Voltage fed programmed start ballast

H - Electricity – 05 – B

Patent

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Details

H05B 41/298 (2006.01)

Patent

CA 2722133

A lighting ballast (10) includes an inverter portion (12) and a resonant portion (14). During a preheat phase, a fila-ment transformer (110) supplies preheat glow currents to lamp cathodes. Also during the preheat phase, the filament transformer boosts the oscillation frequency of the inverter portion (12) to a frequency above a resonant frequency of the resonant portion (14). Once the lamp cathodes are sufficiently heated, the filament transformer (110) is removed from the circuit and the inverter (12) is allowed to start oscillating. A feedback network (150) monitors a high frequency bus (26) and provides input to a shunt regulator (170). The shunt regulator drives the gate of a switch (128) of a bias network (126) and adds or removes the filament transformer (110) to the circuit depending on the conductive state of the switch (128).

Un ballast déclairage (10) comprend une partie convertisseur (12) et une partie de résonance (14). Au cours dune phase de préchauffage, un transformateur de chauffage (110) fournit aux cathodes de la lampe des courants deffluve pour le préchauffage. Egalement pendant la phrase de préchauffage, le transformateur de chauffage augmente la fréquence doscillation de la partie convertisseur (12) jusquà ce quelle dépasse la fréquence de résonance de la partie de résonance (14). Lorsque les cathodes de la lampe sont assez chaudes, ledit transformateur de chauffage (110) est supprimé du circuit, et le convertisseur (12) peut commencer à osciller. Un réseau à réaction (150) surveille un bus haute fréquence (26) et envoie une entrée à un régulateur shunt (170). Celui-ci commande la porte dun commutateur (128) dun réseau de polarisation (126) et ajoute ledit transformateur de chauffage (110) au circuit ou le supprime du circuit, en fonction de létat conducteur du commutateur (128).

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