JP3627458B2

JP3627458B2 - Drive output monitoring circuit

Info

Publication number: JP3627458B2
Application number: JP20505897A
Authority: JP
Inventors: 哲郎内田
Original assignee: Mitsumi Electric Co Ltd
Current assignee: Mitsumi Electric Co Ltd
Priority date: 1997-07-30
Filing date: 1997-07-30
Publication date: 2005-03-09
Anticipated expiration: 2017-07-30
Also published as: JPH1153037A

Description

【０００１】
【発明の属する技術分野】
本発明は駆動出力監視回路に係り、特に、動作開始時に負荷の状態を検出し、駆動出力の監視を行う駆動出力監視回路に関する。
【０００２】
【従来の技術】
図４に従来の駆動出力監視回路の一例のブロック構成図を示す。
従来の駆動出力監視回路１は、駆動電源２と負荷３−１〜３−ｎとの間に接続されて、動作開始時に負荷３−１〜３−ｎの抵抗を測定することにより負荷３−１〜３−ｎのそれぞれの状態を検出する。
【０００３】
駆動出力監視回路１は、負荷３−１〜３−ｎから１つを選択する負荷選択回路１１、負荷３−１〜３−ｎの抵抗を測定する抵抗測定装置１２、負荷３−１〜３−ｎへの接続を駆動電源２又は抵抗測定装置１２に切り替えるスイッチ１３、動作開始時に負荷選択回路１１及びスイッチ１３を制御して、抵抗測定装置１２で測定された各負荷３−１〜３−ｎの測定抵抗に応じて各負荷３−１〜３−ｎに状態を判定する制御判断部１４、制御判断部１４での判断結果を表示する表示部１５から構成される。
【０００４】
負荷選択回路１１は、ＮＰＮトランジスタＱ１〜Ｑｎから構成される。ＮＰＮトランジスタＱ１〜Ｑｎは、コレクタが負荷３−１〜３−ｎの接地端子に接続され、エミッタが接地され、ベースが制御判断部１４に接続される。トランジスタＱ１〜Ｑｎは制御判断部１４からの制御信号に応じてスイッチングされ、抵抗測定装置１２に接続される負荷を負荷３−１〜３−ｎから選択する。
【０００５】
負荷３−１〜３−ｎの電源供給端子は、共通電源ラインＬ０に接続される。共通電源ラインＬ０は、切換手段１３の可動接点ａに接続される。
切換手段１３の固定接点ｂは、駆動電源２に接続され、固定接点ｃは、抵抗測定装置１２に接続される。切換手段１３の可動接点ａは、制御判断部１４からの制御信号に応じて切り換えられる。
【０００６】
抵抗測定装置１２は、負荷３−１〜３−ｎのそれぞれに微小電流を供給し、負荷３−１〜３−ｎそれぞれの抵抗値を検出する。抵抗測定装置１２は、検出した負荷３−１〜３−ｎの抵抗値をディジタルデータに変換して制御判断部１４に供給する。
制御判断部１４は、抵抗測定装置１２から供給されるディジタルデータに応じて負荷３−１〜３−ｎそれぞれの短絡、切断、抵抗値異常などの状態を検出して、表示部１５に表示する。
【０００７】
図５に従来の駆動出力監視装置の一例の制御判断部のフローチャートを示す。制御判断部１４は、動作開始時に、まず、切換手段１３の可動接点ａを固定接点ｃに接続し、共通電源ラインＬ０に抵抗測定装置１２を接続する（ステップＳ３−１，Ｓ３−２）。
次に、制御判断部１４は、負荷３−１〜３−ｎを選択する負荷選択番号Ｎを「１」にリセットする（ステップＳ３−３）。次に、制御判断部１４は、負荷選択回路１１のステップＳ３−３で選択された選択番号Ｎに対応するトランジスタＱＮをオンし、他のトランジスタをオフする（ステップＳ３−４）。ステップ３−４により、負荷３−Ｎに抵抗測定装置１２から測定用微小電流Ｉｍが供給される。
【０００８】
制御判断部１４は、このとき、抵抗測定装置１２で検出された測定抵抗値Ｒｓを入力し、内部に予め設定された上限値Ｒ１及び下限値Ｒ２と比較する（ステップＳ３−６，Ｓ３−７）。
ステップＳ３−６で、測定抵抗値Ｒｓが下限抵抗値Ｒ１より小さいと判断された場合には、負荷３−Ｎは短絡していると判断する（ステップＳ３−８）。
【０００９】
また、ステップＳ３−７で、測定抵抗値Ｒｓが上限抵抗値Ｒ２より大きいと判断された場合には、負荷３−Ｎは切断していると判断する（ステップＳ３−９）。
さらに、ステップＳ３−６，Ｓ３−７で、測定抵抗値Ｒｓが下限抵抗値Ｒ１と上限抵抗値Ｒ２との間にあると判断された場合には、次に、測定抵抗値Ｒｓが所定の範囲（Ｒ０ −ΔＲ３）＜Ｒｓ＜（Ｒ０＋ΔＲ３）内にあるか否かが判断される（ステップＳ３−１０）。
【００１０】
ステップＳ３−１０で、測定抵抗値Ｒｓが所定の範囲（Ｒ０ −ΔＲ３）＜Ｒｓ＜（Ｒ０＋ΔＲ３）内にあれば、負荷Ｎは正常であると判断され（ステップＳ３−１１）、測定抵抗値Ｒｓが所定の範囲（Ｒ０ −ΔＲ３）＜Ｒｓ＜（Ｒ０＋ΔＲ３）内になければ、負荷Ｎは抵抗値に異常があると判断される（ステップＳ３−１２）。
【００１１】
次に、上記のステップＳ３−６〜Ｓ３−１２での判定結果を表示部１５に表示する（ステップＳ３−１３）。このとき、表示部１５には、負荷３−１〜３−ｎを識別するための負荷番号Ｎ及び負荷番号Ｎに対応する判定結果が表示され、どの負荷にどんな異常があるかが容易にわかるような表示が行われる。
上記ステップＳ３−４〜Ｓ３−１３が負荷の数ｎ回繰り返し行われ、負荷３−１〜３−Ｎそれぞれの状態が検出される（ステップＳ３−１４，Ｓ３−１５）。
【００１２】
以上により、動作開始時の検査処理が終了する。
負荷３−１〜３−ｎの検査後、全ての負荷３−１〜３−ｎが正常であれば、切換手段１３の可動接点ａを固定接点ｂに接続し、負荷３−１〜３−ｎに駆動電源２を接続する（ステップＳ３−１６，Ｓ３−１７）。
なお、検査後、切換手段１３の可動接点ａを固定接点ｂに接続され、負荷３−１〜３−ｎに駆動電源２を接続されると、抵抗測定装置１２は負荷３−１〜３−ｎから切断され、負荷３−１〜３−ｎの抵抗は測定できなくなる。
【００１３】
【発明が解決しようとする課題】
しかるに、従来の駆動出力監視回路１では、駆動電源２と負荷３−１〜３−ｎとが接続されている状態では、抵抗測定装置１２が負荷３−１〜３−ｎから切断されるため、動作後は負荷３−１〜３−ｎの監視が行えず、動作後の異常は検出できない等の問題点があった。
【００１４】
本発明は上記の点に鑑みてなされたもので、動作開始時には負荷毎に、また、動作後でも常時負荷の監視が可能となる駆動出力監視回路を提供することを目的とする。
【００１５】
【課題を解決するための手段】
本発明の請求項１は、駆動電源により駆動される負荷の状態を監視する駆動出力監視回路において、
前記駆動電源と前記負荷との間に接続され、前記負荷に供給される電流を測定する電流測定手段と、
前記負荷に前記電流測定手段を介して測定電流を供給する測定電源と、
前記負荷に前記電流測定手段を介して供給する電源を前記駆動電源と前記測定電源とのいずれか一方から選択する切換手段と、
前記駆動電源を前記負荷に供給する前に、前記負荷に前記測定電源が供給されるように前記切換手段を切り換え、前記電流測定手段により前記測定電源から供給される電流値を測定し、その測定結果に応じて異常又は正常判定を行い、異常判定されたときには負荷への前記電源供給を停止し、正常判定されたときには前記負荷に前記駆動電源が供給されるように前記切換手段を切り換え、前記駆動電源により前記負荷を駆動させ、前記電流測定手段により前記駆動電源から供給される電流値を測定し、その測定結果、前記駆動電源から供給される電流値が所定範囲内の値でなくなったときには、前記負荷への電源供給を停止する制御判断手段を有することを特徴とする。
【００１６】
請求項１によれば、駆動電源を前記負荷に供給する前に、負荷に測定電源を供給し、負荷に測定電源から供給される電流値を測定し、その測定結果に応じて異常又は正常判定を行い、異常判定されたときには負荷への電源供給を停止し、正常判定されたときには負荷に駆動電源を供給し、負荷を駆動しつつ、電流測定手段により負荷に駆動電源から供給される電流値を測定し、その測定結果、駆動電源から負荷に供給される電流値が所定範囲内の値でなくなったときには、負荷への電源供給を停止することにより、負荷の状態監視を常時監視して、負荷への電源供給を停止できる。
【００１７】
請求項２は、駆動電源により駆動される複数の負荷の状態を監視する駆動出力監視回路において、
前記駆動電源と前記複数の負荷との間に接続され、前記複数の負荷に供給される電流を測定する電流測定手段と、
前記複数の負荷から所望の負荷を選択的に前記電流測定手段に接続する負荷選択手段と、前記複数の負荷に前記電流測定手段を介して測定電流を供給する測定電源と、
前記複数の負荷に前記電流測定手段を介して供給する電源を前記駆動電源と前記測定電源とのいずれか一方から選択する切換手段と、
前記駆動電源を前記複数の負荷に供給する前に、前記複数の負荷に前記測定電源が供給されるように前記切換手段を切り換え、前記電流測定手段により前記測定電源から供給される電流値を測定し、その測定結果に応じて前記複数の負荷各々の異常又は正常判定を行い、前記複数の負荷のうち異常判定された負荷への前記駆動電源の供給は行なわず、正常判定された負荷に前記駆動電源が供給されるように前記切換手段を切り換え、前記駆動電源により前記負荷を駆動させ、前記電流測定手段により前記駆動電源から供給される電流値を測定し、その測定結果、前記駆動電源から供給される電流値が所定範囲内の値でなくなったときには、前記複数の負荷すべてへの電源供給を停止する制御判断手段とを有することを特徴とする。
【００１８】
請求項２によれば、駆動電源を前記複数の負荷に供給する前に、複数の負荷に測定電源を供給し、その測定結果に応じて複数の負荷各々の異常又は正常判定を行い、複数の負荷のうち異常判定された負荷への駆動電源の供給を停止し、正常判定された負荷にのみ駆動電源を供給し、駆動電源が負荷に供給された後は、駆動電源から各負荷に供給される電流値を測定し、その測定結果、駆動電源から供給される電流値が所定範囲内の値でなくなったときには、複数の負荷すべてへの電源供給を停止することにより、負荷の状態監視を常時監視して、負荷への電源供給を停止できる。
【００１９】
請求項３は、前記制御判断手段が、前記駆動電源を前記複数の負荷に供給する際に、前記駆動電源を前記負荷に供給する前の前記複数の負荷それぞれに対する検査で異常が検出された負荷に応じて前記複数の負荷への前記駆動電源の供給を制御することを特徴とする。
請求項３によれば、駆動電源を複数の負荷に供給する際に、駆動電源を負荷に供給する前の複数の負荷それぞれに対する検査で異常が検出された負荷に応じて複数の負荷への駆動電源の供給を制御することにより、正常な動作が可能な動作を停止させることなく行わせることができる。
【００２０】
【発明の実施の形態】
図１に本発明の駆動出力監視回路の一実施例のブロック構成図を示す。
本実施例の駆動出力監視回路１００は、負荷３−１〜３−ｎの接続を制御する負荷選択回路１１０、負荷３−１〜３−ｎに供給される電流を測定する電流測定装置１２０、動作開始時に負荷３−１〜３−ｎに測定電流を供給する測定用電源１３０、負荷３−１〜３−ｎの電源を駆動電源２又は測定電源１３０に切り換える切換手段１４０、後述するように動作開始時に負荷選択回路１１０及び切換手段１４０を制御し、電流測定回路１１０で検出された各負荷３−１〜３−ｎに流れる電流に応じて各負荷３−１〜３−ｎの状態を判断するとともに、動作後は負荷３−１〜３−ｎに流れる電流を電流測定回路１１０により常時検出して、負荷３−１〜３−ｎの状態を判断する制御判断部１５０、制御判断部１５０での判断結果を表示する表示部１６０、動作開始を指示する動作開始スイッチ１７０から構成される。
【００２１】
負荷選択回路１１０は、負荷３−１〜３−ｎに対応して設けられたＮＰＮトランジスタＱ１〜Ｑｎから構成される。トランジスタＱ１は、コレクタが負荷３−１の接地側端子に接続され、エミッタが接地され、ベースが制御判断部１５０に接続される。同様にトランジスタＱ２〜Ｑｎは、コレクタが負荷３−２〜３−ｎの接地側端子に接続され、エミッタが接地され、ベースが制御判断部１５０に接続される。
【００２２】
トランジスタＱ１〜Ｑｎは、制御判断部１５０によりそれぞれのベース電位が制御され、スイッチングされる。トランジスタＱ１〜Ｑｎが選択的にオンされることにより、負荷３−１〜３−ｎの接地側端子が接地され、負荷３−１〜３−ｎに選択的に測定電流が供給されることになる。
電流測定装置１２０は、一端に負荷３−１〜３−ｎの電源端子が共通に接続された共通電源ラインＬ０に直列に接続され、共通電源ラインＬ０に流れる電流を測定し、ディジタルデータに変換して、制御判断部１５０に供給する。
【００２３】
共通電源ラインＬ０の他端は切換手段１４０の可動接点ａに接続される。切換手段１４０は、リレーから構成され、可動接点ａが共通電源ラインＬ０に接続され、固定接点ｂが駆動電源２に接続され、固定接点ｃが測定電源回路１３０に接続される。
切換手段１４０は、制御判断部１５０から供給される切換信号に応じて可動接点ａが固定接点ｂ又はｃに接続され、共通電源ラインＬ０に供給される電流の供給元を切り換える。測定電源回路１３０は、定電圧源１３０ａ及び抵抗Ｒ０から構成され、切換手段１４０の可動接点ａが固定接点ｃに接続されたとき、共通電源ラインＬ０に測定用電流Ｉｍを供給する。
【００２４】
また、駆動電源２は、正極側が切換手段１４０の固定接点ｂに接続され、負極側が接続され、切換手段１４０の可動接点ａが固定接点ｂに接続されたとき、共通電源ラインＬ０に負荷３−１〜３−ｎを駆動するための駆動電流ＩＤを供給する。
制御判断部１５０は、動作開始スイッチ１７０の操作を検出することにより動作開始を検出し、切換手段１４０及び負荷選択回路１１０を制御して、各負荷３−１〜３−ｎの状態を検査し、異常の有無を検出する。
【００２５】
図２に本発明の駆動出力監視回路の一実施例の制御判断部のフローチャートを示す。
制御判断部１５０は、動作開始スイッチ１７０の操作を検出すると、まず、切換手段１４０の可動接点ａを固定接点ｃに接続し、共通電源ラインＬ０を測定用電源回路１３０に接続する（ステップＳ１−１，Ｓ１−２）。
【００２６】
次に、制御判断部１５０は、負荷３−１〜３−ｎを選択する負荷選択番号Ｎを「１」にリセットする（ステップＳ１−３）。次に、制御判断部１５０は、負荷選択回路１１０のステップＳ１−３で選択された選択番号Ｎに対応するトランジスタＱＮをオンし、他のトランジスタをオフする（ステップＳ１−４）。ステップ１−４により、負荷３−Ｎに測定用電源回路１３０から測定用電流Ｉｍが供給される。
【００２７】
制御判断部１５０は、このとき、電流測定装置１２０で検出され、ディジタルデータに変換された測定電流値Ｉｓを入力し、内部に予め設定された上限値Ｌ１及び下限値Ｌ２と比較する（ステップＳ１−５，Ｓ１−６，Ｓ１−７）。
ステップＳ１−６で、測定電流値Ｉｓが上限値Ｌ１より大きいと判断された場合には、負荷３−Ｎに所定値以上の電流が流れているので、負荷３−Ｎが短絡していると判断する（ステップＳ１−８）。
【００２８】
また、ステップＳ１−７で、測定電流値Ｉｓが下限値Ｌ２より小さいと判断された場合には、負荷３−Ｎに所定値以下の電流しか流れないので、負荷３−Ｎが切断していると判断する（ステップＳ１−９）。
さらに、ステップＳ１−６，Ｓ１−７で、測定電流値Ｉｓが上限値Ｌ１と下限値Ｌ２との間にあると判断された場合には、次に、測定電流値Ｉｓが所定の範囲（Ｌ０ −ΔＬ３）＜Ｉｓ＜（Ｌ０＋ΔＬ３）内にあるか否かが判断される（ステップＳ１−１０）。
【００２９】
ステップＳ１−１０で、測定電流値Ｉｓが所定の範囲（Ｌ０ −ΔＬ３）＜Ｉｓ＜（Ｌ０＋ΔＬ３）内にあれば、負荷Ｎは正常であると判断され（ステップＳ１−１１）、測定電流値Ｉｓが所定の範囲（Ｌ０ −ΔＬ３）＜Ｉｓ＜（Ｌ０＋ΔＬ３）内になければ、負荷Ｎは抵抗値に異常があると判断される（ステップＳ１−１２）。
【００３０】
次に、上記のステップＳ１−６〜Ｓ１−１２での判定結果を表示部１６０に表示する（ステップＳ１−１３）。このとき、表示部１６０には、負荷３−１〜３−ｎを識別するための負荷番号Ｎ及び負荷番号Ｎに対応する判定結果が表示され、どの負荷にどんな異常があるかが容易にわかるような表示が行われる。
上記ステップＳ１−４〜Ｓ１−１３が負荷の数ｎ回繰り返し行われ、負荷３−１〜３−Ｎそれぞれの状態が検出される（ステップＳ１−１４，Ｓ１−１５）。
【００３１】
以上により、動作開始時の検査処理が終了する。
次に、制御判断部１５０は、負荷選択回路１１０のトランジスタＱ１〜ＱＮのうち、上記ステップＳ１−４〜Ｓ１−１５で異常判定された負荷及びそれに関連する負荷に対応するトランジスタをオンにしない、すなわち、ディセーブルし、正常判定され、かつ、異常判定された負荷と関連して動作しない負荷に対応するトランジスタをオンにできる設定を行った後、切換手段１４０の可動接点ａを固定接点ｂに接続し、動作可能な負荷に駆動電源２を印加して、動作を行わせる（ステップＳ１−１６，Ｓ１−１７）。
【００３２】
制御判断部１５０は、動作後、動作停止操作が行われるまで、電流測定装置１２０により測定される測定電流Ｉｓ ’を監視して常時監視処理を行う（ステップＳ１−１８，Ｓ１−１９）。
ここで、ステップＳ１−１８の動作後の監視処理について図面とともに説明する。図３に本発明の一実施例の制御判断部の監視処理のフローチャートを示す。
【００３３】
監視処理では、まず、電流測定装置１２０により測定される負荷３−１〜３−Ｎのうち動作中の負荷に供給される電流Ｉｓ ’を入力する（ステップＳ２−１）。
制御判断部１５０は、入力された測定電流値Ｉｓ ’を内部に予め設定された上限値ＬＳ１１及び下限値ＬＳ１２と比較する（ステップＳ２−２）。
【００３４】
ステップＳ２−２で、測定電流値Ｉｓ ’が所定の範囲ＬＳ１１＜Ｉｓ ’＜ＬＳ１２内にあれば、負荷Ｎは正常であると判断され、ステップＳ２−１に戻って、動作が続行される。また、測定電流値Ｉｓ ’が所定の範囲ＬＳ１１＜Ｉｓ ’＜ＬＳ１２内になければ、動作中の負荷のいずれかに抵抗値に異常があると判断される（ステップＳ２−３）。
【００３５】
ステップＳ２−２で動作中の負荷に異常が生じた場合には、負荷選択回路１１０のトランジスタＱ１〜Ｑｎを全てオフして、負荷３−１〜３−ｎへの電流の供給を停止して、判定結果を表示部１６０に表示させる（ステップＳ２−４，Ｓ２−５）。
以上本実施例によれば、動作開始時には負荷選択回路１１０により負荷３−１〜３−ｎを順次選択して、負荷３−１〜３−ｎに共通に接続された共通電源ラインＬ０に直列に接続された電流測定装置１２０により各負荷に供給される電流を検出し、各負荷の短絡、切断、抵抗値異常等の状態を検出し、警告を発することができる。
【００３６】
また、駆動電源２を負荷３−１〜３−ｎに接続した後でも、電流測定装置１２０は、共通電源ラインＬ０に直列に接続されているので、駆動電源２から動作中の負荷に供給される電流を電流測定装置１２０により測定できる。このため、動作後の負荷の異常を検出できる。
【００３７】
【発明の効果】
上述の如く、本発明の請求項１によれば、駆動電源を前記負荷に供給する前に、負荷に測定電源を供給し、負荷に測定電源から供給される電流値を測定し、その測定結果に応じて異常又は正常判定を行い、異常判定されたときには負荷への電源供給を停止し、正常判定されたときには負荷に駆動電源を供給し、負荷を駆動しつつ、電流測定手段により負荷に駆動電源から供給される電流値を測定し、その測定結果、駆動電源から負荷に供給される電流値が所定範囲内の値でなくなったときには、負荷への電源供給を停止することにより、負荷の状態監視を常時監視して、負荷への電源供給を停止できる等の特長を有する。
【００３８】
請求項２によれば、駆動電源を前記複数の負荷に供給する前に、複数の負荷に測定電源を供給し、その測定結果に応じて複数の負荷各々の異常又は正常判定を行い、複数の負荷のうち異常判定された負荷への駆動電源の供給を停止し、正常判定された負荷にのみ駆動電源を供給し、駆動電源が負荷に供給された後は、駆動電源から各負荷に供給される電流値を測定し、その測定結果、駆動電源から供給される電流値が所定範囲内の値でなくなったときには、複数の負荷すべてへの電源供給を停止することにより、負荷の状態監視を常時監視して、負荷への電源供給を停止できる等の特長を有する。
【００３９】
請求項３によれば、駆動電源を複数の負荷に供給する際に、駆動電源を負荷に供給する前の複数の負荷それぞれに対する検査で異常が検出された負荷に応じて複数の負荷への駆動電源の供給を制御することにより、正常な動作が可能な動作を停止させることなく行わせることができる等の特長を有する。
【図面の簡単な説明】
【図１】本発明の駆動出力監視回路の一実施例のブロック構成図である。
【図２】本発明の駆動出力監視回路の一実施例の制御判断部の動作フローチャートである。
【図３】本発明の駆動出力監視回路の一実施例の制御判断部の監視処理のフローチャートである。
【図４】従来の駆動出力監視回路の一例のブロック構成図である。
【図５】従来の駆動出力監視回路の一例の制御判断部の動作フローチャートである。
【符号の説明】
２駆動電源
３−１〜３−ｎ負荷
１００駆動出力監視回路
１１０負荷選択回路
１２０スイッチ
１３０測定用電源回路
１４０電流測定回路
１５０制御判断部
１６０表示部
Ｑ１〜ＱｎＮＰＮトランジスタ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive output monitoring circuit, and more particularly to a drive output monitoring circuit that detects the state of a load at the start of operation and monitors the drive output.
[0002]
[Prior art]
FIG. 4 is a block diagram showing an example of a conventional drive output monitoring circuit.
The conventional drive output monitoring circuit 1 is connected between the drive power supply 2 and the loads 3-1 to 3-n and measures the resistance of the load 3-3 by measuring the resistance of the loads 3-1 to 3-n at the start of operation. Each state 1-3 is detected.
[0003]
The drive output monitoring circuit 1 includes a load selection circuit 11 that selects one of the loads 3-1 to 3 -n, a resistance measurement device 12 that measures the resistance of the loads 3-1 to 3 -n, and the loads 3-1 to 3. Switch 13 for switching connection to -n to drive power supply 2 or resistance measuring device 12, load selection circuit 11 and switch 13 are controlled at the start of operation, and each load 3-1 to 3- The control determination unit 14 determines the state of each of the loads 3-1 to 3-n according to the measured resistance of n, and the display unit 15 displays the determination result of the control determination unit 14.
[0004]
The load selection circuit 11 includes NPN transistors Q1 to Qn. NPN transistors Q1 to Qn have collectors connected to the ground terminals of the loads 3-1 to 3-n, emitters grounded, and bases connected to the control determination unit 14. The transistors Q1 to Qn are switched according to a control signal from the control determination unit 14, and select a load connected to the resistance measuring device 12 from the loads 3-1 to 3-n.
[0005]
The power supply terminals of the loads 3-1 to 3-n are connected to the common power supply line L0. The common power supply line L0 is connected to the movable contact a of the switching means 13.
The fixed contact b of the switching means 13 is connected to the drive power source 2, and the fixed contact c is connected to the resistance measuring device 12. The movable contact a of the switching means 13 is switched according to a control signal from the control determination unit 14.
[0006]
The resistance measuring device 12 supplies a minute current to each of the loads 3-1 to 3-n and detects the resistance value of each of the loads 3-1 to 3-n. The resistance measurement device 12 converts the detected resistance values of the loads 3-1 to 3-n into digital data and supplies the digital data to the control determination unit 14.
The control determination unit 14 detects a state such as a short circuit, a disconnection, an abnormal resistance value, or the like of each of the loads 3-1 to 3-n according to the digital data supplied from the resistance measurement device 12 and displays the detected state on the display unit 15. .
[0007]
FIG. 5 shows a flowchart of a control determination unit of an example of a conventional drive output monitoring apparatus. At the start of operation, the control determination unit 14 first connects the movable contact a of the switching means 13 to the fixed contact c, and connects the resistance measuring device 12 to the common power supply line L0 (steps S3-1 and S3-2).
Next, the control determination unit 14 resets the load selection number N for selecting the loads 3-1 to 3-n to “1” (step S3-3). Next, the control determination unit 14 turns on the transistor QN corresponding to the selection number N selected in step S3-3 of the load selection circuit 11, and turns off the other transistors (step S3-4). In Step 3-4, the measurement minute current Im is supplied from the resistance measuring device 12 to the load 3-N.
[0008]
At this time, the control determination unit 14 inputs the measured resistance value Rs detected by the resistance measuring device 12 and compares the measured resistance value Rs with the upper limit value R1 and the lower limit value R2 set in advance therein (steps S3-6, S3-7). ).
When it is determined in step S3-6 that the measured resistance value Rs is smaller than the lower limit resistance value R1, it is determined that the load 3-N is short-circuited (step S3-8).
[0009]
If it is determined in step S3-7 that the measured resistance value Rs is greater than the upper limit resistance value R2, it is determined that the load 3-N is disconnected (step S3-9).
Furthermore, if it is determined in steps S3-6 and S3-7 that the measured resistance value Rs is between the lower limit resistance value R1 and the upper limit resistance value R2, then the measured resistance value Rs is within a predetermined range. It is determined whether or not it is within (R0−ΔR3) <Rs <(R0 + ΔR3) (step S3-10).
[0010]
If the measured resistance value Rs is within the predetermined range (R0−ΔR3) <Rs <(R0 + ΔR3) in step S3-10, it is determined that the load N is normal (step S3-11), and the measured resistance value. If Rs is not within the predetermined range (R0−ΔR3) <Rs <(R0 + ΔR3), it is determined that the load N has an abnormal resistance value (step S3-12).
[0011]
Next, the determination results in steps S3-6 to S3-12 are displayed on the display unit 15 (step S3-13). At this time, the display unit 15 displays the load number N for identifying the loads 3-1 to 3-n and the determination result corresponding to the load number N, so that it can be easily understood which load has what kind of abnormality. Is displayed.
Steps S3-4 to S3-13 are repeated n times as many times as the load, and the respective states of the loads 3-1 to 3-N are detected (steps S3-14 and S3-15).
[0012]
Thus, the inspection process at the start of the operation ends.
If all the loads 3-1 to 3-n are normal after the inspection of the loads 3-1 to 3-n, the movable contact a of the switching means 13 is connected to the fixed contact b, and the loads 3-1 to 3- The drive power supply 2 is connected to n (steps S3-16, S3-17).
After the inspection, when the movable contact a of the switching means 13 is connected to the fixed contact b, and the drive power source 2 is connected to the loads 3-1 to 3 -n, the resistance measuring device 12 is connected to the loads 3-1 to 3-. The resistance of the loads 3-1 to 3-n cannot be measured.
[0013]
[Problems to be solved by the invention]
However, in the conventional drive output monitoring circuit 1, the resistance measuring device 12 is disconnected from the loads 3-1 to 3-n when the drive power supply 2 and the loads 3-1 to 3-n are connected. After the operation, the loads 3-1 to 3-n cannot be monitored, and there is a problem that an abnormality after the operation cannot be detected.
[0014]
The present invention has been made in view of the above points, and an object of the present invention is to provide a drive output monitoring circuit that can always monitor a load for each load at the start of operation and even after the operation.
[0015]
[Means for Solving the Problems]
Claim 1 of the present invention is a drive output monitoring circuit for monitoring the state of a load driven by a drive power supply.
Current measuring means connected between the drive power supply and the load and measuring a current supplied to the load;
A measurement power source for supplying a measurement current to the load via the current measurement means;
Switching means for selecting a power supply to be supplied to the load via the current measurement means from either the drive power supply or the measurement power supply;
Before supplying the drive power to the load, the switching means is switched so that the measurement power is supplied to the load, and the current value supplied from the measurement power is measured by the current measurement means, and the measurement is performed. An abnormality or normality is determined according to a result, and when the abnormality is determined, the power supply to the load is stopped, and when the normality is determined, the switching unit is switched so that the driving power is supplied to the load, When the load is driven by the driving power source, the current value supplied from the driving power source is measured by the current measuring unit, and when the current value supplied from the driving power source is not within a predetermined range as a result of the measurement And control determining means for stopping power supply to the load .
[0016]
According to claim 1, before supplying drive power to the load, measurement power is supplied to the load, current value supplied from the measurement power supply to the load is measured, and abnormality or normality is determined according to the measurement result When the abnormality is determined, the power supply to the load is stopped. When the abnormality is determined, the drive power is supplied to the load. While driving the load, the current value supplied from the drive power to the load by the current measuring means When the current value supplied to the load from the drive power supply is no longer within the predetermined range, the load status monitoring is constantly monitored by stopping the power supply to the load, The power supply to the load can be stopped.
[0017]
Claim 2 is a drive output monitoring circuit for monitoring the state of a plurality of loads driven by a drive power supply.
A current measuring means connected between the drive power supply and the plurality of loads, and measuring a current supplied to the plurality of loads;
A load selection unit that selectively connected to the current measuring means a desired load from said plurality of loads, the measured supply that measured current through the current measuring means to the plurality of loads,
Switching means for selecting a power supply to be supplied to the plurality of loads via the current measurement means from either the drive power supply or the measurement power supply;
Before supplying the drive power to the plurality of loads, the switching unit is switched so that the measurement power is supplied to the plurality of loads, and the current value supplied from the measurement power by the current measurement unit is measured. And determining whether each of the plurality of loads is abnormal or normal according to the measurement result, and not supplying the drive power to the load determined to be abnormal among the plurality of loads, The switching means is switched so that driving power is supplied, the load is driven by the driving power, the current value supplied from the driving power by the current measuring means is measured, and the measurement result is obtained from the driving power. when the current value supplied is no longer the value of the predetermined range, and having a control determining means for stopping the power supply to all the plurality of loads.
[0018]
According to claim 2, before supplying drive power to the plurality of loads, measurement power is supplied to the plurality of loads, and abnormality or normality of each of the plurality of loads is determined according to the measurement result, Stop supplying the drive power to the load determined to be abnormal among the loads, supply the drive power only to the load determined to be normal, and after the drive power is supplied to the load, the drive power is supplied to each load. When the current value supplied from the drive power supply is no longer within the specified range, the power supply to all of the multiple loads is stopped to constantly monitor the load status. The power supply to the load can be stopped by monitoring.
[0019]
According to a third aspect of the present invention, when the control determination unit supplies the drive power to the plurality of loads, the load in which an abnormality is detected in the inspection of each of the plurality of loads before supplying the drive power to the load. And controlling the supply of the drive power to the plurality of loads according to the control.
According to claim 3, when driving power is supplied to a plurality of loads, driving to the plurality of loads is performed according to the load in which an abnormality is detected in each of the plurality of loads before supplying the driving power to the load. By controlling the supply of power, an operation capable of normal operation can be performed without stopping.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a block diagram of an embodiment of the drive output monitoring circuit of the present invention.
The drive output monitoring circuit 100 according to the present embodiment includes a load selection circuit 110 that controls connection of loads 3-1 to 3-n, a current measurement device 120 that measures current supplied to the loads 3-1 to 3-n, Measurement power supply 130 for supplying a measurement current to loads 3-1 to 3-n at the start of operation, switching means 140 for switching the power supply of loads 3-1 to 3-n to drive power supply 2 or measurement power supply 130, as will be described later At the start of operation, the load selection circuit 110 and the switching means 140 are controlled, and the state of each load 3-1 to 3-n is determined according to the current flowing through each load 3-1 to 3-n detected by the current measurement circuit 110. The control determination unit 150 and the control determination unit determine the state of the loads 3-1 to 3-n by always detecting the current flowing through the loads 3-1 to 3-n by the current measurement circuit 110 after the operation. Display unit for displaying the determination result at 150 60, it consists of the operation start switch 170 for instructing the start of operation.
[0021]
The load selection circuit 110 includes NPN transistors Q1 to Qn provided corresponding to the loads 3-1 to 3-n. The transistor Q1 has a collector connected to the ground-side terminal of the load 3-1, an emitter grounded, and a base connected to the control determination unit 150. Similarly, in the transistors Q2 to Qn, the collector is connected to the ground side terminals of the loads 3-2 to 3 -n, the emitter is grounded, and the base is connected to the control determination unit 150.
[0022]
The transistors Q <b> 1 to Qn are switched with their respective base potentials controlled by the control determination unit 150. By selectively turning on the transistors Q1 to Qn, the ground-side terminals of the loads 3-1 to 3-n are grounded, and the measurement current is selectively supplied to the loads 3-1 to 3-n. Become.
The current measuring device 120 is connected in series to a common power supply line L0 having one end connected to the power supply terminals of the loads 3-1 to 3-n in common, measures the current flowing through the common power supply line L0, and converts it into digital data. Then, the data is supplied to the control determination unit 150.
[0023]
The other end of the common power supply line L0 is connected to the movable contact a of the switching means 140. The switching means 140 is composed of a relay, the movable contact a is connected to the common power supply line L0, the fixed contact b is connected to the drive power supply 2, and the fixed contact c is connected to the measurement power supply circuit 130.
In the switching means 140, the movable contact a is connected to the fixed contact b or c in accordance with the switching signal supplied from the control determination unit 150, and switches the supply source of the current supplied to the common power supply line L0. The measurement power supply circuit 130 includes a constant voltage source 130a and a resistor R0, and supplies a measurement current Im to the common power supply line L0 when the movable contact a of the switching unit 140 is connected to the fixed contact c.
[0024]
The drive power source 2 has a positive side connected to the fixed contact b of the switching unit 140, a negative side connected, and the movable contact a of the switching unit 140 connected to the fixed contact b. A drive current ID for driving 1 to 3-n is supplied.
The control determination unit 150 detects the start of operation by detecting the operation of the operation start switch 170, controls the switching means 140 and the load selection circuit 110, and checks the state of each of the loads 3-1 to 3-n. Detect the presence or absence of abnormalities.
[0025]
FIG. 2 shows a flowchart of the control determination unit of an embodiment of the drive output monitoring circuit of the present invention.
When the control determination unit 150 detects the operation of the operation start switch 170, first, the movable contact a of the switching unit 140 is connected to the fixed contact c, and the common power supply line L0 is connected to the measurement power supply circuit 130 (step S1- 1, S1-2).
[0026]
Next, the control determination unit 150 resets the load selection number N for selecting the loads 3-1 to 3-n to “1” (step S1-3). Next, the control determination unit 150 turns on the transistor QN corresponding to the selection number N selected in step S1-3 of the load selection circuit 110 and turns off the other transistors (step S1-4). In step 1-4, the measurement current Im is supplied from the measurement power supply circuit 130 to the load 3-N.
[0027]
At this time, the control determination unit 150 inputs the measured current value Is detected by the current measuring device 120 and converted into digital data, and compares it with the upper limit value L1 and the lower limit value L2 set in advance therein (step S1). -5, S1-6, S1-7).
If it is determined in step S1-6 that the measured current value Is is greater than the upper limit value L1, a current greater than or equal to a predetermined value flows through the load 3-N, so that the load 3-N is short-circuited. Judgment is made (step S1-8).
[0028]
If it is determined in step S1-7 that the measured current value Is is smaller than the lower limit value L2, only a current equal to or less than a predetermined value flows through the load 3-N, so the load 3-N is disconnected. (Step S1-9).
Furthermore, if it is determined in steps S1-6 and S1-7 that the measured current value Is is between the upper limit value L1 and the lower limit value L2, then the measured current value Is is within a predetermined range (L0). It is determined whether or not −ΔL3) <Is <(L0 + ΔL3) (step S1-10).
[0029]
If the measured current value Is is within the predetermined range (L0−ΔL3) <Is <(L0 + ΔL3) in step S1-10, it is determined that the load N is normal (step S1-11), and the measured current value is determined. If Is is not within the predetermined range (L0−ΔL3) <Is <(L0 + ΔL3), it is determined that the load N has an abnormal resistance value (step S1-12).
[0030]
Next, the determination results in steps S1-6 to S1-12 are displayed on display unit 160 (step S1-13). At this time, the display unit 160 displays the load number N for identifying the loads 3-1 to 3-n and the determination result corresponding to the load number N, so that it can be easily understood which load has what kind of abnormality. Is displayed.
The above steps S1-4 to S1-13 are repeated n times as many times as the load, and the respective states of the loads 3-1 to 3-N are detected (steps S1-14 and S1-15).
[0031]
Thus, the inspection process at the start of the operation ends.
Next, among the transistors Q1 to QN of the load selection circuit 110, the control determination unit 150 does not turn on the transistors corresponding to the loads determined to be abnormal in the above steps S1-4 to S1-15 and the loads related thereto. That is, after the setting is made so that the transistor corresponding to the load that is disabled and is normally determined and does not operate in relation to the load that is determined to be abnormal can be turned on, the movable contact a of the switching unit 140 is changed to the fixed contact b. The drive power supply 2 is applied to the operable load and operated, and the operation is performed (steps S1-16 and S1-17).
[0032]
After the operation, the control determination unit 150 monitors the measured current Is ′ measured by the current measuring device 120 and performs a constant monitoring process until an operation stop operation is performed (steps S1-18 and S1-19).
Here, the monitoring process after the operation of step S1-18 will be described with reference to the drawings. FIG. 3 shows a flowchart of the monitoring process of the control determination unit of one embodiment of the present invention.
[0033]
In the monitoring process, first, the current Is ′ supplied to the operating load among the loads 3-1 to 3-N measured by the current measuring device 120 is input (step S2-1).
The control determination unit 150 compares the input measured current value Is ′ with an upper limit value LS11 and a lower limit value LS12 set in advance inside (step S2-2).
[0034]
If the measured current value Is ′ is within the predetermined range LS11 <Is ′ <LS12 in step S2-2, it is determined that the load N is normal, the process returns to step S2-1, and the operation is continued. If the measured current value Is ′ is not within the predetermined range LS11 <Is ′ <LS12, it is determined that one of the operating loads has an abnormality in resistance value (step S2-3).
[0035]
If an abnormality occurs in the operating load in step S2-2, all the transistors Q1 to Qn of the load selection circuit 110 are turned off, and the current supply to the loads 3-1 to 3-n is stopped. The determination result is displayed on the display unit 160 (steps S2-4 and S2-5).
As described above, according to the present embodiment, when the operation is started, the loads 3-1 to 3-n are sequentially selected by the load selection circuit 110 and are connected in series to the common power supply line L0 commonly connected to the loads 3-1 to 3-n. The current supplied to each load is detected by the current measuring device 120 connected to the, and it is possible to detect a state such as a short circuit, a disconnection, a resistance value abnormality, etc. of each load and issue a warning.
[0036]
Even after the drive power supply 2 is connected to the loads 3-1 to 3-n, the current measuring device 120 is connected in series to the common power supply line L0, so that it is supplied from the drive power supply 2 to the operating load. Current can be measured by the current measuring device 120. For this reason, it is possible to detect a load abnormality after the operation.
[0037]
【The invention's effect】
As described above, according to claim 1 of the present invention , the measurement power supply is supplied to the load before the drive power supply is supplied to the load, the current value supplied from the measurement power supply to the load is measured, and the measurement result The power supply to the load is stopped when the abnormality is determined, the drive power is supplied to the load when the abnormality is determined, and the load is driven by the current measuring means while driving the load. When the current value supplied from the power supply is measured, and the current value supplied from the drive power supply to the load is no longer within the specified range, the power supply to the load is stopped. It has features such as being able to stop monitoring and constantly stop power supply to the load.
[0038]
According to claim 2, before supplying drive power to the plurality of loads, measurement power is supplied to the plurality of loads, and abnormality or normality of each of the plurality of loads is determined according to the measurement result, Stops supplying the drive power to the load determined to be abnormal among the loads, supplies the drive power only to the load determined to be normal, and after the drive power is supplied to the load, it is supplied from the drive power to each load. When the current value supplied from the drive power supply is no longer within the specified range, the power supply to all of the multiple loads is stopped to constantly monitor the load status. It has features such as monitoring and stopping power supply to the load.
[0039]
According to claim 3, when driving power is supplied to a plurality of loads, driving to the plurality of loads is performed according to the load in which an abnormality is detected in each of the plurality of loads before supplying the driving power to the load. By controlling the supply of power, an operation capable of normal operation can be performed without stopping.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of a drive output monitoring circuit of the present invention.
FIG. 2 is an operation flowchart of a control determination unit of an embodiment of the drive output monitoring circuit of the present invention.
FIG. 3 is a flowchart of a monitoring process of a control determination unit of an embodiment of the drive output monitoring circuit of the present invention.
FIG. 4 is a block diagram of an example of a conventional drive output monitoring circuit.
FIG. 5 is an operation flowchart of a control determination unit of an example of a conventional drive output monitoring circuit.
[Explanation of symbols]
2 Drive power supply 3-1 to 3-n Load 100 Drive output monitoring circuit 110 Load selection circuit 120 Switch 130 Power supply circuit for measurement 140 Current measurement circuit 150 Control judgment unit 160 Display unit Q1 to Qn NPN transistor

Claims

In the drive output monitoring circuit that monitors the state of the load driven by the drive power supply,
Current measuring means connected between the drive power supply and the load and measuring a current supplied to the load;
A measurement power source for supplying a measurement current to the load via the current measurement means;
Switching means for selecting a power supply to be supplied to the load via the current measurement means from either the drive power supply or the measurement power supply;
Before supplying the drive power to the load, the switching means is switched so that the measurement power is supplied to the load, and the current value supplied from the measurement power is measured by the current measurement means, and the measurement is performed. An abnormality or normality is determined according to a result, and when the abnormality is determined, the power supply to the load is stopped, and when the normality is determined, the switching unit is switched so that the driving power is supplied to the load, When the load is driven by the driving power source, the current value supplied from the driving power source is measured by the current measuring unit, and when the current value supplied from the driving power source is not within a predetermined range as a result of the measurement A drive output monitoring circuit comprising control judgment means for stopping power supply to the load .

In a drive output monitoring circuit that monitors the state of a plurality of loads driven by a drive power supply,
Current measuring means connected between the drive power supply and the plurality of loads, and measuring current supplied to the plurality of loads;
A load selection unit that selectively connected to the current measuring means a desired load from said plurality of loads, the measured supply that measured current through the current measuring means to the plurality of loads,
Switching means for selecting a power supply to be supplied to the plurality of loads via the current measurement means from either the drive power supply or the measurement power supply;
Before supplying the drive power to the plurality of loads, the switching unit is switched so that the measurement power is supplied to the plurality of loads, and the current value supplied from the measurement power by the current measurement unit is measured. And determining whether each of the plurality of loads is abnormal or normal according to the measurement result, and not supplying the drive power to the load determined to be abnormal among the plurality of loads, The switching means is switched so that driving power is supplied, the load is driven by the driving power, the current value supplied from the driving power by the current measuring means is measured, and the measurement result is obtained from the driving power. when the current value supplied is no longer the value of the predetermined range, driving output monitoring, characterized in that a control determination unit that stops supplying power to all the plurality of loads Road.

The control determining means, when supplying the drive power to the plurality of loads, the plurality of the plurality of loads according to the load in which an abnormality is detected in the inspection of each of the plurality of loads before supplying the drive power to the loads. The drive output monitoring circuit according to claim 2, wherein the drive power supply to the load is controlled.