Patents by Inventor Susan R. Schen

Susan R. Schen 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).

  • Power supply with continuous spread-spectrum switching signal
    Patent number: 9350232
    Abstract: A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: May 24, 2016
    Assignee: Apple Inc.
    Inventors: Yongxuan Hu, Keong W. Kam, Shimon Elkayam, Susan R. Schen
  • POWER SUPPLY WITH CONTINUOUS SPREAD-SPECTRUM SWITCHING SIGNAL
    Publication number: 20140268900
    Abstract: A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI.
    Type: Application
    Filed: April 1, 2013
    Publication date: September 18, 2014
    Applicant: Apple Inc.
    Inventors: Yongxuan Hu, Keong W. Kam, Shimon Elkayam, Susan R. Schen