KR101530068B1 - Unusal voltage detecting method, device thereof, and medium storing program source thereof - Google Patents

Abstract

The present invention relates to an unusual voltage detecting device using a maximum value and a minimum value of input voltage and an unusual voltage detecting method. The unusual voltage detecting device comprises: an input voltage receiving unit that receives input voltage; an extraction unit that extracts a maximum value of the input voltage and a minimum voltage of the input voltage; a determination unit that determines whether the input voltage is unusual when the maximum value and the minimum value have the same sign; and an interrupt generating unit that an interrupt corresponding to the determination of the determination unit. According to the unusual voltage detecting device and the unusual voltage detecting method using the maximum value and the minimum value of the input voltage, it is possible to detect whether the input voltage is unusual even when zero-crossing does not occur in waveform of the input voltage.

Description

Technical Field [0001] The present invention relates to a voltage abnormality detecting apparatus, a voltage abnormality detecting method, and a recording medium on which the method is recorded.

The present invention relates to a voltage abnormality detecting device and a detecting method.

Typically, electronic products such as computers, telecommunications equipment, medical equipment, and military equipment are power quality sensitive loads. Because these industrial, commercial, and military loads are interconnected in an automated process, the power system to which these loads are connected is highly susceptible to power quality.

Such power quality is divided into voltage quality and current quality, which are voltage swell / sag, undervoltage and under voltage, interruption, noise, It deals with other conditions such as DC Offset, Harmonics, lnterharmonics, Notching, Voltage Imbalance, Voltage Fluctuation / Flicker, and current quality is affected by current distortion as the nonlinear load increases. Such as the occurrence of voltage distortion, and the like.

On the other hand, the monitoring device for the power quality is a means for monitoring the occurrence of an abnormality in the power system and the load device, which is connected between the power system (power system in power generation and transmission and distribution stages) If an abnormality occurs in the equipment, the circuit between the power system and the load equipment is cut off to protect the power system and the load equipment or analyze the power quality so that the accident can be prevented in advance.

To this end, the apparatus for monitoring power quality according to the related art includes sampling and converting analog voltage and current signals into digital data, calculating an RMS (Root Mean Square) using the converted digital data, We used a method to detect the occurrence of an accident by comparing the rms value with the reference value.

However, when zero crossing does not occur in the waveform of the input voltage, the SAG or SWELL calculation operation can not be performed normally, and the MCU has a problem that the voltage can not be determined.

Korean Patent Publication No. 1020110094431

A problem to be solved by an embodiment of the present invention is to provide a voltage abnormality detecting apparatus and method using a maximum value and a minimum value of an input voltage capable of detecting abnormality of an input voltage even when a waveform of an input voltage does not cause zero crossing .

According to an embodiment of the present invention, there is provided an input voltage detecting apparatus comprising an input voltage receiving unit for receiving an input voltage, an extracting unit for extracting a maximum value of the input voltage and a minimum value of the input voltage, And an interrupt generation unit for generating an interrupt corresponding to the determination of the determination unit.

In one embodiment, the extracting unit may obtain a value of a first input voltage and a value of a second input voltage included in a plurality of the input voltage values received by the input voltage receiving unit, The maximum value and the minimum value may be extracted using the difference between the first input voltage and the second input voltage.

In another embodiment, the extractor may select the value of the first input voltage as the maximum value when the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is a positive value, The value of the second input voltage may be selected as the maximum value when the value obtained by subtracting the value of the second input voltage from the value of the second input voltage is negative.

In another embodiment, the extraction unit may select the value of the second input voltage as the minimum value when the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is positive, The value of the first input voltage may be selected as the minimum value when the value obtained by subtracting the value of the second input voltage from the value of the second input voltage is negative.

In another embodiment, the extracting unit may obtain a value of a first input voltage and a value of a second input voltage included in a plurality of the input voltage values received by the input voltage receiving unit, When the value obtained by subtracting the value of the second input voltage from the value of the second input voltage is 0, the interrupt generation unit may request to generate an interrupt.

In another embodiment, the determination unit may determine an abnormality of the input voltage when the maximum value and the minimum value are both positive.

In another embodiment, the determination unit may determine an abnormality of the input voltage when both of the maximum value and the minimum value are negative.

According to another embodiment of the present invention, there is provided a method of controlling an input voltage, comprising: receiving an input voltage; extracting a maximum value and a minimum value of the input voltage; determining whether the input voltage is abnormal if the maximum value and the minimum value have the same sign; And generating an interrupt based on whether the input voltage is abnormal or not.

In one embodiment, the step of extracting the maximum value and the minimum value of the input voltage may include obtaining a value of a first input voltage and a value of a second input voltage included in a plurality of the input voltage values, The maximum value and the minimum value may be extracted using the difference between the voltage value and the second input voltage value.

In another embodiment of the present invention, the step of extracting the maximum and minimum values of the input voltage may include: if the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is positive, And when the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is negative, the value of the second input voltage may be selected as the maximum value.

In another embodiment of the present invention, the step of extracting the maximum and minimum values of the input voltage may include: if the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is positive, And the first input voltage may be selected as the minimum value when the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is negative.

In another embodiment, the step of extracting the maximum value and the minimum value of the input voltage may include obtaining a value of a first input voltage and a value of a second input voltage included in the plurality of input voltage values received by the receiving unit If the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is 0, the controller may request the interrupt generation unit to generate an interrupt.

In yet another embodiment, the step of determining whether the input voltage is abnormal may determine an abnormality of the input voltage when the maximum value and the minimum value are both positive.

In another embodiment, the step of determining whether the input voltage is abnormal may determine an abnormality of the input voltage when the maximum value and the minimum value are negative.

According to another aspect of the present invention, there is provided a recording medium on which a computer-readable program for performing a voltage anomaly detection method is recorded.

The apparatus and method for detecting and detecting a voltage abnormality using the maximum and minimum values of the input voltage according to an embodiment of the present invention can detect an abnormality of the input voltage even when the waveform of the input voltage does not cause zero crossing.

1 is a graph showing a method of detecting SAG or SWELL.
2 shows an abnormal state of the input voltage.
FIG. 3 illustrates a voltage anomaly detection apparatus using a maximum value and a minimum value of an input voltage according to an embodiment of the present invention.
4 is a flowchart illustrating a voltage anomaly detection method using a maximum value and a minimum value of an input voltage according to the present embodiment.
5 is a flowchart illustrating a voltage anomaly detection method using a maximum value and a minimum value of an input voltage according to the present embodiment.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. As used herein, terms used in the present invention are selected from general terms that are widely used in the present invention while taking into account the functions of the present invention, but these may vary depending on the intention or custom of a person skilled in the art or the emergence of new technologies. In addition, in certain cases, there may be a term arbitrarily selected by the applicant, in which case the meaning thereof will be described in the description of the corresponding invention. Therefore, it is intended that the terminology used herein should be interpreted based on the meaning of the term rather than on the name of the term, and on the entire contents of the specification.

1 is a graph showing a method of detecting SAG or SWELL.

Referring to FIG. 1, the input voltage A has a sinusoidal characteristic. The sinusoidal wave has a constant period and has a characteristic that varies between a maximum value and a minimum value. The P section of the input voltage (A) has a maximum value. The Q section and the S section of the input voltage (A) have the minimum value. However, the R section of the input voltage (A) has a value that does not reach the maximum value. The R section of the input voltage (A) is referred to as SAG.

Although it is not shown in FIG. 1, it may have a value larger than the maximum value of the section P in the R section of the input voltage A. The R section of the input voltage A is referred to as SWELL. When the absolute value B of the input voltage A is obtained (P1 section, Q1 section, R1 section and S1 section) and accumulating the absolute value B every half period, the P section, Q section and (R2 section) smaller than the value of the S section (P2 section, Q2 section and S2 section). A SAG interrupt signal may be generated after the R2 section.

An accumulator for accumulating the absolute value of the input voltage every predetermined period, a sampling unit for sampling the accumulated absolute value of the absolute value of the input voltage every cycle, a sampled input An evaluation unit for evaluating the quality of the input voltage using the accumulated maximum value of the voltage; and an input unit for monitoring an applied input voltage and sampling the absolute value accumulated maximum value of the input voltage of the sampling unit every time the input voltage reaches a predetermined time And the control unit controls the absolute value of the input voltage accumulated in the accumulation unit to be initialized so as to detect the SAG and the SWELL.

2 (a), 2 (b) and 2 (c) show an abnormal state of the input voltage.

Referring to Fig. 2, in (a) of Fig. 2, there is no zero crossing, and the maximum value and the minimum value both have a positive value. In FIG. 2 (b), there is no zero crossing, and both of the maximum value and the minimum value are negative. It has a fixed zero value in FIG. 2 (c), and the accumulated value can not be obtained. Therefore, in an abnormal situation such as (a), (b) and (c), an interrupt signal can not be generated using the accumulated value by using the monitoring apparatus.

FIG. 3 illustrates a voltage anomaly detection apparatus using a maximum value and a minimum value of an input voltage according to an embodiment of the present invention.

3, a voltage abnormality detecting apparatus 100 using a maximum value and a minimum value of an input voltage Vi according to an embodiment of the present invention includes an input voltage receiving unit 110, an extracting unit 120, a determining unit 130 and an interrupt generator 140. [ The input voltage receiving unit 110 may receive the input voltage Vi. Herein, the input voltage Vi may include a commercial voltage. For example, the commercial voltage may be a voltage of 220V at a frequency of 60Hz.

The extraction unit 120 may extract the maximum value and the minimum value from the input voltage Vi. The extraction unit 120 obtains the values of the first input voltage and the second input voltage included in the values of the plurality of input voltages Vi received by the input voltage receiving unit 110, The maximum value and the minimum value can be extracted using the difference between the first input voltage and the second input voltage. More specifically, the extraction unit 120 may select the value of the first input voltage as the maximum value when the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is positive. If the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is a negative value, the value of the second input voltage may be selected as the maximum value.

Furthermore, if the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is positive, the extraction unit 120 may select the value of the second input voltage as the minimum value. On the other hand, when the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is negative, the value of the first input voltage can be selected as the minimum value. If the value obtained by subtracting the value of the second input voltage from the value of the first input voltage is 0, the interrupt generation unit 140 may be requested to generate an interrupt.

The determination unit 130 can determine whether the input voltage Vi is abnormal if the maximum value and the minimum value have the same sign. The determination unit 130 may determine an abnormality of the input voltage when both the maximum value and the minimum value are positive. In addition, the determination unit 130 may determine an abnormality of the input voltage when the maximum value and the minimum value are negative.

The interrupt generation unit 140 may generate an interrupt signal when the determination unit 130 determines that the error is abnormal. The generated interrupt signal can be sent to the MCU.

4 is a flowchart illustrating a voltage anomaly detection method using a maximum value and a minimum value of an input voltage according to the present embodiment.

Referring to FIG. 4, a voltage abnormality detection method using a maximum value and a minimum value of an input voltage according to an embodiment of the present invention includes receiving an input voltage (S401), extracting a maximum value and a minimum value of the input voltage (S402), determining whether the input voltage is abnormal (S403) if the maximum value and the minimum value have the same sign, and generating an interrupt (S404) based on the abnormality of the input voltage .

5 is a flowchart illustrating a voltage anomaly detection method using a maximum value and a minimum value of an input voltage according to the present embodiment.

Referring to FIG. 5, in step S501, the input voltage values V1 and V2 are input. Herein, V1 and V2 may include a value input in the time order among the values of the sinusoidal input voltage.

It is possible to judge whether the value obtained by subtracting V2 from V1 is positive in step S502. If the value obtained by subtracting V2 from V1 is positive, V1 can be selected in step S503.

It can be determined in step S504 whether it has been performed for one cycle. If V1 is selected after steps S501 to S504 have been performed for one period, V1 may be set to V _MAX in step S505.

If the value obtained by subtracting V2 from V1 in step S502 is not a positive number, it can be determined in step S506 whether the value obtained by subtracting V2 from V1 is negative.

If the value obtained by subtracting V2 from V1 is negative, it is determined in step S507 whether or not the operation has been performed for one period. If the operation has been performed for one period, V2 can be set to V _MIN in step S508.

If the value obtained by subtracting V2 from V1 in step S506 is not negative, V1 and V2 are equal to each other, so that an interrupt signal can be generated in step S509. This case corresponds to Fig. 2 (c).

In step S510, V _MAX And whether V _MIN obtained in step S508 are all positive, and V _MAX And V _min are all positive numbers, it is possible to generate an interrupt signal that warns an abnormality of the input voltage in step S511. This case corresponds to Fig. 2 (a). V _MAX And V _min are both negative, an interrupt signal can be generated to warn the abnormality of the input voltage in step S511. This case corresponds to Fig. 2 (c).

If V _MAX Is positive and V _MIN is negative, the monitoring device may operate in step S512. The monitoring device includes a step of calculating an absolute value of an input voltage, a step of accumulating and outputting an absolute value of an input voltage at regular intervals, a step of sampling an absolute value cumulative maximum value of an input voltage at each cycle, Evaluating the quality of the input voltage by using the absolute value cumulative maximum value of the input voltage and monitoring the applied input voltage so that the absolute value cumulative maximum value of the input voltage is sampled every time the input voltage reaches a predetermined point, So that the absolute value of the input voltage is initialized.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art It will be possible. An exemplary storage medium would be capable of associating with the processor so that the processor could read information from, and write information to, the storage medium. Alternatively, the storage medium may be incorporated into the processor. The processor and the storage medium may reside in an ASIC. The ASIC may be located within the user terminal. Alternatively, the processor and the storage medium may reside as separate components in a user terminal.

All of the processes described above may be implemented within one or more general purpose or special purpose computers or software code modules executed by processors, and may be fully automated via the software code modules. The code modules may be stored on any type of computer-readable medium or on a collection of other computer storage devices or storage devices. Some or all of the above methods may alternatively be implemented within specialized computer hardware.

All of the methods and tasks described herein may be performed by a computer system and be fully automated. The computer system, in some cases, may be a computer system or a plurality of separate computers or computing devices (e.g., physical servers, workstations, , Storage arrays, etc.). Each such computing device typically includes a processor (or a collection of multiple processors or a circuit or a circuit, e.g., a module) that executes program instructions or modules stored in memory or other non-transitory computer- to be. Although some or all of the various functions described herein may be implemented as application-specific circuitry (e.g., ASICs or FPGAs) in a computer system, the various functions described may be implemented with such program instructions . When the computer system includes a plurality of computing devices, the devices may not be deployed in the same location, but may be deployed together. The results of the disclosed methods and tasks may be permanently stored in different states by solid state memory chips and / or by transducing physical storage devices such as magnetic disks.

The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100: Voltage abnormality detecting device
110: pressure voltage receiver
120:
130:
140:

Claims (15)

An input voltage receiver for receiving an analog voltage signal;
Calculating a difference value between a first voltage value of the analog voltage signal measured at a previous time point and a second voltage value of the analog voltage signal measured at a current point of time and based on the sign of the calculated difference value, An extraction unit for extracting a maximum value and a minimum value of the minimum value;
A determination unit for determining whether the analog voltage signal is abnormal if the maximum value and the minimum value have the same sign; And
And an interrupt generation unit for generating an interrupt corresponding to the determination of the determination unit,
The extraction unit extracts the maximum value and the minimum value of the analog voltage signal by performing the difference value calculation for one period of the analog voltage signal
Voltage anomaly detection device.
delete The apparatus according to claim 1,
And selects the first voltage value as the maximum value when the value obtained by subtracting the second voltage value from the first voltage value is positive,
And selects the second voltage value as the maximum value when the value obtained by subtracting the second voltage value from the first voltage value is a negative value.
The apparatus according to claim 1,
When the value obtained by subtracting the second voltage value from the first voltage value is positive, the second voltage value is selected as the minimum value,
And selects the first voltage value as the minimum value when a value obtained by subtracting the second voltage value from the first voltage value is a negative value.
The apparatus according to claim 1,
And when the value obtained by subtracting the second voltage value from the first voltage value is 0, requests the interrupt generation unit to generate an interrupt.
The apparatus of claim 1,
And determines an abnormality of the analog voltage signal when the maximum value and the minimum value are both positive.
The apparatus of claim 1,
And determines an abnormality of the analog voltage signal when both of the maximum value and the minimum value are negative.
Receiving an analog voltage signal;
Calculating a difference value between a first voltage value of the analog voltage signal measured at a previous time point and a second voltage value of the analog voltage signal measured at a current point of time and based on the sign of the calculated difference value, Extracting a maximum value and a minimum value of the minimum value;
Determining whether the analog voltage signal is abnormal if the maximum value and the minimum value have the same sign; And
Generating an interrupt based on whether the analog voltage signal is abnormal,
The step of extracting the maximum value and the minimum value includes extracting a maximum value and a minimum value of the analog voltage signal by performing the difference value calculation for one period of the analog voltage signal
Voltage anomaly detection method.
delete 9. The method of claim 8, wherein extracting the maximum and minimum values comprises:
And selects the first voltage value as the maximum value when the value obtained by subtracting the second voltage value from the first voltage value is positive,
Wherein the second voltage value is selected as the maximum value when a value obtained by subtracting the second voltage value from the first voltage value is a negative value.
9. The method of claim 8, wherein extracting the maximum and minimum values comprises:
When the value obtained by subtracting the second voltage value from the first voltage value is positive, the second voltage value is selected as the minimum value,
And selects the first voltage value as the minimum value when the value obtained by subtracting the second voltage value from the first voltage value is a negative value.
9. The method of claim 8,
And generating the interrupt if the value obtained by subtracting the second voltage value from the first voltage value is zero.
The method of claim 8, wherein the step of determining whether the analog voltage signal is abnormal includes:
And determining an abnormality of the analog voltage signal when the maximum value and the minimum value are both positive.
The method of claim 8, wherein the step of determining whether the analog voltage signal is abnormal includes:
And determining an abnormality of the analog voltage signal when both the maximum value and the minimum value are negative.
A recording medium on which a program for performing a voltage abnormality detection method according to any one of claims 8, 10, 11, 12, 13 and 14 is recorded.

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