JP2008187277A - Power line carrier communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power line carrier communication system capable of performing power line carrier communication between terminal devices connected to power line ducts connected to different distribution boards and between terminal devices wired from different electric path breakers. <P>SOLUTION: A coupler 16 is equipped with terminals T1 to T4, and has a circuit element C1 such as a capacitor between the terminals T1 and T3 and a circuit element C2 such as a capacitor between the terminals T2 and T4. The circuit elements C1 and C2 pass electric power of a frequency band of a power line carrier communication signal and cut off commercial frequency electric power and DC electric power. When the coupler 16 is fitted to terminals of the power line ducts 10 and 11, conductors 10a and 11a of first and second power line carrier communication systems 2 and 3 are connected to each other via the circuit element C1, and conductors 10a and 11b of first power line carrier communication systems 2 and 3 are connected to each other via the circuit element C2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a system for performing communication using a power line by superimposing a communication signal on the power line.

  Power lines are installed in various places such as dwellings and office buildings to supply power. In recent years, power line communication (hereinafter referred to as PLC) using this power line as a transmission line is being established. Since this PLC realizes communication between devices using an existing power line, it is possible to network devices without newly introducing and constructing a dedicated communication line.

On the other hand, Patent Document 1 discloses a distribution board in which an electric circuit breaker for a power line duct is housed, a signal leakage prevention filter installed between the power line duct and the distribution board, and an electric appliance for connecting to the power line duct. The power line duct is provided between the transmitter of the operation switch and the receiver of the centralized monitoring panel, each of which is connected to the plug. A system for performing power line carrier communication using a transmission medium as a transmission medium is disclosed.
JP-A-53-84195

  In recent years, there has been a demand for enabling power line carrier communication between terminal devices respectively connected to different power line ducts.

  However, the installed power line ducts are not necessarily wired from the same circuit breaker, even if they are the same distribution board, and are not the same as the power line ducts installed at physically close positions. However, it may be wired from another circuit breaker. Moreover, the distribution board itself to which the power line duct is connected may be different.

  Therefore, in the system in which the signal leakage prevention filter is installed between the distribution board and the power line duct as in Patent Document 1, between the terminal devices in which the connected distribution boards are connected to different power line ducts. Or, power line carrier communication cannot be performed between terminal devices connected to a power line duct wired from another circuit breaker.

  The present invention has been made in order to solve the above-described problems, and the power distribution duct connected between the terminal devices connected to different power line ducts and the power line ducts wired from another circuit breaker. It aims at providing the power line carrier communication system which can perform power line carrier communication between the connected terminal devices.

  According to the first aspect of the present invention, a power line duct having a conductor as a power line is electrically connected to the power line duct and a terminal device, and communication data transmitted from the terminal device is modulated into a power line carrier communication signal. And a PLC plug that receives the power line carrier communication signal propagating through the conductor of the power line duct, demodulates the received power line carrier communication signal, and transmits it to the terminal device. And a circuit element that cuts off commercial frequency power and DC power by passing power in the frequency band of the power line carrier communication signal between the second power line ducts, and is connected between the first and second power line ducts. And the connecting portion connects the conductors provided in the first and second power line ducts to the conductor provided in the first power line duct. When a second power line communication system for connecting conveying communicatively power line between the terminal device connected to the conductor provided in the power line duct.

  According to the present invention, the PLC plug modulates the communication data output from the terminal device into a power line carrier communication signal, transmits it to the conductor of the power line duct, and the connection portion connected to the conductor of the power line duct has a commercial frequency. A power line carrier communication signal is output to a conductor of another power line duct in a state where power and DC power are cut off.

  Then, the PLC plug connected to the other power line duct receives the power line carrier communication signal from the conductor of the other power line duct, demodulates the received power line carrier communication signal, and transmits it to the terminal device. Thus, according to the present invention, power line carrier communication is possible between terminal devices connected to different power line ducts.

  According to a second aspect of the present invention, in the power line carrier communication system according to the first aspect of the present invention, the connection portion is configured such that the circuit element is connected to a conductor in the first power line duct and a conductor in the second power line duct. And a coupler having a configuration connected in series.

  According to the present invention, the PLC plug modulates the communication data output from the terminal device into a power line carrier communication signal and transmits it to the conductor of the power line duct. The coupler connected to the conductor of the power line duct has the power line carrier. A communication signal is output to a conductor of another power line duct.

  Here, the circuit element that cuts off the commercial frequency power and the DC power by passing the power in the frequency band of the power line carrier communication signal is in series with the conductor in the first power line duct and the conductor in the second power line duct. Therefore, commercial frequency power and DC power are cut off between the connected power line ducts.

  Then, the PLC plug connected to the other power line duct receives the power line carrier communication signal from the conductor of the other power line duct, demodulates the received power line carrier communication signal, and transmits it to the terminal device. Thus, according to the present invention, power line carrier communication is possible between terminal devices connected to different power line ducts.

  According to a third aspect of the present invention, in the power line carrier communication system according to the second aspect, the power line duct includes a plurality of conductors, and each conductor and a plurality of live lines electrically connected to a commercial power source are connected. The coupler is electrically connected in a one-to-one relationship, and the coupler connects a conductor to be connected to one terminal of the circuit element to a conductor of the first power line duct that is connected to the live line. And a second change-over switch for switching a conductor to be connected to the other terminal of the circuit element in the conductor of the second power line duct connected to the live line. The switching part which has is provided.

  According to the present invention, among the phases of power supplied from the commercial power source AC, the phase of power supplied to the conductor connected to the PLC plug in the first power line duct and the PLC plug in the second power line duct are Even if the phases of power supplied to the connected conductors are different, the conductors in the first power line duct and the conductors in the second power line duct are electrically connected in such a manner that commercial frequency power and DC power are cut off. It is possible to perform power line carrier communication via conductors that are connected and connected to different power phases.

  According to a fourth aspect of the present invention, there is provided the power line communication system according to the first aspect, wherein the connecting portion has a plug that is detachably connected to the power line duct at each end of the power line cable. An inter-duct connecting plug portion is provided, and each plug in the inter-power line duct connecting plug portion includes the circuit element between the power line duct and the power line cable.

  According to this invention, the PLC plug modulates the communication data output from the terminal device into a power line carrier communication signal, transmits it to the conductor of the power line duct, and the power line duct connecting plug connected to the power line duct includes: A power line carrier communication signal is output to a conductor of another power line duct.

  Here, the power line duct connecting plug portion is provided with a circuit element between the power line duct and the power line cable that allows power in the frequency band of the power line carrier communication signal to pass therethrough and cuts off commercial frequency power and DC power. The commercial frequency power and the DC power are cut off between the connected power line ducts.

  Then, the PLC plug connected to the other power line duct receives the power line carrier communication signal from the conductor of the other power line duct, demodulates the received power line carrier communication signal, and transmits it to the terminal device. Thus, according to the present invention, power line carrier communication is possible between terminal devices connected to different power line ducts.

  According to a fifth aspect of the present invention, in the power line carrier communication system according to the first aspect, the connecting portion includes a terminator for insulating a terminal portion of the power line duct, and the terminator is the power line duct. And a circuit element unit for preventing reflection of a power line carrier communication signal, and modulating communication data transmitted from the terminal device into a power line carrier communication signal and outputting it to the conductor of the power line duct, A PLC modem unit that receives a power line carrier communication signal propagating through a conductor of a power line duct, demodulates the received power line carrier communication signal, and transmits the signal to the terminal device; Includes a LAN input / output unit for connecting to a LAN, and each terminator installed in each power line duct is connected to a hub by a LAN cable connected to the LAN input / output unit. It is intended to be connected through.

  According to the present invention, the PLC plug modulates communication data output from the terminal device into a power line carrier communication signal and transmits it to the power line duct. The terminator connected to the power line duct is connected via the LAN cable and the hub. The power line carrier communication signal is transmitted to another power line duct.

  Here, the terminator modulates the communication element transmitted to the power line carrier communication signal by the circuit element unit for preventing the reflection of the power line carrier communication signal with respect to the conductor of the power line duct, and the terminal device. It has a configuration in which a PLC modem unit that transmits to a power line duct, receives a power line carrier communication signal propagating through the power line duct, demodulates the received power line carrier communication signal, and transmits the signal to the terminal device is connected in parallel. Therefore, commercial frequency power and DC power are cut off between the connected power line ducts.

  Then, the PLC plug connected to the other power line duct receives the power line carrier communication signal from the conductor of the other power line duct, demodulates the received power line carrier communication signal, and transmits it to the terminal device. Thus, according to the present invention, power line carrier communication is possible between terminal devices connected to different power line ducts.

  According to the present invention, a power line capable of performing power line carrier communication between terminal devices connected to different power line ducts and between terminal devices connected to a power line duct wired from another circuit breaker. A carrier communication system can be realized.

  An embodiment of a power line carrier communication system according to the present invention will be described.

(First embodiment)
FIG. 1 is a diagram showing a first embodiment of a power line carrier communication system according to the present invention. The power line carrier communication system 1 shown in FIG. 1 is installed indoors, for example, in a factory, store, office, or the like. The power line carrier communication system 1 of the present embodiment is configured to include a plurality of power line carrier communication systems that are respectively distributed from a plurality of different distribution boards. In the example shown in FIG. 1, the power line carrier communication system 1 includes two systems, a first power line carrier communication system 2 distributed by the distribution board 4 and a second power line carrier communication system 3 distributed by the distribution board 5. Is configured.

  The first power line carrier communication system 2 includes a distribution board 4, an incoming line member 6, and a power line duct 10. The distribution board 4 includes two live lines and one line from a single-phase three-wire commercial power supply AC. The neutral line has been introduced. The distribution board 4 is mounted with a trunk breaker or a branch breaker (not shown), and the live wires and neutral wires are led out from the distribution board 4 as a pair of power cable lines 8 through these breakers. The commercial power supply AC may be, for example, a three-phase three-wire type.

  The power line duct 10 is installed on, for example, an indoor ceiling surface, wall surface, floor surface or the like, and incorporates a pair of conductors 10a and 10b having a long shape. The pair of power cable lines 8 are respectively inserted into the power line duct 10 by the input member 6 and connected to the conductors 10a and 10b. Accordingly, the conductors 10a and 10b function as power lines for supplying power. That is, one of the two L1 phase and L2 phase live wires is connected to the conductor 10a, and the neutral wire is connected to the conductor 10b. The power line duct 10 can be connected to a power plug 50 for supplying only power to a power device such as a lighting device and a PLC plug 12 for performing power line carrier communication.

  FIG. 2 is an external configuration diagram of the power line duct 10, and FIG. 3 is a cross-sectional view of the plug connection portion 74 provided in the power line duct 10. As shown in FIG. 2, the power line duct 10 includes a hollow case 23 having an elongated shape whose longitudinal direction is the wiring direction of the conductors 10 a and 10 b. An opening 24 extending in the wiring direction of the conductors 10a and 10b is formed in the lower portion of the case 23, and a plug connection portion 74 for detachably connecting the power plug 50 and the PLC plug 12 is formed. Further, the end portion of the case 23 has an opening shape, and serves as an incoming line member connecting portion 25 for connecting the incoming line member 6. The case 23 is provided with conductors 10a and 10b on inner walls on both the left and right sides.

  As shown in FIG. 3, the plug connection portion 74 includes a pair of holders 731 formed so as to face the center of the case 23 on the respective inner walls on the left and right sides of the case 23, and the conductors 10 a, 10b is arranged. The top portion of the holder 731 has an opening shape, and the terminal portions included in the power plug 50 and the PLC plug 12 are inserted into the opening portion, so that the power plug 50 and the PLC plug 12 and the power line duct 10 are electrically connected.

  The power plug 50 includes a terminal portion that can be connected to the plug connection portion 74 of the power line duct 10, can be connected to an arbitrary position on the bottom surface of the power line duct 10, and supplies power supplied to the power line duct 10 to a fluorescent lamp, It is supplied to lighting devices such as light bulbs and light emitting diodes, and power devices 101 such as household electric appliances such as television receivers and washing machines.

  The PLC plug 12 has a terminal portion that can be connected to the plug connection portion 74 of the power line duct 10, and includes a LAN input / output portion (not shown) and a power line carrier communication modem. The LAN input / output unit includes a LAN terminal based on a communication standard such as 10Base-T or 100Base-T, and is connected to the terminal device 100 via a LAN cable. The power line carrier communication modem modulates the LAN signal received by the LAN input / output unit into a PLC signal, outputs the PLC signal to the power lines (conductors 10a and 10b), receives the PLC signal propagating through the power line, and receives the received PLC signal. Is demodulated into a LAN signal and transmitted to the terminal device 100.

  4A and 4B are diagrams showing the terminal portions of the power plug 50 and the PLC plug 12, wherein 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 terminal portion is disposed on the upper side of the main body portion 52 of the power plug 50 and the PLC plug 12, and has a cylindrical portion 55 having a longitudinal direction in the z direction, and a cylinder. A pair of projecting portions 53 projecting in the y, −y direction side on the side surface of the portion 55 and a pair of electrodes 54 projecting in the y, −y direction side on the side surface of the cylindrical portion 55 are provided. The protruding portion 53 has a flat plate shape and is integrally formed with the cylindrical portion 55. The electrode 54 is made of a member having a flat plate shape made of metal, and is electrically connected to an electric circuit disposed in the main body 52.

  When the electrode 54 and the protrusion 53 are inserted into the opening 24 of the power line duct 10 and the power plug 50 and the PLC plug 12 are rotated 90 degrees around the z direction, the protrusions 53 are provided on both sides of the opening 24. The electrode 54 is inserted into the holder 731, and the power plug 50 and the PLC plug 12 are electrically connected to the conductors 10a and 10b of the power line duct 10 while being fitted between the formed bottom surface and the holder 731 (see FIG. 3). Connected. On the other hand, when the power plug 50 and the PLC plug 12 connected to the conductors 10a and 10b of the power line duct 10 are rotated 90 degrees around the z direction, the fitting of the protrusion 53 is released, and the electrode 54 and the holder The connection with 731 is released, and the power plug 50 and the PLC plug 12 can be removed from the power line duct 10. With the configuration as described above, the PLC plug 12 can be connected to an arbitrary position on the bottom surface of the power line duct 10.

  The terminal device 100 is a personal computer connected to the PLC plug 12 via a LAN cable, a network camera capable of image distribution, or the like. When the terminal device 100 is a personal computer, the terminal device 100 is, for example, a communication device. The data is transmitted as a LAN signal conforming to the LAN communication protocol to the terminal device 100 connected to the other power line duct 10 and the communication data transmitted from the terminal device 100 connected to the other power line duct 10 is received. To do.

  As shown in FIG. 5, the terminator 14 is installed between the terminal ends of the pair of conductors 10a and 10b, and includes a series circuit of a capacitor Cw and a resistance element Rw for preventing reflection of a power line carrier communication signal. It is configured. The terminator 14 is designed so that its impedance matches the characteristic impedance of the power line composed of the conductors 10a, 10b and the like.

  The second power line carrier communication system 3 includes a distribution board 5, an incoming line member 7, a power cable line 9, a power line duct 11, conductors 11a and 11b, a PLC plug 13, a power plug 51, and a terminator 15. The panel 5, the incoming line member 7, the power cable line 9, the power line duct 11, the conductors 11a and 11b, the PLC plug 13, the power plug 51, and the terminator 15 are the distribution board 4 and the incoming line member in the first power line carrier communication system 2. 6, the power cable line 8, the power line duct 10, the conductors 10a and 10b, the PLC plug 12, the power plug 50, and the terminator 14, respectively, the same configuration as the first power line carrier communication system 2 by these members and equipment have.

  In the power line carrier communication system 1 having the above-described configuration, the terminal device 100 connected to the first power line carrier communication system 2 and the second power line carrier communication using the coupler 16 having the following configuration. It is configured to be able to carry power line communication with the terminal device 100 connected to the system 3.

  As shown in FIG. 6A, the coupler 16 includes terminals T1 to T4, a circuit element C1 such as a capacitor between the terminals T1 and T3, and a terminal T2 and a terminal T4. For example, a circuit element C2 such as a capacitor is provided therebetween. Each of the circuit elements C1 and C2 has a function of passing power in the frequency band of the power line carrier communication signal and blocking commercial frequency power and DC power (power below the commercial frequency). In this application document, the term “DC” is used to include a frequency band smaller than the commercial frequency.

  Then, after the terminators 14 and 15 of the first and second power line carrier communication systems 2 and 3 are removed, and the coupler 16 is attached to the terminal of the power line ducts 10 and 11, the first power line carrier communication system 2 The terminals T1 and T2 of the coupler 16 are connected to terminals T5 and T6 at the ends of the conductors 10a and 10b, and the couplers are connected to terminals T7 and T8 at the ends of the conductors 11a and 11b in the second power line carrier communication system 3. Sixteen terminals T3 and T4 are connected. As a result, the conductor 10a in the first power line carrier communication system 2 and 11a in the second power line carrier communication system 3 are connected via the circuit element C1, and the conductor 10b in the first power line carrier communication system 2 and the second 11b in the power line carrier communication system 3 is connected via the circuit element C2.

  When the power line ducts 10 and 11 are connected by the coupler 16 in this way, for example, when communication data is transmitted as a LAN signal from the terminal device 100 connected to the power line duct 10 in the first power line carrier communication system 2. The PLC plug 12 to which the terminal device 100 is connected modulates the received LAN signal into a PLC signal and outputs it to the conductors 10a and 10b of the power line duct 10. The PLC signal propagating through the conductors 10a and 10b of the power line duct 10 flows to the conductors 11a and 11b of the power line duct 11 in the second power line carrier communication system 3 via the coupler 16, and is connected to the conductors 11a and 11b. The PLC plug 13 receives the PLC signal propagating through the conductors 11 a and 11 b, demodulates the PLC signal into a LAN signal, and transmits it to the terminal device 100.

  As described above, the first power line carrier communication system 2 and the second power line carrier communication system 3 are electrically connected in such a manner that the commercial frequency power and the DC power are cut off. The power line duct conductors connected to each other can be connected to transmit and receive a power line carrier communication signal (LAN signal). As a result, when, for example, a personal computer is adopted as a terminal device connected to the first power line carrier communication system 2 and a network camera is adopted as a terminal device connected to the second power line carrier communication system 3, the power line carrier communication is adopted. Thus, for example, a usage form is realized in which a personal computer receives an image from a network camera, visually recognizes an image displayed on the monitor of the personal computer, and monitors an imaging region of the network camera.

  The coupler 16 is not limited to the form in which the conductors of the power line ducts wired from the distribution boards of different systems are connected by the coupler 16, but the conductors of the power line ducts wired from the different breakers of the same distribution board. May be used in the form of connecting.

(Second Embodiment)
The present embodiment is different from the first embodiment in the structure of the power line duct and the coupler, and the other configuration is the same as that of the first embodiment, and thus the difference from the first embodiment. Only the point will be described. In addition, about the member and structure etc. which have the structure similar to 1st Embodiment, the same number is attached | subjected and demonstrated.

  FIG. 7 is a schematic cross-sectional view of the power line ducts 10 ′ and 11 ′ in the present embodiment. As shown in FIG. 7, in this embodiment, two conductors D1, D2, D3, and D4 are installed on the upper and lower stages of the power line ducts 10 ′ and 11 ′, respectively. One of the two live wires and the neutral wire are introduced into the upper stage of the power line ducts 10 ′ and 11 ′ by the incoming members 6 and 7, and are connected to the two conductors D1 and D3 located in the upper stage. The other live wire and neutral wire are introduced into the lower stage of the power line ducts 10 ′ and 11 ′ by the incoming members 6 and 7 and connected to the two conductors D2 and D4 located in the lower stage. ing.

  Moreover, it replaces with the coupler 16 in the said 1st Embodiment, and the terminal device 100 connected to the 1st power line carrier communication system 2 and 2nd power line carrier communication by coupler 16 'which has the following structures. It is configured to be able to carry power line communication with the terminal device 100 connected to the system 3. FIG. 8 is a diagram showing the configuration of the coupler 16 '.

  As shown in FIG. 8, the coupler 16 ′ includes terminals T11 to T20, a circuit element C4 such as a capacitor between the terminals T13 and T17, and a capacitor or the like between the terminals T14 and T18. The circuit element C5 is provided with a circuit element C3 such as a capacitor between the terminals T19 and T20. Each of the circuit elements C3 to C5 has a function of passing power in the frequency band of the power line carrier communication signal and blocking commercial frequency power and DC power.

  Further, a switch is formed by the terminals T11, T12, T19 and the segment 17, and the terminal connected to the terminal T19 is switched by the segment 17 between the terminal T11 and the terminal T12. Further, a switch is formed by the terminals T15, T16, T20 and the segment 18, and the terminal connected to the terminal T20 can be switched between the terminal T15 and the terminal T16 by the segment 18.

  Then, after the terminators 14 and 15 of the first and second power line carrier communication systems 2 and 3 are removed and the coupler 16 ′ is attached to the terminal of the power line ducts 10 ′ and 11 ′, the first power line carrier communication is performed. The terminals T11 and T12 are connected to the terminal terminals of the conductors D1 and D2 in the system 2, the terminals T13 and T14 are connected to the conductors D3 and D4, and the terminals D1 and D2 in the second power line carrier communication system 3 are connected. The terminals T15 and T16 are connected to the terminals, and the terminals T17 and T18 are connected to the conductors D3 and D4.

  In FIG. 8, the PLC plug 12 is connected to the conductors D1 and D3 of the power line duct 10 in the first power line carrier communication system 2, and the conductor D2 of the power line duct 11 in the second power line carrier communication system 3 is connected. Based on the fact that the PLC plug 13 is connected to D4, in the coupler 16 ′, the terminal T11 and the terminal T19 are connected by the section 17, and the terminal T16 and the terminal T20 are connected by the section 18, and the first The conductor D1 of the power line duct 10 in the power line carrier communication system 2 and the conductor D2 of the power line duct 11 in the second power line carrier communication system 3 are connected via the circuit element C3.

  As described above, in the present embodiment, among the phases of power supplied from the commercial power supply AC, the phase of power supplied to the conductor to which the PLC plug 12 in the first power line carrier communication system 2 is connected, and the second Even if the phase of the power supplied to the conductor to which the PLC plug 13 is connected in the power line carrier communication system 3 is different from that of the first power line carrier communication system 2 and the second power line carrier communication system 3, commercial frequency power and direct current The power line communication signal (LAN signal) can be transmitted and received through conductors that are electrically connected in a manner in which power is cut off and connected to different power phases.

  In the coupler 16 ', the conductor to be connected is configured to be switched only between the conductor D1 and the conductor D2, but to which conductor the phase of the supplied power is connected in the distribution boards 4 and 5 Is indefinite, one conductor may be configured to be switchable with the remaining three conductors.

(Third embodiment)
FIG. 9 is a diagram showing a third embodiment of the power line carrier communication system according to the present invention. As shown in FIG. 9, the present embodiment is different from the first embodiment in the structure for connecting the conductors of different power line ducts so that the power line carrier communication is possible, and the other configurations are the same as those in the first embodiment. Since it is the same as the embodiment, only differences from the first embodiment will be described. In addition, about the member and structure etc. which have the structure similar to 1st Embodiment, the same number is attached | subjected and demonstrated.

  The power line carrier communication system 1 according to the present embodiment employs the coupler 16 as in the first embodiment as a configuration for connecting the conductors of the power line ducts 10 and 11 wired from distribution boards of different systems. Instead of the configuration, the following inter-duct connection plug portion 20 is employed.

  The inter-duct connection plug part 20 has a configuration in which an inter-duct connection plug 17 and an inter-duct connection plug 18 are connected to both ends of the power line cable 19. The inter-duct connection plug 17 and the inter-duct connection plug 18 have the same configuration, and these plugs 17 and 18 are configured to be attachable to the power line ducts 10 and 11, respectively.

  The inter-duct connection plugs 17 and 18 include a first terminal (not shown) that can be connected to the conductors 10a, 10b, 11a, and 11b of the power line ducts 10 and 11, and a second terminal (not shown) that can connect the power line cable 19. A circuit element such as a capacitor is provided between the first terminal and the second terminal, which passes power in the frequency band of the power line carrier communication signal and cuts off commercial frequency power and DC power.

  The inter-duct connection plug 17 is attached to the power line duct 10 of the first power line carrier communication system 2, and the inter-duct connection plug 18 is attached to the power line duct 11 of the second power line carrier communication system 3. A plug portion 20 is installed between the power line ducts 10 and 11.

  In this way, the inter-duct connection plug unit 20 is installed between the power line ducts 10 and 11, so that, for example, communication data is transmitted as a LAN signal from the terminal device 100 connected to the power line duct 10 in the first power line carrier communication system 2. When transmitted, the PLC plug 12 to which the terminal device 100 is connected modulates the received LAN signal into a PLC signal and transmits the PLC signal to the conductors 10 a and 10 b of the power line duct 10. The PLC signal transmitted to the conductors 10a and 10b of the power line duct 10 flows to the conductors 11a and 11b of the power line duct 11 via the inter-duct connection plug portion 20, and the PLC plug 13 connected to the conductors 11a and 11b The PLC signal propagating through the conductors 11a and 11b is received, and the PLC signal is demodulated into a LAN signal and transmitted to the terminal device 100.

  As described above, the first power line carrier communication system 2 and the second power line carrier communication system 3 are connected in such a manner that the commercial frequency power and the DC power (including the power of the commercial frequency) are cut off. Power line carrier communication signals (LAN signals) can be transmitted and received by connecting the conductors of the power line ducts wired from the distribution board. As a result, when, for example, a personal computer is adopted as a terminal device connected to the first power line carrier communication system 2 and a network camera is adopted as a terminal device connected to the second power line carrier communication system 3, the power line carrier communication is adopted. Thus, for example, a usage form is realized in which a personal computer receives an image from a network camera, visually recognizes an image displayed on the monitor of the personal computer, and monitors an imaging region of the network camera.

(Fourth embodiment)
FIG. 10 is a diagram showing a fourth embodiment of the power line carrier communication system according to the present invention. The present embodiment is different from the first embodiment in the structure for connecting the conductors of different power line ducts so that the power line carrier communication is possible, and other configurations are the same as those in the first embodiment. Only differences from the first embodiment will be described. In addition, about the member and structure etc. which have the structure similar to 1st Embodiment, the same number is attached | subjected and demonstrated.

  The power line carrier communication system 1 of the present embodiment is not a configuration that employs the coupler 16 as in the first embodiment as a configuration for connecting conductors of power line ducts wired from distribution boards of different systems. The terminators 21 and 22 having the following configuration are employed.

  As shown in FIG. 11, in the terminator 21, in addition to the series circuit of the capacitor Cw and the resistance element Rw in the terminator 14 of the first embodiment, the power line carrier communication modem unit 21a includes conductors 10a and 10b (conductors). In contrast to this, it is configured in parallel with the series circuit. Note that the terminator 22 has the same configuration as the terminator 21, and in FIG. 11, the power line carrier communication modem units 21a and 22a are represented as "PLC modem units 21a and 22a".

  The power line carrier communication modem units 21a and 22a include a LAN input / output unit (not shown) and a power line carrier communication modem. The LAN input / output unit includes a LAN terminal based on a communication standard such as 10Base-T or 100Base-T, and is connected to a LAN cable 33 (35) as shown in FIG. The power line carrier communication modem modulates the LAN signal received by the LAN input / output unit into a PLC signal, transmits the PLC signal to the LAN cable 33 (35), and receives the PLC signal propagating through the LAN cable 33 (35). The received PLC signal is demodulated into a LAN signal and output to the conductors 10a and 10b.

  In the power line carrier communication system 1 of the present embodiment, the other end of the LAN cable 33 having one end connected to the HUB 34 at the LAN input / output unit provided in the terminator 21 of the power line duct 10 in the first power line carrier communication system 2. Is connected to the LAN input / output unit provided in the terminator 22 of the power line duct 11 in the second power line carrier communication system 3, and the other end of the LAN cable 35 having one end connected to the HUB 34 is connected.

  Thereby, for example, when communication data is transmitted as a LAN signal from the terminal device 100 connected to the power line duct 10 in the first power line carrier communication system 2, the PLC plug 12 to which the terminal device 100 is connected receives the communication data. The LAN signal is modulated into a PLC signal and transmitted to the conductors 10a and 10b of the power line duct 10. The power line carrier communication modem unit 21a of the terminator 21 receives the PLC signal transmitted to the conductors 10a and 10b of the power line duct 10, demodulates the PLC signal into a LAN signal, and outputs it to the LAN cable 33. When receiving the LAN signal through the HUB 34 and the LAN cable 35, the power line carrier communication modem unit 22a of the terminator 22 in the second power line carrier communication system 3 modulates the LAN signal into a PLC signal and conducts the conductor 11a of the power line duct 11. 11b, and the PLC plug 13 connected to the conductors 11a and 11b receives the PLC signal propagating through the conductors 11a and 11b, demodulates the PLC signal into a LAN signal, and transmits the LAN signal to the terminal device 100.

  As described above, the power line carrier communication modem units 21a and 22a, the LAN cables 33 and 35, and the HUB 34 of the terminators 12 and 22 allow only the LAN signal to pass through, so the first power line carrier communication system 2 and the second power line carrier. Communication system 3 is connected in such a manner that commercial frequency power and DC power are cut off, and power line duct conductors wired from different system distribution boards are connected to each other to transmit and receive power line carrier communication signals (LAN signals). It can be performed. As a result, when, for example, a personal computer is adopted as a terminal device connected to the first power line carrier communication system 2 and a network camera is adopted as a terminal device connected to the second power line carrier communication system 3, the power line carrier communication is adopted. Thus, for example, a usage form is realized in which a personal computer receives image distribution from a network camera, visually recognizes an image displayed on the monitor of the personal computer, and monitors the imaging region of the network camera.

1 is a diagram showing a first embodiment of a power line carrier communication system according to the present invention. It is a figure which shows the external appearance block diagram of a power line duct. It is a figure which shows sectional drawing of the plug connection part with which a power line duct is provided. It is the figure which showed the terminal part of the electric power plug 50 and the PLC plug 12, (a) is a top view, (b) is aa sectional drawing, (c) is a figure which shows a front view. It is a figure which shows the structure of the termination | terminus device in 1st Embodiment. It is a figure which shows the structure of the coupler in 1st Embodiment. It is a schematic sectional drawing of the power line duct in 2nd Embodiment. It is a figure which shows the structure of the coupler in 2nd Embodiment. It is a figure which shows 3rd Embodiment of the power line carrier communication system which concerns on this invention. It is a figure which shows 4th Embodiment of the power line carrier communication system which concerns on this invention. It is a figure which shows the structure of the termination | terminus device in 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power line carrier communication system 4, 5 Distribution board 6, 7 Inlet member 8, 9 Power cable line 10, 11 Power line duct 10a, 10b, 11a, 11b Conductor 12, 13 Plug 14, 15, 21, 22, Terminator 16 Connection 17 and 18 Duct connection plug 19 Power line cable 20 Duct connection plug part 21a and 22a Power line carrier communication modem part 23 Case 33 and 35 Cable 34 HUB
50, 51 Power plug 74 Plug connection portion 100 Terminal device 101 Power device 731 Holder AC Commercial power supply C1 to C5 Circuit elements L1, L2, N1, N2 Conductor Rw Resistance elements T1 to T8 Terminals T11 to T20 Terminals

Claims (5)

A power line duct with a conductor as a power line;
A power line that electrically connects the power line duct and the terminal device, modulates communication data transmitted from the terminal device into a power line carrier communication signal, outputs the communication data to the conductor of the power line duct, and propagates the conductor of the power line duct A PLC plug that receives a carrier communication signal, demodulates the received power line carrier communication signal, and transmits the demodulated signal to the terminal device;
A circuit element that cuts off commercial frequency power and direct current power by passing power in the frequency band of the power line carrier communication signal between different first and second power line ducts, and is mounted between the first and second power line ducts. And having a connection portion
The connection portion includes a conductor provided in the first power line duct, a terminal device connected to a conductor provided in the first power line duct, and a conductor provided in the second power line duct. A power line carrier communication system that is connected to a connected terminal device so that power line carrier communication is possible.   The said connection part is equipped with the coupler provided with the structure by which the said circuit element is connected in series with respect to the conductor in the said 1st power line duct, and the conductor in a 2nd power line duct. Power line carrier communication system. The power line duct includes a plurality of conductors, and each conductor and a plurality of live wires electrically connected to a commercial power supply are electrically connected in a one-body relationship.
The coupler includes: a first changeover switch that switches a conductor to be connected to one terminal of the circuit element in a conductor of the first power line duct that is connected to the live line; and the circuit element The switching part which has a 2nd changeover switch which switches the conductor of the object connected with the other terminal of this in the conductor of the said 2nd power line duct which has a connection relation with the said live wire, The switching part is provided. Power line carrier communication system. The connecting portion includes a power line duct connecting plug portion having a plug detachably connected to the power line duct at each end of the power line cable,
2. The power line carrier communication system according to claim 1, wherein each plug in the power line duct connecting plug portion includes the circuit element between the power line duct and a power line cable. The connecting portion includes a terminator for insulating a terminal portion of the power line duct,
The terminator modulates communication data transmitted from the terminal device into a power line carrier communication signal by modulating a circuit element unit for preventing reflection of a power line carrier communication signal with respect to a conductor of the power line duct. And a PLC modem unit that receives the power line carrier communication signal propagating through the conductor of the power line duct, demodulates the received power line carrier communication signal, and transmits the signal to the terminal device. Have
The PLC modem unit includes a LAN input / output unit for connecting to a LAN,
The power line carrier communication system according to claim 1, wherein each terminator installed in each power line duct is connected via a hub by a LAN cable connected to the LAN input / output unit.

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