JP4513519B2 - Uninterruptible power system - Google Patents

Uninterruptible power system Download PDF

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JP4513519B2
JP4513519B2 JP2004330031A JP2004330031A JP4513519B2 JP 4513519 B2 JP4513519 B2 JP 4513519B2 JP 2004330031 A JP2004330031 A JP 2004330031A JP 2004330031 A JP2004330031 A JP 2004330031A JP 4513519 B2 JP4513519 B2 JP 4513519B2
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storage battery
power
voltage
charging circuit
switching element
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JP2006141165A (en
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理 橋元
寛和 徳田
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Fuji Electric Co Ltd
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Fuji Electric Systems Co Ltd
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Description

本発明は、停電時に蓄電池からの直流電力を供給する無停電電源装置に関する。   The present invention relates to an uninterruptible power supply that supplies DC power from a storage battery during a power failure.

図３は従来の蓄電池及びその充電回路を備えた無停電電源装置の回路構成図である。
この無停電電源装置は、交流電源１からの交流電力を直流中間充電器２により直流電力に変換し、コンデンサＣ１で平滑した後、更にインバータ３により交流電力に再変換して負荷４に供給するもので、停電時の対策として蓄電池６及びその充電回路７を備えており、停電時には開閉素子９をオン（ＯＮ）にして蓄電池６からの直流電力を直流変換器５を介して直流中間充電器２とインバータ３の間に供給している。 FIG. 3 is a circuit configuration diagram of an uninterruptible power supply device provided with a conventional storage battery and its charging circuit.
In this uninterruptible power supply, AC power from the AC power source 1 is converted into DC power by the DC intermediate charger 2, smoothed by the capacitor C1, and then converted again to AC power by the inverter 3 and supplied to the load 4. The battery 6 and its charging circuit 7 are provided as a countermeasure in the event of a power failure, the switching element 9 is turned on (ON) in the event of a power failure, and the DC power from the storage battery 6 is passed through the DC converter 5 to the DC intermediate charger. 2 and the inverter 3.

また、蓄電池６からの電源ラインには平滑用のコンデンサＣ２が接続されている。更に、蓄電池６及び充電回路７側の異常を検知するために、開閉素子９の充電回路７側の電圧を検出する電圧検出回路１０と、開閉素子９の蓄電池６側の電圧を検出する電圧検出回路１２が設けられている。   Further, a smoothing capacitor C <b> 2 is connected to the power supply line from the storage battery 6. Furthermore, in order to detect an abnormality on the storage battery 6 and the charging circuit 7 side, a voltage detection circuit 10 for detecting the voltage on the charging circuit 7 side of the switching element 9 and a voltage detection for detecting the voltage on the storage battery 6 side of the switching element 9 A circuit 12 is provided.

上記のように構成された無停電電源装置においては、直流中間充電器２からの直流電力だけでは電力が不足する場合でも、蓄電池６からの直流電力が直流変換器５を介して供給されるので、負荷４は停電することなく、運転を継続することができる。また、蓄電池６を装置本体から切り離す（電気的に遮断する）ための開閉素子９が、次の（ａ）、（ｂ）の理由により設けられている。   In the uninterruptible power supply configured as described above, even when the DC power from the DC intermediate charger 2 alone is insufficient, DC power from the storage battery 6 is supplied via the DC converter 5. The load 4 can continue operation without power failure. In addition, an opening / closing element 9 for separating (electrically blocking) the storage battery 6 from the apparatus main body is provided for the following reasons (a) and (b).

（ａ）蓄電池６には大電力が蓄積されており、装置本体側に異常が発生した場合に、発火防止等のために蓄電池６を装置本体と切り離さなければならない。
（ｂ）蓄電池６には寿命があり、定期的に蓄電池６を装置本体から切り離して交換しなければならない。 (A) A large amount of electric power is stored in the storage battery 6, and when an abnormality occurs on the apparatus main body side, the storage battery 6 must be disconnected from the apparatus main body in order to prevent ignition.
(B) The storage battery 6 has a lifetime, and the storage battery 6 must be periodically disconnected from the apparatus main body and replaced.

また、上記のような無停電電源装置として、バッテリ用ブレーカがオフ（ＯＦＦ）のまま使用しようとしたときに警報を発するようにした無停電電源装置も提案されている（例えば特許文献１参照）。
特開平８−１９１５４９号公報 In addition, as an uninterruptible power supply device as described above, an uninterruptible power supply device has also been proposed in which an alarm is issued when an attempt is made to use the battery breaker while it is off (see, for example, Patent Document 1). .
JP-A-8-191549

ところで、上記のような従来の無停電電源装置では、開閉素子９がオン（導通）している間、開閉素子９の両側に備えられた充電回路７側の電圧検出回路１０と蓄電池６側の電圧検出回路１２の検出電圧は同じ電圧になるため、仮に蓄電池６または充電回路７とコンデンサＣ２に異常が発生した場合には、開閉素子９をオフ（遮断）し、電圧検出回路１０と電圧検出回路１２の検出電圧により異常が発生した場所を特定する必要がある。   By the way, in the conventional uninterruptible power supply as described above, while the switching element 9 is on (conductive), the voltage detection circuit 10 on the charging circuit 7 side and the storage battery 6 side provided on both sides of the switching element 9 are provided. Since the detection voltage of the voltage detection circuit 12 is the same voltage, if an abnormality occurs in the storage battery 6 or the charging circuit 7 and the capacitor C2, the switching element 9 is turned off (cut off), and the voltage detection circuit 10 and the voltage detection are detected. It is necessary to specify the place where the abnormality has occurred by the detection voltage of the circuit 12.

しかし、異常が発生していない場合は上記のように電圧検出回路１０と電圧検出回路１２の検出電圧は同じ電圧であり、開閉素子９で接続された同電位のライン電圧を検出しているため、構成部品が重複し、コスト的にも無駄が生じてしまうという問題点があった。   However, when no abnormality has occurred, the detection voltages of the voltage detection circuit 10 and the voltage detection circuit 12 are the same as described above, and the line voltage of the same potential connected by the switching element 9 is detected. However, there is a problem in that the component parts are duplicated and the cost is wasted.

本発明はこのような点に鑑みてなされたものであり、少ない構成部品で蓄電池及び充電回路側の異常の発生箇所を特定でき、コスト的にも無駄のない無停電電源装置を提供することを目的とする。   This invention is made in view of such a point, and can provide the uninterruptible power supply apparatus which can pinpoint the abnormality occurrence location by the side of a storage battery and a charging circuit with few components, and is also useless also in cost. Objective.

本発明では上記課題を解決するために、停電時に蓄電池からの直流電力を所望の電圧に変換して供給する無停電電源装置であって、前記蓄電池を遮断するための開閉素子と、前記蓄電池に前記開閉素子を介して接続された充電回路と、前記開閉素子の前記充電回路側の電圧を検出する電圧検出回路と、前記蓄電池に前記開閉素子を介して並列接続されたコンデンサ及びその放電回路と、を備え、前記開閉素子を操作して前記蓄電池または前記充電回路の異常検知、および前記充電回路の動作を停止して前記蓄電池の未接続検知を実行するようにしたことを特徴とする無停電電源装置が提供される。 In the present invention, in order to solve the above-described problem, an uninterruptible power supply device that converts and supplies DC power from a storage battery to a desired voltage at the time of a power failure, the switch element for shutting off the storage battery, and the storage battery a charging circuit connected via the switching element, a voltage detection circuit for detecting the charging circuit side of the voltage of the switching element, a capacitor and a discharge circuit connected in parallel via the switching element to the battery And operating the opening / closing element to detect abnormality of the storage battery or the charging circuit, and to stop the operation of the charging circuit and to detect the unconnected state of the storage battery. A power supply is provided.

このような無停電電源装置によれば、開閉素子の蓄電池側の電圧検出回路を省くことができ、少ない構成部品で蓄電池及び充電回路側の異常の発生箇所を特定でき、コスト的にも無駄のないものとなる。また、蓄電池の未接続を検知することができる。 According to such an uninterruptible power supply device, the voltage detection circuit on the storage battery side of the switching element can be omitted, the occurrence location of the abnormality on the storage battery and charging circuit side can be specified with a small number of components, and wasteful in terms of cost. It will not be. Moreover, the unconnected state of the storage battery can be detected.

また本発明では、停電時に蓄電池からの直流電力を所望の交流電圧に変換して負荷に供給する無停電電源装置であって、交流電力を直流電力に変換する第１の電力変換手段と、変換された直流電力を交流電力に変換する第２の電力変換手段と、前記蓄電池からの直流電力を所望の電圧に変換して前記第２の電力変換手段に供給する第３の電力変換手段と、前記蓄電池を遮断するための開閉素子と、前記蓄電池に前記開閉素子を介して接続された充電回路と、前記蓄電池に前記開閉素子を介して並列接続されたコンデンサ及びその放電回路と、前記開閉素子の前記コンデンサ側の電圧を検出する電圧検出回路とを備え、前記開閉素子を操作して前記蓄電池または前記充電回路の異常検知、および前記充電回路の動作を停止して前記蓄電池の未接続検知を実行するようにしたことを特徴とする無停電電源装置が提供される。
According to the present invention, there is also an uninterruptible power supply device that converts DC power from a storage battery into a desired AC voltage and supplies it to a load at the time of a power failure, and includes a first power conversion unit that converts AC power into DC power, Second power conversion means for converting the direct-current power to AC power; third power conversion means for converting the direct-current power from the storage battery into a desired voltage and supplying the second power conversion means; and switching element for blocking the battery, the charging circuit which is connected via the switching element to the battery, a capacitor and a discharge circuit connected in parallel via the switching element to the battery, the switching element a of the capacitor-side voltage detecting circuit that detects a voltage of, anomaly detection, and stops the operation of the charging circuit non contact of the battery of the battery or the charging circuit by operating the switching element The uninterruptible power supply is provided which is characterized in that so as to perform the detection.

本発明の無停電電源装置は、開閉素子の充電回路側の電圧を検出する電圧検出回路を備えたので、開閉素子の蓄電池側の電圧検出回路を省くことができ、少ない構成部品で蓄電池及び充電回路側の異常の発生箇所を特定でき、コストを低減できる。   Since the uninterruptible power supply device of the present invention includes a voltage detection circuit for detecting the voltage on the charging circuit side of the switching element, the voltage detection circuit on the storage battery side of the switching element can be omitted, and the storage battery and charging can be performed with fewer components. It is possible to identify the location where an abnormality has occurred on the circuit side and reduce the cost.

以下、本発明の実施の形態を図面を参照して説明する。
図１は本発明の実施の形態の無停電電源装置の回路構成図である。なお、図３と同一構成部分には同一符号を付して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit configuration diagram of an uninterruptible power supply according to an embodiment of the present invention. In addition, the same code | symbol is attached | subjected and demonstrated to the same component as FIG.

図１において、１は交流電源、２は交流電源１からの交流電力を直流電力に変換する直流中間充電器（第１の電力変換手段）、３は変換された直流電力を交流電力に変換して負荷４に供給するインバータ（第２の電力変換手段）で、直流中間充電器２との間の直流中間には平滑用のコンデンサＣ１が接続されている。５は蓄電池６からの直流電力を所望の電圧に変換してインバータ３に供給するチョッパ等の直流変換器（第３の電力変換手段）、７は蓄電池６を充電する充電回路で、蓄電池６からの電源ラインにはコンデンサＣ２とその放電回路８が設けられている。９は蓄電池６を遮断するための開閉素子で、蓄電池６にはこの開閉素子９を介してコンデンサＣ２及びその放電回路８が並列接続されている。１０は開閉素子９のコンデンサＣ２側の電圧を検出する電圧検出回路で、開閉素子９の蓄電池６側の電圧を検出する電圧検出回路は設けられていない。   In FIG. 1, 1 is an AC power source, 2 is a DC intermediate charger (first power conversion means) that converts AC power from the AC power source 1 into DC power, and 3 is a converter that converts the converted DC power into AC power. A smoothing capacitor C <b> 1 is connected to the DC intermediate between the DC intermediate charger 2 and the inverter (second power conversion means) supplied to the load 4. Reference numeral 5 denotes a DC converter (third power conversion means) such as a chopper that converts DC power from the storage battery 6 into a desired voltage and supplies it to the inverter 3. Reference numeral 7 denotes a charging circuit that charges the storage battery 6. The power supply line is provided with a capacitor C2 and its discharge circuit 8. Reference numeral 9 denotes an opening / closing element for shutting off the storage battery 6, and a capacitor C 2 and its discharge circuit 8 are connected in parallel to the storage battery 6 via the opening / closing element 9. Reference numeral 10 denotes a voltage detection circuit for detecting the voltage on the capacitor C2 side of the switching element 9, and no voltage detection circuit for detecting the voltage on the storage battery 6 side of the switching element 9 is provided.

上記のように構成された無停電電源装置においては、インバータ３から所望の電圧と周波数の交流電力が出力されて負荷４に供給されるが、前述のように直流中間充電器２からの直流電力だけでは電力不足になるときには、蓄電池６からの直流電力が直流変換器５で所望の電圧の直流電力に変換され、この直流電力がインバータ３を介して負荷４に供給されるので、負荷４は停電することなく、運転を継続することができる。   In the uninterruptible power supply configured as described above, AC power having a desired voltage and frequency is output from the inverter 3 and supplied to the load 4. As described above, the DC power from the DC intermediate charger 2 is output. When the power becomes insufficient, the DC power from the storage battery 6 is converted into DC power of a desired voltage by the DC converter 5 and this DC power is supplied to the load 4 via the inverter 3. Operation can be continued without power failure.

また、蓄電池６はコンデンサＣ２が接続された状態で充電回路７により充電が行われる。いま、蓄電池６または充電回路７に異常が発生した場合は、まず開閉素子９をオフにし、充電回路７を動作させる。このとき、蓄電池６に異常が発生したと仮定すると、開閉素子９をオフにして充電回路７を動作させたことで、電圧検出回路１０は異常ではない電圧を検出する。これにより、蓄電池６に異常が発生していると判断する。また、充電回路７に異常が発生したと仮定すると、開閉素子９をオフにして放電回路８によりコンデンサＣ２に蓄積された電力が放電されることによって、電圧検出回路１０は異常な電圧を検出する。これにより、充電回路７に異常が発生したと判断することができる。
Also, the storage battery 6 is charged by the charging circuit 7 in a state where the capacitor C2 is connected. Now, if the abnormality in the battery 6 or the charging circuit 7 is generated, the switching element 9 turns off first, operates the charging circuit 7. Assuming that an abnormality has occurred in the storage battery 6 at this time, the voltage detection circuit 10 detects a voltage that is not abnormal by turning off the switching element 9 and operating the charging circuit 7 . Thereby , it is determined that an abnormality has occurred in the storage battery 6. Assuming that an abnormality has occurred in the charging circuit 7, the voltage detection circuit 10 detects an abnormal voltage by turning off the switching element 9 and discharging the electric power stored in the capacitor C2 by the discharging circuit 8. . Thereby , it can be determined that an abnormality has occurred in the charging circuit 7.

次に、装置運転開始の際に、蓄電池６の未接続を検知するには、まず開閉素子９をオフにしておき、充電回路７を動作させる。そして、充電回路７の動作を中止し、開閉素子９をオンにする。このとき、仮に蓄電池６が未接続の場合は、コンデンサＣ２に蓄積された電力が放電回路８により放電されることで、電圧検出回路１０は異常な電圧を検出することにより、蓄電池６が未接続であると判断することができる。   Next, in order to detect the unconnected state of the storage battery 6 at the start of the operation of the apparatus, the switching element 9 is first turned off and the charging circuit 7 is operated. Then, the operation of the charging circuit 7 is stopped, and the switching element 9 is turned on. At this time, if the storage battery 6 is not connected, the power stored in the capacitor C2 is discharged by the discharge circuit 8, and the voltage detection circuit 10 detects an abnormal voltage, so that the storage battery 6 is not connected. Can be determined.

このような制御により、蓄電池６側の電圧検出回路を省くことができ、少ない構成部品で蓄電池６及び充電回路７側の異常の発生箇所を特定でき、コスト的にも無駄のないものとなる。更に、蓄電池６の未接続も検知することができる。   By such control, the voltage detection circuit on the side of the storage battery 6 can be omitted, the location where the abnormality occurs on the side of the storage battery 6 and the charging circuit 7 can be specified with a small number of components, and there is no waste in terms of cost. Furthermore, the unconnected state of the storage battery 6 can also be detected.

次に、図２の回路構成図を参照しながら上述の異常検知及び蓄電池６の未接続検知の制御動作について説明する。図２は図１の要部を示す図であり、開閉素子としてリレー１１を設けた例を示している。   Next, the above-described abnormality detection and non-connection detection control operation of the storage battery 6 will be described with reference to the circuit configuration diagram of FIG. FIG. 2 is a diagram showing a main part of FIG. 1 and shows an example in which a relay 11 is provided as an opening / closing element.

（１）まず、蓄電池６が過電圧であった場合、電圧検出回路１０は過電圧を検出する。そして、リレー１１を遮断し、充電回路７を動作させると、電圧検出回路１０の検出値は正常な充電回路７の電圧で安定するため、過電圧が解除される。これにより、蓄電池６が過電圧であると判断することができる。   (1) First, when the storage battery 6 is overvoltage, the voltage detection circuit 10 detects overvoltage. When the relay 11 is cut off and the charging circuit 7 is operated, the detection value of the voltage detection circuit 10 is stabilized at the normal voltage of the charging circuit 7, so that the overvoltage is released. Thereby, it can be judged that the storage battery 6 is overvoltage.

（２）また、蓄電池６が低電圧であった場合、電圧検出回路１０は低電圧を検出する。そして、リレー１１を遮断し、充電回路７を動作させると、電圧検出回路１０の検出値は正常な充電回路７の電圧で安定するため、低電圧が解除される。これにより、蓄電池６が低電圧であると判断することができる。   (2) When the storage battery 6 has a low voltage, the voltage detection circuit 10 detects the low voltage. When the relay 11 is cut off and the charging circuit 7 is operated, the detection value of the voltage detection circuit 10 is stabilized at the normal voltage of the charging circuit 7, so that the low voltage is released. Thereby, it can be judged that the storage battery 6 is a low voltage.

（３）次に、充電回路７が過電圧であった場合、電圧検出回路１０は過電圧を検出する。そして、リレー１１を遮断し、充電回路７を動作させると、電圧検出回路１０は過電圧を検出したままとなる。これにより、充電回路７が過電圧であると判断することができる。   (3) Next, when the charging circuit 7 is overvoltage, the voltage detection circuit 10 detects overvoltage. And if the relay 11 is interrupted | blocked and the charging circuit 7 is operated, the voltage detection circuit 10 will remain detecting the overvoltage. Thereby, it can be determined that the charging circuit 7 is overvoltage.

（４）また、充電回路７が低電圧であった場合、電圧検出回路１０は低電圧を検出する。そして、リレー１１を遮断し、充電回路７を動作させると、電圧検出回路１０は低電圧を検出したままとなる。これにより、充電回路７が低電圧であると判断することができる。   (4) When the charging circuit 7 has a low voltage, the voltage detection circuit 10 detects the low voltage. Then, when the relay 11 is cut off and the charging circuit 7 is operated, the voltage detection circuit 10 remains to detect the low voltage. Thereby, it can be determined that the charging circuit 7 has a low voltage.

（５）そして、蓄電池６が未接続であった場合、リレー１１を導通した状態で充電回路７の動作を停止させると、充電回路７によりコンデンサＣ２に充電されていた電力が放電回路８によって放電され、電圧検出回路１０は低電圧を検出する。これにより、蓄電池６が接続されていないと判断することができる。   (5) When the storage battery 6 is not connected, when the operation of the charging circuit 7 is stopped while the relay 11 is turned on, the power charged in the capacitor C2 by the charging circuit 7 is discharged by the discharging circuit 8. The voltage detection circuit 10 detects a low voltage. Thereby, it can be judged that the storage battery 6 is not connected.

本発明の実施の形態の無停電電源装置の回路構成図である。It is a circuit block diagram of the uninterruptible power supply of an embodiment of the invention. 本発明の実施の形態の無停電電源装置の要部を示す回路構成図である。It is a circuit block diagram which shows the principal part of the uninterruptible power supply of embodiment of this invention. 従来の無停電電源装置の回路構成図である。It is a circuit block diagram of the conventional uninterruptible power supply.

符号の説明Explanation of symbols

１ 交流電源
２ 直流中間充電器
３ インバータ
４ 負荷
５ 直流変換器
６ 蓄電池
７ 充電回路
８ 放電回路
９ 開閉素子
１０，１２ 電圧検出回路
１１ リレー
Ｃ１，Ｃ２ コンデンサ


DESCRIPTION OF SYMBOLS 1 AC power supply 2 DC intermediate charger 3 Inverter 4 Load 5 DC converter 6 Storage battery 7 Charging circuit 8 Discharge circuit 9 Switching element 10, 12 Voltage detection circuit 11 Relay C1, C2 Capacitor


Claims (2)

停電時に蓄電池からの直流電力を所望の電圧に変換して供給する無停電電源装置であって、前記蓄電池を遮断するための開閉素子と、前記蓄電池に前記開閉素子を介して接続された充電回路と、前記開閉素子の前記充電回路側の電圧を検出する電圧検出回路と、前記蓄電池に前記開閉素子を介して並列接続されたコンデンサ及びその放電回路と、を備え、前記開閉素子を操作して前記蓄電池または前記充電回路の異常検知、および前記充電回路の動作を停止して前記蓄電池の未接続検知を実行するようにしたことを特徴とする無停電電源装置。 A uninterruptible power supply for supplying DC power from the storage battery into a desired voltage at the time of power failure, the charging circuit and the switching element, connected via the switching element to the storage battery for cutting off the battery A voltage detection circuit for detecting a voltage on the charging circuit side of the switch element, a capacitor connected in parallel to the storage battery via the switch element, and a discharge circuit thereof , and operating the switch element An uninterruptible power supply apparatus , wherein an abnormality detection of the storage battery or the charging circuit and an operation of the charging circuit are stopped and an unconnected detection of the storage battery is executed . 停電時に蓄電池からの直流電力を所望の交流電圧に変換して負荷に供給する無停電電源装置であって、交流電力を直流電力に変換する第１の電力変換手段と、変換された直流電力を交流電力に変換する第２の電力変換手段と、前記蓄電池からの直流電力を所望の電圧に変換して前記第２の電力変換手段に供給する第３の電力変換手段と、前記蓄電池を遮断するための開閉素子と、前記蓄電池に前記開閉素子を介して接続された充電回路と、前記蓄電池に前記開閉素子を介して並列接続されたコンデンサ及びその放電回路と、前記開閉素子の前記コンデンサ側の電圧を検出する電圧検出回路とを備え、前記開閉素子を操作して前記蓄電池または前記充電回路の異常検知、および前記充電回路の動作を停止して前記蓄電池の未接続検知を実行するようにしたことを特徴とする無停電電源装置。 An uninterruptible power supply that converts DC power from a storage battery into a desired AC voltage and supplies it to a load during a power failure, and includes first power conversion means for converting AC power into DC power, and the converted DC power A second power conversion means for converting to AC power, a third power conversion means for converting DC power from the storage battery into a desired voltage and supplying the second power conversion means, and shutting off the storage battery and switching element for a charging circuit connected through said switching element to said storage battery, a capacitor and a discharge circuit connected in parallel via the switching element to the battery, the capacitor-side of the switching element and a voltage detection circuit for detecting a voltage, performing an anomaly detection, and stops the operation of the charging circuit unconnected detection of the battery of the battery or the charging circuit by operating the switching element Uninterruptible power supply, characterized in that had Unishi.
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JP2000245067A (en) * 1999-02-22 2000-09-08 Densei Lambda Kk Abnormality monitoring method of battery and its charging circuit
JP2001186688A (en) * 1999-12-22 2001-07-06 Matsushita Electric Works Ltd Connection detection circuit of backup current, and backup power supply device therewith
JP2001186689A (en) * 1999-12-24 2001-07-06 Mitsubishi Electric Corp Uninterruptible power supply device
JP2005020896A (en) * 2003-06-26 2005-01-20 Shin Kobe Electric Mach Co Ltd Uninterruptible power system

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JPH1175328A (en) * 1997-08-29 1999-03-16 Daikin Ind Ltd Storage type air conditioner

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Publication number Priority date Publication date Assignee Title
JP2000245067A (en) * 1999-02-22 2000-09-08 Densei Lambda Kk Abnormality monitoring method of battery and its charging circuit
JP2001186688A (en) * 1999-12-22 2001-07-06 Matsushita Electric Works Ltd Connection detection circuit of backup current, and backup power supply device therewith
JP2001186689A (en) * 1999-12-24 2001-07-06 Mitsubishi Electric Corp Uninterruptible power supply device
JP2005020896A (en) * 2003-06-26 2005-01-20 Shin Kobe Electric Mach Co Ltd Uninterruptible power system

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