CN204287286U - A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit - Google Patents
A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit Download PDFInfo
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- CN204287286U CN204287286U CN201420651825.5U CN201420651825U CN204287286U CN 204287286 U CN204287286 U CN 204287286U CN 201420651825 U CN201420651825 U CN 201420651825U CN 204287286 U CN204287286 U CN 204287286U
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Abstract
The utility model discloses a kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit, comprise optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, analog drive circuit, D/A modular converter, computing machine; Wherein optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, computing machine are connected successively, and described optical phase modulator is connected with control module by analog drive circuit connected successively, D/A modular converter; The utility model realizes signals collecting based on monolithic FPGA, data export and with the control such as compunication, complete the detection to optical fiber current mutual inductor sensing head output signal and closed-loop control; This circuit has that structure is simple, integrated level is high, closed-loop control speed is fast, control accuracy high.
Description
Technical field
The utility model discloses a kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit, relate to technical field of circuit design.
Background technology
Current transformer detects major equipment as high-voltage fence, and the metering not being only electric energy provides parameter, and is for relay protection provides the foundation of action.Along with the development of national intelligent grid and extra-high voltage grid, conventional electromagnetic current transformer exposes its critical defect gradually, such as during voltage levels insulation very under difficulty, more high voltage easily magnetic saturation cause degradation under measuring accuracy.By contrast, optical fiber current mutual inductor has that anti-electromagnetic interference capability is strong, insulation is reliable, measuring accuracy is high, structure is simple and the plurality of advantages such as compact, is current research focus.As the core component of optical fiber current mutual inductor, its detection and control circuit has very important impact to current detection accuracy and scope.
Current detection and control circuit realiration mainly contains two schemes, one is for core with digital signal processing chip (DSP), because the speed goes of DSP is fast, DSP is made to become the first-selection of a lot of data processing and input scheme, but be its bottleneck in sequential control, because sequential control precision and speed directly affect the accuracy of detection of optical fiber current mutual inductor, so program control accuracy improves limited; Another kind is for core devices with field programmable gate array (FPGA) and DSP, in conjunction with both advantage, FPGA is utilized to carry out completion system sequential control, DSP realizes various digital signal processing algorithm, although very high control accuracy can be obtained, but system architecture relative complex, reliability decrease.
Meanwhile, in prior art, the general more complicated of structure of photoelectric switching circuit, the power consumption of circuit is larger.
Utility model content
Technical problem to be solved in the utility model is: for the defect of prior art, a kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit is provided, realize signals collecting based on monolithic FPGA, data export and with the control such as compunication, complete the detection to optical fiber current mutual inductor sensing head output signal and closed-loop control; This control circuit has that structure is simple, integrated level is high, closed-loop control speed is fast, control accuracy high, and the all-fiber current transformator meeting electric power network testing requirement for development is laid a good foundation.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
In conjunction with an optical fiber control circuit for low-power consumption photoelectric switching circuit, comprise optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, analog drive circuit, D/A modular converter, computing machine;
Wherein optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, computing machine are connected successively, and described optical phase modulator is connected with control module by analog drive circuit connected successively, D/A modular converter.
Described photoelectric switching circuit comprises current source, comparer, resistance and adjustable resistance, the positive pole of described current source is connected with the positive input terminal of comparer, one end of resistance respectively, the negative pole of current source is connected with the negative input end of comparer, one end of adjustable resistance respectively, the other end of resistance is connected with the other end of adjustable resistance, the output terminal of comparer respectively, as the output terminal of photoelectric switching circuit, the pull-up termination 5V power supply of comparer, the earth terminal ground connection of comparer.
As further prioritization scheme of the present utility model, described control module inside is provided with A/D interface control module, D/A interface control module; Described A/D interface control module, D/A interface control module connect A/D modular converter and D/A modular converter respectively.
As further prioritization scheme of the present utility model, the chip model of described A/D change-over circuit is AD9248.
As further prioritization scheme of the present utility model, described amplifilter comprises amplifying circuit and filtering circuit, and the chip that amplifying circuit adopts is difference amplifier chip AD8130.
As further prioritization scheme of the present utility model, the chip model that described D/A modular converter adopts is AD9726.
The utility model adopts above technical scheme compared with prior art, there is following technique effect: the utility model realizes signals collecting based on monolithic FPGA, data export and with the control such as compunication, complete the detection to optical fiber current mutual inductor sensing head output signal and closed-loop control; This control circuit has that structure is simple, integrated level is high, closed-loop control speed is fast, control accuracy high, and the all-fiber current transformator meeting electric power network testing requirement for development is laid a good foundation; Based on the all-fiber current transformator model machine that this control circuit is developed, after tested, all achieve 0.2 S level accuracy of measurement within the scope of its rated primary current 100 A ~ 4000 A, tentatively meet the requirement of electric power network to current transformer accuracy of measurement.
Accompanying drawing explanation
Fig. 1 is model calling schematic diagram of the present utility model.
Fig. 2 is the circuit diagram of low-power consumption photoelectric switching circuit in the utility model,
Wherein: Is is current source, U is comparer, and R is resistance, and Rf is adjustable resistance.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
Those skilled in the art of the present technique are understandable that, the correlation module related in the utility model and the function of realization thereof are the devices of hardware after improvement and formation thereof, device or system carry computer software programs conventional in prior art or pertinent protocols just can realize, and are not improve computer software programs of the prior art or pertinent protocols.Such as, the computer hardware system after improvement still can realize the specific function of this hardware system by loading existing operation system of software.Therefore, be understandable that, innovation of the present utility model is the improvement of hardware module in prior art and connects syntagmatic, but not be only in hardware module for realizing the improvement of software or the agreement of carrying about function.
Those skilled in the art of the present technique are understandable that, the correlation module mentioned in the utility model is the one or more hardware device for performing in step in operation, method, flow process described in the application, measure, scheme.Described hardware device for required object and specialized designs and manufacture, or also can adopt the known device in multi-purpose computer or other known hardware devices.Described multi-purpose computer activates or reconstructs with having storage procedure Selection within it.
Those skilled in the art of the present technique are appreciated that unless expressly stated, and singulative used herein " ", " one ", " described " and " being somebody's turn to do " also can comprise plural form.Should be further understood that, the wording used in instructions of the present utility model " comprises " and refers to there is described feature, integer, step, operation, element and/or assembly, but does not get rid of and exist or add other features one or more, integer, step, operation, element, assembly and/or their group.Should be appreciated that, when we claim element to be " connected " or " coupling " to another element time, it can be directly connected or coupled to other elements, or also can there is intermediary element.In addition, " connection " used herein or " coupling " can comprise wireless connections or couple.Wording "and/or" used herein comprises one or more arbitrary unit listing item be associated and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the utility model.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
Model calling schematic diagram of the present utility model as shown in Figure 1, in conjunction with an optical fiber control circuit for low-power consumption photoelectric switching circuit, comprise optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, analog drive circuit, D/A modular converter, computing machine;
Wherein optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, computing machine are connected successively, and described optical phase modulator is connected with control module by analog drive circuit connected successively, D/A modular converter.
In the utility model, the circuit diagram of low-power consumption photoelectric switching circuit as shown in Figure 2, described photoelectric switching circuit comprises current source, comparer, resistance and adjustable resistance, the positive pole of described current source is connected with the positive input terminal of comparer, one end of resistance respectively, the negative pole of current source is connected with the negative input end of comparer, one end of adjustable resistance respectively, the other end of resistance is connected with the other end of adjustable resistance, the output terminal of comparer respectively, as the output terminal of photoelectric switching circuit, the pull-up termination 5V power supply of comparer, the earth terminal ground connection of comparer.
As further prioritization scheme of the present utility model, the chip model of described A/D change-over circuit is AD9248.
As further prioritization scheme of the present utility model, described amplifilter comprises amplifying circuit and filtering circuit, and the chip that amplifying circuit adopts is difference amplifier chip AD8130.
As further prioritization scheme of the present utility model, the chip model that described D/A modular converter adopts is AD9726.
Because optical fiber sensor head output signal is more weak, and the noise information containing upper frequency, need it to be amplified and just can carry out after filtering process follow-up A/D conversion and be quantified as digital signal.Therefore amplifilter can affect follow-up measuring accuracy on the amplification of useful signal with on noise inhibiting ability.Amplifying circuit adopts difference amplifier AD8130, and this chip has very high common-mode rejection ratio, and being specially adapted to needs in the application of low noise, low harmonics distortion and high cmrr during feeble signal is amplified.The effective square-wave signal frequency of interchange that optical fiber sensor head exports is about 200 kHz, for ensureing that this square-wave signal is undistorted by rear end filtering circuit, the high-frequency cut-off frequency of filtering circuit must design with the harmonic wave of the square wave fundamental frequency signal not losing 20 times, simultaneously for avoiding high frequency noise to enter rear end sample quantization module, high-frequency cut-off bandwidth can not be too wide, adopts the pi type filter of 4 MHz bandwidth to realize front-end filtering in the utility model.
For ensureing 0.2S level accuracy of measurement, A/D changes figure place to be needed to reach more than 10.In addition, for ensureing 200 kHz square-wave signal each cycle low and high level sampling numbers, thus sampling precision can be improved by cumulative being averaging, need within each cycle square wave low and high level carry out respectively 20 times with up-sampling after be averaging, this just requires that analog to digital converter sampling rate is greater than 8 MS/s.The analog to digital converter AD9248 that certain surplus adopts quantization digit 14, sampling rate 20 MS/s is retained in design.
D/A modular converter is analog voltage signal the digital signal transition of 200 kHz, through optical phase modulator and analog drive circuit, thus the feedback phase shift that generation one is additional in Fibre Optical Sensor ring, balance out the phase differential detected in this closed-loop control cycle.The gain error of D/A modular converter and output linearity degree determine error and the linearity of outputting analog signal, and the error of simulating signal and the linearity to be applied on phase-modulator after or directly affect the departure of feedback phase, therefore need selection gain error and the little analog to digital converter of output linearity degree.The resolution of D/A modular converter directly determines the minimum resolving accuracy of phase control, and its resolution is more preferably greater than the resolution of A/D modular converter.The high-speed d/a chip AD9726 of 16 is adopted to realize this analog-digital conversion function in design.
The utility model realizes signals collecting based on monolithic FPGA, data export and with the control such as compunication, complete the detection to optical fiber current mutual inductor sensing head output signal and closed-loop control; This control circuit has that structure is simple, integrated level is high, closed-loop control speed is fast, control accuracy high, and the all-fiber current transformator meeting electric power network testing requirement for development is laid a good foundation; Based on the all-fiber current transformator model machine that this control circuit is developed, after tested, all achieve 0.2 S level accuracy of measurement within the scope of its rated primary current 100 A ~ 4000 A, tentatively meet the requirement of electric power network to current transformer accuracy of measurement.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also make a variety of changes under the prerequisite not departing from the utility model aim.The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model, any those skilled in the art, do not departing within the scope of technical solutions of the utility model, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solutions of the utility model content, according to technical spirit of the present utility model, within spirit of the present utility model and principle, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection domain all still belonging to technical solutions of the utility model.
Claims (5)
1. in conjunction with an optical fiber control circuit for low-power consumption photoelectric switching circuit, it is characterized in that: comprise optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, analog drive circuit, D/A modular converter, computing machine;
Wherein, optical fiber sensor head, optical phase modulator, photoelectric switching circuit, amplifilter, A/D modular converter, control module, computing machine are connected successively, and described optical phase modulator is connected with control module by analog drive circuit connected successively, D/A modular converter;
Wherein, described photoelectric switching circuit comprises current source, comparer, resistance and adjustable resistance, the positive pole of described current source is connected with the positive input terminal of comparer, one end of resistance respectively, the negative pole of current source is connected with the negative input end of comparer, one end of adjustable resistance respectively, the other end of resistance is connected with the other end of adjustable resistance, the output terminal of comparer respectively, as the output terminal of photoelectric switching circuit, the pull-up termination 5V power supply of comparer, the earth terminal ground connection of comparer.
2. a kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit according to claim 1, is characterized in that: described control module inside is provided with A/D interface control module, D/A interface control module; Described A/D interface control module, D/A interface control module connect A/D modular converter and D/A modular converter respectively.
3. a kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit according to claim 1, is characterized in that: the chip model of described A/D change-over circuit is AD9248.
4. a kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit according to claim 1, is characterized in that: described amplifilter comprises amplifying circuit and filtering circuit, and the chip that amplifying circuit adopts is difference amplifier chip AD8130.
5. a kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit according to claim 1, is characterized in that: the chip model that described D/A modular converter adopts is AD9726.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420651825.5U CN204287286U (en) | 2014-11-04 | 2014-11-04 | A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420651825.5U CN204287286U (en) | 2014-11-04 | 2014-11-04 | A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit |
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| CN204287286U true CN204287286U (en) | 2015-04-22 |
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| CN201420651825.5U Expired - Fee Related CN204287286U (en) | 2014-11-04 | 2014-11-04 | A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026049A (en) * | 2016-07-25 | 2016-10-12 | 国网山东省电力公司聊城供电公司 | Differential protection device based on optical current transformer |
| CN106124827A (en) * | 2016-06-24 | 2016-11-16 | 桂林创研科技有限公司 | A kind of all-fiber current transformator control system |
| CN108459291A (en) * | 2017-02-20 | 2018-08-28 | 武汉市欧睿科技有限公司 | All-fiber current transformator control circuit system |
-
2014
- 2014-11-04 CN CN201420651825.5U patent/CN204287286U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124827A (en) * | 2016-06-24 | 2016-11-16 | 桂林创研科技有限公司 | A kind of all-fiber current transformator control system |
| CN106026049A (en) * | 2016-07-25 | 2016-10-12 | 国网山东省电力公司聊城供电公司 | Differential protection device based on optical current transformer |
| CN106026049B (en) * | 2016-07-25 | 2018-10-16 | 国网山东省电力公司聊城供电公司 | Differential protection based on optical current mutual inductor |
| CN108459291A (en) * | 2017-02-20 | 2018-08-28 | 武汉市欧睿科技有限公司 | All-fiber current transformator control circuit system |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20171104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |