KR101993320B1 - Outlets capable of blocking standby power - Google Patents

Abstract

An embodiment of the present invention relates to a standby power cut-off outlet. The purpose of the present invention is to provide a standby power cut-off outlet for automatically switching to a standby power cut-off state when a home appliance is not used, and automatically switching to a power supply state when the home appliance is used in a power button manner and/or in an infrared remote control manner. The standby power cut-off outlet comprises: a power input unit; a power output unit; a relay unit connected between the power input unit and the power output unit; a current sensor sensing current through the output unit; a timer; a control unit outputting a standby power cut-off signal when the current value sensed by the current sensor is smaller than a reference value during a reference time measured by the timer; and a relay driving unit operating the relay unit according to the standby power cut-off signal of the control unit so as to electrically disconnect the power input unit and the power output unit.

Description

{Outlets capable of blocking standby power}

An embodiment of the present invention relates to a standby power disconnecting receptacle.

Standby power refers to electricity consumed when a plug is plugged in even when the appliance is not in use. This standby power has a problem of causing a lot of energy waste in a modern life using a plurality of household appliances.

In order to reduce the use of such standby power, a power saving outlet has been proposed in which the power can be cut off when the household appliance is in a standby state.

Such a conventional power saving outlet can cut off the power supply based on the amount of power consumption when the appliance is in a standby state. However, in order to use the appliance, the user must operate the power saving socket or use a dedicated remote control for the power saving socket There is a problem that it is inconvenient to use.

The above-described information disclosed in the background of the present invention is only for improving the understanding of the background of the present invention, and thus may include information not constituting the prior art.

A problem to be solved according to an embodiment of the present invention is to automatically switch to a standby power cutoff state when a household appliance is not used and to automatically switch to a power supply state when the household appliance is used by a power button method and / Standby power disconnecting receptacle.

A standby power cut-off receptacle according to an embodiment of the present invention includes a power input unit; A power output unit; A relay unit connected between the power input unit and the power output unit; A current sensor for sensing a current through the output; timer; A controller for outputting a standby power cut-off signal when a current value sensed by the current sensor is smaller than a reference value during a reference time measured by the timer; And a relay driving unit for operating the relay unit according to a standby power cutoff signal of the control unit to electrically disconnect the power input unit and the power output unit.

Further comprising an impedance sensor connected to the relay unit and sensing an impedance change due to power-on and power-off of a household appliance connected to the output unit, wherein when the impedance sensed by the impedance sensor is greater than a reference value, And may transmit a blocking release signal to the relay driver.

The infrared sensor may further include an infrared sensor that senses an infrared signal in response to power-on and power-off of the household appliance by the infrared remote controller, and the control unit may stop the standby power when the infrared signal sensed by the infrared sensor corresponds to the power- And transmits a release signal to the relay driver.

The reaction time of the infrared sensor may be faster than or equal to the reaction time of the infrared receiver installed in the household appliance.

A current transformer for sensing a current of the output unit and outputting the current signal as an electrical signal; An operational amplifier for amplifying and outputting a signal input from the current transformer; And a resistor connected between an input terminal and an output terminal of the operational amplifier.

Wherein the impedance sensor comprises: a capacitor for removing electrical noise included in a signal output from the relay unit; And an operational amplifier connected to the relay unit and outputting an electrical signal corresponding to the power-on state of the appliance or the power-off state of the appliance according to an impedance value of the output unit.

And a power return button provided on the relay unit for manually performing the standby power cutoff canceling operation.

The relay unit includes a first contact and a second contact respectively connected to the power input unit. A third contact and a fourth contact respectively connected to the power output unit; A fifth contact and a sixth contact respectively connected to the third and fourth contacts; A seventh contact and an eighth contact respectively connected to the impedance sensor; A relay coil disposed on one side of the first to eighth contacts; A first relay connection plate connected to any one of the first and third contacts and the fifth and seventh contacts; And a second relay connection plate connected to any one of the second and sixth contacts and the fourth and eighth contacts. When the control unit outputs a standby power cutoff signal to the relay driving unit, The first relay connection plate may be connected to the fifth and seventh contacts, the second relay connection plate may be connected to the fourth and eighth contacts, and the control unit may output a standby power cutoff signal to the relay driver The relay coil may be de-energized to connect the first relay connection plate to the first and third contacts and the second relay connection plate to the second and sixth contacts.

The embodiment of the present invention provides a standby power cut-off receptacle that is automatically switched to the standby power cutoff state when the household appliance is not used and is automatically switched to the power supply state when the household appliance is used by the power button method and / do.

For example, when the household appliance is judged to be in an unused state by using the current sensor, the relay is operated to switch to the standby power cutoff state. When the power of the household appliance is operated by button operation, the impedance is checked by the impedance sensor, Or to switch the power supply state by checking the infrared ray with the infrared ray sensor when operating the power supply of household appliances by the infrared remote control method.

FIGS. 1A and 1B are schematic diagrams showing the configuration and use of a standby power cut-off receptacle according to an embodiment of the present invention.
2 is a block diagram illustrating a configuration of a standby power cut-off receptacle according to an embodiment of the present invention.
FIGS. 3A and 3B are exemplary circuit diagrams illustrating a current sensor and an impedance sensor among the standby power cut-off sockets according to the embodiment of the present invention.
4A and 4B are graphs of a relay operating voltage and an electrical appliance impedance in a standby power cut-off receptacle according to an embodiment of the present invention.

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

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more faithful and complete, and will fully convey the scope of the invention to those skilled in the art.

In the following drawings, thickness and size of each layer are exaggerated for convenience and clarity of description, and the same reference numerals denote the same elements in the drawings. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. In the present specification, the term " connected "means not only the case where the A member and the B member are directly connected but also the case where the C member is interposed between the A member and the B member and the A member and the B member are indirectly connected do.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise, " and / or "comprising, " when used in this specification, are intended to be interchangeable with the said forms, numbers, steps, operations, elements, elements and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

It is to be understood that the terms related to space such as "beneath," "below," "lower," "above, But may be utilized for an easy understanding of other elements or features. Terms related to such a space are for easy understanding of the present invention depending on various process states or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature of the drawing is inverted, the element or feature described as "lower" or "below" will be "upper" or "above." Thus, "below" is a concept covering "upper" or "lower ".

In addition, the controller (controller) and / or other associated equipment or components in accordance with the present invention may be implemented using any suitable hardware, firmware (e.g., custom semiconductor), software, or any appropriate combination of software, . For example, the various components of a controller (controller) and / or other associated equipment or components in accordance with the present invention may be formed on one integrated circuit chip or on a separate integrated circuit chip. In addition, the various components of the controller (controller) may be implemented on a flexible printed circuit film and formed on the same substrate as the tape carrier package, printed circuit board, or controller (controller). In addition, the various components of the controller (controller) may be a process or thread executing on one or more processors in one or more computing devices, which executes computer program instructions to perform various functions, And interact with other components. The computer program instructions are stored in a memory that can be executed on a computing device using standard memory devices, such as, for example, random access memory. The computer program instructions may also be stored in other non-transitory computer readable media, such as, for example, CD-ROMs, flash drives, and the like. Further, those skilled in the art will appreciate that the functions of the various computing devices may be combined with one another, integrated into one computing device, or the functionality of a particular computing device may be implemented within one or more other computing devices Lt; / RTI > can be dispersed in the < / RTI >

FIGS. 1A and 1B are schematic diagrams showing the configuration and use of a standby power cut-off receptacle 100 according to an embodiment of the present invention.

1A, a standby power cut-off receptacle 100 according to an embodiment of the present invention can be coupled to a general outlet 101. In the standby power cut-off receptacle 100, And can be electrically connected through the plug 103. The standby power cut-off receptacle 100 basically includes a power input unit 110 and a power output unit 115. In addition, the standby power cut-off receptacle 100 may include a current sensor (including CT), a display portion 155, and a power return button 170. In addition, the standby power cut-off receptacle 100 may further include an infrared sensor 150.

In this way, standby power that is not more than the reference current value (for example, 0.1 A) is detected by the current sensor 125 and is set in advance in the timer 130 (see FIG. 2) When the user continues to use the various household appliances 102 through the automatic shutdown function of the standby power cut-off receptacle 100 when the current time is less than the reference value until the reference time (for example, 10 minutes) So that the standby power can be cut off. Of course, when the device is used again after the reference time, the power is turned back on by a signal (fine impedance increase) coming in through the standby power cut-off receptacle 100 by movement of a button or switch pressed for re- When the household appliances 102 operate with the remote control, the infrared signal transmitted from the remote control is detected by the standby power cut-off receptacle 100 and the power is restored, so that the user can eliminate the necessity of manually turning on standby power to eliminate the standby power.

As shown in FIG. 1B, the response time of the infrared signal by the infrared remote controller may be faster or the same as the stand-by power cut-off receptacle 100 in comparison with the household appliance 102. In general, all infrared remote controllers have their own wavelength band, but their operating band is fixed, so that the infrared sensor 150 of the standby power disconnecting receptacle 100 can detect all kinds of remote control transmitting wavelengths, Sensitive power receptacle 100 is always powered earlier than the appliance 102 by making the appliance 100 susceptible to quicker response than the appliance 102 so that the outlet 100 is turned off before using the appliance 102, The standby power cut-off receptacle 100 and the household appliances 102 can be used immediately when the infrared transmitting button is pressed by the remote controller.

Therefore, the household electric appliances 102 that turn on / off the power by the remote controller are provided with the infrared sensor 150 and the outlet 100 that turns on / off the power even with a fine impedance value is used. The household appliance 102 that turns on the power by the mechanical button or the electronic contact without turning on the power supply 100 may be installed with the infrared sensor 150 and the power supply turned on / off at the fine impedance value. As a result, it is possible to maximize convenience for the user by reducing or eliminating unnecessary malfunctions by using two kinds of standby power cut-off receptacles 100 according to the type of the home appliance 102.

2 is a block diagram showing a configuration of a standby power cut-off receptacle 100 according to an embodiment of the present invention.

2, the standby power disconnecting receptacle 100 according to the embodiment of the present invention includes a power input unit 110, a power output unit 115, a relay unit 120, a current sensor 125, A timer 130, a control unit 135, and a relay driver 140. [ In addition, the standby power cut-off receptacle 100 may further include an impedance sensor 145. Furthermore, the standby power cut-off receptacle 100 may further include an infrared sensor 150. Further, the standby power cut-off receptacle 100 may further include a display unit 155 and / or a warning unit 160. In addition, the standby power cut-off receptacle 100 may further include a power supply unit 165.

The power input unit 110 is coupled to the general outlet 101 and can receive AC power, for example.

When the power output unit 115 is electrically connected to the power input unit 110, the power can be supplied to the external home appliance 102. When the power output unit 115 is disconnected from the power input unit 110, the standby power can be cut off. Here, the household electrical appliances 102 may be electrically connected to the power output unit 115 through a common plug 103, for example. Here, the household appliance 102 may include a power switch SW that operates manually or by a remote controller, and a load RL.

The relay unit 120 is connected between the power input unit 110 and the power output unit 115 to electrically connect or disconnect the power input unit 110 and the power output unit 115. [ The relay unit 120 includes a first contact 1 and a second contact 2 connected to the power input unit 110 and a third contact 3 and a fourth contact 3 connected to the power output unit 115, Fourth contacts 5 and sixth contacts 6 connected to the third and fourth contacts 3 and 4 respectively and seventh contacts 7 and 8 connected to the impedance sensor 145 respectively, The relay coil Ry located at one side of the first to eighth contacts 1-8, the first and third contacts 1 and 3 and the fifth and seventh contacts 5 and 7 A second relay connection plate 121 connected to one of the second and sixth contacts 2 and 6 and the fourth and eighth contacts 4 and 8, .

The first and second relay connection plates 121 and 122 may be connected to a starting connection plate 123. When the relay coil Ry is energized, the first and second relay connection plates 121 and 122 may be moved toward the relay coil Ry, The relay coil Ry can be moved away from the relay coil by the restoring force of a spring (not shown). Of course, the first and second relay connection plates 121 and 122 can move together with the start connection plate 123. In addition, the power return button 170 is connected to the first relay connection plate 121, the second relay connection plate 122, and the start connection plate 123, Can move. That is, the standby power cutoff or unblocking may be manually performed by the power return button 170. [

The current sensor 125 is installed in the power output unit 115 and can sense a current supplied to the household appliance 102 through the power output unit 115 and transmit the sensed current to the controller 135. To this end, the current sensor 125 may include a current transformer CT provided at the power output unit 115.

The timer 130 may check the current time or elapsed time and send it to the controller 135. For example, the timer 130 may be a clock provided to the control unit 135 itself.

The control unit 135 may transmit a standby power cutoff signal when the current value sensed by the current sensor 125 is smaller than the reference value for the reference time measured by the timer 130. [ Here, the reference time by the timer 130 can be adjusted by the user. For example, the reference time by the timer 130 may be set between 1 minute and 10 minutes.

The relay driving unit 140 may operate the relay unit 120 according to the standby power cutoff signal of the control unit 135 so that the power input unit 110 and the power output unit 115 are electrically separated from each other.

The impedance sensor 145 is connected to the relay unit 120 and senses an impedance change due to power-on and power-off of the household appliance 102 connected to the output unit and transmits the sensing result to the controller 135. If the impedance sensed by the impedance sensor 145 is smaller than the reference value, the control unit 135 outputs a standby power cutoff signal to the relay driving unit 140. If the impedance sensed by the impedance sensor 145 is greater than the reference value, It is possible to output the unblocking signal to the relay driver 140. Here, the impedance sensor 145 may be connected to the seventh contact 7 and the eighth contact 8 of the relay unit 120, respectively.

The infrared sensor 150 senses an infrared signal according to the power-on and power-off of the household appliance 102 by the infrared remote controller, and transmits the sensed infrared signal to the controller 135. If the infrared signal sensed by the infrared sensor 150 corresponds to a power-off signal, the control unit 135 outputs a standby power cut-off signal to the relay driving unit 140. If the infrared signal corresponds to a power-on signal, It is possible to output the unblocking signal to the relay driver 140.

Here, when the infrared signal is a power-on signal, the reaction time of the infrared sensor 150 may be faster than or equal to the reaction time of the infrared receiver installed in the household appliance 102. Therefore, power can be stably supplied when the household appliances 102 are turned on. If the infrared signal is the power-off signal, the reaction time of the infrared sensor 150 may be slower than or equal to the response time of the infrared receiver installed in the household appliance 102. Therefore, power failure can be prevented when the household appliances 102 are turned off.

The display unit 155 and / or the warning unit 160 may visually and / or audibly display the normal or abnormal operation state of the standby power shut-off receptacle 100 under the control of the controller 135.

The power supply unit 165 may be electrically connected to the power input unit 110 and may supply power to the receptacle 100 including the relay unit 120 and the control unit 135. [ The power supply unit 165 may convert AC power input through the power input unit 110 into DC power and supply the AC power to the relay unit 120 and the control unit 135 using a constant voltage diode, DC power required for driving can be supplied. Here, the power consumed by the power supply unit 165 is less than about 0.1 W, which may be a considerably smaller value than about 3-5 W, which is the normal standby power.

In this way, when the current value sensed through the current sensor 125 is smaller than the reference value and the state is maintained longer than the reference time obtained from the timer 130, the controller 135 outputs a standby power cutoff signal to the relay driver 140, . The first relay connection plate 121 is connected to the fifth and seventh contacts 5 and 7 by applying power to the relay coil Ry of the relay unit 120 by the power supply unit 165, The relay connection plate 122 is connected to the fourth and eighth contacts 4 and 8 to thereby shut off the power output through the power output unit 115. [ That is, when the first relay connection plate 121 of the relay unit 120 is disconnected from the first and third contacts 1 and 3 and the second relay connection plate 122 is disconnected from the second and sixth contacts 2 and 6 So that the power input part 110 and the power output part 115 can be electrically separated from each other. In other words, standby power can be shut off.

On the other hand, when the user turns on the button (switch) of the household appliance 102, the internal impedance of the appliance 102 changes. This change in impedance is caused by the power output section 115, the fifth and seventh contacts 5 and 7 of the relay section 120 (i.e., the first relay connection plate 121), and the fourth and eighth contacts 4 and 8 (I.e., the second relay connection plate 122) to the impedance sensor 145. Then, the control unit 135 outputs the standby power cut-off cancel signal to the relay driving unit 140. [ The power supplied to the relay coil Ry of the relay unit 120 is released and the first relay connection plate 121 is connected to the first and third contacts 1 and 3 due to the restoring force of the spring, The relay connection plate 122 is connected to the second and sixth contacts 2 and 6 so that the power input unit 110 and the power output unit 115 can be electrically connected. In other words, the standby power cut-off state can be released. That is, power can be normally supplied to the household appliances 102.

In another example, when the user inputs a power turn-on signal with the infrared remote controller to apply power to the household appliance 102, the infrared sensor 150 may receive the signal and transmit the signal to the controller 135. The control unit 135 outputs a standby power cut-off cancel signal to the relay driving unit 140 when it is determined that the infrared signal sensed by the infrared sensor 150 corresponds to the power turn-on signal. Accordingly, the relay unit 120 operates in the same manner as described above, so that the standby power cut-off state is released. At this time, the operation of the relay unit 120 is set faster than the operation time of the household appliance 102, so that the household appliance 102 can be turned on after the standby power cut-off state is released.

3A and 3B are exemplary circuit diagrams showing a current sensor 125 and an impedance sensor 145 among the standby power shutdown sockets 100 according to the embodiment of the present invention.

3A, the current sensor 125 among the stand-by power cut-off receptacle 100 according to the embodiment of the present invention includes a current transformer CT connected to the power source output unit 115, a current transformer CT connected to the power source output unit 115, A resistor R17 connected between the other end of the resistor R15 and the output terminal of the operational amplifier OP1, an operational amplifier OP1 connected to the other ends of the resistors R15 and R16, And a resistor R18 connected between the other end of the resistor R16 and the ground. Here, the power supply Vcc of the power supply unit 165 may be applied to the operational amplifier OP1.

3B, the impedance sensor 145 of the standby power cut-off receptacle 100 according to the embodiment of the present invention includes a ground resistance R1 connected to the eighth contact 8, A capacitor C1 and a resistor R4 connected in parallel between a contact point of the resistors R2 and R3 and the ground and a resistor R4 and a power supply Vcc connected in series between the power supply Vcc and the power supply Vcc, A resistor R9 connected at one end to the contacts of the resistors R6 and R7 and a resistor R12 connected at one end to the contacts of the resistors R7 and R8, A resistor R5 connected at one end to the contacts of the resistors R2 and R3, resistors R10 and R11 connected at one end to the other end of the resistor R5, an operational amplifier OP3 connected to the resistors R9 and R10, An operational amplifier OP4 connected to the resistors R11 and R12 and resistors R13 and R14 connected between the output terminal of the operational amplifiers OP3 and OP4 and the power source Vcc.

4A and 4B are graphs of a relay operating voltage and an electrical appliance impedance in a standby power cut-off receptacle 100 according to an embodiment of the present invention. In Fig. 4A, the Y-axis is the voltage value, the X-axis is the impedance value, and the Y-axis is the impedance value in Fig. 4B.

4B, the impedance value of the power output unit 115 (or the household appliance 102) can be largely divided into three levels. One level corresponds to the turn-off state of the household appliances 102 and / The second level is the impedance of the turn-on state of the household appliance 102, and the third level is the impedance of the short-circuited state. Here, the impedance value is high in order of 1 level> 2 levels> 3 levels.

4A, only when the impedance value of the household appliance 102 connected to the power output unit 115 has a value of two levels, the relay unit 120 is connected via the relay driving unit 140 (Power is applied) to be operated.

As described above, the impedance sensor 145 may include two operational amplifiers OP3 and OP4. The operational amplifier OP3 can be supplied with the reference voltage based on the divided voltage of the resistor R6 and the resistors R7 and R8 and the operational amplifier OP4 can be supplied with the divided voltage of the resistors R6 and R7 and the resistor R8 The reference voltage can be applied. In addition, a voltage corresponding to the impedance of the household appliance 102 connected to the power output unit 115 through the resistor R10 may be applied to the operational amplifier OP3, and a resistor R11 may be connected to the operational amplifier OP4. A voltage corresponding to the impedance of the household appliance 102 connected to the power output unit 115 may be applied.

The operational amplifier OP3 can output a high signal to the control unit 135 and the operational amplifier OP4 can output the high signal to the control unit 135. [ And outputs a low signal to the control unit 135. [ In the short-circuited state, the operational amplifier OP3 can output the low signal to the control unit 135, and the operational amplifier OP4 can output the high signal to the control unit 135. [

Finally, when the household appliances 102 are turned on, the operational amplifiers OP3 and OP4 may all output a low signal to the controller 135. [ In this way, the control unit 135 can determine whether the household appliance 102 connected to the power output unit 115 is turned off, in a human contact state, in a short-circuited state, or in a turned-on state of the household appliances 102 And various control operations can be performed based on the determination result.

Here, the output signals of the operational amplifiers OP3 and OP4 can be changed in various ways according to the selection of the resistance value connected to the input terminal, and the present invention is not limited to the types of the output signals described above.

The controller 135 controls the relay driver 140 to be turned on when the household appliance 102 is turned off, in a human contact state, or in a short-circuited state, based on the output signals of the operational amplifiers OP3 and OP4, So that power is not applied to the relay unit 120. Thus, the first and third contacts 1, 3 and the second and sixth contacts 2, 6 are disconnected and the fifth, seventh and fifth contacts 7, The connection state is established. Accordingly, even if a person holds a single wire or two electric wires connected to the power output unit 115, or if a short-circuited household appliance 102 is connected to or short-circuited to the power output unit 115, An electric current does not flow in the battery 115, so that no electric accident occurs.

The control unit 135 controls the power supply to the relay coil Ry through the relay driving unit 140 when the household appliance 102 is turned on based on the output signals of the operational amplifiers OP3 and OP4, . Thus, the first and third contacts 1, 3 and the second and sixth contacts 2 and 6 are in a connected state, the fifth and seventh contacts 5 and 7 and the fourth and eighth contacts 4, And is released. When the first and third contacts 1 and 3 and the second and sixth contacts 2 and 6 of the relay unit 120 are connected to each other, the AC power is supplied to the relay unit 120, the power output unit 115 And the general plug 103 to the household appliance 102 so that the household appliance 102 operates normally.

In addition, the standby power shutdown socket 100 according to the present invention may further include a temperature sensor and / or a leakage current sensor. For example, when the temperature sensor is mounted on the power output unit 115 and the temperature sensed by the temperature sensor is higher than the reference value, the control unit 135 transmits a power off signal to the relay driving unit 140, It is possible to perform the protection operation by turning off the power supply to the relay coil Ry (that is, the AC power output by the power output unit 115 is cut off). When the leakage current sensor is installed in the power output unit 115 and the leakage current sensed by the leakage current sensor is higher than the reference value, the control unit 135 transmits a power shutoff signal to the relay driving unit 140, The relay coil RY of the AC power source 120 is cut off (that is, the AC power output by the power output unit 115 is cut off).

As described above, the present invention is not limited to the above-described embodiment, but can be applied to a standby power cut-off receptacle according to the present invention, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100; Standby power disconnected outlet
101; A general outlet 102; Home Appliances
103; General plug 110; Power input part
115; A power output unit 120; Relay part
1-8; First to eighth contacts Ry; Relay coil
121; A first relay connection plate 122; The second relay connection plate
123; Activation link plate 125; Current sensor
CT: current transformer 130; timer
135; A control unit 140; The relay driver
145; An impedance sensor 150; Infrared sensor
155; A display unit 160; Warning part
165; Power supply 170; Power return button

Claims (8)

A power input unit;
A power output unit;
A relay unit connected between the power input unit and the power output unit;
A current sensor for sensing a current through the output;
timer;
A controller for outputting a standby power cut-off signal when a current value sensed by the current sensor is smaller than a reference value during a reference time measured by the timer;
A relay driving unit for operating the relay unit according to a standby power cut-off signal of the control unit to electrically disconnect the power input unit and the power output unit; And
And an impedance sensor connected to the relay unit and sensing an impedance change due to power-on and power-off of a household appliance connected to the output unit,
Wherein,
When the impedance sensed by the impedance sensor is greater than a reference value, transmits a standby power cutoff cancel signal to the relay driver,
The impedance sensor includes:
A capacitor for removing electrical noise included in a signal output from the relay unit; And
And an operational amplifier connected to the relay unit and outputting an electrical signal corresponding to the power-on state of the appliance or the power-off state of the appliance according to an impedance value of the output unit. delete The method according to claim 1,
Further comprising an infrared sensor for sensing an infrared signal due to power-on and power-off of household appliances by the infrared remote controller,
Wherein the control unit transmits a standby power cut-off signal to the relay driving unit when the infrared signal sensed by the infrared sensor corresponds to a power-on signal. The method of claim 3,
Wherein the response time of the infrared sensor is faster than or equal to the response time of the infrared receiver installed in the household appliance. The method according to claim 1,
The current sensor
A current transformer for sensing a current of the output unit and outputting the current signal as an electrical signal;
An operational amplifier for amplifying and outputting a signal input from the current transformer; And
And a resistor coupled between an input and an output of the operational amplifier. delete The method according to claim 1,
Further comprising a power return button provided on the relay unit for manually performing a standby power cut-off release. The method according to claim 1,
The relay unit
A first contact and a second contact respectively connected to the power input unit;
A third contact and a fourth contact respectively connected to the power output unit;
A fifth contact and a sixth contact respectively connected to the third and fourth contacts;
A seventh contact and an eighth contact respectively connected to the impedance sensor;
A relay coil disposed on one side of the first to eighth contacts;
A first relay connection plate connected to any one of the first and third contacts and the fifth and seventh contacts;
And a second relay connection plate connected to any one of the second and sixth contacts and the fourth and eighth contacts,
When the control unit outputs a standby power cut-off signal to the relay driving unit, power is applied to the relay coil so that the first relay connection plate is connected to the fifth and seventh contacts, and the second relay connection plate is connected to the fourth Contacts,
Wherein when the control unit outputs a standby power interruption cancel signal to the relay driving unit, power to the relay coil is released so that the first relay connection plate is connected to the first and third contacts and the second relay connection plate is connected to the second, 6 A standby power cut-off receptacle connected to the contact.

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