Improvements to electronic ballasts

Details Improvements to electronic ballasts Improvements to electronic ballasts

H - Electricity

05

B

H05B 41/288 (2006.01) H05B 41/292 (2006.01)

Patent

CA 2350493

A lighting system (1) having a high intensity discharge lamp (16) and an electronic ballast having a variable frequency generator (10) which is arranged to vary the frequency of the ballast output over a range of frequencies having a minimum frequency of 400 kHz; a reactance is included in a joint operating circuit (22) in and between the ballast generator (10) and lamp (l6) such that the circuit resonate to provide a starting voltage for the lamp at or above the minimum frequency. The arrangement inhibits lamp flickering and improves overall lamp and systems ~

Ce système d'éclairage (1) est pourvu d'une lampe à décharge (16) de grande intensité et d'un circuit de protection électronique possédant un générateur de fréquence variable (10) conçu pour modifier la fréquence de la sortie du circuit de protection au-dessus d'une gamme de fréquences ayant une fréquence minimale de 400 kHz. Un circuit d'exploitation conjoint (22) comporte une réactance dans le générateur de protection (10) et entre celui-ci et la lampe (16), de sorte que le circuit résonne pour fournir une tension de départ à la lampe, égale ou supérieure à la fréquence minimale. Ce dispositif empêche l'oscillation de lampe et permet d'améliorer le rendement de l'ensemble, lampe et système.

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