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:
Jan. 28, 2003
Filed:
Aug. 14, 2001
Bilal Gerhard, Niederrohrdorf, CH;
John Daniel, Apex, NC (US);
Madhav Manjrekar, New Berlin, WI (US);
ABB Schweiz AG, Baden, CH;
Abstract
A method is specified for operating a charger ( ) for a voltage-maintaining device ( ), in which a rectifier ( ), connected to phase inputs (P , P ; P ) via a transformer ( ) with an electric AC voltage supply system ( ), of the charger ( ) is driven by means of a drive signal (S) formed from reference charging voltages (U ; U ; U ). Furthermore, a charging voltage (U ; U ; U ) for the corresponding phase (A; B; C) is generated at each phase input (P ; P ; P ) a substantially constant DC voltage (U ) being generated-on the DC voltage side of the rectifier ( ). Each charging voltage (U ; U ; U ) is generated in such a way that in the corresponding phase (A; B; C) a charging current (I ; I ; I ) is injected in a fashion substantially proportional to a phase system voltage (U ; U ; U ) of the corresponding phase (A; B; C) of the electric AC voltage supply system ( ). An apparatus for carrying out the method is also disclosed.