Patents by Inventor Katsushi Nakada

Katsushi Nakada 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: 20240339373
    Abstract: Provided is a semiconductor power module in which an electric field at corners of electrodes and around the corners is reduced while size reduction and voltage increase are achieved. The semiconductor power module includes a plurality of electrodes having different potentials and laid over each other with an interval therebetween. As seen in a direction in which the plurality of electrodes are laid over each other, each of the plurality of electrodes has three or more corners, at least a part of the corner of one of adjacent two of the electrodes is provided on an outer side relative to another of the adjacent two electrodes, and at least a part of the corner of the other electrode is provided on an outer side relative to the one electrode.
    Type: Application
    Filed: July 24, 2023
    Publication date: October 10, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Katsushi NAKADA, Yoshitaka MIYAJI
  • Patent number: 11735906
    Abstract: To provide a power converter and a breaking mechanism which can break a DC current and can suppress that a fused material scatter to other circuits at fusing, in the case where the breaking mechanism of excess current is formed by a circuit pattern of a circuit board. In a power converter, a supporting member is provided with a support body part; a fixation projection part which projected from the support body part and to which the multilayer circuit board was fixed; and a support projection part which projected from the support body part and supports an one side circuit board face, wherein the fuse pattern is provided in an inner layer, and the support projection part overlaps with at least one part of a fusing part of the fuse pattern, viewing in a normal direction of the circuit board face of the multilayer circuit board.
    Type: Grant
    Filed: June 27, 2022
    Date of Patent: August 22, 2023
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsushi Nakada, Kenta Fujii
  • Patent number: 11658467
    Abstract: Provided is a busbar connecting device that can achieve good workability and high reliability at the same time. The busbar connecting device includes: a connection portion in which a busbar conductor and a current conductor of a bushing are connected; an insulation busbar connector covering the connection portion; a work hole communicating with the connection portion from an outside of the insulation busbar connector; and an insulating plug inserted into the work hole and sealing the insulation busbar connector, wherein a surface pressure between an inner circumferential surface of the work hole and an outer circumferential surface of the insulating plug is greater at a deep part of the work hole than at a shallow part of the work hole.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: May 23, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shintaro Yamada, Katsushi Nakada, Katsuki Hotta, Yasutomo Otake, Takao Tsurimoto, Shintaro Kuroaki
  • Publication number: 20230006438
    Abstract: To provide a power converter and a breaking mechanism which can break a DC current and can suppress that a fused material scatter to other circuits at fusing, in the case where the breaking mechanism of excess current is formed by a circuit pattern of a circuit board. In a power converter, a supporting member is provided with a support body part; a fixation projection part which projected from the support body part and to which the multilayer circuit board was fixed; and a support projection part which projected from the support body part and supports an one side circuit board face, wherein the fuse pattern is provided in an inner layer, and the support projection part overlaps with at least one part of a fusing part of the fuse pattern, viewing in a normal direction of the circuit board face of the multilayer circuit board.
    Type: Application
    Filed: June 27, 2022
    Publication date: January 5, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Katsushi NAKADA, Kenta FUJII
  • Publication number: 20220208499
    Abstract: To provide a power converter and a breaking mechanism which can break a DC current and can suppress that a fused material scatter to other circuits at fusing, in the case the breaking mechanism of excess current is formed by a circuit pattern of a circuit board. A breaking mechanism is formed by a multilayer circuit board, and is provided with one or two fuse patterns which fuse when excessive current flows, and a scattering prevention pattern, wherein the one or two fuse patterns are provided in an inner layer, and wherein the scattering prevention pattern is provided in a layer different from the one or the two fuse patterns, and overlaps with at least a part of a fusing part of each of the one or two fuse patterns, viewing in a normal direction of a circuit board face.
    Type: Application
    Filed: October 18, 2021
    Publication date: June 30, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Katsushi NAKADA, Shingo TAKABUCHI, Kenta FUJII
  • Patent number: 11251105
    Abstract: The semiconductor device includes: a semiconductor module including a plate-shaped semiconductor element, a conductor electrically connected to one surface of the semiconductor element, a heat dissipation plate of which one surface is thermally and electrically connected to another surface of the semiconductor element, a resin member sealing the semiconductor element, the conductor, and the heat dissipation plate, and an insulation heat dissipation member thermally connected to another surface of the heat dissipation plate exposed from the resin member; a heatsink thermally connected to the insulation heat dissipation member; and an electric field inhibiting plate including a plate-shaped thin part covering the one surface of the semiconductor element and opposed thereto so as to be separated therefrom, the thin part being sealed by the resin member, and a connection part extending from the thin part to the heatsink and thermally and electrically connected to the heatsink.
    Type: Grant
    Filed: October 29, 2020
    Date of Patent: February 15, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsushi Nakada, Hiroki Shiota, Masakazu Tani, Yoshitaka Miyaji, Mao Sawakawa
  • Publication number: 20220006270
    Abstract: Provided is a busbar connecting device that can achieve good workability and high reliability at the same time. The busbar connecting device includes: a connection portion in which a busbar conductor and a current conductor of a bushing are connected; an insulation busbar connector covering the connection portion; a work hole communicating with the connection portion from an outside of the insulation busbar connector; and an insulating plug inserted into the work hole and sealing the insulation busbar connector, wherein a surface pressure between an inner circumferential surface of the work hole and an outer circumferential surface of the insulating plug is greater at a deep part of the work hole than at a shallow part of the work hole.
    Type: Application
    Filed: December 26, 2018
    Publication date: January 6, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shintaro YAMADA, Katsushi NAKADA, Katsuki HOTTA, Yasutomo OTAKE, Takao TSURIMOTO, Shintaro KUROAKI
  • Publication number: 20210398873
    Abstract: The semiconductor device includes: a semiconductor module including a plate-shaped semiconductor element, a conductor electrically connected to one surface of the semiconductor element, a heat dissipation plate of which one surface is thermally and electrically connected to another surface of the semiconductor element, a resin member sealing the semiconductor element, the conductor, and the heat dissipation plate, and an insulation heat dissipation member thermally connected to another surface of the heat dissipation plate exposed from the resin member; a heatsink thermally connected to the insulation heat dissipation member; and an electric field inhibiting plate including a plate-shaped thin part covering the one surface of the semiconductor element and opposed thereto so as to be separated therefrom, the thin part being sealed by the resin member, and a connection part extending from the thin part to the heatsink and thermally and electrically connected to the heatsink.
    Type: Application
    Filed: October 29, 2020
    Publication date: December 23, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Katsushi NAKADA, Hiroki SHIOTA, Masakazu TANI, Yoshitaka MIYAJI, Mao SAWAKAWA
  • Patent number: 11031192
    Abstract: A switchgear includes a movable part capable of reciprocating movement in first and second directions, a movable contact coupled to the movable part and capable of reciprocating movement relative to the movable part, a biasing member that biases the movable contact, a latch part capable of switching between a first state in which movement of the movable contact in the first direction is restricted and a second state in which movement of the movable contact in the first direction is permitted, and a fixed contact provided on a side of the first direction with respect to the movable contact. When the movable part and the movable contact move in the first direction, after movement for a predetermined distance, the movement of the movable contact is restricted by the latch part in the first state, and then, when the movable part has moved further in the first direction, the latch part is switched to the second state.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: June 8, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masato Kubota, Katsushi Nakada
  • Patent number: 10910799
    Abstract: In a connecting device of an electrical apparatus in which a first solid insulator and a second solid insulator each molded as a solid insulator on a periphery of a center conductor are connected to each other via a flexible insulator, a high voltage electrode having an outer diameter larger than those of the center conductors is disposed in the second solid insulator, and a ground electrode having an inner diameter smaller than that of an outer ground layer of the second solid insulator and larger than the outer diameter of the high voltage electrode is disposed in the first solid insulator. Electric field directions at an interface between the first solid insulator and the flexible insulator and at an interface between the second solid insulator and the flexible insulator are directions along the respective interfaces.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: February 2, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasutomo Otake, Takahiro Umemoto, Manabu Yoshimura, Katsushi Nakada
  • Publication number: 20200373100
    Abstract: A switchgear includes a movable part capable of reciprocating movement in first and second directions, a movable contact coupled to the movable part and capable of reciprocating movement relative to the movable part, a biasing member that biases the movable contact, a latch part capable of switching between a first state in which movement of the movable contact in the first direction is restricted and a second state in which movement of the movable contact in the first direction is permitted, and a fixed contact provided on a side of the first direction with respect to the movable contact. When the movable part and the movable contact move in the first direction, after movement for a predetermined distance, the movement of the movable contact is restricted by the latch part in the first state, and then, when the movable part has moved further in the first direction, the latch part is switched to the second state.
    Type: Application
    Filed: September 28, 2017
    Publication date: November 26, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masato KUBOTA, Katsushi NAKADA
  • Patent number: 10566155
    Abstract: A switch includes: a first contact and a second contact placed on an operation axis and facing each other; an urging part that urges the second contact to a first contact side; and a second magnetic material part that engages with the second contact to restrict the second contact from moving to the first contact side. The switch also includes: a conductor part that passes current when an arc is formed between the first contact and the second contact; and a first magnetic material part that surrounds the conductor part. When current flows through the conductor part, the second magnetic material part is disengaged from the second contact.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: February 18, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasuhiro Tsukao, Katsushi Nakada
  • Publication number: 20190371546
    Abstract: A switch includes: a first contact and a second contact placed on an operation axis and facing each other; an urging part that urges the second contact to a first contact side; and a second magnetic material part that engages with the second contact to restrict the second contact from moving to the first contact side. The switch also includes: a conductor part that passes current when an arc is formed between the first contact and the second contact; and a first magnetic material part that surrounds the conductor part. When current flows through the conductor part, the second magnetic material part is disengaged from the second contact.
    Type: Application
    Filed: April 6, 2016
    Publication date: December 5, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasuhiro TSUKAO, Katsushi NAKADA
  • Publication number: 20190058308
    Abstract: In a connecting device of an electrical apparatus in which a first solid insulator and a second solid insulator each molded as a solid insulator on a periphery of a center conductor are connected to each other via a flexible insulator, a high voltage electrode having an outer diameter larger than those of the center conductors is disposed in the second solid insulator, and a ground electrode having an inner diameter smaller than that of an outer ground layer of the second solid insulator and larger than the outer diameter of the high voltage electrode is disposed in the first solid insulator. Electric field directions at an interface between the first solid insulator and the flexible insulator and at an interface between the second solid insulator and the flexible insulator are directions along the respective interfaces.
    Type: Application
    Filed: September 30, 2016
    Publication date: February 21, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasutomo OTAKE, Takahiro UMEMOTO, Manabu YOSHIMURA, Katsushi NAKADA
  • Patent number: 10033169
    Abstract: A first opposing surface inclination angle of a protruding first solid insulating material of a first high-voltage device is smaller than a second opposing surface inclination angle of a dented second solid insulating material of a second high-voltage device. A hollow truncated-cone flexible insulating material of which the thickness before insertion between the first high-voltage device and the second high-voltage device is the same at every part and the elasticity modulus gradually increases from a small-diameter side toward a large-diameter side, or a hollow truncated-cone flexible insulating material of which the thickness before insertion gradually increases from a small-diameter side toward a large-diameter side and the elasticity modulus is the same at every part, is compressed and sandwiched between the first solid insulating material and the second solid insulating material.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: July 24, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiro Umemoto, Yasutomo Otake, Manabu Yoshimura, Katsushi Nakada
  • Publication number: 20180034251
    Abstract: A first opposing surface inclination angle of a protruding first solid insulating material of a first high-voltage device is smaller than a second opposing surface inclination angle of a dented second solid insulating material of a second high-voltage device. A hollow truncated-cone flexible insulating material of which the thickness before insertion between the first high-voltage device and the second high-voltage device is the same at every part and the elasticity modulus gradually increases from a small-diameter side toward a large-diameter side, or a hollow truncated-cone flexible insulating material of which the thickness before insertion gradually increases from a small-diameter side toward a large-diameter side and the elasticity modulus is the same at every part, is compressed and sandwiched between the first solid insulating material and the second solid insulating material.
    Type: Application
    Filed: March 28, 2016
    Publication date: February 1, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takahiro UMEMOTO, Yasutomo OTAKE, Manabu YOSHIMURA, Katsushi NAKADA
  • Patent number: 9431800
    Abstract: A gas-insulated electric device, by which a cross-sectional area of a central conductor can be reduced. The gas-insulated electric device includes an insulation tube that ranges to portions facing to ground potential portions for a central conductor and to upper-lower portions along the grounding potential portions, and is coaxially arranged along the central conductor in a state where a gap intervenes between the central conductor and the insulation tube; a conductive layer that is formed on an inner surface of an insulation tube and is electrically connected to the central conductor; and a ground layer that is formed on an inner surface or an outer surface of the insulation tube and is grounded; in which heat generated from the central conductor is radiated by convecting the insulation gas through the gap between the central conductor and insulation tube.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: August 30, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tadahiro Yoshida, Kazuki Takahashi, Katsushi Nakada, Masahiro Arioka
  • Patent number: 9117608
    Abstract: A switchgear includes a fixed contactor provided in a tank filled with insulating gas, and a movable contactor provided in the tank, the movable contactor being connected to and disconnected from the fixed contactor so as to move forward and backward. The switchgear includes an arc extinction member including a surrounding portion which is slidably connected to the outer circumferential surface of the movable contactor halfway in a movement range from a close contact state to an open contact state and is formed so as to surround an arc space portion in a sealed manner, the surrounding portion being formed with a through hole through which the arc space communicates with the outside of the arc space.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: August 25, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsushi Nakada, Katsuhiko Horinouchi
  • Patent number: 9076614
    Abstract: A switchgear includes a fixed contactor provided in a tank filled with insulating gas, and a movable contactor provided in the tank, the movable contactor being connected to and disconnected from the fixed contactor so as to move forward and backward. The switchgear includes an arc extinction member including a surrounding portion which is slidably connected to the outer circumferential surface of the movable contactor halfway in a movement range from a close contact state to an open contact state and is formed so as to surround an arc space portion in a sealed manner, the surrounding portion being formed with a through hole through which the arc space communicates with the outside of the arc space.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: July 7, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsushi Nakada, Katsuhiko Horinouchi
  • Patent number: 8963037
    Abstract: In a vacuum circuit breaker corresponding to three-phase, which is configured by linearly arranging three pressure tanks respectively corresponding to one-phase, in which insulation gas is encapsulated, and a vacuum valve is installed, each pressure tank has a nearly longitudinal shape or a nearly square shape, viewed from a plane surface, and the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper lower direction, and the movable conductor is positioned lower than the vacuum valve, and keeps a sufficient insulation distance with respect to the movable-side connection conductor, and is neared to a position in one of diagonal directions or longitudinal directions of the pressure tank having a nearly square shape or nearly ellipsoidal shape, and moreover, the operation mechanism is arranged and configured at a position, which is lower than the vacuum valve.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: February 24, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsushi Nakada, Masahiro Arioka