JP4082443B2 - Wiring system for power line carrier communication - Google Patents

Description

  The present invention relates to a power line carrier communication wiring system 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 communication (Power 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.

  Since the power line is designed on the assumption that a commercial frequency current of 50 Hz or 60 Hz flows, when a PLC communication signal having a high frequency flows, the PLC communication signal radiates and generates radiation noise. It will affect the 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.

  Furthermore, when installing a PLC modem in a place where people frequently move, such as in a hallway or living room, a power cable that connects the PLC modem and an outlet or a communication cable that connects the PLC modem and a communication device is caught on the legs. There is a risk of it.

  The present invention has been made in view of the above circumstances, and an object of the present invention is for power line carrier communication that can satisfactorily perform PLC by reducing noise while preventing a leg from being caught on a power cable or a communication cable. It is to provide a wiring system.

  A power line carrier communication wiring system according to the present invention includes a power line carrier communication wiring device, and an embedded outlet portion embedded in a construction surface for supplying power from the power line to the power line carrier communication wiring device. A wiring system for power line, wherein the power line communication device is 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, 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 for interfacing between the power line carrier communication modem and a communication device; and A connector that is provided on the surface and that connects and disconnects a communication cable that connects a communication device and a communication interface. 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. The plug socket portion is connected to the power line through the first blade receiver into which the plug blade in the power line carrier communication wiring device is inserted, the terminal portion connected to the power line, and the plug of the electric device. A second blade receiver into which the blade is inserted, a filter circuit that cuts off a communication band of power line carrier communication, the terminal portion, the first blade receiver, and the second blade receiver through the filter circuit. And a second switch for switching between connection and connection without going through the filter circuit.

  According to this configuration, since the power supply cable is unnecessary by providing the plug blade on the housing, it is possible to prevent the leg from being caught on the power supply cable.

  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, when another PLC modem is connected to the terminal portion via a power line, and an electrical device is connected to the second blade receiver, the first blade receiver, the second blade receiver, and the terminal portion are By switching the second switch so as to be connected via the filter circuit, the noise from the electrical equipment connected to the second blade rest is blocked by the filter circuit, and this noise flows into the other PLC modem. This can be prevented. On the other hand, when performing PLC using the power line carrier communication wiring device connected to the first blade receiver, the first blade receiver, the second blade receiver, and the terminal portion are connected without passing through the filter circuit. The PLC can be realized by switching the second switch as described above.

  Preferably, a first switch for turning on / off power supply to the power line 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.

  According to the present invention, since the power supply cable is unnecessary by providing the plug blade on the housing, it is possible to prevent the leg from being caught on the power supply cable.

  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, when another PLC modem is connected to the terminal portion via a power line, and an electrical device is connected to the second blade receiver, the first blade receiver, the second blade receiver, and the terminal portion are By switching the second switch so as to be connected via the filter circuit, the noise from the electrical equipment connected to the second blade rest is blocked by the filter circuit, and this noise flows into the other PLC modem. This can be prevented. On the other hand, when performing PLC using the power line carrier communication wiring device connected to the first blade receiver, the first blade receiver, the second blade receiver, and the terminal portion are connected without passing through the filter circuit. The PLC can be realized by switching the second switch as described above.

  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)
The power line carrier communication wiring system according to Embodiment 1 of the present invention includes the power line carrier communication wiring device A1 shown in FIG. 1 and FIG. 3 embedded in the construction surface and supplying power to the power line carrier communication wiring device A1. And an embedded outlet portion B1 shown.

  1 shows an external configuration diagram of a power line carrier communication wiring device A1 of the power line carrier communication wiring system according to Embodiment 1 of the present invention, where (a) is a front view, (b) is a side view, and (c). Shows 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 made of a substantially box-shaped synthetic resin molded product, and a connector (RJ-45 modular plug) attached to the tip of a communication cable (CAT5 LAN cable) is detachably connected to the front center. The insertion port 3a of the receiving connector (RJ-45 modular jack 3) is exposed. A plurality of light emitting diodes LD are arranged in a row at the bottom of the housing 1, and a transparent or translucent transparent cover 121 that protects the plurality of light emitting diodes LD and transmits light emitted from the light emitting diodes LD is provided in the housing. 1 is provided at the lower part of the front surface of the apparatus. A display element (light emitting diode) 3e 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 shown in FIG. 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 power line carrier communication modem 15, a communication interface 16, a switch unit 17, A power supply circuit 18, a brightness sensor 19, and an illumination unit 20 are provided.

  The plug part 4 is connected to a power line wired indoors by being inserted into the embedded outlet part B1, and includes a pair of plug blades 4a and 4a.

  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 3e 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 3e shown in FIG. 1, and emits light, blinks, and the like 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 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, and 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.

  The power supply circuit 18 is composed of, for example, an AC-DC converter, and supplies DC power to the illumination unit 20 and the brightness sensor 19. The brightness sensor 19 includes a solar cell or a photoelectric conversion element, and a voltage corresponding to the intensity (brightness) of light incident through a window hole 1a (see FIG. 1C) provided on the upper surface of the housing 1. A signal (hereinafter referred to as a brightness detection signal) is output to the control circuit 10.

  The illumination unit 20 includes a plurality of light emitting diodes LD shown in FIG. 1 and a light emitting circuit (not shown) that causes the light emitting diodes LD to emit light with a DC power source supplied from the power supply circuit 18. The control circuit 10 compares the brightness detection signal output from the brightness sensor 19 with a predetermined threshold value. When the brightness detection signal is below the threshold value, the control circuit 10 causes the illumination unit 20 to emit light and detect the brightness. When the signal is equal to or greater than the threshold value, the illumination unit 20 is turned off. In other words, the control circuit 10 causes the light emitting diode LD to emit light only when the ambient brightness (illuminance) is lower (darker) than the brightness corresponding to the threshold value.

  By the way, the embedded outlet B1 into which the plug blades 4a and 4a of the power line carrier communication wiring device A1 of the present embodiment are plugged and connected is embedded in a construction surface such as a wall as shown in FIG. The The embedded outlet portion B1 has a fitting recess 101 that fits into the housing 1 of the power line carrier communication wiring device A1. On the bottom surface of the fitting recess 101, two tap portions 102 having a pair of plug blade insertion ports 103a and 103a and two tap portions 104 having a pair of plug blade insertion ports 105a and 105a are arranged side by side. ing. On the lower side of the tap portion 102, a switch portion 110 described later is disposed. The switch unit 110 includes a knob S23 that is slidable to the left and right.

  Here, when attaching the power line carrier communication wiring device A1 to the embedded outlet B1, when the housing 1 is inserted into the fitting recess 101, the plug blades 4a and 4a are inserted into the plug blade insertion ports 103a and 103a. The blade receivers 103 and 103 (see FIG. 2) are electrically connected to the power line, and power from the power line is supplied to the power line carrier communication modem 15 and the like. 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, the amount of protrusion from the construction surface is reduced and can be attached to the construction surface neatly. And since the surrounding surface of the housing 1 is hold | maintained 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 wiring device A1 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.

  As shown in FIG. 2, the embedded outlet B <b> 1 includes tap units 102 and 104, a switch unit 110 (second switch), a filter circuit 120, and a terminal unit 130.

  The tap part 102 includes a pair of blade receivers 103 and 103 (first blade receivers), for example, plug blades 4a and 4a of the power line carrier communication wiring device A1 are connected. The tap portion 104 includes a pair of blade receivers 105 and 105 (second blade receiver), and is connected to, for example, a plug blade (not shown) of a power plug included in an electric device (not shown).

  The switch unit 110 includes switches S21 and S22 and a knob S23 shown in FIG. 3, and connects the terminal unit 130 to the blade receivers 102 and 102 and the blade receivers 105 and 105 via the filter circuit, or the filter circuit. Switch whether to connect without going through.

  The switch S21 includes nodes N11, N21, and N22. The node N11 is connected to the blade receiver on the left side of the blade receiver 103 and the blade receiver on the right side of the blade receiver 105. The node N21 is connected to the terminal unit 130, and the node N22 is connected to the terminal unit 130 via the filter circuit 120.

  The switch S22 includes nodes N12, N23, and N24. The node N12 is connected to the blade receiver on the right side of the blade receiver 103 and the blade receiver on the left side of the blade receiver 105. The node N23 is connected to the terminal unit 130, and the node N24 is connected to the terminal unit 130 via the filter circuit 120.

  When the user slides the knob S23 to the left, for example, the switch S21 connects the node N11 and the node N21, and the switch S22 connects the node N12 and the node N23. Thereby, the blade receivers 103 and 105 are connected to the terminal unit 130 without passing through the filter circuit 120.

  On the other hand, when the user slides the knob S23 to the right side, for example, the switch S21 connects the node N11 and the node N22, and the switch S22 connects the node N12 and the node N24. Thereby, the blade receivers 103 and 105 are connected to the terminal unit 130 via the filter circuit 120.

  The filter circuit 120 blocks a PLC communication band (for example, 2 MHz to 30 MHz). As a result, it is possible to suppress the noise generated in the tap unit 104 or the electric device electrically connected to the tap unit 102 from flowing out to the power line via the terminal unit 130, and other communication connected via the power line. It is possible to suppress the noise generated by the electric device connected to the tap unit 104 or the tap unit 102 from flowing into the device.

  The filter circuit 120 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 120 with a common mode choke coil. The function of blocking normal mode noise can be realized by providing the filter circuit 120 with a filter configured of a coil, a resistor, a capacitor, and the like and blocking normal mode noise.

  As described above, in the power line carrier communication wiring device A1 of the power line carrier communication wiring system of the first embodiment, the power cable is unnecessary because the housing 1 is provided with the plug blade 4a. In addition, since the illumination unit 20 illuminates the periphery of the housing 1, it is possible to prevent the legs from being caught on the communication cable connected to the modular jack 3 even in a dark environment such as at night.

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

  Further, when another PLC communication device is connected to the terminal unit 130 via a power line, and an electrical device is connected to the blade receiver 103 or the blade receiver 105, the blade receiver 103, the blade receiver 104, and the terminal unit 130. By switching the switch unit 110 so as to be connected via the filter circuit 120, noise from the electric device connected to the blade receiver 103 is blocked by the filter circuit 120, and this noise is communicated with other PLC communication devices. Can be prevented.

  On the other hand, when power line carrier communication is performed using the power line carrier communication wiring device A1, the switch unit 110 is switched so that the blade receiver 103, the blade receiver 105, and the terminal unit 130 are connected without passing through the filter circuit 120. Thus, power line carrier communication can be realized.

(Embodiment 2)
FIG. 4 shows an external perspective view of a power line carrier communication wiring device A2 of the power line carrier communication wiring system according to the second embodiment. FIG. 5 shows a circuit block diagram of the power line carrier communication wiring system according to the second embodiment. In the power line carrier communication wiring system according to the second embodiment, the power line carrier communication wiring device A2 uses the USB controller 9a as an interface between the communication device and the modem 8 instead of the LAN controller 9 in the first embodiment. It is a feature.

  As shown in FIG. 4, in the center of the front surface of the housing 1, in place of the insertion port 3a of the modular jack 3, the insertion side of the USB connector attached to the tip of the communication cable (USB cable) (hereinafter referred to as USB plug) The insertion port 150a of the receiving side (hereinafter referred to as a USB jack) 150 of the USB connector to which the connector is detachably connected is exposed. Further, as shown in FIG. 5, a USB controller 9 a for performing data transmission with a communication device via a communication cable (USB cable) connected to the USB jack 150 in accordance with the USB standard is a LAN controller 9. It is provided instead of.

  If the USB jack 150 of the power line carrier communication wiring device A2 of Embodiment 2 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.

The external appearance block diagram of power line carrier communication wiring apparatus A1 of the power line carrier communication wiring system by Embodiment 1 of this invention is shown, (a) is a front view, (b) is a side view, (c) is a top view. Show. It is a block diagram which shows the circuit structure of wiring apparatus A1 for power line carrier communication shown in FIG. It is a figure which shows the external appearance block diagram of embedding outlet part B1 of the wiring system for power line carrier communications by Embodiment 1 of this invention. The external appearance perspective view of power line carrier communication wiring apparatus A2 of the power line carrier communication wiring system by Embodiment 2 is shown. The circuit block diagram of the power line carrier communication wiring system by Embodiment 2 is shown.

Explanation of symbols

A1, A2 Wiring device for power line communication B1 Embedded outlet part 1 Housing 3 Modular jack 4 Plug part 4a Plug blade 5 Power supply part 6 Coupling circuit 7 Transmission / reception part 8 Modem 9 LAN controller 9a USB controller 10 Control circuit 11 Display circuit 12 Common Mode choke coil 13 Filter circuit 15 Power line carrier communication modem 16 Communication interface 17 Switch unit 18 Power supply circuit 19 Brightness sensor 20 Illumination unit 101 Fitting recess 102, 104 Tap unit 103a, 105a Plug blade insertion port 110 Switch unit 120 Filter Circuit 130 Terminal 150 USB Jack LD Light Emitting Diode

Claims (2)

A power line carrier communication wiring system comprising: a power line carrier communication wiring device; and an embedded outlet portion that is embedded in a construction surface and supplies power from the power line to the power line carrier communication wiring device,
The power line carrier communication wiring device,
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 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;
The embedded outlet portion is
A first blade receiver into which a plug blade in the power line carrier communication wiring device is inserted;
A terminal connected to the power line;
A second blade receiver connected to a power line via the terminal portion and into which a plug blade of an electrical device is inserted;
A filter circuit that cuts off the communication band of power line carrier communication;
A second switch for switching whether the terminal portion and the first blade holder and the second blade holder are connected via the filter circuit or not via the filter circuit; Power line carrier communication wiring system characterized by   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. system.

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