Patents by Inventor Kentaro Inomata

Kentaro Inomata 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: 20200280258
    Abstract: A device includes: a first power conversion circuitry configured to convert primary-side power into secondary-side power; and a control circuitry configured to: generate a command value associated with the secondary-side power; calculate a limited command value by modifying the command value so that the command value is equal to or less than a secondary-side limit, wherein the first power conversion circuitry is controlled based on the limited command value; transmit the limited command value to a second power conversion device comprising a second power conversion circuitry connected in parallel to the first power conversion circuitry; receive, from the second power conversion device, information indicating an adjustment value, wherein the adjustment value is added to the limited command value for controlling the second power conversion circuitry; and modify the secondary-side limit based on a difference between a primary-side limit associated with the primary-side power and the adjustment value.
    Type: Application
    Filed: February 20, 2020
    Publication date: September 3, 2020
    Inventors: Akira YAMAZAKI, Kentaro INOMATA, Masato HIGUCHI
  • Publication number: 20200200347
    Abstract: A light emitting device includes a laser diode that emits a blue light, and a wavelength conversion part that absorbs a part of light emitted from the laser diode and converts a wavelength thereof. The wavelength conversion part includes a YAG-based single crystal phosphor. Irradiance of light emitted from the laser diode and irradiated on the wavelength conversion part is not less than 80 W/mm2.
    Type: Application
    Filed: December 27, 2016
    Publication date: June 25, 2020
    Applicants: TAMURA CORPORATION, KOHA CO., LTD.
    Inventors: Mikihiko UWANI, Akira ITO, Hiroyuki SAWANO, Kentaro TONE, Hiroaki SANO, Daisuke INOMATA, Kazuyuki IIZUKA
  • Publication number: 20200144930
    Abstract: A power conversion apparatus connectable in parallel to a second power conversion apparatus includes circuitry that generates a carrier wave, generates a pulse signal synchronized with the carrier wave, generates power that is based on a width of the pulse signal, obtains a monitor value corresponding to a circulating current circulating between the power conversion apparatus and the second power conversion apparatus, and based on the monitor value obtained while the power conversion circuitry is generating driving power, changes a period of the carrier wave to decrease the circulating current.
    Type: Application
    Filed: November 1, 2019
    Publication date: May 7, 2020
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro Inomata, Akira Yamazaki, Masato Higuchi, Hidenori Hara
  • Patent number: 9923456
    Abstract: A matrix convertor includes a power convertor and a controller. The power convertor is disposed between a power system and a rotating electric machine, and includes a plurality of bidirectional switches. The controller is configured to control an exciting current flowing from the power convertor to the rotating electric machine so as to control a power factor on a side of the power system.
    Type: Grant
    Filed: July 3, 2015
    Date of Patent: March 20, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Wataru Yoshinaga, Takashi Tanaka, Kentaro Inomata, Kotaro Takeda, Takuya Naka
  • Patent number: 9450501
    Abstract: A matrix converter includes a power converter and a controller. The power converter includes bidirectional switches each having a controllable conducting direction. The bidirectional switches are disposed between input terminals and output terminals. The input terminals are respectively coupled to phases of an AC power source. The output terminals are respectively coupled to phases of a load. The controller controls the bidirectional switches. A first commutation controller performs commutation control when the conducting direction is unidirectional. A second commutation controller performs the commutation control when the conducting direction is bidirectional. A selector selects between the first commutation controller and the second commutation controller to perform the commutation control based on a state of an output current from the power converter.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: September 20, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Kentaro Inomata
  • Publication number: 20160054751
    Abstract: A matrix converter includes a power converter and a commutator. The power converter includes a plurality of bidirectional switches provided between respective phases of an AC power source and respective phases of a load. The commutator is configured to perform commutation control by which input phases connected to output phases are switched using the bidirectional switches. The commutator includes a selector configured to select one commutation pattern from a plurality of commutation patterns based on at least one of a state of phase voltages of the AC power source and a state of phase currents of the load, and a commutation controller configured to perform commutation control by controlling the bidirectional switches pursuant to the commutation pattern selected by the selector to switch a connection state of the AC power source and the load.
    Type: Application
    Filed: August 24, 2015
    Publication date: February 25, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Kentaro INOMATA
  • Publication number: 20160056706
    Abstract: A matrix converter includes a selector, a commutation controller, a determinator, and a condition changer. The selector selects one commutation pattern from plurality of commutation patterns based on a state of a phase voltage of a AC power source and a state of a phase current of a load. The commutation controller performs commutation control by controlling bidirectional switches pursuant to the commutation pattern selected by the selector to switch a connection state of the AC power source and the load. The determinator determines a power loss generated by the commutation control in the bidirectional switches. The condition changer changes the commutation patterns which become a selection target of the selector or a selection condition of the commutation patterns which become the selection target of the selector, based on the power loss determined by the determinator.
    Type: Application
    Filed: August 21, 2015
    Publication date: February 25, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Kentaro INOMATA
  • Publication number: 20160006345
    Abstract: A matrix convertor includes a power convertor and a controller. The power convertor is disposed between a power system and a rotating electric machine, and includes a plurality of bidirectional switches. The controller is configured to control an exciting current flowing from the power convertor to the rotating electric machine so as to control a power factor on a side of the power system.
    Type: Application
    Filed: July 3, 2015
    Publication date: January 7, 2016
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Wataru YOSHINAGA, Takashi TANAKA, Kentaro INOMATA, Kotaro TAKEDA, Takuya NAKA
  • Patent number: 9219424
    Abstract: A matrix converter according to an embodiment includes a voltage command corrector and a drive signal generator. The voltage command corrector corrects the magnitude of an output voltage command on the basis of amplitude variations of an input current from an AC power supply to a power converter, the amplitude variations being caused by a ripple component of the input current. The drive signal generator generates drive signals that turn ON/OFF a plurality of bidirectional switches on the basis of the output voltage command corrected by the voltage command corrector.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: December 22, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro Inomata, Hidenori Hara, Takahiro Uchino
  • Publication number: 20150295506
    Abstract: A power converting apparatus includes: a power converter provided between each phase of an AC power source and each phase of a load; a controller for controlling the power converter to perform a power conversion control between the AC power source and the load; and a filter provided between the AC power source and the power converter. The controller has: an oscillation component detector to detect an oscillation component of an input voltage of the power converter or an oscillation component included in a current flowing through the filter; and an output voltage controller to control an output voltage of the power converter to suppress a resonance of the filter based on the oscillation component.
    Type: Application
    Filed: April 8, 2015
    Publication date: October 15, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro INOMATA, Eiji WATANABE, Takashi TANAKA
  • Publication number: 20150280597
    Abstract: A power converting apparatus includes a power converter, a controller, and a filter. Further, the controller includes a command generator, an estimator, a voltage error calculator, and an output voltage controller. The command generator is configured to generate an output voltage command. The estimator is configured to estimate the output voltage based on an output current of the power converter. The voltage error calculator is configured to calculate a voltage difference between the output voltage command and the estimated output voltage. The output voltage controller is configured to control the output voltage to suppress a resonance of the filter based on the voltage difference.
    Type: Application
    Filed: March 24, 2015
    Publication date: October 1, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yoshiyasu TAKASE, Shinya MORIMOTO, Kentaro INOMATA, Takashi TANAKA
  • Patent number: 9112414
    Abstract: Provided is a matrix converter including a power converter, a commutation controller, and a compensator. The power converter includes a plurality of bidirectional switches. The commutation controller performs one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when an input terminal to be connected to an output terminal is switched by on/off control of the bidirectional switches. The compensator compensates for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on a potential difference before and after the switching of the input terminal to be connected to the output terminal, an output current of the output terminal, and capacitance between input and output terminals of unidirectional switches.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: August 18, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro Inomata, Shinya Morimoto, Mamoru Takaki, Yoshiyasu Takase
  • Publication number: 20150188443
    Abstract: A matrix converter according to embodiments includes a power conversion unit and drive controllers. The power conversion unit includes a plurality of bidirectional switches for connecting each phase of an alternating-current (AC) power supply with each phase of a rotary electric machine. When the voltage of the AC power supply is a predetermined value or less, the drive controllers control the power conversion unit to supply reactive power from the power conversion unit to the AC power supply and to control the torque of the rotary electric machine.
    Type: Application
    Filed: December 19, 2014
    Publication date: July 2, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kotaro TAKEDA, Wataru YOSHINAGA, Takashi TANAKA, Takuya NAKA, Kentaro INOMATA
  • Publication number: 20150085552
    Abstract: A matrix converter includes a power converter and a controller. The power converter includes bidirectional switches each having a conducting direction controllable by switching elements. The bidirectional switches are disposed between input terminals coupled to phases of an AC power source and output terminals coupled to phases of a load. A first commutation controller performs commutation control based on a first commutation. A second commutation controller performs the commutation control based on a second commutation. A selector selects between the first and second commutation controllers and to perform the commutation control based on a vector of an output current or an output voltage from the power converter or a vector of an input voltage or an input current from the AC power source to the power converter.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 26, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro INOMATA, Shinya MORIMOTO
  • Publication number: 20150085551
    Abstract: A matrix converter includes a power converter and a controller. The power converter includes bidirectional switches each having a controllable conducting direction. The bidirectional switches are disposed between input terminals and output terminals. The input terminals are respectively coupled to phases of an AC power source. The output terminals are respectively coupled to phases of a load. The controller controls the bidirectional switches. A first commutation controller performs commutation control when the conducting direction is unidirectional. A second commutation controller performs the commutation control when the conducting direction is bidirectional. A selector selects between the first commutation controller and the second commutation controller to perform the commutation control based on a state of an output current from the power converter.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 26, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Kentaro INOMATA
  • Publication number: 20150003136
    Abstract: A matrix converter according to an embodiment includes a voltage command corrector and a drive signal generator. The voltage command corrector corrects the magnitude of an output voltage command on the basis of amplitude variations of an input current from an AC power supply to a power converter, the amplitude variations being caused by a ripple component of the input current. The drive signal generator generates drive signals that turn ON/OFF a plurality of bidirectional switches on the basis of the output voltage command corrected by the voltage command corrector.
    Type: Application
    Filed: June 12, 2014
    Publication date: January 1, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro INOMATA, Hidenori HARA, Takahiro UCHINO
  • Publication number: 20140254230
    Abstract: Provided is a matrix converter including a power converter, a commutation controller, and a compensator. The power converter includes a plurality of bidirectional switches. The commutation controller performs one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when an input terminal to be connected to an output terminal is switched by on/off control of the bidirectional switches. The compensator compensates for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on a potential difference before and after the switching of the input terminal to be connected to the output terminal, an output current of the output terminal, and capacitance between input and output terminals of unidirectional switches.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 11, 2014
    Applicant: Kabushiki Kaisha Yaskawa Denki
    Inventors: Kentaro INOMATA, Shinya MORIMOTO, Mamoru TAKAKI, Yoshiyasu TAKASE
  • Publication number: 20140246939
    Abstract: The motor includes: a rotor that includes a rotor core provided with a plurality of permanent magnets in a circumferential direction; and a stator that includes a stator core on which multi-phase stator coils are wound and is arranged facing the rotor with a predetermined air gap therebetween. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes stepwise in the circumferential direction. The stator has a structure in which the distribution pattern of a magnetic field generated by the stator coils with one phase or with a combination of the phases has uniqueness over a whole circumference.
    Type: Application
    Filed: May 13, 2014
    Publication date: September 4, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sohji MURAKAMI, Motomichi OHTO, Kentaro INOMATA, Kozo IDE, Shinya MORIMOTO
  • Publication number: 20140246940
    Abstract: A motor includes a rotor including a rotor core provided with a plurality of permanent magnets in the circumferential direction and a stator including a stator core on which multi-phase stator coils are wound. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes in the circumferential direction, and the stator has a structure in which first and second stator coils of the stator coils are wound on the stator core for each phase in such a manner that passage of current is optionally switched, and when the passage of current is switched to the second stator coil, the distribution pattern of a magnetic field formed on the inner circumferential side by the stator has uniqueness over the whole circumference.
    Type: Application
    Filed: May 12, 2014
    Publication date: September 4, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sohji MURAKAMI, Motomichi OHTO, Kentaro INOMATA, Shinya MORIMOTO, Kozo IDE
  • Publication number: 20140176100
    Abstract: A matrix converter according to one aspect of an embodiment includes a plurality of bidirectional switches and a controller. The bidirectional switches connect each phase of an alternating current (AC) power supply with each phase of the rotary electric machine. The controller performs power conversion control between the AC power supply and the rotary electric machine by controlling a plurality of unidirectional switching elements constituting the bidirectional switches individually. The controller performs switching control for advancing the timing at which the unidirectional switching elements constituting the bidirectional switches are switched ON from that in 120-degree conduction control, and for extending a period for which the unidirectional switching elements are kept ON from that in the 120-degree conduction control.
    Type: Application
    Filed: December 16, 2013
    Publication date: June 26, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Hidenori HARA, Kentaro INOMATA, Katsutoshi YAMANAKA, Shinya MORIMOTO, Kotaro TAKEDA