Patents by Inventor Joe Michael Leisten

Joe Michael Leisten 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).

  • Noise reduction systems and methods for unshielded coupling of switch mode power supply
    Patent number: 8023294
    Abstract: We describe a switch mode power supply having a power input, a switch, a transformer, and a power output. The transformer has a primary winding coupled to said power input via said switch, and a secondary winding coupled to said power output. The transformer further comprises an auxiliary winding and a coupling structure capacitatively coupled to said secondary winding of said transformer; wherein said coupling structure does not comprise a shield or screen between said primary and secondary windings. The switch mode power supply further comprises a coupling capacitor connected between said coupling structure and said auxiliary winding to provide a noise suppression voltage from said auxiliary winding to said secondary winding to at least partially cancel a common mode noise voltage on said secondary winding from unshielded coupling from said primary winding.
    Type: Grant
    Filed: July 22, 2008
    Date of Patent: September 20, 2011
    Assignee: Cambridge Semiconductor Limited
    Inventors: Paul Ryan, Joe Michael Leisten
  • NOISE REDUCTION SYSTEMS AND METHODS
    Publication number: 20090212754
    Abstract: We describe a switch mode power supply having a power input, a switch, a transformer, and a power output. The transformer has a primary winding coupled to said power input via said switch, and a secondary winding coupled to said power output. The transformer further comprises an auxiliary winding and a coupling structure capacitatively coupled to said secondary winding of said transformer; wherein said coupling structure does not comprise a shield or screen between said primary and secondary windings. The switch mode power supply further comprises a coupling capacitor connected between said coupling structure and said auxiliary winding to provide a noise suppression voltage from said auxiliary winding to said secondary winding to at least partially cancel a common mode noise voltage on said secondary winding from unshielded coupling from said primary winding.
    Type: Application
    Filed: July 22, 2008
    Publication date: August 27, 2009
    Applicant: Cambridge Semiconductor Limited
    Inventors: Paul Ryan, Joe Michael Leisten