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:
Sep. 27, 2011
Filed:
Feb. 14, 2008
Dejan Schreiber, Nümberg, DE;
Dejan Schreiber, Nümberg, DE;
Semikron Elektronik GmbH & Co. KG, Nuremberg, DE;
Abstract
A frequency converter circuit for a double-fed asynchronous generator with a variable power output, which can be connected to a voltage network contains a rotor rectifier, which can be connected to the rotor of the asynchronous generator, a network frequency converter, which can be connected to the voltage network, and an intermediate circuit. The intermediate circuit contains a semiconductor switch arranged on the rotor rectifier, an intermediate circuit capacitor arranged on the network frequency converter, and a diode arranged between the semiconductor switch and the intermediate circuit capacitor. According to a method for operating such a frequency converter circuit, the semiconductor switch is kept closed during the sub-synchronous operation of the asynchronous generator, and during at least some periods of synchronous or super-synchronous operation of the asynchronous generator the semiconductor switch is opened.