JP2009219336A - Dc power system and its charging method - Google Patents

Dc power system and its charging method Download PDF

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JP2009219336A
JP2009219336A JP2008063651A JP2008063651A JP2009219336A JP 2009219336 A JP2009219336 A JP 2009219336A JP 2008063651 A JP2008063651 A JP 2008063651A JP 2008063651 A JP2008063651 A JP 2008063651A JP 2009219336 A JP2009219336 A JP 2009219336A
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battery
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power supply
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supply system
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JP4724726B2 (en
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Riichi Kitano
利一 北野
Takahisa Masashiro
尊久 正代
Akihiro Miyasaka
明宏 宮坂
Akira Yamashita
明 山下
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Nippon Telegraph and Telephone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a DC power-supply system with high power-supply reliability, and to provide its charging method. <P>SOLUTION: The DC power-supply system comprises as structural elements: a rectifier 2; a plurality of combined batteries 5; and a selective charging means 9 for selectively charging the combined batteries 5, wherein the system supplies a DC power outputted from the rectifier 2 to the load 3. The output terminal of a battery system 6 with a plurality of combined batteries 5 connected in series thereto is connected in parallel to a power line from the rectifier 2 to the load 3. When the number of sets of combined batteries 5 constituting one battery system 6 is m, the number of sets of combined batteries 5 synchronously charged in one battery system 6 is n, the output voltage of the rectifier 2 is Vr, and the maximal voltages of a set of combined batteries 5 on charging and discharging are Vc, Vs, respectively, the selective charging means 9 can synchronously charge n sets of combined batteries 5 under the condition of Vr≥Vc×n+Vs×(m-n). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は直流電源システムおよびその充電方法に関する。   The present invention relates to a DC power supply system and a charging method thereof.

一般に、直流負荷装置へ電力を供給する直流電源システムでは、商用交流電力を受け、直流４８Ｖなどの直流電力を出力する整流器が用いられている。さらに、商用電力が停電した場合でも負荷装置への給電を継続するために、整流器の出力側に蓄電池と、蓄電池を充電するための充電器とを備え、バックアップ電源システムとする。蓄電池を直流電源システムに適用する場合には、通常、単セルと呼ばれる１本の蓄電池を複数個直列にしたものを１つ以上並列接続した組電池を用いる。   Generally, in a DC power supply system that supplies power to a DC load device, a rectifier that receives commercial AC power and outputs DC power such as DC 48V is used. Further, in order to continue power supply to the load device even when the commercial power fails, a backup battery system is provided with a storage battery and a charger for charging the storage battery on the output side of the rectifier. When a storage battery is applied to a DC power supply system, an assembled battery in which one or more storage batteries called single cells are connected in parallel is used.

下記特許文献１、２には、複数の組電池が出力する電力を放電器を介して負荷に供給する電池システムが記載され、特許文献１には、組電池と放電器中のコンバータとの間の電路が共通導線によって互いに電気的に接続されていることが記載され、特許文献２には、放電器の各動作を、制御部が発信する同一の動作信号に基づいて行わせることが記載されている。
特開２００７−１４３２６６号公報 特開２００７−１４３２９１号公報 Patent Documents 1 and 2 below describe a battery system that supplies power output from a plurality of assembled batteries to a load via a discharger. Patent Document 1 describes a battery system and a converter in the discharger. Are described as being electrically connected to each other by a common conductor, and Patent Document 2 describes that each operation of the discharger is performed based on the same operation signal transmitted by the control unit. ing.
JP 2007-143266 A JP 2007-143291 A

整流器、電池系列、充電器および放電器を組み合わせた直流電源システムを図４に示す。図において、交流電源１の交流電力は整流器２に供給され、整流器２は交流電力を所定の直流電力に変換して直流５６Ｖを出力し、負荷３（許容電圧範囲：５７Ｖ〜４０．５Ｖ）へ供給している。   FIG. 4 shows a DC power supply system in which a rectifier, a battery series, a charger and a discharger are combined. In the figure, the AC power of the AC power source 1 is supplied to the rectifier 2, and the rectifier 2 converts the AC power into predetermined DC power and outputs DC 56V to the load 3 (allowable voltage range: 57V to 40.5V). Supply.

電池系列６は、複数のニッケル水素蓄電池セル（定格電圧１．２Ｖ）を４０セル直列接続してなる電池系列（定格電圧４８Ｖ）である。電池系列６は、交流電源１が有効であるときは充電器４を介して充電され、交流電源１の停電時に放電器８を介して負荷３への放電を行う。   The battery series 6 is a battery series (rated voltage 48V) formed by connecting 40 nickel-metal hydride storage battery cells (rated voltage 1.2V) in series. The battery series 6 is charged via the charger 4 when the AC power source 1 is active, and discharges to the load 3 via the discharger 8 when the AC power source 1 is powered off.

電池系列６は、充電時、一定電流により充電され、満充電直前には、電池系列６の電圧が６４Ｖに達し、整流器２の出力電圧（５６Ｖ）を上回る。このとき電池系列６から負荷３への放電を防ぐため、放電器８が降圧動作して５５Ｖを出力する。このように、電池系列６の電圧が充電時に整流器２の出力電圧を上回るため、降圧機能を持つ放電器８が必要であるが、電池系列６と負荷３へ至る放電電路に放電器８といった装置が介挿されるため、放電器８の故障により負荷３への給電が不可能となる場合が想定され、システムの給電信頼性が低下するという問題がある。また、整流器２の出力電圧は負荷３の許容上限電圧（５７Ｖ）以下である必要があるから、整流器２の出力電圧を電池系列６の満充電電圧（６４Ｖ）以上とすることはできない。   The battery series 6 is charged with a constant current at the time of charging. The voltage of the battery series 6 reaches 64 V immediately before full charging, and exceeds the output voltage (56 V) of the rectifier 2. At this time, in order to prevent discharge from the battery series 6 to the load 3, the discharger 8 performs a step-down operation and outputs 55V. As described above, since the voltage of the battery series 6 exceeds the output voltage of the rectifier 2 at the time of charging, a discharger 8 having a step-down function is necessary. However, a device such as the discharger 8 is provided in the discharge circuit to the battery series 6 and the load 3. Therefore, there is a problem that power supply to the load 3 becomes impossible due to a failure of the discharger 8 and the power supply reliability of the system is lowered. Further, since the output voltage of the rectifier 2 needs to be equal to or lower than the allowable upper limit voltage (57 V) of the load 3, the output voltage of the rectifier 2 cannot be higher than the full charge voltage (64 V) of the battery series 6.

以上のように、充電時に電池系列の電圧が整流器出力電圧を上回るため、電池系列と負荷の間に降圧のための放電器が必要となり、システムの給電信頼性が低下するという問題がある。   As described above, since the voltage of the battery series exceeds the rectifier output voltage at the time of charging, a discharger for stepping down is required between the battery series and the load, and there is a problem that the power supply reliability of the system is lowered.

本発明は前記の、放電器の介挿により給電信頼性が低下するという問題に鑑みてなされたものであり、本発明が解決しようとする課題は、給電信頼性の高い直流電源システムおよびその充電方法を提供することにある。   The present invention has been made in view of the above-described problem that power supply reliability is lowered due to the insertion of a discharger, and the problem to be solved by the present invention is a DC power supply system with high power supply reliability and its charging. It is to provide a method.

本発明においては、上記課題を解決するために、請求項１に記載のように、
整流器と、複数の組電池と、前記組電池を選択充電する選択充電手段とを具備し、前記整流器が出力する直流電力を負荷へ供給する直流電源システムであって、複数の前記組電池を直列接続してなる電池系列の出力端が前記整流器から前記負荷への給電線に並列接続され、１つの前記電池系列を構成する前記組電池の組数をｍとし、１つの前記電池系列において同時に充電される前記組電池の組数をｎとしたとき、１つの前記電池系列におけるｎ組の前記組電池の同時充電時に、該電池系列の電圧は前記整流器の出力電圧以下に保たれていることを特徴とする直流電源システムを構成する。 In the present invention, in order to solve the above problem, as described in claim 1,
A DC power supply system comprising a rectifier, a plurality of assembled batteries, and selective charging means for selectively charging the assembled batteries, wherein the DC power supply system supplies a DC power output from the rectifier to a load, wherein the plurality of assembled batteries are connected in series. The output terminals of the connected battery series are connected in parallel to the power supply line from the rectifier to the load, and m is the number of the assembled batteries constituting one battery series, and charging is performed simultaneously in one battery series. When the number of assembled battery sets is n, the voltage of the battery series is kept below the output voltage of the rectifier when n sets of the assembled batteries in one battery series are simultaneously charged. A characteristic DC power supply system is configured.

また、本発明においては、請求項２に記載のように、
請求項１に記載の直流電源システムにおいて、前記整流器の出力電圧をＶｒとし、前記組電池１組の、充電時、非充電時の最高電圧を、それぞれ、Ｖｃ、Ｖｓとしたとき、１つの前記電池系列におけるｎ組の前記組電池は、
Ｖｒ≧Ｖｃ×ｎ＋Ｖｓ×(ｍ−ｎ）
なる条件下において、同時に充電されることを特徴とする直流電源システムを構成する。 In the present invention, as described in claim 2,
2. The DC power supply system according to claim 1, wherein the output voltage of the rectifier is Vr, and when the highest voltage during charging and non-charging of one set of the assembled battery is Vc and Vs, respectively, The n sets of batteries in the battery series are:
Vr ≧ Vc × n + Vs × (mn)
The DC power supply system is characterized by being charged at the same time under certain conditions.

また、本発明においては、請求項３に記載のように、
請求項１または２に記載の直流電源システムにおいて、前記選択充電手段には、前記組電池のそれぞれに対して、該組電池のみを充電する充電器が具備されていることを特徴とする直流電源システムを構成する。 In the present invention, as described in claim 3,
3. The DC power supply system according to claim 1, wherein the selective charging means includes a charger that charges only each of the assembled batteries with respect to each of the assembled batteries. Configure the system.

また、本発明においては、請求項４に記載のように、
請求項１または２に記載の直流電源システムにおいて、前記選択充電手段には、充電器と切替え器とが具備され、前記充電器は、前記切替え器を介して、前記組電池を充電することを特徴とする直流電源システムを構成する。 In the present invention, as described in claim 4,
3. The DC power supply system according to claim 1, wherein the selective charging unit includes a charger and a switching device, and the charger charges the assembled battery via the switching device. A characteristic DC power supply system is configured.

また、本発明においては、請求項５に記載のように、
整流器と、複数の組電池と、前記組電池を選択充電する選択充電手段とを具備し、前記整流器が出力する直流電力を負荷へ供給する直流電源システムの充電方法であって、複数の前記組電池を直列接続してなる電池系列の出力端を前記整流器から前記負荷への給電線に並列接続し、１つの前記電池系列を構成する前記組電池の組数をｍとし、１つの前記電池系列において同時に充電される前記組電池の組数をｎとしたとき、１つの前記電池系列の電圧が前記整流器の出力電圧以下となる条件下で該電池系列におけるｎ組の前記組電池を同時に充電することを特徴とする直流電源システムの充電方法を構成する。 In the present invention, as described in claim 5,
A charging method for a DC power supply system, comprising: a rectifier; a plurality of assembled batteries; and selective charging means for selectively charging the assembled batteries, wherein the DC power output from the rectifier is supplied to a load. An output terminal of a battery series formed by connecting batteries in series is connected in parallel to a power supply line from the rectifier to the load, and the number of battery packs constituting one battery series is m, and one battery series When n is the number of battery packs that are simultaneously charged in the battery, n battery packs in the battery battery are simultaneously charged under the condition that the voltage of one battery battery is equal to or lower than the output voltage of the rectifier. A method for charging a DC power supply system is provided.

また、本発明においては、請求項６に記載のように、
請求項５に記載の直流電源システムの充電方法において、前記整流器の出力電圧をＶｒとし、前記組電池１組の、充電時、非充電時の最高電圧を、それぞれ、Ｖｃ、Ｖｓとしたとき、１つの前記電池系列におけるｎ組の前記組電池を、
Ｖｒ≧Ｖｃ×ｎ＋Ｖｓ×(ｍ−ｎ）
なる条件下で同時に充電することを特徴とする直流電源システムの充電方法を構成する。 In the present invention, as described in claim 6,
In the charging method of the DC power supply system according to claim 5, when the output voltage of the rectifier is Vr, and the highest voltage at the time of charging and non-charging of one set of the assembled battery is Vc and Vs, respectively, N sets of the assembled batteries in one battery series,
Vr ≧ Vc × n + Vs × (mn)
The charging method of the DC power supply system is characterized in that charging is performed simultaneously under certain conditions.

また、本発明においては、請求項７に記載のように、
請求項５または６に記載の直流電源システムの充電方法において、前記組電池のそれぞれを、該組電池のみを充電する充電器によって充電することを特徴とする直流電源システムの充電方法を構成する。 In the present invention, as described in claim 7,
7. The charging method for a DC power supply system according to claim 5, wherein each of the assembled batteries is charged by a charger that charges only the assembled battery.

また、本発明においては、請求項８に記載のように、
請求項５または６に記載の直流電源システムの充電方法において、前記組電池を、切替え器を介して、充電器によって充電することを特徴とする直流電源システムの充電方法を構成する。 In the present invention, as described in claim 8,
The charging method for a DC power supply system according to claim 5 or 6, wherein the assembled battery is charged by a charger via a switching device.

本発明に係る直流電源システムおよびその充電方法によれば、組電池の充電時に電池系列の電圧上昇が抑制され、電池系列の電圧は整流器出力電圧を上回らないため、降圧動作のための放電器が必要でなくなり、給電信頼性の高い直流電源システムおよびその充電方法を提供することが可能となる。   According to the DC power supply system and the charging method thereof according to the present invention, the battery system voltage rise is suppressed when charging the assembled battery, and the battery system voltage does not exceed the rectifier output voltage. It becomes unnecessary, and it becomes possible to provide a DC power supply system with high power supply reliability and a charging method thereof.

本発明に係る直流電源システムおよびその充電方法においては、組電池の直列接続により構成された１つの電池系列の組電池を充電するとき、同時に全ての組電池を充電するのではなく、順次、組電池を選択して充電する。   In the DC power supply system and the charging method thereof according to the present invention, when charging an assembled battery of one battery series configured by connecting the assembled batteries in series, not all the assembled batteries are charged at the same time, but the assembled batteries are sequentially assembled. Select and charge the battery.

以下に、本発明の実施の形態について、ニッケル水素蓄電池を用いた直流電源システムを例として説明するが、本発明はこれに限られるものではない。   Hereinafter, embodiments of the present invention will be described by taking a DC power supply system using a nickel-metal hydride storage battery as an example, but the present invention is not limited to this.

図１は、本発明の実施の形態例を説明する図である。図において、整流器２は交流電源１からの交流電力を入力として５６Ｖ（Ｖｒ）の直流電力を出力し、負荷３へ供給する。ニッケル水素蓄電池セル（定格電圧１．２Ｖ、定格容量１００Ａｈ）を１０セル直列接続して組電池５（定格電圧１２Ｖ、定格容量１００Ａｈ）を構成し、さらに組電池５を４組（組電池Ａ、組電池Ｂ、組電池Ｃ、組電池Ｄ）直列接続して電池系列６（定格電圧４８Ｖ、定格容量１００Ａｈ）とする（１電池系列を構成する組電池の組数をｍとすると、この場合ｍ＝４である)。電池系列６は、整流器２から負荷３へ至る給電線に、電池系列６からの放電方向にのみ電力を通すダイオード７を介して並列接続されている。また、それぞれの組電池５に、交流電源１からの交流電力を入力とする充電器４（充電器Ａ、充電器Ｂ、充電器Ｃ、充電器Ｄ）が接続されている。   FIG. 1 is a diagram for explaining an embodiment of the present invention. In the figure, the rectifier 2 receives the AC power from the AC power source 1 and outputs a DC power of 56 V (Vr) and supplies it to the load 3. Nickel metal hydride storage battery cells (rated voltage 1.2V, rated capacity 100Ah) are connected in series to form an assembled battery 5 (rated voltage 12V, rated capacity 100Ah), and four assembled batteries 5 (assembled battery A, The assembled battery B, the assembled battery C, and the assembled battery D) are connected in series to form a battery series 6 (rated voltage 48 V, rated capacity 100 Ah). In this case, m is the number of assembled batteries constituting one battery series. = 4). The battery series 6 is connected in parallel to a power supply line from the rectifier 2 to the load 3 via a diode 7 that passes power only in the discharge direction from the battery series 6. Further, each assembled battery 5 is connected to a charger 4 (charger A, charger B, charger C, charger D) that receives AC power from the AC power supply 1 as an input.

本発明においては、ｍよりも少ない組数（ｎ）の組電池５を選択して充電器４によって同時に充電する。そのための選択充電制御手段（図示せず）が設けられ、この選択充電制御手段と充電器４とが選択充電手段９を構成している。   In the present invention, the number (n) of assembled batteries 5 smaller than m is selected and charged simultaneously by the charger 4. For this purpose, a selective charging control means (not shown) is provided, and the selective charging control means and the charger 4 constitute the selective charging means 9.

電池系列６の充電を、組電池５を１組ずつ選択して充電することにより行う（この場合に、ｎ＝１である)。まず、組電池Ａに接続されている充電器Ａを動作させて充電を行う。組電池Ａが満充電に達した後、充電器Ａを停止させ、充電器Ｂを動作させて組電池Ｂを充電する。以降同様に、組電池Ｃ、組電池Ｄを、それぞれに接続されている充電器４により充電する。このように、組電池Ａから順に満充電まで充電を行い、１つの組電池５が充電されている間は他の組電池５は充電されないようにすることで、電池系列６の電圧上昇は、全ての組電池５を同時に充電する場合より抑制することができる。   The battery series 6 is charged by selecting and charging the assembled batteries 5 one by one (in this case, n = 1). First, charging is performed by operating the charger A connected to the assembled battery A. After the battery pack A reaches full charge, the battery charger A is stopped and the battery charger B is operated to charge the battery pack B. Thereafter, similarly, the assembled battery C and the assembled battery D are charged by the charger 4 connected thereto. In this way, by charging from the assembled battery A to full charge in order, while the other assembled battery 5 is not charged while one assembled battery 5 is being charged, the voltage rise of the battery series 6 is This can be suppressed more than when all the assembled batteries 5 are charged simultaneously.

組電池５は一定電流により充電され、充電されるにしたがって電圧が上昇し、満充電直前には１６Ｖに達するが、充電されていないとき（待機中あるいは放電時）の電圧は１３Ｖ以下である。全ての組電池５を同時に充電する場合、電池系列６の電圧は満充電直前に６４Ｖに達して整流器２の出力電圧（５６Ｖ）を超えてしまう。一方、組電池５を１組ずつ充電する本発明の充電方法では、充電されている１組のみが満充電直前に１６Ｖに達し、他は待機状態で１３Ｖ以下であるため、電池系列６が到達しうる最高電圧は５５Ｖ（１６Ｖ＋１３Ｖ×３）であり、整流器２の出力電圧（５６Ｖ）以下である。   The assembled battery 5 is charged with a constant current, and the voltage increases as it is charged. The voltage reaches 16 V immediately before full charging, but the voltage when not charging (during standby or discharging) is 13 V or less. When all the assembled batteries 5 are charged at the same time, the voltage of the battery series 6 reaches 64 V just before full charging and exceeds the output voltage (56 V) of the rectifier 2. On the other hand, in the charging method of the present invention in which the assembled battery 5 is charged one by one, only one set that has been charged reaches 16V immediately before full charge, and the others are 13V or less in the standby state, so the battery series 6 arrives. The highest possible voltage is 55V (16V + 13V × 3), which is lower than the output voltage (56V) of the rectifier 2.

交流電源１が有効であるとき、各組電池５は前述の充電方法により充電され、整流器２の出力電圧は電池系列６の電圧より高いため整流器２の出力が負荷３へ供給される。交流電源１が停電すると、整流器２が停止し、電池系列６が出力する電力がダイオード７を介して負荷３へ供給される。   When the AC power supply 1 is valid, each assembled battery 5 is charged by the above-described charging method, and the output voltage of the rectifier 2 is higher than the voltage of the battery series 6, so that the output of the rectifier 2 is supplied to the load 3. When the AC power supply 1 fails, the rectifier 2 is stopped and the power output from the battery series 6 is supplied to the load 3 via the diode 7.

以上のように、組電池の直列接続により構成された電池系列を組電池ごとに順次充電を行うことにより、電池系列の最高電圧を整流器出力電圧以下に抑え、降圧を必要としない直流電源システムとすることができる。   As described above, by sequentially charging the battery series configured by the series connection of the assembled batteries for each assembled battery, the maximum voltage of the battery series is suppressed below the rectifier output voltage, and a DC power supply system that does not require step-down can do.

本実施の形態例においては、電池系列６は１系列のみであるが、図２に示すように、複数の電池系列６を整流器２から負荷３への給電線に並列接続した直流電源システムにおいても適用することができる。なお、図２において、選択充電手段９の記載を省略している。   In the present embodiment, there is only one battery series 6, but also in a DC power supply system in which a plurality of battery series 6 are connected in parallel to a feeder line from the rectifier 2 to the load 3 as shown in FIG. Can be applied. In FIG. 2, the description of the selective charging means 9 is omitted.

また、本実施の形態例においては、組電池５にそれぞれ個別の充電器４が接続されているが、図３に示したように、組電池５が個別の充電器４によって充電されるのではなく、共通の充電器４の出力を切替え器１０によって切替えて、組電池５を１組ずつ充電するようにしてもよい。   In the present embodiment, the individual chargers 4 are connected to the assembled batteries 5, but the assembled batteries 5 are not charged by the individual chargers 4 as shown in FIG. Instead, the output of the common charger 4 may be switched by the switch 10 to charge the assembled batteries 5 one by one.

さらに、本実施の形態例においては、同時に充電される組電池５は１組であるが、電池は充電初期の電圧が低く、充電されるにしたがって電圧が上昇するため、電池系列６の電圧が整流器２の出力電圧を超えない限り、複数の組電池５を同時に充電することも可能である。つまり、電池系列６を構成する組電池５の組数をｍ、整流器２の出力電圧をＶｒ、組電池５の充電時最高電圧をＶｃ、組電池５の充電されていないとき（非充電時）の最高電圧をＶｓ、ｎをｍ末満の自然数とすると、
Ｖｒ≧Ｖｃ×ｎ＋Ｖｓ×（ｍ−ｎ）
なる条件が満たされる限り、電池系列６内のｎ組の組電池５を同時に充電することも可能である。このようにすれば、組電池５の充電時における電池系列６の電圧は整流器２の出力電圧以下となる。 Furthermore, in the present embodiment, the number of battery packs 5 that are charged simultaneously is one, but since the voltage of the battery is low at the initial stage of charging and the voltage increases as it is charged, the voltage of battery series 6 is As long as the output voltage of the rectifier 2 is not exceeded, it is also possible to charge the some assembled battery 5 simultaneously. That is, when the number of the assembled batteries 5 constituting the battery series 6 is m, the output voltage of the rectifier 2 is Vr, the maximum voltage when the assembled battery 5 is charged is Vc, and the assembled battery 5 is not charged (during non-charging) If the maximum voltage of Vs is Vs and n is a natural number of m
Vr ≧ Vc × n + Vs × (mn)
As long as the following condition is satisfied, n sets of assembled batteries 5 in the battery series 6 can be charged simultaneously. In this way, the voltage of the battery series 6 when charging the assembled battery 5 becomes equal to or lower than the output voltage of the rectifier 2.

なお、上記の条件が満たされなくても、電池系列６の電圧が整流器２の出力電圧を上回らない限りにおいて、任意の組数の組電池５を同時に充電してもよい。例えば、電池系列６の電圧が５２Ｖ（１組あたり１３Ｖ）に達するまでは４組全ての組電池５を同時に充電し、この後１組ずつ充電を行えばよい。これによって、最初から１組ずつ充電する場合に比べて、充電時間を短縮することができる。   Even if the above conditions are not satisfied, any number of assembled batteries 5 may be charged simultaneously as long as the voltage of the battery series 6 does not exceed the output voltage of the rectifier 2. For example, until the voltage of the battery series 6 reaches 52 V (13 V per set), all four sets of the assembled batteries 5 may be charged at the same time, and thereafter one set may be charged. As a result, the charging time can be shortened compared to the case of charging one set at a time from the beginning.

選択充電手段９の構成要素である選択充電制御手段（図示せず）が、マイコン制御により全組電池５の電圧を検知して、上記の式で表される条件下、あるいは、もっと一般に、電池系列６の電圧が整流器２の出力電圧を上回らないような条件下で組電池５が充電されるように充電制御を行うようにしてよい。この場合に、上記のような自由度の高い充電制御を容易に行うことができる。   A selective charging control means (not shown) which is a component of the selective charging means 9 detects the voltage of all the assembled batteries 5 under microcomputer control, or more generally, the battery Charging control may be performed so that the assembled battery 5 is charged under conditions such that the voltage of the series 6 does not exceed the output voltage of the rectifier 2. In this case, charge control with a high degree of freedom as described above can be easily performed.

以上、本発明の実施の形態について、ニッケル水素蓄電池を用いた直流電源システムを例として説明したが、本発明はこれに限られるものではない。   As described above, the embodiment of the present invention has been described by taking the DC power supply system using the nickel-metal hydride storage battery as an example, but the present invention is not limited to this.

以下に、本発明によって生じる効果について説明する。   Below, the effect produced by this invention is demonstrated.

組電池の直列接続により構成された電池系列を一度に充電するとき、電池系列の電圧が整流器出力電圧を上回るため、電池系列と負荷の間に降圧のための放電器が必要となり、システムの給電信頼性が低下するという問題がある。   When charging a battery series composed of battery packs connected in series at a time, the voltage of the battery series exceeds the output voltage of the rectifier, so a discharger for step-down is required between the battery series and the load. There is a problem that reliability decreases.

本発明により、充電時の電池系列の電圧上昇が抑制され、電池系列の電圧は整流器出力電圧を上回らないため、降圧動作のための放電器が必要なく、給電信頼性の高い電源システムとすることが可能となる。   According to the present invention, the battery system voltage rise during charging is suppressed, and the battery system voltage does not exceed the output voltage of the rectifier, so that a discharger for step-down operation is not required, and a power supply system with high power supply reliability is provided. Is possible.

本発明の実施の形態例を説明する図である。It is a figure explaining the example of embodiment of this invention. 本発明の実施の形態例を説明する図である。It is a figure explaining the example of embodiment of this invention. 本発明の実施の形態例を説明する図である。It is a figure explaining the example of embodiment of this invention. 整流器、電池系列、充電器および放電器を組み合わせた直流電源システムを説明する図である。It is a figure explaining the direct-current power supply system which combined the rectifier, the battery series, the charger, and the discharger.

符号の説明Explanation of symbols

１：交流電源、２：整流器、３：負荷、４：充電器、５：組電池、６：電池系列、７：ダイオード、８：放電器、９：選択充電手段、１０：切替え器。 1: AC power source, 2: rectifier, 3: load, 4: charger, 5: battery pack, 6: battery series, 7: diode, 8: discharger, 9: selective charging means, 10: switcher.

Claims (8)

整流器と、複数の組電池と、前記組電池を選択充電する選択充電手段とを具備し、前記整流器が出力する直流電力を負荷へ供給する直流電源システムであって、
複数の前記組電池を直列接続してなる電池系列の出力端が前記整流器から前記負荷への給電線に並列接続され、１つの前記電池系列を構成する前記組電池の組数をｍとし、１つの前記電池系列において同時に充電される前記組電池の組数をｎとしたとき、１つの前記電池系列におけるｎ組の前記組電池の同時充電時に、該電池系列の電圧は前記整流器の出力電圧以下に保たれていることを特徴とする直流電源システム。 A DC power supply system comprising a rectifier, a plurality of assembled batteries, and selective charging means for selectively charging the assembled batteries, and supplying DC power output from the rectifier to a load,
An output terminal of a battery series formed by connecting a plurality of the assembled batteries in series is connected in parallel to a power supply line from the rectifier to the load, and the number of the assembled batteries constituting one battery series is m. When n is the number of battery packs that are simultaneously charged in one battery series, the voltage of the battery series is equal to or lower than the output voltage of the rectifier when simultaneously charging n battery packs in one battery series. DC power supply system characterized by being maintained at 請求項１に記載の直流電源システムにおいて、
前記整流器の出力電圧をＶｒとし、前記組電池１組の、充電時、非充電時の最高電圧を、それぞれ、Ｖｃ、Ｖｓとしたとき、１つの前記電池系列におけるｎ組の前記組電池は、
Ｖｒ≧Ｖｃ×ｎ＋Ｖｓ×(ｍ−ｎ）
なる条件下において、同時に充電されることを特徴とする直流電源システム。 The DC power supply system according to claim 1,
When the output voltage of the rectifier is Vr and the maximum voltage of the one set of assembled batteries at the time of charging and non-charging is Vc and Vs, respectively, n sets of the assembled batteries in one battery series are:
Vr ≧ Vc × n + Vs × (mn)
A DC power supply system that is charged at the same time under certain conditions. 請求項１または２に記載の直流電源システムにおいて、
前記選択充電手段には、前記組電池のそれぞれに対して、該組電池のみを充電する充電器が具備されていることを特徴とする直流電源システム。 The DC power supply system according to claim 1 or 2,
The direct-current power supply system according to claim 1, wherein the selective charging means includes a charger that charges only each of the assembled batteries. 請求項１または２に記載の直流電源システムにおいて、
前記選択充電手段には、充電器と切替え器とが具備され、前記充電器は、前記切替え器を介して、前記組電池を充電することを特徴とする直流電源システム。 The DC power supply system according to claim 1 or 2,
The selective charging means includes a charger and a switch, and the charger charges the assembled battery via the switch. 整流器と、複数の組電池と、前記組電池を選択充電する選択充電手段とを具備し、前記整流器が出力する直流電力を負荷へ供給する直流電源システムの充電方法であって、
複数の前記組電池を直列接続してなる電池系列の出力端を前記整流器から前記負荷への給電線に並列接続し、１つの前記電池系列を構成する前記組電池の組数をｍとし、１つの前記電池系列において同時に充電される前記組電池の組数をｎとしたとき、１つの前記電池系列の電圧が前記整流器の出力電圧以下となる条件下で該電池系列におけるｎ組の前記組電池を同時に充電することを特徴とする直流電源システムの充電方法。 A charging method for a DC power supply system comprising a rectifier, a plurality of assembled batteries, and selective charging means for selectively charging the assembled batteries, and supplying DC power output from the rectifier to a load,
An output terminal of a battery series formed by connecting a plurality of the assembled batteries in series is connected in parallel to a power supply line from the rectifier to the load, and m is the number of the assembled batteries constituting one battery series. N sets of the assembled batteries in the battery series under the condition that the voltage of one battery series is equal to or lower than the output voltage of the rectifier, where n is the number of the assembled batteries that are charged simultaneously in the battery series. A method for charging a DC power supply system, characterized in that the two are simultaneously charged. 請求項５に記載の直流電源システムの充電方法において、
前記整流器の出力電圧をＶｒとし、前記組電池１組の、充電時、非充電時の最高電圧を、それぞれ、Ｖｃ、Ｖｓとしたとき、１つの前記電池系列におけるｎ組の前記組電池を、
Ｖｒ≧Ｖｃ×ｎ＋Ｖｓ×(ｍ−ｎ）
なる条件下で同時に充電することを特徴とする直流電源システムの充電方法。 In the charging method of the DC power supply system according to claim 5,
When the output voltage of the rectifier is Vr, and the highest voltage of the one set of assembled batteries at the time of charging and non-charging is Vc and Vs, respectively, n sets of the assembled batteries in one battery series,
Vr ≧ Vc × n + Vs × (mn)
A method for charging a DC power supply system, characterized in that charging is performed simultaneously under the following conditions. 請求項５または６に記載の直流電源システムの充電方法において、
前記組電池のそれぞれを、該組電池のみを充電する充電器によって充電することを特徴とする直流電源システムの充電方法。 In the charging method of the DC power supply system according to claim 5 or 6,
A charging method for a DC power supply system, wherein each of the assembled batteries is charged by a charger that charges only the assembled battery. 請求項５または６に記載の直流電源システムの充電方法において、
前記組電池を、切替え器を介して、充電器によって充電することを特徴とする直流電源システムの充電方法。 In the charging method of the DC power supply system according to claim 5 or 6,
A charging method for a DC power supply system, wherein the assembled battery is charged by a charger via a switching device.
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