JPH0937564A - Uninterruptible power supply - Google Patents

Uninterruptible power supply

Info

Publication number
JPH0937564A
JPH0937564A JP7186740A JP18674095A JPH0937564A JP H0937564 A JPH0937564 A JP H0937564A JP 7186740 A JP7186740 A JP 7186740A JP 18674095 A JP18674095 A JP 18674095A JP H0937564 A JPH0937564 A JP H0937564A
Authority
JP
Japan
Prior art keywords
current
inverter
power supply
converter
overcurrent
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.)
Granted
Application number
JP7186740A
Other languages
Japanese (ja)
Other versions
JP3473924B2 (en
Inventor
Kazumasa Matsuoka
一正 松岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP18674095A priority Critical patent/JP3473924B2/en
Publication of JPH0937564A publication Critical patent/JPH0937564A/en
Application granted granted Critical
Publication of JP3473924B2 publication Critical patent/JP3473924B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Inverter Devices (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Rectifiers (AREA)
  • Control Of Voltage And Current In General (AREA)

Abstract

PROBLEM TO BE SOLVED: To make a continuous supply of power to a load without a drop of output voltage or instantaneous cut of power by providing a power supply with an overcurrent controlling means which lowers the output current of an inverter in response to the output of a comparing means and a means which switches a switching circuit to the commercial power supply side. SOLUTION: A device has a comparing circuit 14 which determines whether the current of an inverter 4 reaches a preliminarily set current limit value, an overcurrent controlling circuit 15 which lowers the output current of the inverter 4 immediately after it is detected that the current of the inverter 4 exceeds the set current limit value and the inverter 4 comes to an overcurrent state, and a signal generating circuit 16 which turns on a semiconductor switch 11 when the inverter current reaches the current limit value. When the comparing circuit 14 detects an overcurrent state, the signal generating circuit 16 turns on the semiconductor switch 11 to allow power to be supplied from the commercial power supply. By this method, power is supplied to a load from the inverter until the inverter comes to its limitations and short power is supplied from the commercial power supply. Therefore, power can be continuously supplied to the load without stopping a converter.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、コンバ―タ、イン
バ―タ及び切換回路で構成された無停電電源装置に係
り、特に商用電源との切換を行うことが出来る無停電電
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 unit composed of a converter, an inverter and a switching circuit, and more particularly to an uninterruptible power supply unit capable of switching to a commercial power supply.

【0002】[0002]

【従来の技術】図6は、従来の無停電電源装置の一例を
示すブロック図である。同図において、1は商用電源、
2は交流リアクトル、3はコンバ―タ、4はインバ―
タ、5は平滑コンデンサ、6は制御回路、7は電流検出
器、8はインバ―タトランス、9はフィルタコンデン
サ、10は接触器、11は半導体スイッチ、12は負荷
を示している。
2. Description of the Related Art FIG. 6 is a block diagram showing an example of a conventional uninterruptible power supply device. In the figure, 1 is a commercial power source,
2 is an AC reactor, 3 is a converter, 4 is an inverter
, 5 is a smoothing capacitor, 6 is a control circuit, 7 is a current detector, 8 is an inverter transformer, 9 is a filter capacitor, 10 is a contactor, 11 is a semiconductor switch, and 12 is a load.

【0003】一般に無停電電源装置はこれらに、平滑コ
ンデンサ5と並列に蓄電池が接続されるが、ここでは図
示していない。リアクトル2、コンバ―タ3、インバ―
タ4、平滑コンデンサ5、制御回路6、インバ―タトラ
ンス8及びフィルタコンデンサ9を1組として変換装置
13を構成している。
Generally, in the uninterruptible power supply, a storage battery is connected to these in parallel with the smoothing capacitor 5, but it is not shown here. Reactor 2, converter 3, inverter
The converter 4, the smoothing capacitor 5, the control circuit 6, the inverter transformer 8 and the filter capacitor 9 make up one set.

【0004】接触器10と半導体スイッチ11は、負荷
12への電力供給を変換装置13と商用電源1とのいず
れかに切換えるために用いる。通常は接触器10が変換
装置13側につながっており、負荷12の電力は変換装
置13を通して供給される。変換装置13は制御回路6
により商用電源1に同期運転している。
The contactor 10 and the semiconductor switch 11 are used to switch the power supply to the load 12 to either the converter 13 or the commercial power supply 1. Normally, the contactor 10 is connected to the converter 13 side, and the electric power of the load 12 is supplied through the converter 13. The converter 13 is a control circuit 6
Therefore, the commercial power source 1 is operating synchronously.

【0005】変換装置13を保守点検をする場合もしく
は何等かの原因で変換装置13が故障した場合、動作遅
れの無い半導体スイッチ11を点弧させることにより、
負荷12への電力供給を変換装置13と商用電源1とで
ラップさせ、その後、機械式接点であるために動作遅れ
のある接触器10を変換装置13側から商用電源1側に
切換える。
When the conversion device 13 is inspected for maintenance or when the conversion device 13 fails for some reason, the semiconductor switch 11 having no operation delay is ignited.
The power supply to the load 12 is wrapped by the conversion device 13 and the commercial power supply 1, and then the contactor 10 that has a delay in operation because it is a mechanical contact is switched from the conversion device 13 side to the commercial power supply 1 side.

【0006】変換装置13が故障復旧あるいは保守点検
を終了した場合には、接触器10を商用電源1側から変
換装置13側に切換えて電力供給をラップさせ、半導体
スイッチ11を消弧して、商用電源1側から変換装置1
3側に戻して負荷12へ給電する。これら一例の動作に
より、負荷への電力供給は断続することはない。変換装
置13で電力を供給している期間に、所定レベル以上の
過負荷であることが検出された場合は、特許第1750
086号「インバ―タの保護方法」に示す通り、半導体
スイッチ11を点弧させると同時に、変換装置13の内
のサイリスタの点弧位相を変化させて、出力電圧を商用
電源1の電圧に応じた所定のレベルまで急速に低下させ
て、過負荷状態の電流(モ―タ、トランス等の起動突入
電流等)を商用電源1により供給する。
When the converter 13 completes the failure recovery or maintenance inspection, the contactor 10 is switched from the commercial power source 1 side to the converter 13 side to wrap the power supply, and the semiconductor switch 11 is extinguished. Converter 1 from the commercial power source 1 side
It is returned to the 3 side and power is supplied to the load 12. With the operation of these examples, the power supply to the load is not interrupted. When it is detected that the overload is equal to or higher than a predetermined level during the period in which the conversion device 13 is supplying electric power, Japanese Patent No. 1750
No. 086 “Inverter protection method”, the semiconductor switch 11 is ignited and at the same time the thyristor in the converter 13 is varied in ignition phase so that the output voltage depends on the voltage of the commercial power supply 1. Then, the current is rapidly reduced to a predetermined level, and an overload current (start-up inrush current of a motor, a transformer, etc.) is supplied from the commercial power supply 1.

【0007】[0007]

【発明が解決しようとする課題】しかるにこの方法で
は、変換装置13が停止してはいないが、負荷12への
給電は行っておらず、負荷12への給電は商用電源1の
みに頼ることになるため、無停電電源装置としての信頼
性を向上させることはできない。
However, in this method, although the converter 13 is not stopped, the load 12 is not fed, and the load 12 is fed only by the commercial power source 1. Therefore, the reliability as an uninterruptible power supply cannot be improved.

【0008】又、インバ―タ電流を絞る手段は、サイリ
スタを用いた点弧角制御であるため、インバ―タ電流を
瞬時に絞ることはできない。この方法では、変換装置1
3内のインバ―タ4を構成する素子がサイリスタであ
り、その点弧角制御して出力電圧を制御している。変換
装置13が負荷側の過電流のため電力供給をやめ、商用
電源1に切換わる時、サイリスタを用いた点弧角制御で
は、3.3ms(HZ 時)以上の高速な切換えは行えな
い。例えば1相のゲ―トがONした直後に過電流を検出
したとしても、3.3msの間はゲ―トブロック(G
B)を行うことはできない。ことため、商用電源1に切
換わる際に、3.3ms幅の負荷側の電圧低下が発生す
る。従って、最悪の場合、この切換えのために、瞬断が
発生し無停電電源装置として機能しないことがある。
Further, since the means for reducing the inverter current is the firing angle control using the thyristor, the inverter current cannot be instantaneously reduced. In this method, the conversion device 1
The element forming the inverter 4 in 3 is a thyristor, and its firing angle is controlled to control the output voltage. When the converter 13 stops the power supply due to the overcurrent on the load side and switches to the commercial power source 1, the ignition angle control using the thyristor cannot perform high-speed switching of 3.3 ms (at HZ) or more. For example, even if an overcurrent is detected immediately after the 1-phase gate is turned on, the gate block (G
B) cannot be performed. Therefore, when switching to the commercial power source 1, a voltage drop on the load side of 3.3 ms width occurs. Therefore, in the worst case, due to this switching, a momentary interruption may occur and the UPS may not function.

【0009】本発明では、インバ―タを構成するスイッ
チング素子を高速なスイッチングが可能なIGBTのよ
うな素子を用いて、且つインバ―タ制御をPWM制御等
の高速制御を用いることにより、変換装置13が負荷側
の過電流を検出した場合、瞬時にゲ―トブロックを行
い、商用電源1に切換える。例えばPWM制御周期を7
kHZ とすると、各相のゲ―トのON,OFFは142
μsで実施されるため、スイッチング直後の過電流検出
に対しても、142μsしかゲ―トブロックが遅れるこ
とはない。上記のサイリスタ制御に用いる点弧角制御
(3.3ms)と比較すると負荷側の電圧低下は微小で
あり、瞬断による影響を負荷に与えることはない。 そ
こで本発明の目的は、前述の点に鑑みなされたもので、
変換装置13が電力供給している期間に、負荷投入や負
荷側の短絡による所定レベル以上の過電流を検出した場
合でも、インバ―タ電流を瞬時に所定範囲内に絞ること
により、インバ―タを高速なスイッチングが可能なIG
BT等の素子で構成することと、インバ―タの制御をP
WM制御等の高速制御を用いることにより、インバ―タ
から過大な電流が流れることを抑えかつ切換回路のサイ
リスタスイッチをONさせることにより、負荷電圧を保
つことが可能となり、出力電圧の一周期以内の短時間の
過電流に対しても有効となり、変換装置を故障、保護停
止させることなく、かつ出力電圧の低下や瞬断のない負
荷給電を継続する無停電電源装置を提供することを目的
とする。
According to the present invention, the conversion device is constituted by using an element such as an IGBT capable of high-speed switching as a switching element forming the inverter and using high-speed control such as PWM control for the inverter control. When 13 detects an overcurrent on the load side, it immediately performs gate blocking and switches to the commercial power supply 1. For example, the PWM control cycle is 7
If the frequency is kHz, the gate ON / OFF of each phase is 142
Since it is performed in .mu.s, the gate block is delayed by 142 .mu.s even when the overcurrent is detected immediately after switching. Compared with the ignition angle control (3.3 ms) used for the above thyristor control, the voltage drop on the load side is very small, and the influence of momentary interruption does not affect the load. Therefore, the object of the present invention was made in view of the above points,
Even when an overcurrent exceeding a predetermined level due to load application or a short circuit on the load side is detected while the converter 13 is supplying electric power, the inverter current is instantly narrowed to within a predetermined range, and IG capable of high-speed switching
P is composed of elements such as BT and control of the inverter.
By using high-speed control such as WM control, it is possible to suppress the flow of excessive current from the inverter and to turn on the thyristor switch of the switching circuit, so that the load voltage can be maintained and within one cycle of the output voltage. With the aim of providing an uninterruptible power supply that is also effective against short-time overcurrent, and that does not stop the converter and stop protection, and that can continue load power supply without output voltage drop or instantaneous interruption. To do.

【0010】[0010]

【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、請求項1に記載の発明は、商用電源から供
給される交流を直流に変換するコンバ―タと、該コンバ
―タの直流を交流に変換するインバ―タから成る変換装
置の出力と、前記商用電源のいずれかを切換回路で選択
して負荷に給電するようにした無停電電源装置におい
て、前記インバ―タの電流を検出する電流検出手段と、
この電流検出手段の出力が所定の値を超えて過電流とな
ったことを検出する比較手段と、該比較手段に応答し過
電流時に前記インバ―タの出力電流を絞る過電流制御手
段と、前記比較手段に応答し前記切換回路を前記変換装
置側から前記商用電源側へ切換える手段とを備えたこと
を特徴とする。
In order to achieve the above object, the present invention provides a converter for converting an alternating current supplied from a commercial power source into a direct current, and the converter. In the uninterruptible power supply unit configured to select the output of the converter composed of the inverter for converting the direct current into the alternating current and the commercial power supply by the switching circuit to supply power to the load, the current of the inverter Current detection means for detecting
Comparing means for detecting that the output of the current detecting means exceeds a predetermined value and becoming an overcurrent, and overcurrent controlling means for responding to the comparing means and reducing the output current of the inverter at the time of overcurrent, Means for switching the switching circuit from the converter side to the commercial power source side in response to the comparing means.

【0011】又、請求項2に記載の発明は、商用電源か
ら供給される交流を直流に変換するコンバ―タと、該コ
ンバ―タの直流を交流に変換するインバ―タから成る変
換装置の出力と、前記商用電源のいずれかを切換回路で
選択して負荷に給電するようにした無停電電源装置にお
いて、前記インバ―タの電流を検出する電流検出手段
と、この電流検出手段の出力が所定の値を超えて過電流
となったことを検出する比較手段と、該比較手段に応答
し過電流時に前記インバ―タの出力電流を絞る過電流制
御手段と、前記インバ―タが力行か回生かを判断する判
定手段と、該判定手段及び前記比較手段に応答し過電流
状態で且つ力行状態の条件で前記切換回路を前記変換装
置側から前記商用電源側へ切換える手段とを備えたこと
を特徴とする。
The invention according to claim 2 is a converter comprising a converter for converting an alternating current supplied from a commercial power source into a direct current and an inverter for converting a direct current of the converter into an alternating current. In an uninterruptible power supply in which either the output or the commercial power supply is selected by a switching circuit to supply power to a load, current detection means for detecting the current of the inverter and output of the current detection means Comparison means for detecting that an overcurrent has exceeded a predetermined value, overcurrent control means for responding to the comparison means to throttle the output current of the inverter at the time of overcurrent, and whether the inverter is powered. And a means for responding to the determining means and the comparing means for switching the switching circuit from the converter side to the commercial power source side under an overcurrent condition and a power running condition. Is characterized by.

【0012】更に、請求項3に記載の発明は、商用電源
から供給される交流を直流に変換するコンバ―タと、該
コンバ―タの直流を交流に変換するインバ―タから成る
変換装置の出力と、前記商用電源のいずれかを切換回路
で選択して負荷に給電するようにした無停電電源装置に
おいて、前記インバ―タの電流を検出する電流検出手段
と、この電流検出手段の出力が所定の値を超えて過電流
となったことを検出する比較手段と、該比較手段に応答
し過電流時に前記インバ―タの出力電流を絞る過電流制
御手段と、前記比較手段及び前記負荷の投入或いは負荷
の追加投入される前に得られる負荷状態変化信号に応答
し前記切換回路を前記変換装置側から前記商用電源側へ
切換える手段とを備えたことを特徴とする。
Further, a third aspect of the present invention is a converter comprising a converter for converting alternating current supplied from a commercial power source into direct current and an inverter for converting direct current of the converter into alternating current. In an uninterruptible power supply in which either the output or the commercial power supply is selected by a switching circuit to supply power to a load, current detection means for detecting the current of the inverter and output of the current detection means Comparing means for detecting an overcurrent exceeding a predetermined value, overcurrent control means for responding to the comparing means to throttle the output current of the inverter at the time of overcurrent, and comparing means and the load. And a means for switching the switching circuit from the converter side to the commercial power source side in response to a load state change signal obtained before turning on or adding a load.

【0013】更に又、請求項4に記載の発明は、商用電
源から供給される交流を直流に変換するコンバ―タと、
該コンバ―タの直流を交流に変換するインバ―タから成
る変換装置を複数台並列接続し、該並列接続された複数
台の変換装置の出力と、前記商用電源のいずれかを切換
回路で選択して負荷に給電するようにした無停電電源装
置に於て、前記各変換装置はインバ―タの電流を検出す
る電流検出手段と、この電流検出手段の出力が所定の値
を超えて過電流となったことを検出する比較手段と、該
比較手段に応答し過電流時に前記インバ―タの出力電流
を絞る過電流制御手段を具備し、前記それぞれの比較手
段の出力が印加され、複数台のインバ―タの内、半数以
上のインバ―タが過電流状態の時に前記切換回路を前記
並列接続された複数台の変換装置側から前記商用電源側
へ切換える手段とを備えたことを特徴とする。
Further, the invention according to claim 4 is a converter for converting an alternating current supplied from a commercial power source into a direct current,
A plurality of converters each including an inverter for converting direct current of the converter into alternating current are connected in parallel, and the output of the plurality of converters connected in parallel and one of the commercial power supplies are selected by a switching circuit. In the uninterruptible power supply device configured to supply power to the load, each of the conversion devices detects current of the inverter and current detection means, and the output of the current detection means exceeds a predetermined value to generate an overcurrent. And comparing means for detecting that the output current of the inverter is reduced when an overcurrent occurs in response to the comparing means, and the output of each of the comparing means is applied to a plurality of units. Of the inverters, a means for switching the switching circuit from the plurality of conversion devices connected in parallel to the commercial power supply side when more than half of the inverters are in an overcurrent state is provided. To do.

【0014】[0014]

【発明の実施の形態】以下本発明を図1乃至図5を参照
して説明する。図1は、請求項1に記載の発明の一実施
例を示す構成図で、図6と同一機能を備えたものには同
一符号を付しており、その説明を省略する。
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing an embodiment of the invention described in claim 1. Components having the same functions as those in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted.

【0015】図1は、図6に、インバ―タ4の電流が予
め設定した電流制限値に達したかどうかを判定する比較
回路14と、インバ―タ4の電流が予め設定した電流制
限値を超えて過電流状態となったことが前記比較回路1
4で検出された時にインバ―タ4の出力電流を瞬時に絞
る過電流制御回路15と、インバ―タ電流が電流制限値
に達した場合に、半導体スイッチ11をタ―ンオンさせ
るための信号を発生する信号発生回路16が追加されて
いる。
FIG. 1 shows a comparison circuit 14 for determining whether or not the current of the inverter 4 has reached a preset current limit value in FIG. 6, and the current of the inverter 4 has a preset current limit value. When the overcurrent condition is exceeded, the comparison circuit 1
4, an overcurrent control circuit 15 that instantaneously throttles the output current of the inverter 4 when it is detected, and a signal for turning on the semiconductor switch 11 when the inverter current reaches the current limit value. A signal generating circuit 16 for generating is added.

【0016】比較回路14は、電流検出器7で検出した
インバ―タ電流が電流制限値にあることを検出する。
又、過電流制御回路15は、インバ―タ電流を瞬時に絞
るための過電流制御を行う。これは例えば、制御回路6
の中で、電圧制御や電流制御をPI制御で実施している
場合、この積分動作を一定期間ホ―ルドする機能を有す
る。信号発生回路16は、比較回路14が過電流検出状
態の時、半導体スイッチ11をオンして、商用電源1か
ら給電可能な状態とする。
The comparison circuit 14 detects that the inverter current detected by the current detector 7 is within the current limit value.
Further, the overcurrent control circuit 15 performs overcurrent control for instantaneously reducing the inverter current. This is, for example, the control circuit 6
Among them, when the voltage control or the current control is performed by PI control, it has a function of holding this integration operation for a certain period. When the comparison circuit 14 is in the overcurrent detection state, the signal generation circuit 16 turns on the semiconductor switch 11 so that power can be supplied from the commercial power supply 1.

【0017】過負荷時に商用電源1から負荷電流の内、
インバ―タ電流に対する不足分の電力を供給可能な状態
とすることにより、負荷電圧は商用電源1により維持さ
れ、変換装置13を停止させることもない。この動作に
よって、インバ―タ4は限界能力の電流までは負荷12
へ電力を供給し、不足分は商用電源1から供給されるこ
とになるため、変換装置13を停止させずに負荷12へ
の電力給電を継続することが可能となり、無停電電源装
置としての電力供給の信頼性を改善することができる。
Of the load current from the commercial power source 1 at the time of overload,
The load voltage is maintained by the commercial power source 1 and the converter 13 is not stopped by making it possible to supply the power shortage with respect to the inverter current. By this operation, the inverter 4 loads the load 12 up to the current of the limit capacity.
Power is supplied to the load 12, and the shortage is supplied from the commercial power supply 1. Therefore, the power supply to the load 12 can be continued without stopping the conversion device 13, and the power as an uninterruptible power supply device can be obtained. The reliability of supply can be improved.

【0018】次に、請求項2に記載の発明の一実施例を
図1と同一部に同一符号を付して示す図2を参照して説
明する。図2において、インバ―タ4の電流が予め設定
した電流制限値に達したかどうかを判定する比較回路1
4と、電流過大時にインバ―タ電流を瞬時に絞る過電流
制御回路15と、インバ―タ電流絞りの条件の下でイン
バ―タ電流が力行か回生かを判定する判定回路17と、
インバ―タ電流が電流制限値に達し、インバ―タ4が力
行時に、半導体スイッチ11をオンする信号発生回路1
6を設けている。
Next, an embodiment of the invention described in claim 2 will be described with reference to FIG. 2 in which the same parts as those in FIG. In FIG. 2, a comparison circuit 1 for determining whether or not the current of the inverter 4 has reached a preset current limit value.
4, an overcurrent control circuit 15 that instantaneously throttles the inverter current when the current is excessive, and a determination circuit 17 that determines whether the inverter current is running or regenerated under the conditions of the inverter current throttling.
A signal generation circuit 1 for turning on the semiconductor switch 11 when the inverter current reaches the current limit value and the inverter 4 is in power running.
6 is provided.

【0019】図2のように構成された請求項2の発明
は、インバ―タ4の電流を電流検出器7で検出し、イン
バ―タ4から負荷12への電力が力行か回生かを判定す
る判定回路17により、負荷12から変換装置13側に
電力が回生されている場合は、半導体スイッチ11をオ
ンしない信号、インバ―タ4から負荷12へ電力を供給
しているときのみ、半導体スイッチ11をオンする信号
を出力する。信号発生回路16は、インバ―タ電流が電
流制限値に達し、且つインバ―タ電流がインバ―タ4か
ら負荷12へ流れる場合にのみ半導体スイッチ11を商
用電源1側から給電可能な状態とする。インバ―タ4か
ら負荷12への力行状態のときに、図1の回路と等価と
なり同様の効果が期待できる。
According to the second aspect of the present invention configured as shown in FIG. 2, the current of the inverter 4 is detected by the current detector 7 to determine whether the power from the inverter 4 to the load 12 is power running or regenerative. When the electric power is regenerated from the load 12 to the converter 13 side by the determination circuit 17, the signal that does not turn on the semiconductor switch 11, the semiconductor switch is supplied only when the electric power is supplied from the inverter 4 to the load 12. A signal for turning on 11 is output. The signal generating circuit 16 sets the semiconductor switch 11 in a state in which power can be supplied from the commercial power source 1 side only when the inverter current reaches the current limit value and the inverter current flows from the inverter 4 to the load 12. . In the power running state from the inverter 4 to the load 12, the circuit becomes equivalent to the circuit of FIG. 1 and the same effect can be expected.

【0020】図3は請求項2に記載の発明の他の実施例
を示す構成図である。図2の実施例は、インバ―タ4が
力行か回生かの判断をインバ―タ4の出力電流を検出し
て行っているが、図3に示すように、負荷12の入力電
流を検出して行なっても同様の効果を得ることができ
る。
FIG. 3 is a block diagram showing another embodiment of the invention described in claim 2. In FIG. In the embodiment of FIG. 2, whether the inverter 4 is in power running or regenerative is determined by detecting the output current of the inverter 4, but as shown in FIG. 3, the input current of the load 12 is detected. The same effect can be obtained even if it is performed.

【0021】負荷12の電流を電流検出器18で検出
し、負荷電流が変換装置13から負荷12への電力が力
行か回生かを判定する判定回路19により、負荷12か
ら変換装置13側に電力が回生されている場合は、半導
体スイッチ11をオンしない信号、変換装置13から負
荷12へ電力を供給しているときのみ、半導体スイッチ
11をオンさせる信号を信号発生回路16に送る。信号
発生回路16は、インバ―タ電流が電流制限値に達し、
且つ負荷電流が変換装置13から負荷12へ流れる場合
にのみ半導体スイッチ11を商用電源1側から給電可能
な状態とする。変換装置13から負荷12への力行状態
のときに、図1の回路と等価となり同様の効果が期待で
きる。
The load detector 12 detects the current of the load 12 by the current detector 18, and the load current is transferred from the load 12 to the converter 13 side by the judgment circuit 19 which judges whether the power from the converter 13 to the load 12 is power running or regenerative. Is being regenerated, a signal for not turning on the semiconductor switch 11 and a signal for turning on the semiconductor switch 11 are sent to the signal generating circuit 16 only when power is being supplied from the converter 13 to the load 12. In the signal generation circuit 16, the inverter current reaches the current limit value,
Moreover, only when the load current flows from the converter 13 to the load 12, the semiconductor switch 11 is brought into a state in which power can be supplied from the commercial power source 1 side. In the powering state from the converter 13 to the load 12, the circuit becomes equivalent to the circuit of FIG. 1 and the same effect can be expected.

【0022】次に、請求項3に記載の発明の一実施例を
図2と同一部に同一符号を付して示す図4を参照して説
明する。図4において、インバ―タ4の電流が予め設定
した電流制限値に達したかどうかを判定する比較回路1
4と、この比較回路14に応答し、インバ―タ4電流が
過電流状態である時に、インバ―タ電流を瞬時に絞る過
電流制御回路15と、比較回路14に応答し、インバ―
タ電流が電流制限値に達して過電流状態となっている時
に、半導体スイッチ11をオンにする指令信号を信号発
生回路16に与える判定回路21と、更に、この判定回
路21に、負荷12の投入或いは負荷12の追加投入さ
れる前に得られる負荷状態変化信号を印加する。
Next, an embodiment of the invention described in claim 3 will be described with reference to FIG. 4, in which the same parts as those in FIG. In FIG. 4, a comparison circuit 1 for determining whether or not the current of the inverter 4 has reached a preset current limit value.
In response to the comparator circuit 14, the inverter 4 responds to the overcurrent control circuit 15 and the comparator circuit 14 which instantaneously reduce the inverter current when the current of the inverter 4 is in the overcurrent state.
Determination circuit 21 which gives a command signal for turning on the semiconductor switch 11 to the signal generation circuit 16 when the current reaches the current limit value and is in an overcurrent state. A load state change signal obtained before turning on or additional turning on of the load 12 is applied.

【0023】前述のように構成された請求項3に記載の
発明によれば、インバ―タ4が過電流状態となれば、半
導体スイッチ11はタ―ンオンされるが、更に、負荷状
態変化信号が判定回路21に印加されればその後、負荷
12が投入或いは追加投入されることになるので、その
時は前持って半導体スイッチ11をタ―ンオンしておけ
ば過大な起動電流は商用電源1から供給することができ
る。
According to the third aspect of the present invention configured as described above, when the inverter 4 is in the overcurrent state, the semiconductor switch 11 is turned on. Is applied to the determination circuit 21, the load 12 is then turned on or additionally turned on. Therefore, at that time, if the semiconductor switch 11 is turned on in advance, an excessive starting current is generated from the commercial power source 1. Can be supplied.

【0024】次に、請求項4に記載の発明の一実施例を
図1と同一部に同一符号を付して示す図5を参照して説
明する。図5において、インバ―タ4aの電流が予め設
定した電流制限値に達したかどうかを判定する比較回路
14aと、電流過大時にインバ―タ電流を瞬時に絞る過
電流制御回路15aと、インバ―タ電流が電流制限値に
達した時に、半導体スイッチ11をオンする信号発生回
路16aと、各々の信号発生回路16a,16b…から
の出力を受け取り、各々のインバ―タ4a,4b…の
内、半数以上が半導体スイッチ11をオンする状態の時
に、半導体スイッチ11をタ―ンオンさせる多数決回路
20を設ける。
Next, an embodiment of the invention described in claim 4 will be described with reference to FIG. 5, in which the same parts as those in FIG. In FIG. 5, a comparator circuit 14a for determining whether or not the current of the inverter 4a has reached a preset current limit value, an overcurrent control circuit 15a for instantaneously reducing the inverter current when the current is excessive, and an inverter. When the output currents of the inverters 4a, 4b ... Are received by the signal generation circuit 16a which turns on the semiconductor switch 11 when the output current reaches the current limit value and the outputs of the respective signal generation circuits 16a, 16b. A majority circuit 20 is provided for turning on the semiconductor switches 11 when more than half are in the state of turning on the semiconductor switches 11.

【0025】図5のように構成された請求項4の発明
は、判定回路20は、各々のインバ―タ4a,4b…か
ら、各々の信号発生回路16a,16b…からの出力を
受け取り、半数以上が半導体スイッチ11をオンする状
態の時に、半導体スイッチ11をオンする。ただし、半
数以下の場合は、並列運転中の他の変換装置13で電流
を補償することで、半導体スイッチ11はオンしない。
複数台の変換装置13が並列で運転中で、その半数以上
が半導体スイッチ11をオンする状態のときに、図1の
回路と等価となり、同様の効果が期待できる。
According to the invention of claim 4 configured as shown in FIG. 5, the decision circuit 20 receives the outputs from the respective signal generating circuits 16a, 16b ... From the respective inverters 4a, 4b. The semiconductor switch 11 is turned on when the semiconductor switch 11 is turned on. However, when the number is less than half, the semiconductor switch 11 is not turned on by compensating the current with the other conversion device 13 in parallel operation.
When a plurality of converters 13 are operating in parallel and more than half of them are in the state of turning on the semiconductor switch 11, the circuit becomes equivalent to the circuit of FIG. 1 and the same effect can be expected.

【0026】[0026]

【発明の効果】以上説明したように、請求項1乃至請求
項4に記載の発明によれば、電源システムのインバ―タ
電流を検出し、インバ―タ電流が電流制限値に達する
と、瞬時に電流垂下制御を行うことと、半導体スイッチ
をオンして商用電源から電力供給を行うことにより、変
換装置からの電力供給を止めることなく、高性能な電力
変換を行うことができる。
As described above, according to the inventions of claims 1 to 4, when the inverter current of the power supply system is detected and the inverter current reaches the current limit value, the instant By performing the current drooping control and turning on the semiconductor switch to supply power from the commercial power supply, high-performance power conversion can be performed without stopping the power supply from the conversion device.

【図面の簡単な説明】[Brief description of drawings]

【図1】請求項1に記載の発明の無停電電源装置の一実
施例を示す構成図。
FIG. 1 is a configuration diagram showing an embodiment of an uninterruptible power supply device according to the invention described in claim 1.

【図2】請求項2に記載の発明の無停電電源装置の一実
施例を示す構成図。
FIG. 2 is a configuration diagram showing an embodiment of the uninterruptible power supply device of the invention according to claim 2;

【図3】請求項2に記載の発明の無停電電源装置の他の
実施例を示す構成図。
FIG. 3 is a configuration diagram showing another embodiment of the uninterruptible power supply device according to the present invention.

【図4】請求項3に記載の発明の無停電電源装置の一実
施例を示す構成図。
FIG. 4 is a configuration diagram showing an embodiment of the uninterruptible power supply device of the invention according to claim 3;

【図5】請求項4に記載の発明の無停電電源装置の一実
施例を示す構成図。
FIG. 5 is a configuration diagram showing an embodiment of the uninterruptible power supply device of the invention according to claim 4;

【図6】従来の無停電電源装置を示す構成図。FIG. 6 is a configuration diagram showing a conventional uninterruptible power supply.

【符号の説明】[Explanation of symbols]

1 …商用電源 2 …交
流リアクトル 3 …コンバータ 4 …イ
ンバータ 5 …平滑コンデンサ 6 …制
御回路 7 …電流検出器 8 …イ
ンハバ―タトランス 9 …フィルタコンデンサ 10 …接
触器 11 …半導体スイッチ 12 …負
荷 13 …変換装置 14 …比
較回路 15 …過電流制御回路 16 …信
号発生回路 17 …判定回路 18 …負
荷電流検出器 19 …判定回路 20 …多
数決回路 21 …判定回路
1 ... Commercial power supply 2 ... AC reactor 3 ... Converter 4 ... Inverter 5 ... Smoothing capacitor 6 ... Control circuit 7 ... Current detector 8 ... Inverter transformer 9 ... Filter capacitor 10 ... Contactor 11 ... Semiconductor switch 12 ... Load 13 ... Conversion Device 14 ... Comparison circuit 15 ... Overcurrent control circuit 16 ... Signal generation circuit 17 ... Judgment circuit 18 ... Load current detector 19 ... Judgment circuit 20 ... Majority decision circuit 21 ... Judgment circuit

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 商用電源から供給される交流を直
流に変換するコンバ―タと、該コンバ―タの直流を交流
に変換するインバ―タから成る変換装置の出力と、前記
商用電源のいずれかを切換回路で選択して負荷に給電す
るようにした無停電電源装置において、前記インバ―タ
の電流を検出する電流検出手段と、この電流検出手段の
出力が所定の値を超えて過電流となったことを検出する
比較手段と、該比較手段に応答し過電流時に前記インバ
―タの出力電流を絞る過電流制御手段と、前記比較手段
に応答し前記切換回路を前記変換装置側から前記商用電
源側へ切換える手段とを備えたことを特徴とする無停電
電源装置。
1. A converter for converting an alternating current supplied from a commercial power supply into a direct current, and an output of a conversion device including an inverter for converting a direct current of the converter into an alternating current, and any one of the commercial power supply. In the uninterruptible power supply device which is selected by the switching circuit to supply power to the load, current detecting means for detecting the current of the inverter, and the output of the current detecting means exceeds a predetermined value to cause an overcurrent. Comparing means for detecting that the output current of the inverter is reduced when an overcurrent is responsive to the comparing means, and the switching circuit is responsive to the comparing means from the conversion device side to the above An uninterruptible power supply characterized by comprising means for switching to a commercial power supply side.
【請求項2】 商用電源から供給される交流を直
流に変換するコンバ―タと、該コンバ―タの直流を交流
に変換するインバ―タから成る変換装置の出力と、前記
商用電源のいずれかを切換回路で選択して負荷に給電す
るようにした無停電電源装置において、前記インバ―タ
の電流を検出する電流検出手段と、この電流検出手段の
出力が所定の値を超えて過電流となったことを検出する
比較手段と、該比較手段に応答し過電流時に前記インバ
―タの出力電流を絞る過電流制御手段と、前記インバ―
タが力行か回生かを判断する判定手段と、該判定手段及
び前記比較手段に応答し過電流状態で且つ力行状態の条
件で前記切換回路を前記変換装置側から前記商用電源側
へ切換える手段とを備えたことを特徴とする無停電電源
装置。
2. A converter for converting an alternating current supplied from a commercial power source into a direct current and an inverter for converting a direct current of the converter into an alternating current, and one of the commercial power source. In the uninterruptible power supply device which is selected by the switching circuit to supply power to the load, current detecting means for detecting the current of the inverter, and the output of the current detecting means exceeds a predetermined value to cause an overcurrent. Comparing means for detecting that the output current of the inverter is reduced in response to the comparing means, and an overcurrent control means for reducing the output current of the inverter at the time of overcurrent;
Determining means for determining whether the power is running or regenerating, and means for responding to the determining means and the comparing means, switching the switching circuit from the converter side to the commercial power source side under an overcurrent condition and a power running condition. An uninterruptible power supply characterized by having.
【請求項3】 商用電源から供給される交流を直
流に変換するコンバ―タと、該コンバ―タの直流を交流
に変換するインバ―タから成る変換装置の出力と、前記
商用電源のいずれかを切換回路で選択して負荷に給電す
るようにした無停電電源装置において、前記インバ―タ
の電流を検出する電流検出手段と、この電流検出手段の
出力が所定の値を超えて過電流となったことを検出する
比較手段と、該比較手段に応答し過電流時に前記インバ
―タの出力電流を絞る過電流制御手段と、前記比較手段
及び前記負荷の投入或いは負荷の追加投入される前に得
られる負荷状態変化信号に応答し前記切換回路を前記変
換装置側から前記商用電源側へ切換える手段とを備えた
ことを特徴とする無停電電源装置。
3. A converter for converting an alternating current supplied from a commercial power source into a direct current, and an output of a converter comprising an inverter for converting the direct current of the converter into an alternating current, and any one of the commercial power sources. In the uninterruptible power supply device which is selected by the switching circuit to supply power to the load, current detecting means for detecting the current of the inverter, and the output of the current detecting means exceeds a predetermined value to cause an overcurrent. Comparison means for detecting that the output current of the inverter has been reduced in response to the comparison means, and an overcurrent control means for reducing the output current of the inverter, and before the comparison means and the load are turned on or additional loads are turned on. And a means for switching the switching circuit from the converter side to the commercial power source side in response to the load state change signal obtained in FIG.
【請求項4】 商用電源から供給される交流を直
流に変換するコンバ―タと、該コンバ―タの直流を交流
に変換するインバ―タから成る変換装置を複数台並列接
続し、該並列接続された複数台の変換装置の出力と、前
記商用電源のいずれかを切換回路で選択して負荷に給電
するようにした無停電電源装置に於て、前記各変換装置
はインバ―タの電流を検出する電流検出手段と、この電
流検出手段の出力が所定の値を超えて過電流となったこ
とを検出する比較手段と、該比較手段に応答し過電流時
に前記インバ―タの出力電流を絞る過電流制御手段を具
備し、前記それぞれの比較手段の出力が印加され、複数
台のインバ―タの内、半数以上のインバ―タが過電流状
態の時に前記切換回路を前記並列接続された複数台の変
換装置側から前記商用電源側へ切換える手段とを備えた
ことを特徴とする無停電電源装置。
4. A plurality of converters connected in parallel, each of which is composed of a converter for converting an alternating current supplied from a commercial power source into a direct current and an inverter for converting the direct current of the converter into an alternating current, and the parallel connection. In the uninterruptible power supply device in which the output of the plural converters and one of the commercial power supplies are selected by the switching circuit to supply power to the load, each converter converts the current of the inverter. A current detecting means for detecting, a comparing means for detecting that the output of the current detecting means exceeds a predetermined value and becomes an overcurrent, and an output current of the inverter at the time of overcurrent in response to the comparing means. The switching circuit is connected in parallel when the output of each of the comparison means is applied, and more than half of the plurality of inverters are in an overcurrent state. Commercial power supply from multiple converters An uninterruptible power supply comprising a means for switching to the side.
JP18674095A 1995-07-24 1995-07-24 Uninterruptible power system Expired - Lifetime JP3473924B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18674095A JP3473924B2 (en) 1995-07-24 1995-07-24 Uninterruptible power system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18674095A JP3473924B2 (en) 1995-07-24 1995-07-24 Uninterruptible power system

Publications (2)

Publication Number Publication Date
JPH0937564A true JPH0937564A (en) 1997-02-07
JP3473924B2 JP3473924B2 (en) 2003-12-08

Family

ID=16193831

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3473924B2 (en)

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* Cited by examiner, † Cited by third party
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JP2003088000A (en) * 2001-09-17 2003-03-20 Toshiba Corp Power source changer
JP2007189861A (en) * 2006-01-16 2007-07-26 Toshiba Mitsubishi-Electric Industrial System Corp Uninterruptible power supply system
JP2009124836A (en) * 2007-11-14 2009-06-04 Fuji Electric Systems Co Ltd Controller of uninterrupted power supply system
JP2014056336A (en) * 2012-09-11 2014-03-27 Nec Commun Syst Ltd Power supply device and malfunction treatment method
CN112670957A (en) * 2020-12-29 2021-04-16 联合汽车电子有限公司 Vehicle-mounted DC/DC overcurrent diagnosis method and device and computer readable storage medium

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JP2009124836A (en) * 2007-11-14 2009-06-04 Fuji Electric Systems Co Ltd Controller of uninterrupted power supply system
JP2014056336A (en) * 2012-09-11 2014-03-27 Nec Commun Syst Ltd Power supply device and malfunction treatment method
CN112670957A (en) * 2020-12-29 2021-04-16 联合汽车电子有限公司 Vehicle-mounted DC/DC overcurrent diagnosis method and device and computer readable storage medium
CN112670957B (en) * 2020-12-29 2024-03-19 联合汽车电子有限公司 Vehicle-mounted DC/DC overcurrent diagnosis method, device and computer readable storage medium

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