Ballast with lamp-to-earth-ground fault protection circuit

Details Ballast with lamp-to-earth-ground fault protection circuit Ballast with lamp-to-earth-ground fault protection circuit

H - Electricity

05

B

H05B 41/14 (2006.01) H02H 7/00 (2006.01) H05B 41/285 (2006.01) H05B 41/298 (2006.01) H05B 41/46 (2006.01)

Patent

CA 2429430

A ballast includes an inverter and a protection circuit that prevents excessive lamp-to-earth-ground fault current. The protection circuit includes a transformer and an inverter disable circuit. The transformer measures a first current going out of one set of ballast output terminals and a second current going into another set of ballast output terminals. In response to a substantial imbalance between the first current and the second current, inverter disable circuit terminates inverter switching. Preferably, protection circuit further includes a restart timer circuit that, following termination of inverter switching in response to a fault condition, prevents the inverter from restarting for a predetermined delay period.

Un ballast comprend un onduleur et un circuit de protection qui empêche l'entrée d'un courant excessif de défaut de mise à la terre entre une lampe et la terre. Le circuit de protection comprend un transformateur et un circuit de coupure d'onduleur. Le transformateur mesure un premier courant sortant d'un jeu de bornes de sortie du ballast et un second courant appliqué à un autre jeu de bornes de sortie. En réaction à un déséquilibre important entre le premier et le second courants, le circuit de coupure de l'onduleur met fin au découpage de l'onduleur. De préférence, le circuit de protection comprend de plus un circuit de temporisateur de redémarrage qui, après l'interruption du découpage de l'onduleur, en réponse à une condition de défaut, empêche l'onduleur de redémarrer pendant une période de retard prédéterminée.

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