terminal AGND; Resistance R
2And resistance R
3The junction be provided with output terminal L '.
4. multi way temperature signal pre-processing circuit as claimed in claim 1 is characterized in that input circuit (A
x) be by resistance R
1, resistance R
2, resistance R
3Bridge diagram with the thermopair composition; To wherein resistance R
1, resistance R
2Default, resistance R
3Short circuit, the thermopair low level end in the bridge diagram links to each other with simulating signal earth terminal AGND, and its junction is provided with output terminal L '; Thermopair high level end place in the bridge diagram is provided with output terminal H '.
5. multi way temperature signal pre-processing circuit as claimed in claim 4 is characterized in that amplifying circuit (B
x) be: input circuit (A
x) output terminal H ' be connected in ultralow bias voltage drift operational amplifier A by resistance R A
1Positive input terminal, simulating signal earth terminal AGND end is connected in H ' end and ultralow bias voltage drift operational amplifier A by capacitor C A
1Between the positive input terminal; Simulating signal earth terminal AGND is connected in H ' end and ultralow bias voltage drift operational amplifier A by resistance R F or RG
1Between the positive input terminal, RF or RG select by jumper wire device/switch; Amplifier A
1Output terminal is connected with multichannel output modulation circuit (F).
6. multi way temperature signal pre-processing circuit as claimed in claim 5 is characterized in that amplifying circuit (B
x) be: input circuit (A
x) output terminal L ' be connected in ultralow bias voltage drift operational amplifier A by resistance R B
1Negative input end, simulating signal earth terminal AGND is connected in L ' end and ultralow bias voltage drift operational amplifier A by capacitor C B
1Between the negative input end; Resistance R H, RI are parallel to operational amplifier A
1Between negative input end and the output terminal, RH, RI select by jumper wire device/switch.
7. multi way temperature signal pre-processing circuit as claimed in claim 1 is characterized in that reference end signal treatment circuit (D) is: input circuit (A
x) simulating signal earth terminal AGND be connected in ultralow bias voltage drift operational amplifier U by resistance R 6
1Positive input terminal; Input circuit (A
x) simulating signal earth terminal AGND be connected in ultralow bias voltage drift operational amplifier U by low temperature coefficient of deviation reference diode Q3, capacitor C 4, resistance R 5, slide rheostat P1
1Negative input end; Input circuit (A
x) simulating signal earth terminal AGND be connected in slide rheostat P1 and ultralow bias voltage drift operational amplifier U by capacitor C 3
1Negative input end; Slide rheostat P2, resistance R 7 are connected in U
1Between negative input end and the output terminal; "+" end of sensor SENSOR connects ultralow bias voltage drift operational amplifier U
1Negative input end, and "-" end connects negative voltage source-V, sensor is built-in or external.
8. the rear panel that multi way temperature signal pre-processing circuit as claimed in claim 7, its feature also include cabinet is provided with cascade input connector or cascade out connector; The front panel of cabinet is provided with the passage input connector; The front panel of cabinet is provided with the 220VAC voltage indicator lamp; On the rear panel of cabinet, also be provided with alternating voltage input make-and-break control switch, fuse box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101251795A CN100416244C (en) | 2003-12-27 | 2003-12-27 | Preprocessing circuit for multiple temperature signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101251795A CN100416244C (en) | 2003-12-27 | 2003-12-27 | Preprocessing circuit for multiple temperature signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1635349A CN1635349A (en) | 2005-07-06 |
| CN100416244C true CN100416244C (en) | 2008-09-03 |
Family
ID=34845116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101251795A Expired - Fee Related CN100416244C (en) | 2003-12-27 | 2003-12-27 | Preprocessing circuit for multiple temperature signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100416244C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109662B (en) * | 2006-07-17 | 2010-09-29 | 梅特勒-托利多仪器（上海）有限公司 | Thermal resistance temperature surveying circuit |
| CN101666690B (en) * | 2009-09-08 | 2011-10-05 | 深圳和而泰智能控制股份有限公司 | Method and device for simulating NTC sensor parameters |
| CN106525318B (en) * | 2016-12-16 | 2022-07-01 | 山东金洲科瑞节能科技有限公司 | Bus type pressure measuring device |
| US10330538B2 (en) * | 2017-02-21 | 2019-06-25 | Rosemount Inc. | Thermocouple temperature sensor with cold junction compensation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87208972U (en) * | 1987-06-11 | 1988-03-23 | 机械工业部北京机械工业自动化研究所 | Intelligent multi-channel temperature measurer |
| CN2119648U (en) * | 1992-04-21 | 1992-10-21 | 江培辉 | Multichannel two-line thermometer with thermal resistance |
| US6494616B1 (en) * | 2000-08-04 | 2002-12-17 | Regents Of The University Of Minnesota | Multiplexed sensor array |
| CN2672633Y (en) * | 2003-12-27 | 2005-01-19 | 中国科学院近代物理研究所 | Multipath temperature signal pretreating circuit |
-
2003
- 2003-12-27 CN CNB2003101251795A patent/CN100416244C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87208972U (en) * | 1987-06-11 | 1988-03-23 | 机械工业部北京机械工业自动化研究所 | Intelligent multi-channel temperature measurer |
| CN2119648U (en) * | 1992-04-21 | 1992-10-21 | 江培辉 | Multichannel two-line thermometer with thermal resistance |
| US6494616B1 (en) * | 2000-08-04 | 2002-12-17 | Regents Of The University Of Minnesota | Multiplexed sensor array |
| CN2672633Y (en) * | 2003-12-27 | 2005-01-19 | 中国科学院近代物理研究所 | Multipath temperature signal pretreating circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1635349A (en) | 2005-07-06 |
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Granted publication date: 20080903 Termination date: 20121227 |