JP2021097260A - Power line communication system - Google Patents

Abstract

To reduce noise contained in a PLC signal separated from a power signal in a communication (PLC) system that uses a power line used to supply power from a commercial power source.SOLUTION: A PLC system includes a lead-in power line 11 that supplies commercial power stepped down by a transformer to a house, a watt-hour meter WM connected to the lead-in power line 11, an AC/DC power converter 6 that is connected to the secondary side of the watt-hour meter WM and converts AC power into DC power, a distribution board D that distributes the DC power supplied from the AC/DC power conversion device 6 to a plurality of home power lines PL, and a plurality of terminals connected to the plurality of home power line PLs via a PLC modem, and the AC/DC power conversion device 6 is provided in a housing H including the watt-hour meter WM inside, and performs communication by superimposing a PLC signal on a DC power signal.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power line communication (PLC) system.

PLC is a technology for performing data communication by superimposing a carrier wave on a power line drawn into each home such as AC100V and AC200V. As shown in FIG. 5, a network is constructed by connecting a PLC modem 91 to an outlet 92 arranged in each room in the home. When the plug provided in the PLC modem 91 is plugged into the outlet 92, power is supplied to the PLC modem 91, the PLC signal as a communication signal is superposed on the power signal and sent out, and the PLC signal superimposed on the power signal is sent out. Is received separately from the power signal.

The PLC signal superimposed on the power signal by the PLC modem 91 and output to the power line is received by the PLC modem 91 connected to another outlet 92 through the home power line PL arranged in the home, or It is connected to the Internet via a public line 94 such as an existing optical fiber via a parent PLC modem (not shown) provided on the secondary side of an outdoor transformer TF through a power meter WM and a lead-in power line 11. It is transmitted to the server 96, the database 97, the mobile terminal 98, and the like.

On the other hand, the communication signal sent from the public line 94 such as an optical fiber is superimposed on the power signal by the parent PLC modem (not shown) provided on the secondary side of the transformer TF, and the lead-in power line 11 and the watt-hour meter WM. It is sent to the home through, taken out from the home power line PL by the PLC modem 91 connected to the outlet 92, and received by a home appliance such as a personal computer. This makes it possible, for example, to turn on / off home appliances at home from an SNS terminal such as a smartphone while away from home.

As described above, the PLC system uses the service line 11 already provided in the general household and the power line PL in the house arranged in the house as a communication line, and can provide a communication line with less burden on the consumer. There are advantages.

The electric power drawn into the home from the transformer TF by the lead-in power line 11 is branched into a plurality of electric powers in the distribution board D and supplied to the outlet 92 or various home electric devices (terminals), respectively. From the viewpoint of checking the electric capacity and ensuring the safety of indoor wiring, the distribution board D is equipped with a limiter Li, a main breaker Br, and a plurality of branch breakers 5, and the home power line PL is connected to these breakers 5. doing. In some areas, the limiter Li is not installed on the distribution board D. Since the PLC signal is attenuated each time it passes through these main breaker Br and branch breaker 5, it may be necessary to arrange a relay device or the like for amplifying the signal voltage on the distribution board or the like in the PLC system.

Therefore, in order to suppress the attenuation of the PLC signal, a technique for transmitting and receiving the PLC signal by bypassing the main breaker Br and the branch breaker 5 has also been proposed (for example, Patent Documents 1 and 2).

JP-A-2015-23505 JP-A-2010-62887

However, even when the PLC signal is transmitted / received by bypassing the main breaker Br and the branch breaker 5, there is a problem that the PLC signal separated from the AC power signal still contains a lot of noise.

The present invention has been made in view of such conventional problems, and an object of the present invention is to further reduce noise contained in a PLC signal separated from a power signal.

The PLC system according to the present invention that achieves the above object is a communication (PLC) system using a power line used for power supply from a commercial power source, and is a lead-in power line that supplies commercial power stepped down by a transformer into a house. From the power meter connected to the lead-in power line, the AC / DC power conversion device connected to the secondary side of the power meter to convert AC power into DC power, and the AC / DC power conversion device. The AC / DC power conversion device includes a distribution board for distributing the supplied DC power to a plurality of home power lines and a plurality of terminals connected to the plurality of home power lines via a PLC modem. It is provided in a housing provided with a power meter inside, and is characterized in that a PLC signal is superimposed on a DC power signal to perform communication.

In the PLC system having the above configuration, it is preferable that the watt hour meter has a power amount measuring function and a communication function.

In the PLC system having the above configuration, the distribution board has a main breaker in which the power line from the AC / DC power conversion device is connected to the primary side, and a plurality of branch breakers connected to the secondary side of the main breaker. The plurality of in-house power lines may be connected to the secondary side of the plurality of branch breakers.

In the PLC system having the above configuration, a plurality of first couplers provided on the in-house power line side of each of the plurality of branch breakers to superimpose the PLC signal on the DC power signal and / or separate the PLC signal from the DC power signal. A configuration may further include a control unit that controls the PLC by superimposing the PLC signal separated from the DC power signal by the predetermined first coupler among the plurality of first couplers on the DC power signal by the other first coupler. ..

In the PLC system having the above configuration, the control unit further includes a second coupler provided on the primary side of the main breaker, which superimposes the PLC signal on the DC power signal and / or separates the PLC signal from the DC power signal. Superimposes the PLC signal separated from the DC power signal by the second coupler on the DC power signal by the first coupler, or superimposes the PLC signal separated from the DC power signal by the first coupler on the DC power by the second coupler. The PLC may be controlled by superimposing it on the signal.

In the PLC system having the above configuration, the control unit may be provided in the housing.

The PLC system having the above configuration may further include a storage battery, and the control unit may supply power from the storage battery to the home via the plurality of branch breakers when the power supply from the commercial power source is stopped. ..

In the PLC system having the above configuration, the terminal has a plug for receiving power supply, and an outlet having a plug to which the plug can be connected is provided at the end of the home power line. The outlet may be configured to include a DC / AC power converter that converts DC power into AC power and / or a DC / DC power converter that converts the voltage of DC power.

In the PLC system of the present invention, the PLC signal is superimposed on the power signal converted from AC power to DC power by the AC / DC power converter connected to the secondary side of the watt-hour meter and communicated. It is possible to further reduce the noise contained in the PLC signal separated from the power signal as compared with the conventional system in which the PLC signal is superimposed on the power signal.

If the watt-hour meter is a so-called smart meter that has both electric energy measurement and wireless communication communication function, it can be connected to a communication network outside the home by using the communication function of the smart meter, and the PLC signal becomes AC power. Communication is possible without being superimposed, and low noise communication is possible.

It is a schematic circuit diagram which shows one Embodiment of the PLC system which concerns on this invention. It is a circuit diagram which shows an example of the coupler which can be used in this invention. It is a perspective view which shows an example of the outlet 3 which can be used in the PLC system which concerns on this invention. It is a perspective view which shows an example of the plug 4 which can be used in the PLC system which concerns on this invention. It is a figure which shows the configuration example of the conventional PLC system.

Hereinafter, the PLC system according to the present invention will be described in more detail with reference to the drawings, but the present invention is not limited to these embodiments.

FIG. 1 is a schematic circuit diagram showing an embodiment of a PLC system according to the present invention. As shown in FIG. 1, the commercial power reduced in voltage by the transformer TF (see FIG. 5) is sent to the AC / DC power converter 6 by the lead-in power line 11 through the watt-hour meter WM. Then, the AC / DC power conversion device 6 converts the AC power into DC power and supplies the AC power to the distribution board D provided at a predetermined position in the house.

The watt-hour meter WM used in the present invention is not particularly limited, and conventionally known ones can be used, but a smart meter having a communication function in addition to measuring the electric energy is preferable. This is because signal communication between the inside of the house and the outside of the house can be performed by using the communication function of the smart meter. Currently, there are three communication methods for smart meters: wireless multi-hop communication method, N communication method (using communication carriers such as mobile phones and WiMAX), and PLC method. A method suitable for the above is appropriately selected and used.

As the AC / DC power converter 6, a conventionally known one can be used. The AC / DC power converter 6 converts, for example, AC (alternating current) 100V to DC (direct current) 48V. Then, as will be described later, the power conversion device 33 of the outlet 3 further DC / AC conversion or DC / DC conversion to obtain the power and voltage that can be used by the terminal.

The distribution board D includes a limiter Li, a main breaker Br, a switching unit 21, and a plurality of branch breakers 5a, 5b, 5c ... (They may be collectively referred to as "branch breaker 5"). And are provided. A storage battery B is connected to the switching unit 21, and a solar cell SC is connected to the storage battery B.

The limiter Li is a device that cuts off the power supply when a current of amperes or more specified by a contract with an electric power company flows. As the limiter Li used in the present invention, conventionally known ones can be used. Depending on the electric power company, the limiter Li may not be required.

The main breaker Br detects the current in the entire home and breaks the circuit when the rated current is exceeded. As the main breaker Br used in the present invention, conventionally known ones can be used.

Normally, the switch 21 supplies the power converted from alternating current to direct current by the AC / DC power conversion device 6 to each terminal via the branch breaker 5 and also supplies it to the storage battery B. The electric power supplied to the storage battery B is stored in the storage battery B. Further, the storage battery B is connected to the photovoltaic power generation SC, and the electric power generated by the photovoltaic power generation SC is stored in the storage battery B. On the other hand, in the event of a power failure, the stored power of the storage battery B is supplied to the terminal via the switching unit 21 and the branch breaker 5.

The branch breaker 5 is divided according to the application such as "lighting equipment on the second floor" and "living room outlet on the first floor", and breaks the circuit when the current used exceeds the rated current. As the branch breaker 5 used in the present invention, a conventionally known one can be used.

As shown in the circuit diagram of FIG. 1, one of the AC / DC power converters 6 connected to the transformer TF (see FIG. 5) via the watt-hour meter WM on the primary side. A lead-in power line 11 including a sex line N and two power lines L1 and L2, for a total of three lines, is connected. Then, the AC / DC power converter 6 converts the AC power into DC power, and the AC / DC power converter 6 connects the connecting line 12 consisting of two trunk lines to the primary side of the extension limiter Li. There is. The limiter Li and the main breaker Br are connected by a connecting line 13. A plurality of branch breakers 5 are connected to the connecting line 14 after the connecting line 14 extends from the limiter Li and passes through the switching unit 21.

Then, a home power line PL is connected to the secondary side of each branch breaker 5. The home power line PL is wired indoors and connected to an outlet 3 or a terminal arranged at a predetermined position, respectively. The outlet 3 includes an insertion unit 31, a PLC modem 32 that superimposes and separates a power signal and a PLC signal, and a power conversion device 33. The power conversion device 33 includes a DC / AC power conversion device that converts DC power into AC power and a DC / DC power conversion device that converts DC power into a predetermined voltage.

Terminals such as air conditioner Ac, lighting equipment LE, and personal computer PC have a plug 4 for receiving power supply, and the plug 4 is connected to the plug 31 of the outlet 3 to connect the terminal. Power is supplied to the machine and PLC communication becomes possible.

According to the PLC system of the present invention in which the PLC signal is superimposed on the DC power signal as described above and the PLC signal is separated from the DC power signal, the conventional PLC system in which the PLC signal is superimposed / separated on the AC power signal can be used. In comparison, the noise contained in the PLC signal separated from the power signal is significantly reduced, and the communication accuracy is improved.

Further, from the viewpoint of suppressing the attenuation and noise of the PLC signal, it is desirable to transmit and receive the PLC signal by bypassing the main breaker Br and the branch breaker 5. As shown in FIG. 1, first couplers 7a to 7c are attached to the secondary side of each branch breaker 5. Further, a second coupler 8 is attached to the connection line 12 connected to the primary side of the limiter Li. The first couplers 7a to 7c and the second coupler 8 are devices for superimposing the PLC signal on the DC power signal and / or separating the PLC signal from the DC power signal, and are composed of an inductive coupler and a capacitive coupler. To.

FIG. 2 shows a circuit diagram showing an example of a coupler that can be used in the present invention. The coupler shown in this figure separates the PLC signal from the coupling circuit unit 71, the transmission circuit unit 72 that amplifies the PLC signal and superimposes it on the DC power signal, and transmits it, and the DC power signal captured through the coupling circuit unit 71. It has a receiving circuit unit 73. The PLC signal separated from the DC power signal by the receiving circuit unit 73 is sent to the control unit C, while the PLC signal sent from the control unit C is superposed and sent out by the transmitting circuit unit 72.

The control unit C controls which of the first couplers 7a to 7c or the second coupler 8 superimposes the PLC signals sent from the first couplers 7a to 7c and the second coupler 8 on the DC power signal. For example, in the PLC system shown in FIG. 1, when an operation signal (PLC signal) such as an on / off signal of an air conditioner Ac or a set temperature signal is output from a personal computer PC, the operation signal is converted into a DC power signal by the PLC modem 32. It is superposed and sent to the branch breaker 5c through the outlet 3 and the home power line PL. Then, the operation signal sent toward the branch breaker 5c is separated from the DC power signal by the first coupler 7c attached to the secondary side of the branch breaker 5c and sent to the control unit C. The control unit C superimposes the operation signal from the PC on the DC power signal by the first coupler 7b attached to the secondary side of the branch breaker 5b to which the home power line PL that sends power to the air conditioner Ac is connected. The operation signal superimposed on the DC power signal passes through the home power line PL, is separated from the DC power signal by the PLC modem 32 of the outlet 3, reaches the air conditioner Ac, and the operation of the air conditioner Ac is controlled.

When the operation signal of the air conditioner Ac is sent from outside the house by using the communication function of the watt-hour meter (smart meter) WM, the operation signal is AC by the PLC modem (not shown) in the watt-hour meter WM. It is superimposed on the DC power signal after being converted from AC to DC by the / DC power conversion device 6 and sent to the limiter Li via the connection line 12. Then, as shown in FIG. 1, the operation signal is separated from the DC power signal by the second coupler 8 provided on the primary side of the limiter Li and sent to the control unit C. In the same manner as described above, the control unit C uses the first coupler 7b attached to the secondary side of the branch breaker 5b to which the in-house power line PL that sends power to the air conditioner Ac is connected to transmit the operation signal from the PC to the DC power signal. Superimpose on. The operation signal superimposed on the DC power signal passes through the home power line PL, is separated from the DC power signal by the PLC modem 32 of the outlet 3, reaches the air conditioner Ac, and the operation of the air conditioner Ac is controlled.

According to such a system, since the operation signal (PLC signal) is transmitted by bypassing the main breaker Br and the branch breaker 5, the signal attenuation during transmission is suppressed.

Here, the AC / DC power conversion device 6 is provided in the housing H in which the watt-hour meter WM is housed. As a result, when the watt-hour meter WM is a smart meter, it is possible to connect to a communication network outside the home by using the communication function of the smart meter. In particular, when the communication method of the smart meter is wireless multi-hop communication method and N communication method, the PLC signal transmitted from inside the house to outside the house by the PLC modem (not shown) in the watt-hour meter WM is While separated from the DC power signal and transmitted wirelessly, the PLC signal transmitted from outside the house to the inside of the house is superimposed on the DC power signal and sent to the home power line PL via the connection line 12. That is, since the PLC signal communicated between the inside of the house and the outside of the house is not superimposed on the AC power, low noise communication is possible as compared with the conventional case where the PLC signal is superimposed on the AC voltage signal.

(Outlet)
Most terminals such as home electric devices in recent years are driven by DC power, but since the conventional home power supply is AC power, AC power is used inside the terminal or in a plug extending from the terminal. It was converted to DC power. On the other hand, in the PLC system of the present invention, since the home power supply is DC power, it is not necessary to convert AC power into DC power when using the terminal. However, even with DC power, the drive voltage differs depending on the terminal, so the outlet 3 used in the PLC system of the present invention includes a power conversion device 33. The power conversion device 33 includes a DC / AC power conversion device that converts DC power into AC power, and a DC / DC power conversion device that converts the voltage of DC power.

In the DC / AC power conversion device, a terminal that converts the DC voltage converted to 48V DC voltage in the AC / DC power conversion device 6 and sent to the outlet 3 into 100V or 200V AC power and drives the AC power. It can be supplied to the machine. In the DC / DC power conversion device, for example, the DC voltage converted into a DC voltage of 48V by the AC / DC power conversion device 6 and sent to the outlet 3 is 0V, 6V, 12V, 24V, 48V, 50V, 100V, 150V. It is converted to multiple DC voltages such as, and can be selectively used according to the working voltage determined by the terminal.

FIG. 3 shows a perspective view showing an example of the outlet 31 of the outlet 3 used in the present invention. The insertion port 31 shown in FIG. 3 has an insertion portion 31a for AC power and an insertion portion 31b for DC power. Since the insertion portion 31a for AC power has the same shape and structure as the conventional one, the description thereof will be omitted here.

The plug-in portion 31b for DC power has a hole shape into which a plug 4 described later can be inserted, and includes a plurality of supply electrodes corresponding to different supply voltages in the hole. Specifically, the insertion portion 31b for DC power has a first hole portion 311 having a square opening and a predetermined length in the depth direction, and a first hole portion 311 at the center of the inner side surface of the first hole portion 311. It has a second hole portion 312 having an opening smaller than the hole portion 311 and having a predetermined depth direction length.

Grooves 313a to 313d extending in the depth direction with a predetermined width are formed at the central portions of the four inner side surfaces of the first hole portion 311 in the left-right direction or the up-down direction (only the grooves 313a and 313b are shown in FIG. 3). Supply electrodes 34a to 34d (only supply electrodes 34a and 34b are shown in FIG. 3) are formed on the bottom surfaces of the grooves 313a to 313d.

Further, grooves 314a to 314d extending in the front-rear direction with a predetermined width are formed on the four inner side surfaces of the second hole portion 312 in the central portion in the left-right direction or the up-down direction, respectively (only the grooves 314a and 314b are shown in FIG. 3). , Supply electrodes 35a to 35d (only supply electrodes 35a and 35b are shown in FIG. 3) are formed on the bottom surfaces of the grooves 314a to 314d. Due to such a structure, the insertion portion 31b has eight supply electrodes 34a to 34d and 35a to 35d, and each supply electrode receives DC power such as 0V, 6V, 12V, 24V, 48V, 50V, 100V, 150V. Be supplied. From the viewpoint of safety, high-voltage power is supplied to the supply electrodes located away from the opening of the first hole, that is, the supply electrodes 35a to 35d provided on the inner surface of the second hole 312. It is desirable that a low voltage is supplied to the supply electrodes 34a to 34d provided on the inner peripheral surface of the first hole.

Further, the second USB connector 36 is formed so as to extend toward the front in the central portion of the inner side surface of the second hole portion 312, and the tip of the second USB connector 36 is formed in the first hole portion. It is located slightly out of reach of the back side of 311.

(Plug-in plug)
FIG. 4 shows a perspective view showing an example of the plug 4 according to the present invention. The plug 4 of FIG. 4 is provided at the tip of the power cord 40 extending from the terminal device, and can be plugged into the plug 31b of the plug 31 of the outlet 3 shown in FIG. .. That is, the plug 4 has a substantially rectangular parallelepiped plug body 41 in which the power cord 40 extends from the rear surface, and a protrusion 42 formed on the front surface of the plug body 41 and projecting forward (insertion direction). Have. The protrusion 42 has a square columnar first protrusion 421 protruding forward and a cross-sectional shape perpendicular to the front-rear direction protruding forward in the central portion of the front surface of the first protrusion 421, which is smaller than that of the first protrusion 421. It has a square columnar second protrusion 422. A quadrangular hole 43 recessed rearward is formed on the front surface of the second protrusion 422, leaving a flange portion having a predetermined width inward from the outer peripheral edge, and a USB second is formed in a substantially central portion of the rear surface of the hole 43. 1 The connector 46 is formed so as to extend in the forward direction.

The first protrusion 421 and the second protrusion 422 have a shape that can be fitted into the first hole 311 and the second hole 312 of the insertion portion 31b of the outlet 3, respectively. Plate-shaped receiving electrodes 423a to 423d extending in the front-rear direction with a predetermined width at the center of the four outer surfaces of the first protrusion 421 and the second protrusion 422 in the vertical and vertical directions, respectively. In FIG. 4, only the receiving electrodes 423c and 423d are shown) and the receiving electrodes 424a to 424d are provided so as to slightly project outward from the outer surface. The receiving electrodes 423a to 423d and the receiving electrodes 424a to 424d are provided so that the rear end side can be elastically swung around the front end side.

When the protrusion 42 of the plug 4 is inserted into the outlet 31b of the outlet 3, the first protrusion 421 of the plug 4 is inserted into the first hole 311 and the second hole 312 of the outlet 31b of the outlet 3. And the second protrusion 422 is fitted. Then, in the grooves 313a to 313d and the grooves 314a to 314d having supply electrodes 34a to 34d and 35a to 35d on the bottom surface, which are formed on the inner side surfaces of the first hole portion 311 and the second hole portion 312 of the insertion port 31, The receiving electrodes 423a to 423d and the receiving electrodes 424a to 424d, which slightly protrude outward from the outer surfaces of the first protrusion 421 and the second protrusion 422 of the insertion plug 4, enter while contacting each other. As a result, the eight supply electrodes 34a to 34d and 35a to 35d of the outlet 3 and the eight receiving electrodes 423a to 423d and 424a to 424d of the plug 4 are brought into surface contact and connected. At the same time, the second USB connector 36 on the outlet side and the first USB connector 46 on the plug side are connected. As described above, the receiving electrodes 423a to 423d and the receiving electrodes 424a to 424d are elastically deformable by sliding contact with the supply electrodes 34a to 34d and 35a to 35d.

The power line of the terminal is connected to two desired receiving electrodes of the eight receiving electrodes 423a to 423d and 424a to 424d of the plug 4, that is, two predetermined receiving electrodes corresponding to the DC voltage used by the terminal. There is. Then, the desired DC power is supplied to the terminal. At the same time, the PLC signal can be transmitted and received by USB.

According to such an outlet 3 and a plug 4, AC power and DC power can be supplied, and PLC signals can be transmitted and received by USB. Therefore, AC power-driven electrons, which are a typical source of noise, can be used. It is possible to suppress the influence of operating noise of the range, motor, etc. on the PLC signal to a low level.

(Other)
The cross-sectional shape perpendicular to the insertion direction of the insertion portion 31b of the outlet 3 and the protrusion 42 of the insertion plug 4 described above is quadrangular, but the cross-sectional shape is not limited to this, and is not limited to, for example, a columnar or polygonal columnar shape. It doesn't matter. Further, the insertion portion 31b and the protrusion 42 may have one stage or three or more stages. Further, a protrusion may be provided on the outlet side, and an insertion portion may be provided on the insertion plug side to connect the insertion plug and the outlet. Further, the supply electrode and the receiving electrode may be three or more, that is, the voltage of the DC power that can be supplied may be two or more types, and the supply electrode and the receiving electrode may be nine or more, or seven or less. May be good.

According to the PLC system according to the present invention, the PLC signal is superimposed on the power signal converted from AC power to DC power by the AC / DC power conversion device connected to the secondary side of the watt-hour meter for communication. It is possible to further reduce the noise contained in the PLC signal separated from the power signal as compared with the conventional system in which the PLC signal is superimposed on the AC power.

3 Outlet 4 Plug-in plug 5,5a-5c Branch breaker 6 AC / DC power converter 7,7a-7c 1st coupler 8 2nd coupler B Storage battery C Control unit D Distribution board H Housing (housing)
11 Lead-in power line 31 Plug-in part 32 PLC modem 33 Power converter Br Main breaker Li Limiter PL Home power line SC Solar power TF Transformer WM Electricity meter LE Lighting equipment (terminal)
Ac air conditioner (terminal)
PC personal computer (terminal)

Claims (8)

A communication (PLC) system that uses power lines used to supply power from commercial power sources.
A lead-in power line that supplies commercial power stepped down by a transformer to the house,
With the watt-hour meter connected to the lead-in power line,
An AC / DC power converter that is connected to the secondary side of the watt-hour meter and converts AC power into DC power.
A distribution board that distributes DC power supplied from the AC / DC power converter to a plurality of home power lines, and
A plurality of terminals connected to the plurality of home power lines via a PLC modem, and
With
The AC / DC power conversion device is provided in a housing including the watt hour meter inside.
A PLC system characterized in that a PLC signal is superimposed on a DC power signal to perform communication. The PLC system according to claim 1, wherein the watt-hour meter has an electric energy measurement function and a communication function. The distribution board
A main breaker to which the power line from the AC / DC power converter is connected to the primary side, and
A plurality of branch breakers connected to the secondary side of the main breaker, and
With
The PLC system according to claim 1 or 2, wherein the plurality of home power lines are connected to the secondary side of the plurality of branch breakers. A plurality of first couplers provided on the in-house power line side of each of the plurality of branch breakers to superimpose the PLC signal on the DC power signal and / or separate the PLC signal from the DC power signal.
The third aspect of claim 3, further comprising a control unit that controls the PLC by superimposing the PLC signal separated from the DC power signal by the predetermined first coupler among the plurality of first couplers on the DC power signal by the other first coupler. PLC system. Further provided on the primary side of the main breaker, it further comprises a second coupler that superimposes the PLC signal on the DC power signal and / or separates the PLC signal from the DC power signal.
The control unit superimposes the PLC signal separated from the DC power signal by the second coupler on the DC power signal by the first coupler, or superimposes the PLC signal separated from the DC power signal by the first coupler on the second coupler. The PLC system according to claim 4, wherein the PLC is controlled by superimposing the PLC on a DC power signal. The PLC system according to claim 4 or 5, wherein the control unit is provided in the housing. Has more storage batteries,
The PLC system according to any one of claims 4 to 6, wherein the control unit supplies electric power from the storage battery to the house via the plurality of branch breakers when the electric power supply from the commercial power source is stopped. The terminal has a plug for receiving power supply and has a plug.
An outlet having a plug to which the plug can be connected is provided at the end of the home power line.
The PLC system according to any one of claims 1 to 7, wherein the outlet includes a DC / AC power conversion device that converts DC power into AC power and / or a DC / DC power conversion device that converts a voltage of DC power.

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