Ballast circuit

Details Ballast circuit Ballast circuit

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/282 (2006.01)

Patent

CA 2196573

An electronic ballast for powering at least two rapid start, parallel connected fluorescent lamps. Associated with each lamp is a serially connected choke and capacitor combination. A train of pulses of alternating polarity having a fundamental frequency, which is generated by an inverter, is applied to each serially connected combination. Each combination is characterized by a resonant frequency which is other than an odd harmonic of and at least two times the fundamental frequency. Reduction in filament heating, following lamp ignition, is provided through the addition of voltages applied to each filament which are substantially out of phase with each other.

L'invention porte sur un ballast électronique servant à alimenter au moins deux lampes fluorescentes à démarrage rapide montées en parallèle et à chacune desquelles est raccordée en série une combinaison R/C. Un train d'impulsions de polarités alternées présentant une fréquence fondamentale produite par un onduleur est appliqué à chacune desdites combinaisons. Chacune de ces combinaisons est caractérisée par sa fréquence de résonance qui est différente d'harmonique impair d'au moins deux fois la fréquence fondamentale. Le moindre échauffement du filament faisant suite à l'allumage résulte de l'addition des tensions appliquées à chacun des filaments, qui se trouvent sensiblement déphasées les unes par rapport aux autres.

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