Patents by Inventor Andreas Schrepfer

Andreas Schrepfer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Detecting a failure of a phase in a grid for inverters having a frequency detection in an intermediate DC voltage link
    Patent number: 10386426
    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 (5) is suggested. A rectified voltage (10) of the DC link (5) pulses at a multiple of the mains frequency as a fundamental wave. The rectified voltage (10) is filtered for detecting a signal component at the double frequency of the mains frequency (12). The rectified voltage (10) is also “filtered” for detecting an average link voltage (14). A ratio signal (17) is formed as a ratio of the average link voltage (14) to the signal component at the double frequency of the mains frequency (12). An error detection signal (19) results from a comparison of the ratio signal (17) with an error threshold (20).
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: August 20, 2019
    Assignee: Schmidhauser AG
    Inventor: Andreas Schrepfer
  • DETECTING A FAILURE OF A PHASE IN A GRID FOR INVERTERS HAVING A FREQUENCY DETECTION IN AN INTERMEDIATE DC VOLTAGE LINK
    Publication number: 20170234936
    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 (5) is suggested. A rectified voltage (10) of the DC link (5) pulses at a multiple of the mains frequency as a fundamental wave. The rectified voltage (10) is filtered for detecting a signal component at the double frequency of the mains frequency (12). The rectified voltage (10) is also “filtered” for detecting an average link voltage (14). A ratio signal (17) is formed as a ratio of the average link voltage (14) to the signal component at the double frequency of the mains frequency (12). An error detection signal (19) results from a comparison of the ratio signal (17) with an error threshold (20).
    Type: Application
    Filed: June 30, 2016
    Publication date: August 17, 2017
    Inventor: Andreas Schrepfer