CN109188335A - Clock of power meter offset detection system and method - Google Patents
Clock of power meter offset detection system and method Download PDFInfo
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- CN109188335A CN109188335A CN201810922809.8A CN201810922809A CN109188335A CN 109188335 A CN109188335 A CN 109188335A CN 201810922809 A CN201810922809 A CN 201810922809A CN 109188335 A CN109188335 A CN 109188335A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention belongs to electric energy meter technical field, a kind of clock of power meter offset detection system and method are provided.The system comprises: GPS module, for sending pulse per second (PPS) PPS reference signal to the control module；Crystal oscillator module, for sending non-oscillating reference signal to the control module；Control module, for within a preset period of time, the PPS reference signal is carried out counting to get the first count value, and carry out counting to get the second count value according to clock output signal of the non-oscillating reference signal to the electric energy meter, the clock jitter of the electric energy meter is determined according to first count value and second count value.The present invention can be realized the clock jitter of quickly detection electric energy meter, and detection accuracy is high, reduce testing cost.
Description
Technical field
The invention belongs to electric energy meter technical fields, are to be related to a kind of clock of power meter offset detection system more specifically
And method.
Background technique
The construction dynamics of smart grid is continued to increase recently as country, the quantity explosive growth of intelligent electric energy meter,
Therefore each manufacturer manufacturing shop faces greatly production and delivery pressure, and is electricity to the detection of the clock signal deviations of electric energy meter
The key link of energy table factory testing.
Currently, each electric energy meter manufacturer mainly passes through frequency meter, state to the separate-blas estimation of the clock output signal of electric energy meter
Requirement of family's power grid to clock of power meter error is to be less than 0.5S daily, and this requires the precision of frequency meter to have in 0.1PPM
(Pulse Per minute, sectors punching) grade, but existing low end frequency meter is unable to satisfy the requirement of signal accuracy, to drop
Low detection accuracy；And longer preheating time is needed when counter detects mostly, so that the detection time of electric energy meter is long,
Reduce detection efficiency.
Summary of the invention
In consideration of it, the present invention provides a kind of clock of power meter offset detection system and method, it is intended to solve in the prior art
The problem that the separate-blas estimation precision of electric energy meter is low and detection time is long.
The first aspect of the embodiment of the present invention provides a kind of clock of power meter offset detection system, comprising: GPS
(Global Positioning System, global positioning system) module, crystal oscillator module and control module；
The GPS module, for sending pulse per second (PPS) PPS (Pulse Per Second, pulse per second (PPS)) to the control module
Reference signal；
The crystal oscillator module, for sending non-oscillating reference signal to the control module；
The control module, within a preset period of time, carrying out counting to get the first counting to the PPS reference signal
Value, and carry out counting to get the second count value according to clock output signal of the non-oscillating reference signal to the electric energy meter,
The clock jitter of the electric energy meter is determined according to first count value and second count value.
Optionally, the control module is specifically used for:
It is calibrated to obtain the first reference signal according to frequency of the PPS reference signal to the non-oscillating reference signal；
Within a preset period of time, the PPS reference signal is carried out counting to get the first count value, and according to described
One reference signal carries out counting to get the second count value to the clock output signal of the electric energy meter；
The clock jitter of the electric energy meter is determined according to first count value and second count value.
Optionally, the control module includes control unit, counting unit and judging unit；
Described control unit is counted in the preset time period for controlling the counting unit；
The counting unit, for carrying out counting to get the first count value to the PPS reference signal, and according to described
Non-oscillating reference signal carries out counting to get the second count value to the clock output signal of the electric energy meter；
The judging unit, for according to first count value and second count value determine the electric energy meter when
Clock deviation.
Optionally, the judging unit is specifically used for:
The clocking error of the electric energy meter is obtained according to first count value and second count value；
Judge whether the clocking error is above standard error range；
If the clocking error is more than the standard error range, it is determined that there are deviations for the clock of the electric energy meter.
Optionally, described that the clocking error of the electric energy meter is obtained according to first count value and second count value
It specifically includes:
Wherein, E is the clocking error, and M is first count value, and N is second count value.
Optionally, the control module is also used to:
Obtain the pre-set count values counted to get in the preset time period to the PPS reference signal；
Judge whether the difference of the pre-set count values and standard count value is allowing in difference range；
If the difference of the pre-set count values and standard count value is in the permission difference range, it is determined that described default
Count value is first count value.
The second aspect of the embodiment of the present invention provides a kind of clock of power meter deviation detecting method, is suitable for including GPS
The clock of power meter offset detection system of module, crystal oscillator module and control module, which comprises
The GPS module sends pulse per second (PPS) PPS reference signal to the control module；
The crystal oscillator module sends non-oscillating reference signal to the control module；
Within a preset period of time, the control module carries out counting to get the first count value to the PPS reference signal, with
And it carries out counting to get the second count value according to clock output signal of the non-oscillating reference signal to the electric energy meter；
The control module determines that the clock of the electric energy meter is inclined according to first count value and second count value
Difference.
Optionally, described that the clock output signal of the electric energy meter is counted to get according to the non-oscillating reference signal
Second count value specifically includes:
It is calibrated to obtain the first reference signal according to frequency of the PPS reference signal to the non-oscillating reference signal；
Within a preset period of time, the clock output signal of the electric energy meter is counted according to first reference signal
Obtain second count value.
Optionally, the clock jitter that the electric energy meter is determined according to first count value and second count value
It specifically includes:
The clocking error of the electric energy meter is obtained according to first count value and second count value；
Judge whether the clocking error is above standard error range；
If the clocking error is more than the standard error range, it is determined that there are deviations for the clock of the electric energy meter.
Optionally, the method also includes:
The control module obtain the PPS reference signal is counted to get in the preset time period it is pre-designed
Numerical value；
Judge whether the difference of the pre-set count values and standard count value is allowing in difference range；
If the difference of the pre-set count values and standard count value is in the permission difference range, it is determined that described default
Count value is first count value.
The beneficial effect of clock of power meter offset detection system and method compared with prior art exists in the embodiment of the present invention
In: by the PPS reference signal of GPS module, high-precision checking signal is provided for the detection of electric energy meter, so that detection accuracy
It is high；Crystal oscillator module does not need to preheat in advance, can directly provide non-oscillating reference signal, save detection clock of power meter deviation when
Between, and reduce costs low；Last control module is believed according to the first count value of PPS reference signal and the clock output of electric energy meter
Number the second count value determine the clock jitter of the electric energy meter, realize the clock jitter of quickly detection electric energy meter, improve detection
Efficiency.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structural schematic diagram for the clock of power meter offset detection system that the embodiment of the present invention one provides；
Fig. 2 is the implementation process schematic diagram of clock of power meter deviation detecting method provided by Embodiment 2 of the present invention；
Fig. 3 is the specific implementation flow schematic diagram of step 203 in Fig. 2 provided by Embodiment 2 of the present invention；
Fig. 4 is the specific implementation flow schematic diagram of step 204 in Fig. 2 provided by Embodiment 2 of the present invention；
Fig. 5 is the implementation process signal of another clock of power meter deviation detecting method provided by Embodiment 2 of the present invention
Figure.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Embodiment one
Referring to Fig. 1, a kind of clock of power meter offset detection system provided in an embodiment of the present invention, including GPS module 100,
Crystal oscillator module 200 and control module 300.
Wherein, GPS module 100 is connect with control module 300, and crystal oscillator module 200 is connect with control module 300, controls mould
Block 300 is connect by jockey with electric energy meter.
GPS module 100 is used to send pulse per second (PPS) PPS reference signal to control module 300.
Crystal oscillator module 200 is used to send non-oscillating reference signal to control module 300.
Control module 300 to the PPS reference signal within a preset period of time, carrying out counting to get the first counting
Value, and carry out counting to get the second count value according to clock output signal of the non-oscillating reference signal to the electric energy meter,
The clock jitter of the electric energy meter is determined according to first count value and second count value.
Optionally, PPS reference signal can be 1PPS signal.Wherein, 1PPS=1Hz=1 times/second, i.e. 1PPS signal one
It is second primary, then illustrate that the period of 1PPS signal is one second primary, but the present embodiment to the width of 1PPS signal without limitation,
The width of 1PPS signal can be Millisecond or nanosecond pulse width.
In concrete application, after control module 300 is connect by jockey with electric energy meter, starting GPS is inputted according to user
Module 100, crystal oscillator module 200 and control module 300.GPS module 100 sends pulse per second (PPS) PPS with reference to letter to control module 300
Number, crystal oscillator module 200 sends non-oscillating reference signal to control module 300, while electric energy meter is defeated to 300 tranmitting data register of control module
Signal out.Then control module 300 carries out counting to get the first count value to the PPS reference signal within a preset period of time,
Control module 300 within a preset period of time counts the clock output signal of the electric energy meter according to the non-oscillating reference signal
Number obtains the second count value；Last control module 300 determines the electricity according to first count value and second count value
The clock jitter of energy table.
Wherein, counting of the control module 300 to PPS reference signal and the counting of the clock output signal to electric energy meter can be with
Be it is asynchronous, only need to period that PPS reference signal is counted with the clock output signal of electric energy meter is counted
Period is the preset time period, and the clock jitter of detection electric energy meter is not just limited by signal synchronization in this way, when detection
Between faster.
GPS module 100 is to be integrated with radio frequency chip, baseband chip and CPU (Central Processing Unit, center
Processor), and add associated peripheral circuits and an integrated circuit forming, for satellite positioning and calibration aspect.GPS module
The 100 PPS reference signals issued, can easily do the pulse width of 20nS rank, that is, 0.02PPM, be much higher than electric energy
0.1PPM needed for table clock detection, can be used as standard signal source；And GPS module 100 has in the case where signal is good
There are good long-term frequency stability, almost without cumulative errors, and high-precision PPS reference signal can be provided, improves detection
The precision of clock of power meter deviation.
Crystal oscillator module in the present embodiment is common active oscillator, does not need constant temperature processing.Common active oscillating
Device starting speed is faster than constant-temperature crystal oscillator, has good short-term frequency stability, and then accelerate the deviation of detection electric energy meter
Speed improves detection efficiency.
Above-mentioned clock of power meter offset detection system is the detection of electric energy meter by the PPS reference signal of GPS module 100
High-precision checking signal is provided, so that detection accuracy is high；Crystal oscillator module 200 does not need to preheat in advance, can directly provide oscillation
Reference signal, saves the time of detection clock of power meter deviation, and reduces costs low；Last control module 300 is according to PPS
Second count value of the clock output signal of the first count value and electric energy meter of reference signal determines that the clock of the electric energy meter is inclined
Difference realizes the clock jitter of quickly detection electric energy meter, improves detection efficiency.
In another embodiment, GPS module 100 can be specific GPS chip, such as SYN100MHzGPS locking phase plate,
Best performance, high sensitivity shorten the starting time, quickly enter application state.SYN100MHzGPS locking phase plate passes through first
Serial line interface is connect with control module 300.
The specific chip structure of GPS module 100 without limitation, can also may be implemented to control mould in the present embodiment for other
The GPS chip, such as GPS time service card etc. of the transmission PPS reference signal of block 100.
In another embodiment, control module 300 is MCU.
MCU is also known as one chip microcomputer (Single Chip Microcomputer) or single-chip microcontroller, is centre
The frequency and specification for managing device (Central Process Unit, CPU) do appropriate reduction, and by memory (memory), counter
(Timer), USB (Universal Serial Bus, universal serial bus), A/D (Analog/Digital, analog/digital)
Conversion, UART (universal asynchronous receiving-transmitting transmitter (Universal Asynchronous Receiver/Transmitter), can
Perimeter interfaces or even the LCD such as programmed logic controller, DMA (Direct Memory Access, direct memory access)
(Liquid Crystal Display, liquid crystal display) driving circuit is integrated on a single chip, and the calculating of chip-scale is formed
Machine does various combination control for different applications.
Optionally, control module 300 can be STM32F family chip.The STM32F family chip have high-performance,
The characteristics of low cost, low-power consumption, reduces cost for clock of power meter detection device, improves the property of clock of power meter detection device
Energy.
In another embodiment, control module 300 is specifically used for:
It is calibrated to obtain the first reference signal according to frequency of the PPS reference signal to the non-oscillating reference signal.
In practical application, the non-oscillating reference signal that crystal oscillator module 200 is sent to control module 300 can not be directly to electric energy
The clock output signal of table is counted, but after needing to carry out certain calibration, after meeting calibration frequency, after recycling calibration
Reference signal the clock output signal of electric energy meter is counted.For example, the non-oscillating reference signal that crystal oscillator module 200 is sent
Frequency may be too small, and the precision counted to the clock output signal of electric energy meter is inadequate, and control module 300 is when being counted
It is likely to few note.
So the PPS reference signal that sends first with GPS module 100 of the present embodiment to the non-oscillating reference signal into
Row calibration, control module 300 are calibrated the frequency of the non-oscillating reference signal to obtain the first reference signal, increase oscillation ginseng
Examine what the frequency of signal, the precision of raising non-oscillating reference signal, and then increase counted the clock output signal of electric energy meter
Accuracy.
Within a preset period of time, the PPS reference signal is carried out counting to get the first count value, and according to described
One reference signal carries out counting to get the second count value to the clock output signal of the electric energy meter.
Illustratively, PPS reference signal is 1PPS signal, and the preset time period is 10 minutes, 300 pairs of institutes of control module
It states 1PPS signal to carry out counting to get the first count value in 10 minutes, the 1PPS signal sends crystal oscillator module 200 at this time
The non-oscillating reference signal calibrated to obtain the first reference signal, then control module 300 further according to it is described first reference
Signal carries out counting to get the second count value in 10 minutes to the clock output signal of the electric energy meter.
Illustratively, PPS reference signal is 1PPS signal, and the preset time period is 5 minutes, 300 pairs of institutes of control module
It states 1PPS signal to carry out counting to get the first count value in 5 minutes, then control module 300 is further according to the 1PPS signal to crystalline substance
The non-oscillating reference signal that vibration module 200 is sent is calibrated, and obtains the first reference signal, last control module 300 root again
The clock output signal of the electric energy meter is carried out counting to get the second count value in ten minutes according to first reference signal.
Illustratively, PPS reference signal is 1PPS signal, and the preset time period is 3 minutes, and control module 300 is first led to
It crosses the non-oscillating reference signal that the 1PPS signal of GPS module 100 sends crystal oscillator module 200 to calibrate, obtains first with reference to letter
Number, then control module 300 can carry out counting to get the first count value, Yi Jigen in 3 minutes to the 1PPS signal simultaneously
The clock output signal of the electric energy meter is carried out counting to get the second count value in 3 minutes according to first reference signal.
Optionally, control module 300 is also used to store first count value and second count value.
Illustratively, when control module 300 counts to get the first count value to PPS reference signal progress preset time period
Afterwards, first count value is stored, over time, after electric energy meter can be with tranmitting data register output signal, controls mould
Block 300 is calibrated by the non-oscillating reference signal that PPS reference signal sends crystal oscillator module 200, obtains the first reference signal,
Then the is counted to get to what the clock output signal of the electric energy meter carried out preset time period according to first reference signal
Two count values store second count value.
Store first count value and second count value, may be implemented to PPS reference signal and electric energy meter when
The asynchronous counting of clock output signal.For example, being carried out according to clock output signal of first reference signal to the electric energy meter
After counting, stored first count value can be obtained again, then true by first count value and second count value
The clock jitter of the fixed electric energy meter.
The clock jitter of the electric energy meter is determined according to first count value and second count value.
Illustratively, the size of first count value and second count value is big in first count value
When second count value, determining the electric energy meter, there are clock jitters, are equal in first count value described
When the second count value, then clock jitter is not present in the electric energy meter.For example, in 5 minutes, first count value is 300 times,
Second count value is 290 times, and the first count value is greater than the second count value, determines that there are clock jitters for the electric energy meter；Example
Such as, in 3 minutes, first count value is 180 times, and second count value is 200 times, and the first count value is less than the second meter
Numerical value determines that there are clock jitters for the electric energy meter；For example, in 10 minutes, first count value is 600 times, described the
Two count values are 600 times, and the first count value is equal to the second count value, then clock jitter is not present in the electric energy meter.
Illustratively, the difference for calculating first count value and second count value, judge the difference whether
Allow in difference range, if the difference is allowing in difference range, clock jitter is not present in the electric energy meter, if the difference
Value is not allowing to determine that there are clock jitters for the electric energy meter in difference range.For example, in 5 minutes, first count value
It is 300 times, second count value is 290 times, and the difference of the first count value and the second count value is 10, the permission difference model
It encloses for (- 5,5), it is determined that there are clock jitters for the electric energy meter；For example, first count value is 181 times in 3 minutes,
Second count value is 185 times, and the difference of the first count value and the second count value is -4, the permissions difference range for (- 5,
5), it is determined that clock jitter is not present in the electric energy meter.
In another embodiment, control module 300 includes control unit 310, counting unit 320 and judging unit 330.
Control unit 310 is counted in the preset time period for controlling counting unit 320.
Counting unit 320 is used to carry out counting to get the first count value to the PPS reference signal, and according to the vibration
It swings reference signal the clock output signal of the electric energy meter is carried out counting to get the second count value.
Judging unit 330 is used to determine the clock of the electric energy meter according to first count value and second count value
Deviation.
Wherein, counting unit 320 includes at least two signal input parts, receives the PPS reference signal and described respectively
The clock output signal of electric energy meter.The non-oscillating reference signal of 310 receiving crystal module 200 of control unit, and the oscillation is joined
It examines signal and is sent to counting unit 320.
Optionally, control module 300 goes back the driving signal of the transmission of receiving crystal module 200, and control module 300 is according to described
Driving signal controls control unit 310, counting unit 320 and judging unit 330 and works, i.e., crystal module 200 is also as control
The source driving signal of module 300.
In another embodiment, counting unit 320 is specifically used for:
It is calibrated to obtain the first reference signal according to frequency of the PPS reference signal to the non-oscillating reference signal.
Within a preset period of time, the PPS reference signal is carried out counting to get the first count value, and according to described
One reference signal carries out counting to get the second count value to the clock output signal of the electric energy meter.
The other is judging unit 330 is specifically used in example:
The clocking error of the electric energy meter is obtained according to first count value and second count value.
In practical application, the first count value that the PPS reference signal is counted to get with to the electric energy meter
The second count value majority that clock output signal is counted to get is to be not completely equivalent, if only relatively first counting merely
The size of value and the second count value, the clock jitter of electric energy meter is concluded according to comparison result, may be such that large batch of electric energy
Table is unqualified, increase false detection rate.Moreover, electric energy meter in practical application all can there is a certain error, as long as allowing to miss
In poor range, electric energy meter is qualified.So erroneous detection can be reduced using the allowable error range of electric energy meter as Rule of judgment
Rate.
Illustratively, first count value and second count value are subtracted each other, obtains difference, by the exhausted of the difference
The clocking error is used as to value.For example, in 5 minutes, first count value is 300 times, second count value is 290
Secondary, the difference of the first count value and the second count value is 10, and the absolute value of the difference is 10, then 10 misses as the clock
Difference；For example, in 3 minutes, first count value is 181 times, and second count value is 185 times, the first count value and the
The difference of two count values is -4, and the absolute value of the difference is 4, then 4 is used as the clocking error.
Illustratively, the clocking error rate of electric energy meter is calculated according to the first count value and second count value, it will be described
Clocking error rate is as the clocking error；I.e.Wherein, M is first meter
Numerical value, N are second count value.For example, first count value is 180 times in 3 minutes, second count value is
It is 200 times, described I.e. 10% is used as the clocking error；Example
Such as, in 10 minutes, first count value is 610 times, and second count value is 600 times, described I.e. 1.33% is used as the clocking error.
Judge whether the clocking error is above standard error range.
Illustratively, first count value and second count value are subtracted each other, obtains difference, by the exhausted of the difference
The clocking error is used as to value, then standard error may range from < 8.
Illustratively, the clocking error rate of electric energy meter is calculated according to the first count value and second count value, it will be described
Clocking error rate is as the clocking error, then standard error may range from < 5%.
If the clocking error is more than the standard error range, it is determined that there are deviations for the clock of the electric energy meter.
Illustratively, first count value and second count value are subtracted each other, obtains difference, by the exhausted of the difference
The clocking error is used as to value, then standard error may range from < 8, if the clocking error is more than the standard error model
It encloses, it is determined that there are deviations for the clock of the electric energy meter.For example, in 5 minutes, first count value is 300 times, described the
Two count values are 290 times, and the absolute value of the difference of the first count value and the second count value is 10, then 10 miss as the clock
Difference, standard error range are < 8, it is known that, clocking error is above standard error range, it is determined that the clock of the electric energy meter exists
Deviation；For example, in 3 minutes, first count value is 181 times, and second count value is 185 times, the first count value with
The absolute value of second count value difference is 4, it is known that, clocking error is not above standard error range, it is determined that the electric energy meter
Clock be not present deviation.
Illustratively, the clocking error rate of electric energy meter is calculated according to the first count value and second count value, it will be described
Clocking error rate is as the clocking error, then standard error may range from < 5%, if the clocking error is more than the mark
Quasi- error range, it is determined that there are deviations for the clock of the electric energy meter.For example, first count value is 180 in 3 minutes
Secondary, second count value is 200 times, described Due to standard error
Poor range < 5%, it is known that, clocking error is above standard error range, it is determined that there are deviations for the clock of the electric energy meter；For example,
In 10 minutes, first count value is 610 times, and second count value is 600 times, and the clocking error is 1.33%,
Know that clocking error is not above standard error range, it is determined that deviation is not present in the clock of the electric energy meter.
The other is in example, it is described that the electric energy meter is obtained according to first count value and second count value
Clocking error specifically includes:
Wherein, E is the clocking error, and M is first count value, and N is second count value.
Illustratively, in 3 minutes, first count value is 180 times, and second count value is 200 times, when described
Clock errorFor example, first count value is 610 times, second count value in 10 minutes
It is 600 times, the clocking error
Illustratively, standard error range is set as < 0.05.For example, first count value is 180 times in 3 minutes,
Second count value is 200 times, and the clocking error E is 0.1, since standard error range is set as < 0.05, it is known that clock misses
Difference is more than the standard error range, it is determined that there are deviations for the clock of the electric energy meter；For example, in 10 minutes, described
One count value is 610 times, and second count value is 600 times, and the clocking error is 0.013, it is known that clocking error does not surpass
Cross the standard error range, it is determined that deviation is not present in the clock of the electric energy meter.
The clocking error of electric energy meter is determined above by the first count value and the second count value, can pass through the first count value
Absolute value with the second count value difference can also be calculated as the clocking error according to the first count value and the second count value
Error rate is obtained as the clocking error, it can also be according to formulaThe clocking error is obtained, than passing through
Simple relatively the first count value and the second count value size judge that clock of power meter is more accurate with the presence or absence of deviation, reduce inspection
The error rate of electric energy meter is surveyed, the detection accuracy of clock of power meter deviation is improved.
The other is control module 300 is also used in example:
Obtain the pre-set count values counted to get in the preset time period to the PPS reference signal.
In practical application, the PPS reference signal that GPS module 100 issues may be because of unstable in short-term, so that control mould
Block 300 is abnormal to the counting of PPS reference signal, and the first obtained count value is excessive or too small, does not meet reality.In order to improve
The control module 300 of the detection accuracy and accuracy rate of clock of power meter deviation, the present embodiment is first obtained to by PPS reference signal
Counting carry out reasonability screening, exclude because of GPS error count caused by unstability in short-term, i.e., when first obtaining described default
Between the pre-set count values that the PPS reference signal are counted to get in section, judge to the pre-set count values.
Judge whether the difference of the pre-set count values and standard count value is allowing in difference range.
If the difference of the pre-set count values and standard count value is in the permission difference range, it is determined that described default
Count value is first count value.
Illustratively, PPS reference signal can be 1PPS signal, and the preset time period can be 3 minutes, allow difference
It may range from (- 8,8).3 minutes pre-set count values counted to get are carried out to 1PPS signal specifically, obtaining, such as default
Count value is 175, and standard count value is 180, and the difference of pre-set count values and standard count value is -5, it is known that -5 are allowing difference
In range, i.e., the current pre-set count values are first count value.
Illustratively, PPS reference signal is 1PPS signal, and the preset time period can be 2 minutes, allows difference range
Can be (- 5,5).2 minutes pre-set count values counted to get, such as default counting are carried out to 1PPS signal specifically, obtaining
Value is 128, and standard count value is 120, and the difference of pre-set count values and standard count value is 8, it is known that 8 are not allowing difference model
In enclosing, i.e., the current pre-set count values are ineligible, exclude.
If the difference of the pre-set count values and standard count value is not in the permission difference range, control module
300 continue to obtain the second pre-set count values for counting to get the PPS reference signal in the preset time period.
Judge whether the difference of second pre-set count values and standard count value is allowing in difference range.
If the difference of second pre-set count values and standard count value is in the permission difference range, it is determined that described
Second pre-set count values are first count value.That is, if the default counting counted to get to the PPS reference signal
Value is unqualified always, then control module 300 can obtain always the pre-set count values in preset time period, and be judged, it is known that
The difference of pre-set count values and standard count value is allowing to improve the precision and standard of detection clock of power meter deviation in difference range
Exactness.
In above-described embodiment, by the PPS reference signal of GPS module 100, high-precision school is provided for the detection of electric energy meter
Signal is tested, so that detection accuracy is high；Crystal oscillator module 200 does not need to preheat in advance, can directly provide non-oscillating reference signal, save
The time of clock of power meter deviation is detected, and is reduced costs low；Last control module 300 is according to the first of PPS reference signal
Second count value of the clock output signal of count value and electric energy meter determines the clock jitter of the electric energy meter, realizes quickly detection
The clock jitter of electric energy meter improves detection efficiency.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Embodiment two
Corresponding to the clock of power meter offset detection system in embodiment one, a kind of clock of power meter is present embodiments provided
Deviation detecting method.Referring to fig. 2, the implementation process schematic diagram of clock of power meter deviation detecting method is provided, details are as follows:
S201, GPS module send pulse per second (PPS) PPS reference signal to the control module.
S202, crystal oscillator module send non-oscillating reference signal to the control module.
S203, within a preset period of time, the control module carry out counting to get the first counting to the PPS reference signal
Value, and carry out counting to get the second count value according to clock output signal of the non-oscillating reference signal to the electric energy meter.
Wherein, counting of the control module to PPS reference signal and the counting of the clock output signal to electric energy meter can be
It is asynchronous, only need to the period that PPS reference signal is counted with to the clock output signal of electric energy meter counted when
Between section be the preset time period, in this way detection electric energy meter clock jitter just not by signal synchronization is limited, detection time
Faster.
In another embodiment, referring to Fig. 3, according to the non-oscillating reference signal to the electric energy described in step S203
The specific implementation process that the clock output signal of table count to get the second count value includes:
S301 is calibrated to obtain the first reference according to frequency of the PPS reference signal to the non-oscillating reference signal
Signal.
In practical application, non-oscillating reference signal that crystal oscillator module is sent to control module can not directly to electric energy meter when
Clock output signal is counted, but the reference after needing to carry out certain calibration, after meeting calibration frequency, after recycling calibration
Signal counts the clock output signal of electric energy meter.For example, the frequency for the non-oscillating reference signal that crystal oscillator module is sent may
Too small, the precision counted to the clock output signal of electric energy meter is inadequate, and control module is likely to few note when being counted.
So the present embodiment calibrates the non-oscillating reference signal first with the PPS reference signal that GPS module is sent, control
Module is calibrated the frequency of the non-oscillating reference signal to obtain the first reference signal.
S302, within a preset period of time, according to first reference signal to the clock output signal of the electric energy meter into
Row counts to get second count value.
The non-oscillating reference signal is calibrated first with the PPS reference signal that GPS module is sent, can be increased
The frequency of non-oscillating reference signal improves the precision of non-oscillating reference signal, and then increases and carry out to the clock output signal of electric energy meter
The accuracy of counting.
Optionally, control module is also used to store first count value and second count value.
Illustratively, when control module to PPS reference signal carry out after counting to get the first count value of preset time period,
First count value is stored, over time, after electric energy meter can be with tranmitting data register output signal, control module is logical
It crosses PPS reference signal to calibrate the non-oscillating reference signal that crystal oscillator module is sent, the first reference signal is obtained, then according to institute
Second count value that counts to get that the first reference signal carries out preset time period to the clock output signal of the electric energy meter is stated, it is right
Second count value is stored.
Store first count value and second count value, may be implemented to PPS reference signal and electric energy meter when
The asynchronous counting of clock output signal.For example, being carried out according to clock output signal of first reference signal to the electric energy meter
After counting, stored first count value can be obtained again, then true by first count value and second count value
The clock jitter of the fixed electric energy meter.
S204, the control module according to first count value and second count value determine the electric energy meter when
Clock deviation.
Referring to fig. 4, in another embodiment, according to first count value and second meter described in step S204
Numerical value determines that the specific implementation process of the clock jitter of the electric energy meter includes:
S401 obtains the clocking error of the electric energy meter according to first count value and second count value.
In practical application, the first count value that the PPS reference signal is counted to get with to the electric energy meter
The second count value majority that clock output signal is counted to get is to be not completely equivalent, if only relatively first counting merely
The size of value and the second count value, the clock jitter of electric energy meter is concluded according to comparison result, may be such that large batch of electric energy
Table is unqualified, increase false detection rate.Moreover, electric energy meter in practical application all can there is a certain error, as long as allowing to miss
In poor range, electric energy meter is qualified.So erroneous detection can be reduced using the allowable error range of electric energy meter as Rule of judgment
Rate.
Illustratively, first count value and second count value are subtracted each other, obtains difference, by the exhausted of the difference
The clocking error is used as to value.
Illustratively, the clocking error rate of electric energy meter is calculated according to the first count value and second count value, it will be described
Clocking error rate is as the clocking error；I.e.Wherein, M is first meter
Numerical value, N are second count value.
S402 judges whether the clocking error is above standard error range.
S403, if the clocking error is more than the standard error range, it is determined that the clock of the electric energy meter exists inclined
Difference.
It is described that the electric energy meter is obtained according to first count value and second count value in another embodiment
Clocking error specifically includes:
Wherein, E is the clocking error, and M is first count value, and N is second count value.
The clocking error of electric energy meter is determined above by the first count value and the second count value, can pass through the first count value
Absolute value with the second count value difference can also be calculated as the clocking error according to the first count value and the second count value
Error rate is obtained as the clocking error, it can also be according to formulaThe clocking error is obtained, than passing through
Simple relatively the first count value and the second count value size judge that clock of power meter is more accurate with the presence or absence of deviation, reduce inspection
The error rate of electric energy meter is surveyed, the detection accuracy of clock of power meter deviation is improved.
The other is in example, referring to Fig. 5, the method also includes:
S501, the control module, which obtains, to be counted to get the PPS reference signal in the preset time period
Pre-set count values.
In practical application, the PPS reference signal that GPS module issues may be because of unstable in short-term, so that control module
Abnormal to the counting of PPS reference signal, the first obtained count value is excessive or too small, does not meet reality.In order to improve electric energy
The detection accuracy and accuracy rate of table clock jitter, the first counting to being obtained by PPS reference signal of the control module of the present embodiment
Reasonability screening is carried out, excludes first to obtain in the preset time period because of error count caused by GPS in short-term unstability
To the pre-set count values that the PPS reference signal is counted to get, judge to the pre-set count values.
S502, judges whether the difference of the pre-set count values and standard count value is allowing in difference range.
S503, if the difference of the pre-set count values and standard count value is in the permission difference range, it is determined that institute
Stating pre-set count values is first count value.
If the difference of the pre-set count values and standard count value not in the permission difference range, control module after
It is continuous to obtain the second pre-set count values counted to get in the preset time period to the PPS reference signal.
Judge whether the difference of second pre-set count values and standard count value is allowing in difference range.
If the difference of second pre-set count values and standard count value is in the permission difference range, it is determined that described
Second pre-set count values are first count value.That is, if the default counting counted to get to the PPS reference signal
Value is unqualified always, then control module can obtain always the pre-set count values in preset time period, and be judged, it is known that default
The difference of count value and standard count value is allowing in difference range, improves the precision of detection clock of power meter deviation and accurate
Degree.
In above-described embodiment, by the PPS reference signal of GPS module, high-precision verification is provided for the detection of electric energy meter
Signal, so that detection accuracy is high；Crystal oscillator module does not need to preheat in advance, can directly provide non-oscillating reference signal, save detection
The time of clock of power meter deviation, and reduce costs low；Last control module according to the first count value of PPS reference signal and
Second count value of the clock output signal of electric energy meter determines the clock jitter of the electric energy meter, realizes and quickly detects electric energy meter
Clock jitter improves detection efficiency.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed system and method can pass through others
Mode is realized.For example, system embodiment described above is only schematical, for example, the division of the module or unit,
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling or direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or unit or
Communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of clock of power meter offset detection system characterized by comprising global position system GPS module, crystal oscillator module
And control module；
The GPS module, for sending pulse per second (PPS) PPS reference signal to the control module；
The crystal oscillator module, for sending non-oscillating reference signal to the control module；
The control module, within a preset period of time, carrying out counting to get the first count value to the PPS reference signal,
And carry out counting to get the second count value according to clock output signal of the non-oscillating reference signal to the electric energy meter, according to
First count value and second count value determine the clock jitter of the electric energy meter.
2. clock of power meter offset detection system as described in claim 1, which is characterized in that the control module is specifically used
In:
It is calibrated to obtain the first reference signal according to frequency of the PPS reference signal to the non-oscillating reference signal；
Within a preset period of time, the PPS reference signal is carried out counting to get the first count value, and according to first ginseng
It examines signal the clock output signal of the electric energy meter is carried out counting to get the second count value；
The clock jitter of the electric energy meter is determined according to first count value and second count value.
3. clock of power meter offset detection system as described in claim 1, which is characterized in that the control module includes control
Unit, counting unit and judging unit；
Described control unit is counted in the preset time period for controlling the counting unit；
The counting unit counts to get the first count value for carrying out to the PPS reference signal, and according to the oscillation
Reference signal carries out counting to get the second count value to the clock output signal of the electric energy meter；
The judging unit, for determining that the clock of the electric energy meter is inclined according to first count value and second count value
Difference.
4. clock of power meter offset detection system as claimed in claim 3, which is characterized in that the judging unit is specifically used
In:
The clocking error of the electric energy meter is obtained according to first count value and second count value；
Judge whether the clocking error is above standard error range；
If the clocking error is more than the standard error range, it is determined that there are deviations for the clock of the electric energy meter.
5. clock of power meter offset detection system as claimed in claim 4, which is characterized in that described to be counted according to described first
The clocking error that value and second count value obtain the electric energy meter specifically includes:
Wherein, E is the clocking error, and M is first count value, and N is second count value.
6. such as clock of power meter offset detection system described in any one of claim 1 to 5, which is characterized in that the control mould
Block is also used to:
Obtain the pre-set count values counted to get in the preset time period to the PPS reference signal；
Judge whether the difference of the pre-set count values and standard count value is allowing in difference range；
If the difference of the pre-set count values and standard count value is in the permission difference range, it is determined that the default counting
Value is first count value.
7. a kind of clock of power meter deviation detecting method, suitable for including the electric energy meter of GPS module, crystal oscillator module and control module
Clock jitter detection system, which is characterized in that the described method includes:
The GPS module sends pulse per second (PPS) PPS reference signal to the control module；
The crystal oscillator module sends non-oscillating reference signal to the control module；
Within a preset period of time, the control module carries out counting to get the first count value, Yi Jigen to the PPS reference signal
It carries out counting to get the second count value according to clock output signal of the non-oscillating reference signal to the electric energy meter；
The control module determines the clock jitter of the electric energy meter according to first count value and second count value.
8. clock of power meter deviation detecting method as claimed in claim 7, which is characterized in that described according to the non-oscillating reference
Signal is carried out counting to get the second count value and be specifically included to the clock output signal of the electric energy meter:
It is calibrated to obtain the first reference signal according to frequency of the PPS reference signal to the non-oscillating reference signal；
Within a preset period of time, the clock output signal of the electric energy meter is counted to get according to first reference signal
Second count value.
9. clock of power meter deviation detecting method as claimed in claim 7, which is characterized in that described to be counted according to described first
Value and second count value determine that the clock jitter of the electric energy meter specifically includes:
The clocking error of the electric energy meter is obtained according to first count value and second count value；
Judge whether the clocking error is above standard error range；
If the clocking error is more than the standard error range, it is determined that there are deviations for the clock of the electric energy meter.
10. such as the described in any item clock of power meter deviation detecting methods of claim 7 to 9, which is characterized in that the method is also
Include:
The control module obtains the default counting counted to get in the preset time period to the PPS reference signal
Value；
Judge whether the difference of the pre-set count values and standard count value is allowing in difference range；
If the difference of the pre-set count values and standard count value is in the permission difference range, it is determined that the default counting
Value is first count value.
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