Patents by Inventor Ulrich Wenkemann

Ulrich Wenkemann 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).

  • Patent number: 8453814
    Abstract: A motor drive circuit for a rail vehicle has a step-up converter, which is disposed at the input of the motor drive circuit, and which converts a mains DC voltage, at the input of the motor drive circuit into an intermediate circuit DC voltage. A pulse rectifier, which is downstream from the step-up converter, can be connected at the output to a drive motor of the rail vehicle and it is capable of converting the intermediate circuit DC voltage of the step-up converter into a motor drive voltage for driving the drive motor. A control unit activates the step-up converter in operation such that the converter generates the predetermined rated intermediate circuit DC voltage for a mains DC voltage below a predetermined rated intermediate circuit DC voltage as the intermediate circuit DC voltage.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: June 4, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Herbert Gambach, Martin Glinka, Ulrich Wenkemann
  • Publication number: 20110011300
    Abstract: A motor drive circuit for a rail vehicle has a step-up converter, which is disposed at the input of the motor drive circuit, and which converts a mains DC voltage, at the input of the motor drive circuit into an intermediate circuit DC voltage. A pulse rectifier, which is downstream from the step-up converter, can be connected at the output to a drive motor of the rail vehicle and it is capable of converting the intermediate circuit DC voltage of the step-up converter into a motor drive voltage for driving the drive motor. A control unit activates the step-up converter in operation such that the converter generates the predetermined rated intermediate circuit DC voltage for a mains DC voltage below a predetermined rated intermediate circuit DC voltage as the intermediate circuit DC voltage.
    Type: Application
    Filed: March 2, 2009
    Publication date: January 20, 2011
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Herbert Gambach, Martin Glinka, Ulrich Wenkemann