CN203909542U - Virtual instrument-based general analog quantity measurement and control circuit - Google Patents
Virtual instrument-based general analog quantity measurement and control circuit Download PDFInfo
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- CN203909542U CN203909542U CN201420373532.5U CN201420373532U CN203909542U CN 203909542 U CN203909542 U CN 203909542U CN 201420373532 U CN201420373532 U CN 201420373532U CN 203909542 U CN203909542 U CN 203909542U
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Abstract
The utility model discloses a virtual instrument-based general analog quantity measurement and control circuit. The virtual instrument-based general analog quantity measurement and control circuit includes a multi-channel switch module, an amplification circuit module, a V/F conversion module, a control module, a data transmission circuit module, a key circuit module circuit, a display circuit module, a watchdog circuit and a control quantity output module; the multi-channel switch module receives analog quantity and converts the same into a standard voltage value, and transmits the standard voltage value to the amplification circuit module; the amplification circuit module amplifies analog voltage signals, and transmits the same to the V/F conversion module; the V/F conversion module converts the analog signals into frequency signals, and transmits the frequency signals to the control module; the control module is in communication connection with the data transmission circuit module, the key circuit module and the display circuit module respectively; the signal output end of the watchdog circuit is connected with the control module; and the control module is communication connection with the signal input end of the control quantity output module. The virtual instrument-based general analog quantity measurement and control circuit of the utility model has the advantages of simple structure, convenient operation, small occupation area and low cost, and can satisfy various experimental requirements.
Description
Technical field
The utility model relates to telemetry circuit technical field, relates in particular to a kind of general-purpose simulation based on virtual instrument and measures control circuit.
Background technology
Traditional analog quantity observing and controlling experiment can be subject to the restriction of experimental period, place and experimental provision lazy weight, to teachers and students, bring inconvenience, simultaneously also need a large amount of different experimental facilitiess doing different experiments, experimental teaching unit floor area is large, experiment fees is high, and the existing general-purpose simulation measurement control circuit based on virtual instrument, when doing different analog quantity observing and controlling experiments, only need to change external sensor and load, just can meet experiment demand, and experimentation and experimental result are presented on screen visually.
Summary of the invention
The utility model object is to solve the aforementioned problems in the prior, provide a kind of simple in structure, easy to operate, floor area is little, the general-purpose simulation based on virtual instrument low-cost and that can meet kinds of experiments demand measures control circuit.
The utility model is for achieving the above object, the technological means adopting is, a kind of general-purpose simulation based on virtual instrument measures control circuit, comprise multi-way switch module, amplifying circuit module, V/F modular converter, control module, data transmission circuit module, key circuit module, display circuit module, watchdog circuit and controlled quentity controlled variable output module, described multi-way switch module reception analog quantity converts standard voltage value to and is delivered to amplifying circuit module, amplifying circuit module transfers to V/F modular converter after analog voltage signal is amplified, V/F modular converter converts analog electrical signal to frequency signal and transfers to control module, control module respectively with data transmission circuit module, key circuit module and display circuit module communication connection, the signal output part of watchdog circuit is connected with control module, the signal input part communication connection of control module and controlled quentity controlled variable output module.
Further, described amplifying circuit module comprises accurate differential amplifier circuit and programme-controlled gain amplifying circuit.
Further, described control module adopts AT89C52 single-chip microcomputer.
Further, described V/F modular converter adopts LM331 integrated circuit.
Further, described data transmission circuit module adopts RS-485 serial interface bus circuit.
Further, described controlled quentity controlled variable output module adopts ULN2003 integrated drive chips.
The utility model beneficial effect is: simple in structure, easy to operate, general-purpose simulation measures control circuit and can the common analog quantitys such as temperature, flow, pressure be measured and be controlled by external different sensor, has measurements, control accuracy is high, tests connection easy; When doing different analog quantity observing and controlling experiments, only need to change external sensor and load, just can meet experiment demand.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the utility model circuit theory diagrams.
Fig. 2 is accurate differential amplifier circuit schematic diagram in the utility model.
Fig. 3 is V/F modular converter wiring diagram in the utility model.
Fig. 4 is button elementary diagram in the utility model.
Embodiment
A kind of general-purpose simulation based on virtual instrument as shown in Figure 1 measures control circuit, comprise multi-way switch module, amplifying circuit module, V/F modular converter, control module, data transmission circuit module, key circuit module, display circuit module, watchdog circuit and controlled quentity controlled variable output module, described multi-way switch module reception analog quantity converts standard voltage value to and is delivered to amplifying circuit module, amplifying circuit module transfers to V/F modular converter after analog voltage signal is amplified, V/F modular converter converts analog electrical signal to frequency signal and transfers to control module, control module respectively with data transmission circuit module, key circuit module and display circuit module communication connection, the signal output part of watchdog circuit is connected with control module, the signal input part communication connection of control module and controlled quentity controlled variable output module.
Described amplifying circuit module comprises accurate differential amplifier circuit and programme-controlled gain amplifying circuit.
Described control module adopts AT89C52 single-chip microcomputer.
Described V/F modular converter adopts LM331 integrated circuit.
Described data transmission circuit module adopts RS-485 serial interface bus circuit.
Described controlled quentity controlled variable output module adopts ULN2003 integrated drive chips.
Multi-way switch module adopts two CD4052 binary channels four path analoging switch to receive analog quantity, and convert standard voltage value to and be delivered to accurate differential amplifier circuit, as shown in Figure 2, accurate differential amplifier circuit adopts three integrated transporting discharging OP07 assemblings, wherein A1 is two integrated transporting discharging OP07 that performance is consistent with A2, work in homophase and amplify mode, form the differential amplification input stage of balanced, symmetrical, A3 still adopts OP07, be used for further suppressing A1, the common-mode signal of A2, and be connected into the needs that Single-end output mode adapts to ground connection load, for make accurate differential amplifier circuit output can with the Input matching of V/F modular converter thereafter, the input voltage that need make accurate differential amplifier circuit is zero or is positive signal, and when switching multichannel die change plan switch module makes accurate differential amplifier circuit input end grounding carry out drift test, in operating ambient temperature range, should make accurate differential amplifier circuit be output as zero or negative, this just can realize by the zero potentiometer Rw in adjustment precision differential amplifier circuit, can also before accurate differential amplifier circuit, add second-order low-pass filter, further being used for overcoming signal disturbs.
Accurate differential amplifier circuit amplifying signal is transferred to programme-controlled gain amplifying circuit, when external different sensor, the variation range of signal is different, in order to guarantee measuring accuracy, the normal mode that changes range that adopts, while changing range, the gain of gain amplifying circuit is correspondingly change also, so that the analog voltage of gain amplifying circuit output is suitable for the voltage range of V/F modular converter, programme-controlled gain amplifying circuit can make the precision of converter utilize to greatest extent, reduce measuring error, realize the automatic switchover of range, realize the homogenization of gamut, programme-controlled gain amplifying circuit amplifying signal is transferred to V/F modular converter, V/F modular converter adopts LM331 integrated circuit, as shown in Figure 3, because external signal comes from different objects conventionally, for the low level signal under high common mode voltage, must take conversion and the isolation of corresponding measure settling signal, and the isolation of V/F modular converter and photoelectricity analog input can be converted to frequency signal processes be simulating signal conversion and isolation.V/F modular converter converts analog electrical signal to frequency signal and transfers to control module, control module is selected AT89C52 single-chip microcomputer, carry out collection and the data transmission circuit module of analog quantity and carry out exchanges data, data transmission circuit module adopts RS-485 serial interface bus circuit, RS-485 adopts balance to send and realizes and communicating by letter with differential received mode, at transmitting terminal driver, convert Transistor-Transistor Logic level signal to differential signal output, at receiving terminal receiver, differential signal is reduced into TTL signal, can there is so very strong anti-common mode interference ability and very high receiving sensitivity.Key circuit module is connected with single chip communication and can inputs data to single-chip microcomputer, and as shown in Figure 4, key circuit module adopts matrix keyboard interface, can effectively solve a plurality of mouthfuls of lines; Display circuit module is connected with single chip communication, and display circuit module adopts SI PO shift register 74LS164 to control charactron demonstration.The signal input part communication connection of single-chip microcomputer and controlled quentity controlled variable output module, controlled quentity controlled variable output module adopts ULN2003 integrated drive chips, can drive conventional light-emitting diode display.
Should by external different sensor, can measure and Based Intelligent Control common analog quantitys such as temperature, flow, pressure by the general-purpose simulation measurement control circuit based on virtual instrument, there is measurement, control accuracy is high, experiment connects easy, and has the plurality of advantages of virtual instrument; Student can select different control algolithms in experiment, by computer screen, intuitively observe the variation of controlled volume in whole control procedure, grasp the thought of control theory, abstract concept and concrete practical application are combined, make study reach the effect of getting twice the result with half the effort.
The above; be only embodiment of the present utility model, be not limited to this, be anyly familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, within all should being encompassed in protection domain of the present utility model.
Claims (6)
1. the general-purpose simulation based on virtual instrument measures control circuit, it is characterized in that: comprise multi-way switch module, amplifying circuit module, V/F modular converter, control module, data transmission circuit module, key circuit module, display circuit module, watchdog circuit and controlled quentity controlled variable output module, described multi-way switch module reception analog quantity converts standard voltage value to and is delivered to amplifying circuit module, described amplifying circuit module transfers to V/F modular converter after analog voltage signal is amplified, described V/F modular converter converts analog electrical signal to frequency signal and transfers to control module, described control module respectively with data transmission circuit module, key circuit module and display circuit module communication connection, the signal output part of described watchdog circuit is connected with control module, the signal input part communication connection of described control module and controlled quentity controlled variable output module.
2. the general-purpose simulation based on virtual instrument according to claim 1 measures control circuit, it is characterized in that: described amplifying circuit module comprises accurate differential amplifier circuit and programme-controlled gain amplifying circuit.
3. the general-purpose simulation based on virtual instrument according to claim 1 measures control circuit, it is characterized in that: described control module adopts AT89C52 single-chip microcomputer.
4. the general-purpose simulation based on virtual instrument according to claim 1 measures control circuit, it is characterized in that: described V/F modular converter adopts LM331 integrated circuit.
5. the general-purpose simulation based on virtual instrument according to claim 1 measures control circuit, it is characterized in that: described data transmission circuit module adopts RS-485 serial interface bus circuit.
6. the general-purpose simulation based on virtual instrument according to claim 1 measures control circuit, it is characterized in that: described controlled quentity controlled variable output module adopts ULN2003 integrated drive chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420373532.5U CN203909542U (en) | 2014-06-30 | 2014-06-30 | Virtual instrument-based general analog quantity measurement and control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420373532.5U CN203909542U (en) | 2014-06-30 | 2014-06-30 | Virtual instrument-based general analog quantity measurement and control circuit |
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| CN203909542U true CN203909542U (en) | 2014-10-29 |
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| CN201420373532.5U Expired - Fee Related CN203909542U (en) | 2014-06-30 | 2014-06-30 | Virtual instrument-based general analog quantity measurement and control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106020070A (en) * | 2016-07-29 | 2016-10-12 | 苏州博众精工科技有限公司 | Novel analog signal amplifier |
| CN111367219A (en) * | 2020-03-20 | 2020-07-03 | 上海航天计算机技术研究所 | Carrier rocket differential mode transmitter based on PCI bus |
-
2014
- 2014-06-30 CN CN201420373532.5U patent/CN203909542U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106020070A (en) * | 2016-07-29 | 2016-10-12 | 苏州博众精工科技有限公司 | Novel analog signal amplifier |
| CN106020070B (en) * | 2016-07-29 | 2018-12-28 | 博众精工科技股份有限公司 | A kind of novel analog signal amplifier |
| CN111367219A (en) * | 2020-03-20 | 2020-07-03 | 上海航天计算机技术研究所 | Carrier rocket differential mode transmitter based on PCI bus |
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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 |
Granted publication date: 20141029 Termination date: 20150630 |
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| EXPY | Termination of patent right or utility model |