CN205748484U

CN205748484U - A kind of multichannel data acquisition system based on FPGA

Info

Publication number: CN205748484U
Application number: CN201620643041.7U
Authority: CN
Inventors: 游雪肖; 赵大方; 陈敬华; 程舰; 唐余武
Original assignee: WUXI YAN'AO ELECTRONIC TECHNOLOGY Co Ltd; Hubei Normal University
Current assignee: WUXI YAN'AO ELECTRONIC TECHNOLOGY Co Ltd; Hubei Normal University
Priority date: 2016-06-24
Filing date: 2016-06-24
Publication date: 2016-11-30
Anticipated expiration: 2026-06-24

Abstract

The utility model discloses a kind of multichannel data acquisition system based on FPGA, including a sensor group, one I V change-over circuit, one magnifier, one or eight way switch modules, a filter circuit, an analog-to-digital conversion module, one FPGA control module, a serial communication module and a level conversion bus transceiver；For analogue signal, system is passed through signal conditioning circuit, various analogue signals is converted to 0 5V DC voltage, and this voltage is carried out analog digital conversion by analog to digital conversion circuit, and the magnitude of voltage digital quantity of acquisition is sent to FPGA process；For pulse signal, system passes through signal conditioning circuit, by level conversion operation, various pulse signals is converted to digital signal and exports to being analyzed in FPGA processing.This utility model can have low cost to realize the collection to multi-signal forms such as current signal, voltage signal, low frequency microvolt voltage signals, simple to operate, and the advantages such as processing speed is fast can be widely applied to scientific experiment place and industrial site.

Description

A kind of multichannel data acquisition system based on FPGA

Technical field

This utility model relates to industrial data monitoring technical field, more particularly, to a kind of multichannel based on FPGA Data collecting system.

Background technology

Recently as computer technology level and the fast development of science power, whether in scientific research place, extensive Among industry spot or national defense construction, the digital display circuit of modernization has obtained increasingly extensive application, to various electronic signals Data acquisition have become as the key technology realizing digital display circuit.

Most of data collecting cards of equal cost in the market, often for the factor such as cost and market, gather letter Number kind of interface less；Meanwhile, at some, measurement performance is required higher place, the data acquisition of domestic unit independent research Collecting system performance is slightly worse, there is also certain gap, sampling rate, all Shortcomings, the sample rate such as sampling precision compared with abroad General all at several below GSPS, bandwidth is less than 200MHz, and digital to analog converter figure place mostly is less than 12；Finally, the most domestic Acquisition system universal functionality is the most single, and port number and kind of interface are less, and range of application is less.

Utility model content

For problems of the prior art, the purpose of this utility model is that design provides a kind of many based on FPGA Channel data acquisition system, solves data collecting system universal functionality the most single, and port number and kind of interface are less, applies model Enclose the technical problems such as less.

For solving above-mentioned purpose, this utility model provides a kind of multichannel data acquisition system based on FPGA, including One sensor group, an I-V change-over circuit, a magnifier, one or eight way switch modules, a filter circuit, an analog digital conversion Module, a FPGA control module, a serial communication module and a level conversion bus transceiver, wherein: described sensor group will Current signal exports to described I-V change-over circuit；Low frequency microvolt voltage signal is exported and puts to described instrument by described sensor group Big circuit；The current signal of storage is converted to voltage signal and exports to described eight way switch modules by described I-V change-over circuit；Institute State magnifier be amplified by the low frequency microvolt voltage signal of storage and export to described eight way switch modules；Described eight The voltage signal of storage is exported to described filter circuit by way switch module；The voltage signal of storage is carried out by described filter circuit Filter and export to described analog-to-digital conversion module；Described analog-to-digital conversion module voltage signal is converted to digital signal output to Described FPGA control module；The digital signal of acquisition is analyzed and processed and is transferred to described serial and leads to by described FPGA control module News module.

Compared with prior art, this utility model has the advantages that multi-channel data acquisition system based on FPGA System comprises voltage signal, current signal, low frequency microvolt signal (mV level), grating pulse signal, normal pulsed signal, Start/ The multiple input signal interfaces such as Stop signal, system interface type is abundanter, can complete pressure transducer in laboratory, weigh The multiple sensors such as sensor, flow transducer, grating sensor, magneto strictive sensor, temperature sensor, speed probe Measurement；While keeping lower cost, cover the analog signal form that most industry is on-the-spot, except can be applicable to section Grind the signals collecting in field, more can extensively apply the data monitoring in industrial and agricultural production, at the data in industrial stokehold Reason, or even entertainment life, the more areas such as domestic electronic, there is important actual application value and meaning.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments the utility model is further explained explanation.

Fig. 1 is overall structure schematic diagram of the present utility model；

Description of reference numerals: 1 sensor group；2 I-V change-over circuits；3 magnifiers；4 eight way switch moulds Block；5 filter circuits；6 analog-to-digital conversion modules；7 FPGA control modules；8 serial communication modules；9 level conversion are total Line transceiver.

Detailed description of the invention

Being described in detail this utility model below in conjunction with the accompanying drawings, the description of this part is only exemplary and explanatory, Protection domain of the present utility model should there be is not any restriction effect.In conjunction with figure below, this utility model is made furtherly Bright.

Fig. 1, a kind of based on FPGA multichannel data acquisition system that this utility model provides, including a sensor group 1, One I-V change-over circuit 2, magnifier 3, a 1 way switch module 4, a filter circuit 5, an analog-to-digital conversion module 6, one FPGA control module 7, serial communication module 8 and a level conversion bus transceiver 9；Sensor group 1 is electric with I-V conversion respectively Road 2, magnifier 3, eight way switch module 4, level conversion bus transceiver 9 are connected, and I-V change-over circuit 2 is opened with eight tunnels Closing module 4 to be connected, magnifier 3 is connected with eight way switch modules 4, and eight way switch modules 4 are connected with filter circuit 5, filter Wave circuit 5 is connected with analog-to-digital conversion module 6, and analog-to-digital conversion module 6 is connected with FPGA control module 7, FPGA control module 7 and string Row communication module 8 is connected, and level conversion bus transceiver 9 is connected with FPGA control module 7.

Sensor group 1 includes current signal output type sensor, low frequency microvolt signal output type sensor and digit pulse Signal output type sensor: wherein current signal output type sensor includes pressure transducer, SCFT turbine flowmeter and SCT temperature Degree sensor；Low frequency microvolt signal output type sensor includes that BSS LOAD CELLS, CR LOAD CELLS, CXH bellows are weighed biography Sensor；Digital pulse signal output type sensor includes grating displacement sensor, magnetostrictive displacement sensor and photoelectric coding Device；Current signal, voltage signal, low frequency microvolt voltage signal are exported and open to I-V change-over circuit 2, eight tunnel by sensor group 1 respectively Closing module 4, magnifier 3, sensor group 1 also can be by output of pulse signal to level conversion bus transceiver 9 simultaneously.

I-V change-over circuit 2 is the output voltage being converted to the electric current of current source be proportional to；I-V change-over circuit 2 will The current signal of input is converted to voltage signal and exports to eight way switch modules 4.

Magnifier 3 is a kind of precision differential voltage amplifier circuit, has the list of Differential Input and relative reference edge End output；The low frequency microvolt voltage signal of storage is amplified and exports to eight way switch modules 4 by magnifier 3.

Eight way switch modules 4 are single 8 digital control simulant electronic switches of passage, have the lowest conduction impedance and cut-off leakage Electric current, has extremely low quiescent dissipation in whole power range, and in the case of 10V power voltage supply, switching time is only For 160ns, fully meet the time demand of switch Guan Bi switching at a high speed during circulating sampling；Eight way switch modules 4 will be deposited The voltage signal of storage exports to filter circuit 5.

Filter circuit 5 is the alternating component in the DC voltage reducing pulsation, retains its flip-flop, makes output voltage stricture of vagina Wave system number reduces, and waveform becomes smoother；The voltage signal of storage is filtered and exports to analog digital conversion by filter circuit 5 Module 6.

Analog-to-digital conversion module 6 is the circuit converting analog signals into digital signal, referred to as AD conversion, the work of AD conversion With being that Time Continuous, amplitude also continuous print analog quantity are converted to the digital signal that time discrete, amplitude are the most discrete；Analog digital conversion Voltage signal is converted to digital signal and exports to FPGA control module 7 by module 6.

The pulse signal of the various ways from different sensors is passed through level conversion by level conversion bus transceiver 9 Mode, is converted to digital signal and is transferred to FPGA control module 7.

The digital signal of acquisition is analyzed and processed and is transferred to serial communication module 8 by FPGA control module 7；It forms knot Structure and operation principle belong to prior art, do not repeat them here.

Serial communication module 8 is to allow data sequentially transfer one by one, and serial line interface feature is that communication line is simple, only Want a pair transmission line just can realize two-way communication；Serial communication module 8 uses MAX232 chip to be made by level conversion The digital signal of FPGA control module 7 and the data of host computer, command interaction.

A kind of based on intelligent electric meter the energy consumption data that this utility model provides is analyzed system and is comprised the following steps:

Sensor group 1 current signal, voltage signal, low frequency microvolt voltage signal are exported respectively to I-V change-over circuit 2, Eight way switch modules 4, magnifier 3, output of pulse signal also can be received and dispatched by sensor group 1 to level conversion bus simultaneously Device 9, the current signal of storage is converted to voltage signal and exports to eight way switch modules 4 by I-V change-over circuit 2, and instrument amplifies electricity The low frequency microvolt voltage signal of storage is amplified and exports to eight way switch modules 4 by road 3, and eight way switch modules 4 will storage Voltage signal export to filter circuit 5, the voltage signal of storage is filtered and exports to analog digital conversion mould by filter circuit 5 Block 6, voltage signal is converted to digital signal and exports to FPGA control module 7 by analog-to-digital conversion module 6, and level conversion bus is received Sending out device 9 by level conversion, the pulse signal of acquisition is obtained digital signal and exports to FPGA control module 7, FPGA controls mould The digital signal of acquisition is analyzed and processed and is transferred to serial communication module 8 and realizes the data with host computer, order with this by block 7 Alternately.

The above, be only preferred embodiment of the present utility model, not make technical scope of the present utility model Go out any restriction, thus every according to technical spirit of the present utility model, above example is made any trickle amendment, equivalent Change and modification, in the range of all still falling within the technical solution of the utility model.

Claims

1. a multichannel data acquisition system based on FPGA, it is characterised in that include a sensor group, an I-V conversion electricity Road, a magnifier, one or eight way switch modules, a filter circuit, an analog-to-digital conversion module, a FPGA control module, one Serial communication module and a level conversion bus transceiver, wherein: current signal is exported and turns to described I-V by described sensor group Change circuit；Low frequency microvolt voltage signal is exported to described magnifier by described sensor group；Described I-V change-over circuit will The current signal of storage is converted to voltage signal and exports to described eight way switch modules；Described magnifier is low by storage Frequently microvolt voltage signal is amplified and exports to described eight way switch modules；Described eight way switch modules are by the voltage letter of storage Number output to described filter circuit；The voltage signal of storage is filtered and exports to described analog digital conversion by described filter circuit Module；Voltage signal is converted to digital signal and exports to described FPGA control module by described analog-to-digital conversion module；Described The digital signal of acquisition is analyzed and processed and is transferred to described serial communication module by FPGA control module.

2. multichannel data acquisition system as claimed in claim 1, it is characterised in that voltage signal is passed by described sensor group It is defeated by described eight way switch modules.

3. multichannel data acquisition system as claimed in claim 1, it is characterised in that pulse signal is passed by described sensor group It is defeated by described level conversion bus transceiver.

4. multichannel data acquisition system as claimed in claim 1, it is characterised in that described level conversion bus transceiver will The pulse signal obtained obtains digital signal by level conversion and is transferred to described FPGA control module.

5. multichannel data acquisition system as claimed in claim 1, it is characterised in that described filter circuit uses step low-pass Voltage is filtered by filter circuit.

6. multichannel data acquisition system as claimed in claim 1, it is characterised in that described serial communication module uses MAX232 chip realizes level conversion, is completed the data of described FPGA control module and host computer by described serial communication module And command interaction.