Patents by Inventor Keith A. Corzine

Keith A. Corzine 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: 20220149746
    Abstract: A pyramid-type multilevel converter for converting DC voltage to AC voltage waveforms, and vice versa. An example device can use modular building blocks to form a selector stage, a converter stage, and at least one intermediate stage if the number of converters within the converter stage is greater than or equal to 3, with the converter stage switching at high-frequency PWM to chop the DC voltages. The modular building blocks are connected in a symmetric or asymmetric pyramid configuration having a base of using the converter stage and an apex of the selector stage.
    Type: Application
    Filed: January 26, 2022
    Publication date: May 12, 2022
    Applicant: The Regents of the University of California
    Inventors: Vahid Dargahi, Keith A. Corzine
  • Patent number: 11171575
    Abstract: A Modular Multilevel Converter (MMC) circuit for converting DC power to AC and vice versa. At each respective connection to the AC power-source/load, the MMC circuit uses one Pulse Width Modulation Insulated Gate Bipolar Transistor (PWM IGBT) to control the switching between upper and lower arms of sub-modules. The circuit eliminates the inter-phase inductors often used in MMCs, and replaces the inductors by two complementary-gated PWM IGBTs, thereby eliminating circulating current. Moreover, the multilevel converter topology disclosed herein requires less number of components including PWM IGBTs and capacitors. In fact, at least two submodules per-phase are eliminated: one submodule in the upper arm and one submodule in the lower arm. In other words, the MMC topology not only mitigates the circulating current but also eliminates at least one submodule in the upper arm and at least one submodule in the lower arm per-phase.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: November 9, 2021
    Assignee: The Regents of the University of California
    Inventors: Keith Corzine, Vahid Dargahi
  • Patent number: 10998711
    Abstract: An improved DC circuit breaker is provided for automatically detecting and isolating a fault between a source and a ground. The DC circuit breaker comprises at least one switch, in electrical series with a first inductor between the source and a load, and a second inductor magnetically coupled to the first inductor wherein a first side of the second inductor is electrically connected to the load and a second side of the second inductor is grounded through a capacitor.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: May 4, 2021
    Assignee: Clemson University Research Foundation
    Inventor: Keith A. Corzine
  • Publication number: 20200350833
    Abstract: A pyramid-type multilevel converter for converting DC voltage to AC voltage waveforms, and vice versa. An example device can use modular building blocks to form a selector stage, a converter stage, and at least one intermediate stage if the number of converters within the converter stage is greater than or equal to 3, with the converter stage switching at high-frequency PWM to chop the DC voltages. The modular building blocks are connected in a symmetric or asymmetric pyramid configuration having a base of using the converter stage and an apex of the selector stage.
    Type: Application
    Filed: May 1, 2020
    Publication date: November 5, 2020
    Applicant: The Regents of the University of California
    Inventors: Keith A. Corzine, Vahid Dargahi
  • Publication number: 20200336083
    Abstract: A Modular Multilevel Converter (MMC) circuit for converting DC power to AC and vice versa. At each respective connection to the AC power-source/load, the MMC circuit uses one Pulse Width Modulation Insulated Gate Bipolar Transistor (PWM IGBT) to control the switching between upper and lower arms of sub-modules. The circuit eliminates the inter-phase inductors often used in MMCs, and replaces the inductors by two complementary-gated PWM IGBTs, thereby eliminating circulating current. Moreover, the multilevel converter topology disclosed herein requires less number of components including PWM IGBTs and capacitors. In fact, at least two submodules per-phase are eliminated: one submodule in the upper arm and one submodule in the lower arm. In other words, the MMC topology not only mitigates the circulating current but also eliminates at least one submodule in the upper arm and at least one submodule in the lower arm per-phase.
    Type: Application
    Filed: April 22, 2020
    Publication date: October 22, 2020
    Applicant: The Regents of the University of California
    Inventors: Keith A. Corzine, Vahid Dargahi
  • Publication number: 20200266886
    Abstract: An optically-monitored and/or optically-controlled electronic device is described. The device includes at least one of a semiconductor transistor or a semiconductor diode. An optical detector is configured to detect light emitted by the at least one of the semiconductor transistor or the semiconductor diode during operation. A signal processor is configured to communicate with the optical detector to receive information regarding the light detected. The signal processor is further configured to provide information concerning at least one of an electrical current flowing in, a temperature of, or a condition of the at least one of the semiconductor transistor or the semiconductor diode during operation.
    Type: Application
    Filed: February 20, 2020
    Publication date: August 20, 2020
    Applicants: The Regents of the University of California, The Government of the United States of America,as Represented by the Secretary of the Navey
    Inventors: Keith Corzine, Todd Weatherford, Matthew Porter
  • Patent number: 10389104
    Abstract: An improved DC circuit breaker is provided for automatically detecting and isolating a fault between a source and a ground. The DC circuit breaker comprises at least one switch, in electrical series with a first inductor between the source and a load, and a second inductor magnetically coupled to the first inductor wherein a first side of the second inductor is electrically connected to the load and a second side of the second inductor is grounded through a capacitor.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: August 20, 2019
    Assignee: CLEMSON UNIVERSITY
    Inventor: Keith A. Corzine
  • Publication number: 20190190251
    Abstract: An improved DC circuit breaker is provided for automatically detecting and isolating a fault between a source and a ground. The DC circuit breaker comprises at least one switch, in electrical series with a first inductor between the source and a load, and a second inductor magnetically coupled to the first inductor wherein a first side of the second inductor is electrically connected to the load and a second side of the second inductor is grounded through a capacitor.
    Type: Application
    Filed: February 13, 2019
    Publication date: June 20, 2019
    Applicant: Clemson University Research Foundation (CURF)
    Inventor: Keith A. Corzine
  • Patent number: 7746084
    Abstract: An unbalanced line-to-line current is injected at an injected frequency in a three-phase ac circuit. A first set of voltages and currents are obtained. A first set of transformed voltages and transformed currents are produced. The circuit is injected with a second unbalanced line-to-line current at a frequency linearly independent of the injected frequency. A second set of voltages and current are obtained. A second set of transformed voltages and transformed currents are produced The impedance of a source portion and a load portion of the circuit are calculated using the first and second set of transformed voltages, and the first and second set of transformed currents.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: June 29, 2010
    Assignees: Newport News Shipbuilding and Dry Dock Company, The Curators of the University of Missouri
    Inventors: Mohamed Belkhayat, Jing Huang, Keith Corzine
  • Publication number: 20080084219
    Abstract: An unbalanced line-to-line current is injected at an injected frequency in a three-phase ac circuit. A first set of voltages and currents are obtained. A first set of transformed voltages and transformed currents are produced. The circuit is injected with a second unbalanced line-to-line current at a frequency linearly independent of the injected frequency. A second set of voltages and current are obtained. A second set of transformed voltages and transformed currents are produced The impedance of a source portion and a load portion of the circuit are calculated using the first and second set of transformed voltages, and the first and second set of transformed currents.
    Type: Application
    Filed: October 5, 2007
    Publication date: April 10, 2008
    Inventors: Mohamed Belkhayat, Jing Huang, Keith Corzine