Patents by Inventor Yasushige Mukunoki

Yasushige Mukunoki 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: 20240162829
    Abstract: A power conversion device includes a housing, a door, a power converter, and a movable portion. Housing includes an opening and an internal space. Door is connected to housing. Power converter is disposed in internal space with a gap from housing. Movable portion is disposed in internal space. Movable portion is configured to be detachable with respect to power converter. Door is configured to be switchable between an open state in which opening is open and a closed state in which opening (OP) is closed. Power converter is configured to be grounded via movable portion in the open state of door. Power converter is configured to be disposed with a gap from movable portion in the closed state of door.
    Type: Application
    Filed: April 1, 2021
    Publication date: May 16, 2024
    Applicants: Mitsubishi Electric Corporation, Toshiba Mitsubishi-Electric Industrial Systems Corporation
    Inventors: Yasushige MUKUNOKI, Takeshi HORIGUCHI, Hiroki SHIGETA
  • Patent number: 11791746
    Abstract: A power converter is provided that includes a reactor that is improved in effect of cooling a core and a winding. The power converter includes: a cooling member having a first cooling surface; and a reactor including a core portion and a winding portion. The core portion is a rectangular parallelepiped and disposed on the first cooling surface that is larger in area than the core portion in a plan view. The winding is wound around the core portion and the cooling member. The power converter further includes a power conversion module connected to one end of the winding portion.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: October 17, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasushige Mukunoki, Takeshi Horiguchi, Kimiyuki Koyanagi
  • Publication number: 20230320014
    Abstract: A connection structure includes a circuit board, an insulating member, a housing, and a conductive wire. The insulating member includes a first portion and a second portion. The first portion is fixed to the circuit board. The second portion faces the first portion. The second portion is fixed to the housing. The housing includes a grounded contact. The conductive wire electrically connects the circuit board and the housing while being wound around the insulating member. A shortest distance along a surface of the housing from a position where the conductive wire and the housing are connected to the contact is shorter than a shortest distance along a surface of the housing from the second portion of the insulating member to the contact.
    Type: Application
    Filed: September 3, 2020
    Publication date: October 5, 2023
    Applicants: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Yasushige MUKUNOKI, Takeshi HORIGUCHI, Hiroki SHIGETA
  • Publication number: 20230261653
    Abstract: A short-circuit detector detects an arm short circuit or a load short circuit, based on the magnitude of the gate current and the magnitude of the gate charge amount. The short-circuit detector includes: a gate current determinator that compares the magnitude of the gate current with at least one reference value; a gate charge amount determinator that compares the magnitude of the gate charge amount with at least one reference value; and a short-circuit detection logical operation circuitry that executes a logical operation of an output signal of the gate current determinator and an output signal of the gate charge amount determinator.
    Type: Application
    Filed: August 25, 2020
    Publication date: August 17, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi HORIGUCHI, Yasushige MUKUNOKI
  • Publication number: 20230261654
    Abstract: A semiconductor device includes a power switching element and a drive device to drive the power switching element. The drive device includes a voltage source, a switching element, a capacitor connected in parallel to the voltage source with the switching element being interposed, a switching element provided between the capacitor and a gate terminal of the power switching element, a first comparison device to output a result of comparison between a voltage of the capacitor and a reference value VQR, a second comparison device to output a result of comparison between a gate voltage of the power switching element and a reference value VR, and a short-circuit determination unit that makes determination as to a short circuit of the power switching element based on an output signal from the first comparison device and an output signal from the second comparison device.
    Type: Application
    Filed: September 7, 2020
    Publication date: August 17, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yohei MITSUI, Yasutaka IMAMURA, Takeshi HORIGUCHI, Yasushige MUKUNOKI
  • Publication number: 20220052624
    Abstract: A power converter is provided that includes a reactor that is improved in effect of cooling a core and a winding. The power converter includes: a cooling member having a first cooling surface; and a reactor including a core portion and a winding portion. The core portion is a rectangular parallelepiped and disposed on the first cooling surface that is larger in area than the core portion in a plan view. The winding is wound around the core portion and the cooling member. The power converter further includes a power conversion module connected to one end of the winding portion.
    Type: Application
    Filed: November 15, 2018
    Publication date: February 17, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasushige MUKUNOKI, Takeshi HORIGUCHI, Kimiyuki KOYANAGI
  • Patent number: 11012066
    Abstract: A plurality of drive circuits each drive a corresponding one of a plurality of power semiconductor elements connected in parallel. Each of the drive circuits includes a control command unit, a current detector, a differentiator, and an integrator. The current detector detects a gate current that flows into a gate terminal of a corresponding one of the power semiconductor elements after the control command unit outputs a turn-on command. The differentiator performs time differentiation of the gate current detected by the current detector. The integrator performs time integration of the gate current detected by the current detector. Based on a differential value and an integral value in each of the drive circuits, the determination unit determines whether an overcurrent state occurs or not in any of the plurality of power semiconductor elements.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: May 18, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasushige Mukunoki, Takeshi Horiguchi
  • Publication number: 20200412356
    Abstract: A plurality of drive circuits each drive a corresponding one of a plurality of power semiconductor elements connected in parallel. Each of the drive circuits includes a control command unit, a current detector, a differentiator, and an integrator. The current detector detects a gate current that flows into a gate terminal of a corresponding one of the power semiconductor elements after the control command unit outputs a turn-on command. The differentiator performs time differentiation of the gate current detected by the current detector. The integrator performs time integration of the gate current detected by the current detector. Based on a differential value and an integral value in each of the drive circuits, the determination unit determines whether an overcurrent state occurs or not in any of the plurality of power semiconductor elements.
    Type: Application
    Filed: January 11, 2019
    Publication date: December 31, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasushige MUKUNOKI, Takeshi HORIGUCHI
  • Patent number: 10790813
    Abstract: A drive circuit for a power semiconductor element according to the present disclosure includes: a control command unit that outputs a turn-on command for a power semiconductor element; a gate voltage detection unit that detects a gate voltage applied to a gate terminal after the control command unit outputs the turn-on command; a differentiator that subjects the gate voltage detected by the gate voltage detection unit to time differentiation; and a determination unit that determines, based on the gate voltage detected by the gate voltage detection unit and a differential value by the differentiator, whether the power semiconductor element is in a short-circuit state or not.
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: September 29, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasushige Mukunoki, Takashi Masuhara, Takeshi Horiguchi
  • Publication number: 20200212906
    Abstract: A drive circuit for a power semiconductor element according to the present disclosure includes: a control command unit that outputs a turn-on command for a power semiconductor element; a gate voltage detection unit that detects a gate voltage applied to a gate terminal after the control command unit outputs the turn-on command; a differentiator that subjects the gate voltage detected by the gate voltage detection unit to time differentiation; and a determination unit that determines, based on the gate voltage detected by the gate voltage detection unit and a differential value by the differentiator, whether the power semiconductor element is in a short-circuit state or not.
    Type: Application
    Filed: May 17, 2018
    Publication date: July 2, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasushige MUKUNOKI, Takashi MASUHARA, Takeshi HORIGUCHI
  • Patent number: 10581337
    Abstract: A diode rectifier rectifies an AC voltage output from a neutral-grounding three-phase AC power supply to a DC voltage. A smoothing capacitor smoothes the DC voltage rectified by the diode rectifier. An inverter converts the DC voltage smoothed by the smoothing capacitor into a desired AC voltage. A bidirectional switch and a Y capacitor are connected in series between one end of the smoothing capacitor and the ground. A detector detects a voltage across both ends of the smoothing capacitor. A controller drives the bidirectional switch in response to an output of the detector.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: March 3, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasushige Mukunoki, Yasushi Nakayama, Hiroyasu Iwabuki, Yuki Ishii, Keisuke Iwasawa
  • Patent number: 10134718
    Abstract: A power semiconductor module including a positive-side switching device and a positive-side diode device which are mounted on a positive-side conductive pattern, and a negative-side switching device and a negative-side diode device which are mounted on an output-side conductive pattern. When an insulating substrate is viewed in plan view, the positive-side diode device and the negative-side diode device are disposed between the positive-side switching device and the negative-side switching device, and the negative-side diode device is disposed closer to the positive-side switching device than the positive-side diode device is.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: November 20, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasushige Mukunoki, Yoshiko Tamada
  • Publication number: 20180190636
    Abstract: A power semiconductor module including a positive-side switching device and a positive-side diode device which are mounted on a positive-side conductive pattern, and a negative-side switching device and a negative-side diode device which are mounted on an output-side conductive pattern. When an insulating substrate is viewed in plan view, the positive-side diode device and the negative-side diode device are disposed between the positive-side switching device and the negative-side switching device, and the negative-side diode device is disposed closer to the positive-side switching device than the positive-side diode device is.
    Type: Application
    Filed: June 28, 2016
    Publication date: July 5, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasushige MUKUNOKI, Yoshiko TAMADA
  • Publication number: 20180159439
    Abstract: A diode rectifier rectifies an AC voltage output from a neutral-grounding three-phase AC power supply to a DC voltage. A smoothing capacitor smoothes the DC voltage rectified by the diode rectifier. An inverter converts the DC voltage smoothed by the smoothing capacitor into a desired AC voltage. A bidirectional switch and a Y capacitor are connected in series between one end of the smoothing capacitor and the ground. A detector detects a voltage across both ends of the smoothing capacitor. A controller drives the bidirectional switch in response to an output of the detector.
    Type: Application
    Filed: July 14, 2016
    Publication date: June 7, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasushige MUKUNOKI, Yasushi NAKAYAMA, Hiroyasu IWABUKI, Yuki ISHII, Keisuke IWASAWA
  • Patent number: 9812934
    Abstract: An inverter device is formed of the two systems of inverters stored inside a cylindrical metal casing. Each inverter converts DC power to three-phase AC power. The inverters are formed of power semiconductor elements, DC bus bars through which DC power supplied to the respective power semiconductor elements, capacitors connected to the DC bus bars, and switches connected between the respective DC bus bars and the DC input terminals. High-impedance switches are disposed in the vicinity of the DC input terminals. Hence, electromagnetic noises generated by switching actions of the power semiconductor elements are circulated within the inverters by way of the capacitors and eventually attenuated.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: November 7, 2017
    Assignee: Mistubishi Electric Corporation
    Inventor: Yasushige Mukunoki
  • Patent number: 9647509
    Abstract: A surface of a plate (102) having a predetermined thickness is used as a cooling surface (101). A pair of cooling medium entrance and exit (111, 112) are provided on one end surface (102a). First and second cooling medium flow paths (131, 132), a cooling medium branch path (121) communicating with the cooling medium entrance (111) and used for dividing cooling medium to flow into the cooling medium flow paths (131, 132), and a cooling medium merging path (122) at which the cooling media flowing from the exits of the cooling medium flow paths (131, 132) merge, are formed on a surface opposite to the cooling surface (101).
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: May 9, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasushige Mukunoki, Takaharu Suzuki, Hidehito Yamauchi
  • Publication number: 20160013706
    Abstract: An inverter device is formed of the two systems of inverters stored inside a cylindrical metal casing. Each inverter converts DC power to three-phase AC power. The inverters are formed of power semiconductor elements, DC bus bars through which DC power supplied to the respective power semiconductor elements, capacitors connected to the DC bus bars, and switches connected between the respective DC bus bars and the DC input terminals. High-impedance switches are disposed in the vicinity of the DC input terminals. Hence, electromagnetic noises generated by switching actions of the power semiconductor elements are circulated within the inverters by way of the capacitors and eventually attenuated.
    Type: Application
    Filed: September 26, 2013
    Publication date: January 14, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventor: Yasushige MUKUNOKI
  • Publication number: 20140125164
    Abstract: A surface of a plate (102) having a predetermined thickness is used as a cooling surface (101). A pair of cooling medium entrance and exit (111, 112) are provided on one end surface (102a). First and second cooling medium flow paths (131, 132), a cooling medium branch path (121) communicating with the cooling medium entrance (111) and used for dividing cooling medium to flow into the cooling medium flow paths (131, 132), and a cooling medium merging path (122) at which the cooling media flowing from the exits of the cooling medium flow paths (131, 132) merge, are formed on a surface opposite to the cooling surface (101).
    Type: Application
    Filed: July 19, 2011
    Publication date: May 8, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasushige Mukunoki, Takaharu Suzuki, Hidehito Yamauchi