CN206609914U - The all-fiber current transformator in the independent double sampled loop of the closed loop based on single light path - Google Patents
The all-fiber current transformator in the independent double sampled loop of the closed loop based on single light path Download PDFInfo
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Abstract
The utility model is related to the all-fiber current transformator in the independent double sampled loop of the closed loop based on single light path, its circuit includes two A/D converter circuits, two DA change-over circuits and data processing unit, output of two A/D converter circuits to photodetector is exported two-way sampled data to data processing unit after carrying out independent sample, data processing unit is based on time-division multiplex technology and timesharing demodulation process generation two-way demodulation process signal is carried out to two-way sampled data and is sequentially output to corresponding DA change-over circuits, the phase modulation module that two DA change-over circuits are connected in light path is so as to be utilized respectively phase time division modulation and closed loop feedback of two DA change-over circuits in the enterprising traveling optical signal of phase modulation module, data processing unit obtains two-way measurement current data and exports to realize duplicate system retrofit requirement again respectively.The utility model uses single light path, and double AD samplings, the loop of double DA feedback modulations digital closed loops have the advantages that simple in construction, small volume, cost are low and integrated level is high.
Description
Technical field
The utility model is related to electrical equipment technical field, and particularly a kind of closed loop based on single light path is independently double sampled
The all-fiber current transformator in loop.
Background technology
All-fiber current transformator is the visual plant of relay protection and electric energy metrical in power system, for measuring transmission
In size of current, and the size of current measured is sent to measuring instrument and protective relaying device.It is based on faraday's magnetic
Luminous effect and Ampere circuit law, using digital control technology, the features such as with safe and accurate, alternating current-direct current compatible measurement, are adapted to
The new demand of intelligent grid.Existing all-fiber current transformator (FOCT) employs single light path, single channel AD samplings, numeral closes
The loop embodiment of ring, common structure as shown in Figure 1, in the optical path, light source 1 is successively through the laggard applying aspect modulation module 3 of beam splitter 2
Phase-modulation is carried out, and is propagated in optical fibre delay loop 4 and sensing fiber ring 5, the speculum 6 through the end face of sensing fiber ring 5 is anti-
After penetrating, return light is after the propagation of optical fibre delay loop 4, phase modulation module 3 and beam splitter 2, and the light for carrying phase information enters
Enter photodetector 7 and switch to electric signal；Electric signal is sampled by single channel A/D converter circuit again, data processing unit is believed
Number processing, and by single channel DA change-over circuits connect phase modulation module 3 carry out feedback closed loop, because sensing fiber ring 5 is set
Faraday magnetooptical effect occurs in conductor magnetic field, phase difference is directly proportional to the magnetic field intensity in conductor, and magnetic field intensity and electricity
Intensity of flow is directly proportional, so that data processing unit obtains the size of tested electric current and output.Above-mentioned all-fiber current transformator
Its degree of accuracy performance can meet 0.2 grade of requirement of national Specification, but require transformer duplicate system retrofit, double AD samplings
Electric power application scenario then show that design is not enough, user is typically only capable to combine installation together using two or many FOCT products,
Configuration requirement could be met.
Q/GDW 441-2010《Intelligent substation Protection Technology specification》Middle regulation, to ensure in protective relaying device
The requirement of transformer duplicate system retrofit, often covers in FOCT equipment (i.e. all-fiber current transformator) and preferably configures four protection sensing elements
Part (i.e. sensing fiber ring), (single AD systems, i.e. A/D converter circuit) is acquired by the sampling system of four tunnel independences, is adopted per two-way
Sample system data is exported to same MU by respective passage, as shown in Figure 2.Obviously, such as the FOCT products from scheme in Fig. 1
(i.e. all-fiber current transformator), then need to be installed together with four sets of independent FOCT products, can just be assembled into and a set of meet this
The FOCT equipment of the dual requirement of technical specification.This allocation plan is complicated, bulky, install cumbersome, cost it is strange
Height, does not possess good implementation when in high volume being equipped in transformer station.
Utility model content
The utility model is for the not enough implementation when configuring application of existing all-fiber current transformator dual design
Poor the problems such as there is provided a kind of all-fiber current transformator in the independent double sampled loop of closed loop based on single light path, using single
Light path, double AD samplings, the loop of double DA feedback modulations digital closed loops, the problem of solving FOCT duplicate system retrofits, with structure letter
List, small volume, cost be low and the advantages of high integrated level.
The technical solution of the utility model is as follows：
A kind of all-fiber current transformator in the independent double sampled loop of the closed loop based on single light path, including it is provided with one
Photodetector and phase modulation module in the light path and circuit of sensing fiber ring, the light path are collectively forming together with circuit
Closed loop, it is characterised in that the circuit includes two A/D converter circuits, two DA change-over circuits and data processing list
Member, two A/D converter circuits are connected with the photodetector in light path, output of two A/D converter circuits to photodetector
Two-way sampled data is exported to data processing unit after carrying out independent sample, the data processing unit is based on time division multiplexing
Technology carries out timesharing demodulation process to two-way sampled data and generates two-way demodulation process signal and be sequentially output to corresponding DA turns
Circuit is changed, the phase modulation module that described two DA change-over circuits are connected in light path is electric so as to be utilized respectively two DA conversions
Road is in the phase time division modulation and closed loop feedback of the enterprising traveling optical signal of phase modulation module, and the data processing unit obtains respectively
Two-way measurement current data exports to realize duplicate system retrofit requirement again.
One period is divided into some sub- periods and read in turn according to sequential is divided by the data processing unit
The sampled data of two A/D converter circuits, carries out the timesharing demodulation process of two-way sampled data, and exports in turn successively to corresponding
DA change-over circuits.
The period that the data processing unit includes being sequentially connected divides and processing module, closed loop demodulation module and closed loop
Calculation process module, the period divides and processing module connects two A/D converter circuits and two DA change-over circuits simultaneously,
The period is divided and a demodulation period is divided into several and demodulates sub- period, the closed loop demodulation by processing module
The sampled data for reading two A/D converter circuits in each demodulation sub- period in turn is carried out timesharing demodulation process and obtains two by module
Inputted after the closed loop demodulating data of road to closed loop calculation process module and send two-way closed loop demodulating data to the period and divided
And processing module, period divide and processing module also by the two-way closed loop demodulating data of reception respectively carry out square wave and
Sequentially input after staircase waveform overlap-add procedure as two-way closed loop modulation data to corresponding DA change-over circuits, at the closed loop computing
The unified output two-way measurement current data of sample rate that reason module is required according to user.
The period divides and processing module includes period division module, biasing square wave generation module, staircase waveform life
Into module and overlap-add procedure module, the period division module connects two A/D converter circuits, two DA change-over circuits simultaneously
One demodulation period is divided into several with closed loop demodulation module and the period division module and demodulates the sub- period,
The biasing square wave generation module generation biasing square wave, the staircase waveform generation module is connected with closed loop demodulation module for docking
The two-way closed loop demodulating data of receipts is respectively processed generation two-way staircase waveform, the two-way rank of the staircase waveform generation module generation
Terraced ripple and the square wave of biasing square wave generation module generation are inputted to overlap-add procedure module carries out the folded of staircase waveform and square wave in turn
Plus sequentially input after processing as two-way closed loop modulation data to corresponding DA change-over circuits.
One demodulation cycle is divided into several demodulation subcycles and according to division sequential wheel by the data processing unit
Stream reads the sampled data of two A/D converter circuits, carries out the timesharing demodulation process of two-way sampled data, and exports in turn successively
To corresponding DA change-over circuits.
The cycle that the data processing unit includes being sequentially connected divides and processing module, closed loop demodulation module and closed loop fortune
Processing module is calculated, the cycle divides and processing module connects two A/D converter circuits and two DA change-over circuits simultaneously, described
Cycle is divided and a demodulation cycle is divided into several demodulation subcycles by processing module, and the closed loop demodulation module is by each solution
The sampled data progress timesharing demodulation process for reading two A/D converter circuits in the tune cycle in turn obtains two-way closed loop demodulation number
According to it is rear input to closed loop calculation process module and by two-way closed loop demodulating data send to the cycle divide and processing module, it is described
Cycle is divided and processing module is also respectively carried out the two-way closed loop demodulating data of reception after square wave and staircase waveform overlap-add procedure
Sequentially input as two-way closed loop modulation data to corresponding DA change-over circuits, the closed loop calculation process module will according to user
The unified output two-way measurement current data of sample rate asked.
The closed loop calculation process module includes closed loop thermal correcting process module and the closed loop proportional amendment being sequentially connected
Processing module, the closed loop thermal correcting process module is connected with closed loop demodulation module.
Photodetector in the light path includes the first photodetector and the second photodetector, and described two AD turn
Changing circuit includes the first A/D converter circuit and the second A/D converter circuit, first photodetector and the first A/D converter circuit phase
Even, second photodetector is connected with the second A/D converter circuit.
The light path includes light source, the first beam splitter, phase modulation module and the optical fibre delay loop being sequentially connected, the phase
Position modulation module includes first phase modulation module, second phase modulation module and the second beam splitter, the first phase modulation
The two ends of module connect a pin of the first beam splitter and a pin of the second beam splitter, the second phase modulation respectively
The two ends of module connect another pin of the first beam splitter and another pin of the second beam splitter, second beam splitting respectively
The 3rd pin connection optical fibre delay loop of device；Described two DA change-over circuits include the first DA change-over circuits and the 2nd DA is changed
Circuit, the first DA change-over circuits connect first phase modulation module, and the 2nd DA change-over circuits connection second phase is adjusted
Molding block.
The first phase modulation module includes first polarizer and the first straight wave guide being connected with each other, first beam splitting
Device is connected with first polarizer, and first straight wave guide is connected with the second beam splitter, the first DA change-over circuits connection first
Straight wave guide；The second phase modulation module includes second polarizer and the second straight wave guide being connected with each other, first beam splitting
Device is connected with second polarizer, and second straight wave guide is connected with the second beam splitter, the 2nd DA change-over circuits connection second
Straight wave guide；
Or, the first phase modulation module includes the first Y waveguide and the 3rd beam splitter, one of first beam splitter
Pin connects the combining end of the first Y waveguide, and 0 ° of a branch end for first Y waveguide is welded to a pipe of the 3rd beam splitter
Pin, 0 ° or 90 ° of another branch end of first Y waveguide is welded to another pin of the 3rd beam splitter, described 3rd point
3rd pin of beam device connects a pin of the second beam splitter；The second phase modulation module include the second Y waveguide and
4th beam splitter, another pin of first beam splitter connects the combining end of the second Y waveguide, the one of second Y waveguide
Individual 0 ° of branch end is welded to a pin of the 4th beam splitter, and 0 ° or 90 ° of another branch end of second Y waveguide is welded to
Another pin of 4th beam splitter；3rd pin of the 4th beam splitter connects another pin of the second beam splitter.
Technique effect of the present utility model is as follows：
The all-fiber current transformator in the independent double sampled loop of the closed loop based on single light path that the utility model is provided, electricity
Road includes two A/D converter circuits, two DA change-over circuits and data processing unit, i.e., using single light path, double AD samplings,
The loop of double DA feedback modulations digital closed loops, output of two A/D converter circuits to photodetector is carried out after independent sample, by
Data processing unit is based on time-division multiplex technology and timesharing demodulation process generation two-way demodulation process letter is carried out to two-way sampled data
Number and be sequentially output to corresponding DA change-over circuits, data processing unit obtain respectively two-way measurement current data export again, number
Sampled data according to processing unit timesharing successively in turn to A/D converter circuit is demodulated processing, and timesharing carries out two-way AD samplings,
DA is modulated, mutual independent, the non-interfering transformer data of output two-way, realizes two independences simultaneously in an integrated fashion
The function of FOCT products, the two-way FOCT for only needing a set of the utility model FOCT products to export data processing unit in the application
Data cube computation MU, it is to avoid configuration is complicated caused by prior art four independent FOCT products are installed together, volume is huge
The problems such as big and cost is high, the problem of can solve the problem that FOCT duplicate system retrofits, with simple in construction, small volume, cost it is low and
The advantages of integrated level is high, with good implementation when in high volume being equipped in transformer station.Timesharing demodulation process and final output
Be two-way measure the passage of current data, i.e., two current measurement data, can obtain be time-multiplexed algorithm sequential, closed loop solution
The current value recalled, precision is low if the division working time is short, can be not used in electric energy metrical, relay protection；If the work divided
Then precision height, stability are good for the time length of work, available for electric energy metrical, relay protection.
Closed loop described in the utility model based on single light path is independently in the all-fiber current transformator in double sampled loop
One period can be divided into some sub- periods and read two AD turns in turn according to sequential is divided by data processing unit
Change the sampled data of circuit, a demodulation cycle can also be divided into several demodulation subcycles and according to divide sequential in turn
The sampled data of two A/D converter circuits is read, specifically can flexibly divide as needed, a period is such as divided into two
One demodulation cycle is divided into two demodulation subcycles by the sub- period, and A/D converter circuit and the DA conversions of two-way are corresponded to respectively
One period, can also be divided into three sub- periods or a demodulation cycle is divided into the demodulation of more than three by circuit
Subcycle, data processing unit divides the sampled data for reading two-way A/D converter circuit in turn successively according to sequential, carries out two-way
The timesharing demodulation process of sampled data, and export in turn successively to corresponding DA change-over circuits, output two-way current value is used for electricity
Can measurement, relay protection.
It is preferably provided with closed loop thermal correcting process module and closed loop proportional that closed loop calculation process module includes being sequentially connected
Correcting process module, closed loop thermal correcting process module can to variation error amendment of the closed loop demodulating data under high/low temperature,
Closed loop proportional correcting process module can be to the ratio error amendment between closed loop demodulating data and primary current, it is ensured that transformer
The requirement of combination misalignment is disclosure satisfy that under protective current.
Brief description of the drawings
Fig. 1 is the structural representation of existing all-fiber current transformator.
Fig. 2 is existing all-fiber current transformator defined configuration structure in a standard.
Fig. 3 is the knot of the independent all-fiber current transformator in double sampled loop of closed loop of the utility model based on single light path
Structure schematic diagram.
Fig. 4 is the electricity of the independent all-fiber current transformator in double sampled loop of closed loop of the utility model based on single light path
Road preferred structure schematic diagram.
Fig. 5 is timing diagram of the data processing unit using time division multiplexing algorithm.
Fig. 6 is the electricity of the independent all-fiber current transformator in double sampled loop of closed loop of the utility model based on single light path
Another preferred structure schematic diagram on road.
Fig. 7 be closed loop of the utility model based on single light path independently the all-fiber current transformator in double sampled loop the
Two kinds of preferred structure schematic diagrames.
Fig. 8 a and Fig. 8 b are two kinds of preferred structure schematic diagrames of phase modulation module.
Fig. 9 be closed loop of the utility model based on single light path independently the all-fiber current transformator in double sampled loop the
Three kinds of preferred structure schematic diagrames.
Each label lists as follows in figure：
1- light sources；2- beam splitters；The beam splitters of 21- first；The beam splitters of 22- second；The beam splitters of 23- the 3rd；3- phases
Position modulation module；31- first phase modulation modules；32- second phase modulation modules；311-Y waveguides；312- straight wave guides；
The 313- polarizers；4- optical fibre delay loops；5- sensing fiber rings；6- speculums；7- photodetectors；The photoelectricity of 71- first
Detector；The photodetectors of 72- second.
Embodiment
The utility model is illustrated below in conjunction with the accompanying drawings.
The utility model is related to a kind of all-fiber current transformator in the independent double sampled loop of closed loop based on single light path,
For the current measurement in power system, it includes light path part and circuit part (abbreviation light path and circuit), as shown in figure 3,
Light path includes light source 1, light-splitting device (can use beam splitter 2, it would however also be possible to employ coupler, circulator etc.), phase modulation module
3rd, optical fibre delay loop 4 and sensing fiber ring 5 and photodetector 7, circuit is generally integrated (can be described as signal transacting on circuit boards
Circuit board), a sensing fiber ring 5 is set in light path, and there is the photodetection in speculum 6, light path one end of sensing fiber ring 5
Device 7 and phase modulation module 3 are collectively forming closed loop together with circuit.For circuit：Circuit includes two A/D converter circuits, two
Individual DA change-over circuits and data processing unit, two A/D converter circuits are connected with the photodetector 7 in light path, two AD
Change-over circuit is to exporting two-way sampled data to data processing unit, number after the output progress independent sample of photodetector
Time-division multiplex technology is based on according to processing unit, and timesharing demodulation process generation two-way demodulation process signal is carried out to two-way sampled data
And be sequentially output to corresponding DA change-over circuits, two DA change-over circuits be connected to phase modulation module 3 in light path so as to
Phase time division modulation and closed loop feedback of two DA change-over circuits in the enterprising traveling optical signal of phase modulation module 3 are utilized respectively, number
Two-way measurement current data is obtained respectively according to processing unit to export FOCT data again to realize duplicate system retrofit requirement.
Closed loop of the utility model based on single light path independently the all-fiber current transformator in double sampled loop circuit tool
There are specific structure, including double A/D converter circuits and double DA change-over circuits, the also data processing unit with particular job, the data
One period is preferably divided into some sub- periods and reads two AD conversion electricity in turn according to sequential is divided by processing unit
The sampled data on road, carries out the timesharing demodulation process of two-way sampled data, and exports in turn successively to corresponding DA change-over circuits.
Closed loop based on single light path independently the circuit of the all-fiber current transformator in double sampled loop preferred structure as shown in figure 4,
Wherein, data processing unit is included at the period division being sequentially connected and processing module, closed loop demodulation module and closed loop computing
Module is managed, the period divides and processing module connects two A/D converter circuits and two DA change-over circuits simultaneously, and the period divides
And a demodulation period is divided into several and demodulates the sub- period by processing module, closed loop demodulation module demodulates the sub- time by each
The sampled data progress timesharing demodulation process for reading two A/D converter circuits in section in turn obtains defeated after two-way closed loop demodulating data
Enter to closed loop calculation process module and send two-way closed loop demodulating data to the period to divide and processing module, i.e. period
It is transmitted in both directions between division and processing module and closed loop demodulation module, the period divides and processing module is except being modulated solution
Adjust the period to divide outer, also the two-way closed loop demodulating data of reception is respectively carried out after square wave and staircase waveform overlap-add procedure as
Two-way closed loop modulation data is sequentially input to corresponding DA change-over circuits, the sampling that closed loop calculation process module is required according to user
The unified output two-way measurement current data of rate.Period divides and the operation principle of processing module is to demodulate period τ by one
It is divided into the n sub- period τ of demodulation1、τ2……τn, the time for respectively demodulating the sub- period can identical or difference, that is to say, that
Period is divided and processing module as needed can flexibly be divided the demodulation period, is entered within each demodulation sub- period
Row individually demodulation, respectively demodulates separate between the sub- period, each demodulates the sub- period for closed loop demodulation mode.For example, when
Between section divide and demodulation period τ is averagely divided into two sub- period τ of demodulation by processing module1And τ2, now at data
Unit is managed in τ1The interior sampled data for reading first A/D converter circuit, exported after signal demodulation to first DA conversion electricity
Road, then in the phase-modulation and feedback closed loop of the enterprising traveling optical signal of phase modulation module 1, data processing unit obtains a passage
FOCT data；In τ2The interior sampled data for reading second A/D converter circuit, is exported to second DA after carrying out signal demodulation
Change-over circuit, then in the phase-modulation and feedback closed loop of the enterprising traveling optical signal of phase modulation module, data processing unit obtains the
The FOCT data of two passages.If the period is divided and a demodulation period τ is divided into n demodulation sub- time by processing module
Section τ1、τ2……τnWhen be the sampled data for reading two A/D converter circuits in turn successively, so continue repeatedly.It can be transported through closed loop
Calculate processing module and carry out such as temperature adjustmemt and ratio amendment processing, required according to user, it is unified according to the sample rate of regulation
Output includes the FOCT data frames of two channel datas, finally realizes duplicate system retrofit, the application demand of double AD samplings, output
Current data be used for electric energy metrical, relay protection.
Preferably, period division and processing module is set to include period division module, biasing square wave generation module, rank
Terraced ripple generation module and overlap-add procedure module, another preferred structure of circuit as shown in Figure 6, period division module are connected simultaneously
Two A/D converter circuits, two DA change-over circuits and closed loop demodulation module and period division module demodulate the period by one
It is divided into several and demodulates sub- period, biasing square wave generation module generation biasing square wave, staircase waveform generation module and closed loop solution
Mode transfer block is connected is respectively processed generation two-way staircase waveform, staircase waveform generation mould for the two-way closed loop demodulating data to reception
The two-way staircase waveform of block generation and the square wave of biasing square wave generation module generation input to overlap-add procedure module and enter row order in turn
Sequentially input after the overlap-add procedure of terraced ripple and square wave as two-way closed loop modulation data to corresponding DA change-over circuits.Closed loop is demodulated
Module is in τ1The interior sampled data for reading first A/D converter circuit simultaneously carries out signal demodulation and obtains closed loop demodulating data all the way,
Staircase waveform generation module carries out processing generation staircase waveform all the way, the road staircase waveform and biasing square wave to the closed loop demodulating data on the road
The square wave of generation module generation is inputted to overlap-add procedure module to be used as after the overlap-add procedure for carrying out staircase waveform and square wave and closed all the way
Ring modulation data is inputted to first DA change-over circuit；Closed loop demodulation module is in τ2The interior sampling for reading second A/D converter circuit
Data simultaneously carry out the closed loop demodulating data that signal demodulation obtains another road, and staircase waveform generation module is demodulated to the closed loop on second tunnel
Data carry out processing the second road staircase waveform of generation, and the road staircase waveform and the square wave of biasing square wave generation module generation are inputted to folded
Plus processing module inputted after the overlap-add procedure of staircase waveform and square wave as the second tunnel closed loop modulation data to second DA and turned
Change circuit；The closed loop demodulating data that closed loop demodulation module simultaneously also obtains demodulation inputs defeated again to closed loop calculation process module
Go out.
One demodulation cycle can also be divided into several demodulation subcycles and according to division sequential by data processing unit
The sampled data of two A/D converter circuits is read in turn, carries out the timesharing demodulation process of two-way sampled data, and it is defeated in turn successively
Go out to corresponding DA change-over circuits.Now, it is preferable that the cycle that data processing unit includes being sequentially connected divides and processing mould
Block, closed loop demodulation module and closed loop calculation process module, the cycle divide and processing module connect simultaneously two A/D converter circuits and
Two DA change-over circuits, the cycle is divided and a demodulation cycle is divided into several demodulation subcycles, closed loop solution by processing module
The sampled data for reading two A/D converter circuits in each demodulation subcycle in turn is carried out timesharing demodulation process and obtains two by mode transfer block
Inputted after the closed loop demodulating data of road to closed loop calculation process module and by two-way closed loop demodulating data send to the cycle divide and
Processing module, that is to say, that according to sequential dividing condition, such as read adopting for first A/D converter circuit in first subcycle
Sample data simultaneously carry out demodulation process and obtain first via closed loop demodulating data, and second A/D converter circuit is read in second subcycle
Sampled data and carry out demodulation process and obtain the second tunnel closed loop demodulating data, reading first AD again in the 3rd subcycle turns
Change the sampled data of circuit and carry out demodulation process and obtain first via closed loop demodulating data, second is read in the 4th subcycle
The sampled data of A/D converter circuit simultaneously carries out demodulation process and obtains the second tunnel closed loop demodulating data, so continues repeatedly.Cycle draws
Be divided to and processing module the two-way closed loop demodulating data of reception is respectively also subjected to square wave and staircase waveform overlap-add procedure after be used as two
Road closed loop modulation data is sequentially input to corresponding DA change-over circuits, the sample rate that closed loop calculation process module is required according to user
Unified output two-way measurement current data.Closed loop calculation process module preferably includes the closed loop thermal correcting process mould being sequentially connected
Block and closed loop proportional correcting process module, closed loop thermal correcting process module are connected with closed loop demodulation module, closed loop proportional amendment
Processing module final output, closed loop thermal correcting process module can be repaiied to variation error of the closed loop demodulating data under high/low temperature
Just, the utility model all-fiber current transformator can be placed in high-low temperature chamber, its temperature can be set up by thermocycling
Model, then carries out temperature adjustmemt by software；Closed loop proportional correcting process module can be to closed loop demodulating data and once electricity
Ratio error amendment between stream, it is ensured that transformer disclosure satisfy that the requirement of combination misalignment under protective current.
Fig. 7 be closed loop of the utility model based on single light path independently the all-fiber current transformator in double sampled loop the
Two kinds of preferred structure schematic diagrames.Light path includes light source 1, the first beam splitter 21, phase modulation module, the optical fiber delay being sequentially connected
Ring 4 and sensing fiber ring 5, in addition to photodetector 7, the phase modulation module of the embodiment include first phase modulation module
31st, the beam splitter 22 of second phase modulation module 32 and second, the two ends of first phase modulation module 31 connect the first beam splitting respectively
One pin of device 21 and a pin of the second beam splitter 22, the two ends of second phase modulation module 32 connect first point respectively
Another pin of another pin of beam device 21 and the second beam splitter 22, the 3rd pin connection optical fiber of the second beam splitter 22
Ring retard 4；Two DA change-over circuits include the first DA change-over circuits and the 2nd DA change-over circuits, the first DA change-over circuits connection the
One phase modulation module 31, the 2nd DA change-over circuits connection second phase modulation module 32.First phase modulation module 31 and
Two phase modulation module 32 carries out time division modulation.For light path：The light sent by light source 1, by (or the coupling of the first beam splitter 21
Device, circulator etc.) after be divided into two beam identical optical signals, respectively enter first phase modulation module 31, second phase modulation mould
Block 32.Optical signal is each acted in the first and second phase modulation modules by not phase-modulation in the same time, enters back into the
Two beam splitters 22 (or coupler, circulator etc.) a branch of optical signal is merged into, then in optical fibre delay loop 4, sensing fiber ring 5
Propagate, reflected by the speculum 6 of the end face of sensing fiber ring 5, be returned to the second beam splitter 22 and be divided into two beam identical optical signals,
Again respectively through first phase modulation module 31, second phase modulation module 32, and after the propagation of the first beam splitter 21,
Into photodetector 7.
For circuit：Data processing unit with reference to shown in Fig. 5 is carried out specifically using the timing diagram of time division multiplexing algorithm
Bright, data processing unit is preferred to use FPGA.Because the two-beam reflected is while into photodetector 7, carry two
The measurement data of individual passage, it is therefore desirable to which the output with the A/D converter circuit of two-way independence to photodetector 7 carries out double sampled.
The data of two-way AD samplings are unified to be handled by same fpga chip, but FPGA is not to handle two paths of data in the same time
, but according to time-multiplexed principle, carry out time-division processing.For example FPGA reads (the first AD turns of AD1 in t1~t2 periods
Change circuit) data, complete signal demodulation after, recycle DA1 (the first DA change-over circuits) on first phase modulation module 31
Enter the phase-modulation and feedback closed loop of traveling optical signal, then the FOCT data of Acquisition channel one；AD2 is read in t2~t3 periods
The data of (the second A/D converter circuit), complete after signal demodulation, recycle DA2 (the 2nd DA change-over circuits) to be modulated in second phase
The FOCT data of the phase-modulation and feedback closed loop, then Acquisition channel two of the enterprising traveling optical signal of module 32；Again in t3~t4
Between section read AD1 (the first A/D converter circuit) data ... Acquisition channel one FOCT data；Read in t4~t5 periods
The FOCT data of AD2 (the second A/D converter circuit) data ... Acquisition channel two；So continue to repeat.It is multiple by such time-division
With processing, FPGA will obtain the measurement data of two passages, and be required according to user, according to the sample rate (such as 4kHz) of regulation,
Unified output includes the FOCT data frames of two channel datas, finally realizes duplicate system retrofit, the application demand of double AD samplings.
From fig. 5, it can be seen that in the FOCT data obtained in t1~t2 periods, the time is long, precision is high, available for electric energy metrical, after
Electric protection etc..
In this light path, first phase modulation module 31, second phase modulation module 32 can use the members such as Y waveguide, straight wave guide
Part is constituted, and typical implementation method has two kinds of Fig. 8 a and Fig. 8 b.Fig. 8 a be by the way of Y waveguide, now, phase modulation module
(first phase modulation module 31, second phase modulation module 32) includes Y waveguide and beam splitter, for example, first phase modulates mould
Block 31 includes the first Y waveguide (311 i.e. shown in Fig. 8 a) and the 3rd beam splitter 23, and a pin of the first beam splitter 21 connects the
The combining end of one Y waveguide 311,0 ° of a branch end for the first Y waveguide 311 is welded to a pin of the 3rd beam splitter 23, the
0 ° or 90 ° of another branch end of one Y waveguide 311 is welded to another pin of the 3rd beam splitter 23, the 3rd beam splitter 23
3rd pin connects a pin of the second beam splitter 22.Equally, the structure of second phase modulation module 32 and annexation are former
Reason is identical, and it includes the second Y waveguide and the 4th beam splitter, and another pin of the first beam splitter 21 connects the conjunction of the second Y waveguide
Terminal, 0 ° of a branch end for the second Y waveguide is welded to a pin of the 4th beam splitter, another branch of the second Y waveguide
0 ° or 90 ° of end is welded to another pin of the 4th beam splitter；3rd pin of the 4th beam splitter connects the second beam splitter 22
Another pin.Two signal electrodes of the push-pull type Y waveguide of current main flow can also be taken into apart two independent electricity
Pole, two pieces of internal lithium niobate crystal waveguides work independently, so as to be equivalent to first phase modulation module 31, the second phase simultaneously
The allomeric function of position modulation module 32.Fig. 8 b are the modes of straight wave guide, now phase modulation module (first phase modulation module
31st, second phase modulation module 32) include the polarizer and straight wave guide of interconnection, for example, first phase modulation module 31 is wrapped
Include first polarizer (313 i.e. shown in Fig. 8 b) and the first straight wave guide (312 i.e. shown in Fig. 8 b) of interconnection, the first beam splitting
Device 21 is connected with first polarizer 313, and the first straight wave guide 312 is connected with the second beam splitter 22, the first DA change-over circuits connection the
One straight wave guide 312；Second phase modulation module 32 includes second polarizer and the second straight wave guide being connected with each other, the first beam splitter
21 are connected with second polarizer, and the second straight wave guide is connected with the second beam splitter 22, and the 2nd DA change-over circuits connect the second straight wave guide.
Fig. 9 be closed loop of the utility model based on single light path independently the all-fiber current transformator in double sampled loop the
Photodetector in three kinds of preferred structure schematic diagrames, light path described in the embodiment includes the first photodetector 71 and the second light
Electric explorer 72, two A/D converter circuits include the first A/D converter circuit and the second A/D converter circuit, the first photodetector 71
It is connected with the first A/D converter circuit, the second photodetector 72 is connected with the second A/D converter circuit.Beam splitter 2 in the embodiment
3*1 beam splitters, 3*2 beam splitters or 3*3 beam splitters can be used.
The all-fiber current transformator in the independent double sampled loop of closed loop of the utility model based on single light path, for current
The deficiency of FOCT duals design, proposes a kind of single light path, double AD samplings, double DA modulation, the loop of digital closed loop, solves
The problem of FOCT duplicate system retrofits, the program shares a set of light path, shares a set of signal processing circuit board, and timesharing carries out two-way AD
Sampling, DA modulation, output two-way are independent mutually, and non-interfering transformer data realize two simultaneously in an integrated fashion
The function of independent FOCT products.Scheme of the present utility model possesses the advantages of simple in construction, small volume, cost are low, integrated level is high.
It should be pointed out that embodiment described above can make those skilled in the art that the present invention is more fully understood
Create, but do not limit the invention in any way is created.Therefore, although this specification is created with embodiment to the present invention referring to the drawings
Make and have been carried out detailed description, it will be understood by those skilled in the art, however, that still can be modified to the invention
Or equivalent substitution, in a word, all technical schemes for not departing from the spirit and scope of the invention and its improvement, it all should contain
Cover among the protection domain of the invention patent.
Claims (8)
1. a kind of all-fiber current transformator in the independent double sampled loop of closed loop based on single light path, including it is provided with a biography
The photodetector and phase modulation module felt in the light path and circuit of fiber optic loop, the light path are collectively forming together with circuit and closed
Loop back path, it is characterised in that the circuit includes two A/D converter circuits, two DA change-over circuits and data processing unit,
Two A/D converter circuits are connected with the photodetector in light path, and output of two A/D converter circuits to photodetector is carried out
Two-way sampled data is exported to data processing unit after independent sample, the data processing unit is based on time-division multiplex technology
Carry out timesharing demodulation process generation two-way demodulation process signal to two-way sampled data and be sequentially output to corresponding DA to change electricity
Road, described two DA change-over circuits are connected to the phase modulation module in light path, and the data processing unit obtains two respectively
Drive test amount current data is exported again.
2. all-fiber current transformator according to claim 1, it is characterised in that the data processing unit is included successively
The period of connection divides and processing module, closed loop demodulation module and closed loop calculation process module, and the period divides and located
Manage module and connect two A/D converter circuits and two DA change-over circuits simultaneously.
3. all-fiber current transformator according to claim 2, it is characterised in that the period divides and processing module
Including period division module, biasing square wave generation module, staircase waveform generation module and overlap-add procedure module, the period draws
Sub-module connects two A/D converter circuits, two DA change-over circuits and closed loop demodulation module, the staircase waveform generation module simultaneously
It is connected with closed loop demodulation module, two-way staircase waveform and the generation module generation of biasing square wave of the staircase waveform generation module generation
Square wave is inputted to overlap-add procedure module after the overlap-add procedure for carrying out staircase waveform and square wave in turn as two-way closed loop modulation data
Sequentially input to corresponding DA change-over circuits.
4. all-fiber current transformator according to claim 1, it is characterised in that the data processing unit is included successively
The cycle of connection divides and processing module, closed loop demodulation module and closed loop calculation process module, and the cycle divides and processing mould
Block connects two A/D converter circuits and two DA change-over circuits simultaneously.
5. the all-fiber current transformator according to Claims 2 or 3 or 4, it is characterised in that the closed loop calculation process mould
Block includes the closed loop thermal correcting process module and closed loop proportional correcting process module being sequentially connected, the closed loop thermal Corrections Division
Reason module is connected with closed loop demodulation module.
6. the all-fiber current transformator according to one of Claims 1-4, it is characterised in that the photoelectricity in the light path
Detector includes the first photodetector and the second photodetector, and described two A/D converter circuits include the first A/D converter circuit
With the second A/D converter circuit, first photodetector is connected with the first A/D converter circuit, second photodetector with
Second A/D converter circuit is connected.
7. the all-fiber current transformator according to one of Claims 1-4, it is characterised in that the light path is included successively
The light source of connection, the first beam splitter, phase modulation module and optical fibre delay loop, the phase modulation module are adjusted including first phase
Molding block, second phase modulation module and the second beam splitter, the two ends of the first phase modulation module connect first point respectively
One pin of beam device and a pin of the second beam splitter, the two ends of the second phase modulation module connect first point respectively
Another pin of beam device and another pin of the second beam splitter, the 3rd pin connection optical fiber of second beam splitter prolong
Chi Huan；Described two DA change-over circuits include the first DA change-over circuits and the 2nd DA change-over circuits, the first DA change-over circuits
First phase modulation module is connected, the 2nd DA change-over circuits connect second phase modulation module.
8. all-fiber current transformator according to claim 7, it is characterised in that the first phase modulation module includes
First polarizer and the first straight wave guide being connected with each other, first beam splitter are connected with first polarizer, the first straight ripple
Lead and be connected with the second beam splitter, the first DA change-over circuits connect the first straight wave guide；The second phase modulation module includes
Second polarizer and the second straight wave guide being connected with each other, first beam splitter are connected with second polarizer, the second straight ripple
Lead and be connected with the second beam splitter, the 2nd DA change-over circuits connect the second straight wave guide；
Or, the first phase modulation module includes the first Y waveguide and the 3rd beam splitter, a pin of first beam splitter
The combining end of the first Y waveguide is connected, 0 ° of a branch end for first Y waveguide is welded to a pin of the 3rd beam splitter,
0 ° or 90 ° of another branch end of first Y waveguide is welded to another pin of the 3rd beam splitter, the 3rd beam splitter
The 3rd pin connect the second beam splitter a pin；The second phase modulation module includes the second Y waveguide and the 4th
Beam splitter, another pin of first beam splitter connects the combining end of the second Y waveguide, one point of second Y waveguide
0 ° of terminal is welded to a pin of the 4th beam splitter, and 0 ° or 90 ° of another branch end of second Y waveguide is welded to the 4th
Another pin of beam splitter；3rd pin of the 4th beam splitter connects another pin of the second beam splitter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109696180A (en) * | 2018-12-13 | 2019-04-30 | 北京航空航天大学 | Superhigh precision optical fibre gyro quantization error suppressing method based on bipolar electrode Y waveguide |
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Cited By (1)
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| CN109696180A (en) * | 2018-12-13 | 2019-04-30 | 北京航空航天大学 | Superhigh precision optical fibre gyro quantization error suppressing method based on bipolar electrode Y waveguide |
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