KR20170087199A

KR20170087199A - Apparatus and method for identifying type of electronic device

Info

Publication number: KR20170087199A
Application number: KR1020160006898A
Authority: KR
Inventors: 김종욱; 손준익
Original assignee: 동아대학교 산학협력단
Priority date: 2016-01-20
Filing date: 2016-01-20
Publication date: 2017-07-28
Also published as: KR101770798B1

Abstract

An apparatus and method for identifying an electronic device are provided. An apparatus for identifying a type of electronic apparatus according to an embodiment of the present invention includes an input unit for receiving a consumption current of an electronic apparatus; A calculation unit calculating an average of the consumption currents and calculating a standard deviation and a signal-to-noise ratio of the consumption currents from the average; A determination unit for detecting a change in the level of the consumption current from the standard deviation and determining a representative current level of the consumption current from the detected level change; And an identification unit for identifying the type of the electronic device using at least one of the representative current level and the signal-to-noise ratio.

Description

[0001] APPARATUS AND METHOD FOR IDENTIFYING TYPE OF ELECTRONIC DEVICE [0002]

TECHNICAL FIELD The present invention relates to a technology for automatically identifying a type of an electric appliance using a smart plug, which is a component technology of a smart grid. More specifically, the present invention does not set the type of the electronic device connected to the user when the smart plug is used in an unspecified number of electronic devices in the home or office, but analyzes the waveform of the consumption current to automatically recognize the type of the electronic device Technology.

The Smart Grid is a technology that enables efficient use and management of power energy by combining information and communication technology with traditional transmission and distribution technology. Although AMI (Advanced Metering Infrastructure) is spreading globally in current power meter technology, there is a disadvantage that time and cost are required because it is necessary to replace the existing analog power meter inspection infrastructure.

In contrast, the Smart Plug measures the power, voltage, and current data of an electronic device connected between an outlet and an electronic device in real time, wirelessly transmits the data to a mobile device such as a smart phone, Or to turn on / off the electronic device by the user's command. The smart plug is easier to install than the AMI and has a lower price, so it can be connected to various electronic devices in the home or office. However, it is inconvenient to use the manual or RFID technology to separately identify the type of the electronic device have.

Korean Patent Registration No. 10-1453551 (Oct. 15, 2014)

Though smart plugs are less expensive than AMIs, they are plugged into the electronics of interest for hours, days or more, rather than plugging the smart plugs into the plugs of every home or building electronics, After checking the charge, it is often transferred to another electronic device. At this time, in order to store the power data of the electronic device in the memory of the smart plug or smartphone application, the type of the electronic device should be identified and the result should be made into a code and tagged to the power data. For this purpose, the user can directly input the type and name of the electronic device into the smartphone or identify it with the RFID board, but in this case, there is a disadvantage that additional time and cost are incurred. Also, it would be very convenient if a smart home server that installs several smart plugs in the home or office and collects power data wirelessly can automatically identify the type of the electronic device.

Accordingly, the present invention analyzes the consumption current measured in the smart plug in real time to detect the representative current level of the consumption current according to the change of the operation mode (operation mode) of the electronic device, And a signal-to-noise-ratio characteristic information to identify the type of the currently connected electronic device.

Electronic devices used in homes and offices have a similar number of operating modes and typical consumption current patterns, depending on their type. For example, there are only two modes of switching on / off the PC, refrigerator, and TV, but there are 2 to 4 modes of operation for hair dryers, fans, and microwave ovens. Even in the same operation mode, the size, pattern, and duration of current consumption are different depending on the type of electronic device.

According to an exemplary embodiment of the present invention, there is provided an electronic device including: an input unit for receiving a consumption current of an electronic device; A calculation unit calculating an average of the consumption currents and calculating a standard deviation and a signal-to-noise ratio of the consumption currents from the average; A determination unit for detecting a change in the level of the consumption current from the standard deviation and determining a representative current level of the consumption current from the detected level change; And an identification unit for identifying the type of the electronic device using at least one of the representative current level information and the signal-to-noise ratio.

The determination unit can detect a change in the level of the consumption current by measuring the increase or decrease in the standard deviation.

The calculating unit may calculate an average of the standard deviation, and the determining unit may detect a change in the level of the consumption current from an average of the standard deviation and the standard deviation.

When the time from when the standard deviation is equal to or larger than a predetermined value and the standard deviation becomes larger than a predetermined multiple of the average of the standard deviation to the time when the standard deviation becomes smaller than the average of the standard deviation is equal to or greater than a predetermined value, It can be judged that the level of the consumption current has changed.

The calculation unit may calculate an average of the mean, the standard deviation, and the standard deviation using Equations 1 to 3 below.

[Equation 1]

&Quot; (2) "

&Quot; (3) "

(here,

The average,

Is the standard deviation,

Is the average of the standard deviation, k is the current time, T is the sampling time, I [kT] is the magnitude value (RMS) of the consumption current measured at the kth sampling time, N and M are the size of the set data window box)

Wherein the determination unit compares the level of the consumption current detected when the level change of the consumption current is detected with the representative current level detected and updates the previously detected representative current level in accordance with the comparison result, The level of consumption current can be registered as a new representative current level.

When the difference between the detected consumption current level and the previously detected representative current level is within a set value, the determination unit updates the previously detected representative current level using the following Equation (4) and Equation (5) can do.

&Quot; (4) "

&Quot; (5) "

(Where, I _l 'is the group detected representing current level is the updated value, T _j' is the updated duration representing a current level, I _l is the level of the detected supply current, T _l is the detected I _j is a _jth representative current level whose difference from I _l of the detected representative current level is within a set value and T _j is a duration of the j representative current level)

The judging unit may register the detected consumption current level as a new representative current level when the difference between the detected consumption current level and the previously detected representative current level exceeds a set value.

The identification unit compares the minimum value of the representative current level with the minimum value of the stored representative current level or compares the maximum value of the representative current level with the maximum value of the stored representative current level, The type of the electronic device can be identified by comparing the number of stored representative current levels or comparing the average of the signal-to-noise ratio with the average of the stored signal-to-noise ratio.

According to another exemplary embodiment of the present invention, there is provided a method of controlling an electronic apparatus, Calculating an average of the consumption currents in the calculation unit; Calculating a standard deviation of the consumption current and a signal-to-noise ratio from the average; Detecting a change in the level of the consumption current from the standard deviation; Determining the representative current level of the consumption current from the detected level change; And identifying the type of the electronic device by using at least one of the information of the representative current level and the signal-to-noise ratio in the identifying section.

The step of detecting the level change of the consumption current can detect the level change of the consumption current by measuring the increase or decrease of the standard deviation.

The method of identifying a type of electronic equipment according to claim 1, further comprising calculating an average of the standard deviation in the calculating unit, wherein the step of detecting a change in the level of the consumed current includes calculating an average of the standard deviation and the standard deviation The change in the level of the consumption current can be detected.

Wherein the step of detecting the level change of the consumed current includes detecting a change in the level of the consumption current from a time point at which the standard deviation is equal to or greater than a set value and the standard deviation becomes larger than a predetermined multiple of the standard deviation, It is determined that the level of the consumption current has changed.

The average of the mean, the standard deviation, and the standard deviation may be calculated using the following Equations (1) to (3).

[Equation 1]

&Quot; (2) "

&Quot; (3) "

(here,

The average,

Is the standard deviation,

Wherein the step of determining the representative current level of the consumption current includes the steps of comparing the level of the consumption current detected when the level change of the consumption current is detected with the representative current level detected, The representative current level may be updated or the detected current consumption level may be registered as a new representative current level.

Wherein the step of determining the representative current level of the consumption current comprises the steps of: when the difference between the detected consumption current level and the previously detected representative current level is within a set value, using the following equations (4) and And can update the previously detected representative current level.

&Quot; (4) "

&Quot; (5) "

Wherein the step of determining the representative current level of the consumed current includes the step of comparing the detected current level of the consumed current with a new representative current level when the difference between the detected current level of the consumed current and the previously detected representative current level exceeds a set value, You can register as a level.

The step of identifying the type of the electronic device may include comparing the minimum value of the representative current level with a minimum value of the stored representative current level or comparing the maximum value of the representative current level with the maximum value of the stored representative current level, It is possible to identify the type of the electronic device by comparing the number of representative current levels with the number of pre-stored representative current levels or by comparing the average of the signal-to-noise ratio and the stored signal-to-noise ratio.

According to another exemplary embodiment of the present invention, there is provided an electronic device including: an input unit coupled to hardware for receiving a consumption current of an electronic device; Calculating an average of the consumption currents in the calculation unit; Calculating a standard deviation of the consumption current and a signal-to-noise ratio from the average; Detecting a change in the level of the consumption current from the standard deviation; Determining the representative current level of the consumption current from the detected level change; And a program stored in the recording medium for executing the step of identifying, in the identifying section, the type of the electronic apparatus using at least one of the information of the representative current level and the signal-to-noise ratio.

According to embodiments of the present invention, the type of the electronic device can be automatically identified through analysis of the consumption current of the electronic device. In particular, according to embodiments of the present invention, it is possible to accurately and easily identify the type of the electronic device by considering at least one of the minimum value, the maximum value, the number, and the average of the signal-to-noise ratio of the representative current level. The type identification technology of the electronic device proposed by the present invention can be easily applied to a smart meter such as AMI. That is, when a plurality of smart plugs are installed in an electronic device in a home or an office, and the power consumption data is collected in a server or a host system in the home, When a kind of an electronic device is transmitted by radio with a tag attached thereto, it is possible to easily acquire information on a usage pattern for each electronic device in a home or an office.

In addition, according to embodiments of the present invention, even if an user inserts an arbitrary electronic device into the smart plug in the AMI, the type of the electronic device can be automatically identified and the entire power data can be collected, The power consumption of the entire apparatus can be easily monitored.

In addition, according to embodiments of the present invention, a smart plug is inserted into an electronic device continuously used such as a refrigerator, and the signal-to-noise ratio of consumption current is automatically analyzed to detect an abnormal state or failure of the electronic device, And the like can be additionally implemented.

1 is a block diagram showing a detailed configuration of an electronic device type identifying apparatus according to an embodiment of the present invention;
2 is a diagram illustrating an average and standard deviation of consumption currents of a first electronic device according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an average and standard deviation of consumption currents of a second electronic device according to an embodiment of the present invention; FIG.
FIG. 4 is a diagram illustrating an average of standard deviations of current consumption of a first electronic device according to an embodiment of the present invention; FIG.
5 is an exemplary diagram showing an average of the standard deviation of the consumption current of the second electronic device according to the embodiment of the present invention
6 is an exemplary diagram showing the level of consumption current of the first electronic device according to the embodiment of the present invention
7 is a diagram illustrating an example of a level of consumption current of a second electronic device according to an embodiment of the present invention.
8 is a flowchart for explaining a method of identifying a type of an electronic device according to an embodiment of the present invention.
9 is a flowchart for describing step S808 of FIG. 8 in detail.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to provide a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, this is merely an example and the present invention is not limited thereto.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification. The terms used in the detailed description are intended only to describe embodiments of the invention and should in no way be limiting. Unless specifically stated otherwise, the singular form of a term includes plural forms of meaning. In this description, the expressions "comprising" or "comprising" are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, Should not be construed to preclude the presence or possibility of other features, numbers, steps, operations, elements, portions or combinations thereof.

1 is a block diagram showing a detailed configuration of an electronic device type identifying apparatus 100 according to an embodiment of the present invention. 1, an electronic device type identification apparatus 100 according to an embodiment of the present invention includes an input unit 102, a calculation unit 104, a determination unit 106, and an identification unit 108 do. In the following embodiments, the type identifying apparatus 100 for an electronic device may be mounted as a separate module in a smart plug (not shown), or may be formed integrally with a smart plug. The smart plug measures a current consumption of an electronic device between an electronic device (not shown) and a power supply (not shown), transmits information about the measured current consumption to a mobile device (not shown) such as a smart phone, And receives the control signal from the mobile device to control the operation of the electronic device. However, the type identification device 100 of the electronic device is not necessarily required to be present on the smart plug, and the type identification device 100 of the electronic device may be mounted on, for example, an adapter of an electronic device. Hereinafter, for convenience of explanation, it is assumed that the type identifying apparatus 100 of the electronic device exists as one configuration of the smart plug.

The input unit 102 receives the consumption current of the electronic device. The input unit 102 may be connected to, for example, a consumption current meter (not shown) of the smart plug, and may receive the consumption current of the electronic device from the consumption current meter. The consumption current meter can measure the consumption current of the electronic device in real time and input the measured consumption current to the input unit 102.

The calculation unit 104 calculates an average of consumption currents, and calculates a standard deviation of the consumption current and a signal-to-noise ratio from the average. First, the calculation unit 104 can calculate an average of current consumption using the following equation (1).

[Equation 1]

here,

K is the current time, T is the sampling time, I [kT] is the magnitude value (RMS) of the consumption current measured at the kth sampling time, and N is the size of the set data window.

That is, the calculation unit 104 can calculate the latest average of the N current consumption currents by covering the data of the consumption current inputted to the input unit 102 with the data window of size N.

Further, the calculation unit 104 can calculate the standard deviation of the consumption current using the following equation (2).

&Quot; (2) "

here,

Means the standard deviation of current consumption. That is, the calculation unit 104 can calculate the latest standard deviation of the latest N consumed currents using the calculated consumption current average. As will be described later, the standard deviation can be used to determine whether the level of the consumption current has changed (i.e., whether the operation mode of the electronic device has changed).

In addition, the calculation unit 104 can calculate an average of the standard deviation of consumption currents by using the following equation (3).

&Quot; (3) "

here,

Is the average of the standard deviation of the consumption current, and M is the size of the set data window. As will be described later, the average of the standard deviations can be used to determine whether the level of the current consumption is changed if the fluctuation of the current consumption is severe.

Also, the calculation unit 104 may calculate a signal to noise ratio from the average and standard deviation of the consumption current. The signal-to-noise ratio can be used to determine the shake of the current in a numerical analytical manner in the consumption current waveform. The signal-to-noise ratio may be expressed as a ratio of an average and a standard deviation of current consumption, and may be used to identify the type of electronic equipment as described later.

FIG. 2 is a diagram illustrating average and standard deviation of consumption currents of a first electronic device according to an exemplary embodiment of the present invention. FIG. 3 illustrates average and standard deviation of consumption currents of a second electronic device according to an exemplary embodiment of the present invention. Fig. In the following embodiments, the first electronic device may be, for example, a fan, and the second electronic device may be, for example, a desktop (PC).

Referring to FIG. 2, (a) shows the relationship between the original data (original, indicated by a solid line) of consumption current of the first electronic device (electric fan) measured at a sampling time of 0.5 sec and (Indicated by an average (indicated by a dotted line) of consumption currents calculated, and (b) shows a standard deviation value of consumed current calculated through Equation (2). As shown in FIG. 2 (a), the raw data of the consumption current indicated by the solid line includes a fine noise component, but it can be confirmed that the average value of the consumption current indicated by the dotted line has a cleaner waveform than the original data . Also, as shown in FIG. 2 (b), it can be seen that a large peak occurs in the standard deviation value when the level of the consumption current rapidly changes due to the change of the operation mode of the electronic device. Accordingly, as will be described later, the determination unit 106 can detect a change in the level of the consumed current by measuring the increase or decrease in the standard deviation.

In the case of FIG. 2, since the fluctuation of the consumption current of the first electronic device is not large, the standard deviation value clearly shows a peak. However, in FIG. 3, every time the software application is executed in the second electronic device, It is difficult to know precisely when the level change of the current consumption occurs only with the standard deviation value. Therefore, in this case, the determination unit 106 can detect the level change of the consumption current from the above-described standard deviation and the average of the standard deviation. This will be described in detail with reference to FIGS. 4 and 5. FIG.

4 is a diagram illustrating an average of standard deviations of current consumption of a first electronic device according to an exemplary embodiment of the present invention, Fig. 4 and 5, the solid line represents the standard deviation of the consumption current, and the dotted line represents the average of the standard deviation of the consumption current. FIG. 4 is a graph showing the relationship between the standard deviation value (std, where N is assumed to be 10) of consumption current calculated by applying Equation 2 to the consumption current data of the first electronic device of FIG. 2 and the consumption current data of the first electronic device (Avg-std, where M is assumed to be 10) of the standard deviation of consumption current calculated by applying Equation (3). As shown in FIG. 4, it can be seen that the standard deviation value indicated by the solid line rapidly increases and the average value of the standard deviation increases with the change of the standard deviation value after several sampling times have elapsed. In this case, however, the original standard deviation value rapidly decreases to zero as the consumption current keeps a constant value (level), and becomes smaller than the average of the standard deviation.

5 is a graph showing the relationship between the consumption current standard deviation value (std, where N is assumed to be 10) calculated by applying Equation (2) to the consumption current data of the second electronic device of Fig. 3 and the consumption current (Avg-std, where M is assumed to be 10) of the standard deviation of the consumption current calculated by applying Equation (3) to the data. In FIG. 5, unlike FIG. 4, since random noise components are included in the consumption current data of the second electronic device, it is difficult to find an increase / decrease relationship between the above-described standard deviation value and the average value of the standard deviation.

Accordingly, as will be described later, when the fluctuation of the consumption current is severe, the determination unit 106 determines whether the standard deviation is equal to or greater than a predetermined value (for example, 0.001) and the standard deviation is greater than a predetermined multiple ) Of the standard deviation is equal to or greater than a set value (T _dur ) from the time when the standard deviation becomes larger than the average of the standard deviation. The determination unit 106 updates an average of the consumed current in real time after it is determined that the level of the consumed current has changed, and sets an average of the consumed current calculated up to that time as a new consumed current As shown in FIG.

1, the determination unit 106 detects a change in the level of the consumption current by using at least one of an average of the standard deviation and the standard deviation calculated by the calculation unit 104. [ In the present embodiments, the level of the consumption current means the current magnitude of the consumption current.

As an example, the determination unit 106 can detect the level change of the consumption current by using the standard deviation calculated by the calculation unit 104. [ As described above, the determination unit 106 can detect the change in the level of the consumption current by measuring the increase or decrease in the standard deviation. That is, the determination unit 106 can determine that the level of consumption current has changed when the standard deviation is increased or decreased by more than a predetermined value (i.e., compared with the previous standard deviation).

As another example, the determination unit 106 can detect a change in the level of the consumed current from an average of the standard deviation and the standard deviation calculated by the calculation unit 104 when the shake of the consumption current is severe. As described above, when the fluctuation of the current consumption is severe, the determination unit 106 determines whether the standard deviation is greater than a predetermined value and the standard deviation is greater than a predetermined multiple [alpha] It can be determined that the level of the consumption current has changed when the time until the time when the average of the standard deviations becomes smaller than the average of the standard deviations is equal to or greater than the set value T _dur .

Also, the determination unit 106 can determine the representative current level of the consumption current from the detected level change. The determination unit 106 compares the level of the consumption current detected when the level change of the consumption current is detected with the detected representative current level and updates the previously detected representative current level in accordance with the comparison result, The level of consumption current can be registered as a new representative current level. This will be described in detail with reference to FIGS. 6 and 7. FIG.

FIG. 6 is a diagram illustrating a level of a consumption current of a first electronic device according to an exemplary embodiment of the present invention, FIG. 7 is an exemplary diagram illustrating a level of a consumption current of a second electronic device according to an exemplary embodiment of the present invention to be. Here, it is assumed that the level of the consumption current of the first electronic device and the level of the consumption current of the second electronic device are measured in a state where? = 2 and T _dur = 3.

As shown in FIGS. 6 and 7, it can be seen that four current consumption levels are observed for the first electronic device and two consumption current levels for the second electronic device. However, in the case of the second electronic device, it can be seen that the consumption current level shakes considerably as the software is executed after the power is turned on.

According to the embodiments of the present invention, it is possible to measure the number, size, duration, and the like of the representative current level of the consumption current of the electronic device, and to identify the type of the electronic device from these values. For this, the determination unit 106 may firstly detect the level of consumption current and then cluster the levels of similar values to one representative current level. Then, the determination unit 106 compares the detected consumption current level with the detected representative current level every time a new consumption current level is detected, and outputs a representative current (which is closest to the detected consumption current level) You can calculate the difference from the level. If the difference is within the same level tolerance (?), The determination unit (106) determines that the detected consumption current level is included in one of the representative current levels detected, and the detected consumption The representative current level can be updated by calculating a weighted average value reflecting the current. Specifically, when the difference between the detected consumption current level and the detected representative current level is within the set value, the determination unit 106 uses the following expression (4) and (5) You can update the level.

&Quot; (4) "

&Quot; (5) "

Here, I _l 'is the group detected representing current level is the updated value, T _j' is the updated duration representing a current level, I _l is the level, T _l of the detected supply current is detected the consumption I _j is a _jth representative current level whose difference from I _l of the detected representative current level is within a set value, and T _j is a duration of the j representative current level.

At this time, the same level allowable value? Can be a value between 2% and 20% of the maximum value of the detected consumption current level. If the same level allowable value? Is set to be larger than necessary, a new current consumption level can not be accurately detected when the current consumption level is finely changed as in the case of the first electronic device in FIG. 2, Is set to be smaller than necessary, a problem may arise that the same current consumption level as seen in the naked eye is judged to be at a different level as in the case of the second electronic device in Fig. Therefore, in the embodiments of the present invention, when the fluctuation of the consumption current is small, the same level allowable value? Is set to be close to 2% of the maximum consumption current value and when the current fluctuation is large, ) Is set to be close to 20% of the maximum consumption current value.

1, the identification unit 108 identifies the type of the electronic device using at least one of the representative current level information of the consumption current and the signal-to-noise ratio. Here, the representative current level information may be, for example, a minimum value, a maximum value, a number, or the like of the representative current level. Specifically, the identification unit 108 compares the minimum value of the representative current level with the minimum value of the stored representative current level, or compares the maximum value of the representative current level with the maximum value of the stored representative current level, And the type of the electronic device can be identified by comparing the number of the stored representative current levels or by comparing the average of the signal-to-noise ratio and the stored signal-to-noise ratio. The minimum value, the maximum value, the number and the signal-to-noise ratio of the previously stored representative current level may be classified and stored for each electronic device. In this way, the identification unit 108 can accurately and easily identify the type of the electronic device in consideration of at least one of the minimum value, the maximum value, the number, and the average of the signal-to-noise ratios of the representative current levels. If the type of the electronic device is identified by taking into consideration both the average value of the representative current level, the maximum value, the number, and the average of the signal-to-noise ratios in the identification unit 108, the accuracy of the identification can be further improved.

As described above, the calculation unit 104 can calculate the signal-to-noise ratio from the average and standard deviation of the consumption current. The calculation unit 104 calculates a signal-to-noise ratio (S / N) of the consumed current

) Can be calculated. This can be expressed by Equation (6) below.

&Quot; (6) "

The average value of the signal-to-noise ratio is 3963.67 for the consumption current of the first electronic device of FIG. 2 (i.e., the fan) and the average value of the signal-to-noise ratio for the consumption current of the second electronic device (i.e., PC) of FIG. 3 is 64.83 . At this time, the larger the shake of the current consumption, the larger the standard deviation and the signal-to-noise ratio can be reduced. The same level allowable value? Is determined on the basis of the signal-to-noise ratio so that the same level allowable value? In the case of the first electronic device is 2% of the maximum consumed current value and the same level allowable value? ) Is set to 20% of the maximum consumption current, the representative current level of the consumption current of the first electronic device detected in FIG. 6 is as follows.

● Level 1: 4.9mA (duration 108.5 seconds, share 9.7%)

● Level 2: 115.0mA (duration 306 seconds, 27.2% share)

● Level 3: 124.5mA (duration 471.5 seconds, share 42.0%)

● Level 4: 146.5mA (duration 237.5 seconds, 21.1% share)

The representative current level of the consumption current of the second electronic device detected in FIG. 7 is as follows.

● Level 1: 49.9 mA (duration 729 seconds, share 28.9%)

● Level 2: 543.1 mA (duration 1796 seconds, 71.1% share)

According to embodiments of the present invention, the average current level, duration, and signal-to-noise ratio of consumption currents of various household appliances are listed in Table 1 below.

Type of household appliances Representative current level (duration, occupancy) Average signal-to-noise ratio TV 34.1 mA (734 sec, 27.8%) - 214 mA (1903 sec, 72.2%) 157.93 Refrigerator 4.0 mA (1575 s, 63.4%) - 558.4 mA (899 s, 36.2%) -3.848 A (11 s, 0.4% 68.69 PC 49.9 mA (729 seconds, 28.9%) - 543.1 mA (1796 seconds, 71.1%) 64.83 printer 232mA (1514 seconds, 94.5%) - 2.55A (89 seconds, 5.5%) 89.18 Microwave 307.2 mA (147 seconds, 70.9%) - 7.16 A (60 seconds, 29.1%) 704.60 fan 4.9 mA (729 seconds, 28.9%) - 115.0 mA (306 seconds, 27.2%) - 124.5 mA (471.5 seconds, 42.0%) - 146.5 mA (237.5 seconds, 21.1% 3963.67 Hair dryer 5mA (33 seconds, 10.6%) - 641.2mA (6.5 seconds, 2.1%)
- 2.30 A (12 sec, 3.9%) - 3.42 A (151 sec, 48.8%) - 5.34 A (107.5 sec, 34.6%) 1510.7

Referring to Table 1, there are some important facts as follows.

First, the minimum value of the representative current level of an electronic device is slightly different for each electronic device, but is grouped. Fan, hair dryer, PC and TV have low current consumption level as low as 5mA ~ 50mA, but refrigerator, printer, and microwave oven are as high as 224mA ~ 307mA. Given that the current value is initially at its lowest level when the power switch of any electronic device is pressed, the lowest current consumption level can be good information for an unknown electronic device.

Second, in the situation that there may be some consumption current levels, the average of the signal to noise ratio (A / D) can be obtained to obtain additional information about the household appliances. The refrigerator, PC, and printer have a relatively low signal-to-noise ratio (64 ~ 89) because the consumption current signal is shaken much. On the other hand, household appliances with low power consumption, such as fans and hair dryers, have a very high signal-to-noise ratio (SNR) of 1510 to 3963 because the current consumption waveform is clean. And the other has a high signal-to-noise ratio in the order of the microwave oven 704 and the TV 158.

Third, checking the maximum value of the representative current level of the measured current consumption is a great help in understanding the characteristics of household appliances. The list of household appliances in the order of the maximum value of the representative current level is as follows.

(7.16A)> Hair dryer (5.34A)> Refrigerator (3.85A)> Printer (2.55A)> PC (543mA)> TV (214mA)> Fan (146mA)

Finally, the number of current consumption levels can be determined when a sufficient time has elapsed after measuring the current consumption. From Table 1, it is possible to classify household appliances according to the number of levels (driving modes) as follows.

● 2 types of current levels (ON / OFF): TV, printer, PC, microwave oven

● 3 types Current level: Refrigerator

● 4 types Current level: Fan

● 5 types of current levels: hair dryer

An electronic device most commonly included (up to four) can be an electronic device identified by an algorithm proposed by the present invention while comparing all the four characteristics.

In one embodiment, input 102, calculation 104, determination 106 and identification 108 may be implemented on a computing device that includes one or more processors and a computer-readable medium coupled to the processor have. The computer readable recording medium may be internal or external to the processor, and may be coupled to the processor by any of a variety of well known means. A processor in the computing device may cause each computing device to operate in accordance with the exemplary embodiment described herein. For example, a processor may execute instructions stored on a computer-readable recording medium, and instructions stored on the computer readable medium may cause the computing device to perform operations according to exemplary embodiments described herein For example.

FIG. 8 is a flowchart illustrating a method of identifying a type of an electronic device according to an embodiment of the present invention. The method shown in Fig. 8 can be performed, for example, by the type identifying apparatus 100 of the above-described electronic apparatus. In the illustrated flow chart, the method is described as being divided into a plurality of steps, but at least some of the steps may be performed in reverse order, combined with other steps, performed together, omitted, divided into detailed steps, One or more steps may be added and performed.

In step S802, the input unit 102 receives the consumption current of the electronic device. As described above, the input unit 102 can be connected to, for example, a consumption current meter (not shown) of the smart plug, and can receive the consumption current of the electronic device from the consumption current meter.

In step S804, the calculation unit 104 calculates the average of the consumption current, the standard deviation, the average of the standard deviation, and the signal-to-noise ratio. The calculation unit 104 may calculate an average of current consumption, an average of standard deviation, an average of standard deviation, and a signal-to-noise ratio using Equations 1 to 3 and 6 above. This has been described in detail above, and a detailed description thereof will be omitted here.

In step S806, the determination unit 106 detects a change in the level of the consumption current. As an example, the determination unit 106 can detect the level change of the consumption current by measuring the increase / decrease of the standard deviation calculated previously. As another example, the determination unit 106 may detect the level change of the consumption current from the average of the standard deviation and the standard deviation calculated previously. Specifically, when the standard deviation is equal to or larger than a predetermined value and the standard deviation becomes larger than a predetermined multiple of the average of the standard deviation, the time from the point of time when the standard deviation becomes smaller than the average of the standard deviation It can be judged that the level of the consumption current has changed when it is equal to or larger than the set value.

In step S808, the determination unit 106 determines the representative current level of the consumption current. This will be described in detail with reference to FIG.

In step S810, the identification unit 108 identifies the type of the electronic device using at least one of the representative current level of the consumption current and the signal-to-noise ratio. Specifically, the identification unit 108 compares the minimum value of the representative current level with the minimum value of the representative current level of the previously stored electronic device, or compares the maximum value of the representative current level with the maximum value of the representative current level of the stored electronic device The type of the electronic device can be identified by comparing the number of the representative current levels with the number of the representative current levels of the previously stored electronic devices or by comparing the average of the signal-to-noise ratio and the average of the signal-to-noise ratios of the stored electronic devices.

FIG. 9 is a flowchart for explaining step S808 of FIG. 8 in detail.

In step S902, the determination unit 106 compares the detected consumption current level with the previously-detected representative current level, and calculates the difference therebetween.

If the difference between the detected consumption current level and the detected representative current level is within the set value, the determination unit 106 updates the detected representative current level in step S904. As described above, the determination unit 106 may update the representative current level detected using Equation (4) and Equation (5).

If the difference between the detected consumption current level and the detected representative current level exceeds the set value, the determination unit 106 registers the detected consumption current level at the new representative current level in step S906 .

On the other hand, an embodiment of the present invention may include a program for performing the methods described herein on a computer, and a computer-readable recording medium including the program. The computer-readable recording medium may include a program command, a local data file, a local data structure, or the like, alone or in combination. The media may be those specially designed and constructed for the present invention, or may be those that are commonly used in the field of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, and specifically configured to store and execute program instructions such as ROM, RAM, flash memory, Hardware devices. Examples of such programs may include machine language code such as those produced by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: Type identification device of electronic device
102:
104:
106:
108:

Claims

An input unit for receiving a consumption current of the electronic device;
A calculation unit calculating an average of the consumption currents and calculating a standard deviation and a signal-to-noise ratio of the consumption currents from the average;
A determination unit for detecting a change in the level of the consumption current from the standard deviation and determining a representative current level of the consumption current from the detected level change; And
And an identification unit for identifying the type of the electronic device using at least one of the information of the representative current level and the signal-to-noise ratio.

The method according to claim 1,
Wherein the determination unit detects a change in the level of the consumption current by measuring an increase or decrease in the standard deviation.

The method according to claim 1,
Wherein the calculation unit calculates an average of the standard deviation,
Wherein the determination unit detects a change in the level of the consumption current from an average of the standard deviation and the standard deviation.

The method of claim 3,
When the time from when the standard deviation is equal to or greater than a predetermined value and the standard deviation becomes larger than a predetermined multiple of the average of the standard deviation to the time when the standard deviation becomes smaller than the average of the standard deviation is equal to or greater than a predetermined value, And determines that the level of the consumption current has changed.

The method of claim 3,
Wherein the calculation unit calculates an average of the average, the standard deviation, and the standard deviation using the following Equations (1) to (3).

[Equation 1]

&Quot; (2) "

&Quot; (3) "

(here,

The average,

Is the standard deviation,

The method according to claim 1,
Wherein the determination unit compares the level of the consumption current detected when the level change of the consumption current is detected with the representative current level detected and updates the previously detected representative current level in accordance with the comparison result, And registers the level of consumption current as a new representative current level.

The method of claim 6,
When the difference between the detected consumption current level and the previously detected representative current level is within a set value, the determination unit updates the previously detected representative current level using the following Equation (4) and Equation (5) A type identifying device of an electronic device.

&Quot; (4) "

&Quot; (5) "

The method of claim 6,
Wherein the determination unit registers the level of the consumption current detected as a new representative current level when the difference between the detected consumption current level and the previously detected representative current level exceeds a set value, Identification device.

The method according to claim 1,
The identification unit compares the minimum value of the representative current level with the minimum value of the stored representative current level or compares the maximum value of the representative current level with the maximum value of the stored representative current level, To identify the type of the electronic device by comparing the number of stored representative current levels or by comparing an average of the signal-to-noise ratio and an average of a stored signal-to-noise ratio.

Inputting a consumption current of the electronic device in an input unit;
Calculating an average of the consumption currents in the calculation unit;
Calculating a standard deviation of the consumption current and a signal-to-noise ratio from the average;
Detecting a change in the level of the consumption current from the standard deviation;
Determining the representative current level of the consumption current from the detected level change; And
And identifying the kind of the electronic device by using at least one of the representative current level information and the signal-to-noise ratio in the identifying portion.

The method of claim 10,
Wherein the step of detecting the level change of the consumption current detects the level change of the consumption current by measuring the increase or decrease of the standard deviation.

The method of claim 10,
The calculating unit may further include calculating an average of the standard deviation,
Wherein the step of detecting the level change of the consumption current detects a level change of the consumption current from an average of the standard deviation and the standard deviation.

The method of claim 12,
Wherein the step of detecting the level change of the consumed current includes detecting a change in the level of the consumption current from a time point at which the standard deviation is equal to or greater than a set value and the standard deviation becomes larger than a predetermined multiple of the standard deviation, When the time of the consumed current is equal to or greater than a preset value, determines that the level of the consumed current has changed.

The method of claim 12,
Wherein the average of the mean, the standard deviation, and the standard deviation is calculated using the following Equations (1) to (3).

[Equation 1]

&Quot; (2) "

&Quot; (3) "

(here,

The average,

Is the standard deviation,

The method of claim 10,
Wherein the step of determining the representative current level of the consumption current includes the steps of comparing the level of the consumption current detected when the level change of the consumption current is detected with the representative current level detected, And updating the representative current level or registering the detected consumption current level to a new representative current level.

16. The method of claim 15,
Wherein the step of determining the representative current level of the consumption current comprises the steps of: when the difference between the detected consumption current level and the previously detected representative current level is within a set value, using the following equations (4) and And updates the pre-detected representative current level.

&Quot; (4) "

&Quot; (5) "

16. The method of claim 15,
Wherein the step of determining the representative current level of the consumed current includes the step of comparing the detected current level of the consumed current with a new representative current level when the difference between the detected current level of the consumed current and the previously detected representative current level exceeds a set value, Level of the electronic device.

The method of claim 10,
The step of identifying the type of the electronic device may include comparing the minimum value of the representative current level with a minimum value of the stored representative current level or comparing the maximum value of the representative current level with the maximum value of the stored representative current level, Wherein the type of the electronic device is identified by comparing the number of representative current levels with the number of pre-stored representative current levels or by comparing an average of the signal-to-noise ratio and an average of a stored signal-to-noise ratio.

Combined with hardware
Inputting a consumption current of the electronic device in an input unit;
Calculating an average of the consumption currents in the calculation unit;
Calculating a standard deviation of the consumption current and a signal-to-noise ratio from the average;
Detecting a change in the level of the consumption current from the standard deviation;
Determining the representative current level of the consumption current from the detected level change; And
Identifying in the identifying unit the type of the electronic device using at least one of the representative current level information and the signal-to-noise ratio
The program being stored in the recording medium.