JP2010147520A - Filter for distribution switchboard, distribution switchboard, and distribution switchboard power line communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distribution switchboard, or the like capable of reducing size and costs, while suppressing deterioration in noise and impedance in power-line communication. <P>SOLUTION: The distribution switchboard 11 is connected to a single-phase three-line power line L. The distribution switchboard 11 includes: first and second branch lines 12, 13 of which one end is connected to a neutral line L0 and first and second voltage lines L1, L2, and the other end is connected to an outlet 5; a branch line 14 for communication of which one end is connected to the neutral line L0 and the second voltage lines L2 and the other end is connected to power-line communication equipment 7; a capacitor 15 for coupling to connect the first voltage line L1 to the second one L2; a common mode choke filter 16 composed by magnetically coupling coils formed each by the first and second branch lines 12, 13; and capacitors 17, 18 at first and second outlet sides, respectively, provided between the outlet 5 and the common mode choke filter 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filter, a distribution board, and a distribution board power line communication system used in a distribution board that is installed at a construction site or the like and that is connected to a power line communication device to enable power line communication.

  In general, in construction sites and the like, a temporary distribution board connected to a single-phase three-wire power line is used as a main line in order to connect machine tools, lighting fixtures and the like to supply power to them. Yes. Conventionally, as shown in FIG. 3, the distribution board 1 includes a first voltage line L <b> 1 and a second voltage line that are opposite in phase to the grounded neutral line L <b> 0 in the power line L and in which a voltage is applied to the neutral line. A plurality of breakers 2 connected to one of the voltage lines L2 and an outlet 5 connected to each breaker 2 to which the machine tool 3, the lighting device 4, and the like are connected are provided.

  In recent years, a technique has been proposed in which a power line communication device is connected to such a distribution board and information from an information device such as a personal computer is communicated via the power line. For example, Patent Literature 1 proposes a power line carrier communication system including a power distribution unit connected to a power line and a power line carrier communication modem connected to the power distribution unit.

  Patent Document 2 proposes a power line relay adapter including a branch line connected to a power line and a modem socket to which a PLC modem is connected to the branch line. Further, Patent Document 3 proposes a power line communication method in which a plurality of branch lines are connected to a single-phase three-wire lead-in line, and communication is performed by connecting a communication device to the branch line.

  When power line communication is performed via a distribution board, noise is generated due to the influence of machine tools connected to the distribution board, noise wraps around the transmission path, or multiple lighting devices with large capacity, etc. As a result, the impedance decreases and the signal is reflected at the connection part of the device, which causes deterioration of the transmission line of the power line due to the influence of the connected device. In addition, when a power line communication signal is injected into a neutral line that is common and one phase (first voltage line or second voltage line), each line is wired within the same sheath in a power line such as a captyre. Therefore, the communication signal leaks from the coupling due to the distributed capacity to the different phase, and there is a disadvantage that the influence of noise and the impedance reduction in the different phase also occur.

  For this reason, in the techniques described in Patent Documents 1 to 3, for example, as shown in FIG. 4, the power line communication device 7 is connected to the distribution board 6 to perform power line communication of information from the information device 8. 9 is provided with a noise filter 10 for noise reduction and high impedance.

  For example, as shown in FIG. 5, the noise filter 10 is connected between a normal mode filter 10a formed by winding a branch wire 9 composed of a pair of conducting wires 9a around a toroidal core and the pair of conducting wires 9a. And a capacitor circuit 10b. In this noise filter 10, the transmission path is made high impedance by the normal mode filter 10a, and noise is reduced by the capacitor 10b.

JP 2007-189451 A JP 2007-6371 A JP 2007-174547 A

The following problems remain in the conventional technology.
That is, in the above-described conventional technique, noise filters are connected in series to each branch line, that is, each phase, so that the number of filters increases. In addition, a large toroidal core must be employed for each noise filter corresponding to the allowable current capacity of the outlet connected to the branch line. For this reason, the distribution board is increased in size and the cost of components is increased, and there is a disadvantage that the number of outlets to be connected is limited. In particular, it is not suitable for portable distribution boards used at construction sites.

  The present invention has been made in view of the above-described problems, and is used for a distribution board capable of suppressing noise and impedance reduction caused by a machine tool, a lighting device, or the like during power line communication, and reducing size and cost. An object is to provide a filter, a distribution board, and a distribution board power line communication system.

  The present invention employs the following configuration in order to solve the above problems. That is, the distribution board filter of the present invention has a single-phase 3 composed of a grounded neutral line and a first voltage line and a second voltage line that are opposite in phase to each other and have a voltage applied to the neutral line. A pair of first branch lines connected to a wire-type power line, one end connected to the neutral line and the first voltage line, and an outlet connected to the other end, the neutral line and the first line One end is connected to a pair of second branch lines having one end connected to two voltage lines and an outlet connected to the other end, and one of the neutral line, the first voltage line, and the second voltage line. A filter used for a distribution board comprising a pair of communication branch lines to which a power line communication device is connected at the other end, and a coupling capacitor for connecting the first voltage line and the second voltage line. The first branch line connected to the first voltage line and the second voltage line connected to the first voltage line. A common mode choke filter configured by magnetically coupling a pair of coils respectively formed by two branch lines, and the pair of first branch lines provided between the outlet and the filter. A first outlet side capacitor to be connected; and a second outlet side capacitor to connect the pair of second branch lines to each other.

  The distribution board according to the present invention is a single-phase three-wire system comprising a first voltage line and a second voltage line that are opposite in phase to a grounded neutral line and to which a voltage is applied to the neutral line. A pair of first branch lines having one end connected to the neutral line and the first voltage line and an outlet connected to the other end, and the neutral line And one end connected to the neutral line and one of the first voltage line and the second voltage line, one end connected to the second voltage line and an outlet connected to the other end. Connected to the power line communication device at the other end, a coupling capacitor for connecting the first voltage line and the second voltage line, and a connection capacitor connected to the first voltage line. A pair of coils respectively formed by the first branch line and the second branch line connected to the second voltage line are magnetized. A common mode choke filter configured to be coupled together, a first outlet side capacitor provided between the outlet and the common mode choke filter, and connecting the pair of first branch lines to each other and the pair of the first And a second outlet-side capacitor that connects the two branch lines to each other.

  That is, in these distribution panel filters and distribution panels, the coupling capacitors that connect the first voltage line and the second voltage line, which are out of phase with each other, are coupled at a high frequency between the different phases and connected to the first voltage line. The first branch line is a common mode choke filter configured by magnetically coupling a pair of coils respectively formed by the first branch line and the second branch line connected to the second voltage line. Since the common mode current flowing through the second branch line is suppressed, the power line communication becomes a common mode between different phases coupled at a high frequency, and the impedance can be increased.

  Therefore, since the common mode choke filter is inserted between the different phases coupled at a high frequency to increase the impedance, an increase in the allowable current capacity necessary for the filter can be suppressed, and the toroidal core to be used can be downsized. . Moreover, since only one common mode choke filter needs to be installed for two outlets, the number of parts can be reduced. Thereby, size reduction and cost reduction of a distribution board can be achieved.

  Further, in this distribution board, a first outlet side capacitor provided between the outlet and the common mode choke filter and connecting the pair of first branch lines to each other and the second outlet side connecting the pair of second branch lines to each other. Since the outlet side capacitor is provided, noise from a machine tool or the like can be reflected by the capacitor.

  A distribution board power line communication system according to the present invention comprises a plurality of the distribution boards according to the present invention connected to a power line, and a power line communication device connected to the communication branch line. . That is, in this distribution board power line communication system, by connecting a power line communication device to the communication branch line of each distribution board connected to the power line, good power line communication is possible between the distribution boards using the power line communication device. At the same time, it is possible to construct a communication network that is easy to move and install at a construction site or the like by a small and low cost distribution board.

The present invention has the following effects.
That is, according to the distribution board filter, distribution board, and distribution board power line communication system according to the present invention, a common mode choke filter in which a coil is constituted by a first branch line and a second branch line; Since the first and second outlet-side capacitors provided on the outlet side are provided, it is possible to achieve high impedance and noise reduction, as well as miniaturization and reduction of member costs. . Therefore, according to the present invention, a small and low-cost portable distribution board can be obtained with good transmission path characteristics, and a temporary distribution network that can be constructed at a construction site or the like and can be easily installed. It is particularly suitable as a board.

  Hereinafter, an embodiment of a filter for a distribution board, a distribution board, and a distribution board power line communication system according to the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the distribution board 11 of the present embodiment includes a first voltage line L1 and a first voltage line L1 that are opposite in phase to the grounded neutral line L0 and in which a voltage of 100 V is applied to the neutral line L0. A distribution board connected to a single-phase three-wire power line L made up of two voltage lines L2, which is connected to the other distribution board 11 via the power line L when the power line communication device 7 is connected. Communication is also possible.

  The distribution board 11 includes a pair of first branch lines 12 having one end connected to the neutral line L0 and the first voltage line L1 and the other end connected to the outlet 5 via the breaker 2, and a neutral line. A pair of second branch lines 13 having one end connected to L0 and the second voltage line L2 and the other end connected to the outlet 5 via the breaker 2, the neutral line L0, the first voltage line L1, and the second A pair of communication branch lines 14 having one end connected to one of the voltage lines L2 and the power line communication device 7 connected to the other end.

  In addition, the distribution board 11 includes a coupling capacitor 15 that connects the first voltage line L1 and the second voltage line L2, and a first branch line 12 and a second voltage line that are connected to the first voltage line L1. A common mode choke filter 16 configured by magnetically coupling a pair of coils respectively formed by the second branch line L2 connected to L2, and provided between the outlet 5 and the common mode choke filter 16 A first outlet side capacitor 17 that connects the pair of first branch lines 12 to each other, and a second outlet side capacitor 18 that connects the pair of second branch lines 13 to each other.

The common mode choke filter 16 has a magnetic core such as a toroidal core (illustrated) in which one of a pair of first branch lines 12 and one of a pair of second branch lines 13 are wound by bifilar winding or cancellation winding. Abbreviation).
As described above, the common mode choke filter 16, the first outlet side capacitor 17, and the second outlet side capacitor 18 constitute a noise filter unit (distribution panel filter) 20.

Further, the distribution board power line communication system of the present embodiment is connected to the plurality of distribution boards 11 connected to the power line L and the communication branch line 14 of each distribution board 11 as shown in FIG. Power line communication device 7. The power line communication device 7 is connected to an information device 8 such as a personal computer that inputs / outputs information to be transmitted / received to / from the power line communication device 7.
A plurality of the distribution boards 11 are arranged at appropriate locations according to work at a construction site or the like, and are moved and arranged at locations suitable for work according to the progress of the work.

  In FIG. 1, in order to simplify the illustration, a pair of the first branch line 12 and the second branch line 13 are connected to the power line L, but in reality, a plurality of pairs are connected.

  In the distribution board 11 of the present embodiment, the different phases are coupled at a high frequency by the coupling capacitor 15 that connects the first voltage line L1 and the second voltage line L2 that are different from each other, and is connected to the first voltage line L1. The common mode choke filter 16 configured by magnetically coupling a pair of coils respectively formed by the first branch line 12 and the second branch line L2 connected to the second voltage line L2 Since the common mode current flowing through the second branch line 12 and the second branch line 13 is suppressed, the power line communication becomes a common mode between different phases coupled at a high frequency, and the impedance can be increased.

  Therefore, since the common mode choke filter 16 is inserted between the different phases coupled at a high frequency to increase the impedance, an increase in the allowable current capacity necessary for the filter can be suppressed, and the toroidal core to be used can be downsized. it can. Further, since only one common mode choke filter 16 needs to be installed for the two outlets 5, the number of parts can be reduced. Thereby, size reduction and cost reduction of a distribution board can be achieved.

  Further, since the distribution board 11 includes a first outlet side capacitor 17 and a second outlet side capacitor 18 provided between the outlet 5 and the common mode choke filter 16, a machine tool is provided by these capacitors. Etc. can be reflected.

  Further, in the distribution board power line communication system of the present embodiment, the power line communication device 7 is connected to the communication branch line 14 of each distribution board 11 connected to the power line L, so that the power line communication is performed between the distribution boards 11. Good power line communication by the device 7 becomes possible, and a small and low-cost distribution board 11 makes it possible to construct a communication network that can be easily installed at a construction site or the like.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the information device 8 such as a personal computer is connected to the distribution board 11 via the power line communication device 7 and information and the like are communicated with the power line, but other devices may be connected. For example, an IP telephone device may be connected to the power line communication device 7 of each distribution board 11 so that a call can be made between the distribution boards 11 by power line communication.

1 is a configuration diagram illustrating a distribution board in an embodiment of a distribution board filter, a distribution board, and a distribution board power line communication system according to the present invention. In this embodiment, it is a block diagram which shows the whole distribution board power line communication system. In the prior art example of the distribution board which concerns on this invention, it is a block diagram which shows a distribution board. It is a block diagram which shows the distribution board which incorporated the noise filter in the prior art example of the distribution board which concerns on this invention. It is an equivalent circuit diagram which shows a noise filter in the prior art example of the distribution board which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 6, 11 ... Distribution board, 2 ... Breaker, 5 ... Outlet, 7 ... Power line communication apparatus, 12 ... First branch line, 13 ... Second branch line, 14 ... Communication branch line, 15 ... Coupling Capacitor, 16 ... common mode choke filter, 17 ... first outlet side capacitor, 18 ... second outlet side capacitor, 20 ... noise filter section (distribution panel filter) L ... power line, L0 ... neutral line, L1 ... 1st voltage line, L2 ... 2nd voltage line

Claims (3)

The neutral wire is connected to a single-phase three-wire power line composed of a first voltage line and a second voltage line that are opposite in phase to each other and have a voltage applied to the neutral wire. One end is connected to the other end of the pair of the first branch line, one end connected to the sex wire and the first voltage line, and the other end connected to the outlet, and the other end to the other end. A pair of second branch lines connected to an outlet, a pair of one end connected to one of the neutral line, the first voltage line, and the second voltage line and a power line communication device connected to the other end A filter used for a distribution board comprising a communication branch line, and a coupling capacitor for connecting the first voltage line and the second voltage line,
A pair of coils formed by the first branch line connected to the first voltage line and the second branch line connected to the second voltage line are magnetically coupled to each other. A common mode choke filter,
A first outlet side capacitor provided between the outlet and the filter and connecting the pair of first branch lines to each other; and a second outlet side capacitor connecting the pair of second branch lines to each other. A distribution board filter characterized by that. A distribution board connected to a single-phase three-wire power line composed of a first voltage line and a second voltage line that are opposite in phase to each other and are applied with a voltage to the neutral line. There,
A pair of first branch lines having one end connected to the neutral line and the first voltage line and an outlet connected to the other end;
A pair of second branch lines having one end connected to the neutral line and the second voltage line and an outlet connected to the other end;
A pair of communication branch lines having one end connected to the neutral line and one of the first voltage line and the second voltage line and a power line communication device connected to the other end;
A coupling capacitor for connecting the first voltage line and the second voltage line;
A pair of coils formed by the first branch line connected to the first voltage line and the second branch line connected to the second voltage line are magnetically coupled to each other. A common mode choke filter,
A first outlet-side capacitor that is provided between the outlet and the common mode choke filter and connects the pair of first branch lines to each other; and a second outlet-side capacitor that connects the pair of second branch lines to each other A distribution board characterized by comprising: A plurality of distribution boards according to claim 2 connected to a power line,
A distribution board power line communication system, comprising: a power line communication device connected to the communication branch line.

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