CN203642872U - Strain measurement board card based on PXI bus - Google Patents
Strain measurement board card based on PXI bus Download PDFInfo
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- CN203642872U CN203642872U CN201320833245.3U CN201320833245U CN203642872U CN 203642872 U CN203642872 U CN 203642872U CN 201320833245 U CN201320833245 U CN 201320833245U CN 203642872 U CN203642872 U CN 203642872U
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Abstract
Provided is a strain measurement board card based on PXI bus. The strain measurement board card comprises an FPGA circuit module, an input module, a DSP circuit module, a DA conversion circuit module, a data bus conversion circuit module and an output module. The input module, the DSP circuit module, the DA conversion circuit module, the data bus conversion circuit module and the output module are connected with the FPGA circuit module. The input end of the input circuit is connected with a strain sensor. The output end of the DA conversion circuit module is connected with the input module. The output end of the FPGA circuit module is connected with the output module. The output end of the output module is connected with the strain sensor. The output end of the data bus conversion circuit module is in bridge connection with a PXI bus interface circuit module. The PXI bus interface circuit module is connected with an upper computer. The strain measurement board card has high measurement precision, rapid sampling speed, and high real-time analysis and processing capabilities of measurement signals, can adjust bridge balance automatically, and can meet strain measurement requirements of different strain sensors in different fields. The included output module can achieve power supply for strain sensors with different specifications, and the complexity of the circuit system is lowered.
Description
Technical field:
The utility model relates to strain measurement field, particularly a kind of strain measurement board based on PXI bus.
Background technology:
PXI is a kind of framework of adding some distinctive signals compositions taking PCI and CompactPCI as basis.It has that processing capability in real time is strong, transmission speed is fast and the feature such as scalability is good, is applicable to test, measurement and data acquisition applications, has been widely used at present thermometrically field.Strain is that physical construction is measured and an important parameter of analyzing, when object is out of shape due to external cause (stressed, humidity, change of temperature field etc.), in object, between each several part, produce interactional internal force, to resist the effect of this external cause, and try hard to make the position of object from distortion to be returned to the position before distortion.It has reflected that object is subject to External Force Acting to cause profile and change in size.Strain measurement is widely used in the stress-strain measurement of heavy construction structure, especially in fields such as national defence, chemical industry, civil construction, traffic.
Some strain measurement systems at present, measuring accuracy is low, sampling rate is slow, can not be real-time to measuring measuring-signal analysis and processing, can not meet the strain measurement demand to differently strained sensor in different field, simultaneously, some relate to the measuring system of different size strain transducer, the needed power supply of strain transducer is not of uniform size, needs multiple power sources circuit for it, causes Circuits System complexity.
Utility model content:
The utility model provides a kind of strain measurement board based on PXI bus.To solve some strain measurement systems in prior art, measuring accuracy is low, and sampling rate is slow, can not be real-time to measuring-signal analysis and processing, can not meet the technical matters of the strain measurement demand to differently strained sensor in different field.
Concrete technical scheme of the present utility model is as follows:
A kind of strain measurement board based on PXI bus, comprise FPGA circuit module and the load module being connected with FPGA circuit module respectively, DSP circuit module, DA change-over circuit module, data bus change-over circuit module, output module, the input end of load module is connected with strain transducer, the output terminal of DA change-over circuit module connects load module, the output terminal of FPGA circuit module connects output module, output module output terminal connects strain transducer, data bus change-over circuit module output terminal bridge joint PXI bus interface circuit module, PXI bus interface circuit module connects host computer.
Preferably, described load module comprises the interface circuit unit, signal conditioning circuit unit and the A/D convertor circuit unit that connect successively, interface circuit unit input end connects strain transducer, signal conditioning circuit unit connects the output terminal of DA change-over circuit module, and A/D convertor circuit unit output terminal connects FPGA circuit module.
Preferably, described output module comprises bridge voltage protection circuit unit and connected voltage selecting circuit unit, and bridge voltage protection circuit unit input end connects FPGA circuit module, and voltage selecting circuit unit output terminal connects strain transducer.
Preferably, described data bus change-over circuit module adopts PCI9054 chip.
Preferably, described A/D convertor circuit unit adopts 24 AD chip AD7766 of high-precision low-power consumption.
Preferably, described DA change-over circuit module adopts high precision DA chip DAC8653.
Preferably, described FPGA circuit module adopts Span3E family chip.
Preferably, described DSP circuit module adopts 6000 series DSP chips.
The beneficial effect of the strain measurement board based on PXI bus described in the utility model is as follows:
1, the strain measurement board measuring accuracy based on PXI bus of the present utility model is high, sampling rate is fast, can automatically regulate bridge balance, and measuring-signal real-time analysis and processing power are strong, applied range, can meet the strain measurement demand of differently strained sensor in different field;
2, the output module that the utility model comprises can be realized the strain transducer power supply of different size, has reduced the complexity of Circuits System;
3, the utility model, on the basis of DSP+FPGA framework, in conjunction with bus switching circuit and PXI bus interface circuit module, utilizes the resource of host computer, and a kind of man-machine interaction close friend's PXI strain measurement board is provided.
Brief description of the drawings:
Further illustrate the utility model below in conjunction with the drawings and specific embodiments.
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is load module structured flowchart of the present utility model;
Fig. 3 is output module structured flowchart of the present utility model.
Embodiment:
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
As Figure 1-3, a kind of strain measurement board based on PXI bus, comprise FPGA circuit module 1 and the load module 2 being connected with FPGA circuit module 1 respectively, DSP circuit module 3, DA change-over circuit module 4, data bus change-over circuit module 5 and output module 7, the input end of load module 2 is connected with strain transducer 6, the output terminal of DA change-over circuit module 4 connects load module 2, the output terminal of FPGA circuit module 1 connects output module 7, output module 7 output terminals connect strain transducer 6, data bus change-over circuit module 5 output terminal bridge joint PXI bus interface circuit modules 8, PXI bus interface circuit module 8 connects host computer 9.
Described load module 2 comprises the interface circuit unit 21, signal conditioning circuit unit 22 and the A/D convertor circuit unit 23 that connect successively.Interface circuit unit 21 input ends connect strain transducer 6, and signal conditioning circuit unit 22 connects the output terminal of DA change-over circuit module 4, and A/D convertor circuit unit 23 output terminals connect FPGA circuit module 1.Load module 2 is mainly used in realizing collection and the conditioning of various strain transducer 6 input signals.Wherein, coupling and the signals collecting of multiple differently strained sensor 6 can be realized in interface circuit unit 21; Filtering and the gain conditioning of signal mainly realized in signal conditioning circuit unit 22, adopts high-accuracy amplifier chip; Simulating signal is converted to digital signal by A/D convertor circuit unit 23, is transferred to FPGA circuit module 1.
Described output module 7 comprises bridge voltage protection circuit unit 71 and connected voltage selecting circuit unit 72.Bridge voltage protection circuit unit 71 input ends connect FPGA circuit module 1, and voltage selecting circuit unit 72 output terminals connect strain transducer 6.Output module 7 is mainly the strain transducer 6 of different size and powers.Wherein, the electric current on 71 main Dui Qiao roads, bridge voltage protection circuit unit is monitored, and prevents that electric current is excessive; Voltage selecting circuit unit 72 is main according to the specification of strain transducer 6, exports different DC voltage, as the power supply of strain transducer 6.
Described DA change-over circuit module 4 is mainly made up of DA conversion chip and peripheral circuit thereof.DSP will calculate the unbalanced compensated digital signal value of electric bridge and pass to FPGA, FPGA converts digital compensation signal to simulating signal by DA change-over circuit module 4, this simulating signal is delivered to the signal conditioning circuit unit 22 of load module 2, makes bridge voltage balance.
Described FPGA circuit module 1 mainly comprises load module control module, DA change-over circuit control module, output circuit control module, DSP communication unit and data bus change-over circuit communication unit.FPGA circuit module 1 is for realizing the control able to programme of strain measurement.
Described DSP circuit module 3 comprises real-time signal analysis unit and processing unit, mainly digital signal is processed and computing in real time.
Described data bus change-over circuit module 5 comprises bus conversion chip, by bus conversion chip, can realize the conversion of PXI bus interface circuit module 8 and data bus.
Enforcement principle of the present utility model is:
The signal input of strain transducer 6, first pass through load module 2, load module 2 pair of strain sensors 6 signals carry out Signal Matching and conditioning, and the signal after conditioning is through A/D convertor circuit unit 23, convert thereof into digital signal, pass to DSP circuit module 3 through FPGA circuit module 1; DSP circuit module 3 is to initial measuring-signal analysis, judges the whether balance of electric bridge of strain transducer 6, if uneven, by DA change-over circuit module, bucking voltage fed back to signal conditioning circuit unit 22, realizes bridge balance; Data after FPGA circuit module 1 is changed A/D convertor circuit unit 23 pass to DSP circuit module 3 and carry out data-signal processing and analyze, DSP circuit module 3 is by result process FPGA circuit module 1 after treatment and data bus change-over circuit module 5, pass to PXI bus interface circuit module 8, finally pass to host computer 9 by PXI bus interface circuit module 8; Host computer 9, according to the signal of PXI bus interface circuit module 8, shows and on-line analysis in real time to strain measurement result.In addition, FPGA circuit module 1, according to the specification of strain transducer 6, is exported the power supply of multiple DC voltage as strain transducer 6.
In the present embodiment, A/D convertor circuit unit 23 adopts high-precision low-power consumption AD chip AD7766,24 of data bitss, and signal to noise ratio (S/N ratio) is high, and sampling rate reaches as high as 125ksps, has fully met the signals collecting requirement in strain measurement field; FPGA circuit module 1 adopts Span3E family chip; DSP circuit module 3 adopts 6000 series DSP chips, and dominant frequency is high to 300MHz, can fully meet real-time signal analysis processing and the demand for control in strain measurement field; In bus switching circuit module 5, adopt bus conversion chip PCI9054; The conversion chip of DA change-over circuit control module adopts DAC8653,16 of data bitss, and slewing rate is fast, precision is high; In output module 7, bridge voltage protection circuit unit 71 adopts current monitoring INA138 chip.
Comprehensive above structure of the present utility model and principle are known, strain measurement board measuring accuracy based on PXI bus of the present utility model is high, sampling rate is fast, can automatically regulate bridge balance, measuring-signal real-time analysis and processing power are strong, applied range, can meet the strain measurement demand of differently strained sensor in different field; The output module that the utility model comprises can be realized the strain transducer power supply of different size, has reduced the complexity of Circuits System; Meanwhile, the utility model, on the basis of DSP+FPGA framework, in conjunction with bus switching circuit and PXI bus interface circuit module, utilizes the resource of host computer, and a kind of man-machine interaction close friend's PXI strain measurement board is provided.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (8)
1. the strain measurement board based on PXI bus, it is characterized in that, comprise FPGA circuit module and the load module being connected with FPGA circuit module respectively, DSP circuit module, DA change-over circuit module, data bus change-over circuit module, output module, the input end of load module is connected with strain transducer, the output terminal of DA change-over circuit module connects load module, the output terminal of FPGA circuit module connects output module, output module output terminal connects strain transducer, data bus change-over circuit module output terminal bridge joint PXI bus interface circuit module, PXI bus interface circuit module connects host computer.
2. according to the strain measurement board based on PXI bus of claim 1, it is characterized in that, described load module comprises the interface circuit unit, signal conditioning circuit unit and the A/D convertor circuit unit that connect successively, interface circuit unit input end connects strain transducer, signal conditioning circuit unit connects the output terminal of DA change-over circuit module, and A/D convertor circuit unit output terminal connects FPGA circuit module.
3. according to the strain measurement board based on PXI bus of claim 1 or 2; it is characterized in that; described output module comprises bridge voltage protection circuit unit and connected voltage selecting circuit unit; bridge voltage protection circuit unit input end connects FPGA circuit module, and voltage selecting circuit unit output terminal connects strain transducer.
4. according to the strain measurement board based on PXI bus of claim 1, it is characterized in that, described data bus change-over circuit module adopts PCI9054 chip.
5. according to the strain measurement board based on PXI bus of claim 2, it is characterized in that, described A/D convertor circuit unit adopts 24 AD chip AD7766 of high-precision low-power consumption.
6. according to the strain measurement board based on PXI bus of claim 1, it is characterized in that, described DA change-over circuit module adopts high precision DA chip DAC8653.
7. according to the strain measurement board based on PXI bus of claim 1, it is characterized in that, described FPGA circuit module adopts Span3E family chip.
8. according to the strain measurement board based on PXI bus of claim 1, it is characterized in that, described DSP circuit module adopts 6000 series DSP chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320833245.3U CN203642872U (en) | 2013-12-17 | 2013-12-17 | Strain measurement board card based on PXI bus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320833245.3U CN203642872U (en) | 2013-12-17 | 2013-12-17 | Strain measurement board card based on PXI bus |
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| CN203642872U true CN203642872U (en) | 2014-06-11 |
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| CN201320833245.3U Expired - Fee Related CN203642872U (en) | 2013-12-17 | 2013-12-17 | Strain measurement board card based on PXI bus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445620A (en) * | 2015-11-27 | 2016-03-30 | 云南电网有限责任公司电力科学研究院 | High voltage output device and method for feed line automation test |
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2013
- 2013-12-17 CN CN201320833245.3U patent/CN203642872U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445620A (en) * | 2015-11-27 | 2016-03-30 | 云南电网有限责任公司电力科学研究院 | High voltage output device and method for feed line automation test |
| CN105445620B (en) * | 2015-11-27 | 2018-05-01 | 云南电网有限责任公司电力科学研究院 | A kind of High voltage output device and method for feeder automation tester |
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Granted publication date: 20140611 |