CN110208597A - A kind of self-power wireless current monitoring system based on simplex winding current transformer - Google Patents
A kind of self-power wireless current monitoring system based on simplex winding current transformer Download PDFInfo
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- 238000004804 winding Methods 0.000 title claims abstract description 44
- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 238000004146 energy storage Methods 0.000 claims abstract description 94
- 238000005070 sampling Methods 0.000 claims abstract description 61
- 230000003750 conditioning effect Effects 0.000 claims abstract description 47
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 65
- 230000005611 electricity Effects 0.000 claims description 20
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 14
- 229910052744 lithium Inorganic materials 0.000 claims description 14
- 230000009466 transformation Effects 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 102220007331 rs111033633 Human genes 0.000 description 1
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- 238000004088 simulation Methods 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
- G01R15/14—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
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
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- 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
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H02J5/005—
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- H02J7/025—
Abstract
The invention discloses a kind of self-power wireless current monitoring systems based on simplex winding current transformer, including acquisition elements and observation circuit, observation circuit includes filter rectification and current sampling module, charge control and energy-storage module, signal conditioning module, microcontroller and wireless transmitter module, acquisition elements generate alternating current and export to filter rectification and current sampling module, filter rectification and current sampling module generate DC voltage and the output of two-way analog voltage signal, charge control and energy-storage module are signal conditioning module, microcontroller and wireless transmitter module power supply, signal conditioning module obtains analog voltage signal all the way after handling two-way analog voltage signal and exports to microcontroller, microcontroller monitoring control charge control and energy-storage module charging, and it generates current monitor signal and is sent to wireless transmitter module progress wireless transmission；Advantage is the simplex winding current transformer using a routine while carrying out electric energy acquisition and current sense, and cost is relatively low, and small volume.
Description
Technical field
The present invention relates to a kind of self-power wireless current monitoring systems, are based on simplex winding Current Mutual Inductance more particularly, to one kind
The self-power wireless current monitoring system of device.
Background technique
Currently, generalling use the Current Mutual Inductance based on electromagnetic induction principle when measuring to electric system high current
Device realizes that its primary side high current is converted into secondary side low current by current transformer, then pass through cable by secondary meter
Acquire Current Transformer Secondary side low current.With the development of technology of wireless sensing network, energy monitoring apparatus also gradually tends to
Wireless penetration direction is developed, and wireless current monitoring system comes into being.Wireless current monitoring system may be implemented to electric system electricity
The long distance wireless real-time monitoring of stream, is widely used.
Existing wireless current monitoring system mainly includes acquisition elements and observation circuit, and wherein acquisition elements are that electric current is mutual
Sensor, observation circuit are made of active devices such as microcontroller and wireless transmitter modules.Current transformer is a kind of passive device,
Its course of work needs not rely on external power supply, but constitutes the active devices such as microcontroller and the wireless transmitter module of observation circuit
Part, the course of work are needed by external power supply.Currently, providing the scheme of power supply in wireless current monitoring system for observation circuit
There are mainly two types of: the first scheme is to use additional dry cell for the confession of the active devices such as microcontroller and wireless transmitter module
Electricity, dry cell cruise duration is limited in the program, leads to dry cell replacement frequently, also, for being mounted on remote districts and embedding
For entering the equipment in formula environment, dry cell replacement cost is high or even can not replace；Second scheme is based on Current Mutual Inductance
The electromagnetic induction principle of device obtains electric energy from current transformer primary side, but current transformer output is alternating current, and micro-
The active devices such as controller and wireless transmitter module need stable DC, it is therefore desirable to design corresponding conversion circuit.
In recent years, the electric energy supply problem of wireless current monitoring system has obtained extensive research.Application No. is
Disclose that a kind of to be arranged with detection current in parallel on the line mutual in the Chinese patent of CN201480008160.9
The current transformation system and net is managed it by wireless communication integrated system of sensor and the Current Transformer that generates electricity.It should
Scheme solves the electric energy supply problem of wireless current monitoring system by the self-powered of wireless current monitoring system.But by
It is independent from each other in the current monitoring circuit of the program with electric energy acquisition circuit, the implementation of scheme is caused to need using two lists
Winding current transformer, one of simplex winding current transformer are used for electric energy acquisition, another simplex winding current transformer is used
In current sense, the volume of equipment is thus not only increased, also increases the application cost of scheme.Application No. is
A kind of passive and wireless current sense based on double-winding current mutual inductor is disclosed in the Chinese patent of CN201811490262.5
Device, the program solve the electric energy supply problem of wireless current monitoring system also by the self-powered of wireless current monitoring system.
But the current monitoring circuit due to the program is also independent from each other with electric energy acquisition circuit, thus in the implementation of the program
Using a double-winding current mutual inductor, wherein double-winding current mutual inductor a winding is used for electric energy acquisition, another around
Group is used for current sense.However, double-winding current mutual inductor is costly compared to simplex winding current transformer price, therefore the party
Case will greatly increase application cost.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of, and the self-power wireless based on simplex winding current transformer is electric
Monitoring system is flowed, which carries out electric energy using the simplex winding current transformer of a routine simultaneously
Acquisition and current sense, cost is relatively low, and small volume.
The technical scheme of the invention to solve the technical problem is: it is a kind of based on simplex winding current transformer from
Powered, wireless electric current monitors system, including acquisition elements and observation circuit, the acquisition elements using routine it is single around
Group current transformer realizes, the observation circuit include filter rectification and current sampling module, charge control and energy-storage module,
Signal conditioning module, microcontroller and wireless transmitter module；The simplex winding current transformer is for incuding cable under test
In alternating current after its second siding ring generate alternating current export to the filter rectification and current sampling module, institute
The filter rectification and current sampling module stated generate direct current after on the one hand the alternating current inputted in it is first filtered, rectified again
Pressure is output in the charge control and energy-storage module, on the other hand the positive half cycle to the alternating current inputted in it and negative half
Week is sampled to obtain two sampled signals respectively, and two sampled signals are converted into two-way analog voltage signal and are exported to institute
The signal conditioning module stated, the charge control and energy-storage module are the signal conditioning module, the microcontroller
Power with the wireless transmitter module, the signal conditioning module to the two-way analog voltage signal inputted in it successively into
Analog voltage signal all the way is generated after row differential amplification, direct current biasing and impedance transformation to export to the microcontroller, it is described
Microcontroller on the one hand monitor the voltage of the charge control and energy-storage module, in the charge control and energy-storage module
Charging controls it when unsaturated and charges, and is on the other hand counted the analog voltage signal inputted in it progress analog-to-digital conversion
Word signal passes to the wireless transmitter module and carries out wireless transmission after then being handled the digital signal.
The filter rectification and current sampling module has first input end, the second input terminal, positive sampled output, bears
Sampled output and DC voltage output end, the charge control and energy-storage module have input terminal, the first control terminal, second
Control terminal, positive voltage output end and negative voltage output end, the microcontroller have input terminal, the first control terminal, the second control
End processed and output end, the signal conditioning module have positive input terminal, negative input end and output end, the filter rectification and
The first input end of current sampling module is connected with one end of the second siding ring of the simplex winding current transformer, described
The second siding ring of the second input terminal and the simplex winding current transformer of filter rectification and current sampling module it is another
End connection, the DC voltage output end and the charge control and energy-storage module of the filter rectification and current sampling module
Input terminal connection, the positive sampled output and the signal conditioning module of the filter rectification and current sampling module
Positive input terminal connection, the negative sampled output and the signal conditioning module of the filter rectification and current sampling module
Negative input end connection, the output end of the signal conditioning module are connected with the input terminal of the microcontroller, and described is micro-
The output end of controller is connected with the wireless transmitter module, the first control terminal and the charging of the microcontroller
The connection of first control terminal of control and energy-storage module, the second control terminal of the microcontroller and the charge control and storage
The second control terminal connection of energy module, the positive voltage output end and negative voltage output end of the charge control and energy-storage module are defeated
Positive and negative two-way supply voltage is supplied to the signal conditioning module, the microcontroller and the wireless transmitter module out
Electricity, when the charge control and energy-storage module are in default conditions, the first control of the charge control and energy-storage module
The voltage at end processed is pulled down to by the microcontroller refers to ground, the second control terminal of the charge control and energy-storage module
Voltage is pulled to high level, the direct current that the charge control and energy-storage module access its input terminal by the microcontroller
Voltage charges after carrying out voltage transformation, and the microcontroller carries out electricity in real time to the charge control and energy-storage module
Pressure monitoring, when detecting the charge control and energy-storage module charging saturation, the first control terminal of the microcontroller
High level is exported, the voltage high level of first control terminal of charge control and energy-storage module, the microcontroller are made
The second control terminal export low level, make the voltage low level of second control terminal of charge control and energy-storage module, this
The charge control and energy-storage module of Shi Suoshu stops charging.
The filter rectification and current sampling module include first capacitor, the second capacitor, the first inductance, the second inductance,
First resistor, second resistance, 3rd resistor, the 4th resistance, first diode, the second diode, third diode and the four or two
Pole pipe；One end of the first capacitor, first inductance one end connected with one end of the first resistor and its
Connecting pin is the first input end of the filter rectification and current sampling module, one end of second capacitor, described
One end of second inductance is connected with one end of the second resistance and its connecting pin is the filter rectification and current sample
Second input terminal of module, the other end of first inductance, the other end of the first resistor, the one or two pole
The anode of pipe connects with the cathode of the third diode, the other end of second inductance, the second resistance
The other end, second diode anode connected with the cathode of the 4th diode, the first diode
Cathode is connect with the cathode of second diode and its connecting pin is the straight of the filter rectification and current sampling module
Voltage output end is flowed, the anode of the third diode is connect with one end of the 3rd resistor and its connecting pin is described
Filter rectification and current sampling module positive sampled output, anode and the 4th resistance of the 4th diode
One end connection and its connecting pin be the filter rectification and current sampling module negative sampled output, described first electricity
The other end of appearance, the other end of second capacitor, the other end of the 3rd resistor and the 4th resistance it is another
One end connection and its connecting pin are the ground terminal of the filter rectification and current sampling module, the filter rectification and electric current
The ground terminal of sampling module is connect with reference.The filter rectification and current sampling module pass through the input in full bridge rectifier
Two groups of LC filter circuits (one group of LC filter circuit and the second electricity of the first inductance and first capacitor composition is symmetrical arranged in channel
One group of LC filter circuit of sense and the second capacitor), and concatenate a sampling respectively in two bridge arms of full bridge rectifier
Resistance (3rd resistor and the 4th resistance), to realize that three kinds of filtering, rectification and current sample functions in one, are conducive to reduce
Circuit volume.
The charge control and energy-storage module include the first NMOS tube, third inductance, the 5th diode, third capacitor,
4th capacitor, the 5th capacitor, the 6th capacitor, the first voltage-stabiliser tube, DC-DC DC converter, lithium battery, positive voltage linear voltage regulator
With negative voltage linear voltage regulator；The DC-DC DC converter has input, output end, control terminal and ground terminal, described
The first NMOS tube drain electrode and the 5th diode anode connection and its connecting pin be the charge control and storage
Can module input terminal, the cathode of the 5th diode, one end of the third capacitor, first voltage-stabiliser tube
Cathode is connected with the input terminal of the DC-DC DC converter, the output end of the DC-DC DC converter, described
The anode of lithium battery is connected with one end of the third inductance, the other end of the third inductance, the 4th capacitor
One end, the positive voltage linear voltage regulator input terminal connected with the negative voltage linear voltage regulator input terminal, it is described
Positive voltage linear voltage regulator output end connect with one end of the 5th capacitor and its connecting pin be the charging control
The one of the positive voltage output end of system and energy-storage module, the output end of the negative voltage linear voltage regulator and the 6th capacitor
End connection and its connecting pin are the negative voltage output end of the charge control and energy-storage module, the source of first NMOS tube
Pole, the other end of the third capacitor, first voltage-stabiliser tube positive, described DC-DC DC converter ground connection
End, the cathode of the lithium battery, the other end of the 4th capacitor, the positive voltage linear voltage regulator ground terminal,
The other end of the ground terminal of the negative voltage linear voltage regulator, the other end of the 5th capacitor and the 6th capacitor
Connection and its connecting pin are the ground terminal of the charge control and energy-storage module, and the charge control and energy-storage module connect
Ground terminal is connect with reference, and the grid of first NMOS tube is the first control of the charge control and energy-storage module
End, the control terminal of the DC-DC DC converter are the second control terminal of the charge control and energy-storage module.
The signal conditioning module includes the first operational amplifier, second operational amplifier, third operational amplifier, the
Five resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor,
13 resistance, the 14th resistance and the 7th capacitor；First operational amplifier, the second operational amplifier and described
Third operational amplifier be respectively provided with positive input terminal, negative input end, output end, positive power source terminal and negative power end, described
One end of five resistance is the positive input terminal of the signal conditioning module, the other end of the 5th resistance, described first
The positive input terminal of operational amplifier is connected with one end of the 6th resistance, and one end of the 7th resistance is the letter
The negative input end of number conditioning module, the other end of the 7th resistance, the negative input end of first operational amplifier and
One end of 8th resistance connects, the output end of the other end of the 8th resistance, first operational amplifier
It is connected with one end of the eleventh resistor, the other end of the eleventh resistor, the second operational amplifier
Negative input end is connected with one end of the twelfth resistor, the other end of the twelfth resistor, second operation
The output end of amplifier is connected with the positive input terminal of the third operational amplifier, one end of the 9th resistance, described
The positive power source terminal of the first operational amplifier, the positive power source terminal of the second operational amplifier and the third operation amplifier
The positive power source terminal of device connects and its connecting pin is connect with the positive voltage output end of the charge control and energy-storage module, described
The negative power end and the third operational amplifier of the negative power end of first operational amplifier, the second operational amplifier
Negative power end connection and its connecting pin connect with the negative voltage output end of the charge control and energy-storage module, described the
The other end of nine resistance, the second operational amplifier positive input terminal connected with one end of the tenth resistance, it is described
One end of thirteenth resistor connect with the negative input end of the third operational amplifier, the thirteenth resistor it is another
It holds, the output end of the third operational amplifier is connected with one end of the 14th resistance, the 14th resistance
The other end connect with one end of the 7th capacitor and its connecting pin be the signal conditioning module output end, it is described
The other end of the 6th resistance, the other end of the tenth resistance and the 7th capacitor the other end with reference even
It connects.
Compared with the prior art, the advantages of the present invention are as follows by filter rectification and current sampling module, charge control and
Energy-storage module, signal conditioning module, microcontroller and wireless transmitter module constitute observation circuit, using the list of a routine
Winding current transformer realizes electric energy acquisition and current sense simultaneously, and simplex winding current transformer incudes primary side electricity to be measured at this time
After alternating current in cable, according to Faraday's law of induction, alternating current will be induced in the second siding ring of its closure, from
And generate alternating current and export to filter rectification and current sampling module, filter rectification and current sampling module are on the one hand to input
Alternating current in it generates direct voltage output into charge control and energy-storage module after first filtering, rectify again, on the other hand
Positive half cycle and negative half period to the alternating current inputted in it are sampled to obtain two sampled signals respectively, and two are sampled
Signal is converted into two-way analog voltage signal and exports to signal conditioning module, and charge control and energy-storage module are signal condition mould
Block, microcontroller and wireless transmitter module power supply, signal conditioning module to input its in two-way analog voltage signal successively into
Analog voltage signal all the way is generated after row differential amplification, direct current biasing and impedance transformation to export to microcontroller, microcontroller one
Aspect monitors the voltage of charge control and energy-storage module, controls it in charge control and unsaturated energy-storage module charging and is filled
On the other hand the analog voltage signal inputted in it progress analog-to-digital conversion is obtained digital signal, then by the digital signal by electricity
Wireless transmitter module is passed to after being handled and carries out wireless transmission, and thus the present invention is mutual using the simplex winding electric current of a routine
Sensor carries out electric energy acquisition and current sense simultaneously, has not both needed the quantity for increasing current transformer, and also not needing to use has
The high price current transformer of multiple second siding ring windings, circuit structure is simple, and cost is relatively low, and small volume.
Detailed description of the invention
Fig. 1 is the structure chart of the self-power wireless current monitoring system of the invention based on simplex winding current transformer；
Fig. 2 be the self-power wireless current monitoring system of the invention based on simplex winding current transformer filter rectification and
The circuit diagram of current sampling module；
Fig. 3 be the self-power wireless current monitoring system of the invention based on simplex winding current transformer charge control and
The circuit diagram of energy-storage module；
Fig. 4 is the signal condition mould of the self-power wireless current monitoring system of the invention based on simplex winding current transformer
The circuit diagram of block.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment one: as shown in Figure 1, a kind of self-power wireless current monitoring system based on simplex winding current transformer,
Including acquisition elements and observation circuit, acquisition elements are realized using the simplex winding current transformer 1 of a routine, observation circuit packet
Include filter rectification and current sampling module 2, charge control and energy-storage module 3, signal conditioning module 4, microcontroller 5 and wireless
Transmitting module 6；Simplex winding current transformer 1 is handed over after being used to incude the alternating current in cable under test in the generation of its second siding ring
Galvanic electricity stream is exported to filter rectification and current sampling module 2, and filter rectification and 2 one side of current sampling module are to inputting in it
Alternating current generates direct voltage output into charge control and energy-storage module 3 after first filtering, rectify again, on the other hand to input
The positive half cycle and negative half period of alternating current in it are sampled to obtain two sampled signals respectively, and two sampled signals are turned
It changes two-way analog voltage signal into export to signal conditioning module 4, charge control and energy-storage module 3 be signal conditioning module 4, micro-
Controller 5 and wireless transmitter module 6 are powered, and 4 pairs of the signal conditioning module two-way analog voltage signals inputted in it successively carry out
Analog voltage signal all the way is generated after differential amplification, direct current biasing and impedance transformation to export to microcontroller 5, microcontroller 5 one
Aspect monitors the voltage of charge control and energy-storage module 3, controls its progress when charge control and energy-storage module 3 charge unsaturation
On the other hand the analog voltage signal inputted in it progress analog-to-digital conversion is obtained digital signal, then believes the number by charging
Wireless transmitter module 6 is passed to after number being handled carries out wireless transmission.
In the present embodiment, filter rectification and current sampling module 2 have first input end, the second input terminal, just sampling it is defeated
Outlet, negative sampled output and DC voltage output end, charge control and energy-storage module 3 have input terminal, the first control terminal, the
Two control terminals, positive voltage output end and negative voltage output end, microcontroller 5 have input terminal, the first control terminal, the second control terminal
And output end, signal conditioning module 4 have positive input terminal, negative input end and output end, filter rectification and current sampling module 2
First input end is connected with one end of the second siding ring of simplex winding current transformer 1, filter rectification and current sampling module 2
Second input terminal is connected with the other end of the second siding ring of simplex winding current transformer 1, filter rectification and current sampling module 2
DC voltage output end connected with the input terminal of charge control and energy-storage module 3, filter rectification and current sampling module 2 are just
Sampled output is connected with the positive input terminal of signal conditioning module 4, the negative sampled output of filter rectification and current sampling module 2
It is connected with the negative input end of signal conditioning module 4, the output end of signal conditioning module 4 is connected with the input terminal of microcontroller 5, micro-
The output end and wireless transmitter module 6 of controller 5 connect, the first control terminal and charge control and energy-storage module 3 of microcontroller 5
The connection of the first control terminal, the second control terminal of microcontroller 5 connects with the second control terminal of charge control and energy-storage module 3,
The positive voltage output end and negative voltage output end of charge control and energy-storage module 3 export positive and negative two-way supply voltage to signal condition
Module 4, microcontroller 5 and wireless transmitter module 6 are powered, and when charge control and energy-storage module 3 be in default conditions, charging is controlled
The voltage of system and the first control terminal of energy-storage module 3 is pulled down to by microcontroller 5 with reference to ground, charge control and energy-storage module 3
The voltage of second control terminal by microcontroller 5 be pulled to high level, charge control and energy-storage module 3 its input terminal is accessed it is straight
Galvanic electricity pressure charges after carrying out voltage transformation, and microcontroller 5 carries out real-time voltage monitoring to charge control and energy-storage module 3,
When detecting charge control and the charging saturation of energy-storage module 3, the first control terminal of microcontroller 5 exports high level, makes to charge
The voltage of control and 3 first control terminal of energy-storage module is high level, and the second control terminal of microcontroller 5 exports low level, makes to fill
The voltage of 3 second control terminal of electric control and energy-storage module is that low level, at this time charge control and energy-storage module 3 stop charging.
Embodiment two: the present embodiment is basically the same as the first embodiment, and difference is as described below:
As shown in Fig. 2, filter rectification and current sampling module 2 include first capacitor C1, the second capacitor in the present embodiment
C2, the first inductance L1, the second inductance L2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the one or two pole
Pipe D1, the second diode D2, third diode D3 and the 4th diode D4；One end of first capacitor C1, the first inductance L1 one
End connect with one end of first resistor R1 and its connecting pin is the first input end of filter rectification and current sampling module 2, and second
One end of capacitor C2, the second inductance L2 one end connected with one end of second resistance R2 and its connecting pin be filter rectification and electric current
Second input terminal of sampling module 2, the other end of the first inductance L1, the other end of first resistor R1, first diode D1 are just
Pole is connected with the cathode of third diode D3, the other end of the second inductance L2, the other end of second resistance R2, the second diode D2
Anode connected with the cathode of the 4th diode D4, the cathode of first diode D1 is connect with the cathode of the second diode D2 and it
Connecting pin is the DC voltage output end of filter rectification and current sampling module 2, the anode and 3rd resistor of third diode D3
One end of R3 connects and its connecting pin is the positive sampled output of filter rectification and current sampling module 2, the 4th diode D4's
Anode is connect with one end of the 4th resistance R4 and its connecting pin is the negative sampled output of filter rectification and current sampling module 2,
The other end of first capacitor C1, the other end of the second capacitor C2, the other end of 3rd resistor R3 and the 4th resistance R4 the other end
Connection and its connecting pin are the ground terminal of filter rectification and current sampling module 2, the ground connection of filter rectification and current sampling module 2
End is connect with reference.
As shown in figure 3, in the present embodiment, charge control and energy-storage module 3 include the first NMOS tube M1, third inductance L3,
5th diode D5, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6, first voltage-stabiliser tube ZD1, DC-DC
DC converter, lithium battery BAT, positive voltage linear voltage regulator and negative voltage linear voltage regulator；DC-DC DC converter has defeated
Enter end, output end, control terminal and ground terminal, the drain electrode of the first NMOS tube M1 and the anode of the 5th diode D5 connect and it is connected
End is the input terminal of charge control and energy-storage module 3, the cathode of the 5th diode D5, one end of third capacitor C3, the first pressure stabilizing
The cathode of pipe ZD1 is connected with the input terminal of DC-DC DC converter, the output end of DC-DC DC converter, lithium battery BAT
Anode is connected with one end of third inductance L3, the other end of third inductance L3, one end of the 4th capacitor C4, positive voltage linear voltage stabilization
The input terminal of device is connected with negative voltage linear voltage regulator input terminal, the output end of positive voltage linear voltage regulator and the 5th capacitor C5's
One end connection and its connecting pin are the positive voltage output end of charge control and energy-storage module 3, the output of negative voltage linear voltage regulator
End is connect with one end of the 6th capacitor C6 and its connecting pin is the negative voltage output end of charge control and energy-storage module 3, and first
The ground connection of the source electrode of NMOS tube M1, the other end of third capacitor C3, the anode of the first voltage-stabiliser tube ZD1, DC-DC DC converter
End, the cathode of lithium battery BAT, the other end of the 4th capacitor C4, the ground terminal of positive voltage linear voltage regulator, negative voltage linear voltage stabilization
The other end of the ground terminal of device, the other end of the 5th capacitor C5 and the 6th capacitor C6 connects and its connecting pin is charge control and storage
The ground terminal of the ground terminal of energy module 3, charge control and energy-storage module 3 is connect with reference, and the grid of the first NMOS tube M1 is
First control terminal of charge control and energy-storage module 3, the control terminal of DC-DC DC converter are charge control and energy-storage module 3
The second control terminal.
As shown in figure 4, signal conditioning module 4 includes the first operational amplifier OP1, the second operation amplifier in the present embodiment
Device OP2, third operational amplifier OP3, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14 and the 7th
Capacitor C7；First operational amplifier OP1, second operational amplifier OP2 and third operational amplifier OP3 are respectively provided with positive input
End, negative input end, output end, positive power source terminal and negative power end, one end of the 5th resistance R5 are the positive input of signal conditioning module 4
End, one end connection of the other end of the 5th resistance R5, the positive input terminal of the first operational amplifier OP1 and the 6th resistance R6, the 7th
One end of resistance R7 is the negative input end of signal conditioning module 4, the other end of the 7th resistance R7, the first operational amplifier OP1
One end of negative input end and the 8th resistance R8 connection, the other end of the 8th resistance R8, the output end of the first operational amplifier OP1 and
One end of eleventh resistor R11 connects, the other end of eleventh resistor R11, the negative input end of second operational amplifier OP2 and the
One end of 12 resistance R12 connects, the other end of twelfth resistor R12, the output end of second operational amplifier OP2 and third fortune
Calculate the positive input terminal connection of amplifier OP3, one end of the 9th resistance R9, the positive power source terminal of the first operational amplifier OP1, the second fortune
Calculate the positive power source terminal connection of the positive power source terminal and third operational amplifier OP3 of amplifier OP2 and its connecting pin and charge control and
The positive voltage output end of energy-storage module 3 connects, the negative power end of the first operational amplifier OP1, second operational amplifier OP2 it is negative
The negative electricity of the connection of the negative power end of power end and third operational amplifier OP3 and its connecting pin and charge control and energy-storage module 3
Press output end connection, the one of the other end of the 9th resistance R9, the positive input terminal of second operational amplifier OP2 and the tenth resistance R10
End connection, one end of thirteenth resistor R13 are connect with the negative input end of third operational amplifier OP3, and thirteenth resistor R13's is another
One end of one end, the output end of third operational amplifier OP3 and the 14th resistance R14 connects, the other end of the 14th resistance R14
It is connect with one end of the 7th capacitor C7 and its connecting pin is the output end of signal conditioning module 4, the other end of the 6th resistance R6, the
The other end of ten resistance R10 and the other end of the 7th capacitor C7 with reference are connect.
Further, on resistance value, R3=R4, R5=R7, R6=R8, R9=R11=2*R10=2*R12 then believe
The voltage signal that number conditioning module 4 exports is Vadc=R8/R7*R12/R11*R4*Is+0.5*Vcc, wherein R3 indicates third electricity
The resistance value of R3 is hindered, R4 indicates the resistance value of the 4th resistance R4, and R5 indicates the resistance value of the 5th resistance R5, and R6 indicates the resistance of the 6th resistance R6
Value, R7 indicate the resistance value of the 7th resistance R7, and R8 indicates the resistance value of the 8th resistance R8, and R9 indicates the resistance value of the 9th resistance R9, R10 table
Show the resistance value of the tenth resistance R10, R11 indicates the resistance value of eleventh resistor R11, and R12 indicates the resistance value of twelfth resistor R12, Vcc
Indicate the positive voltage of the positive voltage output end output of charge control and energy-storage module 3, IsIndicate the of simplex winding current transformer 1
The electric current of one output end output.
The specific work process of the self-power wireless current monitoring system based on simplex winding current transformer of the present embodiment
Are as follows: the alternating current I being input in filter rectification and current sampling module 2s, first by the first inductance L1, first capacitor C1,
Two groups of LC filters that two inductance L2, the second capacitor C2 are constituted carry out low-pass filtering and improve signal-to-noise ratio；Then, on the one hand by first
The full bridge rectifier that diode D1, the second diode D2, third diode D3, the 4th diode D4 are constituted carries out rectification generation
DC voltage VrIt is output in charge control and energy-storage module 3, on the other hand by being serially connected in two bridge arms of full bridge rectifier
3rd resistor R3, the 4th resistance R4 the positive half cycle to input AC electric current and negative half period are sampled to obtain two-way simulation respectively
Voltage signal V+And V?It exports in signal conditioning module 4；Lithium battery BAT of the microcontroller 5 to charge control and energy-storage module 3
Electricity is monitored, and when lithium battery BAT not enough power supply, microcontroller 5 controls VshtFor high level and VenWhen for high level, directly
Galvanic electricity presses VrDC-DC DC converter U1 is inputed to carry out voltage transformation and charge to lithium battery BAT；When lithium battery BAT electricity
When saturation, microcontroller 5 controls VshtFor low level and VenWhen for low level, DC voltage Vr is pulled down to reference to ground, simultaneously
DC-DC DC converter U1 stops working, and lithium battery BAT stops charging；In signal conditioning module 4, first by the first operation
Two-way current sampling signal V of the amplifier OP1 to input+And V?Bipolar analog voltage letter all the way is generated after carrying out differential amplification
Number, unipolarity all the way is generated after then carrying out direct current biasing to the bipolar analog voltage signal by second operational amplifier OP2
Analog voltage signal exports after finally carrying out voltage follow to the unipolarity analog voltage signal by third operational amplifier OP3
Low-impedance unipolarity analog voltage signal V all the wayadcTo microcontroller 5, microcontroller 5 is to input analog voltage signal Vadc
It carries out analog-to-digital conversion and obtains digital signal, wireless transmitter module 6 is passed to after then being handled the digital signal and carries out nothing
Line transmitting.
Claims (5)
1. a kind of self-power wireless current monitoring system based on simplex winding current transformer, including acquisition elements and monitoring electricity
Road, it is characterised in that simplex winding current transformer realization of the acquisition elements using a routine, the observation circuit
Including filter rectification and current sampling module, charge control and energy-storage module, signal conditioning module, microcontroller and wireless hair
Penetrate module；The simplex winding current transformer generates after being used to incude the alternating current in cable under test in its second siding ring
Alternating current is exported to the filter rectification and current sampling module, and the filter rectification and current sampling module are on the one hand
Direct voltage output is generated after the alternating current inputted in it is first filtered, rectified again to the charge control and energy-storage module
In, on the other hand the positive half cycle and negative half period of the alternating current inputted in it are sampled to obtain two sampled signals respectively,
And two sampled signals are converted into two-way analog voltage signal and are exported to the signal conditioning module, the charge control
And energy-storage module is that the signal conditioning module, the microcontroller and the wireless transmitter module are powered, it is described
After signal conditioning module successively carries out differential amplification, direct current biasing and impedance transformation to the two-way analog voltage signal inputted in it
It generates analog voltage signal all the way to export to the microcontroller, on the one hand the microcontroller monitors the charging control
The voltage of system and energy-storage module controls it in the charge control and unsaturated energy-storage module charging and charges, another
The analog voltage signal inputted in it progress analog-to-digital conversion is obtained digital signal by aspect, then handles the digital signal
The wireless transmitter module is passed to afterwards carries out wireless transmission.
2. a kind of self-power wireless current monitoring system based on simplex winding current transformer according to claim 1,
It is characterized in that the filter rectification and current sampling module has first input end, the second input terminal, positive sampled output, bears
Sampled output and DC voltage output end, the charge control and energy-storage module have input terminal, the first control terminal, second
Control terminal, positive voltage output end and negative voltage output end, the microcontroller have input terminal, the first control terminal, the second control
End processed and output end, the signal conditioning module have positive input terminal, negative input end and output end, the filter rectification and
The first input end of current sampling module is connected with one end of the second siding ring of the simplex winding current transformer, described
The second siding ring of the second input terminal and the simplex winding current transformer of filter rectification and current sampling module it is another
End connection, the DC voltage output end and the charge control and energy-storage module of the filter rectification and current sampling module
Input terminal connection, the positive sampled output and the signal conditioning module of the filter rectification and current sampling module
Positive input terminal connection, the negative sampled output and the signal conditioning module of the filter rectification and current sampling module
Negative input end connection, the output end of the signal conditioning module are connected with the input terminal of the microcontroller, and described is micro-
The output end of controller is connected with the wireless transmitter module, the first control terminal and the charging of the microcontroller
The connection of first control terminal of control and energy-storage module, the second control terminal of the microcontroller and the charge control and storage
The second control terminal connection of energy module, the positive voltage output end and negative voltage output end of the charge control and energy-storage module are defeated
Positive and negative two-way supply voltage is supplied to the signal conditioning module, the microcontroller and the wireless transmitter module out
Electricity, when the charge control and energy-storage module are in default conditions, the first control of the charge control and energy-storage module
The voltage at end processed is pulled down to by the microcontroller refers to ground, the second control terminal of the charge control and energy-storage module
Voltage is pulled to high level, the direct current that the charge control and energy-storage module access its input terminal by the microcontroller
Voltage charges after carrying out voltage transformation, and the microcontroller carries out electricity in real time to the charge control and energy-storage module
Pressure monitoring, when detecting the charge control and energy-storage module charging saturation, the first control terminal of the microcontroller
High level is exported, the voltage high level of first control terminal of charge control and energy-storage module, the microcontroller are made
The second control terminal export low level, make the voltage low level of second control terminal of charge control and energy-storage module, this
The charge control and energy-storage module of Shi Suoshu stops charging.
3. a kind of self-power wireless current monitoring system based on simplex winding current transformer according to claim 2,
Be characterized in that the filter rectification and current sampling module include first capacitor, the second capacitor, the first inductance, the second inductance,
First resistor, second resistance, 3rd resistor, the 4th resistance, first diode, the second diode, third diode and the four or two
Pole pipe；One end of the first capacitor, first inductance one end connected with one end of the first resistor and its
Connecting pin is the first input end of the filter rectification and current sampling module, one end of second capacitor, described
One end of second inductance is connected with one end of the second resistance and its connecting pin is the filter rectification and current sample
Second input terminal of module, the other end of first inductance, the other end of the first resistor, the one or two pole
The anode of pipe connects with the cathode of the third diode, the other end of second inductance, the second resistance
The other end, second diode anode connected with the cathode of the 4th diode, the first diode
Cathode is connect with the cathode of second diode and its connecting pin is the straight of the filter rectification and current sampling module
Voltage output end is flowed, the anode of the third diode is connect with one end of the 3rd resistor and its connecting pin is described
Filter rectification and current sampling module positive sampled output, anode and the 4th resistance of the 4th diode
One end connection and its connecting pin be the filter rectification and current sampling module negative sampled output, described first electricity
The other end of appearance, the other end of second capacitor, the other end of the 3rd resistor and the 4th resistance it is another
One end connection and its connecting pin are the ground terminal of the filter rectification and current sampling module, the filter rectification and electric current
The ground terminal of sampling module is connect with reference.
4. a kind of self-power wireless current monitoring system based on simplex winding current transformer according to claim 2,
Be characterized in that the charge control and energy-storage module include the first NMOS tube, third inductance, the 5th diode, third capacitor,
4th capacitor, the 5th capacitor, the 6th capacitor, the first voltage-stabiliser tube, DC-DC DC converter, lithium battery, positive voltage linear voltage regulator
With negative voltage linear voltage regulator；The DC-DC DC converter has input, output end, control terminal and ground terminal, described
The first NMOS tube drain electrode and the 5th diode anode connection and its connecting pin be the charge control and storage
Can module input terminal, the cathode of the 5th diode, one end of the third capacitor, first voltage-stabiliser tube
Cathode is connected with the input terminal of the DC-DC DC converter, the output end of the DC-DC DC converter, described
The anode of lithium battery is connected with one end of the third inductance, the other end of the third inductance, the 4th capacitor
One end, the positive voltage linear voltage regulator input terminal connected with the negative voltage linear voltage regulator input terminal, it is described
Positive voltage linear voltage regulator output end connect with one end of the 5th capacitor and its connecting pin be the charging control
The one of the positive voltage output end of system and energy-storage module, the output end of the negative voltage linear voltage regulator and the 6th capacitor
End connection and its connecting pin are the negative voltage output end of the charge control and energy-storage module, the source of first NMOS tube
Pole, the other end of the third capacitor, first voltage-stabiliser tube positive, described DC-DC DC converter ground connection
End, the cathode of the lithium battery, the other end of the 4th capacitor, the positive voltage linear voltage regulator ground terminal,
The other end of the ground terminal of the negative voltage linear voltage regulator, the other end of the 5th capacitor and the 6th capacitor
Connection and its connecting pin are the ground terminal of the charge control and energy-storage module, and the charge control and energy-storage module connect
Ground terminal is connect with reference, and the grid of first NMOS tube is the first control of the charge control and energy-storage module
End, the control terminal of the DC-DC DC converter are the second control terminal of the charge control and energy-storage module.
5. a kind of self-power wireless current monitoring system based on simplex winding current transformer according to claim 2,
It is characterized in that the signal conditioning module includes the first operational amplifier, second operational amplifier, third operational amplifier, the
Five resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor,
13 resistance, the 14th resistance and the 7th capacitor；First operational amplifier, the second operational amplifier and described
Third operational amplifier be respectively provided with positive input terminal, negative input end, output end, positive power source terminal and negative power end, described
One end of five resistance is the positive input terminal of the signal conditioning module, the other end of the 5th resistance, described first
The positive input terminal of operational amplifier is connected with one end of the 6th resistance, and one end of the 7th resistance is the letter
The negative input end of number conditioning module, the other end of the 7th resistance, the negative input end of first operational amplifier and
One end of 8th resistance connects, the output end of the other end of the 8th resistance, first operational amplifier
It is connected with one end of the eleventh resistor, the other end of the eleventh resistor, the second operational amplifier
Negative input end is connected with one end of the twelfth resistor, the other end of the twelfth resistor, second operation
The output end of amplifier is connected with the positive input terminal of the third operational amplifier, one end of the 9th resistance, described
The positive power source terminal of the first operational amplifier, the positive power source terminal of the second operational amplifier and the third operation amplifier
The positive power source terminal of device connects and its connecting pin is connect with the positive voltage output end of the charge control and energy-storage module, described
The negative power end and the third operational amplifier of the negative power end of first operational amplifier, the second operational amplifier
Negative power end connection and its connecting pin connect with the negative voltage output end of the charge control and energy-storage module, described the
The other end of nine resistance, the second operational amplifier positive input terminal connected with one end of the tenth resistance, it is described
One end of thirteenth resistor connect with the negative input end of the third operational amplifier, the thirteenth resistor it is another
It holds, the output end of the third operational amplifier is connected with one end of the 14th resistance, the 14th resistance
The other end connect with one end of the 7th capacitor and its connecting pin be the signal conditioning module output end, it is described
The other end of the 6th resistance, the other end of the tenth resistance and the 7th capacitor the other end with reference even
It connects.
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