High intensity discharge lamp control

H - Electricity – 05 – B

Patent

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Details

H05B 41/36 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2525067

A controller (5) for a high intensity discharge lamp (4) includes a primary ballast for providing a primary current to the lamp (4), and a current injector which in the case shown comprises a control ballast (8) and a switch (9) (e.g. a triac) controlled by a control unit (12). The current injector injects a secondary current into the lamp (4) that is less than the primary current and can be varied by the control unit (12), e.g. by varying the amount of time within an a.c. cycle that the control ballast (8) is switched into the circuit. The controller (5) allows the lamp (4) to be controlled, for example, to operate at a constant power (variable light output) or at a constant light output (variable power).

L'invention porte sur un régulateur (5) de lampe à décharge (4) de forte intensité comportant un ballast primaire fournissant un premier courant à la lampe (4) et un injecteur de courant qui, dans le cas présenté, comprend un ballast régulateur (8) et un commutateur (9) (par exemple un triac) commandé par une unité de commande (12). Ledit injecteur injecte dans la lampe (4) un courant secondaire inférieur au courant primaire et qui peut être modifié par l'unité de commande (12), par exemple en faisant varier le temps d'une période du courant alternatif pendant lequel le ballast régulateur (8) est raccordé au circuit. Le régulateur (5) agit sur la lampe (4) lui permettant par exemple de fonctionner à puissance constante (mais intensité lumineuse variable), ou à intensité lumineuse constante (mais à puissance variable).

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