TWI740303B - Coupling device - Google Patents

Abstract

A first inductive coupling section 110a and a second inductive coupling section 110b realize magnetic coupling between a first power line 30a and second power line 30b that supply power to a load 130, and a first signal line 60a and second signal line 60b capable of exchanging signals with a communication device 200. A first power line connection section 120a and a second power line connection section 120b are disposed between the first inductive coupling section 110a and second inductive coupling section 110b and the load 130, and connect the first signal line 60a and second signal line 60b to the first power line 30a and second power line 30b.

Description

Coupling device

This manual is about the coupling device that couples the signal line to the power line.

In power line communication, the radio frequency signal is superimposed on the power line pulled into the home. In order to superimpose the radio frequency signal to the power line, a capacitive coupling method or an inductive coupling method is used. In the capacitive coupling method, when the impedance of the power line is low, the injection efficiency of the radio frequency signal is reduced. In the inductive coupling method, when the impedance of the power line is high, the injection efficiency of the radio frequency signal is reduced. In order to stabilize the injection efficiency of the radio frequency signal even when the impedance changes, in addition to the tubular power line injection part that injects the radio frequency signal flowing through the signal line into the power line, it also has a terminal that passes the radio frequency signal flowing through the signal line through the capacitor element. It is injected into the tubular capacitor injection part of the power line (for example, refer to Patent Document 1).

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Application Publication No. 2009-212836

In order to inject radio frequency signals into the power line through the bypassed terminal line of the capacitive element, if the terminal line only penetrates the iron core, the capacitive coupling is weak, and the passing loss as a transformer device is large. We seek to efficiently inject radio frequency signals into power lines.

In view of this situation, the purpose of this specification is to provide a technique for reducing the influence of the impedance of the power line and efficiently injecting signals into the power line.

In order to solve the above-mentioned problems, a coupling device of one aspect of this specification includes: an inductive coupling portion that magnetically couples the power line and the signal line, the power line is used to supply power to the load, and the signal line can transmit signals between the communication device; And the power line connection part, which connects the signal line extending from the communication device via the inductive coupling part to the power line.

According to this manual, the influence of the impedance of the power line can be reduced, and the signal can be injected into the power line efficiently.

10: High voltage transmission wiring

12: Branch transmission wiring

12a: The first branch transmission line

12b: The second branch transmission line

12c: The third branch transmission line

14: Transformer

14a: first transformer

14b: 2nd transformer

16: Primary coil

18: Secondary coil

20: Low-voltage transmission wiring

20a: The first low-voltage transmission line

20b: The second low-voltage transmission line

20c: The third low-voltage transmission line

20d: 4th low voltage transmission line

22: Neutral

22a: 1st neutral line

22b: 2nd neutral

24: Ground wire

26: Main circuit breaker

30: Power line

30a: 1st power line

30b: 2nd power line

50: Residential switchboard

50a: 1st residential switchboard

50b: 2nd residential switchboard

50c: 3rd residential switchboard

50d: 4th residential switchboard

60: signal line

60a: 1st signal line

60b: 2nd signal line

100: Coupling device

110: Inductive coupling part

110a: The first inductive coupling part

110b: The second inductive coupling part

110c: The third inductive coupling part

110d: 4th inductive coupling part

112: iron core

120: Power line connection part

120a: 1st power line connection part

120b: 2nd power line connection part

120c: 3rd power line connection part

120d: 4th power line connection part

130: load

130a: first load

130b: second load

200: Communication device

210: sending circuit

212: receiving circuit

220: primary coil

222: Primary coil

224a: No. 1 capacitor

224b: 2nd capacitor

226: Power Supply Department

Figure 1 shows the configuration of the power distribution system of Example 1.

Figure 2 (a) ~ (b) shows the structure of the device in Figure 1.

Figure 3 (a) ~ (b) shows the configuration of the power distribution system of the modified example.

Fig. 4 shows the structure of the device of the second embodiment.

Figure 5 shows the configuration of the device of Example 3.

[Preferable form of implementing the invention]

(Example 1)

Before describing the embodiments of this specification in detail, the basic knowledge that is the basis of the embodiments will be explained. The present embodiment relates to a power distribution system that supplies electric power to facilities such as residential complexes and homes through power lines that are pulled into the facilities. In the power distribution system, power line communication that transmits signals to the power line is formed. This signal has, for example, a frequency band from 1 MHz to 30 MHz, which is different from the commercial power frequency of 50 Hz or 60 Hz that the power has. Power line communication is susceptible to power line divergence, power line impedance, residential switchboards, household appliances, and other load noise. Therefore, it is important to ensure communication reliability in power line communication. In order to improve communication reliability, the influence of these must be reduced. As mentioned earlier, in order to superimpose signals on the power line in power line communication, a capacitive coupling method or an inductive coupling method is used. The signal injection efficiency of the power line is affected by the impedance of the power line. When the impedance is low, the signal injection efficiency of the capacitive coupling method becomes lower, and when the impedance is high, the signal injection efficiency of the inductive coupling method becomes lower.

Because the power line is connected to various electrical products, the impedance of the power line will change significantly. In the case of a large change in impedance, in the case of using capacitive coupling or inductive coupling, the signal injection efficiency will change and the stability of communication cannot be ensured. In order to cope with this, Patent Document 1 has: an iron core for power lines, which injects radio frequency signals flowing through the signal lines into the power lines; and a capacitive element, which connects the power lines by terminal lines extending from both poles, so that radio frequency signals are connected between the power lines. Bypass; and a capacitor iron core, which injects the radio frequency signal flowing in the signal line into the power line via the terminal line of the capacitor element. In particular, in order to inject radio frequency signals into the power line via the bypassed terminal line of the capacitor element, the terminal line penetrates the capacitor iron core. However, if only the terminal wire penetrates the capacitor iron core, the capacitive coupling is weak, and the passing loss as a transformer device is large. Therefore, it is sought to reduce the influence of the impedance of the power line and to efficiently inject signals into the power line. Moreover, if the iron core for capacitors is added to the iron core for power lines, the number of parts will increase. However, it is better to have fewer parts.

FIG. 1 shows the composition of a power distribution system 1000. The power distribution system 1000 includes: a high-voltage transmission line 10; a first branch transmission line 12a, a second branch transmission line 12b, and a third branch transmission line 12 that are collectively referred to as branch transmission lines 12; a transformer 14; Low-voltage transmission line 20a, second low-voltage transmission line 20b; neutral line 22; ground line 24; main circuit breaker 26; first power line 30a and second power line 30b collectively called power line 30; first house collectively called residential switchboard 50 The switchboard 50a, the second house switchboard 50b, the third house switchboard 50c, and the fourth house switchboard 50d. The number of residential switchboards 50 is not limited to "4". The transformer 14 includes a primary coil 16 and a secondary coil 18.

The high-voltage transmission line 10 is also called a main power line, and uses three transmission lines to supply three-phase AC power with a line-to-line voltage of 6600 [V]. The branch transmission line 12 is a transmission line branched from the high-voltage transmission line 10. 1st branch transmission and distribution The line 12a to the third branch transmission line 12c are different transmission lines connected to the high-voltage transmission line 10 at one end. The first branch transmission line 12a to the third branch transmission line 12c are connected to the primary coil 16 of the transformer 14 on the other end side. The transformer 14 is installed, for example, on the roof of a customer facility or in an electric machine room. Demand household facilities are facilities that consume commercially available electricity. For example, they are collective housing, residences, and office buildings. In addition, they can also be buildings such as commercial facilities, factories, and hospitals.

The transformer 14 includes a secondary coil 18 arranged opposite to the primary coil 16, and transforms (steps down) an AC voltage of 6600 [V] to an AC voltage of 200 [V] (or 100 [V]). The secondary coil 18 is connected to a first low-voltage transmission line 20 a, a second low-voltage transmission line 20 b, and a neutral line 22, and the neutral line 22 is grounded via a ground line 24. Therefore, the voltage between the first low-voltage transmission line 20a and the second low-voltage transmission line 20b is 200V, but the voltage between the first low-voltage transmission line 20a and the neutral line 22, the neutral line 22 and the second low-voltage transmission line 20b The voltage between them is 100V respectively. Electric power with such a voltage is also called commercial power, and has the aforementioned commercial power frequency.

The low-voltage transmission line 20 and the neutral line 22 are connected to the main circuit breaker 26 installed in the customer facility. The main circuit breaker 26 is, for example, a circuit breaker that is connected to the side closest to the transformer 14 in a consumer facility such as a residential complex. The main circuit breaker 26 supplies electric power to most residential switchboards 50 via the power line 30. This power is equivalent to the aforementioned commercial power. The residential switchboard 50 is a switchboard installed in each household. Each residential switchboard 50 has a function of power line communication, and performs power line communication with other residential switchboards 50 via the power line 30.

Fig. 2 (a) ~ (b) shows the structure of the residential switchboard 50. Particularly, Fig. 2(a) shows the configuration of power line communication among the residential switchboard 50 connected to the power line 30. The residential switchboard 50 includes: a first signal line 60a and a second signal line 60b collectively referred to as a signal line 60; a coupling device 100; a load 130; and a communication device 200. In addition, the coupling device 100 includes: a first inductive coupling portion 110a and a second inductive coupling portion 110b collectively referred to as an inductive coupling portion 110;

Electric power is supplied to the residential switchboard 50 via the first power line 30a and the second power line 30b as described above. The first power line 30a and the second power line 30b are connected to a load 130 via a coupling device 100 described later, and supply electric power to the load 130. Therefore, the load 130 can be said to be a device that is connected to the power line 30 and is supplied with power. Such a load 130 includes the branch of the power line 30, the impedance of the power line 30, and household electrical appliances. Also, in the case of a communication system that connects a communication device (communication master) as a master and a majority of communication devices (communication slaves) as slaves, the master and slaves become coupling points and are connected to all of the coupling points The components can be called "loads". Due to the variation of the load 130, the impedance of the power line 30 will change. Here, the main circuit breaker 26 of FIG. 1 is arranged on the left side of the power line 30. Therefore, another residential switchboard 50 is arranged on the left side of the power line 30.

The communication device 200 is a modem that performs power line communication, and its configuration is shown in FIG. 2(b). The communication device 200 includes: a transmitting circuit 210; a receiving circuit 212; a primary coil 220; a secondary coil 222; a first capacitor 224a and a second capacitor 224b collectively referred to as a capacitor 224; and a power supply unit 226. The transmission circuit 210 performs transmission processing in power line communication, and the reception circuit 212 performs reception processing in power line communication. The transmitting circuit 210 is connected to the primary coil 220 in parallel with the receiving circuit 212. Primary coil 220 series and The secondary coils 222 are arranged opposite to each other, and these constitute a transformer. The secondary coil 222 is connected to the first signal line 60a via the first capacitor 224a, and is connected to the second signal line 60b via the second capacitor 224b. In this way, the communication device 200 is electrically connected to the signal line 60.

The transmission circuit 210 outputs a signal for communication to the signal line 60 by changing the magnitude of the current output to the signal line 60 through the primary coil 220, the secondary coil 222, and the capacitor 224. For one example, the signal forms amplitude modulation, and the signal has a frequency band of 1 MHz to 30 MHz. The minimum frequency in this signal frequency band is higher than the frequency of the AC voltage in the power line 30. This type of signal frequency band is just an example and is not limited to this. On the other hand, the receiving circuit 212 receives the signal output to the signal line 60 via the primary coil 220, the secondary coil 222, and the capacitor 224. Furthermore, a power supply unit 226 is connected to the signal line 60. The power supply unit 226 supplies power from the power line connection unit 120 described later via the signal line 60. Return to Figure 2(a).

One end of the first signal line 60 a and the second signal line 60 b is connected to the communication device 200. The other end sides of the first signal line 60 a and the second signal line 60 b extend from the communication device 200 toward the inductive coupling portion 110 and the power line connection portion 120. The first signal line 60a and the second signal line 60b can transmit signals to and from the communication device 200, transmit signals from the communication device 200, or transmit signals to the communication device 200. It is also possible to twist the part between the inductive coupling portion 110 and the communication device 200 among the first signal line 60a and the second signal line 60b. Due to this twisting, the signal line 60 becomes shorter, and the signal to noise ratio (S/N) becomes higher.

The first inductive coupling portion 110a and the second inductive coupling portion 110b are, for example, an iron core 112 formed into an annular shape by a magnetic material such as ferrite. A circular through hole is provided in the center of the iron core 112. Electricity through the through hole Force line 30 and signal line 60. Specifically, the first power line 30a and the first signal line 60a are penetrated through the through hole of the first inductive coupling portion 110a, and the second power line 30b and the second signal line 60b are penetrated through the through hole of the second inductive coupling portion 110b. The first inductive coupling part 110a magnetically couples the first power line 30a and the first signal line 60a, and the second inductive coupling part 110b magnetically couples the second power line 30b and the second signal line 60b. That is, the power line 30, the signal line 60, and the iron core 112 form an inductive coupling type coupler. Here, the iron core 112 has a size such that an unsaturated magnetic flux density can be generated by the current flowing through the power line 30.

The first power line connection portion 120 a is arranged between the first inductive coupling portion 110 a and the load 130, and the second power line connection portion 120 b is arranged between the second inductive coupling portion 110 b and the load 130. The first power line 30a and the first signal line 60a are connected to one end of the first power line connection portion 120a. That is, the first power line connecting portion 120a electrically connects the first signal line 60a to the first power line 30a at one end side. Moreover, the load 130 is electrically connected to the other end side of the 1st power line connection part 120a. On the other hand, the second power line 30b and the second signal line 60b are connected to one end of the second power line connection portion 120b. That is, the second power line connecting portion 120b electrically connects the second signal line 60b to the second power line 30b at one end side. In addition, a load 130 is electrically connected to the other end side of the second power line connecting portion 120b. In this way, the power line connection part 120 connects the signal line 60 extending from the communication device 200 via the inductive coupling part 110 to the power line 30. The load 130 receives power supplied by the power line 30.

Here, a low impedance element (not shown) may also be disposed between the inductive coupling portion 110 and the load 130. For example, a low-impedance element, for example, a capacitor, is connected to the power line connection portion 120. In addition, the position where the first power line 30a and the second power line 30b of FIG. Connected as communication Other communication devices (not shown) of the communication partner of the device 200. That is, the other communication device is arranged on the side opposite to the power line connecting portion 120 with respect to the inductive coupling portion 110.

The following describes the signal transmission operation performed by the communication device 200 when the impedance of the power line 30 is small; and (2) the signal transmission operation performed by the communication device 200 when the impedance of the power line 30 is small. Signal receiving action. In addition, the description of (3) the operation of the communication device 200 in the case where the impedance of the power line 30 is large will be continued after these points.

(1) Signal transmission operation performed by the communication device 200 when the impedance of the power line 30 is small

After the communication device 200 outputs the signal to the signal line 60, when the signal passes through each inductive coupling portion 110, a magnetic flux is generated in each inductive coupling portion 110. The magnetic flux generated in each inductive coupling portion 110 superimposes the signal on the alternating current flowing through the power line 30. Therefore, the signal is superimposed on the AC power supplied to the pair of power lines 30 by the magnetic coupling through the generated magnetic flux.

(2) The signal receiving operation performed by the communication device 200 when the impedance of the power line 30 is small

The signal transmitted by the other communication device 200 (not shown) included in the other house switchboard 50 is also superimposed on the alternating current flowing through the power line 30 as in the case of (1). When the signal superimposed on the alternating current passes through each inductive coupling portion 110 of the residential switchboard 50, a magnetic flux is generated in each inductive coupling portion 110. The signal is output to the signal line 60 due to the magnetic flux, and the signal output to the signal line 60 is received by the communication device 200.

(3) The operation of the communication device 200 when the impedance of the power line 30 is large

If the impedance of the power line 30 is large, even if the communication device 200 outputs a signal to the signal line 60, each inductive coupling portion 110 does not generate magnetic flux. Therefore, in each inductive coupling portion 110, the signal is not superimposed on the alternating current. However, since the power line 30 and the signal line 60 are connected in each power line connection part 120, the communication device 200 can directly apply power to the power line 30 in the power line connection part 120. Therefore, the signal output by the communication device 200 to the signal line 60 is superimposed on the AC power supplied to the pair of power lines 30 in the power line connection section 120. When the communication device 200 receives a signal, the AC power supplied to the pair of power lines 30 in the power line connection portion 120 also receives the signal.

When the load 130 is small, the alternating current superimposed in the first power line connection portion 120a is input to the load 130 from the first power line connection portion 120a, and then is output from the second power line connection portion 120b to the second power line via the load 130 30b. On the other hand, the alternating current superimposed on the second power line connection portion 120b is input to the load 130 from the second power line connection portion 120b, and then is output from the first power line connection portion 120a to the first power line 30a via the load 130. That is, between the first inductive coupling portion 110a and the first power line connecting portion 120a in the first power line 30a, there are alternating currents flowing through many kinds of paths. The same applies to the second power line 30b.

In this situation, since the phases of the alternating currents of these persons are different, the alternating currents of these persons must not cancel each other out. Therefore, the distance between the inductive coupling portion 110 and the power line connection portion 120 is determined to be 1/2 or less of the shortest wavelength of the signal transmitted in the signal line 60. For example, the distance between the inductive coupling portion 110 and the power line connection portion 120 is determined to be 1/4 of the shortest wavelength of the signal transmitted in the signal line 60. If the maximum frequency of the signal is set to 28 MHz, the distance between the inductive coupling portion 110 and the power line connection portion 120 is set to 2.68 m.

As shown in FIG. 2(a), the inductive coupling portion 110, the power line connecting portion 120, and the load 130 are arranged in this order. That is, the power line connecting portion 120 is arranged between the inductive coupling portion 110 and the load 130. This is because if the inductive coupling part 110 is arranged between the power line connecting part 120 and the load 130, the inductance will increase due to the arrangement of the inductive coupling part 110, and the voltage applied to the load 130 will decrease.

Hereinafter, a modification of FIG. 2(a) will be described. Figure 3 (a) ~ (b) show the composition of the power distribution system 1000. Fig. 3(a) shows a configuration in a case where the first transformer 14a and the second transformer 14b are arranged in Fig. 1. The first transformer 14a is connected to the first low-voltage transmission line 20a, the second low-voltage transmission line 20b, and the first neutral line 22a. The second transformer 14b is connected to the third low-voltage transmission line 20c, the fourth low-voltage transmission line 20d, and the second middle.性线22b. In addition, the first low-voltage transmission line 20a, the second low-voltage transmission line 20b, and the first neutral line 22a are connected to the main circuit breaker 26 (not shown) in the same manner as in FIG. The wiring 20d and the second neutral line 22b are also connected to the main circuit breaker 26 (not shown).

Here, between the first transformer 14a and the first low-voltage transmission line 20a, a first inductive coupling portion 110a and a first power line connection portion 120a are arranged, and between the first transformer 14a and the first neutral line 22a, a first 2 Inductive coupling part 110b, second power line connection part 120b. In addition, between the second transformer 14b and the third low-voltage transmission line 20c, a third inductive coupling portion 110c and a third power line connection portion 120c are arranged, and between the second transformer 14b and the second neutral line 22b, a fourth The inductive coupling part 110d and the fourth power line connection part 120d. The first inductive coupling portion 110a to the fourth inductive coupling portion 110d are collectively referred to as the inductive coupling portion 110, the first power line connecting portion 120a to the fourth power line connecting portion 120d are collectively referred to as the power line connecting portion 120, and the inductive coupling portion 110 and the power line connecting portion 120 include In the coupling device 100. Furthermore, to bridge the inductive coupling portion 110 on the side of the first transformer 14a and the power The line connection part 120, the inductive coupling part 110 on the side of the second transformer 14b, and the power line connection part 120 are arranged with a first signal line 60a and a second signal line 60b.

FIG. 3(b) shows the configuration of the coupling device 100. As shown in FIG. This line is shown in conjunction with Figure 2(a). The first load 130a corresponds to the first transformer 14a of Fig. 3(a), and the second load 130b corresponds to the second transformer 14b of Fig. 3(a). The first signal line 60a is connected to the first low-voltage transmission line 20a in the first power line connection portion 120a. In addition, the first signal line 60a passes through the through hole of the first inductive coupling portion 110a and also passes through the through hole of the third inductive coupling portion 110c. In addition, the first signal line 60a is connected to the third low-voltage transmission line 20c in the third power line connection portion 120c. On the other hand, the second signal line 60b is connected to the first neutral line 22a in the second power line connection portion 120b. In addition, the second signal line 60b passes through the through hole of the second inductive coupling portion 110b and also passes through the through hole of the fourth inductive coupling portion 110d. Furthermore, the second signal line 60b is connected to the second neutral line 22b in the fourth power line connection portion 120d.

With this connection, it is possible to transmit signals between the combination of the first low-voltage transmission line 20a and the first neutral line 22a, and the combination of the third low-voltage transmission line 20c and the second neutral line 22b. This means that the transmission of signals across different transformers 14 can be carried out. Such a configuration can be said to be a configuration that does not include the communication device 200.

According to this embodiment, because the power line 30 and the signal line 60 are magnetically coupled, and the signal line 60 is connected to the power line 30, when the impedance of the load 130 is small, the signal can be superimposed on the power line by magnetic coupling. In addition, because the power line 30 and the signal line 60 are magnetically coupled, and the signal line 60 is connected to the power line 30, when the impedance of the load 130 is large, a signal can be output to the power line 30 through the signal line 60 to overlap the signal To the power line. In addition, since the signal is superimposed on the power line no matter the impedance of the load 130 is large or small, the signal can be superimposed on the power line regardless of the impedance of the load 130 String. In addition, since the signal line 60 is connected to the power line 30, the influence of the impedance of the power line 30 can be reduced, and the power line 30 can be efficiently injected.

In addition, since power is supplied to the communication device 200 via the signal line 60, the communication device 200 can be operated. In addition, because the distance between the inductive coupling portion 110 and the power line connection portion 120 is set to be less than 1/2 of the shortest wavelength of the signal transmitted in the signal line 60, it is possible to prevent signals passing through many channels from being offset due to phase differences. pin. In addition, because the power line connecting portion 120 is disposed between the inductive coupling portion 110 and the load 130, the current flowing in the load 130 also flows in the inductive coupling portion 110, which can increase the amount of coupling. In addition, since the amount of coupling increases, the loss can be reduced. In addition, because another communication device that is a communication target of the communication device 200 is arranged on the side opposite to the power line connection portion 120 with respect to the inductive coupling portion 110, the current flowing through the load 130 can also flow through the inductive coupling portion 110. In addition, since the current flowing through the load 130 also flows through the coupling part 110, the coupling amount is increased, and the loss can be reduced. In addition, since a low-impedance element is arranged between the inductive coupling portion 110 and the load 130, it is possible to reduce noise from household electrical appliances connected to the residential switchboard 50. In addition, since a low impedance element is arranged between the inductive coupling portion 110 and the load 130, the coupling efficiency of the inductive coupling portion 110 can be improved.

The summary of one aspect of this manual is as follows. One aspect of the coupling device 100 in this specification includes: an inductive coupling portion 110 that magnetically couples the power line 30 and the signal line 60, the power line 30 is used to supply power to the load 130, and the signal line 60 can transmit signals between the communication device 200 And the power line connecting portion 120, which connects the signal line 60 extending from the communication device 200 via the inductive coupling portion 110 to the power line 30. The signal line 60 from the communication device 200 ends at the power line connection part 120.

The power line connection part 120 may also supply power to the communication device 200 via the signal line 60.

The distance between the inductive coupling portion 110 and the power line connection portion 120 may also be less than 1/2 of the shortest wavelength of the signal transmitted in the signal line 60.

The power line 30 may include a first power line 30a and a second power line 30b. The signal line 60 may include a first signal line 60a and a second signal line 60b. The inductive coupling portion 110 may also include: a first inductive coupling portion 110a for magnetically coupling the first power line 30a and the first signal line 60a; and a second inductive coupling portion 110b for magnetically coupling the second power line 30b and the second signal line 60b Magnetic coupling. The power line connection part 120 may also include: a first power line connection part 120a for connecting the first signal line 60a extending from the communication device 200 via the first inductive coupling part 110a to the first power line 30a; and a second power line connection part 120b, The second signal line 60b extending from the communication device 200 via the second inductive coupling portion 110b is connected to the second power line 30b. The first signal line 60a from the communication device 200 ends at the first power line connection portion 120a. The second signal line 60b from the communication device 200 ends at the second power line connection portion 120b.

Another communication device that is a communication target of the communication device 200 may be arranged on the side opposite to the power line connection portion 120 with respect to the self-inductive coupling portion 110.

It may further include: a low-impedance element disposed between the inductive coupling portion 110 and the load 130.

(Example 2)

Next, Embodiment 2 will be explained. The second embodiment is the same as the first embodiment about the coupling device used in power line communication. In the first embodiment, the through hole of the iron core provided in the inductive coupling portion has a signal line through it. When the load is capacitive, the inductive coupling part and the load form a resonant circuit, and the impedance becomes lower at the resonant frequency. When the resonance frequency is included in the signal frequency band, signal attenuation will occur. The second embodiment aims at reducing the influence of resonance when the load is capacitive. The power distribution system 1000 of the second embodiment is of the same type as that of FIG. 1. Here, the difference from Example 1 will be described as the center.

FIG. 4 shows the structure of a residential switchboard 50. As shown in FIG. The residential switchboard 50 is shown in the same manner as in FIG. 2(a), but the load 130 is determined to be capacitive. In addition, the signal line 60 is wound around the iron core 112 several times along the through hole and the outer edge of the iron core 112 of the inductive coupling portion 110. Since the signal line 60 is wound around the iron core 112 multiple times, the inductance L of the inductive coupling portion 110 becomes larger. The resonance frequency in the case where the inductive coupling part 110 resonates with the load 130 is that the larger the inductance L, the lower. As long as the resonance frequency is lower than the lower limit of the signal frequency band, the influence of resonance becomes smaller. Therefore, the number of turns of the signal line 60 is determined so that the resonance frequency is lower than the lower limit of the signal frequency band.

According to this embodiment, in the iron core 112, since the signal line 60 is wound multiple times, the inductance of the inductive coupling portion 110 can be increased. In addition, since the inductance of the inductive coupling portion 110 becomes larger, the resonance frequency can be shifted to the lower frequency side compared to the communication frequency band. In addition, since the resonance frequency is shifted to a lower frequency side than the communication frequency band, the generation of signal attenuation can be suppressed.

The summary of one aspect of this manual is as follows. The inductive coupling part 110 may also include a magnetic iron core 112. In the iron core 112, the signal line 60 may be wound multiple times.

(Example 3)

Next, Embodiment 3 will be explained. The third embodiment relates to the coupling device used in power line communication as before. However, in Example 3, the wiring of the signal line is different compared to before. The power distribution system 1000 of the third embodiment is of the same type as that of FIG. 1. Here, we will focus on the difference from the previous one.

FIG. 5 shows the structure of a residential switchboard 50. As shown in FIG. The residential switchboard 50 is shown in the same manner as in FIG. 2(a), but the wiring of the signal line 60 is different as described above. The first power line 30a and the first signal line 60a are penetrated through the through hole of the first inductive coupling portion 110a, and the second power line 30b and the second signal line 60b are penetrated through the through hole of the second inductive coupling portion 110b. The first inductive coupling part 110a magnetically couples the first power line 30a and the first signal line 60a, and the second inductive coupling part 110b magnetically couples the second power line 30b and the second signal line 60b.

The first power line 30a and the second signal line 60b are connected to one end of the first power line connection portion 120a. That is, the first power line connecting portion 120a electrically connects the second signal line 60b to the first power line 30a at one end side. Moreover, the load 130 is electrically connected to the other end side of the 1st power line connection part 120a. On the other hand, the second power line 30b and the first signal line 60a are connected to one end of the second power line connection portion 120b. That is, the second power line connecting portion 120b electrically connects the first signal line 60a to the second power line 30b at one end side. In addition, a load 130 is electrically connected to the other end side of the second power line connecting portion 120b.

According to this embodiment, because the first power line connecting portion 120a connects the second signal line 60b to the first power line 30a, and the second power line connecting portion 120b connects the first signal line 60a to the second power line 30b, the inductance can be reduced. The resulting phase lead and the phase delay caused by the capacitance are adjusted. Also, because of the inductance The phase lead and the phase delay caused by the capacitance are adjusted, which can suppress the signal attenuation in the communication frequency band.

The summary of one aspect of this manual is as follows. The power line 30 may include a first power line 30a and a second power line 30b. The signal line 60 may include a first signal line 60a and a second signal line 60b. The inductive coupling portion 110 may also include: a first inductive coupling portion 110a for magnetically coupling the first power line 30a and the first signal line 60a; and a second inductive coupling portion 110b for magnetically coupling the second power line 30b and the second signal line 60b Magnetic coupling. The power line connection part 120 may also include: a first power line connection part 120a for connecting a second signal line 60b extending from the communication device 200 via the second inductive coupling part 110b to the first power line 30a; and a second power line connection part 120b, The first signal line 60a extending from the communication device 200 via the first inductive coupling portion 110a is connected to the second power line 30b. The first signal line 60a from the communication device 200 ends at the second power line connection portion 120b. The second signal line 60b from the communication device 200 ends at the first power line connection portion 120a.

Above, the present specification has been explained based on the embodiments. This embodiment is an example to show that a person with ordinary knowledge in the technical field to which the present invention belongs can understand that there can be various modifications of the various constituent elements or the combination of various processing procedures, and these modifications are also in the present invention. The scope of the specification.

In Embodiments 1 to 3, the load 130 is connected to the power line 30. However, it is not limited to this, for example, the power line 30 may be connected to one branch circuit breaker of a switchboard. At this time, there may be no load 130. According to this modification, the scope of application of the embodiment can be expanded.

[Industrial Utilization]

According to this manual, the influence of the impedance of the power line can be reduced, and the signal can be injected into the power line efficiently.

30: Power line

30a: 1st power line

30b: 2nd power line

50: Residential switchboard

60: signal line

60a: 1st signal line

60b: 2nd signal line

100: Coupling device

110: Inductive coupling part

110a: The first inductive coupling part

110b: The second inductive coupling part

112: iron core

120: Power line connection part

120a: 1st power line connection part

120b: 2nd power line connection part

130: load

200: Communication device

210: sending circuit

212: receiving circuit

220: primary coil

222: Primary coil

224a: No. 1 capacitor

224b: 2nd capacitor

226: Power Supply Department

Claims (10)

A coupling device, characterized by comprising: an inductive coupling part that magnetically couples a power line and a signal line, the power line supplies power to a load, and the signal line can transmit signals between the signal line and a communication device; The signal line extending from the communication device via the inductive coupling part is connected to the power line; and the signal line from the communication device ends at the power line connection part. Such as the coupling device of the first item of the scope of patent application, wherein the power line connection part supplies power to the communication device via the signal line. For example, the coupling device of item 1 or 2 of the scope of patent application, wherein the distance between the inductive coupling part and the power line connection part is less than 1/2 of the shortest wavelength of the signal transmitted in the signal line. For example, the coupling device of the first item of the scope of patent application, wherein the inductive coupling portion includes a magnetic iron core, and the signal line is wound on the iron core multiple times. Such as the coupling device of the second item of the scope of patent application, wherein the inductive coupling part includes a magnetic iron core, The signal wire is wound on the iron core multiple times. For example, the coupling device of the third item of the scope of patent application, wherein the inductive coupling portion includes a magnetic iron core, and the signal line is wound on the iron core multiple times. For example, the coupling device of the first item of the scope of patent application, wherein the power line includes a first power line and a second power line, the signal line includes a first signal line and a second signal line, and the inductive coupling portion includes: a first inductive coupling portion, Causing the first power line to be magnetically coupled with the first signal line; and a second inductive coupling section for magnetically coupling the second power line and the second signal line; and the power line connecting section includes: a first power line connecting section, Connect the first signal line extending from the communication device through the first inductive coupling portion to the first power line; and the second power line connecting portion to connect the communication device extending from the communication device via the second inductive coupling portion to the first power line The second signal line is connected to the second power line, the first signal line from the communication device ends at the first power line connection part, and the second signal line from the communication device ends at the second power line connection part . For example, the coupling device of the first item of the scope of patent application, wherein the power line includes a first power line and a second power line, the signal line includes a first signal line and a second signal line, and the inductive coupling portion includes: a first inductive coupling portion, Magnetically coupling the first power line and the first signal line; and a second inductive coupling section magnetically coupling the second power line and the second signal line; And the power line connection part includes: a first power line connection part to connect the second signal line extending from the communication device through the second inductive coupling part to the first power line; and a second power line connection part to connect the second signal line to the first power line The first signal line extending from the communication device via the first inductive coupling part is connected to the second power line, the first signal line from the communication device ends at the second power line connection part, and the communication device comes from the The second signal line ends at the first power line connection part. For example, the coupling device of the first item of the scope of patent application, wherein another communication device as a communication target of the communication device is arranged on the opposite side of the power line connecting portion compared to the inductive coupling portion. For example, the coupling device of item 1 of the scope of the patent application further includes: a low-impedance element disposed between the inductive coupling part and the load.

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