JP3215802B2 - Power line communication method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line communication method and apparatus for transmitting information using a third line using a power line as a part of a data transmission line, and more particularly to a power line load that eliminates the need for a blocking coil. The present invention relates to a power line communication method and apparatus that enable power line communication that is not affected by power, and that enable simplification and cost reduction of the apparatus.

[0002]

2. Description of the Related Art Recently, the advantages of power line communication are as follows: 1) The presence or absence of information to be transmitted can be determined by the presence or absence of power. 2) The power line has a high structural strength. 3) The existing power line can be used. It has been recognized again that there is no need to lay a new transmission line, and the use of power line communication in systems such as various facilities has been considered.

[0003] However, the conventional power line communication method removes the influence of the high-frequency current generated by the various devices connected to the power line and the power supply target and the device itself, that is, the effect of the high-frequency current generated by the device. A blocking coil is inserted upstream of the power line used for power line communication, and this blocking coil prevents high-frequency current generated by power line communication from flowing to various devices that are connected to the power line and that are to be supplied with power on the upstream side. It has a configuration to do.

[0004]

However, in the case of the conventional configuration in which a blocking coil is inserted into a power line, there has been a problem that the configuration is complicated by the blocking coil and the whole system becomes expensive.

Therefore, the present invention provides a power line communication method and apparatus which eliminates the need for a blocking coil, enables power line communication unaffected by power system loads, and enables simplification and cost reduction of the apparatus. The purpose is to provide.

[0006]

In order to achieve the above object, according to the present invention, the power line is connected to the third line via a network coupler so that the power line is connected to the third line with a high-frequency vector. Power line communication for performing power line communication between the power line and the third line at the same potential.
The method, wherein the network coupler has a polarity
Multiple toroidal coils wound around a toroidal core
One end of each toroidal coil has the same polarity
The other end of each toroidal coil is connected to the third wire.
Connected to the power line side via a capacitor
In addition, the power line has the same potential as the third line at a high frequency.
The power line and the third line are used as communication paths .

[0007]

[0008] The power line may be a single-phase power line for transmitting single-phase AC power.

[0009] The power line may be composed of a multi-phase power line for transmitting multi-phase AC power.

[0010] Further, the third line can be constituted by a ground line.

Further, the third line can be formed of a conductor not connected to the ground line or a telephone line.

Further, the present invention provides a power line having the same potential as a high-frequency vector with respect to the third line by connecting the single-phase power line and the third line via a network coupler. A power line communication device for performing power line communication between the power line and the third line.
A plurality of power line modems connected between the lines, and control means for controlling the power line communications between said plurality of power line modems
Comprising, the network coupler, a plurality of a polar
The toroidal coil is wound around the toroidal core,
One end of each toroidal coil has the same polarity and the third line
The other end of each toroidal coil is connected to a capacitor
And connected to the power line side via
The power line is set to the same potential as the high frequency with respect to the third line,
The power line and the third line are used as communication paths .

[0013]

Further, the power line may be constituted by a single-phase power line for transmitting single-phase AC power.

Further, the power line may be constituted by a multi-phase power line for transmitting multi-phase AC power.

Further, the third line can be constituted by a ground line.

Further, the third line can be formed of a conductor not connected to the ground line, or a telephone line.

Further, the plurality of power line modems include one main power line modem and a plurality of sub power line modems, and the plurality of sub power line modems are respectively connected to an information collection control device via an input / output control unit. Connected, the main power line modem is connected to the control means, and configured to perform power line communication with the information collection control device via the plurality of sub power line modems under the control of the control means. it can.

Here, the control means is connected to a general line via a general line modem, and transmits the information obtained by power line communication with the information collection control device via the plurality of sub power line modems to the general line. It can be configured to transmit to a line.

The control means is connected to a general line via a general line modem, and transmits information obtained from the general line to the information collection control device via the plurality of sub power line modems. can do.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a power line communication method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a power line communication method and apparatus according to the present invention. In the embodiment shown in FIG. 1, power line communication is performed between the power line modems M1 to M3 using a power line P whose one end is connected to a 2P or 3P no-fuse breaker NF. Is connected via a network coupler NC.

Here, the network coupler NC is composed of a circuit composed of a toroidal coil and a capacitor for conducting high-frequency between the third line Q and the power line P, as will be described in detail later. By connecting the third line Q to the power line P via the NC, the power line P has the same high-frequency potential as the third line. As a result, the high-frequency power line communication generated by the power line modems M1 to M3 has a high frequency. Exist in the range of Q, and the power line modems M1 to M3
Does not flow beyond the power line communication section (range of Q) due to the above, thereby making it possible to perform power line communication between the power line modems M1 to M3 without inserting a blocking coil, which is conventionally required.

That is, the power line modem M2 is connected between the power line P and the third line Q as shown in a block 20, and controls the input and output of data from an information collection control device (not shown). The control units A21 and A22 are respectively connected to form a sub power line modem that performs power line communication with the power line modem M1 that forms the main power line modem.

The power line modem M3 has a
As shown in FIG. 3, input / output control units A31 and A32 for controlling the input and output of data from an information collection control device (not shown) are connected between the power line P and the third line Q, respectively. A sub power line modem for performing power line communication with the power line modem M1 constituting the modem is configured.

The power line modem M1 constituting the main power line modem has a power line P
And the third line Q, and connected to the personal computer PC,
C are power line modems M2 to M via power line modem M1.
By controlling the power line communication with the control unit 3, data collection processing is performed from information collection control devices whose inputs and outputs are controlled by the input / output control units A 21, A 21 and A 31 and A 3.

The personal computer PC includes:
A line modem m is connected and a personal computer PC
Controls the line modem m to transmit data from the information collection and control device collected via the power line modem M1 and the power line modems M2 to M3 to an external device via an NTT line or the like, The information collection control device can be controlled via such as.

Here, the power line P is connected to the power line modems M1 to M1.
A high frequency is generated by performing power line communication between M3, but the power line P is connected to the third line by the network coupler NC.
Since the electric potential is the same as the high frequency with respect to the line, this high frequency does not flow to the upstream side beyond the blocks 10 to 30.

As a result, it is possible to perform power line communication between the power line modems M1 to M3 without inserting a blocking coil as conventionally provided in the power line P.

FIG. 2 shows the configuration of the network coupler NC shown in FIG. 1 in the case where the power line P shown in FIG. 1 is constituted by a single-phase three-wire AC power line of lines L1, N and L2. It is. Here, the symbols (arrows) S-1 to S-3 shown in FIG. 2 respectively show the configuration shown in FIG.

That is, the symbol S shown in FIG.
3B shows a circuit including a toroidal coil 41 wound around a toroidal core 40 and having a directionality, and a capacitor 42 connected in series to the toroidal coil 41, as shown in FIG. FIG. 4 shows a specific configuration of the network coupler NC shown in FIG.

In FIG. 4, the toroidal core 40 includes:
Three toroidal coils 41-1 to 41 having directionality
-3 is wound, and one end of the toroidal coil 41-1 is connected to the third wire Q.
The other end of -1 is connected to line L2 of power line P via capacitor 42-1.

One end of the toroidal coil 41-2 is connected to the third line Q with the same polarity, and the other end of the toroidal coil 41-2 is connected to the line N of the power line P via the capacitor 42-2. Connected to.

One end of the toroidal coil 41-3 is connected to the third wire Q.
The other end of the power line 3 is connected to the line L1 of the power line P via the capacitor 42-3.

According to this configuration, the lines L1, N, and L2 of the power line P have the same high-frequency potential as the third line Q, and the power line modems M1 to M3 are connected to the lines L1, N, and L2 of the power line P. , The high frequency is superimposed by the power line communication, the high frequency flows only through the third line Q in the lines L1, N and L2 of the power line P, and does not flow through the other lines. L1, N,
There is no need to insert a blocking coil into L2, and there is no adverse effect on the equipment of the upstream circuit connected to the power line P.

FIG. 5 shows the configuration of the network coupler NC shown in FIG. 1 when the power line P shown in FIG. 1 is composed of single-phase AC power lines of lines R and S. Here, the symbol (arrow) S- shown in FIG.
1 to S-2 each show the configuration shown in FIG.

In the configuration shown in FIG. 5, a specific configuration of the network coupler NC is shown in FIG.

That is, the toroidal core 40 has two toroidal coils 41-1 to 41-2 having polarity.
Is wound, one end of the toroidal coil 41-1 is connected to the third wire Q with matching polarity, and the other end of the toroidal coil 41-1 is connected to the line of the power line P via the capacitor 42-1. Connected to S.

One end of the toroidal coil 41-2 is connected to the third line Q with matching polarity, and the other end of the toroidal coil 41-2 is connected to the line R of the power line P via the capacitor 42-2. Connected.

According to this configuration, the lines S and R of the power line P have the same high-frequency potential as the third line Q, and the lines S and R of the power line P are connected to the power line modems M1 to M1.
Even if a high frequency is superimposed by the power line communication by M3, the high frequency is superimposed on the lines R and S of the power line P and the third line Q
Through the line R, S of the power line P
There is no need to insert a blocking coil into each
There is no adverse effect on the equipment of the upstream circuit connected to the power line P.

The third line Q can be formed by using, for example, a ground line. The third line Q is formed by a specially installed conductor or an existing telephone line (telephone pair). Can also.

FIG. 7 shows that the power line P shown in FIG. 1 is composed of single-phase three-wire AC power lines of lines L1, N and L2.
When the third line Q is composed of a pair of telephone lines Q consisting of Q-1 and Q-2, the power line modems M1 and M2
2 conceptually shows a schematic configuration when power line communication is performed between the two.

Here, the power line modem M1 is connected between the lines N and L2 of the power line P, and the power line modem M2 is also connected between the lines N 'and L2' of the power line P 'and connected to the telephone line Q. Power line communication is performed between the power line modems M1 and M2 via a network coupler NC 'connected to the telephone line Q similarly to the NC.

Here, symbols (arrows) S1-1 to S1-3 and S2-1 constituting the network coupler NC.
To S2-2 and symbols (arrows) S1-1 'to S1-3' and S2-1 constituting the network coupler NC '
'To S2-2' respectively show the configuration shown in FIG.

According to this configuration, the lines L1, N and L2 forming the power line P have the same high-frequency potential as the lines Q-1 to Q-2 forming the telephone line (third line).
The lines L1 ', N', and L2 'constituting the same line have the same high-frequency potential as the lines Q-1 to Q-2 constituting the telephone line (third line). Therefore, the lines L1, N, L2 of the power line P
And a high frequency is superimposed on the lines L1 ', N', L2 'of the power line P' by the power line communication by the power line modems M1 and M2.
1, N, L2 and lines L1 ', N' of the power line P ',
It does not flow to the upstream side through L2 ', so that lines L1, N, L2 of power line P and line L1 of power line P'
', N', and L2 'do not adversely affect the other devices connected to the power lines P and P' and the devices on the upstream side even if the blocking coil is not inserted into each of them.

In the above embodiment, the configuration using one main power line modem M1 and one sub power line modem M2 has been described. However, a plurality of power line modems are used as the main power line modem M1, and the sub power line modem is used as the main power line modem M1. The same configuration can be obtained by using two or more power line modems.

The third line Q can be similarly configured by using a signal line other than the ground line and the telephone line.

[0048]

As explained above, according to the present invention,
By connecting the power line and the third line via a network coupler, the power line is set to the same potential as the high frequency with respect to the third line, and power line communication is performed between the power line and the third line. With such a configuration, it is possible to enable power line communication without using a blocking coil, thereby providing an effect that the device can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a power line communication method and apparatus according to the present invention.

FIG. 2 illustrates a case where the power line illustrated in FIG. 1 includes a single-phase three-wire AC power line including three lines.
FIG. 2 is a symbol diagram showing a configuration of the network coupler shown in FIG.

FIG. 3 is an explanatory diagram for explaining the meaning of the symbol shown in FIG. 2;

FIG. 4 is a circuit diagram showing a specific configuration of the network coupler shown in FIG. 2;

FIG. 5 is a symbol diagram showing a configuration of the network coupler NC shown in FIG. 1 in a case where the power line shown in FIG. 1 is composed of a single-phase AC power line composed of two lines.

6 is a circuit diagram showing a specific configuration of the network coupler shown in FIG.

FIG. 7 is a symbol showing the configuration of the network coupler shown in FIG. 1 in the case where the power line shown in FIG. 1 is formed of a single-phase three-wire AC power line and the third line is formed of a pair of telephone lines. FIG.

[Explanation of symbols]

 NF No fuse breaker M1 Power line modem (Main power line modem) M2 to M3 Power line modem (Sub power line modem) P Power line Q Third line A21, A22 Input / output control unit A31, A32 Input / output control unit NC Network coupler PC Personal computer m line modem

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-51518 (JP, A) JP-A-57-152736 (JP, A) JP-A-6-167527 (JP, A) JP-A-8-815 18490 (JP, A) JP-A-7-212165 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 3/50-3/60

Claims (13)

(57) [Claims] 1. A network card between a power line and a third line.
The power line is connected to the third
The same potential as a high-frequency vector with respect to the line, and performing power line communication between the power line and the third lineElectric
A power line communication method, The network coupler, Multiple toroidal coils with polarity are toroidal cores
And one end of each toroidal coil integrates the polarity.
On the other hand, the toroidal coil is connected to the third wire.
The other end must not be connected to the power line side via a capacitor.
And the power line is high frequency with respect to the third line.
And the power line and the third line as communication paths.
Feature Power line communication method. (2)The power line is It consists of a single-phase power line that transmits single-phase AC power
To be The power line communication method according to claim 1. (3)The power line is Characterized by a multi-phase power line that transmits multi-phase AC power
To be The power line communication method according to claim 1. (4)The third line is It is characterized by consisting of a ground wire The power line according to claim 1.
Communication method. (5)The third line is Consist of conductors or telephone wires not connected to the ground wire
Characterized by The power line communication method according to claim 1. 6.Network between single-phase power line and third line
Above the power line by connecting via a power coupler.
The third line is set to the same potential as a high-frequency vector,
Power line communication for performing power line communication between the power line and the third line
In the device, Plurality of power connected between the power line and the third line
Line modem, Control for controlling power line communication between the plurality of power line modems
Means, The network coupler, Multiple toroidal coils with polarity are toroidal cores
And one end of each toroidal coil integrates the polarity.
On the other hand, the toroidal coil is connected to the third wire.
The other end must not be connected to the power line side via a capacitor.
And the power line is high frequency with respect to the third line.
And the power line and the third line as communication paths.
Feature Power line communication device. 7.The power line is It consists of a single-phase power line that transmits single-phase AC power
Claim 6 Power line communication device. 8.The power line is Characterized by a multi-phase power line that transmits multi-phase AC power
Claim 6 Power line communication device. 9.The third line is 7. The method according to claim 6, comprising a ground line. Power line
Communication device. 10.The third line is Consist of conductors or telephone wires not connected to the ground wire
7. The method according to claim 6, wherein Power line communication device. 11.The plurality of power line modems, One main power line modem, A plurality of sub-power line modems, Consisting of The plurality of sub power line modems, Connected to information collection and control equipment via input / output control unit
And The main power line modem is Connected to the control means, and controlled by the control means.
The information collection control device through a plurality of sub power line modems
7. A power line communication is performed between the control unit and the terminal.
Stated Power line communication device. 12.The control means includes: Connected to a general line via a general line modem
With the above information collection control device via the sub power line modem
The information obtained by power line communication between Send to
The method according to claim 11, wherein Power line communication device. 13. The control means is connected to a general line via a general line modem.
Through the multiple sub-power line modems
And sends the information to the information collection control device.
The power line communication device according to claim 11 .