Ballast for at least one gas discharge lamp, and a method...

H - Electricity – 05 – B

Patent

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Details

H05B 41/298 (2006.01) H05B 41/282 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2337062

The present invention relates to a ballast for at least one gas discharge lamp (26). Said ballast comprises an inverter that is fed by a direct current source (C0). The inverter is provided with a bridge circuit with a first and a second controllable switch (T1, T2). The bridge circuit is arranged parallel in relation to the direct current source (C0). The bridge centre is connected to a load circuit (14) which comprises the at least one gas discharge lamp (26). Each gas discharge lamp (26) is provided with a first and a second electrode (28, 30). The ballast also comprises a control circuit (16) by means of which the pulse duty factor of the first and second switch (T1, T2) can be influenced. The pulse duty factor is unequal 50 % and can be controlled by means of the control circuit in such a way that the first and second electrode are thermally charged in an essentially equal manner on average. The invention further relates to a corresponding method for operating a ballast for at least one gas discharge lamp.

L'invention concerne un ballast pour au moins une lampe à décharge (26), comprenant un convertisseur alimenté par une source de tension continue (C0) présentant un circuit en pont avec un premier et un deuxième interrupteurs réglables (T1, T2), monté en parallèle avec ladite source de tension continue (C0), le centre du pont étant connecté à un circuit de charge (14) comprenant au moins une lampe à décharge (26), chaque lampe à décharge (26) présentant une première et une deuxième électrodes (28, 30), et un circuit de commande (16) influençant le taux d'impulsions du premier et du deuxième interrupteurs (T1, T2), ce taux d'impulsions étant différent de 50 %. L'invention est caractérisée en ce que le taux d'impulsions est réglable au moyen du circuit de commande, de telle façon que la première et la deuxième électrodes soient, en moyenne, thermiquement chargées de façon sensiblement égale. L'invention concerne en outre un procédé correspondant pour faire fonctionner un ballast pour au moins une lampe à décharge.

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