JPH0295173A - Uninterruptible power supply - Google Patents
Uninterruptible power supplyInfo
- Publication number
- JPH0295173A JPH0295173A JP63244825A JP24482588A JPH0295173A JP H0295173 A JPH0295173 A JP H0295173A JP 63244825 A JP63244825 A JP 63244825A JP 24482588 A JP24482588 A JP 24482588A JP H0295173 A JPH0295173 A JP H0295173A
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- Prior art keywords
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- power supply
- uninterruptible power
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- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 17
- 239000003990 capacitor Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 4
- 230000001934 delay Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は入力交流電源の瞬時停電時などにも安定した交
流出力電力を供給することができる無停電電源装置に係
シ、その出力電流が変化しても負荷へ供給する電圧を安
定化することができる無停電電源装置に関するものであ
る。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an uninterruptible power supply that can supply stable AC output power even during momentary power outages of input AC power. The present invention relates to an uninterruptible power supply that can stabilize the voltage supplied to a load even if its output current changes.
（従来の技術）
無停電電源装置は東芝しビーー４２巻１１号（昭６２年
１１月号） ＰＰ８７７〜８８０などにも紹介されてお
り、その機能、動作概要については公知であるため、こ
こでは第３図を使用して、無停電電源装置の出力電圧制
御方法及び従来技術の問題点を中心に以下説明する。(Prior art) The uninterruptible power supply is introduced in Toshiba Shibee Vol. 42, No. 11 (November 1982 issue), PP877-880, etc., and its functions and operation outline are well known, so they will not be described here. The output voltage control method of the uninterruptible power supply and the problems of the prior art will be explained below with reference to FIG.
第３図において、１ノは入力交流電源、１２は整流器、
１３はインバータ、１４はインバータ変圧器、１５は無
停電電源装置の出力端子、１６はバッテリ、１７はスイ
ッチ、１８はＤＣフィルタコンデンサ、１９はＡＣフィ
ルタコンデンサ、２０は電圧基準設定器、２ノは吊篭圧
検出回路、２２は電圧制御器、２３は周波数制御器、２
４はＰＷＭ制御器、２５はダート増幅器である。In Figure 3, 1 is an input AC power supply, 12 is a rectifier,
13 is an inverter, 14 is an inverter transformer, 15 is an output terminal of the uninterruptible power supply, 16 is a battery, 17 is a switch, 18 is a DC filter capacitor, 19 is an AC filter capacitor, 20 is a voltage standard setter, and 2 is a Hanging cage pressure detection circuit, 22 is a voltage controller, 23 is a frequency controller, 2
4 is a PWM controller, and 25 is a dart amplifier.
この図に示す無停電電源装置の構成で、入力交流電源１
ノの正常時には、これを整流器１２で直流電力に変換し
、ＤＣフィルタコンデンサ１８で平滑してインバータ１
３で交流電力に逆変換し、インバータ変圧器１４及びＡ
Ｃフィルタコンデンサ１９を介して、出力端子１５には
正弦波形の交流電力を供給する。この出力される交流電
力の電圧は電圧基準ｖｒと出力電圧検出回路２１の検出
信号を電圧制御器２２で比較制御し、この出力信号と周
波数制御器２３の出力信号とＰＷＭ制御器２４で合成し
、ダート増幅器２５を介して、インバータ１３の主回路
素子をＰＷＭ制御することによって制御され、出力電圧
は電圧基準２０に、出力周波数は周波数制御器２３によ
って決定されている。In the configuration of the uninterruptible power supply shown in this figure, the input AC power supply 1
During normal operation, this power is converted to DC power by the rectifier 12, smoothed by the DC filter capacitor 18, and then sent to the inverter 1.
3 converts it back to AC power, and inverter transformer 14 and A
Sinusoidal AC power is supplied to the output terminal 15 via the C filter capacitor 19 . The voltage of this output AC power is controlled by comparing the voltage reference vr and the detection signal of the output voltage detection circuit 21 with the voltage controller 22, and then combining this output signal with the output signal of the frequency controller 23 and the PWM controller 24. , the main circuit elements of the inverter 13 are controlled by PWM through the Dart amplifier 25, and the output voltage is determined by the voltage reference 20 and the output frequency by the frequency controller 23.
他方入力交流電源１ノの電圧が落雷や地絡事故などによ
り、例えば定常値の１０％以下に低下すると、入力交流
電源１１からは電力供給を離続することができなくなる
ため、このような場合にはこれを検出してスイッチ１７
を導通させ、バッテリ１６よりスイッチ１７を介して直
流電力を供給する。このように入力交流電源１ノの電圧
低下時にはバッテリ１６より電力を供給することにより
インバーター３及びインバータ変圧器１４を介して出力
端子１５には所定の交流電力を出力することができる。On the other hand, if the voltage of the input AC power source 1 drops to, for example, 10% or less of the steady value due to a lightning strike or a ground fault, the input AC power source 11 will not be able to continue supplying power, so in such a case detect this and switch 17
is made conductive, and DC power is supplied from the battery 16 via the switch 17. In this way, when the voltage of the input AC power supply 1 drops, a predetermined AC power can be outputted to the output terminal 15 via the inverter 3 and the inverter transformer 14 by supplying power from the battery 16.
−船釣にはバッテリー６は５〜１０分程度このような停
電補償することができる。- For boat fishing, the battery 6 can compensate for such a power outage for about 5 to 10 minutes.
無停電電源装置は第３図にその構成を示し、前記説明し
たように出力端子１５には安定した交流電力を供給し、
出力電圧は電圧基準Ｖ と出力電圧検出回路２１の検出
信号を電圧制御器２２で比較制御されるため、この閉ル
ープ制御によって出力端子１５の電圧も電圧基準設定器
２０の設定値ｖｒに従って一定値に制御される。他方無
停電電源装置の負荷は常に一定ではなく変化する。また
負荷の開閉によって負荷電流も急変するため、出力端子
１５の出力′電圧は過渡的に変化する問題があった。第
３図に示すような従来の技術では、負荷電流の変化によ
る無停電電源装置の内部インピーダンスによる電圧降下
や出力端子１５より負荷までの電圧降下を補償するため
に、負荷定格電圧に対し約５％程度出力端子１５の電圧
を上昇させるように電圧基準ｖｒを高く設定するのが一
般的であった。The configuration of the uninterruptible power supply device is shown in FIG. 3, and as explained above, it supplies stable AC power to the output terminal 15,
Since the output voltage is controlled by the voltage controller 22 by comparing the voltage reference V and the detection signal of the output voltage detection circuit 21, the voltage at the output terminal 15 is also kept at a constant value according to the set value vr of the voltage reference setter 20 by this closed loop control. controlled. On the other hand, the load on an uninterruptible power supply is not always constant but changes. Furthermore, since the load current changes suddenly when the load is switched on and off, there is a problem in that the output voltage at the output terminal 15 changes transiently. In the conventional technology as shown in Fig. 3, in order to compensate for the voltage drop due to the internal impedance of the uninterruptible power supply due to changes in load current and the voltage drop from the output terminal 15 to the load, the voltage drop is approximately 5% higher than the load rated voltage. It was common to set the voltage reference vr high so as to increase the voltage at the output terminal 15 by about %.
このように電圧基準Ｖ を設定すると、軽負荷時には負
荷に必要以上の高い電圧が印加され、また、前記過渡的
に出力電流が変化する時には出力端子１５の電圧も過渡
的に約１０％前後急変するなどの欠点が従来の無停電電
源装置では存在した。If the voltage standard V is set in this way, a higher voltage than necessary will be applied to the load when the load is light, and when the output current changes transiently, the voltage at the output terminal 15 will also transiently suddenly change by about 10%. Conventional uninterruptible power supplies have drawbacks such as:
（本発明が解決しようとする課題）
第３図を使用して前述したように、従来技術の無停電電
源装置では定常状態に出力端子１５の電圧は一定に制御
されているが、無停電電源装置に接続される負荷の受電
端でみると次の問題点があった。(Problems to be Solved by the Present Invention) As described above using FIG. 3, in the conventional uninterruptible power supply, the voltage at the output terminal 15 is controlled to be constant in the steady state; When looking at the power receiving end of the load connected to the device, there were the following problems.
（１）無停電電源装置より負荷までの配線の電圧降下に
より、負荷率が変ると電圧変動が生じる。(1) Voltage fluctuations occur when the load factor changes due to a voltage drop in the wiring from the uninterruptible power supply to the load.
（２）前記配線の電圧降下を補償するために、無停電電
源装置の出力端子１５の電圧を前記変圧降下を見込んだ
分だけ上昇させておくと、軽負荷時には負荷側では高い
電圧が供給されることになシ、損失も必要以上に増加す
る。(2) In order to compensate for the voltage drop in the wiring, if the voltage at the output terminal 15 of the uninterruptible power supply is increased by the amount that takes into account the voltage drop, a high voltage will be supplied to the load side during light loads. Moreover, losses will also increase more than necessary.
（３）無停電電源装置の負荷が急変すると、無停電電源
装置内のインピーダンスの影響（出力電圧制御の遅れを
含む）や前記配線の電圧降下の影響によって負荷側での
過渡的な電圧変動が一層大きくなり、負荷が一般的に許
容する±１０％以内の電圧変動をオーバしてしまう危険
性があった。(3) When the load on the uninterruptible power supply suddenly changes, transient voltage fluctuations on the load side may occur due to the impedance within the uninterruptible power supply (including delays in output voltage control) and the voltage drop in the wiring. There was a risk that the voltage fluctuation would become even larger and exceed the voltage fluctuation within ±10% that the load generally allows.
本発明は前述の従来技術の欠点に鑑みてなされたもので
、無停電電源装置の出力電流が変化しても、これに接続
された負荷の受電端の電圧変動を抑制することができる
無停電電源装置を提供することを目的としている。The present invention has been made in view of the drawbacks of the prior art described above, and is an uninterruptible power supply system that is capable of suppressing voltage fluctuations at the receiving end of a load connected to the uninterruptible power supply even if the output current of the uninterruptible power supply changes. The purpose is to provide power supplies.
［発明の構成］
（課題を解決するだめの手段）
本発明はその実施例を第１図や第２図に示すように、無
停電電源装置において、出力端子１５よりの出力電流を
電流検出器２６で検出し、この出力電流の太きさおるい
は出力電流の変化率に対応した補正信号を得て、無停電
電源装置の出力電圧制御ループ内に補正信号として加算
し、無停電電源装置の出力端子１５の電圧を無停電電源
装置の出力電流が増加すれば電圧も増加方向に、前記出
力電流が減少すれば電圧も減少方向に制御する。[Structure of the Invention] (Means for Solving the Problems) As shown in FIG. 1 and FIG. 26, a correction signal corresponding to the thickness of the output current or the rate of change of the output current is obtained, and is added as a correction signal in the output voltage control loop of the uninterruptible power supply. When the output current of the uninterruptible power supply device increases, the voltage at the output terminal 15 of the uninterruptible power supply increases, and when the output current decreases, the voltage decreases.
これによって出力端子１５の電圧を補正し、無停電電源
装置に接続される負荷の受電端の電圧変動を抑制するこ
とができる。This makes it possible to correct the voltage at the output terminal 15 and suppress voltage fluctuations at the receiving end of the load connected to the uninterruptible power supply.
（作用）
本発明の一実施例として示す第１図においては、前述の
補正信号は、出力端子１５の出力電流の大きさに対応し
た補正信号として取シ出し電圧基準ｖｒに等価的に前記
補正信号を加算している。(Function) In FIG. 1 shown as an embodiment of the present invention, the above-mentioned correction signal is equivalent to the correction signal corresponding to the magnitude of the output current of the output terminal 15, and is equivalent to the correction signal corresponding to the output voltage reference vr. Adding signals.
従って無停電電源装置に接続される負荷の受電端では、
定常的な電圧変動を主として抑制することができる。Therefore, at the receiving end of the load connected to the uninterruptible power supply,
Steady voltage fluctuations can mainly be suppressed.
本発明の他の実施例として示す第２図においては、前述
の補正信号は出力端子１５の出力電流の大きさ及び変化
率に対応した補正信号として取シ出し、前記変化率に対
応した補正信号は、無停電電源装置の出力電圧制御ルー
プの大部分の時間遅れを有する電圧制御器２２の出力側
に等価的に加算している。従って無停電電源装置に接続
される負荷の受電端では定常的な電圧変動に加えて過渡
的な電圧変動も抑制することができる。In FIG. 2 shown as another embodiment of the present invention, the above-mentioned correction signal is extracted as a correction signal corresponding to the magnitude and rate of change of the output current of the output terminal 15, and the correction signal corresponding to the rate of change is is equivalently added to the output side of the voltage controller 22 having a time delay of most of the output voltage control loop of the uninterruptible power supply. Therefore, in addition to steady voltage fluctuations, transient voltage fluctuations can also be suppressed at the power receiving end of the load connected to the uninterruptible power supply.
（実施例）
本発明の一実施例を第１図に示す。この図で従来技術の
実施例である第３図と同一番号を符した構成要素は同一
機能の構成要素であるため、説明を省略する。実施例と
して付加した構成要素として、インバータ変圧器１４の
出力側に電流検出器２６および電圧降下検出回路２７を
設けるものである。(Example) An example of the present invention is shown in FIG. Components in this figure that are labeled with the same numbers as in FIG. 3, which is an embodiment of the prior art, have the same functions, so their explanations will be omitted. As components added as an example, a current detector 26 and a voltage drop detection circuit 27 are provided on the output side of the inverter transformer 14.
本発明の第１図の実施例において、無停電電源装置の出
力端子１５の出力電圧は、電圧基準■と、電流検出器２
６を介して電圧降下検出回路２７で検出した電圧降下に
対応した補正信号との等価的な和を基準値として、出力
電圧検出回路２１の検出信号とを電圧制御器２２で比較
制御し、この出力信号により ＰＷＭ制御器２４、ダー
ト増幅器２５を介してインバーター３でＰＷＭ制御して
前記出力電圧制御を行なう。In the embodiment of FIG. 1 of the present invention, the output voltage of the output terminal 15 of the uninterruptible power supply is determined by the voltage reference
Using the equivalent sum of the correction signal corresponding to the voltage drop detected by the voltage drop detection circuit 27 via the voltage drop detection circuit 27 as a reference value, the voltage controller 22 compares and controls the detection signal of the output voltage detection circuit 21. The output voltage is controlled by PWM control by the inverter 3 via the PWM controller 24 and dart amplifier 25 based on the output signal.
この時、電圧降下検出回路２７の補正信号を零とすれば
従来技術と同一となるが、この電気補正信号を出力端子
１５より無停電電源装置に接続される負荷までの電圧降
下に対応した所定レベルとすると、出力端子１５の電流
が増加すると出力端子１５の電圧も上昇し、前記負荷の
受電端での電圧は前記電圧降下の影響が軽減され、電圧
変動が抑制される。また出力端子１５の電流が減少する
と電圧降下検出回路２７の出力する補正信号も減少し、
出力端子１５の電圧も減少して同様の効果が得られる。At this time, if the correction signal of the voltage drop detection circuit 27 is set to zero, it will be the same as the conventional technology, but this electric correction signal will be set to a predetermined value corresponding to the voltage drop from the output terminal 15 to the load connected to the uninterruptible power supply. When the current at the output terminal 15 increases, the voltage at the output terminal 15 also increases, and the influence of the voltage drop on the voltage at the receiving end of the load is reduced, and voltage fluctuations are suppressed. Furthermore, when the current at the output terminal 15 decreases, the correction signal output from the voltage drop detection circuit 27 also decreases.
The voltage at the output terminal 15 is also reduced to achieve a similar effect.
実施例によれば、無停電電源装置の出力端子１５の電圧
がその負荷電流に応じて可変となり、定電圧定周波数の
交流電力を供給する無停電電源装置の目的から外れるが
、無停電電源システムとしてその接続される負荷までを
含めると、負荷の受電端では従来に比しより定電圧定周
波数の交流電力が供給されることになり、無停電電源シ
ステムの本来の目的を達成することができる。この結果
、良質の交流電力が供給されるため、システムとしての
電力損失も減少し、効率も向上することが明らかである
。According to the embodiment, the voltage at the output terminal 15 of the uninterruptible power supply becomes variable according to the load current, which deviates from the purpose of the uninterruptible power supply supplying constant voltage and constant frequency AC power, but the uninterruptible power supply system If the connected load is included, the receiving end of the load will be supplied with more constant voltage and constant frequency AC power than before, making it possible to achieve the original purpose of the uninterruptible power supply system. . As a result, it is clear that since high-quality AC power is supplied, power loss as a system is reduced and efficiency is also improved.
一９＝
本発明の他の実施例を第２図に示す。この図で第１図の
実施例と異なる点は電圧降下検出回路２７の出力側を２
分してその一方に変化率検出器２８を設けた点である。19= Another embodiment of the present invention is shown in FIG. This diagram differs from the embodiment in Figure 1 in that the output side of the voltage drop detection circuit 27 is
The difference is that a change rate detector 28 is provided on one side of the two.
この図において、電圧降下検出回路２７の補正信号は、
一方は第１図と同様に電圧基準２０に等価的に加算され
、他方は変化率検出器２８を介して、電圧制御器２２の
出力側に等価的に加算される。このように構成すると、
出力端子１５の出力電流の増減で出力端子１５の電圧も
増減するが、更に出力端子１５の出力電流が急変した場
合この変化による無停電電源装置の出力電圧制御遅れ（
主として電圧制御器２２の制御遅れや主回路時定数の遅
れ）や出力端子１５に接続される負荷までの配線のりア
クタンスに起因する過渡的な電圧変動を電圧降下検出回
路２７、変化率検出器２８を介して補正し、過渡的な電
圧変動も補償することができる。従って、前記する無停
電電源システムとし１．評価した場合、その負荷受電端
ではより高品質の交流電力が負荷電流急変時にも供給さ
れることになる。In this figure, the correction signal of the voltage drop detection circuit 27 is
One is equivalently added to the voltage reference 20 as in FIG. 1, and the other is equivalently added to the output of the voltage controller 22 via the rate of change detector 28. With this configuration,
The voltage at the output terminal 15 also increases or decreases as the output current at the output terminal 15 increases or decreases, but if the output current at the output terminal 15 suddenly changes, this change will cause a delay in the output voltage control of the uninterruptible power supply (
A voltage drop detection circuit 27 and a rate of change detector 28 detect transient voltage fluctuations caused mainly by control delays of the voltage controller 22 and delays in the main circuit time constant) and the wiring actance to the load connected to the output terminal 15. can also compensate for transient voltage fluctuations. Therefore, the above-mentioned uninterruptible power supply system is adopted as 1. If evaluated, higher quality AC power will be supplied at the load receiving end even when the load current suddenly changes.
本発明の他の実施例を示す第２図においては、電圧降下
検出回路２７の補正信号を電圧基準■に等価的に加算す
る回路を設けているが、この回路を除去して変化率検出
器２８より出力する補正信号のみを等価的に加算するよ
うにしても良い。In FIG. 2 showing another embodiment of the present invention, a circuit for equivalently adding the correction signal of the voltage drop detection circuit 27 to the voltage reference (2) is provided, but this circuit is removed and the rate of change detector is It is also possible to equivalently add only the correction signals output from 28.
また、変化率検出器２８より出力する補正信号の加算点
を本発明では特に限定するものではなく、無停電電源装
置の出力端子１５の電圧制御ループの大部分の遅れを除
去できる制御点に等価的に加算すれば同一効果が得られ
ることは明らかである。Further, the addition point of the correction signal output from the rate of change detector 28 is not particularly limited in the present invention, and is equivalent to a control point that can eliminate most of the delay in the voltage control loop of the output terminal 15 of the uninterruptible power supply. It is clear that the same effect can be obtained by adding them together.
上記各実施例では、出力端子１５の電圧をインバータ１
３０瀧制御で行なう場合を図示して説明したが、出力端
子１５の電圧制御をチョッパを使用してインバータ１３
０入力電圧可変により行なう場合についてもその電圧制
御ループの各機能は等価であるから、本発明が適用でき
ることが明らかである。In each of the above embodiments, the voltage at the output terminal 15 is
Although the case where the control is carried out by 30 waterfall control has been illustrated and explained, the voltage control of the output terminal 15 is performed by using the inverter 13 using a chopper.
Since each function of the voltage control loop is equivalent to the case where 0 input voltage is varied, it is clear that the present invention can be applied.
その他事発明の要旨内において変形例を構成できること
は明らかである。It is clear that other modifications can be made within the scope of the invention.
［本発明の効果］
本発明によれば、無停電電源装置の出力端子の電圧が、
その負荷電流の変化に対応して可変制御され、これに接
続される負荷の受電端ではより電圧変動の少ない又流電
力が供給されることになシ、無停電電源システムの目的
である定電圧定周波数の交流電力を安定に供給すること
ができる。[Effects of the present invention] According to the present invention, the voltage at the output terminal of the uninterruptible power supply is
It is variably controlled in response to changes in the load current, and at the receiving end of the load connected to it, current power with less voltage fluctuation is supplied, which is the purpose of an uninterruptible power supply system. It is possible to stably supply constant frequency AC power.
この結果システム損失も減少するとともに効率も向上し
、より信頼性の高い無停電電源装置を供給できる。As a result, system loss is reduced, efficiency is improved, and a more reliable uninterruptible power supply can be provided.
第１図及び第２図は本発明のそれぞれ異る実施例を示す
ブロック図、第３図は従来の無停電電源装置の構成を示
すブロック図である。
１ノ・・・入力交流電源、１２・・・整流器、１３・・
・インバータ、１４・・・インバータ変圧器、１５・・
・出力端子、１６・・・バッテリ、１７・・・スイッチ
、１８・・・ＤＣフィルタコンデンサ、１９・・・ＡＣ
フィルタコンデンサ、２０・・・電圧基準、２１・・・
出力電圧検出器、２２・・・電圧制御器、２３・・・出
力周波数制御器、２４・・・ＰＷＭ制御器、２５・・・
ダート増幅器、２６・・・電流検出器、２７・・・電圧
降下検出回路、２８・・・変化率検出器。1 and 2 are block diagrams showing different embodiments of the present invention, and FIG. 3 is a block diagram showing the configuration of a conventional uninterruptible power supply. 1... Input AC power supply, 12... Rectifier, 13...
・Inverter, 14... Inverter transformer, 15...
・Output terminal, 16...Battery, 17...Switch, 18...DC filter capacitor, 19...AC
Filter capacitor, 20... Voltage reference, 21...
Output voltage detector, 22... Voltage controller, 23... Output frequency controller, 24... PWM controller, 25...
Dart amplifier, 26... Current detector, 27... Voltage drop detection circuit, 28... Rate of change detector.
Claims (1)
インバータで交流電力に変換して交流電力を出力し、前
記入力交流電源の異常時にはバッテリより直流電力を供
給するようにした無停電電源装置において、該無停電電
源装置の出力電流と関連した補正信号を検出して、この
補正信号を出力電圧を制御する電圧制御ループに等価的
に加算して前記無停電電源装置の出力電圧を可変制御し
、無停電電源装置に接続される負荷の受電端での電圧変
動を抑制したことを特徴とする無停電電源装置。An uninterruptible power supply device that converts AC power from an input AC power source into DC power, converts this into AC power using an inverter, outputs the AC power, and supplies DC power from a battery when the input AC power source is abnormal. , detecting a correction signal related to the output current of the uninterruptible power supply, and equivalently adding this correction signal to a voltage control loop that controls the output voltage to variably control the output voltage of the uninterruptible power supply. An uninterruptible power supply device characterized in that voltage fluctuations at a power receiving end of a load connected to the uninterruptible power supply device are suppressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63244825A JPH0295173A (en) | 1988-09-29 | 1988-09-29 | Uninterruptible power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63244825A JPH0295173A (en) | 1988-09-29 | 1988-09-29 | Uninterruptible power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0295173A true JPH0295173A (en) | 1990-04-05 |
Family
ID=17124513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63244825A Pending JPH0295173A (en) | 1988-09-29 | 1988-09-29 | Uninterruptible power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0295173A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60216772A (en) * | 1984-04-11 | 1985-10-30 | Fuji Electric Co Ltd | Abnormal voltage detector of power converter |
| JPS63220770A (en) * | 1987-03-09 | 1988-09-14 | Toshiba Corp | Controller for cvcf |
-
1988
- 1988-09-29 JP JP63244825A patent/JPH0295173A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60216772A (en) * | 1984-04-11 | 1985-10-30 | Fuji Electric Co Ltd | Abnormal voltage detector of power converter |
| JPS63220770A (en) * | 1987-03-09 | 1988-09-14 | Toshiba Corp | Controller for cvcf |
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