Patents by Inventor Werner Gratzke

Werner Gratzke 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).

  • Circuit arrangement for an inverter
    Patent number: 4019117
    Abstract: In an inverter bridge having a recovery diode bridge associated therewith with the junction points in the inverter bridge coupled to corresponding junctions of the recovery diode bridge the d.c. inputs of the inverter are connected by means of symmetrically arranged electronic switches to the two d.c. supply voltage potentials with the recovery diode bridge connected to the d.c. supply ahead of the electronic switches. Also shown are auxiliary circuits including a capacitor, inductance and resistance associated with the electronic switches which permit elimination of the protective circuit components usually associated with the inverter semiconductors and recovery diodes.
    Type: Grant
    Filed: September 3, 1975
    Date of Patent: April 19, 1977
    Assignee: Siemens Aktiengesellschaft
    Inventors: Horst Gehm, Werner Gratzke, Wilhelm Linden