JP2001008361A - Power saving system for electrical equipment - Google Patents

Power saving system for electrical equipment

Info

Publication number
JP2001008361A
JP2001008361A JP17502399A JP17502399A JP2001008361A JP 2001008361 A JP2001008361 A JP 2001008361A JP 17502399 A JP17502399 A JP 17502399A JP 17502399 A JP17502399 A JP 17502399A JP 2001008361 A JP2001008361 A JP 2001008361A
Authority
JP
Japan
Prior art keywords
power
electric device
clock
electric
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
Application number
JP17502399A
Other languages
Japanese (ja)
Inventor
Shunji Kashiwazaki
俊二 柏崎
Osamu Wakimoto
修 脇本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Communication Equipment Co Ltd
Original Assignee
Toyo Communication Equipment Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Communication Equipment Co Ltd filed Critical Toyo Communication Equipment Co Ltd
Priority to JP17502399A priority Critical patent/JP2001008361A/en
Publication of JP2001008361A publication Critical patent/JP2001008361A/en
Pending legal-status Critical Current

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  • Electric Clocks (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

PROBLEM TO BE SOLVED: To save power consumption and to eliminate operation setting information and resetting of setting a time by controlling turning on/off of a power source of electrical equipment, using a centralized controller having a clock and a memory means, and storing operation set information of the equipment in the controller. SOLUTION: A centralized controller 6 inputs a set signal of a power turning on/off of electrical equipment 1a, 1b,..., 1n to a control means 3 by using an input means 7, and controls turning on/off of a power source. The means 3 transmits a switching signal to a switching means 2 and supplies operation setting information of the equipment a stored in a memory means 5 via a communication line 8 to the equipment 1a. The control signal of setting a time is supplied to a clock 10a incorporated in the equipment 1a, based on time information input from a clock 4 via the line 8. Thus, the clocks in respective equipment can be prevented from consuming power unnecessarily.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は電気機器の節電シス
テムに関する。
The present invention relates to a power saving system for electric equipment.

【0002】[0002]

【従来の技術】近年、家庭で使用される電気機器(例え
ば、テレビ、ビデオ、炊飯器等の家電機器)には、利用
者の利便性を図るため時計(タイマー)が組み込まれる
ようになった。図3は、複数の電気機器を家庭内に配置
し、屋内に配設された電源に接続した様子を示す機能ブ
ロック図である。この図に示される電気機器30a、30b、
・・・・30nには記憶手段(RAM)34a、34b、・・・・34n及び
時計31a、31b、・・・・31nがそれぞれ内蔵されており、こ
の時計31a、31b、・・・・31nには外部から駆動電源32(常
AC100V)が常時印加されている。また、この駆動
電源32は電源スイッチ33a、33b、・・・・33nを介して図示しな
い回路駆動電源(例えばAC/DCコンバ−タ)に接続
される。この例に示された電気機器は以下の様に機能す
る。即ち各電気機器30a、30b、・・・・30nが電源32に接続
されていれば駆動電源が印加されているので、電源スイ
ッチ33a、33b、・・・・33nのON/OFFに関係なく時計3
1a、31b、・・・・31nは現在時刻信号を刻みつづけることが
でき、現在時刻信号を常に各電気機器に供給することが
できる。したがって、それぞれの電気機器はこの時刻信
号を用いて記憶手段(RAM)34a、34b、・・・・34nに予
め設定した時刻で駆動電源32をON/OFFするといっ
たタイマ−機能を実現することができる。
2. Description of the Related Art In recent years, a clock (timer) has been incorporated in electrical equipment used at home (for example, a home appliance such as a television, a video, a rice cooker, etc.) for the convenience of users. . FIG. 3 is a functional block diagram showing a state in which a plurality of electric devices are arranged in a house and connected to a power supply arranged indoors. The electric devices 30a, 30b,
.., 30n have built-in storage means (RAM) 34a, 34b,... 34n and clocks 31a, 31b,. , A driving power supply 32 (constant AC 100 V) is constantly applied from the outside. The drive power supply 32 is connected to a circuit drive power supply (not shown) (for example, an AC / DC converter) via power switches 33a, 33b,... 33n. The electrical device shown in this example functions as follows. That is, if the electric devices 30a, 30b,... 30n are connected to the power supply 32, the driving power is applied, so that the clock is independent of the ON / OFF of the power switches 33a, 33b,. Three
.., 31n can keep the current time signal and can always supply the current time signal to each electric device. Therefore, each electric device can realize a timer function of turning on / off the drive power supply 32 at a preset time in the storage means (RAM) 34a, 34b,... 34n using the time signal. it can.

【0003】[0003]

【発明が解決しようとする課題】しかしながら上述した
ような従来の電気機器(家電機器)においては以下に示
すような二つの問題点があった。つまり、家電機器の電
源スイッチ33a、33b、・・・・・・33nがOFFであっても電
源コンセントに接続した状態では、途切れることなく正
確な時刻を刻みつづけられるように内蔵の時計は常に動
作し電力を消費してしまう。また前記内蔵の時計で電力
を消費させないよう家電機器の駆動電源32の電源ケ−ブ
ルを電源コンセントから抜き省エネを図ったとしても、
電気機器内部の時刻情報と共に記憶手段(RAM)に保
存された動作設定情報(ビデオの場合はチャンネル設定
情報等、エアコンの場合は温度設定情報等)までもが消
失してしまい、電気機器の電源を再度ONとしたときに
は、時刻情報の再設定及び動作設定情報を再設定しなけ
ればならないという問題があった。本発明は、上述した
従来の家電機器の問題を同時に解決するためになされた
もので、電気機器内部の時計で不必要に電力を消費する
ことを防止し、かつ電気機器の動作設定情報を外部記憶
手段に転送、記憶させることで電気機器の電源をOFF
としたとき電気機器の動作設定情報が消失するのを防止
するとともに電気機器の電源をONとしたとき時刻信号
を外部から電気機器に供給し、その結果電気機器の動作
設定情報の再入力及び時刻合わせを不要とすることがで
きる節電システムを供給することを目的とする。
However, the above-mentioned conventional electric appliances (home electric appliances) have the following two problems. In other words, even when the power switches 33a, 33b,... 33n of the home appliances are OFF, the built-in clock always operates so that the time can be kept accurate without interruption when connected to the power outlet. Consumes power. Further, even if the power cable of the drive power supply 32 of the home electric appliance is disconnected from the power outlet so as not to consume power by the built-in clock, energy saving is achieved.
The operation setting information (such as channel setting information in the case of video, temperature setting information in the case of an air conditioner, etc.) stored in the storage means (RAM) together with the time information inside the electric device is lost, and the power supply of the electric device is lost. Is turned on again, there is a problem that the time information and the operation setting information must be reset. The present invention has been made to solve the above-described problems of the conventional home electric appliances at the same time, and prevents unnecessary consumption of power by a clock inside the electric appliance, and stores operation setting information of the electric appliance to an external device. Turn off the power of electrical equipment by transferring and storing in storage means
When the power setting of the electric device is turned on, a time signal is supplied from the outside to the electric device, and as a result, the operation setting information of the electric device is re-input and the time is set. An object is to provide a power saving system that can eliminate the need for alignment.

【0004】[0004]

【課題を解決しようとする手段】上記目的を解決するた
めに、本発明に係わる節電システムの請求項1記載の発
明は、複数の電気機器の電源線と電源との接続を選択的
に切り換える切換手段と、制御手段と、時計手段と、記
憶手段とを備えるように構成する。本発明に係わる節電
システムの請求項2記載の発明は、請求項1記載の節電シ
ステムにおいて、各電気機器の電源ON/OFFを設定
するための入力手段を少なくとも一つ備える様に構成す
る。
In order to solve the above-mentioned object, according to the present invention, there is provided a power saving system according to the present invention, which comprises a switch for selectively switching a connection between a power supply line of a plurality of electric devices and a power supply. Means, control means, clock means, and storage means. According to a second aspect of the power saving system according to the present invention, in the power saving system according to the first aspect, at least one input unit for setting power ON / OFF of each electric device is provided.

【0005】[0005]

【発明の実施の形態】以下、図示したした実施の形態例
に基づいて本発明を詳細に説明する。図1は本発明に係
わる電気機器の節電システムの形態例を示す機能ブロッ
ク図である。この例に示す電気機器の節電システムは、
複数の電気機器1a、1b、・・・・1nを集中コントロ−ル装置
6を介して電源32に接続し、他方の端子を電気機器1a、1
b、・・・・1nにそれぞれ接続したスイッチSW1、SW2、・・・・・・
・・SWnを備えた切換手段2と、前記電源32より直接駆動さ
れる時計4と、該時計4の出力する時刻信号に基づき各電
気機器に対して時刻合わせを実施すると共に各電気機器
の動作再設定を実施する制御手段3と、該制御手段3に各
電気機器の電源ON/OFF信号を入力するための入力
手段7とを備えている。また電気機器1a、1b、・・・1nは、
いずれも前記制御手段3と通信線8を介して接続されてい
る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIG. 1 is a functional block diagram showing an example of an embodiment of a power saving system of an electric device according to the present invention. The power saving system for electrical equipment shown in this example is
Centralized control device for multiple electrical devices 1a, 1b, ... 1n
6 and a power supply 32, and the other terminals are connected to the electric devices 1a and 1a.
b,... switches SW1, SW2,.
..Switching means 2 having SWn, clock 4 directly driven by power supply 32, and time adjustment for each electric device based on the time signal output from clock 4, and operation of each electric device The control unit 3 includes a control unit 3 for performing resetting, and an input unit 7 for inputting a power ON / OFF signal of each electric device to the control unit 3. The electric devices 1a, 1b, ... 1n are
Each of them is connected to the control means 3 via a communication line 8.

【0006】この例に示す節電システムは以下の様に機
能する。なおここでは各電気機器の電源のON/OFF
を実施する場合について説明する。即ち、キ−ボ−ドな
どの入力手段7を用いて制御手段3に電気機器1a、1b、・・
・1nそれぞれの電源ON/OFFの設定信号を入力す
る。例えば電気機器1aの電源をOFFとする設定信号を
入力手段7を用いて入力すると、前記制御手段3は通信線
8を介して電気機器1a内部のRAM11aから動作設定情報
を読み出し記憶手段5に転送し記憶する。前記記憶手段5
に前記電気機器1aの動作設定情報が記憶されると、前記
制御手段3は切換手段2にSW1、SW2、・・・SWnを切り
換える切換信号を送信し、例えばSW1をOFF、SW
2、SW3、・・・SWnをONとすることで電気機器1aに供
給する電源を停止させ、電気機器1aに対する制御を終了
する。また再度電気機器1aに電源を供給し動作させる場
合は、入力手段7を用いて電源をONとする設定信号を
前記制御手段3に入力する。そして、制御手段3は、前記
切換手段2に切換信号を送信し、SW1をONとすると共
に、通信線8を介して記憶手段5に保存された電気機器1a
の動作設定情報を電気機器1aに供給する。また制御手段
3は時計4から入力される時刻情報を基に通信線8を介し
て時刻合わせの制御信号を電気機器1aに内蔵された時計
10aに供給する。このように、電気機器1aの電源をON
としたときに電気機器1aの動作設定情報の再設定及び時
計10aの時刻合わせを手動で行う操作は不要となる。な
お、他の電気機器1b、1c・・・1nについても、集中コント
ロール装置6は上述した電気機器1aに対する制御例と同
様に、前記電気機器1bに対しても動作設定情報の再設定
機能及び時刻合わせ機能のための制御を実施することが
できる。
The power saving system shown in this example functions as follows. In addition, here, ON / OFF of the power supply of each electric equipment
Will be described. That is, the electric devices 1a, 1b,... Are input to the control means 3 using the input means 7 such as a keyboard.
・ Input the power ON / OFF setting signal for each 1n. For example, when a setting signal for turning off the power of the electric device 1a is input using the input means 7, the control means 3
The operation setting information is read out from the RAM 11a inside the electric device 1a via 8 and transferred to the storage means 5 for storage. The storage means 5
When the operation setting information of the electric device 1a is stored in the control unit 3, the control unit 3 transmits a switching signal for switching SW1, SW2,.
By turning on SW3,... SWn, the power supply to the electric device 1a is stopped, and the control for the electric device 1a is ended. When the power is again supplied to the electric device 1a to operate the electric device 1a, a setting signal for turning on the power is input to the control unit 3 using the input unit 7. Then, the control means 3 transmits a switching signal to the switching means 2 to turn on SW 1, and the electric device 1 a stored in the storage means 5 via the communication line 8.
Is supplied to the electric device 1a. Control means
Reference numeral 3 denotes a clock built in the electric device 1a which transmits a time adjustment control signal through the communication line 8 based on the time information input from the clock 4.
Supply 10a. Thus, the power of the electric device 1a is turned on.
In this case, the operation of manually resetting the operation setting information of the electric device 1a and manually adjusting the time of the clock 10a becomes unnecessary. Note that, for the other electric devices 1b, 1c,..., 1n as well, the central control device 6 performs the resetting function of the operation setting information and the time for the electric device 1b as in the control example for the electric device 1a described above. Control for the matching function can be performed.

【0007】以上の様に本発明に係わる電気機器の節電
システムは、集中コントロール装置6によって、それぞ
れの電気機器の電源のON/OFFを制御することがで
きるので各電気機器内部の時計が不必要に電力を消費す
ることを防止できる。また、集中コントロ−ル装置6が
時計4及び記憶手段5を備えることでそれぞの電気機器の
電源をOFFにしたとき動作設定情報及び時刻情報が消
失するのを防止し、電気機器の電源をONとしたときの
時刻合わせの再設定および動作の再設定を不要とするこ
とができる。
As described above, in the power saving system for electric equipment according to the present invention, the central control device 6 can control ON / OFF of the power of each electric equipment, so that the clock inside each electric equipment is unnecessary. Power consumption can be prevented. Further, the central control device 6 is provided with the clock 4 and the storage means 5 to prevent the operation setting information and the time information from being lost when the power of each electric device is turned off, and to turn off the power of the electric device. It is not necessary to reset the time setting and the operation when the switch is turned on.

【0008】以上説明した本発明の実施の形態において
は、集中コントロ−ル装置6に接続する入力手段7をただ
一つ備える構成となっているが、本発明の実施はこの例
に限らず、例えば図2の様に入力手段を複数個備えた構
成にしてもよい。この場合、入力手段12a、12b、・・・12n
はそれぞれ電気機器1a、1b、・・・1nの設置された場所付
近において通信線8に接続される。前記入力手段12a、12
b、・・・12nから通信線8を介して制御手段3に電気機器1
a、1b、・・・1nの電源ON/OFF設定信号を入力する
と、制御手段3は前記時計からの時刻情報に基づき時刻
合わせ信号を通信線8を介し各電気機器に供給すると共
に、前記記憶手段からの動作設定情報を通信線8を介し
て各電気機器に供給する。このように、各電気機器の設
置場所が集中コントロール装置の設置場所からかなり離
れていても、各電気機器の設置場所のどこか近くにいれ
ば、集中コントロ−ル装置の設置場所まで行かなくとも
集中コントロール装置の入力手段7と同様に各電気機器
の電源をON/OFFすることができ、また時刻合わせ
の再設定及び動作の再設定を不要とすることができる利
点がある。
In the embodiment of the present invention described above, only one input means 7 connected to the central control device 6 is provided. However, the present invention is not limited to this example. For example, a configuration provided with a plurality of input means as shown in FIG. In this case, the input means 12a, 12b, ... 12n
Are connected to the communication line 8 near the places where the electric devices 1a, 1b,. The input means 12a, 12
b,... 12n to the control means 3 via the communication line 8 to the electric device 1
When the power ON / OFF setting signals of a, 1b,... 1n are input, the control means 3 supplies a time adjustment signal to each electric device via the communication line 8 based on the time information from the clock, and stores the memory. The operation setting information from the means is supplied to each electric device via the communication line 8. In this way, even if the installation location of each electrical equipment is considerably far from the installation location of the central control device, if it is located somewhere near the installation location of each electrical equipment, it is not necessary to go to the installation location of the central control device. As with the input means 7 of the centralized control device, there is an advantage that the power of each electric device can be turned on / off, and that the resetting of the time adjustment and the resetting of the operation are not required.

【0009】また、電源32を供給する電源線9と制御信
号を供給する通信線8とをそれぞれ別個に設ける構成と
したが、本発明の実施にあたたってはこの例に限らず、
例えば集中コントロール装置6と複数の電気機器1a、1
b、・・・1n間の通信線8を電源線9が兼用できる電力線通信
方式にすれば、集中コントロール装置7と複数の電気機
器1a、1b、・・・1n間の通信線9の配線を不要とすることが
できる利点がある。ここで、電力線通信方式は周知のよ
うに信号をスペクトラム拡散した後に電源線9に重畳
し、信号と電源とを一本の線路で伝送するように構成し
たものである。なお説明が複雑になるので詳細な説明は
省略する。
Although the power supply line 9 for supplying the power supply 32 and the communication line 8 for supplying the control signal are separately provided, the present invention is not limited to this example.
For example, a central control device 6 and a plurality of electric devices 1a, 1
If the communication line 8 between b,... 1n is a power line communication system in which the power line 9 can also be used, the wiring of the communication line 9 between the central control device 7 and the plurality of electric devices 1a, 1b,. There are advantages that can be made unnecessary. Here, as is well known, the power line communication system is configured such that a signal is spread and then superimposed on the power supply line 9 to transmit the signal and the power supply through one line. Since the description is complicated, detailed description is omitted.

【0010】[0010]

【発明の効果】本発明は以上説明したように時計及び記
憶手段を備える集中コントロール装置を用いて複数の電
気機器の電源のON/OFFを制御し、複数の電気機器
の動作設定情報を集中コントロール装置に記憶保存する
ことができ、また動作設定信号と共に時刻合わせ信号を
各電気機器に供給できるように構成したので、従来複数
の電気機器が電源に接続された状態でも内蔵の時計が不
必要に消費していた電力を節電できると共に各電気機器
の電源をONとする度に必要であった動作設定情報の再
設定および時刻合わせの再設定の操作を不要にできる効
果がある。
According to the present invention, as described above, the ON / OFF of the power of a plurality of electric devices is controlled using the centralized control device having a clock and a storage means, and the operation setting information of the plurality of electric devices is centrally controlled. The device can be stored and stored, and the time setting signal can be supplied to each electric device together with the operation setting signal. Therefore, even if several electric devices are connected to the power source, the built-in clock is unnecessary. This has the effect of saving power consumption and eliminating the need for resetting the operation setting information and resetting the time adjustment each time the power of each electric device is turned on.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係わる電気機器の節電システムの第1
の実施の形態例を示す機能ブロック図
FIG. 1 is a diagram showing a first embodiment of a power saving system for electric equipment according to the present invention
Functional block diagram showing an embodiment of the present invention

【図2】本発明に係わる電気機器の節電システムの第2
の実施の形態例を示す機能ブロック図
FIG. 2 is a second view of the power saving system for electric equipment according to the present invention.
Functional block diagram showing an embodiment of the present invention

【図3】従来の家庭内に配置される電気機器の構成例を
示す機能ブロック図
FIG. 3 is a functional block diagram showing a configuration example of a conventional electric device arranged in a home.

【符号の説明】[Explanation of symbols]

1a、1b、・・・1n・・電気機器 2・・切換手段 3・・制御手段 4・・時計 5・・記憶手段 6・・集中コントロール装置 7・・入力手段 8・・通信線 9・・・電源線 10a、10b、・・・10n・・時計 11a、11b、・・・11n・・RAM 30a、30b、・・・30n・・電気機器 31a、31b、・・・31n・・時計 32・・電源AC100V 33a、33b、・・・33n・・電源スイッチ 34a、34b、・・・34n・・RAM 1a, 1b, ... 1n ... Electrical equipment 2 ... Switching means 3 ... Control means 4 ... Clock 5 ... Storage means 6 ... Central control device 7 ... Input means 8 ... Communication line 9 ...・ Power supply lines 10a, 10b, ... 10n ・ ・ Clock 11a, 11b, ・ ・ ・ 11n ・ ・ RAM 30a, 30b, ・ ・ ・ 30n ・ ・ Electric equipment 31a, 31b, ・ ・ ・ 31n ・ ・ Clock 32 ・・ Power supply AC100V 33a, 33b, ... 33n ・ ・ Power switch 34a, 34b, ... 34n ・ ・ RAM

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 複数の電気機器の電源線と電源との接続
を選択的に切り換えるための切換手段と、制御手段と、
時計手段と、記憶手段とを備えた節電システムであっ
て、前記制御手段は予め設定された電源ON/OFF設
定情報と前記時計手段手段からの時刻信号と前記記憶手
段からの電気機器設定情報に基づいて、前記切換手段を
制御するための切換制御信号と前記各電気機器内部の時
計の時刻合わせをするための時刻信号と前記各電気機器
の動作設定信号とをそれぞれ生成し、前記切換信号を前
記切換手段に供給すると共に、前記時刻信号と前記電気
機器設定信号を通信線を介して前記各電気機器に供給
し、また前記各電気機器内部に記憶された動作設定情報
を通信線を介して前記記憶手段に転送し記憶させること
で前記各電気機器の電源をOFFとしたときに各電気機
器の動作設定情報及び時刻情報が消失するのを防止した
ことを特徴とする電気機器の節電システム。
A switching unit for selectively switching a connection between a power supply line of a plurality of electric devices and a power supply; a control unit;
A power saving system comprising a clock unit and a storage unit, wherein the control unit stores in advance power ON / OFF setting information, a time signal from the clock unit, and electric device setting information from the storage unit. A switching signal for controlling the switching means, a time signal for adjusting the time of a clock in each of the electric devices, and an operation setting signal for each of the electric devices, respectively, and generating the switching signal. Along with supplying to the switching means, the time signal and the electric device setting signal are supplied to each electric device via a communication line, and operation setting information stored inside each electric device is transmitted via a communication line. By transferring and storing in the storage means, the operation setting information and time information of each electric device are prevented from being lost when the power of each electric device is turned off. Vessel power-saving system of.
【請求項2】 前記制御情報を設定するための入力手段
を少なくとも一つ備えたことを特徴とする請求項1記載
の電気機器の節電システム。
2. The power saving system for an electric device according to claim 1, further comprising at least one input unit for setting the control information.
JP17502399A 1999-06-22 1999-06-22 Power saving system for electrical equipment Pending JP2001008361A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17502399A JP2001008361A (en) 1999-06-22 1999-06-22 Power saving system for electrical equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17502399A JP2001008361A (en) 1999-06-22 1999-06-22 Power saving system for electrical equipment

Publications (1)

Publication Number Publication Date
JP2001008361A true JP2001008361A (en) 2001-01-12

Family

ID=15988875

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17502399A Pending JP2001008361A (en) 1999-06-22 1999-06-22 Power saving system for electrical equipment

Country Status (1)

Country Link
JP (1) JP2001008361A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100445789B1 (en) * 2002-01-16 2004-08-30 엘지에프에이(주) Digital Timer and Driving Method therefor
JP2009169549A (en) * 2008-01-11 2009-07-30 Tokyo Electric Power Co Inc:The Supply power control system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100445789B1 (en) * 2002-01-16 2004-08-30 엘지에프에이(주) Digital Timer and Driving Method therefor
JP2009169549A (en) * 2008-01-11 2009-07-30 Tokyo Electric Power Co Inc:The Supply power control system and method

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