JP2001313595A - Power line carrier communication method and power line carrier communication system - Google Patents
Power line carrier communication method and power line carrier communication systemInfo
- Publication number
- JP2001313595A JP2001313595A JP2000127780A JP2000127780A JP2001313595A JP 2001313595 A JP2001313595 A JP 2001313595A JP 2000127780 A JP2000127780 A JP 2000127780A JP 2000127780 A JP2000127780 A JP 2000127780A JP 2001313595 A JP2001313595 A JP 2001313595A
- Authority
- JP
- Japan
- Prior art keywords
- power line
- station device
- slave station
- communication
- communication signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
Landscapes
- Selective Calling Equipment (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、工場、ビル、家
庭内等において電力線を利用してデータ伝送を行い、セ
ンサ情報を収集したり、機器制御を行う電力線通信方法
及び電力線通信システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line communication method and a power line communication system for transmitting data using a power line in factories, buildings, homes, and the like, collecting sensor information, and controlling devices.
【０００２】[0002]
【従来の技術】図４は、例えば特開平７−２３５８９７
号公報に示された従来の電力線通信システムである。図
において、２１はＬ１相の電力線、２２は中性線である
電力線、２３はＬ２相の電力線、２４ａ、２４ｂ、２４
ｃは伝送装置、２５はバイパス回路である。バイパス回
路２５は、結合コンデンサ２６ａ、２６ｂ、高周波信号
伝達トランス２７、高周波信号伝達トランス２７の１次
側コイル２８ａ、２次側コイル２８ｂから構成され、低
域の周波数は通過させないで、高域の信号周波数のみ通
過させるように形成されている。2. Description of the Related Art FIG.
This is a conventional power line communication system disclosed in Japanese Patent Application Laid-Open Publication No. H10-26095. In the figure, 21 is an L1-phase power line, 22 is a neutral power line, 23 is an L2-phase power line, 24a, 24b, 24
c is a transmission device, 25 is a bypass circuit. The bypass circuit 25 includes coupling capacitors 26a and 26b, a high-frequency signal transmission transformer 27, and a primary coil 28a and a secondary coil 28b of the high-frequency signal transmission transformer 27. It is formed to pass only the signal frequency.
【０００３】次に従来の電力線通信システムの動作につ
いて説明する。図４において、伝送装置２４a〜２４ｃ
は、電力線間の商用周波に図示しない変調器で変調した
商用周波よりも高い周波数信号を重畳して通信を行う。
伝送装置２４ａと伝送装置２４ｂは、Ｌ１相の電力線２
１と中性線である電力線２２を使用して通信を行う。一
方、伝送装置２４ａと伝送装置２４ｃは、バイパス回路
２５を介して、Ｌ１相の電力線２１と中性線である電力
線２２とＬ２相の電力線２３を使用して通信を行う。以
上のことから、多線式電力線を使用した既設の工場やビ
ル、家庭内において、伝送装置２４ａ、２４ｂ、２４ｃ
と電力線２１、２２、２３の接続点、例えばコンセント
等への配線は場所によって異なった電力線対への接続と
なっていても、低域の周波数は通過させないで、高域の
信号周波数のみ通過させるバイパス回路２５を設置した
ので、異なる電力線対間に接続された伝送装置２４ａと
伝送装置２４ｃも通信できる。Next, the operation of the conventional power line communication system will be described. In FIG. 4, transmission devices 24a to 24c
Performs communication by superimposing a frequency signal higher than the commercial frequency modulated by a modulator (not shown) on the commercial frequency between power lines.
The transmission device 24a and the transmission device 24b are connected to the L1-phase power line 2
1 and the power line 22 which is a neutral line. On the other hand, the transmission device 24a and the transmission device 24c communicate with each other via the bypass circuit 25 using the L1-phase power line 21, the neutral power line 22 and the L2-phase power line 23. From the above, in existing factories, buildings, and homes using multi-wire power lines, the transmission devices 24a, 24b, 24c
The connection to the power lines 21, 22, and 23, for example, the outlet, is connected to a different pair of power lines depending on the location, but does not pass low-frequency but only high-frequency signal frequencies. Since the bypass circuit 25 is provided, the transmission devices 24a and 24c connected between different power line pairs can also communicate with each other.
【０００４】[0004]
【発明が解決しようとする課題】従来の電力線通信シス
テムでは、異なる電力線対間に接続された伝送装置２４
ａと２４ｃ間で通信を行うためには、高周波信号伝達ト
ランス２７と結合コンデンサ２６ａ、２６ｂによって構
成されたバイパス回路２５を設置する必要があるため、
部品或は設置工事のためのコストが高いという問題があ
った。また、各電力線２１、２２、２３は接続される機
器やその動作に応じてインピーダンスが変動するため、
バイパス回路２５の高周波信号の伝達特性を良好に保つ
ためには、コンデンサ２６ａ、２６ｂやコイル２８ａ、
２８ｂの定数を各電力線２１、２２、２３の特性に合わ
せて調整しなければならないという問題があった。In a conventional power line communication system, a transmission device 24 connected between different power line pairs is used.
In order to communicate between a and 24c, it is necessary to install a bypass circuit 25 composed of a high-frequency signal transmission transformer 27 and coupling capacitors 26a and 26b.
There is a problem that the cost for parts or installation work is high. In addition, since the impedance of each of the power lines 21, 22, and 23 varies depending on the connected device and its operation,
In order to maintain good transfer characteristics of the high frequency signal of the bypass circuit 25, the capacitors 26a and 26b and the coil 28a,
There is a problem that the constant of 28b must be adjusted according to the characteristics of the power lines 21, 22, and 23.
【０００５】この発明は、かかる問題点を解決するため
になされたものであり、バイパス回路がなくても任意の
電力線対間に接続された装置間で通信でき、伝達特性の
調整が不要で通信の信頼性が高い電力線通信方法及び電
力通信システムを得ることを目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and communication can be performed between devices connected between any pair of power lines without a bypass circuit. It is an object of the present invention to obtain a power line communication method and a power communication system with high reliability.
【０００６】[0006]
【課題を解決するための手段】この発明に係る電力線通
信方法は、多線式電力線の電力線間に印加される商用周
波にこの周波数より高い周波数の通信信号を重畳して親
局装置と子局装置との間で電力線通信を行う電力線通信
方法において、上記親局装置は、上記多線式電力線に接
続され上記通信信号を入力する工程と、この入力工程で
入力された通信信号に基づいてこの通信信号を発信した
子局装置及びこの子局装置が接続された電力線対を検出
する工程と、この検出工程で検出した子局装置及び電力
線対の対応を記憶する工程と、子局装置に対して電力線
通信を行うとき、上記記憶工程で記憶した子局装置及び
電力線対の情報に基づいて、この子局装置が接続された
電力線対に接続を切り換える工程と、この切換工程で接
続された電力線対に通信信号を重畳させて出力する出力
工程とを含むものである。A power line communication method according to the present invention is characterized in that a communication signal having a frequency higher than this frequency is superimposed on a commercial frequency applied between power lines of a multi-wire power line and a master station and a slave station. In the power line communication method of performing power line communication with the device, the master station device is connected to the multi-wire power line to input the communication signal, and based on the communication signal input in the input step, A step of detecting the slave station device that has transmitted the communication signal and the power line pair to which the slave station device is connected; a process of storing the correspondence between the slave station device and the power line pair detected in the detection step; When performing power line communication, the step of switching the connection to the power line pair to which the slave station device is connected based on the information of the slave station device and the power line pair stored in the storage step, and the power line connected in the switching step. versus It is intended to include an output step of outputting by superimposing a communication signal.
【０００７】また、入力工程で入力された通信信号に基
づいて新たな子局装置の接続を検出する工程を含むもの
であるまた、検出工程は、第１の子局装置からの通信信
号が第２の子局装置への通信が必要であるか否かを検出
する工程と、この検出工程で第２の子局装置への通信が
必要なとき、第２の子局装置が接続された電力線対に接
続を切換える工程と、この切換工程で電力線対を切換え
た後、上記通信信号を商用周波に重畳させ上記第２の子
局装置へ出力する工程とを含むものである。Further, the method includes a step of detecting a connection of a new slave station device based on the communication signal input in the input step. The detecting step includes the step of detecting a communication signal from the first slave station device to the second slave station device. A step of detecting whether or not communication to the slave station apparatus is required; and a step of detecting whether communication to the second slave station apparatus is required in the detection step, to a power line pair to which the second slave station apparatus is connected. The method includes a step of switching the connection and a step of, after switching the power line pair in the switching step, superimposing the communication signal on the commercial frequency and outputting it to the second slave station device.
【０００８】また、この発明の電力線通信装置は、多線
式電力線の電力線間に印加される商用周波にこの周波数
より高い周波数の通信信号を重畳して親局装置と子局装
置との間で電力線通信を行う電力線通信システムにおい
て、上記親局装置は、上記多線式電力線に接続され上記
通信信号を入力する入力手段と、この入力手段に入力さ
れた通信信号に基づいてこの通信信号を発信した子局装
置及びこの子局装置が接続された電力線対を検出する検
出手段と、この検出手段で検出した子局装置及び電力線
対の対応を記憶する記憶手段と、子局装置に対して電力
線通信を行うとき、上記記憶手段から子局装置及び電力
線対の情報を読込みこの情報に基づいて、この子局装置
が接続された電力線対に接続を切り換える切換手段と、
この切換手段に接続された電力線対に通信信号を重畳さ
せて出力する出力手段とを備えたものである。Further, the power line communication apparatus of the present invention superimposes a communication signal having a frequency higher than this frequency on the commercial frequency applied between the power lines of the multi-wire power line, so that the communication between the master station apparatus and the slave station apparatus. In a power line communication system for performing power line communication, the master station device includes an input unit connected to the multi-wire power line and inputting the communication signal, and transmits the communication signal based on the communication signal input to the input unit. Detection means for detecting the slave station device and the power line pair to which the slave station device is connected, storage means for storing the correspondence between the slave station device and the power line pair detected by the detection means, and a power line for the slave station device. When performing communication, switching means for reading the information of the slave station device and the power line pair from the storage means, based on the information, switching the connection to the power line pair to which the slave station device is connected,
Output means for superimposing and outputting a communication signal on the power line pair connected to the switching means.
【０００９】[0009]
【発明の実施の形態】実施の形態１．以下この発明の実
施の形態１について説明する。図１はこの発明の一実施
の形態を示す親局装置のブロック図である。図におい
て、１は親局装置であり、結合回路２、振幅抽出部３、
中央処理演算部であるＣＰＵ(central processing uni
t)４、ＲＯＭ（read only memory）７、ＲＡＭ(random
access memory)８、ＥＥＰＲＯＭ（electrically erasa
ble and programmable read only memory）９からなる
記憶手段、電源１０により構成される。結合回路２は電
力線２１、２２、２３に接続され、一次側コイルＬ１と
二次側コイルＬ２を有するトランスT、及び結合コンデ
ンサＣ１、Ｃ２により構成されている。コイルL１、L２
のリアクタンスとコンデンサC１、C２は夫々等しいもの
を用いることが好ましい。振幅抽出部３は、結合回路２
に接続され、高周波信号が重畳された商用周波から高周
波信号のみを抽出しその結果をＣＰＵ４に通知するもの
であり、例えば、高周波信号のみを抽出するハイパスフ
ィルタとこのハイパスフィルタの出力をディジタル変換
してＣＰＵ４へ出力するＡ／Ｄ（analog/digital）変換
部により構成されている。通信制御手段５は、受信時
に、子局装置から送られた通信信号を抽出しその抽出デ
ータを復調するとともに、送信時に、ＣＰＵ４からの送
信データを変調し商用周波に重畳させるように送出する
ものであり、図示しない復調回路と、Ａ／Ｄ変換部と、
変調回路とＤ／Ａ（digital/analog）変換部を有してい
る。切換手段６はＣＰＵ４からの出力に基づいて通信に
利用する電力線対を切換えるものである。電源１０は電
力線２１、２２に接続され図示しない電源回路により親
局装置１のＣＰＵ４等へ駆動電力を供給する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described. FIG. 1 is a block diagram of a master station device showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a master station device, a coupling circuit 2, an amplitude extracting unit 3,
CPU (central processing uni
t) 4, ROM (read only memory) 7, RAM (random)
access memory) 8, EEPROM (electrically erasa
ble and programmable read only memory) 9 and a power supply 10. The coupling circuit 2 is connected to the power lines 21, 22, and 23, and includes a transformer T having a primary coil L1 and a secondary coil L2, and coupling capacitors C1 and C2. Coil L1, L2
And the capacitors C1 and C2 are preferably equal to each other. The amplitude extracting unit 3 includes the coupling circuit 2
The high-frequency signal is extracted from the commercial frequency on which the high-frequency signal is superimposed, and the result is notified to the CPU 4. For example, a high-pass filter that extracts only the high-frequency signal and the output of the high-pass filter are digitally converted. And an A / D (analog / digital) converter for outputting to the CPU 4. The communication control means 5 extracts the communication signal sent from the slave station device at the time of reception and demodulates the extracted data. At the time of transmission, the communication control means 5 modulates the transmission data from the CPU 4 and sends it out so as to be superimposed on the commercial frequency. A demodulation circuit (not shown), an A / D converter,
It has a modulation circuit and a D / A (digital / analog) converter. The switching means 6 switches a power line pair used for communication based on an output from the CPU 4. The power supply 10 is connected to the power lines 21 and 22 and supplies driving power to the CPU 4 and the like of the master station device 1 by a power supply circuit (not shown).
【００１０】図２は、図1の親局装置を用いた電力線通
信システムの構成を示すブロック図である。図におい
て、１１ａ、１１ｂは子局装置であり、電源部、商用周
波に重畳された通信信号から通信信号のみを抽出する抽
出部と、抽出部により抽出された通信信号をディジタル
変換するＡ／Ｄ変換部と、ディジタル変換されたデータ
を復調する復調部とからなる受信部、送信するデータを
変調する変調部と、変調されたデータをアナログ変換す
るＤ／Ａ変換部と、アナログ変換した通信信号を商用周
波に重畳する重畳部とからなる送信部、及び受信部、送
信部を制御する制御部を有している。また、子局装置１
１ａはセンサ１２からセンシング情報を収集するセンシ
ング部を有するとともにセンサ１２に関する情報を記憶
し、子局装置１１ｂは制御機器１３に対する制御部を有
するとともに制御機器１３に関する情報を記憶してい
る。１２は子局装置１１ａに接続されるセンサ、１３は
子局装置１１ｂに接続される制御機器を示している。例
えば、電力線通信により、親局装置１はセンサ１２の検
出結果を収集したり、制御機器１３を制御したりする。FIG. 2 is a block diagram showing a configuration of a power line communication system using the master station device of FIG. In the figure, reference numerals 11a and 11b denote slave station devices, a power supply unit, an extraction unit for extracting only a communication signal from a communication signal superimposed on a commercial frequency, and an A / D for digitally converting the communication signal extracted by the extraction unit. A receiving unit including a conversion unit and a demodulation unit for demodulating digitally converted data; a modulation unit for modulating data to be transmitted; a D / A conversion unit for converting the modulated data into an analog signal; And a control unit for controlling the transmitting unit, the transmitting unit including a superimposing unit that superimposes on the commercial frequency. Also, the slave station device 1
1a has a sensing unit that collects sensing information from the sensor 12 and stores information about the sensor 12, and the slave station device 11b has a control unit for the control device 13 and stores information about the control device 13. Reference numeral 12 denotes a sensor connected to the slave station device 11a, and reference numeral 13 denotes a control device connected to the slave station device 11b. For example, the master station device 1 collects the detection results of the sensor 12 and controls the control device 13 by power line communication.
【００１１】次に、動作について説明する。 （初期設定）親局装置１が接続されたシステムに、新た
に子局装置１１ａを接続する場合について説明する。子
局装置１１ａを電力線２１、２２に接続すると子局装置
１１ａの図示しない電源部により子局装置１１ａの図示
しない制御部に電力が供給される（Ｓ１０）。子局装置
１１ａは、後述するＳ２４により親局装置１からの応答
があるまで、あらかじめ決められた回数或はあらかじめ
決められた時間所定のタイミング（間欠的に）で、自分
に割り振られているアドレス番号と接続されるセンサ１
２に関わる情報、例えばセンサ１２の定格値、センサ１
２によるセンシングのタイミング等の情報を、変調した
高周波の通信信号を商用周波に重畳して送信する（Ｓ１
２）。子局装置１１ａはあらかじめ決められた回数或は
あらかじめ決められた時間送信しても親局装置１からの
応答がないときには、エラー表示をするように構成する
ことが好ましい。この通信信号は、結合回路２によって
降圧され親局装置１に取り込まれる（Ｓ１４）。Next, the operation will be described. (Initial Setting) A case where a slave station device 11a is newly connected to a system to which the master station device 1 is connected will be described. When the slave station device 11a is connected to the power lines 21 and 22, power is supplied from a power supply unit (not illustrated) of the slave station device 11a to a control unit (not illustrated) of the slave station device 11a (S10). The slave station device 11a assigns an address assigned to itself at a predetermined number of times or at a predetermined timing (intermittently) until a response is received from the master station device 1 in S24 described later. Sensor 1 connected to the number
2, such as the rated value of the sensor 12 and the sensor 1
2 is transmitted with the modulated high-frequency communication signal superimposed on the commercial frequency (S1).
2). It is preferable that the slave station device 11a be configured to display an error when there is no response from the master station device 1 even after transmission for a predetermined number of times or for a predetermined time. This communication signal is stepped down by the coupling circuit 2 and taken into the master station device 1 (S14).
【００１２】振幅抽出部３は、各線間の受信電圧から低
域成分である商用周波のみを除去して高周波の通信信号
を抽出し、その信号振幅に関わる出力をＣＰＵ４に出力
する（Ｓ１６）。この出力に基づいてＣＰＵ４は、通信
信号を受信しているか否かを例えば振幅抽出部３の出力
の絶対値の大きさにより判別する（Ｓ１８）。そして、
ＣＰＵ４は、通信信号を受信していると判別したときに
は、その信号を発生する子局装置１１ａが電力線２１〜
２３の何れの２線に接続されているかを判別し、切換手
段６の接続タップを子局装置１１ａの接続されている電
力線対と同じとなるよう制御する（Ｓ１８）。通信制御
手段５は、子局装置１１ａから送信されてきたデータを
復調して、子局装置１１ａの通信アドレス及びセンサ１
２に関わる情報を得る（Ｓ２０）。この通信アドレス１
１ａ、センサ１２に関わる情報、及び振幅検出部３の出
力に基づいてＣＰＵ４が判別した子局装置１１ａが接続
される電力線対（本実施の形態１では電力線対２１、２
２）の情報を、ＲＡＭ８及びＥＥＰＲＯＭ９に格納する
（Ｓ２２）。ついで、通信制御部５は、接続の認識を終
了した旨のデータを変調した通信信号を商用周波に重畳
させ、子局装置１１ａへ送信する（Ｓ２４）。子局装置
１１ａは、この通信信号を受信したとき、Ｓ１２による
初期設定のための通信信号の送信を停止する（Ｓ２
６）。なお、子局装置１１ｂが新設された場合について
も同様の要領にて登録することができる。The amplitude extractor 3 removes only the commercial frequency, which is a low-frequency component, from the received voltage between the lines to extract a high-frequency communication signal, and outputs an output relating to the signal amplitude to the CPU 4 (S16). Based on this output, the CPU 4 determines whether or not a communication signal has been received, for example, based on the magnitude of the absolute value of the output of the amplitude extraction unit 3 (S18). And
When the CPU 4 determines that a communication signal is being received, the slave station device 11a that generates the signal transmits the power lines 21 to
It is determined which of the two lines 23 is connected, and the connection tap of the switching means 6 is controlled to be the same as the power line pair connected to the slave station device 11a (S18). The communication control means 5 demodulates the data transmitted from the slave station device 11a, and stores the communication address of the slave station device 11a and the sensor 1
The information relating to No. 2 is obtained (S20). This communication address 1
1a, a power line pair to which the slave station device 11a determined by the CPU 4 based on the information on the sensor 12 and the output of the amplitude detector 3 is connected (in the first embodiment, the power line pairs 21 and 2
The information of 2) is stored in the RAM 8 and the EEPROM 9 (S22). Next, the communication control unit 5 superimposes a communication signal obtained by modulating data indicating that connection recognition has been completed on the commercial frequency, and transmits the signal to the slave station device 11a (S24). When receiving the communication signal, the slave station device 11a stops transmitting the communication signal for the initial setting in S12 (S2).
6). It should be noted that even when the slave station device 11b is newly installed, it can be registered in a similar manner.
【００１３】（定常通信）親局装置１が、子局装置１１
ａにデータ通信を行う場合には、ＣＰＵ４はＲＡＭ８に
記憶した電力線対情報に基づいて切換手段６を伝送子局
１１ａが接続された電力線対２１、２２に切り換える
（Ｓ３０）。ついで、ＣＰＵ４からの指令により、通信
制御手段５は通信する電文、例えばセンサ１２の計量情
報の収集指令のデータを変調した通信信号を商用周波に
重畳させ、子局装置１１ａへ送信する（Ｓ３２） 子局装置１１ａは受信した通信信号が親局装置１１ａか
らのものと認識したとき、センサ１２の計量値に関する
データを変調し、商用周波に重畳させ親局装置１へ返送
する（Ｓ３４）。子局装置１１ａから返送された通信信
号を通信制御手段５で復調し、ＣＰＵ４は計量値の情報
を得る（Ｓ３６）。Ｓ３０により切換手段６を切り換え
た後、Ｓ３４により子局装置１１ａから返送があるまで
切換手段６の接続する電力線対が固定されている場合に
ついて説明したが、通信信号のやり取りの多いシステム
等の場合には、Ｓ３０により切換手段６を切り換えた
後、Ｓ３４の前に子局装置１１ａに接続される電力線対
に切換える工程を付加してする構成とすれば良い。(Regular communication) The master station device 1 is
When data communication is performed with a, the CPU 4 switches the switching means 6 to the power line pairs 21 and 22 to which the transmission slave station 11a is connected based on the power line pair information stored in the RAM 8 (S30). Next, in response to a command from the CPU 4, the communication control means 5 superimposes a communication message, for example, a communication signal obtained by modulating data of a command to collect measurement information of the sensor 12 on a commercial frequency, and transmits the signal to the slave station device 11a (S32). When the slave station device 11a recognizes that the received communication signal is from the master station device 11a, the slave station device 11a modulates data relating to the measured value of the sensor 12, superimposes the data on the commercial frequency, and returns the data to the master station device 1 (S34). The communication signal returned from the slave station device 11a is demodulated by the communication control means 5, and the CPU 4 obtains information on the weighing value (S36). After switching the switching means 6 in S30, the case where the power line pair connected to the switching means 6 is fixed until returning from the slave station device 11a in S34 has been described. However, in the case of a system where communication signals are frequently exchanged, etc. After the switching of the switching means 6 in S30, a step of switching to the power line pair connected to the slave station device 11a before S34 may be added.
【００１４】（停電時）例えば停電によって、親局装置
１への電源供給が失われた場合には、電源１０の出力電
圧の低下又はＲＡＭ８への供給電圧が低下する。電源１
０の出力電圧の低下が検出されたとき、又はＲＡＭ８へ
の供給電圧の低下が検出されたとき、ＣＰＵ４は、ＥＥ
ＰＲＯＭ９のデータをＲＡＭ８に複写する（Ｓ４０）。
その後、Ｓ３０〜Ｓ３６の手順によって通信を行うこと
により、通信を継続することができる。(At the time of power failure) For example, when the power supply to the master station device 1 is lost due to a power failure, the output voltage of the power supply 10 decreases or the supply voltage to the RAM 8 decreases. Power supply 1
When a decrease in the output voltage of the RAM 8 is detected, or when a decrease in the supply voltage to the RAM 8 is detected, the CPU 4
The data in the PROM 9 is copied to the RAM 8 (S40).
Thereafter, by performing communication according to the procedures of S30 to S36, communication can be continued.
【００１５】以上のように構成したので、従来のような
バイパス回路が不要であり、伝達特性の調整が不要であ
り、部品或は設置工事のためのコストを安くできる。ま
た、切換手段６により電力線対を切換え、通信をする子
局装置が接続された電力線対のみの商用周波に通信信号
を重畳させるので、全ての電力線対の商用周波に通信信
号を重畳させる場合に比較し、親局装置１の消費電力を
少なくできる。ここで、商用周波に重畳させた通信信号
による通信はノイズの影響が大きく、親局装置１が消費
する電力のうち、通信制御手段５による通信信号の送信
に係る電力が大部分を占めることから消費電力の低減に
よるメリットは大きい。[0015] With the above configuration, the conventional bypass circuit is not required, the transfer characteristics need not be adjusted, and the cost for parts or installation work can be reduced. Further, since the power line pair is switched by the switching means 6 and the communication signal is superimposed on the commercial frequency of only the power line pair to which the slave station device for communication is connected, the communication signal is superimposed on the commercial frequency of all the power line pairs. In comparison, the power consumption of the master station device 1 can be reduced. Here, the communication by the communication signal superimposed on the commercial frequency has a large influence of noise, and the power related to the transmission of the communication signal by the communication control unit 5 occupies a large part of the power consumed by the master station device 1. The benefits of reducing power consumption are significant.
【００１６】なお、上記説明では、振幅抽出部３の出力
に基づいてＣＰＵ４が切換手段６を制御するよう構成し
ているが、振幅抽出部３の出力信号により直接切換手段
６を制御するよう構成してもよい。また、上述の説明で
は、電力線が単相３線式の場合について説明したが、三
相３線式等他の多線式電力線の場合にも適用できる。In the above description, the CPU 4 controls the switching means 6 based on the output of the amplitude extracting section 3. However, the CPU 4 controls the switching means 6 directly based on the output signal of the amplitude extracting section 3. May be. In the above description, the case where the power line is a single-phase three-wire system has been described.
【００１７】実施の形態２．以下この発明の実施の形態
２について説明する。実施の形態２では子局装置１１ａ
から子局装置１１ｂに通信する例について説明する。図
３は実施の形態２に係る電力通信システムの親局装置の
動作を説明するフローチャートである。子局装置１１ａ
は、宛先に子局装置１１ｂのアドレスを指定した電文を
変調した通信信号を商用周波に重畳させて送信する。親
局装置１は、振幅抽出部３からの出力をチェックし、Ｃ
ＰＵ４が通信信号の入力を検出する（Ｓ５０）ととも
に、この通信信号を発生した子局装置１１ａが接続され
た電力線対２１、２２を検出し、切換手段６の接続タッ
プを電力線対２１、２２に切り換える（Ｓ５２）。Embodiment 2 FIG. Hereinafter, a second embodiment of the present invention will be described. In the second embodiment, the slave station device 11a
An example in which communication is performed with the slave station device 11b will be described. FIG. 3 is a flowchart illustrating the operation of the master station device of the power communication system according to the second embodiment. Slave station device 11a
Transmits a communication signal obtained by modulating a telegram in which the address of the slave station device 11b is specified as the destination is superimposed on the commercial frequency. The master station device 1 checks the output from the amplitude extraction unit 3 and
The PU 4 detects the input of the communication signal (S50), detects the power line pairs 21 and 22 to which the slave station device 11a that has generated the communication signal is connected, and sets the connection tap of the switching means 6 to the power line pairs 21 and 22. Switching is performed (S52).
【００１８】子局装置１１ａが送信した通信信号を、通
信制御手段５で復調したデータの宛先アドレスをＣＰＵ
４はＲＡＭ８に記憶されている親局装置１、子局装置１
１ａ及び子局装置１１ｂの各アドレスと照合し（Ｓ５
４）、親局装置１以外のアドレスに一致するとき、転送
用の通信信号であると判断する（Ｓ５６）。Ｓ５６にお
いて、転送用の通信信号と判断したときは、ＣＰＵ４は
切換手段６を通信信号の宛先アドレスを有する子局装置
１１ｂが接続される電力線対２２、２３に切り換えた
後、通信制御手段５はこの通信信号を変調して商用周波
に重畳させ送信する（Ｓ５８）。その後、子局装置１１
ｂは親局装置１から送信された通信信号を受信する。つ
まり、親局装置１が各子局装置からの信号を中継するこ
ととなり、異なる電力線対間に接続される子局装置１１
ａと子局装置１１ｂが通信できる。The destination address of the data obtained by demodulating the communication signal transmitted by the slave station device 11a by the communication control means 5 is determined by the CPU.
Reference numeral 4 denotes a master station device 1 and a slave station device 1 stored in a RAM 8.
1a and each address of the slave station device 11b (S5).
4) When the address matches the address other than that of the master station 1, it is determined that the signal is a transfer communication signal (S56). When it is determined in S56 that the communication signal is a transfer communication signal, the CPU 4 switches the switching means 6 to the power line pairs 22 and 23 to which the slave station device 11b having the destination address of the communication signal is connected. This communication signal is modulated, superimposed on the commercial frequency, and transmitted (S58). Then, the slave station device 11
b receives the communication signal transmitted from the master station device 1. That is, the master station device 1 relays signals from the respective slave station devices, and the slave station devices 11 connected between different power line pairs.
a can communicate with the slave station device 11b.
【００１９】一方、Ｓ５６において、転送用の通信信号
と判断しなかったとき、すなわちＲＡＭ８に記憶された
子局装置１１ａ、１１ｂ以外のアドレスであったとき、
親局装置１宛のアドレスであるか否かを検出する（Ｓ６
０）。Ｓ６０において、親局装置１宛のアドレスが検出
されたときは、さらに、通信データの内容が子局装置１
の新たな設置に係るものであるかを否かを検出し、子局
装置の新設のときには、実施の形態１と同様にしてこの
子局装置の通信アドレス等の情報をＲＡＭ８及びＥＥＰ
ＲＯＭ９に記憶させ、（Ｓ６４）、一方、子局装置の新
設でないときには、通常の通信における親局装置１から
の要求に対する返信と判断されるので、この返信データ
のうち必要なデータを保管する（Ｓ６６）。Ｓ６０にお
いて、親局装置１宛のアドレスでないと検出されたとき
は、ＲＡＭ８に記憶されていない宛先のアドレスである
ので、親局装置１の図示しないエラー表示部にエラー表
示をする。On the other hand, in S56, when it is not determined that the communication signal is a transfer communication signal, that is, when the address is other than the slave station devices 11a and 11b stored in the RAM 8,
It is detected whether or not the address is addressed to the master station device 1 (S6).
0). In S60, when the address addressed to the master station device 1 is detected, the content of the communication data is further changed to the slave station device 1.
It is detected whether or not this is related to the new installation of the slave station device. When the slave station device is newly installed, information such as the communication address of the slave station device is stored in the RAM 8 and the EEP as in the first embodiment.
On the other hand, when the slave station device is not newly established, it is determined that the request is sent in response to the request from the master station device 1 in the normal communication, and the necessary data in the return data is stored (S64). S66). In S60, when it is detected that the address is not the address addressed to the master station device 1, the error is displayed on an error display unit (not shown) of the master station device 1 because the address is a destination address not stored in the RAM 8.
【００２０】以上のように構成したので、親局装置１が
各子局装置からの信号を中継すれこととなり、異なる電
力線対間に接続される子局装置１１ａと子局装置１１ｂ
が通信できる。また、異なる電力線対間に通信信号を送
るとき、親局装置１は単に受信信号を転送するのではな
く、通信制御手段５により新たに送信する先の電力線対
に通信信号を重畳して送信するので、通信信号が減衰す
ることなく確実に送信でき、通信の信頼性が高い。With the above configuration, the master station device 1 relays signals from the slave station devices, and the slave station devices 11a and 11b connected between different power line pairs.
Can communicate. Further, when transmitting a communication signal between different power line pairs, the master station device 1 does not simply transfer the received signal, but superimposes the communication signal on the newly transmitted power line pair by the communication control means 5 and transmits the signal. Therefore, the communication signal can be reliably transmitted without attenuation, and communication reliability is high.
【００２１】[0021]
【発明の効果】この発明に係る電力線通信方法は、多線
式電力線の電力線間に印加される商用周波にこの周波数
より高い周波数の通信信号を重畳して親局装置と子局装
置との間で電力線通信を行う電力線通信方法において、
上記親局装置は、上記多線式電力線に接続され上記通信
信号を入力する工程と、この入力工程で入力された通信
信号に基づいてこの通信信号を発信した子局装置及びこ
の子局装置が接続された電力線対を検出する工程と、こ
の検出工程で検出した子局装置及び電力線対の対応を記
憶する工程と、子局装置に対して電力線通信を行うと
き、上記記憶工程で記憶した子局装置及び電力線対の情
報に基づいて、この子局装置が接続された電力線対に接
続を切り換える工程と、この切換工程で接続された電力
線対に通信信号を重畳させて出力する出力工程とを含む
ので、伝達特性の調整が不要で通信の信頼性が高いとと
もに消費電力が少ない。According to the power line communication method of the present invention, a communication signal having a frequency higher than this frequency is superimposed on the commercial frequency applied between the power lines of the multi-wire power line, and the communication between the master station device and the slave station device is performed. In the power line communication method for performing power line communication in,
The master station device is connected to the multi-wire power line and inputs the communication signal, and the slave station device that has transmitted the communication signal based on the communication signal input in the input process and the slave station device include: Detecting the connected power line pair, storing the correspondence between the slave station device and the power line pair detected in this detection process, and performing power line communication with the slave station device, A step of switching the connection to the power line pair to which the slave station device is connected based on the information of the station device and the power line pair, and an output step of superimposing and outputting a communication signal on the power line pair connected in the switching step. Since it does not require adjustment of transfer characteristics, communication reliability is high and power consumption is low.
【００２２】また、入力工程で入力された通信信号に基
づいて新たな子局装置の接続を検出する工程を含むの
で、誤入力が発生せず、接続できるので信頼性が高い。In addition, since the method includes a step of detecting a connection of a new slave station device based on a communication signal input in the input step, erroneous input does not occur and connection can be made, so that reliability is high.
【００２３】また、検出工程は、第１の子局装置からの
通信信号が第２の子局装置への通信が必要であるか否か
を検出する工程と、この検出工程で第２の子局装置への
通信が必要なとき、第２の子局装置が接続された電力線
対に接続を切換える工程と、この切換工程で電力線対を
切換えた後、上記通信信号を商用周波に重畳させ上記第
２の子局装置へ出力する工程とを含むので、通信信号の
減衰が少なく通信の信頼性が高い。[0023] The detecting step includes a step of detecting whether a communication signal from the first slave station requires communication with the second slave station, and a step of detecting the second slave station in the detecting step. A step of switching the connection to the power line pair to which the second slave station device is connected when communication to the station apparatus is required; and, after switching the power line pair in the switching step, superimposing the communication signal on the commercial frequency and And outputting to the second slave station device, so that communication signal attenuation is small and communication reliability is high.
【００２４】さらにまた、この発明の電力線通信装置
は、多線式電力線の電力線間に印加される商用周波にこ
の周波数より高い周波数の通信信号を重畳して親局装置
と子局装置との間で電力線通信を行う電力線通信システ
ムにおいて、上記親局装置は、上記多線式電力線に接続
され上記通信信号を入力する入力手段と、この入力手段
に入力された通信信号に基づいてこの通信信号を発信し
た子局装置及びこの子局装置が接続された電力線対を検
出する検出手段と、この検出手段で検出した子局装置及
び電力線対の対応を記憶する記憶手段と、子局装置に対
して電力線通信を行うとき、上記記憶手段から子局装置
及び電力線対の情報を読込みこの情報に基づいて、この
子局装置が接続された電力線対に接続を切り換える切換
手段と、この切換手段に接続された電力線対に通信信号
を重畳させて出力する出力手段とを備えたので、伝達特
性の調整が不要で通信の信頼性が高いとともに消費電力
が少ない。Still further, the power line communication apparatus of the present invention superimposes a communication signal having a frequency higher than this frequency on the commercial frequency applied between the power lines of the multi-wire power line, so that the communication between the master station apparatus and the slave station apparatus is performed. In the power line communication system that performs power line communication in, the master station device is connected to the multi-line power line and input means for inputting the communication signal, and based on the communication signal input to the input means, this master signal Detecting means for detecting the transmitting slave station apparatus and the power line pair to which the slave station apparatus is connected; storage means for storing the correspondence between the slave station apparatus and the power line pair detected by the detecting means; When power line communication is performed, information on the slave station device and the power line pair is read from the storage means, and based on the information, switching means for switching the connection to the power line pair to which the slave station device is connected; Because and output means for outputting by superimposing the connected communication signal to the power line pair, the power consumption with a high less reliable and requires no adjustment of the transmission characteristics communication.
【図１】 この発明の実施の形態１に係る電力通新シス
テムの親局装置を示すブロック図である。FIG. 1 is a block diagram showing a master station device of a power transfer system according to Embodiment 1 of the present invention.
【図２】 この発明の実施の形態１に係る電力線通信シ
ステムを示す構成図である。FIG. 2 is a configuration diagram illustrating a power line communication system according to Embodiment 1 of the present invention.
【図３】 この発明の実施の形態２に係る電力通信シス
テムの親局装置の動作を説明するフローチャートであ
る。FIG. 3 is a flowchart illustrating an operation of a master station device of the power communication system according to Embodiment 2 of the present invention.
【図４】 従来の電力線通信システムを示す構成図であ
る。FIG. 4 is a configuration diagram showing a conventional power line communication system.
１ 親局装置、 ２ 結合回路、 ３ 振幅検出
部、 ４ ＣＰＵ、５ 通信制御手段、 ６ 切換
手段、 ８ ＲＡＭ、 ９ ＥＥＰＲＯＭ、１１
ａ、１１ｂ 子局装置、 １２ センサ、 １３
制御機器、２１、２２、２３ 電力線Reference Signs List 1 master station device, 2 coupling circuit, 3 amplitude detector, 4 CPU, 5 communication control means, 6 switching means, 8 RAM, 9 EEPROM, 11
a, 11b slave station device, 12 sensor, 13
Control equipment, 21, 22, 23 Power line
Claims (4)
用周波にこの周波数より高い周波数の通信信号を重畳し
て親局装置と子局装置との間で電力線通信を行う電力線
通信方法において、 上記親局装置は、 上記多線式電力線に接続され上記通信信号を入力する工
程と、 この入力工程で入力された通信信号に基づいてこの通信
信号を発信した子局装置及びこの子局装置が接続された
電力線対を検出する工程と、 この検出工程で検出した子局装置及び電力線対の対応を
記憶する工程と、 子局装置に対して電力線通信を行うとき、上記記憶工程
で記憶した子局装置及び電力線対の情報に基づいて、こ
の子局装置が接続された電力線対に接続を切り換える工
程と、 この切換工程で接続された電力線対に通信信号を重畳さ
せて出力する出力工程とを含むことを特徴とする電力線
通信方法。1. A power line communication method for performing power line communication between a master station device and a slave station device by superimposing a communication signal having a frequency higher than this frequency on a commercial frequency applied between power lines of a multi-wire power line. The master station device is connected to the multi-wire power line and inputs the communication signal; a slave station device that transmits the communication signal based on the communication signal input in the input process; and the slave station device Detecting the connected power line pair, storing the correspondence between the slave station device and the power line pair detected in the detection process, and performing the power line communication with the slave station device. A step of switching the connection to the power line pair to which the slave station device is connected based on the information of the slave station device and the power line pair; and an output step of superimposing and outputting a communication signal on the power line pair connected in the switching step. Including A power line communication method.
て新たな子局装置の接続を検出する工程を含むことを特
徴とする請求項１記載の電力線通信方法。2. The power line communication method according to claim 1, further comprising a step of detecting a connection of a new slave station device based on the communication signal input in the input step.
信号が第２の子局装置への通信が必要であるか否かを検
出する工程と、 この検出工程で第２の子局装置への通信が必要なとき、
第２の子局装置が接続された電力線対に接続を切換える
工程と、 この切換工程で電力線対を切換えた後、上記通信信号を
商用周波に重畳させ上記第２の子局装置へ出力する工程
とを含むことを特徴とする請求項１記載の電力線通信方
法。3. The detecting step includes: detecting whether a communication signal from the first slave station device requires communication with the second slave station device; and detecting the second slave device in the detecting step. When communication to the station equipment is required,
Switching the connection to the power line pair to which the second slave station device is connected; and, after switching the power line pair in the switching process, superimposing the communication signal on the commercial frequency and outputting the communication signal to the second slave station device. The power line communication method according to claim 1, comprising:
用周波にこの周波数より高い周波数の通信信号を重畳し
て親局装置と子局装置との間で電力線通信を行う電力線
通信システムにおいて、 上記親局装置は、 上記多線式電力線に接続され上記通信信号を入力する入
力手段と、 この入力手段に入力された通信信号に基づいてこの通信
信号を発信した子局装置及びこの子局装置が接続された
電力線対を検出する検出手段と、 この検出手段で検出した子局装置及び電力線対の対応を
記憶する記憶手段と、 子局装置に対して電力線通信を行うとき、上記記憶手段
から子局装置及び電力線対の情報を読込みこの情報に基
づいて、この子局装置が接続された電力線対に接続を切
り換える切換手段と、 この切換手段に接続された電力線対に通信信号を重畳さ
せて出力する出力手段とを備えたことを特徴とする電力
線通信システム。4. A power line communication system for performing power line communication between a master station device and a slave station device by superimposing a communication signal having a frequency higher than this frequency on a commercial frequency applied between power lines of a multi-wire power line. An input unit connected to the multi-wire power line for inputting the communication signal; a slave station device transmitting the communication signal based on the communication signal input to the input unit; and the slave station. Detecting means for detecting the power line pair to which the device is connected; storage means for storing the correspondence between the slave station device and the power line pair detected by the detecting means; and the storage means for performing power line communication with the slave station device. Switching means for switching the connection to the power line pair to which the slave station device is connected based on this information, and superimposing a communication signal on the power line pair connected to the switching device. Output means for folding and outputting the data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000127780A JP2001313595A (en) | 2000-04-27 | 2000-04-27 | Power line carrier communication method and power line carrier communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000127780A JP2001313595A (en) | 2000-04-27 | 2000-04-27 | Power line carrier communication method and power line carrier communication system |
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| Publication Number | Publication Date |
|---|---|
| JP2001313595A true JP2001313595A (en) | 2001-11-09 |
Family
ID=18637314
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000127780A Pending JP2001313595A (en) | 2000-04-27 | 2000-04-27 | Power line carrier communication method and power line carrier communication system |
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| Country | Link |
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| JP (1) | JP2001313595A (en) |
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