The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 2002
Filed:
Jan. 03, 2001
Mats Karlsson, Huddinge, SE;
Tadeus Wolpert, Bandhagen, SE;
Telefonaktiebolaget L.M. Ericson, Stockholm, SE;
Abstract
An electric supply system comprising two or more phases (R S T ), one rectifier ( ) for each phase, the second primary terminals of said rectifiers ( ) being interconnected, also comprises an Artificial Neutral Point (ANP) creating means (A ) for creating an artificial neutral point (NA ) in the electric supply system, connected in parallel with said rectifiers. The ANP means (A ) short-circuits the zero sequence voltage component of the system but does not affect the positive and negative sequence components. The ANP means (A ) includes magnetic components of such a kind that the vector sum of the phase voltages is zero. According to a first embodiment, the ANP means (A ) comprises one transformer ( ) for each phase, the primary winding of each transformer connected to the respective phase (R S T ) in a star configuration, the secondary windings serially connected and the interconnection point of the primary windings forming an artificial neutral point.