JP2004289964A

JP2004289964A - Automatic power supply multiplexing apparatus

Info

Publication number: JP2004289964A
Application number: JP2003080612A
Authority: JP
Inventors: Akio Kuruma; 章夫車
Original assignee: NEC Fielding Ltd
Current assignee: NEC Fielding Ltd
Priority date: 2003-03-24
Filing date: 2003-03-24
Publication date: 2004-10-14
Anticipated expiration: 2023-03-24
Also published as: JP4102691B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic power supply multiplexing apparatus which changes a plurality of power supplies and automatically connects them to a load, wherein the power supply connected to a load can be automatically recognized. <P>SOLUTION: To connect a live power line of two sets of power lines to be connected to a commercial power supply 21 and an engine generator 22 to an information processor 32, a coil of one relay RL1 and RL2 and contacts rI1 and rI2 of the two relays are respectively connected to the two sets of the power lines. With respect to the relay RL1, the make contact is connected to the power line from the commercial power supply 21, and the break contact is connected to the power line from the engine generator 22. With respect to the relay RL2, the make contact is connected to the power line from the engine generator 22, and the break contact is connected to the power line from the commercial power supply 21. A relay state detection circuit 9 is provided which detects states of the contacts rI1 and rI2 of at least either of the relays RL1 and RL2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、自動電源多重化装置に関し、特に、複数組の電源線を切り換えて情報処理装置などの負荷に電源を自動的に接続する自動電源多重化装置に関する。
【０００２】
【従来の技術】
コンピュータなどの情報処理システムにおいて、一般的に、主要な回路・機器などを二重化・多重化することにより、システムの信頼性や運用性を向上させる技術がある。
【０００３】
電源の多重化技術もシステムの信頼性や運用性を向上させる一手段として効果の著しいもので、電源供給がシステム稼働に必要不可欠であることから、システムの信頼性や運用性の向上に大いに寄与している。
【０００４】
電源の多重化技術として、複数の電源を自動的に切り換えて負荷に接続するものがある（例えば、特許文献１参照。）。
【０００５】
特許文献１記載の技術について、図４を参照して説明する。
【０００６】
図４を参照すると、自動電源多重化装置１４０は、リレーＲＬ１３が電源Ｅ１に接続され、電源Ｅ１が供給されているときには常にオン状態であり、リレーＲＬ１３の接点ｒｌ１３は、接点ｒ１３１、接点ｒ１３２、接点ｒ１３３、接点ｒ１３４の４つの接点を有し、リレーＲＬ１３のメーク接点ｒ１３１およびｒ１３２は、電源Ｅ１に対してリレーＲＬ１３の接続点Ｐ１１よりも負荷１５０側に装入され、リレーＲＬ１３のブレーク接点ｒ１３３およびｒ１３４は、電源Ｅ２側に装入され、また、リレーＲＬ１４は、電源Ｅ２に接続され、その接続点Ｐ１２は、リレーＲＬ１３のブレーク接点ｒ１３３およびｒ１３４よりも電源Ｅ２に対して負荷１５０側にあり、リレーＲＬ１４の接点ｒｌ１４は、接点ｒ１４１、接点ｒ１４２、接点ｒ１４３、接点ｒ１４４の４つの接点を有し、リレーＲＬ１４のメーク接点ｒ１４３およびｒ１４４は、リレーＲＬ１４の接続点Ｐ１２よりも負荷１５０側に装入され、リレーＲＬ１４のブレーク接点ｒ１４１およびｒ１４２は、電源Ｅ１側に装入され、リレーＲＬ１３の接続点Ｐ１１よりも負荷１５０側に位置するよう構成される。
【０００７】
また、上記配線を経た電源Ｅ１およびＥ２の電源線を接続点Ｐ１３において集線して負荷１５０に接続して構成される。
【０００８】
次に、上述のように構成された自動電源多重化装置１４０の動作について説明する。
【０００９】
自動電源多重化装置１４０は、電源Ｅ１およびＥ２が給電されているとき、常に電源Ｅ１を負荷１５０に接続するが、電源Ｅ１給電中は、リレーＲＬ１３がオンとなり、リレーＲＬ１３のブレーク接点ｒ１３３およびｒ１３４がブレークしてリレー１４をオフすると同時に、リレーＲＬ１３のメーク接点ｒ１３１およびｒ１３２がメークし、さらにリレーＲＬ１４がオフしているのでそのブレーク接点ｒ１４１およびｒ１４２を経て電源Ｅ１を負荷１５０に接続する。
【００１０】
また、電源Ｅ１の給電が中断し、電源Ｅ２が給電中のときは、リレーＲＬ１３がオフとなり、そのブレーク接点ｒ１３３およびｒ１３４を経てリレーＲＬ１４がオンとなり、リレーＲＬ１４のメーク接点ｒ１４３およびｒ１４４がメークして、電源Ｅ２を負荷１５０に接続する。
【００１１】
このとき、給電が中断していた電源Ｅ１が復旧して給電を再開すると、リレーＲＬ１３がオンとなり、そのメーク接点ｒ１３１およびｒ１３２をメークすると同時に、ブレーク接点ｒ１３３およびｒ１３４をブレークし、リレーＲＬ１４をオフにし、リレーＲＬ１４のブレーク接点がメーク状態となり、電源Ｅ１が負荷１５０に接続される。
【００１２】
さらに、電源Ｅ１およびＥ２が共に給電停止の状態から同時に給電再開したとき、各リレーＲＬ１３およびＲＬ１４は、それぞれのブレーク接点をブレークしてからメーク接点をメークするように作動するので、電源Ｅ１およびＥ２が短絡することはない。
【００１３】
しかし、上記自動電源多重化装置１４０は、負荷１５０に給電している電源がＥ１またはＥ２のどちらであるかの判別がつかず、供給電源がＥ１とＥ２では、負荷１５０の処理が異なる場合には、使用できないという欠点がある。
【００１４】
例えば、負荷１５０が無停電電源装置（図示せず）と情報処理装置（図示せず）で構成されており、電源Ｅ１に商用電源が与えられ、電源Ｅ２にエンジン発電機が与えられている場合、商用電源がダウンし、エンジン発電機からの電力で無停電電源装置（ＵＰＳ）が動作している場合、エンジン発電機の発電持続時間を考慮して、情報処理装置のコンピュータ機器にシャットダウン指示を与えることなどにより運用性向上は可能であるが、選択されている入力電源系を認識することができないため、コンピュータ機器のシャットダウン時間は、ＵＰＳのバッテリ保持時間での制限を受け、エンジン発電機による保持時間は、シャットダウン時間の増加に寄与させることができないという欠点がある。
【００１５】
【特許文献１】
特開昭６１ー２０７１３５号公報
【００１６】
【発明が解決しようとする課題】
上述のように、従来の自動電源多重化装置は、電源として、商用電源とエンジン発電機が付与され、商用電源がダウンし、エンジン発電機からの電力で無停電電源装置が動作している場合、コンピュータ機器（負荷）に給電している電源がの判別がつかないため、コンピュータ機器のシャットダウン時間は、無停電電源装置のバッテリ保持時間での制限を受け、エンジン発電機による保持時間は、シャットダウン時間の増加に寄与させることができないという課題がある。
【００１７】
本発明の目的は、複数の電源を切り換えて負荷に自動的に接続する自動電源多重化装置において、負荷に接続されている電源を認識できるようにした自動電源多重化装置を提供することにある。
【００１８】
【課題を解決するための手段】
本発明の自動電源多重化装置は、ｎ個の電源に接続されるｎ組（ｎ≧２）の電源線の中の活線状態の１組を負荷に接続するためにｎ組の電源線にそれぞれ１個のリレーのコイルとｎ個のリレーの接点を接続した自動電源多重化装置において、ｎ個のリレーの内の少なくとも１個のリレーの接点の状態を検出する状態信号検出手段を有することを特徴とする。
【００１９】
本発明の自動電源多重化装置は、ｎ個の電源に接続されるｎ組（ｎ≧２）の電源線の中の活線状態の１組を負荷に接続するためにｎ組の電源線にそれぞれ１個のリレーのコイルとｎ個のリレーの接点を接続した自動電源多重化装置において、第ｍ組（１≦ｍ≦ｎ）の電源線に接続したリレーは、第ｍ組の電源線にメーク接点を、第ｍ組を除くすべての電源線にブレーク接点を有し、第ｍ組の電源線に接続するリレーのコイルは、第１組〜第ｍー１組の電源線に各々接続したリレーのブレーク接点よりも負荷側に結線し、かつ、第ｍ組の電源線に接続するリレーのメーク接点および第ｍ＋１組〜第ｎ組の電源線に接続するリレーのブレーク接点よりも電源側に結線し、ｎ組の電源線の内の１組を負荷に接続し、ｎ個のリレーの内の少なくとも１個のリレーの接点の状態を検出する状態信号検出手段を有することを特徴とする。
【００２０】
本発明の自動電源多重化装置は、２個の電源に接続される２組の電源線の中の活線状態の１組を負荷に接続するために２組の電源線にそれぞれ１個のリレーのコイルと２個のリレーの接点を接続した自動電源多重化装置において、第１組の電源線に接続した第一リレーは、第１組の電源線にメーク接点を、第２組の電源線にブレーク接点を有し、第２組の電源線に接続した第二リレーは、第２組の電源線にメーク接点を、第１組の電源線にブレーク接点を有し、第二リレーの第二コイルは、第一リレーのブレーク接点よりも負荷側に結線し、かつ、第二リレーのメーク接点および第二リレーのブレーク接点よりも電源側に結線し、２組の電源線の内の何れか１組を負荷に接続し、第一リレーと第二リレーとの内の少なくとも一方の接点の状態を検出する状態信号検出手段を有することを特徴とする。
【００２１】
ｎ組の電源線の内の１組の負荷への接続は、第１組〜第ｍー１組の電源線の給電がすべて中断したとき、第ｍ組の電源線を負荷に接続し、かつ、第ｍ＋１組〜第ｎ組の電源線のすべてを負荷に接続しないことを特徴とする。
【００２２】
第一リレーおよび第二リレーは、共に、５つの接点を有することを特徴とする。
【００２３】
第一リレーおよび前記第二リレーは、共に、メーク接点を３個とブレーク接点を２個とを有することを特徴とする。
【００２４】
第一リレーおよび第二リレーは、共に、３つの接点を有することを特徴とする。
【００２５】
第一リレーおよび第二リレーは、共に、メーク接点を２個とブレーク接点を１個とを有することを特徴とする。
【００２６】
状態信号検出手段は、メーク接点の状態を検出することを特徴とする。
【００２７】
状態信号検出手段は、メーク接点が短絡時にローレベル信号を出力し、開放時にハイレベル信号を出力する手段を有することを特徴とする。
【００２８】
電源は、交流商用電源とエンジン発電機とを有することを特徴とする。
【００２９】
電源は、商用電源から生成される第一の直流電源と、バッテリバックアップされた第二の直流電源とを有することを特徴とする。
【００３０】
負荷は、情報処理装置を有し、情報処理装置は、無停電電源装置を介して電源と接続されることを特徴とする。
【００３１】
【発明の実施の形態】
次に、本発明の自動電源多重化装置の第一の実施の形態について、図面を参照して説明する。
【００３２】
図１は、本発明の自動電源多重化装置１０の第一の実施の形態を示す概略回路図、図３は、図１中のリレー状態検出回路９を示す図である。
【００３３】
図１を参照すると、自動電源多重化装置１０は、リレーＲＬ１（コイル）が電源Ｅ１としての商用電源２１に接続され、商用電源２１が供給されているときには常にオン状態であり、リレーＲＬ１の接点ｒｌ１は、接点ｒ１１、接点ｒ１２、接点ｒ１３、接点ｒ１４、接点ｒ１５の５つの接点を有し、リレーＲＬ１のメーク接点ｒ１１およびｒ１２は、電源Ｅ１に対してリレーＲＬ１の接続点Ｐ１よりもＵＰＳ（無停電交流電源装置）３１側に装入され、リレーＲＬ１のブレーク接点ｒ１３およびｒ１４は、電源Ｅ２としてのエンジン発電機２２に装入され、リレーＲＬ１のメーク接点ｒ１５は、リレーＲＬ１の状態検出信号Ｓ１として取り出され、リレー状態検出回路９に入力され、状態検出信号Ｓ１が短絡状態のときは、リレーＲＬ１のオン状態を、状態検出信号Ｓ１が開放状態のときは、リレーＲＬ１のオフ状態を示すよう構成される。
【００３４】
リレーＲＬ２（コイル）は、電源Ｅ２としてのエンジン発電機２２に接続され、その接続点Ｐ２は、リレーＲＬ１のブレーク接点ｒ１３およびｒ１４よりも電源Ｅ２に対してＵＰＳ３１側にあり、リレーＲＬ２の接点ｒｌ２は、接点ｒ２１、接点ｒ２２、接点ｒ２３、接点ｒ２４、接点ｒ２５の５つの接点を有し、リレーＲＬ２のメーク接点ｒ２３およびｒ２４は、リレーＲＬ２の接続点Ｐ２よりもＵＰＳ３１側に装入され、リレーＲＬ２のブレーク接点ｒ２１およびｒ２２は、商用電源２１側に装入され、リレーＲＬ１の接続点Ｐ１よりもＵＰＳ３１側に位置し、リレーＲＬ２のメーク接点ｒ２５は、リレーＲＬ２の状態検出信号Ｓ２として取り出され、リレー状態検出回路９に入力され、状態検出信号Ｓ２が短絡状態のときは、リレーＲＬ２のオン状態を、状態検出信号Ｓ２が開放状態のときは、リレーＲＬ２のオフ状態を示すよう構成される。
【００３５】
上記配線を経た商用電源２１およびエンジン発電機２２の電源線を接続点Ｐ３において集線して、ＵＰＳ３１を介して情報処理装置３２に接続して構成される。
【００３６】
ここで、リレー状態検出回路９について説明する。
【００３７】
図３を参照すると、リレー状態検出回路９は、抵抗Ｒ２とコンデンサＣ３とからなるフィルタ回路９１と、比較器９２と、ＮＡＮＤ回路９３と、抵抗Ｒ４、Ｒ５、Ｒ６、Ｒ７、Ｒ９、Ｒ１０とで構成されるが、一般的な回路のため、その詳細な回路の説明を省略する。
【００３８】
状態検出信号Ｓ１、または、Ｓ２が短絡状態のとき（リレーＲＬ１、または、リレーＲＬ２がオンのとき）は、ＮＡＮＤ回路９３からＬ信号（ローレベル信号）が出力され、開放状態のとき（リレーＲＬ１、または、リレーＲＬ２がオフのとき）は、ＮＡＮＤ回路９３からＨ信号（ハイレベル信号）が出力されるが、情報処理装置３２側で、受信した信号がＬ信号のとき、継続運転が可能であることを示す信号、受信した信号がＨ信号のとき、運転停止中であることを示す信号として処理する。
【００３９】
次に、上述のように構成された自動電源多重化装置１０の動作について説明する。
【００４０】
商用電源２１が給電されているときは、常に、商用電源２１をＵＰＳ３１に接続するが、商用電源２１給電中は、リレーＲＬ１がオンとなり、リレーＲＬ１のブレーク接点ｒ１３およびｒ１４がブレークしてリレー２をオフすると同時に、リレーＲＬ１のメーク接点ｒ１１およびｒ１２がメークし、さらにリレーＲＬ２がオフしているので、そのブレーク接点ｒ２１およびｒ２２を経て商用電源２１をＵＰＳ３１を介して情報処理装置３２に給電し、また、状態検出信号Ｓ１は、商用電源２１が給電状態であり、リレーＲＬ１がオン状態であることを示す短絡状態をリレー状態検出回路９に入力する。
【００４１】
その結果、リレー状態検出回路９からは、情報処理装置３２に対し、継続運転が可能であることを示すＬ信号を送出し、情報処理装置３２は継続運転を行う。
【００４２】
なお、図示しないが、リレー状態検出回路９からは、ＵＰＳ３１、または、情報処理装置３２とＵＰＳ３１との両方に対し、継続運転が可能であることを示すＬ信号を送出してもよい。
【００４３】
次に、商用電源２１の給電が中断したとき、エンジン発電機２２が給電中であれば、リレーＲＬ１がオフとなり、そのブレーク接点ｒ１３およびｒ１４を経てリレーＲＬ２がオンとなり、リレーＲＬ２のメーク接点ｒ２３およびｒ２４がメークして、エンジン発電機２２をＵＰＳ３１を介して情報処理装置３２に接続し、また、状態検出信号Ｓ２は、商用電源２１が給電停止状態、リレーＲＬ１がオフ状態、かつ、エンジン発電機２２が給電中であり、リレーＲＬ２がオン状態であることを示す短絡状態をリレー状態検出回路９に入力する。
【００４４】
商用電源２１とエンジン発電機２２との給電切り換わり時には、商用電源２１とエンジン発電機２２とがアークを含めて短絡しないことが電源設備として重要であり、これへの対応として、自動電源多重化装置１０は、数ｍ〜数十ｍ秒の切換時間が発生するが、ＵＰＳ３１によりバックアップされており、情報処理装置３２には何ら悪影響は生じない。
【００４５】
また、エンジン発電機２２の運用形態の一つとして、商用電源２１が給電中の場合には停止し、商用電源２１が給電停止状態であることを認識してから後、数十秒〜数分間経ってから正常電圧になる場合もあるが、ＵＰＳ３１によりバックアップされているため、情報処理装置３２には何ら悪影響は生じない。
【００４６】
上述のように、商用電源２１の給電が中断したとき、状態検出信号Ｓ２は、商用電源２１が給電停止状態、リレーＲＬ１がオフ状態、かつ、エンジン発電機２２が給電中でリレーＲＬ２がオン状態であることを示す短絡状態をリレー状態検出回路９に入力される。
【００４７】
その結果、リレー状態検出回路９は、情報処理装置３２の稼働状況とデータを磁気ディスク装置（図示せず）にセーブするのに必要なデータ退避時間、ＵＰＳ３１の停電保持時間、エンジン発電機２２のエンジン運転可能時間を考慮し、商用電源２１の給電停止状態が継続した場合に有効なシャットダウン信号（図示せず）を情報処理装置３２に対し送出し、情報処理装置３１を最も有効な時点でシャットダウン処理させることが可能となる。
【００４８】
また、上記状態の中でシャットダウン処理に移行する前に給電が中断していた商用電源２１が復旧して給電を再開すると、リレーＲＬ１がオンとなるのでそのメーク接点ｒ１１およびｒ１２をメークすると同時に、ブレーク接点ｒ１３およびｒ１４をブレークし、リレーＲＬ２をオフにし、リレーＲＬ２のブレーク接点ｒ２１およびｒ２２がメーク状態となるので、商用電源２１がＵＰＳ３１に接続される。
【００４９】
このとき、状態検出信号Ｓ１は、商用電源２１が給電状態で、リレーＲＬ１がオン状態であることを示す短絡状態をリレー状態検出回路９に入力する。
【００５０】
その結果、リレー状態検出回路９からは、情報処理装置３２に対し、継続運転が可能であることを示すＬ信号を送出し、情報処理装置３２は、継続運転を行う。
【００５１】
さらに、商用電源２１およびエンジン発電機２２が共に給電停止の状態から同時に給電再開したときには、各リレーＲＬ１およびＲＬ２はそれぞれのブレーク接点をブレークしてからメーク接点をメークするように作動するので、商用電源２１およびエンジン発電機２２が短絡することはない。
【００５２】
次に、本発明の自動電源多重化装置の第二の実施の形態について、図面を参照して説明する。
【００５３】
図２は、本発明の自動電源多重化装置６０の第二の実施の形態を示す概略回路図である。
【００５４】
自動電源多重化装置６０は、電源Ｅ１、Ｅ２のいずれか一方を切り換えてＵＰＳ（無停電直流電源装置）８１に自動的に接続するが、既述の図１に示す第一の実施の形態の自動電源多重化装置１０と異なる点は、電源Ｅ１と電源Ｅ２の電源が共に、直流電源である点、および、リレーＲＬ５の接点ｒｌ５およびリレーＲＬ６の接点ｒｌ６が、共に、３つの接点を有する点である。
【００５５】
図２を参照すると、リレーＲＬ５は、電源Ｅ１としての商用電源から生成される第一の直流電源７１に接続され、第一の直流電源７１が供給されているときには、常にオンしており、リレーＲＬ５の接点ｒｌ５は、接点ｒ５１、接点ｒ５２、接点ｒ５３の３つの接点を有し、リレーＲＬ５のメーク接点ｒ５１は、電源Ｅ１に対してリレーＲＬ５の接続点Ｐ１よりもＵＰＳ８１側に装入され、リレーＲＬ５のブレーク接点ｒ５２は、電源Ｅ２としてのバッテリバックアップされた第二の直流電源７２に装入され、リレーＲＬ５のメーク接点ｒ５３は、リレーＲＬ５の状態検出信号Ｓ５として取り出され、リレー状態検出回路１９に入力され、状態検出信号Ｓ５が短絡状態のときは、リレーＲＬ５のオン状態を、状態検出信号Ｓ５が開放状態のときは、リレーＲＬ５のオフ状態を示すよう構成される。
【００５６】
リレーＲＬ６は、電源Ｅ２としてのバッテリバックアップされた第二の直流電源７２に接続され、その接続点Ｐ２は、リレーＲＬ５のブレーク接点ｒ５２よりも電源Ｅ２に対してＵＰＳ８１側に位置し、リレーＲＬ６の接点ｒｌ６は、接点ｒ６１、接点ｒ６２、接点ｒ６３の３つの接点を有し、リレーＲＬ６のメーク接点ｒ６２は、リレーＲＬ６の接続点Ｐ２よりもＵＰＳ８１側に装入され、また、リレーＲＬ６のブレーク接点ｒ６１は、電源Ｅ１に装入され、リレーＲＬ５の接続点Ｐ１よりもＵＰＳ８１側に位置し、リレーＲＬ６のメーク接点ｒ６３は、リレーＲＬ６の状態検出信号Ｓ６として取り出され、リレー状態検出回路１９に入力され、状態検出信号Ｓ６が短絡状態のときは、リレーＲＬ６のオン状態を、状態検出信号Ｓ６が開放状態のときは、リレーＲＬ６のオフ状態を示すよう構成される。
【００５７】
上記配線を経た電源Ｅ１としての第一の直流電源７１および電源Ｅ２としての第二の直流電源７２は、接続点Ｐ３において集線してＵＰＳ８１を介して情報処理装置８２に接続されて構成される。
【００５８】
次に、上述のように構成された自動電源多重化装置６０の動作について説明する。
【００５９】
自動電源多重化装置６０は、第一の直流電源７１が給電しているときは常に第一の直流電源７１がＵＰＳ８１に接続されるが、第一の直流電源７１の給電中は、リレーＲＬ５がオンとなり、リレーＲＬ５のブレーク接点ｒ５２がブレークしてリレー６をオフすると同時に、リレーＲＬ５のメーク接点ｒ５１がメークし、リレーＲＬ６がオフしているので、リレーＲＬ６のブレーク接点ｒ６１を経て第一の直流電源７１が、ＵＰＳ８１を介して情報処理装置８２に給電される。
【００６０】
また、状態検出信号Ｓ５は、第一の直流電源７１が給電状態で、リレーＲＬ５がオン状態であることを示す短絡状態をリレー状態検出回路１９に入力され、その結果、リレー状態検出回路１９からは、情報処理装置８２に対し、継続運転が可能であることを示すＬ信号を送出し、情報処理装置８２は、継続運転を行う。
【００６１】
次に、商用電源から生成される第一の直流電源７１の給電が中断したとき、バッテリバックアップされた第二の直流電源７２が給電中であれば、リレーＲＬ５がオフとなるので、そのブレーク接点ｒ５２を経てリレーＲＬ６がオンとなる。
【００６２】
従って、リレーＲＬ６のメーク接点ｒ６２がメークして、第二の直流電源７２がＵＰＳ８１を介して情報処理装置８２に接続される。
【００６３】
また、状態検出信号Ｓ６は、第一の直流電源７１が給電停止状態、リレーＲＬ５がオフ状態、かつ、バッテリバックアップされた第二の直流電源７２が給電中であり、リレーＲＬ６がオン状態であることを示す短絡状態をリレー状態検出回路１９に入力される。
【００６４】
第一の直流電源７１と第二の直流電源７２との給電切り換わり時には、第一の直流電源７１と第二の直流電源７２とは、アークを含めて短絡しないことが電源設備として重要であるが、これへの対応として、自動電源多重化装置６０は、数ｍ〜数十ｍ秒の切換時間が発生するが、ＵＰＳ８１によりバックアップされており、情報処理装置８２には何ら悪影響は生じない。
【００６５】
上述のように、状態検出信号Ｓ６は、商用電源から生成される第一の直流電源７１の給電が中断し、第一の直流電源７１が給電停止状態、リレーＲＬ５がオフ状態、かつ、バッテリバックアップされた第二の直流電源７２が給電中であり、リレーＲＬ６がオン状態であることを示す短絡状態を、リレー状態検出回路１９に入力されるが、その結果、リレー状態検出回路１９は、情報処理装置８２の稼働状況とデータとを磁気ディスク装置（図示せず）にセーブするのに必要なデータ退避時間、ＵＰＳ８１の停電保持時間、第二の直流電源７２のバッテリバックアップ運転可能時間とを考慮し、第一の直流電源７１の給電停止状態が継続した場合に有効なシャットダウン信号（図示せず）を情報処理装置８２に対して送出することにより、情報処理装置８２を最も有効な時点でシャットダウン処理させることが可能となる。
【００６６】
また、上記状態の中で、シャットダウン処理に移行する前に、給電が中断していた第一の直流電源７１が復旧して給電を再開すると、リレーＲＬ５がオンとなるので、そのメーク接点ｒ５１をメークすると同時にブレーク接点ｒ５２をブレークしてリレーＲＬ６をオフにし、リレーＲＬ６のブレーク接点がメーク状態となり、第一の直流電源７１が、ＵＰＳ８１に接続される。
【００６７】
このとき、状態検出信号Ｓ５は、第一の直流電源７１が給電状態で、リレーＲＬ５がオン状態であることを示す短絡状態をリレー状態検出回路１９に入力されるが、その結果、リレー状態検出回路１９からは、情報処理装置８２に対して、継続運転が可能であることを示すＬ信号を送出し、情報処理装置８２は、継続運転を行う。
【００６８】
さらに、第一の直流電源７１および第二の直流電源７２とが、共に、給電停止の状態から同時に給電再開したときには、リレーＲＬ５およびＲＬ６は、それぞれのブレーク接点をブレークしてから後にメーク接点をメークするように作動するので、第一の直流電源７１および第二の直流電源７２が短絡することはない。
【００６９】
以上説明したように、自動電源多重化装置１０、６０は、複数組の電源を互いに短絡させることなく、自動的に切り換えて一つの電源を負荷に確実に接続できるとともに、負荷に接続される電源系統を認識できるという効果がある。
【００７０】
なお、上述の第一の実施の形態、第二の実施の形態では、電源が２個の場合について説明したが、３組以上の多重化電源とした場合、説明を省略するが、電源が２個の場合と同様の効果が得られ、また、さらなる電源の信頼性向上が得られるが、この場合も本発明に含まれることは、云うまでもない。
【００７１】
【発明の効果】
以上説明したように、本発明の自動電源多重化装置は、複数組の電源を互いに短絡させることなく、自動的に切り換えて一つの電源を負荷に接続できるとともに、負荷に接続される電源系統を認識できるという効果がある。
【図面の簡単な説明】
【図１】本発明の自動電源多重化装置の第一の実施の形態を示す概略回路図である。
【図２】本発明の自動電源多重化装置の第二の実施の形態を示す概略回路図である。
【図３】リレー状態検出回路を示す図である。
【図４】従来の自動電源多重化装置を示す回路図である。
【符号の説明】
９、１９リレー状態検出回路
９１フィルタ回路
９２比較器
９３ＮＡＮＤ回路
１０、６０、１４０自動電源多重化装置
Ｅ１、Ｅ２電源
２１商用電源
２２エンジン発電機
３１ＵＰＳ（無停電交流電源装置）
３２、８２情報処理装置
１５０負荷
７１第一の直流電源
７２第二の直流電源
８１ＵＰＳ（無停電直流電源装置）
ＲＬ１、ＲＬ２リレー
ＲＬ５、ＲＬ６リレー
ＲＬ１３、ＲＬ１４リレー
ｒｌ１ＲＬ１の接点
ｒｌ２ＲＬ２の接点
ｒｌ５ＲＬ５の接点
ｒｌ６ＲＬ６の接点
ｒｌ１３ＲＬ１３の接点
ｒｌ１４ＲＬ１４の接点
ｒ１１、ｒ１２、ｒ１５接点
ｒ２３、ｒ２４、ｒ２５接点
ｒ５１、ｒ５３接点
ｒ６２、ｒ６３接点
ｒ１３１、ｒ１３２接点
ｒ１４３、ｒ１４４接点
ｒ１３、ｒ１４接点
ｒ２１、ｒ２２接点
ｒ５２、ｒ６１接点
ｒ１３３、ｒ１３４接点
ｒ１４１、ｒ１４２接点
Ｐ１、Ｐ２、Ｐ３接続点
Ｐ１１、Ｐ１２、Ｐ１３接続点
Ｓ１、Ｓ２状態検出信号
Ｓ５、Ｓ６状態検出信号[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic power supply multiplexing apparatus, and more particularly, to an automatic power supply multiplexing apparatus that switches a plurality of power supply lines to automatically connect a power supply to a load such as an information processing apparatus.
[0002]
[Prior art]
2. Description of the Related Art In an information processing system such as a computer, there is generally a technique for improving reliability and operability of a system by duplicating and multiplexing main circuits and devices.
[0003]
Power supply multiplexing technology is also a remarkable effect as a means of improving system reliability and operability. Since power supply is indispensable for system operation, it greatly contributes to improving system reliability and operability. are doing.
[0004]
As a power supply multiplexing technique, there is a technique in which a plurality of power supplies are automatically switched and connected to a load (for example, see Patent Document 1).
[0005]
The technique described in Patent Document 1 will be described with reference to FIG.
[0006]
Referring to FIG. 4, the automatic power supply multiplexing apparatus 140 is always on when the relay RL13 is connected to the power supply E1 and the power supply E1 is supplied, and the contact rl13 of the relay RL13 has the contact r131, the contact r132, It has four contacts, a contact r133 and a contact r134, and the make contacts r131 and r132 of the relay RL13 are mounted on the load 150 side of the power supply E1 beyond the connection point P11 of the relay RL13, and the break contact r133 of the relay RL13 is provided. And r134 are mounted on the power supply E2 side, and the relay RL14 is connected to the power supply E2, and the connection point P12 is on the load 150 side of the power supply E2 with respect to the break contacts r133 and r134 of the relay RL13. , Contact rl14 of relay RL14 includes contact r141, contact r142, contact r1 3, four contacts of contact r144, make contacts r143 and r144 of relay RL14 are mounted on load 150 side from connection point P12 of relay RL14, and break contacts r141 and r142 of relay RL14 are connected to power supply E1. And is configured to be located closer to the load 150 than the connection point P11 of the relay RL13.
[0007]
Further, the power supply lines of the power supplies E1 and E2 passing through the above wirings are condensed at the connection point P13 and connected to the load 150.
[0008]
Next, the operation of the automatic power supply multiplexing apparatus 140 configured as described above will be described.
[0009]
The automatic power supply multiplexing apparatus 140 always connects the power supply E1 to the load 150 when the power supplies E1 and E2 are supplied with power. However, while the power supply E1 is supplied, the relay RL13 is turned on, and the break contacts r133 and r134 of the relay RL13 are turned on. At the same time as the relay 14 is turned off, the make contacts r131 and r132 of the relay RL13 are made. Since the relay RL14 is turned off, the power supply E1 is connected to the load 150 via the break contacts r141 and r142.
[0010]
When the power supply of the power supply E1 is interrupted and the power supply E2 is supplying power, the relay RL13 is turned off, the relay RL14 is turned on via the break contacts r133 and r134, and the make contacts r143 and r144 of the relay RL14 are made. Then, the power supply E2 is connected to the load 150.
[0011]
At this time, when the power supply E1 whose power supply has been interrupted is restored and the power supply is restarted, the relay RL13 is turned on, the make contacts r131 and r132 are made, and at the same time, the break contacts r133 and r134 are broken and the relay RL14 is turned off. Then, the break contact of relay RL14 is in the make state, and power supply E1 is connected to load 150.
[0012]
Further, when the power supplies E1 and E2 both resume power supply simultaneously from the power supply stop state, each of the relays RL13 and RL14 operates to break the respective break contact and then make the make contact, so that the power supplies E1 and E2 Never short-circuit.
[0013]
However, the automatic power supply multiplexing apparatus 140 cannot determine whether the power supplied to the load 150 is E1 or E2, and if the processing of the load 150 is different between E1 and E2. Has the disadvantage that it cannot be used.
[0014]
For example, when the load 150 includes an uninterruptible power supply device (not shown) and an information processing device (not shown), a commercial power supply is supplied to the power supply E1, and an engine generator is supplied to the power supply E2. When the commercial power supply is down and the uninterruptible power supply (UPS) is operating with the power from the engine generator, a shutdown instruction is issued to the computer device of the information processing device in consideration of the power generation duration of the engine generator. Although it is possible to improve the operability by giving the input power supply, the shutdown time of the computer device is limited by the battery holding time of the UPS because the selected input power supply system cannot be recognized. There is a disadvantage that the holding time cannot contribute to an increase in the shutdown time.
[0015]
[Patent Document 1]
JP-A-61-207135
[0016]
[Problems to be solved by the invention]
As described above, in the conventional automatic power supply multiplexing apparatus, when the commercial power supply and the engine generator are provided as the power supply, the commercial power supply is down, and the uninterruptible power supply operates with the power from the engine generator. Since the power supply to the computer equipment (load) cannot be determined, the shutdown time of the computer equipment is limited by the battery holding time of the uninterruptible power supply, and the holding time by the engine generator is shut down. There is a problem that it cannot contribute to an increase in time.
[0017]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic power supply multiplexing apparatus that switches between a plurality of power supplies and automatically connects to a load, and that can recognize the power supply connected to the load. .
[0018]
[Means for Solving the Problems]
The automatic power supply multiplexing apparatus of the present invention is configured such that n sets of power supply lines connected to n power supplies are connected to the n sets of power supply lines in order to connect one set in a live state to a load. In an automatic power supply multiplexing apparatus in which a coil of one relay is connected to a contact of n relays, a state signal detecting means for detecting a state of a contact of at least one of the n relays is provided. It is characterized by.
[0019]
The automatic power supply multiplexing apparatus of the present invention is configured such that n sets of power supply lines connected to n power supplies are connected to the n sets of power supply lines in order to connect one set in a live state to a load. In an automatic power supply multiplexing apparatus in which the coil of one relay and the contacts of n relays are connected, the relays connected to the m-th set (1 ≦ m ≦ n) of power supply lines are connected to the m-th set of power supply lines. The make contact has break contacts on all power lines except the m-th set, and the relay coils connected to the m-th set of power lines are connected to the first to m-th set of power lines, respectively. The relay is connected to the load side more than the break contact, and the make contact of the relay connected to the m-th set of power lines and the break contact of the relay connected to the (m + 1) -th to n-th set of power lines are closer to the power supply side. And one of the n sets of power lines is connected to the load, and at least one of the n relays is connected to the load. It characterized by having a state signal detecting means for detecting the state of contact of the relay.
[0020]
The automatic power supply multiplexing device of the present invention includes one relay for each of the two power supply lines for connecting one set of the live state of the two power supply lines connected to the two power supplies to the load. In the automatic power multiplexing apparatus in which the coil and the contacts of the two relays are connected, the first relay connected to the first set of power lines has a make contact on the first set of power lines, and the second set of power lines. The second relay connected to the second set of power supply lines has a make contact on the second set of power supply lines, has a break contact on the first set of power supply lines, and has a break contact on the first set of power supply lines. The two coils are connected to the load side more than the break contact of the first relay, and are connected to the power supply side than the make contact of the second relay and the break contact of the second relay. Or one set is connected to the load, and the state of at least one contact point of the first relay and the second relay It characterized by having a state signal detecting means detect.
[0021]
The connection of one of the n sets of power supply lines to the load includes connecting the m-th set of power supply lines to the load when power supply to all of the first to m-th set of power supply lines is interrupted, and , M + l to n-th power supply lines are not connected to the load.
[0022]
Both the first relay and the second relay have five contacts.
[0023]
Each of the first relay and the second relay has three make contacts and two break contacts.
[0024]
Each of the first relay and the second relay has three contacts.
[0025]
Both the first relay and the second relay have two make contacts and one break contact.
[0026]
The state signal detecting means detects a state of the make contact.
[0027]
The state signal detecting means includes a means for outputting a low-level signal when the make contact is short-circuited and outputting a high-level signal when the make contact is open.
[0028]
The power supply has an AC commercial power supply and an engine generator.
[0029]
The power supply has a first DC power supply generated from a commercial power supply and a second DC power supply backed up by a battery.
[0030]
The load has an information processing device, and the information processing device is connected to a power supply via an uninterruptible power supply.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a first embodiment of the automatic power supply multiplexing device of the present invention will be described with reference to the drawings.
[0032]
FIG. 1 is a schematic circuit diagram showing a first embodiment of an automatic power supply multiplexing device 10 of the present invention, and FIG. 3 is a diagram showing a relay state detecting circuit 9 in FIG.
[0033]
Referring to FIG. 1, the automatic power supply multiplexing apparatus 10 has a relay RL1 (coil) connected to a commercial power supply 21 serving as a power supply E1, and is always on when the commercial power supply 21 is supplied. rl1 has five contacts of a contact r11, a contact r12, a contact r13, a contact r14, and a contact r15, and the make contacts r11 and r12 of the relay RL1 are connected to the power supply E1 at a point higher than the connection point P1 of the relay RL1 by the UPS ( The break contacts r13 and r14 of the relay RL1 are mounted on the engine generator 22 as the power source E2, and the make contact r15 of the relay RL1 is connected to the state detection signal of the relay RL1. S1 is taken out and input to the relay state detection circuit 9, and when the state detection signal S1 is in a short-circuit state, the relay RL1 The down state, when the state detection signal S1 is in an open state, adapted to indicate the off-state of the relay RL1.
[0034]
The relay RL2 (coil) is connected to the engine generator 22 as the power supply E2, and its connection point P2 is closer to the UPS 31 than the break contacts r13 and r14 of the relay RL1 with respect to the power supply E2, and is connected to the contact rl2 of the relay RL2. Has five contacts, a contact r21, a contact r22, a contact r23, a contact r24, and a contact r25. The make contacts r23 and r24 of the relay RL2 are mounted on the UPS31 side with respect to the connection point P2 of the relay RL2. The break contacts r21 and r22 of the RL2 are inserted into the commercial power supply 21 and are located closer to the UPS 31 than the connection point P1 of the relay RL1, and the make contact r25 of the relay RL2 is taken out as the state detection signal S2 of the relay RL2. Is input to the relay state detection circuit 9, and when the state detection signal S2 is in a short-circuit state, the relay R The two on-state, when the state detection signal S2 is in an open state, adapted to indicate the off-state of the relay RL2.
[0035]
The power supply lines of the commercial power supply 21 and the engine generator 22 that have passed through the above wirings are converged at a connection point P3, and connected to the information processing device 32 via the UPS 31.
[0036]
Here, the relay state detection circuit 9 will be described.
[0037]
Referring to FIG. 3, the relay state detection circuit 9 includes a filter circuit 91 including a resistor R2 and a capacitor C3, a comparator 92, a NAND circuit 93, and resistors R4, R5, R6, R7, R9, and R10. Although it is configured, since it is a general circuit, detailed description of the circuit is omitted.
[0038]
When the state detection signal S1 or S2 is in a short-circuit state (when the relay RL1 or the relay RL2 is on), the L signal (low-level signal) is output from the NAND circuit 93, and when the state detection signal S1 or S2 is in the open state (relay RL1). Or when the relay RL2 is off), an H signal (high-level signal) is output from the NAND circuit 93. On the information processing device 32 side, when the received signal is an L signal, continuous operation is possible. When the signal indicating the presence and the received signal are H signals, the signal is processed as a signal indicating that the operation is stopped.
[0039]
Next, the operation of the automatic power supply multiplexing apparatus 10 configured as described above will be described.
[0040]
When the commercial power supply 21 is supplied with power, the commercial power supply 21 is always connected to the UPS 31. During the supply of the commercial power supply 21, the relay RL1 is turned on, and the break contacts r13 and r14 of the relay RL1 break and the relay 2 At the same time, the make contacts r11 and r12 of the relay RL1 are made and the relay RL2 is turned off, so that the commercial power supply 21 is supplied to the information processing device 32 via the UPS 31 via the break contacts r21 and r22. As the state detection signal S1, a short-circuit state indicating that the commercial power supply 21 is in the power supply state and the relay RL1 is in the on state is input to the relay state detection circuit 9.
[0041]
As a result, the relay state detection circuit 9 sends an L signal indicating that continuous operation is possible to the information processing device 32, and the information processing device 32 performs continuous operation.
[0042]
Although not shown, the L signal indicating that continuous operation is possible may be sent from the relay state detection circuit 9 to the UPS 31 or both the information processing device 32 and the UPS 31.
[0043]
Next, when the power supply from the commercial power supply 21 is interrupted, if the engine generator 22 is supplying power, the relay RL1 is turned off, the relay RL2 is turned on via the break contacts r13 and r14, and the make contact r23 of the relay RL2 is turned on. And r24 make and connect the engine generator 22 to the information processing device 32 via the UPS 31. The state detection signal S2 indicates that the commercial power supply 21 is in the power supply stop state, the relay RL1 is in the off state, and the engine power generation A short-circuit state indicating that the power is being supplied to the relay 22 and the relay RL2 is on is input to the relay state detection circuit 9.
[0044]
When the power supply is switched between the commercial power supply 21 and the engine generator 22, it is important for the power supply equipment not to short-circuit the commercial power supply 21 and the engine generator 22 including the arc. Although the switching time of several m to several tens of milliseconds occurs in the device 10, it is backed up by the UPS 31, and there is no adverse effect on the information processing device 32.
[0045]
In addition, as one of the operation modes of the engine generator 22, when the commercial power supply 21 is supplying power, the operation is stopped, and after the commercial power supply 21 recognizes that the supply of power is stopped, it takes several tens seconds to several minutes. There may be a case where the voltage becomes normal after passing through, but since it is backed up by the UPS 31, there is no adverse effect on the information processing device 32.
[0046]
As described above, when the power supply to the commercial power supply 21 is interrupted, the state detection signal S2 indicates that the power supply to the commercial power supply 21 is stopped, the relay RL1 is turned off, and the power is supplied to the engine generator 22 and the relay RL2 is turned on. Is input to the relay state detection circuit 9.
[0047]
As a result, the relay state detection circuit 9 determines the operation status of the information processing device 32 and the data evacuation time required to save the data in the magnetic disk device (not shown), the power failure holding time of the UPS 31, and the engine generator 22. In consideration of the operable time of the engine, a valid shutdown signal (not shown) is sent to the information processing device 32 when the power supply stop state of the commercial power supply 21 continues, and the information processing device 31 is shut down at the most effective time. It can be processed.
[0048]
Further, in the above state, when the commercial power supply 21 whose power supply has been interrupted before the transition to the shutdown processing is restored and the power supply is restarted, the relay RL1 is turned on, so that the make contacts r11 and r12 are made, and The break contacts r13 and r14 are broken, the relay RL2 is turned off, and the break contacts r21 and r22 of the relay RL2 are in a make state, so that the commercial power supply 21 is connected to the UPS 31.
[0049]
At this time, as the state detection signal S1, a short-circuit state indicating that the commercial power supply 21 is in the power supply state and the relay RL1 is in the on state is input to the relay state detection circuit 9.
[0050]
As a result, the L signal indicating that the continuous operation is possible is transmitted from the relay state detection circuit 9 to the information processing device 32, and the information processing device 32 performs the continuous operation.
[0051]
Furthermore, when the commercial power supply 21 and the engine generator 22 both resume power supply simultaneously from the power supply stop state, each of the relays RL1 and RL2 operates to break its break contact and then make the make contact. The power supply 21 and the engine generator 22 are not short-circuited.
[0052]
Next, a second embodiment of the automatic power supply multiplexing device of the present invention will be described with reference to the drawings.
[0053]
FIG. 2 is a schematic circuit diagram showing a second embodiment of the automatic power supply multiplexing device 60 of the present invention.
[0054]
The automatic power supply multiplexing apparatus 60 switches one of the power supplies E1 and E2 and automatically connects to the UPS (uninterruptible direct current power supply) 81, but the automatic power supply multiplexing apparatus 60 according to the first embodiment shown in FIG. The difference from the automatic power supply multiplexing apparatus 10 is that the power supplies E1 and E2 are both DC power supplies, and the contact rl5 of the relay RL5 and the contact rl6 of the relay RL6 both have three contacts. It is.
[0055]
Referring to FIG. 2, the relay RL5 is connected to a first DC power supply 71 generated from a commercial power supply as the power supply E1, and is always on when the first DC power supply 71 is supplied. The contact rl5 of the RL5 has three contacts of a contact r51, a contact r52, and a contact r53, and the make contact r51 of the relay RL5 is mounted on the UPS81 side with respect to the power supply E1 from the connection point P1 of the relay RL5, The break contact r52 of the relay RL5 is inserted into the battery-backed second DC power supply 72 as the power supply E2, and the make contact r53 of the relay RL5 is taken out as the state detection signal S5 of the relay RL5, and the relay state detection circuit 19, when the state detection signal S5 is short-circuited, the relay RL5 is turned on and the state detection signal S5 is opened. It is adapted to indicate the off-state of the relay RL5.
[0056]
The relay RL6 is connected to the battery-backed second DC power supply 72 as the power supply E2, and the connection point P2 is located closer to the UPS 81 than the break contact r52 of the relay RL5 with respect to the power supply E2. The contact rl6 has three contacts, a contact r61, a contact r62, and a contact r63. The make contact r62 of the relay RL6 is mounted on the UPS81 side with respect to the connection point P2 of the relay RL6. r61 is inserted in the power supply E1 and is located closer to the UPS 81 than the connection point P1 of the relay RL5. When the state detection signal S6 is short-circuited, the relay RL6 is turned on and the state detection signal S6 is opened. When state is adapted to indicate the off-state of the relay RL6.
[0057]
The first DC power supply 71 serving as the power supply E1 and the second DC power supply 72 serving as the power supply E2 via the above wiring are connected at the connection point P3 to the information processing device 82 via the UPS 81.
[0058]
Next, the operation of the automatic power supply multiplexing apparatus 60 configured as described above will be described.
[0059]
The automatic power supply multiplexing device 60 always connects the first DC power supply 71 to the UPS 81 when the first DC power supply 71 is supplying power, but the relay RL5 is turned on while the first DC power supply 71 is supplying power. At the same time, the break contact r52 of the relay RL5 breaks and the relay 6 is turned off. At the same time, the make contact r51 of the relay RL5 is made and the relay RL6 is turned off. The DC power supply 71 is supplied to the information processing device 82 via the UPS 81.
[0060]
The state detection signal S5 is input to the relay state detection circuit 19 as a short-circuit state indicating that the first DC power supply 71 is in the power supply state and the relay RL5 is in the on state. Sends an L signal indicating that continuous operation is possible to the information processing device 82, and the information processing device 82 performs continuous operation.
[0061]
Next, when the power supply of the first DC power supply 71 generated from the commercial power supply is interrupted and the second DC power supply 72 backed up by the battery is supplying power, the relay RL5 is turned off. The relay RL6 is turned on via r52.
[0062]
Accordingly, the make contact r62 of the relay RL6 is made, and the second DC power supply 72 is connected to the information processing device 82 via the UPS 81.
[0063]
The state detection signal S6 indicates that the first DC power supply 71 is in the power supply stopped state, the relay RL5 is in the off state, the battery-backed second DC power supply 72 is supplying power, and the relay RL6 is in the on state. Is input to the relay state detection circuit 19.
[0064]
When the power supply is switched between the first DC power supply 71 and the second DC power supply 72, it is important for the power supply equipment that the first DC power supply 71 and the second DC power supply 72 do not short-circuit including an arc. However, as a response to this, the automatic power multiplexing device 60 has a switching time of several m to several tens of milliseconds, but is backed up by the UPS 81 and does not adversely affect the information processing device 82 at all.
[0065]
As described above, the state detection signal S6 indicates that the power supply of the first DC power supply 71 generated from the commercial power supply is interrupted, the first DC power supply 71 is in the power supply stop state, the relay RL5 is in the off state, and the battery backup A short-circuit state indicating that the supplied second DC power supply 72 is supplying power and the relay RL6 is on is input to the relay state detection circuit 19, and as a result, the relay state detection circuit 19 Considering the data evacuation time, the power failure holding time of the UPS 81, and the battery backup operable time of the second DC power supply 72 required to save the operation status and data of the processing device 82 in the magnetic disk device (not shown). By transmitting a valid shutdown signal (not shown) to the information processing device 82 when the power supply stop state of the first DC power supply 71 continues, It is possible to shut down processing management apparatus 82 in the most effective time.
[0066]
Further, in the above state, when the first DC power supply 71 whose power supply has been interrupted is restored and the power supply is restarted before shifting to the shutdown processing, the relay RL5 is turned on. Simultaneously with the make, the break contact r52 is broken to turn off the relay RL6, the break contact of the relay RL6 is in a make state, and the first DC power supply 71 is connected to the UPS 81.
[0067]
At this time, the state detection signal S5 is input to the relay state detection circuit 19 as a short-circuit state indicating that the first DC power supply 71 is in the power supply state and the relay RL5 is in the on state. The circuit 19 sends an L signal indicating that the continuous operation is possible to the information processing device 82, and the information processing device 82 performs the continuous operation.
[0068]
Further, when the first DC power supply 71 and the second DC power supply 72 both resume power supply simultaneously from the power supply stop state, the relays RL5 and RL6 break their respective break contacts and then make contacts later. Since the first DC power supply 71 and the second DC power supply 72 are short-circuited, they are not short-circuited.
[0069]
As described above, the automatic power supply multiplexing devices 10 and 60 can automatically switch and reliably connect one power supply to a load without short-circuiting a plurality of power supplies. There is an effect that the strain can be recognized.
[0070]
In the first and second embodiments described above, the case of using two power supplies has been described. However, when three or more sets of multiplexed power supplies are used, the description is omitted. The same effect as in the case of the present invention can be obtained, and the reliability of the power supply can be further improved. However, it is needless to say that this case is also included in the present invention.
[0071]
【The invention's effect】
As described above, the automatic power supply multiplexing device of the present invention can automatically switch and connect one power supply to a load without short-circuiting a plurality of power supplies to each other. The effect is that it can be recognized.
[Brief description of the drawings]
FIG. 1 is a schematic circuit diagram showing a first embodiment of the automatic power supply multiplexing device of the present invention.
FIG. 2 is a schematic circuit diagram showing a second embodiment of the automatic power supply multiplexing device of the present invention.
FIG. 3 is a diagram showing a relay state detection circuit.
FIG. 4 is a circuit diagram showing a conventional automatic power supply multiplexing device.
[Explanation of symbols]
9, 19 Relay state detection circuit
91 Filter Circuit
92 comparator
93 NAND circuit
10, 60, 140 Automatic power supply multiplexer
E1, E2 power supply
21 Commercial power supply
22 Engine generator
31 UPS (Uninterruptible AC Power Supply)
32, 82 Information processing device
150 load
71 First DC power supply
72 Second DC power supply
81 UPS (Uninterruptible DC Power Supply)
RL1, RL2 relay
RL5, RL6 Relay
RL13, RL14 Relay
rl1 RL1 contact
rl2 RL2 contact
rl5 RL5 contact
rl6 RL6 contact
rl13 RL13 contact
rl14 RL14 contact
r11, r12, r15 contacts
r23, r24, r25 contacts
r51, r53 contact
r62, r63 contact
r131, r132 contact
r143, r144 contact
r13, r14 contact
r21, r22 contact
r52, r61 contacts
r133, r134 contact
r141, r142 contact
P1, P2, P3 Connection points
P11, P12, P13 Connection point
S1, S2 state detection signal
S5, S6 state detection signal

Claims

In order to connect one set of the live state among the n sets (n ≧ 2) of the power supply lines connected to the n power supplies to the load, one relay coil and n An automatic power supply multiplexing apparatus connected to the contacts of the plurality of relays, further comprising a state signal detecting means for detecting a state of a contact of at least one of the n relays. Multiplexer.

In order to connect one set of the live state among the n sets (n ≧ 2) of the power supply lines connected to the n power supplies to the load, one relay coil and n In the automatic power supply multiplexing apparatus connected to the contacts of the relays, the relays connected to the m-th set (1 ≦ m ≦ n) of the power supply lines may include a make contact to the m-th set of power supply lines, All of the power lines except the m-th group have break contacts, and the coils of the relay connected to the m-th group of the power lines are connected to the first to m-1st pairs of the power lines, respectively. The make contact of the relay connected to the load side of the break contact of the relay and connected to the mth set of power supply lines and the relay connected to the (m + 1) th set to the nth set of power supply lines. One of n power lines connected to a power supply side of the break contact; The connected to a load, n-number of automatic power multiplexing apparatus characterized by having a state signal detecting means for detecting the state of contact of at least one of said relay of said relay.

In order to connect a live set of two power supply lines connected to two power supplies to a load, two sets of the power supply lines each have one relay coil and two relays. In the automatic power supply multiplexing device having connected contacts, the first relay connected to the first set of power lines has a make contact on the first set of power lines and a break contact on the second set of power lines. A second relay connected to the second set of power lines has a make contact on the second set of power lines, a break contact on the first set of power lines, and a second relay of the second relay. The coil is connected to the load side of the break contact of the first relay, and is connected to the power supply side of the make contact of the second relay and the break contact of the second relay. Connecting any one of the power supply lines to the load; Automatic power multiplexing apparatus characterized by having a state signal detecting means for detecting the state of at least one contact of the said second relay.

The connection of one of the n sets of power supply lines to the load is performed when the power supply to all of the first to m-1 sets of power supply lines is interrupted. 3. The automatic power supply multiplexing apparatus according to claim 2, wherein all of the (m + 1) th to nth sets of the power supply lines are not connected to the load.

The automatic power multiplexing device according to claim 3, wherein both the first relay and the second relay have five contacts.

6. The automatic power supply multiplexing device according to claim 3, wherein each of the first relay and the second relay has three make contacts and two break contacts.

The automatic power supply multiplexing device according to claim 3, wherein each of the first relay and the second relay has three contacts.

8. The automatic power supply multiplexing device according to claim 3, wherein each of the first relay and the second relay has two make contacts and one break contact.

4. The automatic power supply multiplexing apparatus according to claim 3, wherein said state signal detecting means detects a state of said make contact.

10. The automatic power supply multiplexing apparatus according to claim 3, wherein said state signal detecting means includes means for outputting a low level signal when said make contact is short-circuited and outputting a high level signal when said make contact is opened.

The automatic power supply multiplexing device according to claim 3, wherein the power supply includes an AC commercial power supply and an engine generator.

The automatic power supply multiplexing device according to claim 3, wherein the power supply includes a first DC power supply generated from a commercial power supply and a second DC power supply backed up by a battery.

The automatic power supply multiplexing device according to claim 3, wherein the load has an information processing device, and the information processing device is connected to the power supply via an uninterruptible power supply device.