KR101425101B1 - Plug Socket Apparatus for Cutting off Standby Power and Method for Controlling Thereof - Google Patents

Abstract

The present invention relates to an outlet device capable of cutting off standby power supplied to a corresponding electronic appliance by understanding whether the electronic appliance is in a standby mode or not, and is capable of preventing damage to the device and malfunction of the electronic appliance by completely electrically insulating the input and output stages; and a method to control the same. According to the present invention, an outlet device to cut off standby power includes: a relay installed in between a power input stage which inputs commercial power from the outside and a power output stage which supplies the commercial power to an electronic appliance; a relay driving circuit to control switching operation of the relay; a current detection resistor to detect current flows in between the power input stage and the power output stage; a first photocoupler to output a first output voltage corresponding to a first voltage applied to the current detection resistor; a second photocoupler to output a second output voltage corresponding to a second voltage applied to the power output stage; and an outlet controller to detect a zero-cross point of the commercial power by receiving a first amplified voltage corresponding to the first output voltage and a second amplified voltage corresponding to the second output power, calculating the current active power consumed in the electronic appliance with respect to the zero-cross point and controlling the relay driving circuit to make the relay be off by detecting a standby status of the electronic appliance by comparing the current active power with the reference power.

Description

TECHNICAL FIELD [0001] The present invention relates to a standby power cut-off receptacle device,

In particular, the present invention relates to a standby power cut-off receptacle device and a control method thereof. More particularly, the present invention relates to a standby power cut- And more particularly, to a standby power cut-off receptacle device and its control method capable of preventing damage and malfunction.

In general, electronic appliances such as home appliances, office equipment, and industrial appliances use the plugs installed therein by plugging them into an outlet connected to an external power source.

When the plug is connected to the outlet, a certain amount of electric power is consumed in order to perform a basic function (for example, receiving a remote control) inside the electronic product even though the electronic product is not used. The power consumed in the state is called standby power.

Such standby power is recognized as a main cause of waste of electric power, and as energy and environment become important, research and development are actively carried out to minimize standby power.

The simplest conventional technique for blocking standby power is to install a separate on / off switch in the outlet so that the user can manually operate the on / off switch of the outlet to which the unused electronic appliance is connected.

However, because the outlet is often located in a position that is not visible to the human eye such as the back of the furniture, the desk, etc., the user has to go under the desk or put his hand on the back of the furniture in order to manually operate the on / And the like.

Recently, a stand-by power cut-off receptacle device has been introduced that detects the standby state of an electronic product in an outlet and automatically cuts off power supplied to the electronic product to prevent consumption of standby power.

A conventional standby power cut-off receptacle device stores a current used in an electronic product or a standby current when an electronic product is not used when the electronic product is used as a reference value, measures a current flowing in the current electronic product, It is determined whether the electronic product is in the use state or the standby state.

However, such a conventional standby power cut-off receptacle device has the following problems.

First, the current flowing in an electronic product usually changes according to the voltage supplied to the electronic product.

Especially, for small appliances whose power consumption is not significantly different from that of standby power, the current increases when the supply voltage is lowered, and the current decreases when the supply voltage is higher. As a result, It may malfunction depending on the type of electronic product.

Second, hall sensors used for current measurement in a conventional standby power disconnecting receptacle device are expensive parts that depend on the whole amount, and cause the price of the standby power blocking receptacle device to rise.

In addition, the conventional standby power cut-off receptacle device measures power consumption of an electronic product to judge a use state or a standby state. In this case, the apparent power is simply calculated by measuring the voltage and current supplied to the electronic product, It is necessary to measure the active power rather than the apparent power in order to accurately determine whether the electronic product is used or not.

According to an aspect of the present invention, there is provided an electronic apparatus comprising: a plurality of electronic devices, each electronic device including: And to provide a standby power cut-off receptacle device and a control method thereof that can accurately determine a standby state and a use state of an electronic product.

Another object of the present invention is to provide a standby power cut-off receptacle device capable of measuring a current without an expensive hall sensor and a control method thereof.

It is still another object of the present invention to provide a standby power cut-off receptacle device and a method of controlling the same that can prevent damage and malfunction of the device by completely blocking the input end and the output end electrically.

According to an aspect of the present invention, there is provided a standby power cut-off receptacle apparatus including: a relay installed between a power input terminal to which a commercial power is inputted from the outside and a power output terminal to supply the commercial power to an electronic product; A relay driving circuit for controlling a switching operation of the relay; A current detecting resistor for detecting a current flowing between the power input terminal and the power output terminal; A first photocoupler for outputting a first output voltage corresponding to a first voltage applied to the current detection resistor; A second photocoupler for outputting a second output voltage corresponding to a second voltage applied to the power output terminal; A first amplification voltage corresponding to the first output voltage and a second amplification voltage corresponding to the second output voltage are received to detect a zero cross point of the commercial power supply, And a receptacle controller for calculating the current active power consumed and controlling the relay driving circuit to detect whether the electronic product is in a standby state by comparing the current active power with a reference power value so that the relay is turned off .

The present invention also provides a control method of a standby power cut-off receptacle device, comprising: a first step of detecting a detection current corresponding to a current flowing in an electronic product and a detection voltage corresponding to a voltage applied to the electronic product, respectively; A second step of the outlet control device calculating the correction current by correcting the detection current using the current update correction value, and calculating the correction voltage by correcting the detection voltage using the voltage update correction value; A third step of calculating the current active power using the correction current and the correction voltage for a predetermined period from a zero cross point of a power source applied to the electronic product by the outlet control device; And a fourth step of comparing the current active power with a reference power value to detect whether or not the electronic product is in a standby state so that power supply to the electronic product is cut off.

As described above, according to the present invention, the current supplied to the electronic product can be accurately measured without using the expensive Hall sensor, and the accuracy of the current / voltage generated by the individual deviation of the photocoupler before shipment of the product is corrected, Since the current active power consumed in the product is calculated, it is possible to accurately determine the standby state and the usage state of the electronic product, thereby providing a product to the consumer at a low price.

Also, according to the present invention, driving power different from ground is supplied to the input and output terminals of the photocoupler, and the photocoupler completely blocks the input and output terminals electrically, thereby preventing damage and malfunction of the apparatus.

1 is a schematic circuit diagram showing a standby power shutdown receptacle apparatus according to the present invention.
2 is a flowchart illustrating an active power calculation method in the standby power cut-off receptacle apparatus according to the present invention.
3 is a flowchart illustrating a method of calculating a current update correction value according to the present invention.
4 is a circuit diagram showing a state in which a correction load is installed in the standby power shutdown receptacle apparatus according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings and the preferred embodiments thereof.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of the term in order to best explain his or her invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

It should be noted that, in the present specification, the same reference numerals are used to denote the same elements in the drawings, even if they are shown in different drawings.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

1 is a schematic circuit diagram showing a standby power shutdown receptacle apparatus according to the present invention.

1, a standby power cut-off receptacle apparatus according to the present invention includes a relay 120 installed between a power input terminal 111 for inputting a commercial power from the outside and a power output terminal 112 for supplying the commercial power to an electronic product, ); A relay driving circuit 121 for controlling the switching operation of the relay 120; A current detection resistor (R _PTN ) for detecting a current (I _AC ) flowing between the power input terminal (111) and the power output terminal (112); A first differential amplifier 130 for differentially amplifying a first voltage V _CURRENT applied to the current detection resistor R _PTN ; A first DC offset supply unit 131 for supplying a first DC offset to the first voltage V _CURRENT ; A second differential amplifier (140) for differentially amplifying a second voltage (V _VOLTAGE ) corresponding to a voltage (V _AC ) applied to the power output terminal (112); A second DC offset supply part (141) for supplying a second DC offset to the second voltage (V _VOLTAGE ); A first photocoupler 132 provided at an output terminal of the first differential amplifier 130; A second photocoupler 142 provided at an output terminal of the second differential amplifier 140; A first blocking capacitor C100 for removing a DC component from a first output voltage (ISO _CURRENT ) output from the first photocoupler 132; A third differential amplifier 150 for differentially amplifying an AC component of a first output voltage (ISO _CURRENT ) whose DC component is removed by the first blocking capacitor C100; A third DC offset supply 151 for supplying a third DC offset to the first output voltage ISO _CURRENT ; A second blocking capacitor C200 for removing a DC component from a second output voltage ISO _VOLTAGE output from the second photocoupler 142; A fourth differential amplifier (160) for differentially amplifying an AC component of a second output voltage (ISO _VOLTAGE ) whose DC component has been removed by the second blocking capacitor (C200); A fourth DC offset supply unit (161) for supplying a fourth DC offset to the second output voltage (ISO _VOLTAGE ); And a first output voltage (ISO _CURRENT ) and a second output voltage (ISO _VOLTAGE ) from which the DC component is removed from the third differential amplifier (150) and the fourth differential amplifier (160) And a receptacle controller 170 for controlling the relay driving circuit 121. [0033]

Further, the standby power shutdown sockets device according to the present invention further includes an internal power supply 180 for supplying power necessary for driving the respective components.

When the commercial power is supplied through the power input terminal 111, the AC / DC power supply circuit supplies the first driving power Vcc and the second driving power Vdd, which are ground lines separated from each other, And supplies them to the input and output terminals of the photocoupler, respectively.

The current detection resistor R _PTN is provided between the power input terminal 111 and the power output terminal 112 to detect a current I _AC flowing between the power input terminal 111 and the power output terminal 112.

A voltage (V _CURRENT ) corresponding to the current I _AC flowing between the power input terminal 111 and the power output terminal 112 multiplied by the resistance value of the current detection resistor R _{PTN is} connected to both ends of the current detection resistor R _PTN . Is applied.

On the other hand, in order to precisely measure the current, the resistance value must be very small, but the allowable power must be high.

Accordingly, in the present invention, a current detection resistor (R _PTN ) is formed in a copper pattern on a printed circuit board (PCB) to reduce the cost.

At this time, the resistance value of the copper pattern (the width of the pattern W and the length L) fabricated on the printed circuit board of one ounce per square inch is "(L / W) /0.5 mΩ".

The first differential amplifier 130 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first op-amp OP-amp1, The second differential amplifier 140 is composed of an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a second op amp OP2, The differential amplifier 150 includes a 101st resistor R101, a 102nd resistor R102 and a third op amp OP3. The fourth differential amplifier 160 includes a 201st resistor R201, a 202th resistor R201, A resistor R202 and a fourth op-amp (OP-amp4).

The first DC offset supply unit 131 includes a fifth resistor R5 and a sixth resistor R6 that divide the first driving power Vcc and supply a first DC offset to the first voltage V _CURRENT And the second DC offset supply part 141 includes a fifteenth resistor R15 for dividing the first driving power Vcc and supplying a second DC offset to the second voltage V _VOLTAGE , The third DC offset supply unit 151 comprises a 103rd resistor R103 for dividing the second driving power source Vdd and supplying a third DC offset to the first output voltage ISO _CURRENT , And a fourth resistor R104 for supplying a fourth DC offset to the second output voltage ISO _VOLTAGE by dividing the second driving power supply Vdd, And a 204th resistor R204.

The voltage V _AC applied to the power output terminal 112 is divided by the twenty-first resistor R21 and the twenty-second resistor R22 and is connected to the twenty-first resistor R21 and the twenty- And a second voltage (V _VOLTAGE ) divided by the second voltage (V _VOLTAGE ) is input to the second differential amplifier (140).

The first photocoupler 132 is provided between the first differential amplifier 130 and the third differential amplifier 150 to electrically isolate an input terminal and an output terminal of the first differential amplifier 130, And outputs a first output voltage (ISO _CURRENT ) proportional to the first signal to the third differential amplifier 150.

The seventh resistor R7 is connected to the input terminal of the first photocoupler 132 and the 100th resistor R100 is connected to the output terminal thereof in parallel.

The second photocoupler 142 is installed between the second differential amplifier 140 and the fourth differential amplifier 160 to electrically isolate an input terminal and an output terminal of the second differential amplifier 140, And outputs a second output voltage (ISO _VOLTAGE ) proportional to the signal to the fourth differential amplifier 160.

A seventeenth resistor R17 is connected to the input terminal of the second photocoupler 142 and a 200th resistor R200 is connected to the output terminal thereof in parallel.

The outlet control device 170 includes an A / D converter (A / D) for converting an analog input value into a digital value; A memory including a drive program and data; A central processing unit (CPU) for operating the drive program; And an input / output unit (I / O) for outputting a control signal to the relay driving circuit 121.

Meanwhile, the reference power value is stored in the memory, and the reference power value is a reference for determining whether the currently measured effective power consumption of the electronic product is a value of a use state or a value of a standby state.

In addition, the memory stores an update correction value (C _CAL-CURRENT , C _CAL-VOLTAGE ) for correcting the accuracy of the current / voltage generated by the individual deviation of the photocouplers.

The update correction values (C _CAL-CURRENT , C _CAL-VOLTAGE ) for correcting the accuracy of the current / voltage for each photocoupler are calculated in the factory before the standby power cut-off receptacle device according to the present invention is shipped from the factory. A detailed description will be given later.

On the other hand, switching means (not shown) for controlling the relay 120 manually by the user is connected to the input / output unit (I / O).

When the user manually operates the switching means before using the electronic product, the receptacle controller 170 senses the manual operation of the switching means and controls the relay driving circuit 121 to turn on the relay 120 do.

The outlet control device 170 calculates instantaneous power by calculating instantaneous power for a predetermined period after detecting a zero cross point of the commercial power source and calculating an average value.

The process of calculating the present effective power by the outlet controller 170 will be described later.

When the current active power is continuously compared with the reference power value and the current active power is lower than the reference power value (standby state) continuously for a predetermined period, the relay controller 120 controls the relay 120 And controls the relay driving circuit 121 to be turned off.

When the relay 120 is turned off, the power input terminal 111 and the power output terminal 112 are short-circuited and the power supplied to the electronic product is cut off.

Hereinafter, the operation of the standby power cut-off receptacle device according to the present invention will be described.

When the plug of the electronic product is connected to the standby power cut-off receptacle device of the present invention, the outlet control device 170 is connected to the commercial power supply (or the outlet connected to the commercial power supply) Controls the relay driving circuit 121 so that the relay 120 is turned on.

Thus, the power input terminal 111 and the power output terminal 112 are connected to each other, a current detection resistor (R _PTN), the current flowing between the power input terminal 111 and the power output terminal 112. That is, the current flowing in the electronic equipment ( I _AC ) flows while the first voltage (V _CURRENT = I _AC x R _PTN ) is applied.

The first voltage V _CURRENT is amplified by the first differential amplifier 130 and then transmitted to the first photocoupler 132. The first photocoupler 132 is amplified by the first differential amplifier 130, And transmits a first output voltage (ISO _CURRENT ) according to the signal to the third differential amplifier 150.

At this time, the first DC offset is supplied from the first DC offset supply unit 131 to the first voltage V _CURRENT .

The first output voltage (ISO _CURRENT ) transmitted to the third differential amplifier 150 is set such that the larger the signal amplified by the first differential amplifier 130 (i.e., the differential amplified signal of the first voltage V _CURRENT ) And has a smaller value as the signal amplified by the first differential amplifier 130 becomes smaller. That is, the first output voltage ISO _CURRENT has a magnitude proportional to the first voltage V _CURRENT .

The first output voltage (ISO _CURRENT ) output from the first photocoupler 132 is amplified by the third differential amplifier 150 after the DC component is removed by the first blocking capacitor C100, D converter (A / D) of the microcomputer 170.

At this time, the third DC offset is supplied from the third DC offset supply unit 151 to the first output voltage (ISO _CURRENT ) transmitted to the third differential amplifier 150.

Meanwhile, the voltage V _AC supplied to the electronic product through the power output terminal 112 is divided by the twenty-first resistor R21 and the twenty-second resistor R22 to become the second voltage V _VOLTAGE .

The second voltage V _VOLTAGE is amplified by the second differential amplifier 140 and then transferred to the second photocoupler 142. The second photocoupler 142 is amplified by the second differential amplifier 140, And transmits a second output voltage (ISO _VOLTAGE ) according to the signal to the fourth differential amplifier 160.

At this time, the second DC offset is supplied from the second DC offset supply unit 141 to the second voltage V _VOLTAGE .

The second output voltage ISO _VOLTAGE transmitted to the fourth differential amplifier 160 is set to a value that is larger as the signal amplified by the second differential amplifier 140 (i.e., the differential amplified signal of the second voltage V _VOLTAGE ) And has a smaller value as the signal amplified by the second differential amplifier 140 is smaller. That is, the second output voltage ISO _VOLTAGE has a magnitude proportional to the second voltage V _VOLTAGE .

Meanwhile, the second output voltage (ISO _VOLTAGE ) output from the second photocoupler 142 is amplified by the fourth differential amplifier 160 after the DC component is removed by the second blocking capacitor C200, D converter (A / D) of the microcomputer 170.

At this time, the fourth DC offset is supplied from the fourth DC offset supply unit 161 to the second output voltage ISO _VOLTAGE transmitted to the fourth differential amplifier 160.

The outlet control device 170 converts the voltage amplified and input from the third differential amplifier 150 and the voltage amplified by the fourth differential amplifier 160 into a C _CAL-CURRENT , C _CAL-VOLTAGE ), corrects the zero cross-point of the power source by the corrected voltage, and calculates the average value by summing the instantaneous power for the predetermined period to calculate the current effective power.

Also, the outlet control device 170 compares the calculated current active power with the reference power value stored in the memory to determine whether the electronic product is in a standby state. If the standby state is maintained for a preset period, ) Is turned off.

When the relay 120 is turned off, the power input terminal 111 and the power output terminal 112 are short-circuited to cut off the power supplied to the electronic product.

Thereafter, in order to use the electronic product again, the user manually operates the unillustrated switching means. The receptacle controller 170 senses the manual operation of the switching means to turn on the relay 120 to turn on the relay driving circuit 121 ).

As described above, the standby power cut-off receptacle device according to the present invention includes an input terminal for detecting a current flowing in an electronic product and a voltage applied to the electronic product (i.e., a side on which the current detecting resistor, the first differential amplifier and the second differential amplifier are installed) The output terminal provided with the control device 170 is operated in a state of being electrically insulated by the photocoupler, so that damage and malfunction of the device can be prevented.

Also, since the standby power cut-off receptacle device according to the present invention uses an isolation circuit in which the driving power sources Vcc and Vdd are separated from each other, even when measuring the voltage applied to the electronic product and the current flowing in the electronic product, So that damage and malfunction of the device can be prevented.

2 is a flowchart illustrating an active power calculation method in the standby power cut-off receptacle apparatus according to the present invention.

Referring to FIG. 2, the outlet controller 170 sets a sampling number as a constant and initializes a cumulative square power value and a repetition number to 0 in order to calculate active power consumed in an electronic product (S211).

The AC current I _AC flowing into the electronic product is detected by the current detection resistor R _PTN and the voltage V _CURRENT corresponding to the detected AC current I _AC is amplified by the first differential amplifier 130 The voltage across the first photocoupler 132 in the state where the input and output terminals are isolated through the first photocoupler 132 is removed by the first blocking capacitor C100, (A / D) of the outlet control device 170. The A /

Also, the voltage V _AC applied to the electronic product is divided by the twenty-first resistor R21 and the twenty-second resistor R22, amplified by the second differential amplifier 140, and the second photocoupler 142 D converter of the outlet control device 170. The A / D converter 170 of the outlet control device 170 amplifies the DC component by the second blocking capacitor C200, ).

Here, the current corresponding to the current flowing through the power output terminal 112 represents a detection value detected by the current detection resistor R _PTN and transmitted to the outlet control device 170. Hereinafter, .

The voltage corresponding to the voltage applied to the power output terminal 112 is divided by the twenty-first resistor R21 and the twenty-second resistor R22 to express the detection value transmitted to the socket controller 170. Hereinafter, Quot; detection voltage ".

Therefore, the detection current I and the detection voltage V are converted into digital values by the A / D converter A / D and delivered to the outlet control device 170.

When the detection current I and the detection voltage V are transmitted to the outlet control device 170, the outlet control device 170 compares the detection voltage V with the second DC offset, The detection current I and the detection voltage V are read (S213) and the detection current I and the detection voltage V are read through the digital high-pass filter when the second direct current (V) and the second DC offset are equal The noise included in the detection voltage I and the detected voltage V is removed (S214).

After the noise is removed, the DC offset (third DC offset) is removed from the detection current I and the DC offset (fourth DC offset) is removed from the detection voltage V (S215).

Thereafter, the outlet controller 170 multiplies the detection current I and the detection voltage V by the update correction values C _CAL-CURRENT and C _CAL-VOLTAGE stored in the memory, respectively, To obtain a correction current and a correction voltage (S216).

In this case, the update correction values C _CAL-CURRENT and C _CAL-VOLTAGE are values for correcting the accuracy of the current / voltage generated by individual deviations of the photocouplers, and include a current update correction value C _CAL- And a voltage update correction value (C _CAL-VOLTAGE ).

Thus, in step S216, the correction current is obtained by multiplying the detected current I by the current update correction value C _CAL-CURRENT , and the corrected voltage is multiplied by the voltage update correction value C _CAL-VOLTAGE , .

At this time, a method of obtaining each of the update correction values (C _CAL-CURRENT , C _CAL-VOLTAGE ) will be described later.

After obtaining the correction current and the correction voltage, the instantaneous AC current value I _ac and the instantaneous AC voltage value V _ac are extracted from the correction current and the correction voltage, respectively (S217).

The extracted instantaneous alternating current value and instantaneous alternating current voltage value are squared, multiplied, and added to the cumulative square power value Psum (S218), and the repetition number is incremented by one (S219).

Steps S213 to S219 are repeatedly performed until the number of repetitions becomes equal to the number of samples (S220).

Then, the square root of this square root is calculated by dividing the accumulated square power value Psum by the sampling number to obtain the average square power (Pave = Psum / number of sampling) = Pave).

When the current active power in the electronic product is detected in this way, the outlet control device 170 compares the current active power with the reference power value stored in the memory, and if the current active power is smaller than the reference power value If it is determined that the electronic product is in the standby state and the standby state of the electronic product is maintained for a predetermined time or more, that is, if the current active power is continuously less than or equal to the reference power value for the predetermined period, 120 are turned off when the relay driving circuit 121 is turned off.

As a result, power supply to the electronic product is interrupted.

In the present invention, since a pair of photocouplers are used, in order to correct the current / voltage accuracy due to the individual deviation of the photocoupler, the update correction values (C _CAL-CURRENT , C _CAL-VOLTAGE ) .

The update correction values C _CAL-CURRENT and C _CAL-VOLTAGE are calculated in the factory and stored in the memory before being shipped from the factory.

FIG. 3 is a flowchart illustrating a method of calculating a current update correction value according to an embodiment of the present invention. FIG. 4 is a circuit diagram illustrating a state in which a correction load is installed in a standby power shutdown socket device according to the present invention.

In order to correct the current / voltage accuracy by the photocoupler, the standby power cut-off receptacle apparatus of the present invention firstly supplies a correction load 190 and a correction load switch RCSW, which consume a constant power in a state where commercial power is supplied, 112, the correction load switch RCSW is turned on, and the correction load 190 is connected to the power output terminal 112 (S31).

As a result, a correction load current of a specific value intended by the user flows in the correction load 190. [

At this time, the corrected load current value is measured by a measuring device (not shown), and the corrected load current value measured by the measuring device and the corrected load 190 are stored in the memory.

When the correction switch CSW connected to the outlet control device 170 is turned on in step S32, the outlet control device 170 uses the correction load 190 and the correction load current as internal programs to calculate the initial correction value C _DEFAULT ), and stores the calculated initial correction value (C _DEFAULT ) and the corrected load current value in the memory.

If the correction load 190 is connected to the power output terminal 112, the controller 170 of the apparatus for controlling a standby power cut-off receptacle apparatus according to the present invention can control the amount of current corresponding to the current flowing to the correction load 190 A detection current value is provided.

That is, the current detection resistor R _PTN detects the current flowing to the correction load 190, and the first voltage V _CURRENT applied to the current detection resistor R _PTN is detected by the first differential amplifier 130 And the detected current value is input to the receptacle controller 170 through the first photocoupler 132, the first blocking capacitor C100, and the third differential amplifier 150. [

At this time, the detected current value sensed by the outlet control device 170 should coincide with the current value (corrected load current value measured by the measuring apparatus) flowing in the actual corrected load 190.

However, depending on the characteristics of the first photocoupler 132 according to the present invention, an error may occur between the detected current value and the corrected load current value.

In the present invention, when the detected current value is input to the outlet control device 170 in order to eliminate such an error, the outlet control device 170 reads the initial correction value C _DEFAULT from the memory (S33) the detected current value and correcting the load ratio of the current value and the initial correction value (C _DEFAULT) by multiplying the calculated current update the correction value (C _CAL-cURRENT) and (S34), the calculated current update the correction value (C _CAL-cURRENT) In the memory (S35).

After the correction values C _CAL-CURRENT and C _CAL-VOLTAGE are updated in this way, the correction load switch RCSW and the correction switch CSW are turned off to remove the correction load 190, Disconnect the standby power outlet device from the factory.

In the above description, only the method of calculating the current update correction value (C _CAL-CURRENT ) by the individual deviation of the photocoupler has been described. However, the voltage update correction value (C _CAL-VOLTAGE ) Can be calculated in the same manner as the calculation method of the correction value (C _CAL-CURRENT ).

That is, at the time of calculating the voltage update correction value (C _CAL-VOLTAGE ), a correction load voltage applied across the correction load 190 is used instead of the correction load current, and the voltage measurement value applied to the actual correction load, And calculates the voltage update correction value (C _CAL-VOLTAGE ) based on the error with the detected voltage value detected by the outlet control device 170 through the elements.

In the state where the current update correction value C _CAL-CURRENT and the voltage update correction value C _{CAL -VOLTAGE} are stored in the memory, the relay drive circuit 171, according to the control signal transmitted from the outlet control device 170, When the relay 121 turns on the relay 120, the current flowing in the electronic product and the voltage applied to the electronic product are transmitted through the first photocoupler 132 and the second photocouler 142, Lt; / RTI >

At this time, the outlet controller 170 corrects the current and the voltage by multiplying the detected current and the detected voltage by the current update correction value (C _CAL-CURRENT ) and the voltage update correction value (C _{CAL -VOLTAGE} ) And uses the correction voltage to calculate the active power currently consumed in the electronic product.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments.

In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

111: Power input terminal 112: Power output terminal
120: Relay 121: Relay driving circuit
130, 140, 150, 160: Differential amplifier
131, 141, 151, 161: DC offset supply section
132, 142: Photo coupler 170: Outlet control device
180: internal power supply 190: compensation load

Claims (12)

A relay installed between a power input terminal to which commercial power is inputted from the outside and a power output terminal to supply the commercial power to the electronic product;
A relay driving circuit for controlling a switching operation of the relay;
A current detecting resistor for detecting a current flowing between the power input terminal and the power output terminal;
A first photocoupler for outputting a first output voltage corresponding to a first voltage applied to the current detection resistor;
A second photocoupler for outputting a second output voltage corresponding to a second voltage applied to the power output terminal;
A first amplification voltage corresponding to the first output voltage and a second amplification voltage corresponding to the second output voltage are received to detect a zero cross point of the commercial power supply, And a receptacle controller for calculating the current active power consumed and controlling the relay driving circuit to detect whether the electronic product is in a standby state by comparing the current active power with a reference power value so that the relay is turned off Of the standby power cut-off receptacle device. The method according to claim 1,
A first differential amplifier for differentially amplifying the first voltage;
A second differential amplifier for differentially amplifying the second voltage;
A third differential amplifier for differentially amplifying the first output voltage from which the DC component is removed; And
Further comprising a fourth differential amplifier for differentially amplifying a second output voltage from which the direct current component is removed. The method according to claim 1,
A first DC offset supply unit for supplying a first DC offset to the first voltage;
A second DC offset supply unit for supplying a second DC offset to the second voltage;
A third DC offset supply unit for supplying a third DC offset to the first output voltage; And
And a fourth DC offset supply unit for supplying a fourth DC offset to the second output voltage. The method according to claim 1,
Wherein the current detection resistor is a copper pattern resistor formed on a printed circuit board. The method according to claim 1,
Further comprising switching means for manually turning on / off the relay, wherein the outlet control device senses an operation of the switching means to control the relay driving circuit. The method according to claim 1,
Wherein the outlet control device includes a memory in which a current update correction value by the first photocoupler and a voltage update correction value by the second photocoupler are stored. The method of claim 6,
The receptacle controller corrects the first amplification voltage using the current update correction value and corrects the second amplification voltage using the voltage update correction value and then calculates the current effective power. Standby power disconnecting receptacle device. A first step of respectively detecting a detection current corresponding to a current flowing in the electronic product and a detection voltage corresponding to a voltage applied to the electronic product, respectively;
A second step of the outlet control device calculating the correction current by correcting the detection current using the current update correction value, and calculating the correction voltage by correcting the detection voltage using the voltage update correction value;
A third step of calculating the current active power using the correction current and the correction voltage for a predetermined period from a zero cross point of a power source applied to the electronic product by the outlet control device; And
And a fourth step of detecting whether the electronic product is in a standby state by comparing the current active power with a reference power value so that power supply to the electronic product is cut off, A method of controlling an outlet device. The method of claim 8,
And the outlet control device removing the DC offset from the detection current and the detection voltage, respectively. The method of claim 8,
31. The method of claim 31, wherein the outlet control device calculates the instantaneous current AC value and the instantaneous voltage AC value at the correction current and the correction voltage, respectively,
32. The method of any one of the preceding claims, further comprising the step of: 32) multiplying the square of the instantaneous current AC value by the square of the instantaneous voltage AC value to cumulate the cumulative square power value;
And repeating the steps 31 and 32 until the number of times the outlet control device is cumulatively added reaches a preset number of times. And
And a 34th step of obtaining the current effective power by calculating a mean square power by dividing the accumulated cumulative square power value by the cumulative number of times and calculating a square root thereof by the outlet control device A method of controlling a device. The method of claim 8,
Wherein the outlet control device calculates and stores the current update correction value based on an error between a current measurement value actually flowing to the correction load and a detection current for the correction load detected by the outlet control device before the first step And a control unit for controlling the standby power interruption receptacle. The method of claim 8,
Wherein the outlet control device calculates and stores the voltage update correction value based on an error between a voltage measurement value actually applied to the correction load and a detection voltage for the correction load detected by the outlet control device before the first step Wherein the standby power cut-off receptacle device comprises:

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