CN208224805U - Fast Multi-channel Data Collection Circuit - Google Patents
Fast Multi-channel Data Collection Circuit Download PDFInfo
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- CN208224805U CN208224805U CN201820926137.3U CN201820926137U CN208224805U CN 208224805 U CN208224805 U CN 208224805U CN 201820926137 U CN201820926137 U CN 201820926137U CN 208224805 U CN208224805 U CN 208224805U
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Abstract
The utility model discloses a kind of Fast Multi-channel Data Collection Circuits, and including the conditioning circuit for receiving multiple channel datas, conditioning circuit is connected to analog to digital conversion circuit, and analog to digital conversion circuit connects FPGA data processing unit；Wherein analog to digital conversion circuit includes ADS1672 chip and crystal oscillator, and crystal oscillator is connected to ADS1672 chip by clock buffer circuit；The utility model can be improved the hardware performance of part of data acquisition during vibration analysis, and accuracy is high, can satisfy the accurate acquisition demand of high revolving speed, high failure-frequency and its frequency multiplication, thus accurate judgement of the safeguards technique personnel for failure.
Description
Technical field
The utility model belongs to high--speed multi--channel data acquisition analysis technical field, specifically, being a kind of high speed multi-pass
Track data Acquisition Circuit.
Background technique
During the vibration monitoring of certain helicopter, the AD data of synchronous high-speed acquisition multichannel are needed, and to each port number
According to a large amount of data analysis is carried out simultaneously and in real time, to reach, calculating technical staff may be used to determine guilty culprit in real time
And the quantity of parameters and analysis information of severity.At present common scheme be data acquisition is carried out using ADS1271, thus
Realize the function of vibration monitoring, as shown in Figure 1；Since ADS1271 chip the maximum data rate is 105469SPS, that is, using should
Chip realizes that the hardware system highest sample rate of data acquisition function can only achieve 100k, according to Nyquist law, in 100K
Sample rate under, highest failure-frequency which can analyze is 50k.In the vibration for being directed to certain high revolving speed turboshaft engine
In monitoring, it has been found that the engine highest meshing frequency under maximum (top) speed is 28500HZ, highest blade passing frequency
It at least needs to collect 3 frequencys multiplication of highest failure-frequency in actual fault diagnosis for 30750HZ, therefore is directed to the high revolving speed
The vibration monitoring of turboshaft engine, the highest frequency for needing to analyze are 30750HZ*3, i.e. 92.25k, that is to say, that at least need
The sample rate for reaching 200k just can satisfy the vibration monitoring demand of the turboshaft engine, and traditional implementation is uncomfortable
With the omission for high failure-frequency and its frequency multiplication being be easy to cause, thus erroneous judgement of the influence technique personnel for failure.
If to go straight up to Bigpian and gear distress prominent for China's type, flight safety is influenced, the reliable vibration in real time of development is badly in need of
Monitoring device much can just alarm in time of failure point in advance, great accident is avoided to occur.Because the whirlpool axis starts
The high revolving speed reason of machine itself not only needs to be acquired place to the data of multichannel simultaneously for the vibration monitoring of the engine
Reason and analysis, and need the hardware acquisition scheme of high sampling rate, to guarantee for high revolving speed, high failure-frequency and its frequency multiplication
Accurate acquisition, thus accurate judgement of the safeguards technique personnel for failure.
In view of this, special propose the utility model.
Utility model content
The utility model to solve above-mentioned deficiency of the prior art provides a kind of Fast Multi-channel Data Collection Circuit,
Improve acquisition, analyzing and processing data performance.
In order to solve the above technical problems, the basic idea of the utility model adopting the technical scheme is:
A kind of Fast Multi-channel Data Collection Circuit, including the conditioning circuit for receiving multiple channel datas, conditioning electricity
Road connects multiple data transmission channels to analog to digital conversion circuit, and analog to digital conversion circuit connects FPGA data processing unit；Wherein mould
Number conversion circuit includes ADS1672 chip, and crystal oscillator is connected to ADS1672 chip by clock buffer circuit.
Further, in above-mentioned Fast Multi-channel Data Collection Circuit: the FPGA data processing unit is equipped with AD core
Piece rate configuration module and over-voltage detection unit, the ADS1672 chip by pin respectively with the over-voltage detection unit and
The connection of A/D chip rate configuration module.
Further, in above-mentioned Fast Multi-channel Data Collection Circuit: FPGA data processing unit and ADS1672 chip
It is connected by spi bus.
Further, in above-mentioned Fast Multi-channel Data Collection Circuit: the conditioning circuit is fully differential conditioning circuit.
Further, in above-mentioned Fast Multi-channel Data Collection Circuit: the oscillation frequency of the crystal oscillator is
13.1072MHZ。
Further, in above-mentioned Fast Multi-channel Data Collection Circuit: the ADS1672 chip is connected with reference voltage
Chip is to obtain 3V reference voltage.
After adopting the above technical scheme, the utility model has the advantages that compared with prior art
The Fast Multi-channel Data Collection Circuit that the utility model technology provides, data acquire during improving vibration analysis
Partial hardware performance, accuracy is high, can satisfy the accurate acquisition demand of high revolving speed, high failure-frequency and its frequency multiplication, thus
Accurate judgement of the safeguards technique personnel for failure.
Detailed description of the invention
Fig. 1 is vibration monitoring data acquisition circuit structural block diagram in the prior art；
Fig. 2 is the structural block diagram of Fast Multi-channel Data Collection Circuit provided by the utility model；
Fig. 3 is the data acquisition flow figure of Fast Multi-channel Data Collection Circuit shown in Fig. 2；
Specific embodiment
Utility model will be further explained below with reference to the attached drawings and specific embodiments, to help understanding that this is practical new
The content of type.
As shown in Fig. 2, a kind of Fast Multi-channel Data Collection Circuit, including the conditioning electricity for receiving multiple channel datas
Road, conditioning circuit connect multiple data transmission channels to analog to digital conversion circuit, and it is single that analog to digital conversion circuit connects FPGA data processing
Member.
Wherein analog to digital conversion circuit includes ADS1672 chip, and ADS1672 chip provides the base of 3V by reference voltage chip
Quasi- voltage；Crystal oscillator is connected to ADS1672 chip by clock buffer circuit；ADS1672 chip possesses very outstanding AC
With DC performance, high speed, high resolution, the maximum data rate up to 625KSPS, want by the data acquisition for meeting 200K sample rate enough
It asks；According to the databook of ADS1672, in order to accurately realize and be compatible with following four 25.6k, 51.2k, 102.4k,
The sample rate of 204.8k, the application uses frequency of oscillation for the crystal oscillator of 13.1072MHZ, and passes through clock buffer circuit
ADS1672 chip is connected, to guarantee realization analog to digital conversion circuit highest sample rate for the data acquisition request of 204.8k, completely
Foot carries out the vibration detection of failure-frequency to high revolving speed turboshaft engine vibrating data collection, improves to the accurate of breakdown judge
Property.
The specific embodiment that the utility model provides are as follows:
The conditioning circuit is fully differential conditioning circuit for connecting acceleration transducer；The letter of acceleration transducer acquisition
Number by 6 tunnel data transports to fully differential conditioning circuit, fully differential conditioning circuit improve be AD conversion signal wants
It asks, then is transmitted to ADS1672 chip by 6 data transmission channels.The FPGA data processing unit is based on fpga chip, and
Equipped with A/D chip rate configuration module and over-voltage detection unit, on the one hand fpga chip connects ADS1672 chip by spi bus
To read the data of ADS1672 chip and carry out FIFO caching, eventually by bus transfer into the processor for needing the data；
For another aspect fpga chip by A/D chip rate configuration module, 0/1 pin of DRATE through ADS1672 chip realizes that dynamic is real
When change ADS1672 chip sample rate function, over-voltage detection unit is carried out real-time by the OTRD pin of ADS1672 chip
Over-voltage detection, to prevent vibrating the excessive analysis for causing over-voltage and influencing final data.
As shown in Figure 3, the process of entire data acquisition are as follows: AD acquisition is in halted state, when fpga chip receives phase
After the AD acquisition sign on for closing processor, fpga chip carries out AD configuration (completion of A/D chip rate configuration module) and enables
ADS1672 chip, ADS1672 chip just start to be AD converted the signal of the multiple data transmission channels received, work as AD
After converting, fpga chip is read current AD conversion value in fpga chip from ADS1672 chip using spi bus
And FIFO is written and carries out data buffer storage, which repeats always, after collecting sufficient amount AD data, closes ADS1672 core
Piece stops entire collection process, and so far primary complete data acquisition just leaves it at that.
Above-mentioned fully differential conditioning circuit preferably uses present utility model application people in Patent No. in the utility model
It is applied to the fully differential signal conditioning circuit of current excitation sensor disclosed in CN201620719417.8, using fully differential side
Formula, any a part can effectively be inhibited by noise jamming on signal transmission path, and can increase pair
The immunity to interference of external noise so that dynamic range be doubled, and reduces even-order harmonic.
The Fast Multi-channel Data Collection Circuit that the utility model technology provides, can be improved data during vibration analysis
The hardware performance of collecting part, accuracy is high, can satisfy the accurate acquisition demand of high revolving speed, high failure-frequency and its frequency multiplication,
To which safeguards technique personnel are for the accurate judgement of failure.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (6)
1. a kind of Fast Multi-channel Data Collection Circuit, it is characterised in that: including the conditioning electricity for receiving multiple channel datas
Road, conditioning circuit are connected to analog to digital conversion circuit, and analog to digital conversion circuit connects FPGA data processing unit；Wherein analog-to-digital conversion electricity
Road includes ADS1672 chip and crystal oscillator, and crystal oscillator is connected to ADS1672 chip by clock buffer circuit.
2. Fast Multi-channel Data Collection Circuit according to claim 1, it is characterised in that: the FPGA data processing is single
Member is based on fpga chip, is equipped with A/D chip rate configuration module and over-voltage detection unit, and the ADS1672 chip passes through pin point
It is not connect with the over-voltage detection unit and A/D chip rate configuration module.
3. Fast Multi-channel Data Collection Circuit according to claim 2, it is characterised in that: FPGA data processing unit with
ADS1672 chip is connected by spi bus.
4. Fast Multi-channel Data Collection Circuit according to claim 1, it is characterised in that: the conditioning circuit is complete poor
Divide conditioning circuit.
5. Fast Multi-channel Data Collection Circuit according to claim 1, it is characterised in that: the shake of the crystal oscillator
Swinging frequency is 13.1072MHZ.
6. Fast Multi-channel Data Collection Circuit according to claim 1, it is characterised in that: the ADS1672 chip connects
Reference voltage chip is connected to obtain 3V reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820926137.3U CN208224805U (en) | 2018-06-14 | 2018-06-14 | Fast Multi-channel Data Collection Circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820926137.3U CN208224805U (en) | 2018-06-14 | 2018-06-14 | Fast Multi-channel Data Collection Circuit |
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| Publication Number | Publication Date |
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| CN208224805U true CN208224805U (en) | 2018-12-11 |
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| CN201820926137.3U Active CN208224805U (en) | 2018-06-14 | 2018-06-14 | Fast Multi-channel Data Collection Circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006426A (en) * | 2019-05-09 | 2019-07-12 | 保定开拓精密仪器制造有限责任公司 | Multichannel accelerometer data acquisition system and acquisition method based on FPGA |
-
2018
- 2018-06-14 CN CN201820926137.3U patent/CN208224805U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006426A (en) * | 2019-05-09 | 2019-07-12 | 保定开拓精密仪器制造有限责任公司 | Multichannel accelerometer data acquisition system and acquisition method based on FPGA |
| CN110006426B (en) * | 2019-05-09 | 2023-03-28 | 保定开拓精密仪器制造有限责任公司 | Multi-channel accelerometer data acquisition system and method based on FPGA |
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