JP2008182635A - Power line communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power line communication system in which a power line of an existing power line duct can be used as transmission line of a power line carrier communication without carrying out electric work to disconnect a cable run of the existent power line duct. <P>SOLUTION: The power line communication system includes a plurality of power line ducts 20 which have power lines 70 connected to each other through an electrical power distribution panel 10, PLC plugs 60 which are detachably connected to the respective power line ducts 20 and include power line carrier communication modems for power line carrier communication using power lines of the power line ducts 20 as transmission lines, communication plugs 40 detachably connected to the respective power line ducts 20, and blocking plugs 30 which are connected closer to the electrical power distribution panel 10 than to the PLC plugs 60 and communication plugs 40 and include blocking filters to stop PLC signals from passing to the electric power distribution panel 10. The communication plugs 40 transmit the PLC signals transmitted through the power lines 70 of the power line ducts 20 to the communication plugs 40 connected to other power line ducts 20 through a communication line 80. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power line communication system using a power line duct for transmitting power.

Patent Document 1 includes a distribution board, a duct for an electric circuit (power line duct) connected to the distribution board, a plug connected to the power line duct, and a lighting device connected to the power line duct via the plug, Equipped with a centralized monitoring panel connected to the power line duct via a plug, and a signal leakage prevention filter connected between the power line duct and the distribution panel, making it easy to relocate, upgrade, etc. lighting equipment A possible power line communication system is disclosed.
JP-A-53-084195

  However, in the power line communication system of Patent Document 1, since the signal leakage prevention filter is inserted between the distribution board and the power line duct, in order to use the power line duct as a transmission line for power line carrier communication, the power line is temporarily used. There is a problem in that it takes time since electric work is required to cut off the power supply to the duct, cut the power line connecting the power line duct and the distribution board, and insert the blocking filter.

  An object of the present invention is to provide a power line communication system in which a power line of an existing power line duct is used as a transmission line for power line carrier communication without performing electrical work such as cutting the power line of an existing power line duct.

  A power line communication system according to the present invention electrically connects a distribution board, a plurality of power line ducts including a power line to which power distributed from the distribution board is transmitted, the power line duct and a terminal device, and the terminal. The communication data transmitted from the apparatus is converted into a power line carrier communication signal and transmitted to the power line duct, the power line carrier communication signal flowing in the power line duct is received, the received power line carrier communication signal is demodulated, and the terminal device A PLC plug to be transmitted to, a communication plug detachably connected to the power line duct, a detachably connected to the power line duct, connected to the distribution board side from the PLC plug and the communication plug, and A blocking plug including a blocking filter for preventing leakage of a power line carrier communication signal to the distribution board, the communication plug And transmitting the power line communication signal flowing in the power line duct, in communication plug connected to another power line duct through a predetermined communication path.

  According to this configuration, the communication data output from the terminal device is modulated into the power line carrier communication signal by the PLC plug and transmitted to the power line duct, and the other is transmitted via the communication path by the communication plug connected to the power line duct. Is transmitted to the communication plug connected to the other power line duct, demodulated by the PLC plug connected to the other power line duct, and transmitted to the terminal device connected to the PLC plug. Here, the blocking plug, the communication plug, and the PLC plug are configured to be detachable from the power line duct. Further, the blocking plug is connected to the distribution board side of the PLC plug and the communication plug, and prevents the power line carrier communication signal from flowing to the distribution board side. Therefore, a power line communication system can be realized only by performing a simple operation such as connecting the blocking plug closer to the distribution board than the PLC plug and the communication plug, and connecting the communication plugs with a communication path. It is possible to realize a power line communication system using the power line of the existing power line duct as a transmission line for the power line carrier communication signal without performing electrical work such as cutting the power line of the existing power line duct.

  The blocking filter in the blocking plug is preferably composed of a variable capacitor.

  According to this configuration, since the blocking filter is configured by the variable capacitor, the leakage of the power line carrier communication signal to the distribution board side can be more reliably prevented by adjusting the capacity of the variable capacitor. In other words, the impedance of the power line of the power line duct varies depending on the type and number of devices connected to the power line duct, thereby varying the band of the power line carrier communication signal flowing through the power line, but the blocking plug is configured by a variable capacitor Therefore, it is possible to more reliably prevent the power line carrier communication signal from flowing through the distribution board by adjusting the capacity of the variable capacitor.

  Further, the blocking plug includes a capacitor as the blocking filter and a connection part for connecting the communication plugs in a multistage connection, and the connection part connects the capacitors included in the communication plugs connected in a multistage in parallel. It is preferable.

  According to this configuration, it is possible to adjust the number of capacitors connected in parallel by adjusting the number of capacitors connected in parallel by connecting the blocking plugs in multiple stages, and to adjust the combined capacity of the capacitors constituting the blocking plug. Leakage to the panel side can be prevented more reliably. That is, the impedance of the power line of the power line duct varies depending on the type and number of devices connected to the power line duct, and this changes the bandwidth of the power line carrier communication signal that flows through the power line, but adjusts the number of connected blocking plugs. By doing so, it can prevent more reliably that a power line carrier communication signal flows into a distribution board.

  According to the present invention, a power line communication system is realized by simply performing a simple operation of connecting a communication plug to the distribution board side of the PLC plug and the communication plug and connecting the communication plugs via a communication path. Therefore, it is possible to realize a power line communication system in which the power line of the existing power line duct is used as the transmission path for the power line carrier communication signal without performing electrical work such as cutting the power line of the existing power line duct.

  Hereinafter, a power line communication system according to an embodiment of the present invention will be described. In addition, what attached | subjected the same code | symbol in each figure represents the same thing.

(Embodiment 1)
FIG. 1A is an overall configuration diagram of the power line communication system according to the first embodiment, and FIG. 1B is a circuit diagram of the blocking plug 30. The power line communication system includes a distribution board 10, a power line duct 20, a blocking plug 30, a communication plug 40, a power plug 50, a PLC (Power Line Communications) plug 60, a communication path 80, a terminal device 100, and a lighting fixture. 200.

  The distribution board 10 is connected to a power line that transmits commercial power, and distributes the commercial power to each power line 70. The power line duct 20 includes a single-phase three-wire power line 70, and the power lines 70 are connected to each other via the distribution board 10. Hereinafter, the power line duct 20 shown on the upper side in FIG. 1A is referred to as a power line duct 21, the power line duct 20 shown on the lower side is referred to as a power line duct 22, and the power line duct is collectively referred to as a power line duct 20. Note that a three-phase three-wire power line 70 may be employed.

  FIG. 2 is an external configuration diagram of the power line duct 20, and FIG. 3 is a cross-sectional view of the power line duct 20. As shown in FIG. 2, the power line duct 20 includes a duct portion 23 having an elongated shape whose longitudinal direction is the wiring direction of the power line 70. An opening 24 whose longitudinal direction is the wiring direction of the power line 70 is formed in the lower portion of the duct portion 23, and a plug connection portion 74 for detachably connecting the blocking plug 30, the power plug 50, and the PLC plug 60 is provided. Is provided. Further, the duct portion 23 is provided with electric paths 71 and 72 constituting a power line 70 on both left and right inner walls. The electric circuit 71 flows in the L1 phase or the L2 phase, and the electric circuit 72 flows in the N phase.

  As shown in FIG. 3, a pair of holders 731 and an opening 24 are formed on both the left and right inner walls of the duct portion 23 so as to face each other toward the center of the duct portion 23. Inside the holder 731, electric paths 71 and 72 are disposed. The top of the holder 731 is open, and the terminal portions of the blocking plug 30, the communication plug 40, the power plug 50, and the PLC plug 60 are inserted, and the blocking plug 30, the communication plug 40, the power plug 50, and the PLC plug 60 are inserted. Are electrically connected to the power line duct 20.

  The blocking plug 30 is detachably connected to the power line duct 20, is connected to the distribution board 10 side of the PLC plug 60 and the communication plug 40, and a power line carrier communication signal (hereinafter referred to as “PLC”) to the distribution board 10. A blocking filter that prevents passage of the signal). Here, as the blocking filter, a capacitor C1 as shown in FIG. 1B can be employed. The capacitor C1 has a capacity capable of preventing leakage of the PLC signal frequency band (for example, 2 MHz to 30 MHz for high-speed PLC) to the distribution board 10 side.

  Further, the blocking plug 30 includes a connection portion that can be attached to an arbitrary position of the power line duct 20. 4A and 4B are views showing an external configuration of the blocking plug 30, where FIG. 4A is a top view, FIG. 4B is a cross-sectional view along line aa, and FIG. 4A to 4C, x indicates the depth direction, y indicates the width direction, and z indicates the height direction. As shown in FIGS. 4A to 4C, the blocking plug 30 includes a main body portion 32 and a connection portion 36 disposed on the upper side of the main body portion 32. The main body 32 has a substantially rectangular parallelepiped shape, and a capacitor C1 and an electric circuit for connecting the capacitor C1 to the power line 70 are disposed therein. The connecting portion 36 includes a cylindrical portion 35 having a longitudinal direction in the z direction, a pair of protruding portions 33 protruding in the y and −y direction sides on the side surface of the cylindrical portion 35, and the y and −y directions on the side surface of the cylindrical portion 35. And a pair of electrodes 34 projecting to the side. The protruding portion 33 has a flat plate shape and is integrally formed with the cylindrical portion 35. The electrode 34 is made of a member having a flat plate shape made of metal, and is electrically connected to the capacitor C1 through an electric circuit.

  When the electrode 34 and the protruding portion 33 are inserted into the opening 24 of the power line duct 20 and the blocking plug 30 is rotated 90 degrees around the z direction, the protruding portions 33 are provided on both sides of the opening 24. The electrode 34 is inserted into the holder 731, and the blocking plug 30 and the power line duct 20 are electrically connected. On the other hand, when the blocking plug 30 connected to the power line duct 20 is rotated 90 degrees around the z direction, the fitting of the protruding portion 33 is released, and the connection between the electrode 34 and the holder 731 is released, and blocking is performed. The plug 30 can be removed from the power line duct 20.

  The communication plug 40 includes a connection portion similar to that of the blocking plug 30 and is detachable at an arbitrary position on the bottom surface 24 a of the power line duct 20. A PLC signal flowing through the power line 70 of the power line duct 20 is transmitted via the communication path 80. It transmits to the communication plug 40 connected to the other power line duct 20. Here, as the communication path 80, a twisted pair cable composed of a pair of conductive wires can be employed.

  When the communication plug 40 is connected to the power line duct 20 in the same manner as the blocking plug 30, one conductor constituting the communication path 80 is connected to the electric path 71, and the other conductor is connected to the electric path 72. And the power line 70 are electrically connected.

  The power plug 50 includes a connection portion similar to that of the blocking plug 30 and is detachable at an arbitrary position on the bottom surface 24 a of the power line duct 20, and supplies power flowing through the power line 70 to the luminaire 200 connected to the power plug 50. To do.

  The PLC plug 60 includes a connection portion similar to that of the blocking plug 30, can be connected to an arbitrary position on the bottom surface 24 a of the power line duct 20, and includes a LAN input / output portion and a power line carrier communication modem. The LAN input / output unit includes a LAN terminal to which a LAN cable such as 10Base-T or 100Base-T can be connected, and is connected to the terminal device 100 via the LAN cable. The power line carrier communication modem unit converts the LAN signal received by the LAN input / output unit into a PLC signal, transmits the PLC signal to the power line 70, receives the PLC signal flowing in the power line duct 20, and converts the received PLC signal into the LAN signal. It converts and transmits to the terminal device 100.

  The terminal device 100 includes a personal computer connected to the PLC plug 60 via a LAN cable, and transmits a LAN signal conforming to the LAN communication protocol to the terminal device 100 connected to the other power line duct 20. The LAN signal transmitted from the terminal device 100 connected to the other power line duct 20 is received. The terminal device 100 may be a device other than a personal computer such as a digital camera. The lighting fixture 200 is composed of a lighting fixture such as a fluorescent lamp, a light bulb, and a light emitting diode. Note that a household electrical appliance such as a television receiver or a washing machine may be connected in place of the lighting fixture 200 in the power plug 50.

  Next, the operation of the power line communication system according to Embodiment 1 will be described. When communication data is transmitted as a LAN signal from the terminal device 100 connected to the power line duct 21, the PLC plug 60 connected to the power line duct 21 converts the transmitted LAN signal into a PLC signal and supplies the PLC signal to the power line duct 21. And send. The communication plug 40 connected to the power line duct 21 receives the PLC signal flowing through the power line duct 21, and transmits the received PLC signal to the communication plug 40 connected to the power line duct 22 via the communication line 80. 40 transmits the received PLC signal to the power line duct 22. The PLC plug 60 connected to the power line duct 22 receives the PLC signal flowing through the power line duct 22, converts the received PLC signal into a LAN signal, and transmits the LAN signal to the terminal device 100 via the LAN cable.

  Thus, according to the power line communication system according to the first embodiment, the blocking plug 30, the communication plug 40, and the PLC plug 60 are configured to be detachable from the power line duct 20. Further, the blocking plug 30 is connected to the distribution board 10 side than the PLC plug 60 and the communication plug 40, and prevents the PLC signal from flowing to the distribution board 10 side. Accordingly, the power line communication system can be obtained by simply connecting the blocking plug 30 to the distribution board 10 side of the PLC plug 60 and the communication plug 40 and connecting the communication plugs 40 via the communication path 80. It is possible to realize a power line communication system that uses the power line of the existing power line duct 20 as a PLC signal transmission line without performing electrical work such as cutting the power line 70 of the existing power line duct 20.

(Embodiment 2)
Next, a power line communication system according to the second embodiment will be described. FIG. 5A shows an overall configuration diagram of the power line communication system according to the second embodiment, and FIG. 5B shows a circuit diagram of the blocking plug 30. As shown in FIG. 5A, in the power line communication system according to the second embodiment, the blocking plug 30 is constituted by a variable capacitor C11. The variable capacitor C11 is configured by a trimmer capacitor having a dial for adjusting the capacity, and prevents the PLC signal from flowing to the distribution board 10 side. An operator such as a contractor adjusts the capacity of the variable capacitor C11 by adjusting the rotation angle of the dial so that the PLC signal does not flow to the distribution board 10 side.

  As described above, since the blocking plug 30 is configured by the variable capacitor C11, the capacity of the variable capacitor C11 can be adjusted to more reliably prevent the PLC signal from flowing to the distribution board 10 side. That is, the impedance of the power line 70 of the power line duct 20 varies depending on the type and number of devices connected to the power line duct 20, thereby varying the bandwidth of the PLC signal flowing through the power line 70. Since it is comprised by C11, it can prevent more reliably that a PLC signal flows into the distribution board 10 by adjusting the capacity | capacitance of the variable capacitor C11.

(Embodiment 3)
Next, a power line communication system according to Embodiment 3 will be described. 6A shows an overall configuration diagram of the power line communication system according to the third embodiment, and FIG. 6B shows a circuit diagram of the blocking plug 30a. FIG. 7 is a diagram showing an external configuration of the blocking plug 30a, where (a) is a cross-sectional view taken along line bb, (b) is a top view, and (c) is a front view. As shown in FIG. 7A, the blocking plug 30a has a configuration in which a connecting portion 37 is disposed at the end on the −z direction side in the blocking plug 30 shown in FIG. The connecting portion 37 is composed of a member including an opening portion 37a having a substantially U shape in the yz section, and a pair of holders 371 are formed on both inner walls on the y direction side so as to face each other. Has been. The holder 371 has the same configuration as the holder 731 shown in FIG. Therefore, when the electrode 34 and the protruding portion 33 of the other blocking plug 30a are inserted into the opening 37a of the connecting portion 37 and the blocking plug 30a is rotated 90 degrees around the z direction, the protruding portion 33 becomes the opening of the opening 37a. 6B is fitted between the bottom surface 37b provided on both sides and the holder 731, the electrode 34 is inserted into the holder 731 and the blocking plug 30a is connected to the power line duct 20, as shown in FIG. Thus, the capacitor C1 is connected in parallel with the capacitor C1 of the other blocking plug 30a.

  Thus, since the connection part 37 was arrange | positioned at the edge part of the -z direction side of the blocking plug 30a, the number of the capacitors C1 connected in parallel is adjusted by connecting the blocking plug 30a in multiple stages, and the blocking plug 30a It is possible to adjust the combined capacity of the capacitor C1 to be configured, and it is possible to more reliably prevent the PLC signal from flowing to the distribution board 10 side. That is, the impedance of the power line 70 of the power line duct 20 varies depending on the type and number of devices connected to the power line duct 20, and thus the bandwidth of the PLC signal flowing through the power line 70 varies, but the connection of the blocking plug 30 a is performed. By adjusting the number, it is possible to more reliably prevent the PLC signal from flowing into the distribution board 10.

(A) shows the whole block diagram of the power line communication system by Embodiment 1, (b) has shown the circuit diagram of the blocking plug. The external appearance block diagram of the power line duct is shown. FIG. 3 shows a partial cross-sectional view of a power line duct. It is the figure which showed the external appearance structure of the blocking plug, (a) is a top view, (b) is aa sectional drawing, (c) has shown the front view. (A) shows the whole block diagram of the power line communication system by Embodiment 2, (b) has shown the circuit diagram of the blocking plug. (A) shows the whole block diagram of the power line communication system by Embodiment 3, (b) has shown the circuit diagram of the blocking plug. It is the figure which showed the external appearance structure of the blocking plug, (a) is bb sectional drawing, (b) is a top view, (c) has shown the front view.

Explanation of symbols

10 Distribution board 20, 21, 22 Power line duct 23 Duct portion 24 Opening 24a Bottom surface 30, 30a Blocking plug 40 Communication plug 50 Power plug 60 PLC plug 70 Power line 80 Communication path 100 Terminal device 200 Lighting equipment

Claims (3)

Distribution board,
A plurality of power line ducts including a power line through which power distributed from the distribution board is transmitted;
The power line duct and the terminal device are electrically connected, the communication data transmitted from the terminal device is modulated into a power line carrier communication signal and transmitted to the power line duct, and the power line carrier communication signal flowing through the power line duct is received. A PLC plug that demodulates the received power line carrier communication signal and transmits it to the terminal device;
A communication plug detachably connected to the power line duct;
A blocking plug that is detachably connected to the power line duct, is connected to the distribution board side of the PLC plug and the communication plug, and includes a blocking filter that prevents leakage of a power line carrier communication signal to the distribution board; With
The power plug communication system, wherein the communication plug transmits a power line carrier communication signal flowing through the power line duct to a communication plug connected to another power line duct via a predetermined communication path.   The power line communication system according to claim 1, wherein the blocking filter in the blocking plug is configured by a variable capacitor. The blocking plug is
A capacitor as the blocking filter;
A connection part for connecting the communication plugs in a multi-stage,
2. The power line communication system according to claim 1, wherein the connection unit connects in parallel each capacitor included in a multistage-connected blocking plug.

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