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).
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Publication number: 20240142511Abstract: 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: ApplicationFiled: August 22, 2023Publication date: May 2, 2024Applicant: FUJI ELECTRIC CO., LTD.Inventor: Yuki KUMAZAWA
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Patent number: 11965468Abstract: 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: GrantFiled: August 7, 2023Date of Patent: April 23, 2024Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shinnosuke Honda, Yoshinori Fujitake, Suguru Kumazawa, Motohiko Taniyama, Keita Sato, Yuki Iizawa, Yoshiyuki Shogenji, Yasutaka Tsuchida
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Publication number: 20240014813Abstract: 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: ApplicationFiled: September 26, 2023Publication date: January 11, 2024Applicant: FUJI ELECTRIC CO., LTD.Inventor: Yuki KUMAZAWA
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Publication number: 20230378951Abstract: 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: ApplicationFiled: March 30, 2023Publication date: November 23, 2023Applicant: FUJI ELECTRIC CO., LTD.Inventor: Yuki KUMAZAWA
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Patent number: 11824464Abstract: 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: GrantFiled: July 23, 2021Date of Patent: November 21, 2023Assignee: FUJI ELECTRIC CO., LTD.Inventor: Yuki Kumazawa
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Publication number: 20220069735Abstract: 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: ApplicationFiled: July 23, 2021Publication date: March 3, 2022Applicant: FUJI ELECTRIC CO., LTD.Inventor: Yuki KUMAZAWA
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Patent number: 10821916Abstract: 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: GrantFiled: February 1, 2017Date of Patent: November 3, 2020Assignee: KASAI KOGYO CO., LTD.Inventors: Tatsushi Ohno, Nobuaki Seki, Yuki Kumazawa
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Publication number: 20190270415Abstract: 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: ApplicationFiled: February 1, 2017Publication date: September 5, 2019Inventors: Tatsushi OHNO, Nobuaki SEKI, Yuki KUMAZAWA