JP2008141521A - Communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication device capable of reducing branch loss by preventing crosstalk when performing power line carrier communication using indoor wirings, and to provide a unit cable used for the indoor wirings. <P>SOLUTION: The communication device 1 includes a signal transmitting filter section 12f and blocking filter sections 10a and 10b, wherein communication signals can be transmitted between communication terminal devices 60 and 61 not through an electrical distribution panel 101. The signal transmitting filter section 12f is disposed between a (first) communication wiring 11a connected to a branch line 20 for a main power source connecting with the electric distribution panel 101 and a (second) communication wiring 11b connected to a branch line 30 for the main power source. The blocking filter sections 10a and 10b are disposed for the branch lines 20 and 30 for the main power source. The wirings 11a and 11b connected through the filter section 12f are both used as signal transmission lines to enable the communication terminal devices 60 and 61 to communicate with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication device that is used to perform power line carrier communication using an indoor wiring as a signal transmission path, and a unit cable that is used for a power supply path and a signal transmission path by constructing the indoor wiring. . In particular, the present invention relates to a communication device that can prevent crosstalk.

  In recent years, power line communication (PLC) that performs high-speed communication by superimposing high-frequency signals on indoor wiring that is distributed in the house (inside the house) and used for the power supply path has been studied (Patent Literature). 1 and 2). As shown in FIG. 3, a lead-in wire 200 connected to the low-voltage distribution line is introduced into the distribution board 101 in the house 100. A plurality of branch trunk lines 102 to 104 are branched from the main line of the distribution board 101 connected to the service line 200, and a plurality of branch lines are further branched from the branch trunk lines 102 to 104. Indoor wiring is constructed from these branch trunk lines 102 to 104 and branch lines. At the end of each branch line, an electrical device such as a lighting fixture is connected, or an outlet to which various electrical devices can be connected is provided.

  In such a house 100, power line carrier communication devices (PLC modems) 110 and 111 are connected to the branch lines of the branch trunk lines 102 and 103, and communication terminal devices 120 and 121 such as personal computers are connected to the PLC modems 110 and 111, respectively. At this time, the communication terminal apparatuses 120 and 121 are connected via the branch lines, the branch trunk lines 102 and 103, and the distribution board 101, and can perform in-home PLC using these as signal transmission paths.

  The indoor wiring shown in FIG. 3 is an arrangement form called a bus type having a plurality of branch points with respect to the main line (branch trunk line). On the other hand, in recent years, using a cable called a unit cable, building indoor wiring of a star arrangement in which a plurality of branch lines are connected to one branch point has been performed.

Unit cable U as shown in FIG. 4, electrically connected to a plurality of branch lines (wiring cable) u _1, u _2, and ... u _n, these branch lines u _1, u _2, one end of ... u _n And a resin mold part (cap) M covering the branch connection part S. The unit cable is manufactured in advance in a factory, transported to each house, and wired. Specifically, the mold part M is fixed to a pillar of a house, and one of a plurality of branch lines is connected to a distribution board (hereinafter, this branch line is referred to as a main power supply branch line), and the remaining An outlet or the like is provided at the other end of the branch line (hereinafter referred to as a branch line for wiring).

JP 2006-166016 A Japanese Unexamined Patent Publication No. 2006-115481

  In a conventional home PLC, communication signals are transmitted via a distribution board. For this reason, a communication signal is transmitted from the distribution board of the house that performs the home PLC to the low-voltage distribution line via the lead-in line, and the communication signal is transmitted to another house in the vicinity of the house, or vice versa. Therefore, so-called crosstalk occurs in which communication signals and external noise propagate to the house.

  Crosstalk can be prevented by attaching a filter circuit having high impedance in the frequency band of communication signals and low impedance in the commercial frequency band to the main line of the distribution board as in the system of Patent Document 2. Further, when a filter circuit is attached to the main line, only one filter circuit is required. However, when installing the filter circuit, the main line of the distribution board may be damaged. If this main line is damaged, not only communication but also power supply cannot be performed. In addition, since the work of attaching the filter circuit to the main line involves almost all blackouts, it is not preferable today because there are many home appliances that are always operating in the house. Furthermore, even if a filter circuit is provided on the main line, in the form of performing communication via the distribution board, a so-called branch loss occurs in which a communication signal flows through a branch main line or branch line that is not used for communication. There is a possibility that good communication cannot be performed between the branch lines to be used.

  Therefore, a main object of the present invention is to provide a communication apparatus that can prevent crosstalk and reduce branch loss when performing in-home PLC. Another object of the present invention is to provide a unit cable that can contribute to the realization of good communication by preventing crosstalk when performing in-home PLC.

  In the bus-type indoor wiring as shown in FIG. 3, the present inventors, for example, a filter circuit that attenuates a communication signal to the distribution board side of each branch line used for power line carrier communication (hereinafter referred to as PLC) In these branch lines, a configuration in which the communication terminal devices are connected to each other by a communication-dedicated wiring separately from the mounting position of the filter circuit was studied. Since communication can be performed without using a distribution board by using the connected wiring and the branch line connected by this wiring as a signal transmission path, crosstalk can be prevented. Moreover, the main line of the distribution board is not damaged, and no power failure occurs. However, when connecting the above wiring to the branch line, there is a risk that the branch line may be damaged by pulling the branch line or the branch part may be damaged by vibration during the operation when the branch line is further branched. .

  Therefore, the present inventors studied a configuration in which star-type indoor wiring using a unit cable as shown in FIG. 4 is used for a signal transmission path of a PLC. And, instead of using a main power branch line belonging to a different unit cable as a signal transmission path via a distribution board, connect any one branch line belonging to each unit cable and connect these branch lines. Used as a bypass path for communication signals. That is, communication is performed using the connected wiring branch line and another wiring branch line belonging to each unit cable as a signal transmission path. Further, by providing a filter circuit in the main power branch line of each unit cable, crosstalk can be prevented, and no power failure occurs during installation work. Further, since no communication signal is transmitted through the distribution board, branch loss can be reduced.

  However, by connecting the branch lines for wiring, both branch lines are short-circuited in the commercial frequency band. Therefore, it is necessary to provide a short-circuit prevention filter such as a capacitor in order to prevent a short circuit. Therefore, if the wiring branch line used as the bypass path is configured to be connectable to the short-circuit prevention filter, the branch line or the like is not damaged during the filter mounting operation. By using any one branch line belonging to the unit cable as a dedicated communication line (communication line) in this way, crosstalk can be prevented and branch loss can be reduced. Can also be prevented. Based on such knowledge, the communication device of the present invention is configured to include a short-circuit prevention filter to which the communication wiring is connected and a filter circuit disposed on the main power supply branch line. In addition, the unit cable of the present invention has at least one branch line for wiring dedicated to communication, has a terminal portion to which a short-circuit prevention filter is connected at the end of the branch line, and a filter circuit in the branch line for main power supply It is set as the structure which comprises.

  Specifically, the communication device of the present invention includes a first communication terminal device connected to the distribution board via the first power supply path, and a first communication terminal device connected to the same distribution board via the second power supply path. This is for performing power line carrier communication with two communication terminal devices. The communication device includes a signal transmission filter unit disposed between a first communication line connected to the first power supply path and a second communication line connected to the second power supply path, And two blocking filter portions. The signal transmission filter unit attenuates power in the commercial frequency band when communication is performed between the two communication terminal devices. The first blocking filter unit prevents a communication signal from being transmitted from the first communication wiring to the distribution board side of the first power supply path, and the second blocking filter unit includes the second blocking filter unit. A communication signal is prevented from being transmitted from the communication wiring to the distribution board side of the second power supply path.

  The unit cable of the present invention includes a main power supply branch line connected to the distribution board, a plurality of wiring branch lines used for indoor wiring, and a branch connection portion for connecting all the branch lines. In particular, this unit cable has a filter connecting portion in which a signal transmission filter portion is connected to an end portion of any one of the plurality of wiring branch wires (hereinafter referred to as this wiring branch wire). Is called a communication wiring), and the main power branch line has a blocking filter portion. The signal transmission filter unit is connected to the same distribution board by connecting the first communication terminal device to a wiring branch line other than the communication wiring having the filter connection part among the plurality of wiring branch lines. When the second communication terminal device is connected to another wiring branch line other than the communication wiring in another unit cable having a main power supply branch line, and power line carrier communication is performed between the two communication terminal devices, It is interposed between both communication wires and attenuates the power in the commercial frequency band. The blocking filter section prevents a communication signal from being transmitted from the communication wiring to the distribution board side of the main power supply branch line.

  The communication device of the present invention does not transmit a communication signal via the distribution board, but connects the first communication wiring and the second communication wiring at a high frequency by the signal transmission filter unit, and transmits these signals. Used on the road. Further, the communication device of the present invention includes a blocking filter unit so that a communication signal is not transmitted to the distribution board side. By using such a communication apparatus of the present invention, crosstalk can be prevented and branch loss can be reduced as compared with the case where communication is performed via a distribution board. Therefore, when performing in-home PLC using the communication apparatus of the present invention, good communication can be performed.

  The unit cable of the present invention uses any one of the plurality of wiring branch lines (communication wiring) mainly for communication-dedicated wiring (communication signal transmission path), and at the end thereof. A filter connecting portion for connecting the signal transmission filter portion is provided, and a blocking filter portion is provided on the main power supply branch line. When there are a plurality of such unit cables, the signal transmission filter unit is connected to the filter connection unit of the communication wiring belonging to each unit cable, and the communication wirings are connected to each other via the signal transmission filter unit. When power line carrier communication is performed using a wiring for a signal transmission path, crosstalk can be prevented and branch loss can be reduced. In addition, by using such a unit cable, it is not necessary to directly connect the branch lines in the house, and damage to the indoor wiring due to this connection can be prevented.

Hereinafter, the present invention will be described in more detail.
The first power supply path and the second power supply path constitute a part of the indoor wiring arranged in the house. Each power supply path can be configured with continuous wiring, but wiring from the connection point to the distribution board described later to the distribution board side and wiring from the connection point to the communication terminal device side are separated. It can be configured by wiring. Specifically, each power supply path includes a main power supply branch line connected to a distribution board (main line), at least one branch line for wiring arranged in each room in the house, and the like. A unit cable having a branch connection portion for connecting one end of the power supply branch line and one end of each wiring branch line can be suitably used. More specifically, the distribution board side wiring is the main power supply branch line, the terminal device side wiring is the wiring branch line, and the connection point is the branch connection portion.

  The first communication line and the second communication line are connected to the first power supply path and the second power supply path, respectively, and function as a bypass path for transmitting a communication signal between the communication terminal devices. Such communication wiring is connected to the power supply path and is applied with power in the commercial frequency band, so that it can withstand this power and can transmit a desired communication signal. it can. For example, the communication wiring can be a wiring widely used for supplying power in a commercial frequency band, specifically, a parallel two-wire (a flat cable or a parallel two-core cable) without a shielding layer. The parallel two wires are also used as branch lines for wiring the unit cable. When parallel two wires having a shielding layer are used as communication wires, they are less susceptible to noise caused by induction.

  The first (second) communication wiring is connected to the branch connection portion of the unit cable constituting the first (second) power supply path. That is, the communication wiring is one wiring belonging to the unit cable. In the unit cable of the present invention, any one branch line for wiring is used as communication wiring. By making the communication wiring belong to the unit cable, it is not necessary to connect each power supply path and each communication wiring in the house, and this connection work does not damage other branch lines.

  As described above, one end of each communication wiring is connected to each power supply path, and the other end is connected to a signal transmission filter section described later. Therefore, the communication wiring is configured to be detachable from the signal transmission filter unit. Specifically, a filter connection portion to which the signal transmission filter portion is connected is provided at the end of the communication wiring. An example of the filter connection part is a terminal part.

  When the first communication line and the second communication line are connected, the first power supply path and the second power supply path are electrically connected to each other. That is, these power supply paths are short-circuited in a commercial frequency band (for example, 50 Hz or 60 Hz). Therefore, the communication wirings are connected at a high frequency. Specifically, power in the commercial frequency band is attenuated or cut off, and the frequency band used for communication signals (usually higher than the commercial frequency (for example, 50 Hz or 60 Hz), for example, about 1 to 50 MHz, particularly 2 to 30 MHz. The wirings are connected to each other through a signal transmission filter unit capable of transmitting the signal).

  The filter body of the signal transmission filter section includes a high-pass filter (HPF) that has low impedance in the used frequency band of communication signals and high impedance in the commercial frequency band, and a band-pass filter (BPF that blocks power in a specific frequency band) ) And band elimination filter (BEF) can be used. An example of the HPF is a capacitor (capacitor, C). The signal transmission filter unit includes such a filter main body, and a communication wiring can be connected to the main body. For example, wiring is provided in the filter main body, and a fitting portion to which a filter connecting portion provided at the end of the communication wiring can be connected is provided at the end of the wiring.

  If the signal transmission filter section is exposed, the communication apparatus of the present invention may be damaged when moved or installed. Therefore, the signal transmission filter unit is preferably housed in the housing. The case is not particularly limited as long as it can protect the filter unit. Specifically, for example, the housing accommodates the filter main body, and a fitting portion that connects the communication wiring is provided at an end of the main body so that the fitting portion is exposed.

  The communication device of the present invention transmits the communication signal transmitted to both power supply paths to the distribution board (the main line), leaks to the outside from the distribution board via the lead-in line, or conversely, the communication signal from the outside In order to reduce the transmission of noise and noise to the power supply path, a blocking filter unit is provided for each power supply path. Each blocking filter unit is assumed to be capable of transmitting commercial frequency power from the distribution board to each power supply path. For example, a low-pass filter (LPF) that has a low impedance in the commercial frequency band and a high impedance in the frequency band of the communication signal, or a BPF or BEF that cuts off a current in a specific frequency band can be used as the filter body. LPF includes an L-C circuit in which an inductance component (L) and a capacitor (capacitor, C) are combined.

  Each blocking filter unit includes a configuration including the filter main body and a main body connecting portion that connects the main body to each power supply path. The filter body is preferably protected by being housed in a case or the like.

  The blocking filter unit may be attached only to the first power supply path and the second power supply path for performing PLC, and when the indoor wiring includes unit cables other than the unit cables for constructing the both power supply paths, all It may be attached to the main power branch line of the unit cable. In the latter case, crosstalk can be prevented when PLC is performed using a branch line included in an arbitrary unit cable.

  Each blocking filter section can be attached to any position between the connection point of the communication wiring and the distribution board in each power supply path. When the power supply path is composed of a branch line for unit cable wiring and a branch line for main power supply, a blocking filter portion is attached to the branch line for main power supply. A unit cable of the present invention in which a blocking filter portion is provided in advance on the main power supply branch line may be prepared and arranged in a house.

  If the impedance is not matched between the connected communication wires, the communication signal is reflected near the connection portion of both wires, and the communication signal is attenuated by this reflection. Therefore, it is preferable to match impedance between communication wires. For example, a communication device in which an impedance matching unit is provided between communication wires is constructed. For the impedance matching portion, a transformer formed by winding a primary winding and a secondary winding on the outer periphery of a magnetic member such as a ferrite core can be used. The impedance can be matched by adjusting the winding ratio of each winding so that the signal upstream side (sending side) has high impedance and the signal downstream side (receiving side) has low impedance. It is preferable that the impedance matching unit is also housed in the housing since there is little risk of damage during installation of the communication device of the present invention.

  When there are two communication wires, the first communication wire and the second communication wire, impedance matching is achieved by connecting one to the primary winding and the other to the secondary winding. Can do. That is, only one impedance matching unit is required, that is, one magnetic member, one winding, and one secondary winding. When three or more communication wires can be connected, a plurality of impedance matching units are used. For example, the primary winding of each impedance matching unit can be connected to each communication wiring, and the secondary winding draws a loop.

  By performing in-home power line carrier communication using the communication apparatus of the present invention, it is possible to reduce crosstalk and branch loss and to perform good communication. Also, by constructing the indoor wiring with the unit cable of the present invention and connecting the communication wirings via the signal transmission filter section, it is possible to reduce crosstalk and branching loss when performing in-home power line carrier communication, and to achieve good communication Can be done.

Embodiments of the present invention will be described below.
<Example 1>
FIG. 1 (I) is a schematic configuration diagram showing an in-home power line carrier communication system provided with the communication device of the present invention, (II) is a schematic configuration diagram of a junction box provided in this device, and (III) is in this device. It is a schematic block diagram of the provided blocking filter part. In the drawings, the same reference numerals denote the same items. This system uses some of the indoor wiring (branch lines for wiring 21, 31) among the indoor wiring (wiring branch lines 21, 22, 31, 32, 41, 42 ...) for the signal transmission path. Then, in-house PLC is performed. Specifically, a communication terminal device (first communication terminal device) 60 such as a personal computer connected to the distribution board 101 via the first power supply path (the main power supply branch line 20 and the wiring branch line 21), and The first power supply path with the communication terminal device (second communication terminal device) 61 connected to the distribution board 101 via the second power supply path (the main power supply branch line 30 and the wiring branch line 31). The communication signal is exchanged using the second power supply path as a signal transmission path.

  The indoor wiring is composed of unit cables 2, 3, and 4. The cable 2 includes a plurality of wiring branch lines 21 and 22, a main power branch line 20 connected to the distribution board 101, and the wiring branch lines 21 and 22 and the main power branch line 20 electrically. A branch connection portion 23 to be connected and a resin mold portion 24 covering the connection portion 23 are configured. The same applies to the cables 3 and 4, including the main power branch lines 30 and 40, the wiring branch lines 31, 32, 41 and 42, the branch connection parts 33 and 43, and the resin mold parts 34 and 44, respectively. . One end of each wiring branch line 21, 22, 31, 32, 41, 42 is connected to the branch connection parts 23, 33, 43, and an outlet, a lighting device, etc. are provided at the other end. One end of each main power supply branch line 20, 30, 40 is connected to the branch connection parts 23, 33, 43, and the other end is connected to the distribution board 101. Electric power is supplied to the wiring branch lines 21, 22, 31, 32, 41, and 42 by the main power supply branch lines 20, 30, and 40.

  When such indoor wiring is used as a PLC signal transmission path, the system includes a communication device 1 as well as power line carrier communication devices (PLC modems) 50 and 51 connected to the wiring branch lines 21 and 31. The communication device 1 is a device for preventing crosstalk from occurring from the distribution board 101 via the lead-in line 200 and enabling good communication between the communication terminal devices 60 and 61. Hereinafter, the communication apparatus 1 will be described.

  The communication device 1 enables transmission of communication signals between the communication terminal devices 60 and 61 without passing through the distribution board 101. Specifically, a blocking filter unit (first blocking filter unit) 10a disposed on the main power supply branch line 20, and a blocking filter unit (second blocking filter unit) 10b disposed on the main power supply branch line 30; A signal for high-frequency connection between the communication wiring (first communication wiring) 11a connected to the branch connection portion 23 and the communication wiring (second communication wiring) 11b connected to the branch connection portion 33 And a junction box 12 that houses the transmission filter portion 12f.

  The blocking filter units 10a and 10b include a low-pass filter (LPF) that allows power in a commercial frequency band (50 Hz or 60 Hz) to pass and attenuates a signal in a use frequency band (1 to 50 MHz) of a communication signal. By arranging such a filter unit 10a (10b) on the main power supply branch line 20 (30), communication signals from the communication terminal device 60 (61) can be connected to the branch connection line 21 (31). Even if it is transmitted to the main power supply branch line 20 (30) via 23 (33), it is attenuated by the filter unit 10a (10b). Therefore, it is possible to prevent the communication signal from being transmitted to the distribution board side from the filter unit 10a (10b). In addition, even if an external communication signal or noise is transmitted from the lead-in line 200 to the main power supply branch line 20 (30) via the distribution board 101, it is attenuated by the filter unit 10a (10b), and the branch line for wiring Transmission to the 21 (31) side can be prevented.

  As shown in FIG. 1 (III), the blocking filter unit 10a (10b) is configured by an L-C circuit including a coil L serving as an inductance component and a capacitor C. The circuit is housed in a case for protection.

  The communication wires 11a and 11b are used as transmission paths for transmitting communication signals between the communication terminal devices 60 and 61. These wirings 11a and 11b are connected via the connection box 12 to enable communication between the communication terminal devices 60 and 61.

  The communication wires 11a and 11b are both parallel two wires having a shielding layer. One end of the wiring 11a (11b) is connected in advance to the branch connection portion 23 (33) of the unit cable 2 (3), and the other end is connected to the connection box 12. A terminal portion is provided in advance at the end of the wiring 11a (11b) so that it can be connected to the connection box 12.

  The connection box 12 connects the communication wires 11a and 11b so as to be able to transmit communication signals, and a plurality of fitting portions 12t to which the terminal portions of the wires 11a and 11b can be connected, and the wires 11a, 11b, a wiring part 12l that connects between the fitting parts 12t to which wirings of the same potential are connected, a signal transmission filter part 12f provided in the wiring part 12l, and a housing for housing these parts With body 12h.

  Connecting the communication wires 11a and 11b via the connection box 12 results in the unit cables 2 and 3 (main power branch lines 20 and 30) being electrically connected, and the commercial frequency band. The main power branch lines 20 and 30 are short-circuited at the power of Therefore, the connection box 12 includes a signal transmission filter unit 12f that connects the communication wires 11a and 11b at a high frequency. The filter unit 12f is a high-pass filter (HPF) that has a high impedance in the commercial frequency band and a low impedance in the use frequency band of the communication signal, and uses a capacitor. The filter unit 12f is connected to the wiring belonging to the wiring unit 12l.

  The wiring unit 12l is configured using a wiring capable of transmitting a communication signal, and includes more wiring than the number of wirings constituting the communication wiring to be connected. In this embodiment, a total of eight fitting portions 12t are provided so that four communication wires can be connected, and among the two wires constituting one communication wire, wires of the same potential are connected to each other. The wiring part 12l is configured as described above. In the connection box 12 shown in FIG. 1, the number of wiring portions and the number of fitting portions are increased so that not only the communication wires 11a and 11b but also more communication wires can be connected. Therefore, for example, when the unit cable 4 includes a communication wiring, the communication terminal connected to the wiring branch line 41 of the cable 4 by connecting this wiring to the empty fitting portion 12t of the connection box 12 Communication can be performed between the device and the communication terminal devices 60 and 61.

  A fitting portion 12t into which the terminal portions of the wirings 11a and 11b are fitted is provided at the end of each wiring constituting the wiring portion 12l so that the communication wirings 11a and 11b can be connected. By making the connection box 12 and the communication wires 11a and 11b detachable easily, the connection work can be easily performed.

  The wiring part 12l and the signal transmission filter part 12f are housed in the housing 12h. By storing in the housing 12h, it is possible to prevent the filter unit 12f from being damaged when the communication device 1 is installed or transported. The housing 12h is preferably made of an insulating material such as resin.

  In order to attach such a communication device 1 to the indoor wiring, first, the blocking filter portions 10a and 10b are attached to the main power branch lines 20 and 30 of the unit cables 2 and 3, respectively. The attachment positions of the filter portions 10a and 10b are preferably in the vicinity of the branch connection portions 23 and 33 in consideration of branch loss and the like.

  Next, the terminal portions of the communication wires 11a and 11b included in the unit cable are connected to the fitting portions 12t of the connection box 12, respectively. Thus, the communication device 1 can be easily attached to the indoor wiring. When there is a fitting part 12t to which no communication wiring is connected, a separate wiring may be connected to the empty fitting part 12t so that the wiring part 12l becomes a closed loop.

  By constructing an in-house PLC system including the communication device of the present invention, since no communication signal is exchanged via the distribution board, crosstalk can be prevented. In addition, since the communication signal is not transmitted to the wiring that does not perform the PLC, for example, the wiring included in the unit cable 4 without using the distribution board, the system including the communication device of the present invention has a branch loss. The attenuation of the communication signal due to can be effectively reduced. Therefore, this system can perform good home PLC. In addition, the communication device of the present invention can be easily attached to the indoor wiring, is excellent in installation workability, and is less likely to damage the components of the communication device and the indoor wiring during the installation work.

<Example 2>
Next, the communication apparatus of the present invention having an impedance matching unit will be described. FIG. 2 is a schematic configuration diagram for explaining a state in which a home power line carrier communication system including the communication device of the present invention is constructed. Similar to the system shown in the first embodiment, this system performs home PLC using indoor wiring, and includes a communication device 1 ′. The communication device 1 ′ has the same basic configuration as the communication device 1 of the first embodiment, and the signal transmission filter unit 12f that connects the blocking filter units 10a and 10b and the communication wires 11a and 11b at high frequency. With. The filter unit 12f is housed in the connection box 12. A feature of the communication device 1 ′ is that an impedance matching unit 13 is provided. Hereinafter, this point will be mainly described, and description of other configurations will be omitted.

Impedance matching unit 13, and the magnetic member 13m such ferrite cores composed of the primary winding 13c ₁ and the secondary winding 13c ₂ Metropolitan wound around the magnetic member 13m. That is, the communication device 1 ', constituting the wiring portion in the junction box 12 in the primary winding 13c ₁ and the secondary winding 13c _2. The communication device 1 ′ includes a plurality of such impedance matching sections 13 (four in FIG. 2). These impedance matching sections 13 can also be stored in the housing 12h of the junction box 12 to protect the matching section 13, and the matching section 13 can be damaged during installation work or transportation of the communication device 1 '. Can be prevented.

Primary winding 13c ₁ is provided with a fitting portion 12t at both ends, the terminal portion provided at an end portion of the two-wire constituting the parallel two-wire forming communication lines 11a, and 11b are respectively connected. The wiring between the fitting portion 12t and the magnetic member 13m (1 winding 13c ₁ of the end portion side) is provided with a signal transmission filter unit 12f.

The secondary winding 13c ₂ are both end portions are connected to an end of the secondary winding wound around the magnetic member of the other of the impedance matching section. That is, the secondary winding 13c ₂ of these four impedance matching section 13, make all the connected one loop.

The number of turns of the primary winding 13c ₁ and the secondary winding 13c ₂ is appropriately adjusted so that the communication signal receiving side impedance and the sending side impedance are made as equal as possible. The communication device 1 ′ having such an impedance matching unit can prevent signal reflection at a connection portion between communication wires and reduce signal attenuation.

  The first and second embodiments described above can be appropriately changed without departing from the gist of the present invention, and is not limited to the above-described configuration. For example, as the unit cable, a main power branch line provided with a blocking filter portion in advance may be used. By using such a unit cable as an indoor wiring, it is not necessary to attach a blocking filter portion in the house.

  The communication device of the present invention can be suitably used when performing in-home power line carrier communication using indoor wiring as a signal transmission path. The unit cable of the present invention can be suitably used for indoor wiring, particularly indoor wiring that is expected to perform in-home power line carrier communication.

(I) is a schematic configuration diagram showing a state in which a PLC system including the communication device of the present invention is constructed, (II) is a schematic configuration diagram of a connection box of the communication device of the present invention, and (III) is a communication device of the present invention. It is a schematic block diagram of the blocking filter part. It is a schematic block diagram which shows the state which constructed | assembled the PLC system which provides this invention communication apparatus provided with an impedance matching part. It is a schematic block diagram explaining the state which constructed | assembled the PLC system using indoor wiring. It is a schematic block diagram which shows a unit cable typically.

Explanation of symbols

1,1 'communication device 2,3,4 unit cable
10a, 10b Blocking filter 11a, 11b Communication wiring 12 Junction box
12f Signal transmission filter part 12t Fitting part 12l Wiring part 12h Housing
13 impedance matching section 13m magnetic member 13c ₁ 1 winding 13c ₂ 2 winding
20,30,40 Branch line for main power supply 21,22,31,32,41,42 Branch line for wiring
23,33,43 Branch connection 24,34,44 Molded part 50,51 PLC modem
60,61 Communication terminal equipment
100 House 101 Distribution board 102,103,104 Branch trunk 110,111 PLC modem
120,121 Communication terminal device 200 Service line
U unit cable _{u 1, u 2, ...,} u n branch lines S branch connection portion M mold section

Claims (4)

Power line carrier communication between the first communication terminal device connected to the distribution board via the first power supply path and the second communication terminal device connected to the same distribution board via the second power supply path A communication device for performing
The first communication terminal device and the second communication are arranged between a first communication line connected to the first power supply path and a second communication line connected to the second power supply path. When communicating with a terminal device, a signal transmission filter unit that attenuates power in the commercial frequency band;
A first blocking filter unit for preventing communication signals from being transmitted from the first communication wiring to the distribution board side of the first power supply path;
A communication device comprising: a second blocking filter unit that prevents a communication signal from being transmitted from the second communication wiring to the distribution board side of the second power supply path.   2. The communication apparatus according to claim 1, further comprising an impedance matching unit that performs impedance matching between the two communication wires. The first power supply path and the first communication wiring are configured by wiring of a first unit cable,
2. The communication device according to claim 1, wherein the second power supply path and the second communication wiring are configured by wiring of a second unit cable. A unit cable comprising a main power branch line connected to a distribution board, a plurality of wiring branch lines used for indoor wiring, and a branch connection part for connecting all these branch lines,
Among the plurality of wiring branch lines, any one of the wiring branch lines has a filter connection part to which a signal transmission filter part is connected at an end thereof.
The signal transmission filter unit is
The first communication terminal device is connected to another wiring branch line that does not have the filter connection portion among the plurality of wiring branch lines, and the main power supply branch line is connected to the same distribution board. In the unit cable, when the second communication terminal device is connected to another wiring branch line that does not have the filter connecting portion, and power line carrier communication is performed between the two communication terminal devices, the two wiring terminals having the filter terminal portion are used. It is interposed between the branch lines to attenuate the power in the commercial frequency band,
The main power branch line is provided with a blocking filter portion,
The blocking filter unit is
A unit cable for preventing a communication signal from being transmitted from a branch line for wiring having the filter connection portion to a distribution board side of the branch line for main power supply.

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