Patents by Inventor David Bruce Smyth

David Bruce Smyth 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).

  • Audio band conducted emissions suppression on power feeders
    Patent number: 6643148
    Abstract: A switch-mode power converter that powers the fan or blower unit in a communication system is used to suppress the audio band noise, thereby eliminating any need for additional passive or active filters used in the prior art. The frequency response of a switch-mode DC/DC converter is set by a control loop. By modifying the feedback amplifier compensation network in the control loop such that the frequency control loop bandwidth of the converter is substantially less than the AC load of the fans or blowers, the invention eliminates the need for additional filtering beyond that inherent in the power converter.
    Type: Grant
    Filed: April 18, 2002
    Date of Patent: November 4, 2003
    Assignee: Alcatel Canada Inc.
    Inventor: David Bruce Smyth
  • AUDIO BAND CONDUCTED EMISSIONS SUPPRESSION ON POWER FEEDERS
    Publication number: 20030198063
    Abstract: A switch-mode power converter that powers the fan or blower unit in a communication system is used to suppress the audio band noise, thereby eliminating any need for additional passive or active filters used in the prior art. The frequency response of a switch-mode DC/DC converter is set by a control loop. By modifying the feedback amplifier compensation network in the control loop such that the frequency control loop bandwidth of the converter is substantially less than the AC load of the fans or blowers, the invention eliminates the need for additional filtering beyond that inherent in the power converter.
    Type: Application
    Filed: April 18, 2002
    Publication date: October 23, 2003
    Inventor: David Bruce Smyth