H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 3/26 (2006.01) H02M 7/02 (2006.01) H02M 7/66 (2006.01)
Patent
CA 2331710
An apparatus for reducing the current in the neutral conductor of an electrical two- or three-phase system comprises: means (21, 22, 23) for measuring the voltage or current of each phase; means (35) for measuring the current in the neutral conductor; multiplying means (31, 32, 33) for multiplying the phase voltage or current of each phase by the current in the neutral conductor; means (42) for feeding back the product of the phase voltage and the current to the load in a negative feedback loop. Said apparatus may also comprise: interface means (21, 22, 23) for converting the measured phase voltages or currents and the neutral current into control signals; and means (107, 109) for normalizing the output of said multiplying means by low-pass filtering. A method for reducing the neutral current is also disclosed.
L'invention concerne un appareil permettant de réduire le courant dans le conducteur neutre d'un système biphasé ou triphasé, lequel appareil comprend : des moyens (21, 22, 23) de mesure de la tension ou du courant de chaque phase, des moyens (35) de mesure du courant dans le conducteur neutre, des moyens de multiplication (31, 32, 33) permettant de multiplier la tension ou le courant de phase de chaque phase par le courant circulant dans le conducteur neutre, des moyens (42) permettant de réintroduire le produit de la tension de phase et du courant dans la charge d'une boucle de rétroaction négative. Ledit appareil peut comprendre également : des moyens (21, 22, 23) permettant de convertir les tensions ou les courants de phase mesurés et le courant de neutre en des signaux de commande, et des moyens (107, 109) permettant de pondérer le signal de sortie des moyens de multiplication par filtrage passe-bas. L'invention concerne également un procédé permettant de réduire le courant de neutre.
Karlsson Mats
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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