JPH09224381A - Uninterruptible power supply device - Google Patents
Uninterruptible power supply deviceInfo
- Publication number
- JPH09224381A JPH09224381A JP8029514A JP2951496A JPH09224381A JP H09224381 A JPH09224381 A JP H09224381A JP 8029514 A JP8029514 A JP 8029514A JP 2951496 A JP2951496 A JP 2951496A JP H09224381 A JPH09224381 A JP H09224381A
- Authority
- JP
- Japan
- Prior art keywords
- storage battery
- power
- converter
- power supply
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、無停電電源装置
に関し、特にその蓄電池充放電回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply, and more particularly to a storage battery charging / discharging circuit thereof.
【０００２】[0002]
【従来の技術】無停電電源装置は、図３に示すような回
路構成が一般に採られている。すなわち、商用交流電源
電力はコンバ−タ２１により直流電力に変換出力され、
この変換された直流電力はインバ−タ２２により必要と
される所定の周波数及び電圧の交流電力に変換され負荷
に供給される。そして、商用交流電源の停電によりコン
バ−タ２１が出力停止した場合には、コンバ−タ２１に
並列に設けられている蓄電池２３が直ちに放電して、イ
ンバ−タ２２を介して所定の周波数及び電圧の交流電力
が負荷に供給されるよう構成されている。2. Description of the Related Art An uninterruptible power supply generally has a circuit configuration as shown in FIG. That is, the commercial AC power is converted to DC power by the converter 21, and is output.
The converted DC power is converted into AC power having a predetermined frequency and voltage required by the inverter 22 and supplied to the load. Then, when the output of the converter 21 is stopped due to the power failure of the commercial AC power source, the storage battery 23 provided in parallel with the converter 21 is immediately discharged, and the predetermined frequency and the predetermined frequency are supplied via the inverter 22. It is configured such that alternating current power of voltage is supplied to the load.
【０００３】このような構成をとる無停電電源装置にお
いて、商用交流電源の停電によりコンバ−タ２１の出力
が停止し、蓄電池２４から電力が供給され続けると蓄電
池２４の充電量が低下するようになる。このような状況
で、商用交流電源の停電が解消され復電するとコンバ−
タ２１の運転が再開され、コンバ−タ２１は、蓄電池２
４の充電量低下を補うための電力供給とインバ−タへの
電力供給との両方の制御を行なうことになる。In the uninterruptible power supply device having such a configuration, the output of the converter 21 is stopped due to the power failure of the commercial AC power supply, and the amount of charge of the storage battery 24 decreases when the power is continuously supplied from the storage battery 24. Become. In this situation, if the commercial AC power failure is resolved and the power is restored,
The operation of the battery 21 is restarted, and the converter 21 uses the storage battery 2
Both the power supply for compensating the decrease in the charging amount of No. 4 and the power supply to the inverter are controlled.
【０００４】[0004]
【発明が解決しようとする課題】上記のような構成をと
る無停電電源装置のコンバ−タ並びにインバ−タは、コ
ンバ−タ、インバ−タを構成するスイッチング素子のス
イッチング動作により直流電力変換並びに交流電力変換
を行なっている。このスイッチング動作は、コンバ−タ
並びにインバ−タの入出力側にリップル電圧の発生を誘
発する。特にインバ−タにおいて、入力側に対してのリ
ップル電圧が大きく、インバ−タの負荷が大きくなった
場合にはその傾向がさらに顕著になる。このとき、コン
バ−タに並列に接続されている蓄電池は、そのインピ−
ダンスがコンバ−タに比較して小さいので、その影響を
大きく受ける。このため、蓄電池にはコンバ−タから供
給される直流充電電流の他に、先のリップル電圧に基づ
く交流リップル電流が流れることになり、その値は直流
充電電流の数倍の値に達することがある。その結果、蓄
電池内部では、この交流リップル電流と蓄電池の内部抵
抗によって発熱の増大を起こし、この発熱によって蓄電
池が本来有している寿命を著しく損なうという問題があ
った。The converter and the inverter of the uninterruptible power supply having the above-mentioned structure are designed to convert DC power by switching operation of the converter and the switching element which constitutes the inverter. AC power conversion is performed. This switching operation induces the generation of ripple voltage on the input and output sides of the converter and the inverter. Particularly in the inverter, when the ripple voltage on the input side is large and the load of the inverter becomes large, the tendency becomes more remarkable. At this time, the storage battery connected in parallel to the converter has its impedance
Since the dance is smaller than the converter, it is greatly affected. Therefore, in addition to the DC charging current supplied from the converter, an AC ripple current based on the above ripple voltage flows in the storage battery, and its value can reach several times the value of the DC charging current. is there. As a result, inside the storage battery, there is a problem in that the AC ripple current and the internal resistance of the storage battery cause an increase in heat generation, and this heat generation significantly impairs the original life of the storage battery.
【０００５】そこでこの発明は、コンバ−タあるいはイ
ンバ−タで発生するリップル電圧による蓄電池へ流入す
る交流リップル電流を抑制し、蓄電池の寿命を損ねるこ
とがなく、さらに蓄電池からの電力供給の際には供給電
圧の低下が極小の蓄電池充放電回路を有する無停電電源
装置を提供することを目的としたものである。Therefore, the present invention suppresses the AC ripple current flowing into the storage battery due to the ripple voltage generated by the converter or the inverter, without impairing the life of the storage battery, and further when supplying power from the storage battery. The object of the present invention is to provide an uninterruptible power supply having a storage battery charging / discharging circuit in which the supply voltage drop is extremely small.
【０００６】[0006]
【課題を解決するための手段】前述した目的を達成する
ために、この発明のうちで請求項１記載の発明は、交流
電源電力を直流電力に変換出力するコンバ−タと、この
直流電力を交流電力に変換出力し負荷に供給するインバ
−タと、前記コンバ−タに並列に接続される蓄電池充放
電回路から構成される無停電電源装置において、前記蓄
電池回路は、直流リアクトルとダイオ−ドの並列回路
と、この並列回路と直列に接続される蓄電池により構成
し、この直流リアクトルとダイオ−ドによって蓄電池の
充電経路と放電経路をそれぞれ形成したことを特徴とし
たものである。In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is a converter for converting and outputting AC power to DC power, and this DC power In an uninterruptible power supply device comprising an inverter for converting and outputting AC power to supply to a load, and a storage battery charging / discharging circuit connected in parallel to the converter, the storage battery circuit includes a DC reactor and a diode. And a storage battery connected in series with the parallel circuit, and the charging path and the discharging path of the storage battery are formed by the DC reactor and the diode, respectively.
【０００７】また、請求項２記載の発明は、請求項１記
載の発明の構成のうち、ダイオ−ドを商用交流電源の停
電をもって導通するスイッチング素子に代えて並列回路
を構成したことを特徴とする。The invention according to claim 2 is characterized in that, in the configuration of the invention according to claim 1, a parallel circuit is formed by replacing the diode with a switching element which conducts when a commercial AC power source is interrupted. To do.
【０００８】ここで、商用交流電源の停電をもって導通
するとは、商用交流電源の停電が検出され、この検出に
より出力されるゲ−ト信号によって、商用交流電源が停
電している間導通している状態をいう。[0008] Here, "conducting when the commercial AC power source is interrupted" means that the commercial AC power source is detected to be in a power failure state, and the gate signal output by this detection causes the commercial AC power source to conduct during the power failure. State.
【０００９】[0009]
【発明の実施の形態】以下に、この発明にかかる実施の
形態を図面を参照して説明する。図１は、本発明の第１
の実施の形態を示す無停電電源装置の蓄電池充放電回路
であり、同図において、１はコンバ−タで、商用交流電
源よりの交流電力を直流電力に変換出力する順変換器、
２はインバ−タで、コンバ−タ１から出力される直流電
力を必要とする所定の周波数と電圧の交流電力に変換出
力し負荷に交流電力を供給する逆変換器。４は蓄電池
で、商用交流電源が停電し、コンバ−タ１の出力が停止
した時に、コンバ−タ１に代って直流電力をインバ−タ
２に供給する。５は直流リアクトルで、６はダイオ−ド
である。また、Ｃは電解コンデンサである。直流リアク
トル５とダイオ−ド６は並列に接続され並列回路７を構
成し、この並列回路７と蓄電池４とが直列に接続され蓄
電池充放電回路３を構成する。蓄電池充放電回路３は、
コンバ−タ１に並設され、蓄電池４の充電量が不足して
充電電圧が低下しているときには、直流リアクトル５を
介してコンバ−タ１から蓄電池４に充電する充電経路
と、停電によりコンバ−タ１が出力停止しているときに
ダイオ−ド６を介してインバ−タ２に対して放電する放
電経路を形成する。また、ダイオ−ドの接続極性は蓄電
池からの放電経路を可能とする向きに選ばれる。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
Is a storage battery charging / discharging circuit of the uninterruptible power supply showing the embodiment of the present invention, and in the figure, 1 is a converter, which is a forward converter for converting and outputting AC power from a commercial AC power supply to DC power,
Reference numeral 2 is an inverter, which is an inverse converter for converting the DC power output from the converter 1 into AC power of a predetermined frequency and voltage that requires output and supplying the AC power to the load. A storage battery 4 supplies DC power to the inverter 2 in place of the converter 1 when the commercial AC power supply fails and the output of the converter 1 is stopped. Reference numeral 5 is a DC reactor, and 6 is a diode. Further, C is an electrolytic capacitor. The DC reactor 5 and the diode 6 are connected in parallel to form a parallel circuit 7, and the parallel circuit 7 and the storage battery 4 are connected in series to form a storage battery charging / discharging circuit 3. The storage battery charging / discharging circuit 3 is
When the storage battery 4 is installed in parallel with the storage battery 4 and the charging voltage is low, the charging path for charging the storage battery 4 from the converter 1 via the DC reactor 5 and the converter due to a power failure. A discharge path is formed for discharging the inverter 2 through the diode 6 when the output of the inverter 1 is stopped. Further, the polarity of the diode connection is selected so as to allow the discharge path from the storage battery.
【００１０】このような蓄電池充放電回路３を構成する
ことによって、主にインバ−タ２で発生するリップル電
圧による蓄電池４へ流入する交流リップル電流は直流リ
アクトル５によって抑制され、前記リップル電圧も電解
コンデンサＣに充電吸収される。このため、蓄電池４で
は、交流リップル電流による発熱が抑えられ、蓄電池本
来の寿命を損なうことがなくなる。さらに、コンバ−タ
１の出力停止時には蓄電池４より直流電力がダイオ−ド
６を経由してインバ−タ２に供給される。この際、蓄電
池４の放電電流によるダイオ−ド６の電圧降下分は極め
て小さいのでそれによって負荷に供給される交流電圧の
変動は殆どない。By configuring the storage battery charging / discharging circuit 3 as described above, the AC ripple current mainly flowing into the storage battery 4 due to the ripple voltage generated in the inverter 2 is suppressed by the DC reactor 5, and the ripple voltage is also electrolyzed. The capacitor C is charged and absorbed. Therefore, in the storage battery 4, heat generation due to the AC ripple current is suppressed, and the original life of the storage battery is not impaired. Further, when the output of the converter 1 is stopped, DC power is supplied from the storage battery 4 to the inverter 2 via the diode 6. At this time, since the voltage drop of the diode 6 due to the discharge current of the storage battery 4 is extremely small, the AC voltage supplied to the load hardly changes.
【００１１】図２は、本発明の第２の実施例の形態を示
すものであるが、第１の実施例の形態と共通するものに
ついては説明が既になされているので同一の符号を付し
説明を省略する。同図において、８はスイッチング素子
で、ゲ−ト９のゲ−ト信号ａをもって導通する。直流リ
アクトル５とこのスイッチング素子８により並列回路７
を構成する。この並列回路７と蓄電池４が直列接続され
蓄電池充放電回路３が構成され、コンバ−タ１に並列に
接続される。このように構成された蓄電池充放電回路３
のスイッチング素子８を駆動する回路の一例を同図に示
しているが、以下にその駆動回路部分について説明す
る。１１は交流電流検出器で、商用交流電源が停電して
いるかどうかを検出し、停電の際は出力が０となる。１
２はゲ−ト信号制御回路で、交流電流検出器１１の出力
が０になったことを条件にスイッチング素子８のゲ−ト
９にゲ−ト信号ａを出力する。ゲ−ト信号制御回路１２
は商用交流電源と蓄電池４の両者を電源として運転され
る。このように構成されたスイッチング素子８の駆動回
路により、商用交流電源が停電した場合には、交流電流
検出器１１の出力が０になるためにゲ−ト信号制御回路
１２によりゲ−ト信号ａがゲ−ト９に出力され、スイッ
チング素子８が導通状態になる。これにより、蓄電池４
より直流電力がインバ−タ２に供給されるようになる。
商用交流電源の停電が回復し、交流電流検出器１１から
の出力が０でなくなると、ゲ−ト信号制御回路１２はゲ
−ト信号ａの出力を停止するためスイッチング素子８は
遮断され、蓄電池８からの直流電力の供給も停止され
る。FIG. 2 shows a form of the second embodiment of the present invention. The parts common to the form of the first embodiment have been already described and the same reference numerals are given. The description is omitted. In the figure, 8 is a switching element, which is turned on by the gate signal a of the gate 9. The parallel circuit 7 is composed of the DC reactor 5 and the switching element 8.
Is configured. The parallel circuit 7 and the storage battery 4 are connected in series to form a storage battery charging / discharging circuit 3, which is connected in parallel to the converter 1. Storage battery charging / discharging circuit 3 configured in this way
An example of a circuit for driving the switching element 8 is shown in the same figure, and the drive circuit portion thereof will be described below. Reference numeral 11 is an AC current detector, which detects whether or not the commercial AC power supply has a power failure, and the output becomes 0 when the power fails. 1
Reference numeral 2 is a gate signal control circuit, which outputs a gate signal a to the gate 9 of the switching element 8 on condition that the output of the alternating current detector 11 becomes zero. Gate signal control circuit 12
Is operated using both the commercial AC power supply and the storage battery 4 as power supplies. With the drive circuit of the switching element 8 configured as described above, when the commercial AC power supply fails, the output of the AC current detector 11 becomes 0, so that the gate signal control circuit 12 causes the gate signal a. Is output to the gate 9, and the switching element 8 becomes conductive. As a result, the storage battery 4
More DC power is supplied to the inverter 2.
When the commercial AC power supply recovers from the power failure and the output from the AC current detector 11 becomes non-zero, the gate signal control circuit 12 stops the output of the gate signal a, so that the switching element 8 is cut off and the storage battery is discharged. The supply of DC power from 8 is also stopped.
【００１２】[0012]
【発明の効果】以上のように無停電電源装置の蓄電池充
放電回路を構成することによって、特にインバ−タから
発生されるリップル電圧による蓄電池へ流入する交流リ
ップル電流が抑制されるので、交流リップル電流による
発熱を防止することができ蓄電池の寿命を損なうことが
なく、また、蓄電池からインバ−タに直流電力を供給す
る際には電圧低下の極めて少ない直流電力を供給するこ
とができるため、負荷に供給される交流電圧の低下は殆
どない。By constructing the storage battery charging / discharging circuit of the uninterruptible power supply as described above, the AC ripple current flowing into the storage battery due to the ripple voltage generated from the inverter is suppressed. It is possible to prevent heat generation due to current, without impairing the life of the storage battery, and when supplying DC power from the storage battery to the inverter, it is possible to supply DC power with extremely low voltage drop, so There is almost no drop in the AC voltage supplied to.
【図１】本発明の第１の実施例の形態を示す回路図。FIG. 1 is a circuit diagram showing a form of a first embodiment of the present invention.
【図２】本発明の第２の実施例の形態を示す回路図。FIG. 2 is a circuit diagram showing a form of a second embodiment of the present invention.
【図３】従来技術を示す回路図。FIG. 3 is a circuit diagram showing a conventional technique.
１ コンバ−タ ２ インバ−タ ４ 蓄電池 ５ 直流リアクトル ６ ダイオ−ド ８ スイッチング素子 1 Converter 2 Inverter 4 Storage Battery 5 DC Reactor 6 Diode 8 Switching Element
Claims (2)
コンバ−タと、この直流電力を交流電力に変換出力し負
荷に供給するインバ−タと、前記コンバ−タに並列に接
続され前記直流電力の出力が低下したとき、前記コンバ
−タに代って前記インバ−タに直流電力を供給する蓄電
池充放電回路から構成される無停電電源装置において、
前記蓄電池回路は、直流リアクトルとダイオ−ドの並列
回路と、この並列回路と直列に接続される蓄電池により
構成し、前記直流リアクトルによって蓄電池の充電経路
を、前記ダイオ−ドによって蓄電池の放電経路をそれぞ
れ形成したことを特徴とする無停電電源装置。1. A converter for converting and outputting AC power to DC power, an inverter for converting and outputting this DC power to AC power and supplying it to a load, and a DC connected in parallel to the converter. In the uninterruptible power supply device composed of a storage battery charging / discharging circuit that supplies DC power to the inverter instead of the converter when the output of the power decreases,
The storage battery circuit is configured by a parallel circuit of a DC reactor and a diode, and a storage battery connected in series with the parallel circuit, the charging path of the storage battery by the DC reactor, the discharge path of the storage battery by the diode. An uninterruptible power supply characterized by being formed in each case.
の停電をもって導通するスイッチング素子によって前記
並列回路を構成したことを特徴とする請求項１記載の無
停電電源装置。2. The uninterruptible power supply unit according to claim 1, wherein, instead of the diode, the parallel circuit is constituted by a switching element which conducts when a commercial AC power supply fails.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8029514A JPH09224381A (en) | 1996-02-16 | 1996-02-16 | Uninterruptible power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8029514A JPH09224381A (en) | 1996-02-16 | 1996-02-16 | Uninterruptible power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09224381A true JPH09224381A (en) | 1997-08-26 |
Family
ID=12278215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8029514A Pending JPH09224381A (en) | 1996-02-16 | 1996-02-16 | Uninterruptible power supply device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09224381A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010272395A (en) * | 2009-05-22 | 2010-12-02 | Nissan Motor Co Ltd | Motor control device for electric vehicle |
| JP2016135035A (en) * | 2015-01-21 | 2016-07-25 | 株式会社指月電機製作所 | Power control apparatus |
| CN108599353A (en) * | 2018-04-05 | 2018-09-28 | 宁波兆科新能源科技有限公司 | A kind of parallel extended system of high pressure lithium battery energy storage battery cabinet |
-
1996
- 1996-02-16 JP JP8029514A patent/JPH09224381A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010272395A (en) * | 2009-05-22 | 2010-12-02 | Nissan Motor Co Ltd | Motor control device for electric vehicle |
| JP2016135035A (en) * | 2015-01-21 | 2016-07-25 | 株式会社指月電機製作所 | Power control apparatus |
| CN108599353A (en) * | 2018-04-05 | 2018-09-28 | 宁波兆科新能源科技有限公司 | A kind of parallel extended system of high pressure lithium battery energy storage battery cabinet |
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