Patents by Inventor Donald M. Silva

Donald M. Silva 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 switching power supply having variable reluctance transformer
    Patent number: 4994952
    Abstract: There is provided a low-noise switching power supply for producing a regulated output voltage from an unregulated supply. The power supply includes a main transformer having first, second and third legs. A primary winding associated with a first leg produces an alternating magnetic flux in the core. A load winding associated with a second leg produces the output voltage from the power supply. A control winding is associated with the third leg. The regulated output voltage is compared to a reference voltage and used to operate a control circuit which alternately short circuits the control winding so as to vary the reluctance pass in the transformer and maintain the output voltage at a substantially constant predetermined value. A feedback circuit including a coupling transformer connects the primary coil to the switching circuit to improve regulation and provide a "soft start" capability.
    Type: Grant
    Filed: September 20, 1989
    Date of Patent: February 19, 1991
    Assignee: Electronics Research Group, Inc.
    Inventors: Donald M. Silva, LeRoy F. Silva, Fred M. Fehsenfeld, Sr.
  • Low-noise switching power supply having variable reluctance transformer
    Patent number: 4876638
    Abstract: There is provided a low-noise switching power supply for producing a regulated output voltage from an unregulated supply. The power supply includes a main transformer having first, second and third legs. A primary winding associated with a first leg produces an alternating magnetic flux in the core. A load winding associated with a second leg produces the output voltage from the power supply. A control winding is associated with the third leg. The regulated output voltage is compared to a reference voltage and used to operate a control circuit which alternately short circuits the control winding so as to vary the reluctance pass in the transformer and maintain the output voltage at a substantially constant predetermined value. A feedback circuit including a coupling transformer connects the primary coil to the switching circuit to improve regulation and provide a "soft start" capability.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: October 24, 1989
    Assignee: Electronic Research Group, Inc.
    Inventors: Donald M. Silva, Leroy F. Silva, Fred M. Fehsenfeld, Sr.