Patents by Inventor William A. Donaldson

William A. Donaldson 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).

  • Publication number: 20050285664
    Abstract: An electromagnetic emission control circuit and method are provided for a power transfer device having a floating bus (214, 215) driven by a power and data system (107, 301, 310, 103). The electromagnetic emission control circuit includes one or more switch control circuits (402, 411) coupled between the floating bus and the power and data system for facilitating charging of the floating bus and for controlling electromagnetic emission from the power transfer device by constraining a slew rate on the floating bus. In one embodiment, the one or more switch control circuits include a first switch control circuit (402) electrically coupled to a high side bus node (214) of the floating bus and a second switch control circuit (411) electrically coupled to a low side bus node (215) of the floating bus. Transfer characteristics of the first and second switch control circuits are tailored to constrain the slew rate on the floating bus.
    Type: Application
    Filed: November 17, 2003
    Publication date: December 29, 2005
    Applicant: Koninklijke Philips Electronics N.V.
    Inventors: William Donaldson, Edmond Toy
  • Publication number: 20040095787
    Abstract: A protection circuit and method are provided for a floating power transfer device having one or more switches for controlling charging of a reservoir capacitor across which a load is applied when in use. The protection circuit includes a control circuit, a fault detection circuit and a precharge driver circuit. The control circuit at least partially controls switching of the at least one switch, while the fault detection circuit detects when a fault in the floating power transfer device or the load occurs and sends a fault detect signal to the control circuit in response thereto. The precharge driver circuit, which is enabled by the control circuit responsive to receipt of the fault detect signal, attempts to precharge the reservoir capacitor to a voltage level sufficient for switching of the one or more switches to proceed without damaging the switches.
    Type: Application
    Filed: June 27, 2003
    Publication date: May 20, 2004
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: William Donaldson, Edmond Toy
  • Publication number: 20040058025
    Abstract: The use of actinidin as a digestive/laxative aid. Method of obtaining actinidin from fruit.
    Type: Application
    Filed: September 20, 2002
    Publication date: March 25, 2004
    Inventor: Bruce William Donaldson
  • Patent number: 6584157
    Abstract: A receiver with an integrated mixer/Sigma-Delta Modulator configuration for digitizing a relatively low-bandwidth signal modulated on a high-frequency carrier, for example in a radio receiver. The Sigma-Delta Modulator has an continuous-time loop filter (F1, F2) with anti-aliasing characteristics which eliminate the need for a separate lowpass filter between the mixer (MX) and the Sigma-Delta Modulator.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: June 24, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Eric J. Van Der Zwan, Eise C. Dijkmans, William Donaldson, Anthony D. Sayers