Intrinsically safe communications circuit

H - Electricity – 02 – H

Patent

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Details

H02H 9/00 (2006.01) H04L 12/10 (2006.01)

Patent

CA 2686679

An electrical circuit comprising a power supply, a load, a pair of parallel positive cables between the power supply and the load, a pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, comprising : monitoring means adapted to detect if the current and/or voltage in one of the pair of cables deviates from the other, and a control means adapted to fully or partially isolate the power supply from the pair of cables if the monitoring means detects that their current and/or voltage has deviated from the other, characterised in which: the electrical circuit comprises a common positive section between the power supply and the pair of positive cables, and a common negative section between the pair of negative cables and the power supply, in which a first modulation means is adapted to generate a modulated communications signal.

Circuit électrique comprenant une alimentation électrique, une charge, une paire de câbles positifs parallèles entre l'alimentation électrique et la charge, une paire de câbles négatifs parallèles entre la charge et l'alimentation électrique, et des moyens de prévention des arcs d'incendie, comprenant : des moyens de surveillance adaptés afin de détecter si le courant et/ou la tension dans l'une des paires de câbles s'éloigne de l'autre, et des moyens de commande adaptés afin d'isoler entièrement ou partiellement l'alimentation électrique de la paire de câbles si les moyens de surveillance détectent que leur courant et/ou leur tension s'est éloigné de l'autre. Le circuit est caractérisé en ce que : le circuit électrique comprend une section positive commune entre l'alimentation électrique et la paire de câbles positifs, et une section négative commune entre la paire de câbles négatifs et l'alimentation électrique, des premiers moyens de modulation étant adaptés afin de générer un signal de communication modulé.

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