JP2002223183A - Power line bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power line bridge with high reliability that can remarkably reduce disabled communication or deteriorated communication between different phases. SOLUTION: In the case that power-line carrier communication equipment S1 transmits data to power-line carrier communication equipment S2 by a broadcast system, the data pass through the isolator section 12 of the power-line bridge 10, only the signal component is fed to a filter 14, which passes the signal component of the carrier frequency band and eliminates the noise component. A transmission reception section in a CPU 16 reads its own address and an opposite party address of a header part of the received signal and collates them with addresses in an address memory. When the collation indicates communication between same phases, the passing of the signal component is rejected. Furthermore, in the case that the power-line carrier communication equipment S1 transmits data to power-line carrier communication equipment S3, the CPU 16 reads its own address and an opposite party address of the header part of the received signal component and collates them with addresses of the address memory. When the collation discriminates communication between different phases, the passing of the signal component is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line bridge device, and more particularly, to a power line bridge device which uses a single-phase three-line power line, is provided between different phases, and enables communication between different phases. About.

[0002]

2. Description of the Related Art Conventionally, power line communication for performing data communication and the like has been performed by using a power line wired in a general home, office, factory, or the like as a communication line. The advantage of this power line communication is that if the phases of the power lines are the same, data communication can be easily performed simply by plugging in any AC outlet in a building or facility. This eliminates the need for dedicated wiring for communication and communication, and enables communication even in places where communication is not possible by radio (specific low power or the like), which is obstructed by shields such as walls.
Therefore, in a building or the like, a single-phase three-wire power line 30 as shown in FIG. 5 is often used, and the power distribution panel 32 is divided into power receiving panels A1 and A2 of different phases.
As described above, when the communication device is connected to the power lines divided into different phases, the power lines can be used as communication lines between the same phases, but communication between the different phases cannot be performed. Therefore, the conventional power line bridge device 34 as shown in FIG.
By providing them between them, communication can be performed even between communication devices connected to power lines of different phases (for example, between S1 and S3). The power line bridge device of FIG. 6 includes power line carrier communication devices S1, S2, S2 on power lines W1, W2 extending from power receiving boards A1, A2 of different phases, respectively.
3 are connected. A power line bridge device 34 is connected between the power lines W1 and W2. The power line bridge device 34 insulates between the two power lines W1 and W2, but adjusts the separation parts 36 and 40 formed of a capacitor and a coil through which a signal component passes, and a difference in carrier frequency between different phases. The protection circuit 38 includes a protection circuit 38 and the like.

[0003]

However, in such a conventional power line bridge device, the power line W
1, W2 connected to power line carrier communication devices S1, S2
If the number of S3s increases and communication data is transmitted by the broadcast method, the probability of collision of data transmitted at the same time increases, and communication becomes impossible due to garbled characters or significant communication. There is a problem that the ability is reduced. The present invention has been made in view of the above-described problems, and the number of communication devices connected to a power line has been increased, so that even when data transmission is performed by a broadcast method, communication failure between different phases and reduction in communication capability are significantly reduced. It is an object of the present invention to provide a highly reliable power line bridge device capable of reducing power consumption.

[0004]

According to a first aspect of the present invention, a power line composed of three single-phase wires is provided between different phases to enable communication between different phases. In the power line bridge device, the power lines between the different phases are insulated from each other, and a separating means for passing a high-frequency signal component, a filter for selectively passing a signal component in a specific band, and a filter connected to each phase. And distributing means for grasping the communication device and passing only the signal component in the inter-phase communication. According to this, the power lines between different phases are insulated from each other by the separating means, high-frequency signal components are passed, signal components of a specific band are selectively passed by the filter, and connected to each phase by the distribution means. Communication devices connected to the power line, the number of communication devices connected to the power line increases, and even if data is transmitted by the broadcast method, unnecessary signals are used between different phases. Since transmission is not performed, it is possible to significantly reduce communication impairment and a reduction in communication capability, thereby improving reliability. According to a second aspect of the present invention, in the power line bridge device according to the first aspect, the distribution unit includes a receiving unit that receives a signal component transmitted from any one of the phases via the filter, An address memory storing an address of a communication device connected to the phase, and an address included in the signal component received by the receiving unit and an address stored in the address memory are compared with each other. A distribution control unit that permits passage if the signal component and rejects passage if it is a signal component in the in-phase communication, and a transmission unit that transmits the signal component permitted to pass by the distribution control unit to another phase And characterized in that: According to this, the distribution unit receives the signal component in the receiving unit, and includes an address memory in which the address of the communication device connected to each phase is stored, and the address of the signal component received in the distribution control unit. And the address of the address memory are compared, the signal component in the interphase communication is allowed to pass, the transmission unit transmits to the other phase, and the signal component of the inphase communication is refused to pass. Even when the number of connected communication devices increases and data transmission is performed by the broadcast method, unnecessary signal transmission between different phases is not performed, and communication inability and reduction in communication capability are greatly reduced, and reliability is reduced. Can be improved.

According to a third aspect of the present invention, in the power line bridge device according to the second aspect, the distribution control unit stores an address contained in a signal component received by the receiving unit in the address memory. If there is no new address, an address is added to the address memory by ascertaining which phase the communication device is connected to. According to this, if the address received by the receiving unit is not stored in the address memory, the distribution control unit determines which phase the communication device is connected to and adds the address to the address memory. Even if a communication device is added later, once communication is performed, processing is performed based on the registered address for the second and subsequent times even if a communication device is added later. Accordingly, it is possible to prevent a communication failure or a decrease in communication capability beforehand, and to improve reliability. According to a fourth aspect of the present invention, in the power line bridge device according to the second aspect, the distribution control unit stores an address included in a signal component received by the receiving unit in the address memory. When the phase connected to the communication device is changed, the address memory is rewritten using the previous address as the address of the communication device connected to the new phase. According to this, even if the address received by the receiving unit is stored in the address memory, the distribution control unit
If there is a change in the connected phase of the communication device, the address memory is rewritten with the previous address as the address of the communication device connected to the new phase, so even if the communication device is changed or moved between different phases In this case, it is possible to quickly respond to the problem and prevent communication failure or reduction in communication capability, thereby improving reliability.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings. In the present embodiment, an example will be described in which the power line bridge device of the present invention is provided between power lines having different single-phase and three-phase phases in a building and power line communication is performed. FIG. 1 is a schematic configuration diagram of a power line communication system to which a power line bridge device according to the present embodiment is connected. In this case, as shown in FIG.
Power lines W1 and W2 having different phases are laid from each of the power receiving panels A1 and A2 in FIG. 1. Various electric products (not shown) are connected to the power lines W1 and W2 via outlets, and power line carrier communication devices S1, S2 and S3 as shown in FIG. 1 are connected. Here, a state in which three power line carrier communication devices are connected is shown as an example, but it is assumed that more power line carrier communication devices are actually connected. The power line bridge device 10 of the present invention is connected between the power lines W1 and W2. As shown in FIG. 1, the power line bridge device 10
The two power lines W1 and W2 are insulated from each other, but high-frequency signal components are passed therethrough. Separation units 12 and 20 each composed of a capacitor and a coil as pass-through means. The filters 14 and 18 to be removed, and the power line communication devices S1, S2 and S3 connected to the power lines W1 and W2 of each phase are grasped, and only the signal components of the interphase communication are passed. It is composed of a CPU 16 and the like as a dividing means.

FIG. 2 is a block diagram showing an example of the configuration of the CPU 16 of FIG. In FIG. 2, the CPU 16 receives a signal component transmitted from any phase via the filters 14 and 18 or transmits a signal component permitted to pass by the distribution control unit 162 described later to another phase. Transmission / reception units 160 and 164, an address memory 166 for storing the phases and addresses of the respective communication devices connected to the power lines W1 and W2 of each phase in association with each other, and a signal component received by the reception unit. Address and address memory 1 included
The distribution control unit 162 and the like that collates with the address stored in 66 so as to permit passage if the signal component is in interphase communication and reject passage if the signal component is in inphase communication. It is configured. FIG.
FIG. 2 is a diagram illustrating a format structure of data transmitted and received in the power line communication system of FIG. 1. The data format shown in FIG. 3 includes a header section 22 and a data section 24. In the header section 22, the own address 22a of the power line carrier communication device (S1, S2, S3,...) For further transmitting data is included. And the destination address 22b of the transmission destination.

Next, the operation of this embodiment will be described. First, it is assumed that data is transmitted from the power line communication device S1 to S2 by a broadcast method.
In that case, the communication between the power line carrier communication devices S1 → S2
In-phase communication in the power line W1, in which only the signal component is sent to the filter 14 through the separation unit 12 of the power line bridge device 10, and only the signal component in the carrier frequency band is passed, while the other noise components Etc. are removed. FIG.
In the CPU 16, the own address 22 a and the other party address 22 b of the header section 22 shown in FIG. 3 are read and received by the transmitting / receiving section 160, and are compared with the addresses stored in the address memory 166. Own address 22a is (S1), partner address 22b is (S2)
Therefore, the signal is determined to be a signal component in the in-phase communication, and the distribution control unit 162 rejects passage. For this reason,
Even if the broadcast method is adopted, the transmission data is transmitted to the power line carrier communication device S1 → S2 without passing through the power line bridge device 10 as the in-phase communication. Further, when data is transmitted from the power line carrier communication devices S1 to S3 by a broadcast method, the power lines W1 and W2 are interphase communication. In this case, only the signal component is sent to the filter 14 through the separation unit 12 of the power line bridge device 10 to pass only the signal component in the carrier frequency band, and the above noise components are removed until other noise components are removed. Is the same as Then, in the CPU 16 of FIG. 2, the own address 22 a and the partner address 22 b of the header section 22 shown in FIG. 3 which are received by the transmitting / receiving section 160 are read, and are compared with the addresses stored in the address memory 166. Here, since the own address 22a is (S1) and the other party address 22b is (S3), it is determined as a signal component in inter-phase communication, and the distribution control unit 162 permits the passage. Thereafter, the order is the reverse of the above, and is transmitted to the power line carrier communication device S3 via the transmission / reception unit 164, the filter 18, and the separation unit 20 via the power line W2. FIG. 4 is a schematic diagram showing the states of the above-described in-phase communication and out-of-phase communication.

As described above, according to the present embodiment, the address of the transmission data is checked one by one, and the passage through the power line bridge device 10 is permitted only in the case of inter-phase communication, so that the power line connected to the power line is connected. Even if the number of carrier communication devices increases and data is transmitted by the broadcast method, half of the conventional transmission will be rejected with probability. Can be greatly reduced. Further, in the present embodiment, the transmitting / receiving section 160 of the CPU 16 in FIG.
If the address included in the signal component received at 164 or the like is a new address that is not stored in the address memory 166, the distribution control unit 162 determines which phase the power line communication device is connected to. , An automatic learning function of adding the new address to the address memory 166. For this reason, even if the power line carrier communication device is added to the power line later, a new address is registered in the address memory 166 only by performing communication once, and the power line bridge based on the new address memory 166 is used in the second and subsequent communication. Since it is determined whether or not the device 10 can pass, quick response is possible, and communication reliability and communication capability are prevented from being reduced, and reliability can be improved. Furthermore, in the present embodiment, the addresses included in the signal components received by the transmission / reception units 160 and 164 of the CPU 16 in FIG. 2 are stored in the address memory 166. When there is a change, an automatic learning function of rewriting the address memory 166 with the previous address as the address of the communication device connected to the new phase is provided. For this reason, even if a certain power line carrier communication device is detached and reconnected to a power line of a different phase, the address in the address memory 166 is automatically rewritten only by performing communication once. It is also possible to quickly respond to the transfer of the device, prevent communication failure and decrease communication capability, and improve reliability.

[0010]

According to the first aspect of the present invention, the power lines between different phases are insulated from each other by the separating means, high-frequency signal components are passed, and signal components in a specific band are selectively passed by the filter. The communication device connected to each phase is grasped by the distributing means, and only the signal component in the inter-phase communication is passed, so the number of communication devices connected to the power line increases, Even if the transmission is performed, unnecessary signal transmission is not performed between the different phases, so that it is possible to greatly reduce the communication failure and the reduction in the communication capability, and improve the reliability. According to the second aspect of the present invention, the distribution unit receives the signal component in the receiving unit, and includes an address memory in which the address of the communication device connected to each phase is stored. The address of the received signal component is compared with the address of the address memory, and the signal component in the inter-phase communication is permitted to pass, and the transmitting unit transmits the signal component to another phase, and rejects the signal component of the inter-phase communication. As a result, the number of communication devices connected to the power line increases, and even when data transmission is performed by the broadcast method, unnecessary signal transmission between different phases is not performed. And reliability can be improved.

According to the third aspect of the invention, when the address received by the receiving unit is not stored in the address memory, the distribution control unit determines which phase the communication device is connected to. Since it has an automatic learning function of grasping and adding an address to the address memory, even if a communication device is added later, once communication is performed, processing is performed based on the registered address from the second time onward. From that
It is possible to promptly respond to the addition of a communication device, prevent communication failure or a decrease in communication capability, and improve reliability. According to the invention described in claim 4, the distribution control unit includes:
Even if the address received by the receiving unit is stored in the address memory, if the connected phase of the communication device is changed, the address memory is rewritten with the previous address as the address of the communication device connected to the new phase. Therefore, even if communication equipment is changed or moved between different phases,
It is possible to promptly respond to this, prevent communication failure or reduction in communication capability, and improve reliability.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a power line communication system to which a power line bridge device according to the present embodiment is connected.

FIG. 2 is a block diagram illustrating a configuration example of a CPU 16 of FIG.

FIG. 3 is a diagram illustrating a format structure of data transmitted and received in the power line communication system of FIG.

FIG. 4 is a schematic diagram showing states of in-phase communication and out-of-phase communication.

FIG. 5 is a diagram illustrating a state in which a single-phase three-wire power line is divided into power receiving boards of different phases in a power distribution board.

FIG. 6 is a diagram showing a schematic configuration of a power line communication system to which a conventional power line bridge device is connected.

[Explanation of symbols]

 A1, A2 power receiving board, W1, W2 power line, S1, S2, S3 power line carrier communication device, 10 power line bridge device, 12, 20, separation unit, 14, 18 filter, 16 CPU, 162 distribution control unit, 160, 164 transmission and reception Section, 166 address memory, 162 distribution control section, 22 header section, 24 data section, 22a own address, 22b partner address.

Claims (4)

[Claims] 1. A power line bridge device that uses a single-phase three-wire power line and is provided between different phases to enable communication between different phases, wherein the power lines between the different phases are insulated from each other to provide a high-frequency power line. Separation means for passing signal components, a filter for selectively passing signal components in a specific band, and distribution means for grasping communication devices connected to each phase and passing only signal components in interphase communication. A power line bridge device, comprising: 2. The distributing unit stores a receiving unit that receives a signal component transmitted from any one of the phases via the filter, and an address of a communication device connected to each of the phases. The address memory, the address contained in the signal component received by the receiving unit and the address stored in the address memory are compared, and if the signal component is in interphase communication, the passage is permitted, and the signal in inphase communication is The distribution control unit, which rejects passage if the component is included, and a transmission unit that transmits a signal component permitted to pass by the distribution control unit to another phase, wherein: The power line bridge device as described in the above. 3. The distribution control unit, if an address included in the signal component received by the reception unit is a new address that is not stored in the address memory, is connected to any phase of the address memory. The power line bridge device according to claim 2, wherein the address is added by ascertaining whether the communication device is a communication device. 4. The distribution control unit, wherein an address included in a signal component received by the reception unit is stored in the address memory, but when a phase connected to a communication device is changed, 3. The power line bridge device according to claim 2, wherein the address memory is rewritten using the previous address as the address of the communication device connected to the new phase.