CN108593993A - Induction based on line load electric current takes electrical measuring systems - Google Patents
Induction based on line load electric current takes electrical measuring systems Download PDFInfo
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- CN108593993A CN108593993A CN201810716527.2A CN201810716527A CN108593993A CN 108593993 A CN108593993 A CN 108593993A CN 201810716527 A CN201810716527 A CN 201810716527A CN 108593993 A CN108593993 A CN 108593993A
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- 230000006698 induction Effects 0.000 title claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 43
- 230000005611 electricity Effects 0.000 claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000005070 sampling Methods 0.000 claims description 28
- 239000004065 semiconductor Substances 0.000 claims description 24
- 230000001012 protector Effects 0.000 claims description 4
- 239000002707 nanocrystalline material Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 6
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- 102100031545 Microsomal triglyceride transfer protein large subunit Human genes 0.000 description 3
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- 206010037660 Pyrexia Diseases 0.000 description 2
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- 230000004308 accommodation Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 230000006870 function Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of inductions based on line load electric current to take electrical measuring systems; belong to two distant distribution terminal inductions and takes electrical measurement, including sequentially connected CT electricity getting devices, full-wave rectification bridge, second order filter, system protection circuit, MPPT controller, MSP432 processors；One output end of the second order filter is connected with the input terminal of a voltage detecting circuit, and the output end of the voltage detecting circuit connects an input terminal of the MSP432 processors；The secondary output of the CT electricity getting devices is connected with the input terminal of power grid quality detection circuit, and the output end of the power grid quality detection circuit connects the input terminal of the MSP432 processors.The present invention uses multichannel power management system, intelligent power switching management, low current capacity operation can be realized in the case of no external power supply, utilize the thinking for protection of adaptively releasing, it is controlled with electronic power switch to realize that energy is released using the monitoring of energy cell voltage, to realize the protection of entire power-supply circuit, effectively extend life of product.
Description
Technical field
The present invention relates to two distant distribution terminal inductions to take Electric Measurement Technology field, and in particular to one kind being applied to two distant distribution
The induction based on line load electric current of terminal takes electricity and measuring system.
Background technology
Broad, the grid structure complexity present situation based on China power distribution network distribution region, using economic, to install portable two distant
Basic model distribution terminal promotes automation coverage rate, distribution automation scale benefit is further formed, to China's power distribution network
Development is of great significance.But there are problems, especially power-supply system for existing aerial two distant basic model distribution terminals
With Fault feature of single phase earthing measuring system, the popularization and application of two distant distribution terminals are seriously limited.
Aerial two distant basic model distribution terminals existing at present are primarily present problems with, first, distribution line load current
Smaller, CT inductions take electric scarce capacity, are centainly made up although electricity can be taken to do by solar energy, solar energy way to take power is by wet weather
It and air quality influence, and are susceptible to the problem of power-supply system takes electric deficiency, can not support terminal long-play.Secondly,
When being applied to the larger circuit of load current or fault moment short circuit current is big, power-supply system damage is easily caused, although can rely on
Mos is managed and voltage monitoring carries out power drain, but still is easily caused CT and taken electric the first diode of power circuit clamper fever serious.
Third, conventional failure indicator and two distant distribution terminals are basic in terms of phase (zero sequence) current measurement precision and frequency response characteristic
Upper missing.
Drawbacks described above will be to realizing that distribution automation all standing, promotion power supply reliability propose challenge, therefore, power supply system
The innovation of system and current measurement will be following key technology and development trend.
Invention content
The purpose of the present invention is to provide a kind of inductions based on line load electric current to take electrical measuring systems, above-mentioned to solve
Technical problem in background technology.
To achieve the goals above, this invention takes following technical solutions：
A kind of induction based on line load electric current provided by the invention takes electrical measuring systems, including sequentially connected CT to take
Electric appliance, full-wave rectification bridge, second order filter, system protection circuit, MPPT controller, MSP432 processors；The second-order filter
One output end of device is connected with the input terminal of a voltage detecting circuit, described in the output end connection of the voltage detecting circuit
One input terminal of MSP432 processors；The secondary output of the CT electricity getting devices is connected with the input terminal of power grid quality detection circuit,
The output end of the power grid quality detection circuit connects the input terminal of the MSP432 processors.
Further, the system protection circuit includes battery management system, energy steering circuit, overpower protecting, monitoring
Circuit, battery voltage sampling circuit, the first diode, discharge resistance, metal-oxide-semiconductor and the first capacitance composition；
The anode of first diode connects an output end of the second order filter, the cathode of first diode
It is separately connected the input terminal of one end and the energy steering circuit of first capacitance, the other end connection of first capacitance
The MPPT controller；
The output end of the energy steering circuit is separately connected the input terminal of the MPPT controller and the overpower is prevented
The input terminal of shield monitoring circuit, an output end of the overpower protecting, monitoring circuit connect the another defeated of the MPPT controller
Enter end, another output end of the overpower protecting, monitoring circuit connects an input terminal of the MSP432 processors；
The input terminal of the discharge resistance connects an output end of the second order filter, the output end of the discharge resistance
The source electrode of the metal-oxide-semiconductor is connected, the drain electrode of the metal-oxide-semiconductor connects the input terminal of the second order filter, the grid of the metal-oxide-semiconductor
Connect an input terminal of the MSP432 processors；
The battery management system is parallel with the second capacitance, and one end of second capacitance connects the negative of the second diode
Pole, the anode of second diode connect the cathode of first diode, described in the other end connection of second capacitance
The input terminal of second order filter；
One output end of the battery management system connects the input terminal of the battery voltage sampling circuit, the cell tube
Another output end of reason system connects the input terminal of the system capacity control circuit by first switch, and the first switch is also
One end of first capacitance is connected by second switch, the output end of the battery voltage sampling circuit connects the MSP432
One input terminal of processor.
Further, the overpower protecting, monitoring circuit includes voltage monitoring comparator, the voltage monitoring comparator
Input terminal connect the output end of the energy steering circuit, another input terminal connection described two of the voltage monitoring comparator
The output end of rank filter, the output end of the voltage monitoring comparator connect an input terminal of the MSP432 processors.
Further, the voltage detecting circuit includes sequentially connected first resistor bleeder circuit, first voltage sampling
The input terminal of isolator, the first resistor bleeder circuit connects the second of the full-wave rectification bridge by the second order filter
The output end of pin, the first voltage sampling isolator connects the input terminal of the MSP432 processors.
Further, the power grid quality detection circuit include be sequentially connected second resistance bleeder circuit, second voltage is adopted
Sample isolator, two input terminals of the second resistance bleeder circuit are separately connected the both ends of the CT electricity getting devices.
Further, the both ends of the CT electricity getting devices are separately connected the first pin and third pipe of the full-wave rectification bridge
Foot；Second pin of the full-wave rectification bridge connects the input terminal and described of the discharge resistance by the second order filter
The input terminal of one diode；The output end of the discharge resistance connects the input terminal of the metal-oxide-semiconductor, the output end of the metal-oxide-semiconductor
The 4th pin of the full-wave rectification bridge is connected by the second order filter.
Further, it is connected with relay protector between CT electricity getting devices and the MSP432 processors.
Advantageous effect of the present invention：The present invention is economical and practical, and using multichannel power management system, collection CT takes electric maximal efficiency
Point tracking, backup battery, the first capacitance management are in one, intelligent power switching management；Built-in disposable large capacity, long-life
Lithium thionyl chloride cell and high-performance charge the first capacitance, electricity, circuit 5A can be continuously taken within the scope of 3~630A of circuit
Meet product capacity operation, without battery, to effectively extend life of product.
For line fault overcurrent and lightning impulse, using the thinking for protection of adaptively releasing, using energy pond electricity
Pressure monitoring is controlled with electronic power switch to realize that energy is released, to realize the protection of entire power-supply circuit.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, others are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is that the induction based on line load electric current described in the embodiment of the present invention takes electrical measuring systems basic principle frame
Figure.
Fig. 2 is the system protection circuit functional block diagram described in the embodiment of the present invention.
Fig. 3 is the CT electricity getting device sectional views described in the embodiment of the present invention.
Fig. 4 is the energy content of battery control unit functional block diagram described in the embodiment of the present invention.
Fig. 5 is the current measurement sample circuit figure described in the embodiment of the present invention.
Fig. 6 is the circuit diagram of the integrating circuit described in the embodiment of the present invention.
Wherein：1-CT electricity getting devices；2- full-wave rectification bridges；3- second order filters；4- system protection circuits；5-MPPT is controlled
Device；6-MSP432 processors；7- voltage detecting circuits；8- power grid quality detection circuits；9- battery management systems；10- energy controls
Circuit processed；11- overpower protecting, monitoring circuits；12- battery voltage sampling circuits；The first diodes of 13-；14- discharge resistances；
15-MOS is managed；The first capacitances of 16-；The second capacitances of 17-；The second diodes of 18-；19- first switches；20- second switches；21-
One resistor voltage divider circuit；22- first voltages sample isolator；The second pins of 23-；24- second resistance bleeder circuits；25- second
Voltage sample isolator；The first pins of 26-；27- third pins；The 4th pins of 28-；29- relay protectors.
Specific implementation mode
Embodiments of the present invention are described in detail below, and the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that is used in the specification of the present invention arranges
It refers to there are the feature, integer, step, operation, element and/or component, but it is not excluded that presence or addition to take leave " comprising "
Other one or more features, integer, step, operation, element and/or their group.It should be understood that " connection " used herein
Or " coupling " may include being wirelessly connected or coupling, the wording "and/or" used include one or more associated list
Any cell of item and all combination.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology) there is meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, will not be with idealizing or the meaning of too formal be explained.
It is of the invention for ease of understanding, explanation is further explained to the present invention with specific embodiment below in conjunction with the accompanying drawings, and
Specific embodiment does not constitute the restriction to the embodiment of the present invention.
It should be appreciated by those skilled in the art that attached drawing is the schematic diagram of embodiment, the component in attached drawing is not necessarily
Implement necessary to the present invention.
Embodiment one
An embodiment of the present invention provides a kind of inductions based on line load electric current to take electrical measuring systems as shown in Figure 1, packet
Include sequentially connected CT electricity getting devices 1, full-wave rectification bridge 2, second order filter 3, system protection circuit 4, MPPT controller 5,
MSP432 processors 6；One output end of the second order filter 3 is connected with the input terminal of a voltage detecting circuit 7, the voltage
The output end of detection circuit 7 connects an input terminal of the MSP432 processors 6；The secondary output of the CT electricity getting devices 1 connects
There are the input terminal of power grid quality detection circuit 8, the output end of the power grid quality detection circuit 8 to connect the MSP432 processors
6 input terminal.
As shown in Fig. 2, the system protection circuit 4 is anti-including battery management system 9, energy steering circuit 10, overpower
16 groups of shield monitoring circuit 11, battery voltage sampling circuit 12, the first diode 13, discharge resistance 14, metal-oxide-semiconductor 15 and the first capacitance
At；
The anode of first diode 13 connects an output end of the second order filter 3, first diode 13
Cathode be separately connected first capacitance 16 one end and the energy steering circuit 10 input terminal, first capacitance 16
The other end connect the MPPT controller 5；
The output end of the energy steering circuit 10 is separately connected the input terminal of the MPPT controller 5 and the overpower
One output end of the input terminal of protecting, monitoring circuit 11, the overpower protecting, monitoring circuit 11 connects the MPPT controller 5
Another input terminal, it is one defeated to connect the MSP432 processors 6 another output end of the overpower protecting, monitoring circuit 11
Enter end；
The input terminal of the discharge resistance 14 connects an output end of the second order filter 3, the discharge resistance 14
Output end connects the source electrode of the metal-oxide-semiconductor 15, and the drain electrode of the metal-oxide-semiconductor 15 connects the input terminal of the second order filter 3, described
The grid of metal-oxide-semiconductor 15 connects an input terminal of the MSP432 processors 6；
The battery management system 9 is parallel with the second capacitance 17, and one end of second capacitance 17 connects the second diode
18 cathode, the anode of second diode 18 connect the cathode of first diode 13, second capacitance 17 it is another
One end connects the input terminal of the second order filter 3；
One output end of the battery management system 9 connects the input terminal of the battery voltage sampling circuit 12, the electricity
Another output end of pond management system 9 connects the input terminal of the system capacity control circuit 10 by first switch 19, described
First switch 19 also connects one end of first capacitance 16 by second switch 20, the battery voltage sampling circuit 12 it is defeated
Outlet connects an input terminal of the MSP432 processors 6.
The overpower protecting, monitoring circuit 11 includes voltage monitoring comparator, the input terminal of the voltage monitoring comparator
The output end of the energy steering circuit 10 is connected, another input terminal of the voltage monitoring comparator connects the second-order filter
The output end of device 3, the output end of the voltage monitoring comparator connect an input terminal of the MSP432 processors 6.
The voltage detecting circuit 7 includes sequentially connected first resistor bleeder circuit 21, first voltage sampling isolator
22, the input terminal of the first resistor bleeder circuit 21 connects the second of the full-wave rectification bridge 2 by the second order filter 3
The output end of pin 23, the first voltage sampling isolator 22 connects the input terminal of the MSP432 processors 6.
The power grid quality detection circuit 8 includes being sequentially connected second resistance bleeder circuit 24, second voltage sampling isolation
Device 25, two input terminals of the second resistance bleeder circuit 24 are separately connected the both ends of the CT electricity getting devices 1.
The both ends of the CT electricity getting devices 1 are separately connected the first pin 26 and third pin 27 of the full-wave rectification bridge 2；Institute
It states the second pin 22 of full-wave rectification bridge 2 and the input terminal of the discharge resistance 14 and described is connected by the second order filter 3
The input terminal of first diode 13；The output end of the discharge resistance 14 connects the input terminal of the metal-oxide-semiconductor 15, the metal-oxide-semiconductor
15 output end connects the 4th pin 28 of the full-wave rectification bridge 2 by the second order filter 3.
It is connected with relay protector 29 between CT electricity getting devices 1 and the MSP432 processors 6.
The CT electricity getting devices, using nanocrystalline material coil, double opening structures, initial permeability is low, takes electric energy power strong.
As shown in figure 3, the coating cut lengths tolerance d1 of coil is 53.0 ± 1.0mm, the outer diameter d2 of coil is 75.5 ±
1.0mm。
The full-wave rectification bridge can reduce energy of the voltage on the first diode using low pressure drop diode rectifier bridge
Amount loss.
Embodiment two
One kind provided by Embodiment 2 of the present invention takes electricity and its measuring system based on the induction of line load electric current, including successively
The CT electricity getting devices 1 of connection, full-wave rectification bridge 2, second order filter 3, system protection circuit 4, MPPT controller 5, MSP432 processing
Device 6；One output end of the second order filter 3 is connected with the input terminal of a voltage detecting circuit 7, the voltage detecting circuit 7
Output end connect an input terminal of the MSP432 processors 6；The secondary output of the CT electricity getting devices 1 is connected with power grid quality
The input terminal of detection circuit 8, the output end of the power grid quality detection circuit 8 connect the input terminal of the MSP432 processors 6.
The system protection circuit 4 includes battery management system 9, energy steering circuit 10, overpower protecting, monitoring circuit
11, battery voltage sampling circuit 12, the first diode 13, discharge resistance 14, metal-oxide-semiconductor 15 and the first capacitance 16 composition；Described
The anode of one diode 13 connects an output end of the second order filter 3, and the cathode of first diode 13 is separately connected
The other end of the input terminal of one end and the energy steering circuit 10 of first capacitance 16, first capacitance 16 connects institute
State MPPT controller 5；
The output end of the energy steering circuit 10 is separately connected the input terminal of the MPPT controller 5 and the overpower
One output end of the input terminal of protecting, monitoring circuit 11, the overpower protecting, monitoring circuit 11 connects the MPPT controller 5
Another input terminal, it is one defeated to connect the MSP432 processors 6 another output end of the overpower protecting, monitoring circuit 11
Enter end；
The input terminal of the discharge resistance 14 connects an output end of the second order filter 3, the discharge resistance 14
Output end connects the source electrode of the metal-oxide-semiconductor 15, and the drain electrode of the metal-oxide-semiconductor 15 connects the input terminal of the second order filter 3, described
The grid of metal-oxide-semiconductor 15 connects an input terminal of the MSP432 processors 6；
The battery management system 9 is parallel with the second capacitance 17, and one end of second capacitance 17 connects the second diode
18 cathode, the anode of second diode 18 connect the cathode of first diode 13, second capacitance 17 it is another
One end connects the input terminal of the second order filter 3；
One output end of the battery management system 9 connects the input terminal of the battery voltage sampling circuit 12, the electricity
Another output end of pond management system 9 connects the input terminal of the system capacity control circuit 10 by first switch 19, described
First switch 19 also connects one end of first capacitance 16 by second switch 20, the battery voltage sampling circuit 12 it is defeated
Outlet connects an input terminal of the MSP432 processors 6.
The overpower protecting, monitoring circuit 11 includes voltage monitoring comparator, the input terminal of the voltage monitoring comparator
The output end of the energy steering circuit 10 is connected, another input terminal of the voltage monitoring comparator connects the second-order filter
The output end of device 3, the output end of the voltage monitoring comparator connect an input terminal of the MSP432 processors 6.
The voltage detecting circuit 7 includes sequentially connected first resistor bleeder circuit 21, first voltage sampling isolator
22, the input terminal of the first resistor bleeder circuit 21 connects the second of the full-wave rectification bridge 2 by the second order filter 3
The output end of pin 23, the first voltage sampling isolator 22 connects the input terminal of the MSP432 processors 6.
The power grid quality detection circuit 8 includes being sequentially connected second resistance bleeder circuit 24, second voltage sampling isolation
Device 25, two input terminals of the second resistance bleeder circuit 24 are separately connected the both ends of the CT electricity getting devices 1.
The both ends of the CT electricity getting devices 1 are separately connected the first pin 26 and third pin 27 of the full-wave rectification bridge 2；Institute
It states the second pin 22 of full-wave rectification bridge 2 and the input terminal of the discharge resistance 14 and described is connected by the second order filter 3
The input terminal of first diode 13；The output end of the discharge resistance 14 connects the input terminal of the metal-oxide-semiconductor 15, the metal-oxide-semiconductor
15 output end connects the 4th pin 28 of the full-wave rectification bridge 2 by the second order filter 3.
Wherein, the discharge resistance 14 is low-resistance high-power resistance, with high-power MOS tube 15, the first capacitance 16, overpower
Protecting, monitoring circuit collectively constitutes power control unit, wherein overpower protecting, monitoring circuit by low power consumption voltage monitoring element and
Compare control supply voltage comparator composition.
The power control process of system includes：
Known first capacitance 16 sets voltage U0, rated voltage Ut, and detect the first capacitance voltage.When its voltage
Less than setting voltage U0When, since the voltage that MSP432 analog samplings interface acquires the first capacitance in real time is system power source voltage；
When its voltage is more than setting voltage U0When, it is more than soft that the analog sampling interface of MSP432 core processing control units, which collects voltage,
The setting value of part, at this moment MSP432 output interface and can output a signal to drive high-power MOS tube to act, subsequent CT rectifications
Short circuit afterwards, electric current are released directly across the first capacitance by high-power resistance.
As shown in figure 4, by boost power supply units, MTTP controllers, the first capacitor charge and discharge administrative unit, DC power supply
Linear transform circuit, backup power supply administrative unit, 2.6V High Temperature Lithium Cells, the first capacitances of 5.5V form power control unit.This
Essential core chip used in unit is ADP5091.ADP5091 provides limited collecting energy (from 16 μ W to 600mW ranges)
Efficient conversion, working loss be Asia μ W ranks.Using internal cold start-up circuit, adjuster can be in the input electricity down to 380mV
Pressure starts.After cold start-up, adjuster can work normally in the input voltage range of 80mV to 3.3V.Additional 150mA
Adjusting output can be programmed by non-essential resistance divider or VID pins.By detecting input voltage, control loop can be by input electricity
Embossing wave is limited in fixed range, to keep stable DC-DC boost conversions.
Under OCV dynamic detections pattern and non-detection pattern, the programming point of adjustment of input voltage allows to carry to the maximum extent
Take the energy of collector.The charging control function of ADP5091/ADP5092 protects chargeable accumulator, and implementation method is by can
Programming charging termination voltage and shutdown discharge voltage monitor cell voltage.
Accurate voltage comparator built in the MTTP controllers takes piezoelectric voltage by control, maintains CT inductive outputs always
Near maximum power point, whole improve takes electric energy power：After energy cell voltage big Mr. Yu's threshold values Un2, start to backup power supply
Charging, is otherwise closed；This components set has minimum startup power supply voltage Un3, and when energy cell voltage is less than Un3, this power supply is not
Start work, it is ensured that take electric CT secondary sides UTake electricityVoltage is higher.
First capacitor charge and discharge administrative unit automatically adjusts charging current method using hardware type, can be according to line load
Size of current and system micropower load state automatically adjust the charging current to the first capacitance, utmostly improve energy
Utilization rate reduces energy fever waste.
Electricity and its measuring system are taken based on the induction of line load electric current second embodiment of the present invention provides a kind of, for current
When the power-supply system defect present situation of the first two distant distribution power automation terminal, gives and promote the design scheme that CT takes electric energy power, provide
Overpower protection circuit, gives energy steering circuit, greatly improves the accommodation of two distant distribution power automation terminals, be
Distribution automation realizes that all standing provides certain technical guarantee.
Embodiment three
A kind of induction based on line load electric current described in the embodiment of the present invention three takes electrical measuring systems, wherein induction CT is adopted
With two coil configuration, embedded one group of Ross coil is used as dedicated current sample, this Rogowski coil is with very high linear
Degree, higher precision, and use sample circuit as shown in Figure 5：And on current transformer pair side and connect a High Precision Low Temperature
Float resistance, to provide residual voltage acquire signaling interface, the circuit mainly include current transformer, precision resistance, linearly every
From circuit, signaling conversion circuit, ADC Acquisition Circuits.
Current transformer module uses dedicated high-precision rogowski coil, has higher sampling linearity, low-power consumption, body
The advantages that product is small, at low cost, the performance with wide temperature range (- 40 DEG C~+70 DEG C) can be very good using outdoors
Overhead transmission line.
Phase-correcting circuit has used the amplifier OPA2333 of high-performance, low cost, this amplifier to have the work(calibrated automatically
Can, extremely low offset voltage (10 μ V, maximum value), while over time with temperature change realize close to zero drift.Together
When also have wide power use scope, it is therefore prevented that due to power supply be mutated caused by measurement accuracy reduction etc. it is a series of unpredictable
Problem, down to the single supply or dual power supply of 1.8V (± 0.9V) and up to 5.5V (± 2.75V).
The use of integrating circuit is the integral to input signal, the elimination of circuit offset voltage and the integral in feedback control
Compensation, uses the high-performance capacitor of NOP materials, has very high temperature characterisitic, capacitance occurs with positive and negative temperature change
Drift.It is illustrated in figure 6 the circuit diagram of the integrating circuit.This circuit is primarily to ensure the complete of sampled analogue signals
Property.R in figurefIt is integrator drift bleeder resistance, for preventing the saturation caused by integrator drift or cut off phenomenon, R4It needs to be more than
Equal to 10R1, L2 connects with R4's for obtaining more accurate output signal, it is therefore an objective to have preferable signal integrity.
The use of block isolating circuit ensure that the accuracy of output end voltage biasing.
The use of signal amplification circuit, this circuit is in order to ensure that the amplitude of output signal is full scale, so as to rear end ADC
The accuracy of circuit sampling, which use high-precision, the amplifier OPA2333 of low-power consumption.
ADC Acquisition Circuits have used two rank RC filter circuits, ensure that integrality, the workability of amplifier output signal,
The material of the capacitance wherein used is NOP materials, and it is low temperature ticket that resistance, which uses, ensure that the accuracy of sampling.
In conclusion the embodiment of the present invention, by using programmable ADP5091 multichannels power management chip, collection CT takes
Electric pressure point of maximum efficiency tracks (MTTP), and backup battery, super capacitance management are in one, intelligent power switching management；Built-in one
Secondary property large capacity, the lithium thionyl chloride cell of long-life and high-performance charge super capacitance, can connect within the scope of 3~630A of circuit
It is continuous to take electricity, circuit 5A that meet product capacity operation, it is greatly carried without battery to effectively extend life of product
The high accommodation of two distant distribution power automation terminals.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can
It is realized by the mode of software plus required general hardware platform.Based on this understanding, technical scheme of the present invention essence
On in other words the part that contributes to existing technology can be expressed in the form of software products, the computer software product
It can be stored in a storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are used so that a computer equipment
(can be personal computer, server either network equipment etc.) executes the certain of each embodiment of the present invention or embodiment
Method described in part.
One of ordinary skill in the art will appreciate that：The component in device in the embodiment of the present invention can be according to embodiment
Description be distributed in the device of embodiment, respective change can also be carried out and be located at one or more dresses different from the present embodiment
In setting.The component of above-described embodiment can be merged into a component, can also be further split into multiple subassemblies.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (8)
1. a kind of induction based on line load electric current takes electrical measuring systems, it is characterised in that：Electricity is taken including sequentially connected CT
Device (1), full-wave rectification bridge (2), second order filter (3), system protection circuit (4), MPPT controller (5), MSP432 processors
(6)；One output end of the second order filter (3) is connected with the input terminal of a voltage detecting circuit (7), the voltage detecting electricity
The output end on road (7) connects an input terminal of the MSP432 processors (6)；The secondary output of the CT electricity getting devices (1) connects
There are the input terminal of power grid quality detection circuit (8), the output end of the power grid quality detection circuit (8) to connect at the MSP432
Manage the input terminal of device (6).
2. the induction according to claim 1 based on line load electric current takes electrical measuring systems, it is characterised in that：The system
Blanket insurance protection circuit (4) includes battery management system (9), energy steering circuit (10), overpower protecting, monitoring circuit (11), battery
Voltage sampling circuit (12), the first diode (13), discharge resistance (14), metal-oxide-semiconductor (15) and the first capacitance (16) composition；
The anode of first diode (13) connects an output end of the second order filter (3), first diode
(13) cathode is separately connected the input terminal of one end and the energy steering circuit (10) of first capacitance (16), and described
The other end of one capacitance (16) connects the MPPT controller (5)；
The output end of the energy steering circuit (10) is separately connected the input terminal of the MPPT controller (5) and the overpower
One output end of the input terminal of protecting, monitoring circuit (11), the overpower protecting, monitoring circuit (11) connects the MPPT controls
Another output end of another input terminal of device (5), the overpower protecting, monitoring circuit (11) connects the MSP432 processors
(6) a input terminal；
The input terminal of the discharge resistance (14) connects an output end of the second order filter (3), the discharge resistance (14)
Output end connect the source electrode of the metal-oxide-semiconductor (15), the drain electrode of the metal-oxide-semiconductor (15) connects the defeated of the second order filter (3)
Enter end, the grid of the metal-oxide-semiconductor (15) connects an input terminal of the MSP432 processors (6)；
The battery management system (9) is parallel with the second capacitance (17), and one end of second capacitance (17) connects the two or two pole
The cathode of (18) is managed, the anode of second diode (18) connects the cathode of first diode (13), second electricity
The other end for holding (17) connects the input terminal of the second order filter (3)；
One output end of the battery management system (9) connects the input terminal of the battery voltage sampling circuit (12), the electricity
Another output end that pond manages system (9) passes through the input of first switch (19) the connection system capacity control circuit (10)
End, the first switch (19) also connect one end of first capacitance (16), the cell voltage by second switch (20)
The output end of sample circuit (12) connects an input terminal of the MSP432 processors (6).
3. the induction according to claim 2 based on line load electric current takes electrical measuring systems, it is characterised in that：The mistake
Power protecting, monitoring circuit (11) includes voltage monitoring comparator, and the input terminal of the voltage monitoring comparator connects the energy
Another input terminal of the output end of control circuit (10), the voltage monitoring comparator connects the defeated of the second order filter (3)
Outlet, the output end of the voltage monitoring comparator connect an input terminal of the MSP432 processors (6).
4. the induction according to claim 3 based on line load electric current takes electrical measuring systems, it is characterised in that：The electricity
Pressure detection circuit (7) includes sequentially connected first resistor bleeder circuit (21), first voltage sampling isolator (22), and described the
The input terminal of one resistor voltage divider circuit (21) connects the second pipe of the full-wave rectification bridge (2) by the second order filter (3)
The output end of foot (23), the first voltage sampling isolator (22) connects the input terminal of the MSP432 processors (6).
5. the induction according to claim 4 based on line load electric current takes electrical measuring systems, it is characterised in that：The electricity
Net quality detection circuitry (8) includes being sequentially connected second resistance bleeder circuit (24), second voltage sampling isolator (25), described
Two input terminals of second resistance bleeder circuit (24) are separately connected the both ends of the CT electricity getting devices (1).
6. the induction according to claim 5 based on line load electric current takes electrical measuring systems, it is characterised in that：The CT
The both ends of electricity getting device (1) are separately connected the first pin (26) and third pin (27) of the full-wave rectification bridge (2)；The all-wave
The second pin (22) of rectifier bridge (2) connects input terminal and the institute of the discharge resistance (14) by the second order filter (3)
State the input terminal of the first diode (13)；The output end of the discharge resistance (14) connects the input terminal of the metal-oxide-semiconductor (15), institute
The output end for stating metal-oxide-semiconductor (15) connects the 4th pin (28) of the full-wave rectification bridge (2) by the second order filter (3).
7. the induction according to claim 6 based on line load electric current takes electrical measuring systems, it is characterised in that：CT takes electricity
It is connected with relay protector between device (1) and the MSP432 processors (6).
8. the induction according to claim 7 based on line load electric current takes electrical measuring systems, it is characterised in that：The CT
Electricity getting device is made of nanocrystalline material coil, using double opening structures.
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| CN201810716527.2A CN108593993B (en) | 2018-07-03 | 2018-07-03 | Inductive electricity acquisition measuring system based on line load current |
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| CN108593993B (en) | 2024-06-18 |
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