JP2008072607A - Wiring appliance for power line communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring appliance for power line communication (PLC) that performs excellent PLC by reducing noise while securing power supply for other equipment without occupying an existent outlet. <P>SOLUTION: A housing 1 includes a modular jack 3 to which a communication cable is connected, and a blade insertion slot 20 into which blades of electronic equipment are inserted formed on the surface thereof. The housing is arranged in a buried state while having its rear end buried in a burying hole formed at a construction surface such as a wall surface. A common mode choke coil 12 is interposed between a terminal 4 and a modem 15 for power line communication and cuts off the common mode noise of the modem 15 for power line communication. A filter circuit 13 is interposed between a tap 14 and the common mode choke coil 12 and cuts off a communication band (for example, 2 to 30 MHz) of the PLC. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power line carrier communication wiring device for performing data communication using a power line wired to a building such as an office or a house.

In recent years, a local area network (hereinafter abbreviated as “LAN”) in which a plurality of computers are connected is rapidly spreading in offices and houses. A communication cable (a so-called LAN cable) is usually used as a communication medium for connecting computers in such a LAN. However, when a new LAN is introduced into an existing office or house, the labor and cost of wiring work are required. In some cases, a radio system using radio waves is employed in consideration of the above (for example, see Patent Document 1).
JP 2005-79977 A

  Incidentally, power line transmission (Powre Line Communication, hereinafter abbreviated as “PLC”) that performs data communication using a power supply wiring (power line) has been proposed. The PLC is a device (PLC modem) that transmits a PLC communication signal having a higher frequency than the commercial frequency by superimposing it on the power waveform of the commercial frequency and separates and receives the PLC communication signal of the higher frequency from the power waveform. )is required. The PLC modem is connected to an outlet provided on the wall surface via a power cord and is connected to a communication device such as a computer via a communication cable. However, since the PLC modem occupies the outlet, it becomes necessary to use a table tap or the like in order to secure the power supply of the computer and other devices.

  Moreover, since the power line is designed on the assumption that a current of a commercial frequency of 50 Hz or 60 Hz flows, when a PLC communication signal having a high frequency flows, the PLC communication signal radiates to generate radiation noise, It affects other equipment. In particular, in recent years, relaxation of laws and regulations has been studied for the purpose of making it possible to support high-speed communication such as the Internet. Conventionally, in addition to the frequency band of 10 kHz to 450 Hz that can be used in PLC, higher frequency The use of a frequency band of 2 MHz to 30 MHz has been studied. In a high-speed PLC that performs PLC using a communication signal in the frequency band of 2 MHz to 30 MHz, radiation from the power line due to the communication signal of the PLC increases compared to a low-speed PLC that performs PLC using a communication signal in the frequency band of 10 kHz to 450 kHz. .

  Conversely, noise caused by other equipment such as equipment connected to the power line through an outlet or equipment placed near the power line may get on the power line, and countermeasures against such noise are also necessary. is there.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power line carrier communication wiring device capable of reducing the noise and satisfactorily performing PLC while suppressing a decrease in usable outlets. And

  A wiring device for power line communication according to the present invention is housed in a plug blade connected to a power line wired to a building by being plugged into an outlet, a housing from which the plug blade protrudes from the back, and the housing. A power line carrier communication modem that modulates and demodulates a signal for power line carrier communication; a communication interface that is housed in the housing and interfaces with the power line carrier communication modem and a communication device; and provided on a surface of the housing. A connector into which a communication cable for connecting a communication device and a communication interface is removably inserted; a blade receiver connected to a power line through the plug blade; and a power line carrier communication modem housed in the housing. A common mode choke interposed between the blade and the plug blade and blocking common mode noise of the power line carrier communication modem. And a filter circuit that is housed in the housing and is interposed between the common mode choke coil and the blade receiver, and cuts off a communication band of power line carrier communication, and inserts a plug blade of a power plug. A plug blade insertion port for connecting to the blade receiver is provided on the surface of the housing (claim 1).

  According to this configuration, the connector is connected to the power line via the plug blade provided on the back surface of the housing, and the communication cable can be attached to the surface of the housing, and the plug blade insertion port into which the plug blade of the electric device is inserted. Therefore, it is possible to perform power communication while suppressing a decrease in usable outlets.

  In addition, since a common mode choke coil is interposed between the power line carrier communication modem and the plug blade, the common mode noise generated in the power line carrier communication modem is prevented from flowing out to the power line through the plug blade. Thus, radiation noise can be reduced.

  In addition, since a filter circuit interposed between the common mode choke coil and the blade receiver is provided, noise generated in the electrical equipment connected through the blade receiver is affected by the power line via the blade receiver and the common mode choke coil. Inflow to the carrier communication modem is suppressed. As a result, it is possible to reduce the noise while securing the power supply of the other device and to perform the PLC satisfactorily.

  Preferably, a first switch for turning on / off power supply to the power line carrier communication modem is interposed between the common mode choke coil and the plug blade.

  According to this configuration, when the use of the power line carrier communication modem is not planned, the standby power of the power line carrier communication modem can be reduced to zero by turning off the first switch.

  Preferably, a second switch is provided in parallel with the filter circuit.

  According to this configuration, when the second switch is turned on, the blade receiver is connected to the power line carrier communication modem via the common mode choke coil without passing through the filter circuit, so that the blade holder has a power line carrier communication function. By connecting a device, power line carrier communication with the communication device can be realized.

  The filter circuit preferably cuts off common mode noise and normal mode noise.

  According to this configuration, since the filter circuit blocks common mode noise and normal mode noise, when the electric device is connected via the blade receiver, the common mode noise and normal mode noise generated in the electric device are not detected. Inflow to the power line carrier communication modem via the receiver is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the wiring apparatus for power line carrier communication which can reduce PLC and can perform PLC favorably can be provided, suppressing the reduction | decrease of the useable outlet.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, and abbreviate | omits description.

(Embodiment 1)
FIG. 1 shows an external configuration diagram of a power line carrier communication wiring device A1 according to the first embodiment, where (a) is a front view, (b) is a side view, and (c) is a top view. The power line carrier communication wiring device A1 according to the first embodiment includes a plug unit 4 including a pair of plug blades 4a and 4a connected to a power line wired inside a building by being plugged into an outlet, and a substantially box And a housing 1 in which the blades 4a and 4a protrude from the upper center of the back surface.

  The housing 1 is formed of a substantially box-shaped synthetic resin molded product, and a connector (RJ-45 modular plug) 121 attached to the tip of a communication cable (CAT5 LAN cable) 120 (see FIG. 7) is provided at the upper front portion. The insertion port 3a of the receiving-side connector (modular jack 3 of RJ-45) that is detachably connected is exposed.

  Further, a tap portion 14 including a pair of plug blade insertion ports 20 and 20 into which a plug blade of a power plug is inserted is provided at the lower front portion of the housing 1. The tap portion 14 is housed in the housing 1 and includes a pair of blade receivers 21 and 21 (see FIG. 2) that receive the plug blade inserted into the plug blade insertion port 20. A display element (light emitting diode) LD is exposed above the insertion port 3a on the front surface of the housing 1. Below the modular jack 3, a switch unit 17 described later is provided.

  In order to prevent dust and the like from entering when the connector is not inserted into the insertion port 3a, for example, an operation knob protruding forward is opened and closed by a door that is movable in the vertical direction. The insertion port 3a may be configured so as to be freely closed.

  FIG. 2 is a block diagram showing a circuit configuration of the power line carrier communication wiring device A1. 2 includes a modular jack 3, a plug unit 4, a power supply unit 5, a display circuit 11, a common mode choke coil 12, a filter circuit 13, a tap unit 14, a power line carrier communication modem 15, A communication interface 16 and a switch unit 17 are provided.

  Plug part 4 is connected to a power line wired indoors by being inserted into an outlet, and includes a pair of plug blades 4a and 4a. The tap portion 14 includes a pair of blade receivers 21 and 21, and supplies power from the power line to an electrical device in which the blades are inserted into the blade receivers 21 and 21.

  The power line carrier communication modem 15 includes at least a coupling circuit 6, a transmission / reception unit 7, and a modem 8, and modulates and demodulates a communication signal for power line carrier communication. The coupling circuit 6 includes capacitors C1 and C2 and an insulating transformer T. Capacitors C1 and C2 are capacitors that cut commercial power supply frequency (power supply component). The isolation transformer T has a primary side connected to the common mode choke coil 12 via capacitors C1 and C2, and a secondary side connected to the transmission / reception unit 7.

  The transmission / reception unit 7 is connected between the coupling circuit 6 and the modem 8 and is connected to the secondary side of the isolation transformer T so as to transmit a power line carrier communication signal to the power line (hereinafter referred to as a communication signal). Send and receive. That is, the transmission / reception unit 7 converts the communication signal output from the coupling circuit 6 into a signal form suitable for reception by the modem 8 and outputs the reception signal RX to the modem 8 as a reception signal RX, and output from the modem 8. A transmission circuit 7b that converts the transmission signal Tx into a signal form for power line carrier communication and outputs the signal to the coupling circuit 6 is provided.

  The modem 8 has a demodulation function for demodulating a data signal from a communication signal in a predetermined format transmitted by being superimposed on the power line, and a modulation function for modulating transmission data on the side of a communication device such as a computer into a communication signal in a predetermined format.

  Thus, the power line carrier communication modem 15 including at least the coupling circuit 6, the transmission / reception unit 7, and the modem 8 is configured, and a PLC communication signal having a frequency higher than the commercial frequency is superimposed on the commercial frequency power waveform and transmitted. At the same time, the communication signal of the high frequency PLC is separated from the power waveform and received.

  The communication interface 16 includes a LAN controller 9 and a control circuit 10. The LAN controller 9 performs data transmission based on a standard such as 100BASE-TX with a communication device via a communication cable connected to the modular jack 3. The control circuit 10 includes a CPU as a main component, and a security function such as filtering of data (packets) exchanged between the modem 8 and the LAN controller 9 and a display circuit 11 for informing that data transmission is in progress. It has a function of controlling and causing the display element LD included in the display circuit 11 to emit light.

  The modular jack 3 is a connector conforming to a standard such as RJ-45, and is connected to a communication device via a communication cable.

  The display circuit 11 is composed of the display element LD shown in FIG. 1 and emits information, blinks, etc. under the control of the control circuit 10 to notify information that data is currently being transmitted.

  The power source unit 5 generates a DC power source from a commercial AC power source that is fed from the power line through the plug unit 4 and the common mode choke coil 12, and transmits / receives the unit 7, modem 8, LAN controller 9, control circuit 10, and display circuit DC power is supplied to each circuit such as 11. Specifically, the power supply unit 5 includes an impedance upper circuit 5a having a high impedance with respect to a PLC frequency band (for example, 2 MHz to 30 MHz) and a power supply circuit 5b formed of an AC-DC converter.

  The common mode choke coil 12 is interposed between the plug unit 4 and the power line carrier communication modem 15 (specifically, between the switch unit 17 and the coupling circuit 6). Blocks mode noise. Thereby, the common mode noise generated in the power line carrier communication modem 15 is suppressed from flowing out to the power line, and the radiation noise is reduced.

  The filter circuit 13 is interposed between the tap portion 14 and the common mode choke coil 12, and cuts off a PLC communication band (for example, 2 MHz to 30 MHz). Thereby, it is suppressed that the noise which generate | occur | produced with the electric equipment electrically connected to the tap part 14 flows into the power line carrier communication modem 15. The filter circuit 13 has a function of blocking common mode noise and a function of blocking normal mode noise. The function of blocking the common mode noise can be realized by providing the filter circuit 13 with the common mode choke coil 12. Further, the function of blocking normal mode noise is configured by a coil, a resistor, a capacitor, and the like, and can be realized by providing the filter circuit 13 with a filter that blocks normal mode noise.

  The switch unit 17 (first switch) is connected between the common mode choke coil 12 and the plug unit 4, and includes a switch S11 connected to the line L1 and a switch S12 connected to the line L2, as shown in FIG. And a knob S13. The line L1 connects the common mode choke coil 12 and the plug portion 4. The line L2 connects the common mode choke coil 12 and the plug portion 4. As shown in FIG. 1, the knob S <b> 13 is disposed on the front surface of the housing 1 so as to be slidable in the left-right direction. For example, when the knob S13 is slid to the left, both the switches S11 and S12 are turned off. When the knob S13 is slid to the right, for example, both the switches S11 and S12 are turned on.

  When the switches S11 and S12 are turned off, the power supply from the power line to the power line carrier communication modem 15 side is cut off. When the switches S11 and S12 are turned on, the power from the power line is sent to the power line carrier communication modem 15 side. Supplied.

  By the way, the outlet to which the plug blades 4a and 4a of the power line carrier communication wiring device A1 according to the first embodiment are plugged and connected is embedded in a construction surface such as a wall as shown in FIG. The outlet 100 is desirable. The embedded outlet 100 has a fitting recess 101 that fits into the housing 1 of the power line carrier communication wiring device A1, and a plug connection portion 102 that has a pair of plug blade insertion ports 103 at the bottom of the fitting recess 101. Are arranged side by side vertically. Here, when the power line carrier communication wiring device A1 is attached to the embedded outlet 100, when the housing 1 is inserted into the fitting recess 101, the plug blade 4a is inserted into the plug blade insertion port 103 of the upper plug connection portion 102, respectively. The power line carrier communication modem 15, the power supply unit 5, and the blade receiver 21 are respectively connected to the power lines via the plug blade 4 a.

  Moreover, since the housing 1 of the power line carrier communication wiring device A1 is attached in a state of being half-embedded in the fitting recess 101 of the embedded outlet 100, the amount of protrusion from the construction surface is reduced, and the construction surface is clean. Moreover, since the peripheral surface of the housing 1 is held by the inner surface of the fitting recess 101, the shakiness of the housing 1 can be eliminated.

  In this way, by inserting the plug blade 4a into the outlet installed on the construction surface, the power line carrier communication modem 15 or the like can be connected to the power line and perform power line carrier communication, so the place where the outlet is installed If so, the housing 1 can be mounted and used at a desired location. In addition, if the plug blade of the power plug is inserted into the plug blade insertion port 20 provided on the front surface of the housing 1, the power plug is connected to the power line via the blade receiver 21 in the housing 1 to supply power to the power plug. Is possible.

  As described above, the power line carrier communication wiring device A1 of Embodiment 1 can be used because it can supply power from the power line to the power plug inserted into the blade insertion slot 20 via the blade receiver 21. Power communication can be performed while suppressing a decrease in the number of outlets.

  Further, since the common mode choke coil 12 is interposed between the power line carrier communication modem 15 and the plug unit 4, common mode noise generated in the power line carrier communication modem 15 is transmitted to the power line via the plug unit 4. Outflow is suppressed and radiation noise can be reduced.

  Further, since the filter circuit 13 provided between the common mode choke coil 12 and the tap portion 14 is provided, noise generated in the electrical equipment connected through the tap portion 14 is generated by the tap portion 14 and the common mode choke. Inflow to the power line carrier communication modem 15 via the coil 12 is suppressed, and noise can be reduced while ensuring the power supply of other devices, thereby enabling a good PLC.

  Moreover, since the common mode choke coil 12 and the filter circuit 13 are provided, it is possible to provide a power line carrier communication wiring device that is particularly suitable for a high-speed PLC.

  FIG. 4 is a diagram showing a first modification of the power line carrier communication wiring device A1 according to the first embodiment, where (a) shows a front view, (b) shows a side view, and (c). Shows a bottom view. FIG. 5 is a perspective view of the first modification shown in FIG. FIG. 6 shows a bottom view of a second modification of the power line carrier communication wiring device A1 according to the first embodiment, and FIG. 7 shows a perspective view of the second modification.

  As shown in FIGS. 4 and 5, the power line carrier communication wiring device A <b> 1 according to the first modification is provided with an insertion port 3 a of the modular jack 3 in the center of the front surface of the housing 1 and a plug on the lower surface of the housing 1. Blade insertion openings 20, 20 are provided. In the first modification, the display element LD and the switch unit 17 are provided on the front surface of the housing 1.

  In the second modified example, as shown in FIGS. 6 and 7, the insertion port 3 a of the modular jack 3 and the plug blade insertion ports 20, 20 are arranged in parallel on the lower surface of the housing 1. In the second modification, the display element LD and the switch unit 17 are provided on the lower surface of the housing. Thus, if both the plug blade insertion ports 20 and 20 or both the plug blade insertion ports 20 and 20 and the insertion port 3a of the modular jack 3 are provided on the lower surface of the housing 1, the power cord 110 and the communication cable 120 are connected to the housing. By reducing the amount of protrusion from 1 in parallel, it is possible to suppress the obstacle to walking and furniture.

(Embodiment 2)
FIG. 8 shows an external perspective view of a power line carrier communication wiring device A2 according to Embodiment 2 of the present invention. FIG. 9 shows a circuit block diagram of a power line carrier communication wiring device A2 according to the second embodiment.

  The power line carrier communication wiring device A2 according to the second embodiment holds predetermined authentication information in each power line carrier communication wiring device A2 when performing power line carrier communication via a power line wired indoors. The security is ensured by allowing the power line carrier communication only between the power line carrier communication wiring devices A2 whose authentication information matches each other. For this reason, in the power line carrier communication wiring device A2 according to the second embodiment, the authentication information is stored in the memory 10a included in the control circuit 10, and the control circuit 10 serving as the authentication unit is turned on when the switch 19 is turned on. A trigger signal for performing authentication processing is given.

  The switch 19 is constituted by a tact switch, for example, and is pushed by an operation button 19a provided on the upper right portion of the front surface of the housing 1, as shown in FIG. That is, the switch 19 is turned on when the operation button 19a is pressed by the user in the off state, and is turned off when the operation button 19a is pressed by the user in the on state. The memory 10a is composed of a rewritable nonvolatile memory, and stores in advance authentication information individually given to each power line carrier communication wiring device A2.

  When a trigger signal is input from the switch 19, the control circuit 10 reads the authentication information stored in the memory 10 a, converts the authentication information into a communication signal (transmission signal Tx) by the modem 8, and transmits the communication signal to the power line from the transmission / reception unit 7. On the other hand, the control circuit 10 of the other power line carrier communication wiring device A2 that has received the communication signal also sends the authentication information stored in the memory to the power line by the communication signal. Then, in the control circuit 10 of each power line carrier communication wiring device A2, the authentication information received by the communication signal is collated with the authentication information stored in the memory 10a. Transmission / reception of signals is permitted, and transmission / reception of communication signals is not permitted unless they match.

  As described above, according to the power line carrier communication wiring device A2 according to the second embodiment, the power line carrier communication is possible only between the power line carrier communication wiring devices A2 sharing the predetermined authentication information. Security can be ensured.

(Embodiment 3)
FIG. 10 shows an external perspective view of a power line carrier communication wiring device A3 according to the third embodiment. FIG. 11 shows a circuit block diagram of a power line carrier communication wiring device A3 according to the third embodiment. The power line carrier communication wiring device A3 according to the third embodiment is characterized in that a USB is used instead of 100BASE-TX in the first embodiment as an interface between the communication device and the modem 8.

  As shown in FIG. 10, a USB connector attached to the tip of a communication cable (USB cable) 130 (see FIG. 13) is inserted into the upper front portion of the housing 1 instead of the insertion port 3a of the modular jack 3. An insertion port 150a of a receiving side (hereinafter referred to as a USB jack) 150 of a USB connector to which a side (hereinafter referred to as a USB plug) 131 (see FIG. 13) is detachably connected is exposed. Also, as shown in FIG. 11, a USB controller 9 a for performing data transmission with a communication device in accordance with the USB standard via a communication cable (USB cable) connected to the USB jack 150 is a LAN controller 9. It is provided instead of.

  If the USB jack 150 of the power line carrier communication wiring device A3 and the USB jack of the personal computer are connected by a USB cable, the personal computer can perform power line carrier communication via the USB cable.

  FIG. 12 shows a first modification of the power line carrier communication wiring device A3 according to the third embodiment. As shown in FIG. 12, the first modification is characterized in that the insertion port 150a of the USB jack 150 is provided in the center of the front surface of the housing 1, and the plug blade insertion ports 20 and 20 are provided on the lower surface of the housing 1. Yes. The display element LD and the switch unit 17 are provided on the front surface of the housing 1.

  FIG. 13 shows a second modification of the power line carrier communication wiring device A3 according to the third embodiment. In the second modification, as shown in FIG. 13, the insertion port 150 a of the USB jack 150 and the plug blade insertion ports 20, 20 are arranged in parallel on the lower surface of the housing 1. Further, in the third embodiment, the authentication information is stored in the memory 10a included in the control circuit 10 as in the second embodiment, and the operation button provided on the upper right portion of the front surface of the housing 1 as shown in FIG. When 19a is pushed and the switch 19 is turned on, a trigger signal for causing the control circuit 10 to perform an authentication process may be given.

(Embodiment 4)
Next, a power line carrier communication wiring device A4 according to Embodiment 4 of the present invention will be described. FIG. 15 shows a block diagram of a power line carrier communication wiring device A4 according to the fourth embodiment. FIG. 16 is a diagram showing a state in which the power line carrier communication wiring device A4 is embedded in the embedded hole.

  The power line carrier communication wiring device A4 according to the fourth embodiment is characterized in that in the power line carrier communication wiring device A1 according to the first embodiment, a switch unit 18 (second switch) is connected in parallel with the filter circuit 13. To do. The switch unit 18 includes a switch S21 connected to the line L3, a switch S22 connected to the line L4, and a knob S23 shown in FIG. The line L3 branches from the line L1 at the connection point P1, and connects the connection point P1 and the feed tap portion 14. The line L4 branches off from the line L2 at the connection point P2, and connects the connection point P2 and the feed tap portion 14. Note that the configuration in which the switch unit 18 is turned on and off is the same as that of the switch unit 17, and thus the description thereof is omitted. Further, as shown in FIG. 16, the switch portion 17 is disposed below the modular jack 3, and the switch portion 18 is disposed below the tap portion 14.

  When the switches S21 and S22 are turned on, the tap portion 14 is connected to the power line carrier communication modem 15 via the common mode choke coil 12 without passing through the filter circuit 13. Therefore, by turning on the switches S21 and S22 and connecting a communication device having a power line carrier communication function to the tap unit 14, power line carrier communication with the communication device can be realized.

The external appearance block diagram of power supply carrier communication wiring instrument A1 by Embodiment 1 is shown, (a) is a side view, (b) is a front view, (c) has shown the top view. FIG. 1A shows a front view. It is a block diagram which shows the circuit structure of wiring apparatus A1 for power line carrier communication. It is the figure which showed the embedding outlet provided in the construction surface in which wiring instrument A1 for power line conveyance communication was embedded. It is the figure which showed the 1st modification of wiring apparatus A1 for power line carrier communication by Embodiment 1, (a) shows a front view, (b) shows a side view, (c) shows a bottom view. Show. The perspective view of the 1st modification shown in FIG. 4 is shown. The bottom view of the 2nd modification of wiring apparatus A1 for power line carrier communication by Embodiment 1 is shown. The perspective view of the 2nd modification of wiring apparatus A1 for power line carrier communication by Embodiment 1 is shown. The external appearance perspective view of wiring apparatus A2 for power line carrier communication by Embodiment 2 is shown. The circuit block diagram of wiring apparatus A2 for power line carrier communication by Embodiment 2 is shown. The external appearance perspective view of wiring apparatus A3 for power line carrier communication by Embodiment 3 is shown. The circuit block diagram of wiring apparatus A3 for power line carrier communication by Embodiment 3 is shown. The 1st modification of wiring apparatus A3 for power line carrier communication by Embodiment 3 is shown. The 2nd modification of wiring apparatus A3 for power line carrier communication by Embodiment 3 is shown. FIG. 10 is a diagram showing a configuration in which an operation button 19a is disposed on a housing 1 in a power line carrier communication wiring device A3 according to a third embodiment. The block diagram of wiring apparatus A4 for power line carrier communication by Embodiment 4 is shown. It is the figure which showed the state which carried out wiring arrangement | positioning of wiring apparatus A4 for power line conveyance communication in the embedding hole.

Explanation of symbols

A1, A2, A3, A4 Power line carrier communication wiring device 1 Housing 2 Mounting frame 3 Modular jack 4 Plug part 4a Plug blade 5 Power supply part 6 Coupling circuit 7 Transmission / reception part 7a Reception circuit 7b Transmission circuit 8 Modem 9 LAN controller 10 Control circuit DESCRIPTION OF SYMBOLS 11 Display circuit 12 Common mode choke coil 13 Filter circuit 14 Tap part 15 Power line carrier communication modem 16 Communication interface 17 Switch part 18 Switch part 21 Blade holder S11, S12 Switch S21, S22 Switch

Claims (4)

A plug blade connected to the power line wired to the building by plugging into an outlet,
A housing from which the plug blade protrudes from the back;
A power line carrier communication modem housed in the housing for modulating / demodulating a signal for power line carrier communication;
A communication interface housed in the housing and performing an interface between the power line carrier communication modem and a communication device;
A connector provided on a surface of the housing, into which a communication cable for connecting a communication device and a communication interface is removably inserted;
A blade receiver connected to the power line via the plug blade;
A common mode choke coil housed in the housing, interposed between the power line carrier communication modem and the plug blade, and blocking common mode noise of the power line carrier communication modem;
A filter circuit that is housed in the housing, interposed between the common mode choke coil and the blade receiver, and cuts off a communication band of power line carrier communication,
A power line carrier communication wiring device, wherein a plug blade insertion opening for inserting a plug blade of a power plug and connecting to the blade receiver is provided on the surface of the housing.   2. The power line carrier communication wiring according to claim 1, wherein a first switch for turning on / off power supply to the power line carrier communication modem is interposed between the common mode choke coil and the plug blade. 3. Instruments.   The power line carrier communication wiring device according to claim 1, wherein a second switch is provided in parallel with the filter circuit.   4. The power line carrier communication wiring device according to claim 1, wherein the filter circuit blocks common mode noise and normal mode noise. 5.

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