KR101120464B1 - Receptacle for controlling eclectric power supply in response to vibration and method for controlling electric power thereof - Google Patents

Abstract

The receptacle is initiated. The receptacle may include a switching circuit for controlling the supply of a commercial voltage in response to a switching control signal, a voltage supply unit capable of supplying the commercial voltage output from the switching circuit to an electric device, and detecting and detecting an impact applied from the outside. When the impact is greater than or equal to the reference value, the switching circuit is responded to only the sensing signal input while outputting a vibration sensing sensor for outputting a sensing signal in the form of a pulse and the switching control signal for turning off the switching circuit. And a micro control unit for outputting the switching control signal for turning on.

Standby Power, Receptacles, Shock Sensors

Description

Receptacle that senses shock and controls its power supply and how to control its voltage supply {RECEPTACLE FOR CONTROLLING ECLECTRIC POWER SUPPLY IN RESPONSE TO VIBRATION AND METHOD FOR CONTROLLING ELECTRIC POWER THEREOF}

An embodiment according to the concept of the present invention relates to a voltage supply control technique, and more particularly, to a receptacle capable of supplying power again by detecting an impact in a state where power supply is cut off.

Standby power refers to power consumed in a state in which a home appliance is not connected to an external voltage and does not perform its main function or waits for a command for performing the main function from an internal or external source.

The average standby power consumed by home appliances such as audio, TV, VTR, air conditioners, microwave ovens, PCs, monitors, telephones, printers, or boilers is 3.66W and the number of household appliances generating standby power per household is 15.6. There is. Thus, there is a need to reduce standby power both personally and nationally.

In order to reduce the standby power, the user has a special purpose to reduce the standby power, and there is an inconvenience of unplugging the household electrical appliance from the receptacle (or the outlet). Therefore, there is an urgent need for an apparatus and method capable of automatically cutting off unnecessary standby power.

Therefore, the technical problem to be achieved by the present invention is to provide a voltage supply control device and method that can monitor the amount of power consumed in the load and automatically completely cut off the standby power supplied to the load based on the monitoring result.

In addition, the technical problem to be achieved by the present invention is a voltage supply control device and method for supplying the commercial voltage to the load in response to the detection signal output from the vibration sensor while the commercial voltage supplied to the load is cut off To provide.

Another technical problem to be achieved by the present invention is to provide a smart grid system that can use the apparatus and method.

A receptacle according to an embodiment of the present invention includes a switching circuit for controlling the supply of a commercial voltage in response to a switching control signal, a voltage supply unit capable of supplying the commercial voltage output from the switching circuit to an electric device, and an external applied voltage. When a shock is detected and the detected shock is equal to or greater than a reference value, only a vibration detection sensor for outputting a pulse-shaped detection signal and the detection signal input while outputting the switching control signal for turning off the switching circuit. And a micro control unit for outputting the switching control signal for turning on the switching circuit in response.

A receptacle according to another embodiment of the present invention may be used in a switching circuit for controlling a supply of a commercial voltage in response to a switching control signal, a voltage supply unit connected to the switching circuit and to which an electric device can be connected, and used in the voltage supply unit. A power measuring unit for periodically measuring the amount of power to be used and outputting a measurement result, a vibration sensing sensor for detecting a shock applied from the outside and outputting a pulsed detection signal when the detected shock is greater than or equal to the reference value, and microcontroller It includes a unit.

The micro control unit may control the switching control to turn off the switching circuit when the measurement result value output from the power measuring unit is less than a reference power amount for a predetermined time and the count value according to the count result is greater than the reference number of times. A signal is generated and outputs the switching control signal for turning on the switching circuit in response to only the sensing signal input while outputting the switching control signal for turning off the switching circuit.

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The method of controlling a voltage supply of a receptacle may include: switching, by a switching circuit, a commercial voltage supplied to an electric device in response to a first control signal output from a micro control unit; Detecting a shock applied by the vibration sensor from the outside and outputting a detection signal in the form of a pulse when the detected shock is equal to or greater than a reference value; The micro control unit turns on the switching circuit only in response to the sensing signal generated while the switching circuit cuts off the commercial voltage supplied to the electrical device in response to the first control signal. Generating a second control signal for; And supplying the commercial voltage back to the electrical device in response to the second control signal.

According to an embodiment of the present invention, a receptacle and a method for controlling a power supply thereof may be used when a user applies an impact to the voltage supply device, for example, when kicking, while interrupting power consumed by an electrical device connected to the receptacle. The power supply can be restarted alone to increase the user's convenience.

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Specific structural and functional descriptions of embodiments according to the concepts of the present invention disclosed in this specification or application are merely illustrative for the purpose of illustrating embodiments in accordance with the concepts of the present invention, The examples may be embodied in various forms and should not be construed as limited to the embodiments set forth herein or in the application.

Embodiments according to the concept of the present invention may be variously modified and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to a particular disclosed form, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and / or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example, without departing from the scope of rights in accordance with the inventive concept, and the first component may be called a second component and similarly The second component may also be referred to as the first component.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may exist in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined herein. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a system including a voltage supply control device and an electric device according to an embodiment of the present invention.

Referring to FIG. 1, a system 10 according to a concept of the present invention may include a voltage (or power) supply control device 20 connected to a power line 11 and a voltage supplied through the voltage supply control device 20. It includes an electric device 50 that operates based on.

The power line 11 refers to a power line capable of supplying a commercial voltage to a home, a factory, a building, or an office.

The voltage supply control device 20 refers to a device capable of controlling the supply of the operating voltage required by the electric device 50 to the electric device 50. The voltage supply control device 20 may normally supply the operating voltage to the electric device 50, and may automatically cut off the operating voltage supplied to the electric device 50 to cut off standby power. .

For example, the voltage supply control device 20 may be a receptacle, also called a receptacle. The outlet may be implemented as an exposed type or a buried type.

The electric device 50 may refer to a consumer equipment used at home. The home appliance may include any home appliance that is not always used, such as a computer, a monitor, a printer, a scanner, a TV, a VCR, a microwave oven, a washing machine, or the like, and may be used only for a certain time to achieve a certain purpose. In addition, the home appliance may include a refrigerator or an air conditioner.

In addition, the electric device 50 means an electric device or an electronic device that can be used in a factory or a building.

When the system 10 according to the concept of the present invention is implemented as a smart grid system, the system 10 may further include a server 60.

According to an embodiment, the server 60 may transmit or receive data or commands to the voltage supply control device 20 through a wireless communication network.

According to another embodiment of the present disclosure, the server 60 may transmit or receive data or a command to the voltage supply control device 20 through the power line 11.

FIG. 2 shows a block diagram of the voltage supply control device shown in FIG. 1.

1 and 2, the voltage supply control device 10 includes a switching circuit 22, a voltage supply unit 24, a power measurement unit 26, a micro control unit (MCU) 28, And a vibration sensor 30.

The switching circuit 22 may perform an on / off operation in response to a switch control signal SCS output from the MCU 28.

For example, the switching circuit 22 may supply the commercial voltage supplied through the power line 11 to the voltage supply unit 24 in response to the switch control signal SCS having the first level (eg, the high level). In addition, the switching circuit 22 may block the commercial voltage supplied through the power line 11 from being supplied to the voltage supply unit 24 in response to the switch control signal SCS having the second level (eg, the low level). have.

According to an embodiment, the voltage supply controller 10 may further include a rectifier 34 for supplying a DC operating voltage to the switching circuit 22 and the MCU 28. The rectifier 34 is an example of a voltage converter capable of converting a commercial voltage into the DC voltage.

In this case, the switching circuit 22 may be implemented as a relay capable of performing a switching operation in response to the DC operating voltage.

The voltage supply 24 connected to the switching circuit 22 includes a configuration capable of supplying a commercial voltage to the electric device 50, such as a connector or a port. For example, the plug or connector of the electric device 50 may be connected to the voltage supply unit 24. The voltage supply unit 24 may include a plurality of connectors or a plurality of ports so that at least one electric device 50 may be connected. In this case, the voltage supply unit 24 may be a multi-tap.

The power measuring unit 26 may periodically measure the amount of power consumed by the voltage supply unit 24. The measurement period may be set (or changed) by the MCU 28 or may be directly set (or changed) according to data input to the power measuring unit 26.

For example, when the electric device 50 is not connected to the voltage supply part 24 or when the commercial voltage is not supplied to the voltage supply part 24 by the switching circuit 22, it measures by the power measuring part 26. The amount of power consumed may be 0W. However, when the electric device 50 having a constant power consumption, for example 200 W, is connected to the voltage supply 24, the amount of power measured by the power measuring unit 26 may be (200 W ± α). Here, α may be a power consumption, a measurement error, or a tolerance that varies with time.

That is, the power measuring unit 26 is a measuring device, for example, a power measuring device capable of measuring the amount of power consumed by at least one electric device 50, that is, at least one load connected to the voltage supply unit 24. (power meter or watt meter), power consumption meter, or standby power meter. According to an embodiment, the voltage supply control device 20 may further include a display device (not shown) capable of displaying the amount of power consumption measured by the power meter 26.

The power measuring unit 26 measures the amount of power consumption consumed by the voltage supply unit 24 or the electric device 50 connected to the voltage supply unit 24 periodically or independently under the control of the MCU 28, and the result of the measurement. (Eg, information corresponding to the measured power consumption or measured power consumption (eg, data or digital signal)) may be transmitted to the MCU 28 periodically, sequentially, or at a time.

The MCU 28 may compare the reference power amount with the power amount measured by the power measuring unit 30 and output the switch control signal SCS based on the comparison result to the switching circuit 22. According to an embodiment, the power measuring unit 26 and the MCU 40 may be implemented as one hardware or separate hardware.

The reference power amount may be set through an interface connected to the MCU 28. For example, the interface may be an electrical switch capable of setting the reference power amount. The interface may be a user interface for setting the reference power amount.

The MCU 40 may be referred to as a controller, processor, microprocessor, or digital signal processor (DSP) and switches to control the supply of commercial voltages based on the results measured by the power measurement unit 26, for example, the amount of measured power. It may refer to a device capable of performing a function of generating a switch control signal SCS for controlling the operation of the circuit 22.

Since the amount of power consumed by the electric device 50 connected to the voltage supply unit 24 does not always have a constant value and may fluctuate within a measurement tolerance or use tolerance range with time, the power measurement unit 24 The measured power consumption may fluctuate little by little within the measurement tolerance or use tolerance.

Accordingly, the MCU 40 may statistically calculate the results periodically measured by the power measuring unit 24, for example, the measured power amount for a predetermined time (eg, a method of accumulating the measured power consumption, or averaging the measured power consumption). Method) and cut off the commercial voltage supplied to the voltage supply unit 24 based on the calculated power consumption.

That is, the MCU 28 may compare the reference power amount with the power consumption calculated according to a statistical method and output the switch control signal SCS based on the comparison result to the switching circuit 22.

For example, the power measuring unit 26 measures the amount of power consumed by the voltage supply unit 24 under the control of the MCU 40 or at a predetermined time interval (for example, 30 seconds), and the measurement result is measured by the MCU 40. For example, the MCU 28 may calculate the amount of power consumption according to a method of accumulating or averaging measurement results transmitted from the power measuring unit 26 for a predetermined time (eg, 3 minutes). Accordingly, the MCU 28 may compare the calculated power consumption with the reference power, and generate a switch control signal SCS according to the comparison result.

According to an embodiment, the MCU 28 may set the calculated power consumption to the reference power amount for cutting off standby power. The MCU 28 may store the set reference power amount in the memory 32. Accordingly, at power on, the MCU 28 may generate the switch control signal SCS using the reference power amount stored in the memory 32. The memory 32 may be a nonvolatile memory such as an EEPROM or a flash memory.

The switching circuit 22 may supply or block a commercial voltage to the voltage supply unit 24 in response to the switch control signal SCS. According to an embodiment, the switching circuit 22 may be implemented as a power transistor or a relay having a breakdown voltage higher than a commercial voltage. The switching circuit 22 means a device capable of controlling the supply and interruption of the commercial voltage according to the switch control signal SCS despite its name.

According to an embodiment, the voltage supply control device 20 may further include an overcurrent breaker 36 connected between the switching circuit 22 and the voltage supply unit 24. The overcurrent breaker 36 measures the amount of current flowing between the switching circuit 22 and the voltage supply part 24, and protects the voltage supply control device 20 when the amount of the measured current is greater than the reference current amount. In order to achieve this, the connection between the switching circuit 22 and the voltage supply unit 24 may be interrupted. The overcurrent breaker 36 may reconnect the switching circuit 22 and the voltage supply 24 by manual reset or automatic reset.

According to another embodiment, the MCU 28 counts the number of times the power consumption measured by the power measuring unit 26 is lower than the reference power amount, and records the count result in the internal memory or the memory device 32, and the internal The number of times written in the memory or the memory device 32 and the reference number may be compared to generate a switch control signal SCS that may control the operation of the switching circuit 22 according to the comparison result.

That is, when the number of times counted for a predetermined time is greater than the reference number, the MCU 28 determines that unnecessary standby power is being consumed through the voltage supply unit 24 and turns off the switching circuit 22. It is possible to generate a switch control signal (SCS) having a.

For example, the reference power amount is set to 10W, the reference number is set to 10 times, and for a predetermined time (for example, for 3 minutes), the power consumption periodically measured by the power measurement unit 26 by the MCU 28 is less than 10W. In the case of receiving the measurement results indicating that it is 11 times, the MCU 28 indicates that the electric device 50 connected to the voltage supply unit 24 is not currently used and the electric device 50 uses unnecessary standby power. A switch control signal SCS can be sent to the switching circuit 22 to determine and turn off the switching circuit 22. In this case, the MCU 28 may reset the value of counting the number of times the measurement power consumption is lower than the reference power amount after a predetermined time.

The vibration sensor 30 detects a shock or a shock applied from the outside to the voltage supply control device 20 and outputs a detection signal DET according to the detection result.

FIG. 3 is a timing diagram for describing an operation of the vibration sensor and the micro control unit illustrated in FIG. 2. The operation of the voltage supply control device 20 will be described with reference to FIGS. 1 to 3 as follows.

For example, the vibration sensor 30 detects a shock or an impact applied from the outside at each of the time points T1, T2, and T3 and generates a detection signal DET having a pulse shape according to the winding result. For example, the vibration sensor 30 outputs a pulse-shaped detection signal DET when the detected shock is greater than or equal to the reference value, and outputs a detection signal DET having a second level when the shock is smaller than the reference value. .

When the level of the switch control signal SCS is the first level, the MCU 30 outputs the switch control signal SCS having the first level to the switching circuit 22 regardless of the level of the detection signal DET. .

However, when the level of the switch control signal SCS is the second level, the MCU 28 has a switch control signal having a first level for turning on the switch circuit 22 in response to the sensing signal DET in the form of a pulse. Output (SCS). Therefore, the switch circuit 22 supplies the commercial voltage supplied through the power line 11 to the voltage supply unit 24 in response to the switch control signal SCS having the first level. Therefore, the commercial voltage is supplied to the electric device 50 through the voltage supply 24.

More specifically, even when the detection signal DET having a pulse shape is output from the vibration detection sensor 30 at the time T1 at which the switch control signal SCS having the first level is supplied to the switch circuit 22, the MCU 28 ) Continuously supplies the switch control signal SCS having the first level to the switch circuit 22.

However, at the time T2, the MCU 28 outputs a switch control signal SCS having a second level (eg, a low level) to the switch circuit 22 to block a commercial voltage supplied to the voltage supply 24. do. Thus, standby power consumed by the electric device 50 connected to the voltage supply unit 24 can be cut off.

If the detection signal DET having a pulse shape occurs while the commercial voltage supplied to the voltage supply part 24 is cut off, that is, at the time T3, the MCU 28 responds to the detection signal DET having a pulse shape. The switch control signal SCS having the first level is output to the switch circuit 22.

That is, when the detection signal DET having a pulse shape is generated while the voltage supply control device 20 cuts off power consumed by the electric device 50 connected to the voltage supply unit 24, the MCU 28 Recognizes the detection signal DET as a switch-on signal to generate a switch control signal SCS having a first level. For example, when the user kicks the voltage supply device 20 while the voltage supply control device 20 cuts off power consumed by the electric device 50 connected to the voltage supply unit 24, the vibration detection sensor 30 detects a shock or shock generated by the user's action and outputs a pulse-shaped detection signal DET to the MCU 28.

That is, while the voltage supply control device 20 cuts off the power supplied to the voltage supply unit 24 based on the amount of power measured by the power measurement unit 26 or based on the switch-off operation of the user, vibration sensing is performed. When the detection signal DET in the form of a pulse is output from the sensor 30, the voltage supply control device 20 may supply a commercial voltage supplied through the power line 11 to the electric device 50.

According to an embodiment, the voltage supply control device 20 may further include a wireless interface 38 capable of transmitting information on the amount of power consumption measured by the server 60 under the control of the MCU 28. The MCU 28 may transmit the switch control signal SCS to the switching circuit 22 based on the command output from the server 60 through the air interface 38.

In addition, the MCU 28 may store information on the reference power output from the server 60 through the air interface 38 in the memory 32.

When the system 10 according to the concept of the present invention is a smart grid system such as a power consumption wireless detection system, the MCU 28 may be configured to respond to a power detection command output from the server 60 via the wireless interface 38. The switch control signal SCS having one level can be transmitted to the switching circuit 22.

FIG. 4 is a flowchart for explaining an operation of the voltage supply control device shown in FIG. 1. Referring to Figures 1 to 4 will be described a method for cutting off the commercial voltage supplied to the electric device 50.

First, it is assumed that a commercial voltage is supplied to the electric device 50 through the voltage supply unit 24.

The power measuring unit 26 periodically measures the power consumed by the voltage supply unit 24 and periodically transmits the measurement result to the MCU 28 (S10).

The MCU 28 counts the number of times the amount of power measured by the power measuring unit 26 is lower than the reference amount of power (S20).

For a certain period of time, MCU 28 compares the counted count with the reference count value (S30).

During the predetermined time, when the counted number is greater than the reference count value, for example, when the electric device 50 connected to the voltage supply unit 24 is not currently used but consumes unnecessary standby power, the MCU ( 28 transmits the switch control signal SCS having the second level to the switch circuit 22, so that the switch circuit 22 supplies the voltage supply section 24 with the commercial voltage supplied through the power line 11. Block (S31).

However, during the predetermined time, when the counted number is smaller than the reference count value, for example, when the electric device 50 connected to the voltage supply unit 24 is currently in use, the MCU 28 returns to the first level. Since the switch control signal SCS is transmitted to the switch circuit 22, the switch circuit 22 transmits the commercial voltage supplied through the power line 11 to the voltage supply part 24 (S33). As described above, the commercial voltage may be transmitted to the voltage supply unit 24 through the overcurrent breaker 36 (S33). After the predetermined time has passed, the MCU 28 may reset the counted number to an initial value, for example, zero.

5 is a flowchart for describing an operation of supplying a voltage according to a shock detected in a state in which a voltage supply is cut according to an exemplary embodiment of the present invention.

1 to 5, while the commercial voltage supplied to the voltage supply unit 24 through the switch circuit 22 is blocked, the vibration sensing sensor 30 is applied to the voltage supply control device 20. Or sense a shock (S110).

When the impact applied to the voltage supply control device 20 or the impact DV is greater than the preset reference value RV, the vibration sensor 30 generates a detection signal DET in the form of a pulse. Accordingly, the MCU 28 generates the switch control signal SCS having the first level in response to the pulse-shaped detection signal DET. Therefore, the switch circuit 22 transmits the commercial voltage supplied through the power line 11 to the voltage supply unit 24 in response to the switch control signal SCS having the first level (S130).

6 is a flowchart illustrating a method of adjusting a load power measurement time interval according to an embodiment of the present invention.

1 to 6, while the commercial voltage is being supplied to the electric device 50 through the voltage supply unit 24, the power measuring unit 26 reduces the amount of load power consumed through the voltage supply unit 24. The measurement is performed every 1 hour interval (for example, 30 seconds), and the measurement result (for example, the measured load power amount) is transmitted to the MCU 28 (S210).

The MCU 28 compares the measured load power amount with the reference power amount (S220).

When the measured load power amount is lower than the reference power amount for the first time, the MCU 28 adjusts a control signal for adjusting the first time interval (for example, 30 seconds) to the second time interval (for example, 3 seconds). 26). Therefore, the power measuring unit 26 adjusts the load power measurement time interval from the first time interval to the second time interval in response to the control signal (S230).

Accordingly, the power measuring unit 26 measures the amount of load power consumed through the voltage supply unit 24 every second time interval (for example, 3 seconds), and the measurement result (for example, the measured load power amount) of the MCU. Transfer to 28 (S240).

For a predetermined time, the MCU 28 counts the measurement result measured every second time interval (eg, 3 seconds), and compares the counted value TTG and the reference value Tref (S250). After the predetermined time has elapsed, the value TGC counted by the MCU 28 may be reset to an initial value, for example, zero. According to an embodiment, the counted value TGC may include the number of times that the measured load power amount is lowered first than the reference power amount, and may not include the number of times that the value is initially lowered.

When the counted value TGC is larger than the reference value Tref, that is, when the electric device 50 connected to the voltage supply unit 24 is consuming unnecessary standby power, the MCU 28 returns to zero. Since the switch control signal SCS having the two levels is transmitted to the switch circuit 22, the commercial voltage supplied to the voltage supply section 24 is cut off. Therefore, the standby power consumed from the electric device 50 connected to the voltage supply section 24 can be completely cut off.

A method of supplying the commercial voltage back to the electric device 50 according to the shock sensed by the vibration sensor 30 in the state where the supply of the commercial voltage to the electric device 50 is completely blocked is shown in FIG. 5. .

The switch control signal for cutting off the commercial voltage supplied to the electric device 50 may be referred to as a first control signal. The switch control signal generated in response to the generated pulsed detection signal may be referred to as a second control signal.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The detailed description of each drawing is provided in order to provide a thorough understanding of the drawings cited in the detailed description of the invention.

1 is a block diagram of a system including a voltage supply control device and an electric device according to an embodiment of the present invention.

FIG. 2 shows a block diagram of the voltage supply control device shown in FIG. 1.

FIG. 3 is a timing diagram for describing an operation of the vibration sensor and the micro control unit illustrated in FIG. 2.

FIG. 4 is a flowchart for explaining an operation of the voltage supply control device shown in FIG. 1.

5 is a flowchart for describing an operation of supplying a voltage according to a shock detected in a state in which a voltage supply is cut according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating a method of adjusting a load power measurement time interval according to an embodiment of the present invention.

Claims (4)

A switching circuit for controlling the supply of the commercial voltage in response to the switching control signal; A voltage supply unit capable of supplying the commercial voltage output from the switching circuit to an electric device; A vibration sensor for detecting a shock applied from the outside and outputting a pulse-shaped detection signal when the detected shock is equal to or greater than a reference value; And And a micro control unit for outputting the switching control signal for turning on the switching circuit in response to only the sensing signal input while outputting the switching control signal for turning off the switching circuit. A switching circuit for controlling the supply of the commercial voltage in response to the switching control signal; A voltage supply connected to the switching circuit and to which an electric device can be connected; A power measuring unit for periodically measuring an amount of power used by the voltage supply unit and outputting a measurement result value; A vibration sensor for detecting a shock applied from the outside and outputting a pulse-shaped detection signal when the detected shock is equal to or greater than a reference value; And Generating a switching control signal for turning off the switching circuit when the measured result value output from the power measuring unit for a predetermined time counts the number of times lower than the reference power amount and the count value according to the count result is larger than the reference number, A receptacle including a micro control unit for outputting said switching control signal for turning on said switching circuit in response to only said sensing signal input while outputting said switching control signal for turning off a switching circuit; . delete The switching circuit interrupting the commercial voltage supplied to the electric device in response to the first control signal output from the micro control unit; Detecting a shock applied by the vibration sensor from the outside and outputting a detection signal in the form of a pulse when the detected shock is equal to or greater than a reference value; And The micro control unit turns on the switching circuit only in response to the sensing signal generated while the switching circuit cuts off the commercial voltage supplied to the electrical device in response to the first control signal. Generating a second control signal for; And And the switching circuit resupplying the commercial voltage to the electrical device in response to the second control signal.

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