Patents by Inventor Takenori Yasuzumi

Takenori Yasuzumi 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: 20230299767
    Abstract: According to one embodiment, a semiconductor device includes an n-layer and a p-layer arranged in a vertical trench structure in a drift layer. A depletion layer is formed to a depth of a trench of the vertical trench structure after a depletion layer spreads in a lateral direction between the n-layer and the p-layer when a voltage is applied between a drain and a source. A method for controlling the semiconductor device comprises detecting a voltage value between the drain and the source of the semiconductor device at turn-off and reducing a current value of a gate discharge current discharged from a gate in a first period. The first period starting before the detected voltage value greatly changes.
    Type: Application
    Filed: February 13, 2023
    Publication date: September 21, 2023
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Takenori YASUZUMI, Kohei HASEGAWA, Tsuguhiro TANAKA, Shusuke KAWAI
  • Patent number: 11462525
    Abstract: An optical coupling device includes a light receiving element provided with a first output terminal and a second output terminal, a light emitting element provided on the light receiving element, a first switching element, a first electrode plate, and a sealing member. The first switching element is provided side by side on the light receiving element. A first main terminal and a control terminal are provided on an upper surface of the first switching element. A second main terminal is provided on a lower surface of the first switching element. The first main terminal is connected to the first output terminal. The control terminal is connected to the second output terminal. An upper surface of the first electrode plate is connected to the second main terminal. The sealing member covers the light receiving element, the light emitting element, and the first switching element.
    Type: Grant
    Filed: September 8, 2020
    Date of Patent: October 4, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Mami Fujihara, Naoya Takai, Kazuki Tanaka, Takenori Yasuzumi, Yoshio Noguchi, Tsuyoshi Tokiwa
  • Publication number: 20210249391
    Abstract: An optical coupling device includes a light receiving element provided with a first output terminal and a second output terminal, a light emitting element provided on the light receiving element, a first switching element, a first electrode plate, and a sealing member. The first switching element is provided side by side on the light receiving element. A first main terminal and a control terminal are provided on an upper surface of the first switching element. A second main terminal is provided on a lower surface of the first switching element. The first main terminal is connected to the first output terminal. The control terminal is connected to the second output terminal. An upper surface of the first electrode plate is connected to the second main terminal. The sealing member covers the light receiving element, the light emitting element, and the first switching element.
    Type: Application
    Filed: September 8, 2020
    Publication date: August 12, 2021
    Inventors: Mami Fujihara, Naoya Takai, Kazuki Tanaka, Takenori Yasuzumi, Yoshio Noguchi, Tsuyoshi Tokiwa
  • Patent number: 10090753
    Abstract: A power conversion device includes: a first power conversion circuit that converts power inputted from outside and outputs the converted power to a second power conversion circuit connected to the first power conversion circuit via a DC link, which outputs the converted power to a load; smoothing capacitors provided in an output part of the first power conversion circuit and an input part of the second power conversion circuit; a first and second common mode current extraction circuits provided in an input part of the first power conversion and second power conversion circuits; and a virtual neutral potential line that connects the first and second common mode current extraction circuits; a DC link filter circuit that includes a Y-shaped capacitor connected between the DC link part and the virtual neutral potential line.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: October 2, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei Hasegawa, Sari Maekawa, Takenori Yasuzumi, Atsuhiko Kuzumaki
  • Publication number: 20180278141
    Abstract: A power conversion device includes: a first power conversion circuit that converts power inputted from outside and outputs the converted power to a second power conversion circuit connected to the first power conversion circuit via a DC link, which outputs the converted power to a load; smoothing capacitors provided in an output part of the first power conversion circuit and an input part of the second power conversion circuit; a first and second common mode current extraction circuits provided in an input part of the first power conversion and second power conversion circuits; and a virtual neutral potential line that connects the first and second common mode current extraction circuits; a DC link filter circuit that includes a Y-shaped capacitor connected between the DC link part and the virtual neutral potential line.
    Type: Application
    Filed: March 20, 2018
    Publication date: September 27, 2018
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei Hasegawa, Sari Maekawa, Takenori Yasuzumi, Atsuhiko Kuzumaki
  • Patent number: 10084442
    Abstract: A semiconductor device according to an embodiment includes a normally-off transistor having a first source, a first drain, and a first gate; a normally-on transistor having a second source electrically connected to the first drain, a second drain, and a second gate, a capacitor having a first end and a second end, the second end being electrically connected to the second gate, a first diode having a first anode electrically connected between the second end and the second gate and having a first cathode electrically connected to the second source, a first resistor provided between the first end and the first gate, and a second diode having a second anode electrically connected to the first end and having a second cathode electrically connected to the first gate, the second diode being provided in parallel with the first resistor.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: September 25, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kentaro Ikeda, Takenori Yasuzumi, Kohei Hasegawa
  • Patent number: 9941874
    Abstract: A switching unit of an embodiment includes a first switching element of normally-on type, a second switching element of normally-off type having a non-reference potential side conductive terminal connected to a reference potential side conductive terminal of the first switching element, a resistive element having one end connected to a conduction control terminal of the first switching element; a series capacitor connected between the other end of the resistive element and a conduction control terminal of the second switching element; and a diode having an anode connected to the other end of the resistive element and a cathode connected to a common junction of the first switching element and the second switching element.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: April 10, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei Hasegawa, Takenori Yasuzumi
  • Patent number: 9923464
    Abstract: A switching device includes first and switching elements connected in series, a capacitor connected to a gate of the first switching element, a diode having an anode connected between the capacitor and the gate of the first switching element and a cathode connected to a source of the first switching element. A capacitance of the capacitor is equal to or greater than a value calculated by a predetermined expression.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: March 20, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei Hasegawa, Takenori Yasuzumi
  • Publication number: 20180076712
    Abstract: A switching device includes first and switching elements connected in series, a capacitor connected to a gate of the first switching element, a diode having an anode connected between the capacitor and the gate of the first switching element and a cathode connected to a source of the first switching element. A capacitance of the capacitor is equal to or greater than a value calculated by a predetermined expression.
    Type: Application
    Filed: March 1, 2017
    Publication date: March 15, 2018
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei HASEGAWA, Takenori YASUZUMI
  • Publication number: 20180019743
    Abstract: A switching unit of an embodiment includes a first switching element of normally-on type, a second switching element of normally-off type having a non-reference potential side conductive terminal connected to a reference potential side conductive terminal of the first switching element, a resistive element having one end connected to a conduction control terminal of the first switching element; a series capacitor connected between the other end of the resistive element and a conduction control terminal of the second switching element; and a diode having an anode connected to the other end of the resistive element and a cathode connected to a common junction of the first switching element and the second switching element.
    Type: Application
    Filed: September 27, 2017
    Publication date: January 18, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kohei HASEGAWA, Takenori Yasuzumi
  • Publication number: 20180013415
    Abstract: A semiconductor device according to an embodiment includes a normally-off transistor having a first source, a first drain, and a first gate; a normally-on transistor having a second source electrically connected to the first drain, a second drain, and a second gate, a capacitor having a first end and a second end, the second end being electrically connected to the second gate, a first diode having a first anode electrically connected between the second end and the second gate and having a first cathode electrically connected to the second source, a first resistor provided between the first end and the first gate, and a second diode having a second anode electrically connected to the first end and having a second cathode electrically connected to the first gate, the second diode being provided in parallel with the first resistor.
    Type: Application
    Filed: September 8, 2017
    Publication date: January 11, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kentaro IKEDA, Takenori YASUZUMI, Kohei HASEGAWA
  • Patent number: 9806706
    Abstract: A switching unit of an embodiment includes a first switching element of normally-on type, a second switching element of normally-off type having a non-reference potential side conductive terminal connected to a reference potential side conductive terminal of the first switching element, a series capacitor connected between a conduction control terminal of the first switching element and a conduction control terminal of the second switching element, and a diode having an anode connected to the conduction control terminal of the first switching element and a cathode connected to a common junction of the first switching element and the second switching element.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: October 31, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei Hasegawa, Takenori Yasuzumi
  • Publication number: 20160308444
    Abstract: A switching unit of an embodiment includes a first switching element of normally-on type, a second switching element of normally-off type having a non-reference potential side conductive terminal connected to a reference potential side conductive terminal of the first switching element, a series capacitor connected between a conduction control terminal of the first switching element and a conduction control terminal of the second switching element, and a diode having an anode connected to the conduction control terminal of the first switching element and a cathode connected to a common junction of the first switching element and the second switching element.
    Type: Application
    Filed: April 12, 2016
    Publication date: October 20, 2016
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kohei HASEGAWA, Takenori YASUZUMI
  • Publication number: 20150042235
    Abstract: According to one embodiment, a power supply device includes a substrate, a first inductor, and a second inductor. The substrate has a first surface and a second surface on opposite side from the first surface. The first inductor includes a first coil having a coil center axis substantially parallel to a first direction, is used for a switching circuit for controlling power supplied to a load, and is mounted on the first surface of the substrate. The second inductor includes a second coil having a coil center axis substantially parallel to the first direction, is electrically connected to the first inductor, and is mounted on the second surface of the substrate. As viewed in a direction orthogonal to the first surface, position of the first coil of the first inductor does not overlap position of the second coil of the second inductor.
    Type: Application
    Filed: March 19, 2014
    Publication date: February 12, 2015
    Applicants: TOSHIBA LIGHTING & TECHNOLOGY CORPORATION, KABUSHIKI KAISHA TOSHIBA
    Inventors: Takenori Yasuzumi, Noriyuki Kitamura