Arrangement for protecting low-voltage control circuitry...

H - Electricity – 02 – H

Patent

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Details

H02H 3/20 (2006.01) H02H 7/00 (2006.01) H02H 9/00 (2006.01) H02H 9/04 (2006.01) H05B 41/285 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2336547

An arrangement for protecting low-voltage control circuitry from externally applied high voltages comprises a voltage source (30) and a current-sourcing circuit (40). Current-sourcing cicuit (40) provides current to an external controller (18) in a normal manner when an external source of high voltage is not applied to the output connections (42, 44), protects itself (40) and the voltage source (30) from damage when an external source of high voltage is applied to the output connections (42,44), and provides current to the external controller (18) in a normal manner after the external source of high voltage is subsequently removed from the output connections (42, 44). The arrangement may be employed as the dimming interface circuit (900) of an electronic dimming ballast (60) for gas discharge lamps to protect ballast circuitry from damage due to wiring errors during installation.

Cette invention concerne un dispositif permettant de protéger un circuit de commande basse tension contre des tensions élevées d'origine extérieure, qui comprend une source de tension (30) et un circuit fournissant du courant (40). Le circuit (40) alimente un organe de commande externe (18) de façon normale tant qu'une tension élevée n'est pas appliquée aux connexions de sortie (42, 44), protège lui-même et la source de tension (40) contre des dégâts provoqués par une tension élevée appliquée aux connexions de sortie (42, 44), et alimente l'organe de commande externe (18) de façon normale une fois que la tension élevée de provenance extérieure n'est plus appliquée aux connexions de sortie (42, 44). Le dispositif selon l'invention peut s'utiliser comme circuit d'interface (900) d'un ballast de gradation électronique (60) sur des lampes de décharge à gaz, en tant que moyen de protection du circuit de ballast contre des erreurs de câblage au montage.

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