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:
Apr. 14, 2015
Filed:
Sep. 06, 2012
Frequency converter and method for identifying and blocking a fault current in a frequency converter
Reinhold Dillig, Memmelsdorf, DE;
Bernd Herrmann, Herzogenaurach, DE;
Hubert Schierling, Erlangen, DE;
Benno Weis, Hemhofen, DE;
Reinhold Dillig, Memmelsdorf, DE;
Bernd Herrmann, Herzogenaurach, DE;
Hubert Schierling, Erlangen, DE;
Benno Weis, Hemhofen, DE;
Siemens Aktiengesellschaft, München, DE;
Abstract
In a frequency converter operated for safety of personnel and/or fire protection via a ground fault interrupter is frequently not able to distinguish between an actual fault current and an operationally generated leakage current. The proposed method addresses this problem by determining a course of a magnitude of a current flowing through the frequency converter, predefining a signal portion which is independent of switching processes within the frequency converter while the frequency converter operates fault-free, checking whether the determined course satisfies a criterion that is predetermined depending on the signal portion, and interrupting the current the determined course fails to satisfy the predetermined criterion.