CN109444643A - A kind of single-phase sinusoidal signal power down rapid detection method and system - Google Patents
A kind of single-phase sinusoidal signal power down rapid detection method and system Download PDFInfo
- Publication number
- CN109444643A CN109444643A CN201811564206.1A CN201811564206A CN109444643A CN 109444643 A CN109444643 A CN 109444643A CN 201811564206 A CN201811564206 A CN 201811564206A CN 109444643 A CN109444643 A CN 109444643A
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- signal
- power down
- slope
- phase sinusoidal
- instantaneous value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention discloses a kind of single-phase sinusoidal signal power down rapid detection method and systems, comprising: using the single-phase sinusoidal instantaneous value signal of sensor detection；Carrying out pretreatment to the single-phase sinusoidal instantaneous value signal of sensor output is to adapt to analog-to-digital conversion；Pretreated single-phase sinusoidal instantaneous value signal is subjected to the analog-to-digital conversion, obtains corresponding digital signal；The digital signal is sampled as follows: digital sample values being read with frequency fs and obtain sinusoidal signal instantaneous value v (k-1) divided by downsampling factor, and obtain the sampled value v (k) of next interrupt cycle in the same way；In k-th of interrupt cycle, the absolute value of slope is calculated | Slope (k) |；Will | Slope (k) | the greatest gradient Slope with preset sinusoidal signalmaxCompare, according to table result judge input signal whether power down.The beneficial effects of the practice of the present invention is that algorithm is simple, and operand is small, and dynamic property is good.
Description
Technical field
The present invention relates to electronic measuring technology fields, quickly examine more specifically to a kind of single-phase sinusoidal signal power down
Survey method and system.
Background technique
In many electronic equipments, generally require detection single-phase input voltage etc. sinusoidal signals whether power down.The prior art
In, for three-phase sinusoidal signal, the amplitude of three-phase sinusoidal signal can be calculated in real time by the method for coordinate transform, then with rated value
Be compared judgement, thus obtain whether power down.But for single-phase sinusoidal magnitude value signal, coordinate transformation method is simultaneously not suitable for,
Usual method is to compare sinusoidal signal instantaneous value with standard value in the prior art, is sentenced when instantaneous sampling value is less than a certain value
Determine sinusoidal signal power down.This calculation method is reliability, often selects lower by a reference value being compared, power down at this time is
A period of time occurs, therefore detection delay is big, dynamic response characteristic is not ideal enough.
Summary of the invention
The technical problem to be solved in the present invention is that sinusoidal signal instantaneous value and standard value are done ratio for the prior art
Compared with when instantaneous sampling value is less than a certain value, the method detection delay of judgement sinusoidal signal power down is big, and dynamic response characteristic is inadequate
Ideal technological deficiency provides a kind of single-phase sinusoidal signal power down rapid detection method and system.
Wherein one side according to the present invention, the present invention are to solve its technical problem, and used technical solution is: providing
A kind of single-phase sinusoidal signal power down rapid detection method, comprises the following steps:
S1: using the single-phase sinusoidal instantaneous value signal of sensor detection；
S2: the single-phase sinusoidal instantaneous value signal of sensor output is pre-processed to adapt to analog-to-digital conversion；
S3: pretreated single-phase sinusoidal instantaneous value signal is subjected to the analog-to-digital conversion, obtains corresponding digital signal；
S4: the digital signal is sampled as follows: digital sample values being read with frequency fs and are obtained divided by downsampling factor
To sinusoidal signal instantaneous value v (k-1), and the sampled value v (k) of next interrupt cycle is obtained in the same way；Wherein, fs is
Interruption frequency is preset, the k in formula indicates k-th of interrupt cycle；
S5: in k-th of interrupt cycle, the absolute value of slope S lope (k) is calculated by following formula:
| Slope (k) |=| v (k)-v (k-1) | fs；
S7: by the greatest gradient Slope of the absolute value of Slope (k) and preset sinusoidal signalmaxIt compares, according to comparing
As a result judge input signal whether power down.
Further, in single-phase sinusoidal signal power down rapid detection method of the invention, the single-phase sinusoidal instantaneous value
Signal refers to voltage signal or current signal in time.
Further, the judgment rule of step S7 is specific in single-phase sinusoidal signal power down rapid detection method of the invention
Are as follows:
If | Slope (k) |-SlopemaxGreater than preset positive value, then input signal power down is determined, otherwise determine input
The non-power down of signal.
Further, the judgment rule of step S7 is specific in single-phase sinusoidal signal power down rapid detection method of the invention
Are as follows:
Within a continuous period, the judgement in multiple and different interrupt cycles is carried out using same method, at this
In multiple judgements, if | Slope (k) | the total degree that-Slopemax is greater than preset positive value is more than preset times, determines to input
Otherwise signal power down determines the non-power down of input signal.
Further, in single-phase sinusoidal signal power down rapid detection method of the invention, the pretreatment refers to progress
Filtering and voltage magnitude adjustment.
The present invention is to solve its technical problem to additionally provide a kind of single-phase sinusoidal signal power down rapid detection system, comprising such as
Lower module:
Sensor detection module, for detecting single-phase sinusoidal magnitude value signal；
Detection module is pre-processed, is to adapt to mould for carrying out pretreatment to the single-phase sinusoidal instantaneous value signal that sensor exports
Number conversion；
Analog-to-digital conversion module is obtained for pretreated single-phase sinusoidal instantaneous value signal to be carried out the analog-to-digital conversion
Corresponding digital signal；
Instantaneous value sampling module, for sampling the digital signal as follows: reading digital sample values with frequency fs
And sinusoidal signal instantaneous value v (k-1) is obtained divided by downsampling factor, and obtain the sampling of next interrupt cycle in the same way
Value v (k)；Wherein, fs is default interruption frequency, and the k in formula indicates k-th of interrupt cycle；
Slope computing module, for calculating the exhausted of slope S lope (k) by following formula in k-th of interrupt cycle
To value:
| Slope (k) |=| v (k)-v (k-1) | fs；
Power down judgment module is used for the greatest gradient Slope of the absolute value of Slope (k) and preset sinusoidal signalmax
Compare, according to table result judge input signal whether power down.
Further, in single-phase sinusoidal signal power down rapid detection system of the invention, the single-phase sinusoidal instantaneous value
Signal refers to voltage signal or current signal in time.
Further, in single-phase sinusoidal signal power down rapid detection system of the invention, the judgement of power down judgment module
Rule specifically:
If | Slope (k) |-SlopemaxGreater than preset positive value, then input signal power down is determined, otherwise determine input
The non-power down of signal.
Further, in single-phase sinusoidal signal power down rapid detection system of the invention, the judgement of power down judgment module
Rule specifically:
Within a continuous period, the judgement in multiple and different interrupt cycles is carried out using same method, at this
In multiple judgements, if | Slope (k) | the total degree that-Slopemax is greater than preset positive value is more than preset times, determines to input
Otherwise signal power down determines the non-power down of input signal.
Further, in single-phase sinusoidal signal power down rapid detection system of the invention, the pretreatment refers to progress
Filtering and voltage magnitude adjustment.
Implement single-phase sinusoidal signal power down rapid detection method and system of the invention, has the advantages that this hair
Bright need adjacent double sampling value can current slope, and then judge whether that power down occurs, this algorithm is simple, fortune
Calculation amount is small, and dynamic property is good.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the hardware detecting circuit that single-phase one embodiment of sinusoidal signal power down rapid detection method of the invention is applicable in
Figure；
Fig. 2 is the flow chart of single-phase one embodiment of sinusoidal signal power down rapid detection method of the invention；
Fig. 3 is the schematic diagram of single-phase one embodiment of sinusoidal signal power down rapid detection system of the invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
Fig. 1 is the example of hardware detecting circuit be applicable according to the method for the present invention.It include sensor, conditioning circuit with
And digitial controller.
Method of the invention when being executed, detects single-phase sinusoidal instantaneous value signal, sensor using sensor special first
Output is single-phase sinusoidal voltage or current signal, i.e., using x-axis as the time, using y-axis as voltage or current output waveform.Conditioning
The sampled signal that circuit exports sensor be filtered with transformation (purpose of transformation is to adapt it to subsequent analog-to-digital conversion mould
Block, such as adjustment amplitude voltage etc., prevent voltage too large or too small) it is sent into digitial controller (generally DSP, single-chip microcontroller afterwards
Or ARM chip) analog-to-digital conversion module.
Analog-to-digital conversion module samples the signal after analog-to-digital conversion as follows: digitial controller is with frequency fs (during fs is
Disconnected frequency, generally kHz) it reads a digital sample values and obtains sinusoidal signal instantaneous value v (k-1) divided by downsampling factor
And save, digitial controller obtains the sampled value v (k) of next interrupt cycle in the same way.K in formula is indicated k-th
Interrupt cycle.
Digitial controller calculates slope as follows:
In k-th of interrupt cycle, method of the invention calculates sinusoidal signal slope S lope (k) by following formula
Absolute value:
| Slope (k) |=| v (k)-v (k-1) | fs
| Slope (k) |=| v (k)-v (k-1) | fs
In above formula, v (k-1) and v (k) be respectively kth -1 and k-th interrupt cycle sinusoidal signal instantaneous sampling value.From formula
In it is visible, it is only necessary to the sampled value of two neighboring interrupt cycle can be obtained by slope, thus algorithm is simple, and calculation amount is small, move
State property can be good.
In+1 interrupt cycle of kth, it is only necessary to v (k) be replaced v (k-1), v (k+1) is replaced v (k), can be obtained
Newest sinusoidal signal slope.By taking the sampled data in some period as an example, according to sampling time sequencing, sampled data
Successively are as follows: v (0), v (1), v (0) ..., v (k-1), v (k), v (k+1), every time calculate slope when, be two neighboring sampled point
Data carry out slope calculating.
Fig. 2 is the program flow diagram of detection of power loss algorithm according to an embodiment of the invention.Program reads calculating first
Current sinusoidal signal transient sampled value v (k) then calculates separately the oblique of Current interrupt period according to the slope calculation formula of derivation
Rate, then the absolute value of slope and the greatest gradient of sinusoidal signal compare to determine whether power down.To make next interruption week
Phase can accurately determine whether that power down occurs.Wherein, the greatest gradient of sinusoidal signal is to be solved to obtain according to the input of ideal signal,
It is 1 by its greatest gradient known to its derivative y=cosx such as key player on a team's signal of y=sinx.
By taking switching frequency 10kHz detects the amplitude and phase of the single-phase sinusoidal instantaneous value signal of a 50Hz as an example, when detection,
Every 100us samples the primary sinusoidal signal.Traditional power down method needs to determine that sampled value is less than 50% ability of amplitude reliably
Judgement power down, time of cost may be Millisecond, and power failure detection method proposed by the present invention only need to save 2 this just
The instantaneous sampling value of string signal, and calculate slope just and can be determined whether that power down, time-consuming 100us occurs.It is in practice to avoid sine
Accidental influence of the interference to detection of power loss of signal, can within a continuous period to the absolute value of slope in preset maximum
Slope S lopemaxRepeatedly compared, only instantaneous slope absolute value is greater than sinusoidal signal greatest gradient and reaches preset number
(preset times are generally higher than 1 and are less than the comparison total degree repeatedly compared), is just determined as power down.Nevertheless, opposite pass
System power failure detection method, detection algorithm proposed by the invention are obviously shortened power down detection time.
With reference to Fig. 3, according to another aspect of the present invention, the present invention is to solve its technical problem, is additionally provided a kind of single-phase
Sinusoidal signal power down rapid detection system includes following module:
Sensor detection module 31, for detecting single-phase sinusoidal instantaneous value signal；The single-phase sinusoidal instantaneous value signal is
Refer to voltage signal or current signal in time；
Detection module 32 is pre-processed, is to adapt to for carrying out pretreatment to the single-phase sinusoidal instantaneous value signal that sensor exports
Analog-to-digital conversion；The pretreatment refers to be filtered to be adjusted with voltage magnitude；
Analog-to-digital conversion module 33 is obtained for pretreated single-phase sinusoidal instantaneous value signal to be carried out the analog-to-digital conversion
To corresponding digital signal；
Instantaneous value sampling module 34, for sampling the digital signal as follows: reading digital sample with frequency fs
Value simultaneously obtains sinusoidal signal instantaneous value v (k-1) divided by downsampling factor, and obtains adopting for next interrupt cycle in the same way
Sample value v (k)；Wherein, fs is default interruption frequency, and the k in formula indicates k-th of interrupt cycle；
Slope computing module 35, for calculating slope S lope (k) by following formula in k-th of interrupt cycle
Absolute value:
| Slope (k) |=| v (k)-v (k-1) | fs；
Power down judgment module 36, for inciting somebody to action | Slope (k) | the greatest gradient Slope with preset sinusoidal signalmaxDo ratio
Compared with, according to table result judge input signal whether power down.
The judgment rule of power down judgment module 36 specifically: if | Slope (k) |-SlopemaxGreater than preset positive value,
Then determine input signal power down, otherwise determines the non-power down of input signal.Alternatively,
The judgment rule of power down judgment module 36 specifically:
Within a continuous period, the judgement in multiple and different interrupt cycles is carried out using same method, at this
In multiple judgements, if | Slope (k) |-SlopemaxTotal degree greater than preset positive value is more than preset times, then determines to input
Otherwise signal power down determines the non-power down of input signal.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (10)
1. a kind of single-phase sinusoidal signal power down rapid detection method, which is characterized in that comprise the following steps:
S1: using the single-phase sinusoidal instantaneous value signal of sensor detection；
S2: the single-phase sinusoidal instantaneous value signal of sensor output is pre-processed to adapt to analog-to-digital conversion；
S3: pretreated single-phase sinusoidal instantaneous value signal is subjected to the analog-to-digital conversion, obtains corresponding digital signal；
S4: the digital signal is sampled as follows: digital sample values being read with frequency fs and are obtained just divided by downsampling factor
String signal instantaneous value v (k-1), and the sampled value v (k) of next interrupt cycle is obtained in the same way；Wherein, fs is default
Interruption frequency, the k in formula indicate k-th of interrupt cycle；
S5: in k-th of interrupt cycle, the absolute value of slope S lope (k) is calculated by following formula:
| Slope (k) |=| v (k)-v (k-1) | fs；
S7: by the greatest gradient Slope of the absolute value of Slope (k) and preset sinusoidal signalmaxIt compares, according to comparison result
Judge input signal whether power down.
2. single-phase sinusoidal signal power down rapid detection method according to claim 1, which is characterized in that the single-phase sine
Instantaneous value signal refers to voltage signal or current signal in time.
3. single-phase sinusoidal signal power down rapid detection method according to claim 1, which is characterized in that the judgement of step S7
Rule specifically:
If | Slope (k) |-SlopemaxGreater than preset positive value, then determines input signal power down, otherwise determine input signal
Non- power down.
4. single-phase sinusoidal signal power down rapid detection method according to claim 1, which is characterized in that the judgement of step S7
Rule specifically:
Within a continuous period, the judgement in multiple and different interrupt cycles is carried out using same method, it is multiple at this
In judgement, if | Slope (k) | the total degree that-Slopemax is greater than preset positive value is more than preset times, determines input signal
Otherwise power down determines the non-power down of input signal.
5. single-phase sinusoidal signal power down rapid detection method according to claim 1, which is characterized in that the pretreatment is
Finger is filtered to be adjusted with voltage magnitude.
6. a kind of single-phase sinusoidal signal power down rapid detection system, which is characterized in that include following module:
Sensor detection module, for detecting single-phase sinusoidal signal instantaneous value；
Detection module is pre-processed, is to adapt to modulus to turn for carrying out pretreatment to the single-phase sinusoidal instantaneous value signal that sensor exports
It changes；
Analog-to-digital conversion module is corresponded to for pretreated single-phase sinusoidal instantaneous value signal to be carried out the analog-to-digital conversion
Digital signal；
Instantaneous value sampling module, for sampling the digital signal as follows: reading digital sample values with frequency fs and remove
Sinusoidal signal instantaneous value v (k-1) is obtained with downsampling factor, and obtains the sampled value v of next interrupt cycle in the same way
(k)；Wherein, fs is default interruption frequency, and the k in formula indicates k-th of interrupt cycle；
Slope computing module, for calculating the absolute of slope S lope (k) by following formula in k-th of interrupt cycle
Value:
| Slope (k) |=| v (k)-v (k-1) | fs；
Power down judgment module is used for the greatest gradient Slope of the absolute value of Slope (k) and preset sinusoidal signalmaxDo ratio
Compared with, according to table result judge input signal whether power down.
7. single-phase sinusoidal signal power down rapid detection system according to claim 6, which is characterized in that the single-phase sine
Instantaneous value signal refers to voltage signal or current signal in time.
8. single-phase sinusoidal signal power down rapid detection system according to claim 6, which is characterized in that power down judgment module
Judgment rule specifically:
If | Slope (k) |-SlopemaxGreater than preset positive value, then determines input signal power down, otherwise determine input signal
Non- power down.
9. single-phase sinusoidal signal power down rapid detection system according to claim 6, which is characterized in that power down judgment module
Judgment rule specifically:
Within a continuous period, the judgement in multiple and different interrupt cycles is carried out using same method, it is multiple at this
In judgement, if | Slope (k) | the total degree that-Slopemax is greater than preset positive value is more than preset times, determines input signal
Otherwise power down determines the non-power down of input signal.
10. single-phase sinusoidal signal power down rapid detection method according to claim 6, which is characterized in that the pretreatment
Refer to be filtered and be adjusted with voltage magnitude.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816913A (en) * | 2021-01-28 | 2021-05-18 | 厦门拓宝科技有限公司 | Method and device for rapidly detecting power failure of single-phase alternating voltage signal, storage medium, program product and terminal equipment |
| CN113933775A (en) * | 2020-07-14 | 2022-01-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Power failure detection method and system for electric energy meter |
| CN114563753A (en) * | 2021-04-12 | 2022-05-31 | 正泰集团研发中心(上海)有限公司 | Power failure detection method, device and equipment for electric energy meter and computer readable storage medium |
| CN116773894A (en) * | 2023-06-15 | 2023-09-19 | 浙江恒业电子股份有限公司 | Collector power failure detection system and method thereof |
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| CN116773894B (en) * | 2023-06-15 | 2023-12-15 | 浙江恒业电子股份有限公司 | Collector power failure detection system and method thereof |
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Application publication date: 20190308 |