JP7409855B2 - power line communication system - Google Patents

Description

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

PLC is a technology that performs data communication by superimposing a carrier wave on a power line such as AC100V or AC200V that is drawn into each home. As shown in FIG. 5, a network is constructed by connecting a PLC modem 91 to an outlet 92 installed in each room in the home. When the plug provided on the PLC modem 91 is inserted into the outlet 92, power is supplied to the PLC modem 91, and a PLC signal as a communication signal is sent out superimposed on the power signal, 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 and output to the power line by the PLC modem 91 is received by the PLC modem 91 connected to another outlet 92 through the in-house power line PL installed in the home, or It is connected to the Internet via a public line 94 such as an existing optical fiber through the power meter WM and the lead-in power line 11, via a parent PLC modem (not shown) installed on the secondary side of the outdoor transformer TF. It is transmitted to the server 96, database 97, mobile terminal 98, etc.

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

In this way, the PLC system uses the lead-in power line 11 already installed in a general household and the in-home power line PL installed in the house as a communication line, and can provide a communication line with less burden on consumers. There are advantages.

Electric power drawn into the home from the transformer TF via the lead-in power line 11 is branched into a plurality of branches at the distribution board D and supplied to the outlet 92 or various household electric devices (terminals), respectively. From the viewpoint of checking the electric capacity and ensuring the safety of indoor wiring, a limiter Li, a main breaker Br, and multiple branch breakers 5 are installed on the distribution board D, and the in-house power line PL is connected to these breakers 5. are doing. Note that 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 the main breaker Br and the branch breaker 5, in the PLC system, it is sometimes necessary to arrange a relay device or the like in a power distribution board or the like to amplify the signal voltage.

Therefore, in order to suppress the attenuation of the PLC signal, a technique has been proposed in which the PLC signal is transmitted and received while bypassing the main breaker Br and the branch breaker 5 (for example, Patent Documents 1 and 2).

Japanese Patent Application Publication No. 2015-23505 Japanese Patent Application Publication No. 2010-62887

However, even when the PLC signal is transmitted and received by bypassing the main breaker Br and the branch breaker 5, there is a problem in 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 its purpose is to further reduce the noise contained in the PLC signal separated from the power signal.

A PLC system according to the present invention that achieves the above object is a communication (PLC) system that uses a power line used for supplying power from a commercial power source, and includes a lead-in power line that supplies commercial power stepped down by a transformer into a house. , a watt-hour meter connected to the lead-in power line, an AC/DC power converter connected to the secondary side of the watt-hour meter and converting AC power into DC power, and from the AC/DC power converter The AC/DC power conversion device includes a power distribution board that distributes supplied DC power to a plurality of in-home power lines, and a plurality of terminals connected to the plurality of in-home power lines via a PLC modem, It is characterized in that it is provided in a housing that includes a power meter therein, and that communication is performed by superimposing a PLC signal on a DC power signal.

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

In the PLC system having the above configuration, the power distribution board includes 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. It is also possible to have a configuration in which the plurality of in-house power lines are connected to the secondary side of the plurality of branch breakers.

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

The PLC system having the above configuration further includes a second coupler that is provided on the primary side of the main breaker and that superimposes the PLC signal on the DC power signal and/or separates the PLC signal from the DC power signal, and the control unit The PLC signal separated from the DC power signal by the second coupler is superimposed on the DC power signal by the first coupler, or the PLC signal separated from the DC power signal by the first coupler is superimposed on the DC power signal by the second coupler. It may also be configured to control the PLC by superimposing it on a signal.

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

The PLC system having the above configuration may further include a storage battery, and the control unit may be configured to supply power from the storage battery to the house via the plurality of branch breakers when power supply from a commercial power supply 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 an end of the in-home power line, and The outlet may 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, since 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, the AC power Compared to the conventional system in which the PLC signal is superimposed on the power signal, it is possible to further reduce the noise contained in the PLC signal separated from the power signal.

In addition, if the electricity meter is a so-called smart meter that has both electricity measurement and wireless communication functions, it will be possible to connect to a communication network outside the home by using the smart meter's communication function, and the PLC signal will be converted to AC power. It is possible to communicate without overlapping, and low-noise communication is possible.

1 is a schematic circuit diagram showing an embodiment of a PLC system according to the present invention. FIG. 2 is a circuit diagram showing an example of a coupler that can be used in the present invention. FIG. 3 is a perspective view showing an example of an outlet 3 that can be used in the PLC system according to the present invention. FIG. 3 is a perspective view showing an example of an insertion plug 4 that can be used in the PLC system according to the present invention. 1 is a diagram showing a configuration example of a conventional PLC system.

Hereinafter, the PLC system according to the present invention will be explained in more detail based on 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, commercial power reduced in voltage by the transformer TF (see FIG. 5) is sent to the AC/DC power converter 6 via the power meter WM via the lead-in power line 11. Then, the AC/DC power converter 6 converts the AC power into DC power and supplies the DC power to a power 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 it is preferably a smart meter that has a communication function in addition to measuring the amount of electric energy. This is because signal communication between inside and outside the home can be performed using the communication function of the smart meter. There are currently 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. The appropriate method is selected and used.

As the AC/DC power converter 6, a conventionally known device 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 is further subjected to DC/AC conversion or DC/DC conversion in the power converter 33 of the outlet 3 to obtain 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... (sometimes collectively referred to as "branch breakers 5"). and is 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 exceeding the ampere specified in the contract with the power company flows. As the limiter Li used in the present invention, conventionally known limiters can be used. Note that the limiter Li may not be necessary depending on the electric power company.

The main breaker Br detects the current throughout the home and interrupts the circuit when the current exceeds the rated current. As the main breaker Br used in the present invention, conventionally known ones can be used.

The switch 21 normally supplies power converted from AC to DC by the AC/DC power converter 6 to each terminal device via the branch breaker 5 and also to the storage battery B. The electric power supplied to storage battery B is stored in storage battery B. Furthermore, the storage battery B is connected to the solar power generation SC, and the electric power generated by the solar power generation SC is stored in the storage battery B. On the other hand, during a power outage, the power stored in the storage battery B is supplied to the terminal device via the switching unit 21 and the branch breaker 5.

The branch breakers 5 are classified according to their uses, such as "second floor lighting fixtures" and "first floor living room outlets," and interrupt the circuit when the current used exceeds the rated current. As the branch breaker 5 used in the present invention, conventionally known ones can be used.

As shown in the circuit diagram of FIG. 1, on the primary side of the AC/DC power converter 6, there is a single wire connected to the transformer TF (see FIG. A lead-in power line 11 consisting of a total of three lines, a sex wire N and two power lines L1 and L2, is connected. Then, the AC/DC power converter 6 converts the AC power into DC power, and a connection line 12 consisting of two main lines extends from the AC/DC power converter 6 and is connected to the primary side of the limiter Li. There is. The limiter Li and main breaker Br are connected by a connection line 13. A connection line 14 extends from the limiter Li, and after passing through a switching section 21, a plurality of branch breakers 5 are connected to the connection line 14.

A home power line PL is connected to the secondary side of each branch breaker 5. The in-home power line PL is wired indoors and connected to an outlet 3 or a terminal installed at a predetermined position, respectively. The outlet 3 includes a plug-in section 31, a PLC modem 32 that superimposes and separates a power signal and a PLC signal, and a power conversion device 33. Note that the power converter 33 includes a DC/AC power converter that converts DC power to AC power and a DC/DC power converter that converts DC power to a predetermined voltage.

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

According to the PLC system of the present invention that superimposes a PLC signal on a DC power signal and separates the PLC signal from the DC power signal as described above, the PLC system of the present invention superimposes and separates the PLC signal on an AC power signal. In comparison, noise contained in the PLC signal separated from the power signal is significantly reduced, and communication accuracy is improved.

Further, from the viewpoint of suppressing 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, respectively. 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 a PLC signal on a DC power signal and/or separating a PLC signal from a DC power signal, and are composed of inductive couplers and capacitive couplers. Ru.

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 includes a coupling circuit section 71, a transmitting circuit section 72 that amplifies the PLC signal, superimposes it on a DC power signal, and sends it out, and separates the PLC signal from the DC power signal taken in through the coupling circuit section 71. It has a receiving circuit section 73. The PLC signal separated from the DC power signal by the receiving circuit section 73 is sent to the control section C, while the PLC signal sent from the control section C is superimposed with the DC power signal by the transmitting circuit section 72 and sent out.

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 onto the DC power signal. For example, in the PLC system shown in FIG. 1, when an operating signal (PLC signal) such as an on/off signal for air conditioner Ac or a set temperature signal is output from the personal computer PC, the operating signal is converted into a DC power signal by the PLC modem 32. The signals are superimposed and sent toward the branch breaker 5c through the outlet 3 and the in-home power line PL. The operating signal sent toward the branch breaker 5c is separated from the DC power signal by a first coupler 7c attached to the secondary side of the branch breaker 5c, and sent to the control section C. The control unit C superimposes the operating signal from the PC on the DC power signal using the first coupler 7b attached to the secondary side of the branch breaker 5b to which the in-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 in-home power line PL, is separated from the DC power signal by the PLC modem 32 of the outlet 3, and reaches the air conditioner Ac, where the operation of the air conditioner Ac is controlled.

In addition, when an operation signal for air conditioner Ac is sent from outside the house using the communication function of the watt-hour meter (smart meter) WM, the operation signal is sent to the AC by the PLC modem (not shown) inside the watt-hour meter WM. /The signal is superimposed on the DC power signal that has been converted from AC to DC by the DC power converter 6, and is sent to the limiter Li via the connection line 12. As shown in FIG. 1, the operating signal is separated from the DC power signal by a second coupler 8 provided on the primary side of the limiter Li and sent to the control section C. Similarly to the above, the control unit C converts the operation signal from the PC into a DC power signal using the first coupler 7b attached to the secondary side of the branch breaker 5b to which the in-home power line PL that sends power to the air conditioner Ac is connected. superimposed on The operation signal superimposed on the DC power signal passes through the in-home power line PL, is separated from the DC power signal by the PLC modem 32 of the outlet 3, and reaches the air conditioner Ac, where the operation of the air conditioner Ac is controlled.

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

Here, the AC/DC power converter 6 is provided in a housing (casing) H in which a power meter WM is housed. Thereby, when the electricity meter WM is a smart meter, it becomes possible to connect to a communication network outside the house by using the communication function of the smart meter. In particular, when the smart meter's communication method is wireless multi-hop communication method or N communication method, the PLC signal transmitted from inside the home to outside the home by the PLC modem (not shown) in the power meter WM is While being separated from the DC power signal and transmitted wirelessly, the PLC signal transmitted from outside the home to the home is superimposed on the DC power signal and sent to the home power line PL via the connection line 12. In other words, since the PLC signal communicated between inside and outside the home is not superimposed on the AC power, lower noise communication is possible compared to the conventional system in which the PLC signal is superimposed on the AC voltage signal.

(Outlet)
In recent years, many of the terminals such as in-home electrical equipment are driven by DC power, but since the conventional in-home power supply was AC power, AC power is not used inside the terminal or in the plug that extends from the terminal. The power was converted to DC power. On the other hand, in the PLC system of the present invention, since the in-home power supply is DC power, there is no need to convert AC power to DC power when using the terminal. However, even with DC power, the driving voltage varies depending on the terminal, so the outlet 3 used in the PLC system of the present invention includes a power converter 33. The power converter 33 includes a DC/AC power converter that converts DC power into AC power, and a DC/DC power converter that converts the voltage of the DC power.

In the DC/AC power converter, the AC/DC power converter 6 converts the DC voltage into 48V DC voltage and sends it to the outlet 3 into 100V or 200V AC power, and converts the AC power into a terminal that uses the AC power as driving power. It is said that it can be supplied to machines. In addition, in the DC/DC power converter, for example, the DC voltage converted to 48V DC voltage in the AC/DC power converter 6 and sent to the outlet 3 is converted to 0V, 6V, 12V, 24V, 48V, 50V, 100V, 150V. It converts into multiple DC voltages such as , and can be used selectively according to the operating voltage determined by the terminal.

FIG. 3 is 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 AC power insertion part 31a and a DC power insertion part 31b. The AC power insertion part 31a has the same shape and structure as the conventional one, so a description thereof will be omitted here.

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

Grooves 313a to 313d (only grooves 313a and 313b are shown in FIG. 3) each having a predetermined width and extending in the depth direction are formed in the center portions of the four inner surfaces of the first hole 311 in the left-right direction or the vertical direction, respectively, Supply electrodes 34a to 34d (only supply electrodes 34a and 34b are shown in FIG. 3) are formed on the bottom surface of each groove 313a to 313d.

Further, grooves 314a to 314d (only grooves 314a and 314b are shown in FIG. 3) extending in the front-rear direction with a predetermined width are formed on the four inner surfaces of the second hole 312 at the center in the left-right direction or up-down direction, respectively. , supply electrodes 35a to 35d (only supply electrodes 35a and 35b are shown in FIG. 3) are formed on the bottom surface of each groove 314a to 314d. With this structure, the insertion part 31b has eight supply electrodes 34a to 34d, 35a to 35d, and each supply electrode receives DC power such as 0V, 6V, 12V, 24V, 48V, 50V, 100V, and 150V. Supplied. In addition, 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 the low voltage be supplied to the supply electrodes 34a to 34d provided on the inner peripheral surface of the first hole.

Furthermore, a second USB connector 36 is formed in the center of the back side of the second hole 312 so as to extend toward the front, and the tip of the second USB connector 36 is connected to the first hole. It is located slightly out of reach of the back side of 311.

(plug)
FIG. 4 shows a perspective view of an example of the plug 4 according to the present invention. The plug 4 shown in FIG. 4 is provided at the tip of the power cord 40 extending from the terminal device, and can be inserted into the plug 31b of the socket 31 of the outlet 3 shown in FIG. . That is, the plug 4 includes a plug body 41 having a substantially rectangular parallelepiped shape from 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 protruding forward (in the insertion direction). have The protrusion 42 includes a first protrusion 421 in the shape of a square column that protrudes forward, and a cross-sectional shape perpendicular to the front-rear direction that protrudes forward at the center of the front surface of the first protrusion 421 is smaller than the first protrusion 421. The second protrusion 422 has a quadrangular column shape. A rectangular hole 43 is formed on the front surface of the second protrusion 422 and is recessed backward with a flange portion of a predetermined width left inside from the outer periphery. 1 connector 46 is formed to extend forward.

The first protrusion 421 and the second protrusion 422 have shapes that can be fitted into the first hole 311 and the second hole 312 of the insertion portion 31b of the outlet 3, respectively. Platy receiving electrodes 423a to 423d (423a to 423d) extending in the front-rear direction with a predetermined width are provided at the center portions in the left-right direction and the up-down direction of the four outer surfaces of the upper, lower, left, and right sides of the first protrusion 421 and the second protrusion 422, respectively. In FIG. 4, only receiving electrodes 423c and 423d are shown) and receiving electrodes 424a to 424d are provided so as to slightly protrude outward from the outer surface. The reception electrodes 423a to 423d and the reception electrodes 424a to 424d are provided so that their rear ends can elastically swing around their front ends.

When the protrusion 42 of the plug 4 is inserted into the receptacle 31b of the outlet 3, the first protrusion 421 of the plug 4 is inserted into the first hole 311 and second hole 312 of the receptacle 31b of the receptacle 3. and the second protrusion 422 is fitted. Then, grooves 313a to 313d and grooves 314a to 314d, which have supply electrodes 34a to 34d and 35a to 35d on their bottom surfaces, are formed on the inner surfaces of the first hole 311 and second hole 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 plug 4, enter while being in contact with each other. As a result, the eight supply electrodes 34a to 34d, 35a to 35d of the outlet 3 and the eight reception electrodes 423a to 423d, 424a to 424d of the plug 4 come into surface contact and are 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. Note that, as described above, the receiving electrodes 423a to 423d and the receiving electrodes 424a to 424d can be elastically deformed by sliding contact with the supply electrodes 34a to 34d and 35a to 35d.

The power line of the terminal is connected to desired two 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, desired DC power is supplied to the terminal. At the same time, it becomes possible to transmit and receive PLC signals using USB.

According to such an outlet 3 and plug 4, it is possible to supply AC power and DC power, and it is also possible to transmit and receive PLC signals via USB, so that AC power-driven electronics, which is a typical source of noise, can be used. It is possible to suppress the influence of operational noise from ranges, motors, etc. on PLC signals to a low level.

(others)
Although the cross-sectional shape perpendicular to the insertion direction of the insertion part 31b of the outlet 3 and the protrusion 42 of the plug 4 described above is square, the shape is not limited to this, and for example, the shape is cylindrical or polygonal. It doesn't matter. In addition, the insertion portion 31b and the protrusion 42 may have one stage, or may have three or more stages. Furthermore, a protrusion may be provided on the outlet side and an insertion portion may be provided on the plug side to connect the plug and the outlet. Further, the number of supply electrodes and reception electrodes 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 number of supply electrodes and reception electrodes may be nine or more or seven or less. Good too.

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 converter connected to the secondary side of the watt-hour meter and communicated. Compared to a conventional system in which a PLC signal is superimposed on AC power, it is possible to further reduce noise contained in a PLC signal separated from a power signal.

3 Outlet 4 Plug 5, 5a to 5c Branch breaker 6 AC/DC power converter 7, 7a to 7c First coupler 8 Second coupler B Storage battery C Control unit D Distribution board H Housing (casing)
11 Lead-in power line 31 Plug-in part 32 PLC modem 33 Power converter Br Main breaker Li Limiter PL In-home power line SC Solar power generation TF Transformer WM Energy meter LE Lighting equipment (terminal)
AC air conditioner (terminal)
PC Personal computer (terminal)

Claims (6)

A communication (PLC) system using a power line used for power supply from a commercial power source,
A lead-in power line that supplies commercial power that has been stepped down by a transformer into the house,
a power meter connected to the lead-in power line;
an AC/DC power conversion device that is connected to the secondary side of the watt-hour meter and converts AC power to DC power;
A main breaker connected to a primary side of a power line from the AC/DC power converter, and a plurality of branch breakers connected to a secondary side of the main breaker, and supplied from the AC/DC power converter. a power distribution board that distributes the DC power to a plurality of in-house power lines connected to the secondary sides of the plurality of branch breakers ;
a plurality of terminals connected to the plurality of home power lines via PLC modems;
a plurality of first couplers that are provided on the in-home power line side of each of the plurality of branch breakers and that superimpose a PLC signal on the DC power signal and/or separate the PLC signal from the DC power signal;
A control unit that controls the PLC by superimposing a PLC signal separated from the DC power signal by a predetermined first coupler among the plurality of first couplers onto the DC power signal by another first coupler;
Equipped with
The AC/DC power conversion device is provided in a housing that includes the watt-hour meter therein,
A PLC system characterized in that communication is performed by superimposing a PLC signal on a DC power signal. The PLC system according to claim 1, wherein the power meter has a power measurement function and a communication function. Further comprising a second coupler provided on the primary side of the main breaker, superimposing a PLC signal on the DC power signal and/or separating 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 onto the DC power signal by the first coupler, or superimposes the PLC signal separated from the DC power signal by the first coupler onto the DC power signal by the second coupler. 3. The PLC system according to claim 1, wherein the PLC is controlled by being superimposed on a DC power signal. The PLC system according to any one of claims 1 to 3, wherein the control section is provided within the housing. further includes a storage battery;
The PLC system according to any one of claims 1 to 4 , wherein the control unit causes the storage battery to supply power to the house via the plurality of branch breakers when power supply from a commercial power supply is stopped. The terminal has a plug for receiving power supply,
An outlet having a plug part to which the plug can be connected is provided at an end of the home power line,
The PLC system according to any one of claims 1 to 5 , wherein the outlet includes a DC/AC power converter that converts DC power to AC power and/or a DC/DC power converter that converts the voltage of DC power.