Ballast filtering scheme for reduced harmonic distortion

H - Electricity – 02 – J

Patent

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Details

H02J 3/00 (2006.01) H05B 41/16 (2006.01) H05B 41/28 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2178953

A ballast filter scheme in which the ballast can operate at a total harmonic distortion of power line current of less than 10 %. Power dissipated by the filter when at a THD of less than 10 % is relatively low. The input impedance of the ballast is designed to be no greater than twice the equivalent filter impedance of a front end filter and no less than the equivalent filter impedance/1.5. The filter includes a transformer having a core which at times operates within the non-linear region of its B-H curve under nominally rated ballast load conditions.

Dans un schéma de filtrage à ballast, le ballast peut fonctionner à une distorsion harmonique totale du courant dans la ligne de force inférieure à 10 %. La puissance dissipée par le filtre lorsque la distorsion harmonique totale est inférieure à 10 % est relativement faible. L'impédance d'entrée du ballast n'est pas supérieure au double de l'impédance équivalente d'un filtre d'entrée et n'est pas inférieure à 1,5 de l'impédance équivalente du filtre. Le filtre comprend un transformateur avec un noyau qui fonctionne de temps en temps à l'intérieur de la zone non linéaire de sa courbe d'aimantation dans des conditions où la charge du ballast a une puissance nominale.

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