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JP2006042495A - Power supply system - Google Patents

Power supply system Download PDF

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JP2006042495A
JP2006042495A JP2004218466A JP2004218466A JP2006042495A JP 2006042495 A JP2006042495 A JP 2006042495A JP 2004218466 A JP2004218466 A JP 2004218466A JP 2004218466 A JP2004218466 A JP 2004218466A JP 2006042495 A JP2006042495 A JP 2006042495A
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power supply
load
power
secondary battery
supplied
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Tomoyoshi Iketani
友良 池谷
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Pioneer Corp
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Pioneer Electronic Corp
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    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

<P>PROBLEM TO BE SOLVED: To prevent shutdown and malfunction of a computer and electronic equipment in a power supply system using a secondary battery. <P>SOLUTION: The system is so constructed that the following operation is performed: power from a commercial power source 11 is supplied to loads and stored in the secondary battery 16; and when power supply from the commercial power source is interrupted or drops, the power stored in the secondary battery 16 is supplied to the loads. The loads include a first load 15 whose toleration time for interruption or drop of power supply is longer and a second load 22 whose toleration time for interruption or drop of power supply is shorter. An uninterruptible power supply unit 21 is provided in the power supply path to the second load 22. The power supplied from the commercial power source 11 or the secondary battery 16 is supplied to the second load 22 through the uninterruptible power supply unit 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電力供給システムに関する。   The present invention relates to a power supply system.

商用電源等の電力系統から供給される電力を使用する工業生産、商業システム等の電力需要家において、大容量の電力を使用する場合、昼夜間の負荷変動を平準化する目的で、ナトリウム−硫黄電池（ＮＡＳ電池）等の２次電池を用いる電力供給システムが注目されている（例えば、特許文献１の２次電池装置）。   Sodium-sulfur for the purpose of leveling daytime and nighttime load fluctuations when using large-capacity electric power in industrial production and commercial systems that use electric power supplied from a power system such as a commercial power source. An electric power supply system using a secondary battery such as a battery (NAS battery) has attracted attention (for example, a secondary battery device of Patent Document 1).

図１（ａ）、（ｂ）は、従来技術における２次電池を用いた電力供給システムの概略構成を示すブロック図である。
図１（ａ）に示すように、従来技術における２次電池を用いた電力供給システム１は、高速切替スイッチ４、負荷６、２次電池装置８で構成されており、通常時は、高速切替スイッチが閉状態となり、矢印５の系統で示すように、商用電源２の商用電力系統３から負荷６に電力を供給するとともに、矢印７の系統で２次電池装置８を充電する。
この電力供給システム１において、停電等で商用電力系統３が切断または電圧が所定の電圧値より低下した場合は、図１（ｂ）のように、高速切替スイッチが開状態となり、負荷６への供給電力は２次電池系統９に切り換わる。
特開２０００−３２６６８号公報 FIGS. 1A and 1B are block diagrams showing a schematic configuration of a power supply system using a secondary battery in the prior art.
As shown in FIG. 1 (a), a power supply system 1 using a secondary battery in the prior art is composed of a high-speed switch 4, a load 6, and a secondary battery device 8. The switch is closed, and power is supplied from the commercial power system 3 of the commercial power source 2 to the load 6 as shown by the system indicated by the arrow 5, and the secondary battery device 8 is charged using the system indicated by the arrow 7.
In the power supply system 1, when the commercial power system 3 is cut off or the voltage drops below a predetermined voltage value due to a power failure or the like, the high-speed switch is opened as shown in FIG. The supplied power is switched to the secondary battery system 9.
JP 2000-32668 A

ところで、前述の図１の従来技術における２次電池を用いた電力供給システム１では、瞬時停電が発生した際に、負荷６に供給する電力系統の切り換え、即ち、商用電力系統３から停電時のバックアップ電源である２次電池系統９への切換え時間が２０ms（ミリ秒）以上かかる。   By the way, in the power supply system 1 using the secondary battery in the above-described prior art of FIG. 1, when an instantaneous power failure occurs, the power system supplied to the load 6 is switched, that is, from the commercial power system 3 at the time of the power failure. It takes 20 ms (milliseconds) or more to switch to the secondary battery system 9 as a backup power source.

負荷５が電圧変化に対する応答が遅い機器、即ち、放電ランプ、一般モーター等の一般電機機器であれば、切換え時間が２０ms以上かかっても、機器の動作に問題ない。
ところが、電圧変化に対する応答が速い電子機器、即ち、シーケンサー、パワーエレクトロニクス、可変速モーター等に対しては、切換え時間が２０ms以上かかってしまうと、機器の停止や誤動作を起こす虞があり、これらの電子機器の停電時の電力補償には、２０ms以下の応答速度が必要である。 If the load 5 is a device having a slow response to a voltage change, that is, a general electric device such as a discharge lamp or a general motor, there is no problem in the operation of the device even if the switching time is 20 ms or longer.
However, for electronic devices that have a fast response to voltage changes, ie, sequencers, power electronics, variable speed motors, etc., if the switching time takes 20 ms or longer, there is a risk that the devices will stop or malfunction. A response speed of 20 ms or less is required for power compensation when a power failure occurs in an electronic device.

即ち、コンピューターや電子機器等へ供給されている商用電源が瞬時停電等で切断または電圧低下した場合、２次電池を用いた従来の電力供給システムでは、コンピューターや電子機器の停止や誤動作を起こす虞があるという問題点がある。   That is, when the commercial power supplied to a computer or electronic device is cut off or the voltage drops due to an instantaneous power failure or the like, the conventional power supply system using a secondary battery may cause the computer or electronic device to stop or malfunction. There is a problem that there is.

本発明が解決しようとする課題としては、上述した従来技術において生じる、２次電池を用いた電力供給システムにおいて、コンピューターや電子機器の停止や誤動作を起こす虞があるという問題が一例として挙げられる。   As an example of the problem to be solved by the present invention, in the power supply system using the secondary battery that occurs in the above-described prior art, there is a problem that the computer or the electronic device may stop or malfunction.

請求項１に記載の電力供給システムは、商用電源からの電力を負荷に供給するとと共に２次電池に貯蔵し、商用電源からの電力供給が停止または低下したとき前記２次電池に貯蔵された電力を前記負荷に供給する電力供給システムであって、前記負荷は、供給される電力の停止または低下に対する許容時間が長い第１負荷と、供給される電力の停止または低下に対する許容時間が短い第２負荷とを有し、前記第２負荷への電力供給経路に無停電電源部を設け、前記商用電源または前記２次電池から供給される電力を前記無停電電源部を介して前記第２負荷に供給することを特徴とする。   The power supply system according to claim 1, wherein power from a commercial power supply is supplied to a load and stored in a secondary battery, and the power stored in the secondary battery when power supply from the commercial power supply is stopped or lowered. The load includes a first load having a long permissible time for stopping or lowering the supplied power, and a second permissible time for stopping or lowering the supplied power. And an uninterruptible power supply unit is provided in the power supply path to the second load, and the electric power supplied from the commercial power supply or the secondary battery is supplied to the second load via the uninterruptible power supply unit. It is characterized by supplying.

以下、本発明に係る電力供給システムの実施の形態について、図面を参照して詳細に説明する。
図２および図３は、本発明に係る実施の形態における電力供給システムの概略構成を示すブロック図であり、図２は通常時の状態を示し、図３は停電時の状態を示す。 Hereinafter, embodiments of a power supply system according to the present invention will be described in detail with reference to the drawings.
2 and 3 are block diagrams showing a schematic configuration of the power supply system according to the embodiment of the present invention. FIG. 2 shows a normal state and FIG. 3 shows a power failure state.

図２および図３に示すように、本実施の形態における電力供給システム１０は、停電検出部１３、高速切替スイッチ１４、第１負荷１５、２次電池１６、交直変換装置１７、直交変換装置１８、高速切替スイッチ１９，２０、無停電電源部２１、第２負荷２２を含んで構成される。   As shown in FIGS. 2 and 3, the power supply system 10 according to the present embodiment includes a power failure detection unit 13, a high-speed changeover switch 14, a first load 15, a secondary battery 16, an AC / DC converter 17, and an orthogonal converter 18. , High-speed changeover switches 19 and 20, uninterruptible power supply 21, and second load 22.

電力供給システム１０は、商用電源１１からの電力を供給するラインである商用電力系統１２に接続され、高速切替スイッチ１４を介して第１負荷１５に接続され、さらに、無停電電源部２１を介して第２負荷１５に接続され、それぞれの負荷に電力が供給される。
また、２次電池１６は、商用電力系統１２から高速切替スイッチ１４と高速切替スイッチ１９と交直変換装置１７とを介して接続され、商用電源１１から２次電池１６に貯蔵（充電）される。 The power supply system 10 is connected to a commercial power system 12 that is a line for supplying power from the commercial power supply 11, is connected to the first load 15 via the high-speed switch 14, and is further connected to the uninterruptible power supply unit 21. Are connected to the second load 15 and power is supplied to each load.
The secondary battery 16 is connected to the secondary battery 16 from the commercial power supply 11 by being connected to the commercial power system 12 via the high-speed switch 14, the high-speed switch 19, and the AC / DC converter 17.

また、２次電池１６は、高速切替スイッチ２０と直交変換装置１８とを介して、第１負荷１５および第２負荷２２（無停電電源部２１を介して）に接続され、商用電源１１からの電力供給が停止または低下したとき２次電池１６に貯蔵された電力を第１負荷１５および第２負荷２２に供給する。
第１負荷１５は、供給される電力の停止または低下に対する許容時間が長い（約２０ms以上の）負荷であり、例えば、電圧変化に対する応答が遅い機器であり、具体的には、放電ランプ、一般モーター等の一般電機機器などである。
第２負荷２２は、供給される電力の停止または低下に対する許容時間が短い（約２０ms未満の）負荷であり、例えば、電圧変化に対する応答が速い機器であり、即ち、シーケンサー、パワーエレクトロニクス、可変速モーター等の電子機器やコンピューターなどである。 Further, the secondary battery 16 is connected to the first load 15 and the second load 22 (via the uninterruptible power supply unit 21) via the high-speed changeover switch 20 and the orthogonal transformation device 18, and the commercial battery 11 When the power supply is stopped or lowered, the power stored in the secondary battery 16 is supplied to the first load 15 and the second load 22.
The first load 15 is a load having a long allowable time (about 20 ms or more) for stopping or lowering the supplied power, and is, for example, a device having a slow response to a voltage change, specifically, a discharge lamp, General electric equipment such as motors.
The second load 22 is a load having a short allowable time (less than about 20 ms) for stopping or lowering the supplied power, and is a device having a quick response to a voltage change, for example, a sequencer, power electronics, variable speed. Electronic devices such as motors and computers.

次に、図２および図３を参照して本実施の形態における電力供給システムの詳細およびその動作を説明する。
本実施の形態における電力供給システム１０においては、停電検出部１３が、商用電力系統１２からの電力供給が切断や電圧低下（あるいは上昇）を常時監視しており、通常時には、図２に示すように、高速切替スイッチ１４及び１９を閉状態とし、高速切替スイッチ２０を開状態とするように制御する。 Next, with reference to FIG. 2 and FIG. 3, the detail and operation | movement of the electric power supply system in this Embodiment are demonstrated.
In the power supply system 10 according to the present embodiment, the power failure detection unit 13 constantly monitors the power supply from the commercial power system 12 for disconnection or voltage drop (or rise), and at normal times, as shown in FIG. Further, the high speed changeover switches 14 and 19 are controlled to be closed, and the high speed changeover switch 20 is opened.

通常時においては、図２の矢印で示すように、閉状態となっている高速切替スイッチ１４を介して、商用電力系統１２から第１負荷１５および無停電電源部２１を介して第２負荷２２に電力を供給する。これとともに、閉状態となっている高速切替スイッチ１９を介して、交直変換装置１７により直流に変換された電力を２次電池１６へ貯蔵（充電）する。
商用電源１１は交流電源であるので、交直変換装置１７によって、交流を直流に変換して２次電池１６を充電する必要がある。２次電池１６としては、例えば、ナトリウム−硫黄電池（ＮＡＳ電池）を用いる。 In a normal state, as indicated by an arrow in FIG. 2, the second load 22 is connected from the commercial power system 12 via the first load 15 and the uninterruptible power supply unit 21 via the high-speed changeover switch 14 in the closed state. To supply power. At the same time, the power converted into direct current by the AC / DC converter 17 is stored (charged) in the secondary battery 16 through the high-speed changeover switch 19 in the closed state.
Since the commercial power source 11 is an AC power source, it is necessary to charge the secondary battery 16 by converting AC to DC by the AC / DC converter 17. As the secondary battery 16, for example, a sodium-sulfur battery (NAS battery) is used.

また、電力供給システム１０において、停電時、即ち商用電力系統１２が切断または電圧が所定の電圧値より低下した場合は、停電検出部１３がこの状態を検出して、図３に示すように、高速切替スイッチ１４及び１９を開状態とし、高速切替スイッチ２０を閉状態とするように制御する。
なお、商用電力系統１２に異常な高電圧がかかった場合など、電圧が所定の電圧値より上昇した場合においても、停電検出部１３がこの状態を検出して、上記停電時同様、図３の状態となるよう制御するようにしてもよい。 Further, in the power supply system 10, at the time of a power failure, that is, when the commercial power system 12 is disconnected or the voltage is lower than a predetermined voltage value, the power failure detection unit 13 detects this state, as shown in FIG. Control is performed so that the high-speed switches 14 and 19 are opened and the high-speed switch 20 is closed.
Even when the voltage rises above a predetermined voltage value, such as when an abnormally high voltage is applied to the commercial power system 12, the power failure detection unit 13 detects this state, and as in the case of the power failure, as shown in FIG. You may make it control so that it may be in a state.

停電時においては、開状態となった高速切替スイッチ１４により、商用電力系統１２から遮断される。また、開状態となった高速切替スイッチ１９により、２次電池１６への電力の貯蔵（充電）も遮断される。一方、閉状態となった高速切替スイッチ２０により、２次電池１６から第１負荷１５および第２負荷２２への電力供給が、図３の矢印で示すように行われる。
このとき、２次電池１６から出力された直流の電力が直交変換装置１８により交流に変換されて第１負荷１５へは直接供給され、第２負荷２２へは無停電電源部２１を介して供給される。 At the time of a power failure, the commercial power system 12 is cut off by the high-speed changeover switch 14 that is in the open state. In addition, the storage (charging) of power to the secondary battery 16 is also blocked by the high-speed changeover switch 19 that has been opened. On the other hand, the power supply from the secondary battery 16 to the first load 15 and the second load 22 is performed by the high-speed changeover switch 20 in the closed state as shown by arrows in FIG.
At this time, the DC power output from the secondary battery 16 is converted into AC by the orthogonal transformation device 18 and supplied directly to the first load 15 and supplied to the second load 22 via the uninterruptible power supply unit 21. Is done.

無停電電源部２１は、例えば、ＵＰＳ（Uninterruptible Power Supply or System）等の給電切換時間の短い無停電電源装置である。そして、無停電電源部２１は、その内部に停電検出回路（図示せず）を備えており、停電が発生してから約１０ms（少なくとも２０ms未満）で無停電電源部２１内の蓄電池（図示せず）から第２負荷２２へ電力を供給する。また、無停電電源部２１（ＵＰＳ）は、短時間であれば定格出力を超える電力供給が可能である。   The uninterruptible power supply unit 21 is an uninterruptible power supply device with a short power supply switching time such as UPS (Uninterruptible Power Supply or System). And the uninterruptible power supply part 21 is equipped with the power failure detection circuit (not shown) in the inside, and the storage battery (not shown) in the uninterruptible power supply part 21 is about 10 ms (at least less than 20 ms) after a power failure occurs. To the second load 22. The uninterruptible power supply 21 (UPS) can supply power exceeding the rated output for a short time.

一方、２次電池１６（ＮＡＳ電池）は、停電が発生してからの電力供給応答が比較的遅く、２次電池１６（ＮＡＳ電池）から電力供給をするまでの時間は約２０ms以上、さらに、供給が安定するまでに、約５０msかかってしまうため、第２負荷２２へは、上記のように、無停電電源部２１を介して電力供給をすることにより、第２負荷２２を停止させることなく安定した電力供給を補償することができる。   On the other hand, the secondary battery 16 (NAS battery) has a relatively slow power supply response after the occurrence of a power failure, and the time from the secondary battery 16 (NAS battery) to supplying power is about 20 ms or more. Since it takes about 50 ms for the supply to stabilize, the second load 22 is supplied with power via the uninterruptible power supply unit 21 without stopping the second load 22 as described above. A stable power supply can be compensated.

上記の無停電電源部２１として、使用できるＵＰＳの種類としては、例えば、常時インバータ給電方式ＵＰＳ、常時商用給電方式ＵＰＳ（多機能ＳＰＳ：Standby Power Supply or System）等の高調波電流を抑制した高速切換（10ms以下）が可能なシステムがあげられる。これらのＵＰＳは、鉛蓄電池、アルカリ蓄電池を電源としたものが主流であるが、高速切換（１０ms以下）が可能であれば、フライホイールＵＰＳ等を使用することも可能である。   As the type of UPS that can be used as the uninterruptible power supply unit 21, for example, a high-speed that suppresses harmonic currents such as a constant inverter power supply system UPS and a constant commercial power supply system UPS (multifunctional SPS: Standby Power Supply or System) Examples include systems that can be switched (10 ms or less). Most of these UPSs use lead-acid batteries or alkaline storage batteries as the power source, but if high-speed switching (10 ms or less) is possible, a flywheel UPS or the like can be used.

なお、無停電電源部２１（ＵＰＳ）は長時間の電力補償が困難であり、もし、電力供給システム１０を全てを無停電電源部２１（ＵＰＳ）で賄うと、無停電電源部２１が非常に大きな規模で高価なものとなってしまいシステムの実現が困難である。
これに対して、本実施の形態の電力供給システム１０では、ＵＰＳは２次電池１６（ＮＡＳ電池）の電力供給が安定するまでの間（５０ms以下）をバックアップするだけでよく、さらに、瞬時停電の許容時間が短い負荷（第２負荷２２）のみをバックアップすればよいので、無停電電源部２１は小型のＵＰＳで済み、コストも安価となる。 The uninterruptible power supply unit 21 (UPS) is difficult to compensate for power for a long time. If the entire power supply system 10 is covered by the uninterruptible power supply unit 21 (UPS), the uninterruptible power supply unit 21 is very It becomes expensive on a large scale and it is difficult to realize the system.
On the other hand, in the power supply system 10 according to the present embodiment, the UPS only needs to back up until the power supply of the secondary battery 16 (NAS battery) is stabilized (50 ms or less). Therefore, the uninterruptible power supply unit 21 can be a small UPS and the cost can be reduced.

以上、詳述したように、本発明の実施の形態に係る電力供給システム１０は、商用電源１１からの電力を負荷に供給するとと共に２次電池１６に貯蔵し、商用電源１１からの電力供給が停止または低下したとき２次電池１６に貯蔵された電力を負荷に供給するシステムであり、負荷は、供給される電力の停止または低下に対する許容時間が長い第１負荷１５と、供給される電力の停止または低下に対する許容時間が短い第２負荷２２とを有し、第２負荷２２への電力供給経路に無停電電源部２１を設け、商用電源１１または２次電池１６から供給される電力を無停電電源部２１を介して第２負荷２２に供給する。
これにより、２次電池を用いた電力供給システムにおいて、商用電源が瞬時停電等で切断または電圧低下した場合に、供給される電力の停止または低下に対する許容時間が短いコンピューターや電子機器の停止や誤動作を防ぐことができる。
また、供給される電力の停止または低下に対する許容時間が長い負荷に対しては、無停電電源部（ＵＰＳ）を使用しなくてもよいため、無停電電源部は小型のＵＰＳで済み、電力供給システムのコストを安価に抑えることができる。 As described above in detail, the power supply system 10 according to the embodiment of the present invention supplies power from the commercial power supply 11 to the load and stores it in the secondary battery 16, and supplies power from the commercial power supply 11. The system supplies power stored in the secondary battery 16 to a load when the battery is stopped or reduced. The load includes a first load 15 having a long allowable time for stopping or reducing the supplied power, and The second load 22 has a short allowable time for stopping or lowering, the uninterruptible power supply unit 21 is provided in the power supply path to the second load 22, and no power is supplied from the commercial power supply 11 or the secondary battery 16. The power is supplied to the second load 22 via the power failure power supply unit 21.
As a result, in a power supply system using a secondary battery, when the commercial power supply is cut off or the voltage drops due to an instantaneous power failure or the like, the computer or electronic device stops or malfunctions with a short allowable time for stopping or dropping the supplied power Can be prevented.
In addition, the uninterruptible power supply (UPS) does not have to be used for loads that have a long allowable time for stopping or lowering the supplied power. The system cost can be kept low.

従来技術における２次電池を用いた電力供給システムの概略構成を示すブロック図であり、（ａ）は通常時、（ｂ）は停電時の状態を示す。It is a block diagram which shows schematic structure of the electric power supply system using the secondary battery in a prior art, (a) is normal time, (b) shows the state at the time of a power failure. 本発明に係る実施の形態における電力供給システムの概略構成を示すブロック図であり、通常時の状態を示す図である。It is a block diagram which shows schematic structure of the electric power supply system in embodiment which concerns on this invention, and is a figure which shows the state at the time of normal. 本発明に係る実施の形態における電力供給システムの概略構成を示すブロック図であり、停電時の状態を示す図である。It is a block diagram which shows schematic structure of the electric power supply system in embodiment which concerns on this invention, and is a figure which shows the state at the time of a power failure.

符号の説明Explanation of symbols

１０ 電力供給システム
１１ 商用電源
１３ 停電検出部
１４、１９、２０ 高速切替スイッチ
１５ 第１負荷
１６ ２次電池
２１ 無停電電源部
２２ 第２負荷 DESCRIPTION OF SYMBOLS 10 Power supply system 11 Commercial power supply 13 Power failure detection part 14, 19, 20 High speed change-over switch 15 1st load 16 Secondary battery 21 Uninterruptible power supply part 22 2nd load

Claims (4)

商用電源からの電力を負荷に供給すると共に２次電池に貯蔵し、商用電源からの電力供給が停止または低下したとき前記２次電池に貯蔵された電力を前記負荷に供給する電力供給システムであって、
前記負荷は、供給される電力の停止または低下に対する許容時間が長い第１負荷と、供給される電力の停止または低下に対する許容時間が短い第２負荷とを有し、
前記第２負荷への電力供給経路に無停電電源部を設け、前記商用電源または前記２次電池から供給される電力を前記無停電電源部を介して前記第２負荷に供給することを特徴とする電力供給システム。 A power supply system that supplies power from a commercial power source to a load and stores the power in a secondary battery, and supplies power stored in the secondary battery to the load when power supply from the commercial power source is stopped or lowered. And
The load includes a first load having a long allowable time for stopping or reducing the supplied power, and a second load having a short allowable time for stopping or reducing the supplied power,
An uninterruptible power supply unit is provided in a power supply path to the second load, and power supplied from the commercial power supply or the secondary battery is supplied to the second load via the uninterruptible power supply unit. Power supply system. 前記２次電池は、ナトリウム−硫黄電池であることを特徴とする請求項１記載の電力供給システム。 The power supply system according to claim 1, wherein the secondary battery is a sodium-sulfur battery. 前記無停電電源部は、鉛蓄電池、アルカリ蓄電池のいずれかを含むことを特徴とする請求項１または２に記載の電力供給システム。 The power supply system according to claim 1 or 2, wherein the uninterruptible power supply unit includes either a lead storage battery or an alkaline storage battery. 前記第１負荷の前記許容時間は２０ミリ秒以上であり、前記第２負荷の前記許容時間は２０ミリ秒未満であることを特徴とする請求項１乃至３のいずれかに記載の電力供給システム。 4. The power supply system according to claim 1, wherein the allowable time of the first load is 20 milliseconds or more, and the allowable time of the second load is less than 20 milliseconds. 5. .
JP2004218466A 2004-07-27 2004-07-27 Power supply system Abandoned JP2006042495A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010236810A (en) * 2009-03-31 2010-10-21 Sanyo Electric Co Ltd Cooling delivery carriage
EP2333930A2 (en) 2009-12-09 2011-06-15 Sanyo Electric Co., Ltd. Server and uninterruptable power supply housed in that server
EP2333931A2 (en) 2009-12-09 2011-06-15 Sanyo Electric Co., Ltd. Server uninterruptable power supply

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010236810A (en) * 2009-03-31 2010-10-21 Sanyo Electric Co Ltd Cooling delivery carriage
EP2333930A2 (en) 2009-12-09 2011-06-15 Sanyo Electric Co., Ltd. Server and uninterruptable power supply housed in that server
EP2333931A2 (en) 2009-12-09 2011-06-15 Sanyo Electric Co., Ltd. Server uninterruptable power supply

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