JP2008072576A - 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 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, if the PLC modem occupies the outlet, it becomes difficult for the computer and other devices to use the outlet, so that it is difficult to receive the power supply.

  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 it is a power communication wiring device capable of reducing the noise and satisfactorily performing PLC while securing the power supply of other devices without occupying an existing outlet. The purpose is to provide.

  A power line carrier communication wiring device according to the present invention includes a housing embedded and disposed in a manner that a rear end portion is embedded in an embedded hole provided in a construction surface, and a terminal portion provided in the housing and connected to a power line. A power line carrier communication modem that modulates and demodulates a signal for power line carrier communication from a power line connected to the terminal portion and housed in the housing, and a power line carrier communication modem and a communication device housed in the housing A communication interface for interfacing, a connector provided on the front surface of the housing, in which a communication cable for connecting a communication device and the communication interface is removably inserted, a power plug connected to the power line via the terminal portion, and a power plug A tap portion including a plug blade insertion opening into which the blade of the blade is inserted, the modem for power line communication and the terminal portion housed in the housing A common mode choke coil interposed between the common mode choke coil and the tap portion, which is housed in the housing, and is interposed between the common mode choke coil and the tap portion. A filter circuit that cuts off a communication band of power line communication, and the housing is embedded in the construction surface using a series of mounting frames that are standardized for embedded wiring devices. The plug blade insertion port is provided on the front surface (Claim 1).

  According to this configuration, the housing having the connector to which the communication cable can be attached on the front surface and housing the power line carrier communication modem and the like is embedded in the construction surface. The power supply of the equipment can be secured.

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

  In addition, since a filter circuit interposed between the common mode choke coil and the tap portion is provided, noise generated in the electrical equipment connected via the tap portion is reduced to the power line via the tap portion 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.

  In addition, since the housing is embedded in the construction surface using a series of mounting frames standardized for the embedded wiring device, the housing can be easily embedded in the construction surface. Furthermore, since the plug blade insertion port is provided on the front surface of the housing, an electric device can be connected to the power line carrier communication wiring device.

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

  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 tap unit is connected to the power line carrier communication modem via the common mode choke coil without passing through the filter circuit, so that the tap unit 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 tap portion, the common mode noise and normal mode noise generated in the electric device are tapped. Inflow to the power line carrier communication modem via the unit is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply apparatus for power line carrier communications which can reduce a noise and can perform PLC favorably can be provided, ensuring the power supply of another apparatus, without occupying the existing 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)
1 shows a power line carrier communication wiring device A1 according to Embodiment 1, FIG. 1 (a) shows a front view, and FIG. 1 (b) shows a side view. As shown in FIGS. 1 (a) and 1 (b), the power line carrier communication wiring device A1 is a substantially box embedded and disposed in such a manner that a rear end portion is embedded in an embedded hole provided in a construction surface such as a wall surface. A housing 1 and a mounting frame 2 attached to the housing 1. The mounting frame 2 is composed of a series of mounting frames (mounting frames for large-angle continuous wiring equipment standardized by JIS C 8375) that are attached to a single switch box standardized by JIS C 8336. ing. A screw insertion hole 2a through which a box mounting screw for mounting to the switch box is inserted and a screw hole 2b into which a plate screw for mounting a plate 50 to be described later is screwed are formed at each of the upper and lower portions of the mounting frame 2. Is provided.

  The housing 1 includes a box-shaped body 1a having an open front surface and a cover 1b that closes the front surface of the body 1a. The housing 1 projects from the assembly frame 2c provided on the mounting frame 2 on the side surfaces of the body 1a and the cover 1b. The body 1a and the cover 1b are joined by fitting the fitting protrusion 1c. In addition, on the front upper portion of the housing 1, a connector (RJ-45 modular plug) attached to the tip of a communication cable (CAT5 LAN cable) is removably connected. The insertion port 3a of the jack 3) is exposed. A display element (light emitting diode) LD is exposed above the insertion port 3a on the front surface of the housing 1. Furthermore, a tap portion 14 that receives a plug blade inserted into the plug blade insertion port 20 is disposed at the lower front portion of the housing 1, including a pair of plug blade insertion ports 20 and 20 into which the plug blade of the power plug is inserted. ing.

  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 terminal unit 4, a power source 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, And a communication interface 16.

  The terminal portion 4 is disposed on the back surface (rear end portion) of the housing 1 facing the front surface of the housing 1, and includes a conventionally known screwless terminal (so-called quick connection terminal), and is a power line wired indoors of the building Is connected. The tap portion 14 includes a pair of plug blade insertion ports 20 and 20, and supplies power from the power line to an electrical device in which the plug blade is inserted into the plug blade insertion ports 20 and 20.

  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.

  In this way, the power line carrier communication modem 15 is configured by the coupling circuit 6, the transmission / reception unit 7, and the modem 8, 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, a communication signal of this 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 terminal 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 terminal unit 4 and the power line carrier communication modem 15 (specifically, between the terminal unit 4 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 a common mode choke coil. 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.

  FIG. 3 shows a state in which the power line carrier communication wiring device A1 of the present embodiment is embedded in the embedded hole. The plate 50 has a plate frame (not shown) fixed to the mounting frame 2 of the power line carrying communication wiring device A1 by a plate screw, and a window hole 51a exposing the front surface of the housing 1 of the power line carrying communication wiring device A1. The decorative plate 51 is attached to the plate frame so as to cover the front surface of the plate frame. Here, an electric wire insertion port (not shown) into which a power line is inserted is provided on the rear surface of the housing 1, and the power line inserted into the housing 1 through the electric wire insertion port is connected to the terminal portion 4 to thereby perform power line carrier communication. Wiring device A1 is connected to the power line.

  As described above, the power line carrier communication wiring device A1 of Embodiment 1 does not occupy an outlet for connection with the power line because the housing 1 is connected to the power line by the terminal portion 4 on the back side of the construction surface (wall surface). Power communication. 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 can be connected to the power line via the tap portion 21 to supply power to the power plug.

  Further, since the common mode choke coil 12 is interposed between the power line carrier communication modem 15 and the terminal unit 4, common mode noise generated in the power line carrier communication modem 15 is transmitted to the power line via the terminal 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.

(Embodiment 2)
FIG. 4 shows an external configuration diagram of a power line carrier communication wiring device A2 according to Embodiment 2 of the present invention. In the power line carrier communication wiring device A2 according to the second embodiment, the modular jack 3 exposes the insertion port 3a to the front side of the housing 1 (see FIG. 4B) and the position in the housing 1 (see FIG. 4). 4 (a)). A recess is provided in the center of the front surface of the housing 1, and the movable body 30 provided with the modular jack 3 is rotatably accommodated in the recess.

  The movable body 30 is formed in a substantially triangular prism shape, the modular jack 3 is mounted with the insertion port 3a exposed on the lower surface 30a, and the display element LD is exposed on the upper surface 30b. Shaft protrusions 30e and 30f are projected in the left-right direction on the left and right side surfaces 30c and 30d of the movable body 30, and these shaft protrusions 30e and 30f are provided in bearing holes ( The movable body 30 is pivotally supported with respect to the housing 1 so as to be rotatable in the front-rear direction (arrow R1 direction). Here, torsion coil springs (not shown) are extrapolated on the shaft protrusions 30e and 30f, and the movable body 30 faces the position where the insertion port 3a is exposed to the front side of the housing 1, that is, the arrow It is elastically biased toward the + R1 direction indicated by.

  Further, a locking and fixing portion 31 that locks and fixes the movable body 30 in a state where the movable body 30 is housed in the recess is provided at the lower end of the front surface of the housing 1. That is, in a state where the movable body 30 is housed in the recess, a locking piece (not shown) of the locking fixing portion 31 is locked to the locked portion 30g provided on the movable body 30, thereby torsion coil spring. The movable body 30 can be held in the recess against the spring force (see FIG. 4A). Further, the locking and fixing portion 31 is provided so as to be freely bent with respect to the housing 1. By pressing and bending the front surface of the locking and fixing portion 31 with a finger, the locking piece and the locked portion 30 g Is released and the movable body 30 is rotated forward (in the + R1 direction indicated by the arrow) by the spring force of the torsion coil spring, and the insertion port 3a is exposed to the front side of the housing 1 (FIG. 4B). )reference).

  Then, only when the modular plug of the communication cable is connected to the modular jack 3, the movable body 30 is rotated to expose the insertion port 3a on the front side of the housing 1, and in other cases, the movable body 30 is placed in the recess. Since it can be stored, it is possible to improve the appearance of the power line carrier communication wiring device A2 when not in use.

(Embodiment 3)
Next, a power line carrier communication wiring device A3 according to Embodiment 3 of the present invention will be described. FIG. 5 shows a block diagram of a power line carrier communication wiring device A3 according to the third embodiment. FIG. 6 is a view showing a state in which the power line carrier communication wiring device A3 is embedded in the embedded hole. The power line carrier communication wiring device A3 according to the third embodiment is the same as the power line carrier communication wiring device A1 according to the first embodiment, except that the switch unit 17 (first switch) is provided between the common mode choke coil 12 and the terminal unit 4. Is connected. The switch unit 17 includes a switch S11 connected to the line L1, a switch S12 connected to the line L2, and a knob S13 shown in FIG. The line L1 connects the common mode choke coil 12 and the terminal portion 4. The line L2 connects the common mode choke coil 12 and the terminal portion 4. The knob S13 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.

  As described above, the power line carrier communication wiring device A3 according to the third embodiment includes the switch unit 17. Therefore, when the user does not plan to use the power line carrier communication modem 15, the switch unit 17 is turned off. By doing so, the standby power of the power line carrier communication modem 15 can be made zero.

(Embodiment 4)
Next, a power line carrier communication wiring device A4 according to Embodiment 4 of the present invention will be described. FIG. 7 shows a block diagram of a power line carrier communication wiring device A4 according to the fourth embodiment. A diagram showing a state where the power line carrier communication wiring device A4 is embedded in the embedded hole is the same as FIG.

  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 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 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.

  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, it is possible to realize power line carrier communication with the communication device having the power line carrier communication function.

  The power line carrier communication wiring device according to the present invention may include both the switch unit 17 shown in the third embodiment and the switch unit 18 shown in the fourth embodiment. In this case, as shown in FIG. 8, the switch unit 17 and the switch unit 18 may be provided on the front surface of the housing 1.

It is a figure which shows the external appearance structure of wiring apparatus A1 for power line carrier communication by Embodiment 1, FIG. 1 (A) shows a front view, FIG.1 (B) shows a side 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 state which carried out wiring arrangement | positioning of the power line carrier communication wiring instrument A1 in the embedding hole. The external appearance block diagram of wiring apparatus A2 for power line carrier communication by Embodiment 2 by embodiment of this invention is shown, (a) shows the state which accommodated the movable body 30 in a recess, (b) exposed the movable body 30 from the inside of a recess. Shows the state. The block diagram of wiring apparatus A3 for power line carrier communication by Embodiment 3 is shown. It is the figure which showed the state which carried out wiring arrangement | positioning of wiring apparatus A3 for power line conveyance communication in the embedding hole. The block diagram of wiring apparatus A4 for power line carrier communication by Embodiment 4 is shown. It is the figure which showed the aspect which combined Embodiment 2 and Embodiment 3. FIG.

Explanation of symbols

A1, A2, A3, A4 Power line carrier communication wiring device 1 Housing 2 Mounting frame 3 Modular jack 4 Terminal section 5 Power supply section 6 Coupling circuit 7 Transmission / reception section 7a Reception circuit 7b Transmission circuit 8 Modem 9 LAN controller 10 Control circuit 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 S11, S12 switch S21, S22 switch

Claims (4)

A housing embedded and disposed in a manner to embed a rear end in an embedded hole provided in the construction surface;
A terminal portion provided in the housing and connected to a power line;
A power line carrier communication modem that modulates and demodulates a signal for power line carrier communication from a power line housed in the housing and connected to the terminal portion;
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 the front surface of the housing, into which a communication cable for connecting a communication device and a communication interface is removably inserted;
A tap portion including a plug blade insertion port connected to a power line through the terminal portion and into which a plug blade of a power plug is inserted;
A common mode choke coil housed in the housing, interposed between the power line carrier communication modem and the terminal, 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 tap portion, and cuts off a communication band of power line carrier communication,
The housing is embedded in the construction surface using a series of mounting frames standardized for embedded wiring devices, and the plug blade insertion opening is provided in the front surface. Wiring equipment for power line communication.   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 terminal unit. 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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