Patents by Inventor Mituharu Tabata

Mituharu Tabata 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: 11894839
    Abstract: According to the present disclosure, a bidirectional switch circuit includes a first semiconductor device including a first backside electrode electrically connected to a first pattern and a first upper surface electrode, a second semiconductor device including a second backside electrode electrically connected to a second pattern and a second upper surface electrode, a first diode including a first cathode electrode electrically connected to the first pattern and a first anode electrode, a second diode including a second cathode electrode electrically connected to the first pattern and a second anode electrode, first wiring electrically connecting the first upper surface electrode and the second anode electrode and second wiring electrically connecting the second upper surface electrode and the first anode electrode, wherein the first upper surface electrode, the second upper surface electrode, the first anode electrode and the second anode electrode are electrically connected to each other.
    Type: Grant
    Filed: March 24, 2022
    Date of Patent: February 6, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Masuda, Mituharu Tabata
  • Publication number: 20230090703
    Abstract: According to the present disclosure, a bidirectional switch circuit includes a first semiconductor device including a first backside electrode electrically connected to a first pattern and a first upper surface electrode, a second semiconductor device including a second backside electrode electrically connected to a second pattern and a second upper surface electrode, a first diode including a first cathode electrode electrically connected to the first pattern and a first anode electrode, a second diode including a second cathode electrode electrically connected to the first pattern and a second anode electrode, first wiring electrically connecting the first upper surface electrode and the second anode electrode and second wiring electrically connecting the second upper surface electrode and the first anode electrode, wherein the first upper surface electrode, the second upper surface electrode, the first anode electrode and the second anode electrode are electrically connected to each other.
    Type: Application
    Filed: March 24, 2022
    Publication date: March 23, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Koichi MASUDA, Mituharu TABATA
  • Patent number: 11538802
    Abstract: In a RC-IGBT chip, an anode electrode film and an emitter electrode film are arranged with a distance therebetween. The anode electrode film and the emitter electrode film are electrically connected by a wiring conductor having an external impedance and an external impedance. The external impedance and the external impedance include the resistance of the wiring conductor and the inductance of the wiring conductor.
    Type: Grant
    Filed: April 13, 2020
    Date of Patent: December 27, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventor: Mituharu Tabata
  • Publication number: 20200388613
    Abstract: In a RC-IGBT chip, an anode electrode film and an emitter electrode film are arranged with a distance therebetween. The anode electrode film and the emitter electrode film are electrically connected by a wiring conductor having an external impedance and an external impedance. The external impedance and the external impedance include the resistance of the wiring conductor and the inductance of the wiring conductor.
    Type: Application
    Filed: April 13, 2020
    Publication date: December 10, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventor: Mituharu TABATA
  • Patent number: 10600765
    Abstract: A technique disclosed in the specification relates to a semiconductor device capable of minimizing restrictions on wire bonding activities and to a method for producing the semiconductor device. The semiconductor device of the present technique includes: a plurality of semiconductor chips disposed on a circuit pattern within a case defined by an outer frame in a plan view; and bonding wires for electrically connecting the semiconductor chips and the circuit pattern together. The semiconductor chips are arranged along a longer-side direction of the case. The bonding wires are strung along the longer-side direction of the case.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: March 24, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventor: Mituharu Tabata
  • Patent number: 10564048
    Abstract: According to the present invention, a semiconductor device includes a semiconductor chip, resistance of which changes in accordance with temperature, an external resistor connected in series with the semiconductor chip and a detector configured to detect, while a first voltage is applied between both ends of a series circuit formed by the semiconductor chip and the external resistor, a second voltage applied between both ends of the external resistor, wherein the detector calculates a temperature of the semiconductor chip from the second voltage.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: February 18, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tetsuo Yamashita, Tomohiro Hieda, Hiroki Muraoka, Mituharu Tabata, Koichi Masuda
  • Publication number: 20200011743
    Abstract: According to the present invention, a semiconductor device includes a semiconductor chip, resistance of which changes in accordance with temperature, an external resistor connected in series with the semiconductor chip and a detector configured to detect, while a first voltage is applied between both ends of a series circuit formed by the semiconductor chip and the external resistor, a second voltage applied between both ends of the external resistor, wherein the detector calculates a temperature of the semiconductor chip from the second voltage.
    Type: Application
    Filed: February 8, 2019
    Publication date: January 9, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tetsuo YAMASHITA, Tomohiro HIEDA, Hiroki MURAOKA, Mituharu TABATA, Koichi MASUDA
  • Patent number: 9991180
    Abstract: A semiconductor device includes: a resin case that houses a semiconductor element; a parallel plate that is disposed inside the resin case while being connected with the semiconductor element, the parallel plate including two flat plates parallel to each other with an insulating material therebetween; two electrodes that are each led out from two electrode lead-out portions in an upper end of the parallel plate and are disposed on an upper surface of the resin case at a predetermined interval; and a metal plate that stands erect on the main surface of the flat plate in a region at the predetermined interval between the two electrode lead-out portions.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: June 5, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideki Tsukamoto, Mituharu Tabata
  • Publication number: 20180005923
    Abstract: A semiconductor device includes: a circuit pattern, at least one or more wires joined thereto, an electrode terminal joining thereto, and a semiconductor element. The electrode terminal includes a horizontally extending portion extending along a main surface and connected to the wire, and a bent portion at which an extending direction of the electrode terminal is changed relative to the horizontally extending portion. Each of the wires has joint portions at which each of the wires and the circuit pattern are joined to each other. In a plan view, the joint portions are located on an outside of a portion where each of the wires and the electrode terminal overlap each other.
    Type: Application
    Filed: March 30, 2017
    Publication date: January 4, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasutaka SHIMIZU, Yoshitaka OTSUBO, Mituharu TABATA
  • Patent number: 9859195
    Abstract: A semiconductor device includes: a circuit pattern, at least one or more wires joined thereto, an electrode terminal joining thereto, and a semiconductor element. The electrode terminal includes a horizontally extending portion extending along a main surface and connected to the wire, and a bent portion at which an extending direction of the electrode terminal is changed relative to the horizontally extending portion. Each of the wires has joint portions at which each of the wires and the circuit pattern are joined to each other. In a plan view, the joint portions are located on an outside of a portion where each of the wires and the electrode terminal overlap each other.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: January 2, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasutaka Shimizu, Yoshitaka Otsubo, Mituharu Tabata
  • Patent number: 9721861
    Abstract: A semiconductor device includes a semiconductor element and a ceramic circuit substrate on which the semiconductor element is mounted. The ceramic circuit substrate includes a ceramic substrate having one surface and the other surface facing each other, a metal circuit board joined to the one surface of the ceramic substrate and electrically connected to the semiconductor element, and a metal heat-dissipation plate joined to the other surface of the ceramic substrate. The metal circuit board is greater in thickness than the metal heat-dissipation plate. A surface of the metal heat-dissipation plate on a side opposite to the ceramic substrate is larger in area than a surface of the metal circuit board on a side opposite to the ceramic substrate. Thereby, a semiconductor device capable of suppressing warpage of the ceramic substrate can be achieved.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: August 1, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshitaka Otsubo, Takuya Takahashi, Masaomi Miyazawa, Tetsuo Yamashita, Tomohiro Hieda, Mituharu Tabata
  • Publication number: 20170117256
    Abstract: A technique disclosed in the specification relates to a semiconductor device capable of minimizing restrictions on wire bonding activities and to a method for producing the semiconductor device. The semiconductor device of the present technique includes: a plurality of semiconductor chips disposed on a circuit pattern within a case defined by an outer frame in a plan view; and bonding wires for electrically connecting the semiconductor chips and the circuit pattern together. The semiconductor chips are arranged along a longer-side direction of the case. The bonding wires are strung along the longer-side direction of the case.
    Type: Application
    Filed: May 13, 2016
    Publication date: April 27, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventor: Mituharu TABATA
  • Patent number: 9627284
    Abstract: A semiconductor device includes: a resin case that houses a semiconductor element; a parallel plate that is disposed inside the resin case while being connected with the semiconductor element, the parallel plate including two flat plates parallel to each other with an insulating material therebetween; and two electrodes that are each led out from an upper end of the parallel plate and are disposed on an upper surface of the resin case at a predetermined interval. Upper end portions of the two flat plates of the parallel plate between two electrode lead-out portions are bent toward the outside being a direction in which the upper end portions of the two flat plates become more distant from each other, the two electrodes being led out from the corresponding two electrode lead-out portions.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: April 18, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideki Tsukamoto, Mituharu Tabata
  • Publication number: 20160307813
    Abstract: A semiconductor device includes: a resin case that houses a semiconductor element; a parallel plate that is disposed inside the resin case while being connected with the semiconductor element, the parallel plate including two flat plates parallel to each other with an insulating material therebetween; two electrodes that are each led out from two electrode lead-out portions in an upper end of the parallel plate and are disposed on an upper surface of the resin case at a predetermined interval; and a metal plate that stands erect on the main surface of the flat plate in a region at the predetermined interval between the two electrode lead-out portions.
    Type: Application
    Filed: December 9, 2015
    Publication date: October 20, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hideki TSUKAMOTO, Mituharu TABATA
  • Publication number: 20160284618
    Abstract: A semiconductor device includes: a resin case that houses a semiconductor element; a parallel plate that is disposed inside the resin case while being connected with the semiconductor element, the parallel plate including two flat plates parallel to each other with an insulating material therebetween; and two electrodes that are each led out from an upper end of the parallel plate and are disposed on an upper surface of the resin case at a predetermined interval. Upper end portions of the two flat plates of the parallel plate between two electrode lead-out portions are bent toward the outside being a direction in which the upper end portions of the two flat plates become more distant from each other, the two electrodes being led out from the corresponding two electrode lead-out portions.
    Type: Application
    Filed: October 29, 2015
    Publication date: September 29, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hideki TSUKAMOTO, Mituharu TABATA
  • Patent number: 9397014
    Abstract: An electrode includes an extending portion extending such that both ends thereof get into a first recessed portion and a second recessed portion provided in a first inner wall and a second inner wall, respectively, facing each other in a lateral direction of a case. The extent to which both the ends of the extending portion get into is set such that positions of both the ends thereof in a case where both the ends are narrowed toward a midpoint therebetween to reduce a length of the extending portion to 70% of the length of the extending portion exist between positions of the first and second inner walls in a case where the first and second inner walls are each narrowed toward a midpoint therebetween by 10% of the distance between the first and second inner walls.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: July 19, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaomi Miyazawa, Mituharu Tabata, Takuya Takahashi
  • Publication number: 20160095213
    Abstract: A semiconductor device includes a semiconductor element and a ceramic circuit substrate on which the semiconductor element is mounted. The ceramic circuit substrate includes a ceramic substrate having one surface and the other surface facing each other, a metal circuit board joined to the one surface of the ceramic substrate and electrically connected to the semiconductor element, and a metal heat-dissipation plate joined to the other surface of the ceramic substrate. The metal circuit board is greater in thickness than the metal heat-dissipation plate. A surface of the metal heat-dissipation plate on a side opposite to the ceramic substrate is larger in area than a surface of the metal circuit board on a side opposite to the ceramic substrate. Thereby, a semiconductor device capable of suppressing warpage of the ceramic substrate can be achieved.
    Type: Application
    Filed: April 15, 2015
    Publication date: March 31, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshitaka OTSUBO, Takuya TAKAHASHI, Masaomi MIYAZAWA, Tetsuo YAMASHITA, Tomohiro HIEDA, Mituharu TABATA
  • Publication number: 20150270186
    Abstract: An electrode includes an extending portion extending such that both ends thereof get into a first recessed portion and a second recessed portion provided in a first inner wall and a second inner wall, respectively, facing each other in a lateral direction of a case. The extent to which both the ends of the extending portion get into is set such that positions of both the ends thereof in a case where both the ends are narrowed toward a midpoint therebetween to reduce a length of the extending portion to 70% of the length of the extending portion exist between positions of the first and second inner walls in a case where the first and second inner walls are each narrowed toward a midpoint therebetween by 10% of the distance between the first and second inner walls.
    Type: Application
    Filed: December 10, 2014
    Publication date: September 24, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masaomi MIYAZAWA, Mituharu TABATA, Takuya TAKAHASHI
  • Patent number: 9094012
    Abstract: A driving circuit of the present invention drives a switching element connected to a main current circuit. The driving circuit includes a driving potion applying on/off-voltage to a gate of the switching element, a common inductor disposed in an interconnection part commonly connected to the driving circuit and a source side of the switching element in a loop formed of the main current circuit and the switching element, and a capacitor connected between the gate side and the source side on the driving portion side with respect to the common inductor.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: July 28, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mituharu Tabata, Yuji Miyazaki
  • Publication number: 20150061731
    Abstract: A driving circuit of the present invention drives a switching element connected to a main current circuit. The driving circuit includes a driving potion applying on/off-voltage to a gate of the switching element, a common inductor disposed in an interconnection part commonly connected to the driving circuit and a source side of the switching element in a loop formed of the main current circuit and the switching element, and a capacitor connected between the gate side and the source side on the driving portion side with respect to the common inductor.
    Type: Application
    Filed: April 14, 2014
    Publication date: March 5, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Mituharu TABATA, Yuji MIYAZAKI