Patents by Inventor Heiko Kaufmann

Heiko Kaufmann 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).

  • Converter circuit for generating direct current with selectable polarity
    Patent number: 5596490
    Abstract: A two- or three-phase input transformer (1) feeds a conventional six-diode full-wave bridge rectifier (3) whose output terminals (4, 5) are connected through capacitors (6, 7) to the star point (2) of the second side (1b) of the transformer, and through controlled switches (9, 10) to a midpoint (8). A DC motor (11) connected between the star point and midpoint is coupled to a tachogenerator (12) which supplies a signal to the control circuit (13) operating the controlled switches, which preferably are modified MOSFETs with temperature-compensated reference voltage.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: January 21, 1997
    Assignee: Antelec Engineering GmbH
    Inventor: Heiko Kaufmann