Patents by Inventor Frederick Alan Stich

Frederick Alan Stich 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).

  • Arcless Tap Changer Using Gated Semiconductor Devices
    Publication number: 20170344039
    Abstract: A voltage regulator includes a tap changer coupled to a voltage source terminal and a voltage load terminal, The voltage regulator also includes a first switch and a first current transformer coupled in series between the voltage load terminal and a first movable contact of the tap changer. The voltage regulator further includes a second switch and a second transformer coupled in series between the voltage load terminal and a second movable contact of the tap changer, A first silicon controlled rectifier and a second silicon controlled rectifier are controlled by a first control circuit and a second control circuit, respectively. The first control circuit and the second control circuit each include a rectifier, a gating switch, and a positive voltage detector.
    Type: Application
    Filed: May 27, 2016
    Publication date: November 30, 2017
    Applicant: COOPER TECHNOLOGIES COMPANY
    Inventors: Frederick Alan Stich, Tiefu Zhao