H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 37/02 (2006.01) G05F 1/00 (2006.01) G08C 19/16 (2006.01) H05B 41/38 (2006.01) H05B 41/392 (2006.01)
Patent
CA 2328270
A line dimmer has a limited maximum firing angle to limit a total harmonic distortion within a powering signal. A dimming ballast generates a pulse width modulated signal based on a firing angle of the powering signal, generates a dimming command signal based on the pulse width modulated signal, and dims a lamp based on the dimming command signal. The maximum firing angle may be limited to 30 degrees, 25 degrees, or 20 degrees, for example, to limit a resulting total harmonic distortion.
Un gradateur de ligne présente un angle d'amorçage maximal limité pour limiter la distorsion harmonique totale du signal d'alimentation. Un ballast de gradation produit un signal à modulation d'impulsions en durée basé sur l'angle d'amorçage du signal d'alimentation, produit un signal de commande de gradation basé sur le signal à modulation d'impulsions en durée et fait varier l'éclairage d'une lampe en fonction du signal de commande de gradation. L'angle d'amorçage maximal peut être par exemple limité 30 degrés, 25 degrés ou 20 degrés pour limiter la distorsion harmonique totale résultante.
Osram Sylvania Inc.
Smart & Biggar
LandOfFree
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