JP2005236461A - Power line communication network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To configure a power line communication network capable of communicating between different power lines by simply superposing a power line communication signal. <P>SOLUTION: The power line communication network comprises three or more power lines 41-43, terminals A and B connected, respectively, with at least two power lines 42 and 43 to perform communication with each other, and first couplers 44 and 45 performing high frequency coupling of the power lines 41-43. The first couplers 44 and 45 comprise a first magnetic core 44a inserted with one power line 42 and a second magnetic core 44c inserted with another power line 41, and first and second conductor lines 44b and 45b wound around the first and second magnetic cores, respectively, wherein the first and second conductor lines 44b and 44d are connected to form a loop. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power line communication network that enables easy communication between different power lines.

  A conventional power line communication network using a three-phase three-wire power line will be described with reference to FIG. The terminal A is connected between the R-phase power line 10 and the S-phase power line 20, the terminal B is connected between the S-phase power line 20 and the T-phase power line 30, and the T-phase power line 30 and the R-phase power line 30 are connected. Terminal C is connected between the power line 10 and the power line 10.

  A coupling circuit 100 is connected between the R-phase power line 10, the S-phase power line 20, and the T-phase power line 30. The coupling circuit 100 includes a first capacitor C1, a second capacitor C2, and a transformer T that block low-frequency components. The transformer T includes a primary coil L1 and a secondary coil L2.

  That is, the R-phase power line 10 and the S-phase power line 20 are connected via a series circuit including the first capacitor C1 and the primary coil L1 of the transformer T, and the S-phase power line 20 and the T-phase power line 20 are connected to each other. The power line 30 is connected via a series circuit including a secondary coil L2 of the transformer T and a second capacitor C2. The T-phase power line 30 and the R-phase power line 10 are connected via a second capacitor C2, a transformer T, and a first capacitor C1.

  Accordingly, the terminal A connected between the R-phase power line 10 and the S-phase power line 20, the terminal B connected between the S-phase power line 20 and the T-phase power line 30, and the T-phase power line 30. And power line communication with the terminal C connected between the R-phase power line 10 (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 07-235897 (FIG. 1).

  In the above configuration, power line communication is possible between any two of the three-phase three-wire power lines by connecting a transformer between the power lines, but wiring work for connecting the transformer becomes complicated.

  It is an object of the present invention to construct a power line communication network that enables communication by simply superimposing power line signals between different power lines.

  The power line communication network of the present invention includes three or more power lines, a terminal device that is coupled to at least two of the power lines and communicates with each other, and a first coupling device that couples the power lines to each other at high frequency. The first coupling device includes: a first magnetic core into which one of the power lines is inserted; a second magnetic core into which the other one of the power lines is inserted; The first and second conductor wires wound around two magnetic cores are connected to each other to form a loop.

  The power line is a single-phase three-wire power line composed of a ground power line and two non-ground power lines.

  The power line is a three-phase four-wire power line including a ground power line and three non-ground power lines.

  Further, the terminal device is connected between the ground power line and one of the three non-ground power lines, and between the ground power line and the other one of the three non-ground power lines. did.

  The terminal device is coupled to each ungrounded power line through a second coupling device.

  The second coupling device includes a third magnetic core through which each of the ungrounded power lines is inserted and a third conductor wire wound around the third magnetic core, and the third conductor The terminal device was connected to a line.

  Each magnetic core is composed of a two-part ferrite core divided into two parts.

  According to the power line communication network of claim 1, the first coupling device includes a first magnetic core through which one of the power lines is inserted, and a second magnet through which the other one of the power lines is inserted. Since the core and the first and second conductor wires wound around the first and second magnetic cores, respectively, are connected to the first conductor wire and the second conductor wire to form a loop. The terminal devices can communicate with each other via different power lines.

  According to the power line communication network of claim 2, since the power line is a single-phase three-wire power line composed of a ground power line and two non-ground power lines, the power line for power drawn into the home Can be used to communicate between terminal devices.

  Moreover, according to the power line communication network according to claim 3, since the power line is a three-phase four-wire power line composed of a ground power line and three non-ground power lines, it is generally popular in China. Communication is also possible with power lines.

  According to the power line communication network of claim 4, the terminal device is connected between the ground power line and one of the three non-ground power lines, and between the ground power line and the three non-ground power lines. Since it is connected to the other one, communication using a grounding wire can be performed.

  Moreover, according to the power line communication network according to claim 5, since the terminal device is coupled to each non-ground power line via the second coupling device, communication can be performed using the ground power line and the non-ground power line. .

  According to the power line communication network according to claim 6, the second coupling device includes the third magnetic core through which each ungrounded power line is inserted and the third magnetic core wound around the third magnetic core. Since it consists of conductor lines and the terminal device is connected to the third conductor line, communication can be performed using only the ungrounded power line.

  According to the power line communication network of the seventh aspect, since each magnetic core is composed of the two-divided ferrite core divided into two, each coupling device can be easily coupled to the power line.

  The power line communication network of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment using a single-phase three-wire power line for household power. In FIG. 1, three power lines 41, 42, and 43 are connected to a single-phase transformer 40. The ground power line 41 connected to the neutral point of the single-phase transformer 40 is grounded, and the other ungrounded power lines 42 and 43 are not grounded. The voltage between the ground power line 41 and one non-ground power line 42 and the voltage between the ground power line 41 and the other non-ground power line 43 are equal to each other, and the voltage between the two non-ground power lines 42 and 43 is the same. Is twice that.

  The non-ground power line 42 and the ground power line 41, and the non-ground power line 43 and the ground power line 41 are mutually coupled in high frequency by the first coupling devices 44 and 45, respectively. One first coupling device 44 includes an annular first magnetic core 44a through which the ungrounded power line 42 is inserted, a first conductor wire 44b wound around the first magnetic core 44a, and a second magnetic core 41 through which the ground power line 41 is inserted. Magnetic core 44c and a second conductor wire 44d wound around the magnetic core 44c, and the first conductor wire 44b and the second conductor wire 44d are interconnected so as to form a closed loop.

  The other first coupling device 45 has an annular first magnetic core 45a through which the ground power line 41 is inserted, a first conductor wire 45b wound around the first magnetic core 45a, and an ungrounded power line 43 inserted therethrough. It has the 2nd magnetic core 45c and the 2nd conductor wire 45d wound around it, and the 1st conductor wire 45b and the 2nd conductor wire 45d are mutually connected so that a closed loop may be constituted.

  The terminal devices A and B are coupled to the ungrounded power lines 42 and 43 via the second coupling devices 46 and 47, respectively. One second coupling device 46 includes a third magnetic core 46a through which the ungrounded power line 42 is inserted and a third conductor wire 46b wound around the third magnetic core 46a. The terminal device A is connected to the third conductor wire 46b. Is connected. Similarly, the other second coupling device 47 has a third magnetic core 47a through which the ungrounded power line 43 is inserted and a third conductor wire 47b wound around the third magnetic core 47a. Is connected to a terminal device B for mutual communication with the terminal device A.

  According to the above configuration, for example, a signal output from the terminal device A flows into the third conductor line 46b of the second coupling device 46, and this is superimposed on the non-grounded power line 42 via the third magnetic core 46a. The The signal superimposed on the non-grounded power line 42 is induced on the grounded power line 41 through one of the first coupling devices 44. That is, the signal superimposed on the ungrounded power line 42 is induced to the first conductor line 44b via the first magnetic core 44a and flows to the second conductor line 44d. Then, it is superimposed on the ground power line 41 via the second magnetic core 44c.

  The signal superimposed on the ground power line 41 is superimposed on the non-ground power line 43 by the other first coupling device 45. The signal superimposed on the non-grounded power line 43 is induced in the third conductor line 47 b of the other second coupling device 47 and input to the terminal device B. Therefore, communication between the terminal devices A and B is possible.

  2 and 3 show a second embodiment using a three-phase four-wire power line. First, in FIG. 2, three power lines 51, 52, 53 and 54 are connected to the three-phase transformer 50. The ground power line 51 connected to the neutral point of the three-phase transformer 50 is grounded, and the other non-ground power lines 52, 53, and 54 are not grounded. The voltages between the ground power line 51 and the other non-ground power lines 52, 53, 54 are equal to each other, and the voltage between the non-ground power lines 52, 53, 54 is √3 times that.

  The non-grounded power lines 52 to 54 are mutually coupled in high frequency by the first coupling devices 44 and 45, respectively. One first coupling device 44 includes an annular first magnetic core 44a through which a non-ground power line 52 is inserted, a first conductor wire 44b wound around the first magnetic core 44a, and a first magnetic core 44a through which a non-ground power line 53 is inserted. Two magnetic cores 44c and a second conductor wire 44d wound around the magnetic core 44c, and the first conductor wire 44b and the second conductor wire 44d are interconnected so as to form a closed loop.

  The other first coupling device 45 has an annular first magnetic core 45a through which the non-ground power line 53 is inserted, a first conductor wire 45b wound around the first magnetic core 45a, and an ungrounded power line 54 inserted therethrough. The second magnetic core 45c and the second conductor wire 45d wound around the second magnetic core 45c are interconnected so that the first conductor wire 45b and the second conductor wire 45d constitute a closed loop. .

  The terminal devices A, B, and C are coupled to the non-grounded power lines 52, 53, and 54 through the second coupling devices 46, 47, and 48, respectively. One second coupling device 46 includes a third magnetic core 46a through which the ungrounded power line 52 is inserted and a third conductor wire 46b wound around the third magnetic core 46a. The terminal device A is connected to the third conductor wire 46b. Is connected. Similarly, the other second coupling device 47 has a third magnetic core 47a through which the ungrounded power line 53 is inserted and a third conductor wire 47b wound around the third magnetic core 47a. Is connected to the terminal device A. The other second coupling device 48 includes a third magnetic core 48a through which the ungrounded power line 54 is inserted, and a third conductor wire 48b wound around the third magnetic core 48a. The third conductor wire 48b includes Terminal device C is connected. The terminal devices A to C are for mutual communication.

  According to the above configuration, for example, a signal output from the terminal device A flows to the third conductor line 46b of the second coupling device 46, and this is superimposed on the ungrounded power line 52 via the third magnetic core 46a. The The signal superimposed on the non-ground power line 52 is induced on the non-ground power line 53 via the first coupling device 44 on one side. That is, the signal superimposed on the non-grounded power line 52 is induced in the first conductor line 44b via the first magnetic core 44a and flows to the second conductor line 44d. Then, it is superimposed on the non-grounded power line 53 via the second magnetic core 44c. The signal superimposed on the non-ground power line 53 is superimposed on the non-ground power line 54 by the other first coupling device 45.

  Therefore, the signal superimposed on the non-grounded power line 53 is induced in the third conductor line 47 b of the other second coupling device 47 and input to the terminal device B. In addition, the signal superimposed on the non-grounded power line 54 is induced in the third conductor line 48 b of the other second coupling device 48 and is input to the terminal device C. Therefore, communication between the terminal devices A, B, and C becomes possible.

  FIG. 3 shows a configuration in which the terminal devices A to C are connected between the ground power line 51 and the non-ground power lines 52, 53, and 54, respectively, and the other configurations are the same as those in FIG.

  As shown in FIG. 4, each of the magnetic cores 44a to 48a is composed of two half-circular two-segment ferrite cores a1 and a2, which are housed in resin cases b1 and b2, and the resin case By providing locking means (not shown) at b1 and b2, the power lines are inserted into the annular magnetic cores 44a to 48a if the joining surfaces of the two-part ferrite cores a1 and a2 are matched. Is easy.

It is a block diagram which shows 1st Embodiment of the power line communication network of this invention. It is a block diagram which shows 2nd Embodiment of the power line communication network of this invention. It is a block diagram which shows the other example of 2nd Embodiment of the power line communication network of this invention. It is a block diagram of the magnetic core used for the power line communication network of this invention. It is a block diagram of the conventional power line communication network.

Explanation of symbols

40: Single-phase transformer 41: Grounded power line 42, 43: Ungrounded power line 44, 45: First coupling device 44a: First magnetic core 45a: Second magnetic core 44b: First conductor wire 45b: First Second conductor wire 46, 47, 48: Second coupling device 46a, 47a, 48a: Third magnetic core 46b, 47b, 48b: Third conductor wire 50: Three-phase transformer 51: Ground power line 52, 53 , 54: ungrounded power line A, B, C: terminal device a1, a2: split ferrite core

Claims (7)

Three or more power lines, a terminal device that is coupled to at least two of the power lines and communicates with each other, and a first coupling device that couples the power lines to each other at high frequency, The coupling device is wound around the first magnetic core into which one of the power lines is inserted, the second magnetic core into which the other one of the power lines is inserted, and the first and second magnetic cores, respectively. A power line communication network comprising a first conductor line and a second conductor line that are rotated, and a loop is formed by connecting the first conductor line and the second conductor line to each other. 2. The power line communication network according to claim 1, wherein the power line is a single-phase three-wire power line including a ground power line and two non-ground power lines. The power line communication network according to claim 1, wherein the power line is a three-phase four-wire power line including a ground power line and three ungrounded power lines. The terminal device is connected between the ground power line and one of the three non-ground power lines, and between the ground power line and the other one of the three non-ground power lines. The power line communication network according to claim 3. 5. The power line communication network according to claim 2, wherein the terminal device is coupled to each of the ungrounded power lines via a second coupling device. The second coupling device includes a third magnetic core through which each of the ungrounded power lines is inserted and a third conductor wire wound around the third magnetic core. The power line communication network according to claim 5, wherein the terminal device is connected. The power line communication network according to any one of claims 1 to 6, wherein each of the magnetic cores is configured by a two-part ferrite core divided into two.

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