Patents by Inventor Toshiyuki Fujii

Toshiyuki Fujii 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: 12015354
    Abstract: A power converter includes an arm in which a plurality of converter cells are connected in series, each of the converter cells including at least two switching elements, a power storage element, and a pair of output terminals. A control device controls voltages of the plurality of converter cells by phase shift PWM control using a carrier signal for each converter cell. The converter cell includes a switch to have the converter cell bypassed. When the control device senses failure of the converter cell within the arm, it has a failed converter cell within the arm bypassed and rectifies uneven intervals among phases of carrier signals of a plurality of normal converter cells within the arm caused by failure of the converter cell.
    Type: Grant
    Filed: December 25, 2018
    Date of Patent: June 18, 2024
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takuya Kajiyama, Toshiyuki Fujii, Shuhei Fujiwara, Ryosuke Uda, Kazuyori Tahata
  • Patent number: 12009759
    Abstract: A power conversion system includes: a first power converter to perform power conversion between a first AC system and a DC circuit; and a second power converter to perform power conversion between a second AC system and the DC circuit. Each of the first power converter and the second power converter includes a plurality of submodules connected in series. Each of the plurality of submodules includes a plurality of switching elements and a capacitor. A first fundamental frequency of the first AC system is greater than a second fundamental frequency of the second AC system. A first average voltage value of a capacitor in a first submodule included in the first power converter is larger than a second average voltage value of a capacitor in a second submodule included in the second power converter.
    Type: Grant
    Filed: June 17, 2020
    Date of Patent: June 11, 2024
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshiyuki Kono, Shuhei Fujiwara, Ryosuke Uda, Takuya Kajiyama, Toshiyuki Fujii
  • Publication number: 20240132408
    Abstract: A rare earth aluminate sintered compact including rare earth aluminate phosphor crystalline phases and voids, wherein an absolute maximum length of 90% or more by number of rare earth aluminate phosphor crystalline phases is in a range from 0.4 ?m to 1.3 ?m, and an absolute maximum length of 90% or more by number of voids is in a range from 0.1 ?m to 1.2 ?m.
    Type: Application
    Filed: December 29, 2023
    Publication date: April 25, 2024
    Applicant: NICHIA CORPORATION
    Inventors: Shozo TAKETOMI, Ryo YAMAMOTO, Tomomi FUJII, Toshiyuki HIRAI
  • Publication number: 20240128887
    Abstract: A first voltage control circuitry controls a first representative value, i.e., an average-value corresponding value of DC capacitor voltages of all converter cells to follow an overall voltage command value. A phase balance control circuitry controls second representative values, i.e., average-value corresponding values of DC capacitor voltages of the converter cells in leg circuits for respective phases to follow the first representative value. A positive-negative balance control circuitry controls deviations of third representative values, i.e., average-value corresponding values of the DC capacitor voltages of the converter cells in the positive and negative arms of the leg circuits for respective phases to become zero between the positive and negative arms. An individual balance control circuitry controls DC capacitor voltages of all the converter cells to follow the third representative values.
    Type: Application
    Filed: April 5, 2021
    Publication date: April 18, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Miwako TANAKA, Toshiyuki FUJII, Takuya KAJIYAMA, Akito NAKAYAMA
  • Patent number: 11936306
    Abstract: In an MMC-based power conversion device, a control device generates, for each leg circuit, a first voltage command value not based on circulating current circulating between a plurality of leg circuits and a second voltage command value based on the circulating current. A plurality of individual controllers are provided respectively corresponding to a plurality of converter cells and generate a gate control signal for controlling turning on and off of a switching element of the corresponding converter cell, based on the first voltage command value and the second voltage command value. When generating the gate control signal using pulse width modulation, each individual controller modulates a carrier signal in accordance with the second voltage command value such that the pulse width of the gate control signal changes in accordance with the second voltage command value.
    Type: Grant
    Filed: September 9, 2019
    Date of Patent: March 19, 2024
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fuminori Nakamura, Takeshi Kikuchi, Daisuke Yamanaka, Takuya Kajiyama, Toshiyuki Fujii
  • Publication number: 20240087787
    Abstract: Disclosed herein is a coil component that includes a coil part embedded in a magnetic element body. The coil part has a structure in which plural interlayer insulating films and plural conductor layers having a coil pattern are alternately stacked. At least one of the conductor layers has a clearance area having no coil pattern and extending radially outward from a center axis of the coil part. The magnetic element body includes a first magnetic resin layer provided in an inner diameter area of the coil part, a second magnetic resin layer provided in a radially outside area of the coil part, and a fifth magnetic resin layer filled in the clearance area and contacting the first and second magnetic resin layers.
    Type: Application
    Filed: September 8, 2023
    Publication date: March 14, 2024
    Inventors: Yuki HASHIMOTO, Toshiyuki ABE, Takeshi OKUMURA, Tomonaga NISHIKAWA, Naoaki FUJII, Kazuhiro YOSHIKAWA
  • Publication number: 20240072642
    Abstract: A power conversion device includes a power converter connected between a multi-phase alternating-current circuit and a direct-current circuit, and a control device to control the power converter. The control device detects an unbalanced component indicating a voltage unbalanced component or a current unbalanced component of the alternating-current circuit and limits a magnitude of an alternating current flowing between the power converter and the alternating-current circuit based on the unbalanced component.
    Type: Application
    Filed: January 15, 2021
    Publication date: February 29, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takuya KAJIYAMA, Toshiyuki FUJII, Shuhei FUJIWARA, Yoshiyuki KONO, Ryosuke UDA
  • Patent number: 11909307
    Abstract: A power conversion device includes a power converter including a plurality of arms and a control device to control voltages of a plurality of sub modules by PWM control using a carrier signal for each sub module. The sub module includes a plurality of switching elements, a power storage element, a pair of output terminals, and a bypass switch. When the control device detects failure of a sub module in an arm, it performs stop processing for stopping a switching operation of the plurality of switching elements included in at least one sub module of the plurality of sub modules in the arm and has the sub module failure of which was detected bypassed. After the control device performs the stop processing, it equalizes intervals among phases of carrier signals of a plurality of normal sub modules in the arm caused by failure of the sub module.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: February 20, 2024
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazuyori Tahata, Shuhei Fujiwara, Takuya Kajiyama, Toshiyuki Fujii
  • Publication number: 20240022183
    Abstract: A power conversion device includes a power converter including a plurality of arms each having a plurality of converter cells cascaded to each other. A control device includes an AC current controller to control AC current flowing between the power converter and an AC circuit and a circulating current controller to control circulating current flowing between the arms of the power converter. The AC current controller reduces an effective value or amplitude value of AC current in a discharge operation mode in which a voltage of a power storage element of each converter cell is discharged, compared with in a normal operation mode. The circulating current controller increases an effective value or amplitude value of circulating current in the discharge operation mode, compared with in the normal operation mode.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 18, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takuya KAJIYAMA, Toshiyuki FUJII, Shuhei FUJIWARA, Kazuyori TAHATA
  • Patent number: 11857167
    Abstract: An image pickup unit includes: a metal barrel holding an objective lens; a substrate barrel formed of a circuit formed product having insulation property; an image sensor having a chip size package; plural electrodes formed in a penetrating manner from an inside of a substrate barrel to a proximal end side in an exposed manner, the plural electrodes being electrically connected to an image sensor in the substrate barrel; an electric conductive portion formed on an outer surface of the substrate barrel, having an insulation property with respect to the metal barrel, and having a predetermined creepage distance by which a current such as static electricity can be discharged; a ground electrode electrically connected to the electric conductive portion; and a cable provided with plural wires connected to a ground wire connected to the ground electrode and plural wires connected to the plural electrodes.
    Type: Grant
    Filed: February 26, 2021
    Date of Patent: January 2, 2024
    Assignee: OLYMPUS CORPORATION
    Inventors: Kyosuke Yoshida, Toshiyuki Fujii, Shun Ogi
  • Publication number: 20230411963
    Abstract: A reactive power compensation device includes a power converter and a converter control unit, and compensates reactive power of an AC power grid by output reactive power of the power converter. The converter control unit includes an AC voltage detection unit and an output limit unit. The AC voltage detection unit detects voltage information of the AC power grid to which the power converter is connected. The output limit unit determines whether or not the output reactive power of the power converter needs to be limited, on the basis of the voltage information detected by the AC voltage detection unit, and in a case where the output reactive power needs to be limited, limits the output reactive power of the power converter.
    Type: Application
    Filed: October 21, 2020
    Publication date: December 21, 2023
    Applicants: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Kaho MUKUNOKI, Toshiyuki FUJII, Akihiro MATSUDA, Ryota OKUYAMA
  • Publication number: 20230400167
    Abstract: A light emitting device includes a light emitting element and a lens, The lens includes a cover part and a light-shielding part. The cover part includes a lens part, a connection part, and a flange part which are formed of a thermosetting first resin and continuous to one another. The light-shielding part covers an outer lateral side of the connection part and is formed of a second resin having a greater light-absorptance or a greater light-reflectance than the first resin. The lens part is disposed at a location that allows light from the light emitting element to be transmitted through the lens part.
    Type: Application
    Filed: August 29, 2023
    Publication date: December 14, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Tsuyoshi OKAHISA, Toshiyuki FUJII
  • Publication number: 20230349459
    Abstract: A lid component is arranged to face an electric oil pump. The lid component includes an accommodation groove that accommodates at least a part of the electric oil pump on a surface side from which a lid-side connector protrudes.
    Type: Application
    Filed: June 2, 2021
    Publication date: November 2, 2023
    Applicants: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Moe HIDAKA, Yasuhiro YOSHIDA, Toshiyuki FUJII
  • Patent number: 11788708
    Abstract: A lens includes a cover part and a light-shielding part. The cover part includes a lens part, a connection part, and a flange part which are formed of a thermosetting first resin and continuous to one another. The light-shielding part covers an outer lateral side of the connection part and is formed of a second resin having a greater light-absorptance or a greater light-reflectance than the first resin.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: October 17, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Tsuyoshi Okahisa, Toshiyuki Fujii
  • Publication number: 20230291327
    Abstract: A power conversion system includes a plurality of power conversion devices connected to a plurality of AC systems, respectively. The power conversion devices are further connected to a common DC circuit. The power conversion system further includes a start-up device to start up each power conversion device. The start-up device selects an AC system that satisfies a defined condition relating to power supply capability from among the plurality of AC systems based on system information of the plurality of AC systems and starts up a power conversion device connected to the selected AC system.
    Type: Application
    Filed: August 21, 2020
    Publication date: September 14, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shuhei FUJIWARA, Yoshiyuki KONO, Ryosuke UDA, Takuya KAJIYAMA, Toshiyuki FUJII
  • Patent number: 11757377
    Abstract: A power conversion device includes: a power converter connected to an AC grid to which a load is connected; and a control circuit. The control circuit includes a harmonic compensation unit that includes a current command generation unit and a limit coefficient calculation unit and compensates for harmonic current contained in load current. The current command generation unit generates compensation current desired values for respective frequency components, and corrects the compensation current desired values using corresponding limit coefficients, to generate compensation current commands for respective frequency components. The limit coefficient calculation unit calculates each limit coefficient, on the basis of the compensation current desired value for each frequency component, and maximum voltage and maximum current that the power converter can output.
    Type: Grant
    Filed: March 17, 2020
    Date of Patent: September 12, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takato Toi, Takuya Kajiyama, Toshiyuki Fujii
  • Patent number: 11750080
    Abstract: A power converter includes an arm in which a plurality of converter cells are connected in series, each of the converter cells including at least two switching elements, a power storage element, and a pair of output terminals. A control device controls the power converter. The converter cell includes a switch to have the converter cell bypassed. When the control device senses failure of the converter cell, it has the failed converter cell within the arm bypassed and controls a normal converter cell within the arm to suppress a ratio of a harmonic component in an arm current that increases due to the failure.
    Type: Grant
    Filed: December 25, 2018
    Date of Patent: September 5, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takuya Kajiyama, Toshiyuki Fujii, Shuhei Fujiwara, Ryosuke Uda, Kazuyori Tahata
  • Publication number: 20230251452
    Abstract: A lens includes a cover part and an interposing member formed of a light-reflecting material. The cover part includes a lens part having a lateral side, a connection part constituting a lateral side wall extending from the lateral side, and a flange part having a lower surface disposed below the lateral side wall. The interposing member has an upper surface and an inner lateral surface. The upper surface is disposed on the lower surface of the flange part. The lens part and the interposing member define a recess having an opening facing downward. The lens part defines a bottom surface of the recess. The inner lateral surface defines a lateral surface of the recess, which defines the opening of the recess. The flange part extends outward from the opening. The lens part has a convex lens and a light-emitting surface with projections outward from the convex lens.
    Type: Application
    Filed: April 5, 2023
    Publication date: August 10, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Tsuyoshi OKAHISA, Toshiyuki FUJII, Tomohisa KISHIMOTO
  • Publication number: 20230170822
    Abstract: A power conversion device includes a power converter including a plurality of arms each having a plurality of converter cells connected to each other in cascade. Each converter cell includes a capacitor electrically connected to input/output terminals through a plurality of switching elements. A control device performs AC current control in accordance with a deviation between a detected AC current and an AC current command value and individual voltage control in accordance with a deviation between a voltage of each individual capacitor and an individual voltage command value. The control device calculates an evaluation value indicating the degree of variations in voltage of the individual capacitors. When the evaluation value is greater than a threshold value, the control device changes control of the power converter such that arm current flowing through each of the arms increases while the AC current control and the individual voltage control are being performed.
    Type: Application
    Filed: June 17, 2020
    Publication date: June 1, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shuhei FUJIWARA, Yoshiyuki KONO, Ryosuke UDA, Takuya KAJIYAMA, Toshiyuki FUJII, Shigeo HAYASHI
  • Publication number: 20230147142
    Abstract: A power conversion system includes: a first power converter to perform power conversion between a first AC system and a DC circuit; and a second power converter to perform power conversion between a second AC system and the DC circuit. Each of the first power converter and the second power converter includes a plurality of submodules connected in series. Each of the plurality of submodules includes a plurality of switching elements and a capacitor. A first fundamental frequency of the first AC system is greater than a second fundamental frequency of the second AC system. A first average voltage value of a capacitor in a first submodule included in the first power converter is larger than a second average voltage value of a capacitor in a second submodule included in the second power converter.
    Type: Application
    Filed: June 17, 2020
    Publication date: May 11, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshiyuki KONO, Shuhei FUJIWARA, Ryosuke UDA, Takuya KAJIYAMA, Toshiyuki FUJII