KR20020006773A - connecting apparatus of power line for Power Line Communication on low power line - Google Patents

Abstract

PURPOSE: An apparatus for combining a power line for a power line communication in a low-voltage distribution network is provided not to be influenced by loads in home and effectively transmit a power line signal by installing a coupling and power line communication gateway in home. CONSTITUTION: A phase coupler(610) is installed in a power line(P) between a watt-hour meter(500) and a main breaker(700) for filtering only power line communication signal from a power signal inputted through the watt-hour meter(500) and providing the filtered signal to a power line communication outdoor module(620). The power line communication outdoor module(620) processes the power line communication signal inputted through the phase coupler(610), converts the processed power line communication signal into a digital signal, and provides the converted digital signal to a repeater module(630). The repeater module(630) transmits the digital power line communication signal received from the power line communication outdoor module(620) to a power line communication indoor module(640) by an Ethernet switching operation. An auxiliary separation filter(650) is installed in a secondary side of an auxiliary breaker(810) in which a power line modem(900) is installed. When a communication is performed between the power line communication indoor module(640) and the power line modem(900), the influence of loads connected to other auxiliary breakers(820-870) is removed to improve a communication efficiency.

Description

Power line coupling device for power line communication in low voltage distribution network {connecting apparatus of power line for Power Line Communication on low power line}

The present invention relates to a communication using a power line, and more particularly, power line communication in a low voltage distribution network intended to perform power line communication by installing a power line communication coupling device installed in a subscriber distribution panel for power line communication according to various low voltage distribution types. It relates to a power line coupling device for.

In general, power lines are facilities that are installed to supply power, which are not suitable for use as communication networks because their network configuration is complicated and their line characteristics are poor, but they are attracting attention as new communication networks due to the rapid development of communication technologies. There is a technique of transmitting a communication signal superimposed on the power line as described above, which is power line communication (PLC).

Conventional power line communication, however, uses various communication media such as general telephone line, cable TV network, optical cable network, and wireless to build a power automation system such as remote meter reading, distribution automation, and demand management. The optimal communication network construction method is not established. Therefore, to implement low-voltage distribution power line subscriber network by connecting indoor and outdoor, due to problems such as low impedance problem, signal interference, noise and multipath problem by domestic load, signal attenuation by branch, and signal attenuation by breaker There has been a problem in that it is difficult to efficiently transmit signals indoors or indoors to indoors or outdoors.

Accordingly, the present invention has been made to solve the above problems, by installing a coupling and power line communication gateway in the home to perform power line communication in a low-voltage distribution network that can effectively transmit power line signals without being affected by the load in the home It is an object to provide a power line coupling device for.

1 is a block diagram of a power line subscriber network using a low-voltage distribution network applied to the present invention.

2a to 2c is an embodiment of a single-phase power line communication coupling device according to the present invention.

3a and 3b is an embodiment of a signal separation filter for power line communication applied to the present invention.

4 is a view for explaining the detailed operation of the repeater module according to the present invention.

5a to 5b is a view showing a three-phase installation structure of the power line coupling device according to the present invention.

<Description of Symbols for Major Parts of Drawings>

100: high voltage distribution network 150: transformer

200: low voltage distribution network 250: power line router

300: backbone network 400: furniture

500: power meter 600: power line communication gateway

700: main breaker 800: auxiliary breaker

850: Powerline Modem

In order to achieve the above object, the present invention provides a low-voltage distribution network in which a meter circuit breaker, a main circuit breaker, and an auxiliary circuit breaker connected in parallel to a power line branched from the main circuit breaker are branched from a power line connected to the meter and the main circuit breaker. A phase coupler for filtering a high frequency power line communication signal from the power meter from the power meter; At least one power line communication outdoor module for converting the power line communication signal filtered by the phase coupler into a digital signal; A repeater module for relaying power line communication signals received by the at least one power line communication outdoor module by Ethernet switching; At least one power line communication indoor module for converting the power line communication signal relayed by the repeater module into an analog and providing the power line modem to restore to a baseband signal; And a power line communication gateway configured to be connected to a secondary side of the auxiliary circuit breaker in which the power line modem is installed, and an auxiliary separation filter configured to remove communication signal interference of loads.

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 power line subscriber network using a low-voltage distribution network according to the present invention.

Referring to FIG. 1, furniture 400 tied to one column transformer 150 is connected through a low voltage distribution network 200, and each furniture 400 is connected to an external communication network using one power line router 250. Connected with Each household 400 also has a power line subscriber network including a power meter 500, a power line communication gateway 600, a main breaker 700, an auxiliary breaker 800, and a power line modem 850.

The electricity meter 500 detects an amount of energy used in a load (a lamp, a home appliance, etc.) in a home by using the power provided by the low voltage distribution network 200, and filters the power line signal including a communication signal into a signal separation filter. Separated by the provided to the power line communication gateway 600. The power line communication gateway 600 separates a high frequency power line communication signal included in the power line signal by a signal separation filter, and provides the separated high frequency power line communication signal to the power line modem 850 by relaying by modulation and demodulation.

Here, the power line communication gateway 600 receives a signal from an external (or internal), demodulates the signal, and converts the signal into a frequency of a different baseband to transmit the signal to the internal (or external). In addition, the power line communication gateway 600 receives a signal from the outside (or inside), demodulates the signal, and then changes to the same frequency and prevents a collision between the power line communication signal and the power line signal by a separate filter.

The main breaker 700 is to cut off electricity introduced into the room through the power line communication gate 600, the auxiliary breaker 800 is installed for each of the spatial concept, such as a large electric load or room, this auxiliary The circuit breaker 800 cuts off the electrical accident at the load connected to the secondary side. Therefore, even if an electrical accident occurs in one load, the other loads connected to the other auxiliary breakers are normally supplied with electricity.

Therefore, when the auxiliary circuit breaker 800 is installed for each load, the secondary signal can be separated from the internal signal and the external signal by using a signal separation filter on the secondary side, and the signal is restored by transferring the signal through the power line communication gateway 600. The loss can be reduced.

2A is an embodiment of a single phase power line communication gateway in accordance with the present invention.

2A, the configuration includes a phase coupler 610, a power line communication outdoor module 620, a repeater module 630, a power line communication indoor module 640, and an auxiliary separation filter 650.

The phase coupler 610 is installed on the power line P between the electricity meter 500 and the main circuit breaker 700 to filter only the high frequency power line communication signal from the power signal input through the electricity meter 500 to be described later. The outdoor module 620 is provided. The power line communication outdoor module 620 converts the power line communication signal inputted through the phase coupler 610 into signal processing and digital signals and provides them to the repeater module 630. The repeater module 630 transmits the digital power line communication signal received from the power line communication outdoor module 640 to the power line communication indoor module 640 by an Ethernet switching operation. The auxiliary separation filter 650 is installed on the secondary side of the auxiliary circuit breaker 810 in which the power line modem 900 is installed. Therefore, when the communication between the power line communication indoor module 640 and the power line modem 900, the influence of the load connected to the other auxiliary circuit breaker (820-870) is removed to improve the communication efficiency.

Herein, the operation of the power line communication gateway having the above configuration will be described.

First, a power of 50-60 Hz is provided to the main circuit breaker 700 in a power signal including a communication signal input through the electricity meter 500. Then, the power signal is provided to the plurality of auxiliary circuit breakers 800 connected in parallel with the parking circuit 700 and the power line P. Therefore, the load terminal connected to the secondary side of the auxiliary circuit breaker 800 is supplied with normal power.

On the other hand, the power signal including the high-frequency power line communication signal branched from the electricity meter 500 is provided to the phase coupler 610, the phase coupler 610 is cut off the power of the low frequency 50-60Hz, high frequency Pass only the power line communication signal of the power line communication is provided to the outdoor module 620. At this time, the power line communication signal provided to the power line communication outdoor module 620 is converted into a digital signal and provided to the repeater module 630. Then, the repeater module 630 provides the input digital communication signal to the power line communication indoor module 640 by Ethernet switching. The power line communication indoor module 640 converts the relayed digital communication signal into an analog signal and applies the power line modem 900 connected to the household to perform communication by the power line.

In addition, an auxiliary separation filter 650 is installed between the auxiliary breaker 810 and the power line modem 900. The auxiliary separation filter 650 passes through a low frequency signal of 50-60 Hz for supplying electricity as a low pass filter and blocks a high frequency band. Accordingly, it is possible to prevent the high frequency communication signal output to the secondary side of the auxiliary circuit breaker 810 from being introduced into the power line modem 900. Therefore, when communicating between the power line communication indoor module 640 and the power line modem 900, there is no load influence elsewhere, thereby increasing communication efficiency.

Figure 2b is another embodiment of a single-phase power line communication gateway applied to the present invention.

Referring to FIG. 2B, the configuration includes a phase coupler 610, a power line communication outdoor module 620, a repeater module 630, a power line communication indoor module 640, an auxiliary separation filter 650, and a main separation filter 660. Is made of.

The main separation filter 660 is installed between the electricity meter 500 and the main circuit breaker 700 to supply only the low frequency power signal from the electricity meter 500 to the main circuit breaker 700. A plurality of auxiliary circuit breakers 800 branched through the power line P are installed at the rear end of the main circuit breaker 700, and power signals are supplied to loads connected to the secondary side of the auxiliary circuit breaker 800, respectively.

The phase coupler 610 is installed between the electricity meter 500 and the main separation filter 660 to filter the high-frequency power line communication signal from the power signal input through the electricity meter 500 to be described later. To provide. The power line communication outdoor module 620 converts the single-phase power line communication signal filtered through the phase coupler 610 into a digital signal and provides it to the repeater module 630. The repeater module 630 provides the power line communication signal received by the power line communication outdoor module 620 to the power line communication indoor module 640 by Ethernet switching. The power line communication indoor module 640 converts the power line communication signal provided from the repeater module 630 into a baseband analog signal and provides it to the power line modem 900.

Here, the power line communication outdoor module 620 and the power line indoor module 640 can prevent the collision of communication signals in the power line communication gateway by performing modulation and demodulation at different frequencies. The auxiliary separation filter 650 is installed on the secondary side of the auxiliary circuit breaker 810 in which the power line modem is installed, and performs communication between the power line communication indoor module 640 and another auxiliary breaker 820-870 when communicating with the power line modem. Eliminate the impact.

Herein, the operation of the power line communication gateway having the above configuration will be described.

First, the power of 50-60 Hz in the power signal including the communication signal input through the electricity meter 500 is filtered through the main separation filter 660 is provided to the main circuit breaker 700. At this time, the power line signal provided to the main circuit breaker 700 is branched by a plurality of auxiliary circuit breakers 800 are provided to the corresponding load (room 1, room 2, living room, lamp 1.).

In addition, the power signal including the high-frequency communication signal branched from the electricity meter 500 is provided to the phase coupler 610. At this time, the phase coupler 610 cuts the power of the low frequency 50-60Hz, Passes only the power line communication signal is provided to the power line communication outdoor module 620. At this time, the power line communication signal provided to the power line communication outdoor module 620 is converted into a digital signal and provided to the repeater module 630. Then, the repeater module 630 provides the input digital communication signal to the power line communication indoor module 640 by Ethernet switching. Accordingly, the power line communication indoor module 640 converts the relayed digital communication signal into an analog signal and applies the power line modem 900 connected to the room to perform communication by the power line.

Here, an auxiliary separation filter 650 is installed on the secondary side of the auxiliary circuit breaker 810 in which the power line modem 900 is installed. The auxiliary separation filter 650 passes through a low frequency signal of 50-60 Hz for supplying electricity as a low pass filter and blocks a high frequency band. And by the main separation filter 660 installed in front of the main circuit breaker 700 to prevent loads inside the house in the communication between the power line communication indoor module 640 and the power line communication outdoor module 620, The communication efficiency between the power line communication indoor module 640 and the power line modem 900 may be eliminated by eliminating the load influence of other places.

Figure 2c is another embodiment of a single-phase power line communication gateway applied to the present invention.

Referring to FIG. 2C, the configuration includes a main separation filter 660, a phase coupler 610, a power line communication outdoor module 620, a repeater module 630, a power line communication indoor module 640, and a plurality of auxiliary separation filters ( 660).

The main separation filter 660 is installed between the electricity meter 500 and the main circuit breaker 700 to filter only a power signal having a low frequency (50-60 Hz) from the electricity meter 500 to the main circuit breaker 700. A plurality of auxiliary circuit breakers 800 branched through the power line are installed at the rear end of the main circuit breaker 700. The phase coupler 610 is installed between the electricity meter 500 and the main separation filter 660 to receive a high frequency power line communication signal from the power signal input through the electricity meter 500, and then, the power line communication outdoor module 620 to be described later. The power line communication outdoor module 620 converts the power line communication signal input through the phase coupler 610 into a digital signal and provides the same to the repeater module 630. The repeater module 630 provides the power line communication signal received by the power line communication outdoor module 640 to the power line communication indoor module 640 by Ethernet switching. The plurality of auxiliary separation filters 660 are respectively installed on the secondary side of the plurality of auxiliary circuit breakers 800 in which the power line modem is installed. That is, the auxiliary separation filters 650-656 are all installed on the secondary side of each of the auxiliary circuit breakers 810-870 to separate the respective rooms.

Herein, the operation of the power line communication gateway having the above configuration will be described.

First, the power of 50-60Hz in the power signal including the communication signal input through the electricity meter 500 is filtered through the main separation filter 660, a plurality of auxiliary breakers branched by the power line through the main breaker 700 Provided at 800. At this time, the load terminal connected to the secondary side of the auxiliary circuit breaker 800 is supplied with normal power.

On the other hand, the power signal including the high-frequency communication signal branched from the electricity meter 500 is provided to the phase coupler 610, the phase coupler 610 is cut off the power of the low frequency 50-60Hz, Only the power line communication signal is passed, and the power line communication signal is provided to the power line communication outdoor module 620. At this time, the power line communication signal provided to the power line communication outdoor module 620 is converted into a digital signal and provided to the repeater module 630. Then, the repeater module 630 provides the input digital communication signal to the power line communication indoor module 740 by Ethernet switching. Accordingly, the power line communication indoor module 640 converts the relayed digital communication signal into an analog signal and applies it to the power line modem 900 connected to the room to perform communication by the power line.

Secondary separation filters 650-651 are installed at the secondary sides of the plurality of auxiliary circuit breakers 810-870, and a power line modem 900 is installed at a rear end of the auxiliary separation filter 650. Therefore, the sub-separation filter 650-656 is a low pass filter, and passes the low-frequency signal of 50-60 Hz and blocks the high frequency band from the electric signal provided from each of the auxiliary circuit breakers 810-870.

Therefore, the load inside the house is prevented from affecting the communication between the power line communication indoor module 640 and the power line communication outdoor module 620 by the main separation filter 660 installed in front of the main breaker 700. A plurality of auxiliary separation filters 650-656 may remove the influence of other loads to increase the communication efficiency between the power line communication indoor module 640 and the power line modem 900.

3a and 3b is a structure of a signal separation filter applied to the present invention.

The main separation filter and the auxiliary separation filter used in the present invention have a low pass filter function, and are designed to pass a low frequency signal of 50-60 Hz for supplying electricity and block a high frequency band. 3A is a signal separation filter for two-wire communication for a differential transmission / reception scheme, in which Line 1 and Line 2 are designed to be symmetrical to each other.

3B is a structure of a signal separation filter when lines 1 and 2 around line 2 couple signals to lines 3 and 2; That is, the three-phase signal separation filter inputs signals at both ends to receive a signal with a magnitude difference between the signals at both ends of the receiving end.

4 is a configuration diagram illustrating the detailed operation of the repeater module according to the present invention.

Referring to FIG. 4, the configuration includes an ethernet switching unit 632 and a memory 634. The Ethernet switching unit 632 supports several communication ports independently of each other to simultaneously connect one or more power line communication outdoor modules (620a, 620b, ... 620n). One or more power line communication indoor modules 640a, 640b, ... 640n are connected to the Ethernet switching unit 632, and the power line communication indoor modules 640a, 640b, ... 640n are each separated signal filters. Is connected to. Therefore, signal independence is maintained between the power line communication indoor modules 640a, 640b, ... 640n.

In addition, the power line communication indoor modules (620a, 620b, ... 620n) and the power line communication outdoor modules (620a, 620b, ... 620n) are connected to each other in parallel by the Ethernet switching unit 632 and the Ethernet MAC method, demodulation method And it is possible to connect the same power line module of the same frequency band.

That is, the Ethernet MAC input / output method applied to the present invention is a control method for efficient use of transmission paths by multiple LAN terminals sharing the same transmission, and Ethernet is a LAN corresponding to one or two layers of the OSI seven layers. This is a standard specification. Here, the two layers are divided into a link layer control (LLC) layer and a medium access control (MAC) layer. Here, the LLC layer controls the connection and flow of the upper layer and the MAC layer, and the MAC layer is responsible for almost all functions of the actual two layers. Therefore, the MAC layer divides the packet from the upper layer into frame units and performs address management, transmission, error checking, and flow control.

5A is an embodiment of a power line communication gateway installed on three phases according to the present invention.

Referring to FIG. 5A, the configuration includes a three-phase coupler 615, a power line communication outdoor module 625, a repeater module 635, a power line communication indoor module 645, and a three-phase auxiliary separation filter 660.

The three-phase coupler 615 is installed on the secondary side of the electricity meter 500, and receives a high-frequency power line communication signal from the three-phase power signals R, S, and T input through the electricity meter 500 to be described later. The outdoor module 625 is provided. The power line communication outdoor module 625 converts the three-phase power line communication signal input through the three-phase coupler 615 into digital signals and provides them to the relay module 635. The repeater module 635 provides the power line communication signal received from the power line communication outdoor module 645 to the power line communication indoor module 645 in an Ethernet switching operation in a digital form. The plurality of three-phase auxiliary separation filters 660 are respectively installed on the secondary side of the plurality of three-phase auxiliary circuit breakers (not shown). That is, the auxiliary separation filter 660 is installed on the secondary side of each three-phase auxiliary circuit breaker to separate each load.

Herein, the operation of the power line communication gateway having the above configuration will be described.

First, the three-phase power signal including the high-frequency communication signal branched from the electricity meter 500 is provided to the three-phase coupler 615, the three-phase coupler 615 is cut off the power of the low frequency 50-60Hz, Only the high frequency power line communication signal is passed through and provided to the power line communication outdoor module 625. At this time, the power line communication signal provided to the power line communication outdoor module 625 is converted into a digital signal and provided to the repeater module 635. The repeater module 635 then provides the input digital communication signal to the power line communication indoor module 645 by Ethernet switching. The power line communication indoor module 645 converts the relayed digital communication signal into an analog signal and applies the power line modem to the power line modem to perform communication by the power line.

In addition, three-phase auxiliary separation filters 660 are respectively installed at the secondary sides of the plurality of auxiliary circuit breakers. The three-phase sub-separation filter 660 is a low pass filter that passes a low-frequency signal of 50-60Hz for supplying electricity and blocks a high frequency band. Therefore, there is no load influence on the communication between the power line communication indoor module 645 and the power line modem, thereby improving communication efficiency.

5B is another embodiment of a power line communication gateway installed on three phases according to the present invention.

Referring to Figure 5b, the configuration is a three-phase coupler 615, power line communication outdoor module 625, repeater module 635, power line communication indoor module 645, three-phase auxiliary separation filter 660 and three-phase main Separation filter 665 is included.

The three-phase coupler 615 is installed on the secondary side of the electricity meter 500, and receives a high-frequency power line communication signal from the three-phase power signals R, S, and T input through the electricity meter 500 to be described later. The outdoor module 625 is provided. The power line communication outdoor module 625 converts the three-phase power line communication signal input through the three-phase coupler 615 into digital signals and provides them to the relay module 635. The repeater module 635 provides the power line communication signal received from the power line communication outdoor module 645 to the power line communication indoor module 645 by Ethernet switching operation. Therefore, the power line communication indoor module 645 performs power line communication by applying to the power line modem through the three-phase power line communication signal.

On the other hand, the plurality of three-phase auxiliary separation filter 660 is installed on the secondary side of the auxiliary circuit breaker (not shown), respectively. That is, the three-phase auxiliary separation filter 660 may be installed on the secondary side of the auxiliary circuit breaker to remove the influence of the load side when the power line modem and the power line communication indoor module 645 perform power line communication.

Herein, the operation of the power line communication gateway having the above configuration will be described.

The three-phase power signal including the high-frequency communication signal branched from the electricity meter 500 is provided to the three-phase coupler 615, the three-phase coupler 615 is cut off the power of the low frequency 50-60Hz, Only the power line communication signal of the frequency is passed, and the power line communication signal is provided to the power line communication outdoor module 625. At this time, the power line communication signal provided to the power line communication outdoor module 625 is converted into a digital signal and provided to the repeater module 635. The repeater module 635 then provides the input digital communication signal to the power line communication indoor module 645 by Ethernet switching. The power line communication indoor module 645 converts the relayed digital communication signal into an analog signal and applies the power line communication to the power line modem connected to the room to perform communication by the power line.

In addition, the three-phase auxiliary separation filter 660 is installed at the secondary side of the plurality of three-phase auxiliary circuit breakers. The three-phase auxiliary separation filter 660 is a low pass filter that passes a low-frequency signal of 50-60 Hz for supplying electricity and blocks a high frequency band. Therefore, there is no load influence on the communication between the power line communication indoor module 645 and the power line modem, thereby improving communication efficiency.

As described above, the present invention can reduce the loss of the signal in power line communication to transmit to the internal plug to increase the coverage of power line communication.

In addition, by separating the power line communication signals between the inside and the outside of the house by using a separation filter, a signal used in one home is not transmitted to another home, so that security of each home can be pursued. In addition, by using the serial signal separation filter, the frequency used in the house can be used outside the house, so the overall transmission speed can be increased by improving the frequency efficiency.In the house, by using the same frequency, independent channels can be provided to multiple rooms. The transmission speed can be increased.

Herein, although the present invention has been described with reference to the preferred embodiments, those skilled in the art can variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

Claims (13)

In a low-voltage distribution network in which a power meter, a main breaker, an auxiliary breaker connected in parallel to a power line branched from a main breaker, and a power line modem are installed in a household to perform power line communication through the power line, And a power line communication gateway that separates the power line communication signal from the power signal from the electricity meter, and relays the separated power line communication signal to the power line modem in an Ethernet switching operation to transmit different data at the same frequency. Power line coupling device for power line communication in a distribution network. The power line communication gateway of claim 1, wherein A phase coupler branched from a power line connected to the meter and a main breaker to filter a high frequency power line communication signal from a power meter; At least one power line communication outdoor module for converting the power line communication signal filtered by the phase coupler into a digital signal; A repeater module for relaying the power line communication signals received by the at least one power line communication outdoor module with Ethernet switching; At least one power line communication indoor module for converting the power line communication signal relayed by the repeater module into a baseband analog and providing the same to the power line modem; And The power line communication in the low voltage distribution network is connected to the secondary side of the auxiliary circuit breaker in which the power line modem is installed, and is composed of an auxiliary separation filter for separating the high frequency power line communication signal and the low frequency power line signal to remove the communication signal interference of the loads. Power line coupling device. The power line communication gateway of claim 1, wherein A phase coupler branched from a power line connected to the meter and a main breaker to filter a high frequency power line communication signal from a power meter; At least one power line communication outdoor module for converting the power line communication signal filtered by the phase coupler into a digital signal; A repeater module for relaying the power line communication signal received by the at least one power line communication outdoor module by an Ethernet switching operation; At least one power line communication indoor module for converting the power line communication signal relayed by the repeater module into an analog and providing the same to the power line modem; An auxiliary separation filter connected to a secondary side of an auxiliary circuit breaker provided with the power line modem to remove communication signal interference of loads; And And a main separation filter connected to a power line between the power meter and the main circuit breaker, and configured to filter only a low frequency power signal input from the power meter and provide the main circuit breaker to the main circuit breaker. The power line communication gateway of claim 1, wherein A phase coupler branched from a power line connected to the meter and a main breaker to filter a high frequency power line communication signal from a power meter; At least one power line communication outdoor module for converting the power line communication signal filtered by the phase coupler into a digital signal; A repeater module which relays the power line communication signal received by the at least one power line communication outdoor module to an Ethernet switching operation; At least one power line communication indoor module for converting the power line communication signal relayed by the repeater module into an analog and providing the same to the power line modem; A plurality of auxiliary separation filters installed at secondary sides of the plurality of auxiliary circuit breakers branched from the parking circuit breakers, respectively, to remove communication signal interference of loads; And And a main separation filter connected to a power line between the power meter and the main circuit breaker, and configured to filter only a low frequency power signal input from the power meter and provide the main circuit breaker to the main circuit breaker. 5. The power line coupling device of claim 2, wherein the power line communication outdoor module and the power line communication indoor module are modulated and demodulated in different frequency bands to communicate with a power line modem. The low voltage multiplier according to claim 2, wherein the repeater module includes an Ethernet switching unit and a memory, and is connected to at least two or more power line communication outdoor modules and a power line communication indoor module by an Ethernet MAC method. Power line combiner for power line communication in view. [5] The method of claim 2, wherein the auxiliary separation filter is a two-wire low pass filter according to a differential transmission / reception scheme, wherein lines 1 and 2 are symmetrical by reactance and capacitor. Power line coupling device. The method according to claim 2, wherein at least two or more power line communication outdoor modules and power line communication indoor modules connected to the repeater module are formed in the same pair and can operate independently of each other by Ethernet switching. Power line coupling device for power line communication. The method of claim 3, wherein the main separation filter is characterized in that the loads drawn from the parking short circuit does not affect the power communication when the power communication between the at least two communication line power outdoor module and the electricity meter. Power line coupling device for power line communication in low voltage distribution network. The power line communication gateway of claim 1, wherein A three-phase coupler branched from a three-phase power line connected to the electricity meter and the main breaker to filter a high frequency power line communication signal from the power meter; At least one power line communication outdoor module coupled to the three-phase coupler to convert the filtered power line communication signal into a digital signal; A repeater module which relays the power line communication signal received by the at least one power line communication outdoor module to an Ethernet switching operation; At least one power line communication indoor module coupled to the repeater module to convert the relayed power line communication signal into an analog and provide the same to the power line modem; And And a plurality of three-phase auxiliary separation filters installed on the secondary side of the plurality of auxiliary circuit breakers branched from the main circuit breaker to remove the communication signal interference of the loads. The power line communication gateway of claim 1, wherein A three-phase coupler branched from a three-phase power line connected to the electricity meter and the main breaker to filter a high frequency power line communication signal from the power meter; At least one power line communication outdoor module coupled to the three-phase coupler to convert the filtered power line communication signal into a digital signal; A repeater module which relays the power line communication signal received by the at least one power line communication outdoor module to an Ethernet switching operation; At least one power line communication indoor module coupled to the repeater module to convert the relayed power line communication signal into an analog and provide the same to the power line modem; At least one or more three-phase auxiliary separation filters each installed on a secondary side of the plurality of auxiliary circuit breakers branched from the main circuit breaker to remove communication signal interference of loads; And The power line in the low-voltage distribution network, characterized in that it is connected to the power line between the electricity meter and the main circuit breaker comprising a power line communication gateway consisting of a three-phase main separation filter for filtering only the low-frequency power signal input from the electricity meter to the main breaker Power line coupling device for communication. 12. The apparatus of claim 10 and 11, wherein the power line communication outdoor module and the power line communication indoor module are modulated and demodulated in different frequency bands to communicate with a power line modem. The method of claim 10, wherein the three-phase auxiliary separation filter is a three-wire low pass filter according to a differential transmission and reception method, line 1 and line 2 based on line 2, line 3 and line 2 are mutually reacted by a reactance and a capacitor. Power line coupling device for power line communication, characterized in that consisting of a symmetrical structure.