JP4603404B2 - Power line communication system - Google Patents

Description

  The present invention relates to a power line communication system, and more particularly to a method for superimposing and extracting a high frequency signal by magnetic coupling to a plurality of power lines.

When constructing a communication system using a power line drawn into a home, a means for superposing a high-frequency signal (frequency band of 1 MHz to 30 MHz) on the power line is required. As a basic configuration in that case, there is a method of injection using a ferrite core 51 as shown in FIG. In this method, the power line 50 and the signal line 52 are sandwiched between the power lines 50 drawn into the home using the ferrite core 51, and the high frequency signal transmitted from the modem 53 via the signal line 52 is magnetically coupled to the power line. 50 is superimposed. When the modem 53 receives a high-frequency signal, the high-frequency signal superimposed on the power line 50 appears on the surface of the power line 50 due to the skin effect. Therefore, if the signal line 52 is sandwiched between the surfaces of the power line 50, Only the high frequency signal can be taken out by the magnetic coupling force.
Further, when a high frequency signal is superimposed on the branched power line, the high frequency signal transmitted from the modem 53 is distributed to the power lines 50 and 50a by the distributor 56, as shown in FIG. In this distribution method, the signal lines 52 and 52a are simply distributed in parallel from the distributor 56.
Incidentally, the Japanese power distribution system (TT system: see FIG. 10) is composed of three power lines: two power lines and a neutral line installed on the ground. Therefore, since the high frequency signal superimposed on the power line is always superimposed on one of the neutral line and the other power line, the high frequency signal can be always received by connecting the modem to a 100 V commercial power source.
FIG. 10 is a conceptual diagram of a TT system adopted in a Japanese power distribution system. The middle point of the secondary side of the pole transformer 40 is grounded by the ground line 41 to the ground. Therefore, the voltage at both ends of the transformer 40 (between the power lines 42 and 43) is 200V, but is 100V between the transformer 40 and the neutral line 44. And the electric power is integrated by the watt-hour meter 49 in a consumer through the breaker of the electric power company which is not shown in figure, and the 3-wire power line enters into the distribution board 45, and each household appliance via each breaker 45a, 45b, 45c 46, 47, 48. Therefore, for example, if the home appliance 46 is a PC, a modem in the PC can receive and communicate with a high-frequency signal superimposed on the power line 42 and the neutral line 44.
In addition, there is one disclosed in Patent Document 1 for injecting a signal with an electromagnetic induction coupling (magnetic coupling) circuit using a ferrite core.
JP 2004-032585 A

However, in the signal superposition method using the ferrite core shown in FIG. 8A, as shown in FIG. 9, the superposed high-frequency signal 55 is a signal 57 that flows in the direction of the opposite modem 54 and a signal that flows in the opposite direction. 56 exists, but the energy of the signal 56 flowing in the opposite direction hardly contributes to communication, which is a big problem in constructing an efficient system. In addition, a leakage electric field may be generated from the power line on the modem 53 side of the ferrite core 51 by the signal 56 flowing in the opposite direction.
When a high-frequency signal is superimposed on the branched power line shown in FIG. 8B (this method is referred to as method 1), if the number of branches increases, installation work takes time and the number of wires increases. Therefore, there are problems such that connection mistakes are likely to occur and the places where cables can be laid are limited.
In view of such problems, the present invention provides a power line communication system using a power line branched by a distribution board. When a high-frequency signal is superimposed on each power line by an injection unit, any one of the power lines in the same phase. By changing the wiring method of the signal line to be wired to the injection part, the high-frequency signal in the opposite direction flowing out from the injection part is efficiently guided to the opposite modem side, and a power line communication system with improved communication efficiency is provided. Objective.

In order to solve such a problem, the present invention provides a signal transmission / reception between a first transmitter / receiver and a plurality of second transmitters / receivers respectively connected to a plurality of divided power lines. A distribution board for performing power line communication in which a secondary side of a transformer for stepping down a voltage of a main power line, which is a high-voltage distribution line, and converting it to commercial power is divided into a plurality of power line pairs, and the distribution board respectively provided on the power lines constituting the pair of power lines of two systems of a pair of power lines that power distribution has been in phase by superimposes the signal to be transmitted, and Louis Njekushon unit to extract signals to be received, said first and a distributor for distributing a pair of signal lines formed in a loop shape that extends from one transceiver to the two systems, superimposes a high frequency signal through the injection portion to one of a pair of power lines of the power line pair of the two systems while the signal line for the other electric Characterized in that connected to the injection unit so that the other signal line for superimposing a high-frequency signal becomes different polarities via the injection unit to the wire pair.
Power line communication system of the present invention includes a distribution board to a plurality of power line pairs binary electrostatic power line pair on the secondary side of the transformer, a divider for dividing distribution of the high-frequency signal, the high frequency to each of the power line pair power distribution The power line communication system includes an injection unit that superimposes signals, distributes high-frequency signals transmitted from a modem by a distributor, and superimposes them on a power line via the injection unit, thereby transferring data between modems. However, when a high frequency signal is transmitted from the modem to the opposite modem, a signal that flows on the opposite side of the signal is generated in addition to the signal that flows from the injection unit to the opposite modem side. This signal is not only a signal that does not contribute to the communication with the opposite modem, but the signal flowing on the opposite side generates an unnecessary electric field, which causes a reduction in communication quality and communication efficiency. In this invention, in order to induce a signal flowing in the opposite side facing modem side, and the polarity of one of the signal lines allocated to one of a pair of power lines of the power line pair of two systems of the same phase, the other pair of power lines The other signal lines to be distributed to each other are connected so that their polarities are different from each other , and the signal flowing on the opposite side passes through the distribution board and is guided to the opposite modem side through one power line. Here, the modem refers to a modem provided on the side that transmits a high-frequency signal and superimposes the signal on the power line from the injection unit. The opposite modem refers to a modem that receives a high-frequency signal superimposed on a power line from the power line.
Claim 2 is a power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines, and a high voltage distribution line A distribution board that divides the secondary side of a transformer that converts the voltage of the main power line into commercial power by dividing the voltage into a plurality of power line pairs, and a power line pair of the same phase that is divided by the distribution board The first and second power lines that constitute two power line pairs, and the injection unit that superimposes the signal to be transmitted and extracts the signal to be received, from the first transceiver When the high-frequency signal is superimposed on the two power line pairs via the injection unit in a loop of a pair of signal lines formed in an extending loop shape, the signal line is one of the two power line pairs. The first power line of the power line pair Pass the injection part first and then the second power line injection part, and in the other power line pair, pass the second power line injection part first and then the first power line injection part. Wiring is performed, and loop wiring is performed to the injection unit such that the order of the wiring of the signal lines on which the high-frequency signal is superimposed via the injection unit is different between the two power line pairs.
If there is no distributor for distributing the high-frequency signal transmitted from the modem, a pair of signal lines from the modem are formed in a loop shape, and the order in which the loop passes through the injection section is changed. The effect of can be obtained. That is, the two power line pairs in the same phase are wired so as to pass through the injection part of the first power line of one power line pair first and then through the injection part of the second power line. Wiring the first power line through the injection part of the second power line first, and the wiring order of the signal lines for superimposing the high-frequency signals through the injection part in the two power line pairs The wiring is loop-wired to the injection part so as to be different.

Claim 3 is a power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers connected to a plurality of divided power lines, respectively. A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line into commercial power by dividing the voltage into a plurality of power line pairs, and a plurality of in- phase power lines that are divided by the distribution board pair and, respectively provided in the power lines constituting the plurality of power line pairs, by superimposing a signal to be transmitted, and Louis Njekushon unit to extract signals to be received, in a loop extending from said first transceiver A distributor for distributing a pair of formed signal lines, and superimposing a high-frequency signal on the power line pair in which the connection order from the upper part of the distribution board is odd among the plurality of power line pairs via an injection unit Signal lines and even power lines Characterized in that connected to the injection unit so that the signal line for superimposing a high-frequency signal becomes different polarities through the injection portion.
The power line communication system of the present invention includes a distribution board that distributes a power line pair on the secondary side of a transformer to a plurality of power line pairs, a distributor that distributes a high-frequency signal to a plurality of signal lines, and each of the divided power lines. A power line communication system comprising: an injection unit that superimposes a high frequency signal on a power line pair; and a high frequency signal transmitted from the modem is distributed by a distributor and superimposed on the power line via the injection unit, thereby transferring data between the modems It is. However, when a high frequency signal is transmitted from the modem to the opposite modem, a signal that flows on the opposite side of the signal is generated in addition to the signal that flows from the injection unit to the opposite modem side. This signal is not only a signal that does not contribute to the communication with the opposite modem, but the signal flowing on the opposite side generates an unnecessary electric field, which causes a reduction in communication quality and communication efficiency. Therefore, in the present invention, in order to guide the signal flowing on the opposite side to the opposite modem side, the power line pair in the same phase among the plurality of power line pairs is changed to a power line pair whose connection order from the upper part of the distribution board is an odd number. The polarity of the pair of signal lines to be distributed and the pair of signal lines to be distributed to the even numbered power line pairs are connected so that the polarities are different from each other. It is guided to the opposite modem side through one power line. Here, the modem refers to a modem provided on the side that transmits a high-frequency signal and superimposes the signal on the power line from the injection unit. The counter modem refers to a modem that receives a high-frequency signal superimposed on a power line from the power line.

Claim 4 is a power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines, and a high voltage distribution line A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line into commercial power by dividing the voltage into a plurality of power line pairs, and a plurality of in- phase power lines that are divided by the distribution board paired, respectively provided in the first and second power lines constituting the plurality of power line pairs, by superimposing a signal to be transmitted, comprising a Louis Njekushon unit to extract signals to be received, the said first When the high-frequency signal is superimposed on the plurality of power line pairs via the injection unit in a loop of a pair of signal lines formed in a loop extending from one transceiver, the signal lines are connected to the plurality of power line pairs. Connection from above the distribution board For power line pairs with an odd number, route the first power line through the injection part of the first power line and then pass through the injection part of the second power line. The wiring of the first power line is routed through the injection part, and the order of the wiring of the signal line that superimposes the high-frequency signal through the injection part in the plurality of power line pairs is connected from the upper part of the distribution board. It is characterized by loop wiring to the injection part so that the odd number and the even number are different from each other.
If there is no distributor that distributes the high-frequency signal transmitted from the modem, a pair of signal lines from the modem is formed in a loop shape, and the order in which the loop passes through the injection portions of the plurality of power line pairs may be changed. An effect similar to that of the third aspect can be obtained. In other words, in the power line pair in which the connection order from the upper part of the distribution board is an odd number to the power line pair in the same phase, the first power line injection part is passed first and then the second power line injection part is passed. For even-numbered power line pairs, first pass the injection part of the second power line and then pass the injection part of the first power line, and the wiring order of the signal lines is connected from the top of the distribution board The odd numbers and even numbers in the order are wired differently from each other.
Claim 5 is a power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines, and a high voltage distribution line A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line into commercial power by dividing the voltage into a plurality of power line pairs, and a plurality of in-phase power lines that are divided by the distribution board A pair, an injection unit that is provided in each of the first and second power lines constituting the plurality of power line pairs, superimposes a signal to be transmitted and extracts a signal to be received, and extends from the first transceiver A distributor that distributes a pair of signal lines formed in a loop, and a plurality of signal lines distributed in the distributor share the plurality of power line pairs and superimpose the high-frequency signal. , More than 2 pairs of distributed signal lines When the high-frequency signal is superimposed on the force line pair via the injection unit, the signal line is the first power line pair in which the connection order from the upper part of the distribution board is an odd number among the plurality of power line pairs. Pass through the injection part of the first power line first, then pass through the injection part of the second power line, and in the even-numbered power line pair, pass the injection part of the second power line first and then the first power line. Wiring to pass through the injection unit, and in the plurality of power line pairs, the order of the wiring of the signal line that superimposes the high-frequency signal through the injection unit is an odd number and an even number in the connection order from the upper part of the distribution board It is characterized by loop wiring to the injection part so as to be different from each other.
When the three-line power line is divided into the two-line power line by the distribution board, a plurality of power line pairs having the same phase can be formed by using one neutral line in common. And in the power line pair in which the connection order from the upper part of the distribution board is an odd number through the power line pair in the same phase of each power line, first pass the injection part of the first power line and then pass the injection part of the second power line. In the even numbered power line pair, first pass the injection part of the second power line and then pass the injection part of the first power line, and the order of signal line wiring from the top of the distribution board Wiring is performed so that the odd number and the even number in the connection order are different from each other. In order to configure a plurality of power line pairs of these combinations, the signal lines are distributed in parallel from the distributor.

According to the present invention, in order to induce a signal flow in the opposite side to the opposing modem side, and the polarity of the pair of signal lines to be distributed to one of a pair of power lines of the power line pair of two systems of the same phase, and the other of the connections differently polarities of the pair of signal lines for distributing the power line pair, since signals flow in the opposite side is guided to the opposite modem side through one of the power line through the distribution board, opposite The signal flowing to the side passes through the distribution board and is guided to the opposite modem side via one power line, so that the communication efficiency can be increased and the generation of a leakage electric field from the power line existing in the opposite direction to the opposite modem. Noise can be reduced.
According to a second aspect of the present invention, when there is no distributor that distributes the high-frequency signal transmitted from the modem, a pair of signal lines from the modem are formed in a loop shape , and the injection section of the two power line pairs having the same phase in the loop since changing the order of wires in, without the distributor can bypass the signal flowing efficiently opposite the opposing modem side, it is possible to construct a cost cheaper system.
According to a third aspect of the present invention, in order to guide a signal flowing on the opposite side to the opposite modem side, the order of connection from the upper part of the distribution board to the plurality of power line pairs in the same phase among the plurality of power line pairs is an odd number. The polarity of the pair of signal lines distributed to the power line pair and the polarity of the pair of signal lines distributed to the even numbered power line pair are connected to each other so that the signals flowing on the opposite side pass through the distribution board. Therefore, the signal flowing to the opposite modem side is guided to the opposite modem side through one power line, so that the signal flowing through the distribution board is guided to the opposite modem side via one power line, and the communication efficiency can be improved. It is possible to reduce the generation of leakage electric field and noise from the power line existing in the opposite direction to the opposite modem.
According to a fourth aspect of the present invention, when there is no distributor for distributing the high-frequency signal transmitted from the modem, a pair of signal lines from the modem is formed in a loop shape, and the connection order from the upper part of the distribution board is an odd number. Since the order of wiring to the injection section is changed between the power line pair of the number and the power line pair of the even number, the signal that flows efficiently to the opposite side can be bypassed to the opposite modem side even without a distributor, and the system is low in cost. Can be configured.
Further, according to claim 5, when the three-wire power line is divided into the two-wire power line by the distribution board, a plurality of in-phase power line pairs are configured by using one neutral line in common, and each power line pair The order in which high-frequency signals are distributed to the injection units provided in the power lines in which the connection order from the upper part of the distribution board is odd-numbered to the power line pairs in the same phase is different from the order of even-numbered power line pairs. Therefore, when a power line pair is added, an injection unit can be easily added by adding a signal line in parallel from the distributor.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is a configuration diagram of a power communication system according to the first embodiment of the present invention. In this power communication system 100, the secondary side of a pole transformer (transformer) 32 that steps down the voltage of the main power line 30 that is a high-voltage distribution line and converts it into commercial power is referred to as a plurality of power line pairs (hereinafter simply referred to as power lines). And a plurality of injections for extracting signals to be received by superimposing signals to be transmitted on the respective power lines 2a-3a and 2b-3b divided by the distribution board 10 A distributor 5 that distributes the high-frequency signal 9 to the plurality of injection sections 7 by a section 7 (7a to 7d) and a pair of signal lines 6a and 6b formed in a loop shape, and a high-frequency signal 9 to be transmitted to the injection section 7 The modem 4 is configured to be transmitted via the signal line 6, and the opposite modems 8 and 8 a are configured to transmit and receive signals to and from the modem 4.
One of the secondary low-voltage distribution lines 2 and 3 (low-voltage distribution line 2 in this example) of the pole transformer 32 that lowers the voltage of the high-voltage distribution line (6600 V) 30 to the commercial voltage (100 V) is the ground line 34. (The low-voltage distribution line 2 is also called a neutral wire). Although not shown, this system is connected from the low voltage distribution lines 2 and 3 of the pole transformer 32 via a breaker of an electric power company. The injection part 7 is composed of ferrite cores 7a to 7d, the ferrite core 7a sandwiches the low-voltage distribution line 2a and the signal line 6a, the ferrite core 7b sandwiches the low-voltage distribution line 3a and the signal line 6a, and the ferrite core 7c is low-pressure The distribution line 2b and the signal line 6b are sandwiched, and the ferrite core 7d sandwiches the low-voltage distribution line 3b and the signal line 6b. The two signal lines of the modem 4 are connected in parallel to a pair of signal lines 6a and 6b by a distributor 5, and the tip of the signal line 6a is sandwiched between ferrite cores 7a and 7b to form a loop. The tip of the signal line 6b is sandwiched between the ferrite cores 7d and 7c and is alternately connected to the signal line 6a to form a loop. In this example, the signal lines 6a and 6b are alternately wired by the distributor 5. . The opposite modems 8 and 8a are connected to secondary power lines 2a-3a and 2b-3b, respectively (this method is called method 2).

Next, the operation of the power communication system according to the embodiment of the present invention will be described. The high-frequency signal 9 sent from the modem 4 is input to the injection unit 7 via the signal lines 6a and 6b. In the injection section 7, since the signal line 6a is sandwiched between the ferrite cores 7a and 7b and the low-voltage distribution lines 2a and 3a are also sandwiched, there is no magnetic force between the signal line 6a and the low-voltage distribution lines 2a and 3a. Coupling occurs and the high frequency signal 9a is superimposed on the low voltage distribution line 3a. The high-frequency signal 9a flows as signals 9a and 9c from the ferrite core 7b to both sides of the low-voltage distribution line 3a. The signal 9 a is an original signal that flows toward the opposite modem 8, but the signal 9 c tends to flow on the opposite side of the opposite modem 8. However, since there is a distribution board 10 in the middle, and the low-voltage distribution lines 3a and 3b are connected by the distribution board 10, the signal 9c is input to the distribution board 10 and is superimposed on the low-voltage distribution line 3b to generate the signal 9c. To the opposite modem 8a side. Then, the signal 9c is combined with the signal 9b, and an effect equivalent to a state in which the transmission output is increased by 5 to 6 dB (an actual measurement result will be described later) can be obtained.
Similarly, in the injection section 7, since the signal line 6b is sandwiched between the ferrite cores 7c and 7d and the low-voltage distribution lines 2b and 3b are also sandwiched, the signal line 6b and the low-voltage distribution lines 2b and 3b Magnetic coupling occurs between them, and the high-frequency signal 9b is superimposed on the low-voltage distribution line 2b. The high-frequency signal 9b flows as signals 9b and 9d from the ferrite core 7c to both sides of the low-voltage distribution line 2b. The signal 9b is an original signal that flows toward the opposite modem 8a, but the signal 9d tends to flow on the opposite side to the opposite modem 8a. However, since there is a distribution board 10 in the middle, and the low voltage distribution lines 2b and 2a are connected by the distribution board 10, the signal 9d is input to the distribution board 10 and is superimposed on the low voltage distribution line 2a to generate the signal 9d. To the opposite modem 8 side. Then, the signal 9d is combined with the signal 9a, and an effect equivalent to a state in which the transmission output is increased by 5 to 6 dB (an actual measurement result will be described later) can be obtained.

  As described above, the power line communication system 100 of the present invention includes the distribution board 10 that divides the power line 2-3 on the secondary side of the pole transformer 32 into the plurality of power lines 2a-3a and 2b-3b, and the high-frequency signal 9. Is distributed by the signal line 6 and the injection unit 7 that superimposes the high frequency signal 9 on each of the divided power lines 2a-3a, 2b-3b, and the high frequency signal 9 transmitted from the modem 4 is distributed. 5 is a power line communication system in which data is exchanged between modems by being distributed by 5 and superimposed on power lines 2a-3a and 2b-3b via an injection unit 7. However, when transmitting a high frequency signal from the modem 4 to the opposite modem 8, 8a, in addition to the signals 9a, 9b flowing from the injection unit 7 to the opposite modem 8, 8a side, a signal 9c flowing to the opposite side of the signal 9a, 9b, 9d occurs. These signals 9c and 9d are not only signals that do not contribute to the communication with the opposite modems 8 and 8a, but the signals flowing on the opposite side generate unnecessary electric fields, thereby reducing communication quality and communication efficiency. It is a factor. Therefore, in the present embodiment, a pair of signals distributed to one of the power lines of the same phase (2b-3b in this example) in order to induce the signals 9c and 9d flowing on the opposite side to the opposite modems 8 and 8a. The polarity of the line 6b and the polarity of the pair of signal lines 6a distributed to the power lines 2a-3a are alternately connected, so that the signals 9c and 9d flowing on the opposite side pass through the distribution board 10 and become one of the power lines. It is guided to the opposite modems 8 and 8a via 2a and 3b. As a result, the signals 9c and 9d flowing on the opposite side pass through the distribution board 10 and are guided to the opposite modems 8 and 8a via one power line, so that the communication efficiency can be improved and the opposite modems 8 and 8a can be improved. It is possible to reduce the generation of leakage electric field and noise from the power line existing in the opposite direction.

FIG. 2 is a configuration diagram of a power communication system according to the second embodiment of the present invention. The same components will be described with the same reference numerals. In this power communication system 110, the secondary side of a pole transformer (transformer) 32 (not shown) that steps down the voltage of the main power line 30 that is a high-voltage distribution line and converts it into commercial power is divided into a plurality of power lines. And a plurality of injection units 7 (7a) that superimpose a signal to be transmitted on each of the power lines 2a-3a and 2b-3b divided by the distribution board 10 and extract a signal to be received. ˜7d), a modem 4 that transmits the high-frequency signal 9 to be transmitted to the injection unit 7 through the signal line 6, and the opposite modems 8 and 8a that transmit and receive signals to and from the modem 4.
The configuration before the low-voltage distribution lines 2 and 3 is the same as that shown in FIG. The injection section 7 is composed of ferrite cores 7a to 7d, the ferrite core 7a sandwiches the low-voltage distribution line 2a and the signal line 6, the ferrite core 7b sandwiches the low-voltage distribution line 3a and the signal line 6, and the ferrite core 7c is low-pressure The distribution line 2b and the signal line 6 are sandwiched, and the ferrite core 7d sandwiches the low-voltage distribution line 3b and the signal line 6. The signal line 6 is formed in a loop shape and wired so that the loop returns to the modem 4 in the order of the ferrite cores 7a-7b-7d-7c. The opposite modems 8 and 8a are connected to the secondary power lines 2a-3a and 2b-3b, respectively. That is, FIG. 2 differs from FIG. 1 in that the distributor is eliminated and the loop of the signal line 6 coming out of the modem 4 is wired so as to return to the modem 4 in the order of ferrite cores 7a-7b-7d-7c. Is a point. Since the operation is the same as that of the first embodiment, description thereof is omitted (this method is referred to as method 3).
When there is no distributor for distributing the high-frequency signal 9 sent from the modem 4 in this way, a pair of signal lines 6 from the modem 4 are formed in a loop shape, and the loop passes through the ferrite core in the injection unit 7. Even if the order is changed, the same effect as the first embodiment can be obtained. That is, the order in which the high-frequency signals are distributed to the ferrite cores in the injection section on one of the power lines in the same phase is different from the order in which the high-frequency signals are distributed to the ferrite cores in the injection section on the other power lines. It is a thing. Thereby, even if the distributor 5 is not provided, the signals 9c and 9d flowing on the opposite side can be bypassed to the opposite modems 8 and 8a side, and the system can be configured at low cost.

  FIG. 3 is a diagram showing attenuation characteristics comparing the method 1 (conventional method), the method 2 and the method 3. The vertical axis represents attenuation (dB), and the horizontal axis represents frequency (MHz). Reference numeral 11 is a characteristic of system 1 (conventional system), reference numeral 12 is a characteristic of system 2, and reference numeral 13 is a characteristic of system 3. As is apparent from this figure, it can be seen that the attenuation of about 7 to 8 dB is smaller in the systems 2 and 3 than in the system 1 at 10 MHz. In addition, it can be seen that, even at 40 MHz, systems 2 and 3 have a reduced attenuation of about 4.5 to 5.5 dB compared to system 1. At 40 MHz, the method 2 has a smaller attenuation of about 1 dB than the method 3. However, Method 3 eliminates the need for a distributor, which can reduce costs and eliminates the need for wiring work to the distributor, thereby reducing the burden on installation work. Accordingly, which of the methods 2 and 3 is selected is determined based on the balance between cost and performance.

FIG. 4 is a configuration diagram of a power communication system according to the third embodiment of the present invention. The same components will be described with the same reference numerals. The power communication system 120 includes a plurality of secondary (3, 1, 2, 3) lines on the secondary side of a pole transformer (transformer) 32 that steps down the voltage of the main power line 30 that is a high-voltage distribution line and converts it into commercial power. The power distribution board 10 that distributes power to the power lines of the power distribution circuit 10 and the signals to be transmitted are superimposed and received on the power lines 1a-2a, 1b-2b, 1c-2c, and 1d-2d that are divided by the distribution board 10. A high frequency signal (not shown) is distributed to the plurality of injection units 7 by a plurality of injection units 7 (7a to 7h) for extracting power signals and a pair of signal lines 6a, 6b, 6c, 6d formed in a loop shape. A distributor 5, a modem 4 that transmits a high-frequency signal to be transmitted to the injection unit 7 via the signal line 6, and an opposite modem (not shown) that transmits and receives signals to and from the modem 4 are configured. .
Note that the low-voltage distribution line 2 on the secondary side of the pole transformer 32 that steps down the voltage of the high-voltage distribution line (6600 V) 30 to the commercial voltage (100 V) is grounded by the ground line 34. Although not shown, the system is connected from the low-voltage distribution lines 1, 2, and 3 of the pole transformer 32 via a breaker of an electric power company. The injection part 7 is composed of ferrite cores 7a to 7h, the ferrite core 7a sandwiches the low-voltage distribution line 1a and the signal line 6a, the ferrite core 7b sandwiches the low-voltage distribution line 2a and the signal line 6a, and the ferrite core 7c is low-pressure The distribution line 1b and the signal line 6b are sandwiched, the ferrite core 7d sandwiches the low-voltage distribution line 2b and the signal line 6b, the ferrite core 7e sandwiches the low-voltage distribution line 1c and the signal line 6c, and the ferrite core 7f is connected to the low-voltage distribution line 2c and the signal The ferrite core 7g sandwiches the low voltage distribution line 1d and the signal line 6d, and the ferrite core 7h sandwiches the low voltage distribution line 2d and the signal line 6d. A pair of signal lines 6a, 6b, 6c and 6d are connected in parallel to the two signal lines 6 of the modem 4 by the distributor 5, and the signal line 6a is sandwiched between the ferrite cores 7a and 7b to form a loop. Has been. The signal line 6b is sandwiched between the ferrite cores 7d and 7c, and is alternately connected to the signal line 6a to form a loop. The signal line 6c is sandwiched between the ferrite cores 7e and 7f and configured in a loop shape. The signal line 6d is sandwiched between the ferrite cores 7g and 7h, and is alternately connected to the signal line 6c to form a loop (this method is referred to as method 4).

FIG. 5 is a configuration diagram of a power communication system according to the fourth embodiment of the present invention. The same components will be described with the same reference numerals. The power communication system 130 includes a distribution board 10 that divides commercial power three lines (1, 2, 3) into a plurality of power lines, and power lines 1a-2a, 1b that are divided by the distribution board 10. -2b, 1c-2c, 1d-2d, a plurality of injection units 7 (7a to 7h) for extracting signals to be received and signals to be transmitted to the injection unit 7 are signal lines. 6 and a modem 4 for transmitting via the modem 6 and an opposing modem (not shown) for transmitting and receiving signals to and from the modem 4.
In addition, since the structure before the low voltage distribution lines 1, 2, and 3 is the same as FIG. 4, illustration is abbreviate | omitted. The injection part 7 is composed of ferrite cores 7a to 7h, the ferrite core 7a sandwiches the low-voltage distribution line 1a and the signal line 6, the ferrite core 7b sandwiches the low-voltage distribution line 2a and the signal line 6, and the ferrite core 7c is low-pressure The distribution line 1b and the signal line 6 are sandwiched, the ferrite core 7d sandwiches the low-voltage distribution line 2b and the signal line 6, the ferrite core 7e sandwiches the low-voltage distribution line 1c and the signal line 6, and the ferrite core 7f is connected to the low-voltage distribution line 2c and the signal The ferrite core 7g sandwiches the low-voltage distribution line 1d and the signal line 6, and the ferrite core 7h sandwiches the low-voltage distribution line 2d and the signal line 6. The signal line 6 is formed in a loop shape and wired so that the loop returns to the modem 4 in the order of the ferrite cores 7a-7b-7d-7c. That is, FIG. 5 differs from FIG. 4 in that the distributor is eliminated and the loop of the signal line 6 coming out of the modem 4 is in the order of ferrite cores 7a-7b-7d-7c-7e-7f-7h-7g. It is the point wired so that it may return. Since the operation is the same as that of the first embodiment, description thereof is omitted (this method is called method 5).

FIG. 6 is a configuration diagram of a power communication system according to the fifth embodiment of the present invention. The same components will be described with the same reference numerals. This power communication system 140 includes a distribution board 10 that distributes three commercial power lines to a plurality of power lines (1, 2, 3), and power lines 1a-2a, 1b that are divided by the distribution board 10 respectively. -B, 1c-2c, 1d-2d, a plurality of injection units 7 (7a to 7h) for extracting a signal to be received and a signal to be received, and a high-frequency signal to be transmitted to the injection unit 7 A modem 4 for transmitting via signal lines 6a and 6b, a distributor 5 for distributing a high-frequency signal (not shown) to a plurality of injection sections 7 by a pair of signal lines 6a and 6b formed in a loop, and a modem 4 And an opposite modem (not shown) for transmitting and receiving signals.
In addition, since the structure before the low voltage distribution lines 1, 2, and 3 is the same as FIG. 4, illustration is abbreviate | omitted. The injection part 7 is composed of ferrite cores 7a to 7h, the ferrite core 7a sandwiches the low-voltage distribution line 1a and the signal line 6a, the ferrite core 7b sandwiches the low-voltage distribution line 2a and the signal line 6a, and the ferrite core 7c is low-pressure The distribution line 1b and the signal line 6a are sandwiched, the ferrite core 7d sandwiches the low-voltage distribution line 2b and the signal line 6a, the ferrite core 7e sandwiches the low-voltage distribution line 1c and the signal line 6b, and the ferrite core 7f is connected to the low-voltage distribution line 2c and the signal The ferrite core 7g sandwiches the low-voltage distribution line 1d and the signal line 6b, and the ferrite core 7h sandwiches the low-voltage distribution line 2d and the signal line 6b. The two signal lines 6 of the modem 4 are connected in parallel by a distributor 5 to a pair of signal lines 6a and 6b. The signal line 6a is formed in a loop shape, and the loop is formed of a ferrite core 7a-7b-7d-. It is wired so as to return to the modem 4 in the order of 7c. The signal line 6b is formed in a loop shape and wired so that the loop returns to the modem 4 in the order of ferrite cores 7e-7f-7h-7g. That is, FIG. 6 is different from FIG. 5 in that a pair of signal lines 6 is divided into two sets by a distributor, and the loop of the signal line 6a from the modem 4 is in the order of ferrite cores 7a-7b-7d-7c. The loop of the signal line 6b is wired so as to return to the modem 4 in the order of ferrite cores 7e-7f-7h-7g. Since the operation is the same as that of the first embodiment, the description is omitted (this method is referred to as method 6).
When power lines are added by making the order of distributing high-frequency signals to the injection unit provided in one of the power lines in the same phase of each power line different from the order of the other power line as described above By adding a signal line from the distributor 5 in parallel, the injection unit can be easily added.

  FIG. 7 is a diagram showing attenuation characteristics comparing the method 4, the method 5 and the method 6 of the present invention. The vertical axis represents attenuation (dB), and the horizontal axis represents frequency (MHz). Reference numeral 21 is a characteristic of the method 4, reference numeral 22 is a characteristic of the method 5, and reference numeral 23 is a characteristic of the method 6. As is clear from this figure, at 10 MHz, the amount of attenuation increases in the order of method 5, method 4, and method 6, and it can be seen that there is a difference. At 40 MHz, methods 4 and 6 show substantially the same characteristics, but it can be seen that method 5 has an attenuation of about 4 dB larger than that. Therefore, it can be seen that the method 6 has the best characteristics over the frequency range of 10 MHz to 40 MHz.

1 is a configuration diagram of a power communication system according to a first embodiment of the present invention. It is a block diagram of the electric power communication system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the attenuation | damping characteristic which compared the system 1 (conventional system), the system 2, and the system 3. FIG. It is a block diagram of the electric power communication system which concerns on the 3rd Embodiment of this invention. It is a block diagram of the electric power communication system which concerns on the 4th Embodiment of this invention. It is a block diagram of the electric power communication system which concerns on the 5th Embodiment of this invention. It is a figure which shows the attenuation | damping characteristic which compared the system 4, the system 5, and the system 6 of this invention. It is a figure explaining the method of injecting using the conventional ferrite core. It is a figure for demonstrating the problem in a conventional system. It is a conceptual diagram of the TT system employ | adopted as the power distribution system of Japan.

Explanation of symbols

  1, 2, 3 Low voltage distribution line, 1-2, 2-3 Power line, 4 Modem, 5 Distributor, 6a, 6b A pair of signal lines, 7 (7a-7d) Injection section, 8, 8a Opposite modem, 9 High frequency Signal, 10 distribution board, 30 main power line, 32 pole transformer, 100 power communication system

Claims (5)

A power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines,
A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line, which is a high-voltage distribution line, into commercial power and distributes it to a plurality of power line pairs, and the same phase that is divided by the distribution board respectively provided on the power lines constituting the pair of power lines of two systems of power line pair superimposes the signal to be transmitted, and Louis Njekushon unit to extract signals to be received, the loop shape extending from said first transceiver A distributor for distributing the pair of signal lines formed in 2 to two systems ,
One signal line that superimposes a high-frequency signal on one power line pair of the two power line pairs via an injection unit, and the other signal line that superimposes a high-frequency signal on the other power line pair via an injection unit A power line communication system characterized by being connected to an injection unit so as to have different polarities. A power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines,
A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line, which is a high-voltage distribution line, into commercial power and distributes it to a plurality of power line pairs, and the same phase that is divided by the distribution board respectively provided on the first and second power lines constituting the pair of power lines of two systems of power line pair superimposes the signal to be transmitted, comprising a Louis Njekushon unit to extract signals to be received, and
If superimposing the high-frequency signal into the loop of the pair of signal lines formed in a loop through the front listening Njekushon unit to the power line pair of the two systems extending from the first transceiver,
Said signal line, said second wiring to pass the injection portion of the power line from through the injection portion of the first power line of the power line pair of the power line pairs No Chi hand two systems above, the other pair of power lines signal line Oite is that wiring to pass the injection portion of the first power line from through the above the injection portion of the second power line, to superimpose the high-frequency signal via the injection unit in the power line pair of the two systems A power line communication system, characterized in that loop wiring is performed to the injection unit so that the order of the wirings is different from each other . A power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines,
A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line, which is a high-voltage distribution line, into commercial power and distributes it to a plurality of power line pairs, and the same phase that is divided by the distribution board a plurality of power line pairs, respectively provided in the power lines constituting the plurality of power line pairs, by superimposing a signal to be transmitted, and Louis Njekushon unit to extract signals to be received, extending from the first transceiver comprising a distributor for distributable a pair of signal lines formed in a loop shape, and
Among the plurality of power line pairs, a signal line for superimposing a high frequency signal via an injection unit on a power line pair whose connection order from the upper part of the distribution board is an odd number via an injection unit, and an injection unit on an even numbered power line pair The power line communication system is characterized in that the signal line on which the high frequency signal is superimposed is connected to the injection unit so that the polarities are different from each other . A power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines,
A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line, which is a high-voltage distribution line, into commercial power and distributes it to a plurality of power line pairs, and the same phase that is divided by the distribution board A plurality of power line pairs; and an injection unit that is provided in each of the first and second power lines constituting the plurality of power line pairs, superimposes a signal to be transmitted, and extracts a signal to be received;
When superimposing the high-frequency signals on the plurality of power line pairs through the injection unit in a loop of a pair of signal lines formed in a loop extending from the first transceiver,
In the power line pair in which the connection order from the upper part of the distribution board among the plurality of power line pairs is odd-numbered, the signal line is passed through the injection part of the first power line first, and then the injection part of the second power line The power line pairs that are even numbers are routed through the injection part of the first power line before passing through the injection part of the first power line, and the plurality of power line pairs are connected via the injection part. A power line communication system , characterized in that loop wiring is performed to the injection section so that the order of wiring of the signal lines on which the high-frequency signal is superimposed is different between the odd number and the even number in the connection order from the upper part of the distribution board . A power line communication system for transmitting and receiving signals between a first transceiver and a plurality of second transceivers respectively connected to a plurality of divided power lines,
A distribution board that divides the secondary side of the transformer that converts the voltage of the main power line, which is a high-voltage distribution line, into commercial power and distributes it to a plurality of power line pairs, and the same phase that is divided by the distribution board A plurality of power line pairs, an injection unit provided on each of the first and second power lines constituting the plurality of power line pairs, for superimposing signals to be transmitted and extracting signals to be received, and the first transmission and reception A distributor for distributing a pair of signal lines formed in a loop extending from the machine,
  A plurality of signal lines distributed in the distributor share the plurality of power line pairs and superimpose the high-frequency signal;
  When the distributed signal line superimposes the high-frequency signal via the injection unit to two or more power line pairs,
  In the power line pair in which the connection order from the upper part of the distribution board among the plurality of power line pairs is odd-numbered, the signal line is passed through the injection part of the first power line first, and then the injection part of the second power line The power line pairs that are even numbers are routed through the injection part of the first power line before passing through the injection part of the first power line, and the plurality of power line pairs are connected via the injection part. A power line communication system, characterized in that loop wiring is performed to the injection section so that the order of wiring of the signal lines on which the high-frequency signal is superimposed is different between the odd number and the even number in the connection order from the upper part of the distribution board.

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