Patents by Inventor Johannus Emmanuel Maria Lammers

Johannus Emmanuel Maria Lammers 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).

  • DC/DC conversion circuit having a switching frequency proportional to power output
    Patent number: 6483725
    Abstract: DC/DC conversion circuit (1), includes a transformer (2) having a primary winding (3), a secondary winding (4), and an auxiliary winding (5); a switching transistor (T), including a series circuit with the primary winding (3) between first and second direct current input terminals (6; 7); a start circuit (R1, C1) connected to a control electrode of the switching transistor (T) for switching the switching transistor (T) on by powering the direct current input terminals (6; 7); a control transistor connected to the control electrode of the switching transistor (T) for switching off the switching transistor (T) in dependence on a current flowing through the series circuit during operation.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: November 19, 2002
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Cornelis Johannes Adrianus Schetters, Johannus Emmanuel Maria Lammers, Tijmen Cornelis Van Bodegraven