Patents by Inventor Yuki KUMAZAWA

Yuki KUMAZAWA 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: 20240142511
    Abstract: A semiconductor device, including: a power semiconductor element having a current output electrode; a wire bonded to the current output electrode; and a degradation detection circuit configured to monitor a temporal change of a voltage value of the wire while a constant current flows through the wire, responsive to satisfaction of a plurality of conditions including that the power semiconductor element is in a turn-off state, and that a temperature of the power semiconductor element is within a predetermined temperature range.
    Type: Application
    Filed: August 22, 2023
    Publication date: May 2, 2024
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Yuki KUMAZAWA
  • Patent number: 11965468
    Abstract: A vehicle control system, a vehicle control method, and a storage medium are provided. A stopping process stops fuel supply to one or more stopping cylinders and supplies fuel to one or more remaining cylinders during a load operation of an engine. During execution of the stopping process, a compensating process compensates for a decrease in output of the one or more stopping cylinders due to the execution of the stopping process by increasing output generated by combustion in the one or more remaining cylinders. The system control circuit causes, when the engine rotation speed of the engine is the same, the output after being increased by the compensating process to decrease as a shaft torque of the crankshaft of the engine increases.
    Type: Grant
    Filed: August 7, 2023
    Date of Patent: April 23, 2024
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shinnosuke Honda, Yoshinori Fujitake, Suguru Kumazawa, Motohiko Taniyama, Keita Sato, Yuki Iizawa, Yoshiyuki Shogenji, Yasutaka Tsuchida
  • Publication number: 20240014813
    Abstract: An object of the present invention is to provide a semiconductor device capable of suppressing loss in a switching element at high temperature without increasing radiation noise of the switching element. A semiconductor device includes an IGBT including a gate to which a gate signal is input, a temperature detection element that detects temperature of the IGBT, and a capacitance adjustment unit that is arranged between the gate of the IGBT and a reference potential terminal and that adjusts a capacitance between the gate and an emitter of the IGBT according to a detection temperature detected by the temperature detection element.
    Type: Application
    Filed: September 26, 2023
    Publication date: January 11, 2024
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Yuki KUMAZAWA
  • Publication number: 20230378951
    Abstract: A semiconductor device having a semiconductor chip and a control circuit. The semiconductor chip has a gate electrode pad connected to the gate of an output element and the gate of a current monitor element, a sense emitter electrode pad connected to the sense emitter of the current monitor element and to the anode of the temperature detection diode via a current limiting element, and a cathode electrode pad that is connected to the cathode of the temperature detection diode, the cathode being grounded without being connected to the emitter of the output element. In a temperature detection mode, the control circuit receives a temperature detection voltage via the sense emitter electrode pad and detects the temperature state of the output element. In a current detection mode, the control circuit receives a sense current via the sense emitter electrode pad and detects the current state of the output element.
    Type: Application
    Filed: March 30, 2023
    Publication date: November 23, 2023
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Yuki KUMAZAWA
  • Patent number: 11824464
    Abstract: The present invention is directed to provide a semiconductor device capable of protecting a switching element even though having a capacitor connected to a control signal input terminal of the switching element. Semiconductor device includes an IGBT including a gate configured to be input a gate signal and a current detection terminal used to detect at least one of overcurrent or short-circuit current, a gate capacitor arranged between the gate and a reference potential terminal, the gate capacitor being disconnected from the gate as needed, and a disconnection unit configured to disconnect a connection between the gate capacitor and the gate when a detection current being a current output from the current detection terminal is equal to or larger than a first current set on a basis of a minimum current causing oscillation in a loop circuit formed by including the IGBT and the gate capacitor.
    Type: Grant
    Filed: July 23, 2021
    Date of Patent: November 21, 2023
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Yuki Kumazawa
  • Publication number: 20220069735
    Abstract: The present invention is directed to provide a semiconductor device capable of protecting a switching element even though having a capacitor connected to a control signal input terminal of the switching element. Semiconductor device includes an IGBT including a gate configured to be input a gate signal and a current detection terminal used to detect at least one of overcurrent or short-circuit current, a gate capacitor arranged between the gate and a reference potential terminal, the gate capacitor being disconnected from the gate as needed, and a disconnection unit configured to disconnect a connection between the gate capacitor and the gate when a detection current being a current output from the current detection terminal is equal to or larger than a first current set on a basis of a minimum current causing oscillation in a loop circuit formed by including the IGBT and the gate capacitor.
    Type: Application
    Filed: July 23, 2021
    Publication date: March 3, 2022
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Yuki KUMAZAWA
  • Patent number: 10821916
    Abstract: An automotive interior component includes a base member including a front surface, a back surface, and a side surface provided between the front surface and the back surface; and a skin material integrated with the base member. The skin material is integrated with the front surface and the side surface. The side surface of the base member is continuous to the front surface of the base member while forming an acute angle of angle ? therewith. The skin material includes an end surface extending along the side surface of the base member. The present invention provides the automotive interior component with a neat appearance.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: November 3, 2020
    Assignee: KASAI KOGYO CO., LTD.
    Inventors: Tatsushi Ohno, Nobuaki Seki, Yuki Kumazawa
  • Publication number: 20190270415
    Abstract: An automotive interior component includes a base member including a front surface, a back surface, and a side surface provided between the front surface and the back surface; and a skin material integrated with the base member. The skin material is integrated with the front surface and the side surface. The side surface of the base member is continuous to the front surface of the base member while forming an acute angle of angle ? therewith. The skin material includes an end surface extending along the side surface of the base member. The present invention provides the automotive interior component with a neat appearance.
    Type: Application
    Filed: February 1, 2017
    Publication date: September 5, 2019
    Inventors: Tatsushi OHNO, Nobuaki SEKI, Yuki KUMAZAWA