CN202533755U - Sampling circuit for paperless recording instrument - Google Patents
Sampling circuit for paperless recording instrument Download PDFInfo
- Publication number
- CN202533755U CN202533755U CN2011205653400U CN201120565340U CN202533755U CN 202533755 U CN202533755 U CN 202533755U CN 2011205653400 U CN2011205653400 U CN 2011205653400U CN 201120565340 U CN201120565340 U CN 201120565340U CN 202533755 U CN202533755 U CN 202533755U
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- operational amplifier
- circuit
- recording instrument
- amplifier
- signals
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Abstract
The utility model relates to a sampling circuit for a paperless recording instrument. A single-chip microcomputer controls three multi-channel analogue signal switches to collect various signals on spot, and the collected signals are transmitted to an operational amplifier. The single-chip microcomputer also controls another multi-channel analogue signal switch to regulate the amplifier gain of the operational amplifier. The conditioned signals are transmitted to an A/D conversion circuit for analog-to-digital conversion after being conditioned by the operational amplifier. The signals of different types of sample objects can be conveniently conditioned through the low-price analogue switches, and therefore the high-price operational amplifier is less used. The amplifier gain which is controllable leads to a greater variation degree of a sample range, the universality of the circuit is improved, and difficulty in subsequent circuit design and device type selection is decreased. A signal conditioning part is characterized by repeated superposition, and therefore the circuit can at most realize all input signal sampling of three channels.
Description
Technical field
The utility model relates to a kind of sample circuit, particularly a kind of recording instrument without paper table sample circuit.
Background technology
Along with the continuous intensification of automaticity in the process industry, the user continues to increase the supervision of procedure parameter, the demand of control.Recording instrument without paper be widely used in industries such as electric power, metallurgy, petrochemical industry, light textile, food, medicine, and the signal sample circuit in the recording instrument without paper directly has influence on the performance of registering instrument as the data record unit of whole process.
Often to the sensor specialized designs of independent kind, versatility is not high, and can only realize the sampling function of single passage for traditional signal sample circuit.
Summary of the invention
The utility model is low to now traditional signal sample circuit versatility; The problem that sampling channel is single has proposed a kind of recording instrument without paper table sample circuit, can switch through Single-chip Controlling to realize same circuit; The coupling all the sensors; And can be extended to maximum three passages, product had be different from the characteristic of like product, increase product competitiveness with this.
The technical scheme of the utility model is: a kind of recording instrument without paper table sample circuit; Three multi-channel analog signal switches of Single-chip Controlling are gathered the various signals at scene; Gather the back signal and send operational amplifier; Single-chip Controlling multi-channel analog signal switch is regulated the amplifier gain of operational amplifier simultaneously, and acquired signal send the A/D change-over circuit to carry out analog to digital conversion after carrying out signal condition through operational amplifier.
The input of the output termination multi-channel analog signal switch of said operational amplifier, the output of multi-channel analog signal switch connect the input of operational amplifier and bear, the amplifier gain of adjustment operational amplifier.
Said multi-channel analog signal switch is selected the CD4051 chip for use.
The beneficial effect of the utility model is: the utility model recording instrument without paper table sample circuit, through the lower analog switch of price, can carry out signal condition to dissimilar samplings to picture easily, and reduced use to the higher operational amplifier of price.The controlled sampling range change degree that makes of amplifier gain increases, and has increased the circuit versatility, has reduced the difficulty of subsequent conditioning circuit design and parts selection.The signal condition part can repeat stack, makes circuit can realize three-channel full input signal sampling at most.
Description of drawings
Fig. 1 is the utility model recording instrument without paper table sample circuit theory diagram;
Fig. 2 is multi-channel analog switch circuit figure in the utility model recording instrument without paper table sample circuit;
Fig. 3 is a controlled gain amplifier circuit diagram in the utility model recording instrument without paper table sample circuit;
Fig. 4 is A/D change-over circuit figure in the utility model recording instrument without paper table sample circuit.
Embodiment
Recording instrument without paper table sample circuit theory diagram as shown in Figure 1; 1,2,3 pairs of on-site signals of single-chip microcomputer 5 three multi-channel analog signal switches of control are gathered; Gather the back signal and send operational amplifier; Single-chip microcomputer 5 control multi-channel analog signal switches 7 are regulated the amplifier gain of operational amplifier 4 simultaneously, and acquired signal send A/D change-over circuit 6 to carry out analog to digital conversion after carrying out signal condition through operational amplifier 4.Multi-channel analog switch circuit figure as shown in Figure 2 selects CD4051 octuple analog switch chip here for use, and acquired signal is sent into from the IN1A end; Controlled gain amplifier circuit diagram as shown in Figure 3, output 6 pin of operational amplifier 4 connect the input of multi-channel analog signal switch 7, and the output of multi-channel analog signal switch 7 connects the input of operational amplifier 4 and bears, the amplifier gain of adjustment operational amplifier 4; A/D change-over circuit figure as shown in Figure 4.
Through Single-chip Controlling analog switch switch sampling type and passage, it is suitable that gain amplifier matees to select simultaneously, obtains the corresponding code value of current voltage by the A/D conversion chip at last.Through the lower analog switch of price, can carry out signal condition to dissimilar samplings to picture easily, reduced use to the higher operational amplifier of price.Simultaneously, the controlled sampling range change degree that makes of amplifier gain increases, and has increased the circuit versatility, has reduced the difficulty of subsequent conditioning circuit design and parts selection.Select through the suitable filters parameter, realize the balance of stronger interference inhibition and step signal response.Through rational PCB topological design the stability of circuit and anti-harassing and wrecking ability are improved greatly at last.
To different industry spot signals, designed the sample circuit of polytype signal inputs such as ability compatibility standard voltage, normalized current, thermal resistance, thermopair.The circuit versatility is high, can conveniently be transplanted in the instrument of different platform, can realize three-channel full input signal sampling at most.Simultaneously thermal stability is high, can be under 0-50 ℃ of environment operate as normal, nonlinearity erron is less than 0.1%.Through circuit parameter ground choose reasonable, circuit is had under the strong situation about suppressing (power frequency is greater than 55dB) interference, sampling rate is not less than 10 times/second.
Claims (3)
1. recording instrument without paper table sample circuit; It is characterized in that; Three multi-channel analog signal switches of Single-chip Controlling are gathered the various signals at scene, gather the back signal and send operational amplifier, and Single-chip Controlling multi-channel analog signal switch is regulated the amplifier gain of operational amplifier simultaneously; Acquired signal send the A/D change-over circuit to carry out analog to digital conversion after carrying out signal condition through operational amplifier.
2. according to the said recording instrument without paper table of claim 1 sample circuit; It is characterized in that; The input of the output termination multi-channel analog signal switch of said operational amplifier, the output of multi-channel analog signal switch connect the input of operational amplifier and bear, the amplifier gain of adjustment operational amplifier.
3. according to the said recording instrument without paper table of claim 1 sample circuit, it is characterized in that said multi-channel analog signal switch is selected the CD4051 chip for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205653400U CN202533755U (en) | 2011-12-30 | 2011-12-30 | Sampling circuit for paperless recording instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205653400U CN202533755U (en) | 2011-12-30 | 2011-12-30 | Sampling circuit for paperless recording instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202533755U true CN202533755U (en) | 2012-11-14 |
Family
ID=47134926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205653400U Expired - Fee Related CN202533755U (en) | 2011-12-30 | 2011-12-30 | Sampling circuit for paperless recording instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202533755U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597348A (en) * | 2015-01-19 | 2015-05-06 | 浙江中控自动化仪表有限公司 | Method and system for detecting input signal type of universal input end |
| CN111157795A (en) * | 2020-01-21 | 2020-05-15 | 福建顺昌虹润精密仪器有限公司 | Flat paperless recorder |
-
2011
- 2011-12-30 CN CN2011205653400U patent/CN202533755U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597348A (en) * | 2015-01-19 | 2015-05-06 | 浙江中控自动化仪表有限公司 | Method and system for detecting input signal type of universal input end |
| CN104597348B (en) * | 2015-01-19 | 2017-09-12 | 浙江中控自动化仪表有限公司 | A kind of method and system for the input signal types for detecting omnipotent input |
| CN111157795A (en) * | 2020-01-21 | 2020-05-15 | 福建顺昌虹润精密仪器有限公司 | Flat paperless recorder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20141230 |
|
| EXPY | Termination of patent right or utility model |