CN203011562U

CN203011562U - Thermocouple signal acquisition and process apparatus based on STC12C5A60S2 single chip microcomputer

Info

Publication number: CN203011562U
Application number: CN201220634504.5U
Authority: CN
Inventors: 白艳祥
Original assignee: Dalian Maritime University
Current assignee: Dalian Maritime University
Priority date: 2012-11-27
Filing date: 2012-11-27
Publication date: 2013-06-19
Anticipated expiration: 2022-11-27

Abstract

The utility model discloses a thermocouple signal acquisition and process apparatus based on STC12C5A60S2 single chip microcomputer (SCM). The thermocouple signal acquisition and process apparatus comprises an input end 1, a coding switch, a demultiplexer, a thermocouple cold end compensator, an amplifier, a digital potentiometer, a SCM, a nixie tube and an alarm unit, wherein the input end 1 is respectively in electric connection with the demultiplexer and the amplifier which is electrically connected with the digital potentiometer, the demultiplexer is electrically connected with the thermocouple cold end compensator, and the coding switch is respectively in electric connection with the demultiplexer and the SCM which is respectively in electric connection with the amplifier, the digital potentiometer, the nixie tube and the alarm unit. The thermocouple signal acquisition and process apparatus based on STC12C5A60S2 SCM acquires and processes thermocouple signals of various types through combination of software and hardware. The thermocouple signal acquisition and process apparatus is capable of processing thermocouple signals of various types with only one input port.

Description

Thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer

Technical field

The utility model relates to the automatic measurement control field.

Background technology

in many traditional industries, particularly at the automatic measurement control field, the detection of temperature parameter has important impact to the robotization control procedure, at present, the most widely used is PT100 and thermopair, because the temperature-measuring range of thermopair is wide, be applicable to measure high temperature, so it is very extensive that thermocouple temperature sensor uses, such as the principle of work of certain thermopair is: the conductor of two kinds of different components, two ends are through welding, form the loop, directly measuring junction at working end (hot junction) connection terminal end cold junction, when there are the temperature difference in hot junction and cold junction, will produce thermocurrent in the loop, connect Displaying Meter, will indicate the corresponding temperature value of the thermopower that produces on instrument, electromotive force raises with temperature and increases, the size of thermopower is only relevant with the temperature at the material of thermopair and two ends, irrelevant with the length thickness of thermopair, the main species difference of thermopair is different and different in the material of its thermocouple core (two thermo wires), the electromotive force that it is exported is also different, the voltage signal of exporting due to thermopair is all other feeble signal of mv level, the interference of Industry Control occasion in addition, can't be to this direct processing, so must signal be converted into the signal that processor can be processed through amplifying, but because the electromotive force of the thermopair output of every type is different, so also different for the enlargement factor that the thermopair of every type is required, during thermocouple measuring temperature, measure in theory take cold junction at zero degree as canonical measure, yet, when usually measuring, instrument is under room temperature, due to the non-vanishing degree of cold junction, cause the thermoelectricity potential difference to reduce, make to measure and forbidden, mistake appears.

Summary of the invention

In order to overcome the problem of above-mentioned prior art, the utility model provides the thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer.

In order to achieve the above object, a kind of thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer that provides.described thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer comprises input end 1, code switch, demultiplexer, thermocouple cold end compensator, amplifier, digital regulation resistance, single-chip microcomputer, charactron, the alarm unit place, wherein, input end 1 is connected with amplifier electric with demultiplexer respectively, amplifier is electrically connected to digital regulation resistance, demultiplexer is electrically connected to thermocouple cold end compensator, code switch is electrically connected to demultiplexer and single-chip microcomputer respectively, single-chip microcomputer respectively with amplifier, digital regulation resistance, charactron, the alarm unit place is electrically connected to.

Beneficial effect: the thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer of the present utility model can by polytype thermocouple signal of sending here in conjunction with acquisition process of software and hardware, make thermopair collection signal treating apparatus only need an input port just can process dissimilar thermocouple signal.

Description of drawings

Fig. 1 the utility model is based on the structural drawing of the thermocouple signal acquisition treating apparatus of STC12C5A60S2 single-chip microcomputer.

Accompanying drawing sign: 1, input end.

Embodiment

The present invention is described in detail below in conjunction with drawings and Examples.

with reference to Fig. 1, in the present embodiment, described thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer comprises input end 1, code switch, demultiplexer, thermocouple cold end compensator, amplifier, digital regulation resistance, single-chip microcomputer, charactron, the alarm unit place, wherein, input end 1 is connected with amplifier electric with demultiplexer respectively, amplifier is electrically connected to digital regulation resistance, demultiplexer is electrically connected to thermocouple cold end compensator, code switch is electrically connected to demultiplexer and single-chip microcomputer respectively, single-chip microcomputer respectively with amplifier, digital regulation resistance, charactron, the alarm unit place is electrically connected to.

(1) many outlet selectors of described thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer are to select as required different passages output input signals; Thermocouple cold end compensator is to carry out cold junction compensation to dissimilar thermopair; The numeral current potential is by I2C bus and single chip communication, by the resistance value of Single-chip Controlling digital regulation resistance output, as the operational amplifier feedback resistance; Operational amplifier is to control its enlargement factor by digital regulation resistance; The STC12C5A60S2 single-chip microcomputer is to have 10 inner integrated A/D converters, and the analog signals of direct processing input can be set.

(2) thermocouple signal of a certain type is after the input end input, enter junction compensator after cold junction process multichannel selection outlet selector and carry out cold junction compensation, the other end is processed and amplifies through being carried out by the amplifier that digital regulation resistance is regulated enlargement factor signal, sending at last the STC12C5A60S2 single-chip microcomputer processes, signal after processing can send to data at the places, monitoring, alarming unit such as host computer by serial port or Industrial Ethernet, also can show in real time in this locality by charactron simultaneously.

(3) signal that gathers due to the thermopair of every type is processed different from enlargement factor, cold junction compensation requires also different, so based on the thermocouple signal acquisition treating apparatus of STC12C5A60S2 single-chip microcomputer can be according to actual needs combination by software and hardware make this collection signal device one tunnel input channel can the polytype thermocouple signal of acquisition process, now take E type thermopair as example, when learning to gather E type thermocouple signal the time, code switch is threaded to 1(E) position, this moment, code switch was with corresponding signal, on the one hand, send into demultiplexer, make E type cold thermocouple end signal from the rear corresponding thermocouples junction compensator E type input pin of demultiplexer passage output, on the other hand, code switch is delivered to the STC12C5A60S2 single-chip microcomputer with corresponding signal, the code switch signal of single-chip microcomputer by sending here, what judgement was inputted is E type thermopair input signal, lead to and cross I2C bus output data to digital regulation resistance, change the amplifier feedback resistance, make the required enlargement factor of the corresponding E type thermocouple signal of enlargement factor of amplifier, just can directly send into single-chip microcomputer after E type thermocouple signal is processed through amplification processes, the realization of single-chip microcomputer judgement processing capacity is wherein realized by the good program of software programming in advance by its inside, the thermocouple signal principle of other several types of acquisition process is with above-mentioned E type.

Above content is the further description of the present invention being done in conjunction with optimal technical scheme, can not assert that the concrete enforcement of invention only limits to these explanations.Concerning the general technical staff of the technical field of the invention, under the prerequisite that does not break away from design of the present invention, can also make simple deduction and replacement, all should be considered as protection scope of the present invention.

Claims

1. thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer, it is characterized in that, described thermocouple signal acquisition treating apparatus based on the STC12C5A60S2 single-chip microcomputer comprises input end (1), code switch, demultiplexer, thermocouple cold end compensator, amplifier, digital regulation resistance, single-chip microcomputer, charactron, the alarm unit place, wherein, input end (1) is connected with amplifier electric with demultiplexer respectively, amplifier is electrically connected to digital regulation resistance, demultiplexer is electrically connected to thermocouple cold end compensator, code switch is electrically connected to demultiplexer and single-chip microcomputer respectively, single-chip microcomputer respectively with amplifier, digital regulation resistance, charactron, the alarm unit place is electrically connected to.