Patents by Inventor Joseph G. Zahnen

Joseph G. Zahnen 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).

  • Low noise sinusoidal controller for pulse width modulated converters
    Patent number: 5642274
    Abstract: A controller for supplying a switching signal to a switched mode power supply, includes a sinusoidal-like wave generator, and circuitry for selectively shifting a dc level in the sinusoidal-like wave whereby a duty cycle of the sinusoidal-like wave at a predetermined threshold level, corresponding to a turn-on level of a power switch in the switched mode power supply, is effectively controlled.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: June 24, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Joseph G. Zahnen, William S. Burdick, Daniel Kustera, Dhaval B. Dalal, Rui Liu, Paulo Caldeira
  • High efficiency d.c. voltage regulator
    Patent number: 4068158
    Abstract: A high efficiency switching regulator for maintaining a constant d.c. voltage is described. An efficiency improvement of better than 20 percent is realized by use of an alternate low impedance current source for supplying base current to the control transistor of a switching regulator.
    Type: Grant
    Filed: July 23, 1976
    Date of Patent: January 10, 1978
    Assignee: The Magnavox Company
    Inventors: James E. Hicks, Joseph G. Zahnen, Werner F. Wedam