Patents by Inventor Stefan Zitzler

Stefan Zitzler 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).

  • Publication number: 20190190407
    Abstract: The invention relates to a soft starter (10) for connecting at least one main circuit (12, 14, 16), each of which includes a bypass circuit (20) having a semiconductor switch (22). Said soft starter (10) comprises a control unit (40) for actuating the bypass circuit (20), and the control unit (40) is equipped with a control signal input (44). According to the invention, the control unit (40) has a separate safety signal input (42).
    Type: Application
    Filed: August 3, 2017
    Publication date: June 20, 2019
    Inventors: Kyoung-Jin Lee-Hoff, Johann Seitz, Klaus Aufschneider, Dirk Hertz, Markus Meier, Stefan Zitzler
  • Patent number: 9851404
    Abstract: An embodiment relates to a switchgear for a single-phase motor and a three-phase motor, the switchgear including a processing unit and a first, second and third current path, the first and third current path each including a current transformer. The processing unit is adapted to detect the current I1 of the first current path and the current I3 of the third current path. To provide a cost-effective switchgear for a one-phase motor and a three-phase motor which is adapted to identify the failure of every single phase in the three-phase operation and a phase failure in the one-phase operation, the processing unit is designed such as to detect the currents I1, I3 of the first and third current path and to determine, based on the phase shift between the detected currents I1, I3 of the first and third current path in which operating mode the switchgear is operated.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: December 26, 2017
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Dirk Hertz, Marco Schönenberg, Helene Steuer, Stefan Zitzler
  • Patent number: 9502881
    Abstract: An embodiment of the invention relates to a switchgear which includes a control unit, a supply connection and a first current path. The first current path includes a first electromechanical switch and, connected in series to the first switch, a parallel connection of a second electromechanical switch to a semiconductor switch. The switchgear includes an energy accumulator and a measuring device. A control unit is capable of monitoring energy supply coming in through the supply connection. If the energy supply through the supply connection reaches a critical range, the control unit controls the output of the switching signals via the energy of the energy accumulator such that: in a first step, the semiconductor switch is switched to be electrically conducting and the second switch is then opened, and in a second step, the semiconductor switch is switched to be electrically non-conducting and the second switch is then opened.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: November 22, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Dirk Hertz, Marco Schönenberg, Johann Seitz, Stefan Zitzler
  • Publication number: 20150303676
    Abstract: An embodiment of the invention relates to a switchgear which includes a control unit, a supply connection and a first current path. The first current path includes a first electromechanical switch and, connected in series to the first switch, a parallel connection of a second electromechanical switch to a semiconductor switch. The switchgear includes an energy accumulator and a measuring device. A control unit is capable of monitoring energy supply coming in through the supply connection. If the energy supply through the supply connection reaches a critical range, the control unit controls the output of the switching signals via the energy of the energy accumulator such that: in a first step, the semiconductor switch is switched to be electrically conducting and the second switch is then opened, and in a second step, the semiconductor switch is switched to be electrically non-conducting and the second switch is then opened.
    Type: Application
    Filed: August 30, 2012
    Publication date: October 22, 2015
    Applicant: Siemens Aktiengesellschaft
    Inventors: Dirk HERTZ, Marco SCHÖNENBERG, Johann SEITZ, Stefan ZITZLER
  • Publication number: 20150241514
    Abstract: An embodiment relates to a switchgear for a single-phase motor and a three-phase motor, the switchgear including a processing unit and a first, second and third current path, the first and third current path each including a current transformer, The processing unit is adapted to detect the current I1. of the first current path and the current I3 of the third current path. To provide a cost-effective switchgear for a one-phase motor and a three-phase motor which is adapted to identify the failure of every single phase in the three-phase operation and a phase failure in the one-phase operation, the processing unit is designed such as to detect the currents I1, I3 of the first and third current path and to determine, based on the phase shift between the detected currents I1, I3 of the first and third current path in which operating mode the switchgear is operated.
    Type: Application
    Filed: August 20, 2013
    Publication date: August 27, 2015
    Inventors: Dirk Hertz, Marco Schönenberg, Helene Steuer, Stefan Zitzler
  • Patent number: 8736205
    Abstract: A switching device and method are disclosed for terminating a braking process of a three-phase AC motor. The braking process of the AC motor is performed by way of a first and second thyristor. During the braking process of the AC motor, in a first step the first thyristor is actuated in such a way that a braking current is fed to the AC motor, and therefore a torque which brakes the AC motor is produced. In a second step the second thyristor is actuated in such a way that, when the first thyristor is quenched, the braking current is taken on by the second thyristor and the braking torque is maintained. The two steps are repeated during the braking process; wherein the second step is suppressed during the braking process after a last actuation of the first thyristor.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: May 27, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dirk Hertz, Johann Seitz, Stefan Zitzler
  • Patent number: 8698439
    Abstract: A method is disclosed for determining a phase failure in an electrical device for driving or monitoring a three-phase AC motor, wherein the electrical device comprises a first, a second and a third line. In order to detect a phase failure in a line in the three-phase electrical device, in particular in a soft starter, the phase failure in the third line is determined by analysing the first and second lines, wherein the analysis includes: determining a value which characterizes a phase shift between a current in the first and second lines, and outputting a signal if the value which has been determined is in a range of values which characterizes a phase failure in the third line.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: April 15, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dirk Hertz, Marco Schönenberg, Johann Seitz, Stefan Zitzler
  • Publication number: 20130241450
    Abstract: A switching device and method are disclosed for terminating a braking process of a three-phase AC motor. The braking process of the AC motor is performed by way of a first and second thyristor. During the braking process of the AC motor, in a first step the first thyristor is actuated in such a way that a braking current is fed to the AC motor, and therefore a torque which brakes the AC motor is produced. In a second step the second thyristor is actuated in such a way that, when the first thyristor is quenched, the braking current is taken on by the second thyristor and the braking torque is maintained. The two steps are repeated during the braking process; wherein the second step is suppressed during the braking process after a last actuation of the first thyristor.
    Type: Application
    Filed: November 17, 2010
    Publication date: September 19, 2013
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Dirk Hertz, Johann Seitz, Stefan Zitzler
  • Publication number: 20130221892
    Abstract: A method is disclosed for determining a phase failure in an electrical device for driving or monitoring a three-phase AC motor, wherein the electrical device comprises a first, a second and a third line. In order to detect a phase failure in a line in the three-phase electrical device, in particular in a soft starter, the phase failure in the third line is determined by analysing the first and second lines, wherein the analysis includes: determining a value which characterizes a phase shift between a current in the first and second lines, and outputting a signal if the value which has been determined is in a range of values which characterizes a phase failure in the third line.
    Type: Application
    Filed: November 17, 2010
    Publication date: August 29, 2013
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Dirk Hertz, Marco Schönenberg, Johann Seitz, Stefan Zitzler
  • Patent number: 8466640
    Abstract: A method is disclosed for slowing-down control of an asynchronous machine, wherein the value of a start energy is determined and stored while the asynchronous machine is being run up from being stationary to the operating rotation speed. The asynchronous machine is braked, in the reversing mode, with braking energy which corresponds to the start energy multiplied by a correction factor wherein the correction factor assumes a value between 0 and 1. In at least one embodiment, the asynchronous machine is braked further by DC braking after braking has been carried out in the reversing mode.
    Type: Grant
    Filed: August 12, 2008
    Date of Patent: June 18, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dirk Hertz, Diethard Runggaldier, Stefan Zitzler
  • Publication number: 20100207554
    Abstract: A method is disclosed for slowing-down control of an asynchronous machine, wherein the value of a start energy is determined and stored while the asynchronous machine is being run up from being stationary to the operating rotation speed. The asynchronous machine is braked, in the reversing mode, with braking energy which corresponds to the start energy multiplied by a correction factor wherein the correction factor assumes a value between 0 and 1. In at least one embodiment, the asynchronous machine is braked further by DC braking after braking has been carried out in the reversing mode.
    Type: Application
    Filed: August 12, 2008
    Publication date: August 19, 2010
    Inventors: Dirk Hertz, Diethard Runggaldier, Stefan Zitzler