Patents by Inventor Shojiro Kato

Shojiro Kato 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).

  • Patent number: 12181946
    Abstract: An abnormality detection circuit includes: a first current source configured to generate a first current flowing from an external terminal toward a reference potential terminal; a second current source configured to generate a second current flowing from a power supply potential terminal toward the external terminal; a comparator configured to generate an abnormality detection signal by comparing a detection voltage corresponding to an application voltage of the external terminal with a predetermined threshold voltage; and a controller configured to switch between a first abnormality detection mode in which an operation of generating the first current is performed and a second abnormality detection mode in which an operation of generating the second current is performed.
    Type: Grant
    Filed: January 4, 2023
    Date of Patent: December 31, 2024
    Assignee: Rohm Co., Ltd.
    Inventors: Keita Okamoto, Shojiro Kato
  • Publication number: 20240421203
    Abstract: A semiconductor device includes an insulated gate type first transistor that is formed at a semiconductor chip, an insulated gate type second transistor that is formed at the semiconductor chip, and a control wiring that transmits a control signal controlling the first transistor and the second transistor to reach an ON state during a normal operation and controlling the first transistor to reach an OFF state and the second transistor to reach an ON state during an active clamp operation.
    Type: Application
    Filed: August 30, 2024
    Publication date: December 19, 2024
    Applicant: ROHM CO., LTD.
    Inventors: Shojiro KATO, Keita OKAMOTO, Shuntaro TAKAHASHI
  • Publication number: 20230266810
    Abstract: An abnormality detection circuit includes: a first current source configured to generate a first current flowing from an external terminal toward a reference potential terminal; a second current source configured to generate a second current flowing from a power supply potential terminal toward the external terminal; a comparator configured to generate an abnormality detection signal by comparing a detection voltage corresponding to an application voltage of the external terminal with a predetermined threshold voltage; and a controller configured to switch between a first abnormality detection mode in which an operation of generating the first current is performed and a second abnormality detection mode in which an operation of generating the second current is performed.
    Type: Application
    Filed: January 4, 2023
    Publication date: August 24, 2023
    Inventors: Keita Okamoto, Shojiro Kato