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:
Aug. 20, 2019
Filed:
Jun. 30, 2016
Schmidhauser Ag, Romanshorn, CH;
Andreas Schrepfer, Wittenbach, CH;
Schmidhauser AG, Romanshorn, CH;
Abstract
A detection of a failure of a phase (as a method and apparatus) in a system—supplied by multiple phases—including a DC link () is suggested. A rectified voltage () of the DC link () pulses at a multiple of the mains frequency as a fundamental wave. The rectified voltage () is filtered for detecting a signal component at the double frequency of the mains frequency (). The rectified voltage () is also 'filtered' for detecting an average link voltage (). A ratio signal () is formed as a ratio of the average link voltage () to the signal component at the double frequency of the mains frequency (). An error detection signal () results from a comparison of the ratio signal () with an error threshold ().