CN101922978B - Temperature measuring device - Google Patents
Temperature measuring device Download PDFInfo
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- CN101922978B CN101922978B CN2010102282729A CN201010228272A CN101922978B CN 101922978 B CN101922978 B CN 101922978B CN 2010102282729 A CN2010102282729 A CN 2010102282729A CN 201010228272 A CN201010228272 A CN 201010228272A CN 101922978 B CN101922978 B CN 101922978B
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Abstract
The invention discloses a temperature measuring device. The device comprises an acquisition module, a temperature sensor, a conversion part and a signal bus, wherein the acquisition module and the temperature sensor are connected with a power supply through a shared power line; the first end of the temperature sensor is connected with the power line; the second end of the temperature sensor is connected with the first end of the conversion part; the second end of the conversion part is earthed; the two ends of the conversion part are respectively connected with two idle input channels of the acquisition module; the output end of the acquisition module is connected with the signal bus; and the acquisition module is earthed. By adopting the temperature measuring device of the embodiment of the invention, resources can be saved and cost can be reduced very well.
Description
Technical field
The present invention relates to the temperature survey field, relate to a kind of temperature measuring equipment in particular.
Background technology
In the surrounding air automatic monitoring system, in order to guarantee the operate as normal of monitoring equipment, need be to the temperature in environmental monitoring station's station; And the temperature in the core monitoring equipment rack is monitored; Through install an air-conditioner, equipment such as heating installation, require within the specific limits the control of station temperature, generally be 25 ℃ ± 5 ℃; With the error of the temperature effect that reduces equipment, and can compensate measurement data through temperature in temperature or the station in the rack of measuring.It is thus clear that data acquisition system (DAS) also will be gathered in the station and temperature in the system cabinet when gathering meteorologic parameter in the monitoring equipment.
To the measurement of temperature in temperature in the station and the system cabinet, traditional device is to adopt a power supply monitoring appearance that has the temperature survey function to carry out thermometric, and said power supply monitoring appearance receives the signal of the temperature of temperature sensor output; Through signal processing circuit; Temperature signal after handling is shown with LED (Light EmittingDiode, light emitting diode) charactron, simultaneously; This temperature signal is exported to data acquisition system (DAS), and described temperature sensor is two PT100 RTDs.
In the prior art; All adopt distributed module in whole monitoring system; Power parameter also uses under the prerequisite of distributed module; In order to measure temperature and cabinet temperature in the station and increase by one for the useless power supply monitoring appearance of monitoring system, will cause the significant wastage on the resource, the cost of system's thermometric is increased.And the integrated design of power supply monitoring appearance, also reduced the reliability of system.Utilize the PT100 platinum resistor temperature measuring, also need the power supply and the signal processing circuit of special, this has also increased the cost of system.
Summary of the invention
In view of this, the present invention provides a kind of and can economize on resources, reduce cost temperature measuring equipment.
For realizing above-mentioned purpose, the present invention provides following technical scheme:
A kind of temperature measuring equipment comprises: acquisition module, temperature sensor, converting member and signal bus.
Said acquisition module links to each other with power supply through shared power lead with said temperature sensor; Said temperature sensor first end links to each other with power lead; Second end of said temperature sensor links to each other with first end of said converting member, the second end ground connection of said converting member, and the two ends of said converting member link to each other with two idle input channels of said acquisition module respectively; Said acquisition module output terminal is connected with said signal bus, said acquisition module ground connection.
Preferably, said acquisition module comprises many group signalling channel input ends, data-signal output terminal, power end and earth terminal.
Preferably, said converting member is a precision resistance.
Preferably, said converting member is the change-over circuit with adjusting at zero point and slope adjustment.
Preferably, said temperature sensor is an integrated temperature sensor.
Preferably, said power supply is the 24V direct supply.
Can know that via above-mentioned technical scheme compared with prior art, the present invention openly provides a kind of temperature measuring equipment based on acquisition module; Utilize that existing hardware resource carries out thermometric in the system; Needn't increase other temperature measuring equipment, thereby practice thrift resource, reduce system cost.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
The structural drawing of the temperature measuring equipment that Fig. 1 provides for the embodiment of the invention one;
The structural drawing of the temperature measuring equipment that Fig. 2 provides for the embodiment of the invention two.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention discloses a kind of temperature measuring equipment, said temperature measuring equipment utilizes the hardware idling-resource of system, realizes temperature survey, need not increase other temperature measuring equipment, has practiced thrift resource, thereby has reduced cost.
Temperature measuring equipment of the present invention comprises acquisition module, temperature sensor, converting member and signal bus.
Said acquisition module links to each other with power supply through shared power lead with said temperature sensor; Said temperature sensor first end links to each other with power lead; Second end of said temperature sensor links to each other with first end of said converting member, the second end ground connection of said converting member, and the two ends of said converting member link to each other with two idle input channels of said acquisition module respectively; Said acquisition module output terminal is connected with said signal bus, said acquisition module ground connection.
Acquisition module described in the embodiment of the invention has a plurality of signal input channels; Said temperature measuring equipment is to utilize the idle channel of said acquisition module to carry out temperature survey; Other passage is used for the performance parameter of acquisition system needs; The great like this hardware resource that utilizes system has been saved the cost of system.
With reference to shown in Figure 1, be the temperature measuring equipment structural drawing of the embodiment of the invention one.The acquisition module of temperature measuring equipment is a distributed simulation amount acquisition module.
In conjunction with Fig. 1, this temperature measuring equipment comprises: distributed simulation amount acquisition module 1, temperature sensor 2, converting member 3 and signal bus 4.
Wherein, Distributed simulation amount acquisition module 1 links to each other with the power supply (not shown) through shared power lead 5 with temperature sensor 2; First end of temperature sensor 2 links to each other with power lead 5; Second end of temperature sensor 2 links to each other with first end of converting member 3, the second termination ground wire 6 of converting member 3, and the two ends of said converting member 3 link to each other with two idle input channels of distributed simulation amount acquisition module 1; The output terminal of distributed simulation amount acquisition module 1 links to each other with signal bus 4, said distributed simulation amount acquisition module 1 earth terminal ground wire 6.Distributed simulation amount acquisition module 1 comprises: data-signal output terminal, power end, earth terminal and a plurality of signalling channel input end.
Distributed simulation amount acquisition module has a plurality of signalling channel input ends in the embodiment of the invention; Temperature measuring equipment utilizes the idle channel collecting temperature signal of this distributed simulation amount acquisition module; Carry out temperature survey, other passage is used for the required performance parameter of acquisition system.Therefore, can utilize the hardware resource of total system efficiently, and the cost of temperature sensor that increases and resistance etc. is very low, has saved the cost of system.
If when needing to measure multi way temperature; Then need a plurality of temperature sensors of relative set; In the embodiment of the invention; Preferably, a plurality of temperature sensors can a shared distributed simulation amount acquisition module, utilizes a plurality of signal input parts in the said distributed simulation amount acquisition module idle channel to gather the multi way temperature signals.
In order to make the acquired signal precision high, the linear response degree is high, and preferred, described temperature sensor can adopt integrated temperature sensor, and further, said integrated temperature sensor can adopt the AD590 that does not need accessory power supply.
In order to make detected voltage signal more accurate, preferred, described converting member can be precision resistance, and resistance value is set to 1K.Said precision resistance can be bigger voltage signal with the Weak current conversion of signals that integrated temperature sensor is exported signal, so that said distributed simulation amount acquisition module is gathered.
Wherein, the acquired signal range of distributed simulation amount acquisition module 1 is set to ± 500MV.
Preferably, power supply can adopt the 24VDC power supply.
In order to use and easy to carry, preferred, integrated temperature sensor 2 and converting member 3 can be installed in the inside of distributed simulation amount acquisition module 1.
Preferably, signal bus 4 can adopt 485 signal buss.
Said 485 signal buss are received on the host computer through the mode of 485 communication modules; Host computer and communication module constitute the hardware of host computer; The monitoring software of supporting this 485 communication module is installed in host computer, can be realized scale transformation and calibration temperature signal.
Wherein, described monitoring software can be DCS (Distributed Control System, dcs) or special monitoring of software.
One of application of the specific embodiment of the invention one is to be applied in the auto-monitor of surrounding air quality system; When distributed simulation amount acquisition module is gathered meteorologic parameter; Utilize the idle channel of module that temperature signal is gathered; Like this good use the hardware resource of total system, need not increase other temperature measuring equipment and just can measure temperature, saved the cost of system.
With reference to shown in Figure 2, the structural drawing of the temperature measuring equipment that provides for the embodiment of the invention two, wherein, acquisition module is a distributed simulation amount acquisition module.
The difference of embodiment of the invention two devices structure and embodiment one is that converting member is regulated and slope adjustment function conversion circuit for having zero point.
In conjunction with Fig. 2, this temperature measuring equipment comprises: distributed simulation amount acquisition module 11, temperature sensor 12, converting member 13 and signal bus 14.
Wherein, Distributed simulation amount acquisition module 11 links to each other with power supply through power lead 15 with temperature sensor 12; First end of temperature sensor 12 links to each other with power lead 15; Second end of temperature sensor 12 links to each other with first end of converting member 13, the second termination ground wire 16 of converting member 13, and the two ends of said converting member 13 link to each other with two idle input channels of distributed simulation amount acquisition module 11; The output terminal of distributed capture module 11 links to each other with signal bus 14, said distributed simulation amount acquisition module 11 earth terminal ground wires 16.
Distributed simulation amount acquisition module 11 comprises: data-signal output terminal, power end, earth terminal and a plurality of signalling channel input end.
More accurate for the voltage that makes detected said converting member 13, and can regulate according to specific requirement, preferred, said converting member 13 is for having zero point and regulate and the change-over circuit of slope adjustment.
Said change-over circuit is made up of fixed resistance R1, R2, R3 and potentiometer RP1, RP2, and said R1 and RP1 form the slope adjustment circuit, and said resistance R 2, R3 and RP2 form zero adjustment circuit.
Wherein, temperature sensor 12 second ends link to each other with the sliding end of potentiometer RP1, and second end of potentiometer RP1 links to each other with first end of resistance R 1, the second termination ground wire 16 of resistance R 1.
First end of resistance R 2 links to each other with power supply through power lead 15; Second end of resistance R 2 and potentiometer RP2 first end link to each other; Second end of said RP2 links to each other with first end of resistance R 3, and second end of said resistance R 3 links to each other with second end of resistance R 1 and ground wire 16.
The sliding end of the sliding end of potentiometer RP1 and potentiometer RP2 links to each other with two idle channels of acquisition module 11 respectively.
By above circuit connecting relation, said slope adjustment circuit is the conditioning signal magnification ratio as required, realizes through the resistance that changes potentiometer RP1, and concrete implementation procedure is following:
In conjunction with Fig. 2, Vt=(RP1X+R1) * IS.
In the formula: IS is the marking current of temperature sensor according to variation of temperature output, is regarded as variable x; R1 is the fixed resistance value; RP1X is the resistance value of potentiometer RP1 sliding end contact and resistance R 1 link; This resistance value changes with the mobile of contact, and is as shown in Figure 2, and the resistance of contact RP1X when moving left becomes big; The resistance of RP1X diminishes during past moving right, thereby the RP1X resistance changes the value of Vt.If regard Vt=(RP1X+R1) * IS the function expression of y=K*x as, the RP1X change in resistance just is equivalent to change slope K, has promptly regulated the signal magnification ratio.
The signal that temperature sensor comes out usually can be with temperature, atmospheric pressure, and environmental factors such as time are drifted about; The transfer resistance second end ground connection among the embodiment one; Voltage is 0V, and voltage may drift about after device work a period of time, and is preferred; Described zero adjustment circuit can reduce the error that drift phenomenon causes, realizes through the resistance that changes RP2.Concrete implementation method is following:
In conjunction with Fig. 2, can find out final temperature signal: VS=(VINX+)-(VINX-)=Vt-Vf=(RP1X+R1) * IS-Vf (mathematical model is y=K*x+b) according to the function of analogue collection module.
It is thus clear that zero-point voltage is by the decision of the size of Vf, the Vf of this moment possibly not be GND at common electric zero point, but can pass through resistance R 2, R3, the value that the potential-divider network of potentiometer RP3 composition is regulated.Concrete computing formula is:
Vf＝(RP2X+R3)/(R2+R3+RP3)*(VSS-GND)。
In the formula: VSS is a supply voltage; GND is power supply ground; R2 and R3 are the fixed resistance values; RP2X is the resistance value of potentiometer RP2 sliding end contact and resistance R 3 links; This resistance value changes with the mobile of contact; As shown in Figure 2, the resistance of contact RP2X when moving left becomes big, and the resistance of RP2X diminishes when moving right; Thereby the RP2X resistance changes the value of Vf, realizes the adjusting at zero point.
Other technical scheme can repeat no more referring to described in the specific embodiment one here in the present embodiment two.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (5)
1. a temperature measuring equipment is characterized in that, said temperature measuring equipment comprises: acquisition module, temperature sensor, converting member and signal bus;
Said acquisition module links to each other with power supply through shared power lead with temperature sensor; Said temperature sensor first end links to each other with said power lead; Second end of said temperature sensor links to each other with first end of said converting member, the second end ground connection of said converting member, and the two ends of said converting member link to each other with two idle input channels of said acquisition module respectively; Said acquisition module output terminal is connected with said signal bus, said acquisition module ground connection; Said converting member is regulated and slope adjustment function conversion circuit for having zero point;
Said change-over circuit is made up of fixed resistance R1, fixed resistance R2, fixed resistance R3 and potentiometer RP1, potentiometer RP2; Said fixed resistance R1 and potentiometer RP1 form the slope adjustment circuit, and said fixed resistance R2, fixed resistance R3 and potentiometer RP2 form zero adjustment circuit;
Wherein, temperature sensor (12) second ends link to each other with the sliding end of potentiometer RP1, and second end of potentiometer RP1 links to each other with first end of fixed resistance R1, the second termination ground wire (16) of fixed resistance R1;
First end of fixed resistance R2 links to each other with power supply through power lead (15); Second end of fixed resistance R2 and potentiometer RP2 first end link to each other; Second end of said potentiometer RP2 links to each other with first end of fixed resistance R3, and second end of said fixed resistance R3 links to each other with second end of fixed resistance R1 and ground wire (16);
The sliding end of the sliding end of potentiometer RP1 and potentiometer RP2 links to each other with two idle channels of acquisition module (11) respectively.
2. device according to claim 1 is characterized in that, said acquisition module comprises data-signal output terminal, power end, earth terminal and a plurality of signalling channel input end.
3. device according to claim 1 is characterized in that, said converting member is a precision resistance.
4. according to claim 1 or 3 described devices, it is characterized in that said temperature sensor is an integrated temperature sensor.
5. according to claim 1 or 3 described devices, it is characterized in that said power supply is the 24V direct supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102282729A CN101922978B (en) | 2010-07-09 | 2010-07-09 | Temperature measuring device |
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| CN2010102282729A CN101922978B (en) | 2010-07-09 | 2010-07-09 | Temperature measuring device |
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| CN101922978A CN101922978A (en) | 2010-12-22 |
| CN101922978B true CN101922978B (en) | 2012-07-25 |
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| CN101615001A (en) * | 2008-06-26 | 2009-12-30 | 北京谊安医疗系统股份有限公司 | The multiplexer of single bus interface signal ground |
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| US6647735B2 (en) * | 2000-03-14 | 2003-11-18 | Hussmann Corporation | Distributed intelligence control for commercial refrigeration |
| CN101435373A (en) * | 2008-12-15 | 2009-05-20 | 芜湖卓越线束系统有限公司 | Air inlet temperature sensor for automobile |
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