Device for operating a discharge lamp

Details Device for operating a discharge lamp Device for operating a discharge lamp

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/24 (2006.01) H05B 41/28 (2006.01)

Patent

CA 2215599

The invention relates to a device for operating a fluores- cent discharge lamp of the outer electrode type. As claimed in the invention a switching device is turned on and off by driver signals with a stipulated frequency, by which on the secondary side of a transformer the periodic voltage wave- form shown at A in Figure 1 is produced. This voltage wave- form is applied to the fluorescent discharge lamp of the outer electrode type, and thus operation is effected. For the above described periodic voltage waveform, with respect to repetition period t 2 W o < t, if the width at a vol- tage of the waveform of 0 V which has a single maximum peak value within one period is labelled W o, its full width at half maximum (the width between a and b in Figure 1) being set to a stipulated value (for example, to a value of less than or equal to 2.5 µsec). This makes it possible to maintain stable emission even if the pressure of the gas filled in the discharge lamp is increased. In this way high illumination intensity can be obtained.

Cette invention concerne un dispositif d'éclairage destiné à une lampe à décharge fluorescente du type ayant une électrode externe. Un élément de commutation (8) est ouvert et fermé par un signal de commande, de fréquence préétablie, de telle sorte que l'onde de tension cyclique est produite du côté secondaire d'un transformateur (9). Cette onde de tension est appliquée à une lampe à décharge (1) fluorescente du type ayant une électrode externe, et provoque de ce fait l'éclairage de la lampe à décharge (1) fluorescente. Dans cette onde de tension cyclique, la largeur de niveau zéro (W0) d'une onde ayant la tension de crête maximum en une période, est fixée à 2W0 <t relativement à la période du cycle (t), et la demi-largeur (W) (la largeur entre "a" et "b" est fixée à une valeur préétablie (par exemple, 2,5 mu sec ou moins). Ainsi, même si la pression du gaz enfermé dans la lampe à décharge fluorescente (1) augmente, il est possible de maintenir la stabilité de la décharge et donc d'obtenir une luminance élevée.

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