Patents by Inventor Takashi Togawa

Takashi Togawa 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: 11543447
    Abstract: A damage predicting device of a power semiconductor switching element includes a resistor connected to a gate of the power semiconductor switching element, and control circuitry. The control circuitry compares a detection voltage matching a voltage generated between two ends of the resistor and a reference voltage, and predicts that predetermined damage has been accumulated in a gate insulating layer in the power semiconductor switching element when the detection voltage exceeds the reference voltage.
    Type: Grant
    Filed: February 16, 2018
    Date of Patent: January 3, 2023
    Assignee: NIDEC CORPORATION
    Inventors: Hidetoshi Ikeda, Takashi Togawa
  • Patent number: 11271489
    Abstract: An alternating-current (AC)—direct-current (DC) power supply includes a circuit board including an alternating-current input terminal to which an alternating current is input and a direct-current output terminal from which a direct current is output. The AC-DC power supply includes a diode bridge that rectifies the alternating current input via the alternating-current input terminal, an alternating-current input line that electrically connects the alternating-current input terminal and the diode bridge, a coil connected to the diode bridge, a diode connected to the direct-current output terminal, a switching line that electrically connects the coil and the diode, and a switching element connected to the switching line. A portion of the switching line is disposed at right angles to a portion of the alternating-current input line.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: March 8, 2022
    Assignee: NIDEC CORPORATION
    Inventors: XiaoXia Sun, Haruki Kitakawa, Takashi Togawa
  • Publication number: 20210288587
    Abstract: An alternating-current (AC)—direct-current (DC) power supply includes a circuit board including an alternating-current input terminal to which an alternating current is input and a direct-current output terminal from which a direct current is output. The AC-DC power supply includes a diode bridge that rectifies the alternating current input via the alternating-current input terminal, an alternating-current input line that electrically connects the alternating-current input terminal and the diode bridge, a coil connected to the diode bridge, a diode connected to the direct-current output terminal, a switching line that electrically connects the coil and the diode, and a switching element connected to the switching line. A portion of the switching line is disposed at right angles to portion of the alternating-current input line.
    Type: Application
    Filed: November 9, 2017
    Publication date: September 16, 2021
    Inventors: XiaoXia SUN, Haruki KITAKAWA, Takashi TOGAWA
  • Publication number: 20200014295
    Abstract: A damage predicting device of a power semiconductor switching element includes a resistor connected to a gate of the power semiconductor switching element, and control circuitry. The control circuitry compares a detection voltage matching a voltage generated between two ends of the resistor and a reference voltage, and predicts that predetermined damage has been accumulated in a gate insulating layer in the power semiconductor switching element when the detection voltage exceeds the reference voltage.
    Type: Application
    Filed: February 16, 2018
    Publication date: January 9, 2020
    Inventors: Hidetoshi IKEDA, Takashi TOGAWA
  • Patent number: 5904444
    Abstract: A propelling apparatus includes a plurality of propellant cylinders series-connected to each other to be propelled by receiving a pushing force from behind, joints for series-connecting the propellant cylinders, a propellant head connected to a forward-most end of the propellant cylinders to be pressed into the earth, a leader member constituting a leading end of the propellant head, the leader member being rotatable about an axis of the propellant head by receiving a driving force from a driving device. An inclined pressure-receiving face is formed at a forward portion of the leader member for receiving an earth pressure in association with the underground propelling movement of the propellant head and steering the propellant head toward the direction of application of the earth pressure to the pressure-receiving face. The joint includes a flexible joint which is pivotally flexible about a transverse axis extending normal to an axis of the propellant cylinder.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: May 18, 1999
    Assignee: Kubota Corporation
    Inventors: Teruo Kabeuchi, Masaya Hattori, Takashi Togawa, Yukishige Yamada, Shigeaki Okuyama, Masao Nakagawa, Siro Sugiyama, Katsuhiko Mukuno, Kazunori Tsujimoto
  • Patent number: 5878825
    Abstract: An underground propelling method uses a propellant apparatus including a propellant head having a pressure receiving face portion inclined relative to an axis of the head and a plurality of propellant cylinders flexibly and pivotally connected in series to a rear end of the propellant head. The propellant apparatus is propelled under the ground by applying a thrust to the propellant apparatus from behind. Each propellant cylinder of the apparatus is pivotal about a single pivot axis thereof alone. The apparatus is propelled with the pressure receiving face portion thereof being oriented along a pivotal direction of the propellant cylinder about the pivot axis.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: March 9, 1999
    Assignee: Kubota Corporation
    Inventors: Shigeaki Okuyama, Teruo Kabeuchi, Katsuhiko Mukuno, Masaya Hattori, Kazunori Tsujimoto, Takashi Togawa, Yukishige Yamada, Masao Nakagawa, Siro Sugiyama