Contact status monitor

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Patent

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Details

G01R 31/00 (2006.01) H01H 9/16 (2006.01) H01H 47/00 (2006.01)

Patent

CA 2093064

A circuit which gives a continuous voltage output indication of whether a contact is open or closed. The circuit senses the voltage across the contact to detect whether the contact is open or closed. When there is a significant voltage, the circuit indicates that the contact is open. When the voltage is negligible, the circuit indicates that the contact is closed. Alternatively, the current through the contact can be sensed to provide an indication of whether the contact is conducting or not. The circuit can be used to indicate welding closed of a relay contact in which case power to the load can be turned off or the contact can be opened by other than normal means. One application is to discontinue closing movement of a garage door when the motor relay switch does not open as desired, but there are innumerable other applications.

La présente invention se rapporte à un circuit qui fournit une tension indicatrice de l'ouverture ou de la fermeture d'un contact. Le circuit détecte la tension qui traverse le contact, que celui-ci soit ouvert ou fermé. Lorsqu'un tension appréciable est détectée, le circuit indique que le contact est ouvert. Lorsqu'une tension négligeable est détectée, le circuit indique que le contact est fermé. Alternativement, le courant qui traverse le contact peut être utilisé pour fournir une indication à savoir si le contact est conducteur ou non. Le circuit peut être utilisé pour indiquer l'état de fusion d'un contact de relais, auquel cas l'alimentation serait coupée ou l'ouverture du contact pourrait être réalisée par recours à des moyens extraordinaires. L'interruption du mouvement de fermeture d'une porte de garage dont le contacteur-relais moteur serait coincé en position fermée figure parmi les innombrables applications possibles.

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