【０００１】[0001]
【産業上の利用分野】本発明は、商用電源が停電した時
には蓄電池からの電力で負荷給電する無停電電源装置に
係り、特別な負荷装置を設けることなく蓄電池の良否を
判定する機能を備えた無停電電源装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply device for supplying a load with electric power from a storage battery when a commercial power supply fails, and has a function of judging the quality of the storage battery without providing a special load device. It relates to an uninterruptible power supply.
【０００２】[0002]
【従来の技術】蓄電池を備え、無瞬断で負荷に給電継続
可能な無停電電源装置（以下、単にＵＰＳと記す）は、
近年の高度情報化社会において、必要不可欠な存在とな
ってきている。又、負荷の機能目的が明確化されつつあ
るのと同時に負荷の種類が増えている現在においては、
無停電電源装置の基本構成においても様々な種類が使用
されている。特殊な無停電電源装置の一例を上げれば、
商用電源から整流器を介して直流電源をそのまま負荷に
給電する直流給電方式の無停電電源装置、又、商用電源
とインバ―タ出力が常時並列接続して運用する並列方式
の無停電電源装置等である。2. Description of the Related Art An uninterruptible power supply (hereinafter simply referred to as UPS) having a storage battery and capable of continuously supplying power to a load without instantaneous interruption is
In recent years, it has become indispensable in the advanced information society. At the same time as the purpose of the load is being clarified and the types of loads are increasing,
Various types are also used in the basic configuration of the uninterruptible power supply. To give an example of a special uninterruptible power supply,
DC power supply type uninterruptible power supply that supplies DC power directly to a load from a commercial power supply via a rectifier, or a parallel type uninterruptible power supply that operates with commercial power supply and inverter output always connected in parallel is there.
【０００３】従来の直流給電方式の無停電電源装置の構
成を図４を用いて説明する。同図において、１は商用電
源、２は交流リアクトル、３はトランジスタ等の半導体
素子で構成され、蓄電池４を充電する機能を有する自励
式コンバ―タ、５は直流電圧を直流負荷６の要求する所
定の電圧を得るための直流／直流コンバ―タ（以下、Ｄ
／Ｄコンバ―タと称する）である。The configuration of a conventional DC power supply type uninterruptible power supply will be described with reference to FIG. In the figure, 1 is a commercial power supply, 2 is an AC reactor, 3 is a semiconductor element such as a transistor, and is a self-exciting converter having a function of charging a storage battery 4, and 5 requires a DC voltage from a DC load 6. DC / DC converter (hereinafter referred to as D
/ D converter).
【０００４】ここで簡単に直流給電方式の無停電電源装
置の動作を説明すると、商用電源１が健全の際には、商
用電源１の交流電力を交流リアクトルを介してコンバ―
タ３にて直流に変換して、この直流電力の一部は蓄電池
４を充電し、その他はＤ／Ｄコンバ―タ５で所定の直流
電圧に変換され直流負荷７に給電される。The operation of the DC power supply type uninterruptible power supply will be briefly described below. When the commercial power supply 1 is healthy, the AC power of the commercial power supply 1 is converted via the AC reactor.
The DC power is converted by the DC / DC converter 3 and a part of the DC power charges the storage battery 4, and the remaining DC power is converted into a predetermined DC voltage by the D / D converter 5 and supplied to the DC load 7.
【０００５】商用電源１が停電の際には、コンバ―タ３
を停止させ、蓄電池４の直流電力をＤ／Ｄコンバ―タ５
にて所定の直流電圧に変換し、所定の放電時間だけ負荷
給電を継続出来るよう無停電化したものである。When the commercial power supply 1 is out of service, the converter 3
Is stopped, and the DC power of the storage battery 4 is transferred to the D / D converter 5.
Is converted into a predetermined DC voltage and is uninterrupted so that the load power supply can be continued for a predetermined discharge time.
【０００６】次にコンバ―タ３の制御回路であるが、図
４に従って説明する。同図において、１１，１２は各々
商用電源、コンバ―タ３の入力電圧の電圧を制御回路レ
ベルの電圧に変換する絶縁変圧器等の交流電圧検出器、
１８は商用電源１の電圧とコンバ―タ３の入力電圧を比
較する比較器、１９は比較器１８の誤差分を比例・積分
して増幅する誤差増幅器、１３は蓄電池４の電圧を絶縁
及び制御回路レベルの電圧に変換する直流電圧検出器、
１５は直流電圧基準、１６は直流電圧基準１５と直流電
圧検出器１３の出力を比較器１４で比較して生じる誤差
分を比例・積分して増幅する誤差増幅器、誤差増幅器１
６の出力はＰＬＬ回路１７の一つの入力となり、商用電
源１の位相基準で動作するＰＬＬ回路１７に対して所定
の位相差を与えることになる。２０は電圧制御回路であ
り、ＰＬＬ回路１７の出力信号により所定の位相基準θ
*及びコンバ―タ３の入力電圧を商用電源１に調節する
ための誤差増幅器１９の出力信号により所定の電圧基準
Ｖ*の二つの入力より所定のパルス列のベ―ス信号に変
換する機能を有している。２１のベ―スドライブ回路
は、ベ―ス信号を絶縁及び増幅し、コンバ―タ３に使用
する半導体素子群を制御するものである。即ち、自励式
コンバ―タは、コンバ―タ３の入力電圧の大きさを調節
することで商用電源１との無効電力を制御し、商用電源
１との位相差、ここでは遅れ位相であるが、これを調節
することで商用電源１との有効電力を制御することが可
能である。Next, the control circuit of the converter 3 will be described with reference to FIG. In the figure, reference numerals 11 and 12 denote an AC voltage detector such as a commercial power supply and an insulation transformer for converting the input voltage of the converter 3 into a voltage of a control circuit level, respectively.
18 is a comparator for comparing the voltage of the commercial power supply 1 with the input voltage of the converter 3, 19 is an error amplifier for amplifying the error of the comparator 18 by proportionally integrating, and 13 is insulating and controlling the voltage of the storage battery 4. DC voltage detector that converts to circuit level voltage,
Reference numeral 15 denotes a DC voltage reference. Reference numeral 16 denotes an error amplifier which compares and amplifies an error generated by comparing the output of the DC voltage detector 13 with the output of the DC voltage detector 13 and proportionally integrates the error.
The output of 6 becomes one input of the PLL circuit 17 and gives a predetermined phase difference to the PLL circuit 17 operating on the phase reference of the commercial power supply 1. Reference numeral 20 denotes a voltage control circuit, which has a predetermined phase reference θ based on an output signal of the PLL circuit 17.
* And a predetermined voltage reference V* by the output signal of the error amplifier 19 for adjusting the input voltage of the converter 3 to the commercial power source 1. It has a function of converting into a base signal of a predetermined pulse train from the two inputs. The base drive circuit 21 is for isolating and amplifying the base signal and controlling the semiconductor element group used in the converter 3. That is, the self-exciting converter controls the reactive power with respect to the commercial power source 1 by adjusting the magnitude of the input voltage of the converter 3, and the phase difference with the commercial power source 1, here the lag phase. By adjusting this, it is possible to control active power with the commercial power supply 1.
【０００７】ここで自励式コンバ―タを使用することの
利点を簡単に説明すれば、一般のサイリスタ式の整流器
とは異り有効電力、無効電力を各々独立に制御出来、入
力力率を１に制御すれば、無停電電源装置の必要入力容
量を最小限に抑えることが可能でであり、又自励式コン
バ―タの半導体素子を所定のパルス幅を持つパルス列
（ＰＷＭ方式と呼ぶ）すれば、商用電源１に発生する高
調波電流を抑えることが可能な点である。To briefly explain the advantage of using the self-exciting converter, unlike the general thyristor rectifier, active power and reactive power can be controlled independently, and the input power factor is 1%. In this case, the required input capacity of the uninterruptible power supply can be minimized, and if the semiconductor element of the self-excited converter is formed into a pulse train having a predetermined pulse width (referred to as a PWM method), Another advantage is that harmonic current generated in the commercial power supply 1 can be suppressed.
【０００８】[0008]
【発明が解決しようとする課題】さてこのような構成か
ら成る無停電電源装置の保守に関して重要な用品は、冷
却ファン等の回転部を有し機械的に動作する部品と、電
解コンデンサ、蓄電池等の化学反応を有する部品であ
る。The important items related to the maintenance of the uninterruptible power supply having the above-mentioned structure include a mechanically operated part having a rotating part such as a cooling fan, an electrolytic capacitor, a storage battery and the like. Is a component having the chemical reaction of
【０００９】特に蓄電池に関しては無停電化のキ―コン
ポ―ネントであり、全体システムに占める設備費用も高
い割りには、その寿命判別が困難であるという問題点を
有している。現在の寿命判別としては、蓄電池の種類に
より期待寿命が製造メ―カから提示されており、その期
待寿命年数に従って蓄電池を交換するようにしている
が、一般的に蓄電池のような化学反応を利用している用
品は、その周囲温度が１０°ｃ上昇すれば寿命は約半分
となり蓄電池の使用環境によって寿命年数が大幅に違っ
てくる。又、実際に使用している蓄電池の寿命を正確に
知る方法として放電試験を行う方法があるが、放電試験
を行うには、所定の負荷設備が必要であり、特に無停電
電源装置の容量が大きくなれば、負荷設備を実運転して
いる現場に持ち込んで放電試験を行うことは事実上不可
能である。[0009] In particular, the storage battery is a key component of uninterruptible power supply, and has a problem that it is difficult to determine the life of the storage battery in spite of the high facility cost in the entire system. As the current life discrimination, the manufacturer expects the expected life depending on the type of the storage battery, and the storage battery is replaced according to the expected number of years of the life, but generally a chemical reaction like the storage battery is used. If the ambient temperature rises by 10 ° C, the life of the used products will be halved, and the number of years will vary greatly depending on the environment in which the storage battery is used. In addition, there is a method of performing a discharge test as a method of accurately knowing the life of the storage battery that is actually used, but in order to perform a discharge test, a predetermined load facility is required, especially when the capacity of the uninterruptible power supply is If it becomes large, it is practically impossible to bring the load equipment to the site where it is actually operating and perform the discharge test.
【００１０】従って、無停電電源装置に使用される蓄電
池は期待寿命年数で交換されることになり、システム環
境によってはまだ実際上数年も使える蓄電池を交換し保
守費用を無駄にしてしまったり、既に寿命となってしま
った蓄電池を使用していて、いざ商用電源１が停電して
負荷７をバックアップする時に、所定のバックアップ時
間を確保できず負荷給電を停止させてしまう危険性が生
じる問題がある。[0010] Therefore, the storage battery used in the uninterruptible power supply is replaced with the expected life, and depending on the system environment, the storage battery that can be used for several years is actually replaced, and the maintenance cost is wasted. When using a storage battery that has already reached the end of its life, and when the commercial power supply 1 fails to backup the load 7, there is a risk of stopping the load power supply because a predetermined backup time cannot be secured. is there.
【００１１】従って、本発明の目的は、前述の点に鑑み
なされたものであって、コンバ―タ及び蓄電池等で構成
される無停電電源装置において、前記蓄電池の交換時期
を判断するための蓄電池の良否を判定するのに特別な設
備を必要とせず、蓄電池の放電能力の低下を判断する機
能を備えた無停電電源装置を提供することにある。Therefore, an object of the present invention is made in view of the above-mentioned points, and in an uninterruptible power supply unit composed of a converter, a storage battery, etc., a storage battery for judging the replacement time of the storage battery. It is an object of the present invention to provide an uninterruptible power supply device that does not require any special equipment to determine the quality of the battery and has a function of determining a decrease in the discharge capacity of the storage battery.
【００１２】[0012]
【課題を解決するための手段】本発明は前記目的を達成
するために、商用電源の正常時に前記商用電源から供給
される交流を直流に変換する自励式コンバータと、蓄電
池を有し、前記商用電源の異常時に前記蓄電池から負荷
へ直流電力を給電継続させる手段を備えた無停電電源装
置において、前記自励式コンバータを前記商用電源に対
して位相を遅らせてコンバータ動作させる第１の位相制
御手段と、位相を進ませてインバータ動作させる第２の
位相制御手段と、前記自励式コンバータがインバータと
して動作する時に前記蓄電池の放電を所定の値に制御す
る手段と、前記蓄電池放電時の蓄電池電圧、放電時間等
のパラメータに基づいて前記蓄電池の良否を判断する手
段を具備したことを特徴とするものである。In order to achieve the above object, the present invention has a self-exciting converter for converting an alternating current supplied from the commercial power source into a direct currentwhen thecommercial power source is normal, and a storage battery. In the uninterruptible power supply device including means for continuingto supplyDC power from the storage battery to the load when the power supply is abnormal, first phase control means for delaying the phase of the self-exciting converter with respect to the commercial power supply and operating the converter. Second phase control means for advancing the phase to operate as an inverter, means for controlling the discharge of the storage battery to a predetermined value when the self-exciting converter operates as an inverter, storage battery voltage during discharge of the storage battery, discharge It is characterized by comprising means for judging the quality of the storage battery based on parameters such as time.
【００１３】[0013]
【作用】前述のように構成することにより、蓄電池の良
否を判定する場合は、コンバ―タをインバ―タ動作させ
て蓄電池を放電させることにより、蓄電池放時の蓄電池
電圧、放電時間等のパラメ―タに基づいて蓄電池の良否
を判定することかできるため蓄電池の正確な交換時期を
判断することが可能になる。According to the above-described configuration, when the quality of the storage battery is determined, the converter is operated to perform an inverter operation to discharge the storage battery, thereby obtaining parameters such as storage battery voltage and discharge time when the storage battery is released. Since it is possible to determine the quality of the storage battery based on the data, it is possible to determine the correct replacement time of the storage battery.
【００１４】[0014]
【実施例】以下本発明の一実施例を図１を参照して説明
する。図１において、従来例である図４と同一番号を付
した構成要素は同一機能の構成要素であるため、その説
明は省略する。An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, since the components having the same numbers as in the conventional example of FIG. 4 have the same functions, the description thereof will be omitted.
【００１５】本実施例図１において、従来例と異なる点
は、直流電流検出器１０を追加して直流電圧検出器１３
の出力と乗算器３１によりそれを積算して蓄電池４の放
電電力を検出するように構成し、直流電力基準３３と比
較器３２で比較し、その誤差を比例・積分する如く誤差
増幅器３４を介してアナログスイッチ３５の一つの入力
として直流電圧一定制御と切換えられるよう構成した点
である。This embodiment FIG. 1 is different from the prior art in that a DC current detector 10 is added and a DC voltage detector 13 is added.
The output of the battery is integrated with the output of the multiplier 31 to detect the discharge power of the storage battery 4, the DC power reference 33 and the comparator 32 are compared, and the error is proportionally and integrated via the error amplifier 34. That is, it is configured such that one input of the analog switch 35 can be switched to DC voltage constant control.
【００１６】更に、アナログスイツチ３５が直流電力一
定制御の誤差増幅器３４側を選択すると同時に蓄電池４
の直流電圧のレベルを監視する蓄電池診断回路３６を設
けた点である。Further, the analog switch 35 selects the side of the error amplifier 34 for DC power constant control, and
In that a storage battery diagnostic circuit 36 for monitoring the level of the DC voltage is provided.
【００１７】次に、本発明の動作について説明する。通
常時にはアナログスイッチ３５は直流電圧一定制御の誤
差増幅器１６側を選択しており、商用電源１の交流電圧
は交流リアクトル２、コンバータ３、Ｄ／Ｄコンバータ
５を介して直流負荷７に給電している。蓄電池４の保守
点検には、アナログスイッチ３５を誤差増幅器１６側か
ら誤差増幅器３４側に切換える。この時ＰＬＬ回路１７
の入力には極性が反転されるように構成し、コンバータ
３は遅れ位相より進み位相に切換り、インバータ動作す
ることになり、蓄電池４の直流電力はＤ／Ｄコンバータ
５を介して負荷給電することに加えて、コンバータ３及
び交流リアクトル２を介して商用電源１に回生される。
ここで蓄電池４の放電量は所定の直流電力基準３３によ
り調節され、任意の電力量に設定することができる。Next, the operation of the present invention will be described. Normally, the analog switch 35 selects the error amplifier 16 side for constant DC voltage control, and the AC voltage of the commercial power supply 1 supplies power to the DC load 7 via the AC reactor 2, the converter 3, and the D / D converter 5. I have. For maintenance and inspection of the storage battery 4, the analog switch 35 is switched from the error amplifier 16 side to the error amplifier 34 side. At this time, the PLL circuit17
The polarity of the input is inverted, the converter 3 switches from the delayed phase to the advanced phase, and operates as an inverter, and the DC power of the storage battery 4 feeds the load through the D / D converter 5. In addition, it is regenerated to the commercial power source 1 via the converter 3 and the AC reactor 2.
Here, the discharge amount of the storage battery 4 is adjusted by a predetermined DC power reference 33 and can be set to an arbitrary power amount.
【００１８】次に蓄電池診断回路３６の構成の説明を図
２を参照して説明する。アナログスイッチ３５が誤差増
幅器３４側に切替わった時点、即ち蓄電池４が所定の電
力量で放電した時点でタイマ―開始するタイマ―３６１
を有し、タイマ―３６１は所定の時間でタイマ―アップ
し、タイマ―動作時にフリップフロップ回路３６５のセ
ットが可能となるように構成するNext, the configuration of the storage battery diagnostic circuit 36 will be described with reference to FIG. A timer-361 that starts a timer when the analog switch 35 is switched to the error amplifier 34 side, that is, when the storage battery 4 is discharged with a predetermined electric energy.
The timer 361 is configured so that the timer is up at a predetermined time and the flip-flop circuit 365 can be set when the timer operates.
【００１９】又、蓄電池診断回路３６の入力である蓄電
池４の直流電圧は、所定の蓄電池電圧基準３６２と比較
器３６３で比較され、前者が後者より小さくなった時に
比較器３６３の出力が有効となりワンショット回路３６
４を介してフリップフロップ回路３６５のセット側入力
となるように構成する。次に、本回路の動作を図３を用
いて説明する。The DC voltage of the storage battery 4 as an input to the storage battery diagnostic circuit 36 is compared with a predetermined storage battery voltage reference 362 by a comparator 363. When the former becomes smaller than the latter, the output of the comparator 363 becomes valid. One shot circuit 36
4 so as to serve as a set-side input of the flip-flop circuit 365 via the input terminal 4. Next, the operation of this circuit will be described with reference to FIG.
【００２０】蓄電池の放電時間−蓄電池電圧特性は図３
の如く示され、蓄電池の劣化が進む程放電カーブは内側
に移動し、同図において蓄電池２は蓄電池１より劣化し
ていると判断できる。ここで仮にタイマー３６１は時間
ｔ0 、蓄電池電圧基準３６２の値をＶB* に設定すると
蓄電池１では、電池電圧が蓄電池電圧基準ＶB* に低下
する時間はｔ1 となり、タイマー設定値ｔ0 より長いた
め、フリップフロップ回路３６５はセットされず警報信
号は出力されない。FIG. 3 shows the discharge time-battery voltage characteristics of the storage battery.
The discharge curve moves inward as the storage battery deteriorates, and it can be determined that the storage battery 2 is more deteriorated than the storage battery 1 in FIG. Here, if the timer 361 sets the time t0 and the value of the storage battery voltage reference 362 to VB* , in the storage battery 1, the time during which the battery voltage drops to the storage battery voltage reference VB* is t1, which is longer than the timer set value t0. The loop circuit 365 is not set and no alarm signal is output.
【００２１】又、蓄電池２では逆に電池電圧が蓄電池電
圧基準ＶB*に低下する時間ｔ2 がｔ0 より短いためフ
リップフロップ回路３６５がセットされ警報信号が出力
されるため、ユ―ザに蓄電池の寿命劣化を知らせること
が可能になる。On the other hand, in the storage battery 2, the battery voltage is equal to the storage battery voltage reference VB*. Since the time t2 at which the power supply falls is shorter than t0, the flip-flop circuit 365 is set and an alarm signal is output, so that the user can be notified of the deterioration of the life of the storage battery.
【００２２】尚、前述の実施例では直流給電方式の無停
電電源装置を例に説明したが、その他並列方式の無停電
電源装置等の構成においても、自励式コンバ―タと蓄電
池を有し、同様の制御回路構成でコンバ―タをインバ―
タ動作させることによって同様の効果を得ることができ
る。In the above-mentioned embodiment, the DC power supply type uninterruptible power supply device has been described as an example. However, other parallel type uninterruptible power supply devices and the like also have a self-exciting converter and a storage battery. Inverter with a similar control circuit configuration
The same effect can be obtained by operating the switch.
【００２３】[0023]
【発明の効果】以上説明したように本発明によれば、商
用電源から供給される交流を直流に変換する自励式コン
バ―タと蓄電池から構成され、前記商用電源の異常時に
蓄電池の電力を用いて負荷給電を継続させる手段を備え
た無停電電源装置において、蓄電池の良否を判定する場
合、自励式コンバ―タをインバ―タ動作させ、蓄電池の
直流電力を所定量で放電させ、同時に蓄電池放電時の蓄
電池電圧、放電時間を監視できるように構成したので、
特別の試験設備を必要とせず短時間に蓄電池の放電試験
を行うことによって蓄電池の交換時期を判断することが
できる。As described above, according to the present invention, a self-exciting converter for converting an alternating current supplied from a commercial power source into a direct current and a storage battery are used, and the power of the storage battery is used when the commercial power source is abnormal. In the uninterruptible power supply equipped with means for continuing the load power supply, when the quality of the storage battery is determined, the self-excited converter is operated as an inverter, and the DC power of the storage battery is discharged by a predetermined amount, and at the same time, the storage battery is discharged. Since the battery voltage and discharge time can be monitored,
It is possible to determine the replacement time of the storage battery by performing a discharge test of the storage battery in a short time without requiring special test equipment.
【図１】本発明の一実施例を示す無停電電源装置のブロ
ック図である。FIG. 1 is a block diagram of an uninterruptible power supply showing one embodiment of the present invention.
【図２】図１における蓄電池診断回路の具体的一例を示
すブロック図。FIG. 2 is a block diagram showing a specific example of a storage battery diagnostic circuit in FIG. 1;
【図３】図２の動作を説明するための蓄電池の放電時間
と電池電圧の特性図。FIG. 3 is a characteristic diagram of a discharge time and a battery voltage of a storage battery for explaining the operation of FIG. 2;
【図４】従来の無停電電源装置のブロック図。FIG. 4 is a block diagram of a conventional uninterruptible power supply device.
１…商用電源 ２…交流リアク
トル ３…コンバ―タ ４…蓄電池 ５…Ｄ／Ｄコンバ―タ ６…直流負荷 １０…直流電流検出器 １１，１２…交流電圧
検出器 １３…直流電圧検出器 １４，１８，３２…加算器 １５…直流電圧基準 １６，１９，３４…誤差増幅
器 １７…ＰＬＬ回路 ２０…弾圧制御
回路 ２１…ベ―スドライブ回路 ３１…乗算器 ３３…直流電力基準 ３５…アナログ
スイッチ ３６…蓄電池診断回路 ３６１…タイマ― ３６２…蓄電池電圧基準 ３６３…抵抗器 ３６４…ワンショット回路 ３６５…フリッ
プフロップ1 ... Commercial power supply 2 ... AC reactor 3 ... Converter 4 ... Storage battery 5 ... D / D converter 6 ... DC load 10 ... DC current detector 11, 12 ... AC voltage detector 13 ... DC voltage detector 14, 18, 32 adder 15 DC voltage reference 16, 19, 34 error amplifier 17 PLL circuit 20 repression control circuit 21 base drive circuit 31 multiplier 33 DC power reference 35 analog switch 36 Storage battery diagnostic circuit 361 ... Timer-362 ... Storage battery voltage reference 363 ... Resistor 364 ... One-shot circuit 365 ... Flip-flop
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3174911AJP2669733B2 (en) | 1991-07-16 | 1991-07-16 | Uninterruptible power system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3174911AJP2669733B2 (en) | 1991-07-16 | 1991-07-16 | Uninterruptible power system |
| Publication Number | Publication Date |
|---|---|
| JPH0530678A JPH0530678A (en) | 1993-02-05 |
| JP2669733B2true JP2669733B2 (en) | 1997-10-29 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3174911AExpired - Fee RelatedJP2669733B2 (en) | 1991-07-16 | 1991-07-16 | Uninterruptible power system |
| Country | Link |
|---|---|
| JP (1) | JP2669733B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2749502B2 (en)* | 1993-09-10 | 1998-05-13 | 富士電機株式会社 | Storage battery quality judgment method for uninterruptible power supply |
| JP2017032452A (en)* | 2015-08-04 | 2017-02-09 | 住友電気工業株式会社 | Abnormality detection method for input voltage and power supply device |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53126120A (en)* | 1977-04-12 | 1978-11-04 | Mitsubishi Electric Corp | No-break power unit |
| JP2533193B2 (en)* | 1989-07-25 | 1996-09-11 | 株式会社東芝 | Storage battery diagnostic method for uninterruptible power supply |
| Publication number | Publication date |
|---|---|
| JPH0530678A (en) | 1993-02-05 |
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