Electronic switch for quick, automatic response to current...

H - Electricity – 01 – H

Patent

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Details

H01H 73/00 (2006.01) H01H 9/54 (2006.01) H01H 47/14 (2006.01) H02H 3/02 (2006.01)

Patent

CA 2302945

An electronic switch circuit (10) including an electromagnetic relay device (18) having an electromagnet (20) and at least two contacts (21), a controlled semiconductor device (22), a semiconductor command circuit (24) for controlling the controlled semiconductor device (22), a relay command circuit (28) for controlling the relay device (18) and the semiconductor command circuit (24), an overload sensor (26) for reporting the relay command circuit (28) of a current overload, a resistor (32), and an inducer (34); wherein when the contacts (21) are disconnected, the resistor (32) experiences a higher current load, automatically signals the semiconductor command circuit (24), which turns the controlled semiconductor device (22) off; and further wherein the inducer (34) generates an induction field of a magnitude sufficient to induce the electromagnet (20) of the electromagnetic relay device (18) to disconnect the contacts when the inducer (34) experiences a current overload above a predetermined threshold.

Cette invention se rapporte à un circuit de commutation électronique (10), qui comprend un dispositif relais électromagnétique (18) comportant un électro-aimant (20) et au moins deux contacts (21), un dispositif à semi-conducteur contrôlé (22), un circuit de commande de semi-conducteur (24) destiné à contrôler le dispositif à semi-conducteur contrôlé (22), un circuit de commande de relais (28) destiné à contrôler le dispositif relais (18) et le circuit de commande de semi-conducteur (24), un capteur de surcharge (26) servant à informer le circuit de commande de relais (28) d'une surcharge de courant, une résistance (32), ainsi qu'un inducteur (34). Ainsi, lorsque les contacts (21) sont coupés, la résistance (32) subit une charge de courant plus élevée, automatiquement signalée au circuit de commande de semi-conducteur (24), lequel met hors tension le dispositif à semi-conducteur contrôlé (22), et, en outre, l'inducteur (34) génère un champ d'inducteur d'une amplitude suffisante pour amener l'électro-aimant (20) du dispositif relais électromagnétique (28) à couper les contacts, lorsque l'inducteur (34) subit une surcharge de courant supérieure à un seuil prédéterminé.

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