Patents by Inventor Kazuhiko Otsuka

Kazuhiko Otsuka 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: 20200321903
    Abstract: Provided is a control device for an AC rotating electric machine, which includes: a temperature detection unit configured to detect a temperature of a protection unit provided in an object to be protected when a current is supplied from a power conversion circuit including a switching element to the AC rotating electric machine and output, as a detected temperature, one of the temperature and a temperature of the object to be protected that is estimated from the temperature; a temperature compensation unit configured to calculate, through use of the detected temperature output from the temperature detection unit, a compensated temperature equal to or higher than the detected temperature; and a torque limiting unit configured to limit, through use of the compensated temperature calculated by the temperature compensation unit, a torque command value input thereto.
    Type: Application
    Filed: February 19, 2020
    Publication date: October 8, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Tomohisa SHODA, Nozomu KAMIOKA, Ryosuke SHIGEMATSU, Kazuhiko OTSUKA
  • Patent number: 10748696
    Abstract: An electronic component includes a member with marking having at least one marking area to be processed digitally, as well as a member other than the member with marking. The marking allows for tracing the production history of individual electronic components.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: August 18, 2020
    Assignee: TAIYO YUDEN CO., LTD.
    Inventors: Yuji Shibuya, Kazuhiko Otsuka, Tetsuya Oga
  • Publication number: 20200203852
    Abstract: Circular loop antenna elements of each of a transmitting antenna and a receiving antenna have different perimeters of approximately integral multiples of a wavelength determined from a wireless communication frequency. The transmitting antenna and the receiving antenna include first circular loop antenna groups concentrically disposed on the same plane and second circular loop antenna groups including circular loop antenna elements of the same perimeter as that of a plurality of circular loop antenna elements of the first circular loop antenna group. An angular position of a terminal for connecting power supply units to circular loop antenna elements having the same perimeter is set to an angular position rotated by (2l+1)?/2mi (where l is any integer, and mi is a value of m1 to mN that are approximately integral multiples of a wavelength) in the first and second circular loop antenna groups.
    Type: Application
    Filed: May 1, 2018
    Publication date: June 25, 2020
    Applicant: THE UNIVERSITY OF ELECTRO-COMMUNICATIONS
    Inventors: Akira SAITOU, Hiroto OTSUKA, Kazuhiko HONJO, Ryo ISHIKAWA
  • Patent number: 10693390
    Abstract: In inverter control for supplying power to a motor, a power conversion device includes a temperature sensor for detecting a temperature of the inverter, a voltage sensor for detecting a voltage between terminals of a capacitor that smooths the voltage between terminals between the power source and the inverter, an inverter controller for controlling the inverter, a rotation speed sensor for detecting a rotation speed of the motor, an electric current sensor for detecting electric current supplied to the motor and a discharge determination instruction controller for giving an instruction for discharging electric charges accumulated in the capacitor, in which, control of reducing the rotation speed of the motor and discharge control of the capacitor are performed in accordance with the temperature of the inverter, the rotation speed of the motor and the electric current supplied to the motor.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: June 23, 2020
    Assignees: MITSUBISHI ELECTRIC CORPORATION, HONDA MOTOR CO., LTD.
    Inventors: Kazuki Takegawa, Satoshi Ishibashi, Kazuhiko Otsuka, Masaya Takahashi
  • Publication number: 20200144948
    Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.
    Type: Application
    Filed: June 6, 2017
    Publication date: May 7, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshimasa NISHIJIMA, Keiichi ENOKI, Masutaka WATANABE, Yasukazu MURATA, Shingo HARADA, Kazuhiko OTSUKA
  • Publication number: 20190261921
    Abstract: A biosignal detecting garment includes: a crop top type or brassiere type garment body; an under belt that have a fastening tool capable of adjusting a chest circumference size and that is disposed in a lower portion of the garment body; at least two electrodes formed of an electroconductive fiber; a connector for installing a measurement device configured to detect a biosignal; and a wiring portion configured to electrically connect the electrodes and the connector. The electrodes, the connector, and the wiring portion are installed in the under belt, the garment body has a length from an apex of a shoulder portion of the garment body to an upper portion of the under belt of 20.0 cm or more and 35.0 cm or less, and the under belt is formed in a bag shape with two pieces stacked.
    Type: Application
    Filed: September 5, 2017
    Publication date: August 29, 2019
    Inventors: Azuki Otsuka, Emiko Ishikawa, Yasuharu Murakami, Takako Ishihara, Kazuhiko Takagahara, Kouji Fujii
  • Publication number: 20190252794
    Abstract: A wireless communication apparatus includes a transmitting antenna; and a receiving antenna that receives a wireless signal transmitted from the transmitting antenna. Each of the transmitting antenna and the receiving antenna includes a plurality of circular loop antennas arranged concentrically in an identical plane, each of the plurality of circular loop antennas having a loop perimeter approximately equal to an integer multiple of one wavelength determined from a frequency in a wireless communication; and a plurality of feeding sections individually connected with the plurality of circular loop antennas. A central axis of the plurality of circular loop antennas of the transmitting antenna and a central axis of the plurality of circular loop antennas of the receiving antenna are arranged approximately on a straight line. Thus, a wireless signal is transmitted between the circular loop antennas having a loop perimeter of a transmitting side and a receiving side.
    Type: Application
    Filed: April 24, 2017
    Publication date: August 15, 2019
    Applicant: THE UNIVERSITY OF ELECTRO-COMMUNICATIONS
    Inventors: Akira SAITO, Kazuhiko HONJO, Ryo ISHIKAWA, Hiroto OTSUKA
  • Publication number: 20190173390
    Abstract: In inverter control for supplying power to a motor, a power conversion device includes a temperature sensor for detecting a temperature of the inverter, a voltage sensor for detecting a voltage between terminals of a capacitor that smooths the voltage between terminals between the power source and the inverter, an inverter controller for controlling the inverter, a rotation speed sensor for detecting a rotation speed of the motor, an electric current sensor for detecting electric current supplied to the motor and a discharge determination instruction controller for giving an instruction for discharging electric charges accumulated in the capacitor, in which, control of reducing the rotation speed of the motor and discharge control of the capacitor are performed in accordance with the temperature of the inverter, the rotation speed of the motor and the electric current supplied to the motor.
    Type: Application
    Filed: November 20, 2018
    Publication date: June 6, 2019
    Applicants: Mitsubishi Electric Corporation, Honda Motor Co., Ltd.
    Inventors: Kazuki TAKEGAWA, Satoshi ISHIBASHI, Kazuhiko OTSUKA, Masaya TAKAHASHI
  • Publication number: 20190168613
    Abstract: A power conversion device includes a backup power source as a power source for a discharge controller that discharges electric charges of a capacitor, and an abnormal state in the backup power source or loads is not capable of being dealt with when power is supplied to loads from the backup power source, which makes an output voltage of the backup power source be in an abnormal state. In order to solve the problem, when an abnormality occurs in the backup power source or in loads and the abnormality is detected in power supply from the backup power source, a place where the abnormality occurs is specified. When the specified place where the abnormality occurs is a load, power supply to the load is stopped, thereby preventing the output voltage of the backup power source from being abnormal even when an abnormality occurs in part of power supply destinations.
    Type: Application
    Filed: November 1, 2018
    Publication date: June 6, 2019
    Applicants: Mitsubishi Electric Corporation, Honda Motor Co., Ltd.
    Inventors: Kazuki TAKEGAWA, Satoshi ISHIBASHI, Kazuhiko OTSUKA, Masaya TAKAHASHI, Naotaka TSUJI
  • Patent number: 10312010
    Abstract: In an embodiment, a coil component 10 has a drum core 20 housed in a through hole 32 of a ring core 30, and two types of securing parts are provided in a gap G between an outer circumference of one flange part 24 of the drum core 20 and an inner circumference of the through hole 32. Terminal electrodes 50A, 50B connecting to ends 46A, 46B pulled out from a winding wire 40 wound around the drum core 20 are assembled to the ring core 30. Second securing parts 60A, 60B are arranged to opposite to each other with respect to a center C of the flange part 24, and first securing parts 62A, 62B are provided to cover an outer side of the second securing parts 60A, 60B. A hardness of the second securing part is higher than that of the first securing part.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: June 4, 2019
    Assignee: TAIYO YUDEN CO., LTD.
    Inventors: Tetsuya Oga, Kazuhiko Otsuka, Yuji Shibuya
  • Patent number: 10173530
    Abstract: When a motor rotation speed is equal to or greater than a predetermined rotation speed when an automobile collision is detected or when power stops, a motor rotation speed reduction control is carried out by an inverter control unit, and when an inter-terminal voltage of a secondary smoothing capacitor drops below a predetermined voltage during the motor rotation speed reduction control, the motor rotation speed reduction control is stopped, whereby induction voltage caused by motor rotation is applied to the secondary smoothing capacitor, the inter-terminal voltage of the secondary smoothing capacitor is raised, and the motor rotation speed reduction control is carried out while keeping the inter-terminal voltage of the secondary smoothing capacitor within an operating voltage range of the inverter control unit.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: January 8, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuki Takegawa, Koji Nakajima, Satoshi Ishibashi, Kazuhiko Otsuka
  • Patent number: 10090760
    Abstract: In a DC-DC voltage conversion device, overheat of a diode element connected in anti-parallel with a semiconductor switching element is a problem, and in order to resolve this, a temperature of a semiconductor switching element of a main conversion circuit is detected, a temperature of a diode element connected in parallel with the semiconductor switching element is calculated using a correction calculation of the detected semiconductor switching element temperature value in accordance with a step-up ratio of the DC-DC voltage conversion device, and diode element overheat protection is carried out in accordance with the calculated temperature value.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: October 2, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaru Kobayashi, Matahiko Ikeda, Nobuhiro Kihara, Kazuhiko Otsuka, Junichi Abe
  • Patent number: 10014776
    Abstract: A power conversion device provided with a DC power source, a voltage boost converter, an inverter, a primary smoothing capacitor, a secondary smoothing capacitor, an intermediate capacitor provided in the voltage boost converter and three voltage sensors which measure the voltages of the capacitors, further including an abnormality diagnosis controller which makes a diagnosis of the presence/absence of an abnormality in the detection characteristics of the voltage sensors, on the basis of the state of transition of the detection results of the voltage sensors which are monitored during a discharge operation by the respective capacitors.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: July 3, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaru Kobayashi, Shinsuke Idenoue, Satoshi Ishii, Kazuhiko Otsuka, Junichi Abe
  • Publication number: 20180178656
    Abstract: When a motor rotation speed is equal to or greater than a predetermined rotation speed when an automobile collision is detected or when power stops, a motor rotation speed reduction control is carried out by an inverter control unit, and when an inter-terminal voltage of a secondary smoothing capacitor drops below a predetermined voltage during the motor rotation speed reduction control, the motor rotation speed reduction control is stopped, whereby induction voltage caused by motor rotation is applied to the secondary smoothing capacitor, the inter-terminal voltage of the secondary smoothing capacitor is raised, and the motor rotation speed reduction control is carried out while keeping the inter-terminal voltage of the secondary smoothing capacitor within an operating voltage range of the inverter control unit.
    Type: Application
    Filed: October 10, 2017
    Publication date: June 28, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazuki TAKEGAWA, Koji NAKAJIMA, Satoshi ISHIBASHI, Kazuhiko OTSUKA
  • Publication number: 20180096775
    Abstract: An electronic component includes a member with marking having at least one marking area to be processed digitally, as well as a member other than the member with marking. The marking allows for tracing the production history of individual electronic components.
    Type: Application
    Filed: September 22, 2017
    Publication date: April 5, 2018
    Inventors: Yuji SHIBUYA, Kazuhiko OTSUKA, Tetsuya OGA
  • Publication number: 20180026539
    Abstract: A power conversion device provided with a DC power source, a voltage boost converter, an inverter, a primary smoothing capacitor, a secondary smoothing capacitor, an intermediate capacitor provided in the voltage boost converter and three voltage sensors which measure the voltages of the capacitors, further including an abnormality diagnosis controller which makes a diagnosis of the presence/absence of an abnormality in the detection characteristics of the voltage sensors, on the basis of the state of transition of the detection results of the voltage sensors which are monitored during a discharge operation by the respective capacitors.
    Type: Application
    Filed: March 3, 2017
    Publication date: January 25, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masaru KOBAYASHI, Shinsuke IDENOUE, Satoshi ISHII, Kazuhiko OTSUKA, Junichi ABE
  • Publication number: 20170294838
    Abstract: In a DC-DC voltage conversion device, overheat of a diode element connected in anti-parallel with a semiconductor switching element is a problem, and in order to resolve this, a temperature of a semiconductor switching element of a main conversion circuit is detected, a temperature of a diode element connected in parallel with the semiconductor switching element is calculated using a correction calculation of the detected semiconductor switching element temperature value in accordance with a step-up ratio of the DC-DC voltage conversion device, and diode element overheat protection is carried out in accordance with the calculated temperature value.
    Type: Application
    Filed: February 14, 2017
    Publication date: October 12, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masaru KOBAYASHI, Matahiko IKEDA, Nobuhiro KIHARA, Kazuhiko OTSUKA, Junichi ABE
  • Publication number: 20170287614
    Abstract: In an embodiment, a coil component 10 has a drum core 20 housed in a through hole 32 of a ring core 30, and two types of securing parts are provided in a gap G between an outer circumference of one flange part 24 of the drum core 20 and an inner circumference of the through hole 32. Terminal electrodes 50A, 50B connecting to ends 46A, 46B pulled out from a winding wire 40 wound around the drum core 20 are assembled to the ring core 30. Second securing parts 60A, 60B are arranged to opposite to each other with respect to a center C of the flange part 24, and first securing parts 62A, 62B are provided to cover an outer side of the second securing parts 60A, 60B. A hardness of the second securing part is higher than that of the first securing part.
    Type: Application
    Filed: March 27, 2017
    Publication date: October 5, 2017
    Inventors: Tetsuya OGA, Kazuhiko OTSUKA, Yuji SHIBUYA
  • Patent number: 9625292
    Abstract: An environment sensor is mounted on a second surface of a circuit board that does not have a wire bonding pad, and is arranged in a measuring chamber that is disposed in a circuit board receiving portion. The measuring chamber has a communication port for communication with a main passage. According to this configuration, process addition attributable to integration between a flow rate measurement device and the environment sensor is not required. The environment sensor does not affect air flow in a bypass passage, and thus detection accuracy of a flow rate detection element that is arranged in the bypass passage does not decline.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: April 18, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichiro Hidaka, Yuji Ariyoshi, Masahiro Kawai, Kazuhiko Otsuka, Naoyuki Kishikawa, Naoki Morinaga
  • Patent number: 9400198
    Abstract: In a flow sensor, an upstream heating element and a downstream heating element are disposed, respectively, upstream and downstream in a flow direction of a fluid so as to undergo mutual thermal interference. By controlling heating currents flown through the respective heating elements, an average temperature control portion maintains an average temperature of the two heating elements at a temperature predetermined degrees higher than a temperature of the fluid detected by a fluid temperature detection portion while a voltage ratio control portion performs control so that a temperature difference or a ratio of applied voltages between the two heating elements takes a predetermined value. A detection signal corresponding to a flow direction of the fluid is obtained from a state of the control on the heating currents and whether a flow direction of the fluid is forward or backward is determined.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: July 26, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuhiko Otsuka, Yuji Ariyoshi, Masahiro Kawai, Shinichiro Hidaka