CN207833005U - The detection circuit and electric energy meter of circuit transfer function variation - Google Patents
The detection circuit and electric energy meter of circuit transfer function variation Download PDFInfo
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- CN207833005U CN207833005U CN201820109571.2U CN201820109571U CN207833005U CN 207833005 U CN207833005 U CN 207833005U CN 201820109571 U CN201820109571 U CN 201820109571U CN 207833005 U CN207833005 U CN 207833005U
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- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 238000005070 sampling Methods 0.000 claims description 10
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- 238000012544 monitoring process Methods 0.000 claims description 7
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- 238000005516 engineering process Methods 0.000 description 2
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
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- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a kind of detection circuit and electric energy meter of circuit transfer function variation.The circuit includes：First reference signal source, for sending benchmark test signal to objective circuit so that objective circuit exports mixed signal；Second reference signal source, for sending at least reference signal all the way to synchronizing relevant detection module；Relevant detection module is synchronized, for reference signal and mixed signal to be synchronized relevant detection, obtains detection signal, and the variation according to the amplitude-frequency characteristic of detection signal and phase frequency feature relative to the transmission function of the determining objective circuit of variation of preset calibrations value.The utility model can realize the variation of on-line checking objective circuit transmission function, real-time diagnosis is due to the exceeded situation of meter accuracy caused by electricity stealing or fault, the controllability for improving electrical energy meter electricity energy measuring accuracy reduces stealing, increases metering circuit reliability of operation and safety.
Description
Technical field
The utility model belongs to Electric Energy Metering Technology field, is the inspection for being related to circuit transfer function variation more specifically
Slowdown monitoring circuit and electric energy meter.
Background technology
In power supply system, electricity is a kind of commodity, and electric energy metering device is then a scale, whether it accurate, is directly closed
It is to the economic interests for electricity consumption both sides.Intelligent electric energy meter is in electric energy measurement at present, generally all by power network current, voltage signal
It is converted to by electric energy meter, sensor and sampling network and meets ADC (Analog to Digital Converter, analog-to-digital conversion
Chip) input voltage safe range voltage signal, the transformed digital signals of ADC are input to digital processing element again, into
Row power calculation and metering.
Electric energy meter can be Jing Guo higher precision grade before manufacture standard scale calibrated, meet electric energy meter standard regulation
Class of accuracy.After electric energy meter field installation, it can be caused due to external environment variation, component aging failure etc. are many
Electrical energy meter accuracy changes.Whether the precision of electric energy meter changes at the scene, if class of accuracy requirement is still conformed to, it is existing
The problem of whether field stealing and metering circuit failure can find, be for electricity consumption both sides' critical concern in time.
The administrative staff of electric energy meter are after electric energy meter linked network in whole life cycle management process at present, all use periodically from
The method that line inspects electric energy meter error by random samples, can not real time on-line monitoring find the variation of each piece of linked network electrical energy meter accuracy in time, and
Self diagnosis electricity stealing or ic for energy metering failure, cause the error of electric energy tariffing, unnecessary to being brought for electricity consumption both sides
Trouble and loss.
Utility model content
The purpose of this utility model is to provide the detection circuits and electric energy meter of a kind of variation of circuit transfer function, it is intended to solve
Certainly in the prior art cannot detection circuit transmission function in time variation, and then be unable to the change of real time on-line monitoring electrical energy meter accuracy
The problem of changing, electricity stealing and metering circuit fault point cannot be diagnosed in time.
The utility model embodiment first aspect provides a kind of detection circuit of circuit transfer function variation, for detecting
It is coupled in the transmission function of the objective circuit between the output end of the first signal source, first signal source is to the objective circuit
The first signal is sent, the detection circuit includes：First reference signal source, the second reference signal source and synchronous relevant detection mould
Block；
First reference signal source, connect with the objective circuit, for sending benchmark test to the objective circuit
Signal so that the objective circuit exports the mixed signal of the benchmark test signal and first Signal averaging；
Second reference signal source is connected with the synchronous relevant detection module, for synchronizing relevant detection to described
Module sends at least reference signal all the way；
It is described to synchronize relevant detection module, it connect with the objective circuit, is also connect with second reference signal source, used
In the reference signal and the mixed signal are synchronized relevant detection, detection signal is obtained, and believe according to the detection
Number amplitude-frequency characteristic and phase frequency feature determined relative to the variation of preset calibrations value the objective circuit transmission function variation.
Optionally, described to synchronize relevant detection module and include：Detection unit and judging unit；
The detection unit is connect with the objective circuit, is also connect with second reference signal source, and being used for will be described
Reference signal synchronizes relevant detection with the mixed signal, obtains detection signal；
The judging unit is connect with the detection unit, for the amplitude-frequency characteristic and phase frequency according to the detection signal
Feature determines the variation of the transmission function of the objective circuit relative to the variation of preset calibrations value.
Optionally, the detection unit includes the first multiplier and the first low-pass filter；
The first input end of first multiplier is connect with second reference signal source, and the of first multiplier
Two input terminals are connect with the objective circuit, the input terminal of the output end of first multiplier and first low-pass filter
Connection；
The output end of first low-pass filter is connect with the judging unit.
Optionally, the detection unit further includes the second multiplier and the second low-pass filter；
The first input end of second multiplier is connect with second reference signal source, and the of second multiplier
Two input terminals are connect with the objective circuit, the input terminal of the output end of second multiplier and second low-pass filter
Connection；
The output end of second low-pass filter is connect with the judging unit；
Second multiplier and first multiplier are in parallel.
Optionally, the detection circuit further includes warning device；
The warning device is connect with the judging unit；
The judging unit is additionally operable to amplitude-frequency characteristic and phase frequency feature when the detection signal relative to preset calibrations value
Variation when being more than default variation range, send alarm signal to the warning device.
Optionally, the objective circuit includes sampling network and measuring unit；
The sampling network is the circuit for including at least one of resistance, capacitance and inductance electronic device.
Optionally, the sampling network is arranged in integrated circuit external, the measuring unit, first reference signal
Source, second reference signal source are integrated in the synchronous relevant detection module in the integrated circuit.
Optionally, the detection circuit further includes：
It is connected to the objective circuit and the filter group synchronized between relevant detection module, is used for the mixing
Signal first be filtered, and the mixed signal after first is filtered is output to and described synchronizes relevant detection mould
Block.
Optionally, the detection circuit further includes ic for energy metering；
The filter group is additionally operable to the institute that mixed signal progress second is filtered, and second is filtered
It states mixed signal and is output to ic for energy metering.
The utility model embodiment second aspect provides a kind of electric energy meter, including above-described embodiment first aspect provides
The detection circuit of circuit transfer function variation described in any one.
Existing advantageous effect is the utility model embodiment compared with prior art：First reference signal source is electric to target
Road sends benchmark test signal so that objective circuit exports mixed signal；Second reference signal source is to synchronizing relevant detection module
Send at least reference signal all the way；It synchronizes relevant detection module and reference signal and mixed signal is synchronized into relevant detection, obtain
To detection signal, and according to the amplitude-frequency characteristic and phase frequency feature of detection signal the mesh is determined relative to the variation of preset calibrations value
The variation for marking the transmission function of circuit, realizes the variation of on-line checking objective circuit transmission function, to realize on-line monitoring
Electrical energy meter accuracy changes, and real-time diagnosis is improved due to electricity stealing and due to the exceeded situation of meter accuracy caused by various failures
The controllability of electrical energy meter electricity energy measuring accuracy reduces stealing, increases metering circuit reliability of operation and safety.
Description of the drawings
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this practicality is new
Some embodiments of type for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structure diagram of the detection circuit for the circuit transfer function variation that the utility model embodiment one provides；
Fig. 2 is the circuit diagram of the detection circuit for the circuit transfer function variation that the utility model embodiment two provides；
Fig. 3 is that the fault point of the detection circuit detection for the circuit transfer function variation that the utility model embodiment two provides shows
It is intended to；
Fig. 4 is that another circuit of the detection circuit for the circuit transfer function variation that the utility model embodiment three provides shows
It is intended to；
Fig. 5 is the detection circuit for the circuit transfer function variation based on three-phase current that the utility model embodiment five provides
Circuit diagram.
Specific implementation mode
In order to make technical problem to be solved in the utility model, technical solution and advantageous effect be more clearly understood, with
Lower combination accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein
It applies example to be only used to explain the utility model, is not used to limit the utility model.
Embodiment one
Referring to Fig. 1, a kind of detection circuit of circuit transfer function variation provided in this embodiment is coupled in for detecting
The transmission function of objective circuit between the output end of one signal source, first signal source send first to the objective circuit
Signal, the detection circuit include：First reference signal source 100, the second reference signal source 200 and synchronous relevant detection module
300。
First reference signal source 100 is suitable for connecting with the objective circuit, is surveyed for sending benchmark to the objective circuit
Trial signal so that the objective circuit exports the mixed signal of the benchmark test signal and first Signal averaging.
Second reference signal source 200 is connected with synchronous relevant detection module 300, for synchronizing relevant detection module 300
Send at least reference signal all the way.
It synchronizes relevant detection module 300 to connect with the objective circuit, also connect, be used for the second reference signal source 200
The reference signal and the mixed signal are synchronized into relevant detection, obtain detection signal, and according to the detection signal
Amplitude-frequency characteristic and phase frequency feature determined relative to the variation of preset calibrations value the objective circuit transmission function variation.
Wherein, the amplitude-frequency characteristic is signal corresponding with the amplitude of benchmark test signal point in the detection signal
Amount, the phase frequency are characterized as signal component corresponding with the phase of benchmark test signal in the detection signal.
Specifically, when the detection signal is direct current signal all the way, then the detection signal is the detection signal
The product value of amplitude-frequency characteristic and phase frequency feature；It, then can be according to the two-way when the detection signal is two-way direct current signal
Direct current signal obtains the amplitude-frequency characteristic and phase frequency feature of detection signal.
The signal frequency of first reference signal source 100 and the second reference signal source 200 is equal.
Optionally, the first reference signal source 100 and the second reference signal source 200 can be the same reference signal source,
It can be different reference signal sources.
In the detection circuit of foregoing circuit transmission function variation, the first reference signal source 100 sends benchmark to objective circuit
Test signal so that objective circuit exports mixed signal；Second reference signal source 200 is sent to relevant detection module 300 is synchronized
At least reference signal all the way；It synchronizes relevant detection module 300 and reference signal and mixed signal is synchronized into relevant detection, obtain
Signal is detected, and the target is determined relative to the variation of preset calibrations value according to the amplitude-frequency characteristic and phase frequency feature of detection signal
The variation of the transmission function of circuit realizes the variation of on-line checking objective circuit transmission function, and real-time diagnosis is due to stealing row
For or fault caused by the exceeded situation of meter accuracy, improve electrical energy meter electricity energy measuring accuracy controllability, reduce stealing hair
It is raw, increase metering circuit reliability of operation and safety.
Embodiment two
According to embodiment one, referring to Fig. 2, as a kind of specific implementation mode, the first reference signal source 100 and the second base
Calibration signal source 200 is different reference signal source.The signal frequency of first reference signal source 100 and the second reference signal source 200
It is equal.
Wherein, the benchmark test signal that the first reference signal source 100 is sent out can be periodic sinusoidal wave, the second benchmark letter
The reference signal that number source 200 is sent out can be periodic digital square-wave.
Further, the objective circuit includes：First resistor R0, second resistance R1,3rd resistor R2, the first capacitance
C1, second capacitance C2, ADC and ic for energy metering.Wherein, the ADC is used for first signal and the benchmark test
Signal averaging is the mixed signal, and the mixed signal of simulation is converted to the mixed signal of number.
The first resistor R0 is electrically connected with the first reference signal source 100, the first end of the first resistor R0 also with institute
The first end connection of second resistance R1 is stated, the second end of the first resistor R0 also connects with the first end of the 3rd resistor R2
It connects.Optional, the first resistor R0 is copper-manganese resistance, and the value of the first resistor R0 is 200 μ Ω.
The second end of the second resistance R1 is electrically connected with the anode of the positive input terminal of ADC and the first capacitance C1.
The second end of the 3rd resistor R2 is electrically connected with the cathode of the negative input end of ADC and the second capacitance C2.
The cathode of the first capacitance C1 is connect with the anode of the second capacitance C2, and the cathode of the first capacitance C1 connects
Ground.Optionally, the resistance value of the second resistance R1 and the 3rd resistor R2 are 1K Ω, the first capacitance C1 and described
The capacitance of two capacitance C2 is 33nF.
The output end of the ADC is connected with the input terminal of synchronous relevant detection module 300.
Optionally, the objective circuit may include：Third capacitance C3.The reference voltage of ADC is connect by third capacitance C3
Ground.The third capacitance C3 is for protecting objective circuit.
The ic for energy metering is used to measure the electric energy of first signal source.
Further, as a kind of specific implementation mode, signal source device on the basis of the first reference signal source 100.
Optionally, the reference signal source device can be current signal source or voltage signal source.The reference signal source
When device is voltage signal source, the first reference signal source 100 and first resistor R0 is connected in parallel, and is sent out to the objective circuit
Send voltage signal source；When the reference signal source device is current signal source, the first reference signal source 100 and the first resistor
R0 connects, and current signal source is sent to the objective circuit.
Wherein, the harmonic wave frequency point of the frequency of the benchmark test signal and first signal, subharmonic frequency point and humorous
Wave frequency point is unequal.
Optionally, the first reference signal source 100 and the second reference signal source 200 have frequency hopping characteristic.
When the signal in 200 present band of the first reference signal source 100 or the second reference signal source is dry by outer signals
When disturbing, frequency hopping, i.e. the first reference signal source 100 or the second base occur for the first reference signal source 100 or the second reference signal source 200
The signal frequency in calibration signal source 200 changes, and is interfered to avoid by outer signals.
When the frequency phase of the frequency of the first reference signal source 100 or the second reference signal source 200 and first signal source
Whens equal, frequency hopping also occurs for the first reference signal source 100 or the second reference signal source 200.
Further, referring to Fig. 2, as a kind of specific implementation mode, synchronizing relevant detection module 300 includes：Detection
Unit 301 and judging unit 302.
The first input end of detection unit 301 is connect with the objective circuit, the second input terminal of detection unit 301 with
The output end of second reference signal source 200 connects, and the output end of detection unit 301 is connect with the input terminal of judging unit 302.Inspection
It surveys unit 301 to be used to the reference signal and the mixed signal synchronizing relevant detection, obtains detection signal.Detection is single
The first input end of member 301 is the first input end for synchronizing relevant detection module 300, and the second input terminal of detection unit 301 is
Synchronize the second input terminal of relevant detection module 300.
Judging unit 302 is used for amplitude-frequency characteristic and phase frequency feature according to the detection signal relative to preset calibrations value
Variation determines the variation of the transmission function of the objective circuit.
Optionally, detection unit 301 includes：First multiplier and the first low-pass filter.Wherein, the second reference signal source
200 send reference signal all the way to relevant detection module 300 is synchronized.
The first input end of first multiplier is the first input end of detection unit 301, first multiplier
Second input terminal is the second input terminal of detection unit 301, the output end of first multiplier and first low-pass filtering
The input terminal of device connects, and is used to receive the reference signal all the way, the reference signal will be multiplied all the way with the mixed signal,
Multiplying signal is obtained, and the multiplying signal is sent to first low-pass filter.
The output end of first low-pass filter is connect with judging unit 302, low for carrying out the multiplying signal
Pass filter obtains the detection signal.
The detection signal is the product value of the amplitude-frequency characteristic and the phase frequency feature, according to the amplitude-frequency characteristic and institute
State the variation that changes the transmission function that determines the objective circuit of the product value for preset calibrations value of phase frequency feature.
Illustratively, referring to Fig. 3, for the failure of the detection circuit detection of circuit transfer function provided in this embodiment variation
Point schematic diagram.When a points carry out short circuit with b points in figure, stealing mesh can be reached in this way to being shunted by the electric current of resistance R0
's.But the electric current that the benchmark test signal of reference signal source transmission flows through resistance R0 is also shunted by the line of a points and b point short circuits,
The mixed signal that the first signal and benchmark test signal by shunting are formed, mixed signal, which is input to, synchronizes relevant detection module
Afterwards, relevant detection is synchronized with reference signal, obtains detection signal, according to the amplitude-frequency characteristic of detection signal relative to pre- bidding
Determining amplitude-frequency characteristic can become smaller, to detect the stealing event.
Illustratively, when a point rosin joints or open circuit in figure, or c point rosin joints or open circuit, filter group monitoring it is described
The electricity at objective circuit both ends can become larger, and the mixed signal that benchmark test signal and the first signal are formed, which is input to, synchronizes relevant inspection
After surveying module, relevant detection is synchronized with reference signal, according to the amplitude-frequency characteristic of detection signal relative to preset calibrations amplitude-frequency
Feature can become larger, and so as to check, whether a points or c points exception occur in objective circuit.
Illustratively, when in figure d points occur temperature drift or failure, or e points temperature drift or failure occurs, metering essence can be influenced
Degree, the mixed signal that benchmark test signal and the first signal are formed is input to synchronize relevant detection module after, with reference signal into
Row synchronizes relevant detection, can be changed relative to preset calibrations value according to the amplitude-frequency characteristic of detection signal and phase frequency feature,
To detect whether d points or e dot circuits exception occur.
Illustratively, when in figure f points leak electricity, can cause filter group monitor objective circuit electricity reduce, together
When so that the error of metering electric energy is become larger.The mixed signal that benchmark test signal and the first signal are formed, which is input to, synchronizes relevant detection
After module, relevant detection is synchronized with reference signal, according to the amplitude-frequency characteristic of detection signal and phase frequency feature relative to default
Calibration value can change, to detect whether f dot circuits exception occur.
Illustratively, when g points resistance, h point ADC or i point ADC reference voltages break down in figure, metering essence can be influenced
Degree, the mixed signal that benchmark test signal and the first signal are formed is input to synchronize relevant detection module after, with reference signal into
Row synchronizes relevant detection, can be changed relative to preset calibrations value according to the amplitude-frequency characteristic of detection signal and phase frequency feature,
To detect whether g points, h points or i points exception occur.
Optionally, it further includes warning device to synchronize relevant detection module 300.The warning device connects with judging unit 302
It connects.
Judging unit 302 is big relative to the variation of preset calibrations value in the amplitude-frequency characteristic and phase frequency feature of the detection signal
When default variation range, generates alarm signal and be sent to the warning device.
Illustratively, when the amplitude-frequency characteristic and the product value of the phase frequency feature are big relative to the variation of preset calibrations value
When default variation range, judging unit 302 generates alarm signal and is sent to the warning device, warning device by shining,
The modes such as flicker or sound are alarmed, and administrative staff is prompted to check electric energy meter, check whether objective circuit breaks down, and are checked
Whether electricity stealing is occurred.The present embodiment does not limit type of alarm.
Further, in one embodiment, the objective circuit includes sampling network and measuring unit, the sampling network
It is the circuit for including at least one of resistance, capacitance and inductance electronic device.
The sampling network is arranged in integrated circuit external, the measuring unit, the first reference signal source 100, the second base
Calibration signal source 200 is integrated in synchronous relevant detection module 300 in the integrated circuit.
Integrated circuit has small, and light-weight, lead-out wire and pad are few, long lifespan, and reliability is high, and it is excellent that performance is good etc.
Point, at the same it is at low cost, convenient for large-scale production.Therefore, the measuring unit, the first reference signal source 100, the second benchmark are believed
Number source 200 is integrated in synchronous relevant detection module 300 in the integrated circuit, reduces other circuit devcies to detection circuit
It influences, improves the stability of detection circuit, while saving the cost of detection circuit in the present embodiment, improve the longevity of detection circuit
Life.
Further, referring to Fig. 2, the detection circuit further includes：It is connected to the objective circuit and synchronous relevant detection
Filter group between module 300.The filter group is used to mixed signal progress first being filtered, and by first
The mixed signal after being filtered, which is output to, synchronizes relevant detection module 300.
Optionally, the detection circuit further includes ic for energy metering.
The filter group is additionally operable to the institute that mixed signal progress second is filtered, and second is filtered
It states mixed signal and is output to ic for energy metering.
The mixed signal that ic for energy metering is filtered according to second measures the electric energy of first signal source.
In above-described embodiment, the first reference signal source 100 sends benchmark test signal to objective circuit so that objective circuit
Export mixed signal；Second reference signal source 200 sends at least reference signal all the way to relevant detection module 300 is synchronized；It is synchronous
Reference signal and mixed signal are synchronized relevant detection by relevant detection module 300, obtain detection signal, and believe according to detection
Number amplitude-frequency characteristic and phase frequency feature determined relative to the variation of preset calibrations value the objective circuit transmission function variation,
The variation of on-line checking objective circuit transmission function is realized, real-time diagnosis is due to ammeter caused by electricity stealing or fault
The exceeded situation of precision improves the controllability of electrical energy meter electricity energy measuring accuracy, reduces stealing, and what increase metering circuit was run can
By property and safety.
Embodiment three
Referring to Fig. 4, as a kind of specific implementation mode, the first reference signal source 100 and the second reference signal source 200 are same
One reference signal source.
Wherein, the waveform for the signal that reference signal source is sent out is periodic square wave or periodic sinusoidal wave.
Reference signal source is connect with the objective circuit, is also connected with synchronous relevant detection module 300.
Reference signal source sends benchmark test signal to the objective circuit so that the objective circuit exports the benchmark
The mixed signal of test signal and first Signal averaging；Simultaneously also relevant detection module transmission is synchronized to described at least all the way
Reference signal.
Objective circuit, filter group in Fig. 4 and the structure and advantageous effect and embodiment for synchronizing relevant detection module 300
Objective circuit, filter group in two is identical with advantageous effect with the structure of synchronous relevant detection module 300, does not do here superfluous
It states.
Example IV
According to the detection circuit that the circuit transfer function of embodiment one, embodiment two and embodiment three changes, optionally, together
The be concerned with detection unit 301 of detection module 300 of step may include：First multiplier, the second multiplier, the first low-pass filter and
Second low-pass filter.
Wherein, the second reference signal source 200 sends the orthogonal reference letter of two-way to relevant detection module 300 is synchronized
Number.The orthogonal reference signal of the two-way includes reference signal described in reference signal described in the first via and the second tunnel.
Synchronize relevant detection module 300 be additionally operable to by the mixed signal respectively the reference signal orthogonal with two-way into
Row multiplication, low-pass filtering treatment, obtain two-way orthogonal signal, and obtain the width according to the two-way orthogonal signal
Frequency feature and the phase frequency feature.
Specifically, the second reference signal source 200 to synchronize relevant detection module 300 send the first via described in reference signal and
Reference signal described in second tunnel.Reference signal is orthogonal described in reference signal described in the first via and second tunnel.Synchronous phase
Dry detection module 300 receives mixed signal described in two-way, and mixed signal is respectively that letter is mixed described in the first via described in the two-way
Number and the second tunnel described in mixed signal；Mixed signal described in mixed signal described in the first via and the second tunnel is believed for identical mixing
Number.
The first input end of first multiplier is the first input end of detection unit 301, the second input of the first multiplier
End is the second input terminal of detection unit 301, the input of the output end of first multiplier and first low-pass filter
End connection, for receiving reference signal described in the first via, by reference signal described in the first via and mixed signal phase described in the first via
Multiply, obtains the first component signal, and first component signal is sent to the first low-pass filter.
The first input end of second multiplier is also the first input end of detection unit 301, the of second multiplier
Two input terminals are also the second input terminal of detection unit 301, the output end of second multiplier and second low-pass filtering
The input terminal of device connects, and for receiving reference signal described in the second tunnel, will be mixed described in reference signal described in the second tunnel and the second tunnel
Signal multiplication is closed, obtains second component signal, and the second component signal is sent to the second low-pass filter.
Second multiplier and first multiplier are in parallel.
The output end of first low-pass filter is connect with judging unit 302, for the first component signal to be carried out low pass filtered
Wave.
The output end of second low-pass filter is connect with judging unit 302, for second component signal to be carried out low pass filtered
Wave.
The first component signal by low-pass filtering and the second component signal in orthogonal Jing Guo low-pass filtering.
The detection signal includes first component signal by low-pass filtering and described the by low-pass filtering
Two component signals, and believed according to first component signal Jing Guo low-pass filtering and the second component Jing Guo low-pass filtering
Number obtain the amplitude-frequency characteristic and the phase frequency feature.
According to the amplitude-frequency characteristic and the phase frequency feature objective circuit is determined relative to the variation of preset calibrations value
Transmission function variation, realize the variation of on-line checking objective circuit transmission function, real-time diagnosis due to electricity stealing or
The exceeded situation of meter accuracy caused by fault improves the controllability of electrical energy meter electricity energy measuring accuracy, reduces stealing, increases
Add metering circuit reliability of operation and safety.
Embodiment five
The detection circuit of another circuit transfer function variation provided in this embodiment, the first signal is coupled in for detecting
The transmission function of objective circuit between the output end in source, first signal source send three-phase first to the objective circuit and believe
Number, the detection circuit includes the second reference signal source 200, the first reference signal source 100 and synchronous relevant detection module 300.
First reference signal source 100 is suitable for connecting with the objective circuit, for sending three-phase base to the objective circuit
Quasi- test signal makes the mixed signal of each split-phase of the objective circuit output three-phase mixed signal.
Wherein, three-phase mixed signal is the mixed signal of the first signal of three-phase and three-phase benchmark test Signal averaging, including
The mixed signal of each split-phase.
Second reference signal source 200 is connected with synchronous relevant detection module 300, for synchronizing relevant detection module 300
Send at least three tunnel reference signals.
It synchronizes mixed signal of the relevant detection module 300 for by the reference signal respectively with each split-phase and synchronizes phase
Dry detection, obtains the detection signal of each split-phase, and according to the amplitude-frequency characteristic of the detection signal of each split-phase and phase frequency feature relative to
The variation of the preset calibrations value of each split-phase determines the variation of the transmission function of the objective circuit.
Further, referring to Fig. 5, in one embodiment, the first reference signal source 100 and the second reference signal source 200 are
The same reference signal source.
The objective circuit includes A circuitry phases, B circuitry phases and C circuitry phases.
Optionally, the A circuitry phases may include：Mutual inductor CT1, resistance Ra0, resistance Ra1, resistance Ra2, capacitance Ca1,
Capacitance Ca2 and A phase ADC.Mutual inductor CT1 is used to provide a discharge loop to A circuitry phases, prevents other devices of high-voltage breakdown.
The first end of mutual inductor CT1 is connect with the first end of resistance Ra0, and the of the second end of mutual inductor CT1 and resistance Ra0
Two ends connect；The first end of resistance Ra0 is also electrically connected with reference signal source, the second end ground connection of resistance Ra0.
The first end of resistance Ra1 is connect with the first end of resistance Ra0, the second end of resistance Ra1 and synchronous relevant detection mould
Block 300 is electrically connected, and the second end of resistance Ra1 is also connect with the anode of capacitance Ca1.
The first end of resistance Ra2 is connect with the second end of resistance Ra0, the second end of resistance Ra2 and synchronous relevant detection mould
Block 300 is electrically connected, and the second end of resistance Ra2 is also connect with the cathode of capacitance Ca2.
The cathode of capacitance Ca1 is connect with the anode of capacitance Ca2, the cathode ground connection of capacitance Ca1.
The signal positive input terminal Iap of A phases ADC is connect with the second end of resistance Ra1, the signal negative input end Ian of A phases ADC
It is connect with the second end of resistance Ra2.The A phases ADC is for obtaining the first signal of A phase benchmark test signals and A phases, by A phase bases
Quasi- test signal and the first Signal averaging of A phases are that A mixes signal.
Optionally, A circuitry phases can also include A phase ic for energy metering.A phases ic for energy metering and A phase filter groups
Connection, the electric energy for measuring A circuitry phases.
Optionally, the B circuitry phases include：Mutual inductor CT2, resistance Rb0, resistance Rb1, resistance Rb2, capacitance Cb1, capacitance
Cb2 and B phases ADC.Mutual inductor CT2 is used to provide a discharge loop to B circuitry phases, prevents other devices of high-voltage breakdown.
The first end of mutual inductor CT2 is connect with the first end of resistance Rb0, and the of the second end of mutual inductor CT2 and resistance Rb0
Two ends connect；The first end of resistance Rb0 is electrically connected with reference signal source, the second end ground connection of resistance Rb0.
The first end of resistance Rb1 is connect with the first end of resistance Rb0, the second end of resistance Rb1 and synchronous relevant detection mould
Block 300 is electrically connected, and the second end of resistance Rb1 is also connect with the anode of capacitance Cb1.
The first end of resistance Rb2 is connect with the second end of resistance Rb0, the second end of resistance Rb2 and synchronous relevant detection mould
Block 300 is electrically connected, and the second end of resistance Rb2 is also connect with the cathode of capacitance Cb2.
The cathode of capacitance Cb1 is connect with the anode of capacitance Cb2, the cathode ground connection of capacitance Cb1.
The signal positive input terminal Ibp of B phases ADC is connect with the second end of resistance Rb1, the signal negative input end Ibn of B phases ADC
It is connect with the second end of resistance Rb2.The B phases ADC is for obtaining the first signal of B phase benchmark test signals and B phases, by B phase bases
Quasi- test signal and the first Signal averaging of B phases are that B mixes signal.
Optionally, B circuitry phases can also include B phase ic for energy metering.B phases ic for energy metering and B phase filter groups
Connection, the electric energy for measuring B circuitry phases.
Optionally, the C circuitry phases include：Mutual inductor CT3, resistance Rc0, resistance Rc1, resistance Rc2, capacitance Cc1 and electricity
Hold Cc2.Mutual inductor CT3 is used to provide a discharge loop to C circuitry phases, prevents other devices of high-voltage breakdown.
The first end of mutual inductor CT3 is connect with the first end of resistance Rc0, and the of the second end of mutual inductor CT3 and resistance Rc0
Two ends connect；The first end of resistance Rc0 is electrically connected with reference signal source, the second end ground connection of resistance Rc0.
The first end of resistance Rc1 is connect with the first end of resistance Rc0, the second end of resistance Rc1 and synchronous relevant detection mould
Block 300 is electrically connected, and the second end of resistance Rc1 is also connect with the anode of capacitance Cc1.
The first end of resistance Rc2 is connect with the second end of resistance Rc0, the second end of resistance Rc2 and synchronous relevant detection mould
Block 300 is electrically connected, and the second end of resistance Rc2 is also connect with the cathode of capacitance Cc2.
The cathode of capacitance Cc1 is connect with the anode of capacitance Cc2, the cathode ground connection of capacitance Cc1.
The signal positive input terminal Icp of C phases ADC is connect with the second end of resistance Rc1, the signal negative input end Icn of C phases ADC
It is connect with the second end of resistance Rc2.The C phases ADC is for obtaining the first signal of C phase benchmark test signals and C phases, and by C phases
Benchmark test signal and the first Signal averaging of C phases are that C mixes signal.
Optionally, C circuitry phases can also include C phase ic for energy metering.C phases ic for energy metering and C phase filter groups
Connection, the electric energy for measuring C circuitry phases.
Further, as a specific embodiment, the detection circuit further includes A phase filters group, B phase filter groups
With C phase filter groups.
The A phase filters group is connected between A phases ADC and synchronous relevant detection module 300, the B phase filters group
It is connected between B phases ADC and synchronous relevant detection module 300, the C phase filters group is connected to C phases ADC and synchronous relevant inspection
It surveys between module 300.
Wherein, A phase filters group is filtered for mixing signal to the A, and is sent to and is synchronized relevant inspection
Survey module 300.B phase filter groups are filtered for mixing signal to the B, and are sent to and are synchronized relevant detection mould
Block 300.C phase filter groups are filtered for mixing signal to the C, and are sent to and are synchronized relevant detection module
300。
Optionally, it includes detection unit and judging unit to synchronize relevant detection module 300.
Detection unit is used to, according at least reference signal mixes signal to A and synchronizes relevant detection all the way, obtain A phases
Detect signal；Detection unit is additionally operable to, according at least reference signal mixes signal to B and synchronizes relevant detection all the way, obtain
B phases detect signal；Detection unit is additionally operable to according at least reference signal mixes signal to C and synchronizes relevant detection all the way,
It obtains C phases and detects signal.
Amplitude-frequency characteristic and phase frequency feature of the judging unit for detecting signal according to A phases are relative to A phase preset calibrations values
Variation determines the variation of the transmission function of A circuitry phases；According to B phases detect signal amplitude-frequency characteristic and phase frequency feature relative to B phases
The variation of preset calibrations value determines the variation of the transmission function of B circuitry phases；Amplitude-frequency characteristic and the phase frequency spy of signal are detected according to C phases
Levy the variation for the transmission function that C circuitry phases are determined relative to the variation of C phase preset calibrations values.
Wherein, the circuit structure phase of the circuit structure of detection unit and the detection unit in embodiment two or example IV
Together, it does not do and excessively repeats here.
Optionally, it may include warning device to synchronize relevant detection module 300.
Illustratively, when the amplitude-frequency characteristic that A phases detect signal is more than in advance relative to the variation of A phase preset calibrations amplitude-frequency characteristics
If when amplitude-frequency changing value or A phases detect the phase frequency feature of signal be more than relative to the variation of A phase preset calibrations phase frequency features it is default
When phase frequency changing value, judging unit 302 generates alarm signal and is sent to the warning device, and warning device is by shining, flickering
Or the modes such as sound are alarmed, and administrative staff is prompted to check electric energy meter, check whether objective circuit breaks down, and are checked whether
Electricity stealing occurs.The present embodiment does not limit type of alarm.
Optionally, reference signal source is integrated in integrated circuits with synchronous relevant detection module 300.
Optionally, A phase ADC, the B phase ADC and C phases ADC of the objective circuit can also be integrated in the integrated circuit.
It should be understood that it is the same reference signal that above-described embodiment, which is only to the first reference signal source and the second reference signal source,
The explanation in source, in addition to this, the first reference signal source 100 and the second reference signal source 200 can also be different reference signals
Source, wherein the first reference signal source 100 is identical with the signal frequency of the second reference signal source 200, here to the first reference signal
Source 100 and the circuit structure that the second reference signal source 200 is different reference signal sources do not do and excessively repeat.
In above-described embodiment, reference signal source sends three-phase benchmark test signal to the objective circuit, makes the target
The mixed signal of each split-phase of circuit output three-phase mixed signal, also to synchronize relevant detection module 300 send at least three tunnels
Reference signal；Synchronize relevant detection module 300 reference signal is synchronized with the mixed signal of each split-phase respectively it is relevant
Detection obtains the detection signal of each split-phase, and according to the amplitude-frequency characteristic and phase frequency feature of the detection signal of each split-phase relative to each
The variation of the preset calibrations value of split-phase determines the variation of the transmission function of the objective circuit, realizes on-line checking objective circuit
The variation of transmission function, to realize on-line monitoring electrical energy meter accuracy variation, real-time diagnosis is due to electricity stealing and due to various
The exceeded situation of meter accuracy caused by failure improves the controllability of electrical energy meter electricity energy measuring accuracy, reduces stealing, increases meter
Measure circuit reliability of operation and safety.
Embodiment six
The utility model embodiment provides a kind of electric energy meter, including above-described embodiment one to embodiment five provide it is arbitrary
A kind of detection circuit of the circuit transfer function variation, and the detection circuit with the variation of foregoing circuit transmission function is had
Some advantageous effects.
Wherein, the electric energy meter monitors electricity on-line by the variation of on-line checking objective circuit transmission function to realize
Energy meter accuracy variation, real-time diagnosis improve electricity due to electricity stealing and due to the exceeded situation of meter accuracy caused by various failures
The controllability of energy table electrical energy measurement precision, reduces stealing, increases metering circuit reliability of operation and safety.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (10)
1. a kind of detection circuit of circuit transfer function variation, for detecting the mesh being coupled between the output end of the first signal source
The transmission function of circuit is marked, first signal source sends the first signal to the objective circuit, which is characterized in that the detection
Circuit includes：First reference signal source, the second reference signal source and synchronous relevant detection module；
First reference signal source, connect with the objective circuit, for sending benchmark test signal to the objective circuit,
So that the objective circuit exports the mixed signal of the benchmark test signal and first Signal averaging；
Second reference signal source is connected with the synchronous relevant detection module, for synchronizing relevant detection module to described
Send at least reference signal all the way；
It is described to synchronize relevant detection module, it connect with the objective circuit, is also connect with second reference signal source, being used for will
The reference signal synchronizes relevant detection with the mixed signal, obtains detection signal, and according to the detection signal
Amplitude-frequency characteristic and phase frequency feature determine the variation of the transmission function of the objective circuit relative to the variation of preset calibrations value.
2. the detection circuit of circuit transfer function variation as described in claim 1, which is characterized in that described to synchronize relevant detection
Module includes：Detection unit and judging unit；
The detection unit is connect with the objective circuit, is also connect with second reference signal source, is used for the reference
Signal synchronizes relevant detection with the mixed signal, obtains detection signal；
The judging unit is connect with the detection unit, for the amplitude-frequency characteristic and phase frequency feature according to the detection signal
Variation relative to preset calibrations value determines the variation of the transmission function of the objective circuit.
3. the detection circuit of circuit transfer function as claimed in claim 2 variation, which is characterized in that the detection unit includes
First multiplier and the first low-pass filter；
The first input end of first multiplier is connect with second reference signal source, and the second of first multiplier is defeated
Enter end to connect with the objective circuit, the output end of first multiplier and the input terminal of first low-pass filter connect
It connects；
The output end of first low-pass filter is connect with the judging unit.
4. the detection circuit of circuit transfer function variation as claimed in claim 3, which is characterized in that the detection unit is also wrapped
Include the second multiplier and the second low-pass filter；
The first input end of second multiplier is connect with second reference signal source, and the second of second multiplier is defeated
Enter end to connect with the objective circuit, the output end of second multiplier and the input terminal of second low-pass filter connect
It connects；
The output end of second low-pass filter is connect with the judging unit；
Second multiplier and first multiplier are in parallel.
5. the detection circuit of circuit transfer function variation as claimed in claim 2, which is characterized in that the detection circuit is also wrapped
Include warning device；
The warning device is connect with the judging unit；
The judging unit is additionally operable to the change relative to preset calibrations value when the amplitude-frequency characteristic and phase frequency feature for detecting signal
When changing more than default variation range, alarm signal is sent to the warning device.
6. the detection circuit of circuit transfer function as described in claim 1 variation, which is characterized in that the objective circuit includes
Sampling network and measuring unit；
The sampling network is the circuit for including at least one of resistance, capacitance and inductance electronic device.
7. the detection circuit of circuit transfer function variation as claimed in claim 6, which is characterized in that the sampling network setting
In integrated circuit external, the measuring unit, first reference signal source, second reference signal source and the synchronous phase
Dry detection module is integrated in the integrated circuit.
8. the detection circuit of circuit transfer function variation as described in any one of claim 1 to 7, which is characterized in that the inspection
Slowdown monitoring circuit further includes：
It is connected to the objective circuit and the filter group synchronized between relevant detection module, is used for the mixed signal
First be filtered, and the mixed signal after first is filtered is output to and described synchronizes relevant detection module.
9. the detection circuit of circuit transfer function variation as claimed in claim 8, which is characterized in that the detection circuit is also wrapped
Include ic for energy metering；
The filter group is additionally operable to mixed signal progress second being filtered, and second is filtered described mixed
It closes signal and is output to ic for energy metering.
10. a kind of electric energy meter, which is characterized in that change including circuit transfer function as claimed in any one of claims 1-9 wherein
Detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820109571.2U CN207833005U (en) | 2018-01-22 | 2018-01-22 | The detection circuit and electric energy meter of circuit transfer function variation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820109571.2U CN207833005U (en) | 2018-01-22 | 2018-01-22 | The detection circuit and electric energy meter of circuit transfer function variation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207833005U true CN207833005U (en) | 2018-09-07 |
Family
ID=63394274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820109571.2U Withdrawn - After Issue CN207833005U (en) | 2018-01-22 | 2018-01-22 | The detection circuit and electric energy meter of circuit transfer function variation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207833005U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196218A (en) * | 2018-01-22 | 2018-06-22 | 深圳市锐能微科技有限公司 | Detection circuit, method and the electric energy meter of circuit transfer function variation |
| CN109752593A (en) * | 2019-01-18 | 2019-05-14 | 钜泉光电科技(上海)股份有限公司 | Detection system and electric energy computation chip and its equipment |
-
2018
- 2018-01-22 CN CN201820109571.2U patent/CN207833005U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196218A (en) * | 2018-01-22 | 2018-06-22 | 深圳市锐能微科技有限公司 | Detection circuit, method and the electric energy meter of circuit transfer function variation |
| CN108196218B (en) * | 2018-01-22 | 2024-05-03 | 深圳市锐能微科技有限公司 | Circuit transfer function change detection circuit, method and electric energy meter |
| CN109752593A (en) * | 2019-01-18 | 2019-05-14 | 钜泉光电科技(上海)股份有限公司 | Detection system and electric energy computation chip and its equipment |
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