CN109387686A - A kind of contactless tension measuring circuit - Google Patents
A kind of contactless tension measuring circuit Download PDFInfo
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- CN109387686A CN109387686A CN201811294292.9A CN201811294292A CN109387686A CN 109387686 A CN109387686 A CN 109387686A CN 201811294292 A CN201811294292 A CN 201811294292A CN 109387686 A CN109387686 A CN 109387686A
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Abstract
The present invention provides a kind of contactless tension measuring circuit, the contactless tension measuring circuit includes sequentially connected Differential input circuit, signal processing circuit and data processing circuit.Contactless tension measuring circuit provided by the invention obtains the ac voltage signal of route to be measured by capacity coupled mode, has good adaptability；Circuit is set to generate three kinds of topological structures by two relay switch, and the input voltage for treating survey line road based on this is calculated, number of parts is less convenient to carry out, has good practicability.
Description
Technical field
The present invention relates to voltage measurement fields, and in particular to arrives a kind of contactless tension measuring circuit.
Background technique
Traditional contact ammeter firstly the need of wire insulation is destroyed, cannot destroy insulating layer some during installation
Measurement point can not just obtain voltage value, therefore be badly in need of that a kind of low cost, simple to install, precision is higher, accommodative ability of environment is stronger
Contactless voltage measurement system large-scale voltage monitoring is carried out to power distribution network.
Under the premise of not destroying wire insulation, the thickness of insulating layer of route to be measured is to change with actual conditions, one
The non-contact measurement mode of a little traditional preset parameter formulas can only provide the biggish estimated value of error, cannot accurately survey
Measure the voltage value of route to be measured.
Summary of the invention
In order to solve the problems, such as that existing ammeter exists, the present invention provides a kind of contactless tension measuring circuits, pass through
Capacity coupled mode obtains the ac voltage signal of route to be measured, has good adaptability；Made by two relay switch
Circuit generates three kinds of topological structures, and the input voltage for treating survey line road based on this is calculated, and number of parts is less just
In implementation, there is good practicability.
Correspondingly, the present invention provides a kind of contactless tension measuring circuit, the contactless tension measuring circuit
Including sequentially connected Differential input circuit, signal processing circuit and data processing circuit；
The Differential input circuit includes two detection electrodes, when carrying out contactless voltage measurement, two detection electricity
Pole couples the parasitic capacitance that form two different from route to be measured respectively, for incuding the electricity generated by line input voltage to be measured
Field signal；
The signal processing circuit has the topological circuit structure of a variety of different transfer function characteristics, the electric field signal warp
Multiple and different output voltages is formed after the signal processing circuit；
The data processing circuit includes MCU processing circuit, and the MCU processing circuit is based on the plurality of different output
Voltage and corresponding multiple and different transmission function equations, calculate the input voltage.
When carrying out contactless voltage measurement, described two detection electrodes are relatively fixed, described two detection electrodes it
Between formed fixed capacity Ca。
The signal processing circuit includes the identical sub-circuit of two line structures and difference amplifier, two-way sub-circuit input terminal
It is connect respectively with two detection electrodes, obtains input signal, be then successively grounded after switching capacitance and ground resistance, described
The relay switch for control is parallel on switching capacitance；
Two input terminals of the difference amplifier are respectively connected to the switching capacitance and ground connection electricity of the two-way sub-circuit
Between resistance；
When the relay switch state of the two-way sub-circuit changes, the topological circuit structure of the signal processing circuit changes
Become, the difference amplifier output end forms different output voltages.
The two-way sub-circuit respectively further comprises ground capacity；The ground capacity is in parallel with the ground resistance.
The difference amplifier is instrument amplifier.
The data processing circuit further includes analog to digital conversion circuit, and analog-digital conversion circuit as described input terminal is put with the difference
Big device output end connection, output end are connect with the MCU data processing circuit input terminal.
The contactless tension measuring circuit further includes the Digital Display Circuit for showing line input voltage to be measured, described
Digital Display Circuit is connect with the MCU data processing circuit.
The contactless tension measuring circuit further includes the wireless transmission circuit for uploading line input voltage to be measured,
The wireless transmission circuit is connect with the MCU data processing circuit.
The present invention provides a kind of contactless tension measuring circuits, obtain route to be measured by capacity coupled mode
Ac voltage signal has good adaptability；By two relay switch make circuit generate three kinds of topological structures, and as
The input voltage that survey line road is treated on basis is calculated, and number of parts is less convenient to carry out, has good practicability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 shows the contactless voltage measurement system structure chart of embodiment one；
Fig. 2 shows the topology unit schematic diagrams of the signal processing module of embodiment one；
Fig. 3 shows the signal processing module structure chart of embodiment two；
Fig. 4 shows the signal processing module structure chart of example IV；
Fig. 5 shows the encapsulating structure figure of INA332 instrument amplifier；
Fig. 6 shows the contactless voltage measurement system structure chart of embodiment six；
Fig. 7 shows the data processing module structure chart of embodiment seven；
Fig. 8 shows the contactless voltage measurement system structure chart of embodiment eight；
Fig. 9 shows the circuit diagram of the contactless tension measuring circuit of embodiment nine.
Figure 10 shows the contactless voltage measurement method flow chart of embodiment nine；
Figure 11 shows the contactless voltage measurement method flow chart of embodiment ten.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
Fig. 1 shows the contactless voltage measurement system structure chart of the embodiment of the present invention.The non-of the embodiment of the present invention connects
Touch voltage measurement system includes differential type detecting module, signal processing module and data processing module, and differential type detects mould
Block, signal processing module and data processing module are sequentially connected.
Wherein, the differential type detecting module of the embodiment of the present invention is used to form two unequal first with route to be measured and post
Raw capacitor CP1With the second parasitic capacitance CP2, and it is based on the first parasitic capacitance CP1With the second parasitic capacitance CP2It obtains described to survey line
The input voltage V on roadi(s)。
In general, total energy constitutes a capacitor between any two insulated metal body, especially in the lesser feelings of insulation distance
Under condition, capacitance characteristic is more obvious.In embodiments of the present invention, the plain conductor in line insulation layer to be measured and differential type detect
Parasitic capacitance is formed between module.In general, differential type detecting module includes, for the ease of distinguishing, dividing there are two detection electrode
It is not named as first electrode 201 and second electrode 202.Therefore, first electrode 201 and second electrode 201 respectively with route to be measured
Form two parasitic capacitances, respectively the first parasitic capacitance CP1With the second parasitic capacitance CP2。
Due to the input voltage V of route to be measurediIt (s) is alternating voltage, therefore, by the physical property of capacitor it is found that be measured
The current direction variation of route (the one of electrode for being equivalent to parasitic capacitance) can cause another piece of electrode of parasitic capacitance
Electric current changes, and therefore, differential type detecting module is by the input voltage V of route to be measuredi(s) input system as an electrical current,
It is handled for signal processing module.
Generally speaking, differential type detecting module be used in a manner of capacity coupled, obtain the voltage value of route to be measured and with
The form of two-way difference is input in system, the input as system.
Wherein, the signal processing module of the embodiment of the present invention is used for single according to a variety of topologys for including in signal processing module
Meta structure, the input voltage V for the route to be measured that processing differential type detecting module obtainsi(s) (refer to the input value of route to be measured, it is defeated
Entering form can be the various ways such as voltage, electric current), and export to data processing module and handled.
Fig. 2 shows a kind of topology unit schematic diagrams of signal processing module.Fig. 2 is signal processing of embodiment of the present invention mould
Block one of which topology unit structure, first electrode 201 and second electrode 202 are respectively connected to the cathode input of differential amplification unit
End and electrode input end；In order to guarantee the normal work of differential amplification unit, pass through ground resistance R first for the defeated of route to be measured
Enter voltage Vi(s) cause the curent change of detection electrode to be converted into voltage value, and direct-to-ground capacitance is prevented by earth capacitor C
It is influenced caused by route；The output end output valve v of differential amplification unito(s)。
By topology unit circuit structure shown in Fig. 2, transmission function is constructed
Wherein, s is complex frequency domain operator.
In specific implementation, as C > > Cp1, C > > Cp2When, the transmission function of topology unit circuit shown in Fig. 2 can letter
It turns toWherein, s is complex frequency domain operator.
It can be seen that the transmission function formula that either general transmission function formula still simplifies from transmission function,
There is three unknown algebra, respectively the input value v of circuit under testo(s), the first parasitic capacitance CP1With the second parasitic capacitance
CP2。
In fact, the first parasitic capacitance CP1, the second parasitic capacitance CP2Insulating layer material, insulating layer thickness with route to be measured
Degree, difference detecting module are away from the distance between wired foil line to be measured (when difference detecting module is not close to line insulation to be measured
When layer, difference detecting module is away from the distance between wired foil line to be measured and is not equal to thickness of insulating layer), the face of detection electrode
Product, many factors such as shape of detection electrode are related, just because of the complexity that parasitic capacitance calculates, traditional preset parameter formula
Non-contact measurement apparatus precision is not high.Although the first parasitic capacitance C can be obtained by parameter presetP1, the second parasitic electricity
Hold CP2Probable ranges, but due in actual job, thickness of insulating layer, operation mode difference of measuring system of route to be measured etc.
The influence of various aspects situation, measured value is often larger with parameter preset difference, the first parasitic electricity according to calculated by preset parameter
Hold CP1, the second parasitic capacitance CP2Larger, the input voltage v of the route to be measured finally found out is differed with actual valuei(s) and actual value
Differ larger, low measurement accuracy.
On the one hand, from the transmission function formula of topology unit shown in Fig. 2 it is found that in order to make difference detecting module and
Signal processing module works, the first parasitic capacitance CP1With the second parasitic capacitance CP2Value it is not identical；Make the first parasitic capacitance
CP1With the second parasitic capacitance CP2Value it is not identical, can refer to parasitic capacitance mentioned above composition influence factor, not repeat to be situated between
It continues.
Therefore, the signal processing module of the embodiment of the present invention includes multiple topology units, and each topology unit has not
With about the first parasitic capacitance CP1, the second parasitic capacitance CP2, route to be measured input voltage vi(s) transmission function.It is real
In matter, three input voltage v in relation to route to be measured are at least only neededi(s), the first parasitic capacitance CP1With the second parasitic capacitance CP2's
Topology unit (including topology unit described in Fig. 2) can solve input voltage v according to corresponding transmission functioni(s)、
First parasitic capacitance CP1With the second parasitic capacitance CP2Three unknown numbers.
It should be noted that in addition to the first parasitic capacitance CP1, the second parasitic capacitance CP2, route to be measured input voltage vi
(s) other than, the parameter of each part in constructed topology unit avoids introducing new unknown quantity known to being, and increases
Difficulty in computation, embodiment of the specific signal processing module structure composition mode below are discussed in detail again.
Wherein, the data processing module of the embodiment of the present invention is used for the biography according to topology units multiple in signal processing module
The output valve of delivery function and topology unit constructs related input voltage vi(s), the first parasitic capacitance CP1With the second parasitic capacitance
CP2Equation, and find out input voltage vi(s), the first parasitic capacitance CP1With the second parasitic capacitance CP2。
Specifically, being preset with the transmission function G of multiple topology units in signal processing module in data processing module1=f1
(Cp1,Cp2)、G2=f2(Cp1,Cp2)、G3=f3(Cp1,Cp2) ..., then according to the corresponding output valve v of multiple topology unitsi
(s1)、vi(s2)、vi(s3) ... building equation group
Multiple equations in Simultaneous Equations, find out input voltage vi(s), the first parasitic capacitance CP1With the second parasitic capacitance
CP2。
Contactless voltage measurement system provided in an embodiment of the present invention is formed by difference detecting module with circuit under test
Parasitic capacitance obtain input signal, by topology unit multiple and different in signal processing module to the processing of input signal simultaneously
Generate output signal, the related input voltage of the relationship building of data processing module combination transmission function and corresponding output signal
vi(s), the first parasitic capacitance CP1With the second parasitic capacitance CP2Equation group solved, and finally find out required input voltage
vi(s).The system completes contactless voltage measurement by single line and works, and convenient working has good practicability.
Embodiment two:
Fig. 3 shows the signal processing module structure chart of the embodiment of the present invention, in general, signal processing module includes multiple
Topology unit and a topological switch unit.
Topological switch unit is connect with the differential type detecting module and the multiple topology unit respectively, for switching
State the connection status between multiple topology units and differential type detecting module；
The multiple topology unit is respectively provided with different transmission functions, for handling the input voltage of the route to be measured
Vi(s), corresponding output valve is generated.
The embodiment of the invention provides a kind of embodiment of signal processing module, the signal processing moulds of the embodiment of the present invention
Block includes a topological switch unit and three topology units, and topological switch unit can be selected DPTT double-pole triple throw and switch (two-way three-phase
Control switch), three topology units are respectively G1、G2、G3, DPTT double-pole triple throw switchs controls differential type detecting module and three respectively
Connection between topology unit is only attached with one of topology unit in the differential type detecting module same time.
The derivation mode of topological circuit according to Fig.2, derives G respectively1、G2、G3Transmission function, G1、G2、G3's
Transmission function is as follows:
Wherein,
A=2CaCb+Cb 2+Cb 2C2R2s2+2C2CaCbR2s2
B=2Cb 2CR+4CRCaCb
D=CaCp1+CaCP2+CbCP1+Cp1CP2
viIt (s) is the input voltage of system, i.e., line voltage distribution to be measured；Cp1、CP2Respectively the first parasitic capacitance and second is posted
Raw capacitor；CaThe fixed capacity formed between first electrode and second electrode；Cb1、Cb2For the switching electricity in topological transformation module
Hold, Cb=Cb1=Cb2；R, C is respectively ground resistance and ground capacity；S is complex frequency domain operator.
Need to illustrate when, since two electrodes of difference detecting module are made of metal, meeting between two electrodes
Coupling is generated, the embodiment of the present invention is with fixed capacity CaIt indicates.
In embodiments of the present invention, difference detecting module same time and G1、G2、G3One of topology unit connection,
G1、G2、G3Corresponding output valve v can be generated on corresponding output endo1(s)、vo2(s)、vo3(s).Data processing module receives defeated
Value v outo1(s)、vo2(s)、vo3(s), and G is combined1、G2、G3Transmission function vo1(s)、vo2(s)、vo3(s) building related first
Parasitic capacitance CP1, the second parasitic capacitance CP2With input voltage vi(s) function finally finds out required input voltage vi(s)。
Specifically, in embodiments of the present invention, G1、G2It can be considered in G3On the basis of, increase by zero device, is put using difference
The data processing of big unit makes the transmission function of topology unit change, using different transmission function constructor relationships,
Solve the first parasitic capacitance CP1, the second parasitic capacitance CP2With input voltage vi(s)。
Embodiment three:
On the basis of example 2, in order to simplify modular structure, by the signal processing mode of signal processing module it is found that
In the same time, only one differential amplification unit is working.Therefore, G1、G2、G3It can be with a public differential amplification unit, with section
Cost-saving.
Example IV:
On the basis of embodiment three, in conjunction with G1、G2、G3Structure it is found that G1、G2、G3Structural difference it is less, can be with
Simplified to a certain extent.
Fig. 4 shows the signal processing module structure chart of the embodiment of the present invention.Specifically, first electrode 201 and the second electricity
Pole 202 is respectively through the first switching capacitance Cb1With the second switching capacitance Cb2Be connected to afterwards differential amplification unit reversed input section and
Positive input, the first switching capacitance Cb1With the second switching capacitance Cb2It is upper be parallel with respectively the first relay switch 301 and second after
Electric switch 302；In the reversed input section and positive input of differential amplification unit, it is parallel with ground capacity and ground connection electricity respectively
Resistance, for reducing under different measurement scenes measurement accuracy influence caused by direct-to-ground capacitance variation and being provided directly for difference amplifier
Logical circulation road forms stable dc point.
Need to illustrate when, in embodiments of the present invention, when the first relay switch 301 and the second relay switch 302 simultaneously
It disconnects or the first relay switch 301 closure, the second relay switch 302 disconnect or the first relay switch 301 and second is after establishing by cable
When pass 302 is closed at, corresponding structure is the G in embodiment two1、G2、G3Topology unit.
The effect of first relay switch 301 and the second relay switch 302 and the DPTT double-pole triple throw switch of embodiment two are identical.One
As, the first relay switch 301 and the second relay switch 302 are controlled by data processing module, pre- in data processing module
Equipped with transmission function G1、G2、G3, by control the first relay switch 301 and the second relay switch 302, data processing module can be with
The topology unit situation of signal processing module is distinguished, carries out operation convenient for data processing module.
By sharing zero device, the setting difficulty of signal processing module greatly reduced, manufacturing cost substantially reduces, tool
There is good economic benefit；Meanwhile zero device reduction be conducive to reduce system bulk, easy to carry and operation.
Embodiment five:
Fig. 5 shows the encapsulating structure figure of INA332 instrument amplifier, and in specific implementation, the difference of signal processing module is put
Big unit, which can be selected, selects INA332 instrument amplifier, and instrument amplifier is a kind of precision differential voltage amplifier, has superelevation
The advantages that input impedance, extremely good CMRR, low input offset, low output impedance, can be good at amplification in common-mode voltage
Under signal, tiny signal processing on have unique advantage.The gain of instrument amplifier can be by internal preset, can also be by making
User is arranged by pin inner portions or the external gain resistor by being isolated with input signal is preset.
Output end VOUTIt is represented by VOUT=(VIN+-VIN-) * G, G are instrument amplifier gain, in general, gain setting can
It is configured referring to following table:
Embodiment six:
Embodiment one describes the embodiment of signal processing module to embodiment five, and the embodiment of the present invention introduces data processing
The embodiment of module.
Fig. 6 shows the contactless voltage measurement system structure chart of the embodiment of the present invention, wherein line with the arrow is number
It is believed that number transmission connection, no arrow line is control signal transmission connection.
The data processing module of the embodiment of the present invention includes AD conversion unit and arithmetic element, in general, in order to obtain
The real-time condition of the topology unit connection status of signal processing module is taken, will also include topological switching control in data processing module
Unit.Topological switch unit in signal processing module is controlled by topological switch control unit, and data processing module is so as to root
The topology unit connection status of signal processing module is obtained according to the control situation of topological switch control unit, is convenient for arithmetic element
Extract the transmission function of topology unit.
Embodiment seven:
Fig. 7 shows the data processing module structure chart of the embodiment of the present invention.In embodiment five, due to instrument amplifier
INA332 has DC offset voltage, therefore, Butterworth high pass filter unit and small can be arranged in data processing module
Wave noise reduction unit.Before arithmetic element carries out operation, DC component can be filtered out by Butterworth high pass filter unit；Due to surveying
Environment is measured there are electromagnetic noise, noise will interfere output result, therefore at Butterworth high pass filter unit rear, can
Wavelet de-noising is carried out to signal using wavelet de-noising unit, and arithmetic element progress will be transferred to by signal after wavelet de-noising is handled
Operation.
Embodiment eight:
Fig. 8 shows the contactless voltage measurement system structure chart of the embodiment of the present invention.In order to more intuitively read to
The voltage on survey line road, the embodiment of the present invention increase digital display module, data processing module driving in contactless voltage measurement system
Digital display module shows the input voltage v being finally calculatedi(s)。
Further, increase wireless transport module in contactless voltage measurement system, data processing module is calculated
Input voltage v outi(s) former server is uploaded to be backed up and handled.
Embodiment nine:
Based on contactless voltage measurement system described in embodiment one to eight, the embodiment of the present invention provides a kind of non-
Contact tension measuring circuit obtains the ac voltage signal of route to be measured by capacity coupled mode, has good suitable
Ying Xing；So that circuit is generated three kinds of topological structures by two relay switch, and treats the input voltage on survey line road based on this
It is calculated, it is convenient to carry out, there is good practicability.
Fig. 9 shows the circuit diagram of the contactless tension measuring circuit of the embodiment of the present invention.Specifically, described contactless
Tension measuring circuit includes sequentially connected Differential input circuit, signal processing circuit and data processing circuit；
The Differential input circuit includes two detection electrodes, and for the ease of distinguishing, the embodiment of the present invention is named as
First electrode 201 and second electrode 202, two detection electrodes couple to form two different parasitism electricity respectively from route to be measured
Hold, respectively the first parasitic capacitance CP1With the second parasitic capacitance CP2.The alternating current of route to be measured spatially forms electric field, leads to
Cross the first parasitic capacitance CP1With the second parasitic capacitance CP2It obtains electric field signal and is converted to the current signal of Differential input circuit.
Correspondingly, it is identical by the principle that detection electrode and route to be measured form parasitic capacitance, when the phase of two detection electrodes
When fixed to position, a fixed capacity C also will form between two detection electrodesa.First parasitic capacitance CP1, the second parasitic capacitance
CP2With fixed capacity CaAll it is to be formed by coupling or parasitic method, is not shown in the figure in circuit.
The signal processing circuit includes the identical sub-circuit of two line structures and difference amplifier, two-way sub-circuit input terminal
It is connect respectively with two detection electrodes, obtains input signal, be then successively grounded after switching capacitance and ground resistance, described
The relay switch for control is parallel on switching capacitance；From the front end number of the winning the confidence difference of the ground resistance of the two-way sub-circuit
It is input to two input terminals of the difference amplifier.
The sub-circuit connecting with first electrode 201 is named as the first sub-circuit by the embodiment of the present invention, with second electrode 202
The sub-circuit of connection is named as the second sub-circuit.Correspondingly, the relay switch in the first sub-circuit is named as the first relay switch
301, switching capacitance is named as the first switching capacitance Cb1；Relay switch in second sub-circuit is named as the second relay switch 302,
Switching capacitance is named as the second switching capacitance Cb2。
The implementation principle that sub-circuit is introduced by taking the first sub-circuit as an example, when the first relay switch closure, short circuit first is thrown
Cut capacitor Cb1, the first parasitic capacitance CP1Current signal stable voltage power supply point is formed before ground resistance, by current signal
It is converted to voltage signal and send into the input terminal of difference amplifier；The setting of ground capacity mitigates direct-to-ground capacitance and changes to measurement
It is influenced caused by precision, improves measurement accuracy.
By being closed at the first relay switch 301 and the second relay switch 301 or simultaneously switching off the first relay switch
301 and second relay switch 301 or closure the first relay switch 301 disconnect 302 3 kinds of modes of the second relay switch, make signal
Processing circuit generates three kinds of topological structures, and the reception signal of two input terminals of input difference amplifier changes, so that
Output signal generates change, is calculated with obtaining information for MCU processing circuit processes.
In general, the first relay switch 301 and the second relay switch 302 are controlled by MCU processing circuit.
The difference amplifier of the embodiment of the present invention selects INA332 instrument amplifier, and INA332 instrument amplifier has super
High input impedance, extremely good CMRR, low input offset, low output impedance can effectively amplify those under common-mode voltage
Signal.
In general, the output signal of difference amplifier is analog signal, handled for the ease of MCU data processing circuit,
Difference amplifier rear end is connected by analog to digital conversion circuit, for output signal to be converted to digital signal.
The data processing circuit includes MCU data processor, the MCU data processor and the difference amplifier
Output end connection, obtain the output signal of the difference amplifier.
MCU data processor obtains the digital output signal of analog to digital conversion circuit, and three kinds of binding signal processing circuit
The transmission function of topological circuit structure constructs following equation group and is solved, solves line voltage distribution to be measured.
Wherein,
A=2CaCb+Cb 2+Cb 2C2R2s2+2C2CaCbR2s2
B=2Cb 2CR+4CRCaCb
D=CaCp1+CaCP2+CbCP1+Cp1CP2
viIt (s) is the input voltage of system, i.e., line voltage distribution to be measured；Cp1、CP2Respectively the first parasitic capacitance and second is posted
Raw capacitor；CaThe fixed capacity formed between first electrode and second electrode；Cb1、Cb2For the switching electricity in topological transformation module
Hold, Cb=Cb1=Cb2；R, C is respectively ground resistance and ground capacity；S is complex frequency domain operator.
In general, Digital Display Circuit usually is arranged after MCU processing circuit, the line voltage distribution to be measured being calculated is shown；Into
One step, wireless transmission circuit can also be set after MCU processing circuit, the line voltage distribution to be measured being calculated is uploaded to cloud
Server is calculated.
Embodiment ten:
Correspondingly, passing through difference detecting module the embodiment of the invention also provides a kind of contactless voltage measurement method
The first parasitic capacitance C is formed with route to be measured respectivelyP1With the second parasitic capacitance CP2, completed using the characteristic of parasitic capacitance to be measured
The correction of route, and the transmission function of binding signal processing module different topology unit, find out the first parasitic capacitance CP1With
Two parasitic capacitance CP2Capacitance, and find out the voltage V of final route to be measuredi(s)。
Figure 10 shows the contactless voltage measurement method flow chart of the embodiment of the present invention, provided in an embodiment of the present invention
Contactless voltage measurement method the following steps are included:
S101: when carrying out contactless voltage measurement, two are formed not based on differential type detecting module and route to be measured
The first equal parasitic capacitance CP1With the second parasitic capacitance CP2, and based on described two unequal parasitic capacitances inductions by
The input voltage V of the route to be measuredi(s) electric field signal generated；
Two detection electrodes in differential type detecting module form two unequal first parasitisms with route to be measured respectively
Capacitor CP1With the second parasitic capacitance CP2, the first parasitic capacitance CP1With the second parasitic capacitance CP2Respectively in a manner of capacity coupled, obtain
Take the input voltage V of route to be measuredi(s)。
Specifically, input voltage V of the parasitic capacitance by induction route to be measuredi(s) electric field signal generated, will be to survey line
The input voltage V on roadi(s) current signal being converted on differential type detecting module electrode.
It should be noted that route to be measured is solid conductor, alternating current is connected in conducting wire.
S102: the electric field signal is handled by multiple topology units with different transfer function characteristics, shape
At multiple and different output voltages；
In general, signal processing module includes topological switch unit and multiple topology units, topological switch unit is for controlling
Connection between differential type detecting module processed and multiple topology units, multiple topology units are respectively provided with different transmission functions,
The input voltage V of route to be measuredi(s) different output voltage values output can be generated accordingly after different topology unit processing
To data processing module.
S103: establishing corresponding multiple and different transmission function equations based on the plurality of different output voltage,
Calculate the input voltage Vi(s)。
Data processing module constructs related first and posts according to transmission function output valve corresponding with its of different topology circuit
Raw capacitor CP1, the second parasitic capacitance CP2With the voltage V of the route to be measuredi(s) equation group, solution obtain the first parasitic capacitance
CP1, the second parasitic capacitance CP2With the voltage V of the route to be measuredi(s)。
In general, for ease of calculation, needing to turn based on modulus since the output valve of signal processing module is analog signal
Unit is changed, the output valve is converted into digital signal.
Embodiment 11:
Different topology units has different transmission functions in signal processing module, when the structure of signal processing module is true
After fixed, corresponding transmission function relationship is also accordingly determined, when the electric field signal that differential type metal module obtains (passes through first
Parasitic capacitance CP1With the second parasitic capacitance CP2The signal of acquisition) after topology unit processing different in signal processing module, meeting
Generate different output valves；Using the transmission function and corresponding output valve of signal processing module, three at least need to be only established
Related first parasitic capacitance CP1With the second parasitic capacitance CP2, route to be measured voltage Vi(s) algebraic expression can be found out final
The voltage V of route to be measuredi(s)。
The embodiment of the present invention says contactless voltage measurement method by taking signal processing module shown in Fig. 4 as an example
It is bright.Figure 11 shows the contactless voltage measurement method flow chart of the embodiment of the present invention, the embodiment of the present invention it is contactless
Voltage measurement method includes:
S201: two unequal first parasitic capacitance C are formed based on differential type detecting module and route to be measuredP1With second
Parasitic capacitance CP2, obtain the input voltage V of route to be measuredi(s)；
Parasitic, formation capacitor C is generated between two detection electrodes of differential type detecting modulea。
S202: simultaneously switching off the first relay switch and the second relay switch, and data processing module obtains signal processing module
Output valve and combine corresponding transmission function G1Constructor；
S203: the first relay switch of closure simultaneously disconnects the second relay switch, and data processing module obtains signal processing module
Output valve and combine corresponding transmission function G2Constructor；
S204: being closed at the first relay switch and the second relay switch, and data processing module obtains signal processing module
Output valve and combine corresponding transmission function G3Constructor；
In step S202 ~ 204, signal processing module includes three kinds of topology unit structures altogether.In the embodiment of the present invention
In, when the first relay switch 301 and the second relay switch 302 simultaneously switch off or the first relay switch 301 opens second after establishing by cable
It closes 302 closings or the first relay switch 301 and the second relay switch 302 is closed at, following three equations can be constructed
Wherein,
A=2CaCb+Cb 2+Cb 2C2R2s2+2C2CaCbR2s2
B=2Cb 2CR+4CRCaCb
D=CaCp1+CaCP2+CbCP1+Cp1CP2
viIt (s) is the input voltage of system, i.e., line voltage distribution to be measured；Cp1、CP2Respectively the first parasitic capacitance and second is posted
Raw capacitor；CaThe fixed capacity formed between first electrode and second electrode；Cb1、Cb2For the switching electricity in topological transformation module
Hold, Cb=Cb1=Cb2；R, C is respectively ground resistance and ground capacity；S is complex frequency domain operator.
S205: the input voltage V of route to be measured is calculated based on data processing modulei(s)；
The functional equation group that step S202 ~ 204 is established, simultaneous solution finally find out the input voltage V of route to be measuredi
(s)。
S206: the input voltage V of route to be measured is shown based on digital display modulei(s)；
S207: the input voltage V of route to be measured is uploaded based on wireless transport modulei(s) to Cloud Server.
Step S206 and step S207 is established in the system-based of embodiment eight, and digital display module is shown based on data processing
The input voltage V that module calculatesi(s), wireless transport module is by input voltage Vi(s) it is uploaded to Cloud Server and carries out back-up processing.
The present invention provides a kind of contactless tension measuring circuits, obtain route to be measured by capacity coupled mode
Ac voltage signal has good adaptability；By two relay switch make circuit generate three kinds of topological structures, and as
The input voltage that survey line road is treated on basis is calculated, and number of parts is less convenient to carry out, has good practicability.
It is provided for the embodiments of the invention a kind of contactless tension measuring circuit above to be described in detail, herein
In apply that a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to sides
Assistant solves method and its core concept of the invention；At the same time, for those skilled in the art, think of according to the present invention
Think, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as pair
Limitation of the invention.
Claims (8)
1. a kind of contactless tension measuring circuit, which is characterized in that the contactless tension measuring circuit includes successively connecting
Differential input circuit, signal processing circuit and the data processing circuit connect；
The Differential input circuit includes two detection electrodes, when carrying out contactless voltage measurement, two detection electrodes point
The parasitic capacitance that form two different is not coupled from route to be measured, for incuding the electric field letter generated by line input voltage to be measured
Number；
The signal processing circuit includes a variety of topological structures with different transfer function characteristics, described in the electric field signal warp
Multiple and different output voltages is formed after signal processing circuit with various topological structures；
The data processing circuit includes MCU processing circuit, and the MCU processing circuit is based on the plurality of different output voltage
The line input voltage to be measured is calculated with corresponding multiple and different transmission function equations.
2. contactless tension measuring circuit as described in claim 1, which is characterized in that carrying out contactless voltage measurement
When, described two detection electrodes are relatively fixed, and fixed capacity C is formed between described two detection electrodesa。
3. contactless tension measuring circuit as described in claim 1, which is characterized in that the signal processing circuit includes two
The identical sub-circuit of line structure and difference amplifier, two-way sub-circuit input terminal are connect with two detection electrodes respectively, then according to
It is secondary to be grounded after switching capacitance and ground resistance, the relay switch for control is parallel on the switching capacitance；
Two input terminals of the difference amplifier be respectively connected to the two-way sub-circuit switching capacitance and ground resistance it
Between；
When the relay switch state of the two-way sub-circuit changes, the topological structure of the signal processing circuit changes, described
Difference amplifier output end is correspondingly formed different output voltages.
4. contactless tension measuring circuit as claimed in claim 3, which is characterized in that the two-way sub-circuit also wraps respectively
Include ground capacity；The ground capacity is in parallel with the ground resistance.
5. contactless tension measuring circuit as claimed in claim 3, which is characterized in that the difference amplifier is put for instrument
Big device.
6. contactless tension measuring circuit as claimed in claim 4, which is characterized in that the data processing circuit further includes
Analog to digital conversion circuit, analog-digital conversion circuit as described input terminal are connect with the difference amplifier output end, output end and the MCU
The connection of data processing circuit input terminal.
7. such as contactless tension measuring circuit as claimed in any one of claims 1 to 6, which is characterized in that described contactless
Tension measuring circuit further includes the Digital Display Circuit for showing line input voltage to be measured, the Digital Display Circuit and the MCU number
It is connected according to processing circuit.
8. such as contactless tension measuring circuit as claimed in any one of claims 1 to 6, which is characterized in that described contactless
Tension measuring circuit further includes the wireless transmission circuit for uploading line input voltage to be measured, the wireless transmission circuit and institute
State the connection of MCU data processing circuit.
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| CN110146733A (en) * | 2019-05-10 | 2019-08-20 | 深圳市华星光电半导体显示技术有限公司 | Non-contact voltage measuring device and non-contact voltage measurement method |
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| CN113484597A (en) * | 2021-07-16 | 2021-10-08 | 广西电网有限责任公司电力科学研究院 | Voltage measuring device and method |
| CN114441838A (en) * | 2022-04-07 | 2022-05-06 | 南方电网数字电网研究院有限公司 | Voltage measurement method and device and voltage sensor |
| CN115480095A (en) * | 2022-09-19 | 2022-12-16 | 威胜电气有限公司 | Device and method for detecting after-stop and power restoration of electric energy meter |
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