CN203414093U - Multi-channel analog quantity small signal remote data acquisition device - Google Patents
Multi-channel analog quantity small signal remote data acquisition device Download PDFInfo
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- CN203414093U CN203414093U CN201320531951.2U CN201320531951U CN203414093U CN 203414093 U CN203414093 U CN 203414093U CN 201320531951 U CN201320531951 U CN 201320531951U CN 203414093 U CN203414093 U CN 203414093U
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- data acquisition
- analog quantity
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Abstract
The utility model discloses a multi-channel analog quantity small signal remote data acquisition device. The data acquisition device is characterized in that the data acquisition device is formed by successively connecting a sensor, a summing amplifier, a V/F converter, a photoelectric isolator, a Schmidt shaper and a CPU timing counter in series; the sensor inputs the analog quantity which is acquired on site into the summing amplifier; the analog quantity is amplified and then is input into the V/F converter by the summing amplifier; the V/F converter converts the amplified analog quantity into the corresponding frequency, and a photoelectric isolator arranged on the far end is driven in a current mode; the photoelectric isolator inputs the isolated frequency into the Schmidt shaper; and the isolated frequency is shaped by the Schmidt shaper and then is converted to digital quantity by the CPU timing counter, so that remote data acquisition is realized. Compared with the prior art, the data acquisition device provided by the utility model has the advantages of simple structure, stable performance, reliability, strong anti-interference ability, high precision, good maintainability, low cost and convenient enterprise popularization and application.
Description
Technical field
The utility model relates to technical field of industrial automatic control, specifically a kind of multi-analog small-signal long-distance data acquisition device.
Background technology
In industrial automatic control, the analog quantity of various kinds of sensors output need to be transformed to data volume, these analog quantitys can be voltage or electric current, the intensity of its signal is all more small and weak, if directly or after amplifying send main frame to carry out A/D conversion these analog quantitys, after long-distance transmissions, signal can be decayed and be disturbed.Another method utilizes analog acquisition fastener scene to complete A/D conversion nearby exactly, then digital quantity is sent into main frame via communication line, this mode reliability and accuracy are all better, shortcoming is when analog quantity way is more, required fastener quantity is just many, and cost is higher, these external application communication bus transmission data, main frame needs each input card of poll, can increase the analog acquisition cycle.
Utility model content
The purpose of this utility model is a kind of multi-analog small-signal long-distance data acquisition device designing for the deficiencies in the prior art, adopt V/F conversion and CPU high speed edging trigger technology, analog quantity is converted to data volume and carries out remote data acquisition, simple in structure, stable performance, reliable, antijamming capability is strong, and precision is high, maintainable good, cost is low.
The purpose of this utility model is achieved in that a kind of multi-analog small-signal long-distance data acquisition device, is characterized in that this data collector is composed in series successively by sensor and summing amplifier, V/F converter, photoisolator, Schmidt's reshaper and CPU timer conter; Sensor is by the analog input summing amplifier of collection in worksite, input V/F converter after summing amplifier amplifies analog quantity, V/F converter drives with current system the photoisolator that is arranged on far-end after converting the analog quantity after amplifying to corresponding frequency, photoisolator is by the frequency input Schmidt reshaper after isolation, after the shaping of Schmidt's reshaper, by CPU timer conter, be converted to digital quantity, realize remote data acquisition.
The utility model compared with prior art has simple in structure, stable performance, reliable, and antijamming capability is strong, and precision is high, and maintainable good, cost is low, is convenient to business enterprise expand application.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Embodiment
Consult accompanying drawing 1, the utility model is composed in series successively by sensor 1 and summing amplifier 2, V/F converter 3, photoisolator 4, Schmidt's reshaper 5 and CPU timer conter 6; Sensor 1 is by the analog input summing amplifier 2 of collection in worksite, input V/F converter 3 after summing amplifier 2 amplifies analog quantity, V/F converter 3 drives with current system the photoisolator 4 that is arranged on far-end after converting the analog quantity after amplifying to corresponding frequency, photoisolator 4 is by the frequency input Schmidt reshaper 5 after isolation, after the shaping of Schmidt's reshaper 5, by CPU timer conter 6, be converted to digital quantity, realize remote data acquisition.
To be arranged on the data acquisition embodiment of remote 14 manometric balance bodies, the utility model is described in further detail below.
Embodiment 1
Three TJL-1 S type pressure transducers 1 are set under every platform balance body, and pressure transducer 1 produces high precision 10V by accurate voltage-stabilizing circuit INA125 excitation power supply is provided, and makes every platform balance body with 0 ~ 20mV voltage, input summing amplifier 2 according to different pressures.Summing amplifier 2 will be inputted V/F converter 3 with 0 ~ 1V voltage after 0 ~ 20mV voltage amplification of input.V/F converter 3 converts the analog quantity after amplifying after 0 ~ 100KHZ frequency to, drives the photoisolator 4 that is arranged on far-end (can reach 1500 meters) with current system.Photoisolator 4 adopts 14 road photoelectric isolation modules to carry out photoelectricity isolation to the frequency of analog quantity conversion, the frequency input Schmidt reshaper 5 after photoelectricity isolation.After 5 shapings of Schmidt's reshaper, by CPU timer conter 6 counting and according to the timing ga(u)ge numerical value on each road, by calibration value, calculate the actual weight of pressure transducer 1, realize remote data acquisition.
The utility model application V/F conversion and CPU high speed edging trigger counting technology, be converted to data volume by analog quantity and carry out long-distance transmissions, simple in structure, cost is low, stable, reliable, antijamming capability is strong, maintainable good, makes the performance of enterprises and social benefit reach best.
More than just the utility model is described further, not in order to limit this patent, all is that the utility model equivalence is implemented, within all should being contained in the claim scope of this patent.
Claims (1)
1. a multi-analog small-signal long-distance data acquisition device, is characterized in that this data collector is connected in series and forms successively with summing amplifier (2), V/F converter (3), photoisolator (4), Schmidt's reshaper (5) and CPU timer conter (6) by sensor (1); Sensor (1) is by the analog input summing amplifier (2) of collection in worksite, input V/F converter (3) after summing amplifier (2) amplifies analog quantity, V/F converter (3) drives with current system the photoisolator (4) that is arranged on far-end after converting the analog quantity after amplifying to corresponding frequency, photoisolator (4) is by the frequency input Schmidt's reshaper (5) after isolation, after Schmidt's reshaper (5) shaping, by CPU timer conter (6), be converted to digital quantity, realize remote data acquisition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320531951.2U CN203414093U (en) | 2013-08-29 | 2013-08-29 | Multi-channel analog quantity small signal remote data acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320531951.2U CN203414093U (en) | 2013-08-29 | 2013-08-29 | Multi-channel analog quantity small signal remote data acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203414093U true CN203414093U (en) | 2014-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320531951.2U Expired - Lifetime CN203414093U (en) | 2013-08-29 | 2013-08-29 | Multi-channel analog quantity small signal remote data acquisition device |
Country Status (1)
| Country | Link |
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| CN (1) | CN203414093U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105321334A (en) * | 2014-10-10 | 2016-02-10 | 天津市英贝特航天科技有限公司 | Converting and transmitting method and transmitting structure of analog signals |
-
2013
- 2013-08-29 CN CN201320531951.2U patent/CN203414093U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105321334A (en) * | 2014-10-10 | 2016-02-10 | 天津市英贝特航天科技有限公司 | Converting and transmitting method and transmitting structure of analog signals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140129 |