JP2023074328A - Power line communication system and cubicle - Google Patents

Abstract

To provide a power line communication system and a cubicle, capable pf securing appropriate communication quality in narrow band power line communication.SOLUTION: A facility system 101 includes a power line communication system 100 comprising: an origination unit 6 that is electrically connected to a transformer 31 for changing voltage, using a cable way W6 and a cable way W7 and originates a signal in narrow band power line communication; a reception unit 4 that is electrically connected to the origination unit and receives the signal; and a promotion unit 33 that is provided directly under the transformer 31 on the cable way W6 and promotes a flow of the signal from the origination unit 6 to the reception unit 4.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to power line communication systems and cubicles.

2. Description of the Related Art Power line communication (PLC (Power Line Communication)) for transmitting a signal by superimposing it on a power line has been conventionally known. Patent Literature 1 discloses a power line communication device including one or more communication devices connected to a power line and capable of communicating via the power line. Japanese Unexamined Patent Application Publication No. 2002-100002 discloses a printer main body that is connected to a power line and performs power line communication, and a PC main body that performs power line communication with the printer main body via the power line. The printer main body is connected to a power line communication section that performs power line communication with the PC main body, and transmits/receives the signal to/from the power line communication section via a control line. The PC body has a PCI board. The power line communication unit and the PCI board each have a driver receiver for transmitting and receiving power line communication signals.

JP-A-2004-165950

In power line communication, when a signal is transmitted from the signal transmitter to the receiver that receives the signal, part of the signal is transmitted from the transmitter to the power supply side opposite to the receiver. It may be difficult to transmit to the receiver side. For example, in the configuration disclosed in Japanese Patent Laid-Open No. 2002-200012, there is a risk that a signal output from the PC to the printer may not be properly transmitted to the printer. In this case, it becomes difficult for the signal from the transmitting unit to reach the receiving unit, so the quality of communication cannot be properly ensured.

An object of the present disclosure is to provide a power line communication system and a cubicle capable of ensuring appropriate communication quality in narrowband power line communication.

A power line communication system according to one aspect of the present disclosure is electrically connected by a transformer that changes voltage and a first electric line, and is electrically connected to a transmission unit that transmits a signal in narrowband power line communication and the transmission unit, A receiver that receives a signal, and an facilitating section that is provided immediately below the transformer of the first electric line and promotes the flow of the signal from the transmitter to the receiver.

In this power line communication system, a transformer and a transmitter are electrically connected, and a transmitter and a receiver are electrically connected. Since the facilitating section is provided directly below the transformer, it is possible to promote the flow of the signal from the transmitting section to the receiving section in the first electric line upstream of the transmitting section. Thereby, the receiving section can appropriately acquire the signal from the transmitting section. Therefore, this power line communication system can ensure appropriate communication quality.

In the power line communication system according to one embodiment, the receiving unit is electrically connected to the transmitting unit by the second electric line, and the promoting unit adjusts the impedance of the first electric line to be higher than the impedance of the second electric line. good. In this case, since the impedance of the first electric line becomes higher than the impedance of the second electric line due to the adjustment of the promoting section, the signal from the transmitting section flows more easily through the second electric line than through the first electric line. Therefore, the promoting unit can promote the flow of signals from the transmitting unit to the receiving unit, and can ensure appropriate communication quality.

The power line communication system according to one embodiment further includes a distribution board that accommodates a main breaker provided in the first electric line between the transformer and the transmission unit, and the promotion unit is outside the distribution board and includes the transformer and the distribution board. In this case, the promotion unit is installed outside the distribution board and directly below the transformer. This power line communication system can reduce the number of man-hours for installing a promotion unit for each distribution board, and collectively promote the flow of signals to each distribution board.

In the power line communication system according to one embodiment, the frequency of the signal may be between 10 kHz and 450 kHz.

In the power line communication system according to one embodiment, the facilitating unit may be provided in at least one phase electric line among the first electric lines divided into three phases. In this case, for example, the facilitating section can exhibit the effect of facilitating the flow of the signal if it is provided in the electrical path to which at least the transmitting section and the receiving section are connected. Therefore, in this power line communication system, the number of promotion units to be installed can be minimized, and installation and maintenance of the promotion units can be facilitated.

According to another aspect of the disclosure, a cubicle is provided. The cubicle is a cubicle connected to a power line communication system including a transmission unit that transmits a signal and a reception unit that receives a signal in narrowband power line communication, is electrically connected to the power line communication system by a first electric line, and has a voltage and an facilitating section provided immediately below the transformer for facilitating signal flow to the opposite side of the transformer.

In this cubicle, the transformer and the power line communication system are electrically connected by the first electric line. Since the promoting section is provided directly below the transformer, it is possible to promote the flow of signals from the transmitting section to the receiving section in the cubicle upstream of the transmitting section. Thereby, the receiving section can appropriately acquire the signal from the transmitting section. Therefore, this cubicle can ensure appropriate communication quality. Also, for example, it is not necessary to provide a promotion unit for each distribution board connected to the cubicle. The facilitating section provided in the cubicle can collectively promote the flow of signals in the electrical paths downstream of the cubicle.

In the cubicle according to one embodiment, the cubicle is electrically connected to the transformer by the first electric line, and has a plurality of breakers provided between the transformer and the transmitter, and the facilitation unit is provided between the transformer and the breaker. may be provided in In this case, the man-hours for installing the facilitation section and the man-hours for maintenance can be reduced by installing the facilitation section between the transformer and the breaker, compared to the case where the facilitation section is installed and maintained downstream of each breaker. can be done.

According to the power line communication system and cubicle according to the present disclosure, appropriate communication quality can be ensured in narrowband power line communication.

1 is a block configuration diagram showing a power line communication system according to one embodiment; FIG. FIG. 2(a) is a block configuration diagram of a detection child device, FIG. 2(b) is a block configuration diagram of a receiving section, and FIG. 2(c) is a block configuration diagram of a transmitting section. 1 is a schematic configuration diagram showing an example of a power line communication system and a cubicle according to one embodiment; FIG. It is a schematic block diagram which shows the structure of a distribution board. It is a schematic block diagram which shows the structure of the cubicle which concerns on one Embodiment. FIG. 5 is a schematic configuration diagram showing the configuration of a cubicle according to a modification; FIG. 11 is a schematic configuration diagram showing a power line communication system according to a modification; (a) of FIG. 8 is a circuit diagram of a power line communication system according to a comparative example before installation of a transformer and a promotion section. FIG. 8(b) is a graph of experimental results showing the signal spectrum in the receiving section before installation of the transformer and the enhancement section. (a) of FIG. 9 is a circuit diagram after installation of a transformer and before installation of a promotion unit in a power line communication system according to a comparative example. FIG. 9(b) is a graph of experimental results showing the signal spectrum in the receiving section after installation of the transformer and before installation of the enhancement section. (a) of FIG. 10 is a circuit diagram after installation of the transformer and the acceleration unit in the power line communication system according to the embodiment. FIG. 10(b) is a graph of experimental results showing the signal spectrum at the receiving section after installation of the transformer and the enhancement section.

Embodiments of the present disclosure will be described below with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and redundant description will not be repeated. The dimensional proportions of the drawings do not necessarily match those of the description. The terms "upper", "lower", "left", and "right" are based on the illustration and are for convenience.

FIG. 1 is a block configuration diagram showing a power line communication system 100 according to an embodiment of the invention. As shown in FIG. 1, the power line communication system 100 is a system that transmits information between devices by power line communication (PLC: Power Line Communication) that superimposes and transmits signals on power lines. In power line communication, for example, a communication signal with a frequency different from the commercial frequency is superimposed on a power waveform of the commercial frequency and transmitted, and a communication signal with a different frequency is separated from the power waveform and received. It is a communication method for transmitting and receiving signals. Depending on the frequency band, power line communication may be subject to the Radio Law. However, the power line communication system 100 according to the present embodiment is a system capable of executing narrowband power line communication (low-speed PLC) in which signals in the frequency band of 10 kHz to 450 kHz are superimposed on the power line and transmitted. The power line communication system 100 uses narrow-band power line communication so that it can be used both indoors and outdoors, and in order to achieve a certain amount of data transfer. Hereinafter, a signal transmitted by narrowband power line communication is simply referred to as a signal. Further, since narrowband power line communication is used, the modulation method is not particularly limited, and the OFDM method or the DCSK method may be adopted.

The power line communication system 100 includes a detector 1 , a detection slave device 2 , controlled equipment 3 , a receiver 4 and a transmitter 6 . For example, the power line communication system 100 may be applied to a building BD1 having multiple floors F1-F3 (see FIG. 3).

In the power line communication system 100, the detector 1 and the detector slave unit 2 are connected by a wiring W1. The detection slave device 2 and the transmission unit 6 are connected by a power line W2. The equipment to be controlled 3 and the receiving unit 4 are connected by a wiring W3. The receiving unit 4 and the transmitting unit 6 are connected by a power line W4. The main purpose of the power line is wiring for supplying commercial-frequency AC power, and it serves as a transmission path for power line communication. Specifically, power line communication is performed between the detecting slave device 2 and the receiving unit 4 and the transmitting unit 6 . Power line communication is performed between the detector 1 and the detector slave unit 2 and between the controlled equipment 3 and the receiving unit 4 . In power line communication, a communication signal can be superimposed not only on alternating current power distribution such as AC100V or AC200V, but also on direct current power distribution in the same way as alternating current. When the detector 1 is, for example, a motion sensor or an illuminance meter, the signal from the detector 1 passes through the transmission unit 6 once, and the power line communication is sent to the reception unit 4 by the judgment of the transmission unit 6. It may be done. However, depending on the program of the transmission unit 6, it is also possible for the detection slave device 2 to exchange commands with the reception unit 4 using power line communication without going through the transmission unit 6. FIG.

The detector 1 is a device that detects various types of information, and is composed of measuring instruments, sensors, and the like. As the detector 1, for example, a human sensor that detects the presence of a person, an illuminance meter that detects the brightness in the room, an ammeter that detects the current value, and the like are adopted. The detector 1 outputs detection information to the detector slave device 2 via the wiring W1. It should be noted that the detector 1 is not limited to the equipment described above, and other measuring instruments and sensors may be employed. For example, a measuring instrument that monitors the amount of power generated by renewable energy, such as a solar battery, may be employed as the detector 1 . Further, the detector 1 may be a battery remaining amount data output unit provided in a power controller such as a stationary storage battery or a vehicle-mounted storage battery. Alternatively, the detector 1 may be a carbon dioxide detector, a carbon monoxide detector, a dust detector, or the like.

The detection child device 2 is a child device provided for the detector 1 . The detection slave unit 2 converts the detection information received from the detector 1 into a signal for power line communication, and outputs the signal to the transmission unit 6 via the power line W2. The detector slave units 2 are provided in one-to-one correspondence with respect to one detector 1 . For example, when there are a plurality of detectors 1 on the floor, one detector slave unit 2 is provided for each detector 1 . For example, a dedicated slave device 2 is provided for an ammeter, a dedicated slave device 2 is provided for a human sensor, and a dedicated slave device 2 is provided for an illuminometer. When there are a plurality of human sensors, a dedicated detection slave device 2 is provided for each human sensor. The detection slave unit 2 is provided at a position close to the target detector 1 . Detector slave unit 2 is provided on a power line connected to target detector 1 , thereby physically establishing a one-to-one relationship with target detector 1 . Note that the detection slave device 2 and the detector 1 may be constructed as one device. In this case, a unit that functions as the detector slave unit 2 and a unit that functions as the detector 1 are provided in one device. Moreover, both are connected by wiring W1 within one device. A wiring W1 connecting the detector 1 and the detector slave unit 2 is configured by a signal line. Note that the slave detectors 2 and detectors 1 do not necessarily have a one-to-one relationship.

A detailed block configuration of the detection slave device 2 will be described with reference to FIG. FIG. 2(a) is a block configuration diagram of the detection slave unit. The detection slave device 2 includes a communication unit 11 , a processing unit 12 and a storage unit 13 . The communication section 11 is a unit that communicates with the transmission section 6 and the detector 1 . The communication unit 11 has a circuit that receives detection information from the detector 1 . The communication unit 11 also has a circuit for converting detection information from the detector 1 into a power line communication signal for the transmission unit 6 . The processing unit 12 is a unit that controls the operation of the detection slave device 2 as a whole. The processing unit 12 includes a microprocessor, its peripheral circuits, and the like.

The storage unit 13 is a unit that stores a program required for the operation of the detection slave device 2, information required for the operation, and the like. The storage unit 13 includes, for example, a non-volatile storage element such as a ROM (Read Only Memory), a rewritable non-volatile storage element such as an EEPROM (Electrically Erasable Programmable Read Only Memory), and a working memory such as a RAM (Random Access Memory) and other volatile storage elements. For example, the storage unit 13 stores an address indicating the position of the detection slave device 2 within the building BD1.

The controlled equipment 3 shown in FIG. 1 is equipment to be controlled by the power line communication system 100 . Examples of the equipment to be controlled 3 include lighting (such as LED lighting) capable of adjusting indoor illuminance, air conditioning for adjusting indoor temperature, and a storage battery for adjusting discharge and charge. The controlled equipment 3 receives the control information from the receiver 4 via the wiring W3. Note that the equipment to be controlled 3 is not limited to the equipment described above, and other equipment may be employed.

The receiving unit 4 is a slave unit provided for the controlled equipment 3 . The receiver 4 is electrically connected to the transmitter 6 and receives signals. The receiving unit 4 converts the control information by the power line communication signal received from the transmitting unit 6 into a signal that can be processed by the controlled equipment 3, and outputs the signal to the controlled equipment 3 via the wiring W3. The receiving unit 4 is provided in a one-to-one correspondence with respect to one controlled equipment 3 . For example, if there are a plurality of controlled equipment 3 on the floor, one receiver 4 is provided for each controlled equipment 3 . In the example shown in FIG. 3, one dedicated receiver 4 is provided for each of a plurality of lights. The receiving unit 4 is provided at a position close to the target controlled equipment 3 . The receiving unit 4 is provided on the power line connected to the target controlled equipment 3 , thereby physically establishing a one-to-one relationship with the target controlled equipment 3 . In addition, the receiving part 4 and the controlled equipment 3 may be constructed as one piece of equipment. For example, an LED lighting device with a slave device may be adopted. In this case, a unit that functions as the receiver 4 and a unit that functions as the equipment to be controlled 3 are provided in one piece of equipment. Moreover, both are connected by wiring W3 within one device. The receiving unit 4 may be provided on the same power line as that to which the equipment to be controlled is connected. In this case, the wiring W3 is configured by the power line. Alternatively, the receiving unit 4 may be connected to a power line separate from the target controlled equipment, and in this case, the wiring W3 is configured by a signal line. Note that the receiving unit 4 and the controlled equipment 3 do not necessarily have a one-to-one relationship.

The receiving unit 4 adjusts the strength of the output of the controlled equipment 3 based on the control information from the transmitting unit 6 . For example, the receiver 4 can generate a command signal for lighting so as to adjust the intensity of the illumination of the lighting. The receiving unit 4 can generate a command signal for the air conditioning so as to adjust the strength of the output of the air conditioning.

A detailed block configuration of the receiver 4 will be described with reference to FIG. FIG. 2(b) is a block configuration diagram of the receiving section. The receiving unit 4 includes a communication unit 14 , a processing unit 16 and a storage unit 17 . The communication unit 14 is a unit that communicates with the transmission unit 6 and the controlled equipment 3 . The communication unit 14 has a circuit for receiving control information from the power line communication signal from the transmission unit 6 . The communication unit 14 also has a circuit for converting the power line communication signal from the transmission unit 6 into a signal that can be processed by the controlled equipment 3 . The processing section 16 is a unit that controls the operation of the entire receiving section 4 . The processing unit 16 includes a microprocessor, its peripheral circuits, and the like. The storage unit 17 is a unit that stores a program necessary for the operation of the receiving unit 4, information necessary for the operation, and the like. The storage unit 17 may include storage elements similar to those exemplified for the storage unit 13 . For example, the storage unit 17 stores an address indicating the position of the receiving unit 4 inside the building BD1.

The transmission unit 6 shown in FIG. 1 is a device that receives detection information from the detection child device 2 and transmits control information (control signal) to the reception unit 4 based on the detection information. The transmitting unit 6 is a parent unit for the detecting child unit 2 and the receiving unit 4 . The transmission unit 6 receives the detection information by the signal of power line communication from the detection child device 2 via the power line W2. The transmission unit 6 transmits a signal in narrowband power line communication. The transmitter 6 outputs the control information by the power line communication signal to the receiver 4 via the power line W4. The transmission unit 6 calculates control information for each controlled equipment 3 based on at least one of preset setting contents and detection information detected by the detector 1 .

A detailed block configuration of the transmission unit 6 will be described with reference to FIG. 2(c). FIG. 2(c) is a block diagram of the transmitter. The transmission unit 6 includes a communication unit 21 , a processing unit 22 and a storage unit 23 . The communication unit 21 is a unit that communicates with the detection child device 2 and the reception unit 4 . The communication unit 21 has a circuit for performing power line communication with the detection child device 2 and the reception unit 4 . The communication unit 21 also has a circuit for remote communication using an external communication device and the cloud. That is, the communication unit 21 of the transmission unit 6 includes a PLC communication unit that manages power line communication between the detection child device 2 and the reception unit 4, and a wireless communication unit such as LTE that manages network communication with the cloud side. The processing section 22 is a unit that controls the operation of the transmission section 6 as a whole. The processing unit 22 includes a microprocessor, its peripheral circuits, and the like. The processing unit 22 calculates control information for controlling ON/OFF switching of each lighting and air conditioning, adjustment of output intensity, and the like.

The storage unit 23 is a unit that stores a program necessary for the operation of the transmission unit 6, information necessary for the operation, and the like. The storage unit 23 may include storage elements similar to those exemplified for the storage unit 13 . For example, the storage unit 23 stores addresses indicating the positions of the transmission unit 6, each detection slave device 2, and each reception unit 4 in the building BD1 in a state of being associated with each other.

Here, the transmitting unit 6 shown in FIG. 1 is installed in a power distribution facility 50 that serves as a base point of an electric circuit for a plurality of receiving units 4 within a control range of the transmitting unit 6 and the detection slave unit 2 . The power distribution equipment 50 is equipment for distributing and supplying power to the plurality of receiving units 4 and the detecting slave units 2 existing within the control target range of the transmitting unit 6 . The power distribution equipment 50 has a plurality of receivers 4 and a power supply unit 51 that supplies power to the detection slave unit 2 . A power supply unit 51 of the power distribution equipment 50 corresponds to a power supply unit serving as a base point of an electric circuit for a plurality of receiving units 4 within a control range of the transmitting unit 6 and the detection slave unit 2 . A transmission unit 6 is provided for the power supply unit 51 . The transmission unit 6 is provided closer to the power supply unit 51 than the detection child device 2 and the reception unit 4 are. Such a power distribution facility 50 is, for example, a distribution board provided for the building BD1. Moreover, as such a power supply unit 51, there is a main breaker of a distribution board. The base point of the electric path is the most upstream point of the power flow in the wiring network of the power line in which the plurality of receivers 4 and the detector units 2 are present within the control range. That is, even if another distribution board exists in the middle of the wiring network, the distribution board does not correspond to the base point of the electric circuit.

A state in which the transmission unit 6 is installed in the power distribution equipment 50 is a state in which the transmission unit 6 is incorporated in the wiring structure of the power line of the power distribution equipment 50 . A state in which the power supply unit 51 is provided with the transmission unit 6 is a state in which the transmission unit 6 is electrically connected to a power line drawn from the power supply unit 51 . When the power distribution equipment 50 has a plurality of branched power lines that are pulled out from the housing, the transmission unit 6 superimposes a power line communication signal on each branched power line. Connected to the power line. When such an electrical connection relationship is established, the arrangement of the transmitter main body of the transmitter 6 is not particularly limited. Specifically, the transmission unit main body of the transmission unit 6 is arranged inside the housing of the distribution equipment 50 (for example, the housing of the distribution board 10 described later), and the transmission unit 6 is placed inside the distribution equipment 50 may be connected within the wiring structure inside the housing of the Alternatively, the transmitting unit body of the transmitting unit 6 may be arranged outside the housing of the power distribution equipment 50 and the transmitting unit 6 may be connected to the wiring structure inside the housing of the power distribution equipment 50 . In this case, the transmission unit main body of the transmission unit 6 is attached to the outside of the door surface or the side surface of the power distribution equipment 50, and the wiring is inserted from the hole formed in the housing, and the inside of the housing of the power distribution equipment 50. wiring structure.

Next, an example of the power line communication system 100 will be described with reference to FIG. FIG. 3 is a schematic configuration diagram showing an example of a power line communication system and a cubicle according to one embodiment. FIG. 3 shows an example in which the power line communication system 100 is adopted for the facility system 101 of the building BD1 having multiple floors F1 to F3. Note that the detector 1 and the detector slave unit 2 are omitted in FIG. A building BD1 to which the power line communication system 100 is applied is, for example, facilities such as an apartment complex, an office, a store, a factory, and a hospital. The power line communication system 100 includes a receiver 4 and a transmitter 6 . The power line communication system 100 further includes an facilitator 33 . Power line communication system 100 further includes power supply 7 , distribution boards 10</b>A, 10</b>B, 10</b>C, and cubicle 20 . The power source 7 is a source of high-voltage current, such as a power plant. The equipment system 101 shown in FIG. 3 includes a cubicle 20 outside the building BD1. The facility system 101 also includes distribution boards 10A, 10B, and 10C on the respective floors F1, F2, and F3.

The cubicle 20 is connected by a power line W7 to a transmitter 6 that transmits a signal in narrowband power line communication and a receiver 4 that receives the signal. The cubicle 20 is a facility containing equipment that converts high voltage from a power plant into voltage that can be used at the facility. The cubicle 20 includes a transformer 31 that changes the voltage, a plurality of (here, three) breakers 32 that cut off overcurrent, a facilitating section 33 provided between the transformer 31 and the plurality of breakers 32, and other devices. Consists of The transformer 31 is connected to a power line W5 through which a high voltage current from the power supply 7 flows. Further, the transformer 31 is connected to one facilitating section 33 and three breakers 32 via power lines W6 in the housing of the cubicle 20, respectively. Three power lines W6 connected to the three breakers 32 are pulled out from the housing of the cubicle 20, extend into the building BD1, and are connected to the distribution boards 10A, 10B, and 10C on each floor. The breaker 32 for the first floor is connected to the distribution board 10A on the floor F1 via the power line W7. The breaker 32 for the second floor is connected to the distribution board 10B on the floor F2 via the power line W7. The breaker 32 for the third floor is connected to the distribution board 10C on the floor F3 via the power line W7. The transformer 31 is electrically connected to the transmission unit 6 by power lines W6 and W7 (an example of a first electric line).

The distribution boards 10A, 10B, and 10C are electrical equipment that branch the power sent by the power line W7 to load circuits provided in the floor. Each of the distribution boards 10A, 10B, and 10C has a wiring structure in which circuit breakers for wiring, earth leakage circuit breakers, and the like are collectively installed and wired. The distribution board 10A on the first floor supplies power by branching to a plurality of (here, two) power lines W8. A plurality of receivers 4 and controlled equipment 3 (illumination in FIG. 3) are connected to each power line W8. In addition, the load equipment which is not provided with the receiving part 4 may be connected to some power lines W8. Hierarchies F2 and F3 have the wiring structure of the power line W8 of the same meaning as hierarchy F1, the receiving part 4, the controlled object equipment 3, and load equipment.

In the example shown in FIG. 3, the control range of the transmitting unit 6 is the receiving unit 4 provided in a predetermined floor (here, the floor F1) of the building BD1. Here, the distribution board 10A for the floor F1 of the building BD1 is the base point of the electric circuit. That is, the distribution board 10A corresponds to the power distribution equipment 50 that is the base point of the electric circuit, and the main breaker 52 provided in the distribution board 10A corresponds to the power supply unit 51 that is the base point of the electric circuit. Therefore, the transmission unit 6 is provided in the power supply unit 51 which is the base point of the electric circuit. The transmission unit 6 is provided downstream of the main breaker 52, for example. Here, downstream refers to the side of the power line W8 connected to the controlled equipment 3 to which power is supplied when viewed from the power line W5 close to the power source 7 . As described above, the transmission unit 6 is electrically connected to the transformer 31 of the cubicle 20 by the power line W6 and the power line W7 (an example of the first electric line). In addition, the receiving unit 4 and the controlled equipment 3 are electrically connected to the transmitting unit 6 and the power line W8 (an example of the second electric line).

Next, the internal configuration of the distribution board 10A will be described with reference to FIG. As shown in FIG. 4, the distribution board 10A is provided with a main breaker 52, branch breakers 53A and 53B, and a transmitter 6. As shown in FIG. In FIG. 4, among the constituent elements of the distribution board 10A, a structure for controlling lighting is shown as the equipment 3 to be controlled. The distribution boards 10B and 10C have the same configuration as the distribution board 10A.

The master breaker 52 is a breaker that supplies power to the branch breakers 53A and 53B. Also, the main breaker 52 monitors the current value, and cuts off the power supply when the current value exceeds a predetermined value. The main breaker 52 is a single-phase three-wire breaker, and has an L1-phase terminal connected to the power line W20A, an L2-phase terminal connected to the power line W20B, and a ground-side N-phase terminal connected to the power line W20C. be. The branch breaker 53A is connected to the L1-phase power line W20A and the N-phase power line W20C. The branch breaker 53B is connected to the L2-phase power line W20B and the N-phase power line W20C. The branch breaker 53A supplies power to each receiving unit 4 and the controlled equipment 3 connected to the power line W8A in the hierarchy F1 (see FIG. 3). The branch breaker 53B supplies power to each receiving unit 4 and the controlled equipment 3 connected to the power line W8B in the hierarchy F1 (see FIG. 3). Thereby, the master breaker 52 supplies electric power with respect to the receiving part 4 and the control object equipment 3 via three power lines W20A, W20B, and W20C.

On the other hand, the transmission unit 6 is provided in the main breaker 52 by being connected to the power lines W20B and W20C associated with the combination (first combination) of “L2 phase-N phase” in the main breaker 52 . Specifically, the transmitting unit main body 25 of the transmitting unit 6 is connected to the L2-phase power line W20B through the wire W30, and is connected to the N-phase power line W20C through the wire W31. As a result, the signal from the transmitter 6 passes through the power lines W20B and W20C associated with the combination of "L2 phase-N phase".

Here, the configuration and function of the promotion section 33 provided in the cubicle 20 shown in FIG. 3 will be described. The facilitating portion 33 is, for example, a ferrite core or a filter. The promoting portion 33 according to this embodiment has two ferrite cores. The promotion unit 33 is provided directly below the transformer 31 of the power line W6. The promotion unit 33 is provided directly under the transformer 31, which means that it is provided on the power line between the transformer 31 and the transmission unit 6, and the impedance of the power line connecting the transformer 31 and the promotion unit 33 is increased by a predetermined value or more. does not exist. The predetermined value is, for example, 0.01Ω. The predetermined value may be 0.01Ω or more and 0.1Ω or less. The predetermined value is not limited to the impedance values described above. The fact that the facilitating section 33 is provided directly under the transformer 31 may mean, for example, that there is no configuration that electrically intervenes in the power line that connects the transformer 31 and the facilitating section 33 .

The promoting unit 33 is provided outside the distribution boards 10A, 10B, and 10C, and is provided in the electric line (either the power line W6 or the power line W7) between the transformer 31 and the distribution boards 10A, 10B, and 10C. be done. For example, the promotion unit 33 is provided between the transformer 31 and the breaker 32 on the power line W6. Specifically, the promotion unit 33 may be arranged inside the housing of the cubicle 20 and connected to the wiring structure (power line W6) inside the housing of the cubicle 20 . Alternatively, the promotion part 33 may be arranged outside the housing of the cubicle 20 and connected to the wiring structure (power line W6) inside the housing of the cubicle 20 . In this case, the promotion part 33 is attached to the outside of the door surface or the side surface of the cubicle 20, the wiring is inserted from the hole formed in the housing of the cubicle 20, and the wiring structure inside the housing of the cubicle 20 (power line W6). Further, the promotion unit 33 may not be attached to the outer surface of the housing of the cubicle 20, and may be connected to the wiring structure (power line W6) inside the housing of the cubicle 20. FIG.

FIG. 5 is a schematic configuration diagram showing the configuration of a cubicle according to one embodiment. As shown in FIG. 5, the transformer 31 of the cubicle 20 is of a single-phase three-wire type, and the power line W60A is connected to the terminal of the L1 phase, the power line W60B is connected to the terminal of the L2 phase, and the N phase on the ground side is connected. is connected to the power line W60C. Each breaker 32 is connected to an L1-phase power line W60A and an N-phase power line W60C. Each breaker 32 is connected to each power line W60A, W60B, W60C. Thereby, each breaker 32 supplies power to the distribution boards 10A, 10B, and 10C via the three power lines W60A, W60B, and W60C.

The promoting unit 33 is provided according to the power line (phase) to which the receiving unit 4 to promote the flow of the signal from the transmitting unit 6 is connected. For example, when the purpose is to promote the flow of a signal from the transmitting unit 6 to the receiving unit 4 provided in each power line extending from the L2 phase and the N phase, the promoting unit 33 It is provided on the power lines W60B and W60C related to the combination of “L2 phase-N phase” (fourth combination), and is provided immediately below the transformer 31. FIG. In this case, the transmission unit 6 is provided, for example, on power lines W20B and W20C extending from the L2 phase and the N phase (see FIG. 4). One of the ferrite cores of the promoting portion 33 is provided along the extending direction of the L2-phase power line W60B. The other ferrite core of promoting portion 33 is provided along the extending direction of N-phase power line W60C. These ferrite cores are provided, for example, so as to surround the power lines W60B and W60C on the radially outer sides of the power lines W60B and W60C.

The facilitator 33 facilitates signal flow from the transmitter 6 to the receiver 4 (see FIG. 3). That is, the promoting section 33 promotes the flow of the signal to the opposite side (downstream side) of the transformer 31 . The promoting unit 33 suppresses not only high-frequency noise but also signals of frequencies for communication among the narrowband signals from flowing to the transformer 31 side (upstream side).

In order to promote the above-described signal flow, the promotion unit 33 adjusts the impedances of the power lines W6 and W7 so that they are higher than the impedance of the power line W8. The facilitating section 33 of the present embodiment adjusts the impedance of the power line W6 between the transformer 31 and the facilitating section 33 to be higher than the impedance of the power line W8 between the transmitting section 6 and the receiving section 4 . The difference between the impedance value of the power line W6 and the impedance value of the power line W8 may be, for example, 0.01Ω, or may be 0.01Ω or more and 0.1Ω or less. The difference in impedance values is not limited to the values described above. As a result, it is possible to increase the impedance in the circuit including the power line W6 to which the promotion unit 33 is connected by at least one of the fourth combination, the fifth combination, and the sixth combination. can. Since the impedance of the power line W6 is higher than the impedance of the power line W8, the signal output from the transmission unit 6 can be suppressed from flowing upstream of the transmission unit 6. In other words, it is possible to promote the flow of the signal that was going to the upstream side to the downstream side of the transmitter 6 . Here, the upstream side refers to the side of the power line W5 closer to the power source 7 when viewed from the power line W8 connected to the controlled equipment 3 to which power is supplied.

Next, functions and effects of the power line communication system 100 according to this embodiment will be described.

In the power line communication system 100 according to this embodiment, the transformer 31 and the transmitter 6 are electrically connected, and the transmitter 6 and the receiver 4 are electrically connected. Since the promotion unit 33 is provided directly under the transformer 31, the signal flow on the power line W6 (an example of the first electric line) upstream from the transmission unit 6 can be promoted from the transmission unit 6 to the reception unit 4 on the power line W8. can be done. Here, in the conventional power line communication system, the signal does not sufficiently flow downstream (receiving part side) from the transmitting part, and part or all of the signal flows upstream (power supply side), so that the receiving part is not necessary and sufficient. There was a risk that information could not be obtained and part or all of the information that should be obtained would be lost. In the power line communication system 100 of the present embodiment, the signal flow can be promoted between the transmitter and the receiver connected to the power line to which the promoting section 33 is connected immediately below the transformer 31 . Thereby, the receiver 4 can appropriately acquire the signal from the transmitter 6 . Therefore, this power line communication system 100 can ensure appropriate communication quality. In addition, since the promotion unit 33 is provided directly under the transformer 31, there is no need to provide a promotion unit outside each of the distribution boards 10A, 10B, and 10C. can promote

In the power line communication system 100, the receiving unit 4 is electrically connected to the transmitting unit 6 by the power line W8 (an example of the second electrical circuit), and the promoting unit 33 adjusts the impedance of the power line W6 so that the impedance of the power line W8 is higher than that of the power line W8. are doing. In this case, the impedance of the power line W6 becomes higher than the impedance of the power line W8 due to the adjustment of the promotion unit 33, so that the signal from the transmission unit 6 flows more easily through the power line W8 than through the power line W6. That is, it is possible to suppress the flow of signals from the transmission unit 6 toward the upstream power lines W6 and W7. Therefore, the promoting unit 33 can promote the flow of signals from the transmitting unit 6 to the receiving unit 4, and can ensure appropriate communication quality.

The power line communication system 100 further includes distribution boards 10A, 10B, and 10C that accommodate the main breaker 52 provided on the power line W7 between the transformer 31 and the transmission unit 6. , 10C and is provided on the power line W6 or power line W7 between the transformer 31 and the distribution boards 10A, 10B, 10C. In this case, the promoting unit 33 is installed directly below the transformer 31 outside the distribution boards 10A, 10B, and 10C. When each of the distribution boards 10A, 10B, and 10C is provided with a promoting unit, it takes time and effort to adjust each distribution board according to the impedance after the impedance on the transformer side is determined. For example, by installing a promotion unit inside the distribution board, it is possible to suppress the flow of signals outside the distribution board, but because it is necessary to provide a promotion unit for each distribution board, man-hours are required for installation and maintenance. It takes Here, in narrowband power line communication, unlike broadband power line communication (power line communication in the frequency band of 2 MHz or more and 30 MHz or less), adjustment is made so that the signal does not leak from the transmission part to the outside of the distribution board due to the regulations of the Radio Law. No need. That is, in the narrowband power line communication, there is no restriction on the position where the promotion unit is installed. Therefore, in the power line communication system 100, there is no need to provide promotion units for each of the distribution boards 10A, 10B, and 10C. . As described above, when the promotion unit 33 is provided outside the distribution boards 10A, 10B, and 10C, when the impedance of the power line W6 (or power line W7), which is part of the circuit upstream of the transmission unit 6, is found, can be installed and adjusted with Note that when the impedance of the power line W6 is adjusted to be greater than the impedance of the power line W8, the flow of signals downstream from the transmission unit 6 can be promoted, and the signals are transmitted to the outside upstream of the distribution boards 10A, 10B, and 10C. flow can be suppressed. Therefore, the power line communication system 100 can easily install and maintain the promotion unit 33 according to the type, connection status, and number of facilities downstream of the transformer 31 . This power line communication system 100 reduces the man-hours for installing promotion units in each of the distribution boards 10A, 10B, and 10C and the man-hours for maintenance, and collectively promotes the flow of signals to each of the distribution boards 10A, 10B, and 10C. can do.

In the power line communication system 100, the frequency of the signal is between 10 kHz and 450 kHz.

In the power line communication system 100, the promotion unit 33 is provided in at least one phase of the power line W6 divided into three phases. In the present embodiment, the promoting section 33 can exhibit the effect of promoting signal flow in at least the receiving section 4 and the transmitting section 6 connected to the L2 phase and the N phase. Depending on the phase of the power line to which the receiving unit 4 and the transmitting unit 6 are connected, the place where the promoting unit 33 is provided can be changed or added. Therefore, the power line communication system 100 can minimize the number of the promotion units 33 to be installed, and facilitate installation and maintenance of the promotion units 33 . Further, compared to the case where a ferrite core is provided for one phase, when a ferrite core is provided for two phases as in the present embodiment, the power line communication system 100 has a reception connected to the two phases. It is possible to promote the flow of signals to the unit 4 and the transmitting unit 6 more strongly.

In the cubicle 20, the transformer 31 and the power line communication system 100 having the receiving section 4 and the transmitting section 6 are electrically connected by the power lines W6 and W7. Since the promotion section 33 is provided directly below the transformer 31 , it is possible to promote the flow of signals from the transmission section 6 to the reception section 4 in the cubicle 20 upstream of the transmission section 6 . Thereby, the receiver 4 can appropriately acquire the signal from the transmitter 6 . Therefore, this cubicle 20 can ensure appropriate communication quality. In addition, it is not necessary to provide a promotion section for each of the distribution boards 10A, 10B, and 10C connected to the cubicle 20. FIG. The facilitating section 33 provided in the cubicle 20 can collectively promote the flow of signals in the electric line (power line W8) downstream of the cubicle 20 .

The cubicle 20 is electrically connected to the transformer 31 by the power line W6, and has a plurality of breakers 32 provided between the transformer 31 and the transmitter 6. be provided. In this case, when installing and maintaining the facilitating units downstream of each breaker, the man-hours for installing the facilitating units and the man-hours for maintenance increase or decrease according to the number of breakers. On the other hand, in the present embodiment, since the promoting section 33 is installed between the transformer 31 and the plurality of breakers 32 and upstream before branching to the plurality of breakers 32, when it is installed downstream of each breaker The number of man-hours for installing the promotion unit 33 and the number of man-hours for maintenance can be reduced.

The invention is not limited to the embodiments described above.

For example, the arrangement, position, and number of the equipment to be controlled 3, the receiving unit 4, the transmitting unit 6, the promoting unit 33, and the load equipment on each floor shown in FIG. 3 are not particularly limited, and may be changed as appropriate.

For example, the combination of power lines to which the transmitter 6 is connected is not limited. Transmission unit 6 may be provided in main breaker 52 by being connected to power lines W20A and W20C associated with the combination of “L1 phase-N phase” in main breaker 52 (second combination). As a result, the signal from the transmitter 6 passes through the power lines W20A and W20C associated with the combination of "L1 phase-N phase". The transmission unit 6 may be provided in the main breaker 52 by being connected to the power lines W20A and W20B associated with the combination of “L1 phase-L2 phase” in the main breaker 52 (third combination). As a result, the signal from the transmitter 6 passes through the power lines W20A and W20B associated with the combination of "L1 phase-L2 phase".

Also, the number of transmitting unit main bodies 25 of transmitting unit 6 is not limited. A plurality of transmission unit main bodies 25 may be provided in the distribution board 10A and connected to power lines according to a plurality of combinations among the first combination, the second combination, and the third combination described above. Thereby, the signal output from the transmitter 6 can be transmitted to the receiver 4 connected to each power line.

Also, the combination of power lines to which the promotion unit 33 is connected is not limited. For example, when the purpose is to promote the flow of a signal from the transmitting unit 6 to the receiving unit 4 provided in each power line extending from the L1 phase and the N phase, the promoting unit 33 is provided in the transformer 31 It may be provided on the power lines W60A and W60C associated with the combination of “L1 phase-N phase” (fifth combination) and directly below the transformer 31 . In this case, the transmitter 6 is provided on each power line extending from the L1 phase and the N phase, for example. One of the ferrite cores of the promoting portion 33 is provided along the extending direction of the L1-phase power line W60A. The other ferrite core of promoting portion 33 is provided along the extending direction of N-phase power line W60C.

For example, when the purpose is to promote the flow of a signal from the transmitting unit 6 to the receiving unit 4 provided in each power line extending from the L1 phase and the L2 phase, the promoting unit 33 It may be provided on the power lines W60A and W60B related to the combination of “L1 phase-L2 phase” (sixth combination) and directly below the transformer 31 . In this case, the transmitter 6 is provided on each power line extending from the L1 phase and the L2 phase, for example. One of the ferrite cores of the promoting portion 33 is provided along the extending direction of the L1-phase power line W60A. The other ferrite core of promoting portion 33 is provided along the extending direction of L2-phase power line W60B.

Also, the number of ferrite cores in the promoting portion 33 is not limited. The number of ferrite cores in the promotion section 33 may be set according to the number of power lines extending from each phase of the transformer 31 . For example, one (a total of three) ferrite cores may be provided in the cubicle 20 for each of the three phases of the L1 phase, the L2 phase and the N phase. This makes it possible to deal with any of the above-described fourth combination, fifth combination, and sixth combination. That is, the promotion unit 33 includes a ferrite core provided along the extending direction of the L1-phase power line W60A, a ferrite core provided along the extending direction of the L2-phase power line W60B, and an extension of the N-phase power line W60C. and a ferrite core provided along the existing direction. In this case, it is possible to collectively promote the flow of signals to the receiving section 4 and transmitting section 6 connected to any one of the L1 phase, L2 phase and N phase.

For example, one ferrite core may be provided in the cubicle 20 for three phases of L1 phase, L2 phase and N phase. In this case, the ferrite core of the promoting unit 33 is connected to one of the two power lines (two-phase) to which the target receiving unit 4 for promoting the flow of the signal from the transmitting unit 6 is connected (one-phase). provided for This form is applied, for example, when the phase to which the receiving section 4 and the transmitting section 6 are connected is already decided. In this case, compared to the case where ferrite cores are provided for a plurality of phases, the promoting portion 33 can be easily provided, and the signal flow can be easily promoted.

FIG. 6 is a schematic configuration diagram showing the configuration of a cubicle according to a modification. As shown in FIG. 6, the cubicle 20 may be provided with a terminal block 34 . The L1-phase power line W60A of the transformer 31 is connected to the terminal 35A of the terminal block 34, the L2-phase power line W60B is connected to the terminal 35B of the terminal block 34, and the ground-side N-phase power line W60C is connected to the terminal block 34. is connected to the terminal 35C of the The breakers 32 for the respective layers F1, F2, and F3 are connected to the L1-phase terminal 35A, the L2-phase terminal 35B, and the N-phase terminal 35C, respectively. Thereby, the transformer 31 supplies electric power to the controlled equipment 3 and the receiving unit 4 on each of the hierarchies F1, F2, and F3 via the three power lines W60A, W60B, and W60C. The object of connection of the promotion unit 33A to each of the power lines W60A, W60B, and W60C has the same meaning as that shown in FIG. The facilitating portion 33A is provided between the transformer 31 and the terminal block 34, for example. In this case, the number of target power lines on which the facilitating portion 33A can be installed can be reduced compared to the case where the facilitating portion is arranged downstream of the terminal block or downstream of the plurality of breakers. man-hours can be reduced. Note that the facilitating portion 33A may be provided between the terminal block 34 and the plurality of breakers 32, for example. In this case, the number of target power lines on which the facilitator 33A can be installed can be reduced compared to the case where the facilitator is arranged downstream of a plurality of breakers, thereby reducing the man-hours for installation and maintenance. be able to.

The transmitter 6 may be provided in the cubicle 20 . In this case, the promotion section 33 is provided between the transformer 31 and the transmission section 6 .

FIG. 7 is a schematic configuration diagram showing a power line communication system according to a modification. As shown in FIG. 7, the power line communication system 100A may not have cubicles. The power line communication system 100A is electrically connected to a voltage changing transformer 31A by power lines W6 and W7, and is electrically connected to a transmitter 6A that transmits a signal in narrowband power line communication and to the transmitter 6A by a power line W8. and a facilitating unit 33A provided immediately below the transformer 31A of the power line W6 and promoting the flow of the signal from the transmitting unit 6A to the receiving unit 4A. The receiving unit 4A is a slave unit provided for the controlled equipment 3A (lighting in FIG. 7). The transformer 31A is electrically connected to the power supply 7 via the power line W5. The transmitter 6 is provided in the distribution board 10D electrically connected to the transformer 31A. Acceleration unit 33A is provided between transformer 31A and distribution board 10D. That is, the promotion unit 33A is provided upstream of the distribution board 10D directly below the transformer 31A. In this modified example, only the reference numerals are different, and devices and configurations having the same names as those of the above-described embodiment exhibit the same actions and effects.

A building BD2 to which the power line communication system 100A shown in FIG. 7 is applied may be, for example, a facility such as a detached house. If the building BD2 in which the receiving unit 4 and the transmitting unit 6 are installed is a detached house or the like, for example, the transformer 31A is not installed in the cubicle. The transformer 31A is installed, for example, on a utility pole outside the building BD2. Transformer 31A is electrically connected to distribution board 10D in building BD1 via power line W7. Even the power line communication system 100</b>A having such a configuration can exhibit the same action and the same effect as the power line communication system 100 .

The signal strength of the receiving section was detected by providing the promoting section directly below the transformer, and the function and effect of the promoting section were verified.

[Comparative Example 1]
(a) of FIG. 8 is a circuit diagram of a power line communication system according to a comparative example before installation of a transformer and a promotion section. As shown in (a) of FIG. 8, a power line communication system 100P according to Comparative Example 1 includes a controlled facility 3P, a receiver 4P, and a transmitter 6P. The equipment to be controlled 3P, the receiver 4P, and the transmitter 6P are electrically connected in parallel. Each configuration is operated by a power supply (not shown). The transmitting unit 6P continuously outputs power line communication signals (PLC signals) of 100 kHz to 400 kHz toward the controlled equipment 3P and the receiving unit 4P. The controlled equipment 3P is an example of a load. The receiver 4P is, for example, a spectrum analyzer. The receiving section 4P has a resistance value of 50Ω and is connected to the terminal end of the circuit. The receiver 4P detects the signal from the transmitter 6P.

FIG. 8(b) is a graph of experimental results showing the signal spectrum in the receiving section before installation of the transformer and the enhancement section. As shown in (b) of FIG. 8, a signal of about -20 dBm was detected in the frequency range of 100 kHz to 400 kHz in the receiver 4P. Also, it was shown that the signal is detected with substantially constant intensity in the receiver 4P in the frequency range of 100 kHz or more and 400 kHz or less, which is the frequency band of the signal output from the transmitter 6P. Furthermore, signals of about -70 dBm were detected in other frequency bands not output from the transmitter 6P, such as 50 kHz or more and less than 100 kHz and more than 400 kHz and 1000 kHz or less.

[Comparative Example 2]
(a) of FIG. 9 is a circuit diagram after installation of a transformer and before installation of a promotion unit in a power line communication system according to a comparative example. As shown in (a) of FIG. 9 , a power line communication system 100Q according to Comparative Example 2 includes a controlled facility 3Q, a receiver 4Q, and a transmitter 6Q. The power line communication system 100Q further includes a transformer 31Q. The equipment to be controlled 3Q, the receiver 4Q, the transmitter 6Q, and the transformer 31Q are electrically connected in parallel. The transmitter 6Q is provided between the transformer 31Q, the controlled equipment 3Q, and the receiver 4Q. The controlled equipment 3Q, the receiver 4Q, and the transmitter 6Q are operated by power supplied via the transformer 31Q. The transformer 31Q receives power supply from a power supply (not shown). The transmitter 6Q continuously outputs power line communication signals of 100 kHz to 400 kHz toward the controlled equipment 3Q and the receiver 4Q. The controlled equipment 3Q is an example of a load. The receiver 4Q is, for example, a spectrum analyzer. The receiving section 4Q has a resistance value of 50Ω and is connected to the terminal of the circuit. The receiver 4Q detects the signal from the transmitter 6Q. The transformer 31Q has the same function as the transformer 31 in the above-described embodiment.

FIG. 9(b) is a graph of experimental results showing the signal spectrum in the receiving section after installation of the transformer and before installation of the enhancement section. As shown in (b) of FIG. 9, a signal in the range of -80 dBm to -55 dBm was detected in the receiver 4Q in the frequency range of 100 kHz to 400 kHz. In addition, it was confirmed that the higher the frequency, the higher the detection intensity in the range of 100 kHz to 400 kHz. Furthermore, signals of about -90 dBm were detected in other frequency bands not output from the transmitter 6Q, such as 50 kHz or more and less than 100 kHz and more than 400 kHz and 1000 kHz or less.

[Example]
(a) of FIG. 10 is a circuit diagram after installation of the transformer and the acceleration unit in the power line communication system according to the embodiment. As shown in (a) of FIG. 10, the power line communication system 100R according to the embodiment includes a controlled facility 3R, a receiver 4R, a transmitter 6R, and a promoter 33R. The power line communication system 100R further includes a transformer 31R. The controlled equipment 3R, the receiver 4R, the transmitter 6R, and the transformer 31R are electrically connected in parallel. The transmitter 6R is provided between the transformer 31R, the controlled equipment 3R, and the receiver 4R. The equipment 3R to be controlled, the receiver 4R, and the transmitter 6R are operated by electric power supplied via the transformer 31R. The transformer 31R receives power supply from a power supply (not shown). The transmitter 6R continuously outputs power line communication signals of 100 kHz to 400 kHz toward the controlled equipment 3R and the receiver 4R. The controlled equipment 3R is an example of a load. The receiver 4R is, for example, a spectrum analyzer. The receiving section 4R has a resistance value of 50Ω and is connected to the terminal of the circuit. The receiver 4R detects the signal from the transmitter 6R. The transformer 31R has the same function as the transformer 31 in the above-described embodiment. The promotion unit 33R is provided in each of the two power lines connected to the transmission unit 6R. The promoting portion 33R is, for example, a ferrite core.

FIG. 10(b) is a graph of experimental results showing the signal spectrum at the receiving section after installation of the transformer and the enhancement section. As shown in FIG. 10(b), a signal in the range of about -20 dBm was detected in the receiver 4R in the frequency range of 100 kHz to 400 kHz. Also, it was shown that the signal is detected with substantially constant intensity in the receiver 4P in the frequency range of 100 kHz or more and 400 kHz or less, which is the frequency band of the signal output from the transmitter 6P. Furthermore, signals of about -70 dBm were detected in other frequency bands not output from the transmitter 6R, such as 50 kHz or more and less than 100 kHz and more than 400 kHz and 1000 kHz or less.

By comparing the results of Comparative Example 1 and the results of the example, even if the transformer 31R is connected to the power line communication system 100P, the signal strengths detected by the receivers 4P and 4R are substantially the same regardless of the frequency band. It became clear that On the other hand, by comparing the results of Comparative Example 1 and Comparative Example 2, when the transformer 31Q is connected to the power line communication system 100P, the signal strength detected by the receivers 4P and 4Q is small in each frequency band. Become. In addition, in the range of 100 kHz or more and 400 kHz or less, which is the frequency band of the signals output from the transmitters 6P, 6Q, and 6R, the signal strength detected by the receivers 4P and 4R in Comparative Example 1 and Example is independent of the frequency. While constant, in the range of the frequency band, in Comparative Example 2, the signal strength detected by the receiving section 4Q differs for each frequency. From these results, even if a transformer is connected to the circuit of the equipment to be controlled, the receiving unit, and the transmitting unit, the signal from the transmitting unit can be appropriately detected in the receiving unit by providing the promoting unit. It became clear that

When the transformer 31Q is directly connected to the transmitter 6Q as shown in FIG. 9A, the signal output from the transmitter 6Q is transmitted not only to the receiver 4Q side (downstream side) but also to the transformer 31Q side (upstream side). side), the signal strength detected by the receiving unit 4Q according to the comparative example 2 is presumed to have decreased. On the other hand, when the transformer 31R is connected to the transmission unit 6R via the promotion unit 33R as shown in FIG. 10(a), the signal output from the transmission unit 6R flows to the transformer 31R side (upstream side). is suppressed, and the flow to the receiving unit 4Q side (downstream side) is promoted, so it is presumed that the same signal strength as the signal strength detected by the receiving unit 4P according to the embodiment is detected by the receiving unit 4R. . Therefore, by providing the promoting section between the transformer and the transmitting section, the power line communication system can ensure appropriate communication quality between the transmitting section and the receiving section.

3, 3P, 3Q, 3R... equipment to be controlled, 4, 4A, 4P, 4Q, 4R... receiving section, 6, 6A, 6P, 6Q, 6R... transmitting section, 7... power supply, 10A, 10B, 10C, 10D... Distribution board (distribution equipment) 20 Cubicle (distribution equipment) 31, 31A, 31Q, 31R Transformer (power supply unit) 32 Breaker 33 Acceleration unit 50 Distribution equipment 51 Power supply unit , 52... master breaker, 100... power line communication system.

Claims (7)

a transmitter that is electrically connected to the transformer that changes the voltage and the first electric line and that transmits a signal in narrowband power line communication;
a receiver that is electrically connected to the transmitter and receives the signal;
an facilitating section provided directly under the transformer of the first electrical circuit and facilitating the flow of the signal from the transmitting section to the receiving section;
A power line communication system comprising: The receiving unit is electrically connected to the transmitting unit by a second electric line,
2. The power line communication system according to claim 1, wherein said facilitating unit adjusts the impedance of said first electric line to be higher than the impedance of said second electric line. further comprising a distribution board accommodating a main breaker provided in the first electric line between the transformer and the transmission unit;
3. The power line communication system according to claim 1, wherein said promotion unit is provided outside said distribution board and in said first electric line between said transformer and said distribution board. The power line communication system according to any one of claims 1 to 3, wherein the signal has a frequency of 10 kHz or more and 450 kHz or less. The power line communication system according to any one of claims 1 to 4, wherein said promoting section is provided in at least one phase electric circuit among said first electric circuit divided into three phases. A cubicle connected to a power line communication system comprising a transmitting unit that transmits a signal in narrowband power line communication and a receiving unit that receives the signal,
a transformer electrically connected to the power line communication system by a first electric line and changing a voltage;
an facilitating section provided immediately below the transformer for facilitating the flow of the signal to the side opposite to the transformer;
A cubicle. The cubicle is electrically connected to the transformer and the first electric line, and has a plurality of breakers provided between the transformer and the transmitter,
7. The cubicle according to claim 6, wherein said facilitator is provided between said transformer and said breaker.

Images