Ballast instant start circuit

H - Electricity – 05 – B

Patent

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Details

IPC codes

H05B 41/282 (2006.01)

Type

Patent

Patent number

CA 2328860

Description

An electronic circuit providing independent operation and application of instant start voltages to each of a plurality of lamps. In a first embodiment, a circuit includes inductively coupled first and second inductive elements disposed on a single bobbin. A capacitive element is coupled between the first and second inductive elements to allow the inductively coupled inductive elements to operate independently when a lamp is removed from the circuit. A steady state strike voltage is generated at the lamp terminals from which a lamp has been removed. In another embodiment, a circuit includes a first circuit path including a first inductive element coupled to a first lamp and a second circuit including a second inductive element coupled to a second lamp. The first and second inductive elements are inductively coupled to effectively cancel flux generated while the first and second lamps are energized. When one of the lamps is removed, flux is no longer canceled so that a strike voltage is generated at the lamp terminals from which the lamp was removed.

L'invention concerne un circuit électronique permettant l'exploitation et l'application indépendantes de tensions de démarrage instantanées sur chaque lampe d'une pluralité de lampes. Dans un premier mode de réalisation, un circuit comporte des premier et second éléments couplés par induction, placés sur une seule bobine. Un élément capacitif est couplé entre les premier et second éléments inductifs afin de permettre le fonctionnement indépendant desdits éléments lorsqu'une lampe est retirée du circuit. Une tension disruptive en régime permanent est générée au niveau des bornes de lampe desquelles la lampe a été enlevée. Dans un autre mode de réalisation, un circuit comporte un premier chemin de circuit comprenant un premier élément inductif couplé à une première lampe et un second circuit comprenant un second élément inductif couplé à une seconde lampe. Les premier et second éléments inductifs sont couplés de manière inductive, de sorte qu'ils suppriment efficacement le flux généré alors que les première et seconde lampes sont excitées. Lorsqu'une des lampes est enlevée, le flux n'est plus supprimé, de sorte qu'une tension disruptive soit générée au niveau des bornes de lampe desquelles la lampe a été enlevée.

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