JP2007082124A - Apparatus for communication between different phase lines for indoor power line communication using single phase three-wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for communication between different phase lines for indoor power line communication capable of making communication between a low voltage line (L1-N system, L2-N system) and a high voltage line (line L1-line L2 system) which has been impossible by prior arts. <P>SOLUTION: The apparatus for communication between different phase lines for the indoor power line communication uses single phase three-wire lines comprising two power lines L1, L2 whose phases differ by 180 degrees and a neutral line N and is configured such that a series circuit comprising a primary winding L10 of a transformer 17 and a first capacitor C2 is connected between the line L1 and the neutral line N, a series circuit comprising a secondary winding L20 of the transformer 17 and a second capacitor C3 is connected between the line L2 and the neutral line N so that the polarity of the secondary winding is inverse to that of the primary winding, and the mutual inductance M between the primary winding and the secondary winding permits transmission/reception of a signal with a carrier whose frequency is sufficiently higher than that of a commercial power supply among a line L1-neutral line N system, a line L2-neutral line N system, and a line L1-line L2 system. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an inter-phase communication apparatus for indoor power line communication using single-phase three-wire in power line communication using an indoor power line as a communication line.

  Power line communication (PLC) that uses an indoor power line as a communication line has attracted attention. This is a technology for performing data communication and remote control of 2 Mbps to 30 Mbps by installing a communication adapter in an electrical outlet and connecting a personal computer or an electric appliance. By using this technique, it is possible to construct a local communication network (LAN) or an intranet without newly laying a cable or the like indoors.

  In general indoor wiring, a single-phase three-wire 100V is used, and there are two types of L1 phase and L2 phase having a phase difference of 180 degrees with a neutral wire N as a common wire. It is used as 200V between L2.

  FIG. 3 is a system diagram showing a schematic configuration of an indoor distribution board of single-phase three-wire power lines. The distribution board wiring is composed of an L1 line electrode plate 11, an L2 line power plate 12, and a neutral line N electrode plate 13, and is divided into two systems. A voltage of AC100V is applied to the L1-N system and the L2-N system, respectively, and AC200V can be taken out between L1-L2.

  FIG. 4 is a distribution system diagram showing an example in which a single-phase three-wire power line is used as a communication line. PCs (personal computers) 21 to 23 are connected to the L1-N system (AC100V) via a breaker 14. The L2-N system (AC100V) is connected to the PCs 24, 25 and the television 26 via the breaker 14, and the L1-L2 system (AC200V) is connected to the cooler 27 via the breaker 14. Yes. In the figure, 15 is a leakage breaker provided between the low voltage distribution line and the power line, and 16 is an overvoltage detection lead wire. As shown in FIG. 4, the PCs 21 to 23 in the same system and the PCs 24 and 25 and the television 26 can communicate with each other. However, between devices having different systems, for example, between the PC 21 and the PC 24 or between the PC 23 and the cooler. 27 cannot communicate.

  As a method for realizing communication between the L1 line system and the L2 line system, as shown in FIG. 5, there is a method of connecting the L1 line electrode plate 11 and the L2 line electrode plate 12 with a capacitor C1 (for example, Patent Document 1). reference).

  This capacitor C1 constitutes a high-pass filter, and can pass only high-frequency (2 MHz to 30 MHz) signals without passing through low-frequency commercial power (50 Hz, 60 Hz). And communication between the L2-N systems.

JP-A-10-208184

  However, in the method of connecting the L1 line electrode plate 11 and the L2 line electrode plate 12 with the capacitor C1, the same signal 1 flows through the L1 line and the L2 line as shown in FIG. The signal 1 cannot be taken out between the line and the L2 line, and communication between the low voltage line system and the high voltage line system is not possible.

  The present invention is a different phase for indoor power line communication that enables communication between a low-voltage line (L1-N system, L2-N system) and a high-voltage line (L1-line-L2-line system), which was impossible with the prior art. An object is to provide an intercommunication device.

  In order to solve the above-mentioned problems, the present invention is an inter-phase communication apparatus for indoor power line communication using a single-phase three-wire composed of two power lines of L1 line and L2 line and a neutral line N that are 180 degrees out of phase. A series circuit of a transformer primary winding and a first capacitor is connected between the L1 line and the neutral line N, and a secondary circuit of the transformer is connected between the L2 line and the neutral line N. A series circuit of a winding and a second capacitor is connected so that the secondary winding is in reverse phase with respect to the primary winding, and the mutual inductance between the primary winding and the secondary winding causes the L1 line − It is characterized in that a signal having a carrier wave sufficiently higher than the frequency of the commercial power supply is exchanged between the neutral line N system, the L2 line-neutral line N system, and the L1-line-L2 line system. The inter-phase communication apparatus for indoor power line communication using single-phase three-wire.

  In the present invention, for example, when an AC signal e1 having a carrier of 2 MHz to 30 MHz is applied between the L1 line and the neutral line N, the mutual inductance −M (M> of the primary winding and secondary winding of the transformer 0) induces a signal e2 corresponding to the AC signal e1 between the L2 line and the neutral line N. That is, the AC signal e1 is transmitted to the L2 line. Further, a differential voltage e3 = e1-e2 appears between the L1 line and the L2 line. Here, since the primary winding and the secondary winding are in an antiphase relationship, e1 and e2 are in antiphase. Therefore, a signal obtained by amplifying the signal e1 appears as e3. In this way, signals can be transmitted not only between the low-voltage lines but also between the low-voltage lines and the high-voltage lines.

  In the first capacitor and the second capacitor, the commercial power (50 Hz, 60 Hz) transmitted between the neutral wire N and the L1 wire and between the neutral wire N and the L2 wire is not short-circuited by the primary winding and the secondary winding. In order to do so, it has a function of allowing only a high frequency signal carrier wave to pass through.

  According to the present invention, a series circuit of the transformer primary winding and the first capacitor is connected between the L1 line and the neutral line N, and the transformer secondary is connected between the L2 line and the neutral line N. Since the series circuit of the winding and the second capacitor is connected so that the secondary winding is in reverse phase with respect to the primary winding, the mutual inductance between the primary winding and the secondary winding causes the L1 line to be in the middle The signal line can be exchanged between the sex line N system, the L2 line-neutral line N system, and the L1 line-L2 line system. Communication between the L1-N system and the L2-N system) and the high voltage line (L1 line-L2 line system) becomes possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a basic configuration of the present invention, and FIG. 2 is a distribution system diagram showing an embodiment of the present invention.

  As shown in FIG. 1, the L1 line system and the L2 line system are coupled by a coupling circuit 18 including a transformer 17 and capacitors C2 and C3. Specifically, a series circuit of an inductance L10 and a capacitor C2 constituting the primary winding of the transformer 17 is connected to terminals of the L1 wire electrode plate 11 and the neutral wire N electrode plate 13, and the L2 wire electrode plate 12 and a terminal of the neutral wire N electrode plate 13 are connected to a series circuit of an inductance L20 and a capacitor C3 that constitute a secondary winding of the transformer 17. The inductances L10 and L20 are connected so that their phases are opposite to each other, and the inductances L10 and L20 are coupled by a mutual inductance −M (M> 0). Capacitors C2 and C3 are inserted for the purpose of cutting signals of 1 kHz or less including a commercial power frequency of 50 Hz or 60 Hz. The capacitors C2 and C3 enable signals to be transmitted between the L1 line and the L2 line via the mutual inductance -M of the transformer 17 only in the signal band. Capacitors C2 and C3 prevent the L1 line and the neutral line N and the L2 line and the neutral line N from being short-circuited.

The current passing through the inductance L10 is i ₁ , the voltage between the L1 line and the neutral line N is e ₁ , the current passing through the inductance L20 is i ₂ , and the voltage between the L2 line and the neutral line N is e _2. Then, the following equation is established.

Here, if i ₁ = I ₁ sin ωt and i ₂ = I ₂ sin (ωt + α), equations (1) and (2) are as follows. Where ω is the angular velocity of the injected signal and α is the phase.

For simplicity, if I ₂ = 0, equations (3) and (4) are as follows.

  Thus, a signal corresponding to the angular velocity ω of the signal injected from the L1-N system is transmitted to the L2-N system.

On the other hand, a signal e ₃ = e ₁ -e ₂ is detected between the L1 line and the L2 line which are high voltage lines. This can be expressed using the equations (5) and (6) as follows.

  In the equation (7),

でない限り、ｅ₃として、Ｌ１−Ｎ系統から注入された信号の角速度ωに応じた信号が伝達される。

Unless otherwise, a signal corresponding to the angular velocity ω of the signal injected from the L1-N system is transmitted as e ₃ .

  In this way, communication can be realized not only between the 100V L1 line system and the L2 line system but also between the 100V system and the 200V system.

  FIG. 2 is a power distribution system diagram showing an embodiment of the present invention. PCs 21 to 23 are connected to the L1-N system (AC100V) via a breaker 14, and PCs 24 and 25 and a television 26 are connected to the L2-N system (AC100V) via a breaker 14. The cooler 27 is connected to the L1-L2 system (AC200V) via the breaker 14. In the figure, 15 is a leakage breaker provided between the low voltage distribution line and the power line, and 16 is an overvoltage detection lead wire.

  Since the coupling circuit 18 including the transformer 17 and the capacitors C2 and C3 shown in FIG. 1 is connected to the L1 line system and the L2 line system, between the PCs 21 to 23 in the same system, the PCs 24 and 25, and the television 26 Communication between devices having different systems, for example, between the PC 21 and the PC 24 or between the PC 23 and the cooler 27 becomes possible.

  In the present embodiment, a 5 m power line is connected to each system (L1-N system, L2-N system, L1-L2 system) and the coupling circuit 18 having the configuration shown in FIG. As a result of evaluating the transmission characteristics with, it was confirmed that transmission was possible. By appropriately selecting the circuit constants of the self-inductances L10 and L20, the mutual inductance M, and the capacitors C2 and C3 of the transformer 17, mutual communication at 2 to 30 MHz is possible.

  Incidentally, in the test circuit, the self-inductance L10 = L20 = 5 to 20 μH, the mutual inductance M = 4.5 to 18 μH, and the capacitance C2 of the capacitors C2 and C3 = C3 = 5 to 20 nF. The mutual inductance M has the following relationship with the self-inductances L10 and L20, where k is the coupling coefficient.

  In this example, k = 0.9. If the values of the capacitors C2 and C3 and the self-inductances L10 and L20 are within the above ranges, the low frequency can be cut in the transmission characteristics, and a flat characteristic in the signal band can be obtained.

  The present invention is an inter-phase communication device that enables communication between a low-voltage line (L1-N system, L2-N system) and a high-voltage line (L1-line-L2-line system), which was impossible with conventional technology. The present invention can be applied to the field of indoor power line communication using single-phase three wires.

It is a circuit diagram which shows the basic composition of this invention. It is a power distribution system diagram showing an embodiment of the present invention. It is a systematic diagram which shows schematic structure of the indoor distribution board of a single phase 3 wire power line. It is a power distribution system figure which shows the example which used the single phase 3 wire power line as a communication line. It is a distribution system diagram which shows a prior art. It is a circuit diagram which shows the problem of a prior art.

Explanation of symbols

11 L1 Wire Electrode Plate 12 L2 Wire Power Plate 13 Neutral Wire N Electrode Plate 14 Breaker 15 Earth Leakage Breaker 16 Overvoltage Detection Lead Wire 17 Transformer 18 Coupling Circuit 21-25 PC (Personal Computer)
26 TV 27 Cooler L10, L20 Self-inductance M Mutual inductance

Claims (2)

A phase-to-phase communication apparatus for indoor power line communication using a single-phase three-wire composed of two power lines of L1 line and L2 line and a neutral line N that are 180 degrees out of phase,
A series circuit of a transformer primary winding and a first capacitor is connected between the L1 line and the neutral line N,
A series circuit of a secondary winding of the transformer and a second capacitor is connected between the L2 line and the neutral line N so that the secondary winding is in reverse phase with respect to the primary winding,
Due to the mutual inductance between the primary winding and the secondary winding, the frequency of the commercial power source between the L1 line-neutral line N system, the L2 line-neutral line N system, and the L1 line-L2 line system The inter-phase communication apparatus for indoor power line communication using single-phase three-wire, characterized in that a signal having a sufficiently high carrier wave is exchanged.   The inter-phase communication apparatus for indoor power communication using single-phase three-wire according to claim 1, wherein the frequency of the signal is 2 to 30 MHz.

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