JP2009159302A - Single-phase three-wire alternating power line plc signal gate device and distribution board and power meter having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single-phase three-wire alternating power line PLC signal gate device which can prevent a PLC signal flowing through a single-phase three-wire alternating power line at a power receiving side from flowing out to a power supplying side in power line communication using an in-house PLC modem. <P>SOLUTION: The single-phase three-wire alternating power line PLC signal gate device 10 has a first inductive coil L1 inserted into a branching point of a power supplying side and a power receiving side in the single-phase three-wire alternating power line, wherein a neutral line coil L11 of the first inductive coil L1, one side phase winding L12, and other side phase winding L13 are respectively inserted in series into an intermediate portion of a neutral line 9 of the single-phase three-wire alternating power line, an intermediate portion of another phase power line 8 of the single-phase three-wire alternating power line, and an intermediate portion of the other phase power line 7 of the single-phase three-wire alternating power line and a winding direction of one phase winding L12 and a winding direction of the other side phase winding L13 are made opposite to the winding direction of the neutral winding line L11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a PLC signal gate device for a single-phase three-wire AC power line used for a single-phase three-wire AC power line in which PLC communication is performed using a PLC modem, and a PLC signal for the single-phase three-wire AC power line. The present invention relates to a distribution board provided with a gate device and a wattmeter.

  As a means for transmitting information indoors, wired LAN, wireless LAN, infrared communication, and the like are used. Recently, power line communication using a power line of a commercial power source as a communication medium has attracted attention. .

  This power line communication (PLC) uses an available high frequency band above a commercial frequency of AC 50/60 Hz used as a power source, thereby conveying a weak signal for information transmission in parallel with power. It is.

  As described above, this power line communication uses a power line as a communication medium, so that it is not necessary to lay a LAN cable or the like necessary for laying a wired LAN, and since it is wired communication, It also has advantages such as easy countermeasures against problematic security issues.

  By the way, in a Japanese house, the power distribution system is generally a single-phase three-wire system. Therefore, in this single-phase three-wire distribution system, the PLC modem is used by being connected between the neutral line (C) of the single-phase three-wire AC power line and one phase power line (for example, R phase). In this case, if the counterpart PLC modem is connected between the neutral line (C) of the single-phase three-wire AC power line and the power line (for example, T phase) of the other phase, the PLC signal between different phases Cannot be communicated satisfactorily, so good communication cannot be performed.

  Therefore, various mechanisms for transmitting PLC signals between different phases in this single-phase three-wire AC power line have been proposed (for example, see Patent Document 1). FIG. 3 of Patent Document 1 describes a power line communication device using a single-phase three-wire AC power line.

  The power line communication described above is communication between a plurality of PLC modems provided on the power receiving side of the single-phase three-wire AC power line in a single-phase three-wire AC power line at home or the like. This PLC modem is referred to as a home PLC modem in this specification. In this home PLC modem, the power source is AC 100V.

  In the single-phase three-wire distribution system in Japan, the voltage between the neutral line (C) of the single-phase three-wire AC power line and the power line of one phase (for example, R phase), and the neutral line (C ) And the power line (for example, T phase) of the other phase is AC100V. In addition, in a home, a two-wire system using a neutral line (C) and one phase power line (for example, R phase) or a neutral line (C) and another phase power line (for example, T phase). Wiring is done. Therefore, the above-described home PLC modem is generally used as power line communication used at home.

  However, recently, power line communication between a PLC modem provided on a power supply side and a PLC modem provided on a power reception side in a single-phase three-wire AC power line has also been performed.

  In the case of power line communication between the PLC modem provided on the power supply side and the PLC modem provided on the power receiving side in this single-phase three-wire AC power line, generally one of the single-phase three-wire AC power lines A PLC modem is connected between a phase power line (for example, R phase) and the other phase power line (for example, T phase). This PLC modem is referred to as an out-of-home PLC modem in this specification.

In the single-phase three-wire distribution system in Japan, the voltage between the power line of one phase (for example, R phase) and the power line of the other phase (for example, T phase) is AC200V. In the external PLC modem, the power source is AC200V.
JP 2003-37533 A

  By the way, in power line communication, the vacant high frequency band above the commercial frequency in the power line is used as wired communication. However, in power line communication using this high frequency band, if a signal in this high frequency band is radiated from the power line as a radio wave, it will interfere with other electronic devices as noise radio waves. It is necessary to suppress the radiation from the power line as a radio wave as much as possible.

  Therefore, in the power line communication using the home PLC modem, in order to prevent the PLC signal flowing through the single-phase three-wire AC power line in the home from being emitted as noise radio waves from the single-phase three-wire AC power line outside the home, It is desirable to prevent the PLC signal flowing through the single-phase three-wire AC power line from going out of the home.

  On the other hand, in power line communication such as business power line communication using an outside PLC modem, a PLC signal flowing through a single-phase three-wire AC power line outside the home flows into the single-phase three-wire AC power line inside the home. There is a need.

  Further, in a home PLC modem generally used in a home, in the conventional power line communication apparatus connected to the single-phase three-wire AC power line of FIG. An induction coil having three sets of windings in total, one set and two sets of secondary windings, is required. This increases the cost of the induction coil.

  Moreover, the power line communication device of the above-described conventional example includes an induction coil having three sets of windings inside the power line communication device so that it can be connected to a single-phase three-wire AC power line. This power line communication device is understood to have three terminals, a C terminal, an R phase terminal, and a T phase terminal for connection to a single-phase three-wire AC power line.

  However, a commercially available home PLC modem is configured to connect to a single-phase two-wire AC power line. Therefore, it is desired that a commercially available home PLC modem configured to connect to such a single-phase two-wire AC power line can be easily connected to the single-phase three-wire AC power line. ing.

  Therefore, the present invention has been made to cope with the above situation. In power line communication using a home PLC modem, a PLC signal flowing through a single-phase three-wire AC power line in a home is In the power line communication using a PLC modem outside the home, the PLC signal flowing through the single-phase three-wire AC power line outside the home is not transmitted from the single-phase three-wire AC power line outside the home. In addition, it is easy to connect a commercially available home PLC modem to a single-phase three-wire AC power line, and to suppress an increase in cost. An object of the present invention is to provide a PLC signal gate device for a single-phase three-wire AC power line.

  A PLC signal gate device for a single-phase three-wire AC power line according to the present invention includes a single-phase three including a first induction coil inserted at a branch point between a power supply side and a power reception side in a single-phase three-wire AC power line. It is a PLC signal gate device for a linear AC power line.

  The single-phase three-wire AC power line described above is connected to the home PLC modem between the neutral line of the single-phase three-wire AC power line and the one-phase power line on the power receiving side of the single-phase three-wire AC power line. While the PLC signal is injected, the PLC signal is injected between the neutral line of the single-phase three-wire AC power line and the power line of the other phase while the PLC signal is in the same phase. Therefore, the power line communication is performed between the home PLC modems connected between the neutral line of the power receiving side of the single-phase three-wire AC power line and one phase or the other phase.

  Further, in the first induction coil, a neutral wire winding is provided in the middle of the neutral wire of the single-phase three-wire AC power line among the three windings provided in the first induction coil. One phase winding is in the middle of one phase power line of the phase three-wire AC power line, and the other phase winding is in the middle of the other phase power line in the single-phase three-wire AC power line. Inserted in series.

  In addition, the single-phase three-wire AC power line PLC signal gate device described above is configured so that the winding direction of one phase winding and the winding direction of the other phase winding in the first induction coil are neutral windings. It is characterized by being configured to be opposite to the winding direction of the wire.

  In the above PLC signal gate device for single-phase three-wire AC power line, the winding direction of one phase winding and the winding direction of the other phase winding in the first induction coil are neutral windings. It is configured to be opposite to the winding direction.

  Then, as described above, in the power line communication using the home PLC modem on the power receiving side of the single-phase three-wire AC power line, between the neutral line of the single-phase three-wire AC power line and the power line of one phase The PLC signal of the in-home PLC modem is injected and the PLC signal is also injected between the neutral line of the single-phase three-wire AC power line and the power line of the other phase in the same phase state.

  For this reason, the PLC signal of the home PLC modem has a neutral line, one phase, and the other phase in the first induction coil, and the magnetic flux is strengthened in the first induction coil. Propagation is prevented.

  Therefore, the PLC signal of the home PLC modem on the power receiving side of the single-phase three-wire AC power line can be prevented from propagating from the first induction coil to the power supply side of the single-phase three-wire AC power line. Therefore, it is possible to suppress the PLC signal flowing through the single-phase three-wire AC power line in the home from being radiated as noise radio waves from the single-phase three-wire AC power line outside the home.

  In the PLC signal gate device for the single-phase three-wire AC power line, the number of windings of the neutral wire of the first induction coil, one phase winding, and the other phase winding is the same. Is preferred. By doing in this way, the function of the 1st induction coil can be exhibited with sufficient accuracy.

  Also, in the above-described single-phase three-wire AC power line PLC signal gate device, the single-phase three-wire AC power line includes one phase power line on the power supply side of the single-phase three-wire AC power line and the other phase. An external PLC modem connected between the power line and an external PLC modem connected between the power line of one phase and the power line of the other phase on the power receiving side of the single-phase three-wire AC power line; You may make it be the alternating current power line in which power line communication is performed between each other.

  As described above, in the above PLC signal gate device for single-phase three-wire AC power line, the winding direction of one phase winding of the single-phase three-wire AC power line in the first induction coil and the other phase winding. The first induction coil is configured so that the winding direction of the wire is opposite to the winding direction of the neutral wire winding. That is, the winding direction of one phase winding of the single-phase three-wire AC power line in the first induction coil is the same as the winding direction of the other phase winding.

  Then, the PLC signal of the PLC PLC outside the house is in the first induction coil, because one phase and the other phase of the single-phase three-wire AC power line are in opposite phases, and the magnetic flux cancels out in the first induction coil. The signal is propagated.

  Therefore, the PLC signal of the outside PLC modem on the power supply side of the single-phase three-wire AC power line can be propagated from the first induction coil to the power receiving side of the single-phase three-wire AC power line. Therefore, in power line communication using an out-of-home PLC modem, a PLC signal flowing through a single-phase three-wire AC power line outside the home can flow into the single-phase three-wire AC power line inside the home.

  In the single-phase three-wire AC power line PLC signal gate device described above, the following is preferable. That is, the primary circuit consisting of the primary winding of the second induction coil is connected in series with the home PLC modem between the neutral line of the single-phase three-wire AC power line and the power line of one phase. To be. Also, a second induction coil in which an induction current having the same phase as the current flowing in the primary winding of the second induction coil flows between the neutral line of the single-phase three-wire AC power line and the power line of the other phase. The secondary side circuit in which at least the secondary side windings are connected in series is connected. Then, the PLC signal phase injection is performed using the primary side circuit and the secondary side circuit.

  The PLC signal gate device for a single-phase three-wire AC power line may include the primary circuit and the secondary circuit. By doing in this way, in the PLC signal gate device for the single-phase three-wire AC power line, the second induction coil is interposed between the neutral line of the single-phase three-wire AC power line and the power line of one phase. A primary circuit composed of primary windings is connected in series with the home PLC modem. Therefore, the home PLC modem can be connected to the above-described single-phase three-wire type AC power line PLC signal gate device by connection with two terminals.

  According to the single-phase three-wire AC power line PLC signal gate device described above, the home PLC modem can be connected to the single-phase three-wire AC power line PLC signal gate device by connection using two terminals. Therefore, a commercially available PLC modem can be connected to the PLC signal gate device for a single-phase three-wire AC power line as a home PLC modem.

  Further, since the PLC signal interphase injection described above is performed using the primary side circuit and the secondary side circuit, the PLC signal of the home PLC modem connected to one phase of the single-phase three-wire AC power line. Can be injected into the other phase of the single-phase three-wire AC power line in the same phase. Therefore, a PLC signal can be transmitted between different phases in a single-phase three-wire AC power line. Therefore, it is possible to perform power line communication by connecting a commercially available home PLC modem between different phases of a single-phase three-wire AC power line.

  The second induction coil used in the single-phase three-wire AC power line PLC signal gate device is an induction coil having two sets of windings, a primary winding and a secondary winding. Therefore, the cost increase of the induction coil can be suppressed as compared with the case where the induction coil having three sets of windings in the power line communication device of the conventional example is used.

  In the above PLC signal gate device for single-phase three-wire AC power lines, it is appropriate that the number of turns of the primary side winding of the second induction coil is the same as the number of turns of the secondary side winding. . By doing in this way, the input / output of the PLC modem connected to the PLC signal gate device for the single-phase three-wire AC power line described above can be used for both one phase and the other phase of the single-phase three-wire AC power line. Both can be combined at the same level.

  In addition, it is appropriate to include a resistor and a capacitor connected in series in the secondary circuit used in the PLC signal gate device for the single-phase three-wire AC power line. Of the resistors and capacitors connected in series, the capacitor has a function of preventing an AC current having a commercial frequency from flowing through the secondary winding of the second induction coil. It has a function of suppressing the current flowing through the secondary winding to decrease.

  Therefore, by doing as described above, the allowable current in the second induction coil can be reduced, and the cost increase of the second induction coil used in the PLC signal gate device for the single-phase three-wire AC power line is suppressed. be able to.

  Each of the above PLC signal gate devices for single-phase three-wire AC power lines is provided at the branch point between the power supply side and the power reception side when the home is distributed using the single-phase three-wire distribution system. Can be built into the distribution board. That is, a distribution board provided with any one of the above-described single-phase three-wire AC power line PLC signal gate devices can be configured.

  According to this distribution board, the function of the distribution board and the function of the PLC signal gate device for the single-phase three-wire AC power line can be realized in one place, and labor saving of these installation spaces is achieved. be able to.

  In addition, each of the above PLC signal gate devices for single-phase three-wire AC power lines is built in a wattmeter that is used when power is distributed to a power receiving side such as a home by a single-phase three-wire distribution system. be able to. That is, a wattmeter including any of the above-described single-phase three-wire AC power line PLC signal gate devices can be configured.

  According to this wattmeter, the function of the wattmeter and the function of the PLC signal gate device for the single-phase three-wire AC power line can be realized in one place, and labor saving of these installation spaces can be achieved. it can.

  According to the present invention, the first induction coil of the PLC signal gate device for single-phase three-wire AC power line includes the winding direction of one phase winding in the first induction coil and the other phase winding. The winding direction is configured to be opposite to the winding direction of the neutral wire winding.

  Then, as described above, in the power line communication using the home PLC modem on the power receiving side of the single-phase three-wire AC power line, between the neutral line of the single-phase three-wire AC power line and the power line of one phase The PLC signal of the in-home PLC modem is injected and the PLC signal is also injected between the neutral line of the single-phase three-wire AC power line and the power line of the other phase in the same phase state.

  For this reason, the PLC signal of the home PLC modem has a neutral line, one phase, and the other phase in the first induction coil, and the magnetic flux is strengthened in the first induction coil. Propagation is prevented.

  Therefore, the PLC signal of the home PLC modem on the power receiving side of the single-phase three-wire AC power line can be prevented from propagating from the first induction coil to the power supply side of the single-phase three-wire AC power line. Therefore, it is possible to suppress the PLC signal flowing through the single-phase three-wire AC power line in the home from being radiated as noise radio waves from the single-phase three-wire AC power line outside the home.

  Further, the winding direction of one phase winding of the single-phase three-wire AC power line in the first induction coil is the same as the winding direction of the other phase winding. Then, the PLC signal of the PLC PLC outside the house is in the first induction coil, because one phase and the other phase of the single-phase three-wire AC power line are in opposite phases, and the magnetic flux cancels out in the first induction coil. With one induction coil, the PLC signal of the outside PLC modem is propagated.

  Therefore, the PLC signal of the outside PLC modem on the power supply side of the single-phase three-wire AC power line can be propagated from the first induction coil to the power receiving side of the single-phase three-wire AC power line. Therefore, in power line communication using an out-of-home PLC modem, a PLC signal flowing through a single-phase three-wire AC power line outside the home can flow into the single-phase three-wire AC power line inside the home.

  Further, in the PLC signal gate device for single-phase three-wire AC power line, the primary-side winding of the second induction coil is provided between the neutral line of the single-phase three-wire AC power line and the power line of one phase. The primary circuit is connected in series with the home PLC modem. Also, a second induction coil in which an induction current having the same phase as the current flowing in the primary winding of the second induction coil flows between the neutral line of the single-phase three-wire AC power line and the power line of the other phase. Are connected to a secondary circuit in which at least the secondary windings are connected in series. Then, the above PLC signal interphase injection is performed using the primary side circuit and the secondary side circuit. Therefore, a PLC signal can be transmitted between different phases in a single-phase three-wire AC power line. Therefore, it is possible to perform power line communication by connecting a commercially available home PLC modem between different phases of a single-phase three-wire AC power line.

  Next, a PLC signal gate device for a single-phase three-wire AC power line in an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a circuit configuration of a PLC signal gate device 10 for a single-phase three-wire AC power line in the present embodiment. The PLC signal gate device 10 for single-phase three-wire AC power lines in the present embodiment is a device that is inserted at a branch point between the power supply side and the power reception side in the single-phase three-wire AC power line. Therefore, in FIG. 1, the connection terminals J1 to J3 are connected to the power supply side, and the connection terminals J4 to J6 are connected to the power reception side.

  The PLC signal gate device for a single-phase three-wire AC power line in the present embodiment roughly has two functions.

  First, in power line communication using a home PLC modem, the PLC signal flowing through the single-phase three-wire AC power line in the home is not radiated as noise radio waves from the single-phase three-wire AC power line outside the home. In the power line communication using the PLC modem outside the home, the PLC signal flowing through the single-phase three-wire AC power line outside the home flows into the single-phase three-wire AC power line inside the home. This is referred to as a first function in the present embodiment.

  This first function is realized by the PLC signal gate circuit 1a of the PLC signal gate device for a single-phase three-wire AC power line in the present embodiment. The PLC signal gate circuit 1a includes a first induction coil.

  The other one is a single-phase three-wire AC power line that enables a PLC signal to be transmitted between different phases, and a commercially available home PLC modem is replaced with a single-phase three-wire AC power line. This is a function that allows easy connection. This is referred to as a second function in the present embodiment.

  This second function is realized by the PLC signal injection circuit 1b of the PLC signal gate device for a single-phase three-wire AC power line in the present embodiment. The PLC signal injection circuit 1b includes a second induction coil.

  Therefore, first, the second function of the PLC signal gate device for a single-phase three-wire AC power line in the embodiment of the present invention will be described. This second function uses the above-described second induction coil composed of a primary side winding and a secondary side winding to convert a modem signal of a home PLC modem to one of the single-phase three-wire AC power lines. It is injected into the phase and the other phase. Further, the frequency band used in this home PLC modem is 2 MHz to 30 MHz.

  Therefore, when configuring the PLC signal gate device for a single-phase three-wire AC power line in the present embodiment, in order to confirm the function based on the principle, the frequency band corresponds to the second induction coil. Using the experimental induction coil, three types of experiments were first performed: a first experiment, a second experiment, and a third experiment described below.

  FIG. 2 shows the configuration of the experimental induction coil L3 used in the three types of experiments described above. As shown in FIG. 2, the experimental induction coil L3 includes a primary winding L31 and a secondary winding L32 wound around a core formed of a magnetic material such as a donut-shaped ferrite. ing.

  The ratio of the number of turns of the primary side winding L31 and the secondary side winding L32 is 1: 1, that is, the number of turns of the primary side winding L31 and the number of turns of the secondary side winding L32 are the same. The primary winding L31 includes a primary side terminal T1 and a primary side terminal T2, and the secondary side winding L32 includes a secondary side terminal T3 and a secondary side terminal T4.

  In this experimental induction coil L3, when the primary side current flows in the primary side winding L31 in the direction of the primary side current direction 15 in FIG. An induced current flows in the direction of the secondary current direction 16 in a direction to cancel the magnetic flux generated by the primary side current. In the experimental induction coil L3, the primary side winding L31 and the secondary side winding L32 are wound so that the induction current has the same phase as the primary side current.

  Next, the first experiment will be described. The first experiment used the experimental induction coil L3 shown in FIG. 2, a 4-wire cable 4 composed of a three-core electric wire W1, an electric wire W2, and an electric wire W3, and two network analyzers. It is an experiment. As a function of this network analyzer, in addition to measuring the level of electric signals and observing waveforms, signals can be generated.

  Therefore, one of the two network analyzers is used as the transmission-side network analyzer 11 using the signal generation function of the network analyzer, and the other is used for the electric signal level measurement and waveform observation functions of the network analyzer. Used as the receiving network analyzer 12 used.

  That is, the transmission side network analyzer 11 outputs a sine wave of 2 MHz to 30 MHz, which is a frequency band used in the home PLC modem, and inputs the sine wave to the transmission end of the cable. From the above, the attenuation of the output at the receiving end of the cable and the observation of the waveform of the sine wave signal input to the transmitting end of the cable are performed. The two network analyzers are used in the same way in the second and third experiments described below.

  The first experiment is an experiment using the circuits shown in FIGS. In this first experiment, among the three-core electric wires W1, W2, and W3 of the cable, the electric wire W1 is a neutral wire of a single-phase three-wire AC power line, and the electric wire W2 is a single-phase three-wire AC power line. In this experiment, the power line of one phase of the power line W3 is regarded as the power line of the other phase of the single-phase three-wire AC power line.

  In the experiment using the circuit of FIG. 3 in the first experiment, the transmission-side network analyzer 11 is placed on the transmission end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase). The measurement is performed by connecting the resistor R2 (50Ω) and the receiving-side network analyzer 12 to the receiving end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase). Nothing is connected to both ends of the electric wire W3 (corresponding to the power line of the other phase). In the circuit of FIG. 3, the experimental induction coil L3 is not used.

  Further, in the experiment using the circuit of FIG. 4 in the first experiment, the transmission-side network analyzer 11 is connected to the transmission end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase). And a resistor R2 is connected to the transmission end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W3 (corresponding to the power wire of the other phase). Also, a resistor R2 is connected to the receiving end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase), and the electric wire W1 (corresponding to the neutral wire) and the electric wire W3 (the other wire) The reception side network analyzer 12 is connected to the reception end side (corresponding to the phase power line) and measurement is performed. Also in the circuit of FIG. 4, the experimental induction coil L3 is not used.

  In the experiment using the circuit of FIG. 5 in the first experiment, the experimental induction coil L3 is interposed between the electric wire W2 (corresponding to one phase power line) and the electric wire W3 (corresponding to the other phase power line). Is inserted. That is, by cutting the electric wire W2 (corresponding to one phase power line) and connecting it to the primary side terminal T1 and the primary side terminal T2 of the primary side winding L31, the electric wire W2 (to one phase power line) The primary winding L31 is inserted in the middle). In addition, the electric wire W3 (corresponding to the power line of the other phase) is cut and connected to the secondary side terminal T3 and the secondary side terminal T4 of the secondary side winding L32, so that the electric wire W3 (to the power line of the other phase) The secondary winding L32 is inserted in the middle.

  Further, the transmission side network analyzer 11 is connected to the transmission end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase), and the electric wire W1 (corresponding to the neutral wire) and the electric wire W3. A resistor R2 is connected to the transmission end side (corresponding to the power line of the other phase). Also, a resistor R2 is connected to the receiving end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase), and the electric wire W1 (corresponding to the neutral wire) and the electric wire W3 (the other wire) The reception side network analyzer 12 is connected to the reception end side (corresponding to the phase power line) and measurement is performed.

  FIG. 6 is a graph showing the results of the first experiment, in which the horizontal axis represents frequency (MHz) and the vertical axis represents attenuation (dB). In the graph of FIG. 6, D1 is the result of the experiment using the circuit of FIG. 3, D2 is the result of the experiment using the circuit of FIG. 4, and D3 is the result of using the circuit of FIG. It is the result of an experiment.

  From the graph of FIG. 6, the electric wire W1 (corresponding to the neutral wire) and the electric wire W1 (corresponding to the neutral wire) with respect to the sine wave signal input to the transmitting end of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase) The amount of attenuation at the receiving end of the electric wire W3 (corresponding to the power line of the other phase) is about −30 dB to about −20 dB in the experiment using the circuit of FIG. 4 without using the experimental induction coil L3. In the experiment using the circuit shown in FIG. 5 using the experimental induction coil L3, it is about −10 dB.

  As can be seen from this result, by using the experimental induction coil L3, the transmission-side network analyzer 11 connected to the transmission ends of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase). Can be effectively induced between the electric wire W1 (corresponding to the neutral wire) and the electric wire W3 (corresponding to the power line of the other phase).

  Next, the second experiment will be described. The second experiment is an experiment using the circuit of FIG. 7 and the circuit of FIG. In this second experiment, a length constituted by a three-core electric wire W1 (corresponding to a neutral wire), an electric wire W2 (corresponding to a power wire of one phase), and an electric wire W3 (corresponding to a power wire of the other phase). The experimental induction coil L3 is inserted between the electric wire W2 (corresponding to the power line of one phase) of the 4 m cable 4 and the electric wire W3 (corresponding to the power line of the other phase) in the same manner as the circuit shown in FIG. To do. And the transmission side network analyzer 11 is connected to the transmission end side of the electric wire W1 (equivalent to a neutral wire) and the electric wire W2 (equivalent to the power line of one phase), and the electric wire W1 (equivalent to a neutral wire) and the electric wire W3. The resistor R2 is connected to the transmission end side (corresponding to the power line of the other phase).

  Further, a length constituted by a two-core electric wire W1 (corresponding to a neutral wire) and an electric wire W2 (corresponding to a power wire of one phase) on the receiving end side of the cable 4 in which the experimental induction coil L3 is inserted. Transmission of a cable 6 having a length of 10 m composed of a transmission end side of the cable 5 having a length of 10 m, a two-core electric wire W1 (corresponding to a neutral wire), and an electric wire W3 (corresponding to the power line of the other phase). As shown in FIG. 7 and FIG. 8, the end side is connected by connecting electric wires having the same name. And in order to suppress the influence between the cable 5 and the cable 6, the cable 5 and the cable 6 are extended in the mutually opposite direction.

  Further, a resistor R2 is connected between the receiving end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase) on the receiving end side of the cable 5, and the receiving of the cable 6 is performed. A resistor R2 is connected between the receiving end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W3 (corresponding to the power line of the other phase) which is the end side.

  In this state, first, as shown in FIG. 7, the receiving side is between the receiving end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase) which is the receiving end side of the cable 5. A network analyzer 12 is connected to perform measurement. Next, as shown in FIG. 8, the receiving side network between the receiving end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase) on the receiving end side of the cable 6 The analyzer 12 is connected to perform measurement.

  FIG. 9 is a graph showing the results of the second experiment, in which the horizontal axis represents frequency (MHz) and the vertical axis represents attenuation (dB). In the graph of FIG. 9, D4 is the result of the experiment using the circuit of FIG. 7, and D5 is the result of the experiment using the circuit of FIG.

  From the graph of FIG. 9, the electric wire W1 (corresponding to the neutral wire) with respect to the sine wave signal input to the transmission end side of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase). Equivalent) and the attenuation on the receiving end side of the electric wire W2 (corresponding to the power line of one phase) and the attenuation on the receiving end side of the electric wire W1 (corresponding to the neutral line) and the electric wire W3 (corresponding to the power line of the other phase). The quantity curves are approximately coincident.

  As can be seen from this result, by using the experimental induction coil L3, the transmission-side network analyzer 11 connected to the transmission ends of the electric wire W1 (corresponding to the neutral wire) and the electric wire W2 (corresponding to the power line of one phase). Of the electric wire W1 (corresponding to the neutral wire) and the electric wire W3 (corresponding to the power line of the other phase) and the electric wire W1 (corresponding to the neutral wire) and the electric wire W3. (Corresponding to the power line of the other phase).

  Next, the third experiment will be described. The third experiment is an experiment using the circuit of FIG. 10 and the circuit of FIG. The circuit of FIG. 10 in the third experiment is the same as the circuit of FIG. 8 in the second experiment, and the circuit of FIG. 11 is an electric wire W1 (corresponding to a neutral wire) of the circuit of FIG. A capacitor C2 (0.47 μF) is connected in series with the connected resistor R2 on the transmission end side of W3 (corresponding to the power line of the other phase). That is, the third experiment examines the influence of the presence or absence of the capacitor C2.

  FIG. 12 is a graph showing the results of the third experiment, in which the horizontal axis represents frequency (MHz) and the vertical axis represents attenuation (dB). In the graph of FIG. 129, D6 is the result of the experiment using the circuit of FIG. 7, and D7 is the result of the experiment using the circuit of FIG.

  From the graph of FIG. 9, the electric wire W1 (corresponding to the neutral wire) and the electric wire W1 (corresponding to the neutral wire) with respect to the sine wave signal input to the transmitting end side of the electric wire W1 (corresponding to the power line of one phase) The curve of the attenuation amount on the receiving end side of the electric wire W3 (corresponding to the power line of the other phase) is almost the same between the case where the capacitor C2 is not connected and the case where the capacitor C2 is connected. That is, it can be seen that there is almost no influence due to the presence or absence of the capacitor C2.

  The PLC signal injection circuit 1b of the single-phase three-wire AC power line PLC signal gate device 10 according to the present embodiment shown in FIG. 1 is configured based on the results of the above experiment. In FIG. 1, a PLC signal injection circuit 1b of a PLC signal gate device 10 for a single-phase three-wire AC power line in the present embodiment is a second induction coil L2 manufactured in the same configuration as the experimental induction coil L3 described above. Is configured as follows.

  That is, the second induction coil L2 has a core formed of a magnetic material such as ferrite similar to the experimental induction coil L3 described above, and the primary winding L31 and the secondary winding of the experimental induction coil L3 described above. It is manufactured with a primary side winding L21 and a secondary side winding L22 wound in the same manner as the line L32.

  One end of the primary winding L21 is connected to one phase power line (for example, T phase) 8 of the single-phase three-wire AC power line, and the other end is connected to the home PLC modem via the connection terminal J8. 3a is connected to one of the input / output terminals. One end of the secondary winding L22 is connected to the other phase power line (for example, R phase) 7 of the single-phase three-wire AC power line, and the other end is connected in series to the resistor R1 and the capacitor C1. Are connected in series and connected to the neutral wire (N) 9 of the single-phase three-wire AC power line. The other of the input / output terminals of the home PLC modem 3a is also connected to the neutral line (N) 9 via the connection terminal J7.

  In the circuit configured as described above, the PLC signal injection circuit 1b of the PLC signal gate device 10 for the single-phase three-wire AC power line in the present embodiment does not include the home PLC modem 3a. That is, the home PLC modem 3a is connected to the single-phase three-wire AC power line by being connected to the connection terminals J7 and J8 included in the PLC signal injection circuit 1b.

  Further, as shown in FIG. 1, a home PLC modem 3b, a home PLC modem 3c, and the like are connected to the single-phase three-wire AC power line as home PLC modems of the home PLC modem 3a. That is, for example, the home PLC modem 3b is connected between a neutral line (N) 9 of a single-phase three-wire AC power line and a power line (for example, T phase) 8 of one phase, and the home PLC modem 3c Are connected between a neutral line (N) 9 of a single-phase three-wire AC power line and a power line (for example, R phase) 7 of the other phase.

  In the PLC signal injection circuit 1b of the PLC signal gate device 10 for the single-phase three-wire AC power line in FIG. 1, the neutral line (N) 9 of the single-phase three-wire AC power line and the power line of one phase (for example, T phase) ) 8 is connected to the home PLC modem 3a via the primary winding L21 of the second induction coil L2, and the neutral line (N) 9 of the single-phase three-wire AC power line and the other A secondary winding L22 of the second induction coil L2 is connected between the phase power line (for example, R phase) 7.

  When the output current of the home PLC modem 3a flows as the primary current in the primary winding L21 of the second induction coil L2, the secondary current flows in the secondary winding L22 of the second induction coil L2. As in the above-described experimental induction coil L3, an induced current flows. Therefore, as can be seen from the first experiment and the second experiment described above, the PLC signal of the home PLC modem 3a connected to one phase of the single-phase three-wire AC power line has the same phase, It can be injected into the other phase of the three-phase AC power line. That is, in FIG. 1, the home PLC modem 3a can communicate with the home PLC modem 3b and the home PLC modem 3c.

  In FIG. 1, a resistor R1 is a current limiting resistor that limits the current flowing through the primary winding L21 of the second induction coil L2. The capacitor C1 is a capacitor that prevents an alternating current having a commercial frequency (50 Hz or 60 Hz) from flowing through the primary winding L21 of the second induction coil L2.

  This capacitor C1 corresponds to C2 in the third experiment, and even if this capacitor C1 is used, as can be seen from the third experiment, the capacitor C1 is connected to one phase of the single-phase three-wire AC power line. There is almost no influence on the function of coupling the output signal of the connected home PLC modem 3a with the other phase of the single-phase three-wire AC power line.

  According to the PLC signal injection circuit 1b of the PLC signal gate device 10 for the single-phase three-wire AC power line in the present embodiment, between the neutral line of the single-phase three-wire AC power line and the power line of one phase, A circuit composed of the primary winding L21 of the second induction coil L2 is connected in series with the home PLC modem 3a. That is, the home PLC modem 3a is connected to the connection terminals J7 and J8 of the PLC signal injection circuit 1b by two-terminal connection.

  Accordingly, the home PLC modem 3a can be connected to the PLC signal injection circuit 1b of the PLC signal gate device 10 for the single-phase three-wire type AC power line by connecting with two terminals. It is possible to easily connect to a single-phase three-wire AC power line.

  Further, by using the PLC signal injection circuit 1b of the PLC signal gate device 10 for the single-phase three-wire AC power line, the single-phase three-wire AC power line is connected to the power line (for example, T phase) 8 of one phase. The PLC signal of the home PLC modem 3a can be injected into the power line (for example, R phase) 7 of the other phase of the single-phase three-wire AC power line in the same phase. Therefore, a PLC signal can be transmitted between different phases in a single-phase three-wire AC power line. Therefore, it is possible to perform power line communication by connecting a commercially available home PLC modem between different phases of a single-phase three-wire AC power line.

  The second induction coil L2 used in the PLC signal injection circuit 1b of the single-phase three-wire AC power line PLC signal gate device 10 includes two sets of primary winding L21 and secondary winding L22. It is the 2nd induction coil provided with the coil | winding. Therefore, the cost increase of the second induction coil can be suppressed as compared with the case where the second induction coil having three sets of windings in the power line communication device of the conventional example is used.

  Further, in the PLC signal injection circuit 1b of the PLC signal gate device 10 for the single-phase three-wire AC power line in the present embodiment, the number of windings of the primary winding L21 and the secondary windings of the second induction coil L2. The number of windings of L22 is the same. Therefore, the PLC signal of the home PLC modem 3a connected to the PLC signal gate device 10 for the single-phase three-wire AC power line is used for input / output of one phase of the single-phase three-wire AC power line and the other phase. Both can be injected at the same level.

  Further, in the PLC signal injection circuit 1b of the PLC signal gate device 10 for the single-phase three-wire AC power line in the present embodiment, a resistor R1 and a capacitor connected in series to the secondary winding L22 of the second induction coil L2. C1 is included. Of the resistor R1 and capacitor C1 connected in series, the capacitor C1 has a function of preventing the commercial frequency AC current from flowing through the secondary winding of the second induction coil L2, and the resistor R1 is: It has a function of suppressing the current flowing through the secondary winding L22 of the second induction coil L2 to be small.

  Therefore, the allowable current in the second induction coil L2 can be reduced, and the cost increase of the second induction coil L2 used in the single-phase three-wire AC power line PLC signal gate device 10 can be suppressed.

  Next, a first function of the PLC signal gate device for a single-phase three-wire AC power line in the embodiment of the present invention will be described. As described above, this first function is realized by the PLC signal gate circuit 1a shown in FIG. 1 including the first induction coil L1.

  As shown in FIG. 13, the first induction coil L1 includes a neutral wire winding L11 wound around a core formed of a magnetic material such as a donut-shaped ferrite, one phase winding L12, and It is composed of the other phase winding L13. The number of turns of the neutral wire winding L11, the one phase winding L12, and the other phase winding L13 is the same.

  As shown in FIG. 1, each of the three windings L11 to L13 of the first induction coil includes a neutral wire winding L11 in the middle of the neutral wire (N) 9 of the single-phase three-wire AC power line. One phase winding L12 is in the middle of one phase power line (eg, T phase) 8 of the phase three wire AC power line, and the other phase power line (eg, R phase) of the single phase three wire AC power line. ) 7, the other phase winding L13 is inserted in series. In FIGS. 1 and 13, J1a, J1b, and J1c are connection terminals. The first induction coil has a winding direction of one phase winding L12 and a winding direction of the other phase winding L13 in the first induction coil. It is configured to be opposite to the direction.

  In the PLC signal gate circuit 1a of the PLC signal gate device for a single-phase three-wire AC power line, the winding direction of one phase winding in the first induction coil L1 and the other phase winding are as described above. Is configured to be opposite to the winding direction of the neutral wire winding. This produces the following actions and effects.

  That is, as described above, in the power line communication using the home PLC modem on the power receiving side of the single-phase three-wire AC power line, the neutral line of the single-phase three-wire AC power line by the PLC signal injection circuit 1b described above ( N) The PLC signal of the home PLC modem is injected between the power line 9 (for example, the T phase) 8 and a single-phase three-wire AC power line in the same phase state. It is also injected between the neutral line (N) 9 and the power line (for example, R phase) 7 of the other phase.

  Then, in the first induction coil L1, the PLC signal of the home PLC modem receives the neutral line (N) 9, one phase power line (for example, T phase) 8, and the other phase power line (for example, R phase). ) 7 has the same phase, and the magnetic flux is strengthened in the first induction coil L1, so that the propagation of the PLC signal is prevented.

  Therefore, the PLC signal of the home PLC modem on the power receiving side of the single-phase three-wire AC power line can be prevented from propagating from the first induction coil L1 to the power supply side of the single-phase three-wire AC power line. . Therefore, it is possible to suppress the PLC signal flowing through the single-phase three-wire AC power line in the home from being radiated as noise radio waves from the single-phase three-wire AC power line outside the home.

  Further, in the single-phase three-wire AC power line to which the single-phase three-wire AC power line PLC signal gate device 10 is connected, as shown in FIG. 14, one of the single-phase three-wire AC power lines on the power supply side Phase power line (for example, T phase) 18 and the other phase power line (for example, R phase) 17 connected to outside PLC modem 2a, and the power receiving side of the single-phase three-wire AC power line Power line communication between the external PLC modem 2b connected between one phase power line (for example, T phase) 8 and the other phase power line (for example, R phase) 7 in FIG. There is also.

  As described above, in the PLC signal gate circuit 1a of the PLC signal gate device 10 for the single-phase three-wire AC power line, the first induction coil L1 is wound by one phase winding L12 in the first induction coil L1. The line direction and the winding direction of the other phase winding L13 are configured to be opposite to the winding direction of the neutral wire winding L11. That is, the winding direction of one phase winding L12 of the single-phase three-wire AC power line in the first induction coil L1 is the same as the winding direction of the other phase winding L13.

  Then, the PLC signal of the PLC PLC outside the house is transmitted through the first induction coil L1 to one phase power line (for example, T phase) 8 of the single-phase three-wire AC power line and the other phase power line (for example, R phase). 7 has an opposite phase and cancels out the magnetic flux in the first induction coil L1, so that the PLC signal is propagated in the first induction coil L1.

  Therefore, the PLC signal of the outside PLC modem on the power supply side of the single-phase three-wire AC power line can be propagated from the first induction coil L1 to the power receiving side of the single-phase three-wire AC power line. Therefore, in power line communication using an out-of-home PLC modem, a PLC signal flowing through a single-phase three-wire AC power line outside the home can flow into the single-phase three-wire AC power line inside the home.

  The PLC signal gate device 10 for the single-phase three-wire AC power line is provided at a branch point between the power supply side and the power reception side in the case of distributing power to the home by the single-phase three-wire distribution system. Can be built into the distribution board. That is, the distribution board provided with the PLC signal gate device 10 for the single-phase three-wire AC power line can be configured.

  FIG. 15 shows the configuration of such a distribution board 21 as an example. The distribution board 21 includes a breaker 21a and the PLC signal gate device 10 for the single-phase three-wire AC power line.

  According to this distribution board 21, the function of the breaker 21a and the function of the PLC signal gate device 10 for the single-phase three-wire AC power line can be realized in one place, and labor saving of these installation spaces can be achieved. You can plan.

  The single-phase three-wire AC power line PLC signal gate device 10 described above is a power meter used for measuring the amount of electric power when the single-phase three-wire power distribution system is distributed to the power receiving side such as a home. Can be built in. That is, a wattmeter including the above-described single-phase three-wire type AC power line PLC signal gate device can be configured.

  FIG. 16 shows such a configuration of the wattmeter 22 as an example. The wattmeter 22 includes a power integrating unit 22a and the single-phase three-wire AC power line PLC signal gate device 10 described above.

  According to the wattmeter 22, the function of the power integrating unit 22a and the function of the PLC signal gate device 10 for the single-phase three-wire AC power line can be realized at one place. Labor saving can be achieved.

1 is a configuration diagram of a PLC signal gate device for a single-phase three-wire AC power line in the present embodiment. FIG. It is a block diagram of the induction coil for experiment used for the experiment in this Embodiment. It is the circuit diagram (the 1) used for the 1st experiment in this Embodiment. It is the circuit diagram (the 2) used for the 1st experiment in this Embodiment. It is the circuit diagram (the 3) used for the 1st experiment in this Embodiment. It is the graph which showed the result of the 1st experiment in this Embodiment. It is the circuit diagram (the 1) used for the 2nd experiment in this Embodiment. It is the circuit diagram (the 2) used for the 2nd experiment in this Embodiment. It is the graph which showed the result of the 2nd experiment in this Embodiment. It is the circuit diagram (the 1) used for the 3rd experiment in this Embodiment. It is the circuit diagram (the 2) used for the 3rd experiment in this Embodiment. It is the graph which showed the result of the 3rd experiment in this Embodiment. It is the perspective view which showed the structure of the 1st induction coil L1 of the PLC signal gate apparatus for single-phase three-wire type AC power lines in this Embodiment. It is a block diagram of PLC communication by an outside PLC modem using the PLC signal gate device for single-phase three-wire AC power lines in the present embodiment. It is a block diagram of the electricity distribution panel in this Embodiment. It is a block diagram of the wattmeter in this Embodiment.

Explanation of symbols

1a PLC signal gate circuit 1b PLC signal injection circuit 2a External PLC modem 2b External PLC modem 3a Home PLC modem 3b Home PLC modem 3c Home PLC modem 4 Cable 5 Cable 6 Cable 7 R phase power line (R phase)
8 T-phase power line (T-phase)
9 Neutral wire (N)
10 PLC signal gate device for single-phase three-wire AC power line 11 Transmission side network analyzer 12 Reception side network analyzer 15 Primary side current direction 16 Secondary side current direction 17 R phase power line (R phase)
18 T-phase power line (T-phase)
19 Neutral wire (N)
21 Distribution board 21a Breaker 22 Power meter 22a Power integrating part C1 Capacitor C2 Capacitor J1 Connection terminal J1a Connection terminal J2 Connection terminal J2a Connection terminal J3 Connection terminal J3a Connection terminal J4 Connection terminal J5 Connection terminal J6 Connection terminal J7 Connection terminal J8 Connection terminal L1 First induction coil L11 Neutral wire winding L12 One phase winding L13 The other phase winding L2 Second induction coil L21 Primary side winding L22 Secondary side winding L3 Experimental induction coil L31 Primary side winding Wire L32 Secondary side winding T1 Primary side terminal T2 Primary side terminal T3 Secondary side terminal T4 Secondary side terminal R1 Resistance R2 Resistance W1 Wire W2 Wire W3 Wire

Claims (8)

A PLC signal gate device for a single-phase three-wire AC power line including a first induction coil inserted at a branch point between a power supply side and a power reception side in a single-phase three-wire AC power line,
The single-phase three-wire AC power line is a PLC of the home PLC modem between the neutral line of the single-phase three-wire AC power line and the one-phase power line on the power receiving side of the single-phase three-wire AC power line. When the signal is injected, the PLC signal is injected between the neutral line of the single-phase three-wire AC power line and the power line of the other phase while the PLC signal is in the same phase. Power line communication between the home PLC modems connected between the neutral line of the single-phase three-wire AC power line and one phase or the other phase of the single-phase three-wire AC power line. ,
The first induction coil is
Among the three windings provided in the first induction coil, a neutral wire winding is one of the single-phase three-wire AC power lines in the middle of the neutral wire of the single-phase three-wire AC power line. One phase winding is inserted in series in the middle of the phase power line, and the other phase winding is inserted in series in the middle of the other phase power line of the single-phase three-wire AC power line. With
The winding direction of the one phase winding and the winding direction of the other phase winding are configured to be opposite to the winding direction of the neutral wire winding. PLC signal gate device for single-phase three-wire AC power line. The PLC signal gate device for a single-phase three-wire AC power line according to claim 1,
A PLC signal gate device for a single-phase three-wire AC power line, wherein the number of windings of the neutral wire winding of the first induction coil, the one phase winding, and the other phase winding is the same. The PLC signal gate device for a single-phase three-wire AC power line according to claim 1 or 2,
The single-phase three-wire AC power line includes an external PLC modem connected between one phase power line and the other phase power line on the power supply side of the single-phase three-wire AC power line; Single-phase 3 which is an AC power line in which power line communication is performed between an external PLC modem connected between the power line of one phase and the power line of the other phase on the power receiving side of the 3-wire AC power line PLC signal gate device for linear AC power line. The PLC signal gate device for a single-phase three-wire AC power line according to any one of claims 1 to 3,
A primary circuit composed of a primary winding of a second induction coil is connected in series with the home PLC modem between the neutral line of the single-phase three-wire AC power line and the power line of one phase. As
The second induction coil in which an induction current having the same phase as the current flowing in the primary winding of the second induction coil flows between the neutral line of the single-phase three-wire AC power line and the power line of the other phase A secondary circuit in which at least the secondary windings are connected in series is connected,
The PLC signal phase injection is performed using the primary side circuit and the secondary side circuit, and for the single-phase three-wire AC power line including the primary side circuit and the secondary side circuit. PLC signal gate device. The PLC signal gate device for a single-phase three-wire AC power line according to claim 4,
A PLC signal gate device for a single-phase three-wire AC power line, wherein the number of primary windings of the second induction coil and the number of secondary windings are the same. The PLC signal gate device for a single-phase three-wire AC power line according to claim 4 or 5,
A PLC signal gate device for a single-phase, three-wire AC power line, wherein the secondary circuit includes a resistor and a capacitor connected in series.   A distribution board comprising the PLC signal gate device for a single-phase three-wire AC power line according to any one of claims 1 to 6.   A power meter comprising the PLC signal gate device for a single-phase three-wire AC power line according to any one of claims 1 to 6.

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