JP2012125122A - Power system - Google Patents

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JP2012125122A
JP2012125122A JP2010276291A JP2010276291A JP2012125122A JP 2012125122 A JP2012125122 A JP 2012125122A JP 2010276291 A JP2010276291 A JP 2010276291A JP 2010276291 A JP2010276291 A JP 2010276291A JP 2012125122 A JP2012125122 A JP 2012125122A
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power
pole
power supply
assembled battery
load
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Keita Takahashi
慶多 高橋
Keiichi Saito
景一 斉藤
Akihiro Miyasaka
明宏 宮坂
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Nippon Telegraph and Telephone 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

PROBLEM TO BE SOLVED: To implement a backup feed at a power failure even when electric cells are disconnected for inspection or replacement.SOLUTION: A power system 10 includes a battery pack 2, a rectifier 1 and chargers 4. The battery pack 2 has n+m (n, m are natural numbers) electric cells 8 and supplies DC power to a load 6 at a failure in an AC power supply 5. The rectifier 1 converts AC power output from the AC power supply 5 into DC power, which is supplied to the load 6. The chargers 4 charge the plurality of electric cells 8, respectively, with the AC power output from the AC power supply 5. The battery pack 2 can connect in series n electric cells 8 arbitrarily selected from the plurality of electric cells 8. The rectifier 1 is set at an output voltage equal to or higher than the full charge voltage of the battery pack 8. The charges 4 are set at an output voltage equal to the full charge voltage of the electric cells 8 to be charged.

Description

本発明は、電源システムに関する。   The present invention relates to a power supply system.

従来、交流電源から出力される交流電力を直流電力に変換して負荷へ供給する電源システムがある。図４は、従来の電源システムの一例を示す図である。図４に示すように、例えば、従来の電源システム２０は、整流器１１と、組電池１２とを有する。整流器１１は、交流電源１５から出力される交流電力を直流電力に変換して負荷１６へ供給する。組電池１２は、複数の単電池１７を直列に接続して構成される。また、組電池１２は、整流器１１から出力される直流電力により充電され、交流電源１５の停電時に負荷１６へ直流電力を供給する。このように、交流電源１５の停電時に組電池１２が負荷１６へ直流電力を供給することをバックアップ給電と呼ぶ。   2. Description of the Related Art Conventionally, there is a power supply system that converts AC power output from an AC power source into DC power and supplies it to a load. FIG. 4 is a diagram illustrating an example of a conventional power supply system. As shown in FIG. 4, for example, the conventional power supply system 20 includes a rectifier 11 and an assembled battery 12. The rectifier 11 converts AC power output from the AC power supply 15 into DC power and supplies the DC power to the load 16. The assembled battery 12 is configured by connecting a plurality of unit cells 17 in series. The assembled battery 12 is charged with DC power output from the rectifier 11 and supplies DC power to the load 16 when the AC power supply 15 is powered off. Thus, when the battery pack 12 supplies DC power to the load 16 at the time of a power failure of the AC power supply 15 is referred to as backup power supply.

特開２００８−１４８４８５号公報JP 2008-148485 A 特開２００８−２１１９３５号公報JP 2008-211195 A 特開２００８−２７８６６８号公報JP 2008-278668 A

しかしながら、上述した従来の電源システムでは、点検や交換のために単電池が切り離される場合に、停電時のバックアップ給電を行うことができないという課題があった。   However, the above-described conventional power supply system has a problem that backup power cannot be supplied in the event of a power failure when a single cell is disconnected for inspection or replacement.

例えば、図４に示す電源システム２０では、交流電源１５が有効である限りは、組電池１２は常に充電される状態にある。また、組電池１２の印加電圧（組電池１２に印加される電圧）すなわち整流器１１の出力電圧は、単電池１７の満充電電圧と単電池１７の直列数との積に設定される。そのため、交流電源１５の停電時には、並列接続された組電池１２により瞬断なく負荷１６への給電が継続される。   For example, in the power supply system 20 shown in FIG. 4, the assembled battery 12 is always charged as long as the AC power supply 15 is valid. Further, the applied voltage of the assembled battery 12 (voltage applied to the assembled battery 12), that is, the output voltage of the rectifier 11 is set to the product of the full charge voltage of the single battery 17 and the number of series of the single batteries 17. Therefore, at the time of a power failure of the AC power supply 15, power supply to the load 16 is continued without interruption by the battery pack 12 connected in parallel.

このような電源システム２０では、長期間の運用によって、組電池１２を構成する一部の単電池１７について点検や交換が必要になる場合がある。この場合には、点検又は交換の対象となる単電池１７が組電池１２から切り離され、充放電試験や交換作業が行われる。そして、この点検又は交換が行われている間は、単電池１７や組電池１２の接続が切り離されるため、停電発生時のバックアップ給電が不可能になる。このように、単電池を複数直列接続して構成した組電池による直流バックアップ電源システムでは、点検や交換のために単電池１７が切り離される場合に、停電時のバックアップ給電を行うことができなくなってしまう。   In such a power supply system 20, it may be necessary to inspect or replace some of the unit cells 17 constituting the assembled battery 12 due to long-term operation. In this case, the unit cell 17 to be inspected or replaced is disconnected from the assembled battery 12, and a charge / discharge test or replacement work is performed. And while this inspection or replacement is being performed, the connection of the unit cell 17 and the assembled battery 12 is disconnected, so that backup power supply when a power failure occurs becomes impossible. Thus, in a DC backup power supply system using a battery pack configured by connecting a plurality of cells in series, when the cell 17 is disconnected for inspection or replacement, backup power supply during a power outage cannot be performed. End up.

本発明は、上記に鑑みてなされたものであって、点検や交換のために単電池が切り離される場合でも、停電時のバックアップ給電を行うことが可能な電源システムを提供することを目的とする。   The present invention has been made in view of the above, and an object thereof is to provide a power supply system capable of performing backup power supply at the time of a power failure even when a single cell is disconnected for inspection or replacement. .

上述した課題を解決し、目的を達成するために、本発明に係る電源システムは、交流電源から出力される交流電力を直流電力に変換して負荷へ供給する整流器と、ｎ＋ｍ（ｎ、ｍは自然数）個の複数の蓄電池を有し、前記交流電源の停電時に前記負荷へ直流電力を供給する組電池と、前記交流電源から出力される交流電力を用いて前記複数の蓄電池それぞれを充電する充電器とを有し、前記組電池は、前記複数の蓄電池の中から任意に選択されたｎ個の蓄電池を直列に接続して得られる電圧を出力し、前記整流器の出力電圧は、前記組電池の満充電電圧以上に設定され、前記充電器の出力電圧は、充電対象の前記蓄電池の満充電電圧に設定されることを特徴とする。   In order to solve the above-described problems and achieve the object, a power supply system according to the present invention includes a rectifier that converts AC power output from an AC power source into DC power and supplies the DC power to a load, and n + m (n and m are A battery that has a plurality of (natural number) storage batteries and supplies DC power to the load during a power failure of the AC power supply, and charging that charges each of the storage batteries using AC power output from the AC power supply And the assembled battery outputs a voltage obtained by connecting n storage batteries arbitrarily selected from the plurality of storage batteries in series, and the output voltage of the rectifier is The full charge voltage is set to be equal to or higher than the full charge voltage, and the output voltage of the charger is set to the full charge voltage of the storage battery to be charged.

本発明によれば、点検や交換のために単電池が切り離される場合でも、停電時のバックアップ給電を行うことが可能になるという効果を奏する。   According to the present invention, there is an effect that it is possible to perform backup power supply during a power failure even when a single cell is disconnected for inspection or replacement.

図１は、本実施例に係る電源システムの構成例を示す図である。FIG. 1 is a diagram illustrating a configuration example of a power supply system according to the present embodiment. 図２は、本実施例に係るバイパス付単電池を示す図である。FIG. 2 is a diagram showing a single cell with bypass according to the present embodiment. 図３は、本実施例に係る電源システムにおける単電池の点検又は交換を説明するための図である。FIG. 3 is a diagram for explaining inspection or replacement of the unit cell in the power supply system according to the present embodiment. 図４は、従来の電源システムの一例を示す図である。FIG. 4 is a diagram illustrating an example of a conventional power supply system.

以下に、本発明に係る電源システムの実施例を図面に基づいて詳細に説明する。なお、以下に示す実施例では、交流電源から出力される交流電源を負荷へ供給する電源システムに本発明を適用した場合について説明するが、この実施例により本発明が限定されるものではない。   Embodiments of a power supply system according to the present invention will be described below in detail with reference to the drawings. In the embodiment described below, a case where the present invention is applied to a power supply system that supplies an AC power output from an AC power supply to a load will be described. However, the present invention is not limited to this embodiment.

まず、図１を用いて、本実施例に係る電源システムの構成例について説明する。本実施例に係る電源システムは、交流電源から供給される交流電力を直流電力に変換し、変換後の直流電力を負荷に供給する。図１は、本実施例に係る電源システムの構成例を示す図である。図１に示すように、本実施例に係る電源システム１０は、整流器１と、組電池２と、ダイオード３と、充電器４とを備える。   First, a configuration example of a power supply system according to the present embodiment will be described with reference to FIG. The power supply system according to the present embodiment converts AC power supplied from an AC power source into DC power, and supplies the converted DC power to a load. FIG. 1 is a diagram illustrating a configuration example of a power supply system according to the present embodiment. As shown in FIG. 1, the power supply system 10 according to the present embodiment includes a rectifier 1, an assembled battery 2, a diode 3, and a charger 4.

整流器１は、交流電源５から出力される交流電力を直流電力に変換して負荷６へ供給する。   The rectifier 1 converts AC power output from the AC power source 5 into DC power and supplies the DC power to the load 6.

組電池２は、ｎ＋ｍ（ｎ、ｍは自然数）個の複数のバイパス付単電池７を有し、交流電源５の停電時に負荷６へ直流電力を供給する。本実施例では、負荷６への給電は、整流器１の出力と組電池２との並列接続により行なわれる。そのため、交流電源５の停電等により整流器１の出力が停止した場合には、組電池２が出力する電力が負荷６へ供給される。   The assembled battery 2 includes n + m (n and m are natural numbers) plural bypass-attached cells 7 and supplies DC power to the load 6 when the AC power supply 5 is powered off. In this embodiment, power supply to the load 6 is performed by parallel connection of the output of the rectifier 1 and the assembled battery 2. Therefore, when the output of the rectifier 1 is stopped due to a power failure or the like of the AC power supply 5, the power output from the assembled battery 2 is supplied to the load 6.

バイパス付単電池７は、単電池８と、単極双投スイッチ９とを有する。単電池８は、蓄電池である。本実施例では、単電池８として、定格電圧が２．０［Ｖ（ボルト）］、満充電電圧が２．２［Ｖ］、定格容量が２００［Ａｈ（アンペアアワー）］の鉛蓄電池が用いられる。単極双投スイッチ９は、第１の極を第２の極及び第３の極のいずれか一方に接続する。ここで、単極双投スイッチ９は、第２の極が蓄電池の一方の極に直列接続され、第３の極が該蓄電池の他方の極に接続される。   The bypass cell 7 includes a cell 8 and a single pole double throw switch 9. The single battery 8 is a storage battery. In this embodiment, a lead storage battery having a rated voltage of 2.0 [V (volts)], a full charge voltage of 2.2 [V], and a rated capacity of 200 [Ah (ampere hours)] is used as the unit cell 8. It is done. The single pole double throw switch 9 connects the first pole to either the second pole or the third pole. Here, the single-pole double-throw switch 9 has a second pole connected in series to one pole of the storage battery and a third pole connected to the other pole of the storage battery.

図２は、本実施例に係るバイパス付単電池７を示す図である。図２に示すように、例えば、単極双投スイッチ９は、第１の極として極Ａを有し、第２の極として極Ｂを有し、第３の極として極Ｃを有する。そして、単極双投スイッチ９は、極Ａと極Ｂとの接続、及び、極Ａと極Ｃとの接続のいずれか一方を行うように構成されており、極Ｂと極Ｃとの接続は行わない。   FIG. 2 is a diagram showing the bypass-equipped cell 7 according to the present embodiment. As shown in FIG. 2, for example, the single-pole double-throw switch 9 has a pole A as a first pole, a pole B as a second pole, and a pole C as a third pole. The single-pole double-throw switch 9 is configured to perform either one of connection between the pole A and the pole B or connection between the pole A and the pole C, and connection between the pole B and the pole C. Do not do.

ここで、単極双投スイッチ９の極Ａは、隣接する他のバイパス付単電池７が有する単電池８のマイナス極に接続される。また、極Ｂは、単電池８のプラス極に接続され、極Ｃは、単電池８のマイナス極に接続される。ただし、組電池２の出力端に位置するバイパス付単電池７については、極Ａがダイオード３のアノードに接続される。   Here, the pole A of the single-pole double-throw switch 9 is connected to the negative pole of the unit cell 8 of the other adjacent unit cell 7 with bypass. The pole B is connected to the positive pole of the unit cell 8, and the pole C is connected to the minus pole of the unit cell 8. However, for the bypass cell 7 positioned at the output end of the assembled battery 2, the pole A is connected to the anode of the diode 3.

すなわち、バイパス付単電池７は、単極双投スイッチ９の極Ａと極Ｂとが接続されることにより、単電池８が組電池２に接続された状態となる。一方、バイパス付単電池７は、単極双投スイッチ９の極Ａと極Ｃとが接続されることにより、単電池８が組電池２から電気的に切り離された状態となる。このように、バイパス付単電池７には、２つの接続状態がある。   That is, the single cell 7 with bypass is in a state where the single cell 8 is connected to the assembled battery 2 by connecting the pole A and the pole B of the single-pole double-throw switch 9. On the other hand, the single cell 7 with bypass is in a state where the single cell 8 is electrically disconnected from the assembled battery 2 by connecting the pole A and the pole C of the single-pole double-throw switch 9. As described above, the bypass cell 7 has two connection states.

ここで、任意に選択されたｎ個のバイパス付単電池７において、単電池８が組電池２に接続された状態となった場合には、ｎ個のバイパス付単電池７が直列に接続された状態となる。この結果、組電池２の出力電圧は１２．０［Ｖ］のｎ倍となる。例えば、全てのバイパス付単電池７について単電池８が接続された状態となった場合には、７個のバイパス付単電池７が直列に接続される。この場合には、組電池２の出力電圧は、１４．０［Ｖ］となる。   Here, in the arbitrarily selected n bypass cell units 7, when the unit cell 8 is connected to the assembled battery 2, the n bypass cell units 7 are connected in series. It becomes a state. As a result, the output voltage of the assembled battery 2 is n times 12.0 [V]. For example, when the unit cells 8 are connected to all the unit cells 7 with bypass, the seven unit cells 7 with bypass are connected in series. In this case, the output voltage of the assembled battery 2 is 14.0 [V].

なお、本実施例では、７個の単電池８のうち１個の単電池８が点検又は交換時の予備として用いられることとする。例えば、図１に示すように、７個のバイパス付単電池７のうち６個のバイパス付単電池（図１に示す上から２〜７番目のバイパス付単電池７）について、単電池８が接続された状態となる。この場合には、６個の単電池８が直列に接続された状態となるので、組電池２の出力電圧は１２．０［Ｖ］となる。すなわち、この状態では、組電池２は、定格電圧が１２．０［Ｖ］、満充電電圧が１３．２［Ｖ］、定格容量が２００［Ａｈ］となる。そして、図１に示すように、７個のバイパス付単電池７のうち残り１個のバイパス付単電池７（図１に示す上から１番目のバイパス付単電池７）については、単電池８がバイパスされた状態となっている。この単電池８が、点検又は交換時の予備として用いられる。   In this embodiment, one single cell 8 out of the seven single cells 8 is used as a spare for inspection or replacement. For example, as shown in FIG. 1, for six bypass-attached cells 7 out of seven bypass-attached cells 7 (the second to seventh bypass-attached cells 7 shown in FIG. 1), Connected. In this case, since the six unit cells 8 are connected in series, the output voltage of the assembled battery 2 is 12.0 [V]. That is, in this state, the assembled battery 2 has a rated voltage of 12.0 [V], a full charge voltage of 13.2 [V], and a rated capacity of 200 [Ah]. As shown in FIG. 1, the remaining one bypass cell 7 among the seven bypass cells 7 (the first bypass cell 7 shown in FIG. 1) is the cell 8. Is in a bypassed state. This single cell 8 is used as a spare for inspection or replacement.

図１の説明にもどって、ダイオード３は、組電池２から出力される電力を負荷６へ供給する。具体的には、ダイオード３は、アノードが組電池２の出力に接続され、カソードが負荷６の入力端に接続される。   Returning to the description of FIG. 1, the diode 3 supplies power output from the assembled battery 2 to the load 6. Specifically, the diode 3 has an anode connected to the output of the assembled battery 2 and a cathode connected to the input terminal of the load 6.

充電器４は、交流電源５から出力される交流電力を用いて、複数の単電池８それぞれを充電する。本実施例では、充電器４と整流器１とは交流電源５に並列に接続される。そのため、交流電源５が有効である場合には、交流電源５から出力される交流電力が整流器１及び充電器４それぞれに供給される。すなわち、交流電源５が有効である場合には、負荷６への給電と組電池２の充電とが並列に行われる。   The charger 4 charges each of the plurality of single cells 8 using AC power output from the AC power supply 5. In the present embodiment, the charger 4 and the rectifier 1 are connected in parallel to the AC power supply 5. Therefore, when the AC power supply 5 is effective, AC power output from the AC power supply 5 is supplied to each of the rectifier 1 and the charger 4. That is, when the AC power supply 5 is effective, power supply to the load 6 and charging of the assembled battery 2 are performed in parallel.

このような構成のもと、本実施例に係る電源システム１０では、組電池２は、複数の単電池８の中から任意に選択されたｎ個の単電池８を直列に接続して得られる電圧を出力する。そして、本実施例では、負荷６の最低動作電圧は、単電池８の最低使用電圧とｎとの積より低いこととする。   Under such a configuration, in the power supply system 10 according to the present embodiment, the assembled battery 2 is obtained by connecting n unit cells 8 arbitrarily selected from the plurality of unit cells 8 in series. Output voltage. In this embodiment, the minimum operating voltage of the load 6 is lower than the product of the minimum operating voltage of the unit cell 8 and n.

また、整流器１の出力電圧は、組電池２の満充電電圧以上に設定される。本実施例では、７個の単電池８のうち１個の単電池８が点検又は交換時の予備として用いられるので、整流器１の出力電圧は１３．２［Ｖ］以上に設定される。本実施例では、整流器１は、交流電源５から入力した電力を直流電力に変換して１４．０［Ｖ］の電圧を出力することとする。負荷６への給電は、整流器１と組電池２とから並列に行われる。なお、組電池２の出力にはダイオード３のアノードが接続されているため、組電池２は放電のみ可能であり、整流器１から充電されることはない。   The output voltage of the rectifier 1 is set to be equal to or higher than the fully charged voltage of the assembled battery 2. In the present embodiment, one of the seven unit cells 8 is used as a spare during inspection or replacement, so the output voltage of the rectifier 1 is set to 13.2 [V] or higher. In the present embodiment, the rectifier 1 converts the power input from the AC power source 5 into DC power and outputs a voltage of 14.0 [V]. Power supply to the load 6 is performed in parallel from the rectifier 1 and the assembled battery 2. In addition, since the anode of the diode 3 is connected to the output of the assembled battery 2, the assembled battery 2 can only be discharged and is not charged from the rectifier 1.

また、充電器４の出力電圧は、充電対象の単電池８の満充電電圧に設定される。本実施例では、単電池８と同じ数だけ充電器４が設けられる。そして、各充電器４は、複数の単電池８それぞれに接続され、交流電源５から入力した電力を直流電力に変換して２．２［Ｖ］の電圧を出力し、単電池８の充電を行う。   The output voltage of the charger 4 is set to the full charge voltage of the unit cell 8 to be charged. In this embodiment, the same number of chargers 4 as the unit cells 8 are provided. Each charger 4 is connected to each of the plurality of single cells 8, converts the electric power input from the AC power supply 5 into DC electric power, outputs a voltage of 2.2 [V], and charges the single cell 8. Do.

ここで、本実施例では、７個の単電池８のうち１個の単電池８が点検又は交換時の予備として用いられるので、組電池２の出力電圧は、最高でも満充電電圧の１３．２［Ｖ］である。したがって、組電池２の出力電圧は整流器１の出力電圧（１４．０［０］）より低くなるので、整流器１から出力される電力が優先して負荷６へ供給されることになる。すなわち、交流電源５が有効である限りは、各単電池８は、組電池２に接続されているかどうかに関わらず充電器４により充電され、満充電後も充電器４の出力（２．２Ｖ）により電圧が維持される。   Here, in the present embodiment, one of the seven unit cells 8 is used as a spare for inspection or replacement, so that the output voltage of the assembled battery 2 is 13. 2 [V]. Therefore, since the output voltage of the assembled battery 2 becomes lower than the output voltage (14.0 [0]) of the rectifier 1, the power output from the rectifier 1 is preferentially supplied to the load 6. That is, as long as the AC power supply 5 is valid, each single cell 8 is charged by the charger 4 regardless of whether it is connected to the assembled battery 2, and the output (2.2 V) of the charger 4 even after full charge. ) Maintains the voltage.

例えば、いずれかの単電池８について点検や交換が必要になった場合には、対象の単電池８が組電池２から切離され、替わりに、接続されていない単電池８が組電池２に接続される。切離された単電池８は出力に接続されていないため、取り外されても交流電源５の停電時のバックアップ能力に影響はない。   For example, when any one of the unit cells 8 needs to be inspected or replaced, the target unit cell 8 is disconnected from the assembled battery 2, and instead, the unconnected unit cell 8 is replaced with the assembled battery 2. Connected. Since the detached unit cell 8 is not connected to the output, even if it is removed, there is no effect on the backup capability of the AC power supply 5 during a power failure.

図３は、本実施例に係る電源システム１０における単電池の点検又は交換を説明するための図である。図３に示すように、例えば、組電池２の上から２番目の単電池８の点検又は交換を行なう際には、予備としていた上から１番目の単電池８を組電池２に接続された状態にし、替わりに、上から２番目の単電池８を組電池２から切り離された状態とすればよい。このように、本実施例では、組電池２には常に必要な数の単電池８が接続されながらも、単電池８の切り離しが可能になる。したがって、単電池８の点検や交換に際しても停電時のバックアップ給電が可能になる。   FIG. 3 is a diagram for explaining inspection or replacement of the unit cell in the power supply system 10 according to the present embodiment. As shown in FIG. 3, for example, when checking or replacing the second unit cell 8 from the top of the assembled battery 2, the first unit cell 8 from the top was connected to the assembled battery 2. Instead, the second unit cell 8 from the top may be separated from the assembled battery 2. Thus, in this embodiment, the unit cells 8 can be disconnected while the necessary number of unit cells 8 are always connected to the assembled battery 2. Therefore, backup power supply at the time of a power failure is possible even when the unit cell 8 is inspected or replaced.

上述したように、本実施例に係る電源システム１０は、整流器１と、組電池２と、充電器４とを有する。整流器１は、交流電源５から出力される交流電力を直流電力に変換して負荷６へ供給する。組電池２は、ｎ＋ｍ（ｎ、ｍは自然数）個の複数の単電池８を有し、交流電源５の停電時に負荷６へ直流電力を供給する。充電器４は、交流電源５から出力される交流電力を用いて複数の単電池８それぞれを充電する。そして、組電池２は、複数の単電池８のうち任意に選択されたｎ個の単電池８を直列に接続して得られる電圧を出力する。また、整流器１は、出力電圧が組電池２の満充電電圧以上に設定される。また、充電器４は、出力電圧が充電対象の単電池８の満充電電圧に設定される。   As described above, the power supply system 10 according to the present embodiment includes the rectifier 1, the assembled battery 2, and the charger 4. The rectifier 1 converts AC power output from the AC power source 5 into DC power and supplies the DC power to the load 6. The assembled battery 2 has a plurality of n + m (n and m are natural numbers) unit cells 8 and supplies DC power to the load 6 when the AC power supply 5 is powered off. The charger 4 charges each of the plurality of single cells 8 using AC power output from the AC power supply 5. And the assembled battery 2 outputs the voltage obtained by connecting n unit cells 8 arbitrarily selected from the plurality of unit cells 8 in series. The output voltage of the rectifier 1 is set to be equal to or higher than the fully charged voltage of the assembled battery 2. In addition, the charger 4 has an output voltage set to a full charge voltage of the unit cell 8 to be charged.

すなわち、本実施例では、点検又は交換の対象となる単電池８を切り離す替わりに、予備の単電池８を接続することで、必要な数の単電池８を常に組電池２に接続しつつ、単電池８の点検又は交換を行うことができる。したがって、本実施例によれば、点検や交換のために単電池８が切り離される場合でも、停電時のバックアップ給電を行うことが可能になる。   That is, in this embodiment, instead of disconnecting the unit cell 8 to be inspected or replaced, by connecting the spare unit cell 8, the necessary number of unit cells 8 are always connected to the assembled battery 2. The unit cell 8 can be inspected or replaced. Therefore, according to the present embodiment, even when the unit cell 8 is disconnected for inspection or replacement, it is possible to perform backup power supply during a power failure.

また、本実施例では、負荷６の最低動作電圧は、単電池８の最低使用電圧とｎとの積より低いこととした。したがって、本実施例によれば、負荷６の正常な動作を損なうことなく、停電時のバックアップ給電を行うことが可能になる。   In this embodiment, the minimum operating voltage of the load 6 is lower than the product of the minimum operating voltage of the unit cell 8 and n. Therefore, according to the present embodiment, it is possible to perform backup power supply at the time of a power failure without impairing the normal operation of the load 6.

また、本実施例では、組電池２は、第１の単電池８と第２の単電池とを直列に接続する単極双投スイッチ９を有する。単極双投スイッチ９は、極Ａを極Ｂ及び極Ｃのいずれか一方に接続する構成であって、極Ａが第１の単電池８に接続され、極Ｂが第２の単電池８のプラス極に接続され、第３の極が第１の単電池８のマイナス極に接続される。したがって、本実施例によれば、操作者が単極双投スイッチ９の極を切り換えることで、交換又は点検の対象の単電池８を組電池２から容易に切り離すことができる。また、交換又は点検が完了した単電池８を組電池２に容易に接続することができる。   In the present embodiment, the assembled battery 2 includes a single-pole double-throw switch 9 that connects the first unit cell 8 and the second unit cell in series. The single-pole double-throw switch 9 is configured to connect the pole A to one of the pole B and the pole C. The pole A is connected to the first cell 8 and the pole B is the second cell 8. The third pole is connected to the negative pole of the first cell 8. Therefore, according to the present embodiment, the operator can easily disconnect the unit cell 8 to be replaced or inspected from the assembled battery 2 by switching the pole of the single-pole double-throw switch 9. In addition, the unit cell 8 that has been replaced or inspected can be easily connected to the assembled battery 2.

なお、本実施例では、単電池８として鉛蓄電池を用いた場合について説明したが、本発明はこれに限られるものではない。例えば、リチウムイオン蓄電池などの他の２次電池を単電池８として用いる場合でも、本発明を同様に適用することが可能である。   In addition, although the present Example demonstrated the case where a lead storage battery was used as the single battery 8, this invention is not limited to this. For example, even when another secondary battery such as a lithium ion storage battery is used as the single battery 8, the present invention can be similarly applied.

１０ 電源システム
１ 整流器
２ 組電池
３ ダイオード
４ 充電器
５ 交流電源
６ 負荷
７ バイパス付単電池
８ 単電池
９ 単極双投スイッチ DESCRIPTION OF SYMBOLS 10 Power supply system 1 Rectifier 2 Battery assembly 3 Diode 4 Charger 5 AC power supply 6 Load 7 Cell unit with bypass 8 Unit cell 9 Single pole double throw switch

Claims (3)

交流電源から出力される交流電力を直流電力に変換して負荷へ供給する整流器と、
ｎ＋ｍ（ｎ、ｍは自然数）個の複数の蓄電池を有し、前記交流電源の停電時に前記負荷へ直流電力を供給する組電池と、
前記交流電源から出力される交流電力を用いて前記複数の蓄電池それぞれを充電する充電器とを有し、
前記組電池は、前記複数の蓄電池の中から任意に選択されたｎ個の蓄電池を直列に接続して得られる電圧を出力し、
前記整流器の出力電圧は、前記組電池の満充電電圧以上に設定され、
前記充電器の出力電圧は、充電対象の前記蓄電池の満充電電圧に設定される
ことを特徴とする電源システム。 A rectifier that converts AC power output from an AC power source into DC power and supplies the load to the load;
an assembled battery having a plurality of storage batteries of n + m (n and m are natural numbers) and supplying DC power to the load at the time of a power failure of the AC power supply;
A charger that charges each of the plurality of storage batteries using AC power output from the AC power source;
The assembled battery outputs a voltage obtained by connecting n storage batteries arbitrarily selected from the plurality of storage batteries in series,
The output voltage of the rectifier is set to be equal to or higher than the fully charged voltage of the assembled battery,
The power supply system, wherein an output voltage of the charger is set to a full charge voltage of the storage battery to be charged. 前記負荷の最低動作電圧は、前記蓄電池の最低使用電圧とｎとの積より低いことを特徴とする請求項１に記載の電源システム。   The power supply system according to claim 1, wherein a minimum operating voltage of the load is lower than a product of a minimum operating voltage of the storage battery and n. 前記組電池は、第１の蓄電池と第２の蓄電池とを直列に接続する単極双投スイッチを有し、
前記単極双投スイッチは、第１の極を第２の極及び第３の極のいずれか一方に接続する構成であって、前記第１の極が前記第１の蓄電池に接続され、前記第２の極が第２の蓄電池の一方の極に接続され、前記第３の極が第１の蓄電池の他方の極に接続されることを特徴とする請求項１又は２に記載の電源システム。 The assembled battery has a single-pole double-throw switch that connects the first storage battery and the second storage battery in series,
The single-pole double-throw switch is configured to connect a first pole to one of a second pole and a third pole, the first pole being connected to the first storage battery, The power supply system according to claim 1 or 2, wherein the second pole is connected to one pole of the second storage battery, and the third pole is connected to the other pole of the first storage battery. .
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