Summary of the invention
The purpose of this invention is to provide many of a kind of realizations, simultaneously, big data quantity ground measures the direct current formate field intensity, and be sent in real time and carry out statistical study on the PC, the size of true reflection formate field intensity and the DC resultant field method of distribution are to overcome the deficiency that existing separate unit analogue measurement device can not reflect the formate field intensity truth comprehensively.
To achieve these goals, the invention provides a kind of DC resultant field device, it comprises at least one slave computer unit, host computer unit and PC (computing machine), communication is realized with the host computer unit respectively in every slave computer unit, the host computer unit links to each other with PC, be characterized in: the slave computer unit is by synthetic field sensor, signal processing circuit, single-chip microcomputer, communication module, A/D (mould/number conversion) chip and power module are formed, the output terminal of synthetic field sensor links to each other with the signal processing circuit input end, the output terminal of signal processing circuit joins with single-chip microcomputer and A/D chip respectively, the output of A/D chip is connected with single-chip microcomputer, single-chip microcomputer also is connected with communication module, and power module is given single-chip microcomputer respectively, A/D chip and communication module provide power supply.
Described host computer unit is made up of communication module, single-chip microcomputer, display screen, operation keyboard and power module, and single-chip microcomputer links to each other with communication module, display screen, operation keyboard and PC respectively, and power module provides power supply for single-chip microcomputer, communication module.
Above-mentioned synthetic field sensor is synthetic field sensor of the fast gate-type of driven by motor or the synthetic field sensor of magnetic shake formula.
Above-mentioned communication module is serial communication modular or wireless communication module.
The measuring method that direct current is synthetic is: be AC signal by synthetic field sensor with the DC electric field conversion of signals earlier, signal processing circuit comprises polarity decision circuitry and amplitude treatment circuit, realizes that the amplitude of feeble signal is amplified and field intensity polarity arbitration functions; Communication module guarantees the communication between host computer, the slave computer; Single-chip microcomputer is handled in real time to the signal of gathering; The data that PC is uploaded single-chip microcomputer show, add up, analyze, and provide measurement result and various chart, characteristic value data.
The synthetic field of above-mentioned direct current comprises amplitude and polarity, and wherein polar signal is Hall tach signal and the synthetic generation of amplitude signal with the dc brushless motor control panel.
Adopt DC resultant field device of the present invention, can measure the size of the formate field intensity of direct current electric transmission and transformation engineering convenient, efficiently and accurately.For the evaluation of direct current electric transmission and transformation engineering-environment provides science data monitoring foundation.Simultaneously, the present invention adopts total digitalization to show, has friendly man-machine interface, is a kind of DC transmission engineering resultant field device that function of statistic analysis is arranged, and can measure the formate field intensity of DC transmission engineering convenient, efficiently and accurately.
The present invention is further detailed explanation below in conjunction with drawings and Examples, but this embodiment should not be construed as limitation of the present invention.
The present invention includes: at least one slave computer unit, host computer unit and PC (Fig. 1), the communication module of every slave computer unit links to each other with the communication module of host computer unit, and the single-chip microcomputer of host computer links to each other with PC.Described slave computer unit is made up of synthetic field sensor, signal processing circuit, single-chip microcomputer, communication module, A/D chip and power module, the output terminal of synthetic field sensor links to each other with the signal processing circuit input end respectively, the output terminal of signal processing circuit links to each other with the A/D chip with single-chip microcomputer respectively, the A/D chip other end links to each other with single-chip microcomputer, single-chip microcomputer links to each other with communication module again, and power module links to each other with single-chip microcomputer, A/D chip, communication module respectively.Described host computer unit is made up of communication module, single-chip microcomputer, display screen, operation keyboard and power module, and single-chip microcomputer links to each other with PC with communication module, display screen, operation keyboard and power module respectively, and power module links to each other with communication module.
The signal processing circuit of slave computer of the present invention unit is made of amplitude amplifying circuit, polarity decision circuitry (Fig. 2) and amplitude treatment circuit (Fig. 3), wherein the amplitude amplifying circuit will synthesize faint AC signal that field sensor transmits and amplify 10000 times through 3 grades and reach a volt level signal, become d. c. voltage signal through rectifying and wave-filtering again, sample for the A/D chip.AC signal after the polarity decision circuitry will be amplified is through the LM393 generation square-wave signal of comparing with zero level, deliver to the D end of d type flip flop, the CLK of d type flip flop end is connected to the rotating speed square wave output terminal (sensor phase signal) of dc brushless motor, just judges the polarity of DC voltage according to the level of the output Q end of d type flip flop; A/D chip: in order to improve precision, reduce volume, the present invention adopts 12 serial ports A/D conversion chip A/D7895,2.5 volts power supply benchmark is provided with ADR421 simultaneously, measurement range according to 0-50kV/m, the present invention can reach the precision of 12V/m in theory, if will further improve the A/D chip that precision should adopt 24; Single-chip microcomputer: the slave computer major function is the positive-negative polarity of sampling A/D value and DC voltage, can meet the demands with the PIC2051 single-chip microcomputer; Power module: adopt the module of the band isolated form of the single-ended input both-end output of wide region, lithium battery voltage is converted to ± 5 volts of voltages are single-chip microcomputer and operational amplifier power supply.Communication module: because longest distance can reach 50m between the upper and lower computer, so select 485 communications for use.
Slave computer cell operation principle of the present invention is: two voltage signals of drawing from sensor are after operational amplifier amplifies.This moment, signal was divided into two-way, and one the tunnel links to each other with rectification circuit through after the RC low-pass filtering, linked to each other with the crus secunda of AD7895 chip after passing through RC filtering again, and 4,5,6 of AD7895 chip links to each other with p1.0, p1.1, p1.2 and the p1.3 of single-chip microcomputer with 7 pin; Another road signal links to each other with LM393,1 pin of LM393 links to each other with 11 pin of U4E through resistance R 6 backs, 10 pin of U4E link to each other with 4013 D end, the rotating speed square wave output terminal of dc brushless motor links to each other with 1 pin of U4A through behind the R7,2 pin of U4A are held with 4013 CLK and are linked to each other, and 4013 Q end links to each other with the P3.3 end of single-chip microcomputer.The RXD of single-chip microcomputer links to each other with 4 pin with 1 pin of communication module 485 respectively with the TXD end.1 pin of power module links to each other with lithium battery with 2 pin, and 6 pin of lithium battery are through linking to each other with the VCC end of single-chip microcomputer, AD7895, TL084 and communication module 485 respectively behind the inductance of 100uH, and 6 pin of lithium battery are through linking to each other with the VSS end of TL084 behind the inductance of 100uH.
Above-mentioned polarity decision circuitry also can by a shaping circuit that adds photoresistance produce with change after the consistent synchronizing signal of electric field phase of ac signal, electric field signal and synchronizing signal produce the composite signal that has polarity through multiplier, this signal is through the positive negative dc voltage of low-pass filtering, positive voltage is represented positive pole, and negative voltage is represented negative pole (Fig. 4).
Host computer of the present invention unit mainly contains one-chip computer module, and its major function is to give PC with the data that slave computer comes, and the data of also slave computer being come show on the liquid crystal of this unit in addition, adopts 8051 as controller; Communication module has two kinds, and a kind of is 485 communication modules, and communicates by letter between the slave computer, and another kind is CH431, and it converts 8051 serial communication the USB interface of standard to, directly links to each other with PC; LCD interface is used for connecting liquid crystal display; Power module 7805 converts lithium battery voltage to+5V voltage, gives single-chip microcomputer, liquid crystal display and other chip power supplies.
Real-time display window on the display interface of PC of the present invention unit shows the data that transmit from the slave computer unit in real time; The data sorting window is pressed the data of real-time display window little of big series arrangement; The eigenwert window provided satisfy a synthetic environmental evaluation 80%, 95%, mean value and maximal value; Scatter chart has provided synthetic distribution curve, can understand synthetic the regularity of distribution intuitively; In addition the software of PC unit time of 100 groups of data of can selecting to sample, also the data of real-time display window, data sorting window and eigenwert window can be preserved with form.
The present invention is when measuring, and the measuring point spacing that the ground formate field intensity of circuit, current conversion station is measured is 5m, order survey to the subpoint of polar conductor ground or outside the current conversion station enclosure wall 50m place only or according to actual conditions measure to zone of reasonableness.The sheet metal that mill should use 1m * 1m is as the ground connection reference planes, and with its reliable ground.
PC installed software of the present invention is by 10 measuring point ground formate field intensity measurement data statistics, each measuring point data: 100 data of at every turn sampling, the sampling interval time can be set, arrange by size, provide just the 95th of maximal value, 95% value, just the 80th of 80% value, and draw the distribution curve of 10 measuring points, with convenient environmental evaluation to DC line or current conversion station.The present invention adopts low-power consumption motor and element in addition, uses lithium battery power supply, is convenient to long-time field survey and carries.
The content that is not described in detail in this instructions belongs to this area professional and technical personnel's known prior art.